udev_rules.c

   1 /*
   2  * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
   3  * Copyright (C) 2003-2006 Kay Sievers <kay.sievers@vrfy.org>
   4  *
   5  *      This program is free software; you can redistribute it and/or modify it
   6  *      under the terms of the GNU General Public License as published by the
   7  *      Free Software Foundation version 2 of the License.
   8  *
   9  *      This program is distributed in the hope that it will be useful, but
  10  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *      General Public License for more details.
  13  *
  14  *      You should have received a copy of the GNU General Public License along
  15  *      with this program; if not, write to the Free Software Foundation, Inc.,
  16  *      51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  17  *
  18  */
  19
  20 #include <stddef.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <stdio.h>
  24 #include <fcntl.h>
  25 #include <ctype.h>
  26 #include <unistd.h>
  27 #include <errno.h>
  28 #include <syslog.h>
  29 #include <fnmatch.h>
  30 #include <sys/wait.h>
  31 #include <sys/stat.h>
  32
  33 #include "udev.h"
  34 #include "udev_rules.h"
  35
  36
  37 /* extract possible {attr} and move str behind it */
  38 static char *get_format_attribute(char **str)
  39 {
  40         char *pos;
  41         char *attr = NULL;
  42
  43         if (*str[0] == '{') {
  44                 pos = strchr(*str, '}');
  45                 if (pos == NULL) {
  46                         err("missing closing brace for format");
  47                         return NULL;
  48                 }
  49                 pos[0] = '\0';
  50                 attr = *str+1;
  51                 *str = pos+1;
  52                 dbg("attribute='%s', str='%s'", attr, *str);
  53         }
  54         return attr;
  55 }
  56
  57 /* extract possible format length and move str behind it*/
  58 static int get_format_len(char **str)
  59 {
  60         int num;
  61         char *tail;
  62
  63         if (isdigit(*str[0])) {
  64                 num = (int) strtoul(*str, &tail, 10);
  65                 if (num > 0) {
  66                         *str = tail;
  67                         dbg("format length=%i", num);
  68                         return num;
  69                 } else {
  70                         err("format parsing error '%s'", *str);
  71                 }
  72         }
  73         return -1;
  74 }
  75
  76 static int get_key(char **line, char **key, char **value)
  77 {
  78         char *linepos;
  79         char *temp;
  80
  81         linepos = *line;
  82         if (!linepos)
  83                 return -1;
  84
  85         if (strchr(linepos, '\\')) {
  86                 dbg("escaped characters are not supported, skip");
  87                 return -1;
  88         }
  89
  90         /* skip whitespace */
  91         while (isspace(linepos[0]))
  92                 linepos++;
  93
  94         /* get the key */
  95         *key = linepos;
  96         while (1) {
  97                 linepos++;
  98                 if (linepos[0] == '\0')
  99                         return -1;
 100                 if (isspace(linepos[0]))
 101                         break;
 102                 if (linepos[0] == '=')
 103                         break;
 104         }
 105
 106         /* terminate key */
 107         linepos[0] = '\0';
 108         linepos++;
 109
 110         /* skip whitespace */
 111         while (isspace(linepos[0]))
 112                 linepos++;
 113
 114         /* get the value*/
 115         if (linepos[0] == '"') {
 116                 linepos++;
 117                 temp = strchr(linepos, '"');
 118                 if (!temp) {
 119                         dbg("missing closing quote");
 120                         return -1;
 121                 }
 122                 dbg("value is quoted");
 123                 temp[0] = '\0';
 124         } else if (linepos[0] == '\'') {
 125                 linepos++;
 126                 temp = strchr(linepos, '\'');
 127                 if (!temp) {
 128                         dbg("missing closing quote");
 129                         return -1;
 130                 }
 131                 dbg("value is quoted");
 132                 temp[0] = '\0';
 133         } else if (linepos[0] == '\0') {
 134                 dbg("value is empty");
 135         } else {
 136                 temp = linepos;
 137                 while (temp[0] && !isspace(temp[0]))
 138                         temp++;
 139                 temp[0] = '\0';
 140         }
 141         *value = linepos;
 142
 143         return 0;
 144 }
 145
 146 static int import_keys_into_env(struct udevice *udev, const char *buf, size_t bufsize)
 147 {
 148         char line[LINE_SIZE];
 149         const char *bufline;
 150         char *linepos;
 151         char *variable;
 152         char *value;
 153         size_t cur;
 154         size_t count;
 155         int lineno;
 156
 157         /* loop through the whole buffer */
 158         lineno = 0;
 159         cur = 0;
 160         while (cur < bufsize) {
 161                 count = buf_get_line(buf, bufsize, cur);
 162                 bufline = &buf[cur];
 163                 cur += count+1;
 164                 lineno++;
 165
 166                 if (count >= sizeof(line)) {
 167                         err("line too long, conf line skipped %s, line %d", udev_config_filename, lineno);
 168                         continue;
 169                 }
 170
 171                 /* eat the whitespace */
 172                 while ((count > 0) && isspace(bufline[0])) {
 173                         bufline++;
 174                         count--;
 175                 }
 176                 if (count == 0)
 177                         continue;
 178
 179                 /* see if this is a comment */
 180                 if (bufline[0] == COMMENT_CHARACTER)
 181                         continue;
 182
 183                 memcpy(line, bufline, count);
 184                 line[count] = '\0';
 185
 186                 linepos = line;
 187                 if (get_key(&linepos, &variable, &value) == 0) {
 188                         dbg("import '%s=%s'", variable, value);
 189                         name_list_key_add(&udev->env_list, variable, value);
 190                         setenv(variable, value, 1);
 191                 }
 192         }
 193
