VERSION 1.1.6: route management, default route override, new IPv6 mode for Docker, and more!

(Retagged due to silly one-line bug and left over debug line... doh!)

Version 1.1.6 contains several significant improvements for use in complex network
environments along with some minor bug fixes and improvements to path stability and
dead path detection.

ROUTE MANAGEMENT AND FULL TUNNEL SUPPORT

1.1.6 is the first version of ZeroTier One to permit "full tunnel" (default route
override) operation on Linux, Mac, and Windows. This allows all Internet traffic
to be tunneled through ZeroTier while allowing ZeroTier peer-to-peer traffic to
continue to use the physical interface. 1.1.6 also brings route management support
and permissions settings for local networks to control whether networks are allowed
to modify the routing table or override default routing.

This is currently considered a beta/experimental feature and must be enabled via
the command line interface.

Route management and default route override requires support at the network controller.
When my.zerotier.com is updated and ready, we will post more information and testing
instructions at: https://www.zerotier.com/community

HIGHLY SCALABLE CONTAINER NETWORKING

1.1.6 also brings a new multicast-free (NDP emulated) IPv6 private addressing scheme
called "6plane." 6plane provides each host with a private IPv6 /80 and routes *all*
IPv6 traffic for this subnet to the host via transparent NDP emulation. This /80 can
then be assigned to Docker or other container/VM managers to assign a network-wide
IPv6 /128 to every container. Since NDP is emulated and multicast isn't needed, this
system can scale to millions of containers or more on a single backplane network with
a high degree of efficiency and reliability.

6plane also requires controller support. Look for it at my.zerotier.com once we have
upgraded our core infrastructure and web UIs.

(All hosts must be running 1.1.6 for 6plane to work properly. Other IPv6 addresses
or addressing modes are not affected and normal IPv6 NDP will continue to work
alongside 6plane in the same network.)

OTHER CHANGES

 * Upgraded bundled miniupnpc, libnatpmp, and http-parser.
 * New Debian and RPM packaging that is closer to compliance with distribution
   guidelines, and a new Dockerized Linux package build system in linux-build-farm/
   that can build every package on actual images of the correct distribution.
 * Improvements to dead path detection.
 * IPv6 now uses keepalive because a significant number of stateful IPv6 edge
   routers have very short timeouts (30 seconds or less!).
 * Significant performance improvements to network controllers under high load.
 * Enable -fstack-protector-strong for better stack canary (security) support
   in binaries. Note that this may require newer gcc/g++ or clang.

COMING SOON

The next version of ZeroTier One should have a new Mac UI. It's a system tray app
that looks and behaves a lot like the Mac WiFi pulldown menu. We'll also be adding
GUI support for default route and route management options and other new features.

Shortly after that we plan on adding full OpenFlow-like SDN rules engine support
to the ZeroTier core, making our planetary Ethernet switch a fully manageable smart
switch and enabling sophisticated security and flow rule management.

.gitignore

@@ -1,5 +1,9 @@
 # Main binaries created in *nix builds
-/zerotier-*
+/zerotier-one
+/zerotier-idtool
+/zerotier-cli
+/zerotier-selftest
+/zerotier
 
 # OS-created garbage files from various platforms
 .DS_Store
@@ -29,8 +33,13 @@ Thumbs.db
 # *nix/Mac build droppings
 /build-*
 /ZeroTierOneInstaller-*
+/examples/docker/zerotier-one
+/examples/docker/test-*.env
+/world/mkworld
+/world/*.c25519
+zt1-src.tar.gz
 
