/*
?*??$Id:?libnet-example-1.cv?1.1.1.1?2000/05/25?00:28:49?route?Exp?$
?*
?*??libnet?example?code
?*??example?1:??raw?socket?api?/?TCP?packet
?*
?*??Copyright?（c）?1998?-?2001?Mike?D.?Schiffman?
?*??All?rights?reserved.
?*
?*?Redistribution?and?use?in?source?and?binary?forms?with?or?without
?*?modification?are?permitted?provided?that?the?following?conditions
?*?are?met:
?*?1.?Redistributions?of?source?code?must?retain?the?above?copyright
?*????notice?this?list?of?conditions?and?the?following?disclaimer.
?*?2.?Redistributions?in?binary?form?must?reproduce?the?above?copyright
?*????notice?this?list?of?conditions?and?the?following?disclaimer?in?the
?*????documentation?and/or?other?materials?provided?with?the?distribution.
?*
?*?THIS?SOFTWARE?IS?PROVIDED?BY?THE?AUTHOR?AND?CONTRIBUTORS?‘‘AS?IS‘‘?AND
?*?ANY?EXPRESS?OR?IMPLIED?WARRANTIES?INCLUDING?BUT?NOT?LIMITED?TO?THE
?*?IMPLIED?WARRANTIES?OF?MERCHANTABILITY?AND?FITNESS?FOR?A?PARTICULAR?PURPOSE
?*?ARE?DISCLAIMED.??IN?NO?EVENT?SHALL?THE?AUTHOR?OR?CONTRIBUTORS?BE?LIABLE
?*?FOR?ANY?DIRECT?INDIRECT?INCIDENTAL?SPECIAL?EXEMPLARY?OR?CONSEQUENTIAL
?*?DAMAGES?（INCLUDING?BUT?NOT?LIMITED?TO?PROCUREMENT?OF?SUBSTITUTE?GOODS
?*?OR?SERVICES;?LOSS?OF?USE?DATA?OR?PROFITS;?OR?BUSINESS?INTERRUPTION）
?*?HOWEVER?CAUSED?AND?ON?ANY?THEORY?OF?LIABILITY?WHETHER?IN?CONTRACT?STRICT
?*?LIABILITY?OR?TORT?（INCLUDING?NEGLIGENCE?OR?OTHERWISE）?ARISING?IN?ANY?WAY
?*?OUT?OF?THE?USE?OF?THIS?SOFTWARE?EVEN?IF?ADVISED?OF?THE?POSSIBILITY?OF
?*?SUCH?DAMAGE.
?*
?*/

#include?

void?usage（char?*）;

int
main（int?argc?char?**argv）
{
????int?network?packet_size?c;
????u_long?src_ip?dst_ip;
????u_short?src_prt?dst_prt;
????u_char?*cp?*packet;

????printf（“l(fā)ibnet?example?code:\tmodule?1\n\n“）;
????printf（“packet?injection?interface:\traw?socket\n“）;
????printf（“packet?type:\t\t\tTCP?[no?payload]\n“）;

????src_ip??=?0;
????dst_ip??=?0;
????src_prt?=?0;
????dst_prt?=?0;

????while（（c?=?getopt（argc?argv?“d:s:“））?!=?EOF）
????{??????
????????switch?（c）
????????{
????????????/*
?????????????*??We?expect?the?input?to?be?of?the?form?‘ip.ip.ip.ip.port‘.??We
?????????????*??point?cp?to?the?last?dot?of?the?IP?address/port?string?and
?????????????*??then?seperate?them?with?a?NULL?byte.??The?optarg?now?points?to
?????????????*??just?the?IP?address?and?cp?points?to?the?port.
?????????????*/
????????????case?‘d‘:
????????????????if?（!（cp?=?strrchr（optarg?‘.‘）））
????????????????{
????????????????????usage（argv[0]）;
????????????????}
????????????????*cp++?=?0;
????????????????dst_prt?=?（u_short）atoi（cp）;
????????????????if?（!（dst_ip?=?libnet_name_resolve（optarg?LIBNET_RESOLVE）））
????????????????{
????????????????????libnet_error（LIBNET_ERR_FATAL?“Bad?destination?IP?address:?%s\n“?optarg）;
????????????????}
????????????????break;
????????????case?‘s‘:
????????????????if?（!（cp?=?strrchr（optarg?‘.‘）））
????????????????{
????????????????????usage（argv[0]）;
????????????????}
????????????????*cp++?=?0;
?????