sysv: implement /dev/initctl compatibility
This commit is contained in:
Lennart Poettering
parent
0fd030bea1
commit
0b7964b804
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@ -1,4 +1,5 @@
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systemd-cgroups-agent
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systemd-initctl
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systemd
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*.o
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test-engine
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14
Makefile.am
14
Makefile.am
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@ -37,7 +37,8 @@ bin_PROGRAMS = \
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pkglibexec_PROGRAMS = \
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systemd-logger \
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systemd-cgroups-agent
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systemd-cgroups-agent \
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systemd-initctl
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noinst_PROGRAMS = \
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test-engine \
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@ -137,6 +138,17 @@ systemd_logger_SOURCES = \
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$(BASIC_SOURCES) \
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logger.c
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systemd_initctl_SOURCES = \
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$(BASIC_SOURCES) \
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initctl.c
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systemd_initctl_CPPFLAGS = \
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$(AM_CPPFLAGS) \
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$(DBUS_CFLAGS)
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systemd_initctl_LDADD = \
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$(DBUS_LIBS)
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systemd_cgroups_agent_SOURCES = \
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$(BASIC_SOURCES) \
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cgroups-agent.c
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@ -0,0 +1,437 @@
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/*-*- Mode: C; c-basic-offset: 8 -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <assert.h>
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#include <time.h>
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#include <string.h>
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#include <stdio.h>
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#include <errno.h>
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#include <unistd.h>
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#include <sys/poll.h>
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#include <sys/epoll.h>
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#include <sys/un.h>
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#include <fcntl.h>
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#include <ctype.h>
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#include <dbus/dbus.h>
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#include "util.h"
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#include "log.h"
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#include "list.h"
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#include "initreq.h"
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#define SERVER_FD_START 3
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#define SERVER_FD_MAX 16
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#define TIMEOUT ((int) (10*MSEC_PER_SEC))
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typedef struct Fifo Fifo;
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typedef struct Server {
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int epoll_fd;
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LIST_HEAD(Fifo, fifos);
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unsigned n_fifos;
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DBusConnection *bus;
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} Server;
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struct Fifo {
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Server *server;
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int fd;
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struct init_request buffer;
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size_t bytes_read;
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LIST_FIELDS(Fifo, fifo);
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};
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static const char *translate_runlevel(int runlevel) {
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switch (runlevel) {
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case '0':
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return "halt.target";
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case '1':
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case 's':
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case 'S':
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return "rescue.target";
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case '2':
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return "runlevel2.target";
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case '3':
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return "runlevel3.target";
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case '4':
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return "runlevel4.target";
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case '5':
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return "runlevel5.target";
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case '6':
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return "reboot.target";
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default:
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return NULL;
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}
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}
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static void change_runlevel(Server *s, int runlevel) {
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const char *target;
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DBusMessage *m = NULL, *reply = NULL;
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DBusError error;
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const char *path, *replace = "replace";
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assert(s);
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dbus_error_init(&error);
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if (!(target = translate_runlevel(runlevel))) {
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log_warning("Got request for unknown runlevel %c, ignoring.", runlevel);
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goto finish;
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}
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log_debug("Running request %s", target);
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if (!(m = dbus_message_new_method_call("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1", "GetUnit"))) {
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log_error("Could not allocate message.");
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goto finish;
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}
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if (!dbus_message_append_args(m,
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DBUS_TYPE_STRING, &target,
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DBUS_TYPE_INVALID)) {
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log_error("Could not attach group information to signal message.");
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goto finish;
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}
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if (!(reply = dbus_connection_send_with_reply_and_block(s->bus, m, -1, &error))) {
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log_error("Failed to get unit path: %s", error.message);
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goto finish;
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}
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if (!dbus_message_get_args(reply, &error,
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DBUS_TYPE_OBJECT_PATH, &path,
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DBUS_TYPE_INVALID)) {
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log_error("Failed to parse unit path: %s", error.message);
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goto finish;
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}
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dbus_message_unref(m);
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if (!(m = dbus_message_new_method_call("org.freedesktop.systemd1", path, "org.freedesktop.systemd1.Unit", "Start"))) {
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log_error("Could not allocate message.");
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goto finish;
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}
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if (!dbus_message_append_args(m,
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DBUS_TYPE_STRING, &replace,
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DBUS_TYPE_INVALID)) {
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log_error("Could not attach group information to signal message.");
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goto finish;
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}
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dbus_message_unref(reply);
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if (!(reply = dbus_connection_send_with_reply_and_block(s->bus, m, -1, &error))) {
