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wolfssl-examples/tls/server-tls-nonblocking.c

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/* server-tls-nonblocking.c
*
* Copyright (C) 2006-2020 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>
#include <errno.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>
#include <wolfssl/wolfio.h>
#define DEFAULT_PORT 11111
#define SELECT_WAIT_SEC 1
#define CERT_FILE "../certs/server-cert.pem"
#define KEY_FILE "../certs/server-key.pem"
enum {
TEST_SELECT_FAIL,
TEST_TIMEOUT,
TEST_RECV_READY,
TEST_SEND_READY,
TEST_ERROR_READY
};
static int tcp_select(SOCKET_T socketfd, int to_sec, int rx)
{
fd_set fds, errfds;
fd_set* recvfds = NULL;
fd_set* sendfds = NULL;
SOCKET_T nfds = socketfd + 1;
struct timeval timeout;
int result;
FD_ZERO(&fds);
FD_SET(socketfd, &fds);
FD_ZERO(&errfds);
FD_SET(socketfd, &errfds);
if (rx)
recvfds = &fds;
else
sendfds = &fds;
timeout.tv_sec = to_sec;
timeout.tv_usec = 0;
result = select(nfds, recvfds, sendfds, &errfds, &timeout);
if (result == 0)
return TEST_TIMEOUT;
else if (result > 0) {
if (FD_ISSET(socketfd, &fds)) {
if (rx)
return TEST_RECV_READY;
else
return TEST_SEND_READY;
}
else if (FD_ISSET(socketfd, &errfds))
return TEST_ERROR_READY;
}
return TEST_SELECT_FAIL;
}
int main()
{
int ret, err;
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;
/* Initialize wolfSSL */
wolfSSL_Init();
//wolfSSL_Debugging_ON();
/* 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;
}
/* Set the socket options to use nonblocking I/O */
if (fcntl(sockfd, F_SETFL, O_NONBLOCK) == -1) {
fprintf(stderr, "ERROR: failed to set socket options\n");
ret = -1;
goto exit;
}
/* Create and initialize WOLFSSL_CTX */
#ifdef USE_TLSV13
ctx = wolfSSL_CTX_new(wolfTLSv1_3_server_method());
#else
ctx = wolfSSL_CTX_new(wolfTLSv1_2_server_method());
#endif
if (ctx == 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, WOLFSSL_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 (wolfSSL_CTX_use_PrivateKey_file(ctx, KEY_FILE, WOLFSSL_FILETYPE_PEM)
!= WOLFSSL_SUCCESS) {
fprintf(stderr, "ERROR: failed to load %s, please check the file.\n",
KEY_FILE);
ret = -1;
goto exit;
}
/* 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 */
while ((connd = accept(sockfd, (struct sockaddr*)&clientAddr, &size))
== -1) {
if (errno == EAGAIN || errno == EWOULDBLOCK) {
/* non-blocking, wait for read activity on socket */
tcp_select(sockfd, SELECT_WAIT_SEC, 1);
continue;
}
else if (errno == EINPROGRESS || errno == EALREADY) {
break;
}
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 */
if ((ret = wolfSSL_set_fd(ssl, connd)) != WOLFSSL_SUCCESS) {
fprintf(stderr, "ERROR: Failed to set the file descriptor\n");
goto exit;
}
/* Establish TLS connection */
printf("wolfSSL_accepting\n");
do {
ret = wolfSSL_accept(ssl);
err = wolfSSL_get_error(ssl, ret);
if (err == WOLFSSL_ERROR_WANT_READ)
tcp_select(sockfd, SELECT_WAIT_SEC, 1);
} while (err == WOLFSSL_ERROR_WANT_READ || err == WOLFSSL_ERROR_WANT_WRITE);
if (ret != WOLFSSL_SUCCESS) {
fprintf(stderr, "wolfSSL_accept error %d (%d)\n", err, ret);
goto exit;
}
printf("client connected successfully\n");
/* read the client data into our buff array */
memset(buff, 0, sizeof(buff));
do {
ret = wolfSSL_read(ssl, buff, sizeof(buff)-1);
err = wolfSSL_get_error(ssl, ret);
if (err == WOLFSSL_ERROR_WANT_READ)
tcp_select(sockfd, SELECT_WAIT_SEC, 1);
}
while (err == WOLFSSL_ERROR_WANT_READ);
if (ret < 0) {
fprintf(stderr, "ERROR %d: failed to read\n", ret);
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 */
do {
ret = wolfSSL_write(ssl, reply, len);
err = wolfSSL_get_error(ssl, ret);
sleep(1);
}
while (err == WOLFSSL_ERROR_WANT_WRITE);
if (ret < 0) {
fprintf(stderr, "ERROR %d: failed to write\n", ret);
goto exit;
}
/* send close notify */
do {
ret = wolfSSL_shutdown(ssl);
err = wolfSSL_get_error(ssl, 0);
if (err == WOLFSSL_ERROR_WANT_READ)
tcp_select(sockfd, SELECT_WAIT_SEC, 1);
} while (err == WOLFSSL_ERROR_WANT_READ || err == WOLFSSL_ERROR_WANT_WRITE);
/* Cleanup after this connection */
wolfSSL_free(ssl); /* Free the wolfSSL object */
ssl = NULL;
close(connd); /* Close the connection to the client */
connd = SOCKET_INVALID;
}
printf("Shutdown complete\n");
ret = 0;
exit:
/* Cleanup and return */
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 */
return ret;
}
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