udev_rules.c

   1 /*
   2  * udev_rules.c
   3  *
   4  * Userspace devfs
   5  *
   6  * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
   7  * Copyright (C) 2003-2005 Kay Sievers <kay.sievers@vrfy.org>
   8  *
   9  *
  10  *      This program is free software; you can redistribute it and/or modify it
  11  *      under the terms of the GNU General Public License as published by the
  12  *      Free Software Foundation version 2 of the License.
  13  *
  14  *      This program is distributed in the hope that it will be useful, but
  15  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *      General Public License for more details.
  18  *
  19  *      You should have received a copy of the GNU General Public License along
  20  *      with this program; if not, write to the Free Software Foundation, Inc.,
  21  *      675 Mass Ave, Cambridge, MA 02139, USA.
  22  *
  23  */
  24
  25 #include <stddef.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <stdio.h>
  29 #include <fcntl.h>
  30 #include <ctype.h>
  31 #include <unistd.h>
  32 #include <errno.h>
  33 #include <sys/wait.h>
  34
  35 #include "libsysfs/sysfs/libsysfs.h"
  36 #include "list.h"
  37 #include "udev_libc_wrapper.h"
  38 #include "udev.h"
  39 #include "udev_utils.h"
  40 #include "udev_version.h"
  41 #include "logging.h"
  42 #include "udev_rules.h"
  43 #include "udev_db.h"
  44
  45
  46 /* compare string with pattern (supports * ? [0-9] [!A-Z]) */
  47 static int strcmp_pattern(const char *p, const char *s)
  48 {
  49         if (s[0] == '\0') {
  50                 while (p[0] == '*')
  51                         p++;
  52                 return (p[0] != '\0');
  53         }
  54         switch (p[0]) {
  55         case '[':
  56                 {
  57                         int not = 0;
  58                         p++;
  59                         if (p[0] == '!') {
  60                                 not = 1;
  61                                 p++;
  62                         }
  63                         while ((p[0] != '\0') && (p[0] != ']')) {
  64                                 int match = 0;
  65                                 if (p[1] == '-') {
  66                                         if ((s[0] >= p[0]) && (s[0] <= p[2]))
  67                                                 match = 1;
  68                                         p += 3;
  69                                 } else {
  70                                         match = (p[0] == s[0]);
  71                                         p++;
  72                                 }
  73                                 if (match ^ not) {
  74                                         while ((p[0] != '\0') && (p[0] != ']'))
  75                                                 p++;
  76                                         if (p[0] == ']')
  77                                                 return strcmp_pattern(p+1, s+1);
  78                                 }
  79                         }
  80                 }
  81                 break;
  82         case '*':
  83                 if (strcmp_pattern(p, s+1))
  84                         return strcmp_pattern(p+1, s);
  85                 return 0;
  86         case '\0':
  87                 if (s[0] == '\0') {
  88                         return 0;
  89                 }
  90                 break;
  91         default:
  92                 if ((p[0] == s[0]) || (p[0] == '?'))
  93                         return strcmp_pattern(p+1, s+1);
  94                 break;
  95         }
  96         return 1;
  97 }
  98
  99 /* extract possible {attr} and move str behind it */
 100 static char *get_format_attribute(char **str)
 101 {
 102         char *pos;
 103         char *attr = NULL;
 104
 105         if (*str[0] == '{') {
 106                 pos = strchr(*str, '}');
 107                 if (pos == NULL) {
 108                         err("missing closing brace for format");
 109                         return NULL;
 110                 }
 111                 pos[0] = '\0';
 112                 attr = *str+1;
 113                 *str = pos+1;
 114                 dbg("attribute='%s', str='%s'", attr, *str);
 115         }
 116         return attr;
 117 }
 118
 119 /* extract possible format length and move str behind it*/
 120 static int get_format_len(char **str)
 121 {
 122         int num;
 123         char *tail;
 124
 125         if (isdigit(*str[0])) {
 126                 num = (int) strtoul(*str, &tail, 10);
 127                 if (num > 0) {
 128                         *str = tail;
 129                         dbg("format length=%i", num);
 130                         return num;
 131                 } else {
 132                         err("format parsing error '%s'", *str);
 133                 }
 134         }
 135         return -1;
 136 }
 137
 138 static int get_key(char **line, char **key, char **value)
 139 {
 140         char *linepos;
 141         char *temp;
 142
 143         linepos = *line;
 144         if (!linepos)
 145                 return -1;
 146
 147         if (strchr(linepos, '\\')) {
 148                 dbg("escaped characters are not supported, skip");
 149                 return -1;
 150         }
 151
 152         /* skip whitespace */
 153         while (isspace(linepos[0]))
 154                 linepos++;
 155
 156         /* get the key */
 157         *key = linepos;
 158         while (1) {
 159                 linepos++;
 160                 if (linepos[0] == '\0')
 161                         return -1;
 162                 if (isspace(linepos[0]))
 163                         break;
 164                 if (linepos[0] == '=')
 165                         break;
 166         }
 167
 168         /* terminate key */
 169         linepos[0] = '\0';
 170         linepos++;
 171
 172         /* skip whitespace */
 173         while (isspace(linepos[0]))
 174                 linepos++;
 175
 176         /* get the value*/
 177         if (linepos[0] == '\0')
 178                 return -1;
 179
 180         if (linepos[0] == '"') {
 181                 linepos++;
 182                 temp = strchr(linepos, '"');
 183                 if (!temp)
 184                         return -1;
 185                 temp[0] = '\0';
 186         } else if (linepos[0] == '\'') {
 187                 linepos++;
 188                 temp = strchr(linepos, '\'');
 189                 if (!temp)
 190                         return -1;
 191                 temp[0] = '\0';
 192         } else {
 193                 temp = linepos;
 194                 while (temp[0] && !isspace(temp[0]))
 195                         temp++;
 196                 temp[0] = '\0';
 197         }
 198         *value = linepos;
 199
 200         return 0;
 201 }
 202
 203 static int import_file_into_env(const char *filename)
 204 {
 205         char line[LINE_SIZE];
 206         char *bufline;
 207         char *linepos;
 208         char *variable;
 209         char *value;
 210         char *buf;
 211         size_t bufsize;
 212         size_t cur;
 213         size_t count;
 214         int lineno;
 215         int retval = 0;
 216
 217         if (file_map(filename, &buf, &bufsize) != 0) {
 218                 err("can't open '%s'", filename);
 219                 return -1;
 220         }
 221
 222         /* loop through the whole file */
 223         lineno = 0;
 224         cur = 0;
 225         while (cur < bufsize) {
 226                 count = buf_get_line(buf, bufsize, cur);
 227                 bufline = &buf[cur];
 228                 cur += count+1;
 229                 lineno++;
 230
 231                 if (count >= sizeof(line)) {
 232                         err("line too long, conf line skipped %s, line %d", udev_config_filename, lineno);
 233                         continue;
 234                 }
 235
 236                 /* eat the whitespace */
 237                 while ((count > 0) && isspace(bufline[0])) {
 238                         bufline++;
 239                         count--;
 240                 }
 241                 if (count == 0)
 242                         continue;
 243
 244                 /* see if this is a comment */
 245                 if (bufline[0] == COMMENT_CHARACTER)
 246                         continue;
 247
 248                 strlcpy(line, bufline, count+1);
 249
 250                 linepos = line;
 251                 if (get_key(&linepos, &variable, &value) == 0) {
 252                         dbg("import %s=%s", variable, value);
 253                         setenv(variable, value, 0);
 254                 }
 255         }
 256
 257         file_unmap(buf, bufsize);
 258         return retval;
 259 }
 260
 261 /** Finds the lowest positive N such that <name>N isn't present in
 262  *  $(udevroot) either as a file or a symlink.
