entrypoint.sh

#!/usr/bin/env bash
set -euo pipefail

COMMUNITY="${SNMP_COMMUNITY:-public}"
SYSLOCATION="${SNMP_LOCATION:-lab}"
SYSCONTACT="${SNMP_CONTACT:-n/a}"
DEBUG_LEVEL="${DEBUG_LEVEL:-0}"

# Extract --name and --debug-level if provided
DEVICE_NAME="switch-01"
ARGS=("$@")

for ((i=0; i<${#ARGS[@]}; i++)); do
  case "${ARGS[$i]}" in
    --name)
      if [[ $((i+1)) -lt ${#ARGS[@]} ]]; then
        DEVICE_NAME="${ARGS[$((i+1))]}"
      fi
      ;;
    --debug-level)
      if [[ $((i+1)) -lt ${#ARGS[@]} ]]; then
        DEBUG_LEVEL="${ARGS[$((i+1))]}"
      fi
      ;;
  esac
done

mkdir -p /var/agentx

cat > /etc/snmp/snmpd.conf <<EOF
agentAddress udp:161
rocommunity ${COMMUNITY}

sysLocation ${SYSLOCATION}
sysContact ${SYSCONTACT}
sysName ${DEVICE_NAME}

master agentx
agentxsocket /var/agentx/master

dontLogTCPWrappersConnects yes
EOF

SNMPD_OPTS="-f -C -c /etc/snmp/snmpd.conf"

if [[ "${DEBUG_LEVEL}" -ge 1 ]]; then
  echo "[*] Starting snmpd (AgentX master), debug_level=${DEBUG_LEVEL}"
fi

if [[ "${DEBUG_LEVEL}" -ge 2 ]]; then
  SNMPD_OPTS+=" -Lo"
else
  # Completely quiet
  SNMPD_OPTS+=" -LS0-6d"
fi

snmpd ${SNMPD_OPTS} &
SNMPD_PID=$!

for _ in $(seq 1 50); do
  [[ -S /var/agentx/master ]] && break
  sleep 0.1
done

if [[ ! -S /var/agentx/master ]]; then
  echo "[!] AgentX socket not found, exiting"
  kill "${SNMPD_PID}" || true
  exit 1
fi

if [[ "${DEBUG_LEVEL}" -ge 1 ]]; then
  echo "[*] Starting AgentX subagent"
fi

exec /usr/local/bin/agentx_switch "$@"