From 23d7402c006e58ee1bf1895db2f317f60f1b5b94 Mon Sep 17 00:00:00 2001
From: Klaus Schmidinger <vdr@tvdr.de>
Date: Sun, 12 Feb 2006 11:46:44 +0100
Subject: Now stopping scanning the video directory if there are too many
 levels of symbolic links

---
 CONTRIBUTORS |  2 ++
 HISTORY      |  3 +++
 recording.c  | 14 +++++++++++---
 recording.h  |  4 ++--
 4 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index 2a346191..d88e93f0 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -552,6 +552,8 @@ Helmut Auer <vdr@helmutauer.de>
  for separating the 'install' target into several individual targets
  for reporting a problem with scrolling with Up/Down in case there are non-selectable
  items at the beginning of the menu
+ for a patch that was used to implement stopping scanning the video directory if
+ there are too many levels of symbolic links
 
 Jeremy Hall <jhall@UU.NET>
  for fixing an incomplete initialization of the filter parameters in eit.c
diff --git a/HISTORY b/HISTORY
index 40058bd8..c20c8a32 100644
--- a/HISTORY
+++ b/HISTORY
@@ -4323,3 +4323,6 @@ Video Disk Recorder Revision History
   Skawina).
 - The "Back" key now restores the original string when pressed while editing a
   string item (suggested by Markus Hahn).
+- Now stopping scanning the video directory if there are too many levels of
+  symbolic links, which might indicate a recursive link loop (based on a patch
+  from Helmut Auer).
diff --git a/recording.c b/recording.c
index e7efba0b..67a92b0f 100644
--- a/recording.c
+++ b/recording.c
@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: recording.c 1.134 2006/02/05 12:34:08 kls Exp $
+ * $Id: recording.c 1.135 2006/02/12 11:34:19 kls Exp $
  */
 
 #include "recording.h"
@@ -58,6 +58,8 @@
 
 #define MAX_SUBTITLE_LENGTH  40
 
+#define MAX_LINK_LEVEL  6
+
 bool VfatFileSystem = false;
 
 cRecordings DeletedRecordings(true);
@@ -811,7 +813,7 @@ void cRecordings::Refresh(bool Foreground)
   ScanVideoDir(VideoDirectory, Foreground);
 }
 
-void cRecordings::ScanVideoDir(const char *DirName, bool Foreground)
+void cRecordings::ScanVideoDir(const char *DirName, bool Foreground, int LinkLevel)
 {
   cReadDir d(DirName);
   struct dirent *e;
@@ -821,7 +823,13 @@ void cRecordings::ScanVideoDir(const char *DirName, bool Foreground)
            asprintf(&buffer, "%s/%s", DirName, e->d_name);
            struct stat st;
            if (stat(buffer, &st) == 0) {
+              int Link = 0;
               if (S_ISLNK(st.st_mode)) {
+                 if (LinkLevel > MAX_LINK_LEVEL) {
+                    isyslog("max link level exceeded - not scanning %s", buffer);
+                    continue;
+                    }
+                 Link = 1;
                  char *old = buffer;
                  buffer = ReadLink(old);
                  free(old);
@@ -849,7 +857,7 @@ void cRecordings::ScanVideoDir(const char *DirName, bool Foreground)
                        delete r;
                     }
                  else
-                    ScanVideoDir(buffer, Foreground);
+                    ScanVideoDir(buffer, Foreground, LinkLevel + Link);
                  }
               }
            free(buffer);
diff --git a/recording.h b/recording.h
index 7eaddcc3..334e7469 100644
--- a/recording.h
+++ b/recording.h
@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: recording.h 1.49 2006/01/20 17:18:28 kls Exp $
+ * $Id: recording.h 1.50 2006/02/12 11:34:34 kls Exp $
  */
 
 #ifndef __RECORDING_H
@@ -104,7 +104,7 @@ private:
   int state;
   const char *UpdateFileName(void);
   void Refresh(bool Foreground = false);
-  void ScanVideoDir(const char *DirName, bool Foreground = false);
+  void ScanVideoDir(const char *DirName, bool Foreground = false, int LinkLevel = 0);
 protected:
   void Action(void);
 public:
-- 
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