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added callback example: setting sni cb & arg server side, and passing the name client side via -S flag

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This commit is contained in:
gasbytes
2024-06-03 21:24:54 +02:00
parent c325de993d
commit c04c7685b1
1 changed files with 42 additions and 15 deletions
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57
wrapper/CSharp/wolfSSL-TLS-Server/wolfSSL-TLS-Server.cs
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@ -66,7 +66,19 @@ public class wolfSSL_TLS_CSHarp
} }
} }
/// <summary>
/// Example of a SNI function call back
/// </summary>
/// <param name="ssl">pointer to ssl structure</param>
/// <param name="ret">alert code</param>
/// <param name="exArg">context arg, can be set with the function wolfssl.CTX_set_servername_arg</param>
/// <returns></returns>
public static int my_sni_server_cb(IntPtr ssl, IntPtr ret, IntPtr exArg) {
/* Trivial callback just for testing */
Console.WriteLine("my sni server callback");
return wolfssl.SUCCESS;
}
public static void Main(string[] args) public static void Main(string[] args)
{ {
@ -74,6 +86,7 @@ public class wolfSSL_TLS_CSHarp
IntPtr ssl; IntPtr ssl;
Socket fd; Socket fd;
IntPtr sniHostName; IntPtr sniHostName;
IntPtr arg_sni;
/* These paths should be changed for use */ /* These paths should be changed for use */
string fileCert = @"server-cert.pem"; string fileCert = @"server-cert.pem";
@ -118,21 +131,6 @@ public class wolfSSL_TLS_CSHarp
return; return;
} }
if (haveSNI(args))
{
string sniHostNameString = args[1].Trim();
sniHostName = Marshal.StringToHGlobalAnsi(sniHostNameString);
ushort size = (ushort)sniHostNameString.Length;
if (wolfssl.CTX_UseSNI(ctx, (byte)wolfssl.WOLFSSL_SNI_HOST_NAME, sniHostName, size) != wolfssl.SUCCESS)
{
Console.WriteLine("UseSNI failed");
wolfssl.CTX_free(ctx);
return;
}
}
StringBuilder ciphers = new StringBuilder(new String(' ', 4096)); StringBuilder ciphers = new StringBuilder(new String(' ', 4096));
wolfssl.get_ciphers(ciphers, 4096); wolfssl.get_ciphers(ciphers, 4096);
Console.WriteLine("Ciphers : " + ciphers.ToString()); Console.WriteLine("Ciphers : " + ciphers.ToString());
@ -155,6 +153,34 @@ public class wolfSSL_TLS_CSHarp
return; return;
} }
if (haveSNI(args))
{
string sniHostNameString = args[1].Trim();
sniHostName = Marshal.StringToHGlobalAnsi(sniHostNameString);
ushort size = (ushort)sniHostNameString.Length;
// Allocating memory and setting SNI arg
int test_value = 32;
arg_sni = Marshal.AllocHGlobal(sizeof(int));
Marshal.WriteInt32(arg_sni, test_value);
if (wolfssl.CTX_set_servername_arg(ctx, arg_sni) == wolfssl.FAILURE) {
Console.WriteLine("wolfssl.CTX_set_servername_arg failed");
wolfssl.CTX_free(ctx);
return;
}
// Setting SNI delegate
wolfssl.sni_delegate sni_cb = new wolfssl.sni_delegate(my_sni_server_cb);
wolfssl.CTX_set_servername_callback(ctx, sni_cb);
if (wolfssl.CTX_set_tlsext_servername_callback(ssl, sni_cb) == wolfssl.FAILURE) {
Console.WriteLine("wolfssl.CTX_set_tlsext_servername_callback failed");
wolfssl.CTX_free(ctx);
return;
}
}
Console.WriteLine("Connection made wolfSSL_accept "); Console.WriteLine("Connection made wolfSSL_accept ");
if (wolfssl.set_fd(ssl, fd) != wolfssl.SUCCESS) if (wolfssl.set_fd(ssl, fd) != wolfssl.SUCCESS)
{ {
@ -201,6 +227,7 @@ public class wolfSSL_TLS_CSHarp
wolfssl.shutdown(ssl); wolfssl.shutdown(ssl);
fd.Close(); fd.Close();
tcp.Stop(); tcp.Stop();
clean(ssl, ctx); clean(ssl, ctx);
} }
} }