RAND_seed

[thirdparty/openssl.git] / ssl / ssltest.c

/* ssl/ssltest.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "openssl/e_os.h"

#include <openssl/bio.h>
#include <openssl/crypto.h>
#include <openssl/x509.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/rand.h>
#ifdef WINDOWS
#include "../crypto/bio/bss_file.c"
#endif

#if defined(NO_RSA) && !defined(NO_SSL2)
#define NO_SSL2
#endif

#ifdef VMS
#  define TEST_SERVER_CERT "SYS$DISK:[-.APPS]SERVER.PEM"
#  define TEST_CLIENT_CERT "SYS$DISK:[-.APPS]CLIENT.PEM"
#else
#  define TEST_SERVER_CERT "../apps/server.pem"
#  define TEST_CLIENT_CERT "../apps/client.pem"
#endif

static int MS_CALLBACK verify_callback(int ok, X509_STORE_CTX *ctx);
#ifndef NO_RSA
static RSA MS_CALLBACK *tmp_rsa_cb(SSL *s, int is_export,int keylength);
#endif
#ifndef NO_DH
static DH *get_dh512(void);
#endif
static BIO *bio_err=NULL;
static BIO *bio_stdout=NULL;

static char *cipher=NULL;
static int verbose=0;
static int debug=0;
#if 0
/* Not used yet. */
#ifdef FIONBIO
static int s_nbio=0;
#endif
#endif

static const char rnd_seed[] = "string to make the random number generator think it has entropy";

int doit_biopair(SSL *s_ssl,SSL *c_ssl,long bytes);
int doit(SSL *s_ssl,SSL *c_ssl,long bytes);
static void sv_usage(void)
        {
        fprintf(stderr,"usage: ssltest [args ...]\n");
        fprintf(stderr,"\n");
        fprintf(stderr," -server_auth  - check server certificate\n");
        fprintf(stderr," -client_auth  - do client authentication\n");
        fprintf(stderr," -v            - more output\n");
        fprintf(stderr," -d            - debug output\n");
        fprintf(stderr," -reuse        - use session-id reuse\n");
        fprintf(stderr," -num <val>    - number of connections to perform\n");
        fprintf(stderr," -bytes <val>  - number of bytes to swap between client/server\n");
#if !defined NO_DH && !defined NO_DSA
        fprintf(stderr," -dhe1024      - generate 1024 bit key for DHE\n");
#endif
#if !defined NO_DH
        fprintf(stderr," -no_dhe       - disable DHE\n");
#endif
#ifndef NO_SSL2
        fprintf(stderr," -ssl2         - use SSLv2\n");
#endif
#ifndef NO_SSL3
        fprintf(stderr," -ssl3         - use SSLv3\n");
#endif
#ifndef NO_TLS1
        fprintf(stderr," -tls1         - use TLSv1\n");
#endif
        fprintf(stderr," -CApath arg   - PEM format directory of CA's\n");
        fprintf(stderr," -CAfile arg   - PEM format file of CA's\n");
        fprintf(stderr," -cert arg     - Certificate file\n");
        fprintf(stderr," -s_cert arg   - Just the server certificate file\n");
        fprintf(stderr," -c_cert arg   - Just the client certificate file\n");
        fprintf(stderr," -cipher arg   - The cipher list\n");
        fprintf(stderr," -bio_pair     - Use BIO pairs\n");
        fprintf(stderr," -f            - Test even cases that can't work\n");
        }

int main(int argc, char *argv[])
        {
        char *CApath=NULL,*CAfile=NULL;
        int badop=0;
        int bio_pair=0;
        int force=0;
        int tls1=0,ssl2=0,ssl3=0,ret=1;
        int client_auth=0;
        int server_auth=0,i;
        char *server_cert=TEST_SERVER_CERT;
        char *client_cert=TEST_CLIENT_CERT;
        SSL_CTX *s_ctx=NULL;
        SSL_CTX *c_ctx=NULL;
        SSL_METHOD *meth=NULL;
        SSL *c_ssl,*s_ssl;
        int number=1,reuse=0;
        long bytes=1L;
        SSL_CIPHER *ciph;
        int dhe1024 = 0, no_dhe = 0;
#ifndef NO_DH
        DH *dh;
#endif
        verbose = 0;
        debug = 0;
        cipher = 0;
        
        CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON);

