440 lines
15 KiB
C
440 lines
15 KiB
C
/*
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* util/data/msgreply.h - store message and reply data.
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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 contains a data structure to store a message and its reply.
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*/
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#ifndef UTIL_DATA_MSGREPLY_H
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#define UTIL_DATA_MSGREPLY_H
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#include "util/storage/lruhash.h"
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#include "util/data/packed_rrset.h"
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struct sldns_buffer;
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struct comm_reply;
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struct alloc_cache;
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struct iovec;
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struct regional;
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struct edns_data;
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struct msg_parse;
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struct rrset_parse;
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/** calculate the prefetch TTL as 90% of original. Calculation
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* without numerical overflow (uin32_t) */
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#define PREFETCH_TTL_CALC(ttl) ((ttl) - (ttl)/10)
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/**
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* Structure to store query information that makes answers to queries
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* different.
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*/
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struct query_info {
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/**
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* Salient data on the query: qname, in wireformat.
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* can be allocated or a pointer to outside buffer.
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* User has to keep track on the status of this.
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*/
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uint8_t* qname;
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/** length of qname (including last 0 octet) */
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size_t qname_len;
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/** qtype, host byte order */
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uint16_t qtype;
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/** qclass, host byte order */
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uint16_t qclass;
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};
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/**
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* Information to reference an rrset
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*/
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struct rrset_ref {
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/** the key with lock, and ptr to packed data. */
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struct ub_packed_rrset_key* key;
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/** id needed */
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rrset_id_t id;
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};
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/**
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* Structure to store DNS query and the reply packet.
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* To use it, copy over the flags from reply and modify using flags from
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* the query (RD,CD if not AA). prepend ID.
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*
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* Memory layout is:
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* o struct
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* o rrset_ref array
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* o packed_rrset_key* array.
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*
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* Memory layout is sometimes not packed, when the message is synthesized,
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* for easy of the generation. It is allocated packed when it is copied
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* from the region allocation to the malloc allocation.
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*/
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struct reply_info {
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/** the flags for the answer, host byte order. */
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uint16_t flags;
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/**
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* This flag informs unbound the answer is authoritative and
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* the AA flag should be preserved.
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*/
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uint8_t authoritative;
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/**
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* Number of RRs in the query section.
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* If qdcount is not 0, then it is 1, and the data that appears
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* in the reply is the same as the query_info.
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* Host byte order.
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*/
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uint8_t qdcount;
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/** 32 bit padding to pad struct member alignment to 64 bits. */
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uint32_t padding;
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/**
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* TTL of the entire reply (for negative caching).
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* only for use when there are 0 RRsets in this message.
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* if there are RRsets, check those instead.
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*/
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time_t ttl;
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/**
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* TTL for prefetch. After it has expired, a prefetch is suitable.
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* Smaller than the TTL, otherwise the prefetch would not happen.
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*/
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time_t prefetch_ttl;
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/**
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* The security status from DNSSEC validation of this message.
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*/
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enum sec_status security;
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/**
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* Number of RRsets in each section.
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* The answer section. Add up the RRs in every RRset to calculate
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* the number of RRs, and the count for the dns packet.
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* The number of RRs in RRsets can change due to RRset updates.
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*/
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size_t an_numrrsets;
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/** Count of authority section RRsets */
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size_t ns_numrrsets;
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/** Count of additional section RRsets */
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size_t ar_numrrsets;
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/** number of RRsets: an_numrrsets + ns_numrrsets + ar_numrrsets */
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size_t rrset_count;
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/**
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* List of pointers (only) to the rrsets in the order in which
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* they appear in the reply message.
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* Number of elements is ancount+nscount+arcount RRsets.
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* This is a pointer to that array.
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* Use the accessor function for access.
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*/
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struct ub_packed_rrset_key** rrsets;
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/**
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* Packed array of ids (see counts) and pointers to packed_rrset_key.
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* The number equals ancount+nscount+arcount RRsets.
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* These are sorted in ascending pointer, the locking order. So
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* this list can be locked (and id, ttl checked), to see if
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* all the data is available and recent enough.
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*
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* This is defined as an array of size 1, so that the compiler
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* associates the identifier with this position in the structure.
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* Array bound overflow on this array then gives access to the further
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* elements of the array, which are allocated after the main structure.
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*
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* It could be more pure to define as array of size 0, ref[0].
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* But ref[1] may be less confusing for compilers.
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* Use the accessor function for access.
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*/
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struct rrset_ref ref[1];
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};
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/**
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* Structure to keep hash table entry for message replies.
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*/
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struct msgreply_entry {
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/** the hash table key */
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struct query_info key;
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/** the hash table entry, data is struct reply_info* */
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struct lruhash_entry entry;
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};
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/**
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* Constructor for replyinfo.
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* @param region: where to allocate the results, pass NULL to use malloc.
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* @param flags: flags for the replyinfo.
