udev_rules.c

   1 /*
   2  * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
   3  * Copyright (C) 2003-2006 Kay Sievers <kay.sievers@vrfy.org>
   4  *
   5  *      This program is free software; you can redistribute it and/or modify it
   6  *      under the terms of the GNU General Public License as published by the
   7  *      Free Software Foundation version 2 of the License.
   8  *
   9  *      This program is distributed in the hope that it will be useful, but
  10  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *      General Public License for more details.
  13  *
  14  *      You should have received a copy of the GNU General Public License along
  15  *      with this program; if not, write to the Free Software Foundation, Inc.,
  16  *      51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  17  *
  18  */
  19
  20 #include <stddef.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <stdio.h>
  24 #include <fcntl.h>
  25 #include <ctype.h>
  26 #include <unistd.h>
  27 #include <errno.h>
  28 #include <syslog.h>
  29 #include <fnmatch.h>
  30 #include <sys/wait.h>
  31 #include <sys/stat.h>
  32
  33 #include "udev.h"
  34 #include "udev_rules.h"
  35
  36
  37 /* extract possible {attr} and move str behind it */
  38 static char *get_format_attribute(char **str)
  39 {
  40         char *pos;
  41         char *attr = NULL;
  42
  43         if (*str[0] == '{') {
  44                 pos = strchr(*str, '}');
  45                 if (pos == NULL) {
  46                         err("missing closing brace for format");
  47                         return NULL;
  48                 }
  49                 pos[0] = '\0';
  50                 attr = *str+1;
  51                 *str = pos+1;
  52                 dbg("attribute='%s', str='%s'", attr, *str);
  53         }
  54         return attr;
  55 }
  56
  57 /* extract possible format length and move str behind it*/
  58 static int get_format_len(char **str)
  59 {
  60         int num;
  61         char *tail;
  62
  63         if (isdigit(*str[0])) {
  64                 num = (int) strtoul(*str, &tail, 10);
  65                 if (num > 0) {
  66                         *str = tail;
  67                         dbg("format length=%i", num);
  68                         return num;
  69                 } else {
  70                         err("format parsing error '%s'", *str);
  71                 }
  72         }
  73         return -1;
  74 }
  75
  76 static int get_key(char **line, char **key, char **value)
  77 {
  78         char *linepos;
  79         char *temp;
  80
  81         linepos = *line;
  82         if (!linepos)
  83                 return -1;
  84
  85         if (strchr(linepos, '\\')) {
  86                 dbg("escaped characters are not supported, skip");
  87                 return -1;
  88         }
  89
  90         /* skip whitespace */
  91         while (isspace(linepos[0]))
  92                 linepos++;
  93
  94         /* get the key */
  95         *key = linepos;
  96         while (1) {
  97                 linepos++;
  98                 if (linepos[0] == '\0')
  99                         return -1;
 100                 if (isspace(linepos[0]))
 101                         break;
 102                 if (linepos[0] == '=')
 103                         break;
 104         }
 105
 106         /* terminate key */
 107         linepos[0] = '\0';
 108         linepos++;
 109
 110         /* skip whitespace */
 111         while (isspace(linepos[0]))
 112                 linepos++;
 113
 114         /* get the value*/
 115         if (linepos[0] == '"') {
 116                 linepos++;
 117                 temp = strchr(linepos, '"');
 118                 if (!temp) {
 119                         dbg("missing closing quote");
 120                         return -1;
 121                 }
 122                 dbg("value is quoted");
 123                 temp[0] = '\0';
 124         } else if (linepos[0] == '\'') {
 125                 linepos++;
 126                 temp = strchr(linepos, '\'');
 127                 if (!temp) {
 128                         dbg("missing closing quote");
 129                         return -1;
 130                 }
 131                 dbg("value is quoted");
 132                 temp[0] = '\0';
 133         } else if (linepos[0] == '\0') {
 134                 dbg("value is empty");
 135         } else {
 136                 temp = linepos;
 137                 while (temp[0] && !isspace(temp[0]))
 138                         temp++;
 139                 temp[0] = '\0';
 140         }
 141         *value = linepos;
 142
 143         return 0;
 144 }
 145
 146 static int import_keys_into_env(struct udevice *udev, const char *buf, size_t bufsize)
 147 {
 148         char line[LINE_SIZE];
 149         const char *bufline;
 150         char *linepos;
 151         char *variable;
 152         char *value;
 153         size_t cur;
 154         size_t count;
 155         int lineno;
 156
 157         /* loop through the whole buffer */
 158         lineno = 0;
 159         cur = 0;
 160         while (cur < bufsize) {
 161                 count = buf_get_line(buf, bufsize, cur);
 162                 bufline = &buf[cur];
 163                 cur += count+1;
 164                 lineno++;
 165
 166                 if (count >= sizeof(line)) {
 167                         err("line too long, conf line skipped %s, line %d", udev_config_filename, lineno);
 168                         continue;
 169                 }
 170
 171                 /* eat the whitespace */
 172                 while ((count > 0) && isspace(bufline[0])) {
 173                         bufline++;
 174                         count--;
 175                 }
 176                 if (count == 0)
 177                         continue;
 178
 179                 /* see if this is a comment */
 180                 if (bufline[0] == COMMENT_CHARACTER)
 181                         continue;
 182
 183                 memcpy(line, bufline, count);
 184                 line[count] = '\0';
 185
 186                 linepos = line;
 187                 if (get_key(&linepos, &variable, &value) == 0) {
 188                         dbg("import '%s=%s'", variable, value);
 189                         name_list_key_add(&udev->env_list, variable, value);
 190                         setenv(variable, value, 1);
 191                 }
 192         }
 193
 194         return 0;
 195 }
 196
 197 static int import_file_into_env(struct udevice *udev, const char *filename)
 198 {
 199         char *buf;
 200         size_t bufsize;
