317 lines
12 KiB
C
317 lines
12 KiB
C
/*
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* util/data/dname.h - domain name routines
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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 functions to deal with domain names (dnames).
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*
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* Some of the functions deal with domain names as a wireformat buffer,
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* with a length.
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*/
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#ifndef UTIL_DATA_DNAME_H
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#define UTIL_DATA_DNAME_H
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#include "util/storage/lruhash.h"
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struct sldns_buffer;
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/** max number of compression ptrs to follow */
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#define MAX_COMPRESS_PTRS 256
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/**
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* Determine length of dname in buffer, no compression ptrs allowed,
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* @param query: the ldns buffer, current position at start of dname.
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* at end, position is at end of the dname.
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* @return: 0 on parse failure, or length including ending 0 of dname.
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*/
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size_t query_dname_len(struct sldns_buffer* query);
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/**
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* Determine if dname in memory is correct. no compression ptrs allowed.
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* @param dname: where dname starts in memory.
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* @param len: dname is not allowed to exceed this length (i.e. of allocation).
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* @return length of dname if dname is ok, 0 on a parse error.
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*/
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size_t dname_valid(uint8_t* dname, size_t len);
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/** lowercase query dname */
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void query_dname_tolower(uint8_t* dname);
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/**
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* lowercase pkt dname (follows compression pointers)
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* @param pkt: the packet, used to follow compression pointers. Position
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* is unchanged.
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* @param dname: start of dname in packet.
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*/
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void pkt_dname_tolower(struct sldns_buffer* pkt, uint8_t* dname);
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/**
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* Compare query dnames (uncompressed storage). The Dnames passed do not
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* have to be lowercased, comparison routine does this.
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*
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* This routine is special, in that the comparison that it does corresponds
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* with the canonical comparison needed when comparing dnames inside rdata
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* for RR types that need canonicalization. That means that the first byte
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* that is smaller (possibly after lowercasing) makes an RR smaller, or the
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* shortest name makes an RR smaller.
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*
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* This routine does not compute the canonical order needed for NSEC
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* processing.
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*
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* Dnames have to be valid format.
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* @param d1: dname to compare
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* @param d2: dname to compare
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* @return: -1, 0, or +1 depending on comparison results.
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* Sort order is first difference found. not the canonical ordering.
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*/
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int query_dname_compare(uint8_t* d1, uint8_t* d2);
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/**
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* Determine correct, compressed, dname present in packet.
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* Checks for parse errors.
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* @param pkt: packet to read from (from current start position).
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* @return: 0 on parse error.
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* At exit the position is right after the (compressed) dname.
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* Compression pointers are followed and checked for loops.
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* The uncompressed wireformat length is returned.
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*/
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size_t pkt_dname_len(struct sldns_buffer* pkt);
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/**
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* Compare dnames in packet (compressed). Dnames must be valid.
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* routine performs lowercasing, so the packet casing is preserved.
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* @param pkt: packet, used to resolve compression pointers.
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* @param d1: dname to compare
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* @param d2: dname to compare
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* @return: -1, 0, or +1 depending on comparison results.
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* Sort order is first difference found. not the canonical ordering.
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*/
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int dname_pkt_compare(struct sldns_buffer* pkt, uint8_t* d1, uint8_t* d2);
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/**
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* Hash dname, label by label, lowercasing, into hashvalue.
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* Dname in query format (not compressed).
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* @param dname: dname to hash.
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* @param h: initial hash value.
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* @return: result hash value.
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*/
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hashvalue_type dname_query_hash(uint8_t* dname, hashvalue_type h);
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/**
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* Hash dname, label by label, lowercasing, into hashvalue.
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* Dname in pkt format (compressed).
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* @param pkt: packet, for resolving compression pointers.
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* @param dname: dname to hash, pointer to the pkt buffer.
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* Must be valid format. No loops, etc.
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* @param h: initial hash value.
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* @return: result hash value.
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* Result is the same as dname_query_hash, even if compression is used.
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*/
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hashvalue_type dname_pkt_hash(struct sldns_buffer* pkt, uint8_t* dname,
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hashvalue_type h);
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/**
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* Copy over a valid dname and decompress it.
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* @param pkt: packet to resolve compression pointers.
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* @param to: buffer of size from pkt_len function to hold result.
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* @param dname: pointer into packet where dname starts.
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*/
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void dname_pkt_copy(struct sldns_buffer* pkt, uint8_t* to, uint8_t* dname);
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/**
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* Copy over a valid dname to a packet.
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* @param pkt: packet to copy to.
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* @param dname: dname to copy.
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* @return: 0 if not enough space in buffer.
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*/
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int dname_buffer_write(struct sldns_buffer* pkt, uint8_t* dname);
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/**
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* Count the number of labels in an uncompressed dname in memory.
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* @param dname: pointer to uncompressed dname.
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* @return: count of labels, including root label, "com." has 2 labels.
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*/
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int dname_count_labels(uint8_t* dname);
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/**
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* Count labels and dname length both, for uncompressed dname in memory.
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* @param dname: pointer to uncompressed dname.
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* @param size: length of dname, including root label.
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* @return: count of labels, including root label, "com." has 2 labels.
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*/
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int dname_count_size_labels(uint8_t* dname, size_t* size);
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/**
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* Compare dnames, sorted not canonical, but by label.
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* Such that zone contents follows zone apex.
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* @param d1: first dname. pointer to uncompressed wireformat.
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* @param labs1: number of labels in first dname.
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* @param d2: second dname. pointer to uncompressed wireformat.
