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Rewrite nroff comments on new lines. Fixes #417, fixes #114

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dmiller 2016-06-22 19:46:59 +00:00
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ncat/docs/ncat.1
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@ -2,12 +2,12 @@
.\" Title: Ncat
.\" Author: [see the "Authors" section]
.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
.\" Date: 03/29/2016
.\" Date: 06/22/2016
.\" Manual: Ncat Reference Guide
.\" Source: Ncat
.\" Language: English
.\"
.TH "NCAT" "1" "03/29/2016" "Ncat" "Ncat Reference Guide"
.TH "NCAT" "1" "06/22/2016" "Ncat" "Ncat Reference Guide"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
@ -115,7 +115,8 @@ arguments tell what to connect to\&.
\fB\fIhostname\fR\fR
is required, and may be a hostname or IP address\&. If
\fB\fIport\fR\fR
is supplied, it must be a decimal port number\&. If omitted, it defaults to 31337\&..\" default port of Ncat.\" 31337
is supplied, it must be a decimal port number\&. If omitted, it defaults to 31337\&.
.\" default port of Ncat.\" 31337
.PP
In listen mode,
\fB\fIhostname\fR\fR
@ -128,17 +129,20 @@ is omitted, it defaults to listening on all available addresses over IPv4 and IP
is omitted, it defaults to 31337\&.
.SH "PROTOCOL OPTIONS"
.PP
\fB\-4\fR (IPv4 only) .\" -4 (Ncat option)
\fB\-4\fR (IPv4 only)
.\" -4 (Ncat option)
.RS 4
Force the use of IPv4 only\&.
.RE
.PP
\fB\-6\fR (IPv6 only) .\" -6 (Ncat option)
\fB\-6\fR (IPv6 only)
.\" -6 (Ncat option)
.RS 4
Force the use of IPv6 only\&.
.RE
.PP
\fB\-U\fR, \fB\-\-unixsock\fR (Use Unix domain sockets) .\" --unixsock (Ncat option) .\" -U (Ncat option)
\fB\-U\fR, \fB\-\-unixsock\fR (Use Unix domain sockets)
.\" --unixsock (Ncat option) .\" -U (Ncat option)
.RS 4
Use Unix domain sockets rather than network sockets\&. This option may be used on its own for stream sockets, or combined with
\fB\-\-udp\fR
@ -148,18 +152,21 @@ mode is in
the section called \(lqUNIX DOMAIN SOCKETS\(rq\&.
.RE
.PP
\fB\-u\fR, \fB\-\-udp\fR (Use UDP) .\" -u (Ncat option) .\" --udp (Ncat option)
\fB\-u\fR, \fB\-\-udp\fR (Use UDP)
.\" -u (Ncat option) .\" --udp (Ncat option)
.RS 4
Use UDP for the connection (the default is TCP)\&.
.RE
.PP
\fB\-\-sctp\fR (Use SCTP) .\" --sctp (Ncat option)
\fB\-\-sctp\fR (Use SCTP)
.\" --sctp (Ncat option)
.RS 4
Use SCTP for the connection (the default is TCP)\&. SCTP support is implemented in TCP\-compatible mode\&.
.RE
.SH "CONNECT MODE OPTIONS"
.PP
\fB\-g \fR\fB\fIhop1\fR\fR\fB[,\fIhop2\fR,\&.\&.\&.]\fR (Loose source routing) .\" -g (Ncat option)
\fB\-g \fR\fB\fIhop1\fR\fR\fB[,\fIhop2\fR,\&.\&.\&.]\fR (Loose source routing)
.\" -g (Ncat option)
.RS 4
Sets hops for IPv4 loose source routing\&. You can use
\fB\-g\fR
@ -168,7 +175,8 @@ once with a comma\-separated list of hops, use
multiple times with single hops to build the list, or combine the two\&. Hops can be given as IP addresses or hostnames\&.
.RE
.PP
\fB\-G \fR\fB\fIptr\fR\fR (Set source routing pointer) .\" -G (Ncat option)
\fB\-G \fR\fB\fIptr\fR\fR (Set source routing pointer)
.\" -G (Ncat option)
.RS 4
Sets the IPv4 source route
\(lqpointer\(rq
@ -176,12 +184,14 @@ for use with
\fB\-g\fR\&. The argument must be a multiple of 4 and no more than 28\&. Not all operating systems support setting this pointer to anything other than four\&.
