3 .\" Author: [see the "AUTHORS" section]
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10 .TH "UANYTUN" "8" "06/21/2014" "\ \&" "\ \&"
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12 .\" * Define some portability stuff
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15 .\" http://bugs.debian.org/507673
16 .\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
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31 uanytun \- micro anycast tunneling daemon
36 [ \fB\-h|\-\-help\fR ]
37 [ \fB\-D|\-\-nodaemonize\fR ]
38 [ \fB\-u|\-\-username\fR <username> ]
39 [ \fB\-g|\-\-groupname\fR <groupname> ]
40 [ \fB\-C|\-\-chroot\fR <path> ]
41 [ \fB\-P|\-\-write\-pid\fR <filename> ]
42 [ \fB\-L|\-\-log\fR <target>:<level>[,<param1>[,<param2>[\&.\&.]]] ]
43 [ \fB\-U|\-\-debug\fR ]
44 [ \fB\-i|\-\-interface\fR <ip\-address> ]
45 [ \fB\-p|\-\-port\fR <port> ]
46 [ \fB\-r|\-\-remote\-host\fR <hostname|ip> ]
47 [ \fB\-o|\-\-remote\-port\fR <port> ]
48 [ \fB\-4|\-\-ipv4\-only\fR ]
49 [ \fB\-6|\-\-ipv6\-only\fR ]
50 [ \fB\-d|\-\-dev\fR <name> ]
51 [ \fB\-t|\-\-type\fR <tun|tap> ]
52 [ \fB\-n|\-\-ifconfig\fR <local>/<prefix> ]
53 [ \fB\-x|\-\-post\-up\-script\fR <script> ]
54 [ \fB\-m|\-\-mux\fR <mux\-id> ]
55 [ \fB\-s|\-\-sender\-id\fR <sender id> ]
56 [ \fB\-w|\-\-window\-size\fR <window size> ]
57 [ \fB\-k|\-\-kd\-prf\fR <kd\-prf type> ]
58 [ \fB\-e|\-\-role\fR <role> ]
59 [ \fB\-E|\-\-passphrase\fR <pass phrase> ]
60 [ \fB\-K|\-\-key\fR <master key> ]
61 [ \fB\-A|\-\-salt\fR <master salt> ]
62 [ \fB\-c|\-\-cipher\fR <cipher type> ]
63 [ \fB\-a|\-\-auth\-algo\fR <algo type> ]
64 [ \fB\-b|\-\-auth\-tag\-length\fR <length> ]
68 \fBuAnytun\fR is a tiny implementation of the Secure Anycast Tunneling Protocol (SATP)\&. It provides a complete VPN solution similar to OpenVPN or IPsec in tunnel mode\&. The main difference is that anycast enables the setup of tunnels between an arbitrary combination of anycast, unicast and multicast hosts\&. Unlike Anytun which is a full featured implementation uAnytun has no support for multiple connections or synchronisation\&. It is a small single threaded implementation intended to act as a client on small platforms\&.
71 \fBuAnytun\fR has been designed as a peer to peer application, so there is no difference between client and server\&. The following options can be passed to the daemon:
73 \fB\-D, \-\-nodaemonize\fR
77 to run in foreground instead of becoming a daemon which is the default\&.
80 \fB\-u, \-\-username \fR\fB\fI<username>\fR\fR
82 run as this user\&. If no group is specified (\fB\-g\fR) the default group of the user is used\&. The default is to not drop privileges\&.
85 \fB\-g, \-\-groupname \fR\fB\fI<groupname>\fR\fR
87 run as this group\&. If no username is specified (\fB\-u\fR) this gets ignored\&. The default is to not drop privileges\&.
90 \fB\-C, \-\-chroot \fR\fB\fI<path>\fR\fR
94 to run in a chroot jail\&. The default is to not run in chroot\&.
97 \fB\-P, \-\-write\-pid <filename>\fR
101 to write it\(cqs pid to this file\&. The default is to not create a pid file\&.
104 \fB\-L, \-\-log \fR\fB\fI<target>:<level>[,<param1>[,<param2>[\&.\&.]]]\fR\fR
106 add log target to logging system\&. This can be invoked several times in order to log to different targets at the same time\&. Every target has its own log level which is a number between 0 and 5\&. Where 0 means disabling log and 5 means debug messages are enabled\&.
