udev_rules.c

   1 /*
   2  * udev_rules.c
   3  *
   4  * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
   5  * Copyright (C) 2003-2006 Kay Sievers <kay.sievers@vrfy.org>
   6  *
   7  *      This program is free software; you can redistribute it and/or modify it
   8  *      under the terms of the GNU General Public License as published by the
   9  *      Free Software Foundation version 2 of the License.
  10  *
  11  *      This program is distributed in the hope that it will be useful, but
  12  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  *      General Public License for more details.
  15  *
  16  *      You should have received a copy of the GNU General Public License along
  17  *      with this program; if not, write to the Free Software Foundation, Inc.,
  18  *      675 Mass Ave, Cambridge, MA 02139, USA.
  19  *
  20  */
  21
  22 #include <stddef.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <stdio.h>
  26 #include <fcntl.h>
  27 #include <ctype.h>
  28 #include <unistd.h>
  29 #include <errno.h>
  30 #include <syslog.h>
  31 #include <fnmatch.h>
  32 #include <sys/wait.h>
  33 #include <sys/stat.h>
  34
  35 #include "udev.h"
  36 #include "udev_rules.h"
  37
  38
  39 /* extract possible {attr} and move str behind it */
  40 static char *get_format_attribute(char **str)
  41 {
  42         char *pos;
  43         char *attr = NULL;
  44
  45         if (*str[0] == '{') {
  46                 pos = strchr(*str, '}');
  47                 if (pos == NULL) {
  48                         err("missing closing brace for format");
  49                         return NULL;
  50                 }
  51                 pos[0] = '\0';
  52                 attr = *str+1;
  53                 *str = pos+1;
  54                 dbg("attribute='%s', str='%s'", attr, *str);
  55         }
  56         return attr;
  57 }
  58
  59 /* extract possible format length and move str behind it*/
  60 static int get_format_len(char **str)
  61 {
  62         int num;
  63         char *tail;
  64
  65         if (isdigit(*str[0])) {
  66                 num = (int) strtoul(*str, &tail, 10);
  67                 if (num > 0) {
  68                         *str = tail;
  69                         dbg("format length=%i", num);
  70                         return num;
  71                 } else {
  72                         err("format parsing error '%s'", *str);
  73                 }
  74         }
  75         return -1;
  76 }
  77
  78 static int get_key(char **line, char **key, char **value)
  79 {
  80         char *linepos;
  81         char *temp;
  82
  83         linepos = *line;
  84         if (!linepos)
  85                 return -1;
  86
  87         if (strchr(linepos, '\\')) {
  88                 dbg("escaped characters are not supported, skip");
  89                 return -1;
  90         }
  91
  92         /* skip whitespace */
  93         while (isspace(linepos[0]))
  94                 linepos++;
  95
  96         /* get the key */
  97         *key = linepos;
  98         while (1) {
  99                 linepos++;
 100                 if (linepos[0] == '\0')
 101                         return -1;
 102                 if (isspace(linepos[0]))
 103                         break;
 104                 if (linepos[0] == '=')
 105                         break;
 106         }
 107
 108         /* terminate key */
 109         linepos[0] = '\0';
 110         linepos++;
 111
 112         /* skip whitespace */
 113         while (isspace(linepos[0]))
 114                 linepos++;
 115
 116         /* get the value*/
 117         if (linepos[0] == '"') {
 118                 linepos++;
 119                 temp = strchr(linepos, '"');
 120                 if (!temp) {
 121                         dbg("missing closing quote");
 122                         return -1;
 123                 }
 124                 dbg("value is quoted");
 125                 temp[0] = '\0';
 126         } else if (linepos[0] == '\'') {
 127                 linepos++;
 128                 temp = strchr(linepos, '\'');
 129                 if (!temp) {
 130                         dbg("missing closing quote");
 131                         return -1;
 132                 }
 133                 dbg("value is quoted");
 134                 temp[0] = '\0';
 135         } else if (linepos[0] == '\0') {
 136                 dbg("value is empty");
 137         } else {
 138                 temp = linepos;
 139                 while (temp[0] && !isspace(temp[0]))
 140                         temp++;
 141                 temp[0] = '\0';
 142         }
 143         *value = linepos;
 144
 145         return 0;
 146 }
 147
 148 static int import_keys_into_env(struct udevice *udev, const char *buf, size_t bufsize)
 149 {
 150         char line[LINE_SIZE];
 151         const char *bufline;
 152         char *linepos;
 153         char *variable;
 154         char *value;
 155         size_t cur;
 156         size_t count;
 157         int lineno;
 158
 159         /* loop through the whole buffer */
 160         lineno = 0;
 161         cur = 0;
 162         while (cur < bufsize) {
 163                 count = buf_get_line(buf, bufsize, cur);
 164                 bufline = &buf[cur];
 165                 cur += count+1;
 166                 lineno++;
 167
 168                 if (count >= sizeof(line)) {
 169                         err("line too long, conf line skipped %s, line %d", udev_config_filename, lineno);
 170                         continue;
 171                 }
 172
 173                 /* eat the whitespace */
 174                 while ((count > 0) && isspace(bufline[0])) {
 175                         bufline++;
 176                         count--;
 177                 }
 178                 if (count == 0)
 179                         continue;
 180
 181                 /* see if this is a comment */
 182                 if (bufline[0] == COMMENT_CHARACTER)
 183                         continue;
 184
 185                 memcpy(line, bufline, count);
 186                 line[count] = '\0';
 187
 188                 linepos = line;
 189                 if (get_key(&linepos, &variable, &value) == 0) {
 190                         dbg("import '%s=%s'", variable, value);
 191                         name_list_key_add(&udev->env_list, variable, value);
 192                         setenv(variable, value, 1);
 193                 }
 194         }
 195
