merijnb

Thanks Primoz, The timer was just an example though, I need a message loop in a thread for several async stuff which is going on there.

In that feature request there is a link to this one: https://sourceforge.net/p/gexperts/bugs/148/ And that one says resolved 🙂 @dummzeuch need any more info on this?

Is this still open source? I might take look myself if you can't find the time.

note: We have seen these issues with multiple versions of the OpenSSL binaries, including the ones bundled with ICS 8.64. Please consider the following code snippet: var s := TSslContext.Create(nil); try s.SslCALines.Text := sslRootCACertsBundle(); try s.InitContext(); except on e: exception do ShowMessage(e.Message); end; finally s.Free(); end; This snippet works on most machines, but we have a few machines at client sites, where this code raises an exception: 'Error reading info file "Lines"'. (We haven't figured out yet why these specific machines have this issue). This exception is raised on OverbyteIcsWSocket.pas:14667 (ICS 8.64). InfoStack := PStack(f_PEM_X509_INFO_read_bio(InBIO, nil, nil, nil)); if not Assigned(InfoStack) then raise ESslContextException.CreateFmt('Error reading info file "%s"', [FileName]); Apparently the call to f_PEM_X509_INFO_read_bio() failed, but no information is give why, so we've added some calls to f_ERR_get_error() to see what is going wrong, and then it turns out the call to f_PEM_X509_INFO_read_bio() sets the error code 151580774 (get_header_and_data). To find out which of the hard coded certificates returned by sslRootCACertsBundle() were making this error happening, we've passed each of the certificates (sslRootCACerts001, sslRootCACerts002, etc) one by one to an TSSLContext to see which ones failed. This showed 2 interesting things: There is a 'typo' in sslRootCACerts009 and sslRootCACerts011: 'AGAT/3B+XxFNSRuzFVJ7yVTav52Vr2ua2J7p8eRDjeIRRDq/r72DQnNSi6q7pynP' + #13#10 + '9WQcCk3RvKqsnyrQ/39/2n3qse0wJcGE2jTSW3iDVuycNsMm4hH2Z0kdkquM++v/' + #13#10 + 'eu6FSqdQgPCnXEqULl8FmTxSQeDNtGPPAUO6nIPcj2A781q0tHuu2guQOHXvgR1m' + #13#10 + '0vdXcDazv/wor3ElhVsT/h5/WrQ8' + #13#10; sslRootCACerts010 = '-----END CERTIFICATE-----' + #13#10 + '# X509 SSL Certificate' + #13#10 + and 'S0Zj/gA0QHDBw7mh3aZw4gSzQbzpgJHqZJx64SIDqZxubw5lT2yHh17zbqD5daWb' + #13#10 + 'QOhTsiedSrnAdyGN/4fy3ryM7xfft0kL0fJuMAsaDk527RH89elWsn2/x20Kk4yl' + #13#10 + '0MC2Hb46TpSi125sC8KKfPog88Tk5c0NqMuRkrF8hey1FGlmDoLnzc7ILaZRfyHB' + #13#10 + 'NVOFBkpdn627G190' + #13#10; sslRootCACerts012 = '-----END CERTIFICATE-----' + #13#10 + '# X509 