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bus: add API call to create bus connection to the system bus of local containers

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Also, add support for this to machinectl, so that we can enumerate the
machines that run inside a container. We must go deeper!
This commit is contained in:
Lennart Poettering 2013-10-30 15:34:50 +01:00
parent 0f8bd8debb
commit a7893c6b28
10 changed files with 349 additions and 97 deletions
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2
Makefile.am
View File

@ -1947,6 +1947,8 @@ libsystemd_bus_la_SOURCES = \
src/libsystemd-bus/bus-socket.h \
src/libsystemd-bus/bus-kernel.c \
src/libsystemd-bus/bus-kernel.h \
src/libsystemd-bus/bus-container.c \
src/libsystemd-bus/bus-container.h \
src/libsystemd-bus/bus-message.c \
src/libsystemd-bus/bus-message.h \
src/libsystemd-bus/bus-signature.c \

75
man/machinectl.xml
View File

@ -86,6 +86,42 @@
string and exits.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--no-pager</option></term>
<listitem><para>Do not pipe output into a
pager.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--no-ask-password</option></term>
<listitem><para>Do not query the user
for authentication for privileged
operations.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>-H</option></term>
<term><option>--host=</option></term>
<listitem><para>Execute operation
remotely. Specify a hostname, or
username and hostname separated by <literal>@</literal>,
to connect to. This will use SSH to
talk to the remote machine manager
instance.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>-M</option></term>
<term><option>--machine=</option></term>
<listitem><para>Execute operation on a
local container. Specify a container
name to connect to.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>-p</option></term>
<term><option>--property=</option></term>
@ -122,21 +158,6 @@
</listitem>
</varlistentry>
<varlistentry>
<term><option>--no-pager</option></term>
<listitem><para>Do not pipe output into a
pager.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--no-ask-password</option></term>
<listitem><para>Do not query the user
for authentication for privileged
operations.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--kill-who=</option></term>
@ -167,26 +188,6 @@
<constant>SIGTERM</constant>.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>-H</option></term>
<term><option>--host</option></term>
<listitem><para>Execute operation
remotely. Specify a hostname, or
username and hostname separated by <literal>@</literal>,
to connect to. This will use SSH to
talk to the remote machine manager
instance.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>-P</option></term>
<term><option>--privileged</option></term>
<listitem><para>Acquire privileges via
PolicyKit before executing the
operation.</para></listitem>
</varlistentry>
</variablelist>
<para>The following commands are understood:</para>
@ -293,8 +294,8 @@
<title>See Also</title>
<para>
<citerefentry><refentrytitle>systemd-machined.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd-logind.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>.
<citerefentry><refentrytitle>systemd-nspawn</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>
</para>
</refsect1>

