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 (int);
  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         int 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         if (*line == '#' || *line == ';')
 223                 return;
 224
 225         /* Ignore blank lines */
 226         if (*line == '\0')
 227                 return;
 228
 229         /* Strip off any leading blanks */
 230         while (isblank(*line))
 231                 line++;
 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("conf_parse_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("conf_parse_line: 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("conf_parse_line: %d: ignoring line due to no section",
 294                                         ln);
 295                                 return;
 296                         }
 297                         line[strcspn (line, " \t=")] = '\0';
 298                         val = line + i + 1 + strspn (line + i + 1, " \t");
 299                         /* Skip trailing whitespace, if any */
 300                         for (j = sz - (val - line) - 1; j > 0 && isspace(val[j]); j--)
 301                                 val[j] = '\0';
 302                         /* XXX Perhaps should we not ignore errors?  */
 303                         conf_set(trans, section, arg, line, val, 0, 0);
 304                         return;
 305                 }
 306         }
 307         /* Other non-empty lines are weird.  */
 308         i = strspn(line, " \t");
 309         if (line[i])
 310                 xlog_warn("conf_parse_line: %d: syntax error", ln);
 311
 312         return;
 313 }
 314
 315 /* Parse the mapped configuration file.  */
 316 static void
 317 conf_parse(int trans, char *buf, size_t sz)
 318 {
 319         char *cp = buf;
 320         char *bufend = buf + sz;
 321         char *line;
 322
 323         line = cp;
 324         while (cp < bufend) {
 325                 if (*cp == '\n') {
 326                         /* Check for escaped newlines.  */
 327                         if (cp > buf && *(cp - 1) == '\\')
 328                                 *(cp - 1) = *cp = ' ';
 329                         else {
 330                                 *cp = '\0';
 331                                 conf_parse_line(trans, line, cp - line);
 332                                 line = cp + 1;
 333                         }
 334                 }
 335                 cp++;
 336         }
 337         if (cp != line)
 338                 xlog_warn("conf_parse: last line non-terminated, ignored.");
 339 }
 340
 341 static void
 342 conf_load_defaults(int tr)
 343 {
 344         /* No defaults */
 345         return;
 346 }
 347
 348 void
 349 conf_init (void)
 350 {
 351         unsigned int i;
 352
 353         for (i = 0; i < sizeof conf_bindings / sizeof conf_bindings[0]; i++)
 354                 LIST_INIT (&conf_bindings[i]);
 355
 356         TAILQ_INIT (&conf_trans_queue);
 357         conf_reinit();
 358 }
 359
 360 /* Open the config file and map it into our address space, then parse it.  */
 361 void
 362 conf_reinit(void)
 363 {
 364         struct conf_binding *cb = 0;
 365         int fd, trans;
 366         unsigned int i;
 367         size_t sz;
 368         char *new_conf_addr = 0;
 369         struct stat sb;
 370
 371         if ((stat (conf_path, &sb) == 0) || (errno != ENOENT)) {
 372                 sz = sb.st_size;
 373                 fd = open (conf_path, O_RDONLY, 0);
 374                 if (fd == -1) {
 375                         xlog_warn("conf_reinit: open (\"%s\", O_RDONLY) failed", conf_path);
 376                         return;
 377                 }
 378
 379                 new_conf_addr = malloc(sz);
 380                 if (!new_conf_addr) {
 381                         xlog_warn("conf_reinit: malloc (%lu) failed", (unsigned long)sz);
 382                         goto fail;
 383                 }
 384
 385                 /* XXX I assume short reads won't happen here.  */
 386                 if (read (fd, new_conf_addr, sz) != (int)sz) {
 387                         xlog_warn("conf_reinit: read (%d, %p, %lu) failed",
 388                                 fd, new_conf_addr, (unsigned long)sz);
 389                         goto fail;
 390                 }
 391                 close(fd);
 392
 393                 trans = conf_begin();
 394                 /* XXX Should we not care about errors and rollback?  */
 395                 conf_parse(trans, new_conf_addr, sz);
 396         }
 397         else
 398                 trans = conf_begin();
 399
 400         /* Load default configuration values.  */
 401         conf_load_defaults(trans);
 402
 403         /* Free potential existing configuration.  */
 404         if (conf_addr) {
 405                 for (i = 0; i < sizeof conf_bindings / sizeof conf_bindings[0]; i++) {
 406                         cb = LIST_FIRST (&conf_bindings[i]);
 407                         for (; cb; cb = LIST_FIRST (&conf_bindings[i]))
 408                                 conf_remove_now(cb->section, cb->tag);
 409                 }
 410                 free (conf_addr);
 411         }
 412
 413         conf_end(trans, 1);
 414         conf_addr = new_conf_addr;
 415         return;
 416
 417 fail:
 418         if (new_conf_addr)
 419                 free(new_conf_addr);
 420         close (fd);
 421 }
 422
 423 /*
 424  * Return the numeric value denoted by TAG in section SECTION or DEF
 425  * if that tag does not exist.
