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Initial commit after restructure

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Daniel
2018-08-13 14:14:27 +02:00
commit bdeddc41f9
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11
firewall/interception/interception_linux.go Normal file
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// Copyright Safing ICS Technologies GmbH. Use of this source code is governed by the AGPL license that can be found in the LICENSE file.
package interception
import "github.com/Safing/safing-core/network/packet"
var Packets chan packet.Packet
func init() {
Packets = make(chan packet.Packet, 1000)
}

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firewall/interception/interception_windows.go Normal file
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// Copyright Safing ICS Technologies GmbH. Use of this source code is governed by the AGPL license that can be found in the LICENSE file.
package interception
import (
"github.com/Safing/safing-core/firewall/interception/windivert"
"github.com/Safing/safing-core/log"
"github.com/Safing/safing-core/modules"
"github.com/Safing/safing-core/network/packet"
)
var Packets chan packet.Packet
func init() {
Packets = make(chan packet.Packet, 1000)
}
func Start() {
windivertModule := modules.Register("Firewall:Interception:WinDivert", 192)
wd, err := windivert.New("/WinDivert.dll", "")
if err != nil {
log.Criticalf("firewall/interception: could not init windivert: %s", err)
} else {
wd.Packets(Packets)
}
<-windivertModule.Stop
windivertModule.StopComplete()
}

314
firewall/interception/nfqueue.go Normal file
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// Copyright Safing ICS Technologies GmbH. Use of this source code is governed by the AGPL license that can be found in the LICENSE file.
// +build linux
package interception
import (
"sort"
"strings"
"github.com/coreos/go-iptables/iptables"
"github.com/Safing/safing-core/firewall/interception/nfqueue"
"github.com/Safing/safing-core/log"
"github.com/Safing/safing-core/modules"
)
// iptables -A OUTPUT -p icmp -j", "NFQUEUE", "--queue-num", "1", "--queue-bypass
var nfqueueModule *modules.Module
var v4chains []string
var v4rules []string
var v4once []string
var v6chains []string
var v6rules []string
var v6once []string
func init() {
v4chains = []string{
"mangle C170",
"mangle C171",
"filter C17",
}
v4rules = []string{
"mangle C170 -j CONNMARK --restore-mark",
"mangle C170 -m mark --mark 0 -j NFQUEUE --queue-num 17040 --queue-bypass",
"mangle C171 -j CONNMARK --restore-mark",
"mangle C171 -m mark --mark 0 -j NFQUEUE --queue-num 17140 --queue-bypass",
"filter C17 -m mark --mark 0 -j DROP",
"filter C17 -m mark --mark 1700 -j ACCEPT",
"filter C17 -m mark --mark 1701 -j REJECT --reject-with icmp-host-prohibited",
"filter C17 -m mark --mark 1702 -j DROP",
"filter C17 -j CONNMARK --save-mark",
"filter C17 -m mark --mark 1710 -j ACCEPT",
"filter C17 -m mark --mark 1711 -j REJECT --reject-with icmp-host-prohibited",
"filter C17 -m mark --mark 1712 -j DROP",
"filter C17 -m mark --mark 1717 -j ACCEPT",
}
v4once = []string{
"mangle OUTPUT -j C170",
"mangle INPUT -j C171",
"filter OUTPUT -j C17",
"filter INPUT -j C17",
"nat OUTPUT -m mark --mark 1799 -p udp -j DNAT --to 127.0.0.1:53",
"nat OUTPUT -m mark --mark 1717 -p tcp -j DNAT --to 127.0.0.17:1117",
"nat OUTPUT -m mark --mark 1717 -p udp -j DNAT --to 127.0.0.17:1117",
// "nat OUTPUT -m mark --mark 1717 ! -p tcp ! -p udp -j DNAT --to 127.0.0.17",
}
v6chains = []string{
"mangle C170",
"mangle C171",
"filter C17",
}
v6rules = []string{
"mangle C170 -j CONNMARK --restore-mark",
"mangle C170 -m mark --mark 0 -j NFQUEUE --queue-num 17060 --queue-bypass",
"mangle C171 -j CONNMARK --restore-mark",
"mangle C171 -m mark --mark 0 -j NFQUEUE --queue-num 17160 --queue-bypass",
"filter C17 -m mark --mark 0 -j DROP",
"filter C17 -m mark --mark 1700 -j ACCEPT",
"filter C17 -m mark --mark 1701 -j REJECT --reject-with icmp6-adm-prohibited",
"filter C17 -m mark --mark 1702 -j DROP",
"filter C17 -j CONNMARK --save-mark",
"filter C17 -m mark --mark 1710 -j ACCEPT",
"filter C17 -m mark --mark 1711 -j REJECT --reject-with icmp6-adm-prohibited",
"filter C17 -m mark --mark 1712 -j DROP",
"filter C17 -m mark --mark 1717 -j ACCEPT",
}
v6once = []string{
"mangle OUTPUT -j C170",
"mangle INPUT -j C171",
"filter OUTPUT -j C17",
"filter INPUT -j C17",
"nat OUTPUT -m mark --mark 1799 -p udp -j DNAT --to [::1]:53",
"nat OUTPUT -m mark --mark 1717 -p tcp -j DNAT --to [fd17::17]:1117",
"nat OUTPUT -m mark --mark 1717 -p udp -j DNAT --to [fd17::17]:1117",
// "nat OUTPUT -m mark --mark 1717 ! -p tcp ! -p udp -j DNAT --to [fd17::17]",
}
// Reverse because we'd like to insert in a loop
sort.Reverse(sort.StringSlice(v4once))
sort.Reverse(sort.StringSlice(v6once))
}
func activateNfqueueFirewall() error {
// IPv4
ip4tables, err := iptables.NewWithProtocol(iptables.ProtocolIPv4)
if err != nil {
return err
}
for _, chain := range v4chains {
splittedRule := strings.Split(chain, " ")
if err = ip4tables.ClearChain(splittedRule[0], splittedRule[1]); err != nil {
return err
}
}
for _, rule := range v4rules {
splittedRule := strings.Split(rule, " ")
if err = ip4tables.Append(splittedRule[0], splittedRule[1], splittedRule[2:]...); err != nil {
return err
}
}
for _, rule := range v4once {
splittedRule := strings.Split(rule, " ")
ok, err := ip4tables.Exists(splittedRule[0], splittedRule[1], splittedRule[2:]...)
if err != nil {
return err
}
if !ok {
if err = ip4tables.Insert(splittedRule[0], splittedRule[1], 1, splittedRule[2:]...); err != nil {
return err
}
}
}
// IPv6
ip6tables, err := iptables.NewWithProtocol(iptables.ProtocolIPv6)
if err != nil {
return err
}
for _, chain := range v6chains {
splittedRule := strings.Split(chain, " ")
if err = ip6tables.ClearChain(splittedRule[0], splittedRule[1]); err != nil {
return err
}
}
for _, rule := range v6rules {
splittedRule := strings.Split(rule, " ")
if err = ip6tables.Append(splittedRule[0], splittedRule[1], splittedRule[2:]...); err != nil {
return err
}
}
for _, rule := range v6once {
splittedRule := strings.Split(rule, " ")
ok, err := ip6tables.Exists(splittedRule[0], splittedRule[1], splittedRule[2:]...)
if err != nil {
return err
}
if !ok {
if err = ip6tables.Insert(splittedRule[0], splittedRule[1], 1, splittedRule[2:]...); err != nil {
return err
}
}
}
return nil
}
func deactivateNfqueueFirewall() error {
// IPv4
ip4tables, err := iptables.NewWithProtocol(iptables.ProtocolIPv4)
if err != nil {
return err
}
for _, rule := range v4once {
splittedRule := strings.Split(rule, " ")
ok, err := ip4tables.Exists(splittedRule[0], splittedRule[1], splittedRule[2:]...)
if err != nil {
return err
}
if ok {
if err = ip4tables.Delete(splittedRule[0], splittedRule[1], splittedRule[2:]...); err != nil {
return err
}
}
}
for _, chain := range v4chains {
splittedRule := strings.Split(chain, " ")
if err := ip4tables.ClearChain(splittedRule[0], splittedRule[1]); err != nil {
return err
}
if err := ip4tables.DeleteChain(splittedRule[0], splittedRule[1]); err != nil {
return err
}
}
// IPv6
ip6tables, err := iptables.NewWithProtocol(iptables.ProtocolIPv6)
if err != nil {
return err
}
for _, rule := range v6once {
splittedRule := strings.Split(rule, " ")
ok, err := ip6tables.Exists(splittedRule[0], splittedRule[1], splittedRule[2:]...)
if err != nil {
return err
}
if ok {
if err = ip6tables.Delete(splittedRule[0], splittedRule[1], splittedRule[2:]...); err != nil {
return err
}
}
}
for _, chain := range v6chains {
splittedRule := strings.Split(chain, " ")
if err := ip6tables.ClearChain(splittedRule[0], splittedRule[1]); err != nil {
return err
}
if err := ip6tables.DeleteChain(splittedRule[0], splittedRule[1]); err != nil {
return err
}
}
return nil
}
func Start() {
nfqueueModule = modules.Register("Firewall:Interception:Nfqueue", 192)
if err := activateNfqueueFirewall(); err != nil {
log.Criticalf("could not activate firewall for nfqueue: %q", err)
}
out4Queue := nfqueue.NewNFQueue(17040)
in4Queue := nfqueue.NewNFQueue(17140)
out6Queue := nfqueue.NewNFQueue(17060)
in6Queue := nfqueue.NewNFQueue(17160)
out4Channel := out4Queue.Process()
// if err != nil {
// log.Criticalf("could not open nfqueue out4")
// } else {
defer out4Queue.Destroy()
// }
in4Channel := in4Queue.Process()
// if err != nil {
// log.Criticalf("could not open nfqueue in4")
// } else {
defer in4Queue.Destroy()
// }
out6Channel := out6Queue.Process()
// if err != nil {
// log.Criticalf("could not open nfqueue out6")
// } else {
defer out6Queue.Destroy()
// }
in6Channel := in6Queue.Process()
// if err != nil {
// log.Criticalf("could not open nfqueue in6")
// } else {
defer in6Queue.Destroy()
// }
packetInterceptionLoop:
for {
select {
case <-nfqueueModule.Stop:
break packetInterceptionLoop
case pkt := <-out4Channel:
pkt.SetOutbound()
Packets <- pkt
case pkt := <-in4Channel:
pkt.SetInbound()
Packets <- pkt
case pkt := <-out6Channel:
pkt.SetOutbound()
Packets <- pkt
case pkt := <-in6Channel:
pkt.SetInbound()
Packets <- pkt
}
}
if err := deactivateNfqueueFirewall(); err != nil {
log.Criticalf("could not deactivate firewall for nfqueue: %q", err)
}
nfqueueModule.StopComplete()
}
func stringInSlice(slice []string, value string) bool {
for _, entry := range slice {
if value == entry {
return true
}
}
return false
}

