dnslib.h File Reference

#include <string.h>
#include <stdint.h>
#include <sys/socket.h>
#include <arpa/inet.h>

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Data Structures
struct	dns_pkt_hdr
struct	dns_pkt_qst
struct	dns_pkt_a
struct	dns_pkt

Macros
#define	LBL_PTR_MASK   0xC0 /* Network byte order */
#define	LBL_PTR_OFF_MASK   0x3f /* N.b. order */
#define	LBL_PTR(c)   ((c)&LBL_PTR_MASK) /* AND whith 0xC000 */
#define	MAX_RECURSION_PTR   20
#define	DNS_INV_PREFIX   ".IN-ADDR.ARPA"
#define	DNS_INV_PREFIX6   ".IP6.ARPA"
#define	OLD_DNS_INV_PREFIX6   ".IP6.INT" /* For backward compatibility */
#define	T_AAAA   28 /* h->ip IPV6 */
#define	T_A   1 /* h->ip IPV4 */
#define	T_PTR   12 /* ip->h */
#define	T_MX   15 /* h->mx */
#define	DNS_RCODE_NOERR   0 /* No error */
#define	DNS_RCODE_EINTRPRT   1 /* Intepret error */
#define	DNS_RCODE_ESRVFAIL   2 /* Server failure */
#define	DNS_RCODE_ENSDMN   3 /* No such domain */
#define	DNS_RCODE_ENIMPL   4 /* Not implemented */
#define	DNS_RCODE_ERFSD   5 /* Refused */
#define	C_IN   1
#define	DNS_MAX_SZ   512
#define	DNS_HDR_SZ   12
#define	DNS_MAX_LABELS   63
#define	DNS_MAX_HNAME_LEN   255
#define	DNS_TTL   86400;
#define	min(x, y)   ((x)<(y))?(x):(y)
#define	DNS_PKT_HDR_SZ   sizeof(dns_pkt_hdr)
#define	DP_QDCOUNT(dp)   ((dp)->pkt_hdr).qdcount
#define	DP_ANCOUNT(dp)   ((dp)->pkt_hdr).ancount
#define	DP_NSCOUNT(dp)   ((dp)->pkt_hdr).nscount
#define	DP_ARCOUNT(dp)   ((dp)->pkt_hdr).arcount
#define	DNS_PKT_QST_SZ   sizeof(dns_pkt_qst)
#define	DNS_PKT_A_SZ   sizeof(dns_pkt_a)
#define	DNS_PKT_SZ   sizeof(dns_pkt)
#define	DNS_GET_ID(dp)   (dp)->pkt_hdr.id
#define	DNS_GET_QR(dp)   (dp)->pkt_hdr.qr
#define	DNS_GET_OPCODE(dp)   (dp)->pkt_hdr.opcode
#define	DNS_GET_AA(dp)   (dp)->pkt_hdr.aa
#define	DNS_GET_TC(dp)   (dp)->pkt_hdr.tc
#define	DNS_GET_RD(dp)   (dp)->pkt_hdr.rd
#define	DNS_GET_RA(dp)   (dp)->pkt_hdr.ra
#define	DNS_GET_Z(dp)   (dp)->pkt_hdr.z
#define	DNS_GET_RCODE(dp)   (dp)->pkt_hdr.rcode
#define	DNS_GET_QDCOUNT(dp)   (dp)->pkt_hdr.qdcount
#define	DNS_GET_ANCOUNT(dp)   (dp)->pkt_hdr.ancount
#define	DNS_GET_NSCOUNT(dp)   (dp)->pkt_hdr.nscount
#define	DNS_GET_ARCOUNT(dp)   (dp)->pkt_hdr.arcount
#define	DNS_SET_ID(dp, x)   (dp)->pkt_hdr.id=x
#define	DNS_SET_QR(dp, x)   (dp)->pkt_hdr.qr=x
#define	DNS_SET_OPCODE(dp, x)   (dp)->pkt_hdr.opcode=x
#define	DNS_SET_AA(dp, x)   (dp)->pkt_hdr.aa=x
#define	DNS_SET_TC(dp, x)   (dp)->pkt_hdr.tc=x
#define	DNS_SET_RD(dp, x)   (dp)->pkt_hdr.rd=x
#define	DNS_SET_RA(dp, x)   (dp)->pkt_hdr.ra=x
#define	DNS_SET_Z(dp, x)   (dp)->pkt_hdr.z=x
#define	DNS_SET_RCODE(dp, x)   (dp)->pkt_hdr.rcode=x
#define	DNS_SET_QDCOUNT(dp, x)   (dp)->pkt_hdr.qdcount=x
#define	DNS_SET_ANCOUNT(dp, x)   (dp)->pkt_hdr.ancount=x
#define	DNS_SET_NSCOUNT(dp, x)   (dp)->pkt_hdr.nscount=x
#define	DNS_SET_ARCOUNT(dp, x)   (dp)->pkt_hdr.arcount=x
#define	DP_ADD_ANSWER(dp)   dns_add_a(&((dp)->pkt_answ));DP_ANCOUNT(dp)+=1;
#define	DP_ADD_AUTH(dp)   dns_add_a(&((dp)->pkt_auth));DP_NSCOUNT(dp)+=1;
#define	DP_ADD_ADD(dp)   dns_add_a(&((dp)->pkt_add));DP_ARCOUNT(dp)+=1;

