9dcd43b149
Prompted by the discussions on #15547.
263 lines
8.5 KiB
C
263 lines
8.5 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <errno.h>
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#include <getopt.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "sd-daemon.h"
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#include "alloc-util.h"
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#include "env-util.h"
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#include "format-util.h"
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#include "log.h"
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#include "main-func.h"
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#include "parse-util.h"
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#include "pretty-print.h"
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#include "string-util.h"
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#include "strv.h"
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#include "terminal-util.h"
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#include "user-util.h"
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#include "util.h"
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static bool arg_ready = false;
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static pid_t arg_pid = 0;
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static const char *arg_status = NULL;
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static bool arg_booted = false;
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static uid_t arg_uid = UID_INVALID;
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static gid_t arg_gid = GID_INVALID;
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static int help(void) {
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_cleanup_free_ char *link = NULL;
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int r;
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r = terminal_urlify_man("systemd-notify", "1", &link);
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if (r < 0)
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return log_oom();
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printf("%s [OPTIONS...] [VARIABLE=VALUE...]\n"
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"\n%sNotify the init system about service status updates.%s\n\n"
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" -h --help Show this help\n"
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" --version Show package version\n"
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" --ready Inform the init system about service start-up completion\n"
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" --pid[=PID] Set main PID of daemon\n"
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" --uid=USER Set user to send from\n"
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" --status=TEXT Set status text\n"
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" --booted Check if the system was booted up with systemd\n"
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"\nSee the %s for details.\n"
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, program_invocation_short_name
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, ansi_highlight(), ansi_normal()
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, link
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);
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return 0;
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}
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static pid_t manager_pid(void) {
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const char *e;
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pid_t pid;
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int r;
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/* If we run as a service managed by systemd --user the $MANAGERPID environment variable points to
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* the service manager's PID. */
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e = getenv("MANAGERPID");
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if (!e)
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return 0;
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r = parse_pid(e, &pid);
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if (r < 0) {
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log_warning_errno(r, "$MANAGERPID is set to an invalid PID, ignoring: %s", e);
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return 0;
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}
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return pid;
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}
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static int parse_argv(int argc, char *argv[]) {
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enum {
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ARG_READY = 0x100,
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ARG_VERSION,
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ARG_PID,
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ARG_STATUS,
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ARG_BOOTED,
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ARG_UID,
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};
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static const struct option options[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "version", no_argument, NULL, ARG_VERSION },
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{ "ready", no_argument, NULL, ARG_READY },
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{ "pid", optional_argument, NULL, ARG_PID },
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{ "status", required_argument, NULL, ARG_STATUS },
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{ "booted", no_argument, NULL, ARG_BOOTED },
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{ "uid", required_argument, NULL, ARG_UID },
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{}
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};
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int c, r;
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assert(argc >= 0);
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assert(argv);
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while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) {
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switch (c) {
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case 'h':
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return help();
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case ARG_VERSION:
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return version();
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case ARG_READY:
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arg_ready = true;
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break;
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case ARG_PID:
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if (isempty(optarg) || streq(optarg, "auto")) {
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arg_pid = getppid();
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if (arg_pid <= 1 ||
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arg_pid == manager_pid()) /* Don't send from PID 1 or the service
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* manager's PID (which might be distinct from
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* 1, if we are a --user instance), that'd just
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* be confusing for the service manager */
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arg_pid = getpid();
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} else if (streq(optarg, "parent"))
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arg_pid = getppid();
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else if (streq(optarg, "self"))
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arg_pid = getpid();
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else {
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r = parse_pid(optarg, &arg_pid);
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if (r < 0)
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return log_error_errno(r, "Failed to parse PID %s.", optarg);
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}
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break;
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case ARG_STATUS:
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arg_status = optarg;
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break;
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case ARG_BOOTED:
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arg_booted = true;
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break;
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case ARG_UID: {
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const char *u = optarg;
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r = get_user_creds(&u, &arg_uid, &arg_gid, NULL, NULL, 0);
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if (r == -ESRCH) /* If the user doesn't exist, then accept it anyway as numeric */
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r = parse_uid(u, &arg_uid);
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if (r < 0)
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return log_error_errno(r, "Can't resolve user %s: %m", optarg);
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break;
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}
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case '?':
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return -EINVAL;
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default:
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assert_not_reached("Unhandled option");
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}
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}
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if (optind >= argc &&
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!arg_ready &&
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!arg_status &&
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!arg_pid &&
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!arg_booted) {
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help();
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return -EINVAL;
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}
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return 1;
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}
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static int run(int argc, char* argv[]) {
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_cleanup_free_ char *status = NULL, *cpid = NULL, *n = NULL;
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_cleanup_strv_free_ char **final_env = NULL;
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char* our_env[4];
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unsigned i = 0;
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pid_t source_pid;
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int r;
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log_show_color(true);
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log_parse_environment();
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log_open();
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r = parse_argv(argc, argv);
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if (r <= 0)
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return r;
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if (arg_booted)
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return sd_booted() <= 0;
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if (arg_ready)
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our_env[i++] = (char*) "READY=1";
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if (arg_status) {
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status = strjoin("STATUS=", arg_status);
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if (!status)
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return log_oom();
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our_env[i++] = status;
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}
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if (arg_pid > 0) {
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if (asprintf(&cpid, "MAINPID="PID_FMT, arg_pid) < 0)
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return log_oom();
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our_env[i++] = cpid;
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}
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our_env[i++] = NULL;
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final_env = strv_env_merge(2, our_env, argv + optind);
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if (!final_env)
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return log_oom();
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if (strv_isempty(final_env))
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return 0;
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n = strv_join(final_env, "\n");
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if (!n)
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return log_oom();
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/* If this is requested change to the requested UID/GID. Note that we only change the real UID here, and leave
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the effective UID in effect (which is 0 for this to work). That's because we want the privileges to fake the
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ucred data, and sd_pid_notify() uses the real UID for filling in ucred. */
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if (arg_gid != GID_INVALID &&
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setregid(arg_gid, (gid_t) -1) < 0)
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return log_error_errno(errno, "Failed to change GID: %m");
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if (arg_uid != UID_INVALID &&
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setreuid(arg_uid, (uid_t) -1) < 0)
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return log_error_errno(errno, "Failed to change UID: %m");
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if (arg_pid > 0)
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source_pid = arg_pid;
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else {
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/* Pretend the message originates from our parent, given that we are typically called from a
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* shell script, i.e. we are not the main process of a service but only a child of it. */
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source_pid = getppid();
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if (source_pid <= 1 ||
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source_pid == manager_pid()) /* safety check: don't claim we'd send anything from PID 1
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* or the service manager itself */
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source_pid = 0;
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}
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r = sd_pid_notify(source_pid, false, n);
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if (r < 0)
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return log_error_errno(r, "Failed to notify init system: %m");
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if (r == 0)
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return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
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"No status data could be sent: $NOTIFY_SOCKET was not set");
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return 0;
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}
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DEFINE_MAIN_FUNCTION(run);
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