+++ /dev/null
-/*-*- Mode: C; c-basic-offset: 8 -*-*/
-
-/***
- This file is part of systemd.
-
- Copyright 2010 Lennart Poettering
-
- systemd 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.
-
- systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <dbus/dbus.h>
-
-#include <stdio.h>
-#include <errno.h>
-#include <string.h>
-#include <unistd.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <getopt.h>
-#include <signal.h>
-#include <sys/wait.h>
-#include <fcntl.h>
-
-#include "manager.h"
-#include "log.h"
-#include "mount-setup.h"
-#include "hostname-setup.h"
-#include "loopback-setup.h"
-#include "load-fragment.h"
-#include "fdset.h"
-
-static enum {
- ACTION_RUN,
- ACTION_HELP,
- ACTION_TEST,
- ACTION_DUMP_CONFIGURATION_ITEMS
-} action = ACTION_RUN;
-
-static char *default_unit = NULL;
-static ManagerRunningAs running_as = _MANAGER_RUNNING_AS_INVALID;
-
-static bool dump_core = true;
-static bool crash_shell = false;
-static int crash_chvt = -1;
-static bool confirm_spawn = false;
-static FILE* serialization = NULL;
-
-_noreturn static void freeze(void) {
- for (;;)
- pause();
-}
-
-static void nop_handler(int sig) {
-}
-
-_noreturn static void crash(int sig) {
-
- if (!dump_core)
- log_error("Caught <%s>, not dumping core.", strsignal(sig));
- else {
- struct sigaction sa;
- pid_t pid;
-
- /* We want to wait for the core process, hence let's enable SIGCHLD */
- zero(sa);
- sa.sa_handler = nop_handler;
- sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
- assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
-
- if ((pid = fork()) < 0)
- log_error("Caught <%s>, cannot fork for core dump: %s", strsignal(sig), strerror(errno));
-
- else if (pid == 0) {
- struct rlimit rl;
-
- /* Enable default signal handler for core dump */
- zero(sa);
- sa.sa_handler = SIG_DFL;
- assert_se(sigaction(sig, &sa, NULL) == 0);
-
- /* Don't limit the core dump size */
- zero(rl);
- rl.rlim_cur = RLIM_INFINITY;
- rl.rlim_max = RLIM_INFINITY;
- setrlimit(RLIMIT_CORE, &rl);
-
- /* Just to be sure... */
- assert_se(chdir("/") == 0);
-
- /* Raise the signal again */
- raise(sig);
-
- assert_not_reached("We shouldn't be here...");
- _exit(1);
-
- } else {
- int status, r;
-
- /* Order things nicely. */
- if ((r = waitpid(pid, &status, 0)) < 0)
- log_error("Caught <%s>, waitpid() failed: %s", strsignal(sig), strerror(errno));
- else if (!WCOREDUMP(status))
- log_error("Caught <%s>, core dump failed.", strsignal(sig));
- else
- log_error("Caught <%s>, dumped core as pid %llu.", strsignal(sig), (unsigned long long) pid);
- }
- }
-
- if (crash_chvt)
- chvt(crash_chvt);
-
- if (crash_shell) {
- struct sigaction sa;
- pid_t pid;
-
- log_info("Executing crash shell in 10s...");
- sleep(10);
-
- /* Let the kernel reap children for us */
- zero(sa);
- sa.sa_handler = SIG_IGN;
- sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART;
- assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
-
- if ((pid = fork()) < 0)
- log_error("Failed to fork off crash shell: %s", strerror(errno));
- else if (pid == 0) {
- int fd, r;
-
- if ((fd = acquire_terminal("/dev/console", false, true)) < 0) {
- log_error("Failed to acquire terminal: %s", strerror(-fd));
- _exit(1);
- }
-
- if ((r = make_stdio(fd)) < 0) {
- log_error("Failed to duplicate terminal fd: %s", strerror(-r));
- _exit(1);
- }
-
- execl("/bin/sh", "/bin/sh", NULL);
-
- log_error("execl() failed: %s", strerror(errno));
- _exit(1);
- }
-
- log_info("Successfully spawned crash shall as pid %llu.", (unsigned long long) pid);
- }
-
