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#include <sys/types.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <sys/sysctl.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <paths.h>
#include <signal.h>
#include <stdio.h>
#include <syslog.h>
#include <err.h>
#include <errno.h>
#include <stdarg.h>
#include <unistd.h>
#include <kvm.h>
#include <limits.h>
#include <fcntl.h>
#include "util.h"
#ifdef HAVE_CONFIG_H
#include "../config.h"
#endif
/* The timeout to wait between kills */
#define DEFAULT_TIMEOUT 3
int g_timeout = DEFAULT_TIMEOUT;
/* Supress warnings */
int g_quiet = 0;
int main(int argc, char* argv[])
{
int ch, r, jid;
int ret = 0;
int restart = 0;
int force = 0;
pid_t child;
while((ch = getopt(argc, argv, "fhqrt:")) != -1)
{
switch(ch)
{
case 'f':
force = 1;
break;
case 'q':
g_quiet = 1;
break;
case 'h':
/* dummy for compatibility with killjail */
warnx("the '-h' option has been depreciated");
break;
case 'r':
restart = 1;
break;
/* Timeout to use between kills */
case 't':
g_timeout = atoi(optarg);
if(g_timeout <= 0)
errx(2, "invalid timeout argument: %s", optarg);
break;
case '?':
default:
usage();
}
}
argc -= optind;
argv += optind;
/* Make sure we have a jail id or name */
if(argc == 0)
usage();
/* For each jail */
while(argc > 0)
{
jid = translate_jail(argv[0]);
if(jid == -1)
{
warnx(1, "unknown jail host name: %s", argv[0]);
ret = 1;
continue;
}
/*
* We fork and the child goes into the jail and
* does the dirty work.
*/
switch((child = fork()))
{
/* Error condition */
case -1:
err(1, "couldn't fork child process");
break;
/* The child */
case 0:
if(jail_attach(jid) == -1)
err(1, "couldn't attach to jail");
r = kill_jail(restart, force, argv[0]);
exit(r);
break;
/* The parent */
default:
if(waitpid(child, &r, options) == -1)
err(1, "error waiting for child process");
if(r != 0)
ret = r;
break;
};
argc--;
argv++;
}
return ret;
}
int kill_jail(int restart, int force, const char* name)
{
kvm_t* kd = NULL;
char errbuf[_POSIX2_LINE_MAX];
int pass = 0;
int timeout = 0;
int ret = 0;
/* Open the kernel interface */
kd = kvm_openfiles(_PATH_DEVNULL, _PATH_DEVNULL, _PATH_DEVNULL,
O_RDONLY, errbuf);
if(kd == NULL)
errx(1, "couldn't connect to kernel: %s", errbuf);
/*
* Multiple passes are used to do different things.
* Each time the jails processes are listed.
*/
while(true)
{
while(timeout > 0)
{
sleep(1);
timeout--;
if(!check_running_processes(kd))
goto done;
}
switch(pass)
{
/* First pass is an orderly shutdown */
case 0:
/* Check if we have an executable shutdown script */
if(check_jail_command(name, "/etc/rc.shutdown"))
run_jail_command(name, "/etc/rc.shutdown", NULL, JAIL_OUT_CONSOLE);
break;
/* Okay now quit all processes in jail */
case 1:
kill_jail_processes(kd, SIGTERM);
timeout = g_timeout;
break;
/* Okay now we force kill the processes if necessary */
case 2:
if(force)
{
/* If we get here, jailer looks like it's really irresponsive */
if(!g_quiet)
warnx("%s: jail won't stop. forcing jail termination...", name);
kill_jail_processes(kd, SIGKILL);
timeout = g_timeout;
}
break;
case 3:
if(check_running_processes(kd))
{
/* And if that didn't do it, well then give up */
if(!g_quiet)
warnx("%s: couldn't stop jail, processes wouldn't die", name);
ret = 1;
goto done;
}
else if(restart)
{
/* Check if we have an executable shutdown script */
if(check_jail_command(name, "/etc/rc"))
run_jail_command(name, "/etc/rc", NULL, JAIL_OUT_CONSOLE);
goto done;
}
}
pass++;
if(!check_running_processes(kd))
goto done;
}
done:
if(kd != NULL)
kvm_close(kd);
return ret;
}
void kill_jail_processes(kvm_t* kd, int sig)
{
struct kinfo_proc* kp;
int nentries, i;
pid_t cur;
cur = getpid();
/* Get a process listing */
if((kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, &nentries)) == 0)
errx(1, "couldn't list processes: %s", kvm_geterr(kd));
/* Okay now loop and look at each process' jail */
for(i = 0; i < nentries; i++)
{
if(kp[i].ki_pid == cur)
continue;
if(kill(kp[i].ki_pid, sig) == -1)
{
if(errno != ESRCH)
errx(1, "couldn't signal process: %d", (int)kp[i].ki_pid);
}
}
}
int check_running_processes(kvm_t* kd)
{
struct kinfo_proc* kp;
int nentries, i;
pid_t cur;
cur = getpid();
/* Get a process listing */
if((kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, &nentries)) == 0)
errx(1, "couldn't list processes: %s", kvm_geterr(kd));
if(&nentries != 1)
return 1;
/* Okay now loop and look at each process' jail */
for(i = 0; i < nentries; i++)
{
if(kp[i].ki_pid != cur)
return 1;
}
return 0;
}
static void usage()
{
fprintf(stderr, "usage: killjail [ -r ] [ -t timeout ] [ -qf ] jailname ...\n");
exit(2);
}
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