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
 190                         /* handle device, renamed by external tool, returning new path */
 191                         if (strcmp(variable, "DEVPATH") == 0) {
 192                                 info("updating devpath from '%s' to '%s'", udev->dev->devpath, value);
 193                                 sysfs_device_set_values(udev->dev, value, NULL, NULL);
 194                         } else
 195                                 name_list_key_add(&udev->env_list, variable, value);
 196                         setenv(variable, value, 1);
 197                 }
 198         }
 199
 200         return 0;
 201 }
 202
 203 static int import_file_into_env(struct udevice *udev, const char *filename)
 204 {
 205         char *buf;
 206         size_t bufsize;
 207
 208         if (file_map(filename, &buf, &bufsize) != 0) {
 209                 err("can't open '%s': %s", filename, strerror(errno));
 210                 return -1;
 211         }
 212         import_keys_into_env(udev, buf, bufsize);
 213         file_unmap(buf, bufsize);
 214
 215         return 0;
 216 }
 217
 218 static int import_program_into_env(struct udevice *udev, const char *program)
 219 {
 220         char result[1024];
 221         size_t reslen;
 222
 223         if (run_program(program, udev->dev->subsystem, result, sizeof(result), &reslen, (udev_log_priority >= LOG_INFO)) != 0)
 224                 return -1;
 225         return import_keys_into_env(udev, result, reslen);
 226 }
 227
 228 static int import_parent_into_env(struct udevice *udev, const char *filter)
 229 {
 230         struct sysfs_device *dev_parent;
 231         int rc = -1;
 232
 233         dev_parent = sysfs_device_get_parent(udev->dev);
 234         if (dev_parent != NULL) {
 235                 struct udevice *udev_parent;
 236                 struct name_entry *name_loop;
 237
 238                 dbg("found parent '%s', get the node name", dev_parent->devpath);
 239                 udev_parent = udev_device_init(NULL);
 240                 if (udev_parent == NULL)
 241                         return -1;
 242                 /* import the udev_db of the parent */
 243                 if (udev_db_get_device(udev_parent, dev_parent->devpath) == 0) {
 244                         dbg("import stored parent env '%s'", udev_parent->name);
 245                         list_for_each_entry(name_loop, &udev_parent->env_list, node) {
 246                                 char name[NAME_SIZE];
 247                                 char *pos;
 248
 249                                 strlcpy(name, name_loop->name, sizeof(name));
 250                                 pos = strchr(name, '=');
 251                                 if (pos) {
 252                                         pos[0] = '\0';
 253                                         pos++;
 254                                         if (fnmatch(filter, name, 0) == 0) {
 255                                                 dbg("import key '%s'", name_loop->name);
 256                                                 name_list_add(&udev->env_list, name_loop->name, 0);
 257                                                 setenv(name, pos, 1);
 258                                         } else
 259                                                 dbg("skip key '%s'", name_loop->name);
 260                                 }
 261                         }
 262                         rc = 0;
 263                 } else
 264                         dbg("parent not found in database");
 265                 udev_device_cleanup(udev_parent);
 266         }
 267
 268         return rc;
 269 }
 270
 271 #define WAIT_LOOP_PER_SECOND            50
 272 static int wait_for_sysfs(struct udevice *udev, const char *file, int timeout)
 273 {
 274         char devicepath[PATH_SIZE];
 275         char filepath[PATH_SIZE];
 276         struct stat stats;
 277         int loop = timeout * WAIT_LOOP_PER_SECOND;
 278
 279         strlcpy(devicepath, sysfs_path, sizeof(devicepath));
 280         strlcat(devicepath, udev->dev->devpath, sizeof(devicepath));
 281         strlcpy(filepath, devicepath, sizeof(filepath));
 282         strlcat(filepath, "/", sizeof(filepath));
 283         strlcat(filepath, file, sizeof(filepath));
 284
 285         dbg("will wait %i sec for '%s'", timeout, filepath);
 286         while (--loop) {
 287                 /* lookup file */
 288                 if (stat(filepath, &stats) == 0) {
 289                         info("file '%s' appeared after %i loops", filepath, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
 290                         return 0;
 291                 }
 292                 /* make sure, the device did not disappear in the meantime */
 293                 if (stat(devicepath, &stats) != 0) {
 294                         info("device disappeared while waiting for '%s'", filepath);
 295                         return -2;
 296                 }
 297                 info("wait for '%s' for %i mseconds", filepath, 1000 / WAIT_LOOP_PER_SECOND);
 298                 usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
 299         }
 300         err("waiting for '%s' failed", filepath);
 301         return -1;
 302 }
 303
 304 void udev_rules_apply_format(struct udevice *udev, char *string, size_t maxsize)
 305 {
 306         char temp[PATH_SIZE];
 307         char temp2[PATH_SIZE];
 308         char *head, *tail, *pos, *cpos, *attr, *rest;
 309         int len;
 310         int i;
 311         int count;
 312         enum subst_type {
 313                 SUBST_UNKNOWN,
 314                 SUBST_DEVPATH,
 315                 SUBST_KERNEL,
 316                 SUBST_KERNEL_NUMBER,
 317                 SUBST_ID,
 318                 SUBST_MAJOR,
 319                 SUBST_MINOR,
 320                 SUBST_RESULT,
 321                 SUBST_ATTR,
 322                 SUBST_PARENT,
 323                 SUBST_TEMP_NODE,
 324                 SUBST_ROOT,
 325                 SUBST_ENV,
