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 == NULL)
  83                 return -1;
  84
  85         /* skip whitespace */
  86         while (isspace(linepos[0]))
  87                 linepos++;
  88
  89         /* get the key */
  90         temp = strchr(linepos, '=');
  91         if (temp == NULL || temp == linepos)
  92                 return -1;
  93         temp[0] = '\0';
  94         *key = linepos;
  95         linepos = &temp[1];
  96
  97         /* get a quoted value */
  98         if (linepos[0] == '"' || linepos[0] == '\'') {
  99                 temp = strchr(&linepos[1], linepos[0]);
 100                 if (temp != NULL) {
 101                         temp[0] = '\0';
 102                         *value = &linepos[1];
 103                         goto out;
 104                 }
 105         }
 106
 107         /* get the value*/
 108         temp = strchr(linepos, '\n');
 109         if (temp != NULL)
 110                 temp[0] = '\0';
 111         *value = linepos;
 112 out:
 113         return 0;
 114 }
 115
 116 static int import_keys_into_env(struct udevice *udev, const char *buf, size_t bufsize)
 117 {
 118         char line[LINE_SIZE];
 119         const char *bufline;
 120         char *linepos;
 121         char *variable;
 122         char *value;
 123         size_t cur;
 124         size_t count;
 125         int lineno;
 126
 127         /* loop through the whole buffer */
 128         lineno = 0;
 129         cur = 0;
 130         while (cur < bufsize) {
 131                 count = buf_get_line(buf, bufsize, cur);
 132                 bufline = &buf[cur];
 133                 cur += count+1;
 134                 lineno++;
 135
 136                 if (count >= sizeof(line)) {
 137                         err("line too long, conf line skipped %s, line %d", udev_config_filename, lineno);
 138                         continue;
 139                 }
 140
 141                 /* eat the whitespace */
 142                 while ((count > 0) && isspace(bufline[0])) {
 143                         bufline++;
 144                         count--;
 145                 }
 146                 if (count == 0)
 147                         continue;
 148
 149                 /* see if this is a comment */
 150                 if (bufline[0] == COMMENT_CHARACTER)
 151                         continue;
 152
 153                 memcpy(line, bufline, count);
 154                 line[count] = '\0';
 155
 156                 linepos = line;
 157                 if (get_key(&linepos, &variable, &value) == 0) {
 158                         dbg("import '%s=%s'", variable, value);
 159
 160                         /* handle device, renamed by external tool, returning new path */
 161                         if (strcmp(variable, "DEVPATH") == 0) {
 162                                 info("updating devpath from '%s' to '%s'", udev->dev->devpath, value);
 163                                 sysfs_device_set_values(udev->dev, value, NULL, NULL);
 164                         } else
 165                                 name_list_key_add(&udev->env_list, variable, value);
 166                         setenv(variable, value, 1);
 167                 }
 168         }
 169
 170         return 0;
 171 }
 172
 173 static int import_file_into_env(struct udevice *udev, const char *filename)
 174 {
 175         char *buf;
 176         size_t bufsize;
 177
 178         if (file_map(filename, &buf, &bufsize) != 0) {
 179                 err("can't open '%s': %s", filename, strerror(errno));
 180                 return -1;
 181         }
 182         import_keys_into_env(udev, buf, bufsize);
 183         file_unmap(buf, bufsize);
 184
 185         return 0;
 186 }
 187
 188 static int import_program_into_env(struct udevice *udev, const char *program)
 189 {
 190         char result[2048];
 191         size_t reslen;
 192
 193         if (run_program(program, udev->dev->subsystem, result, sizeof(result), &reslen) != 0)
 194                 return -1;
 195         return import_keys_into_env(udev, result, reslen);
 196 }
 197
 198 static int import_parent_into_env(struct udevice *udev, const char *filter)
 199 {
 200         struct sysfs_device *dev_parent;
 201         int rc = -1;
 202
 203         dev_parent = sysfs_device_get_parent(udev->dev);
 204         if (dev_parent != NULL) {
 205                 struct udevice *udev_parent;
 206                 struct name_entry *name_loop;
 207
 208                 dbg("found parent '%s', get the node name", dev_parent->devpath);
 209                 udev_parent = udev_device_init(NULL);
 210                 if (udev_parent == NULL)
 211                         return -1;
 212                 /* import the udev_db of the parent */
 213                 if (udev_db_get_device(udev_parent, dev_parent->devpath) == 0) {
 214                         dbg("import stored parent env '%s'", udev_parent->name);
 215                         list_for_each_entry(name_loop, &udev_parent->env_list, node) {
 216                                 char name[NAME_SIZE];
 217                                 char *pos;
 218
 219                                 strlcpy(name, name_loop->name, sizeof(name));
 220                                 pos = strchr(name, '=');
 221                                 if (pos) {
 222                                         pos[0] = '\0';
 223                                         pos++;
 224                                         if (fnmatch(filter, name, 0) == 0) {
 225                                                 dbg("import key '%s'", name_loop->name);
 226                                                 name_list_add(&udev->env_list, name_loop->name, 0);
 227                                                 setenv(name, pos, 1);
 228                                         } else
 229                                                 dbg("skip key '%s'", name_loop->name);
 230                                 }
 231                         }
 232                         rc = 0;
 233                 } else
 234                         dbg("parent not found in database");
 235                 udev_device_cleanup(udev_parent);
 236         }
 237
 238         return rc;
 239 }
 240
 241 int udev_rules_run(struct udevice *udev)
 242 {
 243         struct name_entry *name_loop;
 244         int retval = 0;
 245
 246         dbg("executing run list");
 247         list_for_each_entry(name_loop, &udev->run_list, node) {
 248                 if (strncmp(name_loop->name, "socket:", strlen("socket:")) == 0) {
 249                         pass_env_to_socket(&name_loop->name[strlen("socket:")], udev->dev->devpath, udev->action);
 250                 } else {
 251                         char program[PATH_SIZE];
 252
 253                         strlcpy(program, name_loop->name, sizeof(program));
 254                         udev_rules_apply_format(udev, program, sizeof(program));
 255                         if (run_program(program, udev->dev->subsystem, NULL, 0, NULL) != 0)
 256                                 if (!name_loop->ignore_error)
 257                                         retval = -1;
 258                 }
 259         }
 260
 261         return retval;
 262 }
 263
 264 #define WAIT_LOOP_PER_SECOND            50