        RAND_seed(rnd_seed, sizeof rnd_seed);

        bio_err=BIO_new_fp(stderr,BIO_NOCLOSE);
        bio_stdout=BIO_new_fp(stdout,BIO_NOCLOSE);

        argc--;
        argv++;

        while (argc >= 1)
                {
                if      (strcmp(*argv,"-server_auth") == 0)
                        server_auth=1;
                else if (strcmp(*argv,"-client_auth") == 0)
                        client_auth=1;
                else if (strcmp(*argv,"-v") == 0)
                        verbose=1;
                else if (strcmp(*argv,"-d") == 0)
                        debug=1;
                else if (strcmp(*argv,"-reuse") == 0)
                        reuse=1;
                else if (strcmp(*argv,"-dhe1024") == 0)
                        dhe1024=1;
                else if (strcmp(*argv,"-no_dhe") == 0)
                        no_dhe=1;
                else if (strcmp(*argv,"-ssl2") == 0)
                        ssl2=1;
                else if (strcmp(*argv,"-tls1") == 0)
                        tls1=1;
                else if (strcmp(*argv,"-ssl3") == 0)
                        ssl3=1;
                else if (strncmp(*argv,"-num",4) == 0)
                        {
                        if (--argc < 1) goto bad;
                        number= atoi(*(++argv));
                        if (number == 0) number=1;
                        }
                else if (strcmp(*argv,"-bytes") == 0)
                        {
                        if (--argc < 1) goto bad;
                        bytes= atol(*(++argv));
                        if (bytes == 0L) bytes=1L;
                        i=strlen(argv[0]);
                        if (argv[0][i-1] == 'k') bytes*=1024L;
                        if (argv[0][i-1] == 'm') bytes*=1024L*1024L;
                        }
                else if (strcmp(*argv,"-cert") == 0)
                        {
                        if (--argc < 1) goto bad;
                        server_cert= *(++argv);
                        }
                else if (strcmp(*argv,"-s_cert") == 0)
                        {
                        if (--argc < 1) goto bad;
                        server_cert= *(++argv);
                        }
                else if (strcmp(*argv,"-c_cert") == 0)
                        {
                        if (--argc < 1) goto bad;
                        client_cert= *(++argv);
                        }
                else if (strcmp(*argv,"-cipher") == 0)
                        {
                        if (--argc < 1) goto bad;
                        cipher= *(++argv);
                        }
                else if (strcmp(*argv,"-CApath") == 0)
                        {
                        if (--argc < 1) goto bad;
                        CApath= *(++argv);
                        }
                else if (strcmp(*argv,"-CAfile") == 0)
                        {
                        if (--argc < 1) goto bad;
                        CAfile= *(++argv);
                        }
                else if (strcmp(*argv,"-bio_pair") == 0)
                        {
                        bio_pair = 1;
                        }
                else if (strcmp(*argv,"-f") == 0)
                        {
                        force = 1;
                        }
                else
                        {
                        fprintf(stderr,"unknown option %s\n",*argv);
                        badop=1;
                        break;
                        }
                argc--;
                argv++;
                }
        if (badop)
                {
bad:
                sv_usage();
                goto end;
                }

        if (!ssl2 && !ssl3 && !tls1 && number > 1 && !reuse && !force)
                {
                fprintf(stderr, "This case cannot work.  Use -f switch to perform "
                        "the test anyway\n"
                        "(and -d to see what happens, "
                        "and -bio_pair to really make it happen :-)\n"
                        "or add one of -ssl2, -ssl3, -tls1, -reuse to "
                        "avoid protocol mismatch.\n");
                exit(1);
                }

/*      if (cipher == NULL) cipher=getenv("SSL_CIPHER"); */

        SSL_library_init();
        SSL_load_error_strings();

#if !defined(NO_SSL2) && !defined(NO_SSL3)
        if (ssl2)
                meth=SSLv2_method();
        else 
        if (tls1)
                meth=TLSv1_method();
        else
        if (ssl3)
                meth=SSLv3_method();
        else
                meth=SSLv23_method();
#else
#ifdef NO_SSL2
        meth=SSLv3_method();
#else
        meth=SSLv2_method();
#endif
#endif

        c_ctx=SSL_CTX_new(meth);
        s_ctx=SSL_CTX_new(meth);
        if ((c_ctx == NULL) || (s_ctx == NULL))
                {
                ERR_print_errors(bio_err);
                goto end;
                }

        if (cipher != NULL)
                {
                SSL_CTX_set_cipher_list(c_ctx,cipher);
                SSL_CTX_set_cipher_list(s_ctx,cipher);
                }

#ifndef NO_DH
        if (!no_dhe)
                {
# ifndef NO_DSA
                if (dhe1024) 
                        {
                        DSA *dsa;
                        unsigned char seed[20];
                        
