icmplib 1.0.1

Easily forge ICMP packets and make your own ping and traceroute.

icmplib

icmplib is a brand new and modern implementation of the ICMP protocol in Python.
Use the built-in functions or build your own, you have the choice!

Root privileges are required to use this library (raw sockets).

Features

• 🌳 Ready-to-use: icmplib offers ready-to-use functions such as the most popular ones: ping, multiping and traceroute.
• 💎 Modern: This library uses the latest technologies offered by Python 3.6+ and is fully object-oriented.
• 🚀 Fast: Each class and function has been designed and optimized to deliver the best performance. Some functions are also multithreaded (like the multiping function). You can ping the world in seconds!
• 🔩 Powerful and evolutive: Easily build your own classes and functions with ICMPv4 and ICMPv6 sockets.
• 🔥 Seamless integration of IPv6: Use IPv6 the same way you use IPv4. Automatic detection is done without impacting performance.
• 🌈 Broadcast support (you must use the ICMPv4Socket class to enable it).
• 🍺 Support of all operating systems. Tested on Linux, macOS and Windows.
• 🤘 No dependency: icmplib is a pure Python implementation of the ICMP protocol. It does not use any external dependencies.

Installation

Install, upgrade and uninstall icmplib with these commands:

$ pip3 install icmplib
$ pip3 install --upgrade icmplib
$ pip3 uninstall icmplib

icmplib requires Python 3.6 or later.

Import icmplib into your project (only import what you need):

# For simple use
from icmplib import ping, multiping, traceroute, Host, Hop

# For advanced use (sockets)
from icmplib import ICMPv4Socket, ICMPv6Socket, ICMPRequest, ICMPReply

# Exceptions
from icmplib import ICMPLibError, ICMPSocketError, \
    SocketPermissionError, SocketBroadcastError, TimeoutExceeded, \
    ICMPError, DestinationUnreachable, TimeExceeded

Built-in functions

Ping

Send ICMP ECHO_REQUEST packets to a network host.

Definition

ping(address, count=4, interval=1, timeout=2, id=PID)

Parameters

• address

  The IP address of the gateway or host to which the message should be sent.

  • Type: str

• count

  The number of ping to perform.

  • Type: int
  • Default: 4

• interval

  The interval in seconds between sending each packet.

  • Type: int or float
  • Default: 1

• timeout

  The maximum waiting time for receiving a reply in seconds.

  • Type: int or float
  • Default: 2

• id

  The identifier of the request. Used to match the reply with the request.
  In practice, a unique identifier is used for every ping process.

  • Type: int
  • Default: PID

Return value

• Host object

  A Host object containing statistics about the desired destination:
  address, min_rtt, avg_rtt, max_rtt, transmitted_packets,
  received_packets, packet_loss, is_alive.

Exceptions

• SocketPermissionError

  If the permissions are insufficient to create a socket.

Example

>>> host = ping('1.1.1.1', count=10, interval=0.2)

>>> host.address              # The IP address of the gateway or host that responded
'1.1.1.1'                     # to the request

>>> host.min_rtt              # The minimum round-trip time
12.2

>>> host.avg_rtt              # The average round-trip time
13.2

>>> host.max_rtt              # The maximum round-trip time
17.6

>>> host.transmitted_packets  # The number of packets transmitted to the destination host
10

>>> host.received_packets     # The number of packets sent by the remote host and received by
9                             # the current host

>>> host.packet_loss          # Packet loss occurs when packets fail to reach their destination
0.1                           # Return a float between 0 and 1 (all packets are lost)

>>> host.is_alive             # Return True if the host is reachable, False otherwise
True

Multiping

Send ICMP ECHO_REQUEST packets to multiple network hosts.

Definition

multiping(addresses, count=2, interval=1, timeout=2, id=PID, max_threads=10)

Parameters

• addresses

  The IP addresses of the gateways or hosts to which messages should be sent.

  • Type: list of str

• count

  The number of ping to perform per address.

  • Type: int
  • Default: 2

• interval

  The interval in seconds between sending each packet.

  • Type: int or float
  • Default: 1

• timeout

  The maximum waiting time for receiving a reply in seconds.

  • Type: int or float
  • Default: 2

• id

  The identifier of the requests. This identifier will be incremented by one for each destination.

