udev_rules.c

   1 /*
   2  * udev_rules.c
   3  *
   4  * Userspace devfs
   5  *
   6  * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
   7  * Copyright (C) 2003-2005 Kay Sievers <kay.sievers@vrfy.org>
   8  *
   9  *
  10  *      This program is free software; you can redistribute it and/or modify it
  11  *      under the terms of the GNU General Public License as published by the
  12  *      Free Software Foundation version 2 of the License.
  13  *
  14  *      This program is distributed in the hope that it will be useful, but
  15  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *      General Public License for more details.
  18  *
  19  *      You should have received a copy of the GNU General Public License along
  20  *      with this program; if not, write to the Free Software Foundation, Inc.,
  21  *      675 Mass Ave, Cambridge, MA 02139, USA.
  22  *
  23  */
  24
  25 #include <stddef.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <stdio.h>
  29 #include <fcntl.h>
  30 #include <ctype.h>
  31 #include <unistd.h>
  32 #include <errno.h>
  33 #include <sys/wait.h>
  34
  35 #include "libsysfs/sysfs/libsysfs.h"
  36 #include "list.h"
  37 #include "udev_libc_wrapper.h"
  38 #include "udev.h"
  39 #include "udev_utils.h"
  40 #include "udev_version.h"
  41 #include "logging.h"
  42 #include "udev_rules.h"
  43 #include "udev_db.h"
  44
  45
  46 /* compare string with pattern (supports * ? [0-9] [!A-Z]) */
  47 static int strcmp_pattern(const char *p, const char *s)
  48 {
  49         if (s[0] == '\0') {
  50                 while (p[0] == '*')
  51                         p++;
  52                 return (p[0] != '\0');
  53         }
  54         switch (p[0]) {
  55         case '[':
  56                 {
  57                         int not = 0;
  58                         p++;
  59                         if (p[0] == '!') {
  60                                 not = 1;
  61                                 p++;
  62                         }
  63                         while ((p[0] != '\0') && (p[0] != ']')) {
  64                                 int match = 0;
  65                                 if (p[1] == '-') {
  66                                         if ((s[0] >= p[0]) && (s[0] <= p[2]))
  67                                                 match = 1;
  68                                         p += 3;
  69                                 } else {
  70                                         match = (p[0] == s[0]);
  71                                         p++;
  72                                 }
  73                                 if (match ^ not) {
  74                                         while ((p[0] != '\0') && (p[0] != ']'))
  75                                                 p++;
  76                                         if (p[0] == ']')
  77                                                 return strcmp_pattern(p+1, s+1);
  78                                 }
  79                         }
  80                 }
  81                 break;
  82         case '*':
  83                 if (strcmp_pattern(p, s+1))
  84                         return strcmp_pattern(p+1, s);
  85                 return 0;
  86         case '\0':
  87                 if (s[0] == '\0') {
  88                         return 0;
  89                 }
  90                 break;
  91         default:
  92                 if ((p[0] == s[0]) || (p[0] == '?'))
  93                         return strcmp_pattern(p+1, s+1);
  94                 break;
  95         }
  96         return 1;
  97 }
  98
  99 /* extract possible {attr} and move str behind it */
 100 static char *get_format_attribute(char **str)
 101 {
 102         char *pos;
 103         char *attr = NULL;
 104
 105         if (*str[0] == '{') {
 106                 pos = strchr(*str, '}');
 107                 if (pos == NULL) {
 108                         err("missing closing brace for format");
 109                         return NULL;
 110                 }
 111                 pos[0] = '\0';
 112                 attr = *str+1;
 113                 *str = pos+1;
 114                 dbg("attribute='%s', str='%s'", attr, *str);
 115         }
 116         return attr;
 117 }
 118
 119 /* extract possible format length and move str behind it*/
 120 static int get_format_len(char **str)
 121 {
 122         int num;
 123         char *tail;
 124
 125         if (isdigit(*str[0])) {
 126                 num = (int) strtoul(*str, &tail, 10);
 127                 if (num > 0) {
 128                         *str = tail;
 129                         dbg("format length=%i", num);
 130                         return num;
 131                 } else {
 132                         err("format parsing error '%s'", *str);
 133                 }
 134         }
 135         return -1;
 136 }
 137
 138 static int get_key(char **line, char **key, char **value)
 139 {
 140         char *linepos;
 141         char *temp;
 142
 143         linepos = *line;
 144         if (!linepos)
 145                 return -1;
 146
 147         if (strchr(linepos, '\\')) {
 148                 dbg("escaped characters are not supported, skip");
 149                 return -1;
 150         }
 151
 152         /* skip whitespace */
 153         while (isspace(linepos[0]))
 154                 linepos++;
 155
 156         /* get the key */
 157         *key = linepos;
 158         while (1) {
 159                 linepos++;
 160                 if (linepos[0] == '\0')
 161                         return -1;
 162                 if (isspace(linepos[0]))
 163                         break;
 164                 if (linepos[0] == '=')
 165                         break;
 166         }
 167
 168         /* terminate key */
 169         linepos[0] = '\0';
 170         linepos++;
 171
 172         /* skip whitespace */
 173         while (isspace(linepos[0]))
 174                 linepos++;
 175
 176         /* get the value*/
 177         if (linepos[0] == '\0')
 178                 return -1;
 179
 180         if (linepos[0] == '"') {
 181                 linepos++;
 182                 temp = strchr(linepos, '"');
 183                 if (!temp)
 184                         return -1;
 185                 temp[0] = '\0';
 186         } else if (linepos[0] == '\'') {
 187                 linepos++;
 188                 temp = strchr(linepos, '\'');
 189                 if (!temp)
 190                         return -1;
 191                 temp[0] = '\0';
 192         } else {
 193                 temp = linepos;
 194                 while (temp[0] && !isspace(temp[0]))
 195                         temp++;
 196                 temp[0] = '\0';
 197         }
 198         *value = linepos;
 199
 200         return 0;
 201 }
 202
 203 static int import_keys_into_env(const char *buf, size_t bufsize)
 204 {
 205         char line[LINE_SIZE];
 206         const char *bufline;
 207         char *linepos;
 208         char *variable;
