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