typedef unsigned char      uint8_t;		// BYTE
typedef unsigned short     uint16_t;		// WORD
typedef unsigned int       uint32_t;		// DWORD

typedef struct tagPCAPFILEHDR {			// 24 байта
    uint32_t magic;
    uint16_t version_major;
    uint16_t version_minor;
    uint32_t thiszone;
    uint32_t sigfigs;
    uint32_t snap_len;
    uint32_t linktype;
} PCAPFILEHDR;

typedef struct tagtimeval {
    uint32_t sec;
    uint32_t usec;
} timeval;

typedef struct tagPCAPPKTHDR {
    timeval ts;
    uint32_t caplen;
    uint32_t len;
} PCAPPKTHDR;

typedef struct tagIPHDR {
    uint8_t ihl:4,
    version:4;
    uint8_t tos;
    uint16_t tot_len;
    uint16_t id;
    uint16_t frag_off;
    uint8_t ttl;
    uint8_t protocol;
    uint16_t check;
    uint32_t saddr;
    uint32_t daddr;
} IPHDR, *PIPHDR;

typedef struct tagICMPHDR {
    uint8_t type;
    uint8_t code;
    uint16_t checksum;
    union {
        struct {
            uint16_t id;
            uint16_t sequence;
        } echo;
        uint32_t gateway;
        struct {
            uint16_t reserved;
            uint16_t mtu;
        } frag;
    } un;
} ICMPHDR, *PICMPHDR;

typedef struct tagTCPHDR {
    uint16_t source;
    uint16_t dest;
    uint32_t seq;
    uint32_t ack_seq;
    uint8_t res;
    uint8_t flags;
    uint16_t window;
    uint16_t check;
    uint16_t urg_ptr;
} TCPHDR, *PTCPHDR;

typedef struct tagEVENT {
    IPHDR ip;
    union {
        ICMPHDR icmp;
        TCPHDR tcp;
//        UDPHDR udp
    };
    uint8_t rezerved[1024];
} EVENT, *PEVENT;