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 #define WAIT_LOOP_PER_SECOND            50
 267 static int wait_for_sysfs(struct udevice *udev, const char *file, int timeout)
 268 {
 269         char devicepath[PATH_SIZE];
 270         char filepath[PATH_SIZE];
 271         struct stat stats;
 272         int loop = timeout * WAIT_LOOP_PER_SECOND;
 273
 274         strlcpy(devicepath, sysfs_path, sizeof(devicepath));
 275         strlcat(devicepath, udev->dev->devpath, sizeof(devicepath));
 276         strlcpy(filepath, devicepath, sizeof(filepath));
 277         strlcat(filepath, "/", sizeof(filepath));
 278         strlcat(filepath, file, sizeof(filepath));
 279
 280         dbg("will wait %i sec for '%s'", timeout, filepath);
 281         while (--loop) {
 282                 /* lookup file */
 283                 if (stat(filepath, &stats) == 0) {
 284                         info("file '%s' appeared after %i loops", filepath, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
 285                         return 0;
 286                 }
 287                 /* make sure the device does not have disappeared in the meantime */
 288                 if (stat(devicepath, &stats) != 0) {
 289                         info("device disappeared while waiting for '%s'", filepath);
 290                         return -2;
 291                 }
 292                 info("wait for '%s' for %i mseconds", filepath, 1000 / WAIT_LOOP_PER_SECOND);
 293                 usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
 294         }
 295         err("waiting for '%s' failed", filepath);
 296         return -1;
 297 }
 298
 299 void udev_rules_apply_format(struct udevice *udev, char *string, size_t maxsize)
 300 {
 301         char temp[PATH_SIZE];
 302         char temp2[PATH_SIZE];
 303         char *head, *tail, *pos, *cpos, *attr, *rest;
 304         int len;
 305         int i;
 306         int count;
 307         enum subst_type {
 308                 SUBST_UNKNOWN,
 309                 SUBST_DEVPATH,
 310                 SUBST_KERNEL_NUMBER,
 311                 SUBST_KERNEL_NAME,
 312                 SUBST_ID,
 313                 SUBST_MAJOR,
 314                 SUBST_MINOR,
 315                 SUBST_RESULT,
 316                 SUBST_SYSFS,
 317                 SUBST_PARENT,
 318                 SUBST_TEMP_NODE,
 319                 SUBST_ROOT,
 320                 SUBST_ENV,
 321         };
 322         static const struct subst_map {
 323                 char *name;
 324                 char fmt;
 325                 enum subst_type type;
 326         } map[] = {
 327                 { .name = "devpath",            .fmt = 'p',     .type = SUBST_DEVPATH },
 328                 { .name = "number",             .fmt = 'n',     .type = SUBST_KERNEL_NUMBER },
 329                 { .name = "kernel",             .fmt = 'k',     .type = SUBST_KERNEL_NAME },
 330                 { .name = "id",                 .fmt = 'b',     .type = SUBST_ID },
 331                 { .name = "major",              .fmt = 'M',     .type = SUBST_MAJOR },
 332                 { .name = "minor",              .fmt = 'm',     .type = SUBST_MINOR },
 333                 { .name = "result",             .fmt = 'c',     .type = SUBST_RESULT },
 334                 { .name = "sysfs",              .fmt = 's',     .type = SUBST_SYSFS },
 335                 { .name = "parent",             .fmt = 'P',     .type = SUBST_PARENT },
 336                 { .name = "tempnode",           .fmt = 'N',     .type = SUBST_TEMP_NODE },
 337                 { .name = "root",               .fmt = 'r',     .type = SUBST_ROOT },
 338                 { .name = "env",                .fmt = 'E',     .type = SUBST_ENV },
 339                 { NULL, '\0', 0 }
 340         };
 341         enum subst_type type;
 342         const struct subst_map *subst;
 343
 344         head = string;
 345         while (1) {
 346                 len = -1;
 347                 while (head[0] != '\0') {
 348                         if (head[0] == '$') {
 349                                 /* substitute named variable */
 350                                 if (head[1] == '\0')
 351                                         break;
 352                                 if (head[1] == '$') {
 353                                         strlcpy(temp, head+2, sizeof(temp));
 354                                         strlcpy(head+1, temp, maxsize);
 355                                         head++;
 356                                         continue;
 357                                 }
 358                                 head[0] = '\0';
 359                                 for (subst = map; subst->name; subst++) {
 360                                         if (strncasecmp(&head[1], subst->name, strlen(subst->name)) == 0) {
 361                                                 type = subst->type;
