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/* 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 <gnutls/gnutls.h>
#endif
/* 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;
int 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
gnutls_session_t tls_session;
int tls_handshake;
bool tls_bye;
#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_connection)(DnsStream *s);
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, gnutls_session_t 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);
static inline bool DNS_STREAM_QUEUED(DnsStream *s) {
assert(s);
if (s->fd < 0) /* already stopped? */
return false;
return !!s->write_packet;
}
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