Typedefs
typedef struct dns_pkt_hdr	dns_pkt_hdr
typedef struct dns_pkt_qst	dns_pkt_qst
typedef struct dns_pkt_a	dns_pkt_a
typedef struct dns_pkt	dns_pkt

Functions
int	getlblptr (char *buf)
int	read_label_octet (const char *src, char *dst, int limit)
int	lbltoname (char *buf, char *start_pkt, char *dst, int limit)
int	swap_straddr (char *src, char *dst)
int	swap_straddr6 (char *src, char *dst)
int	rm_inv_prefix (char *src, char *dst)
int	add_inv_prefix (char *s, int family)
int	swapped_straddr (char *src, char *dst)
int	swapped_straddr_pref (char *src, char *dst, int family)
int	nametolbl (char *name, char *dst)
int	d_hdr_u (char *buf, dns_pkt_hdr *dph)
int	d_qst_u (char *start_buf, char *buf, dns_pkt *dp, int limit_len)
int	d_qsts_u (char *start_buf, char *buf, dns_pkt *dp, int limit_len)
int	d_a_u (char *start_buf, char *buf, dns_pkt_a **dpa_orig, int limit_len)
int	d_as_u (char *start_buf, char *buf, dns_pkt_a **dpa, int limit_len, int count)
int	d_u (char *buf, int pktlen, dns_pkt **dpp)
int	d_hdr_p (dns_pkt *dp, char *buf)
int	d_qst_p (dns_pkt_qst *dpq, char *buf, int limitlen)
int	d_qsts_p (dns_pkt *dp, char *buf, int limitlen)
int	d_a_p (dns_pkt_a *dpa, char *buf, int limitlen)
int	d_as_p (dns_pkt_a *dpa, char *buf, int limitlen, int count)
int	d_p (dns_pkt *dp, char *buf)
dns_pkt *	create_dns_pkt (void)
dns_pkt_qst *	create_dns_pkt_qst (void)
dns_pkt_a *	create_dns_pkt_a (void)
dns_pkt_qst *	dns_add_qst (dns_pkt *dp)
void	dns_del_last_qst (dns_pkt *dp)
dns_pkt_a *	dns_add_a (dns_pkt_a **dpa)
void	dns_a_default_fill (dns_pkt *dp, dns_pkt_a *dpa)
void	destroy_dns_pkt (dns_pkt *dp)

Macro Definition Documentation

#define C_IN   1

#define DNS_GET_AA

(

dp

)

(dp)->pkt_hdr.aa

#define DNS_GET_ANCOUNT

(

dp

)

(dp)->pkt_hdr.ancount

#define DNS_GET_ARCOUNT

(

dp

)