.RE
.PP
\fB\-p \fR\fB\fIport\fR\fR, \fB\-\-source\-port \fR\fB\fIport\fR\fR (Specify source port) .\" --source-port (Ncat option) .\" -p (Ncat option)
\fB\-p \fR\fB\fIport\fR\fR, \fB\-\-source\-port \fR\fB\fIport\fR\fR (Specify source port)
.\" --source-port (Ncat option) .\" -p (Ncat option)
.RS 4
Set the port number for Ncat to bind to\&.
.RE
.PP
\fB\-s \fR\fB\fIhost\fR\fR, \fB\-\-source \fR\fB\fIhost\fR\fR (Specify source address) .\" --source (Ncat option) .\" -s (Ncat option)
\fB\-s \fR\fB\fIhost\fR\fR, \fB\-\-source \fR\fB\fIhost\fR\fR (Specify source address)
.\" --source (Ncat option) .\" -s (Ncat option)
.RS 4
Set the address for Ncat to bind to\&.
.RE
@ -191,23 +201,27 @@ See
the section called \(lqACCESS CONTROL OPTIONS\(rq
for information on limiting the hosts that may connect to the listening Ncat process\&.
.PP
\fB\-l\fR, \fB\-\-listen\fR (Listen for connections) .\" --listen (Ncat option) .\" -l (Ncat option)
\fB\-l\fR, \fB\-\-listen\fR (Listen for connections)
.\" --listen (Ncat option) .\" -l (Ncat option)
.RS 4
Listen for connections rather than connecting to a remote machine
.RE
.PP
\fB\-m \fR\fB\fInumconns\fR\fR, \fB\-\-max\-conns \fR\fB\fInumconns\fR\fR (Specify maximum number of connections) .\" --max-conns (Ncat option) .\" -m (Ncat option)
\fB\-m \fR\fB\fInumconns\fR\fR, \fB\-\-max\-conns \fR\fB\fInumconns\fR\fR (Specify maximum number of connections)
.\" --max-conns (Ncat option) .\" -m (Ncat option)
.RS 4
The maximum number of simultaneous connections accepted by an Ncat instance\&. 100 is the default (60 on Windows)\&.
.RE
.PP
\fB\-k\fR, \fB\-\-keep\-open\fR (Accept multiple connections) .\" --keep-open (Ncat option) .\" -k (Ncat option)
\fB\-k\fR, \fB\-\-keep\-open\fR (Accept multiple connections)
.\" --keep-open (Ncat option) .\" -k (Ncat option)
.RS 4
Normally a listening server accepts only one connection and then quits when the connection is closed\&. This option makes it accept multiple simultaneous connections and wait for more connections after they have all been closed\&. It must be combined with
\fB\-\-listen\fR\&. In this mode there is no way for Ncat to know when its network input is finished, so it will keep running until interrupted\&. This also means that it will never close its output stream, so any program reading from Ncat and looking for end\-of\-file will also hang\&.
.RE
.PP
\fB\-\-broker\fR (Connection brokering) .\" --broker (Ncat option)
\fB\-\-broker\fR (Connection brokering)
.\" --broker (Ncat option)
.RS 4
Allow multiple parties to connect to a centralised Ncat server and communicate with each other\&. Ncat can broker communication between systems that are behind a NAT or otherwise unable to directly connect\&. This option is used in conjunction with
\fB\-\-listen\fR, which causes the
@ -215,7 +229,8 @@ Allow multiple parties to connect to a centralised Ncat server and communicate w
port to have broker mode enabled\&.
.RE
.PP
\fB\-\-chat\fR (Ad\-hoc \(lqchat server\(rq) .\" --chat (Ncat option)
\fB\-\-chat\fR (Ad\-hoc \(lqchat server\(rq)
.\" --chat (Ncat option)
.RS 4
The
\fB\-\-chat\fR
@ -223,59 +238,69 @@ option enables chat mode, intended for the exchange of text between several user
.RE
.SH "SSL OPTIONS"
.PP
\fB\-\-ssl\fR (Use SSL) .\" --ssl (Ncat option)
\fB\-\-ssl\fR (Use SSL)
.\" --ssl (Ncat option)
.RS 4
In connect mode, this option transparently negotiates an SSL session with an SSL server to securely encrypt the connection\&. This is particularly handy for talking to SSL enabled HTTP servers, etc\&.