 201
 202         if (file_map(filename, &buf, &bufsize) != 0) {
 203                 err("can't open '%s': %s", filename, strerror(errno));
 204                 return -1;
 205         }
 206         import_keys_into_env(udev, buf, bufsize);
 207         file_unmap(buf, bufsize);
 208
 209         return 0;
 210 }
 211
 212 static int import_program_into_env(struct udevice *udev, const char *program)
 213 {
 214         char result[1024];
 215         size_t reslen;
 216
 217         if (run_program(program, udev->dev->subsystem, result, sizeof(result), &reslen, (udev_log_priority >= LOG_INFO)) != 0)
 218                 return -1;
 219         return import_keys_into_env(udev, result, reslen);
 220 }
 221
 222 static int import_parent_into_env(struct udevice *udev, const char *filter)
 223 {
 224         struct sysfs_device *dev_parent;
 225         int rc = -1;
 226
 227         dev_parent = sysfs_device_get_parent(udev->dev);
 228         if (dev_parent != NULL) {
 229                 struct udevice *udev_parent;
 230                 struct name_entry *name_loop;
 231
 232                 dbg("found parent '%s', get the node name", dev_parent->devpath);
 233                 udev_parent = udev_device_init();
 234                 if (udev_parent == NULL)
 235                         return -1;
 236                 /* import the udev_db of the parent */
 237                 if (udev_db_get_device(udev_parent, dev_parent->devpath) == 0) {
 238                         dbg("import stored parent env '%s'", udev_parent->name);
 239                         list_for_each_entry(name_loop, &udev_parent->env_list, node) {
 240                                 char name[NAME_SIZE];
 241                                 char *pos;
 242
 243                                 strlcpy(name, name_loop->name, sizeof(name));
 244                                 pos = strchr(name, '=');
 245                                 if (pos) {
 246                                         pos[0] = '\0';
 247                                         pos++;
 248                                         if (fnmatch(filter, name, 0) == 0) {
 249                                                 dbg("import key '%s'", name_loop->name);
 250                                                 name_list_add(&udev->env_list, name_loop->name, 0);
 251                                                 setenv(name, pos, 1);
 252                                         } else
 253                                                 dbg("skip key '%s'", name_loop->name);
 254                                 }
 255                         }
 256                         rc = 0;
 257                 } else
 258                         dbg("parent not found in database");
 259                 udev_device_cleanup(udev_parent);
 260         }
 261
 262         return rc;
 263 }
 264
 265 #define WAIT_LOOP_PER_SECOND            50
 266 static int wait_for_sysfs(struct udevice *udev, const char *file, int timeout)
 267 {
 268         char devicepath[PATH_SIZE];
 269         char filepath[PATH_SIZE];
 270         struct stat stats;
 271         int loop = timeout * WAIT_LOOP_PER_SECOND;
 272
 273         strlcpy(devicepath, sysfs_path, sizeof(devicepath));
 274         strlcat(devicepath, udev->dev->devpath, sizeof(devicepath));
 275         strlcpy(filepath, devicepath, sizeof(filepath));
 276         strlcat(filepath, "/", sizeof(filepath));
 277         strlcat(filepath, file, sizeof(filepath));
 278
 279         dbg("will wait %i sec for '%s'", timeout, filepath);
 280         while (--loop) {
 281                 /* lookup file */
 282                 if (stat(filepath, &stats) == 0) {
 283                         info("file '%s' appeared after %i loops", filepath, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
 284                         return 0;
 285                 }
 286                 /* make sure the device does not have disappeared in the meantime */
 287                 if (stat(devicepath, &stats) != 0) {
 288                         info("device disappeared while waiting for '%s'", filepath);
 289                         return -2;
 290                 }
 291                 info("wait for '%s' for %i mseconds", filepath, 1000 / WAIT_LOOP_PER_SECOND);
 292                 usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
 293         }
 294         err("waiting for '%s' failed", filepath);
 295         return -1;
 296 }
 297
 298 void udev_rules_apply_format(struct udevice *udev, char *string, size_t maxsize)
 299 {
 300         char temp[PATH_SIZE];
 301         char temp2[PATH_SIZE];
 302         char *head, *tail, *pos, *cpos, *attr, *rest;
 303         int len;
 304         int i;
 305         int count;
 306         enum subst_type {
 307                 SUBST_UNKNOWN,
 308                 SUBST_DEVPATH,
 309                 SUBST_KERNEL,
 310                 SUBST_KERNEL_NUMBER,
 311                 SUBST_ID,
 312                 SUBST_MAJOR,
 313                 SUBST_MINOR,
 314                 SUBST_RESULT,
 315                 SUBST_ATTR,
 316                 SUBST_PARENT,
 317                 SUBST_TEMP_NODE,
 318                 SUBST_ROOT,
 319                 SUBST_ENV,
 320         };
 321         static const struct subst_map {
 322                 char *name;
 323                 char fmt;
 324                 enum subst_type type;
 325         } map[] = {
 326                 { .name = "devpath",    .fmt = 'p',     .type = SUBST_DEVPATH },
 327                 { .name = "number",     .fmt = 'n',     .type = SUBST_KERNEL_NUMBER },
 328                 { .name = "kernel",     .fmt = 'k',     .type = SUBST_KERNEL },
 329                 { .name = "id",         .fmt = 'b',     .type = SUBST_ID },
 330                 { .name = "major",      .fmt = 'M',     .type = SUBST_MAJOR },
 331                 { .name = "minor",      .fmt = 'm',     .type = SUBST_MINOR },
 332                 { .name = "result",     .fmt = 'c',     .type = SUBST_RESULT },
 333                 { .name = "attr",       .fmt = 's',     .type = SUBST_ATTR },
 334                 { .name = "sysfs",      .fmt = 's',     .type = SUBST_ATTR },
 335                 { .name = "parent",     .fmt = 'P',     .type = SUBST_PARENT },
 336                 { .name = "tempnode",   .fmt = 'N',     .type = SUBST_TEMP_NODE },
 337                 { .name = "root",       .fmt = 'r',     .type = SUBST_ROOT },
 338                 { .name = "env",        .fmt = 'E',     .type = SUBST_ENV },
 339                 { NULL, '\0', 0 }
 340         };
 341         enum subst_type type;
