udev/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 <dirent.h>
  30 #include <fnmatch.h>
  31 #include <sys/socket.h>
  32 #include <sys/un.h>
  33 #include <sys/wait.h>
  34 #include <sys/stat.h>
  35
  36 #include "udev.h"
  37 #include "udev_rules.h"
  38 #include "udev_selinux.h"
  39
  40 extern char **environ;
  41
  42 /* extract possible {attr} and move str behind it */
  43 static char *get_format_attribute(struct udev *udev, char **str)
  44 {
  45         char *pos;
  46         char *attr = NULL;
  47
  48         if (*str[0] == '{') {
  49                 pos = strchr(*str, '}');
  50                 if (pos == NULL) {
  51                         err(udev, "missing closing brace for format\n");
  52                         return NULL;
  53                 }
  54                 pos[0] = '\0';
  55                 attr = *str+1;
  56                 *str = pos+1;
  57                 dbg(udev, "attribute='%s', str='%s'\n", attr, *str);
  58         }
  59         return attr;
  60 }
  61
  62 /* extract possible format length and move str behind it*/
  63 static int get_format_len(struct udev *udev, char **str)
  64 {
  65         int num;
  66         char *tail;
  67
  68         if (isdigit(*str[0])) {
  69                 num = (int) strtoul(*str, &tail, 10);
  70                 if (num > 0) {
  71                         *str = tail;
  72                         dbg(udev, "format length=%i\n", num);
  73                         return num;
  74                 } else {
  75                         err(udev, "format parsing error '%s'\n", *str);
  76                 }
  77         }
  78         return -1;
  79 }
  80
  81 static int get_key(char **line, char **key, char **value)
  82 {
  83         char *linepos;
  84         char *temp;
  85
  86         linepos = *line;
  87         if (linepos == NULL)
  88                 return -1;
  89
  90         /* skip whitespace */
  91         while (isspace(linepos[0]))
  92                 linepos++;
  93
  94         /* get the key */
  95         temp = strchr(linepos, '=');
  96         if (temp == NULL || temp == linepos)
  97                 return -1;
  98         temp[0] = '\0';
  99         *key = linepos;
 100         linepos = &temp[1];
 101
 102         /* get a quoted value */
 103         if (linepos[0] == '"' || linepos[0] == '\'') {
 104                 temp = strchr(&linepos[1], linepos[0]);
 105                 if (temp != NULL) {
 106                         temp[0] = '\0';
 107                         *value = &linepos[1];
 108                         goto out;
 109                 }
 110         }
 111
 112         /* get the value*/
 113         temp = strchr(linepos, '\n');
 114         if (temp != NULL)
 115                 temp[0] = '\0';
 116         *value = linepos;
 117 out:
 118         return 0;
 119 }
 120
 121 static int run_program(struct udev *udev, const char *command, const char *subsystem,
 122                        char *result, size_t ressize, size_t *reslen)
 123 {
 124         int status;
 125         int outpipe[2] = {-1, -1};
 126         int errpipe[2] = {-1, -1};
 127         pid_t pid;
 128         char arg[PATH_SIZE];
 129         char program[PATH_SIZE];
 130         char *argv[(sizeof(arg) / 2) + 1];
 131         int devnull;
 132         int i;
 133         int retval = 0;
 134
 135         /* build argv from comand */
 136         strlcpy(arg, command, sizeof(arg));
 137         i = 0;
 138         if (strchr(arg, ' ') != NULL) {
 139                 char *pos = arg;
 140
 141                 while (pos != NULL) {
 142                         if (pos[0] == '\'') {
 143                                 /* don't separate if in apostrophes */
 144                                 pos++;
 145                                 argv[i] = strsep(&pos, "\'");
 146                                 while (pos != NULL && pos[0] == ' ')
 147                                         pos++;
 148                         } else {
 149                                 argv[i] = strsep(&pos, " ");
 150                         }
 151                         dbg(udev, "arg[%i] '%s'\n", i, argv[i]);
 152                         i++;
 153                 }
 154                 argv[i] = NULL;
 155         } else {
 156                 argv[0] = arg;
 157                 argv[1] = NULL;
 158         }
 159         info(udev, "'%s'\n", command);
 160
 161         /* prepare pipes from child to parent */
 162         if (result != NULL || udev_get_log_priority(udev) >= LOG_INFO) {
 163                 if (pipe(outpipe) != 0) {
 164                         err(udev, "pipe failed: %s\n", strerror(errno));
 165                         return -1;
 166                 }
 167         }
 168         if (udev_get_log_priority(udev) >= LOG_INFO) {
 169                 if (pipe(errpipe) != 0) {
 170                         err(udev, "pipe failed: %s\n", strerror(errno));
 171                         return -1;
 172                 }
 173         }
 174
 175         /* allow programs in /lib/udev called without the path */
 176         if (strchr(argv[0], '/') == NULL) {
 177                 strlcpy(program, UDEV_PREFIX "/lib/udev/", sizeof(program));
 178                 strlcat(program, argv[0], sizeof(program));
 179                 argv[0] = program;
 180         }
 181
 182         pid = fork();
 183         switch(pid) {
 184         case 0:
 185                 /* child closes parent ends of pipes */
 186                 if (outpipe[READ_END] > 0)
 187                         close(outpipe[READ_END]);
 188                 if (errpipe[READ_END] > 0)
 189                         close(errpipe[READ_END]);
 190
 191                 /* discard child output or connect to pipe */
 192                 devnull = open("/dev/null", O_RDWR);
 193                 if (devnull > 0) {
 194                         dup2(devnull, STDIN_FILENO);
 195                         if (outpipe[WRITE_END] < 0)
 196                                 dup2(devnull, STDOUT_FILENO);
 197                         if (errpipe[WRITE_END] < 0)
 198                                 dup2(devnull, STDERR_FILENO);
 199                         close(devnull);
 200                 } else
 201                         err(udev, "open /dev/null failed: %s\n", strerror(errno));
 202                 if (outpipe[WRITE_END] > 0) {
 203                         dup2(outpipe[WRITE_END], STDOUT_FILENO);
 204                         close(outpipe[WRITE_END]);
 205                 }
 206                 if (errpipe[WRITE_END] > 0) {
 207                         dup2(errpipe[WRITE_END], STDERR_FILENO);
 208                         close(errpipe[WRITE_END]);
 209                 }
 210                 execv(argv[0], argv);
 211                 if (errno == ENOENT || errno == ENOTDIR) {
 212                         /* may be on a filesytem which is not mounted right now */
 213                         info(udev, "program '%s' not found\n", argv[0]);
 214                 } else {
 215                         /* other problems */
 216                         err(udev, "exec of program '%s' failed\n", argv[0]);
 217                 }
 218                 _exit(1);
 219         case -1:
 220                 err(udev, "fork of '%s' failed: %s\n", argv[0], strerror(errno));
 221                 return -1;
 222         default:
 223                 /* read from child if requested */
 224                 if (outpipe[READ_END] > 0 || errpipe[READ_END] > 0) {
 225                         ssize_t count;
 226                         size_t respos = 0;
 227
 228                         /* parent closes child ends of pipes */
 229                         if (outpipe[WRITE_END] > 0)
 230                                 close(outpipe[WRITE_END]);
 231                         if (errpipe[WRITE_END] > 0)
 232                                 close(errpipe[WRITE_END]);
 233
 234                         /* read child output */
 235                         while (outpipe[READ_END] > 0 || errpipe[READ_END] > 0) {
 236                                 int fdcount;
 237                                 fd_set readfds;
 238
 239                                 FD_ZERO(&readfds);
 240                                 if (outpipe[READ_END] > 0)
 241                                         FD_SET(outpipe[READ_END], &readfds);
 242                                 if (errpipe[READ_END] > 0)
 243                                         FD_SET(errpipe[READ_END], &readfds);
 244                                 fdcount = select(UDEV_MAX(outpipe[READ_END], errpipe[READ_END])+1, &readfds, NULL, NULL, NULL);
 245                                 if (fdcount < 0) {
 246                                         if (errno == EINTR)
 247                                                 continue;
 248                                         retval = -1;
 249                                         break;
 250                                 }
 251
 252                                 /* get stdout */
 253                                 if (outpipe[READ_END] > 0 && FD_ISSET(outpipe[READ_END], &readfds)) {
 254                                         char inbuf[1024];
 255                                         char *pos;
 256                                         char *line;
 257
 258                                         count = read(outpipe[READ_END], inbuf, sizeof(inbuf)-1);
 259                                         if (count <= 0) {
 260                                                 close(outpipe[READ_END]);
 261                                                 outpipe[READ_END] = -1;
 262                                                 if (count < 0) {
 263                                                         err(udev, "stdin read failed: %s\n", strerror(errno));
 264                                                         retval = -1;
 265                                                 }
 266                                                 continue;
 267                                         }
 268                                         inbuf[count] = '\0';
 269
 270                                         /* store result for rule processing */
 271                                         if (result) {
 272                                                 if (respos + count < ressize) {
 273                                                         memcpy(&result[respos], inbuf, count);
