common/tr_filter.c

   1 /*
   2  * Copyright (c) 2012, 2013, JANET(UK)
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  *
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * 3. Neither the name of JANET(UK) nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  23  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  24  * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  25  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  26  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  27  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  29  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  30  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  31  * OF THE POSSIBILITY OF SUCH DAMAGE.
  32  *
  33  */
  34
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37 #include <string.h>
  38 #include <talloc.h>
  39 #include <assert.h>
  40
  41 #include <tr_filter.h>
  42 #include <trp_internal.h>
  43 #include <tid_internal.h>
  44 #include <tr_debug.h>
  45
  46 /* Function types for handling filter fields generally. All target values
  47  * are represented as strings in a TR_NAME.
  48  */
  49
  50 /* CMP functions return values like strcmp: 0 on match, <0 on target<val, >0 on target>val */
  51 typedef int (*TR_FILTER_FIELD_CMP)(TR_FILTER_TARGET *target, TR_NAME *val);
  52 /* get functions return TR_NAME format of the field value. Caller must free it. */
  53 typedef TR_NAME *(*TR_FILTER_FIELD_GET)(TR_FILTER_TARGET *target);
  54
  55 static TR_FILTER_TARGET *tr_filter_target_new(TALLOC_CTX *mem_ctx)
  56 {
  57   TR_FILTER_TARGET *target=talloc(mem_ctx, TR_FILTER_TARGET);
  58   if (target) {
  59     target->trp_inforec=NULL;
  60     target->trp_upd=NULL;
  61     target->tid_req=NULL;
  62   }
  63   return target;
  64 }
  65 void tr_filter_target_free(TR_FILTER_TARGET *target)
  66 {
  67   talloc_free(target);
  68 }
  69
  70 /**
  71  * Create a filter target for a TID request. Does not change the context of the request,
  72  * so this is only valid until that is freed.
  73  *
  74  * @param mem_ctx talloc context for the object
  75  * @param req TID request object
  76  * @return pointer to a TR_FILTER_TARGET structure, or null on allocation failure
  77  */
  78 TR_FILTER_TARGET *tr_filter_target_tid_req(TALLOC_CTX *mem_ctx, TID_REQ *req)
  79 {
  80   TR_FILTER_TARGET *target=tr_filter_target_new(mem_ctx);
  81   if (target)
  82     target->tid_req=req; /* borrowed, not adding to our context */
  83   return target;
  84 }
  85
  86 /**
  87  * Create a filter target for a TRP inforec. Does not change the context of the inforec or duplicate TR_NAMEs,
  88  * so this is only valid until those are freed.
  89  *
  90  * @param mem_ctx talloc context for the object
  91  * @param upd Update containing the TRP inforec
  92  * @param inforec TRP inforec
  93  * @return pointer to a TR_FILTER_TARGET structure, or null on allocation failure
  94  */
  95 TR_FILTER_TARGET *tr_filter_target_trp_inforec(TALLOC_CTX *mem_ctx, TRP_UPD *upd, TRP_INFOREC *inforec)
  96 {
  97   TR_FILTER_TARGET *target=tr_filter_target_new(mem_ctx);
  98   if (target) {
  99     target->trp_inforec = inforec; /* borrowed, not adding to our context */
 100     target->trp_upd=upd;
 101   }
 102   return target;
 103 }
 104
 105 /** Handler functions for TID RP_REALM field */
