6 * cangen.c - CAN frames generator for testing purposes
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
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40 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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44 * Send feedback to <socketcan-users@lists.berlios.de>
60 #include <sys/types.h>
61 #include <sys/socket.h>
62 #include <sys/ioctl.h>
66 #include <linux/can.h>
67 #include <linux/can/raw.h>
70 #define DEFAULT_GAP 200 /* ms */
73 #define MODE_INCREMENT 1
76 extern int optind, opterr, optopt;
78 static volatile int running = 1;
79 static unsigned long long enobufs_count;
81 void print_usage(char *prg)
83 fprintf(stderr, "\n%s: generate CAN frames\n\n", prg);
84 fprintf(stderr, "Usage: %s [options] <CAN interface>\n", prg);
85 fprintf(stderr, "Options: -g <ms> (gap in milli seconds "
86 "- default: %d ms)\n", DEFAULT_GAP);
87 fprintf(stderr, " -e (generate extended frame mode "
88 "(EFF) CAN frames)\n");
89 fprintf(stderr, " -I <mode> (CAN ID"
90 " generation mode - see below)\n");
91 fprintf(stderr, " -L <mode> (CAN data length code (dlc)"
92 " generation mode - see below)\n");
93 fprintf(stderr, " -D <mode> (CAN data (payload)"
94 " generation mode - see below)\n");
95 fprintf(stderr, " -i (ignore -ENOBUFS return values on"
96 " write() syscalls)\n");
97 fprintf(stderr, " -x (disable local loopback of "
98 "generated CAN frames)\n");
99 fprintf(stderr, " -v (increment verbose level for "
100 "printing sent CAN frames)\n\n");
101 fprintf(stderr, "Generation modes:\n");
102 fprintf(stderr, "'r' => random values (default)\n");
103 fprintf(stderr, "'i' => increment values\n");
104 fprintf(stderr, "<hexvalue> => fix value using <hexvalue>\n\n");
105 fprintf(stderr, "When incrementing the CAN data the data length code "
106 "minimum is set to 1.\n");
107 fprintf(stderr, "CAN IDs and data content are given and expected in hexadecimal values.\n\n");
108 fprintf(stderr, "Examples:\n");
109 fprintf(stderr, "%s vcan0 -g 4 -I 42A -L 1 -D i -v -v ", prg);
110 fprintf(stderr, "(fixed CAN ID and length, inc. data)\n");
111 fprintf(stderr, "%s vcan0 -e -L i -v -v -v ", prg);
112 fprintf(stderr, "(generate EFF frames, incr. length)\n");
113 fprintf(stderr, "%s vcan0 -D 11223344DEADBEEF -L 8 ", prg);
114 fprintf(stderr, "(fixed CAN data payload and length)\n");
115 fprintf(stderr, "%s vcan0 -g 0 -i -x ", prg);
116 fprintf(stderr, "(full load test ignoring -ENOBUFS)\n");
117 fprintf(stderr, "%s vcan0 ", prg);
118 fprintf(stderr, "(my favourite default :)\n\n");
121 void sigterm(int signo)
126 int main(int argc, char **argv)
128 unsigned long gap = DEFAULT_GAP;
129 unsigned char ignore_enobufs = 0;
130 unsigned char extended = 0;
131 unsigned char id_mode = MODE_RANDOM;
132 unsigned char data_mode = MODE_RANDOM;
133 unsigned char dlc_mode = MODE_RANDOM;
134 unsigned char loopback_disable = 0;
135 unsigned char verbose = 0;
136 uint64_t incdata = 0;
141 struct sockaddr_can addr;
142 static struct can_frame frame;
149 signal(SIGTERM, sigterm);
150 signal(SIGHUP, sigterm);
151 signal(SIGINT, sigterm);
153 while ((opt = getopt(argc, argv, "ig:eI:L:D:xvh?")) != -1) {
161 gap = strtoul(optarg, NULL, 10);
169 if (optarg[0] == 'r') {
170 id_mode = MODE_RANDOM;
171 } else if (optarg[0] == 'i') {
172 id_mode = MODE_INCREMENT;
175 frame.can_id = strtoul(optarg, NULL, 16);
180 if (optarg[0] == 'r') {
