Added RadioTap class.

include/radiotap.h

@@ -0,0 +1,73 @@
+/*
+ * 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
+ */
+
+#ifndef __RADIOTAP_H
+#define __RADIOTAP_H
+
+#include <stdexcept>
+#include "pdu.h"
+
+namespace Tins {
+    
+    /** 
+     * \brief Class that represents the IEEE 802.11 radio tap header.
+     */
+    class RadioTap {
+    public:
+        /**
+         * Creates an instance of RadioTap.
+         * \param iface The name of the interface in which to send this PDU.
+         */
+        RadioTap(const std::string &iface) throw (std::runtime_error);
+        
+        /**
+         * Creates an instance of RadioTap.
+         * \param iface_index The index of the interface in which to send this PDU.
+         */
+        RadioTap(uint32_t iface_index);
+        
+        /**
+         * \sa PDU::send()
+         */
+        bool send(PacketSender* sender);
+        
+        /**
+         * \brief Returns the 802.11 frame's header length.
+         *
+         * \return An uint32_t with the header's size.
+         * \sa PDU::header_size()
+         */
+        uint32_t header_size() const;
+    private:
+        struct radiotap_hdr {
+            u_int8_t it_version;	
+            u_int8_t it_pad;
+            u_int16_t it_len;
+            u_int32_t it_present;
+        } __attribute__((__packed__));
+        
+        void write_serialization(uint8_t *buffer, uint32_t total_sz, const PDU *parent);
+        
+        radiotap_hdr _radio;
+        uint32_t _iface_index;
+    };
+};
+#endif

src/radiotap.cpp

@@ -0,0 +1,63 @@
+/*
+ * 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 <cstring>
+#ifndef WIN32
+    #include <netpacket/packet.h>
+#endif
+#include "radiotap.h"
+#include "utils.h"
+
+
+Tins::RadioTap::RadioTap(const std::string &iface) throw (std::runtime_error) : PDU(0xff) {
+    if(!Utils::interface_id(iface, _iface_index))
+        throw std::runtime_error("Invalid interface name!");
+    std::memset(&_radio, 0, sizeof(_radio));
+}
+
+Tins::RadioTap::RadioTap(uint32_t iface_index) : PDU(0xff), _iface_index(iface_index) {
+    std::memset(&_radio, 0, sizeof(_radio));
+}
+
+uint32_t Tins::RadioTap::header_size() const {
+    return sizeof(_radio);
+}
+
+bool Tins::RadioTap::send(PacketSender* sender) {
+    struct sockaddr_ll addr;
+
+    memset(&addr, 0, sizeof(struct sockaddr_ll));
+
+    addr.sll_family = Utils::net_to_host_s(PF_PACKET);
+    addr.sll_protocol = Utils::net_to_host_s(ETH_P_ALL);
+    addr.sll_halen = 6;
+    addr.sll_ifindex = _iface_index;
+    memcpy(&(addr.sll_addr), _header.dst_addr, 6);
+
+    return sender->send_l2(this, (struct sockaddr*)&addr, (uint32_t)sizeof(addr));
+}
+
+void Tins::RadioTap::write_serialization(uint8_t *buffer, uint32_t total_sz, const PDU *parent) {
+    uint32_t sz = header_size();
+    assert(total_sz >= sz);
+    _radio.it_len = sz;
+    memcpy(buffer, &_radio, sizeof(_radio));
+}