 209         char *value;
 210         size_t cur;
 211         size_t count;
 212         int lineno;
 213
 214         /* loop through the whole file */
 215         lineno = 0;
 216         cur = 0;
 217         while (cur < bufsize) {
 218                 count = buf_get_line(buf, bufsize, cur);
 219                 bufline = &buf[cur];
 220                 cur += count+1;
 221                 lineno++;
 222
 223                 if (count >= sizeof(line)) {
 224                         err("line too long, conf line skipped %s, line %d", udev_config_filename, lineno);
 225                         continue;
 226                 }
 227
 228                 /* eat the whitespace */
 229                 while ((count > 0) && isspace(bufline[0])) {
 230                         bufline++;
 231                         count--;
 232                 }
 233                 if (count == 0)
 234                         continue;
 235
 236                 /* see if this is a comment */
 237                 if (bufline[0] == COMMENT_CHARACTER)
 238                         continue;
 239
 240                 strlcpy(line, bufline, count+1);
 241
 242                 linepos = line;
 243                 if (get_key(&linepos, &variable, &value) == 0) {
 244                         dbg("import %s=%s", variable, value);
 245                         setenv(variable, value, 0);
 246                 }
 247         }
 248
 249         return 0;
 250 }
 251
 252 static int import_file_into_env(const char *filename)
 253 {
 254         char *buf;
 255         size_t bufsize;
 256
 257         if (file_map(filename, &buf, &bufsize) != 0) {
 258                 err("can't open '%s'", filename);
 259                 return -1;
 260         }
 261         import_keys_into_env(buf, bufsize);
 262         file_unmap(buf, bufsize);
 263
 264         return 0;
 265 }
 266
 267 /** Finds the lowest positive N such that <name>N isn't present in
 268  *  $(udevroot) either as a file or a symlink.
 269  *
 270  *  @param  name                Name to check for
 271  *  @return                     0 if <name> didn't exist and N otherwise.
 272  */
 273 static int find_free_number(struct udevice *udev, const char *name)
 274 {
 275         char devpath[PATH_SIZE];
 276         char filename[PATH_SIZE];
 277         int num = 0;
 278
 279         strlcpy(filename, name, sizeof(filename));
 280         while (1) {
 281                 dbg("look for existing node '%s'", filename);
 282                 if (udev_db_search_name(devpath, sizeof(devpath), filename) != 0) {
 283                         dbg("free num=%d", num);
 284                         return num;
 285                 }
 286
 287                 num++;
 288                 if (num > 1000) {
 289                         info("find_free_number gone crazy (num=%d), aborted", num);
 290                         return -1;
 291                 }
 292                 snprintf(filename, sizeof(filename), "%s%d", name, num);
 293                 filename[sizeof(filename)-1] = '\0';
 294         }
 295 }
 296
 297 static int find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device,
 298                                 const char *name, char *value, size_t len)
 299 {
 300         struct sysfs_attribute *tmpattr;
 301
 302         dbg("look for device attribute '%s'", name);
 303         if (class_dev) {
 304                 dbg("look for class attribute '%s/%s'", class_dev->path, name);
 305                 tmpattr = sysfs_get_classdev_attr(class_dev, name);
 306                 if (tmpattr)
 307                         goto attr_found;
 308         }
 309         if (sysfs_device) {
 310                 dbg("look for devices attribute '%s/%s'", sysfs_device->path, name);
 311                 tmpattr = sysfs_get_device_attr(sysfs_device, name);
 312                 if (tmpattr)
 313                         goto attr_found;
 314         }
 315         return -1;
 316
 317 attr_found:
 318         strlcpy(value, tmpattr->value, len);
 319         remove_trailing_char(value, '\n');
 320
 321         dbg("found attribute '%s'", tmpattr->path);
 322         return 0;
 323 }
 324
 325 static void apply_format(struct udevice *udev, char *string, size_t maxsize,
 326                          struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 327 {
 328         char temp[PATH_SIZE];
 329         char temp2[PATH_SIZE];
 330         char *head, *tail, *pos, *cpos, *attr, *rest;
 331         int len;
 332         int i;
 333         unsigned int next_free_number;
 334         struct sysfs_class_device *class_dev_parent;
 335         enum subst_type {
 336                 SUBST_UNKNOWN,
 337                 SUBST_DEVPATH,
 338                 SUBST_ID,
 339                 SUBST_KERNEL_NUMBER,
 340                 SUBST_KERNEL_NAME,
 341                 SUBST_MAJOR,
 342                 SUBST_MINOR,
 343                 SUBST_RESULT,
 344                 SUBST_SYSFS,
 345                 SUBST_ENUM,
 346                 SUBST_PARENT,
 347                 SUBST_TEMP_NODE,
 348                 SUBST_ROOT,
 349                 SUBST_MODALIAS,
 350                 SUBST_ENV,
 351         };
 352         static const struct subst_map {
 353                 char *name;
 354                 char fmt;
 355                 enum subst_type type;
 356         } map[] = {
 357                 { .name = "devpath",            .fmt = 'p',     .type = SUBST_DEVPATH },
 358                 { .name = "id",                 .fmt = 'b',     .type = SUBST_ID },
 359                 { .name = "number",             .fmt = 'n',     .type = SUBST_KERNEL_NUMBER },
 360                 { .name = "kernel",             .fmt = 'k',     .type = SUBST_KERNEL_NAME },
 361                 { .name = "major",              .fmt = 'M',     .type = SUBST_MAJOR },
 362                 { .name = "minor",              .fmt = 'm',     .type = SUBST_MINOR },
 363                 { .name = "result",             .fmt = 'c',     .type = SUBST_RESULT },
 364                 { .name = "sysfs",              .fmt = 's',     .type = SUBST_SYSFS },
 365                 { .name = "enum",               .fmt = 'e',     .type = SUBST_ENUM },
 366                 { .name = "parent",             .fmt = 'P',     .type = SUBST_PARENT },
 367                 { .name = "tempnode",           .fmt = 'N',     .type = SUBST_TEMP_NODE },
 368                 { .name = "root",               .fmt = 'r',     .type = SUBST_ROOT },
 369                 { .name = "modalias",           .fmt = 'A',     .type = SUBST_MODALIAS },
 370                 { .name = "env",                .fmt = 'E',     .type = SUBST_ENV },
 371                 {}
 372         };
 373         enum subst_type type;
 374         const struct subst_map *subst;
 375
 376         head = string;
 377         while (1) {
 378                 len = -1;
 379                 while (head[0] != '\0') {
 380                         if (head[0] == '$') {
 381                                 /* substitute named variable */
