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/* $OpenBSD: check_script.c,v 1.21 2017/05/28 10:39:15 benno Exp $ */
/*
* Copyright (c) 2007 - 2014 Reyk Floeter <reyk@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/wait.h>
#include <sys/time.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <signal.h>
#include <pwd.h>
#include "relayd.h"
void script_sig_alarm(int);
pid_t child = -1;
void
check_script(struct relayd *env, struct host *host)
{
struct ctl_script scr;
struct table *table;
if ((table = table_find(env, host->conf.tableid)) == NULL)
fatalx("%s: invalid table id", __func__);
host->last_up = host->up;
host->flags &= ~(F_CHECK_SENT|F_CHECK_DONE);
scr.host = host->conf.id;
if ((strlcpy(scr.name, host->conf.name,sizeof(scr.name)) >=
sizeof(scr.name)) ||
(strlcpy(scr.path, table->conf.path, sizeof(scr.path)) >=
sizeof(scr.path)))
fatalx("invalid script path");
memcpy(&scr.timeout, &table->conf.timeout, sizeof(scr.timeout));
proc_compose(env->sc_ps, PROC_PARENT, IMSG_SCRIPT, &scr, sizeof(scr));
}
void
script_done(struct relayd *env, struct ctl_script *scr)
{
struct host *host;
if ((host = host_find(env, scr->host)) == NULL)
fatalx("%s: invalid host id", __func__);
if (scr->retval < 0)
host->up = HOST_UNKNOWN;
else if (scr->retval == 0)
host->up = HOST_DOWN;
else
host->up = HOST_UP;
host->flags |= F_CHECK_DONE;
hce_notify_done(host, host->up == HOST_UP ?
HCE_SCRIPT_OK : HCE_SCRIPT_FAIL);
}
void
script_sig_alarm(int sig)
{
int save_errno = errno;
if (child != -1)
kill(child, SIGKILL);
errno = save_errno;
}
int
script_exec(struct relayd *env, struct ctl_script *scr)
{
int status = 0, ret = 0;
sig_t save_quit, save_int, save_chld;
struct itimerval it;
struct timeval *tv;
const char *file, *arg;
struct passwd *pw;
if ((env->sc_conf.flags & F_SCRIPT) == 0) {
log_warnx("%s: script disabled", __func__);
return (-1);
}
DPRINTF("%s: running script %s, host %s",
__func__, scr->path, scr->name);
arg = scr->name;
file = scr->path;
tv = &scr->timeout;
save_quit = signal(SIGQUIT, SIG_IGN);
save_int = signal(SIGINT, SIG_IGN);
save_chld = signal(SIGCHLD, SIG_DFL);
switch (child = fork()) {
case -1:
ret = -1;
goto done;
case 0:
signal(SIGQUIT, SIG_DFL);
signal(SIGINT, SIG_DFL);
signal(SIGCHLD, SIG_DFL);
if ((pw = getpwnam(RELAYD_USER)) == NULL)
fatal("%s: getpwnam", __func__);
if (chdir("/") == -1)
fatal("%s: chdir(\"/\")", __func__);
if (setgroups(1, &pw->pw_gid) ||
setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) ||
setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid))
fatal("%s: can't drop privileges", __func__);
/*
* close fds before executing an external program, to
* prevent access to internal fds, eg. IMSG connections
* of internal processes.
*/
closefrom(STDERR_FILENO + 1);
execlp(file, file, arg, (char *)NULL);
_exit(0);
break;
default:
/* Kill the process after a timeout */
signal(SIGALRM, script_sig_alarm);
bzero(&it, sizeof(it));
bcopy(tv, &it.it_value, sizeof(it.it_value));
setitimer(ITIMER_REAL, &it, NULL);
waitpid(child, &status, 0);
break;
}
switch (ret) {
case -1:
ret = -1;
break;
default:
if (WIFEXITED(status))
ret = WEXITSTATUS(status);
else
ret = 0;
}
done:
/* Disable the process timeout timer */
bzero(&it, sizeof(it));
setitimer(ITIMER_REAL, &it, NULL);
child = -1;
signal(SIGQUIT, save_quit);
signal(SIGINT, save_int);
signal(SIGCHLD, save_chld);
signal(SIGALRM, SIG_DFL);
return (ret);
}
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