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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, see . # As a special exception to the GNU General Public License, if you # distribute this file as part of a program that contains a # configuration script generated by Autoconf, you may include it under # the same distribution terms that you use for the rest of that program. # Originally written by Alexandre Oliva . case $1 in '') echo "$0: No command. Try \`$0 --help' for more information." 1>&2 exit 1; ;; -h | --h*) cat <<\EOF Usage: depcomp [--help] [--version] PROGRAM [ARGS] Run PROGRAMS ARGS to compile a file, generating dependencies as side-effects. Environment variables: depmode Dependency tracking mode. source Source file read by `PROGRAMS ARGS'. object Object file output by `PROGRAMS ARGS'. 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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., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ /* * Some parts are taken from su(1) which is: * Copyright 1989 - 1994, Julianne Frances Haugh * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of Julianne F. Haugh nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * With some parts substantially derived from an ancestor of: * su for GNU. Run a shell with substitute user and group IDs. * Copyright (C) 1992-2003 Free Software Foundation, Inc. * * 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, 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. */ #include "xsession-child.h" #include "xserver.h" #include "common.h" #include "log.h" #include #include #include #include #include #include #include #include #include /* compatibility with different versions of Linux-PAM */ #ifndef PAM_ESTABLISH_CRED #define PAM_ESTABLISH_CRED PAM_CRED_ESTABLISH #endif #ifndef PAM_DELETE_CRED #define PAM_DELETE_CRED PAM_CRED_DELETE #endif /* * Truncate ~/.xsession-errors if it is longer than \a maxsize. * * The function looks for .xsession-errors in the current directory, so when it * is called the current directory must be the user's homedir. * * The function also assumes that we are running as the user. As a consequence * it does not worry about symlink attacks, because they would only be possible * if the user's home directory is group or world writable. * * curdirname is the name of the current directory, and it is only used when * logging error messages. * * The function returns true on success, false on failure. */ static int cleanup_xse(off_t maxsize, const char* curdirname) { int ret = E_OS_ERROR; int xse_fd = -1; struct stat xse_st; xse_fd = open(".xsession-errors", O_WRONLY | O_CREAT, 0600); if (xse_fd < 0) { log_err("cannot open `%s/%s': %m", curdirname, ".xsession-errors"); goto cleanup; } if (fstat(xse_fd, &xse_st) < 0) { log_err("cannot stat `%s/%s': %m", curdirname, ".xsession-errors"); goto cleanup; } if (xse_st.st_size > maxsize) { if (ftruncate(xse_fd, 0) < 0) { log_err("cannot truncate `%s/%s': %m", curdirname, ".xsession-errors"); goto cleanup; } } /* If we made it so far, we succeeded */ ret = E_SUCCESS; cleanup: if (xse_fd >= 0) close(xse_fd); return ret; } /* * setup_uid_gid() split in two functions for PAM support - * pam_setcred() needs to be called after initgroups(), but * before setuid(). */ static int setup_groups(const struct passwd *info) { /* * Set the real group ID to the primary group ID in the password * file. */ if (setgid (info->pw_gid) == -1) { log_err("bad group ID `%d' for user `%s': %m\n", info->pw_gid, info->pw_name); return E_OS_ERROR; } /* * For systems which support multiple concurrent groups, go get * the group set from the /etc/group file. */ if (initgroups (info->pw_name, info->pw_gid) == -1) { log_err("initgroups failed for user `%s': %m\n", info->pw_name); return E_OS_ERROR; } return E_SUCCESS; } static int change_uid (const struct passwd *info) { /* * Set the real UID to the UID value in the password file. */ if (setuid(info->pw_uid)) { log_err("bad user ID `%d' for user `%s': %m\n", (int)info->pw_uid, info->pw_name); return E_OS_ERROR; } return E_SUCCESS; } static int setup_pam(struct nodm_xsession_child* s) { static struct pam_conv conv = { misc_conv, NULL }; char *cp; const char *tty = 0; // Name of tty SU is run from /* We only run if we are root */ if (getuid() != 0) { log_err("can only be run by root"); return E_NOPERM; } // Set up the nodm_xsession_child structure s->pamh = NULL; s->pam_status = PAM_SUCCESS; /* * Get the tty name. Entries will be logged indicating that the user * tried to change to the named new user from the current terminal. */ if (isatty (0) && (cp = ttyname (0))) { if (strncmp (cp, "/dev/", 5) == 0) tty = cp + 5; else tty = cp; } else { tty = "???"; } s->pam_status = pam_start("nodm", s->pwent.pw_name, &conv, &s->pamh); if (s->pam_status != PAM_SUCCESS) { log_err("pam_start: error %d", s->pam_status); return E_PAM_ERROR; } s->pam_status = pam_set_item(s->pamh, PAM_TTY, (const void *) tty); if (s->pam_status == PAM_SUCCESS) s->pam_status = pam_set_item(s->pamh, PAM_RUSER, (const void *) "root"); if (s->pam_status != PAM_SUCCESS) { log_err("pam_set_item: %s", pam_strerror(s->pamh, s->pam_status)); return E_PAM_ERROR; } signal (SIGINT, SIG_IGN); signal (SIGQUIT, SIG_IGN); /* FIXME: should we ignore this, or honour it? * this can fail if the current user's account is invalid. "This * includes checking for password and account expiration, as well as * verifying access hour restrictions." */ s->pam_status = pam_acct_mgmt(s->pamh, 0); if (s->pam_status != PAM_SUCCESS) log_warn("%s (Ignored)", pam_strerror(s->pamh, s->pam_status)); signal (SIGINT, SIG_DFL); signal (SIGQUIT, SIG_DFL); /* save SU information */ log_info("Successful su on %s for %s by %s", tty, s->pwent.pw_name, "root"); /* set primary group id and supplementary groups */ if (setup_groups(&(s->pwent))) { s->pam_status = PAM_ABORT; return E_OS_ERROR; } /* * pam_setcred() may do things like resource limits, console groups, * and much more, depending on the configured modules */ s->pam_status = pam_setcred(s->pamh, PAM_ESTABLISH_CRED); if (s->pam_status != PAM_SUCCESS) { log_err("pam_setcred: %s", pam_strerror(s->pamh, s->pam_status)); return E_PAM_ERROR; } s->pam_status = pam_open_session(s->pamh, 0); if (s->pam_status != PAM_SUCCESS) { log_err("pam_open_session: %s", pam_strerror(s->pamh, s->pam_status)); pam_setcred(s->pamh, PAM_DELETE_CRED); return E_PAM_ERROR; } /* update environment with all pam set variables */ char **envcp = pam_getenvlist(s->pamh); if (envcp) { while (*envcp) { putenv(*envcp); envcp++; } } /* become the new user */ if (change_uid(&(s->pwent)) != 0) { pam_close_session(s->pamh, 0); pam_setcred(s->pamh, PAM_DELETE_CRED); s->pam_status = PAM_ABORT; return E_OS_ERROR; } return E_SUCCESS; } static void shutdown_pam(struct nodm_xsession_child* s) { if (s->pam_status == PAM_SUCCESS) { s->pam_status = pam_close_session(s->pamh, 0); if (s->pam_status != PAM_SUCCESS) log_err("pam_close_session: %s", pam_strerror(s->pamh, s->pam_status)); } pam_end(s->pamh, s->pam_status); s->pamh = 0; } int nodm_xsession_child_common_env(struct nodm_xsession_child* s) { int return_code = E_SUCCESS; // Setup environment setenv("HOME", s->pwent.pw_dir, 1); setenv("USER", s->pwent.pw_name, 1); setenv("USERNAME", s->pwent.pw_name, 1); setenv("LOGNAME", s->pwent.pw_name, 1); setenv("PWD", s->pwent.pw_dir, 1); setenv("SHELL", s->pwent.pw_shell, 1); setenv("DISPLAY", s->srv->name, 1); // Read the WINDOWPATH value from the X server return_code = nodm_xserver_connect(s->srv); if (return_code != E_SUCCESS) goto cleanup; return_code = nodm_xserver_read_window_path(s->srv); if (return_code != E_SUCCESS) goto cleanup; return_code = nodm_xserver_disconnect(s->srv); if (return_code != E_SUCCESS) goto cleanup; setenv("WINDOWPATH", s->srv->windowpath, 1); // Clear the NODM_* environment variables unsetenv("NODM_USER"); unsetenv("NODM_XINIT"); unsetenv("NODM_XSESSION"); unsetenv("NODM_X_OPTIONS"); unsetenv("NODM_MIN_SESSION_TIME"); // Move to home directory if (chdir(s->pwent.pw_dir) == 0) { // Truncate ~/.xsession-errors if (s->conf_cleanup_xse) cleanup_xse(0, s->pwent.pw_dir); } cleanup: if (s->srv->dpy != NULL) nodm_xserver_disconnect(s->srv); return return_code; } int nodm_xsession_child(struct nodm_xsession_child* s) { int res = nodm_xsession_child_common_env(s); if (res != E_SUCCESS) return res; /* * This is a workaround for Linux libc bug/feature (?) - the * /dev/log file descriptor is open without the close-on-exec flag * and used to be passed to the new shell. There is "fcntl(LogFile, * F_SETFD, 1)" in libc/misc/syslog.c, but it is commented out (at * least in 5.4.33). Why? --marekm */ log_end(); /* * PAM_DATA_SILENT is not supported by some modules, and * there is no strong need to clean up the process space's * memory since we will either call exec or exit. pam_end (pamh, PAM_SUCCESS | PAM_DATA_SILENT); */ (void)execv(s->argv[0], (char **)s->argv); exit(errno == ENOENT ? E_CMD_NOTFOUND : E_CMD_NOEXEC); } /* Signal handler for parent process later */ static int caught = 0; static void catch_signals (int sig) { ++caught; } /* This I ripped out of su.c from sh-utils after the Mandrake pam patch * have been applied. Some work was needed to get it integrated into * su.c from shadow. */ int nodm_xsession_child_pam(struct nodm_xsession_child* s) { int child = -1; sigset_t ourset; struct sigaction action; int res = setup_pam(s); if (res != E_SUCCESS) return res; // Read current signal mask sigset_t origmask; // Block all signals sigfillset (&ourset); if (sigprocmask (SIG_BLOCK, &ourset, &origmask)) { log_err("sigprocmask malfunction"); goto killed; } child = fork (); if (child == 0) { /* child shell */ // Restore original signal mask if (sigprocmask (SIG_SETMASK, &origmask, NULL)) { log_err("sigprocmask malfunction"); goto killed; } int res = nodm_xsession_child_common_env(s); if (res != E_SUCCESS) return res; /* * This is a workaround for Linux libc bug/feature (?) - the * /dev/log file descriptor is open without the close-on-exec flag * and used to be passed to the new shell. There is "fcntl(LogFile, * F_SETFD, 1)" in libc/misc/syslog.c, but it is commented out (at * least in 5.4.33). Why? --marekm */ log_end(); /* * PAM_DATA_SILENT is not supported by some modules, and * there is no strong need to clean up the process space's * memory since we will either call exec or exit. pam_end (pamh, PAM_SUCCESS | PAM_DATA_SILENT); */ (void) execv(s->argv[0], (char **)s->argv); exit (errno == ENOENT ? E_CMD_NOTFOUND : E_CMD_NOEXEC); } else if (child == -1) { log_err("cannot fork user shell: %m"); return E_OS_ERROR; } /* parent only */ /* Reset caught signal flag */ caught = 0; /* Catch SIGTERM and SIGALRM using 'catch_signals' */ action.sa_handler = catch_signals; sigemptyset (&action.sa_mask); action.sa_flags = 0; sigemptyset (&ourset); if (sigaddset (&ourset, SIGTERM) #ifdef DEBUG_NODM || sigaddset (&ourset, SIGINT) || sigaddset (&ourset, SIGQUIT) #endif || sigaddset (&ourset, SIGALRM) || sigaction (SIGTERM, &action, NULL) || sigprocmask (SIG_UNBLOCK, &ourset, NULL) ) { log_err("signal masking malfunction"); goto killed; } do { int pid; pid = waitpid (-1, &(s->exit_status), WUNTRACED); if (WIFSTOPPED (s->exit_status)) { kill (getpid (), SIGSTOP); /* once we get here, we must have resumed */ kill (pid, SIGCONT); } } while (WIFSTOPPED (s->exit_status)); /* Unblock signals */ sigfillset (&ourset); if (sigprocmask (SIG_UNBLOCK, &ourset, NULL)) { log_err("signal malfunction"); goto killed; } if (caught) goto killed; shutdown_pam(s); return E_SUCCESS; killed: if (child != -1) { log_warn("session terminated, killing shell..."); kill (child, SIGTERM); sleep (2); kill (child, SIGKILL); log_warn(" ...shell killed."); } shutdown_pam(s); return E_SESSION_DIED; } nodm-0.11/aclocal.m40000644000175000017500000010435511622726304011164 00000000000000# generated automatically by aclocal 1.11.1 -*- Autoconf -*- # Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, # 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc. # This file is free software; the Free Software Foundation # gives unlimited permission to copy and/or distribute it, # with or without modifications, as long as this notice is preserved. # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY, to the extent permitted by law; without # even the implied warranty of MERCHANTABILITY or FITNESS FOR A # PARTICULAR PURPOSE. m4_ifndef([AC_AUTOCONF_VERSION], [m4_copy([m4_PACKAGE_VERSION], [AC_AUTOCONF_VERSION])])dnl m4_if(m4_defn([AC_AUTOCONF_VERSION]), [2.68],, [m4_warning([this file was generated for autoconf 2.68. 