277 lines
6.4 KiB
C
277 lines
6.4 KiB
C
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/*
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* raw.c: User mode tool to bind and query raw character devices.
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*
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* Stephen Tweedie, 1999, 2000
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*
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* This file may be redistributed under the terms of the GNU General
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* Public License, version 2.
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*
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* Copyright Red Hat Software, 1999, 2000
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*
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <getopt.h>
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#include <linux/major.h>
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#include <linux/raw.h>
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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 <sys/ioctl.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "c.h"
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#include "closestream.h"
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#include "nls.h"
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#include "pathnames.h"
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#define EXIT_RAW_ACCESS 3
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#define EXIT_RAW_IOCTL 4
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#define RAW_NR_MINORS 8192
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static int do_query;
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static int do_query_all;
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static int master_fd;
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static int raw_minor;
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void open_raw_ctl(void);
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static int query(int minor_raw, const char *raw_name, int quiet);
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static int bind(int minor_raw, int block_major, int block_minor);
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static void __attribute__((__noreturn__)) usage(void)
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{
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FILE *out = stdout;
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fputs(USAGE_HEADER, out);
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fprintf(out,
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_(" %1$s %2$srawN <major> <minor>\n"
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" %1$s %2$srawN /dev/<blockdevice>\n"
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" %1$s -q %2$srawN\n"
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" %1$s -qa\n"), program_invocation_short_name,
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_PATH_RAWDEVDIR);
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fputs(USAGE_SEPARATOR, out);
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fputs(_("Bind a raw character device to a block device.\n"), out);
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fputs(USAGE_OPTIONS, out);
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fputs(_(" -q, --query set query mode\n"), out);
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fputs(_(" -a, --all query all raw devices\n"), out);
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printf(USAGE_HELP_OPTIONS(16));
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printf(USAGE_MAN_TAIL("raw(8)"));
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exit(EXIT_SUCCESS);
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}
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static long strtol_octal_or_err(const char *str, const char *errmesg)
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{
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long num;
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char *end = NULL;
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if (str == NULL || *str == '\0')
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goto err;
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errno = 0;
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num = strtol(str, &end, 0);
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if (errno || str == end || (end && *end))
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goto err;
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return num;
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err:
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if (errno)
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err(EXIT_FAILURE, "%s: '%s'", errmesg, str);
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else
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errx(EXIT_FAILURE, "%s: '%s'", errmesg, str);
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return 0;
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}
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int main(int argc, char *argv[])
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{
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int c;
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char *raw_name;
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char *block_name;
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int retval;
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int block_major, block_minor;
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int i, rc;
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struct stat statbuf;
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static const struct option longopts[] = {
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{"query", no_argument, NULL, 'q'},
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{"all", no_argument, NULL, 'a'},
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{"version", no_argument, NULL, 'V'},
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{"help", no_argument, NULL, 'h'},
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{NULL, 0, NULL, '0'},
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};
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setlocale(LC_ALL, "");
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bindtextdomain(PACKAGE, LOCALEDIR);
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textdomain(PACKAGE);
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close_stdout_atexit();
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while ((c = getopt_long(argc, argv, "qaVh", longopts, NULL)) != -1)
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switch (c) {
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case 'q':
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do_query = 1;
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break;
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case 'a':
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do_query_all = 1;
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break;
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case 'V':
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print_version(EXIT_SUCCESS);
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case 'h':
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usage();
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default:
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errtryhelp(EXIT_FAILURE);
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}
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/*
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* Check for, and open, the master raw device, /dev/raw
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*/
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open_raw_ctl();
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if (do_query_all) {
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if (optind < argc) {
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warnx(_("bad usage"));
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errtryhelp(EXIT_FAILURE);
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}
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for (i = 1; i < RAW_NR_MINORS; i++)
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query(i, NULL, 1);
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exit(EXIT_SUCCESS);
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}
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/*
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* It's a bind or a single query. Either way we need a raw device.
