6 * canplayer.c - replay a compact CAN frame logfile to CAN devices
8 * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of Volkswagen nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
23 * Alternatively, provided that this notice is retained in full, this
24 * software may be distributed under the terms of the GNU General
25 * Public License ("GPL") version 2, in which case the provisions of the
26 * GPL apply INSTEAD OF those given above.
28 * The provided data structures and external interfaces from this code
29 * are not restricted to be used by modules with a GPL compatible license.
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
36 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
37 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
38 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
39 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
40 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
41 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
44 * Send feedback to <linux-can@vger.kernel.org>
56 #include <sys/socket.h>
57 #include <sys/ioctl.h>
59 #include <linux/can.h>
60 #include <linux/can/raw.h>
64 #define DEFAULT_GAP 1 /* ms */
65 #define DEFAULT_LOOPS 1 /* only one replay */
66 #define CHANNELS 20 /* anyone using more than 20 CAN interfaces at a time? */
68 #define BUFSZ (sizeof("(1345212884.318850)") + IFNAMSIZ + 4 + CL_CFSZ + COMMENTSZ) /* for one line in the logfile */
69 #define STDOUTIDX 65536 /* interface index for printing on stdout - bigger than max uint16 */
76 static struct assignment asgn[CHANNELS];
77 const int canfd_on = 1;
79 extern int optind, opterr, optopt;
81 void print_usage(char *prg)
83 fprintf(stderr, "\nUsage: %s <options> [interface assignment]*\n\n", prg);
84 fprintf(stderr, "Options: -I <infile> (default stdin)\n");
85 fprintf(stderr, " -l <num> "
86 "(process input file <num> times)\n"
88 "(Use 'i' for infinite loop - default: %d)\n", DEFAULT_LOOPS);
89 fprintf(stderr, " -t (ignore timestamps: "
90 "send frames immediately)\n");
91 fprintf(stderr, " -g <ms> (gap in milli "
92 "seconds - default: %d ms)\n", DEFAULT_GAP);
93 fprintf(stderr, " -s <s> (skip gaps in "
94 "timestamps > 's' seconds)\n");
95 fprintf(stderr, " -x (disable local "
96 "loopback of sent CAN frames)\n");
97 fprintf(stderr, " -v (verbose: print "
98 "sent CAN frames)\n\n");
99 fprintf(stderr, "Interface assignment: 0..n assignments like "
100 "<write-if>=<log-if>\n");
101 fprintf(stderr, "e.g. vcan2=can0 ( send frames received from can0 on "
103 fprintf(stderr, "extra hook: stdout=can0 ( print logfile line marked with can0 on "
105 fprintf(stderr, "No assignments => send frames to the interface(s) they "
106 "had been received from.\n\n");
107 fprintf(stderr, "Lines in the logfile not beginning with '(' (start of "
108 "timestamp) are ignored.\n\n");
111 /* copied from /usr/src/linux/include/linux/time.h ...
112 * lhs < rhs: return <0
113 * lhs == rhs: return 0
114 * lhs > rhs: return >0
116 static inline int timeval_compare(struct timeval *lhs, struct timeval *rhs)
118 if (lhs->tv_sec < rhs->tv_sec)
120 if (lhs->tv_sec > rhs->tv_sec)
122 return lhs->tv_usec - rhs->tv_usec;
125 static inline void create_diff_tv(struct timeval *today, struct timeval *diff,
126 struct timeval *log) {
128 /* create diff_tv so that log_tv + diff_tv = today_tv */
129 diff->tv_sec = today->tv_sec - log->tv_sec;
130 diff->tv_usec = today->tv_usec - log->tv_usec;
133 static inline int frames_to_send(struct timeval *today, struct timeval *diff,
136 /* return value <0 when log + diff < today */
140 cmp.tv_sec = log->tv_sec + diff->tv_sec;
141 cmp.tv_usec = log->tv_usec + diff->tv_usec;
143 if (cmp.tv_usec > 1000000) {
144 cmp.tv_usec -= 1000000;
