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# -*-eselect-*- vim: ft=eselect
# Copyright 2005-2020 Gentoo Authors
# Distributed under the terms of the GNU GPL version 2 or later
inherit package-manager
DESCRIPTION="Manage the iptables/arptables/ebtables symlinks"
MAINTAINER="base-system@gentoo.org"
VERSION="20200508"
# a simple list of symlinks does for iptables
IPTABLES_SYMLINKS=(
"iptables-xml"
"iptables" "iptables-restore" "iptables-save"
)
IP6TABLES_SYMLINKS=(
"ip6tables" "ip6tables-restore" "ip6tables-save"
)
# for arptables and ebtables we map names to legacy targets
ARPTABLES_TARGETS=(
"arptables-legacy"
"xtables-nft-multi"
)
declare -A ARPTABLES_SYMLINKS=(
[arptables]="arptables-legacy"
[arptables-restore]="arptables-legacy-restore"
[arptables-save]="arptables-legacy-save"
)
EBTABLES_TARGETS=(
"ebtables-legacy"
"xtables-nft-multi"
)
declare -A EBTABLES_SYMLINKS=(
[ebtables]="ebtables-legacy"
[ebtables-restore]="ebtables-legacy-restore"
[ebtables-save]="ebtables-legacy-save"
)
# get which module is running
get_module() {
local module
module="${BASH_SOURCE[0]##*/}"
printf -- '%s\n' "${module%.eselect}"
}
# find a list of symlink targets for the current module
find_targets() {
local module target
module="$(get_module)"
case "${module}" in
iptables)
for target in "${EROOT}"/sbin/xtables-*-multi; do
[[ -x ${target} ]] && printf -- '%s\n' "${target##*/}"
done
;;
arptables)
for target in "${ARPTABLES_TARGETS[@]}"; do
[[ -x ${EROOT}/sbin/${target} ]] && printf -- '%s\n' "${target}"
done
;;
ebtables)
for target in "${EBTABLES_TARGETS[@]}"; do
[[ -x ${EROOT}/sbin/${target} ]] && printf -- '%s\n' "${target}"
done
;;
*) die "Invalid module name ${module}"
esac
}
# get the list of symlinks for the current module
get_symlinks_list() {
local module
module="$(get_module)"
case "${module}" in
iptables)
printf -- '%s\n' "${IPTABLES_SYMLINKS[@]}"
if [[ ${1} == -a ]] || has_version 'net-firewall/iptables[ipv6]'
then
printf -- '%s\n' "${IP6TABLES_SYMLINKS[@]}"
fi
;;
arptables) printf -- '%s\n' "${!ARPTABLES_SYMLINKS[@]}";;
ebtables) printf -- '%s\n' "${!EBTABLES_SYMLINKS[@]}";;
*) die "Invalid module name ${module}"
esac
}
# get the symlink target given a symlink name and the target implementation
get_symlink_target() {
local link="${1}" target="${2}" module
module="$(get_module)"
case "${module}" in
iptables) printf -- '%s\n' "${target}";;
arptables)
if [[ ${target} == *-legacy ]]; then
printf -- '%s\n' "${ARPTABLES_SYMLINKS[${link}]}"
else
printf -- '%s\n' "${target}"
fi
;;
ebtables)
if [[ ${target} == *-legacy ]]; then
printf -- '%s\n' "${EBTABLES_SYMLINKS[${link}]}"
else
printf -- '%s\n' "${target}"
fi
;;
*) die "Invalid module name ${module}"
esac
}
# set the symlinks for the current target
set_symlinks() {
local target="${1}"
local retval=0
if is_number "${target}" && [[ ${target} -ge 1 ]]; then
local -a targets
readarray -t targets < <(find_targets)
target=${targets[$((target-1))]}
fi
if [[ -z ${target} || ! -f ${EROOT}/sbin/${target} ]]; then
die -q "Target \"${target}\" doesn't appear to be valid!"
