support/nfs/conffile.c

   1 /*      $OpenBSD: conf.c,v 1.55 2003/06/03 14:28:16 ho Exp $    */
   2 /*      $EOM: conf.c,v 1.48 2000/12/04 02:04:29 angelos Exp $   */
   3
   4 /*
   5  * Copyright (c) 1998, 1999, 2000, 2001 Niklas Hallqvist.  All rights reserved.
   6  * Copyright (c) 2000, 2001, 2002 Håkan Olsson.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 /*
  30  * This code was written under funding by Ericsson Radio Systems.
  31  */
  32
  33 #include <sys/param.h>
  34 #include <sys/mman.h>
  35 #include <sys/socket.h>
  36 #include <sys/stat.h>
  37 #include <netinet/in.h>
  38 #include <arpa/inet.h>
  39 #include <ctype.h>
  40 #include <fcntl.h>
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 #include <unistd.h>
  45 #include <errno.h>
  46 #include <err.h>
  47 #include <syslog.h>
  48
  49 #include "conffile.h"
  50 #include "xlog.h"
  51
  52 static void conf_load_defaults(void);
  53 static int conf_set(int , char *, char *, char *,
  54         char *, int , int );
  55
  56 struct conf_trans {
  57         TAILQ_ENTRY (conf_trans) link;
  58         int trans;
  59         enum conf_op { CONF_SET, CONF_REMOVE, CONF_REMOVE_SECTION } op;
  60         char *section;
  61         char *arg;
  62         char *tag;
  63         char *value;
  64         int override;
  65         int is_default;
  66 };
  67
  68 TAILQ_HEAD (conf_trans_head, conf_trans) conf_trans_queue;
  69
  70 /*
  71  * Radix-64 Encoding.
  72  */
  73 static const u_int8_t bin2asc[]
  74   = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  75
  76 static const u_int8_t asc2bin[] =
  77 {
  78   255, 255, 255, 255, 255, 255, 255, 255,
  79   255, 255, 255, 255, 255, 255, 255, 255,
  80   255, 255, 255, 255, 255, 255, 255, 255,
  81   255, 255, 255, 255, 255, 255, 255, 255,
  82   255, 255, 255, 255, 255, 255, 255, 255,
  83   255, 255, 255,  62, 255, 255, 255,  63,
  84    52,  53,  54,  55,  56,  57,  58,  59,
  85    60,  61, 255, 255, 255, 255, 255, 255,
  86   255,   0,   1,   2,   3,   4,   5,   6,
  87     7,   8,   9,  10,  11,  12,  13,  14,
  88    15,  16,  17,  18,  19,  20,  21,  22,
  89    23,  24,  25, 255, 255, 255, 255, 255,
  90   255,  26,  27,  28,  29,  30,  31,  32,
  91    33,  34,  35,  36,  37,  38,  39,  40,
  92    41,  42,  43,  44,  45,  46,  47,  48,
  93    49,  50,  51, 255, 255, 255, 255, 255
  94 };
  95
  96 struct conf_binding {
  97   LIST_ENTRY (conf_binding) link;
  98   char *section;
  99   char *arg;
 100   char *tag;
 101   char *value;
 102   int is_default;
 103 };
 104
 105 char *conf_path;
 106 LIST_HEAD (conf_bindings, conf_binding) conf_bindings[256];
 107
 108 static char *conf_addr;
 109
 110 static __inline__ u_int8_t
 111 conf_hash(char *s)
 112 {
 113         u_int8_t hash = 0;
 114
 115         while (*s) {
 116                 hash = ((hash << 1) | (hash >> 7)) ^ tolower (*s);
 117                 s++;
 118         }
 119         return hash;
 120 }
 121
 122 /*
 123  * Insert a tag-value combination from LINE (the equal sign is at POS)
 124  */
 125 static int
 126 conf_remove_now(char *section, char *tag)
 127 {
