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Sourcecode: udev version File versions

udev_rules.c

/*
 * udev_rules.c
 *
 * Userspace devfs
 *
 * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
 * Copyright (C) 2003-2005 Kay Sievers <kay.sievers@vrfy.org>
 *
 *
 *    This program is free software; you can redistribute it and/or modify it
 *    under the terms of the GNU General Public License as published by the
 *    Free Software Foundation version 2 of the License.
 * 
 *    This program is distributed in the hope that it will be useful, but
 *    WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *    General Public License for more details.
 * 
 *    You should have received a copy of the GNU General Public License along
 *    with this program; if not, write to the Free Software Foundation, Inc.,
 *    675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <fcntl.h>
#include <ctype.h>
#include <unistd.h>
#include <errno.h>
#include <sys/wait.h>
#include <sys/stat.h>

#include "libsysfs/sysfs/libsysfs.h"
#include "list.h"
#include "udev_libc_wrapper.h"
#include "udev.h"
#include "udev_utils.h"
#include "udev_version.h"
#include "logging.h"
#include "udev_rules.h"
#include "udev_db.h"

static struct sysfs_attribute *find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, char *attr);

/* compare string with pattern (supports * ? [0-9] [!A-Z]) */
static int strcmp_pattern(const char *p, const char *s)
{
      if (s[0] == '\0') {
            while (p[0] == '*')
                  p++;
            return (p[0] != '\0');
      }
      switch (p[0]) {
      case '[':
            {
                  int not = 0;
                  p++;
                  if (p[0] == '!') {
                        not = 1;
                        p++;
                  }
                  while ((p[0] != '\0') && (p[0] != ']')) {
                        int match = 0;
                        if (p[1] == '-') {
                              if ((s[0] >= p[0]) && (s[0] <= p[2]))
                                    match = 1;
                              p += 3;
                        } else {
                              match = (p[0] == s[0]);
                              p++;
                        }
                        if (match ^ not) {
                              while ((p[0] != '\0') && (p[0] != ']'))
                                    p++;
                              if (p[0] == ']')
                                    return strcmp_pattern(p+1, s+1);
                        }
                  }
            }
            break;
      case '*':
            if (strcmp_pattern(p, s+1))
                  return strcmp_pattern(p+1, s);
            return 0;
      case '\0':
            if (s[0] == '\0') {
                  return 0;
            }
            break;
      default:
            if ((p[0] == s[0]) || (p[0] == '?'))
                  return strcmp_pattern(p+1, s+1);
            break;
      }
      return 1;
}

/* extract possible {attr} and move str behind it */
static char *get_format_attribute(char **str)
{
      char *pos;
      char *attr = NULL;

      if (*str[0] == '{') {
            pos = strchr(*str, '}');
            if (pos == NULL) {
                  dbg("missing closing brace for format");
                  return NULL;
            }
            pos[0] = '\0';
            attr = *str+1;
            *str = pos+1;
            dbg("attribute='%s', str='%s'", attr, *str);
      }
      return attr;
}

/* extract possible format length and move str behind it*/
static int get_format_len(char **str)
{
      int num;
      char *tail;

      if (isdigit(*str[0])) {
            num = (int) strtoul(*str, &tail, 10);
            if (num > 0) {
                  *str = tail;
                  dbg("format length=%i", num);
                  return num;
            } else {
                  dbg("format parsing error '%s'", *str);
            }
      }
      return -1;
}

