add tinc-up

tinc-up

@@ -0,0 +1,57 @@
+#!/usr/bin/env bash 
+set -eu
+
+DIR=$(cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd)
+MAC_ADDRESS_FILE=${DIR}/tinc-macaddr
+
+has() {
+  command -v "$1" >/dev/null 2>&1
+}
+
+die() {
+  echo $1 &>2
+  exit 1
+}
+
+set_mac() {
+  local interface=$1
+  local mac_address=$2
+  if has ifconfig; then
+    ifconfig "$interface" down
+    if [[ "$OSTYPE" == "linux-gnu" ]]; then
+      ifconfig "$interface" hw ether "$mac_address"
+    else
+      ifconfig "$interface" ether "$mac_address"
+    fi
+  elif has ip; then
+    ip link set dev "$interface" down
+    ip link set dev "$interface" address "$mac_address"
+  else
+    die "no suitable program found to configure the network interface, need iproute2 or ifconfig"
+  fi
+}
+
+start_dhcp() {
+  local interface=$1
+  if has dhcpcd; then
+    dhcpcd "$interface"
+  elif has dhclient; then
+    dhclient "$interface"
+  elif [[ "$OSTYPE" == "darwin"* ]]; then # TODO
+    untested
+    ipconfig set "$interface" DHCP
+  else
+    die "no suitable dhcp program found, need dhcpcd or dhclient"
+  fi
+}
+
+[ -z "${INTERFACE:-}" ] && die "no INTERFACE environment variable set"
+
+if [ ! -f "$MAC_ADDRESS_FILE" ]; then
+  die "${MAC_ADDRESS_FILE} does not exists. Generate it with ./tinc-generate-mac"
+fi
+
+read -r MAC_ADDRESS <"$MAC_ADDRESS_FILE"
+set_mac "$INTERFACE" "$MAC_ADDRESS"
+
+start_dhcp "$INTERFACE"