VC动态添加路由

  背景： 需求源于为ST测试人员所要实现的一个自动化工具，从PPPOE拨号到自动添加路由，最后到发包。

 

  相关知识：

（1）添加路由的主要函数：CreateIpForwardEntry

MSDN的描述如下：

The CreateIpForwardEntry function creates a route in the local computer's IPv4 routing table.

语法：

DWORD CreateIpForwardEntry(

  __in  PMIB_IPFORWARDROW pRoute

);

Parameters

pRoute [in]

A pointer to a MIB_IPFORWARDROW structure that specifies the information for the new route. The caller must specify values for all members of this structure. The caller must specify MIB_IPPROTO_NETMGMT for the dwForwardProto member of MIB_IPFORWARDROW .

Return Value

The function returns NO_ERROR (zero) if the function is successful.

更多消息查看：

http://msdn.microsoft.com/en-us/library/aa365860(VS.85).aspx

 

The MIB_IPFORWARDROW structure contains information that describes an IPv4 network route.

 

typedef struct
 _MIB_IPFORWARDROW {

  DWORD dwForwardDest;

  DWORD dwForwardMask;

  DWORD dwForwardPolicy;

  DWORD dwForwardNextHop;

  DWORD dwForwardIfIndex;

  DWORD dwForwardType;

  DWORD dwForwardProto;

  DWORD dwForwardAge;

  DWORD dwForwardNextHopAS;

  DWORD dwForwardMetric1;

  DWORD dwForwardMetric2;

  DWORD dwForwardMetric3;

  DWORD dwForwardMetric4;

  DWORD dwForwardMetric5;

} MIB_IPFORWARDROW, *PMIB_IPFORWARDROW;

更多信息查看 http://msdn.microsoft.com/en-us/library/aa366850(VS.85).aspx

 

 

具体实现代码 ：

DWORD AddRoutingTable(const char* pIP,const char* pMask,CString getway)

{

     MIB_IPFORWARDROW IpForwardTable={0};
     ZeroMemory(&IpForwardTable,sizeof(MIB_IPFORWARDROW));


    //const char *FWDESTADDR="219.138.39.150";
    //IpForwardTable.dwForwardDest=inet_addr(FWDESTADDR);
    //for test code

    IpForwardTable.dwForwardDest=inet_addr(pIP);

    //const char*FWMASK="255.255.255.255";
    //IpForwardTable.dwForwardMask=inet_addr(FWMASK);

 

    //需要注意的地方：如果子网掩码为255.255.255.255，则使用inet_addr会出现错误 。

    //由于本需求实现中子网掩码固定，所以直接写成了 0XFFFFFFFF，否则可以使用inet_aton进行转换
    IpForwardTable.dwForwardMask=0xFFFFFFFF;

    // IpForwardTable.dwForwardPolicy;
    // Unused value by CreateIpForwardEntry Function based on MSDN

    //const char *FWNEXTHOP="172.31.12.1";
    //IpForwardTable.dwForwardNextHop=inet_addr(FWNEXTHOP);
    // for test code

 

    IpForwardTable.dwForwardNextHop=inet_addr((LPTSTR)(LPCTSTR)getway);

     //IpForwardTable.dwForwardIfIndex=getindex("172.31.12.213");
    //for test
     //下面这个是一个比较重要的参数，当时为了这个参数纠结了很久 。需要通过定外一种方法获取。
    IpForwardTable.dwForwardIfIndex=getindex(pIP);

    //  IpForwardTable.dwForwardType;
   // Unused value by CreateIpForwardEntry Function based on MSDN
   
    IpForwardTable.dwForwardProto=MIB_IPPROTO_NETMGMT;
    //MIB_IPPROTO_NETMGMT indicates static appended

   // IpForwardTable.dwForwardAge;
   // Unused value by CreateIpForwardEntry Function based on MSDN
   // IpForwardTable.dwForwardNextHopAS;
   // Unused value by CreateIpForwardEntry Function based on MSDN
   
    IpForwardTable.dwForwardMetric1=1;
    //1 indicated highest prority

   // IpForwardTable.dwForwardMetric2;
   // Unused value by CreateIpForwardEntry Function based on MSDN
   // IpForwardTable.dwForwardMetric3;
   // Unused value by CreateIpForwardEntry Function based on MSDN
   // IpForwardTable.dwForwardMetric4;
   // Unused value by CreateIpForwardEntry Function based on MSDN
   // IpForwardTable.dwForwardMetric5;
   // Unused value by CreateIpForwardEntry Function based on MSDN


     DWORD dwRetVal;
    if(&IpForwardTable!=NULL)
    {
    dwRetVal = CreateIpForwardEntry(&IpForwardTable); 
    / /    dwRetVal = SetIpForwardEntry(&IpForwardTable);
    }
    if (dwRetVal == NO_ERROR)
    {
        //AfxMessageBox("Gateway changed successfully/n");
        printf("Gateway changed successfully/n"); 
    }
    else if (dwRetVal == ERROR_INVALID_PARAMETER)
    {
        AfxMessageBox("Invalid parameter./n");
    }
    else
    {
        AfxMessageBox("Error: %d/n", dwRetVal);
    }  

    return dwRetVal;
   
}

//获取index的具体方法： 其中dwForwardIfIndex 定义为 ：

dwForwardIfIndex

The index of the local interface through which the next hop of this route should be reached.
下面的函数要获取的就是这个值 。

ULONG getindex(const char *ip)
{

PIP_ADAPTER_INFO pinfo=NULL;
unsigned long len=0;
unsigned long nError;
nError=GetAdaptersInfo(pinfo,&len); //这里nError肯定是ERROR_BUFFER_OVERFLOW，但是　　　　　　　　　　　　　　　　　　//我们得到了要用多少长的字节来存它。
pinfo=(PIP_ADAPTER_INFO)malloc(len);
nError=GetAdaptersInfo(pinfo,&len);

//char *ip="172.31.12.213";
if(nError==0)
{  
    PIP_ADAPTER_INFO adapterPointer = pinfo;
    while(adapterPointer!=NULL)
    {
        PIP_ADDR_STRING ipAddressListPointer = &(adapterPointer->IpAddressList);
        while(ipAddressListPointer!=NULL){
            if(strcmp((char*)(ipAddressListPointer->IpAddress).String,ip)==0) {
                return(adapterPointer->Index);
            }else{
                ipAddressListPointer=ipAddressListPointer->Next;
            }
        adapterPointer = adapterPointer->Next;
        }   
    }
    //做相关的操作
}else
{
    if(nError==ERROR_NO_DATA) printf("请检查您的计算机是否安装了网卡");
    if(nError==ERROR_NOT_SUPPORTED) printf("请更新你的操作系统为Win98/Me/2000/XP/2003");
}
free( pinfo);
}