wip
Dependents: EthernetInterface_vz
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api/api_msg.c
- Committer:
- mbed_official
- Date:
- 2012-06-22
- Revision:
- 0:51ac1d130fd4
File content as of revision 0:51ac1d130fd4:
/** * @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/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/tcpip.h" #include "lwip/igmp.h" #include "lwip/dns.h" #include <string.h> #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 static err_t do_writemore(struct netconn *conn); static void do_close_internal(struct netconn *conn); #endif #if LWIP_RAW /** * Receive callback function for RAW netconns. * Doesn't 'eat' the packet, only references 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, 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) { 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, 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; } 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 { const struct ip_hdr* iphdr = ip_current_header(); /* get the UDP header - always in the first pbuf, ensured by udp_input */ const struct udp_hdr* udphdr = (void*)(((char*)iphdr) + IPH_LEN(iphdr)); #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 */ } len = p->tot_len; if (sys_mbox_trypost(&conn->recvmbox, buf) != ERR_OK) { 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; LWIP_ASSERT("recv_tcp: recv for wrong pcb!", conn->pcb.tcp == pcb); if (conn == NULL) { return ERR_VAL; } 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! */ 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) { /* 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; LWIP_UNUSED_ARG(pcb); LWIP_ASSERT("conn != NULL", (conn != NULL)); if (conn->state == NETCONN_WRITE) { do_writemore(conn); } else if (conn->state == NETCONN_CLOSE) { do_close_internal(conn); } /* @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) && (tcp_sndqueuelen(conn->pcb.tcp) < TCP_SNDQUEUELOWAT)) { conn->flags &= ~NETCONN_FLAG_CHECK_WRITESPACE; API_EVENT(conn, NETCONN_EVT_SENDPLUS, 0); } } 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; LWIP_UNUSED_ARG(pcb); LWIP_ASSERT("conn != NULL", (conn != NULL)); if (conn->state == NETCONN_WRITE) { do_writemore(conn); } else if (conn->state == NETCONN_CLOSE) { do_close_internal(conn); } if (conn) { /* 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) && (tcp_sndqueuelen(conn->pcb.tcp) < TCP_SNDQUEUELOWAT)) { conn->flags &= ~NETCONN_FLAG_CHECK_WRITESPACE; API_EVENT(conn, NETCONN_EVT_SENDPLUS, len); } } 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; SYS_ARCH_DECL_PROTECT(lev); conn = (struct netconn *)arg; LWIP_ASSERT("conn != NULL", (conn != NULL)); conn->pcb.tcp = NULL; /* no check since this is always fatal! */ SYS_ARCH_PROTECT(lev); conn->last_err = err; SYS_ARCH_UNPROTECT(lev); /* reset conn->state now before waking up other threads */ old_state = conn->state; conn->state = NETCONN_NONE; /* 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 */ sys_mbox_trypost(&conn->recvmbox, NULL); } /* pass NULL-message to acceptmbox to wake up pending accept */ if (sys_mbox_valid(&conn->acceptmbox)) { /* use trypost to preven deadlock */ sys_mbox_trypost(&conn->acceptmbox, NULL); } if ((old_state == NETCONN_WRITE) || (old_state == NETCONN_CLOSE) || (old_state == NETCONN_CONNECT)) { /* calling do_writemore/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) { /* set error return code */ LWIP_ASSERT("conn->current_msg != NULL", conn->current_msg != NULL); conn->current_msg->err = err; conn->current_msg = NULL; /* wake up the waiting task */ sys_sem_signal(&conn->op_completed); } } 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, 4); 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) { /* When returning != ERR_OK, the pcb is aborted in tcp_process(), so do nothing here! */ 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 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) { msg->err = ERR_MEM; break; } 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) { msg->err = ERR_MEM; break; } #if LWIP_UDPLITE if (msg->conn->type==NETCONN_UDPLITE) { udp_setflags(msg->conn->pcb.udp, UDP_FLAGS_UDPLITE); } #endif /* LWIP_UDPLITE */ if (msg->conn->type==NETCONN_UDPNOCHKSUM) { 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) { msg->err = ERR_MEM; break; } setup_tcp(msg->conn); break; #endif /* LWIP_TCP */ default: /* Unsupported netconn type, e.g. protocol disabled */ msg->err = ERR_VAL; break; } } /** * 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 do_newconn(struct api_msg_msg *msg) { 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 (DEFAULT_RAW_RECVMBOX_SIZE == DEFAULT_UDP_RECVMBOX_SIZE) && \ (DEFAULT_RAW_RECVMBOX_SIZE == DEFAULT_TCP_RECVMBOX_SIZE) size = DEFAULT_RAW_RECVMBOX_SIZE; #else 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); break; } #endif if (sys_sem_new(&conn->op_completed, 0) != ERR_OK) { memp_free(MEMP_NETCONN, conn); return NULL; } if (sys_mbox_new(&conn->recvmbox, size) != ERR_OK) { sys_sem_free(&conn->op_completed); memp_free(MEMP_NETCONN, conn); return NULL; } #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_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 */ conn->flags = 0; return conn; } /** * 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 */ sys_sem_free(&conn->op_completed); sys_sem_set_invalid(&conn->op_completed); 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 (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 */ static void do_close_internal(struct netconn *conn) { err_t err; u8_t shut, shut_rx, shut_tx, close; LWIP_ASSERT("invalid conn", (conn != NULL)); LWIP_ASSERT("this is for tcp netconns only", (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); 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 */ close = shut == NETCONN_SHUT_RDWR; /* Set back some callback pointers */ if (close) { tcp_arg(conn->pcb.tcp, NULL); } if (conn->pcb.tcp->state == LISTEN) { tcp_accept(conn->pcb.tcp, NULL); } else { /* some callbacks have to be reset if tcp_close is not successful */ if (shut_rx) { tcp_recv(conn->pcb.tcp, NULL); tcp_accept(conn->pcb.tcp, NULL); } if (shut_tx) { tcp_sent(conn->pcb.tcp, NULL); } if (close) { tcp_poll(conn->pcb.tcp, NULL, 4); tcp_err(conn->pcb.tcp, NULL); } } /* Try to close the connection */ if (shut == NETCONN_SHUT_RDWR) { err = tcp_close(conn->pcb.tcp); } else { err = tcp_shutdown(conn->pcb.tcp, shut & NETCONN_SHUT_RD, shut & NETCONN_SHUT_WR); } if (err == ERR_OK) { /* Closing succeeded */ conn->current_msg->err = ERR_OK; conn->current_msg = NULL; conn->state = NETCONN_NONE; /* 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! */ if (close) { 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); } /* wake up the application task */ sys_sem_signal(&conn->op_completed); } else { /* Closing failed, restore some of the callbacks */ /* Closing of listen pcb will never fail! */ LWIP_ASSERT("Closing a listen pcb may not fail!", (conn->pcb.tcp->state != LISTEN)); tcp_sent(conn->pcb.tcp, sent_tcp); tcp_poll(conn->pcb.tcp, poll_tcp, 4); tcp_err(conn->pcb.tcp, err_tcp); tcp_arg(conn->pcb.tcp, 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 */ } #endif /* LWIP_TCP */ /** * Delete the pcb inside a netconn. * Called from netconn_delete. * * @param msg the api_msg_msg pointing to the connection */ void do_delconn(struct api_msg_msg *msg) { /* @todo TCP: abort running write/connect? */ if ((msg->conn->state != NETCONN_NONE) && (msg->conn->state != NETCONN_LISTEN) && (msg->conn->state != NETCONN_CONNECT)) { /* this only happens for TCP netconns */ LWIP_ASSERT("msg->conn->type == NETCONN_TCP", msg->conn->type == NETCONN_TCP); msg->err = ERR_INPROGRESS; } else { LWIP_ASSERT("blocking connect in progress", (msg->conn->state != NETCONN_CONNECT) || IN_NONBLOCKING_CONNECT(msg->conn)); /* 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; do_close_internal(msg->conn); /* API_EVENT is called inside 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(&msg->conn->op_completed)) { sys_sem_signal(&msg->conn->op_completed); } } /** * 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 do_bind(struct api_msg_msg *msg) { 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) { switch (NETCONNTYPE_GROUP(msg->conn->type)) { #if LWIP_RAW case NETCONN_RAW: msg->err = raw_bind(msg->conn->pcb.raw, msg->msg.bc.ipaddr); break; #endif /* LWIP_RAW */ #if LWIP_UDP case NETCONN_UDP: msg->err = udp_bind(msg->conn->pcb.udp, msg->msg.bc.ipaddr, msg->msg.bc.port); break; #endif /* LWIP_UDP */ #if LWIP_TCP case NETCONN_TCP: msg->err = tcp_bind(msg->conn->pcb.tcp, msg->msg.bc.