 362                                                 tail = head + strlen(subst->name)+1;
 363                                                 dbg("will substitute format name '%s'", subst->name);
 364                                                 goto found;
 365                                         }
 366                                 }
 367                         } else if (head[0] == '%') {
 368                                 /* substitute format char */
 369                                 if (head[1] == '\0')
 370                                         break;
 371                                 if (head[1] == '%') {
 372                                         strlcpy(temp, head+2, sizeof(temp));
 373                                         strlcpy(head+1, temp, maxsize);
 374                                         head++;
 375                                         continue;
 376                                 }
 377                                 head[0] = '\0';
 378                                 tail = head+1;
 379                                 len = get_format_len(&tail);
 380                                 for (subst = map; subst->name; subst++) {
 381                                         if (tail[0] == subst->fmt) {
 382                                                 type = subst->type;
 383                                                 tail++;
 384                                                 dbg("will substitute format char '%c'", subst->fmt);
 385                                                 goto found;
 386                                         }
 387                                 }
 388                         }
 389                         head++;
 390                 }
 391                 break;
 392 found:
 393                 attr = get_format_attribute(&tail);
 394                 strlcpy(temp, tail, sizeof(temp));
 395                 dbg("format=%i, string='%s', tail='%s'", type ,string, tail);
 396
 397                 switch (type) {
 398                 case SUBST_DEVPATH:
 399                         strlcat(string, udev->dev->devpath, maxsize);
 400                         dbg("substitute devpath '%s'", udev->dev->devpath);
 401                         break;
 402                 case SUBST_KERNEL_NAME:
 403                         strlcat(string, udev->dev->kernel_name, maxsize);
 404                         dbg("substitute kernel name '%s'", udev->dev->kernel_name);
 405                         break;
 406                 case SUBST_KERNEL_NUMBER:
 407                         strlcat(string, udev->dev->kernel_number, maxsize);
 408                         dbg("substitute kernel number '%s'", udev->dev->kernel_number);
 409                         break;
 410                 case SUBST_ID:
 411                         if (udev->dev_parent != NULL) {
 412                                 strlcat(string, udev->dev_parent->kernel_name, maxsize);
 413                                 dbg("substitute id '%s'", udev->dev_parent->kernel_name);
 414                         }
 415                         break;
 416                 case SUBST_MAJOR:
 417                         sprintf(temp2, "%d", major(udev->devt));
 418                         strlcat(string, temp2, maxsize);
 419                         dbg("substitute major number '%s'", temp2);
 420                         break;
 421                 case SUBST_MINOR:
 422                         sprintf(temp2, "%d", minor(udev->devt));
 423                         strlcat(string, temp2, maxsize);
 424                         dbg("substitute minor number '%s'", temp2);
 425                         break;
 426                 case SUBST_RESULT:
 427                         if (udev->program_result[0] == '\0')
 428                                 break;
 429                         /* get part part of the result string */
 430                         i = 0;
 431                         if (attr != NULL)
 432                                 i = strtoul(attr, &rest, 10);
 433                         if (i > 0) {
 434                                 dbg("request part #%d of result string", i);
 435                                 cpos = udev->program_result;
 436                                 while (--i) {
 437                                         while (cpos[0] != '\0' && !isspace(cpos[0]))
 438                                                 cpos++;
 439                                         while (isspace(cpos[0]))
 440                                                 cpos++;
 441                                 }
 442                                 if (i > 0) {
 443                                         err("requested part of result string not found");
 444                                         break;
 445                                 }
 446                                 strlcpy(temp2, cpos, sizeof(temp2));
 447                                 /* %{2+}c copies the whole string from the second part on */
