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wg-quick: freebsd: add new implementation

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Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2018-05-21 22:04:37 +02:00
parent 52eb6a187c
commit 333363f77c
2 changed files with 434 additions and 16 deletions
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35
src/wg-quick/darwin.bash
View File

@ -113,20 +113,20 @@ del_routes() {
[[ $netif == "$REAL_INTERFACE" ]] && todelete+=( "$destination" ) [[ $netif == "$REAL_INTERFACE" ]] && todelete+=( "$destination" )
done < <(netstat -nr -f inet) done < <(netstat -nr -f inet)
for destination in "${todelete[@]}"; do for destination in "${todelete[@]}"; do
cmd route -q delete -inet "$destination" >/dev/null || true cmd route -q -n delete -inet "$destination" >/dev/null || true
done done
todelete=( ) todelete=( )
while read -r destination gateway _ netif; do while read -r destination gateway _ netif; do
[[ $netif == "$REAL_INTERFACE" || ( $netif == lo* && $gateway == "$REAL_INTERFACE" ) ]] && todelete+=( "$destination" ) [[ $netif == "$REAL_INTERFACE" || ( $netif == lo* && $gateway == "$REAL_INTERFACE" ) ]] && todelete+=( "$destination" )
done < <(netstat -nr -f inet6) done < <(netstat -nr -f inet6)
for destination in "${todelete[@]}"; do for destination in "${todelete[@]}"; do
cmd route -q delete -inet6 "$destination" >/dev/null || true cmd route -q -n delete -inet6 "$destination" >/dev/null || true
done done
for destination in "${ENDPOINTS[@]}"; do for destination in "${ENDPOINTS[@]}"; do
if [[ $destination == *:* ]]; then if [[ $destination == *:* ]]; then
cmd route -q delete -inet6 "$destination" >/dev/null || true cmd route -q -n delete -inet6 "$destination" >/dev/null || true
else else
cmd route -q delete -inet "$destination" >/dev/null || true cmd route -q -n delete -inet "$destination" >/dev/null || true
fi fi
done done
} }
@ -149,6 +149,7 @@ add_addr() {
} }
set_mtu() { set_mtu() {
# TODO: use better set_mtu algorithm from freebsd.bash
local mtu=0 current_mtu=-1 destination netif defaultif local mtu=0 current_mtu=-1 destination netif defaultif
if [[ -n $MTU ]]; then if [[ -n $MTU ]]; then
cmd ifconfig "$REAL_INTERFACE" mtu "$MTU" cmd ifconfig "$REAL_INTERFACE" mtu "$MTU"
@ -231,9 +232,9 @@ set_endpoint_direct_route() {
for endpoint in "${old_endpoints[@]}"; do for endpoint in "${old_endpoints[@]}"; do
[[ $remove_all_old -eq 0 && " ${ENDPOINTS[*]} " == *" $endpoint "* ]] && continue [[ $remove_all_old -eq 0 && " ${ENDPOINTS[*]} " == *" $endpoint "* ]] && continue
if [[ $endpoint == *:* && $AUTO_ROUTE6 -eq 1 ]]; then if [[ $endpoint == *:* && $AUTO_ROUTE6 -eq 1 ]]; then
cmd route -q delete -inet6 "$endpoint" >/dev/null 2>&1 || true cmd route -q -n delete -inet6 "$endpoint" >/dev/null 2>&1 || true
elif [[ $AUTO_ROUTE4 -eq 1 ]]; then elif [[ $AUTO_ROUTE4 -eq 1 ]]; then
cmd route -q delete -inet "$endpoint" >/dev/null 2>&1 || true cmd route -q -n delete -inet "$endpoint" >/dev/null 2>&1 || true
fi fi
done done
@ -244,18 +245,18 @@ set_endpoint_direct_route() {
fi fi
if [[ $endpoint == *:* && $AUTO_ROUTE6 -eq 1 ]]; then if [[ $endpoint == *:* && $AUTO_ROUTE6 -eq 1 ]]; then
if [[ -n $GATEWAY6 ]]; then if [[ -n $GATEWAY6 ]]; then
