Implementation of Arp Sniffer in linux

* ===================================================== ============================================
Coder: Paris-ye
Released on: 1/9/2003
Test on: FIG 9.0
Information:
This is a arp spoof sniffer.
W <--- workstation
B <--- Server or GateWay
M <--- Man in the middle (agent), self IP address
Make:
First you must install "pcap" and "libnet"
Gcc-I/usr/local/include-L/usr/local/lib-o sniffer. c-lpcap-lnet
Usage:
./Sniffer-I [Interface]-M [Self IP]-W [Workstation IP]-S [Server IP]-P [port]
========================================================== ============================================= */
# Include;
# Include;
# Include;
# Include;
# Include;
# Define MAXBUF 1024*4
# Define PCAP_TOUT 5
# Define PROMISC 0
# Define TRUE 1
# Define FALSE 0
/* Ethernet protocol IDs */
# Define ETHERTYPE_PUP 0x0200/* Xerox PUP */
# Define ETHERTYPE_IP: 0x0800/* IP */
# Define ETHERTYPE_ARP 0x0806/* Address resolution */
# Define ETHERTYPE_REVARP 0x8035/* Reverse ARP */
/* This structure defines an ethernet arp header .*/
/* ARP protocol opcodes .*/
# Define ARPOP_REQUEST 1/* ARP request .*/
# Define ARPOP_REPLY 2/* ARP reply .*/
# Define ARPOP_RREQUEST 3/* RARP request .*/
# Define ARPOP_RREPLY 4/* RARP reply .*/
# Define ARPOP_InREQUEST 8/* InARP request .*/
# Define ARPOP_InREPLY 9/* InARP reply .*/
# Define ARPOP_NAK 10/* (ATM) arp nak .*/
/* ARP protocol HARDWARE identifiers .*/
# Define ARPHRD_NETROM 0/* From KA9Q: NET/ROM pseudo .*/
# Define ARPHRD_ETHER 1/* Ethernet 10/100 Mbps .*/
# Define ARPHRD_EETHER 2/* Experimental Ethernet .*/
# Define ARPHRD_AX25 3/* AX.25 Level 2 .*/
# Define ARPHRD_PRONET 4/* PROnet token ring .*/
# Define ARPHRD_CHAOS 5/* Chaosnet .*/
# Define ARPHRD_IEEE802 6/* IEEE 802.2 Ethernet/TR/TB .*/
# Define ARPHRD_ARCNET 7/* ARCnet .*/
# Define ARPHRD_APPLETLK 8/* APPLEtalk .*/
# Define ARPHRD_DLCI 15/* Frame Relay DLCI .*/
# Define ARPHRD_ATM 19/* ATM .*/
# Define ARPHRD_METRICOM 23/* Metricom STRIP (new IANA id ).*/
/* Dummy types for non ARP hardware */
# Define ARPHRD_SLIP 0x256
# Define ARPHRD_CSLIP 0x257
# Define ARPHRD_SLIP6 0x258
# Define ARPHRD_CSLIP6 0x259
# Define ARPHRD_RSRVD 0x260/* Notional KISS type .*/
# Define ARPHRD_ADAPT 0x264
# Define ARPHRD_ROSE 0x270
# Define ARPHRD_X25 0x271/* CCITT X.25 .*/
# Define ARPHDR_HWX25 0x272/* Boards with X.25 in firmware .*/
# Define ARPHRD_PPP 0x512
# Define ARPHRD_CISCO 0x513/* Cisco HDLC .*/
# Define ARPHRD_HDLC ARPHRD_CISCO
# Define ARPHRD_LAPB 0x516/* LAPB .*/
# Define ARPHRD_DDCMP 0x517/* Digitals DDCMP .*/
# Define ARPHRD_RAWHDLC 0x518/* Raw HDLC .*/

# Define ARPHRD_TUNNEL 0x768/* IPIP tunnel .*/
# Define ARPHRD_TUNNEL6 0x769/* IPIP6 tunnel .*/
# Define ARPHRD_FRAD 0x770/* Frame Relay Access Device .*/
# Define ARPHRD_SKIP 0x771/* SKIP vif .*/
# Define ARPHRD_LOOPBACK 0x772/* Loopback device .*/
# Define ARPHRD_LOCALTLK 0x773/* Localtalk device .*/
# Define ARPHRD_FDDI 0x774/* Fiber Distributed Data Interface .*/
# Define ARPHRD_BIF 0x775/* AP1000 BIF .*/
# Define ARPHRD_SIT 0x776/* sit0 device-IPv6-in-IPv4 .*/
# Define ARPHRD_IPDDP 0x777/* IP-in-DDP tunnel .*/
# Define ARPHRD_IPGRE 0x778