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                         } else if (head[0] == '%') {
 368                                 /* substitute format char */
 369                                 if (head[1] == '\0')
 370                                         break;
 371                                 if (head[1] == '%') {
 372                                         strlcpy(temp, head+2, sizeof(temp));
 373                                         strlcpy(head+1, temp, maxsize);
 374                                         head++;
 375                                         continue;
 376                                 }
 377                                 head[0] = '\0';
 378                                 tail = head+1;
 379                                 len = get_format_len(&tail);
 380                                 for (subst = map; subst->name; subst++) {
 381                                         if (tail[0] == subst->fmt) {
 382                                                 type = subst->type;
 383                                                 tail++;
 384                                                 dbg("will substitute format char '%c'", subst->fmt);
 385                                                 goto found;
 386                                         }
 387                                 }
 388                         }
 389                         head++;
 390                 }
 391                 break;
 392 found:
 393                 attr = get_format_attribute(&tail);
 394                 strlcpy(temp, tail, sizeof(temp));
 395                 dbg("format=%i, string='%s', tail='%s'", type ,string, tail);
 396
 397                 switch (type) {
 398                 case SUBST_DEVPATH:
 399                         strlcat(string, udev->dev->devpath, maxsize);
 400                         dbg("substitute devpath '%s'", udev->dev->devpath);
 401                         break;
 402                 case SUBST_KERNEL:
 403                         strlcat(string, udev->dev->kernel, maxsize);
 404                         dbg("substitute kernel name '%s'", udev->dev->kernel);
 405                         break;
 406                 case SUBST_KERNEL_NUMBER:
 407                         strlcat(string, udev->dev->kernel_number, maxsize);
 408                         dbg("substitute kernel number '%s'", udev->dev->kernel_number);
 409                         break;
 410                 case SUBST_ID:
 411                         if (udev->dev_parent != NULL) {
 412                                 strlcat(string, udev->dev_parent->kernel, maxsize);
 413                                 dbg("substitute id '%s'", udev->dev_parent->kernel);
 414                         }
 415                         break;
 416                 case SUBST_MAJOR:
 417                         sprintf(temp2, "%d", major(udev->devt));
 418                         strlcat(string, temp2, maxsize);
 419                         dbg("substitute major number '%s'", temp2);
 420                         break;
 421                 case SUBST_MINOR:
 422                         sprintf(temp2, "%d", minor(udev->devt));
 423                         strlcat(string, temp2, maxsize);
 424                         dbg("substitute minor number '%s'", temp2);
 425                         break;
 426                 case SUBST_RESULT:
 427                         if (udev->program_result[0] == '\0')
 428                                 break;
 429                         /* get part part of the result string */
 430                         i = 0;
 431                         if (attr != NULL)
 432                                 i = strtoul(attr, &rest, 10);
 433                         if (i > 0) {
 434                                 dbg("request part #%d of result string", i);
 435                                 cpos = udev->program_result;
 436                                 while (--i) {
 437                                         while (cpos[0] != '\0' && !isspace(cpos[0]))
 438                                                 cpos++;
 439                                         while (isspace(cpos[0]))
 440                                                 cpos++;
 441                                 }
 442                                 if (i > 0) {
 443                                         err("requested part of result string not found");
 444                                         break;
 445                                 }
 446                                 strlcpy(temp2, cpos, sizeof(temp2));
 447                                 /* %{2+}c copies the whole string from the second part on */
 448                                 if (rest[0] != '+') {
 449                                         cpos = strchr(temp2, ' ');
