Asp下實現限制IP訪問的程式碼_應用技巧

來源:互聯網
上載者:User
<%
''擷取訪問者的地址
ip=Request.ServerVariables("REMOTE_ADDR") 

''允許的IP位址區段為10.0.0.0~10.68.63.255
allowip1="10.0.0.0"
allowip2="10.68.10.71"
response.write checkip(ip,allowip1,allowip2)
function checkip(ip,allowip1,allowip2)
dim check(4)
checkip=false
ipstr=split(ip,".")
allow1=split(allowip1,".")
allow2=split(allowip2,".")
if cint(allow1(0))>cint(allow2(0)) then ''判斷IP位址區段是否合法
response.write "禁止訪問"
exit function
end if
for i=0 to ubound(ipstr)
if cint(allow1(i))<cint(allow2(i)) then
if cint(allow1(i))=cint(ipstr(i)) then
check(i)=true
checkip=true
exit for
else
if cint(ipstr(i))<cint(allow2(i)) then
check(i)=true
checkip=true
exit for
else
if cint(ipstr(i))>cint(allow2(i)) then
check(i)=false
checkip=false
exit for
else
check(i)=true
checkip=true
end if
end if
end if
else
if cint(allow1(i))>cint(ipstr(i)) or cint(allow1(i))<cint(ipstr(i)) then
check(i)=false
checkip=false
if i<>ubound(ipstr) then
exit for
end if
else
check(i)=true
end if
end if
next
if (check(0)=true and check(1)=true and check(2)=true and check(3)=false) and (cint(allow2(2))>cint(ipstr(2))) then
checkip=true
end if
end function
%>
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