michael.heier/jellyfin
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Whilst fixing issues with SSDP on devices with multiple interfaces, i came across a design issue in the current code - namely interfaces without a gateway were ignored.

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Fixing this required the removal of the code that attempted to detect virtual interfaces. Not wanting to remove functionality, but not able to keep the code in place, I implemented a work around solution (see 4 below).

Whilst in the area, I also fixed a few minor bugs i encountered (1, 5, 6 below) and stopped SSDP messages from going out on non-LAN interfaces (3)

All these changes are related.

Changes

1 IsInPrivateAddressSpace - improved subnet code checking
2 interfaces with no gateway were being excluded from SSDP blasts
3 filtered SSDP blasts from not LAN addresses as defined on the network page.
4 removed #986 mod - as this was part of the issue of #2986. Interfaces can be excluded from the LAN by putting the LAN address in brackets. eg. [10.1.1.1] will exclude an interface with ip address 10.1.1.1 from SSDP
5 fixed a problem where an invalid LAN address causing the SSDP to crash
6 corrected local link filter (FilterIPAddress) to filter on 169.254. addresses
This commit is contained in:
BaronGreenback 2020-04-28 21:45:46 +01:00
parent aa6d52277d
commit 2aaecb8e14
6 changed files with 98 additions and 71 deletions
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6
Emby.Dlna/Main/DlnaEntryPoint.cs
View File

@ -266,6 +266,12 @@ namespace Emby.Dlna.Main
continue;
}
// Limit to LAN addresses only
if (!_networkManager.IsAddressInSubnets(address, true, true))
{
continue;
}
var fullService = "urn:schemas-upnp-org:device:MediaServer:1";
_logger.LogInformation("Registering publisher for {0} on {1}", fullService, address);

2
Emby.Server.Implementations/ApplicationHost.cs
View File

@ -1274,7 +1274,7 @@ namespace Emby.Server.Implementations
if (addresses.Count == 0)
{
addresses.AddRange(_networkManager.GetLocalIpAddresses(ServerConfigurationManager.Configuration.IgnoreVirtualInterfaces));
addresses.AddRange(_networkManager.GetLocalIpAddresses());
}
var resultList = new List<IPAddress>();

