Security fixes brought forward from 0.9.7.

[thirdparty/openssl.git] / apps / s_client.c

/* apps/s_client.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.]
 */
/* ====================================================================
 * Copyright (c) 1998-2001 The OpenSSL Project.  All rights reserved.
 *
 * 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 above 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 acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    openssl-core@openssl.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED 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 OpenSSL PROJECT OR
 * ITS 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.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/e_os2.h>
#ifdef OPENSSL_NO_STDIO
#define APPS_WIN16
#endif

/* With IPv6, it looks like Digital has mixed up the proper order of
   recursive header file inclusion, resulting in the compiler complaining
   that u_int isn't defined, but only if _POSIX_C_SOURCE is defined, which
   is needed to have fileno() declared correctly...  So let's define u_int */
#if defined(OPENSSL_SYS_VMS_DECC) && !defined(__U_INT)
#define __U_INT
typedef unsigned int u_int;
#endif

#define USE_SOCKETS
#include "apps.h"
#include <openssl/x509.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/pem.h>
#include <openssl/rand.h>
#include "s_apps.h"

#ifdef OPENSSL_SYS_WINDOWS
#include <conio.h>
#endif


#if (defined(OPENSSL_SYS_VMS) && __VMS_VER < 70000000)
/* FIONBIO used as a switch to enable ioctl, and that isn't in VMS < 7.0 */
#undef FIONBIO
#endif

#undef PROG
#define PROG    s_client_main

/*#define SSL_HOST_NAME "www.netscape.com" */
/*#define SSL_HOST_NAME "193.118.187.102" */
#define SSL_HOST_NAME   "localhost"

/*#define TEST_CERT "client.pem" */ /* no default cert. */

#undef BUFSIZZ
#define BUFSIZZ 1024*8

extern int verify_depth;
extern int verify_error;

#ifdef FIONBIO
static int c_nbio=0;
#endif
static int c_Pause=0;
static int c_debug=0;
static int c_msg=0;
static int c_showcerts=0;

static void sc_usage(void);
static void print_stuff(BIO *berr,SSL *con,int full);
static BIO *bio_c_out=NULL;
static int c_quiet=0;
static int c_ign_eof=0;

static void sc_usage(void)
        {
        BIO_printf(bio_err,"usage: s_client args\n");
        BIO_printf(bio_err,"\n");
        BIO_printf(bio_err," -host host     - use -connect instead\n");
        BIO_printf(bio_err," -port port     - use -connect instead\n");
        BIO_printf(bio_err," -connect host:port - who to connect to (default is %s:%s)\n",SSL_HOST_NAME,PORT_STR);

        BIO_printf(bio_err," -verify arg   - turn on peer certificate verification\n");
        BIO_printf(bio_err," -cert arg     - certificate file to use, PEM format assumed\n");
        BIO_printf(bio_err," -key arg      - Private key file to use, PEM format assumed, in cert file if\n");
        BIO_printf(bio_err,"                 not specified but cert file is.\n");
        BIO_printf(bio_err," -CApath arg   - PEM format directory of CA's\n");
        BIO_printf(bio_err," -CAfile arg   - PEM format file of CA's\n");
        BIO_printf(bio_err," -reconnect    - Drop and re-make the connection with the same Session-ID\n");
        BIO_printf(bio_err," -pause        - sleep(1) after each read(2) and write(2) system call\n");
        BIO_printf(bio_err," -showcerts    - show all certificates in the chain\n");
        BIO_printf(bio_err," -debug        - extra output\n");
        BIO_printf(bio_err," -msg          - Show protocol messages\n");
        BIO_printf(bio_err," -nbio_test    - more ssl protocol testing\n");
        BIO_printf(bio_err," -state        - print the 'ssl' states\n");
#ifdef FIONBIO
        BIO_printf(bio_err," -nbio         - Run with non-blocking IO\n");
#endif
        BIO_printf(bio_err," -crlf         - convert LF from terminal into CRLF\n");
        BIO_printf(bio_err," -quiet        - no s_client output\n");
        BIO_printf(bio_err," -ign_eof      - ignore input eof (default when -quiet)\n");
        BIO_printf(bio_err," -ssl2         - just use SSLv2\n");
        BIO_printf(bio_err," -ssl3         - just use SSLv3\n");
        BIO_printf(bio_err," -tls1         - just use TLSv1\n");
        BIO_printf(bio_err," -no_tls1/-no_ssl3/-no_ssl2 - turn off that protocol\n");
        BIO_printf(bio_err," -bugs         - Switch on all SSL implementation bug workarounds\n");
        BIO_printf(bio_err," -serverpref   - Use server's cipher preferences (only SSLv2)\n");
        BIO_printf(bio_err," -cipher       - preferred cipher to use, use the 'openssl ciphers'\n");
        BIO_printf(bio_err,"                 command to see what is available\n");
        BIO_printf(bio_err," -starttls prot - use the STARTTLS command before starting TLS\n");
        BIO_printf(bio_err,"                 for those protocols that support it, where\n");
        BIO_printf(bio_err,"                 'prot' defines which one to assume.  Currently,\n");
        BIO_printf(bio_err,"                 only \"smtp\" is supported.\n");
        BIO_printf(bio_err," -engine id    - Initialise and use the specified engine\n");
        BIO_printf(bio_err," -rand file%cfile%c...\n", LIST_SEPARATOR_CHAR, LIST_SEPARATOR_CHAR);

