C++ address类代码示例

static void CountSSMLeave(const address &group, const address &source) {
	address source_addr;
	char tmp[64], tmp2[64];

	GroupMap::iterator g = groupMap.find(group);
	assert(g != groupMap.end());
	source_addr.set_family(source.family());
	source_addr.copy_address(source);
	source_addr.set_port(0);
	SourceMap::iterator s = g->second.find(source_addr);
	assert(s != g->second.end());
	SourceSet::iterator ss = s->second.find(source);
	if (ss == s->second.end()) {
		return;
	}
	if (verbose)
		info("Removing beacon %s from (%s, %s)", source.to_string(tmp, sizeof(tmp)),
		     source_addr.to_string(tmp2, sizeof(tmp2)),
		     group.to_string(tmp2, sizeof(tmp2)));
	s->second.erase(ss);
	if (s->second.empty()) {
		if (verbose)
			info("No more beacons for (%s, %s), leaving group",
			     source_addr.to_string(tmp, sizeof(tmp)),
			     group.to_string(tmp2, sizeof(tmp2)));
		SSMLeave(ssmMcastSock,group, source_addr);
		g->second.erase(s);
	}
	if (g->second.empty()) {
		if (verbose)
			info("No more sources, unregistering group %s, ", group.to_string(tmp, sizeof(tmp)));
		groupMap.erase(g);
	}
}

	int ip_filter::access(address const& addr) const
	{
		if (addr.is_v4())
			return m_filter4.access(addr.to_v4());
		assert(addr.is_v6());
		return m_filter6.access(addr.to_v6());
	}

static void CountSSMJoin(const address &group, const address &source) {
	address source_addr;
	char tmp[64], tmp2[64], tmp3[64];
	
	source_addr.set_family(source.family());
	source_addr.copy_address(source);
	source_addr.set_port(0);
	GroupMap::iterator g = groupMap.find(group);
	if (g == groupMap.end()) {
		if (verbose) 
			info("Registering SSM group %s", group.to_string(tmp, sizeof(tmp)));
		g = groupMap.insert(std::make_pair(group, SourceMap())).first;
	}
	SourceMap::iterator s = g->second.find(source_addr);
	if (s == g->second.end()) {
		if (verbose)
			info("Joining (%s, %s)", source_addr.to_string(tmp, sizeof(tmp)),
			     group.to_string(tmp2, sizeof(tmp2)));
		if (SSMJoin(ssmMcastSock, group, source_addr) < 0) {
			if (verbose)
				info("Join failed, reason: %s", strerror(errno));
			return;
		} else {
			s = g->second.insert(std::make_pair(source_addr, SourceSet())).first;
		}
	} 
	SourceSet::iterator ss = s->second.find(source);
	if (ss == s->second.end()) {
		if (verbose)
			info("Adding beacon %s to (%s, %s)", source.to_string(tmp, sizeof(tmp)),
			     source_addr.to_string(tmp2, sizeof(tmp2)),
			     group.to_string(tmp3, sizeof(tmp3)));
		s->second.insert(source);
	}
}

int send_report(int type) {
	int len;

	len = build_report(buffer, bufferLen, type == SSM_REPORT ? STATS_REPORT : type, true);
	if (len < 0)
		return len;

	int res;

	if (type == SSM_REPORT) {
		if ((res = sendto(mcastSock, buffer, len, 0, ssmProbeAddr.saddr(), ssmProbeAddr.addrlen())) < 0)
			d_log(LOG_DEBUG, "Failed to send SSM report: %s", strerror(errno));
		else
			bytesSent += res;
	} else {
		for (vector<address>::const_iterator i = redist.begin();
				i != redist.end(); ++i) {
			char tmp[64];

			if (verbose)
				d_log(LOG_DEBUG, "Sending Report to %s",
					i->to_string(tmp, sizeof(tmp)));

			if ((res = sendto(mcastSock, buffer, len, 0, i->saddr(),
					i->addrlen())) < 0)
				d_log(LOG_DEBUG, "Failed to send report to %s: %s",
					i->to_string(tmp, sizeof(tmp)), strerror(errno));
			else
				bytesSent += res;
		}
	}

	return 0;
}

	address external_ip::external_address(address const& ip) const
	{
		address ext = m_vote_group[ip.is_v6()].external_address();
#if TORRENT_USE_IPV6
		if (ip.is_v6() && ext == address_v4()) return address_v6();
#endif
		return ext;
	}

// private
hosts::iterator hosts::find(const address& host)
{
    const auto found = [&host](const address& entry)
    {
        return entry.port() == host.port() && entry.ip() == host.ip();
    };

    return std::find_if(buffer_.begin(), buffer_.end(), found);
}

bool address::is_equal(const address &a) const {
	if (stor.ss_family != a.stor.ss_family)
		return false;
	if (stor.ss_family == AF_INET6)
		return memcmp(&v6()->sin6_addr, &a.v6()->sin6_addr, sizeof(in6_addr)) == 0;
	else if (stor.ss_family == AF_INET)
		return v4()->sin_addr.s_addr == a.v4()->sin_addr.s_addr;
	return false;
}

	tcp::endpoint utp_socket_manager::local_endpoint(address const& remote, error_code& ec) const
	{
		tcp::endpoint socket_ep = m_sock.local_endpoint(ec);

