udev_rules.c

   1 /*
   2  * udev_rules.c
   3  *
   4  * Userspace devfs
   5  *
   6  * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
   7  * Copyright (C) 2003-2005 Kay Sievers <kay.sievers@vrfy.org>
   8  *
   9  *
  10  *      This program is free software; you can redistribute it and/or modify it
  11  *      under the terms of the GNU General Public License as published by the
  12  *      Free Software Foundation version 2 of the License.
  13  *
  14  *      This program is distributed in the hope that it will be useful, but
  15  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *      General Public License for more details.
  18  *
  19  *      You should have received a copy of the GNU General Public License along
  20  *      with this program; if not, write to the Free Software Foundation, Inc.,
  21  *      675 Mass Ave, Cambridge, MA 02139, USA.
  22  *
  23  */
  24
  25 #include <stddef.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <stdio.h>
  29 #include <fcntl.h>
  30 #include <ctype.h>
  31 #include <unistd.h>
  32 #include <errno.h>
  33 #include <sys/wait.h>
  34
  35 #include "libsysfs/sysfs/libsysfs.h"
  36 #include "list.h"
  37 #include "udev_libc_wrapper.h"
  38 #include "udev.h"
  39 #include "udev_utils.h"
  40 #include "udev_version.h"
  41 #include "logging.h"
  42 #include "udev_rules.h"
  43 #include "udev_db.h"
  44
  45
  46 /* compare string with pattern (supports * ? [0-9] [!A-Z]) */
  47 static int strcmp_pattern(const char *p, const char *s)
  48 {
  49         if (s[0] == '\0') {
  50                 while (p[0] == '*')
  51                         p++;
  52                 return (p[0] != '\0');
  53         }
  54         switch (p[0]) {
  55         case '[':
  56                 {
  57                         int not = 0;
  58                         p++;
  59                         if (p[0] == '!') {
  60                                 not = 1;
  61                                 p++;
  62                         }
  63                         while ((p[0] != '\0') && (p[0] != ']')) {
  64                                 int match = 0;
  65                                 if (p[1] == '-') {
  66                                         if ((s[0] >= p[0]) && (s[0] <= p[2]))
  67                                                 match = 1;
  68                                         p += 3;
  69                                 } else {
  70                                         match = (p[0] == s[0]);
  71                                         p++;
  72                                 }
  73                                 if (match ^ not) {
  74                                         while ((p[0] != '\0') && (p[0] != ']'))
  75                                                 p++;
  76                                         if (p[0] == ']')
  77                                                 return strcmp_pattern(p+1, s+1);
  78                                 }
  79                         }
  80                 }
  81                 break;
  82         case '*':
  83                 if (strcmp_pattern(p, s+1))
  84                         return strcmp_pattern(p+1, s);
  85                 return 0;
  86         case '\0':
  87                 if (s[0] == '\0') {
  88                         return 0;
  89                 }
  90                 break;
  91         default:
  92                 if ((p[0] == s[0]) || (p[0] == '?'))
  93                         return strcmp_pattern(p+1, s+1);
  94                 break;
  95         }
  96         return 1;
  97 }
  98
  99 /* extract possible {attr} and move str behind it */
 100 static char *get_format_attribute(char **str)
 101 {
 102         char *pos;
 103         char *attr = NULL;
 104
 105         if (*str[0] == '{') {
 106                 pos = strchr(*str, '}');
 107                 if (pos == NULL) {
 108                         err("missing closing brace for format");
 109                         return NULL;
 110                 }
 111                 pos[0] = '\0';
 112                 attr = *str+1;
 113                 *str = pos+1;
 114                 dbg("attribute='%s', str='%s'", attr, *str);
 115         }
 116         return attr;
 117 }
 118
 119 /* extract possible format length and move str behind it*/
 120 static int get_format_len(char **str)
 121 {
 122         int num;
 123         char *tail;
 124
 125         if (isdigit(*str[0])) {
 126                 num = (int) strtoul(*str, &tail, 10);
 127                 if (num > 0) {
 128                         *str = tail;
 129                         dbg("format length=%i", num);
 130                         return num;
 131                 } else {
 132                         err("format parsing error '%s'", *str);
 133                 }
 134         }
 135         return -1;
 136 }
 137
 138 /** Finds the lowest positive N such that <name>N isn't present in
 139  *  $(udevroot) either as a file or a symlink.
 140  *
 141  *  @param  name                Name to check for
 142  *  @return                     0 if <name> didn't exist and N otherwise.
