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/*
** Copyright 2008, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#include "installd.h"
int create_pkg_path(char path[PKG_PATH_MAX],
const char *prefix,
const char *pkgname,
const char *postfix)
{
int len;
const char *x;
len = strlen(pkgname);
if (len > PKG_NAME_MAX) {
return -1;
}
if ((len + strlen(prefix) + strlen(postfix)) >= PKG_PATH_MAX) {
return -1;
}
x = pkgname;
int alpha = -1;
while (*x) {
if (isalnum(*x) || (*x == '_')) {
/* alphanumeric or underscore are fine */
} else if (*x == '.') {
if ((x == pkgname) || (x[1] == '.') || (x[1] == 0)) {
/* periods must not be first, last, or doubled */
LOGE("invalid package name '%s'\n", pkgname);
return -1;
}
} else if (*x == '-') {
/* Suffix -X is fine to let versioning of packages.
But whatever follows should be alphanumeric.*/
alpha = 1;
}else {
/* anything not A-Z, a-z, 0-9, _, or . is invalid */
LOGE("invalid package name '%s'\n", pkgname);
return -1;
}
x++;
}
if (alpha == 1) {
// Skip current character
x++;
while (*x) {
if (!isalnum(*x)) {
LOGE("invalid package name '%s' should include only numbers after -\n", pkgname);
return -1;
}
x++;
}
}
sprintf(path, "%s%s%s", prefix, pkgname, postfix);
return 0;
}
static int _delete_dir_contents(DIR *d, const char *ignore)
{
int result = 0;
struct dirent *de;
int dfd;
dfd = dirfd(d);
if (dfd < 0) return -1;
while ((de = readdir(d))) {
const char *name = de->d_name;
/* skip the ignore name if provided */
if (ignore && !strcmp(name, ignore)) continue;
if (de->d_type == DT_DIR) {
int r, subfd;
DIR *subdir;
/* always skip "." and ".." */
if (name[0] == '.') {
if (name[1] == 0) continue;
if ((name[1] == '.') && (name[2] == 0)) continue;
}
subfd = openat(dfd, name, O_RDONLY | O_DIRECTORY);
if (subfd < 0) {
LOGE("Couldn't openat %s: %s\n", name, strerror(errno));
result = -1;
continue;
}
subdir = fdopendir(subfd);
if (subdir == NULL) {
LOGE("Couldn't fdopendir %s: %s\n", name, strerror(errno));
close(subfd);
result = -1;
continue;
}
if (_delete_dir_contents(subdir, 0)) {
result = -1;
}
closedir(subdir);
if (unlinkat(dfd, name, AT_REMOVEDIR) < 0) {
LOGE("Couldn't unlinkat %s: %s\n", name, strerror(errno));
result = -1;
}
} else {
if (unlinkat(dfd, name, 0) < 0) {
LOGE("Couldn't unlinkat %s: %s\n", name, strerror(errno));
result = -1;
}
}
}
return result;
}
int delete_dir_contents(const char *pathname,
int also_delete_dir,
const char *ignore)
{
int res = 0;
DIR *d;
d = opendir(pathname);
if (d == NULL) {
LOGE("Couldn't opendir %s: %s\n", pathname, strerror(errno));
return -errno;
}
res = _delete_dir_contents(d, ignore);
closedir(d);
if (also_delete_dir) {
if (rmdir(pathname)) {
LOGE("Couldn't rmdir %s: %s\n", pathname, strerror(errno));
res = -1;
}
}
return res;
}
int delete_dir_contents_fd(int dfd, const char *name)
{
int fd, res;
DIR *d;
fd = openat(dfd, name, O_RDONLY | O_DIRECTORY);
if (fd < 0) {
LOGE("Couldn't openat %s: %s\n", name, strerror(errno));
return -1;
}
d = fdopendir(fd);
if (d == NULL) {
LOGE("Couldn't fdopendir %s: %s\n", name, strerror(errno));
close(fd);
return -1;
}
res = _delete_dir_contents(d, 0);
closedir(d);
return res;
}
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