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node-raw-socket

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Raw sockets for Node.js.

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# raw-socket

This module implements raw sockets for [Node.js][nodejs].

*This module has been created primarily to facilitate implementation of the
[net-ping][net-ping] module.*

This module is installed using [node package manager (npm)][npm]:

# This module contains C++ source code which will be compiled
    # during installation using node-gyp.  A suitable build chain
    # must be configured before installation.
    
    npm install raw-socket

It is loaded using the `require()` function:

var raw = require ("raw-socket");

Raw sockets can then be created, and data sent using [Node.js][nodejs]
`Buffer` objects:

var socket = raw.createSocket ({protocol: raw.Protocol.None});

socket.on ("message", function (buffer, source) {
        console.log ("received " + buffer.length + " bytes from " + source);
    });
    
    socket.send (buffer, 0, buffer.length, "1.1.1.1", function (error, bytes) {
        if (error)
            console.log (error.toString ());
    });

[nodejs]: http://nodejs.org "Node.js"
[net-ping]: https://npmjs.org/package/net-ping "net-ping"
[npm]: https://npmjs.org/ "npm"

# Network Protocol Support

The raw sockets exposed by this module support IPv4 and IPv6.

Raw sockets are created using the operating systems `socket()` function, and
the socket type `SOCK_RAW` specified.

# Raw Socket Behaviour

Raw sockets behave in different ways depending on operating system and
version, and may support different socket options.

Some operating system versions may restrict the use of raw sockets to
privileged users.  If this is the case an exception will be thrown on socket
creation using a message similar to `Operation not permitted` (this message
is likely to be different depending on operating system version).

For MAC OS X platforms, when raw socket creation fails, this module will
re-attempt to create a socket using the `SOCK_DGRAM` socket type for when the
protocol specified is `IPPROTO_ICMP` before throwing an exception.  This
interface on the MAC OS X platform provides non-privileged users access to the
ICMP protocol without requiring root-level access.  More information on this
subject can be found in the MAC OS X [documentation][mac-osx-icmp-ref].

[mac-osx-icmp-ref]: https://developer.apple.com/library/mac/documentation/Darwin/Reference/Manpages/man4/icmp.4.html

The appropriate operating system documentation should be consulted to
understand how raw sockets will behave before attempting to use this module.

# Packet Loss Under Load

Under load raw socket can experience packet loss, this may vary from system to
system depending on hardware.  On some systems the `SO_RCVBUF` socket option to
will help to alleviate packet loss.

# Keeping The [Node.js][nodejs] Event Loop Alive

This module uses the `libuv` library to integrate into the [Node.js][nodejs]
event loop - this library is also used by [Node.js][nodejs].  An underlying
 `libuv` library `poll_handle_t` event watcher is used to monitor the
underlying operating system raw socket used by a socket object.

All the while a socket object exists, and the sockets `close()` method has not
been called, the raw socket will keep the [Node.js][nodejs] event loop alive
which will prevent a program from exiting.

This module exports four methods which a program can use to control this
behaviour.

The `pauseRecv()` and `pauseSend()` methods stop the underlying `poll_handle_t`
event watcher used by a socket from monitoring for readable and writeable
events.  While the `resumeRecv()` and `resumeSend()` methods start the
underlying `poll_handle_t` event watcher used by a socket allowing it to
monitor for readable and writeable events.

Each socket object also exports the `recvPaused` and `sendPaused` boolean
attributes to determine the state of the underlying `poll_handle_t` event
watcher used by a socket.

Socket creation can be expensive on some platforms, and the above methods offer
an alternative to closing and deleting a socket to prevent it from keeping the
[Node.js][nodejs] event loop alive.

The [Node.js][nodejs] [net-ping][net-ping] module offers a concrete example
of using these methods.  Since [Node.js][nodejs] offers no raw socket support
this module is used to implement ICMP echo (ping) support.  Once all ping
requests have been processed by the [net-ping][net-ping] module the
`pauseRecv()` and `pauseSend()` methods are used to allow a program to exit if
required.

