Reading a router configuration file Post: 302749483

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Top Forums Programming Reading a router configuration file Post 302749483 by DGPickett on Friday 28th of December 2012 12:06:50 PM

12-28-2012

Registered User

Well, pointers should be file relative, but if crudely done, there may be an arbitrary offset you need to use. They might even be negative relative to end of file. You need two spaces in the file, a linked list space and a heap of pointed to objects, but they can be intermingled:link1, char[]-1a, char[]-1b, link2, . . . . Dump reading will tell you where the strings are, if that is the nature of what their 'char' pointers point to. Remember that early compilers had no void*, so char* was it, the finest grained pointer. Perhaps if you can separate the strings and the links, you can figure out how to apply link and string pointers to the file image.

Then there is the issue of whether they are null terminated, context-known-length or a size for each is stored somewhere, like at pointer-n. More dump reading.

Last edited by DGPickett; 12-28-2012 at 01:13 PM..

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defaultrouter

defaultrouter(4)						   File Formats 						  defaultrouter(4)

NAME

       defaultrouter - configuration file for default router(s)

SYNOPSIS

       /etc/defaultrouter

DESCRIPTION

       The /etc/defaultrouter file specifies a IPv4 host's default router(s).

       The format of the file is as follows:

       IP_address
       ...

       The  /etc/defaultrouter	file can contain the IP addresses or hostnames of one or more default routers, with each entry on its own line. If
       you use hostnames, each hostname must also be listed in the local /etc/hosts file, because no name services are running at  the	time  that
       defaultrouter is read.

       Lines beginning with the ``#'' character are treated as comments.

       The  default  routes  listed  in this file replace those added by the kernel during diskless booting. An empty /etc/defaultrouter file will
       cause the default route added by the kernel to be deleted.

       Use of a default route, whether received from a DHCP server or from /etc/defaultrouter, prevents a machine from acting as an  IPv4  router.
       You can use routeadm(1M) to override this behavior.

FILES

       /etc/defaultrouter	       Configuration file containing the hostnames or IP addresses of one or more default routers.

SEE ALSO

       in.rdisc(1M), in.routed(1M), routeadm(1M), hosts(4)

SunOS 5.10							    17 Aug 2004 						  defaultrouter(4)