117 lines
4 KiB
C
117 lines
4 KiB
C
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/*
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* Copyright (C) 2006 Justin Karneges
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef JDNS_PACKET_H
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#define JDNS_PACKET_H
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#include "jdns.h"
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// -- howto --
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//
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// writing packets:
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// 1) call jdns_packet_new()
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// 2) populate the jdns_packet_t structure, using the functions
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// as necessary
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// 3) call jdns_packet_export() to populate the raw data of the packet
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//
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// reading packets:
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// 1) call jdns_packet_new()
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// 2) call jdns_packet_import() with the raw data
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// 3) the jdns_packet_t structure is now populated
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//
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// IMPORTANT: all names must be valid. that is, ending in a dot character
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int jdns_packet_name_isvalid(const unsigned char *name, int size); // 0 if not valid
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typedef struct jdns_packet_question
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{
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JDNS_OBJECT
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jdns_string_t *qname;
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unsigned short int qtype, qclass;
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} jdns_packet_question_t;
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jdns_packet_question_t *jdns_packet_question_new();
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jdns_packet_question_t *jdns_packet_question_copy(const jdns_packet_question_t *a);
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void jdns_packet_question_delete(jdns_packet_question_t *a);
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typedef struct jdns_packet_write jdns_packet_write_t;
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typedef struct jdns_packet jdns_packet_t;
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typedef struct jdns_packet_resource
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{
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JDNS_OBJECT
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jdns_string_t *qname;
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unsigned short int qtype, qclass;
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unsigned long int ttl;
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unsigned short int rdlength;
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unsigned char *rdata;
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// private
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jdns_list_t *writelog; // jdns_packet_write_t
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} jdns_packet_resource_t;
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jdns_packet_resource_t *jdns_packet_resource_new();
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jdns_packet_resource_t *jdns_packet_resource_copy(const jdns_packet_resource_t *a);
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void jdns_packet_resource_delete(jdns_packet_resource_t *a);
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void jdns_packet_resource_add_bytes(jdns_packet_resource_t *a, const unsigned char *data, int size);
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void jdns_packet_resource_add_name(jdns_packet_resource_t *a, const jdns_string_t *name);
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int jdns_packet_resource_read_name(const jdns_packet_resource_t *a, const jdns_packet_t *p, int *at, jdns_string_t **name);
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struct jdns_packet
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{
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JDNS_OBJECT
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unsigned short int id;
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struct
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{
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unsigned short qr, opcode, aa, tc, rd, ra, z, rcode;
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} opts;
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// item counts as specified by the packet. do not use these
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// for iteration over the item lists, since they can be wrong
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// if the packet is truncated.
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int qdcount, ancount, nscount, arcount;
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// value lists
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jdns_list_t *questions; // jdns_packet_question_t
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jdns_list_t *answerRecords; // jdns_packet_resource_t
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jdns_list_t *authorityRecords; // jdns_packet_resource_t
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jdns_list_t *additionalRecords; // jdns_packet_resource_t
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// since dns packets are allowed to be truncated, it is possible
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// for a packet to not get fully parsed yet still be considered
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// successfully parsed. this flag means the packet was fully
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// parsed also.
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int fully_parsed;
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int raw_size;
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unsigned char *raw_data;
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};
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jdns_packet_t *jdns_packet_new();
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jdns_packet_t *jdns_packet_copy(const jdns_packet_t *a);
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void jdns_packet_delete(jdns_packet_t *a);
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int jdns_packet_import(jdns_packet_t **a, const unsigned char *data, int size); // 0 on fail
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int jdns_packet_export(jdns_packet_t *a, int maxsize); // 0 on fail
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#endif
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