From 5c16cccac8bee859b6159b877b2431a4caba4a9a Mon Sep 17 00:00:00 2001
From: Semyon Knyazev <samael@altlinux.org>
Date: Wed, 18 Dec 2024 01:14:13 +0400
Subject: [PATCH] Add smb context wrapper

---
 src/adldap/samba/smb_context.cpp | 59 ++++++++++++++++++++++++++++++++
 src/adldap/samba/smb_context.h   | 52 ++++++++++++++++++++++++++++
 2 files changed, 111 insertions(+)
 create mode 100644 src/adldap/samba/smb_context.cpp
 create mode 100644 src/adldap/samba/smb_context.h

diff --git a/src/adldap/samba/smb_context.cpp b/src/adldap/samba/smb_context.cpp
new file mode 100644
index 00000000..77292ba8
--- /dev/null
+++ b/src/adldap/samba/smb_context.cpp
@@ -0,0 +1,59 @@
+/*
+ * ADMC - AD Management Center
+ *
+ * Copyright (C) 2020-2024 BaseALT Ltd.
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "smb_context.h"
+
+#include <libsmbclient.h>
+
+SMBContext::SMBContext() : smb_ctx_ptr(createContext(), freeContext) {
+    if (is_valid()) {
+        smbc_set_context(smb_ctx_ptr.get());
+    }
+}
+
+bool SMBContext::is_valid() const {
+    return bool(smb_ctx_ptr);
+}
+
+int SMBContext::smbcGetxattr(const char *fname, const char *name, const void *value, size_t size) {
+    return smbc_getFunctionGetxattr(smb_ctx_ptr.get())(smb_ctx_ptr.get(), fname, name, value, size);
+}
+
+SMBCCTX *SMBContext::createContext() {
+    SMBCCTX* newContext = smbc_new_context();
+
+    if (newContext) {
+        // smbc_setDebug(newContext, SMB_DEBUG_LEVEL);
+        smbc_setOptionUseKerberos(newContext, true);
+        smbc_setOptionFallbackAfterKerberos(newContext, true);
+
+        if (smbc_init_context(newContext) == nullptr) {
+            smbc_free_context(newContext, SMB_FREE_EVEN_IF_BUSY);
+            newContext = nullptr;
+        }
+    }
+
+    return newContext;
+}
+
+void SMBContext::freeContext(SMBCCTX *context) {
+    if (context) {
+        smbc_free_context(context, SMB_FREE_EVEN_IF_BUSY);
+    }
+}
diff --git a/src/adldap/samba/smb_context.h b/src/adldap/samba/smb_context.h
new file mode 100644
index 00000000..566d0b38
--- /dev/null
+++ b/src/adldap/samba/smb_context.h
@@ -0,0 +1,52 @@
+/*
+ * ADMC - AD Management Center
+ *
+ * Copyright (C) 2020-2024 BaseALT Ltd.
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef SMBCONTEXT_H
+#define SMBCONTEXT_H
+
+#include <memory>
+
+typedef struct _SMBCCTX SMBCCTX;
+
+const int SMB_FREE_EVEN_IF_BUSY = 1;
+const int SMB_DEBUG_LEVEL = 5;
+
+class SMBContext {
+public:
+    SMBContext();
+    ~SMBContext() = default;
+
+    SMBContext(const SMBContext&) = delete;
+    SMBContext& operator=(const SMBContext&) = delete;
+
+    SMBContext(SMBContext&&) = default;
+    SMBContext& operator=(SMBContext&&) = default;
+
+    bool is_valid() const;
+
+    int smbcGetxattr(const char *fname, const char *name, const void *value, size_t size);
+
+private:
+    SMBCCTX* createContext();
+    static void freeContext(SMBCCTX* context);
+
+    std::unique_ptr<SMBCCTX, decltype(&SMBContext::freeContext)> smb_ctx_ptr;
+};
+
+#endif // SMBCONTEXT_H