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resolved: set the AA bit for mDNS responses

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This is required by RFC 6762.

Fixes https://github.com/systemd/systemd/issues/17972
This commit is contained in:
Sergey Bugaev 2021-02-13 17:16:56 +03:00
parent 4ad017cda5
commit bb4e030fcb
1 changed files with 5 additions and 1 deletions
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6
src/resolve/resolved-dns-scope.c
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@ -883,6 +883,7 @@ int dns_scope_make_reply_packet(
_cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
unsigned n_answer = 0, n_soa = 0; unsigned n_answer = 0, n_soa = 0;
int r; int r;
bool c_or_aa;
assert(s); assert(s);
assert(ret); assert(ret);
@ -896,11 +897,14 @@ int dns_scope_make_reply_packet(
if (r < 0) if (r < 0)
return r; return r;
/* mDNS answers must have the Authoritative Answer bit set, see RFC 6762, section 18.4. */
c_or_aa = s->protocol == DNS_PROTOCOL_MDNS;
DNS_PACKET_HEADER(p)->id = id; DNS_PACKET_HEADER(p)->id = id;
DNS_PACKET_HEADER(p)->flags = htobe16(DNS_PACKET_MAKE_FLAGS( DNS_PACKET_HEADER(p)->flags = htobe16(DNS_PACKET_MAKE_FLAGS(
1 /* qr */, 1 /* qr */,
0 /* opcode */, 0 /* opcode */,
0 /* c */, c_or_aa,
0 /* tc */, 0 /* tc */,
tentative, tentative,
0 /* (ra) */, 0 /* (ra) */,