 143  */
 144 static int find_free_number(struct udevice *udev, const char *name)
 145 {
 146         char devpath[PATH_SIZE];
 147         char filename[PATH_SIZE];
 148         int num = 0;
 149
 150         strlcpy(filename, name, sizeof(filename));
 151         while (1) {
 152                 dbg("look for existing node '%s'", filename);
 153                 if (udev_db_search_name(devpath, sizeof(devpath), filename) != 0) {
 154                         dbg("free num=%d", num);
 155                         return num;
 156                 }
 157
 158                 num++;
 159                 if (num > 1000) {
 160                         info("find_free_number gone crazy (num=%d), aborted", num);
 161                         return -1;
 162                 }
 163                 snprintf(filename, sizeof(filename), "%s%d", name, num);
 164                 filename[sizeof(filename)-1] = '\0';
 165         }
 166 }
 167
 168 static int find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device,
 169                                 const char *name, char *value, size_t len)
 170 {
 171         struct sysfs_attribute *tmpattr;
 172
 173         dbg("look for device attribute '%s'", name);
 174         if (class_dev) {
 175                 dbg("look for class attribute '%s/%s'", class_dev->path, name);
 176                 tmpattr = sysfs_get_classdev_attr(class_dev, name);
 177                 if (tmpattr)
 178                         goto attr_found;
 179         }
 180         if (sysfs_device) {
 181                 dbg("look for devices attribute '%s/%s'", sysfs_device->path, name);
 182                 tmpattr = sysfs_get_device_attr(sysfs_device, name);
 183                 if (tmpattr)
 184                         goto attr_found;
 185         }
 186         return -1;
 187
 188 attr_found:
 189         strlcpy(value, tmpattr->value, len);
 190         remove_trailing_char(value, '\n');
 191
 192         dbg("found attribute '%s'", tmpattr->path);
 193         return 0;
 194 }
 195
 196 static void apply_format(struct udevice *udev, char *string, size_t maxsize,
 197                          struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 198 {
 199         char temp[PATH_SIZE];
 200         char temp2[PATH_SIZE];
 201         char *head, *tail, *cpos, *attr, *rest;
 202         int len;
 203         int i;
 204         unsigned int next_free_number;
 205         struct sysfs_class_device *class_dev_parent;
 206         enum subst_type {
 207                 SUBST_UNKNOWN,
 208                 SUBST_DEVPATH,
 209                 SUBST_ID,
 210                 SUBST_KERNEL_NUMBER,
 211                 SUBST_KERNEL_NAME,
 212                 SUBST_MAJOR,
 213                 SUBST_MINOR,
 214                 SUBST_RESULT,
 215                 SUBST_SYSFS,
 216                 SUBST_ENUM,
 217                 SUBST_PARENT,
 218                 SUBST_TEMP_NODE,
 219                 SUBST_ROOT,
 220                 SUBST_MODALIAS,
 221         };
 222         static const struct subst_map {
 223                 char *name;
 224                 char fmt;
 225                 enum subst_type type;
 226         } map[] = {
 227                 { .name = "devpath",            .fmt = 'p',     .type = SUBST_DEVPATH },
 228                 { .name = "id",                 .fmt = 'b',     .type = SUBST_ID },
 229                 { .name = "number",             .fmt = 'n',     .type = SUBST_KERNEL_NUMBER },
 230                 { .name = "kernel",             .fmt = 'k',     .type = SUBST_KERNEL_NAME },
 231                 { .name = "major",              .fmt = 'M',     .type = SUBST_MAJOR },
 232                 { .name = "minor",              .fmt = 'm',     .type = SUBST_MINOR },
 233                 { .name = "result",             .fmt = 'c',     .type = SUBST_RESULT },
 234                 { .name = "sysfs",              .fmt = 's',     .type = SUBST_SYSFS },
 235                 { .name = "enum",               .fmt = 'e',     .type = SUBST_ENUM },
 236                 { .name = "parent",             .fmt = 'P',     .type = SUBST_PARENT },
 237                 { .name = "tempnode",           .fmt = 'N',     .type = SUBST_TEMP_NODE },
 238                 { .name = "root",               .fmt = 'r',     .type = SUBST_ROOT },
 239                 { .name = "modalias",           .fmt = 'A',     .type = SUBST_MODALIAS },
 240                 {}
 241         };
 242         enum subst_type type;
 243         const struct subst_map *subst;
 244
 245         head = string;
 246         while (1) {
 247                 len = -1;
 248                 while (head[0] != '\0') {
 249                         if (head[0] == '$') {
 250                                 /* substitute named variable */
 251                                 if (head[1] == '\0')
 252                                         break;
 253                                 if (head[1] == '$') {
 254                                         strlcpy(temp, head+2, sizeof(temp));
 255                                         strlcpy(head+1, temp, maxsize);
 256                                         head++;
 257                                         continue;
 258                                 }
 259                                 head[0] = '\0';
 260                                 for (subst = map; subst->name; subst++) {
 261                                         if (strncasecmp(&head[1], subst->name, strlen(subst->name)) == 0) {
 262                                                 type = subst->type;
 263                                                 tail = head + strlen(subst->name)+1;
 264                                                 dbg("will substitute format name '%s'", subst->name);
 265                                                 goto found;
 266                                         }
 267                                 }
 268                         }
 269                         else if (head[0] == '%') {
 270                                 /* substitute format char */
 271                                 if (head[1] == '\0')
 272                                         break;
 273                                 if (head[1] == '%') {
 274                                         strlcpy(temp, head+2, sizeof(temp));
 275                                         strlcpy(head+1, temp, maxsize);
 276                                         head++;
 277                                         continue;
 278                                 }
 279                                 head[0] = '\0';
 280                                 tail = head+1;
 281                                 len = get_format_len(&tail);
 282                                 for (subst = map; subst->name; subst++) {
 283                                         if (tail[0] == subst->fmt) {
 284                                                 type = subst->type;
 285                                                 tail++;
