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27c28eb1e6
esp-idf/components/lwip/api/api_msg.c
XiaXiaotian 27c28eb1e6 Close socket request will abort tcp write/connect 
When tcp write/connect is running, close socket request will abort
    it and continue to delete netconn and close tcp. Do not immediately
    return after aborting tcp write/connect. Otherwise, tcp close
    requeset will block and tcp write/connect will crash.
2018-01-03 11:23:57 +08:00

1987 lines
61 KiB
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/**
* @file
* Sequential API Internal module
*
*/
/*
* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
* This file is part of the lwIP TCP/IP stack.
*
* Author: Adam Dunkels <adam@sics.se>
*
*/
#include "lwip/opt.h"
#if LWIP_NETCONN /* don't build if not configured for use in lwipopts.h */
#include "lwip/priv/api_msg.h"
#include "lwip/ip.h"
#include "lwip/udp.h"
#include "lwip/tcp.h"
#include "lwip/raw.h"
#include "lwip/memp.h"
#include "lwip/igmp.h"
#include "lwip/dns.h"
#include "lwip/mld6.h"
#include "lwip/priv/tcpip_priv.h"
#include <string.h>
/* netconns are polled once per second (e.g. continue write on memory error) */
#define NETCONN_TCP_POLL_INTERVAL 2
#define SET_NONBLOCKING_CONNECT(conn, val) do { if (val) { \
(conn)->flags |= NETCONN_FLAG_IN_NONBLOCKING_CONNECT; \
} else { \
(conn)->flags &= ~ NETCONN_FLAG_IN_NONBLOCKING_CONNECT; }} while(0)
#define IN_NONBLOCKING_CONNECT(conn) (((conn)->flags & NETCONN_FLAG_IN_NONBLOCKING_CONNECT) != 0)
/* forward declarations */
#if LWIP_TCP
#if LWIP_TCPIP_CORE_LOCKING
#define WRITE_DELAYED , 1
#define WRITE_DELAYED_PARAM , u8_t delayed
#else /* LWIP_TCPIP_CORE_LOCKING */
#define WRITE_DELAYED
#define WRITE_DELAYED_PARAM
#endif /* LWIP_TCPIP_CORE_LOCKING */
static err_t lwip_netconn_do_writemore(struct netconn *conn WRITE_DELAYED_PARAM);
#if ESP_LWIP
#define SIG_CLOSE_PARAM , bool sig_close
#define SIG_CLOSE_TRUE true
#define SIG_CLOSE_FALSE false
#else
#define SIG_CLOSE_PARAM
#define SIG_CLOSE_TRUE
#define SIG_CLOSE_FALSE
#endif
#endif
static err_t lwip_netconn_do_close_internal(struct netconn *conn WRITE_DELAYED_PARAM SIG_CLOSE_PARAM);
#if LWIP_RAW
/**
* Receive callback function for RAW netconns.
* Doesn't 'eat' the packet, only copies it and sends it to
* conn->recvmbox
*
* @see raw.h (struct raw_pcb.recv) for parameters and return value
*/
static u8_t
recv_raw(void *arg, struct raw_pcb *pcb, struct pbuf *p,
const ip_addr_t *addr)
{
struct pbuf *q;
struct netbuf *buf;
struct netconn *conn;
LWIP_UNUSED_ARG(addr);
conn = (struct netconn *)arg;
if ((conn != NULL) && sys_mbox_valid(&conn->recvmbox)) {
#if LWIP_SO_RCVBUF
int recv_avail;
SYS_ARCH_GET(conn->recv_avail, recv_avail);
if ((recv_avail + (int)(p->tot_len)) > conn->recv_bufsize) {
return 0;
}
#endif /* LWIP_SO_RCVBUF */
/* copy the whole packet into new pbufs */
q = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
if (q != NULL) {
if (pbuf_copy(q, p) != ERR_OK) {
pbuf_free(q);
q = NULL;
}
}
if (q != NULL) {
u16_t len;
buf = (struct netbuf *)memp_malloc(MEMP_NETBUF);
if (buf == NULL) {
pbuf_free(q);
return 0;
}
buf->p = q;
buf->ptr = q;
ip_addr_copy(buf->addr, *ip_current_src_addr());
buf->port = pcb->protocol;
len = q->tot_len;
if (sys_mbox_trypost(&conn->recvmbox, buf) != ERR_OK) {
ESP_STATS_DROP_INC(esp.rx_rawmbox_post_fail);
netbuf_delete(buf);
return 0;
} else {
#if LWIP_SO_RCVBUF
SYS_ARCH_INC(conn->recv_avail, len);
#endif /* LWIP_SO_RCVBUF */
/* Register event with callback */
API_EVENT(conn, NETCONN_EVT_RCVPLUS, len);
}
}
}
return 0; /* do not eat the packet */
}
#endif /* LWIP_RAW*/
#if LWIP_UDP
/**
* Receive callback function for UDP netconns.
* Posts the packet to conn->recvmbox or deletes it on memory error.
*
* @see udp.h (struct udp_pcb.recv) for parameters
*/
static void
recv_udp(void *arg, struct udp_pcb *pcb, struct pbuf *p,
const ip_addr_t *addr, u16_t port)
{
struct netbuf *buf;
struct netconn *conn;
u16_t len;
#if LWIP_SO_RCVBUF
int recv_avail;
#endif /* LWIP_SO_RCVBUF */
LWIP_UNUSED_ARG(pcb); /* only used for asserts... */
LWIP_ASSERT("recv_udp must have a pcb argument", pcb != NULL);
LWIP_ASSERT("recv_udp must have an argument", arg != NULL);
conn = (struct netconn *)arg;
LWIP_ASSERT("recv_udp: recv for wrong pcb!", conn->pcb.udp == pcb);
#if LWIP_SO_RCVBUF
SYS_ARCH_GET(conn->recv_avail, recv_avail);
if ((conn == NULL) || !sys_mbox_valid(&conn->recvmbox) ||
((recv_avail + (int)(p->tot_len)) > conn->recv_bufsize)) {
#else /* LWIP_SO_RCVBUF */
if ((conn == NULL) || !sys_mbox_valid(&conn->recvmbox)) {
#endif /* LWIP_SO_RCVBUF */
pbuf_free(p);
return;
}
#if LWIP_IPV6
/* This should be eventually moved to a flag on the UDP PCB, and this drop can happen
more correctly in udp_input(). This will also allow icmp_dest_unreach() to be called. */
if (conn->flags & NETCONN_FLAG_IPV6_V6ONLY && !ip_current_is_v6()) {
LWIP_DEBUGF(API_MSG_DEBUG, ("recv_udp: Dropping IPv4 UDP packet (IPv6-only socket)"));
pbuf_free(p);
return;
}
#endif
buf = (struct netbuf *)memp_malloc(MEMP_NETBUF);
if (buf == NULL) {
pbuf_free(p);
return;
} else {
buf->p = p;
buf->ptr = p;
ip_addr_set(&buf->addr, addr);
buf->port = port;
#if LWIP_NETBUF_RECVINFO
{
/* get the UDP header - always in the first pbuf, ensured by udp_input */
const struct udp_hdr* udphdr = (const struct udp_hdr*)ip_next_header_ptr();
#if LWIP_CHECKSUM_ON_COPY
buf->flags = NETBUF_FLAG_DESTADDR;
#endif /* LWIP_CHECKSUM_ON_COPY */
ip_addr_set(&buf->toaddr, ip_current_dest_addr());
buf->toport_chksum = udphdr->dest;
}
#endif /* LWIP_NETBUF_RECVINFO */
}
#if ESP_PERF
if (p->len > DBG_PERF_FILTER_LEN) {
DBG_PERF_PATH_SET(DBG_PERF_DIR_RX, DBG_PERF_POINT_LWIP_OUT);
}
#endif
len = p->tot_len;
if (sys_mbox_trypost(&conn->recvmbox, buf) != ERR_OK) {
ESP_STATS_DROP_INC(esp.rx_udpmbox_post_fail);
netbuf_delete(buf);
return;
} else {
#if LWIP_SO_RCVBUF
SYS_ARCH_INC(conn->recv_avail, len);
#endif /* LWIP_SO_RCVBUF */
/* Register event with callback */
API_EVENT(conn, NETCONN_EVT_RCVPLUS, len);
}
}
#endif /* LWIP_UDP */
#if LWIP_TCP
/**
* Receive callback function for TCP netconns.
* Posts the packet to conn->recvmbox, but doesn't delete it on errors.
*
* @see tcp.h (struct tcp_pcb.recv) for parameters and return value
*/
static err_t
recv_tcp(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err)
{
struct netconn *conn;
u16_t len;
LWIP_UNUSED_ARG(pcb);
LWIP_ASSERT("recv_tcp must have a pcb argument", pcb != NULL);
LWIP_ASSERT("recv_tcp must have an argument", arg != NULL);
conn = (struct netconn *)arg;
if (conn == NULL) {
return ERR_VAL;
}
LWIP_ASSERT("recv_tcp: recv for wrong pcb!", conn->pcb.tcp == pcb);
if (!sys_mbox_valid(&conn->recvmbox)) {
/* recvmbox already deleted */
if (p != NULL) {
tcp_recved(pcb, p->tot_len);
pbuf_free(p);
}
return ERR_OK;
}
/* Unlike for UDP or RAW pcbs, don't check for available space
using recv_avail since that could break the connection
(data is already ACKed) */
/* don't overwrite fatal errors! */
if (err != ERR_OK) {
NETCONN_SET_SAFE_ERR(conn, err);
}
if (p != NULL) {
len = p->tot_len;
} else {
len = 0;
}
if (sys_mbox_trypost(&conn->recvmbox, p) != ERR_OK) {
ESP_STATS_DROP_INC(esp.rx_tcpmbox_post_fail);
/* don't deallocate p: it is presented to us later again from tcp_fasttmr! */
return ERR_MEM;
} else {
#if LWIP_SO_RCVBUF
SYS_ARCH_INC(conn->recv_avail, len);
#endif /* LWIP_SO_RCVBUF */
/* Register event with callback */
API_EVENT(conn, NETCONN_EVT_RCVPLUS, len);
}
return ERR_OK;
}
/**
* Poll callback function for TCP netconns.
