src/main/conffile.c

   1 /*
   2  * conffile.c   Read the radiusd.conf file.
   3  *
   4  *              Yep I should learn to use lex & yacc, or at least
   5  *              write a decent parser. I know how to do that, really :)
   6  *              miquels@cistron.nl
   7  *
   8  * Version:     $Id$
   9  *
  10  *   This program is free software; you can redistribute it and/or modify
  11  *   it under the terms of the GNU General Public License as published by
  12  *   the Free Software Foundation; either version 2 of the License, or
  13  *   (at your option) any later version.
  14  *
  15  *   This program is distributed in the hope that it will be useful,
  16  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *   GNU General Public License for more details.
  19  *
  20  *   You should have received a copy of the GNU General Public License
  21  *   along with this program; if not, write to the Free Software
  22  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  *
  24  * Copyright 2000  The FreeRADIUS server project
  25  * Copyright 2000  Miquel van Smoorenburg <miquels@cistron.nl>
  26  * Copyright 2000  Alan DeKok <aland@ox.org>
  27  */
  28
  29 #include "autoconf.h"
  30 #include "libradius.h"
  31
  32 #include <stdlib.h>
  33 #include <string.h>
  34
  35 #ifdef HAVE_NETINET_IN_H
  36 #       include <netinet/in.h>
  37 #endif
  38
  39 #ifdef HAVE_DIRENT_H
  40 #include <dirent.h>
  41 #endif
  42
  43 #include "radiusd.h"
  44 #include "rad_assert.h"
  45 #include "conffile.h"
  46 #include "token.h"
  47 #include "modules.h"
  48
  49 static const char rcsid[] =
  50 "$Id$";
  51
  52 #define xstrdup strdup
  53
  54 typedef enum conf_type {
  55         CONF_ITEM_PAIR,
  56         CONF_ITEM_SECTION
  57 } CONF_ITEM_TYPE;
  58
  59 struct conf_item {
  60         struct conf_item *next;
  61         struct conf_part *parent;
  62         int lineno;
  63         CONF_ITEM_TYPE type;
  64 };
  65 struct conf_pair {
  66         CONF_ITEM item;
  67         char *attr;
  68         char *value;
  69         LRAD_TOKEN operator;
  70 };
  71 struct conf_part {
  72         CONF_ITEM item;
  73         char *name1;
  74         char *name2;
  75         struct conf_item *children;
  76 };
  77
  78 /*
  79  *      Isolate the scary casts in these tiny provably-safe functions
  80  */
  81 CONF_PAIR *cf_itemtopair(CONF_ITEM *ci)
  82 {
  83         if (ci == NULL)
  84                 return NULL;
  85         rad_assert(ci->type == CONF_ITEM_PAIR);
  86         return (CONF_PAIR *)ci;
  87 }
  88 CONF_SECTION *cf_itemtosection(CONF_ITEM *ci)
  89 {
  90         if (ci == NULL)
  91                 return NULL;
  92         rad_assert(ci->type == CONF_ITEM_SECTION);
  93         return (CONF_SECTION *)ci;
  94 }
  95 CONF_ITEM *cf_pairtoitem(CONF_PAIR *cp)
  96 {
  97         if (cp == NULL)
  98                 return NULL;
  99         return (CONF_ITEM *)cp;
 100 }
 101 CONF_ITEM *cf_sectiontoitem(CONF_SECTION *cs)
 102 {
 103         if (cs == NULL)
 104                 return NULL;
 105         return (CONF_ITEM *)cs;
 106 }
 107
 108 /*
 109  *      Create a new CONF_PAIR
 110  */
 111 static CONF_PAIR *cf_pair_alloc(const char *attr, const char *value,
 112                 LRAD_TOKEN operator, CONF_SECTION *parent)
 113 {
 114         CONF_PAIR *cp;
 115
 116         cp = (CONF_PAIR *)rad_malloc(sizeof(CONF_PAIR));
 117         memset(cp, 0, sizeof(CONF_PAIR));
 118         cp->item.type = CONF_ITEM_PAIR;
 119         cp->item.parent = parent;
 120         cp->attr = xstrdup(attr);
 121         cp->value = xstrdup(value);
 122         cp->operator = operator;
 123
 124         return cp;
 125 }
 126
 127 /*
 128  *      Free a CONF_PAIR
 129  */
 130 void cf_pair_free(CONF_PAIR **cp)
 131 {
 132         if (!cp || !*cp) return;
 133
 134         if ((*cp)->attr)
 135                 free((*cp)->attr);
 136         if ((*cp)->value)
 137                 free((*cp)->value);
 138
 139 #ifndef NDEBUG
 140         memset(*cp, 0, sizeof(*cp));
 141 #endif
 142         free(*cp);
 143
 144         *cp = NULL;
 145 }
 146
 147 /*
 148  *      Allocate a CONF_SECTION
 149  */
 150 static CONF_SECTION *cf_section_alloc(const char *name1, const char *name2,
 151                 CONF_SECTION *parent)
 152 {
 153         CONF_SECTION    *cs;
 154
 155         if (name1 == NULL || !name1[0])
 156                 name1 = "main";
 157
 158         cs = (CONF_SECTION *)rad_malloc(sizeof(CONF_SECTION));
