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Documentation update.
This commit is contained in:
Pavel Machek
parent
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d150c6379c
97
TODO
97
TODO
@ -56,3 +56,100 @@ OSPF
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- RFC1587 NSSA areas
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- RFC2370 opaque LSA's
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- respect interface MTU and try not to create larger packets unless unavoidable
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Documentation (sorry, its in czech)
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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K SGML:
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o Mohl bys, prosim, nekam napsat, co je vsechno potreba udelat, aby bylo
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dokumentaci mozno postavit? Skoncil jsem u toho, ze jsem do doc/sbase/
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zkopiroval spoustu souboru z /usr/lib/sgml-tools a pridal nekolik symlinku
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-- ted uz sice dokumentaci vygeneruji, ale asi to neni ta spravna cesta.
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K HTML:
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o "2000" zcela vypadava mimo hlavicku.
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Uvod:
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o "What is bird": tam by melo byt receno, _co_ je BIRD, nikoliv cemu se podoba.
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To obnasi jednak par vet o tom, o co se vlastne snazi, potom nejaky feature
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list (s odkazy do jednotlivych casti dokumentace?) a tez neco na tema "v cem
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jsme lepsi nez konkurence" (a neargumentovat pouze licenci :) ).
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Rovnez tak neni vubec urcen jen pro unixove systemy -- je velice portabilni
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a shodou okolnosti Unix (presneji Linux) je jediny zatim napsany port.
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o Chybi sekce popisujici instalaci, spousteni a command-line options.
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o "About routing tables" by melo byt podstatne podrobnejsi (vysvetlit, co vlastne
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routovaci tabulky jsou, co obsahuji, ze vubec existuji nejake atributy, k cemu
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slouzi, ze nektere tabulky jsou synchronizovane s kernelem, zatimco jine nikoliv,
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ze lze prenaset routy mezi tabulkami (odkaz na protokol pipe), ze k tabulkam
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jsou pres filtry pripojeny protokoly atd.) Asi z toho udelat samostatnou kapitolu.
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o Zminit logy a kategorie hlasek.
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Filtry:
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o Na zacatku zejmena vysvetlit, jak jsou filtry do systemu zapojeny, k cemu slouzi,
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ze dostanou routu a ocekava se od nich verdikt. Teprve pak vysvetlovat, ze to
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jsou programy, ze mohou volat funkce atd. Tez zminit, ze protokol ma pravo
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nektere routy akceptovat/odmitnout bez toho, aniz by se zeptal filtru.
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o Napsat neco o tom, jak filtry debugovat -- ze existuje trasovani filtru
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a CLI command pro vypsani routovaci tabulky tak, jak projde filtrem ci tak,
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jak ji vidi dany protokol.
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o `filters internally work ...' patri do progdoc.
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o Vysvetlit nesting a zastinovani.
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o Nadefinovat, co se stane, kdyz funkce nevrati hodnotu, i kdyz ma.
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o Popsat runtime errory a ze se chovaji jako rejecty.
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o Typy: tez rici, ze integery se lisi nejen od booleanu, ale take od enumu.
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o Boolean: TRUE nebo true? U kazdeho typu zminit, jak vypadaji literaly
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tohoto typu a psat je vzdycky tt fontem.
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o int: Nadefinovat rozsah a rici, ze preteceni se nekontroluje. Zminit
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hexadecimalni konstanty.
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o ip: IPv4/IPv6 nezavisi na verzi BIRDa, nybrz na compile-time konfiguraci.
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o ip: .mask zminit zvlast mezi specialnimi operatory.
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o set: lepe vysvetlit matchovani prefixu, ukazat na prikladu.
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o bgppath: list of autonomous system _numbers_
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o bgpmask: vysvetlit matchovani.
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o operations: prejmenovat na `operators', mela by to asi byt tabulka
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operatoru, u kazdeho receno, na jakych typech je definovan a jakeho
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typu je vysledek.
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o operations: ~ pracuje i na clistech, neni-liz pravda?
