init.stud

#!/bin/sh

### BEGIN INIT INFO                                                                                                                                                                                                                          
# Provides:          stud                                                                                                                                                                                                                
# Required-Start:    $local_fs $remote_fs                                                                                                                                                                                                    
# Required-Stop:     $local_fs $remote_fs                                                                                                                                                                                                    
# Should-Start:      $syslog                                                                                                                                                                                                                 
# Should-Stop:       $syslog                                                                                                                                                                                                                 
# Default-Start:     2 3 4 5                                                                                                                                                                                                                 
# Default-Stop:      0 1 6                                                                                                                                                                                                                   
# Short-Description: Start or stop stud (SSL offloader)                                                                                                                                                              
### END INIT INFO  

#######################################################
#                      GLOBALS                        #
#######################################################

# instance configuration directory
CONFIG_DIR="/etc/stud"

# Runtime directory data
RUNTIME_DIR="/var/run/stud"

#######################################################

#######################################################

stud_single_instance_config_reset() {
#######################################################
#            stud instance configuration              #
#######################################################

# stud listening address
FRONTEND_ADDRESS="*,8443"

# upstream service address
BACKEND_ADDRESS="127.0.0.1,80"

# x509 certificate file
CERT_FILE=""

# TLS only service? Don't set this to 1 if you're
# offloading HTTPS.
TLS_ONLY="0"

# cipher suite (run openssl ciphers for full list)
CIPHER_SUITE="HIGH"

# OpenSSL engine
ENGINE=""

# Number of worker processes
WORKERS="1"

# Listen backlog
BACKLOG=""

# Chroot directory
CHROOT_DIR=""

# drop privileges and run as specified
# user if set
SETUID_USER=""

# use shared cache with specified number of sessions
# WARNING: stud must be compiled with USE_SHARED_CACHE=1
SHARED_CACHE_SESSIONS="0"

# Accept cache updates on specified address
#
# syntax: HOST,PORT
#
# WARNING: stud must be compiled with USE_SHARED_CACHE=1
#          SHARED_CACHE_SESSIONS must be >= 1
CACHE_UPDATE_ACCEPT=""

# Send cache updates to specified list space separated peers
#
# syntax: HOST1,PORT HOST2,PORT
#
# WARNING: stud must be compiled with USE_SHARED_CACHE=1
#          and CACHE_UPDATE_ACCEPT must be defined
CACHE_UPDATE_SEND=""

# Force network interface and ttl to receive and send multicast
# cache updates
#
# syntax: IFACE[,TTL]
#
# WARNING: stud must be compiled with USE_SHARED_CACHE=1
#          and CACHE_UPDATE_ACCEPT must be defined
CACHE_UPDATE_IFACE=""

# default tcp keepalive on client socket in seconds
CLIENT_TCP_KEEPALIVE_SEC=""

# log to syslog?
SYSLOG="1"

# Enable write-ip?
WRITE_IP="0"

# Enable SENDPROXY protocol; see
# http://haproxy.1wt.eu/download/1.5/doc/proxy-protocol.txt
# for additional info
WRITE_PROXY="0"

# Alternative OpenSSL library dir
# Use this if you'd like to run stud with different
# version of OpenSSL library
OPENSSL_LIB_DIR=""

# Semicolon separated list of process affinities; requires
# taskset(8) utility.
#
# SYNTAX:
#   "<process_number>:<affinity>;<process_number2>:<affinity2>;..."
#
# <process_number>:      stud worker process number, starting with 1
# <affinity>:            process affinity, see taskset(8) for details
#
# EXAMPLES:
#
#   "1:0"                => bind first process to CPU0
#
#   "1:0;2:3-4;3:5;4:7"  => bind first worker process to CPU0,
#                        second worker process to CPU3 and CPU4,
#                        third worker process to CPU5 and fourth
#                        worker process to CPU7
PROCESS_AFFINITY=""

# Process priority (integer between -19 to 19)
# lower value means higher priority
#
PROCESS_PRIORITY=""

# ulimit -n value before starting single stud instance
#
# Comment out or set to 0 to disable ulimit -n
# setup.
#
ULIMIT_N=""

