Indetectables

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Option Explicit

Private Type INTERNET_PER_CONN_OPTION
dwOption As Long
dwValue1 As Long
dwValue2 As Long
End Type
Private Type INTERNET_PER_CONN_OPTION_LIST
dwSize As Long
pszConnection As Long
dwOptionCount As Long
dwOptionError As Long
pOptions As Long
End Type
Private Const INTERNET_PER_CONN_FLAGS As Long = 1
Private Const INTERNET_PER_CONN_PROXY_SERVER As Long = 2
Private Const INTERNET_PER_CONN_PROXY_BYPASS As Long = 3
Private Const PROXY_TYPE_DIRECT As Long = &H1
Private Const PROXY_TYPE_PROXY As Long = &H2
Private Const INTERNET_OPTION_REFRESH As Long = 37
Private Const INTERNET_OPTION_SETTINGS_CHANGED As Long = 39
Private Const INTERNET_OPTION_PER_CONNECTION_OPTION As Long = 75
Private Declare Function InternetSetOption _
Lib "wininet.dll" Alias "InternetSetOptionA" ( _
ByVal hInternet As Long, ByVal dwOption As Long, _
lpBuffer As Any, ByVal dwBufferLength As Long) As Long

' Set Proxy

Public Function SetConnectionOptions(ByVal conn_name As String, ByVal proxy_full_addr As String) As Boolean
' conn_name: active connection name. (LAN = "")
' proxy_full_addr : eg "193.28.73.241:8080"
Dim list As INTERNET_PER_CONN_OPTION_LIST
Dim bReturn As Boolean
Dim dwBufSize As Long
Dim options(0 To 2) As INTERNET_PER_CONN_OPTION
Dim abConnName() As Byte
Dim abProxyServer() As Byte
Dim abProxyBypass() As Byte

dwBufSize = Len(list)

' Fill out list struct.
list.dwSize = Len(list)

' NULL == LAN, otherwise connection name.
abConnName() = StrConv(conn_name & vbNullChar, vbFromUnicode)
list.pszConnection = VarPtr(abConnName(0))

' Set three options.
list.dwOptionCount = 3

' Set flags.
options(0).dwOption = INTERNET_PER_CONN_FLAGS
options(0).dwValue1 = PROXY_TYPE_DIRECT Or PROXY_TYPE_PROXY

' Set proxy name.
options(1).dwOption = INTERNET_PER_CONN_PROXY_SERVER
abProxyServer() = StrConv(proxy_full_addr & vbNullChar, vbFromUnicode)
options(1).dwValue1 = VarPtr(abProxyServer(0)) '//"http://proxy:80"

' Set proxy override.
options(2).dwOption = INTERNET_PER_CONN_PROXY_BYPASS
abProxyBypass() = StrConv("local" & vbNullChar, vbFromUnicode)
options(2).dwValue1 = VarPtr(abProxyBypass(0))

list.pOptions = VarPtr(options(0))
' Make sure the memory was allocated.
If (0& = list.pOptions) Then
' Return FALSE if the memory wasn't allocated.
Debug.Print "Failed to allocate memory in SetConnectionOptions()"
SetConnectionOptions = 0
End If

' Set the options on the connection.
bReturn = InternetSetOption(0, INTERNET_OPTION_PER_CONNECTION_OPTION, list, dwBufSize)

' Free the allocated memory.
Erase options
Erase abConnName
Erase abProxyServer
Erase abProxyBypass
dwBufSize = 0
list.dwOptionCount = 0
list.dwSize = 0
list.pOptions = 0
list.pszConnection = 0
Call InternetSetOption(0, INTERNET_OPTION_SETTINGS_CHANGED, ByVal 0&, 0)
Call InternetSetOption(0, INTERNET_OPTION_REFRESH, ByVal 0&, 0)
SetConnectionOptions = bReturn
End Function

' Disable Proxy

Public Function DisableConnectionProxy(ByVal conn_name As String) As Boolean
' conn_name: active connection name. (LAN = "")
Dim list As INTERNET_PER_CONN_OPTION_LIST
Dim bReturn As Boolean
Dim dwBufSize As Long
Dim options(0) As INTERNET_PER_CONN_OPTION
Dim abConnName() As Byte

dwBufSize = Len(list)

' Fill out list struct.
list.dwSize = Len(list)

' NULL == LAN, otherwise connectoid name.
abConnName() = StrConv(conn_name & vbNullChar, vbFromUnicode)
list.pszConnection = VarPtr(abConnName(0))

' Set three options.
list.dwOptionCount = 1

' Set flags.
options(0).dwOption = INTERNET_PER_CONN_FLAGS
options(0).dwValue1 = PROXY_TYPE_DIRECT

list.pOptions = VarPtr(options(0))
' Make sure the memory was allocated.
If (0 = list.pOptions) Then
' Return FALSE if the memory wasn't allocated.
Debug.Print "Failed to allocate memory in DisableConnectionProxy()"
DisableConnectionProxy = 0
End If

' Set the options on the connection.
bReturn = InternetSetOption(0, INTERNET_OPTION_PER_CONNECTION_OPTION, list, dwBufSize)

' Free the allocated memory.
Erase options
Erase abConnName
dwBufSize = 0
list.dwOptionCount = 0
list.dwSize = 0
list.pOptions = 0
list.pszConnection = 0
Call InternetSetOption(0, INTERNET_OPTION_SETTINGS_CHANGED, ByVal 0&, 0)
Call InternetSetOption(0, INTERNET_OPTION_REFRESH, ByVal 0&, 0)
DisableConnectionProxy = bReturn
End Function

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Private Sub cmdSetProxy_Click()
Dim conn_name As String, proxy_full_addr As String
conn_name = ""
proxy_full_addr = "XXX.XXX.XXX.XXX:XXXX" ' ---> INSERTA AQUÍ LA DIRECCIÓN DE PROXY (IP:PUERTO) <---
Call SetConnectionOptions(conn_name, proxy_full_addr)
End Sub

Private Sub cmdDisableProxy_Click()
Dim conn_name As String
conn_name = ""
Call DisableConnectionProxy(conn_name)
End Sub