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