udev_rules.c

   1 /*
   2  * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
   3  * Copyright (C) 2003-2006 Kay Sievers <kay.sievers@vrfy.org>
   4  *
   5  *      This program is free software; you can redistribute it and/or modify it
   6  *      under the terms of the GNU General Public License as published by the
   7  *      Free Software Foundation version 2 of the License.
   8  *
   9  *      This program is distributed in the hope that it will be useful, but
  10  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *      General Public License for more details.
  13  *
  14  *      You should have received a copy of the GNU General Public License along
  15  *      with this program; if not, write to the Free Software Foundation, Inc.,
  16  *      51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  17  *
  18  */
  19
  20 #include <stddef.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <stdio.h>
  24 #include <fcntl.h>
  25 #include <ctype.h>
  26 #include <unistd.h>
  27 #include <errno.h>
  28 #include <syslog.h>
  29 #include <fnmatch.h>
  30 #include <sys/socket.h>
  31 #include <sys/un.h>
  32 #include <sys/wait.h>
  33 #include <sys/stat.h>
  34
  35 #include "udev.h"
  36 #include "udev_rules.h"
  37
  38 extern char **environ;
  39
  40 /* extract possible {attr} and move str behind it */
  41 static char *get_format_attribute(char **str)
  42 {
  43         char *pos;
  44         char *attr = NULL;
  45
  46         if (*str[0] == '{') {
  47                 pos = strchr(*str, '}');
  48                 if (pos == NULL) {
  49                         err("missing closing brace for format");
  50                         return NULL;
  51                 }
  52                 pos[0] = '\0';
  53                 attr = *str+1;
  54                 *str = pos+1;
  55                 dbg("attribute='%s', str='%s'", attr, *str);
  56         }
  57         return attr;
  58 }
  59
  60 /* extract possible format length and move str behind it*/
  61 static int get_format_len(char **str)
  62 {
  63         int num;
  64         char *tail;
  65
  66         if (isdigit(*str[0])) {
  67                 num = (int) strtoul(*str, &tail, 10);
  68                 if (num > 0) {
  69                         *str = tail;
  70                         dbg("format length=%i", num);
  71                         return num;
  72                 } else {
  73                         err("format parsing error '%s'", *str);
  74                 }
  75         }
  76         return -1;
  77 }
  78
  79 static int get_key(char **line, char **key, char **value)
  80 {
  81         char *linepos;
  82         char *temp;
  83
  84         linepos = *line;
  85         if (linepos == NULL)
  86                 return -1;
  87
  88         /* skip whitespace */
  89         while (isspace(linepos[0]))
  90                 linepos++;
  91
  92         /* get the key */
  93         temp = strchr(linepos, '=');
  94         if (temp == NULL || temp == linepos)
  95                 return -1;
  96         temp[0] = '\0';
  97         *key = linepos;
  98         linepos = &temp[1];
  99
 100         /* get a quoted value */
 101         if (linepos[0] == '"' || linepos[0] == '\'') {
 102                 temp = strchr(&linepos[1], linepos[0]);
 103                 if (temp != NULL) {
 104                         temp[0] = '\0';
 105                         *value = &linepos[1];
 106                         goto out;
 107                 }
 108         }
 109
 110         /* get the value*/
 111         temp = strchr(linepos, '\n');
 112         if (temp != NULL)
 113                 temp[0] = '\0';
 114         *value = linepos;
 115 out:
 116         return 0;
 117 }
 118
 119 static int run_program(const char *command, const char *subsystem,
 120                 char *result, size_t ressize, size_t *reslen)
 121 {
 122         int status;
 123         int outpipe[2] = {-1, -1};
 124         int errpipe[2] = {-1, -1};
 125         pid_t pid;
 126         char arg[PATH_SIZE];
 127         char program[PATH_SIZE];
 128         char *argv[(sizeof(arg) / 2) + 1];
 129         int devnull;
 130         int i;
 131         int retval = 0;
 132
 133         /* build argv from comand */
 134         strlcpy(arg, command, sizeof(arg));
 135         i = 0;
 136         if (strchr(arg, ' ') != NULL) {
 137                 char *pos = arg;
 138
 139                 while (pos != NULL) {
 140                         if (pos[0] == '\'') {
 141                                 /* don't separate if in apostrophes */
 142                                 pos++;
 143                                 argv[i] = strsep(&pos, "\'");
 144                                 while (pos != NULL && pos[0] == ' ')
 145                                         pos++;
 146                         } else {
 147                                 argv[i] = strsep(&pos, " ");
 148                         }
 149                         dbg("arg[%i] '%s'", i, argv[i]);
 150                         i++;
 151                 }
 152                 argv[i] = NULL;
 153         } else {
 154                 argv[0] = arg;
 155                 argv[1] = NULL;
 156         }
 157         info("'%s'", command);
 158
 159         /* prepare pipes from child to parent */
 160         if (result != NULL || udev_log_priority >= LOG_INFO) {
 161                 if (pipe(outpipe) != 0) {
 162                         err("pipe failed: %s", strerror(errno));
 163                         return -1;
 164                 }
 165         }
 166         if (udev_log_priority >= LOG_INFO) {
 167                 if (pipe(errpipe) != 0) {
 168                         err("pipe failed: %s", strerror(errno));
 169                         return -1;
 170                 }
 171         }
 172
 173         /* allow programs in /lib/udev called without the path */
 174         if (strchr(argv[0], '/') == NULL) {
 175                 strlcpy(program, "/lib/udev/", sizeof(program));
 176                 strlcat(program, argv[0], sizeof(program));
 177                 argv[0] = program;
 178         }
 179
 180         pid = fork();
 181         switch(pid) {
 182         case 0:
 183                 /* child closes parent ends of pipes */
 184                 if (outpipe[READ_END] > 0)
 185                         close(outpipe[READ_END]);
 186                 if (errpipe[READ_END] > 0)
 187                         close(errpipe[READ_END]);
 188
 189                 /* discard child output or connect to pipe */
 190                 devnull = open("/dev/null", O_RDWR);
 191                 if (devnull > 0) {
 192                         dup2(devnull, STDIN_FILENO);
 193                         if (outpipe[WRITE_END] < 0)
 194                                 dup2(devnull, STDOUT_FILENO);
 195                         if (errpipe[WRITE_END] < 0)
 196                                 dup2(devnull, STDERR_FILENO);
 197                         close(devnull);
 198                 } else
 199                         err("open /dev/null failed: %s", strerror(errno));
 200                 if (outpipe[WRITE_END] > 0) {
 201                         dup2(outpipe[WRITE_END], STDOUT_FILENO);
 202                         close(outpipe[WRITE_END]);
 203                 }
 204                 if (errpipe[WRITE_END] > 0) {
 205                         dup2(errpipe[WRITE_END], STDERR_FILENO);
 206                         close(errpipe[WRITE_END]);
 207                 }
 208                 execv(argv[0], argv);
 209                 if (errno == ENOENT || errno == ENOTDIR) {
 210                         /* may be on a filesytem which is not mounted right now */
 211                         info("program '%s' not found", argv[0]);
 212                 } else {
 213                         /* other problems */
 214                         err("exec of program '%s' failed", argv[0]);
 215                 }
 216                 _exit(1);
 217         case -1:
 218                 err("fork of '%s' failed: %s", argv[0], strerror(errno));
 219                 return -1;
 220         default:
 221                 /* read from child if requested */
 222                 if (outpipe[READ_END] > 0 || errpipe[READ_END] > 0) {
 223                         ssize_t count;
 224                         size_t respos = 0;
 225
 226                         /* parent closes child ends of pipes */
 227                         if (outpipe[WRITE_END] > 0)
 228                                 close(outpipe[WRITE_END]);
 229                         if (errpipe[WRITE_END] > 0)
 230                                 close(errpipe[WRITE_END]);
 231
 232                         /* read child output */
 233                         while (outpipe[READ_END] > 0 || errpipe[READ_END] > 0) {
 234                                 int fdcount;
 235                                 fd_set readfds;
 236
 237                                 FD_ZERO(&readfds);
 238                                 if (outpipe[READ_END] > 0)
 239                                         FD_SET(outpipe[READ_END], &readfds);
 240                                 if (errpipe[READ_END] > 0)
 241                                         FD_SET(errpipe[READ_END], &readfds);