 448                                 if (rest[0] != '+') {
 449                                         cpos = strchr(temp2, ' ');
 450                                         if (cpos)
 451                                                 cpos[0] = '\0';
 452                                 }
 453                                 strlcat(string, temp2, maxsize);
 454                                 dbg("substitute part of result string '%s'", temp2);
 455                         } else {
 456                                 strlcat(string, udev->program_result, maxsize);
 457                                 dbg("substitute result string '%s'", udev->program_result);
 458                         }
 459                         break;
 460                 case SUBST_SYSFS:
 461                         if (attr == NULL) {
 462                                 dbg("missing attribute");
 463                                 break;
 464                         } else {
 465                                 struct sysfs_device *dev_parent;
 466                                 const char *value;
 467
 468                                 dev_parent = udev->dev;
 469                                 do {
 470                                         dbg("looking at '%s'", dev_parent->devpath);
 471                                         value = sysfs_attr_get_value(dev_parent->devpath, attr);
 472                                         if (value != NULL) {
 473                                                 strlcpy(temp2, value, sizeof(temp2));
 474                                                 break;
 475                                         }
 476                                         dev_parent = sysfs_device_get_parent(dev_parent);
 477                                 } while (dev_parent != NULL);
 478
 479                                 /* strip trailing whitespace of sysfs value */
 480                                 i = strlen(temp2);
 481                                 while (i > 0 && isspace(temp2[i-1]))
 482                                         temp2[--i] = '\0';
 483                                 count = replace_untrusted_chars(temp2);
 484                                 if (count)
 485                                         info("%i untrusted character(s) replaced" , count);
 486                                 strlcat(string, temp2, maxsize);
 487                                 dbg("substitute sysfs value '%s'", temp2);
 488                         }
 489                         break;
 490                 case SUBST_PARENT:
 491                         {
 492                                 struct sysfs_device *dev_parent;
 493
 494                                 dev_parent = sysfs_device_get_parent(udev->dev);
 495                                 if (dev_parent != NULL) {
 496                                         struct udevice *udev_parent;
 497
 498                                         dbg("found parent '%s', get the node name", dev_parent->devpath);
 499                                         udev_parent = udev_device_init();
 500                                         if (udev_parent != NULL) {
 501                                                 /* lookup the name in the udev_db with the DEVPATH of the parent */
 502                                                 if (udev_db_get_device(udev_parent, dev_parent->devpath) == 0) {
 503                                                         strlcat(string, udev_parent->name, maxsize);
 504                                                         dbg("substitute parent node name'%s'", udev_parent->name);
 505                                                 } else
 506                                                         dbg("parent not found in database");
 507                                                 udev_device_cleanup(udev_parent);
 508                                         }
 509                                 }
 510                         }
 511                         break;
 512                 case SUBST_TEMP_NODE:
 513                         if (udev->tmp_node[0] == '\0') {
 514                                 dbg("create temporary device node for callout");
 515                                 snprintf(udev->tmp_node, sizeof(udev->tmp_node), "%s/.tmp-%u-%u",
 516                                          udev_root, major(udev->devt), minor(udev->devt));
 517                                 udev->tmp_node[sizeof(udev->tmp_node)-1] = '\0';
 518                                 udev_node_mknod(udev, udev->tmp_node, udev->devt, 0600, 0, 0);
 519                         }
 520                         strlcat(string, udev->tmp_node, maxsize);
 521                         dbg("substitute temporary device node name '%s'", udev->tmp_node);
 522                         break;
 523                 case SUBST_ROOT:
 524                         strlcat(string, udev_root, maxsize);
 525                         dbg("substitute udev_root '%s'", udev_root);
 526                         break;
 527                 case SUBST_ENV:
 528                         if (attr == NULL) {
 529                                 dbg("missing attribute");
 530                                 break;
 531                         }
 532                         pos = getenv(attr);
 533                         if (pos == NULL) {
 534                                 dbg("env '%s' not available", attr);
 535                                 break;
 536                         }
 537                         dbg("substitute env '%s=%s'", attr, pos);
 538                         strlcat(string, pos, maxsize);
 539                         break;
 540                 default:
 541                         err("unknown substitution type=%i", type);
 542                         break;
 543                 }
 544                 /* possibly truncate to format-char specified length */
 545                 if (len != -1) {
 546                         head[len] = '\0';
 547                         dbg("truncate to %i chars, subtitution string becomes '%s'", len, head);
 548                 }
 549                 strlcat(string, temp, maxsize);
 550         }
 551 }
 552
 553 static char *key_val(struct udev_rule *rule, struct key *key)
 554 {
 555         return rule->buf + key->val_off;
 556 }
 557
 558 static char *key_pair_name(struct udev_rule *rule, struct key_pair *pair)
 559 {
 560         return rule->buf + pair->key_name_off;
 561 }
 562
 563 static int match_key(const char *key_name, struct udev_rule *rule, struct key *key, const char *val)
 564 {
 565         int match;
 566         char value[PATH_SIZE];
 567         char *key_value;
 568         char *pos;
 569
 570         if (key->operation != KEY_OP_MATCH &&
 571             key->operation != KEY_OP_NOMATCH)
 572                 return 0;
 573
 574         strlcpy(value, rule->buf + key->val_off, sizeof(value));
 575         key_value = value;
 576
 577         dbg("key %s value='%s'", key_name, key_value);
 578         while (key_value) {
 579                 pos = strchr(key_value, '|');
 580                 if (pos) {
 581                         pos[0] = '\0';
 582                         pos++;
 583                 }
 584                 dbg("match %s '%s' <-> '%s'", key_name, key_value, val);
 585                 match = (strcmp_pattern(key_value, val) == 0);
 586                 if (match && (key->operation != KEY_OP_NOMATCH)) {
 587                         dbg("%s is true (matching value)", key_name);
 588                         return 0;
 589                 }
 590                 if (!match && (key->operation == KEY_OP_NOMATCH)) {
 591                         dbg("%s is true (non-matching value)", key_name);
 592                         return 0;
 593                 }
 594                 key_value = pos;
 595         }
 596         dbg("%s is false", key_name);
 597         return -1;
 598 }
 599
 600 /* match a single rule against a given device and possibly its parent devices */
 601 static int match_rule(struct udevice *udev, struct udev_rule *rule)
 602 {
 603         int i;
 604
 605         if (match_key("ACTION", rule, &rule->action, udev->action))
 606                 goto nomatch;
 607
 608         if (match_key("KERNEL", rule, &rule->kernel_name, udev->dev->kernel_name))
 609                 goto nomatch;
 610
 611         if (match_key("SUBSYSTEM", rule, &rule->subsystem, udev->dev->subsystem))
 612                 goto nomatch;
 613
 614         if (match_key("DEVPATH", rule, &rule->devpath, udev->dev->devpath))
 615                 goto nomatch;
 616
 617         /* compare NAME against a previously assigned value */
 618         if (match_key("NAME", rule, &rule->name, udev->name))
 619                 goto nomatch;
 620
 621         for (i = 0; i < rule->env.count; i++) {
 622                 struct key_pair *pair = &rule->env.keys[i];
 623
 624                 /* we only check for matches, assignments will be handled later */
 625                 if (pair->key.operation == KEY_OP_MATCH ||
 626                     pair->key.operation == KEY_OP_NOMATCH) {
 627                         const char *key_name = key_pair_name(rule, pair);
 628                         const char *value = getenv(key_name);
 629
 630                         if (!value) {
 631                                 dbg("ENV{'%s'} is not set, treat as empty", key_name);
 632                                 value = "";
 633                         }
 634                         if (match_key("ENV", rule, &pair->key, value))
 635                                 goto nomatch;
 636                 }
 637         }
 638
 639         if (rule->wait_for_sysfs.operation != KEY_OP_UNSET) {
 640                 int found;
 641
 642                 found = (wait_for_sysfs(udev, key_val(rule, &rule->wait_for_sysfs), 3) == 0);