        }

int MAIN(int, char **);

int MAIN(int argc, char **argv)
        {
        int off=0;
        SSL *con=NULL,*con2=NULL;
        X509_STORE *store = NULL;
        int s,k,width,state=0;
        char *cbuf=NULL,*sbuf=NULL,*mbuf=NULL;
        int cbuf_len,cbuf_off;
        int sbuf_len,sbuf_off;
        fd_set readfds,writefds;
        short port=PORT;
        int full_log=1;
        char *host=SSL_HOST_NAME;
        char *cert_file=NULL,*key_file=NULL;
        char *CApath=NULL,*CAfile=NULL,*cipher=NULL;
        int reconnect=0,badop=0,verify=SSL_VERIFY_NONE,bugs=0;
        int crlf=0;
        int write_tty,read_tty,write_ssl,read_ssl,tty_on,ssl_pending;
        SSL_CTX *ctx=NULL;
        int ret=1,in_init=1,i,nbio_test=0;
        int smtp_starttls = 0;
        int prexit = 0, vflags = 0;
        SSL_METHOD *meth=NULL;
        BIO *sbio;
        char *inrand=NULL;
        char *engine_id=NULL;
        ENGINE *e=NULL;
#ifdef OPENSSL_SYS_WINDOWS
        struct timeval tv;
#endif

#if !defined(OPENSSL_NO_SSL2) && !defined(OPENSSL_NO_SSL3)
        meth=SSLv23_client_method();
#elif !defined(OPENSSL_NO_SSL3)
        meth=SSLv3_client_method();
#elif !defined(OPENSSL_NO_SSL2)
        meth=SSLv2_client_method();
#endif

        apps_startup();
        c_Pause=0;
        c_quiet=0;
        c_ign_eof=0;
        c_debug=0;
        c_msg=0;
        c_showcerts=0;

        if (bio_err == NULL)
                bio_err=BIO_new_fp(stderr,BIO_NOCLOSE);

        if (!load_config(bio_err, NULL))
                goto end;

        if (    ((cbuf=OPENSSL_malloc(BUFSIZZ)) == NULL) ||
                ((sbuf=OPENSSL_malloc(BUFSIZZ)) == NULL) ||
                ((mbuf=OPENSSL_malloc(BUFSIZZ)) == NULL))
                {
                BIO_printf(bio_err,"out of memory\n");
                goto end;
                }

        verify_depth=0;
        verify_error=X509_V_OK;
#ifdef FIONBIO
        c_nbio=0;
#endif

