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resolved: add more linked packets for overlong known answers

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For mDNS, if we're unable to stuff all known answers into the given packet,
allocate a new one, push the RR into that one and link it to the current
one.
This commit is contained in:
Daniel Mack 2015-12-09 13:09:35 +01:00
parent 80a62095dc
commit 261f3673c1
2 changed files with 19 additions and 1 deletions
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18
src/resolve/resolved-dns-cache.c
View File

@ -738,6 +738,7 @@ int dns_cache_export_shared_to_packet(DnsCache *cache, DnsPacket *p) {
int r;
assert(cache);
assert(p);
HASHMAP_FOREACH(i, cache->by_key, iterator) {
DnsCacheItem *j;
@ -752,6 +753,23 @@ int dns_cache_export_shared_to_packet(DnsCache *cache, DnsPacket *p) {
continue;
r = dns_packet_append_rr(p, j->rr, NULL, NULL);
if (r == -EMSGSIZE && p->protocol == DNS_PROTOCOL_MDNS) {
/* For mDNS, if we're unable to stuff all known answers into the given packet,
* allocate a new one, push the RR into that one and link it to the current one.
*/
DNS_PACKET_HEADER(p)->ancount = htobe16(ancount);
ancount = 0;
r = dns_packet_new_query(&p->more, p->protocol, 0, true);
if (r < 0)
return r;
/* continue with new packet */
p = p->more;
r = dns_packet_append_rr(p, j->rr, NULL, NULL);
}
if (r < 0)
return r;

2
src/resolve/resolved-dns-scope.c
View File

@ -290,7 +290,7 @@ int dns_scope_emit(DnsScope *s, int fd, DnsServer *server, DnsPacket *p) {
/* If there are multiple linked packets, set the TC bit in all but the last of them */
if (p->more) {
assert(p->protocol == DNS_PROTOCOL_MDNS);
dns_packet_set_truncated_flag(p, true);
dns_packet_set_flags(p, true, true);
}
r = dns_scope_emit_one(s, fd, server, p);