 426  */
 427 int
 428 conf_get_num(char *section, char *tag, int def)
 429 {
 430         char *value = conf_get_str(section, tag);
 431
 432         if (value)
 433                 return atoi(value);
 434
 435         return def;
 436 }
 437
 438 /* Validate X according to the range denoted by TAG in section SECTION.  */
 439 int
 440 conf_match_num(char *section, char *tag, int x)
 441 {
 442         char *value = conf_get_str (section, tag);
 443         int val, min, max, n;
 444
 445         if (!value)
 446                 return 0;
 447         n = sscanf (value, "%d,%d:%d", &val, &min, &max);
 448         switch (n) {
 449         case 1:
 450                 xlog(LOG_INFO, "conf_match_num: %s:%s %d==%d?", section, tag, val, x);
 451                 return x == val;
 452         case 3:
 453                 xlog(LOG_INFO, "conf_match_num: %s:%s %d<=%d<=%d?", section,
 454                         tag, min, x, max);
 455                 return min <= x && max >= x;
 456         default:
 457                 xlog(LOG_INFO, "conf_match_num: section %s tag %s: invalid number spec %s",
 458                         section, tag, value);
 459         }
 460         return 0;
 461 }
 462
 463 /* Return the string value denoted by TAG in section SECTION.  */
 464 char *
 465 conf_get_str(char *section, char *tag)
 466 {
 467         struct conf_binding *cb;
 468
 469         cb = LIST_FIRST (&conf_bindings[conf_hash (section)]);
 470         for (; cb; cb = LIST_NEXT (cb, link)) {
 471                 if (strcasecmp (section, cb->section) == 0
 472                                 && strcasecmp (tag, cb->tag) == 0)
 473                         return cb->value;
 474         }
 475         return 0;
 476 }
 477 /*
 478  * Find a section that may or may not have an argument
 479  */
 480 char *
 481 conf_get_section(char *section, char *arg, char *tag)
 482 {
 483         struct conf_binding *cb;
 484
 485         cb = LIST_FIRST (&conf_bindings[conf_hash (section)]);
 486         for (; cb; cb = LIST_NEXT (cb, link)) {
 487                 if (strcasecmp(section, cb->section) != 0)
 488                         continue;
 489                 if (arg && strcasecmp(arg, cb->arg) != 0)
 490                         continue;
 491                 if (strcasecmp(tag, cb->tag) != 0)
 492                         continue;
 493                 return cb->value;
 494         }
 495         return 0;
 496 }
 497
 498 /*
 499  * Build a list of string values out of the comma separated value denoted by
 500  * TAG in SECTION.
 501  */
 502 struct conf_list *
 503 conf_get_list(char *section, char *tag)
 504 {
 505         char *liststr = 0, *p, *field, *t;
 506         struct conf_list *list = 0;
 507         struct conf_list_node *node;
 508
 509         list = malloc (sizeof *list);
 510         if (!list)
 511                 goto cleanup;
 512         TAILQ_INIT (&list->fields);
 513         list->cnt = 0;
 514         liststr = conf_get_str(section, tag);
 515         if (!liststr)
 516                 goto cleanup;
 517         liststr = strdup (liststr);
 518         if (!liststr)
 519                 goto cleanup;
 520         p = liststr;
 521         while ((field = strsep (&p, ",")) != NULL) {
 522                 /* Skip leading whitespace */
 523                 while (isspace (*field))
 524                         field++;
 525                 /* Skip trailing whitespace */
 526                 if (p) {
 527                         for (t = p - 1; t > field && isspace (*t); t--)
 528                                 *t = '\0';
 529                 }
 530                 if (*field == '\0') {
 531                         xlog(LOG_INFO, "conf_get_list: empty field, ignoring...");
 532                         continue;
 533                 }
 534                 list->cnt++;
 535                 node = calloc (1, sizeof *node);
 536                 if (!node)
 537                         goto cleanup;
 538                 node->field = strdup (field);
 539                 if (!node->field) {
 540                         free(node);
 541                         goto cleanup;
 542                 }
 543                 TAILQ_INSERT_TAIL (&list->fields, node, link);
 544         }
 545         free (liststr);
 546         return list;
 547
 548 cleanup:
 549         if (list)
 550                 conf_free_list(list);
 551         if (liststr)
 552                 free(liststr);
 553         return 0;
 554 }
 555
 556 struct conf_list *
 557 conf_get_tag_list(char *section)
 558 {
 559         struct conf_list *list = 0;
 560         struct conf_list_node *node;
 561         struct conf_binding *cb;
 562
