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main.c
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main.c
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/*
** Filename: main.c
**
** Automatically created by Application Wizard 1.4.2
**
** Part of solution BH-EU in project USB-Writeblocker
**
** Based on USBSlaveHIDKbd example by FTDI
** Some ideas also borrowed from examples from John Hyde's USB by Design
**
** Modifications by Philip A. Polstra, Sr.
**
** Part of the USB Mass Storage Device impersonator as presented at DEFCON 20
** Based on USB Write blocker presented at Blackhat Europe 2012
**
** Comments:
**
** Important: Sections between markers "FTDI:S*" and "FTDI:E*" will be overwritten by
** the Application Wizard
*/
#include "stdlib.h"
#include "stdio.h"
#include "string.h"
#include "main.h"
#include "GPIO.h"
#include "Timers.h"
#include "USBSlaveBomsDrv.h"
#include "USBHostBomsDrv.h"
//Thread prototypes
vos_tcb_t *tcbHostIn, *tcbHostOut, *tcbHostEnum, *tcbTimer, *tcbButtons;
void handleCbw();
void hostEnum();
void timer();
void handleButtons();
extern void update_lcd_vidpid();
// Handles to the devices we need to pull this off
VOS_HANDLE hUSBHOST_2; // host port
VOS_HANDLE hUSBHOSTBOMS; // device for talking mass storage
VOS_HANDLE hUSBSLAVE_1; // slave port - one attached to PC
VOS_HANDLE hUSBSLAVEBOMS;
VOS_HANDLE hGPIO_PORT_E; // GPIO B is used for buttons
VOS_HANDLE hTimer; // timer is set and reest on successful mounting
VOS_HANDLE hGPIO_PORT_B; // port B for LCD display
unsigned short blockSize=512; // default to 512
unsigned long deviceCapacity; // capacity for our actual drive
unsigned short maxLuns=1; // default to 1
vos_mutex_t vidPidMutex; // mutex for current vid/pid
vos_semaphore_t setupDoneSemaphore; // semaphore to indicate setup is done
unsigned char illegalRequest=0; // this flag is set after an illegal request
unsigned char writeProtect=1; // this flag is for enabling or disabling write protect
unsigned char autoMode=1; // should we try to automatically scan?
extern usbSlaveBoms_context *slaveBomsCtx;
extern usbhostBoms_context_t *hostBomsCtx;
extern int currentVidPidIndex;
extern unsigned short vidPid[];
unsigned int vidPidSize = 1044;
/* Declaration for IOMUx setup function */
void iomux_setup(void);
// LCD control signals
#define lcd_rs 0x10
#define lcd_e 0x20
// LED port masks
#define led_green 0x80
#define led_red 0x40
void light_red_led(VOS_HANDLE hLED)
{
unsigned char toggle;
// first we read port to not mess up the LCD display
vos_dev_read(hLED, &toggle, 1, NULL);
toggle &= (~led_green);
toggle |= led_red;
vos_dev_write(hLED, &toggle, 1, NULL);
}
void light_green_led(VOS_HANDLE hLED)
{
unsigned char toggle;
vos_dev_read(hLED, &toggle, 1, NULL);
toggle &= (~led_red);
toggle |= led_green;
vos_dev_write(hLED, &toggle, 1, NULL);
}
// Send a command to our LCD display
void write_lcd_cmd(VOS_HANDLE hLCD, unsigned char byte)
{
unsigned char cmd, leds;
// first read state to not mess up LEDs on same port
leds = writeProtect?led_green:led_red;
// Write High nibble data to LCD
cmd = (((byte >> 4) &0x0F) | lcd_e);
cmd = (cmd &(~lcd_rs)) | leds; // Select Registers
