#include <stdio.h>

#include <getopt.h>

#include "sd-bus.h"

#include "bus-util.h"

#include "strv.h"

#include "build.h"

#include "unit-name.h"

#include "env-util.h"

#include "path-util.h"

#include "bus-error.h"

static bool arg_scope = false;

static bool arg_remain_after_exit = false;

static const char *arg_unit = NULL;

static const char *arg_description = NULL;

static const char *arg_slice = NULL;

static bool arg_send_sighup = false;

static BusTransport arg_transport = BUS_TRANSPORT_LOCAL;

static const char *arg_host = NULL;

static bool arg_user = false;

static const char *arg_service_type = NULL;

static const char *arg_exec_user = NULL;

static const char *arg_exec_group = NULL;

static int arg_nice = 0;

static bool arg_nice_set = false;

static char **arg_environment = NULL;

static char **arg_property = NULL;

static void help(void) {

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

"Run the specified command in a transient scope or service unit.\n\n"

" -h --help Show this help\n"

" --version Show package version\n"

" --user Run as user unit\n"

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

" -M --machine=CONTAINER Operate on local container\n"

" --scope Run this as scope rather than service\n"

" --unit=UNIT Run under the specified unit name\n"

" -p --property=NAME=VALUE Set unit property\n"

" --description=TEXT Description for unit\n"

" --slice=SLICE Run in the specified slice\n"

" -r --remain-after-exit Leave service around until explicitly stopped\n"

" --send-sighup Send SIGHUP when terminating\n"

" --service-type=TYPE Service type\n"

" --uid=USER Run as system user\n"

" --gid=GROUP Run as system group\n"

" --nice=NICE Nice level\n"

" --setenv=NAME=VALUE Set environment\n",

program_invocation_short_name);

}

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

enum {

ARG_VERSION = 0x100,

ARG_USER,

ARG_SYSTEM,

ARG_SCOPE,

ARG_UNIT,

ARG_DESCRIPTION,

ARG_SLICE,

ARG_SEND_SIGHUP,

ARG_EXEC_USER,

ARG_EXEC_GROUP,

ARG_SERVICE_TYPE,

ARG_NICE,

ARG_SETENV

};

static const struct option options[] = {

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

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

{ "user", no_argument, NULL, ARG_USER },

{ "system", no_argument, NULL, ARG_SYSTEM },

{ "scope", no_argument, NULL, ARG_SCOPE },

{ "unit", required_argument, NULL, ARG_UNIT },

{ "description", required_argument, NULL, ARG_DESCRIPTION },

{ "slice", required_argument, NULL, ARG_SLICE },

{ "remain-after-exit", no_argument, NULL, 'r' },

{ "send-sighup", no_argument, NULL, ARG_SEND_SIGHUP },

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

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

{ "service-type", required_argument, NULL, ARG_SERVICE_TYPE },

{ "uid", required_argument, NULL, ARG_EXEC_USER },

{ "gid", required_argument, NULL, ARG_EXEC_GROUP },

{ "nice", required_argument, NULL, ARG_NICE },

{ "setenv", required_argument, NULL, ARG_SETENV },

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

{},

};

int r, c;

assert(argc >= 0);

assert(argv);

while ((c = getopt_long(argc, argv, "+hrH:M:p:", options, NULL)) >= 0)

switch (c) {

case 'h':

help();

return 0;

case ARG_VERSION:

puts(PACKAGE_STRING);

puts(SYSTEMD_FEATURES);

return 0;

case ARG_USER:

arg_user = true;

break;

case ARG_SYSTEM:

arg_user = false;

break;

case ARG_SCOPE:

arg_scope = true;

break;

case ARG_UNIT:

arg_unit = optarg;

break;

case ARG_DESCRIPTION:

arg_description = optarg;

break;

case ARG_SLICE:

arg_slice = optarg;

break;

case ARG_SEND_SIGHUP:

arg_send_sighup = true;

break;

case 'r':

arg_remain_after_exit = true;

break;

case 'H':

arg_transport = BUS_TRANSPORT_REMOTE;

arg_host = optarg;

break;

case 'M':

arg_transport = BUS_TRANSPORT_CONTAINER;

arg_host = optarg;

break;

case ARG_SERVICE_TYPE:

arg_service_type = optarg;

break;

case ARG_EXEC_USER:

arg_exec_user = optarg;

break;

case ARG_EXEC_GROUP:

arg_exec_group = optarg;

break;

case ARG_NICE:

r = safe_atoi(optarg, &arg_nice);

if (r < 0 || arg_nice < PRIO_MIN || arg_nice >= PRIO_MAX) {

log_error("Failed to parse nice value");

return -EINVAL;

}

arg_nice_set = true;

break;

case ARG_SETENV:

if (strv_extend(&arg_environment, optarg) < 0)

return log_oom();

break;

case 'p':

if (strv_extend(&arg_property, optarg) < 0)

return log_oom();

break;

case '?':

return -EINVAL;

default:

assert_not_reached("Unhandled option");

