sfdnsres: Cleanup service and implements some calls (#2130)

* sfdnsres: Cleanup service and implements some calls

This PR is a big cleanup to our current implementation of `sfdnsres` service.
Additionnaly to that, some calls and fix have been done by @Thog (PRd with approval, thanks to her).
- Implementation of `GetAddrInfoRequest` (Fixes #637).
- Partial implementation of `GetHostByNameRequestWithOptions`, `GetHostByAddrRequestWithOptions` and `GetAddrInfoRequestWithOptions` (Fixes #642, Fixes #1233).

A DNS Blacklist have been done by @riperiperi (which is currently used in LDN build, then that reduces code differences between the LDN build and master.

Now a lot of games are playable or are blocked to the menu because it needs online service:

Co-Authored-By: Mary <1760003+Thog@users.noreply.github.com>
Co-Authored-By: riperiperi <6294155+riperiperi@users.noreply.github.com>

* Addressed gdkchan's comments

* IPAddress[] to IEnumerable

* Nits

Co-authored-by: Mary <1760003+Thog@users.noreply.github.com>
Co-authored-by: riperiperi <6294155+riperiperi@users.noreply.github.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/Ryujinx.HLE/HOS/Services/Sockets/Sfdnsres/Proxy/DnsBlacklist.cs b/Ryujinx.HLE/HOS/Services/Sockets/Sfdnsres/Proxy/DnsBlacklist.cs
new file mode 100644
index 00000000..db499e24
--- /dev/null
+++ b/Ryujinx.HLE/HOS/Services/Sockets/Sfdnsres/Proxy/DnsBlacklist.cs
@@ -0,0 +1,28 @@
+using System.Text.RegularExpressions;
+
+namespace Ryujinx.HLE.HOS.Services.Sockets.Sfdnsres.Proxy
+{
+    static class DnsBlacklist
+    {
+        private static readonly Regex[] BlockedHosts = new Regex[]
+        {
+            new Regex(@"^g(.*)\-lp1\.s\.n\.srv\.nintendo\.net$"),
+            new Regex(@"^(.*)\-sb\-api\.accounts\.nintendo\.com$"),
+            new Regex(@"^(.*)\-sb\.accounts\.nintendo\.com$"),
+            new Regex(@"^accounts\.nintendo\.com$")
+        };
+
+        public static bool IsHostBlocked(string host)
+        {
+            foreach (Regex regex in BlockedHosts)
+            {
+                if (regex.IsMatch(host))
+                {
+                    return true;
+                }
+            }
+
+            return false;
+        }
+    }
+}
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