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
|
#pragma once
/***
This file is part of systemd.
Copyright 2014 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include "systemd-basic/macro.h"
typedef struct DnsAnswer DnsAnswer;
typedef struct DnsAnswerItem DnsAnswerItem;
#include "resolved-dns-rr.h"
/* A simple array of resource records. We keep track of the
* originating ifindex for each RR where that makes sense, so that we
* can qualify A and AAAA RRs referring to a local link with the
* right ifindex.
*
* Note that we usually encode the empty DnsAnswer object as a simple NULL. */
typedef enum DnsAnswerFlags {
DNS_ANSWER_AUTHENTICATED = 1, /* Item has been authenticated */
DNS_ANSWER_CACHEABLE = 2, /* Item is subject to caching */
DNS_ANSWER_SHARED_OWNER = 4, /* For mDNS: RRset may be owner by multiple peers */
} DnsAnswerFlags;
struct DnsAnswerItem {
DnsResourceRecord *rr;
int ifindex;
DnsAnswerFlags flags;
};
struct DnsAnswer {
unsigned n_ref;
unsigned n_rrs, n_allocated;
DnsAnswerItem items[0];
};
DnsAnswer *dns_answer_new(unsigned n);
DnsAnswer *dns_answer_ref(DnsAnswer *a);
DnsAnswer *dns_answer_unref(DnsAnswer *a);
int dns_answer_add(DnsAnswer *a, DnsResourceRecord *rr, int ifindex, DnsAnswerFlags flags);
int dns_answer_add_extend(DnsAnswer **a, DnsResourceRecord *rr, int ifindex, DnsAnswerFlags flags);
int dns_answer_add_soa(DnsAnswer *a, const char *name, uint32_t ttl, int ifindex);
int dns_answer_match_key(DnsAnswer *a, const DnsResourceKey *key, DnsAnswerFlags *combined_flags);
int dns_answer_contains_rr(DnsAnswer *a, DnsResourceRecord *rr, DnsAnswerFlags *combined_flags);
int dns_answer_contains_key(DnsAnswer *a, const DnsResourceKey *key, DnsAnswerFlags *combined_flags);
int dns_answer_contains_nsec_or_nsec3(DnsAnswer *a);
int dns_answer_contains_zone_nsec3(DnsAnswer *answer, const char *zone);
int dns_answer_find_soa(DnsAnswer *a, const DnsResourceKey *key, DnsResourceRecord **ret, DnsAnswerFlags *flags);
int dns_answer_find_cname_or_dname(DnsAnswer *a, const DnsResourceKey *key, DnsResourceRecord **ret, DnsAnswerFlags *flags);
int dns_answer_merge(DnsAnswer *a, DnsAnswer *b, DnsAnswer **ret);
int dns_answer_extend(DnsAnswer **a, DnsAnswer *b);
void dns_answer_order_by_scope(DnsAnswer *a, bool prefer_link_local);
int dns_answer_reserve(DnsAnswer **a, unsigned n_free);
int dns_answer_reserve_or_clone(DnsAnswer **a, unsigned n_free);
int dns_answer_remove_by_key(DnsAnswer **a, const DnsResourceKey *key);
int dns_answer_remove_by_rr(DnsAnswer **a, DnsResourceRecord *rr);
int dns_answer_copy_by_key(DnsAnswer **a, DnsAnswer *source, const DnsResourceKey *key, DnsAnswerFlags or_flags);
int dns_answer_move_by_key(DnsAnswer **to, DnsAnswer **from, const DnsResourceKey *key, DnsAnswerFlags or_flags);
bool dns_answer_has_dname_for_cname(DnsAnswer *a, DnsResourceRecord *cname);
static inline unsigned dns_answer_size(DnsAnswer *a) {
return a ? a->n_rrs : 0;
}
static inline bool dns_answer_isempty(DnsAnswer *a) {
return dns_answer_size(a) <= 0;
}
void dns_answer_dump(DnsAnswer *answer, FILE *f);
DEFINE_TRIVIAL_CLEANUP_FUNC(DnsAnswer*, dns_answer_unref);
#define _DNS_ANSWER_FOREACH(q, kk, a) \
for (unsigned UNIQ_T(i, q) = ({ \
(kk) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].rr : NULL; \
0; \
}); \
(a) && (UNIQ_T(i, q) < (a)->n_rrs); \
UNIQ_T(i, q)++, (kk) = (UNIQ_T(i, q) < (a)->n_rrs ? (a)->items[UNIQ_T(i, q)].rr : NULL))
#define DNS_ANSWER_FOREACH(kk, a) _DNS_ANSWER_FOREACH(UNIQ, kk, a)
#define _DNS_ANSWER_FOREACH_IFINDEX(q, kk, ifi, a) \
for (unsigned UNIQ_T(i, q) = ({ \
(kk) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].rr : NULL; \
(ifi) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].ifindex : 0; \
0; \
}); \
(a) && (UNIQ_T(i, q) < (a)->n_rrs); \
UNIQ_T(i, q)++, \
(kk) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].rr : NULL), \
(ifi) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].ifindex : 0))
#define DNS_ANSWER_FOREACH_IFINDEX(kk, ifindex, a) _DNS_ANSWER_FOREACH_IFINDEX(UNIQ, kk, ifindex, a)
#define _DNS_ANSWER_FOREACH_FLAGS(q, kk, fl, a) \
for (unsigned UNIQ_T(i, q) = ({ \
(kk) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].rr : NULL; \
(fl) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].flags : 0; \
0; \
}); \
(a) && (UNIQ_T(i, q) < (a)->n_rrs); \
UNIQ_T(i, q)++, \
(kk) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].rr : NULL), \
(fl) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].flags : 0))
#define DNS_ANSWER_FOREACH_FLAGS(kk, flags, a) _DNS_ANSWER_FOREACH_FLAGS(UNIQ, kk, flags, a)
#define _DNS_ANSWER_FOREACH_FULL(q, kk, ifi, fl, a) \
for (unsigned UNIQ_T(i, q) = ({ \
(kk) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].rr : NULL; \
(ifi) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].ifindex : 0; \
(fl) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].flags : 0; \
0; \
}); \
(a) && (UNIQ_T(i, q) < (a)->n_rrs); \
UNIQ_T(i, q)++, \
(kk) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].rr : NULL), \
(ifi) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].ifindex : 0), \
(fl) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].flags : 0))
#define DNS_ANSWER_FOREACH_FULL(kk, ifindex, flags, a) _DNS_ANSWER_FOREACH_FULL(UNIQ, kk, ifindex, flags, a)
|
