abb1a458a9
And update most of the comments to refer to "nftables" rather than "iptables" (even though it doesn't actually do any nftables updating at this point). For now the proxy also internally creates a utiliptablestesting.FakeIPTables to keep the existing sync code compiling.
94 lines
2.7 KiB
Go
94 lines
2.7 KiB
Go
/*
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Copyright 2023 Red Hat, Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package knftables
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import (
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"errors"
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"fmt"
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"os/exec"
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"strings"
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"syscall"
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)
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type nftablesError struct {
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wrapped error
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msg string
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errno syscall.Errno
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}
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// wrapError wraps an error resulting from running nft
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func wrapError(err error) error {
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nerr := &nftablesError{wrapped: err, msg: err.Error()}
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if ee, ok := err.(*exec.ExitError); ok {
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if len(ee.Stderr) > 0 {
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nerr.msg = string(ee.Stderr)
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eol := strings.Index(nerr.msg, "\n")
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// The nft binary does not call setlocale() and so will return
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// English error strings regardless of the locale.
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enoent := strings.Index(nerr.msg, "No such file or directory")
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eexist := strings.Index(nerr.msg, "File exists")
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if enoent != -1 && (enoent < eol || eol == -1) {
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nerr.errno = syscall.ENOENT
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} else if eexist != -1 && (eexist < eol || eol == -1) {
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nerr.errno = syscall.EEXIST
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}
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}
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}
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return nerr
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}
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// notFoundError returns an nftablesError with the given message for which IsNotFound will
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// return true.
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func notFoundError(format string, args ...interface{}) error {
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return &nftablesError{msg: fmt.Sprintf(format, args...), errno: syscall.ENOENT}
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}
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// existsError returns an nftablesError with the given message for which IsAlreadyExists
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// will return true.
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func existsError(format string, args ...interface{}) error {
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return &nftablesError{msg: fmt.Sprintf(format, args...), errno: syscall.EEXIST}
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}
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func (nerr *nftablesError) Error() string {
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return nerr.msg
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}
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func (nerr *nftablesError) Unwrap() error {
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return nerr.wrapped
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}
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// IsNotFound tests if err corresponds to an nftables "not found" error of any sort.
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// (e.g., in response to a "delete rule" command, this might indicate that the rule
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// doesn't exist, or the chain doesn't exist, or the table doesn't exist.)
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func IsNotFound(err error) bool {
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var nerr *nftablesError
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if errors.As(err, &nerr) {
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return nerr.errno == syscall.ENOENT
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}
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return false
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}
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// IsAlreadyExists tests if err corresponds to an nftables "already exists" error (e.g.
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// when doing a "create" rather than an "add").
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func IsAlreadyExists(err error) bool {
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var nerr *nftablesError
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if errors.As(err, &nerr) {
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return nerr.errno == syscall.EEXIST
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}
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return false
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}
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