start_sniff

6 files changed, 134 insertions, 33 deletions

diff --git a/noncore/net/wellenreiter/daemon/source/daemon.cc b/noncore/net/wellenreiter/daemon/source/daemon.cc
index 3a28217..b840f17 100644
--- a/noncore/net/wellenreiter/daemon/source/daemon.cc
+++ b/noncore/net/wellenreiter/daemon/source/daemon.cc
@@ -2,73 +2,62 @@
  * Startup functions of wellenreiter
  *
  * $Id$
  */
 
 #include "config.hh"
 #include "daemon.hh"
 
 /* should be parsed from cfg-file */
 #define MAXCHANNEL 13
 #define CHANINTERVAL 500000
 
+
 /* Main function of wellenreiterd */
 int main(int argc, char **argv)
 {
   int sock, maxfd, retval;
   char buffer[WL_SOCKBUF];
   struct pcap_pkthdr header;
   struct sockaddr_in saddr;
-  pcap_t *handletopcap;
+//  pcap_t *handletopcap;
   wl_cardtype_t cardtype;
   pthread_t sub;
   const unsigned char *packet;
 
   fd_set rset;
 
   fprintf(stderr, "wellenreiterd %s\n\n", VERSION);
   fprintf(stderr, "(c) 2002 by M-M-M\n\n");
 
   if(argc < 3)
     usage();
   
   /* Set sniffer device */
   memset(cardtype.iface, 0, sizeof(cardtype.iface));
   strncpy(cardtype.iface, (char *)argv[1], sizeof(cardtype.iface) - 1);
 
   /* Set card type */
   cardtype.type = atoi(argv[2]);
   if(cardtype.type < 1 || cardtype.type > 4)
     usage();
 
-  /* set card into monitor mode */
-  if(!card_into_monitormode(&handletopcap, cardtype.iface, 
-                            cardtype.type))
-  {
-    wl_logerr("Cannot initialize the wireless-card, aborting");
-    exit(EXIT_FAILURE);
-  }
-  wl_loginfo("Set card into monitor mode");
-
-  /* setup pcap */
-  if((handletopcap = pcap_open_live(cardtype.iface, 
-                                    BUFSIZ, 1, 0, NULL)) == NULL)
+  /* Until we do not act as a read daemon, it starts the sniffer 
+     right after startup */
+  if (!start_sniffer(cardtype.iface,cardtype.type))
   {
-    wl_logerr("pcap_open_live() failed: %s", strerror(errno));
+          wl_logerr("daemon, start_sniff did not return proper, aborting");
     exit(EXIT_FAILURE);
   }
-  
-#ifdef HAVE_PCAP_NONBLOCK
-  pcap_setnonblock(handletopcap, 1, NULL);
-#endif
+  wl_loginfo ("daemon, wireless card prepared for sniffing");
   
   /* Setup socket for incoming commands */
   if((sock=wl_setupsock(DAEMONADDR, DAEMONPORT, saddr)) < 0)
   {
     wl_logerr("Cannot setup socket");
     exit(EXIT_FAILURE);
   } 
   wl_loginfo("Set up socket '%d' for GUI communication", sock);
 
   /* Create channelswitching thread */
   if(pthread_create(&sub, NULL, channel_switcher, 
                     (void *)&cardtype) != 0)
diff --git a/noncore/net/wellenreiter/libwellenreiter/source/cardmode.cc b/noncore/net/wellenreiter/libwellenreiter/source/cardmode.cc
index 7c9fbc4..4f187c0 100644
--- a/noncore/net/wellenreiter/libwellenreiter/source/cardmode.cc
+++ b/noncore/net/wellenreiter/libwellenreiter/source/cardmode.cc
@@ -1,23 +1,23 @@
 /* 
  * Set card modes for sniffing
  *
  * $Id$
  */
 
 #include "cardmode.hh"
 #include "wl_log.hh"
-
+pcap_t *handletopcap;
 /* main card into monitor function */
-int card_into_monitormode (pcap_t **orighandle, const char *device, int cardtype)
+int card_into_monitormode (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 */
@@ -143,24 +143,69 @@ int card_check_rfmon_datalink (const char *device)
 