108 The file target can be used more than once with different levels\&. If no target is provided at the command line a single target with the config
109 \fIsyslog:3,uanytun,daemon\fR
112 The following targets are supported:
116 log to syslog daemon, parameters <level>[,<logname>[,<facility>]]
121 log to file, parameters <level>[,<path>]
126 log to standard output, parameters <level>
131 log to standard error, parameters <level>
137 This option instructs
139 to run in debug mode\&. It implicits
141 (don\(cqt daemonize) and adds a log target with the configuration
143 (logging with maximum level)\&. In future releases there might be additional output when this option is supplied\&.
146 \fB\-i, \-\-interface \fR\fB\fI<ip address>\fR\fR
148 This IP address is used as the sender address for outgoing packets\&. The default is to not use a special inteface and just bind on all interfaces\&.
151 \fB\-p, \-\-port \fR\fB\fI<port>\fR\fR
153 The local UDP port that is used to send and receive the payload data\&. The two tunnel endpoints can use different ports\&. default: 4444
156 \fB\-r, \-\-remote\-host \fR\fB\fI<hostname|ip>\fR\fR
158 This option can be used to specify the remote tunnel endpoint\&. In case of anycast tunnel endpoints, the anycast IP address has to be used\&. If you do not specify an address, it is automatically determined after receiving the first data packet\&.
161 \fB\-o, \-\-remote\-port \fR\fB\fI<port>\fR\fR
163 The UDP port used for payload data by the remote host (specified with \-p on the remote host)\&. If you do not specify a port, it is automatically determined after receiving the first data packet\&.
166 \fB\-4, \-\-ipv4\-only\fR
168 Resolv to IPv4 addresses only\&. The default is to resolv both IPv4 and IPv6 addresses\&.
171 \fB\-6, \-\-ipv6\-only\fR
173 Resolv to IPv6 addresses only\&. The default is to resolv both IPv4 and IPv6 addresses\&.
176 \fB\-d, \-\-dev \fR\fB\fI<name>\fR\fR
180 By default, tapN is used for Ethernet tunnel interfaces, and tunN for IP tunnels, respectively\&. This option can be used to manually override these defaults\&.
183 \fB\-t, \-\-type \fR\fB\fI<tun|tap>\fR\fR
187 Type of the tunnels to create\&. Use tap for Ethernet tunnels, tun for IP tunnels\&.
190 \fB\-n, \-\-ifconfig \fR\fB\fI<local>/<prefix>\fR\fR
192 The local IP address and prefix length\&. The remote tunnel endpoint has to use a different IP address in the same subnet\&.
196 the local IP address for the tun/tap device
201 the prefix length of the network
205 \fB\-x, \-\-post\-up\-script \fR\fB\fI<script>\fR\fR
207 This option instructs
209 to run this script after the interface is created\&. By default no script will be executed\&.
212 \fB\-m, \-\-mux \fR\fB\fI<mux\-id>\fR\fR
214 the multiplex id to use\&. default: 0
217 \fB\-s, \-\-sender\-id \fR\fB\fI<sender id>\fR\fR
219 Each anycast tunnel endpoint needs a unique sender id (1, 2, 3, \&...)\&. It is needed to distinguish the senders in case of replay attacks\&. As
221 does not support synchronisation it can\(cqt be used as an anycast endpoint therefore this option is quite useless but implemented for compatibility reasons\&. default: 0
224 \fB\-w, \-\-window\-size \fR\fB\fI<window size>\fR\fR
228 Sometimes, packets arrive out of order on the receiver side\&. This option defines the size of a list of received packets\*(Aq sequence numbers\&. If, according to this list, a received packet has been previously received or has been transmitted in the past, and is therefore not in the list anymore, this is interpreted as a replay attack and the packet is dropped\&. A value of 0 deactivates this list and, as a consequence, the replay protection employed by filtering packets according to their secuence number\&. By default the sequence window is disabled and therefore a window size of 0 is used\&.
