The Serval Project's core daemon that implements Distributed Numbering Architecture (DNA), MDP, VoMP, Rhizome, MeshMS, etc.
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crypto.c crypto_sign_compute_public_key() return void not int 2015-03-23 17:31:06 +10:30
crypto.h crypto_sign_compute_public_key() return void not int 2015-03-23 17:31:06 +10:30
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dna_helper.c Handle stream EOF without entering an infinite poll loop 2016-01-27 16:27:02 +10:30
fakeradio.c Refactor source and build process to split out test commands 2014-12-01 13:26:27 +10:30
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golay.c Refactor to fix some OS-X compile warnings 2014-08-14 17:39:44 +09:30
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instance.h Fix broken clang and Android builds 2015-11-23 15:00:25 +10:30
jni.c Imported ref10/ implementation of crypto_sign from supercop-20120525 2012-10-18 17:26:48 +10:30
keyring_cli.c allow a key to be created with a known prefix (so that we can debug 2016-04-29 10:31:42 +02:00
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meshms_restful.c Report missing Content-Disposition header 2016-02-22 18:14:53 +10:30
meshms.c Improve Rhizome HTTP API diagnostics 2015-12-07 22:35:42 +10:30
meshms.h Fix RESTful MeshMS newsince ACK logic 2014-11-12 23:09:00 +10:30
meshpotato_build Assorted unknown changes. Updated Makefile.in etc to properly build serval.c for building asterisk module. 2011-06-15 13:52:30 +09:30
monitor-cli.c Build the array of console commands by using linkage tricks 2014-08-22 10:36:52 +09:30
monitor-client.c Move DEBUGF() from "log.h" to "debug.h" 2015-07-13 18:24:04 +09:30
monitor-client.h Uniform #ifdef __SERVAL_DNA__... for headers 2013-12-04 17:15:36 +10:30
monitor.c Add interface index to UP/DOWN monitor message 2016-04-27 13:16:00 +09:30
mpbuild Added mesh potato build script. 2011-08-10 15:39:40 +02:00
msp_client.c Move DEBUGF() from "log.h" to "debug.h" 2015-07-13 18:24:04 +09:30
msp_client.h Overhaul Makefile and header files 2014-05-26 15:36:26 +09:30
msp_proxy.c Move DEBUGF() from "log.h" to "debug.h" 2015-07-13 18:24:04 +09:30
net.c Handle stream EOF without entering an infinite poll loop 2016-01-27 16:27:02 +10:30
net.h Include "whence.h" instead of "log.h" where suitable 2015-07-13 18:24:16 +09:30
network_cli.c Reduce technical debt 2016-04-26 10:21:43 +09:30
os.c Avoid undefined behaviour as highlighted by clang 2016-01-27 16:27:47 +10:30
os.h Add timestamps to meshms messages and acks 2014-07-14 13:43:37 +09:30
overlay_address.c Simplify subscriber enumeration & only support the use-cases we need 2016-01-12 11:47:29 +10:30
overlay_address.h Add prior hop SID to route print output 2016-03-02 10:51:16 +10:30
overlay_buffer.c Clean up ugly malloc corruption code, limit allocated size 2016-05-02 11:10:59 +09:30
overlay_buffer.h Refactor rhizome mdp and vomp packet sending 2014-02-19 16:38:26 +10:30
overlay_interface.c Add interface index to UP/DOWN monitor message 2016-04-27 13:16:00 +09:30
overlay_interface.h Add debug messages to diagnose possible ref counting bug 2016-05-02 10:48:36 +09:30
overlay_link.c Remove overlay_interface_find_name 2016-04-27 13:10:31 +09:30
overlay_mdp_services.c Define internal port bindings with section linking tricks 2016-03-07 15:50:34 +10:30
overlay_mdp.c Define internal port bindings with section linking tricks 2016-03-07 15:50:34 +10:30