128
src/libsystemd-bus/bus-container.c Normal file
View File

@ -0,0 +1,128 @@
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2013 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 <unistd.h>
#include <fcntl.h>
#include "util.h"
#include "fileio.h"
#include "bus-internal.h"
#include "bus-socket.h"
#include "bus-container.h"
int bus_container_connect(sd_bus *b) {
_cleanup_free_ char *p = NULL, *s = NULL, *ns = NULL, *root = NULL, *class = NULL;
_cleanup_close_ int nsfd = -1, rootfd = -1;
siginfo_t si;
pid_t leader, child;
int r;
assert(b);
assert(b->input_fd < 0);
assert(b->output_fd < 0);
p = strappend("/run/systemd/machines/", b->machine);
if (!p)
return -ENOMEM;
r = parse_env_file(p, NEWLINE, "LEADER", &s, "CLASS", &class, NULL);
if (r < 0)
return r;
if (!s)
return -EIO;
if (!streq_ptr(class, "container"))
return -EIO;
r = parse_pid(s, &leader);
if (r < 0)
return r;
if (leader <= 1)
return -EIO;
r = asprintf(&ns, "/proc/%lu/ns/mnt", (unsigned long) leader);
if (r < 0)
return -ENOMEM;
nsfd = open(ns, O_RDONLY|O_NOCTTY|O_CLOEXEC);
if (nsfd < 0)
return -errno;
r = asprintf(&root, "/proc/%lu/root", (unsigned long) leader);
if (r < 0)
return -ENOMEM;
rootfd = open(root, O_RDONLY|O_NOCTTY|O_CLOEXEC);
if (rootfd < 0)
return -errno;
b->input_fd = socket(b->sockaddr.sa.sa_family, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
if (b->input_fd < 0)
return -errno;
b->output_fd = b->input_fd;
r = bus_socket_setup(b);
if (r < 0)
return r;
child = fork();
if (child < 0)
return -errno;
if (child == 0) {
r = setns(nsfd, CLONE_NEWNS);
if (r < 0)
_exit(255);
if (fchdir(rootfd) < 0)
_exit(255);
if (chroot(".") < 0)
_exit(255);
r = connect(b->input_fd, &b->sockaddr.sa, b->sockaddr_size);
if (r < 0) {
if (errno == EINPROGRESS)
_exit(1);
_exit(255);
}
_exit(0);
}
r = wait_for_terminate(child, &si);
if (r < 0)
return r;
if (si.si_code != CLD_EXITED)
return -EIO;
if (si.si_status == 1)
return 1;
if (si.si_status != 0)
return -EIO;
return bus_socket_start_auth(b);
}

26
src/libsystemd-bus/bus-container.h Normal file
View File

@ -0,0 +1,26 @@
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
#pragma once
/***
This file is part of systemd.
Copyright 2013 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"
int bus_container_connect(sd_bus *b);

1
src/libsystemd-bus/bus-internal.h
View File

@ -196,6 +196,7 @@ struct sd_bus {
socklen_t sockaddr_size;
char *kernel;
char *machine;
sd_id128_t server_id;

4
src/libsystemd-bus/bus-socket.c
View File

@ -600,7 +600,7 @@ static int bus_socket_read_auth(sd_bus *b) {
return 1;
}
static int bus_socket_setup(sd_bus *b) {
int bus_socket_setup(sd_bus *b) {
int enable;
socklen_t l;
@ -668,7 +668,7 @@ static int bus_socket_start_auth_client(sd_bus *b) {
return bus_socket_write_auth(b);
}
static int bus_socket_start_auth(sd_bus *b) {
int bus_socket_start_auth(sd_bus *b) {
assert(b);
b->state = BUS_AUTHENTICATING;

2
src/libsystemd-bus/bus-socket.h
View File

@ -23,9 +23,11 @@
#include "sd-bus.h"
int bus_socket_setup(sd_bus *b);
int bus_socket_connect(sd_bus *b);
int bus_socket_exec(sd_bus *b);
int bus_socket_take_fd(sd_bus *b);
int bus_socket_start_auth(sd_bus *b);
int bus_socket_write_message(sd_bus *bus, sd_bus_message *m, size_t *idx);
int bus_socket_read_message(sd_bus *bus, sd_bus_message **m);