   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; 
   }
 }
 
+/* Ipaq running familiar does not have a loopback device, we need one */
+int check_loopback()
+{
+    /* Checking for a loopback interface with 127.0.0.1, otherwise the other stuff seems to fail on
+     familiar linux on ipaq's */
+    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 */
+        wl_logerr("check_loopback, generation of a socket failed, cannot continue");
+        return 0;
+    }
+    /* Fill an empty an interface structure with the right flags (UP and Promsic) */
+    struct ifreq ifr;
+    strncpy(ifr.ifr_name, "lo",3);
+
+        /* Get the interface flags, loopback interfaces can be detected that way */
+    err = ioctl(fd, SIOCGIFFLAGS, &ifr);
+    if (err < 0)
+    {
+        wl_logerr("check_loopback, could not get the flags of lo, check if you got a lo loopback interface, cannot continue");
+            close(fd);
+        return 0;
+    }
+        /* Checking the flags for IFF_LOOPBACK flags */
+    if(ifr.ifr_flags && IFF_LOOPBACK)
+    {
+            /* Yes, we do have a loopback interface....sup! */
+            close(fd);
+        wl_loginfo ("check_loopback, check for loopback interface lo successful");
+        return 1;
+    }
+    else
+    {
+                wl_logerr("check_loopback, did not found an interface lo with the IFF_LOOPBACK flag set, cannot continue");
+                close(fd);
+        return 0;
+    }
+        /* Should never be reached */
+        return 0;
+} /*check_loopback */
+
+
 /* 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;
     }
@@ -206,34 +251,24 @@ int card_remove_promisc (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 flags from the interface*/
     strncpy(ifr.ifr_name, device,10);
     err = ioctl(fd, SIOCGIFFLAGS, &ifr);
     if (err < 0)
     {
         perror("Could not access the interface, ");
             close(fd);
         return 0;
     }
         /* Remove the IFF_PROMISC flag */
     ifr.ifr_flags = ifr.ifr_flags - IFF_PROMISC;
     /*Set the new flags to the interface*/
diff --git a/noncore/net/wellenreiter/libwellenreiter/source/cardmode.hh b/noncore/net/wellenreiter/libwellenreiter/source/cardmode.hh
index 58e99ac..73e0ae1 100644
--- a/noncore/net/wellenreiter/libwellenreiter/source/cardmode.hh
+++ b/noncore/net/wellenreiter/libwellenreiter/source/cardmode.hh
@@ -29,54 +29,56 @@ typedef unsigned long long u64;
 #include <linux/wireless.h>
 
 #ifndef SIOCIWFIRSTPRIV
 #define SIOCIWFIRSTPRIV SIOCDEVPRIVATE
 #endif
 
 extern "C"
 {
 #include <net/bpf.h>
 #include <pcap.h>  
 }
 
+extern pcap_t *handletopcap;
+
 /* Defines, used for the card setup */
 #define   DEFAULT_PATH       "/proc/driver/aironet/%s/Config"
 #define   CISCO_STATUS       "/proc/driver/aironet/%s/Status"
 #define   CARD_TYPE_CISCO       1
 #define   CARD_TYPE_NG          2
 #define   CARD_TYPE_HOSTAP      3
 #define   CARD_TYPE_ORINOCCO    4
 
 /* Some usefull constants for frequencies */
 #define KILO    1e3
 #define MEGA    1e6
 #define GIGA    1e9
 
 
 /* only for now, until we have the daemon running */
 /*the config file should provide these information */
 #define   CARD_TYPE              CARD_TYPE_HOSTAP
 
 /* Prototypes */
 int card_check_rfmon_datalink (const char *device);
-int card_into_monitormode (pcap_t **, const char *, int);
+int card_into_monitormode (const char *, int);
+int check_loopback();
 int card_set_promisc_up (const char *device);
 int card_remove_promisc (const char *device);
 int card_set_channel (const char *device, int channel,int cardtype); 
 int iw_get_range_info(int skfd, const char * ifname,  struct iw_range * range);
 double iw_freq2float(iw_freq * in);
         void iw_float2freq(double in, iw_freq *out);
 int card_detect_channels (char * device);
 
-
 /*------------------------------------------------------------------*/
 /*
  * Wrapper to push some Wireless Parameter in the driver
  */
 static inline int
         iw_set_ext(int                  skfd,   /* Socket to the kernel */
                    char *               ifname,         /* Device name */
                    int                  request,/* WE ID */
                    struct iwreq *       pwrq)   /* Fixed part of the request */
 {
   /* Set device name */
   strncpy(pwrq->ifr_name, ifname, IFNAMSIZ);
diff --git a/noncore/net/wellenreiter/libwellenreiter/source/sniff.cc b/noncore/net/wellenreiter/libwellenreiter/source/sniff.cc
index 6e512c4..0616a7e 100644
--- a/noncore/net/wellenreiter/libwellenreiter/source/sniff.cc
+++ b/noncore/net/wellenreiter/libwellenreiter/source/sniff.cc
@@ -1,24 +1,95 @@
 /* 
  *  rfmon mode sniffer
  *
  *  $Id$
  */
 