vos_dev_write(hLCD,&cmd,1,NULL);
// Toggle 'E' pin
cmd &= (~lcd_e);
vos_dev_write(hLCD,&cmd,1,NULL);
// Write Low nibble data to LCD
cmd = ((byte &0x0F) | lcd_e);
cmd = (cmd &(~lcd_rs)) | leds; // Select Registers
vos_dev_write(hLCD,&cmd,1,NULL);
// Toggle 'E' pin
cmd &= (~lcd_e);
vos_dev_write(hLCD,&cmd,1,NULL);
vos_delay_msecs(1);
}
// Send data to LCD display
void write_lcd_data(VOS_HANDLE hLCD, unsigned char byte)
{
unsigned char cmd, leds;
// first read state to not mess up LEDs on same port
leds = writeProtect?led_green:led_red;
// Write High nibble data to LCD
cmd = (((byte >> 4)&0x0F) | lcd_rs);
cmd = (cmd | lcd_e) | leds; // Select DDRAM
vos_dev_write(hLCD,&cmd,1,NULL);
// Toggle 'E' pin
cmd &= (~lcd_e);
vos_dev_write(hLCD,&cmd,1,NULL);
// Write Low nibble data to LCD
cmd = ((byte & 0x0F) | lcd_rs);
cmd = (cmd | lcd_e) | leds; // Select DDRAM
vos_dev_write(hLCD,&cmd,1,NULL);
// Toggle 'E' pin
cmd &= (~lcd_e);
vos_dev_write(hLCD,&cmd,1,NULL);
vos_delay_msecs(1);
}
// Write a string at the current cursor position
void write_lcd_str(VOS_HANDLE hLCD, char *str)
{
while(*str != '\0')
{
write_lcd_data(hLCD, (unsigned char*)*str);
++str;
}
}
// Attempt to init the LCD display
void lcd_ini(VOS_HANDLE hLCD)
{
vos_delay_msecs(100);
// Send Reset command
write_lcd_cmd(hLCD, 0x03);
vos_delay_msecs(2);
// Send Function Set
write_lcd_cmd(hLCD, 0x28);
vos_delay_msecs(2);
write_lcd_cmd(hLCD, 0x28);
vos_delay_msecs(2);
// Send Display control command
write_lcd_cmd(hLCD, 0x0C);
vos_delay_msecs(2);
// Send Display Clear command
write_lcd_cmd(hLCD, 0x01);
vos_delay_msecs(2);
// Send Entry Mode Set command
write_lcd_cmd(hLCD, 0x06);
vos_delay_msecs(2);
}
// Clear LCD and reset cursor
void lcd_clear(VOS_HANDLE hLcd)
{
// Send Display Clear command
write_lcd_cmd(hLcd, 0x01);
vos_delay_msecs(2);
}
// Write to the top line of our display
void write_lcd_line1(VOS_HANDLE hLcd, char* str)
{ // Set 1-st line address
write_lcd_cmd(hLcd, (0x01 | 0x80));
// Send string to LCD
write_lcd_str(hLcd, str);
}
// Write to the bottom line of our display
void write_lcd_line2(VOS_HANDLE hLcd, char* str)
{
// Set 2-nd line address
write_lcd_cmd(hLcd, (0x40 | 0x80));
// Send string to LCD
write_lcd_str(hLcd, str);
}
/* Main code - entry point to firmware */
void main(void)
{
// these are needed by VOS to intialize General Purpose IO ports
gpio_context_t gpioContextE, gpioContextB;
// USB Host configuration context
usbhost_context_t usbhostContext;
// initialize the VOS kernel
vos_init(50, VOS_TICK_INTERVAL, VOS_NUMBER_DEVICES);
vos_set_clock_frequency(VOS_48MHZ_CLOCK_FREQUENCY);
vos_set_idle_thread_tcb_size(512);
// map the pins to appropriate ports
iomux_setup();
// set up the button ports
gpioContextE.port_identifier = GPIO_PORT_E;
gpio_init(VOS_DEV_GPIO_PORT_E, &gpioContextE);
// initialize the LCD port
gpioContextB.port_identifier = GPIO_PORT_B;
gpio_init(VOS_DEV_GPIO_PORT_B, &gpioContextB);
// must be called to initialize slave port
usbslave_init(0, VOS_DEV_USBSLAVE_1);
usbslaveboms_init(VOS_DEV_USBSLAVEBOMS);
// Initialize USB Host
usbhostContext.if_count = 4;
usbhostContext.ep_count = 8;
usbhostContext.xfer_count = 4;
usbhostContext.iso_xfer_count = 0;
