multi-threaded, nonblocking dtls server
Kaleb Himes
parent
ff587c4f6e
commit
91d80b6658
|
|
@ -0,0 +1,21 @@
|
|||
DEPS = ../include/unp.h
|
||||
CC=gcc
|
||||
CFLAGS=-Wall -I ../include -DCYASSL_DTLS
|
||||
OBJ = echoserver.o
|
||||
|
||||
#if you are on a sunOS (System V) machine, you'll need to uncomment
|
||||
#the next line.
|
||||
|
||||
#LIBS=-lsocket
|
||||
%.o: %.c $(DEPS)
|
||||
$(CC) -c -o $@ $< $(CFLAGS)
|
||||
all: server
|
||||
|
||||
server: server-dtls-nonblocking-threaded.c
|
||||
$(CC) -Wall -DCYASSL_DTLS -o server server-dtls-nonblocking-threaded.c -lcyassl -lpthread
|
||||
|
||||
|
||||
.PHONY: clean
|
||||
|
||||
clean:
|
||||
-rm -f *.o server
|
||||
|
|
@ -0,0 +1,428 @@
|
|||
/* server-dtls-nonblocking.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 non-blocking sockets
|
||||
*/
|
||||
|
||||
#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 <fcntl.h>
|
||||
#include <sys/time.h>
|
||||
#include <sys/select.h>
|
||||
#include <pthread.h>
|
||||
|
||||
#define SERV_PORT 11111 /* define our server port number */
|
||||
#define MSGLEN 4096
|
||||
|
||||
CYASSL_CTX* ctx;
|
||||
|
||||
static int cleanup; /* To handle shutdown */
|
||||
|
||||
static int dtls_select(socklen_t sockfd, int to_sec);
|
||||
|
||||
void *ThreadControl(void* openSock);
|
||||
|
||||
|
||||
|
||||
|
||||
void sig_handler(const int sig)
|
||||
{
|
||||
printf("\nSIGINT handled.\n");
|
||||
cleanup = 1;
|
||||
exit(0);
|
||||
}
|
||||
|
||||
static void err_sys(const char* msg)
|
||||
{
|
||||
printf("yassl error: %s\n", msg);
|
||||
if (msg)
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
|
||||
enum {
|
||||
TEST_SELECT_FAIL,
|
||||
TEST_TIMEOUT,
|
||||
TEST_RECV_READY,
|
||||
TEST_ERROR_READY
|
||||
};
|
||||
|
||||
static int dtls_select(socklen_t sockfd, int to_sec)
|
||||
{
|
||||
fd_set masterset, workingset;
|
||||
socklen_t maxfd = sockfd + 1;
|
||||
struct timeval timeout = { (to_sec > 0) ? to_sec : 0, 0};
|
||||
int result;
|
||||
|
||||
FD_ZERO(&masterset);
|
||||
FD_SET(sockfd, &masterset);
|
||||
FD_ZERO(&workingset);
|
||||
FD_SET(sockfd, &workingset);
|
||||
|
||||
/* Uncomment to make the timout a static 3 minutes */
|
||||
|
||||
/*
|
||||
timeout.tv_sec = 0;
|
||||
timeout.tv_usec = 0;
|
||||
*/
|
||||
|
||||
result = select(maxfd, &masterset, NULL, &workingset, &timeout);
|
||||
|
||||
if (result == 0)
|
||||
return TEST_TIMEOUT;
|
||||
else if (result > 0) {
|
||||
if (FD_ISSET(sockfd, &masterset))
|
||||
return TEST_RECV_READY;
|
||||
else if(FD_ISSET(sockfd, &workingset))
|
||||
return TEST_ERROR_READY;
|
||||
}
|
||||
|
||||
return TEST_SELECT_FAIL;
|
||||
}
|
||||
|
||||
void *ThreadControl(void* openSock)
|
||||
{
|
||||
char ack[] = "I hear you fashizzle!\n";
|
||||
int connfd = *(int*)openSock;
|
||||
CYASSL* ssl;
|
||||
printf("Connected with a client!\n");
|
||||
|
||||
/* Create the CYASSL Object */
|
||||
