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add dns.spoof.ttl env variable

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buffermet 2020-03-05 08:34:45 +10:00 • committed by GitHub
commit e4682168df
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1 changed files with 18 additions and 1 deletions
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19
modules/dns_spoof/dns_spoof.go
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@ -4,6 +4,7 @@ import (
"bytes" "bytes"
"fmt" "fmt"
"net" "net"
"strconv"
"sync" "sync"
"github.com/bettercap/bettercap/packets" "github.com/bettercap/bettercap/packets"
@ -20,6 +21,7 @@ type DNSSpoofer struct {
session.SessionModule session.SessionModule
Handle *pcap.Handle Handle *pcap.Handle
Hosts Hosts Hosts Hosts
TTL uint32
All bool All bool
waitGroup *sync.WaitGroup waitGroup *sync.WaitGroup
pktSourceChan chan gopacket.Packet pktSourceChan chan gopacket.Packet
@ -31,6 +33,7 @@ func NewDNSSpoofer(s *session.Session) *DNSSpoofer {
Handle: nil, Handle: nil,
All: false, All: false,
Hosts: Hosts{}, Hosts: Hosts{},
TTL: 1024,
waitGroup: &sync.WaitGroup{}, waitGroup: &sync.WaitGroup{},
} }
@ -55,6 +58,11 @@ func NewDNSSpoofer(s *session.Session) *DNSSpoofer {
"false", "false",
"If true the module will reply to every DNS request, otherwise it will only reply to the one targeting the local pc.")) "If true the module will reply to every DNS request, otherwise it will only reply to the one targeting the local pc."))
mod.AddParam(session.NewStringParameter("dns.spoof.ttl",
"1024",
"^[0-9]+$",
"TTL of spoofed DNS replies in seconds."))
mod.AddHandler(session.NewModuleHandler("dns.spoof on", "", mod.AddHandler(session.NewModuleHandler("dns.spoof on", "",
"Start the DNS spoofer in the background.", "Start the DNS spoofer in the background.",
func(args []string) error { func(args []string) error {
@ -84,6 +92,7 @@ func (mod DNSSpoofer) Author() string {
func (mod *DNSSpoofer) Configure() error { func (mod *DNSSpoofer) Configure() error {
var err error var err error
var ttl string
var hostsFile string var hostsFile string
var domains []string var domains []string
var address net.IP var address net.IP
@ -102,6 +111,8 @@ func (mod *DNSSpoofer) Configure() error {
return err return err
} else if err, hostsFile = mod.StringParam("dns.spoof.hosts"); err != nil { } else if err, hostsFile = mod.StringParam("dns.spoof.hosts"); err != nil {
return err return err
} else if err, ttl = mod.StringParam("dns.spoof.ttl"); err != nil {
return err
} }
mod.Hosts = Hosts{} mod.Hosts = Hosts{}
@ -131,6 +142,12 @@ func (mod *DNSSpoofer) Configure() error {
mod.Session.Firewall.EnableForwarding(true) mod.Session.Firewall.EnableForwarding(true)
} }
ttl_, err := strconv.ParseUint(ttl, 10, 32)
if err != nil {
return fmt.Errorf("dns.spoof.ttl value must be an integer")
}
mod.TTL = uint32(ttl_)
return nil return nil
} }
@ -184,7 +201,7 @@ func (mod *DNSSpoofer) dnsReply(pkt gopacket.Packet, peth *layers.Ethernet, pudp
Name: []byte(q.Name), Name: []byte(q.Name),
Type: q.Type, Type: q.Type,
Class: q.Class, Class: q.Class,
TTL: 1024, TTL: mod.TTL,
IP: address, IP: address,
}) })
} }