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-rw-r--r--src/rc/mountinfo.c464
1 files changed, 464 insertions, 0 deletions
diff --git a/src/rc/mountinfo.c b/src/rc/mountinfo.c
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+/*
+ mountinfo.c
+ Obtains information about mounted filesystems.
+ */
+
+/*
+ * Copyright 2007 Roy Marples
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ */
+
+#include <sys/types.h>
+
+#if defined(__DragonFly__) || defined(__FreeBSD__) || \
+ defined(__NetBSD__) || defined(__OpenBSD__)
+#define BSD
+#include <sys/param.h>
+#include <sys/ucred.h>
+#include <sys/mount.h>
+#elif defined (__linux__)
+#include <mntent.h>
+#endif
+
+#include <errno.h>
+#include <getopt.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <regex.h>
+
+#include "builtins.h"
+#include "einfo.h"
+#include "rc.h"
+#include "rc-misc.h"
+#include "strlist.h"
+
+static const char *applet;
+
+typedef enum {
+ mount_from,
+ mount_to,
+ mount_fstype,
+ mount_options
+} mount_type;
+
+typedef enum {
+ net_ignore,
+ net_yes,
+ net_no
+} net_opts;
+
+struct args {
+ regex_t *node_regex;
+ regex_t *skip_node_regex;
+ regex_t *fstype_regex;
+ regex_t *skip_fstype_regex;
+ regex_t *options_regex;
+ regex_t *skip_options_regex;
+ char **mounts;
+ mount_type mount_type;
+ net_opts netdev;
+};
+
+static int process_mount (char ***list, struct args *args,
+ char *from, char *to, char *fstype, char *options,
+ int netdev)
+{
+ char *p;
+
+ errno = ENOENT;
+
+#ifdef __linux__
+ /* Skip the really silly rootfs */
+ if (strcmp (fstype, "rootfs") == 0)
+ return (-1);
+#endif
+
+ if (args->netdev == net_yes && (netdev != -1 || args->mounts)) {
+ if (netdev != 0)
+ return (1);
+ } else if (args->netdev == net_no && (netdev != -1 || args->mounts)) {
+ if (netdev != 1)
+ return (1);
+ } else {
+ if (args->node_regex &&
+ regexec (args->node_regex, from, 0, NULL, 0) != 0)
+ return (1);
+ if (args->skip_node_regex &&
+ regexec (args->skip_node_regex, from, 0, NULL, 0) == 0)
+ return (1);
+
+ if (args->fstype_regex &&
+ regexec (args->fstype_regex, fstype, 0, NULL, 0) != 0)
+ return (-1);
+ if (args->skip_fstype_regex &&
+ regexec (args->skip_fstype_regex, fstype, 0, NULL, 0) == 0)
+ return (-1);
+
+ if (args->options_regex &&
+ regexec (args->options_regex, options, 0, NULL, 0) != 0)
+ return (-1);
+ if (args->skip_options_regex &&
+ regexec (args->skip_options_regex, options, 0, NULL, 0) == 0)
+ return (-1);
+ }
+
+ if (args->mounts) {
+ bool found = false;
+ int j;
+ char *mnt;
+ STRLIST_FOREACH (args->mounts, mnt, j)
+ if (strcmp (mnt, to) == 0) {
+ found = true;
+ break;
+ }
+ if (! found)
+ return (-1);
+ }
+
+ switch (args->mount_type) {
+ case mount_from:
+ p = from;
+ break;
+ case mount_to:
+ p = to;
+ break;
+ case mount_fstype:
+ p = fstype;
+ break;
+ case mount_options:
+ p = options;
+ break;
+ default:
+ p = NULL;
+ errno = EINVAL;
+ break;
+ }
+
+ if (p) {
+ errno = 0;
+ rc_strlist_addsortc (list, p);
+ return (0);
+ }
+
+ return (-1);
+}
+
+#ifdef BSD
+
+/* Translate the mounted options to english
+ * This is taken directly from FreeBSD mount.c */
+static struct opt {
