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|
#!/usr/bin/env bash
# -*- tab-width: 4; sh-basic-offset: 4 -*-
# distcc-tool
# Copyright 2013 Luke Shumaker
#
# This file is part of Parabola.
#
# Parabola is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Parabola is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Parabola. If not, see <http://www.gnu.org/licenses/>.
# This program has very few dependencies:
# - bash: I don't know what version, I use fairly modern features
# - socat
# - cat: any version
# - rm: any version
# - sed: any version
# On Parabola, this means the packages:
# bash, coreutils, sed, socat
if ! type gettext &>/dev/null; then
gettext() { echo "$@"; }
fi
q0="$(printf '%q' "$0")" # quoted $0
panic() {
echo "$(gettext 'panic: malformed call to internal function')" >&2
exit 1
}
error() {
mesg="$(gettext "$1")"; shift
printf "$(gettext 'ERROR:') $mesg\n" "$@" >&2
exit 1
}
print() {
local mesg=$1
shift
printf -- "$(gettext "$mesg")\n" "$@"
}
usage() {
print "Usage: %s COMMAND [COMMAND-ARGS]" "$q0"
print "Tool for using distcc within a networkless chroot"
echo
print "Commands:"
print ' help print this message'
print ' odaemon CHROOTPATH daemon to run outside of the chroot'
print ' idaemon DISTCC_HOSTS daemon to run inside of the chroot'
print ' rewrite DISTCC_HOSTS prints a rewritten version of DISTCC_HOSTS'
print ' client HOST PORT connects stdio to TCP:$HOST:$PORT'
print 'Commands: for internal use'
print ' server counterpart to client; spawned by odaemon'
}
errusage() {
if [[ $# -gt 0 ]]; then
fmt="$(gettext "$1")"; shift
printf "$(gettext 'ERROR:') $fmt\n" "$@" >&2
fi
usage >&2
exit 1
}
main() {
local cmd=$1
shift
case "$cmd" in
help)
[[ $# -eq 0 ]] || errusage '%s: invalid number of arguments' "$cmd"
usage;;
odaemon|idaemon|rewrite)
[[ $# -eq 1 ]] || errusage '%s: invalid number of arguments' "$cmd"
$cmd "$@";;
client)
[[ $# -eq 2 ]] || errusage '%s: invalid number of arguments' "$cmd"
$cmd "$@";;
server)
[[ $# -eq 0 ]] || errusage '%s: invalid number of arguments' "$cmd"
$cmd "$@";;
*) errusage 'unknown subcommand: %s' "$cmd";;
esac
}
################################################################################
# DISTCC_HOSTS parser #
################################################################################
# usage: parse_DISTCC_HOSTS true|false DISTCC_HOSTS
# parses DISTCC_HOSTS and:
# $1==true : It sets up port forwarding for inside the choot, sleep forever
# $1==false: Prints a modified version of DISTCC_HOSTS that uses the forwarded
# ports that were set up when $1==true.
parse_DISTCC_HOSTS() {
{ [[ $# -eq 2 ]] && { [[ $1 == true ]] || [[ $1 == false ]]; }; } || panic
local forward_ports=$1
local DISTCC_HOSTS=$2
local pids=() # child pids
local newhosts=()
local newport=8000 # next port to be used for port forwarding
# This is based on the grammar specified in distcc(1)
local HOSTSPEC
for HOSTSPEC in $(sed 's/#.*//' <<<"$DISTCC_HOSTS"); do
case "$HOSTSPEC" in
# LOCAL_HOST
localhost|localhost/*|--localslots=*|--localslots_cpp=*)
