3 /* tcp trp (transport) - send/receive a bunch of bytes from a tcp socket */
5 /* Authors: Martin Quinson */
6 /* Copyright (C) 2004 Martin Quinson. */
8 /* This program is free software; you can redistribute it and/or modify it
9 under the terms of the license (GNU LGPL) which comes with this package. */
11 #include <unistd.h> /* close() pipe() read() write() */
12 #include <signal.h> /* close() pipe() read() write() */
13 #include <netinet/in.h> /* sometimes required for #include <arpa/inet.h> */
14 #include <netinet/tcp.h> /* TCP_NODELAY */
15 #include <arpa/inet.h> /* inet_ntoa() */
16 #include <netdb.h> /* getprotobyname() */
17 #include <sys/time.h> /* struct timeval */
18 #include <errno.h> /* errno */
19 #include <sys/wait.h> /* waitpid() */
20 #include <sys/socket.h> /* getpeername() socket() */
22 #include <string.h> /* memset */
24 #include "gras_private.h"
25 #include "transport_private.h"
27 GRAS_LOG_NEW_DEFAULT_SUBCATEGORY(trp_tcp,transport,"TCP transport");
32 gras_error_t gras_trp_tcp_socket_client(gras_trp_plugin_t *self,
33 /* OUT */ gras_socket_t *sock);
34 gras_error_t gras_trp_tcp_socket_server(gras_trp_plugin_t *self,
35 /* OUT */ gras_socket_t *sock);
36 gras_error_t gras_trp_tcp_socket_accept(gras_socket_t *sock,
39 void gras_trp_tcp_socket_close(gras_socket_t *sd);
41 gras_error_t gras_trp_tcp_chunk_send(gras_socket_t *sd,
45 gras_error_t gras_trp_tcp_chunk_recv(gras_socket_t *sd,
49 void gras_trp_tcp_exit(gras_trp_plugin_t *plug);
52 static int TcpProtoNumber(void);
54 *** Specific plugin part
60 } gras_trp_tcp_plug_data_t;
63 *** Specific socket part
68 } gras_trp_tcp_sock_data_t;
74 gras_error_t gras_trp_tcp_setup(gras_trp_plugin_t *plug) {
76 gras_trp_tcp_plug_data_t *data = gras_new(gras_trp_tcp_plug_data_t,1);
78 FD_ZERO(&(data->msg_socks));
79 FD_ZERO(&(data->raw_socks));
81 plug->socket_client = gras_trp_tcp_socket_client;
82 plug->socket_server = gras_trp_tcp_socket_server;
83 plug->socket_accept = gras_trp_tcp_socket_accept;
84 plug->socket_close = gras_trp_tcp_socket_close;
86 plug->chunk_send = gras_trp_tcp_chunk_send;
87 plug->chunk_recv = gras_trp_tcp_chunk_recv;
89 plug->flush = NULL; /* nothing's cached */
91 plug->data = (void*)data;
92 plug->exit = gras_trp_tcp_exit;
97 void gras_trp_tcp_exit(gras_trp_plugin_t *plug) {
98 DEBUG1("Exit plugin TCP (free %p)", plug->data);
102 gras_error_t gras_trp_tcp_socket_client(gras_trp_plugin_t *self,
103 /* OUT */ gras_socket_t *sock){
105 struct sockaddr_in addr;
107 struct in_addr *haddr;
108 int size = sock->bufSize * 1024;
110 sock->incoming = 1; /* TCP sockets are duplex'ed */
112 sock->sd = socket (AF_INET, SOCK_STREAM, 0);
116 "Failed to create socket: %s",
120 if (setsockopt(sock->sd, SOL_SOCKET, SO_RCVBUF, (char *)&size, sizeof(size)) ||
121 setsockopt(sock->sd, SOL_SOCKET, SO_SNDBUF, (char *)&size, sizeof(size))) {
122 WARN1("setsockopt failed, cannot set buffer size: %s",
126 he = gethostbyname (sock->peer_name);
129 "Failed to lookup hostname %s: %s",
130 sock->peer_name, strerror (errno));
133 haddr = ((struct in_addr *) (he->h_addr_list)[0]);
135 memset(&addr, 0, sizeof(struct sockaddr_in));
136 memcpy (&addr.sin_addr, haddr, sizeof(struct in_addr));
137 addr.sin_family = AF_INET;
138 addr.sin_port = htons (sock->peer_port);
140 if (connect (sock->sd, (struct sockaddr*) &addr, sizeof (addr)) < 0) {
143 "Failed to connect socket to %s:%d (%s)",
144 sock->peer_name, sock->peer_port, strerror (errno));
151 * gras_trp_tcp_socket_server:
153 * Open a socket used to receive messages.
