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#!/bin/sh
#
JAILOR=${SUDO_USER:?must run in sudo}
# running with `sudo` is required to be
# able running the actual commands as the
# original user.
export PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
netjail_opt() {
OPT=$1
shift 1
INDEX=1
while [ $# -gt 0 ]; do
if [ "$1" = "$OPT" ]; then
printf "%d" $INDEX
return
fi
INDEX=$(($INDEX + 1))
shift 1
done
printf "%d" 0
}
netjail_check() {
NODE_COUNT=$1
FD_COUNT=$(($(ls /proc/self/fd | wc -w) - 4))
# quit if `$FD_COUNT < ($LOCAL_M * $GLOBAL_N * 2)`:
# the script also requires `sudo -C ($FD_COUNT + 4)`
# so you need 'Defaults closefrom_override' in the
# sudoers file.
if [ $FD_COUNT -lt $(($NODE_COUNT * 2)) ]; then
echo "File descriptors do not match requirements!" >&2
exit 1
fi
}
netjail_print_name() {
printf "%s%02x%02x" $1 $2 ${3:-0}
}
netjail_bridge() {
BRIDGE=$1
ip link add $BRIDGE type bridge
ip link set dev $BRIDGE up
}
netjail_bridge_clear() {
BRIDGE=$1
ip link delete $BRIDGE
}
netjail_node() {
NODE=$1
ip netns add $NODE
}
netjail_node_clear() {
NODE=$1
ip netns delete $NODE
}
netjail_node_link_bridge() {
NODE=$1
BRIDGE=$2
ADDRESS=$3
MASK=$4
LINK_IF="$NODE-$BRIDGE-0"
LINK_BR="$NODE-$BRIDGE-1"
ip link add $LINK_IF type veth peer name $LINK_BR
ip link set $LINK_IF netns $NODE
ip link set $LINK_BR master $BRIDGE
ip -n $NODE addr add "$ADDRESS/$MASK" dev $LINK_IF
ip -n $NODE link set $LINK_IF up
ip -n $NODE link set up dev lo
ip link set $LINK_BR up
}
netjail_node_unlink_bridge() {
NODE=$1
BRIDGE=$2
LINK_BR="$NODE-$BRIDGE-1"
ip link delete $LINK_BR
}
netjail_node_add_nat() {
NODE=$1
ADDRESS=$2
MASK=$3
ip netns exec $NODE iptables -t nat -A POSTROUTING -s "$ADDRESS/$MASK" -j MASQUERADE
}
netjail_node_add_default() {
NODE=$1
ADDRESS=$2
ip -n $NODE route add default via $ADDRESS
}
netjail_node_exec() {
NODE=$1
FD_IN=$2
FD_OUT=$3
shift 3
unshare -fp --kill-child -- ip netns exec $NODE sudo -u $JAILOR -- $@ 1>& $FD_OUT 0<& $FD_IN
}
netjail_kill() {
PID=$1
for CHILD in $(ps -o pid,ppid -ax | awk "{ if ( \$2 == $PID ) { print \$1 } }"); do
netjail_kill $CHILD
done
kill $PID
}
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