                        if (verbose)
                                {
                                fprintf(stdout, "Creating 1024 bit DHE parameters ...");
                                fflush(stdout);
                                }
                        
                        memcpy(seed, "Random String no. 12", 20);
                        dsa = DSA_generate_parameters(1024, seed, 20, NULL, NULL, 0, NULL);
                        dh = DSA_dup_DH(dsa);   
                        DSA_free(dsa);
                        /* important: SSL_OP_SINGLE_DH_USE to avoid small subgroup attacks */
                        SSL_CTX_set_options(s_ctx, SSL_OP_SINGLE_DH_USE);
                        
                        if (verbose)
                                fprintf(stdout, " done\n");
                        }
                else
# endif
                        dh=get_dh512();
                SSL_CTX_set_tmp_dh(s_ctx,dh);
                DH_free(dh);
                }
#endif

#ifndef NO_RSA
        SSL_CTX_set_tmp_rsa_callback(s_ctx,tmp_rsa_cb);
#endif

        if (!SSL_CTX_use_certificate_file(s_ctx,server_cert,SSL_FILETYPE_PEM))
                {
                ERR_print_errors(bio_err);
                }
        else if (!SSL_CTX_use_PrivateKey_file(s_ctx,server_cert,
                SSL_FILETYPE_PEM))
                {
                ERR_print_errors(bio_err);
                goto end;
                }

        if (client_auth)
                {
                SSL_CTX_use_certificate_file(c_ctx,client_cert,
                        SSL_FILETYPE_PEM);
                SSL_CTX_use_PrivateKey_file(c_ctx,client_cert,
                        SSL_FILETYPE_PEM);
                }

        if (    (!SSL_CTX_load_verify_locations(s_ctx,CAfile,CApath)) ||
                (!SSL_CTX_set_default_verify_paths(s_ctx)) ||
                (!SSL_CTX_load_verify_locations(c_ctx,CAfile,CApath)) ||
                (!SSL_CTX_set_default_verify_paths(c_ctx)))
                {
                /* fprintf(stderr,"SSL_load_verify_locations\n"); */
                ERR_print_errors(bio_err);
                /* goto end; */
                }

        if (client_auth)
                {
                fprintf(stderr,"client authentication\n");
                SSL_CTX_set_verify(s_ctx,
                        SSL_VERIFY_PEER|SSL_VERIFY_FAIL_IF_NO_PEER_CERT,
                        verify_callback);
                }
        if (server_auth)
                {
                fprintf(stderr,"server authentication\n");
                SSL_CTX_set_verify(c_ctx,SSL_VERIFY_PEER,
                        verify_callback);
                }
        
        {
                int session_id_context = 0;
                SSL_CTX_set_session_id_context(s_ctx, (void *)&session_id_context, sizeof session_id_context);
        }

        c_ssl=SSL_new(c_ctx);
        s_ssl=SSL_new(s_ctx);

        for (i=0; i<number; i++)
                {
                if (!reuse) SSL_set_session(c_ssl,NULL);
                if (bio_pair)
                        ret=doit_biopair(s_ssl,c_ssl,bytes);
                else
                        ret=doit(s_ssl,c_ssl,bytes);
                }

        if (!verbose)
                {
                ciph=SSL_get_current_cipher(c_ssl);
                fprintf(stdout,"Protocol %s, cipher %s, %s\n",
                        SSL_get_version(c_ssl),
                        SSL_CIPHER_get_version(ciph),
                        SSL_CIPHER_get_name(ciph));
                }
        if ((number > 1) || (bytes > 1L))
                printf("%d handshakes of %ld bytes done\n",number,bytes);

        SSL_free(s_ssl);
        SSL_free(c_ssl);

end:
        if (s_ctx != NULL) SSL_CTX_free(s_ctx);
        if (c_ctx != NULL) SSL_CTX_free(c_ctx);

        if (bio_stdout != NULL) BIO_free(bio_stdout);

        ERR_free_strings();
        ERR_remove_state(0);
        EVP_cleanup();
        CRYPTO_mem_leaks(bio_err);
        if (bio_err != NULL) BIO_free(bio_err);
        EXIT(ret);
        }

int doit_biopair(SSL *s_ssl, SSL *c_ssl, long count)
        {
        long cw_num = count, cr_num = count, sw_num = count, sr_num = count;
        BIO *s_ssl_bio = NULL, *c_ssl_bio = NULL;
        BIO *server = NULL, *server_io = NULL, *client = NULL, *client_io = NULL;
        SSL_CIPHER *ciph;
        int ret = 1;
        
        size_t bufsiz = 256; /* small buffer for testing */

        if (!BIO_new_bio_pair(&server, bufsiz, &server_io, bufsiz))
                goto err;
        if (!BIO_new_bio_pair(&client, bufsiz, &client_io, bufsiz))
                goto err;
        
        s_ssl_bio = BIO_new(BIO_f_ssl());
        if (!s_ssl_bio)
                goto err;

        c_ssl_bio = BIO_new(BIO_f_ssl());
        if (!c_ssl_bio)
                goto err;

