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faa133f3 LP |
1 | #pragma once |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2014 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | typedef struct DnsAnswer DnsAnswer; | |
78c6a153 | 23 | typedef struct DnsAnswerItem DnsAnswerItem; |
faa133f3 | 24 | |
92aea95e | 25 | #include "macro.h" |
faa133f3 LP |
26 | #include "resolved-dns-rr.h" |
27 | ||
78c6a153 LP |
28 | /* A simple array of resource records. We keep track of the |
29 | * originating ifindex for each RR where that makes sense, so that we | |
30 | * can qualify A and AAAA RRs referring to a local link with the | |
547973de LP |
31 | * right ifindex. |
32 | * | |
c629ff58 | 33 | * Note that we usually encode the empty DnsAnswer object as a simple NULL. */ |
105e1512 LP |
34 | |
35 | typedef enum DnsAnswerFlags { | |
d2579eec LP |
36 | DNS_ANSWER_AUTHENTICATED = 1, /* Item has been authenticated */ |
37 | DNS_ANSWER_CACHEABLE = 2, /* Item is subject to caching */ | |
38 | DNS_ANSWER_SHARED_OWNER = 4, /* For mDNS: RRset may be owner by multiple peers */ | |
58ab31d5 | 39 | DNS_ANSWER_CACHE_FLUSH = 8, /* For mDNS: sets cache-flush bit in the rrclass of response records */ |
105e1512 | 40 | } DnsAnswerFlags; |
78c6a153 LP |
41 | |
42 | struct DnsAnswerItem { | |
43 | DnsResourceRecord *rr; | |
44 | int ifindex; | |
105e1512 | 45 | DnsAnswerFlags flags; |
78c6a153 | 46 | }; |
faa133f3 LP |
47 | |
48 | struct DnsAnswer { | |
49 | unsigned n_ref; | |
50 | unsigned n_rrs, n_allocated; | |
78c6a153 | 51 | DnsAnswerItem items[0]; |
faa133f3 LP |
52 | }; |
53 | ||
54 | DnsAnswer *dns_answer_new(unsigned n); | |
55 | DnsAnswer *dns_answer_ref(DnsAnswer *a); | |
56 | DnsAnswer *dns_answer_unref(DnsAnswer *a); | |
57 | ||
105e1512 LP |
58 | int dns_answer_add(DnsAnswer *a, DnsResourceRecord *rr, int ifindex, DnsAnswerFlags flags); |
59 | int dns_answer_add_extend(DnsAnswer **a, DnsResourceRecord *rr, int ifindex, DnsAnswerFlags flags); | |
97ebebbc | 60 | int dns_answer_add_soa(DnsAnswer *a, const char *name, uint32_t ttl, int ifindex); |
faa133f3 | 61 | |
105e1512 LP |
62 | int dns_answer_match_key(DnsAnswer *a, const DnsResourceKey *key, DnsAnswerFlags *combined_flags); |
63 | int dns_answer_contains_rr(DnsAnswer *a, DnsResourceRecord *rr, DnsAnswerFlags *combined_flags); | |
64 | int dns_answer_contains_key(DnsAnswer *a, const DnsResourceKey *key, DnsAnswerFlags *combined_flags); | |
65 | int dns_answer_contains_nsec_or_nsec3(DnsAnswer *a); | |
e926785a | 66 | int dns_answer_contains_zone_nsec3(DnsAnswer *answer, const char *zone); |
547973de | 67 | |
fd009cd8 | 68 | int dns_answer_find_soa(DnsAnswer *a, const DnsResourceKey *key, DnsResourceRecord **ret, DnsAnswerFlags *flags); |
105e1512 | 69 | int dns_answer_find_cname_or_dname(DnsAnswer *a, const DnsResourceKey *key, DnsResourceRecord **ret, DnsAnswerFlags *flags); |
547973de LP |
70 | |
71 | int dns_answer_merge(DnsAnswer *a, DnsAnswer *b, DnsAnswer **ret); | |
72 | int dns_answer_extend(DnsAnswer **a, DnsAnswer *b); | |
73 | ||
af93291c | 74 | void dns_answer_order_by_scope(DnsAnswer *a, bool prefer_link_local); |
934e9b10 | 75 | |
78c6a153 | 76 | int dns_answer_reserve(DnsAnswer **a, unsigned n_free); |
547973de LP |
77 | int dns_answer_reserve_or_clone(DnsAnswer **a, unsigned n_free); |
78 | ||
79 | int dns_answer_remove_by_key(DnsAnswer **a, const DnsResourceKey *key); | |
0c857028 LP |
80 | int dns_answer_remove_by_rr(DnsAnswer **a, DnsResourceRecord *rr); |
81 | ||
105e1512 LP |
