ASP中对IP进行过滤限制函数

<%

’获取访问者的地址

ip=Request.ServerVariables("REMOTE_ADDR")

’允许的IP地址段为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 ’判断IP地址段是否合法

response.write "IP地址段出错！"

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

%>