resolved: create dns scopes for mDNS

Follow what LLMNR does, and create per-link DnsScope objects.

1 files changed, 25 insertions, 3 deletions

diff --git a/src/resolve/resolved-dns-scope.c b/src/resolve/resolved-dns-scope.c
index 10148cb08e..eae903526b 100644
--- a/src/resolve/resolved-dns-scope.c
+++ b/src/resolve/resolved-dns-scope.c
@@ -30,6 +30,7 @@
 #include "random-util.h"
 #include "resolved-dns-scope.h"
 #include "resolved-llmnr.h"
+#include "resolved-mdns.h"
 #include "socket-util.h"
 #include "strv.h"
 
@@ -164,7 +165,6 @@ int dns_scope_emit(DnsScope *s, int fd, DnsServer *server, DnsPacket *p) {
         union in_addr_union addr;
         int ifindex = 0, r;
         int family;
-        uint16_t port;
         uint32_t mtu;
         size_t saved_size = 0;
 
@@ -230,7 +230,6 @@ int dns_scope_emit(DnsScope *s, int fd, DnsServer *server, DnsPacket *p) {
                         return -EBUSY;
 
                 family = s->family;
-                port = LLMNR_PORT;
 
                 if (family == AF_INET) {
                         addr.in = LLMNR_MULTICAST_IPV4_ADDRESS;
@@ -243,7 +242,30 @@ int dns_scope_emit(DnsScope *s, int fd, DnsServer *server, DnsPacket *p) {
                 if (fd < 0)
                         return fd;
 
-                r = manager_send(s->manager, fd, ifindex, family, &addr, port, p);
+                r = manager_send(s->manager, fd, ifindex, family, &addr, LLMNR_PORT, p);
+                if (r < 0)
+                        return r;
+
+                break;
+
+        case DNS_PROTOCOL_MDNS:
+                if (!ratelimit_test(&s->ratelimit))
+                        return -EBUSY;
+
+                family = s->family;
+
+                if (family == AF_INET) {
+                        addr.in = MDNS_MULTICAST_IPV4_ADDRESS;
+                        fd = manager_mdns_ipv4_fd(s->manager);
+                } else if (family == AF_INET6) {
+                        addr.in6 = MDNS_MULTICAST_IPV6_ADDRESS;
+                        fd = manager_mdns_ipv6_fd(s->manager);
+                } else
+                        return -EAFNOSUPPORT;
+                if (fd < 0)
+                        return fd;
+
+                r = manager_send(s->manager, fd, ifindex, family, &addr, MDNS_PORT, p);
                 if (r < 0)
                         return r;