 106 static int tr_ff_cmp_tid_rp_realm(TR_FILTER_TARGET *target, TR_NAME *val)
 107 {
 108   return tr_name_cmp(tid_req_get_rp_realm(target->tid_req), val);
 109 }
 110
 111 static TR_NAME *tr_ff_get_tid_rp_realm(TR_FILTER_TARGET *target)
 112 {
 113   return tr_dup_name(tid_req_get_rp_realm(target->tid_req));
 114 }
 115
 116 /** Handler functions for TRP info_type field */
 117 static int tr_ff_cmp_trp_info_type(TR_FILTER_TARGET *target, TR_NAME *val)
 118 {
 119   TRP_INFOREC *inforec=target->trp_inforec;
 120   char *valstr=NULL;
 121   int val_type=0;
 122
 123   assert(val);
 124   assert(inforec);
 125
 126   /* nothing matches unknown */
 127   if (inforec->type==TRP_INFOREC_TYPE_UNKNOWN)
 128     return 0;
 129
 130   valstr = tr_name_strdup(val); /* get this as an official null-terminated string */
 131   val_type = trp_inforec_type_from_string(valstr);
 132   free(valstr);
 133
 134   /* we do not define an ordering of info types */
 135   return (val_type==inforec->type);
 136 }
 137
 138 static TR_NAME *tr_ff_get_trp_info_type(TR_FILTER_TARGET *target)
 139 {
 140   TRP_INFOREC *inforec=target->trp_inforec;
 141   return tr_new_name(trp_inforec_type_to_string(inforec->type));
 142 }
 143
 144 /** Handlers for TRP realm field */
 145 static int tr_ff_cmp_trp_realm(TR_FILTER_TARGET *target, TR_NAME *val)
 146 {
 147   return tr_name_cmp(trp_upd_get_realm(target->trp_upd), val);
 148 }
 149
 150 static TR_NAME *tr_ff_get_trp_realm(TR_FILTER_TARGET *target)
 151 {
 152   return tr_dup_name(trp_upd_get_realm(target->trp_upd));
 153 }
 154
 155 /** Handlers for TID realm field */
 156 static int tr_ff_cmp_tid_realm(TR_FILTER_TARGET *target, TR_NAME *val)
 157 {
 158   return tr_name_cmp(tid_req_get_realm(target->tid_req), val);
 159 }
 160
 161 static TR_NAME *tr_ff_get_tid_realm(TR_FILTER_TARGET *target)
 162 {
 163   return tr_dup_name(tid_req_get_realm(target->tid_req));
 164 }
 165
 166 /** Handlers for TRP community field */
 167 static int tr_ff_cmp_trp_comm(TR_FILTER_TARGET *target, TR_NAME *val)
 168 {
 169   return tr_name_cmp(trp_upd_get_comm(target->trp_upd), val);
 170 }
 171
 172 static TR_NAME *tr_ff_get_trp_comm(TR_FILTER_TARGET *target)
 173 {
 174   return tr_dup_name(trp_upd_get_comm(target->trp_upd));
 175 }
 176
 177 /** Handlers for TID community field */
 178 static int tr_ff_cmp_tid_comm(TR_FILTER_TARGET *target, TR_NAME *val)
 179 {
 180   return tr_name_cmp(tid_req_get_comm(target->tid_req), val);
 181 }
 182
 183 static TR_NAME *tr_ff_get_tid_comm(TR_FILTER_TARGET *target)
 184 {
 185   return tr_dup_name(tid_req_get_comm(target->tid_req));
 186 }
 187
 188 /** Handlers for TRP community_type field */
 189 static TR_NAME *tr_ff_get_trp_comm_type(TR_FILTER_TARGET *target)
 190 {
 191   TR_NAME *type=NULL;
 192
 193   switch(trp_inforec_get_comm_type(target->trp_inforec)) {
 194     case TR_COMM_APC:
 195       type=tr_new_name("apc");
 196       break;
 197     case TR_COMM_COI:
 198       type=tr_new_name("coi");
 199       break;
 200     default:
 201       type=NULL;
 202       break; /* unknown types always fail */
 203   }
 204
 205   return type;
 206 }
 207
 208 static int tr_ff_cmp_trp_comm_type(TR_FILTER_TARGET *target, TR_NAME *val)
 209 {
 210   TR_NAME *type=tr_ff_get_trp_comm_type(target);
 211   int retval=0;
 212
 213   if (type==NULL)