* Wakes up an application thread that waits for a connection to close
* or data to be sent. The application thread then takes the
* appropriate action to go on.
*
* Signals the conn->sem.
* netconn_close waits for conn->sem if closing failed.
*
* @see tcp.h (struct tcp_pcb.poll) for parameters and return value
*/
static err_t
poll_tcp(void *arg, struct tcp_pcb *pcb)
{
struct netconn *conn = (struct netconn *)arg;
bool sig_close = false;
LWIP_UNUSED_ARG(pcb);
LWIP_ASSERT("conn != NULL", (conn != NULL));
if (conn->state == NETCONN_WRITE) {
lwip_netconn_do_writemore(conn WRITE_DELAYED);
} else if (conn->state == NETCONN_CLOSE) {
#if !LWIP_SO_SNDTIMEO && !LWIP_SO_LINGER
if (conn->current_msg && conn->current_msg->msg.sd.polls_left) {
conn->current_msg->msg.sd.polls_left--;
}
#endif /* !LWIP_SO_SNDTIMEO && !LWIP_SO_LINGER */
/* Delay the netconn close until no one use 'conn' because close frees 'conn'*/
if (ERR_OK == lwip_netconn_do_close_internal(conn WRITE_DELAYED, SIG_CLOSE_FALSE)) {
sig_close = true;
}
}
/* @todo: implement connect timeout here? */
/* Did a nonblocking write fail before? Then check available write-space. */
if (conn->flags & NETCONN_FLAG_CHECK_WRITESPACE) {
/* If the queued byte- or pbuf-count drops below the configured low-water limit,
let select mark this pcb as writable again. */
if ((conn->pcb.tcp != NULL) && (tcp_sndbuf(conn->pcb.tcp) > TCP_SNDLOWAT(conn->pcb.tcp)) &&
(tcp_sndqueuelen(conn->pcb.tcp) < TCP_SNDQUEUELOWAT(conn->pcb.tcp))) {
conn->flags &= ~NETCONN_FLAG_CHECK_WRITESPACE;
API_EVENT(conn, NETCONN_EVT_SENDPLUS, 0);
}
}
#if ESP_LWIP
if (sig_close) {
sys_sem_t *op_completed_sem = LWIP_API_MSG_SEM(conn->current_msg);
conn->current_msg = NULL;
sys_sem_signal(op_completed_sem);
return ERR_ABRT;
}
#endif
return ERR_OK;
}
/**
* Sent callback function for TCP netconns.
* Signals the conn->sem and calls API_EVENT.
* netconn_write waits for conn->sem if send buffer is low.
*
* @see tcp.h (struct tcp_pcb.sent) for parameters and return value
*/
static err_t
sent_tcp(void *arg, struct tcp_pcb *pcb, u16_t len)
{
struct netconn *conn = (struct netconn *)arg;
bool sig_close = false;
LWIP_UNUSED_ARG(pcb);
LWIP_ASSERT("conn != NULL", (conn != NULL));
if (conn) {
if (conn->state == NETCONN_WRITE) {
lwip_netconn_do_writemore(conn WRITE_DELAYED);
} else if (conn->state == NETCONN_CLOSE) {
/* Delay the netconn close until no one use 'conn' because close frees 'conn'*/
if (ERR_OK == lwip_netconn_do_close_internal(conn WRITE_DELAYED, SIG_CLOSE_FALSE)) {
sig_close = true;
}
}
/* If the queued byte- or pbuf-count drops below the configured low-water limit,
let select mark this pcb as writable again. */
if ((conn->pcb.tcp != NULL) && (tcp_sndbuf(conn->pcb.tcp) > TCP_SNDLOWAT(conn->pcb.tcp) &&
(tcp_sndqueuelen(conn->pcb.tcp) < TCP_SNDQUEUELOWAT(conn->pcb.tcp)))) {
conn->flags &= ~NETCONN_FLAG_CHECK_WRITESPACE;
API_EVENT(conn, NETCONN_EVT_SENDPLUS, len);
}
#if ESP_LWIP
if (sig_close) {
sys_sem_t *op_completed_sem = LWIP_API_MSG_SEM(conn->current_msg);
conn->current_msg = NULL;
sys_sem_signal(op_completed_sem);
return ERR_ABRT;
}
#endif
}
return ERR_OK;
}
/**
* Error callback function for TCP netconns.
* Signals conn->sem, posts to all conn mboxes and calls API_EVENT.
* The application thread has then to decide what to do.
*
* @see tcp.h (struct tcp_pcb.err) for parameters
*/
static void
err_tcp(void *arg, err_t err)
{
struct netconn *conn;
enum netconn_state old_state;
conn = (struct netconn *)arg;
LWIP_ASSERT("conn != NULL", (conn != NULL));
conn->pcb.tcp = NULL;
/* no check since this is always fatal! */
SYS_ARCH_SET(conn->last_err, err);
/* reset conn->state now before waking up other threads */
old_state = conn->state;
conn->state = NETCONN_NONE;
/* @todo: the type of NETCONN_EVT created should depend on 'old_state' */
/* Notify the user layer about a connection error. Used to signal select. */
API_EVENT(conn, NETCONN_EVT_ERROR, 0);
/* Try to release selects pending on 'read' or 'write', too.
They will get an error if they actually try to read or write. */
API_EVENT(conn, NETCONN_EVT_RCVPLUS, 0);
API_EVENT(conn, NETCONN_EVT_SENDPLUS, 0);
/* pass NULL-message to recvmbox to wake up pending recv */
if (sys_mbox_valid(&conn->recvmbox)) {
/* use trypost to prevent deadlock */
if (sys_mbox_trypost(&conn->recvmbox, NULL) != ERR_OK){
ESP_STATS_DROP_INC(esp.err_tcp_rxmbox_post_fail);
}
}
/* pass NULL-message to acceptmbox to wake up pending accept */
if (sys_mbox_valid(&conn->acceptmbox)) {
/* use trypost to preven deadlock */
if (sys_mbox_trypost(&conn->acceptmbox, NULL) != ERR_OK) {
ESP_STATS_DROP_INC(esp.err_tcp_rxmbox_post_fail);
}
}
if ((old_state == NETCONN_WRITE) || (old_state == NETCONN_CLOSE) ||
(old_state == NETCONN_CONNECT)) {
/* calling lwip_netconn_do_writemore/lwip_netconn_do_close_internal is not necessary
since the pcb has already been deleted! */
int was_nonblocking_connect = IN_NONBLOCKING_CONNECT(conn);
SET_NONBLOCKING_CONNECT(conn, 0);
if (!was_nonblocking_connect) {
sys_sem_t* op_completed_sem;
/* set error return code */
LWIP_ASSERT("conn->current_msg != NULL", conn->current_msg != NULL);
conn->current_msg->err = err;
op_completed_sem = LWIP_API_MSG_SEM(conn->current_msg);
LWIP_ASSERT("inavlid op_completed_sem", sys_sem_valid(op_completed_sem));
conn->current_msg = NULL;
/* wake up the waiting task */
NETCONN_SET_SAFE_ERR(conn, err);
sys_sem_signal(op_completed_sem);
}
} else {
LWIP_ASSERT("conn->current_msg == NULL", conn->current_msg == NULL);
}
}
/**
* Setup a tcp_pcb with the correct callback function pointers
* and their arguments.
*
* @param conn the TCP netconn to setup
*/
static void
setup_tcp(struct netconn *conn)
{
struct tcp_pcb *pcb;
pcb = conn->pcb.tcp;
tcp_arg(pcb, conn);
tcp_recv(pcb, recv_tcp);
tcp_sent(pcb, sent_tcp);
tcp_poll(pcb, poll_tcp, NETCONN_TCP_POLL_INTERVAL);
tcp_err(pcb, err_tcp);
}
/**
* Accept callback function for TCP netconns.
* Allocates a new netconn and posts that to conn->acceptmbox.