/** Finds the lowest positive N such that <name>N isn't present in 
 *  $(udevroot) either as a file or a symlink.
 *
 *  @param  name                Name to check for
 *  @return                     0 if <name> didn't exist and N otherwise.
 */
static int find_free_number(struct udevice *udev, const char *name)
{
      char devpath[PATH_SIZE];
      char filename[PATH_SIZE];
      int num = 0;

      strlcpy(filename, name, sizeof(filename));
      while (1) {
            dbg("look for existing node '%s'", filename);
            if (udev_db_search_name(devpath, sizeof(devpath), filename) != 0) {
                  dbg("free num=%d", num);
                  return num;
            }

            num++;
            if (num > 1000) {
                  info("find_free_number gone crazy (num=%d), aborted", num);
                  return -1;
            }
            snprintf(filename, sizeof(filename), "%s%d", name, num);
            filename[sizeof(filename)-1] = '\0';
      }
}

static void apply_format(struct udevice *udev, char *string, size_t maxsize,
                   struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
{
      char temp[PATH_SIZE];
      char temp2[PATH_SIZE];
      char *tail, *pos, *cpos, *attr, *rest;
      int len;
      int i;
      char c;
      struct sysfs_attribute *tmpattr;
      unsigned int next_free_number;
      struct sysfs_class_device *class_dev_parent;

      pos = string;
      while (1) {
            pos = strchr(pos, '%');
            if (pos == NULL)
                  break;

            pos[0] = '\0';
            tail = pos+1;
            len = get_format_len(&tail);
            c = tail[0];
            strlcpy(temp, tail+1, sizeof(temp));
            tail = temp;
            dbg("format=%c, string='%s', tail='%s'",c , string, tail);
            attr = get_format_attribute(&tail);

            switch (c) {
            case 'p':
                  strlcat(string, udev->devpath, maxsize);
                  dbg("substitute kernel name '%s'", udev->kernel_name);
                  break;
            case 'b':
                  strlcat(string, udev->bus_id, maxsize);
                  dbg("substitute bus_id '%s'", udev->bus_id);
                  break;
            case 'k':
                  strlcat(string, udev->kernel_name, maxsize);
                  dbg("substitute kernel name '%s'", udev->kernel_name);
                  break;
            case 'n':
                  strlcat(string, udev->kernel_number, maxsize);
                  dbg("substitute kernel number '%s'", udev->kernel_number);
                        break;
            case 'm':
                  sprintf(temp2, "%d", minor(udev->devt));
                  strlcat(string, temp2, maxsize);
                  dbg("substitute minor number '%s'", temp2);
                  break;
            case 'M':
                  sprintf(temp2, "%d", major(udev->devt));
                  strlcat(string, temp2, maxsize);
                  dbg("substitute major number '%s'", temp2);
                  break;
            case 'c':
                  if (udev->program_result[0] == '\0')
                        break;
                  /* get part part of the result string */
                  i = 0;
                  if (attr != NULL)
                        i = strtoul(attr, &rest, 10);
                  if (i > 0) {
                        dbg("request part #%d of result string", i);
                        cpos = udev->program_result;
                        while (--i) {
                              while (cpos[0] != '\0' && !isspace(cpos[0]))
                                    cpos++;
                              while (isspace(cpos[0]))
                                    cpos++;
                        }
                        if (i > 0) {
                              dbg("requested part of result string not found");
                              break;
                        }
                        strlcpy(temp2, cpos, sizeof(temp2));
                        /* %{2+}c copies the whole string from the second part on */
                        if (rest[0] != '+') {
                              cpos = strchr(temp2, ' ');
                              if (cpos)
                                    cpos[0] = '\0';
                        }
                        strlcat(string, temp2, maxsize);
                        dbg("substitute part of result string '%s'", temp2);
                  } else {
                        strlcat(string, udev->program_result, maxsize);
                        dbg("substitute result string '%s'", udev->program_result);
                  }
                  break;
            case 's':
                  if (!class_dev)
                        break;
                  if (attr == NULL) {
                        dbg("missing attribute");
                        break;
                  }
                  tmpattr = find_sysfs_attribute(class_dev, sysfs_device, attr);
                  if (tmpattr == NULL) {
                        dbg("sysfa attribute '%s' not found", attr);
                        break;
                  }
                  /* strip trailing whitespace of matching value */
                  if (isspace(tmpattr->value[strlen(tmpattr->value)-1])) {
                        i = len = strlen(tmpattr->value);
                        while (i > 0 &&  isspace(tmpattr->value[i-1]))
                              i--;
                        if (i < len) {
                              tmpattr->value[i] = '\0';
                              dbg("remove %i trailing whitespace chars from '%s'",
                                     len - i, tmpattr->value);
                        }
                  }
                  strlcat(string, tmpattr->value, maxsize);
                  dbg("substitute sysfs value '%s'", tmpattr->value);
                  break;
            case '%':
                  strlcat(string, "%", maxsize);
                  pos++;
                  break;
            case 'e':
                  next_free_number = find_free_number(udev, string);
                  if (next_free_number > 0) {
                        sprintf(temp2, "%d", next_free_number);
                        strlcat(string, temp2, maxsize);
                  }
                  break;
            case 'P':
                  if (!class_dev)
                        break;
                  class_dev_parent = sysfs_get_classdev_parent(class_dev);
                  if (class_dev_parent != NULL) {
                        struct udevice udev_parent;

