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#pragma once
/***
This file is part of systemd.
Copyright 2014 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include "socket-util.h"
typedef struct DnsStream DnsStream;
#include "resolved-dns-packet.h"
#include "resolved-dns-transaction.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;
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;
int (*on_packet)(DnsStream *s);
int (*complete)(DnsStream *s, int error);
DnsTransaction *transaction; /* 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);
DnsStream *dns_stream_unref(DnsStream *s);
DnsStream *dns_stream_ref(DnsStream *s);
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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