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                 j=0;
 255                 while (*val && !isblank(*val))
 256                         val++, j++;
 257                 if (*val)
 258                         i = j;
 259                 section = malloc(i);
 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
 267                 if (arg)
 268                         free(arg);
 269                 arg = 0;
 270
 271                 ptr = strchr(val, '"');
 272                 if (ptr == NULL)
 273                         return;
 274                 line = ++ptr;
 275                 while (*ptr && *ptr != '"' && *ptr != ']')
 276                         ptr++;
 277                 if (*ptr == '\0' || *ptr == ']') {
 278                         xlog_warn("config file error: line %d: "
 279                                 "non-matched '\"', ignoring until next section", ln);
 280                 }  else {
 281                         *ptr = '\0';
 282                         arg = strdup(line);
 283                         if (!arg)
 284                                 xlog_warn("conf_parse_line: %d: malloc arg failed", ln);
 285                 }
 286                 return;
 287         }
 288
 289         /* Deal with assignments.  */
 290         for (i = 0; i < sz; i++) {
 291                 if (line[i] == '=') {
 292                         /* If no section, we are ignoring the lines.  */
 293                         if (!section) {
 294                         xlog_warn("config file error: line %d: "
 295                                 "ignoring line due to no section", ln);
 296                                 return;
 297                         }
 298                         line[strcspn (line, " \t=")] = '\0';
 299                         val = line + i + 1 + strspn (line + i + 1, " \t");
 300
 301                         /* Skip trailing comments, if any */
 302                         for (j = 0; j < sz - (val - line); j++) {
 303                                 if (val[j] == '#' || val[j] == ';') {
 304                                         val[j] = '\0';
 305                                         break;
 306                                 }
 307                         }
 308
 309                         /* Skip trailing whitespace, if any */
 310                         for (j--; j > 0; j--) {
 311                                 if (isspace(val[j]))
 312                                         val[j] = '\0';
 313                                 else
 314                                         break;
 315                         }
 316
 317                         /* XXX Perhaps should we not ignore errors?  */
 318                         conf_set(trans, section, arg, line, val, 0, 0);
 319                         return;
 320                 }
 321         }
 322         /* Other non-empty lines are weird.  */
 323         i = strspn(line, " \t");
 324         if (line[i])
 325                 xlog_warn("config file error: line %d:", ln);
 326
 327         return;
 328 }
 329
 330 /* Parse the mapped configuration file.  */
 331 static void
 332 conf_parse(int trans, char *buf, size_t sz)
 333 {
 334         char *cp = buf;
 335         char *bufend = buf + sz;
 336         char *line;
 337
 338         line = cp;
 339         while (cp < bufend) {
 340                 if (*cp == '\n') {
 341                         /* Check for escaped newlines.  */
 342                         if (cp > buf && *(cp - 1) == '\\')
 343                                 *(cp - 1) = *cp = ' ';
 344                         else {
 345                                 *cp = '\0';
 346                                 conf_parse_line(trans, line, cp - line);
 347                                 line = cp + 1;
 348                         }
 349                 }
 350                 cp++;
 351         }
 352         if (cp != line)
 353                 xlog_warn("conf_parse: last line non-terminated, ignored.");
 354 }
 355
 356 static void
 357 conf_load_defaults(void)
 358 {
 359         /* No defaults */
 360         return;
 361 }
 362
 363 void
 364 conf_init (void)
 365 {
 366         unsigned int i;
 367
 368         for (i = 0; i < sizeof conf_bindings / sizeof conf_bindings[0]; i++)
 369                 LIST_INIT (&conf_bindings[i]);
 370
 371         TAILQ_INIT (&conf_trans_queue);
 372         conf_reinit();
 373 }
 374
 375 /* Open the config file and map it into our address space, then parse it.  */
 376 void
 377 conf_reinit(void)
 378 {
 379         struct conf_binding *cb = 0;
 380         int fd, trans;
 381         unsigned int i;
 382         size_t sz;
 383         char *new_conf_addr = 0;
 384         struct stat sb;
 385