usbhost_init(-1, VOS_DEV_USBHOST_2, &usbhostContext);
usbhostBoms_init(VOS_DEV_USBHOSTBOMS);
// this mutex is used to control access to the current VID/PID index
vos_init_mutex(&vidPidMutex, 0);
// this semaphore is used to signal when the setup is done
vos_init_semaphore(&setupDoneSemaphore, 0);
// create some threads
// Note: additonal threads are created by our USB slave driver and VOS
tcbHostIn = vos_create_thread_ex(27, 1024, handleCbw, "Handle_CBW", 0);
tcbHostEnum = vos_create_thread_ex(28, 1024, hostEnum, "Host_Enum", 0);
tcbTimer = vos_create_thread_ex(20, 512, timer, "Timer", 0);
tcbButtons = vos_create_thread_ex(19, 512, handleButtons, "Handle Buttons", 0);
// this call starts the scheduler and never returns
vos_start_scheduler();
main_loop:
goto main_loop;
}
// Gets the connect state of host port
// If the host port is not set up it returns disconnected
unsigned char usbhost_connect_state(VOS_HANDLE hUSB)
{
unsigned char connectstate = PORT_STATE_DISCONNECTED;
usbhost_ioctl_cb_t hc_iocb;
if (hUSB)
{
hc_iocb.ioctl_code = VOS_IOCTL_USBHOST_GET_CONNECT_STATE;
hc_iocb.get = &connectstate;
vos_dev_ioctl(hUSB, &hc_iocb);
}
return connectstate;
}
// Open all the drivers required by our application
void open_drivers(void)
{
gpio_ioctl_cb_t gpio_iocb;
unsigned char leds;
hGPIO_PORT_E = vos_dev_open(VOS_DEV_GPIO_PORT_E);
// power up Vinco USB Host
// This is a poorly documented "feature" of Vinco board
// Pins 40 & 41 of VNC2 chip must be set low to enable power
// on host port and turn on LED
// this must happen before we want to enumerate the flash drive
gpio_iocb.ioctl_code = VOS_IOCTL_GPIO_SET_MASK;
gpio_iocb.value = 0x60; // set power and LED as output
vos_dev_ioctl(hGPIO_PORT_E, &gpio_iocb);
leds = 0x00;
vos_dev_write(hGPIO_PORT_E, &leds, 1, NULL);
// set up port B for LCD display and for 2 status LEDs
hGPIO_PORT_B = vos_dev_open(VOS_DEV_GPIO_PORT_B);
gpio_iocb.ioctl_code = VOS_IOCTL_GPIO_SET_MASK;
gpio_iocb.value = 0xff; // set all of Port B to output LCD & 2 LEDs
vos_dev_ioctl(hGPIO_PORT_B, &gpio_iocb);
// open our USB ports
hUSBHOST_2 = vos_dev_open(VOS_DEV_USBHOST_2);
hUSBHOSTBOMS = vos_dev_open(VOS_DEV_USBHOSTBOMS);
hUSBSLAVE_1 = vos_dev_open(VOS_DEV_USBSLAVE_1);
hUSBSLAVEBOMS = vos_dev_open(VOS_DEV_USBSLAVEBOMS);
}
void attach_drivers(void)
{
common_ioctl_cb_t bomsAttach;
// attach BOMS to USB Host port B
bomsAttach.ioctl_code = VOS_IOCTL_USBHOSTBOMS_ATTACH;
bomsAttach.set.data = (void *) hUSBHOST_2;
vos_dev_ioctl(hUSBHOSTBOMS, &bomsAttach);
// attach BOMS to USB Slave port A
bomsAttach.ioctl_code = VOS_IOCTL_USBSLAVEBOMS_ATTACH;
bomsAttach.set.data = (void *) hUSBSLAVE_1;
vos_dev_ioctl(hUSBSLAVEBOMS, &bomsAttach);
}
void close_drivers(void)
{
vos_dev_close(hUSBHOST_2);
vos_dev_close(hUSBHOSTBOMS);
vos_dev_close(hUSBSLAVE_1);
vos_dev_close(hUSBSLAVEBOMS);
vos_dev_close(hGPIO_PORT_E);
}
/* Application Threads */
// This timer is used to determine if our device has successfully connected
// When the device is first enumerated this timer is set. This thread then
// blocks till the timer expires. When the timer expires we increment the
// index into our VID/PID list. If the device is connected the timer is
// cancelled.
