101 lines
2.9 KiB
C
101 lines
2.9 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#pragma once
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#include "socket-util.h"
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typedef struct DnsStream DnsStream;
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typedef enum DnsStreamType {
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DNS_STREAM_LOOKUP, /* Outgoing connection to a classic DNS server */
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DNS_STREAM_LLMNR_SEND, /* Outgoing LLMNR TCP lookup */
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DNS_STREAM_LLMNR_RECV, /* Incoming LLMNR TCP lookup */
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DNS_STREAM_STUB, /* Incoming DNS stub connection */
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_DNS_STREAM_TYPE_MAX,
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_DNS_STREAM_TYPE_INVALID = -1,
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} DnsStreamType;
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#include "resolved-dns-packet.h"
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#include "resolved-dns-transaction.h"
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#include "resolved-dnstls.h"
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#include "resolved-manager.h"
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#define DNS_STREAM_WRITE_TLS_DATA 1
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/* Streams are used by three subsystems:
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*
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* 1. The normal transaction logic when doing a DNS or LLMNR lookup via TCP
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* 2. The LLMNR logic when accepting a TCP-based lookup
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* 3. The DNS stub logic when accepting a TCP-based lookup
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*/
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struct DnsStream {
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Manager *manager;
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unsigned n_ref;
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DnsStreamType type;
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DnsProtocol protocol;
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int fd;
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union sockaddr_union peer;
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socklen_t peer_salen;
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union sockaddr_union local;
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socklen_t local_salen;
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int ifindex;
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uint32_t ttl;
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bool identified;
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/* only when using TCP fast open */
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union sockaddr_union tfo_address;
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socklen_t tfo_salen;
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#if ENABLE_DNS_OVER_TLS
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DnsTlsStreamData dnstls_data;
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int dnstls_events;
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#endif
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sd_event_source *io_event_source;
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sd_event_source *timeout_event_source;
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be16_t write_size, read_size;
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DnsPacket *write_packet, *read_packet;
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size_t n_written, n_read;
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OrderedSet *write_queue;
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int (*on_packet)(DnsStream *s);
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int (*complete)(DnsStream *s, int error);
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LIST_HEAD(DnsTransaction, transactions); /* when used by the transaction logic */
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DnsServer *server; /* when used by the transaction logic */
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Set *queries; /* when used by the DNS stub logic */
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/* used when DNS-over-TLS is enabled */
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bool encrypted:1;
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LIST_FIELDS(DnsStream, streams);
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};
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int dns_stream_new(Manager *m, DnsStream **s, DnsStreamType type, DnsProtocol protocol, int fd, const union sockaddr_union *tfo_address);
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#if ENABLE_DNS_OVER_TLS
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int dns_stream_connect_tls(DnsStream *s, void *tls_session);
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#endif
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DnsStream *dns_stream_unref(DnsStream *s);
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DnsStream *dns_stream_ref(DnsStream *s);
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DEFINE_TRIVIAL_CLEANUP_FUNC(DnsStream*, dns_stream_unref);
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int dns_stream_write_packet(DnsStream *s, DnsPacket *p);
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ssize_t dns_stream_writev(DnsStream *s, const struct iovec *iov, size_t iovcnt, int flags);
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static inline bool DNS_STREAM_QUEUED(DnsStream *s) {
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assert(s);
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if (s->fd < 0) /* already stopped? */
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return false;
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return !!s->write_packet;
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}
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DnsPacket *dns_stream_take_read_packet(DnsStream *s);
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void dns_stream_detach(DnsStream *s);
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