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Language libraries for the BOB API

Diferenças técnicas para o SAM (para melhor?)

BOB has separate command and data channels. One, an application command channel socket to router to configure. Two, the application data sockets to/from router that carry only data. The command channel is only needed for making or setting the initial destination key, and to set the destination key to port bindings. All connections run in parallel.

SAM has one connection that does everything, and you need to parse every packet.

BOB does not hold keypair values, nor does the router. Your application holds the keypair values. This is to reduce any extra complexity in the router code, it also adds to your privacy.

SAM router stores every keypair you ever make.

Tais diferenças são importantes.

Visão geral

KEYS = par de chaves pública+privada, que são BASE64

KEY = chave pública, também BASE64

ERROR as is implied returns the message "ERROR "+DESCRIPTION+"\n", where the DESCRIPTION is what went wrong.

OK returns "OK", and if data is to be returned, it is on the same line. OK means the command is finished.

DATA lines contain information that you requested. There may be multiple DATA lines per request.

NOTE: The help command is the ONLY command that has an exception to the rules... it can actually return nothing! This is intentional, since help is a HUMAN and not an APPLICATION command.

Connection and Version

All BOB status output is by lines. Lines may be \n or \r\n terminated, depending on the system. On connection, BOB outputs two lines:

BOB version

The current version is: 00.00.10

Note that previous versions used upper-case hex digits and did not conform to I2P versioning standards. It is recommended that subsequent versions use digits 0-9 only. 00.00.10

Version history

Version I2P Router Version Changes
00.00.10 0.9.8 current version
00.00.00 - 00.00.0F   development versions


PLEASE NOTE: For CURRENT details on the commands PLEASE use the built-in help command. Just telnet to localhost 2827 and type help and you can get full documentation on each command.

Commands never get obsoleted or changed, however new commands do get added from time to time.

COMANDO     OPERANDO                             Retorno
help        (optional command to get help on)   NOTHING or OK and description of the command
clear                                           ERROR or OK
getdest                                         ERROR or OK and KEY
getkeys                                         ERROR or OK and KEYS
getnick     tunnelname                          ERROR or OK
inhost      hostname or IP address              ERROR or OK
inport      port number                         ERROR or OK
list                                            ERROR or DATA lines and final OK
lookup      hostname                            ERROR or OK and KEY
newkeys                                         ERROR or OK and KEY
option      key1=value1 key2=value2...          ERROR or OK
outhost     hostname or IP address              ERROR or OK
outport     port number                         ERROR or OK
quiet                                           ERROR or OK
quit                                            OK and terminates the command connection
setkeys     KEYS                                ERROR or OK and KEY
setnick     tunnel nickname                     ERROR or OK
show                                            ERROR or OK and information
showprops                                       ERROR or OK and information
start                                           ERROR or OK
status      tunnel nickname                     ERROR or OK and information
stop                                            ERROR or OK
verify      KEY                                 ERROR or OK
visit                                           OK, and dumps BOB's threads to the wrapper.log
zap                                             nothing, quits BOB

Once set up, all TCP sockets can and will block as needed, and there is no need for any additional messages to/from the command channel. This allows the router to pace the stream without exploding with OOM like SAM does as it chokes on attempting to shove many streams in or out one socket -- that can't scale when you have alot of connections!

What is also nice about this particular interface is that writing anything to interface to it, is much much easier than SAM. There is no other processing to do after the set up. It's configuration is so simple, that very simple tools, such as nc (netcat) can be used to point to some application. The value there is that one could schedule up and down times for an application, and not have to change the application to do that, or to even have to stop that application. Instead, you can literally "unplug" the destination, and "plug it in" again. As long as the same IP/port addresses and destination keys are used when bringing the bridge up, the normal TCP application won't care, and won't notice. It will simply be fooled -- the destinations are not reachable, and that nothing is coming in.


For the following example, we'll setup a very simple local loopback connection, with two destinations. Destination "mouth" will be the CHARGEN service from the INET superserver daemon. Destination "ear" will be a local port that you can telnet into, and watch the pretty ASCII test puke forth.

EXAMPLE SESSION DIALOGUE -- simple telnet 2827 works
A = Aplicação
C = BOB's Command response.

C	A	BOB 00.00.10
A	C	setnick mouth
C	A	OK Nickname set to mouth
A	C	newkeys
C	A	OK ZMPz1zinTdy3~zGD~f3g9aikZTipujEvvXOEyYfq4Su-mNKerqG710hFbkR6P-xkouVyNQsqWLI8c6ngnkSwGdUfM7hGccqBYDjIubTrlr~0g2-l0vM7Y8nSqtFrSdMw~pyufXZ0Ys3NqUSb8NuZXpiH2lCCkFG21QPRVfKBGwvvyDVU~hPVfBHuR8vkd5x0teMXGGmiTzdB96DuNRWayM0y8vkP-1KJiPFxKjOXULjuXhLmINIOYn39bQprq~dAtNALoBgd-waZedYgFLvwHDCc9Gui8Cpp41EihlYGNW0cu0vhNFUN79N4DEpO7AtJyrSu5ZjFTAGjLw~lOvhyO2NwQ4RiC4UCKSuM70Fz0BFKTJquIjUNkQ8pBPBYvJRRlRG9HjAcSqAMckC3pvKKlcTJJBAE8GqexV7rdCCIsnasJXle-6DoWrDkY1s1KNbEVH6i1iUEtmFr2IHTpPeFCyWfZ581CAFNRbbUs-MmnZu1tXAYF7I2-oXTH2hXoxCGAAAA


A       C     outhost
C       A     OK outhost set
A       C     outport 19
C       A     OK outbound port set
A       C     start
C       A     OK tunnel starting

At this point, there was no error, a destination with a nickname of "mouth" is set up. When you contact the destination provided, you actually connect to the CHARGEN service on 19/TCP.

