[Mono-dev] mono & IPv6

Rick Tillery rtillerywork at gmail.com
Thu Mar 1 16:09:34 UTC 2018


We're having problems getting IPv6 working with mono (5.0.1.1 on
RHEL/CentOS).

I have IPv4 & IPv6 addresses for a test server. I can ping/ping6 both of
these addresses. And I am able to use curl (wget not installed on the
minimal headless machines we use for test) to download the HTML (after
disabling trust check) using both addresses.

To eliminate our code (which works on Winders), I borrowed some source from
https://gist.github.com/bugchk/ec7b46ad9ee47a13e377f6994d961c0f to use
instead:









































*using System;using System.Net; // Compile with "mcs wget.cs" namespace
wget{    class Program    {        static void Main(string[] args)        {
           if (args.Length < 1 || args.Length > 2)            {
               Console.WriteLine();                Console.WriteLine("
Usage: wget.exe http://urltodownload.com/file.ext
<http://urltodownload.com/file.ext> [output_path]");
               Console.WriteLine();                Environment.Exit(-1);
           }            var urlPath = args[0];            var uriParts =
urlPath.Split('/');            var outputPath = args.Length >= 2 ? args[1]
: uriParts[uriParts.Length - 1];            using (var client = new
WebClient())            {                // client.Credentials = new
NetworkCredential("user", "password");                try                {
                   client.DownloadFile(urlPath, outputPath);
                   Environment.Exit(0);                }
               catch(Exception ex)                {
                   Console.WriteLine(ex.ToString());
                   Console.WriteLine(ex.Message);
                   Environment.Exit(-1);                }            }
       }    }}*

Unfortunately, in our environment, they're are no http servers, only https.
So I issues an IPv4 command like:

*$ mono wget.exe https://10.192.100.50 <https://10.192.100.50>*

Using just an IP address, the error below is expected (I tried a couple of
methods to disable the trust check, but no joy), but it still indicates
that the host was reached, which is all I'm trying to verify at this point.
























*System.Net.WebException: Error: TrustFailure (Ssl error:1000007d:SSL
routines:OPENSSL_internal:CERTIFICATE_VERIFY_FAILED  at
/builddir/build/BUILD/mono-5.0.1.1/external/boringssl/ssl/handshake_client.c:1132)
---> Mono.Btls.MonoBtlsException: Ssl error:1000007d:SSL
routines:OPENSSL_internal:CERTIFICATE_VERIFY_FAILED  at
/builddir/build/BUILD/mono-5.0.1.1/external/boringssl/ssl/handshake_client.c:1132
 at Mono.Btls.MonoBtlsContext.ProcessHandshake () [0x00038] in
<1d7393d853954016b607e8e348b00ad1>:0  at
Mono.Net.Security.MobileAuthenticatedStream.ProcessHandshake
(Mono.Net.Security.AsyncProtocolRequest asyncRequest,
Mono.Net.Security.AsyncOperationStatus status) [0x0002a] in
<1d7393d853954016b607e8e348b00ad1>:0  at
Mono.Net.Security.AsyncProtocolRequest.ProcessOperation
(Mono.Net.Security.AsyncOperationStatus status) [0x0006b] in
<1d7393d853954016b607e8e348b00ad1>:0  at
Mono.Net.Security.AsyncProtocolRequest.ProcessOperation () [0x0000d] in
<1d7393d853954016b607e8e348b00ad1>:0  at
Mono.Net.Security.AsyncProtocolRequest.StartOperation () [0x0003c] in
<1d7393d853954016b607e8e348b00ad1>:0  at
Mono.Net.Security.AsyncProtocolRequest.StartOperation
(Mono.Net.Security.AsyncOperation operation) [0x00024] in
<1d7393d853954016b607e8e348b00ad1>:0  at
Mono.Net.Security.MobileAuthenticatedStream.ProcessAuthentication
(System.Net.LazyAsyncResult lazyResult) [0x00057] in
<1d7393d853954016b607e8e348b00ad1>:0 --- End of stack trace from previous
location where exception was thrown ---  at
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c]
in <3753d1715b8842d8bb13a30db0388b60>:0  at
Mono.Net.Security.MobileAuthenticatedStream.ProcessAuthentication
(System.Net.LazyAsyncResult lazyResult) [0x00078] in
<1d7393d853954016b607e8e348b00ad1>:0  at
Mono.Net.Security.MobileAuthenticatedStream.AuthenticateAsClient
(System.String targetHost,
System.Security.Cryptography.X509Certificates.X509CertificateCollection
clientCertificates, System.Security.Authentication.SslProtocols
enabledSslProtocols, System.Boolean checkCertificateRevocation) [0x0000c]
in <1d7393d853954016b607e8e348b00ad1>:0  at
Mono.Net.Security.Private.MonoSslStreamWrapper.AuthenticateAsClient
(System.String targetHost,
System.Security.Cryptography.X509Certificates.X509CertificateCollection
clientCertificates, System.Security.Authentication.SslProtocols
enabledSslProtocols, System.Boolean checkCertificateRevocation) [0x00006]
in <1d7393d853954016b607e8e348b00ad1>:0  at
Mono.Net.Security.MonoTlsStream.CreateStream (System.Byte[] buffer)
[0x0007b] in <1d7393d853954016b607e8e348b00ad1>:0  at
System.Net.WebConnection.CreateStream (System.Net.HttpWebRequest request)
[0x00073] in <1d7393d853954016b607e8e348b00ad1>:0   --- End of inner
exception stack trace ---  at System.Net.WebClient.DownloadFile (System.Uri
address, System.String fileName) [0x000ad] in
<1d7393d853954016b607e8e348b00ad1>:0  at System.Net.WebClient.DownloadFile
(System.String address, System.String fileName) [0x00016] in
<1d7393d853954016b607e8e348b00ad1>:0  at (wrapper
remoting-invoke-with-check) System.Net.WebClient:DownloadFile
(string,string)  at wget.Program.Main (System.String[] args) [0x00061] in
<24ce9e68afff4791842d98a8ce379a1e>:0 Error: TrustFailure (Ssl
error:1000007d:SSL routines:OPENSSL_internal:CERTIFICATE_VERIFY_FAILED  at
/builddir/build/BUILD/mono-5.0.1.1/external/boringssl/ssl/handshake_client.c:1132)*

But, when I use the same command with an IPv4 address:

*$ mono wget.exe https://[fe39:abcd:ef01:2345::c]*

I get a failure to find the host.









*System.Net.WebException: Error: ConnectFailure (No route to host) --->
System.Net.Sockets.SocketException: No route to host  at
System.Net.Sockets.Socket.Connect (System.Net.EndPoint remoteEP) [0x000b6]
in <1d7393d853954016b607e8e348b00ad1>:0  at
System.Net.WebConnection.Connect (System.Net.HttpWebRequest request)
[0x0016d] in <1d7393d853954016b607e8e348b00ad1>:0   --- End of inner
exception stack trace ---  at System.Net.WebClient.DownloadFile (System.Uri
address, System.String fileName) [0x000ad] in
<1d7393d853954016b607e8e348b00ad1>:0  at System.Net.WebClient.DownloadFile
(System.String address, System.String fileName) [0x00016] in
<1d7393d853954016b607e8e348b00ad1>:0  at (wrapper
remoting-invoke-with-check) System.Net.WebClient:DownloadFile
(string,string)  at wget.Program.Main (System.String[] args) [0x00061] in
<24ce9e68afff4791842d98a8ce379a1e>:0 Error: ConnectFailure (No route to
host)‚Äč*

Any suggestions as to why IPv6 doesn't appear to be working through mono?

Rick
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