.sp
In server mode, this option listens for incoming SSL connections, rather than plain untunneled traffic\&.
.RE
.PP
\fB\-\-ssl\-verify\fR (Verify server certificates) .\" --ssl-verify (Ncat option)
\fB\-\-ssl\-verify\fR (Verify server certificates)
.\" --ssl-verify (Ncat option)
.RS 4
In client mode,
\fB\-\-ssl\-verify\fR
is like
\fB\-\-ssl\fR
except that it also requires verification of the server certificate\&. Ncat comes with a default set of trusted certificates in the file
ca\-bundle\&.crt\&..\" ca-bundle.crt
ca\-bundle\&.crt\&.
.\" ca-bundle.crt
Some operating systems provide a default list of trusted certificates; these will also be used if available\&. Use
\fB\-\-ssl\-trustfile\fR
to give a custom list\&. Use
\fB\-v\fR
one or more times to get details about verification failures\&.
.\" revoked certificates
Ncat does not check for revoked certificates\&..\" certification revocation
Ncat does not check for revoked certificates\&.
.\" certification revocation
.sp
This option has no effect in server mode\&.
.RE
.PP
\fB\-\-ssl\-cert \fR\fB\fIcertfile\&.pem\fR\fR (Specify SSL certificate) .\" --ssl-cert (Ncat option)
\fB\-\-ssl\-cert \fR\fB\fIcertfile\&.pem\fR\fR (Specify SSL certificate)
.\" --ssl-cert (Ncat option)
.RS 4
This option gives the location of a PEM\-encoded certificate files used to authenticate the server (in listen mode) or the client (in connect mode)\&. Use it in combination with
\fB\-\-ssl\-key\fR\&.
.RE
.PP
\fB\-\-ssl\-key \fR\fB\fIkeyfile\&.pem\fR\fR (Specify SSL private key) .\" --ssl-key (Ncat option)
\fB\-\-ssl\-key \fR\fB\fIkeyfile\&.pem\fR\fR (Specify SSL private key)
.\" --ssl-key (Ncat option)
.RS 4
This option gives the location of the PEM\-encoded private key file that goes with the certificate named with
\fB\-\-ssl\-cert\fR\&.
.RE
.PP
\fB\-\-ssl\-trustfile \fR\fB\fIcert\&.pem\fR\fR (List trusted certificates) .\" --ssl-trustfile (Ncat option)
\fB\-\-ssl\-trustfile \fR\fB\fIcert\&.pem\fR\fR (List trusted certificates)
.\" --ssl-trustfile (Ncat option)
.RS 4
This option sets a list of certificates that are trusted for purposes of certificate verification\&. It has no effect unless combined with
\fB\-\-ssl\-verify\fR\&. The argument to this option is the name of a PEM.\" PEM (Privacy Enhanced Mail)
\fB\-\-ssl\-verify\fR\&. The argument to this option is the name of a PEM
.\" PEM (Privacy Enhanced Mail)
file containing trusted certificates\&. Typically, the file will contain certificates of certification authorities, though it may also contain server certificates directly\&. When this option is used, Ncat does not use its default certificates\&.
.RE
.PP
\fB\-\-ssl\-ciphers \fR\fB\fIcipherlist\fR\fR (Specify SSL ciphersuites) .\" --ssl-ciphers (Ncat option)
\fB\-\-ssl\-ciphers \fR\fB\fIcipherlist\fR\fR (Specify SSL ciphersuites)
.\" --ssl-ciphers (Ncat option)
.RS 4
This option sets the list of ciphersuites that Ncat will use when connecting to servers or when accepting SSL connections from clients\&. The syntax is described in the OpenSSL ciphers(1) man page, and defaults to
ALL:!ADH:!LOW:!EXP:!MD5:@STRENGTH
.RE
.SH "PROXY OPTIONS"
.PP
\fB\-\-proxy \fR\fB\fIhost\fR\fR\fB[:\fR\fB\fIport\fR\fR\fB]\fR (Specify proxy address) .\" --proxy (Ncat option)
\fB\-\-proxy \fR\fB\fIhost\fR\fR\fB[:\fR\fB\fIport\fR\fR\fB]\fR (Specify proxy address)
.\" --proxy (Ncat option)
.RS 4
Requests proxying through
\fIhost\fR:\fIport\fR, using the protocol specified by
@ -285,7 +310,8 @@ If no port is specified, the proxy protocol\*(Aqs well\-known port is used (1080
\fB\-\-proxy\-auth\fR\&.
