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);
32 gras_error_t gras_trp_tcp_socket_client(gras_trp_plugin_t *self,
35 /* OUT */ gras_socket_t *sock);
36 gras_error_t gras_trp_tcp_socket_server(gras_trp_plugin_t *self,
38 /* OUT */ gras_socket_t *sock);
39 gras_error_t gras_trp_tcp_socket_accept(gras_socket_t *sock,
42 void gras_trp_tcp_socket_close(gras_socket_t *sd);
44 gras_error_t gras_trp_tcp_chunk_send(gras_socket_t *sd,
48 gras_error_t gras_trp_tcp_chunk_recv(gras_socket_t *sd,
52 void gras_trp_tcp_free_specific(void *s);
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;
78 gras_trp_tcp_setup(gras_trp_plugin_t *plug) {
80 gras_trp_tcp_plug_data_t *tcp = malloc(sizeof(gras_trp_tcp_plug_data_t));
84 FD_ZERO(&(tcp->msg_socks));
85 FD_ZERO(&(tcp->raw_socks));
87 plug->socket_client = gras_trp_tcp_socket_client;
88 plug->socket_server = gras_trp_tcp_socket_server;
89 plug->socket_accept = gras_trp_tcp_socket_accept;
90 plug->socket_close = gras_trp_tcp_socket_close;
92 plug->chunk_send = gras_trp_tcp_chunk_send;
93 plug->chunk_recv = gras_trp_tcp_chunk_recv;
95 plug->data = (void*)tcp;
100 gras_error_t gras_trp_tcp_socket_client(gras_trp_plugin_t *self,
103 /* OUT */ gras_socket_t *sock){
105 struct sockaddr_in addr;
107 struct in_addr *haddr;
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 he = gethostbyname (host);
122 "Failed to lookup hostname %s: %s",
123 host, strerror (errno));
126 haddr = ((struct in_addr *) (he->h_addr_list)[0]);
128 memset(&addr, 0, sizeof(struct sockaddr_in));
129 memcpy (&addr.sin_addr, haddr, sizeof(struct in_addr));
130 addr.sin_family = AF_INET;
131 addr.sin_port = htons (port);
133 if (connect (sock->sd, (struct sockaddr*) &addr, sizeof (addr)) < 0) {
136 "Failed to connect socket to %s:%d (%s)",
137 host, port, strerror (errno));
144 * gras_trp_tcp_socket_server:
146 * Open a socket used to receive messages.
148 gras_error_t gras_trp_tcp_socket_server(gras_trp_plugin_t *self,
150 /* OUT */ gras_socket_t *sock){
151 // int size = bufSize * 1024;
153 struct sockaddr_in server;
155 gras_trp_tcp_plug_data_t *tcp=(gras_trp_tcp_plug_data_t*)self->data;
157 sock->outgoing = 1; /* TCP => duplex mode */
159 server.sin_port = htons((u_short)port);
160 server.sin_addr.s_addr = INADDR_ANY;
161 server.sin_family = AF_INET;
162 if((sock->sd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
163 RAISE1(system_error,"socket allocation failed: %s", strerror(errno));
166 (void)setsockopt(sock->sd, SOL_SOCKET, SO_REUSEADDR,
167 (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));
172 if (bind(sock->sd, (struct sockaddr *)&server, sizeof(server)) == -1) {
174 RAISE2(system_error,"Cannot bind to port %d: %s",port, strerror(errno));
177 if (listen(sock->sd, 5) < 0) {
179 RAISE2(system_error,"Cannot listen to port %d: %s",port,strerror(errno));
183 FD_SET(sock->sd, &(tcp->raw_socks));
185 FD_SET(sock->sd, &(tcp->msg_socks));
187 DEBUG2("Openned a server socket on port %d (sock %d)",port,sock->sd);
193 gras_trp_tcp_socket_accept(gras_socket_t *sock,
194 gras_socket_t **dst) {
197 struct sockaddr_in peer_in;
198 socklen_t peer_in_len = sizeof(peer_in);
203 res=malloc(sizeof(gras_socket_t));
207 sd = accept(sock->sd, (struct sockaddr *)&peer_in, &peer_in_len);
211 gras_socket_close(&sock);
213 "Accept failed (%s). Droping server socket.", strerror(tmp_errno));
