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Add server-tls-writedup.c example

pull/329/head
Eric Blankenhorn 2022-07-22 15:13:17 -05:00
parent 6b24ea805f
commit 25dd758cad
3 changed files with 255 additions and 4 deletions
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1
.gitignore vendored
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@ -105,6 +105,7 @@ android/wolfssljni-ndk-sample/proguard-project.txt
/tls/client-tls-pkcallback
/tls/server-tls-uart
/tls/server-tls-verifycallback
/tls/server-tls-writedup

11
tls/README.md
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@ -132,19 +132,20 @@ If you have installed wolfSSL in another location, edit `Makefile` so that the
`LIB_PATH` variable reflects this.
If you have configured wolfSSL to use static linking, comment out the line
```makefile
LIBS+=$(DYN_LIB)
```
and uncomment the line
```makefile
#LIBS+=$(STATIC_LIB)
```
to statically link against wolfSSL in these examples.
For `client-tls-writedup`, it is required that wolfSSL be configured with the
`--enable-writedup` flag. Remember to build and install wolfSSL after
configuring it with this flag.
For `client-tls-writedup` and `server-tls-writedup`, it is required that
wolfSSL be configured with the `--enable-writedup` flag. Remember to build
and install wolfSSL after configuring it with this flag.
## <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.
* `server-tls-callback`
* `server-tls-nonblocking`
* `server-tls-threaded`
* `server-tls-writedup`
@ -1074,6 +1076,7 @@ when this program is run we should see a number of "my\_OISend: sent" and
* `server-tls-callback`
* `server-tls-nonblocking`
* `server-tls-threaded`
* `server-tls-writedup`

