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Re: Trouble with Remote Apple Events (eppc) and Keychain
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Re: Trouble with Remote Apple Events (eppc) and Keychain


  • Subject: Re: Trouble with Remote Apple Events (eppc) and Keychain
  • From: has <email@hidden>
  • Date: Tue, 9 Oct 2007 14:38:10 +0100

Maximilian Schirmer wrote:

2 (out of 2) Intel machines (MacBooks, 10.4.10) corrupted the protocol
identifier and crashed everytime the code was executed. No difference
in connecting to PPC, Intel or themselves either.

The reversed protcol issue ('eppc' -> 'cppe') does suggest an endianess bug (a common cause is carelessly assuming big endianess while converting an OSType to string; CFSwapInt32HostToBig exists for a reason). Whether or not it's related to the crashing problem I don't know - it's been around a while (most likely since Tiger-i386 was released) and I can't recall experiencing any crashes in the past. However, testing remote AEs now OMM (Core Solo Mini, OS 10.4.10) results in a crash whenever the Apple Event Manager tries to auto-authenticate:


Exception:  EXC_BAD_ACCESS (0x0001)
Codes:      KERN_PROTECTION_FAILURE (0x0002) at 0x00000000

Thread 0 Crashed:
0 com.apple.CoreFoundation 0x9080e04a CFRelease + 56
1 com.apple.AE 0x9153c2c8 EPPCForwardRunLoopSource::doProcessSessionRequestResult() + 622
2 com.apple.CoreFoundation 0x9082cf92 CFRunLoopRunSpecific + 1213
3 com.apple.CoreFoundation 0x9082cace CFRunLoopRunInMode + 61
4 com.apple.AE 0x91521155 AESendMessage + 2207



I recommend filing a bug report with Apple (noting that not all users seem to be affected) and hope they identify the cause and get some fixes in pronto. In the meantime, the only workaround I can suggest is to avoid the AEM auto-authenticating by adding the remote host's username and password to the eppc URL yourself. The Keychain API docs are at: <http://developer.apple.com/documentation/Security/Reference/ keychainservices/index.html>; I believe there are third-party ObjC- based wrappers around as well but don't know anything about them.


HTH

has

p.s. Somewhat OT, but since you mentioned you're working in ObjC/ Cocoa you might like to take a look at objc-appscript <http:// appscript.sourceforge.net/objc-appscript.html> as a much more elegant native alternative to all that ugly mucking about with NSAppleScripts.

--
http://appscript.sourceforge.net
http://rb-appscript.rubyforge.org

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