 214     retval=1;
 215   else {
 216     retval = tr_name_cmp(val, type);
 217     tr_free_name(type);
 218   }
 219   return retval;
 220 }
 221
 222 /** Handlers for TRP realm_role field */
 223 static TR_NAME *tr_ff_get_trp_realm_role(TR_FILTER_TARGET *target)
 224 {
 225   TR_NAME *type=NULL;
 226
 227   switch(trp_inforec_get_role(target->trp_inforec)) {
 228     case TR_ROLE_IDP:
 229       type=tr_new_name("idp");
 230       break;
 231     case TR_ROLE_RP:
 232       type=tr_new_name("rp");
 233       break;
 234     default:
 235       type=NULL;
 236       break; /* unknown types always fail */
 237   }
 238
 239   return type;
 240 }
 241
 242 static int tr_ff_cmp_trp_realm_role(TR_FILTER_TARGET *target, TR_NAME *val)
 243 {
 244   TR_NAME *type=tr_ff_get_trp_realm_role(target);
 245   int retval=0;
 246
 247   if (type==NULL)
 248     retval=1;
 249   else {
 250     retval = tr_name_cmp(val, type);
 251     tr_free_name(type);
 252   }
 253   return retval;
 254 }
 255
 256 /** Handlers for TRP apc field */
 257 /* TODO: Handle multiple APCs, not just the first */
 258 static int tr_ff_cmp_trp_apc(TR_FILTER_TARGET *target, TR_NAME *val)
 259 {
 260   return tr_name_cmp(tr_apc_get_id(trp_inforec_get_apcs(target->trp_inforec)), val);
 261 }
 262
 263 static TR_NAME *tr_ff_get_trp_apc(TR_FILTER_TARGET *target)
 264 {
 265   TR_APC *apc=trp_inforec_get_apcs(target->trp_inforec);
 266   if (apc==NULL)
 267     return NULL;
 268
 269   return tr_dup_name(tr_apc_get_id(apc));
 270 }
 271
 272 /** Handlers for TRP owner_realm field */
 273 static int tr_ff_cmp_trp_owner_realm(TR_FILTER_TARGET *target, TR_NAME *val)
 274 {
 275   return tr_name_cmp(trp_inforec_get_owner_realm(target->trp_inforec), val);
 276 }
 277
 278 static TR_NAME *tr_ff_get_trp_owner_realm(TR_FILTER_TARGET *target)
 279 {
 280   return tr_dup_name(trp_inforec_get_owner_realm(target->trp_inforec));
 281 }
 282
 283 /** Handlers for TRP trust_router field */
 284 static int tr_ff_cmp_trp_trust_router(TR_FILTER_TARGET *target, TR_NAME *val)
 285 {
 286   return tr_name_cmp(trp_inforec_get_trust_router(target->trp_inforec), val);
 287 }
 288
 289 static TR_NAME *tr_ff_get_trp_trust_router(TR_FILTER_TARGET *target)
 290 {
 291   return tr_dup_name(trp_inforec_get_trust_router(target->trp_inforec));
 292 }
 293
 294 /** Handlers for TRP owner_contact field */
 295 static int tr_ff_cmp_trp_owner_contact(TR_FILTER_TARGET *target, TR_NAME *val)
 296 {
 297   return tr_name_cmp(trp_inforec_get_owner_contact(target->trp_inforec), val);
 298 }
 299
 300 static TR_NAME *tr_ff_get_trp_owner_contact(TR_FILTER_TARGET *target)
 301 {
 302   return tr_dup_name(trp_inforec_get_owner_contact(target->trp_inforec));
 303 }
 304
 305 /** Handlers for TID req original_coi field */
 306 static int tr_ff_cmp_tid_orig_coi(TR_FILTER_TARGET *target, TR_NAME *val)
 307 {
 308   return tr_name_cmp(tid_req_get_orig_coi(target->tid_req), val);
 309 }
 310
 311 static TR_NAME *tr_ff_get_tid_orig_coi(TR_FILTER_TARGET *target)
 312 {
 313   return tr_dup_name(tid_req_get_orig_coi(target->tid_req));
 314 }
 315
 316 /**
 317  * Filter field handler table
 318  */
 319 struct tr_filter_field_entry {
 320   TR_FILTER_TYPE filter_type;
 321   const char *name;
 322   TR_FILTER_FIELD_CMP cmp;
 323   TR_FILTER_FIELD_GET get;
 324 };