 159         memset(cs, 0, sizeof(CONF_SECTION));
 160         cs->item.type = CONF_ITEM_SECTION;
 161         cs->item.parent = parent;
 162         cs->name1 = strdup(name1);
 163         cs->name2 = (name2 && *name2) ? xstrdup(name2) : NULL;
 164
 165         return cs;
 166 }
 167
 168 /*
 169  *      Free a CONF_SECTION
 170  */
 171 void cf_section_free(CONF_SECTION **cs)
 172 {
 173         CONF_ITEM       *ci, *next;
 174
 175         if (!cs || !*cs) return;
 176
 177         for (ci = (*cs)->children; ci; ci = next) {
 178                 next = ci->next;
 179                 if (ci->type==CONF_ITEM_PAIR) {
 180                         CONF_PAIR *pair = cf_itemtopair(ci);
 181                         cf_pair_free(&pair);
 182                 } else {
 183                         CONF_SECTION *section = cf_itemtosection(ci);
 184                         cf_section_free(&section);
 185                 }
 186         }
 187
 188         if ((*cs)->name1)
 189                 free((*cs)->name1);
 190         if ((*cs)->name2)
 191                 free((*cs)->name2);
 192
 193         /*
 194          * And free the section
 195          */
 196 #ifndef NDEBUG
 197         memset(*cs, 0, sizeof(*cs));
 198 #endif
 199         free(*cs);
 200
 201         *cs = NULL;
 202 }
 203
 204 /*
 205  *      Add an item to a configuration section.
 206  */
 207 static void cf_item_add(CONF_SECTION *cs, CONF_ITEM *ci_new)
 208 {
 209         CONF_ITEM *ci;
 210
 211         for (ci = cs->children; ci && ci->next; ci = ci->next)
 212                 ;
 213
 214         if (ci == NULL)
 215                 cs->children = ci_new;
 216         else
 217                 ci->next = ci_new;
 218 }
 219
 220 /*
 221  *      Expand the variables in an input string.
 222  */
 223 static const char *cf_expand_variables(const char *cf, int *lineno,
 224                                        CONF_SECTION *outercs,
 225                                        char *output, const char *input)
 226 {
 227         char *p;
 228         const char *end, *ptr;
 229         char name[8192];
 230         CONF_SECTION *parentcs;
 231
 232         /*
 233          *      Find the master parent conf section.
 234          *      We can't use mainconfig.config, because we're in the
 235          *      process of re-building it, and it isn't set up yet...
 236          */
 237         for (parentcs = outercs;
 238              parentcs->item.parent != NULL;
 239              parentcs = parentcs->item.parent) {
 240                 /* do nothing */
 241         }
 242
 243         p = output;
 244         ptr = input;
 245         while (*ptr) {
 246                 /*
 247                  *      Ignore anything other than "${"
 248                  */
 249                 if ((*ptr == '$') && (ptr[1] == '{')) {
 250                         int up;
 251                         CONF_PAIR *cp;
 252                         CONF_SECTION *cs;
 253
 254                         /*
 255                          *      FIXME: Add support for ${foo:-bar},
 256                          *      like in xlat.c
 257                          */
 258
 259                         /*
 260                          *      Look for trailing '}', and log a
 261                          *      warning for anything that doesn't match,
 262                          *      and exit with a fatal error.
 263                          */
 264                         end = strchr(ptr, '}');
 265                         if (end == NULL) {
 266                                 *p = '\0';
 267                                 radlog(L_INFO, "%s[%d]: Variable expansion missing }",
 268                                        cf, *lineno);
 269                                 return NULL;
 270                         }
 271
 272                         ptr += 2;
 273
 274                         cp = NULL;
 275                         up = 0;
 276
 277                         /*
 278                          *      ${.foo} means "foo from the current section"
 279                          */
 280                         if (*ptr == '.') {
 281                                 up = 1;
 282                                 cs = outercs;
 283                                 ptr++;
 284
 285                                 /*
 286                                  *      ${..foo} means "foo from the section
 287                                  *      enclosing this section" (etc.)
