#include <iostream>
+#include <fstream>
#include <list>
#include <cstring>
#include <csignal>
#include <unistd.h>
#include <fcntl.h>
#include <pwd.h>
+#include <termios.h>
+#ifdef __linux__
+#include <sys/prctl.h>
+#include <sys/klog.h>
+#include <sys/reboot.h>
+#endif
+#if defined(__FreeBSD__) || defined(__DragonFly__)
+#include <sys/procctl.h>
+#endif
+#include "dinit.h"
#include "dasynq.h"
#include "service.h"
#include "control.h"
#include "dinit-log.h"
+#include "dinit-socket.h"
+#include "static-string.h"
+#include "dinit-utmp.h"
-#ifdef __linux__
-#include <sys/klog.h>
-#include <sys/reboot.h>
-#endif
+#include "mconfig.h"
/*
- * "simpleinit" from util-linux-ng package handles signals as follows:
- * SIGTSTP - spawn no more gettys (in preparation for shutdown etc).
- * In dinit terms this should probably mean "no more auto restarts"
- * (for any service). (Actually the signal acts as a toggle, if
- * respawn is disabled it will be re-enabled and init will
- * act as if SIGHUP had also been sent)
- * SIGTERM - kill spawned gettys (which are still alive)
- * Interestingly, simpleinit just sends a SIGTERM to the gettys,
- * which will not normall kill shells (eg bash ignores SIGTERM).
- * "/sbin/initctl -r" - rollback services (ran by "shutdown"/halt etc);
- * shouldn't return until all services have been stopped.
- * shutdown calls this after sending SIGTERM to processes running
- * with uid >= 100 ("mortals").
- * SIGQUIT - init will exec() shutdown. shutdown will detect that it is
- * running as pid 1 and will just loop and reap child processes.
- * This is used by shutdown so that init will not hang on to its
- * inode, allowing the filesystem to be re-mounted readonly
- * (this is only an issue if the init binary has been unlinked,
- * since it's then holding an inode which can't be maintained
- * when the filesystem is unmounted).
+ * When running as the system init process, Dinit processes the following signals:
*
- * Not sent by shutdown:
- * SIGHUP - re-read inittab and spawn any new getty entries
- * SIGINT - (ctrl+alt+del handler) - fork & exec "reboot"
- *
- * On the contrary dinit currently uses:
* SIGTERM - roll back services and then fork/exec /sbin/halt
* SIGINT - roll back services and then fork/exec /sbin/reboot
- * SIGQUIT - exec() /sbin/shutdown as per above.
+ * SIGQUIT - exec() /sbin/shutdown without rolling back services
*
- * It's an open question about whether dinit should roll back services *before*
+ * It's an open question about whether Dinit should roll back services *before*
* running halt/reboot, since those commands should prompt rollback of services
- * anyway. But it seems safe to do so.
+ * anyway. But it seems safe to do so, and it means the user can at least stop
+ * services even if the halt/reboot commands are unavailable for some reason.
*/
+using namespace cts;
-using namespace dasynq;
-using EventLoop_t = EventLoop<NullMutex>;
-
-EventLoop_t eventLoop = EventLoop_t();
-
-static void sigint_reboot_cb(EventLoop_t *eloop) noexcept;
-static void sigquit_cb(EventLoop_t *eloop) noexcept;
-static void sigterm_cb(EventLoop_t *eloop) noexcept;
-static void open_control_socket(EventLoop_t *loop) noexcept;
-static void close_control_socket(EventLoop_t *loop) noexcept;
+using eventloop_t = dasynq::event_loop<dasynq::null_mutex>;
-static void control_socket_cb(EventLoop_t *loop, int fd);
+eventloop_t event_loop;
-class ControlSocketWatcher : public FdWatcher<NullMutex>
-{
- Rearm gotEvent(EventLoop_t * loop, int fd, int flags)
- {
- control_socket_cb(loop, fd);
- return Rearm::REARM;
- }
-
- public:
- // TODO the fd is already stored, must we really store it again...
- int fd;
-
- void registerWith(EventLoop_t * loop, int fd, int flags)
- {
- this->fd = fd;
- FdWatcher<NullMutex>::registerWith(loop, fd, flags);
- }
-};
+static void sigint_reboot_cb(eventloop_t &eloop) noexcept;
+static void sigquit_cb(eventloop_t &eloop) noexcept;
+static void sigterm_cb(eventloop_t &eloop) noexcept;
+static void open_control_socket(bool report_ro_failure = true) noexcept;
+static void close_control_socket() noexcept;
+static void confirm_restart_boot() noexcept;
+static void read_env_file(const char *);
-ControlSocketWatcher control_socket_io;
+static void control_socket_cb(eventloop_t *loop, int fd);
// Variables
-static ServiceSet *service_set;
+static dirload_service_set *services;
+static bool am_pid_one = false; // true if we are PID 1
static bool am_system_init = false; // true if we are the system init process
+static bool did_log_boot = false;
static bool control_socket_open = false;
static bool external_log_open = false;
int active_control_conns = 0;
// Control socket path. We maintain a string (control_socket_str) in case we need
// to allocate storage, but control_socket_path is the authoritative value.
