Reading a router configuration file Post: 302749065

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Top Forums Programming Reading a router configuration file Post 302749065 by DGPickett on Thursday 27th of December 2012 12:22:51 PM

12-27-2012

Registered User

You might just mmap() the file or fread the whole into one malloc'd buffer in one fell swoop, and then much less malloc(). If there 2,4,8 byte integers or any sort of floats in the data, write a subroutine for converting the big or little endian to the native flavor, exploiting the match if you are so lucky (LE on a LE machine).

It might be nice to present it as a simple file of name=value lines, and have a reverse conversion. Of course, the router may be fussy about the order.

Cryptic, well, that could be unicode, utf8, or ebcdic rather than the simple ascii a C programmer usually expects. Do some dump reading and see what it thinks a character string is. I guess they are null terminated or something, as there is no length provided, unless it is hidded just before the string (a common practice -- positive offsets are payload, negatve offsets are the control structure, so the 'char' pointer is to the tail character string of a variable length struct).

DGPickett

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mrinfo

MRINFO(8)						      System Manager's Manual							 MRINFO(8)

NAME

       mrinfo - Displays configuration info from a multicast router

SYNOPSIS

       /usr/sbin/mrinfo [ -d debug_level ] [ -r retry_count ] [ -t timeout_count ] multicast_router

DESCRIPTION

       mrinfo attempts to display the configuration information from the multicast router multicast_router.

       mrinfo  uses  the ASK_NEIGHBORS IGMP message to the specified multicast router. If this multicast router responds, the version number and a
       list of their neighboring multicast router addresses is part of that response. If the responding router has a recent multicast version num-
       ber,  then mrinfo requests additional information such as metrics, thresholds, and flags from the multicast router. Once the specified mul-
       ticast router responds, the configuration is displayed to the standard output.

INVOCATION

       "-d" option sets the debug level. When the debug level is greater than the default value of 0, addition	debugging  messages  are  printed.
       Regardless  of  the debug level, an error condition, will always write an error message and will cause mrinfo to terminate.  Non-zero debug
       levels have the following effects:

       level 1
	      packet warnings are printed to stderr.

       level 2
	      all level 1 messages plus notifications down networks are printed to stderr.

       level 3
	      all level 2 messages plus notifications of all packet timeouts are printed to stderr.

       "-r retry_count" sets the neighbor query retry limit. Default is 3 retry.

       "-t timeout_count" sets the number of seconds to wait for a neighbor query reply. Default timeout is 4 seconds.

SAMPLE OUTPUT

       mrinfo mbone.phony.dom.net
       127.148.176.10 (mbone.phony.dom.net) [version 3.3]:
	127.148.176.10 - 0.0.0.0 (?) [1/1/querier]
	127.148.176.10 - 127.0.8.4 (mbone2.phony.dom.net) [1/45/tunnel]
	127.148.176.10 - 105.1.41.9 (momoney.com) [1/32/tunnel/down]
	127.148.176.10 - 143.192.152.119 (mbone.dipu.edu) [1/32/tunnel]

       For each neighbor of the queried multicast router, the IP of the queried router is displayed, followed by the IP and name of the  neighbor.
       In square brackets the metric (cost of connection), the threshold (multicast ttl) is displayed. If the queried multicast router has a newer
       version number, the type (tunnel, srcrt) and status (disabled, down) of the connection is displayed.

IMPORTANT NOTE

       mrinfo must be run as root.

SEE ALSO

       mrouted(8), map-mbone(8), mtrace(8)

AUTHOR

       Van Jacobson

4.2 Berkeley Distribution														 MRINFO(8)