udev_rules.c

   1 /*
   2  * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
   3  * Copyright (C) 2003-2006 Kay Sievers <kay.sievers@vrfy.org>
   4  *
   5  *      This program is free software; you can redistribute it and/or modify it
   6  *      under the terms of the GNU General Public License as published by the
   7  *      Free Software Foundation version 2 of the License.
   8  *
   9  *      This program is distributed in the hope that it will be useful, but
  10  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *      General Public License for more details.
  13  *
  14  *      You should have received a copy of the GNU General Public License along
  15  *      with this program; if not, write to the Free Software Foundation, Inc.,
  16  *      51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  17  *
  18  */
  19
  20 #include <stddef.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <stdio.h>
  24 #include <fcntl.h>
  25 #include <ctype.h>
  26 #include <unistd.h>
  27 #include <errno.h>
  28 #include <syslog.h>
  29 #include <fnmatch.h>
  30 #include <sys/wait.h>
  31 #include <sys/stat.h>
  32
  33 #include "udev.h"
  34 #include "udev_rules.h"
  35
  36
  37 /* extract possible {attr} and move str behind it */
  38 static char *get_format_attribute(char **str)
  39 {
  40         char *pos;
  41         char *attr = NULL;
  42
  43         if (*str[0] == '{') {
  44                 pos = strchr(*str, '}');
  45                 if (pos == NULL) {
  46                         err("missing closing brace for format");
  47                         return NULL;
  48                 }
  49                 pos[0] = '\0';
  50                 attr = *str+1;
  51                 *str = pos+1;
  52                 dbg("attribute='%s', str='%s'", attr, *str);
  53         }
  54         return attr;
  55 }
  56
  57 /* extract possible format length and move str behind it*/
  58 static int get_format_len(char **str)
  59 {
  60         int num;
  61         char *tail;
  62
  63         if (isdigit(*str[0])) {
  64                 num = (int) strtoul(*str, &tail, 10);
  65                 if (num > 0) {
  66                         *str = tail;
  67                         dbg("format length=%i", num);
  68                         return num;
  69                 } else {
  70                         err("format parsing error '%s'", *str);
  71                 }
  72         }
  73         return -1;
  74 }
  75
  76 static int get_key(char **line, char **key, char **value)
  77 {
  78         char *linepos;
  79         char *temp;
  80
  81         linepos = *line;
  82         if (linepos == NULL)
  83                 return -1;
  84
  85         /* skip whitespace */
  86         while (isspace(linepos[0]))
  87                 linepos++;
  88
  89         /* get the key */
  90         temp = strchr(linepos, '=');
  91         if (temp == NULL || temp == linepos)
  92                 return -1;
  93         temp[0] = '\0';
  94         *key = linepos;
  95         linepos = &temp[1];
  96
  97         /* get a quoted value */
  98         if (linepos[0] == '"' || linepos[0] == '\'') {
  99                 temp = strchr(&linepos[1], linepos[0]);
 100                 if (temp != NULL) {
 101                         temp[0] = '\0';
 102                         *value = &linepos[1];
 103                         goto out;
 104                 }
 105         }
 106
 107         /* get the value*/
 108         temp = strchr(linepos, '\n');
 109         if (temp != NULL)
 110                 temp[0] = '\0';
 111         *value = linepos;
 112 out:
 113         return 0;
 114 }
 115
 116 static int import_keys_into_env(struct udevice *udev, const char *buf, size_t bufsize)
 117 {
 118         char line[LINE_SIZE];
 119         const char *bufline;
 120         char *linepos;
 121         char *variable;
 122         char *value;
 123         size_t cur;
 124         size_t count;
 125         int lineno;
 126
 127         /* loop through the whole buffer */
 128         lineno = 0;
 129         cur = 0;
 130         while (cur < bufsize) {
 131                 count = buf_get_line(buf, bufsize, cur);
 132                 bufline = &buf[cur];
 133                 cur += count+1;
 134                 lineno++;
 135
 136                 if (count >= sizeof(line)) {
 137                         err("line too long, conf line skipped %s, line %d", udev_config_filename, lineno);
 138                         continue;
 139                 }
 140
 141                 /* eat the whitespace */
 142                 while ((count > 0) && isspace(bufline[0])) {
 143                         bufline++;
 144                         count--;
 145                 }
 146                 if (count == 0)
 147                         continue;
 148
 149                 /* see if this is a comment */
 150                 if (bufline[0] == COMMENT_CHARACTER)
 151                         continue;
 152
 153                 memcpy(line, bufline, count);
 154                 line[count] = '\0';
 155
 156                 linepos = line;
 157                 if (get_key(&linepos, &variable, &value) == 0) {
 158                         dbg("import '%s=%s'", variable, value);
 159
 160                         /* handle device, renamed by external tool, returning new path */
 161                         if (strcmp(variable, "DEVPATH") == 0) {
 162                                 info("updating devpath from '%s' to '%s'", udev->dev->devpath, value);
 163                                 sysfs_device_set_values(udev->dev, value, NULL, NULL);
 164                         } else
 165                                 name_list_key_add(&udev->env_list, variable, value);
 166                         setenv(variable, value, 1);
 167                 }
 168         }
 169
 170         return 0;
 171 }
 172
 173 static int import_file_into_env(struct udevice *udev, const char *filename)
 174 {
 175         char *buf;
 176         size_t bufsize;
 177
 178         if (file_map(filename, &buf, &bufsize) != 0) {
 179                 err("can't open '%s': %s", filename, strerror(errno));
 180                 return -1;
 181         }
 182         import_keys_into_env(udev, buf, bufsize);
 183         file_unmap(buf, bufsize);
 184
 185         return 0;
 186 }
 187
 188 static int import_program_into_env(struct udevice *udev, const char *program)
 189 {
 190         char result[2048];
 191         size_t reslen;
 192
 193         if (run_program(program, udev->dev->subsystem, result, sizeof(result), &reslen, (udev_log_priority >= LOG_INFO)) != 0)
 194                 return -1;
 195         return import_keys_into_env(udev, result, reslen);
