nspawn-register.c revision 4afd3348c7506dd1d36305b7bcb9feb8952b9d6b
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2015 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 "sd-bus.h"
#include "bus-error.h"
#include "bus-util.h"
#include "nspawn-register.h"
#include "stat-util.h"
#include "strv.h"
#include "util.h"
int register_machine(
const char *machine_name,
pid_t pid,
const char *directory,
sd_id128_t uuid,
int local_ifindex,
const char *slice,
CustomMount *mounts,
unsigned n_mounts,
int kill_signal,
char **properties,
bool keep_unit,
const char *service) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
_cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
int r;
r = sd_bus_default_system(&bus);
if (r < 0)
return log_error_errno(r, "Failed to open system bus: %m");
if (keep_unit) {
r = sd_bus_call_method(
bus,
"org.freedesktop.machine1",
"/org/freedesktop/machine1",
"org.freedesktop.machine1.Manager",
"RegisterMachineWithNetwork",
&error,
NULL,
"sayssusai",
machine_name,
SD_BUS_MESSAGE_APPEND_ID128(uuid),
service,
"container",
(uint32_t) pid,
strempty(directory),
local_ifindex > 0 ? 1 : 0, local_ifindex);
} else {
_cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
char **i;
unsigned j;
r = sd_bus_message_new_method_call(
bus,
&m,
"org.freedesktop.machine1",
"/org/freedesktop/machine1",
"org.freedesktop.machine1.Manager",
"CreateMachineWithNetwork");
if (r < 0)
return bus_log_create_error(r);
r = sd_bus_message_append(
m,
"sayssusai",
machine_name,
SD_BUS_MESSAGE_APPEND_ID128(uuid),
service,
"container",
(uint32_t) pid,
strempty(directory),
local_ifindex > 0 ? 1 : 0, local_ifindex);
if (r < 0)
return bus_log_create_error(r);
r = sd_bus_message_open_container(m, 'a', "(sv)");
if (r < 0)
return bus_log_create_error(r);
if (!isempty(slice)) {
r = sd_bus_message_append(m, "(sv)", "Slice", "s", slice);
if (r < 0)
return bus_log_create_error(r);
}
r = sd_bus_message_append(m, "(sv)", "TasksMax", "t", 8192);
if (r < 0)
return bus_log_create_error(r);
r = sd_bus_message_append(m, "(sv)", "DevicePolicy", "s", "strict");
if (r < 0)
return bus_log_create_error(r);
/* If you make changes here, also make sure to update
* systemd-nspawn@.service, to keep the device
* policies in sync regardless if we are run with or
* without the --keep-unit switch. */
r = sd_bus_message_append(m, "(sv)", "DeviceAllow", "a(ss)", 9,
/* Allow the container to
* access and create the API
* device nodes, so that
* PrivateDevices= in the
* container can work
* fine */
"/dev/null", "rwm",
"/dev/zero", "rwm",
"/dev/full", "rwm",
"/dev/random", "rwm",
"/dev/urandom", "rwm",
"/dev/tty", "rwm",
"/dev/net/tun", "rwm",
/* Allow the container
* access to ptys. However,
* do not permit the
* container to ever create
* these device nodes. */
"/dev/pts/ptmx", "rw",
"char-pts", "rw");
if (r < 0)
return bus_log_create_error(r);
for (j = 0; j < n_mounts; j++) {
CustomMount *cm = mounts + j;
if (cm->type != CUSTOM_MOUNT_BIND)
continue;
r = is_device_node(cm->source);
if (r < 0)
return log_error_errno(r, "Failed to stat %s: %m", cm->source);
if (r) {
r = sd_bus_message_append(m, "(sv)", "DeviceAllow", "a(ss)", 1,
cm->source, cm->read_only ? "r" : "rw");
if (r < 0)
return log_error_errno(r, "Failed to append message arguments: %m");
}
}
if (kill_signal != 0) {
r = sd_bus_message_append(m, "(sv)", "KillSignal", "i", kill_signal);
if (r < 0)
return bus_log_create_error(r);
r = sd_bus_message_append(m, "(sv)", "KillMode", "s", "mixed");
if (r < 0)
return bus_log_create_error(r);
}
STRV_FOREACH(i, properties) {
r = sd_bus_message_open_container(m, 'r', "sv");
if (r < 0)
return bus_log_create_error(r);
r = bus_append_unit_property_assignment(m, *i);
if (r < 0)
return r;
r = sd_bus_message_close_container(m);
if (r < 0)
return bus_log_create_error(r);
}
r = sd_bus_message_close_container(m);
if (r < 0)
return bus_log_create_error(r);
r = sd_bus_call(bus, m, 0, &error, NULL);
}
if (r < 0) {
log_error("Failed to register machine: %s", bus_error_message(&error, r));
return r;
}
return 0;
}
int terminate_machine(pid_t pid) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
_cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
const char *path;
int r;
r = sd_bus_default_system(&bus);
if (r < 0)
return log_error_errno(r, "Failed to open system bus: %m");
r = sd_bus_call_method(
bus,
"org.freedesktop.machine1",
"/org/freedesktop/machine1",
"org.freedesktop.machine1.Manager",
"GetMachineByPID",
&error,
&reply,
"u",
(uint32_t) pid);
if (r < 0) {
/* Note that the machine might already have been
* cleaned up automatically, hence don't consider it a
* failure if we cannot get the machine object. */
log_debug("Failed to get machine: %s", bus_error_message(&error, r));
return 0;
}
r = sd_bus_message_read(reply, "o", &path);
if (r < 0)
return bus_log_parse_error(r);
r = sd_bus_call_method(
bus,
"org.freedesktop.machine1",
path,
"org.freedesktop.machine1.Machine",
"Terminate",
&error,
NULL,
NULL);
if (r < 0) {
log_debug("Failed to terminate machine: %s", bus_error_message(&error, r));
return 0;
}
return 0;
}