 265 static int wait_for_sysfs(struct udevice *udev, const char *file, int timeout)
 266 {
 267         char devicepath[PATH_SIZE];
 268         char filepath[PATH_SIZE];
 269         struct stat stats;
 270         int loop = timeout * WAIT_LOOP_PER_SECOND;
 271
 272         strlcpy(devicepath, sysfs_path, sizeof(devicepath));
 273         strlcat(devicepath, udev->dev->devpath, sizeof(devicepath));
 274         strlcpy(filepath, devicepath, sizeof(filepath));
 275         strlcat(filepath, "/", sizeof(filepath));
 276         strlcat(filepath, file, sizeof(filepath));
 277
 278         dbg("will wait %i sec for '%s'", timeout, filepath);
 279         while (--loop) {
 280                 /* lookup file */
 281                 if (stat(filepath, &stats) == 0) {
 282                         info("file '%s' appeared after %i loops", filepath, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
 283                         return 0;
 284                 }
 285                 /* make sure, the device did not disappear in the meantime */
 286                 if (stat(devicepath, &stats) != 0) {
 287                         info("device disappeared while waiting for '%s'", filepath);
 288                         return -2;
 289                 }
 290                 info("wait for '%s' for %i mseconds", filepath, 1000 / WAIT_LOOP_PER_SECOND);
 291                 usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
 292         }
 293         info("waiting for '%s' failed", filepath);
 294         return -1;
 295 }
 296
 297 /* handle "[$SUBSYSTEM/$KERNEL]<attribute>" lookup */
 298 static int attr_get_by_subsys_id(const char *attrstr, char *devpath, size_t len, char **attr)
 299 {
 300         char subsys[NAME_SIZE];
 301         char *attrib;
 302         char *id;
 303         int found = 0;
 304
 305         if (attrstr[0] != '[')
 306                 goto out;
 307
 308         strlcpy(subsys, &attrstr[1], sizeof(subsys));
 309
 310         attrib = strchr(subsys, ']');
 311         if (attrib == NULL)
 312                 goto out;
 313         attrib[0] = '\0';
 314         attrib = &attrib[1];
 315
 316         id = strchr(subsys, '/');
 317         if (id == NULL)
 318                 goto out;
 319         id[0] = '\0';
 320         id = &id[1];
 321
 322         if (sysfs_lookup_devpath_by_subsys_id(devpath, len, subsys, id)) {
 323                 if (attr != NULL) {
 324                         if (attrib[0] != '\0')
 325                                 *attr = attrib;
 326                         else
 327                                 *attr = NULL;
 328                 }
 329                 found = 1;
 330         }
 331 out:
 332         return found;
 333 }
 334
 335 void udev_rules_apply_format(struct udevice *udev, char *string, size_t maxsize)
 336 {
 337         char temp[PATH_SIZE];
 338         char temp2[PATH_SIZE];
 339         char *head, *tail, *pos, *cpos, *attr, *rest;
 340         int len;
 341         int i;
 342         int count;
 343         enum subst_type {
 344                 SUBST_UNKNOWN,
 345                 SUBST_DEVPATH,
 346                 SUBST_KERNEL,
 347                 SUBST_KERNEL_NUMBER,
 348                 SUBST_ID,
 349                 SUBST_MAJOR,
 350                 SUBST_MINOR,
 351                 SUBST_RESULT,
 352                 SUBST_ATTR,
 353                 SUBST_PARENT,
 354                 SUBST_TEMP_NODE,
 355                 SUBST_ROOT,
 356                 SUBST_SYS,
 357                 SUBST_ENV,
 358         };
 359         static const struct subst_map {
 360                 char *name;
 361                 char fmt;
 362                 enum subst_type type;
 363         } map[] = {
 364                 { .name = "devpath",    .fmt = 'p',     .type = SUBST_DEVPATH },
 365                 { .name = "number",     .fmt = 'n',     .type = SUBST_KERNEL_NUMBER },
 366                 { .name = "kernel",     .fmt = 'k',     .type = SUBST_KERNEL },
 367                 { .name = "id",         .fmt = 'b',     .type = SUBST_ID },
 368                 { .name = "major",      .fmt = 'M',     .type = SUBST_MAJOR },
 369                 { .name = "minor",      .fmt = 'm',     .type = SUBST_MINOR },
 370                 { .name = "result",     .fmt = 'c',     .type = SUBST_RESULT },
 371                 { .name = "attr",       .fmt = 's',     .type = SUBST_ATTR },
 372                 { .name = "sysfs",      .fmt = 's',     .type = SUBST_ATTR },
 373                 { .name = "parent",     .fmt = 'P',     .type = SUBST_PARENT },
 374                 { .name = "tempnode",   .fmt = 'N',     .type = SUBST_TEMP_NODE },
 375                 { .name = "root",       .fmt = 'r',     .type = SUBST_ROOT },
 376                 { .name = "sys",        .fmt = 'S',     .type = SUBST_SYS },
 377                 { .name = "env",        .fmt = 'E',     .type = SUBST_ENV },
 378                 { NULL, '\0', 0 }
 379         };
 380         enum subst_type type;
 381         const struct subst_map *subst;
 382
 383         head = string;
 384         while (1) {
 385                 len = -1;
 386                 while (head[0] != '\0') {
 387                         if (head[0] == '$') {
 388                                 /* substitute named variable */
 389                                 if (head[1] == '\0')
 390                                         break;
 391                                 if (head[1] == '$') {
 392                                         strlcpy(temp, head+2, sizeof(temp));
 393                                         strlcpy(head+1, temp, maxsize);
 394                                         head++;
 395                                         continue;
 396                                 }
 397                                 head[0] = '\0';
 398                                 for (subst = map; subst->name; subst++) {
 399                                         if (strncasecmp(&head[1], subst->name, strlen(subst->name)) == 0) {
 400                                                 type = subst->type;
 401                                                 tail = head + strlen(subst->name)+1;
 402                                                 dbg("will substitute format name '%s'", subst->name);
 403                                                 goto found;
 404                                         }
 405                                 }
 406                                 head[0] = '$';
 407                                 err("unknown format variable '%s'", head);
 408                         } else if (head[0] == '%') {
 409                                 /* substitute format char */
 410                                 if (head[1] == '\0')
 411                                         break;
 412                                 if (head[1] == '%') {
 413                                         strlcpy(temp, head+2, sizeof(temp));
 414                                         strlcpy(head+1, temp, maxsize);
 415                                         head++;
 416                                         continue;
 417                                 }
 418                                 head[0] = '\0';
 419                                 tail = head+1;
