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esp-idf/components/lwip/apps/dhcpserver/dhcpserver.c

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/*
* SPDX-FileCopyrightText: 2015-2023 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "lwip/dhcp.h"
#include "lwip/err.h"
#include "lwip/pbuf.h"
#include "lwip/udp.h"
#include "lwip/mem.h"
#include "lwip/ip_addr.h"
#include "lwip/timeouts.h"
#include "dhcpserver/dhcpserver.h"
#include "dhcpserver/dhcpserver_options.h"
#if ESP_DHCPS
#ifdef LWIP_HOOK_FILENAME
#include LWIP_HOOK_FILENAME
#endif
#ifndef LWIP_HOOK_DHCPS_POST_APPEND_OPTS
#define LWIP_HOOK_DHCPS_POST_APPEND_OPTS(netif, dhcps, state, pp_opts)
#endif
#define BOOTP_BROADCAST 0x8000
#define DHCP_REQUEST 1
#define DHCP_REPLY 2
#define DHCP_HTYPE_ETHERNET 1
#define DHCP_HLEN_ETHERNET 6
#define DHCP_MSG_LEN 236
#define DHCPS_SERVER_PORT 67
#define DHCPS_CLIENT_PORT 68
#define DHCPDISCOVER 1
#define DHCPOFFER 2
#define DHCPREQUEST 3
#define DHCPDECLINE 4
#define DHCPACK 5
#define DHCPNAK 6
#define DHCPRELEASE 7
#define DHCP_OPTION_SUBNET_MASK 1
#define DHCP_OPTION_ROUTER 3
#define DHCP_OPTION_DNS_SERVER 6
#define DHCP_OPTION_REQ_IPADDR 50
#define DHCP_OPTION_LEASE_TIME 51
#define DHCP_OPTION_MSG_TYPE 53
#define DHCP_OPTION_SERVER_ID 54
#define DHCP_OPTION_INTERFACE_MTU 26
#define DHCP_OPTION_PERFORM_ROUTER_DISCOVERY 31
#define DHCP_OPTION_BROADCAST_ADDRESS 28
#define DHCP_OPTION_REQ_LIST 55
#define DHCP_OPTION_END 255
//#define USE_CLASS_B_NET 1
#define DHCPS_DEBUG 0
#define DHCPS_LOG printf
#define IS_INVALID_SUBNET_MASK(x) (((x-1) | x) != 0xFFFFFFFF)
/* Notes:
* CIDR eliminates the traditional Class A, Class B and Class C addresses.
*/
#define IP_CLASS_HOST_NUM(mask) (0xffffffff & ~mask)
#define DHCP_CHECK_SUBNET_MASK_IP(mask) \
do { \
if (IS_INVALID_SUBNET_MASK(mask)) { \
DHCPS_LOG("dhcps: Illegal subnet mask.\n"); \
return ERR_ARG; \
} \
} while (0)
#define DHCP_CHECK_IP_MATCH_SUBNET_MASK(mask, ip) \
u32_t start_ip = 0; \
u32_t end_ip = 0; \
do { \
start_ip = ip & mask; \
end_ip = start_ip | ~mask; \
if (ip == end_ip || ip == start_ip) { \
DHCPS_LOG("dhcps: ip address and subnet mask do not match.\n"); \
return ERR_ARG; \
} \
} while (0)
#define MAX_STATION_NUM CONFIG_LWIP_DHCPS_MAX_STATION_NUM
#define DHCPS_STATE_OFFER 1
#define DHCPS_STATE_DECLINE 2
#define DHCPS_STATE_ACK 3
#define DHCPS_STATE_NAK 4
#define DHCPS_STATE_IDLE 5
#define DHCPS_STATE_RELEASE 6
typedef enum {
DHCPS_HANDLE_CREATED = 0,
DHCPS_HANDLE_STARTED,
DHCPS_HANDLE_STOPPED,
DHCPS_HANDLE_DELETE_PENDING,
} dhcps_handle_state;
typedef struct list_node {
void *pnode;
struct list_node *pnext;
} list_node;
typedef struct {
ip4_addr_t ip;
ip4_addr_t netmask;
ip4_addr_t gw;
} ip_info_t;
////////////////////////////////////////////////////////////////////////////////////
static const u32_t magic_cookie = 0x63538263;
struct dhcps_t {
struct netif *dhcps_netif;
ip4_addr_t broadcast_dhcps;
ip4_addr_t server_address;
ip4_addr_t dns_server;
ip4_addr_t client_address;
ip4_addr_t client_address_plus;
ip4_addr_t dhcps_mask;
list_node *plist;
bool renew;
dhcps_lease_t dhcps_poll;
dhcps_time_t dhcps_lease_time;
dhcps_offer_t dhcps_offer;
dhcps_offer_t dhcps_dns;
dhcps_cb_t dhcps_cb;
void* dhcps_cb_arg;
struct udp_pcb *dhcps_pcb;
dhcps_handle_state state;
};
static void dhcps_tmr(void* arg);
dhcps_t *dhcps_new(void)
{
dhcps_t *dhcps = mem_calloc(1, sizeof(dhcps_t));
if (dhcps == NULL) {
return NULL;
}
dhcps->dhcps_netif = NULL;
dhcps->dns_server.addr = 0;
#ifdef USE_CLASS_B_NET
dhcps->dhcps_mask.addr = PP_HTONL(LWIP_MAKEU32(255, 240, 0, 0));
#else
dhcps->dhcps_mask.addr = PP_HTONL(LWIP_MAKEU32(255, 255, 255, 0));
#endif
dhcps->plist = NULL;
dhcps->renew = false;
dhcps->dhcps_lease_time = DHCPS_LEASE_TIME_DEF;
dhcps->dhcps_offer = 0xFF;
dhcps->dhcps_dns = 0x00;
dhcps->dhcps_pcb = NULL;
dhcps->state = DHCPS_HANDLE_CREATED;
return dhcps;
}
void dhcps_delete(dhcps_t *dhcps)
{
if (dhcps) {
if (dhcps->state == DHCPS_HANDLE_STARTED) {
// if the dhcp-server has started already, we have to postpone the deletion
dhcps->state = DHCPS_HANDLE_DELETE_PENDING;
} else {
// otherwise, we're free to delete the handle immediately
free(dhcps);
}
}
}
static void get_ip_info(struct netif * netif, ip_info_t *ip_info)
{
if (netif != NULL && netif_is_up(netif)) {
ip4_addr_set(&ip_info->ip, ip_2_ip4(&netif->ip_addr));
ip4_addr_set(&ip_info->netmask, ip_2_ip4(&netif->netmask));
ip4_addr_set(&ip_info->gw, ip_2_ip4(&netif->gw));
}
}
/******************************************************************************
* FunctionName : dhcps_option_info
* Description : get the DHCP message option info
