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