diff options
Diffstat (limited to 'daemon/server.c')
| -rw-r--r-- | daemon/server.c | 1583 |
1 files changed, 0 insertions, 1583 deletions
diff --git a/daemon/server.c b/daemon/server.c deleted file mode 100644 index 50256cd5..00000000 --- a/daemon/server.c +++ /dev/null @@ -1,1583 +0,0 @@ -/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- - * - * GDM - The GNOME Display Manager - * Copyright (C) 1999, 2000 Martin K. Petersen <mkp@mkp.net> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - */ - -/* This file contains functions for controlling local X servers */ - -#include "config.h" - -#include <glib/gi18n.h> -#include <stdio.h> -#include <unistd.h> -#include <stdlib.h> -#include <fcntl.h> -#include <pwd.h> -#include <grp.h> -#include <sys/types.h> -#include <sys/resource.h> -#include <sys/stat.h> -#include <sys/wait.h> -#include <sys/resource.h> -#include <strings.h> -#include <string.h> -#include <signal.h> -#include <errno.h> -#include <time.h> -#include <ctype.h> -#include <X11/Xlib.h> - -#include "gdm.h" -#include "server.h" -#include "misc.h" -#include "xdmcp.h" -#include "display.h" -#include "auth.h" -#include "slave.h" -#include "getvt.h" - -#include "gdm-common.h" -#include "gdm-log.h" -#include "gdm-daemon-config.h" - -#include "gdm-socket-protocol.h" - -/* Local prototypes */ -static void gdm_server_spawn (GdmDisplay *d, const char *vtarg); -static void gdm_server_usr1_handler (gint); -static void gdm_server_child_handler (gint); -static char * get_font_path (const char *display); - -/* Global vars */ -static int server_signal_pipe[2]; -static GdmDisplay *d = NULL; -static gboolean server_signal_notified = FALSE; -static int gdm_in_signal = 0; - -static void do_server_wait (GdmDisplay *d); -static gboolean setup_server_wait (GdmDisplay *d); - -void -gdm_server_whack_lockfile (GdmDisplay *disp) -{ - char buf[256]; - - /* X seems to be sometimes broken with its lock files and - doesn't seem to remove them always, and if you manage - to get into the weird state where the old pid now - corresponds to some new pid, X will just die with - a stupid error. */ - - /* Yes there could be a race here if another X server starts - at this exact instant. Oh well such is life. Very unlikely - to happen though as we should really be the only ones - trying to start X servers, and we aren't starting an - X server on this display yet. */ - - /* if lock file exists and it is our process, whack it! */ - g_snprintf (buf, sizeof (buf), "/tmp/.X%d-lock", disp->dispnum); - VE_IGNORE_EINTR (g_unlink (buf)); - - /* whack the unix socket as well */ - g_snprintf (buf, sizeof (buf), - "/tmp/.X11-unix/X%d", disp->dispnum); - VE_IGNORE_EINTR (g_unlink (buf)); -} - - -/* Wipe cookie files */ -void -gdm_server_wipe_cookies (GdmDisplay *disp) -{ - if ( ! ve_string_empty (disp->authfile)) { - VE_IGNORE_EINTR (g_unlink (disp->authfile)); - } - g_free (disp->authfile); - disp->authfile = NULL; - if ( ! ve_string_empty (disp->authfile_gdm)) { - VE_IGNORE_EINTR (g_unlink (disp->authfile_gdm)); - } - g_free (disp->authfile_gdm); - disp->authfile_gdm = NULL; -} - -static Jmp_buf reinitjmp; - -/* ignore handlers */ -static int -ignore_xerror_handler (Display *disp, XErrorEvent *evt) -{ - return 0; -} - -static int -jumpback_xioerror_handler (Display *disp) -{ - Longjmp (reinitjmp, 1); -} - -#ifdef HAVE_FBCONSOLE -#define FBCONSOLE "/usr/openwin/bin/fbconsole" - -static void -gdm_exec_fbconsole (GdmDisplay *disp) -{ - pid_t pid; - char *argv[6]; - - argv[0] = FBCONSOLE; - argv[1] = "-d"; - argv[2] = disp->name; - argv[3] = NULL; - - g_debug ("Forking fbconsole"); - - pid = fork (); - if (pid == 0) { - gdm_close_all_descriptors (0 /* from */, -1 /* except */, -1 /* except2 */) -; - VE_IGNORE_EINTR (execv (argv[0], argv)); - } - if (pid == -1) { - gdm_error (_("Can not start fallback console")); - } -} -#endif - -/** - * gdm_server_reinit: - * @disp: Pointer to a GdmDisplay structure - * - * Reinit the display, basically sends a HUP signal - * but only if the display exists - */ - -gboolean -gdm_server_reinit (GdmDisplay *disp) -{ - if (disp == NULL) - return FALSE; - - if (disp->servpid <= 0) { - /* Kill our connection if one existed, likely to result - * in some bizzaro error right now */ - if (disp->dsp != NULL) { - XCloseDisplay (disp->dsp); - disp->dsp = NULL; - } - return FALSE; - } - - gdm_debug ("gdm_server_reinit: Server for %s is about to be reinitialized!", disp->name); - - if ( ! setup_server_wait (disp)) - return FALSE; - - d->servstat = SERVER_PENDING; - - if (disp->dsp != NULL) { - /* static because of the Setjmp */ - static int (*old_xerror_handler)(Display *, XErrorEvent *) = NULL; - static int (*old_xioerror_handler)(Display *) = NULL; - - old_xerror_handler = NULL; - old_xioerror_handler = NULL; - - /* Do note the interaction of this Setjmp