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