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/****************************************************************************
* bfs *
* Copyright (C) 2017 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 <errno.h>
#include <stdlib.h>
#include <string.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/types.h>
#if __GLIBC__
# include <mntent.h>
#elif BSD
# include <sys/mount.h>
# include <sys/ucred.h>
#endif
/**
* A mount point in the mount table.
*/
struct bfs_mtab_entry {
/** The device number for this mount point. */
dev_t dev;
/** The file system type of this mount point. */
char *type;
};
struct bfs_mtab {
/** The array of mtab entries. */
struct bfs_mtab_entry *table;
/** The size of the array. */
size_t size;
/** Capacity of the array. */
size_t capacity;
};
/**
* Add an entry to the mount table.
*/
static int bfs_mtab_push(struct bfs_mtab *mtab, dev_t dev, const char *type) {
size_t size = mtab->size + 1;
if (size >= mtab->capacity) {
size_t capacity = 2*size;
struct bfs_mtab_entry *table = realloc(mtab->table, capacity*sizeof(*table));
if (!table) {
return -1;
}
mtab->table = table;
mtab->capacity = capacity;
}
struct bfs_mtab_entry *entry = mtab->table + (size - 1);
entry->dev = dev;
entry->type = strdup(type);
if (!entry->type) {
return -1;
}
mtab->size = size;
return 0;
}
struct bfs_mtab *parse_bfs_mtab() {
#if __GLIBC__
FILE *file = setmntent(_PATH_MOUNTED, "r");
if (!file) {
goto fail;
}
struct bfs_mtab *mtab = malloc(sizeof(*mtab));
if (!mtab) {
goto fail_file;
}
mtab->table = NULL;
mtab->size = 0;
mtab->capacity = 0;
struct mntent *mnt;
while ((mnt = getmntent(file))) {
struct stat sb;
if (stat(mnt->mnt_dir, &sb) != 0) {
continue;
}
if (bfs_mtab_push(mtab, sb.st_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 BSD
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;
}
mtab->size = 0;
mtab->table = malloc(size*sizeof(*mtab->table));
if (!mtab->table) {
goto fail_mtab;
}
mtab->capacity = size;
for (struct statfs *mnt = mntbuf; mnt < mntbuf + size; ++mnt) {
struct stat sb;
if (stat(mnt->f_mntonname, &sb) != 0) {
continue;
}
if (bfs_mtab_push(mtab, sb.st_dev, mnt->f_fstypename) != 0) {
goto fail_mtab;
}
}
return mtab;
fail_mtab:
free_bfs_mtab(mtab);
fail:
return NULL;
#else
errno = ENOTSUP;
return NULL;
#endif
}
const char *bfs_fstype(const struct bfs_mtab *mtab, const struct stat *statbuf) {
for (struct bfs_mtab_entry *mnt = mtab->table; mnt < mtab->table + mtab->size; ++mnt) {
if (statbuf->st_dev == mnt->dev) {
return mnt->type;
}
}
return "unknown";
}
void free_bfs_mtab(struct bfs_mtab *mtab) {
if (mtab) {
for (struct bfs_mtab_entry *mnt = mtab->table; mnt < mtab->table + mtab->size; ++mnt) {
free(mnt->type);
}
free(mtab->table);
free(mtab);
}
}
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