#include "stralloc.h"
#include "iopause.h"
#include "taia.h"
#include "ip.h"

Include dependency graph for dns.h:

Data Structures
struct	dns_transmit

Macros
#define	DNS_NXD 0 /* NXDOMAIN, NODATA */

#define	DNS_MEM -1 /* out of memory; fatal */

#define	DNS_ERR -2 /* parsing errors and others */

#define	DNS_COM -3 /* (socket) communication errors - SERVFAIL */

#define	DNS_INT -4 /* internal errors */

#define	DNS_SOFT -5 /* DNS_ERR or DNS_COM */

#define	DNS_HARD -6 /* DNS loop problem */

#define	MSGSIZE MTUSIZE - 48 /* DNS Flag Day 2020 recommendation */

#define	MINMSGSIZE 512 /* RFC 1035 */

#define	MAXMSGSIZE 4096 /* 4069 seen with EDNS0 */

#define	MAXSEGMENT 65535 /* Max TCP buffer size */

#define	MAX_TTL 655360 /* Default TTL for static DNS objects */

#define	QUERY_MAXNS 32 /* 16 IPv4 + 16 IPv6 NS */

#define	QUERY_MAXIPLEN 512 /* QUERY_MAXNS * 16 */

#define	TCP_BACKLOG 20 /* the number of TCP connections supported simultaneously */

#define	FQDN_LEN 255 /* length of FQDN including all labels + dots */

#define	DNS_C_IN "\0\1"

#define	DNS_C_ANY "\0\377"

#define	DNS_T_A "\0\1"

#define	DNS_T_NS "\0\2"

#define	DNS_T_CNAME "\0\5"

#define	DNS_T_SOA "\0\6"

#define	DNS_T_PTR "\0\14"

#define	DNS_T_HINFO "\0\15"

#define	DNS_T_MX "\0\17"

#define	DNS_T_TXT "\0\20"

#define	DNS_T_RP "\0\21"

#define	DNS_T_SIG "\0\30"

#define	DNS_T_KEY "\0\31"

#define	DNS_T_AAAA "\0\34"

#define	DNS_T_SRV "\0\41"

#define	DNS_T_NAPTR "\0\43"

#define	DNS_T_CERT "\0\45"

#define	DNS_T_OPT "\0\51"

#define	DNS_T_DS "\0\53"

#define	DNS_T_SSHFP "\0\54"

#define	DNS_T_IPSECKEY "\0\55"

#define	DNS_T_RRSIG "\0\56"

#define	DNS_T_NSEC "\0\57"

#define	DNS_T_DNSKEY "\0\60"

#define	DNS_T_NSEC3 "\0\62"

#define	DNS_T_NSEC3PARAM "\0\63"

#define	DNS_T_TLSA "\0\64"

#define	DNS_T_HIP "\0\67"

#define	DNS_T_OPENPGPKEY "\0\75"

#define	DNS_T_SVCB "\0\100"

#define	DNS_T_HTTPS "\0\101"

#define	DNS_T_SPF "\0\143"

#define	DNS_T_AXFR "\0\374"

#define	DNS_T_ANY "\0\377"

#define	DNS_T_CAA "\1\1"

#define	LOCALHOST "localhost" /* no clear distinction IPv4/IPv6 */

#define	IP4_LOOPBACK "ip4-loopback"

#define	IP6_LOOPBACK "ip6-loopback"

#define	IP6_64PREFIX_GLOBAL "\000\144\377\233\000\000\000\000\000\000\000\000"

#define	DNS_NAME4_DOMAIN 32

#define	DNS_NAME6_DOMAIN (5*16)

Functions
void	dns_random_init (const char[128])

unsigned int	dns_random (unsigned int)

void	dns_domain_free (char **)

int	dns_domain_copy (char *, const char )

unsigned int	dns_domain_length (const char *)

int	dns_domain_equal (const char , const char )

int	dns_domain_suffix (const char , const char )

unsigned int	dns_domain_suffixpos (const char , const char )

int	dns_domain_fromdot (char *, const char , unsigned int)

int	dns_domain_todot_cat (stralloc , const char )

unsigned int	dns_packet_copy (const char , unsigned int, unsigned int, char , unsigned int)

unsigned int	dns_packet_getname (const char , unsigned int, unsigned int, char *)

unsigned int	dns_packet_skipname (const char *, unsigned int, unsigned int)

int	dns_transmit_start (struct dns_transmit , const char[QUERY_MAXIPLEN], int, const char , const char[2], const char[16])

