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e8fa5ace35
This patch uses the /port 9P filesystem to set up and tear down port forwards on the host. Signed-off-by: David Scott <dave.scott@docker.com>
80 lines
1.7 KiB
Go
80 lines
1.7 KiB
Go
package main
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import (
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"errors"
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"fmt"
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"log"
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"net"
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"os"
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"pkg/proxy"
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"strings"
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)
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func main() {
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host, container := parseHostContainerAddrs()
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err := exposePort(host)
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if err != nil {
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sendError(err)
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}
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p, err := proxy.NewProxy(host, container)
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if err != nil {
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unexposePort(host)
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sendError(err)
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}
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go handleStopSignals(p)
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sendOK()
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p.Run()
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unexposePort(host)
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os.Exit(0)
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}
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func exposePort(host net.Addr) error {
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name := host.String()
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log.Printf("exposePort %s\n", name)
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err := os.Mkdir("/port/"+name, 0)
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if err != nil {
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log.Printf("Failed to mkdir /port/%s: %#v\n", name, err)
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return err
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}
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ctl, err := os.OpenFile("/port/"+name+"/ctl", os.O_RDWR, 0)
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if err != nil {
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log.Printf("Failed to open /port/%s/ctl: %#v\n", name, err)
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return err
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}
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_, err = ctl.WriteString(fmt.Sprintf("%s:%s", name, name))
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if err != nil {
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log.Printf("Failed to open /port/%s/ctl: %#v\n", name, err)
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return err
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}
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_, err = ctl.Seek(0, 0)
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if err != nil {
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log.Printf("Failed to seek on /port/%s/ctl: %#v\n", name, err)
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return err
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}
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results := make([]byte, 100)
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count, err := ctl.Read(results)
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if err != nil {
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log.Printf("Failed to read from /port/%s/ctl: %#v\n", name, err)
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return err
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}
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response := string(results[0:count])
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if strings.HasPrefix(response, "ERROR ") {
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os.Remove("/port/" + name + "/ctl")
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response = strings.Trim(response[6:], " \t\r\n")
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return errors.New(response)
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}
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// TODO: consider whether close/clunk of ctl would be a better tear down
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// signal
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return nil
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}
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func unexposePort(host net.Addr) {
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name := host.String()
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log.Printf("unexposePort %s\n", name)
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err := os.Remove("/port/" + name)
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if err != nil {
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log.Printf("Failed to remove /port/%s: %#v\n", name, err)
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}
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}
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