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From cd0d4478916ff203db1d3e403b99a58d60d7c5ec Mon Sep 17 00:00:00 2001
From: Rany Hany <rany_hany@riseup.net>
Date: Thu, 2 Jan 2025 14:26:07 +0200
Subject: [PATCH 5/5] netstat: drop `netstat -s` dep by using `/proc/net/snmp`
data directly
This allows the plugin to work under OpenWRT as the busybox netstat
does not support `netstat -s`.
Fixes: https://github.com/munin-monitoring/muninlite/issues/14
Signed-off-by: Rany Hany <rany_hany@riseup.net>
---
muninlite.in | 2 +-
plugins/netstat | 54 +++++++++++++++++++++++++++++++++++++++++++------
2 files changed, 49 insertions(+), 7 deletions(-)
--- a/muninlite.in
+++ b/muninlite.in
@@ -87,7 +87,7 @@ for PLUG in $PLUGINS; do
done
;;
netstat)
- if netstat -s >/dev/null 2>&1; then
+ if [ -f /proc/net/snmp ]; then
RES="$RES netstat"
fi
;;
--- a/plugins/netstat
+++ b/plugins/netstat
@@ -31,10 +31,52 @@ config_netstat() {
echo "established.info The number of currently open connections."
}
fetch_netstat() {
- NINFO=$(netstat -s | sed 's/ \{1,\}/ /g')
- echo "active.value" "$(echo "$NINFO" | grep "active connection" | cut -d " " -f 2)"
- echo "passive.value" "$(echo "$NINFO" | grep "passive connection" | cut -d " " -f 2)"
- echo "failed.value" "$(echo "$NINFO" | grep "failed connection" | cut -d " " -f 2)"
- echo "resets.value" "$(echo "$NINFO" | grep "connection resets" | cut -d " " -f 2)"
- echo "established.value" "$(echo "$NINFO" | grep "connections established" | cut -d " " -f 2)"
+ awk '
+ BEGIN {
+ TcpNR = -1
+ ActiveOpens = -1
+ PassiveOpens = -1
+ AttemptFails = -1
+ EstabResets = -1
+ CurrEstab = -1
+ }
+
+ /^Tcp: / {
+ if (++TcpNR == 0) {
+ for (i = 1; i <= NF; i++) {
+ if ($i == "ActiveOpens") {
+ ActiveOpens = i
+ } else if ($i == "PassiveOpens") {
+ PassiveOpens = i
+ } else if ($i == "AttemptFails") {
+ AttemptFails = i
+ } else if ($i == "EstabResets") {
+ EstabResets = i
+ } else if ($i == "CurrEstab") {
+ CurrEstab = i
+ }
+ }
+ } else if (TcpNR == 1) {
+ if (ActiveOpens < 1 || PassiveOpens < 1 || AttemptFails < 1 || EstabResets < 1 || CurrEstab < 1) {
+ TcpNR = -1
+ } else {
+ print "active.value " $ActiveOpens
+ print "passive.value " $PassiveOpens
+ print "failed.value " $AttemptFails
+ print "resets.value " $EstabResets
+ print "established.value " $CurrEstab
+ }
+ }
+ }
+
+ END {
+ if (TcpNR < 1) {
+ print "active.value 0"
+ print "passive.value 0"
+ print "failed.value 0"
+ print "resets.value 0"
+ print "established.value 0"
+ }
+ }
+ ' /proc/net/snmp
}
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