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 "transport_private.h"
26 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(trp_tcp,transport,"TCP transport");
31 xbt_error_t gras_trp_tcp_socket_client(gras_trp_plugin_t *self,
33 xbt_error_t gras_trp_tcp_socket_server(gras_trp_plugin_t *self,
35 xbt_error_t gras_trp_tcp_socket_accept(gras_socket_t sock,
38 void gras_trp_tcp_socket_close(gras_socket_t sd);
40 xbt_error_t gras_trp_tcp_chunk_send(gras_socket_t sd,
44 xbt_error_t gras_trp_tcp_chunk_recv(gras_socket_t sd,
48 void gras_trp_tcp_exit(gras_trp_plugin_t *plug);
51 static int TcpProtoNumber(void);
53 *** Specific plugin part
59 } gras_trp_tcp_plug_data_t;
62 *** Specific socket part
67 } gras_trp_tcp_sock_data_t;
73 xbt_error_t gras_trp_tcp_setup(gras_trp_plugin_t *plug) {
75 gras_trp_tcp_plug_data_t *data = xbt_new(gras_trp_tcp_plug_data_t,1);
77 FD_ZERO(&(data->msg_socks));
78 FD_ZERO(&(data->raw_socks));
80 plug->socket_client = gras_trp_tcp_socket_client;
81 plug->socket_server = gras_trp_tcp_socket_server;
82 plug->socket_accept = gras_trp_tcp_socket_accept;
83 plug->socket_close = gras_trp_tcp_socket_close;
85 plug->chunk_send = gras_trp_tcp_chunk_send;
86 plug->chunk_recv = gras_trp_tcp_chunk_recv;
88 plug->flush = NULL; /* nothing's cached */
90 plug->data = (void*)data;
91 plug->exit = gras_trp_tcp_exit;
96 void gras_trp_tcp_exit(gras_trp_plugin_t *plug) {
97 DEBUG1("Exit plugin TCP (free %p)", plug->data);
101 xbt_error_t gras_trp_tcp_socket_client(gras_trp_plugin_t *self,
104 struct sockaddr_in addr;
106 struct in_addr *haddr;
107 int size = sock->bufSize * 1024;
109 sock->incoming = 1; /* TCP sockets are duplex'ed */
111 sock->sd = socket (AF_INET, SOCK_STREAM, 0);
115 "Failed to create socket: %s",
119 if (setsockopt(sock->sd, SOL_SOCKET, SO_RCVBUF, (char *)&size, sizeof(size)) ||
120 setsockopt(sock->sd, SOL_SOCKET, SO_SNDBUF, (char *)&size, sizeof(size))) {
121 WARN1("setsockopt failed, cannot set buffer size: %s",
125 he = gethostbyname (sock->peer_name);
128 "Failed to lookup hostname %s: %s",
129 sock->peer_name, strerror (errno));
132 haddr = ((struct in_addr *) (he->h_addr_list)[0]);
134 memset(&addr, 0, sizeof(struct sockaddr_in));
135 memcpy (&addr.sin_addr, haddr, sizeof(struct in_addr));
136 addr.sin_family = AF_INET;
137 addr.sin_port = htons (sock->peer_port);
139 if (connect (sock->sd, (struct sockaddr*) &addr, sizeof (addr)) < 0) {
142 "Failed to connect socket to %s:%d (%s)",
143 sock->peer_name, sock->peer_port, strerror (errno));
150 * gras_trp_tcp_socket_server:
152 * Open a socket used to receive messages.
154 xbt_error_t gras_trp_tcp_socket_server(gras_trp_plugin_t *self,
155 /* OUT */ gras_socket_t sock){
156 int size = sock->bufSize * 1024;
158 struct sockaddr_in server;
160 gras_trp_tcp_plug_data_t *tcp=(gras_trp_tcp_plug_data_t*)self->data;
162 sock->outgoing = 1; /* TCP => duplex mode */
164 server.sin_port = htons((u_short)sock->port);
165 server.sin_addr.s_addr = INADDR_ANY;
166 server.sin_family = AF_INET;
167 if((sock->sd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
168 RAISE1(system_error,"Socket allocation failed: %s", strerror(errno));
171 if (setsockopt(sock->sd, SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on))) {
172 RAISE1(system_error,"setsockopt failed, cannot condition the socket: %s",
176 if (setsockopt(sock->sd, SOL_SOCKET, SO_RCVBUF, (char *)&size, sizeof(size)) ||
177 setsockopt(sock->sd, SOL_SOCKET, SO_SNDBUF, (char *)&size, sizeof(size))) {
178 WARN1("setsockopt failed, cannot set buffer size: %s",
182 if (bind(sock->sd, (struct sockaddr *)&server, sizeof(server)) == -1) {
184 RAISE2(system_error,"Cannot bind to port %d: %s",sock->port, strerror(errno));
187 if (listen(sock->sd, 5) < 0) {
189 RAISE2(system_error,"Cannot listen to port %d: %s",sock->port,strerror(errno));
193 FD_SET(sock->sd, &(tcp->raw_socks));
195 FD_SET(sock->sd, &(tcp->msg_socks));
197 DEBUG2("Openned a server socket on port %d (sock %d)",sock->port,sock->sd);
203 gras_trp_tcp_socket_accept(gras_socket_t sock,
204 gras_socket_t *dst) {
207 struct sockaddr_in peer_in;
208 socklen_t peer_in_len = sizeof(peer_in);
214 gras_trp_socket_new(1,&res);
216 sd = accept(sock->sd, (struct sockaddr *)&peer_in, &peer_in_len);
220 gras_socket_close(sock);
222 "Accept failed (%s). Droping server socket.", strerror(tmp_errno));
225 socklen_t s = sizeof(int);
