mirror of
https://git.savannah.gnu.org/git/emacs.git
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9f637eea61
(main): if $LOGNAME or $USER exist and differ from our euid, look for a socket based on the UID associated with the name.
642 lines
14 KiB
C
642 lines
14 KiB
C
/* Client process that communicates with GNU Emacs acting as server.
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Copyright (C) 1986, 1987, 1994, 1999, 2000 Free Software Foundation, Inc.
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This file is part of GNU Emacs.
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GNU Emacs is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Emacs is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Emacs; see the file COPYING. If not, write to
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the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#define NO_SHORTNAMES
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#include <../src/config.h>
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#undef signal
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#include <stdio.h>
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#include <getopt.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef VMS
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# include "vms-pwd.h"
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#else
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# include <pwd.h>
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#endif /* not VMS */
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char *getenv (), *getwd ();
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char *getcwd ();
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/* This is defined with -D from the compilation command,
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which extracts it from ../lisp/version.el. */
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#ifndef VERSION
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#define VERSION "unspecified"
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#endif
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/* Name used to invoke this program. */
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char *progname;
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/* Nonzero means don't wait for a response from Emacs. --no-wait. */
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int nowait = 0;
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void print_help_and_exit ();
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struct option longopts[] =
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{
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{ "no-wait", no_argument, NULL, 'n' },
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{ "help", no_argument, NULL, 'H' },
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{ "version", no_argument, NULL, 'V' },
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{ "alternate-editor",required_argument, NULL, 'a' },
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{ 0 }
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};
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const char * alternate_editor = NULL;
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/* Decode the options from argv and argc.
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The global variable `optind' will say how many arguments we used up. */
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void
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decode_options (argc, argv)
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int argc;
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char **argv;
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{
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while (1)
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{
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int opt = getopt_long (argc, argv,
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"VHna:", longopts, 0);
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if (opt == EOF)
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break;
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alternate_editor = getenv ("ALTERNATE_EDITOR");
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switch (opt)
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{
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case 0:
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/* If getopt returns 0, then it has already processed a
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long-named option. We should do nothing. */
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break;
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case 'a':
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alternate_editor = optarg;
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break;
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case 'n':
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nowait = 1;
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break;
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case 'V':
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fprintf (stderr, "emacsclient %s\n", VERSION);
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exit (1);
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break;
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case 'H':
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default:
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print_help_and_exit ();
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}
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}
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}
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void
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print_help_and_exit ()
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{
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fprintf (stderr,
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"Usage: %s [-a ALTERNATE-EDITOR] [-n] [--no-wait] [+LINENUMBER] FILENAME\n",
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progname);
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fprintf (stderr,
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"Or %s --version\n",
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progname);
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fprintf (stderr,
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"Report bugs to bug-gnu-emacs@gnu.org.\n");
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exit (1);
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}
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/* Return a copy of NAME, inserting a &
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before each &, each space, and any initial -.
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Change spaces to underscores, too, so that the
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return value never contains a space. */
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char *
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quote_file_name (name)
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char *name;
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{
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char *copy = (char *) malloc (strlen (name) * 2 + 1);
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char *p, *q;
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p = name;
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q = copy;
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while (*p)
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{
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if (*p == ' ')
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{
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*q++ = '&';
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*q++ = '_';
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p++;
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}
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else
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{
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if (*p == '&' || (*p == '-' && p == name))
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*q++ = '&';
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*q++ = *p++;
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}
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}
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*q++ = 0;
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return copy;
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}
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/* Like malloc but get fatal error if memory is exhausted. */
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long *
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xmalloc (size)
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unsigned int size;
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{
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long *result = (long *) malloc (size);
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if (result == NULL)
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{
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perror ("malloc");
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exit (1);
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}
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return result;
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}
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/*
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Try to run a different command, or --if no alternate editor is
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defined-- exit with an errorcode.