*
* @see tcp.h (struct tcp_pcb_listen.accept) for parameters and return value
*/
static err_t
accept_function(void *arg, struct tcp_pcb *newpcb, err_t err)
{
struct netconn *newconn;
struct netconn *conn = (struct netconn *)arg;
LWIP_DEBUGF(API_MSG_DEBUG, ("accept_function: newpcb->tate: %s\n", tcp_debug_state_str(newpcb->state)));
if (!sys_mbox_valid(&conn->acceptmbox)) {
LWIP_DEBUGF(API_MSG_DEBUG, ("accept_function: acceptmbox already deleted\n"));
return ERR_VAL;
}
/* We have to set the callback here even though
* the new socket is unknown. conn->socket is marked as -1. */
newconn = netconn_alloc(conn->type, conn->callback);
if (newconn == NULL) {
return ERR_MEM;
}
newconn->pcb.tcp = newpcb;
setup_tcp(newconn);
/* no protection: when creating the pcb, the netconn is not yet known
to the application thread */
newconn->last_err = err;
if (sys_mbox_trypost(&conn->acceptmbox, newconn) != ERR_OK) {
ESP_STATS_DROP_INC(esp.acceptmbox_post_fail);
/* When returning != ERR_OK, the pcb is aborted in tcp_process(),
so do nothing here! */
/* remove all references to this netconn from the pcb */
struct tcp_pcb* pcb = newconn->pcb.tcp;
tcp_arg(pcb, NULL);
tcp_recv(pcb, NULL);
tcp_sent(pcb, NULL);
tcp_poll(pcb, NULL, 0);
tcp_err(pcb, NULL);
/* remove reference from to the pcb from this netconn */
newconn->pcb.tcp = NULL;
/* no need to drain since we know the recvmbox is empty. */
sys_mbox_free(&newconn->recvmbox);
sys_mbox_set_invalid(&newconn->recvmbox);
netconn_free(newconn);
return ERR_MEM;
} else {
/* Register event with callback */
API_EVENT(conn, NETCONN_EVT_RCVPLUS, 0);
}
return ERR_OK;
}
#endif /* LWIP_TCP */
/**
* Create a new pcb of a specific type.
* Called from lwip_netconn_do_newconn().
*
* @param msg the api_msg_msg describing the connection type
* @return msg->conn->err, but the return value is currently ignored
*/
static void
pcb_new(struct api_msg_msg *msg)
{
LWIP_ASSERT("pcb_new: pcb already allocated", msg->conn->pcb.tcp == NULL);
/* Allocate a PCB for this connection */
switch(NETCONNTYPE_GROUP(msg->conn->type)) {
#if LWIP_RAW
case NETCONN_RAW:
msg->conn->pcb.raw = raw_new(msg->msg.n.proto);
if (msg->conn->pcb.raw != NULL) {
raw_recv(msg->conn->pcb.raw, recv_raw, msg->conn);
}
break;
#endif /* LWIP_RAW */
#if LWIP_UDP
case NETCONN_UDP:
msg->conn->pcb.udp = udp_new();
if (msg->conn->pcb.udp != NULL) {
#if LWIP_UDPLITE
if (NETCONNTYPE_ISUDPLITE(msg->conn->type)) {
udp_setflags(msg->conn->pcb.udp, UDP_FLAGS_UDPLITE);
}
#endif /* LWIP_UDPLITE */
if (NETCONNTYPE_ISUDPNOCHKSUM(msg->conn->type)) {
udp_setflags(msg->conn->pcb.udp, UDP_FLAGS_NOCHKSUM);
}
udp_recv(msg->conn->pcb.udp, recv_udp, msg->conn);
}
break;
#endif /* LWIP_UDP */
#if LWIP_TCP
case NETCONN_TCP:
msg->conn->pcb.tcp = tcp_new();
if (msg->conn->pcb.tcp != NULL) {
setup_tcp(msg->conn);
}
break;
#endif /* LWIP_TCP */
default:
/* Unsupported netconn type, e.g. protocol disabled */
msg->err = ERR_VAL;
return;
}
if (msg->conn->pcb.ip == NULL) {
msg->err = ERR_MEM;
}
#if LWIP_IPV4 && LWIP_IPV6
else {
if (NETCONNTYPE_ISIPV6(msg->conn->type)) {
/* Convert IPv4 PCB manually to an IPv6 PCB */
IP_SET_TYPE_VAL(msg->conn->pcb.ip->local_ip, IPADDR_TYPE_V6);
IP_SET_TYPE_VAL(msg->conn->pcb.ip->remote_ip, IPADDR_TYPE_V6);
}
}
#endif /* LWIP_IPV4 && LWIP_IPV6 */
}
/**
* Create a new pcb of a specific type inside a netconn.
* Called from netconn_new_with_proto_and_callback.
*
* @param msg the api_msg_msg describing the connection type
*/
void
lwip_netconn_do_newconn(void *m)
{
struct api_msg_msg *msg = (struct api_msg_msg*)m;
msg->err = ERR_OK;
if (msg->conn->pcb.tcp == NULL) {
pcb_new(msg);
}
/* Else? This "new" connection already has a PCB allocated. */
/* Is this an error condition? Should it be deleted? */
/* We currently just are happy and return. */
TCPIP_APIMSG_ACK(msg);
}
/**
* Create a new netconn (of a specific type) that has a callback function.
* The corresponding pcb is NOT created!
*
* @param t the type of 'connection' to create (@see enum netconn_type)
* @param proto the IP protocol for RAW IP pcbs
* @param callback a function to call on status changes (RX available, TX'ed)
* @return a newly allocated struct netconn or
* NULL on memory error
*/
struct netconn*
netconn_alloc(enum netconn_type t, netconn_callback callback)
{
struct netconn *conn;
int size;
conn = (struct netconn *)memp_malloc(MEMP_NETCONN);
if (conn == NULL) {
return NULL;
}
conn->last_err = ERR_OK;
conn->type = t;
conn->pcb.tcp = NULL;
/* If all sizes are the same, every compiler should optimize this switch to nothing */
switch(NETCONNTYPE_GROUP(t)) {
#if LWIP_RAW
case NETCONN_RAW:
size = DEFAULT_RAW_RECVMBOX_SIZE;
break;
#endif /* LWIP_RAW */
#if LWIP_UDP
case NETCONN_UDP:
size = DEFAULT_UDP_RECVMBOX_SIZE;
break;
#endif /* LWIP_UDP */
#if LWIP_TCP
case NETCONN_TCP:
size = DEFAULT_TCP_RECVMBOX_SIZE;
break;
#endif /* LWIP_TCP */
default:
LWIP_ASSERT("netconn_alloc: undefined netconn_type", 0);
goto free_and_return;
}
if (sys_mbox_new(&conn->recvmbox, size) != ERR_OK) {
goto free_and_return;
}
#if !LWIP_NETCONN_SEM_PER_THREAD
if (sys_sem_new(&conn->op_completed, 0) != ERR_OK) {
sys_mbox_free(&conn->recvmbox);
goto free_and_return;
}
#endif
#if LWIP_TCP
sys_mbox_set_invalid(&conn->acceptmbox);
#endif
conn->state = NETCONN_NONE;
#if LWIP_SOCKET
/* initialize socket to -1 since 0 is a valid socket */
conn->socket = -1;
#endif /* LWIP_SOCKET */
conn->callback = callback;
#if LWIP_TCP
conn->current_msg = NULL;
conn->write_offset = 0;
#endif /* LWIP_TCP */
#if LWIP_SO_SNDTIMEO
conn->send_timeout = 0;
#endif /* LWIP_SO_SNDTIMEO */
#if LWIP_SO_RCVTIMEO
conn->recv_timeout = 0;
#endif /* LWIP_SO_RCVTIMEO */
#if LWIP_SO_RCVBUF
conn->recv_bufsize = RECV_BUFSIZE_DEFAULT;
conn->recv_avail = 0;
#endif /* LWIP_SO_RCVBUF */
#if LWIP_SO_LINGER
conn->linger = -1;
#endif /* LWIP_SO_LINGER */
conn->flags = 0;
return conn;
free_and_return:
memp_free(MEMP_NETCONN, conn);
return NULL;
}
/**
* Delete a netconn and all its resources.
* The pcb is NOT freed (since we might not be in the right thread context do this).
*
* @param conn the netconn to free
*/
void
netconn_free(struct netconn *conn)
{
LWIP_ASSERT("PCB must be deallocated outside this function", conn->pcb.tcp == NULL);
LWIP_ASSERT("recvmbox must be deallocated before calling this function",
!sys_mbox_valid(&conn->recvmbox));
#if LWIP_TCP
LWIP_ASSERT("acceptmbox must be deallocated before calling this function",
!sys_mbox_valid(&conn->acceptmbox));
#endif /* LWIP_TCP */
#if !LWIP_NETCONN_SEM_PER_THREAD
sys_sem_free(&conn->op_completed);
sys_sem_set_invalid(&conn->op_completed);
#endif
memp_free(MEMP_NETCONN, conn);
}
/**
* Delete rcvmbox and acceptmbox of a netconn and free the left-over data in
* these mboxes
*
* @param conn the netconn to free
* @bytes_drained bytes drained from recvmbox
* @accepts_drained pending connections drained from acceptmbox
*/
static void
netconn_drain(struct netconn *conn)
{
void *mem;
#if LWIP_TCP
struct pbuf *p;
#endif /* LWIP_TCP */
/* This runs in tcpip_thread, so we don't need to lock against rx packets */
/* Delete and drain the recvmbox. */
if (sys_mbox_valid(&conn->recvmbox)) {
while (sys_mbox_tryfetch(&conn->recvmbox, &mem) != SYS_MBOX_EMPTY) {
#if LWIP_TCP
if (NETCONNTYPE_GROUP(conn->type) == NETCONN_TCP) {
if (mem != NULL) {
p = (struct pbuf*)mem;
/* pcb might be set to NULL already by err_tcp() */
if (conn->pcb.tcp != NULL) {
tcp_recved(conn->pcb.tcp, p->tot_len);
}
pbuf_free(p);
}
} else
#endif /* LWIP_TCP */
{
netbuf_delete((struct netbuf *)mem);
}
}
sys_mbox_free(&conn->recvmbox);
sys_mbox_set_invalid(&conn->recvmbox);
}
/* Delete and drain the acceptmbox. */
#if LWIP_TCP
if (sys_mbox_valid(&conn->acceptmbox)) {
while (sys_mbox_tryfetch(&conn->acceptmbox, &mem) != SYS_MBOX_EMPTY) {
struct netconn *newconn = (struct netconn *)mem;
/* Only tcp pcbs have an acceptmbox, so no need to check conn->type */
/* pcb might be set to NULL already by err_tcp() */
if (conn->pcb.tcp != NULL) {
tcp_accepted(conn->pcb.tcp);
}
/* drain recvmbox */
netconn_drain(newconn);
if (newconn->pcb.tcp != NULL) {
tcp_abort(newconn->pcb.tcp);
newconn->pcb.tcp = NULL;
}
netconn_free(newconn);
}
sys_mbox_free(&conn->acceptmbox);
sys_mbox_set_invalid(&conn->acceptmbox);
}
#endif /* LWIP_TCP */
}
#if LWIP_TCP
/**
* Internal helper function to close a TCP netconn: since this sometimes
* doesn't work at the first attempt, this function is called from multiple
* places.