        argc--;
        argv++;
        while (argc >= 1)
                {
                if      (strcmp(*argv,"-host") == 0)
                        {
                        if (--argc < 1) goto bad;
                        host= *(++argv);
                        }
                else if (strcmp(*argv,"-port") == 0)
                        {
                        if (--argc < 1) goto bad;
                        port=atoi(*(++argv));
                        if (port == 0) goto bad;
                        }
                else if (strcmp(*argv,"-connect") == 0)
                        {
                        if (--argc < 1) goto bad;
                        if (!extract_host_port(*(++argv),&host,NULL,&port))
                                goto bad;
                        }
                else if (strcmp(*argv,"-verify") == 0)
                        {
                        verify=SSL_VERIFY_PEER;
                        if (--argc < 1) goto bad;
                        verify_depth=atoi(*(++argv));
                        BIO_printf(bio_err,"verify depth is %d\n",verify_depth);
                        }
                else if (strcmp(*argv,"-cert") == 0)
                        {
                        if (--argc < 1) goto bad;
                        cert_file= *(++argv);
                        }
                else if (strcmp(*argv,"-crl_check") == 0)
                        vflags |= X509_V_FLAG_CRL_CHECK;
                else if (strcmp(*argv,"-crl_check_all") == 0)
                        vflags |= X509_V_FLAG_CRL_CHECK|X509_V_FLAG_CRL_CHECK_ALL;
                else if (strcmp(*argv,"-prexit") == 0)
                        prexit=1;
                else if (strcmp(*argv,"-crlf") == 0)
                        crlf=1;
                else if (strcmp(*argv,"-quiet") == 0)
                        {
                        c_quiet=1;
                        c_ign_eof=1;
                        }
                else if (strcmp(*argv,"-ign_eof") == 0)
                        c_ign_eof=1;
                else if (strcmp(*argv,"-pause") == 0)
                        c_Pause=1;
                else if (strcmp(*argv,"-debug") == 0)
                        c_debug=1;
                else if (strcmp(*argv,"-msg") == 0)
                        c_msg=1;
                else if (strcmp(*argv,"-showcerts") == 0)
                        c_showcerts=1;
                else if (strcmp(*argv,"-nbio_test") == 0)
                        nbio_test=1;
                else if (strcmp(*argv,"-state") == 0)
                        state=1;
#ifndef OPENSSL_NO_SSL2
                else if (strcmp(*argv,"-ssl2") == 0)
                        meth=SSLv2_client_method();
#endif
#ifndef OPENSSL_NO_SSL3
                else if (strcmp(*argv,"-ssl3") == 0)
                        meth=SSLv3_client_method();
#endif
#ifndef OPENSSL_NO_TLS1
                else if (strcmp(*argv,"-tls1") == 0)
                        meth=TLSv1_client_method();
#endif
                else if (strcmp(*argv,"-bugs") == 0)
                        bugs=1;
                else if (strcmp(*argv,"-key") == 0)
                        {
                        if (--argc < 1) goto bad;
                        key_file= *(++argv);
                        }
                else if (strcmp(*argv,"-reconnect") == 0)
                        {
                        reconnect=5;
                        }
                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,"-no_tls1") == 0)
                        off|=SSL_OP_NO_TLSv1;
                else if (strcmp(*argv,"-no_ssl3") == 0)
                        off|=SSL_OP_NO_SSLv3;
                else if (strcmp(*argv,"-no_ssl2") == 0)
                        off|=SSL_OP_NO_SSLv2;
                else if (strcmp(*argv,"-serverpref") == 0)
                        off|=SSL_OP_CIPHER_SERVER_PREFERENCE;
                else if (strcmp(*argv,"-cipher") == 0)
                        {
                        if (--argc < 1) goto bad;
                        cipher= *(++argv);
                        }
#ifdef FIONBIO
                else if (strcmp(*argv,"-nbio") == 0)
                        { c_nbio=1; }
#endif
                else if (strcmp(*argv,"-starttls") == 0)
                        {
                        if (--argc < 1) goto bad;
                        ++argv;
                        if (strcmp(*argv,"smtp") == 0)
                                smtp_starttls = 1;
                        else
                                goto bad;
                        }
                else if (strcmp(*argv,"-engine") == 0)
                        {
                        if (--argc < 1) goto bad;
                        engine_id = *(++argv);
                        }
                else if (strcmp(*argv,"-rand") == 0)
                        {
                        if (--argc < 1) goto bad;
                        inrand= *(++argv);
                        }
                else
                        {
                        BIO_printf(bio_err,"unknown option %s\n",*argv);
                        badop=1;
                        break;
                        }
                argc--;
                argv++;
                }
        if (badop)
                {
bad:
                sc_usage();
                goto end;
                }