void	dns_transmit_free (struct dns_transmit *)

void	dns_transmit_io (struct dns_transmit , iopause_fd , struct taia *)

int	dns_transmit_get (struct dns_transmit , const iopause_fd , const struct taia *)

int	dns_resolvconfip (char[QUERY_MAXIPLEN], uint32[QUERY_MAXNS])

int	dns_resolvconfrewrite (stralloc *)

int	dns_resolve (const char *, const char[2])

int	dns_name (stralloc *, const char[16])

int	dns_name_packet (stralloc , const char , unsigned int)

int	dns_txt_packet (stralloc , const char , unsigned int)

int	dns_txt (stralloc , const stralloc )

int	dns_mx_packet (stralloc , const char , unsigned int)

int	dns_mx (stralloc , const stralloc )

int	dns_ip_qualify (stralloc , stralloc , const stralloc *)

int	dns_ip4_packet (stralloc , const char , unsigned int)

int	dns_ip4 (stralloc , stralloc )

void	dns_sortip4 (char *, unsigned int)

int	dns_ip4_qualify_rules (stralloc , stralloc , const stralloc , const stralloc )

int	dns_ip4_qualify (stralloc , stralloc , const stralloc *)

int	dns_name4_domain (char *, const char[4])

int	dns_name4 (stralloc *, const char[4])

int	dns_ip6_packet (stralloc , const char , unsigned int)

int	dns_ip6 (stralloc , stralloc )

void	dns_sortip6 (char *, unsigned int)

int	dns_ip6_qualify_rules (stralloc , stralloc , const stralloc , const stralloc )

int	dns_ip6_qualify (stralloc , stralloc , const stralloc *)

int	dns_name6_domain (char *, const char[16])

int	dns_name6 (stralloc *, const char[16])

int	dns_transmit_start6 (struct dns_transmit , const char[QUERY_MAXIPLEN], int, const char , const char[2], const char[16], const uint32[QUERY_MAXNS])

unsigned int	dns_packet_edns0 (const char[12], const char *, const int, unsigned int)

unsigned int	dns_pseudo_rr (char *)

void	socketfree (struct dns_transmit *)

void	queryfree (struct dns_transmit *)

void	packetfree (struct dns_transmit *)

int	randombind (struct dns_transmit *)

int	randombind4 (struct dns_transmit *)

int	serverwantstcp (const char *, unsigned int)

int	serverfailed (const char , unsigned int, char )

int	getscopeid (const struct dns_transmit , const char )

int	firstudp (struct dns_transmit *)

int	nextudp (struct dns_transmit *)

int	firsttcp (struct dns_transmit *)

int	nexttcp (struct dns_transmit *)

Variables
int	flagdnsoptrr

struct dns_transmit	dns_resolve_tx

Macro Definition Documentation

◆ DNS_C_ANY

#define DNS_C_ANY "\0\377"

Definition at line 54 of file dns.h.

◆ DNS_C_IN

#define DNS_C_IN "\0\1"

Definition at line 53 of file dns.h.

◆ DNS_COM

#define DNS_COM -3 /* (socket) communication errors - SERVFAIL */

Definition at line 35 of file dns.h.

◆ DNS_ERR

#define DNS_ERR -2 /* parsing errors and others */

Definition at line 34 of file dns.h.

◆ DNS_HARD

#define DNS_HARD -6 /* DNS loop problem */

Definition at line 38 of file dns.h.

◆ DNS_INT

#define DNS_INT -4 /* internal errors */

Definition at line 36 of file dns.h.

◆ DNS_MEM

#define DNS_MEM -1 /* out of memory; fatal */

Definition at line 33 of file dns.h.

◆ DNS_NAME4_DOMAIN

#define DNS_NAME4_DOMAIN 32

Definition at line 168 of file dns.h.

◆ DNS_NAME6_DOMAIN

#define DNS_NAME6_DOMAIN (5*16)

Definition at line 181 of file dns.h.

◆ DNS_NXD

#define DNS_NXD 0 /* NXDOMAIN, NODATA */

Definition at line 32 of file dns.h.

◆ DNS_SOFT

#define DNS_SOFT -5 /* DNS_ERR or DNS_COM */

Definition at line 37 of file dns.h.

◆ DNS_T_A

#define DNS_T_A "\0\1"

Definition at line 56 of file dns.h.

◆ DNS_T_AAAA

#define DNS_T_AAAA "\0\34"

Definition at line 67 of file dns.h.

