On 2020-06-24 19:22, Joel Sherrill wrote:
Hi
Does someone have a qemu command line handy for running libbsd network applications on Qemu?
I have lots of notes and old examples but can't seem to trip the right combination today.
Thanks.
--joel
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To boot epics I was setting up DHCP, ntp and nfs on my development host,
run this script:
[h1@earth utilities (master *+)]$ more setUpNetworkForQemu.py
## @brief This Python file uses the following encoding: utf-8
# Documentation for this module.
#
# More details.
## Documentation for a function.
#
import netifaces
import subprocess
import dns.resolver
import subprocess
from string import Template
brNet = '10.1.0.0'
brNetMask = '255.255.255.0'
brLeaseRange = '10.1.0.100 10.1.0.120'
br0Ip = '10.1.0.1'
ethNet = '10.0.0.0'
ethNetMask = '255.255.255.0'
ethLeaseRange = '10.0.0.100 10.0.0.120'
eth0Ip = '10.0.0.1'
def setupAndStartDhcpd():
dhcpdConfStr = ('\n' +
'default-lease-time 600;\n' +
'max-lease-time 7200;\n' +
'option ntp-servers $ntpIp;\n' +
'option rtems-cmdline code 129=string;\n' +
'option rtems-cmdline "Ich DIch doch auch";\n' +
'filename "RtemsForever";\n' +
'option domain-name "rtems";\n' +
'\n' +
'subnet ' + brNet + ' netmask ' + brNetMask + ' {\n' +
'range ' + brLeaseRange + ';\n' +
'option routers ' + br0Ip + ';\n' +
'option domain-name-servers $dnsIp;\n' +
'}\n' +
'subnet ' + ethNet + ' netmask ' + ethNetMask + ' {\n' +
'range ' + ethLeaseRange + ';\n' +
'option routers ' + eth0Ip + ';\n' +
'option domain-name-servers $dnsIp;\n' +
'}\n' )
# stop dhcp-server
subprocess.run(['/bin/systemctl', 'stop', 'isc-dhcp-server.service'])
dnsResolver = dns.resolver.Resolver()
print("will setup dhcpd with dhcp-server at : ",
dnsResolver.nameservers[0])
s = Template(dhcpdConfStr)
txtToFile = s.substitute(dnsIp = dnsResolver.nameservers[0], ntpIp =
'10.1.0.1')
with open('/etc/dhcp/dhcpd.conf', 'w') as f:
print(txtToFile, file=f)
f.close()
s = 'INTERFACESv4="br0"'
with open('/etc/default/isc-dhcp-server', 'w') as f:
print(s, file=f)
f.close()
# start dhcp-server
subprocess.run(['/bin/systemctl', 'start', 'isc-dhcp-server.service'])
def main():
print("\nWill setup qemu network\n")
#setup a bridge
subprocess.run(['/sbin/brctl', 'addbr', 'br0'])
subprocess.run(['/sbin/ifconfig', 'br0', br0Ip, 'netmask', brNetMask,
'up'])
subprocess.run(['/usr/bin/tunctl', '-t', 'tap0'])
subprocess.run(['/usr/bin/tunctl', '-t', 'tap1'])
subprocess.run(['/sbin/brctl', 'addif', 'br0', 'tap0', 'tap1'])
subprocess.run(['/sbin/ifconfig', 'tap0'])
subprocess.run(['/sbin/ifconfig', 'tap1'])
# check for default gateway and interface used
gws = netifaces.gateways()
defaultGw = gws['default'][netifaces.AF_INET]
gwAddress = defaultGw[0]
gwInterface = defaultGw[1]
print ("Default gateway : ", gwAddress, " on interface : ",
gwInterface)
if 'wlan' in gwInterface :
print("Wlan interface used!? (", gwInterface, ")\n")
print("dummy eth mit ip_forwarding must be put in place")
#bridging wlan0 to eth0
s = '1'
with open('/proc/sys/net/ipv4/ip_forward', 'w') as f:
print(s, file=f)
f.close()
subprocess.run(['/sbin/iptables', '-t', 'nat', '-A', 'POSTROUTING',
'-o', 'wlan0', '-j', 'MASQUERADE'])
subprocess.run(['/sbin/brctl', 'addif', 'br0', 'eth0'])
subprocess.run(['ifconfig', 'eth0', eth0Ip, 'netmask', ethNetMask,
'up'])
setupAndStartDhcpd()
subprocess.run(['/sbin/ifconfig', 'tap0', 'up'])
print("ready for qemu")
main()
and then start a exe file with
[h1@earth QtC-epics-base (7.0 *)]$ more startQemu
#!/bin/bash
echo Script name: $0
if [ $# -ne 1 ];
then echo "Please name the exe file"
exit 2
fi
#-net nic -net tap,ifname=tap1,script=no \
#-net nic,model=cadence_gem -net tap,ifname=tap1,script=no \
# -s -no-reboot
sudo qemu-system-aarch64 -s -no-reboot \
-net nic,model=cadence_gem -net tap,ifname=tap0,script=no \
-serial null -serial mon:stdio -nographic -M xilinx-zynq-a9 -m 256M \
-kernel bin/RTEMS-xilinx_zynq_a9_qemu/$1
HTH, Heinz
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