 286                                                 dbg("will substitute format char '%c'", subst->fmt);
 287                                                 goto found;
 288                                         }
 289                                 }
 290                         }
 291                         head++;
 292                 }
 293                 break;
 294 found:
 295                 attr = get_format_attribute(&tail);
 296                 strlcpy(temp, tail, sizeof(temp));
 297                 dbg("format=%i, string='%s', tail='%s', class_dev=%p, sysfs_dev=%p",
 298                     type ,string, tail, class_dev, sysfs_device);
 299
 300                 switch (type) {
 301                 case SUBST_DEVPATH:
 302                         strlcat(string, udev->devpath, maxsize);
 303                         dbg("substitute devpath '%s'", udev->devpath);
 304                         break;
 305                 case SUBST_ID:
 306                         strlcat(string, udev->bus_id, maxsize);
 307                         dbg("substitute bus_id '%s'", udev->bus_id);
 308                         break;
 309                 case SUBST_KERNEL_NAME:
 310                         strlcat(string, udev->kernel_name, maxsize);
 311                         dbg("substitute kernel name '%s'", udev->kernel_name);
 312                         break;
 313                 case SUBST_KERNEL_NUMBER:
 314                         strlcat(string, udev->kernel_number, maxsize);
 315                         dbg("substitute kernel number '%s'", udev->kernel_number);
 316                         break;
 317                 case SUBST_MAJOR:
 318                         sprintf(temp2, "%d", major(udev->devt));
 319                         strlcat(string, temp2, maxsize);
 320                         dbg("substitute major number '%s'", temp2);
 321                         break;
 322                 case SUBST_MINOR:
 323                         sprintf(temp2, "%d", minor(udev->devt));
 324                         strlcat(string, temp2, maxsize);
 325                         dbg("substitute minor number '%s'", temp2);
 326                         break;
 327                 case SUBST_RESULT:
 328                         if (udev->program_result[0] == '\0')
 329                                 break;
 330                         /* get part part of the result string */
 331                         i = 0;
 332                         if (attr != NULL)
 333                                 i = strtoul(attr, &rest, 10);
 334                         if (i > 0) {
 335                                 dbg("request part #%d of result string", i);
 336                                 cpos = udev->program_result;
 337                                 while (--i) {
 338                                         while (cpos[0] != '\0' && !isspace(cpos[0]))
 339                                                 cpos++;
 340                                         while (isspace(cpos[0]))
 341                                                 cpos++;
 342                                 }
 343                                 if (i > 0) {
 344                                         err("requested part of result string not found");
 345                                         break;
 346                                 }
 347                                 strlcpy(temp2, cpos, sizeof(temp2));
 348                                 /* %{2+}c copies the whole string from the second part on */
 349                                 if (rest[0] != '+') {
 350                                         cpos = strchr(temp2, ' ');
 351                                         if (cpos)
 352                                                 cpos[0] = '\0';
 353                                 }
 354                                 strlcat(string, temp2, maxsize);
 355                                 dbg("substitute part of result string '%s'", temp2);
 356                         } else {
 357                                 strlcat(string, udev->program_result, maxsize);
 358                                 dbg("substitute result string '%s'", udev->program_result);
 359                         }
 360                         break;
 361                 case SUBST_SYSFS:
 362                         if (attr == NULL) {
 363                                 dbg("missing attribute");
 364                                 break;
 365                         }
 366                         if (find_sysfs_attribute(class_dev, sysfs_device, attr, temp2, sizeof(temp2)) != 0) {
 367                                 struct sysfs_device *parent_device;
 368
 369                                 dbg("sysfs attribute '%s' not found, walk up the physical devices", attr);
 370                                 parent_device = sysfs_get_device_parent(sysfs_device);
 371                                 while (parent_device) {
 372                                         dbg("looking at '%s'", parent_device->path);
 373                                         if (find_sysfs_attribute(NULL, parent_device, attr, temp2, sizeof(temp2)) == 0)
 374                                                 break;
 375                                         parent_device = sysfs_get_device_parent(parent_device);
 376                                 }
 377                                 if (!parent_device)
 378                                         break;
 379                         }
 380                         /* strip trailing whitespace of sysfs value */
 381                         i = strlen(temp2);
 382                         while (i > 0 && isspace(temp2[i-1]))
 383                                 temp2[--i] = '\0';
 384                         replace_untrusted_chars(temp2);
 385                         strlcat(string, temp2, maxsize);
 386                         dbg("substitute sysfs value '%s'", temp2);
 387                         break;
 388                 case SUBST_ENUM:
 389                         next_free_number = find_free_number(udev, string);
 390                         if (next_free_number > 0) {
 391                                 sprintf(temp2, "%d", next_free_number);
 392                                 strlcat(string, temp2, maxsize);
 393                         }
 394                         break;
 395                 case SUBST_PARENT:
 396                         if (!class_dev)
 397                                 break;
 398                         class_dev_parent = sysfs_get_classdev_parent(class_dev);
 399                         if (class_dev_parent != NULL) {
 400                                 struct udevice udev_parent;
 401
 402                                 dbg("found parent '%s', get the node name", class_dev_parent->path);
 403                                 udev_init_device(&udev_parent, NULL, NULL, NULL);
 404                                 /* lookup the name in the udev_db with the DEVPATH of the parent */
