udev/udevadm.c

   1 /*
   2  * Copyright (C) 2007-2008 Kay Sievers <kay.sievers@vrfy.org>
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <unistd.h>
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <stddef.h>
  22 #include <string.h>
  23 #include <errno.h>
  24 #include <getopt.h>
  25
  26 #include "udev.h"
  27
  28 static int debug;
  29
  30 static void log_fn(struct udev *udev, int priority,
  31                    const char *file, int line, const char *fn,
  32                    const char *format, va_list args)
  33 {
  34         if (debug) {
  35                 fprintf(stderr, "%s: ", fn);
  36                 vfprintf(stderr, format, args);
  37         } else {
  38                 vsyslog(priority, format, args);
  39         }
  40 }
  41
  42 struct command {
  43         const char *name;
  44         int (*cmd)(struct udev *udev, int argc, char *argv[]);
  45         const char *help;
  46         int debug;
  47 };
  48
  49 static const struct command cmds[];
  50
  51 static int version(struct udev *udev, int argc, char *argv[])
  52 {
  53         printf("%s\n", VERSION);
  54         return 0;
  55 }
  56
  57 static int help(struct udev *udev, int argc, char *argv[])
  58 {
  59         const struct command *cmd;
  60
  61         printf("Usage: udevadm [--help] [--version] [--debug] COMMAND [COMMAND OPTIONS]\n");
  62         for (cmd = cmds; cmd->name != NULL; cmd++)
  63                 if (cmd->help != NULL)
  64                         printf("  %-12s %s\n", cmd->name, cmd->help);
  65         printf("\n");
  66         return 0;
  67 }
  68
  69 static const struct command cmds[] = {
  70         {
  71                 .name = "info",
  72                 .cmd = udevadm_info,
  73                 .help = "query sysfs or the udev database",
  74         },
  75         {
  76                 .name = "trigger",
  77                 .cmd = udevadm_trigger,
  78                 .help = "request events from the kernel",
  79         },
  80         {
  81                 .name = "settle",
  82                 .cmd = udevadm_settle, "",
  83                 .help = "wait for the event queue to finish",
  84         },
  85         {
  86                 .name = "control",
  87                 .cmd = udevadm_control,
  88                 .help = "control the udev daemon",
  89         },
  90         {
  91                 .name = "monitor",
  92                 .cmd = udevadm_monitor,
  93                 .help = "listen to kernel and udev events",
  94         },
  95         {
  96                 .name = "test",
  97                 .cmd = udevadm_test,
  98                 .help = "simulation run",
  99                 .debug = 1,
 100         },
 101         {
 102                 .name = "version",
 103                 .cmd = version,
 104         },
 105         {
 106                 .name = "help",
 107                 .cmd = help,
 108         },
 109         {}
 110 };
 111
 112 static int run_command(struct udev *udev, const struct command *cmd, int argc, char *argv[])
 113 {
 114         if (cmd->debug) {
 115                 debug = 1;
 116                 if (udev_get_log_priority(udev) < LOG_INFO)
 117                         udev_set_log_priority(udev, LOG_INFO);
 118         }
 119         info(udev, "calling: %s\n", cmd->name);
 120         return cmd->cmd(udev, argc, argv);
 121 }
 122
 123 int main(int argc, char *argv[])
 124 {
 125         struct udev *udev;
 126         static const struct option options[] = {
 127                 { "debug", no_argument, NULL, 'd' },
 128                 { "help", no_argument, NULL, 'h' },
 129                 { "version", no_argument, NULL, 'V' },
 130                 {}
 131         };
 132         const char *command;
 133         int i;
 134         const char *pos;
 135         int rc = 1;
 136
 137         udev = udev_new();
 138         if (udev == NULL)
 139                 goto out;
 140
 141         logging_init("udevadm");
 142         udev_set_log_fn(udev, log_fn);
 143         udev_selinux_init(udev);
 144
 145         /* see if we are a compat link, this will be removed in a future release */
 146         command = argv[0];
 147         pos = strrchr(command, '/');
 148         if (pos != NULL)
 149                 command = &pos[1];
 150
 151         /* the trailing part of the binary or link name is the command */
 152         if (strncmp(command, "udev", 4) == 0)
 153                 command = &command[4];
 154
 155         for (i = 0; cmds[i].cmd != NULL; i++) {
 156                 if (strcmp(cmds[i].name, command) == 0) {
 157                         char path[128];
 158                         char prog[512];
 159                         ssize_t len;
 160
 161                         snprintf(path, sizeof(path), "/proc/%lu/exe", (unsigned long) getppid());
 162                         len = readlink(path, prog, sizeof(prog));
 163                         if (len > 0) {
 164                                 prog[len] = '\0';
 165                                 fprintf(stderr, "the program '%s' called '%s', it should use 'udevadm %s <options>', "
 166                                        "this will stop working in a future release\n", prog, argv[0], command);
 167                                 err(udev, "the program '%s' called '%s', it should use 'udevadm %s <options>', "
 168                                     "this will stop working in a future release\n", prog, argv[0], command);
 169                         }
 170                         rc = run_command(udev, &cmds[i], argc, argv);
 171                         goto out;
 172                 }
 173         }
 174
 175         while (1) {
 176                 int option;
 177
 178                 option = getopt_long(argc, argv, "+dhV", options, NULL);
 179                 if (option == -1)
 180                         break;
 181
 182                 switch (option) {
 183                 case 'd':
 184                         debug = 1;
 185                         if (udev_get_log_priority(udev) < LOG_INFO)
 186                                 udev_set_log_priority(udev, LOG_INFO);
 187                         break;
 188                 case 'h':
 189                         rc = help(udev, argc, argv);
 190                         goto out;
 191                 case 'V':
 192                         rc = version(udev, argc, argv);
 193                         goto out;
 194                 default:
 195                         goto out;
 196                 }
 197         }
 198         command = argv[optind];
 199
 200         if (command != NULL)
 201                 for (i = 0; cmds[i].cmd != NULL; i++) {
 202                         if (strcmp(cmds[i].name, command) == 0) {
 203                                 argc -= optind;
 204                                 argv += optind;
 205                                 optind = 0;
 206                                 rc = run_command(udev, &cmds[i], argc, argv);
 207                                 goto out;
 208                         }
 209                 }
 210
 211         fprintf(stderr, "missing or unknown command\n\n");
 212         help(udev, argc, argv);
 213         rc = 2;
 214 out:
 215         udev_selinux_exit(udev);
 216         udev_unref(udev);
 217         logging_close();
 218         return rc;
 219 }