overlay_olsr.c Don't ask for explanation of SIDs with dead routing links 2015-11-16 14:09:35 +10:30
overlay_packet.h Define internal port bindings with section linking tricks 2016-03-07 15:50:34 +10:30
overlay_packetformats.c Don't ask for explanation of SIDs with dead routing links 2015-11-16 14:09:35 +10:30
overlay_packetradio.c Move if(config.debug.xxx) tests into DEBUGF() 2015-07-13 16:00:05 +09:30
overlay_payload.c Allow for different routes per packet destination 2014-09-23 14:54:22 +09:30
overlay_queue.c Avoid undefined behaviour as highlighted by clang 2016-01-27 16:27:47 +10:30
performance_timing.c Move if(config.debug.xxx) tests into DEBUGF() 2015-07-13 16:00:05 +09:30
radio_link.c Move if(config.debug.xxx) tests into DEBUGF() 2015-07-13 16:00:05 +09:30
radio_link.h Uniform #ifdef __SERVAL_DNA__... for headers 2013-12-04 17:15:36 +10:30
randombytes.c More consistent use of sleep_ms 2013-08-27 15:14:17 +09:30
README.md Minor improvements to README 2016-01-11 18:02:26 +10:30
rhizome_bundle.c Add sqlite column for the hash of the manifest (before any signatures) 2016-03-07 14:34:53 +10:30
rhizome_cli.c Append manifest into zip file comment 2016-03-30 16:25:43 +10:30
rhizome_crypto.c Add sqlite column for the hash of the manifest (before any signatures) 2016-03-07 14:34:53 +10:30
rhizome_database.c Only trigger bundle add hooks within the daemon thread / process 2016-03-30 17:18:40 +10:30
rhizome_direct_http.c Append manifest into zip file comment 2016-03-30 16:25:43 +10:30
rhizome_direct.c Add strbuf_local_buf() macro 2015-11-02 10:11:41 +10:30
rhizome_fetch.c Handle stream EOF without entering an infinite poll loop 2016-01-27 16:27:02 +10:30
rhizome_http.c Add strbuf_local_buf() macro 2015-11-02 10:11:41 +10:30
rhizome_packetformats.c make rhizome http port number configurable via serval.conf 2015-08-24 16:06:25 +09:30
rhizome_restful.c Report missing Content-Disposition header 2016-02-22 18:14:53 +10:30
rhizome_store.c Ensure we rollback if commit fails 2016-04-18 16:06:27 +09:30
rhizome_sync.c Rework detection of rhizome add from cli to trigger bundle_add 2016-03-08 13:33:23 +10:30
rhizome_types.h Replace nacl & sha methods with versions from libsodium to avoid undefined behaviour 2016-01-27 16:27:04 +10:30
rhizome.c Append manifest into zip file comment 2016-03-30 16:25:43 +10:30
rhizome.h Append manifest into zip file comment 2016-03-30 16:25:43 +10:30
rotbuf.c Fix bug in rotbuf_next_chunk() when rotation == 0 2013-05-15 16:46:39 +09:30
rotbuf.h Remove spurious rotbuf_log() declaration, fixes 2014-04-03 10:43:14 +10:30
route_link.c Add debug messages to diagnose possible ref counting bug 2016-05-02 10:48:36 +09:30
route_link.h Define trigger for changes to the neighbour list 2016-03-08 11:24:09 +10:30
section.h Flip section linking tests 2016-03-30 16:25:43 +10:30
serval_packetvisualise.c Overhaul Makefile and header files 2014-05-26 15:36:26 +09:30
serval_types.h Replace nacl & sha methods with versions from libsodium to avoid undefined behaviour 2016-01-27 16:27:04 +10:30
serval.h Define internal port bindings with section linking tricks 2016-03-07 15:50:34 +10:30
servalwrap.c Fix android commandline interface 2013-07-09 16:46:16 +09:30
server_httpd.c Add strbuf_local_buf() macro 2015-11-02 10:11:41 +10:30
server.c Fix bug with syncing config within a multi-threaded java process 2016-04-13 11:24:24 +09:30
server.h Add support for running and stopping servald from a JVM thread 2015-05-25 11:46:37 +09:30
