| /* |
| * Copyright 2004 The WebRTC Project Authors. All rights reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| |
| #include "rtc_base/network.h" |
| |
| #if defined(WEBRTC_POSIX) |
| // linux/if.h can't be included at the same time as the posix sys/if.h, and |
| // it's transitively required by linux/route.h, so include that version on |
| // linux instead of the standard posix one. |
| #if defined(WEBRTC_LINUX) |
| #include <linux/if.h> |
| #include <linux/route.h> |
| #elif !defined(__native_client__) |
| #include <net/if.h> |
| #endif |
| #endif // WEBRTC_POSIX |
| |
| #if defined(WEBRTC_WIN) |
| #include <iphlpapi.h> |
| #include "rtc_base/win32.h" |
| #elif !defined(__native_client__) |
| #include "rtc_base/ifaddrs_converter.h" |
| #endif |
| |
| #include <stdio.h> |
| |
| #include <algorithm> |
| #include <memory> |
| |
| #include "rtc_base/checks.h" |
| #include "rtc_base/logging.h" |
| #include "rtc_base/network_monitor.h" |
| #include "rtc_base/socket.h" // includes something that makes windows happy |
| #include "rtc_base/string_encode.h" |
| #include "rtc_base/string_utils.h" |
| #include "rtc_base/strings/string_builder.h" |
| #include "rtc_base/thread.h" |
| |
| namespace rtc { |
| namespace { |
| |
| const uint32_t kUpdateNetworksMessage = 1; |
| const uint32_t kSignalNetworksMessage = 2; |
| |
| // Fetch list of networks every two seconds. |
| const int kNetworksUpdateIntervalMs = 2000; |
| |
| const int kHighestNetworkPreference = 127; |
| |
| typedef struct { |
| Network* net; |
| std::vector<InterfaceAddress> ips; |
| } AddressList; |
| |
| bool CompareNetworks(const Network* a, const Network* b) { |
| if (a->prefix_length() == b->prefix_length()) { |
| if (a->name() == b->name()) { |
| return a->prefix() < b->prefix(); |
| } |
| } |
| return a->name() < b->name(); |
| } |
| |
| bool SortNetworks(const Network* a, const Network* b) { |
| // Network types will be preferred above everything else while sorting |
| // Networks. |
| |
| // Networks are sorted first by type. |
| if (a->type() != b->type()) { |
| return a->type() < b->type(); |
| } |
| |
| IPAddress ip_a = a->GetBestIP(); |
| IPAddress ip_b = b->GetBestIP(); |
| |
| // After type, networks are sorted by IP address precedence values |
| // from RFC 3484-bis |
| if (IPAddressPrecedence(ip_a) != IPAddressPrecedence(ip_b)) { |
| return IPAddressPrecedence(ip_a) > IPAddressPrecedence(ip_b); |
| } |
| |
| // TODO(mallinath) - Add VPN and Link speed conditions while sorting. |
| |
| // Networks are sorted last by key. |
| return a->key() < b->key(); |
| } |
| |
| std::string AdapterTypeToString(AdapterType type) { |
| switch (type) { |
| case ADAPTER_TYPE_ANY: |
| return "Wildcard"; |
| case ADAPTER_TYPE_UNKNOWN: |
| return "Unknown"; |
| case ADAPTER_TYPE_ETHERNET: |
| return "Ethernet"; |
| case ADAPTER_TYPE_WIFI: |
| return "Wifi"; |
| case ADAPTER_TYPE_CELLULAR: |
| return "Cellular"; |
| case ADAPTER_TYPE_VPN: |
| return "VPN"; |
| case ADAPTER_TYPE_LOOPBACK: |
| return "Loopback"; |
| default: |
| RTC_NOTREACHED() << "Invalid type " << type; |
| return std::string(); |
| } |
| } |
| |
| uint16_t ComputeNetworkCostByType(int type) { |
| switch (type) { |
| case rtc::ADAPTER_TYPE_ETHERNET: |
| case rtc::ADAPTER_TYPE_LOOPBACK: |
| return kNetworkCostMin; |
| case rtc::ADAPTER_TYPE_WIFI: |
| return kNetworkCostLow; |
| case rtc::ADAPTER_TYPE_CELLULAR: |
| return kNetworkCostHigh; |
| case rtc::ADAPTER_TYPE_ANY: |
| // Candidates gathered from the any-address/wildcard ports, as backups, |
| // are given the maximum cost so that if there are other candidates with |
| // known interface types, we would not select candidate pairs using these |
| // backup candidates if other selection criteria with higher precedence |
| // (network conditions over the route) are the same. Note that setting the |
| // cost to kNetworkCostUnknown would be problematic since |
| // ADAPTER_TYPE_CELLULAR would then have a higher cost. See |
| // P2PTransportChannel::SortConnectionsAndUpdateState for how we rank and |
| // select candidate pairs, where the network cost is among the criteria. |
| return kNetworkCostMax; |
| case rtc::ADAPTER_TYPE_VPN: |
| // The cost of a VPN should be computed using its underlying network type. |
| RTC_NOTREACHED(); |
| return kNetworkCostUnknown; |
| default: |
| return kNetworkCostUnknown; |
| } |
| } |
| |
| #if !defined(__native_client__) |
