check_requirements: add ping check; timout 1 sec in connection check

check_requirements

@@ -12,12 +12,13 @@
 # 2023-02-13  v1.0  ah  initial version with check for processes, tcp/ udp
 # 2023-02-15  v1.1  ah  add label
 # 2024-06-07  v1.2  ah  use iml help and add link to docs
+# 2025-02-11  v1.3  ah  add ping check; add timeout in connection check
 # ======================================================================
 
 
 . "$( dirname $0 )/inc_pluginfunctions"
 
-self_APPVERSION=1.2
+self_APPVERSION=1.3
 
 self=$( basename $0 )
 
@@ -63,6 +64,7 @@ PARAMETERS:
                          TYPE    string  one of tcp|udp
                          TARGET  string  target host
                          PORT    int     port number
+    -i|--ping TARGET     ping a target system
     -l|--label STRING    add label to divide the output in multiple sections
     -p|--process STRING  check if a process with given regex exists in the
                          output of 'ps aux'
@@ -124,6 +126,10 @@ function newline(){
 "
 }
 
+# ----------------------------------------------------------------------
+# check functions
+# ----------------------------------------------------------------------
+
 # check in process list
 # param  string  regex to search for in output of "ps aux"
 function chkProcess(){
@@ -145,7 +151,7 @@ function chkProcess(){
         newline
 }
 
-# check connection
+# Check connection
 # param  string  type: one of tcp|udp
 # param  string  target: a servername eg. localhost or www.example.com
 # param  integer port number to connect
@@ -155,11 +161,11 @@ function chkConnection(){
         local port="$3"     # port number
         
         COUNT+=1
-        if ! echo "$type/$target/$port" | grep -E "^(tcp|udp)/[a-z][a-z0-9\.\-]*/[1-9][0-9]*$" >/dev/null 2>&1; then
+        if ! echo "$type/$target/$port" | grep -Eq "^(tcp|udp)/[a-z][a-z0-9\.\-]*/[1-9][0-9]*$"; then
                 COUNTERR+=1
                 OUT+="ERROR  syntax error detected - verify params for port check; type=$type (one of tcp|udp) target=$target (servername to connect) port=$port"
         else
-                if (>/dev/$type/$target/$port) 2>/dev/null; then
+                if timeout 1 bash -c ">/dev/$type/$target/$port" 2>/dev/null; then
                         COUNTOK+=1
                         addOutput "OK" "connection" "$type to $target on port $port"
                 else
@@ -172,6 +178,25 @@ function chkConnection(){
         newline
 }
 
+# Check ping to a target
+# param  string  target: a servername eg. localhost or www.example.com
+function chkPing(){
+        local myHost="$1"
+        local cmdout
+
+        COUNT+=1
+        if cmdout="$( ping -c 1 $myHost 2>&1 )"; then
+                COUNTOK+=1
+                addOutput "OK" "ping" "ping to $myHost $( echo "$cmdout" | head -2 | tail -1 | rev | cut -f -1,2 -d ' ' | rev)"
+        else
+                COUNTERR+=1
+                ph.setStatus critical
+                addOutput "ERROR" "ping" "ping to host $myHost FAILED"
+        fi
+        addVerbose "$cmdout"
+        newline
+}
+
 # ----------------------------------------------------------------------
 # MAIN
 # ----------------------------------------------------------------------
@@ -184,6 +209,7 @@ fi
 # parse params
 while [[ "$#" -gt 0 ]]; do case $1 in
     -c|--connect)   chkConnection "$2" "$3" "$4"; shift;shift;shift;shift ;; 
+    -i|--ping)      chkPing "$2"; shift;shift ;; 
     -l|--label)     showLabel "$2"; shift;shift ;; 
     -p|--process)   chkProcess "$2";shift 2;;
     -h|--help)      showHelp; exit 0;;