ip范围限制函数

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‘’******************************
‘’Function CheckIp(cInput_Ip,cBound_Ip)
‘’Created by qqdao, qqdao@263.net 2001/11/28
‘’说明：首先需要根据;号循环，然后判断是否含有"-"，如果有则进行拆分处理，最后判断是否在范围内
‘’参数： cInput_Ip,代检查的ip
‘’    cBound_Ip,给定的范围格式为,单个ip,和范围ip，范围ip最后使用”-“分割，如果是“*”则必须放到最后一位
‘’                每个范围后添加":ALLOW"表示允许登陆，添加":REFUSE"表示拒绝登陆。多个范围用”;“隔开
‘’                 例如192.168.1*.*:ALLOW;192.168.1.1:ALLOW;192.168.1.1-10:REFUSE"
‘’返回值: true/false
‘’更新：2001/12/05  支持ALLOW,REFUSE支持’*‘,不想对？支持，因为和*差不多
‘’******************************
function CheckIp(cInput_Ip,cBound_Ip)
dim cSingle_Ip,cTemp_IP,cStart_IP,cEnd_Ip
    CheckIp = false
    cSingle_Ip=split(cBound_Ip,";")

        for i=0 to ubound(cSingle_Ip)
            if Instr(cSingle_Ip(i),"REFUSE") <> 0 then    ‘’就是拒绝了
                    cTemp_IP = left(cSingle_Ip(i),instr(cSingle_Ip(i),":")-1)
           
            if Instr(cTemp_IP,"*") <> 0 then  ‘’是宽范围
                cStart_IP = left(cTemp_IP,instr(cTemp_IP,"*")-1)
                if left(cInput_Ip,len(cStart_IP))=cStart_IP then
                    CheckIp = false
                    exit function
                end if
                end if

            if Instr(cTemp_IP,"-") = 0 then
            cStart_IP = cTemp_IP
            cEnd_Ip   = cTemp_IP
            else
            cStart_IP = left(cTemp_IP,instr(cTemp_IP,"-")-1)
            cEnd_Ip   = left(cStart_IP,InStrRev(cStart_IP,".")-1)+"."+mid(cTemp_IP,instr(cTemp_IP,"-")+1)
            end if
    
            if     Ip2Str(cInput_Ip)>=Ip2Str(cStart_IP) and Ip2Str(cInput_Ip)<=Ip2Str(cEnd_Ip) then
                CheckIp = false
                exit function
            end if

        elseif Instr(cSingle_Ip(i),"ALLOW") <> 0 then             ‘’允许
                 
                    cTemp_IP = left(cSingle_Ip(i),instr(cSingle_Ip(i),":")-1)
          
            if Instr(cTemp_IP,"*") <> 0 then          ‘’是宽范围
                cStart_IP = left(cTemp_IP,instr(cTemp_IP,"*")-1)
                if left(cInput_Ip,len(cStart_IP))=cStart_IP then
                    CheckIp = true
                end if
                end if

            if Instr(cTemp_IP,"-") = 0 then
            cStart_IP = cTemp_IP
            cEnd_Ip   = cTemp_IP
            else
            cStart_IP = left(cTemp_IP,instr(cTemp_IP,"-")-1)
            cEnd_Ip   = left(cStart_IP,InStrRev(cStart_IP,".")-1)+"."+mid(cTemp_IP,instr(cTemp_IP,"-")+1)
            end if
    
            if     Ip2Str(cInput_Ip)>=Ip2Str(cStart_IP) and Ip2Str(cInput_Ip)<=Ip2Str(cEnd_Ip) then
                CheckIp =true
            else
                CheckIp =false
            end if
        end if
       next

end function


‘’******************************
‘’Function Ip2Str(cIp)
‘’Created by qqdao, qqdao@263.net 2001/11/28
‘’参考动网ip算法
‘’参数：cIp ip地址
‘’返回值: 转换后数值
‘’******************************
function Ip2Str(cIp)
    Dim str1,str2,str3,str4
    Dim cIp_Temp
    if cIp="127.0.0.1" then cIp="192.168.0.1"
        str1=left(cIp,instr(cIp,".")-1)
        cIp_Temp=mid(cIp,instr(cIp,".")+1)
        str2=left(cIp_Temp,instr(cIp_Temp,".")-1)
        cIp_Temp=mid(cIp_Temp,instr(cIp_Temp,".")+1)
        str3=left(cIp_Temp,instr(cIp_Temp,".")-1)
        str4=mid(cIp_Temp,instr(cIp_Temp,".")+1)

    if isNumeric(str1)=0 or isNumeric(str2)=0 or isNumeric(str3)=0 or isNumeric(str4)=0 then

    else
            Ip2Str=cint(str1)*256*256*256+cint(str2)*256*256+cint(str3)*256+cint(str4)-1
    end if

end function

原文转自：http://www.ltesting.net