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Sourcecode: netcfg version File versions

ethtool-lite.c

/* The best bits of mii-diag and ethtool mixed into one big jelly roll. */

#include <stdio.h>
#include <string.h>
#include <net/if.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#ifndef TEST
# include <debian-installer/log.h>
# define CONNECTED 1
# define DISCONNECTED 2
# define UNKNOWN 3
#else
# define di_info(fmt, ...) printf(fmt, ## __VA_ARGS__)
# define di_warning(fmt, ...) fprintf(stderr, fmt, ## __VA_ARGS__)
# define CONNECTED 0
# define DISCONNECTED 0
# define UNKNOWN 1
#endif

#ifndef ETHTOOL_GLINK
# define ETHTOOL_GLINK 0x0000000a
#endif

#ifndef SIOCETHTOOL
# define SIOCETHTOOL 0x8946
#endif

struct ethtool_value
{
      u_int32_t cmd;
      u_int32_t data;
};

#ifdef TEST
int main(int argc, char** argv)
#else
int ethtool_lite (char * iface)
#endif
{
      struct ethtool_value edata;
      struct ifreq ifr;
#ifdef TEST
      char* iface;
#endif
      int fd = socket(AF_INET, SOCK_DGRAM, 0);

      memset (&edata, 0, sizeof(struct ethtool_value));
      
      if (fd < 0)
      {
            di_warning("could not open control socket\n");
            return UNKNOWN;
      }

#ifdef TEST
      if (argc < 2)
      {
            fprintf(stderr, "Error: must pass an interface name\n");
            return 1;
      }
      iface = argv[1];
#endif
      
      edata.cmd = ETHTOOL_GLINK;
      ifr.ifr_data = (char *)&edata;
      strncpy (ifr.ifr_name, iface, IFNAMSIZ);
      
      if (ioctl (fd, SIOCETHTOOL, &ifr) < 0)
            di_info("ethtool ioctl on %s failed\n", iface);
      
      if (edata.data)
      {
            di_info("%s is connected.\n", iface);
            return CONNECTED;
      }
      else
      {
            u_int16_t *data = (u_int16_t *)&ifr.ifr_data;
            int ctl;
            data[0] = 0;

            if (ioctl (fd, 0x8947, &ifr) >= 0)
                  ctl = 0x8948;
            else if (ioctl (fd, SIOCDEVPRIVATE, &ifr) >= 0)
                  ctl = SIOCDEVPRIVATE + 1;
            else
            {
                  di_warning("couldn't determine MII ioctl to use for %s\n", iface);
                  return UNKNOWN;
            }

            data[1] = 1;

            if (ioctl (fd, ctl, &ifr) >= 0)
            {
                  int ret = !(data[3] & 0x0004);

                  di_info ("%s is %sconnected. (MII)\n", iface,
                        (ret) ? "dis" : "");

                  return ret ? DISCONNECTED : CONNECTED;
            }
      }

      di_warning("MII ioctl failed for %s\n", iface);
      return UNKNOWN;
}

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