 196 }
 197
 198 static int import_parent_into_env(struct udevice *udev, const char *filter)
 199 {
 200         struct sysfs_device *dev_parent;
 201         int rc = -1;
 202
 203         dev_parent = sysfs_device_get_parent(udev->dev);
 204         if (dev_parent != NULL) {
 205                 struct udevice *udev_parent;
 206                 struct name_entry *name_loop;
 207
 208                 dbg("found parent '%s', get the node name", dev_parent->devpath);
 209                 udev_parent = udev_device_init(NULL);
 210                 if (udev_parent == NULL)
 211                         return -1;
 212                 /* import the udev_db of the parent */
 213                 if (udev_db_get_device(udev_parent, dev_parent->devpath) == 0) {
 214                         dbg("import stored parent env '%s'", udev_parent->name);
 215                         list_for_each_entry(name_loop, &udev_parent->env_list, node) {
 216                                 char name[NAME_SIZE];
 217                                 char *pos;
 218
 219                                 strlcpy(name, name_loop->name, sizeof(name));
 220                                 pos = strchr(name, '=');
 221                                 if (pos) {
 222                                         pos[0] = '\0';
 223                                         pos++;
 224                                         if (fnmatch(filter, name, 0) == 0) {
 225                                                 dbg("import key '%s'", name_loop->name);
 226                                                 name_list_add(&udev->env_list, name_loop->name, 0);
 227                                                 setenv(name, pos, 1);
 228                                         } else
 229                                                 dbg("skip key '%s'", name_loop->name);
 230                                 }
 231                         }
 232                         rc = 0;
 233                 } else
 234                         dbg("parent not found in database");
 235                 udev_device_cleanup(udev_parent);
 236         }
 237
 238         return rc;
 239 }
 240
 241 #define WAIT_LOOP_PER_SECOND            50
 242 static int wait_for_sysfs(struct udevice *udev, const char *file, int timeout)
 243 {
 244         char devicepath[PATH_SIZE];
 245         char filepath[PATH_SIZE];
 246         struct stat stats;
 247         int loop = timeout * WAIT_LOOP_PER_SECOND;
 248
 249         strlcpy(devicepath, sysfs_path, sizeof(devicepath));
 250         strlcat(devicepath, udev->dev->devpath, sizeof(devicepath));
 251         strlcpy(filepath, devicepath, sizeof(filepath));
 252         strlcat(filepath, "/", sizeof(filepath));
 253         strlcat(filepath, file, sizeof(filepath));
 254
 255         dbg("will wait %i sec for '%s'", timeout, filepath);
 256         while (--loop) {
 257                 /* lookup file */
 258                 if (stat(filepath, &stats) == 0) {
 259                         info("file '%s' appeared after %i loops", filepath, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
 260                         return 0;
 261                 }
 262                 /* make sure, the device did not disappear in the meantime */
 263                 if (stat(devicepath, &stats) != 0) {
 264                         info("device disappeared while waiting for '%s'", filepath);
 265                         return -2;
 266                 }
 267                 info("wait for '%s' for %i mseconds", filepath, 1000 / WAIT_LOOP_PER_SECOND);
 268                 usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
 269         }
 270         err("waiting for '%s' failed", filepath);
 271         return -1;
 272 }
 273
 274 void udev_rules_apply_format(struct udevice *udev, char *string, size_t maxsize)
 275 {
 276         char temp[PATH_SIZE];
 277         char temp2[PATH_SIZE];
 278         char *head, *tail, *pos, *cpos, *attr, *rest;
 279         int len;
 280         int i;
 281         int count;
 282         enum subst_type {
 283                 SUBST_UNKNOWN,
 284                 SUBST_DEVPATH,
 285                 SUBST_KERNEL,
 286                 SUBST_KERNEL_NUMBER,
 287                 SUBST_ID,
 288                 SUBST_MAJOR,
 289                 SUBST_MINOR,
 290                 SUBST_RESULT,
 291                 SUBST_ATTR,
 292                 SUBST_PARENT,
 293                 SUBST_TEMP_NODE,
 294                 SUBST_ROOT,
 295                 SUBST_ENV,
 296         };
 297         static const struct subst_map {
 298                 char *name;
 299                 char fmt;
 300                 enum subst_type type;
 301         } map[] = {
 302                 { .name = "devpath",    .fmt = 'p',     .type = SUBST_DEVPATH },
 303                 { .name = "number",     .fmt = 'n',     .type = SUBST_KERNEL_NUMBER },
 304                 { .name = "kernel",     .fmt = 'k',     .type = SUBST_KERNEL },
 305                 { .name = "id",         .fmt = 'b',     .type = SUBST_ID },
 306                 { .name = "major",      .fmt = 'M',     .type = SUBST_MAJOR },
 307                 { .name = "minor",      .fmt = 'm',     .type = SUBST_MINOR },
 308                 { .name = "result",     .fmt = 'c',     .type = SUBST_RESULT },
 309                 { .name = "attr",       .fmt = 's',     .type = SUBST_ATTR },
 310                 { .name = "sysfs",      .fmt = 's',     .type = SUBST_ATTR },
 311                 { .name = "parent",     .fmt = 'P',     .type = SUBST_PARENT },
 312                 { .name = "tempnode",   .fmt = 'N',     .type = SUBST_TEMP_NODE },
 313                 { .name = "root",       .fmt = 'r',     .type = SUBST_ROOT },
 314                 { .name = "env",        .fmt = 'E',     .type = SUBST_ENV },
 315                 { NULL, '\0', 0 }
 316         };
 317         enum subst_type type;
 318         const struct subst_map *subst;
 319
 320         head = string;
 321         while (1) {
 322                 len = -1;
 323                 while (head[0] != '\0') {
 324                         if (head[0] == '$') {
 325                                 /* substitute named variable */
 326                                 if (head[1] == '\0')
 327                                         break;
 328                                 if (head[1] == '$') {
 329                                         strlcpy(temp, head+2, sizeof(temp));
 330                                         strlcpy(head+1, temp, maxsize);
 331                                         head++;
 332                                         continue;
 333                                 }
