3 * Sequential API External module
8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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12 * are permitted provided that the following conditions are met:
14 * 1. Redistributions of source code must retain the above copyright notice,
15 * this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright notice,
17 * this list of conditions and the following disclaimer in the documentation
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22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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33 * This file is part of the lwIP TCP/IP stack.
35 * Author: Adam Dunkels <adam@sics.se>
39 /* This is the part of the API that is linked with
44 #if LWIP_NETCONN /* don't build if not configured for use in lwipopts.h */
47 #include "lwip/tcpip.h"
48 #include "lwip/memp.h"
58 * Create a new netconn (of a specific type) that has a callback function.
59 * The corresponding pcb is also created.
61 * @param t the type of 'connection' to create (@see enum netconn_type)
62 * @param proto the IP protocol for RAW IP pcbs
63 * @param callback a function to call on status changes (RX available, TX'ed)
64 * @return a newly allocated struct netconn or
65 * NULL on memory error
68 netconn_new_with_proto_and_callback(enum netconn_type t, u8_t proto, netconn_callback callback)
73 conn = netconn_alloc(t, callback);
75 msg.function = do_newconn;
76 msg.msg.msg.n.proto = proto;
80 if (conn->err != ERR_OK) {
81 LWIP_ASSERT("freeing conn without freeing pcb", conn->pcb.tcp == NULL);
82 LWIP_ASSERT("conn has no mbox", conn->mbox != SYS_MBOX_NULL);
83 LWIP_ASSERT("conn has no recvmbox", conn->recvmbox != SYS_MBOX_NULL);
84 LWIP_ASSERT("conn->acceptmbox shouldn't exist", conn->acceptmbox == SYS_MBOX_NULL);
85 sys_mbox_free(conn->mbox);
86 sys_mbox_free(conn->recvmbox);
87 memp_free(MEMP_NETCONN, conn);
95 * Close a netconn 'connection' and free its resources.
96 * UDP and RAW connection are completely closed, TCP pcbs might still be in a waitstate
99 * @param conn the netconn to delete
100 * @return ERR_OK if the connection was deleted
103 netconn_delete(struct netconn *conn)
108 /* No ASSERT here because possible to get a (conn == NULL) if we got an accept error */
113 msg.function = do_delconn;
117 /* Drain the recvmbox. */
118 if (conn->recvmbox != SYS_MBOX_NULL) {
119 while (sys_mbox_tryfetch(conn->recvmbox, &mem) != SYS_MBOX_EMPTY) {
120 if (conn->type == NETCONN_TCP) {
122 pbuf_free((struct pbuf *)mem);
125 netbuf_delete((struct netbuf *)mem);
128 sys_mbox_free(conn->recvmbox);
129 conn->recvmbox = SYS_MBOX_NULL;
132 /* Drain the acceptmbox. */
133 if (conn->acceptmbox != SYS_MBOX_NULL) {
134 while (sys_mbox_tryfetch(conn->acceptmbox, &mem) != SYS_MBOX_EMPTY) {
135 netconn_delete((struct netconn *)mem);
137 sys_mbox_free(conn->acceptmbox);
138 conn->acceptmbox = SYS_MBOX_NULL;
141 sys_mbox_free(conn->mbox);
142 conn->mbox = SYS_MBOX_NULL;
144 memp_free(MEMP_NETCONN, conn);
149 * Get the type of a netconn (as enum netconn_type).
151 * @param conn the netconn of which to get the type
152 * @return the netconn_type of conn
155 netconn_type(struct netconn *conn)
157 LWIP_ERROR("netconn_type: invalid conn", (conn != NULL), return NETCONN_INVALID;);
162 * Get the local or remote IP address and port of a netconn.
163 * For RAW netconns, this returns the protocol instead of a port!