 274                                                         respos += count;
 275                                                 } else {
 276                                                         err(udev, "ressize %ld too short\n", (long)ressize);
 277                                                         retval = -1;
 278                                                 }
 279                                         }
 280                                         pos = inbuf;
 281                                         while ((line = strsep(&pos, "\n")))
 282                                                 if (pos || line[0] != '\0')
 283                                                         info(udev, "'%s' (stdout) '%s'\n", argv[0], line);
 284                                 }
 285
 286                                 /* get stderr */
 287                                 if (errpipe[READ_END] > 0 && FD_ISSET(errpipe[READ_END], &readfds)) {
 288                                         char errbuf[1024];
 289                                         char *pos;
 290                                         char *line;
 291
 292                                         count = read(errpipe[READ_END], errbuf, sizeof(errbuf)-1);
 293                                         if (count <= 0) {
 294                                                 close(errpipe[READ_END]);
 295                                                 errpipe[READ_END] = -1;
 296                                                 if (count < 0)
 297                                                         err(udev, "stderr read failed: %s\n", strerror(errno));
 298                                                 continue;
 299                                         }
 300                                         errbuf[count] = '\0';
 301                                         pos = errbuf;
 302                                         while ((line = strsep(&pos, "\n")))
 303                                                 if (pos || line[0] != '\0')
 304                                                         info(udev, "'%s' (stderr) '%s'\n", argv[0], line);
 305                                 }
 306                         }
 307                         if (outpipe[READ_END] > 0)
 308                                 close(outpipe[READ_END]);
 309                         if (errpipe[READ_END] > 0)
 310                                 close(errpipe[READ_END]);
 311
 312                         /* return the childs stdout string */
 313                         if (result) {
 314                                 result[respos] = '\0';
 315                                 dbg(udev, "result='%s'\n", result);
 316                                 if (reslen)
 317                                         *reslen = respos;
 318                         }
 319                 }
 320                 waitpid(pid, &status, 0);
 321                 if (WIFEXITED(status)) {
 322                         info(udev, "'%s' returned with status %i\n", argv[0], WEXITSTATUS(status));
 323                         if (WEXITSTATUS(status) != 0)
 324                                 retval = -1;
 325                 } else {
 326                         err(udev, "'%s' abnormal exit\n", argv[0]);
 327                         retval = -1;
 328                 }
 329         }
 330
 331         return retval;
 332 }
 333
 334 static int import_keys_into_env(struct udevice *udevice, const char *buf, size_t bufsize)
 335 {
 336         char line[LINE_SIZE];
 337         const char *bufline;
 338         char *linepos;
 339         char *variable;
 340         char *value;
 341         size_t cur;
 342         size_t count;
 343         int lineno;
 344
 345         /* loop through the whole buffer */
 346         lineno = 0;
 347         cur = 0;
 348         while (cur < bufsize) {
 349                 count = buf_get_line(buf, bufsize, cur);
 350                 bufline = &buf[cur];
 351                 cur += count+1;
 352                 lineno++;
 353
 354                 /* eat the whitespace */
 355                 while ((count > 0) && isspace(bufline[0])) {
 356                         bufline++;
 357                         count--;
 358                 }
 359                 if (count == 0)
 360                         continue;
 361
 362                 /* see if this is a comment */
 363                 if (bufline[0] == COMMENT_CHARACTER)
 364                         continue;
 365
 366                 if (count >= sizeof(line)) {
 367                         err(udevice->udev, "line too long, skipped\n");
 368                         continue;
 369                 }
 370
 371                 memcpy(line, bufline, count);
 372                 line[count] = '\0';
 373
 374                 linepos = line;
 375                 if (get_key(&linepos, &variable, &value) == 0) {
 376                         dbg(udevice->udev, "import '%s=%s'\n", variable, value);
 377
 378                         /* handle device, renamed by external tool, returning new path */
 379                         if (strcmp(variable, "DEVPATH") == 0) {
 380                                 info(udevice->udev, "updating devpath from '%s' to '%s'\n", udevice->dev->devpath, value);
 381                                 sysfs_device_set_values(udevice->udev, udevice->dev, value, NULL, NULL);
 382                         } else
 383                                 name_list_key_add(udevice->udev, &udevice->env_list, variable, value);
 384                         setenv(variable, value, 1);
 385                 }
 386         }
 387
 388         return 0;
 389 }
 390
 391 static int import_file_into_env(struct udevice *udevice, const char *filename)
 392 {
 393         char *buf;
 394         size_t bufsize;
 395
 396         if (file_map(filename, &buf, &bufsize) != 0) {
 397                 err(udevice->udev, "can't open '%s': %s\n", filename, strerror(errno));
 398                 return -1;
 399         }
 400         import_keys_into_env(udevice, buf, bufsize);
 401         file_unmap(buf, bufsize);
 402
 403         return 0;
 404 }
 405
 406 static int import_program_into_env(struct udevice *udevice, const char *program)
 407 {
 408         char result[2048];
 409         size_t reslen;
 410
 411         if (run_program(udevice->udev, program, udevice->dev->subsystem, result, sizeof(result), &reslen) != 0)
 412                 return -1;
 413         return import_keys_into_env(udevice, result, reslen);
 414 }
 415
 416 static int import_parent_into_env(struct udevice *udevice, const char *filter)
 417 {
 418         struct sysfs_device *dev_parent;
 419         int rc = -1;
 420
 421         dev_parent = sysfs_device_get_parent(udevice->udev, udevice->dev);
 422         if (dev_parent != NULL) {
 423                 struct udevice *udev_parent;
 424                 struct name_entry *name_loop;
 425
 426                 dbg(udevice->udev, "found parent '%s', get the node name\n", dev_parent->devpath);
 427                 udev_parent = udev_device_init(udevice->udev);
 428                 if (udev_parent == NULL)
 429                         return -1;
 430                 /* import the udev_db of the parent */
 431                 if (udev_db_get_device(udev_parent, dev_parent->devpath) == 0) {
 432                         dbg(udevice->udev, "import stored parent env '%s'\n", udev_parent->name);
 433                         list_for_each_entry(name_loop, &udev_parent->env_list, node) {
 434                                 char name[NAME_SIZE];
 435                                 char *pos;
 436
 437                                 strlcpy(name, name_loop->name, sizeof(name));
 438                                 pos = strchr(name, '=');
 439                                 if (pos) {
 440                                         pos[0] = '\0';
 441                                         pos++;
 442                                         if (fnmatch(filter, name, 0) == 0) {
 443                                                 dbg(udevice->udev, "import key '%s'\n", name_loop->name);
 444                                                 name_list_add(udevice->udev, &udevice->env_list, name_loop->name, 0);
 445                                                 setenv(name, pos, 1);
 446                                         } else
 447                                                 dbg(udevice->udev, "skip key '%s'\n", name_loop->name);
 448                                 }
 449                         }
 450                         rc = 0;
 451                 } else
 452                         dbg(udevice->udev, "parent not found in database\n");
 453                 udev_device_cleanup(udev_parent);
 454         }
 455
 456         return rc;
 457 }
 458
 459 static int pass_env_to_socket(struct udev *udev, const char *sockpath, const char *devpath, const char *action)
 460 {
 461         int sock;
 462         struct sockaddr_un saddr;
 463         socklen_t saddrlen;
 464         struct stat stats;
 465         char buf[2048];
 466         size_t bufpos = 0;
 467         int i;
 468         ssize_t count;
 469         int retval = 0;
 470
 471         dbg(udev, "pass environment to socket '%s'\n", sockpath);
 472         sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
 473         memset(&saddr, 0x00, sizeof(struct sockaddr_un));
 474         saddr.sun_family = AF_LOCAL;
 475         if (sockpath[0] == '@') {
 476                 /* abstract namespace socket requested */
 477                 strlcpy(&saddr.sun_path[1], &sockpath[1], sizeof(saddr.sun_path)-1);
 478                 saddrlen = offsetof(struct sockaddr_un, sun_path) + 1 + strlen(&saddr.sun_path[1]);
 479         } else if (stat(sockpath, &stats) == 0 && S_ISSOCK(stats.st_mode)) {
 480                 /* existing socket file */
 481                 strlcpy(saddr.sun_path, sockpath, sizeof(saddr.sun_path));
 482                 saddrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path);
 483         } else {
 484                 /* no socket file, assume abstract namespace socket */
 485                 strlcpy(&saddr.sun_path[1], sockpath, sizeof(saddr.sun_path)-1);
 486                 saddrlen = offsetof(struct sockaddr_un, sun_path) + 1 + strlen(&saddr.sun_path[1]);
 487         }
