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From: Mike Hearn <mike@plan99.net>
To: Paul Lyon <pmlyon@hotmail.ca>
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	<bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] Missing fRelayTxes in version message
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If you want to criticise the Bitcoin protocol for sloppyness, the variable
length of some messages isn't where I'd start.

Note that ping has the same issue, its length has changed over time to
include the nonce.

If your parser can't handle that kind of thing, you need to fix it. The
protocol has always worked that way.



On Wed, Jun 19, 2013 at 3:03 PM, Paul Lyon <pmlyon@hotmail.ca> wrote:

> I=E2=80=99m also running into this exact same issue with my parser, now I
> understand why the relay field behavior I was seeing doesn=E2=80=99t matc=
h the wiki.
>
> So to parse a version message, you can=E2=80=99t rely on the protocol ver=
sion? You
> have to know how long the payload is, and then parse the message
> accordingly? I agree with Turkey Breast, this seems a bit sloppy to me.
>
> Paul
>
> P.S. I=E2=80=99ve never used a dev mailing list before and I want to get =
involved
> with the Bitcoin dev community, so let me know if I=E2=80=99m horribly vi=
olating
> any mailing list etiquette. =F0=9F=98=8A
>
> *From:* Mike Hearn
> *Sent:* =E2=80=8EWednesday=E2=80=8E, =E2=80=8EJune=E2=80=8E =E2=80=8E19=
=E2=80=8E, =E2=80=8E2013 =E2=80=8E7=E2=80=8E:=E2=80=8E43=E2=80=8E =E2=80=8E=
AM
> *To:* Turkey Breast
> *Cc:* bitcoin-development@lists.sourceforge.net
>
> Bitcoin-Qt on master does send it now although it doesn't affect anything=
,
> but as old pre-filtering versions will continue to exist, you'll always
> have to be able to deserialize version messages without it.
>
> Bitcoin version messages have always had variable length, look at how the
> code is written in main.cpp. If you didn't experience issues until now al=
l
> it means is that no sufficiently old nodes were talking to yours.
>
> The standard does not say it should appear. Read it again - BIP 37 says
> about the new version message field:
> If false then broadcast transactions will not be announced until a
> filter{load,add,clear} command is received. *If missing or true*, no
> change in protocol behaviour occurs.
>
>
> On Wed, Jun 19, 2013 at 12:33 PM, Turkey Breast <turkeybreast@yahoo.com>w=
rote:
>
>> It's a problem if you work with iterators to deserialize the byte stream=
.
>> Even failing that, it's just sloppy programming. What happens in the fut=
ure
>> when new fields are added to the version message? It's not a big deal to
>> say that this protocol version has X number of fields, that (higher)
>> protocol version message has X + N number of fields. Deterministic numbe=
r
>> of fields per protocol version is sensical and how Bitcoin has been for =
a
>> long time.
>>
>> And yes, it was a problem for me that caused a lot of confusion why this
>> byte didn't exist in many version messages despite the standard saying i=
t
>> should and the code in bitcoind indicating it should. Nowhere was this
>> written. It doesn't help other implementations to have an unclear behavi=
our
>> that depends on some magic from one implementation.
>>
>>   ------------------------------
>>  *From:* Mike Hearn <mike@plan99.net>
>> *To:* Turkey Breast <turkeybreast@yahoo.com>
>> *Cc:* "bitcoin-development@lists.sourceforge.net" <
>> bitcoin-development@lists.sourceforge.net>
>> *Sent:* Wednesday, June 19, 2013 11:39 AM
>>
>> *Subject:* Re: [Bitcoin-development] Missing fRelayTxes in version
>> message
>>
>> It has to be optional because old clients don't send it, obviously.
>>
>> Why is this even an issue? There's no problem with variable length
>> messages in any codebase that I'm aware of. Is this solving some actual
>> problem?
>>
>>
>> On Wed, Jun 19, 2013 at 12:30 AM, Turkey Breast <turkeybreast@yahoo.com>=
wrote:
>>
>> That's me. I never said to make all messages fixed length. I said to mak=
e
>> a fixed number of fields per protocol. So given a protocol version numbe=
r,
>> you know the number of fields in a message. This is not only easier for
>> parsing messages, but just good practice. I don't see why a 1 byte flag
>> needs to be optional anyway.
>>
>>   ------------------------------
>>  *From:* Mike Hearn <mike@plan99.net>
>> *To:* Turkey Breast <turkeybreast@yahoo.com>
>> *Cc:* Bitcoin Dev <bitcoin-development@lists.sourceforge.net>
>> *Sent:* Tuesday, June 18, 2013 9:48 PM
>> *Subject:* Re: [Bitcoin-development] Missing fRelayTxes in version
>> message
>>
>> It's not a bug (although there was recently a change to make bitcoind/qt
>> always send this field anyway).
>>
>> I don't know where Amir is going with BIP 60. Version messages have
>> always been variable length. There's nothing inherent in the Bitcoin
>> protocol that says all messages are fixed length, indeed, tx messages ar=
e
>> allowed to have arbitrary data appended after them that gets relayed.
>>
>>
>> On Tue, Jun 18, 2013 at 7:45 PM, Turkey Breast <turkeybreast@yahoo.com>w=
rote:
>>
>> See this BIP. I'm not sure if this is a bug or what, but it would be goo=
d
>> if messages always had a fixed number of fields per protocol version.
>>
>> https://en.bitcoin.it/wiki/BIP_0060#Code_Updates
>>
>> This BIP details everything that needs to be done and proposes a protoco=
l
>> upgrade.
>>
>>
>> ------------------------------------------------------------------------=
------
>> This SF.net <http://sf.net/> email is sponsored by Windows:
>>
>> Build for Windows Store.
>>
>> http://p.sf.net/sfu/windows-dev2dev
>> _______________________________________________
>> Bitcoin-development mailing list
>> Bitcoin-development@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/bitcoin-development
>>
>>
>>
>>
>>
>>
>> ------------------------------------------------------------------------=
------
>> This SF.net email is sponsored by Windows:
>>
>> Build for Windows Store.
>>
>> http://p.sf.net/sfu/windows-dev2dev
>> _______________________________________________
>> Bitcoin-development mailing list
>> Bitcoin-development@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/bitcoin-development
>>
>>
>>
>>
>>
>>
>> ------------------------------------------------------------------------=
------
>> This SF.net email is sponsored by Windows:
>>
>> Build for Windows Store.
>>
>> http://p.sf.net/sfu/windows-dev2dev
>> _______________________________________________
>> Bitcoin-development mailing list
>> Bitcoin-development@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/bitcoin-development
>>
>>
>

