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/*
* Copyright (c) 2016 Samsung Electronics Co., Ltd.
*
* 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 <dlfcn.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sched.h>
#include <sys/mount.h>
#include <tzplatform_config.h>
// For compatibility, Using hard-coded path
#define LEGACY_CONTENTS_DIR "/opt/usr/media"
#define LEGACY_APPS_DIR "/opt/usr/apps"
#define LAZYMOUNT_LIB "/usr/lib/liblazymount.so.0"
#define CONTAINER_LIB "/usr/lib/security/pam_krate.so"
#define LOAD_SYMBOL(handle, sym, name) \
do{ \
sym = dlsym(handle, name); \
if (!sym) { \
fprintf(stderr, "dlsym %s error\n", name); \
dlclose(handle); \
return -1; \
} \
} while (0);
static void *container_handle = NULL;
static int normal_user_preprocess(char *username)
{
int r;
r = unshare(CLONE_NEWNS);
if (r < 0) {
fprintf(stderr,"unshare failed\n");
return r;
}
r = mount(NULL, "/", NULL, MS_SLAVE | MS_REC, NULL);
if (r < 0) {
fprintf(stderr,"Failed to change the propagation type of root to SLAVE\n");
return r;
}
return 0;
}
static int normal_user_postprocess(char *username)
{
int r;
r = mount(tzplatform_getenv(TZ_USER_CONTENT),
LEGACY_CONTENTS_DIR, NULL, MS_BIND, NULL);
if (r < 0) {
fprintf(stderr, "user content bind mount failed - %d\n",errno);
return r;
}
r = mount(tzplatform_getenv(TZ_USER_APP),
LEGACY_APPS_DIR, NULL, MS_BIND, NULL);
if (r < 0) {
fprintf(stderr, "user app bind mount failed - %d\n",errno);
return r;
}
return 0;
}
static int container_open(void)
{
if (container_handle)
return 0;
container_handle = dlopen(CONTAINER_LIB, RTLD_LAZY);
if (!container_handle) {
fprintf(stderr, "container module dlopen error\n");
return -1;
}
return 0;
}
static int container_preprocess(char *username)
{
int r;
int (*handle_preprocess)(char *);
r = container_open();
if (r < 0)
return r;
LOAD_SYMBOL(container_handle, handle_preprocess, "container_preprocess");
r = handle_preprocess(username);
if (r < 0) {
fprintf(stderr, "container module preprocess error\n");
return r;
}
return 0;
}
static int container_postprocess(char *username)
{
int r;
int (*handle_postprocess)(char *);
r = container_open();
if (r < 0)
return r;
LOAD_SYMBOL(container_handle, handle_postprocess, "container_postprocess");
r = handle_postprocess(username);
if (r < 0) {
fprintf(stderr, "container module postprocess error\n");
return r;
}
return 0;
}
static int wait_condition(void)
{
int r;
void *h;
int (*wait_mount_user)(void);
r = access(LAZYMOUNT_LIB,F_OK);
if (r < 0){
fprintf(stderr, "cannot find lazymount module - No support lazymount\n");
return 0;
}
h = dlopen(LAZYMOUNT_LIB, RTLD_LAZY);
if (!h) {
fprintf(stderr, "lazymount module dlopen error\n");
return -1;
}
LOAD_SYMBOL(h, wait_mount_user, "wait_mount_user");
r = wait_mount_user();
if (r < 0) {
fprintf(stderr, "wait_mout_user failed\n");
dlclose(h);
return r;
}
dlclose(h);
return 0;
}
int main(int argc, char *argv[])
{
int r = 0;
int support_container = 0;
if (argc < 2) {
fprintf(stderr, "require user argument\n");
return -1;
}
/* pre-processing */
r = normal_user_preprocess(argv[1]);
if (r < 0) {
fprintf(stderr, "normal user preprocess failed\n");
return r;
}
/* If container supports below funcs, below line should be enabled. */
support_container = (access(CONTAINER_LIB, F_OK) == 0) ? 1 : 0;
if (support_container) {
r = container_preprocess(argv[1]);
if (r < 0) {
fprintf(stderr, "container preprocess failed\n");
return r;
}
}
/* TODO: fork & exec */
r = system("/usr/lib/systemd/systemd --user &");
if (r < 0) {
fprintf(stderr, "systemd user execution failed\n");
return r;
}
/* sync-style since there is no need to process other signal */
wait_condition();
/* post-processing */
r = normal_user_postprocess(argv[1]);
if (r < 0) {
fprintf(stderr, "normal user postprocess failed\n");
return r;
}
if (support_container) {
r = container_postprocess(argv[1]);
if (r < 0) {
fprintf(stderr, "container postprocess failed\n");
return r;
}
}
return 0;
}
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