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+'\" t
+.\"     Title: uanytun
+.\"    Author: [see the "AUTHORS" section]
+.\" Generator: DocBook XSL Stylesheets v1.75.1 <http://docbook.sf.net/>
+.\"      Date: 12/22/2009
+.\"    Manual: uanytun user manual
+.\"    Source: uanytun trunk
+.\"  Language: English
+.\"
+.TH "UANYTUN" "8" "12/22/2009" "uanytun trunk" "uanytun user manual"
+.\" -----------------------------------------------------------------
+.\" * set default formatting
+.\" -----------------------------------------------------------------
+.\" disable hyphenation
+.nh
+.\" disable justification (adjust text to left margin only)
+.ad l
+.\" -----------------------------------------------------------------
+.\" * MAIN CONTENT STARTS HERE *
+.\" -----------------------------------------------------------------
+.SH "NAME"
+uanytun \- micro anycast tunneling daemon
+.SH "SYNOPSIS"
+.sp
+.nf
+\fBuanytun\fR
+  [ \fB\-h|\-\-help\fR ]
+  [ \fB\-D|\-\-nodaemonize\fR ]
+  [ \fB\-u|\-\-username\fR <username> ]
+  [ \fB\-g|\-\-groupname\fR <groupname> ]
+  [ \fB\-C|\-\-chroot\fR <path> ]
+  [ \fB\-P|\-\-write\-pid\fR <filename> ]
+  [ \fB\-L|\-\-log\fR <target>:<level>[,<param1>[,<param2>[\&.\&.]]] ]
+  [ \fB\-i|\-\-interface\fR <ip\-address> ]
+  [ \fB\-p|\-\-port\fR <port> ]
+  [ \fB\-r|\-\-remote\-host\fR <hostname|ip> ]
+  [ \fB\-o|\-\-remote\-port\fR <port> ]
+  [ \fB\-4|\-\-ipv4\-only\fR ]
+  [ \fB\-6|\-\-ipv6\-only\fR ]
+  [ \fB\-d|\-\-dev\fR <name> ]
+  [ \fB\-t|\-\-type\fR <tun|tap> ]
+  [ \fB\-n|\-\-ifconfig\fR <local>/<prefix> ]
+  [ \fB\-x|\-\-post\-up\-script\fR <script> ]
+  [ \fB\-m|\-\-mux\fR <mux\-id> ]
+  [ \fB\-s|\-\-sender\-id\fR <sender id> ]
+  [ \fB\-w|\-\-window\-size\fR <window size> ]
+  [ \fB\-k|\-\-kd\-prf\fR <kd\-prf type> ]
+  [ \fB\-e|\-\-role\fR <role> ]
+  [ \fB\-E|\-\-passphrase\fR <pass phrase> ]
+  [ \fB\-K|\-\-key\fR <master key> ]
+  [ \fB\-A|\-\-salt\fR <master salt> ]
+  [ \fB\-c|\-\-cipher\fR <cipher type> ]
+  [ \fB\-a|\-\-auth\-algo\fR <algo type> ]
+  [ \fB\-b|\-\-auth\-tag\-length\fR <length> ]
+.fi
+.SH "DESCRIPTION"
+.sp
+\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\&.
+.SH "OPTIONS"
+.sp
+\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:
+.PP
+\fB\-D, \-\-nodaemonize\fR
+.RS 4
+This option instructs
+\fBuAnytun\fR
+to run in foreground instead of becoming a daemon which is the default\&.
+.RE
+.PP
+\fB\-u, \-\-username <username>\fR
+.RS 4
+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\&.
+.RE
+.PP
+\fB\-g, \-\-groupname <groupname>\fR
+.RS 4
+run as this group\&. If no username is specified (\fB\-u\fR) this gets ignored\&. The default is to not drop privileges\&.
+.RE
+.PP
+\fB\-C, \-\-chroot <path>\fR
+.RS 4
+Instruct
+\fBuAnytun\fR
+to run in a chroot jail\&. The default is to not run in chroot\&.
+.RE
+.PP
+\fB\-P, \-\-write\-pid <filename>\fR
+.RS 4
+Instruct
+\fBuAnytun\fR
+to write it\(cqs pid to this file\&. The default is to not create a pid file\&.
+.RE
+.PP
+\fB\-L, \-\-log <target>:<level>[,<param1>[,<param2>[\&.\&.]]]\fR
+.RS 4
+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 hast its own log level which is a number between 0 and 5\&. Where 0 means disabling log and 5 means debug messages are enabled\&.
+
+The file target can be used more the once with different levels\&. If no target is provided at the command line a single target with the config
+\fBsyslog:3,uanytun,daemon\fR
+is added\&.
