track.py

一个多点下载且源码公开的P2P软件

# Written by Bram Cohen
# see LICENSE.txt for license information

from BitTornado.parseargs import parseargs, formatDefinitions
from BitTornado.RawServer import RawServer, autodetect_ipv6, autodetect_socket_style
from BitTornado.HTTPHandler import HTTPHandler, months, weekdays
from BitTornado.parsedir import parsedir
from NatCheck import NatCheck, CHECK_PEER_ID_ENCRYPTED
from BitTornado.BTcrypto import CRYPTO_OK
from T2T import T2TList
from BitTornado.subnetparse import IP_List, ipv6_to_ipv4, to_ipv4, is_valid_ip, is_ipv4
from BitTornado.iprangeparse import IP_List as IP_Range_List
from BitTornado.torrentlistparse import parsetorrentlist
from threading import Event, Thread
from BitTornado.bencode import bencode, bdecode, Bencached
from BitTornado.zurllib import urlopen, quote, unquote
from Filter import Filter
from urlparse import urlparse
from os import rename, getpid
from os.path import exists, isfile
from cStringIO import StringIO
from traceback import print_exc
from time import time, gmtime, strftime, localtime
from BitTornado.clock import clock
from random import shuffle, seed, randrange
from sha import sha
from types import StringType, IntType, LongType, ListType, DictType
from binascii import b2a_hex, a2b_hex, a2b_base64
from string import lower
import sys, os
import signal
import re
import BitTornado.__init__
from BitTornado.__init__ import version, createPeerID
try:
    True
except:
    True = 1
    False = 0
    bool = lambda x: not not x

defaults = [
    ('port', 80, "Port to listen on."),
    ('dfile', None, 'file to store recent downloader info in'),
    ('bind', '', 'comma-separated list of ips/hostnames to bind to locally'),
#    ('ipv6_enabled', autodetect_ipv6(),
    ('ipv6_enabled', 0,
         'allow the client to connect to peers via IPv6'),
    ('ipv6_binds_v4', autodetect_socket_style(),
        'set if an IPv6 server socket will also field IPv4 connections'),
    ('socket_timeout', 15, 'timeout for closing connections'),
    ('save_dfile_interval', 5 * 60, 'seconds between saving dfile'),
    ('timeout_downloaders_interval', 45 * 60, 'seconds between expiring downloaders'),
    ('reannounce_interval', 30 * 60, 'seconds downloaders should wait between reannouncements'),
    ('response_size', 50, 'number of peers to send in an info message'),
    ('timeout_check_interval', 5,
        'time to wait between checking if any connections have timed out'),
    ('nat_check', 3,
        "how many times to check if a downloader is behind a NAT (0 = don't check)"),
    ('log_nat_checks', 0,
        "whether to add entries to the log for nat-check results"),
    ('min_time_between_log_flushes', 3.0,
        'minimum time it must have been since the last flush to do another one'),
    ('min_time_between_cache_refreshes', 600.0,
        'minimum time in seconds before a cache is considered stale and is flushed'),
    ('allowed_dir', '', 'only allow downloads for .torrents in this dir'),
    ('allowed_list', '', 'only allow downloads for hashes in this list (hex format, one per line)'),
    ('allowed_controls', 0, 'allow special keys in torrents in the allowed_dir to affect tracker access'),
    ('multitracker_enabled', 0, 'whether to enable multitracker operation'),
    ('multitracker_allowed', 'autodetect', 'whether to allow incoming tracker announces (can be none, autodetect or all)'),
    ('multitracker_reannounce_interval', 2 * 60, 'seconds between outgoing tracker announces'),
    ('multitracker_maxpeers', 20, 'number of peers to get in a tracker announce'),
    ('aggregate_forward', '', 'format: <url>[,<password>] - if set, forwards all non-multitracker to this url with this optional password'),
    ('aggregator', '0', 'whether to act as a data aggregator rather than a tracker.  If enabled, may be 1, or <password>; ' +
             'if password is set, then an incoming password is required for access'),
    ('hupmonitor', 0, 'whether to reopen the log file upon receipt of HUP signal'),
    ('http_timeout', 60, 
        'number of seconds to wait before assuming that an http connection has timed out'),
    ('parse_dir_interval', 60, 'seconds between reloading of allowed_dir or allowed_file ' +
             'and allowed_ips and banned_ips lists'),
    ('show_infopage', 1, "whether to display an info page when the tracker's root dir is loaded"),
    ('infopage_redirect', '', 'a URL to redirect the info page to'),
    ('show_names', 1, 'whether to display names from allowed dir'),
    ('favicon', '', 'file containing x-icon data to return when browser requests favicon.ico'),
    ('allowed_ips', '', 'only allow connections from IPs specified in the given file; '+
             'file contains subnet data in the format: aa.bb.cc.dd/len'),
    ('banned_ips', '', "don't allow connections from IPs specified in the given file; "+
             'file contains IP range data in the format: xxx:xxx:ip1-ip2'),
    ('only_local_override_ip', 2, "ignore the ip GET parameter from machines which aren't on local network IPs " +
             "(0 = never, 1 = always, 2 = ignore if NAT checking is not enabled)"),
    ('logfile', '', 'file to write the tracker logs, use - for stdout (default)'),
    ('allow_get', 0, 'use with allowed_dir; adds a /file?hash={hash} url that allows users to download the torrent file'),
    ('keep_dead', 0, 'keep dead torrents after they expire (so they still show up on your /scrape and web page)'),
    ('scrape_allowed', 'full', 'scrape access allowed (can be none, specific or full)'),
    ('dedicated_seed_id', '', 'allows tracker to monitor dedicated seed(s) and flag torrents as seeded'),
    ('compact_reqd', 1, "only allow peers that accept a compact response"),
  ]

