Local System 权限读取用户IE 代理设置的研究及简单HTTP代理验证

#include "windows.h"
#include "stdio.h"
#include "string.h"
//#include "winsock2.h"
//#include "wininet.h"

#pragma comment (lib,"ws2_32")

void LogToFile(char *LogText);

//有ProxyServer键值就取回来返回true，否则返回false;
bool CheckProxySetting(char * subkey,struct ProxyData * pCurrent);

//check proxyserver connection status
bool CheckProxyConnection(struct ProxyData * head);

//test http conn to either the proxy server or ditect the web server.
bool CheckHTTPconnction(char *hostname,int port,char * req,char * key);

//check intranet connection status
bool CheckIntranetConn();

struct ProxyData
{
char pServer[128];
int  pPort;
ProxyData * pdNext;
};

void main()
{
/*
//使用wininet函数在system权限下是没有办法获得正确的结果的，另外，还存在另外一种情况，
//就是没有勾选"使用代理服务器访问网络"的时候Internet Setting子键里面一样有Proxy Server的值，
//这种情况存在的概率是相当大的，因为很多用户并不会用bypass设置来同时访问内外网，要访问内网就
//关掉上面的勾选。读取注册表键理论上可以有效减少漏报。

//同样要解决system权限下current_user键没有办法使用的问题，测试的时候使用psu在system权限下看到
//current_user里面的确没有信息，但是在HEKY_USERS/S-1-5-21-1935655697-725345543-839522115-500/
//下面却有相应的信息。回到administrators权限下还是/S-1-5-21-1935655697-725345543-839522115-500/
//有了下面枚举子键的想法。尝试中。

INTERNET_PROXY_INFO *pIEinfo = NULL;
DWORD dwSize = 0;
BOOL bRet = InternetQueryOption(NULL, INTERNET_OPTION_PROXY, pIEinfo, &dwSize);
pIEinfo = (INTERNET_PROXY_INFO*)new char[dwSize];
bRet = InternetQueryOption(NULL, INTERNET_OPTION_PROXY, pIEinfo, &dwSize);
LogToFile((char *)(pIEinfo+1));
printf("/nResult:%s",pIEinfo+1);
*/

int  index=0;
char keyBuff[256]={0};
DWORD dwSize=sizeof(keyBuff);
struct ProxyData *p,*q,*head;
char *got=NULL;
bool succ=false;

head=NULL;
p=NULL;
q=NULL;

while(RegEnumKeyEx(HKEY_USERS,index,keyBuff,&dwSize,NULL,NULL,NULL,NULL)!=ERROR_NO_MORE_ITEMS)
{
  printf("/nSubkey: %s",keyBuff);
  //LogToFile(keyBuff);

  //handle the result we have got
  if((strstr(keyBuff,"DEFAULT")==NULL)&&(strstr(keyBuff,"Classes")==NULL)) //we can only find right result in de key like xxxxx-xxx,experience from my test.
  {
   q=(struct ProxyData *)GlobalAlloc(GMEM_ZEROINIT,sizeof(struct ProxyData));
   if(q == NULL)
   {
    printf("/nAllocate memory error!");
    return;
   }
   q->pdNext=NULL;

   if(CheckProxySetting(keyBuff,q))//once we got a result,the answer is success.
   {
    if(head!=NULL)
    {
     p->