mirror of
https://github.com/irungentoo/toxcore.git
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80 lines
2.2 KiB
C
80 lines
2.2 KiB
C
/* LAN_discovery.c
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*
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* LAN discovery implementation.
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*
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* Copyright (C) 2013 Tox project All Rights Reserved.
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*
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* This file is part of Tox.
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*
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* Tox is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Tox is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Tox. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "LAN_discovery.h"
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/*Return the broadcast ip
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TODO: make it return the real one, not the 255.255.255.255 one.*/
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IP broadcast_ip()
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{
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IP ip;
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ip.i = ~0;
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return ip;
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}
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/*return 0 if ip is a LAN ip
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return -1 if it is not */
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int LAN_ip(IP ip)
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{
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if (ip.c[0] == 127)/* Loopback */
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return 0;
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if (ip.c[0] == 10)/* 10.0.0.0 to 10.255.255.255 range */
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return 0;
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if (ip.c[0] == 172 && ip.c[1] >= 16 && ip.c[1] <= 31)/* 172.16.0.0 to 172.31.255.255 range */
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return 0;
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if (ip.c[0] == 192 && ip.c[1] == 168) /* 192.168.0.0 to 192.168.255.255 range */
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return 0;
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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 */
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return 0;
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return -1;
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}
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int handle_LANdiscovery(uint8_t *packet, uint32_t length, IP_Port source)
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{
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if (LAN_ip(source.ip) == -1)
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return 1;
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if (length != crypto_box_PUBLICKEYBYTES + 1)
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return 1;
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DHT_bootstrap(source, packet + 1);
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return 0;
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}
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int send_LANdiscovery(uint16_t port)
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{
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uint8_t data[crypto_box_PUBLICKEYBYTES + 1];
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data[0] = 32;
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memcpy(data + 1, self_public_key, crypto_box_PUBLICKEYBYTES);
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IP_Port ip_port = {broadcast_ip(), port};
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return sendpacket(ip_port, data, 1 + crypto_box_PUBLICKEYBYTES);
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}
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int LANdiscovery_handlepacket(uint8_t *packet, uint32_t length, IP_Port source)
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{
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if (packet[0] == 32)
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return handle_LANdiscovery(packet, length, source);
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return 1;
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}
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