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#!/bin/bash
# Author: Joe Maimon
# Released to public domain
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the Free
# Software Foundation; either version 2 of the License, or (at your option)
# any later version.
#
# This program 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; see the file COPYING; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
PROGNAME=`basename $0`
VERSION="0.0.6"
#api fields
EV_ID="eventid"
EV_TYPE="type"
EV_OTYPE="old_type"
EV_NUMNHS="num_nhs"
EV_INT="interface"
EV_LADDR="local_address"
EV_VCINIT="vc_initiated"
EV_LNBMA="local_nbma"
EV_LCERT="local_cert"
EV_RADDR="remote_addr"
EV_RNBMA="remote_nbma"
EV_RCERT="remote_cert"
usage()
{
echo "Usage: $PROGNAME [-s nhrp-sock] [-d] [-i interface-name] [-t table] [-e execute-cmd] [-u user] [-g group] [-r] [-l logfile]"
echo ""
echo "-s nhrp-sock file"
echo "-i interface-name to execute on, may be repeated multiple times"
echo "-t tableid to execute on for immdiate preceeding interface"
echo "-e execute command for immmediate preceeding interface"
echo " The command will be passed the following arguments $EV_ID $EV_TYPE $EV_INT $EV_LNMBA $EV_RADDR $EV_RNBMA int_table"
echo "-u user to own the sock"
echo "-g group to own the sock"
echo "-r send rejection (testing)"
echo "-l logfile to record conversation with nhrpd"
echo "-d daemonize"
exit 1
}
declare -A EXECARR
declare -A TABLEARR
declare -Ag NHRPEVENT
SOCK="/var/run/frr/nhrp.sock"
USER="frr"
GROUP="frr"
DAEMON=0
j=0
RESULT="accept"
while getopts rds:i:u:g:l:t:e: opt; do
case "$opt" in
d)
DAEMON=1
;;
s)
SOCK="$OPTARG"
;;
i)
INTARR[((j++))]="$OPTARG"
;;
e)
if [[ "$j" == "0" ]] || [[ "${INTARR[((j-1))]}" == "" ]]; then
echo "execute argument must follow interface argument"
usage
fi
EXECARR["${INTARR[((j-1))]}"]="$OPTARG"
;;
t)
if [[ "$j" == "0" ]] || [[ "${INTARR[((j-1))]}" == "" ]]; then
echo "execute argument must follow interface argument"
usage
fi
TABLEARR["${INTARR[((j-1))]}"]="$OPTARG"
;;
u)
USER="$OPTARG"
;;
g)
GROUP="$OPTARG"
;;
r)
RESULT="reject"
;;
l)
EVLOGFILE="${OPTARG}"
;;
esac;
done
if [[ "$EVLOGFILE" != "" ]]; then
if [[ ! -w "${EVLOGFILE}" ]]; then
touch "$EVLOGFILE" || ( echo "Cannot write to logfile $EVLOGFILE" ; usage )
fi
echo -e "PROG: $0 Startup\nPROG: Arguments $*" >> $EVLOGFILE
fi
function mainloop()
{
if [[ "$EVLOGFILE" != "" ]]; then
echo -e "PROG: `date -R`\nPROG: Starting mainloop" >> $EVLOGFILE
fi
coproc socat - UNIX-LISTEN:$SOCK,unlink-early,setuid-early=$USER,unlink-close=0 || exit 1
test -S $SOCK && chown $USER:$GROUP $SOCK
OLDIFS="$IFS"
TABLE="table "
while read -r S; do
if [[ "$EVLOGFILE" != "" ]]; then
echo "IN: $S" >> $EVLOGFILE
fi
if [[ "$S" == "" ]]; then
if [[ "${NHRPEVENT[$EV_ID]}" != "" ]]; then
OUTMSG="eventid=${NHRPEVENT[$EV_ID]}\nresult=$RESULT\n"
echo -e "$OUTMSG" >&"${COPROC[1]}"
if [[ "$EVLOGFILE" != "" ]]; then
echo -e "OUT:\n${OUTMSG}" >> $EVLOGFILE;
fi
fi
for((i=0;i<${#INTARR[@]};i++)); do
if [[ "${NHRPEVENT[$EV_INT]}" == "" ]]; then break; fi
if [[ "${INTARR[$i]}" != "${NHRPEVENT[$EV_INT]}" ]]; then continue; fi
EVINT="${NHRPEVENT[$EV_INT]}"
if [[ "${NHRPEVENT[$EV_RADDR]}" == "" ]]; then break; fi
if [[ "${NHRPEVENT[$EV_RNBMA]}" == "" ]]; then break; fi
if [[ "${NHRPEVENT[$EV_TYPE]}" != "dynamic" ]]; then break; fi
INTEXEC=${EXECARR["$EVINT"]}
INTABLE=${TABLEARR["$EVINT"]}
unset CMD
unset CMDEND
CMDADD="ip neigh add "
CMDREPL="ip neigh replace"
CMDBEG="$CMDADD"
if [[ "$INTEXEC" != "" ]]; then
CMD="$INTEXEC ${NHRPEVENT[$EV_ID]:-nil}"
CMD="$CMD ${NHRPEVENT[$EV_TYPE]:-nil}"
CMD="$CMD ${NHRPEVENT[$EV_INT]:-nil}"
CMD="$CMD ${NHRPEVENT[$EV_LNBMA]:-nil}"
CMD="$CMD ${NHRPEVENT[$EV_RADDR]:-nil}"
CMD="$CMD ${NHRPEVENT[$EV_RNBMA]:-nil}"
CMD="$CMD ${INTABLE:-nil}"
unset CMDBEG
else
CMDTAB="${INTABLE:+${TABLE}${INTABLE}}"
CMDEND="$CMDEND ${NHRPEVENT[$EV_RADDR]} dev $EVINT lladdr ${NHRPEVENT[$EV_RNBMA]} nud noarp"
CMD="$CMDEND"
fi
unset CMDTAB
for ((k=0;k<2;k++)); do
for ((l=0;l<2;l++)); do
if [[ "$EVLOGFILE" != "" ]]; then
echo "PROG: Executing $CMD" >> $EVLOGFILE
CMDOUT=`$CMDBEG $CMD $CMDTAB 2>&1`
CMDRET="$?"
if [[ "$CMDOUT" != "" ]]; then
echo "PROG: Execution output: $CMDOUT" >> $EVLOGFILE
fi
else
$CMDBEG $CMD $CMDTAB
fi
if [[ "$CMDTAB" == "" ]] || [[ "$INTEXEC" != "" ]]; then break; fi
done
if [[ "$INTEXEC" != "" ]] || [[ "$CMDRET" == "0" ]]; then
break
fi
CMDBEG="$CMDREPL"
done
break
done
unset NHRPEVENT
declare -Ag NHRPEVENT
continue
continue;
fi
IFS="${IFS}="
SA=($S)
IFS="$OLDIFS"
eval NHRPEVENT[${SA[0]}]="\"${SA[1]}\""
done <&"${COPROC[0]}"
if [[ "$COPROC_PID" != "" ]]; then kill "$COPROC_PID"; fi
}
while true; do
mainloop $*
if [[ "$DAEMON" == "0" ]]; then
break;
fi
sleep 10
done
|