        SSL_set_connect_state(c_ssl);
        SSL_set_bio(c_ssl, client, client);
        (void)BIO_set_ssl(c_ssl_bio, c_ssl, BIO_NOCLOSE);

        SSL_set_accept_state(s_ssl);
        SSL_set_bio(s_ssl, server, server);
        (void)BIO_set_ssl(s_ssl_bio, s_ssl, BIO_NOCLOSE);

        do
                {
                /* c_ssl_bio:          SSL filter BIO
                 *
                 * client:             pseudo-I/O for SSL library
                 *
                 * client_io:          client's SSL communication; usually to be
                 *                     relayed over some I/O facility, but in this
                 *                     test program, we're the server, too:
                 *
                 * server_io:          server's SSL communication
                 *
                 * server:             pseudo-I/O for SSL library
                 *
                 * s_ssl_bio:          SSL filter BIO
                 *
                 * The client and the server each employ a "BIO pair":
                 * client + client_io, server + server_io.
                 * BIO pairs are symmetric.  A BIO pair behaves similar
                 * to a non-blocking socketpair (but both endpoints must
                 * be handled by the same thread).
                 * [Here we could connect client and server to the ends
                 * of a single BIO pair, but then this code would be less
                 * suitable as an example for BIO pairs in general.]
                 *
                 * Useful functions for querying the state of BIO pair endpoints:
                 *
                 * BIO_ctrl_pending(bio)              number of bytes we can read now
                 * BIO_ctrl_get_read_request(bio)     number of bytes needed to fulfil
                 *                                      other side's read attempt
                 * BIO_ctrl_get_write_gurantee(bio)   number of bytes we can write now
                 *
                 * ..._read_request is never more than ..._write_guarantee;
                 * it depends on the application which one you should use.
                 */

                /* We have non-blocking behaviour throughout this test program, but
                 * can be sure that there is *some* progress in each iteration; so
                 * we don't have to worry about ..._SHOULD_READ or ..._SHOULD_WRITE
                 * -- we just try everything in each iteration
                 */

                        {
                        /* CLIENT */
                
                        MS_STATIC char cbuf[1024*8];
                        int i, r;

                        if (debug)
                                if (SSL_in_init(c_ssl))
                                        printf("client waiting in SSL_connect - %s\n",
                                                SSL_state_string_long(c_ssl));

                        if (cw_num > 0)
                                {
                                /* Write to server. */
                                
                                if (cw_num > (long)sizeof cbuf)
                                        i = sizeof cbuf;
                                else
                                        i = (int)cw_num;
                                r = BIO_write(c_ssl_bio, cbuf, i);
                                if (r < 0)
                                        {
                                        if (!BIO_should_retry(c_ssl_bio))
                                                {
                                                fprintf(stderr,"ERROR in CLIENT\n");
                                                goto err;
                                                }
                                        /* BIO_should_retry(...) can just be ignored here.
                                         * The library expects us to call BIO_write with
                                         * the same arguments again, and that's what we will
                                         * do in the next iteration. */
                                        }
                                else if (r == 0)
                                        {
                                        fprintf(stderr,"SSL CLIENT STARTUP FAILED\n");
                                        goto err;
                                        }
                                else
                                        {
                                        if (debug)
                                                printf("client wrote %d\n", r);
                                        cw_num -= r;                            
                                        }
                                }

                        if (cr_num > 0)
                                {
                                /* Read from server. */

                                r = BIO_read(c_ssl_bio, cbuf, sizeof(cbuf));
                                if (r < 0)
                                        {
                                        if (!BIO_should_retry(c_ssl_bio))
                                                {
                                                fprintf(stderr,"ERROR in CLIENT\n");
                                                goto err;
                                                }
                                        /* Again, "BIO_should_retry" can be ignored. */
                                        }
                                else if (r == 0)
                                        {
                                        fprintf(stderr,"SSL CLIENT STARTUP FAILED\n");
                                        goto err;
                                        }
                                else
                                        {
                                        if (debug)
                                                printf("client read %d\n", r);
                                        cr_num -= r;
                                        }
                                }
                        }

                        {
                        /* SERVER */
                
                        MS_STATIC char sbuf[1024*8];
                        int i, r;

