https://github.com/blorticus/gtpv2

GPRS Tunneling Protocol Library for golang
https://github.com/blorticus/gtpv2

Last synced: 25 days ago
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GPRS Tunneling Protocol Library for golang

• Host: GitHub
• URL: https://github.com/blorticus/gtpv2
• Owner: blorticus
• License: apache-2.0
• Created: 2019-09-16T09:52:16.000Z (about 5 years ago)
• Default Branch: master
• Last Pushed: 2021-09-20T13:44:12.000Z (about 3 years ago)
• Last Synced: 2024-08-05T00:04:35.773Z (4 months ago)
• Language: Go
• Size: 84 KB
• Stars: 7
• Watchers: 2
• Forks: 3
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

• awesome-5g - gtpv2 - GPRS Tunneling Protocol Library for golang. (Protocols / GTP)

README

        
# Overview

This package provides a module for the GPRS Tunnel Protocol (GTP) version 2.  GTPv2 is documented in [3GPP TS 29.274](https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=1692).

# Installation

```bash

go get github.com/blorticus/gtpv2

```

# Basic Usage

```golang

package main

import (

    gtpv2 "github.com/blorticus/gtpv2"

    "net"

    "fmt"

)

func main() {

    modifyBearerRequest := gtpv2.NewPDU(gtpv2.ModifyBearerRequest, 0x00001acc, []*gtpv2.IE{

        gtpv2.NewIEWithRawData(gtpv2.UserLocationInformation, []byte{

                0x18, 0x00, 0x11, 0x00, 0xff, 0x00, 0x00, 0x11,

                0x00, 0x0f, 0x42, 0x4d, 0x00,

        }),

        gtpv2.NewIEWithRawData(gtpv2.RATType, []byte{0x06}),

        gtpv2.NewIEWithRawData(gtpv2.DelayValue, []byte{0x00}),

        gtpv2.NewIEWithRawData(gtpv2.BearerContext, []byte{

                0x49, 0x00, 0x01, 0x00, 0x05, 0x57, 0x00, 0x09,

                0x00, 0x80, 0xe4, 0x03, 0xfb, 0x94, 0xac, 0x13,

                0x01, 0xb2,

        }),

        gtpv2.NewIEWithRawData(gtpv2.RecoveryRestartCounter, []byte{0x95}),

    })

    

    conn, err := net.Dial("udp", "10.1.10.10:2123")

    if err != nil {

        panic(err)

    }

    

    conn.Write(modifyBearerRequest.Encode())

    

    incomingByteStream := make([]byte, 65536)

    

    dgLength, err := conn.Read(incomingByteStream)

    if err != nil {

        panic(err)

    }

    

    incomingGtpPDU, piggybackedGtpPDU, err := gtpv2.DecodePDU(incomingByteStream[:dgLength])

    if err != nil {

        panic(err)

    }

    

    for _, ie := range incomingGtpPDU.InformationElements {

        fmt.Printf("IE name = (%s), value = (%02x)\n", gtpv2.NameOfIEForType(ie.Type), ie.Data)

    }

}

```

# Information Elements

There is no support for interpretation of Information Elements.  They are created, stored, and presented as

a byte stream.  So, for example, when one uses the IMSI IE, it is not decoded to its natural string representation.

```