 325 static struct tr_filter_field_entry tr_filter_field_table[] = {
 326     /* realm */
 327     {TR_FILTER_TYPE_TID_INBOUND, "realm", tr_ff_cmp_tid_realm, tr_ff_get_tid_realm},
 328     {TR_FILTER_TYPE_TRP_INBOUND, "realm", tr_ff_cmp_trp_realm, tr_ff_get_trp_realm},
 329     {TR_FILTER_TYPE_TRP_OUTBOUND, "realm", tr_ff_cmp_trp_realm, tr_ff_get_trp_realm},
 330
 331     /* community */
 332     {TR_FILTER_TYPE_TID_INBOUND, "comm", tr_ff_cmp_tid_comm, tr_ff_get_tid_comm},
 333     {TR_FILTER_TYPE_TRP_INBOUND, "comm", tr_ff_cmp_trp_comm, tr_ff_get_trp_comm},
 334     {TR_FILTER_TYPE_TRP_OUTBOUND, "comm", tr_ff_cmp_trp_comm, tr_ff_get_trp_comm},
 335
 336     /* community type */
 337     {TR_FILTER_TYPE_TRP_INBOUND, "comm_type", tr_ff_cmp_trp_comm_type, tr_ff_get_trp_comm_type},
 338     {TR_FILTER_TYPE_TRP_OUTBOUND, "comm_type", tr_ff_cmp_trp_comm_type, tr_ff_get_trp_comm_type},
 339
 340     /* realm role */
 341     {TR_FILTER_TYPE_TRP_INBOUND, "realm_role", tr_ff_cmp_trp_realm_role, tr_ff_get_trp_realm_role},
 342     {TR_FILTER_TYPE_TRP_OUTBOUND, "realm_role", tr_ff_cmp_trp_realm_role, tr_ff_get_trp_realm_role},
 343
 344     /* apc */
 345     {TR_FILTER_TYPE_TRP_INBOUND, "apc", tr_ff_cmp_trp_apc, tr_ff_get_trp_apc},
 346     {TR_FILTER_TYPE_TRP_OUTBOUND, "apc", tr_ff_cmp_trp_apc, tr_ff_get_trp_apc},
 347
 348     /* trust_router */
 349     {TR_FILTER_TYPE_TRP_INBOUND, "trust_router", tr_ff_cmp_trp_trust_router, tr_ff_get_trp_trust_router},
 350     {TR_FILTER_TYPE_TRP_OUTBOUND, "trust_router", tr_ff_cmp_trp_trust_router, tr_ff_get_trp_trust_router},
 351
 352     /* owner_realm */
 353     {TR_FILTER_TYPE_TRP_INBOUND, "owner_realm", tr_ff_cmp_trp_owner_realm, tr_ff_get_trp_owner_realm},
 354     {TR_FILTER_TYPE_TRP_OUTBOUND, "owner_realm", tr_ff_cmp_trp_owner_realm, tr_ff_get_trp_owner_realm},
 355
 356     /* owner_contact */
 357     {TR_FILTER_TYPE_TRP_INBOUND, "owner_contact", tr_ff_cmp_trp_owner_contact, tr_ff_get_trp_owner_contact},
 358     {TR_FILTER_TYPE_TRP_OUTBOUND, "owner_contact", tr_ff_cmp_trp_owner_contact, tr_ff_get_trp_owner_contact},
 359
 360     /* rp_realm */
 361     {TR_FILTER_TYPE_TID_INBOUND, "rp_realm", tr_ff_cmp_tid_rp_realm, tr_ff_get_tid_rp_realm},
 362
 363     /* original coi */
 364     {TR_FILTER_TYPE_TID_INBOUND, "original_coi", tr_ff_cmp_tid_orig_coi, tr_ff_get_tid_orig_coi},
 365
 366     /* info_type */
 367     {TR_FILTER_TYPE_TRP_INBOUND, "info_type", tr_ff_cmp_trp_info_type, tr_ff_get_trp_info_type},
 368     {TR_FILTER_TYPE_TRP_OUTBOUND, "info_type", tr_ff_cmp_trp_info_type, tr_ff_get_trp_info_type},
 369
 370     /* Unknown */
 371     {TR_FILTER_TYPE_UNKNOWN, NULL } /* This must be the final entry */
 372 };
 373
 374 /* TODO: support TRP metric field (requires > < comparison instead of wildcard match) */
 375
 376 static struct tr_filter_field_entry *tr_filter_field_entry(TR_FILTER_TYPE filter_type, TR_NAME *field_name)
 377 {
 378   unsigned int ii;
 379
 380   for (ii=0; tr_filter_field_table[ii].filter_type!=TR_FILTER_TYPE_UNKNOWN; ii++) {
 381     if ((tr_filter_field_table[ii].filter_type==filter_type)
 382         && (tr_name_cmp_str(field_name, tr_filter_field_table[ii].name)==0)) {
 383       return tr_filter_field_table+ii;
 384     }
 385   }
 386   return NULL;
 387 }
 388
 389 /**
 390  * Apply a filter to a target record or TID request.