82 | int dns_answer_copy_by_key(DnsAnswer **a, DnsAnswer *source, const DnsResourceKey *key, DnsAnswerFlags or_flags); |
83 | int dns_answer_move_by_key(DnsAnswer **to, DnsAnswer **from, const DnsResourceKey *key, DnsAnswerFlags or_flags); | |
547973de | 84 | |
43e6779a LP |
85 | bool dns_answer_has_dname_for_cname(DnsAnswer *a, DnsResourceRecord *cname); |
86 | ||
547973de LP |
87 | static inline unsigned dns_answer_size(DnsAnswer *a) { |
88 | return a ? a->n_rrs : 0; | |
89 | } | |
78c6a153 | 90 | |
501e8eb0 LP |
91 | static inline bool dns_answer_isempty(DnsAnswer *a) { |
92 | return dns_answer_size(a) <= 0; | |
93 | } | |
94 | ||
26156910 LP |
95 | void dns_answer_dump(DnsAnswer *answer, FILE *f); |
96 | ||
faa133f3 | 97 | DEFINE_TRIVIAL_CLEANUP_FUNC(DnsAnswer*, dns_answer_unref); |
45ec7efb | 98 | |
92aea95e LP |
99 | #define _DNS_ANSWER_FOREACH(q, kk, a) \ |
100 | for (unsigned UNIQ_T(i, q) = ({ \ | |
801ad6a6 | 101 | (kk) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].rr : NULL; \ |
45ec7efb | 102 | 0; \ |
92aea95e LP |
103 | }); \ |
104 | (a) && (UNIQ_T(i, q) < (a)->n_rrs); \ | |
105 | UNIQ_T(i, q)++, (kk) = (UNIQ_T(i, q) < (a)->n_rrs ? (a)->items[UNIQ_T(i, q)].rr : NULL)) | |
45ec7efb | 106 | |
92aea95e LP |
107 | #define DNS_ANSWER_FOREACH(kk, a) _DNS_ANSWER_FOREACH(UNIQ, kk, a) |
108 | ||
aa44ee27 | 109 | #define _DNS_ANSWER_FOREACH_IFINDEX(q, kk, ifi, a) \ |
92aea95e | 110 | for (unsigned UNIQ_T(i, q) = ({ \ |
801ad6a6 | 111 | (kk) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].rr : NULL; \ |
aa44ee27 | 112 | (ifi) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].ifindex : 0; \ |
45ec7efb | 113 | 0; \ |
92aea95e LP |
114 | }); \ |
115 | (a) && (UNIQ_T(i, q) < (a)->n_rrs); \ | |
105e1512 LP |
116 | UNIQ_T(i, q)++, \ |
117 | (kk) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].rr : NULL), \ | |
118 | (ifi) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].ifindex : 0)) | |
92aea95e LP |
119 | |
120 | #define DNS_ANSWER_FOREACH_IFINDEX(kk, ifindex, a) _DNS_ANSWER_FOREACH_IFINDEX(UNIQ, kk, ifindex, a) | |
105e1512 LP |
121 | |
122 | #define _DNS_ANSWER_FOREACH_FLAGS(q, kk, fl, a) \ | |
123 | for (unsigned UNIQ_T(i, q) = ({ \ | |
124 | (kk) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].rr : NULL; \ | |
125 | (fl) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].flags : 0; \ | |
126 | 0; \ | |
127 | }); \ | |
128 | (a) && (UNIQ_T(i, q) < (a)->n_rrs); \ | |
129 | UNIQ_T(i, q)++, \ | |
130 | (kk) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].rr : NULL), \ | |
131 | (fl) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].flags : 0)) | |
132 | ||
133 | #define DNS_ANSWER_FOREACH_FLAGS(kk, flags, a) _DNS_ANSWER_FOREACH_FLAGS(UNIQ, kk, flags, a) | |
134 | ||
135 | #define _DNS_ANSWER_FOREACH_FULL(q, kk, ifi, fl, a) \ | |
136 | for (unsigned UNIQ_T(i, q) = ({ \ | |
137 | (kk) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].rr : NULL; \ | |
138 | (ifi) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].ifindex : 0; \ | |
139 | (fl) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].flags : 0; \ | |
140 | 0; \ | |
141 | }); \ | |
142 | (a) && (UNIQ_T(i, q) < (a)->n_rrs); \ | |
143 | UNIQ_T(i, q)++, \ | |
144 | (kk) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].rr : NULL), \ | |
145 | (ifi) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].ifindex : 0), \ | |
146 | (fl) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].flags : 0)) | |
147 | ||
148 | #define DNS_ANSWER_FOREACH_FULL(kk, ifindex, flags, a) _DNS_ANSWER_FOREACH_FULL(UNIQ, kk, ifindex, flags, a) |