[rancid] Re: Monitoring BGP in Rancid
john heasley
heas at shrubbery.net
Sun Sep 6 23:48:23 UTC 2009
Sun, Sep 06, 2009 at 04:06:45PM -0400, Jon Lewis:
> On Fri, 4 Sep 2009, mathiruban wrote:
>
> > Dear Team,
> >
> > Is it possible to monitor the BGP status in links using Rancid looking glass?
> > If BGP is down, can I get the email notification?
>
> I don't see why you couldn't add a show ip bg sum to the commands
> run...but the problem I'd see with doing that in rancid is that if you're
> talking about BGP (full routes, peering) with external AS's, the
> number of prefixes received is likely to be in constant flux, causing a
> diff every time rancid runs.
>
> ----------------------------------------------------------------------
> Jon Lewis | I route
> Senior Network Engineer | therefore you are
> Atlantic Net |
> _________ http://www.lewis.org/~jlewis/pgp for PGP public key_________
> _______________________________________________
> Rancid-discuss mailing list
> Rancid-discuss at shrubbery.net
> http://www.shrubbery.net/mailman/listinfo.cgi/rancid-discuss
attached is used for cisco. you'll have to make your own adjustments to
rancid-fe and whatever else within the script.
-------------- next part --------------
#! /usr/bin/perl
##
## $Id: cbgp,v 1.4 2005/05/16 07:14:05 heas Exp $
##
## Copyright (C) 1997-2004 by Terrapin Communications, Inc.
## All rights reserved.
##
## This software may be freely copied, modified and redistributed
## without fee for non-commerical purposes provided that this license
## remains intact and unmodified with any RANCID distribution.
##
## There is no warranty or other guarantee of fitness of this software.
## It is provided solely "as is". The author(s) disclaim(s) all
## responsibility and liability with respect to this software's usage
## or its effect upon hardware, computer systems, other software, or
## anything else.
##
## Except where noted otherwise, rancid was written by and is maintained by
## Henry Kilmer, John Heasley, Andrew Partan, Pete Whiting, and Austin Schutz.
##
#
# RANCID - Really Awesome New Cisco confIg Differ
#
# usage: rancid [-d] [-l] [-f filename | $host]
#
use Getopt::Std;
getopts('dfl');
$log = $opt_l;
$debug = $opt_d;
$file = $opt_f;
$host = $ARGV[0];
$clean_run = 0;
$timeo = 90; # clogin timeout in seconds
my(%filter_pwds); # password filtering mode
# This routine is used to print out the router configuration
sub ProcessHistory {
my($new_hist_tag,$new_command,$command_string, at string)=(@_);
if((($new_hist_tag ne $hist_tag) || ($new_command ne $command))
&& defined %history) {
print eval "$command \%history";
undef %history;
}
if (($new_hist_tag) && ($new_command) && ($command_string)) {
if ($history{$command_string}) {
$history{$command_string} = "$history{$command_string}@string";
} else {
$history{$command_string} = "@string";
}
} elsif (($new_hist_tag) && ($new_command)) {
$history{++$#history} = "@string";
} else {
print "@string";
}
$hist_tag = $new_hist_tag;
$command = $new_command;
1;
}
sub numerically { $a <=> $b; }
# This is a sort routing that will sort numerically on the
# keys of a hash as if it were a normal array.
sub keynsort {
local(%lines)=@_;
local($i) = 0;
local(@sorted_lines);
foreach $key (sort numerically keys(%lines)) {
$sorted_lines[$i] = $lines{$key};
$i++;
}
@sorted_lines;
}
# This is a sort routing that will sort on the
# keys of a hash as if it were a normal array.
sub keysort {
local(%lines)=@_;
local($i) = 0;
local(@sorted_lines);
foreach $key (sort keys(%lines)) {
$sorted_lines[$i] = $lines{$key};
$i++;
}
@sorted_lines;
}
# This is a sort routing that will sort on the
# values of a hash as if it were a normal array.
sub valsort{
local(%lines)=@_;
local($i) = 0;
local(@sorted_lines);
foreach $key (sort values %lines) {
$sorted_lines[$i] = $key;
$i++;
}
@sorted_lines;
}
# This is a numerical sort routing (ascending).
sub numsort {
local(%lines)=@_;
local($i) = 0;
local(@sorted_lines);
foreach $num (sort {$a <=> $b} keys %lines) {
$sorted_lines[$i] = $lines{$num};
$i++;
}
@sorted_lines;
