/* LAN_discovery.c * * LAN discovery implementation. * * Copyright (C) 2013 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 . * */ #include "LAN_discovery.h" /*Return the broadcast ip TODO: make it return the real one, not the 255.255.255.255 one.*/ IP broadcast_ip() { IP ip; ip.i = ~0; return ip; } /*return 0 if ip is a LAN ip return -1 if it is not */ int LAN_ip(IP ip) { if (ip.c[0] == 127)/* Loopback */ return 0; if (ip.c[0] == 10)/* 10.0.0.0 to 10.255.255.255 range */ return 0; if (ip.c[0] == 172 && ip.c[1] >= 16 && ip.c[1] <= 31)/* 172.16.0.0 to 172.31.255.255 range */ return 0; if (ip.c[0] == 192 && ip.c[1] == 168) /* 192.168.0.0 to 192.168.255.255 range */ return 0; if (ip.c[0] == 169 && ip.c[1] == 254 && ip.c[2] != 0 && ip.c[2] != 255)/* 169.254.1.0 to 169.254.254.255 range */ return 0; return -1; } int handle_LANdiscovery(uint8_t *packet, uint32_t length, IP_Port source) { if (LAN_ip(source.ip) == -1) return 1; if (length != crypto_box_PUBLICKEYBYTES + 1) return 1; DHT_bootstrap(source, packet + 1); return 0; } int send_LANdiscovery(uint16_t port) { uint8_t data[crypto_box_PUBLICKEYBYTES + 1]; data[0] = 32; memcpy(data + 1, self_public_key, crypto_box_PUBLICKEYBYTES); IP_Port ip_port = {broadcast_ip(), port}; return sendpacket(ip_port, data, 1 + crypto_box_PUBLICKEYBYTES); } int LANdiscovery_handlepacket(uint8_t *packet, uint32_t length, IP_Port source) { if (packet[0] == 32) return handle_LANdiscovery(packet, length, source); return 1; }