 194         return 0;
 195 }
 196
 197 static int import_file_into_env(struct udevice *udev, const char *filename)
 198 {
 199         char *buf;
 200         size_t bufsize;
 201
 202         if (file_map(filename, &buf, &bufsize) != 0) {
 203                 err("can't open '%s': %s", filename, strerror(errno));
 204                 return -1;
 205         }
 206         import_keys_into_env(udev, buf, bufsize);
 207         file_unmap(buf, bufsize);
 208
 209         return 0;
 210 }
 211
 212 static int import_program_into_env(struct udevice *udev, const char *program)
 213 {
 214         char result[1024];
 215         size_t reslen;
 216
 217         if (run_program(program, udev->dev->subsystem, result, sizeof(result), &reslen, (udev_log_priority >= LOG_INFO)) != 0)
 218                 return -1;
 219         return import_keys_into_env(udev, result, reslen);
 220 }
 221
 222 static int import_parent_into_env(struct udevice *udev, const char *filter)
 223 {
 224         struct sysfs_device *dev_parent;
 225         int rc = -1;
 226
 227         dev_parent = sysfs_device_get_parent(udev->dev);
 228         if (dev_parent != NULL) {
 229                 struct udevice *udev_parent;
 230                 struct name_entry *name_loop;
 231
 232                 dbg("found parent '%s', get the node name", dev_parent->devpath);
 233                 udev_parent = udev_device_init();
 234                 if (udev_parent == NULL)
 235                         return -1;
 236                 /* import the udev_db of the parent */
 237                 if (udev_db_get_device(udev_parent, dev_parent->devpath) == 0) {
 238                         dbg("import stored parent env '%s'", udev_parent->name);
 239                         list_for_each_entry(name_loop, &udev_parent->env_list, node) {
 240                                 char name[NAME_SIZE];
 241                                 char *pos;
 242
 243                                 strlcpy(name, name_loop->name, sizeof(name));
 244                                 pos = strchr(name, '=');
 245                                 if (pos) {
 246                                         pos[0] = '\0';
 247                                         pos++;
 248                                         if (fnmatch(filter, name, 0) == 0) {
 249                                                 dbg("import key '%s'", name_loop->name);
 250                                                 name_list_add(&udev->env_list, name_loop->name, 0);
 251                                                 setenv(name, pos, 1);
 252                                         } else
 253                                                 dbg("skip key '%s'", name_loop->name);
 254                                 }
 255                         }
 256                         rc = 0;
 257                 } else
 258                         dbg("parent not found in database");
 259                 udev_device_cleanup(udev_parent);
 260         }
 261
 262         return rc;
 263 }
 264
 265 #define WAIT_LOOP_PER_SECOND            50
 266 static int wait_for_sysfs(struct udevice *udev, const char *file, int timeout)
 267 {
 268         char devicepath[PATH_SIZE];
 269         char filepath[PATH_SIZE];
 270         struct stat stats;
 271         int loop = timeout * WAIT_LOOP_PER_SECOND;
 272
 273         strlcpy(devicepath, sysfs_path, sizeof(devicepath));
 274         strlcat(devicepath, udev->dev->devpath, sizeof(devicepath));
 275         strlcpy(filepath, devicepath, sizeof(filepath));
 276         strlcat(filepath, "/", sizeof(filepath));
 277         strlcat(filepath, file, sizeof(filepath));
 278
 279         dbg("will wait %i sec for '%s'", timeout, filepath);
 280         while (--loop) {
 281                 /* lookup file */
 282                 if (stat(filepath, &stats) == 0) {
 283                         info("file '%s' appeared after %i loops", filepath, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
 284                         return 0;
 285                 }
 286                 /* make sure the device does not have disappeared in the meantime */
 287                 if (stat(devicepath, &stats) != 0) {
 288                         info("device disappeared while waiting for '%s'", filepath);
 289                         return -2;
 290                 }
 291                 info("wait for '%s' for %i mseconds", filepath, 1000 / WAIT_LOOP_PER_SECOND);
 292                 usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
 293         }
 294         err("waiting for '%s' failed", filepath);
 295         return -1;
 296 }
 297
 298 void udev_rules_apply_format(struct udevice *udev, char *string, size_t maxsize)
 299 {
 300         char temp[PATH_SIZE];
 301         char temp2[PATH_SIZE];
 302         char *head, *tail, *pos, *cpos, *attr, *rest;
 303         int len;
 304         int i;
 305         int count;
 306         enum subst_type {
 307                 SUBST_UNKNOWN,
 308                 SUBST_DEVPATH,
 309                 SUBST_KERNEL,
 310                 SUBST_KERNEL_NUMBER,
 311                 SUBST_ID,
 312                 SUBST_MAJOR,
 313                 SUBST_MINOR,
 314                 SUBST_RESULT,
 315                 SUBST_ATTR,
 316                 SUBST_PARENT,
 317                 SUBST_TEMP_NODE,
 318                 SUBST_ROOT,
 319                 SUBST_ENV,
 320         };
 321         static const struct subst_map {
 322                 char *name;
 323                 char fmt;
 324                 enum subst_type type;
 325         } map[] = {
 326                 { .name = "devpath",    .fmt = 'p',     .type = SUBST_DEVPATH },
 327                 { .name = "number",     .fmt = 'n',     .type = SUBST_KERNEL_NUMBER },
 328                 { .name = "kernel",     .fmt = 'k',     .type = SUBST_KERNEL },
 329                 { .name = "id",         .fmt = 'b',     .type = SUBST_ID },
 330                 { .name = "major",      .fmt = 'M',     .type = SUBST_MAJOR },
 331                 { .name = "minor",      .fmt = 'm',     .type = SUBST_MINOR },
 332                 { .name = "result",     .fmt = 'c',     .type = SUBST_RESULT },
 333                 { .name = "attr",       .fmt = 's',     .type = SUBST_ATTR },
 334                 { .name = "sysfs",      .fmt = 's',     .type = SUBST_ATTR },
 335                 { .name = "parent",     .fmt = 'P',     .type = SUBST_PARENT },