  • Type: int
  • Default: PID

• max_threads

  The number of threads allowed to speed up processing.

  • Type: int
  • Default: 10

Return value

• List of Host

  A list of Host objects containing statistics about the desired destinations:
  address, min_rtt, avg_rtt, max_rtt, transmitted_packets,
  received_packets, packet_loss, is_alive.
  The list is sorted in the same order as the addresses passed in parameters.

Exceptions

• SocketPermissionError

  If the permissions are insufficient to create a socket.

Example

>>> hosts = multiping(['10.0.0.5', '127.0.0.1', '::1'])

>>> for host in hosts:
...     if host.is_alive:
...         # See the Host class for details
...         print(f'{host.address} is alive!')
...
...     else:
...         print(f'{host.address} is dead!')
...

# 10.0.0.5 is dead!
# 127.0.0.1 is alive!
# ::1 is alive!

Traceroute

Determine the route to a destination host.

The Internet is a large and complex aggregation of network hardware, connected together by gateways. Tracking the route one's packets follow can be difficult. This function utilizes the IP protocol time to live field and attempts to elicit an ICMP TIME_EXCEEDED response from each gateway along the path to some host.

Definition

traceroute(address, count=3, interval=0.05, timeout=2, id=PID, max_hops=30, fast_mode=False)

Parameters

• address

  The destination IP address.

  • Type: str

• count

  The number of ping to perform per hop.

  • Type: int
  • Default: 3

• interval

  The interval in seconds between sending each packet.

  • Type: int or float
  • Default: 0.05

• timeout

  The maximum waiting time for receiving a reply in seconds.

  • Type: int or float
  • Default: 2

• id

  The identifier of the request. Used to match the reply with the request.
  In practice, a unique identifier is used for every ping process.

  • Type: int
  • Default: PID

• max_hops

  The maximum time to live (max number of hops) used in outgoing probe packets.

  • Type: int
  • Default: 30

• fast_mode

  When this option is enabled and an intermediate router has been reached, skip to the next hop rather than perform additional requests. The count option then becomes the maximum number of requests in case of no responses.

  • Type: bool
  • Default: False

Return value

• List of Hop

  A list of Hop objects representing the route to the desired host. A Hop is a Host object with an additional attribute: a distance. The list is sorted in ascending order according to the distance (in terms of hops) that separates the remote host from the current machine.

Exceptions

• SocketPermissionError

  If the permissions are insufficient to create a socket.

Example

>>> hops = traceroute('1.1.1.1')

>>> print('Distance (ttl)    Address    Average round-trip time')
>>> last_distance = 0

>>> for hop in hops:
...     if last_distance + 1 != hop.distance:
...         print('*** Some routers does not respond')
...
...     # See the Hop class for details
...     print(f'{hop.distance}    {hop.address}    {hop.avg_rtt} ms')
...
...     last_distance = hop.distance
...

# Distance (ttl)    Address                 Average round-trip time
# 1                 10.0.0.1                5.19 ms
# 2                 194.149.169.49          7.55 ms
# 3                 194.149.166.54          12.2 ms
# ***               Some routers does not respond
# 5                 212.73.205.22           22.1 ms
# 6                 1.1.1.1                 13.5 ms

ICMP sockets

If you want to create your own functions and classes using the ICMP protocol, you can use the ICMPv4Socket (for IPv4) and the ICMPv6Socket (for IPv6 only). These classes have many methods and attributes in common. They manipulate ICMPRequest and ICMPReply objects.

                                      ┌─────────────────┐
    ┌─────────────────┐   send(...)   │ ICMPSocket:     │   receive()   ┌─────────────────┐
    │   ICMPRequest   │ ────────────> │ ICMPv4Socket or │ ────────────> │    ICMPReply    │
    └─────────────────┘               │ ICMPv6Socket    │               └─────────────────┘
                                      └─────────────────┘

ICMPRequest

A user-created class that represents an ICMP ECHO_REQUEST.

Definition

ICMPRequest(destination, id, sequence, payload_size=56, timeout=2, ttl=64)

Parameters / Getters

• destination

  The IP address of the gateway or host to which the message should be sent.