 405                                 if (udev_db_get_device(&udev_parent, &class_dev_parent->path[strlen(sysfs_path)]) == 0) {
 406                                         strlcat(string, udev_parent.name, maxsize);
 407                                         dbg("substitute parent node name'%s'", udev_parent.name);
 408                                 } else
 409                                         dbg("parent not found in database");
 410                                 udev_cleanup_device(&udev_parent);
 411                         }
 412                         break;
 413                 case SUBST_TEMP_NODE:
 414                         if (udev->tmp_node[0] == '\0') {
 415                                 dbg("create temporary device node for callout");
 416                                 snprintf(udev->tmp_node, sizeof(udev->tmp_node), "%s/.tmp-%u-%u",
 417                                          udev_root, major(udev->devt), minor(udev->devt));
 418                                 udev->tmp_node[sizeof(udev->tmp_node)-1] = '\0';
 419                                 udev_make_node(udev, udev->tmp_node, udev->devt, 0600, 0, 0);
 420                         }
 421                         strlcat(string, udev->tmp_node, maxsize);
 422                         dbg("substitute temporary device node name '%s'", udev->tmp_node);
 423                         break;
 424                 case SUBST_ROOT:
 425                         strlcat(string, udev_root, maxsize);
 426                         dbg("substitute udev_root '%s'", udev_root);
 427                         break;
 428                 case SUBST_MODALIAS:
 429                         if (find_sysfs_attribute(NULL, sysfs_device, "modalias", temp2, sizeof(temp2)) != 0)
 430                                 break;
 431                         strlcat(string, temp2, maxsize);
 432                         dbg("substitute MODALIAS '%s'", temp2);
 433                         break;
 434                 default:
 435                         err("unknown substitution type=%i", type);
 436                         break;
 437                 }
 438                 /* possibly truncate to format-char specified length */
 439                 if (len != -1) {
 440                         head[len] = '\0';
 441                         dbg("truncate to %i chars, subtitution string becomes '%s'", len, head);
 442                 }
 443
 444                 strlcat(string, temp, maxsize);
 445         }
 446 }
 447
 448 static int execute_program_pipe(const char *command, const char *subsystem, char *value, int len)
 449 {
 450         int retval;
 451         int count;
 452         int status;
 453         int pipefds[2];
 454         pid_t pid;
 455         char *pos;
 456         char arg[PATH_SIZE];
 457         char *argv[(sizeof(arg) / 2) + 1];
 458         int devnull;
 459         int i;
 460
 461         strlcpy(arg, command, sizeof(arg));
 462         i = 0;
 463         if (strchr(arg, ' ')) {
 464                 pos = arg;
 465                 while (pos != NULL) {
 466                         if (pos[0] == '\'') {
 467                                 /* don't separate if in apostrophes */
 468                                 pos++;
 469                                 argv[i] = strsep(&pos, "\'");
 470                                 while (pos && pos[0] == ' ')
 471                                         pos++;
 472                         } else {
 473                                 argv[i] = strsep(&pos, " ");
 474                         }
 475                         dbg("arg[%i] '%s'", i, argv[i]);
 476                         i++;
 477                 }
 478                 argv[i] =  NULL;
 479                 dbg("execute '%s' with parsed arguments", arg);
 480         } else {
 481                 argv[0] = arg;
 482                 argv[1] = (char *) subsystem;
 483                 argv[2] = NULL;
 484                 dbg("execute '%s' with subsystem '%s' argument", arg, argv[1]);
 485         }
 486
 487         retval = pipe(pipefds);
 488         if (retval != 0) {
 489                 err("pipe failed");
 490                 return -1;
 491         }
 492
 493         pid = fork();
 494         switch(pid) {
 495         case 0:
 496                 /* child dup2 write side of pipe to STDOUT */
 497                 devnull = open("/dev/null", O_RDWR);
 498                 if (devnull >= 0) {
 499                         dup2(devnull, STDIN_FILENO);
 500                         dup2(devnull, STDERR_FILENO);
 501                         close(devnull);
 502                 }
 503                 dup2(pipefds[1], STDOUT_FILENO);
 504                 retval = execv(arg, argv);
 505                 err("exec of program failed");
 506                 _exit(1);
 507         case -1:
 508                 err("fork of '%s' failed", arg);
 509                 retval = -1;
 510                 break;
 511         default:
 512                 /* parent reads from pipefds[0] */
 513                 close(pipefds[1]);
 514                 retval = 0;
 515                 i = 0;
 516                 while (1) {
 517                         count = read(pipefds[0], value + i, len - i-1);
 518                         if (count < 0) {
 519                                 err("read failed with '%s'", strerror(errno));
 520                                 retval = -1;
 521                         }
 522
 523                         if (count == 0)
 524                                 break;
 525
 526                         i += count;
 527                         if (i >= len-1) {
 528                                 err("result len %d too short", len);
 529                                 retval = -1;
 530                                 break;
 531                         }
 532                 }
 533                 value[i] = '\0';
 534
 535                 close(pipefds[0]);
 536                 waitpid(pid, &status, 0);
 537
 538                 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
 539                         dbg("exec program status 0x%x", status);
 540                         retval = -1;
 541                 }
 542         }
 543
 544         if (!retval) {
 545                 remove_trailing_char(value, '\n');
 546                 dbg("result is '%s'", value);
 547                 replace_untrusted_chars(value);
 548         } else
 549                 value[0] = '\0';
 550
 551         return retval;
 552 }
 553
 554 static int match_rule(struct udevice *udev, struct udev_rule *rule,
 555                       struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 556 {
 557         struct sysfs_device *parent_device = sysfs_device;
 558
 559         if (rule->action_operation != KEY_OP_UNSET) {
 560                 dbg("check for " KEY_ACTION " rule->action='%s' udev->action='%s'",
 561                     rule->action, udev->action);
 562                 if (strcmp_pattern(rule->action, udev->action) != 0) {
 563                         dbg(KEY_ACTION " is not matching");
