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Diffstat (limited to 'src/main-utils.c')
| -rw-r--r-- | src/main-utils.c | 279 |
1 files changed, 279 insertions, 0 deletions
diff --git a/src/main-utils.c b/src/main-utils.c new file mode 100644 index 00000000..0fa3644f --- /dev/null +++ b/src/main-utils.c @@ -0,0 +1,279 @@ +/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */ +/* NetworkManager -- Network link manager + * + * 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. + * + * Copyright (C) 2004 - 2012 Red Hat, Inc. + * Copyright (C) 2005 - 2008 Novell, Inc. + */ + +#include "config.h" + +#include <stdio.h> +#include <errno.h> +#include <fcntl.h> +#include <stdlib.h> +#include <unistd.h> +#include <sys/stat.h> +#include <locale.h> + +#include <glib.h> +#include <glib/gi18n.h> +#include <gmodule.h> + +#include "main-utils.h" +#include "nm-posix-signals.h" +#include "nm-logging.h" + +static sigset_t signal_set; +static gboolean *quit_early = NULL; + +/* + * Thread function waiting for signals and processing them. + * Wait for signals in signal set. The semantics of sigwait() require that all + * threads (including the thread calling sigwait()) have the signal masked, for + * reliable operation. Otherwise, a signal that arrives while this thread is + * not blocked in sigwait() might be delivered to another thread. + */ +static void * +signal_handling_thread (void *arg) +{ + GMainLoop *main_loop = arg; + int signo; + + while (1) { + sigwait (&signal_set, &signo); + + switch (signo) { + case SIGINT: + case SIGTERM: + nm_log_info (LOGD_CORE, "caught signal %d, shutting down normally.", signo); + *quit_early = TRUE; /* for quitting before entering the main loop */ + g_main_loop_quit (main_loop); + break; + case SIGHUP: + /* Reread config stuff like system config files, VPN service files, etc */ + nm_log_info (LOGD_CORE, "caught signal %d, not supported yet.", signo); + break; + case SIGPIPE: + /* silently ignore signal */ + break; + default: + nm_log_err (LOGD_CORE, "caught unexpected signal %d", signo); + break; + } + } + return NULL; +} + +/** + * nm_main_utils_setup_signals: + * @main_loop: the #GMainLoop to quit when SIGINT or SIGTERM is received + * @quit_early: location of a variable that will be set to TRUE when + * SIGINT or SIGTERM is received + * + * Mask the signals we are interested in and create a signal handling thread. + * Because all threads inherit the signal mask from their creator, all threads + * in the process will have the signals masked. That's why setup_signals() has + * to be called before creating other threads. + * + * Returns: %TRUE on success + */ +gboolean +nm_main_utils_setup_signals (GMainLoop *main_loop, gboolean *quit_early_ptr) +{ + pthread_t signal_thread_id; + sigset_t old_sig_mask; + int status; + + g_return_val_if_fail (main_loop != NULL, FALSE); + g_return_val_if_fail (quit_early_ptr != NULL, FALSE); + + quit_early = quit_early_ptr; + + sigemptyset (&signal_set); + sigaddset (&signal_set, SIGHUP); + sigaddset (&signal_set, SIGINT); + sigaddset (&signal_set, SIGTERM); + sigaddset (&signal_set, SIGPIPE); + + /* Block all signals of interest. */ + status = pthread_sigmask (SIG_BLOCK, &signal_set, &old_sig_mask); + if (status != 0) { + fprintf (stderr, _("Failed to set signal mask: %d"), status); + return FALSE; + } + /* Save original mask so that we could use it for child processes. */ + nm_save_original_signal_mask (old_sig_mask); + + /* Create the signal handling thread. */ + status = pthread_create (&signal_thread_id, NULL, signal_handling_thread, main_loop); + if (status != 0) { + fprintf (stderr, _("Failed to create signal handling thread: %d"), status); + return FALSE; + } + + return TRUE; +} + +gboolean +nm_main_utils_write_pidfile (const char *pidfile) +{ + char pid[16]; + int fd; + gboolean success = FALSE; + + if ((fd = open (pidfile, O_CREAT|O_WRONLY|O_TRUNC, 00644)) < 0) { + fprintf (stderr, _("Opening %s