# Additional stud command line options
#
# NOTE: set this only if you really know what your're
#       doing
# 
# ADDITIONAL_STUD_OPT=""

# EOF
}

PATH="${PATH}:."
INSTANCE_NAME=""
STUD=`which stud 2>/dev/null`

die() {
  msg_log "FATAL: $@"
  echo "FATAL: $@" 1>&2
  exit 1
}

msg_log() {
  ident="stud"
  test ! -z "${INSTANCE_NAME}" && ident="${ident}/${INSTANCE_NAME}"
  logger -i -t "${ident}" "$@" >/dev/null 2>&1
}

msg_err() {
  msg_log "ERROR: $@"
}


_real_single_instance_start() {
  # check stud binary
  if [ -z "${STUD}" ] || [ ! -f "${STUD}" ] || [ ! -x "${STUD}" ]; then
    die "Invalid stud binary: '${STUD}'"
  fi

  # generate stud command line options
  opts="-f ${FRONTEND_ADDRESS}"
  opts="${opts} -b ${BACKEND_ADDRESS}"
  
  if [ "${TLS_ONLY}" = "1" ]; then
    opts="${opts} --tls"
  else
    opts="${opts} --ssl"
  fi

  test ! -z "${CIPHER_SUITE}" && opts="${opts} -c ${CIPHER_SUITE}"
  test ! -z "${ENGINE}" && opts="${opts} -e ${ENGINE}"

  if [ ! -z "${WORKERS}" ] && [ ${WORKERS} -gt 0 ]; then
    opts="${opts} -n ${WORKERS}"
  fi

  if [ ! -z "${BACKLOG}" ] && [ ${BACKLOG} -gt 0 ]; then
    opts="${opts} -B ${BACKLOG}"
  fi

  if [ ! -z "${CLIENT_TCP_KEEPALIVE_SEC}" ] && [ ${CLIENT_TCP_KEEPALIVE_SEC} -gt 0 ]; then
    opts="${opts} -k ${CLIENT_TCP_KEEPALIVE_SEC}"
  fi

  # shared cache sessions...
  if [ ! -z "${SHARED_CACHE_SESSIONS}" ] && [ ${SHARED_CACHE_SESSIONS} -gt 0 ]; then
    opts="${opts} -C ${SHARED_CACHE_SESSIONS}"

    # shared cache stuff
    if [ ! -z "${CACHE_UPDATE_ACCEPT}" ]; then
      opts="${opts} -U ${CACHE_UPDATE_ACCEPT}"

      c_u=0
      for h in ${CACHE_UPDATE_SEND}; do
        test ! -z "${h}" || continue
        opts="${opts} -P ${h}"
        c_u=$((c_u + 1))
      done
      if [ ${c_u} -lt 1 ]; then
        die "Cache updates are enabled but CACHE_UPDATE_SEND option seems to be empty."
      fi

      if [ ! -z "${CACHE_UPDATE_IFACE}" ]; then
        opts="${opts} -M ${CACHE_UPDATE_IFACE}"
      fi
    fi
    
  fi

  # chroot?
  test ! -z "${CHROOT_DIR}" && opts="${opts} -r ${CHROOT_DIR}"
  test ! -z "${SETUID_USER}" && opts="${opts} -u ${SETUID_USER}"

  opts="${opts} -q"
  test "${SYSLOG}" = "1" && opts="${opts} -s"

  test "${WRITE_IP}" = "1" && opts="${opts} --write-ip"
  test "${WRITE_PROXY}" = "1" && opts="${opts} --write-proxy"

  if [ ! -z "${CERT_FILE}" ] && [ -f "${CERT_FILE}" ] && [ -r "${CERT_FILE}" ]; then
    opts="${opts} ${CERT_FILE}"
  else
    die "Invalid or unreadable certificate file '${CERT_FILE}'."
  fi

  # additional command line options?!
  if [ ! -z "${ADDITIONAL_STUD_OPT}" ]; then
    opts="${opts} ${ADDITIONAL_STUD_OPT}"
  fi

