add wrapper script

CMakeLists.txt

@@ -1,12 +1,15 @@
-cmake_minimum_required(VERSION 3.19)
+cmake_minimum_required(VERSION 3.10)
 project(captive-netns-helper C)
 
 set(CMAKE_C_STANDARD 99)
 
 if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
-    set(CMAKE_INSTALL_PREFIX /usr/local/bin)
+    set(CMAKE_INSTALL_PREFIX /usr/local)
 endif(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
 
 add_executable(captive-netns-helper main.c)
 install(TARGETS captive-netns-helper
-        RUNTIME DESTINATION bin)
+        RUNTIME DESTINATION bin)
+install(FILES captive-portal.sh
+        PERMISSIONS OWNER_EXECUTE OWNER_WRITE OWNER_READ GROUP_READ GROUP_EXECUTE WORLD_READ WORLD_EXECUTE
+        DESTINATION bin)

captive-portal.sh

@@ -0,0 +1,36 @@
+#!/bin/bash
+
+if [ $EUID -eq 0 ]; then
+    echo "error: this script should not be launched as root"
+    exit 1
+fi
+
+if [ $# -eq 0 ]; then
+    echo "error: no command specified"
+    exit 1
+fi
+
+export $(dhcpcd -U $IFACE)
+if [ -z "$domain_name_servers" ]; then
+    echo "error: \$domain_name_servers variable not found"
+    exit 1
+fi
+
+IFACE=wlp3s0
+ENV=
+for var in DISPLAY HOME PWD EDITOR USER XAUTHORITY LANG DBUS_SESSION_BUS_ADDRESS; do
+    value="${!var}"
+    if [ ! -z "$value" ]; then
+        ENV="$ENV --env $var=$value"
+    fi
+done
+
+_doas="doas"
+if ! command -v doas &>/dev/null; then
+    _doas="sudo"
+fi
+
+$_doas captive-netns-helper \
+    --nameserver $domain_name_servers \
+    --ns-file /run/netns/captive \
+    --uid $(id -u) --gid $(id -g) $ENV "$@"