Add dlts_client.c and dtls_server.c
diff --git a/programs/ssl/dtls_client.c b/programs/ssl/dtls_client.c
new file mode 100644
index 0000000..7c95c44
--- /dev/null
+++ b/programs/ssl/dtls_client.c
@@ -0,0 +1,343 @@
+/*
+ * Simple DTLS client demonstration program
+ *
+ * Copyright (C) 2014, Brainspark B.V.
+ *
+ * This file is part of PolarSSL (http://www.polarssl.org)
+ * Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
+ *
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#if !defined(POLARSSL_CONFIG_FILE)
+#include "polarssl/config.h"
+#else
+#include POLARSSL_CONFIG_FILE
+#endif
+
+#if !defined(POLARSSL_SSL_CLI_C) || !defined(POLARSSL_SSL_PROTO_DTLS) || \
+ !defined(POLARSSL_NET_C) || \
+ !defined(POLARSSL_ENTROPY_C) || !defined(POLARSSL_CTR_DRBG_C) || \
+ !defined(POLARSSL_X509_CRT_PARSE_C) || !defined(POLARSSL_RSA_C) || \
+ !defined(POLARSSL_CERTS_C)
+
+#include <stdio.h>
+int main( int argc, char *argv[] )
+{
+ ((void) argc);
+ ((void) argv);
+
+ printf( "POLARSSL_SSL_CLI_C and/or POLARSSL_SSL_PROTO_DTLS and/or "
+ "POLARSSL_NET_C and/or "
+ "POLARSSL_ENTROPY_C and/or POLARSSL_CTR_DRBG_C and/or "
+ "POLARSSL_X509_CRT_PARSE_C and/or POLARSSL_RSA_C and/or "
+ "POLARSSL_CERTS_C not defined.\n" );
+ return( 0 );
+}
+#else
+
+#include <string.h>
+#include <stdio.h>
+
+#include "polarssl/net.h"
+#include "polarssl/debug.h"
+#include "polarssl/ssl.h"
+#include "polarssl/entropy.h"
+#include "polarssl/ctr_drbg.h"
+#include "polarssl/error.h"
+#include "polarssl/certs.h"
+
+#define SERVER_PORT 4433
+#define SERVER_NAME "localhost"
+#define SERVER_ADDR "127.0.0.1" /* forces IPv4 */
+#define MESSAGE "Echo this"
+
+#define READ_TIMEOUT_MS 1000
+#define MAX_RETRY 5
+
+#define DEBUG_LEVEL 0
+
+static void my_debug( void *ctx, int level, const char *str )
+{
+ ((void) level);
+
+ fprintf( (FILE *) ctx, "%s", str );
+ fflush( (FILE *) ctx );
+}
+
+int main( int argc, char *argv[] )
+{
+ int ret, len, server_fd = -1;
+ unsigned char buf[1024];
+ const char *pers = "dtls_client";
+ int retry_left = MAX_RETRY;
+
+ entropy_context entropy;
+ ctr_drbg_context ctr_drbg;
+ ssl_context ssl;
+ x509_crt cacert;
+
+ ((void) argc);
+ ((void) argv);
+
+#if defined(POLARSSL_DEBUG_C)
+ debug_set_threshold( DEBUG_LEVEL );
+#endif
+
+ /*
+ * 0. Initialize the RNG and the session data
+ */
+ memset( &ssl, 0, sizeof( ssl_context ) );
+ x509_crt_init( &cacert );
+
+ printf( "\n . Seeding the random number generator..." );
+ fflush( stdout );
+
+ entropy_init( &entropy );
+ if( ( ret = ctr_drbg_init( &ctr_drbg, entropy_func, &entropy,
+ (const unsigned char *) pers,
+ strlen( pers ) ) ) != 0 )
+ {