 420                                 len = get_format_len(&tail);
 421                                 for (subst = map; subst->name; subst++) {
 422                                         if (tail[0] == subst->fmt) {
 423                                                 type = subst->type;
 424                                                 tail++;
 425                                                 dbg("will substitute format char '%c'", subst->fmt);
 426                                                 goto found;
 427                                         }
 428                                 }
 429                                 head[0] = '%';
 430                                 err("unknown format char '%c'", tail[0]);
 431                         }
 432                         head++;
 433                 }
 434                 break;
 435 found:
 436                 attr = get_format_attribute(&tail);
 437                 strlcpy(temp, tail, sizeof(temp));
 438                 dbg("format=%i, string='%s', tail='%s'", type ,string, tail);
 439
 440                 switch (type) {
 441                 case SUBST_DEVPATH:
 442                         strlcat(string, udev->dev->devpath, maxsize);
 443                         dbg("substitute devpath '%s'", udev->dev->devpath);
 444                         break;
 445                 case SUBST_KERNEL:
 446                         strlcat(string, udev->dev->kernel, maxsize);
 447                         dbg("substitute kernel name '%s'", udev->dev->kernel);
 448                         break;
 449                 case SUBST_KERNEL_NUMBER:
 450                         strlcat(string, udev->dev->kernel_number, maxsize);
 451                         dbg("substitute kernel number '%s'", udev->dev->kernel_number);
 452                         break;
 453                 case SUBST_ID:
 454                         if (udev->dev_parent != NULL) {
 455                                 strlcat(string, udev->dev_parent->kernel, maxsize);
 456                                 dbg("substitute id '%s'", udev->dev_parent->kernel);
 457                         }
 458                         break;
 459                 case SUBST_MAJOR:
 460                         sprintf(temp2, "%d", major(udev->devt));
 461                         strlcat(string, temp2, maxsize);
 462                         dbg("substitute major number '%s'", temp2);
 463                         break;
 464                 case SUBST_MINOR:
 465                         sprintf(temp2, "%d", minor(udev->devt));
 466                         strlcat(string, temp2, maxsize);
 467                         dbg("substitute minor number '%s'", temp2);
 468                         break;
 469                 case SUBST_RESULT:
 470                         if (udev->program_result[0] == '\0')
 471                                 break;
 472                         /* get part part of the result string */
 473                         i = 0;
 474                         if (attr != NULL)
 475                                 i = strtoul(attr, &rest, 10);
 476                         if (i > 0) {
 477                                 dbg("request part #%d of result string", i);
 478                                 cpos = udev->program_result;
 479                                 while (--i) {
 480                                         while (cpos[0] != '\0' && !isspace(cpos[0]))
 481                                                 cpos++;
 482                                         while (isspace(cpos[0]))
 483                                                 cpos++;
 484                                 }
 485                                 if (i > 0) {
 486                                         err("requested part of result string not found");
 487                                         break;
 488                                 }
 489                                 strlcpy(temp2, cpos, sizeof(temp2));
 490                                 /* %{2+}c copies the whole string from the second part on */
 491                                 if (rest[0] != '+') {
 492                                         cpos = strchr(temp2, ' ');
 493                                         if (cpos)
 494                                                 cpos[0] = '\0';
 495                                 }
 496                                 strlcat(string, temp2, maxsize);
 497                                 dbg("substitute part of result string '%s'", temp2);
 498                         } else {
 499                                 strlcat(string, udev->program_result, maxsize);
 500                                 dbg("substitute result string '%s'", udev->program_result);
 501                         }
 502                         break;
 503                 case SUBST_ATTR:
 504                         if (attr == NULL)
 505                                 err("missing file parameter for attr");
 506                         else {
 507                                 char devpath[PATH_SIZE];
 508                                 char *attrib;
 509                                 const char *value = NULL;
 510                                 size_t size;
 511
 512                                 if (attr_get_by_subsys_id(attr, devpath, sizeof(devpath), &attrib)) {
 513                                         if (attrib != NULL)
 514                                                 value = sysfs_attr_get_value(devpath, attrib);
 515                                         else
 516                                                 break;
 517                                 }
 518
 519                                 /* try the current device, other matches may have selected */
 520                                 if (value == NULL && udev->dev_parent != NULL && udev->dev_parent != udev->dev)
 521                                         value = sysfs_attr_get_value(udev->dev_parent->devpath, attr);
 522
 523                                 /* look at all devices along the chain of parents */
 524                                 if (value == NULL) {
 525                                         struct sysfs_device *dev_parent = udev->dev;
 526
 527                                         do {
 528                                                 dbg("looking at '%s'", dev_parent->devpath);
 529                                                 value = sysfs_attr_get_value(dev_parent->devpath, attr);
 530                                                 if (value != NULL) {
 531                                                         strlcpy(temp2, value, sizeof(temp2));
 532                                                         break;
 533                                                 }
 534                                                 dev_parent = sysfs_device_get_parent(dev_parent);
 535                                         } while (dev_parent != NULL);
 536                                 }
 537
 538                                 if (value == NULL)
 539                                         break;
 540
 541                                 /* strip trailing whitespace, and replace unwanted characters */
 542                                 size = strlcpy(temp2, value, sizeof(temp2));