 450                                         if (cpos)
 451                                                 cpos[0] = '\0';
 452                                 }
 453                                 strlcat(string, temp2, maxsize);
 454                                 dbg("substitute part of result string '%s'", temp2);
 455                         } else {
 456                                 strlcat(string, udev->program_result, maxsize);
 457                                 dbg("substitute result string '%s'", udev->program_result);
 458                         }
 459                         break;
 460                 case SUBST_ATTR:
 461                         if (attr == NULL)
 462                                 err("missing file parameter for attr");
 463                         else {
 464                                 const char *value = NULL;
 465                                 size_t size;
 466
 467                                 /* first try the current device, other matches may have selected */
 468                                 if (udev->dev_parent != NULL && udev->dev_parent != udev->dev)
 469                                         value = sysfs_attr_get_value(udev->dev_parent->devpath, attr);
 470
 471                                 /* look at all devices along the chain of parents */
 472                                 if (value == NULL) {
 473                                         struct sysfs_device *dev_parent = udev->dev;
 474
 475                                         do {
 476                                                 dbg("looking at '%s'", dev_parent->devpath);
 477                                                 value = sysfs_attr_get_value(dev_parent->devpath, attr);
 478                                                 if (value != NULL) {
 479                                                         strlcpy(temp2, value, sizeof(temp2));
 480                                                         break;
 481                                                 }
 482                                                 dev_parent = sysfs_device_get_parent(dev_parent);
 483                                         } while (dev_parent != NULL);
 484                                 }
 485
 486                                 if (value == NULL)
 487                                         break;
 488
 489                                 /* strip trailing whitespace and replace untrusted characters of sysfs value */
 490                                 size = strlcpy(temp2, value, sizeof(temp2));
 491                                 if (size >= sizeof(temp2))
 492                                         size = sizeof(temp2)-1;
 493                                 while (size > 0 && isspace(temp2[size-1]))
 494                                         temp2[--size] = '\0';
 495                                 count = replace_untrusted_chars(temp2);
 496                                 if (count > 0)
 497                                         info("%i untrusted character(s) replaced" , count);
 498                                 strlcat(string, temp2, maxsize);
 499                                 dbg("substitute sysfs value '%s'", temp2);
 500                         }
 501                         break;
 502                 case SUBST_PARENT:
 503                         {
 504                                 struct sysfs_device *dev_parent;
 505
 506                                 dev_parent = sysfs_device_get_parent(udev->dev);
 507                                 if (dev_parent != NULL) {
 508                                         struct udevice *udev_parent;
 509
 510                                         dbg("found parent '%s', get the node name", dev_parent->devpath);
 511                                         udev_parent = udev_device_init();
 512                                         if (udev_parent != NULL) {
 513                                                 /* lookup the name in the udev_db with the DEVPATH of the parent */
 514                                                 if (udev_db_get_device(udev_parent, dev_parent->devpath) == 0) {
 515                                                         strlcat(string, udev_parent->name, maxsize);
 516                                                         dbg("substitute parent node name'%s'", udev_parent->name);
 517                                                 } else
 518                                                         dbg("parent not found in database");
 519                                                 udev_device_cleanup(udev_parent);
 520                                         }
 521                                 }
 522                         }
 523                         break;
