applications: Add common class for source applications

Proposed by Sharan Naribole

src/applications/CMakeLists.txt

@@ -15,6 +15,7 @@ build_lib(
     model/seq-ts-echo-header.cc
     model/seq-ts-header.cc
     model/seq-ts-size-header.cc
+    model/source-application.cc
     model/three-gpp-http-client.cc
     model/three-gpp-http-header.cc
     model/three-gpp-http-server.cc
@@ -39,6 +40,7 @@ build_lib(
     model/seq-ts-echo-header.h
     model/seq-ts-header.h
     model/seq-ts-size-header.h
+    model/source-application.h
     model/three-gpp-http-client.h
     model/three-gpp-http-header.h
     model/three-gpp-http-server.h

src/applications/model/source-application.cc

@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2024 DERONNE SOFTWARE ENGINEERING
+ *
+ * SPDX-License-Identifier: GPL-2.0-only
+ *
+ * Author: Sébastien Deronne <sebastien.deronne@gmail.com>
+ */
+
+#include "source-application.h"
+
+#include "ns3/log.h"
+#include "ns3/uinteger.h"
+
+namespace ns3
+{
+
+NS_LOG_COMPONENT_DEFINE("SourceApplication");
+
+NS_OBJECT_ENSURE_REGISTERED(SourceApplication);
+
+TypeId
+SourceApplication::GetTypeId()
+{
+    static TypeId tid =
+        TypeId("ns3::SourceApplication")
+            .SetParent<Application>()
+            .SetGroupName("Applications")
+            .AddAttribute(
+                "Remote",
+                "The address of the destination, made of the remote IP address and the "
+                "destination port",
+                AddressValue(),
+                MakeAddressAccessor(&SourceApplication::SetRemote, &SourceApplication::GetRemote),
+                MakeAddressChecker())
+            .AddAttribute("Local",
+                          "The Address on which to bind the socket. If not set, it is generated "
+                          "automatically when needed by the application.",
+                          AddressValue(),
+                          MakeAddressAccessor(&SourceApplication::m_local),
+                          MakeAddressChecker())
+            .AddAttribute("Tos",
+                          "The Type of Service used to send IPv4 packets. "
+                          "All 8 bits of the TOS byte are set (including ECN bits).",
+                          UintegerValue(0),
+                          MakeUintegerAccessor(&SourceApplication::m_tos),
+                          MakeUintegerChecker<uint8_t>());
+    return tid;
+}
+
+SourceApplication::SourceApplication()
+    : m_peer{}
+{
+    NS_LOG_FUNCTION(this);
+}
+
+SourceApplication::~SourceApplication()
+{
+    NS_LOG_FUNCTION(this);
+}
+
+void
+SourceApplication::SetRemote(const Address& addr)
+{
+    NS_LOG_FUNCTION(this << addr);
+    if (!addr.IsInvalid())
+    {
+        m_peer = addr;
+    }
+}
+
+Address
+SourceApplication::GetRemote() const
+{
+    return m_peer;
+}
+
+} // Namespace ns3

src/applications/model/source-application.h

@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2024 DERONNE SOFTWARE ENGINEERING
+ *
+ * SPDX-License-Identifier: GPL-2.0-only
+ *
+ * Author: Sébastien Deronne <sebastien.deronne@gmail.com>
+ */
+
+#ifndef SOURCE_APPLICATION_H
+#define SOURCE_APPLICATION_H
+
+#include "ns3/address.h"
+#include "ns3/application.h"
+
+namespace ns3
+{
+
+/**
+ * \ingroup applications
+ * \brief Base class for source applications.
+ *
+ * This class can be used as a base class for source applications.
+ * A source application is one that primarily sources new data towards a single remote client
+ * address and port, and may also receive data (such as an HTTP server).
+ *
+ * The main purpose of this base class application public API is to provide a uniform way to
+ * configure remote and local addresses.
+ *
+ * Unlike the SinkApplication, the SourceApplication does not expose an individual Port attribute.
+ * Instead, the port values are embedded in the Local and Remote address attributes, which should be
+ * configured to an InetSocketAddress or Inet6SocketAddress value that contains the desired port
+ * number.
+ */
+class SourceApplication : public Application
+{
+  public:
+    /**
+     * \brief Get the type ID.
+     * \return the object TypeId
+     */
+    static TypeId GetTypeId();
+
+    SourceApplication();
+    ~SourceApplication() override;
+
+    /**
+     * \brief set the remote address
+     * \param addr remote address
+     */
+    virtual void SetRemote(const Address& addr);
+
+    /**
+     * \brief get the remote address
+     * \return the remote address
+     */
+    Address GetRemote() const;
+
+  protected:
+    Address m_peer;  //!< Peer address
+    Address m_local; //!< Local address to bind to
+    uint8_t m_tos;   //!< The packets Type of Service
+};
+
+} // namespace ns3
+
+#endif /* SOURCE_APPLICATION_H */