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() */
24 #include "gras_private.h"
25 #include "transport_private.h"
27 GRAS_LOG_NEW_DEFAULT_SUBCATEGORY(trp_tcp,transport);
31 } gras_trp_tcp_sock_specific_t;
36 gras_error_t gras_trp_tcp_socket_client(gras_trp_plugin_t *self,
40 /* OUT */ gras_socket_t **dst);
41 gras_error_t gras_trp_tcp_socket_server(gras_trp_plugin_t *self,
44 /* OUT */ gras_socket_t **dst);
45 gras_error_t gras_trp_tcp_socket_accept(gras_socket_t *sock,
48 void gras_trp_tcp_socket_close(gras_socket_t *sd);
50 gras_error_t gras_trp_tcp_bloc_send(gras_socket_t *sd,
54 gras_error_t gras_trp_tcp_bloc_recv(gras_socket_t *sd,
58 void gras_trp_tcp_free_specific(void *s);
61 static int TcpProtoNumber(void);
63 *** Specific plugin part
67 fd_set incoming_socks;
68 } gras_trp_tcp_specific_t;
71 *** Specific socket part
79 gras_trp_tcp_init(gras_trp_plugin_t **dst) {
81 gras_trp_plugin_t *res=malloc(sizeof(gras_trp_plugin_t));
82 gras_trp_tcp_specific_t *tcp = malloc(sizeof(gras_trp_tcp_specific_t));
86 FD_ZERO(&(tcp->incoming_socks));
88 res->socket_client = gras_trp_tcp_socket_client;
89 res->socket_server = gras_trp_tcp_socket_server;
90 res->socket_accept = gras_trp_tcp_socket_accept;
91 res->socket_close = gras_trp_tcp_socket_close;
93 res->specific = (void*)tcp;
94 res->free_specific = gras_trp_tcp_free_specific;
100 void gras_trp_tcp_free_specific(void *s) {
101 gras_trp_tcp_specific_t *specific = s;
105 gras_error_t gras_trp_tcp_socket_client(gras_trp_plugin_t *self,
108 unsigned int bufSize,
109 /* OUT */ gras_socket_t **dst){
112 IPAddress addresses[10];
116 if (!(*sock=malloc(sizeof(gras_socket_t))))
119 (*sock)->peer_addr=NULL;
121 if (!(addrCount = IPAddressValues(host, addresses, 10))) {
123 "tcp address retrieval of '%s' failed: %s",
124 host,strerror(errno));
127 for(i = 0; i < addrCount && i<10 ; i++) {
128 if(CallAddr(addresses[i], port, &sd, -1)) {
130 (*sock)->port = port;
135 RAISE2(system_error,"Something wicked happenned while connecting to %s:%d",
140 * gras_trp_tcp_socket_server:
142 * Open a socket used to receive messages. bufSize is in ko.
144 gras_error_t gras_trp_tcp_socket_server(gras_trp_plugin_t *self,
146 unsigned int bufSize,
147 /* OUT */ gras_socket_t **dst){
148 int size = bufSize * 1024;
151 struct sockaddr_in server;
154 gras_trp_tcp_specific_t *data=(gras_trp_tcp_specific_t*)self -> specific;
156 res=malloc(sizeof(gras_socket_t));
160 server.sin_port = htons((u_short)port);
161 server.sin_addr.s_addr = INADDR_ANY;
162 server.sin_family = AF_INET;
163 if((sd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
165 RAISE1(system_error,"socket allocation failed: %s", strerror(errno));
168 (void)setsockopt(sd, SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on));
169 (void)setsockopt(sd, SOL_SOCKET, SO_RCVBUF, (char *)&size, sizeof(size));
170 (void)setsockopt(sd, SOL_SOCKET, SO_SNDBUF, (char *)&size, sizeof(size));
171 if (bind(sd, (struct sockaddr *)&server, sizeof(server)) == -1) {
174 RAISE2(system_error,"Cannot bind to port %d: %s",port, strerror(errno));
177 if (listen(sd, 5) != -1) {
180 RAISE2(system_error,"Cannot listen to port %d: %s",port,strerror(errno));
183 FD_SET(sd, &(data->incoming_socks));
193 DEBUG2("Openned a server socket on port %d (sock %d)",port,sd);
199 gras_trp_tcp_socket_accept(gras_socket_t *sock,
200 gras_socket_t **dst) {
203 struct sockaddr_in peer_in;