165 * @param conn the netconn to query
166 * @param addr a pointer to which to save the IP address
167 * @param port a pointer to which to save the port (or protocol for RAW)
168 * @param local 1 to get the local IP address, 0 to get the remote one
169 * @return ERR_CONN for invalid connections
170 * ERR_OK if the information was retrieved
173 netconn_getaddr(struct netconn *conn, struct ip_addr *addr, u16_t *port, u8_t local)
177 LWIP_ERROR("netconn_getaddr: invalid conn", (conn != NULL), return ERR_ARG;);
178 LWIP_ERROR("netconn_getaddr: invalid addr", (addr != NULL), return ERR_ARG;);
179 LWIP_ERROR("netconn_getaddr: invalid port", (port != NULL), return ERR_ARG;);
181 msg.function = do_getaddr;
183 msg.msg.msg.ad.ipaddr = addr;
184 msg.msg.msg.ad.port = port;
185 msg.msg.msg.ad.local = local;
192 * Bind a netconn to a specific local IP address and port.
193 * Binding one netconn twice might not always be checked correctly!
195 * @param conn the netconn to bind
196 * @param addr the local IP address to bind the netconn to (use IP_ADDR_ANY
197 * to bind to all addresses)
198 * @param port the local port to bind the netconn to (not used for RAW)
199 * @return ERR_OK if bound, any other err_t on failure
202 netconn_bind(struct netconn *conn, struct ip_addr *addr, u16_t port)
206 LWIP_ERROR("netconn_bind: invalid conn", (conn != NULL), return ERR_ARG;);
208 msg.function = do_bind;
210 msg.msg.msg.bc.ipaddr = addr;
211 msg.msg.msg.bc.port = port;
217 * Connect a netconn to a specific remote IP address and port.
219 * @param conn the netconn to connect
220 * @param addr the remote IP address to connect to
221 * @param port the remote port to connect to (no used for RAW)
222 * @return ERR_OK if connected, return value of tcp_/udp_/raw_connect otherwise
225 netconn_connect(struct netconn *conn, struct ip_addr *addr, u16_t port)
229 LWIP_ERROR("netconn_connect: invalid conn", (conn != NULL), return ERR_ARG;);
231 msg.function = do_connect;
233 msg.msg.msg.bc.ipaddr = addr;
234 msg.msg.msg.bc.port = port;
235 /* This is the only function which need to not block tcpip_thread */
241 * Disconnect a netconn from its current peer (only valid for UDP netconns).
243 * @param conn the netconn to disconnect
244 * @return TODO: return value is not set here...
247 netconn_disconnect(struct netconn *conn)
251 LWIP_ERROR("netconn_disconnect: invalid conn", (conn != NULL), return ERR_ARG;);
253 msg.function = do_disconnect;
260 * Set a TCP netconn into listen mode
262 * @param conn the tcp netconn to set to listen mode
263 * @param backlog the listen backlog, only used if TCP_LISTEN_BACKLOG==1
264 * @return ERR_OK if the netconn was set to listen (UDP and RAW netconns
265 * don't return any error (yet?))
268 netconn_listen_with_backlog(struct netconn *conn, u8_t backlog)
272 /* This does no harm. If TCP_LISTEN_BACKLOG is off, backlog is unused. */
273 LWIP_UNUSED_ARG(backlog);
275 LWIP_ERROR("netconn_listen: invalid conn", (conn != NULL), return ERR_ARG;);
277 msg.function = do_listen;
279 #if TCP_LISTEN_BACKLOG
280 msg.msg.msg.lb.backlog = backlog;
281 #endif /* TCP_LISTEN_BACKLOG */
287 * Accept a new connection on a TCP listening netconn.
