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
|
/* Copyright (C) 2022 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "knot/query/query.h"
#include "contrib/wire_ctx.h"
#include "libdnssec/random.h"
void query_init_pkt(knot_pkt_t *pkt)
{
if (pkt == NULL) {
return;
}
knot_pkt_clear(pkt);
knot_wire_set_id(pkt->wire, dnssec_random_uint16_t());
}
query_edns_data_t query_edns_data_init(conf_t *conf, int remote_family,
query_edns_opt_t opts)
{
assert(conf);
query_edns_data_t edns = {
.max_payload = remote_family == AF_INET ?
conf->cache.srv_udp_max_payload_ipv4 :
conf->cache.srv_udp_max_payload_ipv6,
.do_flag = (opts & QUERY_EDNS_OPT_DO),
.expire_option = (opts & QUERY_EDNS_OPT_EXPIRE)
};
return edns;
}
int query_put_edns(knot_pkt_t *pkt, const query_edns_data_t *edns)
{
if (!pkt || !edns) {
return KNOT_EINVAL;
}
// Construct EDNS RR
knot_rrset_t opt_rr = { 0 };
int ret = knot_edns_init(&opt_rr, edns->max_payload, 0, KNOT_EDNS_VERSION, &pkt->mm);
if (ret != KNOT_EOK) {
return ret;
}
if (edns->do_flag) {
knot_edns_set_do(&opt_rr);
}
if (edns->expire_option) {
ret = knot_edns_add_option(&opt_rr, KNOT_EDNS_OPTION_EXPIRE, 0, NULL, &pkt->mm);
if (ret != KNOT_EOK) {
knot_rrset_clear(&opt_rr, &pkt->mm);
return ret;
}
}
// Add result into the packet
knot_pkt_begin(pkt, KNOT_ADDITIONAL);
ret = knot_pkt_put(pkt, KNOT_COMPR_HINT_NOCOMP, &opt_rr, KNOT_PF_FREE);
if (ret != KNOT_EOK) {
knot_rrset_clear(&opt_rr, &pkt->mm);
return ret;
}
return KNOT_EOK;
}
|
