279 lines
8.1 KiB
C
279 lines
8.1 KiB
C
/*
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* client-dtls-threaded.c
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*
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* Copyright (C) 2006-2024 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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* A simple dtls client with configurable threadpool, for
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* instructional/learning purposes. Utilizes DTLS 1.2.
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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 MSGLEN 4096
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#define SERV_PORT 11111
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#define DTLS_NUMTHREADS 16
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typedef struct {
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WOLFSSL * ssl;
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int activefd;
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WOLFSSL_CTX * ctx;
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} thread_args_t;
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static void safer_shutdown(thread_args_t * args);
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static void * client_work(void * arg);
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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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WOLFSSL_CTX * ctx = NULL; /* ctx shared by threads */
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const char * certs = "../certs/ca-cert.pem";
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int ret = 0;
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int n_threads = 2;
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pthread_t threads[DTLS_NUMTHREADS];
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thread_args_t args[DTLS_NUMTHREADS];
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int opt = 0;
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memset(threads, 0, sizeof(threads));
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memset(args, 0, sizeof(args));
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while ((opt = getopt(argc, argv, "t:?")) != -1) {
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switch (opt) {
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case 't':
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n_threads = atoi(optarg);
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break;
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case '?':
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printf("usage:\n");
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printf(" ./client-dtls-threaded [-t n]\n");
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printf("\n");
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printf("description:\n");
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printf(" A simple dtls client with configurable threadpool.\n");
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printf(" Num allowed threads is: 1 <= n <= %d\n",
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DTLS_NUMTHREADS);
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default:
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return EXIT_FAILURE;
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}
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}
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if (n_threads <= 0 || n_threads > DTLS_NUMTHREADS) {
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printf("error: invalid n_threads: %d\n", n_threads);
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return EXIT_FAILURE;
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}
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/* Initialize wolfSSL before assigning ctx */
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wolfSSL_Init();
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ctx = wolfSSL_CTX_new(wolfDTLSv1_2_client_method());
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if (ctx == NULL) {
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printf("error: wolfSSL_CTX_new failed\n");
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return EXIT_FAILURE;
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}
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/* Load certificates into ctx variable */
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ret = wolfSSL_CTX_load_verify_locations(ctx, certs, 0);
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if (ret != SSL_SUCCESS) {
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printf("error: loading %s failed, please check the file\n", certs);
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return EXIT_FAILURE;
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}
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for (size_t i = 0; i < n_threads; ++i) {
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args[i].ctx = ctx;
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ret = pthread_create(&threads[i], NULL, client_work, &args[i]);
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if (ret == 0 ) {
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printf("info: spawned thread: %ld\n", (long)threads[i]);
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}
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else {
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printf("error: pthread_create returned %d\n", ret);
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threads[i] = 0;
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}
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}
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for (size_t i = 0; i < n_threads; ++i) {
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if (threads[i]) {
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pthread_join(threads[i], NULL);
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printf("info: joined thread: %ld\n", (long)threads[i]);
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threads[i] = 0;
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}
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}
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wolfSSL_CTX_free(ctx);
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wolfSSL_Cleanup();
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return EXIT_SUCCESS;
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}
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static void *
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client_work(void * args)
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{
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thread_args_t * thread_args = (thread_args_t *) args;
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int n_bytes = 0;
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int err1;
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struct sockaddr_in servAddr;
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char send_msg[MSGLEN];
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char recv_msg[MSGLEN];
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int ret = 0;
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const char * localhost_ip = "127.0.0.1";
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/* Assign ssl variable */
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thread_args->ssl = wolfSSL_new(thread_args->ctx);
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if (thread_args->ssl == NULL) {
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printf("error: wolfSSL_new failed\n");
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return NULL;
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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, localhost_ip, &servAddr.sin_addr);
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if (ret != 1) {
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printf("error: inet_pton %s returned %d\n", localhost_ip, ret);
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return NULL;
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}
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ret = wolfSSL_dtls_set_peer(thread_args->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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return NULL;
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}
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thread_args->activefd = socket(AF_INET, SOCK_DGRAM, 0);
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if (thread_args->activefd <= 0) {
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printf("error: socket returned %d\n", thread_args->activefd);
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return NULL;
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}
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printf("info: opened socket: %d\n", thread_args->activefd);
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/* Set the file descriptor for ssl and connect with ssl variable */
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wolfSSL_set_fd(thread_args->ssl, thread_args->activefd);
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if (wolfSSL_connect(thread_args->ssl) != SSL_SUCCESS) {
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err1 = wolfSSL_get_error(thread_args->ssl, 0);
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printf("error: thread %ld: wolfSSL_connect returned = %d, %s\n",
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(long)pthread_self(), err1,
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wolfSSL_ERR_reason_error_string(err1));
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return NULL;
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}
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/* Simulate a simple protocol over DTLS that exchanges a
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* sequence of records, and checks we get correct records
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* from correct server threads. */
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long int server_tid = 0;
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const char * tid_str = NULL; /* Str to thread id in response. */
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for (size_t i = 0; i < 4; ++i) {
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memset(send_msg, '\0', sizeof(send_msg));
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memset(recv_msg, '\0', sizeof(recv_msg));
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char seq = '0' + (int) i;
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sprintf(send_msg, "msg %zu from client thread %ld\n", i,
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(long)pthread_self());
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n_bytes = wolfSSL_write(thread_args->ssl, send_msg, strlen(send_msg));
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if (n_bytes != strlen(send_msg)) {
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printf("error: wolfSSL_write returned %d", n_bytes);
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break;
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}
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/* n is the # of bytes received */
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n_bytes = wolfSSL_read(thread_args->ssl, recv_msg, sizeof(recv_msg)-1);
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if (n_bytes < 0) {
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printf("error: wolfSSL_read returned %d", n_bytes);
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break;
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}
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recv_msg[n_bytes] = '\0';
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fputs(recv_msg, stdout);
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/* Check the server replied with the correct sequence record, e.g.:
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* "msg 2 from server thread 140146322425536" */
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if (recv_msg[4] != seq) {
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printf("error: got msg %c, expected %c\n", recv_msg[4], seq);
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break;
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}
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tid_str = &recv_msg[25];
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if (server_tid == 0) {
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/* Save the server thread id on message 0. */
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server_tid = atol(tid_str);
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}
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else {
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/* Compare saved thread id. */
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if (server_tid != atol(tid_str)) {
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printf("error: got rsp from server thread %ld, expected %ld\n",
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server_tid, atol(tid_str));
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break;
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}
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else {
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printf("info: got response from server thread %ld\n",
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server_tid);
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}
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}
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sleep(1);
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}
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safer_shutdown(thread_args);
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return NULL;
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}
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/* Small shutdown wrapper to safely clean up a thread's
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* connection. */
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static void
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safer_shutdown(thread_args_t * args)
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{
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if (args == NULL) {
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printf("error: safer_shutdown with null args\n");
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return;
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}
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if (args->ssl != NULL) {
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printf("info: closed tls session: %p\n", (void*) args->ssl);
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wolfSSL_shutdown(args->ssl);
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wolfSSL_free(args->ssl);
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args->ssl = NULL;
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}
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if (args->activefd > 0) {
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printf("info: closed socket: %d\n", args->activefd);
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close(args->activefd);
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args->activefd = 0;
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}
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return;
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}
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