Hi
I have written a simple packet capture code as
below.
I am getting blocked for ever in pcap_next though i
have given a timeout in pcap_open_live.
I am not getting the printf statement before pcap_next
too,looks strange.
pcap_next waits indefinitely,though i am pinging the
machine,pcap should also be capturing ICMP packets.
But if i comment pcap_next i get all the printf
statements.
I tried even with pcap_loop,doesnt seem to work.
I have read almost all the documents in tcpdump.org
can anyone tell me whether this code will work,or any
clues,as i am trying to write a sniffer code.
#include <stdio.h>
#include <netinet/in.h>
#include <pcap/pcap.h>
int main()
{
char* dev=NULL;
char err[256];
pcap_t* descr=NULL;
char* packet;
struct pcap_pkthdr hdr;
dev = pcap_lookupdev(err);
if(dev == NULL){
printf("Unable to find the network
device");
exit(1);
}
descr = pcap_open_live(dev,1500,0,1000,err);
if(descr == NULL)
{
printf("\nUnable to open the %s for
capture",dev);
exit(1);
}
printf("\nopened the %s for capture",dev);
for(;packet=(char*)pcap_next(descr,&hdr);)
{
printf("\nPKT:%s",packet);
}
printf("\nEND");
return 0;
}
Thanks
Vidhya
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