cmd route -q add -inet6 "$endpoint" -gateway "$GATEWAY6" >/dev/null || true cmd route -q -n add -inet6 "$endpoint" -gateway "$GATEWAY6" >/dev/null || true
else else
# Prevent routing loop # Prevent routing loop
cmd route -q add -inet6 "$endpoint" ::1 -blackhole >/dev/null || true cmd route -q -n add -inet6 "$endpoint" ::1 -blackhole >/dev/null || true
fi fi
added+=( "$endpoint" ) added+=( "$endpoint" )
elif [[ $AUTO_ROUTE4 -eq 1 ]]; then elif [[ $AUTO_ROUTE4 -eq 1 ]]; then
if [[ -n $GATEWAY4 ]]; then if [[ -n $GATEWAY4 ]]; then
cmd route -q add -inet "$endpoint" -gateway "$GATEWAY4" >/dev/null || true cmd route -q -n add -inet "$endpoint" -gateway "$GATEWAY4" >/dev/null || true
else else
# Prevent routing loop # Prevent routing loop
cmd route -q add -inet "$endpoint" 127.0.0.1 -blackhole >/dev/null || true cmd route -q -n add -inet "$endpoint" 127.0.0.1 -blackhole >/dev/null || true
fi fi
added+=( "$endpoint" ) added+=( "$endpoint" )
fi fi
@ -309,16 +310,17 @@ add_route() {
if [[ $1 == */0 && ( -z $TABLE || $TABLE == auto ) ]]; then if [[ $1 == */0 && ( -z $TABLE || $TABLE == auto ) ]]; then
if [[ $1 == *:* ]]; then if [[ $1 == *:* ]]; then
AUTO_ROUTE6=1 AUTO_ROUTE6=1
cmd route -q add -inet6 ::/1 -interface "$REAL_INTERFACE" >/dev/null cmd route -q -n add -inet6 ::/1 -interface "$REAL_INTERFACE" >/dev/null
cmd route -q add -inet6 8000::/1 -interface "$REAL_INTERFACE" >/dev/null cmd route -q -n add -inet6 8000::/1 -interface "$REAL_INTERFACE" >/dev/null
else else
AUTO_ROUTE4=1 AUTO_ROUTE4=1
cmd route -q add -inet 0.0.0.0/1 -interface "$REAL_INTERFACE" >/dev/null cmd route -q -n add -inet 0.0.0.0/1 -interface "$REAL_INTERFACE" >/dev/null
cmd route -q add -inet 128.0.0.0/1 -interface "$REAL_INTERFACE" >/dev/null cmd route -q -n add -inet 128.0.0.0/1 -interface "$REAL_INTERFACE" >/dev/null
fi fi
else else
[[ $TABLE == main || $TABLE == auto || -z $TABLE ]] || die "Darwin only supports TABLE=auto|main|off" [[ $TABLE == main || $TABLE == auto || -z $TABLE ]] || die "Darwin only supports TABLE=auto|main|off"
cmd route -q add "-$family" "$1" -interface "$REAL_INTERFACE" >/dev/null [[ $(route -n get "-$family" "$1" 2>/dev/null) =~ interface:\ $REAL_INTERFACE$'\n' ]] || cmd route -q -n add -$family "$1" -interface "$REAL_INTERFACE" >/dev/null
fi fi
} }
@ -327,6 +329,7 @@ set_config() {
} }
save_config() { save_config() {
# TODO: actually save addresses and DNS by running ifconfig and networksetup
local old_umask new_config current_config address cmd local old_umask new_config current_config address cmd
new_config=$'[Interface]\n' new_config=$'[Interface]\n'
for address in "${ADDRESSES[@]}"; do for address in "${ADDRESSES[@]}"; do
@ -411,7 +414,7 @@ cmd_up() {
done done
set_mtu set_mtu
up_if up_if
for i in $(while read -r _ i; do for i in $i; do [[ $i =~ ^[0-9a-z:.]+/[0-9]+$ ]] && echo "$i"; done; done < <(wg show "$REAL_INTERFACE" allowed-ips)); do for i in $(while read -r _ i; do for i in $i; do [[ $i =~ ^[0-9a-z:.]+/[0-9]+$ ]] && echo "$i"; done; done < <(wg show "$REAL_INTERFACE" allowed-ips) | sort -nr -k 2 -t /); do
add_route "$i" add_route "$i"
done done
[[ $AUTO_ROUTE4 -eq 1 || $AUTO_ROUTE6 -eq 1 ]] && set_endpoint_direct_route [[ $AUTO_ROUTE4 -eq 1 || $AUTO_ROUTE6 -eq 1 ]] && set_endpoint_direct_route

415
src/wg-quick/freebsd.bash Executable file
View File

