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Avoid hardcoding packed address lengths.

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This commit is contained in:
Brian May 2015-11-18 20:07:41 +11:00
parent 51eb7862c4
commit 6ebf76a5d8
1 changed files with 9 additions and 5 deletions
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14
sshuttle/methods/pf.py
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@ -97,19 +97,23 @@ def pf_query_nat(family, proto, src_ip, src_port, dst_ip, dst_port):
[proto, family, src_port, dst_port] = [
int(v) for v in [proto, family, src_port, dst_port]]
length = 4 if family == socket.AF_INET else 16
packed_src_ip = socket.inet_pton(family, src_ip)
packed_dst_ip = socket.inet_pton(family, dst_ip)
assert len(packed_src_ip) == len(packed_dst_ip)
length = len(packed_src_ip)
pnl = pfioc_natlook()
pnl.proto = proto
pnl.direction = PF_OUT
pnl.af = family
memmove(addressof(pnl.saddr), socket.inet_pton(pnl.af, src_ip), length)
memmove(addressof(pnl.saddr), packed_src_ip, length)
pnl.sxport.port = socket.htons(src_port)
memmove(addressof(pnl.daddr), socket.inet_pton(pnl.af, dst_ip), length)
memmove(addressof(pnl.daddr), packed_dst_ip, length)
pnl.dxport.port = socket.htons(dst_port)
ioctl(pf_get_dev(), DIOCNATLOOK, (
c_char * sizeof(pnl)).from_address(addressof(pnl)))
ioctl(pf_get_dev(), DIOCNATLOOK,
(c_char * sizeof(pnl)).from_address(addressof(pnl)))
ip = socket.inet_ntop(
pnl.af, (c_char * length).from_address(addressof(pnl.rdaddr)).raw)