 128         struct conf_binding *cb, *next;
 129
 130         cb = LIST_FIRST(&conf_bindings[conf_hash (section)]);
 131         for (; cb; cb = next) {
 132                 next = LIST_NEXT(cb, link);
 133                 if (strcasecmp(cb->section, section) == 0
 134                                 && strcasecmp(cb->tag, tag) == 0) {
 135                         LIST_REMOVE(cb, link);
 136                         xlog(LOG_INFO,"[%s]:%s->%s removed", section, tag, cb->value);
 137                         free(cb->section);
 138                         free(cb->arg);
 139                         free(cb->tag);
 140                         free(cb->value);
 141                         free(cb);
 142                         return 0;
 143                 }
 144         }
 145         return 1;
 146 }
 147
 148 static int
 149 conf_remove_section_now(char *section)
 150 {
 151   struct conf_binding *cb, *next;
 152   int unseen = 1;
 153
 154         cb = LIST_FIRST(&conf_bindings[conf_hash (section)]);
 155         for (; cb; cb = next) {
 156                 next = LIST_NEXT(cb, link);
 157                 if (strcasecmp(cb->section, section) == 0) {
 158                         unseen = 0;
 159                         LIST_REMOVE(cb, link);
 160                         xlog(LOG_INFO, "[%s]:%s->%s removed", section, cb->tag, cb->value);
 161                         free(cb->section);
 162                         free(cb->arg);
 163                         free(cb->tag);
 164                         free(cb->value);
 165                         free(cb);
 166                         }
 167                 }
 168         return unseen;
 169 }
 170
 171 /*
 172  * Insert a tag-value combination from LINE (the equal sign is at POS)
 173  * into SECTION of our configuration database.
 174  */
 175 static int
 176 conf_set_now(char *section, char *arg, char *tag,
 177         char *value, int override, int is_default)
 178 {
 179         struct conf_binding *node = 0;
 180
 181         if (override)
 182                 conf_remove_now(section, tag);
 183         else if (conf_get_section(section, arg, tag)) {
 184                 if (!is_default) {
 185                         xlog(LOG_INFO, "conf_set: duplicate tag [%s]:%s, ignoring...\n",
 186                                 section, tag);
 187                 }
 188                 return 1;
 189         }
 190         node = calloc(1, sizeof *node);
 191         if (!node) {
 192                 xlog_warn("conf_set: calloc (1, %lu) failed", (unsigned long)sizeof *node);
 193                 return 1;
 194         }
 195         node->section = strdup(section);
 196         if (arg)
 197                 node->arg = strdup(arg);
 198         node->tag = strdup(tag);
 199         node->value = strdup(value);
 200         node->is_default = is_default;
 201
 202         LIST_INSERT_HEAD(&conf_bindings[conf_hash (section)], node, link);
 203         return 0;
 204 }
 205
 206 /*
 207  * Parse the line LINE of SZ bytes.  Skip Comments, recognize section
 208  * headers and feed tag-value pairs into our configuration database.
