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// Copyright 2015 The Vanadium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package flags
import (
"net"
"strconv"
"v.io/v23/verror"
)
var (
errNotTCP = verror.Register(pkgPath+".errNotTCP", verror.NoRetry, "{1:}{2:} {3} is not a tcp protocol{:_}")
errCantParsePort = verror.Register(pkgPath+".errCantParsePort", verror.NoRetry, "{1:}{2:} failed to parse port number from {3}{:_}")
errNeedIPOrHostName = verror.Register(pkgPath+".errNeedIPOrHostName", verror.NoRetry, "{1:}{2:} {3} is neither an IP address nor a host name{:_}")
errBadIP = verror.Register(pkgPath+".errBadIP", verror.NoRetry, "{1:}{2:} failed to parse {3} as an IP address{:_}")
)
// TCPProtocolFlag implements flag.Value to provide validation of the command
// line values passed to it: tcp, tcp4, tcp6, ws, ws4, ws6, wsh, wsh4, and wsh6
// being the only allowed values.
type TCPProtocolFlag struct {
Protocol string
}
// Implements flag.Value.Get
func (t TCPProtocolFlag) Get() interface{} {
return t.Protocol
}
// Implements flag.Value.Set
func (t *TCPProtocolFlag) Set(s string) error {
switch s {
case "tcp", "tcp4", "tcp6", "ws", "ws4", "ws6", "wsh", "wsh4", "wsh6":
t.Protocol = s
return nil
default:
return verror.New(errNotTCP, nil, s)
}
}
// Implements flag.Value.String
func (t TCPProtocolFlag) String() string {
return t.Protocol
}
// IPHostPortFlag implements flag.Value to provide validation of the
// command line value it is set to. The allowed format is <host>:<port> in
// ip4 and ip6 formats. The host may be specified as a hostname or as an IP
// address (v4 or v6). If a hostname is used and it resolves to multiple IP
// addresses then all of those addresses are stored in IPHostPort.
type IPHostPortFlag struct {
Address string
Host string
IP []*net.IPAddr
Port string
}
// Implements flag.Value.Get
func (ip IPHostPortFlag) Get() interface{} {
return ip.String()
}
// Implements flag.Value.Set
func (ip *IPHostPortFlag) Set(s string) error {
if len(s) == 0 {
ip.Address, ip.Port, ip.Host = "", "", ""
return nil
}
ip.Address = s
host, port, err := net.SplitHostPort(s)
if err != nil {
// no port number in s.
host = s
ip.Port = "0"
} else {
// have a port in s.
if _, err := strconv.ParseUint(port, 10, 16); err != nil {
return verror.New(errCantParsePort, nil, s)
}
ip.Port = port
}
// if len(host) == 0 then we have no host, just a port.
if len(host) > 0 {
if addr := net.ParseIP(host); addr == nil {
// Could be a hostname.
addrs, err := net.LookupIP(host)
if err != nil || len(addrs) == 0 {
return verror.New(errNeedIPOrHostName, nil, host, err)
}
for _, a := range addrs {
ip.IP = append(ip.IP, &net.IPAddr{IP: a})
}
ip.Host = host
} else {
ip.IP = []*net.IPAddr{{IP: addr}}
}
return nil
}
return nil
}
// Implements flag.Value.String
func (ip IPHostPortFlag) String() string {
if len(ip.Address) == 0 && len(ip.Port) == 0 {
return ""
}
host := ip.Host
if len(ip.Host) == 0 && ip.IP != nil && len(ip.IP) > 0 {
// We don't have a hostname, so there should be at most one IP address.
host = ip.IP[0].String()
}
return net.JoinHostPort(host, ip.Port)
}
// IPFlag implements flag.Value in order to provide validation of
// IP addresses in the flag package.
type IPFlag struct{ net.IP }
// Implements flag.Value.Get
func (ip IPFlag) Get() interface{} {
return ip.IP
}
// Implements flag.Value.Set
func (ip *IPFlag) Set(s string) error {
t := net.ParseIP(s)
if t == nil {
return verror.New(errBadIP, nil, s)
}
ip.IP = t
return nil
}
// Implements flag.Value.String
func (ip IPFlag) String() string {
return ip.IP.String()
}