This file is indexed.

/usr/include/postfix/dns.h is in postfix-dev 2.11.3-1+deb8u2.

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
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
#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

 /*
  * Compatibility with systems that lack RES_USE_DNSSEC and RES_USE_EDNS0
  */
#ifndef RES_USE_DNSSEC
#define RES_USE_DNSSEC	0
#endif
#ifndef RES_USE_EDNS0
#define RES_USE_EDNS0	0
#endif

 /*-
  * TLSA: https://tools.ietf.org/html/rfc6698#section-7.1
  * RRSIG: http://tools.ietf.org/html/rfc4034#section-3
  *
  * We don't request RRSIG, but we get it "for free" when we send the DO-bit.
  */
#ifndef T_TLSA
#define T_TLSA		52
#endif
#ifndef T_RRSIG
#define T_RRSIG		46		/* Avoid unknown RR in logs */
#endif
#ifndef T_DNAME
#define T_DNAME		39		/* [RFC6672] */
#endif

 /*
  * https://tools.ietf.org/html/rfc6698#section-7.2
  */
#define DNS_TLSA_USAGE_CA_CONSTRAINT			0
#define DNS_TLSA_USAGE_SERVICE_CERTIFICATE_CONSTRAINT	1
#define DNS_TLSA_USAGE_TRUST_ANCHOR_ASSERTION		2
#define DNS_TLSA_USAGE_DOMAIN_ISSUED_CERTIFICATE	3

 /*
  * https://tools.ietf.org/html/rfc6698#section-7.3
  */
#define DNS_TLSA_SELECTOR_FULL_CERTIFICATE	0
#define DNS_TLSA_SELECTOR_SUBJECTPUBLICKEYINFO	1

 /*
  * https://tools.ietf.org/html/rfc6698#section-7.4
  */
#define DNS_TLSA_MATCHING_TYPE_NO_HASH_USED	0
#define DNS_TLSA_MATCHING_TYPE_SHA256		1
#define DNS_TLSA_MATCHING_TYPE_SHA512		2

 /*
  * 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 int dnssec_valid;		/* DNSSEC validated */
    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_r(const char *, unsigned, unsigned, DNS_RR **,
			        VSTRING *, VSTRING *, int *);
extern int dns_lookup_rl(const char *, unsigned, DNS_RR **, VSTRING *,
			         VSTRING *, int *, int,...);
extern int dns_lookup_rv(const char *, unsigned, DNS_RR **, VSTRING *,
			         VSTRING *, int *, int, unsigned *);

#define dns_lookup(name, type, rflags, list, fqdn, why) \
    dns_lookup_r((name), (type), (rflags), (list), (fqdn), (why), (int *) 0)
#define dns_lookup_l(name, rflags, list, fqdn, why, lflags, ...) \
    dns_lookup_rl((name), (rflags), (list), (fqdn), (why), (int *) 0, \
	(lflags), __VA_ARGS__)
#define dns_lookup_v(name, rflags, list, fqdn, why, lflags, ltype) \
    dns_lookup_rv((name), (rflags), (list), (fqdn), (why), (int *) 0, \
	(lflags), (ltype))

 /*
  * 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