 543                                 if (size >= sizeof(temp2))
 544                                         size = sizeof(temp2)-1;
 545                                 while (size > 0 && isspace(temp2[size-1]))
 546                                         temp2[--size] = '\0';
 547                                 count = replace_chars(temp2, ALLOWED_CHARS_INPUT);
 548                                 if (count > 0)
 549                                         info("%i character(s) replaced" , count);
 550                                 strlcat(string, temp2, maxsize);
 551                                 dbg("substitute sysfs value '%s'", temp2);
 552                         }
 553                         break;
 554                 case SUBST_PARENT:
 555                         {
 556                                 struct sysfs_device *dev_parent;
 557
 558                                 dev_parent = sysfs_device_get_parent(udev->dev);
 559                                 if (dev_parent != NULL) {
 560                                         struct udevice *udev_parent;
 561
 562                                         dbg("found parent '%s', get the node name", dev_parent->devpath);
 563                                         udev_parent = udev_device_init(NULL);
 564                                         if (udev_parent != NULL) {
 565                                                 /* lookup the name in the udev_db with the DEVPATH of the parent */
 566                                                 if (udev_db_get_device(udev_parent, dev_parent->devpath) == 0) {
 567                                                         strlcat(string, udev_parent->name, maxsize);
 568                                                         dbg("substitute parent node name'%s'", udev_parent->name);
 569                                                 } else
 570                                                         dbg("parent not found in database");
 571                                                 udev_device_cleanup(udev_parent);
 572                                         }
 573                                 }
 574                         }
 575                         break;
 576                 case SUBST_TEMP_NODE:
 577                         if (udev->tmp_node[0] == '\0' && major(udev->devt) > 0) {
 578                                 dbg("create temporary device node for callout");
 579                                 snprintf(udev->tmp_node, sizeof(udev->tmp_node), "%s/.tmp-%u-%u",
 580                                          udev_root, major(udev->devt), minor(udev->devt));
 581                                 udev->tmp_node[sizeof(udev->tmp_node)-1] = '\0';
 582                                 udev_node_mknod(udev, udev->tmp_node, udev->devt, 0600, 0, 0);
 583                         }
 584                         strlcat(string, udev->tmp_node, maxsize);
 585                         dbg("substitute temporary device node name '%s'", udev->tmp_node);
 586                         break;
 587                 case SUBST_ROOT:
 588                         strlcat(string, udev_root, maxsize);
 589                         dbg("substitute udev_root '%s'", udev_root);
 590                         break;
 591                 case SUBST_SYS:
 592                         strlcat(string, sysfs_path, maxsize);
 593                         dbg("substitute sysfs_path '%s'", sysfs_path);
 594                         break;
 595                 case SUBST_ENV:
 596                         if (attr == NULL) {
 597                                 dbg("missing attribute");
 598                                 break;
 599                         }
 600                         pos = getenv(attr);
 601                         if (pos == NULL) {
 602                                 dbg("env '%s' not available", attr);
 603                                 break;
 604                         }
 605                         dbg("substitute env '%s=%s'", attr, pos);
 606                         strlcat(string, pos, maxsize);
 607                         break;
 608                 default:
 609                         err("unknown substitution type=%i", type);
 610                         break;
 611                 }
 612                 /* possibly truncate to format-char specified length */
 613                 if (len >= 0 && len < (int)strlen(head)) {
 614                         head[len] = '\0';
 615                         dbg("truncate to %i chars, subtitution string becomes '%s'", len, head);
 616                 }
 617                 strlcat(string, temp, maxsize);
 618         }
 619 }
 620
 621 static char *key_val(struct udev_rule *rule, struct key *key)
 622 {
 623         return rule->buf + key->val_off;
 624 }
 625
 626 static char *key_pair_name(struct udev_rule *rule, struct key_pair *pair)
 627 {
 628         return rule->buf + pair->key_name_off;
 629 }
 630
 631 static int match_key(const char *key_name, struct udev_rule *rule, struct key *key, const char *val)
 632 {
 633         char value[PATH_SIZE];
 634         char *key_value;
 635         char *pos;
 636         int match = 0;
 637
 638         if (key->operation != KEY_OP_MATCH &&
 639             key->operation != KEY_OP_NOMATCH)
 640                 return 0;
 641
 642         /* look for a matching string, parts are separated by '|' */
 643         strlcpy(value, rule->buf + key->val_off, sizeof(value));
 644         key_value = value;
 645         dbg("key %s value='%s'", key_name, key_value);
 646         while (key_value) {
 647                 pos = strchr(key_value, '|');
 648                 if (pos) {
 649                         pos[0] = '\0';
 650                         pos++;
 651                 }
 652
 653                 dbg("match %s '%s' <-> '%s'", key_name, key_value, val);
 654                 match = (fnmatch(key_value, val, 0) == 0);
 655                 if (match)
 656                         break;
 657
 658                 key_value = pos;
 659         }
 660
 661         if (match && (key->operation == KEY_OP_MATCH)) {
 662                 dbg("%s is true (matching value)", key_name);
 663                 return 0;
 664         }
 665         if (!match && (key->operation == KEY_OP_NOMATCH)) {
 666                 dbg("%s is true (non-matching value)", key_name);
 667                 return 0;
 668         }
 669         return -1;
 670 }
 671
 672 /* match a single rule against a given device and possibly its parent devices */
 673 static int match_rule(struct udevice *udev, struct udev_rule *rule)
 674 {
 675         int i;
 676
 677         if (match_key("ACTION", rule, &rule->action, udev->action))
 678                 goto nomatch;
 679
 680         if (match_key("KERNEL", rule, &rule->kernel, udev->dev->kernel))
 681                 goto nomatch;
 682
 683         if (match_key("SUBSYSTEM", rule, &rule->subsystem, udev->dev->subsystem))
 684                 goto nomatch;
 685
 686         if (match_key("DEVPATH", rule, &rule->devpath, udev->dev->devpath))
 687                 goto nomatch;
 688
 689         if (match_key("DRIVER", rule, &rule->driver, udev->dev->driver))
 690                 goto nomatch;
 691