 209  */
 210 static void
 211 conf_parse_line(int trans, char *line, size_t sz)
 212 {
 213         char *val, *ptr;
 214         size_t i;
 215         size_t j;
 216         static char *section = 0;
 217         static char *arg = 0;
 218         static int ln = 0;
 219
 220         /* Lines starting with '#' or ';' are comments.  */
 221         ln++;
 222         /* Ignore blank lines */
 223         if (*line == '\0')
 224                 return;
 225
 226         /* Strip off any leading blanks */
 227         while (isblank(*line))
 228                 line++;
 229
 230         if (*line == '#' || *line == ';')
 231                 return;
 232
 233         /* '[section]' parsing...  */
 234         if (*line == '[') {
 235                 line++;
 236                 /* Strip off any blanks after '[' */
 237                 while (isblank(*line))
 238                         line++;
 239                 for (i = 0; i < sz; i++) {
 240                         if (line[i] == ']') {
 241                                 break;
 242                         }
 243                 }
 244                 if (section)
 245                         free(section);
 246                 if (i == sz) {
 247                         xlog_warn("config file error: line %d: "
 248                                 "non-matched ']', ignoring until next section", ln);
 249                         section = 0;
 250                         return;
 251                 }
 252                 /* Strip off any blanks before ']' */
 253                 val = line;
 254                 while (*val && !isblank(*val))
 255                         val++, j++;
 256                 if (*val)
 257                         i = j;
 258                 section = malloc(i);
 259                 if (!section) {
 260                         xlog_warn("conf_parse_line: %d: malloc (%lu) failed", ln,
 261                                                 (unsigned long)i);
 262                         return;
 263                 }
 264                 strncpy(section, line, i);
 265
 266                 if (arg)
 267                         free(arg);
 268                 arg = 0;
 269
 270                 ptr = strchr(val, '"');
 271                 if (ptr == NULL)
 272                         return;
 273                 line = ++ptr;
 274                 while (*ptr && *ptr != '"')
 275                         ptr++;
 276                 if (*ptr == '\0') {
 277                         xlog_warn("config file error: line %d: "
 278                                 "non-matched '\"', ignoring until next section", ln);
 279                 }  else {
 280                         *ptr = '\0';
 281                         arg = strdup(line);
 282                         if (!arg)
 283                                 xlog_warn("conf_parse_line: %d: malloc arg failed", ln);
 284                 }
 285                 return;
 286         }
 287
 288         /* Deal with assignments.  */
 289         for (i = 0; i < sz; i++) {
 290                 if (line[i] == '=') {
 291                         /* If no section, we are ignoring the lines.  */
 292                         if (!section) {
 293                         xlog_warn("config file error: line %d: "
 294                                 "ignoring line due to no section", ln);
 295                                 return;
 296                         }
 297                         line[strcspn (line, " \t=")] = '\0';
 298                         val = line + i + 1 + strspn (line + i + 1, " \t");
 299
 300                         /* Skip trailing comments, if any */
 301                         for (j = 0; j < sz - (val - line); j++) {
 302                                 if (val[j] == '#' || val[j] == ';') {
 303                                         val[j] = '\0';
 304                                         break;
 305                                 }
 306                         }
 307
 308                         /* Skip trailing whitespace, if any */
 309                         for (j--; j > 0; j--) {
 310                                 if (isspace(val[j]))
 311                                         val[j] = '\0';
 312                                 else
 313                                         break;
 314                         }
 315
 316                         /* XXX Perhaps should we not ignore errors?  */
 317                         conf_set(trans, section, arg, line, val, 0, 0);
 318                         return;
 319                 }
 320         }
 321         /* Other non-empty lines are weird.  */
 322         i = strspn(line, " \t");
 323         if (line[i])
 324                 xlog_warn("config file error: line %d:", ln);
 325
 326         return;
 327 }
 328
 329 /* Parse the mapped configuration file.  */
 330 static void
 331 conf_parse(int trans, char *buf, size_t sz)
 332 {
 333         char *cp = buf;
 334         char *bufend = buf + sz;
 335         char *line;
 336
 337         line = cp;
 338         while (cp < bufend) {
 339                 if (*cp == '\n') {
 340                         /* Check for escaped newlines.  */
 341                         if (cp > buf && *(cp - 1) == '\\')
 342                                 *(cp - 1) = *cp = ' ';
 343                         else {
 344                                 *cp = '\0';
 345                                 conf_parse_line(trans, line, cp - line);
 346                                 line = cp + 1;
 347                         }
 348                 }
 349                 cp++;
 350         }