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*/
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fail (argc, argv)
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int argc;
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char **argv;
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{
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if (alternate_editor)
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{
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int i = optind -1 ;
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execvp (alternate_editor, argv + i);
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}
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else
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{
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exit (1);
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}
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}
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#if !defined (HAVE_SOCKETS) && !defined (HAVE_SYSVIPC)
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main (argc, argv)
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int argc;
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char **argv;
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{
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fprintf (stderr, "%s: Sorry, the Emacs server is supported only\n",
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argv[0]);
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fprintf (stderr, "on systems with Berkeley sockets or System V IPC.\n");
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fail (argc, argv);
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}
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#else /* HAVE_SOCKETS or HAVE_SYSVIPC */
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#if defined (HAVE_SOCKETS) && ! defined (NO_SOCKETS_IN_FILE_SYSTEM)
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/* BSD code is very different from SYSV IPC code */
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <sys/stat.h>
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#include <errno.h>
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extern char *strerror ();
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extern int errno;
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/* Three possibilities:
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2 - can't be `stat'ed (sets errno)
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1 - isn't owned by us
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0 - success: none of the above */
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static int
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socket_status (socket_name)
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char *socket_name;
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{
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struct stat statbfr;
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if (stat (socket_name, &statbfr) == -1)
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return 2;
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if (statbfr.st_uid != geteuid ())
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return 1;
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return 0;
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}
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int
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main (argc, argv)
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int argc;
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char **argv;
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{
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char *system_name;
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int system_name_length;
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int s, i;
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FILE *out, *in;
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struct sockaddr_un server;
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char *homedir, *cwd, *str;
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char string[BUFSIZ];
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progname = argv[0];
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/* Process options. */
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decode_options (argc, argv);
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if (argc - optind < 1)
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print_help_and_exit ();
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/*
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* Open up an AF_UNIX socket in this person's home directory
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*/
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if ((s = socket (AF_UNIX, SOCK_STREAM, 0)) < 0)
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{
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fprintf (stderr, "%s: ", argv[0]);
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perror ("socket");
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fail (argc, argv);
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}
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server.sun_family = AF_UNIX;
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{
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system_name_length = 32;
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while (1)
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{
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system_name = (char *) xmalloc (system_name_length + 1);
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/* system_name must be null-terminated string. */
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system_name[system_name_length] = '\0';
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if (gethostname (system_name, system_name_length) == 0)
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break;
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free (system_name);
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system_name_length *= 2;
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}
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}
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#ifndef SERVER_HOME_DIR
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{
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struct stat statbfr;
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int sock_status = 0;
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sprintf (server.sun_path, "/tmp/esrv%d-%s", geteuid (), system_name);
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/* See if the socket exists, and if it's owned by us. */
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sock_status = socket_status (server.sun_path);
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if (sock_status)
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{
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/* Failing that, see if LOGNAME or USER exist and differ from
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our euid. If so, look for a socket based on the UID
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associated with the name. This is reminiscent of the logic
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that init_editfns uses to set the global Vuser_full_name. */
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char *user_name = (char *) getenv ("LOGNAME");
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if (!user_name)
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user_name = (char *) getenv ("USER");
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if (user_name)
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{
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struct passwd *pw = getpwnam (user_name);
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if (pw && (pw->pw_uid != geteuid ()))
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{
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/* We're running under su, apparently. */
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sprintf (server.sun_path, "/tmp/esrv%d-%s",
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pw->pw_uid, system_name);
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sock_status = socket_status (server.sun_path);
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}
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}
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}
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switch (sock_status)
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{
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case 1:
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/* There's a socket, but it isn't owned by us. This is OK if
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we are root. */
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if (0 != geteuid ())
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{
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fprintf (stderr, "%s: Invalid socket owner\n", argv[0]);
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fail (argc, argv);
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}
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break;
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case 2:
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/* `stat' failed */
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if (errno == ENOENT)
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fprintf (stderr,
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"%s: can't find socket; have you started the server?\n",
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argv[0]);
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else
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fprintf (stderr, "%s: can't stat %s: %s\n",
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argv[0], server.sun_path, strerror (errno));
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fail (argc, argv);
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break;
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}
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}
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#else
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if ((homedir = getenv ("HOME")) == NULL)
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{
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fprintf (stderr, "%s: No home directory\n", argv[0]);
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fail (argc, argv);
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}
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strcpy (server.sun_path, homedir);
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strcat (server.sun_path, "/.emacs-server-");
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strcat (server.sun_path, system_name);
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#endif
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if (connect (s, (struct sockaddr *) &server, strlen (server.sun_path) + 2)
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< 0)
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{
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fprintf (stderr, "%s: ", argv[0]);
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perror ("connect");
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fail (argc, argv);
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}
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/* We use the stream OUT to send our command to the server. */
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if ((out = fdopen (s, "r+")) == NULL)
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{
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fprintf (stderr, "%s: ", argv[0]);
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perror ("fdopen");
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fail (argc, argv);
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}
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/* We use the stream IN to read the response.