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firewall/interception/nfqueue/LICENSE Normal file
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Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
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42
firewall/interception/nfqueue/README.md Normal file
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Go-NFQueue
==========
Go Wrapper For Creating IPTables' NFQueue clients in Go
Usage
------
Check the `examples/main.go` file
```bash
cd $GOPATH/github.com/OneOfOne/go-nfqueue/examples
go build -race && sudo ./examples
```
* Open another terminal :
```bash
sudo iptables -I INPUT 1 -m conntrack --ctstate NEW -j NFQUEUE --queue-num 0
#or
sudo iptables -I INPUT -i eth0 -m conntrack --ctstate NEW -j NFQUEUE --queue-num 0
curl --head localhost
ping localhost
sudo iptables -D INPUT -m conntrack --ctstate NEW -j NFQUEUE --queue-num 0
```
Then you can `ctrl+c` the program to exit.
* If you have recent enough iptables/nfqueue you could also use a balanced (multithreaded queue).
* check the example in `examples/mq/multiqueue.go`
```bash
iptables -I INPUT 1 -m conntrack --ctstate NEW -j NFQUEUE --queue-balance 0:5 --queue-cpu-fanout
```
Notes
-----
You must run the executable as root.
This is *WIP*, but all patches are welcome.
License
-------
go-nfqueue is under the Apache v2 license, check the included license file.
Copyright © [Ahmed W.](http://www.limitlessfx.com/)
See the included `LICENSE` file.
> Copyright (c) 2014 Ahmed W.

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firewall/interception/nfqueue/multiqueue.go Normal file
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// Copyright Safing ICS Technologies GmbH. Use of this source code is governed by the AGPL license that can be found in the LICENSE file.
package nfqueue
import (
"github.com/Safing/safing-core/network/packet"
"sync"
)
type multiQueue struct {
qs []*nfQueue
}
func NewMultiQueue(min, max uint16) (mq *multiQueue) {
mq = &multiQueue{make([]*nfQueue, 0, max-min)}
for i := min; i < max; i++ {
mq.qs = append(mq.qs, NewNFQueue(i))
}
return mq
}
func (mq *multiQueue) Process() <-chan packet.Packet {
var (
wg sync.WaitGroup
out = make(chan packet.Packet, len(mq.qs))
)
for _, q := range mq.qs {
wg.Add(1)
go func(ch <-chan packet.Packet) {
for pkt := range ch {
out <- pkt
}
wg.Done()
}(q.Process())
}
go func() {
wg.Wait()
close(out)
}()
return out
}
func (mq *multiQueue) Destroy() {
for _, q := range mq.qs {
q.Destroy()
}
}