 488
 489         bufpos = snprintf(buf, sizeof(buf)-1, "%s@%s", action, devpath);
 490         bufpos++;
 491         for (i = 0; environ[i] != NULL && bufpos < (sizeof(buf)-1); i++) {
 492                 bufpos += strlcpy(&buf[bufpos], environ[i], sizeof(buf) - bufpos-1);
 493                 bufpos++;
 494         }
 495         if (bufpos > sizeof(buf))
 496                 bufpos = sizeof(buf);
 497
 498         count = sendto(sock, &buf, bufpos, 0, (struct sockaddr *)&saddr, saddrlen);
 499         if (count < 0)
 500                 retval = -1;
 501         info(udev, "passed %zi bytes to socket '%s', \n", count, sockpath);
 502
 503         close(sock);
 504         return retval;
 505 }
 506
 507 int udev_rules_run(struct udevice *udevice)
 508 {
 509         struct name_entry *name_loop;
 510         int retval = 0;
 511
 512         dbg(udevice->udev, "executing run list\n");
 513         list_for_each_entry(name_loop, &udevice->run_list, node) {
 514                 if (strncmp(name_loop->name, "socket:", strlen("socket:")) == 0) {
 515                         pass_env_to_socket(udevice->udev, &name_loop->name[strlen("socket:")], udevice->dev->devpath, udevice->action);
 516                 } else {
 517                         char program[PATH_SIZE];
 518
 519                         strlcpy(program, name_loop->name, sizeof(program));
 520                         udev_rules_apply_format(udevice, program, sizeof(program));
 521                         if (run_program(udevice->udev, program, udevice->dev->subsystem, NULL, 0, NULL) != 0)
 522                                 if (!name_loop->ignore_error)
 523                                         retval = -1;
 524                 }
 525         }
 526
 527         return retval;
 528 }
 529
 530 #define WAIT_LOOP_PER_SECOND            50
 531 static int wait_for_file(struct udevice *udevice, const char *file, int timeout)
 532 {
 533         char filepath[PATH_SIZE];
 534         char devicepath[PATH_SIZE] = "";
 535         struct stat stats;
 536         int loop = timeout * WAIT_LOOP_PER_SECOND;
 537
 538         /* a relative path is a device attribute */
 539         if (file[0] != '/') {
 540                 strlcpy(devicepath, udev_get_sys_path(udevice->udev), sizeof(devicepath));
 541                 strlcat(devicepath, udevice->dev->devpath, sizeof(devicepath));
 542
 543                 strlcpy(filepath, devicepath, sizeof(filepath));
 544                 strlcat(filepath, "/", sizeof(filepath));
 545                 strlcat(filepath, file, sizeof(filepath));
 546                 file = filepath;
 547         }
 548
 549         dbg(udevice->udev, "will wait %i sec for '%s'\n", timeout, file);
 550         while (--loop) {
 551                 /* lookup file */
 552                 if (stat(file, &stats) == 0) {
 553                         info(udevice->udev, "file '%s' appeared after %i loops\n", file, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
 554                         return 0;
 555                 }
 556                 /* make sure, the device did not disappear in the meantime */
 557                 if (devicepath[0] != '\0' && stat(devicepath, &stats) != 0) {
 558                         info(udevice->udev, "device disappeared while waiting for '%s'\n", file);
 559                         return -2;
 560                 }
 561                 info(udevice->udev, "wait for '%s' for %i mseconds\n", file, 1000 / WAIT_LOOP_PER_SECOND);
 562                 usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
 563         }
 564         info(udevice->udev, "waiting for '%s' failed\n", file);
 565         return -1;
 566 }
 567
 568 /* handle "[$SUBSYSTEM/$KERNEL]<attribute>" lookup */
 569 static int attr_get_by_subsys_id(struct udev *udev, const char *attrstr, char *devpath, size_t len, char **attr)
 570 {
 571         char subsys[NAME_SIZE];
 572         char *pos;
 573         char *id;
 574         char *attrib;
 575         int found = 0;
 576
 577         if (attrstr[0] != '[')
 578                 goto out;
 579
 580         attrib = strchr(&attrstr[1], ']');
 581         if (attrib == NULL)
 582                 goto out;
 583         attrib = &attrib[1];
 584
 585         strlcpy(subsys, &attrstr[1], sizeof(subsys));
 586         pos = strchr(subsys, ']');
 587         if (pos == NULL)
 588                 goto out;
 589         pos[0] = '\0';
 590         id = strchr(subsys, '/');
 591         if (id == NULL)
 592                 goto out;
 593         id[0] = '\0';
 594         id = &id[1];
 595         if (sysfs_lookup_devpath_by_subsys_id(udev, devpath, len, subsys, id)) {
 596                 if (attr != NULL) {
 597                         if (attrib[0] != '\0')
 598                                 *attr = attrib;
 599                         else
 600                                 *attr = NULL;
 601                 }
 602                 found = 1;
 603         }
 604 out:
 605         return found;
 606 }
 607
 608 static int attr_subst_subdir(char *attr, size_t len)
 609 {
 610         char *pos;
 611         int found = 0;
 612
 613         pos = strstr(attr, "/*/");
 614         if (pos != NULL) {
 615                 char str[PATH_SIZE];
 616                 DIR *dir;
 617
 618                 pos[1] = '\0';
 619                 strlcpy(str, &pos[2], sizeof(str));
 620                 dir = opendir(attr);
 621                 if (dir != NULL) {
 622                         struct dirent *dent;
 623
 624                         for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 625                                 struct stat stats;
 626
 627                                 if (dent->d_name[0] == '.')
 628                                         continue;
 629                                 strlcat(attr, dent->d_name, len);
 630                                 strlcat(attr, str, len);
 631                                 if (stat(attr, &stats) == 0) {
 632                                         found = 1;
 633                                         break;
 634                                 }
 635                                 pos[1] = '\0';
 636                         }
 637                         closedir(dir);
 638                 }
 639                 if (!found)
 640                         strlcat(attr, str, len);
 641         }
 642
 643         return found;
 644 }
 645
 646 void udev_rules_apply_format(struct udevice *udevice, char *string, size_t maxsize)
 647 {
 648         char temp[PATH_SIZE];
 649         char temp2[PATH_SIZE];
 650         char *head, *tail, *pos, *cpos, *attr, *rest;
 651         int len;
 652         int i;
 653         int count;
 654         enum subst_type {
 655                 SUBST_UNKNOWN,
 656                 SUBST_DEVPATH,
 657                 SUBST_KERNEL,
 658                 SUBST_KERNEL_NUMBER,
 659                 SUBST_ID,
 660                 SUBST_DRIVER,
 661                 SUBST_MAJOR,
 662                 SUBST_MINOR,
 663                 SUBST_RESULT,
 664                 SUBST_ATTR,
 665                 SUBST_PARENT,
 666                 SUBST_TEMP_NODE,
 667                 SUBST_NAME,
 668                 SUBST_LINKS,
 669                 SUBST_ROOT,
 670                 SUBST_SYS,
 671                 SUBST_ENV,
 672         };
 673         static const struct subst_map {
 674                 char *name;
 675                 char fmt;
 676                 enum subst_type type;
 677         } map[] = {
 678                 { .name = "devpath",    .fmt = 'p',     .type = SUBST_DEVPATH },
 679                 { .name = "number",     .fmt = 'n',     .type = SUBST_KERNEL_NUMBER },
 680                 { .name = "kernel",     .fmt = 'k',     .type = SUBST_KERNEL },
 681                 { .name = "id",         .fmt = 'b',     .type = SUBST_ID },
 682                 { .name = "driver",     .fmt = 'd',     .type = SUBST_DRIVER },
 683                 { .name = "major",      .fmt = 'M',     .type = SUBST_MAJOR },
 684                 { .name = "minor",      .fmt = 'm',     .type = SUBST_MINOR },
 685                 { .name = "result",     .fmt = 'c',     .type = SUBST_RESULT },
 686                 { .name = "attr",       .fmt = 's',     .type = SUBST_ATTR },
 687                 { .name = "sysfs",      .fmt = 's',     .type = SUBST_ATTR },
 688                 { .name = "parent",     .fmt = 'P',     .type = SUBST_PARENT },
 689                 { .name = "tempnode",   .fmt = 'N',     .type = SUBST_TEMP_NODE },
 690                 { .name = "name",       .fmt = 'D',     .type = SUBST_NAME },
 691                 { .name = "links",      .fmt = 'L',     .type = SUBST_LINKS },
 692                 { .name = "root",       .fmt = 'r',     .type = SUBST_ROOT },
 693                 { .name = "sys",        .fmt = 'S',     .type = SUBST_SYS },
 694                 { .name = "env",        .fmt = 'E',     .type = SUBST_ENV },
 695                 { NULL, '\0', 0 }
 696         };
 697         enum subst_type type;
 698         const struct subst_map *subst;
 699
 700         head = string;
 701         while (1) {
 702                 len = -1;
 703                 while (head[0] != '\0') {
 704                         if (head[0] == '$') {
 705                                 /* substitute named variable */
 706                                 if (head[1] == '\0')
 707                                         break;
 708                                 if (head[1] == '$') {
 709                                         strlcpy(temp, head+2, sizeof(temp));
 710                                         strlcpy(head+1, temp, maxsize);
 711                                         head++;
 712                                         continue;
 713                                 }
 714                                 head[0] = '\0';
 715                                 for (subst = map; subst->name; subst++) {
 716                                         if (strncasecmp(&head[1], subst->name, strlen(subst->name)) == 0) {
 717                                                 type = subst->type;
 718                                                 tail = head + strlen(subst->name)+1;
 719                                                 dbg(udevice->udev, "will substitute format name '%s'\n", subst->name);
 720                                                 goto found;