+
+The following targets are supported:
+.PP
+\fBsyslog\fR
+.RS 4
+log to syslog daemon, parameters <level>[,<logname>[,<facility>]]
+.RE
+.PP
+\fBfile\fR
+.RS 4
+log to file, parameters <level>[,<path>]
+.RE
+.PP
+\fBstdout\fR
+.RS 4
+log to standard output, parameters <level>
+.RE
+.PP
+\fBstderr\fR
+.RS 4
+log to standard error, parameters <level>
+.RE
+.RE
+.PP
+\fB\-i, \-\-interface <ip address>\fR
+.RS 4
+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\&.
+.RE
+.PP
+\fB\-p, \-\-port <port>\fR
+.RS 4
+The local UDP port that is used to send and receive the payload data\&. The two tunnel endpoints can use different ports\&. default: 4444
+.RE
+.PP
+\fB\-r, \-\-remote\-host <hostname|ip>\fR
+.RS 4
+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\&.
+.RE
+.PP
+\fB\-o, \-\-remote\-port <port>\fR
+.RS 4
+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\&.
+.RE
+.PP
+\fB\-4, \-\-ipv4\-only\fR
+.RS 4
+Resolv to IPv4 addresses only\&. The default is to resolv both IPv4 and IPv6 addresses\&.
+.RE
+.PP
+\fB\-6, \-\-ipv6\-only\fR
+.RS 4
+Resolv to IPv6 addresses only\&. The default is to resolv both IPv4 and IPv6 addresses\&.
+.RE
+.PP
+\fB\-d, \-\-dev <name>\fR
+.RS 4
+device name
+
+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\&.
+.RE
+.PP
+\fB\-t, \-\-type <tun|tap>\fR
+.RS 4
+device type
+
+Type of the tunnels to create\&. Use tap for Ethernet tunnels, tun for IP tunnels\&.
+.RE
+.PP
+\fB\-n, \-\-ifconfig <local>/<prefix>\fR
+.RS 4
+The local IP address and prefix length\&. The remote tunnel endpoint has to use a different IP address in the same subnet\&.
+.PP
+\fB<local>\fR
+.RS 4
+the local IP address for the tun/tap device
+.RE
+.PP
+\fB<prefix>\fR
+.RS 4
+the prefix length of the network
+.RE
+.RE
+.PP
+\fB\-x, \-\-post\-up\-script <script>\fR
+.RS 4
+This option instructs
+\fBuAnytun\fR
+to run this script after the interface is created\&. By default no script will be executed\&.
+.RE
+.PP
+\fB\-m, \-\-mux <mux\-id>\fR
+.RS 4
+the multiplex id to use\&. default: 0
+.RE
+.PP
+\fB\-s, \-\-sender\-id <sender id>\fR
+.RS 4
+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
+\fBuAnytun\fR
+does not support synchronisation it can\(cqt be used as an anycast endpoint therefore this option is quite useless but implemented for compability reasons\&. default: 0
+.RE
+.PP
+\fB\-w, \-\-window\-size <window size>\fR
+.RS 4
+seqence window size
+
+Sometimes, packets arrive out of order on the receiver side\&. This option defines the size of a list of received packets\' 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\&.
+.RE
+.PP
+\fB\-k, \-\-kd\(emprf <kd\-prf type>\fR
+.RS 4
+key derivation pseudo random function
+
+The pseudo random function which is used for calculating the session keys and session salt\&.
+
+Possible values:
+.PP
+\fBnull\fR
+.RS 4
+no random function, keys and salt are set to 0\&.\&.00
+.RE
+.PP
+\fBaes\-ctr\fR
+.RS 4
+AES in counter mode with 128 Bits, default value
+.RE
+.PP
+\fBaes\-ctr\-128\fR
+.RS 4
+AES in counter mode with 128 Bits
+.RE
+.PP
+\fBaes\-ctr\-192\fR
+.RS 4
+AES in counter mode with 192 Bits
+.RE
+.PP
+\fBaes\-ctr\-256\fR
+.RS 4
+AES in counter mode with 256 Bits
+.RE
+.RE
+.PP
+\fB\-e, \-\-role <role>\fR
+.RS 4
+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
+\fBleft\fR
+and
+\fBright\fR\&. You may also use
+\fBalice\fR
+or
+\fBserver\fR
+as a replacement for
+\fBleft\fR
+and
+\fBbob\fR
+or
+\fBclient\fR
+as a replacement for
+\fBright\fR\&. By default
+\fBleft\fR
+is used\&.
