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1.socket(AF_INET, SOCK_RAW, IPPROTO_TCP|IPPROTO_UDP|IPPROTO_ICMP)·¢ËͽÓÊÕipÊý¾Ý°ü
2.socket(PF_PACKET, SOCK_RAW, htons(ETH_P_IP|ETH_P_ARP|ETH_P_ALL))·¢ËͽÓÊÕÒÔÌ«ÍøÊý¾ÝÖ¡
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Ê×ÏÈ,Íø¿¨¶Ô¸ÃÊý¾ÝÖ¡½øÐÐÓ²¹ýÂË(¸ù¾ÝÍø¿¨µÄģʽ²»Í¬»áÓв»Í¬µÄ¶¯×÷,Èç¹ûÉèÖÃÁËpromisc»ìÔÓģʽµÄ»°,Ôò²»×öÈκιýÂËÖ±½Ó½»¸øÏÂÒ»²ãÊäÈëÀý³Ì,·ñÔò·Ç±¾»úmac»òÕ߹㲥mac»á±»Ö±½Ó¶ªÆú).°´ÕÕÉÏÃæµÄÀý×Ó,Èç¹û³É¹¦µÄ»°,»á½øÈëipÊäÈëÀý³Ì.µ«ÊÇÔÚ½øÈëipÊäÈëÀý³Ì֮ǰ,ϵͳ»á¼ì²éϵͳÖÐÊÇ·ñÓÐͨ¹ýsocket(AF_PACKET, SOCK_RAW, ..)´´½¨µÄÌ×½Ó×Ö.Èç¹ûÓеĻ°²¢ÇÒЭÒéÏà·û,ÔÚÕâ¸öÀý×ÓÖоÍÊÇÐèÒªETH_P_IP»òÕßETH_P_ALLÀàÐÍ.ϵͳ¾Í¸øÿ¸öÕâÑùµÄsocket½ÓÊÕ»º³åÇø·¢ËÍÒ»¸öÊý¾ÝÖ¡¿½±´.È»ºó½øÈëÏÂÒ»²½.
 
Æä´Î,½øÈëÁËipÊäÈëÀý³Ì(ip²ã»á¶Ô¸ÃÊý¾Ý°ü½øÐÐÈí¹ýÂË,¾ÍÊǼì²éУÑé»òÕ߶ªÆú·Ç±¾»úip»òÕ߹㲥ipµÄÊý¾Ý°üµÈ,¾ßÌåÒª²Î¿¼Ô´´úÂë),Àý×ÓÖоÍÊÇÈç¹û³É¹¦µÄ»°»á½øÈëudpÊäÈëÀý³Ì.µ«ÊÇÔÚ½»¸øudpÊäÈëÀý³Ì֮ǰ,ϵͳ»á¼ì²éϵͳÖÐÊÇ·ñÓÐͨ¹ýsocket(AF_INET, SOCK_RAW, ..)´´½¨µÄÌ×½Ó×Ö.Èç¹ûÓеĻ°²¢ÇÒЭÒéÏà·û,ÔÚÕâ¸öÀý×ÓÖоÍÊÇÐèÒªIPPROTO_UDPÀàÐÍ.ϵͳ¾Í¸øÿ¸öÕâÑùµÄsocket½ÓÊÕ»º³åÇø·¢ËÍÒ»¸öÊý¾ÝÖ¡¿½±´.È»ºó½øÈëÏÂÒ»²½.
 
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ps:Èç¹ûУÑéºÍ³ö´íµÄ»°,Äں˻áÖ±½Ó¶ªÆú¸ÃÊý¾Ý°üµÄ.¶ø²»»á¿½±´¸øsock_rawµÄÌ×½Ó×Ö,ÒòΪУÑéºÍ¶¼³ö´íÁË,Êý¾Ý¿Ï¶¨ÓÐÎÊÌâµÄ°üÀ¨ËùÓÐÐÅÏ¢¶¼Ã»ÓÐÒâÒåÁË.
 
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1. socket(AF_INET, SOCK_RAW, IPPROTO_UDP);
ÄÜ:¸ÃÌ×½Ó×Ö¿ÉÒÔ½ÓÊÕЭÒéÀàÐÍΪ(tcp udp icmpµÈ)·¢Íù±¾»úµÄipÊý¾Ý°ü,´ÓÉÏÃæ¿´µÄ¾ÍÊÇ20+8+100.
²»ÄÜ:²»ÄÜÊÕµ½·Ç·¢Íù±¾µØipµÄÊý¾Ý°ü(ipÈí¹ýÂ˻ᶪÆúÕâЩ²»ÊÇ·¢Íù±¾»úipµÄÊý¾Ý°ü).
²»ÄÜ:²»ÄÜÊÕµ½´Ó±¾»ú·¢ËͳöÈ¥µÄÊý¾Ý°ü.
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2. socket(PF_PACKET, SOCK_RAW, htons(x)); 
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