 382                                 if (head[1] == '\0')
 383                                         break;
 384                                 if (head[1] == '$') {
 385                                         strlcpy(temp, head+2, sizeof(temp));
 386                                         strlcpy(head+1, temp, maxsize);
 387                                         head++;
 388                                         continue;
 389                                 }
 390                                 head[0] = '\0';
 391                                 for (subst = map; subst->name; subst++) {
 392                                         if (strncasecmp(&head[1], subst->name, strlen(subst->name)) == 0) {
 393                                                 type = subst->type;
 394                                                 tail = head + strlen(subst->name)+1;
 395                                                 dbg("will substitute format name '%s'", subst->name);
 396                                                 goto found;
 397                                         }
 398                                 }
 399                         }
 400                         else if (head[0] == '%') {
 401                                 /* substitute format char */
 402                                 if (head[1] == '\0')
 403                                         break;
 404                                 if (head[1] == '%') {
 405                                         strlcpy(temp, head+2, sizeof(temp));
 406                                         strlcpy(head+1, temp, maxsize);
 407                                         head++;
 408                                         continue;
 409                                 }
 410                                 head[0] = '\0';
 411                                 tail = head+1;
 412                                 len = get_format_len(&tail);
 413                                 for (subst = map; subst->name; subst++) {
 414                                         if (tail[0] == subst->fmt) {
 415                                                 type = subst->type;
 416                                                 tail++;
 417                                                 dbg("will substitute format char '%c'", subst->fmt);
 418                                                 goto found;
 419                                         }
 420                                 }
 421                         }
 422                         head++;
 423                 }
 424                 break;
 425 found:
 426                 attr = get_format_attribute(&tail);
 427                 strlcpy(temp, tail, sizeof(temp));
 428                 dbg("format=%i, string='%s', tail='%s', class_dev=%p, sysfs_dev=%p",
 429                     type ,string, tail, class_dev, sysfs_device);
 430
 431                 switch (type) {
 432                 case SUBST_DEVPATH:
 433                         strlcat(string, udev->devpath, maxsize);
 434                         dbg("substitute devpath '%s'", udev->devpath);
 435                         break;
 436                 case SUBST_ID:
 437                         strlcat(string, udev->bus_id, maxsize);
 438                         dbg("substitute bus_id '%s'", udev->bus_id);
 439                         break;
 440                 case SUBST_KERNEL_NAME:
 441                         strlcat(string, udev->kernel_name, maxsize);
 442                         dbg("substitute kernel name '%s'", udev->kernel_name);
 443                         break;
 444                 case SUBST_KERNEL_NUMBER:
 445                         strlcat(string, udev->kernel_number, maxsize);
 446                         dbg("substitute kernel number '%s'", udev->kernel_number);
 447                         break;
 448                 case SUBST_MAJOR:
 449                         sprintf(temp2, "%d", major(udev->devt));
 450                         strlcat(string, temp2, maxsize);
 451                         dbg("substitute major number '%s'", temp2);
 452                         break;
 453                 case SUBST_MINOR:
 454                         sprintf(temp2, "%d", minor(udev->devt));
 455                         strlcat(string, temp2, maxsize);
 456                         dbg("substitute minor number '%s'", temp2);
 457                         break;
 458                 case SUBST_RESULT:
 459                         if (udev->program_result[0] == '\0')
 460                                 break;
 461                         /* get part part of the result string */
 462                         i = 0;
 463                         if (attr != NULL)
 464                                 i = strtoul(attr, &rest, 10);
 465                         if (i > 0) {
 466                                 dbg("request part #%d of result string", i);
 467                                 cpos = udev->program_result;
 468                                 while (--i) {
 469                                         while (cpos[0] != '\0' && !isspace(cpos[0]))
 470                                                 cpos++;
 471                                         while (isspace(cpos[0]))
 472                                                 cpos++;
 473                                 }
 474                                 if (i > 0) {
 475                                         err("requested part of result string not found");
 476                                         break;
 477                                 }
 478                                 strlcpy(temp2, cpos, sizeof(temp2));
 479                                 /* %{2+}c copies the whole string from the second part on */
 480                                 if (rest[0] != '+') {
 481                                         cpos = strchr(temp2, ' ');
 482                                         if (cpos)
 483                                                 cpos[0] = '\0';
 484                                 }
 485                                 strlcat(string, temp2, maxsize);
 486                                 dbg("substitute part of result string '%s'", temp2);
 487                         } else {
 488                                 strlcat(string, udev->program_result, maxsize);
 489                                 dbg("substitute result string '%s'", udev->program_result);
 490                         }
 491                         break;
 492                 case SUBST_SYSFS:
 493                         if (attr == NULL) {
 494                                 dbg("missing attribute");
 495                                 break;
 496                         }
 497                         if (find_sysfs_attribute(class_dev, sysfs_device, attr, temp2, sizeof(temp2)) != 0) {
 498                                 struct sysfs_device *parent_device;
 499
 500                                 dbg("sysfs attribute '%s' not found, walk up the physical devices", attr);
