WhyCan Forum(哇酷开发者社区)

#!/bin/sh

mkdir -p /var/lib/dhcp
dh_conf="/var/cache/dhclient.conf"
sys_static_conf="/etc/static_ip.conf"
static_conf="/data/etc/static_ip.conf"
watch_conf="/data/etc/watch.conf"

link_watch=yes
link_watch_timeout=20
ip_watch=yes
ip_watch_timeout=40

link_nego_timeout=10
eth=eth0
wlan=wlan0

if [ -f $watch_conf ]; then
    source $watch_conf
fi

if [ -f $sys_static_conf ] && ! [ -f $static_conf ]; then
    mkdir -p $(dirname $static_conf)
    cp $sys_static_conf $static_conf
fi

test -r $static_conf && source $static_conf

watch_eth() {
    count=0
    while true; do
        sleep 5
        if mii-tool $eth 2>&1 | grep "link ok" > /dev/null; then
            count=0
        else
            if [ $count -lt $link_watch_timeout ]; then
                count=$(($count + 5))
                logger -t ethernet -s "disconnected"
            else
                logger -t ethernet -s "disconnected for $link_watch_timeout seconds, rebooting"
                reboot
            fi
        fi
    done
}

watch_ip() {
    iface=$1
    count=0
    while true; do
        sleep 5
        if ip addr show dev $iface | grep inet &>/dev/null; then
            count=0
        else
            if [ $count -lt $ip_watch_timeout ]; then
                count=$(($count + 5))
                logger -t network -s "$iface has no IP address"
            else
                logger -t network -s "$iface had no IP address for $ip_watch_timeout seconds, rebooting"
                reboot
            fi
        fi
    done
}

start_lo() {
    ifconfig lo up
}

start_wlan() {
    if ! ifconfig $wlan >/dev/null 2>&1; then
        echo "$wlan: no device"
        return
    fi

    if [ "$(cat /sys/class/net/$wlan/carrier 2>/dev/null)" != "1" ]; then
        echo "$wlan: no link"
        return
    fi

    if [ -n "$static_ip" ]; then
        echo "$wlan: setting static IP to $static_ip"
        ifconfig $wlan $static_ip up
        static_ip="" # won't be used again
    else
        echo "$wlan: starting dhclient"
        dhclient -cf "$dh_conf" $wlan
    fi

    if [ "$ip_watch" == "yes" ]; then
        watch_ip $wlan &
    fi
}

start_eth() {
    # wait up to 3 seconds for driver
    count=0
    while ! ifconfig $eth >/dev/null 2>&1; do
        sleep 1
        count=$(($count + 1))
        if [ $count -ge 3 ]; then
            echo "$eth: no device"
            return
        fi
    done

    # bring it up
    ifconfig $eth up

    # wait up to 3 seconds for operstate
    count=0
    while [ "$(cat /sys/class/net/$eth/operstate 2>&1)" == "unknown" ]; do
        sleep 1
        count=$(($count + 1))
        if [ $count -ge    3 ]; then
            echo "$eth: no link"
            return
        fi
    done

    # wait up to link_nego_timeout seconds for link
    count=0
    while [ "$(cat /sys/class/net/$eth/carrier 2>&1)" != "1" ]; do
        sleep 1
        count=$(($count + 1))
        if [ $count -ge $link_nego_timeout ]; then
            echo "$eth: no link"
            return
        fi
    done

    if [ -n "$static_ip" ]; then
        echo "$eth: setting static IP to $static_ip"
        ifconfig $eth $static_ip up
        static_ip="" # won't be used again
    else
        echo "$eth: starting dhclient"
        dhclient -cf "$dh_conf" $eth
    fi

    if [ "$link_watch" == "yes" ]; then
        watch_eth &
    fi

    if [ "$ip_watch" == "yes" ]; then
        watch_ip $eth &
    fi
}

start() {
    hostname=$(hostname)
    echo "send host-name = \"$hostname\";" > /var/cache/dhclient.conf

    start_lo
    start_wlan
    
    # if wifi or ppp connection configured, start eth in background
    ssid=$(cat /data/etc/wpa_supplicant.conf 2>&1 | grep ssid | grep -v scan_ssid | cut -d '"' -f 2)
    if [ -n "$ssid" ] || [ -r /data/etc/ppp/modem ]; then
        start_eth &>/dev/null &
    else
        start_eth
    fi

    if [ -n "$static_gw" ]; then
        echo "setting static gateway to $static_gw"
        ip route add default via $static_gw
    fi

    if [ -n "$static_dns" ]; then
        echo "setting static DNS server to $static_dns"
        echo "nameserver $static_dns" > /etc/resolv.conf
    fi

    # print the current network configuration
    ifconfig -a
}

case "$1" in
    start)
        echo -n "Starting network: "
        start
        echo "done"
        ;;

    stop)
        echo -n "Stopping network: "
        killall dhclient
        ps | grep S40network | grep -v $$ | grep -v grep | tr -s ' ' | sed -e 's/^\s//' | cut -d ' ' -f 1 | xargs -r kill
        echo "done"
        ;;

    restart|reload)
        "$0" stop
        "$0" start
        ;;

    *)
        echo "Usage: $0 {start|stop|restart}"
        exit 1
esac

exit $?

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
      address 192.168.42.2
      netmask 255.255.255.0