early-access version 2698

externals/libressl/ssl/tls_content.c

@@ -0,0 +1,149 @@
+/* $OpenBSD: tls_content.c,v 1.1 2021/09/04 16:26:12 jsing Exp $ */
+/*
+ * Copyright (c) 2020 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 <stdlib.h>
+#include <string.h>
+
+#include "tls_content.h"
+
+/* Content from a TLS record. */
+struct tls_content {
+	uint8_t type;
+	uint16_t epoch;
+
+	const uint8_t *data;
+	size_t len;
+	CBS cbs;
+};
+
+struct tls_content *
+tls_content_new(void)
+{
+	return calloc(1, sizeof(struct tls_content));
+}
+
+void
+tls_content_clear(struct tls_content *content)
+{
+	freezero((void *)content->data, content->len);
+	memset(content, 0, sizeof(*content));
+}
+
+void
+tls_content_free(struct tls_content *content)
+{
+	if (content == NULL)
+		return;
+
+	tls_content_clear(content);
+
+	freezero(content, sizeof(struct tls_content));
+}
+
+CBS *
+tls_content_cbs(struct tls_content *content)
+{
+	return &content->cbs;
+}
+
+int
+tls_content_equal(struct tls_content *content, const uint8_t *buf, size_t n)
+{
+	return CBS_mem_equal(&content->cbs, buf, n);
+}
+
+size_t
+tls_content_remaining(struct tls_content *content)
+{
+	return CBS_len(&content->cbs);
+}
+
+uint8_t
+tls_content_type(struct tls_content *content)
+{
+	return content->type;
+}
+
+int
+tls_content_dup_data(struct tls_content *content, uint8_t type,
+    const uint8_t *data, size_t data_len)
+{
+	uint8_t *dup;
+
+	if ((dup = calloc(1, data_len)) == NULL)
+		return 0;
+	memcpy(dup, data, data_len);
+
+	tls_content_set_data(content, type, dup, data_len);
+
+	return 1;
+}
+
+uint16_t
+tls_content_epoch(struct tls_content *content)
+{
+	return content->epoch;
+}
+
+void
+tls_content_set_epoch(struct tls_content *content, uint16_t epoch)
+{
+	content->epoch = epoch;
+}
+
+void
+tls_content_set_data(struct tls_content *content, uint8_t type,
+    const uint8_t *data, size_t data_len)
+{
+	tls_content_clear(content);
+
+	content->type = type;
+	content->data = data;
+	content->len = data_len;
+
+	CBS_init(&content->cbs, content->data, content->len);
+}
+
+static ssize_t
+tls_content_read_internal(struct tls_content *content, uint8_t *buf, size_t n,
+    int peek)
+{
+	if (n > CBS_len(&content->cbs))
+		n = CBS_len(&content->cbs);
+
+	/* XXX - CBS_memcpy? CBS_copy_bytes? */
+	memcpy(buf, CBS_data(&content->cbs), n);
+
+	if (!peek) {
+		if (!CBS_skip(&content->cbs, n))
+			return -1;
+	}
+
+	return n;
+}
+
+ssize_t
+tls_content_peek(struct tls_content *content, uint8_t *buf, size_t n)
+{
+	return tls_content_read_internal(content, buf, n, 1);
+}
+
+ssize_t
+tls_content_read(struct tls_content *content, uint8_t *buf, size_t n)
+{
+	return tls_content_read_internal(content, buf, n, 0);
+}