static __inline __u32 infer_http1_message()

in bpf/include/protocol_analyzer.h [31:72]

• 40 lines of code
• 50 McCabe index (conditional complexity)

static __inline __u32 infer_http1_message(const char* buf, size_t count) {
    if (count < 16) {
        return CONNECTION_MESSAGE_TYPE_UNKNOWN;
    }
    // response
    if (buf[0] == 'H' && buf[1] == 'T' && buf[2] == 'T' && buf[3] == 'P') {
        return CONNECTION_MESSAGE_TYPE_RESPONSE;
    }
    // request
    if (buf[0] == 'G' && buf[1] == 'E' && buf[2] == 'T') {
        return CONNECTION_MESSAGE_TYPE_REQUEST;
    }
    if (buf[0] == 'P' && buf[1] == 'O' && buf[2] == 'S' && buf[3] == 'T') {
        return CONNECTION_MESSAGE_TYPE_REQUEST;
    }
    if (buf[0] == 'O' && buf[1] == 'P' && buf[2] == 'T' && buf[3] == 'I' && buf[4] == 'O'
        && buf[5] == 'N' && buf[6] == 'S')
    {
        return CONNECTION_MESSAGE_TYPE_REQUEST;
    }
    if (buf[0] == 'H' && buf[1] == 'E' && buf[2] == 'A' && buf[3] == 'D') {
        return CONNECTION_MESSAGE_TYPE_REQUEST;
    }
    if (buf[0] == 'P' && buf[1] == 'U' && buf[2] == 'T') {
        return CONNECTION_MESSAGE_TYPE_REQUEST;
    }
    if (buf[0] == 'D' && buf[1] == 'E' && buf[2] == 'L' && buf[3] == 'E' && buf[4] == 'T' && buf[5] == 'E') {
        return CONNECTION_MESSAGE_TYPE_REQUEST;
    }
    if (buf[0] == 'C' && buf[1] == 'O' && buf[2] == 'N' && buf[3] == 'N' && buf[4] == 'E'
        && buf[5] == 'C' && buf[6] == 'T')
    {
        return CONNECTION_MESSAGE_TYPE_REQUEST;
    }
    if (buf[0] == 'T' && buf[1] == 'R' && buf[2] == 'A' && buf[3] == 'C' && buf[4] == 'E') {
        return CONNECTION_MESSAGE_TYPE_REQUEST;
    }
    if (buf[0] == 'P' && buf[1] == 'A' && buf[2] == 'T' && buf[3] == 'C' && buf[4] == 'H') {
        return CONNECTION_MESSAGE_TYPE_REQUEST;
    }
    return CONNECTION_MESSAGE_TYPE_UNKNOWN;
}