                        dbg("found parent '%s', get the node name", class_dev_parent->path);
                        udev_init_device(&udev_parent, NULL, NULL);
                        /* lookup the name in the udev_db with the DEVPATH of the parent */
                        if (udev_db_get_device(&udev_parent, &class_dev_parent->path[strlen(sysfs_path)]) == 0) {
                              strlcat(string, udev_parent.name, maxsize);
                              dbg("substitute parent node name'%s'", udev_parent.name);
                        } else
                              dbg("parent not found in database");
                        udev_cleanup_device(&udev_parent);
                  }
                  break;
            case 'N':
                  if (udev->tmp_node[0] == '\0') {
                        dbg("create temporary device node for callout");
                        snprintf(udev->tmp_node, sizeof(udev->tmp_node), "%s/.tmp-%u-%u",
                               udev_root, major(udev->devt), minor(udev->devt));
                        udev->tmp_node[sizeof(udev->tmp_node)-1] = '\0';
                        udev_make_node(udev, udev->tmp_node, udev->devt, 0600, 0, 0);
                  }
                  strlcat(string, udev->tmp_node, maxsize);
                  dbg("substitute temporary device node name '%s'", udev->tmp_node);
                  break;
            case 'r':
                  strlcat(string, udev_root, maxsize);
                  dbg("substitute udev_root '%s'", udev_root);
                  break;
            default:
                  dbg("unknown substitution type '%%%c'", c);
                  break;
            }
            /* truncate to specified length */
            if (len > 0)
                  pos[len] = '\0';

            strlcat(string, tail, maxsize);
      }
}

static int execute_program(struct udevice *udev, const char *path, char *value, int len)
{
      int retval;
      int count;
      int status;
      int fds[2];
      pid_t pid;
      char *pos;
      char arg[PATH_SIZE];
      char *argv[(sizeof(arg) / 2) + 1];
      int i;

      strlcpy(arg, path, sizeof(arg));
      i = 0;
      if (strchr(path, ' ')) {
            pos = arg;
            while (pos != NULL) {
                  if (pos[0] == '\'') {
                        /* don't separate if in apostrophes */
                        pos++;
                        argv[i] = strsep(&pos, "\'");
                        while (pos && pos[0] == ' ')
                              pos++;
                  } else {
                        argv[i] = strsep(&pos, " ");
                  }
                  dbg("arg[%i] '%s'", i, argv[i]);
                  i++;
            }
            argv[i] =  NULL;
            dbg("execute '%s' with parsed arguments", arg);
      } else {
            argv[0] = arg;
            argv[1] = udev->subsystem;
            argv[2] = NULL;
            dbg("execute '%s' with subsystem '%s' argument", arg, argv[1]);
      }

      retval = pipe(fds);
      if (retval != 0) {
            dbg("pipe failed");
            return -1;
      }

