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 "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,
39 /* OUT */ gras_socket_t *sock);
40 gras_error_t gras_trp_tcp_socket_server(gras_trp_plugin_t *self,
42 /* OUT */ gras_socket_t *sock);
43 gras_error_t gras_trp_tcp_socket_accept(gras_socket_t *sock,
46 void gras_trp_tcp_socket_close(gras_socket_t *sd);
48 gras_error_t gras_trp_tcp_chunk_send(gras_socket_t *sd,
52 gras_error_t gras_trp_tcp_chunk_recv(gras_socket_t *sd,
56 void gras_trp_tcp_free_specific(void *s);
59 static int TcpProtoNumber(void);
61 *** Specific plugin part
65 fd_set incoming_socks;
66 } gras_trp_tcp_specific_t;
69 *** Specific socket part
77 gras_trp_tcp_init(gras_trp_plugin_t **dst) {
79 gras_trp_plugin_t *res=malloc(sizeof(gras_trp_plugin_t));
80 gras_trp_tcp_specific_t *tcp = malloc(sizeof(gras_trp_tcp_specific_t));
84 FD_ZERO(&(tcp->incoming_socks));
86 res->name = strdup("TCP");
87 res->socket_client = gras_trp_tcp_socket_client;
88 res->socket_server = gras_trp_tcp_socket_server;
89 res->socket_accept = gras_trp_tcp_socket_accept;
90 res->socket_close = gras_trp_tcp_socket_close;
92 res->chunk_send = gras_trp_tcp_chunk_send;
93 res->chunk_recv = gras_trp_tcp_chunk_recv;
95 res->specific = (void*)tcp;
96 res->free_specific = gras_trp_tcp_free_specific;
102 void gras_trp_tcp_free_specific(void *s) {
103 gras_trp_tcp_specific_t *specific = s;
107 gras_error_t gras_trp_tcp_socket_client(gras_trp_plugin_t *self,
110 /* OUT */ gras_socket_t *sock){
112 struct sockaddr_in addr;
114 struct in_addr *haddr;
116 sock->incoming = 1; /* TCP sockets are duplex'ed */
118 sock->sd = socket (AF_INET, SOCK_STREAM, 0);
122 "Failed to create socket: %s",
126 he = gethostbyname (host);
129 "Failed to lookup hostname %s: %s",
130 host, strerror (errno));
133 haddr = ((struct in_addr *) (he->h_addr_list)[0]);
135 memset(&addr, 0, sizeof(struct sockaddr_in));
136 memcpy (&addr.sin_addr, haddr, sizeof(struct in_addr));
137 addr.sin_family = AF_INET;
138 addr.sin_port = htons (port);
140 if (connect (sock->sd, (struct sockaddr*) &addr, sizeof (addr)) < 0) {
143 "Failed to connect socket to %s:%d (%s)",
144 host, port, strerror (errno));
151 * gras_trp_tcp_socket_server:
153 * Open a socket used to receive messages.
155 gras_error_t gras_trp_tcp_socket_server(gras_trp_plugin_t *self,
157 /* OUT */ gras_socket_t *sock){
158 // int size = bufSize * 1024;
160 struct sockaddr_in server;
162 gras_trp_tcp_specific_t *data=(gras_trp_tcp_specific_t*)self -> specific;
164 sock->outgoing = 1; /* TCP => duplex mode */
166 server.sin_port = htons((u_short)port);
167 server.sin_addr.s_addr = INADDR_ANY;
168 server.sin_family = AF_INET;
169 if((sock->sd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
170 RAISE1(system_error,"socket allocation failed: %s", strerror(errno));
173 (void)setsockopt(sock->sd, SOL_SOCKET, SO_REUSEADDR,
174 (char *)&on, sizeof(on));
176 (void)setsockopt(sd, SOL_SOCKET, SO_RCVBUF, (char *)&size, sizeof(size));
177 (void)setsockopt(sd, SOL_SOCKET, SO_SNDBUF, (char *)&size, sizeof(size));
179 if (bind(sock->sd, (struct sockaddr *)&server, sizeof(server)) == -1) {
181 RAISE2(system_error,"Cannot bind to port %d: %s",port, strerror(errno));
184 if (listen(sock->sd, 5) < 0) {
186 RAISE2(system_error,"Cannot listen to port %d: %s",port,strerror(errno));
189 FD_SET(sock->sd, &(data->incoming_socks));
191 DEBUG2("Openned a server socket on port %d (sock %d)",port,sock->sd);
197 gras_trp_tcp_socket_accept(gras_socket_t *sock,
198 gras_socket_t **dst) {
201 struct sockaddr_in peer_in;