 351         if (cp != line)
 352                 xlog_warn("conf_parse: last line non-terminated, ignored.");
 353 }
 354
 355 static void
 356 conf_load_defaults(void)
 357 {
 358         /* No defaults */
 359         return;
 360 }
 361
 362 void
 363 conf_init (void)
 364 {
 365         unsigned int i;
 366
 367         for (i = 0; i < sizeof conf_bindings / sizeof conf_bindings[0]; i++)
 368                 LIST_INIT (&conf_bindings[i]);
 369
 370         TAILQ_INIT (&conf_trans_queue);
 371         conf_reinit();
 372 }
 373
 374 /* Open the config file and map it into our address space, then parse it.  */
 375 void
 376 conf_reinit(void)
 377 {
 378         struct conf_binding *cb = 0;
 379         int fd, trans;
 380         unsigned int i;
 381         size_t sz;
 382         char *new_conf_addr = 0;
 383         struct stat sb;
 384
 385         if ((stat (conf_path, &sb) == 0) || (errno != ENOENT)) {
 386                 sz = sb.st_size;
 387                 fd = open (conf_path, O_RDONLY, 0);
 388                 if (fd == -1) {
 389                         xlog_warn("conf_reinit: open (\"%s\", O_RDONLY) failed", conf_path);
 390                         return;
 391                 }
 392
 393                 new_conf_addr = malloc(sz);
 394                 if (!new_conf_addr) {
 395                         xlog_warn("conf_reinit: malloc (%lu) failed", (unsigned long)sz);
 396                         goto fail;
 397                 }
 398
 399                 /* XXX I assume short reads won't happen here.  */
 400                 if (read (fd, new_conf_addr, sz) != (int)sz) {
 401                         xlog_warn("conf_reinit: read (%d, %p, %lu) failed",
 402                                 fd, new_conf_addr, (unsigned long)sz);
 403                         goto fail;
 404                 }
 405                 close(fd);
 406
 407                 trans = conf_begin();
 408                 /* XXX Should we not care about errors and rollback?  */
 409                 conf_parse(trans, new_conf_addr, sz);
 410         }
 411         else
 412                 trans = conf_begin();
 413
 414         /* Load default configuration values.  */
 415         conf_load_defaults();
 416
 417         /* Free potential existing configuration.  */
 418         if (conf_addr) {
 419                 for (i = 0; i < sizeof conf_bindings / sizeof conf_bindings[0]; i++) {
 420                         cb = LIST_FIRST (&conf_bindings[i]);
 421                         for (; cb; cb = LIST_FIRST (&conf_bindings[i]))
 422                                 conf_remove_now(cb->section, cb->tag);
 423                 }
 424                 free (conf_addr);
 425         }
 426
 427         conf_end(trans, 1);
 428         conf_addr = new_conf_addr;
 429         return;
 430
 431 fail:
 432         if (new_conf_addr)
 433                 free(new_conf_addr);
 434         close (fd);
 435 }
 436
 437 /*
 438  * Return the numeric value denoted by TAG in section SECTION or DEF
 439  * if that tag does not exist.
 440  */
 441 int
 442 conf_get_num(char *section, char *tag, int def)
 443 {
 444         char *value = conf_get_str(section, tag);
 445
 446         if (value)
 447                 return atoi(value);
 448
 449         return def;
 450 }
 451
 452 /* Validate X according to the range denoted by TAG in section SECTION.  */
 453 int
 454 conf_match_num(char *section, char *tag, int x)
 455 {
 456         char *value = conf_get_str (section, tag);
 457         int val, min, max, n;
 458
 459         if (!value)
 460                 return 0;
 461         n = sscanf (value, "%d,%d:%d", &val, &min, &max);
 462         switch (n) {
 463         case 1:
 464                 xlog(LOG_INFO, "conf_match_num: %s:%s %d==%d?", section, tag, val, x);
 465                 return x == val;
 466         case 3:
 467                 xlog(LOG_INFO, "conf_match_num: %s:%s %d<=%d<=%d?", section,
 468                         tag, min, x, max);
 469                 return min <= x && max >= x;
 470         default:
 471                 xlog(LOG_INFO, "conf_match_num: section %s tag %s: invalid number spec %s",
 472                         section, tag, value);
 473         }
 474         return 0;
 475 }
 476
 477 /* Return the string value denoted by TAG in section SECTION.  */
 478 char *
 479 conf_get_str(char *section, char *tag)
 480 {
 481         struct conf_binding *cb;
 482
 483         cb = LIST_FIRST (&conf_bindings[conf_hash (section)]);
 484         for (; cb; cb = LIST_NEXT (cb, link)) {
 485                 if (strcasecmp (section, cb->section) == 0
 486                                 && strcasecmp (tag, cb->tag) == 0)
 487                         return cb->value;
 488         }
 489         return 0;
 490 }
 491 /*
 492  * Find a section that may or may not have an argument
 493  */
 494 char *
 495 conf_get_section(char *section, char *arg, char *tag)
 496 {
 497         struct conf_binding *cb;
 498
 499         cb = LIST_FIRST (&conf_bindings[conf_hash (section)]);
 500         for (; cb; cb = LIST_NEXT (cb, link)) {
 501                 if (strcasecmp(section, cb->section) != 0)
 502                         continue;
 503                 if (arg && strcasecmp(arg, cb->arg) != 0)
 504                         continue;
 505                 if (strcasecmp(tag, cb->tag) != 0)
 506                         continue;
 507                 return cb->value;
 508         }
 509         return 0;
 510 }
 511
 512 /*
 513  * Build a list of string values out of the comma separated value denoted by
 514  * TAG in SECTION.
