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#include <sys/types.h>
#include <sys/param.h>
#include <sys/jail.h>
#include <sys/sysctl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <kvm.h>
#include <paths.h>
#include <errno.h>
#include "util.h"
#ifdef HAVE_CONFIG_H
#include "../config.h"
#endif
static void usage();
static void list_jails();
int main(int argc, char* argv[])
{
if(argc > 1)
usage();
if(running_in_jail())
errx(1, "can't run from inside jail");
list_jails();
return 0;
}
static void usage()
{
fprintf(stderr, "usage: jails \n");
exit(2);
}
static void list_jails()
{
struct xprison* sxp;
struct xprison* xp;
size_t len, i;
/* ... otherwise it's a name */
if(sysctlbyname("security.jail.list", NULL, &len, NULL, 0) == -1)
err(1, "couldn't list jails");
retry:
if(len <= 0)
return;
sxp = xp = calloc(len, 1);
if(sxp == NULL)
err(1, "out of memory");
if(sysctlbyname("security.jail.list", xp, &len, NULL, 0) == -1)
{
if(errno == ENOMEM)
{
free(sxp);
goto retry;
}
err(1, "couldn't list jails");
}
if(len < sizeof(*xp) || len % sizeof(*xp) || xp->pr_version != XPRISON_VERSION)
errx(1, "kernel and userland out of sync");
for(i = 0; i < (len / sizeof(*xp)); i++)
printf("%s\n", xp[i].pr_host);
free(sxp);
}
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