feat: add headless_nm module

* Since RPI nor Armbian have a possibility to change (WiFi) networks after initial flash, adding a solution that it makes it possible to generate a new 'preconfigured.nmconnection' (this one is generated by rpi-imager) * As discussed here guysoft#219 Signed-off-by: Stephan Wendel <[email protected]>
KwadFan · Oct 7, 2024 · baf6d1c · baf6d1c
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diff --git a/src/modules/headless_nm/config b/src/modules/headless_nm/config
@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+#Shebang for better file detection
+#### headless_nm install module
+####
+#### Written by Stephan Wendel aka KwadFan <[email protected]>
+#### Copyright 2024 - till today
+#### https://github.com/mainsail-crew/MainsailOS
+####
+#### This File is distributed under GPLv3
+####
+
+# shellcheck disable=all
+
+# Use disable power save for wifi module
+[ -n "$HEADLESS_NM_DISABLE_PWRSAVE" ] || HEADLESS_NM_DISABLE_PWRSAVE=yes
+
+# Type of power save rclocal/service/udev
+# rclocal - backwards compatibility, runs via rc.local
+# service - will add an systemd.service to enable or disable behavior
+# on reboots
+# udev - creates a udev rules that should affect all wifi devices.
+
+[ -n "$HEADLESS_NM_PWRSAVE_TYPE" ] || HEADLESS_NM_PWRSAVE_TYPE=udev
+
+
+# DO NOT MODIFY BELOW THIS LINE UNLESS YOU KNOW CONSEQUENCES...
+
+[ -n "$HEADLESS_NM_DEPS" ] || HEADLESS_NM_DEPS="network-manager dos2unix uuid"
diff --git a/src/modules/headless_nm/filesystem/boot/WiFi-README.txt b/src/modules/headless_nm/filesystem/boot/WiFi-README.txt
@@ -0,0 +1,59 @@
+Wifi-README.txt
+
+################################################################################
+####                           IMPORTANT WARNING                            ####
+################################################################################
+####                                                                        ####
+#### First, make sure you have a decent text editor of your choice.         ####
+#### Notepad++, VSCode, SublimeText or similar are recommended.             ####
+####                                                                        ####
+#### Do not use Wordpad to edit this file, it will corrupt it and your      ####
+#### configuration will not work.                                           ####
+####                                                                        ####
+#### If you use Textedit to edit this file,                                 ####
+#### be sure to use "plain text format" and "disable smart quotes"          ####
+#### in "Textedit > Preferences", otherwise Textedit will use               ####
+#### incompatible characters and your network configuration won't work!     ####
+####                                                                        ####
+################################################################################
+
+How do I setup a new network on my OS_NAME ?
+--------------------------------------------
+
+1.) Copy and paste the 'headless_nm.txt.template'.
+    Rename this file to 'headless_nm.txt'
+
+2.) Now open the file with your favourite text editor.
+    Windows and MacOS users please read the note above!
+
+    This file is pretty self explaining, just the 'REGDOMAIN'
+    needs some explaination:
+
+    Valid country codes are:
+
+        GB (United Kingdom)
+        FR (France)
+        DE (Germany)
+        US (United States)
+        SE (Sweden)
+
+    For a complete list, please visit https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2
+
+3.) Remove the SD card afterwards.
+
+4.) Almost done... Please put the SD card back into your SBC and wait for it to connect.
+
+NOTE:
+
+Plug in a monitor and watch the console output to get its IP address or
+consult your router's setup page to get this information.
+
+You could also try to reach it by its hostname.
+
+    http://<yourpisname>.local
+
+If you did not change the hostname during the initial flash, you could use
+
+    http://OS_NAME.local
+
+5.) Enjoy OS_NAME :)
diff --git a/src/modules/headless_nm/filesystem/boot/headless_nm.txt.template b/src/modules/headless_nm/filesystem/boot/headless_nm.txt.template
@@ -0,0 +1,14 @@
+#### Headless Wifi configuration
+
+# Your Wifis SSID
+SSID="<mySSID>"
+
+# Your WiFis password
+PASSWORD="<mySecretPasword>"
+
+# Is your SSID in hidden state? [true/false]
+HIDDEN="false"
+
+# Wifi Country code
+# See Wifi-README.txt for details!
