2 Common library code for the GNU Emacs server and client.
4 This file is part of GNU Emacs.
6 Copying is permitted under those conditions described by the GNU
7 General Public License.
9 Copyright (C) 1989 Free Software Foundation, Inc.
11 Author: Andy Norman (ange@hplb.hpl.hp.com), based on
12 'etc/server.c' and 'etc/emacsclient.c' from the 18.52 GNU
15 Please mail bugs and suggestions to the author at the above address.
19 * 11-Nov-1990 bristor@simba
24 * This file incorporates new features added by Bob Weiner <weiner@mot.com>,
25 * Darrell Kindred <dkindred@cmu.edu> and Arup Mukherjee <arup@cmu.edu>.
26 * Please see the note at the end of the README file for details.
28 * (If gnuserv came bundled with your emacs, the README file is probably
29 * ../etc/gnuserv.README relative to the directory containing this file)
33 static char rcsid [] = "!Header: gnuslib.c,v 2.4 95/02/16 11:57:37 arup alpha !";
40 static int connect_to_ipc_server (void);
42 #ifdef UNIX_DOMAIN_SOCKETS
43 static int connect_to_unix_server (void);
45 #ifdef INTERNET_DOMAIN_SOCKETS
46 static int connect_to_internet_server (char *serverhost, u_short port);
49 /* On some systems, e.g. DGUX, inet_addr returns a 'struct in_addr'. */
50 #ifdef HAVE_BROKEN_INET_ADDR
51 # define IN_ADDR struct in_addr
52 # define NUMERIC_ADDR_ERROR (numeric_addr.s_addr == -1)
55 # define IN_ADDR unsigned int
57 # define IN_ADDR unsigned long
59 # define NUMERIC_ADDR_ERROR (numeric_addr == (IN_ADDR) -1)
64 #include <sys/types.h>
68 #endif /* HAVE_UNISTD_H */
71 #endif /* HAVE_STRING_H */
73 #include <arpa/inet.h>
77 char *progname = NULL;
79 int make_connection(hostarg, portarg, s)
84 #ifdef INTERNET_DOMAIN_SOCKETS
87 hostarg = getenv("GNU_HOST");
88 if (portarg == 0 && (ptr=getenv("GNU_PORT")) != NULL)
92 if (hostarg != NULL) {
93 /* hostname was given explicitly, via cmd line arg or GNU_HOST,
95 #ifdef UNIX_DOMAIN_SOCKETS
96 if (!strcmp(hostarg, "unix")) {
97 *s = connect_to_unix_server();
98 return (int) CONN_UNIX;
100 #endif /* UNIX_DOMAIN_SOCKETS */
101 #ifdef INTERNET_DOMAIN_SOCKETS
102 *s = connect_to_internet_server(hostarg, portarg);
103 return (int) CONN_INTERNET;
106 return -1; /* hostarg should always be NULL for SYSV_IPC */
109 /* no hostname given. Use unix-domain/sysv-ipc, or
110 * internet-domain connection to local host if they're not available. */
111 #if defined(UNIX_DOMAIN_SOCKETS)
112 *s = connect_to_unix_server();
113 return (int) CONN_UNIX;
114 #elif defined(SYSV_IPC)
115 *s = connect_to_ipc_server();
116 return (int) CONN_IPC;
117 #elif defined(INTERNET_DOMAIN_SOCKETS)
119 char localhost[HOSTNAMSZ];
120 gethostname(localhost,HOSTNAMSZ); /* use this host by default */
121 *s = connect_to_internet_server(localhost, portarg);
122 return (int) CONN_INTERNET;
124 #endif /* IPC type */
130 connect_to_ipc_server -- establish connection with server process via SYSV IPC
131 Returns msqid for server if successful.
133 static int connect_to_ipc_server (void)
135 int s; /* connected msqid */
136 key_t key; /* message key */
137 char buf[GSERV_BUFSZ+1]; /* buffer for filename */
139 sprintf(buf,"%s/gsrv%d",tmpdir,(int)geteuid());
141 if ((key = ftok(buf,1)) == -1) {
143 fprintf(stderr, "%s: unable to get ipc key from %s\n",
148 if ((s = msgget(key,0600)) == -1) {
150 fprintf(stderr,"%s: unable to access msg queue\n",progname);
156 } /* connect_to_ipc_server */
160 disconnect_from_ipc_server -- inform the server that sending has finished,
161 and wait for its reply.