 501                                 parent_device = sysfs_get_device_parent(sysfs_device);
 502                                 while (parent_device) {
 503                                         dbg("looking at '%s'", parent_device->path);
 504                                         if (find_sysfs_attribute(NULL, parent_device, attr, temp2, sizeof(temp2)) == 0)
 505                                                 break;
 506                                         parent_device = sysfs_get_device_parent(parent_device);
 507                                 }
 508                                 if (!parent_device)
 509                                         break;
 510                         }
 511                         /* strip trailing whitespace of sysfs value */
 512                         i = strlen(temp2);
 513                         while (i > 0 && isspace(temp2[i-1]))
 514                                 temp2[--i] = '\0';
 515                         replace_untrusted_chars(temp2);
 516                         strlcat(string, temp2, maxsize);
 517                         dbg("substitute sysfs value '%s'", temp2);
 518                         break;
 519                 case SUBST_ENUM:
 520                         next_free_number = find_free_number(udev, string);
 521                         if (next_free_number > 0) {
 522                                 sprintf(temp2, "%d", next_free_number);
 523                                 strlcat(string, temp2, maxsize);
 524                         }
 525                         break;
 526                 case SUBST_PARENT:
 527                         if (!class_dev)
 528                                 break;
 529                         class_dev_parent = sysfs_get_classdev_parent(class_dev);
 530                         if (class_dev_parent != NULL) {
 531                                 struct udevice udev_parent;
 532
 533                                 dbg("found parent '%s', get the node name", class_dev_parent->path);
 534                                 udev_init_device(&udev_parent, NULL, NULL, NULL);
 535                                 /* lookup the name in the udev_db with the DEVPATH of the parent */
 536                                 if (udev_db_get_device(&udev_parent, &class_dev_parent->path[strlen(sysfs_path)]) == 0) {
 537                                         strlcat(string, udev_parent.name, maxsize);
 538                                         dbg("substitute parent node name'%s'", udev_parent.name);
 539                                 } else
 540                                         dbg("parent not found in database");
 541                                 udev_cleanup_device(&udev_parent);
 542                         }
 543                         break;
 544                 case SUBST_TEMP_NODE:
 545                         if (udev->tmp_node[0] == '\0') {
 546                                 dbg("create temporary device node for callout");
 547                                 snprintf(udev->tmp_node, sizeof(udev->tmp_node), "%s/.tmp-%u-%u",
 548                                          udev_root, major(udev->devt), minor(udev->devt));
 549                                 udev->tmp_node[sizeof(udev->tmp_node)-1] = '\0';
 550                                 udev_make_node(udev, udev->tmp_node, udev->devt, 0600, 0, 0);
 551                         }
 552                         strlcat(string, udev->tmp_node, maxsize);
 553                         dbg("substitute temporary device node name '%s'", udev->tmp_node);
 554                         break;
 555                 case SUBST_ROOT:
 556                         strlcat(string, udev_root, maxsize);
 557                         dbg("substitute udev_root '%s'", udev_root);
 558                         break;
 559                 case SUBST_MODALIAS:
 560                         if (find_sysfs_attribute(NULL, sysfs_device, "modalias", temp2, sizeof(temp2)) != 0)
 561                                 break;
 562                         strlcat(string, temp2, maxsize);
 563                         dbg("substitute MODALIAS '%s'", temp2);
 564                         break;
 565                 case SUBST_ENV:
 566                         if (attr == NULL) {
 567                                 dbg("missing attribute");
 568                                 break;
 569                         }
 570                         pos = getenv(attr);
 571                         if (pos == NULL)
 572                                 break;
 573                         strlcat(string, pos, maxsize);
 574                         dbg("substitute env '%s=%s'", attr, pos);
 575                         break;
 576                 default:
 577                         err("unknown substitution type=%i", type);
 578                         break;
 579                 }
 580                 /* possibly truncate to format-char specified length */
 581                 if (len != -1) {
 582                         head[len] = '\0';
 583                         dbg("truncate to %i chars, subtitution string becomes '%s'", len, head);
 584                 }
 585                 strlcat(string, temp, maxsize);
 586         }
 587 }
 588
 589 static int match_rule(struct udevice *udev, struct udev_rule *rule,
 590                       struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 591 {
 592         struct sysfs_device *parent_device = sysfs_device;
 593
 594         if (rule->action_operation != KEY_OP_UNSET) {
 595                 dbg("check for " KEY_ACTION " rule->action='%s' udev->action='%s'",
 596                     rule->action, udev->action);
 597                 if (strcmp_pattern(rule->action, udev->action) != 0) {
 598                         dbg(KEY_ACTION " is not matching");
 599                         if (rule->action_operation != KEY_OP_NOMATCH)
 600                                 goto exit;
 601                 } else {
 602                         dbg(KEY_ACTION " matches");
 603                         if (rule->action_operation == KEY_OP_NOMATCH)
 604                                 goto exit;
 605                 }
 606                 dbg(KEY_ACTION " key is true");
 607         }
 608
 609         if (rule->kernel_operation != KEY_OP_UNSET) {
 610                 dbg("check for " KEY_KERNEL " rule->kernel='%s' udev_kernel_name='%s'",
 611                     rule->kernel, udev->kernel_name);
 612                 if (strcmp_pattern(rule->kernel, udev->kernel_name) != 0) {
 613                         dbg(KEY_KERNEL " is not matching");
 614                         if (rule->kernel_operation != KEY_OP_NOMATCH)
 615                                 goto exit;
 616                 } else {
 617                         dbg(KEY_KERNEL " matches");
 618                         if (rule->kernel_operation == KEY_OP_NOMATCH)
 619                                 goto exit;
 620                 }
 621                 dbg(KEY_KERNEL " key is true");
 622         }
