93 lines
2.0 KiB
Go
93 lines
2.0 KiB
Go
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package main
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import (
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"errors"
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"fmt"
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"net"
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"os"
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"sync"
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"time"
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"github.com/jedisct1/dlog"
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"github.com/miekg/dns"
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)
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type PluginNxLog struct {
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sync.Mutex
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outFd *os.File
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format string
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}
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func (plugin *PluginNxLog) Name() string {
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return "nx_log"
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}
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func (plugin *PluginNxLog) Description() string {
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return "Log DNS queries for nonexistent zones."
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}
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func (plugin *PluginNxLog) Init(proxy *Proxy) error {
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plugin.Lock()
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defer plugin.Unlock()
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outFd, err := os.OpenFile(proxy.nxLogFile, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0644)
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if err != nil {
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return err
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}
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plugin.outFd = outFd
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plugin.format = proxy.nxLogFormat
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return nil
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}
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func (plugin *PluginNxLog) Drop() error {
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return nil
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}
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func (plugin *PluginNxLog) Reload() error {
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return nil
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}
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func (plugin *PluginNxLog) Eval(pluginsState *PluginsState, msg *dns.Msg) error {
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if msg.Rcode != dns.RcodeNameError {
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return nil
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}
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questions := msg.Question
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if len(questions) == 0 {
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return nil
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}
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question := questions[0]
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qType, ok := dns.TypeToString[question.Qtype]
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if !ok {
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qType = string(qType)
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}
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var clientIPStr string
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if pluginsState.clientProto == "udp" {
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clientIPStr = (*pluginsState.clientAddr).(*net.UDPAddr).IP.String()
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} else {
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clientIPStr = (*pluginsState.clientAddr).(*net.TCPAddr).IP.String()
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}
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qName := StripTrailingDot(question.Name)
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var line string
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if plugin.format == "tsv" {
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now := time.Now()
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year, month, day := now.Date()
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hour, minute, second := now.Clock()
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tsStr := fmt.Sprintf("[%d-%02d-%02d %02d:%02d:%02d]", year, int(month), day, hour, minute, second)
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line = fmt.Sprintf("%s\t%s\t%s\t%s\n", tsStr, clientIPStr, StringQuote(qName), qType)
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} else if plugin.format == "ltsv" {
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line = fmt.Sprintf("time:%d\thost:%s\tmessage:%s\ttype:%s\n",
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time.Now().Unix(), clientIPStr, StringQuote(qName), qType)
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} else {
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dlog.Fatalf("Unexpected log format: [%s]", plugin.format)
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}
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plugin.Lock()
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if plugin.outFd == nil {
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return errors.New("Log file not initialized")
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}
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plugin.outFd.WriteString(line)
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defer plugin.Unlock()
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return nil
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}
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