[Simh] networking with simh on MacOS?

[Larry Baker]

Jeremy,

I haven't tried SIMH 3.8.1nb1 on my Mac, but I suspect you have  
permission problems accessing the pcap devices.  My notes from my SIMH  
installation describe a ChmodBPF script included with the libpcap  
package that takes care of that:

> Install the ChmodBPF system startup item to change the permission on  
> the BPF (BSD packet filter) devices (/dev/bpf*) to allow users in  
> the “admin” group to read from and write to the Ethernet network:
>
> # mv ChmodBPF /Library/StartupItems/
>
> Mac OS X must be restarted for ChmodBPF to take effect.

ChmodBPF is a directory:

> $ ls -lR /Library/StartupItems/ChmodBPF
> total 16
> drwxr-xr-x  5 root  wheel  170 Jun  1  2005 CVS
> -rwxr-xr-x  1 root  wheel  900 Oct 18  2004 ChmodBPF
> -rw-r--r--  1 root  wheel  126 Oct 18  2004 StartupParameters.plist
>
> /Library/StartupItems/ChmodBPF/CVS:
> total 24
> -rw-r--r--  1 root  wheel  99 Jun  1  2005 Entries
> -rw-r--r--  1 root  wheel  17 Jun  1  2005 Repository
> -rw-r--r--  1 root  wheel  49 Jun  1  2005 Root


The actual script that modifies the permissions is:

> $ cat /Library/StartupItems/ChmodBPF/ChmodBPF
> #! /bin/sh
>
> . /etc/rc.common
>
> StartService ()
> {
> 	#
> 	# Unfortunately, Mac OS X's devfs is based on the old FreeBSD
> 	# one, not the current one, so there's no way to configure it
> 	# to create BPF devices with particular owners or groups.
> 	# This startup item will make it owned by the admin group,
> 	# with permissions rw-rw----, so that anybody in the admin
> 	# group can use programs that capture or send raw packets.
> 	#
> 	# Change this as appropriate for your site, e.g. to make
> 	# it owned by a particular user without changing the permissions,
> 	# so only that user and the super-user can capture or send raw
> 	# packets, or give it the permissions rw-r-----, so that
> 	# only the super-user can send raw packets but anybody in the
> 	# admin group can capture packets.
> 	#
> 	chgrp admin /dev/bpf*
> 	chmod g+rw /dev/bpf*
> }
>
> StopService ()
> {
> 	return 0;
> }
>
> RestartService () { StartService; }
>
> RunService "$1"


On my system, the /dev/bpf* devices look like this:

> $ ls -l /dev/bpf*
> crw-rw----  1 root  admin   23,   0 Oct 14 20:13 /dev/bpf0
> crw-rw----  1 root  admin   23,   1 Oct 14 20:13 /dev/bpf1
> crw-rw----  1 root  admin   23,   2 Oct 14 20:13 /dev/bpf2
> crw-rw----  1 root  admin   23,   3 Oct 14 20:13 /dev/bpf3


If your /dev/bpf* devices already look like this, maybe your account  
is not a member of the admin group.  The "id" command will list your  
groups:

> $ id
> uid=xxxx(baker) gid=xxx groups=xxx,98(_lpadmin),81(_appserveradm), 
> 79(_appserverusr),105(com.apple.sharepoint.group.4),80(admin)



Larry Baker
US Geological Survey
650-329-5608
baker at usgs.gov

On 28 Oct 2011, at 9:00 AM, simh-request at trailing-edge.com wrote:

> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 28 Oct 2011 10:06:12 -0500 (CDT)
> From: "Jeremy C. Reed" <reed at reedmedia.net>
> To: simh at trailing-edge.com
> Subject: [Simh] networking with simh on MacOS?
> Message-ID: <alpine.NEB.2.01.1110280933570.22614 at t1.m.reedmedia.net>
> Content-Type: TEXT/PLAIN; charset=US-ASCII
>
> I have
>
> $ uname -mprsv
> Darwin 10.6.0 Darwin Kernel Version 10.6.0: Wed Nov 10 18:11:58 PST
> 2010; root:xnu-1504.9.26~3/RELEASE_X86_64 x86_64 i386
>
> I installed simh-3.8.1nb1 as installed using pkgsrc with these  
> patches:
>
> http://cvsweb.netbsd.org/bsdweb.cgi/pkgsrc/emulators/simh/patches/?only_with_tag=MAIN
>
> It is built using libpcap and USE_NETWORK=YES OSTYPE=darwin.
>
> I am trying to use OpenBSD 4.9.
>
> I am unable to get the networking to work:
>
>  sim> at xq0 en0
>  File open error
>
> Any suggestions for the networking on Mac OS X?
>
> My simh configuration is:
>
>  load -r /Local/Users/jreed/opt/pkg//share/simh/ka655x.bin
>  set cpu 64m
>  at nvr openbsd.nvram
>  deposit rq qtime 1000000
>  set rq0 ra92
>  at rq0 openbsd.ra0.disk
>  set rq2 cdrom
>  at rq2 floppy48.fs
>  at xq0 en0
>  boot cpu
>  exit
>
> It does boot that OpenBSD image.
>
> The output including OpenBSD kernel output follows:
>
>
> VAX simulator V3.8-1
> NVR: buffering file in memory
> openbsd.simh> at xq0 en0
> File open error
>

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