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, valsize;
 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                 j=0;
 255                 while (*val && !isblank(*val))
 256                         val++, j++;
 257                 if (*val)
 258                         i = j;
 259                 section = malloc(i+1);
 260                 if (!section) {
 261                         xlog_warn("conf_parse_line: %d: malloc (%lu) failed", ln,
 262                                                 (unsigned long)i);
 263                         return;
 264                 }
 265                 strncpy(section, line, i);
 266                 section[i] = '\0';
 267
 268                 if (arg)
 269                         free(arg);
 270                 arg = 0;
 271
 272                 ptr = strchr(val, '"');
 273                 if (ptr == NULL)
 274                         return;
 275                 line = ++ptr;
 276                 while (*ptr && *ptr != '"' && *ptr != ']')
 277                         ptr++;
 278                 if (*ptr == '\0' || *ptr == ']') {
 279                         xlog_warn("config file error: line %d: "
 280                                 "non-matched '\"', ignoring until next section", ln);
 281                 }  else {
 282                         *ptr = '\0';
 283                         arg = strdup(line);
 284                         if (!arg)
 285                                 xlog_warn("conf_parse_line: %d: malloc arg failed", ln);
 286                 }
 287                 return;
 288         }
 289
 290         /* Deal with assignments.  */
 291         for (i = 0; i < sz; i++) {
 292                 if (line[i] == '=') {
 293                         /* If no section, we are ignoring the lines.  */
 294                         if (!section) {
 295                         xlog_warn("config file error: line %d: "
 296                                 "ignoring line due to no section", ln);
 297                                 return;
 298                         }
 299                         line[strcspn (line, " \t=")] = '\0';
 300                         val = line + i + 1 + strspn (line + i + 1, " \t");
 301                         valsize = 0;
 302                         while (val[valsize++]);
 303
 304                         /* Skip trailing spaces and comments */
 305                         for (j = 0; j < valsize; j++) {
 306                                 if (val[j] == '#' || val[j] == ';' || isspace(val[j])) {
 307                                         val[j] = '\0';
 308                                         break;
 309                                 }
 310                         }
 311                         /* XXX Perhaps should we not ignore errors?  */
 312                         conf_set(trans, section, arg, line, val, 0, 0);
 313                         return;
 314                 }
 315         }
 316         /* Other non-empty lines are weird.  */
 317         i = strspn(line, " \t");
 318         if (line[i])
 319                 xlog_warn("config file error: line %d:", ln);
 320
 321         return;
 322 }
 323
 324 /* Parse the mapped configuration file.  */
 325 static void
 326 conf_parse(int trans, char *buf, size_t sz)
 327 {
 328         char *cp = buf;
 329         char *bufend = buf + sz;
 330         char *line;
 331
 332         line = cp;
 333         while (cp < bufend) {
 334                 if (*cp == '\n') {
 335                         /* Check for escaped newlines.  */
 336                         if (cp > buf && *(cp - 1) == '\\')
 337                                 *(cp - 1) = *cp = ' ';
 338                         else {
 339                                 *cp = '\0';
 340                                 conf_parse_line(trans, line, cp - line);
 341                                 line = cp + 1;
 342                         }
 343                 }
 344                 cp++;
 345         }
 346         if (cp != line)
 347                 xlog_warn("conf_parse: last line non-terminated, ignored.");
 348 }
 349
 350 static void
 351 conf_load_defaults(void)
 352 {
 353         /* No defaults */
 354         return;
 355 }
 356
 357 void
 358 conf_init (void)
 359 {
 360         unsigned int i;
 361
 362         for (i = 0; i < sizeof conf_bindings / sizeof conf_bindings[0]; i++)
 363                 LIST_INIT (&conf_bindings[i]);
 364
 365         TAILQ_INIT (&conf_trans_queue);
 366         conf_reinit();
 367 }
 368
 369 /* Open the config file and map it into our address space, then parse it.  */
 370 void
 371 conf_reinit(void)
 372 {
 373         struct conf_binding *cb = 0;
 374         int fd, trans;
 375         unsigned int i;
 376         size_t sz;
 377         char *new_conf_addr = 0;
