161 lines
3.8 KiB
C
161 lines
3.8 KiB
C
/*
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* xdmshell - simple program for running xdm from login
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*
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*
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Copyright 1988, 1998 The Open Group
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Permission to use, copy, modify, distribute, and sell this software and its
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documentation for any purpose is hereby granted without fee, provided that
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the above copyright notice appear in all copies and that both that
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copyright notice and this permission notice appear in supporting
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documentation.
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of The Open Group shall not be
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used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from The Open Group.
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* *
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* Author: Jim Fulton, MIT X Consortium
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*
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* This program should probably be setuid to root.
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*
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* WARNING: Make sure that you tailor your Xresources file to have a
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* way of invoking the abort-display() action. Otherwise, you won't be able
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* bring down X when you are finished.
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*/
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#include <stdio.h>
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#include "dm.h"
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#include <errno.h>
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#include <unistd.h>
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#ifndef BINDIR
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# define BINDIR "/usr/bin/X11"
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#endif
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/*
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* HP-UX does have vfork, but A/UX doesn't
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*/
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#ifdef HAVE_WORKING_VFORK /* autoconf's preferred name */
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# define HAS_VFORK
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#endif
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#ifndef HAS_VFORK
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# define vfork() fork()
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#endif
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static char *ProgramName;
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static int exec_args (
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char *filename,
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char **args)
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{
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pid_t pid;
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waitType status;
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if (!filename) return -1;
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if (filename[0] != '/') {
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fprintf (stderr,
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"%s: attempt to execute program with relative pathname: %s\n",
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ProgramName, filename);
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return -1;
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}
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if (access (filename, X_OK) != 0) return -1;
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switch (pid = vfork ()) {
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case -1: /* error */
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return -1;
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case 0: /* child */
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execv (filename, args);
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_exit (1);
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/* NOTREACHED */
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default: /* parent */
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while (wait (&status) != pid) ;
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}
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return waitCode (status);
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}
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#if defined(sun)
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static int exec_one_arg (
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char *filename,
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char *arg)
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{
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char *argv[3];
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argv[0] = filename;
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argv[1] = arg;
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argv[2] = NULL;
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return exec_args (filename, argv);
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}
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#endif
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int
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main (
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int argc,
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char *argv[])
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{
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int ttyfd;
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char cmdbuf[256];
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char *args[10];
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ProgramName = argv[0];
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if (argc > 1) {
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fprintf (stderr, "usage: %s\r\n", ProgramName);
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exit (1);
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}
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ttyfd = open ("/dev/tty", O_RDWR, 0);
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if (ttyfd < 3) { /* stdin = 0, stdout = 1, stderr = 2 */
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fprintf (stderr,
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"%s: must be run directly from the console.\r\n",
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ProgramName);
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exit (1);
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}
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(void) close (ttyfd);
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/* make xdm run in a non-setuid environment */
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if (setuid (geteuid()) == -1) {
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fprintf(stderr, "%s: cannot setuid (error %d, %s)\r\n",
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ProgramName, errno, strerror(errno));
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exit(1);
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}
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/*
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* exec /usr/bin/X11/xdm -nodaemon -udpPort 0
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*/
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strcpy (cmdbuf, BINDIR);
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strcat (cmdbuf, "/xdm");
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args[0] = cmdbuf;
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args[1] = "-nodaemon";
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args[2] = "-udpPort";
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args[3] = "0";
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args[4] = NULL;
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if (exec_args (cmdbuf, args) == -1) {
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fprintf (stderr, "%s: unable to execute %s (error %d, %s)\r\n",
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ProgramName, cmdbuf, errno, strerror(errno));
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exit (1);
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}
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#ifdef sun
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strcpy (cmdbuf, BINDIR);
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strcat (cmdbuf, "/kbd_mode");
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(void) exec_one_arg (cmdbuf, "-a");
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#endif
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exit (0);
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/*NOTREACHED*/
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}
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