diff options
| author | Daniel Mack <daniel@zonque.org> | 2015-07-10 20:44:46 -0400 |
|---|---|---|
| committer | Daniel Mack <daniel@zonque.org> | 2015-12-08 16:41:45 +0100 |
| commit | 4e5bf5e15899de3f9d11c2ddfe9721d9f8b07a37 (patch) | |
| tree | 910ca3de1b0d59411ce0e5bdbce665dbff6a6510 /src/resolve/resolved-dns-packet.c | |
| parent | bc7702b098b63031767174206f5df14a8ccb45cf (diff) | |
resolved: add packet header details for mDNS
Validate mDNS queries and responses by looking at some header fields,
add mDNS flags.
Diffstat (limited to 'src/resolve/resolved-dns-packet.c')
| -rw-r--r-- | src/resolve/resolved-dns-packet.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/src/resolve/resolved-dns-packet.c b/src/resolve/resolved-dns-packet.c index ea776f7916..3a4482a1b7 100644 --- a/src/resolve/resolved-dns-packet.c +++ b/src/resolve/resolved-dns-packet.c @@ -88,6 +88,16 @@ int dns_packet_new_query(DnsPacket **ret, DnsProtocol protocol, size_t mtu, bool 0 /* ad */, 0 /* cd */, 0 /* rcode */)); + else if (protocol == DNS_PROTOCOL_MDNS) + h->flags = htobe16(DNS_PACKET_MAKE_FLAGS(0 /* qr */, + 0 /* opcode */, + 0 /* aa */, + 0 /* tc */, + 0 /* rd (ask for recursion) */, + 0 /* ra */, + 0 /* ad */, + 0 /* cd */, + 0 /* rcode */)); else h->flags = htobe16(DNS_PACKET_MAKE_FLAGS(0 /* qr */, 0 /* opcode */, @@ -182,6 +192,13 @@ int dns_packet_validate_reply(DnsPacket *p) { break; + case DNS_PROTOCOL_MDNS: + /* RFC 6762, Section 18 */ + if (DNS_PACKET_RCODE(p) != 0) + return -EBADMSG; + + break; + default: break; } @@ -223,6 +240,18 @@ int dns_packet_validate_query(DnsPacket *p) { break; + case DNS_PROTOCOL_MDNS: + /* RFC 6762, Section 18 */ + if (DNS_PACKET_AA(p) != 0 || + DNS_PACKET_RD(p) != 0 || + DNS_PACKET_RA(p) != 0 || + DNS_PACKET_AD(p) != 0 || + DNS_PACKET_CD(p) != 0 || + DNS_PACKET_RCODE(p) != 0) + return -EBADMSG; + + break; + default: break; } |