                        if (debug)
                                if (SSL_in_init(s_ssl))
                                        printf("server waiting in SSL_accept - %s\n",
                                                SSL_state_string_long(s_ssl));

                        if (sw_num > 0)
                                {
                                /* Write to client. */
                                
                                if (sw_num > (long)sizeof sbuf)
                                        i = sizeof sbuf;
                                else
                                        i = (int)sw_num;
                                r = BIO_write(s_ssl_bio, sbuf, i);
                                if (r < 0)
                                        {
                                        if (!BIO_should_retry(s_ssl_bio))
                                                {
                                                fprintf(stderr,"ERROR in SERVER\n");
                                                goto err;
                                                }
                                        /* Ignore "BIO_should_retry". */
                                        }
                                else if (r == 0)
                                        {
                                        fprintf(stderr,"SSL SERVER STARTUP FAILED\n");
                                        goto err;
                                        }
                                else
                                        {
                                        if (debug)
                                                printf("server wrote %d\n", r);
                                        sw_num -= r;                            
                                        }
                                }

                        if (sr_num > 0)
                                {
                                /* Read from client. */

                                r = BIO_read(s_ssl_bio, sbuf, sizeof(sbuf));
                                if (r < 0)
                                        {
                                        if (!BIO_should_retry(s_ssl_bio))
                                                {
                                                fprintf(stderr,"ERROR in SERVER\n");
                                                goto err;
                                                }
                                        /* blah, blah */
                                        }
                                else if (r == 0)
                                        {
                                        fprintf(stderr,"SSL SERVER STARTUP FAILED\n");
                                        goto err;
                                        }
                                else
                                        {
                                        if (debug)
                                                printf("server read %d\n", r);
                                        sr_num -= r;
                                        }
                                }
                        }
                        
                        {
                        /* "I/O" BETWEEN CLIENT AND SERVER. */

                        size_t r1, r2;
                        BIO *io1 = server_io, *io2 = client_io;
                        /* we use the non-copying interface for io1
                         * and the standard BIO_write/BIO_read interface for io2
                         */
                        
                        static int prev_progress = 1;
                        int progress = 0;
                        
                        /* io1 to io2 */
                        do
                                {
                                size_t num;
                                int r;

                                r1 = BIO_ctrl_pending(io1);
                                r2 = BIO_ctrl_get_write_guarantee(io2);

                                num = r1;
                                if (r2 < num)
                                        num = r2;
                                if (num)
                                        {
                                        char *dataptr;

                                        if (INT_MAX < num) /* yeah, right */
                                                num = INT_MAX;
                                        
                                        r = BIO_nread(io1, &dataptr, (int)num);
                                        assert(r > 0);
                                        assert(r <= (int)num);
                                        /* possibly r < num (non-contiguous data) */
                                        num = r;
                                        r = BIO_write(io2, dataptr, (int)num);
                                        if (r != (int)num) /* can't happen */
                                                {
                                                fprintf(stderr, "ERROR: BIO_write could not write "
                                                        "BIO_ctrl_get_write_guarantee() bytes");
                                                goto err;
                                                }
                                        progress = 1;

                                        if (debug)
                                                printf((io1 == client_io) ?
                                                        "C->S relaying: %d bytes\n" :
                                                        "S->C relaying: %d bytes\n",
                                                        (int)num);
                                        }
                                }
                        while (r1 && r2);

                        /* io2 to io1 */
                        {
                                size_t num;
                                int r;

                                r1 = BIO_ctrl_pending(io2);
                                r2 = BIO_ctrl_get_read_request(io1);
                                /* here we could use ..._get_write_guarantee instead of
                                 * ..._get_read_request, but by using the latter
                                 * we test restartability of the SSL implementation
                                 * more thoroughly */
                                num = r1;
                                if (r2 < num)
                                        num = r2;
                                if (num)
                                        {
                                        char *dataptr;
                                        
                                        if (INT_MAX < num)
                                                num = INT_MAX;

                                        if (num > 1)
                                                --num; /* test restartability even more thoroughly */
                                        
                                        r = BIO_nwrite(io1, &dataptr, (int)num);
                                        assert(r > 0);
                                        assert(r <= (int)num);
                                        num = r;
                                        r = BIO_read(io2, dataptr, (int)num);
                                        if (r != (int)num) /* can't happen */
                                                {
                                                fprintf(stderr, "ERROR: BIO_read could not read "
                                                        "BIO_ctrl_pending() bytes");
                                                goto err;
                                                }
                                        progress = 1;
                                        