* Parameters : op_id -- DHCP message option id
* opt_len -- DHCP message option length
* Returns : DHCP message option addr
*******************************************************************************/
void *dhcps_option_info(dhcps_t *dhcps, u8_t op_id, u32_t opt_len)
{
void *option_arg = NULL;
if (dhcps == NULL) {
return NULL;
}
switch (op_id) {
case IP_ADDRESS_LEASE_TIME:
if (opt_len == sizeof(dhcps_time_t)) {
option_arg = &dhcps->dhcps_lease_time;
}
break;
case REQUESTED_IP_ADDRESS:
if (opt_len == sizeof(dhcps_lease_t)) {
option_arg = &dhcps->dhcps_poll;
}
break;
case ROUTER_SOLICITATION_ADDRESS:
if (opt_len == sizeof(dhcps_offer_t)) {
option_arg = &dhcps->dhcps_offer;
}
break;
case DOMAIN_NAME_SERVER:
if (opt_len == sizeof(dhcps_offer_t)) {
option_arg = &dhcps->dhcps_dns;
}
break;
case SUBNET_MASK:
if (opt_len == sizeof(dhcps->dhcps_mask)) {
option_arg = &dhcps->dhcps_mask;
}
break;
default:
break;
}
return option_arg;
}
/******************************************************************************
* FunctionName : dhcps_set_option_info
* Description : set the DHCP message option info
* Parameters : op_id -- DHCP message option id
* opt_info -- DHCP message option info
* opt_len -- DHCP message option length
* Returns : none
*******************************************************************************/
err_t dhcps_set_option_info(dhcps_t *dhcps, u8_t op_id, void *opt_info, u32_t opt_len)
{
if (dhcps == NULL || opt_info == NULL) {
return ERR_ARG;
}
switch (op_id) {
case IP_ADDRESS_LEASE_TIME:
if (opt_len == sizeof(dhcps_time_t)) {
dhcps->dhcps_lease_time = *(dhcps_time_t *)opt_info;
}
break;
case REQUESTED_IP_ADDRESS:
if (opt_len == sizeof(dhcps_lease_t)) {
dhcps->dhcps_poll = *(dhcps_lease_t *)opt_info;
}
break;
case ROUTER_SOLICITATION_ADDRESS:
if (opt_len == sizeof(dhcps_offer_t)) {
dhcps->dhcps_offer = *(dhcps_offer_t *)opt_info;
}
break;
case DOMAIN_NAME_SERVER:
if (opt_len == sizeof(dhcps_offer_t)) {
dhcps->dhcps_dns = *(dhcps_offer_t *)opt_info;
}
break;
case SUBNET_MASK:
if (opt_len == sizeof(dhcps->dhcps_mask)) {
dhcps->dhcps_mask = *(ip4_addr_t *)opt_info;
}
default:
break;
}
return ERR_OK;
}
/******************************************************************************
* FunctionName : node_insert_to_list
* Description : insert the node to the list
* Parameters : phead -- the head node of the list
* pinsert -- the insert node of the list
* Returns : none
*******************************************************************************/
static void node_insert_to_list(list_node **phead, list_node *pinsert)
{
list_node *plist = NULL;
struct dhcps_pool *pdhcps_pool = NULL;
struct dhcps_pool *pdhcps_node = NULL;
if (*phead == NULL) {
*phead = pinsert;
} else {
plist = *phead;
pdhcps_node = pinsert->pnode;
pdhcps_pool = plist->pnode;
if (pdhcps_node->ip.addr < pdhcps_pool->ip.addr) {
pinsert->pnext = plist;
*phead = pinsert;
} else {
while (plist->pnext != NULL) {
pdhcps_pool = plist->pnext->pnode;
if (pdhcps_node->ip.addr < pdhcps_pool->ip.addr) {
pinsert->pnext = plist->pnext;
plist->pnext = pinsert;
break;
}
plist = plist->pnext;
}
if (plist->pnext == NULL) {
plist->pnext = pinsert;
}
}
}
// pinsert->pnext = NULL;
}
/******************************************************************************
* FunctionName : node_delete_from_list
* Description : remove the node from list
* Parameters : phead -- the head node of the list
* pdelete -- the remove node of the list
* Returns : none
*******************************************************************************/
void node_remove_from_list(list_node **phead, list_node *pdelete)
{
list_node *plist = NULL;
plist = *phead;
if (plist == NULL) {
*phead = NULL;
} else {
if (plist == pdelete) {
// Note: Ignoring the "use after free" warnings, as it could only happen
// if the linked list contains loops
*phead = plist->pnext; // NOLINT(clang-analyzer-unix.Malloc)
pdelete->pnext = NULL;
} else {
while (plist != NULL) {
if (plist->pnext == pdelete) { // NOLINT(clang-analyzer-unix.Malloc)
plist->pnext = pdelete->pnext;
pdelete->pnext = NULL;
}
plist = plist->pnext;
}
}
}
}
/******************************************************************************
* FunctionName : add_msg_type
* Description : add TYPE option of DHCP message
* Parameters : optptr -- the addr of DHCP message option
* Returns : the addr of DHCP message option
*******************************************************************************/
static u8_t *add_msg_type(u8_t *optptr, u8_t type)
{
*optptr++ = DHCP_OPTION_MSG_TYPE;
*optptr++ = 1;
*optptr++ = type;
return optptr;
}
