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. */
13 # include <unistd.h> /* close() pipe() read() write() */
14 # include <signal.h> /* close() pipe() read() write() */
15 # include <netinet/in.h> /* sometimes required for #include <arpa/inet.h> */
16 # include <netinet/tcp.h> /* TCP_NODELAY */
17 # include <arpa/inet.h> /* inet_ntoa() */
18 # include <netdb.h> /* getprotobyname() */
19 # include <sys/time.h> /* struct timeval */
20 # include <errno.h> /* errno */
21 # include <sys/wait.h> /* waitpid() */
22 # include <sys/socket.h> /* getpeername() socket() */
24 # include <string.h> /* memset */
28 #include "transport_private.h"
30 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(trp_tcp,transport,"TCP transport");
35 xbt_error_t gras_trp_tcp_socket_client(gras_trp_plugin_t *self,
37 xbt_error_t gras_trp_tcp_socket_server(gras_trp_plugin_t *self,
39 xbt_error_t gras_trp_tcp_socket_accept(gras_socket_t sock,
42 void gras_trp_tcp_socket_close(gras_socket_t sd);
44 xbt_error_t gras_trp_tcp_chunk_send(gras_socket_t sd,
48 xbt_error_t gras_trp_tcp_chunk_recv(gras_socket_t sd,
52 void gras_trp_tcp_exit(gras_trp_plugin_t *plug);
55 static int TcpProtoNumber(void);
57 *** Specific plugin part
63 } gras_trp_tcp_plug_data_t;
66 *** Specific socket part
71 } gras_trp_tcp_sock_data_t;
77 xbt_error_t gras_trp_tcp_setup(gras_trp_plugin_t *plug) {
79 gras_trp_tcp_plug_data_t *data = xbt_new(gras_trp_tcp_plug_data_t,1);
81 FD_ZERO(&(data->msg_socks));
82 FD_ZERO(&(data->raw_socks));
84 plug->socket_client = gras_trp_tcp_socket_client;
85 plug->socket_server = gras_trp_tcp_socket_server;
86 plug->socket_accept = gras_trp_tcp_socket_accept;
87 plug->socket_close = gras_trp_tcp_socket_close;
89 plug->chunk_send = gras_trp_tcp_chunk_send;
90 plug->chunk_recv = gras_trp_tcp_chunk_recv;
92 plug->flush = NULL; /* nothing's cached */
94 plug->data = (void*)data;
95 plug->exit = gras_trp_tcp_exit;
100 void gras_trp_tcp_exit(gras_trp_plugin_t *plug) {
101 DEBUG1("Exit plugin TCP (free %p)", plug->data);
102 xbt_free(plug->data);
105 xbt_error_t gras_trp_tcp_socket_client(gras_trp_plugin_t *self,
108 struct sockaddr_in addr;
110 struct in_addr *haddr;
111 int size = sock->bufSize * 1024;
113 sock->incoming = 1; /* TCP sockets are duplex'ed */
115 sock->sd = socket (AF_INET, SOCK_STREAM, 0);
119 "Failed to create socket: %s",
123 if (setsockopt(sock->sd, SOL_SOCKET, SO_RCVBUF, (char *)&size, sizeof(size)) ||
124 setsockopt(sock->sd, SOL_SOCKET, SO_SNDBUF, (char *)&size, sizeof(size))) {
125 WARN1("setsockopt failed, cannot set buffer size: %s",
129 he = gethostbyname (sock->peer_name);
132 "Failed to lookup hostname %s: %s",
133 sock->peer_name, strerror (errno));
136 haddr = ((struct in_addr *) (he->h_addr_list)[0]);
138 memset(&addr, 0, sizeof(struct sockaddr_in));
139 memcpy (&addr.sin_addr, haddr, sizeof(struct in_addr));
140 addr.sin_family = AF_INET;
141 addr.sin_port = htons (sock->peer_port);
143 if (connect (sock->sd, (struct sockaddr*) &addr, sizeof (addr)) < 0) {
146 "Failed to connect socket to %s:%d (%s)",
147 sock->peer_name, sock->peer_port, strerror (errno));
154 * gras_trp_tcp_socket_server:
156 * Open a socket used to receive messages.