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#include "nfqueue.h"
#include "_cgo_export.h"
int nfqueue_cb_new(struct nfq_q_handle *qh, struct nfgenmsg *nfmsg, struct nfq_data *nfa, void *data) {
struct nfqnl_msg_packet_hdr *ph = nfq_get_msg_packet_hdr(nfa);
if(ph == NULL) {
return 1;
}
int id = ntohl(ph->packet_id);
unsigned char * payload;
unsigned char * saddr, * daddr;
uint16_t sport = 0, dport = 0, checksum = 0;
uint32_t mark = nfq_get_nfmark(nfa);
int len = nfq_get_payload(nfa, &payload);
unsigned char * origpayload = payload;
int origlen = len;
if(len < sizeof(struct iphdr)) {
return 0;
}
struct iphdr * ip = (struct iphdr *) payload;
if(ip->version == 4) {
uint32_t ipsz = (ip->ihl << 2);
if(len < ipsz) {
return 0;
}
len -= ipsz;
payload += ipsz;
saddr = (unsigned char *)&ip->saddr;
daddr = (unsigned char *)&ip->daddr;
if(ip->protocol == IPPROTO_TCP) {
if(len < sizeof(struct tcphdr)) {
return 0;
}
struct tcphdr *tcp = (struct tcphdr *) payload;
uint32_t tcpsz = (tcp->doff << 2);
if(len < tcpsz) {
return 0;
}
len -= tcpsz;
payload += tcpsz;
sport = ntohs(tcp->source);
dport = ntohs(tcp->dest);
checksum = ntohs(tcp->check);
} else if(ip->protocol == IPPROTO_UDP) {
if(len < sizeof(struct udphdr)) {
return 0;
}
struct udphdr *u = (struct udphdr *) payload;
len -= sizeof(struct udphdr);
payload += sizeof(struct udphdr);
sport = ntohs(u->source);
dport = ntohs(u->dest);
checksum = ntohs(u->check);
}
} else {
struct ipv6hdr *ip6 = (struct ipv6hdr*) payload;
saddr = (unsigned char *)&ip6->saddr;
daddr = (unsigned char *)&ip6->daddr;
//ipv6
}
//pass everything we can and let Go handle it, I'm not a big fan of C
uint32_t verdict = go_nfq_callback(id, ntohs(ph->hw_protocol), ph->hook, &mark, ip->version, ip->protocol,
ip->tos, ip->ttl, saddr, daddr, sport, dport, checksum, origlen, origpayload, data);
return nfq_set_verdict2(qh, id, verdict, mark, 0, NULL);
}
void loop_for_packets(struct nfq_handle *h) {
int fd = nfq_fd(h);
char buf[65535] __attribute__ ((aligned));
int rv;
while ((rv = recv(fd, buf, sizeof(buf), 0)) && rv >= 0) {
nfq_handle_packet(h, buf, rv);
}
}

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firewall/interception/nfqueue/nfqueue.go Normal file
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// Copyright Safing ICS Technologies GmbH. Use of this source code is governed by the AGPL license that can be found in the LICENSE file.
package nfqueue
/*
#cgo LDFLAGS: -lnetfilter_queue
#cgo CFLAGS: -Wall
#include "nfqueue.h"
*/
import "C"
import (
"net"
"os"
"runtime"
"sync"
"syscall"
"time"
"unsafe"
"github.com/Safing/safing-core/network/packet"
)
var queues map[uint16]*nfQueue
func init() {
queues = make(map[uint16]*nfQueue)
}
type nfQueue struct {
DefaultVerdict uint32
Timeout time.Duration
qid uint16
qidptr *uint16
h *C.struct_nfq_handle
//qh *C.struct_q_handle
qh *C.struct_nfq_q_handle
fd int
lk sync.Mutex
pktch chan packet.Packet
}
func NewNFQueue(qid uint16) (nfq *nfQueue) {
if os.Geteuid() != 0 {
panic("Must be ran by root.")
}
nfq = &nfQueue{DefaultVerdict: NFQ_ACCEPT, Timeout: 100 * time.Millisecond, qid: qid, qidptr: &qid}
queues[nfq.qid] = nfq
return nfq
}
/*
This returns a channel that will recieve packets,
the user then must call pkt.Accept() or pkt.Drop()
*/
func (this *nfQueue) Process() <-chan packet.Packet {
if this.h != nil {
return this.pktch
}
this.init()
go func() {
runtime.LockOSThread()
C.loop_for_packets(this.h)
}()
return this.pktch
}
func (this *nfQueue) init() {
var err error
if this.h, err = C.nfq_open(); err != nil || this.h == nil {
panic(err)
}
//if this.qh, err = C.nfq_create_queue(this.h, qid, C.get_cb(), unsafe.Pointer(nfq)); err != nil || this.qh == nil {
this.pktch = make(chan packet.Packet, 1)
if C.nfq_unbind_pf(this.h, C.AF_INET) < 0 {
this.Destroy()
panic("nfq_unbind_pf(AF_INET) failed, are you running root?.")
}
if C.nfq_unbind_pf(this.h, C.AF_INET6) < 0 {
this.Destroy()
panic("nfq_unbind_pf(AF_INET6) failed.")
}
if C.nfq_bind_pf(this.h, C.AF_INET) < 0 {
this.Destroy()
panic("nfq_bind_pf(AF_INET) failed.")
}
if C.nfq_bind_pf(this.h, C.AF_INET6) < 0 {
this.Destroy()
panic("nfq_bind_pf(AF_INET6) failed.")
}
if this.qh, err = C.create_queue(this.h, C.uint16_t(this.qid)); err != nil || this.qh == nil {
C.nfq_close(this.h)
panic(err)
}
this.fd = int(C.nfq_fd(this.h))
if C.nfq_set_mode(this.qh, C.NFQNL_COPY_PACKET, 0xffff) < 0 {
this.Destroy()
panic("nfq_set_mode(NFQNL_COPY_PACKET) failed.")
}
if C.nfq_set_queue_maxlen(this.qh, 1024*8) < 0 {
this.Destroy()
panic("nfq_set_queue_maxlen(1024 * 8) failed.")
}
}
func (this *nfQueue) Destroy() {
this.lk.Lock()
defer this.lk.Unlock()
if this.fd != 0 && this.Valid() {
syscall.Close(this.fd)
}
if this.qh != nil {
C.nfq_destroy_queue(this.qh)
this.qh = nil
}
if this.h != nil {
C.nfq_close(this.h)
this.h = nil
}
// TODO: don't close, we're exiting anyway
// if this.pktch != nil {
// close(this.pktch)
// }
}
func (this *nfQueue) Valid() bool {
return this.h != nil && this.qh != nil
}
//export go_nfq_callback
func go_nfq_callback(id uint32, hwproto uint16, hook uint8, mark *uint32,
version, protocol, tos, ttl uint8, saddr, daddr unsafe.Pointer,
sport, dport, checksum uint16, payload_len uint32, payload, data unsafe.Pointer) (v uint32) {
qidptr := (*uint16)(data)
qid := uint16(*qidptr)
// nfq := (*nfQueue)(nfqptr)
new_version := version
ipver := packet.IPVersion(new_version)
ipsz := C.int(ipver.ByteSize())
bs := C.GoBytes(payload, (C.int)(payload_len))
verdict := make(chan uint32, 1)
pkt := Packet{
QueueId: qid,
Id: id,
HWProtocol: hwproto,
Hook: hook,
Mark: *mark,
verdict: verdict,
// StartedHandling: time.Now(),
}
// Payload
pkt.Payload = bs
// IPHeader
pkt.IPHeader = &packet.IPHeader{
Version: 4,
Protocol: packet.IPProtocol(protocol),
Tos: tos,
TTL: ttl,
Src: net.IP(C.GoBytes(saddr, ipsz)),
Dst: net.IP(C.GoBytes(daddr, ipsz)),
}
// TCPUDPHeader
pkt.TCPUDPHeader = &packet.TCPUDPHeader{
SrcPort: sport,
DstPort: dport,
Checksum: checksum,
}
// fmt.Printf("%s queuing packet\n", time.Now().Format("060102 15:04:05.000"))
// BUG: "panic: send on closed channel" when shutting down
queues[qid].pktch <- &pkt
select {
case v = <-pkt.verdict:
*mark = pkt.Mark
// *mark = 1710
case <-time.After(queues[qid].Timeout):
v = queues[qid].DefaultVerdict
}
// log.Tracef("nfqueue: took %s to handle packet", time.Now().Sub(pkt.StartedHandling).String())
return v
}