 334                                 head[0] = '\0';
 335                                 for (subst = map; subst->name; subst++) {
 336                                         if (strncasecmp(&head[1], subst->name, strlen(subst->name)) == 0) {
 337                                                 type = subst->type;
 338                                                 tail = head + strlen(subst->name)+1;
 339                                                 dbg("will substitute format name '%s'", subst->name);
 340                                                 goto found;
 341                                         }
 342                                 }
 343                                 head[0] = '$';
 344                                 err("unknown format variable '%s'", head);
 345                         } else if (head[0] == '%') {
 346                                 /* substitute format char */
 347                                 if (head[1] == '\0')
 348                                         break;
 349                                 if (head[1] == '%') {
 350                                         strlcpy(temp, head+2, sizeof(temp));
 351                                         strlcpy(head+1, temp, maxsize);
 352                                         head++;
 353                                         continue;
 354                                 }
 355                                 head[0] = '\0';
 356                                 tail = head+1;
 357                                 len = get_format_len(&tail);
 358                                 for (subst = map; subst->name; subst++) {
 359                                         if (tail[0] == subst->fmt) {
 360                                                 type = subst->type;
 361                                                 tail++;
 362                                                 dbg("will substitute format char '%c'", subst->fmt);
 363                                                 goto found;
 364                                         }
 365                                 }
 366                                 head[0] = '%';
 367                                 err("unknown format char '%c'", tail[0]);
 368                         }
 369                         head++;
 370                 }
 371                 break;
 372 found:
 373                 attr = get_format_attribute(&tail);
 374                 strlcpy(temp, tail, sizeof(temp));
 375                 dbg("format=%i, string='%s', tail='%s'", type ,string, tail);
 376
 377                 switch (type) {
 378                 case SUBST_DEVPATH:
 379                         strlcat(string, udev->dev->devpath, maxsize);
 380                         dbg("substitute devpath '%s'", udev->dev->devpath);
 381                         break;
 382                 case SUBST_KERNEL:
 383                         strlcat(string, udev->dev->kernel, maxsize);
 384                         dbg("substitute kernel name '%s'", udev->dev->kernel);
 385                         break;
 386                 case SUBST_KERNEL_NUMBER:
 387                         strlcat(string, udev->dev->kernel_number, maxsize);
 388                         dbg("substitute kernel number '%s'", udev->dev->kernel_number);
 389                         break;
 390                 case SUBST_ID:
 391                         if (udev->dev_parent != NULL) {
 392                                 strlcat(string, udev->dev_parent->kernel, maxsize);
 393                                 dbg("substitute id '%s'", udev->dev_parent->kernel);
 394                         }
 395                         break;
 396                 case SUBST_MAJOR:
 397                         sprintf(temp2, "%d", major(udev->devt));
 398                         strlcat(string, temp2, maxsize);
 399                         dbg("substitute major number '%s'", temp2);
 400                         break;
 401                 case SUBST_MINOR:
 402                         sprintf(temp2, "%d", minor(udev->devt));
 403                         strlcat(string, temp2, maxsize);
 404                         dbg("substitute minor number '%s'", temp2);
 405                         break;
 406                 case SUBST_RESULT:
 407                         if (udev->program_result[0] == '\0')
 408                                 break;
 409                         /* get part part of the result string */
 410                         i = 0;
 411                         if (attr != NULL)
 412                                 i = strtoul(attr, &rest, 10);
 413                         if (i > 0) {
 414                                 dbg("request part #%d of result string", i);
 415                                 cpos = udev->program_result;
 416                                 while (--i) {
 417                                         while (cpos[0] != '\0' && !isspace(cpos[0]))
 418                                                 cpos++;
 419                                         while (isspace(cpos[0]))
 420                                                 cpos++;
 421                                 }
 422                                 if (i > 0) {
 423                                         err("requested part of result string not found");
 424                                         break;
 425                                 }
 426                                 strlcpy(temp2, cpos, sizeof(temp2));
 427                                 /* %{2+}c copies the whole string from the second part on */
 428                                 if (rest[0] != '+') {
 429                                         cpos = strchr(temp2, ' ');
 430                                         if (cpos)
 431                                                 cpos[0] = '\0';
 432                                 }
 433                                 strlcat(string, temp2, maxsize);
 434                                 dbg("substitute part of result string '%s'", temp2);
 435                         } else {
 436                                 strlcat(string, udev->program_result, maxsize);
 437                                 dbg("substitute result string '%s'", udev->program_result);
 438                         }
 439                         break;
 440                 case SUBST_ATTR:
 441                         if (attr == NULL)
 442                                 err("missing file parameter for attr");
 443                         else {
 444                                 const char *value = NULL;
 445                                 size_t size;
 446
 447                                 /* first try the current device, other matches may have selected */