        OpenSSL_add_ssl_algorithms();
        SSL_load_error_strings();

        e = setup_engine(bio_err, engine_id, 1);

        if (!app_RAND_load_file(NULL, bio_err, 1) && inrand == NULL
                && !RAND_status())
                {
                BIO_printf(bio_err,"warning, not much extra random data, consider using the -rand option\n");
                }
        if (inrand != NULL)
                BIO_printf(bio_err,"%ld semi-random bytes loaded\n",
                        app_RAND_load_files(inrand));

        if (bio_c_out == NULL)
                {
                if (c_quiet && !c_debug && !c_msg)
                        {
                        bio_c_out=BIO_new(BIO_s_null());
                        }
                else
                        {
                        if (bio_c_out == NULL)
                                bio_c_out=BIO_new_fp(stdout,BIO_NOCLOSE);
                        }
                }

        ctx=SSL_CTX_new(meth);
        if (ctx == NULL)
                {
                ERR_print_errors(bio_err);
                goto end;
                }

        if (bugs)
                SSL_CTX_set_options(ctx,SSL_OP_ALL|off);
        else
                SSL_CTX_set_options(ctx,off);

        if (state) SSL_CTX_set_info_callback(ctx,apps_ssl_info_callback);
        if (cipher != NULL)
                if(!SSL_CTX_set_cipher_list(ctx,cipher)) {
                BIO_printf(bio_err,"error setting cipher list\n");
                ERR_print_errors(bio_err);
                goto end;
        }
#if 0
        else
                SSL_CTX_set_cipher_list(ctx,getenv("SSL_CIPHER"));
#endif

        SSL_CTX_set_verify(ctx,verify,verify_callback);
        if (!set_cert_stuff(ctx,cert_file,key_file))
                goto end;

        if ((!SSL_CTX_load_verify_locations(ctx,CAfile,CApath)) ||
                (!SSL_CTX_set_default_verify_paths(ctx)))
                {
                /* BIO_printf(bio_err,"error setting default verify locations\n"); */
                ERR_print_errors(bio_err);
                /* goto end; */
                }

        store = SSL_CTX_get_cert_store(ctx);
        X509_STORE_set_flags(store, vflags);

        con=SSL_new(ctx);
#ifndef OPENSSL_NO_KRB5
        if (con  &&  (con->kssl_ctx = kssl_ctx_new()) != NULL)
                {
                kssl_ctx_setstring(con->kssl_ctx, KSSL_SERVER, host);
                }
#endif  /* OPENSSL_NO_KRB5  */
/*      SSL_set_cipher_list(con,"RC4-MD5"); */

re_start:

        if (init_client(&s,host,port) == 0)
                {
                BIO_printf(bio_err,"connect:errno=%d\n",get_last_socket_error());
                SHUTDOWN(s);
                goto end;
                }
        BIO_printf(bio_c_out,"CONNECTED(%08X)\n",s);

#ifdef FIONBIO
        if (c_nbio)
                {
                unsigned long l=1;
                BIO_printf(bio_c_out,"turning on non blocking io\n");
                if (BIO_socket_ioctl(s,FIONBIO,&l) < 0)
                        {
                        ERR_print_errors(bio_err);
                        goto end;
                        }
                }
#endif                                              
        if (c_Pause & 0x01) con->debug=1;
        sbio=BIO_new_socket(s,BIO_NOCLOSE);

        if (nbio_test)
                {
                BIO *test;

                test=BIO_new(BIO_f_nbio_test());
                sbio=BIO_push(test,sbio);
                }

        if (c_debug)
                {
                con->debug=1;
                BIO_set_callback(sbio,bio_dump_cb);
                BIO_set_callback_arg(sbio,bio_c_out);
                }
        if (c_msg)
                {
                SSL_set_msg_callback(con, msg_cb);
                SSL_set_msg_callback_arg(con, bio_c_out);
                }

