Hello, I try to send a TCP packet via jpcap api (I'm not using net.sourceforge.jpcap API)
here my code:
byte [] options ={(byte)0x02, (byte)0x04, (byte)0x05, (byte)0xB4};
TCPPacket p =new TCPPacket(....);
p.option = options;
sender.sendPacket(p);
when I spy the TCP packets with wireshark (etherreal), there is no option bytes in my packet ?
Do you have an idea ?
kind regards,
Manu
Hi and sorry for my delay answer.
I'm using jpcap api found here : http://netresearch.ics.uci.edu/kfujii/jpcap/doc/index.html
I have debug the native function and I can see that in jpcap library (packet_tcp.c, function set_tcp), the TCP option field is not managed, when I have checked into netinet/tcp.h the structure of tcp header is like that:
struct tcphdr {
u_shortth_sport;/* source port */
u_shortth_dport;/* destination port */
tcp_seqth_seq;/* sequence number */
tcp_seqth_ack;/* acknowledgement number */
#if BYTE_ORDER == LITTLE_ENDIAN
u_charth_x2:4,/* (unused) */
th_off:4;/* data offset */
#endif
#if BYTE_ORDER == BIG_ENDIAN
u_charth_off:4,/* data offset */
th_x2:4;/* (unused) */
#endif
u_charth_flags;
#defineTH_FIN0x01
#defineTH_SYN0x02
#defineTH_RST0x04
#defineTH_PUSH0x08
#defineTH_ACK0x10
#defineTH_URG0x20
u_shortth_win;/* window */
u_shortth_sum;/* checksum */
u_shortth_urp;/* urgent pointer */
};
but I don't know how the option field is managed, may be I need to change the struct to include option field...
Any suggestions ?
bye.