 378         struct stat sb;
 379
 380         if ((stat (conf_path, &sb) == 0) || (errno != ENOENT)) {
 381                 sz = sb.st_size;
 382                 fd = open (conf_path, O_RDONLY, 0);
 383                 if (fd == -1) {
 384                         xlog_warn("conf_reinit: open (\"%s\", O_RDONLY) failed", conf_path);
 385                         return;
 386                 }
 387
 388                 new_conf_addr = malloc(sz);
 389                 if (!new_conf_addr) {
 390                         xlog_warn("conf_reinit: malloc (%lu) failed", (unsigned long)sz);
 391                         goto fail;
 392                 }
 393
 394                 /* XXX I assume short reads won't happen here.  */
 395                 if (read (fd, new_conf_addr, sz) != (int)sz) {
 396                         xlog_warn("conf_reinit: read (%d, %p, %lu) failed",
 397                                 fd, new_conf_addr, (unsigned long)sz);
 398                         goto fail;
 399                 }
 400                 close(fd);
 401
 402                 trans = conf_begin();
 403                 /* XXX Should we not care about errors and rollback?  */
 404                 conf_parse(trans, new_conf_addr, sz);
 405         }
 406         else
 407                 trans = conf_begin();
 408
 409         /* Load default configuration values.  */
 410         conf_load_defaults();
 411
 412         /* Free potential existing configuration.  */
 413         if (conf_addr) {
 414                 for (i = 0; i < sizeof conf_bindings / sizeof conf_bindings[0]; i++) {
 415                         cb = LIST_FIRST (&conf_bindings[i]);
 416                         for (; cb; cb = LIST_FIRST (&conf_bindings[i]))
 417                                 conf_remove_now(cb->section, cb->tag);
 418                 }
 419                 free (conf_addr);
 420         }
 421
 422         conf_end(trans, 1);
 423         conf_addr = new_conf_addr;
 424         return;
 425
 426 fail:
 427         if (new_conf_addr)
 428                 free(new_conf_addr);
 429         close (fd);
 430 }
 431
 432 /*
 433  * Return the numeric value denoted by TAG in section SECTION or DEF
 434  * if that tag does not exist.
 435  */
 436 int
 437 conf_get_num(char *section, char *tag, int def)
 438 {
 439         char *value = conf_get_str(section, tag);
 440
 441         if (value)
 442                 return atoi(value);
 443
 444         return def;
 445 }
 446
 447 /* Validate X according to the range denoted by TAG in section SECTION.  */
 448 int
 449 conf_match_num(char *section, char *tag, int x)
 450 {
 451         char *value = conf_get_str (section, tag);
 452         int val, min, max, n;
 453
 454         if (!value)
 455                 return 0;
 456         n = sscanf (value, "%d,%d:%d", &val, &min, &max);
 457         switch (n) {
 458         case 1:
 459                 xlog(LOG_INFO, "conf_match_num: %s:%s %d==%d?", section, tag, val, x);
 460                 return x == val;
 461         case 3:
 462                 xlog(LOG_INFO, "conf_match_num: %s:%s %d<=%d<=%d?", section,
 463                         tag, min, x, max);
 464                 return min <= x && max >= x;
 465         default:
 466                 xlog(LOG_INFO, "conf_match_num: section %s tag %s: invalid number spec %s",
 467                         section, tag, value);
 468         }
 469         return 0;
 470 }
 471
 472 /* Return the string value denoted by TAG in section SECTION.  */
 473 char *
 474 conf_get_str(char *section, char *tag)
 475 {
 476         struct conf_binding *cb;
 477
 478         cb = LIST_FIRST (&conf_bindings[conf_hash (section)]);
 479         for (; cb; cb = LIST_NEXT (cb, link)) {
 480                 if (strcasecmp (section, cb->section) == 0
 481                                 && strcasecmp (tag, cb->tag) == 0)
 482                         return cb->value;
 483         }
 484         return 0;
 485 }
 486 /*
 487  * Find a section that may or may not have an argument
 488  */
 489 char *
 490 conf_get_section(char *section, char *arg, char *tag)
 491 {
 492         struct conf_binding *cb;
 493
 494         cb = LIST_FIRST (&conf_bindings[conf_hash (section)]);
 495         for (; cb; cb = LIST_NEXT (cb, link)) {
 496                 if (strcasecmp(section, cb->section) != 0)
 497                         continue;
 498                 if (arg && strcasecmp(arg, cb->arg) != 0)
 499                         continue;
 500                 if (strcasecmp(tag, cb->tag) != 0)
 501                         continue;
 502                 return cb->value;
 503         }
 504         return 0;
 505 }
 506
 507 /*
 508  * Build a list of string values out of the comma separated value denoted by
 509  * TAG in SECTION.