 386         if ((stat (conf_path, &sb) == 0) || (errno != ENOENT)) {
 387                 sz = sb.st_size;
 388                 fd = open (conf_path, O_RDONLY, 0);
 389                 if (fd == -1) {
 390                         xlog_warn("conf_reinit: open (\"%s\", O_RDONLY) failed", conf_path);
 391                         return;
 392                 }
 393
 394                 new_conf_addr = malloc(sz);
 395                 if (!new_conf_addr) {
 396                         xlog_warn("conf_reinit: malloc (%lu) failed", (unsigned long)sz);
 397                         goto fail;
 398                 }
 399
 400                 /* XXX I assume short reads won't happen here.  */
 401                 if (read (fd, new_conf_addr, sz) != (int)sz) {
 402                         xlog_warn("conf_reinit: read (%d, %p, %lu) failed",
 403                                 fd, new_conf_addr, (unsigned long)sz);
 404                         goto fail;
 405                 }
 406                 close(fd);
 407
 408                 trans = conf_begin();
 409                 /* XXX Should we not care about errors and rollback?  */
 410                 conf_parse(trans, new_conf_addr, sz);
 411         }
 412         else
 413                 trans = conf_begin();
 414
 415         /* Load default configuration values.  */
 416         conf_load_defaults();
 417
 418         /* Free potential existing configuration.  */
 419         if (conf_addr) {
 420                 for (i = 0; i < sizeof conf_bindings / sizeof conf_bindings[0]; i++) {
 421                         cb = LIST_FIRST (&conf_bindings[i]);
 422                         for (; cb; cb = LIST_FIRST (&conf_bindings[i]))
 423                                 conf_remove_now(cb->section, cb->tag);
 424                 }
 425                 free (conf_addr);
 426         }
 427
 428         conf_end(trans, 1);
 429         conf_addr = new_conf_addr;
 430         return;
 431
 432 fail:
 433         if (new_conf_addr)
 434                 free(new_conf_addr);
 435         close (fd);
 436 }
 437
 438 /*
 439  * Return the numeric value denoted by TAG in section SECTION or DEF
 440  * if that tag does not exist.
 441  */
 442 int
 443 conf_get_num(char *section, char *tag, int def)
 444 {
 445         char *value = conf_get_str(section, tag);
 446
 447         if (value)
 448                 return atoi(value);
 449
 450         return def;
 451 }
 452
 453 /* Validate X according to the range denoted by TAG in section SECTION.  */
 454 int
 455 conf_match_num(char *section, char *tag, int x)
 456 {
 457         char *value = conf_get_str (section, tag);
 458         int val, min, max, n;
 459
 460         if (!value)
 461                 return 0;
 462         n = sscanf (value, "%d,%d:%d", &val, &min, &max);
 463         switch (n) {
 464         case 1:
 465                 xlog(LOG_INFO, "conf_match_num: %s:%s %d==%d?", section, tag, val, x);
 466                 return x == val;
 467         case 3:
 468                 xlog(LOG_INFO, "conf_match_num: %s:%s %d<=%d<=%d?", section,
 469                         tag, min, x, max);
 470                 return min <= x && max >= x;
 471         default:
 472                 xlog(LOG_INFO, "conf_match_num: section %s tag %s: invalid number spec %s",
 473                         section, tag, value);
 474         }
 475         return 0;
 476 }
 477
 478 /* Return the string value denoted by TAG in section SECTION.  */
 479 char *
 480 conf_get_str(char *section, char *tag)
 481 {
 482         struct conf_binding *cb;
 483
 484         cb = LIST_FIRST (&conf_bindings[conf_hash (section)]);
 485         for (; cb; cb = LIST_NEXT (cb, link)) {
 486                 if (strcasecmp (section, cb->section) == 0
 487                                 && strcasecmp (tag, cb->tag) == 0)
 488                         return cb->value;
 489         }
 490         return 0;
 491 }
 492 /*
 493  * Find a section that may or may not have an argument
 494  */
 495 char *
 496 conf_get_section(char *section, char *arg, char *tag)
 497 {
 498         struct conf_binding *cb;
 499
 500         cb = LIST_FIRST (&conf_bindings[conf_hash (section)]);
 501         for (; cb; cb = LIST_NEXT (cb, link)) {
 502                 if (strcasecmp(section, cb->section) != 0)
 503                         continue;
 504                 if (arg && strcasecmp(arg, cb->arg) != 0)
 505                         continue;
 506                 if (strcasecmp(tag, cb->tag) != 0)
 507                         continue;
 508                 return cb->value;
 509         }
 510         return 0;
 511 }
 512
 513 /*
 514  * Build a list of string values out of the comma separated value denoted by
 515  * TAG in SECTION.
