312 lines
6.8 KiB
Bash
Executable File
312 lines
6.8 KiB
Bash
Executable File
#!/bin/sh
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#
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# Manage IP address configuration.
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#
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# The IP address configuration exists in 3 places:
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#
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# - The persistent configuration is stored in network.conf on
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# the configuration partition of the SD card.
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# This configuration is activated on boot.
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#
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# The syntax of this file is as follows:
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#
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# MODE=dhcp / MODE=static
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# IPADDR=172.16.3.4
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# NETMASK=255.255.0.0
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# GATEWAY=172.16.0.1
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#
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# - The active configuration, which determines the actual IP address,
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# is stored in /var/lib/puzzlefw/cfg/network_active.conf in
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# the RAM filesystem. It has the same format as described above.
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#
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# The same information is also present in /etc/network/interfaces.
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#
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. /opt/puzzlefw/lib/functions.sh
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# Load the persistent or active configuration.
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# $1 = file name to read
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load_network_config() {
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if [ ! -f ${CONFIG_DIR}/${1} ]; then
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echo "ERROR: File not found ${CONFIG_DIR}/${1}" >&2
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exit 1
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fi
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. ${CONFIG_DIR}/${1}
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}
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# Write configuration to file.
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# $1 = file name to write
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write_network_config() {
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mkdir -p ${CONFIG_DIR}
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cat >${CONFIG_DIR}/${1} <<EOF
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MODE=${MODE}
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IPADDR=${IPADDR}
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NETMASK=${NETMASK}
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GATEWAY=${GATEWAY}
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EOF
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}
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# Write /etc/network/interfaces
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write_network_interfaces() {
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IF_METHOD="dhcp"
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IF_ADDRESS=""
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IF_NETMASK=""
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IF_GATEWAY=""
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if [ "$MODE" = "static" ]; then
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IF_METHOD="static"
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IF_ADDRESS=" address ${IPADDR}"
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IF_NETMASK=" netmask ${NETMASK}"
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if [ -n "$GATEWAY" ]; then
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IF_GATEWAY=" gateway ${GATEWAY}"
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fi
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fi
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echo "Writing /etc/network/interfaces ..."
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cat >/etc/network/interfaces.new <<EOF
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auto lo
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iface lo inet loopback
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auto eth0
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iface eth0 inet $IF_METHOD
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$IF_ADDRESS
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$IF_NETMASK
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$IF_GATEWAY
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EOF
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mv /etc/network/interfaces.new /etc/network/interfaces
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}
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# Initialize configuration from SD card.
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ipcfg_init() {
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echo "Activating saved IP address configuration ..."
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# Lock to avoid conflicting changes.
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lock_config || exit 1
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# Persistent configuration file has already been copied from SD card.
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# Copy persistent configuration to active configuration.
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cp -a ${CONFIG_DIR}/network.conf ${CONFIG_DIR}/network_active.conf
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# Load persistent configuration.
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load_network_config network.conf
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# Write /etc/network/interfaces
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write_network_interfaces
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}
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# Show loaded network configuration.
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show_network_config() {
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echo " Mode: $MODE"
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if [ "$MODE" = "static" ]; then
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echo " IP address: $IPADDR"
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echo " Netmask: $NETMASK"
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echo " Gateway: $GATEWAY"
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fi
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}
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# Display configuration.
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ipcfg_show() {
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load_network_config network_active.conf
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echo "Active IP address configuration:"
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show_network_config
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load_network_config network.conf
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echo "Saved IP address configuration:"
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show_network_config
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}
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# Check that parameter is a well-formed IPv4 address.
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check_ipaddr() {
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IFS="." read a b c d <<EOF
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$1
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EOF
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for i in "$a" "$b" "$c" "$d" ; do
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if ! [ "$i" -ge 0 -a "$i" -le 255 ]; then
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echo "ERROR: Invalid IP address '$1'" >&2
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exit 1
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fi
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done
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}
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# Check that parameter is a valid IPv4 netmask.