289 * @param conn the TCP listen netconn
290 * @return the newly accepted netconn or NULL on timeout
293 netconn_accept(struct netconn *conn)
295 struct netconn *newconn;
297 LWIP_ERROR("netconn_accept: invalid conn", (conn != NULL), return NULL;);
298 LWIP_ERROR("netconn_accept: invalid acceptmbox", (conn->acceptmbox != SYS_MBOX_NULL), return NULL;);
301 if (sys_arch_mbox_fetch(conn->acceptmbox, (void *)&newconn, conn->recv_timeout) == SYS_ARCH_TIMEOUT) {
305 sys_arch_mbox_fetch(conn->acceptmbox, (void *)&newconn, 0);
306 #endif /* LWIP_SO_RCVTIMEO*/
308 /* Register event with callback */
309 API_EVENT(conn, NETCONN_EVT_RCVMINUS, 0);
311 #if TCP_LISTEN_BACKLOG
312 if (newconn != NULL) {
313 /* Let the stack know that we have accepted the connection. */
315 msg.function = do_recv;
319 #endif /* TCP_LISTEN_BACKLOG */
326 * Receive data (in form of a netbuf containing a packet buffer) from a netconn
328 * @param conn the netconn from which to receive data
329 * @return a new netbuf containing received data or NULL on memory error or timeout
332 netconn_recv(struct netconn *conn)
335 struct netbuf *buf = NULL;
339 LWIP_ERROR("netconn_recv: invalid conn", (conn != NULL), return NULL;);
341 if (conn->recvmbox == SYS_MBOX_NULL) {
342 /* @todo: should calling netconn_recv on a TCP listen conn be fatal (ERR_CONN)?? */
343 /* TCP listen conns don't have a recvmbox! */
344 conn->err = ERR_CONN;
348 if (ERR_IS_FATAL(conn->err)) {
352 if (conn->type == NETCONN_TCP) {
354 if (conn->state == NETCONN_LISTEN) {
355 /* @todo: should calling netconn_recv on a TCP listen conn be fatal?? */
356 conn->err = ERR_CONN;
360 buf = memp_malloc(MEMP_NETBUF);
368 if (sys_arch_mbox_fetch(conn->recvmbox, (void *)&p, conn->recv_timeout)==SYS_ARCH_TIMEOUT) {
369 conn->err = ERR_TIMEOUT;
373 sys_arch_mbox_fetch(conn->recvmbox, (void *)&p, 0);
374 #endif /* LWIP_SO_RCVTIMEO*/
378 SYS_ARCH_DEC(conn->recv_avail, len);
383 /* Register event with callback */
384 API_EVENT(conn, NETCONN_EVT_RCVMINUS, len);
386 /* If we are closed, we indicate that we no longer wish to use the socket */
388 memp_free(MEMP_NETBUF, buf);
389 /* Avoid to lose any previous error code */
390 if (conn->err == ERR_OK) {
391 conn->err = ERR_CLSD;
401 /* Let the stack know that we have taken the data. */
402 msg.function = do_recv;
405 msg.msg.msg.r.len = buf->p->tot_len;
407 msg.msg.msg.r.len = 1;
410 #endif /* LWIP_TCP */
412 #if (LWIP_UDP || LWIP_RAW)
414 if (sys_arch_mbox_fetch(conn->recvmbox, (void *)&buf, conn->recv_timeout)==SYS_ARCH_TIMEOUT) {
418 sys_arch_mbox_fetch(conn->recvmbox, (void *)&buf, 0);
419 #endif /* LWIP_SO_RCVTIMEO*/
421 SYS_ARCH_DEC(conn->recv_avail, buf->p->tot_len);
422 /* Register event with callback */
423 API_EVENT(conn, NETCONN_EVT_RCVMINUS, buf->p->tot_len);
425 #endif /* (LWIP_UDP || LWIP_RAW) */
428 LWIP_DEBUGF(API_LIB_DEBUG, ("netconn_recv: received %p (err %d)\n", (void *)buf, conn->err));
434 * Send data (in form of a netbuf) to a specific remote IP address and port.
435 * Only to be used for UDP and RAW netconns (not TCP).
437 * @param conn the netconn over which to send data
438 * @param buf a netbuf containing the data to send
439 * @param addr the remote IP address to which to send the data
440 * @param port the remote port to which to send the data
441 * @return ERR_OK if data was sent, any other err_t on error
444 netconn_sendto(struct netconn *conn, struct netbuf *buf, struct ip_addr *addr, u16_t port)
449 return netconn_send(conn, buf);
455 * Send data over a UDP or RAW netconn (that is already connected).