155 gras_error_t gras_trp_tcp_socket_server(gras_trp_plugin_t *self,
156 /* OUT */ gras_socket_t *sock){
157 int size = sock->bufSize * 1024;
159 struct sockaddr_in server;
161 gras_trp_tcp_plug_data_t *tcp=(gras_trp_tcp_plug_data_t*)self->data;
163 sock->outgoing = 1; /* TCP => duplex mode */
165 server.sin_port = htons((u_short)sock->port);
166 server.sin_addr.s_addr = INADDR_ANY;
167 server.sin_family = AF_INET;
168 if((sock->sd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
169 RAISE1(system_error,"Socket allocation failed: %s", strerror(errno));
172 if (setsockopt(sock->sd, SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on))) {
173 RAISE1(system_error,"setsockopt failed, cannot condition the socket: %s",
177 if (setsockopt(sock->sd, SOL_SOCKET, SO_RCVBUF, (char *)&size, sizeof(size)) ||
178 setsockopt(sock->sd, SOL_SOCKET, SO_SNDBUF, (char *)&size, sizeof(size))) {
179 WARN1("setsockopt failed, cannot set buffer size: %s",
183 if (bind(sock->sd, (struct sockaddr *)&server, sizeof(server)) == -1) {
185 RAISE2(system_error,"Cannot bind to port %d: %s",sock->port, strerror(errno));
188 if (listen(sock->sd, 5) < 0) {
190 RAISE2(system_error,"Cannot listen to port %d: %s",sock->port,strerror(errno));
194 FD_SET(sock->sd, &(tcp->raw_socks));
196 FD_SET(sock->sd, &(tcp->msg_socks));
198 DEBUG2("Openned a server socket on port %d (sock %d)",sock->port,sock->sd);
204 gras_trp_tcp_socket_accept(gras_socket_t *sock,
205 gras_socket_t **dst) {
207 gras_error_t errcode;
209 struct sockaddr_in peer_in;
210 socklen_t peer_in_len = sizeof(peer_in);
216 gras_trp_socket_new(1,&res);
218 sd = accept(sock->sd, (struct sockaddr *)&peer_in, &peer_in_len);
222 gras_socket_close(sock);
224 "Accept failed (%s). Droping server socket.", strerror(tmp_errno));
227 socklen_t s = sizeof(int);
229 if (setsockopt(sd, SOL_SOCKET, SO_KEEPALIVE, (char *)&i, s)
230 || setsockopt(sd, TcpProtoNumber(), TCP_NODELAY, (char *)&i, s)) {
231 RAISE1(system_error,"setsockopt failed, cannot condition the socket: %s",
235 (*dst)->bufSize = sock->bufSize;
236 size = sock->bufSize * 1024;
237 if (setsockopt(sd, SOL_SOCKET, SO_RCVBUF, (char *)&size, sizeof(size))
238 || setsockopt(sd, SOL_SOCKET, SO_SNDBUF, (char *)&size, sizeof(size))) {
239 WARN1("setsockopt failed, cannot set buffer size: %s",
243 res->plugin = sock->plugin;
244 res->incoming = sock->incoming;
245 res->outgoing = sock->outgoing;
249 res->peer_port = peer_in.sin_port;
251 /* FIXME: Lock to protect inet_ntoa */
252 if (((struct sockaddr *)&peer_in)->sa_family != AF_INET) {
253 res->peer_name = (char*)strdup("unknown");
255 struct in_addr addrAsInAddr;
258 addrAsInAddr.s_addr = peer_in.sin_addr.s_addr;
260 tmp = inet_ntoa(addrAsInAddr);
262 res->peer_name = (char*)strdup(tmp);
264 res->peer_name = (char*)strdup("unknown");
268 VERB3("accepted socket %d to %s:%d", sd, res->peer_name,res->peer_port);
276 void gras_trp_tcp_socket_close(gras_socket_t *sock){
277 gras_trp_tcp_plug_data_t *tcp;
279 if (!sock) return; /* close only once */
280 tcp=sock->plugin->data;
282 DEBUG1("close tcp connection %d", sock->sd);