115
src/libsystemd-bus/sd-bus.c
View File

@ -46,6 +46,7 @@
#include "bus-signature.h"
#include "bus-objects.h"
#include "bus-util.h"
#include "bus-container.h"
static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec);
@ -117,6 +118,7 @@ static void bus_free(sd_bus *b) {
free(b->auth_buffer);
free(b->address);
free(b->kernel);
free(b->machine);
free(b->exec_path);
strv_free(b->exec_argv);
@ -753,6 +755,45 @@ static int parse_kernel_address(sd_bus *b, const char **p, char **guid) {
return 0;
}
static int parse_container_address(sd_bus *b, const char **p, char **guid) {
_cleanup_free_ char *machine = NULL;
int r;
assert(b);
assert(p);
assert(*p);
assert(guid);
while (**p != 0 && **p != ';') {
r = parse_address_key(p, "guid", guid);
if (r < 0)
return r;
else if (r > 0)
continue;
r = parse_address_key(p, "machine", &machine);
if (r < 0)
return r;
else if (r > 0)
continue;
skip_address_key(p);
}
if (!machine)
return -EINVAL;
free(b->machine);
b->machine = machine;
machine = NULL;
b->sockaddr.un.sun_family = AF_UNIX;
strncpy(b->sockaddr.un.sun_path, "/var/run/dbus/system_bus_socket", sizeof(b->sockaddr.un.sun_path));
b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + sizeof("/var/run/dbus/system_bus_socket") - 1;
return 0;
}
static void bus_reset_parsed_address(sd_bus *b) {
assert(b);
@ -765,6 +806,8 @@ static void bus_reset_parsed_address(sd_bus *b) {
b->server_id = SD_ID128_NULL;
free(b->kernel);
b->kernel = NULL;
free(b->machine);
b->machine = NULL;
}
static int bus_parse_next_address(sd_bus *b) {
@ -823,6 +866,14 @@ static int bus_parse_next_address(sd_bus *b) {
if (r < 0)
return r;
break;
} else if (startswith(a, "x-container:")) {
a += 12;
r = parse_container_address(b, &a, &guid);
if (r < 0)
return r;
break;
}
@ -849,15 +900,7 @@ static int bus_start_address(sd_bus *b) {
for (;;) {
sd_bus_close(b);
if (b->sockaddr.sa.sa_family != AF_UNSPEC) {
r = bus_socket_connect(b);
if (r >= 0)
return r;
b->last_connect_error = -r;
} else if (b->exec_path) {
if (b->exec_path) {
r = bus_socket_exec(b);
if (r >= 0)
@ -871,6 +914,22 @@ static int bus_start_address(sd_bus *b) {
return r;
b->last_connect_error = -r;
} else if (b->machine) {
r = bus_container_connect(b);
if (r >= 0)
return r;
b->last_connect_error = -r;
} else if (b->sockaddr.sa.sa_family != AF_UNSPEC) {
r = bus_socket_connect(b);
if (r >= 0)
return r;
b->last_connect_error = -r;
}
r = bus_parse_next_address(b);
@ -937,7 +996,7 @@ int sd_bus_start(sd_bus *bus) {
if (bus->input_fd >= 0)
r = bus_start_fd(bus);
else if (bus->address || bus->sockaddr.sa.sa_family != AF_UNSPEC || bus->exec_path || bus->kernel)
else if (bus->address || bus->sockaddr.sa.sa_family != AF_UNSPEC || bus->exec_path || bus->kernel || bus->machine)
r = bus_start_address(bus);
else
return -EINVAL;
@ -1069,6 +1128,42 @@ int sd_bus_open_system_remote(const char *host, sd_bus **ret) {
return 0;
}
int sd_bus_open_system_container(const char *machine, sd_bus **ret) {
_cleanup_free_ char *e = NULL;
sd_bus *bus;
char *p;
int r;
assert_return(machine, -EINVAL);
assert_return(ret, -EINVAL);
e = bus_address_escape(machine);
if (!e)
return -ENOMEM;
p = strjoin("x-container:machine=", e, NULL);
if (!p)
return -ENOMEM;
r = sd_bus_new(&bus);
if (r < 0) {
free(p);
return r;
}
bus->address = p;
bus->bus_client = true;
r = sd_bus_start(bus);
if (r < 0) {
bus_free(bus);
return r;
}
*ret = bus;
return 0;
}
void sd_bus_close(sd_bus *bus) {
if (!bus)
return;