 242                                 fdcount = select(UDEV_MAX(outpipe[READ_END], errpipe[READ_END])+1, &readfds, NULL, NULL, NULL);
 243                                 if (fdcount < 0) {
 244                                         if (errno == EINTR)
 245                                                 continue;
 246                                         retval = -1;
 247                                         break;
 248                                 }
 249
 250                                 /* get stdout */
 251                                 if (outpipe[READ_END] > 0 && FD_ISSET(outpipe[READ_END], &readfds)) {
 252                                         char inbuf[1024];
 253                                         char *pos;
 254                                         char *line;
 255
 256                                         count = read(outpipe[READ_END], inbuf, sizeof(inbuf)-1);
 257                                         if (count <= 0) {
 258                                                 close(outpipe[READ_END]);
 259                                                 outpipe[READ_END] = -1;
 260                                                 if (count < 0) {
 261                                                         err("stdin read failed: %s", strerror(errno));
 262                                                         retval = -1;
 263                                                 }
 264                                                 continue;
 265                                         }
 266                                         inbuf[count] = '\0';
 267
 268                                         /* store result for rule processing */
 269                                         if (result) {
 270                                                 if (respos + count < ressize) {
 271                                                         memcpy(&result[respos], inbuf, count);
 272                                                         respos += count;
 273                                                 } else {
 274                                                         err("ressize %ld too short", (long)ressize);
 275                                                         retval = -1;
 276                                                 }
 277                                         }
 278                                         pos = inbuf;
 279                                         while ((line = strsep(&pos, "\n")))
 280                                                 if (pos || line[0] != '\0')
 281                                                         info("'%s' (stdout) '%s'", argv[0], line);
 282                                 }
 283
 284                                 /* get stderr */
 285                                 if (errpipe[READ_END] > 0 && FD_ISSET(errpipe[READ_END], &readfds)) {
 286                                         char errbuf[1024];
 287                                         char *pos;
 288                                         char *line;
 289
 290                                         count = read(errpipe[READ_END], errbuf, sizeof(errbuf)-1);
 291                                         if (count <= 0) {
 292                                                 close(errpipe[READ_END]);
 293                                                 errpipe[READ_END] = -1;
 294                                                 if (count < 0)
 295                                                         err("stderr read failed: %s", strerror(errno));
 296                                                 continue;
 297                                         }
 298                                         errbuf[count] = '\0';
 299                                         pos = errbuf;
 300                                         while ((line = strsep(&pos, "\n")))
 301                                                 if (pos || line[0] != '\0')
 302                                                         info("'%s' (stderr) '%s'", argv[0], line);
 303                                 }
 304                         }
 305                         if (outpipe[READ_END] > 0)
 306                                 close(outpipe[READ_END]);
 307                         if (errpipe[READ_END] > 0)
 308                                 close(errpipe[READ_END]);
 309
 310                         /* return the childs stdout string */
 311                         if (result) {
 312                                 result[respos] = '\0';
 313                                 dbg("result='%s'", result);
 314                                 if (reslen)
 315                                         *reslen = respos;
 316                         }
 317                 }
 318                 waitpid(pid, &status, 0);
 319                 if (WIFEXITED(status)) {
 320                         info("'%s' returned with status %i", argv[0], WEXITSTATUS(status));
 321                         if (WEXITSTATUS(status) != 0)
 322                                 retval = -1;
 323                 } else {
 324                         err("'%s' abnormal exit", argv[0]);
 325                         retval = -1;
 326                 }
 327         }
 328
 329         return retval;
 330 }
 331
 332 static int import_keys_into_env(struct udevice *udev, const char *buf, size_t bufsize)
 333 {
 334         char line[LINE_SIZE];
 335         const char *bufline;
 336         char *linepos;
 337         char *variable;
 338         char *value;
 339         size_t cur;
 340         size_t count;
 341         int lineno;
 342
 343         /* loop through the whole buffer */
 344         lineno = 0;
 345         cur = 0;
 346         while (cur < bufsize) {
 347                 count = buf_get_line(buf, bufsize, cur);
 348                 bufline = &buf[cur];
 349                 cur += count+1;
 350                 lineno++;
 351
 352                 if (count >= sizeof(line)) {
 353                         err("line too long, conf line skipped %s, line %d", udev_config_filename, lineno);
 354                         continue;
 355                 }
 356
 357                 /* eat the whitespace */
 358                 while ((count > 0) && isspace(bufline[0])) {
 359                         bufline++;
 360                         count--;
 361                 }
 362                 if (count == 0)
 363                         continue;
 364
 365                 /* see if this is a comment */
 366                 if (bufline[0] == COMMENT_CHARACTER)
 367                         continue;
 368
 369                 memcpy(line, bufline, count);
 370                 line[count] = '\0';
 371
 372                 linepos = line;
 373                 if (get_key(&linepos, &variable, &value) == 0) {
 374                         dbg("import '%s=%s'", variable, value);
 375
 376                         /* handle device, renamed by external tool, returning new path */
 377                         if (strcmp(variable, "DEVPATH") == 0) {
 378                                 info("updating devpath from '%s' to '%s'", udev->dev->devpath, value);
 379                                 sysfs_device_set_values(udev->dev, value, NULL, NULL);
 380                         } else
 381                                 name_list_key_add(&udev->env_list, variable, value);
 382                         setenv(variable, value, 1);
 383                 }
 384         }
 385
 386         return 0;
 387 }
 388
 389 static int import_file_into_env(struct udevice *udev, const char *filename)
 390 {
 391         char *buf;
 392         size_t bufsize;
 393
 394         if (file_map(filename, &buf, &bufsize) != 0) {
 395                 err("can't open '%s': %s", filename, strerror(errno));
 396                 return -1;
 397         }
 398         import_keys_into_env(udev, buf, bufsize);
 399         file_unmap(buf, bufsize);
 400
 401         return 0;
 402 }
 403
 404 static int import_program_into_env(struct udevice *udev, const char *program)
 405 {
 406         char result[2048];
 407         size_t reslen;
 408
 409         if (run_program(program, udev->dev->subsystem, result, sizeof(result), &reslen) != 0)
 410                 return -1;
 411         return import_keys_into_env(udev, result, reslen);
 412 }
 413
 414 static int import_parent_into_env(struct udevice *udev, const char *filter)
 415 {
 416         struct sysfs_device *dev_parent;
 417         int rc = -1;
 418
 419         dev_parent = sysfs_device_get_parent(udev->dev);
 420         if (dev_parent != NULL) {
 421                 struct udevice *udev_parent;
 422                 struct name_entry *name_loop;
 423
 424                 dbg("found parent '%s', get the node name", dev_parent->devpath);
 425                 udev_parent = udev_device_init(NULL);
 426                 if (udev_parent == NULL)
 427                         return -1;
 428                 /* import the udev_db of the parent */
 429                 if (udev_db_get_device(udev_parent, dev_parent->devpath) == 0) {
 430                         dbg("import stored parent env '%s'", udev_parent->name);
 431                         list_for_each_entry(name_loop, &udev_parent->env_list, node) {
 432                                 char name[NAME_SIZE];
 433                                 char *pos;