 564                         if (rule->action_operation != KEY_OP_NOMATCH)
 565                                 goto exit;
 566                 } else {
 567                         dbg(KEY_ACTION " matches");
 568                         if (rule->action_operation == KEY_OP_NOMATCH)
 569                                 goto exit;
 570                 }
 571                 dbg(KEY_ACTION " key is true");
 572         }
 573
 574         if (rule->kernel_operation != KEY_OP_UNSET) {
 575                 dbg("check for " KEY_KERNEL " rule->kernel='%s' udev_kernel_name='%s'",
 576                     rule->kernel, udev->kernel_name);
 577                 if (strcmp_pattern(rule->kernel, udev->kernel_name) != 0) {
 578                         dbg(KEY_KERNEL " is not matching");
 579                         if (rule->kernel_operation != KEY_OP_NOMATCH)
 580                                 goto exit;
 581                 } else {
 582                         dbg(KEY_KERNEL " matches");
 583                         if (rule->kernel_operation == KEY_OP_NOMATCH)
 584                                 goto exit;
 585                 }
 586                 dbg(KEY_KERNEL " key is true");
 587         }
 588
 589         if (rule->subsystem_operation != KEY_OP_UNSET) {
 590                 dbg("check for " KEY_SUBSYSTEM " rule->subsystem='%s' udev->subsystem='%s'",
 591                     rule->subsystem, udev->subsystem);
 592                 if (strcmp_pattern(rule->subsystem, udev->subsystem) != 0) {
 593                         dbg(KEY_SUBSYSTEM " is not matching");
 594                         if (rule->subsystem_operation != KEY_OP_NOMATCH)
 595                                 goto exit;
 596                 } else {
 597                         dbg(KEY_SUBSYSTEM " matches");
 598                         if (rule->subsystem_operation == KEY_OP_NOMATCH)
 599                                 goto exit;
 600                 }
 601                 dbg(KEY_SUBSYSTEM " key is true");
 602         }
 603
 604         if (rule->devpath_operation != KEY_OP_UNSET) {
 605                 dbg("check for " KEY_DEVPATH " rule->devpath='%s' udev->devpath='%s'",
 606                     rule->devpath, udev->devpath);
 607                 if (strcmp_pattern(rule->devpath, udev->devpath) != 0) {
 608                         dbg(KEY_DEVPATH " is not matching");
 609                         if (rule->devpath_operation != KEY_OP_NOMATCH)
 610                                 goto exit;
 611                 } else {
 612                         dbg(KEY_DEVPATH " matches");
 613                         if (rule->devpath_operation == KEY_OP_NOMATCH)
 614                                 goto exit;
 615                 }
 616                 dbg(KEY_DEVPATH " key is true");
 617         }
 618
 619         if (rule->modalias_operation != KEY_OP_UNSET) {
 620                 char value[NAME_SIZE];
 621
 622                 if (find_sysfs_attribute(NULL, sysfs_device, "modalias", value, sizeof(value)) != 0) {
 623                         dbg(KEY_MODALIAS " value not found");
 624                         goto exit;
 625                 }
 626                 dbg("check for " KEY_MODALIAS " rule->modalias='%s' modalias='%s'",
 627                     rule->modalias, value);
 628                 if (strcmp_pattern(rule->modalias, value) != 0) {
 629                         dbg(KEY_MODALIAS " is not matching");
 630                         if (rule->modalias_operation != KEY_OP_NOMATCH)
 631                                 goto exit;
 632                 } else {
 633                         dbg(KEY_MODALIAS " matches");
 634                         if (rule->modalias_operation == KEY_OP_NOMATCH)
 635                                 goto exit;
 636                 }
 637                 dbg(KEY_MODALIAS " key is true");
 638         }
 639
 640         if (rule->env_pair_count) {
 641                 int i;
 642
 643                 dbg("check for " KEY_ENV " pairs");
 644                 for (i = 0; i < rule->env_pair_count; i++) {
 645                         struct key_pair *pair;
 646                         const char *value;
 647
 648                         pair = &rule->env_pair[i];
 649                         value = getenv(pair->name);
 650                         if (!value) {
 651                                 dbg(KEY_ENV "{'%s'} is not found", pair->name);
 652                                 goto exit;
 653                         }
 654                         if (strcmp_pattern(pair->value, value) != 0) {
 655                                 dbg(KEY_ENV "{'%s'} is not matching", pair->name);
 656                                 if (pair->operation != KEY_OP_NOMATCH)
 657                                         goto exit;
 658                         } else {
 659                                 dbg(KEY_ENV "{'%s'} matches", pair->name);
 660                                 if (pair->operation == KEY_OP_NOMATCH)
 661                                         goto exit;
 662                         }
 663                 }
 664                 dbg(KEY_ENV " key is true");
 665         }
 666
 667         /* walk up the chain of physical devices and find a match */
 668         while (1) {
 669                 /* check for matching driver */
 670                 if (rule->driver_operation != KEY_OP_UNSET) {
 671                         if (parent_device == NULL) {
 672                                 dbg("device has no sysfs_device");
 673                                 goto exit;
 674                         }
 675                         dbg("check for " KEY_DRIVER " rule->driver='%s' sysfs_device->driver_name='%s'",
 676                             rule->driver, parent_device->driver_name);
 677                         if (strcmp_pattern(rule->driver, parent_device->driver_name) != 0) {
 678                                 dbg(KEY_DRIVER " is not matching");
 679                                 if (rule->driver_operation != KEY_OP_NOMATCH)
 680                                         goto try_parent;
 681                         } else {
 682                                 dbg(KEY_DRIVER " matches");
 683                                 if (rule->driver_operation == KEY_OP_NOMATCH)
 684                                         goto try_parent;
 685                         }
 686                         dbg(KEY_DRIVER " key is true");
 687                 }
 688
 689                 /* check for matching bus value */
 690                 if (rule->bus_operation != KEY_OP_UNSET) {
 691                         if (parent_device == NULL) {
 692                                 dbg("device has no sysfs_device");
 693                                 goto exit;
 694                         }
 695                         dbg("check for " KEY_BUS " rule->bus='%s' sysfs_device->bus='%s'",
 696                             rule->bus, parent_device->bus);
 697                         if (strcmp_pattern(rule->bus, parent_device->bus) != 0) {
