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-rw-r--r--src/udev/udevd.c408
1 files changed, 408 insertions, 0 deletions
diff --git a/src/udev/udevd.c b/src/udev/udevd.c
new file mode 100644
index 0000000..2ed4282
--- /dev/null
+++ b/src/udev/udevd.c
@@ -0,0 +1,408 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright © 2004 Chris Friesen <chris_friesen@sympatico.ca>
+ * Copyright © 2009 Canonical Ltd.
+ * Copyright © 2009 Scott James Remnant <scott@netsplit.com>
+ */
+
+#include <getopt.h>
+#include <unistd.h>
+
+#include "sd-daemon.h"
+
+#include "env-file.h"
+#include "errno-util.h"
+#include "fd-util.h"
+#include "mkdir.h"
+#include "parse-util.h"
+#include "pretty-print.h"
+#include "proc-cmdline.h"
+#include "process-util.h"
+#include "rlimit-util.h"
+#include "selinux-util.h"
+#include "signal-util.h"
+#include "syslog-util.h"
+#include "udev-manager.h"
+#include "udev-util.h"
+#include "udevd.h"
+#include "version.h"
+
+static bool arg_debug = false;
+static int arg_daemonize = false;
+
+static int listen_fds(int *ret_ctrl, int *ret_netlink) {
+ int ctrl_fd = -EBADF, netlink_fd = -EBADF;
+ int fd, n;
+
+ assert(ret_ctrl);
+ assert(ret_netlink);
+
+ n = sd_listen_fds(true);
+ if (n < 0)
+ return n;
+
+ for (fd = SD_LISTEN_FDS_START; fd < n + SD_LISTEN_FDS_START; fd++) {
+ if (sd_is_socket(fd, AF_UNIX, SOCK_SEQPACKET, -1) > 0) {
+ if (ctrl_fd >= 0)
+ return -EINVAL;
+ ctrl_fd = fd;
+ continue;
+ }
+
+ if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1) > 0) {
+ if (netlink_fd >= 0)
+ return -EINVAL;
+ netlink_fd = fd;
+ continue;
+ }
+
+ return -EINVAL;
+ }
+
+ *ret_ctrl = ctrl_fd;
+ *ret_netlink = netlink_fd;
+
+ return 0;
+}
+
+static int manager_parse_udev_config(Manager *manager) {
+ _cleanup_free_ char *log_val = NULL, *children_max = NULL, *exec_delay = NULL,
+ *event_timeout = NULL, *resolve_names = NULL, *timeout_signal = NULL;
+ int r;
+
+ assert(manager);
+
+ r = parse_env_file(NULL, "/etc/udev/udev.conf",
+ "udev_log", &log_val,
+ "children_max", &children_max,
+ "exec_delay", &exec_delay,
+ "event_timeout", &event_timeout,
+ "resolve_names", &resolve_names,
+ "timeout_signal", &timeout_signal);
+ if (r == -ENOENT)
+ return 0;
+ if (r < 0)
+ return r;
+
+ r = udev_set_max_log_level(log_val);
+ if (r < 0)
+ log_syntax(NULL, LOG_WARNING, "/etc/udev/udev.conf", 0, r,
+ "Failed to set udev log level '%s', ignoring: %m", log_val);
+
+ if (children_max) {
+ r = safe_atou(children_max, &manager->children_max);
+ if (r < 0)
+ log_syntax(NULL, LOG_WARNING, "/etc/udev/udev.conf", 0, r,
+ "Failed to parse children_max=%s, ignoring: %m", children_max);
+ }
+
+ if (exec_delay) {
+ r = parse_sec(exec_delay, &manager->exec_delay_usec);
+ if (r < 0)
+ log_syntax(NULL, LOG_WARNING, "/etc/udev/udev.conf", 0, r,
+ "Failed to parse exec_delay=%s, ignoring: %m", exec_delay);
+ }
+
+ if (event_timeout) {
+ r = parse_sec(event_timeout, &manager->timeout_usec);
+ if (r < 0)
+ log_syntax(NULL, LOG_WARNING, "/etc/udev/udev.conf", 0, r,
+ "Failed to parse event_timeout=%s, ignoring: %m", event_timeout);
+ }
+
+ if (resolve_names) {
+ ResolveNameTiming t;
+
+ t = resolve_name_timing_from_string(resolve_names);
+ if (t < 0)
+ log_syntax(NULL, LOG_WARNING, "/etc/udev/udev.conf", 0, r,
+ "Failed to parse resolve_names=%s, ignoring.", resolve_names);
+ else
+ manager->resolve_name_timing = t;
+ }
+
+ if (timeout_signal) {
+ r = signal_from_string(timeout_signal);
+ if (r < 0)
+ log_syntax(NULL, LOG_WARNING, "/etc/udev/udev.conf", 0, r,
+ "Failed to parse timeout_signal=%s, ignoring: %m", timeout_signal);