  • Type: str

• id

  The identifier of the request. Used to match the reply with the request.
  In practice, a unique identifier is used for every ping process.

  • Type: int

• sequence

  The sequence number. Used to match the reply with the request.
  Typically, the sequence number is incremented for each packet sent during the process.

  • Type: int

• payload_size

  The payload size in bytes.

  • Type: int
  • Default: 56

• timeout

  The maximum waiting time for receiving a reply in seconds.

  • Type: int or float
  • Default: 2

• ttl

  The time to live of the packet in seconds.

  • Type: int
  • Default: 64

Getters only

• time

  The timestamp of the ICMP request. Initialized to zero when creating the request and replaced by ICMPv4Socket or ICMPv6Socket with the time of sending.

  • Type: float

ICMPReply

A class that represents an ICMP reply. Generated from an ICMPSocket object (ICMPv4Socket or ICMPv6Socket).

Definition

ICMPReply(source, id, sequence, type, code, received_bytes, time)

Parameters / Getters

• source

  The IP address of the gateway or host that composes the ICMP message.

  • Type: str

• id

  The identifier of the request. Used to match the reply with the request.

  • Type: int

• sequence

  The sequence number. Used to match the reply with the request.

  • Type: int

• type

  The type of message.

  • Type: int

• code

  The error code.

  • Type: int

• received_bytes

  The number of bytes received.

  • Type: int

• time

  The timestamp of the ICMP reply.

  • Type: float

Methods

• raise_for_status()

  Throw an exception if the reply is not an ICMP ECHO_REPLY.
  Otherwise, do nothing.

  • Raises ICMPv4DestinationUnreachable: If the ICMPv4 reply is type 3.
  • Raises ICMPv4TimeExceeded: If the ICMPv4 reply is type 11.
  • Raises ICMPv6DestinationUnreachable: If the ICMPv6 reply is type 1.
  • Raises ICMPv6TimeExceeded: If the ICMPv6 reply is type 3.
  • Raises ICMPError: If the reply is of another type and is not an ICMP ECHO_REPLY.

ICMPv4Socket

Socket for sending and receiving ICMPv4 packets.

Definition

ICMPv4Socket()

Methods

• __init__()

  Constructor. Automatically called: do not call it directly.

  • Raises SocketPermissionError: If the permissions are insufficient to create the socket.

• __del__()

  Destructor. Automatically called: do not call it directly.

  • Call the close() method.

• send(request)

  Send a request to a host.

  This operation is non-blocking. Use the receive() method to get the reply.

  • Parameter ICMPRequest: The ICMP request you have created.
  • Raises SocketBroadcastError: If a broadcast address is used and the corresponding option is not enabled on the socket (ICMPv4 only).
  • Raises ICMPSocketError: If another error occurs while sending.

• receive()

  Receive a reply from a host.

  This method can be called multiple times if you expect several responses (as with a broadcast address).

  • Raises TimeoutExceeded: If no response is received before the timeout defined in the request. This exception is also useful for stopping a possible loop in case of multiple responses.
  • Raises ICMPSocketError: If another error occurs while receiving.
  • Returns ICMPReply: An ICMPReply object containing the reply of the desired destination. See the ICMPReply class for details.

• close()

  Close the socket. It cannot be used after this call.

Getters / Setters

• broadcast

  Enable or disable the broadcast support on the socket.

  • Type: bool
  • Default: False

ICMPv6Socket

Socket for sending and receiving ICMPv6 packets.

ICMPv6Socket()

Methods

The same methods as for the ICMPv4Socket class.

Exceptions

The library contains many exceptions to adapt to your needs:

ICMPLibError
 ├─ ICMPSocketError
 │  ├─ SocketPermissionError
 │  ├─ SocketBroadcastError
 │  └─ TimeoutExceeded
 │  
 └─ ICMPError
    ├─ DestinationUnreachable
    │  ├─ ICMPv4DestinationUnreachable
    │  └─ ICMPv6DestinationUnreachable
    │   
    └─ TimeExceeded
       ├─ ICMPv4TimeExceeded
       └─ ICMPv6TimeExceeded