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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., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #ifndef NODM_SERVER_H #define NODM_SERVER_H #include #include /// Supervise an X server struct nodm_xserver { /// Timeout (in seconds) to use waiting for X to start int conf_timeout; /// X server command line const char **argv; /// X display name const char *name; /// X window path (dynamically allocated and owned by this structure) char *windowpath; /// X server pid pid_t pid; /// xlib Display connected to the server Display *dpy; /// Original signal mask at program startup sigset_t orig_signal_mask; }; /** * Initialise a struct nodm_xserver with NULL values */ void nodm_xserver_init(struct nodm_xserver* srv); /** * Start the X server and wait until it is ready to accept connections. * * @param srv * The struct nodm_xserver with X server information. argv and name are expected to * be filled, pid is filled. * @return * Exit status as described by the E_* constants */ int nodm_xserver_start(struct nodm_xserver* srv); /// Stop the X server int nodm_xserver_stop(struct nodm_xserver* srv); /// Dump all internal status to stderr void nodm_xserver_dump_status(struct nodm_xserver* srv); /** * Connect to the X server * * Uses srv->name, sets srv->dpy. * * @return * Exit status as described by the E_* constants */ int nodm_xserver_connect(struct nodm_xserver* srv); /** * Close connection to the X server * * Uses srv->dpy, sets it to NULL. * * @return * Exit status as described by the E_* constants */ int nodm_xserver_disconnect(struct nodm_xserver* srv); /** * Get the WINDOWPATH value for the server * * Uses srv->dpy, sets srv->windowpath * * @return * Exit status as described by the E_* constants */ int nodm_xserver_read_window_path(struct nodm_xserver* srv); /// Report that the X session has quit void nodm_xserver_report_exit(struct nodm_xserver* s, int status); #endif nodm-0.11/vt.h0000644000175000017500000000260311605342762010122 00000000000000/* * vt - VT allocation * * Copyright 2009--2011 Enrico Zini * * 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., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #ifndef NODM_VT_H #define NODM_VT_H /// VT allocation state struct nodm_vt { /** * First VT to try to allocate. -1 means 'no VT allocation' */ int conf_initial_vt; /// Number of the VT that has been allocated (-1 for none) int num; /// File decriptor pointing to the open VT (-1 for none) int fd; }; /// Initialise a vt structure with default values void nodm_vt_init(struct nodm_vt* vt); /// Allocate a virtual terminal and keep it open int nodm_vt_start(struct nodm_vt* vt); /// Release the virtual terminal void nodm_vt_stop(struct nodm_vt* vt); #endif nodm-0.11/test-xstart.c0000644000175000017500000000315111606017413011756 00000000000000/* * test-xstart - test that we are able to start X * * Copyright 2011 Enrico Zini * * 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., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include "log.h" #include "xserver.h" #include "test.h" #include "common.h" #include #include #include int main(int argc, char* argv[]) { test_start("test-xstart", false); struct nodm_xserver srv; nodm_xserver_init(&srv); const char* server_argv[] = { getenv("DISPLAY") == NULL ? "/usr/bin/X" : "/usr/bin/Xnest", ":1", NULL }; srv.argv = server_argv; srv.name = ":1"; int res = nodm_xserver_start(&srv); if (res != E_SUCCESS) { fprintf(stderr, "nodm_xserver_start return code: %d\n", res); return res; } res = nodm_xserver_stop(&srv); if (res != E_SUCCESS) { fprintf(stderr, "nodm_xserver_stop return code: %d\n", res); return res; } test_ok(); } nodm-0.11/m4/0000755000175000017500000000000011622734255007720 500000000000000nodm-0.11/m4/pkg.m40000644000175000017500000001214511605342762010665 00000000000000# pkg.m4 - Macros to locate and utilise pkg-config. -*- Autoconf -*- # # Copyright © 2004 Scott James Remnant . # # 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. 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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., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include "log.h" #include "common.h" #include "dm.h" #include "xserver.h" #include "xsession-child.h" #include "test.h" #include #include #include #include #include #include static char orig_windowpath[1024]; int test_session(struct nodm_xsession_child* s) { int res = nodm_xsession_child_common_env(s); if (res != E_SUCCESS) return res; // Check environment ensure_not_equals(orig_windowpath, getenv_with_default("WINDOWPATH", "")); return E_SUCCESS; } int test_session_bad(struct nodm_xsession_child* s) { int res = nodm_xsession_child_common_env(s); if (res != E_SUCCESS) return res; return E_USAGE; } int test_session_x_killer(struct nodm_xsession_child* s) { int res = nodm_xsession_child_common_env(s); if (res != E_SUCCESS) return res; if (s->srv->pid == -1) { fprintf(stderr, "server PID has not been set\n"); return E_BAD_ARG; } kill(s->srv->pid, SIGTERM); sleep(10); return E_SUCCESS; } // X server starts, X session quits with success void test_trivial_session() { log_verb("test_trivial_session"); struct nodm_display_manager dm; test_setup_dm(&dm, NULL); dm.session.child_body = test_session; ensure_succeeds(nodm_display_manager_start(&dm)); int sstatus; ensure_equali(nodm_display_manager_wait(&dm, &sstatus), E_SESSION_DIED); ensure_equali(sstatus, E_SUCCESS); ensure_succeeds(nodm_display_manager_stop(&dm)); nodm_display_manager_cleanup(&dm); } // X server does not start void test_bad_x_server() { log_verb("test_bad_x_server"); struct nodm_display_manager dm; test_setup_dm(&dm, "/bin/false"); dm.session.child_body = test_session; ensure_equali(nodm_display_manager_start(&dm), E_X_SERVER_DIED); // If xserver died before being ready for connections, it should reflect on // the tracked pid ensure_equali(dm.srv.pid, -1); // Session must not have been started ensure_equali(dm.session.pid, -1); ensure_succeeds(nodm_display_manager_stop(&dm)); nodm_display_manager_cleanup(&dm); } // X server starts, X session quits with error void test_failing_x_session() { log_verb("test_failing_x_session"); struct nodm_display_manager dm; test_setup_dm(&dm, NULL); dm.session.child_body = test_session_bad; ensure_succeeds(nodm_display_manager_start(&dm)); int sstatus; ensure_equali(nodm_display_manager_wait(&dm, &sstatus), E_SESSION_DIED); ensure_equali(WIFEXITED(sstatus) ? 1 : 0, 1); ensure_equali(WEXITSTATUS(sstatus), E_USAGE); ensure_succeeds(nodm_display_manager_stop(&dm)); nodm_display_manager_cleanup(&dm); } // X server starts, X session starts, then server dies void test_dying_x_server() { log_verb("test_dying_x_server"); struct nodm_display_manager dm; test_setup_dm(&dm, NULL); dm.session.child_body = test_session_x_killer; ensure_succeeds(nodm_display_manager_start(&dm)); int sstatus; ensure_equali(nodm_display_manager_wait(&dm, &sstatus), E_X_SERVER_DIED); ensure_equali(sstatus, -1); ensure_succeeds(nodm_display_manager_stop(&dm)); nodm_display_manager_cleanup(&dm); } int main(int argc, char* argv[]) { test_start("test-xsession", true); // Save original window path to check if it changed in the X session (void)bounded_strcpy(orig_windowpath, getenv_with_default("WINDOWPATH", "")); test_trivial_session(); test_bad_x_server(); test_failing_x_session(); test_dying_x_server(); // TODO: // - test a wrong username (error before starting X session) test_ok(); } nodm-0.11/xsession-child.h0000644000175000017500000000342611605342762012431 00000000000000/* * xsession-child - child side of X session * * Copyright 2011 Enrico Zini * * 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., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #ifndef NODM_XSESSION_CHILD_H #define NODM_XSESSION_CHILD_H #include #include #include struct nodm_xserver; struct nodm_xsession_child { /// X server we connect to struct nodm_xserver* srv; /// If set to true, perform ~/.xsession-errors cleanup bool conf_cleanup_xse; /// Information about the user we run the session for struct passwd pwent; /// PAM session handle (or NULL if not used) pam_handle_t *pamh; /// Return code of the last PAM function called int pam_status; /// Command line to run const char** argv; /// Child exit status int exit_status; }; /// Setup common environment bits in the child process int nodm_xsession_child_common_env(struct nodm_xsession_child* s); /// Just exec the session int nodm_xsession_child(struct nodm_xsession_child* s); /// Run a child process inside a PAM session int nodm_xsession_child_pam(struct nodm_xsession_child* s); #endif nodm-0.11/TODO0000644000175000017500000000431011606521264010002 00000000000000xauth: 01:48 #openmoko-debian < lindi-> enrico: hmm, http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=595750 is still open? 01:53 #openmoko-debian < lindi-> enrico: just generating cookiefile to to some /var/lib/nodm/ and using it in Xorg -auth and $XAUTHORITY should fix it 01:56 #openmoko-debian < enrico> lindi-: the bug is still open but it's indeed ripe for closing; only, I do not know how that machinery works 01:57 #openmoko-debian < lindi-> gdm3 _create_xauth_file_for_user has all the details 01:57 #openmoko-debian < enrico> progress: after testing the display manaager on my freerunner and seeing that it works, I've now merged my branch on master 01:57 #openmoko-debian < lindi-> as you can guess, lots of paranoid checks :) 01:57 #openmoko-debian < lindi-> *cookie = gdm_generate_random_bytes (GDM_DISPLAY_ACCESS_COOKIE_SIZE, &add_error); 01:59 #openmoko-debian < enrico> lindi-: neat, sounds doable. I now have full control over the X command line in a very cool way 01:59 #openmoko-debian < lindi-> enrico: but I kind of like how gdm3 does it. for example now I have /var/run/gdm3/auth-for-lindi-uoAyyh/database 02:00 #openmoko-debian < enrico> lindi-: mind if I write it to $HOME/.Xauthority ? I rather not having to maintain a custom dir structure on /var/run for nodm 02:00 #openmoko-debian < lindi-> enrico: I kind of like gdm3 approach more, writing to $HOME is ugly. since user can use it on multiple machines you need to merge the stuff 02:00 #openmoko-debian < lindi-> enrico: you can't just overwrite .Xauthority 02:00 #openmoko-debian < enrico> lindi-: oh merge the stuff ouch 02:00 #openmoko-debian < lindi-> enrico: you also don't want to infinitely concatenate it 02:00 #openmoko-debian < enrico> lindi-: I see the point 02:00 #openmoko-debian < lindi-> and think of locking, nfs 02:01 #openmoko-debian < lindi-> gdm-display-access-file.c in gdm3 sources has all the logic oppure fare uno script da sourciare prima di far partire X nodm-0.11/README0000644000175000017500000000734711611374461010210 00000000000000 * README for nodm nodm is a minimal display manager that simply logs in as a given user and starts an X session, without asking for username or password. On a normal computer, using nodm is a big security issue because it would give anyone access to the computer. However, there are cases where automatic login is needed: for example in an embedded system such as a mobile phone, or in a kiosk setup, or in a control panel for industrial machinery. For those cases, nodm is simple to setup, lightweight, and it should do exactly the right thing. * Features nodm is as small as it could be, and tries to provide the minimum amount of features needed to do a good job, following as much as possible the principle of least surprise. This is what is offered: - Automatic login with a fixed user, doing all that needs to be done like setting up the session via PAM, updating lastlog, logging to syslog. - nodm performs VT allocation, looking for a free virtual terminal in which to run X and keeping it allocated across X restarts. - X is started (by default, /usr/bin/X) - once the X esrver is ready to accept connections, the X session is set up: - the DISPLAY and WINDOWPATH environment variables are set - the session is wrapped in a PAM session, which sets up the user environment - ~/.xsession-error is truncated if it exists - The session script is run (by default, /etc/X11/Xsession) using "sh -l" - If the X server or the X session exit, the other is killed and then both are restarted. - If a session exits too soon, nodm will wait a bit before restarting. The waiting times go as follow: - The first time the session exits too soon, restart immediately - The second and third time, wait 30 seconds - All remaining times, wait 1 minute. Once a session lasts long enough, the waiting time goes back to zero. nodm does NOT currently fork and run in the background like a proper daemon: most distributions have tools that do that, and nodm plays just fine with them. This is not a particular design choice: quite simply, so far no one has felt the need to implement it. * Configuration Configuration is made via 5 environment variables: NODM_USER Controls the user that is used to automatically log in. NODM_X_OPTIONS X server command line (for example: "vt7 -nolisten tcp"). It is expanded using wordexp, with tilde expansion, variable substitution, arithmetic expansion, wildcard expansion and quote removal, but no command substitution. If command substitution is needed, please get in touch providing a real-life use case for it. If the first optiom starts with '/' or '.', it is used as the X server, else "X" is used as the server. If the second option (or the first if the first was not recognised as a path to the X server) looks like ":", it is used as the display name, else ":0" is used. If the command line contains a "vt" virtual terminal indicator, automatic VT allocation is switched off. Otherwise, the appropriate vt option is appended to the X command line according to the virtual terminal that has been allocated. NODM_MIN_SESSION_TIME Minimum time (in seconds) that a session should last in order for nodm to decide that it has not quit too soon. If an X session runs for less than this time, nodm will wait an increasing amount of time before