First public version of Protocol.
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Luis MartinGarcia
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README.txt
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README.txt
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protocol
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========
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################################################################################
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# ____ _ _ #
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# | _ \ _ __ ___ | |_ ___ ___ ___ | | #
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# | |_) | '__/ _ \| __/ _ \ / __/ _ \| | #
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# | __/| | | (_) | || (_) | (_| (_) | | #
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# |_| |_| \___/ \__\___/ \___\___/|_| #
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# #
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# == A Simple ASCII Header Generator for Network Protocols == #
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# #
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################################################################################
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# #
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# Written by: #
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# #
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# Luis MartinGarcia. #
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# -> E-Mail: luis.mgarc@gmail.com #
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# -> WWWW: http://www.luismg.com #
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# -> GitHub: https://github.com/luismartingarcia #
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# #
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################################################################################
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TABLE OF CONTENTS
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0x01 Introduction.............................................................
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0x02 Installing Protocol......................................................
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0x03 Running Protocol.........................................................
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|_ 0x03.1 Displaying Existing Protocols......................................
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|_ 0x03.2 Displaying Custom Protocols........................................
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0x04 Examples.................................................................
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0x05 Support and Bug Reporting................................................
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0x01 - INTRODUCTION
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Protocol is a simple command-line tool that serves two purposes:
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- Provide a simple way for engineers to have a look at standard network
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protocol headers, directly from the command-line, without having to
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google for the relevant RFC or for ugly header image diagrams.
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- Provide a way for researchers and engineers to quickly generate ASCII
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RFC-like header diagrams for their own custom protocols.
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0x02 - DOWNLOADING PROTOCOL
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The latest version of protocol is available via GitHub. It can be downloaded
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directly from the following website clicking on the button "Download ZIP".
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https://github.com/luismartingarcia/protocol
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Alternatively, the code can be checked out using GIT, running the following
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command:
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git clone https://github.com/luismartingarcia/protocol.git
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If prompted for a username and password, don't enter any, just hit Enter.
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Documentation and extra information is always available through the following
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site:
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http://www.luismg.com/protocol
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0x02 - INSTALLING PROTOCOL
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Protocol can be installed by running the included setup.py script as follows:
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setup.py install
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Note that in order to install Protocol, root or administrative privileges
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are required. On GNU/Linux systems, it can be installed as follows:
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sudo ./setup.py install
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0x03 - RUNNING PROTOCOL
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Once installed, Protocol can be run from the command line. The syntax is
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the following:
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protocol <EXISTING_PROTOCOL_NAME(S)>
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or
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protocol <CUSTOM_PROTOCOL_SPECIFICATION(S)>
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The following subsections describe each approach.
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0x03.1 Displaying Existing Protocols
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The first approach lets users print ASCII headers for existing network
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protocols. In particular, the following protocols are available.
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"ethernet" : Ethernet
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"8021q" : IEEE 802.1q
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"dot1q" : IEEE 802.1q
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"tcp" : Transmission Control Protocol (TCP)
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"udp" : User Datagram Protocol (TCP)
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"ip" : Internet Protocol (IP), version 4.
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"ipv6" : Internet Protocol (IP), version 6.
