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esp-idf/components/mdns/mdns.c
David Cermak 5e19b9c951 esp-netif: Make dependency on esp-eth optional 
* esp-netif to optionally depend on esp-eth (only for l2tap config)
* esp_eth.h now includes the original ethernet header and the
ethernet-netif glue layer
* Updated examples and test to explicitely use esp-eth dependency if
needed
2022-06-09 07:55:40 +00:00

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/*
* SPDX-FileCopyrightText: 2015-2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <string.h>
#include <sys/param.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/queue.h"
#include "freertos/semphr.h"
#include "esp_log.h"
#include "esp_event.h"
#include "mdns.h"
#include "mdns_private.h"
#include "mdns_networking.h"
#include "esp_log.h"
#include "esp_random.h"
#if CONFIG_ETH_ENABLED
#include "esp_eth.h"
#endif
#ifdef MDNS_ENABLE_DEBUG
void mdns_debug_packet(const uint8_t * data, size_t len);
#endif
#ifndef ARRAY_SIZE
#define ARRAY_SIZE(array) (sizeof(array) / sizeof((array)[0]))
#endif
// Internal size of IPv6 address is defined here as size of AAAA record in mdns packet
// since the ip6_addr_t is defined in lwip and depends on using IPv6 zones
#define _MDNS_SIZEOF_IP6_ADDR (MDNS_ANSWER_AAAA_SIZE)
static const char * MDNS_DEFAULT_DOMAIN = "local";
static const char * MDNS_SUB_STR = "_sub";
mdns_server_t * _mdns_server = NULL;
static mdns_host_item_t * _mdns_host_list = NULL;
static mdns_host_item_t _mdns_self_host;
static const char *TAG = "MDNS";
static volatile TaskHandle_t _mdns_service_task_handle = NULL;
static SemaphoreHandle_t _mdns_service_semaphore = NULL;
static void _mdns_search_finish_done(void);
static mdns_search_once_t * _mdns_search_find_from(mdns_search_once_t * search, mdns_name_t * name, uint16_t type, mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol);
static void _mdns_search_result_add_ip(mdns_search_once_t * search, const char * hostname, esp_ip_addr_t * ip,
mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol, uint32_t ttl);
static void _mdns_search_result_add_srv(mdns_search_once_t *search, const char *hostname, uint16_t port,
mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol, uint32_t ttl);
static void _mdns_search_result_add_txt(mdns_search_once_t *search, mdns_txt_item_t *txt, uint8_t *txt_value_len,
size_t txt_count, mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol,
uint32_t ttl);
static mdns_result_t * _mdns_search_result_add_ptr(mdns_search_once_t * search, const char * instance,
const char * service_type, const char * proto, mdns_if_t tcpip_if,
mdns_ip_protocol_t ip_protocol, uint32_t ttl);
static bool _mdns_append_host_list_in_services(mdns_out_answer_t ** destination, mdns_srv_item_t * services[], size_t services_len, bool flush, bool bye);
static bool _mdns_append_host_list(mdns_out_answer_t ** destination, bool flush, bool bye);
static void _mdns_remap_self_service_hostname(const char *old_hostname, const char *new_hostname);
static esp_err_t mdns_post_custom_action_tcpip_if(mdns_if_t mdns_if, mdns_event_actions_t event_action);
typedef enum {
MDNS_IF_STA = 0,
MDNS_IF_AP = 1,
MDNS_IF_ETH = 2,
} mdns_predef_if_t;
typedef struct mdns_interfaces mdns_interfaces_t;
struct mdns_interfaces {
const bool predefined;
esp_netif_t * netif;
const mdns_predef_if_t predef_if;
mdns_if_t duplicate;
};
/*
* @brief Internal collection of mdns supported interfaces
*
*/
static mdns_interfaces_t s_esp_netifs[MDNS_MAX_INTERFACES] = {
#if CONFIG_MDNS_PREDEF_NETIF_STA
{ .predefined = true, .netif = NULL, .predef_if = MDNS_IF_STA, .duplicate = MDNS_MAX_INTERFACES },
#endif
#if CONFIG_MDNS_PREDEF_NETIF_AP
{ .predefined = true, .netif = NULL, .predef_if = MDNS_IF_AP, .duplicate = MDNS_MAX_INTERFACES },
#endif
#if CONFIG_MDNS_PREDEF_NETIF_ETH
{ .predefined = true, .netif = NULL, .predef_if = MDNS_IF_ETH, .duplicate = MDNS_MAX_INTERFACES },
#endif
};
/**
* @brief Convert Predefined interface to the netif id from the internal netif list
* @param predef_if Predefined interface enum
* @return Ordinal number of internal list of mdns network interface.
* Returns MDNS_MAX_INTERFACES if the predefined interface wasn't found in the list
*/
static mdns_if_t mdns_if_from_preset_if(mdns_predef_if_t predef_if)
{
for (int i=0; i<MDNS_MAX_INTERFACES; ++i) {
if (s_esp_netifs[i].predefined && s_esp_netifs[i].predef_if == predef_if) {
return i;
}
}
return MDNS_MAX_INTERFACES;
}
/**
* @brief Convert Predefined interface to esp-netif handle
* @param predef_if Predefined interface enum
* @return esp_netif pointer from system list of network interfaces
*/
static inline esp_netif_t *esp_netif_from_preset_if(mdns_predef_if_t predef_if)
{
switch (predef_if) {
case MDNS_IF_STA:
return esp_netif_get_handle_from_ifkey("WIFI_STA_DEF");
case MDNS_IF_AP:
return esp_netif_get_handle_from_ifkey("WIFI_AP_DEF");
#if CONFIG_ETH_ENABLED
case MDNS_IF_ETH:
return esp_netif_get_handle_from_ifkey("ETH_DEF");
#endif
default:
return NULL;
}
}
/**
* @brief Gets the actual esp_netif pointer from the internal network interface list
*
* The supplied ordinal number could
* - point to a predef netif -> "STA", "AP", "ETH"
* - if no entry in the list (NULL) -> check if the system added this netif
* - point to a custom netif -> just return the entry in the list
* - users is responsible for the lifetime of this netif (to be valid between mdns-init -> deinit)
*
* @param tcpip_if Ordinal number of the interface
* @return Pointer ot the esp_netif object if the interface is available, NULL otherwise
*/
esp_netif_t *_mdns_get_esp_netif(mdns_if_t tcpip_if)
{
if (tcpip_if < MDNS_MAX_INTERFACES) {
if (s_esp_netifs[tcpip_if].netif == NULL && s_esp_netifs[tcpip_if].predefined) {
// If the local copy is NULL and this netif is predefined -> we can find it in the global netif list
s_esp_netifs[tcpip_if].netif = esp_netif_from_preset_if(s_esp_netifs[tcpip_if].predef_if);
// failing to find it means that the netif is *not* available -> return NULL
}
return s_esp_netifs[tcpip_if].netif;
}
return NULL;
}
/*
* @brief Clean internal mdns interface's pointer
*/
static inline void _mdns_clean_netif_ptr(mdns_if_t tcpip_if) {
if (tcpip_if < MDNS_MAX_INTERFACES) {
s_esp_netifs[tcpip_if].netif = NULL;
}
}
/*
* @brief Convert esp-netif handle to mdns if
*/
static mdns_if_t _mdns_get_if_from_esp_netif(esp_netif_t *esp_netif)
{
for (int i=0; i<MDNS_MAX_INTERFACES; ++i) {
if (esp_netif == s_esp_netifs[i].netif) {
return i;
}
}
return MDNS_MAX_INTERFACES;
}
static inline bool _str_null_or_empty(const char * str){
return (str == NULL || *str == 0);
}
/*
* @brief Appends/increments a number to name/instance in case of collision
* */
static char * _mdns_mangle_name(char* in) {
char *p = strrchr(in, '-');
int suffix = 0;
if (p == NULL) {
//No - in ``in``
suffix = 2;
} else {
char *endp = NULL;
suffix = strtol(p + 1, &endp, 10);
if (*endp != 0) {
//suffix is not numerical
suffix = 2;
p = NULL; //so we append -suffix to the entire string
}
}
char *ret;
if (p == NULL) {
//need to add -2 to string
ret = malloc(strlen(in) + 3);
if (ret == NULL) {
HOOK_MALLOC_FAILED;
return NULL;
}
sprintf(ret, "%s-2", in);
} else {
ret = malloc(strlen(in) + 2); //one extra byte in case 9-10 or 99-100 etc
if (ret == NULL) {
HOOK_MALLOC_FAILED;
return NULL;
}
strcpy(ret, in);
int baseLen = p - in; //length of 'bla' in 'bla-123'
//overwrite suffix with new suffix
sprintf(ret + baseLen, "-%d", suffix + 1);
}
return ret;
}
static bool _mdns_service_match(const mdns_service_t * srv, const char * service, const char * proto,
const char * hostname)
{
if (!service || !proto) {
return false;
}
return !strcasecmp(srv->service, service) && !strcasecmp(srv->proto, proto) &&
(_str_null_or_empty(hostname) || !strcasecmp(srv->hostname, hostname));
}
/**
* @brief finds service from given service type
* @param server the server
* @param service service type to match
* @param proto proto to match
* @param hostname hostname of the service (if non-null)
*
* @return the service item if found or NULL on error
*/
static mdns_srv_item_t * _mdns_get_service_item(const char * service, const char * proto, const char * hostname)
{
mdns_srv_item_t * s = _mdns_server->services;
while (s) {
if (_mdns_service_match(s->service, service, proto, hostname)) {
return s;
}
s = s->next;
}
return NULL;
}
static mdns_srv_item_t * _mdns_get_service_item_subtype(const char *subtype, const char * service, const char * proto)
{
mdns_srv_item_t * s = _mdns_server->services;
while (s) {
if (_mdns_service_match(s->service, service, proto, NULL)) {
mdns_subtype_t *subtype_item = s->service->subtype;
while(subtype_item) {
if (!strcasecmp(subtype_item->subtype, subtype)) {
return s;
}
subtype_item = subtype_item->next;
}
}
s = s->next;
}
return NULL;
}
static mdns_host_item_t * mdns_get_host_item(const char * hostname)
{
if (hostname == NULL || strcasecmp(hostname, _mdns_server->hostname) == 0) {
return &_mdns_self_host;
}
mdns_host_item_t * host = _mdns_host_list;
while (host != NULL) {
if (strcasecmp(host->hostname, hostname) == 0) {
return host;
}
host = host->next;
}
return NULL;
}
static bool _mdns_can_add_more_services(void)
{
mdns_srv_item_t * s = _mdns_server->services;
uint16_t service_num = 0;
while (s) {
service_num ++;
s = s->next;
if (service_num >= MDNS_MAX_SERVICES) {
return false;
}
}
return true;
}
esp_err_t _mdns_send_rx_action(mdns_rx_packet_t * packet)
{
mdns_action_t * action = NULL;
action = (mdns_action_t *)malloc(sizeof(mdns_action_t));
if (!action) {
HOOK_MALLOC_FAILED;
return ESP_ERR_NO_MEM;
}
action->type = ACTION_RX_HANDLE;
action->data.rx_handle.packet = packet;
if (xQueueSend(_mdns_server->action_queue, &action, (TickType_t)0) != pdPASS) {
free(action);
return ESP_ERR_NO_MEM;
}
return ESP_OK;
}
static const char *_mdns_get_default_instance_name(void)
{
if (_mdns_server && !_str_null_or_empty(_mdns_server->instance)) {
return _mdns_server->instance;
}
if (_mdns_server && !_str_null_or_empty(_mdns_server->hostname)) {
return _mdns_server->hostname;
}
return NULL;
}
/**
* @brief Get the service name of a service
*/
static const char * _mdns_get_service_instance_name(const mdns_service_t * service)
{
if (service && !_str_null_or_empty(service->instance)) {
return service->instance;
}
return _mdns_get_default_instance_name();
}
static bool _mdns_instance_name_match(const char *lhs, const char *rhs)
{
if (lhs == NULL) {
lhs = _mdns_get_default_instance_name();
}
if (rhs == NULL) {
rhs = _mdns_get_default_instance_name();
}
return !strcasecmp(lhs, rhs);
}
static bool _mdns_service_match_instance(const mdns_service_t *srv, const char *instance, const char *service,
const char *proto, const char *hostname)
{
// service and proto must be supplied, if not this instance won't match
if (!service || !proto) {
return false;
}
// instance==NULL -> _mdns_instance_name_match() will check the default instance
// hostname==NULL -> matches if instance, service and proto matches
return !strcasecmp(srv->service, service) && _mdns_instance_name_match(srv->instance, instance) &&
!strcasecmp(srv->proto, proto) && (_str_null_or_empty(hostname) || !strcasecmp(srv->hostname, hostname));
}
static mdns_srv_item_t *_mdns_get_service_item_instance(const char *instance, const char *service, const char *proto,
const char *hostname)
{
mdns_srv_item_t *s = _mdns_server->services;
while (s) {
if (instance) {
if (_mdns_service_match_instance(s->service, instance, service, proto, hostname)) {
return s;
}
} else {
if (_mdns_service_match(s->service, service, proto, hostname)) {
return s;
}
}
s = s->next;
}
return NULL;
}
/**
* @brief reads MDNS FQDN into mdns_name_t structure
* FQDN is in format: [hostname.|[instance.]_service._proto.]local.
*
* @param packet MDNS packet
* @param start Starting point of FQDN
* @param name mdns_name_t structure to populate
* @param buf temporary char buffer
*
* @return the address after the parsed FQDN in the packet or NULL on error
*/
static const uint8_t * _mdns_read_fqdn(const uint8_t * packet, const uint8_t * start, mdns_name_t * name, char * buf, size_t packet_len)
{
size_t index = 0;
const uint8_t * packet_end = packet + packet_len;
while (start + index < packet_end && start[index]) {
if (name->parts == 4) {
name->invalid = true;
}
uint8_t len = start[index++];
if (len < 0xC0) {
if (len > 63) {
//length can not be more than 63
return NULL;
}
uint8_t i;
for (i=0; i<len; i++) {
if (start + index >= packet_end) {
return NULL;
}
buf[i] = start[index++];
}
buf[len] = '\0';
if (name->parts == 1 && buf[0] != '_'
&& (strcasecmp(buf, MDNS_DEFAULT_DOMAIN) != 0)
&& (strcasecmp(buf, "arpa") != 0)
&& (strcasecmp(buf, "ip6") != 0)
&& (strcasecmp(buf, "in-addr") != 0)) {
strlcat(name->host, ".", sizeof(name->host));
strlcat(name->host, buf, sizeof(name->host));
} else if (strcasecmp(buf, MDNS_SUB_STR) == 0) {
name->sub = 1;
} else if (!name->invalid) {
char* mdns_name_ptrs[]={name->host, name->service, name->proto, name->domain};
memcpy(mdns_name_ptrs[name->parts++], buf, len+1);
}
} else {
size_t address = (((uint16_t)len & 0x3F) << 8) | start[index++];
if ((packet + address) >= start) {
//reference address can not be after where we are
return NULL;
}
if (_mdns_read_fqdn(packet, packet + address, name, buf, packet_len)) {
return start + index;
}
return NULL;
}
}
return start + index + 1;
}
/**
* @brief sets uint16_t value in a packet
*
* @param packet MDNS packet
* @param index offset of uint16_t value
* @param value the value to set
*/
static inline void _mdns_set_u16(uint8_t * packet, uint16_t index, uint16_t value)
{
if ((index + 1) >= MDNS_MAX_PACKET_SIZE) {
return;
}
packet[index] = (value >> 8) & 0xFF;
packet[index+1] = value & 0xFF;
}
/**
* @brief appends byte in a packet, incrementing the index
*
* @param packet MDNS packet
* @param index offset in the packet
* @param value the value to set
*
* @return length of added data: 0 on error or 1 on success
*/
static inline uint8_t _mdns_append_u8(uint8_t * packet, uint16_t * index, uint8_t value)
{
if (*index >= MDNS_MAX_PACKET_SIZE) {
return 0;
}
packet[*index] = value;
*index += 1;
return 1;
}
/**
* @brief appends uint16_t in a packet, incrementing the index
*
* @param packet MDNS packet
* @param index offset in the packet
* @param value the value to set
*
* @return length of added data: 0 on error or 2 on success
*/
static inline uint8_t _mdns_append_u16(uint8_t * packet, uint16_t * index, uint16_t value)
{
if ((*index + 1) >= MDNS_MAX_PACKET_SIZE) {
return 0;
}
_mdns_append_u8(packet, index, (value >> 8) & 0xFF);
_mdns_append_u8(packet, index, value & 0xFF);
return 2;
}
/**
* @brief appends uint32_t in a packet, incrementing the index
*
* @param packet MDNS packet
* @param index offset in the packet
* @param value the value to set
*
* @return length of added data: 0 on error or 4 on success
*/
static inline uint8_t _mdns_append_u32(uint8_t * packet, uint16_t * index, uint32_t value)
{
if ((*index + 3) >= MDNS_MAX_PACKET_SIZE) {
return 0;
}
_mdns_append_u8(packet, index, (value >> 24) & 0xFF);
_mdns_append_u8(packet, index, (value >> 16) & 0xFF);
_mdns_append_u8(packet, index, (value >> 8) & 0xFF);
_mdns_append_u8(packet, index, value & 0xFF);
return 4;
}
/**
* @brief appends answer type, class, ttl and data length to a packet, incrementing the index
*
* @param packet MDNS packet
* @param index offset in the packet
* @param type answer type
* @param ttl answer ttl
*
* @return length of added data: 0 on error or 10 on success
*/
static inline uint8_t _mdns_append_type(uint8_t * packet, uint16_t * index, uint8_t type, bool flush, uint32_t ttl)
{
if ((*index + 10) >= MDNS_MAX_PACKET_SIZE) {
return 0;
}
uint16_t mdns_class = MDNS_CLASS_IN;
if (flush) {
mdns_class = MDNS_CLASS_IN_FLUSH_CACHE;
}
if (type == MDNS_ANSWER_PTR) {
_mdns_append_u16(packet, index, MDNS_TYPE_PTR);
_mdns_append_u16(packet, index, mdns_class);
} else if (type == MDNS_ANSWER_TXT) {
_mdns_append_u16(packet, index, MDNS_TYPE_TXT);
_mdns_append_u16(packet, index, mdns_class);
} else if (type == MDNS_ANSWER_SRV) {
_mdns_append_u16(packet, index, MDNS_TYPE_SRV);
_mdns_append_u16(packet, index, mdns_class);
} else if (type == MDNS_ANSWER_A) {
_mdns_append_u16(packet, index, MDNS_TYPE_A);
_mdns_append_u16(packet, index, mdns_class);
} else if (type == MDNS_ANSWER_AAAA) {
_mdns_append_u16(packet, index, MDNS_TYPE_AAAA);
_mdns_append_u16(packet, index, mdns_class);
} else {
return 0;
}
_mdns_append_u32(packet, index, ttl);
_mdns_append_u16(packet, index, 0);
return 10;
}
static inline uint8_t _mdns_append_string_with_len(uint8_t * packet, uint16_t * index, const char * string, uint8_t len)
{
if ((*index + len + 1) >= MDNS_MAX_PACKET_SIZE) {
return 0;
}
_mdns_append_u8(packet, index, len);
memcpy(packet + *index, string, len);
*index += len;
return len + 1;
}
/**
* @brief appends single string to a packet, incrementing the index
*
* @param packet MDNS packet
* @param index offset in the packet
* @param string the string to append
*
* @return length of added data: 0 on error or length of the string + 1 on success
*/
static inline uint8_t _mdns_append_string(uint8_t * packet, uint16_t * index, const char * string)
{
uint8_t len = strlen(string);
if ((*index + len + 1) >= MDNS_MAX_PACKET_SIZE) {
return 0;
}
_mdns_append_u8(packet, index, len);
memcpy(packet + *index, string, len);
*index += len;
return len + 1;
}
/**
* @brief appends one TXT record ("key=value" or "key")
*
* @param packet MDNS packet
* @param index offset in the packet
* @param txt one txt record
*
* @return length of added data: length of the added txt value + 1 on success
* 0 if data won't fit the packet
* -1 if invalid TXT entry
*/
static inline int append_one_txt_record_entry(uint8_t * packet, uint16_t * index, mdns_txt_linked_item_t * txt)
{
if (txt == NULL || txt->key == NULL) {
return -1;
}
size_t key_len = strlen(txt->key);
size_t len = key_len + txt->value_len + (txt->value ? 1 : 0);
if ((*index + len + 1) >= MDNS_MAX_PACKET_SIZE) {
return 0;
}
_mdns_append_u8(packet, index, len);
memcpy(packet + *index, txt->key, key_len);
if (txt->value) {
packet[*index + key_len] = '=';
memcpy(packet + *index + key_len + 1, txt->value, txt->value_len);
}
*index += len;
return len + 1;
}
/**
* @brief appends FQDN to a packet, incrementing the index and
* compressing the output if previous occurrence of the string (or part of it) has been found
*
* @param packet MDNS packet
* @param index offset in the packet
* @param strings string array containing the parts of the FQDN
* @param count number of strings in the array
*
* @return length of added data: 0 on error or length on success
*/
static uint16_t _mdns_append_fqdn(uint8_t * packet, uint16_t * index, const char * strings[], uint8_t count, size_t packet_len)
{
if (!count) {
//empty string so terminate
return _mdns_append_u8(packet, index, 0);
}
mdns_name_t name;
static char buf[MDNS_NAME_BUF_LEN];
uint8_t len = strlen(strings[0]);
//try to find first the string length in the packet (if it exists)
uint8_t * len_location = (uint8_t *)memchr(packet, (char)len, *index);
while (len_location) {
//check if the string after len_location is the string that we are looking for
if (memcmp(len_location+1, strings[0], len)) { //not continuing with our string
search_next:
//try and find the length byte further in the packet
len_location = (uint8_t *)memchr(len_location+1, (char)len, *index - (len_location+1 - packet));
continue;
}
//seems that we might have found the string that we are looking for
//read the destination into name and compare
name.parts = 0;
name.sub = 0;
name.host[0] = 0;
name.service[0] = 0;
name.proto[0] = 0;
name.domain[0] = 0;
const uint8_t * content = _mdns_read_fqdn(packet, len_location, &name, buf, packet_len);
if (!content) {
//not a readable fqdn?
