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