| bool IsIgnoredIPv6(const InterfaceAddress& ip) { |
| if (ip.family() != AF_INET6) { |
| return false; |
| } |
| |
| // Link-local addresses require scope id to be bound successfully. |
| // However, our IPAddress structure doesn't carry that so the |
| // information is lost and causes binding failure. |
| if (IPIsLinkLocal(ip)) { |
| return true; |
| } |
| |
| // Any MAC based IPv6 should be avoided to prevent the MAC tracking. |
| if (IPIsMacBased(ip)) { |
| return true; |
| } |
| |
| // Ignore deprecated IPv6. |
| if (ip.ipv6_flags() & IPV6_ADDRESS_FLAG_DEPRECATED) { |
| return true; |
| } |
| |
| return false; |
| } |
| #endif // !defined(__native_client__) |
| |
| } // namespace |
| |
| // These addresses are used as the targets to find out the default local address |
| // on a multi-homed endpoint. They are actually DNS servers. |
| const char kPublicIPv4Host[] = "8.8.8.8"; |
| const char kPublicIPv6Host[] = "2001:4860:4860::8888"; |
| const int kPublicPort = 53; // DNS port. |
| |
| std::string MakeNetworkKey(const std::string& name, |
| const IPAddress& prefix, |
| int prefix_length) { |
| rtc::StringBuilder ost; |
| ost << name << "%" << prefix.ToString() << "/" << prefix_length; |
| return ost.Release(); |
| } |
| // Test if the network name matches the type<number> pattern, e.g. eth0. The |
| // matching is case-sensitive. |
| bool MatchTypeNameWithIndexPattern(const std::string& network_name, |
| const std::string& type_name) { |
| if (network_name.find(type_name) != 0) { |
| return false; |
| } |
| return std::find_if(network_name.begin() + type_name.size(), |
| network_name.end(), |
| [](char c) { return !isdigit(c); }) == network_name.end(); |
| } |
| |
| // A cautious note that this method may not provide an accurate adapter type |
| // based on the string matching. Incorrect type of adapters can affect the |
| // result of the downstream network filtering, see e.g. |
| // BasicPortAllocatorSession::GetNetworks when |
| // PORTALLOCATOR_DISABLE_COSTLY_NETWORKS is turned on. |
| AdapterType GetAdapterTypeFromName(const char* network_name) { |
| if (MatchTypeNameWithIndexPattern(network_name, "lo")) { |
| // Note that we have a more robust way to determine if a network interface |
| // is a loopback interface by checking the flag IFF_LOOPBACK in ifa_flags of |
| // an ifaddr struct. See ConvertIfAddrs in this file. |
| return ADAPTER_TYPE_LOOPBACK; |
| } |
| if (MatchTypeNameWithIndexPattern(network_name, "eth")) { |
| return ADAPTER_TYPE_ETHERNET; |
| } |
| |
| if (MatchTypeNameWithIndexPattern(network_name, "ipsec") || |
| MatchTypeNameWithIndexPattern(network_name, "tun") || |
| MatchTypeNameWithIndexPattern(network_name, "utun") || |
| MatchTypeNameWithIndexPattern(network_name, "tap")) { |
| return ADAPTER_TYPE_VPN; |
| } |
| #if defined(WEBRTC_IOS) |
| // Cell networks are pdp_ipN on iOS. |
| if (MatchTypeNameWithIndexPattern(network_name, "pdp_ip")) { |
| return ADAPTER_TYPE_CELLULAR; |
| } |
| if (MatchTypeNameWithIndexPattern(network_name, "en")) { |
| // This may not be most accurate because sometimes Ethernet interface |
| // name also starts with "en" but it is better than showing it as |
| // "unknown" type. |
| // TODO(honghaiz): Write a proper IOS network manager. |
| return ADAPTER_TYPE_WIFI; |
| } |
| #elif defined(WEBRTC_ANDROID) |
| if (MatchTypeNameWithIndexPattern(network_name, "rmnet") || |
| MatchTypeNameWithIndexPattern(network_name, "rmnet_data") || |
| MatchTypeNameWithIndexPattern(network_name, "v4-rmnet") || |
| MatchTypeNameWithIndexPattern(network_name, "v4-rmnet_data") || |
| MatchTypeNameWithIndexPattern(network_name, "clat")) { |
| return ADAPTER_TYPE_CELLULAR; |
| } |
| if (MatchTypeNameWithIndexPattern(network_name, "wlan")) { |
| return ADAPTER_TYPE_WIFI; |
| } |
| #endif |
| |
| return ADAPTER_TYPE_UNKNOWN; |
| } |
| |
| NetworkManager::NetworkManager() {} |
| |
| NetworkManager::~NetworkManager() {} |
| |
| NetworkManager::EnumerationPermission NetworkManager::enumeration_permission() |
| const { |
| return ENUMERATION_ALLOWED; |
| } |
| |
| bool NetworkManager::GetDefaultLocalAddress(int family, IPAddress* addr) const { |
| return false; |
| } |
| |
| webrtc::MdnsResponderInterface* NetworkManager::GetMdnsResponder() const { |
| return nullptr; |
| } |
| |
| NetworkManagerBase::NetworkManagerBase() |
| : enumeration_permission_(NetworkManager::ENUMERATION_ALLOWED) {} |