--089e013c7042742a4204df81b023
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Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">If you want to criticise the Bitcoin protocol for sloppyne=
ss, the variable length of some messages isn&#39;t where I&#39;d start.<div=
><br></div><div>Note that ping has the same issue, its length has changed o=
ver time to include the nonce.</div>
<div><br></div><div style>If your parser can&#39;t handle that kind of thin=
g, you need to fix it. The protocol has always worked that way.</div><div s=
tyle><br></div></div><div class=3D"gmail_extra"><br><br><div class=3D"gmail=
_quote">
On Wed, Jun 19, 2013 at 3:03 PM, Paul Lyon <span dir=3D"ltr">&lt;<a href=3D=
"mailto:pmlyon@hotmail.ca" target=3D"_blank">pmlyon@hotmail.ca</a>&gt;</spa=
n> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;b=
order-left:1px #ccc solid;padding-left:1ex">
<div><div dir=3D"ltr" style=3D"font-family:Calibri,&#39;Segoe UI&#39;,Meiry=
o,&#39;Microsoft YaHei UI&#39;,&#39;Microsoft JhengHei UI&#39;,&#39;Malgun =
Gothic&#39;,&#39;Khmer UI&#39;,&#39;Nirmala UI&#39;,Tunga,&#39;Lao UI&#39;,=
Ebrima,sans-serif;font-size:12pt">
<div>I=E2=80=99m also running into this exact same issue with my parser, no=
w I understand why the relay field behavior I was seeing=C2=A0doesn=E2=80=
=99t match the wiki.</div><div>=C2=A0</div><div>So to parse a version messa=
ge, you can=E2=80=99t rely on the protocol version? You have to know how lo=
ng the payload is, and then parse the message accordingly? I agree with Tur=
key Breast, this seems a bit sloppy to me.</div>
<div>=C2=A0</div><div>Paul</div><div>=C2=A0</div><div>P.S. I=E2=80=99ve nev=
er used a dev mailing list before and I want to get involved with the Bitco=
in dev community, so let me know if I=E2=80=99m horribly violating any=C2=
=A0mailing list etiquette. <span style=3D"font-family:&quot;Segoe UI Symbol=
&quot;,&quot;Apple Color Emoji&quot;">=F0=9F=98=8A</span></div>
<div>=C2=A0</div><div style=3D"padding-top:5px;border-top-color:rgb(229,229=
,229);border-top-width:1px;border-top-style:solid"><div><font face=3D"Calib=
ri, &#39;Segoe UI&#39;, Meiryo, &#39;Microsoft YaHei UI&#39;, &#39;Microsof=
t JhengHei UI&#39;, &#39;Malgun Gothic&#39;, &#39;Khmer UI&#39;, &#39;Nirma=
la UI&#39;, Tunga, &#39;Lao UI&#39;, Ebrima, sans-serif" style=3D"line-heig=
ht:15pt;letter-spacing:0.02em;font-family:Calibri,&quot;Segoe UI&quot;,Meir=
yo,&quot;Microsoft YaHei UI&quot;,&quot;Microsoft JhengHei UI&quot;,&quot;M=
algun Gothic&quot;,&quot;Khmer UI&quot;,&quot;Nirmala UI&quot;,Tunga,&quot;=
Lao UI&quot;,Ebrima,sans-serif;font-size:11pt"><b>From:</b>=C2=A0Mike Hearn=
<br>
<b>Sent:</b>=C2=A0=E2=80=8EWednesday=E2=80=8E, =E2=80=8EJune=E2=80=8E =E2=
=80=8E19=E2=80=8E, =E2=80=8E2013 =E2=80=8E7=E2=80=8E:=E2=80=8E43=E2=80=8E =
=E2=80=8EAM<br><b>To:</b>=C2=A0Turkey Breast<br><b>Cc:</b>=C2=A0<a href=3D"=
mailto:bitcoin-development@lists.sourceforge.net" target=3D"_blank">bitcoin=
-development@lists.sourceforge.net</a></font></div>
</div><div><div class=3D"h5"><div>=C2=A0</div><div dir=3D"ltr">Bitcoin-Qt o=
n master does send it now although it doesn&#39;t affect anything, but as o=
ld pre-filtering versions will continue to exist, you&#39;ll always have to=
 be able to deserialize version messages without it.<div>

