src/main/evaluate.c

   1 /*
   2  * evaluate.c   Evaluate complex conditions
   3  *
   4  * Version:     $Id$
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  *
  20  * Copyright 2007  The FreeRADIUS server project
  21  * Copyright 2007  Alan DeKok <aland@deployingradius.com>
  22  */
  23
  24 #include <freeradius-devel/ident.h>
  25 RCSID("$Id$")
  26
  27 #include <freeradius-devel/radiusd.h>
  28 #include <freeradius-devel/modules.h>
  29 #include <freeradius-devel/rad_assert.h>
  30
  31 #include <ctype.h>
  32
  33 #ifdef HAVE_REGEX_H
  34 #include <regex.h>
  35
  36 /*
  37  *  For POSIX Regular expressions.
  38  *  (0) Means no extended regular expressions.
  39  *  REG_EXTENDED means use extended regular expressions.
  40  */
  41 #ifndef REG_EXTENDED
  42 #define REG_EXTENDED (0)
  43 #endif
  44
  45 #ifndef REG_NOSUB
  46 #define REG_NOSUB (0)
  47 #endif
  48 #endif
  49
  50
  51 static int all_digits(const char *string)
  52 {
  53         const char *p = string;
  54
  55         if (*p == '-') p++;
  56
  57         while (isdigit((int) *p)) p++;
  58
  59         return (*p == '\0');
  60 }
  61
  62 #ifndef NDEBUG
  63 #ifndef DEBUG4
  64 #define DEBUG4  if (debug_flag > 4)log_debug
  65 #endif
  66 #else
  67 #define DEBUG4 if (0) log_debug
  68 #endif
  69
  70 static const char *filler = "????????????????????????????????????????????????????????????????";
  71
  72 static const char *expand_string(char *buffer, size_t sizeof_buffer,
  73                                  REQUEST *request,
  74                                  LRAD_TOKEN value_type, const char *value)
  75 {
  76         int result;
  77         char *p;
  78
  79         switch (value_type) {
  80         default:
  81         case T_BARE_WORD:
  82         case T_SINGLE_QUOTED_STRING:
  83                 return value;
  84
  85         case T_BACK_QUOTED_STRING:
  86                 result = radius_exec_program(value, request, 1,
  87                                              buffer, sizeof_buffer, NULL,
  88                                              NULL, 0);
  89                 if (result != 0) {
  90                         return NULL;
  91                 }
  92
  93                 /*
  94                  *      The result should be ASCII.
  95                  */
  96                 for (p = buffer; *p != '\0'; p++) {
  97                         if (*p < ' ' ) {
  98                                 *p = '\0';
  99                                 return buffer;
 100                         }
 101                 }
 102                 return buffer;
 103
 104
 105         case T_DOUBLE_QUOTED_STRING:
 106                 if (!strchr(value, '%')) return value;
 107
 108                 radius_xlat(buffer, sizeof_buffer, value, request, NULL);
 109                 return buffer;
 110         }
 111
 112         return NULL;
 113 }
 114
 115 #ifdef HAVE_REGEX_H
 116 static LRAD_TOKEN getregex(char **ptr, char *buffer, size_t buflen, int *pcflags)
 117 {
 118         char *p = *ptr;
 119         char *q = buffer;
 120
 121         if (*p != '/') return T_OP_INVALID;
 122
 123         *pcflags = REG_EXTENDED;
 124
 125         p++;
 126         while (*p) {
 127                 if (buflen <= 1) break;
 128
 129                 if (*p == '/') {
 130                         p++;
 131
 132                         /*
 133                          *      Check for case insensitivity
 134                          */
 135                         if (*p == 'i') {
 136                                 p++;
 137                                 *pcflags |= REG_ICASE;
 138                         }
 139
 140                         break;
 141                 }
 142
 143                 if (*p == '\\') {
 144                         int x;
 145
 146                         switch (p[1]) {
 147                         case 'r':
 148                                 *q++ = '\r';
 149                                 break;
 150                         case 'n':
 151                                 *q++ = '\n';
 152                                 break;
 153                         case 't':
 154                                 *q++ = '\t';
 155                                 break;
 156                         case '"':
 157                                 *q++ = '"';
 158                                 break;
 159                         case '\'':
 160                                 *q++ = '\'';
 161                                 break;
 162                         case '`':
