udev_rules.c

   1 /*
   2  * udev_rules.c
   3  *
   4  * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
   5  * Copyright (C) 2003-2006 Kay Sievers <kay.sievers@vrfy.org>
   6  *
   7  *      This program is free software; you can redistribute it and/or modify it
   8  *      under the terms of the GNU General Public License as published by the
   9  *      Free Software Foundation version 2 of the License.
  10  *
  11  *      This program is distributed in the hope that it will be useful, but
  12  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  *      General Public License for more details.
  15  *
  16  *      You should have received a copy of the GNU General Public License along
  17  *      with this program; if not, write to the Free Software Foundation, Inc.,
  18  *      675 Mass Ave, Cambridge, MA 02139, USA.
  19  *
  20  */
  21
  22 #include <stddef.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <stdio.h>
  26 #include <fcntl.h>
  27 #include <ctype.h>
  28 #include <unistd.h>
  29 #include <errno.h>
  30 #include <syslog.h>
  31 #include <sys/wait.h>
  32 #include <sys/stat.h>
  33
  34 #include "udev.h"
  35 #include "udev_rules.h"
  36
  37
  38 /* extract possible {attr} and move str behind it */
  39 static char *get_format_attribute(char **str)
  40 {
  41         char *pos;
  42         char *attr = NULL;
  43
  44         if (*str[0] == '{') {
  45                 pos = strchr(*str, '}');
  46                 if (pos == NULL) {
  47                         err("missing closing brace for format");
  48                         return NULL;
  49                 }
  50                 pos[0] = '\0';
  51                 attr = *str+1;
  52                 *str = pos+1;
  53                 dbg("attribute='%s', str='%s'", attr, *str);
  54         }
  55         return attr;
  56 }
  57
  58 /* extract possible format length and move str behind it*/
  59 static int get_format_len(char **str)
  60 {
  61         int num;
  62         char *tail;
  63
  64         if (isdigit(*str[0])) {
  65                 num = (int) strtoul(*str, &tail, 10);
  66                 if (num > 0) {
  67                         *str = tail;
  68                         dbg("format length=%i", num);
  69                         return num;
  70                 } else {
  71                         err("format parsing error '%s'", *str);
  72                 }
  73         }
  74         return -1;
  75 }
  76
  77 static int get_key(char **line, char **key, char **value)
  78 {
  79         char *linepos;
  80         char *temp;
  81
  82         linepos = *line;
  83         if (!linepos)
  84                 return -1;
  85
  86         if (strchr(linepos, '\\')) {
  87                 dbg("escaped characters are not supported, skip");
  88                 return -1;
  89         }
  90
  91         /* skip whitespace */
  92         while (isspace(linepos[0]))
  93                 linepos++;
  94
  95         /* get the key */
  96         *key = linepos;
  97         while (1) {
  98                 linepos++;
  99                 if (linepos[0] == '\0')
 100                         return -1;
 101                 if (isspace(linepos[0]))
 102                         break;
 103                 if (linepos[0] == '=')
 104                         break;
 105         }
 106
 107         /* terminate key */
 108         linepos[0] = '\0';
 109         linepos++;
 110
 111         /* skip whitespace */
 112         while (isspace(linepos[0]))
 113                 linepos++;
 114
 115         /* get the value*/
 116         if (linepos[0] == '"') {
 117                 linepos++;
 118                 temp = strchr(linepos, '"');
 119                 if (!temp) {
 120                         dbg("missing closing quote");
 121                         return -1;
 122                 }
 123                 dbg("value is quoted");
 124                 temp[0] = '\0';
 125         } else if (linepos[0] == '\'') {
 126                 linepos++;
 127                 temp = strchr(linepos, '\'');
 128                 if (!temp) {
 129                         dbg("missing closing quote");
 130                         return -1;
 131                 }
 132                 dbg("value is quoted");
 133                 temp[0] = '\0';
 134         } else if (linepos[0] == '\0') {
 135                 dbg("value is empty");
 136         } else {
 137                 temp = linepos;
 138                 while (temp[0] && !isspace(temp[0]))
 139                         temp++;
 140                 temp[0] = '\0';
 141         }
 142         *value = linepos;
 143
 144         return 0;
 145 }
 146
 147 static int import_keys_into_env(struct udevice *udev, const char *buf, size_t bufsize)
 148 {
 149         char line[LINE_SIZE];
 150         const char *bufline;
 151         char *linepos;
 152         char *variable;
 153         char *value;
 154         size_t cur;
 155         size_t count;
 156         int lineno;
 157
 158         /* loop through the whole buffer */
 159         lineno = 0;
 160         cur = 0;
 161         while (cur < bufsize) {
 162                 count = buf_get_line(buf, bufsize, cur);
 163                 bufline = &buf[cur];
 164                 cur += count+1;
 165                 lineno++;
 166
 167                 if (count >= sizeof(line)) {
 168                         err("line too long, conf line skipped %s, line %d", udev_config_filename, lineno);
 169                         continue;
 170                 }
 171
 172                 /* eat the whitespace */
 173                 while ((count > 0) && isspace(bufline[0])) {
 174                         bufline++;
 175                         count--;
 176                 }
 177                 if (count == 0)
 178                         continue;
 179
 180                 /* see if this is a comment */
 181                 if (bufline[0] == COMMENT_CHARACTER)
 182                         continue;
 183
 184                 memcpy(line, bufline, count);
 185                 line[count] = '\0';
 186
 187                 linepos = line;
 188                 if (get_key(&linepos, &variable, &value) == 0) {
 189                         dbg("import '%s=%s'", variable, value);
 190                         name_list_key_add(&udev->env_list, variable, value);
 191                         setenv(variable, value, 1);
 192                 }
 193         }
 194
 195         return 0;
 196 }
 197
 198 static int import_file_into_env(struct udevice *udev, const char *filename)
 199 {
 200         char *buf;
 201         size_t bufsize;