216 socklen_t s = sizeof(int);
218 if (setsockopt(sd, SOL_SOCKET, SO_KEEPALIVE, (char *)&i, s)
219 || setsockopt(sd, TcpProtoNumber(), TCP_NODELAY, (char *)&i, s)) {
220 WARN0("setsockopt failed, cannot condition the accepted socket");
223 /* FIXME: bufSize removed until we can have optionsets
224 i = ((gras_trp_tcp_sock_specific_t*)sock->specific)->buffsize;
225 if (setsockopt(sd, SOL_SOCKET, SO_RCVBUF, (char *)&i, s)
226 || setsockopt(sd, SOL_SOCKET, SO_SNDBUF, (char *)&i, s)) {
227 WARNING0("setsockopt failed, cannot set buffsize");
231 res->plugin = sock->plugin;
232 res->incoming = sock->incoming;
233 res->outgoing = sock->outgoing;
237 res->peer_port = peer_in.sin_port;
239 /* FIXME: Lock to protect inet_ntoa */
240 if (((struct sockaddr *)&peer_in)->sa_family != AF_INET) {
241 res->peer_name = strdup("unknown");
243 struct in_addr addrAsInAddr;
246 addrAsInAddr.s_addr = peer_in.sin_addr.s_addr;
248 tmp = inet_ntoa(addrAsInAddr);
250 res->peer_name = strdup(tmp);
252 res->peer_name = strdup("unknown");
256 VERB3("accepted socket %d to %s:%d\n", sd, res->peer_name,res->peer_port);
264 void gras_trp_tcp_socket_close(gras_socket_t *sock){
265 gras_trp_tcp_plug_data_t *tcp;
267 if (!sock) return; /* close only once */
268 tcp=sock->plugin->data;
270 DEBUG1("close tcp connection %d\n", sock->sd);
272 /* FIXME: no pipe in GRAS so far
273 if(!FD_ISSET(sd, &connectedPipes)) {
274 if(shutdown(sd, 2) < 0) {
277 ReleaseNWSLock(&lock);
279 / * The other side may have beaten us to the reset. * /
280 if ((tmp_errno!=ENOTCONN) && (tmp_errno!=ECONNRESET)) {
281 WARN1("CloseSocket: shutdown error %d\n", tmp_errno);
286 /* forget about the socket */
288 FD_CLR(sock->sd, &(tcp->raw_socks));
290 FD_CLR(sock->sd, &(tcp->msg_socks));
292 /* close the socket */
293 if(close(sock->sd) < 0) {
294 WARN3("error while closing tcp socket %d: %d (%s)\n",
295 sock->sd, errno, strerror(errno));
300 * gras_trp_tcp_chunk_send:
302 * Send data on a TCP socket
305 gras_trp_tcp_chunk_send(gras_socket_t *sock,
309 /* TCP sockets are in duplex mode, don't check direction */
310 gras_assert0(size >= 0, "Cannot send a negative amount of data");
315 status = write(sock->sd, data, (size_t)size);
316 DEBUG3("write(%d, %p, %ld);\n", sock->sd, data, size);
319 RAISE4(system_error,"write(%d,%p,%d) failed: %s",
320 sock->sd, data, (int)size,
328 RAISE0(system_error,"file descriptor closed");
335 * gras_trp_tcp_chunk_recv:
337 * Receive data on a TCP socket.
340 gras_trp_tcp_chunk_recv(gras_socket_t *sock,
344 /* TCP sockets are in duplex mode, don't check direction */
345 gras_assert0(sock, "Cannot recv on an NULL socket");
346 gras_assert0(size >= 0, "Cannot receive a negative amount of data");
351 status = read(sock->sd, data, (size_t)size);
352 DEBUG3("read(%d, %p, %ld);\n", sock->sd, data, size);
355 RAISE4(system_error,"read(%d,%p,%d) failed: %s",
356 sock->sd, data, (int)size,
364 RAISE0(system_error,"file descriptor closed");
373 * Returns the tcp protocol number from the network protocol data base.
375 * getprotobyname() is not thread safe. We need to lock it.
377 static int TcpProtoNumber(void) {
378 struct protoent *fetchedEntry;
379 static int returnValue = 0;
381 if(returnValue == 0) {
382 fetchedEntry = getprotobyname("tcp");
383 gras_assert0(fetchedEntry, "getprotobyname(tcp) gave NULL");
384 returnValue = fetchedEntry->p_proto;