src/main/xlat.c

   1 /*
   2  * xlat.c       Translate strings.  This is the first version of xlat
   3  *              incorporated to RADIUS
   4  *
   5  * Version:     $Id$
   6  *
   7  *   This program is free software; you can redistribute it and/or modify
   8  *   it under the terms of the GNU General Public License as published by
   9  *   the Free Software Foundation; either version 2 of the License, or
  10  *   (at your option) any later version.
  11  *
  12  *   This program is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *   GNU General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU General Public License
  18  *   along with this program; if not, write to the Free Software
  19  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  * Copyright 2000  The FreeRADIUS server project
  22  * Copyright 2000  Alan DeKok <aland@ox.org>
  23  */
  24
  25 static const char rcsid[] =
  26 "$Id$";
  27
  28 #include        <freeradius-devel/autoconf.h>
  29
  30 #include        <stdio.h>
  31 #include        <stdlib.h>
  32 #include        <string.h>
  33 #include        <ctype.h>
  34
  35 #include        <freeradius-devel/radiusd.h>
  36
  37 #include        <freeradius-devel/rad_assert.h>
  38
  39 typedef struct xlat_t {
  40         char            module[MAX_STRING_LEN];
  41         int             length;
  42         void            *instance;
  43         RAD_XLAT_FUNC   do_xlat;
  44         int             internal;       /* not allowed to re-define these */
  45 } xlat_t;
  46
  47 static rbtree_t *xlat_root = NULL;
  48
  49 /*
  50  *      Define all xlat's in the structure.
  51  */
  52 static const char * const internal_xlat[] = {"check",
  53                                              "request",
  54                                              "reply",
  55                                              "proxy-request",
  56                                              "proxy-reply",
  57                                              NULL};
  58
  59 #if REQUEST_MAX_REGEX > 8
  60 #error Please fix the following line
  61 #endif
  62 static const int xlat_inst[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8 };   /* up to 8 for regex */
  63
  64
  65 /*
  66  *      Convert the value on a VALUE_PAIR to string
  67  */
  68 static int valuepair2str(char * out,int outlen,VALUE_PAIR * pair,
  69                          int type, RADIUS_ESCAPE_STRING func)
  70 {
  71         char buffer[MAX_STRING_LEN * 4];
  72
  73         if (pair != NULL) {
  74                 vp_prints_value(buffer, sizeof(buffer), pair, -1);
  75                 return func(out, outlen, buffer);
  76         }
  77
  78         switch (type) {
  79         case PW_TYPE_STRING :
  80                 strNcpy(out,"_",outlen);
  81                 break;
  82         case PW_TYPE_INTEGER :
  83                 strNcpy(out,"0",outlen);
  84                 break;
  85         case PW_TYPE_IPADDR :
  86                 strNcpy(out,"?.?.?.?",outlen);
  87                 break;
  88         case PW_TYPE_IPV6ADDR :
  89                 strNcpy(out,":?:",outlen);
  90                 break;
  91         case PW_TYPE_DATE :
  92                 strNcpy(out,"0",outlen);
  93                 break;
  94         default :
  95                 strNcpy(out,"unknown_type",outlen);
  96         }
  97         return strlen(out);
  98 }
  99
 100
 101 /*
 102  *      Dynamically translate for check:, request:, reply:, etc.
 103  */
 104 static int xlat_packet(void *instance, REQUEST *request,
 105                        char *fmt, char *out, size_t outlen,
 106                        RADIUS_ESCAPE_STRING func)
 107 {
 108         DICT_ATTR       *da;
 109         VALUE_PAIR      *vp;
 110         VALUE_PAIR      *vps = NULL;
 111         RADIUS_PACKET   *packet = NULL;
 112
 113         switch (*(int*) instance) {
 114         case 0:
 115                 vps = request->config_items;
 116                 break;
 117
 118         case 1:
 119                 vps = request->packet->vps;
 120                 packet = request->packet;
 121                 break;
 122
 123         case 2:
 124                 vps = request->reply->vps;
 125                 packet = request->reply;
 126                 break;
 127
 128         case 3:
 129                 if (request->proxy) vps = request->proxy->vps;
 130                 packet = request->proxy;
 131                 break;
 132
 133         case 4:
 134                 if (request->proxy_reply) vps = request->proxy_reply->vps;
 135                 packet = request->proxy_reply;
 136                 break;
 137
 138         default:                /* WTF? */
 139                 return 0;
 140         }
 141
 142         /*
 143          *      The "format" string is the attribute name.