 196         return 0;
 197 }
 198
 199 static int import_file_into_env(struct udevice *udev, const char *filename)
 200 {
 201         char *buf;
 202         size_t bufsize;
 203
 204         if (file_map(filename, &buf, &bufsize) != 0) {
 205                 err("can't open '%s': %s", filename, strerror(errno));
 206                 return -1;
 207         }
 208         import_keys_into_env(udev, buf, bufsize);
 209         file_unmap(buf, bufsize);
 210
 211         return 0;
 212 }
 213
 214 static int import_program_into_env(struct udevice *udev, const char *program)
 215 {
 216         char result[1024];
 217         size_t reslen;
 218
 219         if (run_program(program, udev->dev->subsystem, result, sizeof(result), &reslen, (udev_log_priority >= LOG_INFO)) != 0)
 220                 return -1;
 221         return import_keys_into_env(udev, result, reslen);
 222 }
 223
 224 static int import_parent_into_env(struct udevice *udev, const char *filter)
 225 {
 226         struct sysfs_device *dev_parent;
 227         int rc = -1;
 228
 229         dev_parent = sysfs_device_get_parent(udev->dev);
 230         if (dev_parent != NULL) {
 231                 struct udevice *udev_parent;
 232                 struct name_entry *name_loop;
 233
 234                 dbg("found parent '%s', get the node name", dev_parent->devpath);
 235                 udev_parent = udev_device_init();
 236                 if (udev_parent == NULL)
 237                         return -1;
 238                 /* import the udev_db of the parent */
 239                 if (udev_db_get_device(udev_parent, dev_parent->devpath) == 0) {
 240                         dbg("import stored parent env '%s'", udev_parent->name);
 241                         list_for_each_entry(name_loop, &udev_parent->env_list, node) {
 242                                 char name[NAME_SIZE];
 243                                 char *pos;
 244
 245                                 strlcpy(name, name_loop->name, sizeof(name));
 246                                 pos = strchr(name, '=');
 247                                 if (pos) {
 248                                         pos[0] = '\0';
 249                                         pos++;
 250                                         if (fnmatch(filter, name, 0) == 0) {
 251                                                 dbg("import key '%s'", name_loop->name);
 252                                                 name_list_add(&udev->env_list, name_loop->name, 0);
 253                                                 setenv(name, pos, 1);
 254                                         } else
 255                                                 dbg("skip key '%s'", name_loop->name);
 256                                 }
 257                         }
 258                         rc = 0;
 259                 } else
 260                         dbg("parent not found in database");
 261                 udev_device_cleanup(udev_parent);
 262         }
 263
 264         return rc;
 265 }
 266
 267 #define WAIT_LOOP_PER_SECOND            50
 268 static int wait_for_sysfs(struct udevice *udev, const char *file, int timeout)
 269 {
 270         char devicepath[PATH_SIZE];
 271         char filepath[PATH_SIZE];
 272         struct stat stats;
 273         int loop = timeout * WAIT_LOOP_PER_SECOND;
 274
 275         strlcpy(devicepath, sysfs_path, sizeof(devicepath));
 276         strlcat(devicepath, udev->dev->devpath, sizeof(devicepath));
 277         strlcpy(filepath, devicepath, sizeof(filepath));
 278         strlcat(filepath, "/", sizeof(filepath));
 279         strlcat(filepath, file, sizeof(filepath));
 280
 281         dbg("will wait %i sec for '%s'", timeout, filepath);
 282         while (--loop) {
 283                 /* lookup file */
 284                 if (stat(filepath, &stats) == 0) {
 285                         info("file '%s' appeared after %i loops", filepath, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
 286                         return 0;
 287                 }
 288                 /* make sure the device does not have disappeared in the meantime */
 289                 if (stat(devicepath, &stats) != 0) {
 290                         info("device disappeared while waiting for '%s'", filepath);
 291                         return -2;
 292                 }
 293                 info("wait for '%s' for %i mseconds", filepath, 1000 / WAIT_LOOP_PER_SECOND);
 294                 usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
 295         }
 296         err("waiting for '%s' failed", filepath);
 297         return -1;
 298 }
 299
 300 void udev_rules_apply_format(struct udevice *udev, char *string, size_t maxsize)
 301 {
 302         char temp[PATH_SIZE];
 303         char temp2[PATH_SIZE];
 304         char *head, *tail, *pos, *cpos, *attr, *rest;
 305         int len;
 306         int i;
 307         int count;
 308         enum subst_type {
 309                 SUBST_UNKNOWN,
 310                 SUBST_DEVPATH,
 311                 SUBST_KERNEL,
 312                 SUBST_KERNEL_NUMBER,
 313                 SUBST_ID,
 314                 SUBST_MAJOR,
 315                 SUBST_MINOR,
 316                 SUBST_RESULT,
 317                 SUBST_ATTR,
 318                 SUBST_PARENT,
 319                 SUBST_TEMP_NODE,
 320                 SUBST_ROOT,
 321                 SUBST_ENV,
 322         };
 323         static const struct subst_map {
 324                 char *name;
 325                 char fmt;
 326                 enum subst_type type;
 327         } map[] = {
 328                 { .name = "devpath",    .fmt = 'p',     .type = SUBST_DEVPATH },
 329                 { .name = "number",     .fmt = 'n',     .type = SUBST_KERNEL_NUMBER },
 330                 { .name = "kernel",     .fmt = 'k',     .type = SUBST_KERNEL },
 331                 { .name = "id",         .fmt = 'b',     .type = SUBST_ID },
 332                 { .name = "major",      .fmt = 'M',     .type = SUBST_MAJOR },
 333                 { .name = "minor",      .fmt = 'm',     .type = SUBST_MINOR },
 334                 { .name = "result",     .fmt = 'c',     .type = SUBST_RESULT },
 335                 { .name = "attr",       .fmt = 's',     .type = SUBST_ATTR },
 336                 { .name = "sysfs",      .fmt = 's',     .type = SUBST_ATTR },
 337                 { .name = "parent",     .fmt = 'P',     .type = SUBST_PARENT },
