Request Sense
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@ -320,3 +320,6 @@ Synchrize time `0xff`:
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# 3 seconds later:
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0000 ff 00 07 e5 08 0a 0b 24 06 00 00 00 00 00 00 00 .......$........
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```
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**Current challange**
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After requesting the `sense` and Direct Access the correct data is not sent.
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190
main.c
190
main.c
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@ -1,5 +1,6 @@
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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@ -8,8 +9,116 @@
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#include "config.h"
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// Section 5.1: Command Block Wrapper (CBW)
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struct command_block_wrapper {
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uint8_t dCBWSignature[4];
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uint32_t dCBWTag;
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uint32_t dCBWDataTransferLength;
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uint8_t bmCBWFlags;
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uint8_t bCBWLUN;
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uint8_t bCBWCBLength;
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uint8_t CBWCB[16];
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};
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// Section 5.2: Command Status Wrapper (CSW)
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struct command_status_wrapper {
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uint8_t dCSWSignature[4];
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uint32_t dCSWTag;
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uint32_t dCSWDataResidue;
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uint8_t bCSWStatus;
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};
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static const uint8_t cdb_length[256] = {
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// 0 1 2 3 4 5 6 7 8 9 A B C D E F
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06,06,06,06,06,06,06,06,06,06,06,06,06,06,06,06, // 0
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06,06,06,06,06,06,06,06,06,06,06,06,06,06,06,06, // 1
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10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10, // 2
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10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10, // 3
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10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10, // 4
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10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10, // 5
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00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00, // 6
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00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00, // 7
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16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16, // 8
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16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16, // 9
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12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12, // A
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12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12, // B
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00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00, // C
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00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00, // D
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00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00, // E
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00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00, // F
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};
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#define REQUEST_SENSE_LENGTH 0x12
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static struct libusb_device_handle *devh = NULL;
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static void perr(char const *format, ...)
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{
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va_list args;
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va_start (args, format);
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vfprintf(stderr, format, args);
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va_end(args);
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}
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static int send_mass_storage_command(libusb_device_handle *handle, uint8_t endpoint, uint8_t lun,
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uint8_t *cdb, uint8_t direction, int data_length, uint32_t *ret_tag)
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{
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static uint32_t tag = 1;
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uint8_t cdb_len;
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int i, r, size;
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struct command_block_wrapper cbw;
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if (cdb == NULL) {
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return -1;
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}
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if (endpoint & LIBUSB_ENDPOINT_IN) {
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perr("send_mass_storage_command: cannot send command on IN endpoint\n");
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return -1;
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}
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cdb_len = cdb_length[cdb[0]];
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if ((cdb_len == 0) || (cdb_len > sizeof(cbw.CBWCB))) {
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perr("send_mass_storage_command: don't know how to handle this command (%02X, length %d)\n",
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cdb[0], cdb_len);
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return -1;
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}
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memset(&cbw, 0, sizeof(cbw));
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cbw.dCBWSignature[0] = 'U';
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cbw.dCBWSignature[1] = 'S';
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cbw.dCBWSignature[2] = 'B';
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cbw.dCBWSignature[3] = 'C';
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*ret_tag = tag;
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cbw.dCBWTag = tag++;
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cbw.dCBWDataTransferLength = data_length;
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cbw.bmCBWFlags = direction;
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cbw.bCBWLUN = lun;
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// Subclass is 1 or 6 => cdb_len
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cbw.bCBWCBLength = cdb_len;
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memcpy(cbw.CBWCB, cdb, cdb_len);
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i = 0;
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do {
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// The transfer length must always be exactly 31 bytes.