 623
 624         if (rule->subsystem_operation != KEY_OP_UNSET) {
 625                 dbg("check for " KEY_SUBSYSTEM " rule->subsystem='%s' udev->subsystem='%s'",
 626                     rule->subsystem, udev->subsystem);
 627                 if (strcmp_pattern(rule->subsystem, udev->subsystem) != 0) {
 628                         dbg(KEY_SUBSYSTEM " is not matching");
 629                         if (rule->subsystem_operation != KEY_OP_NOMATCH)
 630                                 goto exit;
 631                 } else {
 632                         dbg(KEY_SUBSYSTEM " matches");
 633                         if (rule->subsystem_operation == KEY_OP_NOMATCH)
 634                                 goto exit;
 635                 }
 636                 dbg(KEY_SUBSYSTEM " key is true");
 637         }
 638
 639         if (rule->devpath_operation != KEY_OP_UNSET) {
 640                 dbg("check for " KEY_DEVPATH " rule->devpath='%s' udev->devpath='%s'",
 641                     rule->devpath, udev->devpath);
 642                 if (strcmp_pattern(rule->devpath, udev->devpath) != 0) {
 643                         dbg(KEY_DEVPATH " is not matching");
 644                         if (rule->devpath_operation != KEY_OP_NOMATCH)
 645                                 goto exit;
 646                 } else {
 647                         dbg(KEY_DEVPATH " matches");
 648                         if (rule->devpath_operation == KEY_OP_NOMATCH)
 649                                 goto exit;
 650                 }
 651                 dbg(KEY_DEVPATH " key is true");
 652         }
 653
 654         if (rule->modalias_operation != KEY_OP_UNSET) {
 655                 char value[NAME_SIZE];
 656
 657                 if (find_sysfs_attribute(NULL, sysfs_device, "modalias", value, sizeof(value)) != 0) {
 658                         dbg(KEY_MODALIAS " value not found");
 659                         goto exit;
 660                 }
 661                 dbg("check for " KEY_MODALIAS " rule->modalias='%s' modalias='%s'",
 662                     rule->modalias, value);
 663                 if (strcmp_pattern(rule->modalias, value) != 0) {
 664                         dbg(KEY_MODALIAS " is not matching");
 665                         if (rule->modalias_operation != KEY_OP_NOMATCH)
 666                                 goto exit;
 667                 } else {
 668                         dbg(KEY_MODALIAS " matches");
 669                         if (rule->modalias_operation == KEY_OP_NOMATCH)
 670                                 goto exit;
 671                 }
 672                 dbg(KEY_MODALIAS " key is true");
 673         }
 674
 675         if (rule->env_pair_count) {
 676                 int i;
 677
 678                 dbg("check for " KEY_ENV " pairs");
 679                 for (i = 0; i < rule->env_pair_count; i++) {
 680                         struct key_pair *pair;
 681                         const char *value;
 682
 683                         pair = &rule->env_pair[i];
 684                         value = getenv(pair->name);
 685                         if (!value) {
 686                                 dbg(KEY_ENV "{'%s'} is not found", pair->name);
 687                                 goto exit;
 688                         }
 689                         if (strcmp_pattern(pair->value, value) != 0) {
 690                                 dbg(KEY_ENV "{'%s'} is not matching", pair->name);
 691                                 if (pair->operation != KEY_OP_NOMATCH)
 692                                         goto exit;
 693                         } else {
 694                                 dbg(KEY_ENV "{'%s'} matches", pair->name);
 695                                 if (pair->operation == KEY_OP_NOMATCH)
 696                                         goto exit;
 697                         }
 698                 }
 699                 dbg(KEY_ENV " key is true");
 700         }
 701
 702         /* walk up the chain of physical devices and find a match */
 703         while (1) {
 704                 /* check for matching driver */
 705                 if (rule->driver_operation != KEY_OP_UNSET) {
 706                         if (parent_device == NULL) {
 707                                 dbg("device has no sysfs_device");
 708                                 goto exit;
 709                         }
 710                         dbg("check for " KEY_DRIVER " rule->driver='%s' sysfs_device->driver_name='%s'",
 711                             rule->driver, parent_device->driver_name);
 712                         if (strcmp_pattern(rule->driver, parent_device->driver_name) != 0) {
 713                                 dbg(KEY_DRIVER " is not matching");
 714                                 if (rule->driver_operation != KEY_OP_NOMATCH)
 715                                         goto try_parent;
 716                         } else {
 717                                 dbg(KEY_DRIVER " matches");
 718                                 if (rule->driver_operation == KEY_OP_NOMATCH)
 719                                         goto try_parent;
 720                         }
 721                         dbg(KEY_DRIVER " key is true");
 722                 }
 723
 724                 /* check for matching bus value */
 725                 if (rule->bus_operation != KEY_OP_UNSET) {
 726                         if (parent_device == NULL) {
 727                                 dbg("device has no sysfs_device");
 728                                 goto exit;
 729                         }
 730                         dbg("check for " KEY_BUS " rule->bus='%s' sysfs_device->bus='%s'",
 731                             rule->bus, parent_device->bus);
 732                         if (strcmp_pattern(rule->bus, parent_device->bus) != 0) {
 733                                 dbg(KEY_BUS " is not matching");
 734                                 if (rule->bus_operation != KEY_OP_NOMATCH)
 735                                         goto try_parent;
 736                         } else {
 737                                 dbg(KEY_BUS " matches");
 738                                 if (rule->bus_operation == KEY_OP_NOMATCH)
 739                                         goto try_parent;
 740                         }
 741                         dbg(KEY_BUS " key is true");
 742                 }
 743
 744                 /* check for matching bus id */
 745                 if (rule->id_operation != KEY_OP_UNSET) {
 746                         if (parent_device == NULL) {
 747                                 dbg("device has no sysfs_device");
 748                                 goto exit;
 749                         }
 750                         dbg("check " KEY_ID);
 751                         if (strcmp_pattern(rule->id, parent_device->bus_id) != 0) {
 752                                 dbg(KEY_ID " is not matching");
 753                                 if (rule->id_operation != KEY_OP_NOMATCH)