 524                 case SUBST_TEMP_NODE:
 525                         if (udev->tmp_node[0] == '\0') {
 526                                 dbg("create temporary device node for callout");
 527                                 snprintf(udev->tmp_node, sizeof(udev->tmp_node), "%s/.tmp-%u-%u",
 528                                          udev_root, major(udev->devt), minor(udev->devt));
 529                                 udev->tmp_node[sizeof(udev->tmp_node)-1] = '\0';
 530                                 udev_node_mknod(udev, udev->tmp_node, udev->devt, 0600, 0, 0);
 531                         }
 532                         strlcat(string, udev->tmp_node, maxsize);
 533                         dbg("substitute temporary device node name '%s'", udev->tmp_node);
 534                         break;
 535                 case SUBST_ROOT:
 536                         strlcat(string, udev_root, maxsize);
 537                         dbg("substitute udev_root '%s'", udev_root);
 538                         break;
 539                 case SUBST_ENV:
 540                         if (attr == NULL) {
 541                                 dbg("missing attribute");
 542                                 break;
 543                         }
 544                         pos = getenv(attr);
 545                         if (pos == NULL) {
 546                                 dbg("env '%s' not available", attr);
 547                                 break;
 548                         }
 549                         dbg("substitute env '%s=%s'", attr, pos);
 550                         strlcat(string, pos, maxsize);
 551                         break;
 552                 default:
 553                         err("unknown substitution type=%i", type);
 554                         break;
 555                 }
 556                 /* possibly truncate to format-char specified length */
 557                 if (len != -1) {
 558                         head[len] = '\0';
 559                         dbg("truncate to %i chars, subtitution string becomes '%s'", len, head);
 560                 }
 561                 strlcat(string, temp, maxsize);
 562         }
 563 }
 564
 565 static char *key_val(struct udev_rule *rule, struct key *key)
 566 {
 567         return rule->buf + key->val_off;
 568 }
 569
 570 static char *key_pair_name(struct udev_rule *rule, struct key_pair *pair)
 571 {
 572         return rule->buf + pair->key_name_off;
 573 }
 574
 575 static int match_key(const char *key_name, struct udev_rule *rule, struct key *key, const char *val)
 576 {
 577         int match;
 578         char value[PATH_SIZE];
 579         char *key_value;
 580         char *pos;
 581
 582         if (key->operation != KEY_OP_MATCH &&
 583             key->operation != KEY_OP_NOMATCH)
 584                 return 0;
 585
 586         strlcpy(value, rule->buf + key->val_off, sizeof(value));
 587         key_value = value;
 588
 589         dbg("key %s value='%s'", key_name, key_value);
 590         while (key_value) {
 591                 pos = strchr(key_value, '|');
 592                 if (pos) {
 593                         pos[0] = '\0';
 594                         pos++;
 595                 }
 596                 dbg("match %s '%s' <-> '%s'", key_name, key_value, val);
 597                 match = (fnmatch(key_value, val, 0) == 0);
 598                 if (match && (key->operation != KEY_OP_NOMATCH)) {
 599                         dbg("%s is true (matching value)", key_name);
 600                         return 0;
 601                 }
 602                 if (!match && (key->operation == KEY_OP_NOMATCH)) {
 603                         dbg("%s is true (non-matching value)", key_name);
 604                         return 0;
 605                 }
 606                 key_value = pos;
 607         }
 608         dbg("%s is false", key_name);
 609         return -1;
 610 }
 611
 612 /* match a single rule against a given device and possibly its parent devices */
 613 static int match_rule(struct udevice *udev, struct udev_rule *rule)
 614 {
 615         int i;
 616
 617         if (match_key("ACTION", rule, &rule->action, udev->action))
 618                 goto nomatch;
 619
 620         if (match_key("KERNEL", rule, &rule->kernel, udev->dev->kernel))
 621                 goto nomatch;
 622
 623         if (match_key("SUBSYSTEM", rule, &rule->subsystem, udev->dev->subsystem))
 624                 goto nomatch;
 625
 626         if (match_key("DEVPATH", rule, &rule->devpath, udev->dev->devpath))
 627                 goto nomatch;
 628
 629         if (match_key("DRIVER", rule, &rule->driver, udev->dev->driver))
 630                 goto nomatch;
 631
 632         /* match NAME against a value assigned by an earlier rule */
