55 lines
1.1 KiB
Python
Executable File
55 lines
1.1 KiB
Python
Executable File
#!/usr/bin/env python3
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import pytun
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import struct
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import ipaddress
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class IpHeader:
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def __init__(self, raw):
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self.ver_ihl, \
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self.tos, \
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self.total_length, \
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self.ident, \
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self.flags_fragoffset, \
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self.ttl, \
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self.proto, \
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self.chksum, \
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src, \
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dst, \
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self.opt1, \
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self.opt2, \
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self.pad = struct.unpack('>BBHHHBBHIIHBB', raw)
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self.src = ipaddress.IPv4Address(src)
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self.dst = ipaddress.IPv4Address(dst)
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def main():
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tun_iface = pytun.TunTapDevice()
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print(tun_iface.name)
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tun_iface.addr = '10.0.0.1'
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tun_iface.dstaddr = '10.0.0.2'
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tun_iface.netmask = '255.255.255.0'
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tun_iface.mtu = 1500
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tun_iface.up()
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while True:
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buf = tun_iface.read(tun_iface.mtu)
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flags = buf[:2]
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proto = buf[2:4]
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if proto != b'\x08\x00':
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continue
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ip_header = IpHeader(buf[4:28])
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body = buf[28:]
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print(ip_header.src, '→', ip_header.dst, 'len: %d' % ip_header.total_length)
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if __name__ == '__main__':
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main()
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