 202
 203         if (file_map(filename, &buf, &bufsize) != 0) {
 204                 err("can't open '%s': %s", filename, strerror(errno));
 205                 return -1;
 206         }
 207         import_keys_into_env(udev, buf, bufsize);
 208         file_unmap(buf, bufsize);
 209
 210         return 0;
 211 }
 212
 213 static int import_program_into_env(struct udevice *udev, const char *program)
 214 {
 215         char result[1024];
 216         size_t reslen;
 217
 218         if (run_program(program, udev->dev->subsystem, result, sizeof(result), &reslen, (udev_log_priority >= LOG_INFO)) != 0)
 219                 return -1;
 220         return import_keys_into_env(udev, result, reslen);
 221 }
 222
 223 static int import_parent_into_env(struct udevice *udev, const char *filter)
 224 {
 225         struct sysfs_device *dev_parent;
 226         int rc = -1;
 227
 228         dev_parent = sysfs_device_get_parent(udev->dev);
 229         if (dev_parent != NULL) {
 230                 struct udevice *udev_parent;
 231                 struct name_entry *name_loop;
 232
 233                 dbg("found parent '%s', get the node name", dev_parent->devpath);
 234                 udev_parent = udev_device_init();
 235                 if (udev_parent == NULL)
 236                         return -1;
 237                 /* import the udev_db of the parent */
 238                 if (udev_db_get_device(udev_parent, dev_parent->devpath) == 0) {
 239                         dbg("import stored parent env '%s'", udev_parent->name);
 240                         list_for_each_entry(name_loop, &udev_parent->env_list, node) {
 241                                 char name[NAME_SIZE];
 242                                 char *pos;
 243
 244                                 strlcpy(name, name_loop->name, sizeof(name));
 245                                 pos = strchr(name, '=');
 246                                 if (pos) {
 247                                         pos[0] = '\0';
 248                                         pos++;
 249                                         if (strcmp_pattern(filter, name) == 0) {
 250                                                 dbg("import key '%s'", name_loop->name);
 251                                                 name_list_add(&udev->env_list, name_loop->name, 0);
 252                                                 setenv(name, pos, 1);
 253                                         } else
 254                                                 dbg("skip key '%s'", name_loop->name);
 255                                 }
 256                         }
 257                         rc = 0;
 258                 } else
 259                         dbg("parent not found in database");
 260                 udev_device_cleanup(udev_parent);
 261         }
 262
 263         return rc;
 264 }
 265
 266 static int match_name_and_get_number(const char *base, const char *devname)
 267 {
 268         size_t baselen;
 269         char *endptr;
 270         int num;
 271
 272         baselen = strlen(base);
 273         if (strncmp(base, devname, baselen) != 0)
 274                 return -1;
 275         if (devname[baselen] == '\0')
 276                 return 0;
 277         if (!isdigit(devname[baselen]))
 278                 return -1;
 279         num = strtoul(&devname[baselen], &endptr, 10);
 280         if (endptr[0] != '\0')
 281                 return -1;
 282         return num;
 283 }
 284
 285 /* finds the lowest positive device number such that <name>N isn't present in the udevdb
 286  * if <name> doesn't exist, 0 is returned, N otherwise */
 287 static int find_free_number(const char *base, const char *devpath)
 288 {
 289         char db_devpath[PATH_SIZE];
 290         char filename[PATH_SIZE];
 291         struct udevice *udev_db;
 292         int num = 0;
 293         static int warn = 1;
 294
 295         if (warn) {
 296                 err("%%e is deprecated, will be removed and is unlikely to work correctly. Don't use it.");
 297                 warn = 0;
 298         }
 299
 300         /* check if the device already owns a matching name */
 301         udev_db = udev_device_init();
 302         if (udev_db == NULL)
 303                 return -1;
 304         if (udev_db_get_device(udev_db, devpath) == 0) {
 305                 struct name_entry *name_loop;
 306                 int devnum;
 307
 308                 devnum = match_name_and_get_number(base, udev_db->name);
 309                 if (devnum >= 0) {
 310                         num = devnum;
 311                         dbg("device '%s', already has the node '%s' with num %u, use it", devpath, base, num);
 312                         goto out;
 313                 }
 314                 list_for_each_entry(name_loop, &udev_db->symlink_list, node) {
 315                         devnum = match_name_and_get_number(base, name_loop->name);
 316                         if (devnum >= 0) {
 317                                 num = devnum;
 318                                 dbg("device '%s', already has a symlink '%s' with num %u, use it", devpath, base, num);
 319                                 goto out;
 320                         }
 321                 }
 322         }
 323
 324         /* just search the database again and again until a free name is found */
 325         strlcpy(filename, base, sizeof(filename));
 326         while (1) {
 327                 dbg("look for existing node '%s'", filename);
 328                 if (udev_db_lookup_name(filename, db_devpath, sizeof(db_devpath)) != 0) {
 329                         dbg("free num=%d", num);
 330                         break;
 331                 }
 332
 333                 num++;
 334                 if (num > 100000) {
 335                         err("find_free_number aborted at num=%d", num);
 336                         num = -1;
 337                         break;
 338                 }
 339                 snprintf(filename, sizeof(filename), "%s%d", base, num);
 340                 filename[sizeof(filename)-1] = '\0';
 341         }
 342
 343 out:
 344         udev_device_cleanup(udev_db);
 345         return num;
 346 }
 347
 348 #define WAIT_LOOP_PER_SECOND            50
 349 static int wait_for_sysfs(struct udevice *udev, const char *file, int timeout)
 350 {
 351         char devicepath[PATH_SIZE];
 352         char filepath[PATH_SIZE];
 353         struct stat stats;
 354         int loop = timeout * WAIT_LOOP_PER_SECOND;
 355
 356         strlcpy(devicepath, sysfs_path, sizeof(devicepath));