 144          */
 145         da = dict_attrbyname(fmt);
 146         if (!da) {
 147                 int count;
 148                 const char *p = strchr(fmt, '[');
 149                 char buffer[256];
 150
 151                 if (!p) return 0;
 152                 if (strlen(fmt) > sizeof(buffer)) return 0;
 153
 154                 strNcpy(buffer, fmt, p - fmt + 1);
 155
 156                 da = dict_attrbyname(buffer);
 157                 if (!da) return 0;
 158
 159                 /*
 160                  *      %{Attribute-Name[#]} returns the count of
 161                  *      attributes of that name in the list.
 162                  */
 163                 if ((p[1] == '#') && (p[2] == ']')) {
 164                         count = 0;
 165
 166                         for (vp = pairfind(vps, da->attr);
 167                              vp != NULL;
 168                              vp = pairfind(vp->next, da->attr)) {
 169                                 count++;
 170                         }
 171                         snprintf(out, outlen, "%d", count);
 172                         return strlen(out);
 173                 }
 174
 175                 /*
 176                  *      %{Attribute-Name[*]} returns ALL of the
 177                  *      the attributes, separated by a newline.
 178                  */
 179                 if ((p[1] == '*') && (p[2] == ']')) {
 180                         int total = 0;
 181
 182                         for (vp = pairfind(vps, da->attr);
 183                              vp != NULL;
 184                              vp = pairfind(vp->next, da->attr)) {
 185                                 count = valuepair2str(out, outlen - 1, vp, da->type, func);
 186                                 rad_assert(count <= outlen);
 187                                 total += count + 1;
 188                                 outlen -= (count + 1);
 189                                 out += count;
 190
 191                                 *(out++) = '\n';
 192
 193                                 if (outlen == 0) break;
 194                         }
 195
 196                         return total;
 197                 }
 198
 199                 count = atoi(p + 1);
 200
 201                 /*
 202                  *      Skip the numbers.
 203                  */
 204                 p += 1 + strspn(p + 1, "0123456789");
 205                 if (*p != ']') {
 206                         DEBUG2("xlat: Invalid array reference in string at %s %s",
 207                                fmt, p);
 208                         return 0;
 209                 }
 210
 211                 /*
 212                  *      Find the N'th value.
 213                  */
 214                 for (vp = pairfind(vps, da->attr);
 215                      vp != NULL;
 216                      vp = pairfind(vp->next, da->attr)) {
 217                         if (count == 0) break;
 218                         count--;
 219                 }
 220
 221                 /*
 222                  *      Non-existent array reference.
 223                  */
 224                 if (!vp) return 0;
 225
 226                 return valuepair2str(out, outlen, vp, da->type, func);
 227         }
 228
 229         vp = pairfind(vps, da->attr);
 230         if (!vp) {
 231                 /*
 232                  *      Some "magic" handlers, which are never in VP's, but
 233                  *      which are in the packet.
 234                  *
 235                  *      FIXME: We should really do this in a more
 236                  *      intelligent way...
 237                  */
 238                 if (packet) {
 239                         VALUE_PAIR localvp;
 240
 241                         localvp.vp_strvalue[0] = 0;
 242
 243                         switch (da->attr) {
 244                         case PW_PACKET_TYPE:
 245                         {
 246                                 DICT_VALUE *dval;
 247
 248                                 dval = dict_valbyattr(da->attr, packet->code);
 249                                 if (dval) {
 250                                         snprintf(out, outlen, "%s", dval->name);
 251                                 } else {
 252                                         snprintf(out, outlen, "%d", packet->code);
 253                                 }
 254                                 return strlen(out);
 255                         }
 256                         break;
 257
 258                         case PW_CLIENT_IP_ADDRESS: /* the same as below */
 259                         case PW_PACKET_SRC_IP_ADDRESS:
 260                                 if (packet->src_ipaddr.af != AF_INET) {
 261                                         return 0;
 262                                 }
 263                                 localvp.attribute = da->attr;
 264                                 localvp.lvalue = packet->src_ipaddr.ipaddr.ip4addr.s_addr;
 265                                 break;
 266
 267                         case PW_PACKET_DST_IP_ADDRESS:
 268                                 if (packet->dst_ipaddr.af != AF_INET) {
 269                                         return 0;
 270                                 }
 271                                 localvp.attribute = da->attr;
 272                                 localvp.lvalue = packet->dst_ipaddr.ipaddr.ip4addr.s_addr;
 273                                 break;
 274
 275                         case PW_PACKET_SRC_PORT:
 276                                 localvp.attribute = da->attr;
 277                                 localvp.lvalue = packet->src_port;
 278                                 break;
 279
 280                         case PW_PACKET_DST_PORT:
 281                                 localvp.attribute = da->attr;
 282                                 localvp.lvalue = packet->dst_port;
 283                                 break;
 284
 285                         case PW_PACKET_AUTHENTICATION_VECTOR:
 286                                 localvp.attribute = da->attr;
 287                                 memcpy(localvp.vp_strvalue, packet->vector,
 288                                        sizeof(packet->vector));
 289                                 localvp.length = sizeof(packet->vector);
 290                                 break;
 291
 292                                 /*
 293                                  *      Authorization, accounting, etc.