◆ DNS_T_ANY

#define DNS_T_ANY "\0\377"

Definition at line 87 of file dns.h.

◆ DNS_T_AXFR

#define DNS_T_AXFR "\0\374"

Definition at line 86 of file dns.h.

◆ DNS_T_CAA

#define DNS_T_CAA "\1\1"

Definition at line 88 of file dns.h.

◆ DNS_T_CERT

#define DNS_T_CERT "\0\45"

Definition at line 70 of file dns.h.

◆ DNS_T_CNAME

#define DNS_T_CNAME "\0\5"

Definition at line 58 of file dns.h.

◆ DNS_T_DNSKEY

#define DNS_T_DNSKEY "\0\60"

Definition at line 77 of file dns.h.

◆ DNS_T_DS

#define DNS_T_DS "\0\53"

Definition at line 72 of file dns.h.

◆ DNS_T_HINFO

#define DNS_T_HINFO "\0\15"

Definition at line 61 of file dns.h.

◆ DNS_T_HIP

#define DNS_T_HIP "\0\67"

Definition at line 81 of file dns.h.

◆ DNS_T_HTTPS

#define DNS_T_HTTPS "\0\101"

Definition at line 84 of file dns.h.

◆ DNS_T_IPSECKEY

#define DNS_T_IPSECKEY "\0\55"

Definition at line 74 of file dns.h.

◆ DNS_T_KEY

#define DNS_T_KEY "\0\31"

Definition at line 66 of file dns.h.

◆ DNS_T_MX

#define DNS_T_MX "\0\17"

Definition at line 62 of file dns.h.

◆ DNS_T_NAPTR

#define DNS_T_NAPTR "\0\43"

Definition at line 69 of file dns.h.

◆ DNS_T_NS

#define DNS_T_NS "\0\2"

Definition at line 57 of file dns.h.

◆ DNS_T_NSEC

#define DNS_T_NSEC "\0\57"

Definition at line 76 of file dns.h.

◆ DNS_T_NSEC3

#define DNS_T_NSEC3 "\0\62"

Definition at line 78 of file dns.h.

◆ DNS_T_NSEC3PARAM

#define DNS_T_NSEC3PARAM "\0\63"

Definition at line 79 of file dns.h.

◆ DNS_T_OPENPGPKEY

#define DNS_T_OPENPGPKEY "\0\75"

Definition at line 82 of file dns.h.

◆ DNS_T_OPT

#define DNS_T_OPT "\0\51"

Definition at line 71 of file dns.h.

◆ DNS_T_PTR

#define DNS_T_PTR "\0\14"

Definition at line 60 of file dns.h.

◆ DNS_T_RP

#define DNS_T_RP "\0\21"

Definition at line 64 of file dns.h.

◆ DNS_T_RRSIG

#define DNS_T_RRSIG "\0\56"

Definition at line 75 of file dns.h.

◆ DNS_T_SIG

#define DNS_T_SIG "\0\30"

Definition at line 65 of file dns.h.

◆ DNS_T_SOA

#define DNS_T_SOA "\0\6"

Definition at line 59 of file dns.h.

◆ DNS_T_SPF

#define DNS_T_SPF "\0\143"

Definition at line 85 of file dns.h.

◆ DNS_T_SRV

#define DNS_T_SRV "\0\41"

Definition at line 68 of file dns.h.

◆ DNS_T_SSHFP

#define DNS_T_SSHFP "\0\54"

Definition at line 73 of file dns.h.

◆ DNS_T_SVCB

#define DNS_T_SVCB "\0\100"

Definition at line 83 of file dns.h.

◆ DNS_T_TLSA

#define DNS_T_TLSA "\0\64"

Definition at line 80 of file dns.h.

◆ DNS_T_TXT

#define DNS_T_TXT "\0\20"

Definition at line 63 of file dns.h.

◆ FQDN_LEN

#define FQDN_LEN 255 /* length of FQDN including all labels + dots */

Definition at line 49 of file dns.h.

◆ IP4_LOOPBACK

#define IP4_LOOPBACK "ip4-loopback"

Definition at line 91 of file dns.h.

◆ IP6_64PREFIX_GLOBAL

#define IP6_64PREFIX_GLOBAL "\000\144\377\233\000\000\000\000\000\000\000\000"

Definition at line 93 of file dns.h.

◆ IP6_LOOPBACK

#define IP6_LOOPBACK "ip6-loopback"

Definition at line 92 of file dns.h.

