Routing.cpp
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00001 // -*- C++ -*-
00021 #include <winsock2.h>
00022 #include <ws2tcpip.h>
00023 #include <iphlpapi.h>
00024 
00025 #pragma comment(lib, "iphlpapi.lib")
00026 #pragma comment(lib, "ws2_32.lib")
00027 
00028 #include <coil/Routing.h>
00029 #include <coil/stringutil.h>
00030 #include <coil/config_coil.h>
00031 
00032 #define MALLOC(x) HeapAlloc(GetProcessHeap(), 0, (x))
00033 #define FREE(x) HeapFree(GetProcessHeap(), 0, (x))
00034 
00035 namespace coil
00036 {
00037   // Winsock initializer
00038   class Winsock
00039   {
00040   public:
00041     Winsock() {
00042       WSADATA wsaData;
00043       int iResult;
00044       iResult = WSAStartup(MAKEWORD(2, 2), &wsaData);
00045     }
00046     virtual ~Winsock()
00047     {
00048       WSACleanup();
00049     }
00050   };
00051 
00059   bool dest_to_endpoint(std::string dest_addr, std::string& endpoint)
00060   {
00061     Winsock winsock;
00062     {
00063       struct hostent* hp;
00064       hp = ::gethostbyname(dest_addr.c_str());
00065       if (hp == 0) { return false; }
00066 
00067       int i(0);
00068       while (hp->h_addr_list[i] != 0)
00069         {
00070           if(hp->h_addrtype == AF_INET)
00071             {
00072               struct sockaddr_in addr;
00073               memset((char*)&addr, 0, sizeof(addr));
00074               memcpy((char*)&addr.sin_addr, hp->h_addr_list[i], hp->h_length);
00075               dest_addr = inet_ntoa(addr.sin_addr);
00076               break;
00077             }
00078           ++i;
00079         }
00080     }
00081     
00082     UINT ipaddress(inet_addr(dest_addr.c_str()));
00083     if (ipaddress == INADDR_NONE) { return false; }
00084     
00085     DWORD bestifindex;
00086     if (NO_ERROR != GetBestInterface(ipaddress, &bestifindex)) { return false; }
00087         
00088     PMIB_IPADDRTABLE ipaddr_table;
00089     ipaddr_table = (MIB_IPADDRTABLE *) MALLOC(sizeof (MIB_IPADDRTABLE));
00090     if (ipaddr_table == 0) { return false; }
00091 
00092     // Make an initial call to GetIpAddrTable to get the
00093     // necessary size into the size variable
00094     DWORD size(0);
00095     if (GetIpAddrTable(ipaddr_table, &size, 0) == ERROR_INSUFFICIENT_BUFFER)
00096       {
00097         FREE(ipaddr_table);
00098         ipaddr_table = (MIB_IPADDRTABLE *) MALLOC(size);
00099       }
00100     if (ipaddr_table == 0) { return false; }
00101     if (GetIpAddrTable(ipaddr_table, &size, 0) != NO_ERROR) { return false; }
00102     
00103     for (int i(0); i < (int) ipaddr_table->dwNumEntries; ++i)
00104       {
00105         if (bestifindex == ipaddr_table->table[i].dwIndex)
00106           {
00107             IN_ADDR inipaddr;
00108             inipaddr.S_un.S_addr = (u_long) ipaddr_table->table[i].dwAddr;
00109             endpoint = inet_ntoa(inipaddr);
00110             return true;
00111           }
00112       }
00113     return false;
00114   }
00115   
00116   
00117 }; // namespace coil


openrtm_aist
Author(s): Noriaki Ando
autogenerated on Sun Mar 26 2017 03:37:17