 338                 { .name = "tempnode",   .fmt = 'N',     .type = SUBST_TEMP_NODE },
 339                 { .name = "root",       .fmt = 'r',     .type = SUBST_ROOT },
 340                 { .name = "env",        .fmt = 'E',     .type = SUBST_ENV },
 341                 { NULL, '\0', 0 }
 342         };
 343         enum subst_type type;
 344         const struct subst_map *subst;
 345
 346         head = string;
 347         while (1) {
 348                 len = -1;
 349                 while (head[0] != '\0') {
 350                         if (head[0] == '$') {
 351                                 /* substitute named variable */
 352                                 if (head[1] == '\0')
 353                                         break;
 354                                 if (head[1] == '$') {
 355                                         strlcpy(temp, head+2, sizeof(temp));
 356                                         strlcpy(head+1, temp, maxsize);
 357                                         head++;
 358                                         continue;
 359                                 }
 360                                 head[0] = '\0';
 361                                 for (subst = map; subst->name; subst++) {
 362                                         if (strncasecmp(&head[1], subst->name, strlen(subst->name)) == 0) {
 363                                                 type = subst->type;
 364                                                 tail = head + strlen(subst->name)+1;
 365                                                 dbg("will substitute format name '%s'", subst->name);
 366                                                 goto found;
 367                                         }
 368                                 }
 369                         } else if (head[0] == '%') {
 370                                 /* substitute format char */
 371                                 if (head[1] == '\0')
 372                                         break;
 373                                 if (head[1] == '%') {
 374                                         strlcpy(temp, head+2, sizeof(temp));
 375                                         strlcpy(head+1, temp, maxsize);
 376                                         head++;
 377                                         continue;
 378                                 }
 379                                 head[0] = '\0';
 380                                 tail = head+1;
 381                                 len = get_format_len(&tail);
 382                                 for (subst = map; subst->name; subst++) {
 383                                         if (tail[0] == subst->fmt) {
 384                                                 type = subst->type;
 385                                                 tail++;
 386                                                 dbg("will substitute format char '%c'", subst->fmt);
 387                                                 goto found;
 388                                         }
 389                                 }
 390                         }
 391                         head++;
 392                 }
 393                 break;
 394 found:
 395                 attr = get_format_attribute(&tail);
 396                 strlcpy(temp, tail, sizeof(temp));
 397                 dbg("format=%i, string='%s', tail='%s'", type ,string, tail);
 398
 399                 switch (type) {
 400                 case SUBST_DEVPATH:
 401                         strlcat(string, udev->dev->devpath, maxsize);
 402                         dbg("substitute devpath '%s'", udev->dev->devpath);
 403                         break;
 404                 case SUBST_KERNEL:
 405                         strlcat(string, udev->dev->kernel, maxsize);
 406                         dbg("substitute kernel name '%s'", udev->dev->kernel);
 407                         break;
 408                 case SUBST_KERNEL_NUMBER:
 409                         strlcat(string, udev->dev->kernel_number, maxsize);
 410                         dbg("substitute kernel number '%s'", udev->dev->kernel_number);
 411                         break;
 412                 case SUBST_ID:
 413                         if (udev->dev_parent != NULL) {
 414                                 strlcat(string, udev->dev_parent->kernel, maxsize);
 415                                 dbg("substitute id '%s'", udev->dev_parent->kernel);
 416                         }
 417                         break;
 418                 case SUBST_MAJOR:
 419                         sprintf(temp2, "%d", major(udev->devt));
 420                         strlcat(string, temp2, maxsize);
 421                         dbg("substitute major number '%s'", temp2);
 422                         break;
 423                 case SUBST_MINOR:
 424                         sprintf(temp2, "%d", minor(udev->devt));
 425                         strlcat(string, temp2, maxsize);
 426                         dbg("substitute minor number '%s'", temp2);
 427                         break;
 428                 case SUBST_RESULT:
 429                         if (udev->program_result[0] == '\0')
 430                                 break;
 431                         /* get part part of the result string */
 432                         i = 0;
 433                         if (attr != NULL)
 434                                 i = strtoul(attr, &rest, 10);
 435                         if (i > 0) {
 436                                 dbg("request part #%d of result string", i);
 437                                 cpos = udev->program_result;
 438                                 while (--i) {
 439                                         while (cpos[0] != '\0' && !isspace(cpos[0]))
 440                                                 cpos++;
 441                                         while (isspace(cpos[0]))
 442                                                 cpos++;
 443                                 }
 444                                 if (i > 0) {
 445                                         err("requested part of result string not found");
 446                                         break;
 447                                 }
 448                                 strlcpy(temp2, cpos, sizeof(temp2));
 449                                 /* %{2+}c copies the whole string from the second part on */
 450                                 if (rest[0] != '+') {
 451                                         cpos = strchr(temp2, ' ');
