Port fixes from trunk (SASL fixes and mishandling of reply string buffer)

[mmh] / ChangeLog

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+2008-04-30  Peter Maydell  <pmaydell@chiark.greenend.org.uk>
+
+       * Fixes ported from trunk: 
+       
+       * mts/smtp/smtp.c: provide a callback for SASL_CB_AUTHNAME
+       (fixes issue with SASL sending the wrong username in some
+       circumstances). Thanks to <der_wachtmeister@freenet.de>
+       for the patch.
+
+       * Revert previous attempt at fix for SASL issue as it
+       is the wrong approach.
+
+       * Fix in correct manner, by making sm_rrecord() and thus
+       sm_hear() set the length of the reply string correctly
+       (the SASL libraries now care if you pass in the wrong
+       length).
+
+       * Correct various places in smtp.c where the reply string
+       might not have been correctly NUL-terminated. Includes a
+       fix for a particularly nasty and long standing screwup
+       where the buffer length counting in smhear() was totally
+       broken for continued lines from the server.
+
 2008-04-29  Peter Maydell  <pmaydell@chiark.greenend.org.uk>
 
        * Port fix from trunk for SASL not working with newer libsasl.