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#include <stdio.h>
#include <stdlib.h>
#include <sched.h>
#include <signal.h>
#include <assert.h>
#include "jail.h"
#include "log.h"
static int jail_daemonfn(jail_ctx *ctx);
static int jail_childfn(void *arg);
void jail_init(jail_ctx **ctx, size_t stacksize)
{
assert(ctx);
if (stacksize > BUFSIZ)
stacksize = BUFSIZ;
if (!*ctx)
*ctx = calloc(1, sizeof(**ctx));
assert(*ctx);
(*ctx)->stacksize = stacksize;
(*ctx)->stack_ptr = calloc(1, (*ctx)->stacksize);
(*ctx)->stack_beg =
(unsigned char *) (*ctx)->stack_ptr
+ (*ctx)->stacksize;
}
void jail_free(jail_ctx **ctx)
{
free((*ctx)->stack_ptr);
free(*ctx);
*ctx = NULL;
}
int jail_daemonize(jail_ctx *ctx)
{
assert(ctx);
ctx->jail_pid = fork();
switch (ctx->jail_pid) {
case -1:
W_STRERR("Jail daemonize");
return 1;
case 0:
N("%s", "Jail daemon mainloop");
jail_daemonfn(ctx);
break;
}
D2("Jail daemon pid: %d", ctx->jail_pid);
return 0;
}
static int jail_daemonfn(jail_ctx *ctx)
{
int clone_flags = CLONE_NEWUTS|CLONE_NEWPID|CLONE_NEWIPC|
CLONE_NEWNS|CLONE_NEWNET;
assert(ctx);
while (1) {
ctx->jail_pid = clone(jail_childfn, ctx->stack_beg,
SIGCHLD|clone_flags, ctx);
sleep(1);
printf("---\n");
}
exit(EXIT_SUCCESS);
}
static int jail_childfn(void *arg)
{
printf("----> CHILD FN <----\n");
FILE *log = fopen("./test.log", "wb");
fprintf(log, "---> CHILD FN <----\n");
sleep(200);
return 0;
}
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