resolved: rework mDNS cache-flush bit handling

This adds a new DnsAnswer item flag "DNS_ANSWER_SHARED_OWNER" which is
set for mDNS RRs that lack the cache-flush bit. The cache-flush bit is
removed from the DnsResourceRecord object in favour of this.

This also splits out the code that removes previous entries when adding
new positive ones into a new separate call dns_cache_remove_previous().

1 files changed, 2 insertions, 2 deletions

diff --git a/src/resolve/resolved-dns-packet.h b/src/resolve/resolved-dns-packet.h
index 082e92833c..36da86dee5 100644
--- a/src/resolve/resolved-dns-packet.h
+++ b/src/resolve/resolved-dns-packet.h
@@ -185,8 +185,8 @@ int dns_packet_read_uint32(DnsPacket *p, uint32_t *ret, size_t *start);
 int dns_packet_read_string(DnsPacket *p, char **ret, size_t *start);
 int dns_packet_read_raw_string(DnsPacket *p, const void **ret, size_t *size, size_t *start);
 int dns_packet_read_name(DnsPacket *p, char **ret, bool allow_compression, size_t *start);
-int dns_packet_read_key(DnsPacket *p, DnsResourceKey **ret, size_t *start);
-int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, size_t *start);
+int dns_packet_read_key(DnsPacket *p, DnsResourceKey **ret, bool *ret_cache_flush, size_t *start);
+int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, bool *ret_cache_flush, size_t *start);
 
 void dns_packet_rewind(DnsPacket *p, size_t idx);