<br></div><div>Bitcoin version messages have always had variable length, lo=
ok at how the code is written in main.cpp. If you didn&#39;t experience iss=
ues until now all it means is that no sufficiently old nodes were talking t=
o yours.</div>

<div><br></div><div>The standard does not say it should appear. Read it aga=
in - BIP 37 says about the new version message field:</div><div><table styl=
e=3D"line-height:19.2px;border-collapse:collapse;font-size:12.8px;backgroun=
d-color:rgb(249,249,249);font-family:sans-serif;margin:1em 0px;border:1px s=
olid rgb(170,170,170)">

<tbody><tr><td style=3D"padding:0.2em;border:1px solid rgb(170,170,170)">If=
 false then broadcast transactions will not be announced until a filter{loa=
d,add,clear} command is received. <b>If missing or true</b>, no change in p=
rotocol behaviour occurs.<br>

</td></tr></tbody></table></div></div><div class=3D"gmail_extra"><br><br><d=
iv class=3D"gmail_quote">On Wed, Jun 19, 2013 at 12:33 PM, Turkey Breast <s=
pan dir=3D"ltr">&lt;<a title=3D"mailto:turkeybreast@yahoo.com" href=3D"mail=
to:turkeybreast@yahoo.com" target=3D"_blank">turkeybreast@yahoo.com</a>&gt;=
</span> wrote:<br>