                                        if (debug)
                                                printf((io2 == client_io) ?
                                                        "C->S relaying: %d bytes\n" :
                                                        "S->C relaying: %d bytes\n",
                                                        (int)num);
                                        }
                        } /* no loop, BIO_ctrl_get_read_request now returns 0 anyway */

                        if (!progress && !prev_progress)
                                if (cw_num > 0 || cr_num > 0 || sw_num > 0 || sr_num > 0)
                                        {
                                        fprintf(stderr, "ERROR: got stuck\n");
                                        if (strcmp("SSLv2", SSL_get_version(c_ssl)) == 0)
                                                {
                                                fprintf(stderr, "This can happen for SSL2 because "
                                                        "CLIENT-FINISHED and SERVER-VERIFY are written \n"
                                                        "concurrently ...");
                                                if (strncmp("2SCF", SSL_state_string(c_ssl), 4) == 0
                                                        && strncmp("2SSV", SSL_state_string(s_ssl), 4) == 0)
                                                        {
                                                        fprintf(stderr, " ok.\n");
                                                        goto end;
                                                        }
                                                }
                                        fprintf(stderr, " ERROR.\n");
                                        goto err;
                                        }
                        prev_progress = progress;
                        }
                }
        while (cw_num > 0 || cr_num > 0 || sw_num > 0 || sr_num > 0);

        ciph = SSL_get_current_cipher(c_ssl);
        if (verbose)
                fprintf(stdout,"DONE via BIO pair, protocol %s, cipher %s, %s\n",
                        SSL_get_version(c_ssl),
                        SSL_CIPHER_get_version(ciph),
                        SSL_CIPHER_get_name(ciph));
 end:
        ret = 0;

 err:
        ERR_print_errors(bio_err);
        
        if (server)
                BIO_free(server);
        if (server_io)
                BIO_free(server_io);
        if (client)
                BIO_free(client);
        if (client_io)
                BIO_free(client_io);
        if (s_ssl_bio)
                BIO_free(s_ssl_bio);
        if (c_ssl_bio)
                BIO_free(c_ssl_bio);

        return ret;
        }


#define W_READ  1
#define W_WRITE 2
#define C_DONE  1
#define S_DONE  2

int doit(SSL *s_ssl, SSL *c_ssl, long count)
        {
        MS_STATIC char cbuf[1024*8],sbuf[1024*8];
        long cw_num=count,cr_num=count;
        long sw_num=count,sr_num=count;
        int ret=1;
        BIO *c_to_s=NULL;
        BIO *s_to_c=NULL;
        BIO *c_bio=NULL;
        BIO *s_bio=NULL;
        int c_r,c_w,s_r,s_w;
        int c_want,s_want;
        int i,j;
        int done=0;
        int c_write,s_write;
        int do_server=0,do_client=0;
        SSL_CIPHER *ciph;

        c_to_s=BIO_new(BIO_s_mem());
        s_to_c=BIO_new(BIO_s_mem());
        if ((s_to_c == NULL) || (c_to_s == NULL))
                {
                ERR_print_errors(bio_err);
                goto err;
                }

        c_bio=BIO_new(BIO_f_ssl());
        s_bio=BIO_new(BIO_f_ssl());
        if ((c_bio == NULL) || (s_bio == NULL))
                {
                ERR_print_errors(bio_err);
                goto err;
                }

        SSL_set_connect_state(c_ssl);
        SSL_set_bio(c_ssl,s_to_c,c_to_s);
        BIO_set_ssl(c_bio,c_ssl,BIO_NOCLOSE);

        SSL_set_accept_state(s_ssl);
        SSL_set_bio(s_ssl,c_to_s,s_to_c);
        BIO_set_ssl(s_bio,s_ssl,BIO_NOCLOSE);

        c_r=0; s_r=1;
        c_w=1; s_w=0;
        c_want=W_WRITE;
        s_want=0;
        c_write=1,s_write=0;

        /* We can always do writes */
        for (;;)
                {
                do_server=0;
                do_client=0;

                i=(int)BIO_pending(s_bio);
                if ((i && s_r) || s_w) do_server=1;

                i=(int)BIO_pending(c_bio);
                if ((i && c_r) || c_w) do_client=1;

                if (do_server && debug)
                        {
                        if (SSL_in_init(s_ssl))
                                printf("server waiting in SSL_accept - %s\n",
                                        SSL_state_string_long(s_ssl));
/*                      else if (s_write)
                                printf("server:SSL_write()\n");
                        else
                                printf("server:SSL_read()\n"); */
                        }

