Subject: [PATCH 4/4] imap-send: refactor function host_matches()

From: Beat Bolli <[email-masked]>
Date: Wed, 11 Mar 2026 13:11:07 +0100

Move the ASN1_STRING access and the associated cast into host_matches()
to simplify both callers.

Signed-off-by: Beat Bolli <[email-masked]>
---
 imap-send.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/imap-send.c b/imap-send.c
index 2bb0003f08..789055d7fd 100644
--- a/imap-send.c
+++ b/imap-send.c
@@ -219,8 +219,9 @@ static int ssl_socket_connect(struct imap_socket *sock UNUSED,
 
 #else
 
-static int host_matches(const char *host, const char *pattern)
+static int host_matches(const char *host, const ASN1_STRING *asn1_str)
 {
+	const char *pattern = (const char *)ASN1_STRING_get0_data(asn1_str);
 	if (pattern[0] == '*' && pattern[1] == '.') {
 		pattern += 2;
 		if (!(host = strchr(host, '.')))
@@ -252,8 +253,7 @@ static int verify_hostname(X509 *cert, const char *hostname)
 			GENERAL_NAME *subj_alt_name = sk_GENERAL_NAME_value(subj_alt_names, i);
 			ASN1_STRING *subj_alt_str = GENERAL_NAME_get0_value(subj_alt_name, &ntype);
 
-			if (ntype == GEN_DNS &&
-			    host_matches(hostname, (const char *)ASN1_STRING_get0_data(subj_alt_str)))
+			if (ntype == GEN_DNS && host_matches(hostname, subj_alt_str))
 				found = 1;
 		}
 		sk_GENERAL_NAME_pop_free(subj_alt_names, GENERAL_NAME_free);
@@ -268,7 +268,7 @@ static int verify_hostname(X509 *cert, const char *hostname)
 	    (cname_entry = X509_NAME_get_entry(subj, i)) == NULL ||
 	    (cname = X509_NAME_ENTRY_get_data(cname_entry)) == NULL)
 		return error("cannot get certificate common name");
-	if (host_matches(hostname, (const char *)ASN1_STRING_get0_data(cname)))
+	if (host_matches(hostname, cname))
 		return 0;
 	return error("certificate owner '%s' does not match hostname '%s'",
 		     ASN1_STRING_get0_data(cname), hostname);
-- 
2.51.0