 563         list = malloc(sizeof *list);
 564         if (!list)
 565                 goto cleanup;
 566         TAILQ_INIT(&list->fields);
 567         list->cnt = 0;
 568         cb = LIST_FIRST(&conf_bindings[conf_hash (section)]);
 569         for (; cb; cb = LIST_NEXT(cb, link)) {
 570                 if (strcasecmp (section, cb->section) == 0) {
 571                         list->cnt++;
 572                         node = calloc(1, sizeof *node);
 573                         if (!node)
 574                                 goto cleanup;
 575                         node->field = strdup(cb->tag);
 576                         if (!node->field) {
 577                                 free(node);
 578                                 goto cleanup;
 579                         }
 580                         TAILQ_INSERT_TAIL(&list->fields, node, link);
 581                 }
 582         }
 583         return list;
 584
 585 cleanup:
 586         if (list)
 587                 conf_free_list(list);
 588         return 0;
 589 }
 590
 591 /* Decode a PEM encoded buffer.  */
 592 int
 593 conf_decode_base64 (u_int8_t *out, u_int32_t *len, u_char *buf)
 594 {
 595         u_int32_t c = 0;
 596         u_int8_t c1, c2, c3, c4;
 597
 598         while (*buf) {
 599                 if (*buf > 127 || (c1 = asc2bin[*buf]) == 255)
 600                         return 0;
 601
 602                 buf++;
 603                 if (*buf > 127 || (c2 = asc2bin[*buf]) == 255)
 604                         return 0;
 605
 606                 buf++;
 607                 if (*buf == '=') {
 608                         c3 = c4 = 0;
 609                         c++;
 610
 611                         /* Check last four bit */
 612                         if (c2 & 0xF)
 613                                 return 0;
 614
 615                         if (strcmp((char *)buf, "==") == 0)
 616                                 buf++;
 617                         else
 618                                 return 0;
 619                 } else if (*buf > 127 || (c3 = asc2bin[*buf]) == 255)
 620                         return 0;
 621                 else {
 622                         if (*++buf == '=') {
 623                                 c4 = 0;
 624                                 c += 2;
 625
 626                                 /* Check last two bit */
 627                                 if (c3 & 3)
 628                                         return 0;
 629
 630                         if (strcmp((char *)buf, "="))
 631                                 return 0;
 632                         } else if (*buf > 127 || (c4 = asc2bin[*buf]) == 255)
 633                                 return 0;
 634                         else
 635                                 c += 3;
 636                 }
 637
 638                 buf++;
 639                 *out++ = (c1 << 2) | (c2 >> 4);
 640                 *out++ = (c2 << 4) | (c3 >> 2);
 641                 *out++ = (c3 << 6) | c4;
 642         }
 643
 644         *len = c;
 645         return 1;
 646 }
 647
 648 void
 649 conf_free_list(struct conf_list *list)
 650 {
 651         struct conf_list_node *node = TAILQ_FIRST(&list->fields);
 652
 653         while (node) {
 654                 TAILQ_REMOVE(&list->fields, node, link);
 655                 if (node->field)
 656                         free(node->field);
 657                 free (node);
 658                 node = TAILQ_FIRST(&list->fields);
 659         }
 660         free (list);
 661 }
 662
 663 int
 664 conf_begin(void)
 665 {
 666   static int seq = 0;
 667
 668   return ++seq;
 669 }
 670
 671 static struct conf_trans *
 672 conf_trans_node(int transaction, enum conf_op op)
 673 {
 674         struct conf_trans *node;
 675
 676         node = calloc (1, sizeof *node);
 677         if (!node) {
 678                 xlog_warn("conf_trans_node: calloc (1, %lu) failed",
 679                 (unsigned long)sizeof *node);
 680                 return 0;
 681         }
 682         node->trans = transaction;
 683         node->op = op;
 684         TAILQ_INSERT_TAIL (&conf_trans_queue, node, link);
 685         return node;
 686 }
 687
 688 /* Queue a set operation.  */
 689 static int
 690 conf_set(int transaction, char *section, char *arg,
 691         char *tag, char *value, int override, int is_default)
 692 {
 693         struct conf_trans *node;
 694
 695         node = conf_trans_node(transaction, CONF_SET);
 696         if (!node)
 697                 return 1;
 698         node->section = strdup(section);
 699         if (!node->section) {
 700                 xlog_warn("conf_set: strdup(\"%s\") failed", section);
 701                 goto fail;