@ -0,0 +1,415 @@
#!/usr/local/bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
#
# TODO: Are bash process subsitutions acceptable in FreeBSD, or do they create insecure temporary files?
set -e -o pipefail
shopt -s extglob
export LC_ALL=C
SELF="$(readlink -f "${BASH_SOURCE[0]}")"
export PATH="${SELF%/*}:$PATH"
WG_CONFIG=""
INTERFACE=""
ADDRESSES=( )
MTU=""
DNS=( )
TABLE=""
PRE_UP=( )
POST_UP=( )
PRE_DOWN=( )
POST_DOWN=( )
SAVE_CONFIG=0
CONFIG_FILE=""
PROGRAM="${0##*/}"
ARGS=( "$@" )
cmd() {
echo "[#] $*" >&2
"$@"
}
die() {
echo "$PROGRAM: $*" >&2
exit 1
}
parse_options() {
local interface_section=0 line key value stripped
CONFIG_FILE="$1"
[[ $CONFIG_FILE =~ ^[a-zA-Z0-9_=+.-]{1,15}$ ]] && CONFIG_FILE="/etc/wireguard/$CONFIG_FILE.conf"
[[ -e $CONFIG_FILE ]] || die "\`$CONFIG_FILE' does not exist"
[[ $CONFIG_FILE =~ (^|/)([a-zA-Z0-9_=+.-]{1,15})\.conf$ ]] || die "The config file must be a valid interface name, followed by .conf"
CONFIG_FILE="$(readlink -f "$CONFIG_FILE")"
((($(stat -f '0%#p' "$CONFIG_FILE") & $(stat -f '0%#p' "${CONFIG_FILE%/*}") & 0007) == 0)) || echo "Warning: \`$CONFIG_FILE' is world accessible" >&2
INTERFACE="${BASH_REMATCH[2]}"
shopt -s nocasematch
while read -r line || [[ -n $line ]]; do
stripped="${line%%\#*}"
key="${stripped%%=*}"; key="${key##*([[:space:]])}"; key="${key%%*([[:space:]])}"
value="${stripped#*=}"; value="${value##*([[:space:]])}"; value="${value%%*([[:space:]])}"
[[ $key == "["* ]] && interface_section=0
[[ $key == "[Interface]" ]] && interface_section=1
if [[ $interface_section -eq 1 ]]; then
case "$key" in
Address) ADDRESSES+=( ${value//,/ } ); continue ;;
MTU) MTU="$value"; continue ;;
DNS) DNS+=( ${value//,/ } ); continue ;;
Table) TABLE="$value"; continue ;;
PreUp) PRE_UP+=( "$value" ); continue ;;
PreDown) PRE_DOWN+=( "$value" ); continue ;;
PostUp) POST_UP+=( "$value" ); continue ;;
PostDown) POST_DOWN+=( "$value" ); continue ;;
SaveConfig) read_bool SAVE_CONFIG "$value"; continue ;;
esac
fi
WG_CONFIG+="$line"$'\n'
done < "$CONFIG_FILE"
shopt -u nocasematch
}
read_bool() {
case "$2" in
true) printf -v "$1" 1 ;;
false) printf -v "$1" 0 ;;
*) die "\`$2' is neither true nor false"
esac
}
auto_su() {
[[ $UID == 0 ]] || exec sudo -p "$PROGRAM must be run as root. Please enter the password for %u to continue: " -- "$BASH" -- "$SELF" "${ARGS[@]}"
}
add_if() {
cmd "${WG_QUICK_USERSPACE_IMPLEMENTATION:-wireguard-go}" "$INTERFACE"
}
del_routes() {
local todelete=( ) destination gateway netif
while read -r destination _ _ _ _ netif _; do
[[ $netif == "$INTERFACE" ]] && todelete+=( "$destination" )
done < <(netstat -nr -f inet)
for destination in "${todelete[@]}"; do
cmd route -q -n delete -inet "$destination" || true
done
todelete=( )
while read -r destination gateway _ netif; do
[[ $netif == "$INTERFACE" || ( $netif == lo* && $gateway == "$INTERFACE" ) ]] && todelete+=( "$destination" )
done < <(netstat -nr -f inet6)
for destination in "${todelete[@]}"; do
cmd route -q -n delete -inet6 "$destination" || true
done