 342         const struct subst_map *subst;
 343
 344         head = string;
 345         while (1) {
 346                 len = -1;
 347                 while (head[0] != '\0') {
 348                         if (head[0] == '$') {
 349                                 /* substitute named variable */
 350                                 if (head[1] == '\0')
 351                                         break;
 352                                 if (head[1] == '$') {
 353                                         strlcpy(temp, head+2, sizeof(temp));
 354                                         strlcpy(head+1, temp, maxsize);
 355                                         head++;
 356                                         continue;
 357                                 }
 358                                 head[0] = '\0';
 359                                 for (subst = map; subst->name; subst++) {
 360                                         if (strncasecmp(&head[1], subst->name, strlen(subst->name)) == 0) {
 361                                                 type = subst->type;
 362                                                 tail = head + strlen(subst->name)+1;
 363                                                 dbg("will substitute format name '%s'", subst->name);
 364                                                 goto found;
 365                                         }
 366                                 }
 367                                 head[0] = '$';
 368                                 err("unknown format variable '%s'", head);
 369                         } else if (head[0] == '%') {
 370                                 /* substitute format char */
 371                                 if (head[1] == '\0')
 372                                         break;
 373                                 if (head[1] == '%') {
 374                                         strlcpy(temp, head+2, sizeof(temp));
 375                                         strlcpy(head+1, temp, maxsize);
 376                                         head++;
 377                                         continue;
 378                                 }
 379                                 head[0] = '\0';
 380                                 tail = head+1;
 381                                 len = get_format_len(&tail);
 382                                 for (subst = map; subst->name; subst++) {
 383                                         if (tail[0] == subst->fmt) {
 384                                                 type = subst->type;
 385                                                 tail++;
 386                                                 dbg("will substitute format char '%c'", subst->fmt);
 387                                                 goto found;
 388                                         }
 389                                 }
 390                                 head[0] = '%';
 391                                 err("unknown format char '%c'", tail[0]);
 392                         }
 393                         head++;
 394                 }
 395                 break;
 396 found:
 397                 attr = get_format_attribute(&tail);
 398                 strlcpy(temp, tail, sizeof(temp));
 399                 dbg("format=%i, string='%s', tail='%s'", type ,string, tail);
 400
 401                 switch (type) {
 402                 case SUBST_DEVPATH:
 403                         strlcat(string, udev->dev->devpath, maxsize);
 404                         dbg("substitute devpath '%s'", udev->dev->devpath);
 405                         break;
 406                 case SUBST_KERNEL:
 407                         strlcat(string, udev->dev->kernel, maxsize);
 408                         dbg("substitute kernel name '%s'", udev->dev->kernel);
 409                         break;
 410                 case SUBST_KERNEL_NUMBER:
 411                         strlcat(string, udev->dev->kernel_number, maxsize);
 412                         dbg("substitute kernel number '%s'", udev->dev->kernel_number);
 413                         break;
 414                 case SUBST_ID:
 415                         if (udev->dev_parent != NULL) {
 416                                 strlcat(string, udev->dev_parent->kernel, maxsize);
 417                                 dbg("substitute id '%s'", udev->dev_parent->kernel);
 418                         }
 419                         break;
 420                 case SUBST_MAJOR:
 421                         sprintf(temp2, "%d", major(udev->devt));
 422                         strlcat(string, temp2, maxsize);
 423                         dbg("substitute major number '%s'", temp2);
 424                         break;
 425                 case SUBST_MINOR:
 426                         sprintf(temp2, "%d", minor(udev->devt));
 427                         strlcat(string, temp2, maxsize);
 428                         dbg("substitute minor number '%s'", temp2);
 429                         break;
 430                 case SUBST_RESULT:
 431                         if (udev->program_result[0] == '\0')
 432                                 break;
 433                         /* get part part of the result string */
 434                         i = 0;
 435                         if (attr != NULL)
 436                                 i = strtoul(attr, &rest, 10);
 437                         if (i > 0) {
 438                                 dbg("request part #%d of result string", i);
 439                                 cpos = udev->program_result;
 440                                 while (--i) {
 441                                         while (cpos[0] != '\0' && !isspace(cpos[0]))
 442                                                 cpos++;
 443                                         while (isspace(cpos[0]))
 444                                                 cpos++;
 445                                 }
 446                                 if (i > 0) {
 447                                         err("requested part of result string not found");
 448                                         break;
 449                                 }
 450                                 strlcpy(temp2, cpos, sizeof(temp2));
 451                                 /* %{2+}c copies the whole string from the second part on */
 452                                 if (rest[0] != '+') {
 453                                         cpos = strchr(temp2, ' ');
 454                                         if (cpos)
 455                                                 cpos[0] = '\0';
 456                                 }
