issue zeromq#25 try to guess wifi nic

C/configure.in

@@ -206,6 +206,12 @@ esac
 AC_HEADER_STDC
 AC_CHECK_HEADERS(errno.h arpa/inet.h netinet/tcp.h netinet/in.h stddef.h \
 stdlib.h string.h sys/socket.h sys/time.h unistd.h limits.h)
+AC_CHECK_HEADERS([net/if.h net/if_media.h linux/wireless.h], [], [],
+[
+#ifdef HAVE_SYS_SOCKET_H
+# include <sys/socket.h>
+#endif
+])
 
 # Checks for typedefs, structures, and compiler characteristics.
 AC_HEADER_STDBOOL

C/src/zre_udp.c

@@ -26,6 +26,18 @@
 
 #include <czmq.h>
 #include "../include/zre.h"
+#include "platform.h"
+
+#ifdef HAVE_LINUX_WIRELESS_H
+# include <linux/wireless.h>
+#else
+# ifdef HAVE_NET_IF_H
+# include <net/if.h>
+# endif
+# ifdef HAVE_NET_IF_MEDIA_H
+# include <net/if_media.h>
+# endif
+#endif
 
 // -----------------------------------------------------------------
 // UDP instance
@@ -81,6 +93,35 @@ s_handle_io_error (char *reason)
  }
 }
 
+// check if given NIC name is wireless
+static bool
+s_wireless_nic (const char* name)
+{
+ int sock = 0;
+ bool result = FALSE;
+
+ if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
+ return FALSE;
+ }
+# ifdef SIOCGIFMEDIA
+ struct ifmediareq ifmr;
+
+ memset (&ifmr, 0, sizeof (struct ifmediareq));
+ strlcpy(ifmr.ifm_name, name, sizeof(ifmr.ifm_name));
+ if (ioctl(sock, SIOCGIFMEDIA, (caddr_t) &ifmr) != -1) {
+ result = IFM_TYPE (ifmr.ifm_current) == IFM_IEEE80211;
+ }
+# elif defined(SIOCGIWNAME)
+ struct iwreq wrq;
+
+ strncpy (wrq.ifr_name, name, IFNAMSIZ);
+ if (ioctl(sock, SIOCGIWNAME, (caddr_t) &wrq) != -1) {
+ result = TRUE;
+ }
+# endif
+ close(sock);
+ return result;
+}
 
 // -----------------------------------------------------------------
 // Constructor
@@ -132,6 +173,9 @@ zre_udp_new (int port_nbr)
  self->address = *(struct sockaddr_in *) interface->ifa_addr;
  self->broadcast = *(struct sockaddr_in *) interface->ifa_broadaddr;
  self->broadcast.sin_port = htons (self->port_nbr);
+
+ if (s_wireless_nic (interface->ifa_name))
+ break;
  }
  interface = interface->ifa_next;
  }