https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205144
Bug ID: 205144
Summary: [patch] make rsh(1) compatible with recent Cisco IOS
versions
Product: Base System
Version: 10.2-STABLE
Hardware: Any
OS: Any
Status: New
Keywords: patch
Severity: Affects Some People
Priority: ---
Component: bin
Assignee: [email protected]
Reporter: [email protected]
Keywords: patch
Created attachment 163996
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=163996&action=edit
rsh.diff
It's not uncommon to run periodic jobs that use rsh(1) to connect to Cisco IOS
devices (routers, switches) to manage them or collect some information not
available via SNMP using "show ..." commands.
Our rsh(1) implementation does "shutdown(rem, SHUT_WR)" when it detects
"end-of-file" condition for standard input stream to inform remote host of EOF.
Jobs created with cron(8) have standard input redirected from /dev/null and
rsh(1) calls mentioned shutdown() just after connection is created.
Recent Cisco IOS versions (e.g. 15.x) close remote shell session immediately on
receiving such end-of-stream indication that results in empty output of "show
..." commands.
Attached patch introduces new "rsh -N" option that acts like opposite to
"rsh -n" mode preventing shutdown of socket sending path. This prevents of
premature disconnect of rsh session by remote host.
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