  # priority?!
  prefix=""
  if [ ! -z "${PROCESS_PRIORITY}" ]; then
    prefix="nice -n ${PROCESS_PRIORITY}"
  fi

  # we want to start stud in a daemon mode...
  opts="${opts} --daemon"

  # set ulimits!
  ulimit_set || die "Unable to set stud runtime limits."

  # disable linker stuff
  unset LD_LIBRARY_PATH

  # set new lib path if requested
  if [ ! -z "${OPENSSL_LIB_DIR}" -a -d "${OPENSSL_LIB_DIR}" ]; then
    LD_LIBRARY_PATH="${OPENSSL_LIB_DIR}"
    export LD_LIBRARY_PATH
  fi

  # start stud!
  msg_log "Starting instance '${INSTANCE_NAME}': ${STUD} ${opts}"
  out=`${prefix} ${STUD} ${opts} 2>&1`

  # remove lib path
  unset LD_LIBRARY_PATH

  # check invocation
  stud_pid=`echo "${out}" | tail -n 1 | cut -d " " -f5 | tr -d '.'`
  if [ -z "${stud_pid}" ]; then
     die "Empty stud pid. This is extremely weird."
  fi

  # wait a little bit, check if pid is still alive
  sleep 0.2 >/dev/null 2>&1
  if ! kill -0 "${stud_pid}" >/dev/null 2>&1; then
    die "Stud started successfully as pid ${stud_pid} but died shortly after startup.";
  fi

  # write pid file!
  pid_file_write "${INSTANCE_NAME}" "${stud_pid}" || msg_warn "${Error}"

  # set affinity!
  stud_affinity_set "${stud_pid}" || die "${Error}"
}

stud_single_instance_start() {
  name="${1}"
  if [ -z "${name}" ]; then
    Error="Unable to stop undefined stud instance."
    return 1
  fi

  # check if it is running
  if stud_single_instance_status "${name}"; then
    Error="Instance ${name} is already running as pid ${Error}."
    return 1
  fi

  # do the real stuff...
  Error=""
  out=`_real_single_instance_start 2>&1`
  rv=$?
  if [ "${rv}" != "0" ]; then
    Error="${out}"
    rv=1
  fi

  # this is it! :)
  return $rv
}

stud_single_instance_stop() {
  name="${1}"
  if [ -z "${name}" ]; then
    Error="Unable to stop undefined stud instance."
    return 1
  fi

  # check if it is running
  stud_single_instance_status "${name}" || return 1

  # time to stop instance
  pid="${Error}"
  msg_log "Stopping stud instance '${name}', pid ${pid}."

  ok=0
  if ! kill "${pid}" >/dev/null 2>&1; then
    Error="Unable to stop instance: unable to kill pid ${pid}."
    return 1
  fi

  # wait for termination
  i=0
  while [ ${i} -lt 9 ]; do
    i=$((i + 1))
    # are you dead yet?
    if ! kill -0 "${pid}" >/dev/null 2>&1; then
      ok=1
      break
    fi
    sleep 0.1 >/dev/null 2>&1
  done

  # not ok?! try to with headshot...
  if [ "${ok}" != "1" ]; then
    msg_log "Gentle stop of instance ${name} failed, trying to stop it with SIGKILL."
    if ! kill -9 "${pid}"; then
      Error="Unable to stop instance ${name}: kill(1) failed."
      return 1
    fi
  fi

  return 0
}

stud_single_instance_restart() {
  name="${1}"
  if [ -z "${name}" ]; then
    Error="Unable to stop undefined stud instance."
    return 1
  fi
  
  # maybe we need to stop it first...
  if stud_single_instance_status "${name}"; then
    stud_single_instance_stop "${name}" || return 1
  fi

  # start it back...
  Error=""
  stud_single_instance_start "${name}"
}

stud_single_instance_status() {
  Error=""
  if [ -z "${1}" ]; then
    Error="Invalid instance name."
    return 1
  fi