 721                                         }
 722                                 }
 723                                 head[0] = '$';
 724                                 err(udevice->udev, "unknown format variable '%s'\n", head);
 725                         } else if (head[0] == '%') {
 726                                 /* substitute format char */
 727                                 if (head[1] == '\0')
 728                                         break;
 729                                 if (head[1] == '%') {
 730                                         strlcpy(temp, head+2, sizeof(temp));
 731                                         strlcpy(head+1, temp, maxsize);
 732                                         head++;
 733                                         continue;
 734                                 }
 735                                 head[0] = '\0';
 736                                 tail = head+1;
 737                                 len = get_format_len(udevice->udev, &tail);
 738                                 for (subst = map; subst->name; subst++) {
 739                                         if (tail[0] == subst->fmt) {
 740                                                 type = subst->type;
 741                                                 tail++;
 742                                                 dbg(udevice->udev, "will substitute format char '%c'\n", subst->fmt);
 743                                                 goto found;
 744                                         }
 745                                 }
 746                                 head[0] = '%';
 747                                 err(udevice->udev, "unknown format char '%c'\n", tail[0]);
 748                         }
 749                         head++;
 750                 }
 751                 break;
 752 found:
 753                 attr = get_format_attribute(udevice->udev, &tail);
 754                 strlcpy(temp, tail, sizeof(temp));
 755                 dbg(udevice->udev, "format=%i, string='%s', tail='%s'\n", type ,string, tail);
 756
 757                 switch (type) {
 758                 case SUBST_DEVPATH:
 759                         strlcat(string, udevice->dev->devpath, maxsize);
 760                         dbg(udevice->udev, "substitute devpath '%s'\n", udevice->dev->devpath);
 761                         break;
 762                 case SUBST_KERNEL:
 763                         strlcat(string, udevice->dev->kernel, maxsize);
 764                         dbg(udevice->udev, "substitute kernel name '%s'\n", udevice->dev->kernel);
 765                         break;
 766                 case SUBST_KERNEL_NUMBER:
 767                         strlcat(string, udevice->dev->kernel_number, maxsize);
 768                         dbg(udevice->udev, "substitute kernel number '%s'\n", udevice->dev->kernel_number);
 769                         break;
 770                 case SUBST_ID:
 771                         if (udevice->dev_parent != NULL) {
 772                                 strlcat(string, udevice->dev_parent->kernel, maxsize);
 773                                 dbg(udevice->udev, "substitute id '%s'\n", udevice->dev_parent->kernel);
 774                         }
 775                         break;
 776                 case SUBST_DRIVER:
 777                         if (udevice->dev_parent != NULL) {
 778                                 strlcat(string, udevice->dev_parent->driver, maxsize);
 779                                 dbg(udevice->udev, "substitute driver '%s'\n", udevice->dev_parent->driver);
 780                         }
 781                         break;
 782                 case SUBST_MAJOR:
 783                         sprintf(temp2, "%d", major(udevice->devt));
 784                         strlcat(string, temp2, maxsize);
 785                         dbg(udevice->udev, "substitute major number '%s'\n", temp2);
 786                         break;
 787                 case SUBST_MINOR:
 788                         sprintf(temp2, "%d", minor(udevice->devt));
 789                         strlcat(string, temp2, maxsize);
 790                         dbg(udevice->udev, "substitute minor number '%s'\n", temp2);
 791                         break;
 792                 case SUBST_RESULT:
 793                         if (udevice->program_result[0] == '\0')
 794                                 break;
 795                         /* get part part of the result string */
 796                         i = 0;
 797                         if (attr != NULL)
 798                                 i = strtoul(attr, &rest, 10);
 799                         if (i > 0) {
 800                                 dbg(udevice->udev, "request part #%d of result string\n", i);
 801                                 cpos = udevice->program_result;
 802                                 while (--i) {
 803                                         while (cpos[0] != '\0' && !isspace(cpos[0]))
 804                                                 cpos++;
 805                                         while (isspace(cpos[0]))
 806                                                 cpos++;
 807                                 }
 808                                 if (i > 0) {
 809                                         err(udevice->udev, "requested part of result string not found\n");
 810                                         break;
 811                                 }
 812                                 strlcpy(temp2, cpos, sizeof(temp2));
 813                                 /* %{2+}c copies the whole string from the second part on */
 814                                 if (rest[0] != '+') {
 815                                         cpos = strchr(temp2, ' ');
 816                                         if (cpos)
 817                                                 cpos[0] = '\0';
 818                                 }
 819                                 strlcat(string, temp2, maxsize);
 820                                 dbg(udevice->udev, "substitute part of result string '%s'\n", temp2);
 821                         } else {
 822                                 strlcat(string, udevice->program_result, maxsize);
 823                                 dbg(udevice->udev, "substitute result string '%s'\n", udevice->program_result);
 824                         }
 825                         break;
 826                 case SUBST_ATTR:
 827                         if (attr == NULL)
 828                                 err(udevice->udev, "missing file parameter for attr\n");
 829                         else {
 830                                 char devpath[PATH_SIZE];
 831                                 char *attrib;
 832                                 const char *value = NULL;
 833                                 size_t size;
 834
 835                                 if (attr_get_by_subsys_id(udevice->udev, attr, devpath, sizeof(devpath), &attrib)) {
 836                                         if (attrib != NULL)
 837                                                 value = sysfs_attr_get_value(udevice->udev, devpath, attrib);
 838                                         else
 839                                                 break;
 840                                 }
 841
 842                                 /* try the current device, other matches may have selected */
 843                                 if (value == NULL && udevice->dev_parent != NULL && udevice->dev_parent != udevice->dev)
 844                                         value = sysfs_attr_get_value(udevice->udev, udevice->dev_parent->devpath, attr);
 845
 846                                 /* look at all devices along the chain of parents */
 847                                 if (value == NULL) {
 848                                         struct sysfs_device *dev_parent = udevice->dev;
 849
 850                                         do {
 851                                                 dbg(udevice->udev, "looking at '%s'\n", dev_parent->devpath);
 852                                                 value = sysfs_attr_get_value(udevice->udev, dev_parent->devpath, attr);
 853                                                 if (value != NULL) {
 854                                                         strlcpy(temp2, value, sizeof(temp2));
 855                                                         break;
 856                                                 }
 857                                                 dev_parent = sysfs_device_get_parent(udevice->udev, dev_parent);
 858                                         } while (dev_parent != NULL);
 859                                 }
 860
 861                                 if (value == NULL)
 862                                         break;
 863
 864                                 /* strip trailing whitespace, and replace unwanted characters */
 865                                 size = strlcpy(temp2, value, sizeof(temp2));
 866                                 if (size >= sizeof(temp2))
 867                                         size = sizeof(temp2)-1;
 868                                 while (size > 0 && isspace(temp2[size-1]))
 869                                         temp2[--size] = '\0';
 870                                 count = replace_chars(temp2, ALLOWED_CHARS_INPUT);
 871                                 if (count > 0)
 872                                         info(udevice->udev, "%i character(s) replaced\n" , count);
 873                                 strlcat(string, temp2, maxsize);
 874                                 dbg(udevice->udev, "substitute sysfs value '%s'\n", temp2);
 875                         }
 876                         break;
 877                 case SUBST_PARENT:
 878                         {
 879                                 struct sysfs_device *dev_parent;
 880
 881                                 dev_parent = sysfs_device_get_parent(udevice->udev, udevice->dev);
 882                                 if (dev_parent != NULL) {
 883                                         struct udevice *udev_parent;
 884
 885                                         dbg(udevice->udev, "found parent '%s', get the node name\n", dev_parent->devpath);
 886                                         udev_parent = udev_device_init(udevice->udev);