163 void disconnect_from_ipc_server(s,msgp,echo)
168 int len; /* length of received message */
170 send_string(s,EOT_STR); /* EOT terminates this message */
173 if(msgsnd(s,msgp,strlen(msgp->mtext)+1,0) < 0) {
175 fprintf(stderr,"%s: unable to send message to server\n",progname);
179 if((len = msgrcv(s,msgp,GSERV_BUFSZ,getpid(),0)) < 0) {
181 fprintf(stderr,"%s: unable to receive message from server\n",progname);
186 msgp->mtext[len] = '\0'; /* string terminate message */
187 fputs(msgp->mtext, stdout);
188 if (msgp->mtext[len-1] != '\n') putchar ('\n');
191 } /* disconnect_from_ipc_server */
192 #endif /* SYSV_IPC */
195 #if defined(INTERNET_DOMAIN_SOCKETS) || defined(UNIX_DOMAIN_SOCKETS)
197 send_string -- send string to socket.
199 void send_string(s,msg)
204 if (send(s,msg,strlen(msg),0) < 0) {
206 fprintf(stderr,"%s: unable to send\n",progname);
210 int len, left=strlen(msg);
212 if ((len=write(s,msg,min2(left,GSERV_BUFSZ))) < 0) {
213 /* XEmacs addition: robertl@arnet.com */
214 if (errno == EPIPE) {
218 fprintf(stderr,"%s: unable to send\n",progname);
228 read_line -- read a \n terminated line from a socket
230 int read_line(int s, char *dest)
234 char buffer[GSERV_BUFSZ+1];
236 while ((length=read(s,buffer+offset,1)>0) && buffer[offset]!='\n'
237 && buffer[offset] != EOT_CHR) {
239 if (offset >= GSERV_BUFSZ)
242 buffer[offset] = '\0';
246 #endif /* INTERNET_DOMAIN_SOCKETS || UNIX_DOMAIN_SOCKETS */
249 #ifdef UNIX_DOMAIN_SOCKETS
251 connect_to_unix_server -- establish connection with server process via a unix-
252 domain socket. Returns socket descriptor for server
255 static int connect_to_unix_server (void)
257 int s; /* connected socket descriptor */
258 struct sockaddr_un server; /* for unix connections */
260 if ((s = socket(AF_UNIX,SOCK_STREAM,0)) < 0) {
262 fprintf(stderr,"%s: unable to create socket\n",progname);
266 server.sun_family = AF_UNIX;
267 #ifdef HIDE_UNIX_SOCKET
268 sprintf(server.sun_path,"%s/gsrvdir%d/gsrv",tmpdir,(int)geteuid());
269 #else /* HIDE_UNIX_SOCKET */
270 sprintf(server.sun_path,"%s/gsrv%d",tmpdir,(int)geteuid());
271 #endif /* HIDE_UNIX_SOCKET */
272 if (connect(s,(struct sockaddr *)&server,strlen(server.sun_path)+2) < 0) {
274 fprintf(stderr,"%s: unable to connect to local\n",progname);
280 } /* connect_to_unix_server */
281 #endif /* UNIX_DOMAIN_SOCKETS */
284 #ifdef INTERNET_DOMAIN_SOCKETS
286 internet_addr -- return the internet addr of the hostname or
287 internet address passed. Return -1 on error.
289 int internet_addr(host)
292 struct hostent *hp; /* pointer to host info for remote host */
293 IN_ADDR numeric_addr; /* host address */
295 numeric_addr = inet_addr(host);
296 if (!NUMERIC_ADDR_ERROR)
298 else if ((hp = gethostbyname(host)) != NULL)
299 return ((struct in_addr *)(hp->h_addr))->s_addr;
303 } /* internet_addr */
305 #ifdef AUTH_MAGIC_COOKIE
307 # include <X11/Xauth.h>
309 static Xauth *server_xauth = NULL;
313 connect_to_internet_server -- establish connection with server process via
314 an internet domain socket. Returns socket
315 descriptor for server if successful.