.RE
.PP
\fB\-\-proxy\-type \fR\fB\fIproto\fR\fR (Specify proxy protocol) .\" --proxy-type (Ncat option)
\fB\-\-proxy\-type \fR\fB\fIproto\fR\fR (Specify proxy protocol)
.\" --proxy-type (Ncat option)
.RS 4
In connect mode, this option requests the protocol
\fIproto\fR
@ -301,7 +327,8 @@ http\&. If this option is not used, the default protocol is
http\&.
.RE
.PP
\fB\-\-proxy\-auth \fR\fB\fIuser\fR\fR\fB[:\fIpass\fR]\fR (Specify proxy credentials) .\" --proxy-auth (Ncat option)
\fB\-\-proxy\-auth \fR\fB\fIuser\fR\fR\fB[:\fIpass\fR]\fR (Specify proxy credentials)
.\" --proxy-auth (Ncat option)
.RS 4
In connect mode, gives the credentials that will be used to connect to the proxy server\&. In listen mode, gives the credentials that will be required of connecting clients\&. For use with
\fB\-\-proxy\-type http\fR, the form should be user:pass\&. For
@ -309,7 +336,8 @@ In connect mode, gives the credentials that will be used to connect to the proxy
.RE
.SH "COMMAND EXECUTION OPTIONS"
.PP
\fB\-e \fR\fB\fIcommand\fR\fR, \fB\-\-exec \fR\fB\fIcommand\fR\fR (Execute command) .\" --exec (Ncat option) .\" -e (Ncat option)
\fB\-e \fR\fB\fIcommand\fR\fR, \fB\-\-exec \fR\fB\fIcommand\fR\fR (Execute command)
.\" --exec (Ncat option) .\" -e (Ncat option)
.RS 4
Execute the specified command after a connection has been established\&. The command must be specified as a full pathname\&. All input from the remote client will be sent to the application and responses sent back to the remote client over the socket, thus making your command\-line application interactive over a socket\&. Combined with
\fB\-\-keep\-open\fR, Ncat will handle multiple simultaneous connections to your specified port/application like inetd\&. Ncat will only accept a maximum, definable, number of simultaneous connections controlled by the
@ -317,14 +345,16 @@ Execute the specified command after a connection has been established\&. The com
option\&. By default this is set to 100 (60 on Windows)\&.
.RE
.PP
\fB\-c \fR\fB\fIcommand\fR\fR, \fB\-\-sh\-exec \fR\fB\fIcommand\fR\fR (Execute command via sh) .\" --sh-exec (Ncat option) .\" -c (Ncat option)
\fB\-c \fR\fB\fIcommand\fR\fR, \fB\-\-sh\-exec \fR\fB\fIcommand\fR\fR (Execute command via sh)
.\" --sh-exec (Ncat option) .\" -c (Ncat option)
.RS 4
Same as
\fB\-e\fR, except it tries to execute the command via
/bin/sh\&. This means you don\*(Aqt have to specify the full path for the command, and shell facilities like environment variables are available\&.
.RE
.PP
\fB\-\-lua\-exec \fR\fB\fIfile\fR\fR (Execute a \&.lua script) .\" --lua-exec (Ncat option)
\fB\-\-lua\-exec \fR\fB\fIfile\fR\fR (Execute a \&.lua script)
.\" --lua-exec (Ncat option)
.RS 4
Runs the specified file as a Lua script after a connection has been established, using a built\-in interpreter\&. Both the script\*(Aqs standard input and the standard output are redirected to the connection data streams\&.
.RE
@ -355,7 +385,8 @@ SCTP\&.