 163                                 *q++ = '`';
 164                                 break;
 165
 166                                 /*
 167                                  *      FIXME: add 'x' and 'u'
 168                                  */
 169
 170                         default:
 171                                 if ((p[1] >= '0') && (p[1] <= '9') &&
 172                                     (sscanf(p, "%3o", &x) == 1)) {
 173                                         *q++ = x;
 174                                         p += 2;
 175                                 } else {
 176                                         *q++ = p[1];
 177                                 }
 178                                 break;
 179                         }
 180                         p += 2;
 181                         buflen--;
 182                         continue;
 183                 }
 184
 185                 *(q++) = *(p++);
 186                 buflen--;
 187         }
 188         *q = '\0';
 189         *ptr = p;
 190
 191         return T_BARE_WORD;
 192 }
 193 #endif
 194
 195 int radius_evaluate_condition(REQUEST *request, int depth,
 196                               const char **ptr, int evaluate_it, int *presult)
 197 {
 198         int found_condition = FALSE;
 199         int result = TRUE;
 200         int invert = FALSE;
 201         int evaluate_next_condition = evaluate_it;
 202         const char *p = *ptr;
 203         const char *q, *start;
 204         LRAD_TOKEN token, lt, rt;
 205         char left[1024], right[1024], comp[4];
 206         const char *pleft, *pright;
 207         char  xleft[1024], xright[1024];
 208         int lint, rint;
 209 #ifdef HAVE_REGEX_H
 210         int cflags = 0;
 211 #endif
 212
 213         if (!ptr || !*ptr || (depth >= 64)) {
 214                 radlog(L_ERR, "Internal sanity check failed in evaluate condition");
 215                 return FALSE;
 216         }
 217
 218         while (*p) {
 219                 while ((*p == ' ') || (*p == '\t')) p++;
 220
 221                 if (*p == '!') {
 222                         DEBUG4(">>> INVERT");
 223                         invert = TRUE;
 224                         p++;
 225                 }
 226
 227                 /*
 228                  *      It's a subcondition.
 229                  */
 230                 if (*p == '(') {
 231                         const char *end = p + 1;
 232
 233                         /*
 234                          *      Evaluate the condition, bailing out on
 235                          *      parse error.
 236                          */
 237                         DEBUG4(">>> CALLING EVALUATE %s", end);
 238                         if (!radius_evaluate_condition(request, depth + 1,
 239                                                        &end,
 240                                                        evaluate_next_condition,
 241                                                        &result)) {
 242                                 return FALSE;
 243                         }
 244
 245                         if (invert && evaluate_next_condition) {
 246                                 DEBUG2("%.*s Converting !%s -> %s",
 247                                        depth, filler,
 248                                        (result != FALSE) ? "TRUE" : "FALSE",
 249                                        (result == FALSE) ? "TRUE" : "FALSE");
 250
 251
 252                                 result = (result == FALSE);
 253                                 invert = FALSE;
 254                         }
 255
 256                         /*
 257                          *      Start from the end of the previous
 258                          *      condition
 259                          */
 260                         p = end;
 261                         DEBUG4(">>> EVALUATE RETURNED ::%s::", end);
 262
 263                         if (!((*p == ')') || (*p == '!') ||
 264                               ((p[0] == '&') && (p[1] == '&')) ||
 265                               ((p[0] == '|') && (p[1] == '|')))) {
 266
 267                                 radlog(L_ERR, "Parse error in condition at: %s", p);
 268                                 return FALSE;
 269                         }
 270                         if (*p == ')') p++;     /* skip it */
 271                         found_condition = TRUE;
 272
 273                         while ((*p == ' ') || (*p == '\t')) p++;
 274
 275                         /*
 276                          *      EOL.  It's OK.