 294                                  */
 295                         case PW_REQUEST_PROCESSING_STAGE:
 296                                 if (request->component) {
 297                                         strNcpy(out, request->component, outlen);
 298                                 } else {
 299                                         strNcpy(out, "server_core", outlen);
 300                                 }
 301                                 return strlen(out);
 302
 303                         case PW_PACKET_SRC_IPV6_ADDRESS:
 304                                 if (packet->src_ipaddr.af != AF_INET6) {
 305                                         return 0;
 306                                 }
 307                                 localvp.attribute = da->attr;
 308                                 memcpy(localvp.vp_strvalue,
 309                                        &packet->src_ipaddr.ipaddr.ip4addr.s_addr,
 310                                        sizeof(packet->src_ipaddr.ipaddr.ip4addr.s_addr));
 311                                 break;
 312
 313                         case PW_PACKET_DST_IPV6_ADDRESS:
 314                                 if (packet->dst_ipaddr.af != AF_INET6) {
 315                                         return 0;
 316                                 }
 317                                 localvp.attribute = da->attr;
 318                                 memcpy(localvp.vp_strvalue,
 319                                        &packet->dst_ipaddr.ipaddr.ip4addr.s_addr,
 320                                        sizeof(packet->dst_ipaddr.ipaddr.ip4addr.s_addr));
 321                                 break;
 322
 323                         case PW_SERVER_IDENTITY:
 324                                 if (!request->listener || !request->listener->identity) return 0;
 325
 326                                 snprintf(out, outlen, "%s", request->listener->identity);
 327                                 return strlen(out);
 328                                 break;
 329
 330                         default:
 331                                 return 0; /* not found */
 332                                 break;
 333                         }
 334
 335                         localvp.type = da->type;
 336                         return valuepair2str(out, outlen, &localvp,
 337                                              da->type, func);
 338                 }
 339
 340                 /*
 341                  *      Not found, die.
 342                  */
 343                 return 0;
 344         }
 345
 346         if (!vps) return 0;     /* silently fail */
 347
 348         /*
 349          *      Convert the VP to a string, and return it.
 350          */
 351         return valuepair2str(out, outlen, vp, da->type, func);
 352 }
 353
 354 #ifdef HAVE_REGEX_H
 355 /*
 356  *      Pull %{0} to %{8} out of the packet.
 357  */
 358 static int xlat_regex(void *instance, REQUEST *request,
 359                       char *fmt, char *out, size_t outlen,
 360                       RADIUS_ESCAPE_STRING func)
 361 {
 362         char *regex;
 363
 364         /*
 365          *      We cheat: fmt is "0" to "8", but those numbers
 366          *      are already in the "instance".
 367          */
 368         fmt = fmt;              /* -Wunused */
 369         func = func;            /* -Wunused FIXME: do escaping? */
 370
 371         regex = request_data_reference(request, request,
 372                                  REQUEST_DATA_REGEX | *(int *)instance);
 373         if (!regex) return 0;
 374
 375         /*
 376          *      Copy UP TO "freespace" bytes, including
 377          *      a zero byte.
 378          */
 379         strNcpy(out, regex, outlen);
 380         return strlen(out);
 381 }
 382 #endif                          /* HAVE_REGEX_H */
 383
 384 /*
 385  *      Compare two xlat_t structs, based ONLY on the module name.
 386  */
 387 static int xlat_cmp(const void *a, const void *b)
 388 {
 389         if (((const xlat_t *)a)->length != ((const xlat_t *)b)->length) {
 390                 return ((const xlat_t *)a)->length - ((const xlat_t *)b)->length;
 391         }
 392
 393         return memcmp(((const xlat_t *)a)->module,
 394                       ((const xlat_t *)b)->module,
 395                       ((const xlat_t *)a)->length);
 396 }
 397
 398
 399 /*
 400  *      find the appropriate registered xlat function.
 401  */
 402 static const xlat_t *xlat_find(const char *module)
 403 {
 404         xlat_t my_xlat;
 405
 406         /*
 407          *      Look for dictionary attributes first.