 326         };
 327         static const struct subst_map {
 328                 char *name;
 329                 char fmt;
 330                 enum subst_type type;
 331         } map[] = {
 332                 { .name = "devpath",    .fmt = 'p',     .type = SUBST_DEVPATH },
 333                 { .name = "number",     .fmt = 'n',     .type = SUBST_KERNEL_NUMBER },
 334                 { .name = "kernel",     .fmt = 'k',     .type = SUBST_KERNEL },
 335                 { .name = "id",         .fmt = 'b',     .type = SUBST_ID },
 336                 { .name = "major",      .fmt = 'M',     .type = SUBST_MAJOR },
 337                 { .name = "minor",      .fmt = 'm',     .type = SUBST_MINOR },
 338                 { .name = "result",     .fmt = 'c',     .type = SUBST_RESULT },
 339                 { .name = "attr",       .fmt = 's',     .type = SUBST_ATTR },
 340                 { .name = "sysfs",      .fmt = 's',     .type = SUBST_ATTR },
 341                 { .name = "parent",     .fmt = 'P',     .type = SUBST_PARENT },
 342                 { .name = "tempnode",   .fmt = 'N',     .type = SUBST_TEMP_NODE },
 343                 { .name = "root",       .fmt = 'r',     .type = SUBST_ROOT },
 344                 { .name = "env",        .fmt = 'E',     .type = SUBST_ENV },
 345                 { NULL, '\0', 0 }
 346         };
 347         enum subst_type type;
 348         const struct subst_map *subst;
 349
 350         head = string;
 351         while (1) {
 352                 len = -1;
 353                 while (head[0] != '\0') {
 354                         if (head[0] == '$') {
 355                                 /* substitute named variable */
 356                                 if (head[1] == '\0')
 357                                         break;
 358                                 if (head[1] == '$') {
 359                                         strlcpy(temp, head+2, sizeof(temp));
 360                                         strlcpy(head+1, temp, maxsize);
 361                                         head++;
 362                                         continue;
 363                                 }
 364                                 head[0] = '\0';
 365                                 for (subst = map; subst->name; subst++) {
 366                                         if (strncasecmp(&head[1], subst->name, strlen(subst->name)) == 0) {
 367                                                 type = subst->type;
 368                                                 tail = head + strlen(subst->name)+1;
 369                                                 dbg("will substitute format name '%s'", subst->name);
 370                                                 goto found;
 371                                         }
 372                                 }
 373                                 head[0] = '$';
 374                                 err("unknown format variable '%s'", head);
 375                         } else if (head[0] == '%') {
 376                                 /* substitute format char */
 377                                 if (head[1] == '\0')
 378                                         break;
 379                                 if (head[1] == '%') {
 380                                         strlcpy(temp, head+2, sizeof(temp));
 381                                         strlcpy(head+1, temp, maxsize);
 382                                         head++;
 383                                         continue;
 384                                 }
 385                                 head[0] = '\0';
 386                                 tail = head+1;
 387                                 len = get_format_len(&tail);
 388                                 for (subst = map; subst->name; subst++) {
 389                                         if (tail[0] == subst->fmt) {
 390                                                 type = subst->type;
 391                                                 tail++;
 392                                                 dbg("will substitute format char '%c'", subst->fmt);
 393                                                 goto found;
 394                                         }
 395                                 }
 396                                 head[0] = '%';
 397                                 err("unknown format char '%c'", tail[0]);
 398                         }
 399                         head++;
 400                 }
 401                 break;
 402 found:
 403                 attr = get_format_attribute(&tail);
 404                 strlcpy(temp, tail, sizeof(temp));
 405                 dbg("format=%i, string='%s', tail='%s'", type ,string, tail);
 406
 407                 switch (type) {
 408                 case SUBST_DEVPATH:
 409                         strlcat(string, udev->dev->devpath, maxsize);
 410                         dbg("substitute devpath '%s'", udev->dev->devpath);
 411                         break;
 412                 case SUBST_KERNEL:
 413                         strlcat(string, udev->dev->kernel, maxsize);
 414                         dbg("substitute kernel name '%s'", udev->dev->kernel);
 415                         break;
 416                 case SUBST_KERNEL_NUMBER:
 417                         strlcat(string, udev->dev->kernel_number, maxsize);
 418                         dbg("substitute kernel number '%s'", udev->dev->kernel_number);
 419                         break;
 420                 case SUBST_ID:
 421                         if (udev->dev_parent != NULL) {
 422                                 strlcat(string, udev->dev_parent->kernel, maxsize);
 423                                 dbg("substitute id '%s'", udev->dev_parent->kernel);
 424                         }
 425                         break;
 426                 case SUBST_MAJOR:
 427                         sprintf(temp2, "%d", major(udev->devt));
 428                         strlcat(string, temp2, maxsize);
 429                         dbg("substitute major number '%s'", temp2);
