1 files changed, 107 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..dba0644
--- /dev/null
+++ b/src/resolve/resolved-dns-stream.h
@@ -0,0 +1,107 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include "sd-event.h"
+
+#include "ordered-set.h"
+#include "socket-util.h"
+
+typedef struct DnsServer DnsServer;
+typedef struct DnsStream DnsStream;
+typedef struct DnsTransaction DnsTransaction;
+typedef struct Manager Manager;
+typedef struct DnsStubListenerExtra DnsStubListenerExtra;
+
+#include "resolved-dns-packet.h"
+#include "resolved-dnstls.h"
+
+typedef enum DnsStreamType {
+        DNS_STREAM_LOOKUP,        /* Outgoing connection to a classic DNS server */
+        DNS_STREAM_LLMNR_SEND,    /* Outgoing LLMNR TCP lookup */
+        DNS_STREAM_LLMNR_RECV,    /* Incoming LLMNR TCP lookup */
+        DNS_STREAM_STUB,          /* Incoming DNS stub connection */
+        _DNS_STREAM_TYPE_MAX,
+        _DNS_STREAM_TYPE_INVALID = -1,
+} DnsStreamType;
+
+#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;
+
+        DnsStreamType type;
+        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 */
+        Set *queries;                            /* when used by the DNS stub logic */
+
+        /* used when DNS-over-TLS is enabled */
+        bool encrypted:1;
+
+        DnsStubListenerExtra *stub_listener_extra;
+
+        LIST_FIELDS(DnsStream, streams);
+};
+
+int dns_stream_new(Manager *m, DnsStream **s, DnsStreamType type, 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);