From 05f5ee9aa2a7e237d28155f0330380ce610b0ccf Mon Sep 17 00:00:00 2001
From: Ian Kelling <iank@fsf.org>
Date: Thu, 13 Jan 2022 14:31:01 -0500
Subject: [PATCH] add ifname option

---
 vpn-server-setup | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/vpn-server-setup b/vpn-server-setup
index 69ce541..a4b203b 100755
--- a/vpn-server-setup
+++ b/vpn-server-setup
@@ -27,6 +27,7 @@ usage: ${0##*/} [OPTIONS] [IPV6_ADDR/BITS]
 -6  IP6_NETWORK  Do ip6 nat for this network. ipv6 will work without nat,
      but you may want it in certain circumstances.
 -d   Do not push dns
+-i INTERFACE_NAME name of tun interface
 -n  NAME  default = server. 2 servers on the same host need different names.
 -p  PORT  default 1194
 -r   Do not push default route
@@ -58,13 +59,14 @@ route=true
 start=true
 ip4=10.8.0
 name=server
-temp=$(getopt -l help 4:6:dn:p:rsh "$@") || usage 1
+temp=$(getopt -l help 4:6:di:n:p:rsh "$@") || usage 1
 eval set -- "$temp"
 while true; do
   case $1 in
     -4) ip4=$2; shift 2 ;;
     -6) ip6net=$2; shift 2 ;;
     -d) dns=false; shift ;;
+    -i) ifname=$2; shift 2 ;;
     -n) name=$2; shift 2 ;;
     -p) port=$2; shift 2 ;;
     -r) route=false; shift ;;
@@ -160,8 +162,12 @@ if ! $keys_exist; then
   fi
 fi
 
-
-gzip -dc /usr/share/doc/openvpn/examples/sample-config-files/server.conf.gz >$conf
+if [[ -e /usr/share/doc/openvpn/examples/sample-config-files/server.conf ]]; then
+  cat /usr/share/doc/openvpn/examples/sample-config-files/server.conf >$conf
+else
+  # pre-bullsye name
+  gzip -dc /usr/share/doc/openvpn/examples/sample-config-files/server.conf.gz >$conf
+fi
 
 cafile=$server_dir/ca-$name.crt
 cp $ca_origin $cafile
@@ -222,6 +228,12 @@ push "dhcp-option DNS $ip4.1"
 EOF
 fi
 
+if [[ $ifname ]]; then
+  cat >>$conf <<EOF
+dev $ifname
+EOF
+fi
+
 if [[ $ip6 ]]; then
   cat >>$conf <<EOF
 push tun-ipv6 # legacy option that flidas needs, has no harm.
-- 
2.30.2