From 410ee2f6b97f0eee468f4b31dfa339dec7e42eaa Mon Sep 17 00:00:00 2001
From: Tim Kourt <tim.a.kourt@linux.intel.com>
Date: Thu, 20 Sep 2018 16:38:24 -0700
Subject: [PATCH] eap-tls-common: introduce utility functions for eap-tls

---
 Makefile.am          |  6 ++--
 src/eap-tls-common.c | 72 ++++++++++++++++++++++++++++++++++++++++++++
 src/eap-tls-common.h | 33 ++++++++++++++++++++
 3 files changed, 109 insertions(+), 2 deletions(-)
 create mode 100644 src/eap-tls-common.c
 create mode 100644 src/eap-tls-common.h

diff --git a/Makefile.am b/Makefile.am
index c7654731..937f105f 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -97,7 +97,8 @@ eap_sources = src/eap.c src/eap.h src/eap-private.h \
 				src/wscutil.h src/wscutil.c \
 				src/simutil.h src/simutil.c \
 				src/simauth.h src/simauth.c \
-				src/watchlist.h src/watchlist.c
+				src/watchlist.h src/watchlist.c \
+				src/eap-tls-common.h src/eap-tls-common.c
 
 if DAEMON
 libexec_PROGRAMS += src/iwd
@@ -318,7 +319,8 @@ unit_test_eapol_SOURCES = unit/test-eapol.c \
 				src/handshake.h src/handshake.c \
 				src/eap.h src/eap.c src/eap-private.h \
 				src/eap-tls.c src/eap-ttls.c \
-				src/eap-md5.c src/util.c
+				src/eap-md5.c src/util.c \
+				src/eap-tls-common.h src/eap-tls-common.c
 unit_test_eapol_LDADD = ell/libell-internal.la
 
 unit_test_ssid_to_utf8_SOURCES = src/util.h src/util.c \
diff --git a/src/eap-tls-common.c b/src/eap-tls-common.c
new file mode 100644
index 00000000..f46c0b90
--- /dev/null
+++ b/src/eap-tls-common.c
@@ -0,0 +1,72 @@
+/*
+ *
+ *  Wireless daemon for Linux
+ *
+ *  Copyright (C) 2018  Intel Corporation. All rights reserved.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <ell/ell.h>
+
+#include "eap-tls-common.h"
+
+struct databuf *databuf_new(size_t capacity)
+{
+	struct databuf *databuf;
+
+	if (!capacity)
+		return NULL;
+
+	databuf = l_new(struct databuf, 1);
+	databuf->data = l_malloc(capacity);
+	databuf->capacity = capacity;
+
+	return databuf;
+}
+
+void databuf_append(struct databuf *databuf, const uint8_t *data,
+								size_t data_len)
+{
+	size_t new_len;
+
+	if (!databuf)
+		return;
+
+	new_len = databuf->len + data_len;
+
+	if (new_len > databuf->capacity) {
+		databuf->capacity = new_len * 2;
+		databuf->data = l_realloc(databuf->data, databuf->capacity);
+	}
+
+	memcpy(databuf->data + databuf->len, data, data_len);
+
+	databuf->len = new_len;
+}
+
+void databuf_free(struct databuf *databuf)
+{
+	if (!databuf)
+		return;
+
+	l_free(databuf->data);
+	l_free(databuf);
+}
diff --git a/src/eap-tls-common.h b/src/eap-tls-common.h
new file mode 100644
index 00000000..50c93ff6
--- /dev/null
+++ b/src/eap-tls-common.h
@@ -0,0 +1,33 @@
+/*
+ *
+ *  Wireless daemon for Linux
+ *
+ *  Copyright (C) 2018  Intel Corporation. All rights reserved.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+struct databuf {
+	uint8_t *data;
+	size_t len;
+	size_t capacity;
+};
+
+struct databuf;
+struct databuf *databuf_new(size_t capacity);
+void databuf_append(struct databuf *databuf, const uint8_t *data,
+							size_t data_len);
+void databuf_free(struct databuf *databuf);