and the signal - handlers and the Setjmp in slave.c */ - - /* Long live Setjmp, DIE DIE DIE XSetIOErrorHandler */ - - if (Setjmp (reinitjmp) == 0) { - /* come here and we'll whack the server and wait to get - an xio error */ - old_xerror_handler = XSetErrorHandler (ignore_xerror_handler); - old_xioerror_handler = XSetIOErrorHandler (jumpback_xioerror_handler); - - /* Now whack the server with a SIGHUP */ - gdm_sigchld_block_push (); - if (disp->servpid > 1) - kill (disp->servpid, SIGHUP); - else - d->servstat = SERVER_DEAD; - gdm_sigchld_block_pop (); - - /* the server is dead, weird */ - if (disp->dsp != NULL) { - XCloseDisplay (disp->dsp); - disp->dsp = NULL; - } - } - /* no more display */ - disp->dsp = NULL; - XSetErrorHandler (old_xerror_handler); - XSetIOErrorHandler (old_xioerror_handler); - } else { - /* Now whack the server with a SIGHUP */ - gdm_sigchld_block_push (); - if (disp->servpid > 1) - kill (disp->servpid, SIGHUP); - else - d->servstat = SERVER_DEAD; - gdm_sigchld_block_pop (); - } - - /* Wait for the SIGUSR1 */ - do_server_wait (d); - - if (d->servstat == SERVER_RUNNING) { -#ifdef HAVE_FBCONSOLE - gdm_exec_fbconsole (d); -#endif - return TRUE; - } else { - /* if something really REALLY screwed up, then whack the - lockfiles for safety */ - gdm_server_whack_lockfile (d); - return FALSE; - } -} - -/** - * gdm_server_stop: - * @disp: Pointer to a GdmDisplay structure - * - * Stops a local X server, but only if it exists - */ - -void -gdm_server_stop (GdmDisplay *disp) -{ - static gboolean waiting_for_server = FALSE; - int old_servstat; - - if (disp == NULL) - return; - - /* Kill our connection if one existed */ - if (disp->dsp != NULL) { - /* on XDMCP servers first kill everything in sight */ - if (disp->type == TYPE_XDMCP) - gdm_server_whack_clients (disp->dsp); - XCloseDisplay (disp->dsp); - disp->dsp = NULL; - } - - /* Kill our parent connection if one existed */ - if (disp->parent_dsp != NULL) { - /* on XDMCP servers first kill everything in sight */ - if (disp->type == TYPE_XDMCP_PROXY) - gdm_server_whack_clients (disp->parent_dsp); - XCloseDisplay (disp->parent_dsp); - disp->parent_dsp = NULL; - } - - if (disp->servpid <= 0) - return; - - gdm_debug ("gdm_server_stop: Server for %s going down!", disp->name); - - old_servstat = disp->servstat; - disp->servstat = SERVER_DEAD; - - if (disp->servpid > 0) { - pid_t servpid; - - gdm_debug ("gdm_server_stop: Killing server pid %d", - (int)disp->servpid); - - /* avoid SIGCHLD race */ - gdm_sigchld_block_push (); - servpid = disp->servpid; - - if (waiting_for_server) { - gdm_error ("gdm_server_stop: Some problem killing server, whacking with SIGKILL"); - if (disp->servpid > 1) - kill (disp->servpid, SIGKILL); - - } else { - if (disp->servpid > 1 && - kill (disp->servpid, SIGTERM) == 0) { - waiting_for_server = TRUE; - ve_waitpid_no_signal (disp->servpid, NULL, 0); - waiting_for_server = FALSE; - } - } - disp->servpid = 0; - - gdm_sigchld_block_pop (); - - if (old_servstat == SERVER_RUNNING) - gdm_server_whack_lockfile (disp); - - gdm_debug ("gdm_server_stop: Server pid %d dead", (int)servpid); - - /* just in case we restart again wait at least - one sec to avoid races */ - if (d->sleep_before_run < 1) - d->sleep_before_run = 1; - } - - gdm_server_wipe_cookies (disp); - - gdm_slave_whack_temp_auth_file (); -} - -static gboolean -busy_ask_user (GdmDisplay *disp) -{ - /* if we have "open" we can talk to the user */ - if (g_access (LIBEXECDIR "/gdmopen", X_OK) == 0) { - char *error = g_strdup_printf - (C_(N_("There already appears to be an X server " - "running on display %s. Should another " - "display number by tried? Answering no will " - "cause GDM to attempt starting the server " - "on %s again.%s")), - disp->name, - disp->name, -#ifdef __linux__ - C_(N_(" (You can change consoles by pressing Ctrl-Alt " - "plus a function key, such as Ctrl-Alt-F7 to go " - "to console 7. X servers usually run on consoles " - "7 and higher.)")) -#else /* ! __linux__ */ - /* no info for non linux users */ - "" -#endif /* __linux__ */ - ); - gboolean ret = TRUE; - /* default ret to TRUE */ - if ( ! gdm_text_yesno_dialog (error, &ret)) - ret = TRUE; - g_free (error); - return ret; - } else { - /* Well we'll just try another display number */ - return TRUE; - } -} - -/* Checks only output, no XFree86 v4 logfile */ -static gboolean -display_parent_no_connect (GdmDisplay *disp) -{ - char *logname = gdm_make_filename (gdm_daemon_config_get_value_string (GDM_KEY_LOG_DIR), d->name, ".log"); - FILE *fp; - char buf[256]; - char *getsret; - - VE_IGNORE_EINTR (fp = fopen (logname, "r")); - g_free (logname); - - if (fp == NULL) - return FALSE; - - for (;;) { - VE_IGNORE_EINTR (getsret = fgets (buf, sizeof (buf), fp)); - if (getsret == NULL) { - VE_IGNORE_EINTR (fclose (fp)); - return FALSE; - } - /* Note: