63 lines
1.2 KiB
C
63 lines
1.2 KiB
C
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#ifndef __cs361_dns_h__
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#define __cs361_dns_h__
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#include <stdint.h>
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// Maximum buffer lengths allows
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#define BUFFER_LENGTH 512
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// Structure of the bytes for a DNS header
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typedef struct
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{
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uint16_t xid;
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uint16_t flags;
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uint16_t qdcount;
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uint16_t ancount;
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uint16_t nscount;
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uint16_t arcount;
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} dns_header_t;
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typedef struct
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{
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dns_header_t header;
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unsigned char *domain;
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uint16_t qtype;
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uint16_t qclass;
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} dns_query_t;
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typedef struct
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{
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char *domain;
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uint16_t qtype;
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uint16_t qclass;
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uint32_t ttl;
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uint16_t rdlen;
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char *rdata;
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} dns_answer_t;
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typedef struct
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{
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dns_query_t query;
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dns_answer_t *answers;
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dns_answer_t *authorities;
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dns_answer_t *additionals;
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} dns_response_t;
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// Supported record types
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#define A 1
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#define NS 2
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#define CNAME 5
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#define SOA 6
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#define PTR 12
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#define MX 15
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#define AAAA 28
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void print_dns_header (dns_header_t *);
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void print_question_section (dns_query_t *query);
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void print_answer_section (dns_answer_t *answer);
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ssize_t parse_dns_query (unsigned char *bytes, dns_query_t *query);
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ssize_t parse_dns_response (unsigned char *bytes, ssize_t query_len,
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dns_response_t *response);
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#endif
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