def statefiletemplate(x):
    if type(x) != DictType:
        raise ValueError
    for cname, cinfo in x.items():
        if cname == 'peers':
            for y in cinfo.values():      # The 'peers' key is a dictionary of SHA hashes (torrent ids)
                if type(y) != DictType:   # ... for the active torrents, and each is a dictionary
                    raise ValueError
                for id, info in y.items(): # ... of client ids interested in that torrent
                    if (len(id) != 20):
                        raise ValueError
                    if type(info) != DictType:  # ... each of which is also a dictionary
                        raise ValueError # ... which has an IP, a Port, and a Bytes Left count for that client for that torrent
                    if type(info.get('ip', '')) != StringType:
                        raise ValueError
                    port = info.get('port')
                    if type(port) not in (IntType,LongType) or port < 0:
                        raise ValueError
                    left = info.get('left')
                    if type(left) not in (IntType,LongType) or left < 0:
                        raise ValueError
                    if type(info.get('supportcrypto')) not in (IntType,LongType):
                        raise ValueError
                    if type(info.get('requirecrypto')) not in (IntType,LongType):
                        raise ValueError
        elif cname == 'completed':
            if (type(cinfo) != DictType): # The 'completed' key is a dictionary of SHA hashes (torrent ids)
                raise ValueError          # ... for keeping track of the total completions per torrent
            for y in cinfo.values():      # ... each torrent has an integer value
                if type(y) not in (IntType,LongType):
                    raise ValueError      # ... for the number of reported completions for that torrent
        elif cname == 'allowed':
            if (type(cinfo) != DictType): # a list of info_hashes and included data
                raise ValueError
            if x.has_key('allowed_dir_files'):
                adlist = [z[1] for z in x['allowed_dir_files'].values()]
                for y in cinfo.keys():        # and each should have a corresponding key here
                    if not y in adlist:
                        raise ValueError
        elif cname == 'allowed_dir_files':
            if (type(cinfo) != DictType): # a list of files, their attributes and info hashes
                raise ValueError
            dirkeys = {}
            for y in cinfo.values():      # each entry should have a corresponding info_hash
                if not y[1]:
                    continue
                if not x['allowed'].has_key(y[1]):
                    raise ValueError
                if dirkeys.has_key(y[1]): # and each should have a unique info_hash
                    raise ValueError
                dirkeys[y[1]] = 1
            

alas = 'your file may exist elsewhere in the universe\nbut alas, not here\n'