The following example stops the underlying `poll_handle_t` event watcher used
by a socket from generating writeable events, however since readable events
will still be watched for the program will not exit immediately:

if (! socket.recvPaused)
        socket.pauseRecv ();

The following can the be used to resume readable events:

if (socket.recvPaused)
        socket.resumeRecv ();

The following example stops the underlying `poll_handle_t` event watcher used
by a socket from generating both readable and writeable events, if no other
event watchers have been setup (e.g. `setTimeout()`) the program will exit.

if (! socket.recvPaused)
        socket.pauseRecv ();
    if (! socket.sendPaused)
        socket.pauseSend ();

The following can the be used to resume both readable and writeable events:

if (socket.recvPaused)
        socket.resumeRecv ();
    if (socket.sendPaused)
        socket.resumeSend ();

When data is sent using a sockets `send()` method the `resumeSend()` method
will be called if the sockets `sendPaused` attribute is `true`, however the
`resumeRecv()` method will not be called regardless of whether the sockets
`recvPaused` attribute is `true` or `false`.

[nodejs]: http://nodejs.org "Node.js"
[net-ping]: http://npmjs.org/package/net-ping "net-ping"

# Constants

The following sections describe constants exported and used by this module.

## raw.AddressFamily

This object contains constants which can be used for the `addressFamily`
option to the `createSocket()` function exposed by this module.  This option
specifies the IP protocol version to use when creating the raw socket.

The following constants are defined in this object:

* `IPv4` - IPv4 protocol
 * `IPv6` - IPv6 protocol

## raw.Protocol

This object contains constants which can be used for the `protocol` option to
the `createSocket()` function exposed by this module.  This option specifies
the protocol number to place in the protocol field of IP headers generated by
the operating system.

The following constants are defined in this object:

* `None` - protocol number 0
 * `ICMP` - protocol number 1
 * `TCP` - protocol number 6
 * `UDP` - protocol number 17
 * `ICMPv6` - protocol number 58

## raw.SocketLevel

This object contains constants which can be used for the `level` parameter to
the `getOption()` and `setOption()` methods exposed by this module.

The following constants are defined in this object:

* `SOL_SOCKET`
 * `IPPROTO_IP`
 * `IPPROTO_IPV6`

## raw.SocketOption

This object contains constants which can be used for the `option` parameter to
the `getOption()` and `setOption()` methods exposed by this module.

The following constants are defined in this object:

* `SO_RCVBUF`
 * `SO_RCVTIMEO`
 * `SO_SNDBUF`
 * `SO_SNDTIMEO`
 * `IP_HDRINCL`
 * `IP_OPTIONS`
 * `IP_TOS`
 * `IP_TTL`
 * `IPV6_TTL`
 * `IPV6_UNICAST_HOPS`
 * `IPV6_V6ONLY`

*The `IPV6_TTL` socket option is not known to be defined by any operating
system, it is provided in convenience to be synonymous with IPv4*

For Windows platforms the following constant is also defined:

* `IPV6_HDRINCL`

For Linux platforms the following constant is also defined:

* `SO_BINDTODEVICE`

# Using This Module

Raw sockets are represented by an instance of the `Socket` class.  This
module exports the `createSocket()` function which is used to create
instances of the `Socket` class.

The module also exports a number of stubs which call through to a number of
functions provided by the operating system, i.e. `htonl()`.

This module also exports a function to generate protocol checksums.

## raw.createChecksum (bufferOrObject, [bufferOrObject, ...])

The `createChecksum()` function creates and returns a 16 bit one's complement
of the one's complement sum for all the data specified in one or more
[Node.js][nodejs] `Buffer` objects.  This is useful for creating checksums for
protocols such as IP, TCP, UDP and ICMP.

The `bufferOrObject` parameter can be one of two types.  The first is a
[Node.js][nodejs] `Buffer` object.  In this case a checksum is calculated from
all the data it contains.  The `bufferOrObject` parameter can also be an
object which must contain the following attributes:

* `buffer` - A [Node.js][nodejs] `Buffer` object which contains data which
   to generate a checksum for
 * `offset` - Skip this number of bytes from the beginning of `buffer`
 * `length` - Only generate a checksum for this number of bytes in `buffer`
   from `offset`

The second parameter type provides control over how much of the data in a
[Node.js][nodejs] `Buffer` object a checksum should be generated for.