92
src/machine/machinectl.c
View File

@ -47,12 +47,12 @@ static bool arg_no_pager = false;
static const char *arg_kill_who = NULL;
static int arg_signal = SIGTERM;
static enum transport {
TRANSPORT_NORMAL,
TRANSPORT_SSH,
} arg_transport = TRANSPORT_NORMAL;
TRANSPORT_LOCAL,
TRANSPORT_REMOTE,
TRANSPORT_CONTAINER
} arg_transport = TRANSPORT_LOCAL;
static bool arg_ask_password = true;
static char *arg_host = NULL;
static char *arg_user = NULL;
static void pager_open_if_enabled(void) {
@ -94,9 +94,6 @@ static int list_machines(sd_bus *bus, char **args, unsigned n) {
goto fail;
while ((r = sd_bus_message_read(reply, "(ssso)", &name, &class, &service, &object)) > 0) {
if (r < 0)
goto fail;
printf("%-32s %-9s %-16s\n", name, class, service);
k++;
@ -115,7 +112,7 @@ static int list_machines(sd_bus *bus, char **args, unsigned n) {
fail:
log_error("Failed to parse reply: %s", strerror(-r));
return -EIO;
return r;
}
static int show_scope_cgroup(sd_bus *bus, const char *unit, pid_t leader) {
@ -129,30 +126,28 @@ static int show_scope_cgroup(sd_bus *bus, const char *unit, pid_t leader) {
assert(bus);
assert(unit);
if (arg_transport == TRANSPORT_SSH)
if (arg_transport == TRANSPORT_REMOTE)
return 0;
path = unit_dbus_path_from_name(unit);
if (!path)
return log_oom();
r = sd_bus_call_method(
r = sd_bus_get_property(
bus,
"org.freedesktop.systemd1",
path,
"org.freedesktop.DBus.Properties",
"Get",
"org.freedesktop.systemd1.Scope",
"ControlGroup",
&error,
&reply,
"ss",
"org.freedesktop.systemd1.Scope",
"ControlGroup");
"s");
if (r < 0) {
log_error("Failed to query ControlGroup: %s", bus_error_message(&error, -r));
return r;
}
r = sd_bus_message_read(reply, "v", "s", &cgroup);
r = sd_bus_message_read(reply, "s", &cgroup);
if (r < 0) {
log_error("Failed to parse reply: %s", strerror(-r));
return r;
@ -371,9 +366,6 @@ static int show_one(const char *verb, sd_bus *bus, const char *path, bool show_p
const char *name;
const char *contents;
if (r < 0)
goto fail;
r = sd_bus_message_read_basic(reply, SD_BUS_TYPE_STRING, &name);
if (r < 0)
goto fail;
@ -415,7 +407,7 @@ static int show_one(const char *verb, sd_bus *bus, const char *path, bool show_p
fail:
log_error("Failed to parse reply: %s", strerror(-r));
return -EIO;
return r;
}
static int show(sd_bus *bus, char **args, unsigned n) {
@ -460,7 +452,7 @@ static int show(sd_bus *bus, char **args, unsigned n) {
r = sd_bus_message_read(reply, "o", &path);
if (r < 0) {
log_error("Failed to parse reply: %s", strerror(-r));
return -EIO;
return r;
}
r = show_one(args[0], bus, path, show_properties, &new_line);
@ -534,14 +526,15 @@ static int help(void) {
"Send control commands to or query the virtual machine and container registration manager.\n\n"
" -h --help Show this help\n"
" --version Show package version\n"
" -p --property=NAME Show only properties by this name\n"
" -a --all Show all properties, including empty ones\n"
" --kill-who=WHO Who to send signal to\n"
" -l --full Do not ellipsize output\n"
" -s --signal=SIGNAL Which signal to send\n"
" --no-pager Do not pipe output into a pager\n"
" --no-ask-password Don't prompt for password\n"
" -H --host=[USER@]HOST Show information for remote host\n"
" --no-pager Do not pipe output into a pager\n\n"
