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[proxmark3-svn] / uart / uart_posix.c
1 /*
2 * Generic uart / rs232/ serial port library
3 *
4 * Copyright (c) 2013, Roel Verdult
5 * Copyright (c) 2018 Google
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the copyright holders nor the
16 * names of its contributors may be used to endorse or promote products
17 * derived from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
20 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
21 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
22 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
23 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
24 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
26 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
28 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 *
30 * @file uart_posix.c
31 *
32 * This version of the library has functionality removed which was not used by
33 * proxmark3 project.
34 */
35
36 // Test if we are dealing with posix operating systems
37 #ifndef _WIN32
38 #define _DEFAULT_SOURCE
39
40 #include "uart.h"
41
42 #include <stdlib.h>
43 #include <stdio.h>
44 #include <string.h>
45 #include <stdbool.h>
46 #include <termios.h>
47 #include <sys/ioctl.h>
48 #include <unistd.h>
49 #include <fcntl.h>
50 #include <sys/types.h>
51 #include <sys/stat.h>
52 #include <sys/socket.h>
53 #include <netinet/tcp.h>
54 #include <netdb.h>
55 #include <sys/time.h>
56 #include <errno.h>
57
58 // Fix missing definition on OS X.
59 // Taken from https://github.com/unbit/uwsgi/commit/b608eb1772641d525bfde268fe9d6d8d0d5efde7
60 #ifndef SOL_TCP
61 #define SOL_TCP IPPROTO_TCP
62 #endif
63
64 typedef struct termios term_info;
65 typedef struct {
66 int fd; // Serial port file descriptor
67 term_info tiOld; // Terminal info before using the port
68 term_info tiNew; // Terminal info during the transaction
69 } serial_port_unix;
70
71 // Set time-out on 30 miliseconds
72 static struct timeval timeout = {
73 .tv_sec = 0, // 0 second
74 .tv_usec = 30000 // 30000 micro seconds
75 };
76
77
78 void uart_close(const serial_port sp) {
79 serial_port_unix* spu = (serial_port_unix*)sp;
80 tcflush(spu->fd, TCIOFLUSH);
81 tcsetattr(spu->fd, TCSANOW, &(spu->tiOld));
82 struct flock fl;
83 fl.l_type = F_UNLCK;
84 fl.l_whence = SEEK_SET;
85 fl.l_start = 0;
86 fl.l_len = 0;
87 fl.l_pid = getpid();
88 fcntl(spu->fd, F_SETLK, &fl);
89 close(spu->fd);
90 free(sp);
91 }
92
93
94 serial_port uart_open(const char* pcPortName) {
95
96 serial_port_unix* sp = malloc(sizeof(serial_port_unix));
97 if (sp == 0) return INVALID_SERIAL_PORT;
98
99 if (memcmp(pcPortName, "tcp:", 4) == 0) {
100 struct addrinfo *addr = NULL, *rp;
101 char *addrstr = strdup(pcPortName + 4);
102 if (addrstr == NULL) {
103 printf("Error: strdup\n");
104 return INVALID_SERIAL_PORT;
105 }
106 char *colon = strrchr(addrstr, ':');
107 char *portstr;
108
109 // Set time-out to 300 milliseconds only for TCP port
110 timeout.tv_usec = 300000;
111
112 if (colon) {
113 portstr = colon + 1;
114 *colon = '\0';
115 } else {
116 portstr = "7901";
117 }
118
119 struct addrinfo info;
120
121 memset(&info, 0, sizeof(info));
122
123 info.ai_socktype = SOCK_STREAM;
124
125 int s = getaddrinfo(addrstr, portstr, &info, &addr);
126 if (s != 0) {
127 printf("Error: getaddrinfo: %s\n", gai_strerror(s));
128 return INVALID_SERIAL_PORT;
129 }
130
131 int sfd;
132 for (rp = addr; rp != NULL; rp = rp->ai_next) {
133 sfd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
134 if (sfd == -1)
135 continue;
136 if (connect(sfd, rp->ai_addr, rp->ai_addrlen) != -1)
137 break;