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firewall/interception/nfqueue/nfqueue.h Normal file
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#pragma once
// #define _BSD_SOURCE
// #define __BSD_SOURCE
// #define __FAVOR_BSD // Just Using _BSD_SOURCE didn't work on my system for some reason
// #define __USE_BSD
#include <stdlib.h>
// #include <sys/socket.h>
// #include <netinet/in.h>
#include <arpa/inet.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/ipv6.h>
// #include <linux/netfilter.h>
#include <libnetfilter_queue/libnetfilter_queue.h>
// extern int nfq_callback(uint8_t version, uint8_t protocol, unsigned char *saddr, unsigned char *daddr,
// uint16_t sport, uint16_t dport, unsigned char * extra, void* data);
int nfqueue_cb_new(struct nfq_q_handle *qh, struct nfgenmsg *nfmsg, struct nfq_data *nfa, void *data);
void loop_for_packets(struct nfq_handle *h);
static inline struct nfq_q_handle * create_queue(struct nfq_handle *h, uint16_t qid) {
//we use this because it's more convient to pass the callback in C
// FIXME: check malloc success
uint16_t *data = malloc(sizeof(uint16_t));
*data = qid;
return nfq_create_queue(h, qid, &nfqueue_cb_new, (void*)data);
}

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firewall/interception/nfqueue/packet.go Normal file
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// Copyright Safing ICS Technologies GmbH. Use of this source code is governed by the AGPL license that can be found in the LICENSE file.
package nfqueue
import (
"fmt"
"github.com/Safing/safing-core/network/packet"
)
var (
ErrVerdictSentOrTimedOut error = fmt.Errorf("The verdict was already sent or timed out.")
)
const (
NFQ_DROP uint32 = 0 // discarded the packet
NFQ_ACCEPT uint32 = 1 // the packet passes, continue iterations
NFQ_STOLEN uint32 = 2 // gone away
NFQ_QUEUE uint32 = 3 // inject the packet into a different queue (the target queue number is in the high 16 bits of the verdict)
NFQ_REPEAT uint32 = 4 // iterate the same cycle once more
NFQ_STOP uint32 = 5 // accept, but don't continue iterations
)
type Packet struct {
packet.PacketBase
QueueId uint16
Id uint32
HWProtocol uint16
Hook uint8
Mark uint32
// StartedHandling time.Time
verdict chan uint32
}
// func (pkt *Packet) String() string {
// return fmt.Sprintf("<Packet QId: %d, Id: %d, Type: %s, Src: %s:%d, Dst: %s:%d, Mark: 0x%X, Checksum: 0x%X, TOS: 0x%X, TTL: %d>",
// pkt.QueueId, pkt.Id, pkt.Protocol, pkt.Src, pkt.SrcPort, pkt.Dst, pkt.DstPort, pkt.Mark, pkt.Checksum, pkt.Tos, pkt.TTL)
// }
func (pkt *Packet) setVerdict(v uint32) (err error) {
defer func() {
if x := recover(); x != nil {
err = ErrVerdictSentOrTimedOut
}
}()
pkt.verdict <- v
close(pkt.verdict)
// log.Tracef("firewall: packet %s verdict %d", pkt, v)
return err
}
// Marks:
// 17: Identifier
// 0/1: Just this packet/this Link
// 0/1/2: Accept, Block, Drop
// func (pkt *Packet) Accept() error {
// return pkt.setVerdict(NFQ_STOP)
// }
//
// func (pkt *Packet) Block() error {
// pkt.Mark = 1701
// return pkt.setVerdict(NFQ_ACCEPT)
// }
//
// func (pkt *Packet) Drop() error {
// return pkt.setVerdict(NFQ_DROP)
// }
func (pkt *Packet) Accept() error {
pkt.Mark = 1700
return pkt.setVerdict(NFQ_ACCEPT)
}
func (pkt *Packet) Block() error {
pkt.Mark = 1701
return pkt.setVerdict(NFQ_ACCEPT)
}
func (pkt *Packet) Drop() error {
pkt.Mark = 1702
return pkt.setVerdict(NFQ_ACCEPT)
}
func (pkt *Packet) PermanentAccept() error {
pkt.Mark = 1710
return pkt.setVerdict(NFQ_ACCEPT)
}
func (pkt *Packet) PermanentBlock() error {
pkt.Mark = 1711
return pkt.setVerdict(NFQ_ACCEPT)
}
func (pkt *Packet) PermanentDrop() error {
pkt.Mark = 1712
return pkt.setVerdict(NFQ_ACCEPT)
}
func (pkt *Packet) RerouteToNameserver() error {
pkt.Mark = 1799
return pkt.setVerdict(NFQ_ACCEPT)
}
func (pkt *Packet) RerouteToTunnel() error {
pkt.Mark = 1717
return pkt.setVerdict(NFQ_ACCEPT)
}
//HUGE warning, if the iptables rules aren't set correctly this can cause some problems.
// func (pkt *Packet) Repeat() error {
// return this.SetVerdict(REPEAT)
// }

154
firewall/interception/windivert/handler.go Normal file
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package windivert
import (
"errors"
"fmt"
"github.com/google/gopacket"
"github.com/google/gopacket/layers"
"github.com/Safing/safing-core/log"
"github.com/Safing/safing-core/network/packet"
"github.com/tevino/abool"
)
func (wd *WinDivert) Packets(packets chan packet.Packet) error {
go wd.packetHandler(packets)
return nil
}
func (wd *WinDivert) packetHandler(packets chan packet.Packet) {
defer close(packets)
for {
if !wd.valid.IsSet() {
return
}
packetData, packetAddress, err := wd.Recv()
if err != nil {
log.Warningf("failed to get packet from windivert: %s", err)
continue
}
ipHeader, tpcUdpHeader, payload, err := parseIpPacket(packetData)
if err != nil {
log.Warningf("failed to parse packet from windivert: %s", err)
log.Warningf("failed packet payload (%d): %s", len(packetData), string(packetData))
continue
}
new := &Packet{
windivert: wd,
packetData: packetData,
packetAddress: packetAddress,
verdictSet: abool.NewBool(false),
}
new.IPHeader = ipHeader
new.TCPUDPHeader = tpcUdpHeader
new.Payload = payload
if packetAddress.Direction == directionInbound {
new.Direction = packet.InBound
} else {
new.Direction = packet.OutBound
}
packets <- new
}
}
func parseIpPacket(packetData []byte) (ipHeader *packet.IPHeader, tpcUdpHeader *packet.TCPUDPHeader, payload []byte, err error) {
var parsedPacket gopacket.Packet
if len(packetData) == 0 {
return nil, nil, nil, errors.New("empty packet")
}
switch packetData[0] >> 4 {
case 4:
parsedPacket = gopacket.NewPacket(packetData, layers.LayerTypeIPv4, gopacket.DecodeOptions{Lazy: true, NoCopy: true})
if ipv4Layer := parsedPacket.Layer(layers.LayerTypeIPv4); ipv4Layer != nil {
ipv4, _ := ipv4Layer.(*layers.IPv4)
ipHeader = &packet.IPHeader{
Version: 4,
Protocol: packet.IPProtocol(ipv4.Protocol),
Tos: ipv4.TOS,
TTL: ipv4.TTL,
Src: ipv4.SrcIP,
Dst: ipv4.DstIP,
}
} else {
var err error
if errLayer := parsedPacket.ErrorLayer(); errLayer != nil {
err = errLayer.Error()
}
return nil, nil, nil, fmt.Errorf("failed to parse IPv4 packet: %s", err)
}
case 6:
parsedPacket = gopacket.NewPacket(packetData, layers.LayerTypeIPv6, gopacket.DecodeOptions{Lazy: true, NoCopy: true})
if ipv6Layer := parsedPacket.Layer(layers.LayerTypeIPv6); ipv6Layer != nil {
ipv6, _ := ipv6Layer.(*layers.IPv6)
ipHeader = &packet.IPHeader{
Version: 6,
Protocol: packet.IPProtocol(ipv6.NextHeader),
Tos: ipv6.TrafficClass,
TTL: ipv6.HopLimit,
Src: ipv6.SrcIP,
Dst: ipv6.DstIP,
}
} else {
var err error
if errLayer := parsedPacket.ErrorLayer(); errLayer != nil {
err = errLayer.Error()
}
return nil, nil, nil, fmt.Errorf("failed to parse IPv6 packet: %s", err)
}
default:
return nil, nil, nil, errors.New("unknown IP version")
}
switch ipHeader.Protocol {
case packet.TCP:
if tcpLayer := parsedPacket.Layer(layers.LayerTypeTCP); tcpLayer != nil {
tcp, _ := tcpLayer.(*layers.TCP)
tpcUdpHeader = &packet.TCPUDPHeader{
SrcPort: uint16(tcp.SrcPort),
DstPort: uint16(tcp.DstPort),
Checksum: tcp.Checksum,
}
} else {
var err error
if errLayer := parsedPacket.ErrorLayer(); errLayer != nil {
err = errLayer.Error()
}
return nil, nil, nil, fmt.Errorf("could not parse TCP layer: %s", err)
}
case packet.UDP:
if udpLayer := parsedPacket.Layer(layers.LayerTypeUDP); udpLayer != nil {
udp, _ := udpLayer.(*layers.UDP)
tpcUdpHeader = &packet.TCPUDPHeader{
SrcPort: uint16(udp.SrcPort),
DstPort: uint16(udp.DstPort),
Checksum: udp.Checksum,
}
} else {
var err error
if errLayer := parsedPacket.ErrorLayer(); errLayer != nil {
err = errLayer.Error()
}
return nil, nil, nil, fmt.Errorf("could not parse UDP layer: %s", err)
}
}
if appLayer := parsedPacket.ApplicationLayer(); appLayer != nil {
payload = appLayer.Payload()
}
if errLayer := parsedPacket.ErrorLayer(); errLayer != nil {
return nil, nil, nil, errLayer.Error()
}
return
}

