420 lines
14 KiB
C
420 lines
14 KiB
C
/*
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* iterator/iter_delegpt.h - delegation point with NS and address information.
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*
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* Copyright (c) 2007, NLnet Labs. All rights reserved.
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*
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* This software is open source.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of the NLNET LABS nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \file
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*
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* This file implements the Delegation Point. It contains a list of name servers
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* and their addresses if known.
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*/
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#ifndef ITERATOR_ITER_DELEGPT_H
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#define ITERATOR_ITER_DELEGPT_H
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#include "util/log.h"
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struct regional;
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struct delegpt_ns;
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struct delegpt_addr;
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struct dns_msg;
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struct ub_packed_rrset_key;
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struct msgreply_entry;
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/**
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* Delegation Point.
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* For a domain name, the NS rrset, and the A and AAAA records for those.
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*/
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struct delegpt {
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/** the domain name of the delegation point. */
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uint8_t* name;
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/** length of the delegation point name */
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size_t namelen;
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/** number of labels in delegation point */
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int namelabs;
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/** the nameservers, names from the NS RRset rdata. */
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struct delegpt_ns* nslist;
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/** the target addresses for delegation */
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struct delegpt_addr* target_list;
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/** the list of usable targets; subset of target_list
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* the items in this list are not part of the result list. */
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struct delegpt_addr* usable_list;
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/** the list of returned targets; subset of target_list */
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struct delegpt_addr* result_list;
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/** if true, the NS RRset was bogus. All info is bad. */
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int bogus;
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/** if true, the parent-side NS record has been applied:
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* its names have been added and their addresses can follow later.
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* Also true if the delegationpoint was created from a delegation
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* message and thus contains the parent-side-info already. */
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uint8_t has_parent_side_NS;
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/** for assertions on type of delegpt */
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uint8_t dp_type_mlc;
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/** use SSL for upstream query */
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uint8_t ssl_upstream;
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};
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/**
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* Nameservers for a delegation point.
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*/
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struct delegpt_ns {
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/** next in list */
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struct delegpt_ns* next;
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/** name of nameserver */
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uint8_t* name;
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/** length of name */
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size_t namelen;
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/**
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* If the name has been resolved. false if not queried for yet.
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* true if the A, AAAA queries have been generated.
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* marked true if those queries fail.
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* and marked true if got4 and got6 are both true.
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*/
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int resolved;
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/** if the ipv4 address is in the delegpt */
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uint8_t got4;
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/** if the ipv6 address is in the delegpt */
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uint8_t got6;
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/**
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* If the name is parent-side only and thus dispreferred.
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* Its addresses become dispreferred as well
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*/
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uint8_t lame;
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/** if the parent-side ipv4 address has been looked up (last resort).
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* Also enabled if a parent-side cache entry exists, or a parent-side
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* negative-cache entry exists. */
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uint8_t done_pside4;
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/** if the parent-side ipv6 address has been looked up (last resort).
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* Also enabled if a parent-side cache entry exists, or a parent-side
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* negative-cache entry exists. */
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uint8_t done_pside6;
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};
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/**
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* Address of target nameserver in delegation point.
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*/
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struct delegpt_addr {
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/** next delegation point in results */
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struct delegpt_addr* next_result;
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/** next delegation point in usable list */
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struct delegpt_addr* next_usable;
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/** next delegation point in all targets list */
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struct delegpt_addr* next_target;
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/** delegation point address */
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struct sockaddr_storage addr;
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/** length of addr */
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socklen_t addrlen;
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/** number of attempts for this addr */
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int attempts;
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/** rtt stored here in the selection algorithm */
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int sel_rtt;
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/** if true, the A or AAAA RR was bogus, so this address is bad.
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* Also check the dp->bogus to see if everything is bogus. */
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uint8_t bogus;
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/** if true, this address is dispreferred: it is a lame IP address */
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uint8_t lame;
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/** if the address is dnsseclame, but this cannot be cached, this
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* option is useful to mark the address dnsseclame.
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* This value is not copied in addr-copy and dp-copy. */
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uint8_t dnsseclame;
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};
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/**
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* Create new delegation point.
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* @param regional: where to allocate it.
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* @return new delegation point or NULL on error.
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*/
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struct delegpt* delegpt_create(struct regional* regional);
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/**
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* Create a copy of a delegation point.
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* @param dp: delegation point to copy.
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* @param regional: where to allocate it.
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* @return new delegation point or NULL on error.
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*/
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struct delegpt* delegpt_copy(struct delegpt* dp, struct regional* regional);
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/**
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* Set name of delegation point.