 887                                         if (udev_parent != NULL) {
 888                                                 /* lookup the name in the udev_db with the DEVPATH of the parent */
 889                                                 if (udev_db_get_device(udev_parent, dev_parent->devpath) == 0) {
 890                                                         strlcat(string, udev_parent->name, maxsize);
 891                                                         dbg(udevice->udev, "substitute parent node name'%s'\n", udev_parent->name);
 892                                                 } else
 893                                                         dbg(udevice->udev, "parent not found in database\n");
 894                                                 udev_device_cleanup(udev_parent);
 895                                         }
 896                                 }
 897                         }
 898                         break;
 899                 case SUBST_TEMP_NODE:
 900                         if (udevice->tmp_node[0] == '\0' && major(udevice->devt) > 0) {
 901                                 dbg(udevice->udev, "create temporary device node for callout\n");
 902                                 snprintf(udevice->tmp_node, sizeof(udevice->tmp_node), "%s/.tmp-%u-%u",
 903                                          udev_get_dev_path(udevice->udev), major(udevice->devt), minor(udevice->devt));
 904                                 udevice->tmp_node[sizeof(udevice->tmp_node)-1] = '\0';
 905                                 udev_node_mknod(udevice, udevice->tmp_node, udevice->devt, 0600, 0, 0);
 906                         }
 907                         strlcat(string, udevice->tmp_node, maxsize);
 908                         dbg(udevice->udev, "substitute temporary device node name '%s'\n", udevice->tmp_node);
 909                         break;
 910                 case SUBST_NAME:
 911                         if (udevice->name[0] == '\0') {
 912                                 strlcat(string, udevice->dev->kernel, maxsize);
 913                                 dbg(udevice->udev, "substitute udevice->kernel '%s'\n", udevice->name);
 914                         } else {
 915                                 strlcat(string, udevice->name, maxsize);
 916                                 dbg(udevice->udev, "substitute udevice->name '%s'\n", udevice->name);
 917                         }
 918                         break;
 919                 case SUBST_LINKS:
 920                         if (!list_empty(&udevice->symlink_list)) {
 921                                 struct name_entry *name_loop;
 922                                 char symlinks[PATH_SIZE] = "";
 923
 924                                 list_for_each_entry(name_loop, &udevice->symlink_list, node) {
 925                                         strlcat(symlinks, name_loop->name, sizeof(symlinks));
 926                                         strlcat(symlinks, " ", sizeof(symlinks));
 927                                 }
 928                                 remove_trailing_chars(symlinks, ' ');
 929                                 strlcat(string, symlinks, maxsize);
 930                         }
 931                         break;
 932                 case SUBST_ROOT:
 933                         strlcat(string, udev_get_dev_path(udevice->udev), maxsize);
 934                         dbg(udevice->udev, "substitute udev_root '%s'\n", udev_get_dev_path(udevice->udev));
 935                         break;
 936                 case SUBST_SYS:
 937                         strlcat(string, udev_get_sys_path(udevice->udev), maxsize);
 938                         dbg(udevice->udev, "substitute sys_path '%s'\n", udev_get_sys_path(udevice->udev));
 939                         break;
 940                 case SUBST_ENV:
 941                         if (attr == NULL) {
 942                                 dbg(udevice->udev, "missing attribute\n");
 943                                 break;
 944                         }
 945                         pos = getenv(attr);
 946                         if (pos == NULL) {
 947                                 dbg(udevice->udev, "env '%s' not available\n", attr);
 948                                 break;
 949                         }
 950                         dbg(udevice->udev, "substitute env '%s=%s'\n", attr, pos);
 951                         strlcat(string, pos, maxsize);
 952                         break;
 953                 default:
 954                         err(udevice->udev, "unknown substitution type=%i\n", type);
 955                         break;
 956                 }
 957                 /* possibly truncate to format-char specified length */
 958                 if (len >= 0 && len < (int)strlen(head)) {
 959                         head[len] = '\0';
 960                         dbg(udevice->udev, "truncate to %i chars, subtitution string becomes '%s'\n", len, head);
 961                 }
 962                 strlcat(string, temp, maxsize);
 963         }
 964 }
 965
 966 static char *key_val(struct udev_rule *rule, struct key *key)
 967 {
 968         return rule->buf + key->val_off;
 969 }
 970
 971 static char *key_pair_name(struct udev_rule *rule, struct key_pair *pair)
 972 {
 973         return rule->buf + pair->key_name_off;
 974 }
 975
 976 static int match_key(struct udev *udev, const char *key_name, struct udev_rule *rule, struct key *key, const char *val)
 977 {
 978         char value[PATH_SIZE];
 979         char *key_value;
 980         char *pos;
 981         int match = 0;
 982
 983         if (key->operation != KEY_OP_MATCH &&
 984             key->operation != KEY_OP_NOMATCH)
 985                 return 0;
 986
 987         /* look for a matching string, parts are separated by '|' */
 988         strlcpy(value, rule->buf + key->val_off, sizeof(value));
 989         key_value = value;
 990         dbg(udev, "key %s value='%s'\n", key_name, key_value);
 991         while (key_value) {
 992                 pos = strchr(key_value, '|');
 993                 if (pos) {
 994                         pos[0] = '\0';
 995                         pos++;
 996                 }
 997
 998                 dbg(udev, "match %s '%s' <-> '%s'\n", key_name, key_value, val);
 999                 match = (fnmatch(key_value, val, 0) == 0);
1000                 if (match)
1001                         break;
1002
1003                 key_value = pos;
1004         }
1005
1006         if (match && (key->operation == KEY_OP_MATCH)) {
1007                 dbg(udev, "%s is true (matching value)\n", key_name);
1008                 return 0;
1009         }
1010         if (!match && (key->operation == KEY_OP_NOMATCH)) {
1011                 dbg(udev, "%s is true (non-matching value)\n", key_name);
1012                 return 0;
1013         }
1014         return -1;
1015 }
1016
1017 /* match a single rule against a given device and possibly its parent devices */
1018 static int match_rule(struct udevice *udevice, struct udev_rule *rule)
1019 {
1020         int i;
1021
1022         if (match_key(udevice->udev, "ACTION", rule, &rule->action, udevice->action))
1023                 goto nomatch;
1024
1025         if (match_key(udevice->udev, "KERNEL", rule, &rule->kernel, udevice->dev->kernel))
1026                 goto nomatch;
1027
1028         if (match_key(udevice->udev, "SUBSYSTEM", rule, &rule->subsystem, udevice->dev->subsystem))
1029                 goto nomatch;
1030
1031         if (match_key(udevice->udev, "DEVPATH", rule, &rule->devpath, udevice->dev->devpath))
1032                 goto nomatch;
1033
1034         if (match_key(udevice->udev, "DRIVER", rule, &rule->driver, udevice->dev->driver))
1035                 goto nomatch;
1036
1037         /* match NAME against a value assigned by an earlier rule */
1038         if (match_key(udevice->udev, "NAME", rule, &rule->name, udevice->name))
1039                 goto nomatch;
1040
1041         /* match against current list of symlinks */
1042         if (rule->symlink_match.operation == KEY_OP_MATCH ||
1043             rule->symlink_match.operation == KEY_OP_NOMATCH) {
1044                 struct name_entry *name_loop;
1045                 int match = 0;
1046
1047                 list_for_each_entry(name_loop, &udevice->symlink_list, node) {
1048                         if (match_key(udevice->udev, "SYMLINK", rule, &rule->symlink_match, name_loop->name) == 0) {
1049                                 match = 1;
1050                                 break;
1051                         }
1052                 }
1053                 if (!match)
1054                         goto nomatch;
1055         }
1056
1057         for (i = 0; i < rule->env.count; i++) {
1058                 struct key_pair *pair = &rule->env.keys[i];
1059
1060                 /* we only check for matches, assignments will be handled later */
1061                 if (pair->key.operation == KEY_OP_MATCH ||
1062                     pair->key.operation == KEY_OP_NOMATCH) {
1063                         const char *key_name = key_pair_name(rule, pair);
1064                         const char *value = getenv(key_name);
1065
1066                         if (!value) {
1067                                 dbg(udevice->udev, "ENV{'%s'} is not set, treat as empty\n", key_name);
1068                                 value = "";
1069                         }
1070                         if (match_key(udevice->udev, "ENV", rule, &pair->key, value))
1071                                 goto nomatch;
1072                 }
1073         }
1074
1075         if (rule->test.operation == KEY_OP_MATCH ||
1076             rule->test.operation == KEY_OP_NOMATCH) {
1077                 char filename[PATH_SIZE];
1078                 char devpath[PATH_SIZE];
1079                 char *attr;
1080                 struct stat statbuf;
1081                 int match;
1082
1083                 strlcpy(filename, key_val(rule, &rule->test), sizeof(filename));
1084                 udev_rules_apply_format(udevice, filename, sizeof(filename));
1085
1086                 if (attr_get_by_subsys_id(udevice->udev, filename, devpath, sizeof(devpath), &attr)) {
1087                         strlcpy(filename, udev_get_sys_path(udevice->udev), sizeof(filename));
1088                         strlcat(filename, devpath, sizeof(filename));
