wsksock.bas

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Attribute VB_Name = "wsksock"
Option Explicit

Public Const FD_SETSIZE = 64
Type fd_set
    fd_count As Integer
    fd_array(FD_SETSIZE) As Integer
End Type

Type timeval
    tv_sec As Long
    tv_usec As Long
End Type

Type HostEnt
    h_name As Long
    h_aliases As Long
    h_addrtype As Integer
    h_length As Integer
    h_addr_list As Long
End Type
Public Const hostent_size = 16

Type servent
    s_name As Long
    s_aliases As Long
    s_port As Integer
    s_proto As Long
End Type
Public Const servent_size = 14

Type protoent
    p_name As Long
    p_aliases As Long
    p_proto As Integer
End Type

Public Const protoent_size = 10

Public Const IPPROTO_TCP = 6
Public Const IPPROTO_UDP = 17

Public Const INADDR_NONE = &HFFFFFFFF
Public Const INADDR_ANY = &H0

Type sockaddr
    sin_family As Integer
    sin_port As Integer
    sin_addr As Long
    sin_zero As String * 8
End Type

Public Const sockaddr_size = 16
Public saZero As sockaddr

Public Const WSA_DESCRIPTIONLEN = 256
Public Const WSA_DescriptionSize = WSA_DESCRIPTIONLEN + 1

Public Const WSA_SYS_STATUS_LEN = 128
Public Const WSA_SysStatusSize = WSA_SYS_STATUS_LEN + 1

Type WSADataType
    wVersion As Integer
    wHighVersion As Integer
    szDescription As String * WSA_DescriptionSize
    szSystemStatus As String * WSA_SysStatusSize
    iMaxSockets As Integer
    iMaxUdpDg As Integer
    lpVendorInfo As Long
End Type

Public Const INVALID_SOCKET = -1
Public Const SOCKET_ERROR = -1

Public Const SOCK_STREAM = 1
Public Const SOCK_DGRAM = 2

Public Const MAXGETHOSTSTRUCT = 1024

Public Const AF_INET = 2
Public Const PF_INET = 2

Type LingerType
    l_onoff As Integer
    l_linger As Integer
End Type

' Windows Sockets definitions of regular Microsoft C error constants
Global Const WSAEINTR = 10004
Global Const WSAEBADF = 10009
Global Const WSAEACCES = 10013
Global Const WSAEFAULT = 10014
Global Const WSAEINVAL = 10022
Global Const WSAEMFILE = 10024

' Windows Sockets definitions of regular Berkeley error constants
Global Const WSAEWOULDBLOCK = 10035
Global Const WSAEINPROGRESS = 10036
Global Const WSAEALREADY = 10037
Global Const WSAENOTSOCK = 10038
Global Const WSAEDESTADDRREQ = 10039
Global Const WSAEMSGSIZE = 10040
Global Const WSAEPROTOTYPE = 10041
Global Const WSAENOPROTOOPT = 10042
Global Const WSAEPROTONOSUPPORT = 10043
Global Const WSAESOCKTNOSUPPORT = 10044
Global Const WSAEOPNOTSUPP = 10045
Global Const WSAEPFNOSUPPORT = 10046
Global Const WSAEAFNOSUPPORT = 10047
Global Const WSAEADDRINUSE = 10048
Global Const WSAEADDRNOTAVAIL = 10049
Global Const WSAENETDOWN = 10050
Global Const WSAENETUNREACH = 10051
Global Const WSAENETRESET = 10052
Global Const WSAECONNABORTED = 10053
Global Const WSAECONNRESET = 10054
Global Const WSAENOBUFS = 10055
Global Const WSAEISCONN = 10056
Global Const WSAENOTCONN = 10057
Global Const WSAESHUTDOWN = 10058
Global Const WSAETOOMANYREFS = 10059
Global Const WSAETIMEDOUT = 10060
Global Const WSAECONNREFUSED = 10061
Global Const WSAELOOP = 10062
Global Const WSAENAMETOOLONG = 10063
Global Const WSAEHOSTDOWN = 10064
Global Const WSAEHOSTUNREACH = 10065
Global Const WSAENOTEMPTY = 10066
Global Const WSAEPROCLIM = 10067
Global Const WSAEUSERS = 10068
Global Const WSAEDQUOT = 10069
Global Const WSAESTALE = 10070
Global Const WSAEREMOTE = 10071