 277                          */
 278                         if (!*p) {
 279                                 DEBUG4(">>> AT EOL");
 280                                 *ptr = p;
 281                                 *presult = result;
 282                                 return TRUE;
 283
 284                                 /*
 285                                  *      (A && B) means "evaluate B
 286                                  *      only if A was true"
 287                                  */
 288                         } else if ((p[0] == '&') && (p[1] == '&')) {
 289                                 if (result == TRUE) {
 290                                         evaluate_next_condition = evaluate_it;
 291                                 } else {
 292                                         evaluate_next_condition = FALSE;
 293                                 }
 294                                 p += 2;
 295
 296                                 /*
 297                                  *      (A || B) means "evaluate B
 298                                  *      only if A was false"
 299                                  */
 300                         } else if ((p[0] == '|') && (p[1] == '|')) {
 301                                 if (result == FALSE) {
 302                                         evaluate_next_condition = evaluate_it;
 303                                 } else {
 304                                         evaluate_next_condition = FALSE;
 305                                 }
 306                                 p += 2;
 307
 308                         } else if (*p == ')') {
 309                                 DEBUG4(">>> CLOSING BRACE");
 310                                 *ptr = p;
 311                                 *presult = result;
 312                                 return TRUE;
 313
 314                         } else {
 315                                 /*
 316                                  *      Parse error
 317                                  */
 318                                 radlog(L_ERR, "Unexpected trailing text at: %s", p);
 319                                 return FALSE;
 320                         }
 321                 } /* else it wasn't an opening brace */
 322
 323                 while ((*p == ' ') || (*p == '\t')) p++;
 324
 325                 /*
 326                  *      More conditions, keep going.
 327                  */
 328                 if ((*p == '(') || (p[0] == '!')) continue;
 329
 330                 DEBUG4(">>> LOOKING AT %s", p);
 331                 start = p;
 332
 333                 /*
 334                  *      Look for common errors.
 335                  */
 336                 if ((p[0] == '%') && (p[1] == '{')) {
 337                         radlog(L_ERR, "Bare %%{...} is invalid in condition at: %s", p);
 338                         return FALSE;
 339                 }
 340
 341                 /*
 342                  *      Look for word == value
 343                  */
 344                 lt = gettoken(&p, left, sizeof(left));
 345                 if ((lt != T_BARE_WORD) &&
 346                     (lt != T_DOUBLE_QUOTED_STRING) &&
 347                     (lt != T_SINGLE_QUOTED_STRING) &&
 348                     (lt != T_BACK_QUOTED_STRING)) {
 349                         radlog(L_ERR, "Expected string or numbers at: %s", p);
 350                         return FALSE;
 351                 }
 352
 353                 pleft = left;
 354                 if (evaluate_next_condition) {
 355                         pleft = expand_string(xleft, sizeof(xleft), request,
 356                                               lt, left);
 357                         if (!pleft) {
 358                                 radlog(L_ERR, "Failed expanding string at: %s",
 359                                        left);
 360                                 return FALSE;
 361                         }
 362                 }
 363
 364                 /*
 365                  *      Peek ahead.  Maybe it's just a check for
 366                  *      existence.  If so, there shouldn't be anything
 367                  *      else.
 368                  */
 369                 q = p;
 370                 while ((*q == ' ') || (*q == '\t')) q++;
 371
 372                 /*
 373                  *      End of condition,
 374                  */
 375                 if (!*q || (*q == ')') || ((*q == '!') && (q[1] != '=')) ||
 376                     ((q[0] == '&') && (q[1] == '&')) ||
 377                     ((q[0] == '|') && (q[1] == '|'))) {
 378                         /*
 379                          *      Check for truth or falsehood.
 380                          */
 381                         if (all_digits(pleft)) {
 382                                 lint = atoi(pleft);
 383                                 result = (lint != 0);
 384                         } else {
 385                                 result = (*pleft != '\0');
 386                         }
 387
 388                         if (invert) {
 389                                 DEBUG4(">>> INVERTING result");
 390                                 result = (result == FALSE);
 391                                 invert = FALSE;
 392                         }
 393
 394                         if (evaluate_next_condition) {
 395                                 DEBUG2("%.*s Evaluating %s\"%s\" -> %s",
 396                                        depth, filler,
 397                                        invert ? "!" : "", pleft,
 398                                        (result != FALSE) ? "TRUE" : "FALSE");
 399
 400                         } else if (request) {
 401                                 DEBUG2("%.*s Skipping %s\"%s\"",
 402                                        depth, filler,
 403                                        invert ? "!" : "", pleft);
 404                         }
 405
 406                         DEBUG4(">>> I%d %d:%s", invert,
 407                                lt, left);
 408                         goto end_of_condition;
 409                 }
 410
 411                 /*
 412                  *      Else it's a full "foo == bar" thingy.