sha2.c Replace nacl & sha methods with versions from libsodium to avoid undefined behaviour 2016-01-27 16:27:04 +10:30
sha2.h Replace nacl & sha methods with versions from libsodium to avoid undefined behaviour 2016-01-27 16:27:04 +10:30
sighandlers.c Fix broken clang and Android builds 2015-11-23 15:00:25 +10:30
sighandlers.h Overhaul Makefile and header files 2014-05-26 15:36:26 +09:30
simulator.c Add strbuf_local_buf() macro 2015-11-02 10:11:41 +10:30
simulator.h Create new AF_UNIX based network simulator 2014-05-23 10:47:22 +09:30
socket.c Fix MDP client packet receive bug on OSX 2016-01-19 04:05:46 +10:30
socket.h Fix MDP client packet receive bug on OSX 2016-01-19 04:05:46 +10:30
sourcefiles.mk Update sqlite 2016-01-27 16:27:03 +10:30
srandomdev.c Add supid copyright headers on request from Andrew Bettison in the serval project. 2013-12-07 18:38:14 +01:00
str.c Replace nacl & sha methods with versions from libsodium to avoid undefined behaviour 2016-01-27 16:27:04 +10:30
str.h Add buf_strncpy_nul(), use in place of strlcpy() 2015-11-02 10:11:41 +10:30
strbuf_helpers.c Avoid undefined behaviour as highlighted by clang 2016-01-27 16:27:47 +10:30
strbuf_helpers.h Format network addresses using posix API 2015-09-28 11:58:48 +09:30
strbuf.c Optimise strbuf_ncat() 2015-11-17 00:42:06 +10:30
strbuf.h Workaround stack alignment bugs when compiling with clang 2016-01-27 16:27:47 +10:30
strlcpy.c Reimplement strlcpy() using strncpy_nul() 2015-11-02 10:11:41 +10:30
strlcpy.h Reimplement strlcpy() using strncpy_nul() 2015-11-02 10:11:41 +10:30
test_cli.c Fix broken clang and Android builds 2015-11-23 15:00:25 +10:30
testconfig.sh.in Trival test of dna JNI command line entry point 2012-04-23 18:25:26 +09:30
testdefs_java.sh Split java test classes into a separate folder 2016-01-19 10:41:52 +10:30
testdefs_json.sh Improve JSON test defs to ensure setup_jq is called before jq 2016-02-15 18:41:54 +10:30
testdefs_meshms.sh Fix 'meshms' and 'meshmsjava' newsince-arrival tests 2015-05-25 16:46:43 +09:30
testdefs_rhizome.sh Fix 'rhizomerestful' and 'rhizomejava' newsince-arrival tests 2015-06-02 02:23:06 +09:30
testdefs.sh add test for MDP routing among peers with the same SID prefix, 2016-04-29 17:01:11 +02:00
testframework.sh Fix OSX bugs in test framework 2016-01-27 00:24:43 +10:30
testnacl.c Add missing copyright/license comment blocks 2013-11-21 16:05:18 +10:30
tfw_createfile.c Add --omit option to 'tfw_createfile' utility 2015-12-07 22:35:42 +10:30
timeit.c add context switching speed test to "test memory" command. 2013-10-22 13:12:10 -07:00
trigger.h Remove terminating semicolons from within macros 2015-11-02 10:11:41 +10:30
uuid.c Rename uuid_t --> serval_uuid_t 2014-02-17 13:26:03 +10:30
uuid.h Rename uuid_t --> serval_uuid_t 2014-02-17 13:26:03 +10:30
version_servald.c Add "servald version" command and "make copyright" 2013-12-05 14:32:01 +10:30
version_string.sh Don't depend on .git folders or on error text strings 2014-12-12 11:01:34 +10:30
vomp_console.c Don't continuously toggle fd blocking mode 2016-03-30 16:25:43 +10:30
vomp.c Define internal port bindings with section linking tricks 2016-03-07 15:50:34 +10:30
whence.c Add alloca_sourceloc(), refactored from log.c 2015-06-29 15:39:19 +09:30
whence.h Add alloca_sourceloc(), refactored from log.c 2015-06-29 15:39:19 +09:30
xprintf.c Add XPRINT strbuf adapter 2013-03-25 12:02:48 +10:30
xprintf.h Fix broken clang and Android builds 2015-11-23 15:00:25 +10:30

