u3-tool/debian/patches/combined-r59.patch

Subject: All upstream commits until r59 combined
Author: Daviedev <daviedev@users.sourceforge.net>
Forwarded: not-needed

--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,13 @@
-0.3:
+1.0 Daniel J Blueman <daniel@quora.org>
+ - Fix behaviour with newer U3 devices
+ - Printing fixes
+ - Detach mass-storage prior to USB access
+ - Gracefully quit with Ctrl-C
+ - Print data partition size when too small
+ - Limit update printing rate
+ - Fix linking to libusb; recommended over SG
+
+0.3
  - Detect correct subsystem from configure.
  - Use MinGW/MSYS to build on MS Windows
  - Hide password input under MS Windows
--- a/TODO
+++ b/TODO
@@ -1,6 +1,5 @@
 Major:
  - If possible open sg subsystem Read-only to work around NOMEDIUM error with encrypted partition
- - Handle ctrl-c
  - Documentation
  - Further documentation of U3 features
  - Document which options are destructive
--- a/configure.ac
+++ b/configure.ac
@@ -37,11 +37,11 @@
 
 # Checks for libraries.
 #FIXME: PKG_CHECK_MODULES not provided on MinGW
-#AS_IF([ test x$subsystem = xlibusb ],
-#	[ PKG_CHECK_MODULES([LIBUSB], [libusb],
-#		[  ],
-#		[ AC_MSG_FAILURE([libusb is required but not found.]) ])
-#	])
+AS_IF([ test x$subsystem = xlibusb ],
+	[ PKG_CHECK_MODULES([LIBUSB], [libusb],
+		[  ],
+		[ AC_MSG_FAILURE([libusb is required but not found.]) ])
+	])
 
