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-rw-r--r--src/initctl/initctl.c451
1 files changed, 451 insertions, 0 deletions
diff --git a/src/initctl/initctl.c b/src/initctl/initctl.c
new file mode 100644
index 0000000000..0eb008d9e6
--- /dev/null
+++ b/src/initctl/initctl.c
@@ -0,0 +1,451 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ 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 Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <assert.h>
+#include <time.h>
+#include <string.h>
+#include <stdio.h>
+#include <errno.h>
+#include <unistd.h>
+#include <sys/poll.h>
+#include <sys/epoll.h>
+#include <sys/un.h>
+#include <fcntl.h>
+#include <ctype.h>
+
+#include <dbus/dbus.h>
+#include <systemd/sd-daemon.h>
+
+#include "util.h"
+#include "log.h"
+#include "list.h"
+#include "initreq.h"
+#include "special.h"
+#include "dbus-common.h"
+#include "def.h"
+
+#define SERVER_FD_MAX 16
+#define TIMEOUT_MSEC ((int) (DEFAULT_EXIT_USEC/USEC_PER_MSEC))
+
+typedef struct Fifo Fifo;
+
+typedef struct Server {
+ int epoll_fd;
+
+ LIST_HEAD(Fifo, fifos);
+ unsigned n_fifos;
+
+ DBusConnection *bus;
+
+ bool quit;
+} Server;
+
+struct Fifo {
+ Server *server;
+
+ int fd;
+
+ struct init_request buffer;
+ size_t bytes_read;
+
+ LIST_FIELDS(Fifo, fifo);
+};
+
+static const char *translate_runlevel(int runlevel, bool *isolate) {
+ static const struct {
+ const int runlevel;
+ const char *special;
+ bool isolate;
+ } table[] = {
+ { '0', SPECIAL_POWEROFF_TARGET, false },
+ { '1', SPECIAL_RESCUE_TARGET, true },
+ { 's', SPECIAL_RESCUE_TARGET, true },
+ { 'S', SPECIAL_RESCUE_TARGET, true },
+ { '2', SPECIAL_RUNLEVEL2_TARGET, true },
+ { '3', SPECIAL_RUNLEVEL3_TARGET, true },
+ { '4', SPECIAL_RUNLEVEL4_TARGET, true },
+ { '5', SPECIAL_RUNLEVEL5_TARGET, true },
+ { '6', SPECIAL_REBOOT_TARGET, false },
+ };
+
+ unsigned i;
+
+ assert(isolate);
+
+ for (i = 0; i < ELEMENTSOF(table); i++)
+ if (table[i].runlevel == runlevel) {
+ *isolate = table[i].isolate;
+ if (runlevel == '6' && kexec_loaded())
+ return SPECIAL_KEXEC_TARGET;
+ return table[i].special;
+ }
+
+ return NULL;
+}
+
+static void change_runlevel(Server *s, int runlevel) {
+ const char *target;
+ DBusMessage *m = NULL, *reply = NULL;
+ DBusError error;
+ const char *mode;
+ bool isolate = false;
+
+ assert(s);
+
+ dbus_error_init(&error);
+
+ if (!(target = translate_runlevel(runlevel, &isolate))) {
+ log_warning("Got request for unknown runlevel %c, ignoring.", runlevel);
+ goto finish;
+ }
+
+ if (isolate)
+ mode = "isolate";
+ else
+ mode = "replace";
+
+ log_debug("Running request %s/start/%s", target, mode);
+
+ if (!(m = dbus_message_new_method_call("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "StartUnit"))) {
+ log_error("Could not allocate message.");
+ goto finish;
+ }
+
+ if (!dbus_message_append_args(m,
+ DBUS_TYPE_STRING, &target,
+ DBUS_TYPE_STRING, &mode,
+ DBUS_TYPE_INVALID)) {
+ log_error("Could not attach target and flag information to message.");
+ goto finish;
+ }
+
+ if (!(reply = dbus_connection_send_with_reply_and_block(s->bus, m, -1, &error))) {
