Remove deprecated ToxDNS

Based on #331.

Fixes #42.

12 files changed, 8 insertions, 533 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index f794982f..2ee15b95 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,11 +6,11 @@
 # - A number of small libraries (.a/.so/...) containing independent components
 #   of toxcore. E.g. the DHT has its own library, and the system/network
 #   abstractions are in their own library as well. These libraries are not
-#   installed on `make install`. The toxdns, toxav, and toxencryptsave
-#   libraries are also not installed.
+#   installed on `make install`. The toxav, and toxencryptsave libraries are
+#   also not installed.
 # - A number of small programs, statically linked if possible.
-# - One big library containing all of the toxcore, toxav, toxdns, and
-#   toxencryptsave code.
+# - One big library containing all of the toxcore, toxav, and toxencryptsave
+#   code.
 #
 ################################################################################
 
@@ -328,15 +328,10 @@ endif()
 
 ################################################################################
 #
-# :: ToxDNS and block encryption libraries
+# :: Block encryption libraries
 #
 ################################################################################
 
-add_submodule(toxcore toxdns
-  toxdns/toxdns.c)
-target_link_modules(toxdns toxnetwork)
-set(toxdns_API_HEADERS ${toxcore_SOURCE_DIR}/toxdns/toxdns.h^tox)
-
 apidsl(toxencryptsave/toxencryptsave.api.h)
 add_submodule(toxcore toxencryptsave
   toxencryptsave/toxencryptsave.c
@@ -570,9 +565,6 @@ target_link_modules(DHT_test toxdht)
 add_c_executable(Messenger_test testing/Messenger_test.c)
 target_link_modules(Messenger_test toxmessenger)
 
-add_c_executable(dns3_test testing/dns3_test.c)
-target_link_modules(dns3_test toxdns)
-
 if(NOT WIN32)
   add_c_executable(tox_sync testing/tox_sync.c)
   target_link_modules(tox_sync toxcore)
diff --git a/INSTALL.md b/INSTALL.md
index 78cfa830..818edf06 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -243,7 +243,6 @@ If it worked, you should have all the toxcore dylibs in /usr/local/lib: (besides
 $ ls -la /usr/local/lib/libtox*.dylib
 libtoxav.0.dylib
 libtoxcore.0.dylib
-libtoxdns.0.dylib
 libtoxencryptsave.0.dylib
 to check what CPU architecture they're compiled for:
 $ lipo -i /usr/local/lib/libtoxencryptsave.0.dylib
@@ -414,7 +413,6 @@ mkdir tmp
 cd tmp
 $WINDOWS_TOOLCHAIN-ar x ../lib/libtoxcore.a
 $WINDOWS_TOOLCHAIN-ar x ../lib/libtoxav.a
-$WINDOWS_TOOLCHAIN-ar x ../lib/libtoxdns.a
 $WINDOWS_TOOLCHAIN-ar x ../lib/libtoxencryptsave.a
 $WINDOWS_TOOLCHAIN-gcc -Wl,--export-all-symbols -Wl,--out-implib=libtox.dll.a -shared -o libtox.dll *.o ../lib/*.a /usr/$WINDOWS_TOOLCHAIN/lib/libwinpthread.a -liphlpapi -lws2_32 -static-libgcc
 ```
diff --git a/build/Makefile.am b/build/Makefile.am
index e4f36509..c5c170a3 100644
--- a/build/Makefile.am
+++ b/build/Makefile.am
@@ -17,7 +17,6 @@ LT_LDFLAGS=-avoid-version
 endif
 
 include ../toxcore/Makefile.inc
-include ../toxdns/Makefile.inc
 include ../toxencryptsave/Makefile.inc
 include ../toxav/Makefile.inc
 include ../other/Makefile.inc
diff --git a/libtoxcore.pc.in b/libtoxcore.pc.in
index 90bb6c28..d9d7fb79 100644
--- a/libtoxcore.pc.in
+++ b/libtoxcore.pc.in
@@ -7,5 +7,5 @@ Name: libtoxcore
 Description: Tox protocol library
 Requires:
 Version: @PACKAGE_VERSION@
-Libs: @NACL_OBJECTS_PKGCONFIG@ -L${libdir} -ltoxcore @NACL_LDFLAGS@ -ltoxdns -ltoxencryptsave @NACL_LIBS@ @LIBS@ @MATH_LDFLAGS@ @PTHREAD_LDFLAGS@
+Libs: @NACL_OBJECTS_PKGCONFIG@ -L${libdir} -ltoxcore @NACL_LDFLAGS@ -ltoxencryptsave @NACL_LIBS@ @LIBS@ @MATH_LDFLAGS@ @PTHREAD_LDFLAGS@
 Cflags: -I${includedir}
diff --git a/other/astyle/README.md b/other/astyle/README.md
index 9ce34b8e..e86cc40f 100644
--- a/other/astyle/README.md
+++ b/other/astyle/README.md
@@ -8,7 +8,7 @@ This directory can house various tools and utilities.