 391  *
 392  * If one of the filter lines matches, out_action is set to the applicable action. If constraints
 393  * is not NULL, the constraints from the matching filter line will be added to the constraint set
 394  * *constraints, or to a new one if *constraints is NULL. In this case, TR_FILTER_MATCH will be
 395  * returned.
 396  *
 397  * If there is no match, returns TR_FILTER_NO_MATCH, out_action is undefined, and constraints
 398  * will not be changed.
 399  *
 400  * @param target Record or request to which the filter is applied
 401  * @param filt Filter to apply
 402  * @param constraints Pointer to existing set of constraints (NULL if not tracking constraints)
 403  * @param out_action Action to be carried out (output)
 404  * @return TR_FILTER_MATCH or TR_FILTER_NO_MATCH
 405  */
 406 int tr_filter_apply(TR_FILTER_TARGET *target,
 407                     TR_FILTER *filt,
 408                     TR_CONSTRAINT_SET **constraints,
 409                     TR_FILTER_ACTION *out_action)
 410 {
 411   unsigned int ii=0, jj=0;
 412   int retval=TR_FILTER_NO_MATCH;
 413
 414   /* Default action is reject */
 415   *out_action = TR_FILTER_ACTION_REJECT;
 416
 417   /* Validate filter */
 418   if ((filt==NULL) || (filt->type==TR_FILTER_TYPE_UNKNOWN))
 419     return TR_FILTER_NO_MATCH;
 420
 421   /* Step through filter lines looking for a match. If a line matches, retval
 422    * will be set to TR_FILTER_MATCH, so stop then. */
 423   for (ii=0, retval=TR_FILTER_NO_MATCH;
 424        ii<TR_MAX_FILTER_LINES;
 425        ii++) {
 426     /* skip empty lines (these shouldn't really happen) */
 427     if (filt->lines[ii]==NULL)
 428       continue;
 429
 430     /* Assume we are going to succeed. If any specs fail to match, we'll set
 431      * this to TR_FILTER_NO_MATCH. */
 432     retval=TR_FILTER_MATCH;
 433     for (jj=0; jj<TR_MAX_FILTER_SPECS; jj++) {
 434       /* skip empty specs (these shouldn't really happen either) */
 435       if (filt->lines[ii]->specs[jj]==NULL)
 436         continue;
 437
 438       if (!tr_fspec_matches(filt->lines[ii]->specs[jj], filt->type, target)) {
 439         retval=TR_FILTER_NO_MATCH; /* set this in case this is the last filter line */
 440         break; /* give up on this filter line */
 441       }
 442     }
 443
 444     if (retval==TR_FILTER_MATCH)
 445       break;
 446   }
 447
 448   if (retval==TR_FILTER_MATCH) {
 449     /* Matched line ii. Grab its action and constraints. */
 450     *out_action = filt->lines[ii]->action;
 451     if (constraints!=NULL) {
 452       /* if either constraint is missing, these are no-ops */
 453       tr_constraint_add_to_set(constraints, filt->lines[ii]->realm_cons);
 454       tr_constraint_add_to_set(constraints, filt->lines[ii]->domain_cons);
 455     }
 456   }
 457
 458   return retval;
 459 }
 460
 461 void tr_fspec_free(TR_FSPEC *fspec)
 462 {
 463   talloc_free(fspec);
 464 }
 465
 466 static int tr_fspec_destructor(void *obj)
 467 {
