Date: Mon, 18 May 1998 17:23:33 +0300 From: Ruslan Ermilov <ru@ucb.crimea.ua> To: questions@FreeBSD.ORG Subject: Inetd: bug or expected behaviour Message-ID: <19980518172333.A14723@ucb.crimea.ua>
next in thread | raw e-mail | index | archive | help
Hi! Currently I'm running FreeBSD 2.2.6-STABLE (last world at May, 13). Is the following a bug or expected behaviour? The Problem: =========== Recently I've switched from bootp to isc-dhcp2. They both listen on udp port 67, and I had the standard entry for bootpd in my inetd.conf: bootps dgram udp wait root /usr/libexec/bootpd bootpd When I've finished with DHCP configuration file (dhcpd.conf), I (as usually) commented out the string for ``bootpd'' above in inetd.conf, killed -HUP inetd, and tried to run dhcpd. I was unable to run it with the following diagnostic: ``Unable to bind, address already in use''. There was no bootpd process, and even when I killed inetd itself, the dhcpd was unable to bind to the 67 port. How-To-Repeat: ============= 1. Create a simple program which just does nothing (I called it test.sh) and put in in /tmp: #!/bin/sh while :; do sleep 1000; done 2. Add an entry for bootps in inetd.conf: bootps dgram udp wait root /tmp/test.sh test.sh (Substitute for ``bootps'' any UDP service you wish). 3. Restart inetd by killing -HUP it. 4. Send something to this port. I used the netcat (from the ports/net) for this purpose: echo xxxxxxxxxxxxxxx | nc -u localhost bootps 5. ``netstat -an -finet'' will show the string similar to this one: udp 618 0 0 *.68 *.* (Receive queue size is 618 bytes). 6. Comment the line for bootpd in /etc/inetd.conf, restart inetd. 7. Kill the test.sh process. 8. Try to bind to the port again. You'll get the ``Address already in use'' error; ``netstat -an'' still shows the line as above (step 5). Workaround: ========== Wait some time (what exact?) until the kernel purges the receive queue. Thanks in advance, -- Ruslan Ermilov System Administrator ru@ucb.crimea.ua United Commercial Bank +380-652-247647 Simferopol, Crimea 2426679 ICQ Network, UIN To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?19980518172333.A14723>