138 close(sfd);
139 }
140
141 if (rp == NULL) { /* No address succeeded */
142 printf("Error: Could not connect\n");
143 return INVALID_SERIAL_PORT;
144 }
145
146 freeaddrinfo(addr);
147 free(addrstr);
148
149 sp->fd = sfd;
150
151 int one = 1;
152 setsockopt(sp->fd, SOL_TCP, TCP_NODELAY, &one, sizeof(one));
153 return sp;
154 }
155
156 sp->fd = open(pcPortName, O_RDWR | O_NOCTTY | O_NDELAY | O_NONBLOCK);
157 if (sp->fd == -1) {
158 uart_close(sp);
159 return INVALID_SERIAL_PORT;
160 }
161
162 // Finally figured out a way to claim a serial port interface under unix
163 // We just try to set a (advisory) lock on the file descriptor
164 struct flock fl;
165 fl.l_type = F_WRLCK;
166 fl.l_whence = SEEK_SET;
167 fl.l_start = 0;
168 fl.l_len = 0;
169 fl.l_pid = getpid();
170
171 // Does the system allows us to place a lock on this file descriptor
172 if (fcntl(sp->fd, F_SETLK, &fl) == -1) {
173 // A conflicting lock is held by another process
174 free(sp);
175 return CLAIMED_SERIAL_PORT;
176 }
177
178 // Try to retrieve the old (current) terminal info struct
179 if (tcgetattr(sp->fd,&sp->tiOld) == -1) {
180 uart_close(sp);
181 return INVALID_SERIAL_PORT;
182 }
183
184 // Duplicate the (old) terminal info struct
185 sp->tiNew = sp->tiOld;
186
187 // Configure the serial port
188 sp->tiNew.c_cflag &= ~(CSIZE | PARENB);
189 sp->tiNew.c_cflag |= (CS8 | CLOCAL | CREAD);
190 sp->tiNew.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IXON);
191 sp->tiNew.c_iflag |= IGNPAR;
192 sp->tiNew.c_oflag &= ~OPOST;
193 sp->tiNew.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
194
195
196 // Try to set the new terminal info struct
197 if (tcsetattr(sp->fd, TCSANOW, &sp->tiNew) == -1) {
198 uart_close(sp);
199 return INVALID_SERIAL_PORT;
200 }
201
202 // Flush all lingering data that may exist
203 tcflush(sp->fd, TCIOFLUSH);
204
205 return sp;
206 }
207
208
209 bool uart_receive(const serial_port sp, uint8_t* pbtRx, size_t szMaxRxLen, size_t* pszRxLen) {
210
211 *pszRxLen = 0;
212
213 if (szMaxRxLen == 0) return true;
214
215 struct timeval t_current;
216 gettimeofday(&t_current, NULL);
217 struct timeval t_end;
218 timeradd(&t_current, &timeout, &t_end);
219
220 while (true) {
221 int res = read(((serial_port_unix*)sp)->fd, pbtRx, szMaxRxLen - *pszRxLen);
222 if (res < 0 && errno != EAGAIN && errno != EWOULDBLOCK) return false;
223 if (res > 0) {
224 *pszRxLen += res;
225 pbtRx += res;
226 }
227 if (*pszRxLen == szMaxRxLen) return true; // we could read all requested bytes in time
228 gettimeofday(&t_current, NULL);
229 if (timercmp(&t_current, &t_end, >)) return true; // timeout
230 // set next select timeout
231 struct timeval t_remains;
232 timersub(&t_end, &t_current, &t_remains);
233 // Set the file descriptor set
234 fd_set rfds;
235 FD_ZERO(&rfds);
236 FD_SET(((serial_port_unix*)sp)->fd, &rfds);
237 // wait for more bytes available
238 res = select(((serial_port_unix*)sp)->fd+1, &rfds, NULL, NULL, &t_remains);
239 if (res < 0) return false;
240 if (res == 0) return true; // timeout
241 }
242 return true; // should never come here
243 }
244
245
246 bool uart_send(const serial_port sp, const uint8_t* pbtTx, const size_t szTxLen) {
247
248 if (szTxLen == 0) return true;
249
250 size_t bytes_written = 0;
251
252 struct timeval t_current;
253 gettimeofday(&t_current, NULL);
254 struct timeval t_end;
255 timeradd(&t_current, &timeout, &t_end);
256
257 while (true) {
258 int res = write(((serial_port_unix*)sp)->fd, pbtTx, szTxLen - bytes_written);
259 if (res < 0 && res != EAGAIN && res != EWOULDBLOCK) return false;
260 if (res > 0) {
261 pbtTx += res;