◆ LOCALHOST

#define LOCALHOST "localhost" /* no clear distinction IPv4/IPv6 */

Definition at line 90 of file dns.h.

◆ MAX_TTL

#define MAX_TTL 655360 /* Default TTL for static DNS objects */

Definition at line 44 of file dns.h.

◆ MAXMSGSIZE

#define MAXMSGSIZE 4096 /* 4069 seen with EDNS0 */

Definition at line 42 of file dns.h.

◆ MAXSEGMENT

#define MAXSEGMENT 65535 /* Max TCP buffer size */

Definition at line 43 of file dns.h.

◆ MINMSGSIZE

#define MINMSGSIZE 512 /* RFC 1035 */

Definition at line 41 of file dns.h.

◆ MSGSIZE

#define MSGSIZE MTUSIZE - 48 /* DNS Flag Day 2020 recommendation */

Definition at line 40 of file dns.h.

◆ QUERY_MAXIPLEN

#define QUERY_MAXIPLEN 512 /* QUERY_MAXNS * 16 */

Definition at line 47 of file dns.h.

◆ QUERY_MAXNS

#define QUERY_MAXNS 32 /* 16 IPv4 + 16 IPv6 NS */

Definition at line 46 of file dns.h.

◆ TCP_BACKLOG

#define TCP_BACKLOG 20 /* the number of TCP connections supported simultaneously */

Definition at line 48 of file dns.h.

Function Documentation

◆ dns_domain_copy()

int dns_domain_copy	(	char **	out,
		const char *	in
	)

Definition at line 25 of file dns_domain.c.

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◆ dns_domain_equal()

int dns_domain_equal	(	const char *	dn1,
		const char *	dn2
	)

Definition at line 39 of file dns_domain.c.

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◆ dns_domain_free()

void dns_domain_free ( char ** out )

Definition at line 17 of file dns_domain.c.

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◆ dns_domain_fromdot()

int dns_domain_fromdot	(	char **	out,
		const char *	buf,
		unsigned int	n
	)

Definition at line 6 of file dns_dfd.c.

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◆ dns_domain_length()

unsigned int dns_domain_length ( const char * dn )

Definition at line 6 of file dns_domain.c.

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◆ dns_domain_suffix()

int dns_domain_suffix	(	const char *	big,
		const char *	little
	)

Definition at line 50 of file dns_domain.c.

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◆ dns_domain_suffixpos()

unsigned int dns_domain_suffixpos	(	const char *	big,
		const char *	little
	)

Definition at line 62 of file dns_domain.c.

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◆ dns_domain_todot_cat()

int dns_domain_todot_cat	(	stralloc *	out,
		const char *	d
	)

Definition at line 11 of file dns_dtda.c.

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◆ dns_ip4()

int dns_ip4	(	stralloc *	out,
		stralloc *	fqdn
	)

Definition at line 42 of file dns_ip.c.

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◆ dns_ip4_packet()

int dns_ip4_packet	(	stralloc *	out,
		const char *	buf,
		unsigned int	len
	)

Definition at line 9 of file dns_ip.c.

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◆ dns_ip4_qualify()

int dns_ip4_qualify	(	stralloc *	ipout,
		stralloc *	fqdn,
		const stralloc *	in
	)

Definition at line 109 of file dns_ipq.c.

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◆ dns_ip4_qualify_rules()

int dns_ip4_qualify_rules	(	stralloc *	ipout,
		stralloc *	fqdn,
		const stralloc *	in,
		const stralloc *	rules
	)

Definition at line 47 of file dns_ipq.c.

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◆ dns_ip6()

int dns_ip6	(	stralloc *	out,
		stralloc *	fqdn
	)

Definition at line 133 of file dns_ip.c.

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◆ dns_ip6_packet()

int dns_ip6_packet	(	stralloc *	out,
		const char *	buf,
		unsigned int	len
	)

Definition at line 93 of file dns_ip.c.

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◆ dns_ip6_qualify()

int dns_ip6_qualify	(	stralloc *	ipout,
		stralloc *	fqdn,
		const stralloc *	in
	)

Definition at line 157 of file dns_ipq.c.

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◆ dns_ip6_qualify_rules()

int dns_ip6_qualify_rules	(	stralloc *	ipout,
		stralloc *	fqdn,
		const stralloc *	in,
		const stralloc *	rules
	)

Definition at line 121 of file dns_ipq.c.

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◆ dns_ip_qualify()

int dns_ip_qualify	(	stralloc *	ipout,
		stralloc *	fqdn,
		const stralloc *	in
	)

Definition at line 228 of file dns_ipq.c.

