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device-common.c

/*
 *   $Id: device-common.c,v 1.8 2006/05/23 06:49:37 psavola Exp $
 *
 *   Authors:
 *    Lars Fenneberg          <lf@elemental.net>       
 *
 *   This software is Copyright 1996,1997 by the above mentioned author(s), 
 *   All Rights Reserved.
 *
 *   The license which is distributed with this software in the file COPYRIGHT
 *   applies to this software. If your distribution is missing this file, you
 *   may request it from <pekkas@netcore.fi>.
 *
 */

#include <config.h>
#include <includes.h>
#include <radvd.h>
#include <defaults.h>

int
check_device(int sock, struct Interface *iface)
{
      struct ifreq      ifr;
      
      strncpy(ifr.ifr_name, iface->Name, IFNAMSIZ-1);
      ifr.ifr_name[IFNAMSIZ-1] = '\0';

      if (ioctl(sock, SIOCGIFFLAGS, &ifr) < 0)
      {
            if (!iface->IgnoreIfMissing)
                  flog(LOG_ERR, "ioctl(SIOCGIFFLAGS) failed for %s: %s", 
                        iface->Name, strerror(errno));
            return (-1);
      }

      if (!(ifr.ifr_flags & IFF_UP))
      {
            if (!iface->IgnoreIfMissing)
                  flog(LOG_ERR, "interface %s is not UP", iface->Name);
            return (-1);
      }
      
      if (! iface->UnicastOnly && !(ifr.ifr_flags & IFF_MULTICAST))
      {
            flog(LOG_WARNING, "interface %s does not support multicast",
                  iface->Name);
            flog(LOG_WARNING, "   do you need to add the UnicastOnly flag?");
      }

      if (! iface->UnicastOnly && !(ifr.ifr_flags & IFF_BROADCAST))
      {
            flog(LOG_WARNING, "interface %s does not support broadcast",
                  iface->Name);
            flog(LOG_WARNING, "   do you need to add the UnicastOnly flag?");
      }

      return 0;
}

int
get_v4addr(const char *ifn, unsigned int *dst)
{
        struct ifreq    ifr;
        struct sockaddr_in *addr;
        int fd;

        if( ( fd = socket(AF_INET,SOCK_DGRAM,0) ) < 0 )
        {
                flog(LOG_ERR, "create socket for IPv4 ioctl failed for %s: %s",
                        ifn, strerror(errno));
                return (-1);
        }

        memset(&ifr, 0, sizeof(ifr));
        strncpy(ifr.ifr_name, ifn, IFNAMSIZ-1);
        ifr.ifr_name[IFNAMSIZ-1] = '\0';
        ifr.ifr_addr.sa_family = AF_INET;

        if (ioctl(fd, SIOCGIFADDR, &ifr) < 0)
        {
                flog(LOG_ERR, "ioctl(SIOCGIFADDR) failed for %s: %s",
                        ifn, strerror(errno));
                close( fd );
                return (-1);
        }

        addr = (struct sockaddr_in *)(&ifr.ifr_addr);

        dlog(LOG_DEBUG, 3, "IPv4 address for %s is %s", ifn,
                inet_ntoa( addr->sin_addr ) );

        *dst = addr->sin_addr.s_addr;

        close( fd );

        return 0;
}

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