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proxmark3/uart/uart_posix.c
Philippe Teuwen 7effdfc275 style
2019-04-05 23:29:19 +02:00

501 lines
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/*
* Generic uart / rs232/ serial port library
*
* Copyright (c) 2013, Roel Verdult
* Copyright (c) 2018 Google
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holders nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* @file uart_posix.c
*
* This version of the library has functionality removed which was not used by
* proxmark3 project.
*/
// Test if we are dealing with posix operating systems
#ifndef _WIN32
#define _DEFAULT_SOURCE
#include "uart.h"
#include <termios.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <limits.h>
#include <sys/time.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <netdb.h>
// Taken from https://github.com/unbit/uwsgi/commit/b608eb1772641d525bfde268fe9d6d8d0d5efde7
#ifndef SOL_TCP
# define SOL_TCP IPPROTO_TCP
#endif
typedef struct termios term_info;
typedef struct {
int fd; // Serial port file descriptor
term_info tiOld; // Terminal info before using the port
term_info tiNew; // Terminal info during the transaction
} serial_port_unix;
// Set time-out on 30 miliseconds
struct timeval timeout = {
.tv_sec = 0, // 0 second
.tv_usec = 30000 // 30 000 micro seconds
};
serial_port uart_open(const char *pcPortName, uint32_t speed) {
serial_port_unix *sp = calloc(sizeof(serial_port_unix), sizeof(uint8_t));
if (sp == 0) return INVALID_SERIAL_PORT;
if (memcmp(pcPortName, "tcp:", 4) == 0) {
struct addrinfo *addr, *rp;
char *addrstr = strdup(pcPortName + 4);
if (addrstr == NULL) {
printf("Error: strdup\n");
free(sp);
return INVALID_SERIAL_PORT;
}
timeout.tv_usec = 300000; // 300 000 micro seconds
char *colon = strrchr(addrstr, ':');
char *portstr;
if (colon) {
portstr = colon + 1;
*colon = '\0';
} else {
portstr = "7901";
}
int s = getaddrinfo(addrstr, portstr, NULL, &addr);
if (s != 0) {
printf("Error: getaddrinfo: %s\n", gai_strerror(s));
freeaddrinfo(addr);
free(addrstr);
free(sp);
return INVALID_SERIAL_PORT;
}
int sfd;
for (rp = addr; rp != NULL; rp = rp->ai_next) {
sfd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
if (sfd == -1)
continue;
if (connect(sfd, rp->ai_addr, rp->ai_addrlen) != -1)
break;
close(sfd);
}
if (rp == NULL) { /* No address succeeded */
printf("Error: Could not connect\n");
freeaddrinfo(addr);
free(addrstr);
free(sp);
return INVALID_SERIAL_PORT;
}
freeaddrinfo(addr);
free(addrstr);
sp->fd = sfd;
int one = 1;
int res = setsockopt(sp->fd, SOL_TCP, TCP_NODELAY, &one, sizeof(one));
if (res != 0) {
free(sp);
return INVALID_SERIAL_PORT;
}
return sp;
}
sp->fd = open(pcPortName, O_RDWR | O_NOCTTY | O_NDELAY | O_NONBLOCK);
if (sp->fd == -1) {
uart_close(sp);
return INVALID_SERIAL_PORT;
}
// Finally figured out a way to claim a serial port interface under unix
// We just try to set a (advisory) lock on the file descriptor
struct flock fl;
fl.l_type = F_WRLCK;
fl.l_whence = SEEK_SET;
fl.l_start = 0;
fl.l_len = 0;
fl.l_pid = getpid();
// Does the system allows us to place a lock on this file descriptor
if (fcntl(sp->fd, F_SETLK, &fl) == -1) {
// A conflicting lock is held by another process
free(sp);
return CLAIMED_SERIAL_PORT;
}
// Try to retrieve the old (current) terminal info struct
if (tcgetattr(sp->fd, &sp->tiOld) == -1) {
uart_close(sp);
return INVALID_SERIAL_PORT;
}
// Duplicate the (old) terminal info struct
sp->tiNew = sp->tiOld;
// Configure the serial port
sp->tiNew.c_cflag = CS8 | CLOCAL | CREAD;
sp->tiNew.c_iflag = IGNPAR;
sp->tiNew.c_oflag = 0;
sp->tiNew.c_lflag = 0;
// Block until n bytes are received
sp->tiNew.c_cc[VMIN] = 0;
// Block until a timer expires (n * 100 mSec.)
