[asterisk-dev] [Code Review] Avoid infinite loop with certain local channel connected line updates

[Terry Wilson]

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This is an automatically generated e-mail. To reply, visit:
https://reviewboard.asterisk.org/r/932/
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(Updated 2010-09-20 17:56:40.408941)


Review request for Asterisk Developers, Russell Bryant and Mark Michelson.


Changes
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Address Russell's new comments.


Summary
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It is possible to create an infinite loop with connected line updates and local channels. One side of the local channel queues an update to the other side in local_indicate() which then causes the other side to do the same ad infinitum. This patch adds a function to compare the connected line update with the connected line info already on a channel. If there is no difference, it doesn't send the update frame.

It uses ast_connected_line_build_data since that function would need to be changed if any of the ast_connected_line-related structs changed and trying to compare each setting individually is really a pain and would be just another function to update.


Diffs (updated)
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  /branches/1.8/main/channel.c 287638 

Diff: https://reviewboard.asterisk.org/r/932/diff


Testing
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queues.conf
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[general]
persistentmembers = yes
autofill = yes
monitor-type = MixMonitor
shared_lastcall=no

[test]
strategy=ringall
member => Local/6001 at sip/nm
reportholdtime=yes

extensions.conf
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[sip]
exten => 123,1,NoOp
exten => 123,n,Answer
exten => 123,n,Queue(test)

exten => _XXXX,1,Set(CONNECTEDLINE(num,i)=5551212)
exten => _XXXX,n,Set(CONNECTEDLINE(name,i)=Widgets)
exten => _XXXX,n,Set(__CONNECTED_LINE_CALLEE_SEND_MACRO=CONNECTED_LINE_MANIPULATION)
exten => _XXXX,n,Set(__CONNECTED_LINE_CALLER_SEND_MACRO=CONNECTED_LINE_MANIPULATION)
exten => _XXXX,n,Dial(SIP/${EXTEN})

[macro-CONNECTED_LINE_MANIPULATION]
exten => s,1,NoOp(MACRO WAS CALLED)

sip.conf
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[test](!)
type=friend
host=dynamic
secret=whatever
canreinvite=no
context=sip
callgroup=1
pickupgroup=1


[6001](test)
[6002](test)

To reproduce
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6001 calls 100, puts on hold and dials *8 to pickup own call and transfers the the original call (in Eyebeam dials 100 on line 1, dials *8 on line two, hit XFER and click on line 1).

Before the patch, the macro is executed indefinitely. After, only once.


Thanks,

Terry