 288                                  */
 289                                 while (*ptr == '.') {
 290                                         if (cs->item.parent)
 291                                                 cs = cs->item.parent;
 292                                         ptr++;
 293                                 }
 294
 295                         } else {
 296                                 const char *q;
 297                                 /*
 298                                  *      ${foo} is local, with
 299                                  *      main as lower priority
 300                                  */
 301                                 cs = outercs;
 302
 303                                 /*
 304                                  *      ${foo.bar.baz} is always rooted
 305                                  *      from the top.
 306                                  */
 307                                 for (q = ptr; *q && q != end; q++) {
 308                                         if (*q == '.') {
 309                                                 cs = parentcs;
 310                                                 up = 1;
 311                                                 break;
 312                                         }
 313                                 }
 314                         }
 315
 316                         while (cp == NULL) {
 317                                 char *q;
 318                                 /*
 319                                  *      Find the next section.
 320                                  */
 321                                 for (q = name;
 322                                      (*ptr != 0) && (*ptr != '.') &&
 323                                              (ptr != end);
 324                                      q++, ptr++) {
 325                                         *q = *ptr;
 326                                 }
 327                                 *q = '\0';
 328
 329                                 /*
 330                                  *      The character is a '.', find a
 331                                  *      section (as the user has given
 332                                  *      us a subsection to find)
 333                                  */
 334                                 if (*ptr == '.') {
 335                                         CONF_SECTION *next;
 336
 337                                         ptr++;  /* skip the period */
 338
 339                                         /*
 340                                          *      Find the sub-section.
 341                                          */
 342                                         next = cf_section_sub_find(cs, name);
 343                                         if (next == NULL) {
 344                                                 radlog(L_ERR, "config: No such section %s in variable %s", name, input);
 345                                                 return NULL;
 346                                         }
 347                                         cs = next;
 348
 349                                 } else { /* no period, must be a conf-part */
 350                                         /*
 351                                          *      Find in the current referenced
 352                                          *      section.
 353                                          */
 354                                         cp = cf_pair_find(cs, name);
 355                                         if (cp == NULL) {
 356                                                 /*
 357                                                  *      It it was NOT ${..foo}
 358                                                  *      then look in the
 359                                                  *      top-level config items.
 360                                                  */
 361                                                 if (!up) cp = cf_pair_find(parentcs, name);
 362                                         }
 363                                         if (cp == NULL) {
 364                                                 radlog(L_ERR, "config: No such entry %s for string %s", name, input);
 365                                                 return NULL;
 366                                         }
 367                                 }
 368                         } /* until cp is non-NULL */
 369
 370                         /*
 371                          *  Substitute the value of the variable.
 372                          */
 373                         strcpy(p, cp->value);
 374                         p += strlen(p);
 375                         ptr = end + 1;
 376
 377                 } else if (memcmp(ptr, "$ENV{", 5) == 0) {
 378                         char *env;
 379
 380                         ptr += 5;
 381
 382                         /*
 383                          *      Look for trailing '}', and log a
 384                          *      warning for anything that doesn't match,
 385                          *      and exit with a fatal error.
 386                          */
 387                         end = strchr(ptr, '}');
 388                         if (end == NULL) {
 389                                 *p = '\0';
 390                                 radlog(L_INFO, "%s[%d]: Environment variable expansion missing }",
 391                                        cf, *lineno);
 392                                 return NULL;
 393                         }
 394
 395                         memcpy(name, ptr, end - ptr);
 396                         name[end - ptr] = '\0';
 397
 398                         /*
 399                          *      Get the environment variable.
 400                          *      If none exists, then make it an empty string.
 401                          */
 402                         env = getenv(name);
 403                         if (env == NULL) {
 404                                 *name = '\0';
 405                                 env = name;
 406                         }
 407
 408                         strcpy(p, env);
 409                         p += strlen(p);
 410                         ptr = end + 1;
 411
 412                 } else {
 413                         /*
 414                          *      Copy it over verbatim.
 415                          */
 416                         *(p++) = *(ptr++);
 417                 }
 418         } /* loop over all of the input string. */
 419
 420         *p = '\0';
 421
 422         return output;
 423 }
 424
 425 /*
 426  *      Parse a configuration section into user-supplied variables.
 427  */
 428 int cf_section_parse(CONF_SECTION *cs, void *base,
 429                      const CONF_PARSER *variables)
 430 {
 431         int i;
 432         int rcode;
 433         char **q;
 434         CONF_PAIR *cp;
 435         CONF_SECTION *subsection;
 436         uint32_t ipaddr;
 437         char buffer[8192];
 438         const char *value;
 439         void *data;
 440
 441         /*
 442          *      Handle the user-supplied variables.
