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) 1998-2006 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).
 *
 */
/* ====================================================================
 * Copyright 2005 Nokia. All rights reserved.
 *
 * The portions of the attached software ("Contribution") is developed by
 * Nokia Corporation and is licensed pursuant to the OpenSSL open source
 * license.
 *
 * The Contribution, originally written by Mika Kousa and Pasi Eronen of
 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
 * support (see RFC 4279) to OpenSSL.
 *
 * No patent licenses or other rights except those expressly stated in
 * the OpenSSL open source license shall be deemed granted or received
 * expressly, by implication, estoppel, or otherwise.
 *
 * No assurances are provided by Nokia that the Contribution does not
 * infringe the patent or other intellectual property rights of any third
 * party or that the license provides you with all the necessary rights
 * to make use of the Contribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
 * OTHERWISE.
 */

#include <assert.h>
#include <ctype.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 <openssl/ocsp.h>
#include <openssl/bn.h>
#ifndef OPENSSL_NO_SRP
#include <openssl/srp.h>
#endif
#include "s_apps.h"
#include "timeouts.h"

#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

#if defined(OPENSSL_SYS_BEOS_R5)
#include <fcntl.h>
#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;
extern int verify_return_error;

#ifdef FIONBIO
static int c_nbio=0;
#endif
static int c_Pause=0;
static int c_debug=0;
#ifndef OPENSSL_NO_TLSEXT
static int c_tlsextdebug=0;
static int c_status_req=0;
static int c_proof_debug=0;
#endif
static int c_msg=0;
static int c_showcerts=0;

static char *keymatexportlabel=NULL;
static int keymatexportlen=20;

static void sc_usage(void);
static void print_stuff(BIO *berr,SSL *con,int full);
#ifndef OPENSSL_NO_TLSEXT
static int ocsp_resp_cb(SSL *s, void *arg);
static int audit_proof_cb(SSL *s, void *arg);
#endif
static BIO *bio_c_out=NULL;
static int c_quiet=0;
static int c_ign_eof=0;

#ifndef OPENSSL_NO_PSK
/* Default PSK identity and key */
static char *psk_identity="Client_identity";
/*char *psk_key=NULL;  by default PSK is not used */

static unsigned int psk_client_cb(SSL *ssl, const char *hint, char *identity,
	unsigned int max_identity_len, unsigned char *psk,
	unsigned int max_psk_len)
	{
	unsigned int psk_len = 0;
	int ret;
        BIGNUM *bn=NULL;

	if (c_debug)
		BIO_printf(bio_c_out, "psk_client_cb\n");
	if (!hint)
                {
                /* no ServerKeyExchange message*/
		if (c_debug)
			BIO_printf(bio_c_out,"NULL received PSK identity hint, continuing anyway\n");
                }
        else if (c_debug)
		BIO_printf(bio_c_out, "Received PSK identity hint '%s'\n", hint);

	/* lookup PSK identity and PSK key based on the given identity hint here */
	ret = BIO_snprintf(identity, max_identity_len, "%s", psk_identity);
	if (ret < 0 || (unsigned int)ret > max_identity_len)
		goto out_err;
	if (c_debug)
		BIO_printf(bio_c_out, "created identity '%s' len=%d\n", identity, ret);
        ret=BN_hex2bn(&bn, psk_key);
        if (!ret)
                {
                BIO_printf(bio_err,"Could not convert PSK key '%s' to BIGNUM\n", psk_key);
                if (bn)
                        BN_free(bn);
                return 0;
                }

        if ((unsigned int)BN_num_bytes(bn) > max_psk_len)
                {
                BIO_printf(bio_err,"psk buffer of callback is too small (%d) for key (%d)\n",
                        max_psk_len, BN_num_bytes(bn));
                BN_free(bn);
                return 0;
                }

        psk_len=BN_bn2bin(bn, psk);
        BN_free(bn);
        if (psk_len == 0)
                goto out_err;

	if (c_debug)
		BIO_printf(bio_c_out, "created PSK len=%d\n", psk_len);

        return psk_len;
 out_err:
	if (c_debug)
		BIO_printf(bio_err, "Error in PSK client callback\n");
        return 0;
	}
#endif

