237 lines
7.5 KiB
C
237 lines
7.5 KiB
C
/* server-dtls-ipv6.c
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*
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* Copyright (C) 2006-2015 wolfSSL Inc.
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*
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* This file is part of wolfSSL. (formerly known as CyaSSL)
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*
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* wolfSSL is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* wolfSSL is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*
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*=============================================================================
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*
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* Bare-bones example of a DTLS server for instructional/learning purposes.
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* Utilizes DTLS 1.2.
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*/
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#include <wolfssl/options.h>
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#include <stdio.h> /* standard in/out procedures */
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#include <stdlib.h> /* defines system calls */
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#include <string.h> /* necessary for memset */
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#include <netdb.h>
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#include <sys/socket.h> /* used for all socket calls */
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#include <netinet/in.h> /* used for sockaddr_in6 */
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#include <arpa/inet.h>
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#include <wolfssl/ssl.h>
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#include <errno.h>
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#include <signal.h>
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#include <unistd.h>
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#define SERV_PORT 11111 /* define our server port number */
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#define MSGLEN 4096
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static int cleanup; /* To handle shutdown */
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struct sockaddr_in6 servAddr; /* our server's address */
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struct sockaddr_in6 cliaddr; /* the client's address */
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void sig_handler(const int sig);
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void sig_handler(const int sig)
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{
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printf("\nSIGINT %d handled\n", sig);
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cleanup = 1;
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return;
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}
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int main(int argc, char** argv)
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{
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/* cont short for "continue?", Loc short for "location" */
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int cont = 0;
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char caCertLoc[] = "../certs/ca-cert.pem";
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char servCertLoc[] = "../certs/server-cert.pem";
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char servKeyLoc[] = "../certs/server-key.pem";
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WOLFSSL_CTX* ctx;
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/* Variables for awaiting datagram */
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int on = 1;
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int res = 1;
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int bytesReceived = 0;
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int recvLen = 0; /* length of message */
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int listenfd = 0; /* Initialize our socket */
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WOLFSSL* ssl = NULL;
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socklen_t cliLen;
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socklen_t len = sizeof(int);
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unsigned char b[MSGLEN]; /* watch for incoming messages */
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char buff[MSGLEN]; /* the incoming message */
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char ack[] = "I hear you fashizzle!\n";
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/* Code for handling signals */
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struct sigaction act, oact;
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act.sa_handler = sig_handler;
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sigemptyset(&act.sa_mask);
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act.sa_flags = 0;
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sigaction(SIGINT, &act, &oact);
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/* "./config --enable-debug" and uncomment next line for debugging */
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/* wolfSSL_Debugging_ON(); */
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/* Initialize wolfSSL */
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wolfSSL_Init();
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/* Set ctx to DTLS 1.2 */
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if ((ctx = wolfSSL_CTX_new(wolfDTLSv1_2_server_method())) == NULL) {
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printf("wolfSSL_CTX_new error.\n");
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return 1;
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}
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/* Load CA certificates */
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if (wolfSSL_CTX_load_verify_locations(ctx,caCertLoc,0) !=
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SSL_SUCCESS) {
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printf("Error loading %s, please check the file.\n", caCertLoc);
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return 1;
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}
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/* Load server certificates */
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if (wolfSSL_CTX_use_certificate_file(ctx, servCertLoc, SSL_FILETYPE_PEM) !=
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SSL_SUCCESS) {
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printf("Error loading %s, please check the file.\n", servCertLoc);
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return 1;
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}
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/* Load server Keys */
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if (wolfSSL_CTX_use_PrivateKey_file(ctx, servKeyLoc,
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SSL_FILETYPE_PEM) != SSL_SUCCESS) {
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printf("Error loading %s, please check the file.\n", servKeyLoc);
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return 1;
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}
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/* Await Datagram */
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while (cleanup != 1) {
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/* Create a UDP/IP socket */
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if ((listenfd = socket(AF_INET6, SOCK_DGRAM, 0)) < 0 ) {
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printf("Cannot create socket.\n");
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cleanup = 1;
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}
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printf("Socket allocated\n");
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/* clear servAddr each loop */
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memset((char *)&servAddr, 0, sizeof(servAddr));
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/* host-to-network-long conversion (htonl) */
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/* host-to-network-short conversion (htons) */
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servAddr.sin6_family = AF_INET6;
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servAddr.sin6_port = htons(SERV_PORT);
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/* Eliminate socket already in use error */
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res = setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &on, len);
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if (res < 0) {
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printf("Setsockopt SO_REUSEADDR failed.\n");
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cleanup = 1;
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cont = 1;
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}
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/*Bind Socket*/
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if (bind(listenfd, (struct sockaddr*)&servAddr, sizeof(servAddr)) < 0) {
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printf("Bind failed.\n");
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cleanup = 1;
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cont = 1;
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}
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printf("Awaiting client connection on port %d\n", SERV_PORT);
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cliLen = sizeof(cliaddr);
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bytesReceived = (int)recvfrom(listenfd, (char *)&b, sizeof(b), MSG_PEEK,
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(struct sockaddr*)&cliaddr, &cliLen);
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if (bytesReceived < 0) {
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printf("No clients in que, enter idle state\n");
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continue;
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}
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else if (bytesReceived > 0) {
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if (connect(listenfd, (const struct sockaddr *)&cliaddr,
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sizeof(cliaddr)) != 0) {
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printf("Udp connect failed.\n");
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cleanup = 1;
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cont = 1;
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}
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}
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else {
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printf("Recvfrom failed.\n");
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cleanup = 1;
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cont = 1;
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}
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printf("Connected!\n");
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/* Create the WOLFSSL Object */
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if ((ssl = wolfSSL_new(ctx)) == NULL) {
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printf("wolfSSL_new error.\n");
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cleanup = 1;
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cont = 1;
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}
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/* set the session ssl to client connection port */
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wolfSSL_set_fd(ssl, listenfd);
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if (wolfSSL_accept(ssl) != SSL_SUCCESS) {
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int e = wolfSSL_get_error(ssl, 0);
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printf("error = %d, %s\n", e, wolfSSL_ERR_reason_error_string(e));
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printf("SSL_accept failed.\n");
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continue;
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}
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if ((recvLen = wolfSSL_read(ssl, buff, sizeof(buff)-1)) > 0) {
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printf("heard %d bytes\n", recvLen);
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buff[recvLen] = 0;
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printf("I heard this: \"%s\"\n", buff);
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}
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else if (recvLen < 0) {
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int readErr = wolfSSL_get_error(ssl, 0);
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if(readErr != SSL_ERROR_WANT_READ) {
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printf("SSL_read failed.\n");
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cleanup = 1;
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cont = 1;
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}
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}
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if (wolfSSL_write(ssl, ack, sizeof(ack)) < 0) {
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printf("wolfSSL_write fail.\n");
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cleanup = 1;
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cont = 1;
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}
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else {
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printf("Sending reply.\n");
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}
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printf("reply sent \"%s\"\n", ack);
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wolfSSL_set_fd(ssl, 0);
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wolfSSL_shutdown(ssl);
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wolfSSL_free(ssl);
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printf("Client left cont to idle state\n");
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cont = 0;
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}
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/* With the "continue" keywords, it is possible for the loop to exit *
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* without changing the value of cont */
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if (cleanup == 1) {
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cont = 1;
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}
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if (cont == 1) {
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wolfSSL_CTX_free(ctx);
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wolfSSL_Cleanup();
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}
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return 0;
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}
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