 448                                 if (udev->dev_parent != NULL && udev->dev_parent != udev->dev)
 449                                         value = sysfs_attr_get_value(udev->dev_parent->devpath, attr);
 450
 451                                 /* look at all devices along the chain of parents */
 452                                 if (value == NULL) {
 453                                         struct sysfs_device *dev_parent = udev->dev;
 454
 455                                         do {
 456                                                 dbg("looking at '%s'", dev_parent->devpath);
 457                                                 value = sysfs_attr_get_value(dev_parent->devpath, attr);
 458                                                 if (value != NULL) {
 459                                                         strlcpy(temp2, value, sizeof(temp2));
 460                                                         break;
 461                                                 }
 462                                                 dev_parent = sysfs_device_get_parent(dev_parent);
 463                                         } while (dev_parent != NULL);
 464                                 }
 465
 466                                 if (value == NULL)
 467                                         break;
 468
 469                                 /* strip trailing whitespace, and replace unwanted characters */
 470                                 size = strlcpy(temp2, value, sizeof(temp2));
 471                                 if (size >= sizeof(temp2))
 472                                         size = sizeof(temp2)-1;
 473                                 while (size > 0 && isspace(temp2[size-1]))
 474                                         temp2[--size] = '\0';
 475                                 count = replace_chars(temp2, ALLOWED_CHARS_INPUT);
 476                                 if (count > 0)
 477                                         info("%i character(s) replaced" , count);
 478                                 strlcat(string, temp2, maxsize);
 479                                 dbg("substitute sysfs value '%s'", temp2);
 480                         }
 481                         break;
 482                 case SUBST_PARENT:
 483                         {
 484                                 struct sysfs_device *dev_parent;
 485
 486                                 dev_parent = sysfs_device_get_parent(udev->dev);
 487                                 if (dev_parent != NULL) {
 488                                         struct udevice *udev_parent;
 489
 490                                         dbg("found parent '%s', get the node name", dev_parent->devpath);
 491                                         udev_parent = udev_device_init(NULL);
 492                                         if (udev_parent != NULL) {
 493                                                 /* lookup the name in the udev_db with the DEVPATH of the parent */
 494                                                 if (udev_db_get_device(udev_parent, dev_parent->devpath) == 0) {
 495                                                         strlcat(string, udev_parent->name, maxsize);
 496                                                         dbg("substitute parent node name'%s'", udev_parent->name);
 497                                                 } else
 498                                                         dbg("parent not found in database");
 499                                                 udev_device_cleanup(udev_parent);
 500                                         }
 501                                 }
 502                         }
 503                         break;
 504                 case SUBST_TEMP_NODE:
 505                         if (udev->tmp_node[0] == '\0' && major(udev->devt) > 0) {
 506                                 dbg("create temporary device node for callout");
 507                                 snprintf(udev->tmp_node, sizeof(udev->tmp_node), "%s/.tmp-%u-%u",
 508                                          udev_root, major(udev->devt), minor(udev->devt));
 509                                 udev->tmp_node[sizeof(udev->tmp_node)-1] = '\0';
 510                                 udev_node_mknod(udev, udev->tmp_node, udev->devt, 0600, 0, 0);
 511                         }
 512                         strlcat(string, udev->tmp_node, maxsize);
 513                         dbg("substitute temporary device node name '%s'", udev->tmp_node);
 514                         break;
 515                 case SUBST_ROOT:
 516                         strlcat(string, udev_root, maxsize);
 517                         dbg("substitute udev_root '%s'", udev_root);
 518                         break;
 519                 case SUBST_ENV:
 520                         if (attr == NULL) {
 521                                 dbg("missing attribute");
 522                                 break;
 523                         }
 524                         pos = getenv(attr);
 525                         if (pos == NULL) {
 526                                 dbg("env '%s' not available", attr);
 527                                 break;
 528                         }
 529                         dbg("substitute env '%s=%s'", attr, pos);
 530                         strlcat(string, pos, maxsize);
 531                         break;
 532                 default:
 533                         err("unknown substitution type=%i", type);
 534                         break;
 535                 }
 536                 /* possibly truncate to format-char specified length */
 537                 if (len >= 0 && len < (int)strlen(head)) {
 538                         head[len] = '\0';
 539                         dbg("truncate to %i chars, subtitution string becomes '%s'", len, head);
 540                 }
 541                 strlcat(string, temp, maxsize);
 542         }
 543 }
 544
 545 static char *key_val(struct udev_rule *rule, struct key *key)
 546 {
 547         return rule->buf + key->val_off;
 548 }
 549
 550 static char *key_pair_name(struct udev_rule *rule, struct key_pair *pair)
 551 {
 552         return rule->buf + pair->key_name_off;
 553 }
 554
 555 static int match_key(const char *key_name, struct udev_rule *rule, struct key *key, const char *val)
 556 {
 557         char value[PATH_SIZE];
 558         char *key_value;
 559         char *pos;
 560         int match = 0;
 561
 562         if (key->operation != KEY_OP_MATCH &&
 563             key->operation != KEY_OP_NOMATCH)
 564                 return 0;
 565
