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rtorrent开启rpc：

scgi_port = 127.0.0.1:5000

通过nginx中转rpc请求：

server {
    listen 8000;
    server_name localhost;
    location ^~ /RPC2 {
        include scgi_params;
        scgi_pass   127.0.0.1:5000;
    }
}

php需安装xmlrpc扩展：

<?php
class XMLRPCClient
{
  public function __construct($uri)
  {
    $this->uri = $uri;
    $this->ch = null;
  }

  public function __destruct()
  {
    $this->close();
  }

  public function close()
  {
    if ($this->ch !== null)
    {
      curl_close($this->ch);
    }
    $this->ch = null;
  }

  public function get($method, $params = array())
  {
    $xml = xmlrpc_encode_request($method,$params);
    if ($this->ch === null)
    {
      $this->ch = curl_init();
      curl_setopt($this->ch, CURLOPT_URL, $this->uri);
      curl_setopt($this->ch, CURLOPT_HEADER, 0); 
      curl_setopt($this->ch, CURLOPT_RETURNTRANSFER, true);
      curl_setopt($this->ch, CURLOPT_POST, true);
    }
    curl_setopt($this->ch, CURLOPT_POSTFIELDS, $xml);
    $response = curl_exec($this->ch);
    $response = str_replace('i8>', 'string>', $response);
    $result = xmlrpc_decode_request($response, $method);
    return $result;
  }
}

$client = new XMLRPCClient("http://127.0.0.1:8000/RPC2");
//查看rpc命令列表
var_dump($client->get("system.listMethods"));
//查看任务列表
$list = $client->get("download_list", array("","started"));
//文件路径
$filepath = $client->get("d.get_base_path", $list[0]);
//上传速度
$up_rate = $client->get("d.get_up_rate", $list[0]);
$down_rate = $client->get("d.get_down_rate", $list[0]);
echo $up_rate.'/'.$down_rate.PHP_EOL;
//删除下载
//$client->get("d.erase", $list[0]);
//删除文件
//unlink($filepath);

rpc命令列表：https://github.com/rakshasa/rtorrent/wiki/rTorrent-0.9-Comprehensive-Command-list-(WIP)

centos下epel源可直接安装：

yum install rtorrent

配置文件.rtorrent.rc ：

#下载时每个种子的最大连接数
min_peers = 1
max_peers = 500
#种子下载完成后每个种子最大连接数，-1等同于上面下载时连接数
min_peers_seed = -1
max_peers_seed = -1

#全局最大上传和下载连接数
max_uploads_global = 0
max_downloads_global = 0

#每个种子最大上传和下载连接数
max_uploads = 200
max_downloads = 200

#上传/下载限速，0为不限制
download_rate = 0
upload_rate = 0


check_hash = no
directory = /root/download
session = /root/session

port_random = yes
port_range = 6998-10000



#外出连接加密，如果连接失败转为不加密重试，允许进入连接加密，同时还允许未加密连接进入
#protocol.encryption.set = allow_incoming,try_outgoing,enable_retry 

#只允许进入、外出连接加密和内容加密
protocol.encryption.set = require

#进入、外出连接和内容都必须加密
#protocol.encryption.set = require,require_RC4

encoding_list = utf-8
dht = off
peer_exchange = no
use_udp_trackers = yes

#log.open_file = "rtorrent.log", (cat,/tmp/rtorrent.log)  
#log.add_output = "debug", "rtorrent.log"
#当删除任务时同时删除下载的文件
method.set_key = event.download.erased,delete_erased,"execute=rm,-rf,--,$d.base_path="
schedule = low_diskspace,5,60,close_low_diskspace=100M
schedule = watch_directory,5,5,load_start=/root/watch/*.torrent

在tmux或screen窗口内启动：

mkdir session download watch
rtorrent

将种上传到watch目录自动开始下载，在管理窗口通过上下左右方向键可查看详细信息。
ctrl+q退出，ctrl+d暂停，再按ctrl+d删除，ctrl+s开始。
加密的相关参数，多个值应该和iptables规则相似，从左到右匹配，默认不处理。

# Encryption options, set to none (default) or any combination of the following:
# allow_incoming: allow incoming encrypted connections
# try_outgoing: use encryption for outgoing connections
# require: disable unencrypted handshakes
# require_RC4: also disable plaintext transmission after the initial encrypted handshake
# enable_retry: if the initial outgoing connection fails, retry with encryption turned on if it was off or off if it was on
# prefer_plaintext: choose plaintext when peer offers a choice between plaintext transmission and RC4 encryption, otherwise RC4 will be used