 692         /* match NAME against a value assigned by an earlier rule */
 693         if (match_key("NAME", rule, &rule->name, udev->name))
 694                 goto nomatch;
 695
 696         for (i = 0; i < rule->env.count; i++) {
 697                 struct key_pair *pair = &rule->env.keys[i];
 698
 699                 /* we only check for matches, assignments will be handled later */
 700                 if (pair->key.operation == KEY_OP_MATCH ||
 701                     pair->key.operation == KEY_OP_NOMATCH) {
 702                         const char *key_name = key_pair_name(rule, pair);
 703                         const char *value = getenv(key_name);
 704
 705                         if (!value) {
 706                                 dbg("ENV{'%s'} is not set, treat as empty", key_name);
 707                                 value = "";
 708                         }
 709                         if (match_key("ENV", rule, &pair->key, value))
 710                                 goto nomatch;
 711                 }
 712         }
 713
 714         if (rule->test.operation != KEY_OP_UNSET) {
 715                 char filename[PATH_SIZE];
 716                 char devpath[PATH_SIZE];
 717                 char *attr;
 718                 struct stat statbuf;
 719                 int match;
 720
 721                 strlcpy(filename, key_val(rule, &rule->test), sizeof(filename));
 722                 udev_rules_apply_format(udev, filename, sizeof(filename));
 723
 724                 if (attr_get_by_subsys_id(filename, devpath, sizeof(devpath), &attr)) {
 725                         strlcpy(filename, sysfs_path, sizeof(filename));
 726                         strlcat(filename, devpath, sizeof(filename));
 727                         if (attr != NULL) {
 728                                 strlcat(filename, "/", sizeof(filename));
 729                                 strlcat(filename, attr, sizeof(filename));
 730                         }
 731                 }
 732
 733                 match = (stat(filename, &statbuf) == 0);
 734                 info("'%s' %s", filename, match ? "exists" : "does not exist");
 735                 if (match && rule->test_mode_mask > 0) {
 736                         match = ((statbuf.st_mode & rule->test_mode_mask) > 0);
 737                         info("'%s' has mode=%#o and %s %#o", filename, statbuf.st_mode,
 738                              match ? "matches" : "does not match",
 739                              rule->test_mode_mask);
 740                 }
 741                 if (match && rule->test.operation == KEY_OP_NOMATCH)
 742                         goto nomatch;
 743                 if (!match && rule->test.operation == KEY_OP_MATCH)
 744                         goto nomatch;
 745                 dbg("TEST key is true");
 746         }
 747
 748         if (rule->wait_for_sysfs.operation != KEY_OP_UNSET) {
 749                 int found;
 750
 751                 found = (wait_for_sysfs(udev, key_val(rule, &rule->wait_for_sysfs), 3) == 0);
 752                 if (!found && (rule->wait_for_sysfs.operation != KEY_OP_NOMATCH))
 753                         goto nomatch;
 754         }
 755
 756         /* check for matching sysfs attribute pairs */
 757         for (i = 0; i < rule->attr.count; i++) {
 758                 struct key_pair *pair = &rule->attr.keys[i];
 759
 760                 if (pair->key.operation == KEY_OP_MATCH ||
 761                     pair->key.operation == KEY_OP_NOMATCH) {
 762                         const char *key_name = key_pair_name(rule, pair);
 763                         const char *key_value = key_val(rule, &pair->key);
 764                         char devpath[PATH_SIZE];
 765                         char *attrib;
 766                         const char *value = NULL;
 767                         char val[VALUE_SIZE];
 768                         size_t len;
 769
 770                         if (attr_get_by_subsys_id(key_name, devpath, sizeof(devpath), &attrib)) {
 771                                 if (attrib != NULL)
 772                                         value = sysfs_attr_get_value(devpath, attrib);
 773                                 else
 774                                         goto nomatch;
 775                         }
 776                         if (value == NULL)
 777                                 value = sysfs_attr_get_value(udev->dev->devpath, key_name);
 778                         if (value == NULL)
 779                                 goto nomatch;
 780                         strlcpy(val, value, sizeof(val));
 781
 782                         /* strip trailing whitespace of value, if not asked to match for it */
 783                         len = strlen(key_value);
 784                         if (len > 0 && !isspace(key_value[len-1])) {
 785                                 len = strlen(val);
 786                                 while (len > 0 && isspace(val[len-1]))
 787                                         val[--len] = '\0';
 788                                 dbg("removed %zi trailing whitespace chars from '%s'", strlen(val)-len, val);
 789                         }
 790
 791                         if (match_key("ATTR", rule, &pair->key, val))
 792                                 goto nomatch;
 793                 }
 794         }
 795
 796         /* walk up the chain of parent devices and find a match */
 797         udev->dev_parent = udev->dev;
 798         while (1) {
 799                 /* check for matching kernel device name */
 800                 if (match_key("KERNELS", rule, &rule->kernels, udev->dev_parent->kernel))
 801                         goto try_parent;
 802
 803                 /* check for matching subsystem value */
 804                 if (match_key("SUBSYSTEMS", rule, &rule->subsystems, udev->dev_parent->subsystem))
 805                         goto try_parent;
 806
 807                 /* check for matching driver */
 808                 if (match_key("DRIVERS", rule, &rule->drivers, udev->dev_parent->driver))
 809                         goto try_parent;
 810
 811                 /* check for matching sysfs attribute pairs */
 812                 for (i = 0; i < rule->attrs.count; i++) {
 813                         struct key_pair *pair = &rule->attrs.keys[i];
 814
 815                         if (pair->key.operation == KEY_OP_MATCH ||
 816                             pair->key.operation == KEY_OP_NOMATCH) {
 817                                 const char *key_name = key_pair_name(rule, pair);
 818                                 const char *key_value = key_val(rule, &pair->key);
 819                                 const char *value;
 820                                 char val[VALUE_SIZE];
 821                                 size_t len;
 822
 823                                 value = sysfs_attr_get_value(udev->dev_parent->devpath, key_name);
 824                                 if (value == NULL)
 825                                         value = sysfs_attr_get_value(udev->dev->devpath, key_name);
 826                                 if (value == NULL)
 827                                         goto try_parent;
 828                                 strlcpy(val, value, sizeof(val));
 829
