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- /* -*-C-*-
- Common library code for the GNU Emacs server and client.
-
- This file is part of GNU Emacs.
-
- Copying is permitted under those conditions described by the GNU
- General Public License.
-
- Copyright (C) 1989 Free Software Foundation, Inc.
-
- Author: Andy Norman (ange@hplb.hpl.hp.com), based on
- 'etc/server.c' and 'etc/emacsclient.c' from the 18.52 GNU
- Emacs distribution.
-
- Please mail bugs and suggestions to the author at the above address.
- */
-
- /* HISTORY
- * 11-Nov-1990 bristor@simba
- * Added EOT stuff.
- */
-
- /*
- * This file incorporates new features added by Bob Weiner <weiner@mot.com>,
- * Darrell Kindred <dkindred@cmu.edu> and Arup Mukherjee <arup@cmu.edu>.
- * Please see the note at the end of the README file for details.
- *
- * (If gnuserv came bundled with your emacs, the README file is probably
- * ../etc/gnuserv.README relative to the directory containing this file)
- */
-
- static char rcsid [] = "$Header: gnuslib.c,v 2.4 95/02/16 11:57:37 arup alpha $";
-
- #include "gnuserv.h"
-
- #ifdef SYSV_IPC
- static int connect_to_ipc_server();
- #endif
- #ifdef UNIX_DOMAIN_SOCKETS
- static int connect_to_unix_server();
- #endif
- #ifdef INTERNET_DOMAIN_SOCKETS
- static int connect_to_internet_server();
- #endif
-
- /* On some systems, e.g. DGUX, inet_addr returns a 'struct in_addr'. */
- #ifdef HAVE_BROKEN_INET_ADDR
- # define IN_ADDR struct in_addr
- # define NUMERIC_ADDR_ERROR (numeric_addr.s_addr == -1)
- #else
- # if (LONGBITS > 32)
- # define IN_ADDR unsigned int
- # else
- # define IN_ADDR unsigned long
- # endif
- # define NUMERIC_ADDR_ERROR (numeric_addr == (IN_ADDR) -1)
- #endif
-
- char *progname = NULL;
-
- int make_connection(hostarg, portarg, s)
- char *hostarg;
- int portarg;
- int *s;
- {
- #ifdef INTERNET_DOMAIN_SOCKETS
- char localhost[HOSTNAMSZ];
- char *ptr;
- if (hostarg == NULL)
- hostarg = getenv("GNU_HOST");
- if (portarg == 0 && (ptr=getenv("GNU_PORT")) != NULL)
- portarg = atoi(ptr);
- #endif
-
- if (hostarg != NULL) {
- /* hostname was given explicitly, via cmd line arg or GNU_HOST,
- * so obey it. */
- #ifdef UNIX_DOMAIN_SOCKETS
- if (!strcmp(hostarg, "unix")) {
- *s = connect_to_unix_server();
- return (int) CONN_UNIX;
- }
- #endif /* UNIX_DOMAIN_SOCKETS */
- #ifdef INTERNET_DOMAIN_SOCKETS
- *s = connect_to_internet_server(hostarg, portarg);
- return (int) CONN_INTERNET;
- #endif
- #ifdef SYSV_IPC
- return -1; /* hostarg should always be NULL for SYSV_IPC */
- #endif
- } else {
- /* no hostname given. Use unix-domain/sysv-ipc, or
- * internet-domain connection to local host if they're not available. */
- #ifdef UNIX_DOMAIN_SOCKETS
- *s = connect_to_unix_server();
- return (int) CONN_UNIX;
- #endif
- #ifdef SYSV_IPC
- *s = connect_to_ipc_server();
- return (int) CONN_IPC;
- #endif
- #ifdef INTERNET_DOMAIN_SOCKETS
- gethostname(localhost,HOSTNAMSZ); /* use this host by default */
- *s = connect_to_internet_server(localhost, portarg);
- return (int) CONN_INTERNET;
- #endif
- }
- }
-
- #ifdef SYSV_IPC
- /*
- connect_to_ipc_server -- establish connection with server process via SYSV IPC
- Returns msqid for server if successful.
- */
- static int connect_to_ipc_server()
- {
- int s; /* connected msqid */
- key_t key; /* message key */
- char buf[GSERV_BUFSZ+1]; /* buffer for filename */
-
- sprintf(buf,"/tmp/gsrv%d",(int)geteuid());
- creat(buf,0600);
- if ((key = ftok(buf,1)) == -1) {
- perror(progname);
- fprintf(stderr, "%s: unable to get ipc key from %s\n",
- progname, buf);
- exit(1);
- }
-
- if ((s = msgget(key,0600)) == -1) {
- perror(progname);
- fprintf(stderr,"%s: unable to access msg queue\n",progname);
- exit(1);
- }; /* if */
-
- return(s);
-
- } /* connect_to_ipc_server */
-
-
- /*
- disconnect_from_ipc_server -- inform the server that sending has finished,
- and wait for its reply.