 443          */
 444         for (i = 0; variables[i].name != NULL; i++) {
 445                 value = variables[i].dflt;
 446                 if (variables[i].data) {
 447                         data = variables[i].data; /* prefer this. */
 448                 } else if (base) {
 449                         data = ((char *)base) + variables[i].offset;
 450                 } else {
 451                         data = variables[i].data;
 452                 }
 453
 454                 cp = cf_pair_find(cs, variables[i].name);
 455                 if (cp) {
 456                         value = cp->value;
 457                 }
 458
 459                 switch (variables[i].type)
 460                 {
 461                 case PW_TYPE_SUBSECTION:
 462                         subsection = cf_section_sub_find(cs,variables[i].name);
 463
 464                         /*
 465                          *      If the configuration section is NOT there,
 466                          *      then ignore it.
 467                          *
 468                          *      FIXME! This is probably wrong... we should
 469                          *      probably set the items to their default values.
 470                          */
 471                         if (subsection == NULL) {
 472                                 break;
 473                         }
 474
 475                         rcode = cf_section_parse(subsection, base,
 476                                         (CONF_PARSER *) data);
 477                         if (rcode < 0) {
 478                                 return -1;
 479                         }
 480                         break;
 481
 482                 case PW_TYPE_BOOLEAN:
 483                         /*
 484                          *      Allow yes/no and on/off
 485                          */
 486                         if ((strcasecmp(value, "yes") == 0) ||
 487                                         (strcasecmp(value, "on") == 0)) {
 488                                 *(int *)data = 1;
 489                         } else if ((strcasecmp(value, "no") == 0) ||
 490                                                 (strcasecmp(value, "off") == 0)) {
 491                                 *(int *)data = 0;
 492                         } else {
 493                                 *(int *)data = 0;
 494                                 radlog(L_ERR, "Bad value \"%s\" for boolean variable %s", value, variables[i].name);
 495                                 return -1;
 496                         }
 497                         DEBUG2(" %s: %s = %s",
 498                                         cs->name1,
 499                                         variables[i].name,
 500                                         value);
 501                         break;
 502
 503                 case PW_TYPE_INTEGER:
 504                         *(int *)data = strtol(value, 0, 0);
 505                         DEBUG2(" %s: %s = %d",
 506                                         cs->name1,
 507                                         variables[i].name,
 508                                         *(int *)data);
 509                         break;
 510
 511                 case PW_TYPE_STRING_PTR:
 512                         q = (char **) data;
 513                         if (*q != NULL) {
 514                                 free(*q);
 515                         }
 516
 517                         /*
 518                          *      Expand variables while parsing,
 519                          *      but ONLY expand ones which haven't already
 520                          *      been expanded.
 521                          */
 522                         if (value && (value == variables[i].dflt)) {
 523                                 value = cf_expand_variables("?",
 524                                                             &cs->item.lineno,
 525                                                             cs, buffer, value);
 526                                 if (!value) {
 527                                         return -1;
 528                                 }
 529                         }
 530
 531                         DEBUG2(" %s: %s = \"%s\"",
 532                                         cs->name1,
 533                                         variables[i].name,
 534                                         value ? value : "(null)");
 535                         *q = value ? strdup(value) : NULL;
 536                         break;
 537
 538                 case PW_TYPE_IPADDR:
 539                         /*
 540                          *      Allow '*' as any address
 541                          */
 542                         if (strcmp(value, "*") == 0) {
 543                                 *(uint32_t *) data = 0;
 544                                 break;
 545                         }
 546                         ipaddr = ip_getaddr(value);
 547                         if (ipaddr == 0) {
 548                                 radlog(L_ERR, "Can't find IP address for host %s", value);
 549                                 return -1;
 550                         }
 551                         DEBUG2(" %s: %s = %s IP address [%s]",
 552                                         cs->name1,
 553                                         variables[i].name,
 554                                         value, ip_ntoa(buffer, ipaddr));
 555                         *(uint32_t *) data = ipaddr;
 556                         break;
 557
 558                 default:
 559                         radlog(L_ERR, "type %d not supported yet", variables[i].type);
 560                         return -1;
 561                         break;
 562                 } /* switch over variable type */
 563         } /* for all variables in the configuration section */
 564
 565         return 0;
 566 }
 567
 568 /*
 569  *      Used in a few places, so in one function for clarity.