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* @param dp: delegation point.
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* @param regional: where to allocate the name copy.
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* @param name: name to use.
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* @return false on error.
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*/
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int delegpt_set_name(struct delegpt* dp, struct regional* regional,
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uint8_t* name);
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/**
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* Add a name to the delegation point.
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* @param dp: delegation point.
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* @param regional: where to allocate the info.
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* @param name: domain name in wire format.
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* @param lame: name is lame, disprefer it.
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* @return false on error.
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*/
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int delegpt_add_ns(struct delegpt* dp, struct regional* regional,
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uint8_t* name, uint8_t lame);
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/**
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* Add NS rrset; calls add_ns repeatedly.
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* @param dp: delegation point.
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* @param regional: where to allocate the info.
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* @param ns_rrset: NS rrset.
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* @param lame: rrset is lame, disprefer it.
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* @return 0 on alloc error.
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*/
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int delegpt_rrset_add_ns(struct delegpt* dp, struct regional* regional,
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struct ub_packed_rrset_key* ns_rrset, uint8_t lame);
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/**
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* Add target address to the delegation point.
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* @param dp: delegation point.
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* @param regional: where to allocate the info.
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* @param name: name for which target was found (must be in nslist).
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* This name is marked resolved.
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* @param namelen: length of name.
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* @param addr: the address.
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* @param addrlen: the length of addr.
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* @param bogus: security status for the address, pass true if bogus.
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* @param lame: address is lame.
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* @return false on error.
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*/
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int delegpt_add_target(struct delegpt* dp, struct regional* regional,
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uint8_t* name, size_t namelen, struct sockaddr_storage* addr,
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socklen_t addrlen, uint8_t bogus, uint8_t lame);
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/**
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* Add A RRset to delegpt.
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* @param dp: delegation point.
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* @param regional: where to allocate the info.
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* @param rrset: RRset A to add.
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* @param lame: rrset is lame, disprefer it.
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* @return 0 on alloc error.
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*/
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int delegpt_add_rrset_A(struct delegpt* dp, struct regional* regional,
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struct ub_packed_rrset_key* rrset, uint8_t lame);
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/**
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* Add AAAA RRset to delegpt.
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* @param dp: delegation point.
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* @param regional: where to allocate the info.
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* @param rrset: RRset AAAA to add.
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* @param lame: rrset is lame, disprefer it.
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* @return 0 on alloc error.
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*/
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int delegpt_add_rrset_AAAA(struct delegpt* dp, struct regional* regional,
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struct ub_packed_rrset_key* rrset, uint8_t lame);
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/**
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* Add any RRset to delegpt.
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* Does not check for duplicates added.
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* @param dp: delegation point.
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* @param regional: where to allocate the info.
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* @param rrset: RRset to add, NS, A, AAAA.
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* @param lame: rrset is lame, disprefer it.
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* @return 0 on alloc error.
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*/
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int delegpt_add_rrset(struct delegpt* dp, struct regional* regional,
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struct ub_packed_rrset_key* rrset, uint8_t lame);
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/**
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* Add address to the delegation point. No servername is associated or checked.
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* @param dp: delegation point.
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* @param regional: where to allocate the info.
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* @param addr: the address.
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* @param addrlen: the length of addr.
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* @param bogus: if address is bogus.
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* @param lame: if address is lame.
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* @return false on error.
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*/
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int delegpt_add_addr(struct delegpt* dp, struct regional* regional,
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struct sockaddr_storage* addr, socklen_t addrlen,
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uint8_t bogus, uint8_t lame);
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/**
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* Find NS record in name list of delegation point.
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* @param dp: delegation point.
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* @param name: name of nameserver to look for, uncompressed wireformat.
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* @param namelen: length of name.
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* @return the ns structure or NULL if not found.
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*/
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struct delegpt_ns* delegpt_find_ns(struct delegpt* dp, uint8_t* name,
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size_t namelen);
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/**
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* Find address record in total list of delegation point.
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* @param dp: delegation point.
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* @param addr: address
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* @param addrlen: length of addr
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* @return the addr structure or NULL if not found.
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*/
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struct delegpt_addr* delegpt_find_addr(struct delegpt* dp,
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struct sockaddr_storage* addr, socklen_t addrlen);
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/**
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* Print the delegation point to the log. For debugging.
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* @param v: verbosity value that is needed to emit to log.
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* @param dp: delegation point.
