mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-11-23 07:19:15 +00:00
5c9659d3f6
Only try su-fallback if the socket name was not explicit. Check socket name length in su-fallback case as well.
588 lines
12 KiB
C
588 lines
12 KiB
C
/* Client process that communicates with GNU Emacs acting as server.
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Copyright (C) 1986, 1987, 1994, 1999, 2000, 2001, 2003, 2004
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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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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#undef signal
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#include <ctype.h>
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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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/* Nonzero means args are expressions to be evaluated. --eval. */
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int eval = 0;
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/* The display on which Emacs should work. --display. */
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char *display = NULL;
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/* If non-NULL, the name of an editor to fallback to if the server
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is not running. --alternate-editor. */
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const char * alternate_editor = NULL;
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/* If non-NULL, the filename of the UNIX socket. */
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char *socket_name = NULL;
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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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{ "eval", no_argument, NULL, 'e' },
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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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{ "socket-name", required_argument, NULL, 's' },
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{ "display", required_argument, NULL, 'd' },
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{ 0, 0, 0, 0 }
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};
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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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"VHnea:s:d:", 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 's':
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socket_name = optarg;
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break;
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case 'd':
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display = 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 'e':
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eval = 1;
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break;
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case 'V':
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printf ("emacsclient %s\n", VERSION);
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exit (0);
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break;
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case 'H':
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print_help_and_exit ();
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break;
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default:
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fprintf (stderr, "Try `%s --help' for more information\n", progname);
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exit (1);
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break;
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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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printf (
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"Usage: %s [OPTIONS] FILE...\n\
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Tell the Emacs server to visit the specified files.\n\
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Every FILE can be either just a FILENAME or [+LINE[:COLUMN]] FILENAME.\n\
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\n\
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The following OPTIONS are accepted:\n\
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-V, --version Just print a version info and return\n\
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-H, --help Print this usage information message\n\
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-n, --no-wait Don't wait for the server to return\n\
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-e, --eval Evaluate the FILE arguments as ELisp expressions\n\
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-d, --display=DISPLAY Visit the file in the given display\n\
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-s, --socket-name=FILENAME\n\
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Set the filename of the UNIX socket for communication\n\
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-a, --alternate-editor=EDITOR\n\
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Editor to fallback to if the server is not running\n\
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\n\
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Report bugs to bug-gnu-emacs@gnu.org.\n", progname);
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exit (0);
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}
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/* In NAME, insert a & before each &, each space, each newline, and
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any initial -. Change spaces to underscores, too, so that the
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return value never contains a space. */
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void
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quote_file_name (name, stream)
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char *name;
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FILE *stream;
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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 if (*p == '\n')
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{
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*q++ = '&';
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*q++ = 'n';
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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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fprintf (stream, copy);
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free (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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void
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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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return;
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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 (NO_SOCKETS_IN_FILE_SYSTEM)
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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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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.\n");
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fail (argc, argv);
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}
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#else /* HAVE_SOCKETS */
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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, needlf = 0;
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FILE *out, *in;
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struct sockaddr_un server;
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char *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) && !eval)
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{
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fprintf (stderr, "%s: file name or argument required\n", progname);
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fprintf (stderr, "Try `%s --help' for more information\n", progname);
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exit (1);
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}
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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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char *dot;
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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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/* We always use the non-dotted host name, for simplicity. */
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dot = index (system_name, '.');
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if (dot)
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*dot = '\0';
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}
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{
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int sock_status = 0;
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int default_sock = !socket_name;
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int saved_errno;
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if (default_sock)
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{
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socket_name = alloca (system_name_length + 100);
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sprintf (socket_name, "/tmp/emacs%d-%s/server",
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(int) geteuid (), system_name);
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}
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if (strlen (socket_name) < sizeof (server.sun_path))
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strcpy (server.sun_path, socket_name);
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else
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{
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fprintf (stderr, "%s: socket-name %s too long",
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argv[0], socket_name);
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exit (1);
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}
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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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saved_errno = errno;
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if (sock_status && default_sock)
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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 (socket_name, "/tmp/emacs%d-%s/server",
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(int) pw->pw_uid, system_name);
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if (strlen (socket_name) < sizeof (server.sun_path))
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strcpy (server.sun_path, socket_name);
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else
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{
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fprintf (stderr, "%s: socket-name %s too long",
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argv[0], socket_name);
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exit (1);
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}
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sock_status = socket_status (server.sun_path);
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saved_errno = errno;
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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 (saved_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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To start the server in Emacs, type \"M-x server-start\".\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 (saved_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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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 HAVE_GETCWD
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cwd = getcwd (string, sizeof string);
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#else
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cwd = getwd (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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#ifdef HAVE_GETCWD
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fprintf (stderr, "%s: %s (%s)\n", argv[0],
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"Cannot get current working directory", strerror (errno));
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#else
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fprintf (stderr, "%s: %s (%s)\n", argv[0], string, strerror (errno));
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#endif
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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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if (eval)
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fprintf (out, "-eval ");
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if (display)
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{
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fprintf (out, "-display ");
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quote_file_name (display, out);
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fprintf (out, " ");
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}
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if ((argc - optind > 0))
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{
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for (i = optind; i < argc; i++)
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{
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if (eval)
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; /* Don't prepend any cwd or anything like that. */
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else if (*argv[i] == '+')
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{
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char *p = argv[i] + 1;
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while (isdigit ((unsigned char) *p) || *p == ':') p++;
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if (*p != 0)
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{
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quote_file_name (cwd, out);
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fprintf (out, "/");
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}
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}
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else if (*argv[i] != '/')
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{
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quote_file_name (cwd, out);
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fprintf (out, "/");
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}
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quote_file_name (argv[i], out);
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fprintf (out, " ");
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}
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}
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else
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{
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while ((str = fgets (string, BUFSIZ, stdin)))
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{
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quote_file_name (str, out);
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}
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fprintf (out, " ");
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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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if (!eval)
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{
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printf ("Waiting for Emacs...");
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needlf = 2;
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}
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fflush (stdout);
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/* Now, wait for an answer and print any messages. */
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while ((str = fgets (string, BUFSIZ, in)))
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{
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if (needlf == 2)
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printf ("\n");
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printf ("%s", str);
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needlf = str[0] == '\0' ? needlf : str[strlen (str) - 1] != '\n';
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}
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if (needlf)
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printf ("\n");
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fflush (stdout);
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return 0;
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}
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#endif /* HAVE_SOCKETS */
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#ifndef HAVE_STRERROR
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char *
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strerror (errnum)
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int errnum;
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{
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extern char *sys_errlist[];
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extern int sys_nerr;
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if (errnum >= 0 && errnum < sys_nerr)
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return sys_errlist[errnum];
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return (char *) "Unknown error";
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}
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#endif /* ! HAVE_STRERROR */
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/* arch-tag: f39bb9c4-73eb-477e-896d-50832e2ca9a7
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(do not change this comment) */
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