udev_rules.c

   1 /*
   2  * udev_rules.c
   3  *
   4  * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
   5  * Copyright (C) 2003-2005 Kay Sievers <kay.sievers@vrfy.org>
   6  *
   7  *      This program is free software; you can redistribute it and/or modify it
   8  *      under the terms of the GNU General Public License as published by the
   9  *      Free Software Foundation version 2 of the License.
  10  *
  11  *      This program is distributed in the hope that it will be useful, but
  12  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  *      General Public License for more details.
  15  *
  16  *      You should have received a copy of the GNU General Public License along
  17  *      with this program; if not, write to the Free Software Foundation, Inc.,
  18  *      675 Mass Ave, Cambridge, MA 02139, USA.
  19  *
  20  */
  21
  22 #include <stddef.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <stdio.h>
  26 #include <fcntl.h>
  27 #include <ctype.h>
  28 #include <unistd.h>
  29 #include <errno.h>
  30 #include <syslog.h>
  31 #include <sys/wait.h>
  32 #include <sys/stat.h>
  33
  34 #include "libsysfs/sysfs/libsysfs.h"
  35 #include "list.h"
  36 #include "udev_libc_wrapper.h"
  37 #include "udev.h"
  38 #include "udev_utils.h"
  39 #include "udev_version.h"
  40 #include "logging.h"
  41 #include "udev_rules.h"
  42 #include "udev_db.h"
  43
  44
  45 /* extract possible {attr} and move str behind it */
  46 static char *get_format_attribute(char **str)
  47 {
  48         char *pos;
  49         char *attr = NULL;
  50
  51         if (*str[0] == '{') {
  52                 pos = strchr(*str, '}');
  53                 if (pos == NULL) {
  54                         err("missing closing brace for format");
  55                         return NULL;
  56                 }
  57                 pos[0] = '\0';
  58                 attr = *str+1;
  59                 *str = pos+1;
  60                 dbg("attribute='%s', str='%s'", attr, *str);
  61         }
  62         return attr;
  63 }
  64
  65 /* extract possible format length and move str behind it*/
  66 static int get_format_len(char **str)
  67 {
  68         int num;
  69         char *tail;
  70
  71         if (isdigit(*str[0])) {
  72                 num = (int) strtoul(*str, &tail, 10);
  73                 if (num > 0) {
  74                         *str = tail;
  75                         dbg("format length=%i", num);
  76                         return num;
  77                 } else {
  78                         err("format parsing error '%s'", *str);
  79                 }
  80         }
  81         return -1;
  82 }
  83
  84 static int get_key(char **line, char **key, char **value)
  85 {
  86         char *linepos;
  87         char *temp;
  88
  89         linepos = *line;
  90         if (!linepos)
  91                 return -1;
  92
  93         if (strchr(linepos, '\\')) {
  94                 dbg("escaped characters are not supported, skip");
  95                 return -1;
  96         }
  97
  98         /* skip whitespace */
  99         while (isspace(linepos[0]))
 100                 linepos++;
 101
 102         /* get the key */
 103         *key = linepos;
 104         while (1) {
 105                 linepos++;
 106                 if (linepos[0] == '\0')
 107                         return -1;
 108                 if (isspace(linepos[0]))
 109                         break;
 110                 if (linepos[0] == '=')
 111                         break;
 112         }
 113
 114         /* terminate key */
 115         linepos[0] = '\0';
 116         linepos++;
 117
 118         /* skip whitespace */
 119         while (isspace(linepos[0]))
 120                 linepos++;
 121
 122         /* get the value*/
 123         if (linepos[0] == '"') {
 124                 linepos++;
 125                 temp = strchr(linepos, '"');
 126                 if (!temp) {
 127                         dbg("missing closing quote");
 128                         return -1;
 129                 }
 130                 dbg("value is quoted");
 131                 temp[0] = '\0';
 132         } else if (linepos[0] == '\'') {
 133                 linepos++;
 134                 temp = strchr(linepos, '\'');
 135                 if (!temp) {
 136                         dbg("missing closing quote");
 137                         return -1;
 138                 }
 139                 dbg("value is quoted");
 140                 temp[0] = '\0';
 141         } else if (linepos[0] == '\0') {
 142                 dbg("value is empty");
 143         } else {
 144                 temp = linepos;
 145                 while (temp[0] && !isspace(temp[0]))
 146                         temp++;
 147                 temp[0] = '\0';
 148         }
 149         *value = linepos;
 150
 151         return 0;
 152 }
 153
 154 static int import_keys_into_env(struct udevice *udev, const char *buf, size_t bufsize)
 155 {
 156         char line[LINE_SIZE];
 157         const char *bufline;
 158         char *linepos;
 159         char *variable;
 160         char *value;
 161         size_t cur;
 162         size_t count;
 163         int lineno;
 164
 165         /* loop through the whole buffer */
 166         lineno = 0;
 167         cur = 0;
 168         while (cur < bufsize) {
 169                 count = buf_get_line(buf, bufsize, cur);
 170                 bufline = &buf[cur];
 171                 cur += count+1;
 172                 lineno++;
 173
 174                 if (count >= sizeof(line)) {
 175                         err("line too long, conf line skipped %s, line %d", udev_config_filename, lineno);
 176                         continue;
 177                 }
 178
 179                 /* eat the whitespace */
 180                 while ((count > 0) && isspace(bufline[0])) {
 181                         bufline++;
 182                         count--;
 183                 }
 184                 if (count == 0)
 185                         continue;
 186
 187                 /* see if this is a comment */
 188                 if (bufline[0] == COMMENT_CHARACTER)
 189                         continue;
 190
 191                 memcpy(line, bufline, count);
 192                 line[count] = '\0';
 193
 194                 linepos = line;
 195                 if (get_key(&linepos, &variable, &value) == 0) {
 196                         dbg("import '%s=%s'", variable, value);
 197                         name_list_key_add(&udev->env_list, variable, value);
 198                         setenv(variable, value, 1);
 199                 }
 200         }
 201
 202         return 0;
 203 }
 204
 205 static int import_file_into_env(struct udevice *udev, const char *filename)
 206 {
 207         char *buf;
 208         size_t bufsize;
 209