sp->tiNew.c_cc[VTIME] = 0;
// Try to set the new terminal info struct
if (tcsetattr(sp->fd, TCSANOW, &sp->tiNew) == -1) {
uart_close(sp);
return INVALID_SERIAL_PORT;
}
// Flush all lingering data that may exist
tcflush(sp->fd, TCIOFLUSH);
if (!uart_set_speed(sp, speed)) {
// trying some fallbacks automatically
speed = 115200;
if (!uart_set_speed(sp, speed)) {
speed = 9600;
if (!uart_set_speed(sp, speed)) {
uart_close(sp);
printf("[!] UART error while setting baudrate\n");
return INVALID_SERIAL_PORT;
}
}
}
printf("[=] UART Setting serial baudrate %u\n", speed);
return sp;
}
void uart_close(const serial_port sp) {
serial_port_unix *spu = (serial_port_unix *)sp;
tcflush(spu->fd, TCIOFLUSH);
tcsetattr(spu->fd, TCSANOW, &(spu->tiOld));
struct flock fl;
fl.l_type = F_UNLCK;
fl.l_whence = SEEK_SET;
fl.l_start = 0;
fl.l_len = 0;
fl.l_pid = getpid();
// Does the system allows us to place a lock on this file descriptor
int err = fcntl(spu->fd, F_SETLK, &fl);
if (err == -1) {
//perror("fcntl");
}
close(spu->fd);
free(sp);
}
bool uart_receive(const serial_port sp, uint8_t *pbtRx, size_t pszMaxRxLen, size_t *pszRxLen) {
int byteCount;
fd_set rfds;
struct timeval tv;
// Reset the output count
*pszRxLen = 0;
do {
// Reset file descriptor
FD_ZERO(&rfds);
FD_SET(((serial_port_unix *)sp)->fd, &rfds);
tv = timeout;
int res = select(((serial_port_unix *)sp)->fd + 1, &rfds, NULL, NULL, &tv);
// Read error
if (res < 0) {
return false;
}
// Read time-out
if (res == 0) {
if (*pszRxLen == 0) {
// Error, we received no data
return false;
} else {
// We received some data, but nothing more is available
return true;
}
}
// Retrieve the count of the incoming bytes
res = ioctl(((serial_port_unix *)sp)->fd, FIONREAD, &byteCount);
if (res < 0) return false;
// Cap the number of bytes, so we don't overrun the buffer
if (pszMaxRxLen - (*pszRxLen) < byteCount) {
byteCount = pszMaxRxLen - (*pszRxLen);
}
// There is something available, read the data
res = read(((serial_port_unix *)sp)->fd, pbtRx + (*pszRxLen), byteCount);
// Stop if the OS has some troubles reading the data
if (res <= 0) return false;
*pszRxLen += res;
if (*pszRxLen == pszMaxRxLen) {
// We have all the data we wanted.