204 socklen_t peer_in_len = sizeof(peer_in);
209 res=malloc(sizeof(gras_socket_t));
213 sd = accept(sock->sd, (struct sockaddr *)&peer_in, &peer_in_len);
217 gras_socket_close(sock);
219 "Accept failed (%s). Droping server socket.", strerror(tmp_errno));
222 socklen_t s = sizeof(int);
224 if (setsockopt(sd, SOL_SOCKET, SO_KEEPALIVE, (char *)&i, s)
225 || setsockopt(sd, TcpProtoNumber(), TCP_NODELAY, (char *)&i, s)) {
226 WARNING0("setsockopt failed, cannot condition the accepted socket");
229 i = ((gras_trp_tcp_sock_specific_t*)sock->specific)->buffsize;
230 if (setsockopt(sd, SOL_SOCKET, SO_RCVBUF, (char *)&i, s)
231 || setsockopt(sd, SOL_SOCKET, SO_SNDBUF, (char *)&i, s)) {
232 WARNING0("setsockopt failed, cannot set buffsize");
235 res->plugin = sock->plugin;
239 res->peer_port= peer_in.sin_port;
241 if (((struct sockaddr *)&peer_in)->sa_family != AF_INET) {
242 res->peer_name = strdup("unknown");
244 struct in_addr addrAsInAddr;
247 addrAsInAddr.s_addr = peer_in.sin_addr.s_addr;
249 tmp = inet_ntoa(addrAsInAddr);
251 res->peer_name = strdup(inet_ntoa(addrAsInAddr));
253 res->peer_name = strdup("unknown");
257 VERB3("accepted socket %d to %s:%d\n", sd, res->peer_name,res->peer_port);
265 void gras_trp_tcp_socket_close(gras_socket_t *sock){
266 gras_trp_tcp_specific_t *tcp;
268 if (!sock) return; /* close only once */
269 tcp=sock->plugin->specific;
271 DEBUG1("close tcp connection %d\n", sock->sd);
273 /* FIXME: no pipe in GRAS so far
274 if(!FD_ISSET(sd, &connectedPipes)) {
275 if(shutdown(sd, 2) < 0) {
278 ReleaseNWSLock(&lock);
280 / * The other side may have beaten us to the reset. * /
281 if ((tmp_errno!=ENOTCONN) && (tmp_errno!=ECONNRESET)) {
282 WARN1("CloseSocket: shutdown error %d\n", tmp_errno);
287 /* close the socket */
288 if(close(sock->sd) < 0) {
289 WARNING3("error while closing tcp socket %d: %d (%s)\n", sock->sd, errno, strerror(errno));
292 /* forget about it */
293 FD_CLR(sock->sd, &(tcp->incoming_socks));
298 * gras_trp_tcp_chunk_send:
300 * Send data on a TCP socket
303 gras_trp_tcp_chunk_send(gras_socket_t *sock,
307 /* gras_assert0(sock && !sock->incoming,
308 "Asked to send stuff on an incomming socket");*/
309 gras_assert0(size >= 0, "Cannot send a negative amount of data");
314 status = write(sock->sd, data, (size_t)size);
315 DEBUG3("write(%d, %p, %ld);\n", sock->sd, data, size);
318 RAISE4(system_error,"write(%d,%p,%d) failed: %s",
319 sock->sd, data, (int)size,
327 RAISE0(system_error,"file descriptor closed");
334 * gras_trp_tcp_chunk_recv:
336 * Receive data on a TCP socket.
339 gras_trp_tcp_chunk_recv(gras_socket_t *sock,
342 gras_assert0(sock && !sock->incoming,
343 "Ascked to receive stuff on an outcomming socket");
344 gras_assert0(size >= 0, "Cannot receive a negative amount of data");
349 status = read(sock->sd, data, (size_t)size);
350 DEBUG3("read(%d, %p, %ld);\n", sock->sd, data, size);
353 RAISE4(system_error,"read(%d,%p,%d) failed: %s",
354 sock->sd, data, (int)size,
362 RAISE0(system_error,"file descriptor closed");
371 * Returns the tcp protocol number from the network protocol data base.
373 * getprotobyname() is not thread safe. We need to lock it.
375 static int TcpProtoNumber(void) {
376 struct protoent *fetchedEntry;
377 static int returnValue = 0;
379 if(returnValue == 0) {
380 fetchedEntry = getprotobyname("tcp");
381 gras_assert0(fetchedEntry, "getprotobyname(tcp) gave NULL");
382 returnValue = fetchedEntry->p_proto;