 430                         break;
 431                 case SUBST_MINOR:
 432                         sprintf(temp2, "%d", minor(udev->devt));
 433                         strlcat(string, temp2, maxsize);
 434                         dbg("substitute minor number '%s'", temp2);
 435                         break;
 436                 case SUBST_RESULT:
 437                         if (udev->program_result[0] == '\0')
 438                                 break;
 439                         /* get part part of the result string */
 440                         i = 0;
 441                         if (attr != NULL)
 442                                 i = strtoul(attr, &rest, 10);
 443                         if (i > 0) {
 444                                 dbg("request part #%d of result string", i);
 445                                 cpos = udev->program_result;
 446                                 while (--i) {
 447                                         while (cpos[0] != '\0' && !isspace(cpos[0]))
 448                                                 cpos++;
 449                                         while (isspace(cpos[0]))
 450                                                 cpos++;
 451                                 }
 452                                 if (i > 0) {
 453                                         err("requested part of result string not found");
 454                                         break;
 455                                 }
 456                                 strlcpy(temp2, cpos, sizeof(temp2));
 457                                 /* %{2+}c copies the whole string from the second part on */
 458                                 if (rest[0] != '+') {
 459                                         cpos = strchr(temp2, ' ');
 460                                         if (cpos)
 461                                                 cpos[0] = '\0';
 462                                 }
 463                                 strlcat(string, temp2, maxsize);
 464                                 dbg("substitute part of result string '%s'", temp2);
 465                         } else {
 466                                 strlcat(string, udev->program_result, maxsize);
 467                                 dbg("substitute result string '%s'", udev->program_result);
 468                         }
 469                         break;
 470                 case SUBST_ATTR:
 471                         if (attr == NULL)
 472                                 err("missing file parameter for attr");
 473                         else {
 474                                 const char *value = NULL;
 475                                 size_t size;
 476
 477                                 /* first try the current device, other matches may have selected */
 478                                 if (udev->dev_parent != NULL && udev->dev_parent != udev->dev)
 479                                         value = sysfs_attr_get_value(udev->dev_parent->devpath, attr);
 480
 481                                 /* look at all devices along the chain of parents */
 482                                 if (value == NULL) {
 483                                         struct sysfs_device *dev_parent = udev->dev;
 484
 485                                         do {
 486                                                 dbg("looking at '%s'", dev_parent->devpath);
 487                                                 value = sysfs_attr_get_value(dev_parent->devpath, attr);
 488                                                 if (value != NULL) {
 489                                                         strlcpy(temp2, value, sizeof(temp2));
 490                                                         break;
 491                                                 }
 492                                                 dev_parent = sysfs_device_get_parent(dev_parent);
 493                                         } while (dev_parent != NULL);
 494                                 }
 495
 496                                 if (value == NULL)
 497                                         break;
 498
 499                                 /* strip trailing whitespace and replace untrusted characters of sysfs value */
 500                                 size = strlcpy(temp2, value, sizeof(temp2));
 501                                 if (size >= sizeof(temp2))
 502                                         size = sizeof(temp2)-1;
 503                                 while (size > 0 && isspace(temp2[size-1]))
 504                                         temp2[--size] = '\0';
 505                                 count = replace_untrusted_chars(temp2);
 506                                 if (count > 0)
 507                                         info("%i untrusted character(s) replaced" , count);
 508                                 strlcat(string, temp2, maxsize);
 509                                 dbg("substitute sysfs value '%s'", temp2);
 510                         }
 511                         break;
 512                 case SUBST_PARENT:
 513                         {
 514                                 struct sysfs_device *dev_parent;
 515
 516                                 dev_parent = sysfs_device_get_parent(udev->dev);
 517                                 if (dev_parent != NULL) {
 518                                         struct udevice *udev_parent;
 519
 520                                         dbg("found parent '%s', get the node name", dev_parent->devpath);
 521                                         udev_parent = udev_device_init(NULL);
 522                                         if (udev_parent != NULL) {
 523                                                 /* lookup the name in the udev_db with the DEVPATH of the parent */
 524                                                 if (udev_db_get_device(udev_parent, dev_parent->devpath) == 0) {
 525                                                         strlcat(string, udev_parent->name, maxsize);