Now for the other half, so that we can actually contact this destination.

C       A       BOB 00.00.10
C       A       OK
A       C       setnick ear
C       A       OK Nickname set to ear
A       C       newkeys
C       A       OK 8SlWuZ6QNKHPZ8KLUlExLwtglhizZ7TG19T7VwN25AbLPsoxW0fgLY8drcH0r8Klg~3eXtL-7S-qU-wdP-6VF~ulWCWtDMn5UaPDCZytdGPni9pK9l1Oudqd2lGhLA4DeQ0QRKU9Z1ESqejAIFZ9rjKdij8UQ4amuLEyoI0GYs2J~flAvF4wrbF-LfVpMdg~tjtns6fA~EAAM1C4AFGId9RTGot6wwmbVmKKFUbbSmqdHgE6x8-xtqjeU80osyzeN7Jr7S7XO1bivxEDnhIjvMvR9sVNC81f1CsVGzW8AVNX5msEudLEggpbcjynoi-968tDLdvb-CtablzwkWBOhSwhHIXbbDEm0Zlw17qKZw4rzpsJzQg5zbGmGoPgrSD80FyMdTCG0-f~dzoRCapAGDDTTnvjXuLrZ-vN-orT~HIVYoHV7An6t6whgiSXNqeEFq9j52G95MhYIfXQ79pO9mcJtV3sfea6aGkMzqmCP3aikwf4G3y0RVbcPcNMQetDAAAA
A       C       inhost
C       A       OK inhost set
A       C       inport 37337
C       A       OK inbound port set
A       C       start
C       A       OK tunnel starting
A       C       quit
C       A       OK Bye!

Now all we need to do is telnet into, port 37337, send the destination key or host address from addressbook we want to contact. In this case, we want to contact "mouth", all we do is paste in the key and it goes.

NOTE: The "quit" command in the command channel does NOT disconnect the tunnels like SAM.

$ telnet 37337
Connected to
Escape character is '^]'.

After a few virtual miles of this spew, press Control-]

cdefghijklmnopqrstuvwxyz{|}~ !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJK
defghijklmnopqrstuvwxyz{|}~ !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKL
efghijklmnopqrstuvwxyz{|}~ !"#$%&'()*+,-./0123456789:;<=
telnet> c
Connection closed.

Eis aqui o que acontece...

telnet -> ear -> i2p -> mouth -> chargen -.
telnet <- ear <- i2p <- mouth <-----------'

Você também pode se conectar a EEPSITES!

$ telnet 37337
Connected to
Escape character is '^]'.
GET / HTTP/1.1

HTTP/1.1 200 OK
Date: Fri, 05 Dec 2008 14:20:28 GMT
Connection: close
Content-Type: text/html
Content-Length: 3946
Last-Modified: Fri, 05 Dec 2008 10:33:36 GMT
Accept-Ranges: bytes

  <link rel="shortcut icon" href="favicon.ico">
<a href="http://sponge.i2p/">--Sponge.</a></pre>
<img src="/counter.gif" alt="!@^7A76Z!#(*&amp;%"> visitors. </body>
Connection closed by foreign host.

Pretty cool isn't it? Try some other well known EEPSITES if you like, nonexistent ones, etc, to get a feel for what kind of output to expect in different situations. For the most part, it is suggested that you ignore any of the error messages. They would be meaningless to the application, and are only presented for human debugging.

Let's put down our destinations now that we are all done with them.

First, lets see what destination nicknames we have.

A	C	list
C	A	DATA NICKNAME: mouth STARTING: false RUNNING: true STOPPING: false KEYS: true QUIET: false INPORT: not_set INHOST: localhost OUTPORT: 19 OUTHOST:
C	A	DATA NICKNAME: ear STARTING: false RUNNING: true STOPPING: false KEYS: true QUIET: false INPORT: 37337 INHOST: OUTPORT: not_set OUTHOST: localhost
C	A	OK Listing done

Alright, there they are. First, let's remove "mouth".

A	C	getnick mouth
C	A	OK Nickname set to mouth
A	C	stop
C	A	OK tunnel stopping
A	C	clear
C	A	OK cleared

Now to remove "ear", note that this is what happens when you type too fast, and shows you what typical ERROR messages looks like.

A	C	getnick ear
C	A	OK Nickname set to ear
A	C	stop
C	A	OK tunnel stopping
A	C	clear
C	A	ERROR tunnel is active
A	C	clear
C	A	OK cleared
A	C	quit
C	A	OK Bye!

I won't bother to show an example of the receiver end of a bridge because it is very simple. There are two possible settings for it, and it is toggled with the "quiet" command.

The default is NOT quiet, and the first data to come into your listening socket is the destination that is making the contact. It is a single line consisting of the BASE64 address followed by a newline. Everything after that is for the application to actually consume.

In quiet mode, think of it as a regular Internet connection. No extra data comes in at all. It's just as if you are plain connected to the regular Internet. This mode allows a form of transparency much like is available on the router console tunnel settings pages, so that you can use BOB to point a destination at a web server, for example, and you would not have to modify the web server at all.

The advantage with using BOB for this is as discussed previously. You could schedule random uptimes for the application, redirect to a different machine, etc. One use of this may be something like wanting to try to goof up router-to-destination upness guessing. You could stop and start the destination with a totally different process to make random up and down times on services. That way you would only be stopping the ability to contact such a service, and not have to bother shutting it down and restarting it. You could redirect and point to a different machine on your LAN while you do updates, or point to a set of backup machines depending on what is running, etc, etc. Only your imagination limits what you could do with BOB.