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regexHandlers.go
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/
regexHandlers.go
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/*************************************************************************
* Copyright 2022 Gravwell, Inc. All rights reserved.
* Contact: <legal@gravwell.io>
*
* This software may be modified and distributed under the terms of the
* BSD 2-clause license. See the LICENSE file for details.
**************************************************************************/
package main
import (
"bufio"
"bytes"
"context"
"crypto/tls"
"fmt"
"io"
"net"
"os"
"regexp"
"strings"
"sync"
"time"
"github.com/gravwell/gravwell/v3/ingest"
"github.com/gravwell/gravwell/v3/ingest/config"
"github.com/gravwell/gravwell/v3/ingest/entry"
"github.com/gravwell/gravwell/v3/ingest/log"
"github.com/gravwell/gravwell/v3/ingest/processors"
"github.com/gravwell/gravwell/v3/timegrinder"
)
const (
DefaultMaxBuffer = 8 * 1024 * 1024 // Buffer up to 8 MB when looking for a regular expression.
)
type regexHandlerConfig struct {
name string
defTag entry.EntryTag
ignoreTimestamps bool
setLocalTime bool
timezoneOverride string
src net.IP
wg *sync.WaitGroup
formatOverride string
proc *processors.ProcessorSet
ctx context.Context
regex string
timeFormats config.CustomTimeFormat
trimWhitespace bool
maxBuffer int
}
func startRegexListeners(cfg *cfgType, igst *ingest.IngestMuxer, wg *sync.WaitGroup, f *flusher, ctx context.Context) error {
var err error
//short circuit out on empty
if len(cfg.RegexListener) == 0 {
return nil
}
for k, v := range cfg.RegexListener {
rhc := regexHandlerConfig{
name: k,
wg: wg,
ignoreTimestamps: v.Ignore_Timestamps,
setLocalTime: v.Assume_Local_Timezone,
timezoneOverride: v.Timezone_Override,
ctx: ctx,
formatOverride: v.Timestamp_Format_Override,
timeFormats: cfg.TimeFormat,
regex: v.Regex,
trimWhitespace: v.Trim_Whitespace,
maxBuffer: v.Max_Buffer,
}
if rhc.proc, err = cfg.Preprocessor.ProcessorSet(igst, v.Preprocessor); err != nil {
lg.Fatal("preprocessor error", log.KVErr(err))
}
f.Add(rhc.proc)
if _, err = regexp.Compile(v.Regex); err != nil {
return err
}
if v.Source_Override != `` {
rhc.src = net.ParseIP(v.Source_Override)
if rhc.src == nil {
return fmt.Errorf("RegexListener %v invalid source override \"%s\"", k, v.Source_Override)
}
} else if cfg.Source_Override != `` {
// global override
rhc.src = net.ParseIP(cfg.Source_Override)
if rhc.src == nil {
return fmt.Errorf("global source override \"%s\" is invalid", cfg.Source_Override)
}
}
//resolve default tag
if rhc.defTag, err = igst.GetTag(v.Tag_Name); err != nil {
return err
}
tp, str, err := translateBindType(v.Bind_String)
if err != nil {
lg.FatalCode(0, "invalid bind", log.KV("bindstring", v.Bind_String), log.KVErr(err))
}
if tp.TCP() {
//get the socket
addr, err := net.ResolveTCPAddr("tcp", str)
if err != nil {
return fmt.Errorf("%s Bind-String \"%s\" is invalid: %v\n", k, v.Bind_String, err)
}
l, err := net.ListenTCP("tcp", addr)
if err != nil {
return fmt.Errorf("%s Failed to listen on \"%s\": %v\n", k, addr, err)
}
connID := addConn(l)
//start the acceptor
wg.Add(1)
go regexAcceptor(l, connID, igst, rhc, tp)
} else if tp.TLS() {
config := &tls.Config{
MinVersion: tls.VersionTLS12,
}
config.Certificates = make([]tls.Certificate, 1)
config.Certificates[0], err = tls.LoadX509KeyPair(v.Cert_File, v.Key_File)
if err != nil {
lg.Fatal("failed to load certificate", log.KV("certfile", v.Cert_File), log.KV("keyfile", v.Key_File), log.KVErr(err))
}
//get the socket
addr, err := net.ResolveTCPAddr("tcp", str)
if err != nil {
lg.FatalCode(0, "invalid Bind-String", log.KV("bindstring", v.Bind_String), log.KV("regexlistener", k), log.KVErr(err))
}
l, err := tls.Listen("tcp", addr.String(), config)
if err != nil {
lg.FatalCode(0, "failed to listen via TLS", log.KV("address", addr), log.KV("regexlistener", k), log.KVErr(err))
}
connID := addConn(l)
//start the acceptor
wg.Add(1)
go regexAcceptor(l, connID, igst, rhc, tp)
} else if tp.UDP() {
addr, err := net.ResolveUDPAddr(`udp`, str)
if err != nil {
lg.FatalCode(0, "invalid Bind-String", log.KV("bindstring", v.Bind_String), log.KV("listener", k), log.KVErr(err))
}
l, err := net.ListenUDP(`udp`, addr)
if err != nil {
lg.FatalCode(0, "failed to listen via udp", log.KV("address", addr), log.KV("listener", k), log.KVErr(err))
}
connID := addConn(l)
wg.Add(1)
go regexAcceptorUDP(l, connID, rhc, igst)
}
}
debugout("Started %d regex listeners\n", len(cfg.RegexListener))
return nil
}
func regexAcceptor(lst net.Listener, id int, igst *ingest.IngestMuxer, cfg regexHandlerConfig, tp bindType) {
defer cfg.wg.Done()
defer delConn(id)
defer lst.Close()
var failCount int
for {
conn, err := lst.Accept()
if err != nil {
//i hate this... is there no damn error check that just says its closed or not?
