add a comment explaining the #if

1 files changed, 3 insertions, 2 deletions

diff --git a/noncore/net/wellenreiter/libwellenreiter/source/cardmode.cc b/noncore/net/wellenreiter/libwellenreiter/source/cardmode.cc
index 3e6c476..a512bc5 100644
--- a/noncore/net/wellenreiter/libwellenreiter/source/cardmode.cc
+++ b/noncore/net/wellenreiter/libwellenreiter/source/cardmode.cc
@@ -1,268 +1,269 @@
 /* 
  * Set card modes for sniffing
  *
  * $Id$
  */
 
 #include "cardmode.hh"
 #include "wl_log.hh"
 
 /* main card into monitor function */
 int card_into_monitormode (pcap_t **orighandle, const char *device, int cardtype)
 {
   char CiscoRFMON[35] = "/proc/driver/aironet/";
   FILE *CISCO_CONFIG_FILE;
 
   /* Checks if we have a device to sniff on */
   if(device == NULL)
   {
       wl_logerr("No device given");
       return 0;
   }
   
   /* Setting the promiscous and up flag to the interface */
   if (!card_set_promisc_up(device))
   {
     wl_logerr("Cannot set interface to promisc mode");
     return 0;
   } 
   wl_loginfo("Interface set to promisc mode");
   
   /* Check the cardtype and executes the commands to go into monitor mode */
   if (cardtype == CARD_TYPE_CISCO)
   {
       /* bring the sniffer into rfmon  mode */
       snprintf(CiscoRFMON, sizeof(CiscoRFMON) - 1, DEFAULT_PATH, device);
       if((CISCO_CONFIG_FILE = fopen(CiscoRFMON,"w")) == NULL)
       {
 	  wl_logerr("Cannot open config file: %s", strerror(errno));
 	  return 0;
       }
       fputs ("Mode: r",CISCO_CONFIG_FILE);
       fputs ("Mode: y",CISCO_CONFIG_FILE);
       fputs ("XmitPower: 1",CISCO_CONFIG_FILE);
       fclose(CISCO_CONFIG_FILE);
   }
   else if (cardtype == CARD_TYPE_NG)
   {
       char wlanngcmd[80];
       snprintf(wlanngcmd, sizeof(wlanngcmd) - 1, "$(which wlanctl-ng) %s lnxreq_wlansniff channel=%d enable=true", device, 1);
       if (system(wlanngcmd) != 0)
       {
 	  wl_logerr("Could not set %s in raw mode, check cardtype", device);
 	  return 0;
       }
   }
   else if (cardtype == CARD_TYPE_HOSTAP)
   {
-#if WIRELESS_EXT < 15
+#if WIRELESS_EXT > 14
+          // IW_MODE_MONITOR was implemented in Wireless Extensions Version 15
 	  int skfd;
 	  skfd = socket(AF_INET, SOCK_STREAM, 0);
 	  struct iwreq wrq;
 	  wrq.u.mode = IW_MODE_MONITOR;
 
 	  if(iw_set_ext(skfd,(char *) device,SIOCSIWMODE,&wrq)<0)
  	 {
   	  wl_logerr("Could not set hostap card %s to raw mode, check cardtype", device);
   	  return 0;
       }
       else
       {
 	    wl_loginfo("Successfully set hostap card %s into raw mode",device);
 	    return 1;
       }
     return 1;
 #else
-#warning Hi _MAX_, please use a system call for hostap with wireless extensions < 14
+#warning Hi _MAX_, please use a system call for hostap with wireless extensions < 15
   // TODO: Implement switching HOSTAP into monitor mode with system call
 #endif
   }
   else if (cardtype == CARD_TYPE_ORINOCCO )
   {
 	 if (!card_set_channel (device, 1, CARD_TYPE_ORINOCCO))
 	 {
   	  wl_logerr("Could not set %s in raw mode, check cardtype", device);
   	  return 0;
       }
       else
       {
 	    wl_loginfo("Successfully set %s into raw mode",device);
       }
   }
 
   /* Setting the promiscous and up flag to the interface */
   if (!card_check_rfmon_datalink(device))
   {
     wl_logerr("Cannot set interface to rfmon mode");
     return 0;
   }
   else 
   {
     wl_loginfo("Interface set to rfmon mode");
   }
   return 1;
 }
 
 /* Check card is in the rfmon mode */
 int card_check_rfmon_datalink (const char *device)
 {
   int datalinktype=0;
   pcap_t *phandle;
   phandle = pcap_open_live((char *)device, 65,0,0,NULL);
   datalinktype = pcap_datalink (phandle);
   pcap_close(phandle);
 
   if (datalinktype != DLT_IEEE802_11) /* Rawmode is IEEE802_11 */
     {
         return 0;
     }
   else
   {
     wl_loginfo("Your successfully listen on %s in 802.11 raw mode", device);
     return 1; 
   }
 }
 