 210         if (file_map(filename, &buf, &bufsize) != 0) {
 211                 err("can't open '%s'", filename);
 212                 return -1;
 213         }
 214         import_keys_into_env(udev, buf, bufsize);
 215         file_unmap(buf, bufsize);
 216
 217         return 0;
 218 }
 219
 220 static int import_program_into_env(struct udevice *udev, const char *program)
 221 {
 222         char result[1024];
 223         size_t reslen;
 224
 225         if (run_program(program, udev->subsystem, result, sizeof(result), &reslen, (udev_log_priority >= LOG_INFO)) != 0)
 226                 return -1;
 227         return import_keys_into_env(udev, result, reslen);
 228 }
 229
 230 static int import_parent_into_env(struct udevice *udev, struct sysfs_class_device *class_dev, const char *filter)
 231 {
 232         struct sysfs_class_device *parent = sysfs_get_classdev_parent(class_dev);
 233         int rc = -1;
 234
 235         if (parent != NULL) {
 236                 struct udevice udev_parent;
 237                 struct name_entry *name_loop;
 238
 239                 dbg("found parent '%s', get the node name", parent->path);
 240                 udev_init_device(&udev_parent, NULL, NULL, NULL);
 241                 /* import the udev_db of the parent */
 242                 if (udev_db_get_device(&udev_parent, &parent->path[strlen(sysfs_path)]) == 0) {
 243                         dbg("import stored parent env '%s'", udev_parent.name);
 244                         list_for_each_entry(name_loop, &udev_parent.env_list, node) {
 245                                 char name[NAME_SIZE];
 246                                 char *pos;
 247
 248                                 strlcpy(name, name_loop->name, sizeof(name));
 249                                 pos = strchr(name, '=');
 250                                 if (pos) {
 251                                         pos[0] = '\0';
 252                                         pos++;
 253                                         if (strcmp_pattern(filter, name) == 0) {
 254                                                 dbg("import key '%s'", name_loop->name);
 255                                                 name_list_add(&udev->env_list, name_loop->name, 0);
 256                                                 setenv(name, pos, 1);
 257                                         } else
 258                                                 dbg("skip key '%s'", name_loop->name);
 259                                 }
 260                         }
 261                         rc = 0;
 262                 } else
 263                         dbg("parent not found in database");
 264                 udev_cleanup_device(&udev_parent);
 265         }
 266
 267         return rc;
 268 }
 269
 270 /* finds the lowest positive N such that <name>N isn't present in the udevdb
 271  * if <name> doesn't exist, 0 is returned, N otherwise
 272  */
 273 static int find_free_number(const char *name)
 274 {
 275         char devpath[PATH_SIZE];
 276         char filename[PATH_SIZE];
 277         int num = 0;
 278
 279         strlcpy(filename, name, sizeof(filename));
 280         while (1) {
 281                 dbg("look for existing node '%s'", filename);
 282                 if (udev_db_search_name(devpath, sizeof(devpath), filename) != 0) {
 283                         dbg("free num=%d", num);
 284                         return num;
 285                 }
 286
 287                 num++;
 288                 if (num > 1000) {
 289                         info("find_free_number gone crazy (num=%d), aborted", num);
 290                         return -1;
 291                 }
 292                 snprintf(filename, sizeof(filename), "%s%d", name, num);
 293                 filename[sizeof(filename)-1] = '\0';
 294         }
 295 }
 296
 297 static int find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device,
 298                                 const char *name, char *value, size_t len)
 299 {
 300         struct sysfs_class_device *class_dev_parent;
 301         struct sysfs_attribute *tmpattr;
 302
 303         dbg("look for device attribute '%s'", name);
 304         if (class_dev) {
 305                 dbg("look for class attribute '%s/%s'", class_dev->path, name);
 306                 tmpattr = sysfs_get_classdev_attr(class_dev, name);
 307                 if (tmpattr)
 308                         goto attr_found;
 309                 class_dev_parent = sysfs_get_classdev_parent(class_dev);
 310                 if (class_dev_parent) {
 311                         tmpattr = sysfs_get_classdev_attr(class_dev_parent, name);
 312                         if (tmpattr)
 313                                 goto attr_found;
 314                 }
 315         }
 316         if (sysfs_device) {
 317                 dbg("look for devices attribute '%s/%s'", sysfs_device->path, name);
 318                 tmpattr = sysfs_get_device_attr(sysfs_device, name);
 319                 if (tmpattr)
 320                         goto attr_found;
 321         }
 322         return -1;
 323
 324 attr_found:
 325         strlcpy(value, tmpattr->value, len);
 326         remove_trailing_char(value, '\n');
 327
 328         dbg("found attribute '%s'", tmpattr->path);
 329         return 0;
 330 }
 331
 332 #define WAIT_LOOP_PER_SECOND                    20
 333 static int wait_for_sysfs(struct udevice *udev, const char *file, int timeout)
 334 {
 335         char filename[PATH_SIZE];
 336         struct stat stats;
 337         int loop = timeout * WAIT_LOOP_PER_SECOND;
 338
 339         snprintf(filename, sizeof(filename), "%s%s/%s", sysfs_path, udev->devpath, file);
 340         filename[sizeof(filename)-1] = '\0';
 341         dbg("wait %i sec for '%s'", timeout, filename);
 342
 343         while (--loop) {
 344                 if (stat(filename, &stats) == 0) {
 345                         dbg("file appeared after %i loops", (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
 346                         return 0;
 347                 }
 348                 usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
 349         }
 350         dbg("waiting for '%s' failed", filename);
 351         return -1;
 352 }
 353
 354 static void apply_format(struct udevice *udev, char *string, size_t maxsize,
 355                          struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 356 {
 357         char temp[PATH_SIZE];
 358         char temp2[PATH_SIZE];
 359         char *head, *tail, *pos, *cpos, *attr, *rest;
 360         int len;
 361         int i;
 362         unsigned int next_free_number;
 363         struct sysfs_class_device *class_dev_parent;
 364         enum subst_type {
 365                 SUBST_UNKNOWN,
 366                 SUBST_DEVPATH,
 367                 SUBST_ID,