 516  */
 517 struct conf_list *
 518 conf_get_list(char *section, char *tag)
 519 {
 520         char *liststr = 0, *p, *field, *t;
 521         struct conf_list *list = 0;
 522         struct conf_list_node *node;
 523
 524         list = malloc (sizeof *list);
 525         if (!list)
 526                 goto cleanup;
 527         TAILQ_INIT (&list->fields);
 528         list->cnt = 0;
 529         liststr = conf_get_str(section, tag);
 530         if (!liststr)
 531                 goto cleanup;
 532         liststr = strdup (liststr);
 533         if (!liststr)
 534                 goto cleanup;
 535         p = liststr;
 536         while ((field = strsep (&p, ",")) != NULL) {
 537                 /* Skip leading whitespace */
 538                 while (isspace (*field))
 539                         field++;
 540                 /* Skip trailing whitespace */
 541                 if (p) {
 542                         for (t = p - 1; t > field && isspace (*t); t--)
 543                                 *t = '\0';
 544                 }
 545                 if (*field == '\0') {
 546                         xlog(LOG_INFO, "conf_get_list: empty field, ignoring...");
 547                         continue;
 548                 }
 549                 list->cnt++;
 550                 node = calloc (1, sizeof *node);
 551                 if (!node)
 552                         goto cleanup;
 553                 node->field = strdup (field);
 554                 if (!node->field) {
 555                         free(node);
 556                         goto cleanup;
 557                 }
 558                 TAILQ_INSERT_TAIL (&list->fields, node, link);
 559         }
 560         free (liststr);
 561         return list;
 562
 563 cleanup:
 564         if (list)
 565                 conf_free_list(list);
 566         if (liststr)
 567                 free(liststr);
 568         return 0;
 569 }
 570
 571 struct conf_list *
 572 conf_get_tag_list(char *section)
 573 {
 574         struct conf_list *list = 0;
 575         struct conf_list_node *node;
 576         struct conf_binding *cb;
 577
 578         list = malloc(sizeof *list);
 579         if (!list)
 580                 goto cleanup;
 581         TAILQ_INIT(&list->fields);
 582         list->cnt = 0;
 583         cb = LIST_FIRST(&conf_bindings[conf_hash (section)]);
 584         for (; cb; cb = LIST_NEXT(cb, link)) {
 585                 if (strcasecmp (section, cb->section) == 0) {
 586                         list->cnt++;
 587                         node = calloc(1, sizeof *node);
 588                         if (!node)
 589                                 goto cleanup;
 590                         node->field = strdup(cb->tag);
 591                         if (!node->field) {
 592                                 free(node);
 593                                 goto cleanup;
 594                         }
 595                         TAILQ_INSERT_TAIL(&list->fields, node, link);
 596                 }
 597         }
 598         return list;
 599
 600 cleanup:
 601         if (list)
 602                 conf_free_list(list);
 603         return 0;
 604 }
 605
 606 /* Decode a PEM encoded buffer.  */
 607 int
 608 conf_decode_base64 (u_int8_t *out, u_int32_t *len, u_char *buf)
 609 {
 610         u_int32_t c = 0;
 611         u_int8_t c1, c2, c3, c4;
 612
 613         while (*buf) {
 614                 if (*buf > 127 || (c1 = asc2bin[*buf]) == 255)
 615                         return 0;
 616
 617                 buf++;
 618                 if (*buf > 127 || (c2 = asc2bin[*buf]) == 255)
 619                         return 0;
 620
 621                 buf++;
 622                 if (*buf == '=') {
 623                         c3 = c4 = 0;
 624                         c++;
 625
 626                         /* Check last four bit */
