236 lines
7.5 KiB
C
236 lines
7.5 KiB
C
/* server-dtls13.c
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*
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* Copyright (C) 2006-2022 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 1.3 server for instructional/learning purposes.
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* This example can only accept one connection at a time.
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*
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* Define USE_DTLS12 to use DTLS 1.2 instead of DTLS 1.3
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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_in */
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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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#include "dtls-common.h"
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WOLFSSL_CTX* ctx = NULL;
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WOLFSSL* ssl = NULL;
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int listenfd = INVALID_SOCKET; /* Initialize our socket */
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static void sig_handler(const int sig);
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static void free_resources(void);
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int main(int argc, char** argv)
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{
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/* Loc short for "location" */
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int exitVal = 1;
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struct sockaddr_in servAddr; /* our server's address */
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struct sockaddr_in cliaddr; /* the client's address */
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int ret;
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int err;
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int recvLen = 0; /* length of message */
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socklen_t cliLen;
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char buff[MAXLINE]; /* the incoming message */
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char ack[] = "I hear you fashizzle!\n";
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/* Initialize wolfSSL before assigning ctx */
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if (wolfSSL_Init() != WOLFSSL_SUCCESS) {
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fprintf(stderr, "wolfSSL_Init error.\n");
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return exitVal;
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}
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/* No-op when debugging is not compiled in */
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wolfSSL_Debugging_ON();
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/* Set ctx to DTLS 1.3 */
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if ((ctx = wolfSSL_CTX_new(
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#ifndef USE_DTLS12
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wolfDTLSv1_3_server_method()
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#else
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wolfDTLSv1_2_server_method()
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#endif
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)) == NULL) {
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fprintf(stderr, "wolfSSL_CTX_new error.\n");
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goto cleanup;
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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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fprintf(stderr, "Error loading %s, please check the file.\n", caCertLoc);
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goto cleanup;
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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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fprintf(stderr, "Error loading %s, please check the file.\n", servCertLoc);
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goto cleanup;
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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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fprintf(stderr, "Error loading %s, please check the file.\n", servKeyLoc);
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goto cleanup;
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}
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/* Create a UDP/IP socket */
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if ((listenfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0 ) {
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perror("socket()");
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goto cleanup;
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}
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printf("Socket allocated\n");
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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.sin_family = AF_INET;
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servAddr.sin_addr.s_addr = htonl(INADDR_ANY);
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servAddr.sin_port = htons(SERV_PORT);
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/* Bind Socket */
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if (bind(listenfd, (struct sockaddr*)&servAddr, sizeof(servAddr)) < 0) {
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perror("bind()");
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goto cleanup;
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}
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signal(SIGINT, sig_handler);
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while (1) {
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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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ret = (int)recvfrom(listenfd, (char *)&buff, sizeof(buff), MSG_PEEK,
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(struct sockaddr*)&cliaddr, &cliLen);
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if (ret < 0) {
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perror("recvfrom()");
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goto cleanup;
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}
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else if (ret == 0) {
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fprintf(stderr, "recvfrom zero return\n");
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goto cleanup;
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}
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/* Create the WOLFSSL Object */
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if ((ssl = wolfSSL_new(ctx)) == NULL) {
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fprintf(stderr, "wolfSSL_new error.\n");
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goto cleanup;
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}
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if (wolfSSL_dtls_set_peer(ssl, &cliaddr, cliLen) != WOLFSSL_SUCCESS) {
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fprintf(stderr, "wolfSSL_dtls_set_peer error.\n");
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goto cleanup;
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}
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if (wolfSSL_set_fd(ssl, listenfd) != WOLFSSL_SUCCESS) {
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fprintf(stderr, "wolfSSL_set_fd error.\n");
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break;
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}
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if (wolfSSL_accept(ssl) != SSL_SUCCESS) {
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err = wolfSSL_get_error(ssl, 0);
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fprintf(stderr, "error = %d, %s\n", err, wolfSSL_ERR_reason_error_string(err));
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fprintf(stderr, "SSL_accept failed.\n");
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goto cleanup;
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}
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showConnInfo(ssl);
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while (1) {
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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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err = wolfSSL_get_error(ssl, 0);
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if (err == WOLFSSL_ERROR_ZERO_RETURN) /* Received shutdown */
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break;
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fprintf(stderr, "error = %d, %s\n", err, wolfSSL_ERR_reason_error_string(err));
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fprintf(stderr, "SSL_read failed.\n");
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goto cleanup;
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}
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printf("Sending reply.\n");
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if (wolfSSL_write(ssl, ack, sizeof(ack)) < 0) {
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err = wolfSSL_get_error(ssl, 0);
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fprintf(stderr, "error = %d, %s\n", err, wolfSSL_ERR_reason_error_string(err));
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fprintf(stderr, "wolfSSL_write failed.\n");
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goto cleanup;
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}
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}
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printf("reply sent \"%s\"\n", ack);
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/* Attempt a full shutdown */
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ret = wolfSSL_shutdown(ssl);
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if (ret == WOLFSSL_SHUTDOWN_NOT_DONE)
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ret = wolfSSL_shutdown(ssl);
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if (ret != WOLFSSL_SUCCESS) {
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err = wolfSSL_get_error(ssl, 0);
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fprintf(stderr, "err = %d, %s\n", err, wolfSSL_ERR_reason_error_string(err));
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fprintf(stderr, "wolfSSL_shutdown failed\n");
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}
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wolfSSL_free(ssl);
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ssl = NULL;
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printf("Awaiting new connection\n");
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}
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exitVal = 0;
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cleanup:
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free_resources();
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wolfSSL_Cleanup();
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return exitVal;
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}
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static void sig_handler(const int sig)
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{
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(void)sig;
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free_resources();
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wolfSSL_Cleanup();
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}
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static void free_resources(void)
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{
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if (ssl != NULL) {
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wolfSSL_shutdown(ssl);
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wolfSSL_free(ssl);
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ssl = NULL;
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}
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if (ctx != NULL) {
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wolfSSL_CTX_free(ctx);
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ctx = NULL;
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}
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if (listenfd != INVALID_SOCKET) {
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close(listenfd);
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listenfd = INVALID_SOCKET;
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}
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}
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