summaryrefslogtreecommitdiffstats
path: root/src/resolve/resolved-dns-stream.h
diff options
context:
space:
mode:
Diffstat (limited to 'src/resolve/resolved-dns-stream.h')
-rw-r--r--src/resolve/resolved-dns-stream.h92
1 files changed, 92 insertions, 0 deletions
diff --git a/src/resolve/resolved-dns-stream.h b/src/resolve/resolved-dns-stream.h
new file mode 100644
index 0000000..f18fc91
--- /dev/null
+++ b/src/resolve/resolved-dns-stream.h
@@ -0,0 +1,92 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+#pragma once
+
+#include "socket-util.h"
+
+typedef struct DnsStream DnsStream;
+
+#include "resolved-dns-packet.h"
+#include "resolved-dns-transaction.h"
+#include "resolved-manager.h"
+#if ENABLE_DNS_OVER_TLS
+#include "resolved-dnstls.h"
+#endif
+
+#define DNS_STREAM_WRITE_TLS_DATA 1
+
+/* Streams are used by three subsystems:
+ *
+ * 1. The normal transaction logic when doing a DNS or LLMNR lookup via TCP
+ * 2. The LLMNR logic when accepting a TCP-based lookup
+ * 3. The DNS stub logic when accepting a TCP-based lookup
+ */
+
+struct DnsStream {
+ Manager *manager;
+ unsigned n_ref;
+
+ DnsProtocol protocol;
+
+ int fd;
+ union sockaddr_union peer;
+ socklen_t peer_salen;
+ union sockaddr_union local;
+ socklen_t local_salen;
+ int ifindex;
+ uint32_t ttl;
+ bool identified;
+
+ /* only when using TCP fast open */
+ union sockaddr_union tfo_address;
+ socklen_t tfo_salen;
+
+#if ENABLE_DNS_OVER_TLS
+ DnsTlsStreamData dnstls_data;
+ int dnstls_events;
+#endif
+
+ sd_event_source *io_event_source;
+ sd_event_source *timeout_event_source;
+
+ be16_t write_size, read_size;
+ DnsPacket *write_packet, *read_packet;
+ size_t n_written, n_read;
+ OrderedSet *write_queue;
+
+ int (*on_packet)(DnsStream *s);
+ int (*complete)(DnsStream *s, int error);
+
+ LIST_HEAD(DnsTransaction, transactions); /* when used by the transaction logic */
+ DnsServer *server; /* when used by the transaction logic */
+ DnsQuery *query; /* when used by the DNS stub logic */
+
+ /* used when DNS-over-TLS is enabled */
+ bool encrypted:1;
+
+ LIST_FIELDS(DnsStream, streams);
+};
+
+int dns_stream_new(Manager *m, DnsStream **s, DnsProtocol protocol, int fd, const union sockaddr_union *tfo_address);
+#if ENABLE_DNS_OVER_TLS
+int dns_stream_connect_tls(DnsStream *s, void *tls_session);
+#endif
+DnsStream *dns_stream_unref(DnsStream *s);
+DnsStream *dns_stream_ref(DnsStream *s);
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(DnsStream*, dns_stream_unref);
+
+int dns_stream_write_packet(DnsStream *s, DnsPacket *p);
+ssize_t dns_stream_writev(DnsStream *s, const struct iovec *iov, size_t iovcnt, int flags);
+
+static inline bool DNS_STREAM_QUEUED(DnsStream *s) {
+ assert(s);
+
+ if (s->fd < 0) /* already stopped? */
+ return false;
+
+ return !!s->write_packet;
+}
+
+DnsPacket *dns_stream_take_read_packet(DnsStream *s);
+
+void dns_stream_detach(DnsStream *s);