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dvdisaster/scsi-linux.c
TANIGUCHI Takaki a39ce4fddf Imported Upstream version 0.72
2009-11-21 16:29:02 +09:00

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7.7 KiB
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/* dvdisaster: Additional error correction for optical media.
* Copyright (C) 2004-2009 Carsten Gnoerlich.
* Project home page: http://www.dvdisaster.com
* Email: carsten@dvdisaster.com -or- cgnoerlich@fsfe.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA,
* or direct your browser at http://www.gnu.org.
*/
#include "dvdisaster.h"
#include "scsi-layer.h"
#include "udf.h"
/***
*** The Linux SCSI wrapper. Uses the uniform CDROM driver. Kernel 2.6.x recommended.
***/
#ifdef SYS_LINUX
#include <linux/param.h>
#include <scsi/sg.h>
char* DefaultDevice()
{ DeviceHandle *dh;
GDir *dir;
const char* dev;
int dev_type;
dir = g_dir_open("/dev", 0, NULL);
if(!dir)
{ PrintLog(_("Can not access /dev for devices\n"
"No drives will be pre-selected.\n"));
return g_strdup("/dev/cdrom");
}
dh = g_malloc(sizeof(DeviceHandle));
while((dev = g_dir_read_name(dir)))
{
if( (strlen(dev) == 3 && (!strncmp(dev,"hd",2) || !strncmp(dev,"sd",2) || !strncmp(dev,"sr", 2)))
|| (strlen(dev) == 4 && !strncmp(dev,"scd",3)) )
{ char buf[80];
sprintf(buf,"/dev/%s", dev);
memset(dh, 0, sizeof(DeviceHandle));
dh->fd = open(buf, O_RDWR | O_NONBLOCK);
dh->device = buf;
if(dh->fd < 0) /* device not even present */
continue;
dev_type = InquireDevice(dh, 1);
close(dh->fd);
if(dev_type != 5) /* not a CD/DVD ROM */
continue;
g_ptr_array_add(Closure->deviceNodes, g_strdup(buf));
sprintf(buf, "%s (/dev/%s)", dh->devinfo, dev);
g_ptr_array_add(Closure->deviceNames, g_strdup(buf));
}
}
g_dir_close(dir);
g_free(dh);
if(Closure->deviceNodes->len)
return g_strdup(g_ptr_array_index(Closure->deviceNodes, 0));
else
{ PrintLog(_("No CD/DVD drives found in /dev.\n"
"No drives will be pre-selected.\n"));
return g_strdup("/dev/cdrom");
}
}
DeviceHandle* OpenDevice(char *device)
{ DeviceHandle *dh;
dh = g_malloc0(sizeof(DeviceHandle));
dh->fd = open(device, O_RDWR | O_NONBLOCK);
if(dh->fd < 0)
{ g_free(dh);
Stop(_("Could not open %s: %s"),device, strerror(errno));
return NULL;
}
dh->device = g_strdup(device);
return dh;
}
void CloseDevice(DeviceHandle *dh)
{
if(dh->canReadDefective)
SetRawMode(dh, MODE_PAGE_UNSET);
if(dh->rawBuffer)
FreeRawBuffer(dh->rawBuffer);
if(dh->fd)
close(dh->fd);
if(dh->device)
g_free(dh->device);
if(dh->rs02Header)
g_free(dh->rs02Header);
if(dh->typeDescr)
g_free(dh->typeDescr);
if(dh->mediumDescr)
g_free(dh->mediumDescr);
if(dh->isoInfo)
FreeIsoInfo(dh->isoInfo);
if(dh->defects)
FreeBitmap(dh->defects);
g_free(dh);
}
//#define ASSERT_CDB_LENGTH
#ifdef ASSERT_CDB_LENGTH
static void assert_cdb_length(unsigned char cdb, int cdb_size, int expected_size)
{
if(cdb_size != expected_size)
PrintLog("SendPacket(): Wrong size %d for opcode %0x (expected %d)\n",
cdb_size, cdb, expected_size);
}
static void test_cdb(unsigned char *cdb, int cdb_size)
{
switch(cdb[0])
{ case 0x00: assert_cdb_length(cdb[0], cdb_size, 6); /* TEST UNIT READY */
break;
case 0x12: assert_cdb_length(cdb[0], cdb_size, 6); /* INQUIRY */
break;
case 0x1b: assert_cdb_length(cdb[0], cdb_size, 6); /* START STOP */
break;
case 0x1e: assert_cdb_length(cdb[0], cdb_size, 6); /* PREVENT ALLOW MEDIUM REMOVAL */
break;