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"icmp" : Internet Control Message Protocol (ICMP)
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"icmp-destination": : ICMP Destination Unreachable
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"icmp-time" : ICMP Time Exceeded
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"icmp-parameter" : ICMP Parameter Problem
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"icmp-source" : ICMP Source Quench
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"icmp-redirect" : ICMP Redirect
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"icmp-echo" : ICMP Echo Request/Reply
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"icmp-timestamp" : ICMP Timestamp Request/Reply
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"icmp-information" : ICMP Information Request/Reply
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"icmpv6" : Internet Control Message Protocol for IPv6 (ICMPv6)
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"icmpv6-destination" : ICMPv6 Destination Unreachable
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"icmpv6-big" : ICMPv6 Packet Too Big
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"icmpv6-time" : ICMPv6 Time Exceeded
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"icmpv6-parameter" : ICMPv6 Parameter Problem
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"icmpv6-echo" : ICMPv6 Echo Request/Reply
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"icmpv6-rsol" : ICMPv6 Router Solicitation
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"icmpv6-radv" : ICMPv6 Router Advertisement
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"icmpv6-nsol" : ICMPv6 Neighbor Solicitation
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"icmpv6-nadv" : ICMPv6 Neighbor Advertisement
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"icmpv6-redirect" : ICMPv6 Redirect
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One or more of the protocols listed above can be printed. Here are a few
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examples:
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protocol tcp
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protocol dot1q
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protocol tcp udp
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protocol ipv6 icmpv6 icmpv6-redirect
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Note that protocol names don't need to be fully specified, as long as there
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is no ambiguity. For example 'protocol et' is equivalent to 'protocol
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ethernet'. Whenever there is ambiguity (e.g. 'protocol icmpv6-r', a list of
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possible options will be displayed.
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$ protocol icmpv6-r
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Ambiguous protocol specifier 'icmpv6-r'. Did you mean any of these?
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icmpv6-radv
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icmpv6-redirect
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icmpv6-rsol
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0x03.1 Displaying Custom Protocols
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Apart from already existing protocols, Protocol can represent any arbitrary
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protocol headers. In order to do that, instead of specifying the name of
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an existing protocol, a custom protocol specification may be supplied. Such
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specification must follow a simple but specific syntax:
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"<LIST_OF_FIELDS>[?OPTIONS]"
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Where [LIST_OF_FIELDS] is a comma-separated list of protocol field names
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and lengths (expressed in bits), and [?OPTIONS] is an optional part that
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allows users to specify format modifiers for the ASCII header. Note that if
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any of the field names contains spaces, the protocol specification must be
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enclosed in double quotes.
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0x03.1.1 Field Lists
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The most important part of a protocol specification are field lists. This
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is just a comma-separated list of name:length tuples, where name represents
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the text that describes the protocol field and can contain any character,
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except for '?' and length is an integer greater than zero, representing the
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number of bits the field takes in the header. Here are a few examples:
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Type:8,Code:8,Checksum:16,Message Body:64
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Source Port:16,Destination Port:16,Length:16,Checksum:16
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Note that there is no whitespace after the commas. This is a restriction
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that must be respected.
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Also, note that field lengths don't need to align to the length of the
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line. If a particular field is too long, Protocol will just wrap it to the
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next line. Here are some examples:
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$ protocol "Source:16,TTL:8,Reserved:40"
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Source | TTL | |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +
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| Reserved |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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$ protocol "Source:16,Reserved:40,TTL:8"
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Source | |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+
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| Reserved | TTL |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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$ protocol "Reserved:32,Target Address:128"
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Reserved |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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+ +
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+ Target Address +
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+ +
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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0x03.1.2 Options
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Once the list of fields has been specified, users may optionally pass
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formatting options to control the way the ASCII header is generated.
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Options are supplied as a comma-separated list of label=value elements.
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The first one is preceded by the '?' sign, which lets Protocol figure out
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where the field list ends and where the list of options begins. The options
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currently available are the following:
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bits=<n> : Number of bits per line. By default it's 32, same as IETF.
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This is useful for protocols that don't align perfectly to
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32-bit words, like Ethernet.
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numbers=<Y/N> : Instructs protocol to print or avoid printing the bit
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counts on top of the header.
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evenchar=<c> : Instructs protocol to use the supplied character, instead
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of the default "-" as the character in even positions of
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the horizontal lines.
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oddchar=<c> : Same as evenchar but for characters in odd positions of the
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horizontal lines. By default it takes the value '+'
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startchar=<c> : Instructs protocol to use the supplied character instead
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of the default "+" for the first position of an horizontal
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line.
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endchar=<c> : Same as startchar but for the character in the last
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position of the horizonal lines.
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sepchar=<c> : Instructs protocol to use the supplied character instead
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of the default "|" for the field separator character.