 434
 435                                 strlcpy(name, name_loop->name, sizeof(name));
 436                                 pos = strchr(name, '=');
 437                                 if (pos) {
 438                                         pos[0] = '\0';
 439                                         pos++;
 440                                         if (fnmatch(filter, name, 0) == 0) {
 441                                                 dbg("import key '%s'", name_loop->name);
 442                                                 name_list_add(&udev->env_list, name_loop->name, 0);
 443                                                 setenv(name, pos, 1);
 444                                         } else
 445                                                 dbg("skip key '%s'", name_loop->name);
 446                                 }
 447                         }
 448                         rc = 0;
 449                 } else
 450                         dbg("parent not found in database");
 451                 udev_device_cleanup(udev_parent);
 452         }
 453
 454         return rc;
 455 }
 456
 457 static int pass_env_to_socket(const char *sockname, const char *devpath, const char *action)
 458 {
 459         int sock;
 460         struct sockaddr_un saddr;
 461         socklen_t addrlen;
 462         char buf[2048];
 463         size_t bufpos = 0;
 464         int i;
 465         ssize_t count;
 466         int retval = 0;
 467
 468         dbg("pass environment to socket '%s'", sockname);
 469         sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
 470         memset(&saddr, 0x00, sizeof(struct sockaddr_un));
 471         saddr.sun_family = AF_LOCAL;
 472         /* abstract namespace only */
 473         strcpy(&saddr.sun_path[1], sockname);
 474         addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path+1) + 1;
 475
 476         bufpos = snprintf(buf, sizeof(buf)-1, "%s@%s", action, devpath);
 477         bufpos++;
 478         for (i = 0; environ[i] != NULL && bufpos < sizeof(buf); i++) {
 479                 bufpos += strlcpy(&buf[bufpos], environ[i], sizeof(buf) - bufpos-1);
 480                 bufpos++;
 481         }
 482
 483         count = sendto(sock, &buf, bufpos, 0, (struct sockaddr *)&saddr, addrlen);
 484         if (count < 0)
 485                 retval = -1;
 486         info("passed %zi bytes to socket '%s', ", count, sockname);
 487
 488         close(sock);
 489         return retval;
 490 }
 491
 492 int udev_rules_run(struct udevice *udev)
 493 {
 494         struct name_entry *name_loop;
 495         int retval = 0;
 496
 497         dbg("executing run list");
 498         list_for_each_entry(name_loop, &udev->run_list, node) {
 499                 if (strncmp(name_loop->name, "socket:", strlen("socket:")) == 0) {
 500                         pass_env_to_socket(&name_loop->name[strlen("socket:")], udev->dev->devpath, udev->action);
 501                 } else {
 502                         char program[PATH_SIZE];
 503
 504                         strlcpy(program, name_loop->name, sizeof(program));
 505                         udev_rules_apply_format(udev, program, sizeof(program));
 506                         if (run_program(program, udev->dev->subsystem, NULL, 0, NULL) != 0)
 507                                 if (!name_loop->ignore_error)
 508                                         retval = -1;
 509                 }
 510         }
 511
 512         return retval;
 513 }
 514
 515 #define WAIT_LOOP_PER_SECOND            50
 516 static int wait_for_sysfs(struct udevice *udev, const char *file, int timeout)
 517 {
 518         char devicepath[PATH_SIZE];
 519         char filepath[PATH_SIZE];
 520         struct stat stats;
 521         int loop = timeout * WAIT_LOOP_PER_SECOND;
 522
 523         strlcpy(devicepath, sysfs_path, sizeof(devicepath));
 524         strlcat(devicepath, udev->dev->devpath, sizeof(devicepath));
 525         strlcpy(filepath, devicepath, sizeof(filepath));
 526         strlcat(filepath, "/", sizeof(filepath));
 527         strlcat(filepath, file, sizeof(filepath));
 528
 529         dbg("will wait %i sec for '%s'", timeout, filepath);
 530         while (--loop) {
 531                 /* lookup file */
 532                 if (stat(filepath, &stats) == 0) {
 533                         info("file '%s' appeared after %i loops", filepath, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
 534                         return 0;
 535                 }
 536                 /* make sure, the device did not disappear in the meantime */
 537                 if (stat(devicepath, &stats) != 0) {
 538                         info("device disappeared while waiting for '%s'", filepath);
 539                         return -2;
 540                 }
 541                 info("wait for '%s' for %i mseconds", filepath, 1000 / WAIT_LOOP_PER_SECOND);
 542                 usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
 543         }
 544         info("waiting for '%s' failed", filepath);
 545         return -1;
 546 }
 547
 548 /* handle "[$SUBSYSTEM/$KERNEL]<attribute>" lookup */
 549 static int attr_get_by_subsys_id(const char *attrstr, char *devpath, size_t len, char **attr)
 550 {
 551         char subsys[NAME_SIZE];
 552         char *attrib;
 553         char *id;
 554         int found = 0;
 555
 556         if (attrstr[0] != '[')
 557                 goto out;
 558
 559         strlcpy(subsys, &attrstr[1], sizeof(subsys));
 560
 561         attrib = strchr(subsys, ']');
 562         if (attrib == NULL)
 563                 goto out;
 564         attrib[0] = '\0';
 565         attrib = &attrib[1];
 566
 567         id = strchr(subsys, '/');
 568         if (id == NULL)
 569                 goto out;
 570         id[0] = '\0';
 571         id = &id[1];
 572
 573         if (sysfs_lookup_devpath_by_subsys_id(devpath, len, subsys, id)) {
 574                 if (attr != NULL) {
 575                         if (attrib[0] != '\0')
 576                                 *attr = attrib;
 577                         else
 578                                 *attr = NULL;
 579                 }
 580                 found = 1;
 581         }
 582 out:
 583         return found;
 584 }
 585
 586 void udev_rules_apply_format(struct udevice *udev, char *string, size_t maxsize)
 587 {
 588         char temp[PATH_SIZE];
 589         char temp2[PATH_SIZE];
 590         char *head, *tail, *pos, *cpos, *attr, *rest;
 591         int len;
 592         int i;
 593         int count;
 594         enum subst_type {
 595                 SUBST_UNKNOWN,
 596                 SUBST_DEVPATH,
 597                 SUBST_KERNEL,
 598                 SUBST_KERNEL_NUMBER,
 599                 SUBST_ID,
 600                 SUBST_DRIVER,
 601                 SUBST_MAJOR,
 602                 SUBST_MINOR,
 603                 SUBST_RESULT,
 604                 SUBST_ATTR,
 605                 SUBST_PARENT,
 606                 SUBST_TEMP_NODE,
 607                 SUBST_ROOT,
 608                 SUBST_SYS,
 609                 SUBST_ENV,
 610         };
 611         static const struct subst_map {
 612                 char *name;
 613                 char fmt;
 614                 enum subst_type type;
 615         } map[] = {
 616                 { .name = "devpath",    .fmt = 'p',     .type = SUBST_DEVPATH },
 617                 { .name = "number",     .fmt = 'n',     .type = SUBST_KERNEL_NUMBER },
 618                 { .name = "kernel",     .fmt = 'k',     .type = SUBST_KERNEL },
 619                 { .name = "id",         .fmt = 'b',     .type = SUBST_ID },
 620                 { .name = "driver",     .fmt = 'd',     .type = SUBST_DRIVER },
 621                 { .name = "major",      .fmt = 'M',     .type = SUBST_MAJOR },
 622                 { .name = "minor",      .fmt = 'm',     .type = SUBST_MINOR },
 623                 { .name = "result",     .fmt = 'c',     .type = SUBST_RESULT },
 624                 { .name = "attr",       .fmt = 's',     .type = SUBST_ATTR },
 625                 { .name = "sysfs",      .fmt = 's',     .type = SUBST_ATTR },
 626                 { .name = "parent",     .fmt = 'P',     .type = SUBST_PARENT },
 627                 { .name = "tempnode",   .fmt = 'N',     .type = SUBST_TEMP_NODE },
 628                 { .name = "root",       .fmt = 'r',     .type = SUBST_ROOT },
 629                 { .name = "sys",        .fmt = 'S',     .type = SUBST_SYS },
 630                 { .name = "env",        .fmt = 'E',     .type = SUBST_ENV },
 631                 { NULL, '\0', 0 }
 632         };
 633         enum subst_type type;
 634         const struct subst_map *subst;
 635
 636         head = string;
 637         while (1) {
 638                 len = -1;
 639                 while (head[0] != '\0') {
 640                         if (head[0] == '$') {
 641                                 /* substitute named variable */
 642                                 if (head[1] == '\0')
 643                                         break;
 644                                 if (head[1] == '$') {
 645                                         strlcpy(temp, head+2, sizeof(temp));
 646                                         strlcpy(head+1, temp, maxsize);