/******************************************************************************
* FunctionName : add_offer_options
* Description : add OFFER option of DHCP message
* Parameters : optptr -- the addr of DHCP message option
* Returns : the addr of DHCP message option
*******************************************************************************/
static u8_t *add_offer_options(dhcps_t *dhcps, u8_t *optptr)
{
ip4_addr_t ipadd;
ipadd.addr = *((u32_t *) &dhcps->server_address);
*optptr++ = DHCP_OPTION_SUBNET_MASK;
*optptr++ = 4;
*optptr++ = ip4_addr1(&dhcps->dhcps_mask);
*optptr++ = ip4_addr2(&dhcps->dhcps_mask);
*optptr++ = ip4_addr3(&dhcps->dhcps_mask);
*optptr++ = ip4_addr4(&dhcps->dhcps_mask);
*optptr++ = DHCP_OPTION_LEASE_TIME;
*optptr++ = 4;
*optptr++ = ((dhcps->dhcps_lease_time * DHCPS_LEASE_UNIT) >> 24) & 0xFF;
*optptr++ = ((dhcps->dhcps_lease_time * DHCPS_LEASE_UNIT) >> 16) & 0xFF;
*optptr++ = ((dhcps->dhcps_lease_time * DHCPS_LEASE_UNIT) >> 8) & 0xFF;
*optptr++ = ((dhcps->dhcps_lease_time * DHCPS_LEASE_UNIT) >> 0) & 0xFF;
*optptr++ = DHCP_OPTION_SERVER_ID;
*optptr++ = 4;
*optptr++ = ip4_addr1(&ipadd);
*optptr++ = ip4_addr2(&ipadd);
*optptr++ = ip4_addr3(&ipadd);
*optptr++ = ip4_addr4(&ipadd);
if (dhcps_router_enabled(dhcps->dhcps_offer)) {
ip_info_t if_ip = { 0 };
get_ip_info(dhcps->dhcps_netif, &if_ip);
ip4_addr_t* gw_ip = (ip4_addr_t*)&if_ip.gw;
if (!ip4_addr_isany_val(*gw_ip)) {
*optptr++ = DHCP_OPTION_ROUTER;
*optptr++ = 4;
*optptr++ = ip4_addr1(gw_ip);
*optptr++ = ip4_addr2(gw_ip);
*optptr++ = ip4_addr3(gw_ip);
*optptr++ = ip4_addr4(gw_ip);
}
}
*optptr++ = DHCP_OPTION_DNS_SERVER;
*optptr++ = 4;
if (dhcps_dns_enabled(dhcps->dhcps_dns)) {
*optptr++ = ip4_addr1(&dhcps->dns_server);
*optptr++ = ip4_addr2(&dhcps->dns_server);
*optptr++ = ip4_addr3(&dhcps->dns_server);
*optptr++ = ip4_addr4(&dhcps->dns_server);
}else {
*optptr++ = ip4_addr1(&ipadd);
*optptr++ = ip4_addr2(&ipadd);
*optptr++ = ip4_addr3(&ipadd);
*optptr++ = ip4_addr4(&ipadd);
}
ip4_addr_t broadcast_addr = { .addr = (ipadd.addr & dhcps->dhcps_mask.addr) | ~dhcps->dhcps_mask.addr };
*optptr++ = DHCP_OPTION_BROADCAST_ADDRESS;
*optptr++ = 4;
*optptr++ = ip4_addr1(&broadcast_addr);
*optptr++ = ip4_addr2(&broadcast_addr);
*optptr++ = ip4_addr3(&broadcast_addr);
*optptr++ = ip4_addr4(&broadcast_addr);
*optptr++ = DHCP_OPTION_INTERFACE_MTU;
*optptr++ = 2;
*optptr++ = 0x05;
*optptr++ = 0xdc;
*optptr++ = DHCP_OPTION_PERFORM_ROUTER_DISCOVERY;
*optptr++ = 1;
*optptr++ = 0x00;
*optptr++ = 43;
*optptr++ = 6;
*optptr++ = 0x01;
*optptr++ = 4;
*optptr++ = 0x00;
*optptr++ = 0x00;
*optptr++ = 0x00;
*optptr++ = 0x02;
return optptr;
}
/******************************************************************************
* FunctionName : add_end
* Description : add end option of DHCP message
* Parameters : optptr -- the addr of DHCP message option
* Returns : the addr of DHCP message option
*******************************************************************************/
static u8_t *add_end(u8_t *optptr)
{
*optptr++ = DHCP_OPTION_END;
return optptr;
}
/******************************************************************************
* FunctionName : create_msg
* Description : create response message
* Parameters : m -- DHCP message info
* Returns : none
*******************************************************************************/
static void create_msg(dhcps_t *dhcps, struct dhcps_msg *m)
{
ip4_addr_t client;
client.addr = *((uint32_t *) &dhcps->client_address);
m->op = DHCP_REPLY;
m->htype = DHCP_HTYPE_ETHERNET;
m->hlen = 6;
m->hops = 0;
// os_memcpy((char *) xid, (char *) m->xid, sizeof(m->xid));
m->secs = 0;
m->flags = htons(BOOTP_BROADCAST);
memcpy((char *) m->yiaddr, (char *) &client.addr, sizeof(m->yiaddr));
memset((char *) m->ciaddr, 0, sizeof(m->ciaddr));
memset((char *) m->siaddr, 0, sizeof(m->siaddr));
memset((char *) m->giaddr, 0, sizeof(m->giaddr));
memset((char *) m->sname, 0, sizeof(m->sname));
memset((char *) m->file, 0, sizeof(m->file));
memset((char *) m->options, 0, sizeof(m->options));
u32_t magic_cookie_temp = magic_cookie;
memcpy((char *) m->options, &magic_cookie_temp, sizeof(magic_cookie_temp));
}
struct pbuf * dhcps_pbuf_alloc(u16_t len)
{
u16_t mlen = sizeof(struct dhcps_msg);
if (len > mlen) {
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: len=%d mlen=%d", len, mlen);
#endif
mlen = len;
}
return pbuf_alloc(PBUF_TRANSPORT, mlen, PBUF_RAM);
}
/******************************************************************************
* FunctionName : send_offer
* Description : DHCP message OFFER Response
* Parameters : m -- DHCP message info
* Returns : none
