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/*
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* Copyright (C) 2017-2020 Red Hat, Inc.
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*
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* Author: Nikos Mavrogiannopoulos
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*
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* This file is part of GnuTLS.
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*
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* GnuTLS is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GnuTLS is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>
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*/
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/* This program tests whether the second DTLS client hello contains the same
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* random value, and whether it is initialized.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#if defined(_WIN32)
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/* socketpair isn't supported on Win32. */
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int main(int argc, char **argv)
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{
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exit(77);
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}
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#else
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#include <string.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#if !defined(_WIN32)
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#include <sys/wait.h>
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#include <signal.h>
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#endif
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#include <unistd.h>
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#include <gnutls/gnutls.h>
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#include <assert.h>
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#include "utils.h"
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#include "cert-common.h"
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const char *side = "";
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static void tls_log_func(int level, const char *str)
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{
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fprintf(stderr, "%s|<%d>| %s", side, level, str);
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}
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static unsigned cb_called = 0;
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static int hello_callback(gnutls_session_t session, unsigned int htype,
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unsigned post, unsigned int incoming, const gnutls_datum_t *msg)
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{
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unsigned non_zero = 0, i;
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if (htype == GNUTLS_HANDSHAKE_CLIENT_HELLO && post == GNUTLS_HOOK_POST) {
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if (cb_called == 0) {
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unsigned char crandom[32];
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gnutls_datum_t tmp;
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gnutls_session_get_random(session, &tmp, NULL);
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assert(tmp.size == 32);
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memcpy(crandom, tmp.data, tmp.size);
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cb_called++;
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/* check if uninitialized */
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for (i=0;i<32;i++) {
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if (crandom[i] != 0) {
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non_zero++;
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}
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}
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if (non_zero <= 8) {
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fail("the client random value seems uninitialized\n");
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}
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} else {
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cb_called++;
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}
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} else if (htype == GNUTLS_HANDSHAKE_SERVER_HELLO && post == GNUTLS_HOOK_POST) {
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unsigned char crandom[32];
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gnutls_datum_t tmp;
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gnutls_session_get_random(session, NULL, &tmp);
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assert(tmp.size == 32);
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memcpy(crandom, tmp.data, tmp.size);
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/* check if uninitialized */
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for (i=0;i<32;i++) {
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if (crandom[i] != 0) {
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non_zero++;
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}
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}
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if (non_zero <= 8) {
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fail("the server random value seems uninitialized\n");
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}
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}
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return 0;
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}
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static void client(int sd, const char *priority)
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{
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int ret;
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gnutls_session_t session;
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gnutls_certificate_credentials_t clientx509cred;
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gnutls_global_set_log_function(tls_log_func);
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if (debug)
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gnutls_global_set_log_level(4711);
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side = "client";
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gnutls_certificate_allocate_credentials(&clientx509cred);
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assert(gnutls_init(&session, GNUTLS_CLIENT)>=0);
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if (!priority) {
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assert(gnutls_set_default_priority(session) >= 0);
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} else {
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assert(gnutls_priority_set_direct(session, priority, NULL) >= 0);
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}
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gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE,
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clientx509cred);
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gnutls_transport_set_int(session, sd);
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gnutls_handshake_set_timeout(session, 20 * 1000);
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gnutls_handshake_set_hook_function(session, GNUTLS_HANDSHAKE_ANY,
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GNUTLS_HOOK_BOTH, hello_callback);
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ret = gnutls_handshake(session);
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if (ret < 0) {
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fail("client: Handshake failed: %s\n", gnutls_strerror(ret));
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} else {
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if (debug)
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success("client: Handshake was completed\n");
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}
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if (cb_called != 1) {
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fail("client: the callback was not seen (%d)!\n", cb_called);
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}
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gnutls_bye(session, GNUTLS_SHUT_WR);
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close(sd);
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gnutls_deinit(session);
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gnutls_certificate_free_credentials(clientx509cred);
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}
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static void server(int sd, const char *priority)
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{
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int ret;
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gnutls_certificate_credentials_t serverx509cred;
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gnutls_session_t session;
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gnutls_global_set_log_function(tls_log_func);
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if (debug)
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gnutls_global_set_log_level(4711);
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side = "server";
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assert(gnutls_certificate_allocate_credentials(&serverx509cred)>=0);
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assert(gnutls_certificate_set_x509_key_mem(serverx509cred,
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&server_cert, &server_key,
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GNUTLS_X509_FMT_PEM)>=0);
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assert(gnutls_init(&session, GNUTLS_SERVER)>=0);
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assert(session != NULL);
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if (!priority) {
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assert(gnutls_set_default_priority(session) >= 0);
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} else {
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assert(gnutls_priority_set_direct(session, priority, NULL) >= 0);
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}
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gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE,
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serverx509cred);
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gnutls_transport_set_int(session, sd);
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gnutls_handshake_set_timeout(session, 20 * 1000);
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ret = gnutls_handshake(session);
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if (ret < 0) {
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fail("server: Handshake has failed: %s\n\n",
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gnutls_strerror(ret));
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}
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if (debug)
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success("server: Handshake was completed\n");
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/* do not wait for the peer to close the connection.
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*/
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gnutls_bye(session, GNUTLS_SHUT_WR);
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close(sd);
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gnutls_deinit(session);
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gnutls_certificate_free_credentials(serverx509cred);
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if (debug)
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success("server: finished\n");
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}
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static void start(const char *name, const char *priority)
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{
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pid_t child;
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int sockets[2];
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int err;
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success("testing: %s\n", name);
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cb_called = 0;
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err = socketpair(AF_UNIX, SOCK_STREAM, 0, sockets);
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if (err == -1) {
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perror("socketpair");
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fail("socketpair failed\n");
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return;
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}
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child = fork();
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if (child < 0) {
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perror("fork");
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fail("fork");
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return;
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}
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if (child) {
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int status = 0;
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/* parent */
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close(sockets[1]);
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client(sockets[0], priority);
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wait(&status);
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check_wait_status(status);
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} else {
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close(sockets[0]);
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server(sockets[1], priority);
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exit(0);
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}
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}
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void doit(void)
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{
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signal(SIGPIPE, SIG_IGN);
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start("default", NULL);
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start("tls1.3", "NORMAL:-VERS-ALL:+VERS-TLS1.3");
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start("tls1.2", "NORMAL:-VERS-ALL:+VERS-TLS1.2");
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start("tls1.1", "NORMAL:-VERS-ALL:+VERS-TLS1.1");
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start("tls1.0", "NORMAL:-VERS-ALL:+VERS-TLS1.0");
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}
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#endif /* _WIN32 */
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