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@@ -1,6 +1,6 @@
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#!/bin/sh
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-# Copyright (C) 2014 Internet Systems Consortium, Inc. ("ISC")
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+# Copyright (C) 2014-2015 Internet Systems Consortium, Inc. ("ISC")
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#
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# Permission to use, copy, modify, and/or distribute this software for any
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# purpose with or without fee is hereby granted, provided that the above
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@@ -65,48 +65,75 @@ usage() {
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}
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### Functions managing Kea processes ###
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+# Contructs a server's PID file based on its binary name, the config file,
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+# and the --localstatedir and returns the contents as $_pid. If the file
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+# does not exist, the value of $_pid is 0. If the file exists but cannot
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+# be read the function exists with a error message. Note the PID file name
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+# is always returned in $_pid_file.
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+get_pid_from_file() {
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+ local proc_name=${1} # Process name.
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+
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+ # Extract the name portion of the config file
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+ local conf_name=$(basename ${kea_config_file} | cut -f1 -d'.')
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+
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+ # Default the directory to --localstatedir
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+ local pid_file_dir=@localstatedir@/@PACKAGE@
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+
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+ # Use directory override if set (primarily for testing only)
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+ if [ ! -z $KEA_PIDFILE_DIR ]; then
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+ pid_file_dir=${KEA_PIDFILE_DIR}
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+ fi
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-# Returns a list of existing PIDs and a number of PIDs for the process
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-# having a name specified as an argument to the function.
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-get_pids() {
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- local proc_name=${1} # Process name.
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- # Return the list of PIDs.
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- _get_pids=$(ps axwwo pid,command | grep ${proc_name} | grep -v grep \
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- | awk '{print $1}')
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- # Return the number of PIDs.
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- _get_pids_num=$(printf "%s" "${_get_pids}" | wc -w | awk '{print $1}')
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+ # construct the PID file name
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+ _pid_file="${pid_file_dir}/${conf_name}.${proc_name}.pid"
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+
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+ # Grab the PID if the file exists
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+ if [ -e ${_pid_file} ]; then
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+ _pid=`cat ${_pid_file}`
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+ if [ $? -ne 0 ]; then
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+ log_error "Error reading PID file: ${_pid_file}"
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+ fi
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+ else
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+ # No file, means no pid
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+ _pid=0;
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+ fi
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}
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-# Checks if the specified process is running. Internally it calls get_pids
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-# to get the number of processes.
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+
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+# Checks if the specified process is running by reading its
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+# PID file and checking the PID it contains. If the file does
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+# not exist, the process is assumed to not be running.
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check_running() {
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local proc_name=${1} # Process name.
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# Initially mark the process as not running.
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_running=0
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- get_pids ${proc_name}
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- # If the number of pids is non-zero, the process is running.
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- if [ ${_get_pids_num} -gt 0 ]; then
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- _running=1
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+
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+ # Get the PID from the PID file (if it exists)
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+ get_pid_from_file ${proc_name}
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+ if [ ${_pid} -gt 0 ]; then
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+ # Use kill -0 to check if PID is alive
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+ kill -0 ${_pid}
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+ if [ $? -eq 0 ]; then
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+ # No error, so PID IS ALIVE
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+ _running=1
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+ fi
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fi
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}
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-# Sends a signal to a group of processes having a specified name.
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+# Sends a signal to a process based on its PID file
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send_signal() {
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local sig=${1} # Signal number
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local proc_name=${2} # Process name.
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- # Get all PIDs for the specified process name.
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- get_pids ${proc_name}
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- # If no processes running, there is no process we can send the signal
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- # to. This is not neccessarily an error.
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- if [ -z ${_get_pids} ]; then
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+
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+ get_pid_from_file ${proc_name}
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+ if [ ${_pid} -eq 0 ]; then
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log_info "Skip sending signal ${sig} to process ${proc_name}: \
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process is not running\n"
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- return
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- fi
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- # Send a signal to all processes.