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log_error("Failed to start unit: %s", error.message);
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goto finish;
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}
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finish:
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if (m)
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dbus_message_unref(m);
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if (reply)
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dbus_message_unref(reply);
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dbus_error_free(&error);
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}
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static void request_process(Server *s, const struct init_request *req) {
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assert(s);
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assert(req);
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if (req->magic != INIT_MAGIC) {
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log_error("Got initctl request with invalid magic. Ignoring.");
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return;
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}
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switch (req->cmd) {
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case INIT_CMD_RUNLVL:
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if (!isprint(req->runlevel))
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log_error("Got invalid runlevel. Ignoring.");
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else
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change_runlevel(s, req->runlevel);
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return;
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case INIT_CMD_POWERFAIL:
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case INIT_CMD_POWERFAILNOW:
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case INIT_CMD_POWEROK:
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log_warning("Received UPS/power initctl request. This is not implemented in systemd. Upgrade your UPS daemon!");
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return;
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case INIT_CMD_CHANGECONS:
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log_warning("Received console change initctl request. This is not implemented in systemd.");
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return;
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case INIT_CMD_SETENV:
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case INIT_CMD_UNSETENV:
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log_warning("Received environment initctl request. This is not implemented in systemd.");
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return;
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default:
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log_warning("Received unknown initctl request. Ignoring.");
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return;
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}
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}
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static int fifo_process(Fifo *f) {
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ssize_t l;
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assert(f);
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errno = EIO;
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if ((l = read(f->fd, ((uint8_t*) &f->buffer) + f->bytes_read, sizeof(f->buffer) - f->bytes_read)) <= 0) {
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if (errno == EAGAIN)
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return 0;
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log_warning("Failed to read from fifo: %s", strerror(errno));
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return -1;
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}
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f->bytes_read += l;
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assert(f->bytes_read <= sizeof(f->buffer));
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if (f->bytes_read == sizeof(f->buffer)) {
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request_process(f->server, &f->buffer);
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f->bytes_read = 0;
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}
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return 0;
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}
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static void fifo_free(Fifo *f) {
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assert(f);
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if (f->server) {
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assert(f->server->n_fifos > 0);
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f->server->n_fifos--;
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LIST_REMOVE(Fifo, fifo, f->server->fifos, f);
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}
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if (f->fd >= 0) {
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if (f->server)
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epoll_ctl(f->server->epoll_fd, EPOLL_CTL_DEL, f->fd, NULL);
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assert_se(close_nointr(f->fd) == 0);
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}
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free(f);
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}
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static int verify_environment(unsigned *n_sockets) {
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unsigned long long pid;
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const char *e;
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int r;
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unsigned ns;
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assert_se(n_sockets);
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if (!(e = getenv("LISTEN_PID"))) {
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log_error("Missing $LISTEN_PID environment variable.");
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return -ENOENT;
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}
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if ((r = safe_atollu(e, &pid)) < 0) {
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log_error("Failed to parse $LISTEN_PID: %s", strerror(-r));
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return r;
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}
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if (pid != (unsigned long long) getpid()) {
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log_error("Socket nor for me.");
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return -ENOENT;
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}
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if (!(e = getenv("LISTEN_FDS"))) {
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log_error("Missing $LISTEN_FDS environment variable.");
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return -ENOENT;
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}
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if ((r = safe_atou(e, &ns)) < 0) {
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log_error("Failed to parse $LISTEN_FDS: %s", strerror(-r));
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return -E2BIG;
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}
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if (ns <= 0 || ns > SERVER_FD_MAX) {
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log_error("Wrong number of file descriptors passed: %s", e);
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return -E2BIG;
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}
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*n_sockets = ns;
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return 0;
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}
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static void server_done(Server *s) {
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assert(s);
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while (s->fifos)
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fifo_free(s->fifos);
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if (s->epoll_fd >= 0)
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assert_se(close_nointr(s->epoll_fd) == 0);
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if (s->bus)
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dbus_connection_unref(s->bus);
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}
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static int server_init(Server *s, unsigned n_sockets) {
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int r;
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unsigned i;
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DBusError error;
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assert(s);
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assert(n_sockets > 0);
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dbus_error_init(&error);
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zero(*s);
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if ((s->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0) {
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r = -errno;
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log_error("Failed to create epoll object: %s", strerror(errno));
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goto fail;
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}
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for (i = 0; i < n_sockets; i++) {
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struct epoll_event ev;
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Fifo *f;
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if (!(f = new0(Fifo, 1))) {