' Extended Windows Sockets error constant definitions
Global Const WSASYSNOTREADY = 10091
Global Const WSAVERNOTSUPPORTED = 10092
Global Const WSANOTINITIALISED = 10093
Global Const WSAHOST_NOT_FOUND = 11001
Global Const WSATRY_AGAIN = 11002
Global Const WSANO_RECOVERY = 11003
Global Const WSANO_DATA = 11004
Global Const WSANO_ADDRESS = 11004

'---ioctl Constants
    Public Const FIONREAD = &H8004667F
    Public Const FIONBIO = &H8004667E
    Public Const FIOASYNC = &H8004667D

'---Windows System Functions
    Public Declare Function PostMessage Lib "user32" Alias "PostMessageA" (ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
    Public Declare Sub MemCopy Lib "kernel32" Alias "RtlMoveMemory" (Dest As Any, Src As Any, ByVal cb&)
    Public Declare Function lstrlen Lib "kernel32" Alias "lstrlenA" (ByVal lpString As Any) As Long

'---async notification constants
    Public Const SOL_SOCKET = &HFFFF&
    Public Const SO_LINGER = &H80&
    Public Const FD_READ = &H1&
    Public Const FD_WRITE = &H2&
    Public Const FD_OOB = &H4&
    Public Const FD_ACCEPT = &H8&
    Public Const FD_CONNECT = &H10&
    Public Const FD_CLOSE = &H20&

'---SOCKET FUNCTIONS
    Public Declare Function accept Lib "wsock32.dll" (ByVal s As Long, addr As sockaddr, addrlen As Long) As Long
    Public Declare Function bind Lib "wsock32.dll" (ByVal s As Long, addr As sockaddr, ByVal namelen As Long) As Long
    Public Declare Function closesocket Lib "wsock32.dll" (ByVal s As Long) As Long
    Public Declare Function connect Lib "wsock32.dll" (ByVal s As Long, addr As sockaddr, ByVal namelen As Long) As Long
    Public Declare Function ioctlsocket Lib "wsock32.dll" (ByVal s As Long, ByVal cmd As Long, argp As Long) As Long
    Public Declare Function getpeername Lib "wsock32.dll" (ByVal s As Long, sName As sockaddr, namelen As Long) As Long
    Public Declare Function getsockname Lib "wsock32.dll" (ByVal s As Long, sName As sockaddr, namelen As Long) As Long
    Public Declare Function getsockopt Lib "wsock32.dll" (ByVal s As Long, ByVal level As Long, ByVal optname As Long, optval As Any, optlen As Long) As Long
    Public Declare Function htonl Lib "wsock32.dll" (ByVal hostlong As Long) As Long
    Public Declare Function htons Lib "wsock32.dll" (ByVal hostshort As Long) As Integer
    Public Declare Function inet_addr Lib "wsock32.dll" (ByVal cp As String) As Long
    Public Declare Function inet_ntoa Lib "wsock32.dll" (ByVal inn As Long) As Long
    Public Declare Function listen Lib "wsock32.dll" (ByVal s As Long, ByVal backlog As Long) As Long
    Public Declare Function ntohl Lib "wsock32.dll" (ByVal netlong As Long) As Long
    Public Declare Function ntohs Lib "wsock32.dll" (ByVal netshort As Long) As Integer
    Public Declare Function recv Lib "wsock32.dll" (ByVal s As Long, ByVal buf As Any, ByVal buflen As Long, ByVal flags As Long) As Long
    Public Declare Function recvfrom Lib "wsock32.dll" (ByVal s As Long, buf As Any, ByVal buflen As Long, ByVal flags As Long, from As sockaddr, fromlen As Long) As Long
    Public Declare Function ws_select Lib "wsock32.dll" Alias "select" (ByVal nfds As Long, readfds As fd_set, writefds As fd_set, exceptfds As fd_set, timeout As timeval) As Long
    Public Declare Function send Lib "wsock32.dll" (ByVal s As Long, buf As Any, ByVal buflen As Long, ByVal flags As Long) As Long
    Public Declare Function sendto Lib "wsock32.dll" (ByVal s As Long, buf As Any, ByVal buflen As Long, ByVal flags As Long, to_addr As sockaddr, ByVal tolen As Long) As Long
    Public Declare Function setsockopt Lib "wsock32.dll" (ByVal s As Long, ByVal level As Long, ByVal optname As Long, optval As Any, ByVal optlen As Long) As Long
    Public Declare Function ShutDown Lib "wsock32.dll" Alias "shutdown" (ByVal s As Long, ByVal how As Long) As Long
    Public Declare Function socket Lib "wsock32.dll" (ByVal af As Long, ByVal s_type As Long, ByVal protocol As Long) As Long