+ printf( " failed\n ! ctr_drbg_init returned %d\n", ret );
+ goto exit;
+ }
+
+ printf( " ok\n" );
+
+ /*
+ * 0. Initialize certificates
+ */
+ printf( " . Loading the CA root certificate ..." );
+ fflush( stdout );
+
+#if defined(POLARSSL_CERTS_C)
+ ret = x509_crt_parse( &cacert, (const unsigned char *) test_ca_list,
+ strlen( test_ca_list ) );
+#else
+ ret = 1;
+ printf("POLARSSL_CERTS_C not defined.");
+#endif
+
+ if( ret < 0 )
+ {
+ printf( " failed\n ! x509_crt_parse returned -0x%x\n\n", -ret );
+ goto exit;
+ }
+
+ printf( " ok (%d skipped)\n", ret );
+
+ /*
+ * 1. Start the connection
+ */
+ printf( " . Connecting to udp/%s/%4d...", SERVER_NAME,
+ SERVER_PORT );
+ fflush( stdout );
+
+ if( ( ret = net_connect( &server_fd, SERVER_ADDR,
+ SERVER_PORT, NET_PROTO_UDP ) ) != 0 )
+ {
+ printf( " failed\n ! net_connect returned %d\n\n", ret );
+ goto exit;
+ }
+
+ printf( " ok\n" );
+
+ /*
+ * 2. Setup stuff
+ */
+ printf( " . Setting up the DTLS structure..." );
+ fflush( stdout );
+
+ if( ( ret = ssl_init( &ssl ) ) != 0 )
+ {
+ printf( " failed\n ! ssl_init returned %d\n\n", ret );
+ goto exit;
+ }
+
+ printf( " ok\n" );
+
+ ssl_set_endpoint( &ssl, SSL_IS_CLIENT );
+ ssl_set_transport( &ssl, SSL_TRANSPORT_DATAGRAM );
+
+ /* OPTIONAL is usually a bad choice for security, but makes interop easier
+ * in this simplified example, in which the ca chain is hardcoded.
+ * Production code should set a proper ca chain and use REQUIRED. */
+ ssl_set_authmode( &ssl, SSL_VERIFY_OPTIONAL );
+ ssl_set_ca_chain( &ssl, &cacert, NULL, SERVER_NAME );
+
+ ssl_set_rng( &ssl, ctr_drbg_random, &ctr_drbg );
+ ssl_set_dbg( &ssl, my_debug, stdout );
+
+ ssl_set_bio_timeout( &ssl, &server_fd,
+ net_send, net_recv, net_recv_timeout,
+ READ_TIMEOUT_MS );
+
+ /*
+ * 4. Handshake
+ */
+ printf( " . Performing the SSL/TLS handshake..." );
+ fflush( stdout );
+
+ do ret = ssl_handshake( &ssl );
+ while( ret == POLARSSL_ERR_NET_WANT_READ ||
+ ret == POLARSSL_ERR_NET_WANT_WRITE );
+
+ if( ret != 0 )
+ {
+ printf( " failed\n ! ssl_handshake returned -0x%x\n\n", -ret );
+ goto exit;
+ }
+
+ printf( " ok\n" );
+
+ /*
+ * 5. Verify the server certificate
+ */
+ printf( " . Verifying peer X.509 certificate..." );
+
+ /* In real life, we would have used SSL_VERIFY_REQUIRED so that the
+ * handshake would not succeed if the peer's cert is bad. Even if we used
+ * SSL_VERIFY_OPTIONAL, we would bail out here if ret != 0 */
+ if( ( ret = ssl_get_verify_result( &ssl ) ) != 0 )
+ {
+ printf( " failed\n" );
+
+ if( ( ret & BADCERT_EXPIRED ) != 0 )
+ printf( " ! server certificate has expired\n" );
+
+ if( ( ret & BADCERT_REVOKED ) != 0 )