- */
- void disconnect_from_ipc_server(s,msgp,echo)
- int s;
- struct msgbuf *msgp;
- int echo;
- {
- int len; /* length of received message */
-
- send_string(s,EOT_STR); /* EOT terminates this message */
- msgp->mtype = 1;
-
- if(msgsnd(s,msgp,strlen(msgp->mtext)+1,0) < 0) {
- perror(progname);
- fprintf(stderr,"%s: unable to send message to server\n",progname);
- exit(1);
- }; /* if */
-
- if((len = msgrcv(s,msgp,GSERV_BUFSZ,getpid(),0)) < 0) {
- perror(progname);
- fprintf(stderr,"%s: unable to receive message from server\n",progname);
- exit(1);
- }; /* if */
-
- if (echo) {
- msgp->mtext[len] = '\0'; /* string terminate message */
- fputs(msgp->mtext, stdout);
- if (msgp->mtext[len-1] != '\n') putchar ('\n');
- }; /* if */
-
- } /* disconnect_from_ipc_server */
- #endif /* SYSV_IPC */
-
-
- #if defined(INTERNET_DOMAIN_SOCKETS) || defined(UNIX_DOMAIN_SOCKETS)
- /*
- send_string -- send string to socket.
- */
- void send_string(s,msg)
- int s;
- char *msg;
- {
- #if 0
- if (send(s,msg,strlen(msg),0) < 0) {
- perror(progname);
- fprintf(stderr,"%s: unable to send\n",progname);
- exit(1);
- }; /* if */
- #else
- int len, left=strlen(msg);
- while (left > 0) {
- if ((len=write(s,msg,min2(left,GSERV_BUFSZ))) < 0) {
- perror(progname);
- fprintf(stderr,"%s: unable to send\n",progname);
- exit(1);
- }; /* if */
- left -= len;
- msg += len;
- }; /* while */
- #endif
- } /* send_string */
- #endif /* INTERNET_DOMAIN_SOCKETS || UNIX_DOMAIN_SOCKETS */
-
-
- #ifdef UNIX_DOMAIN_SOCKETS
- /*
- connect_to_unix_server -- establish connection with server process via a unix-
- domain socket. Returns socket descriptor for server
- if successful.
- */
- static int connect_to_unix_server()
- {
- int s; /* connected socket descriptor */
- struct sockaddr_un server; /* for unix connections */
-
- if ((s = socket(AF_UNIX,SOCK_STREAM,0)) < 0) {
- perror(progname);
- fprintf(stderr,"%s: unable to create socket\n",progname);
- exit(1);
- }; /* if */
-
- server.sun_family = AF_UNIX;
- #ifdef HIDE_UNIX_SOCKET
- sprintf(server.sun_path,"/tmp/gsrvdir%d/gsrv",(int)geteuid());
- #else /* HIDE_UNIX_SOCKET */
- sprintf(server.sun_path,"/tmp/gsrv%d",(int)geteuid());
- #endif /* HIDE_UNIX_SOCKET */
- if (connect(s,(struct sockaddr *)&server,strlen(server.sun_path)+2) < 0) {
- perror(progname);
- fprintf(stderr,"%s: unable to connect to local\n",progname);
- exit(1);
- }; /* if */
-
- return(s);
-
- } /* connect_to_unix_server */
- #endif /* UNIX_DOMAIN_SOCKETS */
-
-
- #ifdef INTERNET_DOMAIN_SOCKETS
- /*
- internet_addr -- return the internet addr of the hostname or
- internet address passed. Return -1 on error.
- */
- int internet_addr(host)
- char *host;
- {
- struct hostent *hp; /* pointer to host info for remote host */
- IN_ADDR numeric_addr; /* host address */
-
- numeric_addr = inet_addr(host);
- if (!NUMERIC_ADDR_ERROR)
- return numeric_addr;
- else if ((hp = gethostbyname(host)) != NULL)
- return ((struct in_addr *)(hp->h_addr))->s_addr;
- else
- return -1;
-
- } /* internet_addr */
-
- #ifdef AUTH_MAGIC_COOKIE
- # include <X11/X.h>
- # include <X11/Xauth.h>
-
- static Xauth *server_xauth = NULL;
- #endif
-
- /*
- connect_to_internet_server -- establish connection with server process via
- an internet domain socket. Returns socket
- descriptor for server if successful.