 647                                         head++;
 648                                         continue;
 649                                 }
 650                                 head[0] = '\0';
 651                                 for (subst = map; subst->name; subst++) {
 652                                         if (strncasecmp(&head[1], subst->name, strlen(subst->name)) == 0) {
 653                                                 type = subst->type;
 654                                                 tail = head + strlen(subst->name)+1;
 655                                                 dbg("will substitute format name '%s'", subst->name);
 656                                                 goto found;
 657                                         }
 658                                 }
 659                                 head[0] = '$';
 660                                 err("unknown format variable '%s'", head);
 661                         } else if (head[0] == '%') {
 662                                 /* substitute format char */
 663                                 if (head[1] == '\0')
 664                                         break;
 665                                 if (head[1] == '%') {
 666                                         strlcpy(temp, head+2, sizeof(temp));
 667                                         strlcpy(head+1, temp, maxsize);
 668                                         head++;
 669                                         continue;
 670                                 }
 671                                 head[0] = '\0';
 672                                 tail = head+1;
 673                                 len = get_format_len(&tail);
 674                                 for (subst = map; subst->name; subst++) {
 675                                         if (tail[0] == subst->fmt) {
 676                                                 type = subst->type;
 677                                                 tail++;
 678                                                 dbg("will substitute format char '%c'", subst->fmt);
 679                                                 goto found;
 680                                         }
 681                                 }
 682                                 head[0] = '%';
 683                                 err("unknown format char '%c'", tail[0]);
 684                         }
 685                         head++;
 686                 }
 687                 break;
 688 found:
 689                 attr = get_format_attribute(&tail);
 690                 strlcpy(temp, tail, sizeof(temp));
 691                 dbg("format=%i, string='%s', tail='%s'", type ,string, tail);
 692
 693                 switch (type) {
 694                 case SUBST_DEVPATH:
 695                         strlcat(string, udev->dev->devpath, maxsize);
 696                         dbg("substitute devpath '%s'", udev->dev->devpath);
 697                         break;
 698                 case SUBST_KERNEL:
 699                         strlcat(string, udev->dev->kernel, maxsize);
 700                         dbg("substitute kernel name '%s'", udev->dev->kernel);
 701                         break;
 702                 case SUBST_KERNEL_NUMBER:
 703                         strlcat(string, udev->dev->kernel_number, maxsize);
 704                         dbg("substitute kernel number '%s'", udev->dev->kernel_number);
 705                         break;
 706                 case SUBST_ID:
 707                         if (udev->dev_parent != NULL) {
 708                                 strlcat(string, udev->dev_parent->kernel, maxsize);
 709                                 dbg("substitute id '%s'", udev->dev_parent->kernel);
 710                         }
 711                         break;
 712                 case SUBST_DRIVER:
 713                         if (udev->dev_parent != NULL) {
 714                                 strlcat(string, udev->dev_parent->driver, maxsize);
 715                                 dbg("substitute driver '%s'", udev->dev_parent->driver);
 716                         }
 717                         break;
 718                 case SUBST_MAJOR:
 719                         sprintf(temp2, "%d", major(udev->devt));
 720                         strlcat(string, temp2, maxsize);
 721                         dbg("substitute major number '%s'", temp2);
 722                         break;
 723                 case SUBST_MINOR:
 724                         sprintf(temp2, "%d", minor(udev->devt));
 725                         strlcat(string, temp2, maxsize);
 726                         dbg("substitute minor number '%s'", temp2);
 727                         break;
 728                 case SUBST_RESULT:
 729                         if (udev->program_result[0] == '\0')
 730                                 break;
 731                         /* get part part of the result string */
 732                         i = 0;
 733                         if (attr != NULL)
 734                                 i = strtoul(attr, &rest, 10);
 735                         if (i > 0) {
 736                                 dbg("request part #%d of result string", i);
 737                                 cpos = udev->program_result;
 738                                 while (--i) {
 739                                         while (cpos[0] != '\0' && !isspace(cpos[0]))
 740                                                 cpos++;
 741                                         while (isspace(cpos[0]))
 742                                                 cpos++;
 743                                 }
 744                                 if (i > 0) {
 745                                         err("requested part of result string not found");
 746                                         break;
 747                                 }
 748                                 strlcpy(temp2, cpos, sizeof(temp2));
 749                                 /* %{2+}c copies the whole string from the second part on */
 750                                 if (rest[0] != '+') {
 751                                         cpos = strchr(temp2, ' ');
 752                                         if (cpos)
 753                                                 cpos[0] = '\0';
 754                                 }
 755                                 strlcat(string, temp2, maxsize);
 756                                 dbg("substitute part of result string '%s'", temp2);
 757                         } else {
 758                                 strlcat(string, udev->program_result, maxsize);
 759                                 dbg("substitute result string '%s'", udev->program_result);
 760                         }
 761                         break;
 762                 case SUBST_ATTR:
 763                         if (attr == NULL)
 764                                 err("missing file parameter for attr");
 765                         else {
 766                                 char devpath[PATH_SIZE];
 767                                 char *attrib;
 768                                 const char *value = NULL;
 769                                 size_t size;
 770
 771                                 if (attr_get_by_subsys_id(attr, devpath, sizeof(devpath), &attrib)) {
 772                                         if (attrib != NULL)
 773                                                 value = sysfs_attr_get_value(devpath, attrib);
 774                                         else
 775                                                 break;
 776                                 }
 777
 778                                 /* try the current device, other matches may have selected */
 779                                 if (value == NULL && udev->dev_parent != NULL && udev->dev_parent != udev->dev)
 780                                         value = sysfs_attr_get_value(udev->dev_parent->devpath, attr);
 781
 782                                 /* look at all devices along the chain of parents */
 783                                 if (value == NULL) {
 784                                         struct sysfs_device *dev_parent = udev->dev;
 785
 786                                         do {
 787                                                 dbg("looking at '%s'", dev_parent->devpath);
 788                                                 value = sysfs_attr_get_value(dev_parent->devpath, attr);
 789                                                 if (value != NULL) {
 790                                                         strlcpy(temp2, value, sizeof(temp2));
 791                                                         break;
 792                                                 }
 793                                                 dev_parent = sysfs_device_get_parent(dev_parent);
 794                                         } while (dev_parent != NULL);
 795                                 }
 796
 797                                 if (value == NULL)
 798                                         break;
 799
 800                                 /* strip trailing whitespace, and replace unwanted characters */
 801                                 size = strlcpy(temp2, value, sizeof(temp2));
 802                                 if (size >= sizeof(temp2))