 #include "sniff.hh"
 #include "ieee802_11.hh"
 #include "extract.hh"
 #include "wl_log.hh"
 #include "wl_types.hh"
 #include "wl_proto.hh"
+#include "cardmode.hh"
+
+int start_sniffer(const char *device, int cardtype )
+{
+        
+        /* This function initialize the sniffing
+           1. Check for lo interface
+           2. bring it into promsicous mode and UP
+           3. bring device into rfmon mode
+           start the pcap sniffing process.
+          */
+
+          /* Do we have the device name ? */
+          if(device == NULL)
+          {
+              wl_logerr("start_sniffer, parameter \"device\" is empty, please check your config");
+              return 0;
+          }
+        
+        /* Some Linux System does not have a loopback device lo with 127.0.0.1 so sockets could 
+           not made correctly, let the proggie check that and proceed only if it exists. */
+        if (!check_loopback())
+        {
+                wl_logerr("start_sniffer, check_loopback failed, cannot continue without a loopback");
+                return 0;
+        }
+
+        /* Set the card into regulary promiscous mode first and set the UP flag, in case no ip 
+           was given. It would work without the promisc flags but i dont like this */
+        if (!card_set_promisc_up(device))
+        {
+                wl_logerr("start_sniffer, card_set_promisc_up failed, cannot continue");
+                return 0;
+            } 
+
+        /* Set card into the rfmon/monitoring mode */
+        if (!card_into_monitormode(device,cardtype))
+    {
+            wl_logerr("start_sniffer, cannot put wireless card into monitoring mode, aborting");
+                return 0;
+        }
+
+    /* setup pcap handle, used for the packet decoding etc. */
+    if((handletopcap = pcap_open_live((char *) device, BUFSIZ, 1, 0, NULL)) == NULL)
+    {
+            wl_logerr("pcap_open_live() failed: %s", strerror(errno));
+            return 0;
+    }
+  
+#ifdef HAVE_PCAP_NONBLOCK
+  pcap_setnonblock(handletopcap, 1, NULL);
+#endif
+        return 1;
+}
+
+
+int stop_sniffer(const char *device, int cardtype)
+{
+        /* This function terminates the sniffing 
+           1. get the device state
+           2. remove the rfmon state
+           3. Remove the promisc state
+           start the pcap sniffing process.
+           
+          */
+
+        /* Do we really have at least a lo interface with the 127.0.0.1 ? */
+                return 0;
+
+}
+
 
 /* Main function, checks packets */
 void process_packets(const struct pcap_pkthdr *pkthdr, 
                      const unsigned char *packet, 
                      char *guihost, 
                      int guiport)
 {
   unsigned int caplen = pkthdr->caplen;
   unsigned int length = pkthdr->len;
   u_int16_t fc;
   unsigned int HEADER_LENGTH;
   
diff --git a/noncore/net/wellenreiter/libwellenreiter/source/sniff.hh b/noncore/net/wellenreiter/libwellenreiter/source/sniff.hh
index c7108ac..a4cf4b7 100644
--- a/noncore/net/wellenreiter/libwellenreiter/source/sniff.hh
+++ b/noncore/net/wellenreiter/libwellenreiter/source/sniff.hh
@@ -31,29 +31,32 @@ struct packetinfo
   int fc_wep;
   int cap_WEP;
   int cap_IBSS;
   int cap_ESS;
   int channel;
   char bssid[sizeof("00:00:00:00:00:00") + 1];
   char desthwaddr[sizeof("00:00:00:00:00:00") + 1];
   char sndhwaddr[sizeof("00:00:00:00:00:00") + 1];
   char ssid[128];
   int ssid_len;
 };
 
+/* Function definitions  */
+/* Used for stoping and starting the sniffer process */
+int start_sniffer(const char *device, int cardtype);
+int stop_sniffer(const char *device, int cardtype);
 void process_packets(const struct pcap_pkthdr* pkthdr,const u_char* packet, char *, int);
 int decode_80211b_hdr(const u_char *p,struct packetinfo *ppinfo);
 void etheraddr_string(register const u_char *ep,char * text);
 int handle_beacon(u_int16_t fc, const u_char *p,struct packetinfo *ppinfo);
-
 int GetHeaderLength(u_int16_t fc);
 
 /*
  * True if  "l" bytes of "var" were captured.
  *
  * The "snapend - (l) <= snapend" checks to make sure "l" isn't so large
  * that "snapend - (l)" underflows.
  *
  * The check is for <= rather than < because "l" might be 0.
  */
 #define TTEST2(var, l) (snapend - (l) <= snapend && \
                         (const u_char *)&(var) <= snapend - (l))
diff --git a/noncore/net/wellenreiter/libwellenreiter/source/wl_types.hh b/noncore/net/wellenreiter/libwellenreiter/source/wl_types.hh
index cd482fe..afc105c 100644
--- a/noncore/net/wellenreiter/libwellenreiter/source/wl_types.hh
+++ b/noncore/net/wellenreiter/libwellenreiter/source/wl_types.hh
@@ -29,14 +29,15 @@ typedef struct {
   int net_type;    /* 1 = Accesspoint ; 2 = Ad-Hoc   */
   int ssid_len;    /* Length of SSID                 */
   int channel;     /* Channel                        */
   int wep;         /* 1 = WEP enabled ; 0 = disabled */
   char mac[64];    /* MAC address of Accesspoint     */
   char bssid[128]; /* BSSID of Net                   */
 } wl_network_t;
 
 /* Config specific */
 #define WL_CONFFILE "sample.conf"
 #define WL_CONFBUFF 128
 
+
 #endif /* WL_TYPES_HH */