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#!/bin/bash
#
# Oracle Linux DTrace.
# Copyright (c) 2025, Oracle and/or its affiliates. All rights reserved.
# Licensed under the Universal Permissive License v 1.0 as shown at
# http://oss.oracle.com/licenses/upl.
#
#
# get_remote.sh ipv4|ipv6|cleanup [tcpport]
#
# Create (or cleanup) a network namespace with either IPv4 or IPv6
# address associated.
#
# Print the local address and the remote address, or an
# error message if a failure occurred during setup.
#
# If tcpport is specified, start sshd on that port.
#
# Exit status is 0 if all succceeded.
#
cmd=$1
tcpport=$2
prefix=$(basename $tmpdir)
netns=${prefix}ns
veth1=${prefix}v1
veth2=${prefix}v2
mtu=1500
set -e
case $cmd in
cleanup) pids=$(ip netns pids ${netns} 2>/dev/null)
if [[ -n "$pids" ]]; then
kill -TERM $pids
fi
ip netns del ${netns} 2>/dev/null
exit 0
;;
ipv4) veth1_addr=192.168.168.1
veth2_addr=192.168.168.2
prefixlen=24
family=
;;
ipv6) veth1_addr=fd::1
veth2_addr=fd::2
prefixlen=64
family=-6
;;
*) echo "Unexpected cmd $cmd" >2
exit 1
;;
esac
ip netns add $netns
ip link add dev $veth1 mtu $mtu netns $netns type veth \
peer name $veth2 mtu $mtu
ip netns exec $netns ip $family addr add ${veth1_addr}/$prefixlen dev $veth1
ip netns exec $netns ip link set $veth1 up
ip addr add ${veth2_addr}/${prefixlen} dev $veth2
ip link set $veth2 up
if [[ -n "$tcpport" ]]; then
sshd=$(which sshd)
ip netns exec $netns $sshd -p $tcpport &
fi
echo "$veth2_addr $veth1_addr"
exit 0
|
