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XOAUTH2 would be selected in preference to LOGIN and PLAIN if the IMAP
or SMTP server advertised support for it even though a user's password
was supplied but bearer token wasn't.
Modified the selection logic so that XOAUTH2 will only be selected if
the server supports it and A) The curl user/libcurl programmer has
specifically asked for XOAUTH via the ;AUTH=XOAUTH login option or 2)
The bearer token is specified. Obviously if XOAUTH is asked for via
the login option but no token is specified the user will receive a
authentication failure which makes more sense than no known
authentication mechanisms supported!
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Added the ability to use an XOAUTH2 bearer token [RFC6750] with SMTP for
authentication using RFC6749 "OAuth 2.0 Authorization Framework".
The bearer token is expected to be valid for the user specified in
conn->user. If CURLOPT_XOAUTH2_BEARER is defined and the connection has
an advertised auth mechanism of "XOAUTH2", the user and access token are
formatted as a base64 encoded string and sent to the server as
"AUTH XOAUTH2 <bearer token>".
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All protocol handler structs are now opaque (void *) in the
SessionHandle struct and moved in the request-specific sub-struct
'SingleRequest'. The intension is to keep the protocol specific
knowledge in their own dedicated source files [protocol].c etc.
There's some "leakage" where this policy is violated, to be addressed at
a later point in time.
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1 - always allocate the struct in protocol->setup_connection. Some
protocol handlers had to get this function added.
2 - always free at the end of a request. This is also an attempt to keep
less memory in the handle after it is completed.
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comparison between signed and unsigned integer expressions
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If the mail sent during the transfer contains a terminating <CRLF> then
we should not send the first <CRLF> of the EOB as specified in RFC-5321.
Additionally don't send the <CRLF> if there is "no mail data" as the
DATA command already includes it.
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Move the eob counter from the smtp_conn structure to the SMTP structure
as it is associated with a SMTP payload on a per-request basis.
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The curl command line utility would display the the completed progress
bar with a percentage of zero as the progress routines didn't know the
size of the transfer.
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Removed the hard returns from imap and pop3 by using the same style for
sending the authentication string as smtp. Moved the "Other mechanisms
not supported" check in smtp to match that of imap and pop3 to provide
consistency between the three email protocols.
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Updated the default behaviour of sending the client's initial response in the AUTH
command to not send it and added support for CURLOPT_SASL_IR to allow the user to
specify including the response.
Related Bug: http://curl.haxx.se/mail/lib-2012-03/0114.html
Reported-by: Gokhan Sengun
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Standardised the naming of all perform based functions to be in the form
smtp_perform_something().
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Updated the coding style, in this function, to be consistant with other
response functions rather then performing a hard return on failure.
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Added support for specifying the preferred authentication mechanism in
the URL as per Internet-Draft 'draft-earhart-url-smtp-00'.
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warning: unused variable 'smtp' introduced in commit 73cbd21b5ee6.
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Updated the function description comments following commit 4838d196fdbf.
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Moved the blocking state machine to the disconnect functions so that the
logout / quit functions are only responsible for sending the actual
command needed to logout or quit.
Additionally removed the hard return on failure.
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Added comments and simplified convoluted dophase_done comparison.
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Removed unwanted braces and added variable initialisation.
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Optimised the result test in each of the block_statemach() functions.
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Some state changes would be performed after a failure test that
performed a hard return, whilst others would be performed within a test
for success. Updated the code, for consistency, so all instances are
performed within a success test.
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Small tidy up to keep some comments consistant across each of the email
protocols.
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Following commit ad3177da24b8 corrected the debug message in state()
from AUTH to AUTH_FINAL.
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Changed the final SMTP_AUTH constant to SMTP_AUTH_FINAL for consistency
with the response function.
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Removed this pointer to a downloaded bytes counter because it was set in
smtp_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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Removed user and passwd from the SMTP struct as these cannot be set on
a per-request basis and are leftover from legacy FTP code.
Changed some comments still using FTP terminology.
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Moved the rcpt variable from the per-connection struct smtp_conn to the
new per-request struct and fixed references accordingly.
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Created a new SMTP structure and changed the type of the smtp proto
variable in connectdata from FTP* to SMTP*.
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Tidied up result variables to be consistent in name, declaration order
and default values.
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Due to the reordering of functions in commit 586f5d361474 the forward
declaration to state_upgrade_tls() are no longer required.
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... since they're not used by the easy interface really, I wanted to
remove the association. Also, I unified the pingpong statemachine driver
into a single function with a 'wait' argument: Curl_pp_statemach.
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Remove tailing whitespace introduced in commit 7ed689d24a4e.
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Renamed smtp_state_auth_resp() function to match the implementations in
IMAP and POP3.
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