 263  *
 264  *  @param  name                Name to check for
 265  *  @return                     0 if <name> didn't exist and N otherwise.
 266  */
 267 static int find_free_number(struct udevice *udev, const char *name)
 268 {
 269         char devpath[PATH_SIZE];
 270         char filename[PATH_SIZE];
 271         int num = 0;
 272
 273         strlcpy(filename, name, sizeof(filename));
 274         while (1) {
 275                 dbg("look for existing node '%s'", filename);
 276                 if (udev_db_search_name(devpath, sizeof(devpath), filename) != 0) {
 277                         dbg("free num=%d", num);
 278                         return num;
 279                 }
 280
 281                 num++;
 282                 if (num > 1000) {
 283                         info("find_free_number gone crazy (num=%d), aborted", num);
 284                         return -1;
 285                 }
 286                 snprintf(filename, sizeof(filename), "%s%d", name, num);
 287                 filename[sizeof(filename)-1] = '\0';
 288         }
 289 }
 290
 291 static int find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device,
 292                                 const char *name, char *value, size_t len)
 293 {
 294         struct sysfs_attribute *tmpattr;
 295
 296         dbg("look for device attribute '%s'", name);
 297         if (class_dev) {
 298                 dbg("look for class attribute '%s/%s'", class_dev->path, name);
 299                 tmpattr = sysfs_get_classdev_attr(class_dev, name);
 300                 if (tmpattr)
 301                         goto attr_found;
 302         }
 303         if (sysfs_device) {
 304                 dbg("look for devices attribute '%s/%s'", sysfs_device->path, name);
 305                 tmpattr = sysfs_get_device_attr(sysfs_device, name);
 306                 if (tmpattr)
 307                         goto attr_found;
 308         }
 309         return -1;
 310
 311 attr_found:
 312         strlcpy(value, tmpattr->value, len);
 313         remove_trailing_char(value, '\n');
 314
 315         dbg("found attribute '%s'", tmpattr->path);
 316         return 0;
 317 }
 318
 319 static void apply_format(struct udevice *udev, char *string, size_t maxsize,
 320                          struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 321 {
 322         char temp[PATH_SIZE];
 323         char temp2[PATH_SIZE];
 324         char *head, *tail, *pos, *cpos, *attr, *rest;
 325         int len;
 326         int i;
 327         unsigned int next_free_number;
 328         struct sysfs_class_device *class_dev_parent;
 329         enum subst_type {
 330                 SUBST_UNKNOWN,
 331                 SUBST_DEVPATH,
 332                 SUBST_ID,
 333                 SUBST_KERNEL_NUMBER,
 334                 SUBST_KERNEL_NAME,
 335                 SUBST_MAJOR,
 336                 SUBST_MINOR,
 337                 SUBST_RESULT,
 338                 SUBST_SYSFS,
 339                 SUBST_ENUM,
 340                 SUBST_PARENT,
 341                 SUBST_TEMP_NODE,
 342                 SUBST_ROOT,
 343                 SUBST_MODALIAS,
 344                 SUBST_ENV,
 345         };
 346         static const struct subst_map {
 347                 char *name;
 348                 char fmt;
 349                 enum subst_type type;
 350         } map[] = {
 351                 { .name = "devpath",            .fmt = 'p',     .type = SUBST_DEVPATH },
 352                 { .name = "id",                 .fmt = 'b',     .type = SUBST_ID },
 353                 { .name = "number",             .fmt = 'n',     .type = SUBST_KERNEL_NUMBER },
 354                 { .name = "kernel",             .fmt = 'k',     .type = SUBST_KERNEL_NAME },
 355                 { .name = "major",              .fmt = 'M',     .type = SUBST_MAJOR },
 356                 { .name = "minor",              .fmt = 'm',     .type = SUBST_MINOR },
 357                 { .name = "result",             .fmt = 'c',     .type = SUBST_RESULT },
 358                 { .name = "sysfs",              .fmt = 's',     .type = SUBST_SYSFS },
 359                 { .name = "enum",               .fmt = 'e',     .type = SUBST_ENUM },
 360                 { .name = "parent",             .fmt = 'P',     .type = SUBST_PARENT },
 361                 { .name = "tempnode",           .fmt = 'N',     .type = SUBST_TEMP_NODE },
 362                 { .name = "root",               .fmt = 'r',     .type = SUBST_ROOT },
 363                 { .name = "modalias",           .fmt = 'A',     .type = SUBST_MODALIAS },
 364                 { .name = "env",                .fmt = 'E',     .type = SUBST_ENV },
 365                 {}
 366         };
 367         enum subst_type type;
 368         const struct subst_map *subst;
 369
 370         head = string;
 371         while (1) {
 372                 len = -1;
 373                 while (head[0] != '\0') {
 374                         if (head[0] == '$') {
 375                                 /* substitute named variable */
 376                                 if (head[1] == '\0')
 377                                         break;
 378                                 if (head[1] == '$') {
 379                                         strlcpy(temp, head+2, sizeof(temp));
 380                                         strlcpy(head+1, temp, maxsize);
 381                                         head++;
 382                                         continue;
 383                                 }
 384                                 head[0] = '\0';
 385                                 for (subst = map; subst->name; subst++) {
 386                                         if (strncasecmp(&head[1], subst->name, strlen(subst->name)) == 0) {
 387                                                 type = subst->type;
 388                                                 tail = head + strlen(subst->name)+1;
 389                                                 dbg("will substitute format name '%s'", subst->name);
 390                                                 goto found;
 391                                         }
 392                                 }
 393                         }
 394                         else if (head[0] == '%') {
 395                                 /* substitute format char */
 396                                 if (head[1] == '\0')
 397                                         break;
 398                                 if (head[1] == '%') {
 399                                         strlcpy(temp, head+2, sizeof(temp));
 400                                         strlcpy(head+1, temp, maxsize);
 401                                         head++;
 402                                         continue;
 403                                 }
 404                                 head[0] = '\0';
 405                                 tail = head+1;
 406                                 len = get_format_len(&tail);
 407                                 for (subst = map; subst->name; subst++) {
 408                                         if (tail[0] == subst->fmt) {
 409                                                 type = subst->type;
 410                                                 tail++;
 411                                                 dbg("will substitute format char '%c'", subst->fmt);
