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listener.go
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/
listener.go
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package utils
import (
"crypto/tls"
"fmt"
"net"
"os"
"strings"
"syscall"
)
// GetListener get a listener for an address.
func GetListener(addr string, tlsConfig *tls.Config) (net.Listener, error) {
addrParts := strings.SplitN(addr, "://", 2)
if len(addrParts) != 2 {
return nil, fmt.Errorf("invalid listening address %s: must be in format [protocol]://[address]", addr)
}
switch addrParts[0] {
case "tcp":
l, err := net.Listen("tcp", addrParts[1])
if err != nil {
return l, err
}
if tlsConfig != nil {
l = tls.NewListener(l, tlsConfig)
}
return l, err
case "unix":
return newUnixSocket(addrParts[1])
default:
return nil, fmt.Errorf("only unix socket or tcp address is support")
}
}
func newUnixSocket(path string) (net.Listener, error) {
if err := syscall.Unlink(path); err != nil && !os.IsNotExist(err) {
return nil, err
}
oldmask := syscall.Umask(0777)
defer syscall.Umask(oldmask)
l, err := net.Listen("unix", path)
if err != nil {
return nil, err
}
// chmod unix socket, make other group writable
if err := os.Chmod(path, 0660); err != nil {
l.Close()
return nil, fmt.Errorf("failed to chmod %s: %s", path, err)
}
gid, err := ParseID(GroupFile, "wasmer", func(line, str string, idInt int, idErr error) (uint32, bool) {
var (
name, placeholder string
id int
)
ParseString(line, &name, &placeholder, &id)
if str == name {
return uint32(id), true
}
return 0, false
})
if err != nil {
// ignore error when group wasmer not exist, group wasmer should to be
// created before wasmerd started, it means code not create wasmer group
fmt.Printf("failed to find group wasmer, cannot change unix socket %s to wasmer group", path)
return l, nil
}
// chown unix socket with group wasmer
if err := os.Chown(path, 0, int(gid)); err != nil {
l.Close()
return nil, fmt.Errorf("failed to chown %s: %s", path, err)
}
return l, nil
}