1 files changed, 84 insertions, 0 deletions
diff --git a/zen/socket.h b/zen/socket.h
new file mode 100755
index 00000000..c92071e2
--- /dev/null
+++ b/zen/socket.h
@@ -0,0 +1,84 @@
+// *****************************************************************************
+// * This file is part of the FreeFileSync project. It is distributed under    *
+// * GNU General Public License: https://www.gnu.org/licenses/gpl-3.0          *
+// * Copyright (C) Zenju (zenju AT freefilesync DOT org) - All Rights Reserved *
+// *****************************************************************************
+
+#ifndef SOCKET_H_23498325972583947678456437
+#define SOCKET_H_23498325972583947678456437
+
+#include <zen/zstring.h>
+#include "sys_error.h"
+    #include <unistd.h> //close
+    #include <sys/socket.h>
+    #include <netdb.h> //getaddrinfo
+
+
+namespace zen
+{
+#define THROW_LAST_SYS_ERROR_WSA(functionName)                       \
+    do { const ErrorCode ecInternal = getLastError(); throw SysError(formatSystemError(functionName, ecInternal)); } while (false)
+
+
+//Winsock needs to be initialized before calling any of these functions! (WSAStartup/WSACleanup)
+
+class Socket //throw SysError
+{
+public:
+    Socket(const Zstring& server, const Zstring& serviceName) //throw SysError
+    {
+        ::addrinfo hints = {};
+        hints.ai_socktype = SOCK_STREAM; //we *do* care about this one!
+        hints.ai_flags = AI_ADDRCONFIG; //save a AAAA lookup on machines that can't use the returned data anyhow
+
+        ::addrinfo* servinfo = nullptr;
+        ZEN_ON_SCOPE_EXIT(if (servinfo) ::freeaddrinfo(servinfo));
+
+        const int rcGai = ::getaddrinfo(server.c_str(), serviceName.c_str(), &hints, &servinfo);
+        if (rcGai != 0)
+            throw SysError(formatSystemError(L"getaddrinfo", replaceCpy(_("Error Code %x"), L"%x", numberTo<std::wstring>(rcGai)), utfTo<std::wstring>(::gai_strerror(rcGai))));
+        if (!servinfo)
+            throw SysError(L"getaddrinfo: empty server info");
+
+        auto getConnectedSocket = [&](const auto& /*::addrinfo*/ ai)
+        {
+            SocketType testSocket = ::socket(ai.ai_family, ai.ai_socktype, ai.ai_protocol);
+            if (testSocket == invalidSocket)
+                THROW_LAST_SYS_ERROR_WSA(L"socket");
+            ZEN_ON_SCOPE_FAIL(closeSocket(testSocket));
+
+            if (::connect(testSocket, ai.ai_addr, static_cast<int>(ai.ai_addrlen)) != 0)
+                THROW_LAST_SYS_ERROR_WSA(L"connect");
+
+            return testSocket;
+        };
+
+        Opt<SysError> firstError;
+        for (const auto* /*::addrinfo*/ si = servinfo; si; si = si->ai_next)
+            try
+            {
+                socket_ = getConnectedSocket(*si); //throw SysError; pass ownership
+                return;
+            }
+            catch (const SysError& e) { if (!firstError) firstError = e; }
+
+        throw* firstError; //list was not empty, so there must have been an error!
+    }
+
+    ~Socket() { closeSocket(socket_); }
+
+    using SocketType = int;
+    SocketType get() const { return socket_; }
+
+private:
+    Socket           (const Socket&) = delete;
+    Socket& operator=(const Socket&) = delete;
+
+    static const SocketType invalidSocket = -1;
+    static void closeSocket(SocketType s) { ::close(s); }
+
+    SocketType socket_ = invalidSocket;
+};
+}
+
+#endif //SOCKET_H_23498325972583947678456437