 510  */
 511 struct conf_list *
 512 conf_get_list(char *section, char *tag)
 513 {
 514         char *liststr = 0, *p, *field, *t;
 515         struct conf_list *list = 0;
 516         struct conf_list_node *node;
 517
 518         list = malloc (sizeof *list);
 519         if (!list)
 520                 goto cleanup;
 521         TAILQ_INIT (&list->fields);
 522         list->cnt = 0;
 523         liststr = conf_get_str(section, tag);
 524         if (!liststr)
 525                 goto cleanup;
 526         liststr = strdup (liststr);
 527         if (!liststr)
 528                 goto cleanup;
 529         p = liststr;
 530         while ((field = strsep (&p, ",")) != NULL) {
 531                 /* Skip leading whitespace */
 532                 while (isspace (*field))
 533                         field++;
 534                 /* Skip trailing whitespace */
 535                 if (p) {
 536                         for (t = p - 1; t > field && isspace (*t); t--)
 537                                 *t = '\0';
 538                 }
 539                 if (*field == '\0') {
 540                         xlog(LOG_INFO, "conf_get_list: empty field, ignoring...");
 541                         continue;
 542                 }
 543                 list->cnt++;
 544                 node = calloc (1, sizeof *node);
 545                 if (!node)
 546                         goto cleanup;
 547                 node->field = strdup (field);
 548                 if (!node->field) {
 549                         free(node);
 550                         goto cleanup;
 551                 }
 552                 TAILQ_INSERT_TAIL (&list->fields, node, link);
 553         }
 554         free (liststr);
 555         return list;
 556
 557 cleanup:
 558         if (list)
 559                 conf_free_list(list);
 560         if (liststr)
 561                 free(liststr);
 562         return 0;
 563 }
 564
 565 struct conf_list *
 566 conf_get_tag_list(char *section)
 567 {
 568         struct conf_list *list = 0;
 569         struct conf_list_node *node;
 570         struct conf_binding *cb;
 571
 572         list = malloc(sizeof *list);
 573         if (!list)
 574                 goto cleanup;
 575         TAILQ_INIT(&list->fields);
 576         list->cnt = 0;
 577         cb = LIST_FIRST(&conf_bindings[conf_hash (section)]);
 578         for (; cb; cb = LIST_NEXT(cb, link)) {
 579                 if (strcasecmp (section, cb->section) == 0) {
 580                         list->cnt++;
 581                         node = calloc(1, sizeof *node);
 582                         if (!node)
 583                                 goto cleanup;
 584                         node->field = strdup(cb->tag);
 585                         if (!node->field) {
 586                                 free(node);
 587                                 goto cleanup;
 588                         }
 589                         TAILQ_INSERT_TAIL(&list->fields, node, link);
 590                 }
 591         }
 592         return list;
 593
 594 cleanup:
 595         if (list)
 596                 conf_free_list(list);
 597         return 0;
 598 }
 599
 600 /* Decode a PEM encoded buffer.  */
 601 int
 602 conf_decode_base64 (u_int8_t *out, u_int32_t *len, u_char *buf)
 603 {
 604         u_int32_t c = 0;
 605         u_int8_t c1, c2, c3, c4;
 606
 607         while (*buf) {
 608                 if (*buf > 127 || (c1 = asc2bin[*buf]) == 255)
 609                         return 0;
 610
 611                 buf++;
 612                 if (*buf > 127 || (c2 = asc2bin[*buf]) == 255)
 613                         return 0;
 614
 615                 buf++;
 616                 if (*buf == '=') {
 617                         c3 = c4 = 0;
 618                         c++;
 619
 620                         /* Check last four bit */