 457                                 strlcat(string, temp2, maxsize);
 458                                 dbg("substitute part of result string '%s'", temp2);
 459                         } else {
 460                                 strlcat(string, udev->program_result, maxsize);
 461                                 dbg("substitute result string '%s'", udev->program_result);
 462                         }
 463                         break;
 464                 case SUBST_ATTR:
 465                         if (attr == NULL)
 466                                 err("missing file parameter for attr");
 467                         else {
 468                                 const char *value = NULL;
 469                                 size_t size;
 470
 471                                 /* first try the current device, other matches may have selected */
 472                                 if (udev->dev_parent != NULL && udev->dev_parent != udev->dev)
 473                                         value = sysfs_attr_get_value(udev->dev_parent->devpath, attr);
 474
 475                                 /* look at all devices along the chain of parents */
 476                                 if (value == NULL) {
 477                                         struct sysfs_device *dev_parent = udev->dev;
 478
 479                                         do {
 480                                                 dbg("looking at '%s'", dev_parent->devpath);
 481                                                 value = sysfs_attr_get_value(dev_parent->devpath, attr);
 482                                                 if (value != NULL) {
 483                                                         strlcpy(temp2, value, sizeof(temp2));
 484                                                         break;
 485                                                 }
 486                                                 dev_parent = sysfs_device_get_parent(dev_parent);
 487                                         } while (dev_parent != NULL);
 488                                 }
 489
 490                                 if (value == NULL)
 491                                         break;
 492
 493                                 /* strip trailing whitespace and replace untrusted characters of sysfs value */
 494                                 size = strlcpy(temp2, value, sizeof(temp2));
 495                                 if (size >= sizeof(temp2))
 496                                         size = sizeof(temp2)-1;
 497                                 while (size > 0 && isspace(temp2[size-1]))
 498                                         temp2[--size] = '\0';
 499                                 count = replace_untrusted_chars(temp2);
 500                                 if (count > 0)
 501                                         info("%i untrusted character(s) replaced" , count);
 502                                 strlcat(string, temp2, maxsize);
 503                                 dbg("substitute sysfs value '%s'", temp2);
 504                         }
 505                         break;
 506                 case SUBST_PARENT:
 507                         {
 508                                 struct sysfs_device *dev_parent;
 509
 510                                 dev_parent = sysfs_device_get_parent(udev->dev);
 511                                 if (dev_parent != NULL) {
 512                                         struct udevice *udev_parent;
 513
 514                                         dbg("found parent '%s', get the node name", dev_parent->devpath);
 515                                         udev_parent = udev_device_init();
 516                                         if (udev_parent != NULL) {
 517                                                 /* lookup the name in the udev_db with the DEVPATH of the parent */
 518                                                 if (udev_db_get_device(udev_parent, dev_parent->devpath) == 0) {
 519                                                         strlcat(string, udev_parent->name, maxsize);
 520                                                         dbg("substitute parent node name'%s'", udev_parent->name);
 521                                                 } else
 522                                                         dbg("parent not found in database");
 523                                                 udev_device_cleanup(udev_parent);
 524                                         }
 525                                 }
 526                         }
 527                         break;
 528                 case SUBST_TEMP_NODE:
 529                         if (udev->tmp_node[0] == '\0') {
 530                                 dbg("create temporary device node for callout");
 531                                 snprintf(udev->tmp_node, sizeof(udev->tmp_node), "%s/.tmp-%u-%u",
 532                                          udev_root, major(udev->devt), minor(udev->devt));
 533                                 udev->tmp_node[sizeof(udev->tmp_node)-1] = '\0';
 534                                 udev_node_mknod(udev, udev->tmp_node, udev->devt, 0600, 0, 0);
 535                         }
 536                         strlcat(string, udev->tmp_node, maxsize);
 537                         dbg("substitute temporary device node name '%s'", udev->tmp_node);
 538                         break;
 539                 case SUBST_ROOT:
 540                         strlcat(string, udev_root, maxsize);
 541                         dbg("substitute udev_root '%s'", udev_root);
 542                         break;
 543                 case SUBST_ENV:
 544                         if (attr == NULL) {
 545                                 dbg("missing attribute");
 546                                 break;
 547                         }
 548                         pos = getenv(attr);
 549                         if (pos == NULL) {
 550                                 dbg("env '%s' not available", attr);
 551                                 break;
 552                         }
 553                         dbg("substitute env '%s=%s'", attr, pos);
 554                         strlcat(string, pos, maxsize);
 555                         break;
 556                 default:
 557                         err("unknown substitution type=%i", type);
 558                         break;
 559                 }
 560                 /* possibly truncate to format-char specified length */
 561                 if (len >= 0 && len < (int)strlen(head)) {
 562                         head[len] = '\0';
