A local copy of OpenSSL from GitHub
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/*
* Copyright 1998-2017 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
/*-
* A minimal program to serve an SSL connection.
* It uses blocking.
* saccept host:port
* host is the interface IP to use. If any interface, use *:port
* The default it *:4433
*
* cc -I../../include saccept.c -L../.. -lssl -lcrypto -ldl
*/
#include <stdio.h>
#include <signal.h>
#include <stdlib.h>
#include <openssl/err.h>
#include <openssl/ssl.h>
#define CERT_FILE "server.pem"
static volatile int done = 0;
void interrupt(int sig)
{
done = 1;
}
void sigsetup(void)
{
struct sigaction sa;
/*
* Catch at most once, and don't restart the accept system call.
*/
sa.sa_flags = SA_RESETHAND;
sa.sa_handler = interrupt;
sigemptyset(&sa.sa_mask);
sigaction(SIGINT, &sa, NULL);
}
int main(int argc, char *argv[])
{
char *port = NULL;
BIO *in = NULL;
BIO *ssl_bio, *tmp;
SSL_CTX *ctx;
char buf[512];
int ret = EXIT_FAILURE, i;
if (argc <= 1)
port = "*:4433";
else
port = argv[1];
ctx = SSL_CTX_new(TLS_server_method());
if (!SSL_CTX_use_certificate_chain_file(ctx, CERT_FILE))
goto err;
if (!SSL_CTX_use_PrivateKey_file(ctx, CERT_FILE, SSL_FILETYPE_PEM))
goto err;
if (!SSL_CTX_check_private_key(ctx))
goto err;
/* Setup server side SSL bio */
ssl_bio = BIO_new_ssl(ctx, 0);
if ((in = BIO_new_accept(port)) == NULL)
goto err;
/*
* This means that when a new connection is accepted on 'in', The ssl_bio
* will be 'duplicated' and have the new socket BIO push into it.
* Basically it means the SSL BIO will be automatically setup
*/
BIO_set_accept_bios(in, ssl_bio);
/* Arrange to leave server loop on interrupt */
sigsetup();
again:
/*
* The first call will setup the accept socket, and the second will get a
* socket. In this loop, the first actual accept will occur in the
* BIO_read() function.
*/
if (BIO_do_accept(in) <= 0)
goto err;
while (!done) {
i = BIO_read(in, buf, 512);
if (i == 0) {
/*
* If we have finished, remove the underlying BIO stack so the
* next time we call any function for this BIO, it will attempt
* to do an accept
*/
printf("Done\n");
tmp = BIO_pop(in);
BIO_free_all(tmp);
goto again;
}
if (i < 0)
goto err;
fwrite(buf, 1, i, stdout);
fflush(stdout);
}
ret = EXIT_SUCCESS;
err:
if (ret != EXIT_SUCCESS)
ERR_print_errors_fp(stderr);
BIO_free(in);
return ret;
}