IndySockets/Indy

Indy - Internet Direct

mezen

@mezen

sslvrPeer: A Request from a client certificate will be sent to the client. The client may opt to ignore the request, but if a certificate is sent back, it will be verified.
sslvrfFailIfNoPeerCert: only used for server when sslvrPeeris set. Use of this flag will cause the handshake to terminate immendiatly if no certificate is provided by the client.
sslvrfClientOnce: only used for server when sslvrPeeris set. Use of this flag will prevent the server from requesting a certificate from the client in the case of renegotiation. A certificate will still be requested during the initial handshake

@mmarquee so you have to set VerifyMode to [sslvrfPeer, sslvrfFailIfNoPeerCert]

mezen

@mezen

Good source is https://wiki.openssl.org/index.php/Manual:SSL_CTX_set_verify(3)
SSL_VERIFY_NONE is VerifyMode := [];

Mark Humphreys

@mmarquee

@mezen Super, setting those values will disable connection until a correct client certificate it sent. Been looking at this for hours working out what was wrong. Thanks

Remy Lebeau

@rlebeau

@mezen BASIC is an actual authentication scheme of its own. Setting BasicAuthentication=True just means that TIdHTTP is allowed to fall back to BASIC if not using any other authentication

DelphiWorlds

@DelphiWorlds

I have an application that "advertises" itself by way of a UDP broadcast.. if I call Broadcast on TIdUDPClient, is it supposed to broadcast on all bindable IP addresses, or does it just pick the first one, or something else? Is using UDP an advisable way of doing this in the first place? I note that for IPv6 networks I'll have to use multicast anyway

Note that the comms is (for now) just happening on the local network

DelphiWorlds

@DelphiWorlds

Managed to find this:
https://stackoverflow.com/questions/39121642/permanent-listener-to-ssdp-udp-broadcasts

DelphiWorlds

@DelphiWorlds

I think I might need TIdIPMCastClient/Server.. just need to work out how to use them

DelphiWorlds

@DelphiWorlds

I'm attempting to bind all local addresses to the TIdIPMCastClient, but it fails with socket error 10049

Not sure what value I should be putting for MulticastGroup in the server, either

DelphiWorlds

@DelphiWorlds

ok.. that error happens on iOS Simulator.. not on Win32

DelphiWorlds

@DelphiWorlds

...and also errors on iOS

Remy Lebeau

@rlebeau

@DelphiWorlds Sending a UDP broadcast will go out on a single IP interface of the OS's choosing, unless you bind the socket to a specific interface beforehand, or use the broadcast IP of a specific subnet rather than the generic 255.255.255.255 broadcast address. If you want to broadcast on all available interfaces, you have to send a broadcast to each one individually.

Remy Lebeau

@rlebeau

@DelphiWorlds I can't comment on your 10049 error without seeing how you are binding the IPs to begin with. The MulticastGroup is the network multicast IP address that you want to send/receive packets on (the IP that routers watch for on packets), which is different than the local IP address that you bind sockets to. IPv4 multicast group addresses are in the 224.x.x.x to 239.x.x.x range. IPv6 multicast group addresses are in the FF0x:x:x:x:x:x:x:x range

DelphiWorlds

@DelphiWorlds

I'm not going beyond the router, so I assume I won't need multicast? I just need to make sure the broadcast is seen through the correct connection..

DelphiWorlds

@DelphiWorlds

I think I may be on the right track with this:
https://stackoverflow.com/questions/37045719/udp-broadcasting-with-indy-sockets-how-to-select-the-right-interface

I need to loop through the available IPs and send on each

DelphiWorlds

@DelphiWorlds

ok.. I need multicast because IPv6 is involved

procedure TNetworkingModel.ConfigureUDPBindings(const AListener: TIdIPMCastClient);
var
LHandle: TIdSocketHandle;
I: Integer;
begin
AListener.Bindings.Clear;
for I := 0 to FLocalAddresses.Count - 1 do
begin
LHandle := AListener.Bindings.Add;
LHandle.IPVersion := FLocalAddresses.Addresses[I].IPVersion;
LHandle.IP := FLocalAddresses.Addresses[I].IPAddress;
LHandle.Port := AListener.DefaultPort;
end;
end;

oops

not that good with gitter

procedure TNetworkingModel.ConfigureUDPBindings(const AListener: TIdIPMCastClient);
var
  LHandle: TIdSocketHandle;
  I: Integer;
begin
  AListener.Bindings.Clear;
  for I := 0 to FLocalAddresses.Count - 1 do
  begin
    LHandle := AListener.Bindings.Add;
    LHandle.IPVersion := FLocalAddresses.Addresses[I].IPVersion;
    LHandle.IP := FLocalAddresses.Addresses[I].IPAddress;
    LHandle.Port := AListener.DefaultPort;
  end;
end;

that's how I'm configuring the bindings

DelphiWorlds

@DelphiWorlds

if I don't attempt to bind the IPv6 addresses, no error

DelphiWorlds

@DelphiWorlds

TIdIPMCastServer also errors if attempting a Send on an IPv6 address

Debugger Exception Notification

Project dyld_sim raised exception class EIdSocketError with message 'Socket Error # 49

Cannot assign requested address.'.

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DelphiWorlds

@DelphiWorlds

even if I ignore the IPv6 addresses, my client (192.168.56.100) doesn't receive a broadcast from the server (192.168.56.1)

Remy Lebeau

@rlebeau

@DelphiWorlds how are you sending the broadcast? What does that code look like?

