3 /* tcp trp (transport) - send/receive a bunch of bytes from a tcp socket */
5 /* Copyright (c) 2004 Martin Quinson. All rights reserved. */
7 /* This program is free software; you can redistribute it and/or modify it
8 * under the terms of the license (GNU LGPL) which comes with this package. */
10 #include <unistd.h> /* close() pipe() read() write() */
11 #include <signal.h> /* close() pipe() read() write() */
12 #include <netinet/in.h> /* sometimes required for #include <arpa/inet.h> */
13 #include <netinet/tcp.h> /* TCP_NODELAY */
14 #include <arpa/inet.h> /* inet_ntoa() */
15 #include <netdb.h> /* getprotobyname() */
16 #include <sys/time.h> /* struct timeval */
17 #include <errno.h> /* errno */
18 #include <sys/wait.h> /* waitpid() */
19 #include <sys/socket.h> /* getpeername() socket() */
21 #include <string.h> /* memset */
23 #include "transport_private.h"
25 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(trp_tcp,transport,"TCP transport");
30 xbt_error_t gras_trp_tcp_socket_client(gras_trp_plugin_t *self,
32 xbt_error_t gras_trp_tcp_socket_server(gras_trp_plugin_t *self,
34 xbt_error_t gras_trp_tcp_socket_accept(gras_socket_t sock,
37 void gras_trp_tcp_socket_close(gras_socket_t sd);
39 xbt_error_t gras_trp_tcp_chunk_send(gras_socket_t sd,
43 xbt_error_t gras_trp_tcp_chunk_recv(gras_socket_t sd,
47 void gras_trp_tcp_exit(gras_trp_plugin_t *plug);
50 static int TcpProtoNumber(void);
52 *** Specific plugin part
58 } gras_trp_tcp_plug_data_t;
61 *** Specific socket part
66 } gras_trp_tcp_sock_data_t;
72 xbt_error_t gras_trp_tcp_setup(gras_trp_plugin_t *plug) {
74 gras_trp_tcp_plug_data_t *data = xbt_new(gras_trp_tcp_plug_data_t,1);
76 FD_ZERO(&(data->msg_socks));
77 FD_ZERO(&(data->raw_socks));
79 plug->socket_client = gras_trp_tcp_socket_client;
80 plug->socket_server = gras_trp_tcp_socket_server;
81 plug->socket_accept = gras_trp_tcp_socket_accept;
82 plug->socket_close = gras_trp_tcp_socket_close;
84 plug->chunk_send = gras_trp_tcp_chunk_send;
85 plug->chunk_recv = gras_trp_tcp_chunk_recv;
87 plug->flush = NULL; /* nothing's cached */
89 plug->data = (void*)data;
90 plug->exit = gras_trp_tcp_exit;
95 void gras_trp_tcp_exit(gras_trp_plugin_t *plug) {
96 DEBUG1("Exit plugin TCP (free %p)", plug->data);
100 xbt_error_t gras_trp_tcp_socket_client(gras_trp_plugin_t *self,
103 struct sockaddr_in addr;
105 struct in_addr *haddr;
106 int size = sock->bufSize * 1024;
108 sock->incoming = 1; /* TCP sockets are duplex'ed */
110 sock->sd = socket (AF_INET, SOCK_STREAM, 0);
114 "Failed to create socket: %s",
118 if (setsockopt(sock->sd, SOL_SOCKET, SO_RCVBUF, (char *)&size, sizeof(size)) ||
119 setsockopt(sock->sd, SOL_SOCKET, SO_SNDBUF, (char *)&size, sizeof(size))) {
120 WARN1("setsockopt failed, cannot set buffer size: %s",
124 he = gethostbyname (sock->peer_name);
127 "Failed to lookup hostname %s: %s",
128 sock->peer_name, strerror (errno));
131 haddr = ((struct in_addr *) (he->h_addr_list)[0]);
133 memset(&addr, 0, sizeof(struct sockaddr_in));
134 memcpy (&addr.sin_addr, haddr, sizeof(struct in_addr));
135 addr.sin_family = AF_INET;
136 addr.sin_port = htons (sock->peer_port);
138 if (connect (sock->sd, (struct sockaddr*) &addr, sizeof (addr)) < 0) {
141 "Failed to connect socket to %s:%d (%s)",
142 sock->peer_name, sock->peer_port, strerror (errno));
149 * gras_trp_tcp_socket_server:
151 * Open a socket used to receive messages.