 336                 { .name = "tempnode",   .fmt = 'N',     .type = SUBST_TEMP_NODE },
 337                 { .name = "root",       .fmt = 'r',     .type = SUBST_ROOT },
 338                 { .name = "env",        .fmt = 'E',     .type = SUBST_ENV },
 339                 { NULL, '\0', 0 }
 340         };
 341         enum subst_type type;
 342         const struct subst_map *subst;
 343
 344         head = string;
 345         while (1) {
 346                 len = -1;
 347                 while (head[0] != '\0') {
 348                         if (head[0] == '$') {
 349                                 /* substitute named variable */
 350                                 if (head[1] == '\0')
 351                                         break;
 352                                 if (head[1] == '$') {
 353                                         strlcpy(temp, head+2, sizeof(temp));
 354                                         strlcpy(head+1, temp, maxsize);
 355                                         head++;
 356                                         continue;
 357                                 }
 358                                 head[0] = '\0';
 359                                 for (subst = map; subst->name; subst++) {
 360                                         if (strncasecmp(&head[1], subst->name, strlen(subst->name)) == 0) {
 361                                                 type = subst->type;
 362                                                 tail = head + strlen(subst->name)+1;
 363                                                 dbg("will substitute format name '%s'", subst->name);
 364                                                 goto found;
 365                                         }
 366                                 }
 367                         } else if (head[0] == '%') {
 368                                 /* substitute format char */
 369                                 if (head[1] == '\0')
 370                                         break;
 371                                 if (head[1] == '%') {
 372                                         strlcpy(temp, head+2, sizeof(temp));
 373                                         strlcpy(head+1, temp, maxsize);
 374                                         head++;
 375                                         continue;
 376                                 }
 377                                 head[0] = '\0';
 378                                 tail = head+1;
 379                                 len = get_format_len(&tail);
 380                                 for (subst = map; subst->name; subst++) {
 381                                         if (tail[0] == subst->fmt) {
 382                                                 type = subst->type;
 383                                                 tail++;
 384                                                 dbg("will substitute format char '%c'", subst->fmt);
 385                                                 goto found;
 386                                         }
 387                                 }
 388                         }
 389                         head++;
 390                 }
 391                 break;
 392 found:
 393                 attr = get_format_attribute(&tail);
 394                 strlcpy(temp, tail, sizeof(temp));
 395                 dbg("format=%i, string='%s', tail='%s'", type ,string, tail);
 396
 397                 switch (type) {
 398                 case SUBST_DEVPATH:
 399                         strlcat(string, udev->dev->devpath, maxsize);
 400                         dbg("substitute devpath '%s'", udev->dev->devpath);
 401                         break;
 402                 case SUBST_KERNEL:
 403                         strlcat(string, udev->dev->kernel, maxsize);
 404                         dbg("substitute kernel name '%s'", udev->dev->kernel);
 405                         break;
 406                 case SUBST_KERNEL_NUMBER:
 407                         strlcat(string, udev->dev->kernel_number, maxsize);
 408                         dbg("substitute kernel number '%s'", udev->dev->kernel_number);
 409                         break;
 410                 case SUBST_ID:
 411                         if (udev->dev_parent != NULL) {
 412                                 strlcat(string, udev->dev_parent->kernel, maxsize);
 413                                 dbg("substitute id '%s'", udev->dev_parent->kernel);
 414                         }
 415                         break;
 416                 case SUBST_MAJOR:
 417                         sprintf(temp2, "%d", major(udev->devt));
 418                         strlcat(string, temp2, maxsize);
 419                         dbg("substitute major number '%s'", temp2);
 420                         break;
 421                 case SUBST_MINOR:
 422                         sprintf(temp2, "%d", minor(udev->devt));
 423                         strlcat(string, temp2, maxsize);
 424                         dbg("substitute minor number '%s'", temp2);
 425                         break;
 426                 case SUBST_RESULT:
 427                         if (udev->program_result[0] == '\0')
 428                                 break;
 429                         /* get part part of the result string */
 430                         i = 0;
 431                         if (attr != NULL)
 432                                 i = strtoul(attr, &rest, 10);
 433                         if (i > 0) {
 434                                 dbg("request part #%d of result string", i);
 435                                 cpos = udev->program_result;
 436                                 while (--i) {
 437                                         while (cpos[0] != '\0' && !isspace(cpos[0]))
 438                                                 cpos++;
 439                                         while (isspace(cpos[0]))
 440                                                 cpos++;
 441                                 }
 442                                 if (i > 0) {
 443                                         err("requested part of result string not found");
 444                                         break;
 445                                 }
 446                                 strlcpy(temp2, cpos, sizeof(temp2));
 447                                 /* %{2+}c copies the whole string from the second part on */
 448                                 if (rest[0] != '+') {
