isync / openssl3 / gmail

[Norbert P. <no...@pr...>]

Hi all,

I am running Arch, and they switched to OpenSSL3. This ended with a
non-working GMail sync because openssl gave an error

	error:14095126:SSL routines:ssl3_read_n:unexpected eof while reading

See also this comment https://github.com/openssl/openssl/issues/11381#issuecomment-602229519

There is a fix in recent PHP: 
https://github.com/php/php-src/commit/74f75db0c3665677ec006cd379fd561feacffdc6
that is easily ported to isync:

--- ./src/socket.c.orig	2022-11-07 19:54:41.106669469 +0900
+++ ./src/socket.c	2022-11-07 19:54:32.709760697 +0900
@@ -263,6 +263,10 @@
 	if (!(conf->ssl_versions & TLSv1_3))
 		options |= SSL_OP_NO_TLSv1_3;
 #endif
+#ifdef SSL_OP_IGNORE_UNEXPECTED_EOF
+	/* Only for OpenSSL 3+ to keep OpenSSL 1.1.1 behavior */
+	options |= SSL_OP_IGNORE_UNEXPECTED_EOF;
+#endif
 
 	SSL_CTX_set_options( mconf->SSLContext, options );
 
I am not sure this is the **proper** fix, but for now to get a working
gmail sync I applied that locally.

Thanks and all the best

Norbert

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