When more than one parameter is passed a single checksum is calculated as if
the data in in all parameters were in a single buffer.  This is useful for
when calulating checksums for TCP and UDP for example - where a psuedo header
must be created and used for checksum calculation.

In this case two buffers can be passed, the first containing the psuedo header
and the second containing the real TCP packet, and the offset and length
parameters used to specify the bounds of the TCP packet payload.

The following example generates a checksum for a TCP packet and its psuedo
header:

var sum = raw.createChecksum (pseudo_header, {buffer: tcp_packet,
            offset: 20, length: tcp_packet.length - 20});

Both buffers will be treated as one, i.e. as if the data at offset `20` in
`tcp_packet` had followed all data in `pseudo_header` - as if they were one
buffer.

## raw.writeChecksum (buffer, offset, checksum)

The `writeChecksum()` function writes a checksum created by the
`raw.createChecksum()` function to the [Node.js][nodejs] `Buffer` object 
`buffer` at offsets `offset` and `offset` + 1.

The following example generates and writes a checksum at offset `2` in a
[Node.js][nodejs] `Buffer` object:

raw.writeChecksum (buffer, 2, raw.createChecksum (buffer));

## raw.htonl (uint32)

The `htonl()` function converts a 32 bit unsigned integer from host byte
order to network byte order and returns the result.  This function is simply
a stub through to the operating systems `htonl()` function.

## raw.htons (uint16)

The `htons()` function converts a 16 bit unsigned integer from host byte
order to network byte order and returns the result.  This function is simply
a stub through to the operating systems `htons()` function.

## raw.ntohl (uint32)

The `ntohl()` function converts a 32 bit unsigned integer from network byte
order to host byte order and returns the result.  This function is simply
a stub through to the operating systems `ntohl()` function.

## raw.ntohs (uint16)

The `ntohs()` function converts a 16 bit unsigned integer from network byte
order to host byte order and returns the result.  This function is simply
a stub through to the operating systems `ntohs()` function.

## raw.createSocket ([options])

The `createSocket()` function instantiates and returns an instance of the
`Socket` class:

// Default options
    var options = {
        addressFamily: raw.AddressFamily.IPv4,
        protocol: raw.Protocol.None,
        bufferSize: 4096,
        generateChecksums: false,
        checksumOffset: 0
    };
    
    var socket = raw.createSocket (options);

The optional `options` parameter is an object, and can contain the following
items:

* `addressFamily` - Either the constant `raw.AddressFamily.IPv4` or the
   constant `raw.AddressFamily.IPv6`, defaults to the constant
   `raw.AddressFamily.IPv4`
 * `protocol` - Either one of the constants defined in the `raw.Protocol`
   object or the protocol number to use for the socket, defaults to the
   consant `raw.Protocol.None`
 * `bufferSize` - Size, in bytes, of the sockets internal receive buffer,
   defaults to 4096
 * `generateChecksums` - Either `true` or `false` to enable or disable the
   automatic checksum generation feature, defaults to `false`
 * `checksumOffset` - When `generateChecksums` is `true` specifies how many
   bytes to index into the send buffer to write automatically generated
   checksums, defaults to `0`

An exception will be thrown if the underlying raw socket could not be created.
The error will be an instance of the `Error` class.

The `protocol` parameter, or its default value of the constant
`raw.Protocol.None`, will be specified in the protocol field of each IP
header.

## socket.on ("close", callback)

The `close` event is emitted by the socket when the underlying raw socket
is closed.

No arguments are passed to the callback.

The following example prints a message to the console when the socket is
closed:

socket.on ("close", function () {
        console.log ("socket closed");
    });

## socket.on ("error", callback)

The `error` event is emitted by the socket when an error occurs sending or
receiving data.

The following arguments will be passed to the `callback` function:

* `error` - An instance of the `Error` class, the exposed `message` attribute
   will contain a detailed error message.

