+++ /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 <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 "util.h"
-#include "log.h"
-#include "list.h"
-#include "initreq.h"
-#include "manager.h"
-#include "sd-daemon.h"
-
-#define SERVER_FD_MAX 16
-#define TIMEOUT ((int) (10*MSEC_PER_SEC))
-
-typedef struct Fifo Fifo;
-
-typedef struct Server {
- int epoll_fd;
-
- LIST_HEAD(Fifo, fifos);
- unsigned n_fifos;
-
- DBusConnection *bus;
-} 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) {
- static const struct {
- const int runlevel;
- const char *special;
- } table[] = {
- { '0', SPECIAL_RUNLEVEL0_TARGET },
- { '1', SPECIAL_RUNLEVEL1_TARGET },
- { 's', SPECIAL_RUNLEVEL1_TARGET },
- { 'S', SPECIAL_RUNLEVEL1_TARGET },
- { '2', SPECIAL_RUNLEVEL2_TARGET },
- { '3', SPECIAL_RUNLEVEL3_TARGET },
- { '4', SPECIAL_RUNLEVEL4_TARGET },
- { '5', SPECIAL_RUNLEVEL5_TARGET },
- { '6', SPECIAL_RUNLEVEL6_TARGET },
- };
-
- unsigned i;
-
- for (i = 0; i < ELEMENTSOF(table); i++)
- if (table[i].runlevel == runlevel)
- 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 *path, *replace = "isolate";
-
- assert(s);
-
- dbus_error_init(&error);
-
- if (!(target = translate_runlevel(runlevel))) {
- log_warning("Got request for unknown runlevel %c, ignoring.", runlevel);
- goto finish;
- }
-
- log_debug("Running request %s", target);
-
- if (!(m = dbus_message_new_method_call("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "LoadUnit"))) {
- log_error("Could not allocate message.");
- goto finish;
- }
-
- if (!dbus_message_append_args(m,
- DBUS_TYPE_STRING, &target,
- DBUS_TYPE_INVALID)) {
- log_error("Could not attach group information to signal message.");
- goto finish;
- }
-
- if (!(reply = dbus_connection_send_with_reply_and_block(s->bus, m, -1, &error))) {
- log_error("Failed to get unit path: %s", error.message);
- goto finish;
- }
-
- if (!dbus_message_get_args(reply, &error,
- DBUS_TYPE_OBJECT_PATH, &path,
- DBUS_TYPE_INVALID)) {
- log_error("Failed to parse unit path: %s", error.message);
- goto finish;
- }
-
- dbus_message_unref(m);
- if (!(m = dbus_message_new_method_call("org.freedesktop.systemd1", path, "org.freedesktop.systemd1.Unit", "Start"))) {
- log_error("Could not allocate message.");
- goto finish;
- }
-
- if (!dbus_message_append_args(m,
- DBUS_TYPE_STRING, &replace,
- DBUS_TYPE_INVALID)) {
- log_error("Could not attach group information to signal message.");
- goto finish;
- }
-
- dbus_message_unref(reply);
- if (!(reply = dbus_connection_send_with_reply_and_block(s->bus, m, -1, &error))) {
- log_error("Failed to start unit: %s", error.message);
- 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
- 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_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;
-
- 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, SD_LISTEN_FDS_START+i, &ev) < 0) {
- r = -errno;
- fifo_free(f);
- log_error("Failed to add fifo fd to epoll object: %s", strerror(errno));
- goto fail;
- }
-
- f->fd = SD_LISTEN_FDS_START+i;
- LIST_PREPEND(Fifo, fifo, s->fifos, f);
- f->server = s;
- s->n_fifos ++;
- }
-
- if (!(s->bus = dbus_bus_get(DBUS_BUS_SYSTEM, &error))) {
- log_error("Failed to get D-Bus connection: %s", error.message);
- 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 = 3, n;
-
- log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
- log_parse_environment();
-
- log_info("systemd-initctl running as pid %llu", (unsigned long long) getpid());
-
- if ((n = sd_listen_fds(true)) < 0) {
- log_error("Failed to read listening file descriptors from environment: %s", strerror(-r));
- return 1;
- }
-
- if (n <= 0 || n > SERVER_FD_MAX) {
- log_error("No or too many file descriptors passed.");
- return 2;
- }
-
- if (server_init(&server, (unsigned) n) < 0)
- return 2;
-
- for (;;) {
- struct epoll_event event;
- int k;
-
- if ((k = epoll_wait(server.epoll_fd,
- &event, 1,
- TIMEOUT)) < 0) {
-
- if (errno == EINTR)
- continue;
-
- log_error("epoll_wait() failed: %s", strerror(errno));
- goto fail;
- }
-
- if (k <= 0)
- break;
-
- if ((k = process_event(&server, &event)) < 0)
- goto fail;
- }
- r = 0;
-
-fail:
- server_done(&server);
-
- log_info("systemd-initctl stopped as pid %llu", (unsigned long long) getpid());
-
- dbus_shutdown();
-
- return r;
-}
~ianmdlvl / elogind.git / blobdiff