We have a list of bots running on top of libpurple and recently, some of the msn bots were failing. I've digged into the issue and found the following: In msn_oim_report_to_user function inside the libpurple/protocols/msn/oim.c file, line 603, the function does not check if the message body is null or not.
I don't know how a null msg comes but upon receiving that msg line 656 gets a segmentation fault: decode_msg = (char *)purple_base64_decode(message->body, &body_len); here is the debug log before the crash: (17:42:50) soap: POST //rsi/rsi.asmx HTTP/1.1 SOAPAction: http://www.hotmail.msn.com/ws/2004/09/oim/rsi/GetMessage Content-Type:text/xml; charset=utf-8 User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1) Accept: */* Host: rsi.hotmail.com Content-Length: 892 Connection: Keep-Alive Cache-Control: no-cache <soap:Envelope xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:soap='http://schemas.xmlsoap.org/soap/envelope/' xmlns:xsd=' http://www.w3.org/2001/XMLSchema'><soap:Header><PassportCookie xmlns=' http://www.hotmail.msn.com/ws/2004/09/oim/rsi'><t>9fdlzAgGeHTactqFjdsB2vFN31LL3AbOuVzegbpg4ZoNQIAQr2Zxwf5sbmujGy5llxlBaM5bgAEIuc2ECrvKJOnkFiA6UiRo2SWJ5bRyi9o1UZMqh8XEhyAo7z6PBKwakfHlTnTsivf53XBn3gJoLWbA$$</t><p>9fDU!wGuSD0udoM7M28lmfRT!EmC0Ql5U6TUhLFI5DLVqz1qpxIdNvRd*4jLHb!Ptq3qF7qIR0!qBXo0mnVc2b6oofyqi7qeI3HvoGAU1YyA5NSCwU39wagAHwC4N*xqxV9B9zZBTP!qSiP8I7DI8d60!895W6md7BlTLcVUIk*yoXrsw4adHiEEUrvukgyQkCpTSw!5KsttTawAecKS*Frnm0Ei9LzwhJ</p></PassportCookie></soap:Header><soap:Body><GetMessage xmlns='http://www.hotmail.msn.com/ws/2004/09/oim/rsi '><messageId>3FF790AE-B865-4EBF-B599-452536F1C683</messageId><alsoMarkAsRead>false</alsoMarkAsRead></GetMessage></soap:Body></soap:Envelope> (17:42:50) msn: S: SB 001: USR 1 OK *[email protected]* *username* (17:42:50) msn: C: SB 001: CAL 2 *[email protected]* (17:42:51) msn: S: SB 001: CAL 2 RINGING 1523626997 (17:42:51) soap: read 1425 bytes (17:42:51) soap: current HTTP/1.1 200 OK Connection: close Date: Wed, 15 Sep 2010 00:42:51 GMT Server: Microsoft-IIS/6.0 P3P:CP="BUS CUR CONo FIN IVDo ONL OUR PHY SAMo TELo" xxn:10 X-Powered-By: ASP.NET X-AspNet-Version: 1.1.4322 Cache-Control: private, max-age=0 Content-Type: text/xml; charset=utf-8 Content-Length: 1114 <?xml version="1.0" encoding="utf-8"?><soap:Envelope xmlns:soap=" http://schemas.xmlsoap.org/soap/envelope/"; xmlns:xsi=" http://www.w3.org/2001/XMLSchema-instance"; xmlns:xsd=" http://www.w3.org/2001/XMLSchema";><soap:Body><GetMessageResponse xmlns=" http://www.hotmail.msn.com/ws/2004/09/oim/rsi";><GetMessageResult>X-Originating-IP: [88.234.212.152] X-Originating-Email: [] X-Message-Routing: eZqPogY4VCfJMli9auZVI8wsf+FU0RYdmyjHW9qle80kOvlj/TCwrNJcuiCpAjVnJcYTE From: =?utf-8?B?QWltZWU=?= <[email protected]<lt%[email protected]> > To: <[email protected] <lt%[email protected]>> Subject: X-OIM-originatingSource: 88.234.212.152 X-DS-server: BLU144-DS8 X-OIMProxy: MSNMSGR Message-ID: <[email protected]> X-OriginalArrivalTime: 31 Aug 2010 22:51:42.9501 (UTC) FILETIME=[14C70E0C:01CB495F] Date: 31 Aug 2010 15:51:42 -0700 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-OIM-Message-Type: OfflineMessage X-OIM-Run-Id: {cff6d859-e421-4925-898b-439cef872303} X-OIM-Sequence-Num: 22 </GetMessageResult></GetMessageResponse></soap:Body></soap:Envelope> (17:42:51) soap: ignoring malformed line: P3P:CP="BUS CUR CONo FIN IVDo ONL OUR PHY SAMo TELo" (17:42:51) soap: ignoring malformed line: xxn:10 (17:42:51) msn: oim body:{(null)} dns[457]: Oops, father has gone, wait for me, wait...! Segmentation fault yigit
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