 633         if (match_key("NAME", rule, &rule->name, udev->name))
 634                 goto nomatch;
 635
 636         for (i = 0; i < rule->env.count; i++) {
 637                 struct key_pair *pair = &rule->env.keys[i];
 638
 639                 /* we only check for matches, assignments will be handled later */
 640                 if (pair->key.operation == KEY_OP_MATCH ||
 641                     pair->key.operation == KEY_OP_NOMATCH) {
 642                         const char *key_name = key_pair_name(rule, pair);
 643                         const char *value = getenv(key_name);
 644
 645                         if (!value) {
 646                                 dbg("ENV{'%s'} is not set, treat as empty", key_name);
 647                                 value = "";
 648                         }
 649                         if (match_key("ENV", rule, &pair->key, value))
 650                                 goto nomatch;
 651                 }
 652         }
 653
 654         if (rule->wait_for_sysfs.operation != KEY_OP_UNSET) {
 655                 int found;
 656
 657                 found = (wait_for_sysfs(udev, key_val(rule, &rule->wait_for_sysfs), 3) == 0);
 658                 if (!found && (rule->wait_for_sysfs.operation != KEY_OP_NOMATCH))
 659                         goto nomatch;
 660         }
 661
 662         /* check for matching sysfs attribute pairs */
 663         for (i = 0; i < rule->attr.count; i++) {
 664                 struct key_pair *pair = &rule->attr.keys[i];
 665
 666                 if (pair->key.operation == KEY_OP_MATCH ||
 667                     pair->key.operation == KEY_OP_NOMATCH) {
 668                         const char *key_name = key_pair_name(rule, pair);
 669                         const char *key_value = key_val(rule, &pair->key);
 670                         const char *value;
 671                         char val[VALUE_SIZE];
 672                         size_t len;
 673
 674                         value = sysfs_attr_get_value(udev->dev->devpath, key_name);
 675                         if (value == NULL)
 676                                 goto nomatch;
 677                         strlcpy(val, value, sizeof(val));
 678
 679                         /* strip trailing whitespace of value, if not asked to match for it */
 680                         len = strlen(key_value);
 681                         if (len > 0 && !isspace(key_value[len-1])) {
 682                                 len = strlen(val);
 683                                 while (len > 0 && isspace(val[len-1]))
 684                                         val[--len] = '\0';
 685                                 dbg("removed %zi trailing whitespace chars from '%s'", strlen(val)-len, val);
 686                         }
 687
 688                         if (match_key("ATTR", rule, &pair->key, val))
 689                                 goto nomatch;
 690                 }
 691         }
 692
 693         /* walk up the chain of parent devices and find a match */
 694         udev->dev_parent = udev->dev;
 695         while (1) {
 696                 /* check for matching kernel device name */
 697                 if (match_key("KERNELS", rule, &rule->kernels, udev->dev_parent->kernel))
 698                         goto try_parent;
 699
 700                 /* check for matching subsystem value */
 701                 if (match_key("SUBSYSTEMS", rule, &rule->subsystems, udev->dev_parent->subsystem))
 702                         goto try_parent;
 703
 704                 /* check for matching driver */
 705                 if (match_key("DRIVERS", rule, &rule->drivers, udev->dev_parent->driver))
 706                         goto try_parent;
 707
 708                 /* check for matching sysfs attribute pairs */
 709                 for (i = 0; i < rule->attrs.count; i++) {
 710                         struct key_pair *pair = &rule->attrs.keys[i];
 711
 712                         if (pair->key.operation == KEY_OP_MATCH ||
 713                             pair->key.operation == KEY_OP_NOMATCH) {
 714                                 const char *key_name = key_pair_name(rule, pair);
 715                                 const char *key_value = key_val(rule, &pair->key);
 716                                 const char *value;
 717                                 char val[VALUE_SIZE];
 718                                 size_t len;
 719
 720                                 value = sysfs_attr_get_value(udev->dev_parent->devpath, key_name);
 721                                 if (value == NULL)
 722                                         value = sysfs_attr_get_value(udev->dev->devpath, key_name);
 723                                 if (value == NULL)
 724                                         goto try_parent;
