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//
// Copyright (c) 2017 anygone contributors (see AUTHORS file)
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
//
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// * Neither the name of anygone nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
package main
import (
"fmt"
"net"
"os"
"path/filepath"
"strings"
"github.com/spf13/pflag"
)
type IPAddrCIDR struct {
Net net.IPNet
Valid bool
}
func (ipnet IPAddrCIDR) String() string {
if ipnet.Valid {
return ipnet.Net.String()
}
return ""
}
func (ipnet *IPAddrCIDR) Set(value string) error {
ip, net, err := net.ParseCIDR(strings.TrimSpace(value))
if err != nil {
return err
}
net.IP = ip
*ipnet = IPAddrCIDR{*net, true}
return nil
}
func (*IPAddrCIDR) Type() string {
return "ipNet"
}
type Config struct {
name string
flags *pflag.FlagSet
Help bool
Version bool
DeviceName string
DeviceType string
IFConfig IPAddrCIDR
PostUp string
}
func (cfg *Config) PrintUsage() {
cfg.flags.Usage()
}
func (cfg *Config) PrintVersion() {
fmt.Println("anygone version 0.1")
}
func (cfg *Config) Dump() {
fmt.Printf("Config: %+v\n", cfg)
}
func (cfg *Config) parsePost() error {
extraArgs := cfg.flags.Args()
if len(extraArgs) > 0 {
return fmt.Errorf("unknown additional parameters (%s)", strings.Join(extraArgs, ", "))
}
if cfg.DeviceName == "" && cfg.DeviceType == "" {
cfg.DeviceType = "tun"
}
return nil
}
func NewConfig() (cfg *Config, err error) {
cfg = &Config{}
cfg.name = filepath.Base(os.Args[0])
cfg.flags = pflag.NewFlagSet(cfg.name, pflag.ContinueOnError)
cfg.flags.SetInterspersed(false)
cfg.flags.SortFlags = false
cfg.flags.Usage = func() {
fmt.Fprintf(os.Stderr, "Usage of %s:\n", cfg.name)
cfg.flags.PrintDefaults()
}
cfg.flags.BoolVarP(&cfg.Help, "help", "h", false, "print this...")
cfg.flags.BoolVarP(&cfg.Version, "version", "v", false, "print version info and exit")
cfg.flags.StringVarP(&cfg.DeviceName, "dev", "d", "", "device name")
cfg.flags.StringVarP(&cfg.DeviceType, "type", "t", "", "device type")
cfg.flags.VarP(&cfg.IFConfig, "ifconfig", "n", "the local address for the tun/tap device and the used prefix length")
cfg.flags.StringVarP(&cfg.PostUp, "post-up-script", "x", "", "script gets called after interface is created")
if err = cfg.flags.Parse(os.Args[1:]); err != nil {
return
}
err = cfg.parsePost()
return
}
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