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#!/bin/bash -e
#
# sync-router shell scripts to synchronize cisco configuration and DHCP static
# lease files with with GIT repository. Operations performed:
# - update header of modified DHCP static lease files, upload
# them using using scp and add them to the next commit
# - restart Cisco DHCP service after updating static lease files
# - copy Cisco startup-config using scp and add to next commit
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# - update IOS image files on the router when checked in to the
# repository, update startup-config file accordingly on router
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# - commit changes to the git repository
#
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# Version 1.2, latest version at: https://gitlab.lindenaar.net/scripts/cisco
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#
# Copyright (c) 2016 Frederik Lindenaar
#
# This script is free software: you can redistribute and/or modify it under the
# terms of version 3 of the GNU General Public License as published by the Free
# Software Foundation, or (at your option) any later version of the license.
#
# This script is distributed in the hope that it will be useful but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE. See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along with
# this program. If not, visit <http://www.gnu.org/licenses/> to download it.
### Configuration ###
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router=`basename \`dirname $0 | pwd\`` # name of router - based on directory
dhcpfiles=dhcp-\* # list/pattern of dhcp lease files
imagefiles=c??00-universalk9-mz.S[SP]A.\* # list/pattern of IOS image files
filestore=flash # location of dhcp/IOS files on cisco
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### Implementation ###
echo updating with $router
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# Support function to print an error message and quit with an error exit code(1)
# parameters: $1 - message to be printed
fail() {
echo FATAL: ${1?ERROR: no error message provided for fail()}, aborted
exit 1
}
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# Support function to download a file from the router
# parameters: $1 - filename to be copied and $2 - (optional) target filename
# when no target filename is provided the source file will be downloaded to the
# current directory with the same name. Adds downloaded file to git changeset
router_file_download() {
fromfile=${1?ERROR: at least one filename is required to copy from router}
tofile=${2:-$fromfile}
if [ "$fromfile" == startup-config ]; then
filesrc=nvram
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else
filesrc=$filestore
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fi
echo downloading $tofile from router $filesrc
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if scp -q $router:$filesrc:$fromfile $tofile; then
git add $tofile
else
fail "download of $tofile failed"
fi
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}
# Support function to upload a file to the router
# parameters: $1 - filename to be copied and $2 - (optional) target filename
# when a target filename is provided the source file will be moved to the target
# file after uploading and the target file is added to the git changeset
router_file_upload() {
fromfile=${1?ERROR: at least one filename is required to copy to router}
tofile=${2:-$fromfile}
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if [ "$tofile" == startup-config ]; then
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filedst=nvram
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else
filedst=$filestore
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fi
echo uploading new/updated $tofile to router $filedst
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if scp -q $fromfile $router:$filedst:$tofile; then
if [ "$fromfile" != "$tofile" ]; then
mv $fromfile $tofile
git add $tofile
fi
else
fail "upload of $tofile failed"
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fi
}
# Support function to remove a file from the router
# parameters: $1 - filename to be removed
router_file_remove() {
delfile=${1?ERROR: need a filename to remove from router}
echo removing $delfile as it is no longer in the repository
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if ! ssh -q $router "delete /force $filestore:$delfile"; then
fail "removal of $delfile failed"
fi
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}
# Fetch the start-up configuration from the router
router_file_download startup-config
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# Process the DHCP static lease files that have changed
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git status -s "$dhcpfiles" | while read status filename token newfilename
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do
case $status in
\?\?)
echo skipping $filename as it is not yet added to the repository
;;
D)
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router_file_remove $filename
;;
R)
router_file_remove $filename
router_file_upload $newfilename
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;;
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A |M|MM)
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echo updating and uploading modified file $filename
head -2 $filename | while read tag value
do
case $tag in
\*time\*)
date +"$tag %h %d %Y %l:%M %p" > .$filename.$$.tmp
;;
\*version\*)
echo $tag $[ $value + 1 ] >> .$filename.$$.tmp
;;
*)
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fail "found unknown entry \"$tag $value\" in $filename"
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;;
esac
done
tail +3 $filename >> .$filename.$$.tmp
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router_file_upload .$filename.$$.tmp $filename
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;;
*)
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fail "unsupported git status \"$status\" for $filename"
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;;
esac
done
# Restart the DHCP service on the router if any of the dhcp files changed
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if git status -s "$dhcpfiles" | egrep -q ^[MAD]; then
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echo restarting DHCP service
cat << EOT | if ! ssh -q $router; then
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configure terminal
no service dhcp
service dhcp
exit
exit
EOT
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fail "unable to restart DHCP service"
fi
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fi
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# Process the IOS image files that have changed
git status -s "$imagefiles" | while read status filename token newfilename
do
case $status in
\?\?)
echo skipping $filename as it is not yet added to the repository
;;
R)
router_file_remove $filename
router_file_upload $newfilename
;;
D)
router_file_remove $filename
;;
A |M)
router_file_upload $filename
;;
*)
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fail "unsupported git status \"$status\" for $filename"
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;;
esac
done
# Update the boot images in the startup-config file if we're updating any images
if git status -s "$imagefiles" | egrep -q ^[MADR]; then
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fgrep -n "boot system $filestore" startup-config | cut -d: -f1 > .startup-config.$$.lines
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head -$[ `head -1 .startup-config.$$.lines` -1 ] startup-config > .startup-config.$$
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git ls-files $imagefiles | sort -r | sed "s/^/boot system $filestore /g" >> .startup-config.$$
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tail +$[ `tail -1 .startup-config.$$.lines` +1 ] startup-config >> .startup-config.$$
rm .startup-config.$$.lines
router_file_upload .startup-config.$$ startup-config
fi
# show what has changed in the startup config and commit to the repository
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git diff --cached startup-config
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git commit || git reset HEAD startup-config
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