 725                                 strlcpy(val, value, sizeof(val));
 726
 727                                 /* strip trailing whitespace of value, if not asked to match for it */
 728                                 len = strlen(key_value);
 729                                 if (len > 0 && !isspace(key_value[len-1])) {
 730                                         len = strlen(val);
 731                                         while (len > 0 && isspace(val[len-1]))
 732                                                 val[--len] = '\0';
 733                                         dbg("removed %zi trailing whitespace chars from '%s'", strlen(val)-len, val);
 734                                 }
 735
 736                                 if (match_key("ATTRS", rule, &pair->key, val))
 737                                         goto try_parent;
 738                         }
 739                 }
 740
 741                 /* found matching device  */
 742                 break;
 743 try_parent:
 744                 /* move to parent device */
 745                 dbg("try parent sysfs device");
 746                 udev->dev_parent = sysfs_device_get_parent(udev->dev_parent);
 747                 if (udev->dev_parent == NULL)
 748                         goto nomatch;
 749                 dbg("looking at dev_parent->devpath='%s'", udev->dev_parent->devpath);
 750                 dbg("looking at dev_parent->kernel='%s'", udev->dev_parent->kernel);
 751         }
 752
 753         /* execute external program */
 754         if (rule->program.operation != KEY_OP_UNSET) {
 755                 char program[PATH_SIZE];
 756                 char result[PATH_SIZE];
 757
 758                 strlcpy(program, key_val(rule, &rule->program), sizeof(program));
 759                 udev_rules_apply_format(udev, program, sizeof(program));
 760                 if (run_program(program, udev->dev->subsystem, result, sizeof(result), NULL, (udev_log_priority >= LOG_INFO)) != 0) {
 761                         dbg("PROGRAM is false");
 762                         udev->program_result[0] = '\0';
 763                         if (rule->program.operation != KEY_OP_NOMATCH)
 764                                 goto nomatch;
 765                 } else {
 766                         int count;
 767
 768                         dbg("PROGRAM matches");
 769                         remove_trailing_chars(result, '\n');
 770                         count = replace_untrusted_chars(result);
 771                         if (count)
 772                                 info("%i untrusted character(s) replaced" , count);
 773                         dbg("result is '%s'", result);
 774                         strlcpy(udev->program_result, result, sizeof(udev->program_result));
 775                         dbg("PROGRAM returned successful");
 776                         if (rule->program.operation == KEY_OP_NOMATCH)
 777                                 goto nomatch;
 778                 }
 779                 dbg("PROGRAM key is true");
 780         }
 781
 782         /* check for matching result of external program */
 783         if (match_key("RESULT", rule, &rule->result, udev->program_result))
 784                 goto nomatch;
 785
 786         /* import variables returned from program or or file into environment */
 787         if (rule->import.operation != KEY_OP_UNSET) {
 788                 char import[PATH_SIZE];
 789                 int rc = -1;
 790
 791                 strlcpy(import, key_val(rule, &rule->import), sizeof(import));
 792                 udev_rules_apply_format(udev, import, sizeof(import));
 793                 dbg("check for IMPORT import='%s'", import);
 794                 if (rule->import_type == IMPORT_PROGRAM) {
 795                         rc = import_program_into_env(udev, import);
 796                 } else if (rule->import_type == IMPORT_FILE) {
 797                         dbg("import file import='%s'", import);
 798                         rc = import_file_into_env(udev, import);
 799                 } else if (rule->import_type == IMPORT_PARENT) {
 800                         dbg("import parent import='%s'", import);
 801                         rc = import_parent_into_env(udev, import);
 802                 }
 803                 if (rc != 0) {
 804                         dbg("IMPORT failed");
 805                         if (rule->import.operation != KEY_OP_NOMATCH)
 806                                 goto nomatch;
 807                 } else
 808                         dbg("IMPORT '%s' imported", key_val(rule, &rule->import));
 809                 dbg("IMPORT key is true");
 810         }
 811
 812         /* rule matches, if we have ENV assignments export it */
 813         for (i = 0; i < rule->env.count; i++) {