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* @param qd: qd count
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* @param ttl: TTL of replyinfo
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* @param prettl: prefetch ttl
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* @param an: an count
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* @param ns: ns count
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* @param ar: ar count
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* @param total: total rrset count (presumably an+ns+ar).
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* @param sec: security status of the reply info.
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* @return the reply_info base struct with the array for putting the rrsets
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* in. The array has been zeroed. Returns NULL on malloc failure.
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*/
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struct reply_info*
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construct_reply_info_base(struct regional* region, uint16_t flags, size_t qd,
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time_t ttl, time_t prettl, size_t an, size_t ns, size_t ar,
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size_t total, enum sec_status sec);
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/**
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* Parse wire query into a queryinfo structure, return 0 on parse error.
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* initialises the (prealloced) queryinfo structure as well.
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* This query structure contains a pointer back info the buffer!
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* This pointer avoids memory allocation. allocqname does memory allocation.
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* @param m: the prealloced queryinfo structure to put query into.
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* must be unused, or _clear()ed.
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* @param query: the wireformat packet query. starts with ID.
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* @return: 0 on format error.
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*/
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int query_info_parse(struct query_info* m, struct sldns_buffer* query);
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/**
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* Parse query reply.
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* Fills in preallocated query_info structure (with ptr into buffer).
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* Allocates reply_info and packed_rrsets. These are not yet added to any
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* caches or anything, this is only parsing. Returns formerror on qdcount > 1.
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* @param pkt: the packet buffer. Must be positioned after the query section.
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* @param alloc: creates packed rrset key structures.
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* @param rep: allocated reply_info is returned (only on no error).
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* @param qinf: query_info is returned (only on no error).
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* @param region: where to store temporary data (for parsing).
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* @param edns: where to store edns information, does not need to be inited.
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* @return: zero is OK, or DNS error code in case of error
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* o FORMERR for parse errors.
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* o SERVFAIL for memory allocation errors.
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*/
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int reply_info_parse(struct sldns_buffer* pkt, struct alloc_cache* alloc,
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struct query_info* qinf, struct reply_info** rep,
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struct regional* region, struct edns_data* edns);
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/**
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* Allocate and decompress parsed message and rrsets.
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* @param pkt: for name decompression.
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* @param msg: parsed message in scratch region.
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* @param alloc: alloc cache for special rrset key structures.
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* Not used if region!=NULL, it can be NULL in that case.
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* @param qinf: where to store query info.
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* qinf itself is allocated by the caller.
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* @param rep: reply info is allocated and returned.
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* @param region: if this parameter is NULL then malloc and the alloc is used.
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* otherwise, everything is allocated in this region.
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* In a region, no special rrset key structures are needed (not shared),
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* and no rrset_ref array in the reply is built up.
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* @return 0 if allocation failed.
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*/
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int parse_create_msg(struct sldns_buffer* pkt, struct msg_parse* msg,
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struct alloc_cache* alloc, struct query_info* qinf,
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struct reply_info** rep, struct regional* region);
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/**
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* Sorts the ref array.
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* @param rep: reply info. rrsets must be filled in.
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*/
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void reply_info_sortref(struct reply_info* rep);
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/**
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* Set TTLs inside the replyinfo to absolute values.
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* @param rep: reply info. rrsets must be filled in.
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* Also refs must be filled in.
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* @param timenow: the current time.
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*/
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void reply_info_set_ttls(struct reply_info* rep, time_t timenow);
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/**
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* Delete reply_info and packed_rrsets (while they are not yet added to the
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* hashtables.). Returns rrsets to the alloc cache.
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* @param rep: reply_info to delete.
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* @param alloc: where to return rrset structures to.
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*/
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void reply_info_parsedelete(struct reply_info* rep, struct alloc_cache* alloc);
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/**
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* Compare two queryinfo structures, on query and type, class.
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* It is _not_ sorted in canonical ordering.
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* @param m1: struct query_info* , void* here to ease use as function pointer.
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* @param m2: struct query_info* , void* here to ease use as function pointer.
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* @return: 0 = same, -1 m1 is smaller, +1 m1 is larger.
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*/
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int query_info_compare(void* m1, void* m2);
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/** clear out query info structure */
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void query_info_clear(struct query_info* m);
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/** calculate size of struct query_info + reply_info */
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size_t msgreply_sizefunc(void* k, void* d);
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/** delete msgreply_entry key structure */
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void query_entry_delete(void *q, void* arg);
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/** delete reply_info data structure */
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void reply_info_delete(void* d, void* arg);
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/** calculate hash value of query_info, lowercases the qname,
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* uses CD flag for AAAA qtype */
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hashvalue_t query_info_hash(struct query_info *q, uint16_t flags);
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/**
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* Setup query info entry
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* @param q: query info to copy. Emptied as if clear is called.
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* @param r: reply to init data.
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* @param h: hash value.