32
firewall/interception/windivert/notes.md Normal file
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# Notes
## Interception
- use windivert DLL
- cgo or loadDLL?
- netfilter exmaple: https://reqrypt.org/samples/netfilter.html
- v1.4 docs: https://reqrypt.org/windivert-doc.html#divert_recv_ex
- source: https://github.com/basil00/Divert
- other GO package wrapping this: https://github.com/clmul/go-windivert/blob/master/divert_windows.go
## Packet/Process Attribution
- use Iphlpapi.dll
- GetExtendedTcpTable
- GetOwnerModuleFromTcpEntry
- GetExtendedUdpTable
- GetOwnerModuleFromUdpEntry
- for generic IP?
## Helpful resources
Calling Windows APIs
https://stackoverflow.com/questions/33709033/golang-how-can-i-call-win32-api-without-cgo#33709631
GetExtendedTcpTable (from Iphlpapi.dll)
https://msdn.microsoft.com/en-us/library/windows/desktop/aa365928(v=vs.85).aspx
GetUdpTable Example
https://stackoverflow.com/questions/49167311/how-to-convert-uintptr-to-go-struct

55
firewall/interception/windivert/packet.go Normal file
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package windivert
import (
"github.com/Safing/safing-core/network/packet"
"github.com/tevino/abool"
)
type Packet struct {
packet.PacketBase
windivert *WinDivert
packetData []byte
packetAddress *WinDivertAddress
verdictSet *abool.AtomicBool
}
func (pkt *Packet) Accept() error {
if pkt.verdictSet.SetToIf(false, true) {
return pkt.windivert.Send(pkt.packetData, pkt.packetAddress)
}
return nil
}
func (pkt *Packet) Block() error {
if pkt.verdictSet.SetToIf(false, true) {
// TODO: implement blocking mechanism
return nil
}
return nil
}
func (pkt *Packet) Drop() error {
return nil
}
func (pkt *Packet) PermanentAccept() error {
return pkt.Accept()
}
func (pkt *Packet) PermanentBlock() error {
return pkt.Block()
}
func (pkt *Packet) PermanentDrop() error {
return pkt.Drop()
}
func (pkt *Packet) RerouteToNameserver() error {
return nil
}
func (pkt *Packet) RerouteToTunnel() error {
return nil
}

54
firewall/interception/windivert/test/build Normal file
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#!/bin/bash
# get build data
if [[ "$BUILD_COMMIT" == "" ]]; then
BUILD_COMMIT=$(git describe --all --long --abbrev=99 --dirty 2>/dev/null)
fi
if [[ "$BUILD_USER" == "" ]]; then
BUILD_USER=$(id -un)
fi
if [[ "$BUILD_HOST" == "" ]]; then
BUILD_HOST=$(hostname -f)
fi
if [[ "$BUILD_DATE" == "" ]]; then
BUILD_DATE=$(date +%d.%m.%Y)
fi
if [[ "$BUILD_SOURCE" == "" ]]; then
BUILD_SOURCE=$(git remote -v | grep origin | cut -f2 | cut -d" " -f1 | head -n 1)
fi
if [[ "$BUILD_SOURCE" == "" ]]; then
BUILD_SOURCE=$(git remote -v | cut -f2 | cut -d" " -f1 | head -n 1)
fi
BUILD_BUILDOPTIONS=$(echo $* | sed "s/ /§/g")
# check
if [[ "$BUILD_COMMIT" == "" ]]; then
echo "could not automatically determine BUILD_COMMIT, please supply manually as environment variable."
exit 1
fi
if [[ "$BUILD_USER" == "" ]]; then
echo "could not automatically determine BUILD_USER, please supply manually as environment variable."
exit 1
fi
if [[ "$BUILD_HOST" == "" ]]; then
echo "could not automatically determine BUILD_HOST, please supply manually as environment variable."
exit 1
fi
if [[ "$BUILD_DATE" == "" ]]; then
echo "could not automatically determine BUILD_DATE, please supply manually as environment variable."
exit 1
fi
if [[ "$BUILD_SOURCE" == "" ]]; then
echo "could not automatically determine BUILD_SOURCE, please supply manually as environment variable."
exit 1
fi
echo "Please notice, that this build script includes metadata into the build."
echo "This information is useful for debugging and license compliance."
echo "Run the compiled binary with the -v flag to see the information included."
# build
if [[ "$BUILD_PATH" == "" ]]; then
BUILD_PATH=$(go list)
fi
go build -ldflags "-X ${BUILD_PATH}/meta.commit=${BUILD_COMMIT} -X ${BUILD_PATH}/meta.buildOptions=${BUILD_BUILDOPTIONS} -X ${BUILD_PATH}/meta.buildUser=${BUILD_USER} -X ${BUILD_PATH}/meta.buildHost=${BUILD_HOST} -X ${BUILD_PATH}/meta.buildDate=${BUILD_DATE} -X ${BUILD_PATH}/meta.buildSource=${BUILD_SOURCE}" $*

