#include <sys/socket.h>

#include <unistd.h>

#include <errno.h>

#include <string.h>

#include <getopt.h>

#include <pwd.h>

#include <locale.h>

#include <fcntl.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <net/if.h>

#include "sd-bus.h"

#include "log.h"

#include "util.h"

#include "macro.h"

#include "pager.h"

#include "bus-util.h"

#include "bus-error.h"

#include "build.h"

#include "strv.h"

#include "unit-name.h"

#include "cgroup-show.h"

#include "cgroup-util.h"

#include "ptyfwd.h"

#include "event-util.h"

static char **arg_property = NULL;

static bool arg_all = false;

static bool arg_full = false;

static bool arg_no_pager = false;

static bool arg_legend = true;

static const char *arg_kill_who = NULL;

static int arg_signal = SIGTERM;

static BusTransport arg_transport = BUS_TRANSPORT_LOCAL;

static char *arg_host = NULL;

static void pager_open_if_enabled(void) {

/* Cache result before we open the pager */

if (arg_no_pager)

return;

pager_open(false);

}

static int list_machines(sd_bus *bus, char **args, unsigned n) {

_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;

_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;

const char *name, *class, *service, *object;

unsigned k = 0;

int r;

pager_open_if_enabled();

r = sd_bus_call_method(

bus,

"org.freedesktop.machine1",

"/org/freedesktop/machine1",

"org.freedesktop.machine1.Manager",

"ListMachines",

&error,

&reply,

"");

if (r < 0) {

log_error("Could not get machines: %s", bus_error_message(&error, -r));

return r;

}

if (arg_legend)

printf("%-32s %-9s %-16s\n", "MACHINE", "CONTAINER", "SERVICE");

r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_ARRAY, "(ssso)");

if (r < 0)

return bus_log_parse_error(r);

while ((r = sd_bus_message_read(reply, "(ssso)", &name, &class, &service, &object)) > 0) {

printf("%-32s %-9s %-16s\n", name, class, service);

k++;

}

if (r < 0)

return bus_log_parse_error(r);

r = sd_bus_message_exit_container(reply);

if (r < 0)

return bus_log_parse_error(r);

if (arg_legend)

printf("\n%u machines listed.\n", k);

return 0;

}

static int show_unit_cgroup(sd_bus *bus, const char *unit, pid_t leader) {

_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;

_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;

_cleanup_free_ char *path = NULL;

const char *cgroup;

int r, output_flags;

unsigned c;

assert(bus);

assert(unit);

if (arg_transport == BUS_TRANSPORT_REMOTE)

return 0;

path = unit_dbus_path_from_name(unit);

if (!path)

return log_oom();

r = sd_bus_get_property(

bus,

"org.freedesktop.systemd1",

path,

endswith(unit, ".scope") ? "org.freedesktop.systemd1.Scope" : "org.freedesktop.systemd1.Service",

"ControlGroup",

&error,

&reply,

"s");

if (r < 0) {

log_error("Failed to query ControlGroup: %s", bus_error_message(&error, -r));

return r;

}

r = sd_bus_message_read(reply, "s", &cgroup);

if (r < 0)

return bus_log_parse_error(r);

if (isempty(cgroup))

return 0;

if (cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, cgroup, false) != 0 && leader <= 0)

return 0;

output_flags =

arg_all * OUTPUT_SHOW_ALL |

arg_full * OUTPUT_FULL_WIDTH;

c = columns();

if (c > 18)

c -= 18;

else

c = 0;

show_cgroup_and_extra(SYSTEMD_CGROUP_CONTROLLER, cgroup, "\t\t ", c, false, &leader, leader > 0, output_flags);

return 0;

}

static int print_addresses(sd_bus *bus, const char *name, int ifi, const char *prefix, const char *prefix2) {