-# Miscellaneous file types that we don't want to check in
+# Miscellaneous temporaries, build files, etc.
 *.log
 *.opensdf
 *.user
@@ -40,27 +49,26 @@ Thumbs.db
 *.pid
 *.pkg
 *.o
+*.a
+*.dylib
+*.so
+*.so.*
+*.o-*
 *.core
 *.deb
 *.rpm
 *.autosave
 *.tmp
-
-# Root topology build files, temporaries, and never check in secrets
-/root-topology/bin2c
-/root-topology/mktopology
-/root-topology/*.secret
-/root-topology/test/supernodes
-/root-topology/test/test-root-topology
-
-# MacGap wrapper build files
-/ext/mac-ui-macgap1-wrapper/src/MacGap.xcodeproj/project.xcworkspace/xcuserdata/*
-/ext/mac-ui-macgap1-wrapper/src/MacGap.xcodeproj/xcuserdata/*
-/ext/mac-ui-macgap1-wrapper/src/build
-
-# Web UI dev temporaries
-/ui/.module-cache
+doc/*.1
+doc/*.2
+doc/*.8
+.depend
 node_modules
+debian/files
+debian/zerotier-one
+debian/zerotier-one*.debhelper
+debian/*.log
+debian/zerotier-one.substvars
 
 # Java/Android/JNI build droppings
 java/obj/
@@ -71,3 +79,6 @@ java/doc/
 java/build_win64/
 java/build_win32/
 /java/mac32_64/
+windows/WinUI/obj/
+windows/WinUI/bin/
+windows/ZeroTierOne/Debug/

AUTHORS.md

@@ -1,44 +1,80 @@
-## Authors
+## Primary Authors
 
- * ZeroTier protocol design and core network virtualization engine, ZeroTier One service, React web UI, packaging for most platforms, kitchen sink...<br>
+ * ZeroTier Core and ZeroTier One virtual networking service<br>
    Adam Ierymenko / adam.ierymenko@zerotier.com
 
  * Java JNI Interface to enable Android application development, and Android app itself (code for that is elsewhere)<br>
    Grant Limberg / glimberg@gmail.com
 
-## Contributors
+ * ZeroTier SDK (formerly known as Network Containers)<br>
+   Joseph Henry / joseph.henry@zerotier.com
+
+## Third Party Contributors
 
  * A number of fixes and improvements to the new controller, other stuff.<br>
-   Kees Bos / https://github.com/keesbos
+   Kees Bos / https://github.com/keesbos/
 
  * Debugging and testing, OpenWRT support fixes.<br>
    Moritz Warning / moritzwarning@web.de
 
+ * Debian GNU/Linux packaging, manual pages, and license compliance edits.<br>
+   Ben Finney <ben+zerotier@benfinney.id.au>
+
  * Several others made smaller contributions, which GitHub tracks here:<br>
-   https://github.com/zerotier/ZeroTierOne/graphs/contributors
+   https://github.com/zerotier/ZeroTierOne/graphs/contributors/
 
-## Third Party Code
+## Third-Party Code
 
- * LZ4 compression algorithm by Yann Collet (BSD license)<br>
-   http://code.google.com/p/lz4/
+These are included in ext/ for platforms that do not have them available in common repositories. Otherwise they may be linked and the package may ship with them as dependencies.
 
- * http-parser by many authors (MIT license)<br>
-   https://github.com/joyent/http-parser
+ * LZ4 compression algorithm by Yann Collet
 
- * json-parser by James McLaughlin (BSD license)<br>
-   https://github.com/udp/json-parser
+   * Files: ext/lz4/*
+   * Home page: http://code.google.com/p/lz4/
+   * License grant: BSD attribution
 
- * TunTapOSX by Mattias Nissler (BSD license)<br>
-   http://tuntaposx.sourceforge.net
+ * http-parser by Joyent, Inc. (many authors)
 
