core-agent-linux/qrexec/qubes-rpc-multiplexer
2016-03-27 04:30:44 +02:00

48 lines
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#!/bin/sh
# write stderr to both calling party and local log; be very careful about
# closing file descriptors here - if either stdout or stderr will not be closed
# when service process does the same - service call will hang (waiting for EOF
# on stdout/stderr)
stderr_pipe=/tmp/qrexec-rpc-stderr.$$
mkfifo $stderr_pipe
# tee can't write to file descriptor, nor /proc/self/fd/2 (EXIO on open)
return_stderr_pipe=/tmp/qrexec-rpc-stderr-return.$$
mkfifo $return_stderr_pipe
{ cat <$return_stderr_pipe >&2 2>/dev/null; rm -f $return_stderr_pipe; } &
{ tee $return_stderr_pipe 2>/dev/null <$stderr_pipe |\
logger -t "$1-$2" >/dev/null 2>&1; rm -f $stderr_pipe; } &
exec 2>$stderr_pipe
QUBES_RPC=/etc/qubes-rpc
LOCAL_QUBES_RPC=/usr/local/etc/qubes-rpc
if ! [ $# = 2 ] ; then
echo $0: bad argument count, usage: $0 SERVICE-NAME REMOTE-DOMAIN-NAME >&2
exit 1
fi
export QREXEC_REMOTE_DOMAIN="$2"
export QREXEC_SERVICE_FULL_NAME="$1"
SERVICE_WITHOUT_ARGUMENT="${1%%+*}"
if [ "${QREXEC_SERVICE_FULL_NAME}" != "${SERVICE_WITHOUT_ARGUMENT}" ]; then
export QREXEC_SERVICE_ARGUMENT="${QREXEC_SERVICE_FULL_NAME#*+}"
fi
for CFG_FILE in $LOCAL_QUBES_RPC/"$1" $QUBES_RPC/"$1" \
$LOCAL_QUBES_RPC/"${SERVICE_WITHOUT_ARGUMENT}" \
$QUBES_RPC/"${SERVICE_WITHOUT_ARGUMENT}"; do
if [ -s "$CFG_FILE" ]; then
break
fi
done
if [ -x "$CFG_FILE" ] ; then
exec "$CFG_FILE" ${QREXEC_SERVICE_ARGUMENT}
echo "$0: failed to execute handler for" "$1" >&2
exit 1
else
exec /bin/sh -- "$CFG_FILE" ${QREXEC_SERVICE_ARGUMENT}
echo "$0: failed to execute handler for" "$1" >&2
exit 1
fi