167 lines
3.4 KiB
C
167 lines
3.4 KiB
C
#ifndef _DNS_HEAD_H
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#define _DNS_HEAD_H
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#include <arpa/inet.h>
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#include <linux/filter.h>
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#include <netdb.h>
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#include <stdint.h>
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#define QR_MASK 0x8000
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#define OPCODE_MASK 0x7800
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#define AA_MASK 0x0400
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#define TC_MASK 0x0200
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#define RD_MASK 0x0100
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#define RA_MASK 0x8000
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#define RCODE_MASK 0x000F
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typedef enum dns_section { DNS_S_QD = 0x01, DNS_S_AN = 0x02, DNS_S_NS = 0x04, DNS_S_AR = 0x08, DNS_S_ALL = 0x0f } dns_section_t;
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typedef enum dns_class { DNS_C_IN = 1, DNS_C_ANY = 255 } dns_class_t;
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typedef enum dns_type {
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DNS_T_A = 1,
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DNS_T_NS = 2,
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DNS_T_CNAME = 5,
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DNS_T_SOA = 6,
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DNS_T_PTR = 12,
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DNS_T_MX = 15,
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DNS_T_TXT = 16,
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DNS_T_AAAA = 28,
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DNS_T_SRV = 33,
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DNS_T_OPT = 41,
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DNS_T_SSHFP = 44,
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DNS_T_SPF = 99,
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DNS_T_AXFR = 252,
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DNS_T_ALL = 255
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} dns_type_t;
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typedef enum dns_opcode {
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DNS_OP_QUERY = 0,
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DNS_OP_IQUERY = 1,
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DNS_OP_STATUS = 2,
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DNS_OP_NOTIFY = 4,
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DNS_OP_UPDATE = 5,
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} dns_opcode_t; /* dns_opcode */
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typedef enum dns_rtcode {
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DNS_RC_NOERROR = 0,
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DNS_RC_FORMERR = 1,
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DNS_RC_SERVFAIL = 2,
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DNS_RC_NXDOMAIN = 3,
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DNS_RC_NOTIMP = 4,
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DNS_RC_REFUSED = 5,
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DNS_RC_YXDOMAIN = 6,
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DNS_RC_YXRRSET = 7,
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DNS_RC_NXRRSET = 8,
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DNS_RC_NOTAUTH = 9,
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DNS_RC_NOTZONE = 10,
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/* EDNS(0) extended RCODEs */
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DNS_RC_BADVERS = 16,
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} dns_rtcode_t; /* dns_rcode */
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struct dns_head {
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unsigned short id; // identification number
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unsigned short qr; /* Query/Response Flag */
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unsigned short opcode; /* Operation Code */
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unsigned short aa; /* Authoritative Answer Flag */
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unsigned short tc; /* Truncation Flag */
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unsigned short rd; /* Recursion Desired */
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unsigned short ra; /* Recursion Available */
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unsigned short rcode; /* Response Code */
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unsigned short qdcount; // number of question entries
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unsigned short ancount; // number of answer entries
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unsigned short nscount; // number of authority entries
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unsigned short nrcount; // number of addititional resource entries
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} __attribute__((packed));
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struct dns_qds {
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unsigned short type;
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unsigned short classes;
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};
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typedef uint32_t TTL;
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typedef struct dns_question_t /* RFC-1035 */
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{
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const char *name;
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dns_type_t type;
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dns_class_t class;
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} dns_question_t;
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typedef struct dns_generic_t /* RFC-1035 */
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{
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const char *name;
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dns_type_t type;
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dns_class_t class;
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TTL ttl;
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} dns_generic_t;
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typedef struct dns_a_t /* RFC-1035 */
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{
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const char *name;
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dns_type_t type;
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dns_class_t class;
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TTL ttl;
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in_addr_t address;
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} dns_a_t;
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typedef struct dns_aaaa_t /* RFC-1886 */
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{
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const char *name;
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dns_type_t type;
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dns_class_t class;
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TTL ttl;
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struct in6_addr address;
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} dns_aaaa_t;
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typedef struct dns_cname_t /* RFC-1035 */
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{
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const char *name;
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dns_type_t type;
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dns_class_t class;
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TTL ttl;
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const char *cname;
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} dns_cname_t;
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typedef struct dns_ptr_t /* RFC-1035 */
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{
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const char *name;
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dns_type_t type;
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dns_class_t class;
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TTL ttl;
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const char *ptr;
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} dns_ptr_t;
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typedef union dns_answer_t {
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dns_generic_t generic;
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dns_a_t a;
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dns_cname_t cname;
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dns_ptr_t ptr;
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dns_aaaa_t aaaa;
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} dns_answer_t;
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#define DNS_RR_QD 0
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#define DNS_RR_AN 1
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#define DNS_RR_NS 2
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#define DNS_RR_NR 3
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struct dns_rrs {
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unsigned short next;
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unsigned short len;
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unsigned char data[0];
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};
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struct dns_packet {
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struct dns_head head;
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unsigned short questions;
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unsigned short answers;
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unsigned short nameservers;
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unsigned short additional;
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int size;
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int len;
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unsigned char data[0];
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};
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int dns_decode(struct dns_packet *packet, unsigned char *data, int size);
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#endif |