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//
// From MSDN. License as per MSDN docs.
//
// NOTE: When building, link explicitly with the following libraries:
// wininet.lib
// ws2_32.lib
// urlmon.lib
//
// Note: This requires an up to date SDK - the one that ships with VC.NET is a little too old since
// these APIs were only made public recently even though they existed in Win95.
//
// FIXME: Could probably work around this with a cut/paste of the relevant bits
#define WIN32_LEAN_AND_MEAN 1
#include <windows.h>
#include "wininet.h"
#include <urlmon.h>
#include <stdio.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#include "../cvs_string.h"
/* ==================================================================
HELPER FUNCTIONS
================================================================== */
/////////////////////////////////////////////////////////////////////
// ResolveHostName (a helper function)
/////////////////////////////////////////////////////////////////////
DWORD __stdcall ResolveHostName( LPSTR lpszHostName,
LPSTR lpszIPAddress,
LPDWORD lpdwIPAddressSize )
{
DWORD dwIPAddressSize;
addrinfo Hints;
LPADDRINFO lpAddrInfo;
LPADDRINFO IPv4Only;
DWORD error;
// Figure out first whether to resolve a name or an address literal.
// If getaddrinfo( ) with the AI_NUMERICHOST flag succeeds, then
// lpszHostName points to a string representation of an IPv4 or IPv6
// address. Otherwise, getaddrinfo( ) should return EAI_NONAME.
ZeroMemory( &Hints, sizeof(addrinfo) );
Hints.ai_flags = AI_NUMERICHOST; // Only check for address literals.
Hints.ai_family = PF_UNSPEC; // Accept any protocol family.
Hints.ai_socktype = SOCK_STREAM; // Constrain results to stream socket.
Hints.ai_protocol = IPPROTO_TCP; // Constrain results to TCP.
error = getaddrinfo( lpszHostName, NULL, &Hints, &lpAddrInfo );
if( error != EAI_NONAME )
{
if( error != 0 )
{
error = ( error == EAI_MEMORY ) ?
ERROR_NOT_ENOUGH_MEMORY : ERROR_INTERNET_NAME_NOT_RESOLVED;
goto quit;
}
freeaddrinfo( lpAddrInfo );
// An IP address (either v4 or v6) was passed in, so if there is
// room in the lpszIPAddress buffer, copy it back out and return.
dwIPAddressSize = lstrlenA( lpszHostName );
if( ( *lpdwIPAddressSize < dwIPAddressSize ) ||
( lpszIPAddress == NULL ) )
{
*lpdwIPAddressSize = dwIPAddressSize + 1;
error = ERROR_INSUFFICIENT_BUFFER;
goto quit;
}
lstrcpyA( lpszIPAddress, lpszHostName );
goto quit;
}
// Call getaddrinfo( ) again, this time with no flag set.
Hints.ai_flags = 0;
error = getaddrinfo( lpszHostName, NULL, &Hints, &lpAddrInfo );
if( error != 0 )
{
error = ( error == EAI_MEMORY ) ?
ERROR_NOT_ENOUGH_MEMORY : ERROR_INTERNET_NAME_NOT_RESOLVED;
goto quit;
}
// Convert the IP address in addrinfo into a string.
// (the following code only handles IPv4 addresses)
IPv4Only = lpAddrInfo;
while( IPv4Only->ai_family != AF_INET )
{
IPv4Only = IPv4Only->ai_next;
if( IPv4Only == NULL )
{
error = ERROR_INTERNET_NAME_NOT_RESOLVED;
goto quit;
}
}
error = getnameinfo( IPv4Only->ai_addr, (socklen_t)IPv4Only->ai_addrlen, lpszIPAddress,
*lpdwIPAddressSize, NULL, 0, NI_NUMERICHOST );
if( error != 0 )
error = ERROR_INTERNET_NAME_NOT_RESOLVED;
quit:
return( error );
}
/////////////////////////////////////////////////////////////////////
// IsResolvable (a helper function)
/////////////////////////////////////////////////////////////////////
BOOL __stdcall IsResolvable( LPSTR lpszHost )
{
char szDummy[255];
DWORD dwDummySize = sizeof(szDummy) - 1;
if( ResolveHostName( lpszHost, szDummy, &dwDummySize ) )
return( FALSE );
return TRUE;
}
/////////////////////////////////////////////////////////////////////
// GetIPAddress (a helper function)
/////////////////////////////////////////////////////////////////////
DWORD __stdcall GetIPAddress( LPSTR lpszIPAddress,
LPDWORD lpdwIPAddressSize )
{
char szHostBuffer[255];
if( gethostname( szHostBuffer, sizeof(szHostBuffer) - 1 ) != ERROR_SUCCESS )
return( ERROR_INTERNET_INTERNAL_ERROR );
return( ResolveHostName( szHostBuffer, lpszIPAddress, lpdwIPAddressSize ) );
}
/////////////////////////////////////////////////////////////////////
// IsInNet (a helper function)
/////////////////////////////////////////////////////////////////////
BOOL __stdcall IsInNet( LPSTR lpszIPAddress, LPSTR lpszDest, LPSTR lpszMask )
{
DWORD dwDest;
DWORD dwIpAddr;
DWORD dwMask;
dwIpAddr = inet_addr( lpszIPAddress );
dwDest = inet_addr( lpszDest );
dwMask = inet_addr( lpszMask );
if( ( dwDest == INADDR_NONE ) ||
( dwIpAddr == INADDR_NONE ) ||
( ( dwIpAddr & dwMask ) != dwDest ) )
return( FALSE );
return( TRUE );
}
bool GetProxyForHost(const char *url, const char *hostname, cvs::string& proxy, cvs::string& proxy_port)
{
static bool bInitialised = false, bWorking = false;
char WPADLocation[1024]= "";
char TempPath[MAX_PATH];
char TempFile[MAX_PATH];
DWORD dwProxyHostNameLength;
DWORD returnVal;
HMODULE hModJS;
// Declare and populate an AutoProxyHelperVtbl structure, and then
// place a pointer to it in a containing AutoProxyHelperFunctions
// structure, which will be passed to InternetInitializeAutoProxyDll:
// Failure to compile this line means you have an out of date platfrom SDK.