        SSL_set_bio(con,sbio,sbio);
        SSL_set_connect_state(con);

        /* ok, lets connect */
        width=SSL_get_fd(con)+1;

        read_tty=1;
        write_tty=0;
        tty_on=0;
        read_ssl=1;
        write_ssl=1;
        
        cbuf_len=0;
        cbuf_off=0;
        sbuf_len=0;
        sbuf_off=0;

        /* This is an ugly hack that does a lot of assumptions */
        if (smtp_starttls)
                {
                BIO_read(sbio,mbuf,BUFSIZZ);
                BIO_printf(sbio,"STARTTLS\r\n");
                BIO_read(sbio,sbuf,BUFSIZZ);
                }

        for (;;)
                {
                FD_ZERO(&readfds);
                FD_ZERO(&writefds);

                if (SSL_in_init(con) && !SSL_total_renegotiations(con))
                        {
                        in_init=1;
                        tty_on=0;
                        }
                else
                        {
                        tty_on=1;
                        if (in_init)
                                {
                                in_init=0;
                                print_stuff(bio_c_out,con,full_log);
                                if (full_log > 0) full_log--;

                                if (smtp_starttls)
                                        {
                                        BIO_printf(bio_err,"%s",mbuf);
                                        /* We don't need to know any more */
                                        smtp_starttls = 0;
                                        }

                                if (reconnect)
                                        {
                                        reconnect--;
                                        BIO_printf(bio_c_out,"drop connection and then reconnect\n");
                                        SSL_shutdown(con);
                                        SSL_set_connect_state(con);
                                        SHUTDOWN(SSL_get_fd(con));
                                        goto re_start;
                                        }
                                }
                        }

                ssl_pending = read_ssl && SSL_pending(con);

                if (!ssl_pending)
                        {
#ifndef OPENSSL_SYS_WINDOWS
                        if (tty_on)
                                {
                                if (read_tty)  FD_SET(fileno(stdin),&readfds);
                                if (write_tty) FD_SET(fileno(stdout),&writefds);
                                }
                        if (read_ssl)
                                FD_SET(SSL_get_fd(con),&readfds);
                        if (write_ssl)
                                FD_SET(SSL_get_fd(con),&writefds);
#else
                        if(!tty_on || !write_tty) {
                                if (read_ssl)
                                        FD_SET(SSL_get_fd(con),&readfds);
                                if (write_ssl)
                                        FD_SET(SSL_get_fd(con),&writefds);
                        }
#endif
/*                      printf("mode tty(%d %d%d) ssl(%d%d)\n",
                                tty_on,read_tty,write_tty,read_ssl,write_ssl);*/

                        /* Note: under VMS with SOCKETSHR the second parameter
                         * is currently of type (int *) whereas under other
                         * systems it is (void *) if you don't have a cast it
                         * will choke the compiler: if you do have a cast then
                         * you can either go for (int *) or (void *).
                         */
#ifdef OPENSSL_SYS_WINDOWS
                        /* Under Windows we make the assumption that we can
                         * always write to the tty: therefore if we need to
                         * write to the tty we just fall through. Otherwise
                         * we timeout the select every second and see if there
                         * are any keypresses. Note: this is a hack, in a proper
                         * Windows application we wouldn't do this.
                         */
                        i=0;
                        if(!write_tty) {
                                if(read_tty) {
                                        tv.tv_sec = 1;
                                        tv.tv_usec = 0;
                                        i=select(width,(void *)&readfds,(void *)&writefds,
                                                 NULL,&tv);
                                        if(!i && (!((_kbhit()) || (WAIT_OBJECT_0 == WaitForSingleObject(GetStdHandle(STD_INPUT_HANDLE), 0))) || !read_tty) ) continue;
                                } else  i=select(width,(void *)&readfds,(void *)&writefds,
                                         NULL,NULL);
                        }
#else
                        i=select(width,(void *)&readfds,(void *)&writefds,
                                 NULL,NULL);
#endif
                        if ( i < 0)
                                {
                                BIO_printf(bio_err,"bad select %d\n",
                                get_last_socket_error());
                                goto shut;
                                /* goto end; */
                                }
                        }