| |
| NetworkManagerBase::~NetworkManagerBase() { |
| for (const auto& kv : networks_map_) { |
| delete kv.second; |
| } |
| } |
| |
| NetworkManager::EnumerationPermission |
| NetworkManagerBase::enumeration_permission() const { |
| return enumeration_permission_; |
| } |
| |
| void NetworkManagerBase::GetAnyAddressNetworks(NetworkList* networks) { |
| if (!ipv4_any_address_network_) { |
| const rtc::IPAddress ipv4_any_address(INADDR_ANY); |
| ipv4_any_address_network_.reset( |
| new rtc::Network("any", "any", ipv4_any_address, 0, ADAPTER_TYPE_ANY)); |
| ipv4_any_address_network_->set_default_local_address_provider(this); |
| ipv4_any_address_network_->set_mdns_responder_provider(this); |
| ipv4_any_address_network_->AddIP(ipv4_any_address); |
| } |
| networks->push_back(ipv4_any_address_network_.get()); |
| |
| if (!ipv6_any_address_network_) { |
| const rtc::IPAddress ipv6_any_address(in6addr_any); |
| ipv6_any_address_network_.reset( |
| new rtc::Network("any", "any", ipv6_any_address, 0, ADAPTER_TYPE_ANY)); |
| ipv6_any_address_network_->set_default_local_address_provider(this); |
| ipv6_any_address_network_->set_mdns_responder_provider(this); |
| ipv6_any_address_network_->AddIP(ipv6_any_address); |
| } |
| networks->push_back(ipv6_any_address_network_.get()); |
| } |
| |
| void NetworkManagerBase::GetNetworks(NetworkList* result) const { |
| result->clear(); |
| result->insert(result->begin(), networks_.begin(), networks_.end()); |
| } |
| |
| void NetworkManagerBase::MergeNetworkList(const NetworkList& new_networks, |
| bool* changed) { |
| NetworkManager::Stats stats; |
| MergeNetworkList(new_networks, changed, &stats); |
| } |
| |
| void NetworkManagerBase::MergeNetworkList(const NetworkList& new_networks, |
| bool* changed, |
| NetworkManager::Stats* stats) { |
| *changed = false; |
| // AddressList in this map will track IP addresses for all Networks |
| // with the same key. |
| std::map<std::string, AddressList> consolidated_address_list; |
| NetworkList list(new_networks); |
| std::sort(list.begin(), list.end(), CompareNetworks); |
| // First, build a set of network-keys to the ipaddresses. |
| for (Network* network : list) { |
| bool might_add_to_merged_list = false; |
| std::string key = MakeNetworkKey(network->name(), network->prefix(), |
| network->prefix_length()); |
| if (consolidated_address_list.find(key) == |
| consolidated_address_list.end()) { |
| AddressList addrlist; |
| addrlist.net = network; |
| consolidated_address_list[key] = addrlist; |
| might_add_to_merged_list = true; |
| } |
| const std::vector<InterfaceAddress>& addresses = network->GetIPs(); |
| AddressList& current_list = consolidated_address_list[key]; |
| for (const InterfaceAddress& address : addresses) { |
| current_list.ips.push_back(address); |
| } |
| if (!might_add_to_merged_list) { |
| delete network; |
| } else { |
| if (current_list.ips[0].family() == AF_INET) { |
| stats->ipv4_network_count++; |
| } else { |
| RTC_DCHECK(current_list.ips[0].family() == AF_INET6); |
| stats->ipv6_network_count++; |
| } |
| } |
| } |
| |
| // Next, look for existing network objects to re-use. |
| // Result of Network merge. Element in this list should have unique key. |
| NetworkList merged_list; |
| for (const auto& kv : consolidated_address_list) { |
| const std::string& key = kv.first; |
| Network* net = kv.second.net; |
| auto existing = networks_map_.find(key); |
| if (existing == networks_map_.end()) { |
| // This network is new. Place it in the network map. |
| merged_list.push_back(net); |
| networks_map_[key] = net; |
| net->set_id(next_available_network_id_++); |
| // Also, we might have accumulated IPAddresses from the first |
| // step, set it here. |
| net->SetIPs(kv.second.ips, true); |
| *changed = true; |
| } else { |
| // This network exists in the map already. Reset its IP addresses. |
| Network* existing_net = existing->second; |
| *changed = existing_net->SetIPs(kv.second.ips, *changed); |
| merged_list.push_back(existing_net); |
| if (net->type() != ADAPTER_TYPE_UNKNOWN && |
| net->type() != existing_net->type()) { |
| existing_net->set_type(net->type()); |
| *changed = true; |
| } |
| // If the existing network was not active, networks have changed. |
| if (!existing_net->active()) { |
| *changed = true; |
| } |
| RTC_DCHECK(net->active()); |
| if (existing_net != net) { |
| delete net; |
| } |
| } |
