udev/udevadm-test.c

   1 /*
   2  * Copyright (C) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
   3  * Copyright (C) 2004-2006 Kay Sievers <kay.sievers@vrfy.org>
   4  *
   5  *      This program is free software; you can redistribute it and/or modify it
   6  *      under the terms of the GNU General Public License as published by the
   7  *      Free Software Foundation version 2 of the License.
   8  *
   9  *      This program is distributed in the hope that it will be useful, but
  10  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *      General Public License for more details.
  13  *
  14  *      You should have received a copy of the GNU General Public License along
  15  *      with this program; if not, write to the Free Software Foundation, Inc.,
  16  *      51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  17  *
  18  */
  19
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <stdio.h>
  23 #include <stddef.h>
  24 #include <unistd.h>
  25 #include <errno.h>
  26 #include <ctype.h>
  27 #include <fcntl.h>
  28 #include <signal.h>
  29 #include <syslog.h>
  30 #include <getopt.h>
  31
  32 #include "udev.h"
  33 #include "udev_rules.h"
  34
  35 static int import_uevent_var(const char *devpath)
  36 {
  37         char path[PATH_SIZE];
  38         static char value[4096]; /* must stay, used with putenv */
  39         ssize_t size;
  40         int fd;
  41         char *key;
  42         char *next;
  43         int rc = -1;
  44
  45         /* read uevent file */
  46         strlcpy(path, sysfs_path, sizeof(path));
  47         strlcat(path, devpath, sizeof(path));
  48         strlcat(path, "/uevent", sizeof(path));
  49         fd = open(path, O_RDONLY);
  50         if (fd < 0)
  51                 goto out;
  52         size = read(fd, value, sizeof(value));
  53         close(fd);
  54         if (size < 0)
  55                 goto out;
  56         value[size] = '\0';
  57
  58         /* import keys into environment */
  59         key = value;
  60         while (key[0] != '\0') {
  61                 next = strchr(key, '\n');
  62                 if (next == NULL)
  63                         goto out;
  64                 next[0] = '\0';
  65                 info("import into environment: '%s'\n", key);
  66                 putenv(key);
  67                 key = &next[1];
  68         }
  69         rc = 0;
  70 out:
  71         return rc;
  72 }
  73
  74 int udevadm_test(int argc, char *argv[])
  75 {
  76         int force = 0;
  77         const char *action = "add";
  78         const char *subsystem = NULL;
  79         const char *devpath = NULL;
  80         struct udevice *udev;
  81         struct sysfs_device *dev;
  82         struct udev_rules rules = {};
  83         int retval;
  84         int rc = 0;
  85
  86         static const struct option options[] = {
  87                 { "action", 1, NULL, 'a' },
  88                 { "subsystem", 1, NULL, 's' },
  89                 { "force", 0, NULL, 'f' },
  90                 { "help", 0, NULL, 'h' },
  91                 {}
  92         };
  93
  94         info("version %s\n", VERSION);
  95         if (udev_log_priority < LOG_INFO) {
  96                 char priority[32];
  97
  98                 udev_log_priority = LOG_INFO;
  99                 sprintf(priority, "%i", udev_log_priority);
 100                 setenv("UDEV_LOG", priority, 1);
 101         }
 102
 103         while (1) {
 104                 int option;
 105
 106                 option = getopt_long(argc, argv, "a:s:fh", options, NULL);
 107                 if (option == -1)
 108                         break;
 109
 110                 dbg("option '%c'\n", option);
 111                 switch (option) {
 112                 case 'a':
 113                         action = optarg;
 114                         break;
 115                 case 's':
 116                         subsystem = optarg;
 117                         break;
 118                 case 'f':
 119                         force = 1;
 120                         break;
 121                 case 'h':
 122                         printf("Usage: udevadm test OPTIONS <devpath>\n"
 123                                "  --action=<string>     set action string\n"
 124                                "  --subsystem=<string>  set subsystem string\n"
 125                                "  --force               don't skip node/link creation\n"
 126                                "  --help                print this help text\n\n");
 127                         exit(0);
 128                 default:
 129                         exit(1);
 130                 }
 131         }
 132         devpath = argv[optind];
 133
 134         if (devpath == NULL) {
 135                 fprintf(stderr, "devpath parameter missing\n");
 136                 rc = 1;
 137                 goto exit;
 138         }
 139
 140         printf("This program is for debugging only, it does not run any program,\n"
 141                "specified by a RUN key. It may show incorrect results, because\n"
 142                "some values may be different, or not available at a simulation run.\n"
 143                "\n");
 144
 145         udev_rules_init(&rules, 0);
 146
 147         /* remove /sys if given */
 148         if (strncmp(devpath, sysfs_path, strlen(sysfs_path)) == 0)
 149                 devpath = &devpath[strlen(sysfs_path)];
 150
 151         dev = sysfs_device_get(devpath);
 152         if (dev == NULL) {
 153                 fprintf(stderr, "unable to open device '%s'\n", devpath);
 154                 rc = 2;
 155                 goto exit;
 156         }
 157
 158         udev = udev_device_init();
 159         if (udev == NULL) {
 160                 fprintf(stderr, "error initializing device\n");
 161                 rc = 3;
 162                 goto exit;
 163         }
 164
 165         if (subsystem != NULL)
 166                 strlcpy(dev->subsystem, subsystem, sizeof(dev->subsystem));
 167
 168         /* override built-in sysfs device */
 169         udev->dev = dev;
 170         strlcpy(udev->action, action, sizeof(udev->action));
 171         udev->devt = udev_device_get_devt(udev);
 172
 173         /* simulate node creation with test flag */
 174         if (!force)
 175                 udev->test_run = 1;
 176
 177         setenv("DEVPATH", udev->dev->devpath, 1);
 178         setenv("SUBSYSTEM", udev->dev->subsystem, 1);
 179         setenv("ACTION", udev->action, 1);
 180         import_uevent_var(udev->dev->devpath);
 181
 182         info("looking at device '%s' from subsystem '%s'\n", udev->dev->devpath, udev->dev->subsystem);
 183         retval = udev_device_event(&rules, udev);
 184
 185         if (udev->event_timeout >= 0)
 186                 info("custom event timeout: %i\n", udev->event_timeout);
 187
 188         if (retval == 0 && !udev->ignore_device && udev_run) {
 189                 struct name_entry *name_loop;
 190
 191                 list_for_each_entry(name_loop, &udev->run_list, node) {
 192                         char program[PATH_SIZE];
 193
 194                         strlcpy(program, name_loop->name, sizeof(program));
 195                         udev_rules_apply_format(udev, program, sizeof(program));
 196                         info("run: '%s'\n", program);
 197                 }
 198         }
 199         udev_device_cleanup(udev);
 200
 201 exit:
 202         udev_rules_cleanup(&rules);
 203         return rc;
 204 }