上一次介紹了利用純真資料庫查詢IP地址詳細資料的方法。
然而純真資料庫是由網友反饋所提供的,很多資料描述並不準確,所以我上網找了一些其他的IP資料庫,最後就找到了 ipip.net 這個網站所提供的IP資料庫。
IPIP所提供的資料庫有付費和免費兩個版本,我們可以直接使用其中的免費版本。
下載地址 https://www.ipip.net/download.html (需要先註冊一個帳號)
壓縮包內有一個PHP的解析類,還有一個 17monipdb.dat 檔案就是資料庫了,我們只需要用到它就可以了。
將 17monipdb.dat 複製到程式的主目錄,使用下面的代碼:
Imports System.IOImports System.TextPublic Class IPIP Shared offset As Integer Shared index As UInteger() = New UInteger(255) {} Shared dataBuffer As Byte() Shared indexBuffer As Byte() Shared lastModifyTime As Long = 0L Shared ipFile As String Shared rwlock As New Threading.ReaderWriterLock Shared Sub New() Load("17monipdb.dat") End Sub Shared Sub Load(ByVal filename As String) ipFile = New FileInfo(filename).FullName Load() End Sub Shared Sub Load() rwlock.AcquireWriterLock(-1) Dim fi As New FileInfo(ipFile) lastModifyTime = fi.LastWriteTime.Ticks Try dataBuffer = File.ReadAllBytes(fi.FullName) Dim indexLength = BytesToLong(dataBuffer(0), dataBuffer(1), dataBuffer(2), dataBuffer(3)) indexBuffer = New Byte(indexLength - 1) {} Array.Copy(dataBuffer, 4, indexBuffer, 0, indexLength) offset = CType(indexLength, Integer) For lp As Integer = 0 To 255 index(lp) = BytesToLong( _ indexBuffer(lp * 4 + 3), _ indexBuffer(lp * 4 + 2), _ indexBuffer(lp * 4 + 1), _ indexBuffer(lp * 4) _ ) Next Catch ex As Exception Throw ex End Try rwlock.ReleaseWriterLock() End Sub Private Shared Function BytesToLong(ByVal a As Byte, ByVal b As Byte, ByVal c As Byte, ByVal d As Byte) As UInteger Return (CType(a, UInteger) << 24) Or (CType(b, UInteger) << 16) Or (CType(c, UInteger) << 8) Or d End Function Shared Function Find(ByVal ip As String) As String() rwlock.AcquireReaderLock(-1) Dim ips = ip.Split(".") Dim ip_prefix_value = Integer.Parse(ips(0)) Dim ip2long_value As Long = BytesToLong(Byte.Parse(ips(0)), Byte.Parse(ips(1)), Byte.Parse(ips(2)), Byte.Parse(ips(3))) Dim start = index(ip_prefix_value) Dim max_comp_len = offset - 1028 Dim index_offset As Long = -1L Dim index_length As Integer = -1 Dim b As Byte = 0 start = start * 8 + 1024 While start < max_comp_len If BytesToLong(indexBuffer(start + 0), indexBuffer(start + 1), indexBuffer(start + 2), indexBuffer(start + 3)) >= ip2long_value Then index_offset = BytesToLong(b, indexBuffer(start + 6), indexBuffer(start + 5), indexBuffer(start + 4)) index_length = &HFF And indexBuffer(start + 7) Exit While End If start += 8 End While Dim areaBytes = New Byte(index_length - 1) {} Array.Copy(dataBuffer, offset + index_offset - 1024, areaBytes, 0, index_length) Dim ret As String() = Encoding.UTF8.GetString(areaBytes).Split(vbTab) rwlock.ReleaseReaderLock() Return ret End Function End Class
此代碼是我從官方提供的C#版本翻譯過來的,並且去除了一些冗餘代碼,只留下核心功能。
未經過完全的測試,有BUG請反饋給我。
使用方法很簡單:
Dim ret = IPIP.Find("127.0.0.1"' 用換行分隔所有資訊Dim ipdesc = String.Join(vbCrLf, ret)