Added NetworkInterface class. Needs testing.

src/network_interface.cpp

@@ -0,0 +1,71 @@
+/*
+ * libtins is a net packet wrapper library for crafting and
+ * interpreting sniffed packets.
+ *
+ * Copyright (C) 2011 Nasel
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <stdexcept>
+#ifndef WIN32
+    #include <linux/if_packet.h>
+    #include <net/if.h>
+#endif
+#include "network_interface.h"
+#include "utils.h"
+
+/** \cond */
+template<typename Address>
+struct HWAddressCollector {
+    Address *result;
+    int iface_id;
+    bool found;
+
+    HWAddressCollector(Tins::HWAddress<6> *res, int id) 
+    : result(res), iface_id(id), found(false){ }
+
+    bool operator() (struct ifaddrs *addr) {
+        const struct sockaddr_ll* addr_ptr = ((struct sockaddr_ll*)addr->ifa_addr);
+        if(!found && addr->ifa_addr->sa_family == AF_PACKET && addr_ptr->sll_ifindex == iface_id) {
+            *result = addr_ptr->sll_addr;
+            found = true;
+        }
+        return found;
+    }
+};
+
+namespace Tins {
+NetworkInterface::NetworkInterface(const std::string &name) {
+    iface_id = if_nametoindex(name.c_str());
+    if(!iface_id)
+        throw std::runtime_error("Invalid interface error");
+}
+
+NetworkInterface::NetworkInterface(id_type id) 
+: iface_id(id) {
+    
+}
+
+NetworkInterface::address_type NetworkInterface::address() {
+    address_type addr;
+    ::HWAddressCollector<address_type> collector(&addr, iface_id);
+    Utils::generic_iface_loop(collector);
+    if(!collector.found)
+        throw std::runtime_error("Error looking up interface address");
+    return addr;
+}
+}
+