+REGDOMAIN="US"
diff --git a/src/modules/headless_nm/filesystem/etc/systemd/system/disable-wifi-pwr-mgmt.service b/src/modules/headless_nm/filesystem/etc/systemd/system/disable-wifi-pwr-mgmt.service
@@ -0,0 +1,22 @@
+#### Disable wifi power_save
+####
+#### Written by Stephan Wendel aka KwadFan <[email protected]>
+#### Copyright 2022
+#### https://github.com/mainsail-crew/MainsailOS
+####
+#### This File is distributed under GPLv3
+####
+#### Note: This is based on:
+#### https://www.intel.com/content/www/us/en/support/articles/000006168/boards-and-kits.html
+
+[Unit]
+Description=Disable power management for wlan0
+After=network.target
+
+[Service]
+Type=oneshot
+StandardOutput=tty
+ExecStart=/usr/local/bin/pwrsave off
+
+[Install]
+WantedBy=multi-user.target
diff --git a/src/modules/headless_nm/filesystem/etc/systemd/system/headless_nm.service b/src/modules/headless_nm/filesystem/etc/systemd/system/headless_nm.service
@@ -0,0 +1,20 @@
+#### headless_nm service
+####
+#### Written by Stephan Wendel aka KwadFan <[email protected]>
+#### Copyright 2024
+#### https://github.com/mainsail-crew/MainsailOS
+####
+#### This File is distributed under GPLv3
+####
+
+[Unit]
+Description=Setup Wifi on headless machines using NetworkManager
+Before=network.target NetworkManager.service
+
+[Service]
+Type=oneshot
+StandardOutput=tty
+ExecStart=/usr/local/bin/headless_nm
+
+[Install]
+WantedBy=multi-user.target
diff --git a/src/modules/headless_nm/filesystem/etc/udev/rules.d/070-wifi-powersave.rules b/src/modules/headless_nm/filesystem/etc/udev/rules.d/070-wifi-powersave.rules
@@ -0,0 +1,4 @@
+ACTION=="add", \
+SUBSYSTEM=="net", \
+KERNEL=="wlan*" \
+RUN+="/usr/sbin/iw %k set power_save off"
diff --git a/src/modules/headless_nm/filesystem/usr/local/bin/headless_nm b/src/modules/headless_nm/filesystem/usr/local/bin/headless_nm
@@ -0,0 +1,183 @@
+#!/usr/bin/env bash
+####  headless_nm
+####
+#### Written by Stephan Wendel aka KwadFan <[email protected]>
+#### Copyright 2024 - till today
+#### https://github.com/mainsail-crew/MainsailOS
+####
+#### This File is distributed under GPLv3
+####
+
+#### Description:
+#### This is a wrapper for network manager to be able to setup
+#### Wifi connections on headless SBC.
+#### Takes setup from a file in /boot (/boot/firmware) and recreates
+#### Raspberrys 'preconfigured.nmconnection'
+
+#### Copyright hint: This file contains code snippets from
+#### Raspberrys raspi-config therefore it applies also there license
+#### and copyrights!
+#### See https://github.com/RPi-Distro/raspi-config/blob/bookworm/LICENSE
+
+#### It also reuses parts of raspberry-sys-mods
+#### See https://github.com/RPi-Distro/raspberrypi-sys-mods/blob/bookworm/usr/lib/raspberrypi-sys-mods/imager_custom
+
+set -e
+
+# Global Vars
+DISTRO=""
+CMDLINE="/boot/firmware/cmdline.txt"
+ARMBIANENV="/boot/armbianEnv.txt"
+UUID=""
+PSK_HASH=""
+KEYMGMT="wpa-psk"
+CONNFILE=/etc/NetworkManager/system-connections/preconfigured.nmconnection
+SETUPFILE="$(find /boot -name "headless_nm.txt")"
+REGDOMAIN=""
+CFG80211="/etc/modprobe.d/cfg80211.conf"
+
+
+# functions
+log() {
+    local msg
+    msg="${1}"
+    logger -t headless_nm "${msg}"
+}
+
+get_distro() {
+    local armbian rpi
+    armbian="$(find /boot -name "$(basename ${ARMBIANENV})")"
+    rpi="$(find /boot -name "$(basename ${CMDLINE})")"
+    log "Determine distribution ..."
