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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#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 "main-func.h"
#include "parse-util.h"
#include "pretty-print.h"
#include "string-util.h"
#include "strv.h"
#include "terminal-util.h"
#include "time-util.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 bool arg_no_block = false;
static int help(void) {
_cleanup_free_ char *link = NULL;
int r;
r = terminal_urlify_man("systemd-notify", "1", &link);
if (r < 0)
return log_oom();
printf("%s [OPTIONS...] [VARIABLE=VALUE...]\n"
"\n%sNotify the init system about service status updates.%s\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"
" --no-block Do not wait until operation finished\n"
"\nSee the %s for details.\n",
program_invocation_short_name,
ansi_highlight(),
ansi_normal(),
link);
return 0;
}
static pid_t manager_pid(void) {
const char *e;
pid_t pid;
int r;
/* If we run as a service managed by systemd --user the $MANAGERPID environment variable points to
* the service manager's PID. */
e = getenv("MANAGERPID");
if (!e)
return 0;
r = parse_pid(e, &pid);
if (r < 0) {
log_warning_errno(r, "$MANAGERPID is set to an invalid PID, ignoring: %s", e);
return 0;
}
return pid;
}
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_READY = 0x100,
ARG_VERSION,
ARG_PID,
ARG_STATUS,
ARG_BOOTED,
ARG_UID,
ARG_NO_BLOCK
};
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 },
{ "no-block", no_argument, NULL, ARG_NO_BLOCK },
{}
};
int c, r;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) {
switch (c) {
case 'h':
return help();
case ARG_VERSION:
return version();
case ARG_READY:
arg_ready = true;
break;
case ARG_PID:
if (isempty(optarg) || streq(optarg, "auto")) {
arg_pid = getppid();
if (arg_pid <= 1 ||
arg_pid == manager_pid()) /* Don't send from PID 1 or the service
* manager's PID (which might be distinct from
* 1, if we are a --user instance), that'd just
* be confusing for the service manager */
arg_pid = getpid();
} else if (streq(optarg, "parent"))
arg_pid = getppid();
else if (streq(optarg, "self"))
arg_pid = getpid();
else {
r = parse_pid(optarg, &arg_pid);
if (r < 0)
return log_error_errno(r, "Failed to parse PID %s.", optarg);
}
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, 0);
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 ARG_NO_BLOCK:
arg_no_block = true;
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;
}
static int run(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;
pid_t source_pid;
int r;
log_show_color(true);
log_parse_environment();
log_open();
r = parse_argv(argc, argv);
if (r <= 0)
return r;
if (arg_booted) {
r = sd_booted();
if (r < 0)
log_debug_errno(r, "Failed to determine whether we are booted with systemd, assuming we aren't: %m");
else
log_debug("The system %s booted with systemd.", r ? "was" : "was not");
return r <= 0;
}
if (arg_ready)
our_env[i++] = (char*) "READY=1";
if (arg_status) {
status = strjoin("STATUS=", arg_status);
if (!status)
return log_oom();
our_env[i++] = status;
}
if (arg_pid > 0) {
if (asprintf(&cpid, "MAINPID="PID_FMT, arg_pid) < 0)
return log_oom();
our_env[i++] = cpid;
}
our_env[i++] = NULL;
final_env = strv_env_merge(2, our_env, argv + optind);
if (!final_env)
return log_oom();
if (strv_isempty(final_env))
return 0;
n = strv_join(final_env, "\n");
if (!n)
return log_oom();
/* If this is requested change to the requested UID/GID. Note that 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 &&
setregid(arg_gid, GID_INVALID) < 0)
return log_error_errno(errno, "Failed to change GID: %m");
if (arg_uid != UID_INVALID &&
setreuid(arg_uid, UID_INVALID) < 0)
return log_error_errno(errno, "Failed to change UID: %m");
if (arg_pid > 0)
source_pid = arg_pid;
else {
/* Pretend the message originates from our parent, given that we are typically called from a
* shell script, i.e. we are not the main process of a service but only a child of it. */
source_pid = getppid();
if (source_pid <= 1 ||
source_pid == manager_pid()) /* safety check: don't claim we'd send anything from PID 1
* or the service manager itself */
source_pid = 0;
}
r = sd_pid_notify(source_pid, false, n);
if (r < 0)
return log_error_errno(r, "Failed to notify init system: %m");
if (r == 0)
return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
"No status data could be sent: $NOTIFY_SOCKET was not set");
if (!arg_no_block) {
r = sd_notify_barrier(0, 5 * USEC_PER_SEC);
if (r < 0)
return log_error_errno(r, "Failed to invoke barrier: %m");
if (r == 0)
return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
"No status data could be sent: $NOTIFY_SOCKET was not set");
}
return 0;
}
DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE (run);
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