*
* @param conn the TCP netconn to close
* [@param delay 1 if called from sent/poll (wake up calling thread on end)]
*/
static err_t
lwip_netconn_do_close_internal(struct netconn *conn WRITE_DELAYED_PARAM SIG_CLOSE_PARAM)
{
err_t err;
u8_t shut, shut_rx, shut_tx, close;
u8_t close_finished = 0;
struct tcp_pcb* tpcb;
#if LWIP_SO_LINGER
u8_t linger_wait_required = 0;
#endif /* LWIP_SO_LINGER */
LWIP_ASSERT("invalid conn", (conn != NULL));
LWIP_ASSERT("this is for tcp netconns only", (NETCONNTYPE_GROUP(conn->type) == NETCONN_TCP));
LWIP_ASSERT("conn must be in state NETCONN_CLOSE", (conn->state == NETCONN_CLOSE));
LWIP_ASSERT("pcb already closed", (conn->pcb.tcp != NULL));
LWIP_ASSERT("conn->current_msg != NULL", conn->current_msg != NULL);
tpcb = conn->pcb.tcp;
shut = conn->current_msg->msg.sd.shut;
shut_rx = shut & NETCONN_SHUT_RD;
shut_tx = shut & NETCONN_SHUT_WR;
/* shutting down both ends is the same as closing
(also if RD or WR side was shut down before already) */
if (shut == NETCONN_SHUT_RDWR) {
close = 1;
} else if (shut_rx &&
((tpcb->state == FIN_WAIT_1) ||
(tpcb->state == FIN_WAIT_2) ||
(tpcb->state == CLOSING))) {
close = 1;
} else if (shut_tx && ((tpcb->flags & TF_RXCLOSED) != 0)) {
close = 1;
} else {
close = 0;
}
/* Set back some callback pointers */
if (close) {
tcp_arg(tpcb, NULL);
}
if (tpcb->state == LISTEN) {
tcp_accept(tpcb, NULL);
} else {
/* some callbacks have to be reset if tcp_close is not successful */
if (shut_rx) {
tcp_recv(tpcb, NULL);
tcp_accept(tpcb, NULL);
}
if (shut_tx) {
tcp_sent(tpcb, NULL);
}
if (close) {
tcp_poll(tpcb, NULL, 0);
tcp_err(tpcb, NULL);
}
}
/* Try to close the connection */
if (close) {
#if LWIP_SO_LINGER
/* check linger possibilites before calling tcp_close */
err = ERR_OK;
/* linger enabled/required at all? (i.e. is there untransmitted data left?) */
if ((conn->linger >= 0) && (conn->pcb.tcp->unsent || conn->pcb.tcp->unacked)) {
if ((conn->linger == 0)) {
/* data left but linger prevents waiting */
tcp_abort(tpcb);
tpcb = NULL;
} else if (conn->linger > 0) {
/* data left and linger says we should wait */
if (netconn_is_nonblocking(conn)) {
/* data left on a nonblocking netconn -> cannot linger */
err = ERR_WOULDBLOCK;
} else if ((s32_t)(sys_now() - conn->current_msg->msg.sd.time_started) >=
(conn->linger * 1000)) {
/* data left but linger timeout has expired (this happens on further
calls to this function through poll_tcp */
tcp_abort(tpcb);
tpcb = NULL;
} else {
/* data left -> need to wait for ACK after successful close */
linger_wait_required = 1;
}
}
}
if ((err == ERR_OK) && (tpcb != NULL))
#endif /* LWIP_SO_LINGER */
{
err = tcp_close(tpcb);
}
} else {
err = tcp_shutdown(tpcb, shut_rx, shut_tx);
}
if (err == ERR_OK) {
close_finished = 1;
#if LWIP_SO_LINGER
if (linger_wait_required) {
/* wait for ACK of all unsent/unacked data by just getting called again */
close_finished = 0;
err = ERR_INPROGRESS;
}
#endif /* LWIP_SO_LINGER */
} else {
if (err == ERR_MEM) {
/* Closing failed because of memory shortage */
if (netconn_is_nonblocking(conn)) {
/* Nonblocking close failed */
close_finished = 1;
err = ERR_WOULDBLOCK;
} else {
/* Blocking close, check the timeout */
#if LWIP_SO_SNDTIMEO || LWIP_SO_LINGER
s32_t close_timeout = LWIP_TCP_CLOSE_TIMEOUT_MS_DEFAULT;
/* this is kind of an lwip addition to the standard sockets: we wait
for some time when failing to allocate a segment for the FIN */
#if LWIP_SO_SNDTIMEO
if (conn->send_timeout > 0) {
close_timeout = conn->send_timeout;
}
#endif /* LWIP_SO_SNDTIMEO */
#if LWIP_SO_LINGER
if (conn->linger >= 0) {
/* use linger timeout (seconds) */
close_timeout = conn->linger * 1000U;
}
#endif
if ((s32_t)(sys_now() - conn->current_msg->msg.sd.time_started) >= close_timeout) {
#else /* LWIP_SO_SNDTIMEO || LWIP_SO_LINGER */
if (conn->current_msg->msg.sd.polls_left == 0) {
#endif /* LWIP_SO_SNDTIMEO || LWIP_SO_LINGER */
close_finished = 1;
if (close) {
/* in this case, we want to RST the connection */
tcp_abort(tpcb);
err = ERR_OK;
}
}
}
} else {
/* Closing failed for a non-memory error: give up */
close_finished = 1;
}
}
if (close_finished) {
/* Closing done (succeeded, non-memory error, nonblocking error or timeout) */
sys_sem_t* op_completed_sem = LWIP_API_MSG_SEM(conn->current_msg);
conn->current_msg->err = err;
conn->state = NETCONN_NONE;
if (err == ERR_OK) {
if (close) {
/* Set back some callback pointers as conn is going away */
conn->pcb.tcp = NULL;
/* Trigger select() in socket layer. Make sure everybody notices activity
on the connection, error first! */
API_EVENT(conn, NETCONN_EVT_ERROR, 0);
}
if (shut_rx) {
API_EVENT(conn, NETCONN_EVT_RCVPLUS, 0);
}
if (shut_tx) {
API_EVENT(conn, NETCONN_EVT_SENDPLUS, 0);
}
}
NETCONN_SET_SAFE_ERR(conn, err);
#if LWIP_TCPIP_CORE_LOCKING
if (delayed)
#endif
{
/* wake up the application task */
#if ESP_LWIP
if (sig_close) {
conn->current_msg = NULL;
sys_sem_signal(op_completed_sem);
}
#else
conn->current_msg = NULL;
sys_sem_signal(op_completed_sem);
#endif
}
return ERR_OK;
}
if (!close_finished) {
/* Closing failed and we want to wait: restore some of the callbacks */
/* Closing of listen pcb will never fail! */
LWIP_ASSERT("Closing a listen pcb may not fail!", (tpcb->state != LISTEN));
if (shut_tx) {
tcp_sent(tpcb, sent_tcp);
}
/* when waiting for close, set up poll interval to 500ms */
tcp_poll(tpcb, poll_tcp, 1);
tcp_err(tpcb, err_tcp);
tcp_arg(tpcb, conn);
/* don't restore recv callback: we don't want to receive any more data */
}
/* If closing didn't succeed, we get called again either
from poll_tcp or from sent_tcp */
LWIP_ASSERT("err != ERR_OK", err != ERR_OK);
return err;
}
#endif /* LWIP_TCP */
/**
* Delete the pcb inside a netconn.
* Called from netconn_delete.
