Reply To: ICMP interception at TDI level

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#5684
Taras
Participant

    May be two case:
    1) app uses Icmpapi. (for example ping.exe). Then
    /Device/ip get IRP_MJ_INTERNAL_DEVICE_CONTROL
    or IRP_MJ_DEVICE_CONTROL
    MinorFunction = 0
    IOCTL = 0x120000

    and parameter:

    typedef struct __ICMP_ECHO_REQUEST {
    unsigned long Address;
    unsigned long Timeout;
    unsigned short DataOffset;
    unsigned short DataSize;
    unsigned char OptionsValid;
    unsigned char Ttl;
    unsigned char Tos;
    unsigned char Flags;
    unsigned short OptionsOffset;
    unsigned char OptionsSize;
    unsigned char Padding;
    } ICMP_ECHO_REQUEST, *PICMP_ECHO_REQUEST;
    you should intercept such IRPs

    2) app can use raw sockets. In such case you should hijack raw traffic.