 413                  */
 414                 token = gettoken(&p, comp, sizeof(comp));
 415                 if ((token < T_OP_NE) || (token > T_OP_CMP_EQ) ||
 416                     (token == T_OP_CMP_TRUE) ||
 417                     (token == T_OP_CMP_FALSE)) {
 418                         radlog(L_ERR, "Expected comparison at: %s", comp);
 419                         return FALSE;
 420                 }
 421
 422                 /*
 423                  *      Look for common errors.
 424                  */
 425                 if ((p[0] == '%') && (p[1] == '{')) {
 426                         radlog(L_ERR, "Bare %%{...} is invalid in condition at: %s", p);
 427                         return FALSE;
 428                 }
 429
 430                 /*
 431                  *      Validate strings.
 432                  */
 433 #ifdef HAVE_REGEX_H
 434                 if ((token == T_OP_REG_EQ) ||
 435                     (token == T_OP_REG_NE)) {
 436                         rt = getregex(&p, right, sizeof(right), &cflags);
 437                 } else
 438 #endif
 439                         rt = gettoken(&p, right, sizeof(right));
 440
 441                 if ((rt != T_BARE_WORD) &&
 442                     (rt != T_DOUBLE_QUOTED_STRING) &&
 443                     (rt != T_SINGLE_QUOTED_STRING) &&
 444                     (rt != T_BACK_QUOTED_STRING)) {
 445                         radlog(L_ERR, "Expected string or numbers at: %s", p);
 446                         return FALSE;
 447                 }
 448
 449                 pright = right;
 450                 if (evaluate_next_condition) {
 451                         pright = expand_string(xright, sizeof(xright), request,
 452                                                rt, right);
 453                         if (!pright) {
 454                                 radlog(L_ERR, "Failed expanding string at: %s",
 455                                        right);
 456                                 return FALSE;
 457                         }
 458                 }
 459
 460                 DEBUG4(">>> %d:%s %d %d:%s",
 461                        lt, pleft, token, rt, pright);
 462
 463                 if (evaluate_next_condition) {
 464                         switch (token) {
 465                         case T_OP_GT:
 466                         case T_OP_LE:
 467                         case T_OP_LT:
 468                                 if (!all_digits(pleft)) {
 469                                         radlog(L_ERR, "Left field is not a number at: %s", pleft);
 470                                         return FALSE;
 471                                 }
 472                                 if (!all_digits(pright)) {
 473                                         radlog(L_ERR, "Right field is not a number at: %s", pright);
 474                                         return FALSE;
 475                                 }
 476                                 lint = atoi(pleft);
 477                                 rint = atoi(pright);
 478                                 break;
 479
 480                         default:
 481                                 break;
 482                         }
 483
 484                         switch (token) {
 485                         case T_OP_CMP_EQ:
 486                                 result = (strcmp(pleft, pright) == 0);
 487                                 break;
 488
 489                         case T_OP_NE:
 490                                 result = (strcmp(pleft, pright) != 0);
 491                                 break;
 492
 493                         case T_OP_GE:
 494                                 result = (lint >= rint);
 495                                 break;
 496
 497                         case T_OP_GT:
 498                                 result = (lint > rint);
 499                                 break;
 500
 501                         case T_OP_LE:
 502                                 result = (lint <= rint);
 503                                 break;
 504
 505                         case T_OP_LT:
 506                                 result = (lint < rint);
 507                                 break;
 508
 509 #ifdef HAVE_REGEX_H
 510                         case T_OP_REG_EQ: {
 511                                 int i, compare;
 512                                 regex_t reg;
 513                                 regmatch_t rxmatch[REQUEST_MAX_REGEX + 1];
 514
 515                                 /*
 516                                  *      Include substring matches.
 517                                  */
 518                                 regcomp(&reg, pright, cflags);
 519                                 compare = regexec(&reg, pleft,
 520                                                   REQUEST_MAX_REGEX + 1,
 521                                                   rxmatch, 0);
 522                                 regfree(&reg);
 523
 524                                 /*
 525                                  *      Add %{0}, %{1}, etc.
 526                                  */
 527                                 for (i = 0; i <= REQUEST_MAX_REGEX; i++) {
 528                                         char *r;
 529                                         char buffer[1024];
 530
 531                                         /*
 532                                          *      Didn't match: delete old
 533                                          *      match, if it existed.
