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 op_completed", conn->op_completed != SYS_SEM_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_sem_free(conn->op_completed);
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)
107 /* No ASSERT here because possible to get a (conn == NULL) if we got an accept error */
112 msg.function = do_delconn;
116 conn->pcb.tcp = NULL;
123 * Get the local or remote IP address and port of a netconn.
124 * For RAW netconns, this returns the protocol instead of a port!
126 * @param conn the netconn to query
127 * @param addr a pointer to which to save the IP address
128 * @param port a pointer to which to save the port (or protocol for RAW)
129 * @param local 1 to get the local IP address, 0 to get the remote one
130 * @return ERR_CONN for invalid connections
131 * ERR_OK if the information was retrieved
134 netconn_getaddr(struct netconn *conn, struct ip_addr *addr, u16_t *port, u8_t local)
138 LWIP_ERROR("netconn_getaddr: invalid conn", (conn != NULL), return ERR_ARG;);
139 LWIP_ERROR("netconn_getaddr: invalid addr", (addr != NULL), return ERR_ARG;);
140 LWIP_ERROR("netconn_getaddr: invalid port", (port != NULL), return ERR_ARG;);
142 msg.function = do_getaddr;
144 msg.msg.msg.ad.ipaddr = addr;
145 msg.msg.msg.ad.port = port;
146 msg.msg.msg.ad.local = local;
153 * Bind a netconn to a specific local IP address and port.
154 * Binding one netconn twice might not always be checked correctly!
156 * @param conn the netconn to bind
157 * @param addr the local IP address to bind the netconn to (use IP_ADDR_ANY
158 * to bind to all addresses)
159 * @param port the local port to bind the netconn to (not used for RAW)
160 * @return ERR_OK if bound, any other err_t on failure
163 netconn_bind(struct netconn *conn, struct ip_addr *addr, u16_t port)
167 LWIP_ERROR("netconn_bind: invalid conn", (conn != NULL), return ERR_ARG;);
169 msg.function = do_bind;
171 msg.msg.msg.bc.ipaddr = addr;
172 msg.msg.msg.bc.port = port;
178 * Connect a netconn to a specific remote IP address and port.
180 * @param conn the netconn to connect
181 * @param addr the remote IP address to connect to
182 * @param port the remote port to connect to (no used for RAW)
183 * @return ERR_OK if connected, return value of tcp_/udp_/raw_connect otherwise
186 netconn_connect(struct netconn *conn, struct ip_addr *addr, u16_t port)
190 LWIP_ERROR("netconn_connect: invalid conn", (conn != NULL), return ERR_ARG;);
192 msg.function = do_connect;
194 msg.msg.msg.bc.ipaddr = addr;
195 msg.msg.msg.bc.port = port;
196 /* This is the only function which need to not block tcpip_thread */
202 * Disconnect a netconn from its current peer (only valid for UDP netconns).
204 * @param conn the netconn to disconnect
205 * @return TODO: return value is not set here...
208 netconn_disconnect(struct netconn *conn)
212 LWIP_ERROR("netconn_disconnect: invalid conn", (conn != NULL), return ERR_ARG;);
214 msg.function = do_disconnect;
221 * Set a TCP netconn into listen mode
223 * @param conn the tcp netconn to set to listen mode
224 * @param backlog the listen backlog, only used if TCP_LISTEN_BACKLOG==1
225 * @return ERR_OK if the netconn was set to listen (UDP and RAW netconns
226 * don't return any error (yet?))
229 netconn_listen_with_backlog(struct netconn *conn, u8_t backlog)
233 /* This does no harm. If TCP_LISTEN_BACKLOG is off, backlog is unused. */
234 LWIP_UNUSED_ARG(backlog);
236 LWIP_ERROR("netconn_listen: invalid conn", (conn != NULL), return ERR_ARG;);
238 msg.function = do_listen;
240 #if TCP_LISTEN_BACKLOG
241 msg.msg.msg.lb.backlog = backlog;
242 #endif /* TCP_LISTEN_BACKLOG */
248 * Accept a new connection on a TCP listening netconn.