 408          */
 409         if ((dict_attrbyname(module) != NULL) ||
 410             (strchr(module, '[') != NULL)) {
 411                 static const xlat_t dict_xlat = {
 412                         "request",
 413                         7,
 414                         &xlat_inst[1],
 415                         xlat_packet,
 416                         TRUE
 417                 };
 418
 419                 return &dict_xlat;
 420         }
 421
 422         strNcpy(my_xlat.module, module, sizeof(my_xlat.module));
 423         my_xlat.length = strlen(my_xlat.module);
 424
 425         return rbtree_finddata(xlat_root, &my_xlat);
 426 }
 427
 428
 429 /*
 430  *      Register an xlat function.
 431  */
 432 int xlat_register(const char *module, RAD_XLAT_FUNC func, void *instance)
 433 {
 434         xlat_t  *c;
 435         xlat_t  my_xlat;
 436
 437         if ((module == NULL) || (strlen(module) == 0)) {
 438                 DEBUG("xlat_register: Invalid module name");
 439                 return -1;
 440         }
 441
 442         /*
 443          *      First time around, build up the tree...
 444          *
 445          *      FIXME: This code should be hoisted out of this function,
 446          *      and into a global "initialization".  But it isn't critical...
 447          */
 448         if (!xlat_root) {
 449                 int i;
 450 #ifdef HAVE_REGEX_H
 451                 char buffer[2];
 452 #endif
 453
 454                 xlat_root = rbtree_create(xlat_cmp, free, 0);
 455                 if (!xlat_root) {
 456                         DEBUG("xlat_register: Failed to create tree.");
 457                         return -1;
 458                 }
 459
 460                 /*
 461                  *      Register the internal packet xlat's.
 462                  */
 463                 for (i = 0; internal_xlat[i] != NULL; i++) {
 464                         xlat_register(internal_xlat[i], xlat_packet, &xlat_inst[i]);
 465                         c = xlat_find(internal_xlat[i]);
 466                         rad_assert(c != NULL);
 467                         c->internal = TRUE;
 468                 }
 469
 470 #ifdef HAVE_REGEX_H
 471                 /*
 472                  *      Register xlat's for regexes.
 473                  */
 474                 buffer[1] = '\0';
 475                 for (i = 0; i <= REQUEST_MAX_REGEX; i++) {
 476                         buffer[0] = '0' + i;
 477                         xlat_register(buffer, xlat_regex, &xlat_inst[i]);
 478                         c = xlat_find(buffer);
 479                         rad_assert(c != NULL);
 480                         c->internal = TRUE;
 481                 }
 482 #endif /* HAVE_REGEX_H */
 483         }
 484
 485         /*
 486          *      If it already exists, replace the instance.
 487          */
 488         strNcpy(my_xlat.module, module, sizeof(my_xlat.module));
 489         my_xlat.length = strlen(my_xlat.module);
 490         c = rbtree_finddata(xlat_root, &my_xlat);
 491         if (c) {
 492                 if (c->internal) {
 493                         DEBUG("xlat_register: Cannot re-define internal xlat");
 494                         return -1;
 495                 }
 496
 497                 c->do_xlat = func;
 498                 c->instance = instance;
 499                 return 0;
 500         }
 501
 502         /*
 503          *      Doesn't exist.  Create it.
 504          */
 505         c = rad_malloc(sizeof(xlat_t));
 506         memset(c, 0, sizeof(*c));
 507
 508         c->do_xlat = func;
 509         strNcpy(c->module, module, sizeof(c->module));
 510         c->length = strlen(c->module);
 511         c->instance = instance;
 512
 513         rbtree_insert(xlat_root, c);
 514
 515         return 0;
 516 }
 517
 518 /*
 519  *      Unregister an xlat function.
 520  *
 521  *      We can only have one function to call per name, so the
 522  *      passing of "func" here is extraneous.
 523  */
 524 void xlat_unregister(const char *module, RAD_XLAT_FUNC func)
 525 {
 526         rbnode_t        *node;
 527         xlat_t          my_xlat;
 528
 529         func = func;            /* -Wunused */
 530
 531         if (!module) return;
 532
 533         strNcpy(my_xlat.module, module, sizeof(my_xlat.module));
 534         my_xlat.length = strlen(my_xlat.module);
 535
 536         node = rbtree_find(xlat_root, &my_xlat);
 537         if (!node) return;
 538
 539         rbtree_delete(xlat_root, node);
 540 }
 541
 542 /*
 543  *      De-register all xlat functions,
 544  *      used mainly for debugging.
 545  */
 546 void xlat_free(void)
 547 {
 548         rbtree_free(xlat_root);
 549 }
 550
 551
 552 /*
 553  *      Decode an attribute name into a string.