 627                         if (c2 & 0xF)
 628                                 return 0;
 629
 630                         if (strcmp((char *)buf, "==") == 0)
 631                                 buf++;
 632                         else
 633                                 return 0;
 634                 } else if (*buf > 127 || (c3 = asc2bin[*buf]) == 255)
 635                         return 0;
 636                 else {
 637                         if (*++buf == '=') {
 638                                 c4 = 0;
 639                                 c += 2;
 640
 641                                 /* Check last two bit */
 642                                 if (c3 & 3)
 643                                         return 0;
 644
 645                         if (strcmp((char *)buf, "="))
 646                                 return 0;
 647                         } else if (*buf > 127 || (c4 = asc2bin[*buf]) == 255)
 648                                 return 0;
 649                         else
 650                                 c += 3;
 651                 }
 652
 653                 buf++;
 654                 *out++ = (c1 << 2) | (c2 >> 4);
 655                 *out++ = (c2 << 4) | (c3 >> 2);
 656                 *out++ = (c3 << 6) | c4;
 657         }
 658
 659         *len = c;
 660         return 1;
 661 }
 662
 663 void
 664 conf_free_list(struct conf_list *list)
 665 {
 666         struct conf_list_node *node = TAILQ_FIRST(&list->fields);
 667
 668         while (node) {
 669                 TAILQ_REMOVE(&list->fields, node, link);
 670                 if (node->field)
 671                         free(node->field);
 672                 free (node);
 673                 node = TAILQ_FIRST(&list->fields);
 674         }
 675         free (list);
 676 }
 677
 678 int
 679 conf_begin(void)
 680 {
 681   static int seq = 0;
 682
 683   return ++seq;
 684 }
 685
 686 static struct conf_trans *
 687 conf_trans_node(int transaction, enum conf_op op)
 688 {
 689         struct conf_trans *node;
 690
 691         node = calloc (1, sizeof *node);
 692         if (!node) {
 693                 xlog_warn("conf_trans_node: calloc (1, %lu) failed",
 694                 (unsigned long)sizeof *node);
 695                 return 0;
 696         }
 697         node->trans = transaction;
 698         node->op = op;
 699         TAILQ_INSERT_TAIL (&conf_trans_queue, node, link);
 700         return node;
 701 }
 702
 703 /* Queue a set operation.  */
 704 static int
 705 conf_set(int transaction, char *section, char *arg,
 706         char *tag, char *value, int override, int is_default)
 707 {
 708         struct conf_trans *node;
 709
 710         node = conf_trans_node(transaction, CONF_SET);
 711         if (!node)
 712                 return 1;
 713         node->section = strdup(section);
 714         if (!node->section) {
 715                 xlog_warn("conf_set: strdup(\"%s\") failed", section);
 716                 goto fail;
 717         }
 718         /* Make Section names case-insensitive */
 719         upper2lower(node->section);
 720
 721         if (arg) {
 722                 node->arg = strdup(arg);
 723                 if (!node->arg) {
 724                         xlog_warn("conf_set: strdup(\"%s\") failed", arg);
 725                         goto fail;
 726                 }
 727         } else
 728                 node->arg = NULL;
 729
 730         node->tag = strdup(tag);
 731         if (!node->tag) {
 732                 xlog_warn("conf_set: strdup(\"%s\") failed", tag);
 733                 goto fail;
 734         }
 735         node->value = strdup(value);
 736         if (!node->value) {
 737                 xlog_warn("conf_set: strdup(\"%s\") failed", value);
 738                 goto fail;
 739         }
 740         node->override = override;
 741         node->is_default = is_default;