| networks_map_[key]->set_mdns_responder_provider(this); |
| } |
| // It may still happen that the merged list is a subset of |networks_|. |
| // To detect this change, we compare their sizes. |
| if (merged_list.size() != networks_.size()) { |
| *changed = true; |
| } |
| |
| // If the network list changes, we re-assign |networks_| to the merged list |
| // and re-sort it. |
| if (*changed) { |
| networks_ = merged_list; |
| // Reset the active states of all networks. |
| for (const auto& kv : networks_map_) { |
| Network* network = kv.second; |
| // If |network| is in the newly generated |networks_|, it is active. |
| bool found = std::find(networks_.begin(), networks_.end(), network) != |
| networks_.end(); |
| network->set_active(found); |
| } |
| std::sort(networks_.begin(), networks_.end(), SortNetworks); |
| // Now network interfaces are sorted, we should set the preference value |
| // for each of the interfaces we are planning to use. |
| // Preference order of network interfaces might have changed from previous |
| // sorting due to addition of higher preference network interface. |
| // Since we have already sorted the network interfaces based on our |
| // requirements, we will just assign a preference value starting with 127, |
| // in decreasing order. |
| int pref = kHighestNetworkPreference; |
| for (Network* network : networks_) { |
| network->set_preference(pref); |
| if (pref > 0) { |
| --pref; |
| } else { |
| RTC_LOG(LS_ERROR) << "Too many network interfaces to handle!"; |
| break; |
| } |
| } |
| } |
| } |
| |
| void NetworkManagerBase::set_default_local_addresses(const IPAddress& ipv4, |
| const IPAddress& ipv6) { |
| if (ipv4.family() == AF_INET) { |
| default_local_ipv4_address_ = ipv4; |
| } |
| if (ipv6.family() == AF_INET6) { |
| default_local_ipv6_address_ = ipv6; |
| } |
| } |
| |
| bool NetworkManagerBase::GetDefaultLocalAddress(int family, |
| IPAddress* ipaddr) const { |
| if (family == AF_INET && !default_local_ipv4_address_.IsNil()) { |
| *ipaddr = default_local_ipv4_address_; |
| return true; |
| } else if (family == AF_INET6 && !default_local_ipv6_address_.IsNil()) { |
| Network* ipv6_network = GetNetworkFromAddress(default_local_ipv6_address_); |
| if (ipv6_network) { |
| // If the default ipv6 network's BestIP is different than |
| // default_local_ipv6_address_, use it instead. |
| // This is to prevent potential IP address leakage. See WebRTC bug 5376. |
| *ipaddr = ipv6_network->GetBestIP(); |
| } else { |
| *ipaddr = default_local_ipv6_address_; |
| } |
| return true; |
| } |
| return false; |
| } |
| |
| Network* NetworkManagerBase::GetNetworkFromAddress( |
| const rtc::IPAddress& ip) const { |
| for (Network* network : networks_) { |
| const auto& ips = network->GetIPs(); |
| if (std::find_if(ips.begin(), ips.end(), |
| [ip](const InterfaceAddress& existing_ip) { |
| return ip == static_cast<rtc::IPAddress>(existing_ip); |
| }) != ips.end()) { |
| return network; |
| } |
| } |
| return nullptr; |
| } |
| |
| BasicNetworkManager::BasicNetworkManager() |
| : thread_(nullptr), |
| sent_first_update_(false), |
| start_count_(0), |
| ignore_non_default_routes_(false) {} |
| |
| BasicNetworkManager::~BasicNetworkManager() {} |
| |
| void BasicNetworkManager::OnNetworksChanged() { |
| RTC_LOG(LS_INFO) << "Network change was observed"; |
| UpdateNetworksOnce(); |
| } |
| |
| #if defined(__native_client__) |
| |
| bool BasicNetworkManager::CreateNetworks(bool include_ignored, |
| NetworkList* networks) const { |
| RTC_NOTREACHED(); |
| RTC_LOG(LS_WARNING) << "BasicNetworkManager doesn't work on NaCl yet"; |
| return false; |
| } |
| |
| #elif defined(WEBRTC_POSIX) |
| void BasicNetworkManager::ConvertIfAddrs(struct ifaddrs* interfaces, |
| IfAddrsConverter* ifaddrs_converter, |
| bool include_ignored, |
| NetworkList* networks) const { |
| NetworkMap current_networks; |
| |
| for (struct ifaddrs* cursor = interfaces; cursor != nullptr; |
| cursor = cursor->ifa_next) { |
| IPAddress prefix; |
| IPAddress mask; |
| InterfaceAddress ip; |
| int scope_id = 0; |
| |
| // Some interfaces may not have address assigned. |
| if (!cursor->ifa_addr || !cursor->ifa_netmask) { |
| continue; |
| } |
| // Skip ones which are down. |
| if (!(cursor->ifa_flags & IFF_RUNNING)) { |
| continue; |
| } |
| // Skip unknown family. |
| if (cursor->ifa_addr->sa_family != AF_INET && |
| cursor->ifa_addr->sa_family != AF_INET6) { |
