569ad251ad
Checking if we are root on the client side is generally pointless, since the privileged operation will fail anyway and we can than log what precisly went wrong. A check like this makes sense only if: - we need to do some expensive unprivileged operation before attempting the privileged operation, and the check allows us avoid wasting resources. - the privileged operation would fail but in an unclear way. Neither of those cases applies here. This fixes calls like 'udevadm control -h' as unprivileged user.
186 lines
8.4 KiB
C
186 lines
8.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <errno.h>
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#include <getopt.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "parse-util.h"
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#include "process-util.h"
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#include "syslog-util.h"
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#include "time-util.h"
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#include "udevadm.h"
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#include "udev-ctrl.h"
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#include "util.h"
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#include "virt.h"
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static int help(void) {
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printf("%s control OPTION\n\n"
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"Control the udev daemon.\n\n"
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" -h --help Show this help\n"
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" -V --version Show package version\n"
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" -e --exit Instruct the daemon to cleanup and exit\n"
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" -l --log-priority=LEVEL Set the udev log level for the daemon\n"
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" -s --stop-exec-queue Do not execute events, queue only\n"
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" -S --start-exec-queue Execute events, flush queue\n"
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" -R --reload Reload rules and databases\n"
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" -p --property=KEY=VALUE Set a global property for all events\n"
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" -m --children-max=N Maximum number of children\n"
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" --ping Wait for udev to respond to a ping message\n"
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" -t --timeout=SECONDS Maximum time to block for a reply\n"
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, program_invocation_short_name);
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return 0;
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}
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int control_main(int argc, char *argv[], void *userdata) {
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_cleanup_(udev_ctrl_unrefp) struct udev_ctrl *uctrl = NULL;
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usec_t timeout = 60 * USEC_PER_SEC;
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int c, r;
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enum {
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ARG_PING = 0x100,
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};
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static const struct option options[] = {
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{ "exit", no_argument, NULL, 'e' },
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{ "log-priority", required_argument, NULL, 'l' },
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{ "stop-exec-queue", no_argument, NULL, 's' },
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{ "start-exec-queue", no_argument, NULL, 'S' },
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{ "reload", no_argument, NULL, 'R' },
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{ "reload-rules", no_argument, NULL, 'R' }, /* alias for -R */
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{ "property", required_argument, NULL, 'p' },
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{ "env", required_argument, NULL, 'p' }, /* alias for -p */
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{ "children-max", required_argument, NULL, 'm' },
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{ "ping", no_argument, NULL, ARG_PING },
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{ "timeout", required_argument, NULL, 't' },
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{ "version", no_argument, NULL, 'V' },
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{ "help", no_argument, NULL, 'h' },
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{}
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};
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if (running_in_chroot() > 0) {
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log_info("Running in chroot, ignoring request.");
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return 0;
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}
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if (argc <= 1)
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"This command expects one or more options.");
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r = udev_ctrl_new(&uctrl);
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if (r < 0)
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return log_error_errno(r, "Failed to initialize udev control: %m");
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while ((c = getopt_long(argc, argv, "el:sSRp:m:t:Vh", options, NULL)) >= 0)
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switch (c) {
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case 'e':
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r = udev_ctrl_send_exit(uctrl);
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if (r == -ENOANO)
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log_warning("Cannot specify --exit after --exit, ignoring.");
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else if (r < 0)
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return log_error_errno(r, "Failed to send exit request: %m");
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break;
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case 'l':
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r = log_level_from_string(optarg);
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if (r < 0)
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return log_error_errno(r, "Failed to parse log priority '%s': %m", optarg);
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r = udev_ctrl_send_set_log_level(uctrl, r);
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if (r == -ENOANO)
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log_warning("Cannot specify --log-priority after --exit, ignoring.");
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else if (r < 0)
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return log_error_errno(r, "Failed to send request to set log level: %m");
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break;
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case 's':
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r = udev_ctrl_send_stop_exec_queue(uctrl);
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if (r == -ENOANO)
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log_warning("Cannot specify --stop-exec-queue after --exit, ignoring.");
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else if (r < 0)
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return log_error_errno(r, "Failed to send request to stop exec queue: %m");
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break;
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case 'S':
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r = udev_ctrl_send_start_exec_queue(uctrl);
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if (r == -ENOANO)
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log_warning("Cannot specify --start-exec-queue after --exit, ignoring.");
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else if (r < 0)
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return log_error_errno(r, "Failed to send request to start exec queue: %m");
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break;
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case 'R':
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r = udev_ctrl_send_reload(uctrl);
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if (r == -ENOANO)
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log_warning("Cannot specify --reload after --exit, ignoring.");
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else if (r < 0)
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return log_error_errno(r, "Failed to send reload request: %m");
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break;
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case 'p':
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if (!strchr(optarg, '='))
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "expect <KEY>=<value> instead of '%s'", optarg);
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r = udev_ctrl_send_set_env(uctrl, optarg);
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if (r == -ENOANO)
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log_warning("Cannot specify --property after --exit, ignoring.");
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else if (r < 0)
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return log_error_errno(r, "Failed to send request to update environment: %m");
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break;
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case 'm': {
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unsigned i;
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r = safe_atou(optarg, &i);
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if (r < 0)
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return log_error_errno(r, "Failed to parse maximum number of events '%s': %m", optarg);
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r = udev_ctrl_send_set_children_max(uctrl, i);
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if (r == -ENOANO)
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log_warning("Cannot specify --children-max after --exit, ignoring.");
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else if (r < 0)
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return log_error_errno(r, "Failed to send request to set number of children: %m");
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break;
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}
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case ARG_PING:
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r = udev_ctrl_send_ping(uctrl);
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if (r == -ENOANO)
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log_error("Cannot specify --ping after --exit, ignoring.");
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else if (r < 0)
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return log_error_errno(r, "Failed to send a ping message: %m");
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break;
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case 't':
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r = parse_sec(optarg, &timeout);
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if (r < 0)
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return log_error_errno(r, "Failed to parse timeout value '%s': %m", optarg);
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break;
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case 'V':
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return print_version();
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case 'h':
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return help();
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case '?':
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return -EINVAL;
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default:
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assert_not_reached("Unknown option.");
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}
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if (optind < argc)
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"Extraneous argument: %s", argv[optind]);
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r = udev_ctrl_wait(uctrl, timeout);
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if (r < 0)
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return log_error_errno(r, "Failed to wait for daemon to reply: %m");
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return 0;
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}
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