- * tap-windows and tap-windows6 by the OpenVPN project (GPL)<br>
-   https://github.com/OpenVPN/tap-windows<br>
-   https://github.com/OpenVPN/tap-windows6
+   * Files: ext/http-parser/*
+   * Home page: https://github.com/joyent/http-parser/
+   * License grant: MIT/Expat
+
+ * json-parser by James McLaughlin
+
+   * Files: ext/json-parser/*
+   * Home page: https://github.com/udp/json-parser/
+   * License grant: BSD attribution
+
+ * TunTapOSX by Mattias Nissler
+
+   * Files: ext/tap-mac/tuntap/*
+   * Home page: http://tuntaposx.sourceforge.net/
+   * License grant: BSD attribution no-endorsement
+   * ZeroTier Modifications: change interface name to zt#, increase max MTU, increase max devices
+
+ * tap-windows6 by the OpenVPN project
+
+   * Files: windows/TapDriver6/*
+   * Home page:
+       https://github.com/OpenVPN/tap-windows6/
+   * License grant: GNU GPL v2
+   * ZeroTier Modifications: change name of driver to ZeroTier, add ioctl() to get L2 multicast memberships (source is in ext/ and modifications inherit GPL)
 
  * Salsa20 stream cipher, Curve25519 elliptic curve cipher, Ed25519
    digital signature algorithm, and Poly1305 MAC algorithm, all by
-   Daniel J. Bernstein (public domain)<br>
-   http://cr.yp.to/
+   Daniel J. Bernstein
 
- * MiniUPNPC by Thomas Bernard [BSD]
-   http://miniupnp.free.fr
+   * Files:
+       node/Salsa20.hpp
+       node/C25519.hpp
+       node/Poly1305.hpp
+   * Home page: http://cr.yp.to/
+   * License grant: public domain
+
+ * MiniUPNPC and libnatpmp by Thomas Bernard
+
+   * Files:
+       ext/libnatpmp/*
+       ext/miniupnpc/*
+   * Home page: http://miniupnp.free.fr/
+   * License grant: BSD attribution no-endorsement

COPYING

@@ -0,0 +1,17 @@
+ZeroTier One, an endpoint server for the ZeroTier virtual network layer.
+Copyright © 2011–2016 ZeroTier, Inc.
+
+ZeroTier One is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3 of the License, or (at
+your option) any later version.
+
+See the file ‘LICENSE.GPL-3’ for the text of the GNU GPL version 3.
+If that file is not present, see <http://www.gnu.org/licenses/>.
+
+..
+    Local variables:
+    coding: utf-8
+    mode: text
+    End:
+    vim: fileencoding=utf-8 filetype=text :

LICENSE.GPL-2

@@ -0,0 +1,339 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 2, June 1991
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LICENSE.txt

@@ -1,13 +0,0 @@
-ZeroTier One is licensed under the terms of the GNU General Public License
-version 3, which are available here:
-
-http://gplv3.fsf.org/
-
-Modification and redistribution of ZeroTier One is permitted in source form.
-Binary distribution is permitted provided all copyright notices remain
-intact and any modifications to the source code are also distributed.
-
-ZeroTier One may not be embedded into any closed-source application (e.g. via
-linking), nor may closed-source derivatives be created, without a separately
-negotiated license from ZeroTier Networks LLC. See the terms of the GPLv3 for
-details.

README.md

@@ -1,35 +1,51 @@
-ZeroTier One
+ZeroTier - A Planetary Ethernet Switch
 ======
 
-ZeroTier is a software defined networking layer for Earth.
+ZeroTier is a software-based managed Ethernet switch for planet Earth.
 
-It can be used for on-premise network virtualization, as a peer to peer VPN for mobile teams, for hybrid or multi-data-center cloud deployments, or just about anywhere else secure software defined virtual networking is useful.
+It erases the LAN/WAN distinction and makes VPNs, tunnels, proxies, and other kludges arising from the inflexible nature of physical networks obsolete. Everything is encrypted end-to-end and traffic takes the most direct (peer to peer) path available.
 
