/**
* Send a Gnutella ping to the specified host via UDP, using the
* specified MUID.
*/
void
udp_connect_back(const host_addr_t addr, uint16 port, const struct guid *muid)
{
if (udp_send_ping(muid, addr, port, FALSE)) {
if (GNET_PROPERTY(udp_debug) > 19)
g_debug("UDP queued connect-back PING #%s to %s\n",
guid_hex_str(muid), host_addr_port_to_string(addr, port));
}
}
/**
* Send an UDP ping to the host cache.
*/
static void
uhc_send_ping(void)
{
g_assert(uhc_connecting);
guid_random_muid(&uhc_ctx.muid);
if (udp_send_ping(&uhc_ctx.muid, uhc_ctx.addr, uhc_ctx.port, TRUE)) {
if (GNET_PROPERTY(bootstrap_debug) || GNET_PROPERTY(log_uhc_pings_tx)) {
g_debug("BOOT sent UDP SCP ping #%s to %s:%u",
guid_hex_str(&uhc_ctx.muid), uhc_ctx.host, uhc_ctx.port);
}
/*
* Give GUI feedback.
*/
{
char msg[256];
str_bprintf(msg, sizeof msg,
_("Sent ping to UDP host cache %s:%u"),
uhc_ctx.host, uhc_ctx.port);
gcu_statusbar_message(msg);
}
/*
* Arm a timer to see whether we should not try to ping another
* host cache if we don't get a timely reply.
*/
g_assert(uhc_ctx.timeout_ev == NULL);
uhc_ctx.timeout_ev = cq_main_insert(UHC_TIMEOUT,
uhc_ping_timeout, NULL);
} else {
g_warning("BOOT failed to send UDP SCP to %s",
host_addr_port_to_string(uhc_ctx.addr, uhc_ctx.port));
uhc_try_next();
}
}
/**
* Periodic host heartbeat timer.
*/
void
host_timer(void)
{
guint count;
int missing;
host_addr_t addr;
guint16 port;
host_type_t htype;
guint max_nodes;
gboolean empty_cache = FALSE;
if (in_shutdown || !GNET_PROPERTY(online_mode))
return;
max_nodes = settings_is_leaf() ?
GNET_PROPERTY(max_ultrapeers) : GNET_PROPERTY(max_connections);
count = node_count(); /* Established + connecting */
missing = node_keep_missing();
if (GNET_PROPERTY(host_debug) > 1)
g_debug("host_timer - count %u, missing %u", count, missing);
/*
* If we are not connected to the Internet, apparently, make sure to
* connect to at most one host, to avoid using all our hostcache.
* Also, we don't connect each time we are called.
*/
if (!GNET_PROPERTY(is_inet_connected)) {
static time_t last_try;
if (last_try && delta_time(tm_time(), last_try) < 20)
return;
last_try = tm_time();
if (GNET_PROPERTY(host_debug))
g_debug("host_timer - not connected, trying to connect");
}
/*
* Allow more outgoing connections than the maximum amount of
* established Gnet connection we can maintain, but not more
* than quick_connect_pool_size This is the "greedy mode".
*/
if (count >= GNET_PROPERTY(quick_connect_pool_size)) {
if (GNET_PROPERTY(host_debug) > 1)
g_debug("host_timer - count %u >= pool size %u",
count, GNET_PROPERTY(quick_connect_pool_size));
return;
}
if (count < max_nodes)
missing -= whitelist_connect();
/*
* If we are under the number of connections wanted, we add hosts
* to the connection list
*/
htype = HOST_ULTRA;
if (
settings_is_ultra() &&
GNET_PROPERTY(node_normal_count) < GNET_PROPERTY(normal_connections) &&
GNET_PROPERTY(node_ultra_count) >=
(GNET_PROPERTY(up_connections) - GNET_PROPERTY(normal_connections))
) {
htype = HOST_ANY;
}
if (hcache_size(htype) == 0)
htype = HOST_ANY;
if (hcache_size(htype) == 0)
empty_cache = TRUE;
if (GNET_PROPERTY(host_debug) && missing > 0)
g_debug("host_timer - missing %d host%s%s",
missing, missing == 1 ? "" : "s",
empty_cache ? " [empty caches]" : "");
if (!GNET_PROPERTY(stop_host_get)) {
if (missing > 0) {
static time_t last_try;
unsigned fan, max_pool, to_add;
max_pool = MAX(GNET_PROPERTY(quick_connect_pool_size), max_nodes);
fan = (missing * GNET_PROPERTY(quick_connect_pool_size))/ max_pool;
fan = MAX(1, fan);
to_add = GNET_PROPERTY(is_inet_connected) ? fan : (guint) missing;
/*
* Every so many calls, attempt to ping all our neighbours to
* get fresh pongs, in case our host cache is not containing
* sufficiently fresh hosts and we keep getting connection failures.
*/
if (
0 == last_try ||
delta_time(tm_time(), last_try) >= HOST_PINGING_PERIOD
) {
ping_all_neighbours();
last_try = tm_time();
}
/*
* Make sure that we never use more connections then the
* quick pool or the maximum number of hosts allow.
*/
if (to_add + count > max_pool)
to_add = max_pool - count;
if (GNET_PROPERTY(host_debug) > 2) {
g_debug("host_timer - connecting - "
"add: %d fan:%d miss:%d max_hosts:%d count:%d extra:%d",
to_add, fan, missing, max_nodes, count,
GNET_PROPERTY(quick_connect_pool_size));
}
missing = to_add;
if (missing > 0 && (0 == connected_nodes() || host_low_on_pongs)) {
gnet_host_t host[HOST_DHT_MAX];
int hcount;
int i;
hcount = dht_fill_random(host,
MIN(UNSIGNED(missing), G_N_ELEMENTS(host)));
missing -= hcount;
for (i = 0; i < hcount; i++) {
addr = gnet_host_get_addr(&host[i]);
port = gnet_host_get_port(&host[i]);
if (!hcache_node_is_bad(addr)) {
if (GNET_PROPERTY(host_debug) > 3) {
g_debug("host_timer - UHC pinging and connecting "
"to DHT node at %s",
host_addr_port_to_string(addr, port));
}
/* Try to use the host as an UHC before connecting */
udp_send_ping(NULL, addr, port, TRUE);
if (!host_gnutella_connect(addr, port)) {
missing++; /* Did not use entry */
}
} else {
missing++; /* Did not use entry */
}
}
}
while (hcache_size(htype) && missing-- > 0) {
if (hcache_get_caught(htype, &addr, &port)) {
if (!(hostiles_check(addr) || hcache_node_is_bad(addr))) {
if (!host_gnutella_connect(addr, port)) {
missing++; /* Did not use entry */
}
} else {
missing++; /* Did not use entry */
}
}
}
if (missing > 0 && (empty_cache || host_cache_allow_bypass())) {
if (!uhc_is_waiting()) {
if (GNET_PROPERTY(host_debug))
g_debug("host_timer - querying UDP host cache");
uhc_get_hosts(); /* Get new hosts from UHCs */
}
}
}
} else if (GNET_PROPERTY(use_netmasks)) {
/* Try to find better hosts */
if (hcache_find_nearby(htype, &addr, &port)) {
if (node_remove_worst(TRUE))
node_add(addr, port, 0);
else
hcache_add_caught(htype, addr, port, "nearby host");
}
}
}