 412                                                 goto found;
 413                                         }
 414                                 }
 415                         }
 416                         head++;
 417                 }
 418                 break;
 419 found:
 420                 attr = get_format_attribute(&tail);
 421                 strlcpy(temp, tail, sizeof(temp));
 422                 dbg("format=%i, string='%s', tail='%s', class_dev=%p, sysfs_dev=%p",
 423                     type ,string, tail, class_dev, sysfs_device);
 424
 425                 switch (type) {
 426                 case SUBST_DEVPATH:
 427                         strlcat(string, udev->devpath, maxsize);
 428                         dbg("substitute devpath '%s'", udev->devpath);
 429                         break;
 430                 case SUBST_ID:
 431                         strlcat(string, udev->bus_id, maxsize);
 432                         dbg("substitute bus_id '%s'", udev->bus_id);
 433                         break;
 434                 case SUBST_KERNEL_NAME:
 435                         strlcat(string, udev->kernel_name, maxsize);
 436                         dbg("substitute kernel name '%s'", udev->kernel_name);
 437                         break;
 438                 case SUBST_KERNEL_NUMBER:
 439                         strlcat(string, udev->kernel_number, maxsize);
 440                         dbg("substitute kernel number '%s'", udev->kernel_number);
 441                         break;
 442                 case SUBST_MAJOR:
 443                         sprintf(temp2, "%d", major(udev->devt));
 444                         strlcat(string, temp2, maxsize);
 445                         dbg("substitute major number '%s'", temp2);
 446                         break;
 447                 case SUBST_MINOR:
 448                         sprintf(temp2, "%d", minor(udev->devt));
 449                         strlcat(string, temp2, maxsize);
 450                         dbg("substitute minor number '%s'", temp2);
 451                         break;
 452                 case SUBST_RESULT:
 453                         if (udev->program_result[0] == '\0')
 454                                 break;
 455                         /* get part part of the result string */
 456                         i = 0;
 457                         if (attr != NULL)
 458                                 i = strtoul(attr, &rest, 10);
 459                         if (i > 0) {
 460                                 dbg("request part #%d of result string", i);
 461                                 cpos = udev->program_result;
 462                                 while (--i) {
 463                                         while (cpos[0] != '\0' && !isspace(cpos[0]))
 464                                                 cpos++;
 465                                         while (isspace(cpos[0]))
 466                                                 cpos++;
 467                                 }
 468                                 if (i > 0) {
 469                                         err("requested part of result string not found");
 470                                         break;
 471                                 }
 472                                 strlcpy(temp2, cpos, sizeof(temp2));
 473                                 /* %{2+}c copies the whole string from the second part on */
 474                                 if (rest[0] != '+') {
 475                                         cpos = strchr(temp2, ' ');
 476                                         if (cpos)
 477                                                 cpos[0] = '\0';
 478                                 }
 479                                 strlcat(string, temp2, maxsize);
 480                                 dbg("substitute part of result string '%s'", temp2);
 481                         } else {
 482                                 strlcat(string, udev->program_result, maxsize);
 483                                 dbg("substitute result string '%s'", udev->program_result);
 484                         }
 485                         break;
 486                 case SUBST_SYSFS:
 487                         if (attr == NULL) {
 488                                 dbg("missing attribute");
 489                                 break;
 490                         }
 491                         if (find_sysfs_attribute(class_dev, sysfs_device, attr, temp2, sizeof(temp2)) != 0) {
 492                                 struct sysfs_device *parent_device;
 493
 494                                 dbg("sysfs attribute '%s' not found, walk up the physical devices", attr);
 495                                 parent_device = sysfs_get_device_parent(sysfs_device);
 496                                 while (parent_device) {
 497                                         dbg("looking at '%s'", parent_device->path);
 498                                         if (find_sysfs_attribute(NULL, parent_device, attr, temp2, sizeof(temp2)) == 0)
 499                                                 break;
 500                                         parent_device = sysfs_get_device_parent(parent_device);
 501                                 }
 502                                 if (!parent_device)
 503                                         break;
 504                         }
 505                         /* strip trailing whitespace of sysfs value */
 506                         i = strlen(temp2);
 507                         while (i > 0 && isspace(temp2[i-1]))
 508                                 temp2[--i] = '\0';
 509                         replace_untrusted_chars(temp2);
 510                         strlcat(string, temp2, maxsize);
 511                         dbg("substitute sysfs value '%s'", temp2);
 512                         break;
 513                 case SUBST_ENUM:
 514                         next_free_number = find_free_number(udev, string);
 515                         if (next_free_number > 0) {
 516                                 sprintf(temp2, "%d", next_free_number);
 517                                 strlcat(string, temp2, maxsize);
 518                         }
 519                         break;
 520                 case SUBST_PARENT:
 521                         if (!class_dev)
 522                                 break;
 523                         class_dev_parent = sysfs_get_classdev_parent(class_dev);
 524                         if (class_dev_parent != NULL) {
 525                                 struct udevice udev_parent;
 526
 527                                 dbg("found parent '%s', get the node name", class_dev_parent->path);
 528                                 udev_init_device(&udev_parent, NULL, NULL, NULL);
 529                                 /* lookup the name in the udev_db with the DEVPATH of the parent */
 530                                 if (udev_db_get_device(&udev_parent, &class_dev_parent->path[strlen(sysfs_path)]) == 0) {
 531                                         strlcat(string, udev_parent.name, maxsize);
 532                                         dbg("substitute parent node name'%s'", udev_parent.name);
 533                                 } else
 534                                         dbg("parent not found in database");