+ int o_opt;
+ const char *o_name;
+} optnames[] = {
+ { MNT_ASYNC, "asynchronous" },
+ { MNT_EXPORTED, "NFS exported" },
+ { MNT_LOCAL, "local" },
+ { MNT_NOATIME, "noatime" },
+ { MNT_NOEXEC, "noexec" },
+ { MNT_NOSUID, "nosuid" },
+ { MNT_NOSYMFOLLOW, "nosymfollow" },
+ { MNT_QUOTA, "with quotas" },
+ { MNT_RDONLY, "read-only" },
+ { MNT_SYNCHRONOUS, "synchronous" },
+ { MNT_UNION, "union" },
+ { MNT_NOCLUSTERR, "noclusterr" },
+ { MNT_NOCLUSTERW, "noclusterw" },
+ { MNT_SUIDDIR, "suiddir" },
+ { MNT_SOFTDEP, "soft-updates" },
+ { MNT_MULTILABEL, "multilabel" },
+ { MNT_ACLS, "acls" },
+#ifdef MNT_GJOURNAL
+ { MNT_GJOURNAL, "gjournal" },
+#endif
+ { 0, NULL }
+};
+
+static char **find_mounts (struct args *args)
+{
+ struct statfs *mnts;
+ int nmnts;
+ int i;
+ char **list = NULL;
+ char *options = NULL;
+ int flags;
+ struct opt *o;
+
+ if ((nmnts = getmntinfo (&mnts, MNT_NOWAIT)) == 0)
+ eerrorx ("getmntinfo: %s", strerror (errno));
+
+ for (i = 0; i < nmnts; i++) {
+ int netdev = 0;
+ flags = mnts[i].f_flags & MNT_VISFLAGMASK;
+ for (o = optnames; flags && o->o_opt; o++) {
+ if (flags & o->o_opt) {
+ if (o->o_opt == MNT_LOCAL)
+ netdev = 1;
+ if (! options)
+ options = xstrdup (o->o_name);
+ else {
+ char *tmp = NULL;
+ int l = strlen (options) + strlen (o->o_name) + 2;
+ tmp = xmalloc (sizeof (char) * l);
+ snprintf (tmp, l, "%s,%s", options, o->o_name);
+ free (options);
+ options = tmp;
+ }
+ }
+ flags &= ~o->o_opt;
+ }
+
+ process_mount (&list, args,
+ mnts[i].f_mntfromname,
+ mnts[i].f_mntonname,
+ mnts[i].f_fstypename,
+ options,
+ netdev);
+
+ free (options);
+ options = NULL;
+ }
+
+ return (list);
+}
+
+#elif defined (__linux__)
+static struct mntent *getmntfile (const char *file)
+{
+ struct mntent *ent = NULL;
+ FILE *fp;
+
+ fp = setmntent ("/etc/fstab", "r");
+ while ((ent = getmntent (fp)))
+ if (strcmp (file, ent->mnt_dir) == 0)
+ break;
+ endmntent (fp);
+
+ return (ent);
+}
+
+static char **find_mounts (struct args *args)
+{
+ FILE *fp;
+ char *buffer;
+ char *p;
+ char *from;
+ char *to;
+ char *fst;
+ char *opts;
+ char **list = NULL;
+ struct mntent *ent;
+ int netdev;
+
+ if ((fp = fopen ("/proc/mounts", "r")) == NULL)
+ eerrorx ("getmntinfo: %s", strerror (errno));
+
+ buffer = xmalloc (sizeof (char) * PATH_MAX * 3);
+ while (fgets (buffer, PATH_MAX * 3, fp)) {
+ netdev = -1;
+ p = buffer;
+ from = strsep (&p, " ");
+ to = strsep (&p, " ");
+ fst = strsep (&p, " ");
+ opts = strsep (&p, " ");
+
+ if ((ent = getmntfile (to))) {
+ if (strstr (ent->mnt_opts, "_netdev"))
+ netdev = 0;
+ }
+
+ process_mount (&list, args, from, to, fst, opts, netdev);
+ }
+ free (buffer);
+ fclose (fp);
+
+ return (list);
+}
+
+#else
+# error "Operating system not supported!"
+#endif
+
+static regex_t *get_regex (const char *string)
+{
+ regex_t *reg = xmalloc (sizeof (regex_t));
+ int result;
+ char buffer[256];
+
+ if ((result = regcomp (reg, string, REG_EXTENDED | REG_NOSUB)) != 0)
+ {
+ regerror (result, reg, buffer, sizeof (buffer));
+ eerrorx ("%s: invalid regex `%s'", applet, buffer);
+ }
+
+ return (reg);
+}
+
+#include "_usage.h"
+#define extraopts "[mount1] [mount2] ..."