 643                 if (!found && (rule->wait_for_sysfs.operation != KEY_OP_NOMATCH)) {
 644                         dbg("WAIT_FOR_SYSFS failed");
 645                         goto nomatch;
 646                 }
 647         }
 648
 649         /* walk up the chain of parent devices and find a match */
 650         udev->dev_parent = udev->dev;
 651         while (1) {
 652                 /* check for matching driver */
 653                 if (match_key("DRIVER", rule, &rule->driver, udev->dev_parent->driver))
 654                         goto try_parent;
 655
 656                 /* check for matching subsystem/bus value */
 657                 if (match_key("BUS", rule, &rule->bus, udev->dev_parent->subsystem))
 658                         goto try_parent;
 659
 660                 /* check for matching bus id (device name) */
 661                 if (match_key("ID", rule, &rule->id, udev->dev_parent->kernel_name))
 662                         goto try_parent;
 663
 664                 /* check for matching sysfs pairs */
 665                 if (rule->sysfs.count) {
 666                         dbg("check %i SYSFS keys", rule->sysfs.count);
 667                         for (i = 0; i < rule->sysfs.count; i++) {
 668                                 struct key_pair *pair = &rule->sysfs.keys[i];
 669                                 const char *key_name = key_pair_name(rule, pair);
 670                                 const char *key_value = key_val(rule, &pair->key);
 671                                 const char *value;
 672                                 char val[VALUE_SIZE];
 673                                 size_t len;
 674
 675                                 value = sysfs_attr_get_value(udev->dev_parent->devpath, key_name);
 676                                 if (value == NULL)
 677                                         value = sysfs_attr_get_value(udev->dev->devpath, key_name);
 678                                 if (value == NULL)
 679                                         goto try_parent;
 680                                 strlcpy(val, value, sizeof(val));
 681
 682                                 /* strip trailing whitespace of value, if not asked to match for it */
 683                                 len = strlen(key_value);
 684                                 if (len > 0 && !isspace(key_value[len-1])) {
 685                                         len = strlen(val);
 686                                         while (len > 0 && isspace(val[len-1]))
 687                                                 val[--len] = '\0';
 688                                         dbg("removed %zi trailing whitespace chars from '%s'", strlen(val)-len, val);
 689                                 }
 690
 691                                 if (match_key("SYSFS", rule, &pair->key, val))
 692                                         goto try_parent;
 693                         }
 694                         dbg("all %i SYSFS keys matched", rule->sysfs.count);
 695                 }
 696
 697                 /* found matching device  */
 698                 break;
 699 try_parent:
 700                 /* move to parent device */
 701                 dbg("try parent sysfs device");
 702                 udev->dev_parent = sysfs_device_get_parent(udev->dev_parent);
 703                 if (udev->dev_parent == NULL)
 704                         goto nomatch;
 705                 dbg("looking at dev_parent->devpath='%s'", udev->dev_parent->devpath);
 706                 dbg("looking at dev_parent->bus_kernel_name='%s'", udev->dev_parent->kernel_name);
 707         }
 708
 709         /* execute external program */
 710         if (rule->program.operation != KEY_OP_UNSET) {
 711                 char program[PATH_SIZE];
 712                 char result[PATH_SIZE];
 713
 714                 strlcpy(program, key_val(rule, &rule->program), sizeof(program));
 715                 udev_rules_apply_format(udev, program, sizeof(program));
 716                 if (run_program(program, udev->dev->subsystem, result, sizeof(result), NULL, (udev_log_priority >= LOG_INFO)) != 0) {
 717                         dbg("PROGRAM is false");
 718                         udev->program_result[0] = '\0';
 719                         if (rule->program.operation != KEY_OP_NOMATCH)
 720                                 goto nomatch;
 721                 } else {
 722                         int count;
 723
 724                         dbg("PROGRAM matches");
 725                         remove_trailing_chars(result, '\n');
 726                         count = replace_untrusted_chars(result);
 727                         if (count)
 728                                 info("%i untrusted character(s) replaced" , count);
 729                         dbg("result is '%s'", result);
 730                         strlcpy(udev->program_result, result, sizeof(udev->program_result));