 
 Run from ``toxcore`` directory:
 ```bash
-astyle --options=./other/astyle/astylerc ./toxcore/*.c ./toxcore/*.h ./toxdns/*.c ./toxdns/*.h ./testing/*.c ./toxav/*.c ./toxav/*.h ./other/*.c ./other/bootstrap_daemon/*.c ./toxencryptsave/*.c ./toxencryptsave/*.h ./auto_tests/*.c
+astyle --options=./other/astyle/astylerc ./toxcore/*.c ./toxcore/*.h ./testing/*.c ./toxav/*.c ./toxav/*.h ./other/*.c ./other/bootstrap_daemon/*.c ./toxencryptsave/*.c ./toxencryptsave/*.h ./auto_tests/*.c
 ```
 
 ### For selected file
diff --git a/testing/Makefile.inc b/testing/Makefile.inc
index fda99a89..8f24b44f 100644
--- a/testing/Makefile.inc
+++ b/testing/Makefile.inc
@@ -23,8 +23,7 @@ endif
 if BUILD_TESTING
 
 noinst_PROGRAMS +=      DHT_test \
-                        Messenger_test \
-                        dns3_test
+                        Messenger_test
 
 DHT_test_SOURCES =      ../testing/DHT_test.c
 
@@ -56,23 +55,6 @@ Messenger_test_LDADD =  $(LIBSODIUM_LDFLAGS) \
 
 
 
-dns3_test_SOURCES = \
-                        ../testing/dns3_test.c
-
-dns3_test_CFLAGS = \
-                        $(LIBSODIUM_CFLAGS) \
-                        $(NACL_CFLAGS)
-
-dns3_test_LDADD = \
-                        $(LIBSODIUM_LDFLAGS) \
-                        $(NACL_LDFLAGS) \
-                        libtoxdns.la \
-                        libtoxcore.la \
-                        $(LIBSODIUM_LIBS) \
-                        $(NACL_OBJECTS) \
-                        $(NACL_LIBS) \
-                        $(WINSOCK2_LIBS)
-
 if !WIN32
 
 noinst_PROGRAMS +=      tox_sync
diff --git a/testing/dns3_test.c b/testing/dns3_test.c
deleted file mode 100644
index 0df7ace2..00000000
--- a/testing/dns3_test.c
+++ /dev/null
@@ -1,106 +0,0 @@
-#include "../toxcore/network.h"
-#include "../toxcore/tox.h"
-#include "../toxdns/toxdns.h"
-#include "misc_tools.c"
-
-static uint32_t create_packet(uint8_t *packet, uint8_t *string, uint8_t str_len, uint8_t id)
-{
-    memset(packet, 0, str_len + 13 + 16);
-    packet[0] = id;
-    packet[1] = rand();
-    packet[5] = 1;
-    packet[11] = 1;
-    packet[12] = '.';
-    memcpy(packet + 13, string, str_len);
-    uint32_t i, c = 0;
-
-    for (i = str_len + 12; i != 11; --i) {
-        if (packet[i] == '.') {
-            packet[i] = c;
-            c = 0;
-        } else {
-            ++c;
-        }
-    }
-
-    packet[str_len + 13 + 2] = 16;
-    packet[str_len + 13 + 4] = 1;
-    packet[str_len + 13 + 7] = 0x29;
-    packet[str_len + 13 + 8] = 16;
-    packet[str_len + 13 + 12] = 0x80;
-    return str_len + 13 + 16;
-}
-
-int main(int argc, char *argv[])
-{
-    if (argc < 4) {
-        printf("Usage: %s domain domain_public_key queried_username\nEX: %s utox.org D3154F65D28A5B41A05D4AC7E4B39C6B1C233CC857FB365C56E8392737462A12 username\n",
-               argv[0], argv[0]);
-        exit(0);
-    }
-
-    IP ip = {0};