158 xbt_error_t gras_trp_tcp_socket_server(gras_trp_plugin_t *self,
159 /* OUT */ gras_socket_t sock){
160 int size = sock->bufSize * 1024;
162 struct sockaddr_in server;
164 gras_trp_tcp_plug_data_t *tcp=(gras_trp_tcp_plug_data_t*)self->data;
166 sock->outgoing = 1; /* TCP => duplex mode */
168 server.sin_port = htons((u_short)sock->port);
169 server.sin_addr.s_addr = INADDR_ANY;
170 server.sin_family = AF_INET;
171 if((sock->sd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
172 RAISE1(system_error,"Socket allocation failed: %s", strerror(errno));
175 if (setsockopt(sock->sd, SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on))) {
176 RAISE1(system_error,"setsockopt failed, cannot condition the socket: %s",
180 if (setsockopt(sock->sd, SOL_SOCKET, SO_RCVBUF, (char *)&size, sizeof(size)) ||
181 setsockopt(sock->sd, SOL_SOCKET, SO_SNDBUF, (char *)&size, sizeof(size))) {
182 WARN1("setsockopt failed, cannot set buffer size: %s",
186 if (bind(sock->sd, (struct sockaddr *)&server, sizeof(server)) == -1) {
188 RAISE2(system_error,"Cannot bind to port %d: %s",sock->port, strerror(errno));
191 if (listen(sock->sd, 5) < 0) {
193 RAISE2(system_error,"Cannot listen to port %d: %s",sock->port,strerror(errno));
197 FD_SET(sock->sd, &(tcp->raw_socks));
199 FD_SET(sock->sd, &(tcp->msg_socks));
201 DEBUG2("Openned a server socket on port %d (sock %d)",sock->port,sock->sd);
207 gras_trp_tcp_socket_accept(gras_socket_t sock,
208 gras_socket_t *dst) {
211 struct sockaddr_in peer_in;
212 socklen_t peer_in_len = sizeof(peer_in);
218 gras_trp_socket_new(1,&res);
220 sd = accept(sock->sd, (struct sockaddr *)&peer_in, &peer_in_len);
224 gras_socket_close(sock);
226 "Accept failed (%s). Droping server socket.", strerror(tmp_errno));
229 socklen_t s = sizeof(int);
231 if (setsockopt(sd, SOL_SOCKET, SO_KEEPALIVE, (char *)&i, s)
232 || setsockopt(sd, TcpProtoNumber(), TCP_NODELAY, (char *)&i, s)) {
233 RAISE1(system_error,"setsockopt failed, cannot condition the socket: %s",
237 (*dst)->bufSize = sock->bufSize;
238 size = sock->bufSize * 1024;
239 if (setsockopt(sd, SOL_SOCKET, SO_RCVBUF, (char *)&size, sizeof(size))
240 || setsockopt(sd, SOL_SOCKET, SO_SNDBUF, (char *)&size, sizeof(size))) {
241 WARN1("setsockopt failed, cannot set buffer size: %s",
245 res->plugin = sock->plugin;
246 res->incoming = sock->incoming;
247 res->outgoing = sock->outgoing;
251 res->peer_port = peer_in.sin_port;
253 /* FIXME: Lock to protect inet_ntoa */
254 if (((struct sockaddr *)&peer_in)->sa_family != AF_INET) {
255 res->peer_name = (char*)strdup("unknown");
257 struct in_addr addrAsInAddr;
260 addrAsInAddr.s_addr = peer_in.sin_addr.s_addr;
262 tmp = inet_ntoa(addrAsInAddr);
264 res->peer_name = (char*)strdup(tmp);
266 res->peer_name = (char*)strdup("unknown");
270 VERB3("accepted socket %d to %s:%d", sd, res->peer_name,res->peer_port);
278 void gras_trp_tcp_socket_close(gras_socket_t sock){
279 gras_trp_tcp_plug_data_t *tcp;
281 if (!sock) return; /* close only once */
282 tcp=sock->plugin->data;
284 DEBUG1("close tcp connection %d", sock->sd);