'---DATABASE FUNCTIONS
    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 gethostbyname Lib "wsock32.dll" (ByVal host_name As String) As Long
    Public Declare Function gethostname Lib "wsock32.dll" (ByVal host_name As String, ByVal namelen As Long) As Long
    Public Declare Function getservbyport Lib "wsock32.dll" (ByVal Port As Long, ByVal proto As String) As Long
    Public Declare Function getservbyname Lib "wsock32.dll" (ByVal serv_name As String, ByVal proto As String) As Long
    Public Declare Function getprotobynumber Lib "wsock32.dll" (ByVal proto As Long) As Long
    Public Declare Function getprotobyname Lib "wsock32.dll" (ByVal proto_name As String) As Long

'---WINDOWS EXTENSIONS
    Public Declare Function WSAStartup Lib "wsock32.dll" (ByVal wVR As Long, lpWSAD As WSADataType) As Long
    Public Declare Function WSACleanup Lib "wsock32.dll" () As Long
    Public Declare Sub WSASetLastError Lib "wsock32.dll" (ByVal iError As Long)
    Public Declare Function WSAGetLastError Lib "wsock32.dll" () As Long
    Public Declare Function WSAIsBlocking Lib "wsock32.dll" () As Long
    Public Declare Function WSAUnhookBlockingHook Lib "wsock32.dll" () As Long
    Public Declare Function WSASetBlockingHook Lib "wsock32.dll" (ByVal lpBlockFunc As Long) As Long
    Public Declare Function WSACancelBlockingCall Lib "wsock32.dll" () As Long
    Public Declare Function WSAAsyncGetServByName Lib "wsock32.dll" (ByVal hWnd As Long, ByVal wMsg As Long, ByVal serv_name As String, ByVal proto As String, buf As Any, ByVal buflen As Long) As Long
    Public Declare Function WSAAsyncGetServByPort Lib "wsock32.dll" (ByVal hWnd As Long, ByVal wMsg As Long, ByVal Port As Long, ByVal proto As String, buf As Any, ByVal buflen As Long) As Long
    Public Declare Function WSAAsyncGetProtoByName Lib "wsock32.dll" (ByVal hWnd As Long, ByVal wMsg As Long, ByVal proto_name As String, buf As Any, ByVal buflen As Long) As Long
    Public Declare Function WSAAsyncGetProtoByNumber Lib "wsock32.dll" (ByVal hWnd As Long, ByVal wMsg As Long, ByVal number As Long, buf As Any, ByVal buflen As Long) As Long
    Public Declare Function WSAAsyncGetHostByName Lib "wsock32.dll" (ByVal hWnd As Long, ByVal wMsg As Long, ByVal host_name As String, buf As Any, ByVal buflen As Long) As Long
    Public Declare Function WSAAsyncGetHostByAddr Lib "wsock32.dll" (ByVal hWnd As Long, ByVal wMsg As Long, addr As Long, ByVal addr_len As Long, ByVal addr_type As Long, buf As Any, ByVal buflen As Long) As Long
    Public Declare Function WSACancelAsyncRequest Lib "wsock32.dll" (ByVal hAsyncTaskHandle As Long) As Long
    Public Declare Function WSAAsyncSelect Lib "wsock32.dll" (ByVal s As Long, ByVal hWnd As Long, ByVal wMsg As Long, ByVal lEvent As Long) As Long
    Public Declare Function WSARecvEx Lib "wsock32.dll" (ByVal s As Long, buf As Any, ByVal buflen As Long, ByVal flags As Long) As Long

'Public Declare Function InternetGetConnectedState _
                  Lib "wininet.dll" (ByRef lpdwFlags As Long, _
                  ByVal dwReserved As Long) As Long

Public MySocket%
Public SockReadBuffer$
Public Const WSA_NoName = "Unknown"
Public WSAStartedUp As Boolean     'Flag to keep track of whether winsock WSAStartup wascalled

Public Function WSAGetAsyncBufLen(ByVal lParam As Long) As Long
    If (lParam And &HFFFF&) > &H7FFF Then
        WSAGetAsyncBufLen = (lParam And &HFFFF&) - &H10000
    Else
        WSAGetAsyncBufLen = lParam And &HFFFF&
    End If
End Function

