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Diffstat (limited to 'src/resolve/resolved-dns-scope.c')
-rw-r--r--src/resolve/resolved-dns-scope.c57
1 files changed, 55 insertions, 2 deletions
diff --git a/src/resolve/resolved-dns-scope.c b/src/resolve/resolved-dns-scope.c
index 4e0a742768..0a70cb1f0f 100644
--- a/src/resolve/resolved-dns-scope.c
+++ b/src/resolve/resolved-dns-scope.c
@@ -19,7 +19,10 @@
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
+#include <netinet/tcp.h>
+
#include "strv.h"
+#include "socket-util.h"
#include "resolved-dns-domain.h"
#include "resolved-dns-scope.h"
@@ -92,10 +95,14 @@ int dns_scope_send(DnsScope *s, DnsPacket *p) {
srv = dns_scope_get_server(s);
if (!srv)
- return 0;
+ return -ESRCH;
+
+ if (s->link) {
+ if (p->size > s->link->mtu)
+ return -EMSGSIZE;
- if (s->link)
ifindex = s->link->ifindex;
+ }
if (srv->family == AF_INET)
r = manager_dns_ipv4_send(s->manager, srv, ifindex, p);
@@ -110,6 +117,52 @@ int dns_scope_send(DnsScope *s, DnsPacket *p) {
return 1;
}
+int dns_scope_tcp_socket(DnsScope *s) {
+ _cleanup_close_ int fd = -1;
+ union sockaddr_union sa = {};
+ socklen_t salen;
+ int one, ifindex, ret;
+ DnsServer *srv;
+ int r;
+
+ assert(s);
+
+ srv = dns_scope_get_server(s);
+ if (!srv)
+ return -ESRCH;
+
+ if (s->link)
+ ifindex = s->link->ifindex;
+
+ sa.sa.sa_family = srv->family;
+ if (srv->family == AF_INET) {
+ sa.in.sin_port = htobe16(53);
+ sa.in.sin_addr = srv->address.in;
+ salen = sizeof(sa.in);
+ } else if (srv->family == AF_INET6) {
+ sa.in6.sin6_port = htobe16(53);
+ sa.in6.sin6_addr = srv->address.in6;
+ sa.in6.sin6_scope_id = ifindex;
+ salen = sizeof(sa.in6);
+ } else
+ return -EAFNOSUPPORT;
+
+ fd = socket(srv->family, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
+ if (fd < 0)
+ return -errno;
+
+ one = 1;
+ setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &one, sizeof(one));
+
+ r = connect(fd, &sa.sa, salen);
+ if (r < 0 && errno != EINPROGRESS)
+ return -errno;
+
+ ret = fd;
+ fd = -1;
+ return ret;
+}
+
DnsScopeMatch dns_scope_test(DnsScope *s, const char *domain) {
char **i;