      pid = fork();
      switch(pid) {
      case 0:
            /* child */
            /* dup2 write side of pipe to STDOUT */
            dup2(fds[1], STDOUT_FILENO);
            retval = execv(arg, argv);

            info(KEY_PROGRAM " execution of '%s' failed", path);
            exit(1);
      case -1:
            dbg("fork failed");
            return -1;
      default:
            /* parent reads from fds[0] */
            close(fds[1]);
            retval = 0;
            i = 0;
            while (1) {
                  count = read(fds[0], value + i, len - i-1);
                  if (count <= 0)
                        break;

                  i += count;
                  if (i >= len-1) {
                        dbg("result len %d too short", len);
                        retval = -1;
                        break;
                  }
            }

            if (count < 0) {
                  dbg("read failed with '%s'", strerror(errno));
                  retval = -1;
            }

            if (i > 0 && value[i-1] == '\n')
                  i--;
            value[i] = '\0';
            dbg("result is '%s'", value);

            close(fds[0]);
            waitpid(pid, &status, 0);

            if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
                  dbg("exec program status 0x%x", status);
                  retval = -1;
            }
      }
      return retval;
}

static struct sysfs_attribute *find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, char *attr)
{
      struct sysfs_attribute *tmpattr = NULL;
      char *c;

      dbg("look for device attribute '%s'", attr);
      /* try to find the attribute in the class device directory */
      tmpattr = sysfs_get_classdev_attr(class_dev, attr);
      if (tmpattr)
            goto attr_found;

      /* look in the class device directory if present */
      if (sysfs_device) {
            tmpattr = sysfs_get_device_attr(sysfs_device, attr);
            if (tmpattr)
                  goto attr_found;
      }

      return NULL;

attr_found:
      c = strchr(tmpattr->value, '\n');
      if (c != NULL)
            c[0] = '\0';

      dbg("found attribute '%s'", tmpattr->path);
      return tmpattr;
}

static int compare_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, struct key_pair *pair)
{
      struct sysfs_attribute *tmpattr;
      int i;
      int len;

      if ((pair == NULL) || (pair->name[0] == '\0') || (pair->value == '\0'))
            return -ENODEV;

      tmpattr = find_sysfs_attribute(class_dev, sysfs_device, pair->name);
      if (tmpattr == NULL)
            return -ENODEV;

      /* strip trailing whitespace of value, if not asked to match for it */
      if (! isspace(pair->value[strlen(pair->value)-1])) {
            i = len = strlen(tmpattr->value);
            while (i > 0 &&  isspace(tmpattr->value[i-1]))
                  i--;
            if (i < len) {
                  tmpattr->value[i] = '\0';
                  dbg("remove %i trailing whitespace chars from '%s'",
                      len - i, tmpattr->value);
            }
      }

      dbg("compare attribute '%s' value '%s' with '%s'",
              pair->name, tmpattr->value, pair->value);
      if (strcmp_pattern(pair->value, tmpattr->value) != 0)
            return -ENODEV;

      dbg("found matching attribute '%s' with value '%s'",
          pair->name, pair->value);
      return 0;
}

static int match_rule(struct udevice *udev, struct udev_rule *rule,
                  struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
{
      if (rule->kernel[0] != '\0') {
            dbg("check for " KEY_KERNEL " rule->kernel='%s' class_dev->name='%s'",
                rule->kernel, class_dev->name);
            if (strcmp_pattern(rule->kernel, class_dev->name) != 0) {
                  dbg(KEY_KERNEL " is not matching");
                  if (rule->kernel_operation != KEY_OP_NOMATCH)
                        goto exit;
            } else {
                  dbg(KEY_KERNEL " matches");
                  if (rule->kernel_operation == KEY_OP_NOMATCH)
                        goto exit;
            }
            dbg(KEY_KERNEL " key is true");
      }