 570  */
 571 static void cf_fixup_children(CONF_SECTION *cs, CONF_SECTION *is)
 572 {
 573         /*
 574          *      Add the included conf
 575          *      to our CONF_SECTION
 576          */
 577         if (is->children != NULL) {
 578                 CONF_ITEM *ci;
 579
 580                 /*
 581                  *      Re-write the parent of the
 582                  *      moved children to be the
 583                  *      upper-layer section.
 584                  */
 585                 for (ci = is->children; ci; ci = ci->next) {
 586                         ci->parent = cs;
 587                 }
 588
 589                 /*
 590                  *      If there are children, then
 591                  *      move them up a layer.
 592                  */
 593                 if (is->children) {
 594                         cf_item_add(cs, is->children);
 595                 }
 596                 is->children = NULL;
 597         }
 598         /*
 599          *      Always free the section for the
 600          *      $INCLUDEd file.
 601          */
 602         cf_section_free(&is);
 603 }
 604
 605
 606 /*
 607  *      Read a part of the config file.
 608  */
 609 static CONF_SECTION *cf_section_read(const char *cf, int *lineno, FILE *fp,
 610                                      const char *name1, const char *name2,
 611                                      CONF_SECTION *parent)
 612 {
 613         CONF_SECTION *cs, *css;
 614         CONF_PAIR *cpn;
 615         char *ptr;
 616         const char *value;
 617         char buf[8192];
 618         char buf1[8192];
 619         char buf2[8192];
 620         char buf3[8192];
 621         int t1, t2, t3;
 622         char *cbuf = buf;
 623         int len;
 624
 625         /*
 626          *      Ensure that the user can't add CONF_SECTIONs
 627          *      with 'internal' names;
 628          */
 629         if ((name1 != NULL) && (name1[0] == '_')) {
 630                 radlog(L_ERR, "%s[%d]: Illegal configuration section name",
 631                         cf, *lineno);
 632                 return NULL;
 633         }
 634
 635         /*
 636          *      Allocate new section.
 637          */
 638         cs = cf_section_alloc(name1, name2, parent);
 639         cs->item.lineno = *lineno;
 640
 641         /*
 642          *      Read, checking for line continuations ('\\' at EOL)
 643          */
 644         for (;;) {
 645                 int eof;
 646
 647                 /*
 648                  *      Get data, and remember if we are at EOF.
 649                  */
 650                 eof = (fgets(cbuf, sizeof(buf) - (cbuf - buf), fp) == NULL);
 651                 (*lineno)++;
 652
 653                 len = strlen(cbuf);
 654
 655                 /*
 656                  *      We've filled the buffer, and there isn't
 657                  *      a CR in it.  Die!
 658                  */
 659                 if ((len == sizeof(buf)) &&
 660                     (cbuf[len - 1] != '\n')) {
 661                         radlog(L_ERR, "%s[%d]: Line too long",
 662                                cf, *lineno);
 663                         cf_section_free(&cs);
 664                         return NULL;
 665                 }
 666
 667                 /*
 668                  *  Check for continuations.
 669                  */
 670                 if (cbuf[len - 1] == '\n') len--;
 671
 672                 /*
 673                  *      Last character is '\\'.  Over-write it,
 674                  *      and read another line.
 675                  */
 676                 if ((len > 0) && (cbuf[len - 1] == '\\')) {
 677                         cbuf[len - 1] = '\0';
 678                         cbuf += len - 1;
 679                         continue;
 680                 }
 681
 682                 /*
 683                  *  We're at EOF, and haven't read anything.  Stop.
 684                  */
 685                 if (eof && (cbuf == buf)) {
 686                         break;
 687                 }
 688
 689                 ptr = cbuf = buf;
 690                 t1 = gettoken(&ptr, buf1, sizeof(buf1));
 691
 692                 /*
 693                  *      Skip comments and blank lines immediately.
 694                  */
 695                 if ((*buf1 == '#') || (*buf1 == '\0')) {
 696                         continue;
 697                 }
 698
 699                 /*
 700                  *      Allow for $INCLUDE files
 701                  *
 702                  *      This *SHOULD* work for any level include.
 703                  *      I really really really hate this file.  -cparker
 704                  */
 705                 if (strcasecmp(buf1, "$INCLUDE") == 0) {
 706                         CONF_SECTION    *is;
 707
 708                         t2 = getword(&ptr, buf2, sizeof(buf2));
 709
 710                         value = cf_expand_variables(cf, lineno, cs, buf, buf2);
 711                         if (value == NULL) {
 712                                 cf_section_free(&cs);
 713                                 return NULL;
 714                         }
 715
 716 #ifdef HAVE_DIRENT_H
 717                         /*
 718                          *      $INCLUDE foo/
 719                          *
 720                          *      Include ALL non-"dot" files in the directory.