 534                                          */
 535                                         if ((compare != 0) ||
 536                                             (rxmatch[i].rm_so == -1)) {
 537                                                 r = request_data_get(request,
 538                                                                      request,
 539                                                                      REQUEST_DATA_REGEX | i);
 540                                                 if (r) {
 541                                                         free(r);
 542                                                         continue;
 543                                                 }
 544
 545                                                 /*
 546                                                  *      No previous match
 547                                                  *      to delete, stop.
 548                                                  */
 549                                                 break;
 550                                         }
 551
 552                                         /*
 553                                          *      Copy substring into buffer.
 554                                          */
 555                                         memcpy(buffer, pleft + rxmatch[i].rm_so,
 556                                                rxmatch[i].rm_eo - rxmatch[i].rm_so);
 557                                         buffer[rxmatch[i].rm_eo - rxmatch[i].rm_so] = '\0';
 558
 559                                         /*
 560                                          *      Copy substring, and add it to
 561                                          *      the request.
 562                                          *
 563                                          *      Note that we don't check
 564                                          *      for out of memory, which is
 565                                          *      the only error we can get...
 566                                          */
 567                                         r = strdup(buffer);
 568                                         request_data_add(request, request,
 569                                                          REQUEST_DATA_REGEX | i,
 570                                                          r, free);
 571                                 }
 572                                 result = (compare == 0);
 573                         }
 574                                 break;
 575
 576                         case T_OP_REG_NE: {
 577                                 int compare;
 578                                 regex_t reg;
 579                                 regmatch_t rxmatch[REQUEST_MAX_REGEX + 1];
 580
 581                                 /*
 582                                  *      Include substring matches.
 583                                  */
 584                                 regcomp(&reg, pright, cflags);
 585                                 compare = regexec(&reg, pleft,
 586                                                   REQUEST_MAX_REGEX + 1,
 587                                                   rxmatch, 0);
 588                                 regfree(&reg);
 589
 590                                 result = (compare != 0);
 591                         }
 592                                 break;
 593 #endif
 594
 595                         default:
 596                                 DEBUG4(">>> NOT IMPLEMENTED %d", token);
 597                                 break;
 598                         }
 599
 600                         DEBUG2("%.*s Evaluating %s(%.*s) -> %s",
 601                                depth, filler,
 602                                invert ? "!" : "", p - start, start,
 603                                (result != FALSE) ? "TRUE" : "FALSE");
 604
 605                         DEBUG4(">>> GOT result %d", result);
 606
 607                         /*
 608                          *      Not evaluating it.  We may be just
 609                          *      parsing it.
 610                          */
 611                 } else if (request) {
 612                         DEBUG2("%.*s Skipping %s(\"%s\" %s \"%s\")",
 613                                depth, filler,
 614                                invert ? "!" : "", pleft, comp, pright);
 615                 }
 616
 617                 end_of_condition:
 618                 if (invert) {
 619                         DEBUG4(">>> INVERTING result");
 620                         result = (result == FALSE);
 621                         invert = FALSE;
 622                 }
 623
 624                 /*
 625                  *      Don't evaluate it.
 626                  */
 627                 DEBUG4(">>> EVALUATE %d ::%s::",
 628                         evaluate_next_condition, p);
 629
 630                 while ((*p == ' ') || (*p == '\t')) p++;
 631
 632                 /*
 633                  *      Closing brace or EOL, return.
 634                  */
 635                 if (!*p || (*p == ')') || ((*p == '!') && (p[1] != '=')) ||
 636                     ((p[0] == '&') && (p[1] == '&')) ||
 637                     ((p[0] == '|') && (p[1] == '|'))) {
 638                         DEBUG4(">>> AT EOL2a");
 639                         *ptr = p;
 640                         if (evaluate_next_condition) *presult = result;
 641                         return TRUE;
 642                 }
 643         } /* loop over the input condition */
 644
 645         DEBUG4(">>> AT EOL2b");
 646         *ptr = p;
 647         if (evaluate_next_condition) *presult = result;
 648         return TRUE;
 649 }
 650
 651 /*
 652  *      The pairmove() function in src/lib/valuepair.c does all sorts of
 653  *      extra magic that we don't want here.
 654  *
 655  *      FIXME: integrate this with the code calling it, so that we
 656  *      only paircopy() those attributes that we're really going to
 657  *      use.
