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|
#! /bin/sh
# Copyright 1999-2022 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
progname="$(basename "$0")"
T="$(getopt -o "h" --long "help,corecompress:,corerename:,crashemail:,dumpcore:,instance:,maxfd:,nicelevel:,restartdelay:,rundir:,syslog,tty:" -n "$progname" -- "$@")"
eval set -- "${T}"
# bash builtins are special ...
echo_e="$([ "${SHELL}" = "/bin/bash" ] && echo "echo -e" || echo echo)"
rundir=/run/asterisk
restartdelay=5
nicelevel=0
maxfd=4096
dumpcore=0
unset tty instance syslog corecompress corerename crashemail
usage() {
cat <<USAGE
USAGE: $progname [options] -- asterisk options"
OPTIONS:
-h|--help
Output this text and exit.
--corecompress[=tool]
asterisk's address space can get quite large, compressing the core dumps can
save significant space, especially if asterisk core dumps frequently.
--corerename pattern
It's assumed core files (if enabled) will go into PWD, this specifies a
rename pattern. The following % codes are recognised:
%h - hostname
%D - date in format YYYYMMDD
%T - time in format HHMMSS
It must be mentioned that if kernel.core_pattern (sysctl) is modified
from the default 'core' value this option is unlikely to work.
--crashemail email@address
This will send an email whenver asterisk crashes (does not terminate
cleanly with a zero exit code). You need a working sendmail binary.
--dumpcore sizelimit
Maximum size of core limit, or the word unlimited. Default is disabled
(sizelimit of 0).
--instance name
Updated label for sylog logger.
--maxfd maxfd
Sets the maximum number of file descriptors (default 4096).
--nicelevel nicelevel
Will set the asterisk nice level to the specified value.
--restartdelay delay_in_seconds
Number of seconds to wait before attempting to restart asterisk. This helps
to avoid tight-loop crashes. Defaults to 5s. Minimum 1.
--rundir path
Where to store the asterisk asterisk_wrapper.pid file. In order to terminate the
wrapper (when asterisk next terminates), remove this file.
--syslog
Pass to redirect output to syslog rather than using stdout and stderr.
--tty tty
If asterisk should be attached to a TTY device, then pass this, eg --tty /dev/tty8.
Use of this is not recommended in general.
NOTE: There are some quirks with bash getopt shunting non-options prior to --
to asterisk options, so be careful of this. Typically stuff will break.
USAGE
}
matchreg() {
local v=$1
shift
echo "$v" | grep -q "$@"
}
while [ "$1" != "--" ]; do
case "$1" in
--corecompress|--corerename|--crashemail|--dumpcore|--instance|--maxfd|--nicelevel|--restartdelay|--rundir|--tty)
eval "${1#--}=\"\${2}\""
shift 2
;;
--syslog)
eval "${1#--}=1"
shift
;;
--help|-h)
usage
exit 0
;;
*)
echo "BUG: Don't know how to process option $1." >&2
usage >&2
exit 1
;;
esac
done
shift # --
if ! matchreg "${restartdelay}" "^[1-9][0-9]*$"; then
echo "Invalid --restartdelay value ${restartdelay}, resetting to 5." >&2
restartdelay=5
fi
if ! matchreg "${maxfd}" "^[1-9][0-9]*$"; then
echo "Invalid --maxfd value, resetting to 4096." >&2
maxfd=4096
fi
if [ $maxfd -lt 1024 ]; then
echo "maxfd is guaranteed too low, bumping to at least 1024" >&2
maxfd=1024
fi
if [ -n "${nicelevel}" ] && ! matchreg "${nicelevel}" -E "^-?[0-9]+$"; then
echo "Invalid --nicelevel which much be a valid integer (values from -20 to 20 makes sense)."