• ICMPLibError: Exception class for the icmplib package.
• ICMPSocketError: Base class for ICMP sockets exceptions.
• SocketPermissionError: Raised when the permissions are insufficient to create a socket.
• SocketBroadcastError: Raised when a broadcast address is used and the corresponding option is not enabled on the socket.
• TimeoutExceeded: Raised when a timeout occurs on a socket.
• ICMPError: Base class for ICMP error messages.
• DestinationUnreachable: Destination Unreachable message is generated by the host or its inbound gateway to inform the client that the destination is unreachable for some reason.
• TimeExceeded: Time Exceeded message is generated by a gateway to inform the source of a discarded datagram due to the time to live field reaching zero. A Time Exceeded message may also be sent by a host if it fails to reassemble a fragmented datagram within its time limit.

Use the message method (getter) to retrieve the error message.

ICMPError subclasses have methods to retrieve the response (reply method) and the specific message of the error (message method).

Examples

Sockets in action

def single_ping(address, timeout=2, id=PID):
    # Create an ICMP socket
    socket = ICMPv4Socket()

    # Create a request
    # See the ICMPRequest class for details
    request = ICMPRequest(
        destination=address,
        id=id,
        sequence=1,
        timeout=timeout)

    try:
        socket.send(request)

        # If the program arrives in this section,
        # it means that the packet has been transmitted

        reply = socket.receive()

        # If the program arrives in this section,
        # it means that a packet has been received
        # The reply has the same identifier and sequence number that
        # the query but it can come from an intermediate gateway

        reply.raise_for_status()

        # If the program arrives in this section,
        # it means that the destination host has responded to
        # the request

    except TimeoutExceeded as err:
        # The timeout has been reached
        # Equivalent to print(err.message)
        print(err)

    except DestinationUnreachable as err:
        # The reply indicates that the destination host is
        # unreachable
        print(err)

        # Retrieve the response
        reply = err.reply

    except TimeExceeded as err:
        # The reply indicates that the time to live exceeded
        # in transit
        print(err)

        # Retrieve the response
        reply = err.reply

    except ICMPLibError as err:
        # All other errors
        print(err)

    # Automatic socket closure (garbage collector)

Verbose ping

def verbose_ping(address, count=4, interval=1, timeout=2, id=PID):
    # ICMPRequest uses a payload of 56 bytes by default
    # You can modify it with the payload_size parameter
    print(f'PING {address}: 56 data bytes')

    # Automatic detection of the socket to use
    if is_ipv6_address(address):
        socket = ICMPv6Socket()

    else:
        socket = ICMPv4Socket()

    for sequence in range(count):
        request = ICMPRequest(
            destination=address,
            id=id,
            sequence=sequence,
            timeout=timeout)

        try:
            socket.send(request)
            reply = socket.receive()

            print(f'{reply.received_bytes} bytes from '
                  f'{reply.source}: ', end='')

            reply.raise_for_status()
            round_trip_time = (reply.time - request.time) * 1000

            print(f'icmp_seq={sequence} '
                  f'time={round(round_trip_time, 2)} ms')

            if sequence < count - 1:
                sleep(interval)

        except TimeoutExceeded:
            print(f'Request timeout for icmp_seq {sequence}')

        except ICMPError as err:
            print(err)

        except ICMPLibError:
            print('General failure...')


verbose_ping('1.1.1.1')

# PING 1.1.1.1: 56 data bytes
# 64 bytes from 1.1.1.1: icmp_seq=0 time=10.41 ms
# 64 bytes from 1.1.1.1: icmp_seq=1 time=7.56 ms
# 64 bytes from 1.1.1.1: icmp_seq=2 time=11.81 ms
# 64 bytes from 1.1.1.1: icmp_seq=3 time=10.75 ms

FAQ

How to resolve a FQDN / domain name?

Python has a method to do this in its libraries:

>>> import socket
>>> socket.gethostbyname('github.com')
'140.82.118.4'

Contributing

Comments and enhancements are welcome.

All development is done on GitHub. Use Issues to report problems and submit feature requests. Please include a minimal example that reproduces the bug.

Donate

icmplib is completely free and open source. It has been fully developed on my free time. If you enjoy it, please consider donating to support the development.

• 🍺 Donate via PayPal

License

Copyright 2017-2019 Valentin BELYN.

Code released under the GNU GPLv3 license. See the LICENSE for details.