udev/udevadm-test.c

   1 /*
   2  * Copyright (C) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
   3  * Copyright (C) 2004-2008 Kay Sievers <kay.sievers@vrfy.org>
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <stdlib.h>
  20 #include <string.h>
  21 #include <stdio.h>
  22 #include <stddef.h>
  23 #include <unistd.h>
  24 #include <errno.h>
  25 #include <ctype.h>
  26 #include <fcntl.h>
  27 #include <signal.h>
  28 #include <syslog.h>
  29 #include <getopt.h>
  30 #include <sys/signalfd.h>
  31
  32 #include "udev.h"
  33
  34 int udevadm_test(struct udev *udev, int argc, char *argv[])
  35 {
  36         int resolve_names = 1;
  37         char filename[UTIL_PATH_SIZE];
  38         const char *action = "add";
  39         const char *syspath = NULL;
  40         struct udev_event *event = NULL;
  41         struct udev_device *dev = NULL;
  42         struct udev_rules *rules = NULL;
  43         struct udev_list_entry *entry;
  44         sigset_t mask, sigmask_orig;
  45         int err;
  46         int rc = 0;
  47
  48         static const struct option options[] = {
  49                 { "action", required_argument, NULL, 'a' },
  50                 { "resolve-names", required_argument, NULL, 'N' },
  51                 { "help", no_argument, NULL, 'h' },
  52                 {}
  53         };
  54
  55         info(udev, "version %s\n", VERSION);
  56
  57         for (;;) {
  58                 int option;
  59
  60                 option = getopt_long(argc, argv, "a:s:N:fh", options, NULL);
  61                 if (option == -1)
  62                         break;
  63
  64                 dbg(udev, "option '%c'\n", option);
  65                 switch (option) {
  66                 case 'a':
  67                         action = optarg;
  68                         break;
  69                 case 'N':
  70                         if (strcmp (optarg, "early") == 0) {
  71                                 resolve_names = 1;
  72                         } else if (strcmp (optarg, "late") == 0) {
  73                                 resolve_names = 0;
  74                         } else if (strcmp (optarg, "never") == 0) {
  75                                 resolve_names = -1;
  76                         } else {
  77                                 fprintf(stderr, "resolve-names must be early, late or never\n");
  78                                 err(udev, "resolve-names must be early, late or never\n");
  79                                 exit(EXIT_FAILURE);
  80                         }
  81                         break;
  82                 case 'h':
  83                         printf("Usage: udevadm test OPTIONS <syspath>\n"
  84                                "  --action=<string>     set action string\n"
  85                                "  --help\n\n");
  86                         exit(EXIT_SUCCESS);
  87                 default:
  88                         exit(EXIT_FAILURE);
  89                 }
  90         }
  91         syspath = argv[optind];
  92
  93         if (syspath == NULL) {
  94                 fprintf(stderr, "syspath parameter missing\n");
  95                 rc = 2;
  96                 goto out;
  97         }
  98
  99         printf("This program is for debugging only, it does not run any program,\n"
 100                "specified by a RUN key. It may show incorrect results, because\n"
 101                "some values may be different, or not available at a simulation run.\n"
 102                "\n");
 103
 104         sigprocmask(SIG_SETMASK, NULL, &sigmask_orig);
 105
 106         rules = udev_rules_new(udev, resolve_names);
 107         if (rules == NULL) {
 108                 fprintf(stderr, "error reading rules\n");
 109                 rc = 3;
 110                 goto out;
 111         }
 112
 113         /* add /sys if needed */
 114         if (strncmp(syspath, udev_get_sys_path(udev), strlen(udev_get_sys_path(udev))) != 0)
 115                 util_strscpyl(filename, sizeof(filename), udev_get_sys_path(udev), syspath, NULL);
 116         else
 117                 util_strscpy(filename, sizeof(filename), syspath);
 118         util_remove_trailing_chars(filename, '/');
 119
 120         dev = udev_device_new_from_syspath(udev, filename);
 121         if (dev == NULL) {
 122                 fprintf(stderr, "unable to open device '%s'\n", filename);
 123                 rc = 4;
 124                 goto out;
 125         }
 126
 127         /* skip reading of db, but read kernel parameters */
 128         udev_device_set_info_loaded(dev);
 129         udev_device_read_uevent_file(dev);
 130
 131         udev_device_set_action(dev, action);
 132         event = udev_event_new(dev);
 133
 134         sigfillset(&mask);
 135         sigprocmask(SIG_SETMASK, &mask, &sigmask_orig);
 136         event->fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
 137         if (event->fd_signal < 0) {
 138                 fprintf(stderr, "error creating signalfd\n");
 139                 rc = 5;
 140                 goto out;
 141         }
 142
 143         err = udev_event_execute_rules(event, rules, &sigmask_orig);
 144
 145         udev_list_entry_foreach(entry, udev_device_get_properties_list_entry(dev))
 146                 printf("%s=%s\n", udev_list_entry_get_name(entry), udev_list_entry_get_value(entry));
 147
 148         if (err == 0) {
 149                 udev_list_entry_foreach(entry, udev_list_get_entry(&event->run_list)) {
 150                         char program[UTIL_PATH_SIZE];
 151
 152                         udev_event_apply_format(event, udev_list_entry_get_name(entry), program, sizeof(program));
 153                         printf("run: '%s'\n", program);
 154                 }
 155         }
 156 out:
 157         if (event != NULL && event->fd_signal >= 0)
 158                 close(event->fd_signal);
 159         udev_event_unref(event);
 160         udev_device_unref(dev);
 161         udev_rules_unref(rules);
 162         return rc;
 163 }