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On startup, check to see if sshd is already daemonized
and if so, skip the call to daemon() and do not rewrite the PidFile.  This
means that when sshd re-execs itself on SIGHUP the process ID will no longer
change.  Should address bz#2641.  ok djm@ markus@.

Upstream-ID: 5ea0355580056fb3b25c1fd6364307d9638a37b9
This commit is contained in:
dtucker@openbsd.org 2016-11-30 00:28:31 +00:00 committed by Damien Miller
parent c9f880c195
commit 7fc4766ac7
3 changed files with 29 additions and 9 deletions
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20
misc.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: misc.c,v 1.106 2016/10/23 22:04:05 dtucker Exp $ */
/* $OpenBSD: misc.c,v 1.107 2016/11/30 00:28:31 dtucker Exp $ */
/*
* Copyright (c) 2000 Markus Friedl. All rights reserved.
* Copyright (c) 2005,2006 Damien Miller. All rights reserved.
@ -1251,3 +1251,21 @@ bind_permitted(int port, uid_t uid)
return 0;
return 1;
}
/* returns 1 if process is already daemonized, 0 otherwise */
int
daemonized(void)
{
int fd;
if ((fd = open(_PATH_TTY, O_RDONLY | O_NOCTTY)) >= 0) {
close(fd);
return 0; /* have controlling terminal */
}
if (getppid() != 1)
return 0; /* parent is not init */
if (getsid(0) != getpid())
return 0; /* not session leader */
debug3("already daemonized");
return 1;
}

3
misc.h
View File

@ -1,4 +1,4 @@
/* $OpenBSD: misc.h,v 1.60 2016/10/23 22:04:05 dtucker Exp $ */
/* $OpenBSD: misc.h,v 1.61 2016/11/30 00:28:31 dtucker Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
@ -31,6 +31,7 @@ struct Forward {
int forward_equals(const struct Forward *, const struct Forward *);
int bind_permitted(int, uid_t);
int daemonized(void);
/* Common server and client forwarding options. */
struct ForwardOptions {

15
sshd.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: sshd.c,v 1.477 2016/11/29 03:54:50 dtucker Exp $ */
/* $OpenBSD: sshd.c,v 1.478 2016/11/30 00:28:31 dtucker Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@ -1343,7 +1343,7 @@ main(int ac, char **av)
struct ssh *ssh = NULL;
extern char *optarg;
extern int optind;
int r, opt, i, j, on = 1;
int r, opt, i, j, on = 1, already_daemon;
int sock_in = -1, sock_out = -1, newsock = -1;
const char *remote_ip;
int remote_port;
@ -1802,11 +1802,12 @@ main(int ac, char **av)
log_init(__progname, options.log_level, options.log_facility, log_stderr);
/*
* If not in debugging mode, and not started from inetd, disconnect
* from the controlling terminal, and fork. The original process
* exits.
* If not in debugging mode, not started from inetd and not already
* daemonized (eg re-exec via SIGHUP), disconnect from the controlling
* terminal, and fork. The original process exits.
*/
if (!(debug_flag || inetd_flag || no_daemon_flag)) {
already_daemon = daemonized();
if (!(debug_flag || inetd_flag || no_daemon_flag || already_daemon)) {
if (daemon(0, 0) < 0)
fatal("daemon() failed: %.200s", strerror(errno));
@ -1840,7 +1841,7 @@ main(int ac, char **av)
* Write out the pid file after the sigterm handler
* is setup and the listen sockets are bound
*/
if (options.pid_file != NULL && !debug_flag) {
if (options.pid_file != NULL && !debug_flag && !already_daemon) {
FILE *f = fopen(options.pid_file, "w");
if (f == NULL) {