+ printf( " ! server certificate has been revoked\n" );
+
+ if( ( ret & BADCERT_CN_MISMATCH ) != 0 )
+ printf( " ! CN mismatch (expected CN=%s)\n", SERVER_NAME );
+
+ if( ( ret & BADCERT_NOT_TRUSTED ) != 0 )
+ printf( " ! self-signed or not signed by a trusted CA\n" );
+
+ printf( "\n" );
+ }
+ else
+ printf( " ok\n" );
+
+ /*
+ * 6. Write the echo request
+ */
+send_request:
+ printf( " > Write to server:" );
+ fflush( stdout );
+
+ len = sizeof( MESSAGE ) - 1;
+
+ do ret = ssl_write( &ssl, (unsigned char *) MESSAGE, len );
+ while( ret == POLARSSL_ERR_NET_WANT_READ ||
+ ret == POLARSSL_ERR_NET_WANT_WRITE );
+
+ if( ret < 0 )
+ {
+ printf( " failed\n ! ssl_write returned %d\n\n", ret );
+ goto exit;
+ }
+
+ len = ret;
+ printf( " %d bytes written\n\n%s\n\n", len, MESSAGE );
+
+ /*
+ * 7. Read the echo response
+ */
+ printf( " < Read from server:" );
+ fflush( stdout );
+
+ len = sizeof( buf ) - 1;
+ memset( buf, 0, sizeof( buf ) );
+
+ do ret = ssl_read( &ssl, buf, len );
+ while( ret == POLARSSL_ERR_NET_WANT_READ ||
+ ret == POLARSSL_ERR_NET_WANT_WRITE );
+
+ if( ret <= 0 )
+ {
+ switch( ret )
+ {
+ case POLARSSL_ERR_NET_TIMEOUT:
+ printf( " timeout\n\n" );
+ if( retry_left-- > 0 )
+ goto send_request;
+ goto exit;
+
+ case POLARSSL_ERR_SSL_PEER_CLOSE_NOTIFY:
+ printf( " connection was closed gracefully\n" );
+ ret = 0;
+ goto close_notify;
+
+ default:
+ printf( " ssl_read returned -0x%x\n\n", -ret );
+ goto exit;
+ }
+ }
+
+ len = ret;
+ printf( " %d bytes read\n\n%s\n\n", len, buf );
+
+ /*
+ * 8. Done, cleanly close the connection
+ */
+close_notify:
+ printf( " . Closing the connection..." );
+
+ /* No error checking, the connection might be closed already */
+ do ret = ssl_close_notify( &ssl );
+ while( ret == POLARSSL_ERR_NET_WANT_WRITE );
+ ret = 0;
+
+ printf( " done\n" );
+
+ /*
+ * 9. Final clean-ups and exit
+ */
+exit:
+
+#ifdef POLARSSL_ERROR_C
+ if( ret != 0 )
+ {
+ char error_buf[100];
+ polarssl_strerror( ret, error_buf, 100 );
+ printf( "Last error was: %d - %s\n\n", ret, error_buf );
+ }
+#endif
+
+ if( server_fd != -1 )
+ net_close( server_fd );
+
+ x509_crt_free( &cacert );
+ ssl_free( &ssl );
+ ctr_drbg_free( &ctr_drbg );
+ entropy_free( &entropy );
+
+#if defined(_WIN32)
+ printf( " + Press Enter to exit this program.\n" );
+ fflush( stdout ); getchar();
+#endif
+
+ /* Shell can not handle large exit numbers -> 1 for errors */
+ if( ret < 0 )
+ ret = 1;
+
+ return( ret );
+}
+#endif /* POLARSSL_SSL_CLI_C && POLARSSL_SSL_PROTO_DTLS && POLARSSL_NET_C &&
+ POLARSSL_ENTROPY_C && POLARSSL_CTR_DRBG_C &&
+ POLARSSL_X509_CRT_PARSE_C && POLARSSL_RSA_C && POLARSSL_CERTS_C */