 # Checks for header files.
 AC_HEADER_STDC
--- /dev/null
+++ b/doc/commands.txt
@@ -0,0 +1,579 @@
+
+---
+
+>> 0x00
+description:
+ Read a page with some sort of device info
+
+type: request
+
+command:
+
+ CBWCB = 0xFF 0x00 0x00 0x03 0x00 0x27 0x00 0x00 0x00 0x00 0x00 0x00
+
+ byte	data		description
+ ------------------------------------------------------------------------------
+ 0	0xFF		SCSI opcode
+ 1-2	0x0000		command
+ 3-4	0x0003		Page number
+ 5-6	0x27		Request data length
+ 9	0x0		??? sofware update tool also uses 0x01 here
+
+ valid page numbers according to bCSWStatus:
+  verbatime: 0x3, 0x4, 0x6, 0x8, 0xa, 0xc, 0xe, 0x13, 0x14
+
+data:
+ 6+ bytes
+
+ 0000  03 00 01 00 27 00                                 |....'.          |
+
+ byte	data		description
+ ------------------------------------------------------------------------------
+ 0-1	0x0003		page number
+ 2-3	0x0001		??? mostly 0x01, once 0x03
+ 4-5	0x0027		total usefull data length (including 6 byte header)
+
+
+page 0x03:
+
+ 0000  03 00 01 00 27 00 77 00  00 00 03 81 07 06 54 30  |....'.w.......T0|
+ 0016  30 30 30 31 31 41 31 41  41 31 31 41 41 41 31 81  |00011A1AA11AAA1.|
+ 0032  07 06 54 91 4e 0f 00                              |..T.N..|
+
+ byte	data		description
+ ------------------------------------------------------------------------------
+ 0-5			header(see above)
+ 6			Real size of full record...????
+ 7-11			??? same for both verbatime and sandisk
+ 11-14	0x54060781	??? same as @ byte 31 (actual value different on verbatim)
+ 15-30	"000011A1AA11AAA1"	Serial number
+ 31-34	0x54060781	??? same as @ byte 11
+ 35-38	0x000f4e91	Device size in 512-byte blocks
+
+page 0x0c:
+
+ 0000  0c 00 01 00 0a 00 10 27  00 00                    |.......'..      |
+
+ byte	data		description
+ ------------------------------------------------------------------------------
+ 0-5			header(see above)
+ 6-9	0x00002710	Maximum wrong password try for secure zone.
+
+---
+
+>> 0x20
+description:
+ Round CD size to a value the device likes
+
+type: action
+
+command:
+ CBWCB = 0xFF 0x20 0x00 0x02 0xFF 0x03 0x00 0x00 0x00 0x00 0x00 0x00
+
+ byte	data		description
+ ------------------------------------------------------------------------------
+ 0	0xFF		scsi opcode
+ 1-2	0x0020		command
+ 3	0x02		??? can atleast be 0x02 and 0x03 but not 0, 1, 4, is
+			this some sort of domain id to select the partition,
+			like in 0x21, byte 3??? the verbatim is less picky and
+			accepts all values...
+ 4-7	0x3FF		Value to round (in 512-byte sectors)
+ 8	0x0		Direction to round(0x00 = down, 0x01 = up)
+
+data:
+ 4 bytes
+
+ 0000  00 02 00 00                                      |....|
+
+ byte	data		description
+ ------------------------------------------------------------------------------
+ 0-3	0x200		Rounded value
+
+---
+
+>> 0x21
+description:
+ get information about the partition configuration
+
+type: request
+
+command:
+ CBWCB = 0xFF 0x21 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
+
+ byte	data		description
+ ------------------------------------------------------------------------------
+
+data:
+
+ 0000  02 02 00 00 00 91 1e 0f  00 03 01 00 00 00 30 00  |..............0.|
+ can be read in any multiple of 8 all dat beyond the above data is zero(0)
+
+ u3-remover uses the following data(IIRC), (0x0f4e91 == full drive size):
+ 0000  01 02 00 00 00 91 4e 0f  00                       |.........       |
+
+
+ byte	data		description
+ ------------------------------------------------------------------------------
+ 0	02		amount of available records, where 1 record = 8 byte???
+ 1	02		??? some sort of domain id???
+ 3-4	00 00 00	??
+ 5-8	0x000F1E91	size of data partition in 512-byte sectors
+ 9	0x03		?? some sort of domain id????
+ 10	0x01		?? WARNING: If set to 0 on Sandisk cruzer, cd drive
+			will show up as direct-access, but can't be used, also
+			drive doesn't react to command 0x00, page 3 and you
+			won't be able to re-partition device!!!!
+ 11-12	00 00		??
+ 13-15	0x003000	size of cdrom partitoin in 512-byte sectors
+
+---
+
+>> 0x22
+description:
+ Repartition device
+
+type: action
+
+command:
+ CBWCB = 0xFF 0x22 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
+
+ byte	data		description
+ ------------------------------------------------------------------------------
+
+data:
+ 0000  02 02 00 00 00 91 1e 0f  00 03 01 00  00 00 30 00 |..............0.|
+ 0016  00                                                |.               |
+
+
+ byte	data		description
+ ------------------------------------------------------------------------------
+ 0	0x02		amount of dword of data(+1byte+1dword=packet_size)
+ 1-4	0x00000002	???
+ 5-8	0x000f1e91	Size of data partition in 512-byte sectors
+ 9-12	0x00000103	??? 0x0003 make's it a direct access partition.(but can't partition afterwards, and page 3 of command 0x0000 isn't accessible anymore...)
+ 13-16	0x00003000	Size of CD partition in 512-byte sectors
+
+---
+
+>> 0x42
+description:
+ Write block of data to CD-rom partition
+
+type: action
+
+command:
+ CBWCB = 0xFF 0x42 0x00 0x01 0x00 0x00 0x01 0x1D 0x00 0x00 0x00 0x01 
+
+ byte	data		description
+ ------------------------------------------------------------------------------
+ 0	0xFF		scsi opcode
+ 1-2	0x42		command
+ 3	0x01		???
+ 4-7	0x0000011D	Block Address (Big Endian!!!!!!!)
+ 8-11	0x01		??? (Big Endian?)
+
+data:
+ A 2048 byte block
+
+---
+
+>> 0x61
+description:
+ read out hidden data/config storage. Looks the same as with mDrive.
+
+type: request
+
+command:
+ CBWCB = 0xFF 0x61 0x00 0x01 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
+
+ byte	data		description
+ ------------------------------------------------------------------------------
+
+data:
+
+
+ byte	data		description
+ ------------------------------------------------------------------------------
+
+---
+
+>> 0x63
+description:
+ read out hidden data/config storage. Looks the similar as with mDrive.
+
+type: request
+
+command:
+ CBWCB = 0xFF 0x63 0x00 0x00 0x00 0x55 0x33 0x49 0x4E 0x50 0x52 0x50
+
+ byte	data		description
+ ------------------------------------------------------------------------------
+
+data:
+
+
+ byte	data		description
+ ------------------------------------------------------------------------------
+
+---
+
+>> 0xA0
+description:
+ get some sort of data partition information
+
+type: request
+
+command:
+
+ CBWCB = 0xFF 0xA0 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
+
+ byte	data		description
+ ------------------------------------------------------------------------------
+
+data:
+ 16 byte
+
+ 0000  40 ab 1d 00 00 00 00 00  00 00 00 00 00 00 00 00  |@...............|
+
+ 0000  40 ab 1d 00 40 ab 1d 00  01 00 00 00 00 00 00 00  |@...@...........| (secured)
+
+
+ byte	data		description
+ ------------------------------------------------------------------------------
+ 0-3	0x001dab40	Total data partition size
+ 4-7	0x001dab40	Amount of data partition encrypted????
+ 8-11	0x00000001	Lock(=0) or Unlocked(=1)
+ 12-15	0x00000000	Wrong password try counter
+
+---
+
+>> 0xA1
+description:
+ FUZED
+
+type: Request?
+
+command:
+
+ CBWCB = 0xFF 0xA1 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
+
+ byte	data		description
+ ------------------------------------------------------------------------------
+ 0			scsi opcode
+ 1-2			command
+ 3	0		Failes on Sandisk if != 0
+ 4-			changing these doesn't seem to have any effect
+
+data:
+
+ data is random, and changes due to executing commands
+
+ byte	data		description
+ ------------------------------------------------------------------------------
+
+
+---
+
+>> 0xA2
+description:
+ Secure data partition