 803                                         size = sizeof(temp2)-1;
 804                                 while (size > 0 && isspace(temp2[size-1]))
 805                                         temp2[--size] = '\0';
 806                                 count = replace_chars(temp2, ALLOWED_CHARS_INPUT);
 807                                 if (count > 0)
 808                                         info("%i character(s) replaced" , count);
 809                                 strlcat(string, temp2, maxsize);
 810                                 dbg("substitute sysfs value '%s'", temp2);
 811                         }
 812                         break;
 813                 case SUBST_PARENT:
 814                         {
 815                                 struct sysfs_device *dev_parent;
 816
 817                                 dev_parent = sysfs_device_get_parent(udev->dev);
 818                                 if (dev_parent != NULL) {
 819                                         struct udevice *udev_parent;
 820
 821                                         dbg("found parent '%s', get the node name", dev_parent->devpath);
 822                                         udev_parent = udev_device_init(NULL);
 823                                         if (udev_parent != NULL) {
 824                                                 /* lookup the name in the udev_db with the DEVPATH of the parent */
 825                                                 if (udev_db_get_device(udev_parent, dev_parent->devpath) == 0) {
 826                                                         strlcat(string, udev_parent->name, maxsize);
 827                                                         dbg("substitute parent node name'%s'", udev_parent->name);
 828                                                 } else
 829                                                         dbg("parent not found in database");
 830                                                 udev_device_cleanup(udev_parent);
 831                                         }
 832                                 }
 833                         }
 834                         break;
 835                 case SUBST_TEMP_NODE:
 836                         if (udev->tmp_node[0] == '\0' && major(udev->devt) > 0) {
 837                                 dbg("create temporary device node for callout");
 838                                 snprintf(udev->tmp_node, sizeof(udev->tmp_node), "%s/.tmp-%u-%u",
 839                                          udev_root, major(udev->devt), minor(udev->devt));
 840                                 udev->tmp_node[sizeof(udev->tmp_node)-1] = '\0';
 841                                 udev_node_mknod(udev, udev->tmp_node, udev->devt, 0600, 0, 0);
 842                         }
 843                         strlcat(string, udev->tmp_node, maxsize);
 844                         dbg("substitute temporary device node name '%s'", udev->tmp_node);
 845                         break;
 846                 case SUBST_ROOT:
 847                         strlcat(string, udev_root, maxsize);
 848                         dbg("substitute udev_root '%s'", udev_root);
 849                         break;
 850                 case SUBST_SYS:
 851                         strlcat(string, sysfs_path, maxsize);
 852                         dbg("substitute sysfs_path '%s'", sysfs_path);
 853                         break;
 854                 case SUBST_ENV:
 855                         if (attr == NULL) {
 856                                 dbg("missing attribute");
 857                                 break;
 858                         }
 859                         pos = getenv(attr);
 860                         if (pos == NULL) {
 861                                 dbg("env '%s' not available", attr);
 862                                 break;
 863                         }
 864                         dbg("substitute env '%s=%s'", attr, pos);
 865                         strlcat(string, pos, maxsize);
 866                         break;
 867                 default:
 868                         err("unknown substitution type=%i", type);
 869                         break;
 870                 }
 871                 /* possibly truncate to format-char specified length */
 872                 if (len >= 0 && len < (int)strlen(head)) {
 873                         head[len] = '\0';
 874                         dbg("truncate to %i chars, subtitution string becomes '%s'", len, head);
 875                 }
 876                 strlcat(string, temp, maxsize);
 877         }
 878 }
 879
 880 static char *key_val(struct udev_rule *rule, struct key *key)
 881 {
 882         return rule->buf + key->val_off;
 883 }
 884
 885 static char *key_pair_name(struct udev_rule *rule, struct key_pair *pair)
 886 {
 887         return rule->buf + pair->key_name_off;
 888 }
 889
 890 static int match_key(const char *key_name, struct udev_rule *rule, struct key *key, const char *val)
 891 {
 892         char value[PATH_SIZE];
 893         char *key_value;
 894         char *pos;
 895         int match = 0;
 896
 897         if (key->operation != KEY_OP_MATCH &&
 898             key->operation != KEY_OP_NOMATCH)
 899                 return 0;
 900
 901         /* look for a matching string, parts are separated by '|' */
 902         strlcpy(value, rule->buf + key->val_off, sizeof(value));
 903         key_value = value;
 904         dbg("key %s value='%s'", key_name, key_value);
 905         while (key_value) {
 906                 pos = strchr(key_value, '|');
 907                 if (pos) {
 908                         pos[0] = '\0';
 909                         pos++;
 910                 }
 911
 912                 dbg("match %s '%s' <-> '%s'", key_name, key_value, val);
 913                 match = (fnmatch(key_value, val, 0) == 0);
 914                 if (match)
 915                         break;
 916
 917                 key_value = pos;
 918         }
 919
 920         if (match && (key->operation == KEY_OP_MATCH)) {
 921                 dbg("%s is true (matching value)", key_name);
 922                 return 0;
 923         }
 924         if (!match && (key->operation == KEY_OP_NOMATCH)) {
 925                 dbg("%s is true (non-matching value)", key_name);
 926                 return 0;
 927         }
 928         return -1;
 929 }
 930
 931 /* match a single rule against a given device and possibly its parent devices */
 932 static int match_rule(struct udevice *udev, struct udev_rule *rule)
 933 {
 934         int i;
 935
 936         if (match_key("ACTION", rule, &rule->action, udev->action))
 937                 goto nomatch;
 938
 939         if (match_key("KERNEL", rule, &rule->kernel, udev->dev->kernel))
 940                 goto nomatch;
 941
 942         if (match_key("SUBSYSTEM", rule, &rule->subsystem, udev->dev->subsystem))
 943                 goto nomatch;
 944
 945         if (match_key("DEVPATH", rule, &rule->devpath, udev->dev->devpath))
 946                 goto nomatch;
 947
 948         if (match_key("DRIVER", rule, &rule->driver, udev->dev->driver))
 949                 goto nomatch;
 950
 951         if (match_key("NAME", rule, &rule->name, udev->name))
 952                 goto nomatch;
 953
 954         /* match against current list of symlinks */
 955         if (rule->symlink_match.operation == KEY_OP_MATCH ||
 956             rule->symlink_match.operation == KEY_OP_NOMATCH) {
 957                 struct name_entry *name_loop;
 958                 int match = 0;
 959
 960                 list_for_each_entry(name_loop, &udev->symlink_list, node) {
 961                         if (match_key("SYMLINK", rule, &rule->symlink_match, name_loop->name) == 0) {
 962                                 match = 1;
 963                                 break;
 964                         }
 965                 }
 966                 if (!match)
 967                         goto nomatch;
 968         }
 969
 970         for (i = 0; i < rule->env.count; i++) {
 971                 struct key_pair *pair = &rule->env.keys[i];
 972
 973                 /* we only check for matches, assignments will be handled later */
 974                 if (pair->key.operation == KEY_OP_MATCH ||
 975                     pair->key.operation == KEY_OP_NOMATCH) {
 976                         const char *key_name = key_pair_name(rule, pair);
 977                         const char *value = getenv(key_name);
 978
 979                         if (!value) {
 980                                 dbg("ENV{'%s'} is not set, treat as empty", key_name);
 981                                 value = "";
 982                         }
 983                         if (match_key("ENV", rule, &pair->key, value))
 984                                 goto nomatch;
 985                 }
 986         }
 987
 988         if (rule->test.operation != KEY_OP_UNSET) {
 989                 char filename[PATH_SIZE];
 990                 char devpath[PATH_SIZE];
 991                 char *attr;
 992                 struct stat statbuf;
 993                 int match;
 994
 995                 strlcpy(filename, key_val(rule, &rule->test), sizeof(filename));
 996                 udev_rules_apply_format(udev, filename, sizeof(filename));