 452                                         if (cpos)
 453                                                 cpos[0] = '\0';
 454                                 }
 455                                 strlcat(string, temp2, maxsize);
 456                                 dbg("substitute part of result string '%s'", temp2);
 457                         } else {
 458                                 strlcat(string, udev->program_result, maxsize);
 459                                 dbg("substitute result string '%s'", udev->program_result);
 460                         }
 461                         break;
 462                 case SUBST_ATTR:
 463                         if (attr == NULL) {
 464                                 dbg("missing attribute");
 465                                 break;
 466                         } else {
 467                                 struct sysfs_device *dev_parent;
 468                                 const char *value;
 469
 470                                 dev_parent = udev->dev;
 471                                 do {
 472                                         dbg("looking at '%s'", dev_parent->devpath);
 473                                         value = sysfs_attr_get_value(dev_parent->devpath, attr);
 474                                         if (value != NULL) {
 475                                                 strlcpy(temp2, value, sizeof(temp2));
 476                                                 break;
 477                                         }
 478                                         dev_parent = sysfs_device_get_parent(dev_parent);
 479                                 } while (dev_parent != NULL);
 480
 481                                 /* strip trailing whitespace of sysfs value */
 482                                 i = strlen(temp2);
 483                                 while (i > 0 && isspace(temp2[i-1]))
 484                                         temp2[--i] = '\0';
 485                                 count = replace_untrusted_chars(temp2);
 486                                 if (count)
 487                                         info("%i untrusted character(s) replaced" , count);
 488                                 strlcat(string, temp2, maxsize);
 489                                 dbg("substitute sysfs value '%s'", temp2);
 490                         }
 491                         break;
 492                 case SUBST_PARENT:
 493                         {
 494                                 struct sysfs_device *dev_parent;
 495
 496                                 dev_parent = sysfs_device_get_parent(udev->dev);
 497                                 if (dev_parent != NULL) {
 498                                         struct udevice *udev_parent;
 499
 500                                         dbg("found parent '%s', get the node name", dev_parent->devpath);
 501                                         udev_parent = udev_device_init();
 502                                         if (udev_parent != NULL) {
 503                                                 /* lookup the name in the udev_db with the DEVPATH of the parent */
 504                                                 if (udev_db_get_device(udev_parent, dev_parent->devpath) == 0) {
 505                                                         strlcat(string, udev_parent->name, maxsize);
 506                                                         dbg("substitute parent node name'%s'", udev_parent->name);
 507                                                 } else
 508                                                         dbg("parent not found in database");
 509                                                 udev_device_cleanup(udev_parent);
 510                                         }
 511                                 }
 512                         }
 513                         break;
 514                 case SUBST_TEMP_NODE:
 515                         if (udev->tmp_node[0] == '\0') {
 516                                 dbg("create temporary device node for callout");
 517                                 snprintf(udev->tmp_node, sizeof(udev->tmp_node), "%s/.tmp-%u-%u",
 518                                          udev_root, major(udev->devt), minor(udev->devt));
 519                                 udev->tmp_node[sizeof(udev->tmp_node)-1] = '\0';
 520                                 udev_node_mknod(udev, udev->tmp_node, udev->devt, 0600, 0, 0);
 521                         }
 522                         strlcat(string, udev->tmp_node, maxsize);
 523                         dbg("substitute temporary device node name '%s'", udev->tmp_node);
 524                         break;
 525                 case SUBST_ROOT:
 526                         strlcat(string, udev_root, maxsize);
 527                         dbg("substitute udev_root '%s'", udev_root);
 528                         break;
 529                 case SUBST_ENV:
 530                         if (attr == NULL) {
 531                                 dbg("missing attribute");
 532                                 break;
 533                         }
 534                         pos = getenv(attr);
 535                         if (pos == NULL) {
 536                                 dbg("env '%s' not available", attr);
 537                                 break;
 538                         }
 539                         dbg("substitute env '%s=%s'", attr, pos);
 540                         strlcat(string, pos, maxsize);
 541                         break;
 542                 default:
 543                         err("unknown substitution type=%i", type);
 544                         break;
 545                 }
 546                 /* possibly truncate to format-char specified length */
 547                 if (len != -1) {
 548                         head[len] = '\0';
 549                         dbg("truncate to %i chars, subtitution string becomes '%s'", len, head);
 550                 }
 551                 strlcat(string, temp, maxsize);
 552         }
 553 }
 554
 555 static char *key_val(struct udev_rule *rule, struct key *key)
 556 {
 557         return rule->buf + key->val_off;
 558 }
 559
 560 static char *key_pair_name(struct udev_rule *rule, struct key_pair *pair)
 561 {
 562         return rule->buf + pair->key_name_off;
 563 }
 564
 565 static int match_key(const char *key_name, struct udev_rule *rule, struct key *key, const char *val)