+
+ Password hash is a md5 sum of the unicode password including the terminating
+ null. So for a password of 'a' the following byte stream is fead to the md5
+ function: 0x61 0x00 0x00 0x00 == UNICODE "a\0"
+
+ It seems that if the whole of the data partition is made secure zone, then
+ the data currently on the data partition is accessible in the secure zone.
+ If only a part of the data partition is made secure zone than the first part
+ of the data on the partition is retained and the rest isn't accessible. In
+ this case the secure zone will contain garbage(the data on that was on that
+ part of the data partition but decrypted with an other key).
+
+ If the device is already secured and this command is issued again, the current
+ data on the device is lost(if secure zone == 100%).
+
+type: action
+
+command:
+
+ CBWCB = 0xFF 0xA2 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
+
+ byte	data		description
+ ------------------------------------------------------------------------------
+
+data:
+ 20 byte
+
+ 0000  40 ab 1d 00 33 2c e7 85  e9 73 57 4a 1c 5f da f3  |@...3,...sWJ._..|
+ 0016  ee e3 f0 83                                       |....|
+
+
+ byte	data		description
+ ------------------------------------------------------------------------------
+ 0-3	0x001dab40	Size of private zone????
+ 4-19	...		Password hash ( pass='a')
+
+
+---
+
+>> 0xA3
+description:
+ value rounding for data partition securing
+
+type: request
+
+command:
+ CBWCB = 0xFF 0xA3 0x00 0x00 0x40 0xAB 0x1D 0x00 0x01 0x00 0x00 0x00
+
+ byte	data		description
+ ------------------------------------------------------------------------------
+ 0	0xFF		scsi opcode
+ 1-2	0x00A3		Command
+ 3	0x00		???
+ 4-7	0x001DAB40	Value to round (in 512-byte sectors)
+ 8	0x01		Direction to round(0x00 = down, 0x01 = up)
+ 
+
+data:
+ 4 byte
+
+ 0000  40 ab 1d 00                                      |@...|
+
+ byte	data		description
+ ------------------------------------------------------------------------------
+ 0-3	0x001DAB40	Rounded value
+
+---
+
+>> 0xA4
+description:
+ unlock device
+
+ Password hash is a md5 sum of the unicode password including the terminating
+ null. So for a password of 'a' the following byte stream is fead to the md5
+ function: 0x61 0x00 0x00 0x00 == UNICODE "a\0"
+
+type: action
+
+command:
+
+ CBWCB = 0xFF 0xA4 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
+
+ byte	data		description
+ ------------------------------------------------------------------------------
+
+data:
+ 16 byte
+
+ 0000  33 2c e7 85 e9 73 57 4a  1c 5f da f3 ee e3 f0 83  |3,...sWJ._......|
+
+ byte	data		description
+ ------------------------------------------------------------------------------
+ 0-15	...		password hash (pass='a')
+
+---
+
+>> 0xA6
+description:
+ change password
+
+ Password hash is a md5 sum of the unicode password including the terminating
+ null. So for a password of 'a' the following byte stream is fead to the md5
+ function: 0x61 0x00 0x00 0x00 == UNICODE "a\0"
+
+type: action
+
+command:
+
+ CBWCB = 0xFF 0xA6 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
+
+ byte	data		description
+ ------------------------------------------------------------------------------
+
+data:
+
+ 0000  33 2c e7 85 e9 73 57 4a  1c 5f da f3 ee e3 f0 83  |3,...sWJ._......|
+ 0016  c0 51 c1 bb 98 b7 1c cb  15 b0 cf 9c 67 d1 43 ee  |.Q..........g.C.|
+
+ byte	data		description
+ ------------------------------------------------------------------------------
+ 0-15	...		Old password hash ( pass='a')
+ 16-31	...		New password hash ( pass='b')
+
+---
+
+>> 0xA7
+description:
+ Remove security
+
+ Password hash is a md5 sum of the unicode password including the terminating
+ null. So for a password of 'a' the following byte stream is fead to the md5
+ function: 0x61 0x00 0x00 0x00 == UNICODE "a\0"
+
+ hmm... if security zone size != size of data partition, then this fails!!!
+ it returns a failed status but doesn't increase the password try counter,
+ even if password was incorrect.... to remove the secure zone if it doesn't
+ fully occupy the data partition, recreate the secure zone with maximum size.
+ > Possible cause: If this command is issued the secure zone becomes the public
+ zone, and thus all data on the disk will be retained. It is suspected that all
+ partitions/zones are stored encrypted on the flash device(Yes, even the public
+ zone). So, if this command is issued the secure zone key is decrypted(if
+ encrypted at all) and the zone is marked as public. Logically this would not
+ work if there is a public and secure zone. Then you would end up with two
+ public zone's with different encryptions keys.
+
+ Byte 3 of command does something... but still doesn't allow for removing half
+ secure zones.
+
+type: action
+
+command:
+
+ CBWCB = 0xFF 0xA7 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
+
+ byte	data		description
+ ------------------------------------------------------------------------------
+
+data:
+
+ 0000  c0 51 c1 bb 98 b7 1c cb  15 b0 cf 9c 67 d1 43 ee  |.Q..........g.C.|
+
+ byte	data		description
+ ------------------------------------------------------------------------------
+ 0-15	...		Password hash (in this case 'b')
+
+---
+
+>> 0x100
+description:
+ seen used after a 0xA4(with some normal scsi stuff in between...).
+ generate reset some sort of reset or insert condition on data disk. Linux old 2.4
+ usb-storage sees it as a disconnect of the drive.
+
+type: 
+
+command:
+
+ CBWCB = 0xFF 0x00 0x01 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
+
+ byte	data		description
+ ------------------------------------------------------------------------------
+
+data:
+ No data....
+
+
+---
+
+>> 0x101
+description:
+ disconnect's and possibly reconnects device
+
+type: action
+
+command:
+
+ CBWCB = 0xFF 0x01 0x01 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
+
+ byte	data		description
+ ------------------------------------------------------------------------------
+
+data:
+  12 bytes
+
+  0000  50 00 00 00 40 9c 00 00  01 00 00 00              |P...@.......|
+
+ byte	data		description
+ ------------------------------------------------------------------------------
+ 8	0x01		If 1 reconnect after disconnect, else not
+ all other byte's dont seem to have any effect...
+
+---
+
+>> 0x103
+description:
+Get chip maker and version
+
+type: request
+
+command:
+
+ CBWCB = 0xFF 0x03 0x01 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
+
+ byte	data		description
+ ------------------------------------------------------------------------------
+
+data:
+ 24 bytes
+
+ 0000  33 2e 32 31 00 00 00 00  53 61 6e 44 69 73 6b 20  |3.21....SanDisk |
+ 0016  00 00 00 00 00 00 00 00                           |........|
+
+ byte	data		description
+ ------------------------------------------------------------------------------
+ 0-7	"3.21"		Chip version
+ 8-23	"SanDisk"	Chip maker
+
+
+
+
+
+
+
+possible read commands:
+0x20
+0x21
+0x61
+0x63
+0x68
+0x6b 512?
+0x81 128-byte
+0x84 64-byte
+0x85 64-byte
+0x88 64-byte
+0xa1 4-byte
+0xc1
+0xe2 = read random?, 64-byte
+
+0x102 512-byte
+
+Write:
+0x01 -> 0x1f
+0x22 -> 0x40
+0x42
+0x60
+0x62
+0x6a
+0x6c
+0x6d
+0x6e
+0x82 128 byte
+0x83 64 byte?
+0x86
+0x87
+0xc0
+0xc2
+
+
+
+
+---
+
+>>
+description:
+
+type: 
+
+command:
+
+ byte	data		description
+ ------------------------------------------------------------------------------
+
+data:
+
+
+ byte	data		description
+ ------------------------------------------------------------------------------
+
+
--- a/src/display_progress.c
+++ b/src/display_progress.c
@@ -20,17 +20,18 @@
 #include <stdio.h>
 