SSL Certificate' + #13#10 + (the END CERTIFICATE line is part of the wrong constant), which isn't a problem when you call sslRootCACertsBundle() since all constants are concatenated, but which shows up if you try to use these certificates separately. More interestingly, one these specific machines there seems to be an issue with sslRootCACerts033 and sslRootCACerts034. This is sslRootCACerts033: # X509 SSL Certificate # Subject Common Name: GlobalSign # Subject Organisation: GlobalSign # Subject Organisation Unit: GlobalSign Root CA - R2 # GlobalSign Root R2 SHA1 • RSA • 2048 # Issuer: Self Signed # Expires: 15/12/2021 -----BEGIN CERTIFICATE----- MIIDujCCAqKgAwIBAgILBAAAAAABD4Ym5g0wDQYJKoZIhvcNAQEFBQAwTDEgMB4G A1UECxMXR2xvYmFsU2lnbiBSb290IENBIC0gUjIxEzARBgNVBAoTCkdsb2JhbFNp Z24xEzARBgNVBAMTCkdsb2JhbFNpZ24wHhcNMDYxMjE1MDgwMDAwWhcNMjExMjE1 MDgwMDAwWjBMMSAwHgYDVQQLExdHbG9iYWxTaWduIFJvb3QgQ0EgLSBSMjETMBEG A1UEChMKR2xvYmFsU2lnbjETMBEGA1UEAxMKR2xvYmFsU2lnbjCCASIwDQYJKoZI hvcNAQEBBQADggEPADCCAQoCggEBAKbPJA6+Lm8omUVCxKs+IVSbC9N/hHD6ErPL v4dfxn+G07IwXNb9rfF73OX4YJYJkhD10FPe+3t+c4isUoh7SqbKSaZeqKeMWhG8 eoLrvozps6yWJQeXSpkqBy+0Hne/ig+1AnwblrjFuTosvNYSuetZfeLQBoZfXklq tTleiDTsvHgMCJiEbKjNS7SgfQx5TfC4LcshytVsW33hoCmEofnTlEnLJGKRILzd C9XZzPnqJworc5HGnRusyMvo4KD0L5CLTfuwNhv2GXqF4G3yYROIXJ/gkwpRl4pa zq+r1feqCapgvdzZX99yqWATXgAByUr6P6TqBwMhAo6CygPCm48CAwEAAaOBnDCB mTAOBgNVHQ8BAf8EBAMCAQYwDwYDVR0TAQH/BAUwAwEB/zAdBgNVHQ4EFgQUm+IH V2ccHsBqBt5ZtJot39wZhi4wNgYDVR0fBC8wLTAroCmgJ4YlaHR0cDovL2NybC5n bG9iYWxzaWduLm5ldC9yb290LXIyLmNybDAfBgNVHSMEGDAWgBSb4gdXZxwewGoG 3lm0mi3f3BmGLjANBgkqhkiG9w0BAQUFAAOCAQEAmYFThxxol4aR7OBKuEQLq4Gs J0/WwbgcQ3izDJr86iw8bmEbTUsp9Z8FHSbBuOmDAGJFtqkIk7mpM0sYmsL4h4hO 291xNBrBVNpGP+DTKqttVCL1OmLNIG+6KYnX3ZHu01yiPqFbQfXf5WRDLenVOavS ot+3i9DAgBkcRcAtjOj4LaR0VknFBbVPFd5uRHg5h6h+u/N5GJG79G+dwfCMNYxd AfvDbbnvRG15RjF+Cv6pgsH/76tuIMRQyV+dTZsXjAzlAcmgQWpzU/qlULRuJQ/7 TBj0/VLZjmmx6BEP3ojY+x1J96relc8geMJgEtslQIxq/H5COEBkEveegeGTLg== -----END CERTIFICATE----- When processing this certificate on these specific machines OpenSSL gives this error, unless: - I remove one of the • in the 5th line from the top. (As long as there is only 1 • in the file it's ok, as soon as I add a 2nd • anywhere in the header the error returns) - I add a CRLF at the bottom of the file The same thing applies to sslRootCACerts034. I realize that this is probably a bug in OpenSSL itself, but it might be wise to remove the •'s from the hard coded certificates to work around this issue. Curious if anyone can shed some light on the cause of this 🙂 Merijn