}
# This is a sort routine that will sort on the
# ip address when the ip address is anywhere in
# the strings.
sub ipsort {
local(%lines)=@_;
local($i) = 0;
local(@sorted_lines);
foreach $addr (sort sortbyipaddr keys %lines) {
$sorted_lines[$i] = $lines{$addr};
$i++;
}
@sorted_lines;
}
# These two routines will sort based upon IP addresses
sub ipaddrval {
my(@a) = ($_[0] =~ m#^(\d+)\.(\d+)\.(\d+)\.(\d+)$#);
$a[3]+256*($a[2]+256*($a[1]+256*$a[0]));
}
sub sortbyipaddr {
&ipaddrval($a) <=> &ipaddrval($b);
}
# This routine parses "show ip bgp summary"
sub ShowBgpSum {
my($hdrout) = 0;
print STDERR " In ShowBgpSum: $_" if ($debug);
$hdr = sprintf("%-20s%10s\t%s\n", "Neighbor", "AS", "State");
while (<INPUT>) {
tr/\015//d;
last if(/^$prompt/);
next if(/^(\s*|\s*$cmd\s*)$/);
return(1) if /(Invalid input detected|Type help or )/;
# the pager can not be disabled per-session on the PIX
s/^<-+ More -+>\s*//;
if (/^\s*(\d+\.\d+\.\d+\.\d+)\s*\d\s*(\d+)\s*.*\s+(\d+)$/) {
$ip = $1; $as = $2; $state = "up";
if (! $hdrout) {
$hdrout++;
ProcessHistory("","","","$hdr");
}
$line = sprintf("%-20s%10s\t%s\n", $ip, $as, $state);
ProcessHistory("BGP","ipsort","$1","$line") && next;
}
if (/^\s*(\d+\.\d+\.\d+\.\d+)\s*\d\s*(\d+)\s*.*\s+(\S+)\s*$/) {
$ip = $1; $as = $2; $state = "down";
if (! $hdrout) {
$hdrout++;
ProcessHistory("","","","$hdr");
}
$line = sprintf("%-20s%10s\t%s\n", $ip, $as, $state);
ProcessHistory("BGP","ipsort","$1","$line") && next;
}
}
ProcessHistory("","","","!\n");
return(0);
}
# This routine parses "show ip bgp summary"
sub ShowBgp6Sum {
my($hdrout) = 0;
print STDERR " In ShowBgp6Sum: $_" if ($debug);
$hdr = sprintf("%-40s%10s\t%s\n", "Neighbor", "AS", "State");
while (<INPUT>) {
tr/\015//d;
last if(/^$prompt/);
next if(/^(\s*|\s*$cmd\s*)$/);
return(1) if /(Invalid input detected|Type help or )/;
# the pager can not be disabled per-session on the PIX
s/^<-+ More -+>\s*//;
# v6_ip \n
# ... AS ... (N_prefixes|Connect/etc)
if (/^(\S+(:\S*)+)\s*$/) {
$ip = $1;
if (! $hdrout) {
$hdrout++;
ProcessHistory("","","","$hdr");
}
$_ = <INPUT>;
tr/\015//d;
if (/^\s+\d\s+(\d+)\s+.*\s+(\d+)$/) {
$as = $1; $state = "up";
$line = sprintf("%-40s%10s\t%s\n", $ip, $as, $state);
ProcessHistory("BGP","numsort","$as","$line") && next;
}
/^\s+\d\s+(\d+)\s+.*\s+(\S+)\s*$/;
$as = $1; $state = "down";
$line = sprintf("%-40s%10s\t%s\n", $ip, $as, $state);
ProcessHistory("BGP","numsort","$as","$line");
next;
}
# v6_ip ... AS ... N_prefixes
if (/^(\S+(:\S*)+)\s+\d\s+(\d+)\s+.*\s+(\d+)\s*$/) {
$ip = $1; $as = $3; $state = "up";
if (! $hdrout) {
$hdrout++;
ProcessHistory("","","","$hdr");
}
$line = sprintf("%-40s%10s\t%s\n", $ip, $as, $state);
ProcessHistory("BGP","numsort","$as","$line");
next;
}
# v6_ip ... AS ... Connect/OpenConfirm/etc
if (/^(\S+(:\S?)+)\s+\d\s+(\d+)\s+.*\s+(\S+)\s*$/) {
$ip = $1; $as = $3; $state = "up";
if (! $hdrout) {
$hdrout++;
ProcessHistory("","","","$hdr");
}
$line = sprintf("%-40s%10s\t%s\n", $ip, $as, $state);
ProcessHistory("BGP","numsort","$as","$line");
next;
}
# may be an ipv4 peer addr
# v6_ip ... AS ... N_prefixes
if (/^\s*(\d+\.\d+\.\d+\.\d+)\s*\d\s*(\d+)\s*.*\s+(\d+)$/) {
$ip = $1; $as = $2; $state = "up";
if (! $hdrout) {
$hdrout++;
ProcessHistory("","","","$hdr");
}
$line = sprintf("%-40s%10s\t%s\n", $ip, $as, $state);
ProcessHistory("BGP","numsort","$as","$line") && next;
}
# v4_ip ... AS ... Connect/OpenConfirm/etc
if (/^\s*(\d+\.\d+\.\d+\.\d+)\s*\d\s*(\d+)\s*.*\s+(\S+)$/) {