135
Emby.Server.Implementations/Networking/NetworkManager.cs
View File

@ -56,13 +56,13 @@ namespace Emby.Server.Implementations.Networking
NetworkChanged?.Invoke(this, EventArgs.Empty);
}
public IPAddress[] GetLocalIpAddresses(bool ignoreVirtualInterface = true)
public IPAddress[] GetLocalIpAddresses()
{
lock (_localIpAddressSyncLock)
{
if (_localIpAddresses == null)
{
var addresses = GetLocalIpAddressesInternal(ignoreVirtualInterface).ToArray();
var addresses = GetLocalIpAddressesInternal().ToArray();
_localIpAddresses = addresses;
}
@ -71,42 +71,45 @@ namespace Emby.Server.Implementations.Networking
}
}
private List<IPAddress> GetLocalIpAddressesInternal(bool ignoreVirtualInterface)
private List<IPAddress> GetLocalIpAddressesInternal()
{
var list = GetIPsDefault(ignoreVirtualInterface).ToList();
var list = GetIPsDefault().ToList();
if (list.Count == 0)
{
list = GetLocalIpAddressesFallback().GetAwaiter().GetResult().ToList();
}
var listClone = list.ToList();
var listClone = new List<IPAddress>();
return list
var subnets = LocalSubnetsFn();
foreach (var i in list)
{
if (i.IsIPv6LinkLocal || i.ToString().StartsWith("169.254.", StringComparison.OrdinalIgnoreCase))
{
continue;
}
if (Array.IndexOf(subnets, "[" + i.ToString() + "]") == -1)
{
listClone.Add(i);
}
}
return listClone
.OrderBy(i => i.AddressFamily == AddressFamily.InterNetwork ? 0 : 1)
.ThenBy(i => listClone.IndexOf(i))
.Where(FilterIpAddress)
// .ThenBy(i => listClone.IndexOf(i))
.GroupBy(i => i.ToString())
.Select(x => x.First())
.ToList();
}
private static bool FilterIpAddress(IPAddress address)
{
if (address.IsIPv6LinkLocal
|| address.ToString().StartsWith("169.", StringComparison.OrdinalIgnoreCase))
{
return false;
}
return true;
}
public bool IsInPrivateAddressSpace(string endpoint)
{
return IsInPrivateAddressSpace(endpoint, true);
}
// checks if the address in endpoint is an RFC1918, RFC1122, or RFC3927 address
private bool IsInPrivateAddressSpace(string endpoint, bool checkSubnets)
{
if (string.Equals(endpoint, "::1", StringComparison.OrdinalIgnoreCase))
@ -128,23 +131,28 @@ namespace Emby.Server.Implementations.Networking
}
// Private address space:
// http://en.wikipedia.org/wiki/Private_network
if (endpoint.StartsWith("172.", StringComparison.OrdinalIgnoreCase))
{
return Is172AddressPrivate(endpoint);
}
if (endpoint.StartsWith("localhost", StringComparison.OrdinalIgnoreCase) ||
endpoint.StartsWith("127.", StringComparison.OrdinalIgnoreCase) ||
endpoint.StartsWith("169.", StringComparison.OrdinalIgnoreCase))
if (endpoint.ToLower() == "localhost")
{
return true;
}
if (checkSubnets && endpoint.StartsWith("192.168", StringComparison.OrdinalIgnoreCase))
try
{
return true;
byte[] octet = IPAddress.Parse(endpoint).GetAddressBytes();
if ((octet[0] == 10) ||
(octet[0] == 172 && (octet[1] >= 16 && octet[1] <= 31)) || // RFC1918
(octet[0] == 192 && octet[1] == 168) || // RFC1918
(octet[0] == 127) || // RFC1122
(octet[0] == 169 && octet[1] == 254)) // RFC3927
{
return false;
}
}
catch
{
// return false;
}
if (checkSubnets && IsInPrivateAddressSpaceAndLocalSubnet(endpoint))
@ -177,6 +185,7 @@ namespace Emby.Server.Implementations.Networking
return false;
}
// Gives a list of possible subnets from the system whose interface ip starts with endpointFirstPart
private List<string> GetSubnets(string endpointFirstPart)
{
lock (_subnetLookupLock)
@ -222,19 +231,6 @@ namespace Emby.Server.Implementations.Networking
}
}
private static bool Is172AddressPrivate(string endpoint)
{
for (var i = 16; i <= 31; i++)
{
if (endpoint.StartsWith("172." + i.ToString(CultureInfo.InvariantCulture) + ".", StringComparison.OrdinalIgnoreCase))
{
return true;
}
}
return false;
}
public bool IsInLocalNetwork(string endpoint)
{
return IsInLocalNetworkInternal(endpoint, true);
@ -245,18 +241,47 @@ namespace Emby.Server.Implementations.Networking
return IsAddressInSubnets(IPAddress.Parse(addressString), addressString, subnets);
