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/****************************************************************************
* bfs *
* Copyright (C) 2017-2019 Tavian Barnes <tavianator@tavianator.com> *
* *
* Permission to use, copy, modify, and/or distribute this software for any *
* purpose with or without fee is hereby granted. *
* *
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES *
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF *
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR *
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES *
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN *
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF *
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. *
****************************************************************************/
#include "mtab.h"
#include "trie.h"
#include "util.h"
#include <errno.h>
#include <fcntl.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#if BFS_HAS_SYS_PARAM
# include <sys/param.h>
#endif
#if BFS_HAS_MNTENT
# define BFS_MNTENT 1
#elif BSD
# define BFS_MNTINFO 1
#elif __SVR4
# define BFS_MNTTAB 1
#endif
#if BFS_MNTENT
# include <mntent.h>
# include <paths.h>
# include <stdio.h>
#elif BFS_MNTINFO
# include <sys/mount.h>
# include <sys/ucred.h>
#elif BFS_MNTTAB
# include <stdio.h>
# include <sys/mnttab.h>
#endif
struct bfs_mtab {
/** A map from device ID to file system type. */
struct trie types;
/** The names of all the mount points. */
struct trie names;
};
/**
* Add an entry to the mount table.
*/
static int bfs_mtab_add(struct bfs_mtab *mtab, const char *path, dev_t dev, const char *type) {
if (!trie_insert_str(&mtab->names, xbasename(path))) {
return -1;
}
struct trie_leaf *leaf = trie_insert_mem(&mtab->types, &dev, sizeof(dev));
if (!leaf) {
return -1;
}
if (leaf->value) {
return 0;
}
leaf->value = strdup(type);
if (leaf->value) {
return 0;
} else {
trie_remove(&mtab->types, leaf);
return -1;
}
}
struct bfs_mtab *parse_bfs_mtab() {
#if BFS_MNTENT
FILE *file = setmntent(_PATH_MOUNTED, "r");
if (!file) {
// In case we're in a chroot or something with /proc but no /etc/mtab
file = setmntent("/proc/mounts", "r");
}
if (!file) {
goto fail;
}
struct bfs_mtab *mtab = malloc(sizeof(*mtab));
if (!mtab) {
goto fail_file;
}
trie_init(&mtab->types);
trie_init(&mtab->names);
struct mntent *mnt;
while ((mnt = getmntent(file))) {
struct bfs_stat sb;
if (bfs_stat(AT_FDCWD, mnt->mnt_dir, BFS_STAT_NOFOLLOW, &sb) != 0) {
continue;
}
if (bfs_mtab_add(mtab, mnt->mnt_dir, sb.dev, mnt->mnt_type) != 0) {
goto fail_mtab;
}
}
endmntent(file);
return mtab;
fail_mtab:
free_bfs_mtab(mtab);
fail_file:
endmntent(file);
fail:
return NULL;
#elif BFS_MNTINFO
struct statfs *mntbuf;
int size = getmntinfo(&mntbuf, MNT_WAIT);
if (size < 0) {
return NULL;
}
struct bfs_mtab *mtab = malloc(sizeof(*mtab));
if (!mtab) {
goto fail;
}
trie_init(&mtab->types);
trie_init(&mtab->names);
for (struct statfs *mnt = mntbuf; mnt < mntbuf + size; ++mnt) {
struct bfs_stat sb;
if (bfs_stat(AT_FDCWD, mnt->f_mntonname, BFS_STAT_NOFOLLOW, &sb) != 0) {
continue;
}
if (bfs_mtab_add(mtab, mnt->f_mntonname, sb.dev, mnt->f_fstypename) != 0) {
goto fail_mtab;
}
}
return mtab;
fail_mtab:
free_bfs_mtab(mtab);
fail:
return NULL;
#elif BFS_MNTTAB
FILE *file = fopen(MNTTAB, "r");
if (!file) {
goto fail;
}
struct bfs_mtab *mtab = malloc(sizeof(*mtab));
if (!mtab) {
goto fail_file;
}
trie_init(&mtab->types);
trie_init(&mtab->names);
struct mnttab mnt;
while (getmntent(file, &mnt) == 0) {
struct bfs_stat sb;
if (bfs_stat(AT_FDCWD, mnt.mnt_mountp, BFS_STAT_NOFOLLOW, &sb) != 0) {
continue;
}
if (bfs_mtab_add(mtab, mnt.mnt_mountp, sb.dev, mnt.mnt_fstype) != 0) {
goto fail_mtab;
}
}
fclose(file);
return mtab;
fail_mtab:
free_bfs_mtab(mtab);
fail_file:
fclose(file);
fail:
return NULL;
#else
errno = ENOTSUP;
return NULL;
#endif
}
const char *bfs_fstype(const struct bfs_mtab *mtab, const struct bfs_stat *statbuf) {
const struct trie_leaf *leaf = trie_find_mem(&mtab->types, &statbuf->dev, sizeof(statbuf->dev));
if (leaf) {
return leaf->value;
} else {
return "unknown";
}
}
bool bfs_maybe_mount(const struct bfs_mtab *mtab, const char *path) {
const char *name = xbasename(path);
return trie_find_str(&mtab->names, name);
}
void free_bfs_mtab(struct bfs_mtab *mtab) {
if (mtab) {
trie_destroy(&mtab->names);
struct trie_leaf *leaf;
while ((leaf = trie_first_leaf(&mtab->types))) {
free(leaf->value);
trie_remove(&mtab->types, leaf);
}
trie_destroy(&mtab->types);
free(mtab);
}
}
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