 814                 struct key_pair *pair = &rule->env.keys[i];
 815
 816                 if (pair->key.operation == KEY_OP_ASSIGN) {
 817                         char temp_value[NAME_SIZE];
 818                         const char *key_name = key_pair_name(rule, pair);
 819                         const char *value = key_val(rule, &pair->key);
 820                         char *key_value;
 821
 822                         /* make sure we don't write to the same string we possibly read from */
 823                         strlcpy(temp_value, value, sizeof(temp_value));
 824                         udev_rules_apply_format(udev, temp_value, NAME_SIZE);
 825
 826                         key_value = name_list_key_add(&udev->env_list, key_name, temp_value);
 827                         if (key_value == NULL)
 828                                 break;
 829
 830                         putenv(key_value);
 831                         dbg("export ENV '%s'", key_value);
 832                 }
 833         }
 834
 835         /* if we have ATTR assignements write value to sysfs file */
 836         for (i = 0; i < rule->attr.count; i++) {
 837                 struct key_pair *pair = &rule->attr.keys[i];
 838
 839                 if (pair->key.operation == KEY_OP_ASSIGN) {
 840                         const char *key_name = key_pair_name(rule, pair);
 841                         const char *key_value = key_val(rule, &pair->key);
 842                         char attr[PATH_SIZE];
 843                         FILE *f;
 844
 845                         strlcpy(attr, sysfs_path, sizeof(attr));
 846                         strlcat(attr, udev->dev->devpath, sizeof(attr));
 847                         strlcat(attr, "/", sizeof(attr));
 848                         strlcat(attr, key_name, sizeof(attr));
 849                         dbg("write '%s' to '%s'", key_value, attr);
 850                         f = fopen(attr, "w");
 851                         if (f != NULL) {
 852                                 if (fprintf(f, "%s\n", key_value) <= 0)
 853                                         err("error writing ATTR{%s}: %s", attr, strerror(errno));
 854                                 fclose(f);
 855                         } else
 856                                 err("error opening ATTR{%s} for writing: %s", attr, strerror(errno));
 857                 }
 858         }
 859         return 0;
 860
 861 nomatch:
 862         return -1;
 863 }
 864
 865 int udev_rules_get_name(struct udev_rules *rules, struct udevice *udev)
 866 {
 867         struct udev_rule *rule;
 868         int name_set = 0;
 869
 870         dbg("udev->dev->devpath='%s'", udev->dev->devpath);
 871         dbg("udev->dev->kernel='%s'", udev->dev->kernel);
 872
 873         /* look for a matching rule to apply */
 874         udev_rules_iter_init(rules);
 875         while (1) {
 876                 rule = udev_rules_iter_next(rules);
 877                 if (rule == NULL)
 878                         break;
 879
 880                 if (name_set &&
 881                     (rule->name.operation == KEY_OP_ASSIGN ||
 882                      rule->name.operation == KEY_OP_ASSIGN_FINAL ||
 883                      rule->name.operation == KEY_OP_ADD)) {
 884                         dbg("node name already set, rule ignored");
 885                         continue;
 886                 }
 887
 888                 dbg("process rule");
 889                 if (match_rule(udev, rule) == 0) {
 890                         /* apply options */
 891                         if (rule->ignore_device) {
 892                                 info("rule applied, '%s' is ignored", udev->dev->kernel);
 893                                 udev->ignore_device = 1;
 894                                 return 0;
 895                         }
 896                         if (rule->ignore_remove) {
 897                                 udev->ignore_remove = 1;
 898                                 dbg("remove event should be ignored");
 899                         }
 900                         /* apply all_partitions option only at a main block device */
 901                         if (rule->partitions &&
 902                             strcmp(udev->dev->subsystem, "block") == 0 && udev->dev->kernel_number[0] == '\0') {
 903                                 udev->partitions = rule->partitions;
 904                                 dbg("creation of partition nodes requested");
 905                         }
 906
 907                         /* apply permissions */
 908                         if (!udev->mode_final && rule->mode != 0000) {
 909                                 if (rule->mode_operation == KEY_OP_ASSIGN_FINAL)
 910                                         udev->mode_final = 1;