 526                                                         dbg("substitute parent node name'%s'", udev_parent->name);
 527                                                 } else
 528                                                         dbg("parent not found in database");
 529                                                 udev_device_cleanup(udev_parent);
 530                                         }
 531                                 }
 532                         }
 533                         break;
 534                 case SUBST_TEMP_NODE:
 535                         if (udev->tmp_node[0] == '\0' && major(udev->devt) > 0) {
 536                                 dbg("create temporary device node for callout");
 537                                 snprintf(udev->tmp_node, sizeof(udev->tmp_node), "%s/.tmp-%u-%u",
 538                                          udev_root, major(udev->devt), minor(udev->devt));
 539                                 udev->tmp_node[sizeof(udev->tmp_node)-1] = '\0';
 540                                 udev_node_mknod(udev, udev->tmp_node, udev->devt, 0600, 0, 0);
 541                         }
 542                         strlcat(string, udev->tmp_node, maxsize);
 543                         dbg("substitute temporary device node name '%s'", udev->tmp_node);
 544                         break;
 545                 case SUBST_ROOT:
 546                         strlcat(string, udev_root, maxsize);
 547                         dbg("substitute udev_root '%s'", udev_root);
 548                         break;
 549                 case SUBST_ENV:
 550                         if (attr == NULL) {
 551                                 dbg("missing attribute");
 552                                 break;
 553                         }
 554                         pos = getenv(attr);
 555                         if (pos == NULL) {
 556                                 dbg("env '%s' not available", attr);
 557                                 break;
 558                         }
 559                         dbg("substitute env '%s=%s'", attr, pos);
 560                         strlcat(string, pos, maxsize);
 561                         break;
 562                 default:
 563                         err("unknown substitution type=%i", type);
 564                         break;
 565                 }
 566                 /* possibly truncate to format-char specified length */
 567                 if (len >= 0 && len < (int)strlen(head)) {
 568                         head[len] = '\0';
 569                         dbg("truncate to %i chars, subtitution string becomes '%s'", len, head);
 570                 }
 571                 strlcat(string, temp, maxsize);
 572         }
 573 }
 574
 575 static char *key_val(struct udev_rule *rule, struct key *key)
 576 {
 577         return rule->buf + key->val_off;
 578 }
 579
 580 static char *key_pair_name(struct udev_rule *rule, struct key_pair *pair)
 581 {
 582         return rule->buf + pair->key_name_off;
 583 }
 584
 585 static int match_key(const char *key_name, struct udev_rule *rule, struct key *key, const char *val)
 586 {
 587         char value[PATH_SIZE];
 588         char *key_value;
 589         char *pos;
 590         int match = 0;
 591
 592         if (key->operation != KEY_OP_MATCH &&
 593             key->operation != KEY_OP_NOMATCH)
 594                 return 0;
 595
 596         /* look for a matching string, parts are separated by '|' */
 597         strlcpy(value, rule->buf + key->val_off, sizeof(value));
 598         key_value = value;
 599         dbg("key %s value='%s'", key_name, key_value);
 600         while (key_value) {
 601                 pos = strchr(key_value, '|');
 602                 if (pos) {
 603                         pos[0] = '\0';
 604                         pos++;
 605                 }
 606
 607                 dbg("match %s '%s' <-> '%s'", key_name, key_value, val);
 608                 match = (fnmatch(key_value, val, 0) == 0);
 609                 if (match)
 610                         break;
 611
 612                 key_value = pos;
 613         }
 614
 615         if (match && (key->operation == KEY_OP_MATCH)) {
 616                 dbg("%s is true (matching value)", key_name);
 617                 return 0;
 618         }
 619         if (!match && (key->operation == KEY_OP_NOMATCH)) {
 620                 dbg("%s is true (non-matching value)", key_name);
 621                 return 0;
 622         }
 623         return -1;
 624 }
 625
 626 /* match a single rule against a given device and possibly its parent devices */
 627 static int match_rule(struct udevice *udev, struct udev_rule *rule)
 628 {
 629         int i;
 630
 631         if (match_key("ACTION", rule, &rule->action, udev->action))
 632                 goto nomatch;
 633
 634         if (match_key("KERNEL", rule, &rule->kernel, udev->dev->kernel))
 635                 goto nomatch;
 636
 637         if (match_key("SUBSYSTEM", rule, &rule->subsystem, udev->dev->subsystem))
 638                 goto nomatch;
 639
 640         if (match_key("DEVPATH", rule, &rule->devpath, udev->dev->devpath))
 641                 goto nomatch;
 642
 643         if (match_key("DRIVER", rule, &rule->driver, udev->dev->driver))
 644                 goto nomatch;
 645
 646         /* match NAME against a value assigned by an earlier rule */
 647         if (match_key("NAME", rule, &rule->name, udev->name))
 648                 goto nomatch;
 649
 650         for (i = 0; i < rule->env.count; i++) {
 651                 struct key_pair *pair = &rule->env.keys[i];
 652
 653                 /* we only check for matches, assignments will be handled later */
 654                 if (pair->key.operation == KEY_OP_MATCH ||
 655                     pair->key.operation == KEY_OP_NOMATCH) {
 656                         const char *key_name = key_pair_name(rule, pair);
 657                         const char *value = getenv(key_name);
 658
 659                         if (!value) {