void timer()
{
tmr_ioctl_cb_t tmr_iocb;
// here we set up the timer, but don't start it
// timer is started by the USB slave driver when someone
// starts talking to it
hTimer = vos_dev_open(TIMER0);
tmr_iocb.ioctl_code = VOS_IOCTL_TIMER_SET_TICK_SIZE;
tmr_iocb.param = TIMER_TICK_MS;
vos_dev_ioctl(hTimer, &tmr_iocb);
tmr_iocb.ioctl_code = VOS_IOCTL_TIMER_SET_COUNT;
tmr_iocb.param = 1000; // 1s
vos_dev_ioctl(hTimer, &tmr_iocb);
tmr_iocb.ioctl_code = VOS_IOCTL_TIMER_SET_DIRECTION;
tmr_iocb.param = TIMER_COUNT_DOWN;
vos_dev_ioctl(hTimer, &tmr_iocb);
tmr_iocb.ioctl_code = VOS_IOCTL_TIMER_SET_MODE;
tmr_iocb.param = TIMER_MODE_SINGLE_SHOT;
vos_dev_ioctl(hTimer, &tmr_iocb);
// if our device is connected this never gets past blocking call
while (1)
{
tmr_iocb.ioctl_code = VOS_IOCTL_TIMER_WAIT_ON_COMPLETE;
vos_dev_ioctl(hTimer, &tmr_iocb);
vos_lock_mutex(&vidPidMutex);
if (autoMode)
{
currentVidPidIndex += 2;
if (currentVidPidIndex > sizeof(vidPid))
currentVidPidIndex = 0;
}
vos_unlock_mutex(&vidPidMutex);
}
}
// This is the main thread. It enumerates the attached drive and
// forwards commands to the drive if they are safe of if write
// blocking is disabled.
void hostEnum()
{
unsigned char i;
unsigned char status;
unsigned char buf[64];
unsigned short num_read;
unsigned int handle;
char *str1; // line one of display
char *str2; // line two of display
usbhostBoms_ioctl_t generic_iocb;
usbhost_device_handle_ex ifDev;
usbhost_ioctl_cb_t hc_iocb;
usbhost_ioctl_cb_class_t hc_iocb_class;
usbhostBoms_ioctl_cb_attach_t genericAtt;
gpio_ioctl_cb_t gpio_iocb2;
num_read = 0; // just here to set breakpoint
open_drivers();
// display welcome greeting
lcd_ini(hGPIO_PORT_B);
lcd_clear(hGPIO_PORT_B);
vos_delay_msecs(100); // delay a tad to reliably clear screen
str1 = "All UR Endpoint";
write_lcd_line1(hGPIO_PORT_B, str1);
str2 = " R belong 2 us";
write_lcd_line2(hGPIO_PORT_B, str2);
// now give them a chance to change the VID/PID
vos_delay_msecs(1000);
str1 = "Enter VID/PID ";
write_lcd_line1(hGPIO_PORT_B, str1);
str2 = "or wait 4 auto ";
write_lcd_line2(hGPIO_PORT_B, str2);
vos_wait_semaphore(&setupDoneSemaphore); // wait for setup to complete
vos_signal_semaphore(&setupDoneSemaphore); // reset semaphore for next guy
attach_drivers(); // enumerate flash drive then connect slave
do
{
// see if bus available
if (usbhost_connect_state(hUSBHOST_2) == PORT_STATE_ENUMERATED)
{
hc_iocb_class.dev_class = USB_CLASS_MASS_STORAGE;
hc_iocb_class.dev_subclass = USB_SUBCLASS_MASS_STORAGE_SCSI;
hc_iocb_class.dev_protocol = USB_PROTOCOL_MASS_STORAGE_BOMS;
// user ioctl to find first hub device
hc_iocb.ioctl_code = VOS_IOCTL_USBHOST_DEVICE_FIND_HANDLE_BY_CLASS;
hc_iocb.handle.dif = NULL;
hc_iocb.set = &hc_iocb_class;
hc_iocb.get = &ifDev;
vos_dev_ioctl(hUSBHOST_2, &hc_iocb);
genericAtt.hc_handle = hUSBHOST_2;
genericAtt.ifDev = ifDev;
generic_iocb.ioctl_code = VOS_IOCTL_USBHOSTBOMS_ATTACH;
generic_iocb.set.att = &genericAtt;
// we use a simple variable to indicate if the flash drive
// is attached
// this is not as elegent as using a semaphore, but
// this is the only thread that updates this variable and
// if the device is disconnected and reconnected that is hard
// to handle with a semaphore
if (vos_dev_ioctl(hUSBHOSTBOMS, &generic_iocb) == USBHOSTBOMS_OK)
{
slaveBomsCtx->flashConnected = 1;
vos_signal_semaphore(&slaveBomsCtx->enumed);
str1 = "Successfully ";
write_lcd_line1(hGPIO_PORT_B, str1);
str2 = " read drive ";
write_lcd_line2(hGPIO_PORT_B, str2);
} else
{
slaveBomsCtx->flashConnected = 0;
str1 = "Oh Snap! UR ";
write_lcd_line1(hGPIO_PORT_B, str1);
str2 = "drive !enumed ";
write_lcd_line2(hGPIO_PORT_B, str2);
}// if attach
// this code is in here so that if the drive gets disconnected
// we can try to restart it
// also, hopefully the the traffic every few seconds will keep
// the drive from going to sleep
vos_delay_msecs(2000);
} // if enumerated
vos_delay_msecs(10); // recheck every .01 seconds for new connect
} // outer do
while (1);
}
// The following functions forward commands and such to the attached
// mass storage device.