 449                                         cpos = strchr(temp2, ' ');
 450                                         if (cpos)
 451                                                 cpos[0] = '\0';
 452                                 }
 453                                 strlcat(string, temp2, maxsize);
 454                                 dbg("substitute part of result string '%s'", temp2);
 455                         } else {
 456                                 strlcat(string, udev->program_result, maxsize);
 457                                 dbg("substitute result string '%s'", udev->program_result);
 458                         }
 459                         break;
 460                 case SUBST_ATTR:
 461                         if (attr == NULL) {
 462                                 dbg("missing attribute");
 463                                 break;
 464                         } else {
 465                                 struct sysfs_device *dev_parent;
 466                                 const char *value;
 467
 468                                 dev_parent = udev->dev;
 469                                 do {
 470                                         dbg("looking at '%s'", dev_parent->devpath);
 471                                         value = sysfs_attr_get_value(dev_parent->devpath, attr);
 472                                         if (value != NULL) {
 473                                                 strlcpy(temp2, value, sizeof(temp2));
 474                                                 break;
 475                                         }
 476                                         dev_parent = sysfs_device_get_parent(dev_parent);
 477                                 } while (dev_parent != NULL);
 478
 479                                 /* strip trailing whitespace of sysfs value */
 480                                 i = strlen(temp2);
 481                                 while (i > 0 && isspace(temp2[i-1]))
 482                                         temp2[--i] = '\0';
 483                                 count = replace_untrusted_chars(temp2);
 484                                 if (count)
 485                                         info("%i untrusted character(s) replaced" , count);
 486                                 strlcat(string, temp2, maxsize);
 487                                 dbg("substitute sysfs value '%s'", temp2);
 488                         }
 489                         break;
 490                 case SUBST_PARENT:
 491                         {
 492                                 struct sysfs_device *dev_parent;
 493
 494                                 dev_parent = sysfs_device_get_parent(udev->dev);
 495                                 if (dev_parent != NULL) {
 496                                         struct udevice *udev_parent;
 497
 498                                         dbg("found parent '%s', get the node name", dev_parent->devpath);
 499                                         udev_parent = udev_device_init();
 500                                         if (udev_parent != NULL) {
 501                                                 /* lookup the name in the udev_db with the DEVPATH of the parent */
 502                                                 if (udev_db_get_device(udev_parent, dev_parent->devpath) == 0) {
 503                                                         strlcat(string, udev_parent->name, maxsize);
 504                                                         dbg("substitute parent node name'%s'", udev_parent->name);
 505                                                 } else
 506                                                         dbg("parent not found in database");
 507                                                 udev_device_cleanup(udev_parent);
 508                                         }
 509                                 }
 510                         }
 511                         break;
 512                 case SUBST_TEMP_NODE:
 513                         if (udev->tmp_node[0] == '\0') {
 514                                 dbg("create temporary device node for callout");
 515                                 snprintf(udev->tmp_node, sizeof(udev->tmp_node), "%s/.tmp-%u-%u",
 516                                          udev_root, major(udev->devt), minor(udev->devt));
 517                                 udev->tmp_node[sizeof(udev->tmp_node)-1] = '\0';
 518                                 udev_node_mknod(udev, udev->tmp_node, udev->devt, 0600, 0, 0);
 519                         }
 520                         strlcat(string, udev->tmp_node, maxsize);
 521                         dbg("substitute temporary device node name '%s'", udev->tmp_node);
 522                         break;
 523                 case SUBST_ROOT:
 524                         strlcat(string, udev_root, maxsize);
 525                         dbg("substitute udev_root '%s'", udev_root);
 526                         break;
 527                 case SUBST_ENV:
 528                         if (attr == NULL) {
 529                                 dbg("missing attribute");
 530                                 break;
 531                         }
 532                         pos = getenv(attr);
 533                         if (pos == NULL) {
 534                                 dbg("env '%s' not available", attr);
 535                                 break;
 536                         }
 537                         dbg("substitute env '%s=%s'", attr, pos);
 538                         strlcat(string, pos, maxsize);
 539                         break;
 540                 default:
 541                         err("unknown substitution type=%i", type);
 542                         break;
 543                 }
 544                 /* possibly truncate to format-char specified length */
 545                 if (len != -1) {
 546                         head[len] = '\0';
 547                         dbg("truncate to %i chars, subtitution string becomes '%s'", len, head);
 548                 }
 549                 strlcat(string, temp, maxsize);
 550         }
 551 }
 552
 553 static char *key_val(struct udev_rule *rule, struct key *key)
 554 {
 555         return rule->buf + key->val_off;
 556 }
 557
 558 static char *key_pair_name(struct udev_rule *rule, struct key_pair *pair)
 559 {
 560         return rule->buf + pair->key_name_off;
 561 }
 562
