Add active tests for IPv4

tests/active_tests/src/packet_capturer.cpp

@@ -0,0 +1,104 @@
+/*
+ * Copyright (c) 2016, Matias Fontanini
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following disclaimer
+ *   in the documentation and/or other materials provided with the
+ *   distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <sstream>
+#include <functional>
+#include <mutex>
+#include <condition_variable>
+#include "packet_capturer.h"
+
+using std::string;
+using std::thread;
+using std::move;
+using std::bind;
+using std::condition_variable;
+using std::unique_lock;
+using std::lock_guard;
+using std::mutex;
+using std::ostringstream;
+
+using Tins::PDU;
+using Tins::Sniffer;
+using Tins::SnifferConfiguration;
+
+PacketCapturer::PacketCapturer(const Configuration& configuration) {
+
+    SnifferConfiguration sniffer_config;
+    sniffer_config.set_filter(make_filter(configuration));
+    sniffer_config.set_immediate_mode(true);
+    sniffer_.reset(new Sniffer(configuration.interface().name(), sniffer_config));
+}
+
+void PacketCapturer::start_capture() {
+    using std::placeholders::_1;
+
+    mutex mtx;
+    condition_variable cond;
+    bool started = false;
+
+    running_ = true;
+    sniffer_thread_ = thread([&]() {
+        {
+            lock_guard<mutex> _(mtx);
+            started = true;
+            cond.notify_one();
+        }
+        sniffer_->sniff_loop(bind(&PacketCapturer::callback, this, _1));
+    });
+
+    unique_lock<mutex> locker(mtx);
+    while (!started) {
+        cond.wait(locker);
+    }
+}
+
+void PacketCapturer::stop_capture() {
+    running_ = false;
+    sniffer_->stop_sniff();
+    sniffer_thread_.join();
+}
+
+PacketCapturer::PacketStorage PacketCapturer::captured_packets() {
+    return move(storage_);
+}
+
+bool PacketCapturer::callback(const PDU& pdu) {
+    storage_.emplace_back(pdu.clone());
+    return running_;
+}
+
+string PacketCapturer::make_filter(const Configuration& configuration) const {
+    ostringstream oss;
+    oss << "((tcp or udp) and src port " << configuration.source_port() 
+        << " and dst port " << configuration.destination_port() << ") or icmp"
+        // Fragmentted IP packets
+        << " or (ip[6:2] & 0x1fff) > 0";
+    return oss.str();
+}
+