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wolfssl-examples/project1/dtls_secured_multithreaded/server-dtls-threaded.c

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/* server-dtls-threaded.c
*
* Copyright (C) 2006-2014 wolfSSL Inc.
*
* This file is part of CyaSSL.
*
* CyaSSL 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.
*
* CyaSSL 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. and multi-threading
*/
#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 <cyassl/ssl.h>
#include <errno.h>
#include <signal.h>
#include <unistd.h>
#include <pthread.h>
#define SERV_PORT 11111 /* define our server port number */
#define MSGLEN 4096
struct sockaddr_in servaddr; /* our server's address */
struct sockaddr_in cliaddr; /* the client's address */
static int cleanup; /* To handle shutdown */
CYASSL_CTX* ctx;
void AwaitDGram();
void* ThreadControl(void*);
void sig_handler(const int sig)
{
printf("\nSIGINT handled.\n");
CyaSSL_Cleanup();
cleanup = 1;
}
void AwaitDGram()
{
int listenfd = 0; /* Initialize our socket */
socklen_t clilen; /* length of address' */
while (cleanup != 1) {
if ( (listenfd = socket(AF_INET, SOCK_DGRAM, 0) ) < 0 ) {
printf("Cannot create socket.\n");
cleanup = 1;
break;
}
printf("Socket allocated\n");
/* INADDR_ANY=IPaddr, socket = 11111, modify SERV_PORT to change */
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 */
int res = 1;
int on = 1;
socklen_t len = sizeof(on);
res = setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &on, len);
if (res < 0) {
printf("Setsockopt SO_REUSEADDR failed.\n");
cleanup = 1;
break;
}
/*Bind Socket*/
if (bind(listenfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) < 0) {
printf("Bind failed.\n");
cleanup = 1;
break;
}
printf("Socket bind complete\n");
printf("Awaiting client connection on port %d\n", SERV_PORT);
clilen = sizeof(cliaddr); /* set clilen to |cliaddr| */
unsigned char b[1500];
int connfd = 0;
connfd = (int)recvfrom(listenfd, (char *)&b, sizeof(b), MSG_PEEK,
(struct sockaddr*)&cliaddr, &clilen);
if (connfd < 0){
printf("No clients in que, enter idle state\n");
continue;
}
else if (connfd > 0) {
pthread_t threadID;
if (pthread_create(&threadID, NULL,
ThreadControl, (void *)&connfd) < 0) {
printf("pthread_create failed.\n");
}
printf("Connection being re-routed to Thread Control.\n");
}
else {
printf("Recvfrom failed.\n");
cleanup = 1;
}
pthread_t threadID = pthread_self();
pthread_join(threadID, (void*)&connfd);
sleep(1);
continue;
}
}
void* ThreadControl(void* openSock)
{
pthread_detach(pthread_self());
char ack[] = "I hear you fashizzle!\n";
int listenfd = 0;
socklen_t clilen; /* length of address' */
int recvlen = 0; /* length of message */
char buff[MSGLEN]; /* the incoming message */
if ( (listenfd = socket(AF_INET, SOCK_DGRAM, 0) ) < 0 ) {
printf("Cannot create socket.\n");
cleanup = 1;
}
/* INADDR_ANY=IPaddr, socket = 11111, modify SERV_PORT to change */
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 */
int res = 1;
int on = 1;
socklen_t len = sizeof(on);
res = setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &on, len);
if (res < 0) {
printf("Setsockopt SO_REUSEADDR failed.\n");
cleanup = 1;
}
/*Bind Socket*/