 /* Set card into promisc mode */
 int card_set_promisc_up (const char *device)
 {
     int err;
     /* First generate a socket to use with iocalls */
     int fd = socket(AF_INET, SOCK_DGRAM, 0);
     if (fd < 0)
     {
         /* In case of an error */
         perror("socket");
         return 0;
     }
 
     /* Fill an empty an interface structure with the right flags (UP and Promsic) */
     struct ifreq ifr;
     strncpy(ifr.ifr_name, device,10);
     ifr.ifr_flags = IFF_UP + IFF_PROMISC;
     err = ioctl(fd, SIOCSIFFLAGS, &ifr);
     if (err < 0)
     {
     	perror("Could not access the interface, ");
     	close(fd);
         return 0;
     }
     
     /* Get the informations back from the interface to check if the flags are correct */
     strncpy(ifr.ifr_name, device,10);
     err = ioctl(fd, SIOCGIFFLAGS, &ifr);
     if (err < 0)
     {
         perror("Could not access the interface, ");
     	close(fd);
         return 0;
     }
 
     if(ifr.ifr_flags && IFF_UP)
     {
     	close(fd);
         return 1;
     }
     else
     {
 		wl_logerr("Could not set promisc flag on %d", device);
 		close(fd);
         return 0;
     }
 }
 
 /* Set channel (Wireless frequency) of the device */
 int card_set_channel (const char *device, int channel, int cardtype)
 {
     if (cardtype == CARD_TYPE_CISCO || cardtype == CARD_TYPE_NG)
     {
     	/* Cisco and wlan-ng drivers don't need channelswitching */
     	return 1;
     }
     /* If it is a lucent orinocco card */ 
     else if (cardtype == CARD_TYPE_ORINOCCO)
     {
     	int fd;
    	//Wireless tools structure for the iocalls
    	struct iwreq ireq;  
    	int *ptr;
 	   /* Socket needed to use the iocall to */
 	   fd = socket(AF_INET, SOCK_STREAM, 0);
 
 	   if ( fd == -1 ) {
  	     return -1;
  	  }
 
 	   ptr = (int *) ireq.u.name;
 	   // This is the monitor mode for 802.11 non-prism header
 	   ptr[0] = 2;
 	   ptr[1] = channel;
 	   strcpy(ireq.ifr_ifrn.ifrn_name, device);
 	   if (ioctl( fd, SIOCIWFIRSTPRIV + 0x8, &ireq)==0)
 	   {
 		  /* All was fine... */
 		  close(fd);
   		wl_loginfo("Set channel %d on interface %s",channel, device);
 	       return 1;
 	   }
 	   else
 	   {
 	   	   /* iocall does not work */
 			close(fd);
 			wl_logerr("Could not set channel %d on %s, check cardtype",channel, device);
 			return 0;
 	   }
     }
 	/* when it is an hostap card you need another iocall for channel switching */
 	    else if (cardtype == CARD_TYPE_HOSTAP)
     {
 	  int skfd;  	
       skfd = socket(AF_INET, SOCK_STREAM, 0);
 	  struct iwreq wrq;
       iw_float2freq((double) channel, &wrq.u.freq);
 
 	  if(iw_set_ext(skfd,(char *) device,SIOCSIWFREQ,&wrq)<0)
  	 {
   	  wl_logerr("Could not set hostap card %s to channel %d", device, channel);
   	  return 0;
       }
       else
       {
 	    wl_loginfo("Successfully set hostap card %s to channel %d", device, channel);
 	    return 1;
       }
 	}
     /* For undefined situations */
 	return 0;
 }
 
 
 int card_detect_channels (char * device)
 {
 	int skfd;
     skfd = socket(AF_INET, SOCK_STREAM, 0);
     struct iw_range	range;
     /* Get list of frequencies / channels */
 		printf ("\n hostap card get the frequencies");
         /* Get list of frequencies / channels */
         if(iw_get_range_info(skfd, device, &range) < 0)
  	   {   /* We are failsave if something went wrong, asume only 11 channels */
  	   	return 11;
  	   }
  	   else
         {
         	if(range.num_frequency > 0)
 			{
 				return range.num_frequency;
 			}
 			else
 			{   /* We are failsave asume only 11 channels */
 				return 11;
 			}
 		}
 
 } /* End of card_detect_channels */ 
 
 int iw_get_range_info(int skfd, const char * ifname,  iw_range * range)
 {
   struct iwreq wrq2;