struct sniff_ethernet { u_char ether_dhost[ETHER_ADDR_LEN]; /* destination host address */ u_char ether_shost[ETHER_ADDR_LEN]; /* source host address */ u_short ether_type; /* IP? ARP? RARP? etc */ }; /* IP header */ struct sniff_ip { u_char ip_vhl; /* version << 4 | header length >> 2 */ u_char ip_tos; /* type of service */ u_short ip_len; /* total length */ u_short ip_id; /* identification */ u_short ip_off; /* fragment offset field */ #define IP_RF 0x8000 /* reserved fragment flag */ #define IP_DF 0x4000 /* dont fragment flag */ #define IP_MF 0x2000 /* more fragments flag */ #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ u_char ip_ttl; /* time to live */ u_char ip_p; /* protocol */ u_short ip_sum; /* checksum */ struct in_addr ip_src,ip_dst; /* source and dest address */ }; #define IP_HL(ip) (((ip)->ip_vhl) & 0x0f) #define IP_V(ip) (((ip)->ip_vhl) >> 4) /* TCP header */ typedef u_int tcp_seq; struct sniff_tcp { u_short th_sport; /* source port */ u_short th_dport; /* destination port */ tcp_seq th_seq; /* sequence number */ tcp_seq th_ack; /* acknowledgement number */ u_char th_offx2; /* data offset, rsvd */ #define TH_OFF(th) (((th)->th_offx2 & 0xf0) >> 4) u_char th_flags; #define TH_FIN 0x01 #define TH_SYN 0x02 #define TH_RST 0x04 #define TH_PUSH 0x08 #define TH_ACK 0x10 #define TH_URG 0x20 #define TH_ECE 0x40 #define TH_CWR 0x80 #define TH_FLAGS (TH_FIN|TH_SYN|TH_RST|TH_ACK|TH_URG|TH_ECE|TH_CWR) u_short th_win; /* window */ u_short th_sum; /* checksum */ u_short th_urp; /* urgent pointer */ }; void got_packet(u_char *args, const struct pcap_pkthdr *header, const u_char *packet) { const struct sniff_ethernet *ethernet; /* The ethernet header [1] */ const struct sniff_ip *ip; /* The IP header */ const struct sniff_tcp *tcp; /* The TCP header */ const char *payload; /* Packet payload */ int size_ip; int size_tcp; int size_payload; /*if(source ip==destination ip) then printf("It's Land attack");*/ How to do this? }
struct in_addr ip_src,ip_dst;
var
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