                if (!ssl_pending && FD_ISSET(SSL_get_fd(con),&writefds))
                        {
                        k=SSL_write(con,&(cbuf[cbuf_off]),
                                (unsigned int)cbuf_len);
                        switch (SSL_get_error(con,k))
                                {
                        case SSL_ERROR_NONE:
                                cbuf_off+=k;
                                cbuf_len-=k;
                                if (k <= 0) goto end;
                                /* we have done a  write(con,NULL,0); */
                                if (cbuf_len <= 0)
                                        {
                                        read_tty=1;
                                        write_ssl=0;
                                        }
                                else /* if (cbuf_len > 0) */
                                        {
                                        read_tty=0;
                                        write_ssl=1;
                                        }
                                break;
                        case SSL_ERROR_WANT_WRITE:
                                BIO_printf(bio_c_out,"write W BLOCK\n");
                                write_ssl=1;
                                read_tty=0;
                                break;
                        case SSL_ERROR_WANT_READ:
                                BIO_printf(bio_c_out,"write R BLOCK\n");
                                write_tty=0;
                                read_ssl=1;
                                write_ssl=0;
                                break;
                        case SSL_ERROR_WANT_X509_LOOKUP:
                                BIO_printf(bio_c_out,"write X BLOCK\n");
                                break;
                        case SSL_ERROR_ZERO_RETURN:
                                if (cbuf_len != 0)
                                        {
                                        BIO_printf(bio_c_out,"shutdown\n");
                                        goto shut;
                                        }
                                else
                                        {
                                        read_tty=1;
                                        write_ssl=0;
                                        break;
                                        }
                                
                        case SSL_ERROR_SYSCALL:
                                if ((k != 0) || (cbuf_len != 0))
                                        {
                                        BIO_printf(bio_err,"write:errno=%d\n",
                                                get_last_socket_error());
                                        goto shut;
                                        }
                                else
                                        {
                                        read_tty=1;
                                        write_ssl=0;
                                        }
                                break;
                        case SSL_ERROR_SSL:
                                ERR_print_errors(bio_err);
                                goto shut;
                                }
                        }
#ifdef OPENSSL_SYS_WINDOWS
                /* Assume Windows can always write */
                else if (!ssl_pending && write_tty)
#else
                else if (!ssl_pending && FD_ISSET(fileno(stdout),&writefds))
#endif
                        {
#ifdef CHARSET_EBCDIC
                        ascii2ebcdic(&(sbuf[sbuf_off]),&(sbuf[sbuf_off]),sbuf_len);
#endif
                        i=write(fileno(stdout),&(sbuf[sbuf_off]),sbuf_len);

                        if (i <= 0)
                                {
                                BIO_printf(bio_c_out,"DONE\n");
                                goto shut;
                                /* goto end; */
                                }

                        sbuf_len-=i;;
                        sbuf_off+=i;
                        if (sbuf_len <= 0)
                                {
                                read_ssl=1;
                                write_tty=0;
                                }
                        }
                else if (ssl_pending || FD_ISSET(SSL_get_fd(con),&readfds))
                        {
#ifdef RENEG
{ static int iiii; if (++iiii == 52) { SSL_renegotiate(con); iiii=0; } }
#endif
#if 1
                        k=SSL_read(con,sbuf,1024 /* BUFSIZZ */ );
#else
/* Demo for pending and peek :-) */
                        k=SSL_read(con,sbuf,16);
{ char zbuf[10240]; 
printf("read=%d pending=%d peek=%d\n",k,SSL_pending(con),SSL_peek(con,zbuf,10240));
}
#endif

                        switch (SSL_get_error(con,k))
                                {
                        case SSL_ERROR_NONE:
                                if (k <= 0)
                                        goto end;
                                sbuf_off=0;
                                sbuf_len=k;