for destination in "${ENDPOINTS[@]}"; do
if [[ $destination == *:* ]]; then
cmd route -q -n delete -inet6 "$destination" || true
else
cmd route -q -n delete -inet "$destination" || true
fi
done
}
del_if() {
[[ $HAVE_SET_DNS -eq 0 ]] || unset_dns
cmd rm -f "/var/run/wireguard/$INTERFACE.sock"
}
up_if() {
cmd ifconfig "$INTERFACE" up
}
add_addr() {
local family=inet
[[ $1 == *:* ]] && family=inet6
cmd ifconfig "$INTERFACE" "$family" "$1" alias
}
set_mtu() {
local mtu=0 endpoint output family
if [[ -n $MTU ]]; then
cmd ifconfig "$INTERFACE" mtu "$MTU"
return
fi
while read -r _ endpoint; do
[[ $endpoint =~ ^\[?([a-z0-9:.]+)\]?:[0-9]+$ ]] || continue
family=inet
[[ ${BASH_REMATCH[1]} == *:* ]] && family=inet6
output="$(route -n get "-$family" "${BASH_REMATCH[1]}" || true)"
[[ $output =~ interface:\ ([^ ]+)$'\n' && $(ifconfig "${BASH_REMATCH[1]}") =~ mtu\ ([0-9]+) && ${BASH_REMATCH[1]} -gt $mtu ]] && mtu="${BASH_REMATCH[1]}"
done < <(wg show "$INTERFACE" endpoints)
if [[ $mtu -eq 0 ]]; then
read -r output < <(route -n get default || true) || true
[[ $output =~ interface:\ ([^ ]+)$'\n' && $(ifconfig "${BASH_REMATCH[1]}") =~ mtu\ ([0-9]+) && ${BASH_REMATCH[1]} -gt $mtu ]] && mtu="${BASH_REMATCH[1]}"
fi
[[ $mtu -gt 0 ]] || mtu=1500
cmd ifconfig "$INTERFACE" mtu $(( mtu - 80 ))
}
collect_gateways() {
local destination gateway
GATEWAY4=""
while read -r destination gateway _; do
[[ $destination == default ]] || continue
GATEWAY4="$gateway"
break
done < <(netstat -nr -f inet)
GATEWAY6=""
while read -r destination gateway _; do
[[ $destination == default ]] || continue
[[ $gateway == fe80:* ]] && continue
GATEWAY6="$gateway"
break
done < <(netstat -nr -f inet6)
}
collect_endpoints() {
ENDPOINTS=( )
while read -r _ endpoint; do
[[ $endpoint =~ ^\[?([a-z0-9:.]+)\]?:[0-9]+$ ]] || continue
ENDPOINTS+=( "${BASH_REMATCH[1]}" )
done < <(wg show "$INTERFACE" endpoints)
}
set_endpoint_direct_route() {
local old_endpoints endpoint old_gateway4 old_gateway6 remove_all_old=0 added=( )
old_endpoints=( "${ENDPOINTS[@]}" )
old_gateway4="$GATEWAY4"
old_gateway6="$GATEWAY6"
collect_gateways
collect_endpoints
[[ $old_gateway4 != "$GATEWAY4" || $old_gateway6 != "$GATEWAY6" ]] && remove_all_old=1
if [[ $remove_all_old -eq 1 ]]; then
for endpoint in "${ENDPOINTS[@]}"; do
[[ " ${old_endpoints[*]} " == *" $endpoint "* ]] || old_endpoints+=( "$endpoint" )
done
fi
for endpoint in "${old_endpoints[@]}"; do
[[ $remove_all_old -eq 0 && " ${ENDPOINTS[*]} " == *" $endpoint "* ]] && continue
if [[ $endpoint == *:* && $AUTO_ROUTE6 -eq 1 ]]; then
cmd route -q -n delete -inet6 "$endpoint" 2>/dev/null || true
elif [[ $AUTO_ROUTE4 -eq 1 ]]; then
cmd route -q -n delete -inet "$endpoint" 2>/dev/null || true
fi
done
for endpoint in "${ENDPOINTS[@]}"; do
if [[ $remove_all_old -eq 0 && " ${old_endpoints[*]} " == *" $endpoint "* ]]; then
added+=( "$endpoint" )
continue
fi
if [[ $endpoint == *:* && $AUTO_ROUTE6 -eq 1 ]]; then
if [[ -n $GATEWAY6 ]]; then
cmd route -q -n add -inet6 "$endpoint" -gateway "$GATEWAY6" || true