return 0;
}
if (name.parts == count) {
uint8_t i;
for (i=0; i<count; i++) {
if (strcasecmp(strings[i], (const char *)&name + (i * (MDNS_NAME_BUF_LEN)))) {
//not our string! let's search more
goto search_next;
}
}
//we actually have found the string
break;
} else {
goto search_next;
}
}
//string is not yet in the packet, so let's add it
if (!len_location) {
uint8_t written = _mdns_append_string(packet, index, strings[0]);
if (!written) {
return 0;
}
//run the same for the other strings in the name
return written + _mdns_append_fqdn(packet, index, &strings[1], count - 1, packet_len);
}
//we have found the string so let's insert a pointer to it instead
uint16_t offset = len_location - packet;
offset |= MDNS_NAME_REF;
return _mdns_append_u16(packet, index, offset);
}
/**
* @brief appends PTR record for service to a packet, incrementing the index
*
* @param packet MDNS packet
* @param index offset in the packet
* @param server the server that is hosting the service
* @param service the service to add record for
*
* @return length of added data: 0 on error or length on success
*/
static uint16_t _mdns_append_ptr_record(uint8_t * packet, uint16_t * index, const char * instance, const char * service, const char * proto, bool flush, bool bye)
{
const char * str[4];
uint16_t record_length = 0;
uint8_t part_length;
if (service == NULL) {
return 0;
}
str[0] = instance;
str[1] = service;
str[2] = proto;
str[3] = MDNS_DEFAULT_DOMAIN;
part_length = _mdns_append_fqdn(packet, index, str + 1, 3, MDNS_MAX_PACKET_SIZE);
if (!part_length) {
return 0;
}
record_length += part_length;
part_length = _mdns_append_type(packet, index, MDNS_ANSWER_PTR, false, bye?0:MDNS_ANSWER_PTR_TTL);
if (!part_length) {
return 0;
}
record_length += part_length;
uint16_t data_len_location = *index - 2;
part_length = _mdns_append_fqdn(packet, index, str, 4, MDNS_MAX_PACKET_SIZE);
if (!part_length) {
return 0;
}
_mdns_set_u16(packet, data_len_location, part_length);
record_length += part_length;
return record_length;
}
/**
* @brief appends PTR record for a subtype to a packet, incrementing the index
*
* @param packet MDNS packet
* @param index offset in the packet
* @param instance the service instance name
* @param subtype the service subtype
* @param proto the service protocol
* @param flush whether to set the flush flag
* @param bye whether to set the bye flag
*
* @return length of added data: 0 on error or length on success
*/
static uint16_t _mdns_append_subtype_ptr_record(uint8_t *packet, uint16_t *index, const char *instance,
const char *subtype, const char *service, const char *proto, bool flush,
bool bye)
{
const char *subtype_str[5] = {subtype, MDNS_SUB_STR, service, proto, MDNS_DEFAULT_DOMAIN};
const char *instance_str[4] = {instance, service, proto, MDNS_DEFAULT_DOMAIN};
uint16_t record_length = 0;
uint8_t part_length;
if (service == NULL) {
return 0;
}
part_length = _mdns_append_fqdn(packet, index, subtype_str, ARRAY_SIZE(subtype_str), MDNS_MAX_PACKET_SIZE);
if (!part_length) {
return 0;
}
record_length += part_length;
part_length = _mdns_append_type(packet, index, MDNS_ANSWER_PTR, false, bye ? 0 : MDNS_ANSWER_PTR_TTL);
if (!part_length) {
return 0;
}
record_length += part_length;
uint16_t data_len_location = *index - 2;
part_length = _mdns_append_fqdn(packet, index, instance_str, ARRAY_SIZE(instance_str), MDNS_MAX_PACKET_SIZE);
if (!part_length) {
return 0;
}
_mdns_set_u16(packet, data_len_location, part_length);
record_length += part_length;
return record_length;
}
/**
* @brief appends DNS-SD PTR record for service to a packet, incrementing the index
*
* @param packet MDNS packet
* @param index offset in the packet
* @param server the server that is hosting the service
* @param service the service to add record for
*
* @return length of added data: 0 on error or length on success
*/
static uint16_t _mdns_append_sdptr_record(uint8_t * packet, uint16_t * index, mdns_service_t * service, bool flush, bool bye)
{
const char * str[3];
const char * sd_str[4];
uint16_t record_length = 0;
uint8_t part_length;
if (service == NULL) {
return 0;
}
sd_str[0] = (char*)"_services";
sd_str[1] = (char*)"_dns-sd";
sd_str[2] = (char*)"_udp";
sd_str[3] = MDNS_DEFAULT_DOMAIN;
str[0] = service->service;
str[1] = service->proto;
str[2] = MDNS_DEFAULT_DOMAIN;
part_length = _mdns_append_fqdn(packet, index, sd_str, 4, MDNS_MAX_PACKET_SIZE);
record_length += part_length;
part_length = _mdns_append_type(packet, index, MDNS_ANSWER_PTR, flush, MDNS_ANSWER_PTR_TTL);
if (!part_length) {
return 0;
}
record_length += part_length;
uint16_t data_len_location = *index - 2;
part_length = _mdns_append_fqdn(packet, index, str, 3, MDNS_MAX_PACKET_SIZE);
if (!part_length) {
return 0;
}
_mdns_set_u16(packet, data_len_location, part_length);
record_length += part_length;
return record_length;
}
/**
* @brief appends TXT record for service to a packet, incrementing the index
*
* @param packet MDNS packet
* @param index offset in the packet
* @param server the server that is hosting the service
* @param service the service to add record for
*
* @return length of added data: 0 on error or length on success
*/
static uint16_t _mdns_append_txt_record(uint8_t * packet, uint16_t * index, mdns_service_t * service, bool flush, bool bye)
{
const char * str[4];
uint16_t record_length = 0;
uint8_t part_length;
if (service == NULL) {
return 0;
}
str[0] = _mdns_get_service_instance_name(service);
str[1] = service->service;
str[2] = service->proto;
str[3] = MDNS_DEFAULT_DOMAIN;
if (!str[0]) {
return 0;
}
part_length = _mdns_append_fqdn(packet, index, str, 4, MDNS_MAX_PACKET_SIZE);
if (!part_length) {
return 0;
}
record_length += part_length;
part_length = _mdns_append_type(packet, index, MDNS_ANSWER_TXT, flush, bye?0:MDNS_ANSWER_TXT_TTL);
if (!part_length) {
return 0;
}
record_length += part_length;
uint16_t data_len_location = *index - 2;
uint16_t data_len = 0;
mdns_txt_linked_item_t * txt = service->txt;
while (txt) {
int l = append_one_txt_record_entry(packet, index, txt);
if (l > 0) {
data_len += l;
} else if (l == 0) { // TXT entry won't fit into the mdns packet
return 0;
}
txt = txt->next;
}
if (!data_len) {
data_len = 1;
packet[*index] = 0;
*index = *index + 1;
}
_mdns_set_u16(packet, data_len_location, data_len);
record_length += data_len;
return record_length;
}
/**
* @brief appends SRV record for service to a packet, incrementing the index
*
* @param packet MDNS packet
* @param index offset in the packet
* @param server the server that is hosting the service
* @param service the service to add record for
*
* @return length of added data: 0 on error or length on success
*/
static uint16_t _mdns_append_srv_record(uint8_t * packet, uint16_t * index, mdns_service_t * service, bool flush, bool bye)
{
const char * str[4];
uint16_t record_length = 0;
uint8_t part_length;
if (service == NULL) {
return 0;
}
str[0] = _mdns_get_service_instance_name(service);
str[1] = service->service;
str[2] = service->proto;
str[3] = MDNS_DEFAULT_DOMAIN;
if (!str[0]) {
return 0;
}
part_length = _mdns_append_fqdn(packet, index, str, 4, MDNS_MAX_PACKET_SIZE);
if (!part_length) {
return 0;
}
record_length += part_length;
part_length = _mdns_append_type(packet, index, MDNS_ANSWER_SRV, flush, bye?0:MDNS_ANSWER_SRV_TTL);
if (!part_length) {
return 0;
}
record_length += part_length;
uint16_t data_len_location = *index - 2;
part_length = 0;
part_length += _mdns_append_u16(packet, index, service->priority);
part_length += _mdns_append_u16(packet, index, service->weight);
part_length += _mdns_append_u16(packet, index, service->port);
if (part_length != 6) {
return 0;
}
if (service->hostname) {
str[0] = service->hostname;
} else {
str[0] = _mdns_server->hostname;
}
str[1] = MDNS_DEFAULT_DOMAIN;
if (_str_null_or_empty(str[0])) {
return 0;
}
part_length = _mdns_append_fqdn(packet, index, str, 2, MDNS_MAX_PACKET_SIZE);
if (!part_length) {
return 0;
}
_mdns_set_u16(packet, data_len_location, part_length + 6);
record_length += part_length + 6;
return record_length;
}
/**
* @brief appends A record to a packet, incrementing the index
*
* @param packet MDNS packet
* @param index offset in the packet
* @param hostname the hostname address to add
* @param ip the IP address to add
*
* @return length of added data: 0 on error or length on success
*/
static uint16_t _mdns_append_a_record(uint8_t * packet, uint16_t * index, const char * hostname, uint32_t ip, bool flush, bool bye)
{
const char * str[2];
uint16_t record_length = 0;
uint8_t part_length;
str[0] = hostname;
str[1] = MDNS_DEFAULT_DOMAIN;
if (_str_null_or_empty(str[0])) {
return 0;
}
part_length = _mdns_append_fqdn(packet, index, str, 2, MDNS_MAX_PACKET_SIZE);
if (!part_length) {
return 0;
}
record_length += part_length;
part_length = _mdns_append_type(packet, index, MDNS_ANSWER_A, flush, bye?0:MDNS_ANSWER_A_TTL);
if (!part_length) {
return 0;
}
record_length += part_length;
uint16_t data_len_location = *index - 2;
if ((*index + 3) >= MDNS_MAX_PACKET_SIZE) {
return 0;
}
_mdns_append_u8(packet, index, ip & 0xFF);
_mdns_append_u8(packet, index, (ip >> 8) & 0xFF);
_mdns_append_u8(packet, index, (ip >> 16) & 0xFF);
_mdns_append_u8(packet, index, (ip >> 24) & 0xFF);
_mdns_set_u16(packet, data_len_location, 4);
record_length += 4;
return record_length;
}
#if CONFIG_LWIP_IPV6
/**
* @brief appends AAAA record to a packet, incrementing the index
*
* @param packet MDNS packet
* @param index offset in the packet
* @param hostname the hostname address to add
* @param ipv6 the IPv6 address to add
*
* @return length of added data: 0 on error or length on success
*/
static uint16_t _mdns_append_aaaa_record(uint8_t * packet, uint16_t * index, const char * hostname, uint8_t * ipv6, bool flush, bool bye)
{
const char * str[2];
uint16_t record_length = 0;
uint8_t part_length;
str[0] = hostname;
str[1] = MDNS_DEFAULT_DOMAIN;
if (_str_null_or_empty(str[0])) {
return 0;
}
part_length = _mdns_append_fqdn(packet, index, str, 2, MDNS_MAX_PACKET_SIZE);
if (!part_length) {
return 0;
}
record_length += part_length;
part_length = _mdns_append_type(packet, index, MDNS_ANSWER_AAAA, flush, bye?0:MDNS_ANSWER_AAAA_TTL);
if (!part_length) {
return 0;
}
record_length += part_length;
uint16_t data_len_location = *index - 2;
if ((*index + MDNS_ANSWER_AAAA_SIZE) > MDNS_MAX_PACKET_SIZE) {
return 0;
}
part_length = MDNS_ANSWER_AAAA_SIZE;
memcpy(packet + *index, ipv6, part_length);
*index += part_length;
_mdns_set_u16(packet, data_len_location, part_length);
record_length += part_length;
return record_length;
}
#endif
/**
* @brief Append question to packet
*/
static uint16_t _mdns_append_question(uint8_t * packet, uint16_t * index, mdns_out_question_t * q)
{
const char * str[4];
uint8_t str_index = 0;
uint8_t part_length;
if (q->host) {
str[str_index++] = q->host;
}
if (q->service) {
str[str_index++] = q->service;
}
if (q->proto) {
str[str_index++] = q->proto;
}
if (q->domain) {
str[str_index++] = q->domain;
}
part_length = _mdns_append_fqdn(packet, index, str, str_index, MDNS_MAX_PACKET_SIZE);
if (!part_length) {
return 0;
}
part_length += _mdns_append_u16(packet, index, q->type);
part_length += _mdns_append_u16(packet, index, q->unicast?0x8001:0x0001);
return part_length;
}
/**
* @brief Helper to get either ETH or STA if the other is provided
* Used when two interfaces are on the same subnet
*/
static mdns_if_t _mdns_get_other_if (mdns_if_t tcpip_if)
{
if (tcpip_if < MDNS_MAX_INTERFACES) {
return s_esp_netifs[tcpip_if].duplicate;
}
return MDNS_MAX_INTERFACES;
}
/**
* @brief Check if interface is duplicate (two interfaces on the same subnet)
*/
static bool _mdns_if_is_dup(mdns_if_t tcpip_if)
{
mdns_if_t other_if = _mdns_get_other_if (tcpip_if);
if (other_if == MDNS_MAX_INTERFACES) {
return false;
}
if (_mdns_server->interfaces[tcpip_if].pcbs[MDNS_IP_PROTOCOL_V4].state == PCB_DUP
|| _mdns_server->interfaces[tcpip_if].pcbs[MDNS_IP_PROTOCOL_V6].state == PCB_DUP
|| _mdns_server->interfaces[other_if].pcbs[MDNS_IP_PROTOCOL_V4].state == PCB_DUP
|| _mdns_server->interfaces[other_if].pcbs[MDNS_IP_PROTOCOL_V6].state == PCB_DUP
) {
return true;
}
return false;
}
#if CONFIG_LWIP_IPV6
/**
* @brief Check if IPv6 address is NULL
*/
static bool _ipv6_address_is_zero(esp_ip6_addr_t ip6)
{
uint8_t i;
uint8_t * data = (uint8_t *)ip6.addr;
for (i=0; i<_MDNS_SIZEOF_IP6_ADDR; i++) {
if (data[i]) {
return false;
}
}
return true;
}
#endif
static uint8_t _mdns_append_host_answer(uint8_t * packet, uint16_t * index, mdns_host_item_t * host,
uint8_t address_type, bool flush, bool bye)
{
mdns_ip_addr_t * addr = host->address_list;
uint8_t num_records = 0;
while (addr != NULL) {
if (addr->addr.type == address_type) {
if (address_type == ESP_IPADDR_TYPE_V4 &&
_mdns_append_a_record(packet, index, host->hostname, addr->addr.u_addr.ip4.addr, flush, bye) <= 0) {
break;
}
#if CONFIG_LWIP_IPV6
if (address_type == ESP_IPADDR_TYPE_V6 &&
_mdns_append_aaaa_record(packet, index, host->hostname, (uint8_t *)addr->addr.u_addr.ip6.addr, flush,
bye) <= 0) {
break;
}
#endif // CONFIG_LWIP_IPV6
num_records++;
}
addr = addr->next;
}
return num_records;
}
/**
* @brief Append PTR answers to packet
*
* @return number of answers added to the packet
*/
static uint8_t _mdns_append_service_ptr_answers(uint8_t *packet, uint16_t *index, mdns_service_t *service, bool flush,
bool bye)
{
uint8_t appended_answers = 0;
if (_mdns_append_ptr_record(packet, index, _mdns_get_service_instance_name(service), service->service,
service->proto, flush, bye) <= 0) {
return appended_answers;
}
appended_answers++;
mdns_subtype_t *subtype = service->subtype;
while (subtype) {
appended_answers +=
(_mdns_append_subtype_ptr_record(packet, index, _mdns_get_service_instance_name(service), subtype->subtype,
service->service, service->proto, flush, bye) > 0);
subtype = subtype->next;
}
return appended_answers;
}
/**
* @brief Append answer to packet
*
* @return number of answers added to the packet
*/
static uint8_t _mdns_append_answer(uint8_t * packet, uint16_t * index, mdns_out_answer_t * answer, mdns_if_t tcpip_if)
{
if (answer->type == MDNS_TYPE_PTR) {
if (answer->service) {
return _mdns_append_service_ptr_answers(packet, index, answer->service, answer->flush, answer->bye);
} else {
return _mdns_append_ptr_record(packet, index,
answer->custom_instance, answer->custom_service, answer->custom_proto,
answer->flush, answer->bye) > 0;
}
} else if (answer->type == MDNS_TYPE_SRV) {
return _mdns_append_srv_record(packet, index, answer->service, answer->flush, answer->bye) > 0;
} else if (answer->type == MDNS_TYPE_TXT) {
return _mdns_append_txt_record(packet, index, answer->service, answer->flush, answer->bye) > 0;
} else if (answer->type == MDNS_TYPE_SDPTR) {
return _mdns_append_sdptr_record(packet, index, answer->service, answer->flush, answer->bye) > 0;
} else if (answer->type == MDNS_TYPE_A) {
if (answer->host == &_mdns_self_host) {
esp_netif_ip_info_t if_ip_info;
if (!_mdns_server->interfaces[tcpip_if].pcbs[MDNS_IP_PROTOCOL_V4].pcb && _mdns_server->interfaces[tcpip_if].pcbs[MDNS_IP_PROTOCOL_V4].state != PCB_DUP) {
return 0;
}
if (esp_netif_get_ip_info(_mdns_get_esp_netif(tcpip_if), &if_ip_info)) {
return 0;
}
if (_mdns_append_a_record(packet, index, _mdns_server->hostname, if_ip_info.ip.addr, answer->flush, answer->bye) <= 0) {
return 0;
}
if (!_mdns_if_is_dup(tcpip_if)) {
return 1;
}
mdns_if_t other_if = _mdns_get_other_if (tcpip_if);
if (esp_netif_get_ip_info(_mdns_get_esp_netif(other_if), &if_ip_info)) {
return 1;
}
if (_mdns_append_a_record(packet, index, _mdns_server->hostname, if_ip_info.ip.addr, answer->flush, answer->bye) > 0) {
return 2;
}
return 1;
} else if (answer->host != NULL) {
return _mdns_append_host_answer(packet, index, answer->host, ESP_IPADDR_TYPE_V4, answer->flush, answer->bye);
}
}
#if CONFIG_LWIP_IPV6
else if (answer->type == MDNS_TYPE_AAAA) {
if (answer->host == &_mdns_self_host) {
struct esp_ip6_addr if_ip6;
if (!_mdns_server->interfaces[tcpip_if].pcbs[MDNS_IP_PROTOCOL_V6].pcb && _mdns_server->interfaces[tcpip_if].pcbs[MDNS_IP_PROTOCOL_V6].state != PCB_DUP) {
return 0;
}
if (esp_netif_get_ip6_linklocal(_mdns_get_esp_netif(tcpip_if), &if_ip6)) {
return 0;
}
if (_ipv6_address_is_zero(if_ip6)) {
return 0;
}
if (_mdns_append_aaaa_record(packet, index, _mdns_server->hostname, (uint8_t*)if_ip6.addr, answer->flush, answer->bye) <= 0) {
return 0;
}
if (!_mdns_if_is_dup(tcpip_if)) {
return 1;
}
mdns_if_t other_if = _mdns_get_other_if (tcpip_if);
if (esp_netif_get_ip6_linklocal(_mdns_get_esp_netif(other_if), &if_ip6)) {
return 1;
}
if (_mdns_append_aaaa_record(packet, index, _mdns_server->hostname, (uint8_t*)if_ip6.addr, answer->flush, answer->bye) > 0) {
return 2;
}
return 1;
} else if (answer->host != NULL) {
return _mdns_append_host_answer(packet, index, answer->host, ESP_IPADDR_TYPE_V6, answer->flush, answer->bye);
}
}
#endif
return 0;
}
/**
* @brief sends a packet
*
* @param p the packet
*/
static void _mdns_dispatch_tx_packet(mdns_tx_packet_t * p)
{
static uint8_t packet[MDNS_MAX_PACKET_SIZE];
uint16_t index = MDNS_HEAD_LEN;
memset(packet, 0, MDNS_HEAD_LEN);
mdns_out_question_t * q;
mdns_out_answer_t * a;
uint8_t count;
_mdns_set_u16(packet, MDNS_HEAD_FLAGS_OFFSET, p->flags);
_mdns_set_u16(packet, MDNS_HEAD_ID_OFFSET, p->id);
count = 0;
q = p->questions;
while (q) {
if (_mdns_append_question(packet, &index, q)) {
count++;
}
q = q->next;
}
_mdns_set_u16(packet, MDNS_HEAD_QUESTIONS_OFFSET, count);
count = 0;
a = p->answers;
while (a) {
count += _mdns_append_answer(packet, &index, a, p->tcpip_if);
a = a->next;
}
_mdns_set_u16(packet, MDNS_HEAD_ANSWERS_OFFSET, count);
count = 0;
a = p->servers;
while (a) {
count += _mdns_append_answer(packet, &index, a, p->tcpip_if);
a = a->next;
}
_mdns_set_u16(packet, MDNS_HEAD_SERVERS_OFFSET, count);
count = 0;
a = p->additional;
while (a) {
count += _mdns_append_answer(packet, &index, a, p->tcpip_if);
a = a->next;
}
_mdns_set_u16(packet, MDNS_HEAD_ADDITIONAL_OFFSET, count);
#ifdef MDNS_ENABLE_DEBUG
_mdns_dbg_printf("\nTX[%u][%u]: ", p->tcpip_if, p->ip_protocol);
if (p->dst.type == ESP_IPADDR_TYPE_V4) {
_mdns_dbg_printf("To: " IPSTR ":%u, ", IP2STR(&p->dst.u_addr.ip4), p->port);
} else {
_mdns_dbg_printf("To: " IPV6STR ":%u, ", IPV62STR(p->dst.u_addr.ip6), p->port);
}
mdns_debug_packet(packet, index);
#endif
_mdns_udp_pcb_write(p->tcpip_if, p->ip_protocol, &p->dst, p->port, packet, index);
}
/**
* @brief frees a packet
*
* @param packet the packet
*/
static void _mdns_free_tx_packet(mdns_tx_packet_t * packet)
{
if (!packet) {
return;
}
mdns_out_question_t * q = packet->questions;
while (q) {
mdns_out_question_t * next = q->next;
if (q->own_dynamic_memory) {
free((char *)q->host);
free((char *)q->service);
free((char *)q->proto);
free((char *)q->domain);
}
free(q);
q = next;
}
queueFree(mdns_out_answer_t, packet->answers);
queueFree(mdns_out_answer_t, packet->servers);
queueFree(mdns_out_answer_t, packet->additional);
free(packet);
}
/**
* @brief schedules a packet to be sent after given milliseconds
*
* @param packet the packet
* @param ms_after number of milliseconds after which the packet should be dispatched
*/
static void _mdns_schedule_tx_packet(mdns_tx_packet_t * packet, uint32_t ms_after)
{
if (!packet) {
return;
}
packet->send_at = (xTaskGetTickCount() * portTICK_PERIOD_MS) + ms_after;
packet->next = NULL;
if (!_mdns_server->tx_queue_head || _mdns_server->tx_queue_head->send_at > packet->send_at) {
packet->next = _mdns_server->tx_queue_head;
_mdns_server->tx_queue_head = packet;
return;
}
mdns_tx_packet_t * q = _mdns_server->tx_queue_head;
while (q->next && q->next->send_at <= packet->send_at) {
q = q->next;
}
packet->next = q->next;
q->next = packet;
}
/**
* @brief free all packets scheduled for sending
*/
static void _mdns_clear_tx_queue_head(void)
{
mdns_tx_packet_t * q;
while (_mdns_server->tx_queue_head) {
q = _mdns_server->tx_queue_head;
_mdns_server->tx_queue_head = _mdns_server->tx_queue_head->next;
_mdns_free_tx_packet(q);
}
}
/**
* @brief clear packets scheduled for sending on a specific interface
*
* @param tcpip_if the interface
* @param ip_protocol pcb type V4/V6
*/
static void _mdns_clear_pcb_tx_queue_head(mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
{
mdns_tx_packet_t * q, * p;
while (_mdns_server->tx_queue_head && _mdns_server->tx_queue_head->tcpip_if == tcpip_if && _mdns_server->tx_queue_head->ip_protocol == ip_protocol) {
q = _mdns_server->tx_queue_head;
_mdns_server->tx_queue_head = _mdns_server->tx_queue_head->next;
_mdns_free_tx_packet(q);
}
if (_mdns_server->tx_queue_head) {
q = _mdns_server->tx_queue_head;
while (q->next) {
if (q->next->tcpip_if == tcpip_if && q->next->ip_protocol == ip_protocol) {
p = q->next;
q->next = p->next;
_mdns_free_tx_packet(p);
} else {
q = q->next;
}
}
}
}
/**
* @brief get the next packet scheduled for sending on a specific interface
*
* @param tcpip_if the interface
* @param ip_protocol pcb type V4/V6
*/
static mdns_tx_packet_t * _mdns_get_next_pcb_packet(mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
{
mdns_tx_packet_t * q = _mdns_server->tx_queue_head;
while (q) {
if (q->tcpip_if == tcpip_if && q->ip_protocol == ip_protocol) {
return q;
}
q = q->next;
}
return NULL;
}
/**
* @brief Find, remove and free answer from the scheduled packets
*/
static void _mdns_remove_scheduled_answer(mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol, uint16_t type, mdns_srv_item_t * service)
{
mdns_srv_item_t s = {NULL, NULL};
if (!service) {
service = &s;
}
mdns_tx_packet_t * q = _mdns_server->tx_queue_head;
while (q) {
if (q->tcpip_if == tcpip_if && q->ip_protocol == ip_protocol && q->distributed) {
mdns_out_answer_t * a = q->answers;
if (a->type == type && a->service == service->service) {
q->answers = q->answers->next;
free(a);
} else {
while (a->next) {
if (a->next->type == type && a->next->service == service->service) {
mdns_out_answer_t * b = a->next;
a->next = b->next;
free(b);
break;
}
a = a->next;
}
}
}
q = q->next;
}
}
/**
* @brief Remove and free answer from answer list (destination)
*/
static void _mdns_dealloc_answer(mdns_out_answer_t ** destination, uint16_t type, mdns_srv_item_t * service)
{
mdns_out_answer_t * d = *destination;
if (!d) {
return;
}
mdns_srv_item_t s = {NULL, NULL};
if (!service) {
service = &s;
}
if (d->type == type && d->service == service->service) {
*destination = d->next;
free(d);
return;