_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;

int r;

assert(bus);

assert(name);

assert(prefix);

assert(prefix2);

r = sd_bus_call_method(bus,

"org.freedesktop.machine1",

"/org/freedesktop/machine1",

"org.freedesktop.machine1.Manager",

"GetMachineAddresses",

NULL,

&reply,

"s", name);

if (r < 0)

return r;

r = sd_bus_message_enter_container(reply, 'a', "(iay)");

if (r < 0)

return bus_log_parse_error(r);

while ((r = sd_bus_message_enter_container(reply, 'r', "iay")) > 0) {

int family;

const void *a;

size_t sz;

char buffer[MAX(INET6_ADDRSTRLEN, INET_ADDRSTRLEN)];

r = sd_bus_message_read(reply, "i", &family);

if (r < 0)

return bus_log_parse_error(r);

r = sd_bus_message_read_array(reply, 'y', &a, &sz);

if (r < 0)

return bus_log_parse_error(r);

fputs(prefix, stdout);

fputs(inet_ntop(family, a, buffer, sizeof(buffer)), stdout);

if (family == AF_INET6 && ifi > 0)

printf("%%%i", ifi);

fputc('\n', stdout);

r = sd_bus_message_exit_container(reply);

if (r < 0)

return bus_log_parse_error(r);

if (prefix != prefix2)

prefix = prefix2;

}

if (r < 0)

return bus_log_parse_error(r);

r = sd_bus_message_exit_container(reply);

if (r < 0)

return bus_log_parse_error(r);

return 0;

}

static int print_os_release(sd_bus *bus, const char *name, const char *prefix) {

_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;

const char *k, *v, *pretty = NULL;

int r;

assert(bus);

assert(name);

assert(prefix);

r = sd_bus_call_method(bus,

"org.freedesktop.machine1",

"/org/freedesktop/machine1",

"org.freedesktop.machine1.Manager",

"GetMachineOSRelease",

NULL,

&reply,

"s", name);

if (r < 0)

return r;

r = sd_bus_message_enter_container(reply, 'a', "{ss}");

if (r < 0)

return bus_log_parse_error(r);

while ((r = sd_bus_message_read(reply, "{ss}", &k, &v)) > 0) {

if (streq(k, "PRETTY_NAME"))

pretty = v;

}

if (r < 0)

return bus_log_parse_error(r);

r = sd_bus_message_exit_container(reply);

if (r < 0)

return bus_log_parse_error(r);

if (pretty)

printf("%s%s\n", prefix, pretty);

return 0;

}

typedef struct MachineStatusInfo {

char *name;

sd_id128_t id;

char *class;

char *service;

char *unit;

char *root_directory;

pid_t leader;

usec_t timestamp;

int *netif;

unsigned n_netif;

} MachineStatusInfo;

static void print_machine_status_info(sd_bus *bus, MachineStatusInfo *i) {

char since1[FORMAT_TIMESTAMP_RELATIVE_MAX], *s1;

char since2[FORMAT_TIMESTAMP_MAX], *s2;

int ifi = -1;

assert(i);

fputs(strna(i->name), stdout);

if (!sd_id128_equal(i->id, SD_ID128_NULL))

printf("(" SD_ID128_FORMAT_STR ")\n", SD_ID128_FORMAT_VAL(i->id));

else

putchar('\n');

s1 = format_timestamp_relative(since1, sizeof(since1), i->timestamp);

s2 = format_timestamp(since2, sizeof(since2), i->timestamp);

if (s1)

printf("\t Since: %s; %s\n", s2, s1);

else if (s2)

printf("\t Since: %s\n", s2);

if (i->leader > 0) {

_cleanup_free_ char *t = NULL;

printf("\t Leader: %u", (unsigned) i->leader);

get_process_comm(i->leader, &t);

if (t)

printf(" (%s)", t);

putchar('\n');

}

if (i->service) {

printf("\t Service: %s", i->service);

if (i->class)

printf("; class %s", i->class);

putchar('\n');

} else if (i->class)

printf("\t Class: %s\n", i->class);

if (i->root_directory)

printf("\t Root: %s\n", i->root_directory);

if (i->n_netif > 0) {

unsigned c;

fputs("\t Iface:", stdout);

for (c = 0; c < i->n_netif; c++) {

char name[IF_NAMESIZE+1] = "";

if (if_indextoname(i->netif[c], name)) {

fputc(' ', stdout);

fputs(name, stdout);

if (ifi < 0)

ifi = i->netif[c];

else

ifi = 0;

} else

printf(" %i", i->netif[c]);

}

fputc('\n', stdout);