 721                          *      careful!
 722                          */
 723                         if (value[strlen(value) - 1] == '/') {
 724                                 DIR             *dir;
 725                                 struct dirent   *dp;
 726
 727                                 DEBUG2( "Config:   including files in directory: %s", value );
 728                                 dir = opendir(value);
 729                                 if (!dir) {
 730                                         radlog(L_ERR, "%s[%d]: Error reading directory %s: %s",
 731                                                cf, *lineno, value,
 732                                                strerror(errno));
 733                                         cf_section_free(&cs);
 734                                         return NULL;
 735                                 }
 736
 737                                 /*
 738                                  *      Read the directory, ignoring "." files.
 739                                  */
 740                                 while ((dp = readdir(dir)) != NULL) {
 741                                         if (dp->d_name[0] == '.') continue;
 742                                         if (strchr(dp->d_name, '~') != NULL) continue;
 743
 744                                         snprintf(buf2, sizeof(buf2), "%s%s",
 745                                                  value, dp->d_name);
 746                                         if ((is = conf_read(cf, *lineno, buf2, parent)) == NULL) {
 747                                                 closedir(dir);
 748                                                 cf_section_free(&cs);
 749                                                 return NULL;
 750                                         }
 751
 752                                         cf_fixup_children(cs, is);
 753                                 }
 754                                 closedir(dir);
 755                         }  else
 756 #endif
 757                         { /* it was a normal file */
 758                                 DEBUG2( "Config:   including file: %s", value );
 759                                 if ((is = conf_read(cf, *lineno, value, parent)) == NULL) {
 760                                         cf_section_free(&cs);
 761                                         return NULL;
 762                                 }
 763                                 cf_fixup_children(cs, is);
 764                         }
 765                         continue;
 766                 } /* we were in an include */
 767
 768                 /*
 769                  *      No '=': must be a section or sub-section.
 770                  */
 771                 if (strchr(ptr, '=') == NULL) {
 772                         t2 = gettoken(&ptr, buf2, sizeof(buf2));
 773                         t3 = gettoken(&ptr, buf3, sizeof(buf3));
 774                 } else {
 775                         t2 = gettoken(&ptr, buf2, sizeof(buf2));
 776                         t3 = getword(&ptr, buf3, sizeof(buf3));
 777                 }
 778
 779                 /*
 780                  *      See if it's the end of a section.
 781                  */
 782                 if (t1 == T_RCBRACE) {
 783                         if (name1 == NULL || buf2[0]) {
 784                                 radlog(L_ERR, "%s[%d]: Unexpected end of section",
 785                                                 cf, *lineno);
 786                                 cf_section_free(&cs);
 787                                 return NULL;
 788                         }
 789                         return cs;
 790                 }
 791
 792                 /*
 793                  * Perhaps a subsection.
 794                  */
 795                 if (t2 == T_LCBRACE || t3 == T_LCBRACE) {
 796                         css = cf_section_read(cf, lineno, fp, buf1,
 797                                               t2==T_LCBRACE ? NULL : buf2, cs);
 798                         if (css == NULL) {
 799                                 cf_section_free(&cs);
 800                                 return NULL;
 801                         }
 802                         cf_item_add(cs, cf_sectiontoitem(css));
 803
 804                         continue;
 805                 }
 806
 807                 /*
 808                  *      Ignore semi-colons.
 809                  */
 810                 if (*buf2 == ';')
 811                         *buf2 = '\0';
 812
 813                 /*
 814                  *      Must be a normal attr = value line.
 815                  */
 816                 if (buf1[0] != 0 && buf2[0] == 0 && buf3[0] == 0) {
 817                         t2 = T_OP_EQ;
 818                 } else if (buf1[0] == 0 || buf2[0] == 0 ||
 819                            (t2 < T_EQSTART || t2 > T_EQEND)) {
 820                         radlog(L_ERR, "%s[%d]: Line is not in 'attribute = value' format",
 821                                         cf, *lineno);
 822                         cf_section_free(&cs);
 823                         return NULL;
 824                 }
 825
 826                 /*
 827                  *      Ensure that the user can't add CONF_PAIRs
 828                  *      with 'internal' names;
 829                  */
 830                 if (buf1[0] == '_') {
 831                         radlog(L_ERR, "%s[%d]: Illegal configuration pair name \"%s\"",
 832                                         cf, *lineno, buf1);
 833                         cf_section_free(&cs);
 834                         return NULL;
 835                 }
 836
 837                 /*
 838                  *      Handle variable substitution via ${foo}
 839                  */
 840                 value = cf_expand_variables(cf, lineno, cs, buf, buf3);
 841                 if (!value) {
 842                         cf_section_free(&cs);
 843                         return NULL;
 844                 }
 845
 846
 847                 /*
 848                  *      Add this CONF_PAIR to our CONF_SECTION
 849                  */
 850                 cpn = cf_pair_alloc(buf1, value, t2, parent);
 851                 cpn->item.lineno = *lineno;
 852                 cf_item_add(cs, cf_pairtoitem(cpn));
 853         }
 854
 855         /*
 856          *      See if EOF was unexpected ..