.RE
.SH "ACCESS CONTROL OPTIONS"
.PP
\fB\-\-allow \fR\fB\fIhost\fR\fR\fB[,\fIhost\fR,\&.\&.\&.]\fR (Allow connections) .\" --allow (Ncat option)
\fB\-\-allow \fR\fB\fIhost\fR\fR\fB[,\fIhost\fR,\&.\&.\&.]\fR (Allow connections)
.\" --allow (Ncat option)
.RS 4
The list of hosts specified will be the only hosts allowed to connect to the Ncat process\&. All other connection attempts will be disconnected\&. In case of a conflict between
\fB\-\-allow\fR
@ -365,13 +396,15 @@ and
takes precedence\&. Host specifications follow the same syntax used by Nmap\&.
.RE
.PP
\fB\-\-allowfile \fR\fB\fIfile\fR\fR (Allow connections from file) .\" --allowfile (Ncat option)
\fB\-\-allowfile \fR\fB\fIfile\fR\fR (Allow connections from file)
.\" --allowfile (Ncat option)
.RS 4
This has the same functionality as
\fB\-\-allow\fR, except that the allowed hosts are provided in a new\-line delimited allow file, rather than directly on the command line\&.
.RE
.PP
\fB\-\-deny \fR\fB\fIhost\fR\fR\fB[,\fIhost\fR,\&.\&.\&.]\fR (Deny connections) .\" --deny (Ncat option)
\fB\-\-deny \fR\fB\fIhost\fR\fR\fB[,\fIhost\fR,\&.\&.\&.]\fR (Deny connections)
.\" --deny (Ncat option)
.RS 4
Issue Ncat with a list of hosts that will not be allowed to connect to the listening Ncat process\&. Specified hosts will have their session silently terminated if they try to connect\&. In case of a conflict between
\fB\-\-allow\fR
@ -381,7 +414,8 @@ and
takes precedence\&. Host specifications follow the same syntax used by Nmap\&.
.RE
.PP
\fB\-\-denyfile \fR\fB\fIfile\fR\fR (Deny connections from file) .\" --denyfile (Ncat option)
\fB\-\-denyfile \fR\fB\fIfile\fR\fR (Deny connections from file)
.\" --denyfile (Ncat option)
.RS 4
This is the same functionality as
\fB\-\-deny\fR, except that excluded hosts are provided in a new\-line delimited deny file, rather than directly on the command line\&.
@ -397,35 +431,41 @@ m, or
h
to the value to specify milliseconds, seconds, minutes, or hours\&.
.PP
\fB\-d \fR\fB\fItime\fR\fR, \fB\-\-delay \fR\fB\fItime\fR\fR (Specify line delay) .\" --delay (Ncat option) .\" -d (Ncat option)
\fB\-d \fR\fB\fItime\fR\fR, \fB\-\-delay \fR\fB\fItime\fR\fR (Specify line delay)
.\" --delay (Ncat option) .\" -d (Ncat option)
.RS 4
Set the delay interval for lines sent\&. This effectively limits the number of lines that Ncat will send in the specified period\&. This may be useful for low\-bandwidth sites, or have other uses such as coping with annoying
\fBiptables \-\-limit\fR
options\&.
.RE
.PP
\fB\-i \fR\fB\fItime\fR\fR, \fB\-\-idle\-timeout \fR\fB\fItime\fR\fR (Specify idle timeout) .\" --idle-timeout (Ncat option) .\" -i (Ncat option)
\fB\-i \fR\fB\fItime\fR\fR, \fB\-\-idle\-timeout \fR\fB\fItime\fR\fR (Specify idle timeout)
.\" --idle-timeout (Ncat option) .\" -i (Ncat option)
.RS 4
Set a fixed timeout for idle connections\&. If the idle timeout is reached, the connection is terminated\&.
.RE
.PP
\fB\-w \fR\fB\fItime\fR\fR, \fB\-\-wait \fR\fB\fItime\fR\fR (Specify connect timeout) .\" --wait (Ncat option) .\" -w (Ncat option)
\fB\-w \fR\fB\fItime\fR\fR, \fB\-\-wait \fR\fB\fItime\fR\fR (Specify connect timeout)
.\" --wait (Ncat option) .\" -w (Ncat option)
.RS 4
Set a fixed timeout for connection attempts\&.