317 static int connect_to_internet_server (char *serverhost, u_short port)
319 int s; /* connected socket descriptor */
320 struct servent *sp; /* pointer to service information */
321 struct sockaddr_in peeraddr_in; /* for peer socket address */
322 char buf[512]; /* temporary buffer */
324 /* clear out address structures */
325 memset((char *)&peeraddr_in,0,sizeof(struct sockaddr_in));
327 /* Set up the peer address to which we will connect. */
328 peeraddr_in.sin_family = AF_INET;
330 /* look up the server host's internet address */
331 if ((peeraddr_in.sin_addr.s_addr = internet_addr(serverhost)) == -1) {
332 fprintf(stderr,"%s: unable to find %s in /etc/hosts or from YP\n",
333 progname,serverhost);
338 if ((sp = getservbyname ("gnuserv","tcp")) == NULL)
339 peeraddr_in.sin_port = htons(DEFAULT_PORT+getuid());
341 peeraddr_in.sin_port = sp->s_port;
344 peeraddr_in.sin_port = htons(port);
346 /* Create the socket. */
347 if ((s = socket (AF_INET,SOCK_STREAM, 0))== -1) {
349 fprintf(stderr,"%s: unable to create socket\n",progname);
353 /* Try to connect to the remote server at the address
354 * which was just built into peeraddr.
356 if (connect(s, (struct sockaddr *)&peeraddr_in,
357 sizeof(struct sockaddr_in)) == -1) {
359 fprintf(stderr, "%s: unable to connect to remote\n",progname);
363 #ifdef AUTH_MAGIC_COOKIE
365 /* send credentials using MIT-MAGIC-COOKIE-1 protocol */
368 XauGetAuthByAddr(FamilyInternet,
369 sizeof(peeraddr_in.sin_addr.s_addr),
370 (char *) &peeraddr_in.sin_addr.s_addr,
371 strlen(MCOOKIE_SCREEN), MCOOKIE_SCREEN,
372 strlen(MCOOKIE_X_NAME), MCOOKIE_X_NAME);
374 if (server_xauth && server_xauth->data) {
375 sprintf(buf, "%s\n%d\n", MCOOKIE_NAME, server_xauth->data_length);
376 write (s, buf, strlen(buf));
377 write (s, server_xauth->data, server_xauth->data_length);
382 #endif /* AUTH_MAGIC_COOKIE */
384 sprintf (buf, "%s\n", DEFAUTH_NAME);
385 write (s, buf, strlen(buf));
389 } /* connect_to_internet_server */
390 #endif /* INTERNET_DOMAIN_SOCKETS */
393 #if defined(INTERNET_DOMAIN_SOCKETS) || defined(UNIX_DOMAIN_SOCKETS)
395 disconnect_from_server -- inform the server that sending has finished, and wait for
398 void disconnect_from_server(s,echo)
403 char buffer[REPLYSIZ+1];
405 char buffer[GSERV_BUFSZ+1];
410 send_string(s,EOT_STR); /* make sure server gets string */
412 #if !defined (linux) && !defined (_SCO_DS)
414 * shutdown is completely hozed under linux. If s is a unix domain socket,
415 * you'll get EOPNOTSUPP back from it. If s is an internet socket, you get
416 * a broken pipe when you try to read a bit later. The latter
417 * problem is fixed for linux versions >= 1.1.46, but the problem
418 * with unix sockets persists. Sigh.
421 if (shutdown(s,1) == -1) {
423 fprintf(stderr, "%s: unable to shutdown socket\n",progname);
429 while((length = recv(s,buffer,REPLYSIZ,0)) > 0) {
430 buffer[length] = '\0';
431 if (echo) fputs(buffer,stdout);
432 add_newline = (buffer[length-1] != '\n');
435 while ((length = read(s,buffer,GSERV_BUFSZ)) > 0 ||
436 (length == -1 && errno == EINTR)) {
438 buffer[length] = '\0';
440 fputs(buffer,stdout);
441 add_newline = (buffer[length-1] != '\n');
447 if (echo && add_newline) putchar('\n');
451 fprintf(stderr,"%s: unable to read the reply from the server\n",progname);
455 } /* disconnect_from_server */
456 #endif /* INTERNET_DOMAIN_SOCKETS || UNIX_DOMAIN_SOCKETS */