+.RE
+.PP
+\fB\-E, \-\-passphrase <pass phrase>\fR
+.RS 4
+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
+\fB\-\-key\fR
+and
+\fB\-\-salt\fR\&.
+.RE
+.PP
+\fB\-K, \-\-key <master key>\fR
+.RS 4
+master key to use for key derivation
+
+Master key in hexadecimal notation, e\&.g\&. 01a2b3c4d5e6f708a9b0cadbecfd0fa1, with a mandatory length of 32, 48 or 64 characters (128, 192 or 256 bits)\&.
+.RE
+.PP
+\fB\-A, \-\-salt <master salt>\fR
+.RS 4
+master salt to use for key derivation
+
+Master salt in hexadecimal notation, e\&.g\&. 01a2b3c4d5e6f708a9b0cadbecfd, with a mandatory length of 28 characters (14 bytes)\&.
+.RE
+.PP
+\fB\-c, \-\-cipher <cipher type>\fR
+.RS 4
+payload encryption algorithm
+
+Encryption algorithm used for encrypting the payload
+
+Possible values:
+.PP
+\fBnull\fR
+.RS 4
+no encryption
+.RE
+.PP
+\fBaes\-ctr\fR
+.RS 4
+AES in counter mode with 128 Bits, default value
+.RE
+.PP
+\fBaes\-ctr\-128\fR
+.RS 4
+AES in counter mode with 128 Bits
+.RE
+.PP
+\fBaes\-ctr\-192\fR
+.RS 4
+AES in counter mode with 192 Bits
+.RE
+.PP
+\fBaes\-ctr\-256\fR
+.RS 4
+AES in counter mode with 256 Bits
+.RE
+.RE
+.PP
+\fB\-a, \-\-auth\-algo <algo type>\fR
+.RS 4
+message authentication algorithm
+
+This option sets the message authentication algorithm\&.
+
+If HMAC\-SHA1 is used, the packet length is increased\&. The additional bytes contain the authentication data\&. see
+\fB\-\-auth\-tag\-length\fR
+for more info\&.
+
+Possible values:
+.PP
+\fBnull\fR
+.RS 4
+no message authentication
+.RE
+.PP
+\fBsha1\fR
+.RS 4
+HMAC\-SHA1, default value
+.RE
+.RE
+.PP
+\fB\-b, \-\-auth\-tag\-length <length>\fR
+.RS 4
+The number of bytes to use for the auth tag\&. This value defaults to 10 bytes unless the
+\fBnull\fR
+auth algo is used in which case it defaults to 0\&.
+.RE
+.SH "EXAMPLES"
+.SS "P2P Setup between two unicast enpoints:"
+.sp
+.it 1 an-trap
+.nr an-no-space-flag 1
+.nr an-break-flag 1
+.br
+.ps +1
+\fBHost A:\fR
+.RS 4
+.sp
+uanytun \-r hostb\&.example\&.com \-t tun \-n 192\&.168\&.123\&.1/30 \-c aes\-ctr\-256 \-k aes\-ctr\-256 \e \-E have_a_very_safe_and_productive_day \-e left
+.RE
+.sp
+.it 1 an-trap
+.nr an-no-space-flag 1
+.nr an-break-flag 1
+.br
+.ps +1
+\fBHost B:\fR
+.RS 4
+.sp
+uanytun \-r hosta\&.example\&.com \-t tun \-n 192\&.168\&.123\&.2/30 \-c aes\-ctr\-256 \-k aes\-ctr\-256 \e \-E have_a_very_safe_and_productive_day \-e right
+.RE
+.SS "One unicast and one anycast tunnel endpoint:"
+.sp
+.it 1 an-trap
+.nr an-no-space-flag 1
+.nr an-break-flag 1
+.br
+.ps +1
+\fBUnicast tunnel endpoint:\fR
+.RS 4
+.sp
+uanytun \-r anycast\&.anytun\&.org \-d anytun0 \-t tun \-n 192\&.0\&.2\&.2/30 \-a null \-c null \-w 0 \-e client
+.RE
+.sp
+.it 1 an-trap
+.nr an-no-space-flag 1
+.nr an-break-flag 1
+.br
+.ps +1
+\fBAnycast tunnel endpoints:\fR
+.RS 4
+.sp
+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\&.
+.RE
+.SH "BUGS"
+.sp
+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\&.
+.SH "AUTHORS"
+.sp
+Christian Pointner <equinox@anytun\&.org>
+.SH "RESOURCES"
+.sp
+Main web site: http://www\&.anytun\&.org/
+.SH "COPYING"
+.sp
+Copyright (C) 2008\-2009 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\&.