- */
- static int connect_to_internet_server(serverhost,port)
- char *serverhost;
- u_short port;
- {
- int s; /* connected socket descriptor */
- struct servent *sp; /* pointer to service information */
- struct sockaddr_in peeraddr_in; /* for peer socket address */
- char buf[512]; /* temporary buffer */
-
- /* clear out address structures */
- bzero((char *)&peeraddr_in,sizeof(struct sockaddr_in));
-
- /* Set up the peer address to which we will connect. */
- peeraddr_in.sin_family = AF_INET;
-
- /* look up the server host's internet address */
- if ((peeraddr_in.sin_addr.s_addr = internet_addr(serverhost)) == -1) {
- fprintf(stderr,"%s: unable to find %s in /etc/hosts or from YP\n",
- progname,serverhost);
- exit(1);
- }; /* if */
-
- if (port == 0) {
- if ((sp = getservbyname ("gnuserv","tcp")) == NULL)
- peeraddr_in.sin_port = htons(DEFAULT_PORT+getuid());
- else
- peeraddr_in.sin_port = sp->s_port;
- } /* if */
- else
- peeraddr_in.sin_port = htons(port);
-
- /* Create the socket. */
- if ((s = socket (AF_INET,SOCK_STREAM, 0))== -1) {
- perror(progname);
- fprintf(stderr,"%s: unable to create socket\n",progname);
- exit(1);
- }; /* if */
-
- /* Try to connect to the remote server at the address
- * which was just built into peeraddr.
- */
- if (connect(s, (struct sockaddr *)&peeraddr_in,
- sizeof(struct sockaddr_in)) == -1) {
- perror(progname);
- fprintf(stderr, "%s: unable to connect to remote\n",progname);
- exit(1);
- }; /* if */
-
- #ifdef AUTH_MAGIC_COOKIE
-
- /* send credentials using MIT-MAGIC-COOKIE-1 protocol */
-
- server_xauth =
- XauGetAuthByAddr(FamilyInternet,
- sizeof(peeraddr_in.sin_addr.s_addr),
- (char *) &peeraddr_in.sin_addr.s_addr,
- strlen(MCOOKIE_SCREEN), MCOOKIE_SCREEN,
- strlen(MCOOKIE_X_NAME), MCOOKIE_X_NAME);
-
- if (server_xauth && server_xauth->data) {
- sprintf(buf, "%s\n%d\n", MCOOKIE_NAME, server_xauth->data_length);
- write (s, buf, strlen(buf));
- write (s, server_xauth->data, server_xauth->data_length);
-
- return (s);
- }
-
- #endif /* AUTH_MAGIC_COOKIE */
-
- sprintf (buf, "%s\n", DEFAUTH_NAME);
- write (s, buf, strlen(buf));
-
- return(s);
-
- } /* connect_to_internet_server */
- #endif /* INTERNET_DOMAIN_SOCKETS */
-
-
- #if defined(INTERNET_DOMAIN_SOCKETS) || defined(UNIX_DOMAIN_SOCKETS)
- /*
- disconnect_from_server -- inform the server that sending has finished, and wait for
- its reply.
- */
- void disconnect_from_server(s,echo)
- int s;
- int echo;
- {
- #if 0
- char buffer[REPLYSIZ+1];
- #else
- char buffer[GSERV_BUFSZ+1];
- #endif
- int add_newline = 1;
- int length;
-
- send_string(s,EOT_STR); /* make sure server gets string */
-
- #ifndef linux
- /*
- * shutdown is completely hozed under linux. If s is a unix domain socket,
- * you'll get EOPNOTSUPP back from it. If s is an internet socket, you get
- * a broken pipe when you try to read a bit later. The latter
- * problem is fixed for linux versions >= 1.1.46, but the problem
- * with unix sockets persists. Sigh.
- */
-
- if (shutdown(s,1) == -1) {
- perror(progname);
- fprintf(stderr, "%s: unable to shutdown socket\n",progname);
- exit(1);
- }; /* if */
- #endif
-
- #if 0
- while((length = recv(s,buffer,REPLYSIZ,0)) > 0) {
- buffer[length] = '\0';
- if (echo) fputs(buffer,stdout);
- add_newline = (buffer[length-1] != '\n');
- }; /* while */
- #else
- while ((length = read(s,buffer,GSERV_BUFSZ)) > 0) {
- buffer[length] = '\0';
- if (echo) {
- fputs(buffer,stdout);
- add_newline = (buffer[length-1] != '\n');
- }; /* if */
- }; /* while */
- #endif
-
- if (echo && add_newline) putchar('\n');
-
- if(length < 0) {
- perror(progname);
- fprintf(stderr,"%s: unable to read the reply from the server\n",progname);
- exit(1);
- }; /* if */
-
- } /* disconnect_from_server */
- #endif /* INTERNET_DOMAIN_SOCKETS || UNIX_DOMAIN_SOCKETS */
-