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unicorn.c
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unicorn.c
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#define _GNU_SOURCE
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <sched.h>
#include <signal.h>
#include <unistd.h>
#include <sys/wait.h>
#include <assert.h>
#include <stdlib.h>
#include <getopt.h>
#include <string.h>
#include "util.h"
#include "cgroup.h"
#include "mount.h"
#include "net.h"
#define STACK_SIZE (1024 * 1024)
static char child_stack[STACK_SIZE];
char* const child_args[] = {
"/bin/bash",
NULL
};
char * const rootfs_base="/tmp/rootfs_base";
char * const mount_base="/tmp/unicorn";
char * const pivot_old=".pivot_old";
int pipes[2];
int child_main(void* arg)
{
net_t * n = (net_t *)arg;
//printf("in child main\n");
char c;
close(pipes[1]);
printf(" child pid from cloned child process:: [%5d] unicorn_id:: [%s] \n", getpid(), n->unicorn_id);
pivot_move(mount_base, n->unicorn_id);
//wait for the net peer to be setup
read(pipes[0],&c,1);
sethostname(n->hostname, 20);
net_conf(n);
check_result(execv(child_args[0], child_args), "execv");
printf("return from chinld_main \n");
return 1;
}
void print_usage(char * cmd) {
printf("Usage: %s \n", cmd);
printf("[--ip] ip : set the container ip \n");
printf("[--mask] mask : set the conatiner maek \n");
printf("[--gateway] gateway: set the container gateway \n");
}
int main(int argc, char * argv[])
{
char * ip = NULL;
char * mask = NULL;
char * gw = NULL;
int c;
while (1)
{
static struct option long_options[] =
{
{"help", no_argument, 0, 'h'},
{"ip", required_argument, 0, 'i'},
{"mask", required_argument, 0, 'm'},
{"gateway", required_argument, 0, 'g'},
};
int option_index = 0;
c = getopt_long(argc, argv, "hi:m:g:",
long_options, &option_index);
/* Detect the end of the options. */
if (c == -1)
break;
switch (c)
{
case 'h':
print_usage(argv[0]);
exit(EXIT_FAILURE);
case 'i':
ip = malloc(strlen(optarg));
strncpy(ip, optarg, strlen(optarg));
break;
case 'm':
mask = malloc(strlen(optarg));
strncpy(mask, optarg, strlen(optarg));
break;
case 'g':
gw = malloc(strlen(optarg));
strncpy(gw, optarg, strlen(optarg));
break;
case '?':
break;
default:
print_usage(argv[0]);
exit(EXIT_FAILURE);
}
}
if (ip == NULL || mask == NULL || gw == NULL) {
print_usage(argv[0]);
exit(EXIT_FAILURE);
}
printf("ip is %s, mask is %s, gateway is %s \n", ip, mask, gw);
mount_init(mount_base);
pipe(pipes);
printf(" parent pid:: [%5d] \n",getpid());
//unicorn id for the container
char * unicorn_id = malloc(11);
random_string(unicorn_id, 10);
//net configuration
net_t *n = calloc(1, sizeof(net_t));;
assert(n != NULL);
n->unicorn_id = unicorn_id;
char * hostname = malloc(20);
sprintf(hostname,"unicorn-%s",unicorn_id);
n->hostname = hostname;
n->mtu=1500;
n->ip=ip;
n->netmask=mask;
n->gateway=gw;
//prepare auts and then clone
prepare_mount(mount_base, unicorn_id, rootfs_base);
int child_pid = clone(child_main, child_stack+STACK_SIZE, CLONE_NEWIPC | CLONE_NEWUTS | CLONE_NEWPID | CLONE_NEWNS | CLONE_NEWNET | SIGCHLD, n);
//prepare unicorn info
unicorn_t *u = calloc(1, sizeof(unicorn_t));;
assert(u != NULL);
u->child_pid = child_pid;
u->parent_pid = getpid();
u->unicorn_id = unicorn_id;
//cgroup
cgroup_add(u);
//net
net_add(u);
printf(" child pid from parent:: [%5d] \n",child_pid);
sleep(1);
//call child to prepare the inner ethenet
close(pipes[1]);
//wait to die
waitpid(child_pid, NULL, 0);
return 0;
}