 660                                 dbg("ENV{'%s'} is not set, treat as empty", key_name);
 661                                 value = "";
 662                         }
 663                         if (match_key("ENV", rule, &pair->key, value))
 664                                 goto nomatch;
 665                 }
 666         }
 667
 668         if (rule->wait_for_sysfs.operation != KEY_OP_UNSET) {
 669                 int found;
 670
 671                 found = (wait_for_sysfs(udev, key_val(rule, &rule->wait_for_sysfs), 3) == 0);
 672                 if (!found && (rule->wait_for_sysfs.operation != KEY_OP_NOMATCH))
 673                         goto nomatch;
 674         }
 675
 676         /* check for matching sysfs attribute pairs */
 677         for (i = 0; i < rule->attr.count; i++) {
 678                 struct key_pair *pair = &rule->attr.keys[i];
 679
 680                 if (pair->key.operation == KEY_OP_MATCH ||
 681                     pair->key.operation == KEY_OP_NOMATCH) {
 682                         const char *key_name = key_pair_name(rule, pair);
 683                         const char *key_value = key_val(rule, &pair->key);
 684                         const char *value;
 685                         char val[VALUE_SIZE];
 686                         size_t len;
 687
 688                         value = sysfs_attr_get_value(udev->dev->devpath, key_name);
 689                         if (value == NULL)
 690                                 goto nomatch;
 691                         strlcpy(val, value, sizeof(val));
 692
 693                         /* strip trailing whitespace of value, if not asked to match for it */
 694                         len = strlen(key_value);
 695                         if (len > 0 && !isspace(key_value[len-1])) {
 696                                 len = strlen(val);
 697                                 while (len > 0 && isspace(val[len-1]))
 698                                         val[--len] = '\0';
 699                                 dbg("removed %zi trailing whitespace chars from '%s'", strlen(val)-len, val);
 700                         }
 701
 702                         if (match_key("ATTR", rule, &pair->key, val))
 703                                 goto nomatch;
 704                 }
 705         }
 706
 707         /* walk up the chain of parent devices and find a match */
 708         udev->dev_parent = udev->dev;
 709         while (1) {
 710                 /* check for matching kernel device name */
 711                 if (match_key("KERNELS", rule, &rule->kernels, udev->dev_parent->kernel))
 712                         goto try_parent;
 713
 714                 /* check for matching subsystem value */
 715                 if (match_key("SUBSYSTEMS", rule, &rule->subsystems, udev->dev_parent->subsystem))
 716                         goto try_parent;
 717
 718                 /* check for matching driver */
 719                 if (match_key("DRIVERS", rule, &rule->drivers, udev->dev_parent->driver))
 720                         goto try_parent;
 721
 722                 /* check for matching sysfs attribute pairs */
 723                 for (i = 0; i < rule->attrs.count; i++) {
 724                         struct key_pair *pair = &rule->attrs.keys[i];
 725
 726                         if (pair->key.operation == KEY_OP_MATCH ||
 727                             pair->key.operation == KEY_OP_NOMATCH) {
 728                                 const char *key_name = key_pair_name(rule, pair);
 729                                 const char *key_value = key_val(rule, &pair->key);
 730                                 const char *value;
 731                                 char val[VALUE_SIZE];
 732                                 size_t len;
 733
 734                                 value = sysfs_attr_get_value(udev->dev_parent->devpath, key_name);
 735                                 if (value == NULL)
 736                                         value = sysfs_attr_get_value(udev->dev->devpath, key_name);
 737                                 if (value == NULL)
 738                                         goto try_parent;
 739                                 strlcpy(val, value, sizeof(val));
 740
 741                                 /* strip trailing whitespace of value, if not asked to match for it */
 742                                 len = strlen(key_value);
 743                                 if (len > 0 && !isspace(key_value[len-1])) {
 744                                         len = strlen(val);
 745                                         while (len > 0 && isspace(val[len-1]))
 746                                                 val[--len] = '\0';
 747                                         dbg("removed %zi trailing whitespace chars from '%s'", strlen(val)-len, val);
 748                                 }
 749
 750                                 if (match_key("ATTRS", rule, &pair->key, val))
 751                                         goto try_parent;
 752                         }
 753                 }
 754
 755                 /* found matching device  */
 756                 break;
 757 try_parent:
 758                 /* move to parent device */
 759                 dbg("try parent sysfs device");
 760                 udev->dev_parent = sysfs_device_get_parent(udev->dev_parent);
 761                 if (udev->dev_parent == NULL)
 762                         goto nomatch;
 763                 dbg("looking at dev_parent->devpath='%s'", udev->dev_parent->devpath);
 764                 dbg("looking at dev_parent->kernel='%s'", udev->dev_parent->kernel);
 765         }
 766
 767         /* execute external program */
 768         if (rule->program.operation != KEY_OP_UNSET) {
 769                 char program[PATH_SIZE];
 770                 char result[PATH_SIZE];
 771
 772                 strlcpy(program, key_val(rule, &rule->program), sizeof(program));
 773                 udev_rules_apply_format(udev, program, sizeof(program));