}
// returns true if address is in the LAN list in the config file
// always returns false if address has been excluded from the LAN if excludeInterfaces is true
// and excludes RFC addresses if excludeRFC is true
public bool IsAddressInSubnets(IPAddress address, bool excludeInterfaces, bool excludeRFC)
{
byte[] octet = address.GetAddressBytes();
if ((octet[0] == 127) || // RFC1122
(octet[0] == 169 && octet[1] == 254)) // RFC3927
{
// don't use on loopback or 169 interfaces
return false;
}
string addressString = address.ToString();
string excludeAddress = "[" + addressString + "]";
var subnets = LocalSubnetsFn();
// Exclude any addresses if they appear in the LAN list in [ ]
if (Array.IndexOf(subnets, excludeAddress) != -1)
{
return false;
}
return IsAddressInSubnets(address, addressString, subnets);
}
// Checks to see if address/addressString (same but different type) falls within subnets[]
private static bool IsAddressInSubnets(IPAddress address, string addressString, string[] subnets)
{
foreach (var subnet in subnets)
{
var normalizedSubnet = subnet.Trim();
// is the subnet a host address and does it match the address being passes?
if (string.Equals(normalizedSubnet, addressString, StringComparison.OrdinalIgnoreCase))
{
return true;
}
// parse CIDR subnets and see if address falls within it.
if (normalizedSubnet.Contains('/', StringComparison.Ordinal))
{
try
{
var ipNetwork = IPNetwork.Parse(normalizedSubnet);
if (ipNetwork.Contains(address))
@ -264,6 +289,11 @@ namespace Emby.Server.Implementations.Networking
return true;
}
}
catch
{
// Ignoring - invalid subnet passed encountered.
}
}
}
return false;
@ -360,7 +390,7 @@ namespace Emby.Server.Implementations.Networking
return Dns.GetHostAddressesAsync(hostName);
}
private IEnumerable<IPAddress> GetIPsDefault(bool ignoreVirtualInterface)
private IEnumerable<IPAddress> GetIPsDefault()
{
IEnumerable<NetworkInterface> interfaces;
@ -380,15 +410,7 @@ namespace Emby.Server.Implementations.Networking
{
var ipProperties = network.GetIPProperties();
// Try to exclude virtual adapters
// http://stackoverflow.com/questions/8089685/c-sharp-finding-my-machines-local-ip-address-and-not-the-vms
var addr = ipProperties.GatewayAddresses.FirstOrDefault();
if (addr == null
|| (ignoreVirtualInterface
&& (addr.Address.Equals(IPAddress.Any) || addr.Address.Equals(IPAddress.IPv6Any))))
{
return Enumerable.Empty<IPAddress>();
}
// Exclude any addresses if they appear in the LAN list in [ ]
return ipProperties.UnicastAddresses
.Select(i => i.Address)
@ -493,8 +515,6 @@ namespace Emby.Server.Implementations.Networking
}
foreach (NetworkInterface ni in interfaces)
{
if (ni.GetIPProperties().GatewayAddresses.FirstOrDefault() != null)
{
foreach (UnicastIPAddressInformation ip in ni.GetIPProperties().UnicastAddresses)
{
@ -504,7 +524,6 @@ namespace Emby.Server.Implementations.Networking
}
}
}
}
return null;
}

4
MediaBrowser.Common/Net/INetworkManager.cs
View File

@ -41,10 +41,12 @@ namespace MediaBrowser.Common.Net
/// <returns><c>true</c> if [is in local network] [the specified endpoint]; otherwise, <c>false</c>.</returns>
bool IsInLocalNetwork(string endpoint);
IPAddress[] GetLocalIpAddresses(bool ignoreVirtualInterface);
IPAddress[] GetLocalIpAddresses();
bool IsAddressInSubnets(string addressString, string[] subnets);
bool IsAddressInSubnets(IPAddress address, bool excludeInterfaces, bool excludeRFC);
bool IsInSameSubnet(IPAddress address1, IPAddress address2, IPAddress subnetMask);
IPAddress GetLocalIpSubnetMask(IPAddress address);

2
RSSDP/SsdpCommunicationsServer.cs
View File

@ -370,7 +370,7 @@ namespace Rssdp.Infrastructure
if (_enableMultiSocketBinding)
{
foreach (var address in _networkManager.GetLocalIpAddresses(_config.Configuration.IgnoreVirtualInterfaces))
foreach (var address in _networkManager.GetLocalIpAddresses())
{
if (address.AddressFamily == AddressFamily.InterNetworkV6)
{