 563 static int match_key(const char *key_name, struct udev_rule *rule, struct key *key, const char *val)
 564 {
 565         int match;
 566         char value[PATH_SIZE];
 567         char *key_value;
 568         char *pos;
 569
 570         if (key->operation != KEY_OP_MATCH &&
 571             key->operation != KEY_OP_NOMATCH)
 572                 return 0;
 573
 574         strlcpy(value, rule->buf + key->val_off, sizeof(value));
 575         key_value = value;
 576
 577         dbg("key %s value='%s'", key_name, key_value);
 578         while (key_value) {
 579                 pos = strchr(key_value, '|');
 580                 if (pos) {
 581                         pos[0] = '\0';
 582                         pos++;
 583                 }
 584                 dbg("match %s '%s' <-> '%s'", key_name, key_value, val);
 585                 match = (fnmatch(key_value, val, 0) == 0);
 586                 if (match && (key->operation != KEY_OP_NOMATCH)) {
 587                         dbg("%s is true (matching value)", key_name);
 588                         return 0;
 589                 }
 590                 if (!match && (key->operation == KEY_OP_NOMATCH)) {
 591                         dbg("%s is true (non-matching value)", key_name);
 592                         return 0;
 593                 }
 594                 key_value = pos;
 595         }
 596         dbg("%s is false", key_name);
 597         return -1;
 598 }
 599
 600 /* match a single rule against a given device and possibly its parent devices */
 601 static int match_rule(struct udevice *udev, struct udev_rule *rule)
 602 {
 603         int i;
 604
 605         if (match_key("ACTION", rule, &rule->action, udev->action))
 606                 goto nomatch;
 607
 608         if (match_key("KERNEL", rule, &rule->kernel, udev->dev->kernel))
 609                 goto nomatch;
 610
 611         if (match_key("SUBSYSTEM", rule, &rule->subsystem, udev->dev->subsystem))
 612                 goto nomatch;
 613
 614         if (match_key("DEVPATH", rule, &rule->devpath, udev->dev->devpath))
 615                 goto nomatch;
 616
 617         if (match_key("DRIVER", rule, &rule->driver, udev->dev->driver))
 618                 goto nomatch;
 619
 620         /* match NAME against a value assigned by an earlier rule */
 621         if (match_key("NAME", rule, &rule->name, udev->name))
 622                 goto nomatch;
 623
 624         for (i = 0; i < rule->env.count; i++) {
 625                 struct key_pair *pair = &rule->env.keys[i];
 626
 627                 /* we only check for matches, assignments will be handled later */
 628                 if (pair->key.operation == KEY_OP_MATCH ||
 629                     pair->key.operation == KEY_OP_NOMATCH) {
 630                         const char *key_name = key_pair_name(rule, pair);
 631                         const char *value = getenv(key_name);
 632
 633                         if (!value) {
 634                                 dbg("ENV{'%s'} is not set, treat as empty", key_name);
 635                                 value = "";
 636                         }
 637                         if (match_key("ENV", rule, &pair->key, value))
 638                                 goto nomatch;
 639                 }
 640         }
 641
 642         if (rule->wait_for_sysfs.operation != KEY_OP_UNSET) {
 643                 int found;
 644
 645                 found = (wait_for_sysfs(udev, key_val(rule, &rule->wait_for_sysfs), 3) == 0);
 646                 if (!found && (rule->wait_for_sysfs.operation != KEY_OP_NOMATCH))
 647                         goto nomatch;
 648         }
 649
 650         /* check for matching sysfs attribute pairs */
 651         for (i = 0; i < rule->attr.count; i++) {
 652                 struct key_pair *pair = &rule->attr.keys[i];
 653
 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 *key_value = key_val(rule, &pair->key);
 658                         const char *value;
 659                         char val[VALUE_SIZE];
 660                         size_t len;
 661
 662                         value = sysfs_attr_get_value(udev->dev->devpath, key_name);
 663                         if (value == NULL)
 664                                 goto nomatch;
 665                         strlcpy(val, value, sizeof(val));
 666
 667                         /* strip trailing whitespace of value, if not asked to match for it */
 668                         len = strlen(key_value);
 669                         if (len > 0 && !isspace(key_value[len-1])) {
 670                                 len = strlen(val);
 671                                 while (len > 0 && isspace(val[len-1]))
 672                                         val[--len] = '\0';
 673                                 dbg("removed %zi trailing whitespace chars from '%s'", strlen(val)-len, val);
 674                         }
 675
 676                         if (match_key("ATTR", rule, &pair->key, val))
 677                                 goto nomatch;
 678                 }
 679         }
 680
 681         /* walk up the chain of parent devices and find a match */
 682         udev->dev_parent = udev->dev;
 683         while (1) {
 684                 /* check for matching kernel device name */
 685                 if (match_key("KERNELS", rule, &rule->kernels, udev->dev_parent->kernel))
 686                         goto try_parent;
 687
 688                 /* check for matching subsystem value */
 689                 if (match_key("SUBSYSTEMS", rule, &rule->subsystems, udev->dev_parent->subsystem))
 690                         goto try_parent;
 691
 692                 /* check for matching driver */
 693                 if (match_key("DRIVERS", rule, &rule->drivers, udev->dev_parent->driver))
 694                         goto try_parent;
 695
 696                 /* check for matching sysfs attrubute pairs */
 697                 for (i = 0; i < rule->attrs.count; i++) {
 698                         struct key_pair *pair = &rule->attrs.keys[i];
 699
 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 *key_value = key_val(rule, &pair->key);
 704                                 const char *value;
 705                                 char val[VALUE_SIZE];
 706                                 size_t len;
 707
 708                                 value = sysfs_attr_get_value(udev->dev_parent->devpath, key_name);
 709                                 if (value == NULL)