 357         strlcat(devicepath, udev->dev->devpath, sizeof(devicepath));
 358         strlcpy(filepath, devicepath, sizeof(filepath));
 359         strlcat(filepath, "/", sizeof(filepath));
 360         strlcat(filepath, file, sizeof(filepath));
 361
 362         dbg("will wait %i sec for '%s'", timeout, filepath);
 363         while (--loop) {
 364                 /* lookup file */
 365                 if (stat(filepath, &stats) == 0) {
 366                         info("file '%s' appeared after %i loops", filepath, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
 367                         return 0;
 368                 }
 369                 /* make sure the device does not have disappeared in the meantime */
 370                 if (stat(devicepath, &stats) != 0) {
 371                         info("device disappeared while waiting for '%s'", filepath);
 372                         return -2;
 373                 }
 374                 info("wait for '%s' for %i mseconds", filepath, 1000 / WAIT_LOOP_PER_SECOND);
 375                 usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
 376         }
 377         err("waiting for '%s' failed", filepath);
 378         return -1;
 379 }
 380
 381 void udev_rules_apply_format(struct udevice *udev, char *string, size_t maxsize)
 382 {
 383         char temp[PATH_SIZE];
 384         char temp2[PATH_SIZE];
 385         char *head, *tail, *pos, *cpos, *attr, *rest;
 386         int len;
 387         int i;
 388         int count;
 389         unsigned int next_free_number;
 390         enum subst_type {
 391                 SUBST_UNKNOWN,
 392                 SUBST_DEVPATH,
 393                 SUBST_KERNEL_NUMBER,
 394                 SUBST_KERNEL_NAME,
 395                 SUBST_ID,
 396                 SUBST_MAJOR,
 397                 SUBST_MINOR,
 398                 SUBST_RESULT,
 399                 SUBST_SYSFS,
 400                 SUBST_ENUM,
 401                 SUBST_PARENT,
 402                 SUBST_TEMP_NODE,
 403                 SUBST_ROOT,
 404                 SUBST_ENV,
 405         };
 406         static const struct subst_map {
 407                 char *name;
 408                 char fmt;
 409                 enum subst_type type;
 410         } map[] = {
 411                 { .name = "devpath",            .fmt = 'p',     .type = SUBST_DEVPATH },
 412                 { .name = "number",             .fmt = 'n',     .type = SUBST_KERNEL_NUMBER },
 413                 { .name = "kernel",             .fmt = 'k',     .type = SUBST_KERNEL_NAME },
 414                 { .name = "id",                 .fmt = 'b',     .type = SUBST_ID },
 415                 { .name = "major",              .fmt = 'M',     .type = SUBST_MAJOR },
 416                 { .name = "minor",              .fmt = 'm',     .type = SUBST_MINOR },
 417                 { .name = "result",             .fmt = 'c',     .type = SUBST_RESULT },
 418                 { .name = "sysfs",              .fmt = 's',     .type = SUBST_SYSFS },
 419                 { .name = "enum",               .fmt = 'e',     .type = SUBST_ENUM },
 420                 { .name = "parent",             .fmt = 'P',     .type = SUBST_PARENT },
 421                 { .name = "tempnode",           .fmt = 'N',     .type = SUBST_TEMP_NODE },
 422                 { .name = "root",               .fmt = 'r',     .type = SUBST_ROOT },
 423                 { .name = "env",                .fmt = 'E',     .type = SUBST_ENV },
 424                 { NULL, '\0', 0 }
 425         };
 426         enum subst_type type;
 427         const struct subst_map *subst;
 428
 429         head = string;
 430         while (1) {
 431                 len = -1;
 432                 while (head[0] != '\0') {
 433                         if (head[0] == '$') {
 434                                 /* substitute named variable */
 435                                 if (head[1] == '\0')
 436                                         break;
 437                                 if (head[1] == '$') {
 438                                         strlcpy(temp, head+2, sizeof(temp));
 439                                         strlcpy(head+1, temp, maxsize);
 440                                         head++;
 441                                         continue;
 442                                 }
 443                                 head[0] = '\0';
 444                                 for (subst = map; subst->name; subst++) {
 445                                         if (strncasecmp(&head[1], subst->name, strlen(subst->name)) == 0) {
 446                                                 type = subst->type;
 447                                                 tail = head + strlen(subst->name)+1;
 448                                                 dbg("will substitute format name '%s'", subst->name);
 449                                                 goto found;
 450                                         }
 451                                 }
 452                         } else if (head[0] == '%') {
 453                                 /* substitute format char */
 454                                 if (head[1] == '\0')
 455                                         break;
 456                                 if (head[1] == '%') {
 457                                         strlcpy(temp, head+2, sizeof(temp));
 458                                         strlcpy(head+1, temp, maxsize);
 459                                         head++;
 460                                         continue;
 461                                 }
 462                                 head[0] = '\0';
 463                                 tail = head+1;
 464                                 len = get_format_len(&tail);
 465                                 for (subst = map; subst->name; subst++) {
 466                                         if (tail[0] == subst->fmt) {
 467                                                 type = subst->type;
 468                                                 tail++;
 469                                                 dbg("will substitute format char '%c'", subst->fmt);
 470                                                 goto found;
 471                                         }
 472                                 }
 473                         }
 474                         head++;
 475                 }
 476                 break;
 477 found:
 478                 attr = get_format_attribute(&tail);
 479                 strlcpy(temp, tail, sizeof(temp));
 480                 dbg("format=%i, string='%s', tail='%s'", type ,string, tail);