 742         return 0;
 743
 744 fail:
 745         if (node->tag)
 746                 free(node->tag);
 747         if (node->section)
 748                 free(node->section);
 749         if (node)
 750                 free(node);
 751         return 1;
 752 }
 753
 754 /* Queue a remove operation.  */
 755 int
 756 conf_remove(int transaction, char *section, char *tag)
 757 {
 758         struct conf_trans *node;
 759
 760         node = conf_trans_node(transaction, CONF_REMOVE);
 761         if (!node)
 762                 goto fail;
 763         node->section = strdup(section);
 764         if (!node->section) {
 765                 xlog_warn("conf_remove: strdup(\"%s\") failed", section);
 766                 goto fail;
 767         }
 768         node->tag = strdup(tag);
 769         if (!node->tag) {
 770                 xlog_warn("conf_remove: strdup(\"%s\") failed", tag);
 771                 goto fail;
 772         }
 773         return 0;
 774
 775 fail:
 776         if (node && node->section)
 777                 free (node->section);
 778         if (node)
 779                 free (node);
 780         return 1;
 781 }
 782
 783 /* Queue a remove section operation.  */
 784 int
 785 conf_remove_section(int transaction, char *section)
 786 {
 787         struct conf_trans *node;
 788
 789         node = conf_trans_node(transaction, CONF_REMOVE_SECTION);
 790         if (!node)
 791                 goto fail;
 792         node->section = strdup(section);
 793         if (!node->section) {
 794                 xlog_warn("conf_remove_section: strdup(\"%s\") failed", section);
 795                 goto fail;
 796         }
 797         return 0;
 798
 799 fail:
 800         if (node)
 801                 free(node);
 802         return 1;
 803 }
 804
 805 /* Execute all queued operations for this transaction.  Cleanup.  */
 806 int
 807 conf_end(int transaction, int commit)
 808 {
 809         struct conf_trans *node, *next;
 810
 811         for (node = TAILQ_FIRST(&conf_trans_queue); node; node = next) {
 812                 next = TAILQ_NEXT(node, link);
 813                 if (node->trans == transaction) {
 814                         if (commit) {
 815                                 switch (node->op) {
 816                                 case CONF_SET:
 817                                         conf_set_now(node->section, node->arg,
 818                                                 node->tag, node->value, node->override,
 819                                                 node->is_default);
 820                                         break;
 821                                 case CONF_REMOVE:
 822                                         conf_remove_now(node->section, node->tag);
 823                                         break;
 824                                 case CONF_REMOVE_SECTION:
 825                                         conf_remove_section_now(node->section);
 826                                         break;
 827                                 default:
 828                                         xlog(LOG_INFO, "conf_end: unknown operation: %d", node->op);
 829                                 }
 830                         }
 831                         TAILQ_REMOVE (&conf_trans_queue, node, link);
 832                         if (node->section)
 833                                 free(node->section);
 834                         if (node->tag)
 835                                 free(node->tag);
 836                         if (node->value)
 837                                 free(node->value);
 838                         free (node);
 839                 }
 840         }
 841         return 0;
 842 }
 843
 844 /*
 845  * Dump running configuration upon SIGUSR1.
 846  * Configuration is "stored in reverse order", so reverse it again.