(dp)->pkt_hdr.arcount

#define DNS_GET_ID

(

dp

)

(dp)->pkt_hdr.id

#define DNS_GET_NSCOUNT

(

dp

)

(dp)->pkt_hdr.nscount

#define DNS_GET_OPCODE

(

dp

)

(dp)->pkt_hdr.opcode

#define DNS_GET_QDCOUNT

(

dp

)

(dp)->pkt_hdr.qdcount

#define DNS_GET_QR

(

dp

)

(dp)->pkt_hdr.qr

#define DNS_GET_RA

(

dp

)

(dp)->pkt_hdr.ra

#define DNS_GET_RCODE

(

dp

)

(dp)->pkt_hdr.rcode

#define DNS_GET_RD

(

dp

)

(dp)->pkt_hdr.rd

#define DNS_GET_TC

(

dp

)

(dp)->pkt_hdr.tc

#define DNS_GET_Z

(

dp

)

(dp)->pkt_hdr.z

#define DNS_HDR_SZ   12

#define DNS_INV_PREFIX   ".IN-ADDR.ARPA"

#define DNS_INV_PREFIX6   ".IP6.ARPA"

#define DNS_MAX_HNAME_LEN   255

#define DNS_MAX_LABELS   63

#define DNS_MAX_SZ   512

#define DNS_PKT_A_SZ   sizeof(dns_pkt_a)

#define DNS_PKT_HDR_SZ   sizeof(dns_pkt_hdr)

#define DNS_PKT_QST_SZ   sizeof(dns_pkt_qst)

#define DNS_PKT_SZ   sizeof(dns_pkt)

#define DNS_RCODE_EINTRPRT   1 /* Intepret error */

#define DNS_RCODE_ENIMPL   4 /* Not implemented */

#define DNS_RCODE_ENSDMN   3 /* No such domain */

#define DNS_RCODE_ERFSD   5 /* Refused */

#define DNS_RCODE_ESRVFAIL   2 /* Server failure */

#define DNS_RCODE_NOERR   0 /* No error */

#define DNS_SET_AA	(		dp,
			x
	)		(dp)->pkt_hdr.aa=x

#define DNS_SET_ANCOUNT	(		dp,
			x
	)		(dp)->pkt_hdr.ancount=x

#define DNS_SET_ARCOUNT	(		dp,
			x
	)		(dp)->pkt_hdr.arcount=x

#define DNS_SET_ID	(		dp,
			x
	)		(dp)->pkt_hdr.id=x

#define DNS_SET_NSCOUNT	(		dp,
			x
	)		(dp)->pkt_hdr.nscount=x

#define DNS_SET_OPCODE	(		dp,
			x
	)		(dp)->pkt_hdr.opcode=x

#define DNS_SET_QDCOUNT	(		dp,
			x
	)		(dp)->pkt_hdr.qdcount=x

#define DNS_SET_QR	(		dp,
			x
	)		(dp)->pkt_hdr.qr=x

#define DNS_SET_RA	(		dp,
			x
	)		(dp)->pkt_hdr.ra=x

#define DNS_SET_RCODE	(		dp,
			x
	)		(dp)->pkt_hdr.rcode=x

#define DNS_SET_RD	(		dp,
			x
	)		(dp)->pkt_hdr.rd=x

#define DNS_SET_TC	(		dp,
			x
	)		(dp)->pkt_hdr.tc=x

#define DNS_SET_Z	(		dp,
			x
	)		(dp)->pkt_hdr.z=x

#define DNS_TTL   86400;

#define DP_ADD_ADD

(

dp

)

dns_add_a(&((dp)->pkt_add));DP_ARCOUNT(dp)+=1;

#define DP_ADD_ANSWER

(

dp

)

dns_add_a(&((dp)->pkt_answ));DP_ANCOUNT(dp)+=1;

#define DP_ADD_AUTH

(

dp

)

dns_add_a(&((dp)->pkt_auth));DP_NSCOUNT(dp)+=1;

#define DP_ANCOUNT

(

dp

)