 481
 482                 switch (type) {
 483                 case SUBST_DEVPATH:
 484                         strlcat(string, udev->dev->devpath, maxsize);
 485                         dbg("substitute devpath '%s'", udev->dev->devpath);
 486                         break;
 487                 case SUBST_KERNEL_NAME:
 488                         strlcat(string, udev->dev->kernel_name, maxsize);
 489                         dbg("substitute kernel name '%s'", udev->dev->kernel_name);
 490                         break;
 491                 case SUBST_KERNEL_NUMBER:
 492                         strlcat(string, udev->dev->kernel_number, maxsize);
 493                         dbg("substitute kernel number '%s'", udev->dev->kernel_number);
 494                         break;
 495                 case SUBST_ID:
 496                         if (udev->dev_parent != NULL) {
 497                                 strlcat(string, udev->dev_parent->kernel_name, maxsize);
 498                                 dbg("substitute id '%s'", udev->dev_parent->kernel_name);
 499                         }
 500                         break;
 501                 case SUBST_MAJOR:
 502                         sprintf(temp2, "%d", major(udev->devt));
 503                         strlcat(string, temp2, maxsize);
 504                         dbg("substitute major number '%s'", temp2);
 505                         break;
 506                 case SUBST_MINOR:
 507                         sprintf(temp2, "%d", minor(udev->devt));
 508                         strlcat(string, temp2, maxsize);
 509                         dbg("substitute minor number '%s'", temp2);
 510                         break;
 511                 case SUBST_RESULT:
 512                         if (udev->program_result[0] == '\0')
 513                                 break;
 514                         /* get part part of the result string */
 515                         i = 0;
 516                         if (attr != NULL)
 517                                 i = strtoul(attr, &rest, 10);
 518                         if (i > 0) {
 519                                 dbg("request part #%d of result string", i);
 520                                 cpos = udev->program_result;
 521                                 while (--i) {
 522                                         while (cpos[0] != '\0' && !isspace(cpos[0]))
 523                                                 cpos++;
 524                                         while (isspace(cpos[0]))
 525                                                 cpos++;
 526                                 }
 527                                 if (i > 0) {
 528                                         err("requested part of result string not found");
 529                                         break;
 530                                 }
 531                                 strlcpy(temp2, cpos, sizeof(temp2));
 532                                 /* %{2+}c copies the whole string from the second part on */
 533                                 if (rest[0] != '+') {
 534                                         cpos = strchr(temp2, ' ');
 535                                         if (cpos)
 536                                                 cpos[0] = '\0';
 537                                 }
 538                                 strlcat(string, temp2, maxsize);
 539                                 dbg("substitute part of result string '%s'", temp2);
 540                         } else {
 541                                 strlcat(string, udev->program_result, maxsize);
 542                                 dbg("substitute result string '%s'", udev->program_result);
 543                         }
 544                         break;
 545                 case SUBST_SYSFS:
 546                         if (attr == NULL) {
 547                                 dbg("missing attribute");
 548                                 break;
 549                         } else {
 550                                 struct sysfs_device *dev_parent;
 551                                 const char *value;
 552
 553                                 dev_parent = udev->dev;
 554                                 do {
 555                                         dbg("looking at '%s'", dev_parent->devpath);
 556                                         value = sysfs_attr_get_value(dev_parent->devpath, attr);
 557                                         if (value != NULL) {
 558                                                 strlcpy(temp2, value, sizeof(temp2));
 559                                                 break;
 560                                         }
 561                                         dev_parent = sysfs_device_get_parent(dev_parent);
 562                                 } while (dev_parent != NULL);
 563
 564                                 /* strip trailing whitespace of sysfs value */
 565                                 i = strlen(temp2);
 566                                 while (i > 0 && isspace(temp2[i-1]))
 567                                         temp2[--i] = '\0';
 568                                 count = replace_untrusted_chars(temp2);
 569                                 if (count)
 570                                         info("%i untrusted character(s) replaced" , count);
 571                                 strlcat(string, temp2, maxsize);
 572                                 dbg("substitute sysfs value '%s'", temp2);
 573                         }
 574                         break;
 575                 case SUBST_ENUM:
 576                         next_free_number = find_free_number(string, udev->dev->devpath);
 577                         if (next_free_number > 0) {
 578                                 sprintf(temp2, "%d", next_free_number);
 579                                 strlcat(string, temp2, maxsize);
 580                         }
 581                         break;
 582                 case SUBST_PARENT:
 583                         {
 584                                 struct sysfs_device *dev_parent;
 585
 586                                 dev_parent = sysfs_device_get_parent(udev->dev);
 587                                 if (dev_parent != NULL) {
 588                                         struct udevice *udev_parent;
 589
 590                                         dbg("found parent '%s', get the node name", dev_parent->devpath);
 591                                         udev_parent = udev_device_init();
 592                                         if (udev_parent != NULL) {