<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;padding=
-left:1ex;border-left-color:rgb(204,204,204);border-left-width:1px;border-l=
eft-style:solid"><div><div style=3D"font-family:times new roman,new york,ti=
mes,serif;font-size:12pt">
<div><span>It&#39;s a problem if you work with iterators to deserialize the=
 byte stream. Even failing that, it&#39;s just sloppy programming. What hap=
pens in the future when new fields are added to the version message? It&#39=
;s not a big deal to say that this protocol version has X number of fields,=
 that (higher) protocol version message has X + N number of fields. Determi=
nistic number of fields per protocol version is sensical and how Bitcoin ha=
s been for a long time.</span></div>

<div style=3D"font-family:times new roman,new york,times,serif;font-size:16=
px;font-style:normal;background-color:transparent"><br><span></span></div><=
div style=3D"font-family:times new roman,new york,times,serif;font-size:16p=
x;font-style:normal;background-color:transparent">

<span>And yes, it was a problem for me
 that caused a lot of confusion why this byte didn&#39;t exist in many vers=
ion messages despite the standard saying it should and the code in bitcoind=
 indicating it should. Nowhere was this written. It doesn&#39;t help other =
implementations to have an unclear behaviour that depends on some magic fro=
m one implementation.<br>

</span></div><div><br></div>  <div style=3D"font-family:times new roman,new=
 york,times,serif;font-size:12pt"> <div style=3D"font-family:times new roma=
n,new york,times,serif;font-size:12pt"> <div dir=3D"ltr"> <hr size=3D"1">  =
<font face=3D"Arial"><div>

 <b><span style=3D"font-weight:bold">From:</span></b> Mike Hearn &lt;<a tit=
le=3D"mailto:mike@plan99.net" href=3D"mailto:mike@plan99.net" target=3D"_bl=
ank">mike@plan99.net</a>&gt;<br> <b><span style=3D"font-weight:bold">To:</s=
pan></b> Turkey Breast &lt;<a title=3D"mailto:turkeybreast@yahoo.com" href=
=3D"mailto:turkeybreast@yahoo.com" target=3D"_blank">turkeybreast@yahoo.com=
</a>&gt; <br>

</div><b><span style=3D"font-weight:bold">Cc:</span></b> &quot;<a title=3D"=
mailto:bitcoin-development@lists.sourceforge.net" href=3D"mailto:bitcoin-de=
velopment@lists.sourceforge.net" target=3D"_blank">bitcoin-development@list=
s.sourceforge.net</a>&quot; &lt;<a title=3D"mailto:bitcoin-development@list=
s.sourceforge.net" href=3D"mailto:bitcoin-development@lists.sourceforge.net=
" target=3D"_blank">bitcoin-development@lists.sourceforge.net</a>&gt; <br>

 <b><span style=3D"font-weight:bold">Sent:</span></b> Wednesday, June 19, 2=
013 11:39 AM<div><div><br> <b><span style=3D"font-weight:bold">Subject:</sp=
an></b> Re: [Bitcoin-development] Missing fRelayTxes in version message<br>

 </div></div></font> </div><div><div> <div><br>
<div><div dir=3D"ltr">It has to be optional because old clients don&#39;t s=
end it, obviously.<div><br></div><div>Why is this even an issue? There&#39;=
s no problem with variable length messages in any codebase that I&#39;m awa=
re of. Is this solving some actual problem?</div>


</div><div><br><br><div>On Wed, Jun 19, 2013 at 12:30 AM, Turkey Breast <sp=
an dir=3D"ltr">&lt;<a title=3D"mailto:turkeybreast@yahoo.com" href=3D"mailt=
o:turkeybreast@yahoo.com" rel=3D"nofollow" target=3D"_blank">turkeybreast@y=
ahoo.com</a>&gt;</span> wrote:<br>

<blockquote style=3D"margin:0px 0px 0px 0.8ex;padding-left:1ex;border-left-=
color:rgb(204,204,204);border-left-width:1px;border-left-style:solid"><div>=
<div style=3D"font-family:times new roman,new york,times,serif;font-size:12=
pt">
<div><span>That&#39;s me. I never said to make all messages fixed length. I=
 said to make a fixed number of fields per protocol. So given a protocol ve=
rsion number, you know the number of fields in a message. This is not only =
easier for parsing messages, but just good practice. I don&#39;t see why a =
1 byte flag needs to be optional anyway.<br>