*******************************************************************************/
static void send_offer(dhcps_t *dhcps, struct dhcps_msg *m, u16_t len)
{
u8_t *end;
struct pbuf *p, *q;
u8_t *data;
u16_t cnt = 0;
u16_t i;
#if DHCPS_DEBUG
err_t SendOffer_err_t;
#endif
create_msg(dhcps, m);
end = add_msg_type(&m->options[4], DHCPOFFER);
end = add_offer_options(dhcps, end);
LWIP_HOOK_DHCPS_POST_APPEND_OPTS(dhcps->dhcps_netif, dhcps, DHCPOFFER, &end)
end = add_end(end);
p = dhcps_pbuf_alloc(len);
#if DHCPS_DEBUG
DHCPS_LOG("udhcp: send_offer>>p->ref = %d\n", p->ref);
#endif
if (p != NULL) {
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: send_offer>>pbuf_alloc succeed\n");
DHCPS_LOG("dhcps: send_offer>>p->tot_len = %d\n", p->tot_len);
DHCPS_LOG("dhcps: send_offer>>p->len = %d\n", p->len);
#endif
q = p;
while (q != NULL) {
data = (u8_t *)q->payload;
for (i = 0; i < q->len; i++) {
data[i] = ((u8_t *) m)[cnt++];
#if DHCPS_DEBUG
DHCPS_LOG("%02x ", data[i]);
if ((i + 1) % 16 == 0) {
DHCPS_LOG("\n");
}
#endif
}
q = q->next;
}
} else {
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: send_offer>>pbuf_alloc failed\n");
#endif
return;
}
ip_addr_t ip_temp = IPADDR4_INIT(0x0);
ip4_addr_set(ip_2_ip4(&ip_temp), &dhcps->broadcast_dhcps);
#if DHCPS_DEBUG
SendOffer_err_t = udp_sendto(pcb_dhcps, p, &ip_temp, DHCPS_CLIENT_PORT);
DHCPS_LOG("dhcps: send_offer>>udp_sendto result %x\n", SendOffer_err_t);
#else
udp_sendto(dhcps->dhcps_pcb, p, &ip_temp, DHCPS_CLIENT_PORT);
#endif
if (p->ref != 0) {
#if DHCPS_DEBUG
DHCPS_LOG("udhcp: send_offer>>free pbuf\n");
#endif
pbuf_free(p);
}
}
/******************************************************************************
* FunctionName : send_nak
* Description : DHCP message NACK Response
* Parameters : m -- DHCP message info
* Returns : none
*******************************************************************************/
static void send_nak(dhcps_t *dhcps, struct dhcps_msg *m, u16_t len)
{
u8_t *end;
struct pbuf *p, *q;
u8_t *data;
u16_t cnt = 0;
u16_t i;
#if DHCPS_DEBUG
err_t SendNak_err_t;
#endif
create_msg(dhcps, m);
end = add_msg_type(&m->options[4], DHCPNAK);
LWIP_HOOK_DHCPS_POST_APPEND_OPTS(dhcps->dhcps_netif, dhcps, DHCPNAK, &end)
end = add_end(end);
p = dhcps_pbuf_alloc(len);
#if DHCPS_DEBUG
DHCPS_LOG("udhcp: send_nak>>p->ref = %d\n", p->ref);
#endif
if (p != NULL) {
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: send_nak>>pbuf_alloc succeed\n");
DHCPS_LOG("dhcps: send_nak>>p->tot_len = %d\n", p->tot_len);
DHCPS_LOG("dhcps: send_nak>>p->len = %d\n", p->len);
#endif
q = p;
while (q != NULL) {
data = (u8_t *)q->payload;
for (i = 0; i < q->len; i++) {
data[i] = ((u8_t *) m)[cnt++];
#if DHCPS_DEBUG
DHCPS_LOG("%02x ", data[i]);
if ((i + 1) % 16 == 0) {
DHCPS_LOG("\n");
}
#endif
}
q = q->next;
}
} else {
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: send_nak>>pbuf_alloc failed\n");
#endif
return;
}
ip_addr_t ip_temp = IPADDR4_INIT(0x0);
ip4_addr_set(ip_2_ip4(&ip_temp), &dhcps->broadcast_dhcps);
#if DHCPS_DEBUG
SendNak_err_t = udp_sendto(pcb_dhcps, p, &ip_temp, DHCPS_CLIENT_PORT);
DHCPS_LOG("dhcps: send_nak>>udp_sendto result %x\n", SendNak_err_t);
#else
udp_sendto(dhcps->dhcps_pcb, p, &ip_temp, DHCPS_CLIENT_PORT);
#endif
if (p->ref != 0) {
#if DHCPS_DEBUG
DHCPS_LOG("udhcp: send_nak>>free pbuf\n");
#endif
pbuf_free(p);
}
}
/******************************************************************************
* FunctionName : send_ack
* Description : DHCP message ACK Response
* Parameters : m -- DHCP message info
* Returns : none
*******************************************************************************/
static void send_ack(dhcps_t *dhcps, struct dhcps_msg *m, u16_t len)
{
u8_t *end;
struct pbuf *p, *q;
u8_t *data;
u16_t cnt = 0;
u16_t i;
err_t SendAck_err_t;
create_msg(dhcps, m);
end = add_msg_type(&m->options[4], DHCPACK);
end = add_offer_options(dhcps, end);
LWIP_HOOK_DHCPS_POST_APPEND_OPTS(dhcps->dhcps_netif, dhcps, DHCPACK, &end)
end = add_end(end);
p = dhcps_pbuf_alloc(len);
#if DHCPS_DEBUG
DHCPS_LOG("udhcp: send_ack>>p->ref = %d\n", p->ref);
#endif
if (p != NULL) {
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: send_ack>>pbuf_alloc succeed\n");
DHCPS_LOG("dhcps: send_ack>>p->tot_len = %d\n", p->tot_len);
DHCPS_LOG("dhcps: send_ack>>p->len = %d\n", p->len);
#endif
q = p;
while (q != NULL) {
data = (u8_t *)q->payload;
for (i = 0; i < q->len; i++) {
data[i] = ((u8_t *) m)[cnt++];
#if DHCPS_DEBUG
DHCPS_LOG("%02x ", data[i]);
if ((i + 1) % 16 == 0) {
DHCPS_LOG("\n");
}
#endif
}
q = q->next;
}
} else {
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: send_ack>>pbuf_alloc failed\n");