262 bytes_written += res;
263 }
264 if (bytes_written == szTxLen) return true; // we could write all bytes
265 gettimeofday(&t_current, NULL);
266 if (timercmp(&t_current, &t_end, >)) return false; // timeout
267 // set next select timeout
268 struct timeval t_remains;
269 timersub(&t_end, &t_current, &t_remains);
270 // Set the file descriptor set
271 fd_set wfds;
272 FD_ZERO(&wfds);
273 FD_SET(((serial_port_unix*)sp)->fd, &wfds);
274 // wait until more bytes can be written
275 res = select(((serial_port_unix*)sp)->fd+1, NULL, &wfds, NULL, &t_remains);
276 if (res < 0) return false; // error
277 if (res == 0) return false; // timeout
278 }
279 return true;
280 }
281
282
283 bool uart_set_speed(serial_port sp, const uint32_t uiPortSpeed) {
284 const serial_port_unix* spu = (serial_port_unix*)sp;
285 speed_t stPortSpeed;
286 switch (uiPortSpeed) {
287 case 0: stPortSpeed = B0; break;
288 case 50: stPortSpeed = B50; break;
289 case 75: stPortSpeed = B75; break;
290 case 110: stPortSpeed = B110; break;
291 case 134: stPortSpeed = B134; break;
292 case 150: stPortSpeed = B150; break;
293 case 300: stPortSpeed = B300; break;
294 case 600: stPortSpeed = B600; break;
295 case 1200: stPortSpeed = B1200; break;
296 case 1800: stPortSpeed = B1800; break;
297 case 2400: stPortSpeed = B2400; break;
298 case 4800: stPortSpeed = B4800; break;
299 case 9600: stPortSpeed = B9600; break;
300 case 19200: stPortSpeed = B19200; break;
301 case 38400: stPortSpeed = B38400; break;
302 # ifdef B57600
303 case 57600: stPortSpeed = B57600; break;
304 # endif
305 # ifdef B115200
306 case 115200: stPortSpeed = B115200; break;
307 # endif
308 # ifdef B230400
309 case 230400: stPortSpeed = B230400; break;
310 # endif
311 # ifdef B460800
312 case 460800: stPortSpeed = B460800; break;
313 # endif
314 # ifdef B921600
315 case 921600: stPortSpeed = B921600; break;
316 # endif
317 default: return false;
318 };
319 struct termios ti;
320 if (tcgetattr(spu->fd, &ti) == -1) return false;
321 // Set port speed (Input and Output)
322 cfsetispeed(&ti,stPortSpeed);
323 cfsetospeed(&ti,stPortSpeed);
324 return (tcsetattr(spu->fd, TCSANOW, &ti) != -1);
325 }
326
327 uint32_t uart_get_speed(const serial_port sp) {
328 struct termios ti;
329 uint32_t uiPortSpeed;
330 const serial_port_unix* spu = (serial_port_unix*)sp;
331 if (tcgetattr(spu->fd, &ti) == -1) return 0;
332 // Set port speed (Input)
333 speed_t stPortSpeed = cfgetispeed(&ti);
334 switch (stPortSpeed) {
335 case B0: uiPortSpeed = 0; break;
336 case B50: uiPortSpeed = 50; break;
337 case B75: uiPortSpeed = 75; break;
338 case B110: uiPortSpeed = 110; break;
339 case B134: uiPortSpeed = 134; break;
340 case B150: uiPortSpeed = 150; break;
341 case B300: uiPortSpeed = 300; break;
342 case B600: uiPortSpeed = 600; break;
343 case B1200: uiPortSpeed = 1200; break;
344 case B1800: uiPortSpeed = 1800; break;
345 case B2400: uiPortSpeed = 2400; break;
346 case B4800: uiPortSpeed = 4800; break;
347 case B9600: uiPortSpeed = 9600; break;
348 case B19200: uiPortSpeed = 19200; break;
349 case B38400: uiPortSpeed = 38400; break;
350 # ifdef B57600
351 case B57600: uiPortSpeed = 57600; break;
352 # endif
353 # ifdef B115200
354 case B115200: uiPortSpeed = 115200; break;
355 # endif
356 # ifdef B230400
357 case B230400: uiPortSpeed = 230400; break;
358 # endif
359 # ifdef B460800
360 case B460800: uiPortSpeed = 460800; break;
361 # endif
362 # ifdef B921600
363 case B921600: uiPortSpeed = 921600; break;
364 # endif
365 default: return 0;
366 };
367 return uiPortSpeed;
368 }
369
370 #endif
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