Hello,
I have now a reproducible problem and TCP trace of a cause of 'Broken
pipe' errors I reported a while ago. And it seems it is also related to
"Socket is active until what or when thread" started by Bruce a month ago.
Problem is as follows:
1. I'm waiting on aSocketAccessor readInto:startingAt:for: to receive
next data
2. above method is deblocked but returning zero data
3. if I repeat, it returns immediately, but again with 0 data
4. I need to close a connection and start again. This can cause a
socket close before all data is sent, hence a "broken pipes"
It seems that FIN packets cause above problem. FIN packets somehow
deblock a waiting method but they shouldn't. They should raise some
exception instead.
Here are two traces on Swazoo done with Ethereal, one with above
problem, another without.
1. See packet 10 with FIN, causing Swazoo to read an empty packet, then
respond with 400 bad request and close connection with a final packet:
No.Source Destination Info
1
76.8.192.250 213.157.239.24 TCP 33438> http [SYN] Seq=0 Ack=0
2
213.157.239.24 76.8.192.250 TCP http > 33438 [SYN,ACK] Seq=0 Ack=1
3
76.8.192.250 213.157.239.24 TCP 33438> http [ACK] Seq=1 Ack=1
4
76.8.192.250 213.157.239.24 HTTP GET /znamenitosti.html HTTP/1.0
5
213.157.239.24 76.8.192.250 TCP http > 33438 [ACK] Seq=1 Ack=541
6
213.157.239.24 76.8.192.250 HTTP HTTP/1.1 200 OK (text/html)
7
213.157.239.24 76.8.192.250 HTTP "Continuation or non-HTTP traffic
8
76.8.192.250 213.157.239.24 TCP 33438> http [ACK] Seq=541 Ack=1441
9
76.8.192.250 213.157.239.24 TCP 33438> http [ACK] Seq=541 Ack=2293
10
76.8.192.250 213.157.239.24 TCP 33438>http[FIN,ACK] Seq=541Ack=2293
11
213.157.239.24 76.8.192.250 HTTP HTTP/1.1 400 Bad Request
12
213.157.239.24 76.8.192.250 TCP http>33438[FIN,ACK] Seq=2714Ack=542
2. Swazoo session without problems:
No.Source Destination Info
1
212.18.33.254 213.157.239.24 TCP 1855 > http [SYN] Seq=0 Ack=0
2
213.157.239.24 212.18.33.254 TCP http > 1855 [SYN,ACK] Seq=0 Ack=1
3
212.18.33.254 213.157.239.24 TCP 1855 > http [ACK] Seq=1 Ack=1
4
212.18.33.254 213.157.239.24 HTTP GET /znamenitosti.html HTTP/1.1
5
213.157.239.24 212.18.33.254 TCP http > 1855 [ACK] Seq=1 Ack=532
6
213.157.239.24 212.18.33.254 HTTP HTTP/1.1 200 OK (text/html)
7
213.157.239.24 212.18.33.254 HTTP Continuation or non-HTTP traffic
8
212.18.33.254 213.157.239.24 TCP 1855 > http [SYN] Seq=0 Ack=0
9
213.157.239.24 212.18.33.254 TCP http > 1855 [SYN,ACK] Seq=0 Ack=1
10
212.18.33.254 213.157.239.24 TCP 1855 > http [ACK] Seq=1 Ack=1
11
212.18.33.254 213.157.239.24 HTTP GET /screen.css HTTP/1.1
...etc
I hope this will shed a light on that problem to help it solve as soon
as possible.
Janko
--
Janko Mivšek
AIDA/Web
Smalltalk Web Application Server
http://www.aidaweb.si
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