 731                         dbg("PROGRAM returned successful");
 732                         if (rule->program.operation == KEY_OP_NOMATCH)
 733                                 goto nomatch;
 734                 }
 735                 dbg("PROGRAM key is true");
 736         }
 737
 738         /* check for matching result of external program */
 739         if (match_key("RESULT", rule, &rule->result, udev->program_result))
 740                 goto nomatch;
 741
 742         /* import variables returned from program or or file into environment */
 743         if (rule->import.operation != KEY_OP_UNSET) {
 744                 char import[PATH_SIZE];
 745                 int rc = -1;
 746
 747                 strlcpy(import, key_val(rule, &rule->import), sizeof(import));
 748                 udev_rules_apply_format(udev, import, sizeof(import));
 749                 dbg("check for IMPORT import='%s'", import);
 750                 if (rule->import_type == IMPORT_PROGRAM) {
 751                         rc = import_program_into_env(udev, import);
 752                 } else if (rule->import_type == IMPORT_FILE) {
 753                         dbg("import file import='%s'", import);
 754                         rc = import_file_into_env(udev, import);
 755                 } else if (rule->import_type == IMPORT_PARENT) {
 756                         dbg("import parent import='%s'", import);
 757                         rc = import_parent_into_env(udev, import);
 758                 }
 759                 if (rc != 0) {
 760                         dbg("IMPORT failed");
 761                         if (rule->import.operation != KEY_OP_NOMATCH)
 762                                 goto nomatch;
 763                 } else
 764                         dbg("IMPORT '%s' imported", key_val(rule, &rule->import));
 765                 dbg("IMPORT key is true");
 766         }
 767
 768         /* rule matches, if we have ENV assignments export it */
 769         for (i = 0; i < rule->env.count; i++) {
 770                 struct key_pair *pair = &rule->env.keys[i];
 771
 772                 if (pair->key.operation == KEY_OP_ASSIGN) {
 773                         const char *key_name = key_pair_name(rule, pair);
 774                         const char *value = key_val(rule, &pair->key);
 775                         char *key_value = name_list_key_add(&udev->env_list, key_name, value);
 776                         if (key_value == NULL)
 777                                 break;
 778
 779                         udev_rules_apply_format(udev, key_value, NAME_SIZE);
 780                         putenv(key_value);
 781                         dbg("export ENV '%s'", key_value);
 782                 }
 783         }
 784
 785         return 0;
 786
 787 nomatch:
 788         return -1;
 789 }
 790
 791 int udev_rules_get_name(struct udev_rules *rules, struct udevice *udev)
 792 {
 793         struct udev_rule *rule;
 794         int name_set = 0;
 795
 796         dbg("udev->dev->devpath='%s'", udev->dev->devpath);
 797         dbg("udev->dev->kernel_name='%s'", udev->dev->kernel_name);
 798
 799         /* look for a matching rule to apply */
 800         udev_rules_iter_init(rules);
 801         while (1) {
 802                 rule = udev_rules_iter_next(rules);
 803                 if (rule == NULL)
 804                         break;
 805
 806                 if (name_set &&
 807                     (rule->name.operation == KEY_OP_ASSIGN ||
 808                      rule->name.operation == KEY_OP_ASSIGN_FINAL ||
 809                      rule->name.operation == KEY_OP_ADD)) {
 810                         dbg("node name already set, rule ignored");
 811                         continue;
 812                 }
 813
 814                 dbg("process rule");
 815                 if (match_rule(udev, rule) == 0) {
 816                         /* apply options */
 817                         if (rule->ignore_device) {
 818                                 info("rule applied, '%s' is ignored", udev->dev->kernel_name);
 819                                 udev->ignore_device = 1;
 820                                 return 0;
 821                         }
 822                         if (rule->ignore_remove) {
 823                                 udev->ignore_remove = 1;
 824                                 dbg("remove event should be ignored");
 825                         }
 826                         /* apply all_partitions option only at a main block device */
 827                         if (rule->partitions &&
 828                             strcmp(udev->dev->subsystem, "block") == 0 && udev->dev->kernel_number[0] == '\0') {
 829                                 udev->partitions = rule->partitions;
 830                                 dbg("creation of partition nodes requested");
 831                         }
 832
 833                         /* apply permissions */