 830                                 /* strip trailing whitespace of value, if not asked to match for it */
 831                                 len = strlen(key_value);
 832                                 if (len > 0 && !isspace(key_value[len-1])) {
 833                                         len = strlen(val);
 834                                         while (len > 0 && isspace(val[len-1]))
 835                                                 val[--len] = '\0';
 836                                         dbg("removed %zi trailing whitespace chars from '%s'", strlen(val)-len, val);
 837                                 }
 838
 839                                 if (match_key("ATTRS", rule, &pair->key, val))
 840                                         goto try_parent;
 841                         }
 842                 }
 843
 844                 /* found matching device  */
 845                 break;
 846 try_parent:
 847                 /* move to parent device */
 848                 dbg("try parent sysfs device");
 849                 udev->dev_parent = sysfs_device_get_parent(udev->dev_parent);
 850                 if (udev->dev_parent == NULL)
 851                         goto nomatch;
 852                 dbg("looking at dev_parent->devpath='%s'", udev->dev_parent->devpath);
 853                 dbg("looking at dev_parent->kernel='%s'", udev->dev_parent->kernel);
 854         }
 855
 856         /* execute external program */
 857         if (rule->program.operation != KEY_OP_UNSET) {
 858                 char program[PATH_SIZE];
 859                 char result[PATH_SIZE];
 860
 861                 strlcpy(program, key_val(rule, &rule->program), sizeof(program));
 862                 udev_rules_apply_format(udev, program, sizeof(program));
 863                 if (run_program(program, udev->dev->subsystem, result, sizeof(result), NULL) != 0) {
 864                         dbg("PROGRAM is false");
 865                         udev->program_result[0] = '\0';
 866                         if (rule->program.operation != KEY_OP_NOMATCH)
 867                                 goto nomatch;
 868                 } else {
 869                         int count;
 870
 871                         dbg("PROGRAM matches");
 872                         remove_trailing_chars(result, '\n');
 873                         if (rule->string_escape == ESCAPE_UNSET ||
 874                             rule->string_escape == ESCAPE_REPLACE) {
 875                                 count = replace_chars(result, ALLOWED_CHARS_INPUT);
 876                                 if (count > 0)
 877                                         info("%i character(s) replaced" , count);
 878                         }
 879                         dbg("result is '%s'", result);
 880                         strlcpy(udev->program_result, result, sizeof(udev->program_result));
 881                         dbg("PROGRAM returned successful");
 882                         if (rule->program.operation == KEY_OP_NOMATCH)
 883                                 goto nomatch;
 884                 }
 885                 dbg("PROGRAM key is true");
 886         }
 887
 888         /* check for matching result of external program */
 889         if (match_key("RESULT", rule, &rule->result, udev->program_result))
 890                 goto nomatch;
 891
 892         /* import variables returned from program or or file into environment */
 893         if (rule->import.operation != KEY_OP_UNSET) {
 894                 char import[PATH_SIZE];
 895                 int rc = -1;
 896
 897                 strlcpy(import, key_val(rule, &rule->import), sizeof(import));
 898                 udev_rules_apply_format(udev, import, sizeof(import));
 899                 dbg("check for IMPORT import='%s'", import);
 900                 if (rule->import_type == IMPORT_PROGRAM) {
 901                         rc = import_program_into_env(udev, import);
 902                 } else if (rule->import_type == IMPORT_FILE) {
 903                         dbg("import file import='%s'", import);
 904                         rc = import_file_into_env(udev, import);
 905                 } else if (rule->import_type == IMPORT_PARENT) {
 906                         dbg("import parent import='%s'", import);
 907                         rc = import_parent_into_env(udev, import);
 908                 }
 909                 if (rc != 0) {
 910                         dbg("IMPORT failed");
 911                         if (rule->import.operation != KEY_OP_NOMATCH)
 912                                 goto nomatch;
 913                 } else
 914                         dbg("IMPORT '%s' imported", key_val(rule, &rule->import));
 915                 dbg("IMPORT key is true");
 916         }
 917
 918         /* rule matches, if we have ENV assignments export it */
 919         for (i = 0; i < rule->env.count; i++) {
 920                 struct key_pair *pair = &rule->env.keys[i];
 921
 922                 if (pair->key.operation == KEY_OP_ASSIGN) {
 923                         char temp_value[NAME_SIZE];
 924                         const char *key_name = key_pair_name(rule, pair);
 925                         const char *value = key_val(rule, &pair->key);
 926
 927                         /* make sure we don't write to the same string we possibly read from */
 928                         strlcpy(temp_value, value, sizeof(temp_value));
 929                         udev_rules_apply_format(udev, temp_value, NAME_SIZE);
 930
 931                         if (temp_value[0] == '\0') {
 932                                 name_list_key_remove(&udev->env_list, key_name);
 933                                 unsetenv(key_name);
 934                                 info("unset ENV '%s'", key_name);
 935                         } else {
 936                                 struct name_entry *entry;
 937
 938                                 entry = name_list_key_add(&udev->env_list, key_name, temp_value);
 939                                 if (entry == NULL)
 940                                         break;
 941                                 putenv(entry->name);
 942                                 info("set ENV '%s'", entry->name);
 943                         }
 944                 }
 945         }
 946
 947         /* if we have ATTR assignments, write value to sysfs file */
 948         for (i = 0; i < rule->attr.count; i++) {
 949                 struct key_pair *pair = &rule->attr.keys[i];
 950
 951                 if (pair->key.operation == KEY_OP_ASSIGN) {
 952                         const char *key_name = key_pair_name(rule, pair);
 953                         char devpath[PATH_SIZE];
 954                         char *attrib;
 955                         char attr[PATH_SIZE] = "";
 956                         char value[NAME_SIZE];
 957                         FILE *f;
 958
 959                         if (attr_get_by_subsys_id(key_name, devpath, sizeof(devpath), &attrib)) {
 960                                 if (attrib != NULL) {
 961                                         strlcpy(attr, sysfs_path, sizeof(attr));
 962                                         strlcat(attr, devpath, sizeof(attr));
 963                                         strlcat(attr, "/", sizeof(attr));
