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unix.go
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unix.go
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// Copyright (C) 2022 Andrew Ayer
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
// OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
//
// Except as contained in this notice, the name(s) of the above copyright
// holders shall not be used in advertising or otherwise to promote the
// sale, use or other dealings in this Software without prior written
// authorization.
package main
import (
"errors"
"fmt"
"io/fs"
"net"
"path/filepath"
)
type UnixDialer struct {
Directory string
}
func (backend *UnixDialer) Dial(origHostname string, protocols []string, clientConn ClientConn) (BackendConn, error) {
hostname, err := canonicalizeHostname(origHostname)
if err != nil {
return nil, fmt.Errorf("invalid hostname %q", origHostname)
}
if conn, err := backend.dial(hostname); err == nil {
return conn, nil
} else if !errors.Is(err, fs.ErrNotExist) {
return nil, err
}
if conn, err := backend.dial(wildcardHostname(hostname)); err == nil {
return conn, nil
} else if !errors.Is(err, fs.ErrNotExist) {
return nil, err
}
return nil, fmt.Errorf("no backend socket found for %q", hostname)
}
func (backend *UnixDialer) dial(socketName string) (BackendConn, error) {
socketPath := filepath.Join(backend.Directory, socketName)
return net.DialUnix("unix", nil, &net.UnixAddr{Net: "unix", Name: socketPath})
}