-static const char *control_socket_path = "/dev/dinitctl";
+static const char *control_socket_path = SYSCONTROLSOCKET;
static std::string control_socket_str;
-static const char *log_socket_path = "/dev/log";
+static const char *env_file_path = "/etc/dinit/environment";
+
+static const char *log_path = "/dev/log";
+static bool log_is_syslog = true; // if false, log is a file
static const char *user_home_path = nullptr;
+// Set to true (when console_input_watcher is active) if console input becomes available
+static bool console_input_ready = false;
// Get user home (and set user_home_path). (The return may become invalid after
// changing the evironment (HOME variable) or using the getpwuid() function).
-const char * get_user_home()
+static const char * get_user_home()
{
if (user_home_path == nullptr) {
user_home_path = getenv("HOME");
namespace {
- class CallbackSignalHandler : public SignalWatcher<NullMutex>
+ // Event-loop handler for a signal, which just delegates to a function (pointer).
+ class callback_signal_handler : public eventloop_t::signal_watcher_impl<callback_signal_handler>
{
+ using rearm = dasynq::rearm;
+
public:
- typedef void (*cb_func_t)(EventLoop_t *);
+ typedef void (*cb_func_t)(eventloop_t &);
private:
cb_func_t cb_func;
public:
- CallbackSignalHandler() : cb_func(nullptr) { }
- CallbackSignalHandler(cb_func_t pcb_func) : cb_func(pcb_func) { }
+ callback_signal_handler() : cb_func(nullptr) { }
+ callback_signal_handler(cb_func_t pcb_func) : cb_func(pcb_func) { }
- void setCbFunc(cb_func_t cb_func)
+ void set_cb_func(cb_func_t cb_func)
{
this->cb_func = cb_func;
}
- Rearm gotSignal(EventLoop_t * eloop, int signo, SigInfo_p siginfo) override
+ rearm received(eventloop_t &eloop, int signo, siginfo_p siginfo)
{
- service_set->stop_all_services(ShutdownType::REBOOT);
- return Rearm::REARM;
+ cb_func(eloop);
+ return rearm::REARM;
}
};
- class ControlSocketWatcher : public FdWatcher<NullMutex>
+ // Event-loop handler for when a connection is made to the control socket.
+ class control_socket_watcher : public eventloop_t::fd_watcher_impl<control_socket_watcher>
{
- Rearm gotEvent(EventLoop_t * loop, int fd, int flags)
+ using rearm = dasynq::rearm;
+
+ public:
+ rearm fd_event(eventloop_t &loop, int fd, int flags) noexcept
{
- control_socket_cb(loop, fd);
- return Rearm::REARM;
+ control_socket_cb(&loop, fd);
+ return rearm::REARM;
}
};
+
+ class console_input_watcher : public eventloop_t::fd_watcher_impl<console_input_watcher>
+ {
+ using rearm = dasynq::rearm;
+
+ public:
+ rearm fd_event(eventloop_t &loop, int fd, int flags) noexcept
+ {
+ console_input_ready = true;
+ return rearm::REARM;
+ }
+ };
+
+ // Simple timer used to limit the amount of time waiting for the log flush to complete (at shutdown)
+ class log_flush_timer_t : public eventloop_t::timer_impl<log_flush_timer_t>
+ {
+ using rearm = dasynq::rearm;
+
+ bool expired = false;
+
+ public:
+ rearm timer_expiry(eventloop_t &, int expiry_count)
+ {
+ expired = true;
+ return rearm::DISARM;
+ }
+
+ bool has_expired()
+ {
+ return expired;
+ }
+ };
+
+ control_socket_watcher control_socket_io;
+ console_input_watcher console_input_io;
+ log_flush_timer_t log_flush_timer;
}
-int main(int argc, char **argv)
+int dinit_main(int argc, char **argv)
{
using namespace std;
- am_system_init = (getpid() == 1);
+ am_pid_one = (getpid() == 1);
+ am_system_init = (getuid() == 0);
const char * service_dir = nullptr;
- string service_dir_str; // to hold storage for above if necessary
+ bool service_dir_dynamic = false; // service_dir dynamically allocated?
+ const char * env_file = nullptr;
bool control_socket_path_set = false;
+ bool env_file_set = false;
// list of services to start
list<const char *> services_to_start;
// Arguments, if given, specify a list of services to start.
- // If we are running as init (PID=1), the kernel gives us any command line
- // arguments it was given but didn't recognize, including "single" (usually
- // for "boot to single user mode" aka just start the shell). We can treat
- // them as service names. In the worst case we can't find any of the named
+ // If we are running as init (PID=1), the Linux kernel gives us any command line arguments it was given
+ // but didn't recognize, including "single" (usually for "boot to single user mode" aka just start the
+ // shell). We can treat them as service names. In the worst case we can't find any of the named
// services, and so we'll start the "boot" service by default.
if (argc > 1) {
- for (int i = 1; i < argc; i++) {
- if (argv[i][0] == '-') {
- // An option...