$ip = $1; $as = $2; $state = "down";
if (! $hdrout) {
$hdrout++;
ProcessHistory("","","","$hdr");
}
$line = sprintf("%-40s%10s\t%s\n", $ip, $as, $state);
ProcessHistory("BGP","numsort","$as","$line") && next;
}
}
return(0);
}
# dummy function
sub DoNothing {print STDOUT;}
# Main
%commands=(
'show ip bgp summary' => "ShowBgpSum",
'show ipv6 bgp summary' => "ShowBgp6Sum",
'show ip bgp ipv6 unicast summary' => "ShowBgp6Sum",
);
# keys() doesnt return things in the order entered and the order of the
# cmds is important (show version first and write term last). pita
@commands=(
"show ip bgp summary",
"show ipv6 bgp summary",
"show ip bgp ipv6 unicast summary"
);
$cisco_cmds=join(";", at commands);
$cmds_regexp=join("|", at commands);
open(OUTPUT,">$host.new") || die "Can't open $host.new for writing: $!\n";
select(OUTPUT);
# make OUTPUT unbuffered if debugging
if ($debug) { $| = 1; }
if ($file) {
print STDERR "opening file $host\n" if ($debug);
print STDOUT "opening file $host\n" if ($log);
open(INPUT,"<$host") || die "open failed for $host: $!\n";
} else {
print STDERR "executing clogin -t $timeo -c\"$cisco_cmds\" $host\n" if ($debug);
print STDOUT "executing clogin -t $timeo -c\"$cisco_cmds\" $host\n" if ($log);
if (defined($ENV{NOPIPE})) {
system "clogin -t $timeo -c \"$cisco_cmds\" $host </dev/null > $host.raw 2>&1" || die "clogin failed for $host: $!\n";
open(INPUT, "< $host.raw") || die "clogin failed for $host: $!\n";
} else {
open(INPUT,"clogin -t $timeo -c \"$cisco_cmds\" $host </dev/null |") || die "clogin failed for $host: $!\n";
}
}
# determine password filtering mode
if ($ENV{"FILTER_PWDS"} =~ /no/i) {
$filter_pwds = 0;
} elsif ($ENV{"FILTER_PWDS"} =~ /all/i) {
$filter_pwds = 2;
} else {
$filter_pwds = 1;
}
ProcessHistory("","","","!RANCID-CONTENT-TYPE: cisco_bgp\n!\n");
#ProcessHistory("COMMENTS","keysort","B0","!\n");
#ProcessHistory("COMMENTS","keysort","D0","!\n");
#ProcessHistory("COMMENTS","keysort","F0","!\n");
#ProcessHistory("COMMENTS","keysort","G0","!\n");
TOP: while(<INPUT>) {
tr/\015//d;
NEXT:if (/[>#]\s?exit$/) {
$clean_run=1;
last;
}
if (/^Error:/) {
print STDOUT ("$host clogin error: $_");
print STDERR ("$host clogin error: $_") if ($debug);
$clean_run=0;
last;
}
while (/#\s*($cmds_regexp)\s*$/) {
$cmd = $1;
if (!defined($prompt)) {
$prompt = ($_ =~ /^([^#]+#)/)[0];
$prompt =~ s/([][}{)(\\])/\\$1/g;
print STDERR ("PROMPT MATCH: $prompt\n") if ($debug);
}
print STDERR ("HIT COMMAND:$_") if ($debug);
if (! defined($commands{$cmd})) {
print STDERR "$host: found unexpected command - \"$cmd\"\n";
$clean_run = 0;
last TOP;
}
$rval = &{$commands{$cmd}};
delete($commands{$cmd});
if ($rval == -1) {
$clean_run = 0;
last TOP;
}
goto NEXT;
}
}
print STDOUT "Done $logincmd: $_\n" if ($log);
# Flush History
ProcessHistory("","","","");
# Cleanup
close(INPUT);
close(OUTPUT);
if (defined($ENV{NOPIPE})) {
unlink("$host.raw") if (! $debug);
}
# check for completeness
if (scalar(%commands) || !$clean_run) {
if (scalar(%commands)) {
printf(STDOUT "$host: missed cmd(s): %s\n", join(',', keys(%commands)));
printf(STDERR "$host: missed cmd(s): %s\n", join(',', keys(%commands))) if ($debug);
}
if (!$clean_run) {
print STDOUT "$host: End of run not found\n";
print STDERR "$host: End of run not found\n" if ($debug);
system("/usr/bin/tail -1 $host.new");
}
unlink "$host.new" if (! $debug);
}
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