The following example prints a message to the console when an error occurs,
after which the socket is closed:

socket.on ("error", function (error) {
        console.log (error.toString ());
        socket.close ();
    });

## socket.on ("message", callback)

The `message` event is emitted by the socket when data has been received.

The following arguments will be passed to the `callback` function:

* `buffer` - A [Node.js][nodejs] `Buffer` object containing the data
   received, the buffer will be sized to fit the data received, that is the
   `length` attribute of buffer will specify how many bytes were received
 * `address` - For IPv4 raw sockets the dotted quad formatted source IP
   address of the message, e.g `192.168.1.254`, for IPv6 raw sockets the
   compressed formatted source IP address of the message, e.g.
   `fe80::a00:27ff:fe2a:3427`

The following example prints received messages in hexadecimal to the console:

socket.on ("message", function (buffer, address) {
        console.log ("received " + buffer.length + " bytes from " + address
                + ": " + buffer.toString ("hex"));
    });

## socket.generateChecksums (generate, offset)

The `generateChecksums()` method is used to specify whether automatic checksum
generation should be performed by the socket.

The `generate` parameter is either `true` or `false` to enable or disable the
feature.  The optional `offset` parameter specifies how many bytes to index
into the send buffer when writing the generated checksum to the send buffer.

The following example enables automatic checksum generation at offset 2
resulting in checksums being written to byte 3 and 4 of the send buffer
(offsets start from 0, meaning byte 1):

socket.generateChecksums (true, 2);

## socket.getOption (level, option, buffer, length)

The `getOption()` method gets a socket option using the operating systems
`getsockopt()` function.

The `level` parameter is one of the constants defined in the `raw.SocketLevel`
object.  The `option` parameter is one of the constants defined in the
`raw.SocketOption` object.  The `buffer` parameter is a [Node.js][nodejs]
`Buffer` object where the socket option value will be written.  The `length`
parameter specifies the size of the `buffer` parameter.

If an error occurs an exception will be thrown, the exception will be an
instance of the `Error` class.

The number of bytes written into the `buffer` parameter is returned, and can
differ from the amount of space available.

The following example retrieves the current value of `IP_TTL` socket option:

var level = raw.SocketLevel.IPPROTO_IP;
    var option = raw.SocketOption.IP_TTL;
    
    # IP_TTL is a signed integer on some platforms so a 4 byte buffer is used
    var buffer = new Buffer (4);
    
    var written = socket.getOption (level, option, buffer, buffer.length);
    
    console.log (buffer.toString ("hex"), 0, written);

## socket.send (buffer, offset, length, address, beforeCallback, afterCallback)

The `send()` method sends data to a remote host.

The `buffer` parameter is a [Node.js][nodejs] `Buffer` object containing the
data to be sent.  The `length` parameter specifies how many bytes from
`buffer`, beginning at offset `offset`, to send.  For IPv4 raw sockets the
`address` parameter contains the dotted quad formatted IP address of the
remote host to send the data to, e.g `192.168.1.254`, for IPv6 raw sockets the
`address` parameter contains the compressed formatted IP address of the remote
host to send the data to, e.g. `fe80::a00:27ff:fe2a:3427`.  If provided the
optional `beforeCallback` function is called right before the data is actually
sent using the underlying raw socket, giving users the opportunity to perform
pre-send actions such as setting a socket option, e.g. the IP header TTL.  No
arguments are passed to the `beforeCallback` function.  The `afterCallback`
function is called once the data has been sent.  The following arguments will
be passed to the `afterCallback` function:

* `error` - Instance of the `Error` class, or `null` if no error occurred
 * `bytes` - Number of bytes sent

The following example sends a ICMP ping message to a remote host, before the
request is actually sent the IP header TTL is modified, and modified again
after the data has been sent:

// ICMP echo (ping) request, checksum should be ok
    var buffer = new Buffer ([
            0x08, 0x00, 0x43, 0x52, 0x00, 0x01, 0x0a, 0x09,
            0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
            0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70,
            0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x61,
            0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69]);

var socketLevel = raw.SocketLevel.IPPROTO_IP
    var socketOption = raw.SocketOption.IP_TTL;

function beforeSend () {
        socket.setOption (socketLevel, socketOption, 1);
    }
    
    function afterSend (error, bytes) {
        if (error)
            console.log (error.toString ());
        else
            console.log ("sent " + bytes + " bytes");
        
        socket.setOption (socketLevel, socketOption, 1);
    }

socket.send (buffer, 0, buffer.length, target, beforeSend, afterSend);

## socket.setOption (level, option, buffer, length)

The `setOption()` method sets a socket option using the operating systems
`setsockopt()` function.

