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Add server-tls-writedup.c example
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‎.gitignore‎

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@@ -105,6 +105,7 @@ android/wolfssljni-ndk-sample/proguard-project.txt
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/tls/client-tls-pkcallback
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/tls/server-tls-uart
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/tls/server-tls-verifycallback
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/tls/server-tls-writedup
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‎tls/README.md‎

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@@ -132,19 +132,20 @@ If you have installed wolfSSL in another location, edit `Makefile` so that the
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`LIB_PATH` variable reflects this.
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If you have configured wolfSSL to use static linking, comment out the line
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```makefile
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LIBS+=$(DYN_LIB)
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```
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and uncomment the line
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```makefile
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#LIBS+=$(STATIC_LIB)
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```
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to statically link against wolfSSL in these examples.
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For `client-tls-writedup`, it is required that wolfSSL be configured with the
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`--enable-writedup` flag. Remember to build and install wolfSSL after
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configuring it with this flag.
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For `client-tls-writedup` and `server-tls-writedup`, it is required that
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wolfSSL be configured with the `--enable-writedup` flag. Remember to build
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and install wolfSSL after configuring it with this flag.
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## <a name="tcp">A simple TCP client/server pair</a>
@@ -905,6 +906,7 @@ And we're done. We should now have a fully functional TLS client.
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* `server-tls-callback`
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* `server-tls-nonblocking`
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* `server-tls-threaded`
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* `server-tls-writedup`
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@@ -1074,6 +1076,7 @@ when this program is run we should see a number of "my\_OISend: sent" and
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* `server-tls-callback`
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* `server-tls-nonblocking`
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* `server-tls-threaded`
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* `server-tls-writedup`
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‎tls/server-tls-writedup.c‎