250 * @param conn the TCP listen netconn
251 * @return the newly accepted netconn or NULL on timeout
254 netconn_accept(struct netconn *conn)
256 struct netconn *newconn;
258 LWIP_ERROR("netconn_accept: invalid conn", (conn != NULL), return NULL;);
259 LWIP_ERROR("netconn_accept: invalid acceptmbox", (conn->acceptmbox != SYS_MBOX_NULL), return NULL;);
262 if (sys_arch_mbox_fetch(conn->acceptmbox, (void *)&newconn, conn->recv_timeout) == SYS_ARCH_TIMEOUT) {
266 sys_arch_mbox_fetch(conn->acceptmbox, (void *)&newconn, 0);
267 #endif /* LWIP_SO_RCVTIMEO*/
269 /* Register event with callback */
270 API_EVENT(conn, NETCONN_EVT_RCVMINUS, 0);
272 #if TCP_LISTEN_BACKLOG
273 if (newconn != NULL) {
274 /* Let the stack know that we have accepted the connection. */
276 msg.function = do_recv;
280 #endif /* TCP_LISTEN_BACKLOG */
287 * Receive data (in form of a netbuf containing a packet buffer) from a netconn
289 * @param conn the netconn from which to receive data
290 * @return a new netbuf containing received data or NULL on memory error or timeout
293 netconn_recv(struct netconn *conn)
296 struct netbuf *buf = NULL;
300 LWIP_ERROR("netconn_recv: invalid conn", (conn != NULL), return NULL;);
302 if (conn->recvmbox == SYS_MBOX_NULL) {
303 /* @todo: should calling netconn_recv on a TCP listen conn be fatal (ERR_CONN)?? */
304 /* TCP listen conns don't have a recvmbox! */
305 conn->err = ERR_CONN;
309 if (ERR_IS_FATAL(conn->err)) {
313 if (conn->type == NETCONN_TCP) {
315 if (conn->state == NETCONN_LISTEN) {
316 /* @todo: should calling netconn_recv on a TCP listen conn be fatal?? */
317 conn->err = ERR_CONN;
321 buf = memp_malloc(MEMP_NETBUF);
329 if (sys_arch_mbox_fetch(conn->recvmbox, (void *)&p, conn->recv_timeout)==SYS_ARCH_TIMEOUT) {
330 memp_free(MEMP_NETBUF, buf);
331 conn->err = ERR_TIMEOUT;
335 sys_arch_mbox_fetch(conn->recvmbox, (void *)&p, 0);
336 #endif /* LWIP_SO_RCVTIMEO*/
340 SYS_ARCH_DEC(conn->recv_avail, len);
345 /* Register event with callback */
346 API_EVENT(conn, NETCONN_EVT_RCVMINUS, len);
348 /* If we are closed, we indicate that we no longer wish to use the socket */
350 memp_free(MEMP_NETBUF, buf);
351 /* Avoid to lose any previous error code */
352 if (conn->err == ERR_OK) {
353 conn->err = ERR_CLSD;
363 /* Let the stack know that we have taken the data. */
364 msg.function = do_recv;
367 msg.msg.msg.r.len = buf->p->tot_len;
369 msg.msg.msg.r.len = 1;
372 #endif /* LWIP_TCP */
374 #if (LWIP_UDP || LWIP_RAW)
376 if (sys_arch_mbox_fetch(conn->recvmbox, (void *)&buf, conn->recv_timeout)==SYS_ARCH_TIMEOUT) {
380 sys_arch_mbox_fetch(conn->recvmbox, (void *)&buf, 0);
381 #endif /* LWIP_SO_RCVTIMEO*/
383 SYS_ARCH_DEC(conn->recv_avail, buf->p->tot_len);
384 /* Register event with callback */
385 API_EVENT(conn, NETCONN_EVT_RCVMINUS, buf->p->tot_len);
387 #endif /* (LWIP_UDP || LWIP_RAW) */
390 LWIP_DEBUGF(API_LIB_DEBUG, ("netconn_recv: received %p (err %d)\n", (void *)buf, conn->err));
396 * Send data (in form of a netbuf) to a specific remote IP address and port.
397 * Only to be used for UDP and RAW netconns (not TCP).