case 0x23: assert_cdb_length(cdb[0], cdb_size, 10); /* READ FORMAT CAPACITIES */
break;
case 0x25: assert_cdb_length(cdb[0], cdb_size, 10); /* READ CAPACITY */
break;
case 0x28: assert_cdb_length(cdb[0], cdb_size, 10); /* READ(10) */
break;
case 0x43: assert_cdb_length(cdb[0], cdb_size, 10); /* READ TOC/PMA/ATIP */
break;
case 0x46: assert_cdb_length(cdb[0], cdb_size, 10); /* GET CONFIGURATION */
break;
case 0x51: assert_cdb_length(cdb[0], cdb_size, 10); /* READ DISC INFORMATION */
break;
case 0x52: assert_cdb_length(cdb[0], cdb_size, 10); /* READ TRACK INFORMATION */
break;
case 0x55: assert_cdb_length(cdb[0], cdb_size, 10); /* MODE SELECT */
break;
case 0x5a: assert_cdb_length(cdb[0], cdb_size, 10); /* MODE SENSE */
break;
case 0xad: assert_cdb_length(cdb[0], cdb_size, 12); /* READ DVD STRUCTURE */
break;
case 0xbe: assert_cdb_length(cdb[0], cdb_size, 12); /* READ CD */
break;
default:
PrintLog("SendPacket(): Unknown opcode %0x\n", cdb[0]);
}
}
#endif
/*
* The CDROM ioctl() interface has been used since the first dvdisaster
* release - it's the proven way of accessing the drive.
*/
static int send_packet_cdrom(DeviceHandle *dh, unsigned char *cmd, int cdb_size, unsigned char *buf, int size, Sense *sense, int data_mode)
{ struct cdrom_generic_command cgc;
#ifdef ASSERT_CDB_LENGTH
test_cdb(cmd, cdb_size);
#endif
memset(&cgc, 0, sizeof(cgc));
memcpy(cgc.cmd, cmd, MAX_CDB_SIZE); /* Linux ignores the CDB size */
cgc.buffer = buf;
cgc.buflen = size;
cgc.sense = (struct request_sense*)sense;
cgc.timeout = 10*60*HZ; /* 10 minutes; a timeout hangs newer kernels */
switch(data_mode)
{ case DATA_READ:
cgc.data_direction = CGC_DATA_READ;
break;
case DATA_WRITE:
cgc.data_direction = CGC_DATA_WRITE;
break;
default:
Stop("illegal data_mode: %d", data_mode);
}
return ioctl(dh->fd, CDROM_SEND_PACKET, &cgc);
}
/*
* Access to the drive through the generic SCSI interface
* has been added in dvdisaster 0.72 - it may have undetected flaws.
* Only use it if there are problems with the normal CDROM interface
* (some ancient parallel SCSI adapters/drives seem to fall into this
* category).
*/
static int send_packet_generic(DeviceHandle *dh, unsigned char *cmd, int cdb_size, unsigned char *buf, int size, Sense *sense, int data_mode)
{ struct sg_io_hdr sg_io;
memset(&sg_io, 0, sizeof(sg_io));
sg_io.interface_id = 'S';
switch(data_mode)
{ case DATA_READ:
sg_io.dxfer_direction = SG_DXFER_FROM_DEV;
break;
case DATA_WRITE:
sg_io.dxfer_direction = SG_DXFER_TO_DEV;
break;
default:
Stop("illegal data_mode: %d", data_mode);
}
sg_io.cmd_len = cdb_size;
sg_io.mx_sb_len = sizeof(Sense);
sg_io.dxfer_len = size;
sg_io.dxferp = buf;
sg_io.cmdp = cmd;
sg_io.sbp = (unsigned char*)sense;
sg_io.timeout = 10*60*1000;
sg_io.flags = SG_FLAG_LUN_INHIBIT|SG_FLAG_DIRECT_IO;
if(ioctl(dh->fd,SG_IO,&sg_io))
{ dh->sense.sense_key = 3; /* pseudo error indicating */
dh->sense.asc = 255; /* ioctl() failure */
dh->sense.ascq = 254;
return -1;
}
if(sg_io.status)
return -1;
#if 0
if ((sg_io.info&SG_INFO_OK_MASK) == SG_INFO_OK)
return 0;
#endif
return 0;
}
int SendPacket(DeviceHandle *dh, unsigned char *cmd, int cdb_size, unsigned char *buf, int size, Sense *sense, int data_mode)
{
if(!Closure->useSGioctl)
return send_packet_cdrom(dh, cmd, cdb_size, buf, size, sense, data_mode);
else return send_packet_generic(dh, cmd, cdb_size, buf, size, sense, data_mode);
}
#endif /* SYS_LINUX */
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