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We used to use just one stream for both output and input
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on the socket, but reversing direction works nonportably:
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on some systems, the output appears as the first input;
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on other systems it does not. */
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if ((in = fdopen (s, "r+")) == NULL)
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{
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fprintf (stderr, "%s: ", argv[0]);
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perror ("fdopen");
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fail (argc, argv);
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}
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#ifdef BSD_SYSTEM
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cwd = getwd (string);
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#else
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cwd = getcwd (string, sizeof string);
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#endif
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if (cwd == 0)
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{
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/* getwd puts message in STRING if it fails. */
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fprintf (stderr, "%s: %s (%s)\n", argv[0],
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#ifdef BSD_SYSTEM
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string,
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#else
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"Cannot get current working directory",
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#endif
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strerror (errno));
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fail (argc, argv);
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}
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if (nowait)
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fprintf (out, "-nowait ");
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for (i = optind; i < argc; i++)
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{
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if (*argv[i] == '+')
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{
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char *p = argv[i] + 1;
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while (*p >= '0' && *p <= '9') p++;
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if (*p != 0)
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fprintf (out, "%s/", quote_file_name (cwd));
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}
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else if (*argv[i] != '/')
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fprintf (out, "%s/", quote_file_name (cwd));
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fprintf (out, "%s ", quote_file_name (argv[i]));
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}
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fprintf (out, "\n");
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fflush (out);
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/* Maybe wait for an answer. */
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if (nowait)
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return 0;
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printf ("Waiting for Emacs...");
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fflush (stdout);
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/* Now, wait for an answer and print any messages. On some systems,
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the first line we read will actually be the output we just sent.
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We can't predict whether that will happen, so if it does, we
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detect it by recognizing `Client: ' at the beginning. */
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while (str = fgets (string, BUFSIZ, in))
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printf ("%s", str);
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return 0;
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}
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#else /* This is the SYSV IPC section */
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#include <sys/types.h>
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#include <sys/ipc.h>
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#include <sys/msg.h>
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#include <sys/utsname.h>
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#include <stdio.h>
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#include <errno.h>
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extern int errno;
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char *getwd (), *getcwd (), *getenv ();
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struct utsname system_name;
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main (argc, argv)
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int argc;
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char **argv;
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{
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int s;
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key_t key;
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/* Size of text allocated in MSGP. */
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int size_allocated = BUFSIZ;
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/* Amount of text used in MSGP. */
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int used;
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struct msgbuf *msgp
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= (struct msgbuf *) malloc (sizeof (struct msgbuf) + size_allocated);
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struct msqid_ds * msg_st;
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char *homedir, buf[BUFSIZ];
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char gwdirb[BUFSIZ];
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char *cwd;
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char *temp;
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progname = argv[0];
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/* Process options. */
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decode_options (argc, argv);
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if (argc - optind < 1)
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print_help_and_exit ();
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/*
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* Create a message queue using ~/.emacs-server as the path for ftok
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*/
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if ((homedir = getenv ("HOME")) == NULL)
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{
