# Written by Bram Cohen
# see LICENSE.txt for license information
from types import StringType,LongType,IntType,ListType,DictType
from re import compile
reg = compile(r'^[^/\\.~][^/\\]*$')
ints = (LongType, IntType)
def check_info(info):
if type(info) != DictType:
raise ValueError, 'bad metainfo - not a dictionary'
pieces = info.get('pieces')
if type(pieces) != StringType or len(pieces) % 20 != 0:
raise ValueError, 'bad metainfo - bad pieces key'
piecelength = info.get('piece length')
if type(piecelength) not in ints or piecelength <= 0:
raise ValueError, 'bad metainfo - illegal piece length'
name = info.get('name')
if type(name) != StringType:
raise ValueError, 'bad metainfo - bad name'
if not reg.match(name):
raise ValueError, 'name %s disallowed for security reasons' % name
if info.has_key('files') == info.has_key('length'):
raise ValueError, 'single/multiple file mix'
if info.has_key('length'):
length = info.get('length')
if type(length) not in ints or length < 0:
raise ValueError, 'bad metainfo - bad length'
else:
files = info.get('files')
if type(files) != ListType:
raise ValueError
for f in files:
if type(f) != DictType:
raise ValueError, 'bad metainfo - bad file value'
length = f.get('length')
if type(length) not in ints or length < 0:
raise ValueError, 'bad metainfo - bad length'
path = f.get('path')
if type(path) != ListType or path == []:
raise ValueError, 'bad metainfo - bad path'
for p in path:
if type(p) != StringType:
raise ValueError, 'bad metainfo - bad path dir'
if not reg.match(p):
raise ValueError, 'path %s disallowed for security reasons' % p
for i in xrange(len(files)):
for j in xrange(i):
if files[i]['path'] == files[j]['path']:
raise ValueError, 'bad metainfo - duplicate path'
def check_message(message):
if type(message) != DictType:
raise ValueError
check_info(message.get('info'))
if type(message.get('announce')) != StringType:
raise ValueError
def check_peers(message):
if type(message) != DictType:
raise ValueError
if message.has_key('failure reason'):
if type(message['failure reason']) != StringType:
raise ValueError
return
peers = message.get('peers')
if type(peers) == ListType:
for p in peers:
if type(p) != DictType:
raise ValueError
if type(p.get('ip')) != StringType:
raise ValueError
port = p.get('port')
if type(port) not in ints or p <= 0:
raise ValueError
if p.has_key('peer id'):
id = p.get('peer id')
if type(id) != StringType or len(id) != 20:
raise ValueError
elif type(peers) != StringType or len(peers) % 6 != 0:
raise ValueError
interval = message.get('interval', 1)
if type(interval) not in ints or interval <= 0:
raise ValueError
minint = message.get('min interval', 1)
if type(minint) not in ints or minint <= 0:
raise ValueError
if type(message.get('tracker id', '')) != StringType:
raise ValueError
npeers = message.get('num peers', 0)
if type(npeers) not in ints or npeers < 0:
raise ValueError
dpeers = message.get('done peers', 0)
if type(dpeers) not in ints or dpeers < 0:
raise ValueError
last = message.get('last', 0)
if type(last) not in ints or last < 0:
raise ValueError
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