 368                 SUBST_KERNEL_NUMBER,
 369                 SUBST_KERNEL_NAME,
 370                 SUBST_MAJOR,
 371                 SUBST_MINOR,
 372                 SUBST_RESULT,
 373                 SUBST_SYSFS,
 374                 SUBST_ENUM,
 375                 SUBST_PARENT,
 376                 SUBST_TEMP_NODE,
 377                 SUBST_ROOT,
 378                 SUBST_MODALIAS,
 379                 SUBST_ENV,
 380         };
 381         static const struct subst_map {
 382                 char *name;
 383                 char fmt;
 384                 enum subst_type type;
 385         } map[] = {
 386                 { .name = "devpath",            .fmt = 'p',     .type = SUBST_DEVPATH },
 387                 { .name = "id",                 .fmt = 'b',     .type = SUBST_ID },
 388                 { .name = "number",             .fmt = 'n',     .type = SUBST_KERNEL_NUMBER },
 389                 { .name = "kernel",             .fmt = 'k',     .type = SUBST_KERNEL_NAME },
 390                 { .name = "major",              .fmt = 'M',     .type = SUBST_MAJOR },
 391                 { .name = "minor",              .fmt = 'm',     .type = SUBST_MINOR },
 392                 { .name = "result",             .fmt = 'c',     .type = SUBST_RESULT },
 393                 { .name = "sysfs",              .fmt = 's',     .type = SUBST_SYSFS },
 394                 { .name = "enum",               .fmt = 'e',     .type = SUBST_ENUM },
 395                 { .name = "parent",             .fmt = 'P',     .type = SUBST_PARENT },
 396                 { .name = "tempnode",           .fmt = 'N',     .type = SUBST_TEMP_NODE },
 397                 { .name = "root",               .fmt = 'r',     .type = SUBST_ROOT },
 398                 { .name = "modalias",           .fmt = 'A',     .type = SUBST_MODALIAS },
 399                 { .name = "env",                .fmt = 'E',     .type = SUBST_ENV },
 400                 { NULL, '\0', 0 }
 401         };
 402         enum subst_type type;
 403         const struct subst_map *subst;
 404
 405         head = string;
 406         while (1) {
 407                 len = -1;
 408                 while (head[0] != '\0') {
 409                         if (head[0] == '$') {
 410                                 /* substitute named variable */
 411                                 if (head[1] == '\0')
 412                                         break;
 413                                 if (head[1] == '$') {
 414                                         strlcpy(temp, head+2, sizeof(temp));
 415                                         strlcpy(head+1, temp, maxsize);
 416                                         head++;
 417                                         continue;
 418                                 }
 419                                 head[0] = '\0';
 420                                 for (subst = map; subst->name; subst++) {
 421                                         if (strncasecmp(&head[1], subst->name, strlen(subst->name)) == 0) {
 422                                                 type = subst->type;
 423                                                 tail = head + strlen(subst->name)+1;
 424                                                 dbg("will substitute format name '%s'", subst->name);
 425                                                 goto found;
 426                                         }
 427                                 }
 428                         }
 429                         else if (head[0] == '%') {
 430                                 /* substitute format char */
 431                                 if (head[1] == '\0')
 432                                         break;
 433                                 if (head[1] == '%') {
 434                                         strlcpy(temp, head+2, sizeof(temp));
 435                                         strlcpy(head+1, temp, maxsize);
 436                                         head++;
 437                                         continue;
 438                                 }
 439                                 head[0] = '\0';
 440                                 tail = head+1;
 441                                 len = get_format_len(&tail);
 442                                 for (subst = map; subst->name; subst++) {
 443                                         if (tail[0] == subst->fmt) {
 444                                                 type = subst->type;
 445                                                 tail++;
 446                                                 dbg("will substitute format char '%c'", subst->fmt);
 447                                                 goto found;
 448                                         }
 449                                 }
 450                         }
 451                         head++;
 452                 }
 453                 break;
 454 found:
 455                 attr = get_format_attribute(&tail);
 456                 strlcpy(temp, tail, sizeof(temp));
 457                 dbg("format=%i, string='%s', tail='%s', class_dev=%p, sysfs_dev=%p",
 458                     type ,string, tail, class_dev, sysfs_device);
 459
 460                 switch (type) {
 461                 case SUBST_DEVPATH:
 462                         strlcat(string, udev->devpath, maxsize);
 463                         dbg("substitute devpath '%s'", udev->devpath);
 464                         break;
 465                 case SUBST_ID:
 466                         strlcat(string, udev->bus_id, maxsize);
 467                         dbg("substitute bus_id '%s'", udev->bus_id);
 468                         break;
 469                 case SUBST_KERNEL_NAME:
 470                         strlcat(string, udev->kernel_name, maxsize);
 471                         dbg("substitute kernel name '%s'", udev->kernel_name);
 472                         break;
 473                 case SUBST_KERNEL_NUMBER:
 474                         strlcat(string, udev->kernel_number, maxsize);
 475                         dbg("substitute kernel number '%s'", udev->kernel_number);
 476                         break;
 477                 case SUBST_MAJOR:
 478                         sprintf(temp2, "%d", major(udev->devt));
 479                         strlcat(string, temp2, maxsize);
 480                         dbg("substitute major number '%s'", temp2);
 481                         break;
 482                 case SUBST_MINOR:
 483                         sprintf(temp2, "%d", minor(udev->devt));
 484                         strlcat(string, temp2, maxsize);
 485                         dbg("substitute minor number '%s'", temp2);
 486                         break;
 487                 case SUBST_RESULT:
 488                         if (udev->program_result[0] == '\0')
 489                                 break;
