'防止注入

以下是引用片段：
dim qs,errc,iii
qs=request.servervariables("query_string")
'response.write(qs)
dim deStr(18)
deStr(0)="net user"
deStr(1)="xp_cmdshell"
deStr(2)="/add"
deStr(3)="exec%20master.dbo.xp_cmdshell"
deStr(4)="net localgroup administrators"
deStr(5)="select"
deStr(6)="count"
deStr(7)="asc"
deStr(8)="char"
deStr(9)="mid"
deStr(10)="'"
deStr(11)=":"
deStr(12)=""""
deStr(13)="insert"
deStr(14)="delete"
deStr(15)="drop"
deStr(16)="truncate"
deStr(17)="from"
deStr(18)="%"
errc=false
for iii= 0 to ubound(deStr)
if instr(qs,deStr(iii))<>0 then
errc=true
end if
next
if errc then
Response.Write("对不起，非法URL地址请求!")
response.end
end if