286 /* FIXME: no pipe in GRAS so far
287 if(!FD_ISSET(sd, &connectedPipes)) {
288 if(shutdown(sd, 2) < 0) {
291 ReleaseNWSLock(&lock);
293 / * The other side may have beaten us to the reset. * /
294 if ((tmp_errno!=ENOTCONN) && (tmp_errno!=ECONNRESET)) {
295 WARN1("CloseSocket: shutdown error %d\n", tmp_errno);
300 /* forget about the socket */
302 FD_CLR(sock->sd, &(tcp->raw_socks));
304 FD_CLR(sock->sd, &(tcp->msg_socks));
306 /* close the socket */
307 if(close(sock->sd) < 0) {
308 WARN3("error while closing tcp socket %d: %d (%s)\n",
309 sock->sd, errno, strerror(errno));
314 * gras_trp_tcp_chunk_send:
316 * Send data on a TCP socket
319 gras_trp_tcp_chunk_send(gras_socket_t sock,
323 /* TCP sockets are in duplex mode, don't check direction */
324 xbt_assert0(size >= 0, "Cannot send a negative amount of data");
329 status = write(sock->sd, data, (size_t)size);
330 DEBUG3("write(%d, %p, %ld);", sock->sd, data, size);
333 RAISE4(system_error,"write(%d,%p,%ld) failed: %s",
334 sock->sd, data, size,
342 RAISE0(system_error,"file descriptor closed");
349 * gras_trp_tcp_chunk_recv:
351 * Receive data on a TCP socket.
354 gras_trp_tcp_chunk_recv(gras_socket_t sock,
358 /* TCP sockets are in duplex mode, don't check direction */
359 xbt_assert0(sock, "Cannot recv on an NULL socket");
360 xbt_assert0(size >= 0, "Cannot receive a negative amount of data");
365 status = read(sock->sd, data, (size_t)size);
366 DEBUG3("read(%d, %p, %ld);", sock->sd, data, size);
369 RAISE4(system_error,"read(%d,%p,%d) failed: %s",
370 sock->sd, data, (int)size,
378 RAISE0(system_error,"file descriptor closed");
387 * Returns the tcp protocol number from the network protocol data base.
389 * getprotobyname() is not thread safe. We need to lock it.
391 static int TcpProtoNumber(void) {
392 struct protoent *fetchedEntry;
393 static int returnValue = 0;
395 if(returnValue == 0) {
396 fetchedEntry = getprotobyname("tcp");
397 xbt_assert0(fetchedEntry, "getprotobyname(tcp) gave NULL");
398 returnValue = fetchedEntry->p_proto;
404 /* Data exchange over raw sockets. Placing this in there is a kind of crude hack.
405 It means that the only possible raw are TCP where we may want to do UDP for them.
406 But I fail to find a good internal organization for now. We may want to split
407 raw and regular sockets more efficiently.
409 xbt_error_t gras_socket_raw_exchange(gras_socket_t peer,
411 unsigned int timeout,
412 unsigned long int exp_size,
413 unsigned long int msg_size) {
415 int res_last, msg_sofar, exp_sofar;
420 struct timeval timeOut;
422 chunk = xbt_malloc(msg_size);
424 for (exp_sofar=0; exp_sofar < exp_size; exp_sofar += msg_size) {
425 for(msg_sofar=0; msg_sofar < msg_size; msg_sofar += res_last) {
428 res_last = send(peer->sd, chunk, msg_size - msg_sofar, 0);
432 FD_SET(peer->sd,&rd_set);
433 timeOut.tv_sec = timeout;
436 if (0 < select(peer->sd+1,&rd_set,NULL,NULL,&timeOut))
437 res_last = recv(peer->sd, chunk, msg_size-msg_sofar, 0);
441 /* No progress done, bail out */
443 RAISE0(unknown_error,"Not exchanged a single byte, bailing out");