 563                         dbg("truncate to %i chars, subtitution string becomes '%s'", len, head);
 564                 }
 565                 strlcat(string, temp, maxsize);
 566         }
 567 }
 568
 569 static char *key_val(struct udev_rule *rule, struct key *key)
 570 {
 571         return rule->buf + key->val_off;
 572 }
 573
 574 static char *key_pair_name(struct udev_rule *rule, struct key_pair *pair)
 575 {
 576         return rule->buf + pair->key_name_off;
 577 }
 578
 579 static int match_key(const char *key_name, struct udev_rule *rule, struct key *key, const char *val)
 580 {
 581         int match;
 582         char value[PATH_SIZE];
 583         char *key_value;
 584         char *pos;
 585
 586         if (key->operation != KEY_OP_MATCH &&
 587             key->operation != KEY_OP_NOMATCH)
 588                 return 0;
 589
 590         strlcpy(value, rule->buf + key->val_off, sizeof(value));
 591         key_value = value;
 592
 593         dbg("key %s value='%s'", key_name, key_value);
 594         while (key_value) {
 595                 pos = strchr(key_value, '|');
 596                 if (pos) {
 597                         pos[0] = '\0';
 598                         pos++;
 599                 }
 600                 dbg("match %s '%s' <-> '%s'", key_name, key_value, val);
 601                 match = (fnmatch(key_value, val, 0) == 0);
 602                 if (match && (key->operation != KEY_OP_NOMATCH)) {
 603                         dbg("%s is true (matching value)", key_name);
 604                         return 0;
 605                 }
 606                 if (!match && (key->operation == KEY_OP_NOMATCH)) {
 607                         dbg("%s is true (non-matching value)", key_name);
 608                         return 0;
 609                 }
 610                 key_value = pos;
 611         }
 612         dbg("%s is false", key_name);
 613         return -1;
 614 }
 615
 616 /* match a single rule against a given device and possibly its parent devices */
 617 static int match_rule(struct udevice *udev, struct udev_rule *rule)
 618 {
 619         int i;
 620
 621         if (match_key("ACTION", rule, &rule->action, udev->action))
 622                 goto nomatch;
 623
 624         if (match_key("KERNEL", rule, &rule->kernel, udev->dev->kernel))
 625                 goto nomatch;
 626
 627         if (match_key("SUBSYSTEM", rule, &rule->subsystem, udev->dev->subsystem))
 628                 goto nomatch;
 629
 630         if (match_key("DEVPATH", rule, &rule->devpath, udev->dev->devpath))
 631                 goto nomatch;
 632
 633         if (match_key("DRIVER", rule, &rule->driver, udev->dev->driver))
 634                 goto nomatch;
 635
 636         /* match NAME against a value assigned by an earlier rule */
 637         if (match_key("NAME", rule, &rule->name, udev->name))
 638                 goto nomatch;
 639
 640         for (i = 0; i < rule->env.count; i++) {
 641                 struct key_pair *pair = &rule->env.keys[i];
 642
 643                 /* we only check for matches, assignments will be handled later */
 644                 if (pair->key.operation == KEY_OP_MATCH ||
 645                     pair->key.operation == KEY_OP_NOMATCH) {
 646                         const char *key_name = key_pair_name(rule, pair);
 647                         const char *value = getenv(key_name);
 648
 649                         if (!value) {
 650                                 dbg("ENV{'%s'} is not set, treat as empty", key_name);
 651                                 value = "";
 652                         }
 653                         if (match_key("ENV", rule, &pair->key, value))
 654                                 goto nomatch;
 655                 }
 656         }
 657
 658         if (rule->wait_for_sysfs.operation != KEY_OP_UNSET) {
 659                 int found;
 660
 661                 found = (wait_for_sysfs(udev, key_val(rule, &rule->wait_for_sysfs), 3) == 0);
 662                 if (!found && (rule->wait_for_sysfs.operation != KEY_OP_NOMATCH))
 663                         goto nomatch;
 664         }
 665
 666         /* check for matching sysfs attribute pairs */
 667         for (i = 0; i < rule->attr.count; i++) {
 668                 struct key_pair *pair = &rule->attr.keys[i];
 669
 670                 if (pair->key.operation == KEY_OP_MATCH ||
 671                     pair->key.operation == KEY_OP_NOMATCH) {
 672                         const char *key_name = key_pair_name(rule, pair);
 673                         const char *key_value = key_val(rule, &pair->key);
 674                         const char *value;
 675                         char val[VALUE_SIZE];
 676                         size_t len;
 677
 678                         value = sysfs_attr_get_value(udev->dev->devpath, key_name);
 679                         if (value == NULL)
 680                                 goto nomatch;
 681                         strlcpy(val, value, sizeof(val));
 682
 683                         /* strip trailing whitespace of value, if not asked to match for it */
 684                         len = strlen(key_value);
 685                         if (len > 0 && !isspace(key_value[len-1])) {
 686                                 len = strlen(val);
 687                                 while (len > 0 && isspace(val[len-1]))
 688                                         val[--len] = '\0';
 689                                 dbg("removed %zi trailing whitespace chars from '%s'", strlen(val)-len, val);
 690                         }
 691
 692                         if (match_key("ATTR", rule, &pair->key, val))
 693                                 goto nomatch;
 694                 }
 695         }
 696
 697         /* walk up the chain of parent devices and find a match */
 698         udev->dev_parent = udev->dev;
 699         while (1) {
 700                 /* check for matching kernel device name */
 701                 if (match_key("KERNELS", rule, &rule->kernels, udev->dev_parent->kernel))
 702                         goto try_parent;
 703
 704                 /* check for matching subsystem value */
 705                 if (match_key("SUBSYSTEMS", rule, &rule->subsystems, udev->dev_parent->subsystem))
 706                         goto try_parent;
 707
 708                 /* check for matching driver */
 709                 if (match_key("DRIVERS", rule, &rule->drivers, udev->dev_parent->driver))
 710                         goto try_parent;
 711
 712                 /* check for matching sysfs attribute pairs */