unsigned short forward_cbw_to_device(boms_cbw_t *cbw)
{
unsigned short num_written;
usbhostBoms_write((void*)cbw, sizeof(boms_cbw_t), &num_written, hostBomsCtx);
return num_written;
}
unsigned short receive_data_from_device(void* buffer, unsigned short expected)
{
unsigned short num_read;
unsigned char status;
status = usbhostBoms_read(buffer, expected, &num_read, hostBomsCtx);
if (status == USBHOST_EP_HALTED)
{
// the endpoint is halted so let's halt the slave endpoint
usbslaveboms_stall_bulk_in(slaveBomsCtx);
}
return num_read;
}
unsigned short forward_data_to_slave(void* buffer, unsigned short bytes)
{
unsigned short num_written;
usbSlaveBoms_write(buffer, bytes, &num_written, slaveBomsCtx);
return num_written;
}
unsigned short forward_data_to_slave_then_stall(void* buffer, unsigned short bytes)
{
unsigned short num_written;
usbSlaveBoms_short_write(buffer, bytes, &num_written, slaveBomsCtx);
return num_written;
}
unsigned short receive_csw_from_device(boms_csw_t *csw)
{
unsigned short num_read;
usbhostBoms_read((void*)csw, 13, &num_read, hostBomsCtx);
return num_read;
}
unsigned short forward_csw_to_slave(boms_csw_t *csw)
{
unsigned short num_written;
usbSlaveBoms_write((void*)csw, 13, &num_written, slaveBomsCtx);
return num_written;
}
// The handle_xxxxx functions are used to handle various requests
// of our faked mass storage device. While it would be wonderful
// to implement this in a nice object-oriented fashion, there are
// too many variables and the microcontroller doesn't handle lots
// of function calls very well so we must live with lots of cut
// and paste action here. Sorry!
void handle_inquiry(boms_cbw_t *cbw)
{
unsigned char buffer[64];
unsigned short responseSize;
boms_csw_t csw;
// forward the CBW to device
if (forward_cbw_to_device(cbw))
{
// receive response from device
// note we will assume that only the standard 36 bytes will be requested
if (responseSize = receive_data_from_device(&buffer[0], 36))
{
// forward response to slave
forward_data_to_slave(&buffer[0], responseSize);
// receive CSW from device
if (receive_csw_from_device(&csw))
{
// forward CSW to slave
forward_csw_to_slave(&csw);
}
}
}
}
void handle_test_unit_ready(boms_cbw_t *cbw)
{
boms_csw_t csw;
// forward the CBW to device
if (forward_cbw_to_device(cbw))
{
// receive response from device
if (receive_csw_from_device(&csw))
{
// forward CSW to slave
forward_csw_to_slave(&csw);
}
}
}
void handle_read(boms_cbw_t *cbw)
{
// this same routine handles all 3 possible read commands
// most likely read command is read(10)
unsigned long lba; // logical block address for start block
unsigned short blocks; // number of blocks to read
unsigned short i;
boms_csw_t csw;
unsigned char *buffer;
unsigned short num_read;
unsigned short num_written;
