typedef SilcBool
    (*SilcDebugHexdumpCb)(char *file, char *function, int line,
                          unsigned char *data,
                          SilcUInt32 data_len,
                          char *message, void *context;

    The hexdump logging callback function.  The default behaviour is to
    print a formatted hexdump to stderr, and is commonly what you would
    like it to be.  `file', `function', and `line' are the corresponding
    offsets in the source files.  `data' is the begin of the buffer that
    should be hexdumped, which is `data_len' bytes long.

    The `message' parameter points to a null-terminated buffer containing
    the received message, while `context' is the caller-specified context.
    The message must not be modified or freed by the callback function.
    If the function returns TRUE, SilcLog will assume the message as handled
    and won't run its default handler.

    silc_debug_hexdump, silc_log_set_debug_callbacks