 713                 for (i = 0; i < rule->attrs.count; i++) {
 714                         struct key_pair *pair = &rule->attrs.keys[i];
 715
 716                         if (pair->key.operation == KEY_OP_MATCH ||
 717                             pair->key.operation == KEY_OP_NOMATCH) {
 718                                 const char *key_name = key_pair_name(rule, pair);
 719                                 const char *key_value = key_val(rule, &pair->key);
 720                                 const char *value;
 721                                 char val[VALUE_SIZE];
 722                                 size_t len;
 723
 724                                 value = sysfs_attr_get_value(udev->dev_parent->devpath, key_name);
 725                                 if (value == NULL)
 726                                         value = sysfs_attr_get_value(udev->dev->devpath, key_name);
 727                                 if (value == NULL)
 728                                         goto try_parent;
 729                                 strlcpy(val, value, sizeof(val));
 730
 731                                 /* strip trailing whitespace of value, if not asked to match for it */
 732                                 len = strlen(key_value);
 733                                 if (len > 0 && !isspace(key_value[len-1])) {
 734                                         len = strlen(val);
 735                                         while (len > 0 && isspace(val[len-1]))
 736                                                 val[--len] = '\0';
 737                                         dbg("removed %zi trailing whitespace chars from '%s'", strlen(val)-len, val);
 738                                 }
 739
 740                                 if (match_key("ATTRS", rule, &pair->key, val))
 741                                         goto try_parent;
 742                         }
 743                 }
 744
 745                 /* found matching device  */
 746                 break;
 747 try_parent:
 748                 /* move to parent device */
 749                 dbg("try parent sysfs device");
 750                 udev->dev_parent = sysfs_device_get_parent(udev->dev_parent);
 751                 if (udev->dev_parent == NULL)
 752                         goto nomatch;
 753                 dbg("looking at dev_parent->devpath='%s'", udev->dev_parent->devpath);
 754                 dbg("looking at dev_parent->kernel='%s'", udev->dev_parent->kernel);
 755         }
 756
 757         /* execute external program */
 758         if (rule->program.operation != KEY_OP_UNSET) {
 759                 char program[PATH_SIZE];
 760                 char result[PATH_SIZE];
 761
 762                 strlcpy(program, key_val(rule, &rule->program), sizeof(program));
 763                 udev_rules_apply_format(udev, program, sizeof(program));
 764                 if (run_program(program, udev->dev->subsystem, result, sizeof(result), NULL, (udev_log_priority >= LOG_INFO)) != 0) {
 765                         dbg("PROGRAM is false");
 766                         udev->program_result[0] = '\0';
 767                         if (rule->program.operation != KEY_OP_NOMATCH)
 768                                 goto nomatch;
 769                 } else {
 770                         int count;
 771
 772                         dbg("PROGRAM matches");
 773                         remove_trailing_chars(result, '\n');
 774                         count = replace_untrusted_chars(result);
 775                         if (count)
 776                                 info("%i untrusted character(s) replaced" , count);
 777                         dbg("result is '%s'", result);
 778                         strlcpy(udev->program_result, result, sizeof(udev->program_result));
 779                         dbg("PROGRAM returned successful");
 780                         if (rule->program.operation == KEY_OP_NOMATCH)
 781                                 goto nomatch;
 782                 }
 783                 dbg("PROGRAM key is true");
 784         }
 785
 786         /* check for matching result of external program */
 787         if (match_key("RESULT", rule, &rule->result, udev->program_result))
 788                 goto nomatch;
 789
 790         /* import variables returned from program or or file into environment */
 791         if (rule->import.operation != KEY_OP_UNSET) {
 792                 char import[PATH_SIZE];
 793                 int rc = -1;
 794
 795                 strlcpy(import, key_val(rule, &rule->import), sizeof(import));
 796                 udev_rules_apply_format(udev, import, sizeof(import));
 797                 dbg("check for IMPORT import='%s'", import);
 798                 if (rule->import_type == IMPORT_PROGRAM) {
 799                         rc = import_program_into_env(udev, import);
 800                 } else if (rule->import_type == IMPORT_FILE) {
 801                         dbg("import file import='%s'", import);
 802                         rc = import_file_into_env(udev, import);
 803                 } else if (rule->import_type == IMPORT_PARENT) {
 804                         dbg("import parent import='%s'", import);
 805                         rc = import_parent_into_env(udev, import);
 806                 }
 807                 if (rc != 0) {
 808                         dbg("IMPORT failed");
 809                         if (rule->import.operation != KEY_OP_NOMATCH)
 810                                 goto nomatch;
 811                 } else
 812                         dbg("IMPORT '%s' imported", key_val(rule, &rule->import));
 813                 dbg("IMPORT key is true");
 814         }
 815
 816         /* rule matches, if we have ENV assignments export it */
 817         for (i = 0; i < rule->env.count; i++) {
 818                 struct key_pair *pair = &rule->env.keys[i];
 819
 820                 if (pair->key.operation == KEY_OP_ASSIGN) {
 821                         char temp_value[NAME_SIZE];
 822                         const char *key_name = key_pair_name(rule, pair);
 823                         const char *value = key_val(rule, &pair->key);
 824                         char *key_value;
 825
 826                         /* make sure we don't write to the same string we possibly read from */
 827                         strlcpy(temp_value, value, sizeof(temp_value));
 828                         udev_rules_apply_format(udev, temp_value, NAME_SIZE);
 829
 830                         key_value = name_list_key_add(&udev->env_list, key_name, temp_value);
 831                         if (key_value == NULL)
