added: now we have a fourth part in permissions (guests)

e.g.: 07555 means:
           7 for owner
           5 for group
           5 for others
           5 for guests (not logged users)
added:     the sticky bit for directories
           e.g. permissions to a directory with a sticky bit set
           can be set to: 017555
rewritten: rm/mv winix functions to correctly understand the sticky bit
added:     Dir::FollowLink() recognizes ".." and "." now
           consequently System::FollowAllLinks recognizes it too
added:     umask -- calculating privileges for new files/directories
           all users have their own umask (in meta)
           and there is one in the config
           (for guests and when a user has not definied its own one)
removed:   mount option: only_root_remove



git-svn-id: svn://ttmath.org/publicrep/winix/trunk@801 e52654a7-88a9-db11-a3e9-0013d4bc506e

core/dirs.cpp

@@ -2,7 +2,7 @@
  * This file is a part of Winix
  * and is not publicly distributed
  * 
- * Copyright (c) 2008-2011, Tomasz Sowa
+ * Copyright (c) 2008-2012, Tomasz Sowa
  * All rights reserved.
  * 
  */
@@ -41,7 +41,7 @@ void Dirs::Clear()
 bool Dirs::HasReadExecAccessForRoot(const Item & item)
 {
 	// there must be at least one 'x' (for the root)
-	return (item.privileges & 01111) != 0; // !! in the future there'll be another 'x'
+	return (item.privileges & 01111) != 0;
 }
 
 
@@ -53,8 +53,8 @@ void Dirs::CheckRootDir()
 	{
 		if( !HasReadExecAccessForRoot(*i) )
 		{
-			i->privileges = 0755;
-			log << log1 << "Dirs: there is no access for root (admin) to the root dir, setting 0755 for root dir" << logend;
+			i->privileges = 07555;
+			log << log1 << "Dirs: there is no access for a root (admin) to the root dir, setting 07555 for the root directory" << logend;
 			db->EditPrivById(*i, i->id);
 		}
 
@@ -62,7 +62,7 @@ void Dirs::CheckRootDir()
 	}
 	
 		
-	log << log1 << "Dirs: there is no a root dir in the database (creating one)" << logend;
+	log << log1 << "Dirs: there is no a root directory in the database (creating one)" << logend;
 
 	Item root;
 
@@ -70,7 +70,7 @@ void Dirs::CheckRootDir()
 	root.parent_id    = -1;
 	root.user_id      = -1;
 	root.group_id     = -1;
-	root.privileges   = 0755;
+	root.privileges   = 07555;
 
 	// !! upewnic sie ze baza nie zmieni url (gdyby wczesniej juz byl w bazie pusty url)
 	// !! zrobic jakis wyjatek do wprowadzania roota?
@@ -487,7 +487,7 @@ return 0;
 
 
 
-// 	current_dir_tab can be the same container as out_dir_tab
+// current_dir_tab can be the same container as out_dir_tab
 void Dirs::CopyDirTab(const std::vector<Item*> & in, std::vector<Item*> & out)
 {
 	if( &in != &out )
@@ -502,13 +502,13 @@ void Dirs::CopyDirTab(const std::vector<Item*> & in, std::vector<Item*> & out)
 
 
 
-size_t Dirs::AnalyzeDir(std::vector<Item*> & dir_tab, const std::wstring & link_to)
+bool Dirs::AnalyzeDir(std::vector<Item*> & dir_tab, const std::wstring & link_to, size_t & i)
 {
-	if( dir_tab.empty() )
-		return 0;
-
-	size_t i = 0;
 	size_t old_i;
+	i = 0;
+
+	if( dir_tab.empty() )
+		return false;
 
 	while( true )
 	{	
@@ -516,7 +516,7 @@ size_t Dirs::AnalyzeDir(std::vector<Item*> & dir_tab, const std::wstring & link_
 		for( ; i<link_to.size() && link_to[i] == '/' ; ++i);
 
 		if( i == link_to.size() )
-			return i; // end of the path
+			return true; // end of the path
 
 		// creating a name
 		old_i = i;
@@ -525,12 +525,26 @@ size_t Dirs::AnalyzeDir(std::vector<Item*> & dir_tab, const std::wstring & link_
 		for( ; i<link_to.size() && link_to[i] != '/' ; ++i)
 			analyze_temp += link_to[i];
 		
- 		Item * pdir = GetDir(analyze_temp, dir_tab.back()->id);
- 			
- 		if( !pdir )
-			return old_i; // analyze_temp is not a directory
+		if( analyze_temp == L".." )
+		{
+			if( dir_tab.size() <= 1 )
+				return false;
 
-		dir_tab.push_back(pdir);
+			dir_tab.pop_back();
+		}
+		else
+		if( analyze_temp != L"." )
+		{
+ 			Item * pdir = GetDir(analyze_temp, dir_tab.back()->id);
+	 			
+ 			if( !pdir )
+			{
+				i = old_i;
+				return true; // analyze_temp is not a directory
+			}
+
+			dir_tab.push_back(pdir);
+		}
  	}
 }
 
@@ -541,7 +555,10 @@ size_t Dirs::AnalyzeDir(std::vector<Item*> & dir_tab, const std::wstring & link_
 
 int Dirs::FollowLink(std::vector<Item*> & dir_tab, const std::wstring & link_to, std::wstring & out_item)
 {
-	size_t i = AnalyzeDir(dir_tab, link_to);
+	size_t i;
+	
+	if( !AnalyzeDir(dir_tab, link_to, i) )
+		return 2; // incorrect link_to
 
 	if( i < link_to.size() )
 	{
@@ -574,7 +591,7 @@ return 0;
 	4 - current_dir_tab was empty
 
 	current_dir_tab can be the same container as out_dir_tab
-	link_to can be a relative path (without the first slash)
+	link_to can be a relative path (without the first slash) and can contain ".." or "."
 */
 int Dirs::FollowLink(const std::vector<Item*> & current_dir_tab, const std::wstring & link_to,
 					 std::vector<Item*> & out_dir_tab, std::wstring & out_item)
@@ -693,9 +710,9 @@ Item * Dirs::CreateVarDir()
 	if( root )
 	{
 		v.parent_id  = root->id;
-		v.user_id    = -1;
-		v.group_id   = -1;
-		v.privileges = 0755;
+		v.user_id    = root->user_id;
+		v.group_id   = root->group_id;
+		v.privileges = root->privileges;
 		v.subject    = L"var";
 		v.url        = L"var";
 		v.type       = Item::dir;