- log_info("Freezing execution.");
- freeze();
-}
-
-static void install_crash_handler(void) {
- struct sigaction sa;
-
- zero(sa);
-
- sa.sa_handler = crash;
- sa.sa_flags = SA_NODEFER;
-
- assert_se(sigaction(SIGSEGV, &sa, NULL) == 0);
- assert_se(sigaction(SIGILL, &sa, NULL) == 0);
- assert_se(sigaction(SIGFPE, &sa, NULL) == 0);
- assert_se(sigaction(SIGBUS, &sa, NULL) == 0);
- assert_se(sigaction(SIGQUIT, &sa, NULL) == 0);
- assert_se(sigaction(SIGABRT, &sa, NULL) == 0);
-}
-
-static int make_null_stdio(void) {
- int null_fd, r;
-
- if ((null_fd = open("/dev/null", O_RDWR)) < 0) {
- log_error("Failed to open /dev/null: %m");
- return -errno;
- }
-
- if ((r = make_stdio(null_fd)) < 0)
- log_warning("Failed to dup2() device: %s", strerror(-r));
-
- return r;
-}
-
-static int console_setup(bool do_reset) {
- int tty_fd, r;
-
- /* If we are init, we connect stdin/stdout/stderr to /dev/null
- * and make sure we don't have a controlling tty. */
-
- release_terminal();
-
- if (!do_reset)
- return 0;
-
- if ((tty_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) {
- log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
- return -tty_fd;
- }
-
- if ((r = reset_terminal(tty_fd)) < 0)
- log_error("Failed to reset /dev/console: %s", strerror(-r));
-
- close_nointr_nofail(tty_fd);
- return r;
-}
-
-static int set_default_unit(const char *u) {
- char *c;
-
- assert(u);
-
- if (!(c = strdup(u)))
- return -ENOMEM;
-
- free(default_unit);
- default_unit = c;
- return 0;
-}
-
-static int parse_proc_cmdline_word(const char *word) {
-
- static const char * const rlmap[] = {
- "single", SPECIAL_RUNLEVEL1_TARGET,
- "-s", SPECIAL_RUNLEVEL1_TARGET,
- "s", SPECIAL_RUNLEVEL1_TARGET,
- "S", SPECIAL_RUNLEVEL1_TARGET,
- "1", SPECIAL_RUNLEVEL1_TARGET,
- "2", SPECIAL_RUNLEVEL2_TARGET,
- "3", SPECIAL_RUNLEVEL3_TARGET,
- "4", SPECIAL_RUNLEVEL4_TARGET,
- "5", SPECIAL_RUNLEVEL5_TARGET
- };
-
- if (startswith(word, "systemd.default="))
- return set_default_unit(word + 16);
-
- else if (startswith(word, "systemd.log_target=")) {
-
- if (log_set_target_from_string(word + 19) < 0)
- log_warning("Failed to parse log target %s. Ignoring.", word + 19);
-
- } else if (startswith(word, "systemd.log_level=")) {
-
- if (log_set_max_level_from_string(word + 18) < 0)
- log_warning("Failed to parse log level %s. Ignoring.", word + 18);
-
- } else if (startswith(word, "systemd.dump_core=")) {
- int r;
-
- if ((r = parse_boolean(word + 18)) < 0)
- log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
- else
- dump_core = r;
-
- } else if (startswith(word, "systemd.crash_shell=")) {
- int r;
-
- if ((r = parse_boolean(word + 20)) < 0)
- log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
- else
- crash_shell = r;
-
-
- } else if (startswith(word, "systemd.confirm_spawn=")) {
- int r;
-
- if ((r = parse_boolean(word + 22)) < 0)
- log_warning("Failed to parse confirm spawn switch %s, Ignoring.", word + 22);
- else
- confirm_spawn = r;
-
- } else if (startswith(word, "systemd.crash_chvt=")) {
- int k;
-
- if (safe_atoi(word + 19, &k) < 0)
- log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
- else
- crash_chvt = k;
-
- } else if (startswith(word, "systemd.")) {
-
- log_warning("Unknown kernel switch %s. Ignoring.", word);
-
- log_info("Supported kernel switches:");
- log_info("systemd.default=UNIT Default unit to start");
- log_info("systemd.log_target=console|kmsg|syslog Log target");
- log_info("systemd.log_level=LEVEL Log level");
- log_info("systemd.dump_core=0|1 Dump core on crash");