 490                         /* get part part of the result string */
 491                         i = 0;
 492                         if (attr != NULL)
 493                                 i = strtoul(attr, &rest, 10);
 494                         if (i > 0) {
 495                                 dbg("request part #%d of result string", i);
 496                                 cpos = udev->program_result;
 497                                 while (--i) {
 498                                         while (cpos[0] != '\0' && !isspace(cpos[0]))
 499                                                 cpos++;
 500                                         while (isspace(cpos[0]))
 501                                                 cpos++;
 502                                 }
 503                                 if (i > 0) {
 504                                         err("requested part of result string not found");
 505                                         break;
 506                                 }
 507                                 strlcpy(temp2, cpos, sizeof(temp2));
 508                                 /* %{2+}c copies the whole string from the second part on */
 509                                 if (rest[0] != '+') {
 510                                         cpos = strchr(temp2, ' ');
 511                                         if (cpos)
 512                                                 cpos[0] = '\0';
 513                                 }
 514                                 strlcat(string, temp2, maxsize);
 515                                 dbg("substitute part of result string '%s'", temp2);
 516                         } else {
 517                                 strlcat(string, udev->program_result, maxsize);
 518                                 dbg("substitute result string '%s'", udev->program_result);
 519                         }
 520                         break;
 521                 case SUBST_SYSFS:
 522                         if (attr == NULL) {
 523                                 dbg("missing attribute");
 524                                 break;
 525                         }
 526                         if (find_sysfs_attribute(class_dev, sysfs_device, attr, temp2, sizeof(temp2)) != 0) {
 527                                 struct sysfs_device *parent_device;
 528
 529                                 dbg("sysfs attribute '%s' not found, walk up the physical devices", attr);
 530                                 parent_device = sysfs_get_device_parent(sysfs_device);
 531                                 while (parent_device) {
 532                                         dbg("looking at '%s'", parent_device->path);
 533                                         if (find_sysfs_attribute(NULL, parent_device, attr, temp2, sizeof(temp2)) == 0)
 534                                                 break;
 535                                         parent_device = sysfs_get_device_parent(parent_device);
 536                                 }
 537                                 if (!parent_device)
 538                                         break;
 539                         }
 540                         /* strip trailing whitespace of sysfs value */
 541                         i = strlen(temp2);
 542                         while (i > 0 && isspace(temp2[i-1]))
 543                                 temp2[--i] = '\0';
 544                         replace_untrusted_chars(temp2);
 545                         strlcat(string, temp2, maxsize);
 546                         dbg("substitute sysfs value '%s'", temp2);
 547                         break;
 548                 case SUBST_ENUM:
 549                         next_free_number = find_free_number(string);
 550                         if (next_free_number > 0) {
 551                                 sprintf(temp2, "%d", next_free_number);
 552                                 strlcat(string, temp2, maxsize);
 553                         }
 554                         break;
 555                 case SUBST_PARENT:
 556                         if (!class_dev)
 557                                 break;
 558                         class_dev_parent = sysfs_get_classdev_parent(class_dev);
 559                         if (class_dev_parent != NULL) {
 560                                 struct udevice udev_parent;
 561
 562                                 dbg("found parent '%s', get the node name", class_dev_parent->path);
 563                                 udev_init_device(&udev_parent, NULL, NULL, NULL);
 564                                 /* lookup the name in the udev_db with the DEVPATH of the parent */
 565                                 if (udev_db_get_device(&udev_parent, &class_dev_parent->path[strlen(sysfs_path)]) == 0) {
 566                                         strlcat(string, udev_parent.name, maxsize);
 567                                         dbg("substitute parent node name'%s'", udev_parent.name);
 568                                 } else
 569                                         dbg("parent not found in database");
 570                                 udev_cleanup_device(&udev_parent);
 571                         }
 572                         break;
 573                 case SUBST_TEMP_NODE:
 574                         if (udev->tmp_node[0] == '\0') {
 575                                 dbg("create temporary device node for callout");
 576                                 snprintf(udev->tmp_node, sizeof(udev->tmp_node), "%s/.tmp-%u-%u",
 577                                          udev_root, major(udev->devt), minor(udev->devt));
 578                                 udev->tmp_node[sizeof(udev->tmp_node)-1] = '\0';
 579                                 udev_make_node(udev, udev->tmp_node, udev->devt, 0600, 0, 0);
 580                         }
 581                         strlcat(string, udev->tmp_node, maxsize);
 582                         dbg("substitute temporary device node name '%s'", udev->tmp_node);
 583                         break;
 584                 case SUBST_ROOT:
 585                         strlcat(string, udev_root, maxsize);
 586                         dbg("substitute udev_root '%s'", udev_root);
 587                         break;
 588                 case SUBST_MODALIAS:
 589                         if (find_sysfs_attribute(NULL, sysfs_device, "modalias", temp2, sizeof(temp2)) != 0)
 590                                 break;
 591                         strlcat(string, temp2, maxsize);
 592                         dbg("substitute MODALIAS '%s'", temp2);
 593                         break;
 594                 case SUBST_ENV:
 595                         if (attr == NULL) {
 596                                 dbg("missing attribute");
 597                                 break;
