[PATCH 1/3] imap-send: prepare for OpenSSL 4.1

[Beat Bolli <dev+git@drbeat.li>]

OpenSSL master (to be v4.1 after the release) renamed the function
ASN1_STRING_length() to ASN1_STRING_get_length(). Map the new name to
the old one if we're compiling with a pre-4.1 version.

Signed-off-by: Beat Bolli <dev+git@drbeat.li>
---
 imap-send.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/imap-send.c b/imap-send.c
index 0d16d02029..977d78005c 100644
--- a/imap-send.c
+++ b/imap-send.c
@@ -219,12 +219,17 @@ static int ssl_socket_connect(struct imap_socket *sock UNUSED,
 
 #else
 
+#if (OPENSSL_VERSION_NUMBER < 0x40100000L)
+// map to the pre-4.1 name
+#define ASN1_STRING_get_length(s) ASN1_STRING_length(s)
+#endif
+
 static int host_matches(const char *host, const ASN1_STRING *asn1_str)
 {
 	const char *pattern = (const char *)ASN1_STRING_get0_data(asn1_str);
 
 	/* embedded NUL characters may open a security hole */
-	if (memchr(pattern, '\0', ASN1_STRING_length(asn1_str)))
+	if (memchr(pattern, '\0', ASN1_STRING_get_length(asn1_str)))
 	    return 0;
 
 	if (pattern[0] == '*' && pattern[1] == '.') {
-- 
2.53.0