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