 658  */
 659 static void my_pairmove(REQUEST *request, VALUE_PAIR **to, VALUE_PAIR *from)
 660 {
 661         int i, j, count, from_count, to_count, tailto;
 662         VALUE_PAIR *vp, *next, **last;
 663         VALUE_PAIR **from_list, **to_list;
 664         int *edited;
 665
 666         /*
 667          *      Set up arrays for editing, to remove some of the
 668          *      O(N^2) dependencies.  This also makes it easier to
 669          *      insert and remove attributes.
 670          *
 671          *      It also means that the operators apply ONLY to the
 672          *      attributes in the original list.  With the previous
 673          *      implementation of pairmove(), adding two attributes
 674          *      via "+=" and then "=" would mean that the second one
 675          *      wasn't added, because of the existence of the first
 676          *      one in the "to" list.  This implementation doesn't
 677          *      have that bug.
 678          *
 679          *      Also, the previous implementation did NOT implement
 680          *      "-=" correctly.  If two of the same attributes existed
 681          *      in the "to" list, and you tried to subtract something
 682          *      matching the *second* value, then the pairdelete()
 683          *      function was called, and the *all* attributes of that
 684          *      number were deleted.  With this implementation, only
 685          *      the matching attributes are deleted.
 686          */
 687         count = 0;
 688         for (vp = from; vp != NULL; vp = vp->next) count++;
 689         from_list = rad_malloc(sizeof(*from_list) * count);
 690
 691         for (vp = *to; vp != NULL; vp = vp->next) count++;
 692         to_list = rad_malloc(sizeof(*to_list) * count);
 693
 694         /*
 695          *      Move the lists to the arrays, and break the list
 696          *      chains.
 697          */
 698         from_count = 0;
 699         for (vp = from; vp != NULL; vp = next) {
 700                 next = vp->next;
 701                 from_list[from_count++] = vp;
 702                 vp->next = NULL;
 703         }
 704
 705         to_count = 0;
 706         for (vp = *to; vp != NULL; vp = next) {
 707                 next = vp->next;
 708                 to_list[to_count++] = vp;
 709                 vp->next = NULL;
 710         }
 711         tailto = to_count;
 712         edited = rad_malloc(sizeof(*edited) * to_count);
 713         memset(edited, 0, sizeof(*edited) * to_count);
 714
 715         DEBUG4("::: FROM %d TO %d MAX %d", from_count, to_count, count);
 716
 717         /*
 718          *      Now that we have the lists initialized, start working
 719          *      over them.
 720          */
 721         for (i = 0; i < from_count; i++) {
 722                 int found;
 723
 724                 DEBUG4("::: Examining %s", from_list[i]->name);
 725
 726                 /*
 727                  *      Attribute should be appended, OR the "to" list
 728                  *      is empty, and we're supposed to replace or
 729                  *      "add if not existing".
 730                  */
 731                 if (from_list[i]->operator == T_OP_ADD) goto append;
 732
 733                 found = FALSE;
 734                 for (j = 0; j < to_count; j++) {
 735                         if (edited[j]) continue;
 736
 737                         /*
 738                          *      Attributes aren't the same, skip them.
 739                          */
 740                         if (from_list[i]->attribute != to_list[j]->attribute) {
 741                                 continue;
 742                         }
 743
 744                         /*
 745                          *      We don't use a "switch" statement here
 746                          *      because we want to break out of the
 747                          *      "for" loop over 'j' in most cases.
 748                          */
 749
 750                         /*
 751                          *      Over-write the FIRST instance of the
 752                          *      matching attribute name.  We free the
 753                          *      one in the "to" list, and move over
 754                          *      the one in the "from" list.
 755                          */
 756                         if (from_list[i]->operator == T_OP_SET) {
 757                                 DEBUG4("::: OVERWRITING %s FROM %d TO %d",
 758                                        to_list[j]->name, i, j);
 759                                 pairfree(&to_list[j]);
 760                                 to_list[j] = from_list[i];
 761                                 from_list[i] = NULL;
 762                                 edited[j] = TRUE;
 763                                 break;
 764                         }
 765
 766                         /*
 767                          *      Add the attribute only if it does not
 768                          *      exist... but it exists, so we stop
 769                          *      looking.
