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