+ log_error("Failed to start unit: %s", bus_error_message(&error));
+ goto finish;
+ }
+
+finish:
+ if (m)
+ dbus_message_unref(m);
+
+ if (reply)
+ dbus_message_unref(reply);
+
+ dbus_error_free(&error);
+}
+
+static void request_process(Server *s, const struct init_request *req) {
+ assert(s);
+ assert(req);
+
+ if (req->magic != INIT_MAGIC) {
+ log_error("Got initctl request with invalid magic. Ignoring.");
+ return;
+ }
+
+ switch (req->cmd) {
+
+ case INIT_CMD_RUNLVL:
+ if (!isprint(req->runlevel))
+ log_error("Got invalid runlevel. Ignoring.");
+ else
+ switch (req->runlevel) {
+
+ /* we are async anyway, so just use kill for reexec/reload */
+ case 'u':
+ case 'U':
+ if (kill(1, SIGTERM) < 0)
+ log_error("kill() failed: %m");
+
+ /* The bus connection will be
+ * terminated if PID 1 is reexecuted,
+ * hence let's just exit here, and
+ * rely on that we'll be restarted on
+ * the next request */
+ s->quit = true;
+ break;
+
+ case 'q':
+ case 'Q':
+ if (kill(1, SIGHUP) < 0)
+ log_error("kill() failed: %m");
+ break;
+
+ default:
+ change_runlevel(s, req->runlevel);
+ }
+ return;
+
+ case INIT_CMD_POWERFAIL:
+ case INIT_CMD_POWERFAILNOW:
+ case INIT_CMD_POWEROK:
+ log_warning("Received UPS/power initctl request. This is not implemented in systemd. Upgrade your UPS daemon!");
+ return;
+
+ case INIT_CMD_CHANGECONS:
+ log_warning("Received console change initctl request. This is not implemented in systemd.");
+ return;
+
+ case INIT_CMD_SETENV:
+ case INIT_CMD_UNSETENV:
+ log_warning("Received environment initctl request. This is not implemented in systemd.");
+ return;
+
+ default:
+ log_warning("Received unknown initctl request. Ignoring.");
+ return;
+ }
+}
+
+static int fifo_process(Fifo *f) {
+ ssize_t l;
+
+ assert(f);
+
+ errno = EIO;
+ if ((l = read(f->fd, ((uint8_t*) &f->buffer) + f->bytes_read, sizeof(f->buffer) - f->bytes_read)) <= 0) {
+
+ if (errno == EAGAIN)
+ return 0;
+
+ log_warning("Failed to read from fifo: %s", strerror(errno));
+ return -1;
+ }
+
+ f->bytes_read += l;
+ assert(f->bytes_read <= sizeof(f->buffer));
+
+ if (f->bytes_read == sizeof(f->buffer)) {
+ request_process(f->server, &f->buffer);
+ f->bytes_read = 0;
+ }
+
+ return 0;
+}
+
+static void fifo_free(Fifo *f) {
+ assert(f);
+
+ if (f->server) {
+ assert(f->server->n_fifos > 0);
+ f->server->n_fifos--;
+ LIST_REMOVE(Fifo, fifo, f->server->fifos, f);
+ }
+
+ if (f->fd >= 0) {
+ if (f->server)
+ epoll_ctl(f->server->epoll_fd, EPOLL_CTL_DEL, f->fd, NULL);
+
+ close_nointr_nofail(f->fd);
+ }
+
+ free(f);
+}
+
+static void server_done(Server *s) {
+ assert(s);
+
+ while (s->fifos)
+ fifo_free(s->fifos);
+
+ if (s->epoll_fd >= 0)
+ close_nointr_nofail(s->epoll_fd);
+
+ if (s->bus) {
+ dbus_connection_flush(s->bus);
+ dbus_connection_close(s->bus);
+ dbus_connection_unref(s->bus);
+ }
+}
+
+static int server_init(Server *s, unsigned n_sockets) {
+ int r;
+ unsigned i;
+ DBusError error;
+
+ assert(s);
+ assert(n_sockets > 0);
+
+ dbus_error_init(&error);
+
+ zero(*s);
+
+ if ((s->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0) {
