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Commit | Line | Data |
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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
faa133f3 LP |
2 | #pragma once |
3 | ||
faa133f3 | 4 | typedef struct DnsAnswer DnsAnswer; |
78c6a153 | 5 | typedef struct DnsAnswerItem DnsAnswerItem; |
faa133f3 | 6 | |
92aea95e | 7 | #include "macro.h" |
faa133f3 | 8 | #include "resolved-dns-rr.h" |
ae45e1a3 | 9 | #include "set.h" |
faa133f3 | 10 | |
78c6a153 LP |
11 | /* A simple array of resource records. We keep track of the |
12 | * originating ifindex for each RR where that makes sense, so that we | |
13 | * can qualify A and AAAA RRs referring to a local link with the | |
547973de LP |
14 | * right ifindex. |
15 | * | |
c629ff58 | 16 | * Note that we usually encode the empty DnsAnswer object as a simple NULL. */ |
105e1512 LP |
17 | |
18 | typedef enum DnsAnswerFlags { | |
be0b7a1a LP |
19 | DNS_ANSWER_AUTHENTICATED = 1 << 0, /* Item has been authenticated */ |
20 | DNS_ANSWER_CACHEABLE = 1 << 1, /* Item is subject to caching */ | |
21 | DNS_ANSWER_SHARED_OWNER = 1 << 2, /* For mDNS: RRset may be owner by multiple peers */ | |
22 | DNS_ANSWER_CACHE_FLUSH = 1 << 3, /* For mDNS: sets cache-flush bit in the rrclass of response records */ | |
23 | DNS_ANSWER_GOODBYE = 1 << 4, /* For mDNS: item is subject to disappear */ | |
105e1512 | 24 | } DnsAnswerFlags; |
78c6a153 LP |
25 | |
26 | struct DnsAnswerItem { | |
27 | DnsResourceRecord *rr; | |
28 | int ifindex; | |
105e1512 | 29 | DnsAnswerFlags flags; |
78c6a153 | 30 | }; |
faa133f3 LP |
31 | |
32 | struct DnsAnswer { | |
33 | unsigned n_ref; | |
ae45e1a3 | 34 | Set *set_items; /* Used by dns_answer_add() for optimization. */ |
da6053d0 | 35 | size_t n_rrs, n_allocated; |
78c6a153 | 36 | DnsAnswerItem items[0]; |
faa133f3 LP |
37 | }; |
38 | ||
da6053d0 | 39 | DnsAnswer *dns_answer_new(size_t n); |
faa133f3 LP |
40 | DnsAnswer *dns_answer_ref(DnsAnswer *a); |
41 | DnsAnswer *dns_answer_unref(DnsAnswer *a); | |
42 | ||
105e1512 LP |
43 | int dns_answer_add(DnsAnswer *a, DnsResourceRecord *rr, int ifindex, DnsAnswerFlags flags); |
44 | int dns_answer_add_extend(DnsAnswer **a, DnsResourceRecord *rr, int ifindex, DnsAnswerFlags flags); | |
97ebebbc | 45 | int dns_answer_add_soa(DnsAnswer *a, const char *name, uint32_t ttl, int ifindex); |
faa133f3 | 46 | |
105e1512 | 47 | int dns_answer_match_key(DnsAnswer *a, const DnsResourceKey *key, DnsAnswerFlags *combined_flags); |
105e1512 | 48 | int dns_answer_contains_nsec_or_nsec3(DnsAnswer *a); |
e926785a | 49 | int dns_answer_contains_zone_nsec3(DnsAnswer *answer, const char *zone); |
7d44b198 | 50 | int dns_answer_contains(DnsAnswer *answer, DnsResourceRecord *rr); |
547973de | 51 | |
b17b6a74 LP |
52 | int dns_answer_find_soa(DnsAnswer *a, const DnsResourceKey *key, DnsResourceRecord **ret, DnsAnswerFlags *ret_flags); |
53 | int dns_answer_find_cname_or_dname(DnsAnswer *a, const DnsResourceKey *key, DnsResourceRecord **ret, DnsAnswerFlags *ret_flags); | |
547973de LP |
54 | |
55 | int dns_answer_merge(DnsAnswer *a, DnsAnswer *b, DnsAnswer **ret); | |
56 | int dns_answer_extend(DnsAnswer **a, DnsAnswer *b); | |
57 | ||
af93291c | 58 | void dns_answer_order_by_scope(DnsAnswer *a, bool prefer_link_local); |
934e9b10 | 59 | |
da6053d0 LP |
60 | int dns_answer_reserve(DnsAnswer **a, size_t n_free); |
61 | int dns_answer_reserve_or_clone(DnsAnswer **a, size_t n_free); | |
547973de LP |
62 | |