#endif
return;
}
ip_addr_t ip_temp = IPADDR4_INIT(0x0);
ip4_addr_set(ip_2_ip4(&ip_temp), &dhcps->broadcast_dhcps);
SendAck_err_t = udp_sendto(dhcps->dhcps_pcb, p, &ip_temp, DHCPS_CLIENT_PORT);
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: send_ack>>udp_sendto result %x\n", SendAck_err_t);
#endif
if (SendAck_err_t == ERR_OK) {
dhcps->dhcps_cb(dhcps->dhcps_cb_arg, m->yiaddr, m->chaddr);
}
if (p->ref != 0) {
#if DHCPS_DEBUG
DHCPS_LOG("udhcp: send_ack>>free pbuf\n");
#endif
pbuf_free(p);
}
}
/******************************************************************************
* FunctionName : parse_options
* Description : parse DHCP message options
* Parameters : optptr -- DHCP message option info
* len -- DHCP message option length
* Returns : none
*******************************************************************************/
static u8_t parse_options(dhcps_t *dhcps, u8_t *optptr, s16_t len)
{
ip4_addr_t client;
bool is_dhcp_parse_end = false;
struct dhcps_state s;
client.addr = *((uint32_t *) &dhcps->client_address);
u8_t *end = optptr + len;
u16_t type = 0;
s.state = DHCPS_STATE_IDLE;
while (optptr < end) {
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: (s16_t)*optptr = %d\n", (s16_t)*optptr);
#endif
switch ((s16_t) *optptr) {
case DHCP_OPTION_MSG_TYPE: //53
type = *(optptr + 2);
break;
case DHCP_OPTION_REQ_IPADDR://50
if (memcmp((char *) &client.addr, (char *) optptr + 2, 4) == 0) {
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: DHCP_OPTION_REQ_IPADDR = 0 ok\n");
#endif
s.state = DHCPS_STATE_ACK;
} else {
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: DHCP_OPTION_REQ_IPADDR != 0 err\n");
#endif
s.state = DHCPS_STATE_NAK;
}
break;
case DHCP_OPTION_END: {
is_dhcp_parse_end = true;
}
break;
}
if (is_dhcp_parse_end) {
break;
}
optptr += optptr[1] + 2;
}
switch (type) {
case DHCPDISCOVER://1
s.state = DHCPS_STATE_OFFER;
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: DHCPD_STATE_OFFER\n");
#endif
break;
case DHCPREQUEST://3
if (!(s.state == DHCPS_STATE_ACK || s.state == DHCPS_STATE_NAK)) {
if (dhcps->renew == true) {
s.state = DHCPS_STATE_ACK;
} else {
s.state = DHCPS_STATE_NAK;
}
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: DHCPD_STATE_NAK\n");
#endif
}
break;
case DHCPDECLINE://4
s.state = DHCPS_STATE_IDLE;
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: DHCPD_STATE_IDLE\n");
#endif
break;
case DHCPRELEASE://7
s.state = DHCPS_STATE_RELEASE;
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: DHCPD_STATE_IDLE\n");
#endif
break;
}
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: return s.state = %d\n", s.state);
#endif
return s.state;
}
/******************************************************************************
* FunctionName : parse_msg
* Description : parse DHCP message from netif
* Parameters : m -- DHCP message info
* len -- DHCP message length
* Returns : DHCP message type
*******************************************************************************/
static s16_t parse_msg(dhcps_t *dhcps, struct dhcps_msg *m, u16_t len)
{
u32_t lease_timer = (dhcps->dhcps_lease_time * DHCPS_LEASE_UNIT)/DHCPS_COARSE_TIMER_SECS;
if (memcmp((char *)m->options, &magic_cookie, sizeof(magic_cookie)) == 0) {
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: len = %d\n", len);
#endif
ip4_addr_t addr_tmp;
struct dhcps_pool *pdhcps_pool = NULL;
list_node *pnode = NULL;
list_node *pback_node = NULL;
ip4_addr_t first_address;
bool flag = false;
first_address.addr = dhcps->dhcps_poll.start_ip.addr;
dhcps->client_address.addr = dhcps->client_address_plus.addr;
dhcps->renew = false;
if (dhcps->plist != NULL) {
for (pback_node = dhcps->plist; pback_node != NULL; pback_node = pback_node->pnext) {
pdhcps_pool = pback_node->pnode;
if (memcmp(pdhcps_pool->mac, m->chaddr, sizeof(pdhcps_pool->mac)) == 0) {
if (memcmp(&pdhcps_pool->ip.addr, m->ciaddr, sizeof(pdhcps_pool->ip.addr)) == 0) {
dhcps->renew = true;
}
dhcps->client_address.addr = pdhcps_pool->ip.addr;
pdhcps_pool->lease_timer = lease_timer;
pnode = pback_node;
goto POOL_CHECK;
} else if (pdhcps_pool->ip.addr == dhcps->client_address_plus.addr) {
addr_tmp.addr = htonl(dhcps->client_address_plus.addr);
addr_tmp.addr++;
dhcps->client_address_plus.addr = htonl(addr_tmp.addr);
dhcps->client_address.addr = dhcps->client_address_plus.addr;
}
if (flag == false) { // search the fisrt unused ip
if (first_address.addr < pdhcps_pool->ip.addr) {
flag = true;
} else {
addr_tmp.addr = htonl(first_address.addr);
addr_tmp.addr++;
first_address.addr = htonl(addr_tmp.addr);
}
}
}
} else {