 598                         }
 599                         pos = getenv(attr);
 600                         if (pos == NULL) {
 601                                 dbg("env '%s' not avialable", attr);
 602                                 break;
 603                         }
 604                         dbg("substitute env '%s=%s'", attr, pos);
 605                         strlcat(string, pos, maxsize);
 606                         break;
 607                 default:
 608                         err("unknown substitution type=%i", type);
 609                         break;
 610                 }
 611                 /* possibly truncate to format-char specified length */
 612                 if (len != -1) {
 613                         head[len] = '\0';
 614                         dbg("truncate to %i chars, subtitution string becomes '%s'", len, head);
 615                 }
 616                 strlcat(string, temp, maxsize);
 617         }
 618 }
 619
 620 static char *key_val(struct udev_rule *rule, struct key *key)
 621 {
 622         return rule->buf + key->val_off;
 623 }
 624
 625 static char *key_pair_name(struct udev_rule *rule, struct key_pair *pair)
 626 {
 627         return rule->buf + pair->key_name_off;
 628 }
 629
 630 static int match_key(const char *key_name, struct udev_rule *rule, struct key *key, const char *val)
 631 {
 632         int match;
 633         char value[PATH_SIZE];
 634         char *key_value;
 635         char *pos;
 636
 637         if (key->operation == KEY_OP_UNSET)
 638                 return 0;
 639
 640         strlcpy(value, rule->buf + key->val_off, sizeof(value));
 641         key_value = value;
 642
 643         dbg("key %s value='%s'", key_name, key_value);
 644         while (key_value) {
 645                 pos = strchr(key_value, '|');
 646                 if (pos) {
 647                         pos[0] = '\0';
 648                         pos++;
 649                 }
 650                 dbg("match %s '%s' <-> '%s'", key_name, key_value, val);
 651                 match = (strcmp_pattern(key_value, val) == 0);
 652                 if (match && (key->operation != KEY_OP_NOMATCH)) {
 653                         dbg("%s is true (matching value)", key_name);
 654                         return 0;
 655                 }
 656                 if (!match && (key->operation == KEY_OP_NOMATCH)) {
 657                         dbg("%s is true (non-matching value)", key_name);
 658                         return 0;
 659                 }
 660                 key_value = pos;
 661         }
 662         dbg("%s is false", key_name);
 663         return -1;
 664 }
 665
 666 static int match_rule(struct udevice *udev, struct udev_rule *rule,
 667                       struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 668 {
 669         struct sysfs_device *parent_device = sysfs_device;
 670         int i;
 671
 672         if (match_key("ACTION", rule, &rule->action, udev->action))
 673                 goto exit;
 674
 675         if (match_key("KERNEL", rule, &rule->kernel_name, udev->kernel_name))
 676                 goto exit;
 677
 678         if (match_key("SUBSYSTEM", rule, &rule->subsystem, udev->subsystem))
 679                 goto exit;
 680
 681         if (match_key("DEVPATH", rule, &rule->devpath, udev->devpath))
 682                 goto exit;
 683
 684         if (rule->modalias.operation != KEY_OP_UNSET) {
 685                 char value[NAME_SIZE];
 686
 687                 if (find_sysfs_attribute(NULL, sysfs_device, "modalias", value, sizeof(value)) != 0) {
 688                         dbg("MODALIAS value not found");
 689                         goto exit;
 690                 }
 691                 if (match_key("MODALIAS", rule, &rule->modalias, value))
 692                         goto exit;
 693         }
 694
 695         for (i = 0; i < rule->env.count; i++) {
 696                 struct key_pair *pair = &rule->env.keys[i];
 697
 698                 /* we only check for matches, assignments will be handled later */
 699                 if (pair->key.operation != KEY_OP_ASSIGN) {
 700                         const char *key_name = key_pair_name(rule, pair);
 701                         const char *value = getenv(key_name);
 702
 703                         if (!value) {
 704                                 dbg("ENV{'%s'} is not set, treat as empty", key_name);
 705                                 value = "";
 706                         }
 707                         if (match_key("ENV", rule, &pair->key, value))
 708                                 goto exit;
 709                 }
 710         }
 711
 712         if (rule->wait_for_sysfs.operation != KEY_OP_UNSET) {
 713                 int match;
 714
 715                 match = (wait_for_sysfs(udev, key_val(rule, &rule->wait_for_sysfs), 3) == 0);
 716                 if (match && (rule->wait_for_sysfs.operation != KEY_OP_NOMATCH)) {
 717                         dbg("WAIT_FOR_SYSFS is true (matching value)");
 718                         return 0;
 719                 }
 720                 if (!match && (rule->wait_for_sysfs.operation == KEY_OP_NOMATCH)) {
 721                         dbg("WAIT_FOR_SYSFS is true, (non matching value)");
 722                         return 0;
 723                 }
 724                 dbg("WAIT_FOR_SYSFS is false");
 725                 return -1;
 726         }
 727
 728         /* walk up the chain of physical devices and find a match */
 729         while (1) {
 730                 /* check for matching driver */
 731                 if (rule->driver.operation != KEY_OP_UNSET) {
 732                         if (parent_device == NULL) {
 733                                 dbg("device has no sysfs_device");
 734                                 goto exit;
 735                         }
 736                         if (match_key("DRIVER", rule, &rule->driver, parent_device->driver_name))
 737                                 goto try_parent;
 738                 }
 739
 740                 /* check for matching bus value */
 741                 if (rule->bus.operation != KEY_OP_UNSET) {
 742                         if (parent_device == NULL) {
 743                                 dbg("device has no sysfs_device");
 744                                 goto exit;
 745                         }
 746                         if (match_key("BUS", rule, &rule->bus, parent_device->bus))
 747                                 goto try_parent;
 748                 }
 749
 750                 /* check for matching bus id */
 751                 if (rule->id.operation != KEY_OP_UNSET) {
 752                         if (parent_device == NULL) {
 753                                 dbg("device has no sysfs_device");
 754                                 goto exit;
 755                         }