 857          */
 858         if (name1 != NULL) {
 859                 radlog(L_ERR, "%s[%d]: Unexpected end of file", cf, *lineno);
 860                 cf_section_free(&cs);
 861                 return NULL;
 862         }
 863
 864         return cs;
 865 }
 866
 867 /*
 868  *      Read the config file.
 869  */
 870 CONF_SECTION *conf_read(const char *fromfile, int fromline,
 871                         const char *conffile, CONF_SECTION *parent)
 872 {
 873         FILE            *fp;
 874         int             lineno = 0;
 875         CONF_SECTION    *cs;
 876
 877         if ((fp = fopen(conffile, "r")) == NULL) {
 878                 if (fromfile) {
 879                         radlog(L_ERR|L_CONS, "%s[%d]: Unable to open file \"%s\": %s",
 880                                         fromfile, fromline, conffile, strerror(errno));
 881                 } else {
 882                         radlog(L_ERR|L_CONS, "Unable to open file \"%s\": %s",
 883                                         conffile, strerror(errno));
 884                 }
 885                 return NULL;
 886         }
 887
 888         cs = cf_section_read(conffile, &lineno, fp, NULL, NULL, parent);
 889
 890         fclose(fp);
 891
 892         return cs;
 893 }
 894
 895
 896 /*
 897  * Return a CONF_PAIR within a CONF_SECTION.
 898  */
 899 CONF_PAIR *cf_pair_find(CONF_SECTION *section, const char *name)
 900 {
 901         CONF_ITEM       *ci;
 902
 903         if (section == NULL) {
 904                 section = mainconfig.config;
 905         }
 906
 907         for (ci = section->children; ci; ci = ci->next) {
 908                 if (ci->type != CONF_ITEM_PAIR)
 909                         continue;
 910                 if (name == NULL || strcmp(cf_itemtopair(ci)->attr, name) == 0)
 911                         break;
 912         }
 913
 914         return cf_itemtopair(ci);
 915 }
 916
 917 /*
 918  * Return the attr of a CONF_PAIR
 919  */
 920
 921 char *cf_pair_attr(CONF_PAIR *pair)
 922 {
 923         return (pair ? pair->attr : NULL);
 924 }
 925
 926 /*
 927  * Return the value of a CONF_PAIR
 928  */
 929
 930 char *cf_pair_value(CONF_PAIR *pair)
 931 {
 932         return (pair ? pair->value : NULL);
 933 }
 934
 935 /*
 936  * Return the first label of a CONF_SECTION
 937  */
 938
 939 char *cf_section_name1(CONF_SECTION *section)
 940 {
 941         return (section ? section->name1 : NULL);
 942 }
 943
 944 /*
 945  * Return the second label of a CONF_SECTION
 946  */
 947
 948 char *cf_section_name2(CONF_SECTION *section)
 949 {
 950         return (section ? section->name2 : NULL);
 951 }
 952
 953 /*
 954  * Find a value in a CONF_SECTION
 955  */
 956 char *cf_section_value_find(CONF_SECTION *section, const char *attr)
 957 {
 958         CONF_PAIR       *cp;
 959
 960         cp = cf_pair_find(section, attr);
 961
 962         return (cp ? cp->value : NULL);
 963 }
 964
 965 /*
 966  * Return the next pair after a CONF_PAIR
 967  * with a certain name (char *attr) If the requested
 968  * attr is NULL, any attr matches.
