Exemplo n.º 1
0
peer *
netdbClosestParent(request_t * request)
{
#if USE_ICMP
    peer *p = NULL;
    netdbEntry *n;
    const ipcache_addrs *ia;
    net_db_peer *h;
    int i;
    n = netdbLookupHost(request->host);
    if (NULL == n) {
        /* try IP addr */
        ia = ipcache_gethostbyname(request->host, 0);
        if (NULL != ia)
            n = netdbLookupAddr(ia->in_addrs[ia->cur]);
    }
    if (NULL == n)
        return NULL;
    if (0 == n->n_peers)
        return NULL;
    n->last_use_time = squid_curtime;
    /*
     * Find the parent with the least RTT to the origin server.
     * Make sure we don't return a parent who is farther away than
     * we are.  Note, the n->peers list is pre-sorted by RTT.
     */
    for (i = 0; i < n->n_peers; i++) {
        h = &n->peers[i];
        if (n->rtt > 0)
            if (n->rtt < h->rtt)
                break;
        p = peerFindByName(h->peername);
        if (NULL == p)		/* not found */
            continue;
        if (neighborType(p, request) != PEER_PARENT)
            continue;
        if (!peerHTTPOkay(p, request))	/* not allowed */
            continue;
        return p;
    }
#endif
    return NULL;
}
Exemplo n.º 2
0
int
neighborsUdpPing(request_t * request,
    StoreEntry * entry,
    IRCB * callback,
    void *callback_data,
    int *exprep,
    int *timeout)
{
    const char *url = storeUrl(entry);
    MemObject *mem = entry->mem_obj;
    peer *p = NULL;
    int i;
    int reqnum = 0;
    int flags;
    icp_common_t *query;
    int queries_sent = 0;
    int peers_pinged = 0;
    int parent_timeout = 0, parent_exprep = 0;
    int sibling_timeout = 0, sibling_exprep = 0;
    int mcast_timeout = 0, mcast_exprep = 0;

    if (Config.peers == NULL)
	return 0;
    if (theOutIcpConnection < 0)
	fatal("neighborsUdpPing: There is no ICP socket!");
    assert(entry->swap_status == SWAPOUT_NONE);
    mem->start_ping = current_time;
    mem->ping_reply_callback = callback;
    mem->ircb_data = callback_data;
    reqnum = icpSetCacheKey(entry->hash.key);
    for (i = 0, p = first_ping; i++ < Config.npeers; p = p->next) {
	if (p == NULL)
	    p = Config.peers;
	debug(15, 5) ("neighborsUdpPing: Peer %s\n", p->name);
	if (!peerWouldBePinged(p, request))
	    continue;		/* next peer */
	peers_pinged++;
	debug(15, 4) ("neighborsUdpPing: pinging peer %s for '%s'\n",
	    p->name, url);
	if (p->type == PEER_MULTICAST)
	    mcastSetTtl(theOutIcpConnection, p->mcast.ttl);
	debug(15, 3) ("neighborsUdpPing: key = '%s'\n", storeKeyText(entry->hash.key));
	debug(15, 3) ("neighborsUdpPing: reqnum = %d\n", reqnum);

#if USE_HTCP
	if (p->options.htcp && !p->options.htcp_only_clr) {
	    debug(15, 3) ("neighborsUdpPing: sending HTCP query\n");
	    htcpQuery(entry, request, p);
	} else
#endif
	if (p->icp.port == echo_port) {
	    debug(15, 4) ("neighborsUdpPing: Looks like a dumb cache, send DECHO ping\n");
	    echo_hdr.reqnum = reqnum;
	    query = icpCreateMessage(ICP_DECHO, 0, url, reqnum, 0);
	    icpUdpSend(theOutIcpConnection,
		&p->in_addr,
		query,
		LOG_ICP_QUERY,
		0);
	} else {
	    flags = 0;
	    if (Config.onoff.query_icmp)
		if (p->icp.version == ICP_VERSION_2)
		    flags |= ICP_FLAG_SRC_RTT;
	    query = icpCreateMessage(ICP_QUERY, flags, url, reqnum, 0);
	    icpUdpSend(theOutIcpConnection,
		&p->in_addr,
		query,
		LOG_ICP_QUERY,
		0);
	}
	queries_sent++;