 554  */
 555 static void decode_attribute(const char **from, char **to, int freespace,
 556                              int *open, REQUEST *request,
 557                              RADIUS_ESCAPE_STRING func)
 558 {
 559         int     do_length = 0;
 560         char    xlat_name[128];
 561         char    *xlat_string = NULL; /* can be large */
 562         int     free_xlat_string = FALSE;
 563         const char *p;
 564         char *q, *pa;
 565         int found=0, retlen=0;
 566         int openbraces = *open;
 567         const xlat_t *c;
 568
 569         p = *from;
 570         q = *to;
 571         pa = &xlat_name[0];
 572
 573         *q = '\0';
 574
 575         /*
 576          * Skip the '{' at the front of 'p'
 577          * Increment open braces
 578          */
 579         p++;
 580         openbraces++;
 581
 582         if (*p == '#') {
 583                 p++;
 584                 do_length = 1;
 585         }
 586
 587         /*
 588          *      First, copy the xlat key name to one buffer
 589          */
 590         while (*p && (*p != '}') && (*p != ':')) {
 591                 *pa++ = *p++;
 592
 593                 if (pa >= (xlat_name + sizeof(xlat_name) - 1)) {
 594                         /*
 595                          *      Skip to the end of the input
 596                          */
 597                         p += strlen(p);
 598                         DEBUG("xlat: Module name is too long in string %%%s",
 599                               *from);
 600                         goto done;
 601                 }
 602         }
 603         *pa = '\0';
 604
 605         if (!*p) {
 606                 DEBUG("xlat: Invalid syntax in %s", *from);
 607
 608                 /*
 609                  *      %{name} is a simple attribute reference,
 610                  *      or regex reference.
 611                  */
 612         } else if (*p == '}') {
 613                 openbraces--;
 614                 rad_assert(openbraces == *open);
 615
 616                 p++;
 617                 xlat_string = xlat_name;
 618                 goto do_xlat;
 619
 620         } else if (p[1] == '-') { /* handle ':- */
 621                 p += 2;
 622                 xlat_string = xlat_name;
 623                 goto do_xlat;
 624
 625         } else {      /* module name, followed by per-module string */
 626                 int stop = 0;
 627                 int delimitbrace = *open;
 628
 629                 rad_assert(*p == ':');
 630                 p++;                    /* skip the ':' */
 631
 632                 /*
 633                  *  If there's a brace immediately following the colon,
 634                  *  then we've chosen to delimite the per-module string,
 635                  *  so keep track of that.
 636                  */
 637                 if (*p == '{') {
 638                         delimitbrace = openbraces;
 639                         openbraces++;
 640                         p++;
 641                 }
 642
 643                 xlat_string = rad_malloc(strlen(p) + 1); /* always returns */
 644                 free_xlat_string = TRUE;
 645                 pa = xlat_string;
 646
 647                 /*
 648                  *  Copy over the rest of the string, which is per-module
 649                  *  data.
 650                  */
 651                 while (*p && !stop) {
 652                         switch(*p) {
 653                                 /*
 654                                  *      What the heck is this supposed
 655                                  *      to be doing?
 656                                  */
 657                         case '\\':
 658                                 p++; /* skip it */
 659                                 *pa++ = *p++;
 660                                 break;
 661
 662                                 /*
 663                                  *      This is pretty hokey...  we
 664                                  *      should use the functions in
 665                                  *      util.c
 666                                  */
 667                         case '{':
 668                                 openbraces++;
 669                                 *pa++ = *p++;
 670                                 break;
 671
 672                         case '}':
 673                                 openbraces--;
 674                                 if (openbraces == delimitbrace) {
 675                                         p++;
 676                                         stop=1;
 677                                 } else {
 678                                         *pa++ = *p++;
 679                                 }
 680                                 break;
 681
 682                         default:
 683                                 *pa++ = *p++;
 684                                 break;
 685                         }
 686                 }
 687
 688                 *pa = '\0';
 689
 690                 /*
 691                  *      Now check to see if we're at the end of the string
 692                  *      we were sent.  If we're not, check for :-
 693                  */
 694                 if (openbraces == delimitbrace) {
 695                         if (p[0] == ':' && p[1] == '-') {
 696                                 p += 2;
 697                         }
 698                 }
 699
 700                 /*
 701                  *      Look up almost everything in the new tree of xlat
 702                  *      functions.  This makes it a little quicker...
