mirror of https://github.com/slackhq/nebula.git
126 lines
2.4 KiB
Go
126 lines
2.4 KiB
Go
//go:build ios && !e2e_testing
|
|
// +build ios,!e2e_testing
|
|
|
|
package overlay
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"io"
|
|
"net"
|
|
"os"
|
|
"sync"
|
|
"syscall"
|
|
|
|
"github.com/sirupsen/logrus"
|
|
"github.com/slackhq/nebula/cidr"
|
|
"github.com/slackhq/nebula/iputil"
|
|
)
|
|
|
|
type tun struct {
|
|
io.ReadWriteCloser
|
|
cidr *net.IPNet
|
|
routeTree *cidr.Tree4
|
|
}
|
|
|
|
func newTun(_ *logrus.Logger, _ string, _ *net.IPNet, _ int, _ []Route, _ int, _ bool) (*tun, error) {
|
|
return nil, fmt.Errorf("newTun not supported in iOS")
|
|
}
|
|
|
|
func newTunFromFd(l *logrus.Logger, deviceFd int, cidr *net.IPNet, _ int, routes []Route, _ int) (*tun, error) {
|
|
routeTree, err := makeRouteTree(l, routes, false)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
file := os.NewFile(uintptr(deviceFd), "/dev/tun")
|
|
return &tun{
|
|
cidr: cidr,
|
|
ReadWriteCloser: &tunReadCloser{f: file},
|
|
routeTree: routeTree,
|
|
}, nil
|
|
}
|
|
|
|
func (t *tun) Activate() error {
|
|
return nil
|
|
}
|
|
|
|
func (t *tun) RouteFor(ip iputil.VpnIp) iputil.VpnIp {
|
|
r := t.routeTree.MostSpecificContains(ip)
|
|
if r != nil {
|
|
return r.(iputil.VpnIp)
|
|
}
|
|
|
|
return 0
|
|
}
|
|
|
|
// The following is hoisted up from water, we do this so we can inject our own fd on iOS
|
|
type tunReadCloser struct {
|
|
f io.ReadWriteCloser
|
|
|
|
rMu sync.Mutex
|
|
rBuf []byte
|
|
|
|
wMu sync.Mutex
|
|
wBuf []byte
|
|
}
|
|
|
|
func (tr *tunReadCloser) Read(to []byte) (int, error) {
|
|
tr.rMu.Lock()
|
|
defer tr.rMu.Unlock()
|
|
|
|
if cap(tr.rBuf) < len(to)+4 {
|
|
tr.rBuf = make([]byte, len(to)+4)
|
|
}
|
|
tr.rBuf = tr.rBuf[:len(to)+4]
|
|
|
|
n, err := tr.f.Read(tr.rBuf)
|
|
copy(to, tr.rBuf[4:])
|
|
return n - 4, err
|
|
}
|
|
|
|
func (tr *tunReadCloser) Write(from []byte) (int, error) {
|
|
if len(from) == 0 {
|
|
return 0, syscall.EIO
|
|
}
|
|
|
|
tr.wMu.Lock()
|
|
defer tr.wMu.Unlock()
|
|
|
|
if cap(tr.wBuf) < len(from)+4 {
|
|
tr.wBuf = make([]byte, len(from)+4)
|
|
}
|
|
tr.wBuf = tr.wBuf[:len(from)+4]
|
|
|
|
// Determine the IP Family for the NULL L2 Header
|
|
ipVer := from[0] >> 4
|
|
if ipVer == 4 {
|
|
tr.wBuf[3] = syscall.AF_INET
|
|
} else if ipVer == 6 {
|
|
tr.wBuf[3] = syscall.AF_INET6
|
|
} else {
|
|
return 0, errors.New("unable to determine IP version from packet")
|
|
}
|
|
|
|
copy(tr.wBuf[4:], from)
|
|
|
|
n, err := tr.f.Write(tr.wBuf)
|
|
return n - 4, err
|
|
}
|
|
|
|
func (tr *tunReadCloser) Close() error {
|
|
return tr.f.Close()
|
|
}
|
|
|
|
func (t *tun) Cidr() *net.IPNet {
|
|
return t.cidr
|
|
}
|
|
|
|
func (t *tun) Name() string {
|
|
return "iOS"
|
|
}
|
|
|
|
func (t *tun) NewMultiQueueReader() (io.ReadWriteCloser, error) {
|
|
return nil, fmt.Errorf("TODO: multiqueue not implemented for ios")
|
|
}
|