X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/afdcb8c159a73aba95a017f1cfec98e8fa2b93c1..2bb7f7e327df13f288b2b98a71bb390c516cc982:/client/comms.c diff --git a/client/comms.c b/client/comms.c index abbae386..be0cfd10 100644 --- a/client/comms.c +++ b/client/comms.c @@ -9,34 +9,42 @@ // Code for communicating with the proxmark3 hardware. //----------------------------------------------------------------------------- -#include - #include "comms.h" + +#include +#ifdef __linux__ +#include // for unlink() +#endif #include "uart.h" #include "ui.h" #include "common.h" -#include "data.h" #include "util_posix.h" -// Declare globals. // Serial port that we are communicating with the PM3 on. -static serial_port* port; +static serial_port sp = NULL; +static char *serial_port_name = NULL; // If TRUE, then there is no active connection to the PM3, and we will drop commands sent. static bool offline; +typedef struct { + bool run; // If TRUE, continue running the uart_communication thread + bool block_after_ACK; // if true, block after receiving an ACK package +} communication_arg_t; + +static communication_arg_t conn; +static pthread_t USB_communication_thread; + // Transmit buffer. -// TODO: Use locks and execute this on the main thread, rather than the receiver -// thread. Running on the main thread means we need to be careful in the -// flasher, as it means SendCommand is no longer async, and can't be used as a -// buffer for a pending command when the connection is re-established. -static UsbCommand txcmd; -static bool txcmd_pending; +static UsbCommand txBuffer; +static bool txBuffer_pending = false; +static pthread_mutex_t txBufferMutex = PTHREAD_MUTEX_INITIALIZER; +static pthread_cond_t txBufferSig = PTHREAD_COND_INITIALIZER; // Used by UsbReceiveCommand as a ring buffer for messages that are yet to be // processed by a command handler (WaitForResponse{,Timeout}) -static UsbCommand cmdBuffer[CMD_BUFFER_SIZE]; +static UsbCommand rxBuffer[CMD_BUFFER_SIZE]; // Points to the next empty position to write to static int cmd_head = 0; @@ -44,20 +52,12 @@ static int cmd_head = 0; // Points to the position of the last unread command static int cmd_tail = 0; -// to lock cmdBuffer operations from different threads -static pthread_mutex_t cmdBufferMutex = PTHREAD_MUTEX_INITIALIZER; +// to lock rxBuffer operations from different threads +static pthread_mutex_t rxBufferMutex = PTHREAD_MUTEX_INITIALIZER; // These wrappers are required because it is not possible to access a static // global variable outside of the context of a single file. -void SetSerialPort(serial_port* new_port) { - port = new_port; -} - -serial_port* GetSerialPort() { - return port; -} - void SetOffline(bool new_offline) { offline = new_offline; } @@ -72,19 +72,28 @@ void SendCommand(UsbCommand *c) { #endif if (offline) { - PrintAndLog("Sending bytes to proxmark failed - offline"); - return; + PrintAndLog("Sending bytes to proxmark failed - offline"); + return; } - /** - The while-loop below causes hangups at times, when the pm3 unit is unresponsive - or disconnected. The main console thread is alive, but comm thread just spins here. - Not good.../holiman + + pthread_mutex_lock(&txBufferMutex); + /** + This causes hangups at times, when the pm3 unit is unresponsive or disconnected. The main console thread is alive, + but comm thread just spins here. Not good.../holiman **/ - while(txcmd_pending); - txcmd = *c; - txcmd_pending = true; + while (txBuffer_pending) { + pthread_cond_wait(&txBufferSig, &txBufferMutex); // wait for communication thread to complete sending a previous commmand + } + + txBuffer = *c; + txBuffer_pending = true; + pthread_cond_signal(&txBufferSig); // tell communication thread that a new command can be send + + pthread_mutex_unlock(&txBufferMutex); + } + /** * @brief This method should be called when sending a new command to the pm3. In case any old * responses from previous commands are stored in the buffer, a call to this method should clear them. @@ -94,18 +103,18 @@ void SendCommand(UsbCommand *c) { void clearCommandBuffer() { //This