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5202f95604
Rather than re-execing docker as the proxy, create a new command docker-proxy that is much smaller to save memory in the case where there are a lot of procies being created. Also allows the proxy to be replaced, for example in Docker for Mac we have a proxy that proxies to osx instead of locally. This is the vendoring pull for https://github.com/docker/docker/pull/23312 Signed-off-by: Justin Cormack <justin.cormack@docker.com>
67 lines
1.5 KiB
Go
67 lines
1.5 KiB
Go
package main
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import (
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"flag"
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"fmt"
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"log"
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"net"
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"os"
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"os/signal"
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"syscall"
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)
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func main() {
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f := os.NewFile(3, "signal-parent")
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host, container := parseHostContainerAddrs()
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p, err := NewProxy(host, container)
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if err != nil {
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fmt.Fprintf(f, "1\n%s", err)
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f.Close()
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os.Exit(1)
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}
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go handleStopSignals(p)
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fmt.Fprint(f, "0\n")
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f.Close()
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// Run will block until the proxy stops
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p.Run()
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}
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// parseHostContainerAddrs parses the flags passed on reexec to create the TCP or UDP
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// net.Addrs to map the host and container ports
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func parseHostContainerAddrs() (host net.Addr, container net.Addr) {
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var (
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proto = flag.String("proto", "tcp", "proxy protocol")
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hostIP = flag.String("host-ip", "", "host ip")
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hostPort = flag.Int("host-port", -1, "host port")
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containerIP = flag.String("container-ip", "", "container ip")
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containerPort = flag.Int("container-port", -1, "container port")
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)
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flag.Parse()
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switch *proto {
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case "tcp":
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host = &net.TCPAddr{IP: net.ParseIP(*hostIP), Port: *hostPort}
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container = &net.TCPAddr{IP: net.ParseIP(*containerIP), Port: *containerPort}
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case "udp":
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host = &net.UDPAddr{IP: net.ParseIP(*hostIP), Port: *hostPort}
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container = &net.UDPAddr{IP: net.ParseIP(*containerIP), Port: *containerPort}
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default:
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log.Fatalf("unsupported protocol %s", *proto)
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}
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return host, container
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}
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func handleStopSignals(p Proxy) {
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s := make(chan os.Signal, 10)
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signal.Notify(s, os.Interrupt, syscall.SIGTERM)
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for range s {
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p.Close()
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os.Exit(0)
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}
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}
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