 468   TR_FSPEC *fspec = talloc_get_type_abort(obj, TR_FSPEC);
 469   size_t ii;
 470
 471   if (fspec->field != NULL)
 472     tr_free_name(fspec->field);
 473   for (ii=0; ii<TR_MAX_FILTER_SPEC_MATCHES; ii++) {
 474     if (fspec->match[ii] != NULL)
 475       tr_free_name(fspec->match[ii]);
 476   }
 477   return 0;
 478 }
 479
 480 TR_FSPEC *tr_fspec_new(TALLOC_CTX *mem_ctx)
 481 {
 482   TR_FSPEC *fspec = talloc(mem_ctx, TR_FSPEC);
 483   size_t ii=0;
 484
 485   if (fspec != NULL) {
 486     fspec->field = NULL;
 487     for (ii=0; ii<TR_MAX_FILTER_SPEC_MATCHES; ii++)
 488       fspec->match[ii] = NULL;
 489
 490     talloc_set_destructor((void *)fspec, tr_fspec_destructor);
 491   }
 492   return fspec;
 493 }
 494
 495 void tr_fspec_add_match(TR_FSPEC *fspec, TR_NAME *match)
 496 {
 497   size_t ii;
 498   for (ii=0; ii<TR_MAX_FILTER_SPEC_MATCHES; ii++) {
 499     if (fspec->match[ii]==NULL) {
 500       fspec->match[ii]=match;
 501       break;
 502     }
 503   }
 504   /* TODO: handle case that adding the match failed */
 505 }
 506
 507 /* returns 1 if the spec matches */
 508 int tr_fspec_matches(TR_FSPEC *fspec, TR_FILTER_TYPE ftype, TR_FILTER_TARGET *target)
 509 {
 510   struct tr_filter_field_entry *field=NULL;
 511   TR_NAME *name=NULL;
 512   int retval=0;
 513
 514   size_t ii=0;
 515
 516   if (fspec==NULL)
 517     return 0;
 518
 519   /* Look up how to handle the requested field */
 520   field = tr_filter_field_entry(ftype, fspec->field);
 521   if (field==NULL) {
 522     tr_err("tr_fspec_matches: No entry to handle field %.*s for %*s filter.",
 523            fspec->field->len, fspec->field->buf,
 524            tr_filter_type_to_string(ftype));
 525     return 0;
 526   }
 527
 528   name=field->get(target);
 529   if (name==NULL)
 530     return 0; /* if there's no value, there's no match */
 531
 532   for (ii=0; ii<TR_MAX_FILTER_SPEC_MATCHES; ii++) {
 533     if (fspec->match[ii]!=NULL) {
 534       if (tr_name_prefix_wildcard_match(name, fspec->match[ii])) {
 535         retval=1;
 536         tr_debug("tr_fspec_matches: Field %.*s value \"%.*s\" matches \"%.*s\" for %s filter.",
 537                  fspec->field->len, fspec->field->buf,
 538                  name->len, name->buf,
 539                  fspec->match[ii]->len, fspec->match[ii]->buf,
 540                  tr_filter_type_to_string(ftype));
 541         break;
 542       }
 543     }
 544   }
 545
 546   if (!retval) {
 547         tr_debug("tr_fspec_matches: Field %.*s value \"%.*s\" does not match for %s filter.",
 548                  fspec->field->len, fspec->field->buf,
 549                  name->len, name->buf,
 550                  tr_filter_type_to_string(ftype));
 551   }
 552   tr_free_name(name);
 553   return retval;
 554 }
 555
 556 void tr_fline_free(TR_FLINE *fline)
 557 {
 558   talloc_free(fline);
 559 }
 560
 561 TR_FLINE *tr_fline_new(TALLOC_CTX *mem_ctx)
 562 {
 563   TR_FLINE *fl = talloc(mem_ctx, TR_FLINE);
 564   int ii = 0;
 565