  # get pid file...
  pid=`pid_file_read "${1}"`

  # check it...
  if [ -z "${pid}" ] || ! kill -0 "${pid}" >/dev/null 2>&1; then
    Error="Instance '${1}' is stopped."
    return 1
  fi

  # set pid to Error
  Error="${pid}"
  return 0
}

# reads pid file of specific instance
pid_file_read() {
  test -z "${1}" && return 1
  file="${RUNTIME_DIR}/${1}.pid"
  test -f "${file}" -a -r "${file}" || return 1
  head -n 1 "${file}"
}

# writes pid file for specific instance
pid_file_write() {
  test -z "${1}" && return 1
  test -z "${2}" && return 1

  # check runtime directory
  if [ ! -e "${RUNTIME_DIR}" ] || [ ! -d "${RUNTIME_DIR}" ] || [ ! -w "${RUNTIME_DIR}" ]; then
    # try to create directory
    mkdir -p "${RUNTIME_DIR}" || die "Unable to create missing runtime directory '${RUNTIME_DIR}'"
  fi

  file="${RUNTIME_DIR}/${1}.pid"
  echo "${2}" > "${file}"
}

# lists running instances
running_instance_list() {
  list=""
  for file in ${RUNTIME_DIR}/*.pid; do
    test -f "${file}" || continue

    fileb=`basename "${file}"`
    name=`echo "${fileb}" | cut -d. -f1`
    if [ -z "${name}" ]; then
      msg_log "Removing bogus pid file '${file}'."
      rm -f "${file}" >/dev/null 2>&1
      continue
    fi
    pid=`pid_file_read "${name}"`
    if [ -z "${pid}" ]; then
      msg_log "Removing bogus pid file '${file}': instance '${name}' doesn't contain pid."
      rm -f "${file}" >/dev/null 2>&1
      continue
    fi

    # is this pid alive?
    if ! kill -0 "${pid}" >/dev/null 2>&1			; then
      msg_log "Removing bogus pid file '${file}': instance '${name}' [pid ${pid}] is stopped."
      rm -f "${file}" >/dev/null 2>&1
      continue
    fi

    list="${list} ${name}"
  done
  echo ${list}
}

stud_instances_start() {
  list="$@"
  if [ -z "${list}" ]; then
    list=`stud_config_instances_list`
  fi
  if [ -z "${list}" ]; then
    die "No stud instances configured in directory '${CONFIG_DIR}'."
  fi

  echo "Starting stud instances:"
  num_ok=0
  num_failed=0
  for instance in ${list}; do
    echo -n "  ${instance}: "
    # load configuration
    if ! stud_single_instance_config_load "${instance}"; then
      echo "failed: ${Error}"
      return 1
    # start instance
    elif stud_single_instance_start "${instance}"; then
      echo "done."
      msg_log "Instance ${name} successfully started."
      num_ok=$((num_ok + 1))
    else
      echo "failed: ${Error}"
      msg_err "Error starting instance ${name}: ${Error}"
      num_failed=$((num_failed + 1))
    fi
  done

  if [ "${num_failed}" != "0" ]; then
    return 1
  else
    return 0
  fi
}

stud_instances_stop() {
  list="$@"
  if [ -z "${list}" ]; then
    list=`running_instance_list`
  fi
  if [ -z "${list}" ]; then
    die "No stud instances are running."
  fi

  echo "Stopping stud instances:"
  num_ok=0
  num_failed=0
  for instance in ${list}; do
    echo -n "  ${instance}: "
    if stud_single_instance_stop "${instance}"; then
      echo "done."
      num_ok=$((num_ok + 1))
      msg_log "Instance ${instance} successfully stopped."
    else
      echo "failed: ${Error}"
      msg_err "Error stopping instance ${instance}: ${Error}"
      num_failed=$((num_failed + 1))
    fi
  done

  if [ "${num_failed}" != "0" ]; then
    return 1
  else
    return 0
  fi
}

stud_instances_restart() {
  list="$@"
  if [ -z "${list}" ]; then
    list=`(running_instance_list ; stud_config_instances_list) | tr ' ' '\n' | sort -u | xargs echo`
  fi

  echo "Restarting stud instances: "
  num_ok=0
  num_failed=0
  for instance in ${list}; do
    echo -n "  ${instance}: ";

