iwevent.c

This package contains the Wireless tools, used to manipulate the Wireless Extensions. The Wireless

	char custom[IW_CUSTOM_MAX+1];
	memset(custom, '\0', sizeof(custom));
	if((event->u.data.pointer) && (event->u.data.length))
	  memcpy(custom, event->u.data.pointer, event->u.data.length);
	printf("Custom driver event:%s\n", custom);
      }
      break;
    case IWEVREGISTERED:
      printf("Registered node:%s\n",
	     iw_saether_ntop(&event->u.addr, buffer));
      break;
    case IWEVEXPIRED:
      printf("Expired node:%s\n",
	     iw_saether_ntop(&event->u.addr, buffer));
      break;
    case SIOCGIWTHRSPY:
      {
	struct iw_thrspy	threshold;
	if((event->u.data.pointer) && (event->u.data.length))
	  {
	    memcpy(&threshold, event->u.data.pointer,
		   sizeof(struct iw_thrspy));
	    printf("Spy threshold crossed on address:%s\n",
		   iw_saether_ntop(&threshold.addr, buffer));
	    iw_print_stats(buffer, sizeof(buffer),
			   &threshold.qual, iw_range, has_range);
	    printf("                            Link %s\n", buffer);
	  }
	else
	  printf("Invalid Spy Threshold event\n");
      }
      break;
      /* ----- driver WPA events ----- */
      /* Events generated by the driver, used for WPA operation */
    case IWEVMICHAELMICFAILURE:
      if(event->u.data.length >= sizeof(struct iw_michaelmicfailure))
	{
	  struct iw_michaelmicfailure mf;
	  memcpy(&mf, event->u.data.pointer, sizeof(mf));
	  printf("Michael MIC failure flags:0x%X src_addr:%s tsc:%s\n",
		 mf.flags,
		 iw_saether_ntop(&mf.src_addr, buffer2),
		 iw_hexdump(buffer, sizeof(buffer),
			    mf.tsc, IW_ENCODE_SEQ_MAX_SIZE));
	}
      break;
    case IWEVASSOCREQIE:
      printf("Association Request IEs:%s\n",
	     iw_hexdump(buffer, sizeof(buffer),
			event->u.data.pointer, event->u.data.length));
      break;
    case IWEVASSOCRESPIE:
      printf("Association Response IEs:%s\n",
	     iw_hexdump(buffer, sizeof(buffer),
			event->u.data.pointer, event->u.data.length));
      break;
    case IWEVPMKIDCAND:
      if(event->u.data.length >= sizeof(struct iw_pmkid_cand))
	{
	  struct iw_pmkid_cand cand;
	  memcpy(&cand, event->u.data.pointer, sizeof(cand));
	  printf("PMKID candidate flags:0x%X index:%d bssid:%s\n",
		 cand.flags, cand.index,
		 iw_saether_ntop(&cand.bssid, buffer));
	}
      break;
      /* ----- junk ----- */
      /* other junk not currently in use */
    case SIOCGIWRATE:
      iw_print_bitrate(buffer, sizeof(buffer), event->u.bitrate.value);
      printf("New Bit Rate:%s\n", buffer);
      break;
    case SIOCGIWNAME:
      printf("Protocol:%-1.16s\n", event->u.name);
      break;
    case IWEVQUAL:
      {
	event->u.qual.updated = 0x0;	/* Not that reliable, disable */
	iw_print_stats(buffer, sizeof(buffer),
		       &event->u.qual, iw_range, has_range);
	printf("Link %s\n", buffer);
	break;
      }
    default:
      printf("(Unknown Wireless event 0x%04X)\n", event->cmd);
    }	/* switch(event->cmd) */

  return(0);
}

/*------------------------------------------------------------------*/
/*
 * Print out all Wireless Events part of the RTNetlink message
 * Most often, there will be only one event per message, but
 * just make sure we read everything...
 */
static inline int
print_event_stream(int		ifindex,
		   char *	data,
		   int		len)
{
  struct iw_event	iwe;
  struct stream_descr	stream;
  int			i = 0;
  int			ret;
  char			buffer[64];
  struct timeval	recv_time;
  struct timezone	tz;
  struct wireless_iface *	wireless_data;