 535                                 udev_cleanup_device(&udev_parent);
 536                         }
 537                         break;
 538                 case SUBST_TEMP_NODE:
 539                         if (udev->tmp_node[0] == '\0') {
 540                                 dbg("create temporary device node for callout");
 541                                 snprintf(udev->tmp_node, sizeof(udev->tmp_node), "%s/.tmp-%u-%u",
 542                                          udev_root, major(udev->devt), minor(udev->devt));
 543                                 udev->tmp_node[sizeof(udev->tmp_node)-1] = '\0';
 544                                 udev_make_node(udev, udev->tmp_node, udev->devt, 0600, 0, 0);
 545                         }
 546                         strlcat(string, udev->tmp_node, maxsize);
 547                         dbg("substitute temporary device node name '%s'", udev->tmp_node);
 548                         break;
 549                 case SUBST_ROOT:
 550                         strlcat(string, udev_root, maxsize);
 551                         dbg("substitute udev_root '%s'", udev_root);
 552                         break;
 553                 case SUBST_MODALIAS:
 554                         if (find_sysfs_attribute(NULL, sysfs_device, "modalias", temp2, sizeof(temp2)) != 0)
 555                                 break;
 556                         strlcat(string, temp2, maxsize);
 557                         dbg("substitute MODALIAS '%s'", temp2);
 558                         break;
 559                 case SUBST_ENV:
 560                         if (attr == NULL) {
 561                                 dbg("missing attribute");
 562                                 break;
 563                         }
 564                         pos = getenv(attr);
 565                         if (pos == NULL)
 566                                 break;
 567                         strlcat(string, pos, maxsize);
 568                         dbg("substitute env '%s=%s'", attr, pos);
 569                         break;
 570                 default:
 571                         err("unknown substitution type=%i", type);
 572                         break;
 573                 }
 574                 /* possibly truncate to format-char specified length */
 575                 if (len != -1) {
 576                         head[len] = '\0';
 577                         dbg("truncate to %i chars, subtitution string becomes '%s'", len, head);
 578                 }
 579
 580                 strlcat(string, temp, maxsize);
 581         }
 582 }
 583
 584 static int execute_program_pipe(const char *command, const char *subsystem, char *value, int len)
 585 {
 586         int retval;
 587         int count;
 588         int status;
 589         int pipefds[2];
 590         pid_t pid;
 591         char *pos;
 592         char arg[PATH_SIZE];
 593         char *argv[(sizeof(arg) / 2) + 1];
 594         int devnull;
 595         int i;
 596
 597         strlcpy(arg, command, sizeof(arg));
 598         i = 0;
 599         if (strchr(arg, ' ')) {
 600                 pos = arg;
 601                 while (pos != NULL) {
 602                         if (pos[0] == '\'') {
 603                                 /* don't separate if in apostrophes */
 604                                 pos++;
 605                                 argv[i] = strsep(&pos, "\'");
 606                                 while (pos && pos[0] == ' ')
 607                                         pos++;
 608                         } else {
 609                                 argv[i] = strsep(&pos, " ");
 610                         }
 611                         dbg("arg[%i] '%s'", i, argv[i]);
 612                         i++;
 613                 }
 614                 argv[i] =  NULL;
 615                 dbg("execute '%s' with parsed arguments", arg);
 616         } else {
 617                 argv[0] = arg;
 618                 argv[1] = (char *) subsystem;
 619                 argv[2] = NULL;
 620                 dbg("execute '%s' with subsystem '%s' argument", arg, argv[1]);
 621         }
 622
 623         retval = pipe(pipefds);
 624         if (retval != 0) {
 625                 err("pipe failed");
 626                 return -1;
 627         }
 628
 629         pid = fork();
 630         switch(pid) {
 631         case 0:
 632                 /* child dup2 write side of pipe to STDOUT */
 633                 devnull = open("/dev/null", O_RDWR);
 634                 if (devnull >= 0) {
 635                         dup2(devnull, STDIN_FILENO);
 636                         dup2(devnull, STDERR_FILENO);
 637                         close(devnull);
 638                 }
 639                 dup2(pipefds[1], STDOUT_FILENO);
 640                 retval = execv(arg, argv);
 641                 err("exec of program failed");
 642                 _exit(1);
 643         case -1:
 644                 err("fork of '%s' failed", arg);
 645                 retval = -1;
 646                 break;
 647         default:
 648                 /* parent reads from pipefds[0] */
 649                 close(pipefds[1]);
 650                 retval = 0;
 651                 i = 0;
 652                 while (1) {
 653                         count = read(pipefds[0], value + i, len - i-1);
 654                         if (count < 0) {
 655                                 err("read failed with '%s'", strerror(errno));
 656                                 retval = -1;
 657                         }
 658
 659                         if (count == 0)
 660                                 break;
 661
 662                         i += count;
 663                         if (i >= len-1) {
 664                                 err("result len %d too short", len);
 665                                 retval = -1;
 666                                 break;
 667                         }
 668                 }
 669                 value[i] = '\0';
 670
 671                 close(pipefds[0]);
 672                 waitpid(pid, &status, 0);
 673
 674                 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
 675                         dbg("exec program status 0x%x", status);
 676                         retval = -1;
 677                 }
 678         }
 679
 680         if (!retval) {
 681                 remove_trailing_char(value, '\n');
 682                 dbg("result is '%s'", value);
 683                 replace_untrusted_chars(value);
 684         } else
 685                 value[0] = '\0';
 686
 687         return retval;
 688 }
 689
 690 static int match_rule(struct udevice *udev, struct udev_rule *rule,
 691                       struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 692 {
 693         struct sysfs_device *parent_device = sysfs_device;
 694
 695         if (rule->action_operation != KEY_OP_UNSET) {
 696                 dbg("check for " KEY_ACTION " rule->action='%s' udev->action='%s'",
 697                     rule->action, udev->action);
 698                 if (strcmp_pattern(rule->action, udev->action) != 0) {
 699                         dbg(KEY_ACTION " is not matching");
 700                         if (rule->action_operation != KEY_OP_NOMATCH)
 701                                 goto exit;
 702                 } else {