457 * @param conn the UDP or RAW netconn over which to send data
458 * @param buf a netbuf containing the data to send
459 * @return ERR_OK if data was sent, any other err_t on error
462 netconn_send(struct netconn *conn, struct netbuf *buf)
466 LWIP_ERROR("netconn_send: invalid conn", (conn != NULL), return ERR_ARG;);
468 LWIP_DEBUGF(API_LIB_DEBUG, ("netconn_send: sending %d bytes\n", buf->p->tot_len));
469 msg.function = do_send;
477 * Send data over a TCP netconn.
479 * @param conn the TCP netconn over which to send data
480 * @param dataptr pointer to the application buffer that contains the data to send
481 * @param size size of the application data to send
482 * @param apiflags combination of following flags :
483 * - NETCONN_COPY (0x01) data will be copied into memory belonging to the stack
484 * - NETCONN_MORE (0x02) for TCP connection, PSH flag will be set on last segment sent
485 * @return ERR_OK if data was sent, any other err_t on error
488 netconn_write(struct netconn *conn, const void *dataptr, int size, u8_t apiflags)
492 LWIP_ERROR("netconn_write: invalid conn", (conn != NULL), return ERR_ARG;);
493 LWIP_ERROR("netconn_write: invalid conn->type", (conn->type == NETCONN_TCP), return ERR_VAL;);
495 msg.function = do_write;
497 msg.msg.msg.w.dataptr = dataptr;
498 msg.msg.msg.w.apiflags = apiflags;
499 msg.msg.msg.w.len = size;
500 /* For locking the core: this _can_ be delayed on low memory/low send buffer,
501 but if it is, this is done inside api_msg.c:do_write(), so we can use the
502 non-blocking version here. */
508 * Close a TCP netconn (doesn't delete it).
510 * @param conn the TCP netconn to close
511 * @return ERR_OK if the netconn was closed, any other err_t on error
514 netconn_close(struct netconn *conn)
518 LWIP_ERROR("netconn_close: invalid conn", (conn != NULL), return ERR_ARG;);
520 msg.function = do_close;
528 * Join multicast groups for UDP netconns.
530 * @param conn the UDP netconn for which to change multicast addresses
531 * @param multiaddr IP address of the multicast group to join or leave
532 * @param interface the IP address of the network interface on which to send
534 * @param join_or_leave flag whether to send a join- or leave-message
535 * @return ERR_OK if the action was taken, any err_t on error
538 netconn_join_leave_group(struct netconn *conn,
539 struct ip_addr *multiaddr,
540 struct ip_addr *interface,
541 enum netconn_igmp join_or_leave)
545 LWIP_ERROR("netconn_join_leave_group: invalid conn", (conn != NULL), return ERR_ARG;);
547 msg.function = do_join_leave_group;
549 msg.msg.msg.jl.multiaddr = multiaddr;
550 msg.msg.msg.jl.interface = interface;
551 msg.msg.msg.jl.join_or_leave = join_or_leave;
555 #endif /* LWIP_IGMP */
559 * Execute a DNS query, only one IP address is returned
561 * @param name a string representation of the DNS host name to query
562 * @param addr a preallocated struct ip_addr where to store the resolved IP address
563 * @return ERR_OK: resolving succeeded
564 * ERR_MEM: memory error, try again later
565 * ERR_ARG: dns client not initialized or invalid hostname
566 * ERR_VAL: dns server response was invalid
569 netconn_gethostbyname(const char *name, struct ip_addr *addr)
571 struct dns_api_msg msg;
575 LWIP_ERROR("netconn_gethostbyname: invalid name", (name != NULL), return ERR_ARG;);
576 LWIP_ERROR("netconn_gethostbyname: invalid addr", (addr != NULL), return ERR_ARG;);
578 sem = sys_sem_new(0);
579 if (sem == SYS_SEM_NULL) {
588 tcpip_callback(do_gethostbyname, &msg);
596 #endif /* LWIP_NETCONN */