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).
16 #include <sys/types.h>
18 #include <sys/socket.h>
19 #include <netinet/in.h>
20 #include <arpa/inet.h>
31 #include "sysdep_decls.h"
33 #include "clientsocket.h"
36 #define INADDR_NONE 0xffffffff
39 int sock_connect(char *host, char *service, char *protocol)
44 struct sockaddr_in sin;
45 struct sockaddr_in egress_sin;
48 if (host == NULL) return(-1);
49 if (strlen(host) == 0) return(-1);
50 if (service == NULL) return(-1);
51 if (strlen(service) == 0) return(-1);
52 if (protocol == NULL) return(-1);
53 if (strlen(protocol) == 0) return(-1);
55 memset(&sin, 0, sizeof(sin));
56 sin.sin_family = AF_INET;
58 pse = getservbyname(service, protocol);
60 sin.sin_port = pse->s_port;
61 } else if ((sin.sin_port = htons((u_short) atoi(service))) == 0) {
62 lprintf(CTDL_CRIT, "Can't get %s service entry: %s\n",
63 service, strerror(errno));
66 phe = gethostbyname(host);
68 memcpy(&sin.sin_addr, phe->h_addr, phe->h_length);
69 } else if ((sin.sin_addr.s_addr = inet_addr(host)) == INADDR_NONE) {
70 lprintf(CTDL_ERR, "Can't get %s host entry: %s\n",
71 host, strerror(errno));
74 if ((ppe = getprotobyname(protocol)) == 0) {
75 lprintf(CTDL_CRIT, "Can't get %s protocol entry: %s\n",
76 protocol, strerror(errno));
79 if (!strcmp(protocol, "udp")) {
85 s = socket(PF_INET, type, ppe->p_proto);
87 lprintf(CTDL_CRIT, "Can't create socket: %s\n", strerror(errno));
91 /* If citserver is bound to a specific IP address on the host, make
92 * sure we use that address for outbound connections.
94 memset(&egress_sin, 0, sizeof(egress_sin));
95 egress_sin.sin_family = AF_INET;
96 if (strlen(config.c_ip_addr) > 0) {
97 egress_sin.sin_addr.s_addr = inet_addr(config.c_ip_addr);
98 if (egress_sin.sin_addr.s_addr == !INADDR_ANY) {
99 egress_sin.sin_addr.s_addr = INADDR_ANY;
102 /* If this bind fails, no problem; we can still use INADDR_ANY */
103 bind(s, (struct sockaddr *)&egress_sin, sizeof(egress_sin));
106 /* Now try to connect to the remote host. */
107 if (connect(s, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
108 lprintf(CTDL_ERR, "Can't connect to %s:%s: %s\n",
109 host, service, strerror(errno));
120 * sock_read_to() - input binary data from socket, with a settable timeout.
121 * Returns the number of bytes read, or -1 for error.
123 int sock_read_to(int sock, char *buf, int bytes, int timeout)
137 retval = select(sock+1, &rfds, NULL, NULL, &tv);
139 if (FD_ISSET(sock, &rfds) == 0) { /* timed out */
140 lprintf(CTDL_ERR, "sock_read() timed out.\n");
144 rlen = read(sock, &buf[len], bytes-len);
146 lprintf(CTDL_ERR, "sock_read() failed: %s\n",
157 * sock_read() - input binary data from socket.
158 * Returns the number of bytes read, or -1 for error.
160 INLINE int sock_read(int sock, char *buf, int bytes)
162 return sock_read_to(sock, buf, bytes, CLIENT_TIMEOUT);
167 * sock_write() - send binary to server.
168 * Returns the number of bytes written, or -1 for error.
170 int sock_write(int sock, char *buf, int nbytes)
172 int bytes_written = 0;
174 while (bytes_written < nbytes) {
175 retval = write(sock, &buf[bytes_written],
176 nbytes - bytes_written);
180 bytes_written = bytes_written + retval;
182 return (bytes_written);
188 * Input string from socket - implemented in terms of sock_read()
191 int sock_gets(int sock, char *buf)
195 /* Read one character at a time.
198 if (sock_read(sock, &buf[i], 1) < 0) return(-1);
199 if (buf[i] == '\n' || i == (SIZ-1))
203 /* If we got a long line, discard characters until the newline.
206 while (buf[i] != '\n')
207 if (sock_read(sock, &buf[i], 1) < 0) return(-1);
209 /* Strip any trailing CR and LF characters.
212 while ( (strlen(buf)>0)
213 && ((buf[strlen(buf)-1]==13)
214 || (buf[strlen(buf)-1]==10)) ) {
215 buf[strlen(buf)-1] = 0;
221 * Multiline version of sock_gets() ... this is a convenience function for
222 * client side protocol implementations. It only returns the first line of
223 * a multiline response, discarding the rest.
225 int ml_sock_gets(int sock, char *buf) {
229 g = sock_gets(sock, buf);
230 if (g < 4) return(g);
231 if (buf[3] != '-') return(g);
234 g = sock_gets(sock, bigbuf);
235 if (g < 0) return(g);
236 } while ( (g >= 4) && (bigbuf[3] == '-') );
243 * sock_puts() - send line to server - implemented in terms of serv_write()
244 * Returns the number of bytes written, or -1 for error.
246 int sock_puts(int sock, char *buf)
250 i = sock_write(sock, buf, strlen(buf));
252 j = sock_write(sock, "\n", 1);