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authorDaniel Mack <daniel@zonque.org>2015-07-11 13:17:51 -0400
committerDaniel Mack <daniel@zonque.org>2015-12-08 16:41:45 +0100
commitb4f1862df2e45aba90386887d685b8bf3c840e10 (patch)
tree08fa71f0eda4a334661e3d9a6e20bd043414c285
parent0db4c90afd7d9c7c8884bf8b3ec459edc74a03da (diff)
resolved: create dns scopes for mDNS
Follow what LLMNR does, and create per-link DnsScope objects.
-rw-r--r--src/resolve/resolved-dns-scope.c28
-rw-r--r--src/resolve/resolved-link.c24
-rw-r--r--src/resolve/resolved-link.h2
-rw-r--r--src/resolve/resolved-manager.c16
4 files changed, 66 insertions, 4 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;
diff --git a/src/resolve/resolved-link.c b/src/resolve/resolved-link.c
index ddd9427dab..84100bd988 100644
--- a/src/resolve/resolved-link.c
+++ b/src/resolve/resolved-link.c
@@ -77,6 +77,8 @@ Link *link_free(Link *l) {
dns_scope_free(l->unicast_scope);
dns_scope_free(l->llmnr_ipv4_scope);
dns_scope_free(l->llmnr_ipv6_scope);
+ dns_scope_free(l->mdns_ipv4_scope);
+ dns_scope_free(l->mdns_ipv6_scope);
free(l);
return NULL;
@@ -118,6 +120,28 @@ static void link_allocate_scopes(Link *l) {
}
} else
l->llmnr_ipv6_scope = dns_scope_free(l->llmnr_ipv6_scope);
+
+ if (link_relevant(l, AF_INET) &&
+ l->mdns_support != SUPPORT_NO &&
+ l->manager->mdns_support != SUPPORT_NO) {
+ if (!l->mdns_ipv4_scope) {
+ r = dns_scope_new(l->manager, &l->mdns_ipv4_scope, l, DNS_PROTOCOL_MDNS, AF_INET);
+ if (r < 0)
+ log_warning_errno(r, "Failed to allocate mDNS IPv4 scope: %m");
+ }
+ } else
+ l->mdns_ipv4_scope = dns_scope_free(l->mdns_ipv4_scope);
+
+ if (link_relevant(l, AF_INET6) &&
+ l->mdns_support != SUPPORT_NO &&
+ l->manager->mdns_support != SUPPORT_NO) {
+ if (!l->mdns_ipv6_scope) {
+ r = dns_scope_new(l->manager, &l->mdns_ipv6_scope, l, DNS_PROTOCOL_MDNS, AF_INET6);
+ if (r < 0)
+ log_warning_errno(r, "Failed to allocate mDNS IPv6 scope: %m");
+ }
+ } else
+ l->mdns_ipv6_scope = dns_scope_free(l->mdns_ipv6_scope);
}
void link_add_rrs(Link *l, bool force_remove) {
diff --git a/src/resolve/resolved-link.h b/src/resolve/resolved-link.h
index 3093050c98..a3b406bbc2 100644
--- a/src/resolve/resolved-link.h
+++ b/src/resolve/resolved-link.h
@@ -72,6 +72,8 @@ struct Link {
DnsScope *unicast_scope;
DnsScope *llmnr_ipv4_scope;
DnsScope *llmnr_ipv6_scope;
+ DnsScope *mdns_ipv4_scope;
+ DnsScope *mdns_ipv6_scope;
char name[IF_NAMESIZE];
uint32_t mtu;
diff --git a/src/resolve/resolved-manager.c b/src/resolve/resolved-manager.c
index fc2fb4d47c..a2677f442a 100644
--- a/src/resolve/resolved-manager.c
+++ b/src/resolve/resolved-manager.c
@@ -1031,11 +1031,25 @@ DnsScope* manager_find_scope(Manager *m, DnsPacket *p) {
if (!l)
return NULL;
- if (p->protocol == DNS_PROTOCOL_LLMNR) {
+ switch (p->protocol) {
+ case DNS_PROTOCOL_LLMNR:
if (p->family == AF_INET)
return l->llmnr_ipv4_scope;
else if (p->family == AF_INET6)
return l->llmnr_ipv6_scope;
+
+ break;
+
+ case DNS_PROTOCOL_MDNS:
+ if (p->family == AF_INET)
+ return l->mdns_ipv4_scope;
+ else if (p->family == AF_INET6)
+ return l->mdns_ipv6_scope;
+
+ break;
+
+ default:
+ break;
}
return NULL;