 593                                                 /* lookup the name in the udev_db with the DEVPATH of the parent */
 594                                                 if (udev_db_get_device(udev_parent, dev_parent->devpath) == 0) {
 595                                                         strlcat(string, udev_parent->name, maxsize);
 596                                                         dbg("substitute parent node name'%s'", udev_parent->name);
 597                                                 } else
 598                                                         dbg("parent not found in database");
 599                                                 udev_device_cleanup(udev_parent);
 600                                         }
 601                                 }
 602                         }
 603                         break;
 604                 case SUBST_TEMP_NODE:
 605                         if (udev->tmp_node[0] == '\0') {
 606                                 dbg("create temporary device node for callout");
 607                                 snprintf(udev->tmp_node, sizeof(udev->tmp_node), "%s/.tmp-%u-%u",
 608                                          udev_root, major(udev->devt), minor(udev->devt));
 609                                 udev->tmp_node[sizeof(udev->tmp_node)-1] = '\0';
 610                                 udev_node_mknod(udev, udev->tmp_node, udev->devt, 0600, 0, 0);
 611                         }
 612                         strlcat(string, udev->tmp_node, maxsize);
 613                         dbg("substitute temporary device node name '%s'", udev->tmp_node);
 614                         break;
 615                 case SUBST_ROOT:
 616                         strlcat(string, udev_root, maxsize);
 617                         dbg("substitute udev_root '%s'", udev_root);
 618                         break;
 619                 case SUBST_ENV:
 620                         if (attr == NULL) {
 621                                 dbg("missing attribute");
 622                                 break;
 623                         }
 624                         pos = getenv(attr);
 625                         if (pos == NULL) {
 626                                 dbg("env '%s' not available", attr);
 627                                 break;
 628                         }
 629                         dbg("substitute env '%s=%s'", attr, pos);
 630                         strlcat(string, pos, maxsize);
 631                         break;
 632                 default:
 633                         err("unknown substitution type=%i", type);
 634                         break;
 635                 }
 636                 /* possibly truncate to format-char specified length */
 637                 if (len != -1) {
 638                         head[len] = '\0';
 639                         dbg("truncate to %i chars, subtitution string becomes '%s'", len, head);
 640                 }
 641                 strlcat(string, temp, maxsize);
 642         }
 643 }
 644
 645 static char *key_val(struct udev_rule *rule, struct key *key)
 646 {
 647         return rule->buf + key->val_off;
 648 }
 649
 650 static char *key_pair_name(struct udev_rule *rule, struct key_pair *pair)
 651 {
 652         return rule->buf + pair->key_name_off;
 653 }
 654
 655 static int match_key(const char *key_name, struct udev_rule *rule, struct key *key, const char *val)
 656 {
 657         int match;
 658         char value[PATH_SIZE];
 659         char *key_value;
 660         char *pos;
 661
 662         if (key->operation != KEY_OP_MATCH &&
 663             key->operation != KEY_OP_NOMATCH)
 664                 return 0;
 665
 666         strlcpy(value, rule->buf + key->val_off, sizeof(value));
 667         key_value = value;
 668
 669         dbg("key %s value='%s'", key_name, key_value);
 670         while (key_value) {
 671                 pos = strchr(key_value, '|');
 672                 if (pos) {
 673                         pos[0] = '\0';
 674                         pos++;
 675                 }
 676                 dbg("match %s '%s' <-> '%s'", key_name, key_value, val);
 677                 match = (strcmp_pattern(key_value, val) == 0);
 678                 if (match && (key->operation != KEY_OP_NOMATCH)) {
 679                         dbg("%s is true (matching value)", key_name);
 680                         return 0;
 681                 }
 682                 if (!match && (key->operation == KEY_OP_NOMATCH)) {
 683                         dbg("%s is true (non-matching value)", key_name);
 684                         return 0;
 685                 }
 686                 key_value = pos;
 687         }
 688         dbg("%s is false", key_name);
 689         return -1;
 690 }
 691
 692 /* match a single rule against a given device and possibly its parent devices */
 693 static int match_rule(struct udevice *udev, struct udev_rule *rule)
 694 {
 695         int i;
 696
 697         if (match_key("ACTION", rule, &rule->action, udev->action))
 698                 goto nomatch;
 699
 700         if (match_key("KERNEL", rule, &rule->kernel_name, udev->dev->kernel_name))
 701                 goto nomatch;
 702
 703         if (match_key("SUBSYSTEM", rule, &rule->subsystem, udev->dev->subsystem))
 704                 goto nomatch;
 705
 706         if (match_key("DEVPATH", rule, &rule->devpath, udev->dev->devpath))
 707                 goto nomatch;
 708
 709         /* compare NAME against a previously assigned value */
 710         if (match_key("NAME", rule, &rule->name, udev->name))
 711                 goto nomatch;
 712
 713         for (i = 0; i < rule->env.count; i++) {
 714                 struct key_pair *pair = &rule->env.keys[i];
 715
 716                 /* we only check for matches, assignments will be handled later */
 717                 if (pair->key.operation == KEY_OP_MATCH ||
 718                     pair->key.operation == KEY_OP_NOMATCH) {
 719                         const char *key_name = key_pair_name(rule, pair);
 720                         const char *value = getenv(key_name);
 721
 722                         if (!value) {
 723                                 dbg("ENV{'%s'} is not set, treat as empty", key_name);
 724                                 value = "";
 725                         }
 726                         if (match_key("ENV", rule, &pair->key, value))
 727                                 goto nomatch;
 728                 }
 729         }
 730
 731         if (rule->wait_for_sysfs.operation != KEY_OP_UNSET) {
 732                 int found;