227 if (setsockopt(sd, SOL_SOCKET, SO_KEEPALIVE, (char *)&i, s)
228 || setsockopt(sd, TcpProtoNumber(), TCP_NODELAY, (char *)&i, s)) {
229 RAISE1(system_error,"setsockopt failed, cannot condition the socket: %s",
233 (*dst)->bufSize = sock->bufSize;
234 size = sock->bufSize * 1024;
235 if (setsockopt(sd, SOL_SOCKET, SO_RCVBUF, (char *)&size, sizeof(size))
236 || setsockopt(sd, SOL_SOCKET, SO_SNDBUF, (char *)&size, sizeof(size))) {
237 WARN1("setsockopt failed, cannot set buffer size: %s",
241 res->plugin = sock->plugin;
242 res->incoming = sock->incoming;
243 res->outgoing = sock->outgoing;
247 res->peer_port = peer_in.sin_port;
249 /* FIXME: Lock to protect inet_ntoa */
250 if (((struct sockaddr *)&peer_in)->sa_family != AF_INET) {
251 res->peer_name = (char*)strdup("unknown");
253 struct in_addr addrAsInAddr;
256 addrAsInAddr.s_addr = peer_in.sin_addr.s_addr;
258 tmp = inet_ntoa(addrAsInAddr);
260 res->peer_name = (char*)strdup(tmp);
262 res->peer_name = (char*)strdup("unknown");
266 VERB3("accepted socket %d to %s:%d", sd, res->peer_name,res->peer_port);
274 void gras_trp_tcp_socket_close(gras_socket_t sock){
275 gras_trp_tcp_plug_data_t *tcp;
277 if (!sock) return; /* close only once */
278 tcp=sock->plugin->data;
280 DEBUG1("close tcp connection %d", sock->sd);
282 /* FIXME: no pipe in GRAS so far
283 if(!FD_ISSET(sd, &connectedPipes)) {
284 if(shutdown(sd, 2) < 0) {
287 ReleaseNWSLock(&lock);
289 / * The other side may have beaten us to the reset. * /
290 if ((tmp_errno!=ENOTCONN) && (tmp_errno!=ECONNRESET)) {
291 WARN1("CloseSocket: shutdown error %d\n", tmp_errno);
296 /* forget about the socket */
298 FD_CLR(sock->sd, &(tcp->raw_socks));
300 FD_CLR(sock->sd, &(tcp->msg_socks));
302 /* close the socket */
303 if(close(sock->sd) < 0) {
304 WARN3("error while closing tcp socket %d: %d (%s)\n",
305 sock->sd, errno, strerror(errno));
310 * gras_trp_tcp_chunk_send:
312 * Send data on a TCP socket
315 gras_trp_tcp_chunk_send(gras_socket_t sock,
319 /* TCP sockets are in duplex mode, don't check direction */
320 xbt_assert0(size >= 0, "Cannot send a negative amount of data");
325 status = write(sock->sd, data, (size_t)size);
326 DEBUG3("write(%d, %p, %ld);", sock->sd, data, size);
329 RAISE4(system_error,"write(%d,%p,%ld) failed: %s",
330 sock->sd, data, size,
338 RAISE0(system_error,"file descriptor closed");
345 * gras_trp_tcp_chunk_recv:
347 * Receive data on a TCP socket.
350 gras_trp_tcp_chunk_recv(gras_socket_t sock,
354 /* TCP sockets are in duplex mode, don't check direction */
355 xbt_assert0(sock, "Cannot recv on an NULL socket");
356 xbt_assert0(size >= 0, "Cannot receive a negative amount of data");
361 status = read(sock->sd, data, (size_t)size);
362 DEBUG3("read(%d, %p, %ld);", sock->sd, data, size);
365 RAISE4(system_error,"read(%d,%p,%d) failed: %s",
366 sock->sd, data, (int)size,
374 RAISE0(system_error,"file descriptor closed");
383 * Returns the tcp protocol number from the network protocol data base.
385 * getprotobyname() is not thread safe. We need to lock it.
387 static int TcpProtoNumber(void) {
388 struct protoent *fetchedEntry;
389 static int returnValue = 0;
391 if(returnValue == 0) {
392 fetchedEntry = getprotobyname("tcp");
393 xbt_assert0(fetchedEntry, "getprotobyname(tcp) gave NULL");
394 returnValue = fetchedEntry->p_proto;
400 /* Data exchange over raw sockets. Placing this in there is a kind of crude hack.
401 It means that the only possible raw are TCP where we may want to do UDP for them.
402 But I fail to find a good internal organization for now. We may want to split
403 raw and regular sockets more efficiently.
405 xbt_error_t gras_socket_raw_exchange(gras_socket_t peer,
407 unsigned int timeout,
408 unsigned long int exp_size,
409 unsigned long int msg_size) {
411 int res_last, msg_sofar, exp_sofar;
416 struct timeval timeOut;
418 chunk = xbt_malloc(msg_size);
420 for (exp_sofar=0; exp_sofar < exp_size; exp_sofar += msg_size) {
421 for(msg_sofar=0; msg_sofar < msg_size; msg_sofar += res_last) {
424 res_last = send(peer->sd, chunk, msg_size - msg_sofar, 0);
428 FD_SET(peer->sd,&rd_set);
429 timeOut.tv_sec = timeout;
432 if (0 < select(peer->sd+1,&rd_set,NULL,NULL,&timeOut))
433 res_last = recv(peer->sd, chunk, msg_size-msg_sofar, 0);
437 /* No progress done, bail out */
439 RAISE0(unknown_error,"Not exchanged a single byte, bailing out");