153 xbt_error_t gras_trp_tcp_socket_server(gras_trp_plugin_t *self,
154 /* OUT */ gras_socket_t sock){
155 int size = sock->bufSize * 1024;
157 struct sockaddr_in server;
159 gras_trp_tcp_plug_data_t *tcp=(gras_trp_tcp_plug_data_t*)self->data;
161 sock->outgoing = 1; /* TCP => duplex mode */
163 server.sin_port = htons((u_short)sock->port);
164 server.sin_addr.s_addr = INADDR_ANY;
165 server.sin_family = AF_INET;
166 if((sock->sd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
167 RAISE1(system_error,"Socket allocation failed: %s", strerror(errno));
170 if (setsockopt(sock->sd, SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on))) {
171 RAISE1(system_error,"setsockopt failed, cannot condition the socket: %s",
175 if (setsockopt(sock->sd, SOL_SOCKET, SO_RCVBUF, (char *)&size, sizeof(size)) ||
176 setsockopt(sock->sd, SOL_SOCKET, SO_SNDBUF, (char *)&size, sizeof(size))) {
177 WARN1("setsockopt failed, cannot set buffer size: %s",
181 if (bind(sock->sd, (struct sockaddr *)&server, sizeof(server)) == -1) {
183 RAISE2(system_error,"Cannot bind to port %d: %s",sock->port, strerror(errno));
186 if (listen(sock->sd, 5) < 0) {
188 RAISE2(system_error,"Cannot listen to port %d: %s",sock->port,strerror(errno));
192 FD_SET(sock->sd, &(tcp->raw_socks));
194 FD_SET(sock->sd, &(tcp->msg_socks));
196 DEBUG2("Openned a server socket on port %d (sock %d)",sock->port,sock->sd);
202 gras_trp_tcp_socket_accept(gras_socket_t sock,
203 gras_socket_t *dst) {
206 struct sockaddr_in peer_in;
207 socklen_t peer_in_len = sizeof(peer_in);
213 gras_trp_socket_new(1,&res);
215 sd = accept(sock->sd, (struct sockaddr *)&peer_in, &peer_in_len);
219 gras_socket_close(sock);
221 "Accept failed (%s). Droping server socket.", strerror(tmp_errno));
224 socklen_t s = sizeof(int);
226 if (setsockopt(sd, SOL_SOCKET, SO_KEEPALIVE, (char *)&i, s)
227 || setsockopt(sd, TcpProtoNumber(), TCP_NODELAY, (char *)&i, s)) {
228 RAISE1(system_error,"setsockopt failed, cannot condition the socket: %s",
232 (*dst)->bufSize = sock->bufSize;
233 size = sock->bufSize * 1024;
234 if (setsockopt(sd, SOL_SOCKET, SO_RCVBUF, (char *)&size, sizeof(size))
235 || setsockopt(sd, SOL_SOCKET, SO_SNDBUF, (char *)&size, sizeof(size))) {
236 WARN1("setsockopt failed, cannot set buffer size: %s",
240 res->plugin = sock->plugin;
241 res->incoming = sock->incoming;
242 res->outgoing = sock->outgoing;
246 res->peer_port = peer_in.sin_port;
248 /* FIXME: Lock to protect inet_ntoa */
249 if (((struct sockaddr *)&peer_in)->sa_family != AF_INET) {
250 res->peer_name = (char*)strdup("unknown");
252 struct in_addr addrAsInAddr;
255 addrAsInAddr.s_addr = peer_in.sin_addr.s_addr;
257 tmp = inet_ntoa(addrAsInAddr);
259 res->peer_name = (char*)strdup(tmp);
261 res->peer_name = (char*)strdup("unknown");
265 VERB3("accepted socket %d to %s:%d", sd, res->peer_name,res->peer_port);
273 void gras_trp_tcp_socket_close(gras_socket_t sock){
274 gras_trp_tcp_plug_data_t *tcp;
276 if (!sock) return; /* close only once */
277 tcp=sock->plugin->data;
279 DEBUG1("close tcp connection %d", sock->sd);