is a very simple operation - pthread_mutex_lock(&cmdBufferMutex); + pthread_mutex_lock(&rxBufferMutex); cmd_tail = cmd_head; - pthread_mutex_unlock(&cmdBufferMutex); + pthread_mutex_unlock(&rxBufferMutex); } /** * @brief storeCommand stores a USB command in a circular buffer * @param UC */ -void storeCommand(UsbCommand *command) +static void storeCommand(UsbCommand *command) { - pthread_mutex_lock(&cmdBufferMutex); + pthread_mutex_lock(&rxBufferMutex); if( (cmd_head+1) % CMD_BUFFER_SIZE == cmd_tail) { // If these two are equal, we're about to overwrite in the @@ -114,11 +123,11 @@ void storeCommand(UsbCommand *command) } // Store the command at the 'head' location - UsbCommand* destination = &cmdBuffer[cmd_head]; + UsbCommand* destination = &rxBuffer[cmd_head]; memcpy(destination, command, sizeof(UsbCommand)); cmd_head = (cmd_head +1) % CMD_BUFFER_SIZE; //increment head and wrap - pthread_mutex_unlock(&cmdBufferMutex); + pthread_mutex_unlock(&rxBufferMutex); } @@ -127,166 +136,240 @@ void storeCommand(UsbCommand *command) * @param response location to write command * @return 1 if response was returned, 0 if nothing has been received */ -int getCommand(UsbCommand* response) +static int getCommand(UsbCommand* response) { - pthread_mutex_lock(&cmdBufferMutex); + pthread_mutex_lock(&rxBufferMutex); //If head == tail, there's nothing to read, or if we just got initialized if (cmd_head == cmd_tail){ - pthread_mutex_unlock(&cmdBufferMutex); + pthread_mutex_unlock(&rxBufferMutex); return 0; } //Pick out the next unread command - UsbCommand* last_unread = &cmdBuffer[cmd_tail]; + UsbCommand* last_unread = &rxBuffer[cmd_tail]; memcpy(response, last_unread, sizeof(UsbCommand)); //Increment tail - this is a circular buffer, so modulo buffer size cmd_tail = (cmd_tail + 1) % CMD_BUFFER_SIZE; - pthread_mutex_unlock(&cmdBufferMutex); + pthread_mutex_unlock(&rxBufferMutex); return 1; } -//----------------------------------------------------------------------------- -// Entry point into our code: called whenever we received a packet over USB -// that we weren't necessarily expecting, for example a debug print. -//----------------------------------------------------------------------------- -void UsbCommandReceived(UsbCommand *UC) + +//---------------------------------------------------------------------------------- +// Entry point into our code: called whenever we received a packet over USB. +// Handle debug commands directly, store all other commands in circular buffer. +//---------------------------------------------------------------------------------- +static void UsbCommandReceived(UsbCommand *UC) { switch(UC->cmd) { - - // First check if we are handling a debug message - case CMD_DEBUG_PRINT_STRING: { - char s[USB_CMD_DATA_SIZE+1]; - memset(s, 0x00, sizeof(s)); - size_t len = MIN(UC->arg[0],USB_CMD_DATA_SIZE); - memcpy(s,UC->d.asBytes,len); - PrintAndLog("#db# %s", s); - return; - } - - case CMD_DEBUG_PRINT_INTEGERS: { - PrintAndLog("#db# %08x, %08x, %08x \r\n", UC->arg[0], UC->arg[1], UC->arg[2]); - return; - } - - case CMD_DOWNLOADED_RAW_ADC_SAMPLES_125K: { - // FIXME: This does unsanitised copies into memory when we don't know - // the size of the buffer. - if (sample_buf) { - memcpy(sample_buf+(UC->arg[0]),UC->d.asBytes,UC->arg[1]); - } - return; + // First check if we are handling a debug message + case CMD_DEBUG_PRINT_STRING: { + char s[USB_CMD_DATA_SIZE+1]; + memset(s, 0x00, sizeof(s)); + size_t len = MIN(UC->arg[0],USB_CMD_DATA_SIZE); + memcpy(s,UC->d.asBytes,len); + PrintAndLog("#db# %s", s); + return; + } break; + + case CMD_DEBUG_PRINT_INTEGERS: { + PrintAndLog("#db# %08x, %08x, %08x \r\n", UC->arg[0], UC->arg[1], UC->arg[2]); + return; + } break; + + default: + storeCommand(UC); + break; } - default: { - storeCommand(UC); - return; - } - } } -// Gets a single command from a proxmark3 device. This should never be used -// with the full client. -// -// @param conn A receiver_arg structure. -// @param command A buffer to store the received command. -bool ReceiveCommand(receiver_arg* conn, UsbCommand* command) { - // Local