OW_NwIface.cpp

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/*******************************************************************************
* Copyright (C) 2001-2004 Vintela, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
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*    this list of conditions and the following disclaimer.
*
*  - Redistributions in binary form must reproduce the above copyright notice,
*    this list of conditions and the following disclaimer in the documentation
*    and/or other materials provided with the distribution.
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*    contributors may be used to endorse or promote products derived from this
*    software without specific prior written permission.
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#include "OW_config.h"

#if !defined(OW_WIN32) && !defined(OW_NETWARE)

extern "C"
{
#ifdef OW_HAVE_UNISTD_H
  #include <unistd.h>
#endif

#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>

#ifdef OW_HAVE_SYS_SOCKET_H
  #include <sys/socket.h>
#endif

#include <arpa/inet.h>
#include <errno.h>

#ifdef OW_GNU_LINUX
  #include <sys/ioctl.h>
  #include <linux/if.h>
  #include <string.h>

#elif defined (OW_OPENSERVER)
  #include <string.h>
  #include <stropts.h>
  #include <net/if.h>
  #include <netinet/in.h>
  #include <strings.h>
  #include <arpa/inet.h>
  #include <fcntl.h>
  #include <paths.h>
  #include <sys/mdi.h>

#elif defined (OW_DARWIN)
  #include <net/if.h>
  #include <sys/ioctl.h>
#else

  #ifdef OW_HAVE_STROPTS_H
    #include <stropts.h>
  #endif

  #include <net/if.h>
  #include <netinet/in.h>

  #if defined (OW_HAVE_SYS_SOCKIO_H)
    #include <sys/sockio.h>
  #endif

  #include <strings.h>
  #include <fcntl.h>
#endif

#include <string.h>
} // extern "C"
// These need to be after the system includes because of some weird openserver
// include order problem
#include "OW_NwIface.hpp"
#include "OW_String.hpp"
#include "OW_Exception.hpp"
#include "OW_SocketUtils.hpp"

namespace OW_NAMESPACE
{

NwIface::NwIface()
{
   int s, lerrno;
   struct ifreq ifr;
   struct sockaddr_in *sin(0);
   if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
   {
      OW_THROW(SocketException, "socket");
   }
   getInterfaceName(s);
   bzero(&ifr, sizeof(ifr));
   strncpy(ifr.ifr_name, m_name.c_str(), sizeof(ifr.ifr_name));
   // Get IP address
   if (ioctl(s, SIOCGIFADDR, &ifr) < 0)
   {
      lerrno = errno;
      close(s);
      OW_THROW(SocketException, "ioctl:SIOCGIFADDR");
   }
   sin = reinterpret_cast<struct sockaddr_in *>(&ifr.ifr_addr);
   m_addr = sin->sin_addr.s_addr;
   // Get the broadcast address
   // Testing
   if (ioctl(s, SIOCGIFBRDADDR, &ifr) < 0)
   {
      lerrno = errno;
      close(s);
      OW_THROW(SocketException, "ioctl:SIOCGIFBRDADDR");
   }
   sin = reinterpret_cast<struct sockaddr_in*>(&ifr.ifr_broadaddr);
   m_bcastAddr = sin->sin_addr.s_addr;
   // Get net mask
   if (ioctl(s, SIOCGIFNETMASK, &ifr) < 0)
   {
      lerrno = errno;
      close(s);
      OW_THROW(SocketException, "ioctl:SIOCGIFNETMASK");
   }
#ifdef OW_GNU_LINUX
   sin = reinterpret_cast<struct sockaddr_in *>(&ifr.ifr_netmask);
#else
   sin = reinterpret_cast<struct sockaddr_in *>(&ifr.ifr_broadaddr);
#endif
   m_netmask = sin->sin_addr.s_addr;
   close(s);
}
String
NwIface::getName()
{
   return m_name;
}
unsigned long
NwIface::getIPAddress()
{
   return m_addr;
}
String
NwIface::getIPAddressString()
{
   return SocketUtils::inetAddrToString(m_addr);
}
unsigned long
NwIface::getBroadcastAddress()
{
   return m_bcastAddr;
}
String
NwIface::getBroadcastAddressString()
{
   return SocketUtils::inetAddrToString(m_bcastAddr);
}
/*
String
NwIface::getMACAddressString()
{
   return m_macAddress;
}
*/
unsigned long
NwIface::getNetmask()
{
   return m_netmask;
}
String
NwIface::getNetmaskString()
{
   return SocketUtils::inetAddrToString(m_netmask);
}
bool
NwIface::sameNetwork(unsigned long addr)
{
   return ((addr & m_netmask) == (m_addr & m_netmask));
}
bool
NwIface::sameNetwork(const String& straddr)
{
   return sameNetwork(stringToAddress(straddr));
}
unsigned long
NwIface::stringToAddress(const String& straddr)
{
   return inet_addr(straddr.c_str());
}
void
NwIface::getInterfaceName(SocketHandle_t sockfd)
{
   char *p(0);
   int numreqs = 30;
   struct ifconf ifc;
   struct ifreq *ifr(0);
   struct ifreq ifrcopy;
   int n;
   int oldlen = -1;
   int lerrno = 0;
   const char* appliesTo(0);
   ifc.ifc_buf = NULL;
   for (;;)
   {
      ifc.ifc_len = sizeof(struct ifreq) * numreqs;
      if (ifc.ifc_buf == NULL)
      {
         ifc.ifc_buf = new char[ifc.ifc_len];
      }
      else
      {
         p = new char[ifc.ifc_len];
         memmove(p, ifc.ifc_buf, oldlen);
         delete [] ifc.ifc_buf;
         ifc.ifc_buf = p;
      }
      oldlen = ifc.ifc_len;
      if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0)
      {
         lerrno = errno;
         appliesTo = "ioctl:SIOCGIFCONF";
         break;
      }
      if (ifc.ifc_len == static_cast<int>(sizeof(struct ifreq) * numreqs))
      {
         /* assume it overflowed and try again */
         numreqs += 10;
         continue;
      }
      break;
   }
   if (lerrno == 0)
   {
      lerrno = ENODEV;
      appliesTo = "No interfaces found";
      ifr = ifc.ifc_req;
      for (n = 0; n < ifc.ifc_len; n += sizeof(struct ifreq))
      {
         ifrcopy = *ifr;
         if (ioctl(sockfd, SIOCGIFFLAGS, &ifrcopy) < 0)
         {
            lerrno = errno;
            appliesTo = "ioctl:SIOCGIFFLAGS";
            break;
         }
#ifdef OW_GNU_LINUX
         if ((ifrcopy.ifr_flags & IFF_UP) && !(ifrcopy.ifr_flags & (IFF_LOOPBACK | IFF_DYNAMIC)))
#else
         if ((ifrcopy.ifr_flags & IFF_UP))
#endif
         {
            m_name = ifr->ifr_name;
            lerrno = 0;
            break;
         }
         ifr++;
      }
   }
   if (ifc.ifc_buf != NULL)
   {
      delete [] ifc.ifc_buf;
   }
   if (lerrno != 0)
   {
      OW_THROW(SocketException, "NwIface::getInterfaceName");
   }
}

} // end namespace OW_NAMESPACE

#endif   // #if !defined(OW_WIN32) && !defined(OW_NETWARE)

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