 847  */
 848 struct dumper {
 849         char *s, *v;
 850         struct dumper *next;
 851 };
 852
 853 static void
 854 conf_report_dump(struct dumper *node)
 855 {
 856         /* Recursive, cleanup when we're done.  */
 857         if (node->next)
 858                 conf_report_dump(node->next);
 859
 860         if (node->v)
 861                 xlog(LOG_INFO, "%s=\t%s", node->s, node->v);
 862         else if (node->s) {
 863                 xlog(LOG_INFO, "%s", node->s);
 864                 if (strlen(node->s) > 0)
 865                         free(node->s);
 866         }
 867
 868         free (node);
 869 }
 870
 871 void
 872 conf_report (void)
 873 {
 874         struct conf_binding *cb, *last = 0;
 875         unsigned int i, len, diff_arg = 0;
 876         char *current_section = (char *)0;
 877         char *current_arg = (char *)0;
 878         struct dumper *dumper, *dnode;
 879
 880         dumper = dnode = (struct dumper *)calloc(1, sizeof *dumper);
 881         if (!dumper)
 882                 goto mem_fail;
 883
 884         xlog(LOG_INFO, "conf_report: dumping running configuration");
 885
 886         for (i = 0; i < sizeof conf_bindings / sizeof conf_bindings[0]; i++)
 887                 for (cb = LIST_FIRST(&conf_bindings[i]); cb; cb = LIST_NEXT(cb, link)) {
 888                         if (!cb->is_default) {
 889                                 /* Make sure the Section arugment is the same */
 890                                 if (current_arg && current_section && cb->arg) {
 891                                         if (strcmp(cb->section, current_section) == 0 &&
 892                                                 strcmp(cb->arg, current_arg) != 0)
 893                                         diff_arg = 1;
 894                                 }
 895                                 /* Dump this entry.  */
 896                                 if (!current_section || strcmp(cb->section, current_section)
 897                                                         || diff_arg) {
 898                                         if (current_section || diff_arg) {
 899                                                 len = strlen (current_section) + 3;
 900                                                 if (current_arg)
 901                                                         len += strlen(current_arg) + 3;
 902                                                 dnode->s = malloc(len);
 903                                                 if (!dnode->s)
 904                                                         goto mem_fail;
 905
 906                                                 if (current_arg)
 907                                                         snprintf(dnode->s, len, "[%s \"%s\"]",
 908                                                                 current_section, current_arg);
 909                                                 else
 910                                                         snprintf(dnode->s, len, "[%s]", current_section);
 911
 912                                                 dnode->next =
 913                                                         (struct dumper *)calloc(1, sizeof (struct dumper));
 914                                                 dnode = dnode->next;
 915                                                 if (!dnode)
 916                                                         goto mem_fail;
 917
 918                                                 dnode->s = "";
 919                                                 dnode->next =
 920                                                         (struct dumper *)calloc(1, sizeof (struct dumper));
 921                                                 dnode = dnode->next;
 922                                                 if (!dnode)
 923                                                 goto mem_fail;
 924                                         }
 925                                         current_section = cb->section;
 926                                         current_arg = cb->arg;
 927                                         diff_arg = 0;
 928                                 }
 929                                 dnode->s = cb->tag;
 930                                 dnode->v = cb->value;
 931                                 dnode->next = (struct dumper *)calloc (1, sizeof (struct dumper));
 932                                 dnode = dnode->next;
 933                                 if (!dnode)
 934                                         goto mem_fail;
 935                                 last = cb;
 936                 }
 937         }
 938
 939         if (last) {
 940                 len = strlen(last->section) + 3;
 941                 if (last->arg)
 942                         len += strlen(last->arg) + 3;
 943                 dnode->s = malloc(len);
 944                 if (!dnode->s)
 945                         goto mem_fail;
 946                 if (last->arg)
 947                         snprintf(dnode->s, len, "[%s \"%s\"]", last->section, last->arg);
 948                 else
 949                         snprintf(dnode->s, len, "[%s]", last->section);
 950         }
 951         conf_report_dump(dumper);
 952         return;
 953
 954 mem_fail:
 955         xlog_warn("conf_report: malloc/calloc failed");
 956         while ((dnode = dumper) != 0) {
 957                 dumper = dumper->next;
 958                 if (dnode->s)
 959                         free(dnode->s);
 960                 free(dnode);
 961         }
 962         return;
 963 }