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workaround iCloud IMAP bug

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thanks to Sabahattin Gucukoglu <listsebby@me.com> for the thorough
investigation.

REFMAIL: 29C5E84D-5FE7-47BB-9A14-2EC34D3921C5@me.com
This commit is contained in:
Oswald Buddenhagen 2022-05-20 09:54:50 +02:00
parent d6b9a139e4
commit ee9fd2f5c7
1 changed files with 10 additions and 1 deletions
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11
src/drv_imap.c
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@ -126,6 +126,7 @@ union imap_store {
enum { FetchNone, FetchMsgs, FetchUidNext } fetch_sts;
uint got_namespace:1;
uint has_forwarded:1;
uint capability_hack:1;
char delimiter[2]; // Hierarchy delimiter
char *ns_prefix, ns_delimiter; // NAMESPACE info
string_list_t *boxes; // _list results
@ -1311,6 +1312,8 @@ parse_response_code( imap_store_t *ctx, imap_cmd_t *cmd, char *s )
}
*p = 0;
parse_capability( ctx, s );
if (strstr( p + 1, "mac.com IMAP4 service (Oracle Communications Messaging Server" ))
ctx->capability_hack = 1;
} else if (!strcmp( "ALERT]", arg )) {
/* RFC2060 says that these messages MUST be displayed
* to the user
@ -2519,7 +2522,13 @@ imap_open_store_authenticate2_p2( imap_store_t *ctx, imap_cmd_t *cmd ATTR_UNUSED
if (response == RESP_NO) {
imap_open_store_bail( ctx, FAIL_FINAL );
} else if (response == RESP_OK) {
if (!ctx->caps)
// iCloud (imap.mail.me.com) apparently runs the real server behind a
// proxy that injects XAPPLEPUSHSERVICE into (and deletes STARTTLS from)
// the server's outgoing data stream following occurrences of CAPABILITY.
// This process is rather indiscriminate, so it will mess up IMAP
// literals if it is not deactivated in time by issuing a (redundant)
// CAPABILITY command after logging in.
if (!ctx->caps || ctx->capability_hack)
imap_exec( ctx, NULL, imap_open_store_authenticate2_p3, "CAPABILITY" );
else
imap_open_store_compress( ctx );