1 files changed, 85 insertions, 0 deletions
diff --git a/protocols/Tox/tox/include/toxdns.h b/protocols/Tox/tox/include/toxdns.h
new file mode 100644
index 0000000000..a0cc323b43
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+++ b/protocols/Tox/tox/include/toxdns.h
@@ -0,0 +1,85 @@
+/* toxdns.h
+ *
+ * Tox secure username DNS toxid resolving functions.
+ *
+ *  Copyright (C) 2014 Tox project All Rights Reserved.
+ *
+ *  This file is part of Tox.
+ *
+ *  Tox is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  Tox 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with Tox.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef TOXDNS_H
+#define TOXDNS_H
+
+#include <stdint.h>
+
+/* How to use this api to make secure tox dns3 requests:
+ *
+ * 1. Get the public key of a server that supports tox dns3.
+ * 2. use tox_dns3_new() to create a new object to create DNS requests
+ * and handle responses for that server.
+ * 3. Use tox_generate_dns3_string() to generate a string based on the name we want to query and a request_id
+ * that must be stored somewhere for when we want to decrypt the response.
+ * 4. take the string and use it for your DNS request like this:
+ * _4haaaaipr1o3mz0bxweox541airydbovqlbju51mb4p0ebxq.rlqdj4kkisbep2ks3fj2nvtmk4daduqiueabmexqva1jc._tox.utox.org
+ * 5. The TXT in the DNS you receive should look like this:
+ * v=tox3;id=2vgcxuycbuctvauik3plsv3d3aadv4zfjfhi3thaizwxinelrvigchv0ah3qjcsx5qhmaksb2lv2hm5cwbtx0yp
+ * 6. Take the id string and use it with tox_decrypt_dns3_TXT() and the request_id corresponding to the
+ * request we stored earlier to get the Tox id returned by the DNS server.
+ */
+
+/* Create a new tox_dns3 object for server with server_public_key of size TOX_CLIENT_ID_SIZE.
+ *
+ * return Null on failure.
+ * return pointer object on success.
+ */
+void *tox_dns3_new(uint8_t *server_public_key);
+
+/* Destroy the tox dns3 object.
+ */
+void tox_dns3_kill(void *dns3_object);
+
+/* Generate a dns3 string of string_max_len used to query the dns server referred to by to
+ * dns3_object for a tox id registered to user with name of name_len.
+ *
+ * the uint32_t pointed by request_id will be set to the request id which must be passed to
+ * tox_decrypt_dns3_TXT() to correctly decode the response.
+ *
+ * This is what the string returned looks like:
+ * 4haaaaipr1o3mz0bxweox541airydbovqlbju51mb4p0ebxq.rlqdj4kkisbep2ks3fj2nvtmk4daduqiueabmexqva1jc
+ *
+ * returns length of string on sucess.
+ * returns -1 on failure.
+ */
+int tox_generate_dns3_string(void *dns3_object, uint8_t *string, uint16_t string_max_len, uint32_t *request_id,
+                             uint8_t *name, uint8_t name_len);
+
+/* Decode and decrypt the id_record returned of length id_record_len into
+ * tox_id (needs to be at least TOX_FRIEND_ADDRESS_SIZE).
+ *
+ * request_id is the request id given by tox_generate_dns3_string() when creating the request.
+ *
+ * the id_record passed to this function should look somewhat like this:
+ * 2vgcxuycbuctvauik3plsv3d3aadv4zfjfhi3thaizwxinelrvigchv0ah3qjcsx5qhmaksb2lv2hm5cwbtx0yp
+ *
+ * returns -1 on failure.
+ * returns 0 on success.
+ *
+ */
+int tox_decrypt_dns3_TXT(void *dns3_object, uint8_t *tox_id, uint8_t *id_record, uint32_t id_record_len,
+                         uint32_t request_id);
+
+#endif