 733
 734                 found = (wait_for_sysfs(udev, key_val(rule, &rule->wait_for_sysfs), 3) == 0);
 735                 if (!found && (rule->wait_for_sysfs.operation != KEY_OP_NOMATCH)) {
 736                         dbg("WAIT_FOR_SYSFS failed");
 737                         goto nomatch;
 738                 }
 739         }
 740
 741         /* walk up the chain of parent devices and find a match */
 742         udev->dev_parent = udev->dev;
 743         while (1) {
 744                 /* check for matching driver */
 745                 if (match_key("DRIVER", rule, &rule->driver, udev->dev_parent->driver))
 746                         goto try_parent;
 747
 748                 /* check for matching subsystem/bus value */
 749                 if (match_key("BUS", rule, &rule->bus, udev->dev_parent->subsystem))
 750                         goto try_parent;
 751
 752                 /* check for matching bus id (device name) */
 753                 if (match_key("ID", rule, &rule->id, udev->dev_parent->kernel_name))
 754                         goto try_parent;
 755
 756                 /* check for matching sysfs pairs */
 757                 if (rule->sysfs.count) {
 758                         dbg("check %i SYSFS keys", rule->sysfs.count);
 759                         for (i = 0; i < rule->sysfs.count; i++) {
 760                                 struct key_pair *pair = &rule->sysfs.keys[i];
 761                                 const char *key_name = key_pair_name(rule, pair);
 762                                 const char *key_value = key_val(rule, &pair->key);
 763                                 const char *value;
 764                                 char val[VALUE_SIZE];
 765                                 size_t len;
 766
 767                                 value = sysfs_attr_get_value(udev->dev_parent->devpath, key_name);
 768                                 if (value == NULL)
 769                                         value = sysfs_attr_get_value(udev->dev->devpath, key_name);
 770                                 if (value == NULL)
 771                                         goto try_parent;
 772                                 strlcpy(val, value, sizeof(val));
 773
 774                                 /* strip trailing whitespace of value, if not asked to match for it */
 775                                 len = strlen(key_value);
 776                                 if (len > 0 && !isspace(key_value[len-1])) {
 777                                         len = strlen(val);
 778                                         while (len > 0 && isspace(val[len-1]))
 779                                                 val[--len] = '\0';
 780                                         dbg("removed %zi trailing whitespace chars from '%s'", strlen(val)-len, val);
 781                                 }
 782
 783                                 if (match_key("SYSFS", rule, &pair->key, val))
 784                                         goto try_parent;
 785                         }
 786                         dbg("all %i SYSFS keys matched", rule->sysfs.count);
 787                 }
 788
 789                 /* found matching device  */
 790                 break;
 791 try_parent:
 792                 /* move to parent device */
 793                 dbg("try parent sysfs device");
 794                 udev->dev_parent = sysfs_device_get_parent(udev->dev_parent);
 795                 if (udev->dev_parent == NULL)
 796                         goto nomatch;
 797                 dbg("looking at dev_parent->devpath='%s'", udev->dev_parent->devpath);
 798                 dbg("looking at dev_parent->bus_kernel_name='%s'", udev->dev_parent->kernel_name);
 799         }
 800
 801         /* execute external program */
 802         if (rule->program.operation != KEY_OP_UNSET) {
 803                 char program[PATH_SIZE];
 804                 char result[PATH_SIZE];
 805
 806                 strlcpy(program, key_val(rule, &rule->program), sizeof(program));
 807                 udev_rules_apply_format(udev, program, sizeof(program));
 808                 if (run_program(program, udev->dev->subsystem, result, sizeof(result), NULL, (udev_log_priority >= LOG_INFO)) != 0) {
 809                         dbg("PROGRAM is false");
 810                         udev->program_result[0] = '\0';
 811                         if (rule->program.operation != KEY_OP_NOMATCH)
 812                                 goto nomatch;
 813                 } else {
 814                         int count;
 815
 816                         dbg("PROGRAM matches");
 817                         remove_trailing_chars(result, '\n');
 818                         count = replace_untrusted_chars(result);
 819                         if (count)
 820                                 info("%i untrusted character(s) replaced" , count);
 821                         dbg("result is '%s'", result);
 822                         strlcpy(udev->program_result, result, sizeof(udev->program_result));
 823                         dbg("PROGRAM returned successful");
 824                         if (rule->program.operation == KEY_OP_NOMATCH)
 825                                 goto nomatch;
 826                 }
 827                 dbg("PROGRAM key is true");
 828         }
 829
 830         /* check for matching result of external program */
 831         if (match_key("RESULT", rule, &rule->result, udev->program_result))
 832                 goto nomatch;
 833
 834         /* import variables returned from program or or file into environment */
 835         if (rule->import.operation != KEY_OP_UNSET) {
 836                 char import[PATH_SIZE];
 837                 int rc = -1;
 838
 839                 strlcpy(import, key_val(rule, &rule->import), sizeof(import));
 840                 udev_rules_apply_format(udev, import, sizeof(import));
 841                 dbg("check for IMPORT import='%s'", import);
 842                 if (rule->import_type == IMPORT_PROGRAM) {
 843                         rc = import_program_into_env(udev, import);
 844                 } else if (rule->import_type == IMPORT_FILE) {
 845                         dbg("import file import='%s'", import);
 846                         rc = import_file_into_env(udev, import);
 847                 } else if (rule->import_type == IMPORT_PARENT) {
 848                         dbg("import parent import='%s'", import);
 849                         rc = import_parent_into_env(udev, import);
 850                 }
 851                 if (rc != 0) {
 852                         dbg("IMPORT failed");