1089                         if (attr != NULL) {
1090                                 strlcat(filename, "/", sizeof(filename));
1091                                 strlcat(filename, attr, sizeof(filename));
1092                         }
1093                 } else if (filename[0] != '/') {
1094                         char tmp[PATH_SIZE];
1095
1096                         strlcpy(tmp, udev_get_sys_path(udevice->udev), sizeof(tmp));
1097                         strlcat(tmp, udevice->dev->devpath, sizeof(tmp));
1098                         strlcat(tmp, "/", sizeof(tmp));
1099                         strlcat(tmp, filename, sizeof(tmp));
1100                         strlcpy(filename, tmp, sizeof(filename));
1101                 }
1102
1103                 attr_subst_subdir(filename, sizeof(filename));
1104
1105                 match = (stat(filename, &statbuf) == 0);
1106                 info(udevice->udev, "'%s' %s", filename, match ? "exists\n" : "does not exist\n");
1107                 if (match && rule->test_mode_mask > 0) {
1108                         match = ((statbuf.st_mode & rule->test_mode_mask) > 0);
1109                         info(udevice->udev, "'%s' has mode=%#o and %s %#o\n", filename, statbuf.st_mode,
1110                              match ? "matches" : "does not match",
1111                              rule->test_mode_mask);
1112                 }
1113                 if (match && rule->test.operation == KEY_OP_NOMATCH)
1114                         goto nomatch;
1115                 if (!match && rule->test.operation == KEY_OP_MATCH)
1116                         goto nomatch;
1117                 dbg(udevice->udev, "TEST key is true\n");
1118         }
1119
1120         if (rule->wait_for.operation != KEY_OP_UNSET) {
1121                 char filename[PATH_SIZE];
1122                 int found;
1123
1124                 strlcpy(filename, key_val(rule, &rule->wait_for), sizeof(filename));
1125                 udev_rules_apply_format(udevice, filename, sizeof(filename));
1126                 found = (wait_for_file(udevice, filename, 10) == 0);
1127                 if (!found && (rule->wait_for.operation != KEY_OP_NOMATCH))
1128                         goto nomatch;
1129         }
1130
1131         /* check for matching sysfs attribute pairs */
1132         for (i = 0; i < rule->attr.count; i++) {
1133                 struct key_pair *pair = &rule->attr.keys[i];
1134
1135                 if (pair->key.operation == KEY_OP_MATCH ||
1136                     pair->key.operation == KEY_OP_NOMATCH) {
1137                         const char *key_name = key_pair_name(rule, pair);
1138                         const char *key_value = key_val(rule, &pair->key);
1139                         char devpath[PATH_SIZE];
1140                         char *attrib;
1141                         const char *value = NULL;
1142                         char val[VALUE_SIZE];
1143                         size_t len;
1144
1145                         if (attr_get_by_subsys_id(udevice->udev, key_name, devpath, sizeof(devpath), &attrib)) {
1146                                 if (attrib != NULL)
1147                                         value = sysfs_attr_get_value(udevice->udev, devpath, attrib);
1148                                 else
1149                                         goto nomatch;
1150                         }
1151                         if (value == NULL)
1152                                 value = sysfs_attr_get_value(udevice->udev, udevice->dev->devpath, key_name);
1153                         if (value == NULL)
1154                                 goto nomatch;
1155                         strlcpy(val, value, sizeof(val));
1156
1157                         /* strip trailing whitespace of value, if not asked to match for it */
1158                         len = strlen(key_value);
1159                         if (len > 0 && !isspace(key_value[len-1])) {
1160                                 len = strlen(val);
1161                                 while (len > 0 && isspace(val[len-1]))
1162                                         val[--len] = '\0';
1163                                 dbg(udevice->udev, "removed %zi trailing whitespace chars from '%s'\n", strlen(val)-len, val);
1164                         }
1165
1166                         if (match_key(udevice->udev, "ATTR", rule, &pair->key, val))
1167                                 goto nomatch;
1168                 }
1169         }
1170
1171         /* walk up the chain of parent devices and find a match */
1172         udevice->dev_parent = udevice->dev;
1173         while (1) {
1174                 /* check for matching kernel device name */
1175                 if (match_key(udevice->udev, "KERNELS", rule, &rule->kernels, udevice->dev_parent->kernel))
1176                         goto try_parent;
1177
1178                 /* check for matching subsystem value */
1179                 if (match_key(udevice->udev, "SUBSYSTEMS", rule, &rule->subsystems, udevice->dev_parent->subsystem))
1180                         goto try_parent;
1181
1182                 /* check for matching driver */
1183                 if (match_key(udevice->udev, "DRIVERS", rule, &rule->drivers, udevice->dev_parent->driver))
1184                         goto try_parent;
1185
1186                 /* check for matching sysfs attribute pairs */
1187                 for (i = 0; i < rule->attrs.count; i++) {
1188                         struct key_pair *pair = &rule->attrs.keys[i];
1189
1190                         if (pair->key.operation == KEY_OP_MATCH ||
1191                             pair->key.operation == KEY_OP_NOMATCH) {
1192                                 const char *key_name = key_pair_name(rule, pair);
1193                                 const char *key_value = key_val(rule, &pair->key);
1194                                 const char *value;
1195                                 char val[VALUE_SIZE];
1196                                 size_t len;
1197
1198                                 value = sysfs_attr_get_value(udevice->udev, udevice->dev_parent->devpath, key_name);
1199                                 if (value == NULL)
1200                                         value = sysfs_attr_get_value(udevice->udev, udevice->dev->devpath, key_name);
1201                                 if (value == NULL)
1202                                         goto try_parent;
1203                                 strlcpy(val, value, sizeof(val));
1204
1205                                 /* strip trailing whitespace of value, if not asked to match for it */
1206                                 len = strlen(key_value);
1207                                 if (len > 0 && !isspace(key_value[len-1])) {
1208                                         len = strlen(val);
1209                                         while (len > 0 && isspace(val[len-1]))
1210                                                 val[--len] = '\0';
1211                                         dbg(udevice->udev, "removed %zi trailing whitespace chars from '%s'\n", strlen(val)-len, val);
1212                                 }
1213
1214                                 if (match_key(udevice->udev, "ATTRS", rule, &pair->key, val))
1215                                         goto try_parent;
1216                         }
1217                 }
1218
1219                 /* found matching device  */
1220                 break;
1221 try_parent:
1222                 /* move to parent device */
1223                 dbg(udevice->udev, "try parent sysfs device\n");
1224                 udevice->dev_parent = sysfs_device_get_parent(udevice->udev, udevice->dev_parent);
1225                 if (udevice->dev_parent == NULL)
1226                         goto nomatch;
1227                 dbg(udevice->udev, "looking at dev_parent->devpath='%s'\n", udevice->dev_parent->devpath);
1228                 dbg(udevice->udev, "looking at dev_parent->kernel='%s'\n", udevice->dev_parent->kernel);
1229         }
1230
1231         /* execute external program */
1232         if (rule->program.operation != KEY_OP_UNSET) {
1233                 char program[PATH_SIZE];
1234                 char result[PATH_SIZE];
1235
1236                 strlcpy(program, key_val(rule, &rule->program), sizeof(program));
1237                 udev_rules_apply_format(udevice, program, sizeof(program));
1238                 if (run_program(udevice->udev, program, udevice->dev->subsystem, result, sizeof(result), NULL) != 0) {
1239                         dbg(udevice->udev, "PROGRAM is false\n");
1240                         udevice->program_result[0] = '\0';
1241                         if (rule->program.operation != KEY_OP_NOMATCH)
1242                                 goto nomatch;
1243                 } else {
1244                         int count;
1245
1246                         dbg(udevice->udev, "PROGRAM matches\n");
1247                         remove_trailing_chars(result, '\n');
1248                         if (rule->string_escape == ESCAPE_UNSET ||
1249                             rule->string_escape == ESCAPE_REPLACE) {
1250                                 count = replace_chars(result, ALLOWED_CHARS_INPUT);
1251                                 if (count > 0)
1252                                         info(udevice->udev, "%i character(s) replaced\n" , count);
1253                         }
1254                         dbg(udevice->udev, "result is '%s'\n", result);
1255                         strlcpy(udevice->program_result, result, sizeof(udevice->program_result));
1256                         dbg(udevice->udev, "PROGRAM returned successful\n");
1257                         if (rule->program.operation == KEY_OP_NOMATCH)
1258                                 goto nomatch;
1259                 }
1260                 dbg(udevice->udev, "PROGRAM key is true\n");
1261         }
1262
1263         /* check for matching result of external program */
1264         if (match_key(udevice->udev, "RESULT", rule, &rule->result, udevice->program_result))
1265                 goto nomatch;
1266
1267         /* import variables returned from program or or file into environment */
1268         if (rule->import.operation != KEY_OP_UNSET) {
1269                 char import[PATH_SIZE];
1270                 int rc = -1;
1271
1272                 strlcpy(import, key_val(rule, &rule->import), sizeof(import));