 710                                         value = sysfs_attr_get_value(udev->dev->devpath, key_name);
 711                                 if (value == NULL)
 712                                         goto try_parent;
 713                                 strlcpy(val, value, sizeof(val));
 714
 715                                 /* strip trailing whitespace of value, if not asked to match for it */
 716                                 len = strlen(key_value);
 717                                 if (len > 0 && !isspace(key_value[len-1])) {
 718                                         len = strlen(val);
 719                                         while (len > 0 && isspace(val[len-1]))
 720                                                 val[--len] = '\0';
 721                                         dbg("removed %zi trailing whitespace chars from '%s'", strlen(val)-len, val);
 722                                 }
 723
 724                                 if (match_key("ATTRS", rule, &pair->key, val))
 725                                         goto try_parent;
 726                         }
 727                 }
 728
 729                 /* found matching device  */
 730                 break;
 731 try_parent:
 732                 /* move to parent device */
 733                 dbg("try parent sysfs device");
 734                 udev->dev_parent = sysfs_device_get_parent(udev->dev_parent);
 735                 if (udev->dev_parent == NULL)
 736                         goto nomatch;
 737                 dbg("looking at dev_parent->devpath='%s'", udev->dev_parent->devpath);
 738                 dbg("looking at dev_parent->kernel='%s'", udev->dev_parent->kernel);
 739         }
 740
 741         /* execute external program */
 742         if (rule->program.operation != KEY_OP_UNSET) {
 743                 char program[PATH_SIZE];
 744                 char result[PATH_SIZE];
 745
 746                 strlcpy(program, key_val(rule, &rule->program), sizeof(program));
 747                 udev_rules_apply_format(udev, program, sizeof(program));
 748                 if (run_program(program, udev->dev->subsystem, result, sizeof(result), NULL, (udev_log_priority >= LOG_INFO)) != 0) {
 749                         dbg("PROGRAM is false");
 750                         udev->program_result[0] = '\0';
 751                         if (rule->program.operation != KEY_OP_NOMATCH)
 752                                 goto nomatch;
 753                 } else {
 754                         int count;
 755
 756                         dbg("PROGRAM matches");
 757                         remove_trailing_chars(result, '\n');
 758                         count = replace_untrusted_chars(result);
 759                         if (count)
 760                                 info("%i untrusted character(s) replaced" , count);
 761                         dbg("result is '%s'", result);
 762                         strlcpy(udev->program_result, result, sizeof(udev->program_result));
 763                         dbg("PROGRAM returned successful");
 764                         if (rule->program.operation == KEY_OP_NOMATCH)
 765                                 goto nomatch;
 766                 }
 767                 dbg("PROGRAM key is true");
 768         }
 769
 770         /* check for matching result of external program */
 771         if (match_key("RESULT", rule, &rule->result, udev->program_result))
 772                 goto nomatch;
 773
 774         /* import variables returned from program or or file into environment */
 775         if (rule->import.operation != KEY_OP_UNSET) {
 776                 char import[PATH_SIZE];
 777                 int rc = -1;
 778
 779                 strlcpy(import, key_val(rule, &rule->import), sizeof(import));
 780                 udev_rules_apply_format(udev, import, sizeof(import));
 781                 dbg("check for IMPORT import='%s'", import);
 782                 if (rule->import_type == IMPORT_PROGRAM) {
 783                         rc = import_program_into_env(udev, import);
 784                 } else if (rule->import_type == IMPORT_FILE) {
 785                         dbg("import file import='%s'", import);
 786                         rc = import_file_into_env(udev, import);
 787                 } else if (rule->import_type == IMPORT_PARENT) {
 788                         dbg("import parent import='%s'", import);
 789                         rc = import_parent_into_env(udev, import);
 790                 }
 791                 if (rc != 0) {
 792                         dbg("IMPORT failed");
 793                         if (rule->import.operation != KEY_OP_NOMATCH)
 794                                 goto nomatch;
 795                 } else
 796                         dbg("IMPORT '%s' imported", key_val(rule, &rule->import));
 797                 dbg("IMPORT key is true");
 798         }
 799
 800         /* rule matches, if we have ENV assignments export it */
 801         for (i = 0; i < rule->env.count; i++) {
 802                 struct key_pair *pair = &rule->env.keys[i];
 803
 804                 if (pair->key.operation == KEY_OP_ASSIGN) {
 805                         char temp_value[NAME_SIZE];
 806                         const char *key_name = key_pair_name(rule, pair);
 807                         const char *value = key_val(rule, &pair->key);
 808                         char *key_value;
 809
 810                         /* make sure we don't write to the same string we possibly read from */
 811                         strlcpy(temp_value, value, sizeof(temp_value));
 812                         udev_rules_apply_format(udev, temp_value, NAME_SIZE);
 813
 814                         key_value = name_list_key_add(&udev->env_list, key_name, temp_value);
 815                         if (key_value == NULL)
 816                                 break;
 817
 818                         putenv(key_value);
 819                         dbg("export ENV '%s'", key_value);
 820                 }
 821         }
 822
 823         /* if we have ATTR assignements write value to sysfs file */
 824         for (i = 0; i < rule->attr.count; i++) {
 825                 struct key_pair *pair = &rule->attr.keys[i];
 826
 827                 if (pair->key.operation == KEY_OP_ASSIGN) {
 828                         const char *key_name = key_pair_name(rule, pair);
 829                         const char *key_value = key_val(rule, &pair->key);