 969  */
 970
 971 CONF_PAIR *cf_pair_find_next(CONF_SECTION *section, CONF_PAIR *pair, const char *attr)
 972 {
 973         CONF_ITEM       *ci;
 974
 975         /*
 976          * If pair is NULL this must be a first time run
 977          * Find the pair with correct name
 978          */
 979
 980         if (pair == NULL){
 981                 return cf_pair_find(section, attr);
 982         }
 983
 984         ci = cf_pairtoitem(pair)->next;
 985
 986         for (; ci; ci = ci->next) {
 987                 if (ci->type != CONF_ITEM_PAIR)
 988                         continue;
 989                 if (attr == NULL || strcmp(cf_itemtopair(ci)->attr, attr) == 0)
 990                         break;
 991         }
 992
 993         return cf_itemtopair(ci);
 994 }
 995
 996 /*
 997  * Find a CONF_SECTION, or return the root if name is NULL
 998  */
 999
1000 CONF_SECTION *cf_section_find(const char *name)
1001 {
1002         if (name)
1003                 return cf_section_sub_find(mainconfig.config, name);
1004         else
1005                 return mainconfig.config;
1006 }
1007
1008 /*
1009  * Find a sub-section in a section
1010  */
1011
1012 CONF_SECTION *cf_section_sub_find(CONF_SECTION *section, const char *name)
1013 {
1014         CONF_ITEM *ci;
1015
1016         for (ci = section->children; ci; ci = ci->next) {
1017                 if (ci->type != CONF_ITEM_SECTION)
1018                         continue;
1019                 if (strcmp(cf_itemtosection(ci)->name1, name) == 0)
1020                         break;
1021         }
1022
1023         return cf_itemtosection(ci);
1024
1025 }
1026
1027 /*
1028  * Return the next subsection after a CONF_SECTION
1029  * with a certain name1 (char *name1). If the requested
1030  * name1 is NULL, any name1 matches.
1031  */
1032
1033 CONF_SECTION *cf_subsection_find_next(CONF_SECTION *section,
1034                 CONF_SECTION *subsection,
1035                 const char *name1)
1036 {
1037         CONF_ITEM       *ci;
1038
1039         /*
1040          * If subsection is NULL this must be a first time run
1041          * Find the subsection with correct name
1042          */
1043
1044         if (subsection == NULL){
1045                 ci = section->children;
1046         } else {
1047                 ci = cf_sectiontoitem(subsection)->next;
1048         }
1049
1050         for (; ci; ci = ci->next) {
1051                 if (ci->type != CONF_ITEM_SECTION)
1052                         continue;
1053                 if ((name1 == NULL) ||
1054                                 (strcmp(cf_itemtosection(ci)->name1, name1) == 0))
1055                         break;
1056         }
1057
1058         return cf_itemtosection(ci);
1059 }
1060
1061 /*
1062  * Return the next item after a CONF_ITEM.
1063  */
1064
1065 CONF_ITEM *cf_item_find_next(CONF_SECTION *section, CONF_ITEM *item)
1066 {
1067         /*
1068          * If item is NULL this must be a first time run
1069          * Return the first item
1070          */
1071
1072         if (item == NULL) {
1073                 return section->children;
1074         } else {
1075                 return item->next;
1076         }
1077 }
1078
1079 int cf_section_lineno(CONF_SECTION *section)
1080 {
1081         return cf_sectiontoitem(section)->lineno;
1082 }
1083
1084 int cf_pair_lineno(CONF_PAIR *pair)
1085 {
1086         return cf_pairtoitem(pair)->lineno;
1087 }
1088
1089 int cf_item_is_section(CONF_ITEM *item)
1090 {
1091         return item->type == CONF_ITEM_SECTION;
1092 }
1093
1094
1095 #if 0
1096 /*
1097  * JMG dump_config tries to dump the config structure in a readable format
1098  *
1099 */
1100
1101 static int dump_config_section(CONF_SECTION *cs, int indent)
1102 {
1103         CONF_SECTION    *scs;
1104         CONF_PAIR       *cp;
1105         CONF_ITEM       *ci;
1106
1107         /* The DEBUG macro doesn't let me
1108          *   for(i=0;i<indent;++i) debugputchar('\t');
1109          * so I had to get creative. --Pac. */
1110
1111         for (ci = cs->children; ci; ci = ci->next) {
1112                 if (ci->type == CONF_ITEM_PAIR) {
1113                         cp=cf_itemtopair(ci);
1114                         DEBUG("%.*s%s = %s",
1115                                 indent, "\t\t\t\t\t\t\t\t\t\t\t",
1116                                 cp->attr, cp->value);
1117                 } else {
1118                         scs=cf_itemtosection(ci);
1119                         DEBUG("%.*s%s %s%s{",
1120                                 indent, "\t\t\t\t\t\t\t\t\t\t\t",
1121                                 scs->name1,
1122                                 scs->name2 ? scs->name2 : "",
1123                                 scs->name2 ?  " " : "");
1124                         dump_config_section(scs, indent+1);
1125                         DEBUG("%.*s}",
1126                                 indent, "\t\t\t\t\t\t\t\t\t\t\t");
1127                 }
1128         }
1129
1130         return 0;
1131 }
1132
1133 int dump_config(void)
1134 {
1135         return dump_config_section(mainconfig.config, 0);
1136 }
1137 #endif