4 * This module handles client-side sockets opened by the Citadel server (for
5 * the client side of Internet protocols, etc.) It does _not_ handle client
6 * sockets for the Citadel client; for that you must look in ipc_c_tcp.c
7 * (which, uncoincidentally, bears a striking similarity to this file).
9 * Copyright (c) 1987-2009 by the citadel.org team
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 3 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
31 #include <sys/types.h>
33 #include <sys/socket.h>
34 #include <netinet/in.h>
35 #include <arpa/inet.h>
41 #include <libcitadel.h>
47 #include "sysdep_decls.h"
49 #include "clientsocket.h"
51 #include "ctdl_module.h"
54 #define INADDR_NONE 0xffffffff
57 int sock_connect(char *host, char *service)
62 struct sockaddr_in sin;
63 struct sockaddr_in egress_sin;
66 if ((host == NULL) || IsEmptyStr(host))
68 if ((service == NULL) || IsEmptyStr(service))
71 memset(&sin, 0, sizeof(sin));
72 sin.sin_family = AF_INET;
74 pse = getservbyname(service, "tcp");
76 sin.sin_port = pse->s_port;
77 } else if ((sin.sin_port = htons((u_short) atoi(service))) == 0) {
78 CtdlLogPrintf(CTDL_CRIT, "Can't get %s service entry: %s\n",
79 service, strerror(errno));
82 phe = gethostbyname(host);
84 memcpy(&sin.sin_addr, phe->h_addr, phe->h_length);
85 } else if ((sin.sin_addr.s_addr = inet_addr(host)) == INADDR_NONE) {
86 CtdlLogPrintf(CTDL_ERR, "Can't get %s host entry: %s\n",
87 host, strerror(errno));
90 if ((ppe = getprotobyname("tcp")) == 0) {
91 CtdlLogPrintf(CTDL_CRIT, "Can't get tcp protocol entry: %s\n", strerror(errno));
96 s = socket(PF_INET, type, ppe->p_proto);
98 CtdlLogPrintf(CTDL_CRIT, "Can't create socket: %s\n", strerror(errno));
102 /* If citserver is bound to a specific IP address on the host, make
103 * sure we use that address for outbound connections.
105 memset(&egress_sin, 0, sizeof(egress_sin));
106 egress_sin.sin_family = AF_INET;
107 if (!IsEmptyStr(config.c_ip_addr)) {
108 egress_sin.sin_addr.s_addr = inet_addr(config.c_ip_addr);
109 if (egress_sin.sin_addr.s_addr == !INADDR_ANY) {
110 egress_sin.sin_addr.s_addr = INADDR_ANY;
113 /* If this bind fails, no problem; we can still use INADDR_ANY */
114 bind(s, (struct sockaddr *)&egress_sin, sizeof(egress_sin));
117 /* Now try to connect to the remote host. */
118 if (connect(s, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
119 CtdlLogPrintf(CTDL_ERR, "Can't connect to %s:%s: %s\n",
120 host, service, strerror(errno));
131 * Read data from the client socket.
133 * sock socket fd to read from
134 * buf buffer to read into
135 * bytes number of bytes to read
136 * timeout Number of seconds to wait before timing out
138 * Possible return values:
139 * 1 Requested number of bytes has been read.
140 * 0 Request timed out.
141 * -1 Connection is broken, or other error.
143 int socket_read_blob(int *Socket,
148 CitContext *CCC = MyContext();
153 retval = StrBufReadBLOBBuffered(Target,
162 CtdlLogPrintf(CTDL_CRIT,
171 int sock_read_to(int *sock, char *buf, int bytes, int timeout, int keep_reading_until_full)
173 CitContext *CCC = MyContext();
176 FlushStrBuf(CCC->MigrateBuf);
177 rc = socket_read_blob(sock,
188 if (StrLength(CCC->MigrateBuf) < bytes)
189 bytes = StrLength(CCC->MigrateBuf);
191 ChrPtr(CCC->MigrateBuf),
194 FlushStrBuf(CCC->MigrateBuf);
200 int CtdlSockGetLine(int *sock, StrBuf *Target)
202 CitContext *CCC = MyContext();
207 rc = StrBufTCP_read_buffered_line_fast(Target,
214 if ((rc < 0) && (Error != NULL))
215 CtdlLogPrintf(CTDL_CRIT,
224 * client_getln() ... Get a LF-terminated line of text from the client.
225 * (This is implemented in terms of client_read() and could be
226 * justifiably moved out of sysdep.c)
228 int sock_getln(int *sock, char *buf, int bufsize)
231 CitContext *CCC = MyContext();
234 FlushStrBuf(CCC->sMigrateBuf);
235 retval = CtdlSockGetLine(sock, CCC->sMigrateBuf);
237 i = StrLength(CCC->sMigrateBuf);
238 pCh = ChrPtr(CCC->sMigrateBuf);
239 /* Strip the trailing LF, and the trailing CR if present.
244 && ( (pCh[i - 1]==13)
245 || ( pCh[i - 1]==10)) ) {
251 FlushStrBuf(CCC->sMigrateBuf);
253 safestrncpy(&buf[i], "000", bufsize - i);
261 * sock_read() - input binary data from socket.
262 * Returns the number of bytes read, or -1 for error.
264 INLINE int sock_read(int *sock, char *buf, int bytes, int keep_reading_until_full)
266 return sock_read_to(sock, buf, bytes, CLIENT_TIMEOUT, keep_reading_until_full);
271 * sock_write() - send binary to server.
272 * Returns the number of bytes written, or -1 for error.
274 int sock_write(int *sock, const char *buf, int nbytes)
276 int bytes_written = 0;
279 while ((*sock != -1) &&
280 (bytes_written < nbytes))
282 retval = write(*sock, &buf[bytes_written],
283 nbytes - bytes_written);
289 bytes_written = bytes_written + retval;
291 return (bytes_written);
296 * Multiline version of sock_gets() ... this is a convenience function for
297 * client side protocol implementations. It only returns the first line of
298 * a multiline response, discarding the rest.
300 int ml_sock_gets(int *sock, char *buf) {
304 g = sock_getln(sock, buf, SIZ);
305 if (g < 4) return(g);
306 if (buf[3] != '-') return(g);
309 g = sock_getln(sock, bigbuf, SIZ);
310 if (g < 0) return(g);
311 } while ( (g >= 4) && (bigbuf[3] == '-') );
318 * sock_puts() - send line to server - implemented in terms of serv_write()
319 * Returns the number of bytes written, or -1 for error.
321 int sock_puts(int *sock, char *buf)
325 i = sock_write(sock, buf, strlen(buf));
327 j = sock_write(sock, "\n", 1);