| continue; |
| } |
| // Convert to InterfaceAddress. |
| if (!ifaddrs_converter->ConvertIfAddrsToIPAddress(cursor, &ip, &mask)) { |
| continue; |
| } |
| |
| // Special case for IPv6 address. |
| if (cursor->ifa_addr->sa_family == AF_INET6) { |
| if (IsIgnoredIPv6(ip)) { |
| continue; |
| } |
| scope_id = |
| reinterpret_cast<sockaddr_in6*>(cursor->ifa_addr)->sin6_scope_id; |
| } |
| |
| AdapterType adapter_type = ADAPTER_TYPE_UNKNOWN; |
| AdapterType vpn_underlying_adapter_type = ADAPTER_TYPE_UNKNOWN; |
| if (cursor->ifa_flags & IFF_LOOPBACK) { |
| adapter_type = ADAPTER_TYPE_LOOPBACK; |
| } else { |
| // If there is a network_monitor, use it to get the adapter type. |
| // Otherwise, get the adapter type based on a few name matching rules. |
| if (network_monitor_) { |
| adapter_type = network_monitor_->GetAdapterType(cursor->ifa_name); |
| } |
| if (adapter_type == ADAPTER_TYPE_UNKNOWN) { |
| adapter_type = GetAdapterTypeFromName(cursor->ifa_name); |
| } |
| } |
| |
| if (adapter_type == ADAPTER_TYPE_VPN && network_monitor_) { |
| vpn_underlying_adapter_type = |
| network_monitor_->GetVpnUnderlyingAdapterType(cursor->ifa_name); |
| } |
| int prefix_length = CountIPMaskBits(mask); |
| prefix = TruncateIP(ip, prefix_length); |
| std::string key = |
| MakeNetworkKey(std::string(cursor->ifa_name), prefix, prefix_length); |
| auto iter = current_networks.find(key); |
| if (iter == current_networks.end()) { |
| // TODO(phoglund): Need to recognize other types as well. |
| std::unique_ptr<Network> network( |
| new Network(cursor->ifa_name, cursor->ifa_name, prefix, prefix_length, |
| adapter_type)); |
| network->set_default_local_address_provider(this); |
| network->set_scope_id(scope_id); |
| network->AddIP(ip); |
| network->set_ignored(IsIgnoredNetwork(*network)); |
| network->set_underlying_type_for_vpn(vpn_underlying_adapter_type); |
| if (include_ignored || !network->ignored()) { |
| current_networks[key] = network.get(); |
| networks->push_back(network.release()); |
| } |
| } else { |
| Network* existing_network = iter->second; |
| existing_network->AddIP(ip); |
| if (adapter_type != ADAPTER_TYPE_UNKNOWN) { |
| existing_network->set_type(adapter_type); |
| existing_network->set_underlying_type_for_vpn( |
| vpn_underlying_adapter_type); |
| } |
| } |
| } |
| } |
| |
| bool BasicNetworkManager::CreateNetworks(bool include_ignored, |
| NetworkList* networks) const { |
| struct ifaddrs* interfaces; |
| int error = getifaddrs(&interfaces); |
| if (error != 0) { |
| RTC_LOG_ERR(LERROR) << "getifaddrs failed to gather interface data: " |
| << error; |
| return false; |
| } |
| |
| std::unique_ptr<IfAddrsConverter> ifaddrs_converter(CreateIfAddrsConverter()); |
| ConvertIfAddrs(interfaces, ifaddrs_converter.get(), include_ignored, |
| networks); |
| |
| freeifaddrs(interfaces); |
| return true; |
| } |
| |
| #elif defined(WEBRTC_WIN) |
| |
| unsigned int GetPrefix(PIP_ADAPTER_PREFIX prefixlist, |
| const IPAddress& ip, |
| IPAddress* prefix) { |
| IPAddress current_prefix; |
| IPAddress best_prefix; |
| unsigned int best_length = 0; |
| while (prefixlist) { |
| // Look for the longest matching prefix in the prefixlist. |
| if (prefixlist->Address.lpSockaddr == nullptr || |
| prefixlist->Address.lpSockaddr->sa_family != ip.family()) { |
| prefixlist = prefixlist->Next; |
| continue; |
| } |
| switch (prefixlist->Address.lpSockaddr->sa_family) { |
| case AF_INET: { |
| sockaddr_in* v4_addr = |
| reinterpret_cast<sockaddr_in*>(prefixlist->Address.lpSockaddr); |
| current_prefix = IPAddress(v4_addr->sin_addr); |
| break; |
| } |
| case AF_INET6: { |
| sockaddr_in6* v6_addr = |
| reinterpret_cast<sockaddr_in6*>(prefixlist->Address.lpSockaddr); |
| current_prefix = IPAddress(v6_addr->sin6_addr); |
| break; |
| } |
| default: { |
| prefixlist = prefixlist->Next; |
| continue; |
| } |
| } |
| if (TruncateIP(ip, prefixlist->PrefixLength) == current_prefix && |
| prefixlist->PrefixLength > best_length) { |
| best_prefix = current_prefix; |
| best_length = prefixlist->PrefixLength; |
| } |
| prefixlist = prefixlist->Next; |
| } |
| *prefix = best_prefix; |
| return best_length; |
| } |
| |
| bool BasicNetworkManager::CreateNetworks(bool include_ignored, |
| NetworkList* networks) const { |
| NetworkMap current_networks; |
| // MSDN recommends a 15KB buffer for the first try at GetAdaptersAddresses. |
| size_t buffer_size = 16384; |