 964                                         strlcat(attr, attrib, sizeof(attr));
 965                                 }
 966                         }
 967
 968                         if (attr[0] == '\0') {
 969                                 strlcpy(attr, sysfs_path, sizeof(attr));
 970                                 strlcat(attr, udev->dev->devpath, sizeof(attr));
 971                                 strlcat(attr, "/", sizeof(attr));
 972                                 strlcat(attr, key_name, sizeof(attr));
 973                         }
 974
 975                         strlcpy(value, key_val(rule, &pair->key), sizeof(value));
 976                         udev_rules_apply_format(udev, value, sizeof(value));
 977                         info("writing '%s' to sysfs file '%s'", value, attr);
 978                         f = fopen(attr, "w");
 979                         if (f != NULL) {
 980                                 if (!udev->test_run)
 981                                         if (fprintf(f, "%s", value) <= 0)
 982                                                 err("error writing ATTR{%s}: %s", attr, strerror(errno));
 983                                 fclose(f);
 984                         } else
 985                                 err("error opening ATTR{%s} for writing: %s", attr, strerror(errno));
 986                 }
 987         }
 988         return 0;
 989
 990 nomatch:
 991         return -1;
 992 }
 993
 994 int udev_rules_get_name(struct udev_rules *rules, struct udevice *udev)
 995 {
 996         struct udev_rule *rule;
 997         int name_set = 0;
 998
 999         dbg("udev->dev->devpath='%s'", udev->dev->devpath);
1000         dbg("udev->dev->kernel='%s'", udev->dev->kernel);
1001
1002         /* look for a matching rule to apply */
1003         udev_rules_iter_init(rules);
1004         while (1) {
1005                 rule = udev_rules_iter_next(rules);
1006                 if (rule == NULL)
1007                         break;
1008
1009                 if (name_set &&
1010                     (rule->name.operation == KEY_OP_ASSIGN ||
1011                      rule->name.operation == KEY_OP_ASSIGN_FINAL ||
1012                      rule->name.operation == KEY_OP_ADD)) {
1013                         dbg("node name already set, rule ignored");
1014                         continue;
1015                 }
1016
1017                 dbg("process rule");
1018                 if (match_rule(udev, rule) == 0) {
1019                         /* apply options */
1020                         if (rule->ignore_device) {
1021                                 info("rule applied, '%s' is ignored", udev->dev->kernel);
1022                                 udev->ignore_device = 1;
1023                                 return 0;
1024                         }
1025                         if (rule->ignore_remove) {
1026                                 udev->ignore_remove = 1;
1027                                 dbg("remove event should be ignored");
1028                         }
1029                         if (rule->link_priority != 0) {
1030                                 udev->link_priority = rule->link_priority;
1031                                 info("link_priority=%i", udev->link_priority);
1032                         }
1033                         /* apply all_partitions option only at a main block device */
1034                         if (rule->partitions &&
1035                             strcmp(udev->dev->subsystem, "block") == 0 && udev->dev->kernel_number[0] == '\0') {
1036                                 udev->partitions = rule->partitions;
1037                                 dbg("creation of partition nodes requested");
1038                         }
1039
1040                         /* apply permissions */
1041                         if (!udev->mode_final && rule->mode != 0000) {
1042                                 if (rule->mode_operation == KEY_OP_ASSIGN_FINAL)
1043                                         udev->mode_final = 1;
1044                                 udev->mode = rule->mode;
1045                                 dbg("applied mode=%#o to '%s'", rule->mode, udev->dev->kernel);
1046                         }
1047                         if (!udev->owner_final && rule->owner.operation != KEY_OP_UNSET) {
1048                                 if (rule->owner.operation == KEY_OP_ASSIGN_FINAL)
1049                                         udev->owner_final = 1;
1050                                 strlcpy(udev->owner, key_val(rule, &rule->owner), sizeof(udev->owner));
1051                                 udev_rules_apply_format(udev, udev->owner, sizeof(udev->owner));
1052                                 dbg("applied owner='%s' to '%s'", udev->owner, udev->dev->kernel);
1053                         }
1054                         if (!udev->group_final && rule->group.operation != KEY_OP_UNSET) {
1055                                 if (rule->group.operation == KEY_OP_ASSIGN_FINAL)
1056                                         udev->group_final = 1;
1057                                 strlcpy(udev->group, key_val(rule, &rule->group), sizeof(udev->group));
1058                                 udev_rules_apply_format(udev, udev->group, sizeof(udev->group));
1059                                 dbg("applied group='%s' to '%s'", udev->group, udev->dev->kernel);
1060                         }
1061
1062                         /* collect symlinks */
1063                         if (!udev->symlink_final && rule->symlink.operation != KEY_OP_UNSET) {
1064                                 char temp[PATH_SIZE];
1065                                 char *pos, *next;
1066                                 int count;
1067
1068                                 if (rule->symlink.operation == KEY_OP_ASSIGN_FINAL)
1069                                         udev->symlink_final = 1;
1070                                 if (rule->symlink.operation == KEY_OP_ASSIGN || rule->symlink.operation == KEY_OP_ASSIGN_FINAL) {
1071                                         info("reset symlink list");
1072                                         name_list_cleanup(&udev->symlink_list);
1073                                 }
1074                                 /* allow  multiple symlinks separated by spaces */
1075                                 strlcpy(temp, key_val(rule, &rule->symlink), sizeof(temp));
1076                                 udev_rules_apply_format(udev, temp, sizeof(temp));
1077                                 if (rule->string_escape == ESCAPE_UNSET ||
1078                                     rule->string_escape == ESCAPE_REPLACE) {
1079                                         count = replace_chars(temp, ALLOWED_CHARS_FILE " ");
1080                                         if (count > 0)
1081                                                 info("%i character(s) replaced" , count);
1082                                 }
1083                                 dbg("rule applied, added symlink(s) '%s'", temp);
1084                                 pos = temp;
1085                                 while (isspace(pos[0]))
1086                                         pos++;
1087                                 next = strchr(pos, ' ');