- if (strcmp(argv[i], "--services-dir") == 0 ||
- strcmp(argv[i], "-d") == 0) {
- if (++i < argc) {
- service_dir = argv[i];
+ for (int i = 1; i < argc; i++) {
+ if (argv[i][0] == '-') {
+ // An option...
+ if (strcmp(argv[i], "--env-file") == 0 || strcmp(argv[i], "-e") == 0) {
+ if (++i < argc) {
+ env_file_set = true;
+ env_file = argv[i];
+ }
+ else {
+ cerr << "dinit: '--env-file' (-e) requires an argument" << endl;
+ }
}
- else {
- cerr << "dinit: '--services-dir' (-d) requires an argument" << endl;
- return 1;
+ else if (strcmp(argv[i], "--services-dir") == 0 || strcmp(argv[i], "-d") == 0) {
+ if (++i < argc) {
+ service_dir = argv[i];
+ }
+ else {
+ cerr << "dinit: '--services-dir' (-d) requires an argument" << endl;
+ return 1;
+ }
}
- }
- else if (strcmp(argv[i], "--system") == 0 ||
- strcmp(argv[i], "-s") == 0) {
- am_system_init = true;
- }
- else if (strcmp(argv[i], "--socket-path") == 0 ||
- strcmp(argv[i], "-p") == 0) {
- if (++i < argc) {
- control_socket_path = argv[i];
- control_socket_path_set = true;
+ else if (strcmp(argv[i], "--system") == 0 || strcmp(argv[i], "-s") == 0) {
+ am_system_init = true;
+ }
+ else if (strcmp(argv[i], "--user") == 0 || strcmp(argv[i], "-u") == 0) {
+ am_system_init = false;
+ }
+ else if (strcmp(argv[i], "--socket-path") == 0 || strcmp(argv[i], "-p") == 0) {
+ if (++i < argc) {
+ control_socket_path = argv[i];
+ control_socket_path_set = true;
+ }
+ else {
+ cerr << "dinit: '--socket-path' (-p) requires an argument" << endl;
+ return 1;
+ }
+ }
+ else if (strcmp(argv[i], "--log-file") == 0 || strcmp(argv[i], "-l") == 0) {
+ if (++i < argc) {
+ log_path = argv[i];
+ log_is_syslog = false;
+ }
+ else {
+ cerr << "dinit: '--log-file' (-l) requires an argument" << endl;
+ return 1;
+ }
+ }
+ else if (strcmp(argv[i], "--help") == 0) {
+ cout << "dinit, an init with dependency management\n"
+ " --help display help\n"
+ " --env-file <file>, -e <file>\n"
+ " environment variable initialisation file\n"
+ " --services-dir <dir>, -d <dir>\n"
+ " set base directory for service description\n"
+ " files (-d <dir>)\n"
+ " --system, -s run as the system service manager\n"
+ " --user, -u run as a user service manager\n"
+ " --socket-path <path>, -p <path>\n"
+ " path to control socket\n"
+ " <service-name> start service with name <service-name>\n";
+ return 0;
}
else {
- cerr << "dinit: '--socket-path' (-p) requires an argument" << endl;
- return 1;
+ // unrecognized
+ if (! am_system_init) {
+ cerr << "dinit: Unrecognized option: " << argv[i] << endl;
+ return 1;
+ }
}
}
- else if (strcmp(argv[i], "--help") == 0) {
- cout << "dinit, an init with dependency management" << endl;
- cout << " --help display help" << endl;
- cout << " --services-dir <dir>, -d <dir>" << endl;
- cout << " set base directory for service description" << endl;
- cout << " files (-d <dir>)" << endl;
- cout << " --system, -s run as the system init process" << endl;
- cout << " --socket-path <path>, -p <path>" << endl;
- cout << " path to control socket" << endl;
- cout << " <service-name> start service with name <service-name>" << endl;
- return 0;
- }
else {
- // unrecognized
- if (! am_system_init) {
- cerr << "dinit: Unrecognized option: " << argv[i] << endl;
- return 1;
+#ifdef __linux__
+ // LILO puts "auto" on the kernel command line for unattended boots; we'll filter it.
+ if (! am_pid_one || strcmp(argv[i], "auto") != 0) {
+ services_to_start.push_back(argv[i]);
}
- }
- }
- else {
- // LILO puts "auto" on the kernel command line for unattended boots; we'll filter it.
- if (! am_system_init || strcmp(argv[i], "auto") != 0) {
+#else
services_to_start.push_back(argv[i]);
+#endif
}
}
- }
}
if (am_system_init) {
if (onefd > 2) close(onefd);
if (twofd > 2) close(twofd);
+
+ if (! env_file_set) {
+ env_file = env_file_path;
+ }
}
-
+
/* Set up signal handlers etc */
/* SIG_CHILD is ignored by default: good */
sigset_t sigwait_set;
sigaddset(&sigwait_set, SIGCHLD);
sigaddset(&sigwait_set, SIGINT);
sigaddset(&sigwait_set, SIGTERM);
+ if (am_pid_one) sigaddset(&sigwait_set, SIGQUIT);
sigprocmask(SIG_BLOCK, &sigwait_set, NULL);
-
+
// Terminal access control signals - we block these so that dinit can't be
// suspended if it writes to the terminal after some other process has claimed
// ownership of it.
