[VB. NET] queries IP addresses through the IPIP. NET database, vb.netipip.net

[VB. NET] queries IP addresses through the IPIP. NET database, vb.netipip.net

The last time I introduced how to Query IP address details using a pure database.
However, pure databases are provided by feedback from netizens, and many data descriptions are not accurate. Therefore, I went online to find some other IP database and finally found the IP database provided by ipip.net.

The IP address provides two versions of the database: paid and free. We can directly use the free version.
Https://www.ipip.net/download.html (you need to register an account first)
The compressed package contains a PHP parsing class, And a 17monipdb. dat file is the database. We only need to use it.

Copy 17monipdb. dat to the main directory of the program and use the following code:

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

This code is translated from the official C # version, and some redundant code is removed, leaving only core functions.
No tests have been conducted. If you have any bugs, please submit them to me.

 

The usage is simple:

Dim ret = IPIP. Find ("127.0.0.1") 'Use line breaks to separate all information. Dim ipdesc = String. Join (vbCrLf, ret)