-    ip.family = TOX_AF_INET;
-    Socket sock = net_socket(ip.family, TOX_SOCK_DGRAM, TOX_PROTO_UDP);
-
-    if (!sock_valid(sock)) {
-        return -1;
-    }
-
-    if (!addr_resolve_or_parse_ip(argv[1], &ip, 0)) {
-        return -1;
-    }
-
-    uint32_t request_id;
-    uint8_t string[1024] = {0};
-    void *d = tox_dns3_new(hex_string_to_bin(argv[2]));
-    int len = tox_generate_dns3_string(d, string + 1, sizeof(string) - 1, &request_id, (uint8_t *)argv[3], strlen(argv[3]));
-
-    if (len == -1) {
-        return -1;
-    }
-
-    string[0] = '_';
-    memcpy(string + len + 1, "._tox.", sizeof("._tox."));
-    memcpy((char *)(string + len + 1 + sizeof("._tox.") - 1), argv[1], strlen(argv[1]));
-    uint8_t packet[512];
-    uint8_t id = rand();
-    uint32_t p_len = create_packet(packet, string, strlen((char *)string), id);
-
-    IP_Port ip_port;
-    ip_port.port = 53;
-    ip_port.ip = ip;
-
-    if (net_sendto_ip4(sock, (char *)packet, p_len, ip_port) != p_len) {
-        return -1;
-    }
-
-    uint8_t buffer[512] = {0};
-    int r_len = recv(sock, (char *)buffer, sizeof(buffer), 0);
-
-    if (r_len < (int)p_len) {
-        return -1;
-    }
-
-    unsigned int i;
-
-    for (i = r_len - 1; i != 0 && buffer[i] != '='; --i) {
-        ;
-    }
-
-    uint8_t tox_id[TOX_ADDRESS_SIZE];
-
-    if (tox_decrypt_dns3_TXT(d, tox_id, buffer + i + 1, r_len - (i + 1), request_id) != 0) {
-        return -1;
-    }
-
-    printf("The Tox id for username %s is:\n", argv[3]);
-
-    //unsigned int i;
-    for (i = 0; i < TOX_ADDRESS_SIZE; ++i) {
-        printf("%02hhX", tox_id[i]);
-    }
-
-    printf("\n");
-    return 0;
-}
diff --git a/toxcore/network.c b/toxcore/network.c
index 5c43bf57..7587826b 100644
--- a/toxcore/network.c
+++ b/toxcore/network.c
@@ -1411,20 +1411,6 @@ Socket net_socket(int domain, int type, int protocol)
     return socket(platform_domain, platform_type, platform_prot);
 }
 
-/* TODO: Remove, when tox DNS support will be removed.
- * Used only by dns3_test.c
- */
-size_t net_sendto_ip4(Socket sock, const char *buf, size_t n, IP_Port ip_port)
-{
-    struct sockaddr_in target;
-    size_t addrsize = sizeof(target);
-    target.sin_family = make_family(ip_port.ip.family);
-    target.sin_port = net_htons(ip_port.port);
-    fill_addr4(ip_port.ip.ip4, &target.sin_addr);
-
-    return (size_t)sendto(sock, buf, n, 0, (struct sockaddr *)&target, addrsize);
-}
-
 uint32_t net_htonl(uint32_t hostlong)
 {
     return htonl(hostlong);
diff --git a/toxcore/network.h b/toxcore/network.h
index 0b9da5a4..41d1307a 100644
--- a/toxcore/network.h
+++ b/toxcore/network.h
@@ -403,8 +403,6 @@ void net_freeipport(IP_Port *ip_ports);
  */
 int bind_to_port(Socket sock, int family, uint16_t port);
 
-size_t net_sendto_ip4(Socket sock, const char *buf, size_t n, IP_Port ip_port);
-
 /* Initialize networking.
  * bind to ip and port.