}

print_addresses(bus, i->name, ifi,

"\t Address: ",

"\t ");

print_os_release(bus, i->name, "\t OS: ");

if (i->unit) {

printf("\t Unit: %s\n", i->unit);

show_unit_cgroup(bus, i->unit, i->leader);

}

}

static int map_netif(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata) {

MachineStatusInfo *i = userdata;

size_t l;

const void *v;

int r;

assert_cc(sizeof(int32_t) == sizeof(int));

r = sd_bus_message_read_array(m, SD_BUS_TYPE_INT32, &v, &l);

if (r < 0)

return r;

if (r == 0)

return -EBADMSG;

i->n_netif = l / sizeof(int32_t);

i->netif = memdup(v, l);

if (!i->netif)

return -ENOMEM;

return 0;

}

static int show_info(const char *verb, sd_bus *bus, const char *path, bool *new_line) {

static const struct bus_properties_map map[] = {

{ "Name", "s", NULL, offsetof(MachineStatusInfo, name) },

{ "Class", "s", NULL, offsetof(MachineStatusInfo, class) },

{ "Service", "s", NULL, offsetof(MachineStatusInfo, service) },

{ "Unit", "s", NULL, offsetof(MachineStatusInfo, unit) },

{ "RootDirectory", "s", NULL, offsetof(MachineStatusInfo, root_directory) },

{ "Leader", "u", NULL, offsetof(MachineStatusInfo, leader) },

{ "Timestamp", "t", NULL, offsetof(MachineStatusInfo, timestamp) },

{ "Id", "ay", bus_map_id128, offsetof(MachineStatusInfo, id) },

{ "NetworkInterfaces", "ai", map_netif, 0 },

{}

};

MachineStatusInfo info = {};

int r;

assert(path);

assert(new_line);

r = bus_map_all_properties(bus,

"org.freedesktop.machine1",

path,

map,

&info);

if (r < 0) {

log_error_errno(-r, "Could not get properties: %m");

return r;

}

if (*new_line)

printf("\n");

*new_line = true;

print_machine_status_info(bus, &info);

free(info.name);

free(info.class);

free(info.service);

free(info.unit);

free(info.root_directory);

free(info.netif);

return r;

}

static int show_properties(sd_bus *bus, const char *path, bool *new_line) {

int r;

if (*new_line)

printf("\n");

*new_line = true;

r = bus_print_all_properties(bus, "org.freedesktop.machine1", path, arg_property, arg_all);

if (r < 0)

log_error_errno(-r, "Could not get properties: %m");

return r;

}

static int show(sd_bus *bus, char **args, unsigned n) {

_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;

_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;

int r = 0;

unsigned i;

bool properties, new_line = false;

assert(bus);

assert(args);

properties = !strstr(args[0], "status");

pager_open_if_enabled();

if (properties && n <= 1) {

/* If no argument is specified, inspect the manager

r = show_properties(bus, "/org/freedesktop/machine1", &new_line);

if (r < 0)

return r;

}

for (i = 1; i < n; i++) {

const char *path = NULL;

r = sd_bus_call_method(

bus,

"org.freedesktop.machine1",

"/org/freedesktop/machine1",

"org.freedesktop.machine1.Manager",

"GetMachine",

&error,

&reply,

"s", args[i]);

if (r < 0) {

log_error("Could not get path to machine: %s", bus_error_message(&error, -r));

return r;

}

r = sd_bus_message_read(reply, "o", &path);

if (r < 0)

return bus_log_parse_error(r);

if (properties)

r = show_properties(bus, path, &new_line);

else

r = show_info(args[0], bus, path, &new_line);

}

return r;

}

static int kill_machine(sd_bus *bus, char **args, unsigned n) {

_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;

unsigned i;

assert(args);

if (!arg_kill_who)

arg_kill_who = "all";

for (i = 1; i < n; i++) {

int r;

r = sd_bus_call_method(

bus,

"org.freedesktop.machine1",

"/org/freedesktop/machine1",

"org.freedesktop.machine1.Manager",

"KillMachine",

&error,

NULL,

"ssi", args[i], arg_kill_who, arg_signal);

if (r < 0) {

log_error("Could not kill machine: %s", bus_error_message(&error, -r));

return r;