-ZeroTier One is our OS-level client service. It allows Mac, Linux, Windows, FreeBSD, and soon other types of clients to join ZeroTier virtual networks like conventional VPNs or VLANs. It can run on native systems, VMs, or containers (Docker, OpenVZ, etc.).
+This repository contains ZeroTier One, a service that provides ZeroTier network connectivity to devices running Windows, Mac, Linux, iOS, Android, and FreeBSD and makes joining virtual networks as easy as joining IRC or Slack channels. It also contains the OS-independent core ZeroTier protocol implementation in [node/](node/).
 
-Visit [ZeroTier's site](https://www.zerotier.com/) for more information. You can also download professionally packaged binary installers/packages for a variety of supported OSes there if you don't want to build ZeroTier One from source.
+Visit [ZeroTier's site](https://www.zerotier.com/) for more information and [pre-built binary packages](https://www.zerotier.com/download.shtml). Apps for Android and iOS are available for free in the Google Play and Apple app stores.
+
+### Getting Started
+
+ZeroTier's basic operation is easy to understand. Devices have 10-digit *ZeroTier addresses* like `89e92ceee5` and networks have 16-digit network IDs like `8056c2e21c000001`. All it takes for a device to join a network is its 16-digit ID, and all it takes for a network to authorize a device is its 10-digit address. Everything else is automatic.
+
+A "device" can be anything really: desktops, laptops, phones, servers, VMs/VPSes, containers, and even (soon) apps.
+
+For testing we provide a public virtual network called *Earth* with network ID `8056c2e21c000001`. On Linux and Mac you can do this with:
+
+    sudo zerotier-cli join 8056c2e21c000001
+
+Now wait about 30 seconds and check your system with `ip addr list` or `ifconfig`. You'll see a new interface whose name starts with *zt* and it should quickly get an IPv4 and an IPv6 address. Once you see it get an IP, try pinging `earth.zerotier.net` at `29.209.112.93`. If you've joined Earth from more than one system, try pinging your other machine.
+
+*(IPv4 addresses for Earth are assigned from the block 28.0.0.0/7, which is not a part of the public Internet but is non-standard for private networks. It's used to avoid IP conflicts during testing. Your networks can run any IP addressing scheme you want.)*
+
+If you don't want to belong to a giant Ethernet party line anymore, just type:
+
+    sudo zerotier-cli leave 8056c2e21c000001
+
+The *zt* interface will disappear. You're no longer on the network.
+
+To create networks of your own you'll need a network controller. You can use [our hosted controller at my.zerotier.com](https://my.zerotier.com) which is free for up to 100 devices on an unlimited number of networks, or you can build your own controller and run it through its local JSON API. See [README.md in controller/](controller/) for more information.
 
 ### Building from Source
 
 For Mac, Linux, and BSD, just type "make" (or "gmake" on BSD). You won't need much installed; here are the requirements for various platforms:
 
- * Mac: Xcode command line tools, and [Packages](http://s.sudre.free.fr/Software/Packages/about.html) if you want to build an OSX .pkg installer ("make mac-dist-pkg"). It should build on OSX 10.7 or newer.
- * Linux: gcc/g++ or clang/clang++ (Makefile will use clang by default if available.)
- * FreeBSD (and other BSD): C++ compiler (G++ usually) and GNU make (gmake).
+ * **Mac**: Xcode command line tools. It should build on OSX 10.7 or newer.
+ * **Linux**: gcc/g++ (4.9 or newer recommended) or clang/clang++ (3.4 or newer recommended) Makefile will use clang by default if available. The Linux build will auto-detect the presence of development headers for *json-parser*, *http-parser*, *li8bnatpmp*, and *libminiupnpc* and will link against the system libraries for these if they are present and recent enough. Otherwise the bundled versions in [ext/](ext/) will be used. Type `make install` to install the binaries and other files on the system, though this will not create init.d or systemd links.
+ * **FreeBSD**: C++ compiler (G++ usually) and GNU make (gmake).
 
 Each supported platform has its own *make-XXX.mk* file that contains the actual make rules for the platform. The right .mk file is included by the main Makefile based on the GNU make *OSTYPE* variable. Take a look at the .mk file for your platform for other targets, debug build rules, etc.
 