}
while (d->next) {
mdns_out_answer_t * a = d->next;
if (a->type == type && a->service == service->service) {
d->next = a->next;
free(a);
return;
}
d = d->next;
}
}
/**
* @brief Allocate new answer and add it to answer list (destination)
*/
static bool _mdns_alloc_answer(mdns_out_answer_t ** destination, uint16_t type, mdns_service_t * service,
mdns_host_item_t * host, bool flush, bool bye)
{
mdns_out_answer_t * d = *destination;
while (d) {
if (d->type == type && d->service == service && d->host == host) {
return true;
}
d = d->next;
}
mdns_out_answer_t * a = (mdns_out_answer_t *)malloc(sizeof(mdns_out_answer_t));
if (!a) {
HOOK_MALLOC_FAILED;
return false;
}
a->type = type;
a->service = service;
a->host = host;
a->custom_service = NULL;
a->bye = bye;
a->flush = flush;
a->next = NULL;
queueToEnd(mdns_out_answer_t, *destination, a);
return true;
}
/**
* @brief Allocate new packet for sending
*/
static mdns_tx_packet_t * _mdns_alloc_packet_default(mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
{
mdns_tx_packet_t * packet = (mdns_tx_packet_t*)malloc(sizeof(mdns_tx_packet_t));
if (!packet) {
HOOK_MALLOC_FAILED;
return NULL;
}
memset((uint8_t*)packet, 0, sizeof(mdns_tx_packet_t));
packet->tcpip_if = tcpip_if;
packet->ip_protocol = ip_protocol;
packet->port = MDNS_SERVICE_PORT;
if (ip_protocol == MDNS_IP_PROTOCOL_V4) {
esp_ip_addr_t addr = ESP_IP4ADDR_INIT(224, 0, 0, 251);
memcpy(&packet->dst, &addr, sizeof(esp_ip_addr_t));
}
#if CONFIG_LWIP_IPV6
else {
esp_ip_addr_t addr = ESP_IP6ADDR_INIT(0x000002ff, 0, 0, 0xfb000000);
memcpy(&packet->dst, &addr, sizeof(esp_ip_addr_t));
}
#endif
return packet;
}
static bool _mdns_create_answer_from_service(mdns_tx_packet_t * packet, mdns_service_t * service,
mdns_parsed_question_t * question, bool shared, bool send_flush)
{
mdns_host_item_t * host = mdns_get_host_item(service->hostname);
if (question->type == MDNS_TYPE_PTR || question->type == MDNS_TYPE_ANY) {
if (!_mdns_alloc_answer(&packet->answers, MDNS_TYPE_PTR, service, NULL, false, false) ||
!_mdns_alloc_answer(&packet->answers, MDNS_TYPE_SRV, service, NULL, send_flush, false) ||
!_mdns_alloc_answer(&packet->answers, MDNS_TYPE_TXT, service, NULL, send_flush, false) ||
!_mdns_alloc_answer(shared ? &packet->additional : &packet->answers, MDNS_TYPE_A, service, host, send_flush,
false) ||
!_mdns_alloc_answer(shared ? &packet->additional : &packet->answers, MDNS_TYPE_AAAA, service, host,
send_flush, false)) {
return false;
}
} else if (question->type == MDNS_TYPE_SRV) {
if (!_mdns_alloc_answer(&packet->answers, MDNS_TYPE_SRV, service, NULL, send_flush, false) ||
!_mdns_alloc_answer(&packet->additional, MDNS_TYPE_A, service, host, send_flush, false) ||
!_mdns_alloc_answer(&packet->additional, MDNS_TYPE_AAAA, service, host, send_flush, false)) {
return false;
}
} else if (question->type == MDNS_TYPE_TXT) {
if (!_mdns_alloc_answer(&packet->answers, MDNS_TYPE_TXT, service, NULL, send_flush, false)) {
return false;
}
} else if (question->type == MDNS_TYPE_SDPTR) {
shared = true;
if (!_mdns_alloc_answer(&packet->answers, MDNS_TYPE_SDPTR, service, NULL, false, false)) {
return false;
}
}
return true;
}
static bool _mdns_create_answer_from_hostname(mdns_tx_packet_t * packet, const char * hostname, bool send_flush)
{
mdns_host_item_t * host = mdns_get_host_item(hostname);
if (!_mdns_alloc_answer(&packet->answers, MDNS_TYPE_A, NULL, host, send_flush, false) ||
!_mdns_alloc_answer(&packet->answers, MDNS_TYPE_AAAA, NULL, host, send_flush, false)) {
return false;
}
return true;
}
static bool _mdns_service_match_ptr_question(const mdns_service_t *service, const mdns_parsed_question_t *question)
{
if (!_mdns_service_match(service, question->service, question->proto, NULL)) {
return false;
}
// The question parser stores anything before _type._proto in question->host
// So the question->host can be subtype or instance name based on its content
if (question->sub) {
mdns_subtype_t *subtype = service->subtype;
while (subtype) {
if (!strcasecmp(subtype->subtype, question->host)) {
return true;
}
subtype = subtype->next;
}
return false;
}
if (question->host) {
if (strcasecmp(_mdns_get_service_instance_name(service), question->host) != 0) {
return false;
}
}
return true;
}
/**
* @brief Create answer packet to questions from parsed packet
*/
static void _mdns_create_answer_from_parsed_packet(mdns_parsed_packet_t *parsed_packet)
{
if (!parsed_packet->questions) {
return;
}
bool send_flush = parsed_packet->src_port == MDNS_SERVICE_PORT;
bool unicast = false;
bool shared = false;
mdns_tx_packet_t *packet = _mdns_alloc_packet_default(parsed_packet->tcpip_if, parsed_packet->ip_protocol);
if (!packet) {
return;
}
packet->flags = MDNS_FLAGS_AUTHORITATIVE;
packet->distributed = parsed_packet->distributed;
packet->id = parsed_packet->id;
mdns_parsed_question_t *q = parsed_packet->questions;
while (q) {
shared = q->type == MDNS_TYPE_PTR || q->type == MDNS_TYPE_SDPTR || !parsed_packet->probe;
if (q->type == MDNS_TYPE_SRV || q->type == MDNS_TYPE_TXT) {
mdns_srv_item_t *service = _mdns_get_service_item_instance(q->host, q->service, q->proto, NULL);
if (service == NULL || !_mdns_create_answer_from_service(packet, service->service, q, shared, send_flush)) {
_mdns_free_tx_packet(packet);
return;
}
} else if (q->service && q->proto) {
mdns_srv_item_t *service = _mdns_server->services;
while (service) {
if (_mdns_service_match_ptr_question(service->service, q)) {
if (!_mdns_create_answer_from_service(packet, service->service, q, shared, send_flush)) {
_mdns_free_tx_packet(packet);
return;
}
}
service = service->next;
}
} else if (q->type == MDNS_TYPE_A || q->type == MDNS_TYPE_AAAA) {
if (!_mdns_create_answer_from_hostname(packet, q->host, send_flush)) {
_mdns_free_tx_packet(packet);
return;
}
} else if (q->type == MDNS_TYPE_ANY) {
if (!_mdns_append_host_list(&packet->answers, send_flush, false)) {
_mdns_free_tx_packet(packet);
return;
}
} else if (!_mdns_alloc_answer(&packet->answers, q->type, NULL, NULL, send_flush, false)) {
_mdns_free_tx_packet(packet);
return;
}
#ifdef MDNS_REPEAT_QUERY_IN_RESPONSE
if (parsed_packet->src_port != MDNS_SERVICE_PORT && // Repeat the queries only for "One-Shot mDNS queries"
(q->type == MDNS_TYPE_ANY || q->type == MDNS_TYPE_A || q->type == MDNS_TYPE_AAAA)) {
mdns_out_question_t * out_question = malloc(sizeof(mdns_out_question_t));
if (out_question == NULL) {
HOOK_MALLOC_FAILED;
_mdns_free_tx_packet(packet);
return;
}
out_question->type = q->type;
out_question->unicast = q->unicast;
out_question->host = q->host;
q->host = NULL;
out_question->service = q->service;
q->service = NULL;
out_question->proto = q->proto;
q->proto = NULL;
out_question->domain = q->domain;
q->domain = NULL;
out_question->next = NULL;
out_question->own_dynamic_memory = true;
queueToEnd(mdns_out_question_t, packet->questions, out_question);
}
#endif // MDNS_REPEAT_QUERY_IN_RESPONSE
if (q->unicast) {
unicast = true;
}
q = q->next;
}
if (unicast || !send_flush) {
memcpy(&packet->dst, &parsed_packet->src, sizeof(esp_ip_addr_t));
packet->port = parsed_packet->src_port;
}
static uint8_t share_step = 0;
if (shared) {
_mdns_schedule_tx_packet(packet, 25 + (share_step * 25));
share_step = (share_step + 1) & 0x03;
} else {
_mdns_dispatch_tx_packet(packet);
_mdns_free_tx_packet(packet);
}
}
/**
* @brief Check if question is already in the list
*/
static bool _mdns_question_exists(mdns_out_question_t * needle, mdns_out_question_t * haystack)
{
while (haystack) {
if (haystack->type == needle->type
&& haystack->host == needle->host
&& haystack->service == needle->service
&& haystack->proto == needle->proto) {
return true;
}
haystack = haystack->next;
}
return false;
}
static bool _mdns_append_host(mdns_out_answer_t ** destination, mdns_host_item_t * host, bool flush, bool bye)
{
if (!_mdns_alloc_answer(destination, MDNS_TYPE_A, NULL, host, flush, bye)) {
return false;
}
if (!_mdns_alloc_answer(destination, MDNS_TYPE_AAAA, NULL, host, flush, bye)) {
return false;
}
return true;
}
static bool _mdns_append_host_list_in_services(mdns_out_answer_t ** destination, mdns_srv_item_t * services[],
size_t services_len, bool flush, bool bye)
{
if (services == NULL) {
mdns_host_item_t * host = mdns_get_host_item(_mdns_server->hostname);
if (host != NULL) {
return _mdns_append_host(destination, host, flush, bye);
}
return true;
}
for (size_t i = 0; i < services_len; i++) {
mdns_host_item_t *host = mdns_get_host_item(services[i]->service->hostname);
if (!_mdns_append_host(destination, host, flush, bye)) {
return false;
}
}
return true;
}
static bool _mdns_append_host_list(mdns_out_answer_t ** destination, bool flush, bool bye)
{
if (!_str_null_or_empty(_mdns_server->hostname)) {
mdns_host_item_t * self_host = mdns_get_host_item(_mdns_server->hostname);
if (!_mdns_append_host(destination, self_host, flush, bye)) {
return false;
}
}
mdns_host_item_t * host = _mdns_host_list;
while (host != NULL) {
host = host->next;
if (!_mdns_append_host(destination, host, flush, bye)) {
return false;
}
}
return true;
}
static bool _mdns_append_host_question(mdns_out_question_t **questions, const char *hostname, bool unicast)
{
mdns_out_question_t *q = (mdns_out_question_t *)malloc(sizeof(mdns_out_question_t));
if (!q) {
HOOK_MALLOC_FAILED;
return false;
}
q->next = NULL;
q->unicast = unicast;
q->type = MDNS_TYPE_ANY;
q->host = hostname;
q->service = NULL;
q->proto = NULL;
q->domain = MDNS_DEFAULT_DOMAIN;
q->own_dynamic_memory = false;
if (_mdns_question_exists(q, *questions)) {
free(q);
} else {
queueToEnd(mdns_out_question_t, *questions, q);
}
return true;
}
static bool _mdns_append_host_questions_for_services(mdns_out_question_t **questions, mdns_srv_item_t *services[],
size_t len, bool unicast)
{
if (!_str_null_or_empty(_mdns_server->hostname) &&
!_mdns_append_host_question(questions, _mdns_server->hostname, unicast)) {
return false;
}
for (size_t i = 0; i < len; i++) {
if (!_mdns_append_host_question(questions, services[i]->service->hostname, unicast)) {
return false;
}
}
return true;
}
/**
* @brief Create probe packet for particular services on particular PCB
*/
static mdns_tx_packet_t * _mdns_create_probe_packet(mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol, mdns_srv_item_t * services[], size_t len, bool first, bool include_ip)
{
mdns_tx_packet_t * packet = _mdns_alloc_packet_default(tcpip_if, ip_protocol);
if (!packet) {
return NULL;
}
size_t i;
for (i=0; i<len; i++) {
mdns_out_question_t * q = (mdns_out_question_t *)malloc(sizeof(mdns_out_question_t));
if (!q) {
HOOK_MALLOC_FAILED;
_mdns_free_tx_packet(packet);
return NULL;
}
q->next = NULL;
q->unicast = first;
q->type = MDNS_TYPE_ANY;
q->host = _mdns_get_service_instance_name(services[i]->service);
q->service = services[i]->service->service;
q->proto = services[i]->service->proto;
q->domain = MDNS_DEFAULT_DOMAIN;
q->own_dynamic_memory = false;
if (!q->host || _mdns_question_exists(q, packet->questions)) {
free(q);
continue;
} else {
queueToEnd(mdns_out_question_t, packet->questions, q);
}
if (!q->host || !_mdns_alloc_answer(&packet->servers, MDNS_TYPE_SRV, services[i]->service, NULL, false, false)) {
_mdns_free_tx_packet(packet);
return NULL;
}
}
if (include_ip) {
if (!_mdns_append_host_questions_for_services(&packet->questions, services, len, first)) {
_mdns_free_tx_packet(packet);
return NULL;
}
if (!_mdns_append_host_list_in_services(&packet->servers, services, len, false, false)) {
_mdns_free_tx_packet(packet);
return NULL;
}
}
return packet;
}
/**
* @brief Create announce packet for particular services on particular PCB
*/
static mdns_tx_packet_t * _mdns_create_announce_packet(mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol, mdns_srv_item_t * services[], size_t len, bool include_ip)
{
mdns_tx_packet_t * packet = _mdns_alloc_packet_default(tcpip_if, ip_protocol);
if (!packet) {
return NULL;
}
packet->flags = MDNS_FLAGS_AUTHORITATIVE;
uint8_t i;
for (i=0; i<len; i++) {
if (!_mdns_alloc_answer(&packet->answers, MDNS_TYPE_SDPTR, services[i]->service, NULL, false, false)
|| !_mdns_alloc_answer(&packet->answers, MDNS_TYPE_PTR, services[i]->service, NULL, false, false)
|| !_mdns_alloc_answer(&packet->answers, MDNS_TYPE_SRV, services[i]->service, NULL, true, false)
|| !_mdns_alloc_answer(&packet->answers, MDNS_TYPE_TXT, services[i]->service, NULL, true, false)) {
_mdns_free_tx_packet(packet);
return NULL;
}
}
if (include_ip) {
if (!_mdns_append_host_list_in_services(&packet->servers, services, len, true, false)) {
_mdns_free_tx_packet(packet);
return NULL;
}
}
return packet;
}
/**
* @brief Convert probe packet to announce
*/
static mdns_tx_packet_t * _mdns_create_announce_from_probe(mdns_tx_packet_t * probe)
{
mdns_tx_packet_t * packet = _mdns_alloc_packet_default(probe->tcpip_if, probe->ip_protocol);
if (!packet) {
return NULL;
}
packet->flags = MDNS_FLAGS_AUTHORITATIVE;
mdns_out_answer_t * s = probe->servers;
while (s) {
if (s->type == MDNS_TYPE_SRV) {
if (!_mdns_alloc_answer(&packet->answers, MDNS_TYPE_SDPTR, s->service, NULL, false, false)
|| !_mdns_alloc_answer(&packet->answers, MDNS_TYPE_PTR, s->service, NULL, false, false)
|| !_mdns_alloc_answer(&packet->answers, MDNS_TYPE_SRV, s->service, NULL, true, false)
|| !_mdns_alloc_answer(&packet->answers, MDNS_TYPE_TXT, s->service, NULL, true, false)) {
_mdns_free_tx_packet(packet);
return NULL;
}
mdns_host_item_t *host = mdns_get_host_item(s->service->hostname);
if (!_mdns_alloc_answer(&packet->answers, MDNS_TYPE_A, NULL, host, true, false)
|| !_mdns_alloc_answer(&packet->answers, MDNS_TYPE_AAAA, NULL, host, true, false)) {
_mdns_free_tx_packet(packet);
return NULL;
}
} else if (s->type == MDNS_TYPE_A || s->type == MDNS_TYPE_AAAA) {
if (!_mdns_alloc_answer(&packet->answers, s->type, NULL, s->host, true, false)) {
_mdns_free_tx_packet(packet);
return NULL;
}
}
s = s->next;
}
return packet;
}
/**
* @brief Send by for particular services on particular PCB
*/
static void _mdns_pcb_send_bye(mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol, mdns_srv_item_t ** services, size_t len, bool include_ip)
{
mdns_tx_packet_t * packet = _mdns_alloc_packet_default(tcpip_if, ip_protocol);
if (!packet) {
return;
}
packet->flags = MDNS_FLAGS_AUTHORITATIVE;
size_t i;
for (i=0; i<len; i++) {
if (!_mdns_alloc_answer(&packet->answers, MDNS_TYPE_PTR, services[i]->service, NULL, true, true)) {
_mdns_free_tx_packet(packet);
return;
}
}
if (include_ip) {
_mdns_append_host_list_in_services(&packet->answers, services, len, true, true);
}
_mdns_dispatch_tx_packet(packet);
_mdns_free_tx_packet(packet);
}
/**
* @brief Send probe for additional services on particular PCB
*/
static void _mdns_init_pcb_probe_new_service(mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol, mdns_srv_item_t ** services, size_t len, bool probe_ip)
{
mdns_pcb_t * pcb = &_mdns_server->interfaces[tcpip_if].pcbs[ip_protocol];
size_t services_final_len = len;
if (PCB_STATE_IS_PROBING(pcb)) {
services_final_len += pcb->probe_services_len;
}
mdns_srv_item_t ** _services = NULL;
if (services_final_len) {
_services = (mdns_srv_item_t **)malloc(sizeof(mdns_srv_item_t *) * services_final_len);
if (!_services) {
HOOK_MALLOC_FAILED;
return;
}
size_t i;
for (i=0; i<len; i++) {
_services[i] = services[i];
}
if (pcb->probe_services) {
for (i=0; i<pcb->probe_services_len; i++) {
_services[len+i] = pcb->probe_services[i];
}
free(pcb->probe_services);
}
}
probe_ip = pcb->probe_ip || probe_ip;
pcb->probe_ip = false;
pcb->probe_services = NULL;
pcb->probe_services_len = 0;
pcb->probe_running = false;
mdns_tx_packet_t * packet = _mdns_create_probe_packet(tcpip_if, ip_protocol, _services, services_final_len, true, probe_ip);
if (!packet) {
free(_services);
return;
}
pcb->probe_ip = probe_ip;
pcb->probe_services = _services;
pcb->probe_services_len = services_final_len;
pcb->probe_running = true;
_mdns_schedule_tx_packet(packet, ((pcb->failed_probes > 5)?1000:120) + (esp_random() & 0x7F));
pcb->state = PCB_PROBE_1;
}
/**
* @brief Send probe for particular services on particular PCB
*
* Tests possible duplication on probing service structure and probes only for new entries.
* - If pcb probing then add only non-probing services and restarts probing
* - If pcb not probing, run probing for all specified services
*/
static void _mdns_init_pcb_probe(mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol, mdns_srv_item_t ** services, size_t len, bool probe_ip)
{
mdns_pcb_t * pcb = &_mdns_server->interfaces[tcpip_if].pcbs[ip_protocol];
_mdns_clear_pcb_tx_queue_head(tcpip_if, ip_protocol);
if (_str_null_or_empty(_mdns_server->hostname)) {
pcb->state = PCB_RUNNING;
return;
}
if (PCB_STATE_IS_PROBING(pcb)) {
// Looking for already probing services to resolve duplications
mdns_srv_item_t * new_probe_services[len];
int new_probe_service_len = 0;
bool found;
for (size_t j=0; j < len; ++j) {
found = false;
for (int i=0; i < pcb->probe_services_len; ++i) {
if (pcb->probe_services[i] == services[j]) {
found = true;
break;
}
}
if (!found) {
new_probe_services[new_probe_service_len++] = services[j];
}
}
// init probing for newly added services
_mdns_init_pcb_probe_new_service(tcpip_if, ip_protocol,
new_probe_service_len?new_probe_services:NULL, new_probe_service_len, probe_ip);
} else {
// not probing, so init for all services
_mdns_init_pcb_probe_new_service(tcpip_if, ip_protocol, services, len, probe_ip);
}
}
/**
* @brief Restart the responder on particular PCB
*/
static void _mdns_restart_pcb(mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
{
size_t srv_count = 0;
mdns_srv_item_t * a = _mdns_server->services;
while (a) {
srv_count++;
a = a->next;
}
mdns_srv_item_t * services[srv_count];
size_t i = 0;
a = _mdns_server->services;
while (a) {
services[i++] = a;
a = a->next;
}
_mdns_init_pcb_probe(tcpip_if, ip_protocol, services, srv_count, true);
}
/**
* @brief Send by for particular services
*/
static void _mdns_send_bye(mdns_srv_item_t ** services, size_t len, bool include_ip)
{
uint8_t i, j;
if (_str_null_or_empty(_mdns_server->hostname)) {
return;
}
for (i=0; i<MDNS_MAX_INTERFACES; i++) {
for (j=0; j<MDNS_IP_PROTOCOL_MAX; j++) {
if (_mdns_server->interfaces[i].pcbs[j].pcb && _mdns_server->interfaces[i].pcbs[j].state == PCB_RUNNING) {
_mdns_pcb_send_bye((mdns_if_t)i, (mdns_ip_protocol_t)j, services, len, include_ip);
}
}
}
}
/**
* @brief Send announcement on particular PCB
*/
static void _mdns_announce_pcb(mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol, mdns_srv_item_t ** services, size_t len, bool include_ip)
{
mdns_pcb_t * _pcb = &_mdns_server->interfaces[tcpip_if].pcbs[ip_protocol];
size_t i;
if (_pcb->pcb) {
if (PCB_STATE_IS_PROBING(_pcb)) {
_mdns_init_pcb_probe(tcpip_if, ip_protocol, services, len, include_ip);
} else if (PCB_STATE_IS_ANNOUNCING(_pcb)) {
mdns_tx_packet_t * p = _mdns_get_next_pcb_packet(tcpip_if, ip_protocol);
if (p) {
for (i=0; i<len; i++) {
if (!_mdns_alloc_answer(&p->answers, MDNS_TYPE_SDPTR, services[i]->service, NULL, false, false)
|| !_mdns_alloc_answer(&p->answers, MDNS_TYPE_PTR, services[i]->service, NULL, false, false)
|| !_mdns_alloc_answer(&p->answers, MDNS_TYPE_SRV, services[i]->service, NULL, true, false)
|| !_mdns_alloc_answer(&p->answers, MDNS_TYPE_TXT, services[i]->service, NULL, true, false)) {
break;
}
}
if (include_ip) {
_mdns_dealloc_answer(&p->additional, MDNS_TYPE_A, NULL);
_mdns_dealloc_answer(&p->additional, MDNS_TYPE_AAAA, NULL);
_mdns_append_host_list_in_services(&p->answers, services, len, true, false);
}
_pcb->state = PCB_ANNOUNCE_1;
}
} else if (_pcb->state == PCB_RUNNING) {
if (_str_null_or_empty(_mdns_server->hostname)) {
return;
}
_pcb->state = PCB_ANNOUNCE_1;
mdns_tx_packet_t * p = _mdns_create_announce_packet(tcpip_if, ip_protocol, services, len, include_ip);
if (p) {
_mdns_schedule_tx_packet(p, 0);
}
}
}
}
/**
* @brief Send probe on all active PCBs
*/
static void _mdns_probe_all_pcbs(mdns_srv_item_t ** services, size_t len, bool probe_ip, bool clear_old_probe)
{
uint8_t i, j;
for (i=0; i<MDNS_MAX_INTERFACES; i++) {
for (j=0; j<MDNS_IP_PROTOCOL_MAX; j++) {
if (_mdns_server->interfaces[i].pcbs[j].pcb) {
mdns_pcb_t * _pcb = &_mdns_server->interfaces[i].pcbs[j];
if (clear_old_probe) {
free(_pcb->probe_services);
_pcb->probe_services = NULL;
_pcb->probe_services_len = 0;
_pcb->probe_running = false;
}
_mdns_init_pcb_probe((mdns_if_t)i, (mdns_ip_protocol_t)j, services, len, probe_ip);
}
}
}
}
/**
* @brief Send announcement on all active PCBs
*/
static void _mdns_announce_all_pcbs(mdns_srv_item_t ** services, size_t len, bool include_ip)
{
uint8_t i, j;
for (i=0; i<MDNS_MAX_INTERFACES; i++) {
for (j=0; j<MDNS_IP_PROTOCOL_MAX; j++) {
_mdns_announce_pcb((mdns_if_t)i, (mdns_ip_protocol_t)j, services, len, include_ip);
}
}
}
/**
* @brief Restart the responder on all active PCBs
*/
static void _mdns_send_final_bye(bool include_ip)
{
//collect all services and start probe
size_t srv_count = 0;
mdns_srv_item_t * a = _mdns_server->services;
while (a) {
srv_count++;
a = a->next;
}
if (!srv_count) {
return;
}
mdns_srv_item_t * services[srv_count];
size_t i = 0;
a = _mdns_server->services;
while (a) {
services[i++] = a;
a = a->next;
}
_mdns_send_bye(services, srv_count, include_ip);
}
/**
* @brief Stop the responder on all services without instance
*/
static void _mdns_send_bye_all_pcbs_no_instance(bool include_ip)
{
size_t srv_count = 0;
mdns_srv_item_t * a = _mdns_server->services;
while (a) {
if (!a->service->instance) {
srv_count++;
}
a = a->next;
}
if (!srv_count) {
return;
}
mdns_srv_item_t * services[srv_count];
size_t i = 0;
a = _mdns_server->services;
while (a) {
if (!a->service->instance) {
services[i++] = a;
}
a = a->next;
}
_mdns_send_bye(services, srv_count, include_ip);
}
/**
* @brief Restart the responder on all services without instance
*/
static void _mdns_restart_all_pcbs_no_instance(void)
{
size_t srv_count = 0;
mdns_srv_item_t * a = _mdns_server->services;
while (a) {
if (!a->service->instance) {
srv_count++;
}
a = a->next;
}
if (!srv_count) {
return;
}
mdns_srv_item_t * services[srv_count];
size_t i = 0;
a = _mdns_server->services;
while (a) {
if (!a->service->instance) {
services[i++] = a;
}
a = a->next;
}
_mdns_probe_all_pcbs(services, srv_count, false, true);
}
/**
* @brief Restart the responder on all active PCBs
*/
static void _mdns_restart_all_pcbs(void)
{
_mdns_clear_tx_queue_head();
size_t srv_count = 0;