exit 1
fi
if [ -n "${corecompress}" -a ! -x "${corecompress}" ]; then
corecompress=$(which "${corecompress}" 2>/dev/null)
[ -z "${corecompress}" ] && echo "Error locating core compression tool, disabling core compression." >&2
fi
# Before here will still be output (potentially munged, to the terminal).
if [ -n "${syslog}" ]; then
tdir="$(mktemp -d)"
tfifo="${tdir}/asterisk_wrapper.logger.fifo"
mkfifo "${tfifo}"
logger -t "asterisk_wrapper${instance:+:}${instance}" --id=$$ >/dev/null 2>&1 <"${tfifo}" &
exec 1>"${tfifo}"
exec 2>&1
rm "${tfifo}"
rmdir "${tdir}"
fi
echo "Initializing ${progname}"
cleanup(){
# There is a tiny race here, if this gets replaced inbetween the read and the rm.
# To fix this is quite complex in that we need to keep an fd, compare inode numbers
# and manage flock's.
[ -r "${rundir}/${progname}.pid" ] && \
[ "$(cat "${rundir}/${progname}.pid")" = $$ ] && \
rm "${rundir}/${progname}.pid"
}
trap cleanup EXIT
# We could be clobbering an old version's pid, in which case it'll just terminate on
# it's next iteration. Towards this end, if asterisk.pid exists, attempt to find it's
# config file and request a core stop when convenient so that we can take over.
echo $$ > "${rundir}/${progname}.pid"
if [ -r "${rundir}/asterisk.pid" ]; then
ast_pid="$(cat "${rundir}/asterisk.pid")"
[ -r "/proc/${ast_pid}/cmdline" ] && ast_conf="$(tr '\0' '\n' < "/proc/${ast_pid}/cmdline" | grep -A1 '^-C$' | tail -n1)" && /usr/sbin/asterisk -C "${ast_conf:-/etc/asterisk/asterisk.conf}" -rx "core stop when convenient"
# We may hit a few (depending on how busy the server is a great many number) loop failures still ...
fi
prlimit --core=${dumpcore} --pid=$$
prlimit --nofile=${maxfd} --pid=$$
ast_cmd=/usr/sbin/asterisk
if [ -n "${nicelevel}" ]; then
ast_cmd="nice -n ${nicelevel} ${ast_cmd}"
fi
while [ -r "${rundir}/${progname}.pid" ]; do
# Another instance is looking to replace us, so terminate.
if [ "$(cat "${rundir}/${progname}.pid")" != $$ ]; then
break
fi
echo "Starting asterisk with ${ast_cmd} $*"
if [ -n "${tty+yes}" ]; then
/bin/stty -F "${tty}" sane
${ast_cmd} "$@" >"${tty}" 2>&1 <"${tty}"
result=$?
else
# Purposefully leave stderr alone, this will under certain odd cases (like exceptions,
# and other odd cases logged from glibc) result in those logs at least being captured
# in syslog.
${ast_cmd} "$@" </dev/null >/dev/null
result=$?
fi
if [ "$result" -eq 0 ]; then
echo "Asterisk terminated normally."
break
fi
if [ "$result" -gt 128 ]; then
signal="$(( result - 128 ))"
signame="$(kill -l $signal 2>/dev/null)"
MSG="Asterisk terminated with Signal: $signal (SIG${signame:-???})"
# TODO: figure out how to use /proc/sys/kernel/core_pattern here, but if someone is using
# that, chances are they're already dealing with what we want here.
if [ -r core ]; then
if [ -n "${corerename+yes}" ]; then
core_target="$(echo "${core_pattern}" | sed -e "s/%h/$(hostname)/" \
-e "s/%D/$(date +%Y%m%d)/" -e "s/%T/$(date +%H%M%S)/")"
mv core "${core_target}"
core_target=$(readlink -f "${core_target}")
else
core_target=$(readlink -f core)
fi
if [ -n "${corecompress}" && -x "${corecompress}" ]; then
"${corecompress}" "${core_target}"
fi
MSG="${MSG}\r\nCore dumped: ${core_target}"
fi
else
MSG="Asterisk terminated with return code: $result"
fi
[ -n "${tty+yes}" ] \
&& echo "${MSG}" >"${tty}" \
|| echo "${MSG}"
if [ -n "${crashemail+yes}" && -x /usr/sbin/sendmail ]; then
$echo_e -n "Subject: Asterisk crashed\r\n${MSG}\r\n" |\
/usr/sbin/sendmail "${crashemail}"
fi
echo "Restarting asterisk after ${restartdelay}s ..."
sleep "${restartdelay}"
done
echo "Terminating $progname."
exit 0
|
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