 997
 998                 if (attr_get_by_subsys_id(filename, devpath, sizeof(devpath), &attr)) {
 999                         strlcpy(filename, sysfs_path, sizeof(filename));
1000                         strlcat(filename, devpath, sizeof(filename));
1001                         if (attr != NULL) {
1002                                 strlcat(filename, "/", sizeof(filename));
1003                                 strlcat(filename, attr, sizeof(filename));
1004                         }
1005                 }
1006
1007                 match = (stat(filename, &statbuf) == 0);
1008                 info("'%s' %s", filename, match ? "exists" : "does not exist");
1009                 if (match && rule->test_mode_mask > 0) {
1010                         match = ((statbuf.st_mode & rule->test_mode_mask) > 0);
1011                         info("'%s' has mode=%#o and %s %#o", filename, statbuf.st_mode,
1012                              match ? "matches" : "does not match",
1013                              rule->test_mode_mask);
1014                 }
1015                 if (match && rule->test.operation == KEY_OP_NOMATCH)
1016                         goto nomatch;
1017                 if (!match && rule->test.operation == KEY_OP_MATCH)
1018                         goto nomatch;
1019                 dbg("TEST key is true");
1020         }
1021
1022         if (rule->wait_for_sysfs.operation != KEY_OP_UNSET) {
1023                 int found;
1024
1025                 found = (wait_for_sysfs(udev, key_val(rule, &rule->wait_for_sysfs), 3) == 0);
1026                 if (!found && (rule->wait_for_sysfs.operation != KEY_OP_NOMATCH))
1027                         goto nomatch;
1028         }
1029
1030         /* check for matching sysfs attribute pairs */
1031         for (i = 0; i < rule->attr.count; i++) {
1032                 struct key_pair *pair = &rule->attr.keys[i];
1033
1034                 if (pair->key.operation == KEY_OP_MATCH ||
1035                     pair->key.operation == KEY_OP_NOMATCH) {
1036                         const char *key_name = key_pair_name(rule, pair);
1037                         const char *key_value = key_val(rule, &pair->key);
1038                         char devpath[PATH_SIZE];
1039                         char *attrib;
1040                         const char *value = NULL;
1041                         char val[VALUE_SIZE];
1042                         size_t len;
1043
1044                         if (attr_get_by_subsys_id(key_name, devpath, sizeof(devpath), &attrib)) {
1045                                 if (attrib != NULL)
1046                                         value = sysfs_attr_get_value(devpath, attrib);
1047                                 else
1048                                         goto nomatch;
1049                         }
1050                         if (value == NULL)
1051                                 value = sysfs_attr_get_value(udev->dev->devpath, key_name);
1052                         if (value == NULL)
1053                                 goto nomatch;
1054                         strlcpy(val, value, sizeof(val));
1055
1056                         /* strip trailing whitespace of value, if not asked to match for it */
1057                         len = strlen(key_value);
1058                         if (len > 0 && !isspace(key_value[len-1])) {
1059                                 len = strlen(val);
1060                                 while (len > 0 && isspace(val[len-1]))
1061                                         val[--len] = '\0';
1062                                 dbg("removed %zi trailing whitespace chars from '%s'", strlen(val)-len, val);
1063                         }
1064
1065                         if (match_key("ATTR", rule, &pair->key, val))
1066                                 goto nomatch;
1067                 }
1068         }
1069
1070         /* walk up the chain of parent devices and find a match */
1071         udev->dev_parent = udev->dev;
1072         while (1) {
1073                 /* check for matching kernel device name */
1074                 if (match_key("KERNELS", rule, &rule->kernels, udev->dev_parent->kernel))
1075                         goto try_parent;
1076
1077                 /* check for matching subsystem value */
1078                 if (match_key("SUBSYSTEMS", rule, &rule->subsystems, udev->dev_parent->subsystem))
1079                         goto try_parent;
1080
1081                 /* check for matching driver */
1082                 if (match_key("DRIVERS", rule, &rule->drivers, udev->dev_parent->driver))
1083                         goto try_parent;
1084
1085                 /* check for matching sysfs attribute pairs */
1086                 for (i = 0; i < rule->attrs.count; i++) {
1087                         struct key_pair *pair = &rule->attrs.keys[i];
1088
1089                         if (pair->key.operation == KEY_OP_MATCH ||
1090                             pair->key.operation == KEY_OP_NOMATCH) {
1091                                 const char *key_name = key_pair_name(rule, pair);
1092                                 const char *key_value = key_val(rule, &pair->key);
1093                                 const char *value;
1094                                 char val[VALUE_SIZE];
1095                                 size_t len;
1096
1097                                 value = sysfs_attr_get_value(udev->dev_parent->devpath, key_name);
1098                                 if (value == NULL)
1099                                         value = sysfs_attr_get_value(udev->dev->devpath, key_name);
1100                                 if (value == NULL)
1101                                         goto try_parent;
1102                                 strlcpy(val, value, sizeof(val));
1103
1104                                 /* strip trailing whitespace of value, if not asked to match for it */
1105                                 len = strlen(key_value);
1106                                 if (len > 0 && !isspace(key_value[len-1])) {
1107                                         len = strlen(val);
1108                                         while (len > 0 && isspace(val[len-1]))
1109                                                 val[--len] = '\0';
1110                                         dbg("removed %zi trailing whitespace chars from '%s'", strlen(val)-len, val);
1111                                 }
1112
1113                                 if (match_key("ATTRS", rule, &pair->key, val))
1114                                         goto try_parent;
1115                         }
1116                 }
1117
1118                 /* found matching device  */
1119                 break;
1120 try_parent:
1121                 /* move to parent device */
1122                 dbg("try parent sysfs device");
1123                 udev->dev_parent = sysfs_device_get_parent(udev->dev_parent);
1124                 if (udev->dev_parent == NULL)
1125                         goto nomatch;
1126                 dbg("looking at dev_parent->devpath='%s'", udev->dev_parent->devpath);
1127                 dbg("looking at dev_parent->kernel='%s'", udev->dev_parent->kernel);
1128         }
1129
1130         /* execute external program */
1131         if (rule->program.operation != KEY_OP_UNSET) {
1132                 char program[PATH_SIZE];
1133                 char result[PATH_SIZE];
1134
1135                 strlcpy(program, key_val(rule, &rule->program), sizeof(program));
1136                 udev_rules_apply_format(udev, program, sizeof(program));
1137                 if (run_program(program, udev->dev->subsystem, result, sizeof(result), NULL) != 0) {
1138                         dbg("PROGRAM is false");
1139                         udev->program_result[0] = '\0';
1140                         if (rule->program.operation != KEY_OP_NOMATCH)
1141                                 goto nomatch;
1142                 } else {
1143                         int count;
1144
1145                         dbg("PROGRAM matches");
1146                         remove_trailing_chars(result, '\n');
1147                         if (rule->string_escape == ESCAPE_UNSET ||
1148                             rule->string_escape == ESCAPE_REPLACE) {
1149                                 count = replace_chars(result, ALLOWED_CHARS_INPUT);
1150                                 if (count > 0)
1151                                         info("%i character(s) replaced" , count);
1152                         }
1153                         dbg("result is '%s'", result);
1154                         strlcpy(udev->program_result, result, sizeof(udev->program_result));
1155                         dbg("PROGRAM returned successful");
1156                         if (rule->program.operation == KEY_OP_NOMATCH)
1157                                 goto nomatch;
1158                 }
1159                 dbg("PROGRAM key is true");
1160         }
1161
1162         /* check for matching result of external program */
1163         if (match_key("RESULT", rule, &rule->result, udev->program_result))
1164                 goto nomatch;
1165
1166         /* import variables returned from program or or file into environment */
1167         if (rule->import.operation != KEY_OP_UNSET) {
1168                 char import[PATH_SIZE];