signal(SIGTTIN, SIG_IGN);
signal(SIGTTOU, SIG_IGN);
+ signal(SIGPIPE, SIG_IGN);
+
if (! am_system_init && ! control_socket_path_set) {
const char * userhome = get_user_home();
if (userhome != nullptr) {
if (service_dir == nullptr && ! am_system_init) {
const char * userhome = get_user_home();
if (userhome != nullptr) {
- service_dir_str = get_user_home();
- service_dir_str += "/dinit.d";
- service_dir = service_dir_str.c_str();
+ const char * user_home = get_user_home();
+ size_t user_home_len = strlen(user_home);
+ size_t dinit_d_len = strlen("/dinit.d");
+ size_t full_len = user_home_len + dinit_d_len + 1;
+ char *service_dir_w = new char[full_len];
+ std::memcpy(service_dir_w, user_home, user_home_len);
+ std::memcpy(service_dir_w + user_home_len, "/dinit.d", dinit_d_len);
+ service_dir_w[full_len - 1] = 0;
+
+ service_dir = service_dir_w;
+ service_dir_dynamic = true;
}
}
- if (service_dir == nullptr) {
- service_dir = "/etc/dinit.d";
- }
-
if (services_to_start.empty()) {
services_to_start.push_back("boot");
}
// Set up signal handlers
- CallbackSignalHandler sigint_watcher;
- if (am_system_init) {
- sigint_watcher.setCbFunc(sigint_reboot_cb);
+ callback_signal_handler sigterm_watcher {sigterm_cb};
+ callback_signal_handler sigint_watcher;
+ callback_signal_handler sigquit_watcher;
+
+ if (am_pid_one) {
+ sigint_watcher.set_cb_func(sigint_reboot_cb);
+ sigquit_watcher.set_cb_func(sigquit_cb);
}
else {
- sigint_watcher.setCbFunc(sigterm_cb);
+ sigint_watcher.set_cb_func(sigterm_cb);
}
+
+ sigint_watcher.add_watch(event_loop, SIGINT);
+ sigterm_watcher.add_watch(event_loop, SIGTERM);
+ console_input_io.add_watch(event_loop, STDIN_FILENO, dasynq::IN_EVENTS, false);
- CallbackSignalHandler sigquit_watcher;
- if (am_system_init) {
+ if (am_pid_one) {
// PID 1: SIGQUIT exec's shutdown
- sigquit_watcher.setCbFunc(sigquit_cb);
+ sigquit_watcher.add_watch(event_loop, SIGQUIT);
+ // As a user process, we instead just let SIGQUIT perform the default action.
}
- else {
- // Otherwise: SIGQUIT terminates dinit
- sigquit_watcher.setCbFunc(sigterm_cb);
- }
-
- auto sigterm_watcher = CallbackSignalHandler(sigterm_cb);
-
- sigint_watcher.registerWatch(&eventLoop, SIGINT);
- sigquit_watcher.registerWatch(&eventLoop, SIGQUIT);
- sigterm_watcher.registerWatch(&eventLoop, SIGTERM);
// Try to open control socket (may fail due to readonly filesystem)
- open_control_socket(&eventLoop);
+ open_control_socket(false);
#ifdef __linux__
if (am_system_init) {
// Make ctrl+alt+del combination send SIGINT to PID 1 (this process)
reboot(RB_DISABLE_CAD);
}
+
+ // Mark ourselves as a subreaper. This means that if a process we start double-forks, the
+ // orphaned child will re-parent to us rather than to PID 1 (although that could be us too).
+ prctl(PR_SET_CHILD_SUBREAPER, 1);
+#elif defined(__FreeBSD__) || defined(__DragonFly__)
+ // Documentation (man page) for this kind of sucks. PROC_REAP_ACQUIRE "acquires the reaper status for
+ // the current process" but does that mean the first two arguments still need valid values to be
+ // supplied? We'll play it safe and explicitly target our own process:
+ procctl(P_PID, getpid(), PROC_REAP_ACQUIRE, NULL);
#endif
+ log_flush_timer.add_timer(event_loop, dasynq::clock_type::MONOTONIC);
+
+ bool add_all_service_dirs = false;
+ if (service_dir == nullptr) {
+ service_dir = "/etc/dinit.d";
+ add_all_service_dirs = true;
+ }
+
/* start requested services */
- service_set = new ServiceSet(service_dir);
+ services = new dirload_service_set(service_dir, service_dir_dynamic);
+ if (add_all_service_dirs) {
+ services->add_service_dir("/usr/local/lib/dinit.d", false);
+ services->add_service_dir("/lib/dinit.d", false);
+ }
- init_log(service_set);
+ init_log(services, log_is_syslog);
+ if (am_system_init) {
+ log(loglevel_t::INFO, false, "starting system");
+ }
- for (list<const char *>::iterator i = services_to_start.begin();
- i != services_to_start.end();
- ++i) {
+ // Only try to set up the external log now if we aren't the system init. (If we are the
+ // system init, wait until the log service starts).