 774                 if (run_program(program, udev->dev->subsystem, result, sizeof(result), NULL, (udev_log_priority >= LOG_INFO)) != 0) {
 775                         dbg("PROGRAM is false");
 776                         udev->program_result[0] = '\0';
 777                         if (rule->program.operation != KEY_OP_NOMATCH)
 778                                 goto nomatch;
 779                 } else {
 780                         int count;
 781
 782                         dbg("PROGRAM matches");
 783                         remove_trailing_chars(result, '\n');
 784                         count = replace_untrusted_chars(result);
 785                         if (count)
 786                                 info("%i untrusted character(s) replaced" , count);
 787                         dbg("result is '%s'", result);
 788                         strlcpy(udev->program_result, result, sizeof(udev->program_result));
 789                         dbg("PROGRAM returned successful");
 790                         if (rule->program.operation == KEY_OP_NOMATCH)
 791                                 goto nomatch;
 792                 }
 793                 dbg("PROGRAM key is true");
 794         }
 795
 796         /* check for matching result of external program */
 797         if (match_key("RESULT", rule, &rule->result, udev->program_result))
 798                 goto nomatch;
 799
 800         /* import variables returned from program or or file into environment */
 801         if (rule->import.operation != KEY_OP_UNSET) {
 802                 char import[PATH_SIZE];
 803                 int rc = -1;
 804
 805                 strlcpy(import, key_val(rule, &rule->import), sizeof(import));
 806                 udev_rules_apply_format(udev, import, sizeof(import));
 807                 dbg("check for IMPORT import='%s'", import);
 808                 if (rule->import_type == IMPORT_PROGRAM) {
 809                         rc = import_program_into_env(udev, import);
 810                 } else if (rule->import_type == IMPORT_FILE) {
 811                         dbg("import file import='%s'", import);
 812                         rc = import_file_into_env(udev, import);
 813                 } else if (rule->import_type == IMPORT_PARENT) {
 814                         dbg("import parent import='%s'", import);
 815                         rc = import_parent_into_env(udev, import);
 816                 }
 817                 if (rc != 0) {
 818                         dbg("IMPORT failed");
 819                         if (rule->import.operation != KEY_OP_NOMATCH)
 820                                 goto nomatch;
 821                 } else
 822                         dbg("IMPORT '%s' imported", key_val(rule, &rule->import));
 823                 dbg("IMPORT key is true");
 824         }
 825
 826         /* rule matches, if we have ENV assignments export it */
 827         for (i = 0; i < rule->env.count; i++) {
 828                 struct key_pair *pair = &rule->env.keys[i];
 829
 830                 if (pair->key.operation == KEY_OP_ASSIGN) {
 831                         char temp_value[NAME_SIZE];
 832                         const char *key_name = key_pair_name(rule, pair);
 833                         const char *value = key_val(rule, &pair->key);
 834
 835                         /* make sure we don't write to the same string we possibly read from */
 836                         strlcpy(temp_value, value, sizeof(temp_value));
 837                         udev_rules_apply_format(udev, temp_value, NAME_SIZE);
 838
 839                         if (temp_value[0] == '\0') {
 840                                 name_list_key_remove(&udev->env_list, key_name);
 841                                 unsetenv(key_name);
 842                                 info("unset ENV '%s'", key_name);
 843                         } else {
 844                                 char *key_value = name_list_key_add(&udev->env_list, key_name, temp_value);
 845
 846                                 if (key_value == NULL)
 847                                         break;
 848                                 putenv(key_value);
 849                                 info("set ENV '%s'", key_value);
 850                         }
 851                 }
 852         }
 853
 854         /* if we have ATTR assignements write value to sysfs file */
 855         for (i = 0; i < rule->attr.count; i++) {
 856                 struct key_pair *pair = &rule->attr.keys[i];
 857
 858                 if (pair->key.operation == KEY_OP_ASSIGN) {
 859                         const char *key_name = key_pair_name(rule, pair);
 860                         char attr[PATH_SIZE];
 861                         char value[NAME_SIZE];
 862                         FILE *f;
 863
 864                         strlcpy(attr, sysfs_path, sizeof(attr));
 865                         strlcat(attr, udev->dev->devpath, sizeof(attr));
 866                         strlcat(attr, "/", sizeof(attr));
 867                         strlcat(attr, key_name, sizeof(attr));
 868                         strlcpy(value, key_val(rule, &pair->key), sizeof(value));
 869                         udev_rules_apply_format(udev, value, sizeof(value));
 870                         info("writing '%s' to sysfs file '%s'", value, attr);
 871                         f = fopen(attr, "w");
 872                         if (f != NULL) {
 873                                 if (!udev->test_run)
 874                                         if (fprintf(f, "%s", value) <= 0)
 875                                                 err("error writing ATTR{%s}: %s", attr, strerror(errno));
 876                                 fclose(f);
 877                         } else
 878                                 err("error opening ATTR{%s} for writing: %s", attr, strerror(errno));
 879                 }
 880         }
 881         return 0;
 882
 883 nomatch:
 884         return -1;
 885 }
 886
 887 int udev_rules_get_name(struct udev_rules *rules, struct udevice *udev)
 888 {