restarting it (default: 60). NODM_XSESSION X session command (default: /etc/X11/Xsession). It is run using the shell, so it can be any shell command. NODM_XINIT Was used by older versions of nodm as the path to the xinit program, but it is now ignored. NODM_X_TIMEOUT Timeout (in seconds) to wait for X to be ready to accept connections. If X is not ready before this timeout, it is killed and restarted. nodm-0.11/common.c0000644000175000017500000001033411605342762010754 00000000000000/* * common - common nodm definitions and utility functions * * Copyright 2011 Enrico Zini * * 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., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include "common.h" #include "log.h" #include #include #include #include const char* basename (const char* str) { const char *cp = strrchr (str, '/'); return cp ? cp + 1 : str; } const char* getenv_with_default(const char* envname, const char* def) { const char* res = getenv(envname); if (res != NULL) return res; else return def; } const char* nodm_strerror(int code) { switch (code) { case E_SUCCESS: return "success"; case E_NOPERM: return "permission denied"; case E_USAGE: return "invalid command syntax"; case E_BAD_ARG: return "invalid argument to option"; case E_PASSWD_NOTFOUND: return "not found password file"; case E_SHADOW_NOTFOUND: return "not found shadow password file"; case E_GROUP_NOTFOUND: return "not found group file"; case E_GSHADOW_NOTFOUND: return "not found shadow group file"; case E_CMD_NOEXEC: return "can't run command/shell"; case E_CMD_NOTFOUND: return "can't find command/shell to run"; case E_PROGRAMMING: return "programming error"; case E_PAM_ERROR: return "something wrong talking with PAM"; case E_OS_ERROR: return "something wrong talking with the Operating System"; case E_XLIB_ERROR: return "Xlib error"; case E_X_SERVER_DIED: return "server died"; case E_X_SERVER_TIMEOUT: return "server not ready before timeout"; case E_X_SERVER_CONNECT: return "could not connect to X server"; case E_SESSION_DIED: return "X session died"; case E_USER_QUIT: return "quit requested"; default: return "unknown error"; } } int child_has_quit(pid_t pid, int* quit, int* status) { pid_t res = waitpid(pid, status, WNOHANG); if (res == -1) { if (errno == ECHILD) *quit = 2; else { log_err("error checking status of child process %d: %m", (int)pid); return E_OS_ERROR; } } else if (res == 0) *quit = 0; else *quit = 1; return E_SUCCESS; } int child_must_exit(pid_t pid, const char* procdesc) { int res = E_SUCCESS; if (pid > 0) { // Check what is the child status int quit, status; res = child_has_quit(pid, &quit, &status); if (res != E_SUCCESS) return res; switch (quit) { case 0: // still running, we must kill it log_info("sending %s %d the TERM signal", procdesc, (int)pid); kill(pid, SIGTERM); kill(pid, SIGCONT); while (true) { int status; if (waitpid(pid, &status, 0) == -1) { if (errno == EINTR) continue; if (errno != ECHILD) return E_OS_ERROR; } break; } break; case 1: // has just quit log_info("%s %d quit with status %d", procdesc, (int)pid, status); break; case 2: // Was not there break; } } return E_SUCCESS; } nodm-0.11/config.h.in0000644000175000017500000000127511622726310011341 00000000000000/* config.h.in. Generated from configure.ac by autoheader. */ /* Name of package */ #undef PACKAGE /* Define to the address where bug reports for this package should be sent. */ #undef PACKAGE_BUGREPORT /* Define to the full name of this package. */ #undef PACKAGE_NAME /* Define to the full name and version of this package. */ #undef PACKAGE_STRING /* Define to the one symbol short name of this package. */ #undef PACKAGE_TARNAME /* Define to the home page for this package. */ #undef PACKAGE_URL /* Define to the version of this package. */ #undef PACKAGE_VERSION /* Define to 1 if you have the ANSI C header files. */ #undef STDC_HEADERS /* Version number of package */ #undef VERSION nodm-0.11/test.h0000644000175000017500000000361111605631245010445 00000000000000/* * test - nodm test utilities * * Copyright 2011 Enrico Zini * * 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., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #ifndef NODM_TEST_H #define NODM_TEST_H #include "log.h" #include #include struct nodm_display_manager; /// Setup the logging system for a test script void test_start(const char* testname, bool verbose); /// exit() the program reporting a test failure void test_fail() __attribute__((noreturn)); /// exit() the program reporting a success void test_ok() __attribute__((noreturn)); /** * Setup DM for tests * * If running as root and no $DISPLAY is set, tries to start X, else tries to * start xnest. * * @param xcmdline * Can be NULL for the appropriate default. */ void test_setup_dm(struct nodm_display_manager* dm, const char* xcmdline); /// Ensure that two strings are the same void ensure_equals(const char* a, const char* b); /// Ensure that two strings are different void ensure_not_equals(const char* a, const char* b); /// Ensure that two integers are the same void ensure_equali(int a, int b); #define ensure_succeeds(val) _ensure_succeeds((val), __FILE__, __LINE__, #val) void _ensure_succeeds(int code, const char* file, int line, const char* desc); #endif nodm-0.11/ChangeLog0000644000175000017500000000022611150562237011065 000000000000002009-02-23 enrico@enricozini.org * Autotoolized * Run self as the session, using $NODM_RUN_SESSION to signal that it should behave differently nodm-0.11/COPYING0000644000175000017500000004310311150562237010347 00000000000000 GNU GENERAL PUBLIC LICENSE Version 2, June 1991 Copyright (C) 1989, 1991 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. Preamble The licenses for most software are designed to take away your freedom to share and change it. By contrast, the GNU General Public License is intended to guarantee your freedom to share and change free software--to make sure the software is free for all its users. This General Public License applies to most of the Free Software Foundation's software and to any other program whose authors commit to using it. (Some other Free Software Foundation software is covered by the GNU Lesser General Public License instead.) You can apply it to your programs, too. When we speak of free software, we are referring to freedom, not price. Our General Public Licenses are designed to make sure that you have the freedom to distribute copies of free software (and charge for this service if you wish), that you receive source code or can get it if you want it, that you can change the software or use pieces of it in new free programs; and that you know you can do these things. To protect your rights, we need to make restrictions that forbid anyone to deny you these rights or to ask you to surrender the rights. These restrictions translate to certain responsibilities for you if you distribute copies of the software, or if you modify it. For example, if you distribute copies of such a program, whether gratis or for a fee, you must give the recipients all the rights that you have. You must make sure that they, too, receive or can get the source code. And you must show them these terms so they know their rights. We protect your rights with two steps: (1) copyright the software, and (2) offer you this license which gives you legal permission to copy, distribute and/or modify the software. Also, for each author's protection and ours, we want to make certain that everyone understands that there is no warranty for this free software. If the software is modified by someone else and passed on, we want its recipients to know that what they have is not the original, so that any problems introduced by others will not reflect on the original authors' reputations. Finally, any free program is threatened constantly by software patents. We wish to avoid the danger that redistributors of a free program will individually obtain patent licenses, in effect making the program proprietary. To prevent this, we have made it clear that any patent must be licensed for everyone's free use or not licensed at all. The precise terms and conditions for copying, distribution and modification follow. GNU GENERAL PUBLIC LICENSE TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 0. This License applies to any program or other work which contains a notice placed by the copyright holder saying it may be distributed under the terms of this General Public License. The "Program", below, refers to any such program or work, and a "work based on the Program" means either the Program or any derivative work under copyright law: that is to say, a work containing the Program or a portion of it, either verbatim or with modifications and/or translated into another language. (Hereinafter, translation is included without limitation in the term "modification".) Each licensee is addressed as "you". Activities other than copying, distribution and modification are not covered by this License; they are outside its scope. The act of running the Program is not restricted, and the output from the Program is covered only if its contents constitute a work based on the Program (independent of having been made by running the Program). Whether that is true depends on what the Program does. 1. You may copy and distribute verbatim copies of the Program's source code as you receive it, in any medium, provided that you conspicuously and appropriately publish on each copy an appropriate copyright notice and disclaimer of warranty; keep intact all the notices that refer to this License and to the absence of any warranty; and give any other recipients of the Program a copy of this License along with the Program. You may charge a fee for the physical act of transferring a copy, and you may at your option offer warranty protection in exchange for a fee. 2. You may modify your copy or copies of the Program or any portion of it, thus forming a work based on the Program, and copy and distribute such modifications or work under the terms of Section 1 above, provided that you also meet all of these conditions: a) You must cause the modified files to carry prominent notices stating that you changed the files and the date of any change. b) You must cause any work that you distribute or publish, that in whole or in part contains or is derived from the Program or any part thereof, to be licensed as a whole at no charge to all third parties under the terms of this License. c) If the modified program normally reads commands interactively when run, you must cause it, when started running for such interactive use in the most ordinary way, to print or display an announcement including an appropriate copyright notice and a notice that there is no warranty (or else, saying that you provide a warranty) and that users may redistribute the program under these conditions, and telling the user how to view a copy of this License. (Exception: if the Program itself is interactive but does not normally print such an announcement, your work based on the Program is not required to print an announcement.) These requirements apply to the modified work as a whole. If identifiable sections of that work are not derived from the Program, and can be reasonably considered independent and separate works in themselves, then this License, and its terms, do not apply to those sections when you distribute them as separate works. But when you distribute the same sections as part of a whole which is a work based on the Program, the distribution of the whole must be on the terms of this License, whose permissions for other licensees extend to the entire whole, and thus to each and every part regardless of who wrote it. Thus, it is not the intent of this section to claim rights or contest your rights to work written entirely by you; rather, the intent is to exercise the right to control the distribution of derivative or collective works based on the Program. In addition, mere aggregation of another work not based on the Program with the Program (or with a work based on the Program) on a volume of a storage or distribution medium does not bring the other work under the scope of this License. 