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libnetwork: setup DNS resolver without reexec

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Signed-off-by: Cory Snider <csnider@mirantis.com>
This commit is contained in:
Cory Snider 2022-10-31 17:19:07 -04:00
parent 4733127a04
commit 50a4951ddc
1 changed files with 35 additions and 78 deletions
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113
libnetwork/resolver_unix.go
View file

@ -4,22 +4,12 @@
package libnetwork
import (
"fmt"
"net"
"os"
"os/exec"
"runtime"
"github.com/docker/docker/libnetwork/iptables"
"github.com/docker/docker/pkg/reexec"
"github.com/sirupsen/logrus"
"github.com/vishvananda/netns"
)
func init() {
reexec.Register("setup-resolver", reexecSetupResolver)
}
const (
// outputChain used for docker embed dns
outputChain = "DOCKER_OUTPUT"
@ -27,79 +17,46 @@ const (
postroutingchain = "DOCKER_POSTROUTING"
)
func reexecSetupResolver() {
runtime.LockOSThread()
defer runtime.UnlockOSThread()
if len(os.Args) < 4 {
logrus.Error("invalid number of arguments..")
os.Exit(1)
}
resolverIP, ipPort, _ := net.SplitHostPort(os.Args[2])
_, tcpPort, _ := net.SplitHostPort(os.Args[3])
rules := [][]string{
{"-t", "nat", "-I", outputChain, "-d", resolverIP, "-p", "udp", "--dport", dnsPort, "-j", "DNAT", "--to-destination", os.Args[2]},
{"-t", "nat", "-I", postroutingchain, "-s", resolverIP, "-p", "udp", "--sport", ipPort, "-j", "SNAT", "--to-source", ":" + dnsPort},
{"-t", "nat", "-I", outputChain, "-d", resolverIP, "-p", "tcp", "--dport", dnsPort, "-j", "DNAT", "--to-destination", os.Args[3]},
{"-t", "nat", "-I", postroutingchain, "-s", resolverIP, "-p", "tcp", "--sport", tcpPort, "-j", "SNAT", "--to-source", ":" + dnsPort},
}
f, err := os.OpenFile(os.Args[1], os.O_RDONLY, 0)
if err != nil {
logrus.Errorf("failed get network namespace %q: %v", os.Args[1], err)
os.Exit(2)
}
defer f.Close() //nolint:gosec
nsFD := f.Fd()
if err = netns.Set(netns.NsHandle(nsFD)); err != nil {
logrus.Errorf("setting into container net ns %v failed, %v", os.Args[1], err)
os.Exit(3)
}
// TODO IPv6 support
iptable := iptables.GetIptable(iptables.IPv4)
// insert outputChain and postroutingchain
err = iptable.RawCombinedOutputNative("-t", "nat", "-C", "OUTPUT", "-d", resolverIP, "-j", outputChain)
if err == nil {
iptable.RawCombinedOutputNative("-t", "nat", "-F", outputChain)
} else {
iptable.RawCombinedOutputNative("-t", "nat", "-N", outputChain)
iptable.RawCombinedOutputNative("-t", "nat", "-I", "OUTPUT", "-d", resolverIP, "-j", outputChain)
}
err = iptable.RawCombinedOutputNative("-t", "nat", "-C", "POSTROUTING", "-d", resolverIP, "-j", postroutingchain)
if err == nil {
iptable.RawCombinedOutputNative("-t", "nat", "-F", postroutingchain)
} else {
iptable.RawCombinedOutputNative("-t", "nat", "-N", postroutingchain)
iptable.RawCombinedOutputNative("-t", "nat", "-I", "POSTROUTING", "-d", resolverIP, "-j", postroutingchain)
}
for _, rule := range rules {
if iptable.RawCombinedOutputNative(rule...) != nil {
logrus.Errorf("set up rule failed, %v", rule)
}
}
}
func (r *resolver) setupIPTable() error {
if r.err != nil {
return r.err
}
laddr := r.conn.LocalAddr().String()
ltcpaddr := r.tcpListen.Addr().String()
resolverIP, ipPort, _ := net.SplitHostPort(laddr)
_, tcpPort, _ := net.SplitHostPort(ltcpaddr)
rules := [][]string{
{"-t", "nat", "-I", outputChain, "-d", resolverIP, "-p", "udp", "--dport", dnsPort, "-j", "DNAT", "--to-destination", laddr},
{"-t", "nat", "-I", postroutingchain, "-s", resolverIP, "-p", "udp", "--sport", ipPort, "-j", "SNAT", "--to-source", ":" + dnsPort},
{"-t", "nat", "-I", outputChain, "-d", resolverIP, "-p", "tcp", "--dport", dnsPort, "-j", "DNAT", "--to-destination", ltcpaddr},
{"-t", "nat", "-I", postroutingchain, "-s", resolverIP, "-p", "tcp", "--sport", tcpPort, "-j", "SNAT", "--to-source", ":" + dnsPort},
}
cmd := &exec.Cmd{
Path: reexec.Self(),
Args: append([]string{"setup-resolver"}, r.resolverKey, laddr, ltcpaddr),
Stdout: os.Stdout,
Stderr: os.Stderr,
}
if err := cmd.Run(); err != nil {
return fmt.Errorf("reexec failed: %v", err)
}
return nil
return r.backend.ExecFunc(func() {
// TODO IPv6 support
iptable := iptables.GetIptable(iptables.IPv4)
// insert outputChain and postroutingchain
err := iptable.RawCombinedOutputNative("-t", "nat", "-C", "OUTPUT", "-d", resolverIP, "-j", outputChain)
if err == nil {
iptable.RawCombinedOutputNative("-t", "nat", "-F", outputChain)
} else {
iptable.RawCombinedOutputNative("-t", "nat", "-N", outputChain)
iptable.RawCombinedOutputNative("-t", "nat", "-I", "OUTPUT", "-d", resolverIP, "-j", outputChain)
}
err = iptable.RawCombinedOutputNative("-t", "nat", "-C", "POSTROUTING", "-d", resolverIP, "-j", postroutingchain)
if err == nil {
iptable.RawCombinedOutputNative("-t", "nat", "-F", postroutingchain)
} else {
iptable.RawCombinedOutputNative("-t", "nat", "-N", postroutingchain)
iptable.RawCombinedOutputNative("-t", "nat", "-I", "POSTROUTING", "-d", resolverIP, "-j", postroutingchain)
}
for _, rule := range rules {
if iptable.RawCombinedOutputNative(rule...) != nil {
logrus.Errorf("set up rule failed, %v", rule)
}
}
})
}