switch (cbw->cb.formated.command)
{
case BOMS_READ_6:
lba = cbw->cb.raw[1]*65536 + cbw->cb.raw[2]*256 + cbw->cb.raw[3];
blocks = cbw->cb.raw[4];
break;
case BOMS_READ_10:
lba = cbw->cb.raw[2]*16777216 + cbw->cb.raw[3]*65536 + cbw->cb.raw[4]*256 +cbw->cb.raw[5];
blocks = cbw->cb.raw[7] * 256 + cbw->cb.raw[8];
break;
case BOMS_READ_12:
lba = cbw->cb.raw[2]*16777216 + cbw->cb.raw[3]*65536 + cbw->cb.raw[4]*256 +cbw->cb.raw[5];
// we are being a little bad here the number of blocks is actually a long
// it is extremely unlikely that anyone would request this much at once, however
blocks = cbw->cb.raw[8] * 256 + cbw->cb.raw[9];
break;
}
// now forward the cbw to the device
forward_cbw_to_device(cbw);
// receive the appropriate number of blocks from the device
// forward the blocks to the slave
// most requests are probably 1 block of 512 bytes
// read in 512 byte chunks (packet size is 64 bytes, but VOS should handle this)
// If devices with larger blocks are encountered, 512 should still work
buffer = vos_malloc(blockSize);
while(blocks>0)
{
usbhostBoms_read((void*)buffer, blockSize, &num_read, hostBomsCtx);
usbSlaveBoms_write((void*)buffer, num_read, &num_written, slaveBomsCtx);
blocks--;
}
vos_free(buffer);
// receive the csw from the device
receive_csw_from_device(&csw);
// forward the csw to the slave
forward_csw_to_slave(&csw);
}
void handle_read_capacity(boms_cbw_t *cbw)
{
boms_csw_t csw;
unsigned char buffer[8];
unsigned short received;
// forward cbw to device
forward_cbw_to_device(cbw);
// receive response from device
if (received = receive_data_from_device(&buffer[0], 8))
{
deviceCapacity = buffer[0]*16777216 + buffer[1]*65536 + buffer[2]*256 +buffer[3];
blockSize = buffer[4]*16777216 + buffer[5]*65536 + buffer[6]*256 +buffer[7];
// forward response to slave
forward_data_to_slave(&buffer[0], received);
}
// receive csw from device
receive_csw_from_device(&csw);
// forward csw to slave
forward_csw_to_slave(&csw);
}
void handle_report_luns(boms_cbw_t *cbw)
{
boms_csw_t csw;
unsigned char buffer[64];
unsigned short received;
// forward cbw
forward_cbw_to_device(cbw);
// receive response from device
// response is 8 bytes + maxLuns * 8
if (received = receive_data_from_device(&buffer[0], 8 + 8 * maxLuns))
{
// forward response to slave
forward_data_to_slave(&buffer[0], received);
}
// receive csw from device
receive_csw_from_device(&csw);
// forward csw to slave
forward_csw_to_slave(&csw);
}
void handle_request_sense(boms_cbw_t *cbw)
{
boms_csw_t csw;
unsigned char bytesRequested;
unsigned short bytesRead, bytesWritten;
unsigned char *buffer;
request_sense_response_t rsr;
if (illegalRequest)
{
// if we are here this a a request sense that came right after an illegal
// command request - perhaps somebody tried to modify our drive!