# "localhost" runs commands directly, not talking to distccd at
# localhost, use an IP or real hostname for that.
# So, just pass these through.
newhosts+=("$HOSTSPEC")
;;
# SSH_HOST
*@*)
# SSH_HOST doesn't allow custom port numbers, and even if it
# did, ssh would complain about MITM. Instead, we'll count on
# ssh ProxyCommand being configured to use `client`.
newhosts+=("$HOSTSPEC")
;;
# GLOBAL_OPTION
--*)
# pass these through
newhosts+=("$HOSTSPEC")
;;
# ZEROCONF
+zeroconf)
error "%s does not support the +zeroconf option" "$q0"
exit 1
;;
# TCP_HOST or OLDSTYLE_TCP_HOST
*)
declare HOSTID= PORT= LIMIT= OPTIONS=
if [[ $HOSTSPEC =~ ^([^:/]+)(:([0-9]+))?(/([0-9]+))?(,.*)?$ ]]; then
# TCP_HOST
HOSTID=${BASH_REMATCH[1]}
PORT=${BASH_REMATCH[3]}
LIMIT=${BASH_REMATCH[5]}
OPTIONS=${BASH_REMATCH[6]}
elif [[ $HOSTSPEC =~ ^([^:/]+)(/([0-9]+))?(:([0-9]+))?(,.*)?$ ]]; then
# OLDSTYLE_TCP_HOST
HOSTID=${BASH_REMATCH[1]}
LIMIT=${BASH_REMATCH[3]}
PORT=${BASH_REMATCH[5]}
OPTIONS=${BASH_REMATCH[6]}
else
error "Could not parse HOSTSPEC: %s" "$HOSTSPEC"
fi
# set up port forwaring
if $forward_ports; then
socat TCP-LISTEN:${newport},fork SYSTEM:"$q0 client $HOSTID ${PORT:-3632}" &
pids+=($!)
fi
# add the forwarded port
local newhost="127.0.0.1:$newport"
[[ -z $LIMIT ]] || newhost+="/$LIMIT"
[[ -z $OPTIONS ]] || newhost+="$OPTIONS"
newhosts+=("$newhost")
: $((newport++))
;;
esac
done
if $forward_ports; then
if [[ -z "${pids[*]}" ]]; then
# listen on port 8000, but immediatly close, just so that we are
# listening on something
socat TCP-LISTEN:${newport},fork SYSTEM:true &
pids+=($!)
fi
trap "kill -- ${pids[*]}" EXIT
wait "${pids[@]}"
else
printf '%s\n' "${newhosts[*]}"
fi
}
################################################################################
# Port forwarding primitives #
################################################################################
# Usage: server
# Reads "host port" from the first line of stdin, then connects stdio to the
# specified TCP socket.
server() {
[[ $# -eq 0 ]] || panic
while read -r host port; do
socat STDIO TCP:"$host:$port"
break
done
}
# Usage: client HOST PORT
# For usage inside of a chroot. It talks through the UNIX-domain socket to an
# instance of `server` outside, in order to connect stdio to the specified TCP
# socket.
client() {
[[ $# -eq 2 ]] || panic
local file=/socket
{ printf '%s\n' "$*"; cat; } | socat UNIX-CONNECT:"$file" STDIO
}
################################################################################
# High-level routines #
################################################################################
# Usage: odaemon CHROOTPATH
# Listens on "$CHROOTPATH/socket" and spawns a `server` for each new connection.
odaemon() {
[[ $# -eq 1 ]] || panic
local chrootpath=$1
umask 111
socat UNIX-LISTEN:"$chrootpath/socket",fork SYSTEM:"$q0 server" &
trap "kill -- $!; rm -f -- $(printf '%q' "$chrootpath/socket")" EXIT
wait
}
# Usage: idaemon DISTCC_HOSTS
# Sets things up inside of the chroot to forward distcc hosts out.
idaemon() {
[[ $# -eq 1 ]] || panic
parse_DISTCC_HOSTS true "$1"
}
# Usage: rewrite DISTCC_HOSTS
# Prints a modified version of DISTCC_HOSTS for inside the chroot.
rewrite() {
[[ $# -eq 1 ]] || panic
parse_DISTCC_HOSTS false "$1"
}
main "$@"
|