The `level` parameter is one of the constants defined in the `raw.SocketLevel`
object.  The `option` parameter is one of the constants defined in the
`raw.SocketOption` object.  The `buffer` parameter is a [Node.js][nodejs]
`Buffer` object where the socket option value is specified.  The `length`
parameter specifies how much space the option value occupies in the `buffer`
parameter.

If an error occurs an exception will be thrown, the exception will be an
instance of the `Error` class.

The following example sets the value of `IP_TTL` socket option to `1`:

var level = raw.SocketLevel.IPPROTO_IP;
    var option = raw.SocketOption.IP_TTL;
    
    # IP_TTL is a signed integer on some platforms so a 4 byte buffer is used,
    # x86 computers use little-endian format so specify bytes reverse order
    var buffer = new Buffer ([0x01, 0x00, 0x00, 0x00]);
    
    socket.setOption (level, option, buffer, buffer.length);

To avoid dealing with endianess the `setOption()` method supports a three
argument form which can be used for socket options requiring a 32bit unsigned
integer value (for example the `IP_TTL` socket option used in the previous
example).  Its signature is as follows:

socket.setOption (level, option, value)

The previous example can be re-written to use this form:

var level = raw.SocketLevel.IPPROTO_IP;
    var option = raw.SocketOption.IP_TTL;

socket.setOption (level, option, 1);

# Example Programs

Example programs are included under the modules `example` directory.

# Changes

## Version 1.0.0 - 29/01/2013

* Initial release

## Version 1.0.1 - 01/02/2013

* Move `SOCKET_ERRNO` define from `raw.cc` to `raw.h`
 * Error in exception thrown by `SocketWrap::New` in `raw.cc` stated that two
   arguments were required, this should be one
 * Corrections to the README.md
 * Missing includes causes compilation error on some systems (maybe Node
   version dependant)

## Version 1.0.2 - 02/02/2013

* Support automatic checksum generation

## Version 1.1.0 - 13/02/2013

* The [net-ping][net-ping] module is now implemented so update the note about
   it in the first section of the README.md
 * Support IPv6
 * Support the `IP_HDRINCL` socket option via the `noIpHeader` option to the
   `createSocket()` function and the `noIpHeader()` method exposed by the
   `Socket` class

## Version 1.1.1 - 14/02/2013

* IP addresses not being validated

## Version 1.1.2 - 15/02/2013

* Default protocol option to `createSession()` was incorrect in the README.md
 * The `session.on("message")` example used `message` instead of `buffer` in
   the README.md

## Version 1.1.3 - 04/03/2013

* `raw.Socket.onSendReady()` emit's an error when `raw.SocketWrap.send()`
   throws an exception when it should call the `req.callback` callback
 * Added the `pauseRecv()`, `resumeRecv()`, `pauseSend()` and `resumeSend()`
   methods

[net-ping]: https://npmjs.org/package/net-ping "net-ping"

## Version 1.1.4 - 05/03/2013

* Cleanup documentation for the `pauseSend()`, `pauseRecv()`, `resumeSend()`
   and `resumeRecv()` methods in the README.md

## Version 1.1.5 - 09/05/2013

* Reformated lines in the README.md file inline with the rest of the file
 * Removed the `noIpHeader()` method (the `setOption()` method should be
   used to configure the `IP_HDRINCL` socket option - and possibly
   `IPV6_HDRINCL` on Windows platforms), and removed the `Automatic IP Header
   Generation` section from the README.md file
 * Added the `setOption()` and `getOption()` methods, and added the
   `SocketLevel` and `SocketOption` constants
 * Tidied up the example program `ping-no-ip-header.js` (now uses the
   `setOption()` method to configure the `IP_HDRINCL` socket option)
 * Tidied up the example program `ping6-no-ip-header.js` (now uses the
   `setOption()` method to configure the `IPV6_HDRINCL` socket option)
 * Added the example program `get-option.js`
 * Added the example program `ping-set-option-ip-ttl.js`
 * Use MIT license instead of GPL