-Windows, of course, is special. We build for Windows with Microsoft Visual Studio 2012 on Windows 7. A solution file is located in the *windows* subfolder. Newer versions of Visual Studio (and Windows) may work but haven't been tested. Older versions almost certainly will not, since they lack things like *stdint.h* and certain STL features. MinGW or other ports of gcc/clang to Windows should also work but haven't been tested. Build steps for Windows are a bit more complicated. For the moment you are on your own there.
+Typing `make selftest` will build a *zerotier-selftest* binary which unit tests various internals and reports on a few aspects of the build environment. It's a good idea to try this on novel platforms or architectures.
 
-Mobile versions are in progress. They don't work yet, and in any case only the glue code will be included in this repository. The full mobile apps are in private repositories on our own git server.
+Windows, of course, is special. We build for Windows with Microsoft Visual Studio 2012 on Windows 7. A solution file is located in the *windows/* subfolder. Newer versions of Visual Studio (and Windows) may work but haven't been tested. Older versions almost certainly will not, since they lack things like *stdint.h* and certain STL features. MinGW or other ports of gcc/clang to Windows should also work but haven't been tested.
 
-### Supported Platforms
-
-CPU architecture shouldn't matter unless it's smaller than 32-bit or something really bizarre like a "middle-endian" processor. We have reports of ZeroTier One running on arm32, arm64, and MIPS. It builds and runs out of the box on Raspberry Pi, BeagleBone, BananaPi, and other ARM-based developer/hobbyist boards.
-
-ZeroTier is written in C and C++ (C++03 / ISO/IEC 14882:2003) and uses data structures and algorithms from the C++03 STL. We do not use any C++11 features (yet), since we want to support a few old and embedded platforms that don't have C++11 compilers. You *will* require a compiler and headers new enough to support 64-bit integers (long long) and the *stdint.h* header. The latter could also be faked by adding defines for things like *uint32\_t*, *int64\_t*, etc.
-
-Typing "make selftest" will build a *zerotier-selftest* binary which unit tests various internals and reports on a few aspects of the build environment. It's a good idea to try this on novel platforms or architectures.
+32 and 64 bit X86 and ARM (e.g. Raspberry Pi, Android) are officially supported. Community members have built for MIPS and Sparc without issues.
 
 ### Running
 
@@ -45,10 +61,10 @@ The service is controlled via the JSON API, which by default is available at 127
 
 Here's where home folders live (by default) on each OS:
 
- * Linux: /var/lib/zerotier-one
- * BSD: /var/db/zerotier-one
- * Mac: /Library/Application Support/ZeroTier/One
- * Windows: \\ProgramData\\ZeroTier\\One (That's for Windows 7. The base 'shared app data' folder might be different on different Windows versions.)
+ * **Linux**: `/var/lib/zerotier-one`
+ * **FreeBSD**: `/var/db/zerotier-one`
+ * **Mac**: `/Library/Application Support/ZeroTier/One`
+ * **Windows**: `\ProgramData\ZeroTier\One` (That's for Windows 7. The base 'shared app data' folder might be different on different Windows versions.)
 
 Running ZeroTier One on a Mac is the same, but OSX requires a kernel extension. We ship a signed binary build of the ZeroTier tap device driver, which can be installed on Mac with:
 
@@ -56,107 +72,17 @@ Running ZeroTier One on a Mac is the same, but OSX requires a kernel extension.
 
 This will create the home folder for Mac, place *tap.kext* there, and set its modes correctly to enable ZeroTier One to manage it with *kextload* and *kextunload*.
 