      if (rule->subsystem[0] != '\0') {
            dbg("check for " KEY_SUBSYSTEM " rule->subsystem='%s' class_dev->name='%s'",
                rule->subsystem, class_dev->name);
            if (strcmp_pattern(rule->subsystem, udev->subsystem) != 0) {
                  dbg(KEY_SUBSYSTEM " is not matching");
                  if (rule->subsystem_operation != KEY_OP_NOMATCH)
                        goto exit;
            } else {
                  dbg(KEY_SUBSYSTEM " matches");
                  if (rule->subsystem_operation == KEY_OP_NOMATCH)
                        goto exit;
            }
            dbg(KEY_SUBSYSTEM " key is true");
      }

      if (rule->env_pair_count) {
            int i;

            dbg("check for " KEY_ENV " pairs");
            for (i = 0; i < rule->env_pair_count; i++) {
                  struct key_pair *pair;
                  const char *value;

                  pair = &rule->env_pair[i];
                  value = getenv(pair->name);
                  if (!value) {
                        dbg(KEY_ENV "{'%s'} is not found", pair->name);
                        goto exit;
                  }
                  if (strcmp_pattern(pair->value, value) != 0) {
                        dbg(KEY_ENV "{'%s'} is not matching", pair->name);
                        if (pair->operation != KEY_OP_NOMATCH)
                              goto exit;
                  } else {
                        dbg(KEY_ENV "{'%s'} matches", pair->name);
                        if (pair->operation == KEY_OP_NOMATCH)
                              goto exit;
                  }
            }
            dbg(KEY_ENV " key is true");
      }

      /* walk up the chain of physical devices and find a match */
      while (1) {
            /* check for matching driver */
            if (rule->driver[0] != '\0') {
                  if (sysfs_device == NULL) {
                        dbg("device has no sysfs_device");
                        goto exit;
                  }
                  dbg("check for " KEY_DRIVER " rule->driver='%s' sysfs_device->driver_name='%s'",
                      rule->driver, sysfs_device->driver_name);
                  if (strcmp_pattern(rule->driver, sysfs_device->driver_name) != 0) {
                        dbg(KEY_DRIVER " is not matching");
                        if (rule->driver_operation != KEY_OP_NOMATCH)
                              goto try_parent;
                  } else {
                        dbg(KEY_DRIVER " matches");
                        if (rule->driver_operation == KEY_OP_NOMATCH)
                              goto try_parent;
                  }
                  dbg(KEY_DRIVER " key is true");
            }

            /* check for matching bus value */
            if (rule->bus[0] != '\0') {
                  if (sysfs_device == NULL) {
                        dbg("device has no sysfs_device");
                        goto exit;
                  }
                  dbg("check for " KEY_BUS " rule->bus='%s' sysfs_device->bus='%s'",
                      rule->bus, sysfs_device->bus);
                  if (strcmp_pattern(rule->bus, sysfs_device->bus) != 0) {
                        dbg(KEY_BUS " is not matching");
                        if (rule->bus_operation != KEY_OP_NOMATCH)
                              goto try_parent;
                  } else {
                        dbg(KEY_BUS " matches");
                        if (rule->bus_operation == KEY_OP_NOMATCH)
                              goto try_parent;
                  }
                  dbg(KEY_BUS " key is true");
            }

            /* check for matching bus id */
            if (rule->id[0] != '\0') {
                  if (sysfs_device == NULL) {
                        dbg("device has no sysfs_device");
                        goto exit;
                  }
                  dbg("check " KEY_ID);
                  if (strcmp_pattern(rule->id, sysfs_device->bus_id) != 0) {
                        dbg(KEY_ID " is not matching");
                        if (rule->id_operation != KEY_OP_NOMATCH)
                              goto try_parent;
                  } else {
                        dbg(KEY_ID " matches");
                        if (rule->id_operation == KEY_OP_NOMATCH)
                              goto try_parent;
                  }
                  dbg(KEY_ID " key is true");
            }