1273                 udev_rules_apply_format(udevice, import, sizeof(import));
1274                 dbg(udevice->udev, "check for IMPORT import='%s'\n", import);
1275                 if (rule->import_type == IMPORT_PROGRAM) {
1276                         rc = import_program_into_env(udevice, import);
1277                 } else if (rule->import_type == IMPORT_FILE) {
1278                         dbg(udevice->udev, "import file import='%s'\n", import);
1279                         rc = import_file_into_env(udevice, import);
1280                 } else if (rule->import_type == IMPORT_PARENT) {
1281                         dbg(udevice->udev, "import parent import='%s'\n", import);
1282                         rc = import_parent_into_env(udevice, import);
1283                 }
1284                 if (rc != 0) {
1285                         dbg(udevice->udev, "IMPORT failed\n");
1286                         if (rule->import.operation != KEY_OP_NOMATCH)
1287                                 goto nomatch;
1288                 } else
1289                         dbg(udevice->udev, "IMPORT '%s' imported\n", key_val(rule, &rule->import));
1290                 dbg(udevice->udev, "IMPORT key is true\n");
1291         }
1292
1293         /* rule matches, if we have ENV assignments export it */
1294         for (i = 0; i < rule->env.count; i++) {
1295                 struct key_pair *pair = &rule->env.keys[i];
1296
1297                 if (pair->key.operation == KEY_OP_ASSIGN) {
1298                         char temp_value[NAME_SIZE];
1299                         const char *key_name = key_pair_name(rule, pair);
1300                         const char *value = key_val(rule, &pair->key);
1301
1302                         /* make sure we don't write to the same string we possibly read from */
1303                         strlcpy(temp_value, value, sizeof(temp_value));
1304                         udev_rules_apply_format(udevice, temp_value, NAME_SIZE);
1305
1306                         if (temp_value[0] == '\0') {
1307                                 name_list_key_remove(udevice->udev, &udevice->env_list, key_name);
1308                                 unsetenv(key_name);
1309                                 info(udevice->udev, "unset ENV '%s'\n", key_name);
1310                         } else {
1311                                 struct name_entry *entry;
1312
1313                                 entry = name_list_key_add(udevice->udev, &udevice->env_list, key_name, temp_value);
1314                                 if (entry == NULL)
1315                                         break;
1316                                 putenv(entry->name);
1317                                 info(udevice->udev, "set ENV '%s'\n", entry->name);
1318                         }
1319                 }
1320         }
1321
1322         /* if we have ATTR assignments, write value to sysfs file */
1323         for (i = 0; i < rule->attr.count; i++) {
1324                 struct key_pair *pair = &rule->attr.keys[i];
1325
1326                 if (pair->key.operation == KEY_OP_ASSIGN) {
1327                         const char *key_name = key_pair_name(rule, pair);
1328                         char devpath[PATH_SIZE];
1329                         char *attrib;
1330                         char attr[PATH_SIZE] = "";
1331                         char value[NAME_SIZE];
1332                         FILE *f;
1333
1334                         if (attr_get_by_subsys_id(udevice->udev, key_name, devpath, sizeof(devpath), &attrib)) {
1335                                 if (attrib != NULL) {
1336                                         strlcpy(attr, udev_get_sys_path(udevice->udev), sizeof(attr));
1337                                         strlcat(attr, devpath, sizeof(attr));
1338                                         strlcat(attr, "/", sizeof(attr));
1339                                         strlcat(attr, attrib, sizeof(attr));
1340                                 }
1341                         }
1342
1343                         if (attr[0] == '\0') {
1344                                 strlcpy(attr, udev_get_sys_path(udevice->udev), sizeof(attr));
1345                                 strlcat(attr, udevice->dev->devpath, sizeof(attr));
1346                                 strlcat(attr, "/", sizeof(attr));
1347                                 strlcat(attr, key_name, sizeof(attr));
1348                         }
1349
1350                         attr_subst_subdir(attr, sizeof(attr));
1351
1352                         strlcpy(value, key_val(rule, &pair->key), sizeof(value));
1353                         udev_rules_apply_format(udevice, value, sizeof(value));
1354                         info(udevice->udev, "writing '%s' to sysfs file '%s'\n", value, attr);
1355                         f = fopen(attr, "w");
1356                         if (f != NULL) {
1357                                 if (!udevice->test_run)
1358                                         if (fprintf(f, "%s", value) <= 0)
1359                                                 err(udevice->udev, "error writing ATTR{%s}: %s\n", attr, strerror(errno));
1360                                 fclose(f);
1361                         } else
1362                                 err(udevice->udev, "error opening ATTR{%s} for writing: %s\n", attr, strerror(errno));
1363                 }
1364         }
1365         return 0;
1366
1367 nomatch:
1368         return -1;
1369 }
1370
1371 int udev_rules_get_name(struct udev_rules *rules, struct udevice *udevice)
1372 {
1373         struct udev_rule *rule;
1374         int name_set = 0;
1375
1376         dbg(udevice->udev, "udevice->dev->devpath='%s'\n", udevice->dev->devpath);
1377         dbg(udevice->udev, "udevice->dev->kernel='%s'\n", udevice->dev->kernel);
1378
1379         /* look for a matching rule to apply */
1380         udev_rules_iter_init(rules);
1381         while (1) {
1382                 rule = udev_rules_iter_next(rules);
1383                 if (rule == NULL)
1384                         break;
1385
1386                 if (name_set &&
1387                     (rule->name.operation == KEY_OP_ASSIGN ||
1388                      rule->name.operation == KEY_OP_ASSIGN_FINAL ||
1389                      rule->name.operation == KEY_OP_ADD)) {
1390                         dbg(udevice->udev, "node name already set, rule ignored\n");
1391                         continue;
1392                 }
1393
1394                 dbg(udevice->udev, "process rule\n");
1395                 if (match_rule(udevice, rule) == 0) {
1396                         /* apply options */
1397                         if (rule->ignore_device) {
1398                                 info(udevice->udev, "rule applied, '%s' is ignored\n", udevice->dev->kernel);
1399                                 udevice->ignore_device = 1;
1400                                 return 0;
1401                         }
1402                         if (rule->ignore_remove) {
1403                                 udevice->ignore_remove = 1;
1404                                 dbg(udevice->udev, "remove event should be ignored\n");
1405                         }
1406                         if (rule->link_priority != 0) {
1407                                 udevice->link_priority = rule->link_priority;
1408                                 info(udevice->udev, "link_priority=%i\n", udevice->link_priority);
1409                         }
1410                         if (rule->event_timeout >= 0) {
1411                                 udevice->event_timeout = rule->event_timeout;
1412                                 info(udevice->udev, "event_timeout=%i\n", udevice->event_timeout);
1413                         }
1414                         /* apply all_partitions option only at a main block device */
1415                         if (rule->partitions &&
1416                             strcmp(udevice->dev->subsystem, "block") == 0 && udevice->dev->kernel_number[0] == '\0') {
1417                                 udevice->partitions = rule->partitions;
1418                                 dbg(udevice->udev, "creation of partition nodes requested\n");
1419                         }
1420
1421                         /* apply permissions */
1422                         if (!udevice->mode_final && rule->mode.operation != KEY_OP_UNSET) {
1423                                 if (rule->mode.operation == KEY_OP_ASSIGN_FINAL)
1424                                         udevice->mode_final = 1;
1425                                 char buf[20];
1426                                 strlcpy(buf, key_val(rule, &rule->mode), sizeof(buf));
1427                                 udev_rules_apply_format(udevice, buf, sizeof(buf));
1428                                 udevice->mode = strtol(buf, NULL, 8);
1429                                 dbg(udevice->udev, "applied mode=%#o to '%s'\n", udevice->mode, udevice->dev->kernel);
1430                         }
1431                         if (!udevice->owner_final && rule->owner.operation != KEY_OP_UNSET) {
1432                                 if (rule->owner.operation == KEY_OP_ASSIGN_FINAL)
1433                                         udevice->owner_final = 1;
1434                                 strlcpy(udevice->owner, key_val(rule, &rule->owner), sizeof(udevice->owner));
1435                                 udev_rules_apply_format(udevice, udevice->owner, sizeof(udevice->owner));
1436                                 dbg(udevice->udev, "applied owner='%s' to '%s'\n", udevice->owner, udevice->dev->kernel);
1437                         }
1438                         if (!udevice->group_final && rule->group.operation != KEY_OP_UNSET) {
1439                                 if (rule->group.operation == KEY_OP_ASSIGN_FINAL)
1440                                         udevice->group_final = 1;
1441                                 strlcpy(udevice->group, key_val(rule, &rule->group), sizeof(udevice->group));
1442                                 udev_rules_apply_format(udevice, udevice->group, sizeof(udevice->group));
1443                                 dbg(udevice->udev, "applied group='%s' to '%s'\n", udevice->group, udevice->dev->kernel);
1444                         }
1445
1446                         /* collect symlinks */
1447                         if (!udevice->symlink_final &&