 566         /* look for a matching string, parts are separated by '|' */
 567         strlcpy(value, rule->buf + key->val_off, sizeof(value));
 568         key_value = value;
 569         dbg("key %s value='%s'", key_name, key_value);
 570         while (key_value) {
 571                 pos = strchr(key_value, '|');
 572                 if (pos) {
 573                         pos[0] = '\0';
 574                         pos++;
 575                 }
 576
 577                 dbg("match %s '%s' <-> '%s'", key_name, key_value, val);
 578                 match = (fnmatch(key_value, val, 0) == 0);
 579                 if (match)
 580                         break;
 581
 582                 key_value = pos;
 583         }
 584
 585         if (match && (key->operation == KEY_OP_MATCH)) {
 586                 dbg("%s is true (matching value)", key_name);
 587                 return 0;
 588         }
 589         if (!match && (key->operation == KEY_OP_NOMATCH)) {
 590                 dbg("%s is true (non-matching value)", key_name);
 591                 return 0;
 592         }
 593         return -1;
 594 }
 595
 596 /* match a single rule against a given device and possibly its parent devices */
 597 static int match_rule(struct udevice *udev, struct udev_rule *rule)
 598 {
 599         int i;
 600
 601         if (match_key("ACTION", rule, &rule->action, udev->action))
 602                 goto nomatch;
 603
 604         if (match_key("KERNEL", rule, &rule->kernel, udev->dev->kernel))
 605                 goto nomatch;
 606
 607         if (match_key("SUBSYSTEM", rule, &rule->subsystem, udev->dev->subsystem))
 608                 goto nomatch;
 609
 610         if (match_key("DEVPATH", rule, &rule->devpath, udev->dev->devpath))
 611                 goto nomatch;
 612
 613         if (match_key("DRIVER", rule, &rule->driver, udev->dev->driver))
 614                 goto nomatch;
 615
 616         /* match NAME against a value assigned by an earlier rule */
 617         if (match_key("NAME", rule, &rule->name, udev->name))
 618                 goto nomatch;
 619
 620         for (i = 0; i < rule->env.count; i++) {
 621                 struct key_pair *pair = &rule->env.keys[i];
 622
 623                 /* we only check for matches, assignments will be handled later */
 624                 if (pair->key.operation == KEY_OP_MATCH ||
 625                     pair->key.operation == KEY_OP_NOMATCH) {
 626                         const char *key_name = key_pair_name(rule, pair);
 627                         const char *value = getenv(key_name);
 628
 629                         if (!value) {
 630                                 dbg("ENV{'%s'} is not set, treat as empty", key_name);
 631                                 value = "";
 632                         }
 633                         if (match_key("ENV", rule, &pair->key, value))
 634                                 goto nomatch;
 635                 }
 636         }
 637
 638         if (rule->wait_for_sysfs.operation != KEY_OP_UNSET) {
 639                 int found;
 640
 641                 found = (wait_for_sysfs(udev, key_val(rule, &rule->wait_for_sysfs), 3) == 0);
 642                 if (!found && (rule->wait_for_sysfs.operation != KEY_OP_NOMATCH))
 643                         goto nomatch;
 644         }
 645
 646         /* check for matching sysfs attribute pairs */
 647         for (i = 0; i < rule->attr.count; i++) {
 648                 struct key_pair *pair = &rule->attr.keys[i];
 649
 650                 if (pair->key.operation == KEY_OP_MATCH ||
 651                     pair->key.operation == KEY_OP_NOMATCH) {
 652                         const char *key_name = key_pair_name(rule, pair);
 653                         const char *key_value = key_val(rule, &pair->key);
 654                         const char *value;
 655                         char val[VALUE_SIZE];
 656                         size_t len;
 657
 658                         value = sysfs_attr_get_value(udev->dev->devpath, key_name);
 659                         if (value == NULL)
 660                                 goto nomatch;
 661                         strlcpy(val, value, sizeof(val));
 662
 663                         /* strip trailing whitespace of value, if not asked to match for it */
 664                         len = strlen(key_value);
 665                         if (len > 0 && !isspace(key_value[len-1])) {
 666                                 len = strlen(val);
 667                                 while (len > 0 && isspace(val[len-1]))
 668                                         val[--len] = '\0';
 669                                 dbg("removed %zi trailing whitespace chars from '%s'", strlen(val)-len, val);
 670                         }
 671
 672                         if (match_key("ATTR", rule, &pair->key, val))
 673                                 goto nomatch;
 674                 }
 675         }
 676
 677         /* walk up the chain of parent devices and find a match */
 678         udev->dev_parent = udev->dev;
 679         while (1) {
 680                 /* check for matching kernel device name */
 681                 if (match_key("KERNELS", rule, &rule->kernels, udev->dev_parent->kernel))
 682                         goto try_parent;
 683
 684                 /* check for matching subsystem value */
 685                 if (match_key("SUBSYSTEMS", rule, &rule->subsystems, udev->dev_parent->subsystem))
 686                         goto try_parent;
 687
 688                 /* check for matching driver */
 689                 if (match_key("DRIVERS", rule, &rule->drivers, udev->dev_parent->driver))
 690                         goto try_parent;
 691
 692                 /* check for matching sysfs attribute pairs */
 693                 for (i = 0; i < rule->attrs.count; i++) {
 694                         struct key_pair *pair = &rule->attrs.keys[i];
 695
 696                         if (pair->key.operation == KEY_OP_MATCH ||
 697                             pair->key.operation == KEY_OP_NOMATCH) {
 698                                 const char *key_name = key_pair_name(rule, pair);
 699                                 const char *key_value = key_val(rule, &pair->key);
 700                                 const char *value;
 701                                 char val[VALUE_SIZE];
 702                                 size_t len;
 703
 704                                 value = sysfs_attr_get_value(udev->dev_parent->devpath, key_name);
 705                                 if (value == NULL)
 706                                         value = sysfs_attr_get_value(udev->dev->devpath, key_name);
 707                                 if (value == NULL)
