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-rw-r--r--src/resolve/resolved-def.h6
-rw-r--r--src/resolve/resolved-dns-packet.c29
-rw-r--r--src/resolve/resolved-dns-packet.h3
-rw-r--r--src/resolve/resolved-dns-transaction.c12
4 files changed, 49 insertions, 1 deletions
diff --git a/src/resolve/resolved-def.h b/src/resolve/resolved-def.h
index db5ee57b51..6014d345f3 100644
--- a/src/resolve/resolved-def.h
+++ b/src/resolve/resolved-def.h
@@ -24,6 +24,8 @@
#define SD_RESOLVED_DNS (UINT64_C(1) << 0)
#define SD_RESOLVED_LLMNR_IPV4 (UINT64_C(1) << 1)
#define SD_RESOLVED_LLMNR_IPV6 (UINT64_C(1) << 2)
+#define SD_RESOLVED_MDNS_IPV4 (UINT64_C(1) << 3)
+#define SD_RESOLVED_MDNS_IPV6 (UINT64_C(1) << 4)
#define SD_RESOLVED_NO_CNAME (UINT64_C(1) << 5)
#define SD_RESOLVED_NO_TXT (UINT64_C(1) << 6)
#define SD_RESOLVED_NO_ADDRESS (UINT64_C(1) << 7)
@@ -31,4 +33,6 @@
#define SD_RESOLVED_AUTHENTICATED (UINT64_C(1) << 9)
#define SD_RESOLVED_LLMNR (SD_RESOLVED_LLMNR_IPV4|SD_RESOLVED_LLMNR_IPV6)
-#define SD_RESOLVED_PROTOCOLS_ALL (SD_RESOLVED_LLMNR|SD_RESOLVED_DNS)
+#define SD_RESOLVED_MDNS (SD_RESOLVED_MDNS_IPV4|SD_RESOLVED_MDNS_IPV6)
+
+#define SD_RESOLVED_PROTOCOLS_ALL (SD_RESOLVED_MDNS|SD_RESOLVED_LLMNR|SD_RESOLVED_DNS)
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;
}
diff --git a/src/resolve/resolved-dns-packet.h b/src/resolve/resolved-dns-packet.h
index aa2823cfb9..1d275f8110 100644
--- a/src/resolve/resolved-dns-packet.h
+++ b/src/resolve/resolved-dns-packet.h
@@ -239,6 +239,9 @@ static inline uint64_t SD_RESOLVED_FLAGS_MAKE(DnsProtocol protocol, int family,
case DNS_PROTOCOL_LLMNR:
return f|(family == AF_INET6 ? SD_RESOLVED_LLMNR_IPV6 : SD_RESOLVED_LLMNR_IPV4);
+ case DNS_PROTOCOL_MDNS:
+ return family == AF_INET6 ? SD_RESOLVED_MDNS_IPV6 : SD_RESOLVED_MDNS_IPV4;
+
default:
break;
}
diff --git a/src/resolve/resolved-dns-transaction.c b/src/resolve/resolved-dns-transaction.c
index 1103a34c6f..f77931ed53 100644
--- a/src/resolve/resolved-dns-transaction.c
+++ b/src/resolve/resolved-dns-transaction.c
@@ -384,6 +384,18 @@ void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p) {
break;
+ case DNS_PROTOCOL_MDNS:
+ assert(t->scope->link);
+
+ /* For mDNS we will not accept any packets from other interfaces */
+ if (p->ifindex != t->scope->link->ifindex)
+ return;
+
+ if (p->family != t->scope->family)
+ return;
+
+ break;
+
case DNS_PROTOCOL_DNS:
break;