 621                         if (c2 & 0xF)
 622                                 return 0;
 623
 624                         if (strcmp((char *)buf, "==") == 0)
 625                                 buf++;
 626                         else
 627                                 return 0;
 628                 } else if (*buf > 127 || (c3 = asc2bin[*buf]) == 255)
 629                         return 0;
 630                 else {
 631                         if (*++buf == '=') {
 632                                 c4 = 0;
 633                                 c += 2;
 634
 635                                 /* Check last two bit */
 636                                 if (c3 & 3)
 637                                         return 0;
 638
 639                         if (strcmp((char *)buf, "="))
 640                                 return 0;
 641                         } else if (*buf > 127 || (c4 = asc2bin[*buf]) == 255)
 642                                 return 0;
 643                         else
 644                                 c += 3;
 645                 }
 646
 647                 buf++;
 648                 *out++ = (c1 << 2) | (c2 >> 4);
 649                 *out++ = (c2 << 4) | (c3 >> 2);
 650                 *out++ = (c3 << 6) | c4;
 651         }
 652
 653         *len = c;
 654         return 1;
 655 }
 656
 657 void
 658 conf_free_list(struct conf_list *list)
 659 {
 660         struct conf_list_node *node = TAILQ_FIRST(&list->fields);
 661
 662         while (node) {
 663                 TAILQ_REMOVE(&list->fields, node, link);
 664                 if (node->field)
 665                         free(node->field);
 666                 free (node);
 667                 node = TAILQ_FIRST(&list->fields);
 668         }
 669         free (list);
 670 }
 671
 672 int
 673 conf_begin(void)
 674 {
 675   static int seq = 0;
 676
 677   return ++seq;
 678 }
 679
 680 static struct conf_trans *
 681 conf_trans_node(int transaction, enum conf_op op)
 682 {
 683         struct conf_trans *node;
 684
 685         node = calloc (1, sizeof *node);
 686         if (!node) {
 687                 xlog_warn("conf_trans_node: calloc (1, %lu) failed",
 688                 (unsigned long)sizeof *node);
 689                 return 0;
 690         }
 691         node->trans = transaction;
 692         node->op = op;
 693         TAILQ_INSERT_TAIL (&conf_trans_queue, node, link);
 694         return node;
 695 }
 696
 697 /* Queue a set operation.  */
 698 static int
 699 conf_set(int transaction, char *section, char *arg,
 700         char *tag, char *value, int override, int is_default)
 701 {
 702         struct conf_trans *node;
 703
 704         node = conf_trans_node(transaction, CONF_SET);
 705         if (!node)
 706                 return 1;
 707         node->section = strdup(section);
 708         if (!node->section) {
 709                 xlog_warn("conf_set: strdup(\"%s\") failed", section);
 710                 goto fail;
 711         }
 712         /* Make Section names case-insensitive */
 713         upper2lower(node->section);
 714
 715         if (arg) {
 716                 node->arg = strdup(arg);
 717                 if (!node->arg) {
 718                         xlog_warn("conf_set: strdup(\"%s\") failed", arg);
 719                         goto fail;
 720                 }
 721         } else
 722                 node->arg = NULL;
 723
 724         node->tag = strdup(tag);
 725         if (!node->tag) {
 726                 xlog_warn("conf_set: strdup(\"%s\") failed", tag);
 727                 goto fail;
 728         }
 729         node->value = strdup(value);
 730         if (!node->value) {
 731                 xlog_warn("conf_set: strdup(\"%s\") failed", value);
 732                 goto fail;
 733         }
 734         node->override = override;
 735         node->is_default = is_default;