281 /* FIXME: no pipe in GRAS so far
282 if(!FD_ISSET(sd, &connectedPipes)) {
283 if(shutdown(sd, 2) < 0) {
286 ReleaseNWSLock(&lock);
288 / * The other side may have beaten us to the reset. * /
289 if ((tmp_errno!=ENOTCONN) && (tmp_errno!=ECONNRESET)) {
290 WARN1("CloseSocket: shutdown error %d\n", tmp_errno);
295 /* forget about the socket */
297 FD_CLR(sock->sd, &(tcp->raw_socks));
299 FD_CLR(sock->sd, &(tcp->msg_socks));
301 /* close the socket */
302 if(close(sock->sd) < 0) {
303 WARN3("error while closing tcp socket %d: %d (%s)\n",
304 sock->sd, errno, strerror(errno));
309 * gras_trp_tcp_chunk_send:
311 * Send data on a TCP socket
314 gras_trp_tcp_chunk_send(gras_socket_t sock,
318 /* TCP sockets are in duplex mode, don't check direction */
319 xbt_assert0(size >= 0, "Cannot send a negative amount of data");
324 status = write(sock->sd, data, (size_t)size);
325 DEBUG3("write(%d, %p, %ld);", sock->sd, data, size);
328 RAISE4(system_error,"write(%d,%p,%ld) failed: %s",
329 sock->sd, data, size,
337 RAISE0(system_error,"file descriptor closed");
344 * gras_trp_tcp_chunk_recv:
346 * Receive data on a TCP socket.
349 gras_trp_tcp_chunk_recv(gras_socket_t sock,
353 /* TCP sockets are in duplex mode, don't check direction */
354 xbt_assert0(sock, "Cannot recv on an NULL socket");
355 xbt_assert0(size >= 0, "Cannot receive a negative amount of data");
360 status = read(sock->sd, data, (size_t)size);
361 DEBUG3("read(%d, %p, %ld);", sock->sd, data, size);
364 RAISE4(system_error,"read(%d,%p,%d) failed: %s",
365 sock->sd, data, (int)size,
373 RAISE0(system_error,"file descriptor closed");
382 * Returns the tcp protocol number from the network protocol data base.
384 * getprotobyname() is not thread safe. We need to lock it.
386 static int TcpProtoNumber(void) {
387 struct protoent *fetchedEntry;
388 static int returnValue = 0;
390 if(returnValue == 0) {
391 fetchedEntry = getprotobyname("tcp");
392 xbt_assert0(fetchedEntry, "getprotobyname(tcp) gave NULL");
393 returnValue = fetchedEntry->p_proto;
399 /* Data exchange over raw sockets. Placing this in there is a kind of crude hack.
400 It means that the only possible raw are TCP where we may want to do UDP for them.
401 But I fail to find a good internal organization for now. We may want to split
402 raw and regular sockets more efficiently.
404 xbt_error_t gras_socket_raw_exchange(gras_socket_t peer,
406 unsigned int timeout,
407 unsigned long int exp_size,
408 unsigned long int msg_size) {
410 int res_last, msg_sofar, exp_sofar;
415 struct timeval timeOut;
417 chunk = xbt_malloc(msg_size);
419 for (exp_sofar=0; exp_sofar < exp_size; exp_sofar += msg_size) {
420 for(msg_sofar=0; msg_sofar < msg_size; msg_sofar += res_last) {
423 res_last = send(peer->sd, chunk, msg_size - msg_sofar, 0);
427 FD_SET(peer->sd,&rd_set);
428 timeOut.tv_sec = timeout;
431 if (0 < select(peer->sd+1,&rd_set,NULL,NULL,&timeOut))
432 res_last = recv(peer->sd, chunk, msg_size-msg_sofar, 0);
436 /* No progress done, bail out */
438 RAISE0(unknown_error,"Not exchanged a single byte, bailing out");