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check_netmask() {
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IFS="." read a b c d <<EOF
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$1
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EOF
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netmask_force_zero=0
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for i in "$a" "$b" "$c" "$d" ; do
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if [ "$netmask_force_zero" = "1" -a "$i" != "0" ]; then
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echo "ERROR: Invalid netmask '$1'" >&2
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exit 1
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fi
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if [ "$i" != "255" ]; then
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netmask_force_zero=1
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netmask_ok=0
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for k in 254 252 248 240 224 192 128 0 ; do
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if [ "$i" = "$k" ]; then
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netmask_ok=1
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fi
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done
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if [ "$netmask_ok" != "1" ]; then
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echo "ERROR: Invalid netmask '$1'" >&2
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exit 1
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fi
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fi
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done
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}
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# Parse IP address options.
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parse_options() {
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while [ -n "$1" ]; do
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case "$1" in
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--mode)
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if [ "$2" != "dhcp" -a "$2" != "static" ]; then
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echo "ERROR: Unknown mode '$2'" >&2
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exit 1
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fi
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MODE="$2"
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;;
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--ipaddr)
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check_ipaddr "$2"
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IPADDR="$2"
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;;
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--netmask)
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check_netmask "$2"
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NETMASK="$2"
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;;
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--gateway)
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[ -z "$2" ] || check_ipaddr "$2"
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GATEWAY="$2"
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;;
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*)
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echo "ERROR: Unknown option '$1'" >&2
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exit 1
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esac
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shift 2
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done
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if [ -z "$MODE" ]; then
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echo "ERROR: Missing mode" >&2
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exit 1
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fi
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if [ "$MODE" = "static" ]; then
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if [ -z "$IPADDR" ]; then
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echo "ERROR: Missing IP address" >&2
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exit 1
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fi
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if [ -z "$NETMASK" ]; then
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echo "ERROR: Missing netmask" >&2
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exit 1
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fi
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else
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IPADDR=""
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NETMASK=""
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GATEWAY=""
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fi
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}
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# Change active IP address configuration.
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ipcfg_config() {
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# Lock to avoid conflicting changes.
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lock_config || exit 1
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echo "Changing active IP address configuration ..."
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write_network_config network_active.conf.new
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mv ${CONFIG_DIR}/network_active.conf.new ${CONFIG_DIR}/network_active.conf
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echo "Shutting down eth0 ..."
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/sbin/ifdown eth0
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sleep 2
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write_network_interfaces
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echo "Starting eth0 ..."
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/sbin/ifup eth0 || exit 1
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}
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# Change the persistent IP address configuration on the SD card.
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ipcfg_save() {
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# Lock to avoid conflicting changes.
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lock_config || exit 1
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echo "Changing saved IP address configuration ..."
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write_network_config network.conf.new || exit 1
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sync_config network.conf || exit 1
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}
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case "$1" in
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init)
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ipcfg_init
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;;
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show)
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ipcfg_show
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;;
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config)
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shift
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parse_options "$@"
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ipcfg_config
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;;
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save)
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shift
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parse_options "$@"
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ipcfg_save
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;;
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*)
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script="${0##*/}"
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cat <<EOF
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Usage: $script {init|show|config|save|restart}
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Manage IP address configuration.
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$script init
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Initialize IP address from saved configuration.
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This command is used during boot and should not be invoked manually.
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$script show
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Display active and saved IP address configuration.
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$script config {options}
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Change active IP address configuration.
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The new configuration is not written to the SD card.
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options:
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--mode dhcp Enable configuration via DHCP.
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--mode static Enable static IP address configuration.
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--ipaddr n.n.n.n Specify static IPv4 address.
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--netmask n.n.n.n Specify netmask.
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--gateway n.n.n.n Specify gateway address, or "" to disable gateway.
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$script save {options}
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Change the saved IP address configuration on the SD card.
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Options are the same as for command 'config'.
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EOF
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exit 1
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;;
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esac
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exit $?
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