this is probably XFree86 specific, and perhaps even - * version 3 specific (I don't have xfree v4 to test this), - * of course additions are welcome to make this more robust */ - if (strstr (buf, "Unable to open display \"") == buf) { - gdm_error (_("Display '%s' cannot be opened by nested display"), - ve_sure_string (disp->parent_disp)); - VE_IGNORE_EINTR (fclose (fp)); - return TRUE; - } - } -} - -static gboolean -display_busy (GdmDisplay *disp) -{ - char *logname = gdm_make_filename (gdm_daemon_config_get_value_string (GDM_KEY_LOG_DIR), d->name, ".log"); - FILE *fp; - char buf[256]; - char *getsret; - - VE_IGNORE_EINTR (fp = fopen (logname, "r")); - g_free (logname); - - if (fp == NULL) - return FALSE; - - for (;;) { - VE_IGNORE_EINTR (getsret = fgets (buf, sizeof (buf), fp)); - if (getsret == NULL) { - VE_IGNORE_EINTR (fclose (fp)); - return FALSE; - } - /* Note: this is probably XFree86 specific */ - if (strstr (buf, "Server is already active for display") - == buf) { - gdm_error (_("Display %s is busy. There is another " - "X server running already."), - disp->name); - VE_IGNORE_EINTR (fclose (fp)); - return TRUE; - } - } -} - -/* if we find 'Log file: "foo"' switch fp to foo and - return TRUE */ -/* Note: assumes buf is of size 256 and is writable */ -static gboolean -open_another_logfile (char buf[256], FILE **fp) -{ - if (strncmp (&buf[5], "Log file: \"", strlen ("Log file: \"")) == 0) { - FILE *ffp; - char *fname = &buf[5+strlen ("Log file: \"")]; - char *p = strchr (fname, '"'); - if (p == NULL) - return FALSE; - *p = '\0'; - VE_IGNORE_EINTR (ffp = fopen (fname, "r")); - if (ffp == NULL) - return FALSE; - VE_IGNORE_EINTR (fclose (*fp)); - *fp = ffp; - return TRUE; - } - return FALSE; -} - -static int -display_vt (GdmDisplay *disp) -{ - char *logname = gdm_make_filename (gdm_daemon_config_get_value_string (GDM_KEY_LOG_DIR), d->name, ".log"); - FILE *fp; - char buf[256]; - gboolean switched = FALSE; - char *getsret; - - VE_IGNORE_EINTR (fp = fopen (logname, "r")); - g_free (logname); - - if (fp == NULL) - return FALSE; - - for (;;) { - int vt; - char *p; - - VE_IGNORE_EINTR (getsret = fgets (buf, sizeof (buf), fp)); - if (getsret == NULL) { - VE_IGNORE_EINTR (fclose (fp)); - return -1; - } - - if ( ! switched && - /* this is XFree v4 specific */ - open_another_logfile (buf, &fp)) { - switched = TRUE; - continue; - } - /* Note: this is probably XFree86 specific (works with - * both v3 and v4 though */ - p = strstr (buf, "using VT number "); - if (p != NULL && - sscanf (p, "using VT number %d", &vt) == 1) { - VE_IGNORE_EINTR (fclose (fp)); - return vt; - } - } -} - -static struct sigaction old_svr_wait_chld; -static sigset_t old_svr_wait_mask; - -static gboolean -setup_server_wait (GdmDisplay *d) -{ - struct sigaction usr1, chld; - sigset_t mask; - - if (pipe (server_signal_pipe) != 0) { - gdm_error (_("%s: Error opening a pipe: %s"), - "setup_server_wait", strerror (errno)); - return FALSE; - } - server_signal_notified = FALSE; - - /* Catch USR1 from X server */ - usr1.sa_handler = gdm_server_usr1_handler; - usr1.sa_flags = SA_RESTART; - sigemptyset (&usr1.sa_mask); - - if (sigaction (SIGUSR1, &usr1, NULL) < 0) { - gdm_error (_("%s: Error setting up %s signal handler: %s"), - "gdm_server_start", "USR1", strerror (errno)); - VE_IGNORE_EINTR (close (server_signal_pipe[0])); - VE_IGNORE_EINTR (close (server_signal_pipe[1])); - return FALSE; - } - - /* Catch CHLD from X server */ - chld.sa_handler = gdm_server_child_handler; - chld.sa_flags = SA_RESTART|SA_NOCLDSTOP; - sigemptyset (&chld.sa_mask); - - if (sigaction (SIGCHLD, &chld, &old_svr_wait_chld) < 0) { - gdm_error (_("%s: Error setting up %s signal handler: %s"), - "gdm_server_start", "CHLD", strerror (errno)); - gdm_signal_ignore (SIGUSR1); - VE_IGNORE_EINTR (close (server_signal_pipe[0])); - VE_IGNORE_EINTR (close (server_signal_pipe[1])); - return FALSE; - } - - /* Set signal mask */ - sigemptyset (&mask); - sigaddset (&mask, SIGUSR1); - sigaddset (&mask, SIGCHLD); - sigprocmask (SIG_UNBLOCK, &mask, &old_svr_wait_mask); - - return TRUE; -} - -static void -do_server_wait (GdmDisplay *d) -{ - /* Wait for X server to send ready signal */ - if (d->servstat == SERVER_PENDING) { - if (d->server_uid != 0 && ! d->handled && ! d->chosen_hostname) { - /* FIXME: If not handled, we just don't know, so - * just wait a few seconds and hope things just work, - * fortunately there is no such case yet and probably - * never will, but just for code anality's sake */ - gdm_sleep_no_signal (gdm_daemon_config_get_value_int(GDM_KEY_XSERVER_TIMEOUT)); - } else if (d->server_uid != 0) { - int i; - - /* FIXME: This is not likely to work in reinit, - but we never reinit Nested servers nowdays, - so that's fine */ - - /* if we're running the server as a non-root, we can't - * use USR1 of course, so