284 /* FIXME: no pipe in GRAS so far
285 if(!FD_ISSET(sd, &connectedPipes)) {
286 if(shutdown(sd, 2) < 0) {
289 ReleaseNWSLock(&lock);
291 / * The other side may have beaten us to the reset. * /
292 if ((tmp_errno!=ENOTCONN) && (tmp_errno!=ECONNRESET)) {
293 WARN1("CloseSocket: shutdown error %d\n", tmp_errno);
298 /* forget about the socket */
300 FD_CLR(sock->sd, &(tcp->raw_socks));
302 FD_CLR(sock->sd, &(tcp->msg_socks));
304 /* close the socket */
305 if(close(sock->sd) < 0) {
306 WARN3("error while closing tcp socket %d: %d (%s)\n",
307 sock->sd, errno, strerror(errno));
312 * gras_trp_tcp_chunk_send:
314 * Send data on a TCP socket
317 gras_trp_tcp_chunk_send(gras_socket_t *sock,
321 /* TCP sockets are in duplex mode, don't check direction */
322 gras_assert0(size >= 0, "Cannot send a negative amount of data");
327 status = write(sock->sd, data, (size_t)size);
328 DEBUG3("write(%d, %p, %ld);", sock->sd, data, size);
331 RAISE4(system_error,"write(%d,%p,%ld) failed: %s",
332 sock->sd, data, size,
340 RAISE0(system_error,"file descriptor closed");
347 * gras_trp_tcp_chunk_recv:
349 * Receive data on a TCP socket.
352 gras_trp_tcp_chunk_recv(gras_socket_t *sock,
356 /* TCP sockets are in duplex mode, don't check direction */
357 gras_assert0(sock, "Cannot recv on an NULL socket");
358 gras_assert0(size >= 0, "Cannot receive a negative amount of data");
363 status = read(sock->sd, data, (size_t)size);
364 DEBUG3("read(%d, %p, %ld);", sock->sd, data, size);
367 RAISE4(system_error,"read(%d,%p,%d) failed: %s",
368 sock->sd, data, (int)size,
376 RAISE0(system_error,"file descriptor closed");
385 * Returns the tcp protocol number from the network protocol data base.
387 * getprotobyname() is not thread safe. We need to lock it.
389 static int TcpProtoNumber(void) {
390 struct protoent *fetchedEntry;
391 static int returnValue = 0;
393 if(returnValue == 0) {
394 fetchedEntry = getprotobyname("tcp");
395 gras_assert0(fetchedEntry, "getprotobyname(tcp) gave NULL");
396 returnValue = fetchedEntry->p_proto;
402 /* Data exchange over raw sockets. Placing this in there is a kind of crude hack.
403 It means that the only possible raw are TCP where we may want to do UDP for them.
404 But I fail to find a good internal organization for now. We may want to split
405 raw and regular sockets more efficiently.
407 gras_error_t gras_socket_raw_exchange(gras_socket_t *peer,
409 unsigned int timeout,
410 unsigned long int exp_size,
411 unsigned long int msg_size) {
413 int res_last, msg_sofar, exp_sofar;
418 struct timeval timeOut;
420 chunk = gras_malloc(msg_size);
422 for (exp_sofar=0; exp_sofar < exp_size; exp_size += msg_sofar) {
423 for(msg_sofar=0; msg_sofar < msg_size; msg_size += res_last) {
426 res_last = send(peer->sd, chunk, msg_size - msg_sofar, 0);
430 FD_SET(peer->sd,&rd_set);
431 timeOut.tv_sec = timeout;
434 if (0 < select(peer->sd+1,&rd_set,NULL,NULL,&timeOut))
435 res_last = recv(peer->sd, chunk, msg_size-msg_sofar, 0);
439 /* No progress done, bail out */
441 RAISE0(unknown_error,"Not exchanged a single byte, bailing out");