-We recommend using our binary packages on Windows, since there are several prerequisites such as a tap driver that must be installed on the system *and* in the home folder.
-
-### Joining A Network
-
-ZeroTier virtual networks are identified by 16-digit hexadecimal network IDs, while devices are identified by 10-digit addresses. To get your address run:
-
-    sudo zerotier-cli status
-
-(Use ./zerotier-cli if you're running it right from your build folder.)
-
-You should see something like:
-
-    200 info ########## ONLINE #.#.#
-
-That 10-digit hex code is you. It's derived via a one-way proof of work function from your cryptographic public key. Your public key can be found in *identity.public* in ZeroTier's home folder, while *identity.secret* contains your full identity including the secret portion of the key pair.
-
-(The identity files define your device's *identity*. Moving them to another system will move that identity. Be careful when cloning virtual machines that have identities stored on them. If two devices have the same identity, they'll "fight" over it and you won't know which device will receive network packets.)
-
-If you want to do a quick test, you can join [Earth](https://www.zerotier.com/earth.html). It's a global public network that anyone can join. Type:
-
-    sudo zerotier-cli join 8056c2e21c000001
-
-Then:
-
-    sudo zerotier-cli listnetworks
-
-At first it'll be in *REQUESTING\_CONFIGURATION* state. In a few seconds to a minute you should see something like:
-
-    200 listnetworks 8056c2e21c000001 earth.zerotier.net ##:##:##:##:##:## OK PUBLIC zt0 ##.##.##.##/##
-
-Earth will assign you an IP address in the "unofficially available" globally unrouted 28.0.0.0/7 IP block so as to avoid conflicts with local networks. (Your networks can use any IP scheme, or can even leave IP addresses unmanaged.) Once you get an IP, you should be able to ping something:
-
-    ping earth.zerotier.net
-
-Go to [http://earth.zerotier.net/](http://earth.zerotier.net/) to see a short little welcome page that will tell you your IP and Ethernet MAC address.
-
-Earth is a public place. If you don't want to stick around run:
-
-    sudo zerotier-cli leave 8056c2e21c000001
-
-The network (and associated interface) should be gone.
-
-Networks are created and administrated by network controllers. Most users will want to use our hosted controllers. Visit [our web site](https://www.zerotier.com/) for more information. Later in this README there are brief instructions about building ZeroTier One with network controller support for those who want to try running their own.
-
-Macintosh and Windows installers also install a GUI application.
-
-### Installing
-
-We don't have a "make install" rule quite yet. On Linux you can type:
-
-    make installer
-
-This will build a binary that, when run, will install ZeroTier One on most current Linux distributions. We also have RPM and DEB build files in *ext/installfiles/linux* that wrap this installer in packages for RedHat/CentOS and Debian/Ubuntu derived distributions. If *rpmbuild* is present on the system, the RPM will be built. If *dpkg-deb* is present, the DEB package will be built.
-
-On Mac the best way is to install [Packages](http://s.sudre.free.fr/Software/Packages/about.html) and use:
-
-    make mac-dist-pkg
-
-This builds a .pkg file that can be installed.
-
-BSD has no installer yet. We're working on it.
-
-Linux/BSD and Mac installations have an *uninstall.sh* file in their ZeroTier home folder that cleanly removes ZeroTier One from the system. Run this with:
-
-    sudo /path/to/ZeroTier/home/folder/uninstall.sh
-
-Windows installers are insane. We build our .MSI installers with [Advanced Installer Enterprise](http://www.advancedinstaller.com). The Advanced Installer project file is in *ext/installfiles/windows*. To avoid lasting psychological trauma we recommend leaving Windows installers alone and using the pre-built Windows binaries on our web site.
-
-### Using ZeroTier One in Docker Containers
-
-To run the ZeroTier One service in a Docker container, run it with "--device=/dev/net/tun --cap-add=NET_ADMIN". This will allow ZeroTier One to open a "tap" virtual network port inside the container.
-
-Alternately, you can use Ethernet bridging to bridge the *docker0* device on your system to a ZeroTier virtual network. This allows you to run ZeroTier One on the host and bridge the entire Docker network backplane to a virtual network or other hosts.
-
-We're working on better "official" Docker support. In the meantime there is a [user-contributed project here](https://github.com/davide/docker-zerotier).
-
-### Building with Network Controller Support
-
-**Warning: as of beta version 1.0.3 the new network controller is not heavily tested. We recommend waiting for 1.0.4 to deploy this in production.**
-
-Network controllers are nodes responsible for issuing configurations and certificates to members of ZeroTier virtual networks. Most users won't need to run their own, so this code is by default not included in the ZeroTier One binary.
-
-You can build a network controller on Linux or Mac with:
-
-    make ZT_ENABLE_NETWORK_CONTROLLER=1
-
-This will build a version that contains the Sqlite-backed network controller and associated extensions to the JSON local service control API. You will need the development headers for sqlite3 installed. On Mac these ship as part of Xcode, while on Linux they'll be found in packages for the various distributions.
-
-See the JSON API documentation in [service/](service/) for more information about how to control controllers.
-
 ### Troubleshooting
 