mdns_srv_item_t * a = _mdns_server->services;
while (a) {
srv_count++;
a = a->next;
}
mdns_srv_item_t * services[srv_count];
size_t l = 0;
a = _mdns_server->services;
while (a) {
services[l++] = a;
a = a->next;
}
_mdns_probe_all_pcbs(services, srv_count, true, true);
}
/**
* @brief creates/allocates new text item list
* @param num_items service number of txt items or 0
* @param txt service txt items array or NULL
*
* @return pointer to the linked txt item list or NULL
*/
static mdns_txt_linked_item_t * _mdns_allocate_txt(size_t num_items, mdns_txt_item_t txt[])
{
mdns_txt_linked_item_t * new_txt = NULL;
size_t i = 0;
if (num_items) {
for (i=0; i<num_items; i++) {
mdns_txt_linked_item_t * new_item = (mdns_txt_linked_item_t *)malloc(sizeof(mdns_txt_linked_item_t));
if (!new_item) {
HOOK_MALLOC_FAILED;
break;
}
new_item->key = strdup(txt[i].key);
if (!new_item->key) {
free(new_item);
break;
}
new_item->value = strdup(txt[i].value);
if (!new_item->value) {
free((char *)new_item->key);
free(new_item);
break;
}
new_item->value_len = strlen(new_item->value);
new_item->next = new_txt;
new_txt = new_item;
}
}
return new_txt;
}
/**
* @brief Deallocate the txt linked list
* @param txt pointer to the txt pointer to free, noop if txt==NULL
*/
static void _mdns_free_linked_txt(mdns_txt_linked_item_t *txt)
{
mdns_txt_linked_item_t *t;
while (txt) {
t = txt;
txt = txt->next;
free((char *)t->value);
free((char *)t->key);
free(t);
}
}
/**
* @brief creates/allocates new service
* @param service service type
* @param proto service proto
* @param hostname service hostname
* @param port service port
* @param instance service instance
* @param num_items service number of txt items or 0
* @param txt service txt items array or NULL
*
* @return pointer to the service or NULL on error
*/
static mdns_service_t * _mdns_create_service(const char * service, const char * proto, const char * hostname,
uint16_t port, const char * instance, size_t num_items,
mdns_txt_item_t txt[])
{
mdns_service_t * s = (mdns_service_t *)calloc(1, sizeof(mdns_service_t));
if (!s) {
HOOK_MALLOC_FAILED;
return NULL;
}
mdns_txt_linked_item_t * new_txt = _mdns_allocate_txt(num_items, txt);
if (num_items && new_txt == NULL) {
goto fail;
}
s->priority = 0;
s->weight = 0;
s->instance = instance?strndup(instance, MDNS_NAME_BUF_LEN - 1):NULL;
s->txt = new_txt;
s->port = port;
s->subtype = NULL;
if (hostname) {
s->hostname = strndup(hostname, MDNS_NAME_BUF_LEN - 1);
if (!s->hostname) {
goto fail;
}
} else {
s->hostname = NULL;
}
s->service = strndup(service, MDNS_NAME_BUF_LEN - 1);
if (!s->service) {
goto fail;
}
s->proto = strndup(proto, MDNS_NAME_BUF_LEN - 1);
if (!s->proto) {
goto fail;
}
return s;
fail:
_mdns_free_linked_txt(s->txt);
free((char *)s->instance);
free((char *)s->service);
free((char *)s->proto);
free((char *)s->hostname);
free(s);
return NULL;
}
/**
* @brief Remove and free service answer from answer list (destination)
*/
static void _mdns_dealloc_scheduled_service_answers(mdns_out_answer_t ** destination, mdns_service_t * service)
{
mdns_out_answer_t * d = *destination;
if (!d) {
return;
}
while (d && d->service == service) {
*destination = d->next;
free(d);
d = *destination;
}
while (d && d->next) {
mdns_out_answer_t * a = d->next;
if (a->service == service) {
d->next = a->next;
free(a);
} else {
d = d->next;
}
}
}
/**
* @brief Find, remove and free answers and scheduled packets for service
*/
static void _mdns_remove_scheduled_service_packets(mdns_service_t * service)
{
if (!service) {
return;
}
mdns_tx_packet_t * p = NULL;
mdns_tx_packet_t * q = _mdns_server->tx_queue_head;
while (q) {
bool had_answers = (q->answers != NULL);
_mdns_dealloc_scheduled_service_answers(&(q->answers), service);
_mdns_dealloc_scheduled_service_answers(&(q->additional), service);
_mdns_dealloc_scheduled_service_answers(&(q->servers), service);
mdns_pcb_t * _pcb = &_mdns_server->interfaces[q->tcpip_if].pcbs[q->ip_protocol];
if(_pcb->pcb) {
if (PCB_STATE_IS_PROBING(_pcb)) {
uint8_t i;
//check if we are probing this service
for (i=0; i<_pcb->probe_services_len; i++) {
mdns_srv_item_t * s = _pcb->probe_services[i];
if (s->service == service){
break;
}
}
if (i < _pcb->probe_services_len) {
if (_pcb->probe_services_len > 1) {
uint8_t n;
for (n=(i+1); n<_pcb->probe_services_len; n++) {
_pcb->probe_services[n-1] = _pcb->probe_services[n];
}
_pcb->probe_services_len--;
} else {
_pcb->probe_services_len = 0;
free(_pcb->probe_services);
_pcb->probe_services = NULL;
if (!_pcb->probe_ip) {
_pcb->probe_running = false;
_pcb->state = PCB_RUNNING;
}
}
if (q->questions) {
mdns_out_question_t * qsn = NULL;
mdns_out_question_t * qs = q->questions;
if (qs->type == MDNS_TYPE_ANY
&& qs->service && strcmp(qs->service, service->service) == 0
&& qs->proto && strcmp(qs->proto, service->proto) == 0)
{
q->questions = q->questions->next;
free(qs);
} else while (qs->next) {
qsn = qs->next;
if (qsn->type == MDNS_TYPE_ANY
&& qsn->service && strcmp(qsn->service, service->service) == 0
&& qsn->proto && strcmp(qsn->proto, service->proto) == 0)
{
qs->next = qsn->next;
free(qsn);
break;
}
qs = qs->next;
}
}
}
} else if (PCB_STATE_IS_ANNOUNCING(_pcb)) {
//if answers were cleared, set to running
if (had_answers && q->answers == NULL) {
_pcb->state = PCB_RUNNING;
}
}
}
p = q;
q = q->next;
if(!p->questions && !p->answers && !p->additional && !p->servers){
queueDetach(mdns_tx_packet_t, _mdns_server->tx_queue_head, p);
_mdns_free_tx_packet(p);
}
}
}
/**
* @brief free service memory
*
* @param service the service
*/
static void _mdns_free_service(mdns_service_t * service)
{
if (!service) {
return;
}
free((char *)service->instance);
free((char *)service->service);
free((char *)service->proto);
free((char *)service->hostname);
while (service->txt) {
mdns_txt_linked_item_t * s = service->txt;
service->txt = service->txt->next;
free((char *)s->key);
free((char *)s->value);
free(s);
}
while (service->subtype) {
mdns_subtype_t * next = service->subtype->next;
free((char *)service->subtype->subtype);
free(service->subtype);
service->subtype = next;
}
free(service);
}
/*
* Received Packet Handling
* */
/**
* @brief Detect SRV collision
*/
static int _mdns_check_srv_collision(mdns_service_t * service, uint16_t priority, uint16_t weight, uint16_t port, const char * host, const char * domain)
{
if (_str_null_or_empty(_mdns_server->hostname)) {
return 0;
}
size_t our_host_len = strlen(_mdns_server->hostname);
size_t our_len = 14 + our_host_len;
size_t their_host_len = strlen(host);
size_t their_domain_len = strlen(domain);
size_t their_len = 9 + their_host_len + their_domain_len;
if (their_len > our_len) {
return 1;//they win
} else if (their_len < our_len) {
return -1;//we win
}
uint16_t our_index = 0;
uint8_t our_data[our_len];
_mdns_append_u16(our_data, &our_index, service->priority);
_mdns_append_u16(our_data, &our_index, service->weight);
_mdns_append_u16(our_data, &our_index, service->port);
our_data[our_index++] = our_host_len;
memcpy(our_data + our_index, _mdns_server->hostname, our_host_len);
our_index += our_host_len;
our_data[our_index++] = 5;
memcpy(our_data + our_index, MDNS_DEFAULT_DOMAIN, 5);
our_index += 5;
our_data[our_index++] = 0;
uint16_t their_index = 0;
uint8_t their_data[their_len];
_mdns_append_u16(their_data, &their_index, priority);
_mdns_append_u16(their_data, &their_index, weight);
_mdns_append_u16(their_data, &their_index, port);
their_data[their_index++] = their_host_len;
memcpy(their_data + their_index, host, their_host_len);
their_index += their_host_len;
their_data[their_index++] = their_domain_len;
memcpy(their_data + their_index, domain, their_domain_len);
their_index += their_domain_len;
their_data[their_index++] = 0;
int ret = memcmp(our_data, their_data, our_len);
if (ret > 0) {
return -1;//we win
} else if (ret < 0) {
return 1;//they win
}
return 0;//same
}
/**
* @brief Detect TXT collision
*/
static int _mdns_check_txt_collision(mdns_service_t * service, const uint8_t * data, size_t len)
{
size_t data_len = 0;
if (len == 1 && service->txt) {
return -1;//we win
} else if (len > 1 && !service->txt) {
return 1;//they win
} else if (len == 1 && !service->txt) {
return 0;//same
}
mdns_txt_linked_item_t * txt = service->txt;
while (txt) {
data_len += 1 /* record-len */ + strlen(txt->key) + txt->value_len + (txt->value ? 1 : 0 /* "=" */);
txt = txt->next;
}
if (len > data_len) {
return 1;//they win
} else if (len < data_len) {
return -1;//we win
}
uint8_t ours[len];
uint16_t index = 0;
txt = service->txt;
while (txt) {
append_one_txt_record_entry(ours, &index, txt);
txt = txt->next;
}
int ret = memcmp(ours, data, len);
if (ret > 0) {
return -1;//we win
} else if (ret < 0) {
return 1;//they win
}
return 0;//same
}
/**
* @brief Set interface as duplicate if another is found on the same subnet
*/
static void _mdns_dup_interface(mdns_if_t tcpip_if)
{
uint8_t i;
mdns_if_t other_if = _mdns_get_other_if (tcpip_if);
if (other_if == MDNS_MAX_INTERFACES) {
return; // no other interface found
}
for (i=0; i<MDNS_IP_PROTOCOL_MAX; i++) {
if (_mdns_server->interfaces[other_if].pcbs[i].pcb) {
//stop this interface and mark as dup
if (_mdns_server->interfaces[tcpip_if].pcbs[i].pcb) {
_mdns_clear_pcb_tx_queue_head(tcpip_if, i);
_mdns_pcb_deinit(tcpip_if, i);
}
_mdns_server->interfaces[tcpip_if].pcbs[i].state = PCB_DUP;
_mdns_announce_pcb(other_if, i, NULL, 0, true);
}
}
}
/**
* @brief Detect IPv4 address collision
*/
static int _mdns_check_a_collision(esp_ip4_addr_t * ip, mdns_if_t tcpip_if)
{
esp_netif_ip_info_t if_ip_info;
esp_netif_ip_info_t other_ip_info;
if (!ip->addr) {
return 1;//denial! they win
}
if (esp_netif_get_ip_info(_mdns_get_esp_netif(tcpip_if), &if_ip_info)) {
return 1;//they win
}
int ret = memcmp((uint8_t*)&if_ip_info.ip.addr, (uint8_t*)&ip->addr, sizeof(esp_ip4_addr_t));
if (ret > 0) {
return -1;//we win
} else if (ret < 0) {
//is it the other interface?
mdns_if_t other_if = _mdns_get_other_if (tcpip_if);
if (other_if == MDNS_MAX_INTERFACES) {
return 1;//AP interface! They win
}
if (esp_netif_get_ip_info(_mdns_get_esp_netif(other_if), &other_ip_info)) {
return 1;//IPv4 not active! They win
}
if (ip->addr != other_ip_info.ip.addr) {
return 1;//IPv4 not ours! They win
}
_mdns_dup_interface(tcpip_if);
return 2;//they win
}
return 0;//same
}
#if CONFIG_LWIP_IPV6
/**
* @brief Detect IPv6 address collision
*/
static int _mdns_check_aaaa_collision(esp_ip6_addr_t * ip, mdns_if_t tcpip_if)
{
struct esp_ip6_addr if_ip6;
struct esp_ip6_addr other_ip6;
if (_ipv6_address_is_zero(*ip)) {
return 1;//denial! they win
}
if (esp_netif_get_ip6_linklocal(_mdns_get_esp_netif(tcpip_if), &if_ip6)) {
return 1;//they win
}
int ret = memcmp((uint8_t*)&if_ip6.addr, (uint8_t*)ip->addr, _MDNS_SIZEOF_IP6_ADDR);
if (ret > 0) {
return -1;//we win
} else if (ret < 0) {
//is it the other interface?
mdns_if_t other_if = _mdns_get_other_if (tcpip_if);
if (other_if == MDNS_MAX_INTERFACES) {
return 1;//AP interface! They win
}
if (esp_netif_get_ip6_linklocal(_mdns_get_esp_netif(other_if), &other_ip6)) {
return 1;//IPv6 not active! They win
}
if (memcmp((uint8_t*)&other_ip6.addr, (uint8_t*)ip->addr, _MDNS_SIZEOF_IP6_ADDR)) {
return 1;//IPv6 not ours! They win
}
_mdns_dup_interface(tcpip_if);
return 2;//they win
}
return 0;//same
}
#endif
static bool _hostname_is_ours(const char * hostname)
{
if (strcasecmp(hostname, _mdns_server->hostname) == 0) {
return true;
}
mdns_host_item_t * host = _mdns_host_list;
while (host != NULL) {
if (strcasecmp(hostname, host->hostname) == 0) {
return true;
}
host = host->next;
}
return false;
}
/**
* @brief Adds a delegated hostname to the linked list
* @param hostname Host name pointer
* @param address_list Address list
* @return true on success
* false if the host wasn't attached (this is our hostname, or alloc failure) so we have to free the structs
*/
static bool _mdns_delegate_hostname_add(const char * hostname, mdns_ip_addr_t * address_list)
{
if (_hostname_is_ours(hostname)) {
return false;
}
mdns_host_item_t * host = (mdns_host_item_t *)malloc(sizeof(mdns_host_item_t));
if (host == NULL) {
return false;
}
host->address_list = address_list;
host->hostname = hostname;
host->next = _mdns_host_list;
_mdns_host_list = host;
return true;
}
static void free_address_list(mdns_ip_addr_t * address_list)
{
while (address_list != NULL) {
mdns_ip_addr_t * next = address_list->next;
free(address_list);
address_list = next;
}
}
static mdns_ip_addr_t * copy_address_list(const mdns_ip_addr_t * address_list)
{
mdns_ip_addr_t * head = NULL;
mdns_ip_addr_t * tail = NULL;
while (address_list != NULL) {
mdns_ip_addr_t * addr = (mdns_ip_addr_t *)malloc(sizeof(mdns_ip_addr_t));
if (addr == NULL) {
free_address_list(head);
return NULL;
}
addr->addr = address_list->addr;
addr->next = NULL;
if (head == NULL) {
head = addr;
tail = addr;
} else {
tail->next = addr;
tail = tail->next;
}
address_list = address_list->next;
}
return head;
}
static void free_delegated_hostnames(void)
{
mdns_host_item_t * host = _mdns_host_list;
while (host != NULL) {
free_address_list(host->address_list);
free((char *)host->hostname);
mdns_host_item_t *item = host;
host = host->next;
free(item);
}
}
static bool _mdns_delegate_hostname_remove(const char * hostname)
{
mdns_srv_item_t * srv = _mdns_server->services;
mdns_srv_item_t * prev_srv = NULL;
while (srv) {
if (strcasecmp(srv->service->hostname, hostname) == 0) {
mdns_srv_item_t * to_free = srv;
_mdns_send_bye(&srv, 1, false);
_mdns_remove_scheduled_service_packets(srv->service);
if (prev_srv == NULL) {
_mdns_server->services = srv->next;
srv = srv->next;
} else {
prev_srv->next = srv->next;
srv = srv->next;
}
_mdns_free_service(to_free->service);
free(to_free);
} else {
prev_srv = srv;
srv = srv->next;
}
}
mdns_host_item_t * host = _mdns_host_list;
mdns_host_item_t * prev_host = NULL;
while (host != NULL) {
if (strcasecmp(hostname, host->hostname) == 0) {
if (prev_host == NULL) {
_mdns_host_list = host->next;
} else {
prev_host->next = host->next;
}
free_address_list(host->address_list);
free((char *)host->hostname);
free(host);
break;
} else {
prev_host = host;
host = host->next;
}
}
return true;
}
/**
* @brief Check if parsed name is discovery
*/
static bool _mdns_name_is_discovery(mdns_name_t * name, uint16_t type)
{
return (
(name->host && name->host[0] && !strcasecmp(name->host, "_services"))
&& (name->service && name->service[0] && !strcasecmp(name->service, "_dns-sd"))
&& (name->proto && name->proto[0] && !strcasecmp(name->proto, "_udp"))
&& (name->domain && name->domain[0] && !strcasecmp(name->domain, MDNS_DEFAULT_DOMAIN))
&& type == MDNS_TYPE_PTR
);
}
/**
* @brief Check if the parsed name is ours (matches service or host name)
*/
static bool _mdns_name_is_ours(mdns_name_t * name)
{
//domain have to be "local"
if (_str_null_or_empty(name->domain) || strcasecmp(name->domain, MDNS_DEFAULT_DOMAIN)) {
return false;
}
//if service and proto are empty, host must match out hostname
if (_str_null_or_empty(name->service) && _str_null_or_empty(name->proto)) {
if (!_str_null_or_empty(name->host)
&& !_str_null_or_empty(_mdns_server->hostname)
&& _hostname_is_ours(name->host))
{
return true;
}
return false;
}
//if service or proto is empty, name is invalid
if (_str_null_or_empty(name->service) || _str_null_or_empty(name->proto)) {
return false;
}
//find the service
mdns_srv_item_t * service;
if (name->sub) {
service = _mdns_get_service_item_subtype(name->host, name->service, name->proto);
} else if (_str_null_or_empty(name->host)) {
service = _mdns_get_service_item(name->service, name->proto, NULL);
} else {
service = _mdns_get_service_item_instance(name->host, name->service, name->proto, NULL);
}
if (!service) {
return false;
}
//if query is PTR query and we have service, we have success
if (name->sub || _str_null_or_empty(name->host)) {
return true;
}
//OK we have host in the name. find what is the instance of the service
const char * instance = _mdns_get_service_instance_name(service->service);
if (instance == NULL) {
return false;
}
//compare the instance against the name
if (strcasecmp(name->host, instance) == 0) {
return true;
}
return false;
}
/**
* @brief read uint16_t from a packet
* @param packet the packet
* @param index index in the packet where the value starts
*
* @return the value
*/
static inline uint16_t _mdns_read_u16(const uint8_t * packet, uint16_t index)
{
return (uint16_t)(packet[index]) << 8 | packet[index+1];
}
/**
* @brief read uint32_t from a packet
* @param packet the packet
* @param index index in the packet where the value starts
*
* @return the value
*/
static inline uint32_t _mdns_read_u32(const uint8_t * packet, uint16_t index)
{
return (uint32_t)(packet[index]) << 24 | (uint32_t)(packet[index+1]) << 16 | (uint32_t)(packet[index+2]) << 8 | packet[index+3];
}
/**
* @brief reads and formats MDNS FQDN into mdns_name_t structure
*
* @param packet MDNS packet
* @param start Starting point of FQDN
* @param name mdns_name_t structure to populate
*
* @return the address after the parsed FQDN in the packet or NULL on error
*/
static const uint8_t * _mdns_parse_fqdn(const uint8_t * packet, const uint8_t * start, mdns_name_t * name, size_t packet_len)
{
name->parts = 0;
name->sub = 0;
name->host[0] = 0;
name->service[0] = 0;
name->proto[0] = 0;
name->domain[0] = 0;
name->invalid = false;
static char buf[MDNS_NAME_BUF_LEN];
const uint8_t * next_data = (uint8_t*)_mdns_read_fqdn(packet, start, name, buf, packet_len);
if (!next_data) {
return 0;
}
if (!name->parts || name->invalid) {
return next_data;
}
if (name->parts == 3) {
memmove((uint8_t*)name + (MDNS_NAME_BUF_LEN), (uint8_t*)name, 3*(MDNS_NAME_BUF_LEN));
name->host[0] = 0;
} else if (name->parts == 2) {
memmove((uint8_t*)(name->domain), (uint8_t*)(name->service), (MDNS_NAME_BUF_LEN));
name->service[0] = 0;
name->proto[0] = 0;
}
if (strcasecmp(name->domain, MDNS_DEFAULT_DOMAIN) == 0 || strcasecmp(name->domain, "arpa") == 0) {
return next_data;
}
name->invalid = true; // mark the current name invalid, but continue with other question
return next_data;
}
/**
* @brief Called from parser to check if question matches particular service
*/
static bool _mdns_question_matches(mdns_parsed_question_t * question, uint16_t type, mdns_srv_item_t * service)
{
if (question->type != type) {
return false;
}
if (type == MDNS_TYPE_A || type == MDNS_TYPE_AAAA) {
return true;
} else if (type == MDNS_TYPE_PTR || type == MDNS_TYPE_SDPTR) {
if (question->service && question->proto && question->domain
&& !strcasecmp(service->service->service, question->service)
&& !strcasecmp(service->service->proto, question->proto)
&& !strcasecmp(MDNS_DEFAULT_DOMAIN, question->domain)) {
return true;
}
} else if (service && (type == MDNS_TYPE_SRV || type == MDNS_TYPE_TXT)) {
const char * name = _mdns_get_service_instance_name(service->service);
if (name && question->host && question->service && question->proto && question->domain
&& !strcasecmp(name, question->host)
&& !strcasecmp(service->service->service, question->service)
&& !strcasecmp(service->service->proto, question->proto)
&& !strcasecmp(MDNS_DEFAULT_DOMAIN, question->domain)) {
return true;
}
}
return false;
}
/**
* @brief Removes saved question from parsed data
*/
static void _mdns_remove_parsed_question(mdns_parsed_packet_t * parsed_packet, uint16_t type, mdns_srv_item_t * service)
{
mdns_parsed_question_t * q = parsed_packet->questions;
if (_mdns_question_matches(q, type, service)) {
parsed_packet->questions = q->next;
free(q->host);
free(q->service);
free(q->proto);
free(q->domain);
free(q);
return;
}
while (q->next) {
mdns_parsed_question_t * p = q->next;
if (_mdns_question_matches(p, type, service)) {
q->next = p->next;
free(p->host);
free(p->service);
free(p->proto);
free(p->domain);
free(p);
return;
}
q = q->next;
}
}
/**
* @brief Get number of items in TXT parsed data
*/
static int _mdns_txt_items_count_get(const uint8_t * data, size_t len)
{
if (len == 1) {
return 0;
}
int num_items = 0;
uint16_t i=0;
size_t partLen = 0;
while (i < len) {
partLen = data[i++];
if (!partLen) {
break;
}
if ((i+partLen) > len) {
return -1;//error
}
i+=partLen;
num_items++;
}
return num_items;
}
/**
* @brief Get the length of TXT item's key name
*/
static int _mdns_txt_item_name_get_len(const uint8_t * data, size_t len)
{
if (*data == '=') {
return -1;
}
for (size_t i = 0; i < len; i++) {
if (data[i] == '=') {
return i;
}
}
return len;
}
/**
* @brief Create TXT result array from parsed TXT data
*/
static void _mdns_result_txt_create(const uint8_t *data, size_t len, mdns_txt_item_t **out_txt, uint8_t **out_value_len,
size_t *out_count)
{
*out_txt = NULL;
*out_count = 0;
uint16_t i=0, y;
size_t partLen = 0;
int num_items = _mdns_txt_items_count_get(data, len);
if (num_items < 0) {
return;//error
}
if (!num_items) {
return;
}
mdns_txt_item_t * txt = (mdns_txt_item_t *)malloc(sizeof(mdns_txt_item_t) * num_items);
if (!txt) {
HOOK_MALLOC_FAILED;
return;
}
uint8_t * txt_value_len = (uint8_t *)malloc(num_items);
if (!txt_value_len) {
free(txt);
HOOK_MALLOC_FAILED;
return;
}
memset(txt, 0, sizeof(mdns_txt_item_t) * num_items);
memset(txt_value_len, 0, num_items);
size_t txt_num = 0;
while (i < len) {
partLen = data[i++];
if (!partLen) {
break;
}
if ((i+partLen) > len) {
goto handle_error;//error
}
int name_len = _mdns_txt_item_name_get_len(data+i, partLen);
if (name_len < 0) {//invalid item (no name)
i += partLen;
continue;
}
char * key = (char *)malloc(name_len + 1);
if (!key) {
HOOK_MALLOC_FAILED;
goto handle_error;//error
}
mdns_txt_item_t * t = &txt[txt_num];
uint8_t * value_len = &txt_value_len[txt_num];
txt_num++;
memcpy(key, data + i, name_len);
key[name_len] = 0;
i += name_len + 1;
t->key = key;
int new_value_len = partLen - name_len - 1;
if (new_value_len > 0) {
char * value = (char *)malloc(new_value_len + 1);
if (!value) {
HOOK_MALLOC_FAILED;
goto handle_error;//error
}
memcpy(value, data + i, new_value_len);
value[new_value_len] = 0;
*value_len = new_value_len;
i += new_value_len;
t->value = value;
}
}
*out_txt = txt;
*out_count = txt_num;
*out_value_len = txt_value_len;
return;
handle_error :
for (y=0; y<txt_num; y++) {
mdns_txt_item_t * t = &txt[y];
free((char *)t->key);
free((char *)t->value);
}
free(txt_value_len);
free(txt);
}
/**
* @brief Duplicate string or return error
*/
static esp_err_t _mdns_strdup_check(char ** out, char * in)
{
if (in && in[0]) {