 void display_progress(unsigned int cur, unsigned int total) {
-        unsigned int procent;
-	unsigned int bar_len;
-	int i;
+	static unsigned int last = 0;
+	unsigned int percent;
+	unsigned int bar_len, i;
 
 	if (total == 0) return;
 
-	procent = (cur * 100) / total;
+	percent = (cur * 100) / total;
+	if (percent == last) return;
 
 	putchar('|');
 	bar_len = (cur * PROGRESS_BAR_WIDTH) / total;
-	for (i =0; i < bar_len; i++) {
+	for (i = 0; i < bar_len; i++) {
 		putchar('*');
 	}
 	for (i = bar_len; i < PROGRESS_BAR_WIDTH; i++) {
@@ -38,6 +39,8 @@
 	}
 	putchar('|');
 
-	printf(" %d%%\r", procent);
+	printf(" %d%%\r", percent);
 	fflush(stdout);
+
+	last = percent;
 }
--- a/src/main.c
+++ b/src/main.c
@@ -24,6 +24,8 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include <signal.h>
+#include <assert.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 
@@ -42,10 +44,11 @@
 #define MAX_FILENAME_STRING_LENGTH 1024
 #define MAX_PASSWORD_LENGTH 1024
 
-char *version = VERSION;
+static char *version = VERSION;
 
 int debug = 0;
-int batch_mode = 0;
+static int batch_mode = 0;
+static int quit = 0;
 
 enum action_t { unknown, load, partition, dump, info, unlock, change_password,
 		enable_security, disable_security, reset_security };
@@ -57,7 +60,7 @@
  *
  * @returns	TRUE if user wants to continue else FALSE to abort.
  */
-int confirm() {
+static int confirm(void) {
 	char c;
 	int retval;
 	int done;
@@ -93,24 +96,24 @@
 /**
  * Symbols of size multiplication factors.
  */
-char factor_symbols[] = "kMGTPE";
+static char factor_symbols[] = " kMGTPE";
 
 /**
  * Print bytes is human readable fashion.
  *
  * @param size	Data size to print
  */
-void print_human_size(uint64_t size) {
-	float fsize = 0;
+static void print_human_size(uint64_t size) {
+	double fsize = 0;
 	unsigned int factor = 0;
 	
 	fsize = size;
-	while (fsize > 1024) {
+	while (fsize >= 1024) {
 		fsize /= 1024;
 		factor++;
 	}
 
-	printf("%.2f %cB", fsize, factor_symbols[factor-1]);
+	printf("%.2f %cB", fsize, factor_symbols[factor]);
 }
 
 /**
@@ -122,7 +125,7 @@
  * @returns		U3_SUCCESS if successful, else U3_FAILURE and
  * 			an error string can be obtained using u3_error()
  */
-int get_tries_left(u3_handle_t *device, int *tries) {
+static int get_tries_left(u3_handle_t *device, int *tries) {
 	struct dpart_info dpinfo;
 	struct property_0C security_properties;
 
@@ -151,10 +154,10 @@
 
 /********************************** Actions ***********************************/
 
-int do_load(u3_handle_t *device, char *iso_filename) {
+static int do_load(u3_handle_t *device, char *iso_filename) {
 	struct stat file_stat;
 	struct part_info pinfo;
-	uint32_t cd_size;
+	off_t cd_size;
 	FILE *fp;
 	uint8_t	buffer[U3_BLOCK_SIZE];
 	unsigned int bytes_read=0;
@@ -171,10 +174,10 @@
 		return EXIT_FAILURE;
 	}
 
-	cd_size = file_stat.st_size / U3_SECTOR_SIZE;
+	cd_size = ((uintmax_t) file_stat.st_size) / U3_SECTOR_SIZE;
 	if (file_stat.st_size % U3_SECTOR_SIZE)
 		cd_size++;
-	block_cnt = file_stat.st_size / U3_BLOCK_SIZE;
+	block_cnt = ((uintmax_t) file_stat.st_size) / U3_BLOCK_SIZE;
 	if (file_stat.st_size % U3_BLOCK_SIZE)
 		block_cnt++;
 
@@ -186,10 +189,10 @@
 	}
 
 	if (cd_size > pinfo.cd_size) {
-		fprintf(stderr, "CD image(%lu byte) is to big for current cd "
-			"partition(%u byte), please repartition device.\n",
-			file_stat.st_size,
-			U3_SECTOR_SIZE * pinfo.cd_size);
+		fprintf(stderr, "CD image (%ju bytes) is to big for current CD "
+			"partition (%llu bytes)\n",
+			(uintmax_t) file_stat.st_size,
+			1ll * U3_SECTOR_SIZE * pinfo.cd_size);
 		return EXIT_FAILURE;
 	}
 
@@ -228,7 +231,7 @@
 		}
 
 		block_num++;
-	} while (!feof(fp));
+	} while (!feof(fp) && !quit);
 	display_progress(block_num, block_cnt);
 	putchar('\n');
 
@@ -238,7 +241,7 @@
 	return EXIT_SUCCESS;
 }
 
-int do_partition(u3_handle_t *device, char *size_string) {
+static int do_partition(u3_handle_t *device, char *size_string) {
 	uint64_t size;
 	uint32_t cd_sectors;
 
@@ -263,7 +266,7 @@
 	return EXIT_SUCCESS;
 }
 
-int do_unlock(u3_handle_t *device, char *password) {
+static int do_unlock(u3_handle_t *device, char *password) {
 	int result=0;
 	int tries_left=0;
 
@@ -297,7 +300,7 @@
 	}
 }
 
-int do_change_password(u3_handle_t *device, char *password,
+static int do_change_password(u3_handle_t *device, char *password,
 	char *new_password)
 {
 	int result=0;
@@ -335,7 +338,7 @@
 	}
 }
 
-int do_enable_security(u3_handle_t *device, char *password) {
+static int do_enable_security(u3_handle_t *device, char *password) {
 	if (u3_enable_security(device, password) != U3_SUCCESS) {
 		fprintf(stderr, "u3_enable_security() failed: %s\n",
 			u3_error_msg(device));
@@ -345,7 +348,7 @@
 	return EXIT_SUCCESS;
 }
 
-int do_disable_security(u3_handle_t *device, char *password) {
+static int do_disable_security(u3_handle_t *device, char *password) {
 	int result=0;
 	int tries_left=0;
 
@@ -380,7 +383,7 @@
 	}
 }
 
-int do_reset_security(u3_handle_t *device) {
+static int do_reset_security(u3_handle_t *device) {
 	int result=0;
 
 	// the enable security command is always possible without the correct
@@ -408,7 +411,7 @@
 	}
 }
 
