udev_utils.c

   1 /*
   2  * udev_utils.c - generic stuff used by udev
   3  *
   4  * Copyright (C) 2004-2005 Kay Sievers <kay.sievers@vrfy.org>
   5  *
   6  *      This program is free software; you can redistribute it and/or modify it
   7  *      under the terms of the GNU General Public License as published by the
   8  *      Free Software Foundation version 2 of the License.
   9  *
  10  *      This program is distributed in the hope that it will be useful, but
  11  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  *      General Public License for more details.
  14  *
  15  *      You should have received a copy of the GNU General Public License along
  16  *      with this program; if not, write to the Free Software Foundation, Inc.,
  17  *      675 Mass Ave, Cambridge, MA 02139, USA.
  18  *
  19  */
  20
  21
  22 #include <stdlib.h>
  23 #include <stdio.h>
  24 #include <stddef.h>
  25 #include <unistd.h>
  26 #include <fcntl.h>
  27 #include <errno.h>
  28 #include <ctype.h>
  29 #include <dirent.h>
  30 #include <syslog.h>
  31 #include <sys/utsname.h>
  32
  33 #include "udev_libc_wrapper.h"
  34 #include "udev.h"
  35 #include "logging.h"
  36 #include "udev_utils.h"
  37 #include "list.h"
  38
  39
  40 int log_priority(const char *priority)
  41 {
  42         char *endptr;
  43         int prio;
  44
  45         prio = strtol(priority, &endptr, 10);
  46         if (endptr[0] == '\0')
  47                 return prio;
  48         if (strncasecmp(priority, "err", 3) == 0)
  49                 return LOG_ERR;
  50         if (strcasecmp(priority, "info") == 0)
  51                 return LOG_INFO;
  52         if (strcasecmp(priority, "debug") == 0)
  53                 return LOG_DEBUG;
  54         if (string_is_true(priority))
  55                 return LOG_ERR;
  56
  57         return 0;
  58 }
  59
  60 int kernel_release_satisfactory(unsigned int version, unsigned int patchlevel, unsigned int sublevel)
  61 {
  62         static unsigned int kversion = 0;
  63         static unsigned int kpatchlevel;
  64         static unsigned int ksublevel;
  65
  66         if (kversion == 0) {
  67                 struct utsname uts;
  68                 if (uname(&uts) != 0)
  69                         return -1;
  70
  71                 if (sscanf (uts.release, "%u.%u.%u", &kversion, &kpatchlevel, &ksublevel) != 3) {
  72                         kversion = 0;
  73                         return -1;
  74                 }
  75         }
  76
  77         if (kversion >= version && kpatchlevel >= patchlevel && ksublevel >= sublevel)
  78                 return 1;
  79         else
  80                 return 0;
  81 }
  82
  83 int name_list_add(struct list_head *name_list, const char *name, int sort)
  84 {
  85         struct name_entry *loop_name;
  86         struct name_entry *new_name;
  87
  88         list_for_each_entry(loop_name, name_list, node) {
  89                 /* avoid doubles */
  90                 if (strcmp(loop_name->name, name) == 0) {
  91                         dbg("'%s' is already in the list", name);
  92                         return 0;
  93                 }
  94         }
  95
  96         if (sort)
  97                 list_for_each_entry(loop_name, name_list, node) {
  98                         if (sort && strcmp(loop_name->name, name) > 0)
  99                                 break;
 100                 }
 101
 102         new_name = malloc(sizeof(struct name_entry));
 103         if (new_name == NULL) {
 104                 dbg("error malloc");
 105                 return -ENOMEM;
 106         }
 107
 108         strlcpy(new_name->name, name, sizeof(new_name->name));
 109         dbg("adding '%s'", new_name->name);
 110         list_add_tail(&new_name->node, &loop_name->node);
 111
 112         return 0;
 113 }
 114
 115 int name_list_key_add(struct list_head *name_list, const char *key, const char *value)
 116 {
 117         struct name_entry *loop_name;
 118         struct name_entry *new_name;
 119
 120         list_for_each_entry(loop_name, name_list, node) {
 121                 if (strncmp(loop_name->name, key, strlen(key)) == 0) {
 122                         dbg("key already present '%s', replace it", loop_name->name);
 123                         snprintf(loop_name->name, sizeof(loop_name->name), "%s=%s", key, value);
 124                         loop_name->name[sizeof(loop_name->name)-1] = '\0';
 125                         return 0;
 126                 }
 127         }
 128
 129         new_name = malloc(sizeof(struct name_entry));
 130         if (new_name == NULL) {
 131                 dbg("error malloc");
 132                 return -ENOMEM;
 133         }
 134
 135         snprintf(new_name->name, sizeof(new_name->name), "%s=%s", key, value);
 136         new_name->name[sizeof(new_name->name)-1] = '\0';
 137         dbg("adding '%s'", new_name->name);
 138         list_add_tail(&new_name->node, &loop_name->node);
 139
 140         return 0;
 141 }
 142
 143 void name_list_cleanup(struct list_head *name_list)
 144 {
 145         struct name_entry *name_loop;
 146         struct name_entry *temp_loop;
 147
 148         list_for_each_entry_safe(name_loop, temp_loop, name_list, node) {
 149                 list_del(&name_loop->node);
 150                 free(name_loop);
 151         }
 152 }
 153
 154 /* calls function for every file found in specified directory */
 155 int add_matching_files(struct list_head *name_list, const char *dirname, const char *suffix)
 156 {
 157         struct dirent *ent;
 158         DIR *dir;
 159         char *ext;
 160         char filename[PATH_SIZE];
 161
 162         dbg("open directory '%s'", dirname);
 163         dir = opendir(dirname);
 164         if (dir == NULL) {
 165                 dbg("unable to open '%s'", dirname);
 166                 return -1;
 167         }
 168
 169         while (1) {
 170                 ent = readdir(dir);
 171                 if (ent == NULL || ent->d_name[0] == '\0')
 172                         break;
 173
 174                 if ((ent->d_name[0] == '.') || (ent->d_name[0] == COMMENT_CHARACTER))
 175                         continue;
 176
 177                 /* look for file matching with specified suffix */
 178                 ext = strrchr(ent->d_name, '.');
 179                 if (ext == NULL)
 180                         continue;
 181
 182                 if (strcmp(ext, suffix) != 0)
 183                         continue;
 184
 185                 dbg("put file '%s/%s' in list", dirname, ent->d_name);
 186
 187                 snprintf(filename, sizeof(filename), "%s/%s", dirname, ent->d_name);
 188                 filename[sizeof(filename)-1] = '\0';
 189                 name_list_add(name_list, filename, 1);
 190         }
 191
 192         closedir(dir);
 193         return 0;
 194 }