BIN
firewall/interception/windivert/test/main.exe Normal file
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66
firewall/interception/windivert/test/main.go Normal file
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package main
import (
"fmt"
"os"
"os/signal"
"runtime/pprof"
"syscall"
"time"
"github.com/Safing/safing-core/firewall/interception/windivert"
"github.com/Safing/safing-core/log"
"github.com/Safing/safing-core/modules"
"github.com/Safing/safing-core/network/packet"
)
func main() {
modules.RegisterLogger(log.Logger)
wd, err := windivert.New("C:/WinDivert.dll", "")
if err != nil {
panic(err)
}
defer wd.Close()
packets := make(chan packet.Packet, 1000)
wd.Packets(packets)
go func() {
for pkt := range packets {
log.Infof("pkt: %s", pkt)
if pkt.GetIPHeader().Protocol == 0 || pkt.GetIPHeader().Protocol == 128 {
pl := pkt.GetPayload()
log.Infof("payload (%d): %s", len(pl), string(pl))
}
pkt.Accept()
}
}()
// SHUTDOWN
// catch interrupt for clean shutdown
signalCh := make(chan os.Signal)
signal.Notify(
signalCh,
os.Interrupt,
os.Kill,
syscall.SIGHUP,
syscall.SIGINT,
syscall.SIGTERM,
syscall.SIGQUIT,
syscall.SIGKILL,
syscall.SIGSEGV,
)
select {
case <-signalCh:
log.Warning("program was interrupted, shutting down.")
modules.InitiateFullShutdown()
case <-modules.GlobalShutdown:
}
// wait for shutdown to complete, panic after timeout
time.Sleep(5 * time.Second)
fmt.Println("===== TAKING TOO LONG FOR SHUTDOWN - PRINTING STACK TRACES =====")
pprof.Lookup("goroutine").WriteTo(os.Stdout, 1)
os.Exit(1)
}

248
firewall/interception/windivert/windivert.go Normal file
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package windivert
import (
"errors"
"fmt"
"strings"
"unsafe"
"golang.org/x/sys/windows"
"github.com/tevino/abool"
)
type WinDivert struct {
dll *windows.DLL
handle uintptr
open *windows.Proc
recv *windows.Proc
send *windows.Proc
close *windows.Proc
setParam *windows.Proc
getParam *windows.Proc
helperCalcChecksums *windows.Proc
helperCheckFilter *windows.Proc
valid *abool.AtomicBool
}
// copied from windivert.h
type WinDivertAddress struct {
Timestamp int64 /* Packet's timestamp. */
IfIdx uint32 /* Packet's interface index. */
SubIfIdx uint32 /* Packet's sub-interface index. */
Direction uint8 /* Packet's direction. */
Loopback uint8 /* Packet is loopback? */
Impostor uint8 /* Packet is impostor? */
PseudoIPChecksum uint8 /* Packet has pseudo IPv4 checksum? */
PseudoTCPChecksum uint8 /* Packet has pseudo TCP checksum? */
PseudoUDPChecksum uint8 /* Packet has pseudo UDP checksum? */
Reserved uint8
}
// copied from windivert.h
const (
directionInbound uint8 = 1
directionOutbound uint8 = 0
// Divert layers
layerNetwork uintptr = 0 /* Network layer. */
layerNetworkForward uintptr = 1 /* Network layer (forwarded packets) */
// Divert parameters
flagSniff uintptr = 1
flagDrop uintptr = 2
flagDebug uintptr = 4
paramQueueLen uintptr = 0 /* Packet queue length. */
paramQueueTime uintptr = 1 /* Packet queue time. */
paramQueueSize uintptr = 2 /* Packet queue size. */
rvInvalidHandle int = -1
rvFalse uintptr = 0
rvTrue uintptr = 1
)
func New(dllLocation, filter string) (*WinDivert, error) {
new := &WinDivert{}
var err error
// load dll
new.dll, err = windows.LoadDLL(dllLocation)
if err != nil {
return nil, err
}
// load functions
new.open, err = new.dll.FindProc("WinDivertOpen")
if err != nil {
return nil, fmt.Errorf("could not find proc WinDivertOpen: %s", err)
}
new.recv, err = new.dll.FindProc("WinDivertRecv")
if err != nil {
return nil, fmt.Errorf("could not find proc WinDivertRecv: %s", err)
}
new.send, err = new.dll.FindProc("WinDivertSend")
if err != nil {
return nil, fmt.Errorf("could not find proc WinDivertSend: %s", err)
}
new.close, err = new.dll.FindProc("WinDivertClose")
if err != nil {
return nil, fmt.Errorf("could not find proc WinDivertClose: %s", err)
}
new.setParam, err = new.dll.FindProc("WinDivertSetParam")
if err != nil {
return nil, fmt.Errorf("could not find proc WinDivertSetParam: %s", err)
}
new.getParam, err = new.dll.FindProc("WinDivertGetParam")
if err != nil {
return nil, fmt.Errorf("could not find proc WinDivertGetParam: %s", err)
}
new.helperCalcChecksums, err = new.dll.FindProc("WinDivertHelperCalcChecksums")
if err != nil {
return nil, fmt.Errorf("could not find proc WinDivertHelperCalcChecksums: %s", err)
}
new.helperCheckFilter, err = new.dll.FindProc("WinDivertHelperCheckFilter")
if err != nil {
return nil, fmt.Errorf("could not find proc WinDivertHelperCheckFilter: %s", err)
}
// default filter
if filter == "" {
filter = "true"
}
// open
err = new.Open(filter)
if err != nil {
return nil, fmt.Errorf("could not open new windivert handle: %s", err)
}
return new, nil
}
func (wd *WinDivert) Open(filter string) error {
r1, _, lastErr := wd.open.Call(
stringToPtr(filter), // __in const char *filter
layerNetwork, // __in WINDIVERT_LAYER layer
0, // __in INT16 priority
0, // __in UINT64 flags
)
if int(r1) == rvInvalidHandle {
return lastErr
}
wd.handle = r1
wd.valid = abool.NewBool(true)
return nil
}
func (wd *WinDivert) Recv() ([]byte, *WinDivertAddress, error) {
buf := make([]byte, 4096) // TODO: we can do this better
address := &WinDivertAddress{}
readLen := 0
r1, _, lastErr := wd.recv.Call(
wd.handle, // __in HANDLE handle
byteSliceToPtr(buf), // __out PVOID pPacket
uintptr(len(buf)), // __in UINT packetLen
uintptr(unsafe.Pointer(address)), // __out_opt PWINDIVERT_ADDRESS pAddr
uintptr(unsafe.Pointer(&readLen)), // __out_opt UINT *readLen
)
if r1 == rvFalse {
return nil, nil, lastErr
}
if readLen == 0 {
return nil, nil, errors.New("empty read")
}
return buf[:readLen], address, nil
}
func (wd *WinDivert) Send(packetData []byte, address *WinDivertAddress) error {
writeLen := 0
r1, _, lastErr := wd.send.Call(
wd.handle, // __in HANDLE handle
byteSliceToPtr(packetData), // __in PVOID pPacket
uintptr(len(packetData)), // __in UINT packetLen
uintptr(unsafe.Pointer(address)), // __in PWINDIVERT_ADDRESS pAddr
uintptr(unsafe.Pointer(&writeLen)), // __out_opt UINT *writeLen
)
if r1 == rvFalse {
return lastErr
}
return nil
}
func (wd *WinDivert) Close() error {
r1, _, lastErr := wd.close.Call(
wd.handle, // __in HANDLE handle
)
if r1 == rvFalse {
return lastErr
}
return nil
}
func (wd *WinDivert) SetParam(param, value uintptr) error {
r1, _, lastErr := wd.setParam.Call(
wd.handle, // __in HANDLE handle
param, // __in WINDIVERT_PARAM param
value, // __in UINT64 value
)
if r1 == rvFalse {
return lastErr
}
return nil
}
func (wd *WinDivert) GetParam(param uintptr) (uint64, error) {
var value uint64
r1, _, lastErr := wd.getParam.Call(
wd.handle, // __in HANDLE handle
param, // __in WINDIVERT_PARAM param
uintptr(unsafe.Pointer(&value)), // __out UINT64 *pValue
)
if r1 == rvFalse {
return 0, lastErr
}
return value, nil
}
func (wd *WinDivert) HelperCalcChecksums(packetData []byte, address *WinDivertAddress, flags uintptr) error {
r1, _, lastErr := wd.setParam.Call(
byteSliceToPtr(packetData), // __inout PVOID pPacket
uintptr(len(packetData)), // __in UINT packetLen
uintptr(unsafe.Pointer(address)), // __in_opt PWINDIVERT_ADDRESS pAddr
flags, // __in UINT64 flags
)
if r1 == rvFalse {
return lastErr
}
return nil
}
// func (wd *WinDivert) HelperCheckFilter() {
// // __in const char *filter
// // __in WINDIVERT_LAYER layer
// // __out_opt const char **errorStr
// // __out_opt UINT *errorPos
// }
func stringToPtr(s string) uintptr {
if !strings.HasSuffix(s, "\x00") {
s = s + "\x00"
}
a := []byte(s)
return uintptr(unsafe.Pointer(&a[0]))
}
func byteSliceToPtr(a []byte) uintptr {
return uintptr(unsafe.Pointer(&a[0]))
}

