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-rw-r--r--disk-utils/raw.c277
1 files changed, 277 insertions, 0 deletions
diff --git a/disk-utils/raw.c b/disk-utils/raw.c
new file mode 100644
index 0000000..8abcbb7
--- /dev/null
+++ b/disk-utils/raw.c
@@ -0,0 +1,277 @@
+/*
+ * 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);
+ atexit(close_stdout);
+
+ 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':
+ printf(UTIL_LINUX_VERSION);
+ return 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;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-21 12:28:11 +0000