+ if (! am_system_init) setup_external_log();
+
+ if (env_file != nullptr) {
+ read_env_file(env_file);
+ }
+
+ for (auto svc : services_to_start) {
try {
- service_set->startService(*i);
+ services->start_service(svc);
+ // Note in general if we fail to start a service we don't need any special error handling,
+ // since we either leave other services running or, if it was the only service, then no
+ // services will be running and we will process normally (reboot if system process,
+ // exit if user process).
}
- catch (ServiceNotFound &snf) {
- log(LogLevel::ERROR, snf.serviceName, ": Could not find service description.");
+ catch (service_not_found &snf) {
+ log(loglevel_t::ERROR, snf.service_name, ": Could not find service description.");
}
- catch (ServiceLoadExc &sle) {
- log(LogLevel::ERROR, sle.serviceName, ": ", sle.excDescription);
+ catch (service_load_exc &sle) {
+ log(loglevel_t::ERROR, sle.service_name, ": ", sle.exc_description);
}
catch (std::bad_alloc &badalloce) {
- log(LogLevel::ERROR, "Out of memory when trying to start service: ", *i, ".");
+ log(loglevel_t::ERROR, "Out of memory when trying to start service: ", svc, ".");
+ break;
}
}
- event_loop:
+ run_event_loop:
// Process events until all services have terminated.
- while (service_set->count_active_services() != 0) {
- eventLoop.run();
+ while (services->count_active_services() != 0) {
+ event_loop.run();
}
- ShutdownType shutdown_type = service_set->getShutdownType();
+ shutdown_type_t shutdown_type = services->get_shutdown_type();
+ if (shutdown_type == shutdown_type_t::REMAIN) {
+ goto run_event_loop;
+ }
- if (am_system_init) {
- logMsgBegin(LogLevel::INFO, "No more active services.");
+ if (am_pid_one) {
+ log_msg_begin(loglevel_t::INFO, "No more active services.");
- if (shutdown_type == ShutdownType::REBOOT) {
- logMsgEnd(" Will reboot.");
- }
- else if (shutdown_type == ShutdownType::HALT) {
- logMsgEnd(" Will halt.");
+ if (shutdown_type == shutdown_type_t::REBOOT) {
+ log_msg_end(" Will reboot.");
}
- else if (shutdown_type == ShutdownType::POWEROFF) {
- logMsgEnd(" Will power down.");
+ else if (shutdown_type == shutdown_type_t::HALT) {
+ log_msg_end(" Will halt.");
}
- else {
- logMsgEnd(" Re-initiating boot sequence.");
+ else if (shutdown_type == shutdown_type_t::POWEROFF) {
+ log_msg_end(" Will power down.");
}
}
- while (! is_log_flushed()) {
- eventLoop.run();
+ log_flush_timer.arm_timer_rel(event_loop, timespec{5,0}); // 5 seconds
+ while (! is_log_flushed() && ! log_flush_timer.has_expired()) {
+ event_loop.run();
}
- close_control_socket(&eventLoop);
+ close_control_socket();
- if (am_system_init) {
- if (shutdown_type == ShutdownType::CONTINUE) {
- // It could be that we started in single user mode, and the
- // user has now exited the shell. We'll try and re-start the
- // boot process...
- try {
- service_set->startService("boot");
- goto event_loop; // yes, the "evil" goto
- }
- catch (...) {
- // Now WTF do we do? try to reboot
- log(LogLevel::ERROR, "Could not start 'boot' service; rebooting.");
- shutdown_type = ShutdownType::REBOOT;
+ if (am_pid_one) {
+ if (shutdown_type == shutdown_type_t::NONE) {
+ // Services all stopped but there was no shutdown issued. Inform user, wait for ack, and
+ // re-start boot sequence.
+ std::cout << "No shutdown was requested; boot failure? Will re-run boot sequence." << std::endl;
+ sync(); // Sync to minimise data loss if user elects to power off / hard reset
+ confirm_restart_boot();
+ shutdown_type = services->get_shutdown_type();
+ if (shutdown_type == shutdown_type_t::NONE) {
+ try {
+ services->start_service("boot");
+ goto run_event_loop; // yes, the "evil" goto
+ }
+ catch (...) {
+ // Now what do we do? try to reboot, but wait for user ack to avoid boot loop.
+ log(loglevel_t::ERROR, "Could not start 'boot' service. Will attempt reboot.");
+ shutdown_type = shutdown_type_t::REBOOT;
+ }
}
}
const char * cmd_arg;
- if (shutdown_type == ShutdownType::HALT) {
+ if (shutdown_type == shutdown_type_t::HALT) {
cmd_arg = "-h";
}
- else if (shutdown_type == ShutdownType::REBOOT) {
+ else if (shutdown_type == shutdown_type_t::REBOOT) {
cmd_arg = "-r";
}
else {
}
// Fork and execute dinit-reboot.