                if (do_client && debug)
                        {
                        if (SSL_in_init(c_ssl))
                                printf("client waiting in SSL_connect - %s\n",
                                        SSL_state_string_long(c_ssl));
/*                      else if (c_write)
                                printf("client:SSL_write()\n");
                        else
                                printf("client:SSL_read()\n"); */
                        }

                if (!do_client && !do_server)
                        {
                        fprintf(stdout,"ERROR IN STARTUP\n");
                        ERR_print_errors(bio_err);
                        break;
                        }
                if (do_client && !(done & C_DONE))
                        {
                        if (c_write)
                                {
                                j=(cw_num > (long)sizeof(cbuf))
                                        ?sizeof(cbuf):(int)cw_num;
                                i=BIO_write(c_bio,cbuf,j);
                                if (i < 0)
                                        {
                                        c_r=0;
                                        c_w=0;
                                        if (BIO_should_retry(c_bio))
                                                {
                                                if (BIO_should_read(c_bio))
                                                        c_r=1;
                                                if (BIO_should_write(c_bio))
                                                        c_w=1;
                                                }
                                        else
                                                {
                                                fprintf(stderr,"ERROR in CLIENT\n");
                                                ERR_print_errors(bio_err);
                                                goto err;
                                                }
                                        }
                                else if (i == 0)
                                        {
                                        fprintf(stderr,"SSL CLIENT STARTUP FAILED\n");
                                        goto err;
                                        }
                                else
                                        {
                                        if (debug)
                                                printf("client wrote %d\n",i);
                                        /* ok */
                                        s_r=1;
                                        c_write=0;
                                        cw_num-=i;
                                        }
                                }
                        else
                                {
                                i=BIO_read(c_bio,cbuf,sizeof(cbuf));
                                if (i < 0)
                                        {
                                        c_r=0;
                                        c_w=0;
                                        if (BIO_should_retry(c_bio))
                                                {
                                                if (BIO_should_read(c_bio))
                                                        c_r=1;
                                                if (BIO_should_write(c_bio))
                                                        c_w=1;
                                                }
                                        else
                                                {
                                                fprintf(stderr,"ERROR in CLIENT\n");
                                                ERR_print_errors(bio_err);
                                                goto err;
                                                }
                                        }
                                else if (i == 0)
                                        {
                                        fprintf(stderr,"SSL CLIENT STARTUP FAILED\n");
                                        goto err;
                                        }
                                else
                                        {
                                        if (debug)
                                                printf("client read %d\n",i);
                                        cr_num-=i;
                                        if (sw_num > 0)
                                                {
                                                s_write=1;
                                                s_w=1;
                                                }
                                        if (cr_num <= 0)
                                                {
                                                s_write=1;
                                                s_w=1;
                                                done=S_DONE|C_DONE;
                                                }
                                        }
                                }
                        }

                if (do_server && !(done & S_DONE))
                        {
                        if (!s_write)
                                {
                                i=BIO_read(s_bio,sbuf,sizeof(cbuf));
                                if (i < 0)
                                        {
                                        s_r=0;
                                        s_w=0;
                                        if (BIO_should_retry(s_bio))
                                                {
                                                if (BIO_should_read(s_bio))
                                                        s_r=1;
                                                if (BIO_should_write(s_bio))
                                                        s_w=1;
                                                }
                                        else
                                                {
                                                fprintf(stderr,"ERROR in SERVER\n");
                                                ERR_print_errors(bio_err);
                                                goto err;
                                                }
                                        }
                                else if (i == 0)
                                        {
                                        ERR_print_errors(bio_err);
                                        fprintf(stderr,"SSL SERVER STARTUP FAILED in SSL_read\n");
                                        goto err;
                                        }
                                else
                                        {
                                        if (debug)
                                                printf("server read %d\n",i);
                                        sr_num-=i;
                                        if (cw_num > 0)
                                                {
                                                c_write=1;
                                                c_w=1;
                                                }
                                        if (sr_num <= 0)
                                                {
                                                s_write=1;
                                                s_w=1;
                                                c_write=0;
                                                }
                                        }
                                }
                        else
                                {
                                j=(sw_num > (long)sizeof(sbuf))?
                                        sizeof(sbuf):(int)sw_num;
                                i=BIO_write(s_bio,sbuf,j);
                                if (i < 0)
                                        {
                                        s_r=0;
                                        s_w=0;
                                        if (BIO_should_retry(s_bio))
                                                {
                                                if (BIO_should_read(s_bio))
                                                        s_r=1;
                                                if (BIO_should_write(s_bio))
                                                        s_w=1;
                                                }
                                        else
                                                {
                                                fprintf(stderr,"ERROR in SERVER\n");
                                                ERR_print_errors(bio_err);
                                                goto err;
                                                }
                                        }
                                else if (i == 0)
                                        {
                                        ERR_print_errors(bio_err);
                                        fprintf(stderr,"SSL SERVER STARTUP FAILED in SSL_write\n");
                                        goto err;
                                        }
                                else
                                        {
                                        if (debug)
                                                printf("server wrote %d\n",i);
                                        sw_num-=i;
                                        s_write=0;
                                        c_r=1;
                                        if (sw_num <= 0)
                                                done|=S_DONE;
                                        }
                                }
                        }

