266 lines
6.9 KiB
C
266 lines
6.9 KiB
C
/*
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* client-dtls-resume.c
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*
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* Copyright (C) 2006-2020 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 client for instructional/learning purposes.
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*/
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#include <wolfssl/options.h>
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#include <unistd.h>
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#include <wolfssl/ssl.h>
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#include <netdb.h>
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#include <signal.h>
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define MAXLINE 4096
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#define SERV_PORT 11111
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static int new_udp_client_socket(WOLFSSL * ssl, const char * host);
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static int talk_to_server(WOLFSSL * ssl, const char * msg);
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int
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main(int argc,
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char * argv[])
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{
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/* standard variables used in a dtls client*/
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int sockfd = 0;
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int err1;
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const char * host = argv[1];
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WOLFSSL * ssl = NULL; /* The ssl for original connection. */
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WOLFSSL * ssl_res = NULL; /* The ssl for resuming connection. */
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WOLFSSL_CTX * ctx = NULL;
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WOLFSSL_SESSION * session = NULL;
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char cert_array[] = "../certs/ca-cert.pem";
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char buffer[80];
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char * certs = cert_array;
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int ret = 0;
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/* variables used in a dtls client for session reuse*/
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if (argc != 2) {
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printf("usage: udpcli <IP address>\n");
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return EXIT_FAILURE;
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}
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wolfSSL_Init();
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/* Un-comment the following line to enable debugging */
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/* wolfSSL_Debugging_ON(); */
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if ( (ctx = wolfSSL_CTX_new(wolfDTLSv1_2_client_method())) == NULL) {
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fprintf(stderr, "wolfSSL_CTX_new error.\n");
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return EXIT_FAILURE;
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}
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if (wolfSSL_CTX_load_verify_locations(ctx, certs, 0) != SSL_SUCCESS) {
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fprintf(stderr, "Error loading %s, please check the file.\n", certs);
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return EXIT_FAILURE;
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}
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ssl = wolfSSL_new(ctx);
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if (ssl == NULL) {
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printf("error: wolfSSL_new failed\n");
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return EXIT_FAILURE;
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}
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sockfd = new_udp_client_socket(ssl, host);
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if (sockfd <= 0) {
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printf("error: new_udp_client_socket failed\n");
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return EXIT_FAILURE;
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}
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if (wolfSSL_connect(ssl) != SSL_SUCCESS) {
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err1 = wolfSSL_get_error(ssl, 0);
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memset(buffer, 0, 80);
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printf("err = %d, %s\n", err1, wolfSSL_ERR_error_string(err1, buffer));
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printf("SSL_connect failed");
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return EXIT_FAILURE;
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}
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/* Save the session */
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session = wolfSSL_get1_session(ssl);
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if (session == NULL) {
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printf("error: get session failed\n");
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return EXIT_FAILURE;
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}
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printf("info: saved session: %p\n", session);
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ret = talk_to_server(ssl, "first client message");
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if (ret) {
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return EXIT_FAILURE;
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}
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/* Close the socket */
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wolfSSL_shutdown(ssl);
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wolfSSL_free(ssl);
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close(sockfd);
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ssl = NULL;
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sockfd = 0;
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/* Make a new WOLFSSL. */
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ssl_res = wolfSSL_new(ctx);
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if (ssl_res == NULL) {
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printf("error: wolfSSL_new failed\n");
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return EXIT_FAILURE;
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}
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/* Set up to resume the session */
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ret = wolfSSL_set_session(ssl_res, session);
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if (ret != WOLFSSL_SUCCESS) {
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fprintf(stderr, "error: wolfSSL_set_session returned: %d\n", ret);
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return EXIT_FAILURE;
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}
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/* Open a new udp socket. */
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sockfd = new_udp_client_socket(ssl_res, host);
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if (sockfd <= 0) {
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printf("error: new_udp_client_socket failed\n");
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return EXIT_FAILURE;
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}
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/* Test if the resume was successful */
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if (wolfSSL_session_reused(ssl_res)) {
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printf("info: session ID reused; Successful resume\n");
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}
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else {
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printf("info: session ID not reused\n");
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}
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ret = talk_to_server(ssl_res, "client message after resume");
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if (ret) {
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return EXIT_FAILURE;
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}
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/* Cleanup memory used for storing the session information */
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wolfSSL_shutdown(ssl_res);
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wolfSSL_free(ssl_res);
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wolfSSL_SESSION_free(session);
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close(sockfd);
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wolfSSL_CTX_free(ctx);
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wolfSSL_Cleanup();
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ssl_res = NULL;
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session = NULL;
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sockfd = 0;
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return 0;
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}
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/* Given an ssl structure and host, open a new udp
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* client socket and set it and the server address
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* to the ssl.
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**/
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static int
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new_udp_client_socket(WOLFSSL * ssl,
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const char * host)
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{
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struct sockaddr_in servAddr;
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int sockfd = 0;
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int ret = 0;
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sockfd = socket(AF_INET, SOCK_DGRAM, 0);
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if (sockfd <= 0) {
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int errsave = errno;
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printf("error: socket returned %d\n", errsave);
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return -1;
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}
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/* servAddr setup */
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memset(&servAddr, 0, sizeof(servAddr));
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servAddr.sin_family = AF_INET;
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servAddr.sin_port = htons(SERV_PORT);
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ret = inet_pton(AF_INET, host, &servAddr.sin_addr);
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if (ret != 1) {
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printf("error: inet_pton %s returned %d\n", host, ret);
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close(sockfd);
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sockfd = 0;
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return -1;
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}
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ret = wolfSSL_dtls_set_peer(ssl, &servAddr, sizeof(servAddr));
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if (ret != SSL_SUCCESS) {
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printf("error: wolfSSL_dtls_set_peer returned %d\n", ret);
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close(sockfd);
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sockfd = 0;
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return -1;
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}
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wolfSSL_set_fd(ssl, sockfd);
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printf("info: opened socket: %d\n", sockfd);
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return sockfd;
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}
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/* Send a message to the server.
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**/
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static int
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talk_to_server(WOLFSSL * ssl,
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const char * send_msg)
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{
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char recv_msg[MAXLINE];
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int recv_len;
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memset(recv_msg, 0, sizeof(recv_msg));
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/* Attempt to send send_msg to the server */
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if ( ( wolfSSL_write(ssl, send_msg, strlen(send_msg))) !=
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strlen(send_msg) ) {
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printf("Error: wolfSSL_write failed.\n");
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return -1;
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}
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/* Attempt to read a message from server and store it in recv_msg */
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recv_len = wolfSSL_read(ssl, recv_msg, sizeof(recv_msg) - 1);
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/* Error checking wolfSSL_read */
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if (recv_len < 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("Error: wolfSSL_read failed.\n");
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}
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return -1;
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}
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recv_msg[recv_len] = '\0';
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printf("info: server response: %s", recv_msg);
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return 0;
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}
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