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fprintf (stderr, "%s: No home directory\n", argv[0]);
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exit (1);
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}
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strcpy (buf, homedir);
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#ifndef HAVE_LONG_FILE_NAMES
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/* If file names are short, we can't fit the host name. */
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strcat (buf, "/.emacs-server");
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#else
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strcat (buf, "/.emacs-server-");
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uname (&system_name);
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strcat (buf, system_name.nodename);
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#endif
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creat (buf, 0600);
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key = ftok (buf, 1); /* unlikely to be anyone else using it */
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s = msgget (key, 0600 | IPC_CREAT);
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if (s == -1)
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{
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fprintf (stderr, "%s: ", argv[0]);
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perror ("msgget");
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exit (1);
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}
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/* Determine working dir, so we can prefix it to all the arguments. */
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#ifdef BSD_SYSTEM
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temp = getwd (gwdirb);
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#else
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temp = getcwd (gwdirb, sizeof gwdirb);
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#endif
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cwd = gwdirb;
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if (temp != 0)
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{
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/* On some systems, cwd can look like `@machine/...';
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ignore everything before the first slash in such a case. */
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while (*cwd && *cwd != '/')
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cwd++;
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strcat (cwd, "/");
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}
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else
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{
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#ifdef BSD_SYSTEM
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fprintf (stderr, "%s: %s\n", argv[0], cwd);
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#else
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fprintf (stderr, "%s: Cannot get current working directory: %s\n",
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argv[0], strerror (errno));
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#endif
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fail (argc, argv);
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}
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msgp->mtext[0] = 0;
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used = 0;
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if (nowait)
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{
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strcat (msgp->mtext, "-nowait ");
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used += 8;
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}
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argc -= optind;
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argv += optind;
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while (argc)
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{
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int need_cwd = 0;
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char *modified_arg = argv[0];
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if (*modified_arg == '+')
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{
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char *p = modified_arg + 1;
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while (*p >= '0' && *p <= '9') p++;
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if (*p != 0)
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need_cwd = 1;
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}
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else if (*modified_arg != '/')
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need_cwd = 1;
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modified_arg = quote_file_name (modified_arg);
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if (need_cwd)
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/* Overestimate in case we have to quote something in CWD. */
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used += 2 * strlen (cwd);
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used += strlen (modified_arg) + 1;
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while (used + 2 > size_allocated)
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{
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size_allocated *= 2;
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msgp = (struct msgbuf *) realloc (msgp,
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(sizeof (struct msgbuf)
|
||
+ size_allocated));
|
||
}
|
||
|
||
if (need_cwd)
|
||
strcat (msgp->mtext, quote_file_name (cwd));
|
||
|
||
strcat (msgp->mtext, modified_arg);
|
||
strcat (msgp->mtext, " ");
|
||
argv++; argc--;
|
||
}
|
||
strcat (msgp->mtext, "\n");
|
||
#ifdef HPUX /* HPUX has a bug. */
|
||
if (strlen (msgp->mtext) >= 512)
|
||
{
|
||
fprintf (stderr, "%s: args too long for msgsnd\n", progname);
|
||
fail (argc, argv);
|
||
}
|
||
#endif
|
||
msgp->mtype = 1;
|
||
if (msgsnd (s, msgp, strlen (msgp->mtext)+1, 0) < 0)
|
||
{
|
||
fprintf (stderr, "%s: ", progname);
|
||
perror ("msgsnd");
|
||
fail (argc, argv);
|
||
}
|
||
|
||
/* Maybe wait for an answer. */
|
||
if (nowait)
|
||
return 0;
|
||
|
||
printf ("Waiting for Emacs...");
|
||
fflush (stdout);
|
||
|
||
msgrcv (s, msgp, BUFSIZ, getpid (), 0); /* wait for anything back */
|
||
strcpy (buf, msgp->mtext);
|
||
|
||
printf ("\n");
|
||
if (*buf)
|
||
printf ("%s\n", buf);
|
||
exit (0);
|
||
}
|
||
|
||
#endif /* HAVE_SYSVIPC */
|
||
|
||
#endif /* HAVE_SOCKETS or HAVE_SYSVIPC */
|
||
|
||
#ifndef HAVE_STRERROR
|
||
char *
|
||
strerror (errnum)
|
||
int errnum;
|
||
{
|
||
extern char *sys_errlist[];
|
||
extern int sys_nerr;
|
||
|
||
if (errnum >= 0 && errnum < sys_nerr)
|
||
return sys_errlist[errnum];
|
||
return (char *) "Unknown error";
|
||
}
|
||
|
||
#endif /* ! HAVE_STRERROR */
|