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-rw-r--r--src/notify/notify.c473
1 files changed, 473 insertions, 0 deletions
diff --git a/src/notify/notify.c b/src/notify/notify.c
new file mode 100644
index 0000000..f63ec8b
--- /dev/null
+++ b/src/notify/notify.c
@@ -0,0 +1,473 @@
+/* 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 "build.h"
+#include "env-util.h"
+#include "fd-util.h"
+#include "fdset.h"
+#include "format-util.h"
+#include "log.h"
+#include "main-func.h"
+#include "parse-util.h"
+#include "pretty-print.h"
+#include "process-util.h"
+#include "string-util.h"
+#include "strv.h"
+#include "terminal-util.h"
+#include "time-util.h"
+#include "user-util.h"
+
+static bool arg_ready = false;
+static bool arg_reloading = false;
+static bool arg_stopping = 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 char **arg_env = NULL;
+static char **arg_exec = NULL;
+static FDSet *arg_fds = NULL;
+static char *arg_fdname = NULL;
+
+STATIC_DESTRUCTOR_REGISTER(arg_env, strv_freep);
+STATIC_DESTRUCTOR_REGISTER(arg_exec, strv_freep);
+STATIC_DESTRUCTOR_REGISTER(arg_fds, fdset_freep);
+STATIC_DESTRUCTOR_REGISTER(arg_fdname, freep);
+
+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"
+ "%s [OPTIONS...] --exec [VARIABLE=VALUE...] ; CMDLINE...\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 service manager about service start-up/reload\n"
+ " completion\n"
+ " --reloading Inform the service manager about configuration reloading\n"
+ " --stopping Inform the service manager about service shutdown\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"
+ " --exec Execute command line separated by ';' once done\n"
+ " --fd=FD Pass specified file descriptor with along with message\n"
+ " --fdname=NAME Name to assign to passed file descriptor(s)\n"
+ "\nSee the %s for details.\n",
+ program_invocation_short_name,
+ 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_RELOADING,
+ ARG_STOPPING,
+ ARG_VERSION,
+ ARG_PID,
+ ARG_STATUS,
+ ARG_BOOTED,
+ ARG_UID,
+ ARG_NO_BLOCK,
+ ARG_EXEC,
+ ARG_FD,
+ ARG_FDNAME,
+ };
+
+ static const struct option options[] = {
+ { "help", no_argument, NULL, 'h' },
+ { "version", no_argument, NULL, ARG_VERSION },
+ { "ready", no_argument, NULL, ARG_READY },
+ { "reloading", no_argument, NULL, ARG_RELOADING },
+ { "stopping", no_argument, NULL, ARG_STOPPING },
+ { "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 },
+ { "exec", no_argument, NULL, ARG_EXEC },
+ { "fd", required_argument, NULL, ARG_FD },
+ { "fdname", required_argument, NULL, ARG_FDNAME },
+ {}
+ };
+
+ _cleanup_fdset_free_ FDSet *passed = NULL;
+ bool do_exec = false;
+ int c, r, n_env;
+
+ 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_RELOADING:
+ arg_reloading = true;
+ break;
+
+ case ARG_STOPPING:
+ arg_stopping = 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_cached();
+ } else if (streq(optarg, "parent"))
+ arg_pid = getppid();
+ else if (streq(optarg, "self"))
+ arg_pid = getpid_cached();
+ 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 ARG_EXEC:
+ do_exec = true;
+ break;
+
+ case ARG_FD: {
+ _cleanup_close_ int owned_fd = -EBADF;
+ int fdnr;
+
+ fdnr = parse_fd(optarg);
+ if (fdnr < 0)
+ return log_error_errno(fdnr, "Failed to parse file descriptor: %s", optarg);
+
+ if (!passed) {
+ /* Take possession of all passed fds */
+ r = fdset_new_fill(/* filter_cloexec= */ 0, &passed);
+ if (r < 0)
+ return log_error_errno(r, "Failed to take possession of passed file descriptors: %m");
+ }
+
+ if (fdnr < 3) {
+ /* For stdin/stdout/stderr we want to keep the fd, too, hence make a copy */
+ owned_fd = fcntl(fdnr, F_DUPFD_CLOEXEC, 3);
+ if (owned_fd < 0)
+ return log_error_errno(errno, "Failed to duplicate file descriptor: %m");
+ } else {
+ /* Otherwise, move the fd over */
+ owned_fd = fdset_remove(passed, fdnr);
+ if (owned_fd < 0)
+ return log_error_errno(owned_fd, "Specified file descriptor '%i' not passed or specified more than once: %m", fdnr);
+ }
+
+ if (!arg_fds) {
+ arg_fds = fdset_new();
+ if (!arg_fds)