if strings.Contains(err.Error(), "closed") {
break
}
failCount++
lg.Info("failed to accept connection", log.KV("readertype", `regex`), log.KV("mode", tp.String()), log.KVErr(err))
if failCount > 3 {
break
}
continue
}
debugout("Accepted %v connection from %s in regex mode\n", tp.String(), conn.RemoteAddr())
lg.Info("accepted connection", log.KV("address", conn.RemoteAddr()), log.KV("readertype", `regex`), log.KV("mode", tp), log.KV("listener", cfg.name))
failCount = 0
go regexConnHandler(conn, cfg, igst)
}
return
}
func regexAcceptorUDP(conn *net.UDPConn, id int, cfg regexHandlerConfig, igst *ingest.IngestMuxer) {
defer cfg.wg.Done()
defer delConn(id)
defer conn.Close()
buff := make([]byte, 16*1024) //local buffer that should be big enough for even the largest UDP packets
tcfg := timegrinder.Config{
EnableLeftMostSeed: true,
}
tg, err := timegrinder.NewTimeGrinder(tcfg)
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to get a handle on the timegrinder: %v\n", err)
return
} else if err = cfg.timeFormats.LoadFormats(tg); err != nil {
fmt.Fprintf(os.Stderr, "Failed to load custom time formats: %v\n", err)
return
}
if cfg.setLocalTime {
tg.SetLocalTime()
}
if cfg.timezoneOverride != `` {
err = tg.SetTimezone(cfg.timezoneOverride)
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to set timezone to %v: %v\n", cfg.timezoneOverride, err)
return
}
}
if cfg.formatOverride != `` {
if err = tg.SetFormatOverride(cfg.formatOverride); err != nil {
lg.Error("Failed to load format override", log.KV("override", cfg.formatOverride), log.KVErr(err))
return
}
}
regex, err := regexp.Compile(cfg.regex)
if err != nil {
// will never happen (we always check the regex first)
return
}
rs := regexState{
rx: regex,
prefixIndex: regex.SubexpIndex("prefix"),
suffixIndex: regex.SubexpIndex("suffix"),
}
if cfg.maxBuffer == 0 {
cfg.maxBuffer = DefaultMaxBuffer
}
for {
var rip net.IP
n, raddr, err := conn.ReadFromUDP(buff)
if err != nil {
break
}
if n == 0 {
continue
}
if raddr == nil {
continue
}
if n > len(buff) {
continue
}
if cfg.src == nil {
rip = raddr.IP
} else {
rip = cfg.src
}
regexLoop(bytes.NewReader(buff[:n]), cfg, rip, rs, tg)
}
}
func regexConnHandler(c net.Conn, cfg regexHandlerConfig, igst *ingest.IngestMuxer) {
cfg.wg.Add(1)
id := addConn(c)
defer cfg.wg.Done()
defer delConn(id)
defer c.Close()
var rip net.IP
if cfg.src == nil {
ipstr, _, err := net.SplitHostPort(c.RemoteAddr().String())
if err != nil {
lg.Error("failed to get host from remote addr", log.KV("remoteaddress", c.RemoteAddr().String()), log.KVErr(err))
return
}
if rip = net.ParseIP(ipstr); rip == nil {
lg.Error("failed to get remote address", log.KV("remoteaddress", ipstr))
return
}
} else {
rip = cfg.src
}
regex, err := regexp.Compile(cfg.regex)
if err != nil {
// will never happen (we always check the regex first)
return
}
rs := regexState{
rx: regex,
prefixIndex: regex.SubexpIndex("prefix"),
suffixIndex: regex.SubexpIndex("suffix"),
}
if cfg.maxBuffer == 0 {
cfg.maxBuffer = DefaultMaxBuffer
}
var tg *timegrinder.TimeGrinder
if !cfg.ignoreTimestamps {
var err error
tcfg := timegrinder.Config{
EnableLeftMostSeed: true,
}
tg, err = timegrinder.NewTimeGrinder(tcfg)
if err != nil {
lg.Error("failed to get a handle on the timegrinder", log.KVErr(err))
return
} else if err = cfg.timeFormats.LoadFormats(tg); err != nil {
lg.Error("failed to load custom time formats", log.KVErr(err))
return
}
