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->bloc_send = gras_trp_tcp_bloc_send;
94 res->bloc_recv = gras_trp_tcp_bloc_recv;
96 res->specific = (void*)tcp;
97 res->free_specific = gras_trp_tcp_free_specific;
103 void gras_trp_tcp_free_specific(void *s) {
104 gras_trp_tcp_specific_t *specific = s;
108 gras_error_t gras_trp_tcp_socket_client(gras_trp_plugin_t *self,
111 unsigned int bufSize,
112 /* OUT */ gras_socket_t **dst){
115 IPAddress addresses[10];
119 if (!(*sock=malloc(sizeof(gras_socket_t)))) {
120 fprintf(stderr,"Malloc error\n");
123 (*sock)->peer_addr=NULL;
125 if (!(addrCount = IPAddressValues(host, addresses, 10))) {
126 fprintf(stderr,"grasOpenClientSocket: address retrieval of '%s' failed\n",host);
130 for(i = 0; i < addrCount && i<10 ; i++) {
131 if(CallAddr(addresses[i], port, &sd, -1)) {
133 (*sock)->port = port;
138 fprintf(stderr,"grasOpenClientSocket: something wicked happenned while connecting to %s:%d",
146 * gras_trp_tcp_socket_server:
148 * Open a socket used to receive messages. bufSize is in ko.
150 gras_error_t gras_trp_tcp_socket_server(gras_trp_plugin_t *self,
152 unsigned int bufSize,
153 /* OUT */ gras_socket_t **dst){
154 int size = bufSize * 1024;
157 struct sockaddr_in server;
160 gras_trp_tcp_specific_t *data=(gras_trp_tcp_specific_t*)self -> specific;
162 res=malloc(sizeof(gras_socket_t));
166 server.sin_port = htons((u_short)port);
167 server.sin_addr.s_addr = INADDR_ANY;
168 server.sin_family = AF_INET;
169 if((sd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
171 RAISE0(system_error,"socket allocation failed");
174 (void)setsockopt(sd, SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on));
175 (void)setsockopt(sd, SOL_SOCKET, SO_RCVBUF, (char *)&size, sizeof(size));
176 (void)setsockopt(sd, SOL_SOCKET, SO_SNDBUF, (char *)&size, sizeof(size));
177 if (bind(sd, (struct sockaddr *)&server, sizeof(server)) == -1) {
180 RAISE1(system_error,"Cannot bind to port %d",port);
183 if (listen(sd, 5) != -1) {
186 RAISE1(system_error,"Cannot listen to port %d",port);
189 FD_SET(sd, &(data->incoming_socks));
199 DEBUG2("Openned a server socket on port %d (sock %d)",port,sd);
205 gras_trp_tcp_socket_accept(gras_socket_t *sock,
206 gras_socket_t **dst) {
209 struct sockaddr_in peer_in;
210 socklen_t peer_in_len = sizeof(peer_in);
215 res=malloc(sizeof(gras_socket_t));
219 sd = accept(sock->sd, (struct sockaddr *)&peer_in, &peer_in_len);
223 gras_socket_close(sock);
225 "Accept failed (%s). Droping server socket.", strerror(tmp_errno));
228 socklen_t s = sizeof(int);
230 if (setsockopt(sd, SOL_SOCKET, SO_KEEPALIVE, (char *)&i, s)
231 || setsockopt(sd, TcpProtoNumber(), TCP_NODELAY, (char *)&i, s)) {
232 WARNING0("setsockopt failed, cannot condition the accepted socket");
235 i = ((gras_trp_tcp_sock_specific_t*)sock->specific)->buffsize;
236 if (setsockopt(sd, SOL_SOCKET, SO_RCVBUF, (char *)&i, s)
237 || setsockopt(sd, SOL_SOCKET, SO_SNDBUF, (char *)&i, s)) {
238 WARNING0("setsockopt failed, cannot set buffsize");
241 res->plugin = sock->plugin;
245 res->peer_port= peer_in.sin_port;
247 if (((struct sockaddr *)&peer_in)->sa_family != AF_INET) {
248 res->peer_name = strdup("unknown");
250 struct in_addr addrAsInAddr;
253 addrAsInAddr.s_addr = peer_in.sin_addr.s_addr;
255 tmp = inet_ntoa(addrAsInAddr);
257 res->peer_name = strdup(inet_ntoa(addrAsInAddr));
259 res->peer_name = strdup("unknown");
263 VERB3("accepted socket %d to %s:%d\n", sd, res->peer_name,res->peer_port);
271 void gras_trp_tcp_socket_close(gras_socket_t *sock){
272 gras_trp_tcp_specific_t *tcp;
274 if (!sock) return; /* close only once */
275 tcp=sock->plugin->specific;
277 DEBUG1("close tcp connection %d\n", sock->sd);
279 /* FIXME: no pipe in GRAS so far
280 if(!FD_ISSET(sd, &connectedPipes)) {
281 if(shutdown(sd, 2) < 0) {
284 ReleaseNWSLock(&lock);
286 / * The other side may have beaten us to the reset. * /
287 if ((tmp_errno!=ENOTCONN) && (tmp_errno!=ECONNRESET)) {
288 WARN1("CloseSocket: shutdown error %d\n", tmp_errno);
293 /* close the socket */
294 if(close(sock->sd) < 0) {
295 WARNING3("error while closing tcp socket %d: %d (%s)\n", sock->sd, errno, strerror(errno));
298 /* forget about it */
299 FD_CLR(sock->sd, &(tcp->incoming_socks));
303 gras_error_t gras_trp_tcp_bloc_send(gras_socket_t *sock,
307 gras_assert0(sock && !sock->incoming, "Ascked to send stuff on an incomming socket");
308 gras_assert0(size >= 0, "Cannot send a negative amount of data");
313 status = write(sock->sd, data, (size_t)size);
314 DEBUG3("write(%d, %p, %ld);\n", sock->sd, data, size);
317 RAISE4(system_error,"write(%d,%p,%d) failed: %s",
318 sock->sd, data, (int)size,
326 RAISE0(system_error,"file descriptor closed");
333 gras_error_t gras_trp_tcp_bloc_recv(gras_socket_t *sock,
337 gras_assert0(sock && !sock->incoming, "Ascked to receive stuff on an outcomming socket");
338 gras_assert0(size >= 0, "Cannot receive a negative amount of data");
343 status = read(sock->sd, data, (size_t)size);
344 DEBUG3("read(%d, %p, %ld);\n", sock->sd, data, size);
347 RAISE4(system_error,"read(%d,%p,%d) failed: %s",
348 sock->sd, data, (int)size,
356 RAISE0(system_error,"file descriptor closed");
365 * Returns the tcp protocol number from the network protocol data base.
367 * getprotobyname() is not thread safe. We need to lock it.
369 static int TcpProtoNumber(void) {
370 struct protoent *fetchedEntry;
371 static int returnValue = 0;
373 if(returnValue == 0) {
374 fetchedEntry = getprotobyname("tcp");
375 gras_assert0(fetchedEntry, "getprotobyname(tcp) gave NULL");
376 returnValue = fetchedEntry->p_proto;