Пример #1
0
/**
 * 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));
	}
}
Пример #2
0
/**
 * 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();
	}
}
Пример #3
0
/**
 * 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");
		}
	}
}