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/* Copyright (C) 2021 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <dirent.h>
#include <fcntl.h>
#include <ftw.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include "contrib/files.h"
#include "contrib/string.h"
#include "libknot/errcode.h"
#if defined(MAXBSIZE)
#define BUFSIZE MAXBSIZE
#else
#define BUFSIZE (64 * 1024)
#endif
char* abs_path(const char *path, const char *base_dir)
{
if (path == NULL) {
return NULL;
} else if (path[0] == '/') {
return strdup(path);
} else {
char *full_path;
if (base_dir == NULL) {
char *cwd = realpath("./", NULL);
full_path = sprintf_alloc("%s/%s", cwd, path);
free(cwd);
} else {
full_path = sprintf_alloc("%s/%s", base_dir, path);
}
return full_path;
}
}
bool same_path(const char *path1, const char *path2)
{
bool equal = false;
int err = 0;
struct stat sb1;
if (stat(path1, &sb1) == 0) {
struct stat sb2;
if (stat(path2, &sb2) == 0) {
if (sb1.st_dev == sb2.st_dev &&
sb1.st_ino == sb2.st_ino) {
equal = true;
}
} else {
err = errno;
}
} else {
err = errno;
}
if (err != 0) {
// Can't compare real absolute paths, as stat() failed already. Try the best.
char *full_path1 = abs_path(path1, NULL);
char *full_path2 = abs_path(path2, NULL);
if (strcmp(full_path1, full_path2) == 0) {
equal = true;
}
free(full_path1);
free(full_path2);
}
return equal;
}
static int remove_file(const char *path, const struct stat *stat, int type, struct FTW *ftw)
{
(void)stat;
(void)ftw;
if (type == FTW_DP) {
return rmdir(path);
} else {
return unlink(path);
}
}
bool remove_path(const char *path)
{
return (0 == nftw(path, remove_file, 1, FTW_DEPTH | FTW_PHYS));
}
int make_dir(const char *path, mode_t mode, bool ignore_existing)
{
if (mkdir(path, mode) == 0) {
return KNOT_EOK;
}
if (!ignore_existing || errno != EEXIST) {
return knot_map_errno();
}
assert(errno == EEXIST);
struct stat st = { 0 };
if (stat(path, &st) != 0) {
return knot_map_errno();
}
if (!S_ISDIR(st.st_mode)) {
return KNOT_EEXIST;
}
return KNOT_EOK;
}
int make_path(const char *path, mode_t mode)
{
if (path == NULL) {
return KNOT_EINVAL;
}
char *dir = strdup(path);
if (dir == NULL) {
return KNOT_ENOMEM;
}
for (char *p = strchr(dir + 1, '/'); p != NULL; p = strchr(p + 1, '/')) {
*p = '\0';
if (mkdir(dir, mode) == -1 && errno != EEXIST) {
free(dir);
return knot_map_errno();
}
*p = '/';
}
free(dir);
return KNOT_EOK;
}
int open_tmp_file(const char *path, char **tmp_name, FILE **file, mode_t mode)
{
int ret;
*tmp_name = sprintf_alloc("%s.XXXXXX", path);
if (*tmp_name == NULL) {
ret = KNOT_ENOMEM;
goto open_tmp_failed;
}
int fd = mkstemp(*tmp_name);
if (fd < 0) {
ret = knot_map_errno();
goto open_tmp_failed;
}
if (fchmod(fd, mode) != 0) {
ret = knot_map_errno();
close(fd);
unlink(*tmp_name);
goto open_tmp_failed;
}
*file = fdopen(fd, "w");
if (*file == NULL) {
ret = knot_map_errno();
close(fd);
unlink(*tmp_name);
goto open_tmp_failed;
}
return KNOT_EOK;
open_tmp_failed:
free(*tmp_name);
*tmp_name = NULL;
*file = NULL;
assert(ret != KNOT_EOK);
return ret;
}
int copy_file(const char *dest, const char *src)
{
if (dest == NULL || src == NULL) {
return KNOT_EINVAL;
}
int ret = 0;
char *buf = NULL, *tmp_name = NULL;
FILE *file = NULL;
FILE *from = fopen(src, "r");
if (from == NULL) {
ret = errno == ENOENT ? KNOT_EFILE : knot_map_errno();
goto done;
}
buf = malloc(sizeof(*buf) * BUFSIZE);
if (buf == NULL) {
ret = KNOT_ENOMEM;
goto done;
}
ret = open_tmp_file(dest, &tmp_name, &file, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP);
if (ret != KNOT_EOK) {
goto done;
}
ssize_t cnt;
while ((cnt = fread(buf, sizeof(*buf), BUFSIZE, from)) != 0 &&
(ret = (fwrite(buf, sizeof(*buf), cnt, file) == cnt))) {
}
ret = !ret || ferror(from);
if (ret != 0) {
ret = knot_map_errno();
unlink(tmp_name);
goto done;
}
ret = rename(tmp_name, dest);
if (ret != 0) {
ret = knot_map_errno();
unlink(tmp_name);
goto done;
}
ret = KNOT_EOK;
done:
free(tmp_name);
if (file != NULL) {
fclose(file);
}
free(buf);
if (from != NULL) {
fclose(from);
}
return ret;
}
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