4 * Client-side IPC functions
10 #define DEFAULT_HOST UDS
11 #define DEFAULT_PORT "citadel"
19 #include <sys/types.h>
20 #include <sys/socket.h>
21 #include <netinet/in.h>
22 #include <arpa/inet.h>
30 #include "citadel_decls.h"
38 * If server_is_local is set to nonzero, the client assumes that it is running
39 * on the same computer as the server. Several things happen when this is
40 * the case, including the ability to map a specific tty to a particular login
41 * session in the "<W>ho is online" listing, the ability to run external
42 * programs, and the ability to download files directly off the disk without
43 * having to first fetch them from the server.
44 * Set the flag to 1 if this IPC is local (as is the case with pipes, or a
45 * network session to the local machine) or 0 if the server is executing on
48 int server_is_local = 0;
51 #define INADDR_NONE 0xffffffff
56 void connection_died(void) {
58 "Your connection to this Citadel server is broken.\n"
59 "Please re-connect and log in again.\n");
64 void timeout(int signum)
66 printf("\rConnection timed out.\n");
71 int connectsock(char *host, char *service, char *protocol)
76 struct sockaddr_in sin;
79 memset(&sin, 0, sizeof(sin));
80 sin.sin_family = AF_INET;
82 pse = getservbyname(service, protocol);
84 sin.sin_port = pse->s_port;
85 } else if ((sin.sin_port = htons((u_short) atoi(service))) == 0) {
86 fprintf(stderr, "Can't get %s service entry: %s\n",
87 service, strerror(errno));
90 phe = gethostbyname(host);
92 memcpy(&sin.sin_addr, phe->h_addr, phe->h_length);
93 } else if ((sin.sin_addr.s_addr = inet_addr(host)) == INADDR_NONE) {
94 fprintf(stderr, "Can't get %s host entry: %s\n",
95 host, strerror(errno));
98 if ((ppe = getprotobyname(protocol)) == 0) {
99 fprintf(stderr, "Can't get %s protocol entry: %s\n",
100 protocol, strerror(errno));
103 if (!strcmp(protocol, "udp")) {
109 s = socket(PF_INET, type, ppe->p_proto);
111 fprintf(stderr, "Can't create socket: %s\n", strerror(errno));
114 signal(SIGALRM, timeout);
117 if (connect(s, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
118 fprintf(stderr, "can't connect to %s.%s: %s\n",
119 host, service, strerror(errno));
123 signal(SIGALRM, SIG_IGN);
128 int uds_connectsock(char *sockpath)
130 struct sockaddr_un addr;
134 memset(&addr, 0, sizeof(addr));
135 addr.sun_family = AF_UNIX;
136 safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
138 s = socket(AF_UNIX, SOCK_STREAM, 0);
140 fprintf(stderr, "Can't create socket: %s\n",
145 if (connect(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
146 fprintf(stderr, "can't connect: %s\n",
156 * convert service and host entries into a six-byte numeric in the format
157 * expected by a SOCKS v4 server
159 void numericize(char *buf, char *host, char *service, char *protocol)
163 struct sockaddr_in sin;
165 memset(&sin, 0, sizeof(sin));
166 sin.sin_family = AF_INET;
168 pse = getservbyname(service, protocol);
170 sin.sin_port = pse->s_port;
171 } else if ((sin.sin_port = htons((u_short) atoi(service))) == 0) {
172 fprintf(stderr, "Can't get %s service entry: %s\n",
173 service, strerror(errno));
176 buf[1] = (((sin.sin_port) & 0xFF00) >> 8);
177 buf[0] = ((sin.sin_port) & 0x00FF);
179 phe = gethostbyname(host);
181 memcpy(&sin.sin_addr, phe->h_addr, phe->h_length);
182 } else if ((sin.sin_addr.s_addr = inet_addr(host)) == INADDR_NONE) {
183 fprintf(stderr, "Can't get %s host entry: %s\n",
184 host, strerror(errno));
187 buf[5] = ((sin.sin_addr.s_addr) & 0xFF000000) >> 24;
188 buf[4] = ((sin.sin_addr.s_addr) & 0x00FF0000) >> 16;
189 buf[3] = ((sin.sin_addr.s_addr) & 0x0000FF00) >> 8;
190 buf[2] = ((sin.sin_addr.s_addr) & 0x000000FF);
194 * input binary data from socket
196 void serv_read(char *buf, int bytes)
201 while (len < bytes) {
202 rlen = read(serv_sock, &buf[len], bytes - len);
213 * send binary to server
215 void serv_write(char *buf, int nbytes)
217 int bytes_written = 0;
219 while (bytes_written < nbytes) {
220 retval = write(serv_sock, &buf[bytes_written],
221 nbytes - bytes_written);
226 bytes_written = bytes_written + retval;
233 * input string from socket - implemented in terms of serv_read()
235 void serv_gets(char *buf)
239 /* Read one character at a time.
