TCP flags issue

[sajjad purmohseni <spurmohseni () yahoo com>]

Hi all



As you know TCP has 9 flags. But as you see TCP flags of snort is 8 bits defined in sf_snort_packet.h file:
typedef struct _TCPHeader{...    uint8_t flags;
...} TCPHeader;

also predefinded flags are 9 bits as must be:
#define TCPHEADER_FIN  0x01#define TCPHEADER_SYN  0x02...
Now I am confused if I want to check TCP_SYN flag; how to do that. I have used this but it doesn't return correct 
answer:
if (packet->tcp_header->flags & TCPHEADER_SYN){    ...} Can anybody guide me about this issue? Thank you.
---- kind regards;Sajad Pourmohseni 



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