231 \fB\-k, \-\-kd\(emprf \fR\fB\fI<kd\-prf type>\fR\fR
233 key derivation pseudo random function
235 The pseudo random function which is used for calculating the session keys and session salt\&.
241 no random function, keys and salt are set to 0\&.\&.00
246 AES in counter mode with 128 Bits, default value
251 AES in counter mode with 128 Bits
256 AES in counter mode with 192 Bits
261 AES in counter mode with 256 Bits
265 \fB\-e, \-\-role \fR\fB\fI<role>\fR\fR
267 SATP uses different session keys for inbound and outbound traffic\&. The role parameter is used to determine which keys to use for outbound or inbound packets\&. On both sides of a vpn connection different roles have to be used\&. Possible values are
270 \fIright\fR\&. You may also use
281 \fIright\fR\&. By default
286 \fB\-E, \-\-passphrase \fR\fB\fI<pass phrase>\fR\fR
288 This passphrase is used to generate the master key and master salt\&. For the master key the last n bits of the SHA256 digest of the passphrase (where n is the length of the master key in bits) is used\&. The master salt gets generated with the SHA1 digest\&. You may force a specific key and or salt by using
294 \fB\-K, \-\-key \fR\fB\fI<master key>\fR\fR
296 master key to use for key derivation
298 Master key in hexadecimal notation, e\&.g\&. 01a2b3c4d5e6f708a9b0cadbecfd0fa1, with a mandatory length of 32, 48 or 64 characters (128, 192 or 256 bits)\&.
301 \fB\-A, \-\-salt \fR\fB\fI<master salt>\fR\fR
303 master salt to use for key derivation
305 Master salt in hexadecimal notation, e\&.g\&. 01a2b3c4d5e6f708a9b0cadbecfd, with a mandatory length of 28 characters (14 bytes)\&.
308 \fB\-c, \-\-cipher \fR\fB\fI<cipher type>\fR\fR
310 payload encryption algorithm
312 Encryption algorithm used for encrypting the payload
323 AES in counter mode with 128 Bits, default value
328 AES in counter mode with 128 Bits
333 AES in counter mode with 192 Bits
338 AES in counter mode with 256 Bits
342 \fB\-a, \-\-auth\-algo \fR\fB\fI<algo type>\fR\fR
344 message authentication algorithm
346 This option sets the message authentication algorithm\&.
348 If HMAC\-SHA1 is used, the packet length is increased\&. The additional bytes contain the authentication data\&. see
349 \fB\-\-auth\-tag\-length\fR
356 no message authentication
361 HMAC\-SHA1, default value
365 \fB\-b, \-\-auth\-tag\-length \fR\fB\fI<length>\fR\fR
367 The number of bytes to use for the auth tag\&. This value defaults to 10 bytes unless the
369 auth algo is used in which case it defaults to 0\&.
372 .SS "P2P Setup between two unicast enpoints:"
375 .nr an-no-space-flag 1
382 uanytun \-r hostb\&.example\&.com \-t tun \-n 192\&.168\&.123\&.1/30 \-c aes\-ctr\-256 \-k aes\-ctr\-256 \-E have_a_very_safe_and_productive_day \-e left
386 .nr an-no-space-flag 1
393 uanytun \-r hosta\&.example\&.com \-t tun \-n 192\&.168\&.123\&.2/30 \-c aes\-ctr\-256 \-k aes\-ctr\-256 \-E have_a_very_safe_and_productive_day \-e right
395 .SS "One unicast and one anycast tunnel endpoint:"
398 .nr an-no-space-flag 1
402 \fBUnicast tunnel endpoint:\fR
405 uanytun \-r anycast\&.anytun\&.org \-d anytun0 \-t tun \-n 192\&.0\&.2\&.2/30 \-a null \-c null \-w 0 \-e client
409 .nr an-no-space-flag 1
413 \fBAnycast tunnel endpoints:\fR
416 As \fBuAnytun\fR can\(cqt work as an anycast endpoint it can\(cqt be used for this purpose\&. You have to use \fBAnytun\fR for that job\&.
420 Most likely there are some bugs in \fBuAnytun\fR\&. If you find a bug, please let the developers know at uanytun@anytun\&.org\&. Of course, patches are preferred\&.
423 Christian Pointner <equinox@anytun\&.org>
426 Main web site: http://www\&.anytun\&.org/
429 Copyright (C) 2008\-2014 Christian Pointner\&. 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 any later version\&.