  /* Get data from cache */
  wireless_data = iw_get_interface_data(ifindex);
  if(wireless_data == NULL)
    return(-1);

  /* Print received time in readable form */
  gettimeofday(&recv_time, &tz);
  iw_print_timeval(buffer, sizeof(buffer), &recv_time, &tz);

  iw_init_event_stream(&stream, data, len);
  do
    {
      /* Extract an event and print it */
      ret = iw_extract_event_stream(&stream, &iwe,
				    wireless_data->range.we_version_compiled);
      if(ret != 0)
	{
	  if(i++ == 0)
	    printf("%s   %-8.16s ", buffer, wireless_data->ifname);
	  else
	    printf("                           ");
	  if(ret > 0)
	    print_event_token(&iwe,
			      &wireless_data->range, wireless_data->has_range);
	  else
	    printf("(Invalid event)\n");
	  /* Push data out *now*, in case we are redirected to a pipe */
	  fflush(stdout);
	}
    }
  while(ret > 0);

  return(0);
}

/*********************** RTNETLINK EVENT DUMP***********************/
/*
 * Dump the events we receive from rtnetlink
 * This code is mostly from Casey
 */

/*------------------------------------------------------------------*/
/*
 * Respond to a single RTM_NEWLINK event from the rtnetlink socket.
 */
static int
LinkCatcher(struct nlmsghdr *nlh)
{
  struct ifinfomsg* ifi;

#if 0
  fprintf(stderr, "nlmsg_type = %d.\n", nlh->nlmsg_type);
#endif

  ifi = NLMSG_DATA(nlh);

  /* Code is ugly, but sort of works - Jean II */

  /* If interface is getting destoyed */
  if(nlh->nlmsg_type == RTM_DELLINK)
    {
      /* Remove from cache (if in cache) */
      iw_del_interface_data(ifi->ifi_index);
      return 0;
    }

  /* Only keep add/change events */
  if(nlh->nlmsg_type != RTM_NEWLINK)
    return 0;

  /* Check for attributes */
  if (nlh->nlmsg_len > NLMSG_ALIGN(sizeof(struct ifinfomsg)))
    {
      int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(sizeof(struct ifinfomsg));
      struct rtattr *attr = (void *) ((char *) ifi +
				      NLMSG_ALIGN(sizeof(struct ifinfomsg)));

      while (RTA_OK(attr, attrlen))
	{
	  /* Check if the Wireless kind */
	  if(attr->rta_type == IFLA_WIRELESS)
	    {
	      /* Go to display it */
	      print_event_stream(ifi->ifi_index,
				 (char *) attr + RTA_ALIGN(sizeof(struct rtattr)),
				 attr->rta_len - RTA_ALIGN(sizeof(struct rtattr)));
	    }
	  attr = RTA_NEXT(attr, attrlen);
	}
    }

  return 0;
}

/* ---------------------------------------------------------------- */
/*
 * We must watch the rtnelink socket for events.
 * This routine handles those events (i.e., call this when rth.fd
 * is ready to read).
 */
static inline void
handle_netlink_events(struct rtnl_handle *	rth)
{
  while(1)
    {
      struct sockaddr_nl sanl;
      socklen_t sanllen = sizeof(struct sockaddr_nl);

      struct nlmsghdr *h;
      int amt;
      char buf[8192];

      amt = recvfrom(rth->fd, buf, sizeof(buf), MSG_DONTWAIT, (struct sockaddr*)&sanl, &sanllen);
      if(amt < 0)
	{
	  if(errno != EINTR && errno != EAGAIN)
	    {
	      fprintf(stderr, "%s: error reading netlink: %s.\n",
		      __PRETTY_FUNCTION__, strerror(errno));
	    }
	  return;
	}

      if(amt == 0)
	{
	  fprintf(stderr, "%s: EOF on netlink??\n", __PRETTY_FUNCTION__);
	  return;
	}

