help using pcap library to sniff packets

Question

i am using pcap sample codes to create my own sniffer. i downloaded their sample sniffer and its working on windows but not on linux. i am using gcc compiler on both machines, and i have only pcap.h included.
the error is : dereferencing pointer to incomplete type.
the netmask is causing the error. the netmask is the mask of the first address of the interface.

u_int netmask=netmask((struct sockaddr_in*)d->addresses->netmask))->sin_addr.S_un.S_addr;

any solutions?

http://yuba.stanford.edu/~casado/pcap/ might also interest you. — , Mar 20 '10 at 09:22
structsockaddr_in -- Aren't you missing a space between struct and sockaddr_in? — Roman Dmitrienko, Mar 20 '10 at 09:51

score 0 · Accepted Answer · answered Mar 21 '10 at 09:29

0

The compiler indicating that it doesn't have the definition of struct sockaddr_in in scope, so it can't look inside such a structure. On Linux that struct is defined in this header, which you will need to include:

#include <netinet/in.h>

answered Mar 21 '10 at 09:29

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help using pcap library to sniff packets

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