}

if (optind >= argc) {

log_error("Command line to execute required.");

return -EINVAL;

}

if (arg_user && arg_transport != BUS_TRANSPORT_LOCAL) {

log_error("Execution in user context is not supported on non-local systems.");

return -EINVAL;

}

if (arg_scope && arg_transport != BUS_TRANSPORT_LOCAL) {

log_error("Scope execution is not supported on non-local systems.");

return -EINVAL;

}

if (arg_scope && (arg_remain_after_exit || arg_service_type)) {

log_error("--remain-after-exit and --service-type= are not supported in --scope mode.");

return -EINVAL;

}

return 1;

}

static int message_start_transient_unit_new(sd_bus *bus, const char *name, sd_bus_message **ret) {

_cleanup_bus_message_unref_ sd_bus_message *m = NULL;

char **i;

int r;

assert(bus);

assert(name);

assert(ret);

r = sd_bus_message_new_method_call(

bus,

&m,

"org.freedesktop.systemd1",

"/org/freedesktop/systemd1",

"org.freedesktop.systemd1.Manager",

"StartTransientUnit");

if (r < 0)

return r;

r = sd_bus_message_append(m, "ss", name, "fail");

if (r < 0)

return r;

r = sd_bus_message_open_container(m, 'a', "(sv)");

if (r < 0)

return r;

STRV_FOREACH(i, arg_property) {

r = sd_bus_message_open_container(m, 'r', "sv");

if (r < 0)

return 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 r;

}

r = sd_bus_message_append(m, "(sv)", "Description", "s", arg_description);

if (r < 0)

return r;

if (!isempty(arg_slice)) {

_cleanup_free_ char *slice;

slice = unit_name_mangle_with_suffix(arg_slice, MANGLE_NOGLOB, ".slice");

if (!slice)

return -ENOMEM;

r = sd_bus_message_append(m, "(sv)", "Slice", "s", slice);

if (r < 0)

return r;

}

if (arg_send_sighup) {

r = sd_bus_message_append(m, "(sv)", "SendSIGHUP", "b", arg_send_sighup);

if (r < 0)

return r;

}

*ret = m;

m = NULL;

return 0;

}

static int message_start_transient_unit_send(sd_bus *bus, sd_bus_message *m, sd_bus_error *error, sd_bus_message **reply) {

int r;

assert(bus);

assert(m);

r = sd_bus_message_close_container(m);

if (r < 0)

return r;

r = sd_bus_message_append(m, "a(sa(sv))", 0);

if (r < 0)

return r;

return sd_bus_call(bus, m, 0, error, reply);

}

static int start_transient_service(

sd_bus *bus,

char **argv,

sd_bus_error *error) {

_cleanup_bus_message_unref_ sd_bus_message *m = NULL;

_cleanup_free_ char *name = NULL;

int r;

if (arg_unit) {

name = unit_name_mangle_with_suffix(arg_unit, MANGLE_NOGLOB, ".service");

if (!name)

return log_oom();

} else if (asprintf(&name, "run-"PID_FMT".service", getpid()) < 0)

return log_oom();

r = message_start_transient_unit_new(bus, name, &m);

if (r < 0)

return bus_log_create_error(r);

if (arg_remain_after_exit) {

r = sd_bus_message_append(m, "(sv)", "RemainAfterExit", "b", arg_remain_after_exit);

if (r < 0)

return bus_log_create_error(r);

}

if (arg_service_type) {

r = sd_bus_message_append(m, "(sv)", "Type", "s", arg_service_type);

if (r < 0)

return bus_log_create_error(r);

}

if (arg_exec_user) {

r = sd_bus_message_append(m, "(sv)", "User", "s", arg_exec_user);

if (r < 0)

return bus_log_create_error(r);

}

if (arg_exec_group) {

r = sd_bus_message_append(m, "(sv)", "Group", "s", arg_exec_group);

if (r < 0)

return bus_log_create_error(r);

}

if (arg_nice_set) {

r = sd_bus_message_append(m, "(sv)", "Nice", "i", arg_nice);

if (r < 0)

return bus_log_create_error(r);

}

if (!strv_isempty(arg_environment)) {

r = sd_bus_message_open_container(m, 'r', "sv");

if (r < 0)

return bus_log_create_error(r);

r = sd_bus_message_append(m, "s", "Environment");

if (r < 0)

return bus_log_create_error(r);

r = sd_bus_message_open_container(m, 'v', "as");

if (r < 0)

return bus_log_create_error(r);

r = sd_bus_message_append_strv(m, arg_environment);

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_message_close_container(m);

if (r < 0)

return bus_log_create_error(r);

