Sample code of dhcp client to send dhcp discover, request and inform

參考 Implement DHCP client

增加dhcp request and inform packet的發送功能

dhcp.c

http://pastie.org/pastes/8294244/text

build on Ubuntu 12.04.1 with gcc 4.6.3
gcc dhcp.c
./a.out
輸入1發送dhcp discover
輸入3發送dhcp request
輸入8發送dhcp inform