202 socklen_t peer_in_len = sizeof(peer_in);
207 res=malloc(sizeof(gras_socket_t));
211 sd = accept(sock->sd, (struct sockaddr *)&peer_in, &peer_in_len);
215 gras_socket_close(&sock);
217 "Accept failed (%s). Droping server socket.", strerror(tmp_errno));
220 socklen_t s = sizeof(int);
222 if (setsockopt(sd, SOL_SOCKET, SO_KEEPALIVE, (char *)&i, s)
223 || setsockopt(sd, TcpProtoNumber(), TCP_NODELAY, (char *)&i, s)) {
224 WARNING0("setsockopt failed, cannot condition the accepted socket");
227 /* FIXME: bufSize removed until we can have optionsets
228 i = ((gras_trp_tcp_sock_specific_t*)sock->specific)->buffsize;
229 if (setsockopt(sd, SOL_SOCKET, SO_RCVBUF, (char *)&i, s)
230 || setsockopt(sd, SOL_SOCKET, SO_SNDBUF, (char *)&i, s)) {
231 WARNING0("setsockopt failed, cannot set buffsize");
235 res->plugin = sock->plugin;
236 res->incoming = sock->incoming;
237 res->outgoing = sock->outgoing;
241 res->peer_port = peer_in.sin_port;
243 /* FIXME: Lock to protect inet_ntoa */
244 if (((struct sockaddr *)&peer_in)->sa_family != AF_INET) {
245 res->peer_name = strdup("unknown");
247 struct in_addr addrAsInAddr;
250 addrAsInAddr.s_addr = peer_in.sin_addr.s_addr;
252 tmp = inet_ntoa(addrAsInAddr);
254 res->peer_name = strdup(tmp);
256 res->peer_name = strdup("unknown");
260 VERB3("accepted socket %d to %s:%d\n", sd, res->peer_name,res->peer_port);
268 void gras_trp_tcp_socket_close(gras_socket_t *sock){
269 gras_trp_tcp_specific_t *tcp;
271 if (!sock) return; /* close only once */
272 tcp=sock->plugin->specific;
274 DEBUG1("close tcp connection %d\n", sock->sd);
276 /* FIXME: no pipe in GRAS so far
277 if(!FD_ISSET(sd, &connectedPipes)) {
278 if(shutdown(sd, 2) < 0) {
281 ReleaseNWSLock(&lock);
283 / * The other side may have beaten us to the reset. * /
284 if ((tmp_errno!=ENOTCONN) && (tmp_errno!=ECONNRESET)) {
285 WARN1("CloseSocket: shutdown error %d\n", tmp_errno);
290 /* forget about the socket */
291 FD_CLR(sock->sd, &(tcp->incoming_socks));
293 /* close the socket */
294 if(close(sock->sd) < 0) {
295 WARNING3("error while closing tcp socket %d: %d (%s)\n",
296 sock->sd, errno, strerror(errno));
301 * gras_trp_tcp_chunk_send:
303 * Send data on a TCP socket
306 gras_trp_tcp_chunk_send(gras_socket_t *sock,
310 /* TCP sockets are in duplex mode, don't check direction */
311 gras_assert0(size >= 0, "Cannot send a negative amount of data");
316 status = write(sock->sd, data, (size_t)size);
317 DEBUG3("write(%d, %p, %ld);\n", sock->sd, data, size);
320 RAISE4(system_error,"write(%d,%p,%d) failed: %s",
321 sock->sd, data, (int)size,
329 RAISE0(system_error,"file descriptor closed");
336 * gras_trp_tcp_chunk_recv:
338 * Receive data on a TCP socket.
341 gras_trp_tcp_chunk_recv(gras_socket_t *sock,
345 /* TCP sockets are in duplex mode, don't check direction */
346 gras_assert0(sock, "Cannot recv on an NULL socket");
347 gras_assert0(size >= 0, "Cannot receive a negative amount of data");
352 status = read(sock->sd, data, (size_t)size);
353 DEBUG3("read(%d, %p, %ld);\n", sock->sd, data, size);
356 RAISE4(system_error,"read(%d,%p,%d) failed: %s",
357 sock->sd, data, (int)size,
365 RAISE0(system_error,"file descriptor closed");
374 * Returns the tcp protocol number from the network protocol data base.
376 * getprotobyname() is not thread safe. We need to lock it.
378 static int TcpProtoNumber(void) {
379 struct protoent *fetchedEntry;
380 static int returnValue = 0;
382 if(returnValue == 0) {
383 fetchedEntry = getprotobyname("tcp");
384 gras_assert0(fetchedEntry, "getprotobyname(tcp) gave NULL");
385 returnValue = fetchedEntry->p_proto;