python vpn server & client.
server: eth0: 192.168.0.192/24, listen on eth0 23456, communication with tcp tun0: 192.168.10.1/24
client: eth0: 192.168.2.108/24 tun0: 192.168.10.2/24 ioctl a tun device; set 192.168.0.1/24 to this tun; connect to heruilong1988.oicp.net 23456, establish connection, large conn with heartbeat
TUNSETIFF = 0x400454ca TUNSETOWNER = TUNSETIFF + 2 IFF_TUN = 0x0001 IFF_NO_PI = 0x1000
tun = open('/dev/net/tun', 'r+b')
ifr = struct.pack('16sH', 'tun%d', IFF_TUN | IFF_NO_PI) fcntl.ioctl(tun, TUNSETIFF, ifr)
fcntl.ioctl(tun, TUNSETOWNER, 1000) print ifr return tun.fileno()
Usage: vpn -s 192.168.10.1 255.255.255.0
vpn -c 192.168.10.2 255.255.255.0 -r office.server.org 23456
1111 1111 1111 1111 1111 1111 0000 0000 1100 0000 1010 1000 0000 1010 0000 0010