}

}

return 0;

}

static int reboot_machine(sd_bus *bus, char **args, unsigned n) {

arg_kill_who = "leader";

arg_signal = SIGINT; /* sysvinit + systemd */

return kill_machine(bus, args, n);

}

static int poweroff_machine(sd_bus *bus, char **args, unsigned n) {

arg_kill_who = "leader";

arg_signal = SIGRTMIN+4; /* only systemd */

return kill_machine(bus, args, n);

}

static int terminate_machine(sd_bus *bus, char **args, unsigned n) {

_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;

unsigned i;

assert(args);

for (i = 1; i < n; i++) {

int r;

r = sd_bus_call_method(

bus,

"org.freedesktop.machine1",

"/org/freedesktop/machine1",

"org.freedesktop.machine1.Manager",

"TerminateMachine",

&error,

NULL,

"s", args[i]);

if (r < 0) {

log_error("Could not terminate machine: %s", bus_error_message(&error, -r));

return r;

}

}

return 0;

}

static int openpt_in_namespace(pid_t pid, int flags) {

_cleanup_close_pair_ int pair[2] = { -1, -1 };

_cleanup_close_ int pidnsfd = -1, mntnsfd = -1, rootfd = -1;

union {

struct cmsghdr cmsghdr;

uint8_t buf[CMSG_SPACE(sizeof(int))];

} control = {};

struct msghdr mh = {

.msg_control = &control,

.msg_controllen = sizeof(control),

};

struct cmsghdr *cmsg;

int master = -1, r;

pid_t child;

siginfo_t si;

r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &rootfd);

if (r < 0)

return r;

if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0)

return -errno;

child = fork();

if (child < 0)

return -errno;

if (child == 0) {

pair[0] = safe_close(pair[0]);

r = namespace_enter(pidnsfd, mntnsfd, -1, rootfd);

if (r < 0)

_exit(EXIT_FAILURE);

master = posix_openpt(flags);

if (master < 0)

_exit(EXIT_FAILURE);

cmsg = CMSG_FIRSTHDR(&mh);

cmsg->cmsg_level = SOL_SOCKET;

cmsg->cmsg_type = SCM_RIGHTS;

cmsg->cmsg_len = CMSG_LEN(sizeof(int));

memcpy(CMSG_DATA(cmsg), &master, sizeof(int));

mh.msg_controllen = cmsg->cmsg_len;

if (sendmsg(pair[1], &mh, MSG_NOSIGNAL) < 0)

_exit(EXIT_FAILURE);

_exit(EXIT_SUCCESS);

}

pair[1] = safe_close(pair[1]);

r = wait_for_terminate(child, &si);

if (r < 0)

return r;

if (si.si_code != CLD_EXITED || si.si_status != EXIT_SUCCESS)

return -EIO;

if (recvmsg(pair[0], &mh, MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) < 0)

return -errno;

for (cmsg = CMSG_FIRSTHDR(&mh); cmsg; cmsg = CMSG_NXTHDR(&mh, cmsg))

if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_RIGHTS) {

int *fds;

unsigned n_fds;

fds = (int*) CMSG_DATA(cmsg);

n_fds = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int);

if (n_fds != 1) {

close_many(fds, n_fds);

return -EIO;

}

master = fds[0];

}

if (master < 0)

return -EIO;

return master;

}

static int login_machine(sd_bus *bus, char **args, unsigned n) {

_cleanup_bus_message_unref_ sd_bus_message *reply = NULL, *reply2 = NULL, *reply3 = NULL;

_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;

_cleanup_bus_close_unref_ sd_bus *container_bus = NULL;

_cleanup_(pty_forward_freep) PTYForward *forward = NULL;

_cleanup_event_unref_ sd_event *event = NULL;

_cleanup_close_ int master = -1;

_cleanup_free_ char *getty = NULL;

const char *path, *pty, *p;

uint32_t leader;

sigset_t mask;

int r, ret = 0;

assert(bus);

assert(args);

if (arg_transport != BUS_TRANSPORT_LOCAL) {

log_error("Login only supported on local machines.");

return -ENOTSUP;

}

r = sd_event_default(&event);

if (r < 0) {

log_error_errno(-r, "Failed to get event loop: %m");

return r;