*
* @param msg the api_msg_msg pointing to the connection
*/
void
lwip_netconn_do_delconn(void *m)
{
struct api_msg_msg *msg = (struct api_msg_msg*)m;
enum netconn_state state = msg->conn->state;
LWIP_ASSERT("netconn state error", /* this only happens for TCP netconns */
(state == NETCONN_NONE) || (NETCONNTYPE_GROUP(msg->conn->type) == NETCONN_TCP));
msg->err = ERR_OK;
#if LWIP_NETCONN_FULLDUPLEX
/* In full duplex mode, blocking write/connect is aborted with ERR_CLSD */
if (state != NETCONN_NONE) {
if ((state == NETCONN_WRITE) ||
((state == NETCONN_CONNECT) && !IN_NONBLOCKING_CONNECT(msg->conn))) {
/* close requested, abort running write/connect */
sys_sem_t* op_completed_sem;
LWIP_ASSERT("msg->conn->current_msg != NULL", msg->conn->current_msg != NULL);
op_completed_sem = LWIP_API_MSG_SEM(msg->conn->current_msg);
msg->conn->current_msg->err = ERR_CLSD;
msg->conn->current_msg = NULL;
msg->conn->write_offset = 0;
msg->conn->state = NETCONN_NONE;
NETCONN_SET_SAFE_ERR(msg->conn, ERR_CLSD);
msg->err = ERR_INPROGRESS;
sys_sem_signal(op_completed_sem);
}
}
#else /* LWIP_NETCONN_FULLDUPLEX */
if (((state != NETCONN_NONE) &&
(state != NETCONN_LISTEN) &&
(state != NETCONN_CONNECT)) ||
((state == NETCONN_CONNECT) && !IN_NONBLOCKING_CONNECT(msg->conn))) {
/* This means either a blocking write or blocking connect is running
(nonblocking write returns and sets state to NONE) */
msg->err = ERR_INPROGRESS;
} else
#endif /* LWIP_NETCONN_FULLDUPLEX */
{
/* Drain and delete mboxes */
netconn_drain(msg->conn);
if (msg->conn->pcb.tcp != NULL) {
switch (NETCONNTYPE_GROUP(msg->conn->type)) {
#if LWIP_RAW
case NETCONN_RAW:
raw_remove(msg->conn->pcb.raw);
break;
#endif /* LWIP_RAW */
#if LWIP_UDP
case NETCONN_UDP:
msg->conn->pcb.udp->recv_arg = NULL;
udp_remove(msg->conn->pcb.udp);
break;
#endif /* LWIP_UDP */
#if LWIP_TCP
case NETCONN_TCP:
LWIP_ASSERT("already writing or closing", msg->conn->current_msg == NULL &&
msg->conn->write_offset == 0);
msg->conn->state = NETCONN_CLOSE;
msg->msg.sd.shut = NETCONN_SHUT_RDWR;
msg->conn->current_msg = msg;
#if LWIP_TCPIP_CORE_LOCKING
if (lwip_netconn_do_close_internal(msg->conn, 0, SIG_CLOSE_TRUE) != ERR_OK) {
LWIP_ASSERT("state!", msg->conn->state == NETCONN_CLOSE);
UNLOCK_TCPIP_CORE();
sys_arch_sem_wait(LWIP_API_MSG_SEM(msg), 0);
LOCK_TCPIP_CORE();
LWIP_ASSERT("state!", msg->conn->state == NETCONN_NONE);
}
#else /* LWIP_TCPIP_CORE_LOCKING */
lwip_netconn_do_close_internal(msg->conn, SIG_CLOSE_TRUE);
#endif /* LWIP_TCPIP_CORE_LOCKING */
/* API_EVENT is called inside lwip_netconn_do_close_internal, before releasing
the application thread, so we can return at this point! */
return;
#endif /* LWIP_TCP */
default:
break;
}
msg->conn->pcb.tcp = NULL;
}
/* tcp netconns don't come here! */
/* @todo: this lets select make the socket readable and writable,
which is wrong! errfd instead? */
API_EVENT(msg->conn, NETCONN_EVT_RCVPLUS, 0);
API_EVENT(msg->conn, NETCONN_EVT_SENDPLUS, 0);
}
if (sys_sem_valid(LWIP_API_MSG_SEM(msg))) {
TCPIP_APIMSG_ACK(msg);
}
}
/**
* Bind a pcb contained in a netconn
* Called from netconn_bind.
*
* @param msg the api_msg_msg pointing to the connection and containing
* the IP address and port to bind to
*/
void
lwip_netconn_do_bind(void *m)
{
struct api_msg_msg *msg = (struct api_msg_msg*)m;
if (ERR_IS_FATAL(msg->conn->last_err)) {
msg->err = msg->conn->last_err;
} else {
msg->err = ERR_VAL;
if (msg->conn->pcb.tcp != NULL) {
const ip_addr_t *ipaddr = API_EXPR_REF(msg->msg.bc.ipaddr);
#if LWIP_IPV4 && LWIP_IPV6
/* "Socket API like" dual-stack support: If IP to bind to is IP6_ADDR_ANY,
* and NETCONN_FLAG_IPV6_V6ONLY is NOT set, use IP_ANY_TYPE to bind
*/
if (ip_addr_cmp(ipaddr, IP6_ADDR_ANY) &&
(netconn_get_ipv6only(msg->conn) == 0)) {
/* change PCB type to IPADDR_TYPE_ANY */
IP_SET_TYPE_VAL(msg->conn->pcb.ip->local_ip, IPADDR_TYPE_ANY);
IP_SET_TYPE_VAL(msg->conn->pcb.ip->remote_ip, IPADDR_TYPE_ANY);
/* bind to IPADDR_TYPE_ANY */
ipaddr = IP_ANY_TYPE;
}
#endif /* LWIP_IPV4 && LWIP_IPV6 */
switch (NETCONNTYPE_GROUP(msg->conn->type)) {
#if LWIP_RAW
case NETCONN_RAW:
msg->err = raw_bind(msg->conn->pcb.raw, ipaddr);
break;
#endif /* LWIP_RAW */
#if LWIP_UDP
case NETCONN_UDP:
msg->err = udp_bind(msg->conn->pcb.udp, ipaddr, msg->msg.bc.port);
break;
#endif /* LWIP_UDP */
#if LWIP_TCP
case NETCONN_TCP:
msg->err = tcp_bind(msg->conn->pcb.tcp, ipaddr, msg->msg.bc.port);
break;
#endif /* LWIP_TCP */
default:
break;
}
}
}
TCPIP_APIMSG_ACK(msg);
}
#if LWIP_TCP
/**
* TCP callback function if a connection (opened by tcp_connect/lwip_netconn_do_connect) has
* been established (or reset by the remote host).
*
* @see tcp.h (struct tcp_pcb.connected) for parameters and return values
*/
static err_t
lwip_netconn_do_connected(void *arg, struct tcp_pcb *pcb, err_t err)
{
struct netconn *conn;
int was_blocking;
sys_sem_t* op_completed_sem = NULL;
LWIP_UNUSED_ARG(pcb);
conn = (struct netconn *)arg;
if (conn == NULL) {
return ERR_VAL;
}
LWIP_ASSERT("conn->state == NETCONN_CONNECT", conn->state == NETCONN_CONNECT);
LWIP_ASSERT("(conn->current_msg != NULL) || conn->in_non_blocking_connect",
(conn->current_msg != NULL) || IN_NONBLOCKING_CONNECT(conn));
if (conn->current_msg != NULL) {
conn->current_msg->err = err;
op_completed_sem = LWIP_API_MSG_SEM(conn->current_msg);
}
if ((NETCONNTYPE_GROUP(conn->type) == NETCONN_TCP) && (err == ERR_OK)) {
setup_tcp(conn);
}
was_blocking = !IN_NONBLOCKING_CONNECT(conn);
SET_NONBLOCKING_CONNECT(conn, 0);
LWIP_ASSERT("blocking connect state error",
(was_blocking && op_completed_sem != NULL) ||
(!was_blocking && op_completed_sem == NULL));
conn->current_msg = NULL;
conn->state = NETCONN_NONE;
NETCONN_SET_SAFE_ERR(conn, ERR_OK);
API_EVENT(conn, NETCONN_EVT_SENDPLUS, 0);
if (was_blocking) {
sys_sem_signal(op_completed_sem);
}
return ERR_OK;
}
#endif /* LWIP_TCP */
/**
* Connect a pcb contained inside a netconn
* Called from netconn_connect.
*
* @param msg the api_msg_msg pointing to the connection and containing
* the IP address and port to connect to
*/
void
lwip_netconn_do_connect(void *m)
{
struct api_msg_msg *msg = (struct api_msg_msg*)m;
if (msg->conn->pcb.tcp == NULL) {
/* This may happen when calling netconn_connect() a second time */
msg->err = ERR_CLSD;
} else {
switch (NETCONNTYPE_GROUP(msg->conn->type)) {
#if LWIP_RAW
case NETCONN_RAW:
msg->err = raw_connect(msg->conn->pcb.raw, API_EXPR_REF(msg->msg.bc.ipaddr));
break;
#endif /* LWIP_RAW */
#if LWIP_UDP
case NETCONN_UDP:
msg->err = udp_connect(msg->conn->pcb.udp, API_EXPR_REF(msg->msg.bc.ipaddr), msg->msg.bc.port);
break;
#endif /* LWIP_UDP */
#if LWIP_TCP
case NETCONN_TCP:
/* Prevent connect while doing any other action. */
if (msg->conn->state == NETCONN_CONNECT) {
msg->err = ERR_ALREADY;
} else if (msg->conn->state != NETCONN_NONE) {
msg->err = ERR_ISCONN;
} else {
setup_tcp(msg->conn);
msg->err = tcp_connect(msg->conn->pcb.tcp, API_EXPR_REF(msg->msg.bc.ipaddr),
msg->msg.bc.port, lwip_netconn_do_connected);
if (msg->err == ERR_OK) {
u8_t non_blocking = netconn_is_nonblocking(msg->conn);
msg->conn->state = NETCONN_CONNECT;
SET_NONBLOCKING_CONNECT(msg->conn, non_blocking);
if (non_blocking) {
msg->err = ERR_INPROGRESS;
} else {
msg->conn->current_msg = msg;
/* sys_sem_signal() is called from lwip_netconn_do_connected (or err_tcp()),
when the connection is established! */
#if LWIP_TCPIP_CORE_LOCKING
LWIP_ASSERT("state!", msg->conn->state == NETCONN_CONNECT);
UNLOCK_TCPIP_CORE();
sys_arch_sem_wait(LWIP_API_MSG_SEM(msg), 0);
LOCK_TCPIP_CORE();
LWIP_ASSERT("state!", msg->conn->state != NETCONN_CONNECT);
#endif /* LWIP_TCPIP_CORE_LOCKING */
return;
}
}
}
break;
#endif /* LWIP_TCP */
default:
LWIP_ERROR("Invalid netconn type", 0, do{ msg->err = ERR_VAL; }while(0));
break;
}
}
/* For all other protocols, netconn_connect() calls TCPIP_APIMSG(),
so use TCPIP_APIMSG_ACK() here. */
TCPIP_APIMSG_ACK(msg);
}
/**
* Disconnect a pcb contained inside a netconn
* Only used for UDP netconns.
