Attribute VB_Name = "modPing"
'modPing.bas

Option Explicit

Public Const PF_INET = 2
Public Const IP_STATUS_BASE = 11000
Public Const IP_SUCCESS = 0
Public Const IP_BUF_TOO_SMALL = (11000 + 1)
Public Const IP_DEST_NET_UNREACHABLE = (11000 + 2)
Public Const IP_DEST_HOST_UNREACHABLE = (11000 + 3)
Public Const IP_DEST_PROT_UNREACHABLE = (11000 + 4)
Public Const IP_DEST_PORT_UNREACHABLE = (11000 + 5)
Public Const IP_NO_RESOURCES = (11000 + 6)
Public Const IP_BAD_OPTION = (11000 + 7)
Public Const IP_HW_ERROR = (11000 + 8)
Public Const IP_PACKET_TOO_BIG = (11000 + 9)
Public Const IP_REQ_TIMED_OUT = (11000 + 10)
Public Const IP_BAD_REQ = (11000 + 11)
Public Const IP_BAD_ROUTE = (11000 + 12)
Public Const IP_TTL_EXPIRED_TRANSIT = (11000 + 13)
Public Const IP_TTL_EXPIRED_REASSEM = (11000 + 14)
Public Const IP_PARAM_PROBLEM = (11000 + 15)
Public Const IP_SOURCE_QUENCH = (11000 + 16)
Public Const IP_OPTION_TOO_BIG = (11000 + 17)
Public Const IP_BAD_DESTINATION = (11000 + 18)
Public Const IP_ADDR_DELETED = (11000 + 19)
Public Const IP_SPEC_MTU_CHANGE = (11000 + 20)
Public Const IP_MTU_CHANGE = (11000 + 21)
Public Const IP_UNLOAD = (11000 + 22)
Public Const IP_ADDR_ADDED = (11000 + 23)
Public Const IP_GENERAL_FAILURE = (11000 + 50)
Public Const MAX_IP_STATUS = 11000 + 50
Public Const IP_PENDING = (11000 + 255)
Public Const PING_TIMEOUT = 200
Public Const WS_VERSION_REQD = &H101
Public Const WS_VERSION_MAJOR = WS_VERSION_REQD \ &H100 And &HFF&
Public Const WS_VERSION_MINOR = WS_VERSION_REQD And &HFF&
Public Const MIN_SOCKETS_REQD = 1
Public Const SOCKET_ERROR = -1

Public Const MAX_WSADescription = 256
Public Const MAX_WSASYSStatus = 128

Public Type ICMP_OPTIONS
    Ttl             As Byte
    Tos             As Byte
    Flags           As Byte
    OptionsSize     As Byte
    OptionsData     As Long
End Type


Dim ICMPOPT As ICMP_OPTIONS

Public Type ICMP_ECHO_REPLY
    Address         As Long
    status          As Long
    RoundTripTime   As Long
    DataSize        As Integer
    Reserved        As Integer
    DataPointer     As Long
    Options         As ICMP_OPTIONS
    Data            As String * 250
End Type

Public Type HOSTENT
    hName           As Long
    hAliases        As Long
    hAddrType       As Integer
    hLen            As Integer
    hAddrList       As Long
End Type

Public Type WSADATA
    wVersion        As Integer
    wHighVersion    As Integer
    szDescription(0 To MAX_WSADescription) As Byte
    szSystemStatus(0 To MAX_WSASYSStatus) As Byte
    wMaxSockets     As Integer
    wMaxUDPDG       As Integer
    dwVendorInfo    As Long
End Type


Public Declare Function IcmpCreateFile Lib "icmp.dll" () As Long

Public Declare Function IcmpCloseHandle Lib "icmp.dll" (ByVal IcmpHandle As Long) As Long
   