 566 {
 567         int match;
 568         char value[PATH_SIZE];
 569         char *key_value;
 570         char *pos;
 571
 572         if (key->operation != KEY_OP_MATCH &&
 573             key->operation != KEY_OP_NOMATCH)
 574                 return 0;
 575
 576         strlcpy(value, rule->buf + key->val_off, sizeof(value));
 577         key_value = value;
 578
 579         dbg("key %s value='%s'", key_name, key_value);
 580         while (key_value) {
 581                 pos = strchr(key_value, '|');
 582                 if (pos) {
 583                         pos[0] = '\0';
 584                         pos++;
 585                 }
 586                 dbg("match %s '%s' <-> '%s'", key_name, key_value, val);
 587                 match = (fnmatch(key_value, val, 0) == 0);
 588                 if (match && (key->operation != KEY_OP_NOMATCH)) {
 589                         dbg("%s is true (matching value)", key_name);
 590                         return 0;
 591                 }
 592                 if (!match && (key->operation == KEY_OP_NOMATCH)) {
 593                         dbg("%s is true (non-matching value)", key_name);
 594                         return 0;
 595                 }
 596                 key_value = pos;
 597         }
 598         dbg("%s is false", key_name);
 599         return -1;
 600 }
 601
 602 /* match a single rule against a given device and possibly its parent devices */
 603 static int match_rule(struct udevice *udev, struct udev_rule *rule)
 604 {
 605         int i;
 606
 607         if (match_key("ACTION", rule, &rule->action, udev->action))
 608                 goto nomatch;
 609
 610         if (match_key("KERNEL", rule, &rule->kernel, udev->dev->kernel))
 611                 goto nomatch;
 612
 613         if (match_key("SUBSYSTEM", rule, &rule->subsystem, udev->dev->subsystem))
 614                 goto nomatch;
 615
 616         if (match_key("DEVPATH", rule, &rule->devpath, udev->dev->devpath))
 617                 goto nomatch;
 618
 619         if (match_key("DRIVER", rule, &rule->driver, udev->dev->driver))
 620                 goto nomatch;
 621
 622         /* match NAME against a value assigned by an earlier rule */
 623         if (match_key("NAME", rule, &rule->name, udev->name))
 624                 goto nomatch;
 625
 626         for (i = 0; i < rule->env.count; i++) {
 627                 struct key_pair *pair = &rule->env.keys[i];
 628
 629                 /* we only check for matches, assignments will be handled later */
 630                 if (pair->key.operation == KEY_OP_MATCH ||
 631                     pair->key.operation == KEY_OP_NOMATCH) {
 632                         const char *key_name = key_pair_name(rule, pair);
 633                         const char *value = getenv(key_name);
 634
 635                         if (!value) {
 636                                 dbg("ENV{'%s'} is not set, treat as empty", key_name);
 637                                 value = "";
 638                         }
 639                         if (match_key("ENV", rule, &pair->key, value))
 640                                 goto nomatch;
 641                 }
 642         }
 643
 644         if (rule->wait_for_sysfs.operation != KEY_OP_UNSET) {
 645                 int found;
 646
 647                 found = (wait_for_sysfs(udev, key_val(rule, &rule->wait_for_sysfs), 3) == 0);
 648                 if (!found && (rule->wait_for_sysfs.operation != KEY_OP_NOMATCH))
 649                         goto nomatch;
 650         }
 651
 652         /* check for matching sysfs attribute pairs */
 653         for (i = 0; i < rule->attr.count; i++) {
 654                 struct key_pair *pair = &rule->attr.keys[i];
 655
 656                 if (pair->key.operation == KEY_OP_MATCH ||
 657                     pair->key.operation == KEY_OP_NOMATCH) {
 658                         const char *key_name = key_pair_name(rule, pair);
 659                         const char *key_value = key_val(rule, &pair->key);
 660                         const char *value;
 661                         char val[VALUE_SIZE];
 662                         size_t len;
 663
 664                         value = sysfs_attr_get_value(udev->dev->devpath, key_name);
 665                         if (value == NULL)
 666                                 goto nomatch;
 667                         strlcpy(val, value, sizeof(val));
 668
 669                         /* strip trailing whitespace of value, if not asked to match for it */
 670                         len = strlen(key_value);
 671                         if (len > 0 && !isspace(key_value[len-1])) {
 672                                 len = strlen(val);
 673                                 while (len > 0 && isspace(val[len-1]))
 674                                         val[--len] = '\0';
 675                                 dbg("removed %zi trailing whitespace chars from '%s'", strlen(val)-len, val);
 676                         }
 677
 678                         if (match_key("ATTR", rule, &pair->key, val))
 679                                 goto nomatch;
 680                 }
 681         }
 682
 683         /* walk up the chain of parent devices and find a match */
 684         udev->dev_parent = udev->dev;
 685         while (1) {
 686                 /* check for matching kernel device name */
 687                 if (match_key("KERNELS", rule, &rule->kernels, udev->dev_parent->kernel))
 688                         goto try_parent;
 689
 690                 /* check for matching subsystem value */
 691                 if (match_key("SUBSYSTEMS", rule, &rule->subsystems, udev->dev_parent->subsystem))
 692                         goto try_parent;
 693
 694                 /* check for matching driver */
 695                 if (match_key("DRIVERS", rule, &rule->drivers, udev->dev_parent->driver))
 696                         goto try_parent;
 697
 698                 /* check for matching sysfs attrubute pairs */
 699                 for (i = 0; i < rule->attrs.count; i++) {
 700                         struct key_pair *pair = &rule->attrs.keys[i];
 701
 702                         if (pair->key.operation == KEY_OP_MATCH ||
 703                             pair->key.operation == KEY_OP_NOMATCH) {
 704                                 const char *key_name = key_pair_name(rule, pair);
 705                                 const char *key_value = key_val(rule, &pair->key);