 515  */
 516 struct conf_list *
 517 conf_get_list(char *section, char *tag)
 518 {
 519         char *liststr = 0, *p, *field, *t;
 520         struct conf_list *list = 0;
 521         struct conf_list_node *node;
 522
 523         list = malloc (sizeof *list);
 524         if (!list)
 525                 goto cleanup;
 526         TAILQ_INIT (&list->fields);
 527         list->cnt = 0;
 528         liststr = conf_get_str(section, tag);
 529         if (!liststr)
 530                 goto cleanup;
 531         liststr = strdup (liststr);
 532         if (!liststr)
 533                 goto cleanup;
 534         p = liststr;
 535         while ((field = strsep (&p, ",")) != NULL) {
 536                 /* Skip leading whitespace */
 537                 while (isspace (*field))
 538                         field++;
 539                 /* Skip trailing whitespace */
 540                 if (p) {
 541                         for (t = p - 1; t > field && isspace (*t); t--)
 542                                 *t = '\0';
 543                 }
 544                 if (*field == '\0') {
 545                         xlog(LOG_INFO, "conf_get_list: empty field, ignoring...");
 546                         continue;
 547                 }
 548                 list->cnt++;
 549                 node = calloc (1, sizeof *node);
 550                 if (!node)
 551                         goto cleanup;
 552                 node->field = strdup (field);
 553                 if (!node->field) {
 554                         free(node);
 555                         goto cleanup;
 556                 }
 557                 TAILQ_INSERT_TAIL (&list->fields, node, link);
 558         }
 559         free (liststr);
 560         return list;
 561
 562 cleanup:
 563         if (list)
 564                 conf_free_list(list);
 565         if (liststr)
 566                 free(liststr);
 567         return 0;
 568 }
 569
 570 struct conf_list *
 571 conf_get_tag_list(char *section)
 572 {
 573         struct conf_list *list = 0;
 574         struct conf_list_node *node;
 575         struct conf_binding *cb;
 576
 577         list = malloc(sizeof *list);
 578         if (!list)
 579                 goto cleanup;
 580         TAILQ_INIT(&list->fields);
 581         list->cnt = 0;
 582         cb = LIST_FIRST(&conf_bindings[conf_hash (section)]);
 583         for (; cb; cb = LIST_NEXT(cb, link)) {
 584                 if (strcasecmp (section, cb->section) == 0) {
 585                         list->cnt++;
 586                         node = calloc(1, sizeof *node);
 587                         if (!node)
 588                                 goto cleanup;
 589                         node->field = strdup(cb->tag);
 590                         if (!node->field) {
 591                                 free(node);
 592                                 goto cleanup;
 593                         }
 594                         TAILQ_INSERT_TAIL(&list->fields, node, link);
 595                 }
 596         }
 597         return list;
 598
 599 cleanup:
 600         if (list)
 601                 conf_free_list(list);
 602         return 0;
 603 }
 604
 605 /* Decode a PEM encoded buffer.  */
 606 int
 607 conf_decode_base64 (u_int8_t *out, u_int32_t *len, u_char *buf)
 608 {
 609         u_int32_t c = 0;
 610         u_int8_t c1, c2, c3, c4;
 611
 612         while (*buf) {
 613                 if (*buf > 127 || (c1 = asc2bin[*buf]) == 255)
 614                         return 0;
 615
 616                 buf++;
 617                 if (*buf > 127 || (c2 = asc2bin[*buf]) == 255)
 618                         return 0;
 619
 620                 buf++;
 621                 if (*buf == '=') {
 622                         c3 = c4 = 0;
 623                         c++;
 624
 625                         /* Check last four bit */
