dns: skeleton passthrough mitm

stratosphere/ams_mitm/source/dns_mitm/dnsmitm_debug.cpp

@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 2018-2020 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
+ */
+#include <stratosphere.hpp>
+#include "../amsmitm_fs_utils.hpp"
+#include "dnsmitm_debug.hpp"
+
+namespace ams::mitm::socket::resolver {
+
+    #if 1
+
+    namespace {
+
+        ::FsFile g_log_file;
+        s64 g_log_ofs;
+
+        os::SdkMutex g_log_mutex;
+
+        char g_log_buf[0x400];
+
+    }
+
+    void InitializeDebug() {
+        /* Create the log file. */
+        mitm::fs::CreateAtmosphereSdFile("dns_log.txt", 0, ams::fs::CreateOption_None);
+
+        /* Open the log file. */
+        R_ABORT_UNLESS(mitm::fs::OpenAtmosphereSdFile(std::addressof(g_log_file), "dns_log.txt", ams::fs::OpenMode_ReadWrite | ams::fs::OpenMode_AllowAppend));
+
+        /* Get the current log offset. */
+        R_ABORT_UNLESS(::fsFileGetSize(std::addressof(g_log_file), std::addressof(g_log_ofs)));
+
+        /* Start a new log. */
+        LogDebug("\n---\n");
+    }
+
+    void LogDebug(const char *fmt, ...) {
+        std::scoped_lock lk(g_log_mutex);
+
+        int len = 0;
+        {
+            std::va_list vl;
+            va_start(vl, fmt);
+            len = util::VSNPrintf(g_log_buf, sizeof(g_log_buf), fmt, vl);
+            va_end(vl);
+        }
+
+        R_ABORT_UNLESS(::fsFileWrite(std::addressof(g_log_file), g_log_ofs, g_log_buf, len, FsWriteOption_Flush));
+        g_log_ofs += len;
+    }
+
+    #else
+
+    void InitializeDebug() {
+        /* ... */
+    }
+
+    void LogDebug(const char *fmt, ...) {
+        /* ... */
+    }
+
+    #endif
+
+}