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