fi
# create an array of symlinks to be created, then create them
# in a separate pass, it's done this way in an attempt to be atomic
# either all symlinks get updated, or none
local -a symlinks_list
readarray -t symlinks_list < <(get_symlinks_list)
local symlink
local -A do_symlinks
for symlink in "${symlinks_list[@]}"; do
local symlink_path="${EROOT}/sbin/${symlink}"
if [[ -L ${symlink_path} || ! -e ${symlink_path} ]]; then
do_symlinks["${symlink_path}"]="$(get_symlink_target "${symlink}" "${target}")"
else
die -q "Could not create symlink at ${symlink_path}:" \
"path exits and is not a symlink"
fi
done
for symlink in "${!do_symlinks[@]}"; do
if ! ln -sfn "${do_symlinks["${symlink}"]}" "${symlink}"; then
write_error_message "Failed to create symlink at ${symlink}"
retval=1
fi
done
return "${retval}"
}
### show action ###
describe_show() {
printf -- 'Show the current %s symlink\n' "$(get_module)"
}
do_show() {
local -a symlinks_list
readarray -t symlinks_list < <(get_symlinks_list)
local all_unset=1 symlink
write_list_start "Current $(get_module) symlinks:"
for symlink in "${symlinks_list[@]}"; do
symlink_path="${EROOT}/sbin/${symlink}"
if [[ -L ${symlink_path} ]]; then
local symlink_target
symlink_target=$(canonicalise "${symlink_path}")
write_kv_list_entry "${symlink}" "${symlink_target%/}"
all_unset=0
elif [[ ! -f ${symlink_path} ]]; then
write_kv_list_entry "${symlink}" "(unset)"
fi
done
return "${all_unset}"
}
### list action ###
describe_list() {
printf -- 'List available %s symlink targets\n' "$(get_module)"
}
do_list() {
local module
module="$(get_module)"
local -a targets_list symlinks_list
readarray -t targets_list < <(find_targets)
readarray -t symlinks_list < <(get_symlinks_list)
local -a targets_output
write_list_start "Available ${module} symlink targets:"
local symlink current_target
for symlink in "${symlinks_list[@]}"; do
local symlink_path="${EROOT}/sbin/${symlink}"
local target
for target in "${targets_list[@]}"; do
local symlink_target resolved_target
symlink_target="$(get_symlink_target "${symlink}" "${target}")"
resolved_target="$(basename "$(canonicalise "${symlink_path}")")"
if [[ ${resolved_target} == "${symlink_target}" ]]; then
if [[ -z ${current_target} ]]; then
current_target="${target}"
break
elif [[ ${current_target} != "${target}" ]]; then
write_warning_msg "Target mismatch"
unset current_target
break 2
fi
fi
done
done
for target in "${targets_list[@]}"; do
if [[ ${target} == "${current_target}" ]]; then
targets_output+=("$(highlight_marker "${target}")")
else
targets_output+=("${target}")
fi
done
write_numbered_list -m "(none found)" "${targets_output[@]}"
}
### set action ###
describe_set() {
printf "Set a new $(get_module) symlink target\\n"
}
describe_set_options() {
printf -- "target : Target name or number (from 'list' action)\\n"
}
do_set() {
local target="${1}"
[[ -z ${target} ]] && die -q "You didn't tell me what to set the symlink to"
[[ ${#} -gt 1 ]] && die -q "Too many parameters"
set_symlinks "${target}" || die -q "Couldn't set symlinks"
}
### unset action ###
describe_unset() {
printf -- 'Unset %s symlink targets\n' "$(get_module)"
}
do_unset() {
local retval=0
local -a symlinks_list
readarray -t symlinks_list < <(get_symlinks_list -a)
local symlink
for symlink in "${symlinks_list[@]}"; do
local symlink_path="${EROOT}/sbin/${symlink}"
if [[ -L ${symlink_path} ]]; then
unlink "${symlink_path}" || retval=${?}
elif [[ -e ${symlink_path} ]]; then
write_error_msg "Not removing non-symlink \"${symlink_path}\""
retval=1
fi
done
return ${retval}
}
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