-int do_info(u3_handle_t *device) {
+static int do_info(u3_handle_t *device) {
 	struct part_info pinfo;
 	struct dpart_info dpinfo;
 	struct chip_info cinfo;
@@ -484,8 +487,8 @@
 	return EXIT_SUCCESS;
 }
 
-int do_dump(u3_handle_t *device) {
-	int retval = EXIT_SUCCESS;
+static int do_dump(u3_handle_t *device) {
+	int retval;
 
 	struct part_info pinfo;
 	struct dpart_info dpinfo;
@@ -595,12 +598,12 @@
 		}
 	}
 
-	return EXIT_SUCCESS;
+	return retval;
 }
 
 /************************************ Main ************************************/
 
-void usage(const char *name) {
+static void usage(const char *name) {
 	printf("u3-tool %s - U3 USB stick manager\n", version);
 	printf("\n");
 	printf("Usage: %s [options] <device name>\n", name);
@@ -622,7 +625,7 @@
 	printf("For the device name use:\n  %s\n", u3_subsystem_help);
 }
 
-void print_version() {
+static void print_version(void) {
 	printf("u3-tool %s\n", version);
 	printf("subsystem: %s\n", u3_subsystem_name);
 	printf("\n");
@@ -632,6 +635,10 @@
 		"MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\n");
 }
 
+static void set_quit(int sig) {
+	quit = 1;
+}
+
 int main(int argc, char *argv[]) {
 	u3_handle_t device;
 
@@ -711,6 +718,9 @@
 	}
 	device_name = argv[optind];
 
+	assert(signal(SIGINT, set_quit) != SIG_ERR);
+	assert(signal(SIGTERM, set_quit) != SIG_ERR);
+
 	//
 	// open the device
 	// 
@@ -772,9 +782,9 @@
 		case partition:
 			printf("\n");
 			printf("WARNING: Loading a new cd image causes the ");
-			printf("whole device to be whiped. This INCLUDES\n ");
+			printf("whole device to be wiped. This INCLUDES\n ");
 			printf("the data partition.\n");
-			printf("I repeat: ANY EXCISTING DATA WILL BE LOST!\n");
+			printf("I repeat: ANY EXISTING DATA WILL BE LOST!\n");
 			if (confirm())
 				retval = do_partition(&device, size_string);
 			break;
--- a/src/secure_input.c
+++ b/src/secure_input.c
@@ -33,9 +33,9 @@
 	DWORD mode;
 	HANDLE ih;
 #else
-	struct termio ttymode;
+	struct termios ttymode;
 #endif
-	int pos;
+	size_t pos;
 	int ch;
 
 	// input checking
@@ -51,9 +51,9 @@
 	}
 	SetConsoleMode(ih, mode & ~(ENABLE_ECHO_INPUT ));
 #else
-	ioctl(STDIN_FILENO, TCGETA, &ttymode);
+	tcgetattr(STDIN_FILENO, &ttymode);
 	ttymode.c_lflag &= ~( ECHO | ECHOE | ECHONL );
-	ioctl(STDIN_FILENO, TCSETAF, &ttymode);
+	tcsetattr(STDIN_FILENO, TCSAFLUSH, &ttymode);
 #endif
 
 	pos=0;
@@ -75,7 +75,7 @@
 	fputc('\n', stdout);
 #else
 	ttymode.c_lflag |= ECHO | ECHOE | ECHONL;
-	ioctl(STDIN_FILENO, TCSETAF, &ttymode);
+	tcsetattr(STDIN_FILENO, TCSAFLUSH, &ttymode);
 	fputc('\n', stdout);
 #endif
 }
--- a/src/u3_commands.c
+++ b/src/u3_commands.c
@@ -52,10 +52,9 @@
  * 		U3_PASSWORD_HASH_LEN long.
  */
 void u3_pass_to_hash(const char *password, uint8_t *hash) {
-	unsigned int passlen;
+	unsigned int passlen, i;
 	unsigned int unicode_passlen;
 	uint8_t *unicode_pass;
-	int i;
 
 	passlen = strlen(password);
 	unicode_passlen = (passlen+1)*2;
@@ -178,7 +177,7 @@
 		return U3_FAILURE;
 	}
 	if (cd_size > device_properties.device_size) {
-		u3_set_error(device, "Requested CD size is to big for device");
+		u3_set_error(device, "Requested CD size is larger than device (%ull bytes)", device_properties.device_size << 9ULL);
 		return U3_FAILURE;
 	}
 
--- /dev/null
+++ b/src/u3_scsi_debug.c
@@ -0,0 +1,111 @@
+/**
+ * u3-tool - U3 USB stick manager
+ * Copyright (C) 2007 Daviedev, daviedev@users.sourceforge.net
+ * 
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */ 
+#include "u3_scsi.h"
+#include "u3_error.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include <stdio.h>
+
+#include "sg_err.h"
+
+#define U3_TIMEOUT 2000	//2000 millisecs == 2 seconds 
+
+int u3_open(u3_handle_t *device, const char *which) 
+{
+	FILE *fp;
+
+	u3_set_error(device, "");
+	device->dev = NULL;
+
+	if (strcmp(which, "stdout") == 0) {
+		fp = stdout;
+	} else if (strcmp(which, "stderr") == 0) {
+		fp = stderr;
+	} else {
+		u3_set_error(device, "unknown output '%s', 'stdout' and "
+			"'stderr' only supported", which);
+		return U3_FAILURE;
+	}
+		
+	device->dev = fp;
+	return U3_SUCCESS;
+}
+
+void u3_close(u3_handle_t *device) 
+{
+	FILE *fp = (FILE *)(device->dev);
+//	if (fp != stdout && fp != stderr) {
+//		fclose(fp);
+//	}
+}
+
+int u3_send_cmd(u3_handle_t *device, uint8_t cmd[U3_CMD_LEN],
+		int dxfer_direction, int dxfer_length, uint8_t *dxfer_data,
+		uint8_t *status)
+{
+	FILE *fp = (FILE *)device->dev;
+	int i;
+
+	fprintf(fp, "---------------------------------------------------------"
+			"-----------------------\n");
+
+	fprintf(fp, "Command block:\n");
+	for (i=0; i < U3_CMD_LEN; i++) {
+		fprintf(fp, "%.2X ", cmd[i]);
+	}
+	fprintf(fp, "\n");
+
+	fprintf(fp, "\n");
+	switch (dxfer_direction) {
+		case U3_DATA_NONE:
+			fprintf(fp, "No data\n");
+			break;
+		case U3_DATA_TO_DEV:
+			fprintf(fp, "Sending %d bytes of data to device\n", dxfer_length);
+			
+			fprintf(fp, "Data:");
+			for (i=0; i < dxfer_length; i++) {
+				if (i % 8 == 0) fprintf(fp, "\n%.4x\t", i);
+				fprintf(fp, "%.2x ", dxfer_data[i]);
+			}
+			fprintf(fp, "\n");
+			break;
+		case U3_DATA_FROM_DEV:
+			fprintf(fp, "Reading %d bytes of data from device\n", dxfer_length);
+			memset(dxfer_data, 0, dxfer_length);
+			break;
+	}
+
+	fprintf(fp, "---------------------------------------------------------"
+			"-----------------------\n");
+
+	*status = 0;
+
+	return U3_SUCCESS;
+}
+
+
--- a/src/u3_scsi_sg.c
+++ b/src/u3_scsi_sg.c
@@ -32,13 +32,14 @@
 #include <string.h>
 #include <unistd.h>
 #include <errno.h>
+#include <string.h>
 
