mirror of
https://github.com/linuxkit/linuxkit.git
synced 2025-12-03 08:25:46 +00:00
c24687e2e1
- don't try to create a `FileConn` because the Go library sees through the scam and rejects it - explicitly keep a reference to the `ctl` file just in case the GC decides its dead and should be closed. Signed-off-by: David Scott <dave.scott@docker.com>
75 lines
1.7 KiB
Go
75 lines
1.7 KiB
Go
package main
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"log"
|
|
"net"
|
|
"os"
|
|
"libproxy"
|
|
"strings"
|
|
"vsock"
|
|
)
|
|
|
|
func main() {
|
|
host, port, container := parseHostContainerAddrs()
|
|
|
|
ctl, err := exposePort(host, port)
|
|
if err != nil {
|
|
sendError(err)
|
|
}
|
|
|
|
p, err := libproxy.NewProxy(&vsock.VsockAddr{Port: uint(port)}, container)
|
|
if err != nil {
|
|
sendError(err)
|
|
}
|
|
|
|
go handleStopSignals(p)
|
|
sendOK()
|
|
p.Run()
|
|
ctl.Close() // ensure ctl remains alive and un-GCed until here
|
|
os.Exit(0)
|
|
}
|
|
|
|
func exposePort(host net.Addr, port int) (*os.File, error) {
|
|
name := host.String()
|
|
log.Printf("exposePort %s\n", name)
|
|
err := os.Mkdir("/port/"+name, 0)
|
|
if err != nil {
|
|
log.Printf("Failed to mkdir /port/%s: %#v\n", name, err)
|
|
return nil, err
|
|
}
|
|
ctl, err := os.OpenFile("/port/"+name+"/ctl", os.O_RDWR, 0)
|
|
if err != nil {
|
|
log.Printf("Failed to open /port/%s/ctl: %#v\n", name, err)
|
|
return nil, err
|
|
}
|
|
_, err = ctl.WriteString(fmt.Sprintf("%s:%08x", name, port))
|
|
if err != nil {
|
|
log.Printf("Failed to open /port/%s/ctl: %#v\n", name, err)
|
|
return nil, err
|
|
}
|
|
_, err = ctl.Seek(0, 0)
|
|
if err != nil {
|
|
log.Printf("Failed to seek on /port/%s/ctl: %#v\n", name, err)
|
|
return nil, err
|
|
}
|
|
results := make([]byte, 100)
|
|
count, err := ctl.Read(results)
|
|
if err != nil {
|
|
log.Printf("Failed to read from /port/%s/ctl: %#v\n", name, err)
|
|
return nil, err
|
|
}
|
|
// We deliberately keep the control file open since 9P clunk
|
|
// will trigger a shutdown on the host side.
|
|
|
|
response := string(results[0:count])
|
|
if strings.HasPrefix(response, "ERROR ") {
|
|
os.Remove("/port/" + name + "/ctl")
|
|
response = strings.Trim(response[6:], " \t\r\n")
|
|
return nil, errors.New(response)
|
|
}
|
|
// Hold on to a reference to prevent premature GC and close
|
|
return ctl, nil
|
|
}
|