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*/
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if (optind >= argc) {
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warnx(_("bad usage"));
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errtryhelp(EXIT_FAILURE);
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}
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raw_name = argv[optind++];
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/*
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* try to check the device name before stat(), because on systems with
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* udev the raw0 causes a create udev event for char 162/0, which
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* causes udev to *remove* /dev/rawctl
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*/
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rc = sscanf(raw_name, _PATH_RAWDEVDIR "raw%d", &raw_minor);
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if (rc != 1) {
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warnx(_("bad usage"));
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errtryhelp(EXIT_FAILURE);
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}
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if (raw_minor == 0)
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errx(EXIT_RAW_ACCESS,
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_("Device '%s' is the control raw device "
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"(use raw<N> where <N> is greater than zero)"),
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raw_name);
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if (do_query)
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return query(raw_minor, raw_name, 0);
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/*
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* It's not a query, so we still have some parsing to do. Have we been
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* given a block device filename or a major/minor pair?
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*/
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switch (argc - optind) {
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case 1:
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block_name = argv[optind];
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retval = stat(block_name, &statbuf);
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if (retval)
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err(EXIT_RAW_ACCESS,
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_("Cannot locate block device '%s'"), block_name);
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if (!S_ISBLK(statbuf.st_mode))
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errx(EXIT_RAW_ACCESS,
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_("Device '%s' is not a block device"),
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block_name);
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block_major = major(statbuf.st_rdev);
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block_minor = minor(statbuf.st_rdev);
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break;
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case 2:
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block_major =
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strtol_octal_or_err(argv[optind],
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_("failed to parse argument"));
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block_minor =
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strtol_octal_or_err(argv[optind + 1],
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_("failed to parse argument"));
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break;
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default:
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warnx(_("bad usage"));
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errtryhelp(EXIT_FAILURE);
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}
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return bind(raw_minor, block_major, block_minor);
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}
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void open_raw_ctl(void)
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{
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master_fd = open(_PATH_RAWDEVCTL, O_RDWR, 0);
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if (master_fd < 0) {
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master_fd = open(_PATH_RAWDEVCTL_OLD, O_RDWR, 0);
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if (master_fd < 0)
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err(EXIT_RAW_ACCESS,
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_("Cannot open master raw device '%s'"),
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_PATH_RAWDEVCTL);
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}
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}
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static int query(int minor_raw, const char *raw_name, int quiet)
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{
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struct raw_config_request rq;
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static int has_worked = 0;
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if (raw_name) {
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struct stat statbuf;
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if (stat(raw_name, &statbuf) != 0)
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err(EXIT_RAW_ACCESS,
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_("Cannot locate raw device '%s'"), raw_name);
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if (!S_ISCHR(statbuf.st_mode))
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errx(EXIT_RAW_ACCESS,
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_("Raw device '%s' is not a character dev"),
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raw_name);
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if (major(statbuf.st_rdev) != RAW_MAJOR)
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errx(EXIT_RAW_ACCESS,
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_("Device '%s' is not a raw dev"), raw_name);
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minor_raw = minor(statbuf.st_rdev);
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}
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rq.raw_minor = minor_raw;
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if (ioctl(master_fd, RAW_GETBIND, &rq) < 0) {
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if (quiet && errno == ENODEV)
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return 3;
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if (has_worked && errno == EINVAL)
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return 0;
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err(EXIT_RAW_IOCTL, _("Error querying raw device"));
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}
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/* If one query has worked, mark that fact so that we don't report
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* spurious fatal errors if raw(8) has been built to support more raw
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* minor numbers than the kernel has. */
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has_worked = 1;
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if (quiet && !rq.block_major && !rq.block_minor)
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return 0;
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printf(_("%sraw%d: bound to major %d, minor %d\n"),
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_PATH_RAWDEVDIR, minor_raw, (int)rq.block_major,
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(int)rq.block_minor);
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return 0;
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}
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static int bind(int minor_raw, int block_major, int block_minor)
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{
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struct raw_config_request rq;
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rq.raw_minor = minor_raw;
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rq.block_major = block_major;
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rq.block_minor = block_minor;
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if (ioctl(master_fd, RAW_SETBIND, &rq) < 0)
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err(EXIT_RAW_IOCTL, _("Error setting raw device"));
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printf(_("%sraw%d: bound to major %d, minor %d\n"),
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_PATH_RAWDEVDIR, raw_minor, (int)rq.block_major,
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(int)rq.block_minor);
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return 0;
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}
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