- execl("/sbin/shutdown", "/sbin/shutdown", "--system", cmd_arg, nullptr);
- log(LogLevel::ERROR, "Could not execute /sbin/shutdown: ", strerror(errno));
+ constexpr auto shutdown_exec = literal(SBINDIR) + "/shutdown";
+ execl(shutdown_exec.c_str(), shutdown_exec.c_str(), "--system", cmd_arg, nullptr);
+ log(loglevel_t::ERROR, (literal("Could not execute ") + SBINDIR + "/shutdown: ").c_str(),
+ strerror(errno));
// PID 1 must not actually exit, although we should never reach this point:
while (true) {
- eventLoop.run();
+ event_loop.run();
}
}
+ else if (shutdown_type == shutdown_type_t::REBOOT) {
+ // Non-system-process. If we got SIGINT, let's die due to it:
+ sigset_t sigwait_set_int;
+ sigemptyset(&sigwait_set_int);
+ sigaddset(&sigwait_set_int, SIGINT);
+ raise(SIGINT);
+ sigprocmask(SIG_UNBLOCK, &sigwait_set_int, NULL);
+ }
return 0;
}
+// Log a parse error when reading the environment file.
+static void log_bad_env(int linenum)
+{
+ log(loglevel_t::ERROR, "invalid environment variable setting in environment file (line ", linenum, ")");
+}
+
+// Read and set environment variables from a file.
+static void read_env_file(const char *env_file_path)
+{
+ // Note that we can't use the log in this function; it hasn't been initialised yet.
+
+ std::ifstream env_file(env_file_path);
+ if (! env_file) return;
+
+ env_file.exceptions(std::ios::badbit);
+
+ auto &clocale = std::locale::classic();
+ std::string line;
+ int linenum = 0;
+
+ while (std::getline(env_file, line)) {
+ linenum++;
+ auto lpos = line.begin();
+ auto lend = line.end();
+ while (lpos != lend && std::isspace(*lpos, clocale)) {
+ ++lpos;
+ }
+
+ if (lpos != lend) {
+ if (*lpos != '#') {
+ if (*lpos == '=') {
+ log_bad_env(linenum);
+ continue;
+ }
+ auto name_begin = lpos++;
+ // skip until '=' or whitespace:
+ while (lpos != lend && *lpos != '=' && ! std::isspace(*lpos, clocale)) ++lpos;
+ auto name_end = lpos;
+ // skip whitespace:
+ while (lpos != lend && std::isspace(*lpos, clocale)) ++lpos;
+ if (lpos == lend) {
+ log_bad_env(linenum);
+ continue;
+ }
+
+ ++lpos;
+ auto val_begin = lpos;
+ while (lpos != lend && *lpos != '\n') ++lpos;
+ auto val_end = lpos;
+
+ std::string name = line.substr(name_begin - line.begin(), name_end - name_begin);
+ std::string value = line.substr(val_begin - line.begin(), val_end - val_begin);
+ if (setenv(name.c_str(), value.c_str(), true) == -1) {
+ throw std::system_error(errno, std::system_category());
+ }
+ }
+ }
+ }
+}
+
+// Get user confirmation before proceeding with restarting boot sequence.
+static void confirm_restart_boot() noexcept
+{
+ // Bypass log; we want to make certain the message is seen:
+ std::cout << "Press Enter to continue." << std::endl;
+
+ // Drain input, set non-blocking mode
+ tcflush(STDIN_FILENO, TCIFLUSH);
+ int origFlags = fcntl(STDIN_FILENO, F_GETFL);
+
+ console_input_io.set_enabled(event_loop, true);
+ do {
+ event_loop.run();
+ } while (! console_input_ready && services->get_shutdown_type() == shutdown_type_t::NONE);
+ console_input_io.set_enabled(event_loop, false);
+
+ // We either have input, or shutdown type has been set, or both.
+ if (console_input_ready) {
+ char buf[1];
+ read(STDIN_FILENO, buf, 1); // read a single character, to make sure we wait for input
+ tcflush(STDIN_FILENO, TCIFLUSH); // discard the rest of input
+ console_input_ready = false;
+ }
+
+ fcntl(STDIN_FILENO, F_SETFL, origFlags);
+}
+
// Callback for control socket
-static void control_socket_cb(EventLoop_t *loop, int sockfd)
+static void control_socket_cb(eventloop_t *loop, int sockfd)
{
- // TODO limit the number of active connections. Keep a tally, and disable the
- // control connection listening socket watcher if it gets high, and re-enable
- // it once it falls below the maximum.
+ // Considered keeping a limit the number of active connections, however, there doesn't
+ // seem much to be gained from that. Only root can create connections and not being
+ // able to establish a control connection is as much a denial-of-service as is not being
+ // able to start a service due to lack of fd's.
// Accept a connection
- int newfd = accept4(sockfd, nullptr, nullptr, SOCK_NONBLOCK | SOCK_CLOEXEC);
+ int newfd = dinit_accept4(sockfd, nullptr, nullptr, SOCK_NONBLOCK | SOCK_CLOEXEC);
if (newfd != -1) {
try {
- new ControlConn(loop, service_set, newfd); // will delete itself when it's finished
+ new control_conn_t(*loop, services, newfd); // will delete itself when it's finished
}
catch (std::exception &exc) {
- log(LogLevel::ERROR, "Accepting control connection: ", exc.what());
+ log(loglevel_t::ERROR, "Accepting control connection: ", exc.what());
close(newfd);
}
}
}
-static void open_control_socket(EventLoop_t *loop) noexcept
+// Callback when the root filesystem is read/write:
+void rootfs_is_rw() noexcept
+{
+ open_control_socket(true);
+ if (! did_log_boot) {
+ did_log_boot = log_boot();
+ }
+}
+
+// Open/create the control socket, normally /dev/dinitctl, used to allow client programs to connect
+// and issue service orders and shutdown commands etc. This can safely be called multiple times;
+// once the socket has been successfully opened, further calls have no effect.
