mirror of
https://github.com/RfidResearchGroup/proxmark3.git
synced 2024-12-26 18:12:34 +08:00
Finally figured out a way to claim a serial port interface under unix
This commit is contained in:
roel@libnfc.org
parent
4a049b7847
commit
62ee4fedd5
2 changed files with 179 additions and 65 deletions
234
client/uart.c
234
client/uart.c
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@ -50,85 +50,193 @@ const struct timeval timeout = {
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.tv_usec = 30000 // 30000 micro seconds
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};
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// Work-around to claim uart interface using the c_iflag (software input processing) from the termios struct
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#define CCLAIMED 0x00008000
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char pcPort[255];
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serial_port uart_open(const char* pcPortName)
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{
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serial_port_unix* sp = malloc(sizeof(serial_port_unix));
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strcpy(pcPort,pcPortName);
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if (sp == 0) return INVALID_SERIAL_PORT;
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sp->fd = open(pcPortName, O_RDWR | O_NOCTTY | O_NDELAY | O_NONBLOCK);
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if(sp->fd == -1)
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{
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if(sp->fd == -1) {
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uart_close(sp);
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return INVALID_SERIAL_PORT;
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}
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// Finally figured out a way to claim a serial port interface under unix
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// We just try to set a (advisory) lock on the file descriptor
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struct flock fl;
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fl.l_type = F_WRLCK;
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fl.l_whence = SEEK_SET;
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fl.l_start = 0;
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fl.l_len = 0;
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fl.l_pid = getpid();
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if(tcgetattr(sp->fd,&sp->tiOld) == -1)
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{
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uart_close(sp);
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return INVALID_SERIAL_PORT;
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}
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// Make sure the port is not claimed already
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if (sp->tiOld.c_iflag & CCLAIMED)
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{
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uart_close(sp);
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// Does the system allows us to place a lock on this file descriptor
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if (fcntl(sp->fd, F_SETLK, &fl) == -1) {
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// A conflicting lock is held by another process
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return CLAIMED_SERIAL_PORT;
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}
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// Copy the old terminal info struct
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sp->tiNew = sp->tiOld;
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sp->tiNew.c_cflag = CS8 | CLOCAL | CREAD;
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sp->tiNew.c_iflag = CCLAIMED | IGNPAR;
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sp->tiNew.c_oflag = 0;
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sp->tiNew.c_lflag = 0;
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// Set serial port equivalent to raw mode
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// sp->tiNew.c_iflag &= ~(CCLAIMED | IGNBRK | BRKINT | IGNPAR | ISTRIP | INLCR | IGNCR | ICRNL | IXON);
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// sp->tiNew.c_oflag &= ~OPOST;
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// sp->tiNew.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
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// sp->tiNew.c_cflag &= ~(CSIZE | PARENB | CS8 | CLOCAL | CREAD);
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sp->tiNew.c_cc[VMIN] = 0; // block until n bytes are received
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sp->tiNew.c_cc[VTIME] = 0; // block until a timer expires (n * 100 mSec.)
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if(tcsetattr(sp->fd,TCSANOW,&sp->tiNew) == -1)
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{
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// Try to retrieve the old (current) terminal info struct
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if(tcgetattr(sp->fd,&sp->tiOld) == -1) {
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uart_close(sp);
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return INVALID_SERIAL_PORT;
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}
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// Duplicate the (old) terminal info struct
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sp->tiNew = sp->tiOld;
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// Configure the serial port
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sp->tiNew.c_cflag = CS8 | CLOCAL | CREAD;
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sp->tiNew.c_iflag = IGNPAR;
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sp->tiNew.c_oflag = 0;
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sp->tiNew.c_lflag = 0;
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// Block until n bytes are received
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sp->tiNew.c_cc[VMIN] = 0;
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// Block until a timer expires (n * 100 mSec.)