+ return log_oom();
+ }
+
+ r = fdset_consume(arg_fds, TAKE_FD(owned_fd));
+ if (r < 0)
+ return log_error_errno(r, "Failed to add file descriptor to set: %m");
+ break;
+ }
+
+ case ARG_FDNAME:
+ if (!fdname_is_valid(optarg))
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "File descriptor name invalid: %s", optarg);
+
+ if (free_and_strdup(&arg_fdname, optarg) < 0)
+ return log_oom();
+
+ break;
+
+ case '?':
+ return -EINVAL;
+
+ default:
+ assert_not_reached();
+ }
+ }
+
+ if (optind >= argc &&
+ !arg_ready &&
+ !arg_stopping &&
+ !arg_reloading &&
+ !arg_status &&
+ !arg_pid &&
+ !arg_booted &&
+ fdset_isempty(arg_fds)) {
+ help();
+ return -EINVAL;
+ }
+
+ if (arg_fdname && fdset_isempty(arg_fds))
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "No file descriptors passed, but --fdname= set, refusing.");
+
+ if (do_exec) {
+ int i;
+
+ for (i = optind; i < argc; i++)
+ if (streq(argv[i], ";"))
+ break;
+
+ if (i >= argc)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "If --exec is used argument list must contain ';' separator, refusing.");
+ if (i+1 == argc)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Empty command line specified after ';' separator, refusing");
+
+ arg_exec = strv_copy_n(argv + i + 1, argc - i - 1);
+ if (!arg_exec)
+ return log_oom();
+
+ n_env = i - optind;
+ } else
+ n_env = argc - optind;
+
+ if (n_env > 0) {
+ arg_env = strv_copy_n(argv + optind, n_env);
+ if (!arg_env)
+ return log_oom();
+ }
+
+ if (!fdset_isempty(passed))
+ log_warning("Warning: %u more file descriptors passed than referenced with --fd=.", fdset_size(passed));
+
+ return 1;
+}
+
+static int run(int argc, char* argv[]) {
+ _cleanup_free_ char *status = NULL, *cpid = NULL, *n = NULL, *monotonic_usec = NULL, *fdn = NULL;
+ _cleanup_strv_free_ char **final_env = NULL;
+ char* our_env[9];
+ size_t 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_reloading) {
+ our_env[i++] = (char*) "RELOADING=1";
+
+ if (asprintf(&monotonic_usec, "MONOTONIC_USEC=" USEC_FMT, now(CLOCK_MONOTONIC)) < 0)
+ return log_oom();
+
+ our_env[i++] = monotonic_usec;
+ }
+
+ if (arg_ready)
+ our_env[i++] = (char*) "READY=1";
+
+ if (arg_stopping)
+ our_env[i++] = (char*) "STOPPING=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;
+ }
+
+ if (!fdset_isempty(arg_fds)) {
+ our_env[i++] = (char*) "FDSTORE=1";
+
+ if (arg_fdname) {
+ fdn = strjoin("FDNAME=", arg_fdname);
+ if (!fdn)
+ return log_oom();
+
+ our_env[i++] = fdn;
+ }
+ }
+
+ our_env[i++] = NULL;
+
+ final_env = strv_env_merge(our_env, arg_env);
+ 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;
+ }
+
+ if (fdset_isempty(arg_fds))
+ r = sd_pid_notify(source_pid, /* unset_environment= */ false, n);
+ else {
+ _cleanup_free_ int *a = NULL;
+ int k;
+
+ k = fdset_to_array(arg_fds, &a);
+ if (k < 0)
+ return log_error_errno(k, "Failed to convert file descriptor set to array: %m");
+
+ r = sd_pid_notify_with_fds(source_pid, /* unset_environment= */ false, n, a, k);
+
+ }
+ 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");
+
+ arg_fds = fdset_free(arg_fds); /* Close before we execute anything */
+
+ if (!arg_no_block) {
+ r = sd_pid_notify_barrier(source_pid, /* unset_environment= */ false, 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");
+ }
+
+ if (arg_exec) {
+ _cleanup_free_ char *cmdline = NULL;
+
+ execvp(arg_exec[0], arg_exec);
+
+ cmdline = strv_join(arg_exec, " ");
+ if (!cmdline)
+ return log_oom();
+
+ return log_error_errno(errno, "Failed to execute command line: %s", cmdline);
+ }
+
+ /* The DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE() boilerplate will send the exit status via
+ * sd_notify(). Which is normally fine, but very confusing in systemd-notify, whose purpose is to
+ * send user-controllable notification messages, and not implicit ones. Let's turn if off, by
+ * unsetting the $NOTIFY_SOCKET environment variable. */
+ (void) unsetenv("NOTIFY_SOCKET");
+ return 0;
+}
+
+DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-30 10:05:54 +0000