 830                         char attr[PATH_SIZE];
 831                         FILE *f;
 832
 833                         strlcpy(attr, sysfs_path, sizeof(attr));
 834                         strlcat(attr, udev->dev->devpath, sizeof(attr));
 835                         strlcat(attr, "/", sizeof(attr));
 836                         strlcat(attr, key_name, sizeof(attr));
 837                         dbg("write '%s' to '%s'", key_value, attr);
 838                         f = fopen(attr, "w");
 839                         if (f != NULL) {
 840                                 if (fprintf(f, "%s\n", key_value) <= 0)
 841                                         err("error writing ATTR{%s}: %s", attr, strerror(errno));
 842                                 fclose(f);
 843                         } else
 844                                 err("error opening ATTR{%s} for writing: %s", attr, strerror(errno));
 845                 }
 846         }
 847         return 0;
 848
 849 nomatch:
 850         return -1;
 851 }
 852
 853 int udev_rules_get_name(struct udev_rules *rules, struct udevice *udev)
 854 {
 855         struct udev_rule *rule;
 856         int name_set = 0;
 857
 858         dbg("udev->dev->devpath='%s'", udev->dev->devpath);
 859         dbg("udev->dev->kernel='%s'", udev->dev->kernel);
 860
 861         /* look for a matching rule to apply */
 862         udev_rules_iter_init(rules);
 863         while (1) {
 864                 rule = udev_rules_iter_next(rules);
 865                 if (rule == NULL)
 866                         break;
 867
 868                 if (name_set &&
 869                     (rule->name.operation == KEY_OP_ASSIGN ||
 870                      rule->name.operation == KEY_OP_ASSIGN_FINAL ||
 871                      rule->name.operation == KEY_OP_ADD)) {
 872                         dbg("node name already set, rule ignored");
 873                         continue;
 874                 }
 875
 876                 dbg("process rule");
 877                 if (match_rule(udev, rule) == 0) {
 878                         /* apply options */
 879                         if (rule->ignore_device) {
 880                                 info("rule applied, '%s' is ignored", udev->dev->kernel);
 881                                 udev->ignore_device = 1;
 882                                 return 0;
 883                         }
 884                         if (rule->ignore_remove) {
 885                                 udev->ignore_remove = 1;
 886                                 dbg("remove event should be ignored");
 887                         }
 888                         /* apply all_partitions option only at a main block device */
 889                         if (rule->partitions &&
 890                             strcmp(udev->dev->subsystem, "block") == 0 && udev->dev->kernel_number[0] == '\0') {
 891                                 udev->partitions = rule->partitions;
 892                                 dbg("creation of partition nodes requested");
 893                         }
 894
 895                         /* apply permissions */
 896                         if (!udev->mode_final && rule->mode != 0000) {
 897                                 if (rule->mode_operation == KEY_OP_ASSIGN_FINAL)
 898                                         udev->mode_final = 1;
 899                                 udev->mode = rule->mode;
 900                                 dbg("applied mode=%#o to '%s'", rule->mode, udev->dev->kernel);
 901                         }
 902                         if (!udev->owner_final && rule->owner.operation != KEY_OP_UNSET) {
 903                                 if (rule->owner.operation == KEY_OP_ASSIGN_FINAL)
 904                                         udev->owner_final = 1;
 905                                 strlcpy(udev->owner, key_val(rule, &rule->owner), sizeof(udev->owner));
 906                                 udev_rules_apply_format(udev, udev->owner, sizeof(udev->owner));
 907                                 dbg("applied owner='%s' to '%s'", udev->owner, udev->dev->kernel);
 908                         }
 909                         if (!udev->group_final && rule->group.operation != KEY_OP_UNSET) {
 910                                 if (rule->group.operation == KEY_OP_ASSIGN_FINAL)
 911                                         udev->group_final = 1;
 912                                 strlcpy(udev->group, key_val(rule, &rule->group), sizeof(udev->group));
 913                                 udev_rules_apply_format(udev, udev->group, sizeof(udev->group));
 914                                 dbg("applied group='%s' to '%s'", udev->group, udev->dev->kernel);
 915                         }
 916
 917                         /* collect symlinks */
 918                         if (!udev->symlink_final && rule->symlink.operation != KEY_OP_UNSET) {
 919                                 char temp[PATH_SIZE];
 920                                 char *pos, *next;
 921                                 int count;
 922
 923                                 if (rule->symlink.operation == KEY_OP_ASSIGN_FINAL)
 924                                         udev->symlink_final = 1;
 925                                 if (rule->symlink.operation == KEY_OP_ASSIGN || rule->symlink.operation == KEY_OP_ASSIGN_FINAL) {
 926                                         info("reset symlink list");
 927                                         name_list_cleanup(&udev->symlink_list);
 928                                 }
 929                                 strlcpy(temp, key_val(rule, &rule->symlink), sizeof(temp));
 930                                 udev_rules_apply_format(udev, temp, sizeof(temp));
 931                                 count = replace_untrusted_chars(temp);
 932                                 if (count)
 933                                         info("%i untrusted character(s) replaced" , count);
 934                                 dbg("rule applied, added symlink(s) '%s'", temp);
 935
 936                                 /* add multiple symlinks separated by spaces */
 937                                 pos = temp;
 938                                 while (isspace(pos[0]))
 939                                         pos++;
 940                                 next = strchr(pos, ' ');
 941                                 while (next) {
 942                                         next[0] = '\0';