3. You may copy and distribute the Program (or a work based on it, under Section 2) in object code or executable form under the terms of Sections 1 and 2 above provided that you also do one of the following: a) Accompany it with the complete corresponding machine-readable source code, which must be distributed under the terms of Sections 1 and 2 above on a medium customarily used for software interchange; or, b) Accompany it with a written offer, valid for at least three years, to give any third party, for a charge no more than your cost of physically performing source distribution, a complete machine-readable copy of the corresponding source code, to be distributed under the terms of Sections 1 and 2 above on a medium customarily used for software interchange; or, c) Accompany it with the information you received as to the offer to distribute corresponding source code. (This alternative is allowed only for noncommercial distribution and only if you received the program in object code or executable form with such an offer, in accord with Subsection b above.) The source code for a work means the preferred form of the work for making modifications to it. For an executable work, complete source code means all the source code for all modules it contains, plus any associated interface definition files, plus the scripts used to control compilation and installation of the executable. However, as a special exception, the source code distributed need not include anything that is normally distributed (in either source or binary form) with the major components (compiler, kernel, and so on) of the operating system on which the executable runs, unless that component itself accompanies the executable. If distribution of executable or object code is made by offering access to copy from a designated place, then offering equivalent access to copy the source code from the same place counts as distribution of the source code, even though third parties are not compelled to copy the source along with the object code. 4. You may not copy, modify, sublicense, or distribute the Program except as expressly provided under this License. Any attempt otherwise to copy, modify, sublicense or distribute the Program is void, and will automatically terminate your rights under this License. However, parties who have received copies, or rights, from you under this License will not have their licenses terminated so long as such parties remain in full compliance. 5. You are not required to accept this License, since you have not signed it. However, nothing else grants you permission to modify or distribute the Program or its derivative works. These actions are prohibited by law if you do not accept this License. Therefore, by modifying or distributing the Program (or any work based on the Program), you indicate your acceptance of this License to do so, and all its terms and conditions for copying, distributing or modifying the Program or works based on it. 6. Each time you redistribute the Program (or any work based on the Program), the recipient automatically receives a license from the original licensor to copy, distribute or modify the Program subject to these terms and conditions. You may not impose any further restrictions on the recipients' exercise of the rights granted herein. You are not responsible for enforcing compliance by third parties to this License. 7. If, as a consequence of a court judgment or allegation of patent infringement or for any other reason (not limited to patent issues), conditions are imposed on you (whether by court order, agreement or otherwise) that contradict the conditions of this License, they do not excuse you from the conditions of this License. If you cannot distribute so as to satisfy simultaneously your obligations under this License and any other pertinent obligations, then as a consequence you may not distribute the Program at all. For example, if a patent license would not permit royalty-free redistribution of the Program by all those who receive copies directly or indirectly through you, then the only way you could satisfy both it and this License would be to refrain entirely from distribution of the Program. If any portion of this section is held invalid or unenforceable under any particular circumstance, the balance of the section is intended to apply and the section as a whole is intended to apply in other circumstances. It is not the purpose of this section to induce you to infringe any patents or other property right claims or to contest validity of any such claims; this section has the sole purpose of protecting the integrity of the free software distribution system, which is implemented by public license practices. Many people have made generous contributions to the wide range of software distributed through that system in reliance on consistent application of that system; it is up to the author/donor to decide if he or she is willing to distribute software through any other system and a licensee cannot impose that choice. This section is intended to make thoroughly clear what is believed to be a consequence of the rest of this License. 8. If the distribution and/or use of the Program is restricted in certain countries either by patents or by copyrighted interfaces, the original copyright holder who places the Program under this License may add an explicit geographical distribution limitation excluding those countries, so that distribution is permitted only in or among countries not thus excluded. In such case, this License incorporates the limitation as if written in the body of this License. 9. The Free Software Foundation may publish revised and/or new versions of the General Public License from time to time. Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or concerns. Each version is given a distinguishing version number. If the Program specifies a version number of this License which applies to it and "any later version", you have the option of following the terms and conditions either of that version or of any later version published by the Free Software Foundation. If the Program does not specify a version number of this License, you may choose any version ever published by the Free Software Foundation. 10. If you wish to incorporate parts of the Program into other free programs whose distribution conditions are different, write to the author to ask for permission. For software which is copyrighted by the Free Software Foundation, write to the Free Software Foundation; we sometimes make exceptions for this. Our decision will be guided by the two goals of preserving the free status of all derivatives of our free software and of promoting the sharing and reuse of software generally. NO WARRANTY 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. END OF TERMS AND CONDITIONS How to Apply These Terms to Your New Programs If you develop a new program, and you want it to be of the greatest possible use to the public, the best way to achieve this is to make it free software which everyone can redistribute and change under these terms. To do so, attach the following notices to the program. It is safest to attach them to the start of each source file to most effectively convey the exclusion of warranty; and each file should have at least the "copyright" line and a pointer to where the full notice is found. Copyright (C) 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. Also add information on how to contact you by electronic and paper mail. If the program is interactive, make it output a short notice like this when it starts in an interactive mode: Gnomovision version 69, Copyright (C) year name of author Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. This is free software, and you are welcome to redistribute it under certain conditions; type `show c' for details. The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public License. Of course, the commands you use may be called something other than `show w' and `show c'; they could even be mouse-clicks or menu items--whatever suits your program. You should also get your employer (if you work as a programmer) or your school, if any, to sign a "copyright disclaimer" for the program, if necessary. Here is a sample; alter the names: Yoyodyne, Inc., hereby disclaims all copyright interest in the program `Gnomovision' (which makes passes at compilers) written by James Hacker. , 1 April 1989 Ty Coon, President of Vice This General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Lesser General Public License instead of this License. nodm-0.11/log.h0000644000175000017500000000453411605715173010257 00000000000000/* * log - print and/or log messages * * Copyright 2011 Enrico Zini * * 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., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #ifndef NODM_LOG_H #define NODM_LOG_H #include /// Logging configuration struct log_config { /// The program name to use in error messages const char* program_name; /// Log to syslog bool log_to_syslog; /// Log to stderr bool log_to_stderr; /** * Log level: * 1. errors * 2. warnings * 3. info * 4. verbose */ enum { NODM_LL_ERR = 1, NODM_LL_WARN = 2, NODM_LL_INFO = 3, NODM_LL_VERB = 4 } log_level; }; /** * Initialise log configuration with default values */ void log_config_init(struct log_config* conf); /** * Start the logging system * * @param conf * The logging configuration. Note that it only stores a copy of the pointer, * but does not make a copy of the structure, so you need to make sure that * the string remains valid until log_end() is called. */ void log_start(const struct log_config* conf); /** * Shut down the logging system. * * This should also be called after each fork. */ void log_end(); // Note: all log functions return true if the message was logged, false // otherwise. This can be used to test for log levels: if (log_verb(NULL)) { /* // complex debugging code */ } /// Log a message about the trivial normal progress of things bool log_verb(const char* fmt, ...); /// Log a message about the relevant normal progress of things bool log_info(const char* fmt, ...); /// Log a warning message bool log_warn(const char* fmt, ...); /// Log an error message bool log_err(const char* fmt, ...); #endif nodm-0.11/log.c0000644000175000017500000000554611605715173010256 00000000000000/* * log - print and/or log messages * * Copyright 2011 Enrico Zini * * 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., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include "log.h" #include #include #include #include static const struct log_config* config = 0; void log_config_init(struct log_config* conf) { conf->program_name = 0; conf->log_to_syslog = true; conf->log_to_stderr = true; conf->log_level = LOG_INFO; } void log_start(const struct log_config* conf) { config = conf; if (config->log_to_syslog) openlog("nodm", LOG_PID, LOG_AUTHPRIV); } void log_end() { if (config->log_to_syslog) closelog(); } static void log_common(int prio, const char* fmt, va_list ap) { if (config->log_to_stderr) { va_list loc; va_copy(loc, ap); struct timeval now; gettimeofday(&now, NULL); fprintf(stderr, "%u.%u %s:", (unsigned)now.tv_sec, (unsigned)now.tv_usec, config->program_name); vfprintf(stderr, fmt, loc); va_end(loc); fputc('\n', stderr); } if (config->log_to_syslog) { va_list loc; va_copy(loc, ap); vsyslog(prio, fmt, loc); va_end(loc); } } bool log_verb(const char* fmt, ...) { if (config->log_level < NODM_LL_VERB) return false; if (fmt == NULL) return true; va_list ap; va_start(ap, fmt); log_common(LOG_INFO, fmt, ap); va_end(ap); return true; } bool log_info(const char* fmt, ...) { if (config->log_level < NODM_LL_INFO) return false; if (fmt == NULL) return true; va_list ap; va_start(ap, fmt); log_common(LOG_NOTICE, fmt, ap); va_end(ap); return true; } bool log_warn(const char* fmt, ...) { if (config->log_level < NODM_LL_WARN) return false; if (fmt == NULL) return true; va_list ap; va_start(ap, fmt); log_common(LOG_WARNING, fmt, ap); va_end(ap); return true; } bool log_err(const char* fmt, ...) { if (config->log_level < NODM_LL_ERR) return false; if (fmt == NULL) return true; va_list ap; va_start(ap, fmt); log_common(LOG_ERR, fmt, ap); va_end(ap); return true; } nodm-0.11/INSTALL0000644000175000017500000002245011150562237010347 00000000000000Installation Instructions ************************* Copyright (C) 1994, 1995, 1996, 1999, 2000, 2001, 2002, 2004, 2005, 2006, 2007 Free Software Foundation, Inc. This file is free documentation; the Free Software Foundation gives unlimited permission to copy, distribute and modify it. Basic Installation ================== Briefly, the shell commands `./configure; make; make install' should configure, build, and install this package. The following more-detailed instructions are generic; see the `README' file for instructions specific to this package. The `configure' shell script attempts to guess correct values for various system-dependent variables used during compilation. It uses those values to create a `Makefile' in each directory of the package. It may also create one or more `.h' files containing system-dependent definitions. Finally, it creates a shell script `config.status' that you can run in the future to recreate the current configuration, and a file `config.log' containing compiler output (useful mainly for debugging `configure'). It can also use an optional file (typically called `config.cache' and enabled with `--cache-file=config.cache' or simply `-C') that saves the results of its tests to speed up reconfiguring. Caching is disabled by default to prevent problems with accidental use of stale cache files. If you need to do unusual things to compile the package, please try to figure out how `configure' could check whether to do them, and mail diffs or instructions to the address given in the `README' so they can be considered for the next release. If you are using the cache, and at some point `config.cache' contains results you don't want to keep, you may remove or edit it. The file `configure.ac' (or `configure.in') is used to create `configure' by a program called `autoconf'. You need `configure.ac' if you want to change it or regenerate `configure' using a newer version of `autoconf'. The simplest way to compile this package is: 1. `cd' to the directory containing the package's source code and type `./configure' to configure the package for your system. Running `configure' might take a while. While running, it prints some messages telling which features it is checking for. 2. Type `make' to compile the package. 