if (( ssl = CyaSSL_new(ctx) ) == NULL) {
|
||||
fprintf(stderr, "CyaSSL_new error.\n");
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
|
||||
|
||||
/* set the session ssl to client connection port */
|
||||
CyaSSL_set_fd(ssl, connfd);
|
||||
|
||||
|
||||
/* set listen port to nonblocking, accept nonblocking */
|
||||
/* handle peer error */
|
||||
CyaSSL_set_using_nonblock(ssl, 1);
|
||||
for (;;) {
|
||||
char buff[MSGLEN];
|
||||
int recvlen = 0;
|
||||
|
||||
bzero(&buff, sizeof(buff));
|
||||
|
||||
|
||||
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)
|
||||
err_sys("SSL_read failed");
|
||||
}
|
||||
|
||||
|
||||
if (CyaSSL_write(ssl, ack, sizeof(ack)) < 0) {
|
||||
err_sys("CyaSSL_write fail");
|
||||
}
|
||||
|
||||
else
|
||||
printf("Lost the connection to client\n");
|
||||
|
||||
printf("reply sent \"%s\"\n", ack);
|
||||
|
||||
|
||||
printf("Client left return to idle state\n");
|
||||
CyaSSL_set_fd(ssl, 0);
|
||||
CyaSSL_shutdown(ssl);
|
||||
CyaSSL_free(ssl);
|
||||
close(connfd);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
int main(int argc, char** argv)
|
||||
{
|
||||
/* CREATE THE SOCKET */
|
||||
|
||||
char ack[] = "I hear you fashizzle!";
|
||||
struct sockaddr_in servaddr; /* our server's address */
|
||||
struct sockaddr_in cliaddr; /* the client's address */
|
||||
int listenfd; /* Initialize our socket */
|
||||
socklen_t clilen; /* length of address' */
|
||||
int recvlen = 0; /* length of message */
|
||||
char buff[MSGLEN]; /* the incoming message */
|
||||
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");
|
||||
|
||||
|
||||
|
||||
/* BEGIN: avoid valgrind error when using DTLS v1.2 and AES */
|
||||
int ret;
|
||||
|
||||
ret = CyaSSL_CTX_set_cipher_list(ctx, "DES-CBC3-SHA");
|
||||
if(ret == SSL_SUCCESS)
|
||||
printf("ret successfully set to \"DES-CBC3-SHA\"\n");
|
||||
/* END: avoid valgrind error */
|
||||
|
||||
|
||||
|
||||
|
||||
while (cleanup != 1) {
|
||||
|
||||
if ( (listenfd = socket(AF_INET, SOCK_DGRAM, 0) ) < 0 ) {
|
||||
err_sys("cannot create socket");
|
||||
return 0;
|
||||
}
|
||||
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) {
|
||||
err_sys("setsockopt SO_REUSEADDR failed\n");
|
||||
}
|
||||
|
||||
|
||||
|
||||
/*Bind Socket*/
|
||||
if (bind(listenfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) < 0) {
|
||||
err_sys("bind failed");
|
||||
return 0;
|
||||
}
|
||||
printf("Socket bind complete\n");
|
||||
|
||||
|
||||
printf("Awaiting client connection on port %d\n", SERV_PORT);
|
||||
|
||||
/* set listenfd non-blocking */
|
||||
fcntl(res, F_SETFL, O_NONBLOCK);
|
||||
|
||||
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)
|
||||
err_sys("udp connect failed");
|
||||
}
|
||||
else err_sys("recvfrom failed");
|
||||
|
||||
|
||||
|
||||
|
||||
/* Create the CYASSL Object */
|
||||
if (( ssl = CyaSSL_new(ctx) ) == NULL) {
|
||||