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/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 do_connected(void *arg, struct tcp_pcb *pcb, err_t err) { struct netconn *conn; int was_blocking; 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; } if ((conn->type == NETCONN_TCP) && (err == ERR_OK)) { setup_tcp(conn); } was_blocking = !IN_NONBLOCKING_CONNECT(conn); SET_NONBLOCKING_CONNECT(conn, 0); conn->current_msg = NULL; conn->state = NETCONN_NONE; if (!was_blocking) { NETCONN_SET_SAFE_ERR(conn, ERR_OK); } API_EVENT(conn, NETCONN_EVT_SENDPLUS, 0); if (was_blocking) { sys_sem_signal(&conn->op_completed); } 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 do_connect(struct api_msg_msg *msg) { 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, msg->msg.bc.ipaddr); break; #endif /* LWIP_RAW */ #if LWIP_UDP case NETCONN_UDP: msg->err = udp_connect(msg->conn->pcb.udp, 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_NONE) { msg->err = ERR_ISCONN; } else { setup_tcp(msg->conn); msg->err = tcp_connect(msg->conn->pcb.tcp, msg->msg.bc.ipaddr, msg->msg.bc.port, 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 do_connected (or err_tcp()), * when the connection is established! */ return; } } } break; #endif /* LWIP_TCP */ default: LWIP_ERROR("Invalid netconn type", 0, do{ msg->err = ERR_VAL; }while(0)); break; } } sys_sem_signal(&msg->conn->op_completed); } /** * Connect 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 do_disconnect(struct api_msg_msg *msg) { #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 do_listen(struct api_msg_msg *msg) { 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 (msg->conn->type == NETCONN_TCP) { if (msg->conn->state == NETCONN_NONE) { #if TCP_LISTEN_BACKLOG struct tcp_pcb* lpcb = tcp_listen_with_backlog(msg->conn->pcb.tcp, msg->msg.lb.backlog); #else /* TCP_LISTEN_BACKLOG */ struct tcp_pcb* 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; } } } } } } 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 do_send(struct api_msg_msg *msg) { 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) { 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)) { 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(&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 do_recv(struct api_msg_msg *msg) { msg->err = ERR_OK; if (msg->conn->pcb.tcp != NULL) { if (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 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 * @return ERR_OK * ERR_MEM if LWIP_TCPIP_CORE_LOCKING=1 and sending hasn't yet finished */ static err_t do_writemore(struct netconn *conn) { err_t err = ERR_OK; void *dataptr; u16_t len, available; u8_t write_finished = 0; size_t diff; u8_t dontblock = netconn_is_nonblocking(conn) || (conn->current_msg->msg.w.apiflags & NETCONN_DONTBLOCK); u8_t apiflags = conn->current_msg->msg.w.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); dataptr = (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; #if LWIP_TCPIP_CORE_LOCKING conn->flags |= NETCONN_FLAG_WRITE_DELAYED; #endif 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 LWIP_TCPIP_CORE_LOCKING conn->flags |= NETCONN_FLAG_WRITE_DELAYED; #endif apiflags |= TCP_WRITE_FLAG_MORE; } if (dontblock && (len < conn->current_msg->msg.w.len)) { /* failed to send all data at once -> nonblocking write not possible */ err = ERR_MEM; } if (err == ERR_OK) { LWIP_ASSERT("do_writemore: invalid length!", ((conn->write_offset + len) <= conn->current_msg->msg.w.len)); err = tcp_write(conn->pcb.tcp, dataptr, len, apiflags); } if (dontblock && (err == ERR_MEM)) { /* nonblocking write failed */ write_finished = 1; err = ERR_WOULDBLOCK; /* let poll_tcp check writable space to mark the pcb writable again */ conn->flags |= NETCONN_FLAG_CHECK_WRITESPACE; /* let select mark this pcb as non-writable. */ API_EVENT(conn, NETCONN_EVT_SENDMINUS, len); } else { /* if OK or memory error, check available space */ if (((err == ERR_OK) || (err == ERR_MEM)) && ((tcp_sndbuf(conn->pcb.tcp) <= TCP_SNDLOWAT) || (tcp_sndqueuelen(conn->pcb.tcp) >= TCP_SNDQUEUELOWAT))) { /* 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) { conn->write_offset += len; if (conn->write_offset == conn->current_msg->msg.w.len) { /* everything was written */ write_finished = 1; conn->write_offset = 0; } tcp_output(conn->pcb.tcp); } else if (err == ERR_MEM) { /* 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 */ tcp_output(conn->pcb.tcp); #if LWIP_TCPIP_CORE_LOCKING conn->flags |= NETCONN_FLAG_WRITE_DELAYED; #endif } else { /* On errors != ERR_MEM, we don't try writing any more but return the error to the application thread. */ write_finished = 1; } } if (write_finished) { /* everything was written: set back connection state and back to application task */ conn->current_msg->err = err; conn->current_msg = NULL; conn->state = NETCONN_NONE; #if LWIP_TCPIP_CORE_LOCKING if ((conn->flags & NETCONN_FLAG_WRITE_DELAYED) != 0) #endif { sys_sem_signal(&conn->op_completed); } } #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 do_write(struct api_msg_msg *msg) { if (ERR_IS_FATAL(msg->conn->last_err)) { msg->err = msg->conn->last_err; } else { if (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 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 msg->conn->flags &= ~NETCONN_FLAG_WRITE_DELAYED; if (do_writemore(msg->conn) != ERR_OK) { LWIP_ASSERT("state!", msg->conn->state == NETCONN_WRITE); UNLOCK_TCPIP_CORE(); sys_arch_sem_wait(&msg->conn->op_completed, 0); LOCK_TCPIP_CORE(); LWIP_ASSERT("state!", msg->conn->state == NETCONN_NONE); } #else /* LWIP_TCPIP_CORE_LOCKING */ do_writemore(msg->conn); #endif /* LWIP_TCPIP_CORE_LOCKING */ /* for both cases: if do_writemore was called, don't ACK the APIMSG since 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 do_getaddr(struct api_msg_msg *msg) { if (msg->conn->pcb.ip != NULL) { *(msg->msg.ad.ipaddr) = (msg->msg.ad.local ? msg->conn->pcb.ip->local_ip : 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) { *(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) { *(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 { *(msg->msg.ad.port) = msg->conn->pcb.udp->remote_port; } } break; #endif /* LWIP_UDP */ #if LWIP_TCP case NETCONN_TCP: *(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 a TCP pcb contained in a netconn * Called from netconn_close * * @param msg the api_msg_msg pointing to the connection */ void do_close(struct api_msg_msg *msg) { #if LWIP_TCP /* @todo: abort running write/connect? */ if ((msg->conn->state != NETCONN_NONE) && (msg->conn->state != NETCONN_LISTEN)) { /* this only happens for TCP netconns */ LWIP_ASSERT("msg->conn->type == NETCONN_TCP", msg->conn->type == NETCONN_TCP); msg->err = ERR_INPROGRESS; } else if ((msg->conn->pcb.tcp != NULL) && (msg->conn->type == NETCONN_TCP)) { if ((msg->msg.sd.shut != NETCONN_SHUT_RDWR) && (msg->conn->state == NETCONN_LISTEN)) { /* LISTEN doesn't support half shutdown */ msg->err = ERR_CONN; } 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; do_close_internal(msg->conn); /* for tcp netconns, do_close_internal ACKs the message */ return; } } else #endif /* LWIP_TCP */ { msg->err = ERR_VAL; } sys_sem_signal(&msg->conn->op_completed); } #if LWIP_IGMP /** * Join multicast groups for UDP netconns. * Called from netconn_join_leave_group * * @param msg the api_msg_msg pointing to the connection */ void do_join_leave_group(struct api_msg_msg *msg) { 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 (msg->msg.jl.join_or_leave == NETCONN_JOIN) { msg->err = igmp_joingroup(msg->msg.jl.netif_addr, msg->msg.jl.multiaddr); } else { msg->err = igmp_leavegroup(msg->msg.jl.netif_addr, msg->msg.jl.multiaddr); } #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 */ #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 do_dns_found(const char *name, ip_addr_t *ipaddr, void *arg) { struct dns_api_msg *msg = (struct dns_api_msg*)arg; LWIP_ASSERT("DNS response for wrong host name", strcmp(msg->name, name) == 0); LWIP_UNUSED_ARG(name); if (ipaddr == NULL) { /* timeout or memory error */ *msg->err = ERR_VAL; } else { /* address was resolved */ *msg->err = ERR_OK; *msg->addr = *ipaddr; } /* wake up the application task waiting in netconn_gethostbyname */ sys_sem_signal(msg->sem); } /** * Execute a DNS query * Called from netconn_gethostbyname * * @param arg the dns_api_msg pointing to the query */ void do_gethostbyname(void *arg) { struct dns_api_msg *msg = (struct dns_api_msg*)arg; *msg->err = dns_gethostbyname(msg->name, msg->addr, do_dns_found, msg); if (*msg->err != ERR_INPROGRESS) { /* on error or immediate success, wake up the application * task waiting in netconn_gethostbyname */ sys_sem_signal(msg->sem); } } #endif /* LWIP_DNS */ #endif /* LWIP_NETCONN */