.RE
.SH "OUTPUT OPTIONS"
.PP
\fB\-o \fR\fB\fIfile\fR\fR, \fB\-\-output \fR\fB\fIfile\fR\fR (Save session data) .\" --output (Ncat option) .\" -o (Ncat option)
\fB\-o \fR\fB\fIfile\fR\fR, \fB\-\-output \fR\fB\fIfile\fR\fR (Save session data)
.\" --output (Ncat option) .\" -o (Ncat option)
.RS 4
Dump session data to a file
.RE
.PP
\fB\-x \fR\fB\fIfile\fR\fR, \fB\-\-hex\-dump \fR\fB\fIfile\fR\fR (Save session data in hex) .\" --hex-dump (Ncat option) .\" -x (Ncat option)
\fB\-x \fR\fB\fIfile\fR\fR, \fB\-\-hex\-dump \fR\fB\fIfile\fR\fR (Save session data in hex)
.\" --hex-dump (Ncat option) .\" -x (Ncat option)
.RS 4
Dump session data in hex to a file\&.
.RE
.PP
\fB\-\-append\-output\fR (Append output) .\" --append-output (Ncat option)
\fB\-\-append\-output\fR (Append output)
.\" --append-output (Ncat option)
.RS 4
Issue Ncat with
\fB\-\-append\-ouput\fR
@ -436,7 +476,8 @@ and/or
and it will append the resulted output rather than truncating the specified output files\&.
.RE
.PP
\fB\-v\fR, \fB\-\-verbose\fR (Be verbose) .\" --verbose (Ncat option) .\" -v (Ncat option)
\fB\-v\fR, \fB\-\-verbose\fR (Be verbose)
.\" --verbose (Ncat option) .\" -v (Ncat option)
.RS 4
Issue Ncat with
\fB\-v\fR
@ -445,40 +486,50 @@ and it will be verbose and display all kinds of useful connection based informat
.RE
.SH "MISC OPTIONS"
.PP
\fB\-C\fR, \fB\-\-crlf\fR (Use CRLF as EOL) .\" --crlf (Ncat option) .\" -C (Ncat option)
\fB\-C\fR, \fB\-\-crlf\fR (Use CRLF as EOL)
.\" --crlf (Ncat option) .\" -C (Ncat option)
.RS 4
This option tells Ncat to convert LF.\" LF line ending
line endings to CRLF.\" CRLF line ending
when taking input from standard input\&..\" standard input
This option tells Ncat to convert LF
.\" LF line ending
line endings to CRLF
.\" CRLF line ending
when taking input from standard input\&.
.\" standard input
This is useful for talking to some stringent servers directly from a terminal in one of the many common plain\-text protocols that use CRLF for end\-of\-line\&.
.RE
.PP
\fB\-h\fR, \fB\-\-help\fR (Help screen) .\" --help (Ncat option) .\" -h (Ncat option)
\fB\-h\fR, \fB\-\-help\fR (Help screen)
.\" --help (Ncat option) .\" -h (Ncat option)
.RS 4
Displays a short help screen with common options and parameters, and then exits\&.
.RE
.PP
\fB\-\-recv\-only\fR (Only receive data) .\" --recv-only (Ncat option)
\fB\-\-recv\-only\fR (Only receive data)
.\" --recv-only (Ncat option)
.RS 4
If this option is passed, Ncat will only receive data and will not try to send anything\&.
.RE
.PP
\fB\-\-send\-only\fR (Only send data) .\" --send-only (Ncat option)
\fB\-\-send\-only\fR (Only send data)
.\" --send-only (Ncat option)
.RS 4
If this option is passed, then Ncat will only send data and will ignore anything received\&. This option also causes Ncat to close the network connection and terminate after EOF is received on standard input\&.
.RE
.PP
\fB\-\-no\-shutdown\fR (Do not shutdown into half\-duplex mode) .\" --no-shutdown (Ncat option)
\fB\-\-no\-shutdown\fR (Do not shutdown into half\-duplex mode)
.\" --no-shutdown (Ncat option)
.RS 4
If this option is passed, Ncat will not invoke shutdown on a socket aftering seeing EOF on stdin\&. This is provided for backward\-compatibility with OpenBSD netcat, which exhibits this behavior when executed with its \*(Aq\-d\*(Aq option\&.
