/usr/include/postfix/dns.h is in postfix-dev 2.9.1-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 | #ifndef _DNS_H_INCLUDED_
#define _DNS_H_INCLUDED_
/*++
/* NAME
/* dns 3h
/* SUMMARY
/* domain name service lookup
/* SYNOPSIS
/* #include <dns.h>
/* DESCRIPTION
/* .nf
/*
* System library.
*/
#include <netinet/in.h>
#include <arpa/nameser.h>
#ifdef RESOLVE_H_NEEDS_STDIO_H
#include <stdio.h>
#endif
#ifdef RESOLVE_H_NEEDS_NAMESER8_COMPAT_H
#include <nameser8_compat.h>
#endif
#ifdef RESOLVE_H_NEEDS_ARPA_NAMESER_COMPAT_H
#include <arpa/nameser_compat.h>
#endif
#include <resolv.h>
/*
* Name server compatibility. These undocumented macros appear in the file
* <arpa/nameser.h>, but since they are undocumented we should not count on
* their presence, and so they are included here just in case.
*/
#ifndef GETSHORT
#define GETSHORT(s, cp) { \
unsigned char *t_cp = (u_char *)(cp); \
(s) = ((unsigned)t_cp[0] << 8) \
| ((unsigned)t_cp[1]) \
; \
(cp) += 2; \
}
#define GETLONG(l, cp) { \
unsigned char *t_cp = (u_char *)(cp); \
(l) = ((unsigned)t_cp[0] << 24) \
| ((unsigned)t_cp[1] << 16) \
| ((unsigned)t_cp[2] << 8) \
| ((unsigned)t_cp[3]) \
; \
(cp) += 4; \
}
#endif
/*
* SunOS 4 needs this.
*/
#ifndef T_TXT
#define T_TXT 16
#endif
/*
* Utility library.
*/
#include <vstring.h>
#include <sock_addr.h>
#include <myaddrinfo.h>
/*
* Structure for fixed resource record data.
*/
typedef struct DNS_FIXED {
unsigned short type; /* T_A, T_CNAME, etc. */
unsigned short class; /* C_IN, etc. */
unsigned int ttl; /* always */
unsigned length; /* record length */
} DNS_FIXED;
/*
* Structure of a DNS resource record after expansion. The components are
* named after the things one can expect to find in a DNS resource record.
*/
typedef struct DNS_RR {
char *qname; /* query name, mystrdup()ed */
char *rname; /* reply name, mystrdup()ed */
unsigned short type; /* T_A, T_CNAME, etc. */
unsigned short class; /* C_IN, etc. */
unsigned int ttl; /* always */
unsigned short pref; /* T_MX only */
struct DNS_RR *next; /* linkage */
size_t data_len; /* actual data size */
char data[1]; /* actually a bunch of data */
} DNS_RR;
/*
* dns_strerror.c
*/
extern const char *dns_strerror(unsigned);
/*
* dns_strtype.c
*/
extern const char *dns_strtype(unsigned);
extern unsigned dns_type(const char *);
/*
* dns_rr.c
*/
extern DNS_RR *dns_rr_create(const char *, const char *,
ushort, ushort,
unsigned, unsigned,
const char *, size_t);
extern void dns_rr_free(DNS_RR *);
extern DNS_RR *dns_rr_copy(DNS_RR *);
extern DNS_RR *dns_rr_append(DNS_RR *, DNS_RR *);
extern DNS_RR *dns_rr_sort(DNS_RR *, int (*) (DNS_RR *, DNS_RR *));
extern int dns_rr_compare_pref_ipv6(DNS_RR *, DNS_RR *);
extern int dns_rr_compare_pref_ipv4(DNS_RR *, DNS_RR *);
extern int dns_rr_compare_pref_any(DNS_RR *, DNS_RR *);
extern int dns_rr_compare_pref(DNS_RR *, DNS_RR *);
extern DNS_RR *dns_rr_shuffle(DNS_RR *);
extern DNS_RR *dns_rr_remove(DNS_RR *, DNS_RR *);
/*
* dns_rr_to_pa.c
*/
extern const char *dns_rr_to_pa(DNS_RR *, MAI_HOSTADDR_STR *);
/*
* dns_sa_to_rr.c
*/
extern DNS_RR *dns_sa_to_rr(const char *, unsigned, struct sockaddr *);
/*
* dns_rr_to_sa.c
*/
extern int dns_rr_to_sa(DNS_RR *, unsigned, struct sockaddr *, SOCKADDR_SIZE *);
/*
* dns_rr_eq_sa.c
*/
extern int dns_rr_eq_sa(DNS_RR *, struct sockaddr *);
#ifdef HAS_IPV6
#define DNS_RR_EQ_SA(rr, sa) \
((SOCK_ADDR_IN_FAMILY(sa) == AF_INET && (rr)->type == T_A \
&& SOCK_ADDR_IN_ADDR(sa).s_addr == IN_ADDR((rr)->data).s_addr) \
|| (SOCK_ADDR_IN_FAMILY(sa) == AF_INET6 && (rr)->type == T_AAAA \
&& memcmp((char *) &(SOCK_ADDR_IN6_ADDR(sa)), \
(rr)->data, (rr)->data_len) == 0))
#else
#define DNS_RR_EQ_SA(rr, sa) \
(SOCK_ADDR_IN_FAMILY(sa) == AF_INET && (rr)->type == T_A \
&& SOCK_ADDR_IN_ADDR(sa).s_addr == IN_ADDR((rr)->data).s_addr)
#endif
/*
* dns_lookup.c
*/
extern int dns_lookup(const char *, unsigned, unsigned, DNS_RR **,
VSTRING *, VSTRING *);
extern int dns_lookup_l(const char *, unsigned, DNS_RR **, VSTRING *,
VSTRING *, int,...);
extern int dns_lookup_v(const char *, unsigned, DNS_RR **, VSTRING *,
VSTRING *, int, unsigned *);
/*
* Request flags.
*/
#define DNS_REQ_FLAG_STOP_OK (1<<0)
#define DNS_REQ_FLAG_STOP_INVAL (1<<1)
#define DNS_REQ_FLAG_NONE (0)
/*
* Status codes. Failures must have negative codes so they will not collide
* with valid counts of answer records etc.
*/
#define DNS_INVAL (-5) /* query ok, malformed reply */
#define DNS_FAIL (-4) /* query failed, don't retry */
#define DNS_NOTFOUND (-3) /* query ok, data not found */
#define DNS_RETRY (-2) /* query failed, try again */
#define DNS_RECURSE (-1) /* recursion needed */
#define DNS_OK 0 /* query succeeded */
/*
* How long can a DNS name or single text value be?
*/
#define DNS_NAME_LEN 1024
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* Wietse Venema
/* IBM T.J. Watson Research
/* P.O. Box 704
/* Yorktown Heights, NY 10598, USA
/*--*/
#endif
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