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wolfssl-examples/dtls/server-dtls.c

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/* server-dtls.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
*
*=============================================================================
*
* Bare-bones example of a DTLS server for instructional/learning purposes.
* Utilizes DTLS 1.2.
*/
#include <wolfssl/options.h>
#include <wolfssl/ssl.h>
#include <stdio.h> /* standard in/out procedures */
#include <stdlib.h> /* defines system calls */
#include <string.h> /* necessary for memset */
#include <netdb.h>
#include <sys/socket.h> /* used for all socket calls */
#include <netinet/in.h> /* used for sockaddr_in */
#include <arpa/inet.h>
#include <errno.h>
#include <signal.h>
#include <unistd.h>
#define SERV_PORT 11111 /* define our server port number */
#define MSGLEN 4096
static int cleanup = 0; /* To handle shutdown */
static struct sockaddr_in servAddr; /* our server's address */
static struct sockaddr_in cliaddr; /* the client's address */
void sig_handler(const int sig);
int main(int argc, char** argv)
{
/* Loc short for "location" */
char caCertLoc[] = "../certs/ca-cert.pem";
char servCertLoc[] = "../certs/server-cert.pem";
char servKeyLoc[] = "../certs/server-key.pem";
int ret = 0;
WOLFSSL_CTX* ctx;
/* Variables for awaiting datagram */
int on = 1;
int res = 1;
int bytesReceived = 0;
int recvLen = 0; /* length of message */
int listenfd = 0; /* Initialize our socket */
WOLFSSL* ssl = NULL;
socklen_t cliLen;
socklen_t len = sizeof(int);
unsigned char b[MSGLEN]; /* watch for incoming messages */
char buff[MSGLEN]; /* the incoming message */
char ack[] = "I hear you fashizzle!\n";
/* "./config --enable-debug" and uncomment next line for debugging */
/* wolfSSL_Debugging_ON(); */
/* Initialize wolfSSL */
wolfSSL_Init();
/* Set ctx to DTLS 1.2 */
ctx = wolfSSL_CTX_new(wolfDTLSv1_2_server_method());
if (ctx == NULL) {
printf("wolfSSL_CTX_new error.\n");
return 1;
}
/* Load CA certificates */
ret = wolfSSL_CTX_load_verify_locations(ctx,caCertLoc,0);
if (ret != SSL_SUCCESS) {
printf("Error loading %s, please check the file.\n", caCertLoc);
return 1;
}
/* Load server certificates */
ret = wolfSSL_CTX_use_certificate_file(ctx, servCertLoc, SSL_FILETYPE_PEM);
if (ret != SSL_SUCCESS) {
printf("Error loading %s, please check the file.\n", servCertLoc);
return 1;
}
/* Load server Keys */
ret = wolfSSL_CTX_use_PrivateKey_file(ctx, servKeyLoc, SSL_FILETYPE_PEM);
if (ret != SSL_SUCCESS) {
printf("Error loading %s, please check the file.\n", servKeyLoc);
return 1;
}
/* Await Datagram */
;
while (cleanup != 1) {
/* Create a UDP/IP socket */
listenfd = socket(AF_INET, SOCK_DGRAM, 0);
if (listenfd <= 0 ) {
printf("error: cannot create socket: %d\n", listenfd);
break;
}
printf("info: socket allocated: %d\n", listenfd);
/* clear servAddr each loop */
memset((char *)&servAddr, 0, sizeof(servAddr));
/* host-to-network-long conversion (htonl) */
/* host-to-network-short conversion (htons) */
servAddr.sin_family = AF_INET;
servAddr.sin_addr.s_addr = htonl(INADDR_ANY);
servAddr.sin_port = htons(SERV_PORT);
/* Eliminate socket already in use error */
res = setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &on, len);
if (res < 0) {
printf("Setsockopt SO_REUSEADDR failed.\n");
break;
}
/*Bind Socket*/
if (bind(listenfd, (struct sockaddr*)&servAddr, sizeof(servAddr)) < 0) {
printf("Bind failed.\n");
break;
}
printf("Awaiting client connection on port %d\n", SERV_PORT);
cliLen = sizeof(cliaddr);
bytesReceived = (int)recvfrom(listenfd, (char *)&b, sizeof(b), MSG_PEEK,
(struct sockaddr*)&cliaddr, &cliLen);
if (bytesReceived < 0) {
printf("No clients in que, enter idle state\n");
close(listenfd);
continue;
}
else if (bytesReceived > 0) {
if (connect(listenfd, (const struct sockaddr *)&cliaddr,
sizeof(cliaddr)) != 0) {
printf("Udp connect failed.\n");
break;
}
}
else {
printf("Recvfrom failed.\n");
break;
}
printf("Connected!\n");
/* Create the WOLFSSL Object */
if ((ssl = wolfSSL_new(ctx)) == NULL) {
printf("wolfSSL_new error.\n");
break;
}
#ifdef WOLFSSL_DTLS_SET_PEER
/* Alternative to UDP connect */
wolfSSL_dtls_set_peer(ssl, &cliaddr, cliLen);
#endif
/* set the session ssl to client connection port */
wolfSSL_set_fd(ssl, listenfd);
if (wolfSSL_accept(ssl) != SSL_SUCCESS) {
int e = wolfSSL_get_error(ssl, 0);
printf("error = %d, %s\n", e, wolfSSL_ERR_reason_error_string(e));
printf("SSL_accept failed.\n");
break;
}
while (1) {
if ((recvLen = wolfSSL_read(ssl, buff, sizeof(buff)-1)) > 0) {
printf("heard %d bytes\n", recvLen);
buff[recvLen] = 0;
printf("I heard this: \"%s\"\n", buff);
}
else if (recvLen < 0) {
int readErr = wolfSSL_get_error(ssl, 0);
if(readErr != SSL_ERROR_WANT_READ) {
printf("SSL_read failed.\n");
break;
}
}
if (wolfSSL_write(ssl, ack, sizeof(ack)) < 0) {
printf("wolfSSL_write fail.\n");
break;
}
else {
printf("Sending reply.\n");
}
}
printf("reply sent \"%s\"\n", ack);
wolfSSL_set_fd(ssl, 0);
wolfSSL_shutdown(ssl);
wolfSSL_free(ssl);
close(listenfd);
cleanup = 0;
printf("Client left cont to idle state\n");
}
if (cleanup == 1) {
wolfSSL_set_fd(ssl, 0);
wolfSSL_shutdown(ssl);
wolfSSL_free(ssl);
close(listenfd);
}
wolfSSL_CTX_free(ctx);
wolfSSL_Cleanup();
return 0;
}
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