3. Optionally, type `make check' to run any self-tests that come with the package. 4. Type `make install' to install the programs and any data files and documentation. 5. You can remove the program binaries and object files from the source code directory by typing `make clean'. To also remove the files that `configure' created (so you can compile the package for a different kind of computer), type `make distclean'. There is also a `make maintainer-clean' target, but that is intended mainly for the package's developers. If you use it, you may have to get all sorts of other programs in order to regenerate files that came with the distribution. 6. Often, you can also type `make uninstall' to remove the installed files again. Compilers and Options ===================== Some systems require unusual options for compilation or linking that the `configure' script does not know about. Run `./configure --help' for details on some of the pertinent environment variables. You can give `configure' initial values for configuration parameters by setting variables in the command line or in the environment. Here is an example: ./configure CC=c99 CFLAGS=-g LIBS=-lposix *Note Defining Variables::, for more details. Compiling For Multiple Architectures ==================================== You can compile the package for more than one kind of computer at the same time, by placing the object files for each architecture in their own directory. To do this, you can use GNU `make'. `cd' to the directory where you want the object files and executables to go and run the `configure' script. `configure' automatically checks for the source code in the directory that `configure' is in and in `..'. With a non-GNU `make', it is safer to compile the package for one architecture at a time in the source code directory. After you have installed the package for one architecture, use `make distclean' before reconfiguring for another architecture. Installation Names ================== By default, `make install' installs the package's commands under `/usr/local/bin', include files under `/usr/local/include', etc. You can specify an installation prefix other than `/usr/local' by giving `configure' the option `--prefix=PREFIX'. You can specify separate installation prefixes for architecture-specific files and architecture-independent files. If you pass the option `--exec-prefix=PREFIX' to `configure', the package uses PREFIX as the prefix for installing programs and libraries. Documentation and other data files still use the regular prefix. In addition, if you use an unusual directory layout you can give options like `--bindir=DIR' to specify different values for particular kinds of files. Run `configure --help' for a list of the directories you can set and what kinds of files go in them. If the package supports it, you can cause programs to be installed with an extra prefix or suffix on their names by giving `configure' the option `--program-prefix=PREFIX' or `--program-suffix=SUFFIX'. Optional Features ================= Some packages pay attention to `--enable-FEATURE' options to `configure', where FEATURE indicates an optional part of the package. They may also pay attention to `--with-PACKAGE' options, where PACKAGE is something like `gnu-as' or `x' (for the X Window System). The `README' should mention any `--enable-' and `--with-' options that the package recognizes. For packages that use the X Window System, `configure' can usually find the X include and library files automatically, but if it doesn't, you can use the `configure' options `--x-includes=DIR' and `--x-libraries=DIR' to specify their locations. Specifying the System Type ========================== There may be some features `configure' cannot figure out automatically, but needs to determine by the type of machine the package will run on. Usually, assuming the package is built to be run on the _same_ architectures, `configure' can figure that out, but if it prints a message saying it cannot guess the machine type, give it the `--build=TYPE' option. TYPE can either be a short name for the system type, such as `sun4', or a canonical name which has the form: CPU-COMPANY-SYSTEM where SYSTEM can have one of these forms: OS KERNEL-OS See the file `config.sub' for the possible values of each field. If `config.sub' isn't included in this package, then this package doesn't need to know the machine type. If you are _building_ compiler tools for cross-compiling, you should use the option `--target=TYPE' to select the type of system they will produce code for. If you want to _use_ a cross compiler, that generates code for a platform different from the build platform, you should specify the "host" platform (i.e., that on which the generated programs will eventually be run) with `--host=TYPE'. Sharing Defaults ================ If you want to set default values for `configure' scripts to share, you can create a site shell script called `config.site' that gives default values for variables like `CC', `cache_file', and `prefix'. `configure' looks for `PREFIX/share/config.site' if it exists, then `PREFIX/etc/config.site' if it exists. Or, you can set the `CONFIG_SITE' environment variable to the location of the site script. A warning: not all `configure' scripts look for a site script. Defining Variables ================== Variables not defined in a site shell script can be set in the environment passed to `configure'. However, some packages may run configure again during the build, and the customized values of these variables may be lost. In order to avoid this problem, you should set them in the `configure' command line, using `VAR=value'. For example: ./configure CC=/usr/local2/bin/gcc causes the specified `gcc' to be used as the C compiler (unless it is overridden in the site shell script). Unfortunately, this technique does not work for `CONFIG_SHELL' due to an Autoconf bug. Until the bug is fixed you can use this workaround: CONFIG_SHELL=/bin/bash /bin/bash ./configure CONFIG_SHELL=/bin/bash `configure' Invocation ====================== `configure' recognizes the following options to control how it operates. `--help' `-h' Print a summary of the options to `configure', and exit. `--version' `-V' Print the version of Autoconf used to generate the `configure' script, and exit. `--cache-file=FILE' Enable the cache: use and save the results of the tests in FILE, traditionally `config.cache'. FILE defaults to `/dev/null' to disable caching. `--config-cache' `-C' Alias for `--cache-file=config.cache'. `--quiet' `--silent' `-q' Do not print messages saying which checks are being made. To suppress all normal output, redirect it to `/dev/null' (any error messages will still be shown). `--srcdir=DIR' Look for the package's source code in directory DIR. Usually `configure' can determine that directory automatically. `configure' also accepts some other, not widely useful, options. Run `configure --help' for more details. nodm-0.11/nodm-man-extras0000644000175000017500000000137311150604060012243 00000000000000[DESCRIPTION] \fBnodm\fP is a minimal display manager that simply logs in as a given user and starts an X session, without asking for username or password. .P On a normal computer, using \fBnodm\fP is a big security issue because it would give anyone access to the computer. .P However, there are cases where automatic login is needed: for example in an embedded system such as a mobile phone, or in a kiosk setup, or in a control panel for industrial machinery. For those cases, \fBnodm\fP is simple to setup, lightweight, and it should do exactly the right thing. [AUTHOR] \fBnodm\fP is written and maintained by Enrico Zini and Joachim Breitner . [SEE ALSO] .BR xinit (1), .BR xdm (1), .BR gdm (1), .BR kdm (1). nodm-0.11/xserver.c0000644000175000017500000003234011611374167011164 00000000000000/* * xserver - X server startup functions * * Copyright 2011 Enrico Zini * * 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., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ /* * nodm_xserver_read_window_path is taken from xdm's dm.c which is: * * 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. */ #define _GNU_SOURCE #include "xserver.h" #include "common.h" #include "log.h" #include #include #include #include #include #include #include #include #include #include #include #include // Signal handlers static bool server_started = false; static void on_sigusr1(int sig) { server_started = true; } static void on_sigchld(int sig) {} void nodm_xserver_init(struct nodm_xserver* srv) { // Get the user we should run the session for srv->conf_timeout = atoi(getenv_with_default("NODM_X_TIMEOUT", "30")); srv->argv = 0; srv->name = 0; srv->pid = -1; srv->dpy = NULL; srv->windowpath = NULL; if (sigemptyset(&srv->orig_signal_mask) == -1) log_err("sigemptyset error: %m"); } int nodm_xserver_start(struct nodm_xserver* srv) { // Function return code int return_code = E_SUCCESS; // True if we should restore the signal mask at exit bool signal_mask_altered = false; // Initialise common signal handling machinery struct sigaction sa; sa.sa_flags = 0; if (sigemptyset(&sa.sa_mask) < 0) { log_err("sigemptyset failed: %m"); return E_PROGRAMMING; } // Take note of the old SIGCHLD handler struct sigaction sa_sigchld_old; if (sigaction(SIGCHLD, NULL, &sa_sigchld_old) == -1) { log_err("sigaction failed: %m"); return E_PROGRAMMING; } // Catch server ready notifications via SIGUSR1 struct sigaction sa_usr1_old; server_started = false; sa.sa_handler = on_sigusr1; if (sigaction(SIGUSR1, &sa, &sa_usr1_old) == -1) { log_err("sigaction failed: %m"); return E_PROGRAMMING; } // From now on we need to perform cleanup before returning if (log_verb(NULL)) { // Log the concatenated command line char buf[4096]; int pos = 0; const char** s = srv->argv; for ( ; *s && pos < 4096; ++s) { int r = snprintf(buf + pos, 4096 - pos, " %s", *s); if (r < 0) break; pos += r; } log_verb("starting X server %s", buf); } // fork/exec the X server srv->pid = fork (); if (srv->pid == 0) { // child // Restore the original signal mask if (sigprocmask(SIG_SETMASK, &srv->orig_signal_mask, NULL) == -1) log_err("sigprocmask failed: %m"); // Stop the logging subsystem before we quit via exec log_end(); // don't hang on read/write to control tty (from xinit) signal(SIGTTIN, SIG_IGN); signal(SIGTTOU, SIG_IGN); // Ignore SIGUSR1 to signal the X server that it should send us SIGUSR1 // when ready signal(SIGUSR1, SIG_IGN); // prevent the server from getting sighup from vhangup() (from xinit) setpgid(0, getpid()); execv(srv->argv[0], (char *const*)srv->argv); log_err("cannot start %s: %m", srv->argv[0]); exit(errno == ENOENT ? E_CMD_NOTFOUND : E_CMD_NOEXEC); } else if (srv->pid == -1) { log_err("cannot fork to run %s: %m", srv->argv[0]); return_code = E_OS_ERROR; goto cleanup; } // Get notified on sigchld, so nanosleep later will exit with EINTR if the // X server dies. If the server died before we set this signal handler, // that's fine, since waitpid will notice it anyway sa.sa_handler = on_sigchld; if (sigaction(SIGCHLD, &sa, NULL) == -1) { log_err("sigaction failed: %m"); return_code = E_PROGRAMMING; goto cleanup; } // Unblock SIGCHLD and SIGUSR1 sigset_t orig_set; sigset_t cur_set; if (sigemptyset(&cur_set) == -1) { log_err("sigemptyset failed: %m"); return_code = E_PROGRAMMING; goto cleanup; } if (sigaddset(&cur_set, SIGCHLD) == -1 || sigaddset(&cur_set, SIGUSR1) == -1) { log_err("sigaddset failed: %m"); return_code = E_PROGRAMMING; goto cleanup; } if (sigprocmask(SIG_UNBLOCK, &cur_set, &orig_set) == -1) { log_err("sigprocmask failed: %m"); return_code = E_PROGRAMMING; goto cleanup; } signal_mask_altered = true; // Wait for SIGUSR1, for the server to die or for a timeout struct timespec timeout = { .tv_sec = srv->conf_timeout, .tv_nsec = 0 }; while (!server_started) { // Check if the server has died int status; pid_t res = waitpid(srv->pid, &status, WNOHANG); if (res == -1) { if (errno == EINTR) continue; log_err("waitpid on %s failed: %m", srv->argv[0]); return_code = E_OS_ERROR; goto cleanup; } if (res == srv->pid) { nodm_xserver_report_exit(srv, status); srv->pid = -1; return_code = E_X_SERVER_DIED; goto cleanup; } // Wait some time for something to happen struct timespec rem; if (nanosleep(&timeout, &rem) == -1) { if (errno == EINTR) { timeout = rem; continue; } log_err("nanosleep failed: %m"); return_code = E_OS_ERROR; goto cleanup; } else { log_err("X server did not respond after %u seconds", srv->conf_timeout); return_code = E_X_SERVER_TIMEOUT; goto cleanup; } } log_verb("X is ready to accept connections"); return_code = nodm_xserver_connect(srv); if (return_code != E_SUCCESS) goto cleanup; cleanup: // Restore signal mask if (signal_mask_altered) if (sigprocmask(SIG_SETMASK, &orig_set, NULL) == -1) log_err("sigprocmask failed: %m"); // Kill the X server if an error happened if (srv->pid > 0 && return_code != E_SUCCESS) nodm_xserver_stop(srv); // Restore signal handlers sigaction(SIGCHLD, NULL, &sa_sigchld_old); sigaction(SIGUSR1, NULL, &sa_usr1_old); return return_code; } int nodm_xserver_stop(struct nodm_xserver* srv) { nodm_xserver_disconnect(srv); int res = child_must_exit(srv->pid, "X server"); srv->pid = -1; if (srv->windowpath != NULL) { free(srv->windowpath); srv->windowpath = NULL; } return res; } static int xopendisplay_error_handler(Display* dpy) { log_err("I/O error in XOpenDisplay"); log_end(); exit(E_XLIB_ERROR); } /* static int x_error_handler(Display* dpy, XErrorEvent* e) { log_err("X error"); return 0; } */ int nodm_xserver_connect(struct nodm_xserver* srv) { log_verb("connecting to X server"); //XSetErrorHandler(x_error_handler); for (int i = 0; i < 5; ++i) { if (i > 0) log_info("connecting to X server, attempt #%d", i+1); XSetIOErrorHandler(xopendisplay_error_handler); srv->dpy = XOpenDisplay(srv->name); XSetIOErrorHandler((int (*)(Display *))0); if (srv->dpy == NULL) { log_err("could not connect to X server on \"%s\"", srv->name); sleep(1); } else break; } // from xdm: remove close-on-exec and register to close at the next fork, why? We'll find out // RegisterCloseOnFork (ConnectionNumber (d->dpy)); // fcntl (ConnectionNumber (d->dpy), F_SETFD, 0); return srv->dpy == NULL ? E_X_SERVER_CONNECT : E_SUCCESS; } static jmp_buf close_env; static int ignorexio(Display *dpy) { longjmp(close_env, 1); // Not reached return 0; } int nodm_xserver_disconnect(struct nodm_xserver* srv) { log_verb("disconnecting from X server"); // TODO: get/check pending errors (how?) if (srv->dpy != NULL) { XSetIOErrorHandler(ignorexio); if (! setjmp(close_env)) XCloseDisplay(srv->dpy); else log_warn("I/O error on display close"); XSetIOErrorHandler(NULL); srv->dpy = NULL; } return E_SUCCESS; } int nodm_xserver_read_window_path(struct nodm_xserver* srv) { /* setting WINDOWPATH for clients */ Atom prop; Atom actualtype; int actualformat; unsigned long nitems; unsigned long bytes_after; unsigned char *buf; const char *windowpath; char *newwindowpath; unsigned long num; log_verb("reading WINDOWPATH value from server"); prop = XInternAtom(srv->dpy, "XFree86_VT", False); if (prop == None) { log_err("no XFree86_VT atom"); return E_XLIB_ERROR; } if (XGetWindowProperty(srv->dpy, DefaultRootWindow(srv->dpy), prop, 0, 1, False, AnyPropertyType, &actualtype, &actualformat, &nitems, &bytes_after, &buf)) { log_err("no XFree86 VT property"); return E_XLIB_ERROR; } if (nitems == 0) num = DefaultRootWindow(srv->dpy); else { if (nitems != 1) { log_err("%lu!=1 items in XFree86_VT property", nitems); XFree(buf); return E_XLIB_ERROR; } switch (actualtype) { case XA_CARDINAL: case XA_INTEGER: case XA_WINDOW: switch (actualformat) { case 8: num = (*(uint8_t *)(void *)buf); break; case 16: num = (*(uint16_t *)(void *)buf); break; case 32: num = (*(uint32_t *)(void *)buf); break; default: log_err("unsupported format %d in XFree86_VT property", actualformat); XFree(buf); return E_XLIB_ERROR; } break; default: log_err("unsupported type %lx in XFree86_VT property", actualtype); XFree(buf); return E_XLIB_ERROR; } } XFree(buf); windowpath = getenv("WINDOWPATH"); if (!windowpath) asprintf(&newwindowpath, "%lu", num); else asprintf(&newwindowpath, "%s:%lu", windowpath, num); if (srv->windowpath) free(srv->windowpath); srv->windowpath = newwindowpath; log_verb("WINDOWPATH: %s", srv->windowpath); return E_SUCCESS; } void nodm_xserver_dump_status(struct nodm_xserver* srv) { fprintf(stderr, "xserver start timeout: %d\n", srv->conf_timeout); fprintf(stderr, "xserver command line:"); for (const char** s = srv->argv; *s; ++s) fprintf(stderr, " %s", *s); fputc('\n', stderr); fprintf(stderr, "xserver name: %s\n", srv->name); fprintf(stderr, "xserver window path: %s\n", srv->windowpath); fprintf(stderr, "xserver PID: %d\n", (int)srv->pid); fprintf(stderr, "xserver connected: %s\n", (srv->dpy != NULL) ? "yes" : "no"); } void nodm_xserver_report_exit(struct nodm_xserver* s, int status) { if (WIFEXITED(status)) log_warn("X server %d quit with status %d", (int)s->pid, WEXITSTATUS(status)); else if (WIFSIGNALED(status)) log_err("X server %d was killed with signal %d", (int)s->pid, WTERMSIG(status)); else log_err("X server %d terminated with unknown status %d", (int)s->pid, status); } nodm-0.11/Makefile.am0000644000175000017500000000174711605344003011352 00000000000000## Process this file with automake to produce Makefile.in CFLAGS += -Wall -Werror ACLOCAL_AMFLAGS = -I m4 sbin_PROGRAMS = nodm dist_noinst_HEADERS = common.h dm.h log.h test.h vt.h xserver.h xsession.h xsession-child.h libsources = common.c log.c vt.c xsession-child.c xserver.c xsession.c dm.c testlibsources = $(libsources) test.c AM_CPPFLAGS = $(X11_CFLAGS) AM_LDFLAGS = $(PAM_LIBS) $(X11_LIBS) nodm_SOURCES = $(libsources) nodm.c nodm_CFLAGS = -DNODM_SESSION='"$(sbindir)/nodm"' nodm.8: nodm help2man --section=8 --name="X display manager for automatic logins" \ --no-info --include=nodm-man-extras ./$< > $@ man_MANS = nodm.8 TESTS = test-internals test-xstart test-xsession check_PROGRAMS = test-internals test-xstart test-xsession test_xstart_SOURCES = $(testlibsources) test-xstart.c test_xsession_SOURCES = $(testlibsources) test-xsession.c test_internals_SOURCES = $(testlibsources) test-internals.c EXTRA_DIST = test_nodm nodm-man-extras autogen.sh CLEANFILES = nodm.8 nodm-0.11/xsession.h0000644000175000017500000000411611605640616011344 00000000000000/* * xsession - nodm X session * * Copyright 2011 Enrico Zini * * 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., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #ifndef NODM_SESSION_H #define NODM_SESSION_H #include #include struct nodm_xserver; struct nodm_xsession_child; /// Supervise an X session struct nodm_xsession { /// Command to run as the X session char conf_session_command[1024]; /** * Username to use for the X session. * * Empty string means 'do not change user' */ char conf_run_as[128]; /// If true, wrap the session in a PAM session bool conf_use_pam; /// If set to true, perform ~/.xsession-errors cleanup bool conf_cleanup_xse; /// X session pid pid_t pid; /// If non-NULL, use as child process main body (used for tests) int (*child_body)(struct nodm_xsession_child* s); /// Original signal mask at program startup sigset_t orig_signal_mask; }; /// Initialise a struct nodm_session with default values int nodm_xsession_init(struct nodm_xsession* s); /// Start the X session int nodm_xsession_start(struct nodm_xsession* s, struct nodm_xserver* srv); /// Stop the X session int nodm_xsession_stop(struct nodm_xsession* s); /// Dump all internal status to stderr void nodm_xsession_dump_status(struct nodm_xsession* s); /// Report that the X session has quit void nodm_xsession_report_exit(struct nodm_xsession* s, int status); #endif nodm-0.11/xsession.c0000644000175000017500000001245511606020530011330 00000000000000/* * xsession - nodm X session * * Copyright 2011 Enrico Zini * * 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., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include "xsession.h" #include "xsession-child.h" #include "xserver.h" #include "log.h" #include "common.h" #include #include #include #include #include #include #include #include #include int nodm_xsession_init(struct nodm_xsession* s) { s->child_body = NULL; s->conf_use_pam = true; s->conf_cleanup_xse = true; if (sigemptyset(&s->orig_signal_mask) == -1) log_err("sigemptyset error: %m"); // Get the user we should run the session for if (!bounded_strcpy(s->conf_run_as, getenv_with_default("NODM_USER", "root"))) log_warn("username has been truncated"); // Get the X session command if (!bounded_strcpy(s->conf_session_command, getenv_with_default("NODM_XSESSION", "/etc/X11/Xsession"))) log_warn("session command has been truncated"); s->pid = -1; return E_SUCCESS; } int nodm_xsession_start(struct nodm_xsession* s, struct nodm_xserver* srv) { struct nodm_xsession_child child; child.srv = srv; child.conf_cleanup_xse = s->conf_cleanup_xse; // Validate the user using the normal system user database struct passwd *pw = 0; if (s->conf_run_as[0] == 0) pw = getpwuid(getuid()); else pw = getpwnam(s->conf_run_as); if (pw == NULL) { log_err("unknown username: %s", s->conf_run_as); return E_OS_ERROR; } child.pwent = *pw; // Create the argument list const char* args[5]; args[0] = "/bin/sh"; args[1] = "-l"; args[2] = "-c"; args[3] = s->conf_session_command; args[4] = NULL; child.argv = args; log_verb("starting X session \"%s\"", s->conf_session_command); // Variables that gdm sets but we do not: // // This is something that we should see how to handle. // What I know so far is: // - It should point to ~/.Xauthority, which should exist. // - 'xauth generate' should be able to create it if missing, but I // have not tested it yet. // g_setenv ("XAUTHORITY", d->userauth, TRUE); // // This is 'gnome', 'kde' and so on, and should probably be set by the // X session script: // g_setenv ("DESKTOP_SESSION", session, TRUE); // // This looks gdm specific: // g_setenv ("GDMSESSION", session, TRUE); // Variables that gdm sets but we delegate other tools to set: // // This is set by the pam_getenvlist loop above // g_setenv ("XDG_SESSION_COOKIE", ck_session_cookie, TRUE); // // This is set by "sh -l" from /etc/profile // if (pwent->pw_uid == 0) // g_setenv ("PATH", gdm_daemon_config_get_value_string (GDM_KEY_ROOT_PATH), TRUE); // else // g_setenv ("PATH", gdm_daemon_config_get_value_string (GDM_KEY_PATH), TRUE); // s->pid = fork(); if (s->pid == 0) { // Restore the original signal mask if (sigprocmask(SIG_SETMASK, &s->orig_signal_mask, NULL) == -1) log_err("sigprocmask failed: %m"); // cargogulted from xinit setpgid(0, getpid()); // child shell */ if (s->child_body) exit(s->child_body(&child)); else if (s->conf_use_pam) exit(nodm_xsession_child_pam(&child)); else exit(nodm_xsession_child(&child)); } else if (s->pid == -1) { log_err("cannot fork user shell: %m"); return E_OS_ERROR; } return E_SUCCESS; } int nodm_xsession_stop(struct nodm_xsession* s) { int res = child_must_exit(s->pid, "X session"); s->pid = -1; return res; } void nodm_xsession_dump_status(struct nodm_xsession* s) { fprintf(stderr, "xsession command: %s\n", s->conf_session_command); fprintf(stderr, "xsession user: %s\n", s->conf_run_as); fprintf(stderr, "xsession use PAM: %s\n", s->conf_use_pam ? "yes" : "no"); fprintf(stderr, "xsession cleanup ~/.xsession-errors: %s\n", s->conf_cleanup_xse ? "yes" : "no"); fprintf(stderr, "xsession pid: %d\n", (int)s->pid); fprintf(stderr, "xsession body overridden by test: %s\n", (s->child_body != NULL) ? "yes" : "no"); } void nodm_xsession_report_exit(struct nodm_xsession* s, int status) { if (WIFEXITED(status)) log_warn("X session %d quit with status %d", (int)s->pid, WEXITSTATUS(status)); else if (WIFSIGNALED(status)) log_warn("X session %d was killed with signal %d", (int)s->pid, WTERMSIG(status)); else log_warn("X session %d terminated with unknown status %d", (int)s->pid, status); } nodm-0.11/test.c0000644000175000017500000000563211605705301010440 00000000000000/* * test - nodm test utilities * * Copyright 2011 Enrico Zini * * 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., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include "test.h" #include "common.h" #include "dm.h" #include #include #include #include #include void test_setup_dm(struct nodm_display_manager* dm, const char* xcmdline) { bool run_nested = getenv("DISPLAY") != NULL; bool is_root = getuid() == 0; nodm_display_manager_init(dm); if (xcmdline == NULL) { if (run_nested) xcmdline = "/usr/bin/Xnest :1 -geometry 1x1+0+0"; else xcmdline = ""; } ensure_succeeds(nodm_display_manager_parse_xcmdline(dm, xcmdline)); if (is_root) strcpy(dm->session.conf_run_as, "root"); else { dm->session.conf_use_pam = false; dm->session.conf_cleanup_xse = false; dm->session.conf_run_as[0] = 0; dm->vt.conf_initial_vt = -1; } } void test_start(const char* testname, bool verbose) { static struct log_config cfg; cfg.program_name = testname, cfg.log_to_syslog = false, cfg.log_to_stderr = true, cfg.log_level = NODM_LL_INFO; cfg.log_level = NODM_LL_VERB; log_start(&cfg); } void test_fail() { log_end(); exit(E_PROGRAMMING); } void test_ok() { log_end(); exit(0); } void ensure_equals(const char* a, const char* b) { if (a == NULL && b == NULL) return; if (a == NULL || b == NULL || strcmp(a, b) != 0) { log_warn("strings differ: \"%s\" != \"%s\"", a, b); test_fail(); } } void ensure_not_equals(const char* a, const char* b) { if (a == NULL && b == NULL) { log_warn("strings are both NULL"); test_fail(); } if (a != NULL && b != NULL && strcmp(a, b) == 0) { log_warn("strings are both \"%s\"", a); test_fail(); } } void ensure_equali(int a, int b) { if (a != b) { log_warn("values differ: %d != %d", a, b); test_fail(); } } void _ensure_succeeds(int code, const char* file, int line, const char* desc) { if (code != E_SUCCESS) { log_err("%s:%d:%s failed with code %d (%s)", file, line, desc, code, nodm_strerror(code)); test_fail(); } } nodm-0.11/dm.h0000644000175000017500000000650611605342762010077 00000000000000/* * dm - nodm X display manager * * Copyright 2011 Enrico Zini * * 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., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #ifndef NODM_DISPLAY_MANAGER_H #define NODM_DISPLAY_MANAGER_H #include "xserver.h" #include "xsession.h" #include "vt.h" #include #include struct nodm_display_manager { /// X server supervision struct nodm_xserver srv; /// X session supervision struct nodm_xsession session; /// VT allocation struct nodm_vt vt; /** * The minimum time (in seconds) that a session