 754                                         goto try_parent;
 755                         } else {
 756                                 dbg(KEY_ID " matches");
 757                                 if (rule->id_operation == KEY_OP_NOMATCH)
 758                                         goto try_parent;
 759                         }
 760                         dbg(KEY_ID " key is true");
 761                 }
 762
 763                 /* check for matching sysfs pairs */
 764                 if (rule->sysfs_pair_count) {
 765                         int i;
 766
 767                         dbg("check " KEY_SYSFS " pairs");
 768                         for (i = 0; i < rule->sysfs_pair_count; i++) {
 769                                 struct key_pair *pair;
 770                                 char value[VALUE_SIZE];
 771                                 size_t len;
 772
 773                                 pair = &rule->sysfs_pair[i];
 774                                 if (find_sysfs_attribute(class_dev, parent_device, pair->name, value, sizeof(value)) != 0)
 775                                         goto try_parent;
 776
 777                                 /* strip trailing whitespace of value, if not asked to match for it */
 778                                 len = strlen(pair->value);
 779                                 if (len && !isspace(pair->value[len-1])) {
 780                                         len = strlen(value);
 781                                         while (len > 0 && isspace(value[len-1]))
 782                                                 value[--len] = '\0';
 783                                         dbg("removed %i trailing whitespace chars from '%s'", strlen(value)-len, value);
 784                                 }
 785
 786                                 dbg("compare attribute '%s' value '%s' with '%s'", pair->name, value, pair->value);
 787                                 if (strcmp_pattern(pair->value, value) != 0) {
 788                                         dbg(KEY_SYSFS "{'%s'} is not matching", pair->name);
 789                                         if (pair->operation != KEY_OP_NOMATCH)
 790                                                 goto try_parent;
 791                                 } else {
 792                                         dbg(KEY_SYSFS "{'%s'} matches", pair->name);
 793                                         if (pair->operation == KEY_OP_NOMATCH)
 794                                                 goto try_parent;
 795                                 }
 796                         }
 797                         dbg(KEY_SYSFS " keys are true");
 798                 }
 799
 800                 /* found matching physical device  */
 801                 break;
 802 try_parent:
 803                 dbg("try parent sysfs device");
 804                 parent_device = sysfs_get_device_parent(parent_device);
 805                 if (parent_device == NULL)
 806                         goto exit;
 807                 dbg("look at sysfs_device->path='%s'", parent_device->path);
 808                 dbg("look at sysfs_device->bus_id='%s'", parent_device->bus_id);
 809         }
 810
 811         /* import variables from file into environment */
 812         if (rule->import_operation != KEY_OP_UNSET) {
 813                 char import[PATH_SIZE];
 814
 815                 strlcpy(import, rule->import, sizeof(import));
 816                 apply_format(udev, import, sizeof(import), class_dev, sysfs_device);
 817                 dbg("check for " KEY_IMPORT " import='%s", import);
 818                 if (import_file_into_env(import) != 0) {
 819                         dbg(KEY_IMPORT " failed");
 820                         if (rule->import_operation != KEY_OP_NOMATCH)
 821                                 goto exit;
 822                 } else
 823                         dbg(KEY_IMPORT " file '%s' imported", rule->import);
 824                 dbg(KEY_IMPORT " key is true");
 825         }
 826
 827         /* execute external program */
 828         if (rule->program_operation != KEY_OP_UNSET) {
 829                 char program[PATH_SIZE];
 830                 char result[PATH_SIZE];
 831
 832                 strlcpy(program, rule->program, sizeof(program));
 833                 apply_format(udev, program, sizeof(program), class_dev, sysfs_device);
 834                 dbg("check for " KEY_PROGRAM " program='%s", program);
 835                 if (execute_program(program, udev->subsystem, result, sizeof(result), NULL) != 0) {
 836                         dbg(KEY_PROGRAM " is not matching");
 837                         if (rule->program_operation != KEY_OP_NOMATCH)
 838                                 goto exit;
 839                 } else {
 840                         dbg(KEY_PROGRAM " matches");
 841                         remove_trailing_char(result, '\n');
 842                         replace_untrusted_chars(result);
 843                         dbg("result is '%s'", result);
 844                         strlcpy(udev->program_result, result, sizeof(udev->program_result));
 845                         dbg(KEY_PROGRAM " returned successful");
 846                         if (rule->program_operation == KEY_OP_NOMATCH)
 847                                 goto exit;
 848                 }
 849                 dbg(KEY_PROGRAM " key is true");
 850         }
 851
 852         /* check for matching result of external program */
 853         if (rule->result_operation != KEY_OP_UNSET) {
 854                 dbg("check for " KEY_RESULT " rule->result='%s', udev->program_result='%s'",
 855                    rule->result, udev->program_result);
 856                 if (strcmp_pattern(rule->result, udev->program_result) != 0) {
 857                         dbg(KEY_RESULT " is not matching");
 858                         if (rule->result_operation != KEY_OP_NOMATCH)
 859                                 goto exit;
 860                 } else {
 861                         dbg(KEY_RESULT " matches");
 862                         if (rule->result_operation == KEY_OP_NOMATCH)
 863                                 goto exit;
 864                 }
 865                 dbg(KEY_RESULT " key is true");
 866         }
 867
 868         /* rule matches */
 869         return 0;
 870
 871 exit:
 872         return -1;
 873 }
 874
 875 int udev_rules_get_name(struct udevice *udev, struct sysfs_class_device *class_dev)
 876 {
 877         struct sysfs_class_device *class_dev_parent;
 878         struct sysfs_device *sysfs_device = NULL;
 879         struct udev_rule *rule;
 880
 881         dbg("class_dev->name='%s'", class_dev->name);
 882
 883         /* Figure out where the "device"-symlink is at.  For char devices this will
 884          * always be in the class_dev->path.  On block devices, only the main block
 885          * device will have the device symlink in it's path. All partition devices
 886          * need to look at the symlink in its parent directory.