static const AutoProxyHelperVtbl Vtbl =
{
IsResolvable,
GetIPAddress,
ResolveHostName,
IsInNet
};
static const AutoProxyHelperFunctions HelperFunctions = { &Vtbl };
// Declare function pointers for the three autoproxy functions
static pfnInternetInitializeAutoProxyDll pInternetInitializeAutoProxyDll;
static pfnInternetDeInitializeAutoProxyDll pInternetDeInitializeAutoProxyDll;
static pfnInternetGetProxyInfo pInternetGetProxyInfo;
static cvs::string static_proxy,static_port;
if(!bInitialised)
{
bInitialised=true;
bWorking=false;
if( !( hModJS = LoadLibraryA( "jsproxy.dll" ) ) )
return false;
if( !( pInternetInitializeAutoProxyDll = (pfnInternetInitializeAutoProxyDll)
GetProcAddress( hModJS, "InternetInitializeAutoProxyDll" ) ) ||
!( pInternetDeInitializeAutoProxyDll = (pfnInternetDeInitializeAutoProxyDll)
GetProcAddress( hModJS, "InternetDeInitializeAutoProxyDll" ) ) ||
!( pInternetGetProxyInfo = (pfnInternetGetProxyInfo)
GetProcAddress( hModJS, "InternetGetProxyInfo" ) ) )
return false;
INTERNET_PER_CONN_OPTIONA pco[] =
{
{ INTERNET_PER_CONN_FLAGS },
{ INTERNET_PER_CONN_AUTOCONFIG_URL },
{ INTERNET_PER_CONN_PROXY_SERVER },
{ INTERNET_PER_CONN_PROXY_BYPASS },
{ INTERNET_PER_CONN_AUTOCONFIG_SECONDARY_URL }
};
INTERNET_PER_CONN_OPTION_LISTA pcol = { sizeof(pco), NULL, sizeof(pco)/sizeof(pco[0]), 0, pco };
DWORD dwLen=sizeof(pcol);
if(!InternetQueryOptionA(NULL,INTERNET_OPTION_PER_CONNECTION_OPTION,&pcol,&dwLen))
return false;
DWORD pt = pco[0].Value.dwValue;
if(pt&PROXY_TYPE_AUTO_DETECT)
{
// Autodetect proxy file. We only want to do this once becuase it's slow
// We do DNS first... DHCP can take up to 10 seconds to complete.
if(!DetectAutoProxyUrl( WPADLocation, sizeof(WPADLocation),PROXY_AUTO_DETECT_TYPE_DNS_A) &&
!DetectAutoProxyUrl( WPADLocation, sizeof(WPADLocation), PROXY_AUTO_DETECT_TYPE_DHCP ))
return false;
}
else if(pt&PROXY_TYPE_AUTO_PROXY_URL)
{
// Download proxy.pac from url
strncpy(WPADLocation,pco[1].Value.pszValue,sizeof(WPADLocation));
LocalFree((HLOCAL)pco[1].Value.pszValue);
}
else if(pt&PROXY_TYPE_PROXY)
{
// Explicitly set proxy server
LPSTR szValue = pco[2].Value.pszValue;
static_port="";
char *p=strrchr(szValue,':');
if(p)
{
*p='\0';
static_port=p+1;
}
static_proxy=szValue;
LocalFree((HLOCAL)szValue);
}
else
{
return false; // Fail the detect, forcing us to go direct
}
if(!static_proxy.length())
{
GetTempPathA( sizeof(TempPath)/sizeof(TempPath[0]), TempPath );
GetTempFileNameA( TempPath, NULL, 0, TempFile );
URLDownloadToFileA( NULL, WPADLocation, TempFile, NULL, NULL );
if( !( returnVal = pInternetInitializeAutoProxyDll( 0, TempFile, NULL,
(AutoProxyHelperFunctions*)&HelperFunctions, NULL ) ) )
return false;
// Delete the temporary file
DeleteFileA( TempFile );
}
bWorking = true;
}
if(!bWorking)
return false;
if(static_proxy.length())
{
proxy = static_proxy;
proxy_port = static_port;
}
else
{
dwProxyHostNameLength=0;
LPSTR szProxy = NULL;
if( !pInternetGetProxyInfo( (LPSTR) url, (DWORD)strlen(url),
(LPSTR) hostname, (DWORD)strlen(hostname),
&szProxy, &dwProxyHostNameLength ) )
return false;
if(!szProxy || !strcmp(szProxy,"DIRECT"))
return false; // Direct connection
if(strncmp(szProxy,"PROXY ",6))
return false; // This should be the only possible string (maybe "SOCKS" but that's little used)
proxy_port="";
char *p = strrchr(szProxy,':');
if(p)
{
proxy_port=p+1;
*p='\0';
}
proxy=szProxy+6;
// Not documented - how to free this?
LocalFree((HLOCAL)szProxy);
}
return true;
}
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