remove @EAP_LDFLAGS@, no longer exists

[mech_eap.git] / libeap / src / wps / ndef.c

diff --git a/libeap/src/wps/ndef.c b/libeap/src/wps/ndef.c
new file mode 100644 (file)
index 0000000..9baec7f
--- /dev/null
+++ b/libeap/src/wps/ndef.c
@@ -0,0 +1,175 @@
+/*
+ * NDEF(NFC Data Exchange Format) routines for Wi-Fi Protected Setup
+ *   Reference is "NFCForum-TS-NDEF_1.0 2006-07-24".
+ * Copyright (c) 2009, Masashi Honma <honma@ictec.co.jp>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Alternatively, this software may be distributed under the terms of BSD
+ * license.
+ *
+ * See README and COPYING for more details.
+ */
+
+#include "includes.h"
+#include "common.h"
+#include "wps/wps.h"
+#include "wps/wps_i.h"
+
+#define FLAG_MESSAGE_BEGIN (1 << 7)
+#define FLAG_MESSAGE_END (1 << 6)
+#define FLAG_CHUNK (1 << 5)
+#define FLAG_SHORT_RECORD (1 << 4)
+#define FLAG_ID_LENGTH_PRESENT (1 << 3)
+#define FLAG_TNF_RFC2046 (0x02)
+
+struct ndef_record {
+       u8 *type;
+       u8 *id;
+       u8 *payload;
+       u8 type_length;
+       u8 id_length;
+       u32 payload_length;
+       u32 total_length;
+};
+
+static char wifi_handover_type[] = "application/vnd.wfa.wsc";
+
+static int ndef_parse_record(u8 *data, u32 size, struct ndef_record *record)
+{
+       u8 *pos = data + 1;
+
+       if (size < 2)
+               return -1;
+       record->type_length = *pos++;
+       if (data[0] & FLAG_SHORT_RECORD) {
+               if (size < 3)
+                       return -1;
+               record->payload_length = *pos++;
+       } else {
+               if (size < 6)
+                       return -1;
+               record->payload_length = ntohl(*(u32 *)pos);
+               pos += sizeof(u32);
+       }
+
+       if (data[0] & FLAG_ID_LENGTH_PRESENT) {
+               if ((int) size < pos - data + 1)
+                       return -1;
+               record->id_length = *pos++;
+       } else
+               record->id_length = 0;
+
+       record->type = record->type_length == 0 ? NULL : pos;
+       pos += record->type_length;
+
+       record->id = record->id_length == 0 ? NULL : pos;
+       pos += record->id_length;
+
+       record->payload = record->payload_length == 0 ? NULL : pos;
+       pos += record->payload_length;
+
+       record->total_length = pos - data;
+       if (record->total_length > size)
+               return -1;
+       return 0;
+}
+
+
+static struct wpabuf * ndef_parse_records(struct wpabuf *buf,
+                                         int (*filter)(struct ndef_record *))
+{
+       struct ndef_record record;
+       int len = wpabuf_len(buf);
+       u8 *data = wpabuf_mhead(buf);
+
+       while (len > 0) {
+               if (ndef_parse_record(data, len, &record) < 0) {
+                       wpa_printf(MSG_ERROR, "NDEF : Failed to parse");
+                       return NULL;
+               }
+               if (filter == NULL || filter(&record))
+                       return wpabuf_alloc_copy(record.payload,
+                                                record.payload_length);
+               data += record.total_length;
+               len -= record.total_length;
+       }
+       wpa_printf(MSG_ERROR, "NDEF : Record not found");
+       return NULL;
+}
+
+
+static struct wpabuf * ndef_build_record(u8 flags, void *type,
+                                        u8 type_length, void *id,
+                                        u8 id_length, void *payload,
+                                        u32 payload_length)
+{
+       struct wpabuf *record;
+       size_t total_len;
+       int short_record;
+       u8 local_flag;
+
+       short_record = payload_length < 256 ? 1 : 0;
+
+       total_len = 2; /* flag + type length */
+       /* payload length */
+       total_len += short_record ? sizeof(u8) : sizeof(u32);
+       if (id_length > 0)
+               total_len += 1;
+       total_len += type_length + id_length + payload_length;
+       record = wpabuf_alloc(total_len);
+       if (record == NULL) {
+               wpa_printf(MSG_ERROR, "NDEF : Failed to allocate "
+                          "record for build");
+               return NULL;
+       }
+
+       local_flag = flags;
+       if (id_length > 0)
+               local_flag |= FLAG_ID_LENGTH_PRESENT;
+       if (short_record)
+               local_flag |= FLAG_SHORT_RECORD;
+       wpabuf_put_u8(record, local_flag);
+
+       wpabuf_put_u8(record, type_length);
+
+       if (short_record)
+               wpabuf_put_u8(record, payload_length);
+       else
+               wpabuf_put_be32(record, payload_length);
+
+       if (id_length > 0)
+               wpabuf_put_u8(record, id_length);
+       wpabuf_put_data(record, type, type_length);
+       wpabuf_put_data(record, id, id_length);
+       wpabuf_put_data(record, payload, payload_length);
+       return record;
+}
+
+
+static int wifi_filter(struct ndef_record *record)
+{
+       if (record->type_length != os_strlen(wifi_handover_type))
+               return 0;
+       if (os_memcmp(record->type, wifi_handover_type,
+                     os_strlen(wifi_handover_type)) != 0)
+               return 0;
+       return 1;
+}
+
+
+struct wpabuf * ndef_parse_wifi(struct wpabuf *buf)
+{
+       return ndef_parse_records(buf, wifi_filter);
+}
+
+
+struct wpabuf * ndef_build_wifi(struct wpabuf *buf)
+{
+       return ndef_build_record(FLAG_MESSAGE_BEGIN | FLAG_MESSAGE_END |
+                                FLAG_TNF_RFC2046, wifi_handover_type,
+                                os_strlen(wifi_handover_type), NULL, 0,
+                                wpabuf_mhead(buf), wpabuf_len(buf));
+}