 756                         if (match_key("ID", rule, &rule->id, parent_device->bus_id))
 757                                 goto try_parent;
 758                 }
 759
 760                 /* check for matching sysfs pairs */
 761                 if (rule->sysfs.count) {
 762                         dbg("check %i SYSFS keys", rule->sysfs.count);
 763                         for (i = 0; i < rule->sysfs.count; i++) {
 764                                 struct key_pair *pair = &rule->sysfs.keys[i];
 765                                 const char *key_name = key_pair_name(rule, pair);
 766                                 const char *key_value = key_val(rule, &pair->key);
 767                                 char value[VALUE_SIZE];
 768                                 size_t len;
 769
 770                                 if (find_sysfs_attribute(class_dev, parent_device, key_name, value, sizeof(value)) != 0)
 771                                         goto try_parent;
 772
 773                                 /* strip trailing whitespace of value, if not asked to match for it */
 774                                 len = strlen(key_value);
 775                                 if (len && !isspace(key_value[len-1])) {
 776                                         len = strlen(value);
 777                                         while (len > 0 && isspace(value[len-1]))
 778                                                 value[--len] = '\0';
 779                                         dbg("removed %zi trailing whitespace chars from '%s'", strlen(value)-len, value);
 780                                 }
 781
 782                                 if (match_key("SYSFS", rule, &pair->key, value))
 783                                         goto try_parent;
 784                         }
 785                         dbg("all %i SYSFS keys matched", rule->sysfs.count);
 786                 }
 787
 788                 /* found matching physical device  */
 789                 break;
 790 try_parent:
 791                 dbg("try parent sysfs device");
 792                 parent_device = sysfs_get_device_parent(parent_device);
 793                 if (parent_device == NULL)
 794                         goto exit;
 795                 dbg("look at sysfs_device->path='%s'", parent_device->path);
 796                 dbg("look at sysfs_device->bus_id='%s'", parent_device->bus_id);
 797         }
 798
 799         /* execute external program */
 800         if (rule->program.operation != KEY_OP_UNSET) {
 801                 char program[PATH_SIZE];
 802                 char result[PATH_SIZE];
 803
 804                 strlcpy(program, key_val(rule, &rule->program), sizeof(program));
 805                 apply_format(udev, program, sizeof(program), class_dev, sysfs_device);
 806                 if (run_program(program, udev->subsystem, result, sizeof(result), NULL, (udev_log_priority >= LOG_INFO)) != 0) {
 807                         dbg("PROGRAM is false");
 808                         udev->program_result[0] = '\0';
 809                         if (rule->program.operation != KEY_OP_NOMATCH)
 810                                 goto exit;
 811                 } else {
 812                         dbg("PROGRAM matches");
 813                         remove_trailing_char(result, '\n');
 814                         replace_untrusted_chars(result);
 815                         dbg("result is '%s'", result);
 816                         strlcpy(udev->program_result, result, sizeof(udev->program_result));
 817                         dbg("PROGRAM returned successful");
 818                         if (rule->program.operation == KEY_OP_NOMATCH)
 819                                 goto exit;
 820                 }
 821                 dbg("PROGRAM key is true");
 822         }
 823
 824         /* check for matching result of external program */
 825         if (match_key("RESULT", rule, &rule->result, udev->program_result))
 826                 goto exit;
 827
 828         /* import variables returned from program or or file into environment */
 829         if (rule->import.operation != KEY_OP_UNSET) {
 830                 char import[PATH_SIZE];
 831                 int rc = -1;
 832
 833                 strlcpy(import, key_val(rule, &rule->import), sizeof(import));
 834                 apply_format(udev, import, sizeof(import), class_dev, sysfs_device);
 835                 dbg("check for IMPORT import='%s'", import);
 836                 if (rule->import_type == IMPORT_PROGRAM) {
 837                         rc = import_program_into_env(udev, import);
 838                 } else if (rule->import_type == IMPORT_FILE) {
 839                         dbg("import file import='%s'", import);
 840                         rc = import_file_into_env(udev, import);
 841                 } else if (rule->import_type == IMPORT_PARENT && class_dev) {
 842                         dbg("import parent import='%s'", import);
 843                         rc = import_parent_into_env(udev, class_dev, import);
 844                 }
 845                 if (rc) {
 846                         dbg("IMPORT failed");
 847                         if (rule->import.operation != KEY_OP_NOMATCH)
 848                                 goto exit;
 849                 } else
 850                         dbg("IMPORT '%s' imported", key_val(rule, &rule->import));
 851                 dbg("IMPORT key is true");
 852         }
 853
 854         /* rule matches, if we have ENV assignments export it */
 855         for (i = 0; i < rule->env.count; i++) {
 856                 struct key_pair *pair = &rule->env.keys[i];
 857
 858                 if (pair->key.operation == KEY_OP_ASSIGN) {
 859                         const char *key_name = key_pair_name(rule, pair);
 860                         const char *value = key_val(rule, &pair->key);
 861
 862                         setenv(key_name, value, 1);
 863                         dbg("export ENV '%s=%s'", key_name, value);
 864                 }
 865         }
 866
 867         return 0;
 868
 869 exit:
 870         return -1;
 871 }
 872
 873 int udev_rules_get_name(struct udev_rules *rules, struct udevice *udev, struct sysfs_class_device *class_dev)
 874 {
 875         struct sysfs_class_device *class_dev_parent;
 876         struct sysfs_device *sysfs_device = NULL;
 877         struct udev_rule *rule;
 878         int name_set = 0;
 879
 880         dbg("class_dev->name='%s'", class_dev->name);
 881
 882         /* Figure out where the "device"-symlink is at.  For char devices this will
 883          * always be in the class_dev->path.  On block devices, only the main block
 884          * device will have the device symlink in it's path. All partition devices
 885          * need to look at the symlink in its parent directory.