+ else
+ manager->timeout_signal = r;
+ }
+
+ return 0;
+}
+
+/*
+ * read the kernel command line, in case we need to get into debug mode
+ * udev.log_level=<level> syslog priority
+ * udev.children_max=<number of workers> events are fully serialized if set to 1
+ * udev.exec_delay=<number of seconds> delay execution of every executed program
+ * udev.event_timeout=<number of seconds> seconds to wait before terminating an event
+ * udev.blockdev_read_only<=bool> mark all block devices read-only when they appear
+ */
+static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
+ Manager *manager = ASSERT_PTR(data);
+ int r;
+
+ assert(key);
+
+ if (proc_cmdline_key_streq(key, "udev.log_level") ||
+ proc_cmdline_key_streq(key, "udev.log_priority")) { /* kept for backward compatibility */
+
+ if (proc_cmdline_value_missing(key, value))
+ return 0;
+
+ r = log_level_from_string(value);
+ if (r >= 0)
+ log_set_max_level(r);
+
+ } else if (proc_cmdline_key_streq(key, "udev.event_timeout")) {
+
+ if (proc_cmdline_value_missing(key, value))
+ return 0;
+
+ r = parse_sec(value, &manager->timeout_usec);
+
+ } else if (proc_cmdline_key_streq(key, "udev.children_max")) {
+
+ if (proc_cmdline_value_missing(key, value))
+ return 0;
+
+ r = safe_atou(value, &manager->children_max);
+
+ } else if (proc_cmdline_key_streq(key, "udev.exec_delay")) {
+
+ if (proc_cmdline_value_missing(key, value))
+ return 0;
+
+ r = parse_sec(value, &manager->exec_delay_usec);
+
+ } else if (proc_cmdline_key_streq(key, "udev.timeout_signal")) {
+
+ if (proc_cmdline_value_missing(key, value))
+ return 0;
+
+ r = signal_from_string(value);
+ if (r > 0)
+ manager->timeout_signal = r;
+
+ } else if (proc_cmdline_key_streq(key, "udev.blockdev_read_only")) {
+
+ if (!value)
+ manager->blockdev_read_only = true;
+ else {
+ r = parse_boolean(value);
+ if (r < 0)
+ log_warning_errno(r, "Failed to parse udev.blockdev-read-only argument, ignoring: %s", value);
+ else
+ manager->blockdev_read_only = r;
+ }
+
+ if (manager->blockdev_read_only)
+ log_notice("All physical block devices will be marked read-only.");
+
+ return 0;
+
+ } else {
+ if (startswith(key, "udev."))
+ log_warning("Unknown udev kernel command line option \"%s\", ignoring.", key);
+
+ return 0;
+ }
+
+ if (r < 0)
+ log_warning_errno(r, "Failed to parse \"%s=%s\", ignoring: %m", key, value);
+
+ return 0;
+}
+
+static int help(void) {
+ _cleanup_free_ char *link = NULL;
+ int r;
+
+ r = terminal_urlify_man("systemd-udevd.service", "8", &link);
+ if (r < 0)
+ return log_oom();
+
+ printf("%s [OPTIONS...]\n\n"
+ "Rule-based manager for device events and files.\n\n"
+ " -h --help Print this message\n"
+ " -V --version Print version of the program\n"
+ " -d --daemon Detach and run in the background\n"
+ " -D --debug Enable debug output\n"
+ " -c --children-max=INT Set maximum number of workers\n"
+ " -e --exec-delay=SECONDS Seconds to wait before executing RUN=\n"
+ " -t --event-timeout=SECONDS Seconds to wait before terminating an event\n"
+ " -N --resolve-names=early|late|never\n"
+ " When to resolve users and groups\n"
+ "\nSee the %s for details.\n",
+ program_invocation_short_name,
+ link);
+
+ return 0;
+}
+
+static int parse_argv(int argc, char *argv[], Manager *manager) {
+ enum {
+ ARG_TIMEOUT_SIGNAL,
+ };
+
+ static const struct option options[] = {
+ { "daemon", no_argument, NULL, 'd' },
+ { "debug", no_argument, NULL, 'D' },
+ { "children-max", required_argument, NULL, 'c' },
+ { "exec-delay", required_argument, NULL, 'e' },
+ { "event-timeout", required_argument, NULL, 't' },
