Wi-Fi Direct cmdline

src/DeviceIdFile.cpp

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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.
+ */
+
+#include "DeviceIdFile.hpp"
+#include <fstream>
+#include <stdexcept>
+#include <grp.h>
+#include <unistd.h>
+#include <sys/stat.h>
+
+using namespace pipedal;
+
+using namespace std;
+
+
+const char DeviceIdFile::DEVICEID_FILE_NAME[] = "/etc/pipedal/config/device_uuid";
+
+void DeviceIdFile::Load()
+{
+    ifstream f;
+
+    f.open(DEVICEID_FILE_NAME);
+    if (!f.is_open())
+    {
+        throw invalid_argument("Can't open file " + std::string(DEVICEID_FILE_NAME));
+    }
+
+    std::getline(f, uuid);
+    std::getline(f, deviceName);
+}
+void DeviceIdFile::Save()
+{
+    {
+        std::string path = DEVICEID_FILE_NAME;
+        ofstream f;
+        f.open(path, ios_base::trunc);
+        if (!f.is_open())
+        {
+            throw invalid_argument("Can't write to file " + path);
+        }
+
+        struct group *group_;
+        group_ = getgrnam("pipedal_d");
+        if (group_ == nullptr)
+        {
+            throw logic_error("Group not found: pipedal_d");
+        }
+        chown(path.c_str(),-1,group_->gr_gid);
+        chmod(path.c_str(), S_IWUSR | S_IRUSR | S_IRGRP | S_IROTH);
+
+
+        f << uuid << endl;
+        f << deviceName << endl;
+    }
+}