 886          */
 887         class_dev_parent = sysfs_get_classdev_parent(class_dev);
 888         if (class_dev_parent != NULL) {
 889                 dbg("given class device has a parent, use this instead");
 890                 sysfs_device = sysfs_get_classdev_device(class_dev_parent);
 891         } else {
 892                 sysfs_device = sysfs_get_classdev_device(class_dev);
 893         }
 894
 895         if (sysfs_device) {
 896                 dbg("found devices device: path='%s', bus_id='%s', bus='%s'",
 897                     sysfs_device->path, sysfs_device->bus_id, sysfs_device->bus);
 898                 strlcpy(udev->bus_id, sysfs_device->bus_id, sizeof(udev->bus_id));
 899         }
 900
 901         dbg("udev->kernel_name='%s'", udev->kernel_name);
 902
 903         /* look for a matching rule to apply */
 904         udev_rules_iter_init(rules);
 905         while (1) {
 906                 rule = udev_rules_iter_next(rules);
 907                 if (rule == NULL)
 908                         break;
 909
 910                 if (name_set && rule->name.operation != KEY_OP_UNSET) {
 911                         dbg("node name already set, rule ignored");
 912                         continue;
 913                 }
 914
 915                 dbg("process rule");
 916                 if (match_rule(udev, rule, class_dev, sysfs_device) == 0) {
 917                         /* apply options */
 918                         if (rule->ignore_device) {
 919                                 info("rule applied, '%s' is ignored", udev->kernel_name);
 920                                 udev->ignore_device = 1;
 921                                 return 0;
 922                         }
 923                         if (rule->ignore_remove) {
 924                                 udev->ignore_remove = 1;
 925                                 dbg("remove event should be ignored");
 926                         }
 927                         /* apply all_partitions option only at a main block device */
 928                         if (rule->partitions && udev->type == DEV_BLOCK && udev->kernel_number[0] == '\0') {
 929                                 udev->partitions = rule->partitions;
 930                                 dbg("creation of partition nodes requested");
 931                         }
 932
 933                         /* apply permissions */
 934                         if (!udev->mode_final && rule->mode != 0000) {
 935                                 if (rule->mode_operation == KEY_OP_ASSIGN_FINAL)
 936                                         udev->mode_final = 1;
 937                                 udev->mode = rule->mode;
 938                                 dbg("applied mode=%#o to '%s'", rule->mode, udev->kernel_name);
 939                         }
 940                         if (!udev->owner_final && rule->owner.operation != KEY_OP_UNSET) {
 941                                 if (rule->owner.operation == KEY_OP_ASSIGN_FINAL)
 942                                         udev->owner_final = 1;
 943                                 strlcpy(udev->owner, key_val(rule, &rule->owner), sizeof(udev->owner));
 944                                 apply_format(udev, udev->owner, sizeof(udev->owner), class_dev, sysfs_device);
 945                                 dbg("applied owner='%s' to '%s'", udev->owner, udev->kernel_name);
 946                         }
 947                         if (!udev->group_final && rule->group.operation != KEY_OP_UNSET) {
 948                                 if (rule->group.operation == KEY_OP_ASSIGN_FINAL)
 949                                         udev->group_final = 1;
 950                                 strlcpy(udev->group, key_val(rule, &rule->group), sizeof(udev->group));
 951                                 apply_format(udev, udev->group, sizeof(udev->group), class_dev, sysfs_device);
 952                                 dbg("applied group='%s' to '%s'", udev->group, udev->kernel_name);
 953                         }
 954
 955                         /* collect symlinks */
 956                         if (!udev->symlink_final && rule->symlink.operation != KEY_OP_UNSET) {
 957                                 char temp[PATH_SIZE];
 958                                 char *pos, *next;
 959
 960                                 if (rule->symlink.operation == KEY_OP_ASSIGN_FINAL)
 961                                         udev->symlink_final = 1;
 962                                 if (rule->symlink.operation == KEY_OP_ASSIGN || rule->symlink.operation == KEY_OP_ASSIGN_FINAL) {
 963                                         struct name_entry *name_loop;
 964                                         struct name_entry *temp_loop;
 965
 966                                         info("reset symlink list");
 967                                         list_for_each_entry_safe(name_loop, temp_loop, &udev->symlink_list, node) {
 968                                                 list_del(&name_loop->node);
 969                                                 free(name_loop);
 970                                         }
 971                                 }
 972                                 strlcpy(temp, key_val(rule, &rule->symlink), sizeof(temp));
 973                                 apply_format(udev, temp, sizeof(temp), class_dev, sysfs_device);
 974                                 dbg("rule applied, added symlink '%s'", temp);
 975
 976                                 /* add multiple symlinks separated by spaces */
 977                                 pos = temp;
 978                                 while (isspace(pos[0]))
 979                                         pos++;
 980                                 next = strchr(pos, ' ');
 981                                 while (next) {
 982                                         next[0] = '\0';
 983                                         info("add symlink '%s'", pos);
 984                                         name_list_add(&udev->symlink_list, pos, 0);
 985                                         while (isspace(next[1]))
 986                                                 next++;
 987                                         pos = &next[1];
 988                                         next = strchr(pos, ' ');
 989                                 }
 990                                 if (pos[0] != '\0') {
 991                                         info("add symlink '%s'", pos);
 992                                         name_list_add(&udev->symlink_list, pos, 0);
 993                                 }
 994                         }
 995
 996                         /* set name, later rules with name set will be ignored */
 997                         if (rule->name.operation != KEY_OP_UNSET) {
 998                                 name_set = 1;
