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// SPDX-License-Identifier: GPL-3.0-or-later
package config
import (
"bufio"
"errors"
"fmt"
"os"
"path/filepath"
"runtime"
"strings"
)
type option struct{ name, value string }
const (
optInclude = "include"
optIncludeToplevel = "include-toplevel"
optCumulative = "statistics-cumulative"
optEnable = "control-enable"
optInterface = "control-interface"
optPort = "control-port"
optUseCert = "control-use-cert"
optKeyFile = "control-key-file"
optCertFile = "control-cert-file"
)
func isOptionUsed(opt option) bool {
switch opt.name {
case optInclude,
optIncludeToplevel,
optCumulative,
optEnable,
optInterface,
optPort,
optUseCert,
optKeyFile,
optCertFile:
return true
}
return false
}
// TODO:
// If also using chroot, using full path names for the included files works, relative pathnames for the included names
// work if the directory where the daemon is started equals its chroot/working directory or is specified before
// the include statement with directory: dir.
// Parse parses Unbound configuration files into UnboundConfig.
// It follows logic described in the 'man unbound.conf':
// - Files can be included using the 'include:' directive. It can appear anywhere, it accepts a single file name as argument.
// - Processing continues as if the text from the included file was copied into the config file at that point.
// - Wildcards can be used to include multiple files.
//
// It stops processing on any error: syntax error, recursive include, glob matches directory etc.
func Parse(entryPath string) (*UnboundConfig, error) {
options, err := parse(entryPath, nil)
if err != nil {
return nil, err
}
return fromOptions(options), nil
}
func parse(filename string, visited map[string]bool) ([]option, error) {
if visited == nil {
visited = make(map[string]bool)
}
if visited[filename] {
return nil, fmt.Errorf("'%s' already visited", filename)
}
visited[filename] = true
f, err := open(filename)
if err != nil {
return nil, err
}
defer func() { _ = f.Close() }()
var options []option
sc := bufio.NewScanner(f)
for sc.Scan() {
line := strings.TrimSpace(sc.Text())
if line == "" || strings.HasPrefix(line, "#") {
continue
}
opt, err := parseLine(line)
if err != nil {
return nil, fmt.Errorf("file '%s', error on parsing line '%s': %v", filename, line, err)
}
if !isOptionUsed(opt) {
continue
}
if opt.name != optInclude && opt.name != optIncludeToplevel {
options = append(options, opt)
continue
}
filenames, err := globInclude(opt.value)
if err != nil {
return nil, err
}
for _, name := range filenames {
opts, err := parse(name, visited)
if err != nil {
return nil, err
}
options = append(options, opts...)
}
}
return options, nil
}
func globInclude(include string) ([]string, error) {
if isGlobPattern(include) {
return filepath.Glob(include)
}
return []string{include}, nil
}
func parseLine(line string) (option, error) {
parts := strings.Split(line, ":")
if len(parts) < 2 {
return option{}, errors.New("bad syntax")
}
key, value := cleanKeyValue(parts[0], parts[1])
return option{name: key, value: value}, nil
}
func cleanKeyValue(key, value string) (string, string) {
if i := strings.IndexByte(value, '#'); i > 0 {
value = value[:i-1]
}
key = strings.TrimSpace(key)
value = strings.Trim(strings.TrimSpace(value), "\"'")
return key, value
}
func isGlobPattern(value string) bool {
magicChars := `*?[`
if runtime.GOOS != "windows" {
magicChars = `*?[\`
}
return strings.ContainsAny(value, magicChars)
}
func open(filename string) (*os.File, error) {
f, err := os.Open(filename)
if err != nil {
return nil, err
}
fi, err := f.Stat()
if err != nil {
return nil, err
}
if !fi.Mode().IsRegular() {
return nil, fmt.Errorf("'%s' is not a regular file", filename)
}
return f, nil
}
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