            /* check for matching sysfs pairs */
            if (rule->sysfs_pair_count) {
                  int i;

                  dbg("check " KEY_SYSFS " pairs");
                  for (i = 0; i < rule->sysfs_pair_count; i++) {
                        struct key_pair *pair;

                        pair = &rule->sysfs_pair[i];
                        if (compare_sysfs_attribute(class_dev, sysfs_device, pair) != 0) {
                              dbg(KEY_SYSFS "{'%s'} is not matching", pair->name);
                              if (pair->operation != KEY_OP_NOMATCH)
                                    goto try_parent;
                        } else {
                              dbg(KEY_SYSFS "{'%s'} matches", pair->name);
                              if (pair->operation == KEY_OP_NOMATCH)
                                    goto try_parent;
                        }
                  }
                  dbg(KEY_SYSFS " keys are true");
            }

            /* found matching physical device  */
            break;
try_parent:
            dbg("try parent sysfs device");
            sysfs_device = sysfs_get_device_parent(sysfs_device);
            if (sysfs_device == NULL)
                  goto exit;
            dbg("look at sysfs_device->path='%s'", sysfs_device->path);
            dbg("look at sysfs_device->bus_id='%s'", sysfs_device->bus_id);
      }

      /* execute external program */
      if (rule->program[0] != '\0') {
            char program[PATH_SIZE];

            dbg("check " KEY_PROGRAM);
            strlcpy(program, rule->program, sizeof(program));
            apply_format(udev, program, sizeof(program), class_dev, sysfs_device);
            if (execute_program(udev, program, udev->program_result, sizeof(udev->program_result)) != 0) {
                  dbg(KEY_PROGRAM " returned nonzero");
                  if (rule->program_operation != KEY_OP_NOMATCH)
                        goto exit;
            } else {
                  dbg(KEY_PROGRAM " returned successful");
                  if (rule->program_operation == KEY_OP_NOMATCH)
                        goto exit;
            }
            dbg(KEY_PROGRAM " key is true");
      }

      /* check for matching result of external program */
      if (rule->result[0] != '\0') {
            dbg("check for " KEY_RESULT " rule->result='%s', udev->program_result='%s'",
               rule->result, udev->program_result);
            if (strcmp_pattern(rule->result, udev->program_result) != 0) {
                  dbg(KEY_RESULT " is not matching");
                  if (rule->result_operation != KEY_OP_NOMATCH)
                        goto exit;
            } else {
                  dbg(KEY_RESULT " matches");
                  if (rule->result_operation == KEY_OP_NOMATCH)
                        goto exit;
            }
            dbg(KEY_RESULT " key is true");
      }

      /* rule matches */
      return 0;

exit:
      return -1;
}

int udev_rules_get_name(struct udevice *udev, struct sysfs_class_device *class_dev)
{
      struct sysfs_class_device *class_dev_parent;
      struct sysfs_device *sysfs_device = NULL;
      struct udev_rule *rule;

      dbg("class_dev->name='%s'", class_dev->name);

      /* Figure out where the "device"-symlink is at.  For char devices this will
       * always be in the class_dev->path.  On block devices, only the main block
       * device will have the device symlink in it's path. All partition devices
       * need to look at the symlink in its parent directory.
       */
      class_dev_parent = sysfs_get_classdev_parent(class_dev);
      if (class_dev_parent != NULL) {
            dbg("given class device has a parent, use this instead");
            sysfs_device = sysfs_get_classdev_device(class_dev_parent);
      } else {
            sysfs_device = sysfs_get_classdev_device(class_dev);
      }

      if (sysfs_device) {
            dbg("found devices device: path='%s', bus_id='%s', bus='%s'",
                sysfs_device->path, sysfs_device->bus_id, sysfs_device->bus);
            strlcpy(udev->bus_id, sysfs_device->bus_id, sizeof(udev->bus_id));
      }

      dbg("udev->kernel_name='%s'", udev->kernel_name);