 626                         if (c2 & 0xF)
 627                                 return 0;
 628
 629                         if (strcmp((char *)buf, "==") == 0)
 630                                 buf++;
 631                         else
 632                                 return 0;
 633                 } else if (*buf > 127 || (c3 = asc2bin[*buf]) == 255)
 634                         return 0;
 635                 else {
 636                         if (*++buf == '=') {
 637                                 c4 = 0;
 638                                 c += 2;
 639
 640                                 /* Check last two bit */
 641                                 if (c3 & 3)
 642                                         return 0;
 643
 644                         if (strcmp((char *)buf, "="))
 645                                 return 0;
 646                         } else if (*buf > 127 || (c4 = asc2bin[*buf]) == 255)
 647                                 return 0;
 648                         else
 649                                 c += 3;
 650                 }
 651
 652                 buf++;
 653                 *out++ = (c1 << 2) | (c2 >> 4);
 654                 *out++ = (c2 << 4) | (c3 >> 2);
 655                 *out++ = (c3 << 6) | c4;
 656         }
 657
 658         *len = c;
 659         return 1;
 660 }
 661
 662 void
 663 conf_free_list(struct conf_list *list)
 664 {
 665         struct conf_list_node *node = TAILQ_FIRST(&list->fields);
 666
 667         while (node) {
 668                 TAILQ_REMOVE(&list->fields, node, link);
 669                 if (node->field)
 670                         free(node->field);
 671                 free (node);
 672                 node = TAILQ_FIRST(&list->fields);
 673         }
 674         free (list);
 675 }
 676
 677 int
 678 conf_begin(void)
 679 {
 680   static int seq = 0;
 681
 682   return ++seq;
 683 }
 684
 685 static struct conf_trans *
 686 conf_trans_node(int transaction, enum conf_op op)
 687 {
 688         struct conf_trans *node;
 689
 690         node = calloc (1, sizeof *node);
 691         if (!node) {
 692                 xlog_warn("conf_trans_node: calloc (1, %lu) failed",
 693                 (unsigned long)sizeof *node);
 694                 return 0;
 695         }
 696         node->trans = transaction;
 697         node->op = op;
 698         TAILQ_INSERT_TAIL (&conf_trans_queue, node, link);
 699         return node;
 700 }
 701
 702 /* Queue a set operation.  */
 703 static int
 704 conf_set(int transaction, char *section, char *arg,
 705         char *tag, char *value, int override, int is_default)
 706 {
 707         struct conf_trans *node;
 708
 709         node = conf_trans_node(transaction, CONF_SET);
 710         if (!node)
 711                 return 1;
 712         node->section = strdup(section);
 713         if (!node->section) {
 714                 xlog_warn("conf_set: strdup(\"%s\") failed", section);
 715                 goto fail;
 716         }
 717         /* Make Section names case-insensitive */
 718         upper2lower(node->section);
 719
 720         if (arg) {
 721                 node->arg = strdup(arg);
 722                 if (!node->arg) {
 723                         xlog_warn("conf_set: strdup(\"%s\") failed", arg);
 724                         goto fail;
 725                 }
 726         } else
 727                 node->arg = NULL;
 728
 729         node->tag = strdup(tag);
 730         if (!node->tag) {
 731                 xlog_warn("conf_set: strdup(\"%s\") failed", tag);
 732                 goto fail;
 733         }
 734         node->value = strdup(value);
 735         if (!node->value) {
 736                 xlog_warn("conf_set: strdup(\"%s\") failed", value);
 737                 goto fail;
 738         }
 739         node->override = override;
 740         node->is_default = is_default;