}

r = sd_bus_attach_event(bus, event, 0);

if (r < 0) {

log_error_errno(-r, "Failed to attach bus to event loop: %m");

return r;

}

r = sd_bus_call_method(

bus,

"org.freedesktop.machine1",

"/org/freedesktop/machine1",

"org.freedesktop.machine1.Manager",

"GetMachine",

&error,

&reply,

"s", args[1]);

if (r < 0) {

log_error("Could not get path to machine: %s", bus_error_message(&error, -r));

return r;

}

r = sd_bus_message_read(reply, "o", &path);

if (r < 0)

return bus_log_parse_error(r);

r = sd_bus_get_property(

bus,

"org.freedesktop.machine1",

path,

"org.freedesktop.machine1.Machine",

"Leader",

&error,

&reply2,

"u");

if (r < 0) {

log_error_errno(-r, "Failed to retrieve PID of leader: %m");

return r;

}

r = sd_bus_message_read(reply2, "u", &leader);

if (r < 0)

return bus_log_parse_error(r);

master = openpt_in_namespace(leader, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NDELAY);

if (master < 0) {

log_error_errno(-master, "Failed to acquire pseudo tty: %m");

return master;

}

pty = ptsname(master);

if (!pty) {

log_error("Failed to get pty name: %m");

return -errno;

}

p = startswith(pty, "/dev/pts/");

if (!p) {

log_error("Invalid pty name %s.", pty);

return -EIO;

}

r = sd_bus_open_system_container(&container_bus, args[1]);

if (r < 0) {

log_error_errno(-r, "Failed to get container bus: %m");

return r;

}

getty = strjoin("container-getty@", p, ".service", NULL);

if (!getty)

return log_oom();

if (unlockpt(master) < 0) {

log_error("Failed to unlock tty: %m");

return -errno;

}

r = sd_bus_call_method(container_bus,

"org.freedesktop.systemd1",

"/org/freedesktop/systemd1",

"org.freedesktop.systemd1.Manager",

"StartUnit",

&error, &reply3,

"ss", getty, "replace");

if (r < 0) {

log_error("Failed to start getty service: %s", bus_error_message(&error, r));

return r;

}

container_bus = sd_bus_unref(container_bus);

assert_se(sigemptyset(&mask) == 0);

sigset_add_many(&mask, SIGWINCH, SIGTERM, SIGINT, -1);

assert_se(sigprocmask(SIG_BLOCK, &mask, NULL) == 0);

log_info("Connected to container %s. Press ^] three times within 1s to exit session.", args[1]);

sd_event_add_signal(event, NULL, SIGINT, NULL, NULL);

sd_event_add_signal(event, NULL, SIGTERM, NULL, NULL);

r = pty_forward_new(event, master, &forward);

if (r < 0) {

log_error_errno(-r, "Failed to create PTY forwarder: %m");

return r;

}

r = sd_event_loop(event);

if (r < 0) {

log_error_errno(-r, "Failed to run event loop: %m");

return r;

}

forward = pty_forward_free(forward);

fputc('\n', stdout);

log_info("Connection to container %s terminated.", args[1]);

sd_event_get_exit_code(event, &ret);

return ret;

}

static void help(void) {

printf("%s [OPTIONS...] {COMMAND} ...\n\n"

"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"

" --no-pager Do not pipe output into a pager\n"

" --no-legend Do not show the headers and footers\n"

" -H --host=[USER@]HOST Operate on remote host\n"

" -M --machine=CONTAINER Operate on 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"

" show NAME... Show properties of one or more VMs/containers\n"

" login NAME Get a login prompt on a container\n"

" poweroff NAME... Power off one or more containers\n"

" reboot NAME... Reboot one or more containers\n"

" kill NAME... Send signal to processes of a VM/container\n"

" terminate NAME... Terminate one or more VMs/containers\n",

program_invocation_short_name);