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/* server-tls-writedup.c
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*
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* Copyright (C) 2006-2022 wolfSSL Inc.
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*
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* This file is part of wolfSSL. (formerly known as CyaSSL)
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*
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* wolfSSL is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* wolfSSL is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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/* the usual suspects */
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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/* socket includes */
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#include <unistd.h>
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/* wolfSSL */
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#include <wolfssl/options.h>
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#include <wolfssl/ssl.h>
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#define DEFAULT_PORT 11111
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#define CERT_FILE "../certs/server-cert.pem"
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#define KEY_FILE "../certs/server-key.pem"
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int main()
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{
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int ret;
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#ifdef HAVE_WRITE_DUP
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int sockfd = SOCKET_INVALID;
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int connd = SOCKET_INVALID;
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struct sockaddr_in servAddr;
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struct sockaddr_in clientAddr;
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socklen_t size = sizeof(clientAddr);
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char buff[256];
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size_t len;
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int shutdown = 0;
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const char* reply = "I hear ya fa shizzle!\n";
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/* declare wolfSSL objects */
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WOLFSSL_CTX* ctx = NULL;
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WOLFSSL *ssl = NULL, *write_ssl = NULL;
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#ifdef DEBUG_WOLFSSL
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wolfSSL_Debugging_ON();
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#endif
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/* Initialize wolfSSL */
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wolfSSL_Init();
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/* Create a socket that uses an internet IPv4 address,
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* Sets the socket to be stream based (TCP),
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* 0 means choose the default protocol. */
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if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
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fprintf(stderr, "ERROR: failed to create the socket\n");
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ret = -1;
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goto exit;
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}
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/* Create and initialize WOLFSSL_CTX */
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if ((ctx = wolfSSL_CTX_new(wolfSSLv23_method())) == NULL) {
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fprintf(stderr, "ERROR: failed to create WOLFSSL_CTX\n");
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ret = -1;
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goto exit;
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}
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/* Load server certificates into WOLFSSL_CTX */
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if ((ret = wolfSSL_CTX_use_certificate_file(ctx, CERT_FILE, SSL_FILETYPE_PEM))
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!= WOLFSSL_SUCCESS) {
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fprintf(stderr, "ERROR: failed to load %s, please check the file.\n",
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CERT_FILE);
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goto exit;
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}
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/* Load server key into WOLFSSL_CTX */
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if ((ret = wolfSSL_CTX_use_PrivateKey_file(ctx, KEY_FILE, SSL_FILETYPE_PEM))
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!= WOLFSSL_SUCCESS) {
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fprintf(stderr, "ERROR: failed to load %s, please check the file.\n",
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KEY_FILE);
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goto exit;
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}
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/* Set the protocol min / max */
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wolfSSL_CTX_set_min_proto_version(ctx, TLS1_2_VERSION);
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wolfSSL_CTX_set_max_proto_version(ctx, TLS1_3_VERSION);
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/* Initialize the server address struct with zeros */
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memset(&servAddr, 0, sizeof(servAddr));
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/* Fill in the server address */
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servAddr.sin_family = AF_INET; /* using IPv4 */
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servAddr.sin_port = htons(DEFAULT_PORT); /* on DEFAULT_PORT */
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servAddr.sin_addr.s_addr = INADDR_ANY; /* from anywhere */
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/* Bind the server socket to our port */
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if (bind(sockfd, (struct sockaddr*)&servAddr, sizeof(servAddr)) == -1) {
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fprintf(stderr, "ERROR: failed to bind\n");
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ret = -1;
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goto exit;
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}
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/* Listen for a new connection, allow 5 pending connections */
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if (listen(sockfd, 5) == -1) {
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fprintf(stderr, "ERROR: failed to listen\n");
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ret = -1;
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goto exit;
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}
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/* Continue to accept clients until shutdown is issued */
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while (!shutdown) {
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printf("Waiting for a connection...\n");
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/* Accept client connections */
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if ((connd = accept(sockfd, (struct sockaddr*)&clientAddr, &size))
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== -1) {
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fprintf(stderr, "ERROR: failed to accept the connection\n\n");
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ret = -1;
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goto exit;
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}
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/* Create a WOLFSSL object */
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if ((ssl = wolfSSL_new(ctx)) == NULL) {
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fprintf(stderr, "ERROR: failed to create WOLFSSL object\n");
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ret = -1;
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goto exit;
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}
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/* Attach wolfSSL to the socket */
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wolfSSL_set_fd(ssl, connd);
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/* Establish TLS connection */
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ret = wolfSSL_accept(ssl);
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if (ret != WOLFSSL_SUCCESS) {
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fprintf(stderr, "wolfSSL_accept error = %d\n",
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wolfSSL_get_error(ssl, ret));
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goto exit;
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}
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printf("Client connected successfully\n");
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write_ssl = wolfSSL_write_dup(ssl);
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if (write_ssl == NULL) {
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fprintf(stderr, "wolfSSL_write_dup failed\n");
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ret = -1;
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goto exit;
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}
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{
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int w_ver = wolfSSL_version(write_ssl);
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int r_ver = wolfSSL_version(ssl);
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if (w_ver != r_ver) {
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fprintf(stderr, "ERROR: SSL versions are different\n");
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goto exit;
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}
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}
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/* Read the client data into our buff array */
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memset(buff, 0, sizeof(buff));
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if ((ret = wolfSSL_read(ssl, buff, sizeof(buff)-1)) == -1) {
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fprintf(stderr, "ERROR: failed to read\n");
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goto exit;
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}
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/* Print to stdout any data the client sends */
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printf("Client: %s\n", buff);
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/* Check for server shutdown command */
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if (strncmp(buff, "shutdown", 8) == 0) {
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printf("Shutdown command issued!\n");
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shutdown = 1;
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}
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/* Write our reply into buff */
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memset(buff, 0, sizeof(buff));
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memcpy(buff, reply, strlen(reply));
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len = strnlen(buff, sizeof(buff));
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/* Reply back to the client */
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if ((ret = wolfSSL_write(write_ssl, buff, len)) != len) {
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fprintf(stderr, "ERROR: failed to write\n");
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goto exit;
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}
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/* Notify the client that the connection is ending */
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wolfSSL_shutdown(write_ssl);
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wolfSSL_shutdown(ssl);
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printf("Shutdown complete\n");
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/* Cleanup after this connection */
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wolfSSL_free(write_ssl);/* Free the dup wolfSSL object */
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write_ssl = NULL;
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wolfSSL_free(ssl); /* Free the wolfSSL object */
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ssl = NULL;
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close(connd); /* Close the connection to the client */
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}
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ret = 0;
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exit:
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/* Cleanup and return */
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if (write_ssl) {
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wolfSSL_free(write_ssl);/* Free the dup wolfSSL object */
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write_ssl = NULL;
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}
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if (ssl)
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wolfSSL_free(ssl); /* Free the wolfSSL object */
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if (connd != SOCKET_INVALID)
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close(connd); /* Close the connection to the client */
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if (sockfd != SOCKET_INVALID)
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close(sockfd); /* Close the socket listening for clients */
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if (ctx)
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wolfSSL_CTX_free(ctx); /* Free the wolfSSL context object */
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wolfSSL_Cleanup(); /* Cleanup the wolfSSL environment */
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#else
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printf("wolfSSL not configured with --enable-writedup.\n"
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"Please re-configure and re-install wolfSSL to try out"
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"this example!\n");
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#endif
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return ret; /* Return reporting a success */
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}

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