+    if [[ -n "${armbian}" ]]; then
+        DISTRO="armbian"
+    elif [[ -n "${rpi}" ]]; then
+        DISTRO="rpi"
+    else
+        DISTRO=""
+        log "Could not determine distribution ... Exiting!"
+        exit 1
+    fi
+    if [[ -n "${DISTRO}" ]]; then
+        log "Using setup profile: ${DISTRO} ..."
+    fi
+}
+
+get_config() {
+    # shellcheck disable=SC1090
+    source "${SETUPFILE}"
+}
+
+gen_uuid() {
+    log "Generating UUID for connection..."
+    UUID="$(uuid -v4)"
+    declare -r UUID
+}
+
+gen_nmconnection() {
+cat <<- EOF >"${CONNFILE}"
+[connection]
+id=preconfigured
+uuid=${UUID}
+type=wifi
+[wifi]
+mode=infrastructure
+ssid=${SSID}
+hidden=${HIDDEN,,}
+[ipv4]
+method=auto
+[ipv6]
+addr-gen-mode=default
+method=auto
+[proxy]
+EOF
+}
+
+gen_keymgmt() {
+    PSK_HASH="$(gen_psk)"
+    if [[ -n "${PASSWORD}" ]]; then
+    cat <<- EOF >>${CONNFILE}
+[wifi-security]
+key-mgmt=${KEYMGMT}
+psk=${PSK_HASH}
+EOF
+fi
+}
+
+gen_psk() {
+    wpa_passphrase "${SSID}" "${PASSWORD}" | sed -n "/^.*[ \t]psk.*/s/[ \t]psk=//p"
+}
+
+set_regdomain() {
+    log "Set registration domain to '${REGDOMAIN}' ..."
+    # Shameless borrowed from
+    # https://github.com/RPi-Distro/raspi-config/blob/d22643ade3851c42648f3676e577a622c34af49a/raspi-config#L830C3-L832C5
+    if ! ischroot; then
+        iw reg set "${REGDOMAIN}"
+    fi
+    # set permanent
+    case "${DISTRO}" in
+        "rpi")
+            # Shameless borrowed from
+            # https://github.com/RPi-Distro/raspi-config/blob/d22643ade3851c42648f3676e577a622c34af49a/raspi-config#L822C3-L825C15
+            sed -i \
+            -e "s/\s*cfg80211.ieee80211_regdom=\S*//" \
+            -e "s/\(.*\)/\1 cfg80211.ieee80211_regdom=$REGDOMAIN/" \
+            "${CMDLINE}"
+            ;;
+        "armbian")
+            if [[ -f "${CFG80211}" ]]; then
+                rm -f "${CFG80211}"
+            fi
+            echo "options cfg80211 ieee80211_regdom=${REGDOMAIN}" > "${CFG80211}"
+            ;;
+    esac
+}
+
+# MAIN
+main() {
+    # Determine base distribution
+    get_distro
+
+    # Check setup file is present
+    if [[ -f "${SETUPFILE}" ]]; then
+        log "Configuration file found in ${SETUPFILE}, continuing...\n"
+    else
+        log "Configuration file not found! Nothing to do, exiting...\n"
+        exit 0
+    fi
+
+    # Generate UUID
+    gen_uuid
+
+    # Remove preconfiguration if present
+    if [[ -f "${CONNFILE}" ]]; then
+        rm -f "${CONNFILE}"
+    fi
+
+    # Read config file
+    get_config
+
+    # Generate preconfigured.nmconnection file
+    gen_nmconnection
+
+    # Add key management and psk to preconfigured.nmconnection file
+    gen_keymgmt
+
+    # Set REGDOMAIN
+    set_regdomain
+
+    # NetworkManager only accepts 0600 permissions for configs
+    chmod 0600 "${CONNFILE}"
+
+    # Cleanup
+    PSK_HASH=""
+    PASSWORD=""
+    SSID=""
+    log "Configuration successful written ..."
+    rm -f "${SETUPFILE}"
+}
+
+if [[ "${BASH_SOURCE[0]}" = "${0}" ]]; then
+    main
+fi