else
# Prevent routing loop
cmd route -q -n add -inet6 "$endpoint" ::1 -blackhole || true
fi
added+=( "$endpoint" )
elif [[ $AUTO_ROUTE4 -eq 1 ]]; then
if [[ -n $GATEWAY4 ]]; then
cmd route -q -n add -inet "$endpoint" -gateway "$GATEWAY4" || true
else
# Prevent routing loop
cmd route -q -n add -inet "$endpoint" 127.0.0.1 -blackhole || true
fi
added+=( "$endpoint" )
fi
done
ENDPOINTS=( "${added[@]}" )
}
monitor_daemon() {
echo "[+] Backgrounding route monitor" >&2
(trap 'del_routes; exit 0' INT TERM EXIT
exec >/dev/null 2>&1
local event
# TODO: this should also check to see if the endpoint actually changes
# in response to incoming packets, and then call set_endpoint_direct_route
# then too. That function should be able to gracefully cleanup if the
# endpoints change.
while read -r event; do
[[ $event == RTM_* ]] || continue
ifconfig "$INTERFACE" >/dev/null 2>&1 || break
[[ $AUTO_ROUTE4 -eq 1 || $AUTO_ROUTE6 -eq 1 ]] && set_endpoint_direct_route
# TODO: set the mtu as well, but only if up
done < <(route -n monitor)) & disown
}
HAVE_SET_DNS=0
set_dns() {
[[ ${#DNS[@]} -gt 0 ]] || return 0
printf 'nameserver %s\n' "${DNS[@]}" | cmd resolvconf -a "$INTERFACE" -x
HAVE_SET_DNS=1
}
unset_dns() {
[[ ${#DNS[@]} -gt 0 ]] || return 0
cmd resolvconf -d "$INTERFACE"
}
add_route() {
[[ $TABLE != off ]] || return 0
local family=inet
[[ $1 == *:* ]] && family=inet6
if [[ -n $TABLE && $TABLE != auto ]]; then
cmd route -q -n add "-$family" -fib "$TABLE" "$1" -interface "$INTERFACE"
elif [[ $1 == */0 ]]; then
if [[ $1 == *:* ]]; then
AUTO_ROUTE6=1
cmd route -q -n add -inet6 ::/1 -interface "$INTERFACE"
cmd route -q -n add -inet6 8000::/1 -interface "$INTERFACE"
else
AUTO_ROUTE4=1
cmd route -q -n add -inet 0.0.0.0/1 -interface "$INTERFACE"
cmd route -q -n add -inet 128.0.0.0/1 -interface "$INTERFACE"
fi
else
[[ $(route -n get "-$family" "$1" 2>/dev/null) =~ interface:\ $INTERFACE$'\n' ]] || cmd route -q -n add "-$family" "$1" -interface "$INTERFACE"
fi
}
set_config() {
cmd wg setconf "$INTERFACE" <(echo "$WG_CONFIG")
}
save_config() {
# TODO: actually save addresses by running ifconfig
local old_umask new_config current_config address cmd
new_config=$'[Interface]\n'
for address in "${ADDRESSES[@]}"; do
new_config+="Address = $address"$'\n'
done
while read -r address; do
[[ $address =~ ^nameserver\ ([a-zA-Z0-9_=+:%.-]+)$ ]] && new_config+="DNS = ${BASH_REMATCH[1]}"$'\n'
done < <(resolvconf -l "$INTERFACE" 2>/dev/null)
[[ -n $MTU ]] && new_config+="MTU = $MTU"$'\n'
[[ -n $TABLE ]] && new_config+="Table = $TABLE"$'\n'
[[ $SAVE_CONFIG -eq 0 ]] || new_config+=$'SaveConfig = true\n'
for cmd in "${PRE_UP[@]}"; do
new_config+="PreUp = $cmd"$'\n'
done
for cmd in "${POST_UP[@]}"; do
new_config+="PostUp = $cmd"$'\n'
done
for cmd in "${PRE_DOWN[@]}"; do
new_config+="PreDown = $cmd"$'\n'
done
for cmd in "${POST_DOWN[@]}"; do
new_config+="PostDown = $cmd"$'\n'
done
old_umask="$(umask)"
umask 077
current_config="$(cmd wg showconf "$INTERFACE")"
trap 'rm -f "$CONFIG_FILE.tmp"; exit' INT TERM EXIT
