imap: Introduced IMAP_CUSTOM state

imap: Introduced IMAP_APPEND and IMAP_APPEND_FINAL states

imap: Introduced FETCH_FINAL state for processing final fetch responses

A typical FETCH response can be broken down into four parts:

1) "* <uid> FETCH (<what> {<size>}\r\n", using

imap: Introduced FETCH_FINAL state for processing final fetch responses

A typical FETCH response can be broken down into four parts:

1) "* <uid> FETCH (<what> {<size>}\r\n", using continuation syntax
2) <size> bytes of the actual message
3) ")\r\n", finishing the untagged response
4) "<tag> OK ...", finishing the command

Part 1 is read in imap_fetch_resp(), part 2 is consumed in the PERFORM
phase by the transfer subsystem, parts 3 and 4 are currently ignored.

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imap: Re-factored final IMAP_AUTHENTICATE constant

Changed the final IMAP_AUTHENTICATE constant to IMAP_AUTHENTICATE_FINAL
for consistency with the response function.

imap: Introduced the mailbox variable

Added the mailbox variable to the per-connection structure in
preparation for checking for an already selected mailbox.

email: Slight reordering of connection based variables

Reordered the state and ssl_done variables in order to provide more
consistency between the email protocols as well as for for an u

email: Slight reordering of connection based variables

Reordered the state and ssl_done variables in order to provide more
consistency between the email protocols as well as for for an upcoming
change.

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imap: Tidied up comments for connection based variables

imap: Introduced the mailbox_uidvalidity variable

Added the mailbox_uidvalidity variable to the per-connection structure
in preparation for checking the UIDVALIDITY mailbox attribute.

imap: Removed bytecountp from the per-request structure

Removed this pointer to a downloaded bytes counter because it was set in
imap_init() to point to the same variable the transfer fu

imap: Removed bytecountp from the per-request structure

Removed this pointer to a downloaded bytes counter because it was set in
imap_init() to point to the same variable the transfer functions keep
the count in (k->bytecount), effectively making the code in transfer.c
"*k->bytecountp = k->bytecount" a no-op.

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imap: Introduced new per-request veriables

Added uidvalidity, uid and section variables to the per-request IMAP
structure in preparation for upcoming URL parsing.

pingpong: Renamed curl_ftptransfer to curl_pp_transfer

pingpong: Moved curl_ftptransfer definition to pingpong.h

Moved the ftp transfer structure into pingpong.h so other protocols that
require it don't have to include ftp.h.

imap: Removed some FTP heritage leftovers

Removed user and passwd from the IMAP struct as these cannot be set on
a per-request basis and are leftover from legacy FTP code.

imap: Introduced a custom IMAP structure for per-request data

Created a new IMAP structure and changed the type of the imap proto
variable in connectdata from FTP* to the new IMAP*.

imap: Introduced a custom IMAP structure for per-request data

Created a new IMAP structure and changed the type of the imap proto
variable in connectdata from FTP* to the new IMAP*.

Moved the mailbox variable from the per-connection struct imap_conn to
the new per-request struct and fixed references accordingly.

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email: Post STARTLS capability code tidy up (Part One)

Corrected the order of the CAPA / CAPABILITY state machine constants to
match the execution order.

imap: Added support for the STARTTLS capability (Part One)

Introduced detection of the STARTTLS capability, in order to add support
for TLS upgrades without unconditionally sending the S

imap: Added support for the STARTTLS capability (Part One)

Introduced detection of the STARTTLS capability, in order to add support
for TLS upgrades without unconditionally sending the STARTTLS command.

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imap: Added support for SASL-IR extension (Part 1)

Introduced detection of the SASL-IR capability, in order to add support
for sending the initial response with the AUTHENTICATE command,

imap: Added support for SASL-IR extension (Part 1)

Introduced detection of the SASL-IR capability, in order to add support
for sending the initial response with the AUTHENTICATE command, as per
RFC4959.

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imap: Changed response tag generation to be completely unique

Updated the automatic response tag generation to follow the examples
given in RC3501, which list a 4 character string such a

imap: Changed response tag generation to be completely unique

Updated the automatic response tag generation to follow the examples
given in RC3501, which list a 4 character string such as A001, A002,
etc.

As a unique identifier should be generated for each command the string
generation is based on the connection id and the incrementing command
id.

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imap: Small variable rename in preparation for upcoming change

Renamed a couple of variables and updated some comments in
preparation for upcoming command id / response tag change.

imap.h: Corrected incorrect comment clarification

Corrected comment clarification made in commit 167717b8069a.

imap: Fixed no known authentication mechanism when fallback is required

Fixed an issue where (lib)curl is compiled without support for a
supported challenge-response based SASL authentic

imap: Fixed no known authentication mechanism when fallback is required

Fixed an issue where (lib)curl is compiled without support for a
supported challenge-response based SASL authentication mechanism, such
as CRAM-MD5 or NTLM, the server doesn't support the LOGIN or PLAIN
mechanisms and (lib)curl doesn't fallback to Clear Text authentication.

Note: In order to fallback to Clear Text authentication properly this
fix adds support for the LOGINDISABLED server capability.
imap: Fixed no known authentication mechanism when fallback is required

Fixed an issue where (lib)curl is compiled without support for a
supported challenge-response based SASL authentication mechanism, such
as CRAM-MD5 or NTLM, the server doesn't support the LOGIN or PLAIN
mechanisms and (lib)curl doesn't fallback to Clear Text authentication.

Note: In order to fallback to Clear Text authentication properly this
fix adds support for the LOGINDISABLED server capability.

Related bug: http://curl.haxx.se/mail/lib-2013-02/0004.html
Reported by: Stanislav Ivochkin

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email: Updated comment regarding ssldone usage

Updated the ssldone comment as multi mode is always used internally now.

imap: Added support for sasl digest-md5 authentication

imap: Added support for sasl cram-md5 authentication

imap: Added support for sasl ntlm authentication