		// first enumerate the routes in the routing table
		if (time_now() - m_last_route_update > seconds(60))
		{
			m_last_route_update = time_now();
			error_code ec;
			m_routes = enum_routes(m_sock.get_io_service(), ec);
			if (ec) return socket_ep;
		}

		if (m_routes.empty()) return socket_ep;
		// then find the best match
		ip_route* best = &m_routes[0];
		for (std::vector<ip_route>::iterator i = m_routes.begin()
			, end(m_routes.end()); i != end; ++i)
		{
			if (is_any(i->destination) && i->destination.is_v4() == remote.is_v4())
			{
				best = &*i;
				continue;
			}

			if (match_addr_mask(remote, i->destination, i->netmask))
			{
				best = &*i;
				continue;
			}
		}

		// best now tells us which interface we would send over
		// for this target. Now figure out what the local address
		// is for that interface

		if (time_now() - m_last_if_update > seconds(60))
		{
			m_last_if_update = time_now();
			error_code ec;
			m_interfaces = enum_net_interfaces(m_sock.get_io_service(), ec);
			if (ec) return socket_ep;
		}

		for (std::vector<ip_interface>::iterator i = m_interfaces.begin()
			, end(m_interfaces.end()); i != end; ++i)
		{
			if (i->interface_address.is_v4() != remote.is_v4())
				continue;

			if (strcmp(best->name, i->name) == 0)
				return tcp::endpoint(i->interface_address, socket_ep.port());
		}
		return socket_ep;
	}

bool address::copy_address(const address &source) {
	if (family() != source.family())
		return false;

	if (stor.ss_family == AF_INET6)
		v6()->sin6_addr = source.v6()->sin6_addr;
	else
		v4()->sin_addr = source.v4()->sin_addr;

	return true;
}

static int send_nprobe(const address &addr, uint32_t &seq) {
	int len;

	len = build_probe(buffer, bufferLen, seq, get_time_of_day());
	seq++;

	len = sendto(mcastSock, buffer, len, 0, addr.saddr(), addr.addrlen());
	if (len > 0)
		bytesSent += len;
	return len;
}

	bool in_subnet(address const& addr, ip_interface const& iface)
	{
		if (addr.is_v4() != iface.interface_address.is_v4()) return false;
		// since netmasks seems unreliable for IPv6 interfaces
		// (MacOS X returns AF_INET addresses as bitmasks) assume
		// that any IPv6 address belongs to the subnet of any
		// interface with an IPv6 address
		if (addr.is_v6()) return true;

		return (addr.to_v4().to_ulong() & iface.netmask.to_v4().to_ulong())
			== (iface.interface_address.to_v4().to_ulong() & iface.netmask.to_v4().to_ulong());
	}

		void write_address(address const& a, OutIt& out)
		{
			if (a.is_v4())
			{
				write_uint32(a.to_v4().to_ulong(), out);
			}
			else if (a.is_v6())
			{
				address_v6::bytes_type bytes
					= a.to_v6().to_bytes();
				std::copy(bytes.begin(), bytes.end(), out);
			}
		}

address mask_address(const address& addrIn, uint8_t prefixLen) {
    if (addrIn.is_v4()) {
        prefixLen = std::min<uint8_t>(prefixLen, 32);
        uint32_t mask = get_subnet_mask_v4(prefixLen);
        return address_v4(addrIn.to_v4().to_ulong() & mask);
    }
    struct in6_addr mask;
    struct in6_addr addr6;
    prefixLen = std::min<uint8_t>(prefixLen, 128);
    compute_ipv6_subnet(addrIn.to_v6(), prefixLen, &mask, &addr6);
    address_v6::bytes_type data;
    std::memcpy(data.data(), &addr6, sizeof(addr6));
    return address_v6(data);
}

	void utp_socket_manager::mtu_for_dest(address const& addr, int& link_mtu, int& utp_mtu)
	{

		int mtu = 0;
		if (is_teredo(addr)) mtu = TORRENT_TEREDO_MTU;
		else mtu = TORRENT_ETHERNET_MTU;

#if defined __APPLE__
		// apple has a very strange loopback. It appears you can't
		// send messages of the reported MTU size, and you don't get
		// EWOULDBLOCK either.
		if (is_loopback(addr))
		{
			if (is_teredo(addr)) mtu = TORRENT_TEREDO_MTU;
			else mtu = TORRENT_ETHERNET_MTU;
		}
#endif

		// clamp the MTU within reasonable bounds
		if (mtu < TORRENT_INET_MIN_MTU) mtu = TORRENT_INET_MIN_MTU;
		else if (mtu > TORRENT_INET_MAX_MTU) mtu = TORRENT_INET_MAX_MTU;

		link_mtu = mtu;

		mtu -= TORRENT_UDP_HEADER;

		if (m_sock.get_proxy_settings().type == settings_pack::socks5
			|| m_sock.get_proxy_settings().type == settings_pack::socks5_pw)
		{
			// this is for the IP layer
			address proxy_addr = m_sock.proxy_addr().address();
			if (proxy_addr.is_v4()) mtu -= TORRENT_IPV4_HEADER;
			else mtu -= TORRENT_IPV6_HEADER;

			// this is for the SOCKS layer
			mtu -= TORRENT_SOCKS5_HEADER;

			// the address field in the SOCKS header
			if (addr.is_v4()) mtu -= 4;
			else mtu -= 16;
		}
		else
		{
			if (addr.is_v4()) mtu -= TORRENT_IPV4_HEADER;
			else mtu -= TORRENT_IPV6_HEADER;
		}

		utp_mtu = (std::min)(mtu, restrict_mtu());
	}

    std::string address_to_bytes(address const& a)
    {
#if LIBED2K_USE_IPV6
        if (a.is_v6())
        {
            address_v6::bytes_type b = a.to_v6().to_bytes();
            return std::string((char*)&b[0], b.size());
        }
        else
#endif
        {
            address_v4::bytes_type b = a.to_v4().to_bytes();
            return std::string((char*)&b[0], b.size());
        }
    }