}

static int parse_argv(int argc, char *argv[]) {

enum {

ARG_VERSION = 0x100,

ARG_NO_PAGER,

ARG_NO_LEGEND,

ARG_KILL_WHO,

};

static const struct option options[] = {

{ "help", no_argument, NULL, 'h' },

{ "version", no_argument, NULL, ARG_VERSION },

{ "property", required_argument, NULL, 'p' },

{ "all", no_argument, NULL, 'a' },

{ "full", no_argument, NULL, 'l' },

{ "no-pager", no_argument, NULL, ARG_NO_PAGER },

{ "no-legend", no_argument, NULL, ARG_NO_LEGEND },

{ "kill-who", required_argument, NULL, ARG_KILL_WHO },

{ "signal", required_argument, NULL, 's' },

{ "host", required_argument, NULL, 'H' },

{ "machine", required_argument, NULL, 'M' },

{}

};

int c, r;

assert(argc >= 0);

assert(argv);

while ((c = getopt_long(argc, argv, "hp:als:H:M:", options, NULL)) >= 0)

switch (c) {

case 'h':

help();

return 0;

case ARG_VERSION:

puts(PACKAGE_STRING);

puts(SYSTEMD_FEATURES);

return 0;

case 'p':

r = strv_extend(&arg_property, optarg);

if (r < 0)

return log_oom();

/* If the user asked for a particular

arg_all = true;

break;

case 'a':

arg_all = true;

break;

case 'l':

arg_full = true;

break;

case ARG_NO_PAGER:

arg_no_pager = true;

break;

case ARG_NO_LEGEND:

arg_legend = false;

break;

case ARG_KILL_WHO:

arg_kill_who = optarg;

break;

case 's':

arg_signal = signal_from_string_try_harder(optarg);

if (arg_signal < 0) {

log_error("Failed to parse signal string %s.", optarg);

return -EINVAL;

}

break;

case 'H':

arg_transport = BUS_TRANSPORT_REMOTE;

arg_host = optarg;

break;

case 'M':

arg_transport = BUS_TRANSPORT_CONTAINER;

arg_host = optarg;

break;

case '?':

return -EINVAL;

default:

assert_not_reached("Unhandled option");

}

return 1;

}

static int machinectl_main(sd_bus *bus, int argc, char *argv[]) {

static const struct {

const char* verb;

const enum {

MORE,

LESS,

EQUAL

} argc_cmp;

const int argc;

int (* const dispatch)(sd_bus *bus, char **args, unsigned n);

} verbs[] = {

{ "list", LESS, 1, list_machines },

{ "status", MORE, 2, show },

{ "show", MORE, 1, show },

{ "terminate", MORE, 2, terminate_machine },

{ "reboot", MORE, 2, reboot_machine },

{ "poweroff", MORE, 2, poweroff_machine },

{ "kill", MORE, 2, kill_machine },

{ "login", MORE, 2, login_machine },

};

int left;

unsigned i;

assert(argc >= 0);

assert(argv);

left = argc - optind;

if (left <= 0)

/* Special rule: no arguments means "list" */

i = 0;

else {

if (streq(argv[optind], "help")) {

help();

return 0;

}

for (i = 0; i < ELEMENTSOF(verbs); i++)

if (streq(argv[optind], verbs[i].verb))

break;

if (i >= ELEMENTSOF(verbs)) {

log_error("Unknown operation %s", argv[optind]);

return -EINVAL;

}

}

switch (verbs[i].argc_cmp) {

case EQUAL:

if (left != verbs[i].argc) {

log_error("Invalid number of arguments.");

return -EINVAL;

}

break;

case MORE:

if (left < verbs[i].argc) {

log_error("Too few arguments.");

return -EINVAL;

}

break;

case LESS:

if (left > verbs[i].argc) {

log_error("Too many arguments.");

return -EINVAL;

}

break;

default:

assert_not_reached("Unknown comparison operator.");

}

return verbs[i].dispatch(bus, argv + optind, left);

}

int main(int argc, char*argv[]) {

_cleanup_bus_close_unref_ sd_bus *bus = NULL;

int r;

setlocale(LC_ALL, "");

log_parse_environment();

log_open();

r = parse_argv(argc, argv);

if (r <= 0)

goto finish;

r = bus_open_transport(arg_transport, arg_host, false, &bus);

if (r < 0) {

log_error_errno(-r, "Failed to create bus connection: %m");

goto finish;

}

r = machinectl_main(bus, argc, argv);

finish:

pager_close();

strv_free(arg_property);

return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;

}