From b299f9d368773f1bbfd69494efc77196c7c4e1f6 Mon Sep 17 00:00:00 2001
From: Andrea Mazzoleni <amadvance@users.sourceforge.net>
Date: Thu, 25 Aug 2011 18:41:27 +0200
Subject: [PATCH] Uses the NOFOLLOW option in open() to ensure to do not follow
 symbolic links.

---
 handle.c | 10 ++++++----
 handle.h |  5 +++++
 mingw.h  |  4 ++++
 3 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/handle.c b/handle.c
index 072d5005..0d1e5f42 100644
--- a/handle.c
+++ b/handle.c
@@ -54,7 +54,7 @@ int handle_close_if_different(struct snapraid_handle* handle, struct snapraid_fi
 	return 0;
 }
 
-static int handle_ancestor(const char* file)
+int handle_ancestor(const char* file)
 {
 	char dir[PATH_MAX];
 	char* c;
@@ -111,12 +111,13 @@ int handle_create(struct snapraid_handle* handle, struct snapraid_file* file)
 	}
 
 	/* opening in sequential mode in Windows */
-	handle->f = open(handle->path, O_RDWR | O_CREAT | O_BINARY | O_SEQUENTIAL, 0600);
+	/* do not follow links to ensure to open the real file */
+	handle->f = open(handle->path, O_RDWR | O_CREAT | O_BINARY | O_SEQUENTIAL | O_NOFOLLOW, 0600);
 
 	/* if failed for missing permission */
 	if (handle->f == -1 && errno == EACCES) {
 		/* retry without requesting write permission */
-		handle->f = open(handle->path, O_RDONLY | O_BINARY | O_SEQUENTIAL);
+		handle->f = open(handle->path, O_RDONLY | O_BINARY | O_SEQUENTIAL | O_NOFOLLOW);
 	}
 
 	if (handle->f == -1) {
@@ -195,8 +196,9 @@ int handle_open(struct snapraid_handle* handle, struct snapraid_file* file)
 	}
 
 	/* opening in sequential mode in Windows */
+	/* do not follow links to ensure to open the real file */
 	pathprint(handle->path, sizeof(handle->path), "%s%s", handle->disk->dir, file->sub);
-	handle->f = open(handle->path, O_RDONLY | O_BINARY | O_SEQUENTIAL);
+	handle->f = open(handle->path, O_RDONLY | O_BINARY | O_SEQUENTIAL | O_NOFOLLOW);
 
 	if (handle->f == -1) {
 		/* invalidate for error */
diff --git a/handle.h b/handle.h
index 2d99d3dd..b3e6d41c 100644
--- a/handle.h
+++ b/handle.h
@@ -29,6 +29,11 @@ struct snapraid_handle {
 	struct stat st; /**< Stat info of the opened file. */
 };
 
+/**
+ * Creates all the required directories if missing.
+ */
+int handle_ancestor(const char* file);
+
 /**
  * Closes a file, if it's different from the specified one.
  */
diff --git a/mingw.h b/mingw.h
index 8457ba59..5b1a63c9 100644
--- a/mingw.h
+++ b/mingw.h
@@ -48,6 +48,10 @@
 #define opendir windows_opendir
 #define readdir windows_readdir
 #define closedir windows_closedir
+#define O_NOFOLLOW 0
+#define S_ISLNK(mode) 0
+#define readlink(a,b,c) -1
+#define symlink(a,b) -1
 
 /**
  * Generic stat information.