release/src/router/openvpn/ieproxy.c

   1 /*
   2  *  Copyright (C) 2004 Ewan Bhamrah Harley <code@ewan.info>
   3  *
   4  *  This program is free software; you can redistribute it and/or modify
   5  *  it under the terms of the GNU General Public License as published by
   6  *  the Free Software Foundation; either version 2 of the License, or
   7  *  (at your option) any later version.
   8  *
   9  *  This program is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *  GNU General Public License for more details.
  13  *
  14  *  You should have received a copy of the GNU General Public License
  15  *  along with this program (see the file COPYING included with this
  16  *  distribution); if not, write to the Free Software Foundation, Inc.,
  17  *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19
  20 #include "syshead.h"
  21
  22 #ifdef WIN32
  23
  24 #include <wininet.h>
  25 #include <malloc.h>
  26
  27 LPCTSTR getIeHttpProxyError=NULL;
  28
  29 /* getIeHttpProxy fetches the current IE proxy settings for http */
  30
  31 LPCTSTR getIeHttpProxy()
  32 {
  33   DWORD psize=0;
  34   INTERNET_PROXY_INFO *pinfo;
  35   LPTSTR proxyString;
  36   LPTSTR p;
  37   LPTSTR q;
  38   unsigned int len;
  39
  40   /* first see how big a buffer we need for the IPO structure */
  41   InternetQueryOption(NULL, INTERNET_OPTION_PROXY, NULL, &psize);
  42   if(!psize)
  43   {
  44     getIeHttpProxyError="InternetQueryOption failed to return buffer size";
  45     return(NULL);
  46   }
  47
  48   /* allocate memory for IPO */
  49   pinfo =  malloc (psize*sizeof(TCHAR));
  50   if (pinfo == NULL)
  51   {
  52     getIeHttpProxyError="malloc failed (1)";
  53     return(NULL);
  54   }
  55
  56   /* now run the real query */
  57   if(!InternetQueryOption(NULL, INTERNET_OPTION_PROXY, (LPVOID) pinfo, &psize))
  58   {
  59     getIeHttpProxyError="InternetQueryOption() failed to find proxy info";
  60     free(pinfo);
  61     return(NULL);
  62   }
  63
  64
  65   /* see what sort of result we got */
  66
  67   if(pinfo->dwAccessType == INTERNET_OPEN_TYPE_DIRECT)
  68   {
  69     /* No proxy configured */
  70     free(pinfo);
  71     return("");
  72   }
  73   else if(pinfo->dwAccessType == INTERNET_OPEN_TYPE_PROXY)
  74   {
  75     /* we have a proxy - now parse result string */
  76     /* if result string does NOT contain an '=' sign then */
  77     /* there is a single proxy for all protocols          */
  78     for (p=(LPTSTR)pinfo->lpszProxy; *p && *p != '='; p++);
  79     if(!*p)
  80     {
  81       /* single proxy */
  82       /* allocate a new string to return */
  83       len = 1+strlen(pinfo->lpszProxy);
  84       proxyString = malloc (len*sizeof(TCHAR));
  85       if (proxyString == NULL)
  86       {
  87         getIeHttpProxyError="malloc failed (2)";
  88         free(pinfo);
  89         return(NULL);
  90       }
  91       strncpy(proxyString, pinfo->lpszProxy,len);
  92       proxyString[len]=0;
  93       free(pinfo);
  94       return(proxyString);
  95     }
  96     else
  97     {
  98       /* multiple space seperated proxies defined in the form */
  99       /* protocol=proxyhost[:port]                            */
 100       /* we want the one marked "http=", if any.              */
 101       p=(LPTSTR)pinfo->lpszProxy;
 102       while(*p && strncmp(p, "http=", 5))
 103       {
 104         for(; *p && *p != ' '; p++);
 105         if(*p) p++;
 106       }
 107       if(*p)
 108       {
 109         /* found the proxy */
 110         p+=5;
 111         for(q=p; *q && *q != ' '; q++);
 112         /* allocate a buffer for the proxy information */
 113         len=1+(q-p);
 114         proxyString=malloc(len*sizeof(TCHAR));
 115         if(proxyString==NULL)
 116         {
 117           getIeHttpProxyError="malloc failed (3)";
 118           free(pinfo);
 119           return(NULL);
 120         }
 121         strncpy(proxyString, p, len);
 122         proxyString[len]=0;
 123         free(pinfo);
 124         return(proxyString);
 125       }
 126       else
 127       {
 128         /* No http proxy in list */
 129         free(pinfo);
 130         return("");
 131       }
 132     }
 133   }
 134   else
 135   {
 136     /* InternetQueryOption returned a proxy type we don't know about*/
 137     getIeHttpProxyError="Unknown Proxy Type";
 138     free(pinfo);
 139     return(NULL);
 140   }
 141 }
 142
 143 #else
 144 static void dummy (void) {}
 145 #endif                          /* WIN32 */