1448                             (rule->symlink.operation == KEY_OP_ASSIGN ||
1449                              rule->symlink.operation == KEY_OP_ASSIGN_FINAL ||
1450                              rule->symlink.operation == KEY_OP_ADD)) {
1451                                 char temp[PATH_SIZE];
1452                                 char *pos, *next;
1453                                 int count;
1454
1455                                 if (rule->symlink.operation == KEY_OP_ASSIGN_FINAL)
1456                                         udevice->symlink_final = 1;
1457                                 if (rule->symlink.operation == KEY_OP_ASSIGN ||
1458                                     rule->symlink.operation == KEY_OP_ASSIGN_FINAL) {
1459                                         info(udevice->udev, "reset symlink list\n");
1460                                         name_list_cleanup(udevice->udev, &udevice->symlink_list);
1461                                 }
1462                                 /* allow  multiple symlinks separated by spaces */
1463                                 strlcpy(temp, key_val(rule, &rule->symlink), sizeof(temp));
1464                                 udev_rules_apply_format(udevice, temp, sizeof(temp));
1465                                 if (rule->string_escape == ESCAPE_UNSET ||
1466                                     rule->string_escape == ESCAPE_REPLACE) {
1467                                         count = replace_chars(temp, ALLOWED_CHARS_FILE " ");
1468                                         if (count > 0)
1469                                                 info(udevice->udev, "%i character(s) replaced\n" , count);
1470                                 }
1471                                 dbg(udevice->udev, "rule applied, added symlink(s) '%s'\n", temp);
1472                                 pos = temp;
1473                                 while (isspace(pos[0]))
1474                                         pos++;
1475                                 next = strchr(pos, ' ');
1476                                 while (next) {
1477                                         next[0] = '\0';
1478                                         info(udevice->udev, "add symlink '%s'\n", pos);
1479                                         name_list_add(udevice->udev, &udevice->symlink_list, pos, 0);
1480                                         while (isspace(next[1]))
1481                                                 next++;
1482                                         pos = &next[1];
1483                                         next = strchr(pos, ' ');
1484                                 }
1485                                 if (pos[0] != '\0') {
1486                                         info(udevice->udev, "add symlink '%s'\n", pos);
1487                                         name_list_add(udevice->udev, &udevice->symlink_list, pos, 0);
1488                                 }
1489                         }
1490
1491                         /* set name, later rules with name set will be ignored */
1492                         if (rule->name.operation == KEY_OP_ASSIGN ||
1493                             rule->name.operation == KEY_OP_ASSIGN_FINAL ||
1494                             rule->name.operation == KEY_OP_ADD) {
1495                                 int count;
1496
1497                                 name_set = 1;
1498                                 strlcpy(udevice->name, key_val(rule, &rule->name), sizeof(udevice->name));
1499                                 udev_rules_apply_format(udevice, udevice->name, sizeof(udevice->name));
1500                                 if (rule->string_escape == ESCAPE_UNSET ||
1501                                     rule->string_escape == ESCAPE_REPLACE) {
1502                                         count = replace_chars(udevice->name, ALLOWED_CHARS_FILE);
1503                                         if (count > 0)
1504                                                 info(udevice->udev, "%i character(s) replaced\n", count);
1505                                 }
1506
1507                                 info(udevice->udev, "rule applied, '%s' becomes '%s'\n", udevice->dev->kernel, udevice->name);
1508                                 if (strcmp(udevice->dev->subsystem, "net") != 0)
1509                                         dbg(udevice->udev, "name, '%s' is going to have owner='%s', group='%s', mode=%#o partitions=%i\n",
1510                                             udevice->name, udevice->owner, udevice->group, udevice->mode, udevice->partitions);
1511                         }
1512
1513                         if (!udevice->run_final && rule->run.operation != KEY_OP_UNSET) {
1514                                 struct name_entry *entry;
1515
1516                                 if (rule->run.operation == KEY_OP_ASSIGN_FINAL)
1517                                         udevice->run_final = 1;
1518                                 if (rule->run.operation == KEY_OP_ASSIGN || rule->run.operation == KEY_OP_ASSIGN_FINAL) {
1519                                         info(udevice->udev, "reset run list\n");
1520                                         name_list_cleanup(udevice->udev, &udevice->run_list);
1521                                 }
1522                                 dbg(udevice->udev, "add run '%s'\n", key_val(rule, &rule->run));
1523                                 entry = name_list_add(udevice->udev, &udevice->run_list, key_val(rule, &rule->run), 0);
1524                                 if (rule->run_ignore_error)
1525                                         entry->ignore_error = 1;
1526                         }
1527
1528                         if (rule->last_rule) {
1529                                 dbg(udevice->udev, "last rule to be applied\n");
1530                                 break;
1531                         }
1532
1533                         if (rule->goto_label.operation != KEY_OP_UNSET) {
1534                                 dbg(udevice->udev, "moving forward to label '%s'\n", key_val(rule, &rule->goto_label));
1535                                 udev_rules_iter_label(rules, key_val(rule, &rule->goto_label));
1536                         }
1537                 }
1538         }
1539
1540         if (!name_set) {
1541                 info(udevice->udev, "no node name set, will use kernel name '%s'\n", udevice->dev->kernel);
1542                 strlcpy(udevice->name, udevice->dev->kernel, sizeof(udevice->name));
1543         }
1544
1545         if (udevice->tmp_node[0] != '\0') {
1546                 dbg(udevice->udev, "removing temporary device node\n");
1547                 unlink_secure(udevice->udev, udevice->tmp_node);
1548                 udevice->tmp_node[0] = '\0';
1549         }
1550
1551         return 0;
1552 }
1553
1554 int udev_rules_get_run(struct udev_rules *rules, struct udevice *udevice)
1555 {
1556         struct udev_rule *rule;
1557
1558         dbg(udevice->udev, "udevice->kernel='%s'\n", udevice->dev->kernel);
1559
1560         /* look for a matching rule to apply */
1561         udev_rules_iter_init(rules);
1562         while (1) {
1563                 rule = udev_rules_iter_next(rules);
1564                 if (rule == NULL)
1565                         break;
1566
1567                 dbg(udevice->udev, "process rule\n");
1568                 if (rule->name.operation == KEY_OP_ASSIGN ||
1569                     rule->name.operation == KEY_OP_ASSIGN_FINAL ||
1570                     rule->name.operation == KEY_OP_ADD ||
1571                     rule->symlink.operation == KEY_OP_ASSIGN ||
1572                     rule->symlink.operation == KEY_OP_ASSIGN_FINAL ||
1573                     rule->symlink.operation == KEY_OP_ADD ||
1574                     rule->mode.operation != KEY_OP_UNSET ||
1575                     rule->owner.operation != KEY_OP_UNSET || rule->group.operation != KEY_OP_UNSET) {
1576                         dbg(udevice->udev, "skip rule that names a device\n");
1577                         continue;
1578                 }
1579
1580                 if (match_rule(udevice, rule) == 0) {
1581                         if (rule->ignore_device) {
1582                                 info(udevice->udev, "rule applied, '%s' is ignored\n", udevice->dev->kernel);
1583                                 udevice->ignore_device = 1;
1584                                 return 0;
1585                         }
1586                         if (rule->ignore_remove) {
1587                                 udevice->ignore_remove = 1;
1588                                 dbg(udevice->udev, "remove event should be ignored\n");
1589                         }
1590
1591                         if (!udevice->run_final && rule->run.operation != KEY_OP_UNSET) {
1592                                 struct name_entry *entry;
1593
1594                                 if (rule->run.operation == KEY_OP_ASSIGN ||
1595                                     rule->run.operation == KEY_OP_ASSIGN_FINAL) {
1596                                         info(udevice->udev, "reset run list\n");
1597                                         name_list_cleanup(udevice->udev, &udevice->run_list);
1598                                 }
1599                                 dbg(udevice->udev, "add run '%s'\n", key_val(rule, &rule->run));
1600                                 entry = name_list_add(udevice->udev, &udevice->run_list, key_val(rule, &rule->run), 0);
1601                                 if (rule->run_ignore_error)
1602                                         entry->ignore_error = 1;
1603                                 if (rule->run.operation == KEY_OP_ASSIGN_FINAL)
1604                                         break;
1605                         }
1606
1607                         if (rule->last_rule) {
1608                                 dbg(udevice->udev, "last rule to be applied\n");
1609                                 break;
1610                         }
1611
1612                         if (rule->goto_label.operation != KEY_OP_UNSET) {
1613                                 dbg(udevice->udev, "moving forward to label '%s'\n", key_val(rule, &rule->goto_label));
1614                                 udev_rules_iter_label(rules, key_val(rule, &rule->goto_label));
1615                         }
1616                 }
1617         }
1618
1619         return 0;
1620 }