English
- #include <sys/socket.h>
- #ifdef LINUX
- #include <features.h> /* for the glibc version number */
- #if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 1
- #include <netpacket/packet.h>
- #include <net/ethernet.h> /* the L2 protocols */
- #else
- #include <asm/types.h>
- #include <linux/if_packet.h>
- #include <linux/if_ether.h> /* The L2 protocols */
- #ifdef HAVE_NET_ETHERNET_H
- #include <net/ethernet.h>
- #endif
- #endif
- #endif
- #ifndef OPENBSD
- #include <net/if_arp.h>
- #endif
- #include <sys/types.h>
- #include <netinet/in_systm.h>
- #include <net/if.h>
- #include <netdb.h>
- #include <netinet/tcp.h>
- #include <netinet/in.h>
- #include <netinet/ip.h>
- #include <netinet/ip_icmp.h>
- #include <arpa/inet.h>
- typedef struct {
- char dest_mac[6]; // dest ethernet address
- char source_mac[6]; // source ethernet address
- u_short type; // type of packet
- } ETH_header;
- typedef struct {
- u_short hw_type; // hardware type
- u_short proto_type; // protocol type
- char ha_len; // hardware address len
- char pa_len; // protocol address len
- u_short opcode; // arp opcode
- char source_add[6]; // source mac
- char source_ip[4]; // source ip
- char dest_add[6]; // dest mac
- char dest_ip[4]; // dest ip
- } ARP_header;
- typedef struct {
- #ifdef HAVE_MACHINE_LIL
- u_char h_len:4; // header len
- u_char version:4; // ip version
- #endif
- #ifdef HAVE_MACHINE_BIG
- u_char version:4; // ip version
- u_char h_len:4; // header len
- #endif
- u_char tos; // type of service
- u_short t_len; // total len
- u_short ident; // ip ident
- u_short frag_and_flags; // fragments and flags
- u_char ttl; // time to live
- u_char proto; // transport protocol
- u_short checksum; // IP checksum
- u_long source_ip; // source ip
- u_long dest_ip; // destination ip
- } IP_header;
- typedef struct {
- u_char type; // icmp type
- u_char code; // type sub code
- u_short checksum; // ones complement checksum of struct
- union
- {
- struct
- {
- u_short id; // ident
- u_short seq; // sequence number
- } echo;
- u_long gateway; // gateway address
- struct
- {
- u_short unused;
- u_short mtu;
- } frag; // path mtu discovery
- } un;
- } ICMP_header;
- typedef struct
- {
- u_short source; // source port
- u_short dest; // destination port
- u_long seq; // sequence number
- u_long ack_seq; // acknowledgement number
- #ifdef HAVE_MACHINE_LIL
- u_char unused:4; // unused
- u_char doff:4; // data offset
- #endif
- #ifdef HAVE_MACHINE_BIG
- u_char doff:4; // data offset
- u_char unused:4; // unused
- #endif
- u_char flags; // tcp flags
- u_short window; // window
- u_short checksum; // checksum
- u_short urg_ptr; // urgent pointer
- } TCP_header;
- typedef struct
- {
- u_short source; // source port
- u_short dest; // destination port
- u_short len; // packet length
- u_short checksum; // checksum
- } UDP_header;
- #define MAX_PACKET_SIZE 0xffff
- #define ETH_HEADER 0xe // Etherner header: 14 bytes
- #define ARP_HEADER 0x1c // ARP header: 28 bytes
- #define IP_HEADER 0x14 // IP header: 20 bytes
- #define ICMP_HEADER 0x8 // ICMP header: 8 bytes
- #define TCP_HEADER 0x14 // TCP header: 20 bytes
- #define UDP_HEADER 0x8 // UDP header: 8 bytes
- #define TH_FIN 0x01 // TCP Flags
- #define TH_SYN 0x02
- #define TH_RST 0x04
- #define TH_PSH 0x08
- #define TH_ACK 0x10
- #define TH_URG 0x20
- #ifndef IP_OFFMASK
- #define IP_OFFMASK 0x1fff
- #endif
- #ifndef SOL_PACKET // glibc 2.1 bug
- #define SOL_PACKET 263
- #endif
- #ifndef ETH_P_IP
- #define ETH_P_IP 0x0800
- #endif
- #ifndef ETH_P_ARP
- #define ETH_P_ARP 0x0806
- #endif
- #ifndef MSG_TRUNC
- #define MSG_TRUNC 0x20
- #endif
- #ifndef ETHER_ADDR_LEN
- #define ETHER_ADDR_LEN 6
- #endif
- #ifndef PACKET_HOST
- #define PACKET_HOST 0
- #endif
- #ifndef ICMP_DEST_UNREACH
- #define ICMP_DEST_UNREACH 3
- #endif
- #ifndef ICMP_SOURCE_QUENCH
- #define ICMP_SOURCE_QUENCH 4
- #endif
- #ifdef HAVE_MACHINE_LIL
- #define ptohs(x) *(u_short *)(x)
- #define ptohl(x) *(u_long *)(x)
- #endif
- #ifdef HAVE_MACHINE_BIG
- #define ptohs(x) ( (u_short)
- ((u_short)*((u_char *)p+1)<<8|
- (u_short)*((u_char *)p+0)<<0)
- )
- #define ptohl(x) ( (u_int32_t)*((u_char *)p+3)<<24|
- (u_int32_t)*((u_char *)p+2)<<16|
- (u_int32_t)*((u_char *)p+1)<<8|
- (u_int32_t)*((u_char *)p+0)<<0
- )
- #endif
- /* EOF */