+static void open_control_socket(bool report_ro_failure) noexcept
{
+ if (control_socket_open) {
+ struct stat stat_buf;
+ if (stat(control_socket_path, &stat_buf) != 0 && errno == ENOENT) {
+ // Looks like our control socket has disappeared from the filesystem. Close our control
+ // socket and re-create it:
+ control_socket_io.deregister(event_loop);
+ close(control_socket_io.get_watched_fd());
+ control_socket_open = false; // now re-open below
+ }
+ }
+
if (! control_socket_open) {
const char * saddrname = control_socket_path;
- uint sockaddr_size = offsetof(struct sockaddr_un, sun_path) + strlen(saddrname) + 1;
+ size_t saddrname_len = strlen(saddrname);
+ uint sockaddr_size = offsetof(struct sockaddr_un, sun_path) + saddrname_len + 1;
struct sockaddr_un * name = static_cast<sockaddr_un *>(malloc(sockaddr_size));
if (name == nullptr) {
- log(LogLevel::ERROR, "Opening control socket: out of memory");
+ log(loglevel_t::ERROR, "Opening control socket: out of memory");
return;
}
}
name->sun_family = AF_UNIX;
- strcpy(name->sun_path, saddrname);
+ memcpy(name->sun_path, saddrname, saddrname_len + 1);
- // OpenBSD and Linux both allow combining NONBLOCK/CLOEXEC flags with socket type, however
- // it's not actually POSIX. (TODO).
- int sockfd = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 0);
+ int sockfd = dinit_socket(AF_UNIX, SOCK_STREAM, 0, SOCK_NONBLOCK | SOCK_CLOEXEC);
if (sockfd == -1) {
- log(LogLevel::ERROR, "Error creating control socket: ", strerror(errno));
+ log(loglevel_t::ERROR, "Error creating control socket: ", strerror(errno));
free(name);
return;
}
if (bind(sockfd, (struct sockaddr *) name, sockaddr_size) == -1) {
- log(LogLevel::ERROR, "Error binding control socket: ", strerror(errno));
+ if (errno != EROFS || report_ro_failure) {
+ log(loglevel_t::ERROR, "Error binding control socket: ", strerror(errno));
+ }
close(sockfd);
free(name);
return;
// No connections can be made until we listen, so it is fine to change the permissions now
// (and anyway there is no way to atomically create the socket and set permissions):
if (chmod(saddrname, S_IRUSR | S_IWUSR) == -1) {
- log(LogLevel::ERROR, "Error setting control socket permissions: ", strerror(errno));
+ log(loglevel_t::ERROR, "Error setting control socket permissions: ", strerror(errno));
close(sockfd);
return;
}
if (listen(sockfd, 10) == -1) {
- log(LogLevel::ERROR, "Error listening on control socket: ", strerror(errno));
+ log(loglevel_t::ERROR, "Error listening on control socket: ", strerror(errno));
close(sockfd);
return;
}
- control_socket_open = true;
- control_socket_io.registerWith(&eventLoop, sockfd, IN_EVENTS);
+ try {
+ control_socket_io.add_watch(event_loop, sockfd, dasynq::IN_EVENTS);
+ control_socket_open = true;
+ }
+ catch (std::exception &e)
+ {
+ log(loglevel_t::ERROR, "Could not setup I/O on control socket: ", e.what());
+ close(sockfd);
+ }
}
}
-static void close_control_socket(EventLoop_t *loop) noexcept
+static void close_control_socket() noexcept
{
if (control_socket_open) {
- int fd = control_socket_io.fd;
- control_socket_io.deregisterWatch(&eventLoop);
+ int fd = control_socket_io.get_watched_fd();
+ control_socket_io.deregister(event_loop);
close(fd);
// Unlink the socket:
unlink(control_socket_path);
+
+ control_socket_open = false;
}
}
-static void setup_external_log() noexcept
+void setup_external_log() noexcept
{
if (! external_log_open) {
-
- const char * saddrname = log_socket_path;
- uint sockaddr_size = offsetof(struct sockaddr_un, sun_path) + strlen(saddrname) + 1;
-
- struct sockaddr_un * name = static_cast<sockaddr_un *>(malloc(sockaddr_size));
- if (name == nullptr) {
- log(LogLevel::ERROR, "Connecting to log socket: out of memory");
- return;
- }
-
- name->sun_family = AF_UNIX;
- strcpy(name->sun_path, saddrname);
-
- int sockfd = socket(AF_UNIX, SOCK_DGRAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 0);
- if (sockfd == -1) {
- log(LogLevel::ERROR, "Error creating log socket: ", strerror(errno));
- free(name);
- return;
- }
-
- if (connect(sockfd, (struct sockaddr *) name, sockaddr_size) == 0 || errno == EINPROGRESS) {
- // TODO for EINPROGRESS, set up a watcher so we can properly wait until
- // connection is established (or fails) before we pass it to the logging subsystem.