 706                                 const char *value;
 707                                 char val[VALUE_SIZE];
 708                                 size_t len;
 709
 710                                 value = sysfs_attr_get_value(udev->dev_parent->devpath, key_name);
 711                                 if (value == NULL)
 712                                         value = sysfs_attr_get_value(udev->dev->devpath, key_name);
 713                                 if (value == NULL)
 714                                         goto try_parent;
 715                                 strlcpy(val, value, sizeof(val));
 716
 717                                 /* strip trailing whitespace of value, if not asked to match for it */
 718                                 len = strlen(key_value);
 719                                 if (len > 0 && !isspace(key_value[len-1])) {
 720                                         len = strlen(val);
 721                                         while (len > 0 && isspace(val[len-1]))
 722                                                 val[--len] = '\0';
 723                                         dbg("removed %zi trailing whitespace chars from '%s'", strlen(val)-len, val);
 724                                 }
 725
 726                                 if (match_key("ATTRS", rule, &pair->key, val))
 727                                         goto try_parent;
 728                         }
 729                 }
 730
 731                 /* found matching device  */
 732                 break;
 733 try_parent:
 734                 /* move to parent device */
 735                 dbg("try parent sysfs device");
 736                 udev->dev_parent = sysfs_device_get_parent(udev->dev_parent);
 737                 if (udev->dev_parent == NULL)
 738                         goto nomatch;
 739                 dbg("looking at dev_parent->devpath='%s'", udev->dev_parent->devpath);
 740                 dbg("looking at dev_parent->kernel='%s'", udev->dev_parent->kernel);
 741         }
 742
 743         /* execute external program */
 744         if (rule->program.operation != KEY_OP_UNSET) {
 745                 char program[PATH_SIZE];
 746                 char result[PATH_SIZE];
 747
 748                 strlcpy(program, key_val(rule, &rule->program), sizeof(program));
 749                 udev_rules_apply_format(udev, program, sizeof(program));
 750                 if (run_program(program, udev->dev->subsystem, result, sizeof(result), NULL, (udev_log_priority >= LOG_INFO)) != 0) {
 751                         dbg("PROGRAM is false");
 752                         udev->program_result[0] = '\0';
 753                         if (rule->program.operation != KEY_OP_NOMATCH)
 754                                 goto nomatch;
 755                 } else {
 756                         int count;
 757
 758                         dbg("PROGRAM matches");
 759                         remove_trailing_chars(result, '\n');
 760                         count = replace_untrusted_chars(result);
 761                         if (count)
 762                                 info("%i untrusted character(s) replaced" , count);
 763                         dbg("result is '%s'", result);
 764                         strlcpy(udev->program_result, result, sizeof(udev->program_result));
 765                         dbg("PROGRAM returned successful");
 766                         if (rule->program.operation == KEY_OP_NOMATCH)
 767                                 goto nomatch;
 768                 }
 769                 dbg("PROGRAM key is true");
 770         }
 771
 772         /* check for matching result of external program */
 773         if (match_key("RESULT", rule, &rule->result, udev->program_result))
 774                 goto nomatch;
 775
 776         /* import variables returned from program or or file into environment */
 777         if (rule->import.operation != KEY_OP_UNSET) {
 778                 char import[PATH_SIZE];
 779                 int rc = -1;
 780
 781                 strlcpy(import, key_val(rule, &rule->import), sizeof(import));
 782                 udev_rules_apply_format(udev, import, sizeof(import));
 783                 dbg("check for IMPORT import='%s'", import);
 784                 if (rule->import_type == IMPORT_PROGRAM) {
 785                         rc = import_program_into_env(udev, import);
 786                 } else if (rule->import_type == IMPORT_FILE) {
 787                         dbg("import file import='%s'", import);
 788                         rc = import_file_into_env(udev, import);
 789                 } else if (rule->import_type == IMPORT_PARENT) {
 790                         dbg("import parent import='%s'", import);
 791                         rc = import_parent_into_env(udev, import);
 792                 }
 793                 if (rc != 0) {
 794                         dbg("IMPORT failed");
 795                         if (rule->import.operation != KEY_OP_NOMATCH)
 796                                 goto nomatch;
 797                 } else
 798                         dbg("IMPORT '%s' imported", key_val(rule, &rule->import));
 799                 dbg("IMPORT key is true");
 800         }
 801
 802         /* rule matches, if we have ENV assignments export it */
 803         for (i = 0; i < rule->env.count; i++) {
 804                 struct key_pair *pair = &rule->env.keys[i];
 805
 806                 if (pair->key.operation == KEY_OP_ASSIGN) {
 807                         const char *key_name = key_pair_name(rule, pair);
 808                         const char *value = key_val(rule, &pair->key);
 809                         char *key_value = name_list_key_add(&udev->env_list, key_name, value);
 810                         if (key_value == NULL)
 811                                 break;
 812
 813                         udev_rules_apply_format(udev, key_value, NAME_SIZE);
 814                         putenv(key_value);
 815                         dbg("export ENV '%s'", key_value);
 816                 }
 817         }
 818
 819         /* if we have ATTR assignements write value to sysfs file */
 820         for (i = 0; i < rule->attr.count; i++) {
 821                 struct key_pair *pair = &rule->attr.keys[i];
 822
 823                 if (pair->key.operation == KEY_OP_ASSIGN) {
 824                         const char *key_name = key_pair_name(rule, pair);
 825                         const char *key_value = key_val(rule, &pair->key);
