First experimental implementation of ESMTP, HELO fallback and various improvements#11

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micia wants to merge 36 commits intocorecode:masterfrom

Commits on Oct 2, 2012

simplify SSL config flag semantics, default is having SSL disabled until crypto.c enables it
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simplify read_remote logic and prevent infinite loops due to pos == len, improve external buffer logic to report actual length to the caller, make it return the actual status code rather than statu…
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rework yet again read_remote to be more secure, add HELO fallback and ESMTP aware functions, rework authentication mechanisms accordingly
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add VERBOSE feature to debug network communication
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various bugfixes to VERBOSE logging and ESMTP parsing
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fix buggy boolean guard
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fix ESMTP parsing
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deliver_host simplify and make mail read loop more reliable
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add VERBOSE option warning to config file
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Commits on Oct 3, 2012

Improve configuration file routines and port parsing
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Fix some issues with format and simplify a condition
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Make config file parsing more solid
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Improve HELO fallback and ESMTP capabilities refresh
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Drop entirely the no login fallback
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Improve message on I/O error
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Replace SECURETRANS with the more specific USESSL (probably SECURETRANS is redundant)
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First implementation of the PLAIN authentication method
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More read_remote improvements, to error handling and parsing
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Minor style fix
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Update man page, minor style fix in config file.
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Fix typo in man page.
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Fix error message
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Avoid mixed declaration and code.
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Make connection structure to avoid modifying global data
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Use memset() to 0 rather than the deprecated bzero()
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Try a better guess in the unlikely event that _SC_OPEN_MAX is unavailable
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Make local mail delivery function check for read errors.
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Fix config file entry parsing
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Revert "Fix config file entry parsing"
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Fix man page entries.
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Simplify logging messages.
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Make PLAIN authentication work
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Some minor fixes
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Consistently replace bcopy() and bzero() with memcpy() and memset()
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Commits on Oct 4, 2012

Clear file error flag
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Check for I/O errors even on mail bounces
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