Provide an error framework for use with the TLSv1.3 code.

This is based on the libtls error handling code, but adds machine readable
codes and subcodes. We then map these codes back to libssl error codes.

ok beck@ inoguchi@

1 files changed, 99 insertions, 0 deletions

diff --git a/lib/libssl/tls13_error.c b/lib/libssl/tls13_error.c
new file mode 100644
index 00000000000..295b6c4fab0
--- /dev/null
+++ b/lib/libssl/tls13_error.c
@@ -0,0 +1,99 @@
+/* $OpenBSD: tls13_error.c,v 1.1 2020/01/20 13:10:37 jsing Exp $ */
+/*
+ * Copyright (c) 2014,2019 Joel Sing <jsing@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <errno.h>
+
+#include "tls13_internal.h"
+
+void
+tls13_error_clear(struct tls13_error *error)
+{
+	error->code = 0;
+	error->subcode = 0;
+	error->errnum = 0;
+	error->file = NULL;
+	error->line = 0;
+	free(error->msg);
+	error->msg = NULL;
+}
+
+static int
+tls13_error_vset(struct tls13_error *error, int code, int subcode, int errnum,
+    const char *file, int line, const char *fmt, va_list ap)
+{
+	char *errmsg = NULL;
+	int rv = -1;
+
+	tls13_error_clear(error);
+
+	error->code = code;
+	error->subcode = subcode;
+	error->errnum = errnum;
+	error->file = file;
+	error->line = line;
+
+	if (vasprintf(&errmsg, fmt, ap) == -1) {
+		errmsg = NULL;
+		goto err;
+	}
+
+	if (errnum == -1) {
+		error->msg = errmsg;
+		return 0;
+	}
+
+	if (asprintf(&error->msg, "%s: %s", errmsg, strerror(errnum)) == -1) {
+		error->msg = NULL;
+		goto err;
+	}
+	rv = 0;
+
+ err:
+	free(errmsg);
+
+	return rv;
+}
+
+int
+tls13_error_set(struct tls13_error *error, int code, int subcode,
+    const char *file, int line, const char *fmt, ...)
+{
+	va_list ap;
+	int errnum, rv;
+
+	errnum = errno;
+
+	va_start(ap, fmt);
+	rv = tls13_error_vset(error, code, subcode, errnum, file, line, fmt, ap);
+	va_end(ap);
+
+	return (rv);
+}
+
+int
+tls13_error_setx(struct tls13_error *error, int code, int subcode,
+    const char *file, int line, const char *fmt, ...)
+{
+	va_list ap;
+	int rv;
+
+	va_start(ap, fmt);
+	rv = tls13_error_vset(error, code, subcode, -1, file, line, fmt, ap);
+	va_end(ap);
+
+	return (rv);
+}