  * ip must be in network order EX: 127.0.0.1 = (7F000001).
diff --git a/toxdns/Makefile.inc b/toxdns/Makefile.inc
deleted file mode 100644
index 5b7c0123..00000000
--- a/toxdns/Makefile.inc
+++ /dev/null
@@ -1,35 +0,0 @@
-lib_LTLIBRARIES += libtoxdns.la
-
-libtoxdns_la_include_HEADERS = \
-                        ../toxdns/toxdns.h
-
-libtoxdns_la_includedir = $(includedir)/tox
-
-libtoxdns_la_SOURCES =  ../toxdns/toxdns.h \
-                        ../toxdns/toxdns.c
-
-libtoxdns_la_CFLAGS =   -I$(top_srcdir) \
-                        -I$(top_srcdir)/toxcore \
-                        $(LIBSODIUM_CFLAGS) \
-                        $(NACL_CFLAGS) \
-                        $(PTHREAD_CFLAGS)
-
-libtoxdns_la_LDFLAGS =  $(LT_LDFLAGS) \
-                        $(EXTRA_LT_LDFLAGS) \
-                        $(LIBSODIUM_LDFLAGS) \
-                        $(NACL_LDFLAGS) \
-                        $(MATH_LDFLAGS) \
-                        $(RT_LIBS) \
-                        $(WINSOCK2_LIBS)
-
-libtoxdns_la_LIBADD =   $(LIBSODIUM_LIBS) \
-                        $(NACL_OBJECTS) \
-                        $(NAC_LIBS) \
-                        $(PTHREAD_LIBS) \
-                        libtoxcore.la
-
-if SET_SO_VERSION
-
-EXTRA_libtoxdns_la_DEPENDENCIES = ../so.version
-
-endif
diff --git a/toxdns/toxdns.c b/toxdns/toxdns.c
deleted file mode 100644
index 96f3081f..00000000
--- a/toxdns/toxdns.c
+++ /dev/null
@@ -1,243 +0,0 @@
-/*
- * Tox secure username DNS toxid resolving functions.
- */
-
-/*
- * Copyright © 2016-2017 The TokTok team.
- * Copyright © 2013 Tox project.
- *
- * This file is part of Tox, the free peer to peer instant messenger.
- *
- * 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/>.
- */
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
-
-#include "../toxcore/Messenger.h"
-#include "../toxcore/logger.h"
-#include "toxdns.h"
-
-static const char base32[32] = {
-    'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
-    'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
-    '0', '1', '2', '3', '4', '5',
-};
-
-#define _encode(a, b, c) \
-{ \
-    uint8_t _i = 0; \
-    while (_i != c) { \
-        *a++ = base32[((b[0] >> bits) | (b[1] << (8 - bits))) & 0x1F]; \
-        bits += 5; \
-        if(bits >= 8) { \
-            bits -= 8; \
-            b++; \
-            _i++; \
-        } \
-    } \
-}
-
-typedef struct {
-    uint8_t temp_pk[CRYPTO_PUBLIC_KEY_SIZE];
-    uint8_t temp_sk[CRYPTO_SECRET_KEY_SIZE];
-    uint8_t server_public_key[CRYPTO_PUBLIC_KEY_SIZE];
-    uint8_t shared_key[CRYPTO_SYMMETRIC_KEY_SIZE];
-    uint32_t nonce;
-    uint32_t nonce_start;
-} DNS_Object;
-
-static void dns_new_temp_keys(DNS_Object *d)
-{
-    d->nonce = d->nonce_start = random_int();
-    crypto_new_keypair(d->temp_pk, d->temp_sk);
-    encrypt_precompute(d->server_public_key, d->temp_sk, d->shared_key);
-}
-
-/* Create a new tox_dns3 object for server with server_public_key.
- *
- * return Null on failure.
- * return pointer object on success.
- */
-void *tox_dns3_new(uint8_t *server_public_key)
-{
-    DNS_Object *d = (DNS_Object *)malloc(sizeof(DNS_Object));
-
-    if (d == NULL) {
-        return NULL;
-    }
-
-    memcpy(d->server_public_key, server_public_key, CRYPTO_PUBLIC_KEY_SIZE);
-    dns_new_temp_keys(d);
-    return d;
-}
-
-/* Destroy the tox dns3 object.
- */
-void tox_dns3_kill(void *dns3_object)
-{
-    memset(dns3_object, 0, sizeof(DNS_Object));
-    free(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 success.