| std::unique_ptr<char[]> adapter_info(new char[buffer_size]); |
| PIP_ADAPTER_ADDRESSES adapter_addrs = |
| reinterpret_cast<PIP_ADAPTER_ADDRESSES>(adapter_info.get()); |
| int adapter_flags = (GAA_FLAG_SKIP_DNS_SERVER | GAA_FLAG_SKIP_ANYCAST | |
| GAA_FLAG_SKIP_MULTICAST | GAA_FLAG_INCLUDE_PREFIX); |
| int ret = 0; |
| do { |
| adapter_info.reset(new char[buffer_size]); |
| adapter_addrs = reinterpret_cast<PIP_ADAPTER_ADDRESSES>(adapter_info.get()); |
| ret = GetAdaptersAddresses(AF_UNSPEC, adapter_flags, 0, adapter_addrs, |
| reinterpret_cast<PULONG>(&buffer_size)); |
| } while (ret == ERROR_BUFFER_OVERFLOW); |
| if (ret != ERROR_SUCCESS) { |
| return false; |
| } |
| int count = 0; |
| while (adapter_addrs) { |
| if (adapter_addrs->OperStatus == IfOperStatusUp) { |
| PIP_ADAPTER_UNICAST_ADDRESS address = adapter_addrs->FirstUnicastAddress; |
| PIP_ADAPTER_PREFIX prefixlist = adapter_addrs->FirstPrefix; |
| std::string name; |
| std::string description; |
| #if !defined(NDEBUG) |
| name = ToUtf8(adapter_addrs->FriendlyName, |
| wcslen(adapter_addrs->FriendlyName)); |
| #endif |
| description = ToUtf8(adapter_addrs->Description, |
| wcslen(adapter_addrs->Description)); |
| for (; address; address = address->Next) { |
| #if defined(NDEBUG) |
| name = rtc::ToString(count); |
| #endif |
| |
| IPAddress ip; |
| int scope_id = 0; |
| std::unique_ptr<Network> network; |
| switch (address->Address.lpSockaddr->sa_family) { |
| case AF_INET: { |
| sockaddr_in* v4_addr = |
| reinterpret_cast<sockaddr_in*>(address->Address.lpSockaddr); |
| ip = IPAddress(v4_addr->sin_addr); |
| break; |
| } |
| case AF_INET6: { |
| sockaddr_in6* v6_addr = |
| reinterpret_cast<sockaddr_in6*>(address->Address.lpSockaddr); |
| scope_id = v6_addr->sin6_scope_id; |
| ip = IPAddress(v6_addr->sin6_addr); |
| |
| if (IsIgnoredIPv6(InterfaceAddress(ip))) { |
| continue; |
| } |
| |
| break; |
| } |
| default: { |
| continue; |
| } |
| } |
| |
| IPAddress prefix; |
| int prefix_length = GetPrefix(prefixlist, ip, &prefix); |
| std::string key = MakeNetworkKey(name, prefix, prefix_length); |
| auto existing_network = current_networks.find(key); |
| if (existing_network == current_networks.end()) { |
| AdapterType adapter_type = ADAPTER_TYPE_UNKNOWN; |
| switch (adapter_addrs->IfType) { |
| case IF_TYPE_SOFTWARE_LOOPBACK: |
| adapter_type = ADAPTER_TYPE_LOOPBACK; |
| break; |
| case IF_TYPE_ETHERNET_CSMACD: |
| case IF_TYPE_ETHERNET_3MBIT: |
| case IF_TYPE_IEEE80212: |
| case IF_TYPE_FASTETHER: |
| case IF_TYPE_FASTETHER_FX: |
| case IF_TYPE_GIGABITETHERNET: |
| adapter_type = ADAPTER_TYPE_ETHERNET; |
| break; |
| case IF_TYPE_IEEE80211: |
| adapter_type = ADAPTER_TYPE_WIFI; |
| break; |
| case IF_TYPE_WWANPP: |
| case IF_TYPE_WWANPP2: |
| adapter_type = ADAPTER_TYPE_CELLULAR; |
| break; |
| default: |
| // TODO(phoglund): Need to recognize other types as well. |
| adapter_type = ADAPTER_TYPE_UNKNOWN; |
| break; |
| } |
| std::unique_ptr<Network> network(new Network( |
| name, description, prefix, prefix_length, adapter_type)); |
| network->set_default_local_address_provider(this); |
| network->set_mdns_responder_provider(this); |
| network->set_scope_id(scope_id); |
| network->AddIP(ip); |
| bool ignored = IsIgnoredNetwork(*network); |
| network->set_ignored(ignored); |
| if (include_ignored || !network->ignored()) { |
| current_networks[key] = network.get(); |
| networks->push_back(network.release()); |
| } |
| } else { |
| (*existing_network).second->AddIP(ip); |
| } |
| } |
| // Count is per-adapter - all 'Networks' created from the same |
| // adapter need to have the same name. |
| ++count; |
| } |
| adapter_addrs = adapter_addrs->Next; |
| } |
| return true; |
| } |
| #endif // WEBRTC_WIN |
| |
| #if defined(WEBRTC_LINUX) |
| bool IsDefaultRoute(const std::string& network_name) { |
| FILE* f = fopen("/proc/net/route", "r"); |
| if (!f) { |
| RTC_LOG(LS_WARNING) |
| << "Couldn't read /proc/net/route, skipping default " |
| << "route check (assuming everything is a default route)."; |
| return true; |
| } |
| bool is_default_route = false; |
| char line[500]; |
| while (fgets(line, sizeof(line), f)) { |
| char iface_name[256]; |
| unsigned int iface_ip, iface_gw, iface_mask, iface_flags; |
| if (sscanf(line, "%255s %8X %8X %4X %*d %*u %*d %8X", iface_name, &iface_ip, |
| &iface_gw, &iface_flags, &iface_mask) == 5 && |
| network_name == iface_name && iface_mask == 0 && |