 832                                 break;
 833
 834                         putenv(key_value);
 835                         dbg("export ENV '%s'", key_value);
 836                 }
 837         }
 838
 839         /* if we have ATTR assignements write value to sysfs file */
 840         for (i = 0; i < rule->attr.count; i++) {
 841                 struct key_pair *pair = &rule->attr.keys[i];
 842
 843                 if (pair->key.operation == KEY_OP_ASSIGN) {
 844                         const char *key_name = key_pair_name(rule, pair);
 845                         const char *key_value = key_val(rule, &pair->key);
 846                         char attr[PATH_SIZE];
 847                         FILE *f;
 848
 849                         strlcpy(attr, sysfs_path, sizeof(attr));
 850                         strlcat(attr, udev->dev->devpath, sizeof(attr));
 851                         strlcat(attr, "/", sizeof(attr));
 852                         strlcat(attr, key_name, sizeof(attr));
 853                         dbg("write '%s' to '%s'", key_value, attr);
 854                         f = fopen(attr, "w");
 855                         if (f != NULL) {
 856                                 if (fprintf(f, "%s\n", key_value) <= 0)
 857                                         err("error writing ATTR{%s}: %s", attr, strerror(errno));
 858                                 fclose(f);
 859                         } else
 860                                 err("error opening ATTR{%s} for writing: %s", attr, strerror(errno));
 861                 }
 862         }
 863         return 0;
 864
 865 nomatch:
 866         return -1;
 867 }
 868
 869 int udev_rules_get_name(struct udev_rules *rules, struct udevice *udev)
 870 {
 871         struct udev_rule *rule;
 872         int name_set = 0;
 873
 874         dbg("udev->dev->devpath='%s'", udev->dev->devpath);
 875         dbg("udev->dev->kernel='%s'", udev->dev->kernel);
 876
 877         /* look for a matching rule to apply */
 878         udev_rules_iter_init(rules);
 879         while (1) {
 880                 rule = udev_rules_iter_next(rules);
 881                 if (rule == NULL)
 882                         break;
 883
 884                 if (name_set &&
 885                     (rule->name.operation == KEY_OP_ASSIGN ||
 886                      rule->name.operation == KEY_OP_ASSIGN_FINAL ||
 887                      rule->name.operation == KEY_OP_ADD)) {
 888                         dbg("node name already set, rule ignored");
 889                         continue;
 890                 }
 891
 892                 dbg("process rule");
 893                 if (match_rule(udev, rule) == 0) {
 894                         /* apply options */
 895                         if (rule->ignore_device) {
 896                                 info("rule applied, '%s' is ignored", udev->dev->kernel);
 897                                 udev->ignore_device = 1;
 898                                 return 0;
 899                         }
 900                         if (rule->ignore_remove) {
 901                                 udev->ignore_remove = 1;
 902                                 dbg("remove event should be ignored");
 903                         }
 904                         /* apply all_partitions option only at a main block device */
 905                         if (rule->partitions &&
 906                             strcmp(udev->dev->subsystem, "block") == 0 && udev->dev->kernel_number[0] == '\0') {
 907                                 udev->partitions = rule->partitions;
 908                                 dbg("creation of partition nodes requested");
 909                         }
 910
 911                         /* apply permissions */
 912                         if (!udev->mode_final && rule->mode != 0000) {
 913                                 if (rule->mode_operation == KEY_OP_ASSIGN_FINAL)
 914                                         udev->mode_final = 1;
 915                                 udev->mode = rule->mode;
 916                                 dbg("applied mode=%#o to '%s'", rule->mode, udev->dev->kernel);
 917                         }
 918                         if (!udev->owner_final && rule->owner.operation != KEY_OP_UNSET) {
 919                                 if (rule->owner.operation == KEY_OP_ASSIGN_FINAL)
 920                                         udev->owner_final = 1;
 921                                 strlcpy(udev->owner, key_val(rule, &rule->owner), sizeof(udev->owner));
 922                                 udev_rules_apply_format(udev, udev->owner, sizeof(udev->owner));
 923                                 dbg("applied owner='%s' to '%s'", udev->owner, udev->dev->kernel);
 924                         }
 925                         if (!udev->group_final && rule->group.operation != KEY_OP_UNSET) {
 926                                 if (rule->group.operation == KEY_OP_ASSIGN_FINAL)
 927                                         udev->group_final = 1;
 928                                 strlcpy(udev->group, key_val(rule, &rule->group), sizeof(udev->group));
 929                                 udev_rules_apply_format(udev, udev->group, sizeof(udev->group));
 930                                 dbg("applied group='%s' to '%s'", udev->group, udev->dev->kernel);
 931                         }
 932
 933                         /* collect symlinks */
 934                         if (!udev->symlink_final && rule->symlink.operation != KEY_OP_UNSET) {
 935                                 char temp[PATH_SIZE];
 936                                 char *pos, *next;
 937                                 int count;
 938
 939                                 if (rule->symlink.operation == KEY_OP_ASSIGN_FINAL)
 940                                         udev->symlink_final = 1;
 941                                 if (rule->symlink.operation == KEY_OP_ASSIGN || rule->symlink.operation == KEY_OP_ASSIGN_FINAL) {
 942                                         info("reset symlink list");
 943                                         name_list_cleanup(&udev->symlink_list);
 944                                 }
 945                                 strlcpy(temp, key_val(rule, &rule->symlink), sizeof(temp));
 946                                 udev_rules_apply_format(udev, temp, sizeof(temp));
 947                                 count = replace_untrusted_chars(temp);
 948                                 if (count)
 949                                         info("%i untrusted character(s) replaced" , count);
 950                                 dbg("rule applied, added symlink(s) '%s'", temp);