 853                         if (rule->import.operation != KEY_OP_NOMATCH)
 854                                 goto nomatch;
 855                 } else
 856                         dbg("IMPORT '%s' imported", key_val(rule, &rule->import));
 857                 dbg("IMPORT key is true");
 858         }
 859
 860         /* rule matches, if we have ENV assignments export it */
 861         for (i = 0; i < rule->env.count; i++) {
 862                 struct key_pair *pair = &rule->env.keys[i];
 863
 864                 if (pair->key.operation == KEY_OP_ASSIGN) {
 865                         const char *key_name = key_pair_name(rule, pair);
 866                         const char *value = key_val(rule, &pair->key);
 867                         char *key_value = name_list_key_add(&udev->env_list, key_name, value);
 868                         if (key_value == NULL)
 869                                 break;
 870
 871                         udev_rules_apply_format(udev, key_value, NAME_SIZE);
 872                         putenv(key_value);
 873                         dbg("export ENV '%s'", key_value);
 874                 }
 875         }
 876
 877         return 0;
 878
 879 nomatch:
 880         return -1;
 881 }
 882
 883 int udev_rules_get_name(struct udev_rules *rules, struct udevice *udev)
 884 {
 885         struct udev_rule *rule;
 886         int name_set = 0;
 887
 888         dbg("udev->dev->devpath='%s'", udev->dev->devpath);
 889         dbg("udev->dev->kernel_name='%s'", udev->dev->kernel_name);
 890
 891         /* look for a matching rule to apply */
 892         udev_rules_iter_init(rules);
 893         while (1) {
 894                 rule = udev_rules_iter_next(rules);
 895                 if (rule == NULL)
 896                         break;
 897
 898                 if (name_set &&
 899                     (rule->name.operation == KEY_OP_ASSIGN ||
 900                      rule->name.operation == KEY_OP_ASSIGN_FINAL ||
 901                      rule->name.operation == KEY_OP_ADD)) {
 902                         dbg("node name already set, rule ignored");
 903                         continue;
 904                 }
 905
 906                 dbg("process rule");
 907                 if (match_rule(udev, rule) == 0) {
 908                         /* apply options */
 909                         if (rule->ignore_device) {
 910                                 info("rule applied, '%s' is ignored", udev->dev->kernel_name);
 911                                 udev->ignore_device = 1;
 912                                 return 0;
 913                         }
 914                         if (rule->ignore_remove) {
 915                                 udev->ignore_remove = 1;
 916                                 dbg("remove event should be ignored");
 917                         }
 918                         /* apply all_partitions option only at a main block device */
 919                         if (rule->partitions &&
 920                             strcmp(udev->dev->subsystem, "block") == 0 && udev->dev->kernel_number[0] == '\0') {
 921                                 udev->partitions = rule->partitions;
 922                                 dbg("creation of partition nodes requested");
 923                         }
 924
 925                         /* apply permissions */
 926                         if (!udev->mode_final && rule->mode != 0000) {
 927                                 if (rule->mode_operation == KEY_OP_ASSIGN_FINAL)
 928                                         udev->mode_final = 1;
 929                                 udev->mode = rule->mode;
 930                                 dbg("applied mode=%#o to '%s'", rule->mode, udev->dev->kernel_name);
 931                         }
 932                         if (!udev->owner_final && rule->owner.operation != KEY_OP_UNSET) {
 933                                 if (rule->owner.operation == KEY_OP_ASSIGN_FINAL)
 934                                         udev->owner_final = 1;
 935                                 strlcpy(udev->owner, key_val(rule, &rule->owner), sizeof(udev->owner));
 936                                 udev_rules_apply_format(udev, udev->owner, sizeof(udev->owner));
 937                                 dbg("applied owner='%s' to '%s'", udev->owner, udev->dev->kernel_name);
 938                         }
 939                         if (!udev->group_final && rule->group.operation != KEY_OP_UNSET) {
 940                                 if (rule->group.operation == KEY_OP_ASSIGN_FINAL)
 941                                         udev->group_final = 1;
 942                                 strlcpy(udev->group, key_val(rule, &rule->group), sizeof(udev->group));
 943                                 udev_rules_apply_format(udev, udev->group, sizeof(udev->group));
 944                                 dbg("applied group='%s' to '%s'", udev->group, udev->dev->kernel_name);
 945                         }
 946
 947                         /* collect symlinks */
 948                         if (!udev->symlink_final && rule->symlink.operation != KEY_OP_UNSET) {
 949                                 char temp[PATH_SIZE];
 950                                 char *pos, *next;
 951                                 int count;
 952
 953                                 if (rule->symlink.operation == KEY_OP_ASSIGN_FINAL)
 954                                         udev->symlink_final = 1;
 955                                 if (rule->symlink.operation == KEY_OP_ASSIGN || rule->symlink.operation == KEY_OP_ASSIGN_FINAL) {
 956                                         info("reset symlink list");
 957                                         name_list_cleanup(&udev->symlink_list);
 958                                 }
 959                                 strlcpy(temp, key_val(rule, &rule->symlink), sizeof(temp));
 960                                 udev_rules_apply_format(udev, temp, sizeof(temp));
 961                                 count = replace_untrusted_chars(temp);
 962                                 if (count)
 963                                         info("%i untrusted character(s) replaced" , count);
 964                                 dbg("rule applied, added symlink(s) '%s'", temp);
 965
 966                                 /* add multiple symlinks separated by spaces */
 967                                 pos = temp;
 968                                 while (isspace(pos[0]))
 969                                         pos++;
 970                                 next = strchr(pos, ' ');