.RE
.PP
\fB\-t\fR, \fB\-\-telnet\fR (Answer Telnet negotiations) .\" -t (Ncat option)
\fB\-t\fR, \fB\-\-telnet\fR (Answer Telnet negotiations)
.\" -t (Ncat option)
.RS 4
Handle DO/DONT WILL/WONT Telnet negotiations\&. This makes it possible to script Telnet sessions with Ncat\&.
.RE
.PP
\fB\-\-version\fR (Display version) .\" --version (Ncat option)
\fB\-\-version\fR (Display version)
.\" --version (Ncat option)
.RS 4
Displays the Ncat version number and exits\&.
.RE
@ -653,9 +704,11 @@ Source is provided to this software because we believe users have a right to kno
.PP
Source code also allows you to port Nmap (which includes Ncat) to new platforms, fix bugs, and add new features\&. You are highly encouraged to send your changes to
<dev@nmap\&.org>
for possible incorporation into the main distribution\&. By sending these changes to Fyodor or one of the Insecure\&.Org development mailing lists, it is assumed that you are offering the Nmap Project (Insecure\&.Com LLC) the unlimited, non\-exclusive right to reuse, modify, and relicense the code\&. Nmap will always be available open source,.\" open source
for possible incorporation into the main distribution\&. By sending these changes to Fyodor or one of the Insecure\&.Org development mailing lists, it is assumed that you are offering the Nmap Project (Insecure\&.Com LLC) the unlimited, non\-exclusive right to reuse, modify, and relicense the code\&. Nmap will always be available open source,
.\" open source
but this is important because the inability to relicense code has caused devastating problems for other Free Software projects (such as KDE and NASM)\&. We also occasionally relicense the code to third parties as discussed in the Nmap man page\&. If you wish to specify special license conditions of your contributions, just say so when you send them\&.
.SS "No Warranty.\" warranty (lack of)"
.SS "No Warranty
.\" warranty (lack of)"
.PP
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 v2\&.0 for more details at
\m[blue]\fB\%http://www.gnu.org/licenses/gpl-2.0.html\fR\m[], or in the
@ -663,20 +716,26 @@ COPYING
file included with Nmap\&.
.SS "Inappropriate Usage"
.PP
Ncat should never be installed with special privileges (e\&.g\&. suid root)\&..\" suid
Ncat should never be installed with special privileges (e\&.g\&. suid root)\&.
.\" suid
That would open up a major security vulnerability as other users on the system (or attackers) could use it for privilege escalation\&.
.SS "Third\-Party Software"
.PP
This product includes software developed by the
\m[blue]\fBApache Software Foundation\fR\m[]\&\s-2\u[2]\d\s+2\&. A modified version of the
\m[blue]\fBLibpcap portable packet capture library\fR\m[]\&\s-2\u[3]\d\s+2.\" libpcap
\m[blue]\fBLibpcap portable packet capture library\fR\m[]\&\s-2\u[3]\d\s+2
.\" libpcap
is distributed along with Ncat\&. The Windows version of Ncat utilized the Libpcap\-derived
\m[blue]\fBWinPcap library\fR\m[]\&\s-2\u[4]\d\s+2.\" WinPcap
\m[blue]\fBWinPcap library\fR\m[]\&\s-2\u[4]\d\s+2
.\" WinPcap
instead\&. Certain raw networking functions use the
\m[blue]\fBLibdnet\fR\m[]\&\s-2\u[5]\d\s+2.\" libdnet
networking library, which was written by Dug Song\&..\" Song, Dug
\m[blue]\fBLibdnet\fR\m[]\&\s-2\u[5]\d\s+2
.\" libdnet
networking library, which was written by Dug Song\&.
.\" Song, Dug
A modified version is distributed with Ncat\&. Ncat can optionally link with the
\m[blue]\fBOpenSSL cryptography toolkit\fR\m[]\&\s-2\u[6]\d\s+2.\" OpenSSL
\m[blue]\fBOpenSSL cryptography toolkit\fR\m[]\&\s-2\u[6]\d\s+2
.\" OpenSSL
for SSL version detection support\&. All of the third\-party software described in this paragraph is freely redistributable under BSD\-style software licenses\&.
.SH "NOTES"
.IP " 1." 4