+ { "resolve-names", required_argument, NULL, 'N' },
+ { "help", no_argument, NULL, 'h' },
+ { "version", no_argument, NULL, 'V' },
+ { "timeout-signal", required_argument, NULL, ARG_TIMEOUT_SIGNAL },
+ {}
+ };
+
+ int c, r;
+
+ assert(argc >= 0);
+ assert(argv);
+ assert(manager);
+
+ while ((c = getopt_long(argc, argv, "c:de:Dt:N:hV", options, NULL)) >= 0) {
+ switch (c) {
+
+ case 'd':
+ arg_daemonize = true;
+ break;
+ case 'c':
+ r = safe_atou(optarg, &manager->children_max);
+ if (r < 0)
+ log_warning_errno(r, "Failed to parse --children-max= value '%s', ignoring: %m", optarg);
+ break;
+ case 'e':
+ r = parse_sec(optarg, &manager->exec_delay_usec);
+ if (r < 0)
+ log_warning_errno(r, "Failed to parse --exec-delay= value '%s', ignoring: %m", optarg);
+ break;
+ case ARG_TIMEOUT_SIGNAL:
+ r = signal_from_string(optarg);
+ if (r <= 0)
+ log_warning_errno(r, "Failed to parse --timeout-signal= value '%s', ignoring: %m", optarg);
+ else
+ manager->timeout_signal = r;
+
+ break;
+ case 't':
+ r = parse_sec(optarg, &manager->timeout_usec);
+ if (r < 0)
+ log_warning_errno(r, "Failed to parse --event-timeout= value '%s', ignoring: %m", optarg);
+ break;
+ case 'D':
+ arg_debug = true;
+ break;
+ case 'N': {
+ ResolveNameTiming t;
+
+ t = resolve_name_timing_from_string(optarg);
+ if (t < 0)
+ log_warning("Invalid --resolve-names= value '%s', ignoring.", optarg);
+ else
+ manager->resolve_name_timing = t;
+ break;
+ }
+ case 'h':
+ return help();
+ case 'V':
+ printf("%s\n", GIT_VERSION);
+ return 0;
+ case '?':
+ return -EINVAL;
+ default:
+ assert_not_reached();
+
+ }
+ }
+
+ return 1;
+}
+
+int run_udevd(int argc, char *argv[]) {
+ _cleanup_(manager_freep) Manager *manager = NULL;
+ int fd_ctrl = -EBADF, fd_uevent = -EBADF;
+ int r;
+
+ log_set_target(LOG_TARGET_AUTO);
+ log_open();
+
+ manager = manager_new();
+ if (!manager)
+ return log_oom();
+
+ manager_parse_udev_config(manager);
+
+ log_parse_environment();
+ log_open(); /* Done again to update after reading configuration. */
+
+ r = parse_argv(argc, argv, manager);
+ if (r <= 0)
+ return r;
+
+ r = proc_cmdline_parse(parse_proc_cmdline_item, manager, PROC_CMDLINE_STRIP_RD_PREFIX);
+ if (r < 0)
+ log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
+
+ if (arg_debug) {
+ log_set_target(LOG_TARGET_CONSOLE);
+ log_set_max_level(LOG_DEBUG);
+ }
+
+ r = must_be_root();
+ if (r < 0)
+ return r;
+
+ /* set umask before creating any file/directory */
+ umask(022);
+
+ r = mac_init();
+ if (r < 0)
+ return r;
+
+ /* Make sure we can have plenty fds (for example for pidfds) */
+ (void) rlimit_nofile_bump(-1);
+
+ r = RET_NERRNO(mkdir("/run/udev", 0755));
+ if (r < 0 && r != -EEXIST)
+ return log_error_errno(r, "Failed to create /run/udev: %m");
+
+ r = listen_fds(&fd_ctrl, &fd_uevent);
+ if (r < 0)
+ return log_error_errno(r, "Failed to listen on fds: %m");
+
+ r = manager_init(manager, fd_ctrl, fd_uevent);
+ if (r < 0)
+ return log_error_errno(r, "Failed to create manager: %m");
+
+ if (arg_daemonize) {
+ pid_t pid;
+
+ log_info("Starting systemd-udevd version " GIT_VERSION);
+
+ /* connect /dev/null to stdin, stdout, stderr */
+ if (log_get_max_level() < LOG_DEBUG) {
+ r = make_null_stdio();
+ if (r < 0)
+ log_warning_errno(r, "Failed to redirect standard streams to /dev/null: %m");
+ }
+
+ pid = fork();
+ if (pid < 0)
+ return log_error_errno(errno, "Failed to fork daemon: %m");
+ if (pid > 0)
+ /* parent */
+ return 0;
+
+ /* child */
+ (void) setsid();
+ }
+
+ return manager_main(manager);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-23 03:51:58 +0000