Random ping utility, to be used by a Generic Endpoint

Signed-off-by: Jed Reynolds <jed@bitratchet.com>

rping.bash

@@ -0,0 +1,114 @@
+#!/bin/bash
+
+## ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ##
+##  Ping a random ip every second, indefinitely. The ping command
+##  has a deadline of *count* seconds and wait time of 1 second.
+##  This script is aware of vrf_exec.bash and LF_NO_USE_VRF.
+##
+##  Example Usage:
+##
+##  Ping a random ip once from port br0 every second:
+##  ./rping.bash -p br0 -c 1
+##
+##  Default to eth1, ping 4 random IPs, ping each ip 10 times
+##  ./rping.bash -r 4 -c 10
+##
+##  Ping 4 random IPs, ping each ip 10 times, from port br1
+##  ./rping.bash -r 4 -c 10 -pbr1
+##
+## ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ##
+# set -vux
+
+HL="/home/lanforge"
+HL_VX="$HL/vrf_exec.bash"
+UV=1
+if [ -f $HL/LF_NO_USE_VRF ]; then
+    UV=0
+fi
+if [ ! -x $HL_VX ]; then
+    UV=0
+fi
+
+usage() {
+    echo "Usage: $0 [-p port] [-c count of pings per ip] [-r number random ips] [-d seconds duration]"
+}
+
+PORT=eth1
+COUNT=1
+NUM_IP=0
+DURATION=0
+
+while getopts "hi:c:d:p:" OPT; do
+    case "${OPT}" in
+        c) COUNT="${OPTARG}"
+            ;;
+        d) DURATION="${OPTARG}"
+            if (( $DURATION < 0 )); then
+                echo "$0: duration cannot be negative"
+                exit 1
+            fi
+            ;;
+        h) usage
+            exit 0
+            ;;
+        i) NUM_IP="${OPTARG}"
+            ;;
+        p) PORT="${OPTARG}"
+            ;;
+        *) echo "Unknown option $OPT";
+            usage
+            exit 1
+            ;;
+    esac
+done
+
+if [[ x$PORT == x ]]; then
+    echo "$0: no port" >&2
+    return 1
+fi
+
+# this is unfiltered and will ping network numbers, broadcast numbers and
+# multicast addresses, if you need a specific range, you should add that
+# logic near here
+rand_ip() {
+    printf "%d.%d.%d.%d" \
+        "$((RANDOM % 256))" \
+        "$((RANDOM % 256))" \
+        "$((RANDOM % 256))" \
+        "$((RANDOM % 256))"
+}
+
+my_ping() {
+    if [[ x$1 == x ]]; then
+        echo "$0: my_ping: cannot ping empty ip" >&2
+        return 1
+    fi
+
+    if (($UV == 1)); then
+        $HL_VX $PORT ping -c $COUNT  -D -i1 -n -w$COUNT -W1 "$1"
+    else
+        ping -I$PORT -c $COUNT -D -i1 -n -w$COUNT -W1 "$1"
+    fi
+}
+
+IP_LIST=()
+if (( NUM_IP != 0 )); then
+    for n in `seq 1 $NUM_IP`; do
+        IP_LIST+=($(rand_ip))
+    done
+fi
+
+counter=0;
+mod=$NUM_IP
+while true; do
+    if (( $NUM_IP > 0 )); then
+        i=$(($counter % $NUM_IP))
+        randi="${IP_LIST[$i]}"
+        counter=$((counter++))
+    else
+        randi=$(rand_ip)
+    fi
+    my_ping "$randi"
+    sleep 1
+done
+#