                                read_ssl=0;
                                write_tty=1;
                                break;
                        case SSL_ERROR_WANT_WRITE:
                                BIO_printf(bio_c_out,"read W BLOCK\n");
                                write_ssl=1;
                                read_tty=0;
                                break;
                        case SSL_ERROR_WANT_READ:
                                BIO_printf(bio_c_out,"read R BLOCK\n");
                                write_tty=0;
                                read_ssl=1;
                                if ((read_tty == 0) && (write_ssl == 0))
                                        write_ssl=1;
                                break;
                        case SSL_ERROR_WANT_X509_LOOKUP:
                                BIO_printf(bio_c_out,"read X BLOCK\n");
                                break;
                        case SSL_ERROR_SYSCALL:
                                BIO_printf(bio_err,"read:errno=%d\n",get_last_socket_error());
                                goto shut;
                        case SSL_ERROR_ZERO_RETURN:
                                BIO_printf(bio_c_out,"closed\n");
                                goto shut;
                        case SSL_ERROR_SSL:
                                ERR_print_errors(bio_err);
                                goto shut;
                                /* break; */
                                }
                        }

#ifdef OPENSSL_SYS_WINDOWS
                else if ((_kbhit()) || (WAIT_OBJECT_0 == WaitForSingleObject(GetStdHandle(STD_INPUT_HANDLE), 0)))
#else
                else if (FD_ISSET(fileno(stdin),&readfds))
#endif
                        {
                        if (crlf)
                                {
                                int j, lf_num;

                                i=read(fileno(stdin),cbuf,BUFSIZZ/2);
                                lf_num = 0;
                                /* both loops are skipped when i <= 0 */
                                for (j = 0; j < i; j++)
                                        if (cbuf[j] == '\n')
                                                lf_num++;
                                for (j = i-1; j >= 0; j--)
                                        {
                                        cbuf[j+lf_num] = cbuf[j];
                                        if (cbuf[j] == '\n')
                                                {
                                                lf_num--;
                                                i++;
                                                cbuf[j+lf_num] = '\r';
                                                }
                                        }
                                assert(lf_num == 0);
                                }
                        else
                                i=read(fileno(stdin),cbuf,BUFSIZZ);

                        if ((!c_ign_eof) && ((i <= 0) || (cbuf[0] == 'Q')))
                                {
                                BIO_printf(bio_err,"DONE\n");
                                goto shut;
                                }

                        if ((!c_ign_eof) && (cbuf[0] == 'R'))
                                {
                                BIO_printf(bio_err,"RENEGOTIATING\n");
                                SSL_renegotiate(con);
                                cbuf_len=0;
                                }
                        else
                                {
                                cbuf_len=i;
                                cbuf_off=0;
#ifdef CHARSET_EBCDIC
                                ebcdic2ascii(cbuf, cbuf, i);
#endif
                                }

                        write_ssl=1;
                        read_tty=0;
                        }
                }
shut:
        SSL_shutdown(con);
        SHUTDOWN(SSL_get_fd(con));
        ret=0;
end:
        if(prexit) print_stuff(bio_c_out,con,1);
        if (con != NULL) SSL_free(con);
        if (con2 != NULL) SSL_free(con2);
        if (ctx != NULL) SSL_CTX_free(ctx);
        if (cbuf != NULL) { memset(cbuf,0,BUFSIZZ); OPENSSL_free(cbuf); }
        if (sbuf != NULL) { memset(sbuf,0,BUFSIZZ); OPENSSL_free(sbuf); }
        if (mbuf != NULL) { memset(mbuf,0,BUFSIZZ); OPENSSL_free(mbuf); }
        if (bio_c_out != NULL)
                {
                BIO_free(bio_c_out);
                bio_c_out=NULL;
                }
        apps_shutdown();
        EXIT(ret);
        }


static void print_stuff(BIO *bio, SSL *s, int full)
        {
        X509 *peer=NULL;
        char *p;
        static char *space="                ";
        char buf[BUFSIZ];
        STACK_OF(X509) *sk;
        STACK_OF(X509_NAME) *sk2;
        SSL_CIPHER *c;
        X509_NAME *xn;
        int j,i;

        if (full)
                {
                int got_a_chain = 0;

                sk=SSL_get_peer_cert_chain(s);
                if (sk != NULL)
                        {
                        got_a_chain = 1; /* we don't have it for SSL2 (yet) */