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o Examply by mohly byt krapet smysluplnejsi.
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o defined(): To, ze undefined attribute cannot be accessed, by melo byt
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rozhodne receno nekde jinde (v uvodu sekce) -- vzdyt u defined samotneho
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to mozne je.
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o attributes: nemyslim, ze jsou vsechny -- co treba scope a preference?
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o Chybi operace na clistech a cestach.
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o print: a coz takhle printn apod.?
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o Mezi prikazy nikde neni zminen napriklad accept a reject.
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o Co se stane, kdyz filtr skonci, aniz by vydal verdikt?
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Protocols:
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o U kazdeho protokolu rici, jestli podporujeme pouze IPv4 nebo i IPv6 verzi.
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o RIP: Vysvetlit, na ktere site se RIP hodi a na ktere ne, rici, ze je
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hodnoty spise historicke, ale ze ve svete IPv6 se bezne pouziva, protoze
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zatim neexistuji slusne implementace OSPFv3.
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o RIP: Per-interface optiony uvadet tez jako definition list.
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o RIP: U RIP-specific atributu zminit, jakeho jsou typu a jak vznikaji.
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o Example u RIPu je out of date: `honour' -> `honor' apod. Tez ukazat
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per-interface optiony.
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o passwords: syntaxe data uz, tusim, davno vypada jinak.
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Struktura dokumentace:
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o Chybi kapitola o CLI a o clientovi.
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o Na konci (nebo ve zvlast sekci pro kazdy protokol?) by mel byt seznam referenci
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na vsechny mozne dokumenty, zejmena vsak vsechna RFC, kterymi se ridime nebo
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ktera maji neco spolecneho s tim, co delame (napriklad RPSL).
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K jazyku:
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o K "BIRD Internet Routing Daemon" by mel patrit urcity clen.
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o Nerika se `comparation', nybrz `comparison'.
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o RFC (a ostatni zkratky) psat vzdy velkymi pismeny.
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o Pokud je v zavorce cela veta, patri pred ')' tecka, pokud neni, tak
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nepatri.
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o Davej si pozor na rody -- router je vzdycky `it', nikdy `he'.
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@ -1,7 +1,7 @@
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<!doctype linuxdoc system>
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<!--
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Bird documentation
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BIRD documentation
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Look for "about this documentation" section to learn more.
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@ -13,7 +13,7 @@
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<article>
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<title>Bird
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<title>BIRD
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<author>
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Pavel Machek <tt/pavel@ucw.cz/
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@ -29,15 +29,15 @@ This document contains documentation for BIRD Internet Routing Daemon
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<sect>Introduction
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<sect1>What is bird
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<sect1>What is BIRD
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<p><label id="intro"> You may wonder what 'bird' means. It is acronym of 'BIRD Internet Routing
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<p><label id="intro"> You may wonder what 'BIRD' means. It is acronym of 'BIRD Internet Routing
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Daemon', and we think that's cool name. Its task is similar to what firmware of Cisco routers does,
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or what gated <HTMLURL URL="http://www.gated.org/"> or GNU zebra <HTMLURL
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URL="http://www.zebra.org/"> does. However, you can not run Cisco's firmware on "normal" computer
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and gated is really hard to configure and comes under wrong license. Bird is being developed on
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and gated is really hard to configure and comes under wrong license. BIRD is being developed on
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Charles University, Prague, and can be freely distributed under terms of GNU General Public
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License. Bird is designed to run on Unix and unix-like systems, it is primarily developed on Linux.
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License. BIRD is designed to run on Unix and unix-like systems, it is primarily developed on Linux.
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<sect1>About this documentation
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@ -61,6 +61,12 @@ section in filters.
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<sect1>Introduction
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<p>BIRD is configured using text configuration file. At startup, BIRD reads <file/bird.conf/ (unless
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-c command line parameter is given). Configuration may be changed on user request: if you modify
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config file and then signal BIRD with SIGHUP, it will adjust to new config. There's BIRD client,
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which allows you to talk with BIRD in more extensive way than just telling it to reconfig. BIRD
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writes messages about its work to log files or syslog (according to config).