 911                                 udev->mode = rule->mode;
 912                                 dbg("applied mode=%#o to '%s'", rule->mode, udev->dev->kernel);
 913                         }
 914                         if (!udev->owner_final && rule->owner.operation != KEY_OP_UNSET) {
 915                                 if (rule->owner.operation == KEY_OP_ASSIGN_FINAL)
 916                                         udev->owner_final = 1;
 917                                 strlcpy(udev->owner, key_val(rule, &rule->owner), sizeof(udev->owner));
 918                                 udev_rules_apply_format(udev, udev->owner, sizeof(udev->owner));
 919                                 dbg("applied owner='%s' to '%s'", udev->owner, udev->dev->kernel);
 920                         }
 921                         if (!udev->group_final && rule->group.operation != KEY_OP_UNSET) {
 922                                 if (rule->group.operation == KEY_OP_ASSIGN_FINAL)
 923                                         udev->group_final = 1;
 924                                 strlcpy(udev->group, key_val(rule, &rule->group), sizeof(udev->group));
 925                                 udev_rules_apply_format(udev, udev->group, sizeof(udev->group));
 926                                 dbg("applied group='%s' to '%s'", udev->group, udev->dev->kernel);
 927                         }
 928
 929                         /* collect symlinks */
 930                         if (!udev->symlink_final && rule->symlink.operation != KEY_OP_UNSET) {
 931                                 char temp[PATH_SIZE];
 932                                 char *pos, *next;
 933                                 int count;
 934
 935                                 if (rule->symlink.operation == KEY_OP_ASSIGN_FINAL)
 936                                         udev->symlink_final = 1;
 937                                 if (rule->symlink.operation == KEY_OP_ASSIGN || rule->symlink.operation == KEY_OP_ASSIGN_FINAL) {
 938                                         info("reset symlink list");
 939                                         name_list_cleanup(&udev->symlink_list);
 940                                 }
 941                                 strlcpy(temp, key_val(rule, &rule->symlink), sizeof(temp));
 942                                 udev_rules_apply_format(udev, temp, sizeof(temp));
 943                                 count = replace_untrusted_chars(temp);
 944                                 if (count)
 945                                         info("%i untrusted character(s) replaced" , count);
 946                                 dbg("rule applied, added symlink(s) '%s'", temp);
 947
 948                                 /* add multiple symlinks separated by spaces */
 949                                 pos = temp;
 950                                 while (isspace(pos[0]))
 951                                         pos++;
 952                                 next = strchr(pos, ' ');
 953                                 while (next) {
 954                                         next[0] = '\0';
 955                                         info("add symlink '%s'", pos);
 956                                         name_list_add(&udev->symlink_list, pos, 0);
 957                                         while (isspace(next[1]))
 958                                                 next++;
 959                                         pos = &next[1];
 960                                         next = strchr(pos, ' ');
 961                                 }
 962                                 if (pos[0] != '\0') {
 963                                         info("add symlink '%s'", pos);
 964                                         name_list_add(&udev->symlink_list, pos, 0);
 965                                 }
 966                         }
 967
 968                         /* set name, later rules with name set will be ignored */
 969                         if (rule->name.operation == KEY_OP_ASSIGN ||
 970                             rule->name.operation == KEY_OP_ASSIGN_FINAL ||
 971                             rule->name.operation == KEY_OP_ADD) {
 972                                 int count;
 973
 974                                 name_set = 1;
 975                                 strlcpy(udev->name, key_val(rule, &rule->name), sizeof(udev->name));
 976                                 udev_rules_apply_format(udev, udev->name, sizeof(udev->name));
 977                                 count = replace_untrusted_chars(udev->name);
 978                                 if (count)
 979                                         info("%i untrusted character(s) replaced", count);
 980
 981                                 info("rule applied, '%s' becomes '%s'", udev->dev->kernel, udev->name);