 971                                 while (next) {
 972                                         next[0] = '\0';
 973                                         info("add symlink '%s'", pos);
 974                                         name_list_add(&udev->symlink_list, pos, 0);
 975                                         while (isspace(next[1]))
 976                                                 next++;
 977                                         pos = &next[1];
 978                                         next = strchr(pos, ' ');
 979                                 }
 980                                 if (pos[0] != '\0') {
 981                                         info("add symlink '%s'", pos);
 982                                         name_list_add(&udev->symlink_list, pos, 0);
 983                                 }
 984                         }
 985
 986                         /* set name, later rules with name set will be ignored */
 987                         if (rule->name.operation == KEY_OP_ASSIGN ||
 988                             rule->name.operation == KEY_OP_ASSIGN_FINAL ||
 989                             rule->name.operation == KEY_OP_ADD) {
 990                                 int count;
 991
 992                                 name_set = 1;
 993                                 strlcpy(udev->name, key_val(rule, &rule->name), sizeof(udev->name));
 994                                 udev_rules_apply_format(udev, udev->name, sizeof(udev->name));
 995                                 count = replace_untrusted_chars(udev->name);
 996                                 if (count)
 997                                         info("%i untrusted character(s) replaced", count);
 998
 999                                 info("rule applied, '%s' becomes '%s'", udev->dev->kernel_name, udev->name);
1000                                 if (strcmp(udev->dev->subsystem, "net") != 0)
1001                                         dbg("name, '%s' is going to have owner='%s', group='%s', mode=%#o partitions=%i",
1002                                             udev->name, udev->owner, udev->group, udev->mode, udev->partitions);
1003                         }
1004
1005                         if (!udev->run_final && rule->run.operation != KEY_OP_UNSET) {
1006                                 if (rule->run.operation == KEY_OP_ASSIGN_FINAL)
1007                                         udev->run_final = 1;
1008                                 if (rule->run.operation == KEY_OP_ASSIGN || rule->run.operation == KEY_OP_ASSIGN_FINAL) {
1009                                         info("reset run list");
1010                                         name_list_cleanup(&udev->run_list);
1011                                 }
1012                                 dbg("add run '%s'", key_val(rule, &rule->run));
1013                                 name_list_add(&udev->run_list, key_val(rule, &rule->run), 0);
1014                         }
1015
1016                         if (rule->last_rule) {
1017                                 dbg("last rule to be applied");
1018                                 break;
1019                         }
1020
1021                         if (rule->goto_label.operation != KEY_OP_UNSET) {
1022                                 dbg("moving forward to label '%s'", key_val(rule, &rule->goto_label));
1023                                 udev_rules_iter_label(rules, key_val(rule, &rule->goto_label));
1024                         }
1025                 }
1026         }
1027
1028         if (!name_set) {
1029                 strlcpy(udev->name, udev->dev->kernel_name, sizeof(udev->name));
1030                 info("no node name set, will use kernel name '%s'", udev->name);
1031         }
1032
1033         if (udev->tmp_node[0] != '\0') {
1034                 dbg("removing temporary device node");
1035                 unlink_secure(udev->tmp_node);
1036                 udev->tmp_node[0] = '\0';
1037         }
1038
1039         return 0;
1040 }
1041
1042 int udev_rules_get_run(struct udev_rules *rules, struct udevice *udev)
1043 {
1044         struct udev_rule *rule;
1045
1046         dbg("udev->kernel_name='%s'", udev->dev->kernel_name);
1047
1048         /* look for a matching rule to apply */
1049         udev_rules_iter_init(rules);
1050         while (1) {
1051                 rule = udev_rules_iter_next(rules);
1052                 if (rule == NULL)
1053                         break;
1054
1055                 dbg("process rule");
1056                 if (rule->name.operation != KEY_OP_UNSET || rule->symlink.operation != KEY_OP_UNSET ||
1057                     rule->mode_operation != KEY_OP_UNSET || rule->owner.operation != KEY_OP_UNSET || rule->group.operation != KEY_OP_UNSET) {
1058                         dbg("skip rule that names a device");
1059                         continue;
1060                 }
1061
1062                 if (match_rule(udev, rule) == 0) {
1063                         if (rule->ignore_device) {
1064                                 info("rule applied, '%s' is ignored", udev->dev->kernel_name);
1065                                 udev->ignore_device = 1;
1066                                 return 0;
1067                         }
1068
1069                         if (!udev->run_final && rule->run.operation != KEY_OP_UNSET) {
1070                                 if (rule->run.operation == KEY_OP_ASSIGN || rule->run.operation == KEY_OP_ASSIGN_FINAL) {
1071                                         info("reset run list");
1072                                         name_list_cleanup(&udev->run_list);
1073                                 }
1074                                 dbg("add run '%s'", key_val(rule, &rule->run));
1075                                 name_list_add(&udev->run_list, key_val(rule, &rule->run), 0);
1076                                 if (rule->run.operation == KEY_OP_ASSIGN_FINAL)
1077                                         break;
1078                         }
1079
1080                         if (rule->last_rule) {
1081                                 dbg("last rule to be applied");
1082                                 break;
1083                         }
1084
1085                         if (rule->goto_label.operation != KEY_OP_UNSET) {
1086                                 dbg("moving forward to label '%s'", key_val(rule, &rule->goto_label));
1087                                 udev_rules_iter_label(rules, key_val(rule, &rule->goto_label));
1088                         }
1089                 }
1090         }
1091
1092         return 0;
1093 }