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DTN Reference Implementation

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DTN Reference Implementation
============================

This is the Delay Tolerant Networking reference implementation.

See the file STATUS for an overview of the state of the code, particularly in reference to the various internet drafts and (someday) RFCs that describe the bundling protocol.

Also, the file RELEASE-NOTES describes major changes in each release.

Compilation / Installation Instructions
---------------------------------------

```
./configure -C
make
make install
```

Note that by default, the configure script will also run configure
inside the oasys/ subdirectory. The -C argument enables the autoconf
variable cache, which speeds up configuration.

Note that if you need to make changes to the `configure.ac` script or
one of the helper scripts in `aclocal/*.ac`, run `build-configure.sh` to
recreate `configure` and then check in both your changes as well as the
newly generated configure script.

Getting Started
---------------

A good place to start for playing around with DTN is to look at the
manual and tutorials (see doc/manual/index.html). This set of
documentation explains some of the configuration and applications. If
you find omissions or errors, please feel free to post updates and
corrections to dtn-users@mailman.dtnrg.org.

Reporting Bugs / Other Help
---------------------------

Open a Github Issue or Pull Request.

Formerly the bug reports were hosted at sourceforge at: http://sourceforge.net/tracker/?group_id=101657&atid=630167 and/or direct questions to dtn-bugs@mailman.dtnrg.org.

Directory Structure
------------------------

```
applib/         application interface library and ipc layer
apps/           example dtn applications
doc/            documentation
daemon/         dtn router daemon sources
ideas/          temporary code idea repository
servlib/        dtn router internals
|-- bundling    bundle management and forwarding logic
|-- cmd         tcl based command interface
|-- contacts
|-- conv_layers convergence layers
|-- discovery
|-- gcm
|-- naming      endpoint identifier schemes
|-- prophet     prophet router
|-- reg         local registrations
|-- routing     bundle routing logic
|-- security    bundle security protocol
|-- session     session layer
`-- storage     persistent storage management
sim/            simulation framework
test/           unit tests and other test files
test-utils/     test scripts and utilities

```
External Requirements
---------------------

* oasys-1.3.0+ (see Note - Oasys)
* gcc/g++

Optional External Packages
--------------------------
* bonjour

Optional Internal Packages
--------------------------
* NORM convergence layer support
* Bundle Security Protocol support (see Note BSP)
* LTP convergence layer support via TCD's LTPlib
* Internet Draft Compliant IP Neighbor Discovery (see README.IPND)

Note - Oasys
--------------------------
Before compiling DTN2 please compile Oasys-1.3.0+ (must be installed or located in DTN2 or ../). Support for the following DTN2 options should be specified when configuring oasys:

Required:

* Python
* tcl
* google perftools
* expat
* xerces-c
* xsd tool
* Berkeley DB
* mysql
* postgres

Optional dependencies

* bluetooth
* zlib
* tclreadline
* profiling
* google profiling
* assembly-based atomic functions

Enable or disable:

* oasys debugging
* oasys memory debugging
* oasys lock debugging
* oasys optimization

Note - BSP
--------------------------
The standard ciphersuites require, amongst other things, an implementation of sha-256 message digest algorithm.

The DTN reference code uses OpenSSL for cryptographic and related functions. Unfortunately, some versions of OpenSSL do not include sha-256.

The "configure" process checks for the availability of sha-256 and provides an error if it is not found.

If your system's OpenSSL does not have sha-256 then you can either upgrade it or build and use a local version of OpenSSL. OpenSSL can be obtained from http://www.openssl.org

OpenSSL 0.9.8 version include sha-256 by default. If your system uses version 0.9.7 and you do not wish to upgrade then you can enable sha-256 in later versions of 0.9.7, such as 0.9.7l and 0.9.7m. To enable sha-256, specify "fips" when running "Configure".

If you wish to leave you system installation untouched and build against a local version, then configure dtn using ./configure --with-bsp --with-openssl=/path/to/openssl

Mac OS X note: for Mac OS X users ONLY. If you build dtn
against a local OpenSSL using "--with-openssl=/path/to/openssl"
you MUST also specify with it LDFLAGS="-Wl,-search_paths_first".
The configuration for OS X users would then be
./configure --with-bsp --with-openssl=/path/to/openssl LDFLAGS="-Wl,-search_paths_first"
Note that the quotes are required for the LDFLAGS argument.

Note - LTP
----------------------------

This is an initial test of TCD's LTPlib as a CL. To use it go get LTPlib (todo: add URL!) and then ./configure --with-ltp

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