 708                                         goto try_parent;
 709                                 strlcpy(val, value, sizeof(val));
 710
 711                                 /* strip trailing whitespace of value, if not asked to match for it */
 712                                 len = strlen(key_value);
 713                                 if (len > 0 && !isspace(key_value[len-1])) {
 714                                         len = strlen(val);
 715                                         while (len > 0 && isspace(val[len-1]))
 716                                                 val[--len] = '\0';
 717                                         dbg("removed %zi trailing whitespace chars from '%s'", strlen(val)-len, val);
 718                                 }
 719
 720                                 if (match_key("ATTRS", rule, &pair->key, val))
 721                                         goto try_parent;
 722                         }
 723                 }
 724
 725                 /* found matching device  */
 726                 break;
 727 try_parent:
 728                 /* move to parent device */
 729                 dbg("try parent sysfs device");
 730                 udev->dev_parent = sysfs_device_get_parent(udev->dev_parent);
 731                 if (udev->dev_parent == NULL)
 732                         goto nomatch;
 733                 dbg("looking at dev_parent->devpath='%s'", udev->dev_parent->devpath);
 734                 dbg("looking at dev_parent->kernel='%s'", udev->dev_parent->kernel);
 735         }
 736
 737         /* execute external program */
 738         if (rule->program.operation != KEY_OP_UNSET) {
 739                 char program[PATH_SIZE];
 740                 char result[PATH_SIZE];
 741
 742                 strlcpy(program, key_val(rule, &rule->program), sizeof(program));
 743                 udev_rules_apply_format(udev, program, sizeof(program));
 744                 if (run_program(program, udev->dev->subsystem, result, sizeof(result), NULL, (udev_log_priority >= LOG_INFO)) != 0) {
 745                         dbg("PROGRAM is false");
 746                         udev->program_result[0] = '\0';
 747                         if (rule->program.operation != KEY_OP_NOMATCH)
 748                                 goto nomatch;
 749                 } else {
 750                         int count;
 751
 752                         dbg("PROGRAM matches");
 753                         remove_trailing_chars(result, '\n');
 754                         count = replace_chars(result, ALLOWED_CHARS_INPUT);
 755                         if (count)
 756                                 info("%i character(s) replaced" , count);
 757                         dbg("result is '%s'", result);
 758                         strlcpy(udev->program_result, result, sizeof(udev->program_result));
 759                         dbg("PROGRAM returned successful");
 760                         if (rule->program.operation == KEY_OP_NOMATCH)
 761                                 goto nomatch;
 762                 }
 763                 dbg("PROGRAM key is true");
 764         }
 765
 766         /* check for matching result of external program */
 767         if (match_key("RESULT", rule, &rule->result, udev->program_result))
 768                 goto nomatch;
 769
 770         /* import variables returned from program or or file into environment */
 771         if (rule->import.operation != KEY_OP_UNSET) {
 772                 char import[PATH_SIZE];
 773                 int rc = -1;
 774
 775                 strlcpy(import, key_val(rule, &rule->import), sizeof(import));
 776                 udev_rules_apply_format(udev, import, sizeof(import));
 777                 dbg("check for IMPORT import='%s'", import);
 778                 if (rule->import_type == IMPORT_PROGRAM) {
 779                         rc = import_program_into_env(udev, import);
 780                 } else if (rule->import_type == IMPORT_FILE) {
 781                         dbg("import file import='%s'", import);
 782                         rc = import_file_into_env(udev, import);
 783                 } else if (rule->import_type == IMPORT_PARENT) {
 784                         dbg("import parent import='%s'", import);
 785                         rc = import_parent_into_env(udev, import);
 786                 }
 787                 if (rc != 0) {
 788                         dbg("IMPORT failed");
 789                         if (rule->import.operation != KEY_OP_NOMATCH)
 790                                 goto nomatch;
 791                 } else
 792                         dbg("IMPORT '%s' imported", key_val(rule, &rule->import));
 793                 dbg("IMPORT key is true");
 794         }
 795
 796         /* rule matches, if we have ENV assignments export it */
 797         for (i = 0; i < rule->env.count; i++) {
 798                 struct key_pair *pair = &rule->env.keys[i];
 799
 800                 if (pair->key.operation == KEY_OP_ASSIGN) {
 801                         char temp_value[NAME_SIZE];
 802                         const char *key_name = key_pair_name(rule, pair);
 803                         const char *value = key_val(rule, &pair->key);
 804
 805                         /* make sure we don't write to the same string we possibly read from */
 806                         strlcpy(temp_value, value, sizeof(temp_value));
 807                         udev_rules_apply_format(udev, temp_value, NAME_SIZE);
 808
 809                         if (temp_value[0] == '\0') {
 810                                 name_list_key_remove(&udev->env_list, key_name);
 811                                 unsetenv(key_name);
 812                                 info("unset ENV '%s'", key_name);
 813                         } else {
 814                                 char *key_value = name_list_key_add(&udev->env_list, key_name, temp_value);
 815
 816                                 if (key_value == NULL)
 817                                         break;
 818                                 putenv(key_value);
 819                                 info("set ENV '%s'", key_value);
 820                         }
 821                 }
 822         }
 823
 824         /* if we have ATTR assignments, write value to sysfs file */
 825         for (i = 0; i < rule->attr.count; i++) {
 826                 struct key_pair *pair = &rule->attr.keys[i];
 827
 828                 if (pair->key.operation == KEY_OP_ASSIGN) {
 829                         const char *key_name = key_pair_name(rule, pair);
 830                         char attr[PATH_SIZE];
 831                         char value[NAME_SIZE];