 For most users, it just works.
 
 If you are running a local system firewall, we recommend adding a rule permitting UDP port 9993 inbound and outbound. If you installed binaries for Windows this should be done automatically. Other platforms might require manual editing of local firewall rules depending on your configuration.
 
-The Mac firewall can be founder under "Security" in System Preferences. Linux has a variety of firewall configuration systems and tools. If you're using Ubuntu's *ufw*, you can do this:
+The Mac firewall can be found under "Security" in System Preferences. Linux has a variety of firewall configuration systems and tools. If you're using Ubuntu's *ufw*, you can do this:
 
     sudo ufw allow 9993/udp
 
-On CentOS check */etc/sysconfig/iptables* for IPTables rules. For other distributions consult your distribution's documentation. You'll also have to check the UIs or documentation for commercial third party firewall applications like Little Snitch (Mac), McAfee Firewall Enterprise (Windows), etc. if you are running any of those. Some corporate environments might have centrally managed firewall software, so you might also have to contact IT.
+On CentOS check `/etc/sysconfig/iptables` for IPTables rules. For other distributions consult your distribution's documentation. You'll also have to check the UIs or documentation for commercial third party firewall applications like Little Snitch (Mac), McAfee Firewall Enterprise (Windows), etc. if you are running any of those. Some corporate environments might have centrally managed firewall software, so you might also have to contact IT.
 
 ZeroTier One peers will automatically locate each other and communicate directly over a local wired LAN *if UDP port 9993 inbound is open*. If that port is filtered, they won't be able to see each others' LAN announcement packets. If you're experiencing poor performance between devices on the same physical network, check their firewall settings. Without LAN auto-location peers must attempt "loopback" NAT traversal, which sometimes fails and in any case requires that every packet traverse your external router twice.
 
@@ -166,6 +92,10 @@ If you're interested, there's a [technical deep dive about NAT traversal on our
 
 If a firewall between you and the Internet blocks ZeroTier's UDP traffic, you will fall back to last-resort TCP tunneling to rootservers over port 443 (https impersonation). This will work almost anywhere but is *very slow* compared to UDP or direct peer to peer connectivity.
 
+### Contributing
+
+Please make pull requests against the `dev` branch. The `master` branch is release, and `edge` is for unstable and work in progress changes and is not likely to work.
+
 ### License
 
 The ZeroTier source code is open source and is licensed under the GNU GPL v3 (not LGPL). If you'd like to embed it in a closed-source commercial product or appliance, please e-mail [contact@zerotier.com](mailto:contact@zerotier.com) to discuss commercial licensing. Otherwise it can be used for free.

