#5 Add netutils

.vscode/tasks.json

@@ -12,10 +12,7 @@
                 "ENABLE_DEBUG=1",
                 "USE_GPSD=1"
             ],
-            "group": {
+            "group": "build",
-                "kind": "build",
-                "isDefault": true
-            },
             "problemMatcher": []
         },
         {
@@ -28,7 +25,10 @@
                 "ENABLE_DEBUG=1",
                 "USE_GPSD=1"
             ],
-            "group": "build",
+            "group": {
+                "kind": "build",
+                "isDefault": true
+            },
             "problemMatcher": []
         }
     ]

NetUtils.cpp

@@ -0,0 +1,49 @@
+/*
+ *   Copyright (c) 2022 by Geoffrey Merck F4FXL / KC3FRA
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <sys/types.h>
+#include <cstring>
+
+
+#include "NetUtils.h"
+
+bool CNetUtils::lookupPreferV6(const std::string& hostname, sockaddr_storage& addr)
+{
+    struct addrinfo hints;
+    ::memset(&hints, 0, sizeof(hints));
+    hints.ai_family = AF_INET6;
+
+    return lookup(hostname, addr, hints);
+}
+
+bool CNetUtils::lookup(const std::string& hostname, sockaddr_storage& addr, struct addrinfo& hints)
+{
+    struct addrinfo *res;
+
+    int err = getaddrinfo(hostname.c_str(), nullptr, &hints, &res);
+    if(err != 0) {
+        lookup("255.255.255.255", addr, hints);
+        return false;
+    }
+
+    ::memcpy(&addr, res->ai_addr, res->ai_addrlen);
+
+    ::freeaddrinfo(res);
+
+    return true;
+}

NetUtils.h

@@ -0,0 +1,30 @@
+/*
+ *   Copyright (c) 2022 by Geoffrey Merck F4FXL / KC3FRA
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#pragma once
+
+#include <string>
+#include <netdb.h>
+#include <sys/socket.h>
+
+class CNetUtils
+{
+public:
+    static bool lookupPreferV6(const std::string& hostname, sockaddr_storage& addr);
+    static bool lookup(const std::string& hostname, sockaddr_storage& addr, struct addrinfo& hints);
+};

Tests/NetUtils/lookup.cpp

@@ -0,0 +1,59 @@
+/*
+ *   Copyright (C) 2021-2022 by Geoffrey Merck F4FXL / KC3FRA
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <gtest/gtest.h>
+
+#include <netdb.h>
+
+#include "../../NetUtils.h"
+
+namespace NetUtilsTests
+{
+    class NetUtils_lookup: public ::testing::Test {
+    
+    };
+
+    TEST_F(NetUtils_lookup, googleShallAlwaysSucceed)
+    {
+        sockaddr_storage addr;
+        struct addrinfo hints;
+        ::memset(&hints, 0, sizeof(hints));
+
+        bool res = CNetUtils::lookup("google.fr", addr, hints);
+
+        bool familyOk = addr.ss_family == AF_INET6 || addr.ss_family == AF_INET;
+        EXPECT_TRUE(familyOk);
+        EXPECT_TRUE(res);
+    }
+
+    TEST_F(NetUtils_lookup, erroneousAddress)
+    {
+        sockaddr_storage addr;
+        struct addrinfo hints;
+        ::memset(&hints, 0, sizeof(hints));
+
+        bool res = CNetUtils::lookup("gfilufgclqsegfuligyhfcguyhfguilfguils4df64sdw46fcq6sfgvd6f6d7f67d6f7c6sd7f6s7gfv6fc7d6f76tf.fr", addr, hints);
+
+        EXPECT_EQ(addr.ss_family, AF_INET);
+
+        auto ptr = (sockaddr_in*)(&addr);
+
+        EXPECT_EQ((uint32_t)(ptr->sin_addr.s_addr), (uint32_t)INADDR_NONE);
+        EXPECT_FALSE(res);
+    }
+}

Tests/NetUtils/lookupPreferV6.cpp

@@ -0,0 +1,58 @@
+/*
+ *   Copyright (C) 2021-2022 by Geoffrey Merck F4FXL / KC3FRA
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <gtest/gtest.h>
+
+#include <netdb.h>
+
+#include "../../NetUtils.h"
+
+namespace NetUtilsTests
+{
+    class NetUtils_lookupPreferV6 : public ::testing::Test {
+    
+    };
+
+    TEST_F(NetUtils_lookupPreferV6, googleShallAlwaysSucceed)
+    {
+        sockaddr_storage addr;
+        struct addrinfo hints;
+        ::memset(&hints, 0, sizeof(hints));
+
+        bool res = CNetUtils::lookup("google.fr", addr, hints);
+
+        EXPECT_EQ(addr.ss_family, AF_INET6);
+        EXPECT_TRUE(res);
+    }
+
+    TEST_F(NetUtils_lookupPreferV6, erroneousAddress)
+    {
+        sockaddr_storage addr;
+        struct addrinfo hints;
+        ::memset(&hints, 0, sizeof(hints));
+
+        bool res = CNetUtils::lookup("gfilufgclqsegfuligyhfcguyhfguilfguils4df64sdw46fcq6sfgvd6f6d7f67d6f7c6sd7f6s7gfv6fc7d6f76tf.fr", addr, hints);
+
+        EXPECT_EQ(addr.ss_family, AF_INET);
+
+        auto ptr = (sockaddr_in*)(&addr);
+
+        EXPECT_EQ((uint32_t)(ptr->sin_addr.s_addr), (uint32_t)INADDR_NONE);
+        EXPECT_FALSE(res);
+    }
+}