+#define getoptstring "f:F:n:N:o:O:p:P:ist" getoptstring_COMMON
+static struct option longopts[] = {
+ { "fstype-regex", 1, NULL, 'f'},
+ { "skip-fstype-regex", 1, NULL, 'F'},
+ { "node-regex", 1, NULL, 'n'},
+ { "skip-node-regex", 1, NULL, 'N'},
+ { "options-regex", 1, NULL, 'o'},
+ { "skip-options-regex", 1, NULL, 'O'},
+ { "point-regex", 1, NULL, 'p'},
+ { "skip-point-regex", 1, NULL, 'P'},
+ { "options", 0, NULL, 'i'},
+ { "fstype", 0, NULL, 's'},
+ { "node", 0, NULL, 't'},
+ { "netdev", 0, NULL, 'e'},
+ { "nonetdev", 0, NULL, 'E'},
+ longopts_COMMON
+};
+static const char * const longopts_help[] = {
+ "fstype regex to find",
+ "fstype regex to skip",
+ "node regex to find",
+ "node regex to skip",
+ "options regex to find",
+ "options regex to skip",
+ "point regex to find",
+ "point regex to skip",
+ "print options",
+ "print fstype",
+ "print node",
+ "is it a network device",
+ "is it not a network device",
+ longopts_help_COMMON
+};
+#include "_usage.c"
+
+int mountinfo (int argc, char **argv)
+{
+ int i;
+ struct args args;
+ regex_t *point_regex = NULL;
+ regex_t *skip_point_regex = NULL;
+ char **nodes = NULL;
+ char *n;
+ int opt;
+ int result;
+ bool quiet;
+
+ /* Ensure that we are only quiet when explicitly told to be */
+ unsetenv ("EINFO_QUIET");
+
+#define DO_REG(_var) \
+ if (_var) free (_var); \
+ _var = get_regex (optarg);
+#define REG_FREE(_var) \
+ if (_var) { regfree (_var); free (_var); }
+
+ memset (&args, 0, sizeof (struct args));
+ args.mount_type = mount_to;
+ args.netdev = net_ignore;
+
+ while ((opt = getopt_long (argc, argv, getoptstring,
+ longopts, (int *) 0)) != -1)
+ {
+ switch (opt) {
+ case 'e':
+ args.netdev = net_yes;
+ break;
+ case 'E':
+ args.netdev = net_no;
+ break;
+ case 'f':
+ DO_REG (args.fstype_regex);
+ break;
+ case 'F':
+ DO_REG (args.skip_fstype_regex);
+ break;
+ case 'n':
+ DO_REG (args.node_regex);
+ break;
+ case 'N':
+ DO_REG (args.skip_node_regex);
+ break;
+ case 'o':
+ DO_REG (args.options_regex);
+ break;
+ case 'O':
+ DO_REG (args.skip_options_regex);
+ break;
+ case 'p':
+ DO_REG (point_regex);
+ break;
+ case 'P':
+ DO_REG (skip_point_regex);
+ break;
+ case 'i':
+ args.mount_type = mount_options;
+ break;
+ case 's':
+ args.mount_type = mount_fstype;
+ break;
+ case 't':
+ args.mount_type = mount_from;
+ break;
+
+ case_RC_COMMON_GETOPT
+ }
+ }
+
+ while (optind < argc) {
+ if (argv[optind][0] != '/')
+ eerrorx ("%s: `%s' is not a mount point", argv[0], argv[optind]);
+ rc_strlist_add (&args.mounts, argv[optind++]);
+ }
+
+ nodes = find_mounts (&args);
+
+ REG_FREE (args.fstype_regex);
+ REG_FREE (args.skip_fstype_regex);
+ REG_FREE (args.node_regex);
+ REG_FREE (args.skip_node_regex);
+ REG_FREE (args.options_regex);
+ REG_FREE (args.skip_options_regex);
+
+ rc_strlist_reverse (nodes);
+
+ result = EXIT_FAILURE;
+ quiet = rc_yesno (getenv ("EINFO_QUIET"));
+ STRLIST_FOREACH (nodes, n, i) {
+ if (point_regex && regexec (point_regex, n, 0, NULL, 0) != 0)
+ continue;
+ if (skip_point_regex && regexec (skip_point_regex, n, 0, NULL, 0) == 0)
+ continue;
+ if (! quiet)
+ printf ("%s\n", n);
+ result = EXIT_SUCCESS;
+ }
+ rc_strlist_free (nodes);
+
+ REG_FREE (point_regex);
+ REG_FREE (skip_point_regex);
+
+ exit (result);
+}
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