Add setSF() method to the bridge to allow brdiged protocols to disable

using sendfile() for an open file (nenecassry for https wgets).

src/XrdXrootd/XrdXrootdBridge.hh

@@ -171,6 +171,23 @@ virtual bool  Run(const char *xreqP,       //!< xrootd request header
 
 virtual bool  Disc() = 0;
 
+//-----------------------------------------------------------------------------
+//! Set file's sendfile capability.
+//!
+//! The setSF() method allows you to turn on or off the ability of an open
+//! file to be used with the sendfile() system call. This is useful when you
+//! must see the data prior to sending to the client (e.g. for encryption).
+//!
+//! @param  fhandle the filehandle as returned by kXR_open.
+//! @param  mode    When true, enables sendfile() otherwise it is disabled.
+//!
+//! @return =0      Sucessful.
+//! @return <0      Call failed. The return code is -errno and usually will
+//!                 indicate that the filehandle is not valid.
+//-----------------------------------------------------------------------------
+
+virtual int   setSF(kXR_char *fhandle, bool seton=false) = 0;
+
 //-----------------------------------------------------------------------------
 //! Set the maximum delay.
 //!

src/XrdXrootd/XrdXrootdProtocol.hh

@@ -207,6 +207,7 @@ XrdObject<XrdXrootdProtocol>         ProtLink;
 protected:
 
        void  MonAuth();
+       int   SetSF(kXR_char *fhandle, bool seton=false);
 
 static XrdXrootdXPath        RPList;    // Redirected paths
 static XrdXrootdXPath        RQList;    // Redirected paths for ENOENT

src/XrdXrootd/XrdXrootdTransit.hh

@@ -128,6 +128,13 @@ int           Send(int rcode, const struct iovec *ioVec, int ioNum, int ioLen);
 
 int           Send(long long offset, int dlen, int fdnum);
 
+//-----------------------------------------------------------------------------
+//! Set sendfile() enablement.
+//-----------------------------------------------------------------------------
+
+int           setSF(kXR_char *fhandle, bool seton=false)
+                   {return SetSF(fhandle, seton);}
+
 //-----------------------------------------------------------------------------
 //! Set maximum wait time.
 //-----------------------------------------------------------------------------

src/XrdXrootd/XrdXrootdXeq.cc

@@ -2750,6 +2750,27 @@ int XrdXrootdProtocol::rpEmsg(const char *op, char *fn)
    return Response.Send(kXR_NotAuthorized, buff);
 }
 
+/******************************************************************************/
+/*                                 S e t S F                                  */
+/******************************************************************************/
+
+int XrdXrootdProtocol::SetSF(kXR_char *fhandle, bool seton)
+{
+   XrdXrootdFHandle fh(fhandle);
+   XrdXrootdFile   *theFile;
+
+   if (!FTab || !(theFile = FTab->Get(fh.handle))) return -EBADF;
+
+// Turn it off or on if so wanted
+//
+   if (!seton) theFile->sfEnabled = 0;
+      else if (theFile->fdNum >= 0) theFile->sfEnabled = 1;
+
+// All done
+//
+   return 0;
+}
+
 /******************************************************************************/
 /*                                S q u a s h                                 */
 /******************************************************************************/