 889         struct udev_rule *rule;
 890         int name_set = 0;
 891
 892         dbg("udev->dev->devpath='%s'", udev->dev->devpath);
 893         dbg("udev->dev->kernel='%s'", udev->dev->kernel);
 894
 895         /* look for a matching rule to apply */
 896         udev_rules_iter_init(rules);
 897         while (1) {
 898                 rule = udev_rules_iter_next(rules);
 899                 if (rule == NULL)
 900                         break;
 901
 902                 if (name_set &&
 903                     (rule->name.operation == KEY_OP_ASSIGN ||
 904                      rule->name.operation == KEY_OP_ASSIGN_FINAL ||
 905                      rule->name.operation == KEY_OP_ADD)) {
 906                         dbg("node name already set, rule ignored");
 907                         continue;
 908                 }
 909
 910                 dbg("process rule");
 911                 if (match_rule(udev, rule) == 0) {
 912                         /* apply options */
 913                         if (rule->ignore_device) {
 914                                 info("rule applied, '%s' is ignored", udev->dev->kernel);
 915                                 udev->ignore_device = 1;
 916                                 return 0;
 917                         }
 918                         if (rule->ignore_remove) {
 919                                 udev->ignore_remove = 1;
 920                                 dbg("remove event should be ignored");
 921                         }
 922                         if (rule->link_priority != 0) {
 923                                 udev->link_priority = rule->link_priority;
 924                                 info("link_priority=%i", udev->link_priority);
 925                         }
 926                         /* apply all_partitions option only at a main block device */
 927                         if (rule->partitions &&
 928                             strcmp(udev->dev->subsystem, "block") == 0 && udev->dev->kernel_number[0] == '\0') {
 929                                 udev->partitions = rule->partitions;
 930                                 dbg("creation of partition nodes requested");
 931                         }
 932
 933                         /* apply permissions */
 934                         if (!udev->mode_final && rule->mode != 0000) {
 935                                 if (rule->mode_operation == KEY_OP_ASSIGN_FINAL)
 936                                         udev->mode_final = 1;
 937                                 udev->mode = rule->mode;
 938                                 dbg("applied mode=%#o to '%s'", rule->mode, udev->dev->kernel);
 939                         }
 940                         if (!udev->owner_final && rule->owner.operation != KEY_OP_UNSET) {
 941                                 if (rule->owner.operation == KEY_OP_ASSIGN_FINAL)
 942                                         udev->owner_final = 1;
 943                                 strlcpy(udev->owner, key_val(rule, &rule->owner), sizeof(udev->owner));
 944                                 udev_rules_apply_format(udev, udev->owner, sizeof(udev->owner));
 945                                 dbg("applied owner='%s' to '%s'", udev->owner, udev->dev->kernel);
 946                         }
 947                         if (!udev->group_final && rule->group.operation != KEY_OP_UNSET) {
 948                                 if (rule->group.operation == KEY_OP_ASSIGN_FINAL)
 949                                         udev->group_final = 1;
 950                                 strlcpy(udev->group, key_val(rule, &rule->group), sizeof(udev->group));
 951                                 udev_rules_apply_format(udev, udev->group, sizeof(udev->group));
 952                                 dbg("applied group='%s' to '%s'", udev->group, udev->dev->kernel);
 953                         }
 954
 955                         /* collect symlinks */
 956                         if (!udev->symlink_final && rule->symlink.operation != KEY_OP_UNSET) {
 957                                 char temp[PATH_SIZE];
 958                                 char *pos, *next;
 959                                 int count;
 960
 961                                 if (rule->symlink.operation == KEY_OP_ASSIGN_FINAL)
 962                                         udev->symlink_final = 1;
 963                                 if (rule->symlink.operation == KEY_OP_ASSIGN || rule->symlink.operation == KEY_OP_ASSIGN_FINAL) {
 964                                         info("reset symlink list");
 965                                         name_list_cleanup(&udev->symlink_list);
 966                                 }
 967                                 strlcpy(temp, key_val(rule, &rule->symlink), sizeof(temp));
 968                                 udev_rules_apply_format(udev, temp, sizeof(temp));
 969                                 count = replace_untrusted_chars(temp);
 970                                 if (count)
 971                                         info("%i untrusted character(s) replaced" , count);
 972                                 dbg("rule applied, added symlink(s) '%s'", temp);
 973
 974                                 /* add multiple symlinks separated by spaces */
 975                                 pos = temp;
 976                                 while (isspace(pos[0]))
 977                                         pos++;
 978                                 next = strchr(pos, ' ');
 979                                 while (next) {
 980                                         next[0] = '\0';
 981                                         info("add symlink '%s'", pos);
 982                                         name_list_add(&udev->symlink_list, pos, 0);
 983                                         while (isspace(next[1]))
 984                                                 next++;
 985                                         pos = &next[1];
 986                                         next = strchr(pos, ' ');