 703                         dbg(KEY_ACTION " matches");
 704                         if (rule->action_operation == KEY_OP_NOMATCH)
 705                                 goto exit;
 706                 }
 707                 dbg(KEY_ACTION " key is true");
 708         }
 709
 710         if (rule->kernel_operation != KEY_OP_UNSET) {
 711                 dbg("check for " KEY_KERNEL " rule->kernel='%s' udev_kernel_name='%s'",
 712                     rule->kernel, udev->kernel_name);
 713                 if (strcmp_pattern(rule->kernel, udev->kernel_name) != 0) {
 714                         dbg(KEY_KERNEL " is not matching");
 715                         if (rule->kernel_operation != KEY_OP_NOMATCH)
 716                                 goto exit;
 717                 } else {
 718                         dbg(KEY_KERNEL " matches");
 719                         if (rule->kernel_operation == KEY_OP_NOMATCH)
 720                                 goto exit;
 721                 }
 722                 dbg(KEY_KERNEL " key is true");
 723         }
 724
 725         if (rule->subsystem_operation != KEY_OP_UNSET) {
 726                 dbg("check for " KEY_SUBSYSTEM " rule->subsystem='%s' udev->subsystem='%s'",
 727                     rule->subsystem, udev->subsystem);
 728                 if (strcmp_pattern(rule->subsystem, udev->subsystem) != 0) {
 729                         dbg(KEY_SUBSYSTEM " is not matching");
 730                         if (rule->subsystem_operation != KEY_OP_NOMATCH)
 731                                 goto exit;
 732                 } else {
 733                         dbg(KEY_SUBSYSTEM " matches");
 734                         if (rule->subsystem_operation == KEY_OP_NOMATCH)
 735                                 goto exit;
 736                 }
 737                 dbg(KEY_SUBSYSTEM " key is true");
 738         }
 739
 740         if (rule->devpath_operation != KEY_OP_UNSET) {
 741                 dbg("check for " KEY_DEVPATH " rule->devpath='%s' udev->devpath='%s'",
 742                     rule->devpath, udev->devpath);
 743                 if (strcmp_pattern(rule->devpath, udev->devpath) != 0) {
 744                         dbg(KEY_DEVPATH " is not matching");
 745                         if (rule->devpath_operation != KEY_OP_NOMATCH)
 746                                 goto exit;
 747                 } else {
 748                         dbg(KEY_DEVPATH " matches");
 749                         if (rule->devpath_operation == KEY_OP_NOMATCH)
 750                                 goto exit;
 751                 }
 752                 dbg(KEY_DEVPATH " key is true");
 753         }
 754
 755         if (rule->modalias_operation != KEY_OP_UNSET) {
 756                 char value[NAME_SIZE];
 757
 758                 if (find_sysfs_attribute(NULL, sysfs_device, "modalias", value, sizeof(value)) != 0) {
 759                         dbg(KEY_MODALIAS " value not found");
 760                         goto exit;
 761                 }
 762                 dbg("check for " KEY_MODALIAS " rule->modalias='%s' modalias='%s'",
 763                     rule->modalias, value);
 764                 if (strcmp_pattern(rule->modalias, value) != 0) {
 765                         dbg(KEY_MODALIAS " is not matching");
 766                         if (rule->modalias_operation != KEY_OP_NOMATCH)
 767                                 goto exit;
 768                 } else {
 769                         dbg(KEY_MODALIAS " matches");
 770                         if (rule->modalias_operation == KEY_OP_NOMATCH)
 771                                 goto exit;
 772                 }
 773                 dbg(KEY_MODALIAS " key is true");
 774         }
 775
 776         if (rule->env_pair_count) {
 777                 int i;
 778
 779                 dbg("check for " KEY_ENV " pairs");
 780                 for (i = 0; i < rule->env_pair_count; i++) {
 781                         struct key_pair *pair;
 782                         const char *value;
 783
 784                         pair = &rule->env_pair[i];
 785                         value = getenv(pair->name);
 786                         if (!value) {
 787                                 dbg(KEY_ENV "{'%s'} is not found", pair->name);
 788                                 goto exit;
 789                         }
 790                         if (strcmp_pattern(pair->value, value) != 0) {
 791                                 dbg(KEY_ENV "{'%s'} is not matching", pair->name);
 792                                 if (pair->operation != KEY_OP_NOMATCH)
 793                                         goto exit;
 794                         } else {
 795                                 dbg(KEY_ENV "{'%s'} matches", pair->name);
 796                                 if (pair->operation == KEY_OP_NOMATCH)
 797                                         goto exit;
 798                         }
 799                 }
 800                 dbg(KEY_ENV " key is true");
 801         }
 802
 803         /* walk up the chain of physical devices and find a match */
 804         while (1) {
 805                 /* check for matching driver */
 806                 if (rule->driver_operation != KEY_OP_UNSET) {
 807                         if (parent_device == NULL) {
 808                                 dbg("device has no sysfs_device");
 809                                 goto exit;
 810                         }
 811                         dbg("check for " KEY_DRIVER " rule->driver='%s' sysfs_device->driver_name='%s'",
 812                             rule->driver, parent_device->driver_name);
 813                         if (strcmp_pattern(rule->driver, parent_device->driver_name) != 0) {
 814                                 dbg(KEY_DRIVER " is not matching");
 815                                 if (rule->driver_operation != KEY_OP_NOMATCH)
 816                                         goto try_parent;
 817                         } else {
 818                                 dbg(KEY_DRIVER " matches");
 819                                 if (rule->driver_operation == KEY_OP_NOMATCH)
 820                                         goto try_parent;
 821                         }
 822                         dbg(KEY_DRIVER " key is true");
 823                 }
 824
 825                 /* check for matching bus value */
 826                 if (rule->bus_operation != KEY_OP_UNSET) {
 827                         if (parent_device == NULL) {
 828                                 dbg("device has no sysfs_device");
 829                                 goto exit;
 830                         }
 831                         dbg("check for " KEY_BUS " rule->bus='%s' sysfs_device->bus='%s'",
 832                             rule->bus, parent_device->bus);
 833                         if (strcmp_pattern(rule->bus, parent_device->bus) != 0) {
 834                                 dbg(KEY_BUS " is not matching");
 835                                 if (rule->bus_operation != KEY_OP_NOMATCH)
 836                                         goto try_parent;
 837                         } else {
 838                                 dbg(KEY_BUS " matches");
 839                                 if (rule->bus_operation == KEY_OP_NOMATCH)
 840                                         goto try_parent;
 841                         }