 736         return 0;
 737
 738 fail:
 739         if (node->tag)
 740                 free(node->tag);
 741         if (node->section)
 742                 free(node->section);
 743         if (node)
 744                 free(node);
 745         return 1;
 746 }
 747
 748 /* Queue a remove operation.  */
 749 int
 750 conf_remove(int transaction, char *section, char *tag)
 751 {
 752         struct conf_trans *node;
 753
 754         node = conf_trans_node(transaction, CONF_REMOVE);
 755         if (!node)
 756                 goto fail;
 757         node->section = strdup(section);
 758         if (!node->section) {
 759                 xlog_warn("conf_remove: strdup(\"%s\") failed", section);
 760                 goto fail;
 761         }
 762         node->tag = strdup(tag);
 763         if (!node->tag) {
 764                 xlog_warn("conf_remove: strdup(\"%s\") failed", tag);
 765                 goto fail;
 766         }
 767         return 0;
 768
 769 fail:
 770         if (node && node->section)
 771                 free (node->section);
 772         if (node)
 773                 free (node);
 774         return 1;
 775 }
 776
 777 /* Queue a remove section operation.  */
 778 int
 779 conf_remove_section(int transaction, char *section)
 780 {
 781         struct conf_trans *node;
 782
 783         node = conf_trans_node(transaction, CONF_REMOVE_SECTION);
 784         if (!node)
 785                 goto fail;
 786         node->section = strdup(section);
 787         if (!node->section) {
 788                 xlog_warn("conf_remove_section: strdup(\"%s\") failed", section);
 789                 goto fail;
 790         }
 791         return 0;
 792
 793 fail:
 794         if (node)
 795                 free(node);
 796         return 1;
 797 }
 798
 799 /* Execute all queued operations for this transaction.  Cleanup.  */
 800 int
 801 conf_end(int transaction, int commit)
 802 {
 803         struct conf_trans *node, *next;
 804
 805         for (node = TAILQ_FIRST(&conf_trans_queue); node; node = next) {
 806                 next = TAILQ_NEXT(node, link);
 807                 if (node->trans == transaction) {
 808                         if (commit) {
 809                                 switch (node->op) {
 810                                 case CONF_SET:
 811                                         conf_set_now(node->section, node->arg,
 812                                                 node->tag, node->value, node->override,
 813                                                 node->is_default);
 814                                         break;
 815                                 case CONF_REMOVE:
 816                                         conf_remove_now(node->section, node->tag);
 817                                         break;
 818                                 case CONF_REMOVE_SECTION:
 819                                         conf_remove_section_now(node->section);
 820                                         break;
 821                                 default:
 822                                         xlog(LOG_INFO, "conf_end: unknown operation: %d", node->op);
 823                                 }
 824                         }
 825                         TAILQ_REMOVE (&conf_trans_queue, node, link);
 826                         if (node->section)
 827                                 free(node->section);
 828                         if (node->tag)
 829                                 free(node->tag);
 830                         if (node->value)
 831                                 free(node->value);
 832                         free (node);
 833                 }
 834         }
 835         return 0;
 836 }
 837
 838 /*
 839  * Dump running configuration upon SIGUSR1.
 840  * Configuration is "stored in reverse order", so reverse it again.