" -M --machine=CONTAINER Show information for local container\n"
" -p --property=NAME Show only properties by this name\n"
" -a --all Show all properties, including empty ones\n"
" -l --full Do not ellipsize output\n"
" --kill-who=WHO Who to send signal to\n"
" -s --signal=SIGNAL Which signal to send\n\n"
"Commands:\n"
" list List running VMs and containers\n"
" status [NAME...] Show VM/container status\n"
@ -572,16 +565,17 @@ static int parse_argv(int argc, char *argv[]) {
{ "kill-who", required_argument, NULL, ARG_KILL_WHO },
{ "signal", required_argument, NULL, 's' },
{ "host", required_argument, NULL, 'H' },
{ "machine", required_argument, NULL, 'M' },
{ "no-ask-password", no_argument, NULL, ARG_NO_ASK_PASSWORD },
{ NULL, 0, NULL, 0 }
};
int c;
int c, r;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "hp:als:H:P", options, NULL)) >= 0) {
while ((c = getopt_long(argc, argv, "hp:als:H:M:", options, NULL)) >= 0) {
switch (c) {
@ -594,22 +588,16 @@ static int parse_argv(int argc, char *argv[]) {
puts(SYSTEMD_FEATURES);
return 0;
case 'p': {
char **l;
l = strv_append(arg_property, optarg);
if (!l)
return -ENOMEM;
strv_free(arg_property);
arg_property = l;
case 'p':
r = strv_extend(&arg_property, optarg);
if (r < 0)
return log_oom();
/* If the user asked for a particular
* property, show it to him, even if it is
* empty. */
arg_all = true;
break;
}
case 'a':
arg_all = true;
@ -640,8 +628,13 @@ static int parse_argv(int argc, char *argv[]) {
break;
case 'H':
arg_transport = TRANSPORT_SSH;
parse_user_at_host(optarg, &arg_user, &arg_host);
arg_transport = TRANSPORT_REMOTE;
arg_host = optarg;
break;
case 'M':
arg_transport = TRANSPORT_CONTAINER;
arg_host = optarg;
break;
case '?':
@ -741,7 +734,7 @@ static int machinectl_main(sd_bus *bus, int argc, char *argv[], const int r) {
}
int main(int argc, char*argv[]) {
int r, retval = EXIT_FAILURE;
int r, ret = EXIT_FAILURE;
_cleanup_bus_unref_ sd_bus *bus = NULL;
setlocale(LC_ALL, "");
@ -752,28 +745,31 @@ int main(int argc, char*argv[]) {
if (r < 0)
goto finish;
else if (r == 0) {
retval = EXIT_SUCCESS;
ret = EXIT_SUCCESS;
goto finish;
}
if (arg_transport == TRANSPORT_NORMAL)
if (arg_transport == TRANSPORT_LOCAL)
r = sd_bus_open_system(&bus);
else if (arg_transport == TRANSPORT_SSH)
else if (arg_transport == TRANSPORT_REMOTE)
r = sd_bus_open_system_remote(arg_host, &bus);
else if (arg_transport == TRANSPORT_CONTAINER)
r = sd_bus_open_system_container(arg_host, &bus);
else
assert_not_reached("Uh, invalid transport...");
if (r < 0) {
retval = EXIT_FAILURE;
log_error("Failed to connect to machined: %s", strerror(-r));
ret = EXIT_FAILURE;
goto finish;
}
r = machinectl_main(bus, argc, argv, r);
retval = r < 0 ? EXIT_FAILURE : r;
ret = r < 0 ? EXIT_FAILURE : r;
finish:
strv_free(arg_property);
pager_close();
return retval;
return ret;
}

1
src/systemd/sd-bus.h
View File

@ -61,6 +61,7 @@ typedef int (*sd_bus_node_enumerator_t) (sd_bus *bus, const char *path, char ***
int sd_bus_open_user(sd_bus **ret);
int sd_bus_open_system(sd_bus **ret);
int sd_bus_open_system_remote(const char *host, sd_bus **ret);
int sd_bus_open_system_container(const char *machine, sd_bus **ret);
int sd_bus_new(sd_bus **ret);
int sd_bus_set_address(sd_bus *bus, const char *address);