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Date: Wed, 21 Jul 1999 11:21:19 +0200
From: Sheldon Hearn <sheldonh@uunet.co.za>
Reply-To: Sheldon Hearn <sheldonh@uunet.co.za>
To: FreeBSD-gnats-submit@freebsd.org
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Subject: bin/12731: inetd SIGHUP breaks SIGCHLD handling
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>Number:         12731
>Category:       bin
>Synopsis:       inetd SIGHUP breaks SIGCHLD handling
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Jul 21 02:30:01 PDT 1999
>Closed-Date:
>Last-Modified:
>Originator:     Sheldon Hearn
>Release:        FreeBSD 4.0-CURRENT i386
>Organization:
UUNET South Africa
>Environment:

	FreeBSD 4.0-CURRENT w/ rev 1.59 of inetd.c

>Description:

	When a wrapping inetd adds a new service during a SIGHUP-induced
	config(), and when the rule pertaining to that service in
	/etc/hosts.allow uses the hosts_options(3) spawn option, inetd
	is unable to run the associated daemon for that service.

>How-To-Repeat:

	In /etc/inetd.conf:
	# telnet service commented out:
	#telnet  stream  tcp  nowait  root  /usr/libexec/telnetd  telnet

	In /etc/hosts.allow:
	telnetd: ALL : \
	    spawn (/bin/echo "Something or other") & \
	    : ALLOW

	Make sure no inetd daemon is running and do:
	# inetd -w
	# telnet localhost
	Trying 127.0.0.1...
	telnet: Unable to connect to remote host: Connection refused

	Now, change /etc/inetd.conf:
	# bind to telnet port:
	telnet  stream  tcp  nowait  root  /usr/libexec/telnetd  telnet

	Do:
	# kill -HUP `cat /var/run/inetd.pid`
	# telnet localhost
	Trying 127.0.0.1...
	Connected to localhost.
	Escape character is '^]'.
	Connection closed by foreign host.
	
	Notice in /var/log/messages:
	Jul 21 11:11:04 axl inetd[18062]: write: Bad file descriptor

>Fix:

	Not known at this time.

	Although the failure that causes the syslog message happens in
	flag_signal() at line 769 of inetd.c, I'm not sure why the
	pipe(2) call fails. Obviously, main() and config() are the two
	suspects to look at. ;-)

	I'll look at it when I have a moment, unless David Malone and
	the boys beat me to it. ;-)


>Release-Note:
>Audit-Trail:
>Unformatted:


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