## Version 1.1.6 - 18/05/2013

* Added the `beforeCallback` parameter to the `send()` method, and renamed the
   `callback` parameter to `afterCallback`
 * Fixed a few typos in the README.md file
 * Modified the example program `ping-set-option-ip-ttl.js` to use the
   `beforeCallback` parameter to the `send()` method
 * The example program `ping6-no-ip-header.js` was not passing the correct
   arguments to the `setOption()` method

## Version 1.1.7 - 23/06/2013

* Added the `htonl()`, `htons()`, `ntohl()`, and `ntohs()` functions, and
   associated example programs
 * Added the `createChecksum()` function, and associated example program

## Version 1.1.8 - 01/07/2013

* Added the `writeChecksum()` function
 * Removed the "Automated Checksum Generation" feature - this has been
   replaced with the `createChecksum()` and `writeChecksum()` functions

## Version 1.2.0 - 02/07/2013

* Up version number to 1.2.0 (we should have done this for 1.1.8 because it
   introduced some API breaking changes)

## Version 1.2.1 - 15/08/2013

* Receiving `Assertion '!(handle->flags & (UV_CLOSING | UV_CLOSED))' failed`
   error after a number of pings - the underlying `uv_poll_t` handle was being
   closed twice

## Version 1.2.2 - 21/09/2013

* Using uint16_t instead of uint32_t on line 87 in src/raw.cc for a value
   that is out of range
 * raw::SocketWrap::pause() only uses the first argument
 * Delete uv_poll_t watcher in uv_close() OnClose callback instead of in the
   wrapped C++ objects deconstructor

## Version 1.3.0 - 10/07/2015

* Support Node.js 0.12.x using the Native Abstractions for Node interface
 * Added export for the `SO_BINDTODEVICE` socket option for Linux platforms
 * On MAC OS X platforms re-attempt to create a socket using `SOCK_DGRAM`
   instead of `SOCK_RAW` when `IPPROTO_ICMP` was requested by the user, this
   provides non-privileged users access to the ICMP protocol on this platform

## Version 1.3.1 - 10/07/2015

* Missing bracket for when compiling under the MAC OS X platform :(

## Version 1.3.2 - 03/08/2015

* Add version dependency "<2.0.0" for the "nan" module to prevent build
   failures during installation because of breaking API changes

## Version 1.3.3 - 22/09/2015

* Host repository on GitHub

## Version 1.4.0 - 09/10/2015

* Support Native Abstractions for Node 2.x
 * Add-on module crashes when emitting `close` events during garbage collection
   of a wrapped object
 * Support Node.js 4.x

## Version 1.5.0 - 15/05/2016

* Require nan 2.3.x to support node version 6

## Version 1.5.1 - 16/11/2016

* Explicitly publish to npm using UNIX line endings

## Version 1.5.2 - 11/01/2018

* Add note to README.md on how to reduce packet loss using the `SO_RCVBUF`
   socket option
 * Address warnings for `v8::Value::ToUint32 was declared deprecated`

## Version 1.6.0 - 02/05/2018

* Support Node.js 10

## Version 1.6.1 - 06/06/2018

* Set NoSpaceships Ltd to be the owner and maintainer

## Version 1.6.2 - 07/06/2018

* Remove redundant sections from README.md

## Version 1.6.3 - 03/10/2018

* Include addon `.node` file extension for node-webkit compatibility

## Version 1.6.4 - 02/11/2018

* Prevent assertion failures when closing a socket and calling pauseRecv()

## Version 1.7.0 - 12/06/2019

* Support Node.js 12 using nan 2.14

## Version 1.8.1 - 08/04/2024

* Use nan 2.19.* to support up to Node.js 21

# License

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

node-raw-socket

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