 826                         char attr[PATH_SIZE];
 827                         FILE *f;
 828
 829                         strlcpy(attr, sysfs_path, sizeof(attr));
 830                         strlcat(attr, udev->dev->devpath, sizeof(attr));
 831                         strlcat(attr, "/", sizeof(attr));
 832                         strlcat(attr, key_name, sizeof(attr));
 833                         dbg("write '%s' to '%s'", key_value, attr);
 834                         f = fopen(attr, "w");
 835                         if (f != NULL) {
 836                                 if (fprintf(f, "%s\n", key_value) <= 0)
 837                                         err("error writing ATTR{%s}: %s", attr, strerror(errno));
 838                                 fclose(f);
 839                         } else
 840                                 err("error opening ATTR{%s} for writing: %s", attr, strerror(errno));
 841                 }
 842         }
 843         return 0;
 844
 845 nomatch:
 846         return -1;
 847 }
 848
 849 int udev_rules_get_name(struct udev_rules *rules, struct udevice *udev)
 850 {
 851         struct udev_rule *rule;
 852         int name_set = 0;
 853
 854         dbg("udev->dev->devpath='%s'", udev->dev->devpath);
 855         dbg("udev->dev->kernel='%s'", udev->dev->kernel);
 856
 857         /* look for a matching rule to apply */
 858         udev_rules_iter_init(rules);
 859         while (1) {
 860                 rule = udev_rules_iter_next(rules);
 861                 if (rule == NULL)
 862                         break;
 863
 864                 if (name_set &&
 865                     (rule->name.operation == KEY_OP_ASSIGN ||
 866                      rule->name.operation == KEY_OP_ASSIGN_FINAL ||
 867                      rule->name.operation == KEY_OP_ADD)) {
 868                         dbg("node name already set, rule ignored");
 869                         continue;
 870                 }
 871
 872                 dbg("process rule");
 873                 if (match_rule(udev, rule) == 0) {
 874                         /* apply options */
 875                         if (rule->ignore_device) {
 876                                 info("rule applied, '%s' is ignored", udev->dev->kernel);
 877                                 udev->ignore_device = 1;
 878                                 return 0;
 879                         }
 880                         if (rule->ignore_remove) {
 881                                 udev->ignore_remove = 1;
 882                                 dbg("remove event should be ignored");
 883                         }
 884                         /* apply all_partitions option only at a main block device */
 885                         if (rule->partitions &&
 886                             strcmp(udev->dev->subsystem, "block") == 0 && udev->dev->kernel_number[0] == '\0') {
 887                                 udev->partitions = rule->partitions;
 888                                 dbg("creation of partition nodes requested");
 889                         }
 890
 891                         /* apply permissions */
 892                         if (!udev->mode_final && rule->mode != 0000) {
 893                                 if (rule->mode_operation == KEY_OP_ASSIGN_FINAL)
 894                                         udev->mode_final = 1;
 895                                 udev->mode = rule->mode;
 896                                 dbg("applied mode=%#o to '%s'", rule->mode, udev->dev->kernel);
 897                         }
 898                         if (!udev->owner_final && rule->owner.operation != KEY_OP_UNSET) {
 899                                 if (rule->owner.operation == KEY_OP_ASSIGN_FINAL)
 900                                         udev->owner_final = 1;
 901                                 strlcpy(udev->owner, key_val(rule, &rule->owner), sizeof(udev->owner));
 902                                 udev_rules_apply_format(udev, udev->owner, sizeof(udev->owner));
 903                                 dbg("applied owner='%s' to '%s'", udev->owner, udev->dev->kernel);
 904                         }
 905                         if (!udev->group_final && rule->group.operation != KEY_OP_UNSET) {
 906                                 if (rule->group.operation == KEY_OP_ASSIGN_FINAL)
 907                                         udev->group_final = 1;
 908                                 strlcpy(udev->group, key_val(rule, &rule->group), sizeof(udev->group));
 909                                 udev_rules_apply_format(udev, udev->group, sizeof(udev->group));
 910                                 dbg("applied group='%s' to '%s'", udev->group, udev->dev->kernel);
 911                         }
 912
 913                         /* collect symlinks */
 914                         if (!udev->symlink_final && rule->symlink.operation != KEY_OP_UNSET) {
 915                                 char temp[PATH_SIZE];
 916                                 char *pos, *next;
 917                                 int count;
 918
 919                                 if (rule->symlink.operation == KEY_OP_ASSIGN_FINAL)
 920                                         udev->symlink_final = 1;
 921                                 if (rule->symlink.operation == KEY_OP_ASSIGN || rule->symlink.operation == KEY_OP_ASSIGN_FINAL) {
 922                                         info("reset symlink list");
 923                                         name_list_cleanup(&udev->symlink_list);
 924                                 }
 925                                 strlcpy(temp, key_val(rule, &rule->symlink), sizeof(temp));
 926                                 udev_rules_apply_format(udev, temp, sizeof(temp));
 927                                 count = replace_untrusted_chars(temp);
 928                                 if (count)
 929                                         info("%i untrusted character(s) replaced" , count);
 930                                 dbg("rule applied, added symlink(s) '%s'", temp);
 931
 932                                 /* add multiple symlinks separated by spaces */
 933                                 pos = temp;
 934                                 while (isspace(pos[0]))
 935                                         pos++;
 936                                 next = strchr(pos, ' ');
 937                                 while (next) {
 938                                         next[0] = '\0';