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*/
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void delegpt_log(enum verbosity_value v, struct delegpt* dp);
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/** count NS and number missing for logging */
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void delegpt_count_ns(struct delegpt* dp, size_t* numns, size_t* missing);
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/** count addresses, and number in result and available lists, for logging */
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void delegpt_count_addr(struct delegpt* dp, size_t* numaddr, size_t* numres,
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size_t* numavail);
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/**
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* Add all usable targets to the result list.
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* @param dp: delegation point.
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*/
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void delegpt_add_unused_targets(struct delegpt* dp);
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/**
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* Count number of missing targets. These are ns names with no resolved flag.
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* @param dp: delegation point.
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* @return number of missing targets (or 0).
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*/
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size_t delegpt_count_missing_targets(struct delegpt* dp);
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/** count total number of targets in dp */
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size_t delegpt_count_targets(struct delegpt* dp);
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/**
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* Create new delegation point from a dns message
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*
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* Note that this method does not actually test to see if the message is an
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* actual referral. It really is just checking to see if it can construct a
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* delegation point, so the message could be of some other type (some ANSWER
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* messages, some CNAME messages, generally.) Note that the resulting
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* DelegationPoint will contain targets for all "relevant" glue (i.e.,
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* address records whose ownernames match the target of one of the NS
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* records), so if policy dictates that some glue should be discarded beyond
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* that, discard it before calling this method. Note that this method will
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* find "glue" in either the ADDITIONAL section or the ANSWER section.
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*
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* @param msg: the dns message, referral.
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* @param regional: where to allocate delegation point.
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* @return new delegation point or NULL on alloc error, or if the
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* message was not appropriate.
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*/
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struct delegpt* delegpt_from_message(struct dns_msg* msg,
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struct regional* regional);
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/**
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* Add negative message to delegation point.
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* @param dp: delegation point.
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* @param msg: the message added, marks off A or AAAA from an NS entry.
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*/
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void delegpt_add_neg_msg(struct delegpt* dp, struct msgreply_entry* msg);
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/**
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* Register the fact that there is no ipv6 and thus AAAAs are not going
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* to be queried for or be useful.
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* @param dp: the delegation point. Updated to reflect no ipv6.
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*/
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void delegpt_no_ipv6(struct delegpt* dp);
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/**
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* Register the fact that there is no ipv4 and thus As are not going
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* to be queried for or be useful.
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* @param dp: the delegation point. Updated to reflect no ipv4.
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*/
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void delegpt_no_ipv4(struct delegpt* dp);
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/**
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* create malloced delegation point, with the given name
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* @param name: uncompressed wireformat of delegpt name.
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* @return NULL on alloc failure
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*/
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struct delegpt* delegpt_create_mlc(uint8_t* name);
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/**
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* free malloced delegation point.
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* @param dp: must have been created with delegpt_create_mlc, free'd.
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*/
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void delegpt_free_mlc(struct delegpt* dp);
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/**
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* Set name of delegation point.
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* @param dp: delegation point. malloced.
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* @param name: name to use.
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* @return false on error.
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*/
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int delegpt_set_name_mlc(struct delegpt* dp, uint8_t* name);
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/**
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* add a name to malloced delegation point.
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* @param dp: must have been created with delegpt_create_mlc.
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* @param name: the name to add.
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* @param lame: the name is lame, disprefer.
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* @return false on error.
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*/
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int delegpt_add_ns_mlc(struct delegpt* dp, uint8_t* name, uint8_t lame);
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/**
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* add an address to a malloced delegation point.
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* @param dp: must have been created with delegpt_create_mlc.
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* @param addr: the address.
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* @param addrlen: the length of addr.
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* @param bogus: if address is bogus.
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* @param lame: if address is lame.
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* @return false on error.
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*/
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int delegpt_add_addr_mlc(struct delegpt* dp, struct sockaddr_storage* addr,
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socklen_t addrlen, uint8_t bogus, uint8_t lame);
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/**
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* Add target address to the delegation point.
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* @param dp: must have been created with delegpt_create_mlc.
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* @param name: name for which target was found (must be in nslist).
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* This name is marked resolved.
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* @param namelen: length of name.
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* @param addr: the address.
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* @param addrlen: the length of addr.
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* @param bogus: security status for the address, pass true if bogus.
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* @param lame: address is lame.
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* @return false on error.
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*/
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int delegpt_add_target_mlc(struct delegpt* dp, uint8_t* name, size_t namelen,
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struct sockaddr_storage* addr, socklen_t addrlen, uint8_t bogus,
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uint8_t lame);
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/** get memory in use by dp */
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size_t delegpt_get_mem(struct delegpt* dp);
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#endif /* ITERATOR_ITER_DELEGPT_H */
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