ASP中实现限制IP的函数详解
时间:2021-07-01 10:21:17
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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