- * 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)
-{
-#define DOT_INTERVAL (6 * 5)
-    int base = (sizeof(uint32_t) + CRYPTO_PUBLIC_KEY_SIZE + name_len + CRYPTO_MAC_SIZE);
-    int end_len = ((base * 8) / 5) + (base / DOT_INTERVAL) + !!(base % 5);
-    end_len -= !(base % DOT_INTERVAL);
-
-    if (end_len > string_max_len) {
-        return -1;
-    }
-
-    DNS_Object *d = (DNS_Object *)dns3_object;
-    uint8_t buffer[1024];
-    uint8_t nonce[CRYPTO_NONCE_SIZE] = {0};
-    memcpy(nonce, &d->nonce, sizeof(uint32_t));
-    memcpy(buffer, &d->nonce, sizeof(uint32_t));
-    memcpy(buffer + sizeof(uint32_t), d->temp_pk, CRYPTO_PUBLIC_KEY_SIZE);
-    int len = encrypt_data_symmetric(d->shared_key, nonce, name, name_len,
-                                     buffer + sizeof(uint32_t) + CRYPTO_PUBLIC_KEY_SIZE);
-
-    if (len == -1) {
-        return -1;
-    }
-
-    int total_len = len + sizeof(uint32_t) + CRYPTO_PUBLIC_KEY_SIZE;
-    uint8_t *buff = buffer, *old_str = string;
-    buffer[total_len] = 0;
-    uint8_t bits = 0;
-    int i;
-
-    for (i = !(total_len % DOT_INTERVAL); i < (total_len / DOT_INTERVAL); ++i) {
-        _encode(string, buff, DOT_INTERVAL);
-        *string = '.';
-        ++string;
-    }
-
-    int left = total_len - (buff - buffer);
-    _encode(string, buff, left);
-#undef DOT_INTERVAL
-    *request_id = d->nonce;
-    ++d->nonce;
-
-    if (d->nonce == d->nonce_start) {
-        dns_new_temp_keys(d);
-    }
-
-    if (end_len != string - old_str) {
-        // TODO(iphydf): This currently has no access to a logger.
-        LOGGER_ERROR(NULL, "tox_generate_dns3_string Fail, %u != %lu\n", end_len, string - old_str);
-        return -1;
-    }
-
-    return string - old_str;
-}
-
-
-static int decode(uint8_t *dest, uint8_t *src)
-{
-    uint8_t *p = src, *op = dest, bits = 0;
-    *op = 0;
-
-    while (*p) {
-        uint8_t ch = *p++;
-
-        if ('A' <= ch && ch <= 'Z') {
-            ch = ch - 'A';
-        } else if ('a' <= ch && ch <= 'z') {
-            ch = ch - 'a';
-        } else if ('0' <= ch && ch <= '5') {
-            ch = ch - '0' + 26;
-        } else {
-            return - 1;
-        }
-
-        *op |= (ch << bits);
-        bits += 5;
-
-        if (bits >= 8) {
-            bits -= 8;
-            ++op;
-            *op = (ch >> (5 - bits));
-        }
-    }
-
-    return op - dest;
-}
-
-/* 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)
-{
-    DNS_Object *d = (DNS_Object *)dns3_object;
-
-    if (id_record_len != 87) {
-        return -1;
-    }
-
-#if 0
-
-    if (id_record_len > 255 || id_record_len <= (sizeof(uint32_t) + CRYPTO_MAC_SIZE)) {
-        return -1;
-    }
-
-#endif
-
-    VLA(uint8_t, id_record_null, id_record_len + 1);
-    memcpy(id_record_null, id_record, id_record_len);
-    id_record_null[id_record_len] = 0;
-    VLA(uint8_t, data, id_record_len);
-    int length = decode(data, id_record_null);
-
-    if (length == -1) {
-        return -1;
-    }
-
-    uint8_t nonce[CRYPTO_NONCE_SIZE] = {0};
-    memcpy(nonce, &request_id, sizeof(uint32_t));
-    nonce[sizeof(uint32_t)] = 1;
-    int len = decrypt_data_symmetric(d->shared_key, nonce, data, length, tox_id);
-
-    if (len != FRIEND_ADDRESS_SIZE) {
-        return -1;
-    }
-
-    return 0;
-}
diff --git a/toxdns/toxdns.h b/toxdns/toxdns.h
deleted file mode 100644
index b280925e..00000000
--- a/toxdns/toxdns.h
+++ /dev/null
@@ -1,96 +0,0 @@
-/*
- * Tox secure username DNS toxid resolving functions.
- */
-
-/*
- * Copyright © 2016-2017 The TokTok team.
- * Copyright © 2014 Tox project.
- *
- * This file is part of Tox, the free peer to peer instant messenger.
- *
- * 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
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#include <stdint.h>
-
-/* Clients are encouraged to set this as the maximum length names can have. */
-#define TOXDNS_MAX_RECOMMENDED_NAME_LENGTH 32
-
-/* 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 success.
- * 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);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif