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wgengine/netstack: add netstack port rewriting mechanism

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Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2021-05-13 20:57:41 -07:00
parent 6f62bbae79
commit 3579452856
1 changed files with 4 additions and 0 deletions
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4
wgengine/netstack/netstack.go
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@ -12,6 +12,7 @@ import (
"io"
"log"
"net"
"os"
"strconv"
"strings"
"sync"
@ -452,6 +453,9 @@ func (ns *Impl) acceptTCP(r *tcp.ForwarderRequest) {
func (ns *Impl) forwardTCP(client *gonet.TCPConn, wq *waiter.Queue, dialAddr tcpip.Address, dialPort uint16) {
defer client.Close()
dialAddrStr := net.JoinHostPort(dialAddr.String(), strconv.Itoa(int(dialPort)))
if alt := os.Getenv(fmt.Sprintf("TAILSCALE_INCOMING_REMAP_%s_%d", dialAddr, dialPort)); alt != "" {
dialAddrStr = alt
}
ns.logf("[v2] netstack: forwarding incoming connection to %s", dialAddrStr)
ctx, cancel := context.WithCancel(context.Background())
defer cancel()