/*
* raw.c: User mode tool to bind and query raw character devices.
*
* Stephen Tweedie, 1999, 2000
*
* This file may be redistributed under the terms of the GNU General
* Public License, version 2.
*
* Copyright Red Hat Software, 1999, 2000
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/sysmacros.h>
#include <linux/raw.h>
#include <linux/major.h>
#ifdef OLD_RAW_DEVS
#define RAWCTLDEV "/dev/raw"
#define RAWDEVDIR "/dev/"
#else
#define RAWCTLDEV "/dev/rawctl"
#define RAWDEVDIR "/dev/raw/"
#endif
#define DEVFS_RAWCTLDEV "/dev/raw/rawctl"
#define RAW_NR_MINORS 8192
char * progname;
int do_query = 0;
int do_query_all = 0;
int master_fd;
int raw_minor;
void open_raw_ctl(void);
int query(int minor, int quiet);
int bind (int minor, int block_major, int block_minor);
static void usage(int err)
{
fprintf(stderr,
"Usage:\n"
" %s " RAWDEVDIR "rawN <major> <minor>\n"
" %s " RAWDEVDIR "rawN /dev/<blockdev>\n"
" %s -q " RAWDEVDIR "rawN\n"
" %s -qa\n",
progname, progname, progname, progname);
exit(err);
}
int main(int argc, char *argv[])
{
int c;
char * raw_name;
char * block_name;
int err;
int block_major, block_minor;
int i, rc;
struct stat statbuf;
progname = argv[0];
while ((c = getopt(argc, argv, "ahq")) != -1) {
switch (c) {
case 'a':
do_query_all = 1;
break;
case 'h':
usage(0);
case 'q':
do_query = 1;
break;
default:
usage(1);
}
}
/*
* Check for, and open, the master raw device, /dev/raw
*/
open_raw_ctl();
if (do_query_all) {
if (optind < argc)
usage(1);
for (i = 1; i < RAW_NR_MINORS; i++)
query(i, 1);
exit(0);
}
/*
* It's a bind or a single query. Either way we need a raw device.
*/
if (optind >= argc)
usage(1);
raw_name = argv[optind++];
/*
* try to check the device name before stat(), because on systems with
* udev the raw0 causes a create udev event for char 162/0, which
* causes udev to *remove* /dev/rawctl
*/
rc = sscanf(raw_name, RAWDEVDIR "raw%d", &raw_minor);
if (rc == 1 && raw_minor == 0) {
fprintf (stderr,
"Device '%s' is control raw dev "
"(use raw<N> where <N> is greater than zero)\n",
raw_name);
exit(2);
}
err = stat(raw_name, &statbuf);
if (err) {
fprintf (stderr, "Cannot locate raw device '%s' (%s)\n",
raw_name, strerror(errno));
exit(2);
}
if (!S_ISCHR(statbuf.st_mode)) {
fprintf (stderr, "Raw device '%s' is not a character dev\n",
raw_name);
exit(2);
}
if (major(statbuf.st_rdev) != RAW_MAJOR) {
fprintf (stderr, "Device '%s' is not a raw dev\n",
raw_name);
exit(2);
}
raw_minor = minor(statbuf.st_rdev);
if (do_query)
return query(raw_minor, 0);
/*
* It's not a query, so we still have some parsing to do. Have
* we been given a block device filename or a major/minor pair?
*/
switch (argc - optind) {
case 1:
block_name = argv[optind];
err = stat(block_name, &statbuf);
if (err) {
fprintf (stderr,
"Cannot locate block device '%s' (%s)\n",
block_name, strerror(errno));
exit(2);
}
if (!S_ISBLK(statbuf.st_mode)) {
fprintf (stderr, "Device '%s' is not a block dev\n",
block_name);
exit(2);
}
block_major = major(statbuf.st_rdev);
block_minor = minor(statbuf.st_rdev);
break;
case 2:
block_major = strtol(argv[optind], 0, 0);
block_minor = strtol(argv[optind+1], 0, 0);
break;
default:
block_major = block_minor = 0; /* just to keep gcc happy */
usage(1);
}
return bind(raw_minor, block_major, block_minor);
return 0;
}
void open_raw_ctl(void)
{
int errsv;
master_fd = open(RAWCTLDEV, O_RDWR, 0);
if (master_fd < 0) {
errsv = errno;
master_fd = open(DEVFS_RAWCTLDEV, O_RDWR, 0);
if (master_fd < 0) {
fprintf (stderr,
"Cannot open master raw device '"
RAWCTLDEV
"' (%s)\n", strerror(errsv));
exit(2);
}
}
}
int query(int minor, int quiet)
{
struct raw_config_request rq;
static int has_worked = 0;
int err;
rq.raw_minor = minor;
err = ioctl(master_fd, RAW_GETBIND, &rq);
if (err < 0) {
if (quiet && errno == ENODEV)
return 3;
if (has_worked && errno == EINVAL)
return 0;
fprintf (stderr,
"Error querying raw device (%s)\n",
strerror(errno));
exit(3);
}
/* If one query has worked, mark that fact so that we don't
* report spurious fatal errors if raw(8) has been built to
* support more raw minor numbers than the kernel has. */
has_worked = 1;
if (quiet && !rq.block_major && !rq.block_minor)
return 0;
printf (RAWDEVDIR "raw%d: bound to major %d, minor %d\n",
minor, (int) rq.block_major, (int) rq.block_minor);
return 0;
}
int bind(int minor, int block_major, int block_minor)
{
struct raw_config_request rq;
int err;
rq.raw_minor = minor;
rq.block_major = block_major;
rq.block_minor = block_minor;
err = ioctl(master_fd, RAW_SETBIND, &rq);
if (err < 0) {
fprintf (stderr,
"Error setting raw device (%s)\n",
strerror(errno));
exit(3);
}
printf (RAWDEVDIR "raw%d: bound to major %d, minor %d\n",
raw_minor, (int) rq.block_major, (int) rq.block_minor);
return 0;
}