 842                         dbg(KEY_BUS " key is true");
 843                 }
 844
 845                 /* check for matching bus id */
 846                 if (rule->id_operation != KEY_OP_UNSET) {
 847                         if (parent_device == NULL) {
 848                                 dbg("device has no sysfs_device");
 849                                 goto exit;
 850                         }
 851                         dbg("check " KEY_ID);
 852                         if (strcmp_pattern(rule->id, parent_device->bus_id) != 0) {
 853                                 dbg(KEY_ID " is not matching");
 854                                 if (rule->id_operation != KEY_OP_NOMATCH)
 855                                         goto try_parent;
 856                         } else {
 857                                 dbg(KEY_ID " matches");
 858                                 if (rule->id_operation == KEY_OP_NOMATCH)
 859                                         goto try_parent;
 860                         }
 861                         dbg(KEY_ID " key is true");
 862                 }
 863
 864                 /* check for matching sysfs pairs */
 865                 if (rule->sysfs_pair_count) {
 866                         int i;
 867
 868                         dbg("check " KEY_SYSFS " pairs");
 869                         for (i = 0; i < rule->sysfs_pair_count; i++) {
 870                                 struct key_pair *pair;
 871                                 char value[VALUE_SIZE];
 872                                 size_t len;
 873
 874                                 pair = &rule->sysfs_pair[i];
 875                                 if (find_sysfs_attribute(class_dev, parent_device, pair->name, value, sizeof(value)) != 0)
 876                                         goto try_parent;
 877
 878                                 /* strip trailing whitespace of value, if not asked to match for it */
 879                                 len = strlen(pair->value);
 880                                 if (len && !isspace(pair->value[len-1])) {
 881                                         len = strlen(value);
 882                                         while (len > 0 && isspace(value[len-1]))
 883                                                 value[--len] = '\0';
 884                                         dbg("removed %i trailing whitespace chars from '%s'", strlen(value)-len, value);
 885                                 }
 886
 887                                 dbg("compare attribute '%s' value '%s' with '%s'", pair->name, value, pair->value);
 888                                 if (strcmp_pattern(pair->value, value) != 0) {
 889                                         dbg(KEY_SYSFS "{'%s'} is not matching", pair->name);
 890                                         if (pair->operation != KEY_OP_NOMATCH)
 891                                                 goto try_parent;
 892                                 } else {
 893                                         dbg(KEY_SYSFS "{'%s'} matches", pair->name);
 894                                         if (pair->operation == KEY_OP_NOMATCH)
 895                                                 goto try_parent;
 896                                 }
 897                         }
 898                         dbg(KEY_SYSFS " keys are true");
 899                 }
 900
 901                 /* found matching physical device  */
 902                 break;
 903 try_parent:
 904                 dbg("try parent sysfs device");
 905                 parent_device = sysfs_get_device_parent(parent_device);
 906                 if (parent_device == NULL)
 907                         goto exit;
 908                 dbg("look at sysfs_device->path='%s'", parent_device->path);
 909                 dbg("look at sysfs_device->bus_id='%s'", parent_device->bus_id);
 910         }
 911
 912         if (rule->import_operation != KEY_OP_UNSET) {
 913                 char import[PATH_SIZE];
 914
 915                 strlcpy(import, rule->import, sizeof(import));
 916                 apply_format(udev, import, sizeof(import), class_dev, sysfs_device);
 917                 dbg("check for " KEY_IMPORT " import='%s", import);
 918                 if (import_file_into_env(import) == 0) {
 919                         dbg(KEY_IMPORT " file '%s' imported", rule->import);
 920                         if (rule->import_operation == KEY_OP_NOMATCH)
 921                                 goto exit;
 922                 } else
 923                         goto exit;
 924                 dbg(KEY_IMPORT " key is true");
 925         }
 926
 927         /* execute external program */
 928         if (rule->program_operation != KEY_OP_UNSET) {
 929                 char program[PATH_SIZE];
 930
 931                 strlcpy(program, rule->program, sizeof(program));
 932                 apply_format(udev, program, sizeof(program), class_dev, sysfs_device);
 933                 dbg("check for " KEY_PROGRAM " program='%s", program);
 934                 if (execute_program_pipe(program, udev->subsystem,
 935                                          udev->program_result, sizeof(udev->program_result)) != 0) {
 936                         dbg(KEY_PROGRAM " returned nonzero");
 937                         if (rule->program_operation != KEY_OP_NOMATCH)
 938                                 goto exit;
 939                 } else {
 940                         dbg(KEY_PROGRAM " returned successful");
 941                         if (rule->program_operation == KEY_OP_NOMATCH)
 942                                 goto exit;
 943                 }
 944                 dbg(KEY_PROGRAM " key is true");
 945         }
 946
 947         /* check for matching result of external program */
 948         if (rule->result_operation != KEY_OP_UNSET) {
 949                 dbg("check for " KEY_RESULT " rule->result='%s', udev->program_result='%s'",
 950                    rule->result, udev->program_result);
 951                 if (strcmp_pattern(rule->result, udev->program_result) != 0) {
 952                         dbg(KEY_RESULT " is not matching");
 953                         if (rule->result_operation != KEY_OP_NOMATCH)
 954                                 goto exit;
 955                 } else {
 956                         dbg(KEY_RESULT " matches");
 957                         if (rule->result_operation == KEY_OP_NOMATCH)
 958                                 goto exit;
 959                 }
 960                 dbg(KEY_RESULT " key is true");
 961         }
 962
 963         /* rule matches */
 964         return 0;
 965
 966 exit:
 967         return -1;
 968 }
 969
 970 int udev_rules_get_name(struct udevice *udev, struct sysfs_class_device *class_dev)
 971 {
 972         struct sysfs_class_device *class_dev_parent;
 973         struct sysfs_device *sysfs_device = NULL;
 974         struct udev_rule *rule;
 975
 976         dbg("class_dev->name='%s'", class_dev->name);
 977
 978         /* Figure out where the "device"-symlink is at.  For char devices this will
 979          * always be in the class_dev->path.  On block devices, only the main block
 980          * device will have the device symlink in it's path. All partition devices
 981          * need to look at the symlink in its parent directory.
