+++ /dev/null
-/*-*- 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 <stdio.h>
-#include <errno.h>
-#include <unistd.h>
-#include <sys/epoll.h>
-#include <ctype.h>
-
-#include "sd-daemon.h"
-#include "sd-bus.h"
-
-#include "util.h"
-#include "log.h"
-#include "list.h"
-#include "initreq.h"
-#include "special.h"
-#include "bus-util.h"
-#include "bus-error.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;
-
- sd_bus *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_MULTI_USER_TARGET, true },
- { '3', SPECIAL_MULTI_USER_TARGET, true },
- { '4', SPECIAL_MULTI_USER_TARGET, true },
- { '5', SPECIAL_GRAPHICAL_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;
- _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
- const char *mode;
- bool isolate = false;
- int r;
-
- assert(s);
-
- target = translate_runlevel(runlevel, &isolate);
- if (!target) {
- log_warning("Got request for unknown runlevel %c, ignoring.", runlevel);
- return;
- }
-
- if (isolate)
- mode = "isolate";
- else
- mode = "replace-irreversibly";
-
- log_debug("Running request %s/start/%s", target, mode);
-
- r = sd_bus_call_method(
- s->bus,
- "org.freedesktop.systemd1",
- "/org/freedesktop/systemd1",
- "org.freedesktop.systemd1.Manager",
- "StartUnit",
- &error,
- NULL,
- "ss", target, mode);
- if (r < 0) {
- log_error("Failed to change runlevel: %s", bus_error_message(&error, -r));
- return;
- }
-}
-
-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_errno(errno, "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_errno(errno, "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;
- l = read(f->fd,
- ((uint8_t*) &f->buffer) + f->bytes_read,
- sizeof(f->buffer) - f->bytes_read);
- if (l <= 0) {
- if (errno == EAGAIN)
- return 0;
-
- log_warning_errno(errno, "Failed to read from fifo: %m");
- return -errno;
- }
-
- 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, f->server->fifos, f);
- }
-
- if (f->fd >= 0) {
- if (f->server)
- epoll_ctl(f->server->epoll_fd, EPOLL_CTL_DEL, f->fd, NULL);
-
- safe_close(f->fd);
- }
-
- free(f);
-}
-
-static void server_done(Server *s) {
- assert(s);
-
- while (s->fifos)
- fifo_free(s->fifos);
-
- safe_close(s->epoll_fd);
-
- if (s->bus) {
- sd_bus_flush(s->bus);
- sd_bus_unref(s->bus);
- }
-}
-
-static int server_init(Server *s, unsigned n_sockets) {
- int r;
- unsigned i;
-
- assert(s);
- assert(n_sockets > 0);
-
- zero(*s);
-
- s->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
- if (s->epoll_fd < 0) {
- r = -errno;
- log_error_errno(errno, "Failed to create epoll object: %m");
- goto fail;
- }
-
- for (i = 0; i < n_sockets; i++) {
- struct epoll_event ev;
- Fifo *f;
- int fd;
-
- fd = SD_LISTEN_FDS_START+i;
-
- r = sd_is_fifo(fd, NULL);
- if (r < 0) {
- log_error_errno(r, "Failed to determine file descriptor type: %m");
- goto fail;
- }
-
- if (!r) {
- log_error("Wrong file descriptor type.");
- r = -EINVAL;
- goto fail;
- }
-
- f = new0(Fifo, 1);
- if (!f) {
- r = -ENOMEM;
- log_error_errno(errno, "Failed to create fifo object: %m");
- 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_errno(errno, "Failed to add fifo fd to epoll object: %m");
- goto fail;
- }
-
- f->fd = fd;
- LIST_PREPEND(fifo, s->fifos, f);
- f->server = s;
- s->n_fifos ++;
- }
-
- r = bus_open_system_systemd(&s->bus);
- if (r < 0) {
- log_error_errno(r, "Failed to get D-Bus connection: %m");
- r = -EIO;
- goto fail;
- }
-
- return 0;
-
-fail:
- server_done(s);
-
- 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;
- r = fifo_process(f);
- if (r < 0) {
- log_info_errno(r, "Got error on fifo: %m");
- 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);
-
- n = sd_listen_fds(true);
- if (n < 0) {
- log_error_errno(r, "Failed to read listening file descriptors from environment: %m");
- 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 "PID_FMT, 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_errno(errno, "epoll_wait() failed: %m");
- goto fail;
- }
-
- if (k <= 0)
- break;
-
- if (process_event(&server, &event) < 0)
- goto fail;
- }
-
- r = EXIT_SUCCESS;
-
- log_debug("systemd-initctl stopped as pid "PID_FMT, getpid());
-
-fail:
- sd_notify(false,
- "STOPPING=1\n"
- "STATUS=Shutting down...");
-
- server_done(&server);
-
- return r;
-}
~ianmdlvl / elogind.git / commitdiff