78 lines
2.1 KiB
C
78 lines
2.1 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
|
|
#pragma once
|
|
|
|
/***
|
|
This file is part of systemd.
|
|
|
|
Copyright 2014 Lennart Poettering
|
|
***/
|
|
|
|
#include "socket-util.h"
|
|
|
|
typedef struct DnsStream DnsStream;
|
|
|
|
#include "resolved-dns-packet.h"
|
|
#include "resolved-dns-transaction.h"
|
|
#include "resolved-manager.h"
|
|
|
|
/* 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;
|
|
|
|
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 */
|
|
|
|
LIST_FIELDS(DnsStream, streams);
|
|
};
|
|
|
|
int dns_stream_new(Manager *m, DnsStream **s, DnsProtocol protocol, int fd, const union sockaddr_union *tfo_address);
|
|
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;
|
|
}
|