dhcps->client_address.addr = dhcps->dhcps_poll.start_ip.addr;
}
if (dhcps->client_address_plus.addr > dhcps->dhcps_poll.end_ip.addr) {
dhcps->client_address.addr = first_address.addr;
}
if (dhcps->client_address.addr > dhcps->dhcps_poll.end_ip.addr) {
dhcps->client_address_plus.addr = dhcps->dhcps_poll.start_ip.addr;
pdhcps_pool = NULL;
pnode = NULL;
} else {
pdhcps_pool = (struct dhcps_pool *)mem_calloc(1, sizeof(struct dhcps_pool));
pdhcps_pool->ip.addr = dhcps->client_address.addr;
memcpy(pdhcps_pool->mac, m->chaddr, sizeof(pdhcps_pool->mac));
pdhcps_pool->lease_timer = lease_timer;
pnode = (list_node *)mem_calloc(1, sizeof(list_node));
pnode->pnode = pdhcps_pool;
pnode->pnext = NULL;
node_insert_to_list(&dhcps->plist, pnode);
if (dhcps->client_address.addr == dhcps->dhcps_poll.end_ip.addr) {
dhcps->client_address_plus.addr = dhcps->dhcps_poll.start_ip.addr;
} else {
addr_tmp.addr = htonl(dhcps->client_address.addr);
addr_tmp.addr++;
dhcps->client_address_plus.addr = htonl(addr_tmp.addr);
}
}
POOL_CHECK:
if ((dhcps->client_address.addr > dhcps->dhcps_poll.end_ip.addr) || (ip4_addr_isany(&dhcps->client_address))) {
if (pnode != NULL) {
node_remove_from_list(&dhcps->plist, pnode);
free(pnode);
pnode = NULL;
}
if (pdhcps_pool != NULL) {
free(pdhcps_pool);
pdhcps_pool = NULL;
}
return 4;
}
s16_t ret = parse_options(dhcps, &m->options[4], len);;
if (ret == DHCPS_STATE_RELEASE || ret == DHCPS_STATE_NAK) {
if (pnode != NULL) {
node_remove_from_list(&dhcps->plist, pnode);
free(pnode);
pnode = NULL;
}
if (pdhcps_pool != NULL) {
free(pdhcps_pool);
pdhcps_pool = NULL;
}
memset(&dhcps->client_address, 0x0, sizeof(dhcps->client_address));
}
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: xid changed\n");
DHCPS_LOG("dhcps: client_address.addr = %x\n", client_address.addr);
#endif
return ret;
}
return 0;
}
/******************************************************************************
* FunctionName : handle_dhcp
* Description : If an incoming DHCP message is in response to us, then trigger the state machine
* Parameters : arg -- arg user supplied argument (udp_pcb.recv_arg)
* pcb -- the udp_pcb which received data
* p -- the packet buffer that was received
* addr -- the remote IP address from which the packet was received
* port -- the remote port from which the packet was received
* Returns : none
*******************************************************************************/
static void handle_dhcp(void *arg,
struct udp_pcb *pcb,
struct pbuf *p,
const ip_addr_t *addr,
u16_t port)
{
struct dhcps_t *dhcps = arg;
struct dhcps_msg *pmsg_dhcps = NULL;
s16_t tlen, malloc_len;
u16_t i;
u16_t dhcps_msg_cnt = 0;
u8_t *p_dhcps_msg = NULL;
u8_t *data;
s16_t state;
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: handle_dhcp-> receive a packet\n");
#endif
if (p == NULL) {
return;
}
malloc_len = sizeof(struct dhcps_msg);
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: handle_dhcp malloc_len=%d rx_len=%d", malloc_len, p->tot_len);
#endif
if (malloc_len < p->tot_len) {
malloc_len = p->tot_len;
}
pmsg_dhcps = (struct dhcps_msg *)mem_calloc(1, malloc_len);
if (NULL == pmsg_dhcps) {
pbuf_free(p);
return;
}
p_dhcps_msg = (u8_t *)pmsg_dhcps;
tlen = p->tot_len;
data = p->payload;
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: handle_dhcp-> p->tot_len = %d\n", tlen);
DHCPS_LOG("dhcps: handle_dhcp-> p->len = %d\n", p->len);
#endif
for (i = 0; i < p->len; i++) {
p_dhcps_msg[dhcps_msg_cnt++] = data[i];
#if DHCPS_DEBUG
DHCPS_LOG("%02x ", data[i]);
if ((i + 1) % 16 == 0) {
DHCPS_LOG("\n");
}
#endif
}
if (p->next != NULL) {
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: handle_dhcp-> p->next != NULL\n");
DHCPS_LOG("dhcps: handle_dhcp-> p->next->tot_len = %d\n", p->next->tot_len);
DHCPS_LOG("dhcps: handle_dhcp-> p->next->len = %d\n", p->next->len);
#endif
data = p->next->payload;
for (i = 0; i < p->next->len; i++) {
p_dhcps_msg[dhcps_msg_cnt++] = data[i];
#if DHCPS_DEBUG
DHCPS_LOG("%02x ", data[i]);
if ((i + 1) % 16 == 0) {
DHCPS_LOG("\n");
}
#endif
}
}
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: handle_dhcp-> parse_msg(p)\n");
#endif
state = parse_msg(dhcps, pmsg_dhcps, tlen - 240);
#ifdef LWIP_HOOK_DHCPS_POST_STATE
state = LWIP_HOOK_DHCPS_POST_STATE(pmsg_dhcps, malloc_len, state);
#endif /* LWIP_HOOK_DHCPS_POST_STATE */
switch (state) {
case DHCPS_STATE_OFFER://1
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: handle_dhcp-> DHCPD_STATE_OFFER\n");
#endif
send_offer(dhcps, pmsg_dhcps, malloc_len);
break;
case DHCPS_STATE_ACK://3
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: handle_dhcp-> DHCPD_STATE_ACK\n");
#endif