 702         }
 703         /* Make Section names case-insensitive */
 704         upper2lower(node->section);
 705
 706         if (arg) {
 707                 node->arg = strdup(arg);
 708                 if (!node->arg) {
 709                         xlog_warn("conf_set: strdup(\"%s\") failed", arg);
 710                         goto fail;
 711                 }
 712         } else
 713                 node->arg = NULL;
 714
 715         node->tag = strdup(tag);
 716         if (!node->tag) {
 717                 xlog_warn("conf_set: strdup(\"%s\") failed", tag);
 718                 goto fail;
 719         }
 720         node->value = strdup(value);
 721         if (!node->value) {
 722                 xlog_warn("conf_set: strdup(\"%s\") failed", value);
 723                 goto fail;
 724         }
 725         node->override = override;
 726         node->is_default = is_default;
 727         return 0;
 728
 729 fail:
 730         if (node->tag)
 731                 free(node->tag);
 732         if (node->section)
 733                 free(node->section);
 734         if (node)
 735                 free(node);
 736         return 1;
 737 }
 738
 739 /* Queue a remove operation.  */
 740 int
 741 conf_remove(int transaction, char *section, char *tag)
 742 {
 743         struct conf_trans *node;
 744
 745         node = conf_trans_node(transaction, CONF_REMOVE);
 746         if (!node)
 747                 goto fail;
 748         node->section = strdup(section);
 749         if (!node->section) {
 750                 xlog_warn("conf_remove: strdup(\"%s\") failed", section);
 751                 goto fail;
 752         }
 753         node->tag = strdup(tag);
 754         if (!node->tag) {
 755                 xlog_warn("conf_remove: strdup(\"%s\") failed", tag);
 756                 goto fail;
 757         }
 758         return 0;
 759
 760 fail:
 761         if (node && node->section)
 762                 free (node->section);
 763         if (node)
 764                 free (node);
 765         return 1;
 766 }
 767
 768 /* Queue a remove section operation.  */
 769 int
 770 conf_remove_section(int transaction, char *section)
 771 {
 772         struct conf_trans *node;
 773
 774         node = conf_trans_node(transaction, CONF_REMOVE_SECTION);
 775         if (!node)
 776                 goto fail;
 777         node->section = strdup(section);
 778         if (!node->section) {
 779                 xlog_warn("conf_remove_section: strdup(\"%s\") failed", section);
 780                 goto fail;
 781         }
 782         return 0;
 783
 784 fail:
 785         if (node)
 786                 free(node);
 787         return 1;
 788 }
 789
 790 /* Execute all queued operations for this transaction.  Cleanup.  */
 791 int
 792 conf_end(int transaction, int commit)
 793 {
 794         struct conf_trans *node, *next;
 795
 796         for (node = TAILQ_FIRST(&conf_trans_queue); node; node = next) {
 797                 next = TAILQ_NEXT(node, link);
 798                 if (node->trans == transaction) {
 799                         if (commit) {
 800                                 switch (node->op) {
 801                                 case CONF_SET:
 802                                         conf_set_now(node->section, node->arg,
 803                                                 node->tag, node->value, node->override,
 804                                                 node->is_default);
 805                                         break;
 806                                 case CONF_REMOVE:
 807                                         conf_remove_now(node->section, node->tag);
 808                                         break;
 809                                 case CONF_REMOVE_SECTION:
 810                                         conf_remove_section_now(node->section);
 811                                         break;
 812                                 default:
 813                                         xlog(LOG_INFO, "conf_end: unknown operation: %d", node->op);
 814                                 }
 815                         }
 816                         TAILQ_REMOVE (&conf_trans_queue, node, link);
 817                         if (node->section)
 818                                 free(node->section);
 819                         if (node->tag)
 820                                 free(node->tag);
 821                         if (node->value)
 822                                 free(node->value);
 823                         free (node);
 824                 }
 825         }
 826         return 0;
 827 }
 828
 829 /*
 830  * Dump running configuration upon SIGUSR1.
