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match.go
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match.go
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package gerberos
import (
"errors"
"fmt"
"log"
"net"
"strings"
"time"
"github.com/admpub/regexp2"
)
type Match struct {
Time time.Time
Line string
IP string
IPv6 bool
Regexp *regexp2.Regexp
}
func (r *Rule) MatchSimple(line string) (*Match, error) {
for _, re := range r.regexp {
mch, err := re.FindStringMatch(line)
if err != nil {
return nil, err
}
if mch == nil {
continue
}
g := mch.GroupByName("ip")
if g == nil {
continue
}
h := g.String()
h = strings.Trim(h, "[]")
ph := net.ParseIP(h)
if ph == nil {
return nil, fmt.Errorf(`failed to parse matched IP "%s"`, h)
}
return &Match{
Line: line,
Time: time.Now(),
IP: h,
IPv6: ph.To4() == nil,
Regexp: re,
}, nil
}
return nil, fmt.Errorf(`line "%s" does not match any regexp`, line)
}
func (r *Rule) MatchAggregate(line string) (*Match, error) {
a := r.aggregate
for _, re := range a.regexp {
mch, err := re.FindStringMatch(line)
if err != nil {
return nil, err
}
if mch == nil {
continue
}
g := mch.GroupByName("id")
if g == nil {
continue
}
id := g.String()
a.registryMutex.Lock()
if ip, e := a.registry[id]; e {
delete(a.registry, id)
a.registryMutex.Unlock()
return &Match{
Line: line,
Time: time.Now(),
IP: ip.String(),
IPv6: ip.To4() == nil,
Regexp: re,
}, nil
}
a.registryMutex.Unlock()
}
for _, re := range r.regexp {
mch, err := re.FindStringMatch(line)
if err != nil {
return nil, err
}
if mch == nil {
continue
}
g := mch.GroupByName("ip")
if g == nil {
continue
}
h := g.String()
h = strings.Trim(h, "[]")
pip := net.ParseIP(h)
if pip == nil {
return nil, fmt.Errorf(`failed to parse matched IP "%s"`, h)
}
g = mch.GroupByName("id")
if g == nil {
return nil, fmt.Errorf(`failed to match ID`)
}
id := g.String()
if id == "" {
return nil, fmt.Errorf(`failed to match ID`)
}
a.registryMutex.Lock()
a.registry[id] = pip
if r.runner.Configuration.Verbose {
log.Printf(`%s: added ID "%s" with IP %s to registry`, r.name, id, pip)
}
a.registryMutex.Unlock()
go func(id string) {
time.Sleep(a.interval)
a.registryMutex.Lock()
if ip, e := a.registry[id]; e {
delete(a.registry, id)
if r.runner.Configuration.Verbose {
log.Printf(`%s: removed ID "%s" with IP %s from registry`, r.name, id, ip)
}
}
a.registryMutex.Unlock()
}(id)
return nil, errors.New("incomplete aggregate")
}
return nil, fmt.Errorf(`line "%s" does not match any regexp`, line)
}
func (r *Rule) Match(line string) (*Match, error) {
if r.aggregate != nil {
return r.MatchAggregate(line)
}
return r.MatchSimple(line)
}
func (m Match) stringSimple() string {
ipv := "IPv4"
if m.IPv6 {
ipv = "IPv6"
}
return fmt.Sprintf(`time = %s, IP = "%s", %s`, m.Time.Format(time.RFC3339), m.IP, ipv)
}
func (m Match) StringExtended() string {
return fmt.Sprintf(`%s, line = "%s", regexp = "%s"`, m, m.Line, m.Regexp)
}
func (m Match) String() string {
return m.stringSimple()
}