 982                                 if (strcmp(udev->dev->subsystem, "net") != 0)
 983                                         dbg("name, '%s' is going to have owner='%s', group='%s', mode=%#o partitions=%i",
 984                                             udev->name, udev->owner, udev->group, udev->mode, udev->partitions);
 985                         }
 986
 987                         if (!udev->run_final && rule->run.operation != KEY_OP_UNSET) {
 988                                 if (rule->run.operation == KEY_OP_ASSIGN_FINAL)
 989                                         udev->run_final = 1;
 990                                 if (rule->run.operation == KEY_OP_ASSIGN || rule->run.operation == KEY_OP_ASSIGN_FINAL) {
 991                                         info("reset run list");
 992                                         name_list_cleanup(&udev->run_list);
 993                                 }
 994                                 dbg("add run '%s'", key_val(rule, &rule->run));
 995                                 name_list_add(&udev->run_list, key_val(rule, &rule->run), 0);
 996                         }
 997
 998                         if (rule->last_rule) {
 999                                 dbg("last rule to be applied");
1000                                 break;
1001                         }
1002
1003                         if (rule->goto_label.operation != KEY_OP_UNSET) {
1004                                 dbg("moving forward to label '%s'", key_val(rule, &rule->goto_label));
1005                                 udev_rules_iter_label(rules, key_val(rule, &rule->goto_label));
1006                         }
1007                 }
1008         }
1009
1010         if (!name_set) {
1011                 strlcpy(udev->name, udev->dev->kernel, sizeof(udev->name));
1012                 info("no node name set, will use kernel name '%s'", udev->name);
1013         }
1014
1015         if (udev->tmp_node[0] != '\0') {
1016                 dbg("removing temporary device node");
1017                 unlink_secure(udev->tmp_node);
1018                 udev->tmp_node[0] = '\0';
1019         }
1020
1021         return 0;
1022 }
1023
1024 int udev_rules_get_run(struct udev_rules *rules, struct udevice *udev)
1025 {
1026         struct udev_rule *rule;
1027
1028         dbg("udev->kernel='%s'", udev->dev->kernel);
1029
1030         /* look for a matching rule to apply */
1031         udev_rules_iter_init(rules);
1032         while (1) {
1033                 rule = udev_rules_iter_next(rules);
1034                 if (rule == NULL)
1035                         break;
1036
1037                 dbg("process rule");
1038                 if (rule->name.operation != KEY_OP_UNSET || rule->symlink.operation != KEY_OP_UNSET ||
1039                     rule->mode_operation != KEY_OP_UNSET || rule->owner.operation != KEY_OP_UNSET || rule->group.operation != KEY_OP_UNSET) {
1040                         dbg("skip rule that names a device");
1041                         continue;
1042                 }
1043
1044                 if (match_rule(udev, rule) == 0) {
1045                         if (rule->ignore_device) {
1046                                 info("rule applied, '%s' is ignored", udev->dev->kernel);
1047                                 udev->ignore_device = 1;
1048                                 return 0;
1049                         }
1050
1051                         if (!udev->run_final && rule->run.operation != KEY_OP_UNSET) {
1052                                 if (rule->run.operation == KEY_OP_ASSIGN || rule->run.operation == KEY_OP_ASSIGN_FINAL) {
1053                                         info("reset run list");
1054                                         name_list_cleanup(&udev->run_list);
1055                                 }
1056                                 dbg("add run '%s'", key_val(rule, &rule->run));
1057                                 name_list_add(&udev->run_list, key_val(rule, &rule->run), 0);
1058                                 if (rule->run.operation == KEY_OP_ASSIGN_FINAL)
1059                                         break;
1060                         }
1061
1062                         if (rule->last_rule) {
1063                                 dbg("last rule to be applied");
1064                                 break;
1065                         }
1066
1067                         if (rule->goto_label.operation != KEY_OP_UNSET) {
1068                                 dbg("moving forward to label '%s'", key_val(rule, &rule->goto_label));
1069                                 udev_rules_iter_label(rules, key_val(rule, &rule->goto_label));
1070                         }
1071                 }
1072         }
1073
1074         return 0;
1075 }