148 if (cmp.tv_usec < 0) {
149 cmp.tv_usec += 1000000;
153 return timeval_compare(&cmp, today);
156 int get_txidx(char *logif_name) {
160 for (i=0; i<CHANNELS; i++) {
161 if (asgn[i].rxif[0] == 0) /* end of table content */
163 if (strcmp(asgn[i].rxif, logif_name) == 0) /* found device name */
167 if ((i == CHANNELS) || (asgn[i].rxif[0] == 0))
168 return 0; /* not found */
170 return asgn[i].txifidx; /* return interface index */
173 char *get_txname(char *logif_name) {
177 for (i=0; i<CHANNELS; i++) {
178 if (asgn[i].rxif[0] == 0) /* end of table content */
180 if (strcmp(asgn[i].rxif, logif_name) == 0) /* found device name */
184 if ((i == CHANNELS) || (asgn[i].rxif[0] == 0))
185 return 0; /* not found */
187 return asgn[i].txif; /* return interface name */
190 int add_assignment(char *mode, int socket, char *txname, char *rxname,
196 /* find free entry */
197 for (i=0; i<CHANNELS; i++) {
198 if (asgn[i].txif[0] == 0)
203 fprintf(stderr, "Assignment table exceeded!\n");
207 if (strlen(txname) >= IFNAMSIZ) {
208 fprintf(stderr, "write-if interface name '%s' too long!", txname);
211 strcpy(asgn[i].txif, txname);
213 if (strlen(rxname) >= IFNAMSIZ) {
214 fprintf(stderr, "log-if interface name '%s' too long!", rxname);
217 strcpy(asgn[i].rxif, rxname);
219 if (strcmp(txname, "stdout")) {
220 strcpy(ifr.ifr_name, txname);
221 if (ioctl(socket, SIOCGIFINDEX, &ifr) < 0) {
222 perror("SIOCGIFINDEX");
223 fprintf(stderr, "write-if interface name '%s' is wrong!\n", txname);
226 asgn[i].txifidx = ifr.ifr_ifindex;
228 asgn[i].txifidx = STDOUTIDX;
230 if (verbose > 1) /* use -v -v to see this */
231 printf("added %s assignment: log-if=%s write-if=%s write-if-idx=%d\n",
232 mode, asgn[i].rxif, asgn[i].txif, asgn[i].txifidx);
237 int main(int argc, char **argv)
239 static char buf[BUFSZ], device[BUFSZ], ascframe[BUFSZ];
240 struct sockaddr_can addr;
241 static struct canfd_frame frame;
242 static struct timeval today_tv, log_tv, last_log_tv, diff_tv;
243 struct timespec sleep_ts;
244 int s; /* CAN_RAW socket */
245 FILE *infile = stdin;
246 unsigned long gap = DEFAULT_GAP;
247 int use_timestamps = 1;
248 static int verbose, opt, delay_loops, skipgap;
249 static int loopback_disable = 0;
250 static int infinite_loops = 0;
251 static int loops = DEFAULT_LOOPS;
252 int assignments; /* assignments defined on the commandline */
253 int txidx; /* sendto() interface index */
254 int eof, txmtu, i, j;
257 while ((opt = getopt(argc, argv, "I:l:tg:s:xv?")) != -1) {
260 infile = fopen(optarg, "r");
268 if (optarg[0] == 'i')
271 if (!(loops = atoi(optarg))) {
272 fprintf(stderr, "Invalid argument for option -l !\n");
282 gap = strtoul(optarg, NULL, 10);
286 skipgap = strtoul(optarg, NULL, 10);
288 fprintf(stderr, "Invalid argument for option -s !\n");
294 loopback_disable = 1;
303 print_usage(basename(argv[0]));
309 assignments = argc - optind; /* find real number of user assignments */
311 if (infile == stdin) { /* no jokes with stdin */
316 if (verbose > 1) { /* use -v -v to see this */
318 printf("infinite_loops\n");
320 printf("%d loops\n", loops);
323 sleep_ts.tv_sec = gap / 1000;
324 sleep_ts.tv_nsec = (gap % 1000) * 1000000;
327 if ((s = socket(PF_CAN, SOCK_RAW, CAN_RAW)) < 0) {
332 addr.can_family = AF_CAN;
333 addr.can_ifindex = 0;
335 /* disable unneeded default receive filter on this RAW socket */
336 setsockopt(s, SOL_CAN_RAW, CAN_RAW_FILTER, NULL, 0);
338 /* try to switch the socket into CAN FD mode */
339 setsockopt(s, SOL_CAN_RAW, CAN_RAW_FD_FRAMES, &canfd_on, sizeof(canfd_on));
341 if (loopback_disable) {
344 setsockopt(s, SOL_CAN_RAW, CAN_RAW_LOOPBACK,
345 &loopback, sizeof(loopback));
348 if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
354 /* add & check user assginments from commandline */