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r = libusb_bulk_transfer(handle, endpoint, (unsigned char*)&cbw, 31, &size, 1000);
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if (r == LIBUSB_ERROR_PIPE) {
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libusb_clear_halt(handle, endpoint);
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}
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i++;
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} while ((r == LIBUSB_ERROR_PIPE) && (i<RETRY_MAX));
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if (r != LIBUSB_SUCCESS) {
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perr(" send_mass_storage_command: %s\n", libusb_strerror((enum libusb_error)r));
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return -1;
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}
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printf(" sent %d CDB bytes\n", cdb_len);
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return 0;
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}
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static libusb_device_handle *open_actionpro()
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{
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ssize_t devc;
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@ -77,9 +186,62 @@ static libusb_device_handle *open_actionpro()
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return NULL;
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}
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static int get_mass_storage_status(libusb_device_handle *handle, uint8_t endpoint, uint32_t expected_tag)
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{
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int i, r, size;
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struct command_status_wrapper csw;
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// The device is allowed to STALL this transfer. If it does, you have to
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// clear the stall and try again.
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i = 0;
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do {
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r = libusb_bulk_transfer(handle, endpoint, (unsigned char*)&csw, 13, &size, 1000);
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if (r == LIBUSB_ERROR_PIPE) {
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libusb_clear_halt(handle, endpoint);
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}
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i++;
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} while ((r == LIBUSB_ERROR_PIPE) && (i<RETRY_MAX));
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if (r != LIBUSB_SUCCESS) {
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perr(" get_mass_storage_status: %s\n", libusb_strerror((enum libusb_error)r));
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return -1;
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}
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if (size != 13) {
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perr(" get_mass_storage_status: received %d bytes (expected 13)\n", size);
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return -1;
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}
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if (csw.dCSWTag != expected_tag) {
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perr(" get_mass_storage_status: mismatched tags (expected %08X, received %08X)\n",
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expected_tag, csw.dCSWTag);
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return -1;
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}
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// For this test, we ignore the dCSWSignature check for validity...
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printf(" Mass Storage Status: %02X (%s)\n", csw.bCSWStatus, csw.bCSWStatus?"FAILED":"Success");
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if (csw.dCSWTag != expected_tag)
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return -1;
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if (csw.bCSWStatus) {
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// REQUEST SENSE is appropriate only if bCSWStatus is 1, meaning that the
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// command failed somehow. Larger values (2 in particular) mean that
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// the command couldn't be understood.
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if (csw.bCSWStatus == 1)
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return -2; // request Get Sense
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else
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return -1;
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}
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// In theory we also should check dCSWDataResidue. But lots of devices
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// set it wrongly.
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return 0;
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}
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int main(int argc, char *argv[])
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{
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int res = 0;
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uint8_t cdb[16];
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uint8_t sense[18];
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int transferred = 0;
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uint32_t expected_tag = 0;
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res = libusb_init(NULL);
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if (res < 0) {
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@ -94,6 +256,34 @@ int main(int argc, char *argv[])
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exit(EXIT_FAILURE);
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}
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unsigned char cmd[] = "\xfe\x00\x58\x37\x41\x50\x50\x41\x53\x00\x00\x00\x00\x00\x00\x00";
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memset(sense, 0, sizeof(sense));
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memset(cdb, 0, sizeof(cdb));
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cdb[0] = 0x03;
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cdb[4] = REQUEST_SENSE_LENGTH;
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send_mass_storage_command(devh, 0x01, 0, cdb, LIBUSB_ENDPOINT_IN, REQUEST_SENSE_LENGTH, &expected_tag);
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res = libusb_bulk_transfer(devh, 0x81, (unsigned char *)&sense, REQUEST_SENSE_LENGTH, &transferred, 1000);
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if (res < 0) {
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perror("libusb_bulk_transfer");
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fprintf(stderr, "Error: %s\n", libusb_strerror(res));
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libusb_release_interface(devh, 0);
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libusb_reset_device(devh);
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libusb_close(devh);
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libusb_exit(NULL);
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exit(EXIT_FAILURE);
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}
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get_mass_storage_status(devh, 0x1, expected_tag);
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libusb_release_interface(devh, 0);
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libusb_reset_device(devh);
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libusb_close(devh);
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libusb_exit(NULL);
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exit(EXIT_SUCCESS);
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