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[脚本语言] linux开设无线热点的shell脚本

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    [LV.9]以坛为家II

    #!/bin/bash

    #####################################
    #Author: 定位                  #
    #email: cnblackhat@qq.com       #
    #QQ: 1074189538                     #
    #Version: 1.0                       #
    #Note: If you have some GOOD ideas  #
    #      or advice, please mail me^^  #
    #Modified: cnblackhat@ 2016-10-20 #
    #          (cnblackhat@qq.com)    #
    #####################################

    #####################################
    ShareNet=eth0
    Wmode=ad-hoc
    Wchannel=auto
    Wessid=WiFi-Network
    WInterface=$1
    # the length of encrypted key is determined by device,
    # running `sudo iwlist interface keys` to check
    # the supported length
    WPasskey=
    Wkey=off
    Igateway=192.168.2.254
    Inetmask=255.255.255.0
    Inetwork=192.168.2.0
    DhcpRangeMin=192.168.2.10
    DhcpRangeMax=192.168.2.105
    #####################################

    adhocFolder=/etc/adhoc
    dnsmasqFile=$adhocFolder/dnsmasq.conf
    resolvFile=/etc/resolv.conf
    dnsmasqPid=/var/run/dnsmasq.pid
    dnsmasqLeases=/var/run/dnsmasq.leases

    # run command and print error message
    function run_command
    {
      local command="$1"
      local msg
      msg=$(${command} 2>&1)
      sleep 0.5
      if [ $? -ne 0 ]; then
        echo -e "    [ \033[31mFAILED\033[0m ]"
        echo    "    ${msg}"
        exit 1
      else
        echo -e "    [ GOOD ]"
      fi
    }

    # start Ad-hoc
    function adhoc_start
    {
      echo "Starting Ad-hoc..."
      check_dnsmasq
      sleep 0.5

      echo -n "Setting $WInterface gateway[$Igateway] and netmask[$Inetmask]..."
      run_command "ifconfig $WInterface $Igateway netmask $Inetmask"

      echo -n "Setting down $WInterface..."
      run_command "ifconfig $WInterface down"
      # only is wlan0 shut down, you can set mode
      echo -n "Setting $WInterface mode[$Wmode]..."
      run_command "iwconfig $WInterface mode $Wmode"

      echo -n "Setting $WInterface essid[$Wessid]..."
      run_command "iwconfig $WInterface essid $Wessid"

      echo -n "Setting $WInterface channel[$Wchannel]..."
      run_command "iwconfig $WInterface channel $Wchannel"

      if [ -n "$WPasskey" ]; then
        Wkey="restricted"
        echo -n "Setting $WInterface password[$WPasskey]..."
        run_command "iwconfig $WInterface key sWPasskey"
      else
        Wkey="off"
      fi

      echo -n "Setting $WInterface key type[$Wkey]..."
      run_command "iwconfig $WInterface key $Wkey"
      if [ "$Wkey" = "off" ]; then
        echo -e "    [ \033[31mWARNING\033[0m, non-encrypted network ]"
      fi

      echo -n "Setting up $WInterface..."
      run_command "ifconfig $WInterface up"

      echo "Setting iptable:"
      #remove the old rules
      echo -n "    remove old rules..."
      iptables -N wireless-adhoc
      iptables -F wireless-adhoc
      iptables -t nat -F PREROUTING
      iptables -t nat -F POSTROUTING
      iptables -t nat -F
      echo "    [ GOOD ]"
      #bring up the NAT rules
      echo -n "    bring up NAT rules..."
      iptables -A wireless-adhoc -m state --state ESTABLISHED,RELATED -j ACCEPT
      iptables -A wireless-adhoc -s $Inetwork/24 -j ACCEPT
      iptables -A wireless-adhoc -p 47 -j ACCEPT
      iptables -A wireless-adhoc -j DROP
      iptables -A FORWARD -m state --state INVALID -j DROP
      iptables -A FORWARD -j wireless-adhoc
      iptables -t nat -I POSTROUTING -s $Inetwork/24 -j MASQUERADE
      echo "    [ GOOD ]"

      sh -c "echo 1 > /proc/sys/net/ipv4/ip_forward"

      echo -n "Starting DNS and DHCP server..."
      run_command "dnsmasq -i $WInterface \
                            --resolv-file=$resolvFile \
                            --conf-file=$dnsmasqFile"
      echo "Completed!^^"
    }

    function wait_a_moment
    {
      sleep 0.5
      echo -n "."
    }

    # stop Ad-hoc
    function adhoc_stop
    {
      echo "Stopping adhoc ..."
      sh -c "echo 0 > /proc/sys/net/ipv4/ip_forward"
      echo -n "."
      # only is wlan0 shut down, you can set mode
      ifconfig $WInterface down
      wait_a_moment