*out = strdup(in);
if (!*out) {
return ESP_FAIL;
}
return ESP_OK;
}
*out = NULL;
return ESP_OK;
}
/**
* @brief main packet parser
*
* @param packet the packet
*/
void mdns_parse_packet(mdns_rx_packet_t * packet)
{
static mdns_name_t n;
mdns_header_t header;
const uint8_t * data = _mdns_get_packet_data(packet);
size_t len = _mdns_get_packet_len(packet);
const uint8_t * content = data + MDNS_HEAD_LEN;
bool do_not_reply = false;
mdns_search_once_t * search_result = NULL;
#ifdef MDNS_ENABLE_DEBUG
_mdns_dbg_printf("\nRX[%u][%u]: ", packet->tcpip_if, (uint32_t)packet->ip_protocol);
if (packet->src.type == ESP_IPADDR_TYPE_V4) {
_mdns_dbg_printf("From: " IPSTR ":%u, To: " IPSTR ", ", IP2STR(&packet->src.u_addr.ip4), packet->src_port, IP2STR(&packet->dest.u_addr.ip4));
} else {
_mdns_dbg_printf("From: " IPV6STR ":%u, To: " IPV6STR ", ", IPV62STR(packet->src.u_addr.ip6), packet->src_port, IPV62STR(packet->dest.u_addr.ip6));
}
mdns_debug_packet(data, len);
#endif
// Check if the packet wasn't sent by us
if (packet->ip_protocol == MDNS_IP_PROTOCOL_V4) {
esp_netif_ip_info_t if_ip_info;
if (esp_netif_get_ip_info(_mdns_get_esp_netif(packet->tcpip_if), &if_ip_info) == ESP_OK &&
memcmp(&if_ip_info.ip.addr, &packet->src.u_addr.ip4.addr, sizeof(esp_ip4_addr_t)) == 0) {
return;
}
#if CONFIG_LWIP_IPV6
} else {
struct esp_ip6_addr if_ip6;
if (esp_netif_get_ip6_linklocal(_mdns_get_esp_netif(packet->tcpip_if), &if_ip6) == ESP_OK &&
memcmp(&if_ip6, &packet->src.u_addr.ip6, sizeof(esp_ip6_addr_t)) == 0) {
return;
}
#endif
}
// Check for the minimum size of mdns packet
if (len <= MDNS_HEAD_ADDITIONAL_OFFSET) {
return;
}
mdns_parsed_packet_t * parsed_packet = (mdns_parsed_packet_t *)malloc(sizeof(mdns_parsed_packet_t));
if (!parsed_packet) {
HOOK_MALLOC_FAILED;
return;
}
memset(parsed_packet, 0, sizeof(mdns_parsed_packet_t));
mdns_name_t * name = &n;
memset(name, 0, sizeof(mdns_name_t));
header.id = _mdns_read_u16(data, MDNS_HEAD_ID_OFFSET);
header.flags.value = _mdns_read_u16(data, MDNS_HEAD_FLAGS_OFFSET);
header.questions = _mdns_read_u16(data, MDNS_HEAD_QUESTIONS_OFFSET);
header.answers = _mdns_read_u16(data, MDNS_HEAD_ANSWERS_OFFSET);
header.servers = _mdns_read_u16(data, MDNS_HEAD_SERVERS_OFFSET);
header.additional = _mdns_read_u16(data, MDNS_HEAD_ADDITIONAL_OFFSET);
if (header.flags.value == MDNS_FLAGS_AUTHORITATIVE && packet->src_port != MDNS_SERVICE_PORT) {
free(parsed_packet);
return;
}
//if we have not set the hostname, we can not answer questions
if (header.questions && !header.answers && _str_null_or_empty(_mdns_server->hostname)) {
free(parsed_packet);
return;
}
parsed_packet->tcpip_if = packet->tcpip_if;
parsed_packet->ip_protocol = packet->ip_protocol;
parsed_packet->multicast = packet->multicast;
parsed_packet->authoritative = header.flags.value == MDNS_FLAGS_AUTHORITATIVE;
parsed_packet->distributed = header.flags.value == MDNS_FLAGS_DISTRIBUTED;
parsed_packet->id = header.id;
esp_netif_ip_addr_copy(&parsed_packet->src, &packet->src);
parsed_packet->src_port = packet->src_port;
if (header.questions) {
uint8_t qs = header.questions;
while (qs--) {
content = _mdns_parse_fqdn(data, content, name, len);
if (!content) {
header.answers = 0;
header.additional = 0;
header.servers = 0;
goto clear_rx_packet;//error
}
if (content + MDNS_CLASS_OFFSET + 1 >= data + len) {
goto clear_rx_packet; // malformed packet, won't read behind it
}
uint16_t type = _mdns_read_u16(content, MDNS_TYPE_OFFSET);
uint16_t mdns_class = _mdns_read_u16(content, MDNS_CLASS_OFFSET);
bool unicast = !!(mdns_class & 0x8000);
mdns_class &= 0x7FFF;
content = content + 4;
if (mdns_class != 0x0001 || name->invalid) {//bad class or invalid name for this question entry
continue;
}
if (_mdns_name_is_discovery(name, type)) {
//service discovery
parsed_packet->discovery = true;
mdns_srv_item_t * a = _mdns_server->services;
while (a) {
mdns_parsed_question_t * question = (mdns_parsed_question_t *)calloc(1, sizeof(mdns_parsed_question_t));
if (!question) {
HOOK_MALLOC_FAILED;
goto clear_rx_packet;
}
question->next = parsed_packet->questions;
parsed_packet->questions = question;
question->unicast = unicast;
question->type = MDNS_TYPE_SDPTR;
question->host = NULL;
question->service = strdup(a->service->service);
question->proto = strdup(a->service->proto);
question->domain = strdup(MDNS_DEFAULT_DOMAIN);
if (!question->service || !question->proto || !question->domain) {
goto clear_rx_packet;
}
a = a->next;
}
continue;
}
if (!_mdns_name_is_ours(name)) {
continue;
}
if (type == MDNS_TYPE_ANY && !_str_null_or_empty(name->host)) {
parsed_packet->probe = true;
}
mdns_parsed_question_t * question = (mdns_parsed_question_t *)calloc(1, sizeof(mdns_parsed_question_t));
if (!question) {
HOOK_MALLOC_FAILED;
goto clear_rx_packet;
}
question->next = parsed_packet->questions;
parsed_packet->questions = question;
question->unicast = unicast;
question->type = type;
question->sub = name->sub;
if (_mdns_strdup_check(&(question->host), name->host)
|| _mdns_strdup_check(&(question->service), name->service)
|| _mdns_strdup_check(&(question->proto), name->proto)
|| _mdns_strdup_check(&(question->domain), name->domain)) {
goto clear_rx_packet;
}
}
}
if (header.questions && !parsed_packet->questions && !parsed_packet->discovery && !header.answers) {
goto clear_rx_packet;
} else if (header.answers || header.servers || header.additional) {
uint16_t recordIndex = 0;
while (content < (data + len)) {
content = _mdns_parse_fqdn(data, content, name, len);
if (!content) {
goto clear_rx_packet;//error
}
if (content + MDNS_LEN_OFFSET + 1 >= data + len) {
goto clear_rx_packet; // malformed packet, won't read behind it
}
uint16_t type = _mdns_read_u16(content, MDNS_TYPE_OFFSET);
uint16_t mdns_class = _mdns_read_u16(content, MDNS_CLASS_OFFSET);
uint32_t ttl = _mdns_read_u32(content, MDNS_TTL_OFFSET);
uint16_t data_len = _mdns_read_u16(content, MDNS_LEN_OFFSET);
const uint8_t * data_ptr = content + MDNS_DATA_OFFSET;
mdns_class &= 0x7FFF;
content = data_ptr + data_len;
if (content > (data + len)) {
goto clear_rx_packet;
}
bool discovery = false;
bool ours = false;
mdns_srv_item_t * service = NULL;
mdns_parsed_record_type_t record_type = MDNS_ANSWER;
if (recordIndex >= (header.answers + header.servers)) {
record_type = MDNS_EXTRA;
} else if (recordIndex >= (header.answers)) {
record_type = MDNS_NS;
}
recordIndex++;
if (type == MDNS_TYPE_NSEC || type == MDNS_TYPE_OPT) {
//skip NSEC and OPT
continue;
}
if (parsed_packet->discovery && _mdns_name_is_discovery(name, type)) {
discovery = true;
} else if (!name->sub && _mdns_name_is_ours(name)) {
ours = true;
if (name->service && name->service[0] && name->proto && name->proto[0]) {
service = _mdns_get_service_item(name->service, name->proto, NULL);
}
} else {
if (!parsed_packet->authoritative || record_type == MDNS_NS) {
//skip this record
continue;
}
search_result = _mdns_search_find_from(_mdns_server->search_once, name, type, packet->tcpip_if, packet->ip_protocol);
}
if (type == MDNS_TYPE_PTR) {
if (!_mdns_parse_fqdn(data, data_ptr, name, len)) {
continue;//error
}
if (search_result) {
_mdns_search_result_add_ptr(search_result, name->host, name->service, name->proto,
packet->tcpip_if, packet->ip_protocol, ttl);
} else if ((discovery || ours) && !name->sub && _mdns_name_is_ours(name)) {
if (discovery && (service = _mdns_get_service_item(name->service, name->proto, NULL))) {
_mdns_remove_parsed_question(parsed_packet, MDNS_TYPE_SDPTR, service);
} else if (service && parsed_packet->questions && !parsed_packet->probe) {
_mdns_remove_parsed_question(parsed_packet, type, service);
} else if (service) {
//check if TTL is more than half of the full TTL value (4500)
if (ttl > 2250) {
_mdns_remove_scheduled_answer(packet->tcpip_if, packet->ip_protocol, type, service);
}
}
}
} else if (type == MDNS_TYPE_SRV) {
mdns_result_t * result = NULL;
if (search_result && search_result->type == MDNS_TYPE_PTR) {
result = search_result->result;
while (result) {
if (_mdns_get_esp_netif(packet->tcpip_if) == result->esp_netif
&& packet->ip_protocol == result->ip_protocol
&& result->instance_name && !strcmp(name->host, result->instance_name)) {
break;
}
result = result->next;
}
if (!result) {
result = _mdns_search_result_add_ptr(search_result, name->host, name->service, name->proto,
packet->tcpip_if, packet->ip_protocol, ttl);
if (!result) {
continue;//error
}
}
}
if (!_mdns_parse_fqdn(data, data_ptr + MDNS_SRV_FQDN_OFFSET, name, len)) {
continue;//error
}
if (data_ptr + MDNS_SRV_PORT_OFFSET + 1 >= data + len) {
goto clear_rx_packet; // malformed packet, won't read behind it
}
uint16_t priority = _mdns_read_u16(data_ptr, MDNS_SRV_PRIORITY_OFFSET);
uint16_t weight = _mdns_read_u16(data_ptr, MDNS_SRV_WEIGHT_OFFSET);
uint16_t port = _mdns_read_u16(data_ptr, MDNS_SRV_PORT_OFFSET);
if (search_result) {
if (search_result->type == MDNS_TYPE_PTR) {
if (!result->hostname) { // assign host/port for this entry only if not previously set
result->port = port;
result->hostname = strdup(name->host);
}
} else {
_mdns_search_result_add_srv(search_result, name->host, port, packet->tcpip_if, packet->ip_protocol, ttl);
}
} else if (ours) {
if (parsed_packet->questions && !parsed_packet->probe) {
_mdns_remove_parsed_question(parsed_packet, type, service);
continue;
} else if (parsed_packet->distributed) {
_mdns_remove_scheduled_answer(packet->tcpip_if, packet->ip_protocol, type, service);
continue;
}
//detect collision (-1=won, 0=none, 1=lost)
int col = 0;
if (mdns_class > 1) {
col = 1;
} else if (!mdns_class) {
col = -1;
} else if (service) { // only detect srv collision if service existed
col = _mdns_check_srv_collision(service->service, priority, weight, port, name->host, name->domain);
}
if (service && col && (parsed_packet->probe || parsed_packet->authoritative)) {
if (col > 0 || !port) {
do_not_reply = true;
if (_mdns_server->interfaces[packet->tcpip_if].pcbs[packet->ip_protocol].probe_running) {
_mdns_server->interfaces[packet->tcpip_if].pcbs[packet->ip_protocol].failed_probes++;
if (!_str_null_or_empty(service->service->instance)) {
char * new_instance = _mdns_mangle_name((char *)service->service->instance);
if (new_instance) {
free((char *)service->service->instance);
service->service->instance = new_instance;
}
_mdns_probe_all_pcbs(&service, 1, false, false);
} else if (!_str_null_or_empty(_mdns_server->instance)) {
char * new_instance = _mdns_mangle_name((char *)_mdns_server->instance);
if (new_instance) {
free((char *)_mdns_server->instance);
_mdns_server->instance = new_instance;
}
_mdns_restart_all_pcbs_no_instance();
} else {
char * new_host = _mdns_mangle_name((char *)_mdns_server->hostname);
if (new_host) {
_mdns_remap_self_service_hostname(_mdns_server->hostname, new_host);
free((char *)_mdns_server->hostname);
_mdns_server->hostname = new_host;
_mdns_self_host.hostname = new_host;
}
_mdns_restart_all_pcbs();
}
} else if (service) {
_mdns_pcb_send_bye(packet->tcpip_if, packet->ip_protocol, &service, 1, false);
_mdns_init_pcb_probe(packet->tcpip_if, packet->ip_protocol, &service, 1, false);
}
}
} else if (ttl > 60 && !col && !parsed_packet->authoritative && !parsed_packet->probe && !parsed_packet->questions) {
_mdns_remove_scheduled_answer(packet->tcpip_if, packet->ip_protocol, type, service);
}
}
} else if (type == MDNS_TYPE_TXT) {
if (search_result) {
mdns_txt_item_t * txt = NULL;
uint8_t *txt_value_len = NULL;
size_t txt_count = 0;
mdns_result_t * result = NULL;
if (search_result->type == MDNS_TYPE_PTR) {
result = search_result->result;
while (result) {
if (_mdns_get_esp_netif(packet->tcpip_if) == result->esp_netif
&& packet->ip_protocol == result->ip_protocol
&& result->instance_name && !strcmp(name->host, result->instance_name)) {
break;
}
result = result->next;
}
if (!result) {
result = _mdns_search_result_add_ptr(search_result, name->host, name->service, name->proto,
packet->tcpip_if, packet->ip_protocol, ttl);
if (!result) {
continue;//error
}
}
if (!result->txt) {
_mdns_result_txt_create(data_ptr, data_len, &txt, &txt_value_len, &txt_count);
if (txt_count) {
result->txt = txt;
result->txt_count = txt_count;
result->txt_value_len = txt_value_len;
}
}
} else {
_mdns_result_txt_create(data_ptr, data_len, &txt, &txt_value_len, &txt_count);
if (txt_count) {
_mdns_search_result_add_txt(search_result, txt, txt_value_len, txt_count, packet->tcpip_if, packet->ip_protocol, ttl);
}
}
} else if (ours) {
if (parsed_packet->questions && !parsed_packet->probe) {
_mdns_remove_parsed_question(parsed_packet, type, service);
continue;
}
//detect collision (-1=won, 0=none, 1=lost)
int col = 0;
if (mdns_class > 1) {
col = 1;
} else if (!mdns_class) {
col = -1;
} else if (service) { // only detect txt collision if service existed
col = _mdns_check_txt_collision(service->service, data_ptr, data_len);
}
if (col && !_mdns_server->interfaces[packet->tcpip_if].pcbs[packet->ip_protocol].probe_running && service) {
do_not_reply = true;
_mdns_init_pcb_probe(packet->tcpip_if, packet->ip_protocol, &service, 1, true);
} else if (ttl > 2250 && !col && !parsed_packet->authoritative && !parsed_packet->probe && !parsed_packet->questions && !_mdns_server->interfaces[packet->tcpip_if].pcbs[packet->ip_protocol].probe_running) {
_mdns_remove_scheduled_answer(packet->tcpip_if, packet->ip_protocol, type, service);
}
}
}
#if CONFIG_LWIP_IPV6
else if (type == MDNS_TYPE_AAAA) {//ipv6
esp_ip_addr_t ip6;
ip6.type = ESP_IPADDR_TYPE_V6;
memcpy(ip6.u_addr.ip6.addr, data_ptr, MDNS_ANSWER_AAAA_SIZE);
if (search_result) {
//check for more applicable searches (PTR & A/AAAA at the same time)
while (search_result) {
_mdns_search_result_add_ip(search_result, name->host, &ip6, packet->tcpip_if, packet->ip_protocol, ttl);
search_result = _mdns_search_find_from(search_result->next, name, type, packet->tcpip_if, packet->ip_protocol);
}
} else if (ours) {
if (parsed_packet->questions && !parsed_packet->probe) {
_mdns_remove_parsed_question(parsed_packet, type, NULL);
continue;
}
//detect collision (-1=won, 0=none, 1=lost)
int col = 0;
if (mdns_class > 1) {
col = 1;
} else if (!mdns_class) {
col = -1;
} else {
col = _mdns_check_aaaa_collision(&(ip6.u_addr.ip6), packet->tcpip_if);
}
if (col == 2) {
goto clear_rx_packet;
} else if (col == 1) {
do_not_reply = true;
if (_mdns_server->interfaces[packet->tcpip_if].pcbs[packet->ip_protocol].probe_running) {
if (col && (parsed_packet->probe || parsed_packet->authoritative)) {
_mdns_server->interfaces[packet->tcpip_if].pcbs[packet->ip_protocol].failed_probes++;
char * new_host = _mdns_mangle_name((char *)_mdns_server->hostname);
if (new_host) {
_mdns_remap_self_service_hostname(_mdns_server->hostname, new_host);
free((char *)_mdns_server->hostname);
_mdns_server->hostname = new_host;
_mdns_self_host.hostname = new_host;
}
_mdns_restart_all_pcbs();
}
} else {
_mdns_init_pcb_probe(packet->tcpip_if, packet->ip_protocol, NULL, 0, true);
}
} else if (ttl > 60 && !col && !parsed_packet->authoritative && !parsed_packet->probe && !parsed_packet->questions && !_mdns_server->interfaces[packet->tcpip_if].pcbs[packet->ip_protocol].probe_running) {
_mdns_remove_scheduled_answer(packet->tcpip_if, packet->ip_protocol, type, NULL);
}
}
}
#endif
else if (type == MDNS_TYPE_A) {
esp_ip_addr_t ip;
ip.type = ESP_IPADDR_TYPE_V4;
memcpy(&(ip.u_addr.ip4.addr), data_ptr, 4);
if (search_result) {
//check for more applicable searches (PTR & A/AAAA at the same time)
while (search_result) {
_mdns_search_result_add_ip(search_result, name->host, &ip, packet->tcpip_if, packet->ip_protocol, ttl);
search_result = _mdns_search_find_from(search_result->next, name, type, packet->tcpip_if, packet->ip_protocol);
}
} else if (ours) {
if (parsed_packet->questions && !parsed_packet->probe) {
_mdns_remove_parsed_question(parsed_packet, type, NULL);
continue;
}
//detect collision (-1=won, 0=none, 1=lost)
int col = 0;
if (mdns_class > 1) {
col = 1;
} else if (!mdns_class) {
col = -1;
} else {
col = _mdns_check_a_collision(&(ip.u_addr.ip4), packet->tcpip_if);
}
if (col == 2) {
goto clear_rx_packet;
} else if (col == 1) {
do_not_reply = true;
if (_mdns_server->interfaces[packet->tcpip_if].pcbs[packet->ip_protocol].probe_running) {
if (col && (parsed_packet->probe || parsed_packet->authoritative)) {
_mdns_server->interfaces[packet->tcpip_if].pcbs[packet->ip_protocol].failed_probes++;
char * new_host = _mdns_mangle_name((char *)_mdns_server->hostname);
if (new_host) {
_mdns_remap_self_service_hostname(_mdns_server->hostname, new_host);
free((char *)_mdns_server->hostname);
_mdns_server->hostname = new_host;
_mdns_self_host.hostname = new_host;
}
_mdns_restart_all_pcbs();
}
} else {
_mdns_init_pcb_probe(packet->tcpip_if, packet->ip_protocol, NULL, 0, true);
}
} else if (ttl > 60 && !col && !parsed_packet->authoritative && !parsed_packet->probe && !parsed_packet->questions && !_mdns_server->interfaces[packet->tcpip_if].pcbs[packet->ip_protocol].probe_running) {
_mdns_remove_scheduled_answer(packet->tcpip_if, packet->ip_protocol, type, NULL);
}
}
}
}
//end while
if (parsed_packet->authoritative) {
_mdns_search_finish_done();
}
}
if (!do_not_reply && _mdns_server->interfaces[packet->tcpip_if].pcbs[packet->ip_protocol].state > PCB_PROBE_3 && (parsed_packet->questions || parsed_packet->discovery)) {
_mdns_create_answer_from_parsed_packet(parsed_packet);
}
clear_rx_packet:
while (parsed_packet->questions) {
mdns_parsed_question_t * question = parsed_packet->questions;
parsed_packet->questions = parsed_packet->questions->next;
if (question->host) {
free(question->host);
}
if (question->service) {
free(question->service);
}
if (question->proto) {
free(question->proto);
}
if (question->domain) {
free(question->domain);
}
free(question);
}
free(parsed_packet);
}
/**
* @brief Enable mDNS interface
*/
void _mdns_enable_pcb(mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
{
if (!_mdns_server->interfaces[tcpip_if].pcbs[ip_protocol].pcb) {
if (_mdns_pcb_init(tcpip_if, ip_protocol)) {
return;
}
}
_mdns_restart_pcb(tcpip_if, ip_protocol);
}
/**
* @brief Disable mDNS interface
*/
void _mdns_disable_pcb(mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
{
_mdns_clean_netif_ptr(tcpip_if);
if (_mdns_server->interfaces[tcpip_if].pcbs[ip_protocol].pcb) {
_mdns_clear_pcb_tx_queue_head(tcpip_if, ip_protocol);
_mdns_pcb_deinit(tcpip_if, ip_protocol);
mdns_if_t other_if = _mdns_get_other_if (tcpip_if);
if (other_if != MDNS_MAX_INTERFACES && _mdns_server->interfaces[other_if].pcbs[ip_protocol].state == PCB_DUP) {
_mdns_server->interfaces[other_if].pcbs[ip_protocol].state = PCB_OFF;
_mdns_enable_pcb(other_if, ip_protocol);
}
}
_mdns_server->interfaces[tcpip_if].pcbs[ip_protocol].state = PCB_OFF;
}
/**
* @brief Performs interface changes based on system events or custom commands
*/
static void perform_event_action(mdns_if_t mdns_if, mdns_event_actions_t action)
{
if (!_mdns_server || mdns_if >= MDNS_MAX_INTERFACES) {
return;
}
if (action & MDNS_EVENT_ENABLE_IP4) {
_mdns_enable_pcb(mdns_if, MDNS_IP_PROTOCOL_V4);
}
if (action & MDNS_EVENT_ENABLE_IP6) {
_mdns_enable_pcb(mdns_if, MDNS_IP_PROTOCOL_V6);
}
if (action & MDNS_EVENT_DISABLE_IP4) {
_mdns_disable_pcb(mdns_if, MDNS_IP_PROTOCOL_V4);
}
if (action & MDNS_EVENT_DISABLE_IP6) {
_mdns_disable_pcb(mdns_if, MDNS_IP_PROTOCOL_V6);
}
if (action & MDNS_EVENT_ANNOUNCE_IP4) {
_mdns_announce_pcb(mdns_if, MDNS_IP_PROTOCOL_V4, NULL, 0, true);
}
if (action & MDNS_EVENT_ANNOUNCE_IP6) {
_mdns_announce_pcb(mdns_if, MDNS_IP_PROTOCOL_V6, NULL, 0, true);
}
}
/**
* @brief Dispatch interface changes based on system events
*/
static inline void post_mdns_disable_pcb(mdns_predef_if_t preset_if, mdns_ip_protocol_t protocol)
{
mdns_post_custom_action_tcpip_if(mdns_if_from_preset_if(preset_if), protocol == MDNS_IP_PROTOCOL_V4 ? MDNS_EVENT_DISABLE_IP4 : MDNS_EVENT_DISABLE_IP6);
}
static inline void post_mdns_enable_pcb(mdns_predef_if_t preset_if, mdns_ip_protocol_t protocol)
{
mdns_post_custom_action_tcpip_if(mdns_if_from_preset_if(preset_if), protocol == MDNS_IP_PROTOCOL_V4 ? MDNS_EVENT_ENABLE_IP4 : MDNS_EVENT_ENABLE_IP6);
}
static inline void post_mdns_announce_pcb(mdns_predef_if_t preset_if, mdns_ip_protocol_t protocol)
{
mdns_post_custom_action_tcpip_if(mdns_if_from_preset_if(preset_if), protocol == MDNS_IP_PROTOCOL_V4 ? MDNS_EVENT_ANNOUNCE_IP4 : MDNS_EVENT_ANNOUNCE_IP6);
}
void mdns_preset_if_handle_system_event(void *arg, esp_event_base_t event_base,
int32_t event_id, void *event_data)
{
if (!_mdns_server) {
return;
}
esp_netif_dhcp_status_t dcst;
if (event_base == WIFI_EVENT) {
switch(event_id) {
case WIFI_EVENT_STA_CONNECTED:
if (!esp_netif_dhcpc_get_status(esp_netif_from_preset_if(MDNS_IF_STA), &dcst)) {
if (dcst == ESP_NETIF_DHCP_STOPPED) {
post_mdns_enable_pcb(MDNS_IF_STA, MDNS_IP_PROTOCOL_V4);
}
}
break;
case WIFI_EVENT_STA_DISCONNECTED:
post_mdns_disable_pcb(MDNS_IF_STA, MDNS_IP_PROTOCOL_V4);
post_mdns_disable_pcb(MDNS_IF_STA, MDNS_IP_PROTOCOL_V6);
break;
case WIFI_EVENT_AP_START:
post_mdns_enable_pcb(MDNS_IF_AP, MDNS_IP_PROTOCOL_V4);
break;
case WIFI_EVENT_AP_STOP:
post_mdns_disable_pcb(MDNS_IF_AP, MDNS_IP_PROTOCOL_V4);
post_mdns_disable_pcb(MDNS_IF_AP, MDNS_IP_PROTOCOL_V6);
break;
default:
break;
}
}
#if CONFIG_ETH_ENABLED
else if (event_base == ETH_EVENT) {
switch (event_id) {
case ETHERNET_EVENT_CONNECTED:
if (!esp_netif_dhcpc_get_status(esp_netif_from_preset_if(MDNS_IF_ETH), &dcst)) {
if (dcst == ESP_NETIF_DHCP_STOPPED) {
post_mdns_enable_pcb(MDNS_IF_ETH, MDNS_IP_PROTOCOL_V4);
}
}
break;
case ETHERNET_EVENT_DISCONNECTED:
post_mdns_disable_pcb(MDNS_IF_ETH, MDNS_IP_PROTOCOL_V4);
post_mdns_disable_pcb(MDNS_IF_ETH, MDNS_IP_PROTOCOL_V6);
break;
default:
break;
}
}
#endif
else if (event_base == IP_EVENT) {
switch (event_id) {
case IP_EVENT_STA_GOT_IP:
post_mdns_enable_pcb(MDNS_IF_STA, MDNS_IP_PROTOCOL_V4);
post_mdns_announce_pcb(MDNS_IF_STA, MDNS_IP_PROTOCOL_V6);
break;
#if CONFIG_ETH_ENABLED
case IP_EVENT_ETH_GOT_IP:
post_mdns_enable_pcb(MDNS_IF_ETH, MDNS_IP_PROTOCOL_V4);
break;
#endif
case IP_EVENT_GOT_IP6:
{
ip_event_got_ip6_t* event = (ip_event_got_ip6_t*) event_data;
mdns_if_t mdns_if = _mdns_get_if_from_esp_netif(event->esp_netif);
if (mdns_if < MDNS_MAX_INTERFACES) {
post_mdns_enable_pcb(mdns_if, MDNS_IP_PROTOCOL_V6);
post_mdns_announce_pcb(mdns_if, MDNS_IP_PROTOCOL_V4);
}
}
break;
default:
break;
}
}
}
/*
* MDNS Search
* */
/**
* @brief Free search structure (except the results)