local_IPs = IP_List()
local_IPs.set_intranet_addresses()


def isotime(secs = None):
    if secs == None:
        secs = time()
    return strftime('%Y-%m-%d %H:%M UTC', gmtime(secs))

http_via_filter = re.compile(' for ([0-9.]+)\Z')

def _get_forwarded_ip(headers):
    header = headers.get('x-forwarded-for')
    if header:
        try:
            x,y = header.split(',')
        except:
            return header
        if is_valid_ip(x) and not local_IPs.includes(x):
            return x
        return y
    header = headers.get('client-ip')
    if header:
        return header
    header = headers.get('via')
    if header:
        x = http_via_filter.search(header)
        try:
            return x.group(1)
        except:
            pass
    header = headers.get('from')
    #if header:
    #    return header
    #return None
    return header

def get_forwarded_ip(headers):
    x = _get_forwarded_ip(headers)
    if not is_valid_ip(x) or local_IPs.includes(x):
        return None
    return x

def compact_peer_info(ip, port):
    try:
        s = ( ''.join([chr(int(i)) for i in ip.split('.')])
              + chr((port & 0xFF00) >> 8) + chr(port & 0xFF) )
        if len(s) != 6:
            raise ValueError
    except:
        s = ''  # not a valid IP, must be a domain name
    return s

class Tracker:
    def __init__(self, config, rawserver):
        self.config = config
        self.response_size = config['response_size']
        self.dfile = config['dfile']
        self.natcheck = config['nat_check']
        favicon = config['favicon']
        self.parse_dir_interval = config['parse_dir_interval']
        self.favicon = None
        if favicon:
            try:
                h = open(favicon,'r')
                self.favicon = h.read()
                h.close()
            except:
                print "**warning** specified favicon file -- %s -- does not exist." % favicon
        self.rawserver = rawserver
        self.cached = {}    # format: infohash: [[time1, l1, s1], [time2, l2, s2], ...]
        self.cached_t = {}  # format: infohash: [time, cache]
        self.times = {}
        self.state = {}
        self.seedcount = {}

        self.allowed_IPs = None
        self.banned_IPs = None
        if config['allowed_ips'] or config['banned_ips']:
            self.allowed_ip_mtime = 0
            self.banned_ip_mtime = 0
            self.read_ip_lists()
                
        self.only_local_override_ip = config['only_local_override_ip']
        if self.only_local_override_ip == 2:
            self.only_local_override_ip = not config['nat_check']

        if CHECK_PEER_ID_ENCRYPTED and not CRYPTO_OK:
            print ('**warning** crypto library not installed,' +
                   ' cannot completely verify encrypted peers')

        if exists(self.dfile):
            try:
                h = open(self.dfile, 'rb')
                ds = h.read()
                h.close()
                tempstate = bdecode(ds)
                if not tempstate.has_key('peers'):
                    tempstate = {'peers': tempstate}
                statefiletemplate(tempstate)
                self.state = tempstate
            except:
                print '**warning** statefile '+self.dfile+' corrupt; resetting'
        self.downloads = self.state.setdefault('peers', {})
        self.completed = self.state.setdefault('completed', {})

        self.becache = {}
        ''' format: infohash: [[l0, s0], [l1, s1], ...]
                l0,s0 = compact, not requirecrypto=1
                l1,s1 = compact, only supportcrypto=1
                l2,s2 = [compact, crypto_flag], all peers
            if --compact_reqd 0:
                l3,s3 = [ip,port,id]
                l4,l4 = [ip,port] nopeerid
        '''
        if config['compact_reqd']:
            x = 3
        else:
            x = 5
        self.cache_default = [({},{}) for i in xrange(x)]
        for infohash, ds in self.downloads.items():
            self.seedcount[infohash] = 0
            for x,y in ds.items():
                ip = y['ip']
                if ( (self.allowed_IPs and not self.allowed_IPs.includes(ip))
                     or (self.banned_IPs and self.banned_IPs.includes(ip)) ):
                    del ds[x]
                    continue
                if not y['left']:
                    self.seedcount[infohash] += 1
                if y.get('nat',-1):
                    continue