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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() {
local 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() {
local NODE_COUNT=$1
local FD_COUNT=$(($(ls /proc/self/fd | wc -w) - 4))
# quit if `$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_check_bin() {
local PROGRAM=$1
local MATCH=$(ls $(echo $PATH | tr ":" "\n") | grep "^$PROGRAM\$" | tr "\n" " " | awk '{ print $1 }')
# quit if the required binary $PROGRAM can not be
# found in the used $PATH.
if [ "$MATCH" != "$PROGRAM" ]; then
echo "Required binary not found: $PROGRAM" >&2
exit 1
fi
}
netjail_print_name() {
printf "%s%02x%02x" $1 $2 ${3:-0}
}
netjail_bridge() {
local BRIDGE=$1
ip link add $BRIDGE type bridge
ip link set dev $BRIDGE up
}
netjail_bridge_clear() {
local BRIDGE=$1
ip link delete $BRIDGE
}
netjail_node() {
local NODE=$1
ip netns add $NODE
}
netjail_node_clear() {
local NODE=$1
ip netns delete $NODE
}
netjail_node_link_bridge() {
local NODE=$1
local BRIDGE=$2
local ADDRESS=$3
local MASK=$4
local LINK_IF="$NODE-$BRIDGE-0"
local LINK_BR="$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() {
local NODE=$1
local BRIDGE=$2
local LINK_BR="$NODE-$BRIDGE-1"
ip link delete $LINK_BR
}
netjail_node_add_nat() {
local NODE=$1
local ADDRESS=$2
local MASK=$3
ip netns exec $NODE iptables -t nat -A POSTROUTING -s "$ADDRESS/$MASK" -j MASQUERADE
}
netjail_node_add_default() {
local NODE=$1
local ADDRESS=$2
ip -n $NODE route add default via $ADDRESS
}
netjail_node_exec() {
local NODE=$1
local FD_IN=$2
local FD_OUT=$3
shift 3
unshare -fp --kill-child -- ip netns exec $NODE sudo -u $JAILOR -- $@ 1>& $FD_OUT 0<& $FD_IN
}
netjail_kill() {
local PID=$1
local MATCH=$(ps --pid $PID | awk "{ if ( \$1 == $PID ) { print \$1 } }" | wc -l)
if [ $MATCH -gt 0 ]; then
kill -n 19 $PID
for CHILD in $(ps -o pid,ppid -ax | awk "{ if ( \$2 == $PID ) { print \$1 } }"); do
netjail_kill $CHILD
done
kill $PID
fi
}
netjail_killall() {
if [ $# -gt 0 ]; then
local PIDS=$1
for PID in $PIDS; do
netjail_kill $PID
done
fi
}
netjail_waitall() {
if [ $# -gt 0 ]; then
local PIDS=$1
for PID in $PIDS; do
wait $PID
done
fi
}
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