*/
static void _mdns_search_free(mdns_search_once_t * search)
{
free(search->instance);
free(search->service);
free(search->proto);
vSemaphoreDelete(search->done_semaphore);
free(search);
}
/**
* @brief Allocate new search structure
*/
static mdns_search_once_t *_mdns_search_init(const char *name, const char *service, const char *proto, uint16_t type, bool unicast,
uint32_t timeout, uint8_t max_results, mdns_query_notify_t notifier)
{
mdns_search_once_t * search = (mdns_search_once_t *)malloc(sizeof(mdns_search_once_t));
if (!search) {
HOOK_MALLOC_FAILED;
return NULL;
}
memset(search, 0, sizeof(mdns_search_once_t));
search->done_semaphore = xSemaphoreCreateBinary();
if (!search->done_semaphore) {
free(search);
return NULL;
}
if (!_str_null_or_empty(name)) {
search->instance = strndup(name, MDNS_NAME_BUF_LEN-1);
if (!search->instance) {
_mdns_search_free(search);
return NULL;
}
}
if (!_str_null_or_empty(service)) {
search->service = strndup(service, MDNS_NAME_BUF_LEN-1);
if (!search->service) {
_mdns_search_free(search);
return NULL;
}
}
if (!_str_null_or_empty(proto)) {
search->proto = strndup(proto, MDNS_NAME_BUF_LEN-1);
if (!search->proto) {
_mdns_search_free(search);
return NULL;
}
}
search->type = type;
search->unicast = unicast;
search->timeout = timeout;
search->num_results = 0;
search->max_results = max_results;
search->result = NULL;
search->state = SEARCH_INIT;
search->sent_at = 0;
search->started_at = xTaskGetTickCount() * portTICK_PERIOD_MS;
search->notifier = notifier;
search->next = NULL;
return search;
}
/**
* @brief Mark search as finished and remove it from search chain
*/
static void _mdns_search_finish(mdns_search_once_t * search)
{
search->state = SEARCH_OFF;
queueDetach(mdns_search_once_t, _mdns_server->search_once, search);
if (search->notifier) {
search->notifier(search);
}
xSemaphoreGive(search->done_semaphore);
}
/**
* @brief Add new search to the search chain
*/
static void _mdns_search_add(mdns_search_once_t * search)
{
search->next = _mdns_server->search_once;
_mdns_server->search_once = search;
}
/**
* @brief Called from parser to finish any searches that have reached maximum results
*/
static void _mdns_search_finish_done(void)
{
mdns_search_once_t * search = _mdns_server->search_once;
mdns_search_once_t * s = NULL;
while (search) {
s = search;
search = search->next;
if (s->max_results && s->num_results >= s->max_results) {
_mdns_search_finish(s);
}
}
}
/**
* @brief Create linked IP (copy) from parsed one
*/
static mdns_ip_addr_t * _mdns_result_addr_create_ip(esp_ip_addr_t * ip)
{
mdns_ip_addr_t * a = (mdns_ip_addr_t *)malloc(sizeof(mdns_ip_addr_t));
if (!a) {
HOOK_MALLOC_FAILED;
return NULL;
}
memset(a, 0 , sizeof(mdns_ip_addr_t));
a->addr.type = ip->type;
if (ip->type == ESP_IPADDR_TYPE_V6) {
memcpy(a->addr.u_addr.ip6.addr, ip->u_addr.ip6.addr, 16);
} else {
a->addr.u_addr.ip4.addr = ip->u_addr.ip4.addr;
}
return a;
}
static inline void _mdns_result_update_ttl(mdns_result_t * r, uint32_t ttl)
{
r->ttl = r->ttl < ttl ? r->ttl : ttl;
}
/**
* @brief Chain new IP to search result
*/
static void _mdns_result_add_ip(mdns_result_t * r, esp_ip_addr_t * ip)
{
mdns_ip_addr_t * a = r->addr;
while (a) {
if (a->addr.type == ip->type) {
if (a->addr.type == ESP_IPADDR_TYPE_V4 && a->addr.u_addr.ip4.addr == ip->u_addr.ip4.addr) {
return;
}
if (a->addr.type == ESP_IPADDR_TYPE_V6 && !memcmp(a->addr.u_addr.ip6.addr, ip->u_addr.ip6.addr, 16)) {
return;
}
}
a = a->next;
}
a = _mdns_result_addr_create_ip(ip);
if (!a) {
return;
}
a->next = r->addr;
r->addr = a;
}
/**
* @brief Called from parser to add A/AAAA data to search result
*/
static void _mdns_search_result_add_ip(mdns_search_once_t * search, const char * hostname, esp_ip_addr_t * ip,
mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol, uint32_t ttl)
{
mdns_result_t * r = NULL;
mdns_ip_addr_t * a = NULL;
if ((search->type == MDNS_TYPE_A && ip->type == ESP_IPADDR_TYPE_V4)
|| (search->type == MDNS_TYPE_AAAA && ip->type == ESP_IPADDR_TYPE_V6)
|| search->type == MDNS_TYPE_ANY) {
r = search->result;
while (r) {
if (r->esp_netif == _mdns_get_esp_netif(tcpip_if) && r->ip_protocol == ip_protocol) {
_mdns_result_add_ip(r, ip);
_mdns_result_update_ttl(r, ttl);
return;
}
r = r->next;
}
if (!search->max_results || search->num_results < search->max_results) {
r = (mdns_result_t *)malloc(sizeof(mdns_result_t));
if (!r) {
HOOK_MALLOC_FAILED;
return;
}
memset(r, 0 , sizeof(mdns_result_t));
a = _mdns_result_addr_create_ip(ip);
if (!a) {
free(r);
return;
}
a->next = r->addr;
r->hostname = strdup(hostname);
r->addr = a;
r->esp_netif = _mdns_get_esp_netif(tcpip_if);
r->ip_protocol = ip_protocol;
r->next = search->result;
r->ttl = ttl;
search->result = r;
search->num_results++;
}
} else if (search->type == MDNS_TYPE_PTR || search->type == MDNS_TYPE_SRV) {
r = search->result;
while (r) {
if (r->esp_netif == _mdns_get_esp_netif(tcpip_if) && r->ip_protocol == ip_protocol && !_str_null_or_empty(r->hostname) && !strcasecmp(hostname, r->hostname)) {
_mdns_result_add_ip(r, ip);
_mdns_result_update_ttl(r, ttl);
break;
}
r = r->next;
}
}
}
/**
* @brief Called from parser to add PTR data to search result
*/
static mdns_result_t * _mdns_search_result_add_ptr(mdns_search_once_t * search, const char * instance,
const char * service_type, const char * proto, mdns_if_t tcpip_if,
mdns_ip_protocol_t ip_protocol, uint32_t ttl)
{
mdns_result_t * r = search->result;
while (r) {
if (r->esp_netif == _mdns_get_esp_netif(tcpip_if) && r->ip_protocol == ip_protocol && !_str_null_or_empty(r->instance_name) && !strcasecmp(instance, r->instance_name)) {
_mdns_result_update_ttl(r, ttl);
return r;
}
r = r->next;
}
if (!search->max_results || search->num_results < search->max_results) {
r = (mdns_result_t *)malloc(sizeof(mdns_result_t));
if (!r) {
HOOK_MALLOC_FAILED;
return NULL;
}
memset(r, 0 , sizeof(mdns_result_t));
r->instance_name = strdup(instance);
r->service_type = strdup(service_type);
r->proto = strdup(proto);
if (!r->instance_name) {
free(r);
return NULL;
}
r->esp_netif = _mdns_get_esp_netif(tcpip_if);
r->ip_protocol = ip_protocol;
r->ttl = ttl;
r->next = search->result;
search->result = r;
search->num_results++;
return r;
}
return NULL;
}
/**
* @brief Called from parser to add SRV data to search result
*/
static void _mdns_search_result_add_srv(mdns_search_once_t *search, const char *hostname, uint16_t port,
mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol, uint32_t ttl)
{
mdns_result_t * r = search->result;
while (r) {
if (r->esp_netif == _mdns_get_esp_netif(tcpip_if) && r->ip_protocol == ip_protocol && !_str_null_or_empty(r->hostname) && !strcasecmp(hostname, r->hostname)) {
_mdns_result_update_ttl(r, ttl);
return;
}
r = r->next;
}
if (!search->max_results || search->num_results < search->max_results) {
r = (mdns_result_t *)malloc(sizeof(mdns_result_t));
if (!r) {
HOOK_MALLOC_FAILED;
return;
}
memset(r, 0 , sizeof(mdns_result_t));
r->hostname = strdup(hostname);
if (!r->hostname) {
free(r);
return;
}
if (search->instance) {
r->instance_name = strdup(search->instance);
}
r->service_type = strdup(search->service);
r->proto = strdup(search->proto);
r->port = port;
r->esp_netif = _mdns_get_esp_netif(tcpip_if);
r->ip_protocol = ip_protocol;
r->ttl = ttl;
r->next = search->result;
search->result = r;
search->num_results++;
}
}
/**
* @brief Called from parser to add TXT data to search result
*/
static void _mdns_search_result_add_txt(mdns_search_once_t *search, mdns_txt_item_t *txt, uint8_t *txt_value_len,
size_t txt_count, mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol,
uint32_t ttl)
{
mdns_result_t * r = search->result;
while (r) {
if (r->esp_netif == _mdns_get_esp_netif(tcpip_if) && r->ip_protocol == ip_protocol) {
if (r->txt) {
goto free_txt;
}
r->txt = txt;
r->txt_value_len = txt_value_len;
r->txt_count = txt_count;
_mdns_result_update_ttl(r, ttl);
return;
}
r = r->next;
}
if (!search->max_results || search->num_results < search->max_results) {
r = (mdns_result_t *)malloc(sizeof(mdns_result_t));
if (!r) {
HOOK_MALLOC_FAILED;
goto free_txt;
}
memset(r, 0 , sizeof(mdns_result_t));
r->txt = txt;
r->txt_value_len = txt_value_len;
r->txt_count = txt_count;
r->esp_netif = _mdns_get_esp_netif(tcpip_if);
r->ip_protocol = ip_protocol;
r->ttl = ttl;
r->next = search->result;
search->result = r;
search->num_results++;
}
return;
free_txt:
for (size_t i=0; i<txt_count; i++) {
free((char *)(txt[i].key));
free((char *)(txt[i].value));
}
free(txt);
}
/**
* @brief Called from packet parser to find matching running search
*/
static mdns_search_once_t * _mdns_search_find_from(mdns_search_once_t * s, mdns_name_t * name, uint16_t type, mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
{
mdns_result_t * r = NULL;
while (s) {
if (s->state == SEARCH_OFF) {
s = s->next;
continue;
}
if (type == MDNS_TYPE_A || type == MDNS_TYPE_AAAA) {
if ((s->type == MDNS_TYPE_ANY && s->service != NULL)
|| (s->type != MDNS_TYPE_ANY && s->type != type && s->type != MDNS_TYPE_PTR && s->type != MDNS_TYPE_SRV))
{
s = s->next;
continue;
}
if (s->type != MDNS_TYPE_PTR && s->type != MDNS_TYPE_SRV) {
if (!strcasecmp(name->host, s->instance)) {
return s;
}
s = s->next;
continue;
}
r = s->result;
while (r) {
if (r->esp_netif == _mdns_get_esp_netif(tcpip_if) && r->ip_protocol == ip_protocol && !_str_null_or_empty(r->hostname) && !strcasecmp(name->host, r->hostname)) {
return s;
}
r = r->next;
}
s = s->next;
continue;
}
if (type == MDNS_TYPE_SRV || type == MDNS_TYPE_TXT) {
if ((s->type == MDNS_TYPE_ANY && s->service == NULL)
|| (s->type != MDNS_TYPE_ANY && s->type != type && s->type != MDNS_TYPE_PTR))
{
s = s->next;
continue;
}
if (strcasecmp(name->service, s->service)
|| strcasecmp(name->proto, s->proto))
{
s = s->next;
continue;
}
if (s->type != MDNS_TYPE_PTR) {
if (s->instance && strcasecmp(name->host, s->instance) == 0) {
return s;
}
s = s->next;
continue;
}
return s;
}
if (type == MDNS_TYPE_PTR && type == s->type && !strcasecmp(name->service, s->service) && !strcasecmp(name->proto, s->proto)) {
return s;
}
s = s->next;
}
return NULL;
}
/**
* @brief Create search packet for particular interface
*/
static mdns_tx_packet_t * _mdns_create_search_packet(mdns_search_once_t * search, mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
{
mdns_result_t * r = NULL;
mdns_tx_packet_t * packet = _mdns_alloc_packet_default(tcpip_if, ip_protocol);
if (!packet) {
return NULL;
}
mdns_out_question_t * q = (mdns_out_question_t *)malloc(sizeof(mdns_out_question_t));
if (!q) {
HOOK_MALLOC_FAILED;
_mdns_free_tx_packet(packet);
return NULL;
}
q->next = NULL;
q->unicast = search->unicast;
q->type = search->type;
q->host = search->instance;
q->service = search->service;
q->proto = search->proto;
q->domain = MDNS_DEFAULT_DOMAIN;
q->own_dynamic_memory = false;
queueToEnd(mdns_out_question_t, packet->questions, q);
if (search->type == MDNS_TYPE_PTR) {
r = search->result;
while (r) {
//full record on the same interface is available
if (r->esp_netif != _mdns_get_esp_netif(tcpip_if) || r->ip_protocol != ip_protocol || r->instance_name == NULL || r->hostname == NULL || r->addr == NULL) {
r = r->next;
continue;
}
mdns_out_answer_t * a = (mdns_out_answer_t *)malloc(sizeof(mdns_out_answer_t));
if (!a) {
HOOK_MALLOC_FAILED;
_mdns_free_tx_packet(packet);
return NULL;
}
a->type = MDNS_TYPE_PTR;
a->service = NULL;
a->custom_instance = r->instance_name;
a->custom_service = search->service;
a->custom_proto = search->proto;
a->bye = false;
a->flush = false;
a->next = NULL;
queueToEnd(mdns_out_answer_t, packet->answers, a);
r = r->next;
}
}
return packet;
}
/**
* @brief Send search packet to particular interface
*/
static void _mdns_search_send_pcb(mdns_search_once_t * search, mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
{
mdns_tx_packet_t * packet = NULL;
if (_mdns_server->interfaces[tcpip_if].pcbs[ip_protocol].pcb && _mdns_server->interfaces[tcpip_if].pcbs[ip_protocol].state > PCB_INIT) {
packet = _mdns_create_search_packet(search, tcpip_if, ip_protocol);
if (!packet) {
return;
}
_mdns_dispatch_tx_packet(packet);
_mdns_free_tx_packet(packet);
}
}
/**
* @brief Send search packet to all available interfaces
*/
static void _mdns_search_send(mdns_search_once_t * search)
{
mdns_search_once_t* queue = _mdns_server->search_once;
bool found = false;
// looking for this search in active searches
while (queue) {
if (queue == search) {
found = true;
break;
}
queue = queue->next;
}
if (!found) {
// no longer active -> skip sending this search
return;
}
uint8_t i, j;
for (i=0; i<MDNS_MAX_INTERFACES; i++) {
for (j=0; j<MDNS_IP_PROTOCOL_MAX; j++) {
_mdns_search_send_pcb(search, (mdns_if_t)i, (mdns_ip_protocol_t)j);
}
}
}
static void _mdns_tx_handle_packet(mdns_tx_packet_t * p)
{
mdns_tx_packet_t * a = NULL;
mdns_out_question_t * q = NULL;
mdns_pcb_t * pcb = &_mdns_server->interfaces[p->tcpip_if].pcbs[p->ip_protocol];
uint32_t send_after = 1000;
if (pcb->state == PCB_OFF) {
_mdns_free_tx_packet(p);
return;
}
_mdns_dispatch_tx_packet(p);
switch(pcb->state) {
case PCB_PROBE_1:
q = p->questions;
while (q) {
q->unicast = false;
q = q->next;
}
//fallthrough
case PCB_PROBE_2:
_mdns_schedule_tx_packet(p, 250);
pcb->state = (mdns_pcb_state_t)((uint8_t)(pcb->state) + 1);
break;
case PCB_PROBE_3:
a = _mdns_create_announce_from_probe(p);
if (!a) {
_mdns_schedule_tx_packet(p, 250);
break;
}
pcb->probe_running = false;
pcb->probe_ip = false;
pcb->probe_services_len = 0;
pcb->failed_probes = 0;
free(pcb->probe_services);
pcb->probe_services = NULL;
_mdns_free_tx_packet(p);
p = a;
send_after = 250;
//fallthrough
case PCB_ANNOUNCE_1:
//fallthrough
case PCB_ANNOUNCE_2:
_mdns_schedule_tx_packet(p, send_after);
pcb->state = (mdns_pcb_state_t)((uint8_t)(pcb->state) + 1);
break;
case PCB_ANNOUNCE_3:
pcb->state = PCB_RUNNING;
_mdns_free_tx_packet(p);
break;
default:
_mdns_free_tx_packet(p);
break;
}
}
static void _mdns_remap_self_service_hostname(const char * old_hostname, const char * new_hostname)
{
mdns_srv_item_t * service = _mdns_server->services;
while (service) {
if (strcmp(service->service->hostname, old_hostname) == 0) {
free((char *)service->service->hostname);
service->service->hostname = strdup(new_hostname);
}
service = service->next;
}
}
/**
* @brief Free action data
*/
static void _mdns_free_action(mdns_action_t * action)
{
switch(action->type) {
case ACTION_HOSTNAME_SET:
free(action->data.hostname_set.hostname);
break;
case ACTION_INSTANCE_SET:
free(action->data.instance);
break;
case ACTION_SERVICE_ADD:
_mdns_free_service(action->data.srv_add.service->service);
free(action->data.srv_add.service);
break;
case ACTION_SERVICE_INSTANCE_SET:
free(action->data.srv_instance.instance);
break;
case ACTION_SERVICE_TXT_REPLACE:
_mdns_free_linked_txt(action->data.srv_txt_replace.txt);
break;
case ACTION_SERVICE_TXT_SET:
free(action->data.srv_txt_set.key);
free(action->data.srv_txt_set.value);
break;
case ACTION_SERVICE_TXT_DEL:
free(action->data.srv_txt_del.key);
break;
case ACTION_SERVICE_SUBTYPE_ADD:
free(action->data.srv_subtype_add.subtype);
break;
case ACTION_SEARCH_ADD:
//fallthrough
case ACTION_SEARCH_SEND:
//fallthrough
case ACTION_SEARCH_END:
_mdns_search_free(action->data.search_add.search);
break;
case ACTION_TX_HANDLE:
_mdns_free_tx_packet(action->data.tx_handle.packet);
break;
case ACTION_RX_HANDLE:
_mdns_packet_free(action->data.rx_handle.packet);
break;
case ACTION_DELEGATE_HOSTNAME_ADD:
free((char *)action->data.delegate_hostname.hostname);
free_address_list(action->data.delegate_hostname.address_list);
break;
case ACTION_DELEGATE_HOSTNAME_REMOVE:
free((char *)action->data.delegate_hostname.hostname);
break;
default:
break;
}
free(action);
}
/**
* @brief Called from service thread to execute given action
*/
static void _mdns_execute_action(mdns_action_t * action)
{
mdns_srv_item_t * a = NULL;
mdns_service_t * service;
char * key;
char * value;
char *subtype;
mdns_subtype_t *subtype_item;
mdns_txt_linked_item_t * txt, * t;
switch(action->type) {
case ACTION_SYSTEM_EVENT:
perform_event_action(action->data.sys_event.interface, action->data.sys_event.event_action);
break;
case ACTION_HOSTNAME_SET:
_mdns_send_bye_all_pcbs_no_instance(true);
_mdns_remap_self_service_hostname(_mdns_server->hostname, action->data.hostname_set.hostname);
free((char*)_mdns_server->hostname);
_mdns_server->hostname = action->data.hostname_set.hostname;
_mdns_self_host.hostname = action->data.hostname_set.hostname;
_mdns_restart_all_pcbs();
xTaskNotifyGive(action->data.hostname_set.calling_task);
break;
case ACTION_INSTANCE_SET:
_mdns_send_bye_all_pcbs_no_instance(false);
free((char*)_mdns_server->instance);
_mdns_server->instance = action->data.instance;
_mdns_restart_all_pcbs_no_instance();
break;
case ACTION_SERVICE_ADD:
action->data.srv_add.service->next = _mdns_server->services;
_mdns_server->services = action->data.srv_add.service;
_mdns_probe_all_pcbs(&action->data.srv_add.service, 1, false, false);
break;
case ACTION_SERVICE_INSTANCE_SET:
if (action->data.srv_instance.service->service->instance) {
_mdns_send_bye(&action->data.srv_instance.service, 1, false);
free((char*)action->data.srv_instance.service->service->instance);
}
action->data.srv_instance.service->service->instance = action->data.srv_instance.instance;
_mdns_probe_all_pcbs(&action->data.srv_instance.service, 1, false, false);
break;
case ACTION_SERVICE_PORT_SET:
action->data.srv_port.service->service->port = action->data.srv_port.port;
_mdns_announce_all_pcbs(&action->data.srv_port.service, 1, true);
break;
case ACTION_SERVICE_TXT_REPLACE:
service = action->data.srv_txt_replace.service->service;
txt = service->txt;
service->txt = NULL;
_mdns_free_linked_txt(txt);
service->txt = action->data.srv_txt_replace.txt;
_mdns_announce_all_pcbs(&action->data.srv_txt_replace.service, 1, false);
break;
case ACTION_SERVICE_TXT_SET:
service = action->data.srv_txt_set.service->service;
key = action->data.srv_txt_set.key;
value = action->data.srv_txt_set.value;
txt = service->txt;
while (txt) {
if (strcmp(txt->key, key) == 0) {
free((char *)txt->value);
free(key);
txt->value = value;
txt->value_len = action->data.srv_txt_set.value_len;
break;
}
txt = txt->next;
}
if (!txt) {
txt = (mdns_txt_linked_item_t *)malloc(sizeof(mdns_txt_linked_item_t));
if (!txt) {
HOOK_MALLOC_FAILED;
_mdns_free_action(action);
return;
}
txt->key = key;
txt->value = value;
txt->value_len = action->data.srv_txt_set.value_len;
txt->next = service->txt;
service->txt = txt;
}
_mdns_announce_all_pcbs(&action->data.srv_txt_set.service, 1, false);
break;
case ACTION_SERVICE_TXT_DEL:
service = action->data.srv_txt_del.service->service;
key = action->data.srv_txt_del.key;
txt = service->txt;
if (!txt) {
break;
}
if (strcmp(txt->key, key) == 0) {
service->txt = txt->next;
free((char *)txt->key);
free((char *)txt->value);
free(txt);
} else {
while (txt->next) {
if (strcmp(txt->next->key, key) == 0) {
t = txt->next;
txt->next = t->next;
free((char *)t->key);
free((char *)t->value);
free(t);
break;
} else {
txt = txt->next;
}
}
}
free(key);
_mdns_announce_all_pcbs(&action->data.srv_txt_set.service, 1, false);
break;
case ACTION_SERVICE_SUBTYPE_ADD:
service = action->data.srv_subtype_add.service->service;
subtype = action->data.srv_subtype_add.subtype;
subtype_item = (mdns_subtype_t *)malloc(sizeof(mdns_subtype_t));
if (!subtype_item) {
HOOK_MALLOC_FAILED;
_mdns_free_action(action);
return;
}
subtype_item->subtype = subtype;
subtype_item->next = service->subtype;
service->subtype = subtype_item;
break;
case ACTION_SERVICE_DEL:
a = _mdns_server->services;
if (action->data.srv_del.service) {
if (_mdns_server->services == action->data.srv_del.service) {
_mdns_server->services = a->next;
_mdns_send_bye(&a, 1, false);
_mdns_remove_scheduled_service_packets(a->service);
_mdns_free_service(a->service);
free(a);
} else {
while (a->next && a->next != action->data.srv_del.service) {
a = a->next;
}
if (a->next == action->data.srv_del.service) {
mdns_srv_item_t * b = a->next;
a->next = a->next->next;
_mdns_send_bye(&b, 1, false);
_mdns_remove_scheduled_service_packets(b->service);
_mdns_free_service(b->service);
free(b);
}
}
}
break;
case ACTION_SERVICES_CLEAR:
_mdns_send_final_bye(false);
a = _mdns_server->services;
_mdns_server->services = NULL;
while (a) {
mdns_srv_item_t * s = a;
a = a->next;
_mdns_remove_scheduled_service_packets(s->service);
_mdns_free_service(s->service);
free(s);
}
break;
case ACTION_SEARCH_ADD:
_mdns_search_add(action->data.search_add.search);
break;
case ACTION_SEARCH_SEND:
_mdns_search_send(action->data.search_add.search);
break;
case ACTION_SEARCH_END:
_mdns_search_finish(action->data.search_add.search);
break;
case ACTION_TX_HANDLE:
{
mdns_tx_packet_t * p = _mdns_server->tx_queue_head;
// packet to be handled should be at tx head, but must be consistent with the one pushed to action queue
if (p && p==action->data.tx_handle.packet && p->queued) {
p->queued = false; // clearing, as the packet might be reused (pushed and transmitted again)
_mdns_server->tx_queue_head = p->next;
_mdns_tx_handle_packet(p);
} else {
ESP_LOGD(TAG, "Skipping transmit of an unexpected packet!");
}
}
break;
case ACTION_RX_HANDLE:
mdns_parse_packet(action->data.rx_handle.packet);
_mdns_packet_free(action->data.rx_handle.packet);
break;
case ACTION_DELEGATE_HOSTNAME_ADD:
if (!_mdns_delegate_hostname_add(action->data.delegate_hostname.hostname,
action->data.delegate_hostname.address_list)) {
free((char *)action->data.delegate_hostname.hostname);
free_address_list(action->data.delegate_hostname.address_list);
}
break;
case ACTION_DELEGATE_HOSTNAME_REMOVE:
_mdns_delegate_hostname_remove(action->data.delegate_hostname.hostname);
free((char *)action->data.delegate_hostname.hostname);
break;
default:
break;
}
free(action);
}
/**
* @brief Queue search action
*/
static esp_err_t _mdns_send_search_action(mdns_action_type_t type, mdns_search_once_t * search)
{
mdns_action_t * action = NULL;
action = (mdns_action_t *)malloc(sizeof(mdns_action_t));
if (!action) {
HOOK_MALLOC_FAILED;
return ESP_ERR_NO_MEM;
}
action->type = type;
action->data.search_add.search = search;
if (xQueueSend(_mdns_server->action_queue, &action, (TickType_t)0) != pdPASS) {
free(action);
return ESP_ERR_NO_MEM;
}
return ESP_OK;
}
/**
* @brief Called from timer task to run mDNS responder
*
* periodically checks first unqueued packet (from tx head).
