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/* SPDX-License-Identifier: LGPL-2.1+ */
#include <errno.h>
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "sd-daemon.h"
#include "alloc-util.h"
#include "env-util.h"
#include "format-util.h"
#include "log.h"
#include "parse-util.h"
#include "string-util.h"
#include "strv.h"
#include "user-util.h"
#include "util.h"
static bool arg_ready = false;
static pid_t arg_pid = 0;
static const char *arg_status = NULL;
static bool arg_booted = false;
static uid_t arg_uid = UID_INVALID;
static gid_t arg_gid = GID_INVALID;
static void help(void) {
printf("%s [OPTIONS...] [VARIABLE=VALUE...]\n\n"
"Notify the init system about service status updates.\n\n"
" -h --help Show this help\n"
" --version Show package version\n"
" --ready Inform the init system about service start-up completion\n"
" --pid[=PID] Set main PID of daemon\n"
" --uid=USER Set user to send from\n"
" --status=TEXT Set status text\n"
" --booted Check if the system was booted up with systemd\n",
program_invocation_short_name);
}
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_READY = 0x100,
ARG_VERSION,
ARG_PID,
ARG_STATUS,
ARG_BOOTED,
ARG_UID,
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, ARG_VERSION },
{ "ready", no_argument, NULL, ARG_READY },
{ "pid", optional_argument, NULL, ARG_PID },
{ "status", required_argument, NULL, ARG_STATUS },
{ "booted", no_argument, NULL, ARG_BOOTED },
{ "uid", required_argument, NULL, ARG_UID },
{}
};
int c, r;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) {
switch (c) {
case 'h':
help();
return 0;
case ARG_VERSION:
return version();
case ARG_READY:
arg_ready = true;
break;
case ARG_PID:
if (optarg) {
if (parse_pid(optarg, &arg_pid) < 0) {
log_error("Failed to parse PID %s.", optarg);
return -EINVAL;
}
} else
arg_pid = getppid();
break;
case ARG_STATUS:
arg_status = optarg;
break;
case ARG_BOOTED:
arg_booted = true;
break;
case ARG_UID: {
const char *u = optarg;
r = get_user_creds(&u, &arg_uid, &arg_gid, NULL, NULL);
if (r == -ESRCH) /* If the user doesn't exist, then accept it anyway as numeric */
r = parse_uid(u, &arg_uid);
if (r < 0)
return log_error_errno(r, "Can't resolve user %s: %m", optarg);
break;
}
case '?':
return -EINVAL;
default:
assert_not_reached("Unhandled option");
}
}
if (optind >= argc &&
!arg_ready &&
!arg_status &&
!arg_pid &&
!arg_booted) {
help();
return -EINVAL;
}
return 1;
}
int main(int argc, char* argv[]) {
_cleanup_free_ char *status = NULL, *cpid = NULL, *n = NULL;
_cleanup_strv_free_ char **final_env = NULL;
char* our_env[4];
unsigned i = 0;
int r;
log_parse_environment();
log_open();
r = parse_argv(argc, argv);
if (r <= 0)
goto finish;
if (arg_booted)
return sd_booted() <= 0;
if (arg_ready)
our_env[i++] = (char*) "READY=1";
if (arg_status) {
status = strappend("STATUS=", arg_status);
if (!status) {
r = log_oom();
goto finish;
}
our_env[i++] = status;
}
if (arg_pid > 0) {
if (asprintf(&cpid, "MAINPID="PID_FMT, arg_pid) < 0) {
r = log_oom();
goto finish;
}
our_env[i++] = cpid;
}
our_env[i++] = NULL;
final_env = strv_env_merge(2, our_env, argv + optind);
if (!final_env) {
r = log_oom();
goto finish;
}
if (strv_isempty(final_env)) {
r = 0;
goto finish;
}
n = strv_join(final_env, "\n");
if (!n) {
r = log_oom();
goto finish;
}
/* If this is requested change to the requested UID/GID. Note thta we only change the real UID here, and leave
the effective UID in effect (which is 0 for this to work). That's because we want the privileges to fake the
ucred data, and sd_pid_notify() uses the real UID for filling in ucred. */
if (arg_gid != GID_INVALID)
if (setregid(arg_gid, (gid_t) -1) < 0) {
r = log_error_errno(errno, "Failed to change GID: %m");
goto finish;
}
if (arg_uid != UID_INVALID)
if (setreuid(arg_uid, (uid_t) -1) < 0) {
r = log_error_errno(errno, "Failed to change UID: %m");
goto finish;
}
r = sd_pid_notify(arg_pid ? arg_pid : getppid(), false, n);
if (r < 0) {
log_error_errno(r, "Failed to notify init system: %m");
goto finish;
} else if (r == 0) {
log_error("No status data could be sent: $NOTIFY_SOCKET was not set");
r = -EOPNOTSUPP;
}
finish:
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}
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