我已经仔细研究了这个答案,但我似乎只能找到适合你的软件。有人知道如何在python中执行此操作吗?
答案 0 :(得分:28)
我编写了一段python代码,用于验证下载文件的哈希值,以及 .torrent文件中的内容。假设您想检查下载是否有损坏,您可能会觉得这很有用。
您需要bencode package才能使用此功能。 Bencode是.torrent文件中使用的序列化格式。它可以像JSON一样封送列表,字典,字符串和数字。
代码获取info['pieces']
字符串中包含的哈希值:
torrent_file = open(sys.argv[1], "rb")
metainfo = bencode.bdecode(torrent_file.read())
info = metainfo['info']
pieces = StringIO.StringIO(info['pieces'])
该字符串包含一系列20字节的哈希值(每件一个)。然后将这些哈希值与磁盘文件的哈希值进行比较。
此代码中唯一复杂的部分是处理多文件种子,因为单个torrent piece 可以跨越多个文件(内部BitTorrent将多文件下载视为单个连续文件)。我正在使用生成器函数pieces_generator()
来抽象它。
您可能需要阅读BitTorrent spec以了解详情。
完整代码:
import sys, os, hashlib, StringIO, bencode
def pieces_generator(info):
"""Yield pieces from download file(s)."""
piece_length = info['piece length']
if 'files' in info: # yield pieces from a multi-file torrent
piece = ""
for file_info in info['files']:
path = os.sep.join([info['name']] + file_info['path'])
print path
sfile = open(path.decode('UTF-8'), "rb")
while True:
piece += sfile.read(piece_length-len(piece))
if len(piece) != piece_length:
sfile.close()
break
yield piece
piece = ""
if piece != "":
yield piece
else: # yield pieces from a single file torrent
path = info['name']
print path
sfile = open(path.decode('UTF-8'), "rb")
while True:
piece = sfile.read(piece_length)
if not piece:
sfile.close()
return
yield piece
def corruption_failure():
"""Display error message and exit"""
print("download corrupted")
exit(1)
def main():
# Open torrent file
torrent_file = open(sys.argv[1], "rb")
metainfo = bencode.bdecode(torrent_file.read())
info = metainfo['info']
pieces = StringIO.StringIO(info['pieces'])
# Iterate through pieces
for piece in pieces_generator(info):
# Compare piece hash with expected hash
piece_hash = hashlib.sha1(piece).digest()
if (piece_hash != pieces.read(20)):
corruption_failure()
# ensure we've read all pieces
if pieces.read():
corruption_failure()
if __name__ == "__main__":
main()
答案 1 :(得分:17)
这里我是如何从torrent文件中提取HASH值的:
#!/usr/bin/python
import sys, os, hashlib, StringIO
import bencode
def main():
# Open torrent file
torrent_file = open(sys.argv[1], "rb")
metainfo = bencode.bdecode(torrent_file.read())
info = metainfo['info']
print hashlib.sha1(bencode.bencode(info)).hexdigest()
if __name__ == "__main__":
main()
与运行命令相同:
transmissioncli -i test.torrent 2>/dev/null | grep "^hash:" | awk '{print $2}'
希望,这有助于:)
答案 2 :(得分:-2)