410
firewall/interception/windivert/windivert.h Normal file
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@@ -0,0 +1,410 @@
/*
* windivert.h
* (C) 2018, all rights reserved,
*
* This file is part of WinDivert.
*
* WinDivert is free software: you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the
* Free Software Foundation, either version 3 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* WinDivert is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc., 51
* Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef __WINDIVERT_H
#define __WINDIVERT_H
#ifndef WINDIVERT_KERNEL
#include <windows.h>
#endif /* WINDIVERT_KERNEL */
#ifndef WINDIVERTEXPORT
#define WINDIVERTEXPORT __declspec(dllimport)
#endif /* WINDIVERTEXPORT */
#ifdef __MINGW32__
#define __in
#define __in_opt
#define __out
#define __out_opt
#define __inout
#define __inout_opt
#include <stdint.h>
#define INT8 int8_t
#define UINT8 uint8_t
#define INT16 int16_t
#define UINT16 uint16_t
#define INT32 int32_t
#define UINT32 uint32_t
#define INT64 int64_t
#define UINT64 uint64_t
#endif /* __MINGW32__ */
#ifdef __cplusplus
extern "C" {
#endif
/****************************************************************************/
/* WINDIVERT API */
/****************************************************************************/
/*
* Divert address.
*/
typedef struct
{
INT64 Timestamp; /* Packet's timestamp. */
UINT32 IfIdx; /* Packet's interface index. */
UINT32 SubIfIdx; /* Packet's sub-interface index. */
UINT8 Direction:1; /* Packet's direction. */
UINT8 Loopback:1; /* Packet is loopback? */
UINT8 Impostor:1; /* Packet is impostor? */
UINT8 PseudoIPChecksum:1; /* Packet has pseudo IPv4 checksum? */
UINT8 PseudoTCPChecksum:1; /* Packet has pseudo TCP checksum? */
UINT8 PseudoUDPChecksum:1; /* Packet has pseudo UDP checksum? */
UINT8 Reserved:2;
} WINDIVERT_ADDRESS, *PWINDIVERT_ADDRESS;
#define WINDIVERT_DIRECTION_OUTBOUND 0
#define WINDIVERT_DIRECTION_INBOUND 1
/*
* Divert layers.
*/
typedef enum
{
WINDIVERT_LAYER_NETWORK = 0, /* Network layer. */
WINDIVERT_LAYER_NETWORK_FORWARD = 1 /* Network layer (forwarded packets) */
} WINDIVERT_LAYER, *PWINDIVERT_LAYER;
/*
* Divert flags.
*/
#define WINDIVERT_FLAG_SNIFF 1
#define WINDIVERT_FLAG_DROP 2
#define WINDIVERT_FLAG_DEBUG 4
/*
* Divert parameters.
*/
typedef enum
{
WINDIVERT_PARAM_QUEUE_LEN = 0, /* Packet queue length. */
WINDIVERT_PARAM_QUEUE_TIME = 1, /* Packet queue time. */
WINDIVERT_PARAM_QUEUE_SIZE = 2 /* Packet queue size. */
} WINDIVERT_PARAM, *PWINDIVERT_PARAM;
#define WINDIVERT_PARAM_MAX WINDIVERT_PARAM_QUEUE_SIZE
#ifndef WINDIVERT_KERNEL
/*
* Open a WinDivert handle.
*/
extern WINDIVERTEXPORT HANDLE WinDivertOpen(
__in const char *filter,
__in WINDIVERT_LAYER layer,
__in INT16 priority,
__in UINT64 flags);
/*
* Receive (read) a packet from a WinDivert handle.
*/
extern WINDIVERTEXPORT BOOL WinDivertRecv(
__in HANDLE handle,
__out PVOID pPacket,
__in UINT packetLen,
__out_opt PWINDIVERT_ADDRESS pAddr,
__out_opt UINT *readLen);
/*
* Receive (read) a packet from a WinDivert handle.
*/
extern WINDIVERTEXPORT BOOL WinDivertRecvEx(
__in HANDLE handle,
__out PVOID pPacket,
__in UINT packetLen,
__in UINT64 flags,
__out_opt PWINDIVERT_ADDRESS pAddr,
__out_opt UINT *readLen,
__inout_opt LPOVERLAPPED lpOverlapped);
/*
* Send (write/inject) a packet to a WinDivert handle.
*/
extern WINDIVERTEXPORT BOOL WinDivertSend(
__in HANDLE handle,
__in PVOID pPacket,
__in UINT packetLen,
__in PWINDIVERT_ADDRESS pAddr,
__out_opt UINT *writeLen);
/*
* Send (write/inject) a packet to a WinDivert handle.
*/
extern WINDIVERTEXPORT BOOL WinDivertSendEx(
__in HANDLE handle,
__in PVOID pPacket,
__in UINT packetLen,
__in UINT64 flags,
__in PWINDIVERT_ADDRESS pAddr,
__out_opt UINT *writeLen,
__inout_opt LPOVERLAPPED lpOverlapped);
/*
* Close a WinDivert handle.
*/
extern WINDIVERTEXPORT BOOL WinDivertClose(
__in HANDLE handle);
/*
* Set a WinDivert handle parameter.
*/
extern WINDIVERTEXPORT BOOL WinDivertSetParam(
__in HANDLE handle,
__in WINDIVERT_PARAM param,
__in UINT64 value);
/*
* Get a WinDivert handle parameter.
*/
extern WINDIVERTEXPORT BOOL WinDivertGetParam(
__in HANDLE handle,
__in WINDIVERT_PARAM param,
__out UINT64 *pValue);
#endif /* WINDIVERT_KERNEL */
/****************************************************************************/
/* WINDIVERT HELPER API */
/****************************************************************************/