Public Function WSAGetSelectEvent(ByVal lParam As Long) As Integer
    If (lParam And &HFFFF&) > &H7FFF Then
        WSAGetSelectEvent = (lParam And &HFFFF&) - &H10000
    Else
        WSAGetSelectEvent = lParam And &HFFFF&
    End If
End Function

Public Function WSAGetAsyncError(ByVal lParam As Long) As Integer
    WSAGetAsyncError = (lParam And &HFFFF0000) \ &H10000
End Function

Public Function AddrToIP(ByVal AddrOrIP$) As String
    AddrToIP$ = GetAscIP(GetHostByNameAlias(AddrOrIP$))
End Function

Function ConnectSock(ByVal Host$, ByVal Port&, retIpPort$, ByVal HWndToMsg&, ByVal Async%) As Long
    Dim s&, SelectOps&, dummy&
    Dim sockin As sockaddr
    SockReadBuffer$ = ""
    sockin = saZero
    sockin.sin_family = AF_INET
    sockin.sin_port = htons(Port)
    If sockin.sin_port = INVALID_SOCKET Then
        ConnectSock = INVALID_SOCKET
        Exit Function
    End If

    sockin.sin_addr = GetHostByNameAlias(Host$)
    If sockin.sin_addr = INADDR_NONE Then
        ConnectSock = INVALID_SOCKET
        Exit Function
    End If
    retIpPort$ = GetAscIP$(sockin.sin_addr) & ":" & ntohs(sockin.sin_port)

    s = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)
    If s < 0 Then
        ConnectSock = INVALID_SOCKET
        Exit Function
    End If
    If SetSockLinger(s, 1, 0) = SOCKET_ERROR Then
        If s > 0 Then
            dummy = closesocket(s)
        End If
        ConnectSock = INVALID_SOCKET
        Exit Function
    End If
    If Not Async Then
        If Not connect(s, sockin, sockaddr_size) = 0 Then
            If s > 0 Then
                dummy = closesocket(s)
            End If
            ConnectSock = INVALID_SOCKET
            Exit Function
        End If
        If HWndToMsg <> 0 Then
            SelectOps = FD_READ Or FD_WRITE Or FD_CONNECT Or FD_CLOSE
            If WSAAsyncSelect(s, HWndToMsg, ByVal 1025, ByVal SelectOps) Then
                If s > 0 Then
                    dummy = closesocket(s)
                End If
                ConnectSock = INVALID_SOCKET
                Exit Function
            End If
        End If
    Else
        SelectOps = FD_READ Or FD_WRITE Or FD_CONNECT Or FD_CLOSE
        If WSAAsyncSelect(s, HWndToMsg, ByVal 1025, ByVal SelectOps) Then
            If s > 0 Then
                dummy = closesocket(s)
            End If
            ConnectSock = INVALID_SOCKET
            Exit Function
        End If
        If connect(s, sockin, sockaddr_size) <> -1 Then
            If s > 0 Then
                dummy = closesocket(s)
            End If
            ConnectSock = INVALID_SOCKET
            Exit Function
        End If
    End If
    ConnectSock = s
End Function

Public Function SetSockLinger(ByVal SockNum&, ByVal OnOff%, ByVal LingerTime%) As Long
    Dim Linger As LingerType
    Linger.l_onoff = OnOff
    Linger.l_linger = LingerTime
    If setsockopt(SockNum, SOL_SOCKET, SO_LINGER, Linger, 4) Then
        Debug.Print "Error setting linger info: " & WSAGetLastError()
        SetSockLinger = SOCKET_ERROR
    Else
        If getsockopt(SockNum, SOL_SOCKET, SO_LINGER, Linger, 4) Then
            Debug.Print "Error getting linger info: " & WSAGetLastError()
            SetSockLinger = SOCKET_ERROR
        Else
            Debug.Print "Linger is on if nonzero: "; Linger.l_onoff
            Debug.Print "Linger time if linger is on: "; Linger.l_linger
        End If
    End If
End Function

Sub EndWinsock()
    Dim ret&
    If WSAIsBlocking() Then
        ret = WSACancelBlockingCall()
    End If
    ret = WSACleanup()
    WSAStartedUp = False
End Sub

Public Function GetAscIP(ByVal inn As Long) As String
    Dim nStr&
    Dim lpStr&
    Dim retString$
    retString = String(32, 0)
    lpStr = inet_ntoa(inn)