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>
28 #include "serv_extensions.h"
32 #include "sysdep_decls.h"
34 #include "clientsocket.h"
37 #define INADDR_NONE 0xffffffff
40 int sock_connect(char *host, char *service, char *protocol)
45 struct sockaddr_in sin;
46 struct sockaddr_in egress_sin;
49 if (host == NULL) return(-1);
50 if (strlen(host) == 0) return(-1);
51 if (service == NULL) return(-1);
52 if (strlen(service) == 0) return(-1);
53 if (protocol == NULL) return(-1);
54 if (strlen(protocol) == 0) return(-1);
56 memset(&sin, 0, sizeof(sin));
57 sin.sin_family = AF_INET;
59 pse = getservbyname(service, protocol);
61 sin.sin_port = pse->s_port;
62 } else if ((sin.sin_port = htons((u_short) atoi(service))) == 0) {
63 lprintf(CTDL_CRIT, "Can't get %s service entry: %s\n",
64 service, strerror(errno));
67 phe = gethostbyname(host);
69 memcpy(&sin.sin_addr, phe->h_addr, phe->h_length);
70 } else if ((sin.sin_addr.s_addr = inet_addr(host)) == INADDR_NONE) {
71 lprintf(CTDL_ERR, "Can't get %s host entry: %s\n",
72 host, strerror(errno));
75 if ((ppe = getprotobyname(protocol)) == 0) {
76 lprintf(CTDL_CRIT, "Can't get %s protocol entry: %s\n",
77 protocol, strerror(errno));
80 if (!strcmp(protocol, "udp")) {
86 s = socket(PF_INET, type, ppe->p_proto);
88 lprintf(CTDL_CRIT, "Can't create socket: %s\n", strerror(errno));
92 /* If citserver is bound to a specific IP address on the host, make
93 * sure we use that address for outbound connections.
95 memset(&egress_sin, 0, sizeof(egress_sin));
96 egress_sin.sin_family = AF_INET;
97 if (strlen(config.c_ip_addr) > 0) {
98 egress_sin.sin_addr.s_addr = inet_addr(config.c_ip_addr);
99 if (egress_sin.sin_addr.s_addr == !INADDR_ANY) {
100 egress_sin.sin_addr.s_addr = INADDR_ANY;
103 /* If this bind fails, no problem; we can still use INADDR_ANY */
104 bind(s, (struct sockaddr *)&egress_sin, sizeof(egress_sin));
107 /* Now try to connect to the remote host. */
108 if (connect(s, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
109 lprintf(CTDL_ERR, "Can't connect to %s:%s: %s\n",
110 host, service, strerror(errno));
121 * sock_read_to() - input binary data from socket, with a settable timeout.
122 * Returns the number of bytes read, or -1 for error.
124 int sock_read_to(int sock, char *buf, int bytes, int timeout)
138 retval = select(sock+1, &rfds, NULL, NULL, &tv);
140 if (FD_ISSET(sock, &rfds) == 0) { /* timed out */
141 lprintf(CTDL_ERR, "sock_read() timed out.\n");
145 rlen = read(sock, &buf[len], bytes-len);
147 lprintf(CTDL_ERR, "sock_read() failed: %s\n",
158 * sock_read() - input binary data from socket.
159 * Returns the number of bytes read, or -1 for error.
161 INLINE int sock_read(int sock, char *buf, int bytes)
163 return sock_read_to(sock, buf, bytes, CLIENT_TIMEOUT);
168 * sock_write() - send binary to server.
169 * Returns the number of bytes written, or -1 for error.
171 int sock_write(int sock, char *buf, int nbytes)
173 int bytes_written = 0;
175 while (bytes_written < nbytes) {
176 retval = write(sock, &buf[bytes_written],
177 nbytes - bytes_written);
181 bytes_written = bytes_written + retval;
183 return (bytes_written);
189 * Input string from socket - implemented in terms of sock_read()
192 int sock_gets(int sock, char *buf)
196 /* Read one character at a time.
199 if (sock_read(sock, &buf[i], 1) < 0) return(-1);
200 if (buf[i] == '\n' || i == (SIZ-1))
204 /* If we got a long line, discard characters until the newline.
207 while (buf[i] != '\n')
208 if (sock_read(sock, &buf[i], 1) < 0) return(-1);
210 /* Strip any trailing CR and LF characters.
213 while ( (strlen(buf)>0)
214 && ((buf[strlen(buf)-1]==13)
215 || (buf[strlen(buf)-1]==10)) ) {
216 buf[strlen(buf)-1] = 0;
222 * Multiline version of sock_gets() ... this is a convenience function for
223 * client side protocol implementations. It only returns the first line of
224 * a multiline response, discarding the rest.
226 int ml_sock_gets(int sock, char *buf) {
230 g = sock_gets(sock, buf);
231 if (g < 4) return(g);
232 if (buf[3] != '-') return(g);
235 g = sock_gets(sock, bigbuf);
236 if (g < 0) return(g);
237 } while ( (g >= 4) && (bigbuf[3] == '-') );
244 * sock_puts() - send line to server - implemented in terms of serv_write()
245 * Returns the number of bytes written, or -1 for error.
247 int sock_puts(int sock, char *buf)
251 i = sock_write(sock, buf, strlen(buf));
253 j = sock_write(sock, "\n", 1);