send_ack(dhcps, pmsg_dhcps, malloc_len);
break;
case DHCPS_STATE_NAK://4
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: handle_dhcp-> DHCPD_STATE_NAK\n");
#endif
send_nak(dhcps, pmsg_dhcps, malloc_len);
break;
default :
break;
}
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: handle_dhcp-> pbuf_free(p)\n");
#endif
pbuf_free(p);
free(pmsg_dhcps);
pmsg_dhcps = NULL;
}
/******************************************************************************
* FunctionName : dhcps_poll_set
* Description : set ip poll from start to end for station
* Parameters : ip -- The current ip addr
* Returns : none
*******************************************************************************/
static void dhcps_poll_set(dhcps_t *dhcps, u32_t ip)
{
u32_t server_ip = 0;
u32_t start_ip = 0;
u32_t end_ip = 0;
u32_t range_start_ip = 0;
u32_t range_end_ip = 0;
dhcps_lease_t *dhcps_poll = &dhcps->dhcps_poll;
if (dhcps_poll->enable == true) {
server_ip = htonl(ip);
start_ip = htonl(dhcps_poll->start_ip.addr);
end_ip = htonl(dhcps_poll->end_ip.addr);
/*config ip information can't contain local ip*/
if ((start_ip <= server_ip) && (server_ip <= end_ip)) {
dhcps_poll->enable = false;
} else {
/*config ip information must be in the same segment as the local ip*/
if (!ip4_addr_netcmp(&dhcps_poll->start_ip, &dhcps->server_address, &dhcps->dhcps_mask)
|| !ip4_addr_netcmp(&dhcps_poll->end_ip, &dhcps->server_address, &dhcps->dhcps_mask)
|| (end_ip - start_ip + 1 > DHCPS_MAX_LEASE)) {
dhcps_poll->enable = false;
}
}
}
if (dhcps_poll->enable == false) {
server_ip = htonl(ip);
range_start_ip = server_ip & htonl(dhcps->dhcps_mask.addr);
range_end_ip = range_start_ip | ~htonl(dhcps->dhcps_mask.addr);
if (server_ip - range_start_ip > range_end_ip - server_ip) {
range_start_ip = range_start_ip + 1;
range_end_ip = server_ip - 1;
} else {
range_start_ip = server_ip + 1;
range_end_ip = range_end_ip - 1;
}
if (range_end_ip - range_start_ip + 1 > DHCPS_MAX_LEASE) {
range_end_ip = range_start_ip + DHCPS_MAX_LEASE - 1;
}
bzero(dhcps_poll, sizeof(*dhcps_poll));
dhcps_poll->start_ip.addr = range_start_ip;
dhcps_poll->end_ip.addr = range_end_ip;
dhcps_poll->start_ip.addr = htonl(dhcps_poll->start_ip.addr);
dhcps_poll->end_ip.addr = htonl(dhcps_poll->end_ip.addr);
}
}
/******************************************************************************
* FunctionName : dhcps_set_new_lease_cb
* Description : set callback for dhcp server when it assign an IP
* to the connected dhcp client
* Parameters : cb -- callback for dhcp server
* Returns : ERR_OK on success
*******************************************************************************/
err_t dhcps_set_new_lease_cb(dhcps_t *dhcps, dhcps_cb_t cb, void* cb_arg)
{
if (dhcps == NULL) {
return ERR_ARG;
}
dhcps->dhcps_cb = cb;
dhcps->dhcps_cb_arg = cb_arg;
return ERR_OK;
}
/******************************************************************************
* FunctionName : dhcps_start
* Description : start dhcp server function
* Parameters : netif -- The current netif addr
* : info -- The current ip info
* Returns : none
*******************************************************************************/
err_t dhcps_start(dhcps_t *dhcps, struct netif *netif, ip4_addr_t ip)
{
if (dhcps == NULL || netif == NULL) {
return ERR_ARG;
}
dhcps->dhcps_netif = netif;
if (dhcps->dhcps_pcb != NULL) {
udp_remove(dhcps->dhcps_pcb);
}
dhcps->dhcps_pcb = udp_new();
if (dhcps->dhcps_pcb == NULL || ip4_addr_isany_val(ip)) {
DHCPS_LOG("dhcps_start(): could not obtain pcb\n");
return ERR_ARG;
}
IP4_ADDR(&dhcps->broadcast_dhcps, 255, 255, 255, 255);
dhcps->server_address.addr = ip.addr;
DHCP_CHECK_SUBNET_MASK_IP(htonl(dhcps->dhcps_mask.addr));
DHCP_CHECK_IP_MATCH_SUBNET_MASK(htonl(dhcps->dhcps_mask.addr), htonl(ip.addr));
dhcps_poll_set(dhcps, dhcps->server_address.addr);
dhcps->client_address_plus.addr = dhcps->dhcps_poll.start_ip.addr;
udp_bind(dhcps->dhcps_pcb, &netif->ip_addr, DHCPS_SERVER_PORT);
udp_recv(dhcps->dhcps_pcb, handle_dhcp, dhcps);
#if DHCPS_DEBUG
DHCPS_LOG("dhcps:dhcps_start->udp_recv function Set a receive callback handle_dhcp for UDP_PCB pcb_dhcps\n");
#endif
dhcps->state = DHCPS_HANDLE_STARTED;
sys_timeout(DHCP_COARSE_TIMER_MSECS, dhcps_tmr, dhcps);
return ERR_OK;
}
/******************************************************************************
* FunctionName : dhcps_stop
* Description : stop dhcp server function
* Parameters : netif -- The current netif addr
* Returns : none
*******************************************************************************/
err_t dhcps_stop(dhcps_t *dhcps, struct netif *netif)
{