 566   if (fl != NULL) {
 567     fl->action = TR_FILTER_ACTION_UNKNOWN;
 568     fl->realm_cons = NULL;
 569     fl->domain_cons = NULL;
 570     for (ii = 0; ii < TR_MAX_FILTER_SPECS; ii++)
 571       fl->specs[ii] = NULL;
 572   }
 573   return fl;
 574 }
 575
 576 TR_FILTER *tr_filter_new(TALLOC_CTX *mem_ctx)
 577 {
 578   TR_FILTER *f = talloc(mem_ctx, TR_FILTER);
 579   int ii = 0;
 580
 581   if (f != NULL) {
 582     f->type = TR_FILTER_TYPE_UNKNOWN;
 583     for (ii = 0; ii < TR_MAX_FILTER_LINES; ii++)
 584       f->lines[ii] = NULL;
 585   }
 586   return f;
 587 }
 588
 589 void tr_filter_free(TR_FILTER *filt)
 590 {
 591   talloc_free(filt);
 592 }
 593
 594 void tr_filter_set_type(TR_FILTER *filt, TR_FILTER_TYPE type)
 595 {
 596   filt->type = type;
 597 }
 598
 599 TR_FILTER_TYPE tr_filter_get_type(TR_FILTER *filt)
 600 {
 601   return filt->type;
 602 }
 603
 604 /**
 605  * Check that a filter is valid, i.e., can be processed.
 606  *
 607  * @param filt Filter to verify
 608  * @return 1 if the filter is valid, 0 otherwise
 609  */
 610 int tr_filter_validate(TR_FILTER *filt)
 611 {
 612   size_t ii=0, jj=0, kk=0;
 613
 614   if (!filt)
 615     return 0;
 616
 617   /* check that we recognize the type */
 618   switch(filt->type) {
 619     case TR_FILTER_TYPE_TID_INBOUND:
 620     case TR_FILTER_TYPE_TRP_INBOUND:
 621     case TR_FILTER_TYPE_TRP_OUTBOUND:
 622       break;
 623
 624     default:
 625       return 0; /* if we get here, either TR_FILTER_TYPE_UNKNOWN or an invalid value was found */
 626   }
 627   for (ii=0; ii<TR_MAX_FILTER_LINES; ii++) {
 628     if (filt->lines[ii]==NULL)
 629       continue; /* an empty filter line is valid */
 630
 631     /* check that we recognize the action */
 632     switch(filt->lines[ii]->action) {
 633       case TR_FILTER_ACTION_ACCEPT:
 634       case TR_FILTER_ACTION_REJECT:
 635         break;
 636
 637       default:
 638         /* if we get here, either TR_FILTER_ACTION_UNKNOWN or an invalid value was found */
 639         return 0;
 640     }
 641
 642     for (jj=0; jj<TR_MAX_FILTER_SPECS; jj++) {
 643       if (filt->lines[ii]->specs[jj]==NULL)
 644         continue; /* an empty filter spec is valid */
 645
 646       if (!tr_filter_validate_spec_field(filt->type, filt->lines[ii]->specs[jj]))
 647         return 0;
 648
 649       /* check that at least one match is non-null */
 650       for (kk=0; kk<TR_MAX_FILTER_SPEC_MATCHES; kk++) {
 651         if (filt->lines[ii]->specs[jj]->match[kk]!=NULL)
 652           break;
 653       }
 654       if (kk==TR_MAX_FILTER_SPEC_MATCHES)
 655         return 0;
 656     }
 657   }
 658
 659   /* We ran the gauntlet. Success! */
 660   return 1;
 661 }
 662
 663 int tr_filter_validate_spec_field(TR_FILTER_TYPE ftype, TR_FSPEC *fspec)
 664 {
 665   if ((fspec==NULL) || (tr_filter_field_entry(ftype, fspec->field)==NULL))
 666     return 0; /* unknown field */
 667
 668   return 1;
 669 }
 670
 671 /**
 672  * Allocate a new filter set.
