diff options
Diffstat (limited to 'xdmshell.c')
| -rw-r--r-- | xdmshell.c | 222 |
1 files changed, 222 insertions, 0 deletions
diff --git a/xdmshell.c b/xdmshell.c new file mode 100644 index 0000000..166e689 --- /dev/null +++ b/xdmshell.c @@ -0,0 +1,222 @@ +/* $Xorg: xdmshell.c,v 1.4 2001/02/09 02:05:41 xorgcvs Exp $ */ +/* + * xdmshell - simple program for running xdm from login + * + * +Copyright 1988, 1998 The Open Group + +Permission to use, copy, modify, distribute, and sell this software and its +documentation for any purpose is hereby granted without fee, provided that +the above copyright notice appear in all copies and that both that +copyright notice and this permission notice appear in supporting +documentation. + +The above copyright notice and this permission notice shall be included in +all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN +AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN +CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + +Except as contained in this notice, the name of The Open Group shall not be +used in advertising or otherwise to promote the sale, use or other dealings +in this Software without prior written authorization from The Open Group. + * * + * Author: Jim Fulton, MIT X Consortium + * + * This program should probably be setuid to root. On the macII, it must be + * run from the console so that getty doesn't get confused about zero-length + * reads. + * + * WARNING: Make sure that you tailor your Xresources file to have a + * way of invoking the abort-display() action. Otherwise, you won't be able + * bring down X when you are finished. + */ + +#include <stdio.h> +#include "dm.h" +#include <errno.h> +#ifdef X_NOT_STDC_ENV +extern int errno; +#endif + +#ifdef macII +#define ON_CONSOLE_ONLY +#endif + +#ifdef ON_CONSOLE_ONLY +#include <sys/ioctl.h> +#endif + +#ifndef BINDIR +#define BINDIR "/usr/bin/X11" +#endif + +/* + * HP-UX does have vfork, but A/UX doesn't + */ +#ifndef HAS_VFORK +#define vfork() fork() +#endif + +char *ProgramName; + +static char *SysErrorMsg (n) + int n; +{ + char *s = strerror(n); + return (s ? s : "unknown error"); +} + + +static int exec_args (filename, args) + char *filename; + char **args; +{ + int pid; + waitType status; + + if (!filename) return -1; + + if (filename[0] != '/') { + fprintf (stderr, + "%s: attempt to execute program with relative pathname: %s\n", + ProgramName, filename); + return -1; + } + + if (access (filename, X_OK) != 0) return -1; + + switch (pid = vfork ()) { + case -1: /* error */ + return -1; + case 0: /* child */ + execv (filename, args); + _exit (1); + /* NOTREACHED */ + default: /* parent */ + while (wait (&status) != pid) ; + } + return waitCode (status); +} + +static int exec_one_arg (filename, arg) + char *filename; + char *arg; +{ + char *argv[3]; + + argv[0] = filename; + argv[1] = arg; + argv[2] = NULL; + return exec_args (filename, argv); +} + +main (argc, argv) + int argc; + char *argv[]; +{ + int ttyfd; + char cmdbuf[256]; + char *args[10]; +#ifdef ON_CONSOLE_ONLY + int consfd; + int ttypgrp, conspgrp; + char *ttyName; + extern char *ttyname(); +#endif + + ProgramName = argv[0]; + + if (argc > 1) { + fprintf (stderr, "usage: %s\r\n", ProgramName); + exit (1); + } + + ttyfd = open ("/dev/tty", O_RDWR, 0); + if (ttyfd < 3) { /* stdin = 0, stdout = 1, stderr = 2 */ + fprintf (stderr, + "%s: must be run directly from the console.\r\n", + ProgramName); + exit (1); + } +#ifdef ON_CONSOLE_ONLY + if (ioctl (ttyfd, TIOCGPGRP, (char *)&ttypgrp) != 0) { + fprintf (stderr, "%s: unable to get process group of /dev/tty\r\n", + ProgramName); + (void) close (ttyfd); + exit (1); + } +#endif + (void) close (ttyfd); + +#ifdef ON_CONSOLE_ONLY + ttyName = ttyname (0); + if (!ttyName || strcmp (ttyName, "/dev/console") != 0) { + fprintf (stderr, "%s: must login on /dev/console instead of %s\r\n", + ProgramName, ttyName ? ttyName : "non-terminal device"); + exit (1); + } + + consfd = open ("/dev/console", O_RDWR, 0); + if (consfd < 3) { /* stdin = 0, stdout = 1, stderr = 2 */ + fprintf (stderr, "%s: unable to open /dev/console\r\n", + ProgramName); + exit (1); + } + + if (ioctl (consfd, TIOCGPGRP, (char *)&conspgrp) != 0) { + fprintf (stderr, + "%s: unable to get process group of /dev/console\r\n", + ProgramName); + (void) close (consfd); + exit (1); + } + (void) close (consfd); + + if (ttypgrp != conspgrp) { + fprintf (stderr, "%s: must be run from /dev/console\r\n", + ProgramName); + exit (1); + } +#endif + + /* make xdm run in a non-setuid environment */ + setuid (geteuid()); + + /* + * exec /usr/bin/X11/xdm -nodaemon -udpPort 0 + */ + strcpy (cmdbuf, BINDIR); + strcat (cmdbuf, "/xdm"); + args[0] = cmdbuf; + args[1] = "-nodaemon"; + args[2] = "-udpPort"; + args[3] = "0"; + args[4] = NULL; + if (exec_args (cmdbuf, args) == -1) { + fprintf (stderr, "%s: unable to execute %s (error %d, %s)\r\n", + ProgramName, cmdbuf, errno, SysErrorMsg(errno)); + exit (1); + } + +#ifdef macII + strcpy (cmdbuf, BINDIR); + strcat (cmdbuf, "/Xrepair"); + (void) exec_one_arg (cmdbuf, NULL); + (void) exec_one_arg ("/usr/bin/screenrestore", NULL); +#endif + +#ifdef sun + strcpy (cmdbuf, BINDIR); + strcat (cmdbuf, "/kbd_mode"); + (void) exec_one_arg (cmdbuf, "-a"); +#endif + + exit (0); + /*NOTREACHED*/ +} + |