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* @param labs2: number of labels in second dname.
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* @param mlabs: number of labels that matched exactly (the shared topdomain).
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* @return: 0 for equal, -1 smaller, or +1 d1 larger than d2.
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*/
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int dname_lab_cmp(uint8_t* d1, int labs1, uint8_t* d2, int labs2, int* mlabs);
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/**
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* Check if labels starts with given prefix
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* @param label: dname label
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* @param prefix: the string to match label with, null terminated.
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* @param endptr: pointer to location in label after prefix, only if return
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* value is 1. NULL if nothing in the label after the prefix, i.e. prefix
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* and label are the same.
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* @return: 1 if label starts with prefix, else 0
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*/
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int dname_lab_startswith(uint8_t* label, char* prefix, char** endptr);
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/**
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* See if domain name d1 is a strict subdomain of d2.
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* That is a subdomain, but not equal.
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* @param d1: domain name, uncompressed wireformat
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* @param labs1: number of labels in d1, including root label.
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* @param d2: domain name, uncompressed wireformat
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* @param labs2: number of labels in d2, including root label.
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* @return true if d1 is a subdomain of d2, but not equal to d2.
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*/
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int dname_strict_subdomain(uint8_t* d1, int labs1, uint8_t* d2, int labs2);
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/**
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* Like dname_strict_subdomain but counts labels
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* @param d1: domain name, uncompressed wireformat
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* @param d2: domain name, uncompressed wireformat
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* @return true if d1 is a subdomain of d2, but not equal to d2.
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*/
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int dname_strict_subdomain_c(uint8_t* d1, uint8_t* d2);
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/**
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* Counts labels. Tests is d1 is a subdomain of d2.
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* @param d1: domain name, uncompressed wireformat
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* @param d2: domain name, uncompressed wireformat
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* @return true if d1 is a subdomain of d2.
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*/
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int dname_subdomain_c(uint8_t* d1, uint8_t* d2);
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/**
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* Debug helper. Print wireformat dname to output.
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* @param out: like stdout or a file.
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* @param pkt: if not NULL, the packet for resolving compression ptrs.
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* @param dname: pointer to (start of) dname.
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*/
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void dname_print(FILE* out, struct sldns_buffer* pkt, uint8_t* dname);
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/**
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* Debug helper. Print dname to given string buffer (string buffer must
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* be at least 255 chars + 1 for the 0, in printable form.
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* This may lose information (? for nonprintable characters, or & if
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* the name is too long, # for a bad label length).
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* @param dname: uncompressed wireformat.
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* @param str: buffer of 255+1 length.
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*/
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void dname_str(uint8_t* dname, char* str);
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/**
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* Returns true if the uncompressed wireformat dname is the root "."
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* @param dname: the dname to check
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* @return true if ".", false if not.
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*/
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int dname_is_root(uint8_t* dname);
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/**
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* Snip off first label from a dname, returning the parent zone.
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* @param dname: from what to strip off. uncompressed wireformat.
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* @param len: length, adjusted to become less.
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* @return stripped off, or "." if input was ".".
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*/
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void dname_remove_label(uint8_t** dname, size_t* len);
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/**
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* Snip off first N labels from a dname, returning the parent zone.
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* @param dname: from what to strip off. uncompressed wireformat.
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* @param len: length, adjusted to become less.
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* @param n: number of labels to strip off (from the left).
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* if 0, nothing happens.
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* @return stripped off, or "." if input was ".".
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*/
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void dname_remove_labels(uint8_t** dname, size_t* len, int n);
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/**
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* Count labels for the RRSIG signature label field.
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* Like a normal labelcount, but "*" wildcard and "." root are not counted.
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* @param dname: valid uncompressed wireformat.
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* @return number of labels like in RRSIG; '*' and '.' are not counted.
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*/
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int dname_signame_label_count(uint8_t* dname);
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/**
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* Return true if the label is a wildcard, *.example.com.
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* @param dname: valid uncompressed wireformat.
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* @return true if wildcard, or false.
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*/
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int dname_is_wild(uint8_t* dname);
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/**
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* Compare dnames, Canonical in rfc4034 sense, but by label.
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* Such that zone contents follows zone apex.
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*
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* @param d1: first dname. pointer to uncompressed wireformat.
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* @param labs1: number of labels in first dname.
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* @param d2: second dname. pointer to uncompressed wireformat.
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* @param labs2: number of labels in second dname.
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* @param mlabs: number of labels that matched exactly (the shared topdomain).
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* @return: 0 for equal, -1 smaller, or +1 d1 larger than d2.
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*/
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int dname_canon_lab_cmp(uint8_t* d1, int labs1, uint8_t* d2, int labs2,
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int* mlabs);
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/**
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* Canonical dname compare. Takes care of counting labels.
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* Per rfc 4034 canonical order.
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*
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* @param d1: first dname. pointer to uncompressed wireformat.
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* @param d2: second dname. pointer to uncompressed wireformat.
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* @return: 0 for equal, -1 smaller, or +1 d1 larger than d2.
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*/
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int dname_canonical_compare(uint8_t* d1, uint8_t* d2);
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/**
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* Get the shared topdomain between two names. Root "." or longer.
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* @param d1: first dname. pointer to uncompressed wireformat.
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* @param d2: second dname. pointer to uncompressed wireformat.
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* @return pointer to shared topdomain. Ptr to a part of d1.
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*/
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uint8_t* dname_get_shared_topdomain(uint8_t* d1, uint8_t* d2);
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#endif /* UTIL_DATA_DNAME_H */
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