 951
 952                                 /* add multiple symlinks separated by spaces */
 953                                 pos = temp;
 954                                 while (isspace(pos[0]))
 955                                         pos++;
 956                                 next = strchr(pos, ' ');
 957                                 while (next) {
 958                                         next[0] = '\0';
 959                                         info("add symlink '%s'", pos);
 960                                         name_list_add(&udev->symlink_list, pos, 0);
 961                                         while (isspace(next[1]))
 962                                                 next++;
 963                                         pos = &next[1];
 964                                         next = strchr(pos, ' ');
 965                                 }
 966                                 if (pos[0] != '\0') {
 967                                         info("add symlink '%s'", pos);
 968                                         name_list_add(&udev->symlink_list, pos, 0);
 969                                 }
 970                         }
 971
 972                         /* set name, later rules with name set will be ignored */
 973                         if (rule->name.operation == KEY_OP_ASSIGN ||
 974                             rule->name.operation == KEY_OP_ASSIGN_FINAL ||
 975                             rule->name.operation == KEY_OP_ADD) {
 976                                 int count;
 977
 978                                 name_set = 1;
 979                                 strlcpy(udev->name, key_val(rule, &rule->name), sizeof(udev->name));
 980                                 udev_rules_apply_format(udev, udev->name, sizeof(udev->name));
 981                                 count = replace_untrusted_chars(udev->name);
 982                                 if (count)
 983                                         info("%i untrusted character(s) replaced", count);
 984
 985                                 info("rule applied, '%s' becomes '%s'", udev->dev->kernel, udev->name);
 986                                 if (strcmp(udev->dev->subsystem, "net") != 0)
 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                                 if (rule->run.operation == KEY_OP_ASSIGN_FINAL)
 993                                         udev->run_final = 1;
 994                                 if (rule->run.operation == KEY_OP_ASSIGN || rule->run.operation == KEY_OP_ASSIGN_FINAL) {
 995                                         info("reset run list");
 996                                         name_list_cleanup(&udev->run_list);
 997                                 }
 998                                 dbg("add run '%s'", key_val(rule, &rule->run));
 999                                 name_list_add(&udev->run_list, key_val(rule, &rule->run), 0);
1000                         }
1001
1002                         if (rule->last_rule) {
1003                                 dbg("last rule to be applied");
1004                                 break;
1005                         }
1006
1007                         if (rule->goto_label.operation != KEY_OP_UNSET) {
1008                                 dbg("moving forward to label '%s'", key_val(rule, &rule->goto_label));
1009                                 udev_rules_iter_label(rules, key_val(rule, &rule->goto_label));
1010                         }
1011                 }
1012         }
1013
1014         if (!name_set) {
1015                 strlcpy(udev->name, udev->dev->kernel, sizeof(udev->name));
1016                 info("no node name set, will use kernel name '%s'", udev->name);
1017         }
1018
1019         if (udev->tmp_node[0] != '\0') {
1020                 dbg("removing temporary device node");
1021                 unlink_secure(udev->tmp_node);
1022                 udev->tmp_node[0] = '\0';
1023         }
1024
1025         return 0;
1026 }
1027
1028 int udev_rules_get_run(struct udev_rules *rules, struct udevice *udev)
1029 {
1030         struct udev_rule *rule;
1031
1032         dbg("udev->kernel='%s'", udev->dev->kernel);
1033
1034         /* look for a matching rule to apply */
1035         udev_rules_iter_init(rules);
1036         while (1) {
1037                 rule = udev_rules_iter_next(rules);
1038                 if (rule == NULL)
1039                         break;
1040
1041                 dbg("process rule");
1042                 if (rule->name.operation != KEY_OP_UNSET || rule->symlink.operation != KEY_OP_UNSET ||
1043                     rule->mode_operation != KEY_OP_UNSET || rule->owner.operation != KEY_OP_UNSET || rule->group.operation != KEY_OP_UNSET) {
1044                         dbg("skip rule that names a device");
1045                         continue;
1046                 }
1047
1048                 if (match_rule(udev, rule) == 0) {
1049                         if (rule->ignore_device) {
1050                                 info("rule applied, '%s' is ignored", udev->dev->kernel);
1051                                 udev->ignore_device = 1;
1052                                 return 0;
1053                         }
1054
1055                         if (!udev->run_final && rule->run.operation != KEY_OP_UNSET) {
1056                                 if (rule->run.operation == KEY_OP_ASSIGN || rule->run.operation == KEY_OP_ASSIGN_FINAL) {
1057                                         info("reset run list");
1058                                         name_list_cleanup(&udev->run_list);
1059                                 }
1060                                 dbg("add run '%s'", key_val(rule, &rule->run));
1061                                 name_list_add(&udev->run_list, key_val(rule, &rule->run), 0);
1062                                 if (rule->run.operation == KEY_OP_ASSIGN_FINAL)
1063                                         break;
1064                         }
1065
1066                         if (rule->last_rule) {
1067                                 dbg("last rule to be applied");
1068                                 break;
1069                         }
1070
1071                         if (rule->goto_label.operation != KEY_OP_UNSET) {
1072                                 dbg("moving forward to label '%s'", key_val(rule, &rule->goto_label));
1073                                 udev_rules_iter_label(rules, key_val(rule, &rule->goto_label));
1074                         }
1075                 }
1076         }
1077
1078         return 0;
1079 }