 887          */
 888         class_dev_parent = sysfs_get_classdev_parent(class_dev);
 889         if (class_dev_parent != NULL) {
 890                 dbg("given class device has a parent, use this instead");
 891                 sysfs_device = sysfs_get_classdev_device(class_dev_parent);
 892         } else {
 893                 sysfs_device = sysfs_get_classdev_device(class_dev);
 894         }
 895
 896         if (sysfs_device) {
 897                 dbg("found devices device: path='%s', bus_id='%s', bus='%s'",
 898                     sysfs_device->path, sysfs_device->bus_id, sysfs_device->bus);
 899                 strlcpy(udev->bus_id, sysfs_device->bus_id, sizeof(udev->bus_id));
 900         }
 901
 902         dbg("udev->kernel_name='%s'", udev->kernel_name);
 903
 904         /* look for a matching rule to apply */
 905         udev_rules_iter_init();
 906         while (1) {
 907                 rule = udev_rules_iter_next();
 908                 if (rule == NULL)
 909                         break;
 910
 911                 if (udev->name_set && rule->name_operation != KEY_OP_UNSET) {
 912                         dbg("node name already set, rule ignored");
 913                         continue;
 914                 }
 915
 916                 dbg("process rule");
 917                 if (match_rule(udev, rule, class_dev, sysfs_device) == 0) {
 918                         /* apply options */
 919                         if (rule->ignore_device) {
 920                                 info("configured rule in '%s[%i]' applied, '%s' is ignored",
 921                                      rule->config_file, rule->config_line, udev->kernel_name);
 922                                 udev->ignore_device = 1;
 923                                 return 0;
 924                         }
 925                         if (rule->ignore_remove) {
 926                                 udev->ignore_remove = 1;
 927                                 dbg("remove event should be ignored");
 928                         }
 929                         /* apply all_partitions option only at a main block device */
 930                         if (rule->partitions && udev->type == DEV_BLOCK && udev->kernel_number[0] == '\0') {
 931                                 udev->partitions = rule->partitions;
 932                                 dbg("creation of partition nodes requested");
 933                         }
 934
 935                         /* apply permissions */
 936                         if (!udev->mode_final && rule->mode != 0000) {
 937                                 if (rule->mode_operation == KEY_OP_ASSIGN_FINAL)
 938                                         udev->mode_final = 1;
 939                                 udev->mode = rule->mode;
 940                                 dbg("applied mode=%#o to '%s'", udev->mode, udev->kernel_name);
 941                         }
 942                         if (!udev->owner_final && rule->owner[0] != '\0') {
 943                                 if (rule->owner_operation == KEY_OP_ASSIGN_FINAL)
 944                                         udev->owner_final = 1;
 945                                 strlcpy(udev->owner, rule->owner, sizeof(udev->owner));
 946                                 apply_format(udev, udev->owner, sizeof(udev->owner), class_dev, sysfs_device);
 947                                 dbg("applied owner='%s' to '%s'", udev->owner, udev->kernel_name);
 948                         }
 949                         if (!udev->group_final && rule->group[0] != '\0') {
 950                                 if (rule->group_operation == KEY_OP_ASSIGN_FINAL)
 951                                         udev->group_final = 1;
 952                                 strlcpy(udev->group, rule->group, sizeof(udev->group));
 953                                 apply_format(udev, udev->group, sizeof(udev->group), class_dev, sysfs_device);
 954                                 dbg("applied group='%s' to '%s'", udev->group, udev->kernel_name);
 955                         }
 956
 957                         /* collect symlinks */
 958                         if (!udev->symlink_final && rule->symlink_operation != KEY_OP_UNSET) {
 959                                 char temp[PATH_SIZE];
 960                                 char *pos, *next;
 961
 962                                 if (rule->symlink_operation == KEY_OP_ASSIGN_FINAL)
 963                                         udev->symlink_final = 1;
 964                                 if (rule->symlink_operation == KEY_OP_ASSIGN || rule->symlink_operation == KEY_OP_ASSIGN_FINAL) {
 965                                         struct name_entry *name_loop;
 966                                         struct name_entry *temp_loop;
 967
 968                                         info("reset symlink list");
 969                                         list_for_each_entry_safe(name_loop, temp_loop, &udev->symlink_list, node) {
 970                                                 list_del(&name_loop->node);
 971                                                 free(name_loop);
 972                                         }
 973                                 }
 974                                 if (rule->symlink[0] != '\0') {
 975                                         info("configured rule in '%s[%i]' applied, added symlink '%s'",
 976                                              rule->config_file, rule->config_line, rule->symlink);
 977                                         strlcpy(temp, rule->symlink, sizeof(temp));
 978                                         apply_format(udev, temp, sizeof(temp), class_dev, sysfs_device);
 979
 980                                         /* add multiple symlinks separated by spaces */
 981                                         pos = temp;
 982                                         next = strchr(temp, ' ');
 983                                         while (next) {
 984                                                 next[0] = '\0';
 985                                                 info("add symlink '%s'", pos);
 986                                                 name_list_add(&udev->symlink_list, pos, 0);
 987                                                 pos = &next[1];
 988                                                 next = strchr(pos, ' ');
 989                                         }
 990                                         info("add symlink '%s'", pos);
 991                                         name_list_add(&udev->symlink_list, pos, 0);
 992                                 }
 993                         }
 994
 995                         /* set name, later rules with name set will be ignored */
 996                         if (rule->name_operation != KEY_OP_UNSET) {