399 * @param conn the netconn over which to send data
400 * @param buf a netbuf containing the data to send
401 * @param addr the remote IP address to which to send the data
402 * @param port the remote port to which to send the data
403 * @return ERR_OK if data was sent, any other err_t on error
406 netconn_sendto(struct netconn *conn, struct netbuf *buf, struct ip_addr *addr, u16_t port)
411 return netconn_send(conn, buf);
417 * Send data over a UDP or RAW netconn (that is already connected).
419 * @param conn the UDP or RAW netconn over which to send data
420 * @param buf a netbuf containing the data to send
421 * @return ERR_OK if data was sent, any other err_t on error
424 netconn_send(struct netconn *conn, struct netbuf *buf)
428 LWIP_ERROR("netconn_send: invalid conn", (conn != NULL), return ERR_ARG;);
430 LWIP_DEBUGF(API_LIB_DEBUG, ("netconn_send: sending %"U16_F" bytes\n", buf->p->tot_len));
431 msg.function = do_send;
439 * Send data over a TCP netconn.
441 * @param conn the TCP netconn over which to send data
442 * @param dataptr pointer to the application buffer that contains the data to send
443 * @param size size of the application data to send
444 * @param apiflags combination of following flags :
445 * - NETCONN_COPY (0x01) data will be copied into memory belonging to the stack
446 * - NETCONN_MORE (0x02) for TCP connection, PSH flag will be set on last segment sent
447 * @return ERR_OK if data was sent, any other err_t on error
450 netconn_write(struct netconn *conn, const void *dataptr, size_t size, u8_t apiflags)
454 LWIP_ERROR("netconn_write: invalid conn", (conn != NULL), return ERR_ARG;);
455 LWIP_ERROR("netconn_write: invalid conn->type", (conn->type == NETCONN_TCP), return ERR_VAL;);
457 msg.function = do_write;
459 msg.msg.msg.w.dataptr = dataptr;
460 msg.msg.msg.w.apiflags = apiflags;
461 msg.msg.msg.w.len = size;
462 /* For locking the core: this _can_ be delayed on low memory/low send buffer,
463 but if it is, this is done inside api_msg.c:do_write(), so we can use the
464 non-blocking version here. */
470 * Close a TCP netconn (doesn't delete it).
472 * @param conn the TCP netconn to close
473 * @return ERR_OK if the netconn was closed, any other err_t on error
476 netconn_close(struct netconn *conn)
480 LWIP_ERROR("netconn_close: invalid conn", (conn != NULL), return ERR_ARG;);
482 msg.function = do_close;
490 * Join multicast groups for UDP netconns.
492 * @param conn the UDP netconn for which to change multicast addresses
493 * @param multiaddr IP address of the multicast group to join or leave
494 * @param interface the IP address of the network interface on which to send
496 * @param join_or_leave flag whether to send a join- or leave-message
497 * @return ERR_OK if the action was taken, any err_t on error
500 netconn_join_leave_group(struct netconn *conn,
501 struct ip_addr *multiaddr,
502 struct ip_addr *interface,
503 enum netconn_igmp join_or_leave)
507 LWIP_ERROR("netconn_join_leave_group: invalid conn", (conn != NULL), return ERR_ARG;);
509 msg.function = do_join_leave_group;
511 msg.msg.msg.jl.multiaddr = multiaddr;
512 msg.msg.msg.jl.interface = interface;
513 msg.msg.msg.jl.join_or_leave = join_or_leave;
517 #endif /* LWIP_IGMP */
521 * Execute a DNS query, only one IP address is returned
523 * @param name a string representation of the DNS host name to query
524 * @param addr a preallocated struct ip_addr where to store the resolved IP address
525 * @return ERR_OK: resolving succeeded
526 * ERR_MEM: memory error, try again later
527 * ERR_ARG: dns client not initialized or invalid hostname
528 * ERR_VAL: dns server response was invalid
531 netconn_gethostbyname(const char *name, struct ip_addr *addr)
533 struct dns_api_msg msg;
537 LWIP_ERROR("netconn_gethostbyname: invalid name", (name != NULL), return ERR_ARG;);
538 LWIP_ERROR("netconn_gethostbyname: invalid addr", (addr != NULL), return ERR_ARG;);
540 sem = sys_sem_new(0);
541 if (sem == SYS_SEM_NULL) {
550 tcpip_callback(do_gethostbyname, &msg);
558 #endif /* LWIP_NETCONN */