- log_info("systemd.crash_shell=0|1 On crash run shell");
- log_info("systemd.crash_chvt=N Change to VT #N on crash");
- log_info("systemd.confirm_spawn=0|1 Confirm every process spawn");
-
- } else {
- unsigned i;
-
- /* SysV compatibility */
- for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
- if (streq(word, rlmap[i]))
- return set_default_unit(rlmap[i+1]);
- }
-
- return 0;
-}
-
-static int parse_proc_cmdline(void) {
- char *line;
- int r;
- char *w;
- size_t l;
- char *state;
-
- if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
- log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(errno));
- return 0;
- }
-
- FOREACH_WORD_QUOTED(w, l, line, state) {
- char *word;
-
- if (!(word = strndup(w, l))) {
- r = -ENOMEM;
- goto finish;
- }
-
- r = parse_proc_cmdline_word(word);
- free(word);
-
- if (r < 0)
- goto finish;
- }
-
- r = 0;
-
-finish:
- free(line);
- return r;
-}
-
-static int parse_argv(int argc, char *argv[]) {
-
- enum {
- ARG_LOG_LEVEL = 0x100,
- ARG_LOG_TARGET,
- ARG_DEFAULT,
- ARG_RUNNING_AS,
- ARG_TEST,
- ARG_DUMP_CONFIGURATION_ITEMS,
- ARG_CONFIRM_SPAWN,
- ARG_DESERIALIZE
- };
-
- static const struct option options[] = {
- { "log-level", required_argument, NULL, ARG_LOG_LEVEL },
- { "log-target", required_argument, NULL, ARG_LOG_TARGET },
- { "default", required_argument, NULL, ARG_DEFAULT },
- { "running-as", required_argument, NULL, ARG_RUNNING_AS },
- { "test", no_argument, NULL, ARG_TEST },
- { "help", no_argument, NULL, 'h' },
- { "dump-configuration-items", no_argument, NULL, ARG_DUMP_CONFIGURATION_ITEMS },
- { "confirm-spawn", no_argument, NULL, ARG_CONFIRM_SPAWN },
- { "deserialize", required_argument, NULL, ARG_DESERIALIZE },
- { NULL, 0, NULL, 0 }
- };
-
- int c, r;
-
- assert(argc >= 1);
- assert(argv);
-
- while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
-
- switch (c) {
-
- case ARG_LOG_LEVEL:
- if ((r = log_set_max_level_from_string(optarg)) < 0) {
- log_error("Failed to parse log level %s.", optarg);
- return r;
- }
-
- break;
-
- case ARG_LOG_TARGET:
-
- if ((r = log_set_target_from_string(optarg)) < 0) {
- log_error("Failed to parse log target %s.", optarg);
- return r;
- }
-
- break;
-
- case ARG_DEFAULT:
-
- if ((r = set_default_unit(optarg)) < 0) {
- log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
- return r;
- }
-
- break;
-
- case ARG_RUNNING_AS: {
- ManagerRunningAs as;
-
- if ((as = manager_running_as_from_string(optarg)) < 0) {
- log_error("Failed to parse running as value %s", optarg);
- return -EINVAL;
- }
-
- running_as = as;
- break;
- }
-
- case ARG_TEST:
- action = ACTION_TEST;
- break;
-
- case ARG_DUMP_CONFIGURATION_ITEMS:
- action = ACTION_DUMP_CONFIGURATION_ITEMS;
- break;
-
- case ARG_CONFIRM_SPAWN:
- confirm_spawn = true;
- break;
-
- case ARG_DESERIALIZE: {
- int fd;
- FILE *f;
-
- if ((r = safe_atoi(optarg, &fd)) < 0 || fd < 0) {
- log_error("Failed to parse deserialize option %s.", optarg);
- return r;
- }
-
- if (!(f = fdopen(fd, "r"))) {
- log_error("Failed to open serialization fd: %m");
- return r;
- }
-
- if (serialization)
- fclose(serialization);
-
- serialization = f;
-
- break;
- }
-
- case 'h':
- action = ACTION_HELP;
- break;
-
- case '?':
- return -EINVAL;
-
- default:
- log_error("Unknown option code %c", c);
- return -EINVAL;
- }
-
- /* PID 1 will get the kernel arguments as parameters, which we
- * ignore and unconditionally read from
- * /proc/cmdline. However, we need to ignore those arguments
- * here. */
- if (running_as != MANAGER_INIT && optind < argc) {
- log_error("Excess arguments.");
