src/udev/udevadm-trigger.c

   1 /*
   2  * Copyright (C) 2008-2009 Kay Sievers <kay@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 <stdlib.h>
  19 #include <stddef.h>
  20 #include <string.h>
  21 #include <stdio.h>
  22 #include <unistd.h>
  23 #include <getopt.h>
  24 #include <errno.h>
  25 #include <dirent.h>
  26 #include <fcntl.h>
  27 #include <fnmatch.h>
  28 #include <sys/stat.h>
  29 #include <sys/types.h>
  30 #include <sys/socket.h>
  31 #include <sys/un.h>
  32
  33 #include "udev.h"
  34 #include "udev-util.h"
  35 #include "util.h"
  36
  37 static int verbose;
  38 static int dry_run;
  39
  40 static void exec_list(struct udev_enumerate *udev_enumerate, const char *action) {
  41         struct udev_list_entry *entry;
  42
  43         udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(udev_enumerate)) {
  44                 char filename[UTIL_PATH_SIZE];
  45                 int fd;
  46
  47                 if (verbose)
  48                         printf("%s\n", udev_list_entry_get_name(entry));
  49                 if (dry_run)
  50                         continue;
  51                 strscpyl(filename, sizeof(filename), udev_list_entry_get_name(entry), "/uevent", NULL);
  52                 fd = open(filename, O_WRONLY|O_CLOEXEC);
  53                 if (fd < 0)
  54                         continue;
  55                 if (write(fd, action, strlen(action)) < 0)
  56                         log_debug("error writing '%s' to '%s': %m", action, filename);
  57                 close(fd);
  58         }
  59 }
  60
  61 static const char *keyval(const char *str, const char **val, char *buf, size_t size) {
  62         char *pos;
  63
  64         strscpy(buf, size,str);
  65         pos = strchr(buf, '=');
  66         if (pos != NULL) {
  67                 pos[0] = 0;
  68                 pos++;
  69         }
  70         *val = pos;
  71         return buf;
  72 }
  73
  74 static void help(void) {
  75         printf("Usage: udevadm trigger OPTIONS\n"
  76                "  -v,--verbose                       print the list of devices while running\n"
  77                "  -n,--dry-run                       do not actually trigger the events\n"
  78                "  -t,--type=                         type of events to trigger\n"
  79                "          devices                       sys devices (default)\n"
  80                "          subsystems                    sys subsystems and drivers\n"
  81                "  -c,--action=<action>               event action value, default is \"change\"\n"
  82                "  -s,--subsystem-match=<subsystem>   trigger devices from a matching subsystem\n"
  83                "  -S,--subsystem-nomatch=<subsystem> exclude devices from a matching subsystem\n"
  84                "  -a,--attr-match=<file[=<value>]>   trigger devices with a matching attribute\n"
  85                "  -A,--attr-nomatch=<file[=<value>]> exclude devices with a matching attribute\n"
  86                "  -p,--property-match=<key>=<value>  trigger devices with a matching property\n"
  87                "  -g,--tag-match=<key>=<value>       trigger devices with a matching property\n"
  88                "  -y,--sysname-match=<name>          trigger devices with a matching name\n"
  89                "  -b,--parent-match=<name>           trigger devices with that parent device\n"
  90                "  -h,--help\n\n");
  91 }
  92
  93 static int adm_trigger(struct udev *udev, int argc, char *argv[]) {
  94         static const struct option options[] = {
  95                 { "verbose",           no_argument,       NULL, 'v' },
  96                 { "dry-run",           no_argument,       NULL, 'n' },
  97                 { "type",              required_argument, NULL, 't' },
  98                 { "action",            required_argument, NULL, 'c' },
  99                 { "subsystem-match",   required_argument, NULL, 's' },
 100                 { "subsystem-nomatch", required_argument, NULL, 'S' },
 101                 { "attr-match",        required_argument, NULL, 'a' },
 102                 { "attr-nomatch",      required_argument, NULL, 'A' },
 103                 { "property-match",    required_argument, NULL, 'p' },
 104                 { "tag-match",         required_argument, NULL, 'g' },
 105                 { "sysname-match",     required_argument, NULL, 'y' },
 106                 { "parent-match",      required_argument, NULL, 'b' },
 107                 { "help",              no_argument,       NULL, 'h' },
 108                 {}
 109         };
 110         enum {
 111                 TYPE_DEVICES,
 112                 TYPE_SUBSYSTEMS,
 113         } device_type = TYPE_DEVICES;
 114         const char *action = "change";
 115         _cleanup_udev_enumerate_unref_ struct udev_enumerate *udev_enumerate = NULL;
 116         int c;
 117
 118         udev_enumerate = udev_enumerate_new(udev);
 119         if (udev_enumerate == NULL)
 120                 return 1;