 #include <linux/cdrom.h>
 #include <scsi/sg.h>
 
 #include "sg_err.h"
 
-#define U3_TIMEOUT 2000	//2000 millisecs == 2 seconds 
+#define SG_TIMEOUT 2000	//2000 millisecs == 2 seconds 
 
 const char *u3_subsystem_name = "sg";
 const char *u3_subsystem_help = "'/dev/sda0', '/dev/sg3'";
@@ -97,6 +98,7 @@
 {
 	int *sg_fd = (int *)device->dev;
 	close(*sg_fd);
+	free(sg_fd);
 }
 
 int u3_send_cmd(u3_handle_t *device, uint8_t cmd[U3_CMD_LEN],
@@ -123,23 +125,23 @@
 	// Prepare command
 	memset(&io_hdr, 0, sizeof(sg_io_hdr_t));
 	io_hdr.interface_id = 'S';			// fixed
+	io_hdr.dxfer_direction = dxfer_direction;	// Select data direction
 	io_hdr.cmd_len = U3_CMD_LEN;			// length of command in bytes
-	// io_hdr.iovec_count = 0;   			// don't use iovector stuff
-	io_hdr.mx_sb_len = sizeof(sense_buf);		// sense buffer size. do we use this???
-	io_hdr.dxfer_direction = dxfer_direction;	// send data to device
+	io_hdr.mx_sb_len = 0;		// sense buffer size. do we use this???
+	io_hdr.iovec_count = 0;   			// don't use iovector stuff
 	io_hdr.dxfer_len = dxfer_length;		// Size of data transfered
 	io_hdr.dxferp = dxfer_data;			// Data buffer to transfer
 	io_hdr.cmdp = cmd;				// Command buffer to execute
 	io_hdr.sbp = sense_buf;				// Sense buffer
-	io_hdr.timeout = U3_TIMEOUT;			// timeout
-	// io_hdr.flags = 0;	 			// take defaults: indirect IO, etc 
+	io_hdr.timeout = SG_TIMEOUT;			// timeout
+	io_hdr.flags = 0;	 			// take defaults: indirect IO, etc 
 	// io_hdr.pack_id = 0;				// internal packet. used by te program to recognize packets
 	// io_hdr.usr_ptr = NULL;			// user data
 
 	// preform ioctl on device
 	if (ioctl(*sg_fd, SG_IO, &io_hdr) < 0) {
 		u3_set_error(device, "Failed executing scsi command: "
-				"SG_IO ioctl Failed");
+				"SG_IO ioctl failed with %s", strerror(errno));
 		return U3_FAILURE;
 	}
 
--- a/src/u3_scsi_spt.c
+++ b/src/u3_scsi_spt.c
@@ -36,7 +36,7 @@
 #include <windows.h>
 #include <ddk/ntddscsi.h>
 
-#define U3_TIMEOUT 2	// 2 seconds 
+#define SPT_TIMEOUT 2	// 2 seconds 
 
 const char *u3_subsystem_name = "spt";
 const char *u3_subsystem_help = "The drive letter of the device";
@@ -58,11 +58,11 @@
         return U3_FAILURE;
     }
 
-    //take the drive letter and put it in the format used in CreateFile
+    // Take the drive letter and put it in the format used in CreateFile
     memcpy(lpszDeviceName, (char *) "\\\\.\\*:", 7);
     lpszDeviceName[4] = which[0];
 
-    //get a handle to the device, the parameters used here must be used in order for this to work
+    // Get a handle to the device, the parameters used here must be used in order for this to work
     hDevice=CreateFile(lpszDeviceName,
 						GENERIC_READ|GENERIC_WRITE,
 						FILE_SHARE_READ|FILE_SHARE_WRITE,
@@ -71,7 +71,8 @@
 						FILE_ATTRIBUTE_NORMAL,
 						NULL);
 
-    //if for some reason we couldn't get a handle to the device we will try again using slightly different parameters for CreateFile
+    // If for some reason we couldn't get a handle to the device we will try again using slightly
+    // different parameters for CreateFile
     if (hDevice==INVALID_HANDLE_VALUE)
     {
 		u3_set_error(device, "Failed openning handle for %s: Error %d\n", which, GetLastError());
@@ -118,19 +119,40 @@
     sptd.SenseInfoLength    = 0;								// don't use this currently...
     sptd.DataIn             = dxfer_direction;					// data direction
     sptd.DataTransferLength = dxfer_length;					// Size of data transfered
-    sptd.TimeOutValue       = U3_TIMEOUT;						// timeout in seconds
+    sptd.TimeOutValue       = SPT_TIMEOUT;						// timeout in seconds
     sptd.DataBuffer         = dxfer_data;						// data buffer
     //sptd.SenseInfoOffset    = offsetof(SCSI_PASS_THROUGH_WITH_BUFFERS, sbuf);
     memcpy(sptd.Cdb, cmd, U3_CMD_LEN);
 
