[Listener] Send IP in Hello messages

infrastructure-centred/owlps-listener/owlps-listener.h

@@ -78,6 +78,7 @@ int capture(void) ;
 void read_packet(u_char *args, const struct pcap_pkthdr *header,
                  const u_char *packet) ;
 void get_mac_addr(char *eth, unsigned char mac_bytes[6]) ;
+void get_ip_addr(char *eth, char *ip_bytes) ;
 
 #ifdef USE_PTHREAD
 void autocalibrate(void) ;

infrastructure-centred/owlps-listener/owlps-listenerd.c

@@ -8,7 +8,8 @@
 
 
 char *program_name = NULL ;
-unsigned char mac[6] ; // AP MAC address
+unsigned char my_mac[6] ; // AP MAC address
+char my_ip[16] ; // AP IP address
 
 int aggregation_sockfd ;
 struct sockaddr_in aggregation_server ;
@@ -101,10 +102,12 @@ int main(int argc, char *argv[])
     }
 #endif // USE_PTHREAD
 
-  get_mac_addr(GET_WIFI_IFACE(), mac) ;
-  mac_string = mac_bytes_to_string(mac) ;
+  get_mac_addr(GET_WIFI_IFACE(), my_mac) ;
+  mac_string = mac_bytes_to_string(my_mac) ;
   printf("My MAC address is: %s\n", mac_string) ;
   free(mac_string) ;
+  get_ip_addr(GET_WIFI_IFACE(), my_ip) ;
+  printf("My IP address is: %s\n", my_ip) ;
 
   ret = capture() ; // Capture loop
 
@@ -530,7 +533,7 @@ void read_packet(u_char *args, const struct pcap_pkthdr *header,
     printf("This packet is a Retry.\n") ;
 #endif // DEBUG
 
-  memcpy(couple.ap_mac_addr_bytes, mac, 6) ; // Copy AP MAC
+  memcpy(couple.ap_mac_addr_bytes, my_mac, 6) ; // Copy AP MAC
   // Source MAC address is 10 bytes after the 802.11 packet type:
   memcpy(couple.mobile_mac_addr_bytes, &data[rtap_bytes+10], 6) ;
   couple.start_time = header->ts ; // Capture time is in the pcap header
@@ -786,6 +789,35 @@ void get_mac_addr(char *eth, unsigned char mac_bytes[6])
 
 
 
+/*
+ * Get our own IP address and copy it to 'ip'.
+ */
+void get_ip_addr(char *eth, char ip[16])
+{
+  struct ifreq ifr;
+  int sockfd ;
+  struct sockaddr_in sa ;
+
+  sockfd = socket(AF_INET, SOCK_DGRAM, 0) ;
+  if(sockfd < 0)
+    perror("Cannot open socket to read IP address") ;
+
+  strncpy(ifr.ifr_name, eth, IFNAMSIZ) ;
+
+  if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0)
+    return ;
+
+  if (ioctl(sockfd, SIOCGIFADDR, &ifr) < 0)
+    return ;
+
+  strncpy(ip,
+          inet_ntoa(*(struct in_addr *)
+                    &ifr.ifr_addr.sa_data[sizeof(sa.sin_port)]),
+          16) ;
+}
+
+
+
 /* *** Autocalibration functions *** */
 #ifdef USE_PTHREAD
 
@@ -805,7 +837,8 @@ void autocalibrate_hello()
                                           GET_AUTOCALIBRATION_PORT(),
                                           &serv, &client) ;
 
-  memcpy(&message.ap_mac_addr_bytes, mac, 6) ;
+  memcpy(&message.ap_mac_addr_bytes, my_mac, 6) ;
+  strncpy(message.ap_ip_addr, my_ip, 16) ;
 
   while (run)
     {

libowlps/owlps.h

@@ -89,6 +89,7 @@ typedef struct _request
 typedef struct _autocalibration_hello
 {
   unsigned char ap_mac_addr_bytes[6];
+  char ap_ip_addr[16] ;
 } autocalibration_hello ;
 
 typedef struct _autocalibration_order