if (dhcps == NULL || netif == NULL || dhcps->dhcps_netif != netif) {
#if DHCPS_DEBUG
DHCPS_LOG("dhcps_stop: netif is NULL or invalid\n");
#endif
return ERR_ARG;
}
if (dhcps->dhcps_pcb != NULL) {
udp_disconnect(dhcps->dhcps_pcb);
udp_remove(dhcps->dhcps_pcb);
dhcps->dhcps_pcb = NULL;
}
list_node *pnode = NULL;
list_node *pback_node = NULL;
pnode = dhcps->plist;
while (pnode != NULL) {
pback_node = pnode;
pnode = pback_node->pnext;
node_remove_from_list(&dhcps->plist, pback_node);
free(pback_node->pnode);
pback_node->pnode = NULL;
free(pback_node);
pback_node = NULL;
}
sys_untimeout(dhcps_tmr, dhcps);
dhcps->state = DHCPS_HANDLE_STOPPED;
return ERR_OK;
}
/******************************************************************************
* FunctionName : kill_oldest_dhcps_pool
* Description : remove the oldest node from list
* Parameters : none
* Returns : none
*******************************************************************************/
static void kill_oldest_dhcps_pool(dhcps_t *dhcps)
{
list_node *pre = NULL, *p = NULL;
list_node *minpre = NULL, *minp = NULL;
struct dhcps_pool *pdhcps_pool = NULL, *pmin_pool = NULL;
pre = dhcps->plist;
assert(pre != NULL && pre->pnext != NULL); // Expect the list to have at least 2 nodes
p = pre->pnext;
minpre = pre;
minp = p;
while (p != NULL) {
pdhcps_pool = p->pnode;
pmin_pool = minp->pnode;
if (pdhcps_pool->lease_timer < pmin_pool->lease_timer) {
minp = p;
minpre = pre;
}
pre = p;
p = p->pnext;
}
minpre->pnext = minp->pnext;
free(minp->pnode);
minp->pnode = NULL;
free(minp);
minp = NULL;
}
/******************************************************************************
* FunctionName : dhcps_coarse_tmr
* Description : the lease time count
* Parameters : none
* Returns : none
*******************************************************************************/
static void dhcps_tmr(void *arg)
{
dhcps_t *dhcps = arg;
dhcps_handle_state state = dhcps->state;
if (state == DHCPS_HANDLE_DELETE_PENDING) {
free(dhcps);
return;
}
if (state != DHCPS_HANDLE_STARTED) {
return;
}
sys_timeout(DHCP_COARSE_TIMER_MSECS, dhcps_tmr, dhcps);
u8_t num_dhcps_pool = 0;
list_node *pback_node = NULL;
list_node *pnode = NULL;
struct dhcps_pool *pdhcps_pool = NULL;
pnode = dhcps->plist;
while (pnode != NULL) {
pdhcps_pool = pnode->pnode;
pdhcps_pool->lease_timer --;
if (pdhcps_pool->lease_timer == 0) {
pback_node = pnode;
pnode = pback_node->pnext;
node_remove_from_list(&dhcps->plist, pback_node);
free(pback_node->pnode);
pback_node->pnode = NULL;
free(pback_node);
pback_node = NULL;
} else {
pnode = pnode ->pnext;
num_dhcps_pool ++;
}
}
if (num_dhcps_pool > MAX_STATION_NUM) {
kill_oldest_dhcps_pool(dhcps);
}
}
/******************************************************************************
* FunctionName : dhcp_search_ip_on_mac
* Description : Search ip address based on mac address
* Parameters : mac -- The MAC addr
* ip -- The IP info
* Returns : true or false
*******************************************************************************/
bool dhcp_search_ip_on_mac(dhcps_t *dhcps, u8_t *mac, ip4_addr_t *ip)
{
struct dhcps_pool *pdhcps_pool = NULL;
list_node *pback_node = NULL;
bool ret = false;
if (dhcps == NULL) {
return false;
}
for (pback_node = dhcps->plist; pback_node != NULL; pback_node = pback_node->pnext) {
pdhcps_pool = pback_node->pnode;
if (memcmp(pdhcps_pool->mac, mac, sizeof(pdhcps_pool->mac)) == 0) {
memcpy(&ip->addr, &pdhcps_pool->ip.addr, sizeof(pdhcps_pool->ip.addr));
ret = true;
break;
}
}
return ret;
}
/******************************************************************************
* FunctionName : dhcps_dns_setserver
* Description : set DNS server address for dhcpserver
* Parameters : dnsserver -- The DNS server address
* Returns : ERR_ARG if invalid handle, ERR_OK on success
*******************************************************************************/
err_t dhcps_dns_setserver(dhcps_t *dhcps, const ip_addr_t *dnsserver)
{
if (dhcps == NULL) {
return ERR_ARG;
}
if (dnsserver != NULL) {
dhcps->dns_server = *(ip_2_ip4(dnsserver));
} else {
dhcps->dns_server = *(ip_2_ip4(IP_ADDR_ANY));
}
return ERR_OK;
}
/******************************************************************************
* FunctionName : dhcps_dns_getserver
* Description : get DNS server address for dhcpserver
* Parameters : none
* Returns : ip4_addr_t
*******************************************************************************/
err_t dhcps_dns_getserver(dhcps_t *dhcps, ip4_addr_t *dnsserver)
{
if (dhcps) {
*dnsserver = dhcps->dns_server;
return ERR_OK;
}
return ERR_ARG;
}
#endif // ESP_DHCPS
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