((dp)->pkt_hdr).ancount

#define DP_ARCOUNT

(

dp

)

((dp)->pkt_hdr).arcount

#define DP_NSCOUNT

(

dp

)

((dp)->pkt_hdr).nscount

#define DP_QDCOUNT

(

dp

)

((dp)->pkt_hdr).qdcount

#define LBL_PTR

(

c

)

((c)&LBL_PTR_MASK) /* AND whith 0xC000 */

#define LBL_PTR_MASK   0xC0 /* Network byte order */

#define LBL_PTR_OFF_MASK   0x3f /* N.b. order */

#define MAX_RECURSION_PTR   20

#define min	(		x,
			y
	)		((x)<(y))?(x):(y)

#define OLD_DNS_INV_PREFIX6   ".IP6.INT" /* For backward compatibility */

#define T_A   1 /* h->ip IPV4 */

#define T_AAAA   28 /* h->ip IPV6 */

#define T_MX   15 /* h->mx */

#define T_PTR   12 /* ip->h */

Typedef Documentation

typedef struct dns_pkt dns_pkt

typedef struct dns_pkt_a dns_pkt_a

typedef struct dns_pkt_hdr dns_pkt_hdr

typedef struct dns_pkt_qst dns_pkt_qst

Function Documentation

int add_inv_prefix	(	char *	s,
		int	family
	)

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dns_pkt* create_dns_pkt

(

void

)

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dns_pkt_a* create_dns_pkt_a

(

void

)

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dns_pkt_qst* create_dns_pkt_qst

(

void

)

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int d_a_p	(	dns_pkt_a *	dpa,
		char *	buf,
		int	limitlen
	)

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int d_a_u	(	char *	start_buf,
		char *	buf,
		dns_pkt_a **	dpa_orig,
		int	limit_len
	)

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int d_as_p	(	dns_pkt_a *	dpa,
		char *	buf,
		int	limitlen,
		int	count
	)

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int d_as_u	(	char *	start_buf,
		char *	buf,
		dns_pkt_a **	dpa,
		int	limit_len,
		int	count
	)

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int d_hdr_p	(	dns_pkt *	dp,
		char *	buf
	)

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int d_hdr_u	(	char *	buf,
		dns_pkt_hdr *	dph
	)

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int d_p	(	dns_pkt *	dp,
		char *	buf
	)

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int d_qst_p	(	dns_pkt_qst *	dpq,
		char *	buf,
		int	limitlen
	)

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int d_qst_u	(	char *	start_buf,
		char *	buf,
		dns_pkt *	dp,
		int	limit_len
	)

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int d_qsts_p	(	dns_pkt *	dp,
		char *	buf,
		int	limitlen
	)

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int d_qsts_u	(	char *	start_buf,
		char *	buf,
		dns_pkt *	dp,
		int	limit_len
	)

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int d_u	(	char *	buf,
		int	pktlen,
		dns_pkt **	dpp
	)

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void destroy_dns_pkt

(

dns_pkt *

dp

)

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void dns_a_default_fill	(	dns_pkt *	dp,
		dns_pkt_a *	dpa
	)

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dns_pkt_a* dns_add_a

(

dns_pkt_a **

dpa

)

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dns_pkt_qst* dns_add_qst

(

dns_pkt *

dp

)

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void dns_del_last_qst

(

dns_pkt *

dp

)

int getlblptr

(

char *

buf

)

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int lbltoname	(	char *	buf,
		char *	start_pkt,
		char *	dst,
		int	limit
	)

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int nametolbl	(	char *	name,
		char *	dst
	)

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int read_label_octet	(	const char *	src,
		char *	dst,
		int	limit
	)

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int rm_inv_prefix	(	char *	src,
		char *	dst
	)

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int swap_straddr	(	char *	src,
		char *	dst
	)

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int swap_straddr6	(	char *	src,
		char *	dst
	)

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int swapped_straddr	(	char *	src,
		char *	dst
	)

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int swapped_straddr_pref	(	char *	src,
		char *	dst,
		int	family
	)

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