 832                         FILE *f;
 833
 834                         strlcpy(attr, sysfs_path, sizeof(attr));
 835                         strlcat(attr, udev->dev->devpath, sizeof(attr));
 836                         strlcat(attr, "/", sizeof(attr));
 837                         strlcat(attr, key_name, sizeof(attr));
 838                         strlcpy(value, key_val(rule, &pair->key), sizeof(value));
 839                         udev_rules_apply_format(udev, value, sizeof(value));
 840                         info("writing '%s' to sysfs file '%s'", value, attr);
 841                         f = fopen(attr, "w");
 842                         if (f != NULL) {
 843                                 if (!udev->test_run)
 844                                         if (fprintf(f, "%s", value) <= 0)
 845                                                 err("error writing ATTR{%s}: %s", attr, strerror(errno));
 846                                 fclose(f);
 847                         } else
 848                                 err("error opening ATTR{%s} for writing: %s", attr, strerror(errno));
 849                 }
 850         }
 851         return 0;
 852
 853 nomatch:
 854         return -1;
 855 }
 856
 857 int udev_rules_get_name(struct udev_rules *rules, struct udevice *udev)
 858 {
 859         struct udev_rule *rule;
 860         int name_set = 0;
 861
 862         dbg("udev->dev->devpath='%s'", udev->dev->devpath);
 863         dbg("udev->dev->kernel='%s'", udev->dev->kernel);
 864
 865         /* look for a matching rule to apply */
 866         udev_rules_iter_init(rules);
 867         while (1) {
 868                 rule = udev_rules_iter_next(rules);
 869                 if (rule == NULL)
 870                         break;
 871
 872                 if (name_set &&
 873                     (rule->name.operation == KEY_OP_ASSIGN ||
 874                      rule->name.operation == KEY_OP_ASSIGN_FINAL ||
 875                      rule->name.operation == KEY_OP_ADD)) {
 876                         dbg("node name already set, rule ignored");
 877                         continue;
 878                 }
 879
 880                 dbg("process rule");
 881                 if (match_rule(udev, rule) == 0) {
 882                         /* apply options */
 883                         if (rule->ignore_device) {
 884                                 info("rule applied, '%s' is ignored", udev->dev->kernel);
 885                                 udev->ignore_device = 1;
 886                                 return 0;
 887                         }
 888                         if (rule->ignore_remove) {
 889                                 udev->ignore_remove = 1;
 890                                 dbg("remove event should be ignored");
 891                         }
 892                         if (rule->link_priority != 0) {
 893                                 udev->link_priority = rule->link_priority;
 894                                 info("link_priority=%i", udev->link_priority);
 895                         }
 896                         /* apply all_partitions option only at a main block device */
 897                         if (rule->partitions &&
 898                             strcmp(udev->dev->subsystem, "block") == 0 && udev->dev->kernel_number[0] == '\0') {
 899                                 udev->partitions = rule->partitions;
 900                                 dbg("creation of partition nodes requested");
 901                         }
 902
 903                         /* apply permissions */
 904                         if (!udev->mode_final && rule->mode != 0000) {
 905                                 if (rule->mode_operation == KEY_OP_ASSIGN_FINAL)
 906                                         udev->mode_final = 1;
 907                                 udev->mode = rule->mode;
 908                                 dbg("applied mode=%#o to '%s'", rule->mode, udev->dev->kernel);
 909                         }
 910                         if (!udev->owner_final && rule->owner.operation != KEY_OP_UNSET) {
 911                                 if (rule->owner.operation == KEY_OP_ASSIGN_FINAL)
 912                                         udev->owner_final = 1;
 913                                 strlcpy(udev->owner, key_val(rule, &rule->owner), sizeof(udev->owner));
 914                                 udev_rules_apply_format(udev, udev->owner, sizeof(udev->owner));
 915                                 dbg("applied owner='%s' to '%s'", udev->owner, udev->dev->kernel);
 916                         }
 917                         if (!udev->group_final && rule->group.operation != KEY_OP_UNSET) {
 918                                 if (rule->group.operation == KEY_OP_ASSIGN_FINAL)
 919                                         udev->group_final = 1;
 920                                 strlcpy(udev->group, key_val(rule, &rule->group), sizeof(udev->group));
 921                                 udev_rules_apply_format(udev, udev->group, sizeof(udev->group));
 922                                 dbg("applied group='%s' to '%s'", udev->group, udev->dev->kernel);
 923                         }
 924
 925                         /* collect symlinks */
 926                         if (!udev->symlink_final && rule->symlink.operation != KEY_OP_UNSET) {
 927                                 char temp[PATH_SIZE];
 928                                 char *pos, *next;
 929                                 int count;
 930
 931                                 if (rule->symlink.operation == KEY_OP_ASSIGN_FINAL)
 932                                         udev->symlink_final = 1;
 933                                 if (rule->symlink.operation == KEY_OP_ASSIGN || rule->symlink.operation == KEY_OP_ASSIGN_FINAL) {
 934                                         info("reset symlink list");
 935                                         name_list_cleanup(&udev->symlink_list);
 936                                 }
 937                                 /* allow  multiple symlinks separated by spaces */
 938                                 strlcpy(temp, key_val(rule, &rule->symlink), sizeof(temp));
 939                                 udev_rules_apply_format(udev, temp, sizeof(temp));
 940                                 count = replace_chars(temp, ALLOWED_CHARS_FILE " ");
 941                                 if (count)
 942                                         info("%i character(s) replaced" , count);
 943                                 dbg("rule applied, added symlink(s) '%s'", temp);
 944                                 pos = temp;
 945                                 while (isspace(pos[0]))