failed: %s\n"), pidfile, strerror (errno)); + return FALSE; + } + + g_snprintf (pid, sizeof (pid), "%d", getpid ()); + if (write (fd, pid, strlen (pid)) < 0) + fprintf (stderr, _("Writing to %s failed: %s\n"), pidfile, strerror (errno)); + else + success = TRUE; + + if (close (fd)) + fprintf (stderr, _("Closing %s failed: %s\n"), pidfile, strerror (errno)); + + return success; +} + +/** + * nm_main_utils_check_pidfile: + * @pidfile: the pid file + * @name: the process name + * + * Checks whether the pidfile already exists and contains PID of a running + * process. + * + * Returns: %TRUE if the specified pidfile already exists and contains the PID + * of a running process named @name, or %FALSE if not + */ +gboolean +nm_main_utils_check_pidfile (const char *pidfile, const char *name) +{ + char *contents = NULL; + gsize len = 0; + glong pid; + char *proc_cmdline = NULL; + gboolean nm_running = FALSE; + const char *process_name; + + /* Setup runtime directory */ + if (g_mkdir_with_parents (NMRUNDIR, 0755) != 0) { + nm_log_err (LOGD_CORE, "Cannot create '%s': %s", NMRUNDIR, strerror (errno)); + exit (1); + } + + if (!g_file_get_contents (pidfile, &contents, &len, NULL)) + return FALSE; + + if (len <= 0) + goto done; + + errno = 0; + pid = strtol (contents, NULL, 10); + if (pid <= 0 || pid > 65536 || errno) + goto done; + + g_free (contents); + proc_cmdline = g_strdup_printf ("/proc/%ld/cmdline", pid); + if (!g_file_get_contents (proc_cmdline, &contents, &len, NULL)) + goto done; + + process_name = strrchr (contents, '/'); + if (process_name) + process_name++; + else + process_name = contents; + if (strcmp (process_name, name) == 0) { + /* Check that the process exists */ + if (kill (pid, 0) == 0) { + fprintf (stderr, _("%s is already running (pid %ld)\n"), name, pid); + nm_running = TRUE; + } + } + +done: + g_free (proc_cmdline); + g_free (contents); + return nm_running; +} + +gboolean +nm_main_utils_early_setup (const char *progname, + char **argv[], + int *argc, + GOptionEntry *options, + GOptionEntry *more_options, + const char *summary) +{ + GOptionContext *opt_ctx = NULL; + GError *error = NULL; + gboolean success = FALSE; + int i; + + /* Make GIO ignore the remote VFS service; otherwise it tries to use the + * session bus to contact the remote service, and NM shouldn't ever be + * talking on the session bus. See rh #588745 + */ + setenv ("GIO_USE_VFS", "local", 1); + + /* + * Set the umask to 0022, which results in 0666 & ~0022 = 0644. + * Otherwise, if root (or an su'ing user) has a wacky umask, we could + * write out an unreadable resolv.conf. + */ + umask (022); + + /* Ensure gettext() gets the right environment (bgo #666516) */ + setlocale (LC_ALL, ""); + textdomain (GETTEXT_PACKAGE); + + if (getuid () != 0) { + fprintf (stderr, _("You must be root to run %s!\n"), progname); + exit (1); + } + + for (i = 0; options[i].long_name; i++) { + if (!strcmp (options[i].long_name, "log-level")) + options[i].description = g_strdup_printf (options[i].description, nm_logging_all_levels_to_string ()); + else if (!strcmp (options[i].long_name, "log-domains")) + options[i].description = g_strdup_printf (options[i].description, nm_logging_all_domains_to_string ()); + } + + /* Parse options */ + opt_ctx = g_option_context_new (NULL); + g_option_context_set_translation_domain (opt_ctx, GETTEXT_PACKAGE); + g_option_context_set_ignore_unknown_options (opt_ctx, FALSE); + g_option_context_set_help_enabled (opt_ctx, TRUE); + g_option_context_add_main_entries (opt_ctx, options, NULL); + if (more_options) + g_option_context_add_main_entries (opt_ctx, more_options, NULL); + g_option_context_set_summary (opt_ctx, summary); + + success = g_option_context_parse (opt_ctx, argc, argv, &error); + if (!success) { + fprintf (stderr, _("%s. Please use --help to see a list of valid options.\n"), + error->message); + g_clear_error (&error); + } + g_option_context_free (opt_ctx); + + return success; +} + |