 	// preform ioctl on device
-    err = DeviceIoControl(hDevice, IOCTL_SCSI_PASS_THROUGH_DIRECT, &sptd,
-						sizeof(sptd), &sptd, sizeof(sptd), &returned, NULL);
+	err = DeviceIoControl(hDevice, IOCTL_SCSI_PASS_THROUGH_DIRECT, &sptd,
+				sizeof(sptd), &sptd, sizeof(sptd), &returned, NULL);
 
 	// evaluate result
 	if (!err) {
-		u3_set_error(device, "Failed executing scsi command: "
-			"Error %d", GetLastError());
+		DWORD errcode;
+		LPVOID lpMsgBuf;
+
+		errcode = GetLastError();
+
+		err = FormatMessage(
+			FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
+			NULL,
+			errcode,
+			0,
+			(LPTSTR) &lpMsgBuf,
+			0,
+			NULL);
+
+		if (err != 0) {
+			u3_set_error(device, "Failed executing scsi command: "
+				"%s (Error %d)", lpMsgBuf, errcode);
+			LocalFree(lpMsgBuf);
+		} else {
+			u3_set_error(device, "Failed executing scsi command: "
+				"Unknown Error %d", errcode);
+		}
+
 		return U3_FAILURE;
 	}
 
--- a/src/u3_scsi_usb.c
+++ b/src/u3_scsi_usb.c
@@ -1,6 +1,6 @@
 /**
  * u3-tool - U3 USB stick manager
- * Copyright (C) 2007 Daviedev, daviedev@users.sourceforge.net
+ * Copyright (C) 2011 Daviedev, daviedev@users.sourceforge.net
  * 
  * 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
@@ -30,34 +30,35 @@
 #include <fcntl.h>
 #include <string.h>
 #include <unistd.h>
+#include <assert.h>
 #include <usb.h>
 #include <errno.h>
 #include <regex.h>
 
 // USB maximum packet length
-#define USB_MAX_PACKET_LEN 256
+#define USB_MAX_PACKET_LEN 2048
 
 // USB command block wrapper length
 #define U3_CBWCB_LEN	12
 
-// USB MSC command/status wrapper signatures
-#define CBW_SIGNATURE		0x43425355
-#define CSW_SIGNATURE		0x53425355
-
 // USB MSC command block wrapper data direction bits
 #define CBW_DATA_IN		0x80
 #define CBW_DATA_OUT		0x00
 #define CBW_DATA_NONE		0x00
 #define CBW_FLAG_DIRECTION	0x80
 
-#define U3_DEVICE_TIMEOUT 20000	//2000 millisecs == 2 seconds 
+#define U3_DEVICE_TIMEOUT 2000	//2000 millisecs == 2 seconds 
 
-#define U3_DEV_LIST_LENGTH 4
-uint16_t u3_dev_list[U3_DEV_LIST_LENGTH][2] = {
+uint16_t u3_dev_list[][2] = {
 	{ 0x08ec, 0x0020 }, // Verbatim Store 'N Go
 	{ 0x0781, 0x5406 }, // Sandisk Cruzer Micro
 	{ 0x0781, 0x5408 }, // Sandisk Cruzer Titanium
 	{ 0x0781, 0x550a }, // Sandisk Cruzer Pattern
+	{ 0x0781, 0x5151 }, // Sandisk Cruzer Micro Skin 8GB (Thanks to dnelson @sf)
+	{ 0x0781, 0x540e }, // Sandisk Cruzer Contour
+	{ 0x0781, 0x5530 }, // Sandisk Cruzer
+	{ 0x0781, 0x5535 }, // Sandisk Ultra Backup
+	{ 0, 0 },
 };
 
 struct u3_usb_handle {
@@ -69,7 +70,7 @@
 typedef struct u3_usb_handle u3_usb_handle_t;
 
 struct usb_msc_cbw {
-	uint32_t dCBWSignature;
+	uint8_t dCBWSignature[4];
 	uint32_t dCBWTag;
 	uint32_t dCBWDataTransferLength;
 	uint8_t bmCBWFlags;
@@ -79,7 +80,7 @@
 } __attribute__ ((packed));
 
 struct usb_msc_csw {
-	uint32_t dCSWSignature;
+	uint8_t dCSWSignature[4];
 	uint32_t dCSWTag;
 	uint32_t dCSWDataResidue;
 	uint8_t bCSWStatus;
@@ -88,7 +89,7 @@
 const char *u3_subsystem_name = "libusb";
 const char *u3_subsystem_help = "'scan' to automatically use the first detected U3 device, or 'vid:pid' if not detected";
 
-struct usb_device *
+static struct usb_device *
 locate_u3_device(uint16_t vid, uint16_t pid)
 {
 	struct usb_bus *bus;
@@ -115,6 +116,7 @@
 {
 	uint16_t vid, pid;
 	regex_t vid_pid_regex;
+	int has_vid_pid = 0;
 
         struct usb_device *u3_device;
 	u3_usb_handle_t *handle_wrapper;
@@ -125,7 +127,6 @@
 
 	int err;
 	char errbuf[U3_MAX_ERROR_LEN];
-	int i;
 
 	// init
 	u3_set_error(device, "");
@@ -137,25 +138,45 @@
 				"expression: %s", errbuf);
 		return U3_FAILURE;
 	}
+	if (regexec(&vid_pid_regex, which, 0, 0, 0) == 0) {
+		// Do de regexing here, this prevents leaking of the
+		// vid_pid_regex memory
+		char *seperator=0;
+		has_vid_pid = 1;
+		vid = strtoul(which, &seperator, 16);
+		pid = strtoul(seperator+1, &seperator, 16);
+	}
+	regfree(&vid_pid_regex);
 
 	usb_init();
 	if (debug)
 		usb_set_debug(255);
 