 982          */
 983         class_dev_parent = sysfs_get_classdev_parent(class_dev);
 984         if (class_dev_parent != NULL) {
 985                 dbg("given class device has a parent, use this instead");
 986                 sysfs_device = sysfs_get_classdev_device(class_dev_parent);
 987         } else {
 988                 sysfs_device = sysfs_get_classdev_device(class_dev);
 989         }
 990
 991         if (sysfs_device) {
 992                 dbg("found devices device: path='%s', bus_id='%s', bus='%s'",
 993                     sysfs_device->path, sysfs_device->bus_id, sysfs_device->bus);
 994                 strlcpy(udev->bus_id, sysfs_device->bus_id, sizeof(udev->bus_id));
 995         }
 996
 997         dbg("udev->kernel_name='%s'", udev->kernel_name);
 998
 999         /* look for a matching rule to apply */
1000         udev_rules_iter_init();
1001         while (1) {
1002                 rule = udev_rules_iter_next();
1003                 if (rule == NULL)
1004                         break;
1005
1006                 if (udev->name_set && rule->name_operation != KEY_OP_UNSET) {
1007                         dbg("node name already set, rule ignored");
1008                         continue;
1009                 }
1010
1011                 dbg("process rule");
1012                 if (match_rule(udev, rule, class_dev, sysfs_device) == 0) {
1013                         /* apply options */
1014                         if (rule->ignore_device) {
1015                                 info("configured rule in '%s[%i]' applied, '%s' is ignored",
1016                                      rule->config_file, rule->config_line, udev->kernel_name);
1017                                 udev->ignore_device = 1;
1018                                 return 0;
1019                         }
1020                         if (rule->ignore_remove) {
1021                                 udev->ignore_remove = 1;
1022                                 dbg("remove event should be ignored");
1023                         }
1024                         /* apply all_partitions option only at a main block device */
1025                         if (rule->partitions && udev->type == DEV_BLOCK && udev->kernel_number[0] == '\0') {
1026                                 udev->partitions = rule->partitions;
1027                                 dbg("creation of partition nodes requested");
1028                         }
1029
1030                         /* apply permissions */
1031                         if (!udev->mode_final && rule->mode != 0000) {
1032                                 if (rule->mode_operation == KEY_OP_ASSIGN_FINAL)
1033                                         udev->mode_final = 1;
1034                                 udev->mode = rule->mode;
1035                                 dbg("applied mode=%#o to '%s'", udev->mode, udev->kernel_name);
1036                         }
1037                         if (!udev->owner_final && rule->owner[0] != '\0') {
1038                                 if (rule->owner_operation == KEY_OP_ASSIGN_FINAL)
1039                                         udev->owner_final = 1;
1040                                 strlcpy(udev->owner, rule->owner, sizeof(udev->owner));
1041                                 apply_format(udev, udev->owner, sizeof(udev->owner), class_dev, sysfs_device);
1042                                 dbg("applied owner='%s' to '%s'", udev->owner, udev->kernel_name);
1043                         }
1044                         if (!udev->group_final && rule->group[0] != '\0') {
1045                                 if (rule->group_operation == KEY_OP_ASSIGN_FINAL)
1046                                         udev->group_final = 1;
1047                                 strlcpy(udev->group, rule->group, sizeof(udev->group));
1048                                 apply_format(udev, udev->group, sizeof(udev->group), class_dev, sysfs_device);
1049                                 dbg("applied group='%s' to '%s'", udev->group, udev->kernel_name);
1050                         }
1051
1052                         /* collect symlinks */
1053                         if (!udev->symlink_final && rule->symlink_operation != KEY_OP_UNSET) {
1054                                 char temp[PATH_SIZE];
1055                                 char *pos, *next;
1056
1057                                 if (rule->symlink_operation == KEY_OP_ASSIGN_FINAL)
1058                                         udev->symlink_final = 1;
1059                                 if (rule->symlink_operation == KEY_OP_ASSIGN || rule->symlink_operation == KEY_OP_ASSIGN_FINAL) {
1060                                         struct name_entry *name_loop;
1061                                         struct name_entry *temp_loop;
1062
1063                                         info("reset symlink list");
1064                                         list_for_each_entry_safe(name_loop, temp_loop, &udev->symlink_list, node) {
1065                                                 list_del(&name_loop->node);
1066                                                 free(name_loop);
1067                                         }
1068                                 }
1069                                 if (rule->symlink[0] != '\0') {
1070                                         info("configured rule in '%s[%i]' applied, added symlink '%s'",
1071                                              rule->config_file, rule->config_line, rule->symlink);
1072                                         strlcpy(temp, rule->symlink, sizeof(temp));
1073                                         apply_format(udev, temp, sizeof(temp), class_dev, sysfs_device);
1074
1075                                         /* add multiple symlinks separated by spaces */
1076                                         pos = temp;
1077                                         next = strchr(temp, ' ');
1078                                         while (next) {
1079                                                 next[0] = '\0';
1080                                                 info("add symlink '%s'", pos);
1081                                                 name_list_add(&udev->symlink_list, pos, 0);
1082                                                 pos = &next[1];
1083                                                 next = strchr(pos, ' ');
1084                                         }
1085                                         info("add symlink '%s'", pos);
1086                                         name_list_add(&udev->symlink_list, pos, 0);
1087                                 }
1088                         }
1089
1090                         /* set name, later rules with name set will be ignored */
1091                         if (rule->name_operation != KEY_OP_UNSET) {