 999                                 strlcpy(udev->name, key_val(rule, &rule->name), sizeof(udev->name));
1000                                 apply_format(udev, udev->name, sizeof(udev->name), class_dev, sysfs_device);
1001
1002                                 info("rule applied, '%s' becomes '%s'", udev->kernel_name, udev->name);
1003                                 if (udev->type != DEV_NET)
1004                                         dbg("name, '%s' is going to have owner='%s', group='%s', mode=%#o partitions=%i",
1005                                             udev->name, udev->owner, udev->group, udev->mode, udev->partitions);
1006                         }
1007
1008                         if (!udev->run_final && rule->run.operation != KEY_OP_UNSET) {
1009                                 char program[PATH_SIZE];
1010
1011                                 if (rule->run.operation == KEY_OP_ASSIGN_FINAL)
1012                                         udev->run_final = 1;
1013                                 if (rule->run.operation == KEY_OP_ASSIGN || rule->run.operation == KEY_OP_ASSIGN_FINAL) {
1014                                         struct name_entry *name_loop;
1015                                         struct name_entry *temp_loop;
1016
1017                                         info("reset run list");
1018                                         list_for_each_entry_safe(name_loop, temp_loop, &udev->run_list, node) {
1019                                                 list_del(&name_loop->node);
1020                                                 free(name_loop);
1021                                         }
1022                                 }
1023                                 strlcpy(program, key_val(rule, &rule->run), sizeof(program));
1024                                 apply_format(udev, program, sizeof(program), class_dev, sysfs_device);
1025                                 dbg("add run '%s'", program);
1026                                 name_list_add(&udev->run_list, program, 0);
1027                         }
1028
1029                         if (rule->last_rule) {
1030                                 dbg("last rule to be applied");
1031                                 break;
1032                         }
1033
1034                         if (rule->goto_label.operation != KEY_OP_UNSET) {
1035                                 dbg("moving forward to label '%s'", key_val(rule, &rule->goto_label));
1036                                 udev_rules_iter_label(rules, key_val(rule, &rule->goto_label));
1037                         }
1038                 }
1039         }
1040
1041         if (!name_set) {
1042                 strlcpy(udev->name, udev->kernel_name, sizeof(udev->name));
1043                 info("no node name set, will use kernel name '%s'", udev->name);
1044         }
1045
1046         if (udev->tmp_node[0] != '\0') {
1047                 dbg("removing temporary device node");
1048                 unlink_secure(udev->tmp_node);
1049                 udev->tmp_node[0] = '\0';
1050         }
1051
1052         return 0;
1053 }
1054
1055 int udev_rules_get_run(struct udev_rules *rules, struct udevice *udev,
1056                        struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_dev)
1057 {
1058         struct udev_rule *rule;
1059
1060         if (class_dev && !sysfs_dev)
1061                 sysfs_dev = sysfs_get_classdev_device(class_dev);
1062         if (sysfs_dev) {
1063                 dbg("found devices device: path='%s', bus_id='%s', bus='%s'",
1064                     sysfs_dev->path, sysfs_dev->bus_id, sysfs_dev->bus);
1065                 strlcpy(udev->bus_id, sysfs_dev->bus_id, sizeof(udev->bus_id));
1066         }
1067
1068         dbg("udev->kernel_name='%s'", udev->kernel_name);
1069
1070         /* look for a matching rule to apply */
1071         udev_rules_iter_init(rules);
1072         while (1) {
1073                 rule = udev_rules_iter_next(rules);
1074                 if (rule == NULL)
1075                         break;
1076
1077                 dbg("process rule");
1078                 if (rule->name.operation != KEY_OP_UNSET || rule->symlink.operation != KEY_OP_UNSET ||
1079                     rule->mode_operation != KEY_OP_UNSET || rule->owner.operation != KEY_OP_UNSET || rule->group.operation != KEY_OP_UNSET) {
1080                         dbg("skip rule that names a device");
1081                         continue;
1082                 }
1083
1084                 if (match_rule(udev, rule, class_dev, sysfs_dev) == 0) {
1085                         if (rule->ignore_device) {
1086                                 info("rule applied, '%s' is ignored", udev->kernel_name);
1087                                 udev->ignore_device = 1;
1088                                 return 0;
1089                         }
1090
1091                         if (!udev->run_final && rule->run.operation != KEY_OP_UNSET) {
1092                                 char program[PATH_SIZE];
1093
1094                                 if (rule->run.operation == KEY_OP_ASSIGN || rule->run.operation == KEY_OP_ASSIGN_FINAL) {
1095                                         struct name_entry *name_loop;
1096                                         struct name_entry *temp_loop;
1097
1098                                         info("reset run list");
1099                                         list_for_each_entry_safe(name_loop, temp_loop, &udev->run_list, node) {
1100                                                 list_del(&name_loop->node);
1101                                                 free(name_loop);
1102                                         }
1103                                 }
1104                                 strlcpy(program, key_val(rule, &rule->run), sizeof(program));
1105                                 apply_format(udev, program, sizeof(program), class_dev, sysfs_dev);
1106                                 dbg("add run '%s'", program);
1107                                 name_list_add(&udev->run_list, program, 0);
1108                                 if (rule->run.operation == KEY_OP_ASSIGN_FINAL)
1109                                         break;
1110                         }
1111
1112                         if (rule->last_rule) {
1113                                 dbg("last rule to be applied");
1114                                 break;
1115                         }
1116
1117                         if (rule->goto_label.operation != KEY_OP_UNSET) {
1118                                 dbg("moving forward to label '%s'", key_val(rule, &rule->goto_label));
1119                                 udev_rules_iter_label(rules, key_val(rule, &rule->goto_label));
1120                         }
1121                 }
1122         }
1123
1124         return 0;
1125 }