DelphiWorlds

@DelphiWorlds

Francesco Marano may have given me a solution in the forums.. the thread starts here:
https://forums.embarcadero.com/message.jspa?messageID=887844&tstart=0

I neglected to consider that the IPMCast classes have their own IPVersion property, as well as MulticastGroup property.. doh

DelphiWorlds

@DelphiWorlds

if you read Francesco's last reply, his example code works on Windows, fails on iOS.. same error

It fails when setting the client active

DelphiWorlds

@DelphiWorlds

TIdStackVCLPosix.GetLocalAddressList fails to retrieve any addresses for me on my Android 7 device, so I've created this Gist, in case it's of any use:
https://gist.github.com/DelphiWorlds/0733b6611707c8d5725ee42fd1ae01fd

Remy Lebeau

@rlebeau

@DelphiWorlds TIdStackVCLPosix.GetLocalAddressList() being broken on Android is a known issue. There are comments to that effect in the code. I stay away from using Embarcadero's JNI Bridge interfaces because 1) they are not portable (they only work in Delphi, not in FreePascal), and 2) there are threading issues related to accessing Java objects in native code, so I try to stick with native solutions. Which I have not implemented for Android yet.

DelphiWorlds

@DelphiWorlds

ok.. no clues about what might be causing the failure on iOS? I'm also having problems attempting to broadcast on each IP address.. for some reason or another using a loop it broadcasts only on the last address

procedure TForm1.SendBroadcast(const AServer: TIdIPMCastServer; const ABroadcast: string);
var
  I: Integer;
begin
  for I := 0 to FLocalAddresses.Count - 1 do
  begin
    if FLocalAddresses[I].IPVersion = AServer.IPVersion then
    begin
      AServer.Active := False;
      AServer.BoundIP := FLocalAddresses[I].IPAddress;
      AServer.BoundPort := AServer.Port;
      AServer.Active := True;
      AServer.Send(ABroadcast);
    end;
  end;
end;

Remy Lebeau

@rlebeau

@DelphiWorlds I'm not a multicast expert, or an iOS user, I can't tell you why it fails on iOS. What is the actual error? On which line of code? Where are you setting AServer.MulticastGroup? Is that group valid on all networks you are trying to bind to?

DelphiWorlds

@DelphiWorlds

I posted the error earlier, and it occurs when attempting to set Active to True on the TIdIPMCastClient

Remy Lebeau

@rlebeau

@DelphiWorlds the code above is server, not client. Do you have problems if you use a separate TIdIPMCastServer for each local IP, instead of binding and re-binding a single TIdIPMcastServer over and over?

DelphiWorlds

@DelphiWorlds

I mean earlier than that

For now I'll assume it's because the MulticastGroup value is invalid.. I'm far from a multicast expert, too ;-)

Remy Lebeau

@rlebeau

@DelphiWorlds What is the EXACT error? What does the EXACT call stack look like when the error is raised?

DelphiWorlds

@DelphiWorlds

I posted the exact error message earlier.. one moment and I'll have a call stack

Exact error message again:
Project dyld_sim raised exception class EIdSocketError with message 'Socket Error # 49
Cannot assign requested address.'.

Call stack:
System._DbgExcNotify(0,$C9B3010,$909364 {'EIdSocketError'},$6306C8,nil)
System.NotifyReRaise
:00017cc7 NotifyReRaise + $13
IdStack.TIdStack.RaiseSocketError(49)
IdStack.TIdStack.RaiseLastSocketError
IdStack.TIdStack.CheckForSocketError(-1)
IdStackVCLPosix.TIdStackVCLPosix.SetSocketOption(9,41,12,(no value),20)
IdStackBSDBase.TIdStackBSDBase.MembershipSockOpt(9,???,'0:0:0:0:0:0:0:0',12,Id_IPv6)
IdStackBSDBase.TIdStackBSDBase.AddMulticastMembership(9,'FF01:0:0:0:0:0:0:1','0:0:0:0:0:0:0:0',Id_IPv6)
IdSocketHandle.TIdSocketHandle.AddMulticastMembership('FF01:0:0:0:0:0:0:1')
:00633c46 TIdSocketHandle.AddMulticastMembership + $3A
IdIPMCastBase.TIdIPMCastBase.SetActive(True)
Multicast.TMulticastModule.EnableServices(True)
Multicast.TMulticastModule.Create($D820800)

the same code works on Windows.. but I'm guessing that may be irrelevant given differences in OS

Remy Lebeau

@rlebeau

@DelphiWorlds The error is coming from setsockopt() when adding a local IP to the multicast group, which is done after the socket is bound locally. The local IP that is being passed in is 0:0:0:0:0:0:0 (aka in6addr_any), which comes from the TIdSocketHandle.IP property, which is updated after binding. If the socket is bound to a specific local IP and not to in6addr_any, the TIdSocketHandle.IP property should not be all zeros. That implies a possible failure in TIdSocketHandle.UpdateBindingLocal(). But no matter, because the local IP is not currently being passed to setsockopt(IPV6_ADD_MEMBERSHIP) in IPv6, it is set to the default multicast interface instead. Maybe that is what iOS is complaining about.

DelphiWorlds

@DelphiWorlds

I see what you mean (from MembershipSockOpt)

DelphiWorlds

@DelphiWorlds

Some information here:
https://forums.developer.apple.com/message/71107
I'm still digesting it...

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Debugger Exception Notification

Cannot assign requested address.'.

Break Continue Help