Remove Prompt Question

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I'm using a sniffer that is asking me which interdface I would like to sniff. I'm using a machine with only 1 interface so I don't need to be asked. How can I circumvent this prompt? Thanks.

C++

//Retrive the available IPs of the local host
local = gethostbyname(hostname);
printf("\nAvailable Network Interfaces : \n");
if (local == NULL) 
{
printf("Error : %d.\n",WSAGetLastError());
return 1;
}
  
for (i = 0; local->h_addr_list[i] != 0; ++i) 
{
memcpy(&addr, local->h_addr_list[i], sizeof(struct in_addr));
printf("Interface Number : %d Address : %s\n",i,inet_ntoa(addr));
}
  
printf("Enter the interface number you would like to sniff : ");
scanf("%d",&in);


DWORD    dwLen = 0; //
memset(&dest, 0, sizeof(dest));
memcpy(&dest.sin_addr.s_addr,local->h_addr_list[in],sizeof(dest.sin_addr.s_addr));
dest.sin_family      = AF_INET;
dest.sin_port        = 0;
      
printf("\nBinding socket to local system and port 0 ...");
if (bind(sniffer,(struct sockaddr *)&dest,sizeof(dest)) == SOCKET_ERROR)
{
printf("bind(%s) failed.\n", inet_ntoa(addr));
return 1;
}
printf("Binding successful");

Posted 18-Aug-11 9:37am

Member 7766180

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Graham Breach · Accepted Answer · 2011-08-18T10:46:00

Solution 1

If you want to hardcode it, you can comment out the printf and scanf in the middle and add a in = 0; line, or more sensibly wrap them in an if block and check the value of i after the for loop.

Could you really not figure this out for yourself?

Posted 18-Aug-11 10:46am

Graham Breach

Comments

Member 7766180 18-Aug-11 17:18pm

Thank you, it works. Wouldn't it be nice just to help. Not help AND browbeat? If I could do it, I would. I'm new to this, and learning, in thanks to the many generous souls on this site. Once again,thank you.

Chuck O'Toole 18-Aug-11 23:14pm

Sorry, I agree with Graham. You are using or playing with a sniffer, which is pretty deep in IP and TCP protocols. A certain knowledge is assumed if you are going to make sense out of raw IP packets. Yet your question is so basic that it demonstrates a lack of the sophistication necessary to decode raw packets. If you're that new to all this, maybe a sniffer is not the place to start.

Member 7766180 19-Aug-11 1:53am

If one is to learn you have to push your limits. Otherwise you will never grow! Any help that you can offer is appreciated! Thank you!!!

TRK3 · Accepted Answer · 2011-08-18T10:47:00

Just count how many interfaces you have, and if you only have one, then use it rather than prompting for it:

C++

int count = 0;
while (local->h_addr_list[count] != 0)
    count++

if (count == 1) 
{
    in = 0;
} 
else 
}
    for (i = 0; local->h_addr_list[i] != 0; ++i) 
    {
        memcpy(&addr, local->h_addr_list[i], sizeof(struct in_addr));
        printf("Interface Number : %d Address : %s\n",i,inet_ntoa(addr));
    }
  
    printf("Enter the interface number you would like to sniff : ");
    scanf("%d",&in);
}