/* Is IP a local ip or not. */
bool Local_ip(IP ip)
{
if (ip.family == AF_INET) {
IP4 ip4 = ip.ip4;
/* Loopback. */
if (ip4.uint8[0] == 127) {
return 1;
}
} else {
/* embedded IPv4-in-IPv6 */
if (IPV6_IPV4_IN_V6(ip.ip6)) {
IP ip4;
ip4.family = AF_INET;
ip4.ip4.uint32 = ip.ip6.uint32[3];
return Local_ip(ip4);
}
/* localhost in IPv6 (::1) */
if (ip.ip6.uint64[0] == 0 && ip.ip6.uint32[2] == 0 && ip.ip6.uint32[3] == htonl(1)) {
return 1;
}
}
return 0;
}
/* Add a TCP relay associated to the friend.
*
* return -1 on failure.
* return 0 on success.
*/
int friend_add_tcp_relay(Friend_Connections *fr_c, int friendcon_id, IP_Port ip_port, const uint8_t *public_key)
{
Friend_Conn *friend_con = get_conn(fr_c, friendcon_id);
if (!friend_con)
return -1;
/* Local ip and same pk means that they are hosting a TCP relay. */
if (Local_ip(ip_port.ip) && public_key_cmp(friend_con->dht_temp_pk, public_key) == 0) {
if (friend_con->dht_ip_port.ip.family != 0) {
ip_port.ip = friend_con->dht_ip_port.ip;
} else {
friend_con->hosting_tcp_relay = 0;
}
}
unsigned int i;
uint16_t index = friend_con->tcp_relay_counter % FRIEND_MAX_STORED_TCP_RELAYS;
for (i = 0; i < FRIEND_MAX_STORED_TCP_RELAYS; ++i) {
if (friend_con->tcp_relays[i].ip_port.ip.family != 0
&& public_key_cmp(friend_con->tcp_relays[i].public_key, public_key) == 0) {
memset(&friend_con->tcp_relays[i], 0, sizeof(Node_format));
}
}
friend_con->tcp_relays[index].ip_port = ip_port;
memcpy(friend_con->tcp_relays[index].public_key, public_key, crypto_box_PUBLICKEYBYTES);
++friend_con->tcp_relay_counter;
return add_tcp_relay_peer(fr_c->net_crypto, friend_con->crypt_connection_id, ip_port, public_key);
}
/* return 0 if ip is a LAN ip.
* return -1 if it is not.
*/
int LAN_ip(IP ip)
{
if (Local_ip(ip)) {
return 0;
}
if (ip.family == AF_INET) {
IP4 ip4 = ip.ip4;
/* 10.0.0.0 to 10.255.255.255 range. */
if (ip4.uint8[0] == 10) {
return 0;
}
/* 172.16.0.0 to 172.31.255.255 range. */
if (ip4.uint8[0] == 172 && ip4.uint8[1] >= 16 && ip4.uint8[1] <= 31) {
return 0;
}
/* 192.168.0.0 to 192.168.255.255 range. */
if (ip4.uint8[0] == 192 && ip4.uint8[1] == 168) {
return 0;
}
/* 169.254.1.0 to 169.254.254.255 range. */
if (ip4.uint8[0] == 169 && ip4.uint8[1] == 254 && ip4.uint8[2] != 0
&& ip4.uint8[2] != 255) {
return 0;
}
/* RFC 6598: 100.64.0.0 to 100.127.255.255 (100.64.0.0/10)
* (shared address space to stack another layer of NAT) */
if ((ip4.uint8[0] == 100) && ((ip4.uint8[1] & 0xC0) == 0x40)) {
return 0;
}
} else if (ip.family == AF_INET6) {
/* autogenerated for each interface: FE80::* (up to FEBF::*)
FF02::1 is - according to RFC 4291 - multicast all-nodes link-local */
if (((ip.ip6.uint8[0] == 0xFF) && (ip.ip6.uint8[1] < 3) && (ip.ip6.uint8[15] == 1)) ||
((ip.ip6.uint8[0] == 0xFE) && ((ip.ip6.uint8[1] & 0xC0) == 0x80))) {
return 0;
}
/* embedded IPv4-in-IPv6 */
if (IPV6_IPV4_IN_V6(ip.ip6)) {
IP ip4;
ip4.family = AF_INET;
ip4.ip4.uint32 = ip.ip6.uint32[3];
return LAN_ip(ip4);
}
}
return -1;
}