 987                                 }
 988                                 if (pos[0] != '\0') {
 989                                         info("add symlink '%s'", pos);
 990                                         name_list_add(&udev->symlink_list, pos, 0);
 991                                 }
 992                         }
 993
 994                         /* set name, later rules with name set will be ignored */
 995                         if (rule->name.operation == KEY_OP_ASSIGN ||
 996                             rule->name.operation == KEY_OP_ASSIGN_FINAL ||
 997                             rule->name.operation == KEY_OP_ADD) {
 998                                 int count;
 999
1000                                 name_set = 1;
1001                                 strlcpy(udev->name, key_val(rule, &rule->name), sizeof(udev->name));
1002                                 udev_rules_apply_format(udev, udev->name, sizeof(udev->name));
1003                                 count = replace_untrusted_chars(udev->name);
1004                                 if (count)
1005                                         info("%i untrusted character(s) replaced", count);
1006
1007                                 info("rule applied, '%s' becomes '%s'", udev->dev->kernel, udev->name);
1008                                 if (strcmp(udev->dev->subsystem, "net") != 0)
1009                                         dbg("name, '%s' is going to have owner='%s', group='%s', mode=%#o partitions=%i",
1010                                             udev->name, udev->owner, udev->group, udev->mode, udev->partitions);
1011                         }
1012
1013                         if (!udev->run_final && rule->run.operation != KEY_OP_UNSET) {
1014                                 if (rule->run.operation == KEY_OP_ASSIGN_FINAL)
1015                                         udev->run_final = 1;
1016                                 if (rule->run.operation == KEY_OP_ASSIGN || rule->run.operation == KEY_OP_ASSIGN_FINAL) {
1017                                         info("reset run list");
1018                                         name_list_cleanup(&udev->run_list);
1019                                 }
1020                                 dbg("add run '%s'", key_val(rule, &rule->run));
1021                                 name_list_add(&udev->run_list, key_val(rule, &rule->run), 0);
1022                         }
1023
1024                         if (rule->last_rule) {
1025                                 dbg("last rule to be applied");
1026                                 break;
1027                         }
1028
1029                         if (rule->goto_label.operation != KEY_OP_UNSET) {
1030                                 dbg("moving forward to label '%s'", key_val(rule, &rule->goto_label));
1031                                 udev_rules_iter_label(rules, key_val(rule, &rule->goto_label));
1032                         }
1033                 }
1034         }
1035
1036         if (!name_set) {
1037                 strlcpy(udev->name, udev->dev->kernel, sizeof(udev->name));
1038                 info("no node name set, will use kernel name '%s'", udev->name);
1039         }
1040
1041         if (udev->tmp_node[0] != '\0') {
1042                 dbg("removing temporary device node");
1043                 unlink_secure(udev->tmp_node);
1044                 udev->tmp_node[0] = '\0';
1045         }
1046
1047         return 0;
1048 }
1049
1050 int udev_rules_get_run(struct udev_rules *rules, struct udevice *udev)
1051 {
1052         struct udev_rule *rule;
1053
1054         dbg("udev->kernel='%s'", udev->dev->kernel);
1055
1056         /* look for a matching rule to apply */
1057         udev_rules_iter_init(rules);
1058         while (1) {
1059                 rule = udev_rules_iter_next(rules);
1060                 if (rule == NULL)
1061                         break;
1062
1063                 dbg("process rule");
1064                 if (rule->name.operation != KEY_OP_UNSET || rule->symlink.operation != KEY_OP_UNSET ||
1065                     rule->mode_operation != KEY_OP_UNSET || rule->owner.operation != KEY_OP_UNSET || rule->group.operation != KEY_OP_UNSET) {
1066                         dbg("skip rule that names a device");
1067                         continue;
1068                 }
1069
1070                 if (match_rule(udev, rule) == 0) {
1071                         if (rule->ignore_device) {
1072                                 info("rule applied, '%s' is ignored", udev->dev->kernel);
1073                                 udev->ignore_device = 1;
1074                                 return 0;
1075                         }
1076
1077                         if (!udev->run_final && rule->run.operation != KEY_OP_UNSET) {
1078                                 if (rule->run.operation == KEY_OP_ASSIGN || rule->run.operation == KEY_OP_ASSIGN_FINAL) {
1079                                         info("reset run list");
1080                                         name_list_cleanup(&udev->run_list);
1081                                 }
1082                                 dbg("add run '%s'", key_val(rule, &rule->run));
1083                                 name_list_add(&udev->run_list, key_val(rule, &rule->run), 0);
1084                                 if (rule->run.operation == KEY_OP_ASSIGN_FINAL)
1085                                         break;
1086                         }
1087
1088                         if (rule->last_rule) {
1089                                 dbg("last rule to be applied");
1090                                 break;
1091                         }
1092
1093                         if (rule->goto_label.operation != KEY_OP_UNSET) {
1094                                 dbg("moving forward to label '%s'", key_val(rule, &rule->goto_label));
1095                                 udev_rules_iter_label(rules, key_val(rule, &rule->goto_label));
1096                         }
1097                 }
1098         }
1099
1100         return 0;
1101 }