 703                  */
 704         do_xlat:
 705                 if ((c = xlat_find(xlat_name)) != NULL) {
 706                         if (!c->internal) DEBUG("radius_xlat: Running registered xlat function of module %s for string \'%s\'",
 707                                                 c->module, xlat_string);
 708                         retlen = c->do_xlat(c->instance, request, xlat_string,
 709                                             q, freespace, func);
 710                         /* If retlen is 0, treat it as not found */
 711                         if (retlen > 0) found = 1;
 712 #ifndef NDEBUG
 713                 } else {
 714                         /*
 715                          *      No attribute by that name, return an error.
 716                          */
 717                         DEBUG2("WARNING: Unknown module \"%s\" in string expansion \"%%%s\"", xlat_name, *from);
 718 #endif
 719                 }
 720         }
 721
 722         /*
 723          * Skip to last '}' if attr is found
 724          * The rest of the stuff within the braces is
 725          * useless if we found what we need
 726          */
 727         if (found) {
 728                 if (do_length) {
 729                         snprintf(q, freespace, "%d", retlen);
 730                         retlen = strlen(q);
 731                 }
 732
 733                 q += retlen;
 734
 735                 while((*p != '\0') && (openbraces > 0)) {
 736                         /*
 737                          *      Handle escapes outside of the loop.
 738                          */
 739                         if (*p == '\\') {
 740                                 p++;
 741                                 if (!*p) break;
 742                                 p++; /* get & ignore next character */
 743                                 continue;
 744                         }
 745
 746                         switch (*p) {
 747                         default:
 748                                 break;
 749
 750                                 /*
 751                                  *  Bare brace
 752                                  */
 753                         case '{':
 754                                 openbraces++;
 755                                 break;
 756
 757                         case '}':
 758                                 openbraces--;
 759                                 break;
 760                         }
 761                         p++;    /* skip the character */
 762                 }
 763         }
 764
 765         done:
 766         if (free_xlat_string) free(xlat_string);
 767
 768         *open = openbraces;
 769         *from = p;
 770         *to = q;
 771 }
 772
 773 /*
 774  *  If the caller doesn't pass xlat an escape function, then
 775  *  we use this one.  It simplifies the coding, as the check for
 776  *  func == NULL only happens once.
 777  */
 778 static int xlat_copy(char *out, int outlen, const char *in)
 779 {
 780         int freespace = outlen;
 781
 782         rad_assert(outlen > 0);
 783
 784         while ((*in) && (freespace > 1)) {
 785                 /*
 786                  *  Copy data.
 787                  *
 788                  *  FIXME: Do escaping of bad stuff!
 789                  */
 790                 *(out++) = *(in++);
 791
 792                 freespace--;
 793         }
 794         *out = '\0';
 795
 796         return (outlen - freespace); /* count does not include NUL */
 797 }
 798
 799 /*
 800  *      Replace %<whatever> in a string.
 801  *
 802  *      See 'doc/variables.txt' for more information.
 803  */
 804 int radius_xlat(char *out, int outlen, const char *fmt,
 805                 REQUEST *request, RADIUS_ESCAPE_STRING func)
 806 {
 807         int c, len, freespace;
 808         const char *p;
 809         char *q;
 810         char *nl;
 811         VALUE_PAIR *tmp;
 812         struct tm *TM, s_TM;
 813         char tmpdt[40]; /* For temporary storing of dates */
 814         int openbraces=0;
 815
 816         /*
 817          *      Catch bad modules.
 818          */
 819         if (!fmt || !out || !request) return 0;
 820
 821         /*
 822          *  Ensure that we always have an escaping function.
 823          */
 824         if (func == NULL) {
 825                 func = xlat_copy;
 826         }
 827
 828         q = out;
 829         p = fmt;
 830         while (*p) {
 831                 /* Calculate freespace in output */
 832                 freespace = outlen - (q - out);
 833                 if (freespace <= 1)
 834                         break;
 835                 c = *p;
 836
 837                 if ((c != '%') && (c != '$') && (c != '\\')) {
 838                         /*
 839                          * We check if we're inside an open brace.  If we are
 840                          * then we assume this brace is NOT literal, but is
 841                          * a closing brace and apply it
 842                          */
 843                         if ((c == '}') && openbraces) {
 844                                 openbraces--;
 845                                 p++; /* skip it */
 846                                 continue;
 847                         }
 848                         *q++ = *p++;
 849                         continue;
 850                 }
 851
 852                 /*
 853                  *      There's nothing after this character, copy
 854                  *      the last '%' or "$' or '\\' over to the output
 855                  *      buffer, and exit.