* if it is scheduled to be transmitted, then pushes the packet to action queue to be handled.
*
*/
static void _mdns_scheduler_run(void)
{
MDNS_SERVICE_LOCK();
mdns_tx_packet_t * p = _mdns_server->tx_queue_head;
mdns_action_t * action = NULL;
// find first unqueued packet
while (p && p->queued) {
p = p->next;
}
if (!p) {
MDNS_SERVICE_UNLOCK();
return;
}
if ((int32_t)(p->send_at - (xTaskGetTickCount() * portTICK_PERIOD_MS)) < 0) {
action = (mdns_action_t *)malloc(sizeof(mdns_action_t));
if (action) {
action->type = ACTION_TX_HANDLE;
action->data.tx_handle.packet = p;
p->queued = true;
if (xQueueSend(_mdns_server->action_queue, &action, (TickType_t)0) != pdPASS) {
free(action);
p->queued = false;
}
} else {
HOOK_MALLOC_FAILED;
// continue
}
}
MDNS_SERVICE_UNLOCK();
}
/**
* @brief Called from timer task to run active searches
*/
static void _mdns_search_run(void)
{
MDNS_SERVICE_LOCK();
mdns_search_once_t * s = _mdns_server->search_once;
uint32_t now = xTaskGetTickCount() * portTICK_PERIOD_MS;
if (!s) {
MDNS_SERVICE_UNLOCK();
return;
}
while (s) {
if (s->state != SEARCH_OFF) {
if (now > (s->started_at + s->timeout)) {
s->state = SEARCH_OFF;
if (_mdns_send_search_action(ACTION_SEARCH_END, s) != ESP_OK) {
s->state = SEARCH_RUNNING;
}
} else if (s->state == SEARCH_INIT || (now - s->sent_at) > 1000) {
s->state = SEARCH_RUNNING;
s->sent_at = now;
if (_mdns_send_search_action(ACTION_SEARCH_SEND, s) != ESP_OK) {
s->sent_at -= 1000;
}
}
}
s = s->next;
}
MDNS_SERVICE_UNLOCK();
}
/**
* @brief the main MDNS service task. Packets are received and parsed here
*/
static void _mdns_service_task(void *pvParameters)
{
mdns_action_t * a = NULL;
for (;;) {
if (_mdns_server && _mdns_server->action_queue) {
if (xQueueReceive(_mdns_server->action_queue, &a, portMAX_DELAY) == pdTRUE) {
if (a->type == ACTION_TASK_STOP) {
break;
}
MDNS_SERVICE_LOCK();
_mdns_execute_action(a);
MDNS_SERVICE_UNLOCK();
}
} else {
vTaskDelay(500 * portTICK_PERIOD_MS);
}
}
_mdns_service_task_handle = NULL;
vTaskDelete(NULL);
}
static void _mdns_timer_cb(void * arg)
{
_mdns_scheduler_run();
_mdns_search_run();
}
static esp_err_t _mdns_start_timer(void){
esp_timer_create_args_t timer_conf = {
.callback = _mdns_timer_cb,
.arg = NULL,
.dispatch_method = ESP_TIMER_TASK,
.name = "mdns_timer"
};
esp_err_t err = esp_timer_create(&timer_conf, &(_mdns_server->timer_handle));
if (err) {
return err;
}
return esp_timer_start_periodic(_mdns_server->timer_handle, MDNS_TIMER_PERIOD_US);
}
static esp_err_t _mdns_stop_timer(void){
esp_err_t err = ESP_OK;
if (_mdns_server->timer_handle) {
err = esp_timer_stop(_mdns_server->timer_handle);
if (err) {
return err;
}
err = esp_timer_delete(_mdns_server->timer_handle);
}
return err;
}
/**
* @brief Start the service thread if not running
*
* @return
* - ESP_OK on success
* - ESP_FAIL on error
*/
static esp_err_t _mdns_service_task_start(void)
{
if (!_mdns_service_semaphore) {
_mdns_service_semaphore = xSemaphoreCreateMutex();
if (!_mdns_service_semaphore) {
return ESP_FAIL;
}
}
MDNS_SERVICE_LOCK();
if (_mdns_start_timer()) {
MDNS_SERVICE_UNLOCK();
return ESP_FAIL;
}
if (!_mdns_service_task_handle) {
xTaskCreatePinnedToCore(_mdns_service_task, "mdns", MDNS_SERVICE_STACK_DEPTH, NULL, MDNS_TASK_PRIORITY,
(TaskHandle_t * const)(&_mdns_service_task_handle), MDNS_TASK_AFFINITY);
if (!_mdns_service_task_handle) {
_mdns_stop_timer();
MDNS_SERVICE_UNLOCK();
vSemaphoreDelete(_mdns_service_semaphore);
_mdns_service_semaphore = NULL;
return ESP_FAIL;
}
}
MDNS_SERVICE_UNLOCK();
return ESP_OK;
}
/**
* @brief Stop the service thread
*
* @return
* - ESP_OK
*/
static esp_err_t _mdns_service_task_stop(void)
{
_mdns_stop_timer();
if (_mdns_service_task_handle) {
mdns_action_t action;
mdns_action_t * a = &action;
action.type = ACTION_TASK_STOP;
if (xQueueSend(_mdns_server->action_queue, &a, (TickType_t)0) != pdPASS) {
vTaskDelete(_mdns_service_task_handle);
_mdns_service_task_handle = NULL;
}
while (_mdns_service_task_handle) {
vTaskDelay(10 / portTICK_PERIOD_MS);
}
}
vSemaphoreDelete(_mdns_service_semaphore);
_mdns_service_semaphore = NULL;
return ESP_OK;
}
static esp_err_t mdns_post_custom_action_tcpip_if(mdns_if_t mdns_if, mdns_event_actions_t event_action)
{
if (!_mdns_server || mdns_if >= MDNS_MAX_INTERFACES) {
return ESP_ERR_INVALID_STATE;
}
mdns_action_t * action = (mdns_action_t *)calloc(1, sizeof(mdns_action_t));
if (!action) {
HOOK_MALLOC_FAILED;
return ESP_ERR_NO_MEM;
}
action->type = ACTION_SYSTEM_EVENT;
action->data.sys_event.event_action = event_action;
action->data.sys_event.interface = mdns_if;
if (xQueueSend(_mdns_server->action_queue, &action, (TickType_t)0) != pdPASS) {
free(action);
}
return ESP_OK;
}
static inline void set_default_duplicated_interfaces(void)
{
mdns_if_t wifi_sta_if = MDNS_MAX_INTERFACES;
mdns_if_t eth_if = MDNS_MAX_INTERFACES;
for (mdns_if_t i=0; i<MDNS_MAX_INTERFACES; i++) {
if (s_esp_netifs[i].predefined && s_esp_netifs[i].predef_if == MDNS_IF_STA) {
wifi_sta_if = i;
}
if (s_esp_netifs[i].predefined && s_esp_netifs[i].predef_if == MDNS_IF_ETH) {
eth_if = i;
}
}
if (wifi_sta_if != MDNS_MAX_INTERFACES && eth_if != MDNS_MAX_INTERFACES) {
s_esp_netifs[wifi_sta_if].duplicate = eth_if;
s_esp_netifs[eth_if].duplicate = wifi_sta_if;
}
}
static inline void unregister_predefined_handlers(void)
{
#if CONFIG_MDNS_PREDEF_NETIF_STA || CONFIG_MDNS_PREDEF_NETIF_AP
esp_event_handler_unregister(WIFI_EVENT, ESP_EVENT_ANY_ID, mdns_preset_if_handle_system_event);
#endif
#if CONFIG_MDNS_PREDEF_NETIF_STA || CONFIG_MDNS_PREDEF_NETIF_AP || CONFIG_MDNS_PREDEF_NETIF_ETH
esp_event_handler_unregister(IP_EVENT, ESP_EVENT_ANY_ID, mdns_preset_if_handle_system_event);
#endif
#if defined(CONFIG_ETH_ENABLED) && CONFIG_MDNS_PREDEF_NETIF_ETH
esp_event_handler_unregister(ETH_EVENT, ESP_EVENT_ANY_ID, mdns_preset_if_handle_system_event);
#endif
}
/*
* Public Methods
* */
esp_err_t mdns_netif_action(esp_netif_t *esp_netif, mdns_event_actions_t event_action)
{
return mdns_post_custom_action_tcpip_if(_mdns_get_if_from_esp_netif(esp_netif), event_action);
}
esp_err_t mdns_register_netif(esp_netif_t *esp_netif)
{
if (!_mdns_server) {
return ESP_ERR_INVALID_STATE;
}
esp_err_t err = ESP_ERR_NO_MEM;
MDNS_SERVICE_LOCK();
for (mdns_if_t i=0; i<MDNS_MAX_INTERFACES; ++i) {
if (s_esp_netifs[i].netif == esp_netif) {
MDNS_SERVICE_UNLOCK();
return ESP_ERR_INVALID_STATE;
}
}
for (mdns_if_t i=0; i<MDNS_MAX_INTERFACES; ++i) {
if (!s_esp_netifs[i].predefined && s_esp_netifs[i].netif == NULL) {
s_esp_netifs[i].netif = esp_netif;
err = ESP_OK;
break;
}
}
MDNS_SERVICE_UNLOCK();
return err;
}
esp_err_t mdns_unregister_netif(esp_netif_t *esp_netif)
{
if (!_mdns_server) {
return ESP_ERR_INVALID_STATE;
}
esp_err_t err = ESP_ERR_NOT_FOUND;
MDNS_SERVICE_LOCK();
for (mdns_if_t i=0; i<MDNS_MAX_INTERFACES; ++i) {
if (!s_esp_netifs[i].predefined && s_esp_netifs[i].netif == esp_netif) {
s_esp_netifs[i].netif = NULL;
err = ESP_OK;
break;
}
}
MDNS_SERVICE_UNLOCK();
return err;
}
esp_err_t mdns_init(void)
{
esp_err_t err = ESP_OK;
if (_mdns_server) {
return err;
}
_mdns_server = (mdns_server_t *)malloc(sizeof(mdns_server_t));
if (!_mdns_server) {
HOOK_MALLOC_FAILED;
return ESP_ERR_NO_MEM;
}
memset((uint8_t*)_mdns_server, 0, sizeof(mdns_server_t));
// zero-out local copy of netifs to initiate a fresh search by interface key whenever a netif ptr is needed
for (mdns_if_t i = 0; i < MDNS_MAX_INTERFACES; ++i) {
s_esp_netifs[i].netif = NULL;
}
_mdns_server->lock = xSemaphoreCreateMutex();
if (!_mdns_server->lock) {
err = ESP_ERR_NO_MEM;
goto free_server;
}
_mdns_server->action_queue = xQueueCreate(MDNS_ACTION_QUEUE_LEN, sizeof(mdns_action_t *));
if (!_mdns_server->action_queue) {
err = ESP_ERR_NO_MEM;
goto free_lock;
}
#if CONFIG_MDNS_PREDEF_NETIF_STA || CONFIG_MDNS_PREDEF_NETIF_AP
if ((err = esp_event_handler_register(WIFI_EVENT, ESP_EVENT_ANY_ID, mdns_preset_if_handle_system_event, NULL)) != ESP_OK) {
goto free_event_handlers;
}
#endif
#if CONFIG_MDNS_PREDEF_NETIF_STA || CONFIG_MDNS_PREDEF_NETIF_AP || CONFIG_MDNS_PREDEF_NETIF_ETH
if ((err = esp_event_handler_register(IP_EVENT, ESP_EVENT_ANY_ID, mdns_preset_if_handle_system_event, NULL)) != ESP_OK) {
goto free_event_handlers;
}
#endif
#if defined(CONFIG_ETH_ENABLED) && CONFIG_MDNS_PREDEF_NETIF_ETH
if ((err = esp_event_handler_register(ETH_EVENT, ESP_EVENT_ANY_ID, mdns_preset_if_handle_system_event, NULL)) != ESP_OK) {
goto free_event_handlers;
}
#endif
#if CONFIG_MDNS_PREDEF_NETIF_STA || CONFIG_MDNS_PREDEF_NETIF_AP || CONFIG_MDNS_PREDEF_NETIF_ETH
set_default_duplicated_interfaces();
#endif
uint8_t i;
#if CONFIG_LWIP_IPV6
esp_ip6_addr_t tmp_addr6;
#endif
esp_netif_ip_info_t if_ip_info;
for (i=0; i<MDNS_MAX_INTERFACES; i++) {
#if CONFIG_LWIP_IPV6
if (!esp_netif_get_ip6_linklocal(_mdns_get_esp_netif(i), &tmp_addr6) && !_ipv6_address_is_zero(tmp_addr6)) {
_mdns_enable_pcb(i, MDNS_IP_PROTOCOL_V6);
}
#endif
if (!esp_netif_get_ip_info(_mdns_get_esp_netif(i), &if_ip_info) && if_ip_info.ip.addr) {
_mdns_enable_pcb(i, MDNS_IP_PROTOCOL_V4);
}
}
if (_mdns_service_task_start()) {
//service start failed!
err = ESP_FAIL;
goto free_all_and_disable_pcbs;
}
return ESP_OK;
free_all_and_disable_pcbs:
for (i=0; i<MDNS_MAX_INTERFACES; i++) {
_mdns_disable_pcb(i, MDNS_IP_PROTOCOL_V6);
_mdns_disable_pcb(i, MDNS_IP_PROTOCOL_V4);
s_esp_netifs[i].duplicate = MDNS_MAX_INTERFACES;
}
#if CONFIG_MDNS_PREDEF_NETIF_STA || CONFIG_MDNS_PREDEF_NETIF_AP || CONFIG_MDNS_PREDEF_NETIF_ETH
free_event_handlers:
unregister_predefined_handlers();
#endif
vQueueDelete(_mdns_server->action_queue);
free_lock:
vSemaphoreDelete(_mdns_server->lock);
free_server:
free(_mdns_server);
_mdns_server = NULL;
return err;
}
void mdns_free(void)
{
uint8_t i, j;
if (!_mdns_server) {
return;
}
// Unregister handlers before destroying the mdns internals to avoid receiving async events while deinit
unregister_predefined_handlers();
mdns_service_remove_all();
free_delegated_hostnames();
_mdns_service_task_stop();
for (i=0; i<MDNS_MAX_INTERFACES; i++) {
for (j=0; j<MDNS_IP_PROTOCOL_MAX; j++) {
_mdns_pcb_deinit(i, j);
}
}
free((char*)_mdns_server->hostname);
free((char*)_mdns_server->instance);
if (_mdns_server->action_queue) {
mdns_action_t * c;
while (xQueueReceive(_mdns_server->action_queue, &c, 0) == pdTRUE) {
_mdns_free_action(c);
}
vQueueDelete(_mdns_server->action_queue);
}
_mdns_clear_tx_queue_head();
while (_mdns_server->search_once) {
mdns_search_once_t * h = _mdns_server->search_once;
_mdns_server->search_once = h->next;
free(h->instance);
free(h->service);
free(h->proto);
vSemaphoreDelete(h->done_semaphore);
if (h->result) {
mdns_query_results_free(h->result);
}
free(h);
}
vSemaphoreDelete(_mdns_server->lock);
free(_mdns_server);
_mdns_server = NULL;
}
esp_err_t mdns_hostname_set(const char * hostname)
{
if (!_mdns_server) {
return ESP_ERR_INVALID_ARG;
}
if (_str_null_or_empty(hostname) || strlen(hostname) > (MDNS_NAME_BUF_LEN - 1)) {
return ESP_ERR_INVALID_ARG;
}
char * new_hostname = strndup(hostname, MDNS_NAME_BUF_LEN - 1);
if (!new_hostname) {
return ESP_ERR_NO_MEM;
}
mdns_action_t * action = (mdns_action_t *)malloc(sizeof(mdns_action_t));
if (!action) {
HOOK_MALLOC_FAILED;
free(new_hostname);
return ESP_ERR_NO_MEM;
}
action->type = ACTION_HOSTNAME_SET;
action->data.hostname_set.hostname = new_hostname;
action->data.hostname_set.calling_task = xTaskGetCurrentTaskHandle();
if (xQueueSend(_mdns_server->action_queue, &action, (TickType_t)0) != pdPASS) {
free(new_hostname);
free(action);
return ESP_ERR_NO_MEM;
}
xTaskNotifyWait(0, 0x01, NULL, portMAX_DELAY);
return ESP_OK;
}
esp_err_t mdns_delegate_hostname_add(const char * hostname, const mdns_ip_addr_t * address_list)
{
if (!_mdns_server) {
return ESP_ERR_INVALID_STATE;
}
if (_str_null_or_empty(hostname) || strlen(hostname) > (MDNS_NAME_BUF_LEN - 1) || address_list == NULL) {
return ESP_ERR_INVALID_ARG;
}
char * new_hostname = strndup(hostname, MDNS_NAME_BUF_LEN - 1);
if (!new_hostname) {
return ESP_ERR_NO_MEM;
}
mdns_action_t * action = (mdns_action_t *)malloc(sizeof(mdns_action_t));
if (!action) {
HOOK_MALLOC_FAILED;
free(new_hostname);
return ESP_ERR_NO_MEM;
}
action->type = ACTION_DELEGATE_HOSTNAME_ADD;
action->data.delegate_hostname.hostname = new_hostname;
action->data.delegate_hostname.address_list = copy_address_list(address_list);
if (xQueueSend(_mdns_server->action_queue, &action, (TickType_t)0) != pdPASS) {
free(new_hostname);
free(action);
return ESP_ERR_NO_MEM;
}
return ESP_OK;
}
esp_err_t mdns_delegate_hostname_remove(const char * hostname)
{
if (!_mdns_server) {
return ESP_ERR_INVALID_STATE;
}
if (_str_null_or_empty(hostname) || strlen(hostname) > (MDNS_NAME_BUF_LEN - 1)) {
return ESP_ERR_INVALID_ARG;
}
char * new_hostname = strndup(hostname, MDNS_NAME_BUF_LEN - 1);
if (!new_hostname) {
return ESP_ERR_NO_MEM;
}
mdns_action_t * action = (mdns_action_t *)malloc(sizeof(mdns_action_t));
if (!action) {
HOOK_MALLOC_FAILED;
free(new_hostname);
return ESP_ERR_NO_MEM;
}
action->type = ACTION_DELEGATE_HOSTNAME_REMOVE;
action->data.delegate_hostname.hostname = new_hostname;
if (xQueueSend(_mdns_server->action_queue, &action, (TickType_t)0) != pdPASS) {
free(new_hostname);
free(action);
return ESP_ERR_NO_MEM;
}
return ESP_OK;
}
bool mdns_hostname_exists(const char * hostname)
{
return _hostname_is_ours(hostname);
}
esp_err_t mdns_instance_name_set(const char * instance)
{
if (!_mdns_server) {
return ESP_ERR_INVALID_STATE;
}
if (_str_null_or_empty(instance) || strlen(instance) > (MDNS_NAME_BUF_LEN - 1)) {
return ESP_ERR_INVALID_ARG;
}
char * new_instance = strndup(instance, MDNS_NAME_BUF_LEN - 1);
if (!new_instance) {
return ESP_ERR_NO_MEM;
}
mdns_action_t * action = (mdns_action_t *)malloc(sizeof(mdns_action_t));
if (!action) {
HOOK_MALLOC_FAILED;
free(new_instance);
return ESP_ERR_NO_MEM;
}
action->type = ACTION_INSTANCE_SET;
action->data.instance = new_instance;
if (xQueueSend(_mdns_server->action_queue, &action, (TickType_t)0) != pdPASS) {
free(new_instance);
free(action);
return ESP_ERR_NO_MEM;
}
return ESP_OK;
}
/*
* MDNS SERVICES
* */
esp_err_t mdns_service_add_for_host(const char * instance, const char * service, const char * proto, const char * hostname,
uint16_t port, mdns_txt_item_t txt[], size_t num_items)
{
if (!_mdns_server || _str_null_or_empty(service) || _str_null_or_empty(proto) || !port) {
return ESP_ERR_INVALID_ARG;
}
if (!_mdns_can_add_more_services()) {
return ESP_ERR_NO_MEM;
}
mdns_srv_item_t * item = _mdns_get_service_item_instance(instance, service, proto, hostname);
if (item) {
return ESP_ERR_INVALID_ARG;
}
mdns_service_t * s = _mdns_create_service(service, proto, hostname, port, instance, num_items, txt);
if (!s) {
return ESP_ERR_NO_MEM;
}
item = (mdns_srv_item_t *)malloc(sizeof(mdns_srv_item_t));
if (!item) {
HOOK_MALLOC_FAILED;
_mdns_free_service(s);
return ESP_ERR_NO_MEM;
}
item->service = s;
item->next = NULL;
mdns_action_t * action = (mdns_action_t *)malloc(sizeof(mdns_action_t));
if (!action) {
HOOK_MALLOC_FAILED;
_mdns_free_service(s);
free(item);
return ESP_ERR_NO_MEM;
}
action->type = ACTION_SERVICE_ADD;
action->data.srv_add.service = item;
if (xQueueSend(_mdns_server->action_queue, &action, (TickType_t)0) != pdPASS) {
_mdns_free_service(s);
free(item);
free(action);
return ESP_ERR_NO_MEM;
}
size_t start = xTaskGetTickCount();
size_t timeout_ticks = pdMS_TO_TICKS(MDNS_SERVICE_ADD_TIMEOUT_MS);
while (_mdns_get_service_item_instance(instance, service, proto, hostname) == NULL) {
uint32_t expired = xTaskGetTickCount() - start;
if (expired >= timeout_ticks) {
return ESP_FAIL; // Timeout
}
vTaskDelay(MIN(10 / portTICK_PERIOD_MS, timeout_ticks - expired));
}
return ESP_OK;
}
esp_err_t mdns_service_add(const char * instance, const char * service, const char * proto, uint16_t port,
mdns_txt_item_t txt[], size_t num_items)
{
if (!_mdns_server) {
return ESP_ERR_INVALID_STATE;
}
return mdns_service_add_for_host(instance, service, proto, _mdns_server->hostname, port, txt, num_items);
}
bool mdns_service_exists(const char * service_type, const char * proto, const char * hostname)
{
return _mdns_get_service_item(service_type, proto, hostname) != NULL;
}
bool mdns_service_exists_with_instance(const char *instance, const char *service_type, const char *proto,
const char *hostname)
{
return _mdns_get_service_item_instance(instance, service_type, proto, hostname) != NULL;
}
esp_err_t mdns_service_port_set_for_host(const char *instance, const char * service, const char * proto, const char * hostname, uint16_t port)
{
if (!_mdns_server || !_mdns_server->services || _str_null_or_empty(service) || _str_null_or_empty(proto) || !port) {
return ESP_ERR_INVALID_ARG;
}
mdns_srv_item_t * s = _mdns_get_service_item_instance(instance, service, proto, hostname);
if (!s) {
return ESP_ERR_NOT_FOUND;
}
mdns_action_t * action = (mdns_action_t *)malloc(sizeof(mdns_action_t));
if (!action) {
HOOK_MALLOC_FAILED;
return ESP_ERR_NO_MEM;
}
action->type = ACTION_SERVICE_PORT_SET;
action->data.srv_port.service = s;
action->data.srv_port.port = port;
if (xQueueSend(_mdns_server->action_queue, &action, (TickType_t)0) != pdPASS) {
free(action);
return ESP_ERR_NO_MEM;
}
return ESP_OK;
}
esp_err_t mdns_service_port_set(const char * service, const char * proto, uint16_t port)
{
if (!_mdns_server) {
return ESP_ERR_INVALID_STATE;
}
return mdns_service_port_set_for_host(NULL, service, proto, _mdns_server->hostname, port);
}
esp_err_t mdns_service_txt_set_for_host(const char * instance, const char * service, const char * proto, const char * hostname,
mdns_txt_item_t txt[], uint8_t num_items)
{
if (!_mdns_server || !_mdns_server->services || _str_null_or_empty(service) || _str_null_or_empty(proto) || (num_items && txt == NULL)) {
return ESP_ERR_INVALID_ARG;
}
mdns_srv_item_t * s = _mdns_get_service_item_instance(instance, service, proto, hostname);
if (!s) {
return ESP_ERR_NOT_FOUND;
}
mdns_txt_linked_item_t * new_txt = NULL;
if (num_items){
new_txt = _mdns_allocate_txt(num_items, txt);
if (!new_txt) {
return ESP_ERR_NO_MEM;
}
}
mdns_action_t * action = (mdns_action_t *)malloc(sizeof(mdns_action_t));
if (!action) {
HOOK_MALLOC_FAILED;
_mdns_free_linked_txt(new_txt);
return ESP_ERR_NO_MEM;
}
action->type = ACTION_SERVICE_TXT_REPLACE;
action->data.srv_txt_replace.service = s;
action->data.srv_txt_replace.txt = new_txt;
if (xQueueSend(_mdns_server->action_queue, &action, (TickType_t)0) != pdPASS) {
_mdns_free_linked_txt(new_txt);
free(action);
return ESP_ERR_NO_MEM;
}
return ESP_OK;
}
esp_err_t mdns_service_txt_set(const char * service, const char * proto, mdns_txt_item_t txt[], uint8_t num_items)
{
if (!_mdns_server) {
return ESP_ERR_INVALID_STATE;
}
return mdns_service_txt_set_for_host(NULL, service, proto, _mdns_server->hostname, txt, num_items);
}
esp_err_t mdns_service_txt_item_set_for_host_with_explicit_value_len(const char * instance, const char *service, const char *proto,
const char *hostname, const char *key,
const char *value, uint8_t value_len)
{
if (!_mdns_server || !_mdns_server->services || _str_null_or_empty(service) || _str_null_or_empty(proto) ||
_str_null_or_empty(key) || (!value && value_len)) {
return ESP_ERR_INVALID_ARG;
}
mdns_srv_item_t *s = _mdns_get_service_item_instance(instance, service, proto, hostname);
if (!s) {
return ESP_ERR_NOT_FOUND;
}
mdns_action_t *action = (mdns_action_t *)malloc(sizeof(mdns_action_t));
if (!action) {
HOOK_MALLOC_FAILED;
return ESP_ERR_NO_MEM;
}
action->type = ACTION_SERVICE_TXT_SET;
action->data.srv_txt_set.service = s;
action->data.srv_txt_set.key = strdup(key);