// we return the appropriate error directly and a CSW
// the device is never touched
illegalRequest = 0; // reset so next request goes to actual device
rsr.formated.responseCode =0x70; //0x70 current error
rsr.formated.valid = 0; // 1=INFORMATION field valid
rsr.formated.obsolete = 0;
rsr.formated.senseKey = 0x05; // 0x05 for illegal request
rsr.formated.resvered = 0;
rsr.formated.ili = 0; // incorrect length indicator
rsr.formated.eom = 0; // end of media for streaming devices
rsr.formated.filemark = 0; // for streaming devices
rsr.formated.information = 0; // device specific info
rsr.formated.addSenseLen = 0x0a; // additional bytes that follow 244 max
rsr.formated.cmdSpecInfo = 0; // command specific info
rsr.formated.asc = 0x20; // additional sense code 0x20 for illegal command
rsr.formated.ascq = 0; // additional sense code qualifier 0-unused
rsr.formated.fruc = 0; // field replaceable unit code set to 0
rsr.formated.senseKeySpecific[0] = 0; //senses key spec info if b7=1
rsr.formated.senseKeySpecific[1] = 0;
rsr.formated.senseKeySpecific[2] = 0;
bytesWritten = forward_data_to_slave(&rsr, 18);
// now send an appropriate CSW to indicate success of this command
csw.sig[0] = 'U'; //"USBS"
csw.sig[1] = 'S';
csw.sig[2] = 'B';
csw.sig[3] = 'S';
csw.tag = cbw->tag;
csw.residue = 0;
csw.status = 0; // 0x00=success 0x01=failure 0x02=phase error
forward_csw_to_slave(&csw);
} else
{
// forward cbw
bytesRequested = cbw->cb.raw[4];
forward_cbw_to_device(cbw);
buffer = vos_malloc((unsigned short)bytesRequested);
// receive data from device
if (bytesRead = receive_data_from_device(buffer, (unsigned short)bytesRequested))
{
bytesWritten = forward_data_to_slave(buffer, bytesRead);
}
vos_free(buffer);
// receive csw from device
receive_csw_from_device(&csw);
// forward csw to slave
forward_csw_to_slave(&csw);
}
}
void handle_mode_sense(boms_cbw_t *cbw)
{
boms_csw_t csw;
unsigned short allocLength=0;
unsigned char *buffer=NULL;
unsigned short bytesReceived=0;
// forward the cbw to the device
switch (cbw->cb.formated.command)
{
case BOMS_MODE_SENSE_6:
allocLength = cbw->cb.raw[4];
break;
case BOMS_MODE_SENSE_10:
allocLength = cbw->cb.raw[7]*256 + cbw->cb.raw[8];
break;
}
forward_cbw_to_device(cbw);
// receive data from device
if (allocLength)
{
buffer = vos_malloc(allocLength);
bytesReceived = receive_data_from_device(buffer, allocLength);
// forward data to slave
forward_data_to_slave(buffer, bytesReceived);
vos_free(buffer);
}
// receive csw from device
receive_csw_from_device(&csw);
// forward csw to slave
forward_csw_to_slave(&csw);
}
void handle_mode_select(boms_cbw_t *cbw)
{
boms_csw_t csw;
unsigned short allocLength=0;
unsigned char *buffer=NULL;
unsigned short bytesReceived=0;
// forward the cbw to the device
switch (cbw->cb.formated.command)
{
case BOMS_MODE_SELECT_6:
allocLength = cbw->cb.raw[4];
break;
case BOMS_MODE_SELECT_10:
allocLength = cbw->cb.raw[7]*256 + cbw->cb.raw[8];
break;
}
forward_cbw_to_device(cbw);
// receive data from device
if (allocLength)
{
buffer = vos_malloc(allocLength);
bytesReceived = receive_data_from_device(buffer, allocLength);
// forward data to slave
forward_data_to_slave(buffer, bytesReceived);
vos_free(buffer);
}
// receive csw from device
receive_csw_from_device(&csw);
// forward csw to slave
forward_csw_to_slave(&csw);
}
void handle_illegal_request(boms_cbw_t *cbw)
{
usbslave_ioctl_cb_t iocb;
boms_csw_t csw;
// now send the CSW
csw.sig[0]='U';
csw.sig[1]='S';
csw.sig[2]='B';
csw.sig[3]='S';//"USBS"
csw.tag=cbw->tag;
csw.residue=0;
csw.status=0x01; // 0x00=success 0x01=failure 0x02=phase error
forward_csw_to_slave(&csw);
// flag the error for the anticipated call to REQUEST SENSE
illegalRequest=1;
}
void handle_illegal_write_request(boms_cbw_t *cbw)
{
usbslave_ioctl_cb_t iocb;
boms_csw_t csw;
unsigned short blocks;
unsigned char *buffer;
unsigned short num_read;
unsigned short i;
// as strange as it may seem, there is no way to tell the host to quit
// instead we need to receive all this data and throw it away!