Serval DNA

Serval Project, March 2014

Serval DNA is the core component of the Serval Mesh app for Android and the Serval Mesh Extender long-range mesh networking device. It is a daemon process that performs all the central services of the Serval mesh network such as dynamic routing, encryption and authentication, file distribution, messaging, and voice telephony.

Any device with Wi-Fi connectivity that runs the Serval DNA daemon can participate in the Serval mesh network.

Download, build and test

  • INSTALL.md contains instructions for downloading, building and testing Serval DNA on most Linux and some Linux-like platforms.

  • Notes for Developers contains useful information for developers of Serval DNA, which may also help resolve build issues.

Configuration

Documentation

Bugs and issues

What is in this repository?

This repository contains the GNU C source code for the servald executable, a test framework and test scripts written in Bash, some technical documentation, and various support files for installation and configuration on various platforms.

The servald executable is a multi-purpose program that can be invoked directly from the command line, run as a daemon process, or invoked via JNI from within a Java program. The servald executable is really many commands built into one; the command-line arguments select which command to run. Some commands are stand-alone utilities, some start and stop the servald daemon process, some communicate with the servald daemon as an MDP client, and others via a two-way pipe called the monitor interface.

The following protocols and services are implemented in servald:

  • The Distributed Numbering Architecture (DNA) is the key innovation that makes mesh telephony viable in the absence of any infrastructure, eg, in the aftermath of a natural disaster or in remote locations. DNA is a protocol carried over MDP (see below) that asks many devices at once if they will answer a phone number (DID). A device will respond with its own subscriber identity (SID) if its user has “claimed” that DID. This allows phone calls to be established over the mesh using conventional phone numbers.

  • The Serval Keyring is a flat file containing all the user identities on a single device. Each identity is a set of elliptic curve secret cryptographic keys that belong to a single “mesh subscriber”, indexed by the subscriber's 256-bit public key, called a SID. Each identity in the keyring is locked by its own user-chosen password (called a PIN in the code and documentation), using elliptic curve cryptography to protect locked entries from theft or tampering, and steganography to allow the user to plausibly deny the existence of locked identities.

  • The Mesh Datagram Protocol (MDP) is Serval's own layer 3 protocol designed for secure mesh networking. It is completely independent of Internet protocols such as IP and UDP, although for the time being it is implemented as an “overlay” network based on UDP/IP because that is the interface that Linux and other operating systems provide for sending data over Wi-Fi. However, MDP could easily be implemented directly over a layer 2 data link such as Wi-Fi or Ethernet MAC. MDP uses subscribers' public keys (SID) as source and destination addresses, has a 32-bit port number analogous to the 16-bit port number used in TCP/IP, and encrypts all packet contents by default, using the public key (SID) of the destination.

  • The Voice over Mesh Protocol (VoMP) is Serval's own call negotiation and two-way audio streaming protocol used to implement mesh voice calls. It fills the same role as SIP/RTS, the dominant protocol used for Voice over Internet Protocol, but VoMP is designed for the variable and unstable conditions of wireless mesh networks. VoMP's session state model and signalling can handle packet loss, mid-call re-routing and re-connection where SIP would fail. VoMP's audio streaming can encapsulate many codecs and even DTMF (dialpad button) signalling.

  • Rhizome is a content storage and distribution service implemented using SQLite and a content-exchange protocol based on MDP. It can be used to disseminate content like images, videos, documents, software upgrades, etc. Each piece of content in Rhizome is called a “bundle”, which has two parts: a manifest that describes the content, and the payload, which is the content itself. Each bundle has its own unique cryptographic identifier that allows any recipient to verify that it has not been tampered with. A bundle's payload may be encrypted by the author so that only the designated recipient can read it.

  • The MeshMS messaging service sends short text messages using Rhizome as its transport. Each message thread is stored and carried in a pair of journal bundles, one for each direction (ply).

  • Serval Infrastructure services may optionally be deployed on any devices in the mesh to expose external services to mesh subscribers and vice versa (eg, VoIP gateways, SMS satellite links, packetised web), and to overcome scalability limitations of a perfectly decentralised mesh (eg, central telephone directory). Serval Infrastructure is implemented as a daemon with its own executable called directory_service.

Serval DNA is free software produced by the Serval Project and many contributors. Its source code is licensed to the public under the GNU General Public License version 2. Its technical documentation is licensed to the public under the Creative Commons Attribution 4.0 International licence. All source code and technical documentation is freely available from the Serval Project's serval-dna Git repository on GitHub.

The copyright in most of the source code in Serval DNA is held by Serval Project Inc., a not-for-profit association incorporated in the state of South Australia in the Commonwealth of Australia for the purpose of developing the Serval mesh software. The COPYRIGHT file contains a full list of all those who hold copyright in portions of the Serval DNA source code.

The Serval Project will accept contributions for which copyright has been assigned to Serval Project Inc., or which are licensed to either Serval Project Inc. or to the public on terms that allow the Serval Project to freely redistribute and re-license the code under non-restrictive terms, for example, to release Serval DNA as part of a product distributed through the Apple app store.

Individual developers may assign copyright in their contributions by signing the Serval Project Developer Agreement - Individual, and organisations by signing the Serval Project Developer Agreement - Entity.


Copyright 2014 Serval Project Inc.
CC-BY-4.0 This document is available under the Creative Commons Attribution 4.0 International licence.