if (!action->data.srv_txt_set.key) {
free(action);
return ESP_ERR_NO_MEM;
}
if (value_len > 0) {
action->data.srv_txt_set.value = (char *)malloc(value_len);
if (!action->data.srv_txt_set.value) {
free(action->data.srv_txt_set.key);
free(action);
return ESP_ERR_NO_MEM;
}
memcpy(action->data.srv_txt_set.value, value, value_len);
action->data.srv_txt_set.value_len = value_len;
} else {
action->data.srv_txt_set.value = NULL;
action->data.srv_txt_set.value_len = 0;
}
if (xQueueSend(_mdns_server->action_queue, &action, (TickType_t)0) != pdPASS) {
free(action->data.srv_txt_set.key);
free(action->data.srv_txt_set.value);
free(action);
return ESP_ERR_NO_MEM;
}
return ESP_OK;
}
esp_err_t mdns_service_txt_item_set_for_host(const char * instance, const char *service, const char *proto, const char *hostname,
const char *key, const char *value)
{
return mdns_service_txt_item_set_for_host_with_explicit_value_len(instance, service, proto, hostname, key, value,
strlen(value));
}
esp_err_t mdns_service_txt_item_set(const char *service, const char *proto, const char *key, const char *value)
{
if (!_mdns_server) {
return ESP_ERR_INVALID_STATE;
}
return mdns_service_txt_item_set_for_host_with_explicit_value_len(NULL, service, proto, _mdns_server->hostname, key,
value, strlen(value));
}
esp_err_t mdns_service_txt_item_set_with_explicit_value_len(const char *service, const char *proto, const char *key,
const char *value, uint8_t value_len)
{
if (!_mdns_server) {
return ESP_ERR_INVALID_STATE;
}
return mdns_service_txt_item_set_for_host_with_explicit_value_len(NULL, service, proto, _mdns_server->hostname, key,
value, value_len);
}
esp_err_t mdns_service_txt_item_remove_for_host(const char * instance, const char * service, const char * proto, const char * hostname,
const char * key)
{
if (!_mdns_server || !_mdns_server->services || _str_null_or_empty(service) || _str_null_or_empty(proto) || _str_null_or_empty(key)) {
return ESP_ERR_INVALID_ARG;
}
mdns_srv_item_t * s = _mdns_get_service_item_instance(instance, service, proto, hostname);
if (!s) {
return ESP_ERR_NOT_FOUND;
}
mdns_action_t * action = (mdns_action_t *)malloc(sizeof(mdns_action_t));
if (!action) {
HOOK_MALLOC_FAILED;
return ESP_ERR_NO_MEM;
}
action->type = ACTION_SERVICE_TXT_DEL;
action->data.srv_txt_del.service = s;
action->data.srv_txt_del.key = strdup(key);
if (!action->data.srv_txt_del.key) {
free(action);
return ESP_ERR_NO_MEM;
}
if (xQueueSend(_mdns_server->action_queue, &action, (TickType_t)0) != pdPASS) {
free(action->data.srv_txt_del.key);
free(action);
return ESP_ERR_NO_MEM;
}
return ESP_OK;
}
esp_err_t mdns_service_txt_item_remove(const char * service, const char * proto, const char * key)
{
if (!_mdns_server) {
return ESP_ERR_INVALID_STATE;
}
return mdns_service_txt_item_remove_for_host(NULL, service, proto, _mdns_server->hostname, key);
}
esp_err_t mdns_service_subtype_add_for_host(const char *instance_name, const char *service, const char *proto,
const char *hostname, const char *subtype)
{
if (!_mdns_server || !_mdns_server->services || _str_null_or_empty(service) || _str_null_or_empty(proto) ||
_str_null_or_empty(subtype)) {
return ESP_ERR_INVALID_ARG;
}
mdns_srv_item_t * s = _mdns_get_service_item_instance(instance_name, service, proto, hostname);
if (!s) {
return ESP_ERR_NOT_FOUND;
}
mdns_action_t * action = (mdns_action_t *)malloc(sizeof(mdns_action_t));
if (!action) {
HOOK_MALLOC_FAILED;
return ESP_ERR_NO_MEM;
}
action->type = ACTION_SERVICE_SUBTYPE_ADD;
action->data.srv_subtype_add.service = s;
action->data.srv_subtype_add.subtype = strdup(subtype);
if (!action->data.srv_subtype_add.subtype) {
free(action);
return ESP_ERR_NO_MEM;
}
if (xQueueSend(_mdns_server->action_queue, &action, (TickType_t)0) != pdPASS) {
free(action->data.srv_subtype_add.subtype);
free(action);
return ESP_ERR_NO_MEM;
}
return ESP_OK;
}
esp_err_t mdns_service_instance_name_set_for_host(const char * instance_old, const char * service, const char * proto, const char * hostname,
const char * instance)
{
if (!_mdns_server || !_mdns_server->services || _str_null_or_empty(service) || _str_null_or_empty(proto)) {
return ESP_ERR_INVALID_ARG;
}
if (_str_null_or_empty(instance) || strlen(instance) > (MDNS_NAME_BUF_LEN - 1)) {
return ESP_ERR_INVALID_ARG;
}
mdns_srv_item_t * s = _mdns_get_service_item_instance(instance_old, service, proto, hostname);
if (!s) {
return ESP_ERR_NOT_FOUND;
}
char * new_instance = strndup(instance, MDNS_NAME_BUF_LEN - 1);
if (!new_instance) {
return ESP_ERR_NO_MEM;
}
mdns_action_t * action = (mdns_action_t *)malloc(sizeof(mdns_action_t));
if (!action) {
HOOK_MALLOC_FAILED;
free(new_instance);
return ESP_ERR_NO_MEM;
}
action->type = ACTION_SERVICE_INSTANCE_SET;
action->data.srv_instance.service = s;
action->data.srv_instance.instance = new_instance;
if (xQueueSend(_mdns_server->action_queue, &action, (TickType_t)0) != pdPASS) {
free(new_instance);
free(action);
return ESP_ERR_NO_MEM;
}
return ESP_OK;
}
esp_err_t mdns_service_instance_name_set(const char * service, const char * proto, const char * instance)
{
if (!_mdns_server) {
return ESP_ERR_INVALID_STATE;
}
return mdns_service_instance_name_set_for_host(NULL, service, proto, _mdns_server->hostname, instance);
}
esp_err_t mdns_service_remove_for_host(const char * instance, const char * service, const char * proto, const char * hostname)
{
if (!_mdns_server || !_mdns_server->services || _str_null_or_empty(service) || _str_null_or_empty(proto)) {
return ESP_ERR_INVALID_ARG;
}
mdns_srv_item_t * s = _mdns_get_service_item_instance(instance, service, proto, hostname);
if (!s) {
return ESP_ERR_NOT_FOUND;
}
mdns_action_t * action = (mdns_action_t *)malloc(sizeof(mdns_action_t));
if (!action) {
HOOK_MALLOC_FAILED;
return ESP_ERR_NO_MEM;
}
action->type = ACTION_SERVICE_DEL;
action->data.srv_del.service = s;
if (xQueueSend(_mdns_server->action_queue, &action, (TickType_t)0) != pdPASS) {
free(action);
return ESP_ERR_NO_MEM;
}
return ESP_OK;
}
esp_err_t mdns_service_remove(const char * service_type, const char * proto)
{
if (!_mdns_server) {
return ESP_ERR_INVALID_STATE;
}
return mdns_service_remove_for_host(NULL, service_type, proto, _mdns_server->hostname);
}
esp_err_t mdns_service_remove_all(void)
{
if (!_mdns_server) {
return ESP_ERR_INVALID_ARG;
}
if (!_mdns_server->services) {
return ESP_OK;
}
mdns_action_t * action = (mdns_action_t *)malloc(sizeof(mdns_action_t));
if (!action) {
HOOK_MALLOC_FAILED;
return ESP_ERR_NO_MEM;
}
action->type = ACTION_SERVICES_CLEAR;
if (xQueueSend(_mdns_server->action_queue, &action, (TickType_t)0) != pdPASS) {
free(action);
return ESP_ERR_NO_MEM;
}
return ESP_OK;
}
/*
* MDNS QUERY
* */
void mdns_query_results_free(mdns_result_t * results)
{
mdns_result_t * r;
mdns_ip_addr_t * a;
while (results) {
r = results;
free((char *)(r->hostname));
free((char *)(r->instance_name));
free((char *)(r->service_type));
free((char *)(r->proto));
for (size_t i=0; i<r->txt_count; i++) {
free((char *)(r->txt[i].key));
free((char *)(r->txt[i].value));
}
free(r->txt);
free(r->txt_value_len);
while (r->addr) {
a = r->addr;
r->addr = r->addr->next;
free(a);
}
results = results->next;
free(r);
}
}
esp_err_t mdns_query_async_delete(mdns_search_once_t* search)
{
if (!search) {
return ESP_ERR_INVALID_ARG;
}
if (search->state != SEARCH_OFF) {
return ESP_ERR_INVALID_STATE;
}
MDNS_SERVICE_LOCK();
_mdns_search_free(search);
MDNS_SERVICE_UNLOCK();
return ESP_OK;
}
bool mdns_query_async_get_results(mdns_search_once_t* search, uint32_t timeout, mdns_result_t ** results, uint8_t * num_results)
{
if (xSemaphoreTake(search->done_semaphore, pdMS_TO_TICKS(timeout)) == pdTRUE) {
if (results) {
*results = search->result;
}
if (num_results) {
*num_results = search->num_results;
}
return true;
}
return false;
}
mdns_search_once_t *mdns_query_async_new(const char *name, const char *service, const char *proto, uint16_t type,
uint32_t timeout, size_t max_results, mdns_query_notify_t notifier)
{
mdns_search_once_t *search = NULL;
if (!_mdns_server || !timeout || _str_null_or_empty(service) != _str_null_or_empty(proto)) {
return NULL;
}
search = _mdns_search_init(name, service, proto, type, type != MDNS_TYPE_PTR, timeout, max_results, notifier);
if (!search) {
return NULL;
}
if (_mdns_send_search_action(ACTION_SEARCH_ADD, search)) {
_mdns_search_free(search);
return NULL;
}
return search;
}
esp_err_t mdns_query_generic(const char * name, const char * service, const char * proto, uint16_t type, mdns_query_transmission_type_t transmission_type, uint32_t timeout, size_t max_results, mdns_result_t ** results)
{
mdns_search_once_t * search = NULL;
*results = NULL;
if (!_mdns_server) {
return ESP_ERR_INVALID_STATE;
}
if (!timeout || _str_null_or_empty(service) != _str_null_or_empty(proto)) {
return ESP_ERR_INVALID_ARG;
}
search = _mdns_search_init(name, service, proto, type, transmission_type == MDNS_QUERY_UNICAST, timeout, max_results, NULL);
if (!search) {
return ESP_ERR_NO_MEM;
}
if (_mdns_send_search_action(ACTION_SEARCH_ADD, search)) {
_mdns_search_free(search);
return ESP_ERR_NO_MEM;
}
xSemaphoreTake(search->done_semaphore, portMAX_DELAY);
*results = search->result;
_mdns_search_free(search);
return ESP_OK;
}
esp_err_t mdns_query(const char * name, const char * service_type, const char * proto, uint16_t type, uint32_t timeout, size_t max_results, mdns_result_t ** results)
{
return mdns_query_generic(name, service_type, proto, type, type != MDNS_TYPE_PTR, timeout, max_results, results);
}
esp_err_t mdns_query_ptr(const char * service, const char * proto, uint32_t timeout, size_t max_results, mdns_result_t ** results)
{
if (_str_null_or_empty(service) || _str_null_or_empty(proto)) {
return ESP_ERR_INVALID_ARG;
}
return mdns_query(NULL, service, proto, MDNS_TYPE_PTR, timeout, max_results, results);
}
esp_err_t mdns_query_srv(const char * instance, const char * service, const char * proto, uint32_t timeout, mdns_result_t ** result)
{
if (_str_null_or_empty(instance) || _str_null_or_empty(service) || _str_null_or_empty(proto)) {
return ESP_ERR_INVALID_ARG;
}
return mdns_query(instance, service, proto, MDNS_TYPE_SRV, timeout, 1, result);
}
esp_err_t mdns_query_txt(const char * instance, const char * service, const char * proto, uint32_t timeout, mdns_result_t ** result)
{
if (_str_null_or_empty(instance) || _str_null_or_empty(service) || _str_null_or_empty(proto)) {
return ESP_ERR_INVALID_ARG;
}
return mdns_query(instance, service, proto, MDNS_TYPE_TXT, timeout, 1, result);
}
esp_err_t mdns_query_a(const char * name, uint32_t timeout, esp_ip4_addr_t * addr)
{
mdns_result_t * result = NULL;
esp_err_t err;
if (_str_null_or_empty(name)) {
return ESP_ERR_INVALID_ARG;
}
if (strstr(name, ".local")) {
ESP_LOGW(TAG, "Please note that hostname must not contain domain name, as mDNS uses '.local' domain");
}
err = mdns_query(name, NULL, NULL, MDNS_TYPE_A, timeout, 1, &result);
if (err) {
return err;
}
if (!result) {
return ESP_ERR_NOT_FOUND;
}
mdns_ip_addr_t * a = result->addr;
while (a) {
if (a->addr.type == ESP_IPADDR_TYPE_V4) {
addr->addr = a->addr.u_addr.ip4.addr;
mdns_query_results_free(result);
return ESP_OK;
}
a = a->next;
}
mdns_query_results_free(result);
return ESP_ERR_NOT_FOUND;
}
#if CONFIG_LWIP_IPV6
esp_err_t mdns_query_aaaa(const char * name, uint32_t timeout, esp_ip6_addr_t * addr)
{
mdns_result_t * result = NULL;
esp_err_t err;
if (_str_null_or_empty(name)) {
return ESP_ERR_INVALID_ARG;
}
if (strstr(name, ".local")) {
ESP_LOGW(TAG, "Please note that hostname must not contain domain name, as mDNS uses '.local' domain");
}
err = mdns_query(name, NULL, NULL, MDNS_TYPE_AAAA, timeout, 1, &result);
if (err) {
return err;
}
if (!result) {
return ESP_ERR_NOT_FOUND;
}
mdns_ip_addr_t * a = result->addr;
while (a) {
if (a->addr.type == ESP_IPADDR_TYPE_V6) {
memcpy(addr->addr, a->addr.u_addr.ip6.addr, 16);
mdns_query_results_free(result);
return ESP_OK;
}
a = a->next;
}
mdns_query_results_free(result);
return ESP_ERR_NOT_FOUND;
}
#endif
#ifdef MDNS_ENABLE_DEBUG
void mdns_debug_packet(const uint8_t * data, size_t len)
{
static mdns_name_t n;
mdns_header_t header;
const uint8_t * content = data + MDNS_HEAD_LEN;
uint32_t t = xTaskGetTickCount() * portTICK_PERIOD_MS;
mdns_name_t * name = &n;
memset(name, 0, sizeof(mdns_name_t));
_mdns_dbg_printf("Packet[%u]: ", t);
header.id = _mdns_read_u16(data, MDNS_HEAD_ID_OFFSET);
header.flags.value = _mdns_read_u16(data, MDNS_HEAD_FLAGS_OFFSET);
header.questions = _mdns_read_u16(data, MDNS_HEAD_QUESTIONS_OFFSET);
header.answers = _mdns_read_u16(data, MDNS_HEAD_ANSWERS_OFFSET);
header.servers = _mdns_read_u16(data, MDNS_HEAD_SERVERS_OFFSET);
header.additional = _mdns_read_u16(data, MDNS_HEAD_ADDITIONAL_OFFSET);
_mdns_dbg_printf("%s",
(header.flags.value == MDNS_FLAGS_AUTHORITATIVE)?"AUTHORITATIVE\n":
(header.flags.value == MDNS_FLAGS_DISTRIBUTED)?"DISTRIBUTED\n":
(header.flags.value == 0)?"\n":" "
);
if (header.flags.value && header.flags.value != MDNS_FLAGS_AUTHORITATIVE) {
_mdns_dbg_printf("0x%04X\n", header.flags.value);
}
if (header.questions) {
uint8_t qs = header.questions;
while (qs--) {
content = _mdns_parse_fqdn(data, content, name, len);
if (!content || content + MDNS_CLASS_OFFSET + 1 >= data + len) {
header.answers = 0;
header.additional = 0;
header.servers = 0;
_mdns_dbg_printf("ERROR: parse header questions\n");
break;
}
uint16_t type = _mdns_read_u16(content, MDNS_TYPE_OFFSET);
uint16_t mdns_class = _mdns_read_u16(content, MDNS_CLASS_OFFSET);
bool unicast = !!(mdns_class & 0x8000);
mdns_class &= 0x7FFF;
content = content + 4;
_mdns_dbg_printf(" Q: ");
if (unicast) {
_mdns_dbg_printf("*U* ");
}
if (type == MDNS_TYPE_PTR) {
_mdns_dbg_printf("%s.%s%s.%s.%s. PTR ", name->host, name->sub?"_sub.":"", name->service, name->proto, name->domain);
} else if (type == MDNS_TYPE_SRV) {
_mdns_dbg_printf("%s.%s%s.%s.%s. SRV ", name->host, name->sub?"_sub.":"", name->service, name->proto, name->domain);
} else if (type == MDNS_TYPE_TXT) {
_mdns_dbg_printf("%s.%s%s.%s.%s. TXT ", name->host, name->sub?"_sub.":"", name->service, name->proto, name->domain);
} else if (type == MDNS_TYPE_A) {
_mdns_dbg_printf("%s.%s. A ", name->host, name->domain);
} else if (type == MDNS_TYPE_AAAA) {
_mdns_dbg_printf("%s.%s. AAAA ", name->host, name->domain);
} else if (type == MDNS_TYPE_NSEC) {
_mdns_dbg_printf("%s.%s%s.%s.%s. NSEC ", name->host, name->sub?"_sub.":"", name->service, name->proto, name->domain);
} else if (type == MDNS_TYPE_ANY) {
_mdns_dbg_printf("%s.%s%s.%s.%s. ANY ", name->host, name->sub?"_sub.":"", name->service, name->proto, name->domain);
} else {
_mdns_dbg_printf("%s.%s%s.%s.%s. %04X ", name->host, name->sub?"_sub.":"", name->service, name->proto, name->domain, type);
}
if (mdns_class == 0x0001) {
_mdns_dbg_printf("IN");
} else {
_mdns_dbg_printf("%04X", mdns_class);
}
_mdns_dbg_printf("\n");
}
}
if (header.answers || header.servers || header.additional) {
uint16_t recordIndex = 0;
while (content < (data + len)) {
content = _mdns_parse_fqdn(data, content, name, len);
if (!content) {
_mdns_dbg_printf("ERROR: parse mdns records\n");
break;
}
uint16_t type = _mdns_read_u16(content, MDNS_TYPE_OFFSET);
uint16_t mdns_class = _mdns_read_u16(content, MDNS_CLASS_OFFSET);
uint32_t ttl = _mdns_read_u32(content, MDNS_TTL_OFFSET);
uint16_t data_len = _mdns_read_u16(content, MDNS_LEN_OFFSET);
const uint8_t * data_ptr = content + MDNS_DATA_OFFSET;
bool flush = !!(mdns_class & 0x8000);
mdns_class &= 0x7FFF;
content = data_ptr + data_len;
if (content > (data + len)) {
_mdns_dbg_printf("ERROR: content length overflow\n");
break;
}
mdns_parsed_record_type_t record_type = MDNS_ANSWER;
if (recordIndex >= (header.answers + header.servers)) {
record_type = MDNS_EXTRA;
} else if (recordIndex >= (header.answers)) {
record_type = MDNS_NS;
}
recordIndex++;
if (record_type == MDNS_EXTRA) {
_mdns_dbg_printf(" X");
} else if (record_type == MDNS_NS) {
_mdns_dbg_printf(" S");
} else {
_mdns_dbg_printf(" A");
}
if (type == MDNS_TYPE_PTR) {
_mdns_dbg_printf(": %s%s%s.%s.%s. PTR ", name->host, name->host[0]?".":"", name->service, name->proto, name->domain);
} else if (type == MDNS_TYPE_SRV) {
_mdns_dbg_printf(": %s.%s.%s.%s. SRV ", name->host, name->service, name->proto, name->domain);
} else if (type == MDNS_TYPE_TXT) {
_mdns_dbg_printf(": %s.%s.%s.%s. TXT ", name->host, name->service, name->proto, name->domain);
} else if (type == MDNS_TYPE_A) {
_mdns_dbg_printf(": %s.%s. A ", name->host, name->domain);
} else if (type == MDNS_TYPE_AAAA) {
_mdns_dbg_printf(": %s.%s. AAAA ", name->host, name->domain);
} else if (type == MDNS_TYPE_NSEC) {
_mdns_dbg_printf(": %s.%s.%s.%s. NSEC ", name->host, name->service, name->proto, name->domain);
} else if (type == MDNS_TYPE_ANY) {
_mdns_dbg_printf(": %s.%s.%s.%s. ANY ", name->host, name->service, name->proto, name->domain);
} else if (type == MDNS_TYPE_OPT) {
_mdns_dbg_printf(": . OPT ");
} else {
_mdns_dbg_printf(": %s.%s.%s.%s. %04X ", name->host, name->service, name->proto, name->domain, type);
}
if (mdns_class == 0x0001) {
_mdns_dbg_printf("IN ");
} else {
_mdns_dbg_printf("%04X ", mdns_class);
}
if (flush) {
_mdns_dbg_printf("FLUSH ");
}
_mdns_dbg_printf("%u ", ttl);
_mdns_dbg_printf("[%u] ", data_len);
if (type == MDNS_TYPE_PTR) {
if (!_mdns_parse_fqdn(data, data_ptr, name, len)) {
_mdns_dbg_printf("ERROR: parse PTR\n");
continue;
}
_mdns_dbg_printf("%s.%s.%s.%s.\n", name->host, name->service, name->proto, name->domain);
} else if (type == MDNS_TYPE_SRV) {
if (!_mdns_parse_fqdn(data, data_ptr + MDNS_SRV_FQDN_OFFSET, name, len)) {
_mdns_dbg_printf("ERROR: parse SRV\n");
continue;
}
uint16_t priority = _mdns_read_u16(data_ptr, MDNS_SRV_PRIORITY_OFFSET);
uint16_t weight = _mdns_read_u16(data_ptr, MDNS_SRV_WEIGHT_OFFSET);
uint16_t port = _mdns_read_u16(data_ptr, MDNS_SRV_PORT_OFFSET);
_mdns_dbg_printf("%u %u %u %s.%s.\n", priority, weight, port, name->host, name->domain);
} else if (type == MDNS_TYPE_TXT) {
uint16_t i=0, y;
while (i < data_len) {
uint8_t partLen = data_ptr[i++];
if ((i+partLen) > data_len) {
_mdns_dbg_printf("ERROR: parse TXT\n");
break;
}
char txt[partLen+1];
for (y=0; y<partLen; y++) {
char d = data_ptr[i++];
txt[y] = d;
}
txt[partLen] = 0;
_mdns_dbg_printf("%s", txt);
if (i<data_len) {
_mdns_dbg_printf("; ");
}
}
_mdns_dbg_printf("\n");
} else if (type == MDNS_TYPE_AAAA) {
esp_ip6_addr_t ip6;
memcpy(&ip6, data_ptr, sizeof(esp_ip6_addr_t));
_mdns_dbg_printf(IPV6STR "\n", IPV62STR(ip6));
} else if (type == MDNS_TYPE_A) {
esp_ip4_addr_t ip;
memcpy(&ip, data_ptr, sizeof(esp_ip4_addr_t));
_mdns_dbg_printf(IPSTR "\n", IP2STR(&ip));
} else if (type == MDNS_TYPE_NSEC) {
const uint8_t * old_ptr = data_ptr;
const uint8_t * new_ptr = _mdns_parse_fqdn(data, data_ptr, name, len);
if (new_ptr) {
_mdns_dbg_printf("%s.%s.%s.%s. ", name->host, name->service, name->proto, name->domain);
size_t diff = new_ptr - old_ptr;
data_len -= diff;
data_ptr = new_ptr;
}
size_t i;
for (i=0; i<data_len; i++) {
_mdns_dbg_printf(" %02x", data_ptr[i]);
}
_mdns_dbg_printf("\n");
} else if (type == MDNS_TYPE_OPT) {
uint16_t opCode = _mdns_read_u16(data_ptr, 0);
uint16_t opLen = _mdns_read_u16(data_ptr, 2);
_mdns_dbg_printf(" Code: %04x Data[%u]:", opCode, opLen);
size_t i;
for (i=4; i<data_len; i++) {
_mdns_dbg_printf(" %02x", data_ptr[i]);
}
_mdns_dbg_printf("\n");
} else {
size_t i;
for (i=0; i<data_len; i++) {
_mdns_dbg_printf(" %02x", data_ptr[i]);
}
_mdns_dbg_printf("\n");
}
}
}
}
#endif
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