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wg-quick: openbsd: no use for userspace support 

With alignment between the kernel and userspace, along with userspace
packages, we can now rely on the kernel in the future always having
wg(4).

This also simplifies the interface selection logic, and stores the
wg-quick interface name as the description.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2020-10-18 22:27:22 +02:00
parent 265e81a344
commit c3f26340e6
1 changed files with 23 additions and 41 deletions
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64
src/wg-quick/openbsd.bash
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@ -88,42 +88,33 @@ auto_su() {
get_real_interface() {
local interface diff
wg show interfaces >/dev/null
[[ -f "/var/run/wireguard/$INTERFACE.name" ]] || return 1
interface="$(< "/var/run/wireguard/$INTERFACE.name")"
if [[ $interface != wg* ]]; then
[[ -n $interface && -S "/var/run/wireguard/$interface.sock" ]] || return 1
diff=$(( $(stat -f %m "/var/run/wireguard/$interface.sock" 2>/dev/null || echo 200) - $(stat -f %m "/var/run/wireguard/$INTERFACE.name" 2>/dev/null || echo 100) ))
[[ $diff -ge 2 || $diff -le -2 ]] && return 1
echo "[+] Tun interface for $INTERFACE is $interface" >&2
else
[[ " $(wg show interfaces) " == *" $interface "* ]] || return 1
fi
REAL_INTERFACE="$interface"
return 0
local interface line
while IFS= read -r line; do
if [[ $line =~ ^([a-z]+[0-9]+):\ .+ ]]; then
interface="${BASH_REMATCH[1]}"
continue
fi
if [[ $interface == wg* && $line =~ ^\ description:\ wg-quick:\ (.+) && ${BASH_REMATCH[1]} == "$INTERFACE" ]]; then
REAL_INTERFACE="$interface"
return 0
fi
done < <(ifconfig)
return 1
}
add_if() {
local index=0 ret
while true; do
if ret="$(cmd ifconfig wg$index create 2>&1)"; then
mkdir -p "/var/run/wireguard/"
echo wg$index > /var/run/wireguard/$INTERFACE.name
get_real_interface
local -A existing_ifs="( $(wg show interfaces | sed 's/\([^ ]*\)/[\1]=1/g') )"
local index ret
for ((index=0; index <= 2147483647; ++index)); do [[ -v existing_ifs[wg$index] ]] || break; done
if ret="$(cmd ifconfig wg$index create description "wg-quick: $INTERFACE" 2>&1)"; then
REAL_INTERFACE="wg$index"
return 0
fi
if [[ $ret != *"ifconfig: SIOCIFCREATE: File exists"* ]]; then
echo "[!] Missing WireGuard kernel support ($ret). Falling back to slow userspace implementation." >&3
break
fi
echo "[+] wg$index in use, trying next"
((++index))
[[ $ret == *"ifconfig: SIOCIFCREATE: File exists"* ]] && continue
echo "$ret" >&3
return 1
done
export WG_TUN_NAME_FILE="/var/run/wireguard/$INTERFACE.name"
mkdir -p "/var/run/wireguard/"
cmd "${WG_QUICK_USERSPACE_IMPLEMENTATION:-wireguard-go}" tun
get_real_interface
}
del_routes() {
@ -153,12 +144,7 @@ del_routes() {
del_if() {
unset_dns
if [[ -n $REAL_INTERFACE && $REAL_INTERFACE != wg* ]]; then
cmd rm -f "/var/run/wireguard/$REAL_INTERFACE.sock"
else
cmd ifconfig $REAL_INTERFACE destroy
fi
cmd rm -f "/var/run/wireguard/$INTERFACE.name"
[[ -n $REAL_INTERFACE ]] && cmd ifconfig $REAL_INTERFACE destroy
}
up_if() {
@ -438,9 +424,7 @@ cmd_up() {
}
cmd_down() {
if ! get_real_interface || [[ " $(wg show interfaces) " != *" $REAL_INTERFACE "* ]]; then
die "\`$INTERFACE' is not a WireGuard interface"
fi
get_real_interface || die "\`$INTERFACE' is not a WireGuard interface"
execute_hooks "${PRE_DOWN[@]}"
[[ $SAVE_CONFIG -eq 0 ]] || save_config
del_if
@ -449,9 +433,7 @@ cmd_down() {
}
cmd_save() {
if ! get_real_interface || [[ " $(wg show interfaces) " != *" $REAL_INTERFACE "* ]]; then
die "\`$INTERFACE' is not a WireGuard interface"
fi
get_real_interface || die "\`$INTERFACE' is not a WireGuard interface"
save_config
}