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<p>Bird is configured using text configuration file. At startup, bird
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reads <file/bird.conf/ (unless -c command line parameter is
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given). Everything on a line after <cf/#/ is a comment, whitespace is
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@ -68,13 +74,11 @@ ignored, C-style comments <cf>/* comment */</cf> are also
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recognized. If there's variable number of options, it is grouped using
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<cf/{ }/ brackets. Each option is terminated by <cf/;/.
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<p>Really simple configuration file might look like this, you can find
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example of more complicated configuration file in
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<file>doc/bird.conf.example</file>.
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<p>Really simple configuration file might look like this:
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<code>
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protocol kernel {
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persist; # Don't remove routes on bird shutdown
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persist; # Don't remove routes on BIRD shutdown
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scan time 20; # Scan kernel routing table every 20 seconds
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export all; # Default is export none
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}
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@ -98,42 +102,44 @@ protocol rip {
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<cf/debug/ for debugging message, <cf/trace/, <cf/info/,
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<cf/remote/ for messages about misbehavior of remote side, <cf/warning/,
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<cf/error/, <cf/auth/, <cf/fatal/, <cf/bug/ for internal bugs
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of bird. You may specify more than one <cf/log/ line to log to multiple
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of BIRD. You may specify more than one <cf/log/ line to log to multiple
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destinations.
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<tag>debug protocols all|off|{ states, routes, filters, interfaces, events, packets }</tag>
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sets global default of debugging options.
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sets global default of protocol debugging options.
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<tag>filter <m/name/{ <m/commands/ }</tag> define filter. You can learn more about filters
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in next chapter.
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<tag>protocol rip|ospf|bgp <m/[name]/ { <m>protocol options</m> }</tag> define protocol
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<tag>protocol rip|ospf|bgp|... <m/[name]/ { <m>protocol options</m> }</tag> define protocol
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instance, called name (or called something like rip5 if you omit name). You can learn more
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about configuring protocols in their own chapters.
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about configuring protocols in their own chapters. You can run more than one instance of
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most protocols (like rip or bgp).
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<tag>define constant = expression</tag> define constant. You can use it later in every place
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you could use simple integer.
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<tag>router id <m/num.num.num.num/</tag> set router id. Router
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id needs to be world-wide unique 32bit number, identifying
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router. It is usually one of router's IP addresses.
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<tag>router id <m/IPv4 address/</tag> set router id. Router id needs to be world-wide
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unique. It is usually one of router's IPv4 addresses.
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<tag>table <m/name/</tag> create new routing table.
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<tag>eval <m/expr/</tag> evaluates given filter expression. It is used for testing.
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</descrip>
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<sect1>Per-protocol options
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<sect1>Protocol options
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<p>Several options are per-protocol, but all protocols support them. They are described here.
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<descrip>
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<tag>preference <m/expr/</tag> sets preference of this protocol.
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<tag>preference <m/expr/</tag> sets preference of routes generated by this protocol.
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<tag>disabled</tag> disables given protocol.
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<tag>disabled</tag> disables given protocol. You can disable/enable protcol from command
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line interface without needing to touch config.
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<tag>debug <m/setting/</tag> this is similar to global debug setting, except that it only
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affects one protocol.
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affects one protocol. Only messages in selected debugging categories will be written to
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logs.
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<tag>import <m/filter/</tag> filter can be either either <cf> { <m>filter commands</m>
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}</cf> or <cf>filter <m/name/</cf>. Import filter works in direction from protocol to main
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@ -153,18 +159,20 @@ protocol rip {
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time from which password is not announced but is allowed. id is password id, as needed by
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certain protocols.
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<tag>interface "<m/mask/" [ { <m/option/ ; [ ... ] } ]</tag> specifies, which interfaces
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this protocol is active at, and allows you to set options on interface-by-interface
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basis. Mask is specified in shell-like patters, thus <cf>interface "*" { mode broadcast;
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};</cf> will start given protocol on all interfaces, with <cf>mode broadcast;</cf> option.