if (bind(listenfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) < 0) {
printf("Bind failed.\n");
cleanup = 1;
}
CYASSL* ssl; /* initialize arg */
clilen = sizeof(cliaddr); /* set clilen to |cliaddr| */
unsigned char b[1500];
int connfd = 0;
connfd = (int)recvfrom(listenfd, (char *)&b, sizeof(b), MSG_PEEK,
(struct sockaddr*)&cliaddr, &clilen);
if (connfd < 0){
printf("No clients in que, enter idle state\n");
}
else if (connfd > 0) {
if (connect(listenfd, (const struct sockaddr *)&cliaddr,
sizeof(cliaddr)) != 0) {
printf("Udp connect failed.\n");
cleanup = 1;
}
}
else {
printf("Recvfrom failed.\n");
cleanup = 1;
}
printf("Connected!\n");
/* Create the CYASSL Object */
if (( ssl = CyaSSL_new(ctx) ) == NULL) {
printf("CyaSSL_new error.\n");
cleanup = 1;
}
/* set the session ssl to client connection port */
CyaSSL_set_fd(ssl, listenfd);
if (CyaSSL_accept(ssl) != SSL_SUCCESS) {
int err = CyaSSL_get_error(ssl, 0);
char buffer[80];
printf("error = %d, %s\n", err, CyaSSL_ERR_error_string(err, buffer));
buffer[80]= 0;
printf("SSL_accept failed.\n");
cleanup = 1;
}
if (( recvlen = CyaSSL_read(ssl, buff, sizeof(buff)-1)) > 0){
printf("heard %d bytes\n", recvlen);
buff[recvlen] = 0;
printf("I heard this: \"%s\"\n", buff);
}
if (recvlen < 0) {
int readErr = CyaSSL_get_error(ssl, 0);
if(readErr != SSL_ERROR_WANT_READ) {
printf("SSL_read failed.\n");
cleanup = 1;
}
}
if (CyaSSL_write(ssl, ack, sizeof(ack)) < 0) {
printf("CyaSSL_write fail.\n");
cleanup = 1;
}
else
printf("Sending Reply...\n");
printf("reply sent \"%s\"\n", ack);
printf("No further packets, severing connection to client.\n");
CyaSSL_set_fd(ssl, 0);
CyaSSL_shutdown(ssl);
CyaSSL_free(ssl);
printf("Returning to idle state\n");
int dummy;
pthread_exit((void*)&dummy);
}
int main(int argc, char** argv)
{
struct sigaction act, oact; /* structures for signal handling */
/*
* Define a signal handler for when the user closes the program
* with Ctrl-C. Also, turn off SA_RESTART so that the OS doesn't
* restart the call to accept() after the signal is handled.
*/
act.sa_handler = sig_handler;
sigemptyset(&act.sa_mask);
act.sa_flags = 0;
sigaction(SIGINT, &act, &oact);
// CyaSSL_Debugging_ON();
CyaSSL_Init(); /* Initialize CyaSSL */
if ( (ctx = CyaSSL_CTX_new(CyaDTLSv1_2_server_method())) == NULL){
fprintf(stderr, "CyaSSL_CTX_new error.\n");
exit(EXIT_FAILURE);
}
printf("CTX set to DTLS 1.2\n");
if (CyaSSL_CTX_load_verify_locations(ctx,"../certs/ca-cert.pem",0) !=
SSL_SUCCESS) {
fprintf(stderr, "Error loading ../certs/ca-cert.pem, "
"please check the file.\n");
exit(EXIT_FAILURE);
}
printf("Loaded CA certs\n");
if (CyaSSL_CTX_use_certificate_file(ctx,"../certs/server-cert.pem",
SSL_FILETYPE_PEM) != SSL_SUCCESS) {
fprintf(stderr, "Error loading ../certs/server-cert.pem, "
"please check the file.\n");
exit(EXIT_FAILURE);
}
printf("Loaded server certs\n");
if (CyaSSL_CTX_use_PrivateKey_file(ctx,"../certs/server-key.pem",
SSL_FILETYPE_PEM) != SSL_SUCCESS) {
fprintf(stderr, "Error loading ../certs/server-key.pem, "
"please check the file.\n");
exit(EXIT_FAILURE);
}
printf("Loaded server keys\n");
AwaitDGram();
if (cleanup == 1){
CyaSSL_Cleanup();
CyaSSL_CTX_free(ctx);
}
return(0);
}
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