 770                          */
 771                         if (from_list[i]->operator == T_OP_EQ) {
 772                                 found = TRUE;
 773                                 break;
 774                         }
 775
 776                         /*
 777                          *      Delete all matching attributes from
 778                          *      "to"
 779                          */
 780                         if ((from_list[i]->operator == T_OP_SUB) ||
 781                             (from_list[i]->operator == T_OP_LE) ||
 782                             (from_list[i]->operator == T_OP_GE)) {
 783                                 int rcode;
 784                                 int old_op = from_list[i]->operator;
 785
 786                                 /*
 787                                  *      Check for equality.
 788                                  */
 789                                 from_list[i]->operator = T_OP_CMP_EQ;
 790
 791                                 /*
 792                                  *      If equal, delete the one in
 793                                  *      the "to" list.
 794                                  */
 795                                 rcode = radius_compare_vps(NULL, from_list[i],
 796                                                            to_list[j]);
 797                                 /*
 798                                  *      We may want to do more
 799                                  *      subtractions, so we re-set the
 800                                  *      operator back to it's original
 801                                  *      value.
 802                                  */
 803                                 from_list[i]->operator = old_op;
 804
 805                                 switch (old_op) {
 806                                 case T_OP_SUB:
 807                                         if (rcode == 0) {
 808                                                 DEBUG4("::: DELETING %s FROM %d TO %d",
 809                                                        from_list[i]->name, i, j);
 810                                                 pairfree(&to_list[j]);
 811                                                 to_list[j] = NULL;
 812                                         }
 813                                         break;
 814
 815                                         /*
 816                                          *      Enforce <=.  If it's
 817                                          *      >, replace it.
 818                                          */
 819                                 case T_OP_LE:
 820                                         if (rcode > 0) {
 821                                                 DEBUG4("::: REPLACING %s FROM %d TO %d",
 822                                                        from_list[i]->name, i, j);
 823                                                 pairfree(&to_list[j]);
 824                                                 to_list[j] = from_list[i];
 825                                                 from_list[i] = NULL;
 826                                                 edited[j] = TRUE;
 827                                         }
 828                                         break;
 829
 830                                 case T_OP_GE:
 831                                         if (rcode < 0) {
 832                                                 DEBUG4("::: REPLACING %s FROM %d TO %d",
 833                                                        from_list[i]->name, i, j);
 834                                                 pairfree(&to_list[j]);
 835                                                 to_list[j] = from_list[i];
 836                                                 from_list[i] = NULL;
 837                                                 edited[j] = TRUE;
 838                                         }
 839                                         break;
 840                                 }
 841
 842                                 continue;
 843                         }
 844
 845                         rad_assert(0 == 1); /* panic! */
 846                 }
 847
 848                 /*
 849                  *      We were asked to add it if it didn't exist,
 850                  *      and it doesn't exist.  Move it over to the
 851                  *      tail of the "to" list, UNLESS it was already
 852                  *      moved by another operator.
 853                  */
 854                 if (!found && from_list[i]) {
 855                         if ((from_list[i]->operator == T_OP_EQ) ||
 856                             (from_list[i]->operator == T_OP_LE) ||
 857                             (from_list[i]->operator == T_OP_GE) ||
 858                             (from_list[i]->operator == T_OP_SET)) {
 859                         append:
 860                                 DEBUG4("::: APPENDING %s FROM %d TO %d",
 861                                        from_list[i]->name, i, tailto);
 862                                 to_list[tailto++] = from_list[i];
 863                                 from_list[i] = NULL;
 864                         }
 865                 }
 866         }
 867
 868         /*
 869          *      Delete attributes in the "from" list.
 870          */
 871         for (i = 0; i < from_count; i++) {
 872                 if (!from_list[i]) continue;
 873
 874                 pairfree(&from_list[i]);
 875         }
 876         free(from_list);
 877
 878         DEBUG4("::: TO in %d out %d", to_count, tailto);
 879
 880         /*
 881          *      Re-chain the "to" list.
 882          */
 883         *to = NULL;
 884         last = to;
 885         for (i = 0; i < tailto; i++) {
 886                 if (!to_list[i]) continue;
 887
 888                 DEBUG4("::: to[%d] = %s", i, to_list[i]->name);
 889
 890                 *last = to_list[i];
 891                 last = &(*last)->next;
 892
 893                 /*
 894                  *      Fix dumb cache issues
 895                  */
 896                 if ((i >= to_count) || edited[i]) {
 897                         if (to_list[i]->attribute == PW_USER_NAME) {
 898                                 request->username = to_list[i];
 899
 900                         } else if (to_list[i]->attribute == PW_USER_PASSWORD) {
 901                                 request->password = to_list[i];
 902                         }
 903                 }
 904         }
 905         free(to_list);
 906 }
 907
 908
 909 /*
 910  *     Copied shamelessly from conffile.c, to simplify the API for
 911  *     now...
