Move stream_id into a new file and rename it to StreamIdentifier

src/tcp_ip/stream_identifier.cpp

@@ -0,0 +1,131 @@
+/*
+ * 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 "tcp_ip/stream_identifier.h"
+
+#if TINS_IS_CXX11
+
+#include <algorithm>
+#include <tuple>
+#include "memory_helpers.h"
+#include "tcp.h"
+#include "udp.h"
+#include "ip.h"
+#include "ipv6.h"
+#include "exceptions.h"
+
+using std::swap;
+using std::tie;
+
+using Tins::Memory::OutputMemoryStream;
+
+namespace Tins {
+namespace TCPIP {
+
+StreamIdentifier::StreamIdentifier() 
+: min_address_port(0), max_address_port(0) {
+    min_address.fill(0);
+    max_address.fill(0);
+}
+
+StreamIdentifier::StreamIdentifier(const address_type& client_addr,
+                                   uint16_t client_port,
+                                   const address_type& server_addr,
+                                   uint16_t server_port) 
+: min_address(client_addr), max_address(server_addr), min_address_port(client_port),
+  max_address_port(server_port) {
+    if (min_address > max_address) {
+        swap(min_address, max_address);
+        swap(min_address_port, max_address_port);
+    }
+    else if (min_address == max_address && min_address_port > max_address_port) {
+        // If the address is the same, just sort ports
+        swap(min_address_port, max_address_port);
+    }
+}
+
+bool StreamIdentifier::operator<(const StreamIdentifier& rhs) const {
+    return tie(min_address, max_address, min_address_port, max_address_port) <
+           tie(rhs.min_address, rhs.max_address, rhs.min_address_port, rhs.max_address_port);
+}
+
+bool StreamIdentifier::operator==(const StreamIdentifier& rhs) const {
+    return tie(min_address, min_address_port, max_address, max_address_port) ==
+           tie(rhs.min_address, rhs.min_address_port, rhs.max_address, rhs.max_address_port);
+}
+
+StreamIdentifier StreamIdentifier::make_identifier(const PDU& packet) {
+    uint16_t source_port;
+    uint16_t dest_port;
+    // Extract source and dest ports
+    if (const TCP* tcp = packet.find_pdu<TCP>()) {
+        source_port = tcp->sport();
+        dest_port = tcp->dport();
+    }
+    else if (const UDP* udp = packet.find_pdu<UDP>()) {
+        source_port = udp->sport();
+        dest_port = udp->dport();
+    }
+    else {
+        throw invalid_packet();
+    }
+    // Extract layer 3 and build the identifier
+    if (const IP* ip = packet.find_pdu<IP>()) {
+        return StreamIdentifier(serialize(ip->src_addr()), source_port,
+                                serialize(ip->dst_addr()), dest_port);
+    }
+    else if (const IPv6* ip = packet.find_pdu<IPv6>()) {
+        return StreamIdentifier(serialize(ip->src_addr()), source_port,
+                                serialize(ip->dst_addr()), dest_port);
+    }
+    else {
+        throw invalid_packet();
+    }
+}
+
+StreamIdentifier::address_type StreamIdentifier::serialize(IPv4Address address) {
+    address_type addr;
+    OutputMemoryStream output(addr.data(), addr.size());
+    addr.fill(0);
+    output.write(address);
+    return addr; 
+}
+
+StreamIdentifier::address_type StreamIdentifier::serialize(const IPv6Address& address) {
+    address_type addr;
+    OutputMemoryStream output(addr.data(), addr.size());
+    addr.fill(0);
+    output.write(address);
+    return addr;
+}
+
+} // TCPIP
+} // Tins
+
+#endif // TINS_IS_CXX11