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The following diagram shows the character modifiers described above.
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Bit counts sepchar(|)
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^ ^ |
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| | |
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| | |
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0 | 1 2 3 |
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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| Source | TTL | Reserved | <-+
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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^ ^ ^ ^ ^ ^ ^ ^
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| | | | | | | |
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startchar(+) evenchar( -) oddchar(+) endchar(+)
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|<------------------------------------------------------------->|
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bits(32)
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0x03.3 Command-line Options
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Apart from per-protocol format specifiers, Protocol can also be configured
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using command-line parameter. The following list provides a description of
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each option available.
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Usage: /usr/local/bin/protocol {<protocol> or <spec>} [OPTIONS]
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PARAMETERS:
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<protocol> : Name of an existing protocol
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<spec> : Field by field specification of non-existing protocol
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OPTIONS:
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-b, --bits <n> : Number of bits per line
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-f, --file : Read specs from a text file
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-h, --help : Displays this help information
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-n, --no-numbers : Do not print bit numbers on top of the header
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-V, --version : Displays current version
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--evenchar <char> : Character for the even positions of horizontal lines
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--oddchar <char> : Character for the odd positions of horizontal lines
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--startchar <char> : Character that starts horizontal lines
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--endchar <char> : Character that ends horizontal lines
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--sepchar <char> : Character that separates protocol fields
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0x04 - EXAMPLES
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This section presents additional examples on how to run protocol.
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$ protocol tcp
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Source Port | Destination Port |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Sequence Number |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Acknowledgment Number |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Offset| Res. | Flags | Window |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Checksum | Urgent Pointer |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Options | Padding |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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$ protocol "Source Port:16,Destination Port:16,Sequence Number:32,\
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Acknowledgment Number:32,Offset:4,Res.:4,Flags:8,Window:16,Checksum:16,\
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Urgent Pointer:16,Options:24,Padding:8"
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Source Port | Destination Port |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Sequence Number |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Acknowledgment Number |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Offset| Res. | Flags | Window |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Checksum | Urgent Pointer |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Options | Padding |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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$ protocol "Field4:4,Field4:4,Field8:8,Field16:16,Field32:32,Field64:64?\
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bits=16,numbers=y,startchar=*,endchar=*,evenchar=-,oddchar=-,sepchar=|"
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0 1
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
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*-------------------------------*
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| Field4| Field4| Field8 |
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*-------------------------------*
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| Field16 |
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*-------------------------------*
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* Field32 *
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*-------------------------------*
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* *
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* Field64 *
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* *
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*-------------------------------*
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$ protocol ip --bits 16
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0 1
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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|Version| IHL |Type of Service|
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Total Length |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Identification |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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|Flags| Fragment Offset |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Time to Live | Protocol |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Header Checksum |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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+ Source Address +
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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+ Destination Address +
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Options |
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+ +-+-+-+-+-+-+-+-+
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| | Padding |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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$ protocol udp --oddchar "-" --startchar "-" --endchar "-"
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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-----------------------------------------------------------------
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| Source Port | Destination Port |
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-----------------------------------------------------------------
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| Length | Checksum |
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-----------------------------------------------------------------
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$ protocol ipv6 --no-numbers
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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|Version| Traffic Class | Flow Label |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Payload Length | Next Header | Hop Limit |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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+ +
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+ Source Address +
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+ +
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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+ +
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+ Destination Address +
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+ +
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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$ protocol udp icmp
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Source Port | Destination Port |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Length | Checksum |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Type | Code | Checksum |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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+ Message Body +
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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0x05 - SUPPORT AND BUG REPORTING
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For any questions, bug reports, bug fixes, feature requests, code
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contributions, etc, please contact me using the e-mail address displayed on
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the header of this file. Please note that Protocol's support is just like
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IP transport: best-effort. I will do my best to deal with your enquiries but
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no guarantees. Special support packages are available for those willing to
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send me real $$$ via Paypal ;-)
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A Simple ASCII Header Generator for Network Protocols
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|
|
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|||
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