Or just convert it to ascii of unicode gives the issues

I can confirm that this checkbox was checked, after unchecking and rebooting the problem is gone.

I'm trying to receive UDP packets which are sent to a multicast group. I can see the packets being received in WireShark (dest ip = 225.255.255.255 dest port = 1120), and can receive the data using an example python script I found on the net, meaning that UDP multicast group and port are correct. I'm creating an UDP server like this: var UDPServer: TWSocketServer; begin UDPServer := TWSocketServer.Create(Self); UDPServer.Proto := 'udp'; UDPServer.Addr := '0.0.0.0'; UDPServer.Port := '1120'; UDPServer.MultiCast := true; UDPServer.ReuseAddr := true; UDPServer.MultiCastAddrStr := '225.255.255.255'; UDPServer.OnDataAvailable := OnUDPDataAvailable; UDPServer.Listen(); end; The OnUDPDataAvailable is never called, am I missing something here in setting the server up properly to listen for this group?

The issue currently is not listening on multiple ports and / or addresses, receiving multicast data on a single ip and port doesnt' work either. It seems to be with the fact that you need to register with the kernel what unicast groups you want to listen to, otherwise the datagrams aren't even passed to your process.

Hey Dave, I'm not going to switch from ICS to Indy, but with your experience with getting receiving multicast, can you see if there is anything wrong with the snippet from ICS above, or can you see if there is anything missing? Is calling setsocktopt with IP_ADD_MEMBERSHIP what needs to be done?

UDP singlecast and broadcast is working fine (I've done that many times), this is the first time I need to use multicast though and it behaves a little bit differently internally (the whole IP_ADD_MEMBERSHIP thing). I respect you (Angus) can't help me though, any other takers? Or do we know who wrote this part in ICS originally?

Hi Remy, Thanks, but I realize that, but the multicast group ip being used is 225.255.255.255 (easy to overlook that 🙂 )

Tx for the wonderful quick reply. I've looked at TIcsIpStrmLog but there is no use of multicast in there. With regard to MultiCastAddrStr being for sending only I'm quite sure it's not. I've found several places where it's mentioned that to use multicast listening it's required to call setsockopt() with IP_ADD_MEMBERSHIP to 'register' the multicast group you want to listen to with the kernel, the working piece of Python code also does something similar. Other places this is mentioned are for example: https://stackoverflow.com/questions/43322462/multicast-packet-seen-in-wireshark-but-not-received-by-user-program-windows-an and http://www.tldp.org/HOWTO/Multicast-HOWTO-6.html There is something in the ICS wiki about receiving multicast data: WS.Proto:='udp'; WS.Addr:='192.168.0.1'; // IP address of the physical adapter I want to bind to WS.Port:='5000'; WS.MultiCast:=true; WS.ReuseAddr:=true; WS.MultiCastAddrStr:='239.192.1.1'; // Mutlicast IP WS.Listen; (from http://wiki.overbyte.eu/wiki/index.php/TWSocket.MultiCast) I also see something like that in OverbyteIcsWsocket: if FMultiCast then begin if FAddrFormat = AF_INET then begin { Use setsockopt() to join a multicast group } { mreq.imr_multiaddr.s_addr := WSocket_inet_addr('225.0.0.37');} { mreq.imr_multiaddr.s_addr := sin.sin_addr.s_addr;} { mreq.imr_multiaddr.s_addr := WSocket_inet_addr(FAddrStr);} mreq.imr_multiaddr.s_addr := WSocket_Synchronized_inet_addr(PAnsiChar(AnsiString(FMultiCastAddrStr))); { mreq.imr_interface.s_addr := htonl(INADDR_ANY);} { RK} mreq.imr_interface.s_addr := WSocket_Synchronized_ResolveHost(AnsiString(FAddrStr)).s_addr; iStatus := WSocket_Synchronized_SetSockOpt(FHSocket, IPPROTO_IP, IP_ADD_MEMBERSHIP, @mreq, SizeOf(mreq)); if iStatus <> 0 then begin SocketError('setsockopt(IP_ADD_MEMBERSHIP)'); Exit; end; So I'm quite sure that it's required for receiving multicast data, but for some reason I'm not receiving anything, as if the implementation in the last snippet has something wrong. Do we know who is the author of this snippet? Thanks again!