1169                 int rc = -1;
1170
1171                 strlcpy(import, key_val(rule, &rule->import), sizeof(import));
1172                 udev_rules_apply_format(udev, import, sizeof(import));
1173                 dbg("check for IMPORT import='%s'", import);
1174                 if (rule->import_type == IMPORT_PROGRAM) {
1175                         rc = import_program_into_env(udev, import);
1176                 } else if (rule->import_type == IMPORT_FILE) {
1177                         dbg("import file import='%s'", import);
1178                         rc = import_file_into_env(udev, import);
1179                 } else if (rule->import_type == IMPORT_PARENT) {
1180                         dbg("import parent import='%s'", import);
1181                         rc = import_parent_into_env(udev, import);
1182                 }
1183                 if (rc != 0) {
1184                         dbg("IMPORT failed");
1185                         if (rule->import.operation != KEY_OP_NOMATCH)
1186                                 goto nomatch;
1187                 } else
1188                         dbg("IMPORT '%s' imported", key_val(rule, &rule->import));
1189                 dbg("IMPORT key is true");
1190         }
1191
1192         /* rule matches, if we have ENV assignments export it */
1193         for (i = 0; i < rule->env.count; i++) {
1194                 struct key_pair *pair = &rule->env.keys[i];
1195
1196                 if (pair->key.operation == KEY_OP_ASSIGN) {
1197                         char temp_value[NAME_SIZE];
1198                         const char *key_name = key_pair_name(rule, pair);
1199                         const char *value = key_val(rule, &pair->key);
1200
1201                         /* make sure we don't write to the same string we possibly read from */
1202                         strlcpy(temp_value, value, sizeof(temp_value));
1203                         udev_rules_apply_format(udev, temp_value, NAME_SIZE);
1204
1205                         if (temp_value[0] == '\0') {
1206                                 name_list_key_remove(&udev->env_list, key_name);
1207                                 unsetenv(key_name);
1208                                 info("unset ENV '%s'", key_name);
1209                         } else {
1210                                 struct name_entry *entry;
1211
1212                                 entry = name_list_key_add(&udev->env_list, key_name, temp_value);
1213                                 if (entry == NULL)
1214                                         break;
1215                                 putenv(entry->name);
1216                                 info("set ENV '%s'", entry->name);
1217                         }
1218                 }
1219         }
1220
1221         /* if we have ATTR assignments, write value to sysfs file */
1222         for (i = 0; i < rule->attr.count; i++) {
1223                 struct key_pair *pair = &rule->attr.keys[i];
1224
1225                 if (pair->key.operation == KEY_OP_ASSIGN) {
1226                         const char *key_name = key_pair_name(rule, pair);
1227                         char devpath[PATH_SIZE];
1228                         char *attrib;
1229                         char attr[PATH_SIZE] = "";
1230                         char value[NAME_SIZE];
1231                         FILE *f;
1232
1233                         if (attr_get_by_subsys_id(key_name, devpath, sizeof(devpath), &attrib)) {
1234                                 if (attrib != NULL) {
1235                                         strlcpy(attr, sysfs_path, sizeof(attr));
1236                                         strlcat(attr, devpath, sizeof(attr));
1237                                         strlcat(attr, "/", sizeof(attr));
1238                                         strlcat(attr, attrib, sizeof(attr));
1239                                 }
1240                         }
1241
1242                         if (attr[0] == '\0') {
1243                                 strlcpy(attr, sysfs_path, sizeof(attr));
1244                                 strlcat(attr, udev->dev->devpath, sizeof(attr));
1245                                 strlcat(attr, "/", sizeof(attr));
1246                                 strlcat(attr, key_name, sizeof(attr));
1247                         }
1248
1249                         strlcpy(value, key_val(rule, &pair->key), sizeof(value));
1250                         udev_rules_apply_format(udev, value, sizeof(value));
1251                         info("writing '%s' to sysfs file '%s'", value, attr);
1252                         f = fopen(attr, "w");
1253                         if (f != NULL) {
1254                                 if (!udev->test_run)
1255                                         if (fprintf(f, "%s", value) <= 0)
1256                                                 err("error writing ATTR{%s}: %s", attr, strerror(errno));
1257                                 fclose(f);
1258                         } else
1259                                 err("error opening ATTR{%s} for writing: %s", attr, strerror(errno));
1260                 }
1261         }
1262         return 0;
1263
1264 nomatch:
1265         return -1;
1266 }
1267
1268 int udev_rules_get_name(struct udev_rules *rules, struct udevice *udev)
1269 {
1270         struct udev_rule *rule;
1271         int name_set = 0;
1272
1273         dbg("udev->dev->devpath='%s'", udev->dev->devpath);
1274         dbg("udev->dev->kernel='%s'", udev->dev->kernel);
1275
1276         /* use kernel name as default node name */
1277         strlcpy(udev->name, udev->dev->kernel, sizeof(udev->name));
1278
1279         /* look for a matching rule to apply */
1280         udev_rules_iter_init(rules);
1281         while (1) {
1282                 rule = udev_rules_iter_next(rules);
1283                 if (rule == NULL)
1284                         break;
1285
1286                 if (name_set &&
1287                     (rule->name.operation == KEY_OP_ASSIGN ||
1288                      rule->name.operation == KEY_OP_ASSIGN_FINAL ||
1289                      rule->name.operation == KEY_OP_ADD)) {
1290                         dbg("node name already set, rule ignored");
1291                         continue;
1292                 }
1293
1294                 dbg("process rule");
1295                 if (match_rule(udev, rule) == 0) {
1296                         /* apply options */
1297                         if (rule->ignore_device) {
1298                                 info("rule applied, '%s' is ignored", udev->dev->kernel);
1299                                 udev->ignore_device = 1;
1300                                 return 0;
1301                         }
1302                         if (rule->ignore_remove) {
1303                                 udev->ignore_remove = 1;
1304                                 dbg("remove event should be ignored");
1305                         }
1306                         if (rule->link_priority != 0) {
1307                                 udev->link_priority = rule->link_priority;
1308                                 info("link_priority=%i", udev->link_priority);
1309                         }
1310                         /* apply all_partitions option only at a main block device */
1311                         if (rule->partitions &&
1312                             strcmp(udev->dev->subsystem, "block") == 0 && udev->dev->kernel_number[0] == '\0') {
1313                                 udev->partitions = rule->partitions;
1314                                 dbg("creation of partition nodes requested");
1315                         }
1316
1317                         /* apply permissions */
1318                         if (!udev->mode_final && rule->mode != 0000) {
1319                                 if (rule->mode_operation == KEY_OP_ASSIGN_FINAL)
1320                                         udev->mode_final = 1;
1321                                 udev->mode = rule->mode;
1322                                 dbg("applied mode=%#o to '%s'", rule->mode, udev->dev->kernel);
1323                         }
1324                         if (!udev->owner_final && rule->owner.operation != KEY_OP_UNSET) {
1325                                 if (rule->owner.operation == KEY_OP_ASSIGN_FINAL)
1326                                         udev->owner_final = 1;
1327                                 strlcpy(udev->owner, key_val(rule, &rule->owner), sizeof(udev->owner));
1328                                 udev_rules_apply_format(udev, udev->owner, sizeof(udev->owner));
1329                                 dbg("applied owner='%s' to '%s'", udev->owner, udev->dev->kernel);
1330                         }
1331                         if (!udev->group_final && rule->group.operation != KEY_OP_UNSET) {
1332                                 if (rule->group.operation == KEY_OP_ASSIGN_FINAL)
1333                                         udev->group_final = 1;
1334                                 strlcpy(udev->group, key_val(rule, &rule->group), sizeof(udev->group));
1335                                 udev_rules_apply_format(udev, udev->group, sizeof(udev->group));
1336                                 dbg("applied group='%s' to '%s'", udev->group, udev->dev->kernel);