 856                  */
 857                 if (*++p == '\0') {
 858                         *q++ = c;
 859                         break;
 860                 }
 861
 862                 if (c == '\\') {
 863                         switch(*p) {
 864                         case '\\':
 865                                 *q++ = *p;
 866                                 break;
 867                         case 't':
 868                                 *q++ = '\t';
 869                                 break;
 870                         case 'n':
 871                                 *q++ = '\n';
 872                                 break;
 873                         default:
 874                                 *q++ = c;
 875                                 *q++ = *p;
 876                                 break;
 877                         }
 878                         p++;
 879
 880                         /*
 881                          *      Hmmm... ${User-Name} is a synonym for
 882                          *      %{User-Name}.
 883                          *
 884                          *      Why, exactly?
 885                          */
 886                 } else if (c == '$') switch(*p) {
 887                         case '{': /* Attribute by Name */
 888                                 decode_attribute(&p, &q, freespace, &openbraces, request, func);
 889                                 break;
 890                         default:
 891                                 *q++ = c;
 892                                 *q++ = *p++;
 893                                 break;
 894
 895                 } else if (c == '%') switch(*p) {
 896                         case '{':
 897                                 decode_attribute(&p, &q, freespace, &openbraces, request, func);
 898                                 break;
 899
 900                         case '%':
 901                                 *q++ = *p++;
 902                                 break;
 903                         case 'a': /* Protocol: */
 904                                 q += valuepair2str(q,freespace,pairfind(request->reply->vps,PW_FRAMED_PROTOCOL),PW_TYPE_INTEGER, func);
 905                                 p++;
 906                                 break;
 907                         case 'c': /* Callback-Number */
 908                                 q += valuepair2str(q,freespace,pairfind(request->reply->vps,PW_CALLBACK_NUMBER),PW_TYPE_STRING, func);
 909                                 p++;
 910                                 break;
 911                         case 'd': /* request day */
 912                                 TM = localtime_r(&request->timestamp, &s_TM);
 913                                 len = strftime(tmpdt, sizeof(tmpdt), "%d", TM);
 914                                 if (len > 0) {
 915                                         strNcpy(q, tmpdt, freespace);
 916                                         q += strlen(q);
 917                                 }
 918                                 p++;
 919                                 break;
 920                         case 'f': /* Framed IP address */
 921                                 q += valuepair2str(q,freespace,pairfind(request->reply->vps,PW_FRAMED_IP_ADDRESS),PW_TYPE_IPADDR, func);
 922                                 p++;
 923                                 break;
 924                         case 'i': /* Calling station ID */
 925                                 q += valuepair2str(q,freespace,pairfind(request->packet->vps,PW_CALLING_STATION_ID),PW_TYPE_STRING, func);
 926                                 p++;
 927                                 break;
 928                         case 'l': /* request timestamp */
 929                                 snprintf(tmpdt, sizeof(tmpdt), "%lu",
 930                                          (unsigned long) request->timestamp);
 931                                 strNcpy(q,tmpdt,freespace);
 932                                 q += strlen(q);
 933                                 p++;
 934                                 break;
 935                         case 'm': /* request month */
 936                                 TM = localtime_r(&request->timestamp, &s_TM);
 937                                 len = strftime(tmpdt, sizeof(tmpdt), "%m", TM);
 938                                 if (len > 0) {
 939                                         strNcpy(q, tmpdt, freespace);
 940                                         q += strlen(q);
 941                                 }
 942                                 p++;
 943                                 break;
 944                         case 'n': /* NAS IP address */
 945                                 q += valuepair2str(q,freespace,pairfind(request->packet->vps,PW_NAS_IP_ADDRESS),PW_TYPE_IPADDR, func);
 946                                 p++;
 947                                 break;
 948                         case 'p': /* Port number */
 949                                 q += valuepair2str(q,freespace,pairfind(request->packet->vps,PW_NAS_PORT),PW_TYPE_INTEGER, func);
 950                                 p++;
 951                                 break;
 952                         case 's': /* Speed */
 953                                 q += valuepair2str(q,freespace,pairfind(request->packet->vps,PW_CONNECT_INFO),PW_TYPE_STRING, func);
 954                                 p++;
 955                                 break;
 956                         case 't': /* request timestamp */
 957                                 CTIME_R(&request->timestamp, tmpdt, sizeof(tmpdt));
 958                                 nl = strchr(tmpdt, '\n');
 959                                 if (nl) *nl = '\0';
 960                                 strNcpy(q, tmpdt, freespace);
 961                                 q += strlen(q);
 962                                 p++;
 963                                 break;
 964                         case 'u': /* User name */
 965                                 q += valuepair2str(q,freespace,pairfind(request->packet->vps,PW_USER_NAME),PW_TYPE_STRING, func);
 966                                 p++;
 967                                 break;
 968                         case 'A': /* radacct_dir */
