1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172

use std::time::Duration;
use std::fs::File;
use std::io::Read;
use std::sync::Arc;
use std::thread::Builder;

use anyhow::Context;
use mio::{Poll, Waker};
use native_tls::{Identity, TlsAcceptor};
use parking_lot::Mutex;
use privdrop::PrivDrop;

pub mod common;
pub mod config;
pub mod handler;
pub mod network;
pub mod tasks;

use common::*;
use config::Config;


pub const APP_NAME: &str = "aquatic_ws: WebTorrent tracker";


pub fn run(config: Config) -> anyhow::Result<()> {
    let state = State::default();

    start_workers(config.clone(), state.clone())?;

    loop {
        ::std::thread::sleep(Duration::from_secs(config.cleaning.interval));

        tasks::clean_torrents(&state);
    }
}


pub fn start_workers(config: Config, state: State) -> anyhow::Result<()> {
    let opt_tls_acceptor = create_tls_acceptor(&config)?;

    let (in_message_sender, in_message_receiver) = ::crossbeam_channel::unbounded();

    let mut out_message_senders = Vec::new();
    let mut wakers = Vec::new();

    let socket_worker_statuses: SocketWorkerStatuses = {
        let mut statuses = Vec::new();

        for _ in 0..config.socket_workers {
            statuses.push(None);
        }

        Arc::new(Mutex::new(statuses))
    };

    for i in 0..config.socket_workers {
        let config = config.clone();
        let socket_worker_statuses = socket_worker_statuses.clone();
        let in_message_sender = in_message_sender.clone();
        let opt_tls_acceptor = opt_tls_acceptor.clone();
        let poll = Poll::new()?;
        let waker = Arc::new(Waker::new(poll.registry(), CHANNEL_TOKEN)?);

        let (out_message_sender, out_message_receiver) = ::crossbeam_channel::unbounded();

        out_message_senders.push(out_message_sender);
        wakers.push(waker);

        Builder::new().name(format!("socket-{:02}", i + 1)).spawn(move || {
            network::run_socket_worker(
                config,
                i,
                socket_worker_statuses,
                poll,
                in_message_sender,
                out_message_receiver,
                opt_tls_acceptor
            );
        })?;
    }

    // Wait for socket worker statuses. On error from any, quit program.
    // On success from all, drop privileges if corresponding setting is set
    // and continue program.
    loop {
        ::std::thread::sleep(::std::time::Duration::from_millis(10));

        if let Some(statuses) = socket_worker_statuses.try_lock(){
            for opt_status in statuses.iter(){
                if let Some(Err(err)) = opt_status {
                    return Err(::anyhow::anyhow!(err.to_owned()));
                }
            }

            if statuses.iter().all(Option::is_some){
                if config.privileges.drop_privileges {
                    PrivDrop::default()
                        .chroot(config.privileges.chroot_path.clone())
                        .user(config.privileges.user.clone())
                        .apply()
                        .context("Couldn't drop root privileges")?;
                }

                break
            }
        }
    }

    let out_message_sender = OutMessageSender::new(out_message_senders);

    for i in 0..config.request_workers {
        let config = config.clone();
        let state = state.clone();
        let in_message_receiver = in_message_receiver.clone();
        let out_message_sender = out_message_sender.clone();
        let wakers = wakers.clone();

        Builder::new().name(format!("request-{:02}", i + 1)).spawn(move || {
            handler::run_request_worker(
                config,
                state,
                in_message_receiver,
                out_message_sender,
                wakers,
            );
        })?;
    }

    if config.statistics.interval != 0 {
        let state = state.clone();
        let config = config.clone();

        Builder::new().name("statistics".to_string()).spawn(move ||
            loop {
                ::std::thread::sleep(Duration::from_secs(
                    config.statistics.interval
                ));

                tasks::print_statistics(&state);
            }
        ).expect("spawn statistics thread");
    }

    Ok(())
}


pub fn create_tls_acceptor(
    config: &Config,
) -> anyhow::Result<Option<TlsAcceptor>> {
    if config.network.use_tls {
        let mut identity_bytes = Vec::new();
        let mut file = File::open(&config.network.tls_pkcs12_path)
            .context("Couldn't open pkcs12 identity file")?;

        file.read_to_end(&mut identity_bytes)
            .context("Couldn't read pkcs12 identity file")?;

        let identity = Identity::from_pkcs12(
            &identity_bytes,
            &config.network.tls_pkcs12_password
        ).context("Couldn't parse pkcs12 identity file")?;

        let acceptor = TlsAcceptor::new(identity)
            .context("Couldn't create TlsAcceptor from pkcs12 identity")?;

        Ok(Some(acceptor))
    } else {
        Ok(None)
    }
}