/*
* IPv4/IPv6/ICMP/ICMPv6/TCP/UDP header definitions.
*/
typedef struct
{
UINT8 HdrLength:4;
UINT8 Version:4;
UINT8 TOS;
UINT16 Length;
UINT16 Id;
UINT16 FragOff0;
UINT8 TTL;
UINT8 Protocol;
UINT16 Checksum;
UINT32 SrcAddr;
UINT32 DstAddr;
} WINDIVERT_IPHDR, *PWINDIVERT_IPHDR;
#define WINDIVERT_IPHDR_GET_FRAGOFF(hdr) \
(((hdr)->FragOff0) & 0xFF1F)
#define WINDIVERT_IPHDR_GET_MF(hdr) \
((((hdr)->FragOff0) & 0x0020) != 0)
#define WINDIVERT_IPHDR_GET_DF(hdr) \
((((hdr)->FragOff0) & 0x0040) != 0)
#define WINDIVERT_IPHDR_GET_RESERVED(hdr) \
((((hdr)->FragOff0) & 0x0080) != 0)
#define WINDIVERT_IPHDR_SET_FRAGOFF(hdr, val) \
do \
{ \
(hdr)->FragOff0 = (((hdr)->FragOff0) & 0x00E0) | \
((val) & 0xFF1F); \
} \
while (FALSE)
#define WINDIVERT_IPHDR_SET_MF(hdr, val) \
do \
{ \
(hdr)->FragOff0 = (((hdr)->FragOff0) & 0xFFDF) | \
(((val) & 0x0001) << 5); \
} \
while (FALSE)
#define WINDIVERT_IPHDR_SET_DF(hdr, val) \
do \
{ \
(hdr)->FragOff0 = (((hdr)->FragOff0) & 0xFFBF) | \
(((val) & 0x0001) << 6); \
} \
while (FALSE)
#define WINDIVERT_IPHDR_SET_RESERVED(hdr, val) \
do \
{ \
(hdr)->FragOff0 = (((hdr)->FragOff0) & 0xFF7F) | \
(((val) & 0x0001) << 7); \
} \
while (FALSE)
typedef struct
{
UINT8 TrafficClass0:4;
UINT8 Version:4;
UINT8 FlowLabel0:4;
UINT8 TrafficClass1:4;
UINT16 FlowLabel1;
UINT16 Length;
UINT8 NextHdr;
UINT8 HopLimit;
UINT32 SrcAddr[4];
UINT32 DstAddr[4];
} WINDIVERT_IPV6HDR, *PWINDIVERT_IPV6HDR;
#define WINDIVERT_IPV6HDR_GET_TRAFFICCLASS(hdr) \
((((hdr)->TrafficClass0) << 4) | ((hdr)->TrafficClass1))
#define WINDIVERT_IPV6HDR_GET_FLOWLABEL(hdr) \
((((UINT32)(hdr)->FlowLabel0) << 16) | ((UINT32)(hdr)->FlowLabel1))
#define WINDIVERT_IPV6HDR_SET_TRAFFICCLASS(hdr, val) \
do \
{ \
(hdr)->TrafficClass0 = ((UINT8)(val) >> 4); \
(hdr)->TrafficClass1 = (UINT8)(val); \
} \
while (FALSE)
#define WINDIVERT_IPV6HDR_SET_FLOWLABEL(hdr, val) \
do \
{ \
(hdr)->FlowLabel0 = (UINT8)((val) >> 16); \
(hdr)->FlowLabel1 = (UINT16)(val); \
} \
while (FALSE)
typedef struct
{
UINT8 Type;
UINT8 Code;
UINT16 Checksum;
UINT32 Body;
} WINDIVERT_ICMPHDR, *PWINDIVERT_ICMPHDR;
typedef struct
{
UINT8 Type;
UINT8 Code;
UINT16 Checksum;
UINT32 Body;
} WINDIVERT_ICMPV6HDR, *PWINDIVERT_ICMPV6HDR;
typedef struct
{
UINT16 SrcPort;
UINT16 DstPort;
UINT32 SeqNum;
UINT32 AckNum;
UINT16 Reserved1:4;
UINT16 HdrLength:4;
UINT16 Fin:1;
UINT16 Syn:1;
UINT16 Rst:1;
UINT16 Psh:1;
UINT16 Ack:1;
UINT16 Urg:1;
UINT16 Reserved2:2;
UINT16 Window;
UINT16 Checksum;
UINT16 UrgPtr;
} WINDIVERT_TCPHDR, *PWINDIVERT_TCPHDR;
typedef struct
{
UINT16 SrcPort;
UINT16 DstPort;
UINT16 Length;
UINT16 Checksum;
} WINDIVERT_UDPHDR, *PWINDIVERT_UDPHDR;
#ifndef WINDIVERT_KERNEL
/*
* Flags for WinDivertHelperCalcChecksums()
*/
#define WINDIVERT_HELPER_NO_IP_CHECKSUM 1
#define WINDIVERT_HELPER_NO_ICMP_CHECKSUM 2
#define WINDIVERT_HELPER_NO_ICMPV6_CHECKSUM 4
#define WINDIVERT_HELPER_NO_TCP_CHECKSUM 8
#define WINDIVERT_HELPER_NO_UDP_CHECKSUM 16
/*
* Parse IPv4/IPv6/ICMP/ICMPv6/TCP/UDP headers from a raw packet.
*/
extern WINDIVERTEXPORT BOOL WinDivertHelperParsePacket(
__in PVOID pPacket,
__in UINT packetLen,
__out_opt PWINDIVERT_IPHDR *ppIpHdr,
__out_opt PWINDIVERT_IPV6HDR *ppIpv6Hdr,
__out_opt PWINDIVERT_ICMPHDR *ppIcmpHdr,
__out_opt PWINDIVERT_ICMPV6HDR *ppIcmpv6Hdr,
__out_opt PWINDIVERT_TCPHDR *ppTcpHdr,
__out_opt PWINDIVERT_UDPHDR *ppUdpHdr,
__out_opt PVOID *ppData,
__out_opt UINT *pDataLen);
/*
* Parse an IPv4 address.
*/
extern WINDIVERTEXPORT BOOL WinDivertHelperParseIPv4Address(
__in const char *addrStr,
__out_opt UINT32 *pAddr);
/*
* Parse an IPv6 address.
*/
extern WINDIVERTEXPORT BOOL WinDivertHelperParseIPv6Address(
__in const char *addrStr,
__out_opt UINT32 *pAddr);
/*
* Calculate IPv4/IPv6/ICMP/ICMPv6/TCP/UDP checksums.
*/
extern WINDIVERTEXPORT UINT WinDivertHelperCalcChecksums(
__inout PVOID pPacket,
__in UINT packetLen,
__in_opt PWINDIVERT_ADDRESS pAddr,
__in UINT64 flags);
/*
* Check the given filter string.
*/
extern WINDIVERTEXPORT BOOL WinDivertHelperCheckFilter(
__in const char *filter,
__in WINDIVERT_LAYER layer,
__out_opt const char **errorStr,
__out_opt UINT *errorPos);
/*
* Evaluate the given filter string.
*/
extern WINDIVERTEXPORT BOOL WinDivertHelperEvalFilter(
__in const char *filter,
__in WINDIVERT_LAYER layer,
__in PVOID pPacket,
__in UINT packetLen,
__in PWINDIVERT_ADDRESS pAddr);
#endif /* WINDIVERT_KERNEL */
#ifdef __cplusplus
}
#endif
#endif /* __WINDIVERT_H */