/*
* 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 <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <linux/major.h>
#include <linux/raw.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <unistd.h>
#include "c.h"
#include "closestream.h"
#include "nls.h"
#include "pathnames.h"
#define EXIT_RAW_ACCESS 3
#define EXIT_RAW_IOCTL 4
#define RAW_NR_MINORS 8192
static int do_query;
static int do_query_all;
static int master_fd;
static int raw_minor;
void open_raw_ctl(void);
static int query(int minor_raw, const char *raw_name, int quiet);
static int bind(int minor_raw, int block_major, int block_minor);
static void __attribute__((__noreturn__)) usage(void)
{
FILE *out = stdout;
fputs(USAGE_HEADER, out);
fprintf(out,
_(" %1$s %2$srawN <major> <minor>\n"
" %1$s %2$srawN /dev/<blockdevice>\n"
" %1$s -q %2$srawN\n"
" %1$s -qa\n"), program_invocation_short_name,
_PATH_RAWDEVDIR);
fputs(USAGE_SEPARATOR, out);
fputs(_("Bind a raw character device to a block device.\n"), out);
fputs(USAGE_OPTIONS, out);
fputs(_(" -q, --query set query mode\n"), out);
fputs(_(" -a, --all query all raw devices\n"), out);
printf(USAGE_HELP_OPTIONS(16));
printf(USAGE_MAN_TAIL("raw(8)"));
exit(EXIT_SUCCESS);
}
static long strtol_octal_or_err(const char *str, const char *errmesg)
{
long num;
char *end = NULL;
if (str == NULL || *str == '\0')
goto err;
errno = 0;
num = strtol(str, &end, 0);
if (errno || str == end || (end && *end))
goto err;
return num;
err:
if (errno)
err(EXIT_FAILURE, "%s: '%s'", errmesg, str);
else
errx(EXIT_FAILURE, "%s: '%s'", errmesg, str);
return 0;
}
int main(int argc, char *argv[])
{
int c;
char *raw_name;
char *block_name;
int retval;
int block_major, block_minor;
int i, rc;
struct stat statbuf;
static const struct option longopts[] = {
{"query", no_argument, NULL, 'q'},
{"all", no_argument, NULL, 'a'},
{"version", no_argument, NULL, 'V'},
{"help", no_argument, NULL, 'h'},
{NULL, 0, NULL, '0'},
};
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
close_stdout_atexit();
while ((c = getopt_long(argc, argv, "qaVh", longopts, NULL)) != -1)
switch (c) {
case 'q':
do_query = 1;
break;
case 'a':
do_query_all = 1;
break;
case 'V':
print_version(EXIT_SUCCESS);
case 'h':
usage();
default:
errtryhelp(EXIT_FAILURE);
}
/*
* Check for, and open, the master raw device, /dev/raw
*/
open_raw_ctl();
if (do_query_all) {
if (optind < argc) {
warnx(_("bad usage"));
errtryhelp(EXIT_FAILURE);
}
for (i = 1; i < RAW_NR_MINORS; i++)
query(i, NULL, 1);
exit(EXIT_SUCCESS);
}
/*
* It's a bind or a single query. Either way we need a raw device.
*/
if (optind >= argc) {
warnx(_("bad usage"));
errtryhelp(EXIT_FAILURE);
}
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, _PATH_RAWDEVDIR "raw%d", &raw_minor);
if (rc != 1) {
warnx(_("bad usage"));
errtryhelp(EXIT_FAILURE);
}
if (raw_minor == 0)
errx(EXIT_RAW_ACCESS,
_("Device '%s' is the control raw device "
"(use raw<N> where <N> is greater than zero)"),
raw_name);
if (do_query)
return query(raw_minor, raw_name, 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];
retval = stat(block_name, &statbuf);
if (retval)
err(EXIT_RAW_ACCESS,
_("Cannot locate block device '%s'"), block_name);
if (!S_ISBLK(statbuf.st_mode))
errx(EXIT_RAW_ACCESS,
_("Device '%s' is not a block device"),
block_name);
block_major = major(statbuf.st_rdev);
block_minor = minor(statbuf.st_rdev);
break;
case 2:
block_major =
strtol_octal_or_err(argv[optind],
_("failed to parse argument"));
block_minor =
strtol_octal_or_err(argv[optind + 1],
_("failed to parse argument"));
break;
default:
warnx(_("bad usage"));
errtryhelp(EXIT_FAILURE);
}
return bind(raw_minor, block_major, block_minor);
}
void open_raw_ctl(void)
{
master_fd = open(_PATH_RAWDEVCTL, O_RDWR, 0);
if (master_fd < 0) {
master_fd = open(_PATH_RAWDEVCTL_OLD, O_RDWR, 0);
if (master_fd < 0)
err(EXIT_RAW_ACCESS,
_("Cannot open master raw device '%s'"),
_PATH_RAWDEVCTL);
}
}
static int query(int minor_raw, const char *raw_name, int quiet)
{
struct raw_config_request rq;
static int has_worked = 0;
if (raw_name) {
struct stat statbuf;
if (stat(raw_name, &statbuf) != 0)
err(EXIT_RAW_ACCESS,
_("Cannot locate raw device '%s'"), raw_name);
if (!S_ISCHR(statbuf.st_mode))
errx(EXIT_RAW_ACCESS,
_("Raw device '%s' is not a character dev"),
raw_name);
if (major(statbuf.st_rdev) != RAW_MAJOR)
errx(EXIT_RAW_ACCESS,
_("Device '%s' is not a raw dev"), raw_name);
minor_raw = minor(statbuf.st_rdev);
}
rq.raw_minor = minor_raw;
if (ioctl(master_fd, RAW_GETBIND, &rq) < 0) {
if (quiet && errno == ENODEV)
return 3;
if (has_worked && errno == EINVAL)
return 0;
err(EXIT_RAW_IOCTL, _("Error querying raw device"));
}
/* 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(_("%sraw%d: bound to major %d, minor %d\n"),
_PATH_RAWDEVDIR, minor_raw, (int)rq.block_major,
(int)rq.block_minor);
return 0;
}
static int bind(int minor_raw, int block_major, int block_minor)
{
struct raw_config_request rq;
rq.raw_minor = minor_raw;
rq.block_major = block_major;
rq.block_minor = block_minor;
if (ioctl(master_fd, RAW_SETBIND, &rq) < 0)
err(EXIT_RAW_IOCTL, _("Error setting raw device"));
printf(_("%sraw%d: bound to major %d, minor %d\n"),
_PATH_RAWDEVDIR, raw_minor, (int)rq.block_major,
(int)rq.block_minor);
return 0;
}