if cfg.setLocalTime {
tg.SetLocalTime()
}
if cfg.timezoneOverride != `` {
err = tg.SetTimezone(cfg.timezoneOverride)
if err != nil {
lg.Error("failed to set timezone", log.KV("timezone", cfg.timezoneOverride), log.KVErr(err))
return
}
}
if cfg.formatOverride != `` {
if err = tg.SetFormatOverride(cfg.formatOverride); err != nil {
lg.Error("Failed to load format override", log.KV("override", cfg.formatOverride), log.KVErr(err))
return
}
}
}
regexLoop(c, cfg, rip, rs, tg)
}
type regexState struct {
rx *regexp.Regexp
prefixIndex int
suffixIndex int
}
func regexLoop(c io.Reader, cfg regexHandlerConfig, rip net.IP, rs regexState, tg *timegrinder.TimeGrinder) {
var ts entry.Timestamp
var err error
var ok bool
rd := make([]byte, 4096)
bio := bufio.NewReader(c)
var buf bytes.Buffer // we read from the connection into this buffer
var data []byte
var prefix, suffix []byte
var done bool
var n int
readerLoop:
for !done {
// we build the entry data into this buffer.
// make a new one on each loop so we're safe to call Bytes() at the end
// read a bunch of bytes off the connection
if n, err = bio.Read(rd); err != nil && err != io.EOF {
lg.Error("error reading from regex connection, ingesting partial entry and exiting", log.KVErr(err))
done = true
} else if err == io.EOF {
done = true
} else if n == 0 {
continue
}
if n > 0 {
buf.Write(rd[:n])
}
// now try and match the regex as many times as we can on whatever's in the buffer
for buf.Len() > 0 {
var entryData bytes.Buffer
entryData.Write(prefix)
b := buf.Bytes()
match := rs.rx.FindIndex(b)
// if there's no match, continue, *unless* we saw EOF in which case just send it
if match != nil {
// if there is a match, grab the bytes preceding it
entryData.Write(buf.Next(match[0]))
// read the actual contents of the match
contents := buf.Next(match[1] - match[0])
// see if there's any prefix/suffix stuff
parts := rs.rx.FindSubmatch(contents)
if rs.prefixIndex >= 0 && len(parts) >= rs.prefixIndex {
prefix = parts[rs.prefixIndex]
} else {
prefix = []byte{} // shouldn't happen
}
if rs.suffixIndex >= 0 && len(parts) >= rs.suffixIndex {
suffix = parts[rs.suffixIndex]
} else {
suffix = []byte{} // shouldn't happen
}
entryData.Write(suffix)
} else if done {
// there was no match, but we saw EOF, so we're going to write whatever we have
entryData.Write(buf.Bytes())
buf.Reset()
} else {
// no match, no EOF
// If we've exceeded the max buffer size, just write out the entry in progress. It's
// not very nice that way we don't discard data.
if buf.Len() > cfg.maxBuffer {
entryData.Write(buf.Next(cfg.maxBuffer))
} else {
break
}
}
// We might get here and find that there's no data in the buffer. For instance, if you're trying to match multi-line
// syslog messages by just matching on the priority + date part at the beginning, we're going to start out with an empty
// "entry" because the very first thing we see is the delimiter.
if entryData.Len() == 0 {
continue readerLoop
}
data = entryData.Bytes()
//get the timestamp
if !cfg.ignoreTimestamps {
var extracted time.Time
extracted, ok, err = tg.Extract(data)
if err != nil {
lg.Error("catastrophic timegrinder failure", log.KVErr(err))
return
} else if ok {
ts = entry.FromStandard(extracted)
}
}
if !ok {
ts = entry.Now()
}
if cfg.trimWhitespace {
data = bytes.TrimSpace(data)
}
ent := &entry.Entry{
SRC: cfg.src,
TS: ts,
Tag: cfg.defTag,
Data: data,
}
cfg.proc.ProcessContext(ent, cfg.ctx)
}
}
}