Hi, It seems that your bug is "sizeof(pkt_data_iface1_2) is the buffer size." sizeof is an operator that returns the size of the type and not the length of the buffer. http://msdn.microsoft.com/en-us/library/4s7x1k91%28VS.71%29.aspx
You should use the length of the buffer you want to send. When you receive a packet, you also receive a packet header (pcap_pkthdr), which contains the length of the packet buffer (caplen). You should use this length and you should not use the sizeof operator. By the way, the sizeof operator returns 4 when you use it on an int type or a pointer type, so this is why you got only 4 bytes. I hope this helps, Boaz. Try Pcap.Net in http://pcapdotnet.codeplex.com On Thu, Feb 25, 2010 at 12:39, Valpondi Hereza, Fabio < [email protected]> wrote: > Hi, > > I am programming a kind of bridge device, reading from one interface, and > forwarding the frame through another interface. Also in the inverse way. > The frame capture using "pcap_loop" happens without problems (I print the > frame contents as well as length for debugging purposes). > > The problem is when I try to send the interface via the other interface. I > use the following call for the pcap_sendpacket function: > *pcap_sendpacket(iface2, pkt_data_iface1_2,sizeof(pkt_data_iface1_2));* > > *iface2* is the outgoing interface > *pkt_data_iface1_2* is the frame received on Interface 1 and being sent > over Interface 2 > *sizeof(pkt_data_iface1_2)* is the buffer size. > > Only the first four bytes of the frame are sent. The device that uses > wireshark to analyze the frames sent by my program, shows them as malformed. > I also tried for the size parameter *sizeof(hear_iface1_2->caplen)* or the > *pcap_inject* function: *The result was the same.* > > My question is: does anybody know, why only the first four bytes are sent? > > > Thanks a lot for your help! > > Best regards, > Fabio Valpondi > > _______________________________________________ > Winpcap-users mailing list > [email protected] > https://www.winpcap.org/mailman/listinfo/winpcap-users > >
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