 912  */
 913 typedef enum conf_type {
 914         CONF_ITEM_INVALID = 0,
 915         CONF_ITEM_PAIR,
 916         CONF_ITEM_SECTION,
 917         CONF_ITEM_DATA
 918 } CONF_ITEM_TYPE;
 919
 920 struct conf_item {
 921         struct conf_item *next;
 922         struct conf_part *parent;
 923         int lineno;
 924         const char *filename;
 925         CONF_ITEM_TYPE type;
 926 };
 927 struct conf_pair {
 928         CONF_ITEM item;
 929         char *attr;
 930         char *value;
 931         LRAD_TOKEN operator;
 932         LRAD_TOKEN value_type;
 933 };
 934
 935 /*
 936  *      Add attributes to a list.
 937  */
 938 int radius_update_attrlist(REQUEST *request, CONF_SECTION *cs,
 939                            VALUE_PAIR *input_vps, const char *name)
 940 {
 941         CONF_ITEM *ci;
 942         VALUE_PAIR *newlist, *vp;
 943         VALUE_PAIR **output_vps = NULL;
 944
 945         if (!request || !cs) return RLM_MODULE_INVALID;
 946
 947         if (strcmp(name, "request") == 0) {
 948                 output_vps = &request->packet->vps;
 949
 950         } else if (strcmp(name, "reply") == 0) {
 951                 output_vps = &request->reply->vps;
 952
 953         } else if (strcmp(name, "proxy-request") == 0) {
 954                 if (request->proxy) output_vps = &request->proxy->vps;
 955
 956         } else if (strcmp(name, "proxy-reply") == 0) {
 957                 if (request->proxy_reply) output_vps = &request->proxy_reply->vps;
 958
 959         } else if (strcmp(name, "config") == 0) {
 960                 output_vps = &request->config_items;
 961
 962         } else if (strcmp(name, "control") == 0) {
 963                 output_vps = &request->config_items;
 964
 965         } else {
 966                 return RLM_MODULE_INVALID;
 967         }
 968
 969         if (!output_vps) return RLM_MODULE_NOOP; /* didn't update the list */
 970
 971         newlist = paircopy(input_vps);
 972         if (!newlist) {
 973                 DEBUG2("Out of memory");
 974                 return RLM_MODULE_FAIL;
 975         }
 976
 977         vp = newlist;
 978         for (ci=cf_item_find_next(cs, NULL);
 979              ci != NULL;
 980              ci=cf_item_find_next(cs, ci)) {
 981                 CONF_PAIR *cp;
 982
 983                 /*
 984                  *      This should never happen.
 985                  */
 986                 if (cf_item_is_section(ci)) {
 987                         pairfree(&newlist);
 988                         return RLM_MODULE_INVALID;
 989                 }
 990
 991                 cp = cf_itemtopair(ci);
 992
 993                 /*
 994                  *      The VP && CF lists should be in sync.  If they're
 995                  *      not, panic.
 996                  */
 997                 if (vp->flags.do_xlat) {
 998                         const char *value;
 999                         char buffer[2048];
1000
1001                         value = expand_string(buffer, sizeof(buffer), request,
1002                                               cp->value_type, cp->value);
1003                         if (!value) {
1004                                 pairfree(&newlist);
1005                                 return RLM_MODULE_INVALID;
1006                         }
1007
1008                         if (!pairparsevalue(vp, value)) {
1009                                 DEBUG2("ERROR: Failed parsing value \"%s\" for attribute %s: %s",
1010                                        value, vp->name, librad_errstr);
1011                                 pairfree(&newlist);
1012                                 return RLM_MODULE_FAIL;
1013                         }
1014                         vp->flags.do_xlat = 0;
1015                 }
1016                 vp = vp->next;
1017         }
1018
1019         my_pairmove(request, output_vps, newlist);
1020
1021         return RLM_MODULE_UPDATED;
1022 }
1023
1024