ssl: Set an error when we receive SSL_ERROR_SYSCALL

The OpenSSL docs say:
> For socket I/O on Unix systems, consult errno for details

but also:
> This value can also be returned for other errors,
> check the error queue for details.

This means it's possible errno isn't set, in which case
we may appear to have reached an EOF when we did not.

1 files changed, 1 insertions, 0 deletions

diff --git a/methods/connect.cc b/methods/connect.cc
index b00e73eb7..c685ac031 100644
--- a/methods/connect.cc
+++ b/methods/connect.cc
@@ -849,6 +849,7 @@ struct TlsFd final : public MethodFd
 	 break;
       case SSL_ERROR_SYSCALL:
 	 broken = true;
+	 _error->Errno("openssl", "OpenSSL system call error: %s\n", ssl_strerr());
 	 break;
       case SSL_ERROR_SSL:
 	 broken = true;