63 | int dns_answer_remove_by_key(DnsAnswer **a, const DnsResourceKey *key); | |
0c857028 LP |
64 | int dns_answer_remove_by_rr(DnsAnswer **a, DnsResourceRecord *rr); |
65 | ||
105e1512 LP |
66 | int dns_answer_copy_by_key(DnsAnswer **a, DnsAnswer *source, const DnsResourceKey *key, DnsAnswerFlags or_flags); |
67 | int dns_answer_move_by_key(DnsAnswer **to, DnsAnswer **from, const DnsResourceKey *key, DnsAnswerFlags or_flags); | |
547973de | 68 | |
a5042ec4 | 69 | int dns_answer_has_dname_for_cname(DnsAnswer *a, DnsResourceRecord *cname); |
43e6779a | 70 | |
da6053d0 | 71 | static inline size_t dns_answer_size(DnsAnswer *a) { |
547973de LP |
72 | return a ? a->n_rrs : 0; |
73 | } | |
78c6a153 | 74 | |
501e8eb0 LP |
75 | static inline bool dns_answer_isempty(DnsAnswer *a) { |
76 | return dns_answer_size(a) <= 0; | |
77 | } | |
78 | ||
26156910 LP |
79 | void dns_answer_dump(DnsAnswer *answer, FILE *f); |
80 | ||
faa133f3 | 81 | DEFINE_TRIVIAL_CLEANUP_FUNC(DnsAnswer*, dns_answer_unref); |
45ec7efb | 82 | |
92aea95e | 83 | #define _DNS_ANSWER_FOREACH(q, kk, a) \ |
da6053d0 | 84 | for (size_t UNIQ_T(i, q) = ({ \ |
801ad6a6 | 85 | (kk) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].rr : NULL; \ |
45ec7efb | 86 | 0; \ |
92aea95e LP |
87 | }); \ |
88 | (a) && (UNIQ_T(i, q) < (a)->n_rrs); \ | |
89 | UNIQ_T(i, q)++, (kk) = (UNIQ_T(i, q) < (a)->n_rrs ? (a)->items[UNIQ_T(i, q)].rr : NULL)) | |
45ec7efb | 90 | |
92aea95e LP |
91 | #define DNS_ANSWER_FOREACH(kk, a) _DNS_ANSWER_FOREACH(UNIQ, kk, a) |
92 | ||
aa44ee27 | 93 | #define _DNS_ANSWER_FOREACH_IFINDEX(q, kk, ifi, a) \ |
da6053d0 | 94 | for (size_t UNIQ_T(i, q) = ({ \ |
801ad6a6 | 95 | (kk) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].rr : NULL; \ |
aa44ee27 | 96 | (ifi) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].ifindex : 0; \ |
45ec7efb | 97 | 0; \ |
92aea95e LP |
98 | }); \ |
99 | (a) && (UNIQ_T(i, q) < (a)->n_rrs); \ | |
105e1512 LP |
100 | UNIQ_T(i, q)++, \ |
101 | (kk) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].rr : NULL), \ | |
102 | (ifi) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].ifindex : 0)) | |
92aea95e LP |
103 | |
104 | #define DNS_ANSWER_FOREACH_IFINDEX(kk, ifindex, a) _DNS_ANSWER_FOREACH_IFINDEX(UNIQ, kk, ifindex, a) | |
105e1512 LP |
105 | |
106 | #define _DNS_ANSWER_FOREACH_FLAGS(q, kk, fl, a) \ | |
da6053d0 | 107 | for (size_t UNIQ_T(i, q) = ({ \ |
105e1512 LP |
108 | (kk) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].rr : NULL; \ |
109 | (fl) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].flags : 0; \ | |
110 | 0; \ | |
111 | }); \ | |
112 | (a) && (UNIQ_T(i, q) < (a)->n_rrs); \ | |
113 | UNIQ_T(i, q)++, \ | |
114 | (kk) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].rr : NULL), \ | |
115 | (fl) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].flags : 0)) | |
116 | ||
117 | #define DNS_ANSWER_FOREACH_FLAGS(kk, flags, a) _DNS_ANSWER_FOREACH_FLAGS(UNIQ, kk, flags, a) | |
118 | ||
9c5fcb8a | 119 | #define _DNS_ANSWER_FOREACH_ITEM(q, item, a) \ |
da6053d0 | 120 | for (size_t UNIQ_T(i, q) = ({ \ |
9c5fcb8a | 121 | (item) = dns_answer_isempty(a) ? NULL : (a)->items; \ |
105e1512 LP |
122 | 0; \ |
123 | }); \ | |
9c5fcb8a | 124 | UNIQ_T(i, q) < dns_answer_size(a); \ |
105e1512 | 125 | UNIQ_T(i, q)++, \ |
9c5fcb8a | 126 | (item) = ((UNIQ_T(i, q) < dns_answer_size(a)) ? (a)->items + UNIQ_T(i, q) : NULL)) |
105e1512 | 127 | |
9c5fcb8a | 128 | #define DNS_ANSWER_FOREACH_ITEM(item, a) _DNS_ANSWER_FOREACH_ITEM(UNIQ, item, a) |