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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"
"io/ioutil"
"log"
"os"
"go.anytun.org/anygone/tuntap"
)
var (
al = log.New(os.Stdout, "[anygone]\t", log.LstdFlags)
adl = log.New(ioutil.Discard, "[anygone dbg]\t", log.LstdFlags)
)
func init() {
// if _, exists := os.LookupEnv("ANYGONE_DEBUG"); exists {
adl.SetOutput(os.Stderr)
// }
}
func main() {
cfg, err := NewConfig()
if err != nil {
fmt.Printf("Error while parsing commandline: %v\n\n", err)
cfg.PrintUsage()
os.Exit(2)
}
if cfg.Help {
cfg.PrintUsage()
os.Exit(0)
}
if cfg.Version {
cfg.PrintVersion()
os.Exit(0)
}
cfg.Dump()
al.Println("just started...")
dev, err := tuntap.NewDevice(cfg.DeviceType, cfg.DeviceName)
if err != nil {
al.Printf("Error while opening device: %v", err)
os.Exit(1)
}
al.Printf("Device '%s': opened", dev.Name())
if cfg.IFConfig.Valid {
if err = dev.AddAddress(cfg.IFConfig.Net); err != nil {
al.Printf("Error while configuring device: %v", err)
os.Exit(1)
}
al.Printf("Device '%s': added address %s", dev.Name(), cfg.IFConfig.Net.String())
}
if err = dev.SetMTU(1400); err != nil { // TODO: hardcoded value
al.Printf("Error while configuring device: %v", err)
os.Exit(1)
}
if err = dev.Up(); err != nil {
al.Printf("Error while configuring device: %v", err)
os.Exit(1)
}
if cfg.PostUp != "" {
al.Printf("Device '%s': running post-up script: %s", dev.Name(), cfg.PostUp)
if err = dev.RunPostUp(cfg.PostUp); err != nil {
al.Printf("Error while running post-up script: %v", err)
os.Exit(1)
}
al.Printf("Device '%s': post-up script returned 0", dev.Name())
}
for {
pkt, err := dev.ReadPacket()
if err != nil {
al.Printf("Error while reading packet from device: %v", err)
os.Exit(1)
}
payload := ""
for i, b := range pkt.Packet {
if i == 0 {
payload = fmt.Sprintf("{0x%02X", b)
} else {
payload = payload + fmt.Sprintf(", 0x%02X", b)
}
}
payload = payload + "}"
adl.Printf("got packet: Type {0x%04X}, Payload %s", pkt.Protocol, payload)
}
}
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