1092                                 udev->name_set = 1;
1093                                 if (rule->name[0] == '\0') {
1094                                         info("configured rule in '%s[%i]' applied, node handling for '%s' supressed",
1095                                              rule->config_file, rule->config_line, udev->kernel_name);
1096                                 } else {
1097                                         strlcpy(udev->name, rule->name, sizeof(udev->name));
1098                                         apply_format(udev, udev->name, sizeof(udev->name), class_dev, sysfs_device);
1099                                         strlcpy(udev->config_file, rule->config_file, sizeof(udev->config_file));
1100                                         udev->config_line = rule->config_line;
1101
1102                                         info("configured rule in '%s:%i' applied, '%s' becomes '%s'",
1103                                              rule->config_file, rule->config_line, udev->kernel_name, rule->name);
1104                                         if (udev->type != DEV_NET)
1105                                                 dbg("name, '%s' is going to have owner='%s', group='%s', mode=%#o partitions=%i",
1106                                                     udev->name, udev->owner, udev->group, udev->mode, udev->partitions);
1107                                 }
1108                         }
1109
1110                         if (!udev->run_final && rule->run_operation != KEY_OP_UNSET) {
1111                                 char program[PATH_SIZE];
1112
1113                                 if (rule->run_operation == KEY_OP_ASSIGN_FINAL)
1114                                         udev->run_final = 1;
1115                                 if (rule->run_operation == KEY_OP_ASSIGN || rule->run_operation == KEY_OP_ASSIGN_FINAL) {
1116                                         struct name_entry *name_loop;
1117                                         struct name_entry *temp_loop;
1118
1119                                         info("reset run list");
1120                                         list_for_each_entry_safe(name_loop, temp_loop, &udev->run_list, node) {
1121                                                 list_del(&name_loop->node);
1122                                                 free(name_loop);
1123                                         }
1124                                 }
1125                                 if (rule->run[0] != '\0') {
1126                                         strlcpy(program, rule->run, sizeof(program));
1127                                         apply_format(udev, program, sizeof(program), class_dev, sysfs_device);
1128                                         dbg("add run '%s'", program);
1129                                         name_list_add(&udev->run_list, program, 0);
1130                                 }
1131                         }
1132
1133                         if (rule->last_rule) {
1134                                 dbg("last rule to be applied");
1135                                 break;
1136                         }
1137                 }
1138         }
1139
1140         if (udev->name[0] == '\0') {
1141                 strlcpy(udev->name, udev->kernel_name, sizeof(udev->name));
1142                 info("no rule found, use kernel name '%s'", udev->name);
1143         }
1144
1145         if (udev->tmp_node[0] != '\0') {
1146                 dbg("removing temporary device node");
1147                 unlink_secure(udev->tmp_node);
1148                 udev->tmp_node[0] = '\0';
1149         }
1150
1151         return 0;
1152 }
1153
1154 int udev_rules_get_run(struct udevice *udev, struct sysfs_device *sysfs_device)
1155 {
1156         struct udev_rule *rule;
1157
1158         /* look for a matching rule to apply */
1159         udev_rules_iter_init();
1160         while (1) {
1161                 rule = udev_rules_iter_next();
1162                 if (rule == NULL)
1163                         break;
1164
1165                 dbg("process rule");
1166                 if (rule->run_operation == KEY_OP_UNSET)
1167                         continue;
1168
1169                 if (rule->name_operation != KEY_OP_UNSET || rule->symlink_operation != KEY_OP_UNSET ||
1170                     rule->mode != 0000 || rule->owner[0] != '\0' || rule->group[0] != '\0') {
1171                         dbg("skip rule that names a device");
1172                         continue;
1173                 }
1174
1175                 if (match_rule(udev, rule, NULL, sysfs_device) == 0) {
1176                         if (rule->ignore_device) {
1177                                 info("configured rule in '%s[%i]' applied, '%s' is ignored",
1178                                      rule->config_file, rule->config_line, udev->kernel_name);
1179                                 udev->ignore_device = 1;
1180                                 return 0;
1181                         }
1182
1183                         if (!udev->run_final && rule->run_operation != KEY_OP_UNSET) {
1184                                 char program[PATH_SIZE];
1185
1186                                 if (rule->run_operation == KEY_OP_ASSIGN || rule->run_operation == KEY_OP_ASSIGN_FINAL) {
1187                                         struct name_entry *name_loop;
1188                                         struct name_entry *temp_loop;
1189
1190                                         info("reset run list");
1191                                         list_for_each_entry_safe(name_loop, temp_loop, &udev->run_list, node) {
1192                                                 list_del(&name_loop->node);
1193                                                 free(name_loop);
1194                                         }
1195                                 }
1196                                 if (rule->run[0] != '\0') {
1197                                         strlcpy(program, rule->run, sizeof(program));
1198                                         apply_format(udev, program, sizeof(program), NULL, sysfs_device);
1199                                         dbg("add run '%s'", program);
1200                                         name_list_add(&udev->run_list, program, 0);
1201                                 }
1202                                 if (rule->run_operation == KEY_OP_ASSIGN_FINAL)
1203                                         break;
1204                         }
1205
1206                         if (rule->last_rule) {
1207                                 dbg("last rule to be applied");
1208                                 break;
1209                         }
1210                 }
1211         }
1212
1213         return 0;
1214 }