 841  */
 842 struct dumper {
 843         char *s, *v;
 844         struct dumper *next;
 845 };
 846
 847 static void
 848 conf_report_dump(struct dumper *node)
 849 {
 850         /* Recursive, cleanup when we're done.  */
 851         if (node->next)
 852                 conf_report_dump(node->next);
 853
 854         if (node->v)
 855                 xlog(LOG_INFO, "%s=\t%s", node->s, node->v);
 856         else if (node->s) {
 857                 xlog(LOG_INFO, "%s", node->s);
 858                 if (strlen(node->s) > 0)
 859                         free(node->s);
 860         }
 861
 862         free (node);
 863 }
 864
 865 void
 866 conf_report (void)
 867 {
 868         struct conf_binding *cb, *last = 0;
 869         unsigned int i, len, diff_arg = 0;
 870         char *current_section = (char *)0;
 871         char *current_arg = (char *)0;
 872         struct dumper *dumper, *dnode;
 873
 874         dumper = dnode = (struct dumper *)calloc(1, sizeof *dumper);
 875         if (!dumper)
 876                 goto mem_fail;
 877
 878         xlog(LOG_INFO, "conf_report: dumping running configuration");
 879
 880         for (i = 0; i < sizeof conf_bindings / sizeof conf_bindings[0]; i++)
 881                 for (cb = LIST_FIRST(&conf_bindings[i]); cb; cb = LIST_NEXT(cb, link)) {
 882                         if (!cb->is_default) {
 883                                 /* Make sure the Section arugment is the same */
 884                                 if (current_arg && current_section && cb->arg) {
 885                                         if (strcmp(cb->section, current_section) == 0 &&
 886                                                 strcmp(cb->arg, current_arg) != 0)
 887                                         diff_arg = 1;
 888                                 }
 889                                 /* Dump this entry.  */
 890                                 if (!current_section || strcmp(cb->section, current_section)
 891                                                         || diff_arg) {
 892                                         if (current_section || diff_arg) {
 893                                                 len = strlen (current_section) + 3;
 894                                                 if (current_arg)
 895                                                         len += strlen(current_arg) + 3;
 896                                                 dnode->s = malloc(len);
 897                                                 if (!dnode->s)
 898                                                         goto mem_fail;
 899
 900                                                 if (current_arg)
 901                                                         snprintf(dnode->s, len, "[%s \"%s\"]",
 902                                                                 current_section, current_arg);
 903                                                 else
 904                                                         snprintf(dnode->s, len, "[%s]", current_section);
 905
 906                                                 dnode->next =
 907                                                         (struct dumper *)calloc(1, sizeof (struct dumper));
 908                                                 dnode = dnode->next;
 909                                                 if (!dnode)
 910                                                         goto mem_fail;
 911
 912                                                 dnode->s = "";
 913                                                 dnode->next =
 914                                                         (struct dumper *)calloc(1, sizeof (struct dumper));
 915                                                 dnode = dnode->next;
 916                                                 if (!dnode)
 917                                                 goto mem_fail;
 918                                         }
 919                                         current_section = cb->section;
 920                                         current_arg = cb->arg;
 921                                         diff_arg = 0;
 922                                 }
 923                                 dnode->s = cb->tag;
 924                                 dnode->v = cb->value;
 925                                 dnode->next = (struct dumper *)calloc (1, sizeof (struct dumper));
 926                                 dnode = dnode->next;
 927                                 if (!dnode)
 928                                         goto mem_fail;
 929                                 last = cb;
 930                 }
 931         }
 932
 933         if (last) {
 934                 len = strlen(last->section) + 3;
 935                 if (last->arg)
 936                         len += strlen(last->arg) + 3;
 937                 dnode->s = malloc(len);
 938                 if (!dnode->s)
 939                         goto mem_fail;
 940                 if (last->arg)
 941                         snprintf(dnode->s, len, "[%s \"%s\"]", last->section, last->arg);
 942                 else
 943                         snprintf(dnode->s, len, "[%s]", last->section);
 944         }
 945         conf_report_dump(dumper);
 946         return;
 947
 948 mem_fail:
 949         xlog_warn("conf_report: malloc/calloc failed");
 950         while ((dnode = dumper) != 0) {
 951                 dumper = dumper->next;
 952                 if (dnode->s)
 953                         free(dnode->s);
 954                 free(dnode);
 955         }
 956         return;
 957 }