Public Declare Function IcmpSendEcho Lib "icmp.dll" _
                                (ByVal IcmpHandle As Long, _
                                ByVal DestinationAddress As Long, _
                                ByVal RequestData As String, _
                                ByVal RequestSize As Integer, _
                                ByVal RequestOptions As Long, _
                                ReplyBuffer As ICMP_ECHO_REPLY, _
                                ByVal ReplySize As Long, _
                                ByVal Timeout As Long) As Long
    
Public Declare Function WSAGetLastError Lib "wsock32.dll" () As Long

Public Declare Function WSAStartup Lib "wsock32.dll" _
                            (ByVal wVersionRequired As Long, lpWSADATA As WSADATA) As Long
                                    
Public Declare Function WSACleanup Lib "wsock32.dll" () As Long

Public Declare Function gethostbyaddr Lib "wsock32.dll" (addr As Long, _
                            ByVal addr_len As Long, ByVal addr_type As Long) As Long

Public Declare Function gethostname Lib "wsock32.dll" _
                            (ByVal szHost As String, ByVal dwHostLen As Long) As Long
    
Public Declare Function gethostbyname Lib "wsock32.dll" _
                            (ByVal szHost As String) As Long
   
Public Declare Sub RtlMoveMemory Lib "kernel32" (hpvDest As Any, ByVal hpvSource As Long, _
                            ByVal cbCopy As Long)
                                    
Public Declare Function inet_addr Lib "wsock32.dll" (ByVal addr As String) As Long

Public Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" _
                            (hpvDest As Any, ByVal hpvSource As Long, ByVal cbCopy As Long)


Public Function GetStatusCode(status As Long) As String

    Dim msg As String
    
    'Message Boxes
    Select Case status
        Case IP_SUCCESS:               msg = "IP Successful"
        Case IP_BUF_TOO_SMALL:         msg = "IP Buffer Too Small"
        Case IP_DEST_NET_UNREACHABLE:  msg = "IP Destination Net Unreachable"
        Case IP_DEST_HOST_UNREACHABLE: msg = "IP Destination Host Unreachable"
        Case IP_DEST_PROT_UNREACHABLE: msg = "IP Destination Protocol Unreachable"
        Case IP_DEST_PORT_UNREACHABLE: msg = "IP Destination Port Unreachable"
        Case IP_NO_RESOURCES:          msg = "IP No Resources"
        Case IP_BAD_OPTION:            msg = "IP Bad Option"
        Case IP_HW_ERROR:              msg = "IP Hw Error"
        Case IP_PACKET_TOO_BIG:        msg = "IP Packet Too Big"
        Case IP_REQ_TIMED_OUT:         msg = "IP currently timed out"
        Case IP_BAD_REQ:               msg = "IP Bad Request"
        Case IP_BAD_ROUTE:             msg = "IP Bad Route"
        Case IP_TTL_EXPIRED_TRANSIT:   msg = "IP ttl expired transit"
        Case IP_TTL_EXPIRED_REASSEM:   msg = "IP ttl expired reassem"
        Case IP_PARAM_PROBLEM:         msg = "IP Parameter Problem"
        Case IP_SOURCE_QUENCH:         msg = "IP Source Quench"
        Case IP_OPTION_TOO_BIG:        msg = "IP Option too Big"
        Case IP_BAD_DESTINATION:       msg = "IP Bad Destination"
        Case IP_ADDR_DELETED:          msg = "IP addr deleted"
        Case IP_SPEC_MTU_CHANGE:       msg = "IP Spec Mtu Change"
        Case IP_MTU_CHANGE:            msg = "IP Mtu Change"
        Case IP_UNLOAD:                msg = "IP Unload"
        Case IP_ADDR_ADDED:            msg = "IP Address Added"
        Case IP_GENERAL_FAILURE:       msg = "IP General Failure"
        Case IP_PENDING:               msg = "IP Pending"
        Case PING_TIMEOUT:             msg = "Ping Timeout"
        Case Else:                     msg = "Unknown Message Returned!"
    End Select
    