- return -EINVAL;
- }
-
- return 0;
-}
-
-static int help(void) {
-
- printf("%s [options]\n\n"
- " -h --help Show this help\n"
- " --default=UNIT Set default unit\n"
- " --log-level=LEVEL Set log level\n"
- " --log-target=TARGET Set log target (console, syslog, kmsg, syslog-or-kmsg)\n"
- " --running-as=AS Set running as (init, system, session)\n"
- " --test Determine startup sequence, dump it and exit\n"
- " --dump-configuration-items Dump understood unit configuration items\n"
- " --confirm-spawn Ask for confirmation when spawning processes\n",
- __progname);
-
- return 0;
-}
-
-static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds) {
- FILE *f = NULL;
- FDSet *fds = NULL;
- int r;
-
- assert(m);
- assert(_f);
- assert(_fds);
-
- if ((r = manager_open_serialization(&f)) < 0) {
- log_error("Failed to create serialization faile: %s", strerror(-r));
- goto fail;
- }
-
- if (!(fds = fdset_new())) {
- r = -ENOMEM;
- log_error("Failed to allocate fd set: %s", strerror(-r));
- goto fail;
- }
-
- if ((r = manager_serialize(m, f, fds)) < 0) {
- log_error("Failed to serialize state: %s", strerror(-r));
- goto fail;
- }
-
- if (fseeko(f, 0, SEEK_SET) < 0) {
- log_error("Failed to rewind serialization fd: %m");
- goto fail;
- }
-
- if ((r = fd_cloexec(fileno(f), false)) < 0) {
- log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r));
- goto fail;
- }
-
- if ((r = fdset_cloexec(fds, false)) < 0) {
- log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r));
- goto fail;
- }
-
- *_f = f;
- *_fds = fds;
-
- return 0;
-
-fail:
- fdset_free(fds);
-
- if (f)
- fclose(f);
-
- return r;
-}
-
-int main(int argc, char *argv[]) {
- Manager *m = NULL;
- Unit *target = NULL;
- Job *job = NULL;
- int r, retval = 1;
- FDSet *fds = NULL;
- bool reexecute = false;
-
- if (getpid() == 1) {
- running_as = MANAGER_INIT;
- log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
- } else
- running_as = MANAGER_SESSION;
-
- if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
- goto finish;
-
- /* Mount /proc, /sys and friends, so that /proc/cmdline and
- * /proc/$PID/fd is available. */
- if (mount_setup() < 0)
- goto finish;
-
- /* Reset all signal handlers. */
- assert_se(reset_all_signal_handlers() == 0);
-
- /* If we are init, we can block sigkill. Yay. */
- ignore_signal(SIGKILL);
- ignore_signal(SIGPIPE);
-
- if (running_as != MANAGER_SESSION)
- if (parse_proc_cmdline() < 0)
- goto finish;
-
- log_parse_environment();
-
- if (parse_argv(argc, argv) < 0)
- goto finish;
-
- if (action == ACTION_HELP) {
- retval = help();
- goto finish;
- } else if (action == ACTION_DUMP_CONFIGURATION_ITEMS) {
- unit_dump_config_items(stdout);
- retval = 0;
- goto finish;
- }
-
- assert_se(action == ACTION_RUN || action == ACTION_TEST);
-
- /* Remember open file descriptors for later deserialization */
- if (serialization) {
- if ((r = fdset_new_fill(&fds)) < 0) {
- log_error("Failed to allocate fd set: %s", strerror(-r));
- goto finish;
- }
-
- assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
- } else
- close_all_fds(NULL, 0);
-
- /* Set up PATH unless it is already set */
- setenv("PATH",
- "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
- running_as == MANAGER_INIT);
-
- /* Move out of the way, so that we won't block unmounts */
- assert_se(chdir("/") == 0);
-
- if (running_as != MANAGER_SESSION) {
- /* Become a session leader if we aren't one yet. */
- setsid();
-
- /* Disable the umask logic */
- umask(0);
- }
-
- /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