355 for (i=0; i<assignments; i++) {
356 if (strlen(argv[optind+i]) >= BUFSZ) {
357 fprintf(stderr, "Assignment too long!\n");
358 print_usage(basename(argv[0]));
361 strcpy(buf, argv[optind+i]);
362 for (j=0; j<BUFSZ; j++) { /* find '=' in assignment */
366 if ((j == BUFSZ) || (buf[j] != '=')) {
367 fprintf(stderr, "'=' missing in assignment!\n");
368 print_usage(basename(argv[0]));
371 buf[j] = 0; /* cut string in two pieces */
372 if (add_assignment("user", s, &buf[0], &buf[j+1], verbose))
377 while (infinite_loops || loops--) {
380 rewind(infile); /* for each loop */
382 if (verbose > 1) /* use -v -v to see this */
383 printf (">>>>>>>>> start reading file. remaining loops = %d\n", loops);
385 /* read first non-comment frame from logfile */
386 while ((fret = fgets(buf, BUFSZ-1, infile)) != NULL && buf[0] != '(') {
387 if (strlen(buf) >= BUFSZ-2) {
388 fprintf(stderr, "comment line too long for input buffer\n");
394 goto out; /* nothing to read */
398 if (sscanf(buf, "(%ld.%ld) %s %s", &log_tv.tv_sec, &log_tv.tv_usec,
399 device, ascframe) != 4) {
400 fprintf(stderr, "incorrect line format in logfile\n");
404 if (use_timestamps) { /* throttle sending due to logfile timestamps */
406 gettimeofday(&today_tv, NULL);
407 create_diff_tv(&today_tv, &diff_tv, &log_tv);
408 last_log_tv = log_tv;
413 while ((!use_timestamps) ||
414 (frames_to_send(&today_tv, &diff_tv, &log_tv) < 0)) {
416 /* log_tv/device/ascframe are valid here */
418 if (strlen(device) >= IFNAMSIZ) {
419 fprintf(stderr, "log interface name '%s' too long!", device);
423 txidx = get_txidx(device); /* get ifindex for sending the frame */
425 if ((!txidx) && (!assignments)) {
426 /* ifindex not found and no user assignments */
427 /* => assign this device automatically */
428 if (add_assignment("auto", s, device, device, verbose))
430 txidx = get_txidx(device);
433 if (txidx == STDOUTIDX) { /* hook to print logfile lines on stdout */
435 printf("%s", buf); /* print the line AS-IS without extra \n */
438 } else if (txidx > 0) { /* only send to valid CAN devices */
440 txmtu = parse_canframe(ascframe, &frame);
442 fprintf(stderr, "wrong CAN frame format: '%s'!", ascframe);
446 addr.can_family = AF_CAN;
447 addr.can_ifindex = txidx; /* send via this interface */
449 if (sendto(s, &frame, txmtu, 0, (struct sockaddr*)&addr, sizeof(addr)) != txmtu) {
455 printf("%s (%s) ", get_txname(device), device);
457 if (txmtu == CAN_MTU)
458 fprint_long_canframe(stdout, &frame, "\n", CANLIB_VIEW_INDENT_SFF, CAN_MAX_DLEN);
460 fprint_long_canframe(stdout, &frame, "\n", CANLIB_VIEW_INDENT_SFF, CANFD_MAX_DLEN);
464 /* read next non-comment frame from logfile */
465 while ((fret = fgets(buf, BUFSZ-1, infile)) != NULL && buf[0] != '(') {
466 if (strlen(buf) >= BUFSZ-2) {
467 fprintf(stderr, "comment line too long for input buffer\n");
473 eof = 1; /* this file is completely processed */
477 if (sscanf(buf, "(%ld.%ld) %s %s", &log_tv.tv_sec, &log_tv.tv_usec,
478 device, ascframe) != 4) {
479 fprintf(stderr, "incorrect line format in logfile\n");
483 if (use_timestamps) {
484 gettimeofday(&today_tv, NULL);
486 /* test for logfile timestamps jumping backwards OR */
487 /* if the user likes to skip long gaps in the timestamps */
488 if ((last_log_tv.tv_sec > log_tv.tv_sec) ||
489 (skipgap && abs(last_log_tv.tv_sec - log_tv.tv_sec) > skipgap))
490 create_diff_tv(&today_tv, &diff_tv, &log_tv);
492 last_log_tv = log_tv;
495 } /* while frames_to_send ... */
497 if (nanosleep(&sleep_ts, NULL))
500 delay_loops++; /* private statistics */
501 gettimeofday(&today_tv, NULL);
505 } /* while (infinite_loops || loops--) */
512 if (verbose > 1) /* use -v -v to see this */
513 printf("%d delay_loops\n", delay_loops);