switch (cbw->cb.formated.command)
{
case BOMS_WRITE_6:
blocks = cbw->cb.raw[4];
break;
case BOMS_WRITE_10:
blocks = cbw->cb.raw[7] * 256 + cbw->cb.raw[8];
break;
case BOMS_WRITE_12:
// we are being a little bad here the number of blocks is actually a long
// it is extremely unlikely that anyone would request this much at once, however
blocks = cbw->cb.raw[8] * 256 + cbw->cb.raw[9];
break;
}
buffer = vos_malloc(512);
iocb.ioctl_code = VOS_IOCTL_USBSLAVE_TRANSFER;
iocb.handle = slaveBomsCtx->out_ep;
iocb.request.setup_or_bulk_transfer.buffer = buffer;
iocb.request.setup_or_bulk_transfer.size = 512;
iocb.request.setup_or_bulk_transfer.bytes_transferred = 0;
for (i = 0; i < (blocks * (512/blockSize)); i++)
{
// process bytes received from host
vos_dev_ioctl(slaveBomsCtx->handle,&iocb);
}
vos_free(buffer);
// now send the CSW
csw.sig[0]='U';
csw.sig[1]='S';
csw.sig[2]='B';
csw.sig[3]='S';//"USBS"
csw.tag=cbw->tag;
csw.residue=0;
csw.status=0x00; // 0x00=success 0x01=failure 0x02=phase error
//forward_csw_to_slave(&csw);
iocb.ioctl_code = VOS_IOCTL_USBSLAVE_TRANSFER;
iocb.handle = slaveBomsCtx->in_ep;
iocb.request.setup_or_bulk_transfer.buffer = &csw;
iocb.request.setup_or_bulk_transfer.size = sizeof(boms_csw_t);
vos_dev_ioctl(slaveBomsCtx->handle, &iocb);
}
void handle_write_request(boms_cbw_t *cbw)
{
usbslave_ioctl_cb_t iocb;
boms_csw_t csw;
unsigned short blocks;
unsigned char *buffer;
unsigned short num_read, num_written;
unsigned short i;
switch (cbw->cb.formated.command)
{
case BOMS_WRITE_6:
blocks = cbw->cb.raw[4];
break;
case BOMS_WRITE_10:
blocks = cbw->cb.raw[7] * 256 + cbw->cb.raw[8];
break;
case BOMS_WRITE_12:
// we are being a little bad here the number of blocks is actually a long
// it is extremely unlikely that anyone would request this much at once, however
blocks = cbw->cb.raw[8] * 256 + cbw->cb.raw[9];
break;
}
// forward the cbw to the device
forward_cbw_to_device(cbw);
// create a buffer for each 512 byte block
// Note: we are assuming a 512 byte block size for our attached device.
// While this is a fairly good assumption, I am told that there are devices
// with larger block sizes out there. If you have such a device don't
// connect it or things will fail. There are plenty of 512 byte block
// devices to choose from. If you don't like this limitation, feel free
// to modify this code accordingly.
buffer = vos_malloc(blockSize);
while(blocks>0)
{
usbSlaveBoms_read((void*)buffer, blockSize, &num_read, slaveBomsCtx);
usbhostBoms_write((void*)buffer, num_read, &num_written, hostBomsCtx);
blocks--;
}
vos_free(buffer);
// receive csw from device
receive_csw_from_device(&csw);
// forward csw to slave
forward_csw_to_slave(&csw);
}
void handle_send_diagnostic(boms_cbw_t *cbw)
{
usbslave_ioctl_cb_t iocb;
boms_csw_t csw;
// first send ZLDP to ACK the command
iocb.ioctl_code = VOS_IOCTL_USBSLAVE_TRANSFER;
iocb.handle = slaveBomsCtx->in_ep;
iocb.request.setup_or_bulk_transfer.buffer = NULL;
iocb.request.setup_or_bulk_transfer.size = 0;
vos_dev_ioctl(slaveBomsCtx->handle, &iocb);
// now send the CSW
csw.sig[0]='U';
csw.sig[1]='S';
csw.sig[2]='B';
csw.sig[3]='S';//"USBS"
csw.tag=cbw->tag;
csw.residue=0;
csw.status=0x00; // 0x00=success 0x01=failure 0x02=phase error
forward_csw_to_slave(&csw);
}
void handle_start_stop_unit(boms_cbw_t *cbw)
{
boms_csw_t csw;
// forward the CBW to device
if (forward_cbw_to_device(cbw))
{
// receive response from device
if (receive_csw_from_device(&csw))
{
// forward CSW to slave
forward_csw_to_slave(&csw);
}
}