242 serv_read(&buf[i], 1);
243 if (buf[i] == '\n' || i == (SIZ-1))
247 /* If we got a long line, discard characters until the newline.
250 while (buf[i] != '\n')
251 serv_read(&buf[i], 1);
253 /* Strip the trailing newline.
260 * send line to server - implemented in terms of serv_write()
262 void serv_puts(char *buf)
264 /* printf("< %s\n", buf); */
265 serv_write(buf, strlen(buf));
273 void attach_to_server(int argc, char **argv, char *hostbuf, char *portbuf)
285 strcpy(cithost, DEFAULT_HOST); /* default host */
286 strcpy(citport, DEFAULT_PORT); /* default port */
287 strcpy(socks4, ""); /* SOCKS v4 server */
290 for (a = 0; a < argc; ++a) {
293 } else if (!strcmp(argv[a], "-s")) {
294 strcpy(socks4, argv[++a]);
295 } else if (host_copied == 0) {
297 strcpy(cithost, argv[a]);
298 } else if (port_copied == 0) {
300 strcpy(citport, argv[a]);
304 fprintf(stderr,"%s: usage: ",argv[0]);
305 fprintf(stderr,"%s [host] [port] ",argv[0]);
306 fprintf(stderr,"[-s socks_server]\n");
312 if ((!strcmp(cithost, "localhost"))
313 || (!strcmp(cithost, "127.0.0.1")))
316 /* If we're using a unix domain socket we can do a bunch of stuff */
317 if (!strcmp(cithost, UDS)) {
318 sprintf(sockpath, "citadel.socket");
319 serv_sock = uds_connectsock(sockpath);
320 if (hostbuf != NULL) strcpy(hostbuf, cithost);
321 if (portbuf != NULL) strcpy(portbuf, sockpath);
325 /* if not using a SOCKS proxy server, make the connection directly */
326 if (strlen(socks4) == 0) {
327 serv_sock = connectsock(cithost, citport, "tcp");
328 if (hostbuf != NULL) strcpy(hostbuf, cithost);
329 if (portbuf != NULL) strcpy(portbuf, citport);
332 /* if using SOCKS, connect first to the proxy... */
333 serv_sock = connectsock(socks4, "1080", "tcp");
334 printf("Connected to SOCKS proxy at %s.\n", socks4);
335 printf("Attaching to server...\r");
338 snprintf(buf, sizeof buf, "%c%c",
340 1); /* method = connect */
343 numericize(buf, cithost, citport, "tcp");
344 serv_write(buf, 6); /* port and address */
346 p = (struct passwd *) getpwuid(getuid());
347 serv_write(p->pw_name, strlen(p->pw_name) + 1);
350 serv_read(buf, 8); /* get response */
353 printf("SOCKS server denied this proxy request.\n");
359 * return the file descriptor of the server socket so we can select() on it.
368 * return one character