 741         return 0;
 742
 743 fail:
 744         if (node->tag)
 745                 free(node->tag);
 746         if (node->section)
 747                 free(node->section);
 748         if (node)
 749                 free(node);
 750         return 1;
 751 }
 752
 753 /* Queue a remove operation.  */
 754 int
 755 conf_remove(int transaction, char *section, char *tag)
 756 {
 757         struct conf_trans *node;
 758
 759         node = conf_trans_node(transaction, CONF_REMOVE);
 760         if (!node)
 761                 goto fail;
 762         node->section = strdup(section);
 763         if (!node->section) {
 764                 xlog_warn("conf_remove: strdup(\"%s\") failed", section);
 765                 goto fail;
 766         }
 767         node->tag = strdup(tag);
 768         if (!node->tag) {
 769                 xlog_warn("conf_remove: strdup(\"%s\") failed", tag);
 770                 goto fail;
 771         }
 772         return 0;
 773
 774 fail:
 775         if (node && node->section)
 776                 free (node->section);
 777         if (node)
 778                 free (node);
 779         return 1;
 780 }
 781
 782 /* Queue a remove section operation.  */
 783 int
 784 conf_remove_section(int transaction, char *section)
 785 {
 786         struct conf_trans *node;
 787
 788         node = conf_trans_node(transaction, CONF_REMOVE_SECTION);
 789         if (!node)
 790                 goto fail;
 791         node->section = strdup(section);
 792         if (!node->section) {
 793                 xlog_warn("conf_remove_section: strdup(\"%s\") failed", section);
 794                 goto fail;
 795         }
 796         return 0;
 797
 798 fail:
 799         if (node)
 800                 free(node);
 801         return 1;
 802 }
 803
 804 /* Execute all queued operations for this transaction.  Cleanup.  */
 805 int
 806 conf_end(int transaction, int commit)
 807 {
 808         struct conf_trans *node, *next;
 809
 810         for (node = TAILQ_FIRST(&conf_trans_queue); node; node = next) {
 811                 next = TAILQ_NEXT(node, link);
 812                 if (node->trans == transaction) {
 813                         if (commit) {
 814                                 switch (node->op) {
 815                                 case CONF_SET:
 816                                         conf_set_now(node->section, node->arg,
 817                                                 node->tag, node->value, node->override,
 818                                                 node->is_default);
 819                                         break;
 820                                 case CONF_REMOVE:
 821                                         conf_remove_now(node->section, node->tag);
 822                                         break;
 823                                 case CONF_REMOVE_SECTION:
 824                                         conf_remove_section_now(node->section);
 825                                         break;
 826                                 default:
 827                                         xlog(LOG_INFO, "conf_end: unknown operation: %d", node->op);
 828                                 }
 829                         }
 830                         TAILQ_REMOVE (&conf_trans_queue, node, link);
 831                         if (node->section)
 832                                 free(node->section);
 833                         if (node->tag)
 834                                 free(node->tag);
 835                         if (node->value)
 836                                 free(node->value);
 837                         free (node);
 838                 }
 839         }
 840         return 0;
 841 }
 842
 843 /*
 844  * Dump running configuration upon SIGUSR1.
 845  * Configuration is "stored in reverse order", so reverse it again.