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- kill -${sig} ${_get_pids} >/dev/null 2>&1
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- if [ $? -ne 0 ]; then
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- log_error "Failed to send signal ${sig} to process ${proc_name}.\n"
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+ else
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+ kill -${sig} ${_pid}
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+ if [ $? -ne 0 ]; then
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+ log_error "Failed to send signal ${sig} to process ${proc_name}, PID {$_pid}.\n"
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+ fi
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fi
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}
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@@ -121,8 +148,8 @@ start_server() {
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check_running ${binary_name}
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# If process is running, don't start another one. Just log a message.
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if [ ${_running} -ne 0 ]; then
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- log_info "Skip starting ${binary_name} \
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-as another instance is already running."
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+ log_info "${binary_name} appears to be running, see: \
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+PID ${_pid}, PID file: ${_pid_file}."
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else
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log_info "Starting ${binary_name} ${args}"
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# Start the process.
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@@ -130,6 +157,50 @@ as another instance is already running."
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fi
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}
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+# Instruct Kea process to shutdown by sending it signal 15
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+stop_server() {
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+ binary_path=${1} # Full path to the binary.
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+ local sig=15
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+ # Extract the name of the binary from the path.
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+ local binary_name=$(basename ${binary_path})
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+
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+ # Use the binary name to check if the process is already running.
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+ check_running ${binary_name}
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+ # If process isn't running, don't start another one. Just log a message.
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+ if [ ${_running} -eq 0 ]; then
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+ log_info "${binary_name} isn't running."
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+ else
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+ log_info "Stopping ${binary_name}..."
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+ kill -${sig} ${_pid}
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+ if [ $? -ne 0 ]; then
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+ log_error "Stop failed, could not send signal ${sig} \
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+to process ${proc_name}, PID ${_pid}.\n"
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+ fi
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+ fi
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+}
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+
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+# Instruct Kea process to reload config by sending it signal 1
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+reload_server() {
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+ binary_path=${1} # Full path to the binary.
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+ local sig=1
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+ # Extract the name of the binary from the path.
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+ local binary_name=$(basename ${binary_path})
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+
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+ # Use the binary name to check if the process is already running.
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+ check_running ${binary_name}
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+ # If process isn't running, don't start another one. Just log a message.
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+ if [ ${_running} -eq 0 ]; then
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+ log_info "${binary_name} isn't running."
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+ else
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+ log_info "Reloading ${binary_name}..."
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+ kill -${sig} ${_pid}
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+ if [ $? -ne 0 ]; then
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+ log_error "Reload failed, could not send signal ${sig} \
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+to process ${proc_name}, PID ${_pid}.\n"
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+ fi
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+ fi
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+}
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+
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# Run the specified command if the server has been enabled.
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# In order for the command to run, the following conditions have to be met:
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# - server must be on the list of servers (e.g. specified from command line)
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@@ -301,18 +372,18 @@ case ${command} in
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# Stop running servers.
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stop)
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# Stop all servers or servers specified from the command line.
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- run_conditional "dhcp4" "send_signal 15 $(basename ${dhcp4_srv})" 0
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- run_conditional "dhcp6" "send_signal 15 $(basename ${dhcp6_srv})" 0
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- run_conditional "dhcp_ddns" "send_signal 15 $(basename ${dhcp_ddns_srv})" 0
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+ run_conditional "dhcp4" "stop_server ${dhcp4_srv}" 0
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+ run_conditional "dhcp6" "stop_server ${dhcp6_srv}" 0
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+ run_conditional "dhcp_ddns" "stop_server ${dhcp_ddns_srv}" 0
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exit 0 ;;
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# Reconfigure the servers.
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reload)
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# Reconfigure all servers or servers specified from the command line.
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- run_conditional "dhcp4" "send_signal 1 $(basename ${dhcp4_srv})" 0
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- run_conditional "dhcp6" "send_signal 1 $(basename ${dhcp6_srv})" 0
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- run_conditional "dhcp_ddns" "send_signal 1 $(basename ${dhcp_ddns_srv})" 0
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+ run_conditional "dhcp4" "reload_server ${dhcp4_srv}" 0
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+ run_conditional "dhcp6" "reload_server ${dhcp6_srv}" 0
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+ run_conditional "dhcp_ddns" "reload_server ${dhcp_ddns_srv}" 0
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exit 0 ;;
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Thomas Markwalder