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sp->tiNew.c_cc[VTIME] = 0;
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// Try to set the new terminal info struct
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if(tcsetattr(sp->fd,TCSANOW,&sp->tiNew) == -1) {
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uart_close(sp);
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return INVALID_SERIAL_PORT;
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}
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// Flush all lingering data that may exist
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tcflush(sp->fd, TCIOFLUSH);
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return sp;
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}
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void uart_close(const serial_port sp) {
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serial_port_unix* spu = (serial_port_unix*)sp;
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tcflush(spu->fd,TCIOFLUSH);
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tcsetattr(spu->fd,TCSANOW,&(spu->tiOld));
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struct flock fl;
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fl.l_type = F_UNLCK;
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fl.l_whence = SEEK_SET;
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fl.l_start = 0;
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fl.l_len = 0;
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fl.l_pid = getpid();
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fcntl(spu->fd, F_SETLK, &fl);
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close(spu->fd);
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free(sp);
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}
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bool uart_set_speed(serial_port sp, const uint32_t uiPortSpeed) {
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// Set port speed (Input and Output)
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const serial_port_unix* spu = (serial_port_unix*)sp;
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cfsetispeed((struct termios*)&spu->tiNew, uiPortSpeed);
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cfsetospeed((struct termios*)&spu->tiNew, uiPortSpeed);
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return (tcsetattr(spu->fd, TCSADRAIN, &spu->tiNew) != -1);
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speed_t stPortSpeed;
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switch (uiPortSpeed) {
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case 0: stPortSpeed = B0; break;
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case 50: stPortSpeed = B50; break;
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case 75: stPortSpeed = B75; break;
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case 110: stPortSpeed = B110; break;
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case 134: stPortSpeed = B134; break;
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case 150: stPortSpeed = B150; break;
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case 300: stPortSpeed = B300; break;
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case 600: stPortSpeed = B600; break;
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case 1200: stPortSpeed = B1200; break;
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case 1800: stPortSpeed = B1800; break;
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case 2400: stPortSpeed = B2400; break;
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case 4800: stPortSpeed = B4800; break;
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case 9600: stPortSpeed = B9600; break;
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case 19200: stPortSpeed = B19200; break;
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case 38400: stPortSpeed = B38400; break;
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# ifdef B57600
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case 57600: stPortSpeed = B57600; break;
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# endif
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# ifdef B115200
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case 115200: stPortSpeed = B115200; break;
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# endif
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# ifdef B230400
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case 230400: stPortSpeed = B230400; break;
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# endif
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# ifdef B460800
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case 460800: stPortSpeed = B460800; break;
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# endif
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# ifdef B921600
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case 921600: stPortSpeed = B921600; break;
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# endif
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default: return false;
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};
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struct termios ti;
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if (tcgetattr(spu->fd,&ti) == -1) return false;
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// Set port speed (Input and Output)
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cfsetispeed(&ti,stPortSpeed);
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cfsetospeed(&ti,stPortSpeed);
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return (tcsetattr(spu->fd,TCSANOW,&ti) != -1);
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}
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uint32_t uart_get_speed(const serial_port sp) {
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uint32_t uiPortSpeed = 0;
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struct termios ti;
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uint32_t uiPortSpeed;
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const serial_port_unix* spu = (serial_port_unix*)sp;
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uiPortSpeed = cfgetispeed(&spu->tiNew);
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if (tcgetattr(spu->fd,&ti) == -1) return 0;
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// Set port speed (Input)
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speed_t stPortSpeed = cfgetispeed(&ti);
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switch (stPortSpeed) {
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case B0: uiPortSpeed = 0; break;
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case B50: uiPortSpeed = 50; break;
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case B75: uiPortSpeed = 75; break;
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case B110: uiPortSpeed = 110; break;
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case B134: uiPortSpeed = 134; break;
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case B150: uiPortSpeed = 150; break;
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case B300: uiPortSpeed = 300; break;
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case B600: uiPortSpeed = 600; break;
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case B1200: uiPortSpeed = 1200; break;
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case B1800: uiPortSpeed = 1800; break;
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case B2400: uiPortSpeed = 2400; break;
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case B4800: uiPortSpeed = 4800; break;
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case B9600: uiPortSpeed = 9600; break;
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case B19200: uiPortSpeed = 19200; break;
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case B38400: uiPortSpeed = 38400; break;
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# ifdef B57600
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case B57600: uiPortSpeed = 57600; break;
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# endif
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# ifdef B115200
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case B115200: uiPortSpeed = 115200; break;
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# endif
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# ifdef B230400
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case B230400: uiPortSpeed = 230400; break;
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# endif
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# ifdef B460800
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case B460800: uiPortSpeed = 460800; break;
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# endif
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# ifdef B921600
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case B921600: uiPortSpeed = 921600; break;
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# endif
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default: return 0;
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};
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return uiPortSpeed;
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}
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void uart_close(const serial_port sp) {
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tcflush(((serial_port_unix*)sp)->fd,TCIOFLUSH);
