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proxmark3/uart/uart_posix.c
pwpiwi d2ca5dbfe8 uart_posix.c rework 
* added some LED handling in appmain.c (helped with debugging)
* finally replaced the infamous device unlink by msleep(1000)
* fixed some format strings in comms.c (with -DCOMMS_DEBUG)
* made uart_receive() and uart_send() behave as described in header
* some formating
2020-01-27 14:14:40 -05:00

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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 <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdbool.h>
#include <termios.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <netinet/tcp.h>
#include <netdb.h>
#include <sys/time.h>
#include <errno.h>
// Fix missing definition on OS X.
// 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
static struct timeval timeout = {
.tv_sec = 0, // 0 second
.tv_usec = 30000 // 30000 micro seconds
};
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();
fcntl(spu->fd, F_SETLK, &fl);
close(spu->fd);
free(sp);
}
serial_port uart_open(const char* pcPortName) {
serial_port_unix* sp = malloc(sizeof(serial_port_unix));
if (sp == 0) return INVALID_SERIAL_PORT;
if (memcmp(pcPortName, "tcp:", 4) == 0) {
struct addrinfo *addr = NULL, *rp;
char *addrstr = strdup(pcPortName + 4);
if (addrstr == NULL) {
printf("Error: strdup\n");
return INVALID_SERIAL_PORT;
}
char *colon = strrchr(addrstr, ':');
char *portstr;
// Set time-out to 300 milliseconds only for TCP port
timeout.tv_usec = 300000;
if (colon) {
portstr = colon + 1;
*colon = '\0';
} else {
portstr = "7901";
}
struct addrinfo info;
memset(&info, 0, sizeof(info));
info.ai_socktype = SOCK_STREAM;
int s = getaddrinfo(addrstr, portstr, &info, &addr);
if (s != 0) {
printf("Error: getaddrinfo: %s\n", gai_strerror(s));
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");
return INVALID_SERIAL_PORT;
}
freeaddrinfo(addr);
free(addrstr);
sp->fd = sfd;
int one = 1;
setsockopt(sp->fd, SOL_TCP, TCP_NODELAY, &one, sizeof(one));
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 &= ~(CSIZE | PARENB);
sp->tiNew.c_cflag |= (CS8 | CLOCAL | CREAD);
sp->tiNew.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IXON);
sp->tiNew.c_iflag |= IGNPAR;
sp->tiNew.c_oflag &= ~OPOST;
sp->tiNew.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
// 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);
return sp;
}
bool uart_receive(const serial_port sp, uint8_t* pbtRx, size_t szMaxRxLen, size_t* pszRxLen) {
*pszRxLen = 0;
if (szMaxRxLen == 0) return true;
struct timeval t_current;
gettimeofday(&t_current, NULL);
struct timeval t_end;
timeradd(&t_current, &timeout, &t_end);
while (true) {
int res = read(((serial_port_unix*)sp)->fd, pbtRx, szMaxRxLen - *pszRxLen);
if (res < 0 && errno != EAGAIN && errno != EWOULDBLOCK) return false;
if (res > 0) {
*pszRxLen += res;
pbtRx += res;
}
if (*pszRxLen == szMaxRxLen) return true; // we could read all requested bytes in time
gettimeofday(&t_current, NULL);
if (timercmp(&t_current, &t_end, >)) return true; // timeout
// set next select timeout
struct timeval t_remains;
timersub(&t_end, &t_current, &t_remains);
// Set the file descriptor set
fd_set rfds;
FD_ZERO(&rfds);
FD_SET(((serial_port_unix*)sp)->fd, &rfds);
// wait for more bytes available
res = select(((serial_port_unix*)sp)->fd+1, &rfds, NULL, NULL, &t_remains);
if (res < 0) return false;
if (res == 0) return true; // timeout
}
return true; // should never come here
}
bool uart_send(const serial_port sp, const uint8_t* pbtTx, const size_t szTxLen) {
if (szTxLen == 0) return true;
size_t bytes_written = 0;
struct timeval t_current;
gettimeofday(&t_current, NULL);
struct timeval t_end;
timeradd(&t_current, &timeout, &t_end);
while (true) {
int res = write(((serial_port_unix*)sp)->fd, pbtTx, szTxLen - bytes_written);
if (res < 0 && res != EAGAIN && res != EWOULDBLOCK) return false;
if (res > 0) {
pbtTx += res;
bytes_written += res;
}
if (bytes_written == szTxLen) return true; // we could write all bytes
gettimeofday(&t_current, NULL);
if (timercmp(&t_current, &t_end, >)) return false; // timeout
// set next select timeout
struct timeval t_remains;
timersub(&t_end, &t_current, &t_remains);
// Set the file descriptor set
fd_set wfds;
FD_ZERO(&wfds);
FD_SET(((serial_port_unix*)sp)->fd, &wfds);
// wait until more bytes can be written
res = select(((serial_port_unix*)sp)->fd+1, NULL, &wfds, NULL, &t_remains);
if (res < 0) return false; // error
if (res == 0) return false; // timeout
}
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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