Wi-Fi Direct cmdline

src/UnixSocket.hpp

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+/*
+ * MIT License
+ * 
+ * Copyright (c) 2022 Robin E. R. Davies
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is furnished to do
+ * so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#pragma once
+
+#include <string>
+#include <exception>
+
+struct sockaddr_un;
+
+namespace pipedal {
+
+    class UnixSocketException : public std::exception {
+    public:
+        UnixSocketException(int errno_);
+        UnixSocketException(const std::string what_,int errno_);
+        UnixSocketException(const std::string what_);
+
+        const char*what() const noexcept { return what_.c_str(); }
+
+        int get_errno() const { return errno_; }
+    private:
+        int errno_;
+        std::string what_;
+
+    };
+
+    namespace detail {
+        class UnixSocketData;
+    }
+    class UnixSocket {
+    public:
+        using sockaddr_t = sockaddr_un;
+
+        UnixSocket();
+        ~UnixSocket();
+
+        bool IsOpen() const;
+
+        /**
+         * @brief Prepare a server socket to recive data.
+         * 
+         * permissionGroup controls permissions on the socekt.
+         * Proceses that wish to read or write to the socket must belong to permissionGroup.
+         * @param socketName Server socket name.
+         * @param permissionGroup The group which is allowed to connect to this socket.
+         */
+        void Bind(const std::string&socketName,const std::string&permissionGroup);
+
+        /**
+         * @brief Prepare a socket to write to a server socket.
+         * 
+         * The optional groupPermission is applied to the client socket to allow 
+         * server process that are not highly privileged to write replies. The 
+         * server process must belong the group named by permissionGroup.
+         * 
+         * @param remoteSocketName The name of the server socket.
+         * @param permissionGroup` The permission to appy to the client socket.
+         */
+        void Connect(const std::string&remoteSocketName, const std::string &groupPermission = "");
+
+        void Close();
+
+
+        size_t Send(const void*buffer, size_t length);
+        size_t Receive(void *buffer, size_t length);
+
+        size_t ReceiveFrom(void*buffer, size_t length,std::string*fromAddress);
+        size_t SendTo(const void*buffer, size_t length,const std::string&toAddress);
+
+
+    private:
+        detail::UnixSocketData *data;
+    };
+
+};