unbound/iterator/iter_scrub.h

   1 /*
   2  * iterator/iter_scrub.h - scrubbing, normalization, sanitization of DNS msgs.
   3  *
   4  * Copyright (c) 2007, NLnet Labs. All rights reserved.
   5  *
   6  * This software is open source.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * Redistributions of source code must retain the above copyright notice,
  13  * this list of conditions and the following disclaimer.
  14  *
  15  * Redistributions in binary form must reproduce the above copyright notice,
  16  * this list of conditions and the following disclaimer in the documentation
  17  * and/or other materials provided with the distribution.
  18  *
  19  * Neither the name of the NLNET LABS nor the names of its contributors may
  20  * be used to endorse or promote products derived from this software without
  21  * specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  24  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  25  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  26  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  27  * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  28  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
  29  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  30  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35
  36 /**
  37  * \file
  38  *
  39  * This file has routine(s) for cleaning up incoming DNS messages from
  40  * possible useless or malicious junk in it.
  41  */
  42
  43 #ifndef ITERATOR_ITER_SCRUB_H
  44 #define ITERATOR_ITER_SCRUB_H
  45 struct sldns_buffer;
  46 struct msg_parse;
  47 struct query_info;
  48 struct regional;
  49 struct module_env;
  50 struct iter_env;
  51
  52 /**
  53  * Cleanup the passed dns message.
  54  * @param pkt: the packet itself, for resolving name compression pointers.
  55  *      the packet buffer is unaltered.
  56  * @param msg: the parsed packet, this structure is cleaned up.
  57  * @param qinfo: the query info that was sent to the server. Checked.
  58  * @param zonename: the name of the last delegation point.
  59  *      Used to determine out of bailiwick information.
  60  * @param regional: where to allocate (new) parts of the message.
  61  * @param env: module environment with config settings and cache.
  62  * @param ie: iterator module environment data.
  63  * @return: false if the message is total waste. true if scrubbed with success.
  64  */
  65 int scrub_message(struct sldns_buffer* pkt, struct msg_parse* msg,
  66         struct query_info* qinfo, uint8_t* zonename, struct regional* regional,
  67         struct module_env* env, struct iter_env* ie);
  68
  69 #endif /* ITERATOR_ITER_SCRUB_H */