      h = (struct nlmsghdr*)buf;
      while(amt >= (int)sizeof(*h))
	{
	  int len = h->nlmsg_len;
	  int l = len - sizeof(*h);

	  if(l < 0 || len > amt)
	    {
	      fprintf(stderr, "%s: malformed netlink message: len=%d\n", __PRETTY_FUNCTION__, len);
	      break;
	    }

	  switch(h->nlmsg_type)
	    {
	    case RTM_NEWLINK:
	    case RTM_DELLINK:
	      LinkCatcher(h);
	      break;
	    default:
#if 0
	      fprintf(stderr, "%s: got nlmsg of type %#x.\n", __PRETTY_FUNCTION__, h->nlmsg_type);
#endif
	      break;
	    }

	  len = NLMSG_ALIGN(len);
	  amt -= len;
	  h = (struct nlmsghdr*)((char*)h + len);
	}

      if(amt > 0)
	fprintf(stderr, "%s: remnant of size %d on netlink\n", __PRETTY_FUNCTION__, amt);
    }
}

/**************************** MAIN LOOP ****************************/

/* ---------------------------------------------------------------- */
/*
 * Wait until we get an event
 */
static inline int
wait_for_event(struct rtnl_handle *	rth)
{
#if 0
  struct timeval	tv;	/* Select timeout */
#endif

  /* Forever */
  while(1)
    {
      fd_set		rfds;		/* File descriptors for select */
      int		last_fd;	/* Last fd */
      int		ret;

      /* Guess what ? We must re-generate rfds each time */
      FD_ZERO(&rfds);
      FD_SET(rth->fd, &rfds);
      last_fd = rth->fd;

      /* Wait until something happens */
      ret = select(last_fd + 1, &rfds, NULL, NULL, NULL);

      /* Check if there was an error */
      if(ret < 0)
	{
	  if(errno == EAGAIN || errno == EINTR)
	    continue;
	  fprintf(stderr, "Unhandled signal - exiting...\n");
	  break;
	}

      /* Check if there was a timeout */
      if(ret == 0)
	{
	  continue;
	}

      /* Check for interface discovery events. */
      if(FD_ISSET(rth->fd, &rfds))
	handle_netlink_events(rth);
    }

  return(0);
}

/******************************* MAIN *******************************/

/* ---------------------------------------------------------------- */
/*
 * helper ;-)
 */
static void
iw_usage(int status)
{
  fputs("Usage: iwevent [OPTIONS]\n"
	"   Monitors and displays Wireless Events.\n"
	"   Options are:\n"
	"     -h,--help     Print this message.\n"
	"     -v,--version  Show version of this program.\n",
	status ? stderr : stdout);
  exit(status);
}
/* Command line options */
static const struct option long_opts[] = {
  { "help", no_argument, NULL, 'h' },
  { "version", no_argument, NULL, 'v' },
  { NULL, 0, NULL, 0 }
};

/* ---------------------------------------------------------------- */
/*
 * main body of the program
 */
int
main(int	argc,
     char *	argv[])
{
  struct rtnl_handle	rth;
  int opt;

  /* Check command line options */
  while((opt = getopt_long(argc, argv, "hv", long_opts, NULL)) > 0)
    {
      switch(opt)
	{
	case 'h':
	  iw_usage(0);
	  break;

	case 'v':
	  return(iw_print_version_info("iwevent"));
	  break;

	default:
	  iw_usage(1);
	  break;
	}
    }
  if(optind < argc)
    {
      fputs("Too many arguments.\n", stderr);
      iw_usage(1);
    }

  /* Open netlink channel */
  if(rtnl_open(&rth, RTMGRP_LINK) < 0)
    {
      perror("Can't initialize rtnetlink socket");
      return(1);
    }

  fprintf(stderr, "Waiting for Wireless Events from interfaces...\n");

  /* Do what we have to do */
  wait_for_event(&rth);

  /* Cleanup - only if you are pedantic */
  rtnl_close(&rth);

  return(0);
}