| (iface_flags & (RTF_UP | RTF_HOST)) == RTF_UP) { |
| is_default_route = true; |
| break; |
| } |
| } |
| fclose(f); |
| return is_default_route; |
| } |
| #endif |
| |
| bool BasicNetworkManager::IsIgnoredNetwork(const Network& network) const { |
| // Ignore networks on the explicit ignore list. |
| for (const std::string& ignored_name : network_ignore_list_) { |
| if (network.name() == ignored_name) { |
| return true; |
| } |
| } |
| |
| #if defined(WEBRTC_POSIX) |
| // Filter out VMware/VirtualBox interfaces, typically named vmnet1, |
| // vmnet8, or vboxnet0. |
| if (strncmp(network.name().c_str(), "vmnet", 5) == 0 || |
| strncmp(network.name().c_str(), "vnic", 4) == 0 || |
| strncmp(network.name().c_str(), "vboxnet", 7) == 0) { |
| return true; |
| } |
| #if defined(WEBRTC_LINUX) |
| // Make sure this is a default route, if we're ignoring non-defaults. |
| if (ignore_non_default_routes_ && !IsDefaultRoute(network.name())) { |
| return true; |
| } |
| #endif |
| #elif defined(WEBRTC_WIN) |
| // Ignore any HOST side vmware adapters with a description like: |
| // VMware Virtual Ethernet Adapter for VMnet1 |
| // but don't ignore any GUEST side adapters with a description like: |
| // VMware Accelerated AMD PCNet Adapter #2 |
| if (strstr(network.description().c_str(), "VMnet") != nullptr) { |
| return true; |
| } |
| #endif |
| |
| // Ignore any networks with a 0.x.y.z IP |
| if (network.prefix().family() == AF_INET) { |
| return (network.prefix().v4AddressAsHostOrderInteger() < 0x01000000); |
| } |
| |
| return false; |
| } |
| |
| void BasicNetworkManager::StartUpdating() { |
| thread_ = Thread::Current(); |
| if (start_count_) { |
| // If network interfaces are already discovered and signal is sent, |
| // we should trigger network signal immediately for the new clients |
| // to start allocating ports. |
| if (sent_first_update_) |
| thread_->Post(RTC_FROM_HERE, this, kSignalNetworksMessage); |
| } else { |
| thread_->Post(RTC_FROM_HERE, this, kUpdateNetworksMessage); |
| StartNetworkMonitor(); |
| } |
| ++start_count_; |
| } |
| |
| void BasicNetworkManager::StopUpdating() { |
| RTC_DCHECK(Thread::Current() == thread_); |
| if (!start_count_) |
| return; |
| |
| --start_count_; |
| if (!start_count_) { |
| thread_->Clear(this); |
| sent_first_update_ = false; |
| StopNetworkMonitor(); |
| } |
| } |
| |
| void BasicNetworkManager::StartNetworkMonitor() { |
| NetworkMonitorFactory* factory = NetworkMonitorFactory::GetFactory(); |
| if (factory == nullptr) { |
| return; |
| } |
| if (!network_monitor_) { |
| network_monitor_.reset(factory->CreateNetworkMonitor()); |
| if (!network_monitor_) { |
| return; |
| } |
| network_monitor_->SignalNetworksChanged.connect( |
| this, &BasicNetworkManager::OnNetworksChanged); |
| } |
| network_monitor_->Start(); |
| } |
| |
| void BasicNetworkManager::StopNetworkMonitor() { |
| if (!network_monitor_) { |
| return; |
| } |
| network_monitor_->Stop(); |
| } |
| |
| void BasicNetworkManager::OnMessage(Message* msg) { |
| switch (msg->message_id) { |
| case kUpdateNetworksMessage: { |
| UpdateNetworksContinually(); |
| break; |
| } |
| case kSignalNetworksMessage: { |
| SignalNetworksChanged(); |
| break; |
| } |
| default: |
| RTC_NOTREACHED(); |
| } |
| } |
| |
| IPAddress BasicNetworkManager::QueryDefaultLocalAddress(int family) const { |
| RTC_DCHECK(thread_ == Thread::Current()); |
| RTC_DCHECK(thread_->socketserver() != nullptr); |
| RTC_DCHECK(family == AF_INET || family == AF_INET6); |
| |
| std::unique_ptr<AsyncSocket> socket( |
| thread_->socketserver()->CreateAsyncSocket(family, SOCK_DGRAM)); |
| if (!socket) { |
| RTC_LOG_ERR(LERROR) << "Socket creation failed"; |
| return IPAddress(); |
| } |
| |
| if (socket->Connect(SocketAddress( |
| family == AF_INET ? kPublicIPv4Host : kPublicIPv6Host, kPublicPort)) < |
| 0) { |
| if (socket->GetError() != ENETUNREACH && |
| socket->GetError() != EHOSTUNREACH) { |
| // Ignore the expected case of "host/net unreachable" - which happens if |
| // the network is V4- or V6-only. |
| RTC_LOG(LS_INFO) << "Connect failed with " << socket->GetError(); |
| } |
| return IPAddress(); |
| } |
| return socket->GetLocalAddress().ipaddr(); |
| } |
| |
| void BasicNetworkManager::UpdateNetworksOnce() { |
| if (!start_count_) |
| return; |
| |
| RTC_DCHECK(Thread::Current() == thread_); |
| |
| NetworkList list; |
| if (!CreateNetworks(false, &list)) { |