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* @return: newly allocated message reply cache item.
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*/
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struct msgreply_entry* query_info_entrysetup(struct query_info* q,
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struct reply_info* r, hashvalue_t h);
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/**
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* Copy reply_info and all rrsets in it and allocate.
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* @param rep: what to copy, probably inside region, no ref[] array in it.
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* @param alloc: how to allocate rrset keys.
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* Not used if region!=NULL, it can be NULL in that case.
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* @param region: if this parameter is NULL then malloc and the alloc is used.
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* otherwise, everything is allocated in this region.
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* In a region, no special rrset key structures are needed (not shared),
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* and no rrset_ref array in the reply is built up.
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* @return new reply info or NULL on memory error.
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*/
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struct reply_info* reply_info_copy(struct reply_info* rep,
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struct alloc_cache* alloc, struct regional* region);
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/**
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* Copy a parsed rrset into given key, decompressing and allocating rdata.
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* @param pkt: packet for decompression
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* @param msg: the parser message (for flags for trust).
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* @param pset: the parsed rrset to copy.
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* @param region: if NULL - malloc, else data is allocated in this region.
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* @param pk: a freshly obtained rrsetkey structure. No dname is set yet,
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* will be set on return.
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* Note that TTL will still be relative on return.
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* @return false on alloc failure.
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*/
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int parse_copy_decompress_rrset(struct sldns_buffer* pkt, struct msg_parse* msg,
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struct rrset_parse *pset, struct regional* region,
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struct ub_packed_rrset_key* pk);
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/**
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* Find final cname target in reply, the one matching qinfo. Follows CNAMEs.
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* @param qinfo: what to start with.
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* @param rep: looks in answer section of this message.
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* @return: pointer dname, or NULL if not found.
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*/
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uint8_t* reply_find_final_cname_target(struct query_info* qinfo,
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struct reply_info* rep);
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/**
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* Check if cname chain in cached reply is still valid.
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* @param rep: reply to check.
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* @return: true if valid, false if invalid.
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*/
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int reply_check_cname_chain(struct reply_info* rep);
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/**
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* Check security status of all RRs in the message.
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* @param rep: reply to check
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* @return: true if all RRs are secure. False if not.
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* True if there are zero RRs.
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*/
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int reply_all_rrsets_secure(struct reply_info* rep);
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/**
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* Find answer rrset in reply, the one matching qinfo. Follows CNAMEs, so the
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* result may have a different owner name.
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* @param qinfo: what to look for.
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* @param rep: looks in answer section of this message.
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* @return: pointer to rrset, or NULL if not found.
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*/
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struct ub_packed_rrset_key* reply_find_answer_rrset(struct query_info* qinfo,
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struct reply_info* rep);
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/**
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* Find rrset in reply, inside the answer section. Does not follow CNAMEs.
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* @param rep: looks in answer section of this message.
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* @param name: what to look for.
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* @param namelen: length of name.
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* @param type: looks for (host order).
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* @param dclass: looks for (host order).
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* @return: pointer to rrset, or NULL if not found.
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*/
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struct ub_packed_rrset_key* reply_find_rrset_section_an(struct reply_info* rep,
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uint8_t* name, size_t namelen, uint16_t type, uint16_t dclass);
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/**
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* Find rrset in reply, inside the authority section. Does not follow CNAMEs.
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* @param rep: looks in authority section of this message.
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* @param name: what to look for.
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* @param namelen: length of name.
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* @param type: looks for (host order).
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* @param dclass: looks for (host order).
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* @return: pointer to rrset, or NULL if not found.
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*/
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struct ub_packed_rrset_key* reply_find_rrset_section_ns(struct reply_info* rep,
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uint8_t* name, size_t namelen, uint16_t type, uint16_t dclass);
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/**
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* Find rrset in reply, inside any section. Does not follow CNAMEs.
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* @param rep: looks in answer,authority and additional section of this message.
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* @param name: what to look for.
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* @param namelen: length of name.
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* @param type: looks for (host order).
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* @param dclass: looks for (host order).
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* @return: pointer to rrset, or NULL if not found.
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*/
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struct ub_packed_rrset_key* reply_find_rrset(struct reply_info* rep,
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uint8_t* name, size_t namelen, uint16_t type, uint16_t dclass);
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/**
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* Debug send the query info and reply info to the log in readable form.
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* @param str: descriptive string printed with packet content.
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* @param qinfo: query section.
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* @param rep: rest of message.
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*/
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void log_dns_msg(const char* str, struct query_info* qinfo,
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struct reply_info* rep);
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/**
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* Print string with neat domain name, type, class from query info.
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* @param v: at what verbosity level to print this.
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* @param str: string of message.
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* @param qinf: query info structure with name, type and class.
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*/
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void log_query_info(enum verbosity_value v, const char* str,
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struct query_info* qinf);
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#endif /* UTIL_DATA_MSGREPLY_H */
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