release/src/router/udev/udevtest.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
  36 #ifdef USE_LOG
  37 void log_message (int priority, const char *format, ...)
  38 {
  39         va_list args;
  40
  41         if (priority > udev_log_priority)
  42                 return;
  43
  44         va_start(args, format);
  45         vprintf(format, args);
  46         va_end(args);
  47         printf("\n");
  48 }
  49 #endif
  50
  51 static int import_uevent_var(const char *devpath)
  52 {
  53         char path[PATH_SIZE];
  54         static char value[4096]; /* must stay, used with putenv */
  55         ssize_t size;
  56         int fd;
  57         char *key;
  58         char *next;
  59         int rc = -1;
  60
  61         /* read uevent file */
  62         strlcpy(path, sysfs_path, sizeof(path));
  63         strlcat(path, devpath, sizeof(path));
  64         strlcat(path, "/uevent", sizeof(path));
  65         fd = open(path, O_RDONLY);
  66         if (fd < 0)
  67                 goto out;
  68         size = read(fd, value, sizeof(value));
  69         close(fd);
  70         if (size < 0)
  71                 goto out;
  72         value[size] = '\0';
  73
  74         /* import keys into environment */
  75         key = value;
  76         while (key[0] != '\0') {
  77                 next = strchr(key, '\n');
  78                 if (next == NULL)
  79                         goto out;
  80                 next[0] = '\0';
  81                 info("import into environment: '%s'", key);
  82                 putenv(key);
  83                 key = &next[1];
  84         }
  85         rc = 0;
  86 out:
  87         return rc;
  88 }
  89
  90 int main(int argc, char *argv[], char *envp[])
  91 {
  92         int force = 0;
  93         char *action = "add";
  94         char *subsystem = NULL;
  95         char *devpath = NULL;
  96         struct udevice *udev;
  97         struct sysfs_device *dev;
  98         struct udev_rules rules = {};
  99         int retval;
 100         int rc = 0;
 101
 102         static const struct option options[] = {
 103                 { "action", 1, NULL, 'a' },
 104                 { "subsystem", 1, NULL, 's' },
 105                 { "force", 0, NULL, 'f' },
 106                 { "help", 0, NULL, 'h' },
 107                 {}
 108         };
 109
 110         info("version %s", UDEV_VERSION);
 111         udev_config_init();
 112         if (udev_log_priority < LOG_INFO) {
 113                 char priority[32];
 114
 115                 udev_log_priority = LOG_INFO;
 116                 sprintf(priority, "%i", udev_log_priority);
 117                 setenv("UDEV_LOG", priority, 1);
 118         }
 119
 120         while (1) {
 121                 int option;
 122
 123                 option = getopt_long(argc, argv, "a:s:fh", options, NULL);
 124                 if (option == -1)
 125                         break;
 126
 127                 dbg("option '%c'", option);
 128                 switch (option) {
 129                 case 'a':
 130                         action = optarg;
 131                         break;
 132                 case 's':
 133                         subsystem = optarg;
 134                         break;
 135                 case 'f':
 136                         force = 1;
 137                         break;
 138                 case 'h':
 139                         printf("Usage: udevtest OPTIONS <devpath>\n"
 140                                "  --action=<string>     set action string\n"
 141                                "  --subsystem=<string>  set subsystem string\n"
 142                                "  --force               don't skip node/link creation\n"
 143                                "  --help                print this help text\n\n");
 144                         exit(0);
 145                 default:
 146                         exit(1);
 147                 }
 148         }
 149         devpath = argv[optind];
 150
 151         if (devpath == NULL) {
 152                 fprintf(stderr, "devpath parameter missing\n");
 153                 rc = 1;
 154                 goto exit;
 155         }
 156
 157         printf("This program is for debugging only, it does not run any program,\n"
 158                "specified by a RUN key. It may show incorrect results, because\n"
 159                "some values may be different, or not available at a simulation run.\n"
 160                "\n");
 161
 162         sysfs_init();
 163         udev_rules_init(&rules, 0);
 164
 165         /* remove /sys if given */
 166         if (strncmp(devpath, sysfs_path, strlen(sysfs_path)) == 0)
 167                 devpath = &devpath[strlen(sysfs_path)];
 168
 169         dev = sysfs_device_get(devpath);
 170         if (dev == NULL) {
 171                 fprintf(stderr, "unable to open device '%s'\n", devpath);
 172                 rc = 2;
 173                 goto exit;
 174         }
 175
 176         udev = udev_device_init(NULL);
 177         if (udev == NULL) {
 178                 fprintf(stderr, "error initializing device\n");
 179                 rc = 3;
 180                 goto exit;
 181         }
 182
 183         if (subsystem != NULL)
 184                 strlcpy(dev->subsystem, subsystem, sizeof(dev->subsystem));
 185
 186         /* override built-in sysfs device */
 187         udev->dev = dev;
 188         strlcpy(udev->action, action, sizeof(udev->action));
 189         udev->devt = udev_device_get_devt(udev);
 190
 191         /* simulate node creation with test flag */
 192         if (!force)
 193                 udev->test_run = 1;
 194
 195         setenv("DEVPATH", udev->dev->devpath, 1);
 196         setenv("SUBSYSTEM", udev->dev->subsystem, 1);
 197         setenv("ACTION", udev->action, 1);
 198         import_uevent_var(udev->dev->devpath);
 199
 200         info("looking at device '%s' from subsystem '%s'", udev->dev->devpath, udev->dev->subsystem);
 201         retval = udev_device_event(&rules, udev);
 202         if (retval == 0 && !udev->ignore_device && udev_run) {
 203                 struct name_entry *name_loop;
 204
 205                 list_for_each_entry(name_loop, &udev->run_list, node) {
 206                         char program[PATH_SIZE];
 207
 208                         strlcpy(program, name_loop->name, sizeof(program));
 209                         udev_rules_apply_format(udev, program, sizeof(program));
 210                         info("run: '%s'", program);
 211                 }
 212         }
 213         udev_device_cleanup(udev);
 214
 215 exit:
 216         udev_rules_cleanup(&rules);
 217         sysfs_cleanup();
 218         return rc;
 219 }