try openning the display - * as a test, but the */ - - /* just in case it's set */ - g_unsetenv ("XAUTHORITY"); - - gdm_auth_set_local_auth (d); - - for (i = 0; - d->dsp == NULL && - d->servstat == SERVER_PENDING && - i < gdm_daemon_config_get_value_int(GDM_KEY_XSERVER_TIMEOUT); - i++) { - d->dsp = XOpenDisplay (d->name); - if (d->dsp == NULL) - gdm_sleep_no_signal (1); - else - d->servstat = SERVER_RUNNING; - } - if (d->dsp == NULL && - /* Note: we could have still gotten a SIGCHLD */ - d->servstat == SERVER_PENDING) { - d->servstat = SERVER_TIMEOUT; - } - } else { - time_t t = time (NULL); - - gdm_debug ("do_server_wait: Before mainloop waiting for server"); - - do { - fd_set rfds; - struct timeval tv; - - /* Wait up to GDM_KEY_XSERVER_TIMEOUT seconds. */ - tv.tv_sec = MAX (1, gdm_daemon_config_get_value_int(GDM_KEY_XSERVER_TIMEOUT) - - (time (NULL) - t)); - tv.tv_usec = 0; - - FD_ZERO (&rfds); - FD_SET (server_signal_pipe[0], &rfds); - - if (select (server_signal_pipe[0]+1, &rfds, NULL, NULL, &tv) > 0) { - char buf[4]; - /* read the Yay! */ - VE_IGNORE_EINTR (read (server_signal_pipe[0], buf, 4)); - } - if ( ! server_signal_notified && - t + gdm_daemon_config_get_value_int(GDM_KEY_XSERVER_TIMEOUT) < time (NULL)) { - gdm_debug ("do_server_wait: Server timeout"); - d->servstat = SERVER_TIMEOUT; - server_signal_notified = TRUE; - } - if (d->servpid <= 1) { - d->servstat = SERVER_ABORT; - server_signal_notified = TRUE; - } - } while ( ! server_signal_notified); - - gdm_debug ("gdm_server_start: After mainloop waiting for server"); - } - } - - /* restore default handlers */ - gdm_signal_ignore (SIGUSR1); - sigaction (SIGCHLD, &old_svr_wait_chld, NULL); - sigprocmask (SIG_SETMASK, &old_svr_wait_mask, NULL); - - VE_IGNORE_EINTR (close (server_signal_pipe[0])); - VE_IGNORE_EINTR (close (server_signal_pipe[1])); - - if (d->servpid <= 1) { - d->servstat = SERVER_ABORT; - } - - if (d->servstat != SERVER_RUNNING) { - /* bad things are happening */ - if (d->servpid > 0) { - pid_t pid; - - d->dsp = NULL; - - gdm_sigchld_block_push (); - pid = d->servpid; - d->servpid = 0; - if (pid > 1 && - kill (pid, SIGTERM) == 0) - ve_waitpid_no_signal (pid, NULL, 0); - gdm_sigchld_block_pop (); - } - - /* We will rebake cookies anyway, so wipe these */ - gdm_server_wipe_cookies (d); - } -} - -/* We keep a connection (parent_dsp) open with the parent X server - * before running a proxy on it to prevent the X server resetting - * as we open and close other connections. - * Note that XDMCP servers, by default, reset when the seed X - * connection closes whereas usually the X server only quits when - * all X connections have closed. - */ -static gboolean -connect_to_parent (GdmDisplay *d) -{ - int maxtries; - int openretries; - - gdm_debug ("gdm_server_start: Connecting to parent display \'%s\'", - d->parent_disp); - - d->parent_dsp = NULL; - - maxtries = SERVER_IS_XDMCP (d) ? 10 : 2; - - openretries = 0; - while (openretries < maxtries && - d->parent_dsp == NULL) { - d->parent_dsp = XOpenDisplay (d->parent_disp); - - if G_UNLIKELY (d->parent_dsp == NULL) { - gdm_debug ("gdm_server_start: Sleeping %d on a retry", 1+openretries*2); - gdm_sleep_no_signal (1+openretries*2); - openretries++; - } - } - - if (d->parent_dsp == NULL) - gdm_error (_("%s: failed to connect to parent display \'%s\'"), - "gdm_server_start", d->parent_disp); - - return d->parent_dsp != NULL; -} - -/** - * gdm_server_start: - * @disp: Pointer to a GdmDisplay structure - * - * Starts a local X server. Handles retries and fatal errors properly. - */ - -gboolean -gdm_server_start (GdmDisplay *disp, - gboolean try_again_if_busy /* only affects non-flexi servers */, - gboolean treat_as_flexi, - int min_flexi_disp, - int flexi_retries) -{ - int flexi_disp = 20; - char *vtarg = NULL; - int vtfd = -1, vt = -1; - - if (disp == NULL) - return FALSE; - - d = disp; - - /* if an X server exists, wipe it */ - gdm_server_stop (d); - - /* First clear the VT number */ - if (d->type == TYPE_STATIC || - d->type == TYPE_FLEXI) { - d->vt = -1; - gdm_slave_send_num (GDM_SOP_VT_NUM, -1); - } - - if (SERVER_IS_FLEXI (d) || - treat_as_flexi) { - flexi_disp = gdm_get_free_display - (MAX (gdm_daemon_config_get_high_display_num () + 1, min_flexi_disp) /* start */, - d->server_uid /* server uid */); - - g_free (d->name); - d->name = g_strdup_printf (":%d", flexi_disp); - d->dispnum = flexi_disp; - - gdm_slave_send_num (GDM_SOP_DISP_NUM, flexi_disp); - } - - if (d->type == TYPE_XDMCP_PROXY && - ! connect_to_parent (d)) - return FALSE; - - gdm_debug ("gdm_server_start: %s", d->name); - - /* Create new cookie */ - if ( ! gdm_auth_secure_display (d)) - return FALSE; - gdm_slave_send_string (GDM_SOP_COOKIE, d->cookie); - gdm_slave_send_string (GDM_SOP_AUTHFILE, d->authfile); - g_setenv ("DISPLAY", d->name, TRUE); - - if ( ! setup_server_wait (d)) - return FALSE; - - d->servstat = SERVER_DEAD; - - if (d->type == TYPE_STATIC || - d->type == TYPE_FLEXI) { - vtarg = gdm_get_empty_vt_argument (&vtfd, &vt); - } - - /* fork X server process */ - gdm_server_spawn (d, vtarg); - - /* we can now use d->handled since that's set up above */ - do_server_wait (d); - - /* If we were holding a vt open for the server, close it now as it has - * already taken the bait. */ - if (vtfd > 0) { - VE_IGNORE_EINTR (close (vtfd)); - } - - switch (d->servstat) { - - case SERVER_TIMEOUT: - gdm_debug ("gdm_server_start: Temporary server failure (%s)", d->name); - break; - - case SERVER_ABORT: - gdm_debug ("gdm_server_start: Server %s died during startup!", d->name); - break; - - case SERVER_RUNNING: - gdm_debug ("gdm_server_start: Completed %s!", d->name); - - if (SERVER_IS_FLEXI (d)) - gdm_slave_send_num (GDM_SOP_FLEXI_OK, 0 /* bogus */); - if (d->type == TYPE_STATIC || - d->type == TYPE_FLEXI) { - if (vt >= 0) - d->vt = vt; - - if (d->vt < 0) - d->vt = display_vt (d); - if (d->vt >= 0) - gdm_slave_send_num (GDM_SOP_VT_NUM, d->vt); - } - -#ifdef HAVE_FBCONSOLE - gdm_exec_fbconsole (d); -#endif - - return TRUE; - default: - break; - } - - if (SERVER_IS_PROXY (disp) && - display_parent_no_connect (disp)) { - gdm_slave_send_num (GDM_SOP_FLEXI_ERR, - 5 /* proxy can't connect */); - _exit (DISPLAY_REMANAGE); - } - - /* if this was a busy fail, that is, there is already - * a server on that display, we'll display an error and after - * this we'll exit with DISPLAY_REMANAGE to try again if the - * user wants to, or abort this display */ - if (display_busy (disp)) { - if (SERVER_IS_FLEXI (disp) || - treat_as_flexi) { - /* for flexi displays, try again a few times with different - * display numbers */ - if (flexi_retries <= 0) { - /* Send X too busy */ - gdm_error (_("%s: Cannot find a free " - "display number"), - "gdm_server_start"); - if (SERVER_IS_FLEXI (disp)) { - gdm_slave_send_num (GDM_SOP_FLEXI_ERR, - 4 /* X too busy */); - } - /* eki eki */ - _exit (DISPLAY_REMANAGE); - } - return gdm_server_start (d, FALSE /*try_again_if_busy */, - treat_as_flexi, - flexi_disp + 1, - flexi_retries - 1); - } else { - if (try_again_if_busy) { - gdm_debug ("%s: Display %s busy. Trying once again " - "(after 2 sec delay)", - "gdm_server_start", d->name); - gdm_sleep_no_signal (2); - return gdm_server_start (d, - FALSE /* try_again_if_busy */, - treat_as_flexi, - flexi_disp, - flexi_retries); - } - if (busy_ask_user (disp)) { - gdm_error (_("%s: Display %s busy. Trying " - "another display number."), - "gdm_server_start", - d->name); - d->busy_display = TRUE; - return gdm_server_start (d, - FALSE /*try_again_if_busy */, - TRUE /* treat as flexi */, - gdm_daemon_config_get_high_display_num () + 1, - flexi_retries - 1); - } - _exit (DISPLAY_REMANAGE); - } - } - - _exit (DISPLAY_XFAILED); - - return FALSE; -} - -/* Do things that require checking the log, - * we really do need to get called a bit later, after all init is done - * as things aren't written to disk before that */ -void -gdm_server_checklog (GdmDisplay *disp) -{ - if (d->vt < 0 && - (d->type == TYPE_STATIC || - d->type == TYPE_FLEXI)) { - d->vt = display_vt (d); - if (d->vt >= 0) - gdm_slave_send_num (GDM_SOP_VT_NUM, d->vt); - } -} - -/* somewhat safer rename (safer if the log dir is unsafe), may in fact - lose the file though, it guarantees that a is gone, but not that - b exists */ -static void -safer_rename (const char *a, const char *b) -{ - errno = 0; - if (link (a, b) < 0) { - if (errno == EEXIST) { - VE_IGNORE_EINTR (g_unlink (a)); - return; - } - VE_IGNORE_EINTR (g_unlink (b)); - /* likely this system doesn't support hard links */ - g_rename (a, b); - VE_IGNORE_EINTR (g_unlink (a)); - return; - } - VE_IGNORE_EINTR (g_unlink (a)); -} - -static void -rotate_logs (const char *dname) -{ - const gchar *logdir = gdm_daemon_config_get_value_string (GDM_KEY_LOG_DIR); - - /* I'm too lazy to write a loop */ - char *fname4 = gdm_make_filename (logdir, dname, ".log.4"); - char *fname3 = gdm_make_filename (logdir, dname, ".log.3"); - char *fname2 = gdm_make_filename (logdir, dname, ".log.2"); - char *fname1 = gdm_make_filename (logdir, dname, ".log.1"); - char *fname = gdm_make_filename (logdir, dname, ".log"); - - /* Rotate the logs (keep 4 last) */ - VE_IGNORE_EINTR (g_unlink (fname4)); - safer_rename (fname3, fname4); - safer_rename (fname2, fname3); - safer_rename (fname1, fname2); - safer_rename (fname, fname1); - - g_free (fname4); - g_free (fname3); - g_free (fname2); - g_free (fname1); - g_free (fname); -} - -static void -gdm_server_add_xserver_args (GdmDisplay *d, char **argv) -{ - int count; - char **args; - int len; - int i; - - len = gdm_vector_len (argv); - g_shell_parse_argv (d->xserver_session_args, &count, &args, NULL); - argv = g_renew (char *, argv, len + count + 1); - - for (i=0; i < count;i++) { - argv[len++] = g_strdup(args[i]); - } - - argv[len] = NULL; - g_strfreev (args); -} - -GdmXserver * -gdm_server_resolve (GdmDisplay *disp) -{ - char *bin; - GdmXserver *svr = NULL; - - bin = ve_first_word (disp->command); - if (bin != NULL && bin[0] != '/') { - svr = gdm_daemon_config_find_xserver (bin); - } - g_free (bin); - return svr; -} - - -static char ** -vector_merge (char * const *v1, - int len1, - char * const *v2, - int len2) -{ - int argc, i; - char **argv; - - if (v1 == NULL && v2 == NULL) - return NULL; - - argc = len1 + len2; - - argv = g_new (char *, argc + 1); - for (i = 0; i < len1; i++) - argv[i] = g_strdup (v1[i]); - for (; i < argc; i++) - argv[i] = g_strdup (v2[i - len1]); - argv[i] = NULL; - - return argv; -} - -gboolean -gdm_server_resolve_command_line (GdmDisplay *disp, - gboolean resolve_flags, - const char *vtarg, - int *argcp, - char ***argvp) -{ - char *bin; - int argc; - char **argv; - int len; - int i; - gboolean gotvtarg = FALSE; - gboolean query_in_arglist = FALSE; - - argv = NULL; - - bin = ve_first_word (disp->command); - if (bin == NULL) { - const char *str; - - gdm_error (_("Invalid server command '%s'"), disp->command); - str = gdm_daemon_config_get_value_string (GDM_KEY_STANDARD_XSERVER); - g_shell_parse_argv (str, &argc, &argv, NULL); - } else if (bin[0] != '/') { - GdmXserver *svr = gdm_daemon_config_find_xserver (bin); - if (svr == NULL) { - const char *str; - - gdm_error (_("Server name '%s' not found; " - "using standard server"), bin); - str = gdm_daemon_config_get_value_string (GDM_KEY_STANDARD_XSERVER); - g_shell_parse_argv (str, &argc, &argv, NULL); - - } else { - char **svr_command; - const char *str; - int svr_argc; - - str = ve_sure_string (svr->command); - svr_command = NULL; - g_shell_parse_argv (str, &svr_argc, &svr_command, NULL); - - g_shell_parse_argv (disp->command, &argc, &argv, NULL); - - if (argv[0] == NULL || argv[1] == NULL) { - g_strfreev (argv); - argv = svr_command; - argc = svr_argc; - } else { - char **old_argv = argv; - argv = vector_merge (svr_command, - svr_argc, - &old_argv[1], - argc); - g_strfreev (svr_command); - g_strfreev (old_argv); - - argc += svr_argc; - } - - if (resolve_flags) { - /* Setup the handled function */ - disp->handled = svr->handled; - /* never make use_chooser FALSE, - it may have been set temporarily for - us by the master */ - if (svr->chooser) - disp->use_chooser = TRUE; - disp->priority = svr->priority; - } - } - } else { - g_shell_parse_argv (disp->command, &argc, &argv, NULL); - } - - for (len = 0; argv != NULL && argv[len] != NULL; len++) { - char *arg = argv[len]; - /* HACK! Not to add vt argument to servers that already force - * allocation. Mostly for backwards compat only */ - if (strncmp (arg, "vt", 2) == 0 && - isdigit (arg[2]) && - (arg[3] == '\0' || - (isdigit (arg[3]) && arg[4] == '\0'))) - gotvtarg = TRUE; - if (strcmp (arg, "-query") == 0 || - strcmp (arg, "-indirect") == 0) - query_in_arglist = TRUE; - } - - argv = g_renew (char *, argv, len + 10); - /* shift args down one */ - for (i = len - 1; i >= 1; i--) { - argv[i+1] = argv[i]; - } - /* server number is the FIRST argument, before any others */ - argv[1] = g_strdup (disp->name); - len++; - - if (disp->authfile != NULL) { - argv[len++] = g_strdup ("-auth"); - argv[len++] = g_strdup (disp->authfile); - } - - if (resolve_flags && disp->chosen_hostname) { - /* this display is NOT handled */ - disp->handled = FALSE; - /* never ever ever use chooser here */ - disp->use_chooser = FALSE; - disp->priority = 0; - /* run just one session */ - argv[len++] = g_strdup ("-terminate"); - argv[len++] = g_strdup ("-query"); - argv[len++] = g_strdup (disp->chosen_hostname); - query_in_arglist = TRUE; - } - - if (resolve_flags && gdm_daemon_config_get_value_bool (GDM_KEY_DISALLOW_TCP) && ! query_in_arglist) { - argv[len++] = g_strdup ("-nolisten"); - argv[len++] = g_strdup ("tcp"); - d->tcp_disallowed = TRUE; - } - - if (vtarg != NULL && - ! gotvtarg) { - argv[len++] = g_strdup (vtarg); - } - - argv[len++] = NULL; - - *argvp = argv; - *argcp = len; - - g_free (bin); - - return TRUE; -} - -/** - * gdm_server_spawn: - * @disp: Pointer to a GdmDisplay structure - * - * forks an actual X server process - * - * Note that we can only use d->handled once we call this function - * since otherwise the server might not yet be looked up yet. - */ - -static void -gdm_server_spawn (GdmDisplay *d, const char *vtarg) -{ - struct sigaction ign_signal; - sigset_t mask; - int argc; - gchar **argv = NULL; - char *logfile; - int logfd; - char *command; - pid_t pid; - - if (d == NULL || - ve_string_empty (d->command)) { - return; - } - - d->servstat = SERVER_PENDING; - - gdm_sigchld_block_push (); - - /* eek, some previous copy, just wipe it */ - if (d->servpid > 0) { - pid_t pid = d->servpid; - d->servpid = 0; - if (pid > 1 && - kill (pid, SIGTERM) == 0) - ve_waitpid_no_signal (pid, NULL, 0); - } - - /* Figure out the server command */ - argv = NULL; - argc = 0; - gdm_server_resolve_command_line (d, - TRUE /* resolve flags */, - vtarg, - &argc, - &argv); - - /* Do not support additional session arguments with Xnest. */ - if (d->type != TYPE_FLEXI_XNEST) { - if (d->xserver_session_args) - gdm_server_add_xserver_args (d, argv); - } - - command = g_strjoinv (" ", argv); - - /* Fork into two processes. Parent remains the gdm process. Child - * becomes the X server. */ - - g_debug ("Forking X server process"); - - gdm_sigterm_block_push (); - pid = d->servpid = fork (); - if (pid == 0) - gdm_unset_signals (); - gdm_sigterm_block_pop (); - gdm_sigchld_block_pop (); - - switch (pid) { - - case 0: - /* the pops whacked mask again */ - gdm_unset_signals (); - - gdm_log_shutdown (); - - /* close things */ - gdm_close_all_descriptors (0 /* from */, -1 /* except */, -1 /* except2 */); - - /* No error checking here - if it's messed the best response - * is to ignore & try to continue */ - gdm_open_dev_null (O_RDONLY); /* open stdin - fd 0 */ - gdm_open_dev_null (O_RDWR); /* open stdout - fd 1 */ - gdm_open_dev_null (O_RDWR); /* open stderr - fd 2 */ - - gdm_log_init (); - - /* Rotate the X server logs */ - rotate_logs (d->name); - - /* Log all output from spawned programs to a file */ - logfile = gdm_make_filename (gdm_daemon_config_get_value_string (GDM_KEY_LOG_DIR), d->name, ".log"); - VE_IGNORE_EINTR (g_unlink (logfile)); - VE_IGNORE_EINTR (logfd = open (logfile, O_CREAT|O_TRUNC|O_WRONLY|O_EXCL, 0644)); - - if (logfd != -1) { - VE_IGNORE_EINTR (dup2 (logfd, 1)); - VE_IGNORE_EINTR (dup2 (logfd, 2)); - close (logfd); - } else { - gdm_error (_("%s: Could not open logfile for display %s!"), - "gdm_server_spawn", d->name); - } - - /* The X server expects USR1/TTIN/TTOU to be SIG_IGN */ - ign_signal.sa_handler = SIG_IGN; - ign_signal.sa_flags = SA_RESTART; - sigemptyset (&ign_signal.sa_mask); - - if (d->server_uid == 0) { - /* only set this if we can actually listen */ - if (sigaction (SIGUSR1, &ign_signal, NULL) < 0) { - gdm_error (_("%s: Error setting %s to %s"), - "gdm_server_spawn", "USR1", "SIG_IGN"); - _exit (SERVER_ABORT); - } - } - if (sigaction (SIGTTIN, &ign_signal, NULL) < 0) { - gdm_error (_("%s: Error setting %s to %s"), - "gdm_server_spawn", "TTIN", "SIG_IGN"); - _exit (SERVER_ABORT); - } - if (sigaction (SIGTTOU, &ign_signal, NULL) < 0) { - gdm_error (_("%s: Error setting %s to %s"), - "gdm_server_spawn", "TTOU", "SIG_IGN"); - _exit (SERVER_ABORT); - } - - /* And HUP and TERM are at SIG_DFL from gdm_unset_signals, - we also have an empty mask and all that fun stuff */ - - /* unblock signals (especially HUP/TERM/USR1) so that we - * can control the X server */ - sigemptyset (&mask); - sigprocmask (SIG_SETMASK, &mask, NULL); - - if (SERVER_IS_PROXY (d)) { - gboolean add_display = TRUE; - - g_unsetenv ("DISPLAY"); - if (d->parent_auth_file != NULL) - g_setenv ("XAUTHORITY", d->parent_auth_file, TRUE); - else - g_unsetenv ("XAUTHORITY"); - - if (d->type == TYPE_FLEXI_XNEST) { - char *font_path = NULL; - /* Add -fp with the current font path, but only if not - * already among the arguments */ - if (strstr (command, "-fp") == NULL) - font_path = get_font_path (d->parent_disp); - if (font_path != NULL) { - argv = g_renew (char *, argv, argc + 2); - argv[argc++] = "-fp"; - argv[argc++] = font_path; - command = g_strconcat (command, " -fp ", - font_path, NULL); - } - add_display = FALSE; - } - - /* - * Set the DISPLAY environment variable when calling - * nested server since some Xnest commands like Xephyr - * do not support the -display argument. - */ - if (add_display == TRUE) { - argv = g_renew (char *, argv, argc + 3); - argv[argc++] = "-display"; - argv[argc++] = d->parent_disp; - argv[argc++] = NULL; - command = g_strconcat (command, " -display ", - d->parent_disp, NULL); - } else { - argv = g_renew (char *, argv, argc + 1); - argv[argc++] = NULL; - g_setenv ("DISPLAY", d->parent_disp, TRUE); - } - } - - if (argv[0] == NULL) { - gdm_error (_("%s: Empty server command for display %s"), - "gdm_server_spawn", - d->name); - _exit (SERVER_ABORT); - } - - gdm_debug ("gdm_server_spawn: '%s'", command); - - if (d->priority != 0) { - if (setpriority (PRIO_PROCESS, 0, d->priority)) { - gdm_error (_("%s: Server priority couldn't be set to %d: %s"), - "gdm_server_spawn", d->priority, - strerror (errno)); - } - } - - setpgid (0, 0); - - if (d->server_uid != 0) { - struct passwd *pwent; - pwent = getpwuid (d->server_uid); - if (pwent == NULL) { - gdm_error (_("%s: Server was to be spawned by uid %d but " - "that user doesn't exist"), - "gdm_server_spawn", - (int)d->server_uid); - _exit (SERVER_ABORT); - } - if (pwent->pw_dir != NULL && - g_file_test (pwent->pw_dir, G_FILE_TEST_EXISTS)) - g_setenv ("HOME", pwent->pw_dir, TRUE); - else - g_setenv ("HOME", "/", TRUE); /* Hack */ - g_setenv ("SHELL", pwent->pw_shell, TRUE); - g_unsetenv ("MAIL"); - - if (setgid (pwent->pw_gid) < 0) { - gdm_error (_("%s: Couldn't set groupid to %d"), - "gdm_server_spawn", (int)pwent->pw_gid); - _exit (SERVER_ABORT); - } - - if (initgroups (pwent->pw_name, pwent->pw_gid) < 0) { - gdm_error (_("%s: initgroups () failed for %s"), - "gdm_server_spawn", pwent->pw_name); - _exit (SERVER_ABORT); - } - - if (setuid (d->server_uid) < 0) { - gdm_error (_("%s: Couldn't set userid to %d"), - "gdm_server_spawn", (int)d->server_uid); - _exit (SERVER_ABORT); - } - } else { - gid_t groups[1] = { 0 }; - if (setgid (0) < 0) { - gdm_error (_("%s: Couldn't set groupid to 0"), - "gdm_server_spawn"); - /* Don't error out, it's not fatal, if it fails we'll - * just still be */ - } - /* this will get rid of any suplementary groups etc... */ - setgroups (1, groups); - } - -#if sun - { - /* Remove old communication pipe, if present */ - char old_pipe[MAXPATHLEN]; - - sprintf (old_pipe, "%s/%d", SDTLOGIN_DIR, d->name); - g_unlink (old_pipe); - } -#endif - - VE_IGNORE_EINTR (execv (argv[0], argv)); - - gdm_fdprintf (2, "GDM: Xserver not found: %s\n" - "Error: Command could not be executed!\n" - "Please install the X server or correct " - "GDM configuration and restart GDM.", - command); - - gdm_error (_("%s: Xserver not found: %s"), - "gdm_server_spawn", command); - - _exit (SERVER_ABORT); - - case -1: - g_strfreev (argv); - g_free (command); - gdm_error (_("%s: Can't fork Xserver process!"), - "gdm_server_spawn"); - d->servpid = 0; - d->servstat = SERVER_DEAD; - - break; - - default: - g_strfreev (argv); - g_free (command); - gdm_debug ("%s: Forked server on pid %d", - "gdm_server_spawn", (int)pid); - break; - } -} - -/** - * gdm_server_usr1_handler: - * @sig: Signal value - * - * Received when the server is ready to accept connections - */ - -static void -gdm_server_usr1_handler (gint sig) -{ - gdm_in_signal++; - - d->servstat = SERVER_RUNNING; /* Server ready to accept connections */ - d->starttime = time (NULL); - - server_signal_notified = TRUE; - /* this will quit the select */ - VE_IGNORE_EINTR (write (server_signal_pipe[1], "Yay!", 4)); - - gdm_in_signal--; -} - - -/** - * gdm_server_child_handler: - * @sig: Signal value - * - * Received when server died during startup - */ - -static void -gdm_server_child_handler (int signal) -{ - gdm_in_signal++; - - /* go to the main child handler */ - gdm_slave_child_handler (signal); - - /* this will quit the select */ - VE_IGNORE_EINTR (write (server_signal_pipe[1], "Yay!", 4)); - - gdm_in_signal--; -} - - -void -gdm_server_whack_clients (Display *dsp) -{ - int i, screen_count; - int (* old_xerror_handler) (Display *, XErrorEvent *); - - if (dsp == NULL) - return; - - old_xerror_handler = XSetErrorHandler (ignore_xerror_handler); - - XGrabServer (dsp); - - screen_count = ScreenCount (dsp); - - for (i = 0; i < screen_count; i++) { - Window root_ret, parent_ret; - Window *childs = NULL; - unsigned int childs_count = 0; - Window root = RootWindow (dsp, i); - - while (XQueryTree (dsp, root, &root_ret, &parent_ret, - &childs, &childs_count) && - childs_count > 0) { - int ii; - - for (ii = 0; ii < childs_count; ii++) { - XKillClient (dsp, childs[ii]); - } - - XFree (childs); - } - } - - XUngrabServer (dsp); - - XSync (dsp, False); - XSetErrorHandler (old_xerror_handler); -} - -static char * -get_font_path (const char *display) -{ - Display *disp; - char **font_path; - int n_fonts; - int i; - GString *gs; - - disp = XOpenDisplay (display); - if (disp == NULL) - return NULL; - - font_path = XGetFontPath (disp, &n_fonts); - if (font_path == NULL) { - XCloseDisplay (disp); - return NULL; - } - - gs = g_string_new (NULL); - for (i = 0; i < n_fonts; i++) { - if (i != 0) - g_string_append_c (gs, ','); - - if (gdm_daemon_config_get_value_bool (GDM_KEY_XNEST_UNSCALED_FONT_PATH) == TRUE) - g_string_append (gs, font_path[i]); - else { - gchar *unscaled_ptr = NULL; - - /* - * When using Xsun Xnest, it doesn't support the - * ":unscaled" suffix in fontpath entries, so strip it. - */ - unscaled_ptr = g_strrstr (font_path[i], ":unscaled"); - if (unscaled_ptr != NULL) { - gchar *temp_string; - - temp_string = g_strndup (font_path[i], - strlen (font_path[i]) - - strlen (":unscaled")); - -gdm_debug ("font_path[i] is %s, temp_string is %s", font_path[i], temp_string); - g_string_append (gs, temp_string); - g_free (temp_string); - } else { -gdm_debug ("font_path[i] is %s", font_path[i]); - g_string_append (gs, font_path[i]); - } - } - } - - XFreeFontPath (font_path); - - XCloseDisplay (disp); - - return g_string_free (gs, FALSE); -} - -/* EOF */ |