247
tls/server-tls-writedup.c 100644
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@ -0,0 +1,247 @@
/* server-tls-writedup.c
*
* Copyright (C) 2006-2022 wolfSSL Inc.
*
* This file is part of wolfSSL. (formerly known as CyaSSL)
*
* wolfSSL 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.
*
* wolfSSL 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
*/
/* the usual suspects */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
/* socket includes */
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <unistd.h>
/* wolfSSL */
#include <wolfssl/options.h>
#include <wolfssl/ssl.h>
#define DEFAULT_PORT 11111
#define CERT_FILE "../certs/server-cert.pem"
#define KEY_FILE "../certs/server-key.pem"
int main()
{
int ret;
#ifdef HAVE_WRITE_DUP
int sockfd = SOCKET_INVALID;
int connd = SOCKET_INVALID;
struct sockaddr_in servAddr;
struct sockaddr_in clientAddr;
socklen_t size = sizeof(clientAddr);
char buff[256];
size_t len;
int shutdown = 0;
const char* reply = "I hear ya fa shizzle!\n";
/* declare wolfSSL objects */
WOLFSSL_CTX* ctx = NULL;
WOLFSSL *ssl = NULL, *write_ssl = NULL;
#ifdef DEBUG_WOLFSSL
wolfSSL_Debugging_ON();
#endif
/* Initialize wolfSSL */
wolfSSL_Init();
/* Create a socket that uses an internet IPv4 address,
* Sets the socket to be stream based (TCP),
* 0 means choose the default protocol. */
if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
fprintf(stderr, "ERROR: failed to create the socket\n");
ret = -1;
goto exit;
}
/* Create and initialize WOLFSSL_CTX */
if ((ctx = wolfSSL_CTX_new(wolfSSLv23_method())) == NULL) {
fprintf(stderr, "ERROR: failed to create WOLFSSL_CTX\n");
ret = -1;
goto exit;
}
/* Load server certificates into WOLFSSL_CTX */
if ((ret = wolfSSL_CTX_use_certificate_file(ctx, CERT_FILE, SSL_FILETYPE_PEM))
!= WOLFSSL_SUCCESS) {
fprintf(stderr, "ERROR: failed to load %s, please check the file.\n",
CERT_FILE);
goto exit;
}
/* Load server key into WOLFSSL_CTX */
if ((ret = wolfSSL_CTX_use_PrivateKey_file(ctx, KEY_FILE, SSL_FILETYPE_PEM))
!= WOLFSSL_SUCCESS) {
fprintf(stderr, "ERROR: failed to load %s, please check the file.\n",
KEY_FILE);
goto exit;
}
/* Set the protocol min / max */
wolfSSL_CTX_set_min_proto_version(ctx, TLS1_2_VERSION);
wolfSSL_CTX_set_max_proto_version(ctx, TLS1_3_VERSION);
/* Initialize the server address struct with zeros */
memset(&servAddr, 0, sizeof(servAddr));
/* Fill in the server address */
servAddr.sin_family = AF_INET; /* using IPv4 */
servAddr.sin_port = htons(DEFAULT_PORT); /* on DEFAULT_PORT */
servAddr.sin_addr.s_addr = INADDR_ANY; /* from anywhere */
/* Bind the server socket to our port */
if (bind(sockfd, (struct sockaddr*)&servAddr, sizeof(servAddr)) == -1) {
fprintf(stderr, "ERROR: failed to bind\n");
ret = -1;
goto exit;
}
/* Listen for a new connection, allow 5 pending connections */
if (listen(sockfd, 5) == -1) {
fprintf(stderr, "ERROR: failed to listen\n");
ret = -1;
goto exit;
}
/* Continue to accept clients until shutdown is issued */
while (!shutdown) {
printf("Waiting for a connection...\n");
/* Accept client connections */
if ((connd = accept(sockfd, (struct sockaddr*)&clientAddr, &size))
== -1) {
fprintf(stderr, "ERROR: failed to accept the connection\n\n");
ret = -1;
goto exit;
}
/* Create a WOLFSSL object */
if ((ssl = wolfSSL_new(ctx)) == NULL) {
fprintf(stderr, "ERROR: failed to create WOLFSSL object\n");
ret = -1;
goto exit;
}
/* Attach wolfSSL to the socket */
wolfSSL_set_fd(ssl, connd);
/* Establish TLS connection */
ret = wolfSSL_accept(ssl);
if (ret != WOLFSSL_SUCCESS) {
fprintf(stderr, "wolfSSL_accept error = %d\n",
wolfSSL_get_error(ssl, ret));
goto exit;
}
printf("Client connected successfully\n");
write_ssl = wolfSSL_write_dup(ssl);
if (write_ssl == NULL) {
fprintf(stderr, "wolfSSL_write_dup failed\n");
ret = -1;
goto exit;
}
{
int w_ver = wolfSSL_version(write_ssl);
int r_ver = wolfSSL_version(ssl);
if (w_ver != r_ver) {
fprintf(stderr, "ERROR: SSL versions are different\n");
goto exit;
}
}
/* Read the client data into our buff array */
memset(buff, 0, sizeof(buff));
if ((ret = wolfSSL_read(ssl, buff, sizeof(buff)-1)) == -1) {
fprintf(stderr, "ERROR: failed to read\n");
goto exit;
}
/* Print to stdout any data the client sends */
printf("Client: %s\n", buff);
/* Check for server shutdown command */
if (strncmp(buff, "shutdown", 8) == 0) {
printf("Shutdown command issued!\n");
shutdown = 1;
}
/* Write our reply into buff */
memset(buff, 0, sizeof(buff));
memcpy(buff, reply, strlen(reply));
len = strnlen(buff, sizeof(buff));
/* Reply back to the client */
if ((ret = wolfSSL_write(write_ssl, buff, len)) != len) {
fprintf(stderr, "ERROR: failed to write\n");
goto exit;
}
/* Notify the client that the connection is ending */
wolfSSL_shutdown(write_ssl);
wolfSSL_shutdown(ssl);
printf("Shutdown complete\n");
/* Cleanup after this connection */
wolfSSL_free(write_ssl);/* Free the dup wolfSSL object */
write_ssl = NULL;
wolfSSL_free(ssl); /* Free the wolfSSL object */
ssl = NULL;
close(connd); /* Close the connection to the client */
}
ret = 0;
exit:
/* Cleanup and return */
if (write_ssl) {
wolfSSL_free(write_ssl);/* Free the dup wolfSSL object */
write_ssl = NULL;
}
if (ssl)
wolfSSL_free(ssl); /* Free the wolfSSL object */
if (connd != SOCKET_INVALID)
close(connd); /* Close the connection to the client */
if (sockfd != SOCKET_INVALID)
close(sockfd); /* Close the socket listening for clients */
if (ctx)
wolfSSL_CTX_free(ctx); /* Free the wolfSSL context object */
wolfSSL_Cleanup(); /* Cleanup the wolfSSL environment */
#else
printf("wolfSSL not configured with --enable-writedup.\n"
"Please re-configure and re-install wolfSSL to try out"
"this example!\n");
#endif
return ret; /* Return reporting a success */
}