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slcan_attach.c
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slcan_attach.c
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/*
* slcan_attach.c - userspace tool for serial line CAN interface driver SLCAN
*
* Copyright (c) 2002-2007 Volkswagen Group Electronic Research
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Volkswagen nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* Alternatively, provided that this notice is retained in full, this
* software may be distributed under the terms of the GNU General
* Public License ("GPL") version 2, in which case the provisions of the
* GPL apply INSTEAD OF those given above.
*
* The provided data structures and external interfaces from this code
* are not restricted to be used by modules with a GPL compatible license.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* Send feedback to <linux-can@vger.kernel.org>
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <getopt.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <termios.h>
#include <linux/tty.h>
#include <linux/sockios.h>
void print_usage(char *prg)
{
fprintf(stderr, "\nUsage: %s [options] tty\n\n", prg);
fprintf(stderr, "Options: -o (send open command 'O\\r')\n");
fprintf(stderr, " -l (send listen only command 'L\\r', overrides -o)\n");
fprintf(stderr, " -c (send close command 'C\\r')\n");
fprintf(stderr, " -f (read status flags with 'F\\r' to reset error states)\n");
fprintf(stderr, " -s <speed> (set CAN speed 0..8)\n");
fprintf(stderr, " -b <btr> (set bit time register value)\n");
fprintf(stderr, " -d (only detach line discipline)\n");
fprintf(stderr, " -w (attach - wait for keypess - detach)\n");
fprintf(stderr, " -n <name> (assign created netdevice name)\n");
fprintf(stderr, "\nExamples:\n");
fprintf(stderr, "slcan_attach -w -o -f -s6 -c /dev/ttyS1\n");
fprintf(stderr, "slcan_attach /dev/ttyS1\n");
fprintf(stderr, "slcan_attach -d /dev/ttyS1\n");
fprintf(stderr, "slcan_attach -w -n can15 /dev/ttyS1\n");
fprintf(stderr, "\n");
exit(1);
}
int main(int argc, char **argv)
{
int fd;
int ldisc = N_SLCAN;
int detach = 0;
int waitkey = 0;
int send_open = 0;
int send_listen = 0;
int send_close = 0;
int send_read_status_flags = 0;
char *speed = NULL;
char *btr = NULL;
char buf[IFNAMSIZ+1];
char *tty;
char *name = NULL;
int opt;
while ((opt = getopt(argc, argv, "ldwocfs:b:n:?")) != -1) {
switch (opt) {
case 'd':
detach = 1;
break;
case 'w':
waitkey = 1;
break;
case 'o':
send_open = 1;
break;
case 'l':
send_listen = 1;
break;
case 'c':
send_close = 1;
break;
case 'f':
send_read_status_flags = 1;
break;
case 's':
speed = optarg;
if (strlen(speed) > 1)
print_usage(argv[0]);
break;
case 'b':
btr = optarg;
if (strlen(btr) > 6)
print_usage(argv[0]);
break;
case 'n':
name = optarg;
if (strlen(name) > IFNAMSIZ-1)
print_usage(argv[0]);
break;
case '?':
default:
print_usage(argv[0]);
break;
}
}
if (argc - optind != 1)
print_usage(argv[0]);
tty = argv[optind];
if ((fd = open (tty, O_WRONLY | O_NOCTTY)) < 0) {
perror(tty);
exit(1);
}
if (waitkey || !detach) {
if (speed) {
sprintf(buf, "C\rS%s\r", speed);
write(fd, buf, strlen(buf));
}
if (btr) {
sprintf(buf, "C\rs%s\r", btr);
write(fd, buf, strlen(buf));
}
if (send_read_status_flags) {
sprintf(buf, "F\r");
write(fd, buf, strlen(buf));
}
if (send_listen) {
sprintf(buf, "L\r");
write(fd, buf, strlen(buf));
} else if (send_open) {
sprintf(buf, "O\r");
write(fd, buf, strlen(buf));
}
/* set slcan line discipline on given tty */
if (ioctl (fd, TIOCSETD, &ldisc) < 0) {
perror("ioctl TIOCSETD");
exit(1);
}
/* retrieve the name of the created CAN netdevice */
if (ioctl (fd, SIOCGIFNAME, buf) < 0) {
perror("ioctl SIOCGIFNAME");
exit(1);
}
printf("attached tty %s to netdevice %s\n", tty, buf);
/* try to rename the created device if requested */
if (name) {
struct ifreq ifr;
int s = socket(PF_INET, SOCK_DGRAM, 0);
printf("rename netdevice %s to %s ... ", buf, name);
if (s < 0)
perror("socket for interface rename");
else {
strncpy (ifr.ifr_name, buf, IFNAMSIZ);
strncpy (ifr.ifr_newname, name, IFNAMSIZ);
if (ioctl(s, SIOCSIFNAME, &ifr) < 0)
printf("failed!\n");
else
printf("ok.\n");
close(s);
}
}
}
if (waitkey) {
printf("Press any key to detach %s ...\n", tty);
getchar();
}
if (waitkey || detach) {
ldisc = N_TTY;
if (ioctl (fd, TIOCSETD, &ldisc) < 0) {
perror("ioctl");
exit(1);
}
if (send_close) {
sprintf(buf, "C\r");
write(fd, buf, strlen(buf));
}
}
close(fd);
return 0;
}