 698                                 dbg(KEY_BUS " is not matching");
 699                                 if (rule->bus_operation != KEY_OP_NOMATCH)
 700                                         goto try_parent;
 701                         } else {
 702                                 dbg(KEY_BUS " matches");
 703                                 if (rule->bus_operation == KEY_OP_NOMATCH)
 704                                         goto try_parent;
 705                         }
 706                         dbg(KEY_BUS " key is true");
 707                 }
 708
 709                 /* check for matching bus id */
 710                 if (rule->id_operation != KEY_OP_UNSET) {
 711                         if (parent_device == NULL) {
 712                                 dbg("device has no sysfs_device");
 713                                 goto exit;
 714                         }
 715                         dbg("check " KEY_ID);
 716                         if (strcmp_pattern(rule->id, parent_device->bus_id) != 0) {
 717                                 dbg(KEY_ID " is not matching");
 718                                 if (rule->id_operation != KEY_OP_NOMATCH)
 719                                         goto try_parent;
 720                         } else {
 721                                 dbg(KEY_ID " matches");
 722                                 if (rule->id_operation == KEY_OP_NOMATCH)
 723                                         goto try_parent;
 724                         }
 725                         dbg(KEY_ID " key is true");
 726                 }
 727
 728                 /* check for matching sysfs pairs */
 729                 if (rule->sysfs_pair_count) {
 730                         int i;
 731
 732                         dbg("check " KEY_SYSFS " pairs");
 733                         for (i = 0; i < rule->sysfs_pair_count; i++) {
 734                                 struct key_pair *pair;
 735                                 char value[VALUE_SIZE];
 736                                 size_t len;
 737
 738                                 pair = &rule->sysfs_pair[i];
 739                                 if (find_sysfs_attribute(class_dev, parent_device, pair->name, value, sizeof(value)) != 0)
 740                                         goto try_parent;
 741
 742                                 /* strip trailing whitespace of value, if not asked to match for it */
 743                                 len = strlen(pair->value);
 744                                 if (len && !isspace(pair->value[len-1])) {
 745                                         len = strlen(value);
 746                                         while (len > 0 && isspace(value[len-1]))
 747                                                 value[--len] = '\0';
 748                                         dbg("removed %i trailing whitespace chars from '%s'", strlen(value)-len, value);
 749                                 }
 750
 751                                 dbg("compare attribute '%s' value '%s' with '%s'", pair->name, value, pair->value);
 752                                 if (strcmp_pattern(pair->value, value) != 0) {
 753                                         dbg(KEY_SYSFS "{'%s'} is not matching", pair->name);
 754                                         if (pair->operation != KEY_OP_NOMATCH)
 755                                                 goto try_parent;
 756                                 } else {
 757                                         dbg(KEY_SYSFS "{'%s'} matches", pair->name);
 758                                         if (pair->operation == KEY_OP_NOMATCH)
 759                                                 goto try_parent;
 760                                 }
 761                         }
 762                         dbg(KEY_SYSFS " keys are true");
 763                 }
 764
 765                 /* found matching physical device  */
 766                 break;
 767 try_parent:
 768                 dbg("try parent sysfs device");
 769                 parent_device = sysfs_get_device_parent(parent_device);
 770                 if (parent_device == NULL)
 771                         goto exit;
 772                 dbg("look at sysfs_device->path='%s'", parent_device->path);
 773                 dbg("look at sysfs_device->bus_id='%s'", parent_device->bus_id);
 774         }
 775
 776         /* execute external program */
 777         if (rule->program_operation != KEY_OP_UNSET) {
 778                 char program[PATH_SIZE];
 779
 780                 dbg("check " KEY_PROGRAM);
 781                 strlcpy(program, rule->program, sizeof(program));
 782                 apply_format(udev, program, sizeof(program), class_dev, sysfs_device);
 783                 if (execute_program_pipe(program, udev->subsystem,
 784                                          udev->program_result, sizeof(udev->program_result)) != 0) {
 785                         dbg(KEY_PROGRAM " returned nonzero");
 786                         if (rule->program_operation != KEY_OP_NOMATCH)
 787                                 goto exit;
 788                 } else {
 789                         dbg(KEY_PROGRAM " returned successful");
 790                         if (rule->program_operation == KEY_OP_NOMATCH)
 791                                 goto exit;
 792                 }
 793                 dbg(KEY_PROGRAM " key is true");
 794         }
 795
 796         /* check for matching result of external program */
 797         if (rule->result_operation != KEY_OP_UNSET) {
 798                 dbg("check for " KEY_RESULT " rule->result='%s', udev->program_result='%s'",
 799                    rule->result, udev->program_result);
 800                 if (strcmp_pattern(rule->result, udev->program_result) != 0) {
 801                         dbg(KEY_RESULT " is not matching");
 802                         if (rule->result_operation != KEY_OP_NOMATCH)
 803                                 goto exit;
 804                 } else {
 805                         dbg(KEY_RESULT " matches");
 806                         if (rule->result_operation == KEY_OP_NOMATCH)
 807                                 goto exit;
 808                 }
 809                 dbg(KEY_RESULT " key is true");
 810         }
 811
 812         /* rule matches */
 813         return 0;
 814
 815 exit:
 816         return -1;
 817 }
 818
 819 int udev_rules_get_name(struct udevice *udev, struct sysfs_class_device *class_dev)
 820 {
 821         struct sysfs_class_device *class_dev_parent;
 822         struct sysfs_device *sysfs_device = NULL;
 823         struct udev_rule *rule;
 824
 825         dbg("class_dev->name='%s'", class_dev->name);
 826
 827         /* Figure out where the "device"-symlink is at.  For char devices this will
 828          * always be in the class_dev->path.  On block devices, only the main block
 829          * device will have the device symlink in it's path. All partition devices
 830          * need to look at the symlink in its parent directory.