 969                                 strNcpy(q,radacct_dir,freespace-1);
 970                                 q += strlen(q);
 971                                 p++;
 972                                 break;
 973                         case 'C': /* ClientName */
 974                                 strNcpy(q,client_name_old(&request->packet->src_ipaddr),freespace-1);
 975                                 q += strlen(q);
 976                                 p++;
 977                                 break;
 978                         case 'D': /* request date */
 979                                 TM = localtime_r(&request->timestamp, &s_TM);
 980                                 len = strftime(tmpdt, sizeof(tmpdt), "%Y%m%d", TM);
 981                                 if (len > 0) {
 982                                         strNcpy(q, tmpdt, freespace);
 983                                         q += strlen(q);
 984                                 }
 985                                 p++;
 986                                 break;
 987                         case 'H': /* request hour */
 988                                 TM = localtime_r(&request->timestamp, &s_TM);
 989                                 len = strftime(tmpdt, sizeof(tmpdt), "%H", TM);
 990                                 if (len > 0) {
 991                                         strNcpy(q, tmpdt, freespace);
 992                                         q += strlen(q);
 993                                 }
 994                                 p++;
 995                                 break;
 996                         case 'L': /* radlog_dir */
 997                                 strNcpy(q,radlog_dir,freespace-1);
 998                                 q += strlen(q);
 999                                 p++;
1000                                 break;
1001                         case 'M': /* MTU */
1002                                 q += valuepair2str(q,freespace,pairfind(request->reply->vps,PW_FRAMED_MTU),PW_TYPE_INTEGER, func);
1003                                 p++;
1004                                 break;
1005                         case 'R': /* radius_dir */
1006                                 strNcpy(q,radius_dir,freespace-1);
1007                                 q += strlen(q);
1008                                 p++;
1009                                 break;
1010                         case 'S': /* request timestamp in SQL format*/
1011                                 TM = localtime_r(&request->timestamp, &s_TM);
1012                                 len = strftime(tmpdt, sizeof(tmpdt), "%Y-%m-%d %H:%M:%S", TM);
1013                                 if (len > 0) {
1014                                         strNcpy(q, tmpdt, freespace);
1015                                         q += strlen(q);
1016                                 }
1017                                 p++;
1018                                 break;
1019                         case 'T': /* request timestamp */
1020                                 TM = localtime_r(&request->timestamp, &s_TM);
1021                                 len = strftime(tmpdt, sizeof(tmpdt), "%Y-%m-%d-%H.%M.%S.000000", TM);
1022                                 if (len > 0) {
1023                                         strNcpy(q, tmpdt, freespace);
1024                                         q += strlen(q);
1025                                 }
1026                                 p++;
1027                                 break;
1028                         case 'U': /* Stripped User name */
1029                                 q += valuepair2str(q,freespace,pairfind(request->packet->vps,PW_STRIPPED_USER_NAME),PW_TYPE_STRING, func);
1030                                 p++;
1031                                 break;
1032                         case 'V': /* Request-Authenticator */
1033                                 if (request->packet->verified)
1034                                         strNcpy(q,"Verified",freespace-1);
1035                                 else
1036                                         strNcpy(q,"None",freespace-1);
1037                                 q += strlen(q);
1038                                 p++;
1039                                 break;
1040                         case 'Y': /* request year */
1041                                 TM = localtime_r(&request->timestamp, &s_TM);
1042                                 len = strftime(tmpdt, sizeof(tmpdt), "%Y", TM);
1043                                 if (len > 0) {
1044                                         strNcpy(q, tmpdt, freespace);
1045                                         q += strlen(q);
1046                                 }
1047                                 p++;
1048                                 break;
1049                         case 'Z': /* Full request pairs except password */
1050                                 tmp = request->packet->vps;
1051                                 while (tmp && (freespace > 3)) {
1052                                         if (tmp->attribute != PW_PASSWORD) {
1053                                                 *q++ = '\t';
1054                                                 len = vp_prints(q, freespace - 2, tmp);
1055                                                 q += len;
1056                                                 freespace -= (len + 2);
1057                                                 *q++ = '\n';
1058                                         }
1059                                         tmp = tmp->next;
1060                                 }
1061                                 p++;
1062                                 break;
1063                         default:
1064                                 DEBUG2("WARNING: Unknown variable '%%%c': See 'doc/variables.txt'", *p);
1065                                 if (freespace > 2) {
1066                                         *q++ = '%';
1067                                         *q++ = *p++;
1068                                 }
1069                                 break;
1070                 }
1071         }
1072         *q = '\0';
1073
1074         DEBUG2("radius_xlat:  '%s'", out);
1075
1076         return strlen(out);
1077 }