    # load configuration
    if ! stud_single_instance_config_load "${instance}"; then
      echo "failed: ${Error}"
      return 1
    # restart instance
    elif stud_single_instance_restart "${instance}"; then
      echo "done."
      num_ok=$((num_ok + 1))
      msg_log "Instance ${instance} successfully restarted."
    else
      echo "failed: ${Error}"
      msg_err "Error restarting instance ${instance}: ${Error}"
      num_failed=$((num_failed + 1))
    fi
  done
    
  if [ "${num_failed}" != "0" ]; then
    return 1
  else
    return 0
  fi
}

stud_instances_status() {
  list_config=`stud_config_instances_list`
  list_running=`running_instance_list`

  list_all=`echo ${list_config} ${list_running} | tr ' ' '\n' | sort -u | xargs echo`

  i=0;

  echo "Stud instance status: "

  if [ -z "${list_all}" ]; then
    die "No instances are configured and/or running."
  fi

  for instance in ${list_all}; do
    echo -n "  ${instance}: "
    if stud_single_instance_status "${instance}"; then
      echo "running as pid $Error"
      i=$((i + 1))
    else
      echo "stopped"
    fi
  done

  if [ ${i} -gt 0 ]; then
    return 0
  else
    return 1
  fi
}

stud_config_instances_list() {
  list=""
  for file in ${CONFIG_DIR}/*.conf; do
    test -f "${file}" -a -r "${file}" || continue
    fileb=`basename "${file}"`
    name=`echo "${fileb}" | cut -d. -f1`
    test ! -z "${name}" || continue
    list="${list} ${name}"
  done

  echo ${list}
}

stud_single_instance_config_print() {
  head -n 151 "$0" | tail -n 123
}

stud_single_instance_config_load() {
  file="${CONFIG_DIR}/${1}.conf"
  INSTANCE_NAME=""

  # reset configuration
  stud_single_instance_config_reset
  Error=''

  if [ -f "${file}" -a -r "${file}" ]; then
    . "${file}" >/dev/null || Error="Unable to load instance configuration file '${file}'."
  else
    Error="Invalid or unreadable instance configuration file '${file}'."
    return 1
  fi

  # set instance name...
  INSTANCE_NAME="${1}"

  return 0
}

stud_instance_worker_pids() {
  test -z "${1}" && return 1
  ps -ef | grep  " ${1}  " | grep -v ' 1  ' | grep -v ' grep ' | awk '{print $2}' | xargs echo
}

# prints worker pid for n-th worker
# arguments:
#       $1:     list of worker pids (string)
#       $2:     worker number
stud_instance_worker_pid_by_num() {
  i=0
  local IFS=" "
  for e in ${1}; do
    i=$((i + 1))
    if [ "${i}" = "${2}" ]; then
      echo "$e"
      return 0
    fi
  done
  return 1
}

stud_affinity_set() {
  # nothing to set?
  test -z "$PROCESS_AFFINITY" && return 0

  Error=""

#   "1:0;2:3-4;3:5;4:7"  => bind first haproxy process to CPU0,
#                        second haproxy process to CPU3 and CPU4,
#                        third haproxy process to CPU5 and fourth
#                        process to CPU7


  worker_pids=`stud_instance_worker_pids "${1}"`

  local IFS=";"
  item=""
  for item in $PROCESS_AFFINITY; do
    num=`echo "${item}" | cut -f1 -d:`
    affinity=`echo "${item}" | cut -f2 -d:`

    # validate process number
    test -z "$num" && continue
    test ${num} -ge 1 2>&1 || continue

    # validate affinity
    test -z "${affinity}" && continue
    # WORKS:        OpenSUSE
    # DOESNT WORK:  Debian/Ubuntu!!!
    #echo "${affinity}" | grep -qPi '[^a-f0-9\-\,x]' && continue