* Called from netconn_disconnect.
*
* @param msg the api_msg_msg pointing to the connection to disconnect
*/
void
lwip_netconn_do_disconnect(void *m)
{
struct api_msg_msg *msg = (struct api_msg_msg*)m;
#if LWIP_UDP
if (NETCONNTYPE_GROUP(msg->conn->type) == NETCONN_UDP) {
udp_disconnect(msg->conn->pcb.udp);
msg->err = ERR_OK;
} else
#endif /* LWIP_UDP */
{
msg->err = ERR_VAL;
}
TCPIP_APIMSG_ACK(msg);
}
#if LWIP_TCP
/**
* Set a TCP pcb contained in a netconn into listen mode
* Called from netconn_listen.
*
* @param msg the api_msg_msg pointing to the connection
*/
void
lwip_netconn_do_listen(void *m)
{
struct api_msg_msg *msg = (struct api_msg_msg*)m;
if (ERR_IS_FATAL(msg->conn->last_err)) {
msg->err = msg->conn->last_err;
} else {
msg->err = ERR_CONN;
if (msg->conn->pcb.tcp != NULL) {
if (NETCONNTYPE_GROUP(msg->conn->type) == NETCONN_TCP) {
if (msg->conn->state == NETCONN_NONE) {
struct tcp_pcb* lpcb;
if (msg->conn->pcb.tcp->state != CLOSED) {
/* connection is not closed, cannot listen */
msg->err = ERR_VAL;
} else {
#if LWIP_IPV4 && LWIP_IPV6
/* "Socket API like" dual-stack support: If IP to listen to is IP6_ADDR_ANY,
* and NETCONN_FLAG_IPV6_V6ONLY is NOT set, use IP_ANY_TYPE to listen
*/
if (ip_addr_cmp(&msg->conn->pcb.ip->local_ip, IP6_ADDR_ANY) &&
(netconn_get_ipv6only(msg->conn) == 0)) {
/* change PCB type to IPADDR_TYPE_ANY */
IP_SET_TYPE_VAL(msg->conn->pcb.tcp->local_ip, IPADDR_TYPE_ANY);
IP_SET_TYPE_VAL(msg->conn->pcb.tcp->remote_ip, IPADDR_TYPE_ANY);
}
#endif /* LWIP_IPV4 && LWIP_IPV6 */
#if TCP_LISTEN_BACKLOG
lpcb = tcp_listen_with_backlog(msg->conn->pcb.tcp, msg->msg.lb.backlog);
#else /* TCP_LISTEN_BACKLOG */
lpcb = tcp_listen(msg->conn->pcb.tcp);
#endif /* TCP_LISTEN_BACKLOG */
if (lpcb == NULL) {
/* in this case, the old pcb is still allocated */
msg->err = ERR_MEM;
} else {
/* delete the recvmbox and allocate the acceptmbox */
if (sys_mbox_valid(&msg->conn->recvmbox)) {
/** @todo: should we drain the recvmbox here? */
sys_mbox_free(&msg->conn->recvmbox);
sys_mbox_set_invalid(&msg->conn->recvmbox);
}
msg->err = ERR_OK;
if (!sys_mbox_valid(&msg->conn->acceptmbox)) {
msg->err = sys_mbox_new(&msg->conn->acceptmbox, DEFAULT_ACCEPTMBOX_SIZE);
}
if (msg->err == ERR_OK) {
msg->conn->state = NETCONN_LISTEN;
msg->conn->pcb.tcp = lpcb;
tcp_arg(msg->conn->pcb.tcp, msg->conn);
tcp_accept(msg->conn->pcb.tcp, accept_function);
} else {
/* since the old pcb is already deallocated, free lpcb now */
tcp_close(lpcb);
msg->conn->pcb.tcp = NULL;
}
}
}
} else if (msg->conn->state == NETCONN_LISTEN) {
/* already listening, allow updating of the backlog */
msg->err = ERR_OK;
#if TCP_LISTEN_BACKLOG
tcp_backlog_set(msg->conn->pcb.tcp, msg->msg.lb.backlog);
#endif /* TCP_LISTEN_BACKLOG */
}
} else {
msg->err = ERR_ARG;
}
}
}
TCPIP_APIMSG_ACK(msg);
}
#endif /* LWIP_TCP */
/**
* Send some data on a RAW or UDP pcb contained in a netconn
* Called from netconn_send
*
* @param msg the api_msg_msg pointing to the connection
*/
void
lwip_netconn_do_send(void *m)
{
struct api_msg_msg *msg = (struct api_msg_msg*)m;
if (ERR_IS_FATAL(msg->conn->last_err)) {
msg->err = msg->conn->last_err;
#if LWIP_IPV4 && LWIP_IPV6
} else if ((msg->conn->flags & NETCONN_FLAG_IPV6_V6ONLY) &&
IP_IS_V4MAPPEDV6(&msg->msg.b->addr)) {
LWIP_DEBUGF(API_MSG_DEBUG, ("lwip_netconn_do_send: Dropping IPv4 packet on IPv6-only socket"));
msg->err = ERR_VAL;
#endif /* LWIP_IPV4 && LWIP_IPV6 */
} else {
msg->err = ERR_CONN;
if (msg->conn->pcb.tcp != NULL) {
switch (NETCONNTYPE_GROUP(msg->conn->type)) {
#if LWIP_RAW
case NETCONN_RAW:
if (ip_addr_isany(&msg->msg.b->addr)) {
msg->err = raw_send(msg->conn->pcb.raw, msg->msg.b->p);
} else {
msg->err = raw_sendto(msg->conn->pcb.raw, msg->msg.b->p, &msg->msg.b->addr);
}
break;
#endif
#if LWIP_UDP
case NETCONN_UDP:
#if LWIP_CHECKSUM_ON_COPY
if (ip_addr_isany(&msg->msg.b->addr) || IP_IS_ANY_TYPE_VAL(msg->msg.b->addr)) {
msg->err = udp_send_chksum(msg->conn->pcb.udp, msg->msg.b->p,
msg->msg.b->flags & NETBUF_FLAG_CHKSUM, msg->msg.b->toport_chksum);
} else {
msg->err = udp_sendto_chksum(msg->conn->pcb.udp, msg->msg.b->p,
&msg->msg.b->addr, msg->msg.b->port,
msg->msg.b->flags & NETBUF_FLAG_CHKSUM, msg->msg.b->toport_chksum);
}
#else /* LWIP_CHECKSUM_ON_COPY */
if (ip_addr_isany_val(msg->msg.b->addr) || IP_IS_ANY_TYPE_VAL(msg->msg.b->addr)) {
msg->err = udp_send(msg->conn->pcb.udp, msg->msg.b->p);
} else {
msg->err = udp_sendto(msg->conn->pcb.udp, msg->msg.b->p, &msg->msg.b->addr, msg->msg.b->port);
}
#endif /* LWIP_CHECKSUM_ON_COPY */
break;
#endif /* LWIP_UDP */
default:
break;
}
}
}
TCPIP_APIMSG_ACK(msg);
}
#if LWIP_TCP
/**
* Indicate data has been received from a TCP pcb contained in a netconn
* Called from netconn_recv
*
* @param msg the api_msg_msg pointing to the connection
*/
void
lwip_netconn_do_recv(void *m)
{
struct api_msg_msg *msg = (struct api_msg_msg*)m;
msg->err = ERR_OK;
if (msg->conn->pcb.tcp != NULL) {
if (NETCONNTYPE_GROUP(msg->conn->type) == NETCONN_TCP) {
#if TCP_LISTEN_BACKLOG
if (msg->conn->pcb.tcp->state == LISTEN) {
tcp_accepted(msg->conn->pcb.tcp);
} else
#endif /* TCP_LISTEN_BACKLOG */
{
u32_t remaining = msg->msg.r.len;
do {
u16_t recved = (remaining > 0xffff) ? 0xffff : (u16_t)remaining;
tcp_recved(msg->conn->pcb.tcp, recved);
remaining -= recved;
} while (remaining != 0);
}
}
}
TCPIP_APIMSG_ACK(msg);
}
/**
* See if more data needs to be written from a previous call to netconn_write.
