1 files changed, 44 insertions, 0 deletions
diff --git a/src/util/net.c b/src/util/net.c
index ac7befe07..dd8a1ba46 100644
--- a/src/util/net.c
+++ b/src/util/net.c
@@ -19,6 +19,50 @@
 #define DEFAULT_PORT_GIT   "9418"
 #define DEFAULT_PORT_SSH   "22"
 
+bool git_net_hostname_matches_cert(
+	const char *hostname,
+	const char *pattern)
+{
+	for (;;) {
+		char c = git__tolower(*pattern++);
+
+		if (c == '\0')
+			return *hostname ? false : true;
+
+		if (c == '*') {
+			c = *pattern;
+
+			/* '*' at the end matches everything left */
+			if (c == '\0')
+				return true;
+
+			/*
+			 * We've found a pattern, so move towards the
+			 * next matching char. The '.' is handled
+			 * specially because wildcards aren't allowed
+			 * to cross subdomains.
+			 */
+			while(*hostname) {
+				char h = git__tolower(*hostname);
+
+				if (h == c)
+					return git_net_hostname_matches_cert(hostname++, pattern);
+				else if (h == '.')
+					return git_net_hostname_matches_cert(hostname, pattern);
+
+				hostname++;
+			}
+
+			return false;
+		}
+
+		if (c != git__tolower(*hostname++))
+			return false;
+	}
+
+	return false;
+}
+
 bool git_net_str_is_url(const char *str)
 {
 	const char *c;