 121
 122         while ((c = getopt_long(argc, argv, "vno:t:c:s:S:a:A:p:g:y:b:h", options, NULL)) >= 0) {
 123                 const char *key;
 124                 const char *val;
 125                 char buf[UTIL_PATH_SIZE];
 126
 127                 switch (c) {
 128                 case 'v':
 129                         verbose = 1;
 130                         break;
 131                 case 'n':
 132                         dry_run = 1;
 133                         break;
 134                 case 't':
 135                         if (streq(optarg, "devices"))
 136                                 device_type = TYPE_DEVICES;
 137                         else if (streq(optarg, "subsystems"))
 138                                 device_type = TYPE_SUBSYSTEMS;
 139                         else {
 140                                 log_error("unknown type --type=%s", optarg);
 141                                 return 2;
 142                         }
 143                         break;
 144                 case 'c':
 145                         if (!nulstr_contains("add\0" "remove\0" "change\0", optarg)) {
 146                                 log_error("unknown action '%s'", optarg);
 147                                 return 2;
 148                         } else
 149                                 action = optarg;
 150
 151                         break;
 152                 case 's':
 153                         udev_enumerate_add_match_subsystem(udev_enumerate, optarg);
 154                         break;
 155                 case 'S':
 156                         udev_enumerate_add_nomatch_subsystem(udev_enumerate, optarg);
 157                         break;
 158                 case 'a':
 159                         key = keyval(optarg, &val, buf, sizeof(buf));
 160                         udev_enumerate_add_match_sysattr(udev_enumerate, key, val);
 161                         break;
 162                 case 'A':
 163                         key = keyval(optarg, &val, buf, sizeof(buf));
 164                         udev_enumerate_add_nomatch_sysattr(udev_enumerate, key, val);
 165                         break;
 166                 case 'p':
 167                         key = keyval(optarg, &val, buf, sizeof(buf));
 168                         udev_enumerate_add_match_property(udev_enumerate, key, val);
 169                         break;
 170                 case 'g':
 171                         udev_enumerate_add_match_tag(udev_enumerate, optarg);
 172                         break;
 173                 case 'y':
 174                         udev_enumerate_add_match_sysname(udev_enumerate, optarg);
 175                         break;
 176                 case 'b': {
 177                         char path[UTIL_PATH_SIZE];
 178                         struct udev_device *dev;
 179
 180                         /* add sys dir if needed */
 181                         if (!startswith(optarg, "/sys"))
 182                                 strscpyl(path, sizeof(path), "/sys", optarg, NULL);
 183                         else
 184                                 strscpy(path, sizeof(path), optarg);
 185                         util_remove_trailing_chars(path, '/');
 186                         dev = udev_device_new_from_syspath(udev, path);
 187                         if (dev == NULL) {
 188                                 log_error("unable to open the device '%s'", optarg);
 189                                 return 2;
 190                         }
 191                         udev_enumerate_add_match_parent(udev_enumerate, dev);
 192                         /* drop reference immediately, enumerate pins the device as long as needed */
 193                         udev_device_unref(dev);
 194                         break;
 195                 }
 196                 case 'h':
 197                         help();
 198                         return 0;
 199                 case '?':
 200                         return 1;
 201                 default:
 202                         assert_not_reached("Unknown option");
 203                 }
 204         }
 205
 206         if (optind < argc) {
 207                 fprintf(stderr, "Extraneous argument: '%s'\n", argv[optind]);
 208                 return 1;
 209         }
 210
 211         switch (device_type) {
 212         case TYPE_SUBSYSTEMS:
 213                 udev_enumerate_scan_subsystems(udev_enumerate);
 214                 exec_list(udev_enumerate, action);
 215                 return 0;
 216         case TYPE_DEVICES:
 217                 udev_enumerate_scan_devices(udev_enumerate);
 218                 exec_list(udev_enumerate, action);
 219                 return 0;
 220         default:
 221                 assert_not_reached("device_type");
 222         }
 223 }
 224
 225 const struct udevadm_cmd udevadm_trigger = {
 226         .name = "trigger",
 227         .cmd = adm_trigger,
 228         .help = "request events from the kernel",
 229 };