should last to be * considered successful */ int conf_minimum_session_time; /// Time the last session started time_t last_session_start; /// Original signal mask at program startup sigset_t orig_signal_mask; /// Storage for split server arguments used by nodm_x_cmdline_split char** _srv_split_argv; void* _srv_split_args; /// Storage for vtN argument from dynamic VT allocation char _vtarg[10]; }; /// Initialise a display_manager structure with default values void nodm_display_manager_init(struct nodm_display_manager* dm); /// Cleanup at the end of the display manager void nodm_display_manager_cleanup(struct nodm_display_manager* dm); /** * Start X and the X session * * This function sets the signal mask to block all signals. The original signal * mask is restored by nodm_display_manager_cleanup(). */ int nodm_display_manager_start(struct nodm_display_manager* dm); /// Restart X and the X session after they died int nodm_display_manager_restart(struct nodm_display_manager* dm); /// Wait for X or the X session to end int nodm_display_manager_wait(struct nodm_display_manager* dm, int* session_status); /// Stop X and the X session int nodm_display_manager_stop(struct nodm_display_manager* dm); /** * nodm wait/restart loop. * * Wait for the X server or session to terminate and restart them. * * If the session was very short-lived, it wants for an incremental amount of * time before restarting it. */ int nodm_display_manager_wait_restart_loop(struct nodm_display_manager* dm); /** * Split xcmdline using wordexp shell-like expansion and set dm->srv.argv. * * If the first token starts with '/' or '.', it is used as the X server, else * "X" is used as the server. * * If the second token (or the first if the first was not recognised as a path * to the X server) looks like ":", it is used as the display name, * else ":0" is used. */ int nodm_display_manager_parse_xcmdline(struct nodm_display_manager* dm, const char* xcmdline); /// Dump all internal status to stderr void nodm_display_manager_dump_status(struct nodm_display_manager* dm); #endif nodm-0.11/nodm.c0000644000175000017500000001310711605704623010420 00000000000000/* * nodm - nodm X display manager * * Copyright 2009--2011 Enrico Zini * * 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., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #define NAME "nodm" #ifndef NODM_SESSION #define NODM_SESSION "/usr/sbin/nodm" #endif /* #define DEBUG_NODM */ #include "config.h" #include "common.h" #include "dm.h" #include "log.h" #include #include #include #include #include #include #include #include #include static void do_help(int argc, char** argv, FILE* out) { fprintf(out, "Usage: %s [options]\n\n", argv[0]); fprintf(out, "Options:\n"); fprintf(out, " --help print this help message\n"); fprintf(out, " --version print %s's version number\n", NAME); fprintf(out, " --verbose verbose outpout or logging\n"); fprintf(out, " --quiet only log warnings and errors\n"); fprintf(out, " --nested run a nested X server, does not require root."); fprintf(out, " The server defaults to \"/usr/bin/Xnest :1\","); fprintf(out, " override with NODM_X_OPTIONS\n"); fprintf(out, " --[no-]syslog enable/disable logging to syslog\n"); fprintf(out, " --[no-]stderr enable/disable logging to stderr\n"); } /* * nodm - start X with autologin to a given user * * First, X is started as root, and nodm itself is used as the session. * * When run as the session, nodm performs a proper login to a given user and * starts the X session. */ int main (int argc, char **argv) { static int opt_help = 0; static int opt_version = 0; static int opt_verbose = 0; static int opt_quiet = 0; static int opt_nested = 0; static int opt_log_syslog = -1; // -1 for 'default' static int opt_log_stderr = -1; // -1 for 'default' static struct option options[] = { /* These options set a flag. */ {"help", no_argument, &opt_help, 1}, {"version", no_argument, &opt_version, 1}, {"verbose", no_argument, &opt_verbose, 1}, {"quiet", no_argument, &opt_quiet, 1}, {"nested", no_argument, &opt_nested, 1}, {"syslog", no_argument, &opt_log_syslog, 1}, {"stderr", no_argument, &opt_log_stderr, 1}, {"no-syslog", no_argument, &opt_log_syslog, 0}, {"no-stderr", no_argument, &opt_log_stderr, 0}, {0, 0, 0, 0} }; // Parse command line options while (1) { int option_index = 0; int c = getopt_long(argc, argv, ":", options, &option_index); if (c == -1) break; switch (c) { case 0: break; default: fprintf(stderr, "Invalid command line option\n"); do_help(argc, argv, stderr); return E_USAGE; } } if (opt_help) { do_help(argc, argv, stdout); return E_SUCCESS; } if (opt_version) { printf("%s version %s\n", NAME, VERSION); return E_SUCCESS; } // We only run if we are root if (!opt_nested && getuid() != 0) { fprintf(stderr, "%s: can only be run by root\n", basename(argv[0])); return E_NOPERM; } // Setup logging struct log_config cfg = { .program_name = basename(argv[0]), }; if (opt_quiet) cfg.log_level = NODM_LL_WARN; else if (opt_verbose) cfg.log_level = NODM_LL_VERB; else cfg.log_level = NODM_LL_INFO; if (opt_nested) { if (opt_log_syslog == -1) opt_log_syslog = 0; if (opt_log_stderr == -1) opt_log_stderr = 1; } else { if (opt_log_syslog == -1) opt_log_syslog = 1; if (opt_log_stderr == -1) opt_log_stderr = 0; } cfg.log_to_syslog = opt_log_syslog ? true : false; cfg.log_to_stderr = opt_log_stderr ? true : false; log_start(&cfg); log_info("starting nodm"); // Setup the display manager struct nodm_display_manager dm; nodm_display_manager_init(&dm); // Choose the default X server const char* default_x_server = opt_nested ? "/usr/bin/Xnest :1" : ""; // Parse X server command line int res = nodm_display_manager_parse_xcmdline(&dm, getenv_with_default("NODM_X_OPTIONS", default_x_server)); if (res != E_SUCCESS) goto cleanup; if (opt_nested) { // For nested servers, disable PAM, user change, ~/.xsession-error // cleanup and VT allocation dm.session.conf_use_pam = false; dm.session.conf_cleanup_xse = false; dm.session.conf_run_as[0] = 0; dm.vt.conf_initial_vt = -1; } // Start the first session res = nodm_display_manager_start(&dm); if (res != E_SUCCESS) goto cleanup; // Enter the wait/restart loop res = nodm_display_manager_wait_restart_loop(&dm); if (res != E_SUCCESS) goto cleanup; cleanup: nodm_display_manager_cleanup(&dm); log_end(); return res; } nodm-0.11/test-internals.c0000644000175000017500000001564011606011630012431 00000000000000/* * test-internals - test nodm internals and helper functions * * Copyright 2011 Enrico Zini * * 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., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include "log.h" #include "common.h" #include "dm.h" #include "test.h" #include #include #include int main(int argc, char* argv[]) { test_start("test-internals", false); // Test getenv_with_default setenv("FOO", "foo", 1); ensure_equals(getenv_with_default("FOO", "bar"), "foo"); unsetenv("FOO"); ensure_equals(getenv_with_default("FOO", "bar"), "bar"); struct nodm_display_manager s; nodm_display_manager_init(&s); nodm_display_manager_parse_xcmdline(&s, ""); ensure_equals(s.srv.argv[0], "/usr/bin/X"); ensure_equals(s.srv.argv[1], ":0"); ensure_equals(s.srv.argv[2], "-nolisten"); ensure_equals(s.srv.argv[3], "tcp"); ensure_equals(s.srv.argv[4], NULL); ensure_equals(s.srv.name, ":0"); ensure_equali(s.vt.conf_initial_vt, 7); nodm_display_manager_cleanup(&s); nodm_display_manager_init(&s); nodm_display_manager_parse_xcmdline(&s, "foo"); ensure_equals(s.srv.argv[0], "/usr/bin/X"); ensure_equals(s.srv.argv[1], ":0"); ensure_equals(s.srv.argv[2], "foo"); ensure_equals(s.srv.argv[3], "-nolisten"); ensure_equals(s.srv.argv[4], "tcp"); ensure_equals(s.srv.argv[5], NULL); ensure_equals(s.srv.name, ":0"); ensure_equali(s.vt.conf_initial_vt, 7); nodm_display_manager_cleanup(&s); nodm_display_manager_init(&s); nodm_display_manager_parse_xcmdline(&s, "/usr/bin/Xnest"); ensure_equals(s.srv.argv[0], "/usr/bin/Xnest"); ensure_equals(s.srv.argv[1], ":0"); ensure_equals(s.srv.argv[2], "-nolisten"); ensure_equals(s.srv.argv[3], "tcp"); ensure_equals(s.srv.argv[4], NULL); ensure_equals(s.srv.name, ":0"); ensure_equali(s.vt.conf_initial_vt, 7); nodm_display_manager_cleanup(&s); nodm_display_manager_init(&s); nodm_display_manager_parse_xcmdline(&s, ":1"); ensure_equals(s.srv.argv[0], "/usr/bin/X"); ensure_equals(s.srv.argv[1], ":1"); ensure_equals(s.srv.argv[2], "-nolisten"); ensure_equals(s.srv.argv[3], "tcp"); ensure_equals(s.srv.argv[4], NULL); ensure_equals(s.srv.name, ":1"); ensure_equali(s.vt.conf_initial_vt, 7); nodm_display_manager_cleanup(&s); nodm_display_manager_init(&s); nodm_display_manager_parse_xcmdline(&s, "/usr/bin/Xnest :1"); ensure_equals(s.srv.argv[0], "/usr/bin/Xnest"); ensure_equals(s.srv.argv[1], ":1"); ensure_equals(s.srv.argv[2], "-nolisten"); ensure_equals(s.srv.argv[3], "tcp"); ensure_equals(s.srv.argv[4], NULL); ensure_equals(s.srv.name, ":1"); ensure_equali(s.vt.conf_initial_vt, 7); nodm_display_manager_cleanup(&s); nodm_display_manager_init(&s); nodm_display_manager_parse_xcmdline(&s, "/usr/bin/Xnest foo"); ensure_equals(s.srv.argv[0], "/usr/bin/Xnest"); ensure_equals(s.srv.argv[1], ":0"); ensure_equals(s.srv.argv[2], "foo"); ensure_equals(s.srv.argv[3], "-nolisten"); ensure_equals(s.srv.argv[4], "tcp"); ensure_equals(s.srv.argv[5], NULL); ensure_equals(s.srv.name, ":0"); ensure_equali(s.vt.conf_initial_vt, 7); nodm_display_manager_cleanup(&s); nodm_display_manager_init(&s); nodm_display_manager_parse_xcmdline(&s, ":1 foo"); ensure_equals(s.srv.argv[0], "/usr/bin/X"); ensure_equals(s.srv.argv[1], ":1"); ensure_equals(s.srv.argv[2], "foo"); ensure_equals(s.srv.argv[3], "-nolisten"); ensure_equals(s.srv.argv[4], "tcp"); ensure_equals(s.srv.argv[5], NULL); ensure_equals(s.srv.name, ":1"); ensure_equali(s.vt.conf_initial_vt, 7); nodm_display_manager_cleanup(&s); nodm_display_manager_init(&s); nodm_display_manager_parse_xcmdline(&s, "/usr/bin/Xnest :1 foo"); ensure_equals(s.srv.argv[0], "/usr/bin/Xnest"); ensure_equals(s.srv.argv[1], ":1"); ensure_equals(s.srv.argv[2], "foo"); ensure_equals(s.srv.argv[3], "-nolisten"); ensure_equals(s.srv.argv[4], "tcp"); ensure_equals(s.srv.argv[5], NULL); ensure_equals(s.srv.name, ":1"); ensure_equali(s.vt.conf_initial_vt, 7); nodm_display_manager_cleanup(&s); nodm_display_manager_init(&s); nodm_display_manager_parse_xcmdline(&s, "vt2"); ensure_equals(s.srv.argv[0], "/usr/bin/X"); ensure_equals(s.srv.argv[1], ":0"); ensure_equals(s.srv.argv[2], "vt2"); ensure_equals(s.srv.argv[3], "-nolisten"); ensure_equals(s.srv.argv[4], "tcp"); ensure_equals(s.srv.argv[5], NULL); ensure_equals(s.srv.name, ":0"); ensure_equali(s.vt.conf_initial_vt, -1); nodm_display_manager_cleanup(&s); nodm_display_manager_init(&s); nodm_display_manager_parse_xcmdline(&s, "/usr/bin/Xnest :1 vt42 foo"); ensure_equals(s.srv.argv[0], "/usr/bin/Xnest"); ensure_equals(s.srv.argv[1], ":1"); ensure_equals(s.srv.argv[2], "vt42"); ensure_equals(s.srv.argv[3], "foo"); ensure_equals(s.srv.argv[4], "-nolisten"); ensure_equals(s.srv.argv[5], "tcp"); ensure_equals(s.srv.argv[6], NULL); ensure_equals(s.srv.name, ":1"); ensure_equali(s.vt.conf_initial_vt, -1); nodm_display_manager_cleanup(&s); nodm_display_manager_init(&s); nodm_display_manager_parse_xcmdline(&s, "/usr/bin/Xnest :1 vt42 -nolisten foo"); ensure_equals(s.srv.argv[0], "/usr/bin/Xnest"); ensure_equals(s.srv.argv[1], ":1"); ensure_equals(s.srv.argv[2], "vt42"); ensure_equals(s.srv.argv[3], "-nolisten"); ensure_equals(s.srv.argv[4], "foo"); ensure_equals(s.srv.argv[5], "-nolisten"); ensure_equals(s.srv.argv[6], "tcp"); ensure_equals(s.srv.argv[7], NULL); ensure_equals(s.srv.name, ":1"); ensure_equali(s.vt.conf_initial_vt, -1); nodm_display_manager_cleanup(&s); nodm_display_manager_init(&s); nodm_display_manager_parse_xcmdline(&s, "/usr/bin/Xnest :1 vt42 -nolisten tcp foo"); ensure_equals(s.srv.argv[0], "/usr/bin/Xnest"); ensure_equals(s.srv.argv[1], ":1"); ensure_equals(s.srv.argv[2], "vt42"); ensure_equals(s.srv.argv[3], "-nolisten"); ensure_equals(s.srv.argv[4], "tcp"); ensure_equals(s.srv.argv[5], "foo"); ensure_equals(s.srv.argv[6], NULL); ensure_equals(s.srv.name, ":1"); ensure_equali(s.vt.conf_initial_vt, -1); nodm_display_manager_cleanup(&s); test_ok(); } nodm-0.11/configure.ac0000644000175000017500000000140411622726274011607 00000000000000dnl Process this file with autoconf to produce a configure script. AC_INIT(nodm, 0.11, [enrico@enricozini.org, nomeata@debian.org]) AC_CONFIG_SRCDIR([configure.ac]) AC_CONFIG_AUX_DIR([config]) AM_INIT_AUTOMAKE([-Wall std-options foreign]) AM_CONFIG_HEADER(config.h) AC_CONFIG_MACRO_DIR([m4]) dnl AC_GNU_SOURCE dnl AM_MAINTAINER_MODE dnl Checks for programs. AC_PROG_CC AC_ISC_POSIX dnl We use C99 AC_PROG_CC_C99 dnl Checks for header files. AC_HEADER_STDC dnl Checks for libraries. PKG_CHECK_MODULES(X11, x11) AC_CHECK_LIB(pam, pam_start, [ PAM_LIBS="-lpam" ], AC_MSG_ERROR(libpam is missing) ) AC_CHECK_LIB(pam_misc, main, [ PAM_LIBS="$PAM_LIBS -lpam_misc" ], AC_MSG_ERROR(libpam_misc is missing) ) AC_SUBST(PAM_LIBS) AC_CONFIG_FILES([ Makefile ]) AC_OUTPUT nodm-0.11/vt.c0000644000175000017500000000550711605342762010123 00000000000000/* * vt - VT allocation * * Copyright 2009--2011 Enrico Zini * * 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., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include "vt.h" #include "common.h" #include "log.h" #include #include #include #include #include #include #include #include #include /** * Issue a VT_GETSTATE ioctl on the given device, if it supports it. * * @return true if it succeeded, false otherwise */ static bool try_vtstate(const char* dev, struct vt_stat* vtstat) { bool res = false; int fd = open(dev, O_WRONLY | O_NOCTTY, 0); if (fd < 0) goto cleanup; if (ioctl (fd, VT_GETSTATE, vtstat) < 0) goto cleanup; res = true; cleanup: if (fd >= 0) close(fd); return res; } // Find a device that supports the VT_GETSTATE ioctl static bool get_vtstate(struct vt_stat* vtstat) { if (try_vtstate("/dev/tty", vtstat)) return true; if (try_vtstate("/dev/tty0", vtstat)) return true; if (try_vtstate("/dev/console", vtstat)) return true; return false; } void nodm_vt_init(struct nodm_vt* vt) { vt->conf_initial_vt = strtol(getenv_with_default("NODM_FIRST_VT", "7"), NULL, 10); vt->fd = -1; vt->num = -1; } int nodm_vt_start(struct nodm_vt* vt) { if (vt->conf_initial_vt == -1) return E_SUCCESS; int vtnum = vt->conf_initial_vt; struct vt_stat vtstat; if (!get_vtstate(&vtstat)) { log_err("cannot find or open the console"); return E_VT_ALLOC_ERROR; } unsigned short vtmask; for (vtmask = 1 << vtnum; vtstat.v_state & vtmask; ++vtnum, vtmask <<= 1) ; if (!vtmask) { log_err("all VTs seem to be busy"); return E_VT_ALLOC_ERROR; } char vtname[15]; snprintf(vtname, 15, "/dev/tty%d", vtnum); vt->fd = open(vtname, O_RDWR | O_NOCTTY, 0); if (vt->fd < 0) { log_err("cannot open %s: %m", vtname); return E_OS_ERROR; } vt->num = vtnum; return E_SUCCESS; } void nodm_vt_stop(struct nodm_vt* vt) { if (vt->fd != -1) { close(vt->fd); vt->fd = -1; vt->num = -1; } } nodm-0.11/AUTHORS0000644000175000017500000000011211150562237010355 00000000000000Enrico Zini Joachim Breitner nodm-0.11/common.h0000644000175000017500000000664511605342762010773 00000000000000/* * common - common nodm definitions and utility functions * * Copyright 2011 Enrico Zini * * 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., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #ifndef NODM_DEFS_H #define NODM_DEFS_H #include // Exit codes used by shadow programs #define E_SUCCESS 0 ///< success #define E_NOPERM 1 ///< permission denied #define E_USAGE 2 ///< invalid command syntax #define E_BAD_ARG 3 ///< invalid argument to option #define E_PASSWD_NOTFOUND 14 ///< not found password file #define E_SHADOW_NOTFOUND 15 ///< not found shadow password file #define E_GROUP_NOTFOUND 16 ///< not found group file #define E_GSHADOW_NOTFOUND 17 ///< not found shadow group file #define E_CMD_NOEXEC 126 ///< can't run command/shell #define E_CMD_NOTFOUND 127 ///< can't find command/shell to run // Other nodm-specific exit codes #define E_PROGRAMMING 200 ///< Programming error #define E_PAM_ERROR 201 ///< something wrong talking with PAM #define E_OS_ERROR 202 ///< something wrong talking with the Operating System #define E_XLIB_ERROR 203 ///< Xlib error #define E_VT_ALLOC_ERROR 204 ///< VT allocation error #define E_X_SERVER_DIED 210 ///< Server died #define E_X_SERVER_TIMEOUT 211 ///< Server not ready before timeout #define E_X_SERVER_CONNECT 212 ///< Could not connect to X server #define E_SESSION_DIED 220 ///< X session died #define E_USER_QUIT 221 ///< Quit requested /// Return the basename of a path, as a pointer inside \a str const char* basename (const char* str); /** * Like getenv, but if the variable is not defined it returns \a def */ const char* getenv_with_default(const char* envname, const char* def); /** * Like strcpy but: * * * it works only for sized character arrays (it expects sizeof on them) * * it always null-terminates the destination string * * it returns false if the string was truncated, else true */ #define bounded_strcpy(dst, src) (snprintf(dst, sizeof(dst), "%s", (src)) < sizeof(dst)) /// Return the string description of an exit code const char* nodm_strerror(int code); /** * Check if a child has died. * * @param pid * process ID to check * @retval quit * 0 if it is still running * 1 if it has just quit and we got its exit status * 2 if the pid does not exist * @retval status * the exit status if it has quit */ int child_has_quit(pid_t pid, int* quit, int* status); /** * Kill a child process if it still running and wait for it to end * * @param pid * The child pid * @param procdesc * Child process description to use in the logs */ int child_must_exit(pid_t pid, const char* procdesc); #endif nodm-0.11/autogen.sh0000755000175000017500000000003211151210607011277 00000000000000#!/bin/sh autoreconf -if nodm-0.11/dm.c0000644000175000017500000002507511622724142010067 00000000000000/* * dm - nodm X display manager * * Copyright 2011 Enrico Zini * * 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., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include "dm.h" #include "common.h" #include "log.h" #include #include #include #include #include #include #include #include #include #include void nodm_display_manager_init(struct nodm_display_manager* dm) { nodm_xserver_init(&dm->srv); nodm_xsession_init(&dm->session); nodm_vt_init(&dm->vt); dm->conf_minimum_session_time = atoi(getenv_with_default("NODM_MIN_SESSION_TIME", "60")); dm->_srv_split_args = NULL; dm->_srv_split_argv = NULL; // Save original signal mask if (sigprocmask(SIG_BLOCK, NULL, &dm->orig_signal_mask) == -1) log_err("sigprocmask error: %m"); dm->srv.orig_signal_mask = dm->orig_signal_mask; dm->session.orig_signal_mask = dm->orig_signal_mask; } void nodm_display_manager_cleanup(struct nodm_display_manager* dm) { // Restore original signal mask if (sigprocmask(SIG_SETMASK, &dm->orig_signal_mask, NULL) == -1) log_err("sigprocmask error: %m"); nodm_vt_stop(&dm->vt); // Deallocate parsed arguments, if used if (dm->_srv_split_args) { wordexp_t* we = (wordexp_t*)dm->_srv_split_args; wordfree(we); free(we); dm->_srv_split_args = NULL; } if (dm->_srv_split_argv) { free(dm->_srv_split_argv); dm->_srv_split_argv = NULL; } } int nodm_display_manager_start(struct nodm_display_manager* dm) { int res = nodm_vt_start(&dm->vt); if (res != E_SUCCESS) return res; if (dm->vt.num != -1) { // Create the vtN argument snprintf(dm->_vtarg, sizeof(dm->_vtarg), "vt%d", dm->vt.num); // Append it to srv args const char** s = dm->srv.argv; while (*s) ++s; *s++ = dm->_vtarg; *s = NULL; log_verb("allocated VT %d", dm->vt.num); } else log_verb("skipped VT allocation"); // Block all signals sigset_t blockmask; if (sigfillset(&blockmask) == -1) { log_err("sigfillset error: %m"); return E_PROGRAMMING; } if (sigprocmask(SIG_BLOCK, &blockmask, NULL) == -1) { log_err("sigprocmask error: %m"); return E_PROGRAMMING; } res = nodm_display_manager_restart(dm); if (res != E_SUCCESS) return res; return E_SUCCESS; } int nodm_display_manager_restart(struct nodm_display_manager* dm) { dm->last_session_start = time(NULL); int res = nodm_xserver_start(&dm->srv); if (res != E_SUCCESS) return res; log_verb("X server is ready for connections"); res = nodm_xsession_start(&dm->session, &dm->srv); if (res != E_SUCCESS) return res; log_verb("X session has started"); return E_SUCCESS; } int nodm_display_manager_stop(struct nodm_display_manager* dm) { int res = nodm_xsession_stop(&dm->session); if (res != E_SUCCESS) return res; res = nodm_xserver_stop(&dm->srv); if (res != E_SUCCESS) return res; return E_SUCCESS; } // Signal handler for wait loop static int quit_signal_caught = 0; static void catch_signals (int sig) { ++quit_signal_caught; } static int setup_quit_notification(sigset_t* origset) { /* Reset caught signal flag */ quit_signal_caught = 0; struct sigaction action; action.sa_handler = catch_signals; sigemptyset (&action.sa_mask); action.sa_flags = 0; sigset_t ourset; if (sigemptyset(&ourset) || sigaddset(&ourset, SIGTERM) || sigaddset(&ourset, SIGINT) || sigaddset(&ourset, SIGQUIT) || sigaction(SIGTERM, &action, NULL) || sigaction(SIGINT, &action, NULL) || sigaction(SIGQUIT, &action, NULL) || sigprocmask(SIG_UNBLOCK, &ourset, origset) ) { log_err("signal operations error: %m"); return E_PROGRAMMING; } return E_SUCCESS; } static void shutdown_quit_notification(const sigset_t* origset) { if (sigprocmask(SIG_SETMASK, origset, NULL) == -1) log_err("sigprocmask error: %m"); } int nodm_display_manager_wait(struct nodm_display_manager* dm, int* session_status) { int res = E_SUCCESS; // Catch the normal termination signals using 'catch_signals' sigset_t origset; res = setup_quit_notification(&origset); if (res != E_SUCCESS) return res; *session_status = -1; while (true) { // Wait for one child to exit int status; pid_t child = waitpid(-1, &status, 0); if (child == -1) { if (errno == EINTR) { if (quit_signal_caught) { log_info("shutdown signal received"); res = E_USER_QUIT; goto cleanup; } else continue; } else { log_warn("waitpid error: %m"); res = E_OS_ERROR; goto cleanup; } } if (child == dm->srv.pid) { // Server died nodm_xserver_report_exit(&dm->srv, status); res = E_X_SERVER_DIED; goto cleanup; } else if (child == dm->session.pid) { // Session died nodm_xsession_report_exit(&dm->session, status); *session_status = status; res = E_SESSION_DIED; goto cleanup; } } cleanup: shutdown_quit_notification(&origset); return res; } int nodm_display_manager_parse_xcmdline(struct nodm_display_manager* s, const char* xcmdline) { int return_code = E_SUCCESS; char **argv = NULL; // tokenize xoptions wordexp_t* toks = (wordexp_t*)calloc(1, sizeof(wordexp_t)); switch (wordexp(xcmdline, toks, WRDE_NOCMD)) { case 0: break; case WRDE_NOSPACE: return_code = E_OS_ERROR; goto cleanup; default: toks->we_wordv = NULL; return_code = E_BAD_ARG; goto cleanup; } unsigned in_arg = 0; unsigned argc = 0; // +1 for the X server pathname, +1 for the display name, // +1 for the VT number, +1 for the trailing NULL argv =(char**)malloc((toks->we_wordc + 4) * sizeof(char*)); if (argv == NULL) { return_code = E_OS_ERROR; goto cleanup; } // Server command if (in_arg < toks->we_wordc && (toks->we_wordv[in_arg][0] == '/' || toks->we_wordv[in_arg][0] == '.')) argv[argc++] = toks->we_wordv[in_arg++]; else argv[argc++] = "/usr/bin/X"; // Server name if (in_arg < toks->we_wordc && toks->we_wordv[in_arg][0] == ':' && isdigit(toks->we_wordv[in_arg][1])) { argv[argc] = toks->we_wordv[in_arg++]; s->srv.name = argv[argc]; ++argc; } else { argv[argc] = ":0"; s->srv.name = argv[argc]; ++argc; } // Copy other args while (in_arg < toks->we_wordc) { int vtn; if (sscanf(toks->we_wordv[in_arg], "vt%d", &vtn) == 1) // if vtN has been provided by the caller, disable VT allocation s->vt.conf_initial_vt = -1; argv[argc++] = toks->we_wordv[in_arg++]; } argv[argc] = NULL; s->srv.argv = (const char**)argv; s->_srv_split_argv = argv; s->_srv_split_args = toks; argv = NULL; toks = NULL; cleanup: if (toks != NULL) { if (toks->we_wordv) wordfree(toks); free(toks); } if (argv != NULL) free(argv); return return_code; } void nodm_display_manager_dump_status(struct nodm_display_manager* dm) { nodm_xserver_dump_status(&dm->srv); nodm_xsession_dump_status(&dm->session); } static int interruptible_sleep(int seconds) { int res = E_SUCCESS; // Catch the normal termination signals using 'catch_signals' sigset_t origset; res = setup_quit_notification(&origset); if (res != E_SUCCESS) return res; struct timespec tosleep = { .tv_sec = seconds, .tv_nsec = 0 }; struct timespec remaining; while (true) { int r = nanosleep(&tosleep, &remaining); if (r != -1) break; else if (errno == EINTR) { if (quit_signal_caught) { res = E_USER_QUIT; break; } else tosleep = remaining; } else { log_warn("sleep aborted: %m (ignoring error"); break; } } shutdown_quit_notification(&origset); return res; } int nodm_display_manager_wait_restart_loop(struct nodm_display_manager* dm) { static int retry_times[] = { 0, 0, 30, 30, 60, 60, -1 }; int restart_count = 0; int res; while (1) { int sstatus; res = nodm_display_manager_wait(dm, &sstatus); time_t end = time(NULL); nodm_display_manager_stop(dm); switch (res) { case E_X_SERVER_DIED: break; case E_SESSION_DIED: break; default: return res; } /* Check if the session was too short */ if (end - dm->last_session_start < dm->conf_minimum_session_time) { if (retry_times[restart_count+1] != -1) ++restart_count; } else restart_count = 0; /* Sleep a bit if the session was too short */ if (retry_times[restart_count] > 0) { log_warn("session lasted less than %d seconds: sleeping %d seconds before restarting it", dm->conf_minimum_session_time, retry_times[restart_count]); res = interruptible_sleep(retry_times[restart_count]); if (res != E_SUCCESS) return res; } log_info("restarting session"); res = nodm_display_manager_restart(dm); if (res != E_SUCCESS) return res; } } nodm-0.11/test_nodm0000755000175000017500000000120111203006215011213 00000000000000#!/bin/sh case "$1" in '') # test "$2" != "a" && echo "\$3 is '$2' instead of 'a'" # test "$3" != "b" && echo "\$4 is '$3' instead of 'b'" # test "$4" != "c" && echo "\$5 is '$4' instead of 'c'" echo "PATH is: $PATH" echo "USER is: $USER" echo "HOME is: $HOME" echo "pwd: `pwd`" echo "id: `id`" pstree `pgrep nodm|head -1` # set > test_nodm.env.tmp exit 0 ;; *) export NODM_USER=$1 export NODM_XINIT="time" export NODM_XSESSION="`pwd`/$0" # export NODM_X_OPTIONS="runtest a b c" export NODM_MIN_SESSION_TIME=60 exec ./nodm --session `pwd`/nodm ;; 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