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));
}
struct wpabuf * ndef_build_wifi_hc(int begin)
{
struct wpabuf *hc, *carrier;
carrier = wpabuf_alloc(2 + os_strlen(wifi_handover_type));
if (carrier == NULL)
return NULL;
wpabuf_put_u8(carrier, 0x02); /* Carrier Type Format */
wpabuf_put_u8(carrier, os_strlen(wifi_handover_type));
wpabuf_put_str(carrier, wifi_handover_type);
hc = ndef_build_record((begin ? FLAG_MESSAGE_BEGIN : 0) |
FLAG_MESSAGE_END | FLAG_TNF_NFC_FORUM, "Hc", 2,
"0", 1, carrier);
wpabuf_free(carrier);
return hc;
}
struct wpabuf * ndef_build_p2p(const struct wpabuf *buf)
{
return ndef_build_record(FLAG_MESSAGE_BEGIN | FLAG_MESSAGE_END |
FLAG_TNF_RFC2046, p2p_handover_type,
os_strlen(p2p_handover_type), NULL, 0, buf);
}
struct wpabuf * ndef_build_wifi_hr(void)
{
struct wpabuf *rn, *cr, *ac_payload, *ac, *hr_payload, *hr;
struct wpabuf *hc;
rn = wpabuf_alloc(2);
if (rn == NULL)
return NULL;
wpabuf_put_be16(rn, os_random() & 0xffff);
cr = ndef_build_record(FLAG_MESSAGE_BEGIN | FLAG_TNF_NFC_FORUM, "cr", 2,
NULL, 0, rn);
wpabuf_free(rn);
if (cr == NULL)
return NULL;
ac_payload = wpabuf_alloc(4);
if (ac_payload == NULL) {
wpabuf_free(cr);
return NULL;
}
wpabuf_put_u8(ac_payload, 0x01); /* Carrier Flags: CRS=1 "active" */
wpabuf_put_u8(ac_payload, 0x01); /* Carrier Data Reference Length */
wpabuf_put_u8(ac_payload, '0'); /* Carrier Data Reference: "0" */
wpabuf_put_u8(ac_payload, 0); /* Aux Data Reference Count */
ac = ndef_build_record(FLAG_MESSAGE_END | FLAG_TNF_NFC_FORUM, "ac", 2,
NULL, 0, ac_payload);
wpabuf_free(ac_payload);
if (ac == NULL) {
wpabuf_free(cr);
return NULL;
}
hr_payload = wpabuf_alloc(1 + wpabuf_len(cr) + wpabuf_len(ac));
if (hr_payload == NULL) {
wpabuf_free(cr);
wpabuf_free(ac);
return NULL;
}
wpabuf_put_u8(hr_payload, 0x12); /* Connection Handover Version 1.2 */
wpabuf_put_buf(hr_payload, cr);
wpabuf_put_buf(hr_payload, ac);
wpabuf_free(cr);
wpabuf_free(ac);
hr = ndef_build_record(FLAG_MESSAGE_BEGIN | FLAG_TNF_NFC_FORUM, "Hr", 2,
NULL, 0, hr_payload);
wpabuf_free(hr_payload);
if (hr == NULL)
return NULL;
hc = ndef_build_wifi_hc(0);
if (hc == NULL) {
wpabuf_free(hr);
return NULL;
}
return wpabuf_concat(hr, hc);
}