- dbus_connection_set_change_sigpipe(FALSE);
-
- /* Reset the console, but only if this is really init and we
- * are freshly booted */
- if (running_as != MANAGER_SESSION && action == ACTION_RUN) {
- console_setup(getpid() == 1 && !serialization);
- make_null_stdio();
- }
-
- /* Open the logging devices, if possible and necessary */
- log_open();
-
- /* Make sure we leave a core dump without panicing the
- * kernel. */
- if (getpid() == 1)
- install_crash_handler();
-
- log_debug("systemd running in %s mode.", manager_running_as_to_string(running_as));
-
- if (running_as == MANAGER_INIT) {
- hostname_setup();
- loopback_setup();
- }
-
- if ((r = manager_new(running_as, confirm_spawn, &m)) < 0) {
- log_error("Failed to allocate manager object: %s", strerror(-r));
- goto finish;
- }
-
- if ((r = manager_startup(m, serialization, fds)) < 0)
- log_error("Failed to fully start up daemon: %s", strerror(-r));
-
- if (fds) {
- /* This will close all file descriptors that were opened, but
- * not claimed by any unit. */
-
- fdset_free(fds);
- fds = NULL;
- }
-
- if (serialization) {
- fclose(serialization);
- serialization = NULL;
- } else {
- log_debug("Activating default unit: %s", default_unit);
-
- if ((r = manager_load_unit(m, default_unit, NULL, &target)) < 0) {
- log_error("Failed to load default target: %s", strerror(-r));
-
- log_info("Trying to load rescue target...");
- if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &target)) < 0) {
- log_error("Failed to load rescue target: %s", strerror(-r));
- goto finish;
- }
- }
-
- if (action == ACTION_TEST) {
- printf("-> By units:\n");
- manager_dump_units(m, stdout, "\t");
- }
-
- if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &job)) < 0) {
- log_error("Failed to start default target: %s", strerror(-r));
- goto finish;
- }
-
- if (action == ACTION_TEST) {
- printf("-> By jobs:\n");
- manager_dump_jobs(m, stdout, "\t");
- retval = 0;
- goto finish;
- }
- }
-
- for (;;) {
- if ((r = manager_loop(m)) < 0) {
- log_error("Failed to run mainloop: %s", strerror(-r));
- goto finish;
- }
-
- switch (m->exit_code) {
-
- case MANAGER_EXIT:
- retval = 0;
- log_debug("Exit.");
- goto finish;
-
- case MANAGER_RELOAD:
- if ((r = manager_reload(m)) < 0)
- log_error("Failed to reload: %s", strerror(-r));
- break;
-
- case MANAGER_REEXECUTE:
- if (prepare_reexecute(m, &serialization, &fds) < 0)
- goto finish;
-
- reexecute = true;
- log_debug("Reexecuting.");
- goto finish;
-
- default:
- assert_not_reached("Unknown exit code.");
- }
- }
-
-finish:
- if (m)
- manager_free(m);
-
- free(default_unit);
-
- dbus_shutdown();
-
- if (reexecute) {
- const char *args[11];
- unsigned i = 0;
- char sfd[16];
-
- assert(serialization);
- assert(fds);
-
- args[i++] = SYSTEMD_BINARY_PATH;
-
- args[i++] = "--log-level";
- args[i++] = log_level_to_string(log_get_max_level());
-
- args[i++] = "--log-target";
- args[i++] = log_target_to_string(log_get_target());
-
- args[i++] = "--running-as";
- args[i++] = manager_running_as_to_string(running_as);
-
- snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
- char_array_0(sfd);
-
- args[i++] = "--deserialize";
- args[i++] = sfd;
-
- if (confirm_spawn)
- args[i++] = "--confirm-spawn";
-
- args[i++] = NULL;
-
- assert(i <= ELEMENTSOF(args));
-
- execv(args[0], (char* const*) args);
-
- log_error("Failed to reexecute: %m");
- }
-
- if (serialization)
- fclose(serialization);
-
- if (fds)
- fdset_free(fds);
-
- if (getpid() == 1)
- freeze();
-
- return retval;
-}
~ianmdlvl / elogind.git / blobdiff