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r = -ENOMEM;
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log_error("Failed to create fifo object: %s", strerror(errno));
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goto fail;
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}
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f->fd = -1;
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zero(ev);
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ev.events = EPOLLIN;
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ev.data.ptr = f;
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if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, SERVER_FD_START+i, &ev) < 0) {
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r = -errno;
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fifo_free(f);
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log_error("Failed to add fifo fd to epoll object: %s", strerror(errno));
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goto fail;
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}
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f->fd = SERVER_FD_START+i;
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LIST_PREPEND(Fifo, fifo, s->fifos, f);
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f->server = s;
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s->n_fifos ++;
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}
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if (!(s->bus = dbus_bus_get(DBUS_BUS_SYSTEM, &error))) {
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log_error("Failed to get D-Bus connection: %s", error.message);
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goto fail;
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}
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return 0;
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fail:
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server_done(s);
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dbus_error_free(&error);
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return r;
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}
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static int process_event(Server *s, struct epoll_event *ev) {
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int r;
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Fifo *f;
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assert(s);
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if (!(ev->events & EPOLLIN)) {
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log_info("Got invalid event from epoll. (3)");
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return -EIO;
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}
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f = (Fifo*) ev->data.ptr;
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if ((r = fifo_process(f)) < 0) {
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log_info("Got error on fifo: %s", strerror(-r));
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fifo_free(f);
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return r;
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}
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return 0;
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}
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int main(int argc, char *argv[]) {
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Server server;
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int r = 3;
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unsigned n;
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log_info("systemd-initctl running as pid %llu", (unsigned long long) getpid());
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if (verify_environment(&n) < 0)
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return 1;
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if (server_init(&server, n) < 0)
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return 2;
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|
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for (;;) {
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struct epoll_event event;
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int k;
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if ((k = epoll_wait(server.epoll_fd,
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&event, 1,
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TIMEOUT)) < 0) {
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|
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if (errno == EINTR)
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continue;
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|
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log_error("epoll_wait() failed: %s", strerror(errno));
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goto fail;
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}
|
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|
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if (k <= 0)
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break;
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|
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if ((k = process_event(&server, &event)) < 0)
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goto fail;
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}
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r = 0;
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fail:
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server_done(&server);
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log_info("systemd-initctl stopped as pid %llu", (unsigned long long) getpid());
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dbus_shutdown();
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return r;
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}
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|
|
@ -0,0 +1,77 @@
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/*
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* initreq.h Interface to talk to init through /dev/initctl.
|
||||
*
|
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* Copyright (C) 1995-2004 Miquel van Smoorenburg
|
||||
*
|
||||
* This library 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 of the License, or (at your option) any later version.
|
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*
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* Version: @(#)initreq.h 1.28 31-Mar-2004 MvS
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*
|
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*/
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#ifndef _INITREQ_H
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#define _INITREQ_H
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|
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#include <sys/param.h>
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|
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#if defined(__FreeBSD_kernel__)
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# define INIT_FIFO "/etc/.initctl"
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#else
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# define INIT_FIFO "/dev/initctl"
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#endif
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|
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#define INIT_MAGIC 0x03091969
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#define INIT_CMD_START 0
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#define INIT_CMD_RUNLVL 1
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#define INIT_CMD_POWERFAIL 2
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#define INIT_CMD_POWERFAILNOW 3
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#define INIT_CMD_POWEROK 4
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#define INIT_CMD_BSD 5
|
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#define INIT_CMD_SETENV 6
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#define INIT_CMD_UNSETENV 7
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|
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#define INIT_CMD_CHANGECONS 12345
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|
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#ifdef MAXHOSTNAMELEN
|
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# define INITRQ_HLEN MAXHOSTNAMELEN
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#else
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# define INITRQ_HLEN 64
|
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#endif
|
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|
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/*
|
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* This is what BSD 4.4 uses when talking to init.
|
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* Linux doesn't use this right now.
|
||||
*/
|
||||
struct init_request_bsd {
|
||||
char gen_id[8]; /* Beats me.. telnetd uses "fe" */
|
||||
char tty_id[16]; /* Tty name minus /dev/tty */
|
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char host[INITRQ_HLEN]; /* Hostname */
|
||||
char term_type[16]; /* Terminal type */
|
||||
int signal; /* Signal to send */
|
||||
int pid; /* Process to send to */
|
||||
char exec_name[128]; /* Program to execute */
|
||||
char reserved[128]; /* For future expansion. */
|
||||
};
|
||||
|
||||
|
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/*
|
||||
* Because of legacy interfaces, "runlevel" and "sleeptime"
|
||||
* aren't in a seperate struct in the union.
|
||||
*
|
||||
* The weird sizes are because init expects the whole
|
||||
* struct to be 384 bytes.
|
||||
*/
|
||||
struct init_request {
|
||||
int magic; /* Magic number */
|
||||
int cmd; /* What kind of request */
|
||||
int runlevel; /* Runlevel to change to */
|
||||
int sleeptime; /* Time between TERM and KILL */
|
||||
union {
|
||||
struct init_request_bsd bsd;
|
||||
char data[368];
|
||||
} i;
|
||||
};
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue