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configuration.go
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configuration.go
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/*
* Copyright (c) 2020. Gaetan Crahay
*
* Use of this source code is governed by an MIT-style
* license that can be found in the LICENSE file or at
* https://opensource.org/licenses/MIT.
*/
package conf
import (
"encoding/json"
"encoding/xml"
"github.com/BurntSushi/toml"
"github.com/COSAE-FR/ripugw/collect"
"github.com/COSAE-FR/ripugw/inform"
"github.com/COSAE-FR/ripugw/pfconf"
log "github.com/sirupsen/logrus"
"io/ioutil"
"os"
"sync"
)
const (
defaultInformUrl = "http://unifi:8080/inform"
defaultInformInterval = 15
)
type Config struct {
General general `toml:"general" json:"general"`
Management Management `toml:"mgmt_cfg" json:"mgmt_cfg"`
PfSenseInterfaces *collect.PfSenseTranslationTable `toml:"pfsense_interfaces" json:"pfsense_interfaces"`
path string `toml:"-" json:"-"`
useJson bool `toml:"-" json:"-"`
Log *log.Entry `toml:"-" json:"-"`
PfSenseMode bool `toml:"-" json:"-"`
PfSense *pfconf.Configuration `toml:"-" json:"-"`
SpeedTest *inform.SpeedTestStatus `toml:"last_speedtest,omitempty" json:"last_speedtest,omitempty"`
Lock sync.Mutex `toml:"-" json:"-"`
}
type general struct {
Url string `toml:"url" json:"url"`
Adopted bool `toml:"adopted" json:"adopted"`
LogLevel string `toml:"log_level" json:"log_level"`
LogFile string `toml:"log_file" json:"log_file"`
PfSenseXml string `toml:"pfsense_xml" json:"pfsense_xml"`
InformInterval int `toml:"interval" json:"interval"`
LogFileWriter *os.File `toml:"-" json:"-"`
}
type Management struct {
Version string `toml:"configversion" json:"configversion"`
UseAesGcm bool `toml:"use_aes_gcm" json:"use_aes_gcm"`
Key string `toml:"authkey" json:"authkey"`
}
func (c *Config) Read() error {
if _, err := os.Stat(c.path); os.IsNotExist(err) {
return nil
} else if err != nil {
return err
}
if c.useJson {
return c.readJson()
} else {
return c.readToml()
}
}
func (c *Config) readToml() error {
if _, err := toml.DecodeFile(c.path, c); err != nil {
return err
}
return nil
}
func (c *Config) readJson() error {
jsonFile, err := os.Open(c.path)
if err != nil {
return err
}
defer jsonFile.Close()
byteValue, err := ioutil.ReadAll(jsonFile)
if err != nil {
return err
}
return json.Unmarshal(byteValue, c)
}
func (c *Config) Write() error {
c.Lock.Lock()
defer c.Lock.Unlock()
if c.useJson {
return c.writeJson()
} else {
return c.writeToml()
}
}
func (c *Config) writeToml() error {
f, err := os.Create(c.path)
if err != nil {
return err
}
if err := toml.NewEncoder(f).Encode(c); err != nil {
_ = f.Close()
return err
}
return f.Close()
}
func (c *Config) writeJson() error {
f, err := os.Create(c.path)
if err != nil {
return err
}
encoder := json.NewEncoder(f)
encoder.SetIndent("", "\t")
if err := encoder.Encode(c); err != nil {
_ = f.Close()
return err
}
return f.Close()
}
func (c *Config) setUpLog() {
if len(c.General.LogLevel) == 0 {
c.General.LogLevel = "error"
}
logLevel, err := log.ParseLevel(c.General.LogLevel)
if err != nil {
logLevel = log.ErrorLevel
}
log.SetLevel(logLevel)
logger := log.WithFields(log.Fields{
"app": "ripugw",
"component": "config_loader",
})
if len(c.General.LogFile) > 0 {
f, err := os.OpenFile(c.General.LogFile, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0644)
if err == nil {
c.General.LogFileWriter = f
log.SetOutput(f)
} else {
logger.Errorf("Cannot open log file %s. Logging to stderr.", c.General.LogFile)
}
} else {
c.General.LogFileWriter = os.Stderr
}
c.Log = logger
}
// fileExists checks if a file exists and is not a directory before we
// try using it to prevent further errors.
func fileExists(filename string) bool {
info, err := os.Stat(filename)
if os.IsNotExist(err) {
return false
}
return !info.IsDir()
}
func (c *Config) check() (changed bool, err error) {
logger := c.Log.WithField("component", "config_checker")
if len(c.General.Url) == 0 {
logger.Warnf("no inform URL in configuration file, default used: %s", defaultInformUrl)
c.General.Url = defaultInformUrl
changed = true
}
if c.General.InformInterval == 0 {
logger.Warnf("no inform interval in configuration file, default used: %d", defaultInformInterval)
c.General.InformInterval = defaultInformInterval
changed = true
}
if len(c.General.PfSenseXml) > 0 && fileExists(c.General.PfSenseXml) {
if len(c.PfSenseInterfaces.Wan) == 0 || len(c.PfSenseInterfaces.Lan) == 0 {
logger.Warn("no interface translation table between pfSense and physical interfaces")
} else {
xmlFile, err := os.Open(c.General.PfSenseXml)
// if we os.Open returns an error then handle it
if err != nil {
logger.Errorf("cannot open pfSense configuration file %s: %s", c.General.PfSenseXml, err)
} else {
logger.Info("Successfully opened pfSense configuration file")
// defer the closing of our xmlFile so that we can parse it later on
defer func() {
err = xmlFile.Close()
if err != nil {
logger.Errorf("cannot close pfSense configuration file: %s", c.General.PfSenseXml)
}
}()
byteValue, err := ioutil.ReadAll(xmlFile)
if err != nil {
logger.Errorf("cannot read pfSense configuration file %s: %s", c.General.PfSenseXml, err)
} else {
if err := xml.Unmarshal(byteValue, &c.PfSense); err != nil {
logger.Errorf("cannot parse pfSense configuration file %s: %s", c.General.PfSenseXml, err)
} else {
err := c.PfSense.Finalize()
if err != nil {
logger.Errorf("cannot finalize pfSense configuration: %v", err)
}
c.PfSenseMode = true
logger.Info("pfSense configuration valid: entering pfSense mode")
}
}
}
}
} else {
logger.Warn("no pfSense XML configuration file")
}
return changed, err
}
func (m Management) GetKey() inform.Key {
if len(m.Key) == 0 {
return inform.DefaultKey
}
keyBytes, err := inform.KeyFromString(m.Key)
if err != nil {
return inform.DefaultKey
}
return keyBytes
}
func (m Management) GetCryptoMode() int {
if m.UseAesGcm {
return inform.GCM
}
return inform.CBC
}
func New(path string, jsonFormat bool) (*Config, error) {
var config Config
config.path = path
if jsonFormat {
config.useJson = true
}
err := config.Read()
if err != nil {
return &config, err
}
config.setUpLog()
changed, err := config.check()
if err != nil && changed {
_ = config.Write()
}
return &config, err
}