                if ((done & S_DONE) && (done & C_DONE)) break;
                }

        ciph=SSL_get_current_cipher(c_ssl);
        if (verbose)
                fprintf(stdout,"DONE, protocol %s, cipher %s, %s\n",
                        SSL_get_version(c_ssl),
                        SSL_CIPHER_get_version(ciph),
                        SSL_CIPHER_get_name(ciph));
        ret=0;
err:
        /* We have to set the BIO's to NULL otherwise they will be
         * Free()ed twice.  Once when th s_ssl is SSL_free()ed and
         * again when c_ssl is SSL_free()ed.
         * This is a hack required because s_ssl and c_ssl are sharing the same
         * BIO structure and SSL_set_bio() and SSL_free() automatically
         * BIO_free non NULL entries.
         * You should not normally do this or be required to do this */
        if (s_ssl != NULL)
                {
                s_ssl->rbio=NULL;
                s_ssl->wbio=NULL;
                }
        if (c_ssl != NULL)
                {
                c_ssl->rbio=NULL;
                c_ssl->wbio=NULL;
                }

        if (c_to_s != NULL) BIO_free(c_to_s);
        if (s_to_c != NULL) BIO_free(s_to_c);
        if (c_bio != NULL) BIO_free_all(c_bio);
        if (s_bio != NULL) BIO_free_all(s_bio);
        return(ret);
        }

static int MS_CALLBACK verify_callback(int ok, X509_STORE_CTX *ctx)
        {
        char *s,buf[256];

        s=X509_NAME_oneline(X509_get_subject_name(ctx->current_cert),buf,256);
        if (s != NULL)
                {
                if (ok)
                        fprintf(stderr,"depth=%d %s\n",ctx->error_depth,buf);
                else
                        fprintf(stderr,"depth=%d error=%d %s\n",
                                ctx->error_depth,ctx->error,buf);
                }

        if (ok == 0)
                {
                switch (ctx->error)
                        {
                case X509_V_ERR_CERT_NOT_YET_VALID:
                case X509_V_ERR_CERT_HAS_EXPIRED:
                case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
                        ok=1;
                        }
                }

        return(ok);
        }

#ifndef NO_DH
static unsigned char dh512_p[]={
        0xDA,0x58,0x3C,0x16,0xD9,0x85,0x22,0x89,0xD0,0xE4,0xAF,0x75,
        0x6F,0x4C,0xCA,0x92,0xDD,0x4B,0xE5,0x33,0xB8,0x04,0xFB,0x0F,
        0xED,0x94,0xEF,0x9C,0x8A,0x44,0x03,0xED,0x57,0x46,0x50,0xD3,
        0x69,0x99,0xDB,0x29,0xD7,0x76,0x27,0x6B,0xA2,0xD3,0xD4,0x12,
        0xE2,0x18,0xF4,0xDD,0x1E,0x08,0x4C,0xF6,0xD8,0x00,0x3E,0x7C,
        0x47,0x74,0xE8,0x33,
        };
static unsigned char dh512_g[]={
        0x02,
        };

static DH *get_dh512(void)
        {
        DH *dh=NULL;

        if ((dh=DH_new()) == NULL) return(NULL);
        dh->p=BN_bin2bn(dh512_p,sizeof(dh512_p),NULL);
        dh->g=BN_bin2bn(dh512_g,sizeof(dh512_g),NULL);
        if ((dh->p == NULL) || (dh->g == NULL))
                return(NULL);
        return(dh);
        }
#endif

#ifndef NO_RSA
static RSA MS_CALLBACK *tmp_rsa_cb(SSL *s, int is_export, int keylength)
        {
        static RSA *rsa_tmp=NULL;

        if (rsa_tmp == NULL)
                {
                BIO_printf(bio_err,"Generating temp (%d bit) RSA key...",keylength);
                (void)BIO_flush(bio_err);
                rsa_tmp=RSA_generate_key(keylength,RSA_F4,NULL,NULL);
                BIO_printf(bio_err,"\n");
                (void)BIO_flush(bio_err);
                }
        return(rsa_tmp);
        }
#endif