1088                                 while (next) {
1089                                         next[0] = '\0';
1090                                         info("add symlink '%s'", pos);
1091                                         name_list_add(&udev->symlink_list, pos, 0);
1092                                         while (isspace(next[1]))
1093                                                 next++;
1094                                         pos = &next[1];
1095                                         next = strchr(pos, ' ');
1096                                 }
1097                                 if (pos[0] != '\0') {
1098                                         info("add symlink '%s'", pos);
1099                                         name_list_add(&udev->symlink_list, pos, 0);
1100                                 }
1101                         }
1102
1103                         /* set name, later rules with name set will be ignored */
1104                         if (rule->name.operation == KEY_OP_ASSIGN ||
1105                             rule->name.operation == KEY_OP_ASSIGN_FINAL ||
1106                             rule->name.operation == KEY_OP_ADD) {
1107                                 int count;
1108
1109                                 name_set = 1;
1110                                 strlcpy(udev->name, key_val(rule, &rule->name), sizeof(udev->name));
1111                                 udev_rules_apply_format(udev, udev->name, sizeof(udev->name));
1112                                 if (rule->string_escape == ESCAPE_UNSET ||
1113                                     rule->string_escape == ESCAPE_REPLACE) {
1114                                         count = replace_chars(udev->name, ALLOWED_CHARS_FILE);
1115                                         if (count > 0)
1116                                                 info("%i character(s) replaced", count);
1117                                 }
1118
1119                                 info("rule applied, '%s' becomes '%s'", udev->dev->kernel, udev->name);
1120                                 if (strcmp(udev->dev->subsystem, "net") != 0)
1121                                         dbg("name, '%s' is going to have owner='%s', group='%s', mode=%#o partitions=%i",
1122                                             udev->name, udev->owner, udev->group, udev->mode, udev->partitions);
1123                         }
1124
1125                         if (!udev->run_final && rule->run.operation != KEY_OP_UNSET) {
1126                                 struct name_entry *entry;
1127
1128                                 if (rule->run.operation == KEY_OP_ASSIGN_FINAL)
1129                                         udev->run_final = 1;
1130                                 if (rule->run.operation == KEY_OP_ASSIGN || rule->run.operation == KEY_OP_ASSIGN_FINAL) {
1131                                         info("reset run list");
1132                                         name_list_cleanup(&udev->run_list);
1133                                 }
1134                                 dbg("add run '%s'", key_val(rule, &rule->run));
1135                                 entry = name_list_add(&udev->run_list, key_val(rule, &rule->run), 0);
1136                                 if (rule->run_ignore_error)
1137                                         entry->ignore_error = 1;
1138                         }
1139
1140                         if (rule->last_rule) {
1141                                 dbg("last rule to be applied");
1142                                 break;
1143                         }
1144
1145                         if (rule->goto_label.operation != KEY_OP_UNSET) {
1146                                 dbg("moving forward to label '%s'", key_val(rule, &rule->goto_label));
1147                                 udev_rules_iter_label(rules, key_val(rule, &rule->goto_label));
1148                         }
1149                 }
1150         }
1151
1152         if (!name_set) {
1153                 strlcpy(udev->name, udev->dev->kernel, sizeof(udev->name));
1154                 info("no node name set, will use kernel name '%s'", udev->name);
1155         }
1156
1157         if (udev->tmp_node[0] != '\0') {
1158                 dbg("removing temporary device node");
1159                 unlink_secure(udev->tmp_node);
1160                 udev->tmp_node[0] = '\0';
1161         }
1162
1163         return 0;
1164 }
1165
1166 int udev_rules_get_run(struct udev_rules *rules, struct udevice *udev)
1167 {
1168         struct udev_rule *rule;
1169
1170         dbg("udev->kernel='%s'", udev->dev->kernel);
1171
1172         /* look for a matching rule to apply */
1173         udev_rules_iter_init(rules);
1174         while (1) {
1175                 rule = udev_rules_iter_next(rules);
1176                 if (rule == NULL)
1177                         break;
1178
1179                 dbg("process rule");
1180                 if (rule->name.operation != KEY_OP_UNSET || rule->symlink.operation != KEY_OP_UNSET ||
1181                     rule->mode_operation != KEY_OP_UNSET || rule->owner.operation != KEY_OP_UNSET ||
1182                     rule->group.operation != KEY_OP_UNSET) {
1183                         dbg("skip rule that names a device");
1184                         continue;
1185                 }
1186
1187                 if (match_rule(udev, rule) == 0) {
1188                         if (rule->ignore_device) {
1189                                 info("rule applied, '%s' is ignored", udev->dev->kernel);
1190                                 udev->ignore_device = 1;
1191                                 return 0;
1192                         }
1193
1194                         if (!udev->run_final && rule->run.operation != KEY_OP_UNSET) {
1195                                 struct name_entry *entry;
1196
1197                                 if (rule->run.operation == KEY_OP_ASSIGN ||
1198                                     rule->run.operation == KEY_OP_ASSIGN_FINAL) {
1199                                         info("reset run list");
1200                                         name_list_cleanup(&udev->run_list);
1201                                 }
1202                                 dbg("add run '%s'", key_val(rule, &rule->run));
1203                                 entry = name_list_add(&udev->run_list, key_val(rule, &rule->run), 0);
1204                                 if (rule->run_ignore_error)
1205                                         entry->ignore_error = 1;
1206                                 if (rule->run.operation == KEY_OP_ASSIGN_FINAL)
1207                                         break;
1208                         }
1209
1210                         if (rule->last_rule) {
1211                                 dbg("last rule to be applied");
1212                                 break;
1213                         }
1214
1215                         if (rule->goto_label.operation != KEY_OP_UNSET) {
1216                                 dbg("moving forward to label '%s'", key_val(rule, &rule->goto_label));
1217                                 udev_rules_iter_label(rules, key_val(rule, &rule->goto_label));
1218                         }
1219                 }
1220         }
1221
1222         return 0;
1223 }