 939                                         info("add symlink '%s'", pos);
 940                                         name_list_add(&udev->symlink_list, pos, 0);
 941                                         while (isspace(next[1]))
 942                                                 next++;
 943                                         pos = &next[1];
 944                                         next = strchr(pos, ' ');
 945                                 }
 946                                 if (pos[0] != '\0') {
 947                                         info("add symlink '%s'", pos);
 948                                         name_list_add(&udev->symlink_list, pos, 0);
 949                                 }
 950                         }
 951
 952                         /* set name, later rules with name set will be ignored */
 953                         if (rule->name.operation == KEY_OP_ASSIGN ||
 954                             rule->name.operation == KEY_OP_ASSIGN_FINAL ||
 955                             rule->name.operation == KEY_OP_ADD) {
 956                                 int count;
 957
 958                                 name_set = 1;
 959                                 strlcpy(udev->name, key_val(rule, &rule->name), sizeof(udev->name));
 960                                 udev_rules_apply_format(udev, udev->name, sizeof(udev->name));
 961                                 count = replace_untrusted_chars(udev->name);
 962                                 if (count)
 963                                         info("%i untrusted character(s) replaced", count);
 964
 965                                 info("rule applied, '%s' becomes '%s'", udev->dev->kernel, udev->name);
 966                                 if (strcmp(udev->dev->subsystem, "net") != 0)
 967                                         dbg("name, '%s' is going to have owner='%s', group='%s', mode=%#o partitions=%i",
 968                                             udev->name, udev->owner, udev->group, udev->mode, udev->partitions);
 969                         }
 970
 971                         if (!udev->run_final && rule->run.operation != KEY_OP_UNSET) {
 972                                 if (rule->run.operation == KEY_OP_ASSIGN_FINAL)
 973                                         udev->run_final = 1;
 974                                 if (rule->run.operation == KEY_OP_ASSIGN || rule->run.operation == KEY_OP_ASSIGN_FINAL) {
 975                                         info("reset run list");
 976                                         name_list_cleanup(&udev->run_list);
 977                                 }
 978                                 dbg("add run '%s'", key_val(rule, &rule->run));
 979                                 name_list_add(&udev->run_list, key_val(rule, &rule->run), 0);
 980                         }
 981
 982                         if (rule->last_rule) {
 983                                 dbg("last rule to be applied");
 984                                 break;
 985                         }
 986
 987                         if (rule->goto_label.operation != KEY_OP_UNSET) {
 988                                 dbg("moving forward to label '%s'", key_val(rule, &rule->goto_label));
 989                                 udev_rules_iter_label(rules, key_val(rule, &rule->goto_label));
 990                         }
 991                 }
 992         }
 993
 994         if (!name_set) {
 995                 strlcpy(udev->name, udev->dev->kernel, sizeof(udev->name));
 996                 info("no node name set, will use kernel name '%s'", udev->name);
 997         }
 998
 999         if (udev->tmp_node[0] != '\0') {
1000                 dbg("removing temporary device node");
1001                 unlink_secure(udev->tmp_node);
1002                 udev->tmp_node[0] = '\0';
1003         }
1004
1005         return 0;
1006 }
1007
1008 int udev_rules_get_run(struct udev_rules *rules, struct udevice *udev)
1009 {
1010         struct udev_rule *rule;
1011
1012         dbg("udev->kernel='%s'", udev->dev->kernel);
1013
1014         /* look for a matching rule to apply */
1015         udev_rules_iter_init(rules);
1016         while (1) {
1017                 rule = udev_rules_iter_next(rules);
1018                 if (rule == NULL)
1019                         break;
1020
1021                 dbg("process rule");
1022                 if (rule->name.operation != KEY_OP_UNSET || rule->symlink.operation != KEY_OP_UNSET ||
1023                     rule->mode_operation != KEY_OP_UNSET || rule->owner.operation != KEY_OP_UNSET || rule->group.operation != KEY_OP_UNSET) {
1024                         dbg("skip rule that names a device");
1025                         continue;
1026                 }
1027
1028                 if (match_rule(udev, rule) == 0) {
1029                         if (rule->ignore_device) {
1030                                 info("rule applied, '%s' is ignored", udev->dev->kernel);
1031                                 udev->ignore_device = 1;
1032                                 return 0;
1033                         }
1034
1035                         if (!udev->run_final && rule->run.operation != KEY_OP_UNSET) {
1036                                 if (rule->run.operation == KEY_OP_ASSIGN || rule->run.operation == KEY_OP_ASSIGN_FINAL) {
1037                                         info("reset run list");
1038                                         name_list_cleanup(&udev->run_list);
1039                                 }
1040                                 dbg("add run '%s'", key_val(rule, &rule->run));
1041                                 name_list_add(&udev->run_list, key_val(rule, &rule->run), 0);
1042                                 if (rule->run.operation == KEY_OP_ASSIGN_FINAL)
1043                                         break;
1044                         }
1045
1046                         if (rule->last_rule) {
1047                                 dbg("last rule to be applied");
1048                                 break;
1049                         }
1050
1051                         if (rule->goto_label.operation != KEY_OP_UNSET) {
1052                                 dbg("moving forward to label '%s'", key_val(rule, &rule->goto_label));
1053                                 udev_rules_iter_label(rules, key_val(rule, &rule->goto_label));
1054                         }
1055                 }
1056         }
1057
1058         return 0;
1059 }