resolved: add a DNS client stub resolver

Let's turn resolved into a something truly useful: a fully asynchronous
DNS stub resolver that subscribes to network changes.

(More to come: caching, LLMNR, mDNS/DNS-SD, DNSSEC, IDN, NSS module)

1 files changed, 69 insertions, 0 deletions

diff --git a/src/resolve/resolved-dns-scope.h b/src/resolve/resolved-dns-scope.h
new file mode 100644
index 0000000000..50f1106bf1
--- /dev/null
+++ b/src/resolve/resolved-dns-scope.h
@@ -0,0 +1,69 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#pragma once
+
+/***
+  This file is part of systemd.
+
+  Copyright 2014 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include "list.h"
+
+typedef struct DnsScope DnsScope;
+
+#include "resolved.h"
+#include "resolved-link.h"
+#include "resolved-dns-server.h"
+#include "resolved-dns-packet.h"
+#include "resolved-dns-query.h"
+
+typedef enum DnsScopeType {
+        DNS_SCOPE_DNS,
+        DNS_SCOPE_MDNS,
+} DnsScopeType;
+
+typedef enum DnsScopeMatch {
+        DNS_SCOPE_NO,
+        DNS_SCOPE_MAYBE,
+        DNS_SCOPE_YES,
+        _DNS_SCOPE_MATCH_MAX,
+        _DNS_SCOPE_INVALID = -1
+} DnsScopeMatch;
+
+struct DnsScope {
+        Manager *manager;
+
+        DnsScopeType type;
+        unsigned char family;
+
+        Link *link;
+
+        char **domains;
+
+        LIST_HEAD(DnsQueryTransaction, transactions);
+
+        LIST_FIELDS(DnsScope, scopes);
+};
+
+int dns_scope_new(Manager *m, DnsScope **ret, DnsScopeType t);
+DnsScope* dns_scope_free(DnsScope *s);
+
+int dns_scope_send(DnsScope *s, DnsPacket *p);
+DnsScopeMatch dns_scope_test(DnsScope *s, const char *domain);
+
+DnsServer *dns_scope_get_server(DnsScope *s);
+void dns_scope_next_dns_server(DnsScope *s);