      # stop adhoc mode
      iwconfig $WInterface mode managed
      wait_a_moment

      iwconfig $WInterface key off
      wait_a_moment

      iwconfig $WInterface essid any
      wait_a_moment

      # remove iptabled rules
      iptables -D FORWARD -j wireless-adhoc
      iptables -D FORWARD -m state --state INVALID -j DROP
      iptables -F wireless-adhoc
      iptables -X wireless-adhoc
      iptables -t nat -F PREROUTING
      iptables -t nat -F POSTROUTING
      iptables -t nat -F
      wait_a_moment

      if [ -f $dnsmasqPid ]; then
        dnsmasqID=`cat $dnsmasqPid`
        kill $dnsmasqID
      fi
      if [ -f $dnsmasqLeases ]; then
        rm $dnsmasqLeases
      fi
      echo -e "\nWifi ad-hoc now stopped"
    }

    function adhoc_restart
    {
      echo "Now, resart Ad-hoc ..."
      adhoc_stop
      sleep 1
      adhoc_start
    }
    # check dnsmasq.conf
    function check_dnsmasq
    {

      if [ -f $dnsmasqPid ]; then
        echo "DHCP server is running!"
        echo "Now, restart Ad-hoc"
        adhoc_stop
      fi
      if [ ! -d $adhocFolder ]; then
        mkdir $adhocFolder
      fi

      if [ ! -f $dnsmasqFile ]; then
        echo "$dnsmasqFile is not exist, now building."

        echo "dhcp-authoritative" > $dnsmasqFile
        echo "dhcp-range=$DhcpRangeMin,$DhcpRangeMax,12h" >> $dnsmasqFile
        echo "dhcp-leasefile=$dnsmasqLeases" >> $dnsmasqFile
        echo "pid-file=$dnsmasqPid" >> $dnsmasqFile
        echo "user=root" >> $dnsmasqFile
        echo "no-negcache" >> $dnsmasqFile
      fi
    }

    # is super user?
    function super_user
    {
      if [ "$UID" = "0" ]; then
        return 0
      else
        return 1
      fi
    }

    # check whether encrypted key has supported length or not
    function check_key_size
    {
      local key=$1
      if [[ -n $key ]]; then
        local key_bit_sizes=$(iwlist ${WInterface} keys \
                            | grep "sizes" \
                            | sed "s/.*: *\(.*\)bits/\1/; s/,/ /")
        local key_byte_sizes
        local wrong_key=1
        local size
        for size in ${key_bit_sizes}; do
          key_byte_sizes="${key_byte_sizes},$((size/8))"
          if ((${#key} == ${size}/8)); then
            wrong_key=0
          fi
        done
        if ((${wrong_key})); then
          echo "Encrypted key must have ${key_byte_sizes#,} characters."
          exit 1
        fi
      fi
    }

    # check whether the specified wifi interface is valid or not
    function check_wifi_interface
    {
      local wifi="$1"
      local interfaces=$(iwconfig 2> /dev/null \
                              | grep "ESSID" \
                              | sed "s/^\([^ ]\{1,\}\).*/\1/")
      if [ -z "${interfaces}" ]; then
        echo "It seems that you haven't any WiFi device!"
        exit 1
      fi
      local inf
      for inf in ${interfaces}; do
        if [ "${wifi}" = "${inf}" ]; then
          return 0
        fi
      done
      echo "Maybe \"${wifi}\" is not a WiFi device which you have."
      echo "Detected WiFi devices following:"
      for inf in ${interfaces}; do
        echo -n "    ${inf}"
      done
      echo
      exit 1
    }

    function usage
    {
      local program=$(echo $0 | sed "s/.*\/\([^\/]*\)$/\1/")
      echo "             Wifi Ad-hoc Control"
      echo
      echo "Usage:"
      echo "    ${program} interface [essid X] [key K] (start|stop|restart)"
      echo
      echo "Description:"
      echo "    essid    The name of your network, default \"$Wessid\"."
      echo "    key      The encryption key of your network,"
      echo "             you can use any ASCII string,"
      echo "             if not set, your network will be non-encrypted."
      echo "    start    Start creating Wifi Ad-hoc Network."
      echo "    stop     Stop Wifi Ad-hoc Network."
      echo "    restart  Restart creating Wifi Ad-hoc Network."
    }

    if [ $# -lt 1 ]; then
      usage
      exit 1
    fi
    if ! super_user ; then
      echo "Need super user permission!"
      exit 1
    fi

    check_wifi_interface "$WInterface"

    shift
    while [[ -n $1 ]]; do
      case $1 in
        essid)  shift
                Wessid=$1
                ;;
        key)    shift
                WPasskey=$1
                check_key_size "${WPasskey}"
                ;;
        stop)   Action="stop"
                ;;
        restart) Action="restart"
                ;;
        start) Action="start"
                ;;
        *)      usage
                exit 1
                ;;
      esac
      shift
    done
    case $Action in
      stop)     adhoc_stop
                ;;
      restart)  adhoc_restart
                ;;
      start)    adhoc_start
                ;;
      *)        usage
    esac


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