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<tag>interface "<m/mask/"|<m/prefix/ [ { <m/option/ ; [ ... ] } ]</tag> specifies, which
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interfaces this protocol is active at, and allows you to set options on
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interface-by-interface basis. Mask is specified in shell-like patters, thus <cf>interface
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"*" { mode broadcast; };</cf> will start given protocol on all interfaces, with <cf>mode
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broadcast;</cf> option.
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</descrip>
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<sect>Filters
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<sect1>Introduction
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<p>Bird contains rather simple programming language. (No, it can not yet read mail :-). There are
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two objects in this language: filters and functions. Filters are called by bird core when route is
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<p>BIRD contains rather simple programming language. (No, it can not yet read mail :-). There are
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two objects in this language: filters and functions. Filters are called by BIRD core when route is
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being passed between protocol and main routing table, and filters may call functions. Functions may
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call other functions, but recursion is not allowed. Filter language contains control structures such
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as if's and switches, but it allows no loops. Filters are
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@ -205,6 +213,10 @@ pairs <cf><M>type name</M>;</cf>, where each pair defines one local variable. Bo
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several statements into one by <cf>{ <M>statements</M> }</cf> construction, that is useful if
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you want to make bigger block of code conditional.
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<p>There are two special filters, <cf/all/ (which accepts all routes) and <cf/none/ (which rejects
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all routes).
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<p>Bird supports functions, so that you don't have to repeat same blocks of code over and
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over. Functions can have zero or more parameters, and can have local variables. Function basically
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looks like this:
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@ -252,7 +264,7 @@ booleans (that is to prevent you from shooting in the foot).
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such variables, but you can not concatenate two strings (for example). String constants
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are written as <cf/"This is a string constant"/.
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<tag/ip/ this type can hold single ip address. Depending on version of bird you are using, it
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<tag/ip/ this type can hold single ip address. Depending on version of BIRD you are using, it
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can be IPv4 or IPv6 address. IPv4 addresses are written (as you would expect) as
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<cf/1.2.3.4/. You can apply special operator <cf>.mask(<M>num</M>)</cf>
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on values of type ip. It masks out all but first <cf><M>num</M></cf> bits from ip
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@ -275,7 +287,7 @@ booleans (that is to prevent you from shooting in the foot).
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3.0.0.0/8- is shorthand for 3.0.0.0/{0,7}.
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<tag/enum/
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enumeration types are halfway-internal in the bird. You can not define your own
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enumeration types are halfway-internal in the BIRD. You can not define your own
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variable of enumeration type, but some predefined variables are of enumeration
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type. Enumeration types are incompatible with each other, again, for your
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protection.
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@ -406,12 +418,12 @@ periodic messages onto this interface and <cf>nolisten</cf> means that rip will
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interface but not listen on it.
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<p>Following options generally override specified behavior from rfc. If you use any of these
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options, bird will no longer be rfc-compatible, which means it will not be able to talk to anything
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other than equally misconfigured bird. I warned you.
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options, BIRD will no longer be rfc-compatible, which means it will not be able to talk to anything
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other than equally misconfigured BIRD. I warned you.
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<descrip>
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<tag>port <M>number</M></tag>
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selects IP port to operate on, default 520. (This is useful when testing bird, if you
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selects IP port to operate on, default 520. (This is useful when testing BIRD, if you
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set this to address >1024, you will not need to run bird with UID==0).
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<tag>infinity <M>number</M></tag>
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@ -438,8 +450,8 @@ protocol rip MyRIP_test {
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port 1520;
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period 7;
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garbagetime 60;
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interface "*";
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honour neighbour;
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interface "eth0" { metric 3; mode multicast; } "eth1" { metric 2; mode broadcast; };
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honor neighbour;
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passwords { password "ahoj" from 0 to 10;
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password "nazdar" from 10;
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}
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