RE: [ns] How to run emulation programs in NS-2?

[Alefiya Hussain <alefiyah@catarina.usc.edu>]

We will be integrating this patch into ns soon. 

Thank you Ruud. 

alefiya

On Mon, 17 Sep 2001, Schramp, R. wrote:

> The .bin file used to be a "patch" file.
> 
> Typical use is to set your working directory to the place of the original
> code e.g.
> 
> cd /home/mmrenyu/ns/ns-allinone/ns-2.1b8a
> 
> here you type something like
> 
> patch -p1 < ~mmrenyu/patch
> 
> 
> The -p1 tells patch to strip the first directory from the directory's in the
> patch file. ensuring that the paths in the patch file point to existing
> files.
> 
> Although the patch file is against the latest version of ns, I expect no big
> problems patching it automatically to a litle older version. If you get
> errors you can also patch the source files by hand as it is only about 20
> lines of code.
> 
> Best regards,
> 
> Ruud Schramp
> 
> 
> ------CUT HERE: <Patch>------
> diff -Naur ns-2.1b8a/emulate/net-ip.cc ns-2.1b8a_patched/emulate/net-ip.cc
> --- ns-2.1b8a/emulate/net-ip.cc	Mon Jun 25 20:01:08 2001
> +++ ns-2.1b8a_patched/emulate/net-ip.cc	Fri Aug 31 13:05:29 2001
> @@ -573,10 +573,22 @@
>  IPNetwork::send(u_char* buf, int len)
>  {
>  	struct ip *ip = (struct ip*) buf;
> +#ifdef __linux__ 
> +// r.schramp@kpn.com: For raw sockets on linux the send does not work,
> +// all packets show up only on the loopback device and are not routed
> +// to the correct host. Using sendto on a closed socket solves this problem
> +	ip->ip_len = (ip->ip_len);
> +	ip->ip_off = (ip->ip_off);
> +        sockaddr_in sin;
> +	memset((char *)&sin, 0, sizeof(sin));
> +	sin.sin_family = AF_INET;
> +        sin.sin_addr = ip->ip_dst;
> +	return (::sendto(ssock_, (char*)buf, len, 0,(sockaddr *)
> &sin,sizeof(sin)));
> +#else
>  	ip->ip_len = ntohs(ip->ip_len);
>  	ip->ip_off = ntohs(ip->ip_off);
> -
>  	return (::send(ssock_, (char*)buf, len, 0));
> +#endif
>  }
>  
>  int IPNetwork::command(int argc, const char*const* argv)
> @@ -714,8 +726,13 @@
>  		return (-1);
>  	}
>  
> +#ifndef __linux__
>  	// sort of curious, but do a connect() even though we have
>  	// HDRINCL on.  Otherwise, we get ENOTCONN when doing a send()
> +
> +	// r.schramp@kpn.com: the send does not work under linux, this has
> +	// been replaced by a sendto, however this requires a closed socket
> +
>  	sockaddr_in sin;
>  	in_addr ia = { INADDR_ANY };
>  	if (connectsock(fd, ia, 0, sin) < 0) {
> @@ -723,6 +740,7 @@
>  	"IPNetwork(%s): open: unable to connect : %s\n",
>  			name(), strerror(errno));
>  	}
> +#endif
>  	rsock_ = ssock_ = fd;
>  	mode_ = mode;
>  	NIDEBUG5("IPNetwork(%s): opened with mode %d, rsock_:%d,
> ssock_:%d\n",
> diff -Naur ns-2.1b8a/emulate/tcptap.cc ns-2.1b8a_patched/emulate/tcptap.cc
> --- ns-2.1b8a/emulate/tcptap.cc	Mon Jun 25 20:01:08 2001
> +++ ns-2.1b8a_patched/emulate/tcptap.cc	Fri Aug 31 13:08:19 2001
> @@ -36,6 +36,13 @@
>      "@(#) $Header: /nfs/jade/vint/CVSROOT/ns-2/emulate/tcptap.cc,v 1.1
> 2001/05/15 21:23:38 alefiyah Exp $ (ISI)";
>  #endif
>  
> +#ifdef __linux__
> +// r.schramp@kpn.com: The ip header structure under linux defaults to a
> different structure, this
> +// define makes the BSD ip header the default one. Actualy this solution
> does not win the beaty
> +// contest, anyone with knowledge of makefiles and configure may want to
> include it there
> +#define _BSD_SOURCE
> +#endif
> +
>  #include "tcptap.h"
> --------CUT HERE <patch>-------
>