 846  */
 847 struct dumper {
 848         char *s, *v;
 849         struct dumper *next;
 850 };
 851
 852 static void
 853 conf_report_dump(struct dumper *node)
 854 {
 855         /* Recursive, cleanup when we're done.  */
 856         if (node->next)
 857                 conf_report_dump(node->next);
 858
 859         if (node->v)
 860                 xlog(LOG_INFO, "%s=\t%s", node->s, node->v);
 861         else if (node->s) {
 862                 xlog(LOG_INFO, "%s", node->s);
 863                 if (strlen(node->s) > 0)
 864                         free(node->s);
 865         }
 866
 867         free (node);
 868 }
 869
 870 void
 871 conf_report (void)
 872 {
 873         struct conf_binding *cb, *last = 0;
 874         unsigned int i, len, diff_arg = 0;
 875         char *current_section = (char *)0;
 876         char *current_arg = (char *)0;
 877         struct dumper *dumper, *dnode;
 878
 879         dumper = dnode = (struct dumper *)calloc(1, sizeof *dumper);
 880         if (!dumper)
 881                 goto mem_fail;
 882
 883         xlog(LOG_INFO, "conf_report: dumping running configuration");
 884
 885         for (i = 0; i < sizeof conf_bindings / sizeof conf_bindings[0]; i++)
 886                 for (cb = LIST_FIRST(&conf_bindings[i]); cb; cb = LIST_NEXT(cb, link)) {
 887                         if (!cb->is_default) {
 888                                 /* Make sure the Section arugment is the same */
 889                                 if (current_arg && current_section && cb->arg) {
 890                                         if (strcmp(cb->section, current_section) == 0 &&
 891                                                 strcmp(cb->arg, current_arg) != 0)
 892                                         diff_arg = 1;
 893                                 }
 894                                 /* Dump this entry.  */
 895                                 if (!current_section || strcmp(cb->section, current_section)
 896                                                         || diff_arg) {
 897                                         if (current_section || diff_arg) {
 898                                                 len = strlen (current_section) + 3;
 899                                                 if (current_arg)
 900                                                         len += strlen(current_arg) + 3;
 901                                                 dnode->s = malloc(len);
 902                                                 if (!dnode->s)
 903                                                         goto mem_fail;
 904
 905                                                 if (current_arg)
 906                                                         snprintf(dnode->s, len, "[%s \"%s\"]",
 907                                                                 current_section, current_arg);
 908                                                 else
 909                                                         snprintf(dnode->s, len, "[%s]", current_section);
 910
 911                                                 dnode->next =
 912                                                         (struct dumper *)calloc(1, sizeof (struct dumper));
 913                                                 dnode = dnode->next;
 914                                                 if (!dnode)
 915                                                         goto mem_fail;
 916
 917                                                 dnode->s = "";
 918                                                 dnode->next =
 919                                                         (struct dumper *)calloc(1, sizeof (struct dumper));
 920                                                 dnode = dnode->next;
 921                                                 if (!dnode)
 922                                                 goto mem_fail;
 923                                         }
 924                                         current_section = cb->section;
 925                                         current_arg = cb->arg;
 926                                         diff_arg = 0;
 927                                 }
 928                                 dnode->s = cb->tag;
 929                                 dnode->v = cb->value;
 930                                 dnode->next = (struct dumper *)calloc (1, sizeof (struct dumper));
 931                                 dnode = dnode->next;
 932                                 if (!dnode)
 933                                         goto mem_fail;
 934                                 last = cb;
 935                 }
 936         }
 937
 938         if (last) {
 939                 len = strlen(last->section) + 3;
 940                 if (last->arg)
 941                         len += strlen(last->arg) + 3;
 942                 dnode->s = malloc(len);
 943                 if (!dnode->s)
 944                         goto mem_fail;
 945                 if (last->arg)
 946                         snprintf(dnode->s, len, "[%s \"%s\"]", last->section, last->arg);
 947                 else
 948                         snprintf(dnode->s, len, "[%s]", last->section);
 949         }
 950         conf_report_dump(dumper);
 951         return;
 952
 953 mem_fail:
 954         xlog_warn("conf_report: malloc/calloc failed");
 955         while ((dnode = dumper) != 0) {
 956                 dumper = dumper->next;
 957                 if (dnode->s)
 958                         free(dnode->s);
 959                 free(dnode);
 960         }
 961         return;
 962 }