 834                         if (!udev->mode_final && rule->mode != 0000) {
 835                                 if (rule->mode_operation == KEY_OP_ASSIGN_FINAL)
 836                                         udev->mode_final = 1;
 837                                 udev->mode = rule->mode;
 838                                 dbg("applied mode=%#o to '%s'", rule->mode, udev->dev->kernel_name);
 839                         }
 840                         if (!udev->owner_final && rule->owner.operation != KEY_OP_UNSET) {
 841                                 if (rule->owner.operation == KEY_OP_ASSIGN_FINAL)
 842                                         udev->owner_final = 1;
 843                                 strlcpy(udev->owner, key_val(rule, &rule->owner), sizeof(udev->owner));
 844                                 udev_rules_apply_format(udev, udev->owner, sizeof(udev->owner));
 845                                 dbg("applied owner='%s' to '%s'", udev->owner, udev->dev->kernel_name);
 846                         }
 847                         if (!udev->group_final && rule->group.operation != KEY_OP_UNSET) {
 848                                 if (rule->group.operation == KEY_OP_ASSIGN_FINAL)
 849                                         udev->group_final = 1;
 850                                 strlcpy(udev->group, key_val(rule, &rule->group), sizeof(udev->group));
 851                                 udev_rules_apply_format(udev, udev->group, sizeof(udev->group));
 852                                 dbg("applied group='%s' to '%s'", udev->group, udev->dev->kernel_name);
 853                         }
 854
 855                         /* collect symlinks */
 856                         if (!udev->symlink_final && rule->symlink.operation != KEY_OP_UNSET) {
 857                                 char temp[PATH_SIZE];
 858                                 char *pos, *next;
 859                                 int count;
 860
 861                                 if (rule->symlink.operation == KEY_OP_ASSIGN_FINAL)
 862                                         udev->symlink_final = 1;
 863                                 if (rule->symlink.operation == KEY_OP_ASSIGN || rule->symlink.operation == KEY_OP_ASSIGN_FINAL) {
 864                                         info("reset symlink list");
 865                                         name_list_cleanup(&udev->symlink_list);
 866                                 }
 867                                 strlcpy(temp, key_val(rule, &rule->symlink), sizeof(temp));
 868                                 udev_rules_apply_format(udev, temp, sizeof(temp));
 869                                 count = replace_untrusted_chars(temp);
 870                                 if (count)
 871                                         info("%i untrusted character(s) replaced" , count);
 872                                 dbg("rule applied, added symlink(s) '%s'", temp);
 873
 874                                 /* add multiple symlinks separated by spaces */
 875                                 pos = temp;
 876                                 while (isspace(pos[0]))
 877                                         pos++;
 878                                 next = strchr(pos, ' ');
 879                                 while (next) {
 880                                         next[0] = '\0';
 881                                         info("add symlink '%s'", pos);
 882                                         name_list_add(&udev->symlink_list, pos, 0);
 883                                         while (isspace(next[1]))
 884                                                 next++;
 885                                         pos = &next[1];
 886                                         next = strchr(pos, ' ');
 887                                 }
 888                                 if (pos[0] != '\0') {
 889                                         info("add symlink '%s'", pos);
 890                                         name_list_add(&udev->symlink_list, pos, 0);
 891                                 }
 892                         }
 893
 894                         /* set name, later rules with name set will be ignored */
 895                         if (rule->name.operation == KEY_OP_ASSIGN ||
 896                             rule->name.operation == KEY_OP_ASSIGN_FINAL ||
 897                             rule->name.operation == KEY_OP_ADD) {
 898                                 int count;
 899
 900                                 name_set = 1;
 901                                 strlcpy(udev->name, key_val(rule, &rule->name), sizeof(udev->name));
 902                                 udev_rules_apply_format(udev, udev->name, sizeof(udev->name));
 903                                 count = replace_untrusted_chars(udev->name);
 904                                 if (count)
 905                                         info("%i untrusted character(s) replaced", count);
