278 lines
7.1 KiB
C
278 lines
7.1 KiB
C
/*
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* $Id$
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*/
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/*
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* cangen.c - CAN frames generator for testing purposes
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*
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* Copyright (c) 2002-2007 Volkswagen Group Electronic Research
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Volkswagen nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* Alternatively, provided that this notice is retained in full, this
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* software may be distributed under the terms of the GNU General
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* Public License ("GPL") version 2, in which case the provisions of the
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* GPL apply INSTEAD OF those given above.
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*
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* The provided data structures and external interfaces from this code
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* are not restricted to be used by modules with a GPL compatible license.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* Send feedback to <socketcan-users@lists.berlios.de>
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <signal.h>
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#include <ctype.h>
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#include <libgen.h>
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#include <time.h>
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#include <errno.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <sys/uio.h>
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#include <net/if.h>
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#include <linux/can.h>
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#include <linux/can/raw.h>
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#include "lib.h"
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#define DEFAULT_GAP 200 /* ms */
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extern int optind, opterr, optopt;
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static volatile int running = 1;
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void print_usage(char *prg)
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{
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fprintf(stderr, "\n%s: generate random CAN frames\n\n", prg);
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fprintf(stderr, "Usage: %s [can-interface]\n", prg);
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fprintf(stderr, "Options: -g <ms> (gap in milli seconds) "
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"default: %d\n", DEFAULT_GAP);
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fprintf(stderr, " -e (extended frame mode) "
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"default: standard frame format \n");
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fprintf(stderr, " -I (fixed CAN ID) "
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"default: 0x123\n");
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fprintf(stderr, " -D (fixed CAN Data) "
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"default: 01 23 45 67 89 AB CD EF\n");
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fprintf(stderr, " -L (fixed CAN DLC) "
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"default: 8\n");
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fprintf(stderr, " -f <canframe> (other fixed CAN frame) "
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"default: 123#0123456789ABCDEF\n");
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fprintf(stderr, " -x (disable loopback) "
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"default: standard loopback\n");
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fprintf(stderr, " -v (verbose) "
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"default: don't print sent frames\n");
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}
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void sigterm(int signo)
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{
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running = 0;
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}
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int main(int argc, char **argv)
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{
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unsigned long gap = DEFAULT_GAP;
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unsigned char extended = 0;
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unsigned char fix_id = 0;
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unsigned char fix_data = 0;
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unsigned char fix_dlc = 0;
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unsigned char default_frame = 1;
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unsigned char loopback_disable = 0;
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unsigned char verbose = 0;
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int opt;
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int s; /* socket */
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struct sockaddr_can addr;
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static struct can_frame frame;
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int nbytes;
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struct ifreq ifr;
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struct timespec ts;
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signal(SIGTERM, sigterm);
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signal(SIGHUP, sigterm);
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signal(SIGINT, sigterm);
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while ((opt = getopt(argc, argv, "g:eIDLf:xv")) != -1) {
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switch (opt) {
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case 'g':
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gap = strtoul(optarg, NULL, 10);
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break;
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case 'e':
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extended = 1;
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break;
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case 'I':
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fix_id = 1;
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break;
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case 'D':
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fix_data = 1;
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break;
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case 'L':
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fix_dlc = 1;
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break;
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case 'f':
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default_frame = 0;
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if (parse_canframe(optarg, &frame)) {
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fprintf(stderr, "'%s' is a wrong CAN frame format.\n", optarg);
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exit(1);
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}
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break;
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case 'v':
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verbose = 1;
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break;
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case 'x':
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loopback_disable = 1;
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break;
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default:
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print_usage(basename(argv[0]));
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exit(1);
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break;
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}
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}
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if (optind == argc) {
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print_usage(basename(argv[0]));
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exit(0);
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}
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ts.tv_sec = gap / 1000;
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ts.tv_nsec = (gap % 1000) * 1000000;
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if (default_frame) {
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if (extended)
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frame.can_id = 0x12345678 | CAN_EFF_FLAG;
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else
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frame.can_id = 0x123;
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frame.can_dlc = 8;
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frame.data[0] = 0x01;
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frame.data[1] = 0x23;
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frame.data[2] = 0x45;
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frame.data[3] = 0x67;
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frame.data[4] = 0x89;
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frame.data[5] = 0xAB;
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frame.data[6] = 0xCD;
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frame.data[7] = 0xEF;
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}
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if ((s = socket(PF_CAN, SOCK_RAW, CAN_RAW)) < 0) {
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perror("socket");
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return 1;
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}
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addr.can_family = AF_CAN;
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strcpy(ifr.ifr_name, argv[optind]);
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if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
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perror("SIOCGIFINDEX");
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return 1;
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}
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addr.can_ifindex = ifr.ifr_ifindex;
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/* disable default receive filter on this RAW socket */
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/* This is obsolete as we do not read from the socket at all, but for */
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/* this reason we can remove the receive list in the Kernel to save a */
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/* little (really a very little!) CPU usage. */
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setsockopt(s, SOL_CAN_RAW, CAN_RAW_FILTER, NULL, 0);
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if (loopback_disable) {
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int loopback = 0;
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setsockopt(s, SOL_CAN_RAW, CAN_RAW_LOOPBACK,
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&loopback, sizeof(loopback));
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}
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if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
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perror("bind");
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return 1;
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}
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while (running) {
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if (!fix_id) {
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frame.can_id = random();
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if (extended) {
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frame.can_id &= CAN_EFF_MASK;
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frame.can_id |= CAN_EFF_FLAG;
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} else
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frame.can_id &= CAN_SFF_MASK;
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}
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if (!fix_dlc) {
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frame.can_dlc = random() & 0xF;
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if (frame.can_dlc & 8)
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frame.can_dlc = 8; /* for about 50% of the frames */
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}
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if (!fix_data) {
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/* that's what the 64 bit alignment of data[] is for ... :) */
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*(unsigned long*)(&frame.data[0]) = random();
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*(unsigned long*)(&frame.data[4]) = random();
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}
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if ((nbytes = write(s, &frame, sizeof(struct can_frame))) < 0) {
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perror("write");
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return 1;
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} else if (nbytes < sizeof(struct can_frame)) {
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fprintf(stderr, "write: incomplete CAN frame\n");
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return 1;
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}
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if (gap) /* gap == 0 => performance test :-] */
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if (nanosleep(&ts, NULL))
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return 1;
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if (verbose)
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#if 0
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fprint_long_canframe(stdout, &frame, "\n", 1);
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#else
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fprint_canframe(stdout, &frame, "\n", 1);
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#endif
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}
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close(s);
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return 0;
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}
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