 943                                         info("add symlink '%s'", pos);
 944                                         name_list_add(&udev->symlink_list, pos, 0);
 945                                         while (isspace(next[1]))
 946                                                 next++;
 947                                         pos = &next[1];
 948                                         next = strchr(pos, ' ');
 949                                 }
 950                                 if (pos[0] != '\0') {
 951                                         info("add symlink '%s'", pos);
 952                                         name_list_add(&udev->symlink_list, pos, 0);
 953                                 }
 954                         }
 955
 956                         /* set name, later rules with name set will be ignored */
 957                         if (rule->name.operation == KEY_OP_ASSIGN ||
 958                             rule->name.operation == KEY_OP_ASSIGN_FINAL ||
 959                             rule->name.operation == KEY_OP_ADD) {
 960                                 int count;
 961
 962                                 name_set = 1;
 963                                 strlcpy(udev->name, key_val(rule, &rule->name), sizeof(udev->name));
 964                                 udev_rules_apply_format(udev, udev->name, sizeof(udev->name));
 965                                 count = replace_untrusted_chars(udev->name);
 966                                 if (count)
 967                                         info("%i untrusted character(s) replaced", count);
 968
 969                                 info("rule applied, '%s' becomes '%s'", udev->dev->kernel, udev->name);
 970                                 if (strcmp(udev->dev->subsystem, "net") != 0)
 971                                         dbg("name, '%s' is going to have owner='%s', group='%s', mode=%#o partitions=%i",
 972                                             udev->name, udev->owner, udev->group, udev->mode, udev->partitions);
 973                         }
 974
 975                         if (!udev->run_final && rule->run.operation != KEY_OP_UNSET) {
 976                                 if (rule->run.operation == KEY_OP_ASSIGN_FINAL)
 977                                         udev->run_final = 1;
 978                                 if (rule->run.operation == KEY_OP_ASSIGN || rule->run.operation == KEY_OP_ASSIGN_FINAL) {
 979                                         info("reset run list");
 980                                         name_list_cleanup(&udev->run_list);
 981                                 }
 982                                 dbg("add run '%s'", key_val(rule, &rule->run));
 983                                 name_list_add(&udev->run_list, key_val(rule, &rule->run), 0);
 984                         }
 985
 986                         if (rule->last_rule) {
 987                                 dbg("last rule to be applied");
 988                                 break;
 989                         }
 990
 991                         if (rule->goto_label.operation != KEY_OP_UNSET) {
 992                                 dbg("moving forward to label '%s'", key_val(rule, &rule->goto_label));
 993                                 udev_rules_iter_label(rules, key_val(rule, &rule->goto_label));
 994                         }
 995                 }
 996         }
 997
 998         if (!name_set) {
 999                 strlcpy(udev->name, udev->dev->kernel, sizeof(udev->name));
1000                 info("no node name set, will use kernel name '%s'", udev->name);
1001         }
1002
1003         if (udev->tmp_node[0] != '\0') {
1004                 dbg("removing temporary device node");
1005                 unlink_secure(udev->tmp_node);
1006                 udev->tmp_node[0] = '\0';
1007         }
1008
1009         return 0;
1010 }
1011
1012 int udev_rules_get_run(struct udev_rules *rules, struct udevice *udev)
1013 {
1014         struct udev_rule *rule;
1015
1016         dbg("udev->kernel='%s'", udev->dev->kernel);
1017
1018         /* look for a matching rule to apply */
1019         udev_rules_iter_init(rules);
1020         while (1) {
1021                 rule = udev_rules_iter_next(rules);
1022                 if (rule == NULL)
1023                         break;
1024
1025                 dbg("process rule");
1026                 if (rule->name.operation != KEY_OP_UNSET || rule->symlink.operation != KEY_OP_UNSET ||
1027                     rule->mode_operation != KEY_OP_UNSET || rule->owner.operation != KEY_OP_UNSET || rule->group.operation != KEY_OP_UNSET) {
1028                         dbg("skip rule that names a device");
1029                         continue;
1030                 }
1031
1032                 if (match_rule(udev, rule) == 0) {
1033                         if (rule->ignore_device) {
1034                                 info("rule applied, '%s' is ignored", udev->dev->kernel);
1035                                 udev->ignore_device = 1;
1036                                 return 0;
1037                         }
1038
1039                         if (!udev->run_final && rule->run.operation != KEY_OP_UNSET) {
1040                                 if (rule->run.operation == KEY_OP_ASSIGN || rule->run.operation == KEY_OP_ASSIGN_FINAL) {
1041                                         info("reset run list");
1042                                         name_list_cleanup(&udev->run_list);
1043                                 }
1044                                 dbg("add run '%s'", key_val(rule, &rule->run));
1045                                 name_list_add(&udev->run_list, key_val(rule, &rule->run), 0);
1046                                 if (rule->run.operation == KEY_OP_ASSIGN_FINAL)
1047                                         break;
1048                         }
1049
1050                         if (rule->last_rule) {
1051                                 dbg("last rule to be applied");
1052                                 break;
1053                         }
1054
1055                         if (rule->goto_label.operation != KEY_OP_UNSET) {
1056                                 dbg("moving forward to label '%s'", key_val(rule, &rule->goto_label));
1057                                 udev_rules_iter_label(rules, key_val(rule, &rule->goto_label));
1058                         }
1059                 }
1060         }
1061
1062         return 0;
1063 }