clrd.cpp

/*Copyright (C) 2019 Zhongmin Wu

License - MIT
=============

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

#include <sys/wait.h>
#include <stdio.h>
#include <unistd.h>
#include <getopt.h>
#include <string.h>

#include "clrd_namespace.h"
#include "clrd_loop.h"
#include "clrd_selinux.h"


//#include <android-base/logging.h>
#ifdef ANDROID
#include <cutils/properties.h>
#define LINUX_PID_PROP  "sys.linux.pid"
#define LINUX_ROOTDIR_PROP  "sys.linux.rootdir"
#endif

#define HELP_STRING "clrd [-b][-p] -l <rootfs.image> -t <mount point>\n"

static void print_usage() {
    printf(HELP_STRING);
}
static int parse_args(int argc, char * argv[], struct child_config *config) {
    int option = 0;
    while ((option = getopt(argc, argv, "bhpl:t:")) != -1 ) {
		switch (option) {
        case 'l':
            asprintf(&config->image_path, "%s", optarg);
            break;
        case 'p': 
            config->new_pid_ns = true;
            break;
        case 'b': 
            config->no_systemd = true;
            break;
        case 't':
            asprintf(&config->target_dir, "%s", optarg);
            break;
        case 'h':
			goto usage;
            break;
		}
	}
    if(!config->image_path) goto usage;
    if(!config->target_dir) goto usage;
    return 0;
usage:
    print_usage();
    return 1;
    
}

int main(int argc, char * argv[]) {
    struct child_config config;

#ifdef ANDROID
    if(!selinux_check_pass()) {
        printf("disable selinux or setenforce 0 and retry\n");
        return -1;
    }
#endif

    memset(&config, 0, sizeof(config));
  
    char * loop_dev = NULL;
    int ret;

    if(parse_args(argc, argv, &config)) {
       // PLOG(ERROR) << HELP_STRING; 
        return -1;
    }

    asprintf(&config.hostname, "%s-%s", "Kuroba", "Aoko");

   
    ret = create_loop_dev(config.image_path, 0, &loop_dev);
    if(ret) {
      //  PLOG(ERROR) << "Create loop dev error";
        printf("Create loop dev error\n");
        return 1;
    }

    config.loop_dev = loop_dev;

    printf("create_new_namespace\n");
    int child_pid = create_new_namespace(&config);
    printf("wait for pid %d\n", child_pid);

#ifdef ANDROID
    char number[20];
    sprintf(number, "%d", child_pid);
    property_set(LINUX_PID_PROP, number);
    property_set(LINUX_ROOTDIR_PROP, config.target_dir);
#endif

    int status;
    waitpid(child_pid, &status, 0);
    printf("waited for pid %d:%d\n", child_pid,status);

#ifdef ANDROID
    property_set(LINUX_PID_PROP, "");
    property_set(LINUX_ROOTDIR_PROP, "");
#endif

    clear_namespace(&config);
    destroy_loop_dev(loop_dev);
    return 0;
}