 946                                         pos++;
 947                                 next = strchr(pos, ' ');
 948                                 while (next) {
 949                                         next[0] = '\0';
 950                                         info("add symlink '%s'", pos);
 951                                         name_list_add(&udev->symlink_list, pos, 0);
 952                                         while (isspace(next[1]))
 953                                                 next++;
 954                                         pos = &next[1];
 955                                         next = strchr(pos, ' ');
 956                                 }
 957                                 if (pos[0] != '\0') {
 958                                         info("add symlink '%s'", pos);
 959                                         name_list_add(&udev->symlink_list, pos, 0);
 960                                 }
 961                         }
 962
 963                         /* set name, later rules with name set will be ignored */
 964                         if (rule->name.operation == KEY_OP_ASSIGN ||
 965                             rule->name.operation == KEY_OP_ASSIGN_FINAL ||
 966                             rule->name.operation == KEY_OP_ADD) {
 967                                 int count;
 968
 969                                 name_set = 1;
 970                                 strlcpy(udev->name, key_val(rule, &rule->name), sizeof(udev->name));
 971                                 udev_rules_apply_format(udev, udev->name, sizeof(udev->name));
 972                                 count = replace_chars(udev->name, ALLOWED_CHARS_FILE);
 973                                 if (count)
 974                                         info("%i character(s) replaced", count);
 975
 976                                 info("rule applied, '%s' becomes '%s'", udev->dev->kernel, udev->name);
 977                                 if (strcmp(udev->dev->subsystem, "net") != 0)
 978                                         dbg("name, '%s' is going to have owner='%s', group='%s', mode=%#o partitions=%i",
 979                                             udev->name, udev->owner, udev->group, udev->mode, udev->partitions);
 980                         }
 981
 982                         if (!udev->run_final && rule->run.operation != KEY_OP_UNSET) {
 983                                 if (rule->run.operation == KEY_OP_ASSIGN_FINAL)
 984                                         udev->run_final = 1;
 985                                 if (rule->run.operation == KEY_OP_ASSIGN || rule->run.operation == KEY_OP_ASSIGN_FINAL) {
 986                                         info("reset run list");
 987                                         name_list_cleanup(&udev->run_list);
 988                                 }
 989                                 dbg("add run '%s'", key_val(rule, &rule->run));
 990                                 name_list_add(&udev->run_list, key_val(rule, &rule->run), 0);
 991                         }
 992
 993                         if (rule->last_rule) {
 994                                 dbg("last rule to be applied");
 995                                 break;
 996                         }
 997
 998                         if (rule->goto_label.operation != KEY_OP_UNSET) {
 999                                 dbg("moving forward to label '%s'", key_val(rule, &rule->goto_label));
1000                                 udev_rules_iter_label(rules, key_val(rule, &rule->goto_label));
1001                         }
1002                 }
1003         }
1004
1005         if (!name_set) {
1006                 strlcpy(udev->name, udev->dev->kernel, sizeof(udev->name));
1007                 info("no node name set, will use kernel name '%s'", udev->name);
1008         }
1009
1010         if (udev->tmp_node[0] != '\0') {
1011                 dbg("removing temporary device node");
1012                 unlink_secure(udev->tmp_node);
1013                 udev->tmp_node[0] = '\0';
1014         }
1015
1016         return 0;
1017 }
1018
1019 int udev_rules_get_run(struct udev_rules *rules, struct udevice *udev)
1020 {
1021         struct udev_rule *rule;
1022
1023         dbg("udev->kernel='%s'", udev->dev->kernel);
1024
1025         /* look for a matching rule to apply */
1026         udev_rules_iter_init(rules);
1027         while (1) {
1028                 rule = udev_rules_iter_next(rules);
1029                 if (rule == NULL)
1030                         break;
1031
1032                 dbg("process rule");
1033                 if (rule->name.operation != KEY_OP_UNSET || rule->symlink.operation != KEY_OP_UNSET ||
1034                     rule->mode_operation != KEY_OP_UNSET || rule->owner.operation != KEY_OP_UNSET || rule->group.operation != KEY_OP_UNSET) {
1035                         dbg("skip rule that names a device");
1036                         continue;
1037                 }
1038
1039                 if (match_rule(udev, rule) == 0) {
1040                         if (rule->ignore_device) {
1041                                 info("rule applied, '%s' is ignored", udev->dev->kernel);
1042                                 udev->ignore_device = 1;
1043                                 return 0;
1044                         }
1045
1046                         if (!udev->run_final && rule->run.operation != KEY_OP_UNSET) {
1047                                 if (rule->run.operation == KEY_OP_ASSIGN || rule->run.operation == KEY_OP_ASSIGN_FINAL) {
1048                                         info("reset run list");
1049                                         name_list_cleanup(&udev->run_list);
1050                                 }
1051                                 dbg("add run '%s'", key_val(rule, &rule->run));
1052                                 name_list_add(&udev->run_list, key_val(rule, &rule->run), 0);
1053                                 if (rule->run.operation == KEY_OP_ASSIGN_FINAL)
1054                                         break;
1055                         }
1056
1057                         if (rule->last_rule) {
1058                                 dbg("last rule to be applied");
1059                                 break;
1060                         }
1061
1062                         if (rule->goto_label.operation != KEY_OP_UNSET) {
1063                                 dbg("moving forward to label '%s'", key_val(rule, &rule->goto_label));
1064                                 udev_rules_iter_label(rules, key_val(rule, &rule->goto_label));
1065                         }
1066                 }
1067         }
1068
1069         return 0;
1070 }