181 dlc_mode = MODE_RANDOM;
182 } else if (optarg[0] == 'i') {
183 dlc_mode = MODE_INCREMENT;
186 frame.can_dlc = atoi(optarg)%9;
191 if (optarg[0] == 'r') {
192 data_mode = MODE_RANDOM;
193 } else if (optarg[0] == 'i') {
194 data_mode = MODE_INCREMENT;
196 data_mode = MODE_FIX;
197 incdata = strtoull(optarg, NULL, 16);
199 frame.data[i] = (incdata >> (7-i)*8) & 0xFFULL;
208 loopback_disable = 1;
214 print_usage(basename(argv[0]));
220 if (optind == argc) {
221 print_usage(basename(argv[0]));
225 ts.tv_sec = gap / 1000;
226 ts.tv_nsec = (gap % 1000) * 1000000;
229 if (id_mode == MODE_FIX) {
231 /* recognize obviously missing commandline option */
232 if ((frame.can_id > 0x7FF) && !extended) {
233 printf("The given CAN-ID is greater than 0x7FF and "
234 "the '-e' option is not set.\n");
239 frame.can_id &= CAN_EFF_MASK;
241 frame.can_id &= CAN_SFF_MASK;
245 frame.can_id |= CAN_EFF_FLAG;
247 if ((data_mode == MODE_INCREMENT) && !frame.can_dlc)
248 frame.can_dlc = 1; /* min dlc value for incr. data */
250 if (strlen(argv[optind]) >= IFNAMSIZ) {
251 printf("Name of CAN device '%s' is too long!\n\n", argv[optind]);
255 if ((s = socket(PF_CAN, SOCK_RAW, CAN_RAW)) < 0) {
260 addr.can_family = AF_CAN;
262 strcpy(ifr.ifr_name, argv[optind]);
263 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
264 perror("SIOCGIFINDEX");
267 addr.can_ifindex = ifr.ifr_ifindex;
269 /* disable default receive filter on this RAW socket */
270 /* This is obsolete as we do not read from the socket at all, but for */
271 /* this reason we can remove the receive list in the Kernel to save a */
272 /* little (really a very little!) CPU usage. */
273 setsockopt(s, SOL_CAN_RAW, CAN_RAW_FILTER, NULL, 0);
275 if (loopback_disable) {
278 setsockopt(s, SOL_CAN_RAW, CAN_RAW_LOOPBACK,
279 &loopback, sizeof(loopback));
282 if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
289 if (id_mode == MODE_RANDOM) {
291 frame.can_id = random();
294 frame.can_id &= CAN_EFF_MASK;
295 frame.can_id |= CAN_EFF_FLAG;
297 frame.can_id &= CAN_SFF_MASK;
300 if (dlc_mode == MODE_RANDOM) {
302 frame.can_dlc = random() & 0xF;
304 if (frame.can_dlc & 8)
305 frame.can_dlc = 8; /* for about 50% of the frames */
307 if ((data_mode == MODE_INCREMENT) && !frame.can_dlc)
308 frame.can_dlc = 1; /* min dlc value for incr. data */
311 if (data_mode == MODE_RANDOM) {
313 /* that's what the 64 bit alignment of data[] is for ... :) */
314 *(unsigned long*)(&frame.data[0]) = random();
315 *(unsigned long*)(&frame.data[4]) = random();
320 printf(" %s ", argv[optind]);
323 fprint_long_canframe(stdout, &frame, "\n", (verbose > 2)?1:0);
325 fprint_canframe(stdout, &frame, "\n", 1);
328 nbytes = write(s, &frame, sizeof(struct can_frame));
330 if (errno != ENOBUFS) {
334 if (!ignore_enobufs) {
340 } else if (nbytes < sizeof(struct can_frame)) {
341 fprintf(stderr, "write: incomplete CAN frame\n");
345 if (gap) /* gap == 0 => performance test :-] */
346 if (nanosleep(&ts, NULL))
349 if (id_mode == MODE_INCREMENT) {
354 frame.can_id &= CAN_EFF_MASK;
355 frame.can_id |= CAN_EFF_FLAG;
357 frame.can_id &= CAN_SFF_MASK;
360 if (dlc_mode == MODE_INCREMENT) {
365 if ((data_mode == MODE_INCREMENT) && !frame.can_dlc)
366 frame.can_dlc = 1; /* min dlc value for incr. data */
369 if (data_mode == MODE_INCREMENT) {
374 frame.data[i] = (incdata >> i*8) & 0xFFULL;
379 printf("\nCounted %llu ENOBUFS return values on write().\n\n",