- try {
- setup_main_log(sockfd);
+ if (log_is_syslog) {
+ const char * saddrname = log_path;
+ size_t saddrname_len = strlen(saddrname);
+ uint sockaddr_size = offsetof(struct sockaddr_un, sun_path) + saddrname_len + 1;
+
+ struct sockaddr_un * name = static_cast<sockaddr_un *>(malloc(sockaddr_size));
+ if (name == nullptr) {
+ log(loglevel_t::ERROR, "Connecting to log socket: out of memory");
+ return;
}
- catch (std::exception &e) {
- log(LogLevel::ERROR, "Setting up log failed: ", e.what());
+
+ name->sun_family = AF_UNIX;
+ memcpy(name->sun_path, saddrname, saddrname_len + 1);
+
+ int sockfd = dinit_socket(AF_UNIX, SOCK_DGRAM, 0, SOCK_NONBLOCK | SOCK_CLOEXEC);
+ if (sockfd == -1) {
+ log(loglevel_t::ERROR, "Error creating log socket: ", strerror(errno));
+ free(name);
+ return;
+ }
+
+ if (connect(sockfd, (struct sockaddr *) name, sockaddr_size) == 0 || errno == EINPROGRESS) {
+ // For EINPROGRESS, connection is still being established; however, we can select on
+ // the file descriptor so we will be notified when it's ready. In other words we can
+ // basically use it anyway.
+ try {
+ setup_main_log(sockfd);
+ external_log_open = true;
+ }
+ catch (std::exception &e) {
+ log(loglevel_t::ERROR, "Setting up log failed: ", e.what());
+ close(sockfd);
+ }
+ }
+ else {
+ // Note if connect fails, we haven't warned at all, because the syslog server might not
+ // have started yet.
close(sockfd);
}
+
+ free(name);
}
else {
- // Note if connect fails, we haven't warned at all, because the syslog server might not
- // have started yet. TODO, have a special startup flag to indicate when syslog should
- // be available.
- close(sockfd);
+ // log to file:
+ int log_fd = open(log_path, O_WRONLY | O_CREAT | O_APPEND | O_NONBLOCK | O_CLOEXEC, 0644);
+ if (log_fd >= 0) {
+ try {
+ setup_main_log(log_fd);
+ external_log_open = true;
+ }
+ catch (std::exception &e) {
+ log(loglevel_t::ERROR, "Setting up log failed: ", e.what());
+ close(log_fd);
+ }
+ }
+ else {
+ // log failure to log? It makes more sense than first appears, because we also log
+ // to console:
+ log(loglevel_t::ERROR, "Setting up log failed: ", strerror(errno));
+ }
}
-
- free(name);
}
}
-// Called from service when the system is "rw ready" (filesystem mounted r/w etc).
-// May be called more than once.
-void system_rw_ready() noexcept
-{
- open_control_socket(&eventLoop);
- setup_external_log();
-}
-
-/* handle SIGINT signal (generated by kernel when ctrl+alt+del pressed) */
-static void sigint_reboot_cb(EventLoop_t *eloop) noexcept
+/* handle SIGINT signal (generated by Linux kernel when ctrl+alt+del pressed) */
+static void sigint_reboot_cb(eventloop_t &eloop) noexcept
{
- service_set->stop_all_services(ShutdownType::REBOOT);
+ services->stop_all_services(shutdown_type_t::REBOOT);
}
/* handle SIGQUIT (if we are system init) */
-static void sigquit_cb(EventLoop_t *eloop) noexcept
+static void sigquit_cb(eventloop_t &eloop) noexcept
{
- // This allows remounting the filesystem read-only if the dinit binary has been
- // unlinked. In that case the kernel holds the binary open, so that it can't be
- // properly removed.
- close_control_socket(eloop);
- execl("/sbin/shutdown", "/sbin/shutdown", (char *) 0);
- log(LogLevel::ERROR, "Error executing /sbin/shutdown: ", strerror(errno));
+ // This performs an immediate shutdown, without service rollback.
+ close_control_socket();
+ constexpr auto shutdown_exec = literal(SBINDIR) + "/shutdown";
+ execl(shutdown_exec.c_str(), shutdown_exec.c_str(), "--system", (char *) 0);
+ log(loglevel_t::ERROR, literal("Error executing ") + SBINDIR + "/sbin/shutdown: ", strerror(errno));
+ sync(); // since a hard poweroff might be required at this point...
}
-/* handle SIGTERM/SIGQUIT - stop all services (not used for system daemon) */
-static void sigterm_cb(EventLoop_t *eloop) noexcept
+/* handle SIGTERM/SIGQUIT(non-system-daemon) - stop all services and shut down */
+static void sigterm_cb(eventloop_t &eloop) noexcept
{
- service_set->stop_all_services();
+ services->stop_all_services();
}
projects / oweals / dinit.git / blobdiff