recieve buffer + +static void +#ifdef __has_attribute +#if __has_attribute(force_align_arg_pointer) +__attribute__((force_align_arg_pointer)) +#endif +#endif +*uart_communication(void *targ) { + communication_arg_t *conn = (communication_arg_t*)targ; size_t rxlen; - byte_t rx[sizeof(UsbCommand)]; - byte_t* prx = rx; + UsbCommand rx; + UsbCommand *prx = ℞ while (conn->run) { rxlen = 0; - if (uart_receive(port, prx, sizeof(UsbCommand) - (prx-rx), &rxlen) && rxlen) { + bool ACK_received = false; + if (uart_receive(sp, (uint8_t *)prx, sizeof(UsbCommand) - (prx-&rx), &rxlen) && rxlen) { prx += rxlen; - if (prx-rx < sizeof(UsbCommand)) { - // Keep reading until we have a completed response. + if (prx-&rx < sizeof(UsbCommand)) { continue; } - - // We have a completed response. - memcpy(command, rx, sizeof(UsbCommand)); - return true; + UsbCommandReceived(&rx); + if (rx.cmd == CMD_ACK) { + ACK_received = true; + } } + prx = ℞ - if (prx == rx) { - // We got no complete command while waiting, give up control - return false; + + pthread_mutex_lock(&txBufferMutex); + + if (conn->block_after_ACK) { + // if we just received an ACK, wait here until a new command is to be transmitted + if (ACK_received) { + while (!txBuffer_pending) { + pthread_cond_wait(&txBufferSig, &txBufferMutex); + } + } + } + + if(txBuffer_pending) { + if (!uart_send(sp, (uint8_t*) &txBuffer, sizeof(UsbCommand))) { + PrintAndLog("Sending bytes to proxmark failed"); + } + txBuffer_pending = false; + pthread_cond_signal(&txBufferSig); // tell main thread that txBuffer is empty } + + pthread_mutex_unlock(&txBufferMutex); } - // did not get a complete command before being cancelled. - return false; + pthread_exit(NULL); + return NULL; } -// Worker thread for processing incoming events from the PM3 -void *uart_receiver(void *targ) { - receiver_arg *conn = (receiver_arg*)targ; - UsbCommand rx; - while (conn->run) { - #ifdef COMMS_DEBUG - printf("uart_receiver: get lock\n"); - #endif - // Lock up receives, in case they try to take it away from us. - pthread_mutex_lock(&conn->recv_lock); - #ifdef COMMS_DEBUG - printf("uart_receiver: lock acquired\n"); - #endif - - if (port == NULL) { - #ifdef COMMS_DEBUG - printf("uart_receiver: port disappeared\n"); - #endif - // Our port disappeared, stall. This code path matters for the flasher, - // where it is fiddling with the serial port under us. - pthread_mutex_unlock(&conn->recv_lock); - msleep(10); - continue; - } +/** + * Data transfer from Proxmark to client. This method times out after + * ms_timeout milliseconds. + * @brief GetFromBigBuf + * @param dest Destination address for transfer + * @param bytes number of bytes to be transferred + * @param start_index offset into Proxmark3 BigBuf[] + * @param response struct to copy last command (CMD_ACK) into + * @param ms_timeout timeout in milliseconds + * @param show_warning display message after 2 seconds + * @return true if command was returned, otherwise false + */ +bool GetFromBigBuf(uint8_t *dest, int bytes, int start_index, UsbCommand *response, size_t ms_timeout, bool show_warning) +{ + UsbCommand c = {CMD_DOWNLOAD_RAW_ADC_SAMPLES_125K, {start_index, bytes, 0}}; + SendCommand(&c); - bool got_command = ReceiveCommand(conn, &rx); - #ifdef COMMS_DEBUG - printf("uart_receiver: got command\n"); - #endif - pthread_mutex_unlock(&conn->recv_lock); + uint64_t start_time = msclock(); - if (got_command) { - UsbCommandReceived(&rx); - } + UsbCommand resp; + if (response == NULL) { + response = &resp; + } - // We aren't normally trying to transmit in the flasher when the port would - // be reset, so we can just keep going at this point. - if (txcmd_pending) { - if (!uart_send(port, (byte_t*) &txcmd, sizeof(UsbCommand))) { - PrintAndLog("Sending bytes to proxmark failed"); + int bytes_completed = 0; + while(true) { + if (getCommand(response)) { + if (response->cmd == CMD_DOWNLOADED_RAW_ADC_SAMPLES_125K) { + int copy_bytes = MIN(bytes - bytes_completed, response->arg[1]); + memcpy(dest + response->arg[0], response->d.asBytes, copy_bytes); + bytes_completed += copy_bytes; + } else if (response->cmd == CMD_ACK) { + return true; } - txcmd_pending = false; + } + + if (msclock() - start_time > ms_timeout) { + break; + } + + if (msclock() - start_time > 2000 && show_warning) { + PrintAndLog("Waiting for a response from the proxmark..."); + PrintAndLog("You can cancel this operation by pressing the pm3 button"); + show_warning = false; } } - pthread_exit(NULL); - return NULL; + return false; } + +bool OpenProxmark(void *port, bool wait_for_port, int timeout, bool flash_mode) { + char *portname = (char *)port; + if (!wait_for_port) { + sp = uart_open(portname); + } else { + printf("Waiting for Proxmark to appear on %s ", portname); + fflush(stdout); + int openCount = 0; + do { + sp = uart_open(portname); + msleep(1000); + printf("."); + fflush(stdout); + } while(++openCount < timeout && (sp == INVALID_SERIAL_PORT || sp == CLAIMED_SERIAL_PORT)); + printf("\n"); + } + + // check result of uart opening + if (sp == INVALID_SERIAL_PORT) { + printf("ERROR: invalid serial port\n"); + sp = NULL; + serial_port_name = NULL; + return false; + } else if (sp == CLAIMED_SERIAL_PORT) { + printf("ERROR: serial port is claimed by another process\n"); + sp = NULL; + serial_port_name = NULL; + return false; + } else { + // start the USB communication thread + serial_port_name = portname; + conn.run = true; + conn.block_after_ACK = flash_mode; + pthread_create(&USB_communication_thread, NULL, &uart_communication, &conn); + return true; + } +} + + +void CloseProxmark(void) { + conn.run = false; + pthread_join(USB_communication_thread, NULL); + + if (sp) { + uart_close(sp); + } + +#ifdef __linux__ + // Fix for linux, it seems that it is extremely slow to release the serial port file descriptor /dev/* + if (serial_port_name) { + unlink(serial_port_name); + } +#endif + + // Clean up our state + sp = NULL; + serial_port_name = NULL; +} + + /** * Waits for a certain response type. This method waits for a maximum of * ms_timeout milliseconds for a specified response command. *@brief WaitForResponseTimeout - * @param cmd command to wait for, or CMD_ANY to take any command. + * @param cmd command to wait for, or CMD_UNKNOWN to take any command. * @param response struct to copy received command into. * @param ms_timeout - * @param show_warning + * @param show_warning display message after 2 seconds * @return true if command was returned, otherwise false */ -bool WaitForResponseTimeoutW(uint64_t cmd, UsbCommand* response, size_t ms_timeout, bool show_warning) { +bool WaitForResponseTimeoutW(uint32_t cmd, UsbCommand* response, size_t ms_timeout, bool show_warning) { + UsbCommand resp; #ifdef COMMS_DEBUG printf("Waiting for %04x cmd\n", cmd); #endif - + if (response == NULL) { response = &resp; } @@ -294,32 +377,33 @@ bool WaitForResponseTimeoutW(uint64_t cmd, UsbCommand* response, size_t ms_timeo uint64_t start_time = msclock(); // Wait until the command is received - for (;;) { + while (true) { while(getCommand(response)) { - if (cmd == CMD_ANY || response->cmd == cmd) { + if (cmd == CMD_UNKNOWN || response->cmd == cmd) { return true; } } - + if (msclock() - start_time > ms_timeout) { - // We timed out. break; } - + if (msclock() - start_time > 2000 && show_warning) { // 2 seconds elapsed (but this doesn't mean the timeout was exceeded) PrintAndLog("Waiting for a response from the proxmark..."); - PrintAndLog("Don't forget to cancel its operation first by pressing on the button"); - break; + PrintAndLog("You can cancel this operation by pressing the pm3 button"); + show_warning = false; } } return false; } -bool WaitForResponseTimeout(uint64_t cmd, UsbCommand* response, size_t ms_timeout) { + +bool WaitForResponseTimeout(uint32_t cmd, UsbCommand* response, size_t ms_timeout) { return WaitForResponseTimeoutW(cmd, response, ms_timeout, true); } -bool WaitForResponse(uint64_t cmd, UsbCommand* response) { - return WaitForResponseTimeout(cmd, response, -1); +bool WaitForResponse(uint32_t cmd, UsbCommand* response) { + return WaitForResponseTimeoutW(cmd, response, -1, true); } +