	p->stats.pings_sent++;
	if (p->type == PEER_MULTICAST) {
	    mcast_exprep += p->mcast.n_replies_expected;
	    mcast_timeout += (p->stats.rtt * p->mcast.n_replies_expected);
	} else if (neighborUp(p)) {
	    /* its alive, expect a reply from it */
	    if (neighborType(p, request) == PEER_PARENT) {
		parent_exprep++;
		parent_timeout += p->stats.rtt;
	    } else {
		sibling_exprep++;
		sibling_timeout += p->stats.rtt;
	    }
	} else {
	    /* Neighbor is dead; ping it anyway, but don't expect a reply */
	    /* log it once at the threshold */
	    if (p->stats.logged_state == PEER_ALIVE) {
		debug(15, 1) ("Detected DEAD %s: %s\n",
		    neighborTypeStr(p), p->name);
		p->stats.logged_state = PEER_DEAD;
	    }
	}
	p->stats.last_query = squid_curtime;
	/*
	 * keep probe_start == 0 for a multicast peer,
	 * so neighborUp() never says this peer is dead.
	 */
	if ((p->type != PEER_MULTICAST) && (p->stats.probe_start == 0))
	    p->stats.probe_start = squid_curtime;
    }
    if ((first_ping = first_ping->next) == NULL)
	first_ping = Config.peers;

#if ALLOW_SOURCE_PING
    /* only do source_ping if we have neighbors */
    if (Config.npeers) {
	const ipcache_addrs *ia = NULL;
	struct sockaddr_in to_addr;
	char *host = request->host;
	if (!Config.onoff.source_ping) {
	    debug(15, 6) ("neighborsUdpPing: Source Ping is disabled.\n");
	} else if ((ia = ipcache_gethostbyname(host, 0))) {
	    debug(15, 6) ("neighborsUdpPing: Source Ping: to %s for '%s'\n",
		host, url);
	    echo_hdr.reqnum = reqnum;
	    if (icmp_sock != -1) {
		icmpSourcePing(ia->in_addrs[ia->cur], &echo_hdr, url);
	    } else {
		to_addr.sin_family = AF_INET;
		to_addr.sin_addr = ia->in_addrs[ia->cur];
		to_addr.sin_port = htons(echo_port);
		query = icpCreateMessage(ICP_SECHO, 0, url, reqnum, 0);
		icpUdpSend(theOutIcpConnection,
		    &to_addr,
		    query,
		    LOG_ICP_QUERY,
		    0);
	    }
	} else {
	    debug(15, 6) ("neighborsUdpPing: Source Ping: unknown host: %s\n",
		host);
	}
    }
#endif
    /*
     * How many replies to expect?
     */
    *exprep = parent_exprep + sibling_exprep + mcast_exprep;

    /*
     * If there is a configured timeout, use it
     */
    if (Config.Timeout.icp_query)
	*timeout = Config.Timeout.icp_query;
    else {
	if (*exprep > 0) {
	    if (parent_exprep)
		*timeout = 2 * parent_timeout / parent_exprep;
	    else if (mcast_exprep)
		*timeout = 2 * mcast_timeout / mcast_exprep;
	    else
		*timeout = 2 * sibling_timeout / sibling_exprep;
	} else
	    *timeout = 2000;	/* 2 seconds */
	if (Config.Timeout.icp_query_max)
	    if (*timeout > Config.Timeout.icp_query_max)
		*timeout = Config.Timeout.icp_query_max;

	if (*timeout < Config.Timeout.icp_query_min)
	    *timeout = Config.Timeout.icp_query_min;
    }
    return peers_pinged;
}