| SignalError(); |
| } else { |
| bool changed; |
| NetworkManager::Stats stats; |
| MergeNetworkList(list, &changed, &stats); |
| set_default_local_addresses(QueryDefaultLocalAddress(AF_INET), |
| QueryDefaultLocalAddress(AF_INET6)); |
| if (changed || !sent_first_update_) { |
| SignalNetworksChanged(); |
| sent_first_update_ = true; |
| } |
| } |
| } |
| |
| void BasicNetworkManager::UpdateNetworksContinually() { |
| UpdateNetworksOnce(); |
| thread_->PostDelayed(RTC_FROM_HERE, kNetworksUpdateIntervalMs, this, |
| kUpdateNetworksMessage); |
| } |
| |
| void BasicNetworkManager::DumpNetworks() { |
| NetworkList list; |
| GetNetworks(&list); |
| RTC_LOG(LS_INFO) << "NetworkManager detected " << list.size() << " networks:"; |
| for (const Network* network : list) { |
| RTC_LOG(LS_INFO) << network->ToString() << ": " << network->description() |
| << ", active ? " << network->active() |
| << ((network->ignored()) ? ", Ignored" : ""); |
| } |
| } |
| |
| Network::Network(const std::string& name, |
| const std::string& desc, |
| const IPAddress& prefix, |
| int prefix_length) |
| : name_(name), |
| description_(desc), |
| prefix_(prefix), |
| prefix_length_(prefix_length), |
| key_(MakeNetworkKey(name, prefix, prefix_length)), |
| scope_id_(0), |
| ignored_(false), |
| type_(ADAPTER_TYPE_UNKNOWN), |
| preference_(0) {} |
| |
| Network::Network(const std::string& name, |
| const std::string& desc, |
| const IPAddress& prefix, |
| int prefix_length, |
| AdapterType type) |
| : name_(name), |
| description_(desc), |
| prefix_(prefix), |
| prefix_length_(prefix_length), |
| key_(MakeNetworkKey(name, prefix, prefix_length)), |
| scope_id_(0), |
| ignored_(false), |
| type_(type), |
| preference_(0) {} |
| |
| Network::Network(const Network&) = default; |
| |
| Network::~Network() = default; |
| |
| // Sets the addresses of this network. Returns true if the address set changed. |
| // Change detection is short circuited if the changed argument is true. |
| bool Network::SetIPs(const std::vector<InterfaceAddress>& ips, bool changed) { |
| // Detect changes with a nested loop; n-squared but we expect on the order |
| // of 2-3 addresses per network. |
| changed = changed || ips.size() != ips_.size(); |
| if (!changed) { |
| for (const InterfaceAddress& ip : ips) { |
| if (std::find(ips_.begin(), ips_.end(), ip) == ips_.end()) { |
| changed = true; |
| break; |
| } |
| } |
| } |
| |
| ips_ = ips; |
| return changed; |
| } |
| |
| // Select the best IP address to use from this Network. |
| IPAddress Network::GetBestIP() const { |
| if (ips_.size() == 0) { |
| return IPAddress(); |
| } |
| |
| if (prefix_.family() == AF_INET) { |
| return static_cast<IPAddress>(ips_.at(0)); |
| } |
| |
| InterfaceAddress selected_ip, ula_ip; |
| |
| for (const InterfaceAddress& ip : ips_) { |
| // Ignore any address which has been deprecated already. |
| if (ip.ipv6_flags() & IPV6_ADDRESS_FLAG_DEPRECATED) |
| continue; |
| |
| // ULA address should only be returned when we have no other |
| // global IP. |
| if (IPIsULA(static_cast<const IPAddress&>(ip))) { |
| ula_ip = ip; |
| continue; |
| } |
| selected_ip = ip; |
| |
| // Search could stop once a temporary non-deprecated one is found. |
| if (ip.ipv6_flags() & IPV6_ADDRESS_FLAG_TEMPORARY) |
| break; |
| } |
| |
| // No proper global IPv6 address found, use ULA instead. |
| if (IPIsUnspec(selected_ip) && !IPIsUnspec(ula_ip)) { |
| selected_ip = ula_ip; |
| } |
| |
| return static_cast<IPAddress>(selected_ip); |
| } |
| |
| webrtc::MdnsResponderInterface* Network::GetMdnsResponder() const { |
| if (mdns_responder_provider_ == nullptr) { |
| return nullptr; |
| } |
| return mdns_responder_provider_->GetMdnsResponder(); |
| } |
| |
| uint16_t Network::GetCost() const { |
| AdapterType type = IsVpn() ? underlying_type_for_vpn_ : type_; |
| return ComputeNetworkCostByType(type); |
| } |
| |
| std::string Network::ToString() const { |
| rtc::StringBuilder ss; |
| // Print out the first space-terminated token of the network desc, plus |
| // the IP address. |
| ss << "Net[" << description_.substr(0, description_.find(' ')) << ":" |
| << prefix_.ToSensitiveString() << "/" << prefix_length_ << ":" |
| << AdapterTypeToString(type_); |
| if (IsVpn()) { |
| ss << "/" << AdapterTypeToString(underlying_type_for_vpn_); |
| } |
| ss << ":id=" << id_ << "]"; |
| return ss.Release(); |
| } |
| |
| } // namespace rtc |