    GetStatusCode = CStr(status) & "   " & msg
   
End Function

Public Function HiByte(ByVal wParam As Integer)
    HiByte = wParam \ &H100 And &HFF&
End Function


Public Function LoByte(ByVal wParam As Integer)
    LoByte = wParam And &HFF&
End Function

Public Function Ping(ByVal szAddress As String, ByVal strData As String, ECHO As ICMP_ECHO_REPLY) As Long

    Dim hPort        As Long
    Dim dwAddress    As Long
    Dim sDataToSend  As String
    Dim iOpt         As Long
       
    sDataToSend = strData
    dwAddress = AddressStringToLong(szAddress)
       
    Call SocketsInitialize
    hPort = IcmpCreateFile()
       
    If IcmpSendEcho(hPort, _
        dwAddress, _
        sDataToSend, _
        Len(sDataToSend), _
        0, _
        ECHO, _
        Len(ECHO), _
        PING_TIMEOUT) Then
        Ping = ECHO.RoundTripTime
    Else: Ping = ECHO.status * -1
    
    End If
                           
    Call IcmpCloseHandle(hPort)
    Call SocketsCleanup
   
End Function
   

Function AddressStringToLong(ByVal tmp As String) As Long

    Dim i As Integer
    Dim parts(1 To 4) As String
       
    i = 0
    
    While InStr(tmp, ".") > 0
        i = i + 1
        parts(i) = Mid(tmp, 1, InStr(tmp, ".") - 1)
        tmp = Mid(tmp, InStr(tmp, ".") + 1)
    Wend
       
    i = i + 1
    parts(i) = tmp
       
    If i <> 4 Then
        AddressStringToLong = 0
        Exit Function
    End If
    
    AddressStringToLong = Val("&H" & Right("00" & Hex(parts(4)), 2) & _
                                    Right("00" & Hex(parts(3)), 2) & _
                                    Right("00" & Hex(parts(2)), 2) & _
                                    Right("00" & Hex(parts(1)), 2))
       
End Function


Public Function SocketsCleanup() As Boolean

    Dim X As Long
    X = WSACleanup()
    If X <> 0 Then
        MsgBox "Windows Sockets error " & Trim$(Str$(X)) & _
        " occurred in Cleanup.", vbExclamation
        SocketsCleanup = False
    Else
        SocketsCleanup = True
    End If
    
End Function


Public Function SocketsInitialize() As Boolean

    Dim WSAD As WSADATA
    Dim X As Integer
    Dim szLoByte As String
    Dim szHiByte As String
    Dim szBuf As String
    
    X = WSAStartup(WS_VERSION_REQD, WSAD)
        
    If X <> 0 Then
        MsgBox "Windows Sockets for 32 bit Windows " & _
        "environments is not successfully responding."
        SocketsInitialize = False
        Exit Function
    End If
        
    If LoByte(WSAD.wVersion) < WS_VERSION_MAJOR Or _
        (LoByte(WSAD.wVersion) = WS_VERSION_MAJOR And _
        HiByte(WSAD.wVersion) < WS_VERSION_MINOR) Then
        
        szHiByte = Trim$(Str$(HiByte(WSAD.wVersion)))
        szLoByte = Trim$(Str$(LoByte(WSAD.wVersion)))
        szBuf = "Windows Sockets Version " & szLoByte & "." & szHiByte
        szBuf = szBuf & " is not supported by Windows " & _
        "Sockets for 32 bit Windows environments."
        MsgBox szBuf, vbExclamation
        SocketsInitialize = False
        Exit Function
    End If
        
    If WSAD.wMaxSockets < MIN_SOCKETS_REQD Then
        szBuf = "This application requires a minimum of " & _
        Trim$(Str$(MIN_SOCKETS_REQD)) & " supported sockets."
        MsgBox szBuf, vbExclamation
        SocketsInitialize = False
        Exit Function
    End If
        
    SocketsInitialize = True
End Function