Date: Tue, 22 Aug 1995 22:53:16 +0200 From: kieber@sax.sax.de To: FreeBSD-gnats-submit@freebsd.org Subject: bin/706: .rhosts weirdness Message-ID: <199508222053.WAA09966@sax.sax.de> Resent-Message-ID: <199508222100.OAA17171@freefall.FreeBSD.org>
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>Number: 706 >Category: bin >Synopsis: increased root DNS traffic and long latencies for r-commands >Confidential: no >Severity: serious >Priority: high >Responsible: freebsd-bugs >State: open >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Tue Aug 22 14:00:02 PDT 1995 >Last-Modified: >Originator: Ulf Kieber >Organization: SaxNet e. V. >Release: FreeBSD 2.0-BUILT-19950603 i386 >Environment: FreeBSD sax.sax.de 2.0.5-RELEASE FreeBSD 2.0.5-RELEASE #1: Mon Aug 14 21:18:11 MET DST 1995 root@sax.sax.de:/usr/src/sys/compile/SAX i386 >Description: If I'm trying to rsh from a host, that's located almost at the end of my .rhosts to the machine named in >Environment it takes an eternity to complete. Following is a snippet of my .rhosts (which in reality is much longer): irz101 uk1 irz101.inf.tu-dresden.de uk1 141.76.2.1 uk1 irz102 uk1 irz102.inf.tu-dresden.de uk1 141.76.2.2 uk1 irz103 uk1 irz103.inf.tu-dresden.de uk1 141.76.2.3 uk1 tcpdump on the FreeBSD machine gives me: sax.sax.de /root# tcpdump -i ed0 -nt ip src host 193.175.26.33 and ip dst host 141.76.1.9 and dst port 53 tcpdump: listening on ed0 ... 193.175.26.33.1568 > 141.76.1.9.53: 49+ (42) 193.175.26.33.1569 > 141.76.1.9.53: 50+ (31) 193.175.26.33.1570 > 141.76.1.9.53: 51+ A? irz101. (24) 193.175.26.33.1572 > 141.76.1.9.53: 52+ (42) 193.175.26.33.1574 > 141.76.1.9.53: 53+ (31) 193.175.26.33.1576 > 141.76.1.9.53: 54+ A? irz102. (24) 193.175.26.33.1578 > 141.76.1.9.53: 55+ (42) 193.175.26.33.1580 > 141.76.1.9.53: 56+ (31) 193.175.26.33.1581 > 141.76.1.9.53: 57+ A? irz103. (24) 193.175.26.33.1582 > 141.76.1.9.53: 58+ (42) 193.175.26.33.1583 > 141.76.1.9.53: 59+ (31) ... The entries for the unqualified hostnames irz101 uk1 irz102 uk1 irz103 uk1 obviously get tries as _root_ level domains, which tremendously increases the DNS traffic to the root name servers. >How-To-Repeat: Create a long .rhosts which many unqualified hostnames in it on a FreeBSD 2.0.5R machine and try rsh-ing to it from a host located neer the end of the .rhosts. >Fix: Not yet. Gotta walk throu the code. >Audit-Trail: >Unformatted:
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