 831          */
 832         class_dev_parent = sysfs_get_classdev_parent(class_dev);
 833         if (class_dev_parent != NULL) {
 834                 dbg("given class device has a parent, use this instead");
 835                 sysfs_device = sysfs_get_classdev_device(class_dev_parent);
 836         } else {
 837                 sysfs_device = sysfs_get_classdev_device(class_dev);
 838         }
 839
 840         if (sysfs_device) {
 841                 dbg("found devices device: path='%s', bus_id='%s', bus='%s'",
 842                     sysfs_device->path, sysfs_device->bus_id, sysfs_device->bus);
 843                 strlcpy(udev->bus_id, sysfs_device->bus_id, sizeof(udev->bus_id));
 844         }
 845
 846         dbg("udev->kernel_name='%s'", udev->kernel_name);
 847
 848         /* look for a matching rule to apply */
 849         list_for_each_entry(rule, &udev_rule_list, node) {
 850                 if (udev->name_set && rule->name_operation != KEY_OP_UNSET) {
 851                         dbg("node name already set, rule ignored");
 852                         continue;
 853                 }
 854
 855                 dbg("process rule");
 856                 if (match_rule(udev, rule, class_dev, sysfs_device) == 0) {
 857                         /* apply options */
 858                         if (rule->ignore_device) {
 859                                 info("configured rule in '%s[%i]' applied, '%s' is ignored",
 860                                      rule->config_file, rule->config_line, udev->kernel_name);
 861                                 udev->ignore_device = 1;
 862                                 return 0;
 863                         }
 864                         if (rule->ignore_remove) {
 865                                 udev->ignore_remove = 1;
 866                                 dbg("remove event should be ignored");
 867                         }
 868                         /* apply all_partitions option only at a main block device */
 869                         if (rule->partitions && udev->type == DEV_BLOCK && udev->kernel_number[0] == '\0') {
 870                                 udev->partitions = rule->partitions;
 871                                 dbg("creation of partition nodes requested");
 872                         }
 873
 874                         /* apply permissions */
 875                         if (!udev->mode_final && rule->mode != 0000) {
 876                                 if (rule->mode_operation == KEY_OP_ASSIGN_FINAL)
 877                                         udev->mode_final = 1;
 878                                 udev->mode = rule->mode;
 879                                 dbg("applied mode=%#o to '%s'", udev->mode, udev->kernel_name);
 880                         }
 881                         if (!udev->owner_final && rule->owner[0] != '\0') {
 882                                 if (rule->owner_operation == KEY_OP_ASSIGN_FINAL)
 883                                         udev->owner_final = 1;
 884                                 strlcpy(udev->owner, rule->owner, sizeof(udev->owner));
 885                                 apply_format(udev, udev->owner, sizeof(udev->owner), class_dev, sysfs_device);
 886                                 dbg("applied owner='%s' to '%s'", udev->owner, udev->kernel_name);
 887                         }
 888                         if (!udev->group_final && rule->group[0] != '\0') {
 889                                 if (rule->group_operation == KEY_OP_ASSIGN_FINAL)
 890                                         udev->group_final = 1;
 891                                 strlcpy(udev->group, rule->group, sizeof(udev->group));
 892                                 apply_format(udev, udev->group, sizeof(udev->group), class_dev, sysfs_device);
 893                                 dbg("applied group='%s' to '%s'", udev->group, udev->kernel_name);
 894                         }
 895
 896                         /* collect symlinks */
 897                         if (!udev->symlink_final && rule->symlink_operation != KEY_OP_UNSET) {
 898                                 char temp[PATH_SIZE];
 899                                 char *pos, *next;
 900
 901                                 if (rule->symlink_operation == KEY_OP_ASSIGN_FINAL)
 902                                         udev->symlink_final = 1;
 903                                 if (rule->symlink_operation == KEY_OP_ASSIGN || rule->symlink_operation == KEY_OP_ASSIGN_FINAL) {
 904                                         struct name_entry *name_loop;
 905                                         struct name_entry *temp_loop;
 906
 907                                         info("reset symlink list");
 908                                         list_for_each_entry_safe(name_loop, temp_loop, &udev->symlink_list, node) {
 909                                                 list_del(&name_loop->node);
 910                                                 free(name_loop);
 911                                         }
 912                                 }
 913                                 if (rule->symlink[0] != '\0') {
 914                                         info("configured rule in '%s[%i]' applied, added symlink '%s'",
 915                                              rule->config_file, rule->config_line, rule->symlink);
 916                                         strlcpy(temp, rule->symlink, sizeof(temp));
 917                                         apply_format(udev, temp, sizeof(temp), class_dev, sysfs_device);
 918
 919                                         /* add multiple symlinks separated by spaces */
 920                                         pos = temp;
 921                                         next = strchr(temp, ' ');
 922                                         while (next) {
 923                                                 next[0] = '\0';
 924                                                 info("add symlink '%s'", pos);
 925                                                 name_list_add(&udev->symlink_list, pos, 0);
 926                                                 pos = &next[1];
 927                                                 next = strchr(pos, ' ');
 928                                         }
 929                                         info("add symlink '%s'", pos);
 930                                         name_list_add(&udev->symlink_list, pos, 0);
 931                                 }
 932                         }
 933
 934                         /* set name, later rules with name set will be ignored */
 935                         if (rule->name_operation != KEY_OP_UNSET) {
