234 lines
5.9 KiB
C
Executable File
234 lines
5.9 KiB
C
Executable File
/*
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* slcan_attach.c - userspace tool for serial line CAN interface driver SLCAN
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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 <linux-can@vger.kernel.org>
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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 <string.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <getopt.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <net/if.h>
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#include <termios.h>
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#include <linux/tty.h>
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void print_usage(char *prg)
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{
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fprintf(stderr, "\nUsage: %s [options] tty\n\n", prg);
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fprintf(stderr, "Options: -o (send open command 'O\\r')\n");
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fprintf(stderr, " -c (send close command 'C\\r')\n");
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fprintf(stderr, " -f (read status flags with 'F\\r' to reset error states)\n");
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fprintf(stderr, " -s <speed> (set CAN speed 0..8)\n");
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fprintf(stderr, " -b <btr> (set bit time register value)\n");
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fprintf(stderr, " -d (only detach line discipline)\n");
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fprintf(stderr, " -w (attach - wait for keypess - detach)\n");
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fprintf(stderr, " -n <name> (assign created netdevice name)\n");
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fprintf(stderr, "\nExamples:\n");
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fprintf(stderr, "slcan_attach -w -o -f -s6 -c /dev/ttyS1\n");
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fprintf(stderr, "slcan_attach /dev/ttyS1\n");
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fprintf(stderr, "slcan_attach -d /dev/ttyS1\n");
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fprintf(stderr, "slcan_attach -w -n can15 /dev/ttyS1\n");
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fprintf(stderr, "\n");
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exit(1);
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}
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int main(int argc, char **argv)
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{
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int fd;
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int ldisc = N_SLCAN;
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int detach = 0;
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int waitkey = 0;
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int send_open = 0;
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int send_close = 0;
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int send_read_status_flags = 0;
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char *speed = NULL;
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char *btr = NULL;
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char buf[IFNAMSIZ+1];
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char *tty;
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char *name = NULL;
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int opt;
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while ((opt = getopt(argc, argv, "l:dwocfs:b:n:?")) != -1) {
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switch (opt) {
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case 'l':
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fprintf(stderr, "Ignored option '-l'\n");
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break;
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case 'd':
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detach = 1;
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break;
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case 'w':
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waitkey = 1;
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break;
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case 'o':
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send_open = 1;
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break;
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case 'c':
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send_close = 1;
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break;
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case 'f':
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send_read_status_flags = 1;
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break;
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case 's':
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speed = optarg;
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if (strlen(speed) > 1)
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print_usage(argv[0]);
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break;
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case 'b':
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btr = optarg;
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if (strlen(btr) > 6)
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print_usage(argv[0]);
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break;
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case 'n':
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name = optarg;
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if (strlen(name) > IFNAMSIZ-1)
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print_usage(argv[0]);
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break;
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case '?':
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default:
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print_usage(argv[0]);
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break;
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}
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}
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if (argc - optind != 1)
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print_usage(argv[0]);
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tty = argv[optind];
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if ((fd = open (tty, O_WRONLY | O_NOCTTY)) < 0) {
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perror(tty);
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exit(1);
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}
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if (waitkey || !detach) {
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if (speed) {
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sprintf(buf, "C\rS%s\r", speed);
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write(fd, buf, strlen(buf));
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}
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if (btr) {
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sprintf(buf, "C\rs%s\r", btr);
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write(fd, buf, strlen(buf));
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}
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if (send_read_status_flags) {
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sprintf(buf, "F\r");
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write(fd, buf, strlen(buf));
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}
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if (send_open) {
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sprintf(buf, "O\r");
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write(fd, buf, strlen(buf));
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}
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/* set slcan line discipline on given tty */
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if (ioctl (fd, TIOCSETD, &ldisc) < 0) {
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perror("ioctl TIOCSETD");
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exit(1);
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}
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/* retrieve the name of the created CAN netdevice */
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if (ioctl (fd, SIOCGIFNAME, buf) < 0) {
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perror("ioctl SIOCGIFNAME");
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exit(1);
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}
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printf("attached tty %s to netdevice %s\n", tty, buf);
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/* try to rename the created device if requested */
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if (name) {
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struct ifreq ifr;
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int s = socket(PF_INET, SOCK_DGRAM, 0);
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printf("rename netdevice %s to %s ... ", buf, name);
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if (s < 0)
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perror("socket for interface rename");
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else {
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strncpy (ifr.ifr_name, buf, IFNAMSIZ);
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strncpy (ifr.ifr_newname, name, IFNAMSIZ);
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if (ioctl(s, SIOCSIFNAME, &ifr) < 0)
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printf("failed!\n");
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else
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printf("ok.\n");
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close(s);
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}
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}
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}
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if (waitkey) {
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printf("Press any key to detach %s ...\n", tty);
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getchar();
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}
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if (waitkey || detach) {
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ldisc = N_TTY;
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if (ioctl (fd, TIOCSETD, &ldisc) < 0) {
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perror("ioctl");
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exit(1);
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}
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if (send_close) {
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sprintf(buf, "C\r");
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write(fd, buf, strlen(buf));
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}
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}
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close(fd);
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return 0;
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}
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