Fixed in r2660 on SVN.
Issue #901:
http://wald.intevation.org/tracker/index.php?func=detail&aid=901&group_id=29&atid=220
Thanks for helping!
s a wrote:
> If I am not mistaken nessus used to package pcap with it, and the pcap
> was setup to always be non-blocking. Now openvaslibraries uses the pcap
> that is already installed on the system and is blocking by default. So
> if you call a function that uses pcap such as Tcp_Ping() on an IP adress
> that is behind a firewall or down then pcap will block forever waiting
> on the first port until the plugin just times out. I believe that the
> uses of pcap in openvas were intended to be non-blocking. For example
> Looking at bpf_share.c, go to the function bpf_next_tv. Here you see:
>
> do {
> p = (u_char*)pcap_next(pcaps[bpf], &head);
> *caplen = head.caplen;
> if ( p != NULL ) break;
> gettimeofday(&now, NULL);
> } while ( !((now.tv_sec > timeout.tv_sec) ||
> (now.tv_sec == timeout.tv_sec && now.tv_usec >=
> timeout.tv_usec ) ));
>
> The function has built in timeout checks so that if the port has not
> responded in the given time it times out, so that tcp_ping for example
> can then try the next port in the list. With pcap being blocking that
> call to pcap_next blocks forever. The fix is simple and just requires
> calling pcap_setnonblock on the pcap device. So, the question is does
> openvas require pcap to be blocking or non blocking? Settting it as
> non-blocking doesnt appear to break anything. Thoughts?
>
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