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◆ dns_mx()

int dns_mx	(	stralloc *	out,
		const stralloc *	fqdn
	)

Definition at line 43 of file dns_mx.c.

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◆ dns_mx_packet()

int dns_mx_packet	(	stralloc *	out,
		const char *	buf,
		unsigned int	len
	)

Definition at line 8 of file dns_mx.c.

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◆ dns_name()

int dns_name	(	stralloc *	out,
		const char	ip[16]
	)

Definition at line 65 of file dns_name.c.

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◆ dns_name4()

int dns_name4	(	stralloc *	out,
		const char	ip[4]
	)

Definition at line 39 of file dns_name.c.

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◆ dns_name4_domain()

int dns_name4_domain	(	char *	,
		const char	[4]
	)

◆ dns_name6()

int dns_name6	(	stralloc *	out,
		const char	ip[16]
	)

Definition at line 52 of file dns_name.c.

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◆ dns_name6_domain()

int dns_name6_domain	(	char *	,
		const char	[16]
	)

◆ dns_name_packet()

int dns_name_packet	(	stralloc *	out,
		const char *	buf,
		unsigned int	len
	)

Definition at line 9 of file dns_name.c.

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◆ dns_packet_copy()

unsigned int dns_packet_copy	(	const char *	buf,
		unsigned int	len,
		unsigned int	pos,
		char *	out,
		unsigned int	outlen
	)

Definition at line 8 of file dns_packet.c.

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◆ dns_packet_edns0()

unsigned int dns_packet_edns0	(	const char	header[12],
		const char *	buf,
		const int	len,
		unsigned int	pos
	)

Definition at line 21 of file edns0.c.

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◆ dns_packet_getname()

unsigned int dns_packet_getname	(	const char *	buf,
		unsigned int	len,
		unsigned int	pos,
		char **	d
	)

Definition at line 35 of file dns_packet.c.

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◆ dns_packet_skipname()

unsigned int dns_packet_skipname	(	const char *	buf,
		unsigned int	len,
		unsigned int	pos
	)

Definition at line 18 of file dns_packet.c.

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◆ dns_pseudo_rr()

unsigned int dns_pseudo_rr ( char * )

◆ dns_random()

unsigned int dns_random ( unsigned int n )

Definition at line 56 of file dns_random.c.

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◆ dns_random_init()

void dns_random_init ( const char data[128] )

Definition at line 37 of file dns_random.c.

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◆ dns_resolvconfip()

int dns_resolvconfip	(	char	s[QUERY_MAXIPLEN],
		uint32	scope[QUERY_MAXNS]
	)

Definition at line 87 of file dns_rcip.c.

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◆ dns_resolvconfrewrite()

int dns_resolvconfrewrite ( stralloc * out )

Definition at line 115 of file dns_rcrw.c.

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◆ dns_resolve()

int dns_resolve	(	const char *	q,
		const char	qtype[2]
	)

Definition at line 9 of file dns_resolve.c.

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◆ dns_sortip4()

void dns_sortip4	(	char *	s,
		unsigned int	n
	)

Definition at line 10 of file dns_sortip.c.

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◆ dns_sortip6()

void dns_sortip6	(	char *	s,
		unsigned int	n
	)

Definition at line 25 of file dns_sortip.c.

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◆ dns_transmit_free()

void dns_transmit_free ( struct dns_transmit * d )

Definition at line 95 of file dns_transmit.c.

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◆ dns_transmit_get()

int dns_transmit_get	(	struct dns_transmit *	d,
		const iopause_fd *	x,
		const struct taia *	when
	)

Definition at line 296 of file dns_transmit.c.

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◆ dns_transmit_io()

void dns_transmit_io	(	struct dns_transmit *	d,
		iopause_fd *	x,
		struct taia *	deadline
	)

Definition at line 279 of file dns_transmit.c.

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◆ dns_transmit_start()

int dns_transmit_start	(	struct dns_transmit *	d,
		const char	servers[QUERY_MAXIPLEN],
		int	flagrecursive,
		const char *	q,
		const char	qtype[2],
		const char	localip[16]
	)

Definition at line 264 of file dns_transmit.c.

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◆ dns_transmit_start6()

int dns_transmit_start6	(	struct dns_transmit *	d,
		const char	servers[QUERY_MAXIPLEN],
		int	flagrecursive,
		const char *	q,
		const char	qtype[2],
		const char	localip[16],
		const	uint32[QUERY_MAXNS]
	)