/**
* Select proper RX layer for semi-reliable UDP traffic.
*
* Source address is checked for hostile hosts in order to enforce a
* total blackout.
*
* @param utp UDP traffic type
* @param from source address
* @param len length of message, for logging only
*
* @return the RX layer if found, NULL if none or the address is hostile.
*/
static rxdrv_t *
udp_get_rx_semi_reliable(enum udp_traffic utp, host_addr_t from, size_t len)
{
unsigned i = 0;
if (hostiles_is_bad(from)) {
if (GNET_PROPERTY(udp_debug)) {
hostiles_flags_t flags = hostiles_check(from);
g_warning("UDP got %s (%zu bytes) from hostile %s (%s) -- dropped",
udp_traffic_to_string(utp), len, host_addr_to_string(from),
hostiles_flags_to_string(flags));
}
gnet_stats_inc_general(GNR_UDP_SR_RX_FROM_HOSTILE_IP);
return NULL; /* Ignore message */
}
switch (host_addr_net(from)) {
case NET_TYPE_IPV4: i = 0; break;
case NET_TYPE_IPV6: i = 1; break;
case NET_TYPE_LOCAL:
case NET_TYPE_NONE:
g_assert_not_reached();
}
return
SEMI_RELIABLE_GTA == utp ? rx_sr_gta[i] :
SEMI_RELIABLE_GND == utp ? rx_sr_gnd[i] :
NULL;
}
/**
* @return whether host's address is a valid DHT value creator.
*/
bool
knode_addr_is_usable(const knode_t *kn)
{
knode_check(kn);
if (!host_address_is_usable(kn->addr))
return FALSE;
if (hostiles_is_bad(kn->addr))
return FALSE;
return TRUE;
}
/**
* @return whether host can be kept as a valid contact
*/
bool
knode_is_usable(const knode_t *kn)
{
knode_check(kn);
if (!host_is_valid(kn->addr, kn->port))
return FALSE;
if (hostiles_is_bad(kn->addr))
return FALSE;
return TRUE;
}
/**
* Tree message iterator to handle "CH" nodes and extract their IP:port.
*/
static void
g2_node_extract_ch(void *data, void *udata)
{
const g2_tree_t *t = data;
(void) udata;
if (0 == strcmp("CH", g2_tree_name(t))) {
const char *payload;
size_t paylen;
payload = g2_tree_node_payload(t, &paylen);
if (10 == paylen) { /* IPv4:port + 32-bit timestamp */
host_addr_t addr = host_addr_peek_ipv4(payload);
uint16 port = peek_le16(&payload[4]);
if (host_is_valid(addr, port) && !hostiles_is_bad(addr))
guess_add_hub(addr, port);
}
}
}