 997                                 udev->name_set = 1;
 998                                 if (rule->name[0] == '\0') {
 999                                         info("configured rule in '%s[%i]' applied, node handling for '%s' supressed",
1000                                              rule->config_file, rule->config_line, udev->kernel_name);
1001                                 } else {
1002                                         strlcpy(udev->name, rule->name, sizeof(udev->name));
1003                                         apply_format(udev, udev->name, sizeof(udev->name), class_dev, sysfs_device);
1004                                         strlcpy(udev->config_file, rule->config_file, sizeof(udev->config_file));
1005                                         udev->config_line = rule->config_line;
1006
1007                                         info("configured rule in '%s:%i' applied, '%s' becomes '%s'",
1008                                              rule->config_file, rule->config_line, udev->kernel_name, rule->name);
1009                                         if (udev->type != DEV_NET)
1010                                                 dbg("name, '%s' is going to have owner='%s', group='%s', mode=%#o partitions=%i",
1011                                                     udev->name, udev->owner, udev->group, udev->mode, udev->partitions);
1012                                 }
1013                         }
1014
1015                         if (!udev->run_final && rule->run_operation != KEY_OP_UNSET) {
1016                                 char program[PATH_SIZE];
1017
1018                                 if (rule->run_operation == KEY_OP_ASSIGN_FINAL)
1019                                         udev->run_final = 1;
1020                                 if (rule->run_operation == KEY_OP_ASSIGN || rule->run_operation == KEY_OP_ASSIGN_FINAL) {
1021                                         struct name_entry *name_loop;
1022                                         struct name_entry *temp_loop;
1023
1024                                         info("reset run list");
1025                                         list_for_each_entry_safe(name_loop, temp_loop, &udev->run_list, node) {
1026                                                 list_del(&name_loop->node);
1027                                                 free(name_loop);
1028                                         }
1029                                 }
1030                                 if (rule->run[0] != '\0') {
1031                                         strlcpy(program, rule->run, sizeof(program));
1032                                         apply_format(udev, program, sizeof(program), class_dev, sysfs_device);
1033                                         dbg("add run '%s'", program);
1034                                         name_list_add(&udev->run_list, program, 0);
1035                                 }
1036                         }
1037
1038                         if (rule->last_rule) {
1039                                 dbg("last rule to be applied");
1040                                 break;
1041                         }
1042                 }
1043         }
1044
1045         if (udev->name[0] == '\0') {
1046                 strlcpy(udev->name, udev->kernel_name, sizeof(udev->name));
1047                 info("no rule found, use kernel name '%s'", udev->name);
1048         }
1049
1050         if (udev->tmp_node[0] != '\0') {
1051                 dbg("removing temporary device node");
1052                 unlink_secure(udev->tmp_node);
1053                 udev->tmp_node[0] = '\0';
1054         }
1055
1056         return 0;
1057 }
1058
1059 int udev_rules_get_run(struct udevice *udev, struct sysfs_device *sysfs_device)
1060 {
1061         struct udev_rule *rule;
1062
1063         /* look for a matching rule to apply */
1064         udev_rules_iter_init();
1065         while (1) {
1066                 rule = udev_rules_iter_next();
1067                 if (rule == NULL)
1068                         break;
1069
1070                 dbg("process rule");
1071                 if (rule->run_operation == KEY_OP_UNSET)
1072                         continue;
1073
1074                 if (rule->name_operation != KEY_OP_UNSET || rule->symlink_operation != KEY_OP_UNSET ||
1075                     rule->mode != 0000 || rule->owner[0] != '\0' || rule->group[0] != '\0') {
1076                         dbg("skip rule that names a device");
1077                         continue;
1078                 }
1079
1080                 if (match_rule(udev, rule, NULL, sysfs_device) == 0) {
1081                         if (rule->ignore_device) {
1082                                 info("configured rule in '%s[%i]' applied, '%s' is ignored",
1083                                      rule->config_file, rule->config_line, udev->kernel_name);
1084                                 udev->ignore_device = 1;
1085                                 return 0;
1086                         }
1087
1088                         if (!udev->run_final && rule->run_operation != KEY_OP_UNSET) {
1089                                 char program[PATH_SIZE];
1090
1091                                 if (rule->run_operation == KEY_OP_ASSIGN || rule->run_operation == KEY_OP_ASSIGN_FINAL) {
1092                                         struct name_entry *name_loop;
1093                                         struct name_entry *temp_loop;
1094
1095                                         info("reset run list");
1096                                         list_for_each_entry_safe(name_loop, temp_loop, &udev->run_list, node) {
1097                                                 list_del(&name_loop->node);
1098                                                 free(name_loop);
1099                                         }
1100                                 }
1101                                 if (rule->run[0] != '\0') {
1102                                         strlcpy(program, rule->run, sizeof(program));
1103                                         apply_format(udev, program, sizeof(program), NULL, sysfs_device);
1104                                         dbg("add run '%s'", program);
1105                                         name_list_add(&udev->run_list, program, 0);
1106                                 }
1107                                 if (rule->run_operation == KEY_OP_ASSIGN_FINAL)
1108                                         break;
1109                         }
1110
1111                         if (rule->last_rule) {
1112                                 dbg("last rule to be applied");
1113                                 break;
1114                         }
1115                 }
1116         }
1117
1118         return 0;
1119 }