      /* look for a matching rule to apply */
      list_for_each_entry(rule, &udev_rule_list, node) {
            dbg("process rule");
            if (match_rule(udev, rule, class_dev, sysfs_device) == 0) {

                  /* apply options */
                  if (rule->ignore_device) {
                        info("configured rule in '%s[%i]' applied, '%s' is ignored",
                             rule->config_file, rule->config_line, udev->kernel_name);
                        return -1;
                  }
                  if (rule->ignore_remove) {
                        udev->ignore_remove = 1;
                        dbg("remove event should be ignored");
                  }
                  /* apply all_partitions option only at a main block device */
                  if (rule->partitions && udev->type == DEV_BLOCK && udev->kernel_number[0] == '\0') {
                        udev->partitions = rule->partitions;
                        dbg("creation of partition nodes requested");
                  }

                  /* apply permissions */
                  if (rule->mode != 0000) {
                        udev->mode = rule->mode;
                        dbg("applied mode=%#o to '%s'", udev->mode, udev->kernel_name);
                  }
                  if (rule->owner[0] != '\0') {
                        strlcpy(udev->owner, rule->owner, sizeof(udev->owner));
                        apply_format(udev, udev->owner, sizeof(udev->owner), class_dev, sysfs_device);
                        dbg("applied owner='%s' to '%s'", udev->owner, udev->kernel_name);
                  }
                  if (rule->group[0] != '\0') {
                        strlcpy(udev->group, rule->group, sizeof(udev->group));
                        apply_format(udev, udev->group, sizeof(udev->group), class_dev, sysfs_device);
                        dbg("applied group='%s' to '%s'", udev->group, udev->kernel_name);
                  }

                  /* collect symlinks */
                  if (rule->symlink[0] != '\0') {
                        char temp[PATH_SIZE];
                        char *pos, *next;

                        info("configured rule in '%s[%i]' applied, added symlink '%s'",
                             rule->config_file, rule->config_line, rule->symlink);
                        strlcpy(temp, rule->symlink, sizeof(temp));
                        apply_format(udev, temp, sizeof(temp), class_dev, sysfs_device);

                        /* add multiple symlinks separated by spaces */
                        pos = temp;
                        next = strchr(temp, ' ');
                        while (next) {
                              next[0] = '\0';
                              dbg("add symlink '%s'", pos);
                              name_list_add(&udev->symlink_list, pos, 0);
                              pos = &next[1];
                              next = strchr(pos, ' ');
                        }
                        dbg("add symlink '%s'", pos);
                        name_list_add(&udev->symlink_list, pos, 0);
                  }

                  /* rule matches */
                  if (rule->name[0] != '\0') {
                        info("configured rule in '%s[%i]' applied, '%s' becomes '%s'",
                             rule->config_file, rule->config_line, udev->kernel_name, rule->name);

                        strlcpy(udev->name, rule->name, sizeof(udev->name));
                        apply_format(udev, udev->name, sizeof(udev->name), class_dev, sysfs_device);
                        strlcpy(udev->config_file, rule->config_file, sizeof(udev->config_file));
                        udev->config_line = rule->config_line;

                        if (udev->type != DEV_NET)
                              dbg("name, '%s' is going to have owner='%s', group='%s', mode=%#o partitions=%i",
                                  udev->name, udev->owner, udev->group, udev->mode, udev->partitions);

                        break;
                  }

                  if (rule->last_rule) {
                        dbg("last rule to be applied");
                        break;
                  }

            }
      }

      if (udev->name[0] == '\0') {
            /* no rule matched, so we use the kernel name */
            strlcpy(udev->name, udev->kernel_name, sizeof(udev->name));
            dbg("no rule found, use kernel name '%s'", udev->name);
      }

      if (udev->tmp_node[0] != '\0') {
            dbg("removing temporary device node");
            unlink_secure(udev->tmp_node);
            udev->tmp_node[0] = '\0';
      }

      return 0;
}

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