LibIPC: Remove leading I from filenames

Libraries/LibIPC/ClientConnection.h

@@ -0,0 +1,208 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. 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 HOLDER 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.
+ */
+
+#pragma once
+
+#include <LibCore/CEvent.h>
+#include <LibCore/CEventLoop.h>
+#include <LibCore/CIODevice.h>
+#include <LibCore/CLocalSocket.h>
+#include <LibCore/CNotifier.h>
+#include <LibCore/CObject.h>
+#include <LibIPC/Endpoint.h>
+#include <LibIPC/Message.h>
+#include <errno.h>
+#include <stdio.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+namespace IPC {
+
+class Event : public Core::Event {
+public:
+    enum Type {
+        Invalid = 2000,
+        Disconnected,
+    };
+    Event() {}
+    explicit Event(Type type)
+        : Core::Event(type)
+    {
+    }
+};
+
+class DisconnectedEvent : public Event {
+public:
+    explicit DisconnectedEvent(int client_id)
+        : Event(Disconnected)
+        , m_client_id(client_id)
+    {
+    }
+
+    int client_id() const { return m_client_id; }
+
+private:
+    int m_client_id { 0 };
+};
+
+template<typename T, class... Args>
+NonnullRefPtr<T> new_client_connection(Args&&... args)
+{
+    return T::construct(forward<Args>(args)...) /* arghs */;
+}
+
+template<typename Endpoint>
+class ClientConnection : public Core::Object {
+public:
+    ClientConnection(Endpoint& endpoint, Core::LocalSocket& socket, int client_id)
+        : m_endpoint(endpoint)
+        , m_socket(socket)
+        , m_client_id(client_id)
+    {
+        ASSERT(socket.is_connected());
+        ucred creds;
+        socklen_t creds_size = sizeof(creds);
+        if (getsockopt(m_socket->fd(), SOL_SOCKET, SO_PEERCRED, &creds, &creds_size) < 0) {
+            ASSERT_NOT_REACHED();
+        }
+        m_client_pid = creds.pid;
+        add_child(socket);
+        m_socket->on_ready_to_read = [this] { drain_messages_from_client(); };
+    }
+
+    virtual ~ClientConnection() override
+    {
+    }
+
+    void post_message(const Message& message)
+    {
+        // NOTE: If this connection is being shut down, but has not yet been destroyed,
+        //       the socket will be closed. Don't try to send more messages.
+        if (!m_socket->is_open())
+            return;
+
+        auto buffer = message.encode();
+
+        int nwritten = write(m_socket->fd(), buffer.data(), (size_t)buffer.size());
+        if (nwritten < 0) {
+            switch (errno) {
+            case EPIPE:
+                dbg() << *this << "::post_message: Disconnected from peer";
+                shutdown();
+                return;
+            case EAGAIN:
+                dbg() << *this << "::post_message: Client buffer overflowed.";
+                did_misbehave();
+                return;
+            default:
+                perror("Connection::post_message write");
+                ASSERT_NOT_REACHED();
+            }
+        }
+
+        ASSERT(nwritten == buffer.size());
+    }
+
+    void drain_messages_from_client()
+    {
+        Vector<u8> bytes;
+        for (;;) {
+            u8 buffer[4096];
+            ssize_t nread = recv(m_socket->fd(), buffer, sizeof(buffer), MSG_DONTWAIT);
+            if (nread == 0 || (nread == -1 && errno == EAGAIN)) {
+                if (bytes.is_empty()) {
+                    Core::EventLoop::current().post_event(*this, make<DisconnectedEvent>(client_id()));
+                    return;
+                }
+                break;
+            }
+            if (nread < 0) {
+                perror("recv");
+                ASSERT_NOT_REACHED();
+            }
+            bytes.append(buffer, nread);
+        }
+
+        size_t decoded_bytes = 0;
+        for (size_t index = 0; index < (size_t)bytes.size(); index += decoded_bytes) {
+            auto remaining_bytes = ByteBuffer::wrap(bytes.data() + index, bytes.size() - index);
+            auto message = Endpoint::decode_message(remaining_bytes, decoded_bytes);
+            if (!message) {
+                dbg() << "drain_messages_from_client: Endpoint didn't recognize message";
+                did_misbehave();
+                return;
+            }
+            if (auto response = m_endpoint.handle(*message))
+                post_message(*response);
+            ASSERT(decoded_bytes);
+        }
+    }
+
+    void did_misbehave()
+    {
+        dbg() << *this << " (id=" << m_client_id << ", pid=" << m_client_pid << ") misbehaved, disconnecting.";
+        shutdown();
+    }
+
+    void did_misbehave(const char* message)
+    {
+        dbg() << *this << " (id=" << m_client_id << ", pid=" << m_client_pid << ") misbehaved (" << message << "), disconnecting.";
+        shutdown();
+    }
+
+    void shutdown()
+    {
+        m_socket->close();
+        die();
+    }
+
+    int client_id() const { return m_client_id; }
+    pid_t client_pid() const { return m_client_pid; }
+
+    virtual void die() = 0;
+
+protected:
+    void event(Core::Event& event) override
+    {
+        if (event.type() == Event::Disconnected) {
+            int client_id = static_cast<const DisconnectedEvent&>(event).client_id();
+            dbg() << *this << ": Client disconnected: " << client_id;
+            die();
+            return;
+        }
+
+        Core::Object::event(event);
+    }
+
+private:
+    Endpoint& m_endpoint;
+    RefPtr<Core::LocalSocket> m_socket;
+    int m_client_id { -1 };
+    int m_client_pid { -1 };
+};
+
+}