+ r = -errno;
+ log_error("Failed to create epoll object: %s", strerror(errno));
+ goto fail;
+ }
+
+ for (i = 0; i < n_sockets; i++) {
+ struct epoll_event ev;
+ Fifo *f;
+ int fd;
+
+ fd = SD_LISTEN_FDS_START+i;
+
+ if ((r = sd_is_fifo(fd, NULL)) < 0) {
+ log_error("Failed to determine file descriptor type: %s", strerror(-r));
+ goto fail;
+ }
+
+ if (!r) {
+ log_error("Wrong file descriptor type.");
+ r = -EINVAL;
+ goto fail;
+ }
+
+ if (!(f = new0(Fifo, 1))) {
+ r = -ENOMEM;
+ log_error("Failed to create fifo object: %s", strerror(errno));
+ goto fail;
+ }
+
+ f->fd = -1;
+
+ zero(ev);
+ ev.events = EPOLLIN;
+ ev.data.ptr = f;
+ if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) {
+ r = -errno;
+ fifo_free(f);
+ log_error("Failed to add fifo fd to epoll object: %s", strerror(errno));
+ goto fail;
+ }
+
+ f->fd = fd;
+ LIST_PREPEND(Fifo, fifo, s->fifos, f);
+ f->server = s;
+ s->n_fifos ++;
+ }
+
+ if (bus_connect(DBUS_BUS_SYSTEM, &s->bus, NULL, &error) < 0) {
+ log_error("Failed to get D-Bus connection: %s", bus_error_message(&error));
+ goto fail;
+ }
+
+ return 0;
+
+fail:
+ server_done(s);
+
+ dbus_error_free(&error);
+ return r;
+}
+
+static int process_event(Server *s, struct epoll_event *ev) {
+ int r;
+ Fifo *f;
+
+ assert(s);
+
+ if (!(ev->events & EPOLLIN)) {
+ log_info("Got invalid event from epoll. (3)");
+ return -EIO;
+ }
+
+ f = (Fifo*) ev->data.ptr;
+
+ if ((r = fifo_process(f)) < 0) {
+ log_info("Got error on fifo: %s", strerror(-r));
+ fifo_free(f);
+ return r;
+ }
+
+ return 0;
+}
+
+int main(int argc, char *argv[]) {
+ Server server;
+ int r = EXIT_FAILURE, n;
+
+ if (getppid() != 1) {
+ log_error("This program should be invoked by init only.");
+ return EXIT_FAILURE;
+ }
+
+ if (argc > 1) {
+ log_error("This program does not take arguments.");
+ return EXIT_FAILURE;
+ }
+
+ log_set_target(LOG_TARGET_AUTO);
+ log_parse_environment();
+ log_open();
+
+ umask(0022);
+
+ if ((n = sd_listen_fds(true)) < 0) {
+ log_error("Failed to read listening file descriptors from environment: %s", strerror(-r));
+ return EXIT_FAILURE;
+ }
+
+ if (n <= 0 || n > SERVER_FD_MAX) {
+ log_error("No or too many file descriptors passed.");
+ return EXIT_FAILURE;
+ }
+
+ if (server_init(&server, (unsigned) n) < 0)
+ return EXIT_FAILURE;
+
+ log_debug("systemd-initctl running as pid %lu", (unsigned long) getpid());
+
+ sd_notify(false,
+ "READY=1\n"
+ "STATUS=Processing requests...");
+
+ while (!server.quit) {
+ struct epoll_event event;
+ int k;
+
+ if ((k = epoll_wait(server.epoll_fd,
+ &event, 1,
+ TIMEOUT_MSEC)) < 0) {
+
+ if (errno == EINTR)
+ continue;
+
+ log_error("epoll_wait() failed: %s", strerror(errno));
+ goto fail;
+ }
+
+ if (k <= 0)
+ break;
+
+ if (process_event(&server, &event) < 0)
+ goto fail;
+ }
+
+ r = EXIT_SUCCESS;
+
+ log_debug("systemd-initctl stopped as pid %lu", (unsigned long) getpid());
+
+fail:
+ sd_notify(false,
+ "STATUS=Shutting down...");
+
+ server_done(&server);
+
+ dbus_shutdown();
+
+ return r;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-15 12:33:31 +0000