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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"
"fmt"
"net"
"strconv"
"sync"
"github.com/bettercap/bettercap/packets"
@ -20,6 +21,7 @@ type DNSSpoofer struct {
session.SessionModule
Handle *pcap.Handle
Hosts Hosts
TTL uint32
All bool
waitGroup *sync.WaitGroup
pktSourceChan chan gopacket.Packet
@ -31,6 +33,7 @@ func NewDNSSpoofer(s *session.Session) *DNSSpoofer {
Handle: nil,
All: false,
Hosts: Hosts{},
TTL: 1024,
waitGroup: &sync.WaitGroup{},
}
@ -55,6 +58,11 @@ func NewDNSSpoofer(s *session.Session) *DNSSpoofer {
"false",
"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", "",
"Start the DNS spoofer in the background.",
func(args []string) error {
@ -84,6 +92,7 @@ func (mod DNSSpoofer) Author() string {
func (mod *DNSSpoofer) Configure() error {
var err error
var ttl string
var hostsFile string
var domains []string
var address net.IP
@ -102,6 +111,8 @@ func (mod *DNSSpoofer) Configure() error {
return err
} else if err, hostsFile = mod.StringParam("dns.spoof.hosts"); err != nil {
return err
} else if err, ttl = mod.StringParam("dns.spoof.ttl"); err != nil {
return err
}
mod.Hosts = Hosts{}
@ -131,6 +142,12 @@ func (mod *DNSSpoofer) Configure() error {
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
}
@ -184,7 +201,7 @@ func (mod *DNSSpoofer) dnsReply(pkt gopacket.Packet, peth *layers.Ethernet, pudp
Name: []byte(q.Name),
Type: q.Type,
Class: q.Class,
TTL: 1024,
TTL: mod.TTL,
IP: address,
})
}