1337                         }
1338
1339                         /* collect symlinks */
1340                         if (!udev->symlink_final &&
1341                             (rule->symlink.operation == KEY_OP_ASSIGN ||
1342                              rule->symlink.operation == KEY_OP_ASSIGN_FINAL ||
1343                              rule->symlink.operation == KEY_OP_ADD)) {
1344                                 char temp[PATH_SIZE];
1345                                 char *pos, *next;
1346                                 int count;
1347
1348                                 if (rule->symlink.operation == KEY_OP_ASSIGN_FINAL)
1349                                         udev->symlink_final = 1;
1350                                 if (rule->symlink.operation == KEY_OP_ASSIGN ||
1351                                     rule->symlink.operation == KEY_OP_ASSIGN_FINAL) {
1352                                         info("reset symlink list");
1353                                         name_list_cleanup(&udev->symlink_list);
1354                                 }
1355                                 /* allow  multiple symlinks separated by spaces */
1356                                 strlcpy(temp, key_val(rule, &rule->symlink), sizeof(temp));
1357                                 udev_rules_apply_format(udev, temp, sizeof(temp));
1358                                 if (rule->string_escape == ESCAPE_UNSET ||
1359                                     rule->string_escape == ESCAPE_REPLACE) {
1360                                         count = replace_chars(temp, ALLOWED_CHARS_FILE " ");
1361                                         if (count > 0)
1362                                                 info("%i character(s) replaced" , count);
1363                                 }
1364                                 dbg("rule applied, added symlink(s) '%s'", temp);
1365                                 pos = temp;
1366                                 while (isspace(pos[0]))
1367                                         pos++;
1368                                 next = strchr(pos, ' ');
1369                                 while (next) {
1370                                         next[0] = '\0';
1371                                         info("add symlink '%s'", pos);
1372                                         name_list_add(&udev->symlink_list, pos, 0);
1373                                         while (isspace(next[1]))
1374                                                 next++;
1375                                         pos = &next[1];
1376                                         next = strchr(pos, ' ');
1377                                 }
1378                                 if (pos[0] != '\0') {
1379                                         info("add symlink '%s'", pos);
1380                                         name_list_add(&udev->symlink_list, pos, 0);
1381                                 }
1382                         }
1383
1384                         /* set name, later rules with name set will be ignored */
1385                         if (rule->name.operation == KEY_OP_ASSIGN ||
1386                             rule->name.operation == KEY_OP_ASSIGN_FINAL ||
1387                             rule->name.operation == KEY_OP_ADD) {
1388                                 int count;
1389
1390                                 name_set = 1;
1391                                 strlcpy(udev->name, key_val(rule, &rule->name), sizeof(udev->name));
1392                                 udev_rules_apply_format(udev, udev->name, sizeof(udev->name));
1393                                 if (rule->string_escape == ESCAPE_UNSET ||
1394                                     rule->string_escape == ESCAPE_REPLACE) {
1395                                         count = replace_chars(udev->name, ALLOWED_CHARS_FILE);
1396                                         if (count > 0)
1397                                                 info("%i character(s) replaced", count);
1398                                 }
1399
1400                                 info("rule applied, '%s' becomes '%s'", udev->dev->kernel, udev->name);
1401                                 if (strcmp(udev->dev->subsystem, "net") != 0)
1402                                         dbg("name, '%s' is going to have owner='%s', group='%s', mode=%#o partitions=%i",
1403                                             udev->name, udev->owner, udev->group, udev->mode, udev->partitions);
1404                         }
1405
1406                         if (!udev->run_final && rule->run.operation != KEY_OP_UNSET) {
1407                                 struct name_entry *entry;
1408
1409                                 if (rule->run.operation == KEY_OP_ASSIGN_FINAL)
1410                                         udev->run_final = 1;
1411                                 if (rule->run.operation == KEY_OP_ASSIGN || rule->run.operation == KEY_OP_ASSIGN_FINAL) {
1412                                         info("reset run list");
1413                                         name_list_cleanup(&udev->run_list);
1414                                 }
1415                                 dbg("add run '%s'", key_val(rule, &rule->run));
1416                                 entry = name_list_add(&udev->run_list, key_val(rule, &rule->run), 0);
1417                                 if (rule->run_ignore_error)
1418                                         entry->ignore_error = 1;
1419                         }
1420
1421                         if (rule->last_rule) {
1422                                 dbg("last rule to be applied");
1423                                 break;
1424                         }
1425
1426                         if (rule->goto_label.operation != KEY_OP_UNSET) {
1427                                 dbg("moving forward to label '%s'", key_val(rule, &rule->goto_label));
1428                                 udev_rules_iter_label(rules, key_val(rule, &rule->goto_label));
1429                         }
1430                 }
1431         }
1432
1433         if (!name_set)
1434                 info("no node name set, will use kernel name '%s'", udev->name);
1435
1436         if (udev->tmp_node[0] != '\0') {
1437                 dbg("removing temporary device node");
1438                 unlink_secure(udev->tmp_node);
1439                 udev->tmp_node[0] = '\0';
1440         }
1441
1442         return 0;
1443 }
1444
1445 int udev_rules_get_run(struct udev_rules *rules, struct udevice *udev)
1446 {
1447         struct udev_rule *rule;
1448
1449         dbg("udev->kernel='%s'", udev->dev->kernel);
1450
1451         /* look for a matching rule to apply */
1452         udev_rules_iter_init(rules);
1453         while (1) {
1454                 rule = udev_rules_iter_next(rules);
1455                 if (rule == NULL)
1456                         break;
1457
1458                 dbg("process rule");
1459                 if (rule->name.operation != KEY_OP_UNSET || rule->symlink.operation != KEY_OP_UNSET ||
1460                     rule->mode_operation != KEY_OP_UNSET || rule->owner.operation != KEY_OP_UNSET ||
1461                     rule->group.operation != KEY_OP_UNSET) {
1462                         dbg("skip rule that names a device");
1463                         continue;
1464                 }
1465
1466                 if (match_rule(udev, rule) == 0) {
1467                         if (rule->ignore_device) {
1468                                 info("rule applied, '%s' is ignored", udev->dev->kernel);
1469                                 udev->ignore_device = 1;
1470                                 return 0;
1471                         }
1472
1473                         if (!udev->run_final && rule->run.operation != KEY_OP_UNSET) {
1474                                 struct name_entry *entry;
1475
1476                                 if (rule->run.operation == KEY_OP_ASSIGN ||
1477                                     rule->run.operation == KEY_OP_ASSIGN_FINAL) {
1478                                         info("reset run list");
1479                                         name_list_cleanup(&udev->run_list);
1480                                 }
1481                                 dbg("add run '%s'", key_val(rule, &rule->run));
1482                                 entry = name_list_add(&udev->run_list, key_val(rule, &rule->run), 0);
1483                                 if (rule->run_ignore_error)
1484                                         entry->ignore_error = 1;
1485                                 if (rule->run.operation == KEY_OP_ASSIGN_FINAL)
1486                                         break;
1487                         }
1488
1489                         if (rule->last_rule) {
1490                                 dbg("last rule to be applied");
1491                                 break;
1492                         }
1493
1494                         if (rule->goto_label.operation != KEY_OP_UNSET) {
1495                                 dbg("moving forward to label '%s'", key_val(rule, &rule->goto_label));
1496                                 udev_rules_iter_label(rules, key_val(rule, &rule->goto_label));
1497                         }
1498                 }
1499         }
1500
1501         return 0;
1502 }