return true;
}
} while (byteCount);
return true;
}
bool uart_send(const serial_port sp, const uint8_t *pbtTx, const size_t len) {
size_t pos = 0;
fd_set rfds;
struct timeval tv;
while (pos < len) {
// Reset file descriptor
FD_ZERO(&rfds);
FD_SET(((serial_port_unix *)sp)->fd, &rfds);
tv = timeout;
int res = select(((serial_port_unix *)sp)->fd + 1, NULL, &rfds, NULL, &tv);
// Write error
if (res < 0) {
printf("UART:: write error (%d)\n", res);
return false;
}
// Write time-out
if (res == 0) {
printf("UART:: write time-out\n");
return false;
}
// Send away the bytes
res = write(((serial_port_unix *)sp)->fd, pbtTx + pos, len - pos);
// Stop if the OS has some troubles sending the data
if (res <= 0) return false;
pos += res;
}
return true;
}
bool uart_set_speed(serial_port sp, const uint32_t uiPortSpeed) {
const serial_port_unix *spu = (serial_port_unix *)sp;
speed_t stPortSpeed;
switch (uiPortSpeed) {
case 0:
stPortSpeed = B0;
break;
case 50:
stPortSpeed = B50;
break;
case 75:
stPortSpeed = B75;
break;
case 110:
stPortSpeed = B110;
break;
case 134:
stPortSpeed = B134;
break;
case 150:
stPortSpeed = B150;
break;
case 300:
stPortSpeed = B300;
break;
case 600:
stPortSpeed = B600;
break;
case 1200:
stPortSpeed = B1200;
break;
case 1800:
stPortSpeed = B1800;
break;
case 2400:
stPortSpeed = B2400;
break;
case 4800:
stPortSpeed = B4800;
break;
case 9600:
stPortSpeed = B9600;
break;
case 19200:
stPortSpeed = B19200;
break;
case 38400:
stPortSpeed = B38400;
break;
# ifdef B57600
case 57600:
stPortSpeed = B57600;
break;
# endif
# ifdef B115200
case 115200:
stPortSpeed = B115200;
break;
# endif
# ifdef B230400
case 230400:
stPortSpeed = B230400;
break;
# endif
# ifdef B460800
case 460800:
stPortSpeed = B460800;
break;
# endif
# ifdef B921600
case 921600:
stPortSpeed = B921600;
break;
# endif
default:
return false;
};
struct termios ti;
if (tcgetattr(spu->fd, &ti) == -1)
return false;
// Set port speed (Input and Output)
cfsetispeed(&ti, stPortSpeed);
cfsetospeed(&ti, stPortSpeed);
return (tcsetattr(spu->fd, TCSANOW, &ti) != -1);
}
uint32_t uart_get_speed(const serial_port sp) {
struct termios ti;
uint32_t uiPortSpeed;
const serial_port_unix *spu = (serial_port_unix *)sp;
if (tcgetattr(spu->fd, &ti) == -1)
return 0;
// Set port speed (Input)
speed_t stPortSpeed = cfgetispeed(&ti);
switch (stPortSpeed) {
case B0:
uiPortSpeed = 0;
break;
case B50:
uiPortSpeed = 50;
break;
case B75:
uiPortSpeed = 75;
break;
case B110:
uiPortSpeed = 110;
break;
case B134:
uiPortSpeed = 134;
break;
case B150:
uiPortSpeed = 150;
break;
case B300:
uiPortSpeed = 300;
break;
case B600:
uiPortSpeed = 600;
break;
case B1200:
uiPortSpeed = 1200;
break;
case B1800:
uiPortSpeed = 1800;
break;
case B2400:
uiPortSpeed = 2400;
break;
case B4800:
uiPortSpeed = 4800;
break;
case B9600:
uiPortSpeed = 9600;
break;
case B19200:
uiPortSpeed = 19200;
break;
case B38400:
uiPortSpeed = 38400;
break;
# ifdef B57600
case B57600:
uiPortSpeed = 57600;
break;
# endif
# ifdef B115200
case B115200:
uiPortSpeed = 115200;
break;
# endif
# ifdef B230400
case B230400:
uiPortSpeed = 230400;
break;
# endif
# ifdef B460800
case B460800:
uiPortSpeed = 460800;
break;
# endif
# ifdef B921600
case B921600:
uiPortSpeed = 921600;
break;
# endif
default:
return 0;
};
return uiPortSpeed;
}
#endif
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