 831  * Configuration is "stored in reverse order", so reverse it again.
 832  */
 833 struct dumper {
 834         char *s, *v;
 835         struct dumper *next;
 836 };
 837
 838 static void
 839 conf_report_dump(struct dumper *node)
 840 {
 841         /* Recursive, cleanup when we're done.  */
 842         if (node->next)
 843                 conf_report_dump(node->next);
 844
 845         if (node->v)
 846                 xlog(LOG_INFO, "%s=\t%s", node->s, node->v);
 847         else if (node->s) {
 848                 xlog(LOG_INFO, "%s", node->s);
 849                 if (strlen(node->s) > 0)
 850                         free(node->s);
 851         }
 852
 853         free (node);
 854 }
 855
 856 void
 857 conf_report (void)
 858 {
 859         struct conf_binding *cb, *last = 0;
 860         unsigned int i, len, diff_arg = 0;
 861         char *current_section = (char *)0;
 862         char *current_arg = (char *)0;
 863         struct dumper *dumper, *dnode;
 864
 865         dumper = dnode = (struct dumper *)calloc(1, sizeof *dumper);
 866         if (!dumper)
 867                 goto mem_fail;
 868
 869         xlog(LOG_INFO, "conf_report: dumping running configuration");
 870
 871         for (i = 0; i < sizeof conf_bindings / sizeof conf_bindings[0]; i++)
 872                 for (cb = LIST_FIRST(&conf_bindings[i]); cb; cb = LIST_NEXT(cb, link)) {
 873                         if (!cb->is_default) {
 874                                 /* Make sure the Section arugment is the same */
 875                                 if (current_arg && current_section && cb->arg) {
 876                                         if (strcmp(cb->section, current_section) == 0 &&
 877                                                 strcmp(cb->arg, current_arg) != 0)
 878                                         diff_arg = 1;
 879                                 }
 880                                 /* Dump this entry.  */
 881                                 if (!current_section || strcmp(cb->section, current_section)
 882                                                         || diff_arg) {
 883                                         if (current_section || diff_arg) {
 884                                                 len = strlen (current_section) + 3;
 885                                                 if (current_arg)
 886                                                         len += strlen(current_arg) + 3;
 887                                                 dnode->s = malloc(len);
 888                                                 if (!dnode->s)
 889                                                         goto mem_fail;
 890
 891                                                 if (current_arg)
 892                                                         snprintf(dnode->s, len, "[%s \"%s\"]",
 893                                                                 current_section, current_arg);
 894                                                 else
 895                                                         snprintf(dnode->s, len, "[%s]", current_section);
 896
 897                                                 dnode->next =
 898                                                         (struct dumper *)calloc(1, sizeof (struct dumper));
 899                                                 dnode = dnode->next;
 900                                                 if (!dnode)
 901                                                         goto mem_fail;
 902
 903                                                 dnode->s = "";
 904                                                 dnode->next =
 905                                                         (struct dumper *)calloc(1, sizeof (struct dumper));
 906                                                 dnode = dnode->next;
 907                                                 if (!dnode)
 908                                                 goto mem_fail;
 909                                         }
 910                                         current_section = cb->section;
 911                                         current_arg = cb->arg;
 912                                         diff_arg = 0;
 913                                 }
 914                                 dnode->s = cb->tag;
 915                                 dnode->v = cb->value;
 916                                 dnode->next = (struct dumper *)calloc (1, sizeof (struct dumper));
 917                                 dnode = dnode->next;
 918                                 if (!dnode)
 919                                         goto mem_fail;
 920                                 last = cb;
 921                 }
 922         }
 923
 924         if (last) {
 925                 len = strlen(last->section) + 3;
 926                 if (last->arg)
 927                         len += strlen(last->arg) + 3;
 928                 dnode->s = malloc(len);
 929                 if (!dnode->s)
 930                         goto mem_fail;
 931                 if (last->arg)
 932                         snprintf(dnode->s, len, "[%s \"%s\"]", last->section, last->arg);
 933                 else
 934                         snprintf(dnode->s, len, "[%s]", last->section);
 935         }
 936         conf_report_dump(dumper);
 937         return;
 938
 939 mem_fail:
 940         xlog_warn("conf_report: malloc/calloc failed");
 941         while ((dnode = dumper) != 0) {
 942                 dumper = dumper->next;
 943                 if (dnode->s)
 944                         free(dnode->s);
 945                 free(dnode);
 946         }
 947         return;
 948 }