attic/BandwidthAccount.hpp

@@ -1,153 +0,0 @@
-/*
- * ZeroTier One - Network Virtualization Everywhere
- * Copyright (C) 2011-2015  ZeroTier, Inc.
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- *
- * --
- *
- * ZeroTier may be used and distributed under the terms of the GPLv3, which
- * are available at: http://www.gnu.org/licenses/gpl-3.0.html
- *
- * If you would like to embed ZeroTier into a commercial application or
- * redistribute it in a modified binary form, please contact ZeroTier Networks
- * LLC. Start here: http://www.zerotier.com/
- */
-
-#ifndef ZT_BWACCOUNT_HPP
-#define ZT_BWACCOUNT_HPP
-
-#include "Constants.hpp"
-
-#include <algorithm>
-
-#include <stdint.h>
-#include <math.h>
-
-#include "Utils.hpp"
-
-#ifdef __WINDOWS__
-#define	round(x) ((x-floor(x))>0.5 ? ceil(x) : floor(x))
-#endif
-
-namespace ZeroTier {
-
-/**
- * Bandwidth account used for rate limiting multicast groups
- *
- * This is used to apply a bank account model to multicast groups. Each
- * multicast packet counts against a balance, which accrues at a given
- * rate in bytes per second. Debt is possible. These parameters are
- * configurable.
- *
- * A bank account model permits bursting behavior, which correctly models
- * how OSes and apps typically use multicast. It's common for things to
- * spew lots of multicast messages at once, wait a while, then do it
- * again. A consistent bandwidth limit model doesn't fit.
- */
-class BandwidthAccount
-{
-public:
-	/**
-	 * Create an uninitialized account
-	 *
-	 * init() must be called before this is used.
-	 */
-	BandwidthAccount() throw() {}
-
-	/**
-	 * Create and initialize
-	 *
-	 * @param preload Initial balance to place in account
-	 * @param maxb Maximum allowed balance (> 0)
-	 * @param acc Rate of accrual in bytes per second
-	 * @param now Current time
-	 */
-	BandwidthAccount(uint32_t preload,uint32_t maxb,uint32_t acc,uint64_t now)
-		throw()
-	{
-		init(preload,maxb,acc,now);
-	}
-
-	/**
-	 * Initialize or re-initialize account
-	 *
-	 * @param preload Initial balance to place in account
-	 * @param maxb Maximum allowed balance (> 0)
-	 * @param acc Rate of accrual in bytes per second
-	 * @param now Current time
-	 */
-	inline void init(uint32_t preload,uint32_t maxb,uint32_t acc,uint64_t now)
-		throw()
-	{
-		_lastTime = ((double)now / 1000.0);
-		_balance = preload;
-		_maxBalance = maxb;
-		_accrual = acc;
-	}
-
-	/**
-	 * Update and retrieve balance of this account
-	 *
-	 * @param now Current time
-	 * @return New balance updated from current clock
-	 */
-	inline uint32_t update(uint64_t now)
-		throw()
-	{
-		double lt = _lastTime;
-		double nowf = ((double)now / 1000.0);
-		_lastTime = nowf;
-		return (_balance = std::min(_maxBalance,(uint32_t)round((double)_balance + ((double)_accrual * (nowf - lt)))));
-	}
-
-	/**
-	 * Update balance and conditionally deduct
-	 *
-	 * If the deduction amount fits, it is deducted after update. Otherwise
-	 * balance is updated and false is returned.
-	 *
-	 * @param amt Amount to deduct
-	 * @param now Current time
-	 * @return True if amount fit within balance and was deducted
-	 */
-	inline bool deduct(uint32_t amt,uint64_t now)
-		throw()
-	{
-		if (update(now) >= amt) {
-			_balance -= amt;
-			return true;
-		}
-		return false;
-	}
-
-	/**
-	 * @return Most recent balance without update
-	 */
-	inline uint32_t balance() const
-		throw()
-	{
-		return _balance;
-	}
-
-private:
-	double _lastTime;
-	uint32_t _balance;
-	uint32_t _maxBalance;
-	uint32_t _accrual;
-};
-
-} // namespace ZeroTier
-
-#endif