* Called initially from lwip_netconn_do_write. If the first call can't send all data
* (because of low memory or empty send-buffer), this function is called again
* from sent_tcp() or poll_tcp() to send more data. If all data is sent, the
* blocking application thread (waiting in netconn_write) is released.
*
* @param conn netconn (that is currently in state NETCONN_WRITE) to process
* [@param delay 1 if called from sent/poll (wake up calling thread on end)]
* @return ERR_OK
* ERR_MEM if LWIP_TCPIP_CORE_LOCKING=1 and sending hasn't yet finished
*/
static err_t
lwip_netconn_do_writemore(struct netconn *conn WRITE_DELAYED_PARAM)
{
err_t err;
const void *dataptr;
u16_t len, available;
u8_t write_finished = 0;
size_t diff;
u8_t dontblock;
u8_t apiflags;
LWIP_ASSERT("conn != NULL", conn != NULL);
LWIP_ASSERT("conn->state == NETCONN_WRITE", (conn->state == NETCONN_WRITE));
LWIP_ASSERT("conn->current_msg != NULL", conn->current_msg != NULL);
LWIP_ASSERT("conn->pcb.tcp != NULL", conn->pcb.tcp != NULL);
LWIP_ASSERT("conn->write_offset < conn->current_msg->msg.w.len",
conn->write_offset < conn->current_msg->msg.w.len);
dontblock = netconn_is_nonblocking(conn) ||
(conn->current_msg->msg.w.apiflags & NETCONN_DONTBLOCK);
apiflags = conn->current_msg->msg.w.apiflags;
#if LWIP_SO_SNDTIMEO
if ((conn->send_timeout != 0) &&
((s32_t)(sys_now() - conn->current_msg->msg.w.time_started) >= conn->send_timeout)) {
write_finished = 1;
if (conn->write_offset == 0) {
/* nothing has been written */
err = ERR_WOULDBLOCK;
conn->current_msg->msg.w.len = 0;
} else {
/* partial write */
err = ERR_OK;
conn->current_msg->msg.w.len = conn->write_offset;
conn->write_offset = 0;
}
} else
#endif /* LWIP_SO_SNDTIMEO */
{
dataptr = (const u8_t*)conn->current_msg->msg.w.dataptr + conn->write_offset;
diff = conn->current_msg->msg.w.len - conn->write_offset;
if (diff > 0xffffUL) { /* max_u16_t */
len = 0xffff;
apiflags |= TCP_WRITE_FLAG_MORE;
} else {
len = (u16_t)diff;
}
available = tcp_sndbuf(conn->pcb.tcp);
if (available < len) {
/* don't try to write more than sendbuf */
len = available;
if (dontblock) {
if (!len) {
err = ERR_WOULDBLOCK;
goto err_mem;
}
} else {
apiflags |= TCP_WRITE_FLAG_MORE;
}
}
LWIP_ASSERT("lwip_netconn_do_writemore: invalid length!", ((conn->write_offset + len) <= conn->current_msg->msg.w.len));
err = tcp_write(conn->pcb.tcp, dataptr, len, apiflags);
/* if OK or memory error, check available space */
if ((err == ERR_OK) || (err == ERR_MEM)) {
err_mem:
if (dontblock && (len < conn->current_msg->msg.w.len)) {
/* non-blocking write did not write everything: mark the pcb non-writable
and let poll_tcp check writable space to mark the pcb writable again */
API_EVENT(conn, NETCONN_EVT_SENDMINUS, len);
conn->flags |= NETCONN_FLAG_CHECK_WRITESPACE;
} else if ((tcp_sndbuf(conn->pcb.tcp) <= TCP_SNDLOWAT(conn->pcb.tcp)) ||
(tcp_sndqueuelen(conn->pcb.tcp) >= TCP_SNDQUEUELOWAT(conn->pcb.tcp))) {
/* The queued byte- or pbuf-count exceeds the configured low-water limit,
let select mark this pcb as non-writable. */
API_EVENT(conn, NETCONN_EVT_SENDMINUS, len);
}
}
if (err == ERR_OK) {
err_t out_err;
conn->write_offset += len;
if ((conn->write_offset == conn->current_msg->msg.w.len) || dontblock) {
/* return sent length */
conn->current_msg->msg.w.len = conn->write_offset;
/* everything was written */
write_finished = 1;
}
out_err = tcp_output(conn->pcb.tcp);
if (ERR_IS_FATAL(out_err) || (out_err == ERR_RTE)) {
/* If tcp_output fails with fatal error or no route is found,
don't try writing any more but return the error
to the application thread. */
err = out_err;
write_finished = 1;
conn->current_msg->msg.w.len = 0;
}
} else if ((err == ERR_MEM) && !dontblock) {
/* If ERR_MEM, we wait for sent_tcp or poll_tcp to be called
we do NOT return to the application thread, since ERR_MEM is
only a temporary error! */
/* tcp_write returned ERR_MEM, try tcp_output anyway */
err_t out_err = tcp_output(conn->pcb.tcp);
if (ERR_IS_FATAL(out_err) || (out_err == ERR_RTE)) {
/* If tcp_output fails with fatal error or no route is found,
don't try writing any more but return the error
to the application thread. */
err = out_err;
write_finished = 1;
conn->current_msg->msg.w.len = 0;
} else {
}
} else {
/* On errors != ERR_MEM, we don't try writing any more but return
the error to the application thread. */
write_finished = 1;
conn->current_msg->msg.w.len = 0;
}
}
if (write_finished) {
/* everything was written: set back connection state
and back to application task */
sys_sem_t* op_completed_sem = LWIP_API_MSG_SEM(conn->current_msg);
conn->current_msg->err = err;
conn->current_msg = NULL;
conn->write_offset = 0;
conn->state = NETCONN_NONE;
NETCONN_SET_SAFE_ERR(conn, err);
#if LWIP_TCPIP_CORE_LOCKING
if (delayed)
#endif
{
sys_sem_signal(op_completed_sem);
}
}
#if LWIP_TCPIP_CORE_LOCKING
else {
return ERR_MEM;
}
#endif
return ERR_OK;
}
#endif /* LWIP_TCP */
/**
* Send some data on a TCP pcb contained in a netconn
* Called from netconn_write
*
* @param msg the api_msg_msg pointing to the connection
*/
void
lwip_netconn_do_write(void *m)
{
struct api_msg_msg *msg = (struct api_msg_msg*)m;
if (ERR_IS_FATAL(msg->conn->last_err)) {
msg->err = msg->conn->last_err;
} else {
if (NETCONNTYPE_GROUP(msg->conn->type) == NETCONN_TCP) {
#if LWIP_TCP
if (msg->conn->state != NETCONN_NONE) {
/* netconn is connecting, closing or in blocking write */
msg->err = ERR_INPROGRESS;
} else if (msg->conn->pcb.tcp != NULL) {
msg->conn->state = NETCONN_WRITE;
/* set all the variables used by lwip_netconn_do_writemore */
LWIP_ASSERT("already writing or closing", msg->conn->current_msg == NULL &&
msg->conn->write_offset == 0);
LWIP_ASSERT("msg->msg.w.len != 0", msg->msg.w.len != 0);
msg->conn->current_msg = msg;
msg->conn->write_offset = 0;
#if LWIP_TCPIP_CORE_LOCKING
if (lwip_netconn_do_writemore(msg->conn, 0) != ERR_OK) {
LWIP_ASSERT("state!", msg->conn->state == NETCONN_WRITE);
UNLOCK_TCPIP_CORE();
sys_arch_sem_wait(LWIP_API_MSG_SEM(msg), 0);
LOCK_TCPIP_CORE();
LWIP_ASSERT("state!", msg->conn->state != NETCONN_WRITE);
}
#else /* LWIP_TCPIP_CORE_LOCKING */
lwip_netconn_do_writemore(msg->conn);
#endif /* LWIP_TCPIP_CORE_LOCKING */
/* for both cases: if lwip_netconn_do_writemore was called, don't ACK the APIMSG
since lwip_netconn_do_writemore ACKs it! */
return;
} else {
msg->err = ERR_CONN;
}
#else /* LWIP_TCP */
msg->err = ERR_VAL;
#endif /* LWIP_TCP */
#if (LWIP_UDP || LWIP_RAW)
} else {
msg->err = ERR_VAL;
#endif /* (LWIP_UDP || LWIP_RAW) */
}
}
TCPIP_APIMSG_ACK(msg);
}
/**
* Return a connection's local or remote address
* Called from netconn_getaddr
*
* @param msg the api_msg_msg pointing to the connection
*/
void
lwip_netconn_do_getaddr(void *m)
{
struct api_msg_msg *msg = (struct api_msg_msg*)m;
if (msg->conn->pcb.ip != NULL) {
if (msg->msg.ad.local) {
ip_addr_copy(API_EXPR_DEREF(msg->msg.ad.ipaddr),
msg->conn->pcb.ip->local_ip);
} else {
ip_addr_copy(API_EXPR_DEREF(msg->msg.ad.ipaddr),
msg->conn->pcb.ip->remote_ip);
}
msg->err = ERR_OK;
switch (NETCONNTYPE_GROUP(msg->conn->type)) {
#if LWIP_RAW
case NETCONN_RAW:
if (msg->msg.ad.local) {
API_EXPR_DEREF(msg->msg.ad.port) = msg->conn->pcb.raw->protocol;
} else {
/* return an error as connecting is only a helper for upper layers */
msg->err = ERR_CONN;
}
break;
#endif /* LWIP_RAW */
#if LWIP_UDP
case NETCONN_UDP:
if (msg->msg.ad.local) {
API_EXPR_DEREF(msg->msg.ad.port) = msg->conn->pcb.udp->local_port;
} else {
if ((msg->conn->pcb.udp->flags & UDP_FLAGS_CONNECTED) == 0) {
msg->err = ERR_CONN;
} else {
API_EXPR_DEREF(msg->msg.ad.port) = msg->conn->pcb.udp->remote_port;
}
}
break;
#endif /* LWIP_UDP */
#if LWIP_TCP
case NETCONN_TCP:
if ((msg->msg.ad.local == 0) &&
((msg->conn->pcb.tcp->state == CLOSED) || (msg->conn->pcb.tcp->state == LISTEN))) {
/* pcb is not connected and remote name is requested */
msg->err = ERR_CONN;
} else {
API_EXPR_DEREF(msg->msg.ad.port) = (msg->msg.ad.local ? msg->conn->pcb.tcp->local_port : msg->conn->pcb.tcp->remote_port);
}
break;
#endif /* LWIP_TCP */
default:
LWIP_ASSERT("invalid netconn_type", 0);
break;
}
} else {
msg->err = ERR_CONN;
}
TCPIP_APIMSG_ACK(msg);
}
/**
* Close or half-shutdown a TCP pcb contained in a netconn
* Called from netconn_close
* In contrast to closing sockets, the netconn is not deallocated.