 936                                 udev->name_set = 1;
 937                                 if (rule->name[0] == '\0') {
 938                                         info("configured rule in '%s[%i]' applied, node handling for '%s' supressed",
 939                                              rule->config_file, rule->config_line, udev->kernel_name);
 940                                 } else {
 941                                         strlcpy(udev->name, rule->name, sizeof(udev->name));
 942                                         apply_format(udev, udev->name, sizeof(udev->name), class_dev, sysfs_device);
 943                                         strlcpy(udev->config_file, rule->config_file, sizeof(udev->config_file));
 944                                         udev->config_line = rule->config_line;
 945
 946                                         info("configured rule in '%s:%i' applied, '%s' becomes '%s'",
 947                                              rule->config_file, rule->config_line, udev->kernel_name, rule->name);
 948                                         if (udev->type != DEV_NET)
 949                                                 dbg("name, '%s' is going to have owner='%s', group='%s', mode=%#o partitions=%i",
 950                                                     udev->name, udev->owner, udev->group, udev->mode, udev->partitions);
 951                                 }
 952                         }
 953
 954                         if (!udev->run_final && rule->run_operation != KEY_OP_UNSET) {
 955                                 char program[PATH_SIZE];
 956
 957                                 if (rule->run_operation == KEY_OP_ASSIGN_FINAL)
 958                                         udev->run_final = 1;
 959                                 if (rule->run_operation == KEY_OP_ASSIGN || rule->run_operation == KEY_OP_ASSIGN_FINAL) {
 960                                         struct name_entry *name_loop;
 961                                         struct name_entry *temp_loop;
 962
 963                                         info("reset run list");
 964                                         list_for_each_entry_safe(name_loop, temp_loop, &udev->run_list, node) {
 965                                                 list_del(&name_loop->node);
 966                                                 free(name_loop);
 967                                         }
 968                                 }
 969                                 if (rule->run[0] != '\0') {
 970                                         strlcpy(program, rule->run, sizeof(program));
 971                                         apply_format(udev, program, sizeof(program), class_dev, sysfs_device);
 972                                         dbg("add run '%s'", program);
 973                                         name_list_add(&udev->run_list, program, 0);
 974                                 }
 975                         }
 976
 977                         if (rule->last_rule) {
 978                                 dbg("last rule to be applied");
 979                                 break;
 980                         }
 981                 }
 982         }
 983
 984         if (udev->name[0] == '\0') {
 985                 strlcpy(udev->name, udev->kernel_name, sizeof(udev->name));
 986                 info("no rule found, use kernel name '%s'", udev->name);
 987         }
 988
 989         if (udev->tmp_node[0] != '\0') {
 990                 dbg("removing temporary device node");
 991                 unlink_secure(udev->tmp_node);
 992                 udev->tmp_node[0] = '\0';
 993         }
 994
 995         return 0;
 996 }
 997
 998 int udev_rules_get_run(struct udevice *udev, struct sysfs_device *sysfs_device)
 999 {
1000         struct udev_rule *rule;
1001
1002         /* look for a matching rule to apply */
1003         list_for_each_entry(rule, &udev_rule_list, node) {
1004                 dbg("process rule");
1005
1006                 if (rule->run_operation == KEY_OP_UNSET)
1007                         continue;
1008
1009                 if (rule->name_operation != KEY_OP_UNSET || rule->symlink_operation != KEY_OP_UNSET ||
1010                     rule->mode != 0000 || rule->owner[0] != '\0' || rule->group[0] != '\0') {
1011                         dbg("skip rule that names a device");
1012                         continue;
1013                 }
1014
1015                 if (match_rule(udev, rule, NULL, sysfs_device) == 0) {
1016                         if (rule->ignore_device) {
1017                                 info("configured rule in '%s[%i]' applied, '%s' is ignored",
1018                                      rule->config_file, rule->config_line, udev->kernel_name);
1019                                 udev->ignore_device = 1;
1020                                 return 0;
1021                         }
1022
1023                         if (!udev->run_final && rule->run_operation != KEY_OP_UNSET) {
1024                                 char program[PATH_SIZE];
1025
1026                                 if (rule->run_operation == KEY_OP_ASSIGN || rule->run_operation == KEY_OP_ASSIGN_FINAL) {
1027                                         struct name_entry *name_loop;
1028                                         struct name_entry *temp_loop;
1029
1030                                         info("reset run list");
1031                                         list_for_each_entry_safe(name_loop, temp_loop, &udev->run_list, node) {
1032                                                 list_del(&name_loop->node);
1033                                                 free(name_loop);
1034                                         }
1035                                 }
1036                                 if (rule->run[0] != '\0') {
1037                                         strlcpy(program, rule->run, sizeof(program));
1038                                         apply_format(udev, program, sizeof(program), NULL, sysfs_device);
1039                                         dbg("add run '%s'", program);
1040                                         name_list_add(&udev->run_list, program, 0);
1041                                 }
1042                                 if (rule->run_operation == KEY_OP_ASSIGN_FINAL)
1043                                         break;
1044                         }
1045
1046                         if (rule->last_rule) {
1047                                 dbg("last rule to be applied");
1048                                 break;
1049                         }
1050                 }
1051         }
1052
1053         return 0;
1054 }