 	// Find device
-	if (regexec(&vid_pid_regex, which, 0, 0, 0) == 0) {
-		char *seperator=0;
-		vid = strtoul(which, &seperator, 16);
-		pid = strtoul(seperator+1, &seperator, 16);
+	if (has_vid_pid) {
 		u3_device = locate_u3_device(vid, pid);
+
+		if (u3_device == NULL) {
+			u3_set_error(device, "Could not locate the U3 device '%s', "
+					"try 'scan' for first available device", which);
+			return U3_FAILURE;
+		}
 	} else if (strcmp(which, "scan") == 0) {
-		i = 0;
+		int i = 0;
 		u3_device = NULL;
-		while (u3_device == NULL && i < U3_DEV_LIST_LENGTH) {
+		while (u3_device == NULL &&
+		       !(u3_dev_list[i][0] == 0 && u3_dev_list[i][1] == 0))
+		{
 			u3_device = locate_u3_device(u3_dev_list[i][0],
 						u3_dev_list[i][1]);
 			i++;
 		}
+
+		if (u3_device == NULL) {
+			u3_set_error(device, "Could not locate any known U3 device, "
+					"the VID:PID of your device might not be known to U3 tool");
+			return U3_FAILURE;
+		}
 //	} else if (regexec(&serial_regex, which, 0, 0, 0) == 0) {
 //TODO: search for a specific serial number
 	} else {
@@ -164,14 +185,6 @@
 		return U3_FAILURE;
 	}
 
-	regfree(&vid_pid_regex);
-
-	if (u3_device == NULL) {
-		u3_set_error(device, "Could not locate the U3 device '%s', "
-				"try 'scan' for first available device", which);
-		return U3_FAILURE;
-	}
-
 	// Open device
 	handle_wrapper = (u3_usb_handle_t *) malloc(sizeof(u3_usb_handle_t));
 	if (handle_wrapper == NULL) {
@@ -203,8 +216,13 @@
 		goto open_fail;
 	}
 	interface_desc = config_desc->interface->altsetting;
-
 	handle_wrapper->interface_num = interface_desc->bInterfaceNumber;
+	err = usb_detach_kernel_driver_np(handle_wrapper->handle, handle_wrapper->interface_num);
+	if (err != 0 && err != -61) {
+		u3_set_error(device, "failed to detach USB device with %s", strerror(errno));
+		goto open_fail;
+	}
+
 	if ((err=usb_claim_interface(handle_wrapper->handle,
 				handle_wrapper->interface_num)) != 0)
 	{
@@ -274,6 +292,8 @@
 		int dxfer_direction, int dxfer_length, uint8_t *dxfer_data,
 		uint8_t *status)
 {
+	unsigned int tag = 1;
+	int res;
 	u3_usb_handle_t *handle_wrapper = (u3_usb_handle_t *) device->dev;
         struct usb_msc_cbw cbw;
         struct usb_msc_csw csw;
@@ -294,16 +314,21 @@
 	}
 
 	// Prepare command
-        memset(&cbw, 0, sizeof(cbw));
-        cbw.dCBWSignature = CBW_SIGNATURE;
+	memset(&cbw, 0, sizeof(cbw));
+	cbw.dCBWSignature[0] = 'U';
+	cbw.dCBWSignature[1] = 'S';
+	cbw.dCBWSignature[2] = 'B';
+	cbw.dCBWSignature[3] = 'C';
 	cbw.dCBWDataTransferLength = dxfer_length;
-	cbw.bmCBWFlags |= (dxfer_direction & CBW_FLAG_DIRECTION);
-        cbw.bCBWCBLength = U3_CBWCB_LEN;
-        memcpy(&(cbw.CBWCB), cmd, U3_CBWCB_LEN);
+	cbw.bmCBWFlags = dxfer_direction & CBW_FLAG_DIRECTION;
+	cbw.dCBWTag = tag;
+	cbw.bCBWLUN = 1;
+	cbw.bCBWCBLength = U3_CBWCB_LEN;
+	memcpy(&(cbw.CBWCB), cmd, U3_CBWCB_LEN);
 
 	// send command
-        if (usb_bulk_write(handle_wrapper->handle, handle_wrapper->ep_out,
-			(char *) &cbw, sizeof(cbw), U3_DEVICE_TIMEOUT)
+        if ((res = usb_bulk_write(handle_wrapper->handle, handle_wrapper->ep_out,
+			(char *) &cbw, sizeof(cbw), U3_DEVICE_TIMEOUT))
                         != sizeof(cbw))
         {
 		u3_set_error(device, "Failed executing scsi command: "
@@ -321,10 +346,10 @@
 			if (plen > USB_MAX_PACKET_LEN)
 				plen = USB_MAX_PACKET_LEN;
 
-			if (usb_bulk_write(handle_wrapper->handle,
+			if ((res = usb_bulk_write(handle_wrapper->handle,
 					handle_wrapper->ep_out,
 					(char *) dxfer_data+bytes_send, plen,
-					U3_DEVICE_TIMEOUT) != plen)
+					U3_DEVICE_TIMEOUT)) < 0)
 			{
 				u3_set_error(device, "Failed executing scsi command: "
 					"Could not write data to device");
@@ -334,9 +359,9 @@
 			bytes_send += plen;
 		}
 	} else if (dxfer_direction == CBW_DATA_IN) {
-		if (usb_bulk_read(handle_wrapper->handle, handle_wrapper->ep_in,
+		if ((res = usb_bulk_read(handle_wrapper->handle, handle_wrapper->ep_in,
 				(char *) dxfer_data, dxfer_length,
-				U3_DEVICE_TIMEOUT) != dxfer_length)
+				U3_DEVICE_TIMEOUT)) < 0)
 		{
 			u3_set_error(device, "Failed executing scsi command: "
 				"Could not read data from device");
@@ -344,16 +369,20 @@
 		}
 	}
 
+	memset(&csw, 0, sizeof(csw));
+
 	// read command status
-        if (usb_bulk_read(handle_wrapper->handle, handle_wrapper->ep_in,
-			(char *) &csw, sizeof(csw), U3_DEVICE_TIMEOUT)
-                        != sizeof(csw))
+        if ((res = usb_bulk_read(handle_wrapper->handle, handle_wrapper->ep_in,
+			(char *) &csw, sizeof(csw), U3_DEVICE_TIMEOUT))
+                        < 0)
         {
 		u3_set_error(device, "Failed executing scsi command: "
 			"Could not read command status from device");
 		return U3_FAILURE;
         }
 
+	assert(tag == csw.dCSWTag);
+	tag++;
         *status = csw.bCSWStatus;
 
 	return U3_SUCCESS;