 673  *
 674  * @param mem_ctx Talloc context for the new set
 675  * @return Pointer to new set, or null on error
 676  */
 677 TR_FILTER_SET *tr_filter_set_new(TALLOC_CTX *mem_ctx)
 678 {
 679   TR_FILTER_SET *set=talloc(mem_ctx, TR_FILTER_SET);
 680   if (set!=NULL) {
 681     set->next=NULL;
 682     set->this=NULL;
 683   }
 684   return set;
 685 }
 686
 687 /**
 688  * Free a filter set
 689  *
 690  * @param fs Filter set to free
 691  */
 692 void tr_filter_set_free(TR_FILTER_SET *fs)
 693 {
 694   talloc_free(fs);
 695 }
 696
 697 /**
 698  * Find the tail of the filter set linked list.
 699  *
 700  * @param set Set to find tail of
 701  * @return Last element in the list
 702  */
 703 static TR_FILTER_SET *tr_filter_set_tail(TR_FILTER_SET *set)
 704 {
 705   while (set->next)
 706     set=set->next;
 707   return set;
 708 }
 709
 710 /**
 711  * Add new filter to filter set.
 712  *
 713  * @param set Filter set
 714  * @param new New filter to add
 715  * @return 0 on success, nonzero on error
 716  */
 717 int tr_filter_set_add(TR_FILTER_SET *set, TR_FILTER *new)
 718 {
 719   TR_FILTER_SET *tail=NULL;
 720
 721   if (set->this==NULL)
 722     tail=set;
 723   else {
 724     tail=tr_filter_set_tail(set);
 725     tail->next=tr_filter_set_new(set);
 726     if (tail->next==NULL)
 727       return 1;
 728     tail=tail->next;
 729   }
 730   tail->this=new;
 731   talloc_steal(tail, new);
 732   return 0;
 733 }
 734
 735 /**
 736  * Find a filter of a given type in the filter set. If there are multiple, returns the first one.
 737  *
 738  * @param set Filter set to search
 739  * @param type Type of filter to find
 740  * @return Borrowed pointer to the filter, or null if no filter of that type is found
 741  */
 742 TR_FILTER *tr_filter_set_get(TR_FILTER_SET *set, TR_FILTER_TYPE type)
 743 {
 744   TR_FILTER_SET *cur=set;
 745   while(cur!=NULL) {
 746     if ((cur->this != NULL) && (cur->this->type == type))
 747       return cur->this;
 748     cur=cur->next;
 749   }
 750   return NULL;
 751 }
 752
 753 TR_FILTER_TYPE filter_type[]={TR_FILTER_TYPE_TID_INBOUND,
 754                               TR_FILTER_TYPE_TRP_INBOUND,
 755                               TR_FILTER_TYPE_TRP_OUTBOUND};
 756 const char *filter_label[]={"tid_inbound",
 757                             "trp_inbound",
 758                             "trp_outbound"};
 759 size_t num_filter_types=sizeof(filter_type)/sizeof(filter_type[0]);
 760
 761 const char *tr_filter_type_to_string(TR_FILTER_TYPE ftype)
 762 {
 763   size_t ii=0;
 764
 765   for (ii=0; ii<num_filter_types; ii++) {
 766     if (ftype==filter_type[ii])
 767       return filter_label[ii];
 768   }
 769   return "unknown";
 770 }
 771
 772 TR_FILTER_TYPE tr_filter_type_from_string(const char *s)
 773 {
 774   size_t ii=0;
 775
 776   for(ii=0; ii<num_filter_types; ii++) {
 777     if (0==strcmp(s, filter_label[ii]))
 778       return filter_type[ii];
 779   }
 780   return TR_FILTER_TYPE_UNKNOWN;
 781 }
 782