}

r = sd_bus_message_open_container(m, 'r', "sv");

if (r < 0)

return bus_log_create_error(r);

r = sd_bus_message_append(m, "s", "ExecStart");

if (r < 0)

return bus_log_create_error(r);

r = sd_bus_message_open_container(m, 'v', "a(sasb)");

if (r < 0)

return bus_log_create_error(r);

r = sd_bus_message_open_container(m, 'a', "(sasb)");

if (r < 0)

return bus_log_create_error(r);

r = sd_bus_message_open_container(m, 'r', "sasb");

if (r < 0)

return bus_log_create_error(r);

r = sd_bus_message_append(m, "s", argv[0]);

if (r < 0)

return bus_log_create_error(r);

r = sd_bus_message_append_strv(m, argv);

if (r < 0)

return bus_log_create_error(r);

r = sd_bus_message_append(m, "b", false);

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_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_message_close_container(m);

if (r < 0)

return bus_log_create_error(r);

r = message_start_transient_unit_send(bus, m, error, NULL);

if (r < 0)

return bus_log_create_error(r);

log_info("Running as unit %s.", name);

return 0;

}

static int start_transient_scope(

sd_bus *bus,

char **argv,

sd_bus_error *error) {

_cleanup_bus_message_unref_ sd_bus_message *m = NULL;

_cleanup_free_ char *name = NULL;

_cleanup_strv_free_ char **env = NULL, **user_env = NULL;

int r;

assert(bus);

if (arg_unit) {

name = unit_name_mangle_with_suffix(arg_unit, MANGLE_NOGLOB, ".scope");

if (!name)

return log_oom();

} else if (asprintf(&name, "run-"PID_FMT".scope", getpid()) < 0)

return log_oom();

r = message_start_transient_unit_new(bus, name, &m);

if (r < 0)

return bus_log_create_error(r);

r = sd_bus_message_append(m, "(sv)", "PIDs", "au", 1, (uint32_t) getpid());

if (r < 0)

return bus_log_create_error(r);

r = message_start_transient_unit_send(bus, m, error, NULL);

if (r < 0)

return bus_log_create_error(r);

if (arg_nice_set) {

if (setpriority(PRIO_PROCESS, 0, arg_nice) < 0) {

log_error_errno(errno, "Failed to set nice level: %m");

return -errno;

}

}

if (arg_exec_group) {

gid_t gid;

r = get_group_creds(&arg_exec_group, &gid);

if (r < 0)

return log_error_errno(r, "Failed to resolve group %s: %m", arg_exec_group);

if (setresgid(gid, gid, gid) < 0) {

log_error_errno(errno, "Failed to change GID to " GID_FMT ": %m", gid);

return -errno;

}

}

if (arg_exec_user) {

const char *home, *shell;

uid_t uid;

gid_t gid;

r = get_user_creds(&arg_exec_user, &uid, &gid, &home, &shell);

if (r < 0)

return log_error_errno(r, "Failed to resolve user %s: %m", arg_exec_user);

r = strv_extendf(&user_env, "HOME=%s", home);

if (r < 0)

return log_oom();

r = strv_extendf(&user_env, "SHELL=%s", shell);

if (r < 0)

return log_oom();

r = strv_extendf(&user_env, "USER=%s", arg_exec_user);

if (r < 0)

return log_oom();

r = strv_extendf(&user_env, "LOGNAME=%s", arg_exec_user);

if (r < 0)

return log_oom();

if (!arg_exec_group) {

if (setresgid(gid, gid, gid) < 0) {

log_error_errno(errno, "Failed to change GID to " GID_FMT ": %m", gid);

return -errno;

}

}

if (setresuid(uid, uid, uid) < 0) {

log_error_errno(errno, "Failed to change UID to " UID_FMT ": %m", uid);

return -errno;

}

}

env = strv_env_merge(3, environ, user_env, arg_environment);

if (!env)

return log_oom();

log_info("Running as unit %s.", name);

execvpe(argv[0], argv, env);

log_error_errno(errno, "Failed to execute: %m");

return -errno;

}

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

_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;

_cleanup_bus_close_unref_ sd_bus *bus = NULL;

_cleanup_free_ char *description = NULL, *command = NULL;

int r;

log_parse_environment();

log_open();

r = parse_argv(argc, argv);

if (r <= 0)

goto finish;

r = find_binary(argv[optind], arg_transport == BUS_TRANSPORT_LOCAL, &command);

if (r < 0) {

log_error_errno(r, "Failed to find executable %s%s: %m",

argv[optind],

arg_transport == BUS_TRANSPORT_LOCAL ? "" : " on local system");

goto finish;

}

argv[optind] = command;

if (!arg_description) {

description = strv_join(argv + optind, " ");

if (!description) {

r = log_oom();

goto finish;

}

arg_description = description;

}

r = bus_open_transport_systemd(arg_transport, arg_host, arg_user, &bus);

if (r < 0) {

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

goto finish;

}

if (arg_scope)

r = start_transient_scope(bus, argv + optind, &error);

else

r = start_transient_service(bus, argv + optind, &error);

finish:

strv_free(arg_environment);

strv_free(arg_property);

return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;

}