</span></div><div><div><br></div>  </div><div style=3D"font-family:times ne=
w roman,new york,times,serif;font-size:12pt"><div> </div><div style=3D"font=
-family:times new roman,new york,times,serif;font-size:12pt">
<div> <div dir=3D"ltr"> <hr size=3D"1">  <font face=3D"Arial"> <b><span sty=
le=3D"font-weight:bold">From:</span></b> Mike Hearn &lt;<a title=3D"mailto:=
mike@plan99.net" href=3D"mailto:mike@plan99.net" rel=3D"nofollow" target=3D=
"_blank">mike@plan99.net</a>&gt;<br>
 <b><span style=3D"font-weight:bold">To:</span></b> Turkey Breast &lt;<a ti=
tle=3D"mailto:turkeybreast@yahoo.com" href=3D"mailto:turkeybreast@yahoo.com=
" rel=3D"nofollow" target=3D"_blank">turkeybreast@yahoo.com</a>&gt; <br>

<b><span style=3D"font-weight:bold">Cc:</span></b>
 Bitcoin Dev &lt;<a title=3D"mailto:bitcoin-development@lists.sourceforge.n=
et" href=3D"mailto:bitcoin-development@lists.sourceforge.net" rel=3D"nofoll=
ow" target=3D"_blank">bitcoin-development@lists.sourceforge.net</a>&gt; <br=
> <b><span style=3D"font-weight:bold">Sent:</span></b> Tuesday, June 18, 20=
13 9:48 PM<br>


 <b><span style=3D"font-weight:bold">Subject:</span></b> Re: [Bitcoin-devel=
opment] Missing fRelayTxes in version message<br> </font> </div></div><div>=
<div> <div><br>
<div><div dir=3D"ltr">It&#39;s not a bug (although there was recently a cha=
nge to make bitcoind/qt always send this field anyway).=C2=A0<div><br></div=
><div>I don&#39;t know where Amir is going with BIP 60. Version messages ha=
ve always been variable length. There&#39;s nothing inherent in the Bitcoin=
 protocol that says all messages are fixed length, indeed, tx messages are =
allowed to have arbitrary data appended after them that gets relayed.</div>



</div><div><br><br><div>On Tue, Jun 18, 2013 at 7:45 PM, Turkey Breast <spa=
n dir=3D"ltr">&lt;<a title=3D"mailto:turkeybreast@yahoo.com" href=3D"mailto=
:turkeybreast@yahoo.com" rel=3D"nofollow" target=3D"_blank">turkeybreast@ya=
hoo.com</a>&gt;</span> wrote:<br>

<blockquote style=3D"margin:0px 0px 0px 0.8ex;padding-left:1ex;border-left-=
color:rgb(204,204,204);border-left-width:1px;border-left-style:solid"><div>=
<div style=3D"font-family:times new roman,new york,times,serif;font-size:12=
pt">
<div>See this BIP. I&#39;m not sure if this is a bug or what, but it would =
be good if messages always had a fixed number of fields per protocol versio=
n.</div>


<div><br></div><div style=3D"font-family:times new roman,new york,times,ser=
if;font-size:16px;font-style:normal;background-color:transparent"><a title=
=3D"https://en.bitcoin.it/wiki/BIP_0060#Code_Updates" href=3D"https://en.bi=
tcoin.it/wiki/BIP_0060#Code_Updates" rel=3D"nofollow" target=3D"_blank">htt=
ps://en.bitcoin.it/wiki/BIP_0060#Code_Updates</a></div>



<div style=3D"font-family:times new roman,new york,times,serif;font-size:16=
px;font-style:normal;background-color:transparent"><br></div><div style=3D"=
font-family:times new roman,new york,times,serif;font-size:16px;font-style:=
normal;background-color:transparent">



This BIP details everything that needs to be done and proposes a protocol u=
pgrade.<br></div></div></div><br>------------------------------------------=
------------------------------------<br>
This <a title=3D"http://sf.net/" href=3D"http://sf.net/" rel=3D"nofollow" t=
arget=3D"_blank">SF.net</a> email is sponsored by Windows:<br>
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Build for Windows Store.<br>
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