 906
 907                                 info("rule applied, '%s' becomes '%s'", udev->dev->kernel_name, udev->name);
 908                                 if (strcmp(udev->dev->subsystem, "net") != 0)
 909                                         dbg("name, '%s' is going to have owner='%s', group='%s', mode=%#o partitions=%i",
 910                                             udev->name, udev->owner, udev->group, udev->mode, udev->partitions);
 911                         }
 912
 913                         if (!udev->run_final && rule->run.operation != KEY_OP_UNSET) {
 914                                 if (rule->run.operation == KEY_OP_ASSIGN_FINAL)
 915                                         udev->run_final = 1;
 916                                 if (rule->run.operation == KEY_OP_ASSIGN || rule->run.operation == KEY_OP_ASSIGN_FINAL) {
 917                                         info("reset run list");
 918                                         name_list_cleanup(&udev->run_list);
 919                                 }
 920                                 dbg("add run '%s'", key_val(rule, &rule->run));
 921                                 name_list_add(&udev->run_list, key_val(rule, &rule->run), 0);
 922                         }
 923
 924                         if (rule->last_rule) {
 925                                 dbg("last rule to be applied");
 926                                 break;
 927                         }
 928
 929                         if (rule->goto_label.operation != KEY_OP_UNSET) {
 930                                 dbg("moving forward to label '%s'", key_val(rule, &rule->goto_label));
 931                                 udev_rules_iter_label(rules, key_val(rule, &rule->goto_label));
 932                         }
 933                 }
 934         }
 935
 936         if (!name_set) {
 937                 strlcpy(udev->name, udev->dev->kernel_name, sizeof(udev->name));
 938                 info("no node name set, will use kernel name '%s'", udev->name);
 939         }
 940
 941         if (udev->tmp_node[0] != '\0') {
 942                 dbg("removing temporary device node");
 943                 unlink_secure(udev->tmp_node);
 944                 udev->tmp_node[0] = '\0';
 945         }
 946
 947         return 0;
 948 }
 949
 950 int udev_rules_get_run(struct udev_rules *rules, struct udevice *udev)
 951 {
 952         struct udev_rule *rule;
 953
 954         dbg("udev->kernel_name='%s'", udev->dev->kernel_name);
 955
 956         /* look for a matching rule to apply */
 957         udev_rules_iter_init(rules);
 958         while (1) {
 959                 rule = udev_rules_iter_next(rules);
 960                 if (rule == NULL)
 961                         break;
 962
 963                 dbg("process rule");
 964                 if (rule->name.operation != KEY_OP_UNSET || rule->symlink.operation != KEY_OP_UNSET ||
 965                     rule->mode_operation != KEY_OP_UNSET || rule->owner.operation != KEY_OP_UNSET || rule->group.operation != KEY_OP_UNSET) {
 966                         dbg("skip rule that names a device");
 967                         continue;
 968                 }
 969
 970                 if (match_rule(udev, rule) == 0) {
 971                         if (rule->ignore_device) {
 972                                 info("rule applied, '%s' is ignored", udev->dev->kernel_name);
 973                                 udev->ignore_device = 1;
 974                                 return 0;
 975                         }
 976
 977                         if (!udev->run_final && rule->run.operation != KEY_OP_UNSET) {
 978                                 if (rule->run.operation == KEY_OP_ASSIGN || rule->run.operation == KEY_OP_ASSIGN_FINAL) {
 979                                         info("reset run list");
 980                                         name_list_cleanup(&udev->run_list);
 981                                 }
 982                                 dbg("add run '%s'", key_val(rule, &rule->run));
 983                                 name_list_add(&udev->run_list, key_val(rule, &rule->run), 0);
 984                                 if (rule->run.operation == KEY_OP_ASSIGN_FINAL)
 985                                         break;
 986                         }
 987
 988                         if (rule->last_rule) {
 989                                 dbg("last rule to be applied");
 990                                 break;
 991                         }
 992
 993                         if (rule->goto_label.operation != KEY_OP_UNSET) {
 994                                 dbg("moving forward to label '%s'", key_val(rule, &rule->goto_label));
 995                                 udev_rules_iter_label(rules, key_val(rule, &rule->goto_label));
 996                         }
 997                 }
 998         }
 999
1000         return 0;
1001 }