echo "${current_config/\[Interface\]$'\n'/$new_config}" > "$CONFIG_FILE.tmp" || die "Could not write configuration file"
sync "$CONFIG_FILE.tmp"
mv "$CONFIG_FILE.tmp" "$CONFIG_FILE" || die "Could not move configuration file"
trap - INT TERM EXIT
umask "$old_umask"
}
execute_hooks() {
local hook
for hook in "$@"; do
hook="${hook//%i/$INTERFACE}"
echo "[#] $hook" >&2
(eval "$hook")
done
}
cmd_usage() {
cat >&2 <<-_EOF
Usage: $PROGRAM [ up | down | save ] [ CONFIG_FILE | INTERFACE ]
CONFIG_FILE is a configuration file, whose filename is the interface name
followed by \`.conf'. Otherwise, INTERFACE is an interface name, with
configuration found at /etc/wireguard/INTERFACE.conf. It is to be readable
by wg(8)'s \`setconf' sub-command, with the exception of the following additions
to the [Interface] section, which are handled by $PROGRAM:
- Address: may be specified one or more times and contains one or more
IP addresses (with an optional CIDR mask) to be set for the interface.
- DNS: an optional DNS server to use while the device is up.
- MTU: an optional MTU for the interface; if unspecified, auto-calculated.
- Table: an optional routing table to which routes will be added; if
unspecified or \`auto', the default table is used. If \`off', no routes
are added.
- PreUp, PostUp, PreDown, PostDown: script snippets which will be executed
by bash(1) at the corresponding phases of the link, most commonly used
to configure DNS. The string \`%i' is expanded to INTERFACE.
- SaveConfig: if set to \`true', the configuration is saved from the current
state of the interface upon shutdown.
See wg-quick(8) for more info and examples.
_EOF
}
cmd_up() {
local i
[[ -z $(ifconfig "$INTERFACE" 2>/dev/null) ]] || die "\`$INTERFACE' already exists"
trap 'del_if; del_routes; exit' INT TERM EXIT
execute_hooks "${PRE_UP[@]}"
add_if
set_config
for i in "${ADDRESSES[@]}"; do
add_addr "$i"
done
set_mtu
up_if
set_dns
for i in $(while read -r _ i; do for i in $i; do [[ $i =~ ^[0-9a-z:.]+/[0-9]+$ ]] && echo "$i"; done; done < <(wg show "$INTERFACE" allowed-ips) | sort -nr -k 2 -t /); do
add_route "$i"
done
[[ $AUTO_ROUTE4 -eq 1 || $AUTO_ROUTE6 -eq 1 ]] && set_endpoint_direct_route
monitor_daemon
execute_hooks "${POST_UP[@]}"
trap - INT TERM EXIT
}
cmd_down() {
[[ " $(wg show interfaces) " == *" $INTERFACE "* ]] || die "\`$INTERFACE' is not a WireGuard interface"
execute_hooks "${PRE_DOWN[@]}"
[[ $SAVE_CONFIG -eq 0 ]] || save_config
del_if
unset_dns
execute_hooks "${POST_DOWN[@]}"
}
cmd_save() {
[[ " $(wg show interfaces) " == *" $INTERFACE "* ]] || die "\`$INTERFACE' is not a WireGuard interface"
save_config
}
# ~~ function override insertion point ~~
if [[ $# -eq 1 && ( $1 == --help || $1 == -h || $1 == help ) ]]; then
cmd_usage
elif [[ $# -eq 2 && $1 == up ]]; then
auto_su
parse_options "$2"
cmd_up
elif [[ $# -eq 2 && $1 == down ]]; then
auto_su
parse_options "$2"
cmd_down
elif [[ $# -eq 2 && $1 == save ]]; then
auto_su
parse_options "$2"
cmd_save
else
cmd_usage
exit 1
fi
exit 0