*
* @param msg the api_msg_msg pointing to the connection
*/
void
lwip_netconn_do_close(void *m)
{
struct api_msg_msg *msg = (struct api_msg_msg*)m;
#if LWIP_TCP
enum netconn_state state = msg->conn->state;
/* First check if this is a TCP netconn and if it is in a correct state
(LISTEN doesn't support half shutdown) */
if ((msg->conn->pcb.tcp != NULL) &&
(NETCONNTYPE_GROUP(msg->conn->type) == NETCONN_TCP) &&
((msg->msg.sd.shut == NETCONN_SHUT_RDWR) || (state != NETCONN_LISTEN))) {
/* Check if we are in a connected state */
if (state == NETCONN_CONNECT) {
/* TCP connect in progress: cannot shutdown */
msg->err = ERR_CONN;
} else if (state == NETCONN_WRITE) {
#if LWIP_NETCONN_FULLDUPLEX
if (msg->msg.sd.shut & NETCONN_SHUT_WR) {
/* close requested, abort running write */
sys_sem_t* op_completed_sem;
LWIP_ASSERT("msg->conn->current_msg != NULL", msg->conn->current_msg != NULL);
op_completed_sem = LWIP_API_MSG_SEM(msg->conn->current_msg);
msg->conn->current_msg->err = ERR_CLSD;
msg->conn->current_msg = NULL;
msg->conn->write_offset = 0;
msg->conn->state = NETCONN_NONE;
NETCONN_SET_SAFE_ERR(msg->conn, ERR_CLSD);
sys_sem_signal(op_completed_sem);
} else {
LWIP_ASSERT("msg->msg.sd.shut == NETCONN_SHUT_RD", msg->msg.sd.shut == NETCONN_SHUT_RD);
/* In this case, let the write continue and do not interfere with
conn->current_msg or conn->state! */
msg->err = tcp_shutdown(msg->conn->pcb.tcp, 1, 0);
}
#else /* LWIP_NETCONN_FULLDUPLEX */
msg->err = ERR_INPROGRESS;
#endif /* LWIP_NETCONN_FULLDUPLEX */
} else {
if (msg->msg.sd.shut & NETCONN_SHUT_RD) {
/* Drain and delete mboxes */
netconn_drain(msg->conn);
}
LWIP_ASSERT("already writing or closing", msg->conn->current_msg == NULL &&
msg->conn->write_offset == 0);
msg->conn->state = NETCONN_CLOSE;
msg->conn->current_msg = msg;
#if LWIP_TCPIP_CORE_LOCKING
if (lwip_netconn_do_close_internal(msg->conn, 0, SIG_CLOSE_TRUE) != ERR_OK) {
LWIP_ASSERT("state!", msg->conn->state == NETCONN_CLOSE);
UNLOCK_TCPIP_CORE();
sys_arch_sem_wait(LWIP_API_MSG_SEM(msg), 0);
LOCK_TCPIP_CORE();
LWIP_ASSERT("state!", msg->conn->state == NETCONN_NONE);
}
#else /* LWIP_TCPIP_CORE_LOCKING */
lwip_netconn_do_close_internal(msg->conn, SIG_CLOSE_TRUE);
#endif /* LWIP_TCPIP_CORE_LOCKING */
/* for tcp netconns, lwip_netconn_do_close_internal ACKs the message */
return;
}
} else
#endif /* LWIP_TCP */
{
msg->err = ERR_CONN;
}
TCPIP_APIMSG_ACK(msg);
}
#if LWIP_IGMP || (LWIP_IPV6 && LWIP_IPV6_MLD)
/**
* Join multicast groups for UDP netconns.
* Called from netconn_join_leave_group
*
* @param msg the api_msg_msg pointing to the connection
*/
void
lwip_netconn_do_join_leave_group(void *m)
{
struct api_msg_msg *msg = (struct api_msg_msg*)m;
if (ERR_IS_FATAL(msg->conn->last_err)) {
msg->err = msg->conn->last_err;
} else {
if (msg->conn->pcb.tcp != NULL) {
if (NETCONNTYPE_GROUP(msg->conn->type) == NETCONN_UDP) {
#if LWIP_UDP
#if LWIP_IPV6 && LWIP_IPV6_MLD
if (NETCONNTYPE_ISIPV6(msg->conn->type)) {
if (msg->msg.jl.join_or_leave == NETCONN_JOIN) {
msg->err = mld6_joingroup(ip_2_ip6(API_EXPR_REF(msg->msg.jl.netif_addr)),
ip_2_ip6(API_EXPR_REF(msg->msg.jl.multiaddr)));
} else {
msg->err = mld6_leavegroup(ip_2_ip6(API_EXPR_REF(msg->msg.jl.netif_addr)),
ip_2_ip6(API_EXPR_REF(msg->msg.jl.multiaddr)));
}
}
else
#endif /* LWIP_IPV6 && LWIP_IPV6_MLD */
{
#if LWIP_IGMP
if (msg->msg.jl.join_or_leave == NETCONN_JOIN) {
msg->err = igmp_joingroup(ip_2_ip4(API_EXPR_REF(msg->msg.jl.netif_addr)),
ip_2_ip4(API_EXPR_REF(msg->msg.jl.multiaddr)));
} else {
msg->err = igmp_leavegroup(ip_2_ip4(API_EXPR_REF(msg->msg.jl.netif_addr)),
ip_2_ip4(API_EXPR_REF(msg->msg.jl.multiaddr)));
}
#endif /* LWIP_IGMP */
}
#endif /* LWIP_UDP */
#if (LWIP_TCP || LWIP_RAW)
} else {
msg->err = ERR_VAL;
#endif /* (LWIP_TCP || LWIP_RAW) */
}
} else {
msg->err = ERR_CONN;
}
}
TCPIP_APIMSG_ACK(msg);
}
#endif /* LWIP_IGMP || (LWIP_IPV6 && LWIP_IPV6_MLD) */
#if LWIP_DNS
/**
* Callback function that is called when DNS name is resolved
* (or on timeout). A waiting application thread is waked up by
* signaling the semaphore.
*/
static void
lwip_netconn_do_dns_found(const char *name, const ip_addr_t *ipaddr, void *arg)
{
struct dns_api_msg *msg = (struct dns_api_msg*)arg;
/* we trust the internal implementation to be correct :-) */
LWIP_UNUSED_ARG(name);
if (ipaddr == NULL) {
/* timeout or memory error */
API_EXPR_DEREF(msg->err) = ERR_VAL;
} else {
/* address was resolved */
API_EXPR_DEREF(msg->err) = ERR_OK;
API_EXPR_DEREF(msg->addr) = *ipaddr;
}
/* wake up the application task waiting in netconn_gethostbyname */
sys_sem_signal(API_EXPR_REF_SEM(msg->sem));
}
/**
* Execute a DNS query
* Called from netconn_gethostbyname
*
* @param arg the dns_api_msg pointing to the query
*/
void
lwip_netconn_do_gethostbyname(void *arg)
{
struct dns_api_msg *msg = (struct dns_api_msg*)arg;
u8_t addrtype =
#if LWIP_IPV4 && LWIP_IPV6
msg->dns_addrtype;
#else
LWIP_DNS_ADDRTYPE_DEFAULT;
#endif
API_EXPR_DEREF(msg->err) = dns_gethostbyname_addrtype(msg->name,
API_EXPR_REF(msg->addr), lwip_netconn_do_dns_found, msg, addrtype);
if (API_EXPR_DEREF(msg->err) != ERR_INPROGRESS) {
/* on error or immediate success, wake up the application
* task waiting in netconn_gethostbyname */
sys_sem_signal(API_EXPR_REF_SEM(msg->sem));
}
}
#endif /* LWIP_DNS */
#endif /* LWIP_NETCONN */
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