                        BIO_printf(bio,"---\nCertificate chain\n");
                        for (i=0; i<sk_X509_num(sk); i++)
                                {
                                X509_NAME_oneline(X509_get_subject_name(
                                        sk_X509_value(sk,i)),buf,sizeof buf);
                                BIO_printf(bio,"%2d s:%s\n",i,buf);
                                X509_NAME_oneline(X509_get_issuer_name(
                                        sk_X509_value(sk,i)),buf,sizeof buf);
                                BIO_printf(bio,"   i:%s\n",buf);
                                if (c_showcerts)
                                        PEM_write_bio_X509(bio,sk_X509_value(sk,i));
                                }
                        }

                BIO_printf(bio,"---\n");
                peer=SSL_get_peer_certificate(s);
                if (peer != NULL)
                        {
                        BIO_printf(bio,"Server certificate\n");
                        if (!(c_showcerts && got_a_chain)) /* Redundant if we showed the whole chain */
                                PEM_write_bio_X509(bio,peer);
                        X509_NAME_oneline(X509_get_subject_name(peer),
                                buf,sizeof buf);
                        BIO_printf(bio,"subject=%s\n",buf);
                        X509_NAME_oneline(X509_get_issuer_name(peer),
                                buf,sizeof buf);
                        BIO_printf(bio,"issuer=%s\n",buf);
                        }
                else
                        BIO_printf(bio,"no peer certificate available\n");

                sk2=SSL_get_client_CA_list(s);
                if ((sk2 != NULL) && (sk_X509_NAME_num(sk2) > 0))
                        {
                        BIO_printf(bio,"---\nAcceptable client certificate CA names\n");
                        for (i=0; i<sk_X509_NAME_num(sk2); i++)
                                {
                                xn=sk_X509_NAME_value(sk2,i);
                                X509_NAME_oneline(xn,buf,sizeof(buf));
                                BIO_write(bio,buf,strlen(buf));
                                BIO_write(bio,"\n",1);
                                }
                        }
                else
                        {
                        BIO_printf(bio,"---\nNo client certificate CA names sent\n");
                        }
                p=SSL_get_shared_ciphers(s,buf,sizeof buf);
                if (p != NULL)
                        {
                        /* This works only for SSL 2.  In later protocol
                         * versions, the client does not know what other
                         * ciphers (in addition to the one to be used
                         * in the current connection) the server supports. */

                        BIO_printf(bio,"---\nCiphers common between both SSL endpoints:\n");
                        j=i=0;
                        while (*p)
                                {
                                if (*p == ':')
                                        {
                                        BIO_write(bio,space,15-j%25);
                                        i++;
                                        j=0;
                                        BIO_write(bio,((i%3)?" ":"\n"),1);
                                        }
                                else
                                        {
                                        BIO_write(bio,p,1);
                                        j++;
                                        }
                                p++;
                                }
                        BIO_write(bio,"\n",1);
                        }

                BIO_printf(bio,"---\nSSL handshake has read %ld bytes and written %ld bytes\n",
                        BIO_number_read(SSL_get_rbio(s)),
                        BIO_number_written(SSL_get_wbio(s)));
                }
        BIO_printf(bio,((s->hit)?"---\nReused, ":"---\nNew, "));
        c=SSL_get_current_cipher(s);
        BIO_printf(bio,"%s, Cipher is %s\n",
                SSL_CIPHER_get_version(c),
                SSL_CIPHER_get_name(c));
        if (peer != NULL) {
                EVP_PKEY *pktmp;
                pktmp = X509_get_pubkey(peer);
                BIO_printf(bio,"Server public key is %d bit\n",
                                                         EVP_PKEY_bits(pktmp));
                EVP_PKEY_free(pktmp);
        }
        SSL_SESSION_print(bio,SSL_get_session(s));
        BIO_printf(bio,"---\n");
        if (peer != NULL)
                X509_free(peer);
        /* flush, or debugging output gets mixed with http response */
        BIO_flush(bio);
        }