Initial community commit

Src/external_dependencies/openmpt-trunk/include/unrar/extinfo.cpp

@@ -0,0 +1,178 @@
+#include "rar.hpp"
+
+#include "hardlinks.cpp"
+#include "win32stm.cpp"
+
+#ifdef _WIN_ALL
+#include "win32acl.cpp"
+#include "win32lnk.cpp"
+#endif
+
+#ifdef _UNIX
+#include "uowners.cpp"
+#ifdef SAVE_LINKS
+#include "ulinks.cpp"
+#endif
+#endif
+
+
+
+// RAR2 service header extra records.
+#ifndef SFX_MODULE
+void SetExtraInfo20(CommandData *Cmd,Archive &Arc,wchar *Name)
+{
+  if (Cmd->Test)
+    return;
+  switch(Arc.SubBlockHead.SubType)
+  {
+#ifdef _UNIX
+    case UO_HEAD:
+      if (Cmd->ProcessOwners)
+        ExtractUnixOwner20(Arc,Name);
+      break;
+#endif
+#ifdef _WIN_ALL
+    case NTACL_HEAD:
+      if (Cmd->ProcessOwners)
+        ExtractACL20(Arc,Name);
+      break;
+    case STREAM_HEAD:
+      ExtractStreams20(Arc,Name);
+      break;
+#endif
+  }
+}
+#endif
+
+
+// RAR3 and RAR5 service header extra records.
+void SetExtraInfo(CommandData *Cmd,Archive &Arc,wchar *Name)
+{
+#ifdef _UNIX
+  if (!Cmd->Test && Cmd->ProcessOwners && Arc.Format==RARFMT15 &&
+      Arc.SubHead.CmpName(SUBHEAD_TYPE_UOWNER))
+    ExtractUnixOwner30(Arc,Name);
+#endif
+#ifdef _WIN_ALL
+  if (!Cmd->Test && Cmd->ProcessOwners && Arc.SubHead.CmpName(SUBHEAD_TYPE_ACL))
+    ExtractACL(Arc,Name);
+  if (Arc.SubHead.CmpName(SUBHEAD_TYPE_STREAM))
+    ExtractStreams(Arc,Name,Cmd->Test);
+#endif
+}
+
+
+// Extra data stored directly in file header.
+void SetFileHeaderExtra(CommandData *Cmd,Archive &Arc,wchar *Name)
+{
+#ifdef _UNIX
+   if (Cmd->ProcessOwners && Arc.Format==RARFMT50 && Arc.FileHead.UnixOwnerSet)
+     SetUnixOwner(Arc,Name);
+#endif
+}
+
+
+
+
+// Calculate a number of path components except \. and \..
+static int CalcAllowedDepth(const wchar *Name)
+{
+  int AllowedDepth=0;
+  while (*Name!=0)
+  {
+    if (IsPathDiv(Name[0]) && Name[1]!=0 && !IsPathDiv(Name[1]))
+    {
+      bool Dot=Name[1]=='.' && (IsPathDiv(Name[2]) || Name[2]==0);
+      bool Dot2=Name[1]=='.' && Name[2]=='.' && (IsPathDiv(Name[3]) || Name[3]==0);
+      if (!Dot && !Dot2)
+        AllowedDepth++;
+    }
+    Name++;
+  }
+  return AllowedDepth;
+}
+
+
+// Check if all existing path components are directories and not links.
+static bool LinkInPath(const wchar *Name)
+{
+  wchar Path[NM];
+  if (wcslen(Name)>=ASIZE(Path))
+    return true;  // It should not be that long, skip.
+  wcsncpyz(Path,Name,ASIZE(Path));
+  for (wchar *s=Path+wcslen(Path)-1;s>Path;s--)
+    if (IsPathDiv(*s))
+    {
+      *s=0;
+      FindData FD;
+      if (FindFile::FastFind(Path,&FD,true) && (FD.IsLink || !FD.IsDir))
+        return true;
+    }
+  return false;
+}
+
+
+bool IsRelativeSymlinkSafe(CommandData *Cmd,const wchar *SrcName,const wchar *PrepSrcName,const wchar *TargetName)
+{
+  // Catch root dir based /path/file paths also as stuff like \\?\.
+  // Do not check PrepSrcName here, it can be root based if destination path
+  // is a root based.
+  if (IsFullRootPath(SrcName) || IsFullRootPath(TargetName))
+    return false;
+
+  // Number of ".." in link target.
+  int UpLevels=0;
+  for (int Pos=0;*TargetName!=0;Pos++)
+  {
+    bool Dot2=TargetName[0]=='.' && TargetName[1]=='.' && 
+              (IsPathDiv(TargetName[2]) || TargetName[2]==0) &&
+              (Pos==0 || IsPathDiv(*(TargetName-1)));
+    if (Dot2)
+      UpLevels++;
+    TargetName++;
+  }
+  // If link target includes "..", it must not have another links
+  // in the path, because they can bypass our safety check. For example,
+  // suppose we extracted "lnk1" -> "." first and "lnk1/lnk2" -> ".." next
+  // or "dir/lnk1" -> ".." first and "dir/lnk1/lnk2" -> ".." next.
+  if (UpLevels>0 && LinkInPath(PrepSrcName))
+    return false;
+    
+  // We could check just prepared src name, but for extra safety
+  // we check both original (as from archive header) and prepared
+  // (after applying the destination path and -ep switches) names.
+
+  int AllowedDepth=CalcAllowedDepth(SrcName); // Original name depth.
+
+  // Remove the destination path from prepared name if any. We should not
+  // count the destination path depth, because the link target must point
+  // inside of this path, not outside of it.
+  size_t ExtrPathLength=wcslen(Cmd->ExtrPath);
+  if (ExtrPathLength>0 && wcsncmp(PrepSrcName,Cmd->ExtrPath,ExtrPathLength)==0)
+  {
+    PrepSrcName+=ExtrPathLength;
+    while (IsPathDiv(*PrepSrcName))
+      PrepSrcName++;
+  }
+  int PrepAllowedDepth=CalcAllowedDepth(PrepSrcName);
+
+  return AllowedDepth>=UpLevels && PrepAllowedDepth>=UpLevels;
+}
+
+
+bool ExtractSymlink(CommandData *Cmd,ComprDataIO &DataIO,Archive &Arc,const wchar *LinkName)
+{
+#if defined(SAVE_LINKS) && defined(_UNIX)
+  // For RAR 3.x archives we process links even in test mode to skip link data.
+  if (Arc.Format==RARFMT15)
+    return ExtractUnixLink30(Cmd,DataIO,Arc,LinkName);
+  if (Arc.Format==RARFMT50)
+    return ExtractUnixLink50(Cmd,LinkName,&Arc.FileHead);
+#elif defined _WIN_ALL
+  // RAR 5.0 archives store link information in file header, so there is
+  // no need to additionally test it if we do not create a file.
+  if (Arc.Format==RARFMT50)
+    return CreateReparsePoint(Cmd,LinkName,&Arc.FileHead);
+#endif
+  return false;
+}