    # is this raw affinity mask?
    raw_affinity=0
    echo "${affinity}" | grep -qE '^0x' && raw_affinity=1

    # get pid for process id $num
    pid=`stud_instance_worker_pid_by_num "${worker_pids}" "$num"`
    test -z "$pid" && continue

    #echo "item: $item; process num: $num; pid: $pid;  affinity: $affinity; raw: $raw_affinity"

    opt="-p"
    test "${raw_affinity}" = "0" && opt="${opt} -c"
    opt="${opt} ${affinity}"
    opt="${opt} ${pid}"
    # echo "WILL RUN: 'taskset $opt'"
    msg_log "Setting stud worker number ${num} (pid ${pid}) affinity using command: taskset ${opt}"
    eval taskset ${opt} >/dev/null 2>&1 || msg_log "Error setting process affinity."
  done
}

ulimit_n_set() {
  if [ -z "$ULIMIT_N" ] || [ "$ULIMIT_N" = "0" ]; then
    return 0
  fi

  # try to set maximum possible limit...
  i="$ULIMIT_N"
  num=0
  while [ $i -gt 0 ]; do
    num=$((num + 1))
    if ulimit -n "$i" > /dev/null 2>&1; then
      percentage=$((i*100 / ${ULIMIT_N}))
      if [ $percentage -lt 75 ]; then
        Error="Filedescriptor limit set to only $i (${percentage}% of desired value of $ULIMIT_N); check your system settings."
        return 1
      fi
      msg_log "Filedescriptor limit successfully set to $i (${percentage}% of desired value of $ULIMIT_N) after ${num} iteration(s)."
      return 0
      break
    else
      i=$((i - 100))
    fi
  done

  Error="Filedescriptor limit of $ULIMIT_N could not be set."
  msg_log "$Error"
  return 1
}

ulimit_set() {
  # set fd limit
  ulimit_n_set || return 1

  # set core file limit
  ulimit -c unlimited >/dev/null 2>&1

  return 0
}

printhelp() {
  cat <<EOF
Usage: ${MYNAME} {start|stop|restart|status|sample_instance_config} [name, name2, ...]

This is stud SSL offloader multi-instance init script.

OPTIONS:
  -C  --config-dir        Instance configuration directory (Default: "${CONFIG_DIR}")

                          This directory is searched for files matching *.conf
                          glob pattern; each file represents single stud instance
                          configuration file.

  -R  --runtime-dir       Runtime (pid file) directory (Default: "${RUNTIME_DIR}")

      --sample-config     Prints out default single instance configuration

  -V  --version           Prints script version
  -h  --help              This help message
EOF
}

# parse command line...
TEMP=`getopt -o C:R:Vh --long config-dir:,runtime-dir:,sample-config,version,help -n "$MYNAME" -- "$@"`
test "$?" != "0" && die "Invalid command line arguments. Run $MYNAME --help for instructions."
eval set -- "$TEMP"
while true; do
  case $1 in
    -C|--config-dir)
      CONFIG_DIR="${2}"
      shift 2
      ;;
    -R|--runtime-dir)
      RUNTIME_DIR="${2}"
      shift 2
      ;;
    --sample-config)
      stud_single_instance_config_print
      exit 0
      ;;
    -V|--version)
      echo "$MYNAME $VERSION"
      exit 0
      ;;
    -h|--help)
      printhelp
      exit 0
      ;;
    --)
      shift
      break
      ;;
    *)
      die "Invalid command line arguments. Run $MYNAME --help for instructions."
      ;;
  esac
done

# weed out real action and do something
case $1 in
  start)
    shift
    stud_instances_start "$@"
    ;;

  stop)
    shift
    stud_instances_stop "$@"
    ;;

  force-reload|restart)
    shift
    stud_instances_restart "$@"
    ;;

  status)
    stud_instances_status
    exit $?
    ;;

  sample_instance_config|instance_config)
    stud_single_instance_config_print
    exit 0
    ;;

  *)
    printhelp
    exit 1
  ;;
esac

# EOF