fprintf(stderr, "CyaSSL_new error.\n");
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
|
||||
|
||||
/* set the session ssl to client connection port */
|
||||
CyaSSL_set_fd(ssl, listenfd);
|
||||
|
||||
|
||||
/* set listen port to nonblocking, accept nonblocking */
|
||||
/* handle peer error */
|
||||
CyaSSL_set_using_nonblock(ssl, 1);
|
||||
|
||||
|
||||
ret = CyaSSL_accept(ssl);
|
||||
int error = CyaSSL_get_error(ssl, 0);
|
||||
socklen_t sockfd = (socklen_t)CyaSSL_get_fd(ssl);
|
||||
int select_ret;
|
||||
|
||||
printf("ret = %d\n", ret);
|
||||
|
||||
|
||||
pthread_t threadID;
|
||||
|
||||
while (ret != SSL_SUCCESS && (error == SSL_ERROR_WANT_READ ||
|
||||
error == SSL_ERROR_WANT_WRITE)) {
|
||||
|
||||
int currTimeout = 1;
|
||||
|
||||
/* NOTE: changes over time */
|
||||
currTimeout = CyaSSL_dtls_get_current_timeout(ssl);
|
||||
|
||||
if (error == SSL_ERROR_WANT_READ)
|
||||
printf("Server wants to read...\n");
|
||||
else
|
||||
printf("Server wants to write...\n");
|
||||
|
||||
printf("waiting to select()\n");
|
||||
|
||||
/* select for dtls server */
|
||||
select_ret = dtls_select(sockfd, currTimeout);
|
||||
|
||||
/* initialize new thread ID each time we loop */
|
||||
|
||||
|
||||
if (select_ret == TEST_RECV_READY) {
|
||||
printf("TEST_RECV_READY!\n");
|
||||
while (( ret = CyaSSL_accept(ssl))){
|
||||
if (pthread_create(&threadID, NULL, ThreadControl, (void *)
|
||||
&ret) < 0)
|
||||
printf("pthread_create() failed\n");
|
||||
|
||||
printf("Control handed to ThreadControl()\n");
|
||||
}
|
||||
}
|
||||
|
||||
if (select_ret == TEST_ERROR_READY && !CyaSSL_dtls(ssl)) {
|
||||
printf("TEST_ERROR_READY\n");
|
||||
error = CyaSSL_get_error(ssl, 0);
|
||||
}
|
||||
|
||||
else if (select_ret == TEST_TIMEOUT && CyaSSL_dtls(ssl) &&
|
||||
CyaSSL_dtls_got_timeout(ssl) ) {
|
||||
printf("TEST_TIMEOUT\n");
|
||||
error = SSL_ERROR_WANT_READ;
|
||||
}
|
||||
else if (select_ret == TEST_TIMEOUT && CyaSSL_dtls(ssl) &&
|
||||
CyaSSL_dtls_got_timeout(ssl) >= 0) {
|
||||
error = SSL_ERROR_WANT_READ;
|
||||
}
|
||||
else {
|
||||
error = SSL_FATAL_ERROR;
|
||||
}
|
||||
}
|
||||
if (ret != SSL_SUCCESS){
|
||||
printf("SSL_accept failed\n");
|
||||
continue;
|
||||
}
|
||||
|
||||
|
||||
printf("Connected with a client!\n");
|
||||
|
||||
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)
|
||||
err_sys("SSL_read failed");
|
||||
}
|
||||
|
||||
|
||||
if (CyaSSL_write(ssl, ack, sizeof(ack)) < 0) {
|
||||
err_sys("CyaSSL_write fail");
|
||||
}
|
||||
|
||||
else
|
||||
printf("lost the connection to client\n");
|
||||
|
||||
printf("reply sent \"%s\"\n", ack);
|
||||
|
||||
CyaSSL_set_fd(ssl, 0);
|
||||
CyaSSL_shutdown(ssl);
|
||||
CyaSSL_free(ssl);
|
||||
|
||||
printf("Client left return to idle state\n");
|
||||
continue;
|
||||
}
|
||||
CyaSSL_CTX_free(ctx);
|
||||
return(0);
|
||||
}
|
||||
Loading…
Reference in New Issue