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tcsetattr(((serial_port_unix*)sp)->fd,TCSANOW,&((serial_port_unix*)sp)->tiOld);
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close(((serial_port_unix*)sp)->fd);
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free(sp);
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bool uart_set_parity(serial_port sp, serial_port_parity spp) {
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struct termios ti;
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const serial_port_unix* spu = (serial_port_unix*)sp;
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if (tcgetattr(spu->fd,&ti) == -1) return false;
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switch(spp) {
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case SP_INVALID: return false;
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case SP_NONE: ti.c_cflag &= ~(PARENB | PARODD); break;
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case SP_EVEN: ti.c_cflag |= PARENB; ti.c_cflag &= ~(PARODD); break;
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case SP_ODD: ti.c_cflag |= PARENB | PARODD; break;
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}
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return (tcsetattr(spu->fd,TCSANOW,&ti) != -1);
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}
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serial_port_parity uart_get_parity(const serial_port sp) {
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struct termios ti;
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const serial_port_unix* spu = (serial_port_unix*)sp;
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if (tcgetattr(spu->fd,&ti) == -1) return SP_INVALID;
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if (ti.c_cflag & PARENB) {
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if (ti.c_cflag & PARODD) {
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return SP_ODD;
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} else {
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return SP_EVEN;
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}
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} else {
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return SP_NONE;
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}
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}
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bool uart_cts(const serial_port sp) {
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@ -138,6 +246,7 @@ bool uart_cts(const serial_port sp) {
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}
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bool uart_receive(const serial_port sp, byte_t* pbtRx, size_t* pszRxLen) {
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int res;
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int byteCount;
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fd_set rfds;
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@ -192,8 +301,7 @@ bool uart_send(const serial_port sp, const byte_t* pbtTx, const size_t szTxLen)
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fd_set rfds;
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struct timeval tv;
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while (szPos < szTxLen)
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{
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while (szPos < szTxLen) {
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// Reset file descriptor
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FD_ZERO(&rfds);
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FD_SET(((serial_port_unix*)sp)->fd,&rfds);
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@ -231,12 +339,12 @@ typedef struct {
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} serial_port_windows;
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void upcase(char *p) {
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while(*p != '\0') {
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if(*p >= 97 && *p <= 122) {
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*p -= 32;
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while(*p != '\0') {
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if(*p >= 97 && *p <= 122) {
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*p -= 32;
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}
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++p;
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}
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++p;
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}
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}
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serial_port uart_open(const char* pcPortName) {
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@ -249,8 +357,7 @@ serial_port uart_open(const char* pcPortName) {
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// Try to open the serial port
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sp->hPort = CreateFileA(acPortName,GENERIC_READ|GENERIC_WRITE,0,NULL,OPEN_EXISTING,0,NULL);
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if (sp->hPort == INVALID_HANDLE_VALUE)
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{
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if (sp->hPort == INVALID_HANDLE_VALUE) {
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uart_close(sp);
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return INVALID_SERIAL_PORT;
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}
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@ -258,15 +365,13 @@ serial_port uart_open(const char* pcPortName) {
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// Prepare the device control
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memset(&sp->dcb, 0, sizeof(DCB));
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sp->dcb.DCBlength = sizeof(DCB);
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if(!BuildCommDCBA("baud=9600 data=8 parity=N stop=1",&sp->dcb))
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{
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if(!BuildCommDCBA("baud=9600 data=8 parity=N stop=1",&sp->dcb)) {
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uart_close(sp);
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return INVALID_SERIAL_PORT;
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}
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// Update the active serial port
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if(!SetCommState(sp->hPort,&sp->dcb))
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{
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if(!SetCommState(sp->hPort,&sp->dcb)) {
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uart_close(sp);
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return INVALID_SERIAL_PORT;
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}
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@ -277,8 +382,7 @@ serial_port uart_open(const char* pcPortName) {
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sp->ct.WriteTotalTimeoutMultiplier = 0;
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sp->ct.WriteTotalTimeoutConstant = 30;
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if(!SetCommTimeouts(sp->hPort,&sp->ct))
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{
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if(!SetCommTimeouts(sp->hPort,&sp->ct)) {
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uart_close(sp);
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return INVALID_SERIAL_PORT;
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}
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@ -58,6 +58,13 @@ typedef unsigned char byte_t;
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#include <windows.h>
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#endif
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typedef enum {
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SP_INVALID = 0x00, // invalid value, error occured
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SP_NONE = 0x01, // no parity (default)
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SP_EVEN = 0x02, // even parity
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SP_ODD = 0x03 // odd parity
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} serial_port_parity;
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// Define shortcut to types to make code more readable
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typedef void* serial_port;
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#define INVALID_SERIAL_PORT (void*)(~1)
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@ -69,6 +76,9 @@ void uart_close(const serial_port sp);
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bool uart_set_speed(serial_port sp, const uint32_t uiPortSpeed);
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uint32_t uart_get_speed(const serial_port sp);
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bool uart_set_parity(serial_port sp, serial_port_parity spp);
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serial_port_parity uart_get_parity(const serial_port sp);
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bool uart_receive(const serial_port sp, byte_t* pbtRx, size_t* pszRxLen);
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bool uart_send(const serial_port sp, const byte_t* pbtTx, const size_t szTxLen);
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