File indexing completed on 2025-03-23 04:28:11

 /*
     SPDX-FileCopyrightText: 2003-2009 Sebastian Trueg <trueg@k3b.org>
     SPDX-FileCopyrightText: 1998-2009 Sebastian Trueg <trueg@k3b.org>
 
     Parts of this file are inspired (and copied) from transport.hxx
     from the dvd+rw-tools (C) Andy Polyakov <appro@fy.chalmers.se>
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 
 #include "k3bscsicommand.h"
 #include "k3bdevice.h"
 
 #include <QDebug>
 
 #include <sys/ioctl.h>
 #undef __STRICT_ANSI__
 #include <linux/cdrom.h>
 #define __STRICT_ANSI__
 #include <scsi/sg.h>
 
 #include <unistd.h>
 #include <sys/types.h>
 #include <sys/utsname.h>
 
 
 #if !defined(SG_FLAG_LUN_INHIBIT)
 # if defined(SG_FLAG_UNUSED_LUN_INHIBIT)
 #  define SG_FLAG_LUN_INHIBIT SG_FLAG_UNUSED_LUN_INHIBIT
 # else
 #  define SG_FLAG_LUN_INHIBIT 0
 # endif
 #endif
 
 #ifdef SG_IO
 static bool useSgIo()
 {
     struct utsname buf;
     uname( &buf );
     // was CDROM_SEND_PACKET declared dead in 2.5?
     return ( strcmp( buf.release, "2.5.43" ) >=0 );
 }
 #endif
 
 
 class K3b::Device::ScsiCommand::Private
 {
 public:
     struct cdrom_generic_command cmd;
     struct request_sense sense;
 
 #ifdef SG_IO
     bool useSgIo;
     struct sg_io_hdr sgIo;
 #endif
 };
 
 
 void K3b::Device::ScsiCommand::clear()
 {
     ::memset( &d->cmd, 0, sizeof(struct cdrom_generic_command) );
     ::memset( &d->sense, 0, sizeof(struct request_sense) );
 
     d->cmd.quiet = 1;
     d->cmd.sense = &d->sense;
 
 #ifdef SG_IO
     d->useSgIo = useSgIo();
     ::memset( &d->sgIo, 0, sizeof(struct sg_io_hdr) );
 #endif
 }
 
 
 unsigned char& K3b::Device::ScsiCommand::operator[]( size_t i )
 {
 #ifdef SG_IO
     if( d->sgIo.cmd_len < i+1 )
         d->sgIo.cmd_len = i+1;
 #endif
     return d->cmd.cmd[i];
 }
 
 
 int K3b::Device::ScsiCommand::transport( TransportDirection dir,
                                          void* data,
                                          size_t len )
 {
     bool needToClose = false;
     int deviceHandle = -1;
     if( m_device ) {
         m_device->usageLock();
         if( !m_device->isOpen() ) {
             needToClose = true;
         }
         if ( !m_device->open( dir == TR_DIR_WRITE ) ) {
             m_device->usageUnlock();
             return -1;
         }
         deviceHandle = m_device->handle();
     }
 
     if( deviceHandle == -1 ) {
         return -1;
     }
 
     int i = -1;
 
 #ifdef SG_IO
     if( d->useSgIo ) {
         d->sgIo.interface_id= 'S';
         d->sgIo.mx_sb_len = sizeof( struct request_sense );
         d->sgIo.cmdp      = d->cmd.cmd;
         d->sgIo.sbp       = (unsigned char*)&d->sense;
         d->sgIo.flags     = SG_FLAG_LUN_INHIBIT|SG_FLAG_DIRECT_IO;
         d->sgIo.dxferp    = data;
         d->sgIo.dxfer_len = len;
         d->sgIo.timeout   = 5000;
         if( dir == TR_DIR_READ )
             d->sgIo.dxfer_direction = SG_DXFER_FROM_DEV;
         else if( dir == TR_DIR_WRITE )
             d->sgIo.dxfer_direction = SG_DXFER_TO_DEV;
         else
             d->sgIo.dxfer_direction = SG_DXFER_NONE;
 
         i = ::ioctl( deviceHandle, SG_IO, &d->sgIo );
 
         if( ( d->sgIo.info&SG_INFO_OK_MASK ) != SG_INFO_OK )
             i = -1;
     }
     else {
 #endif
         d->cmd.buffer = (unsigned char*)data;
         d->cmd.buflen = len;
         if( dir == TR_DIR_READ )
             d->cmd.data_direction = CGC_DATA_READ;
         else if( dir == TR_DIR_WRITE )
             d->cmd.data_direction = CGC_DATA_WRITE;
         else
             d->cmd.data_direction = CGC_DATA_NONE;
 
         i = ::ioctl( deviceHandle, CDROM_SEND_PACKET, &d->cmd );
 #ifdef SG_IO
     }
 #endif
 
     if( needToClose )
         m_device->close();
 
     if ( m_device ) {
         m_device->usageUnlock();
     }
 
     if( i ) {
         debugError( d->cmd.cmd[0],
                     d->sense.error_code,
                     d->sense.sense_key,
                     d->sense.asc,
                     d->sense.ascq );
 
         int errCode =
             ((d->sense.error_code<<24) & 0xF000) |
             ((d->sense.sense_key<<16)  & 0x0F00) |
             ((d->sense.asc<<8)         & 0x00F0) |
             ((d->sense.ascq)           & 0x000F);
 
         return( errCode != 0 ? errCode : 1 );
     }
     else
         return 0;
 }