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," -certform arg - certificate format (PEM or DER) PEM default\n");
	BIO_printf(bio_err," -key arg      - Private key file to use, in cert file if\n");
	BIO_printf(bio_err,"                 not specified but cert file is.\n");
	BIO_printf(bio_err," -keyform arg  - key format (PEM or DER) PEM default\n");
	BIO_printf(bio_err," -pass arg     - private key file pass phrase source\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");
#ifdef WATT32
	BIO_printf(bio_err," -wdebug       - WATT-32 tcp debugging\n");
#endif
	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," -no_ign_eof   - don't ignore input eof\n");
#ifndef OPENSSL_NO_PSK
	BIO_printf(bio_err," -psk_identity arg - PSK identity\n");
	BIO_printf(bio_err," -psk arg      - PSK in hex (without 0x)\n");
# ifndef OPENSSL_NO_JPAKE
	BIO_printf(bio_err," -jpake arg    - JPAKE secret to use\n");
# endif
#endif
#ifndef OPENSSL_NO_SRP
	BIO_printf(bio_err," -srpuser user     - SRP authentification for 'user'\n");
	BIO_printf(bio_err," -srppass arg      - password for 'user'\n");
	BIO_printf(bio_err," -srp_lateuser     - SRP username into second ClientHello message\n");
	BIO_printf(bio_err," -srp_moregroups   - Tolerate other than the known g N values.\n");
	BIO_printf(bio_err," -srp_strength int - minimal mength in bits for N (default %d).\n",SRP_MINIMAL_N);
#endif
	BIO_printf(bio_err," -ssl2         - just use SSLv2\n");
	BIO_printf(bio_err," -ssl3         - just use SSLv3\n");
	BIO_printf(bio_err," -tls1_2       - just use TLSv1.2\n");
	BIO_printf(bio_err," -tls1_1       - just use TLSv1.1\n");
	BIO_printf(bio_err," -tls1         - just use TLSv1\n");
	BIO_printf(bio_err," -dtls1        - just use DTLSv1\n");    
	BIO_printf(bio_err," -mtu          - set the link layer MTU\n");
	BIO_printf(bio_err," -no_tls1_2/-no_tls1_1/-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\", \"pop3\", \"imap\", \"ftp\" and \"xmpp\"\n");
	BIO_printf(bio_err,"                 are supported.\n");
#ifndef OPENSSL_NO_ENGINE
	BIO_printf(bio_err," -engine id    - Initialise and use the specified engine\n");
#endif
	BIO_printf(bio_err," -rand file%cfile%c...\n", LIST_SEPARATOR_CHAR, LIST_SEPARATOR_CHAR);
	BIO_printf(bio_err," -sess_out arg - file to write SSL session to\n");
	BIO_printf(bio_err," -sess_in arg  - file to read SSL session from\n");
#ifndef OPENSSL_NO_TLSEXT
	BIO_printf(bio_err," -servername host  - Set TLS extension servername in ClientHello\n");
	BIO_printf(bio_err," -tlsextdebug      - hex dump of all TLS extensions received\n");
	BIO_printf(bio_err," -status           - request certificate status from server\n");
	BIO_printf(bio_err," -no_ticket        - disable use of RFC4507bis session tickets\n");
	BIO_printf(bio_err," -proof_debug      - request an audit proof and print its hex dump\n");
# ifndef OPENSSL_NO_NEXTPROTONEG
	BIO_printf(bio_err," -nextprotoneg arg - enable NPN extension, considering named protocols supported (comma-separated list)\n");
# endif
#endif
	BIO_printf(bio_err," -legacy_renegotiation - enable use of legacy renegotiation (dangerous)\n");
	BIO_printf(bio_err," -use_srtp profiles - Offer SRTP key management with a colon-separated profile list\n");
 	BIO_printf(bio_err," -keymatexport label   - Export keying material using label\n");
 	BIO_printf(bio_err," -keymatexportlen len  - Export len bytes of keying material (default 20)\n");
	}

#ifndef OPENSSL_NO_TLSEXT

/* This is a context that we pass to callbacks */
typedef struct tlsextctx_st {
   BIO * biodebug;
   int ack;
} tlsextctx;


static int MS_CALLBACK ssl_servername_cb(SSL *s, int *ad, void *arg)
	{
	tlsextctx * p = (tlsextctx *) arg;
	const char * hn= SSL_get_servername(s, TLSEXT_NAMETYPE_host_name);
	if (SSL_get_servername_type(s) != -1) 
 	        p->ack = !SSL_session_reused(s) && hn != NULL;
	else 
		BIO_printf(bio_err,"Can't use SSL_get_servername\n");
	
	return SSL_TLSEXT_ERR_OK;
	}

#ifndef OPENSSL_NO_SRP

/* This is a context that we pass to all callbacks */
typedef struct srp_arg_st
	{
	char *srppassin;
	char *srplogin;
	int msg;   /* copy from c_msg */
	int debug; /* copy from c_debug */
	int amp;   /* allow more groups */
	int strength /* minimal size for N */ ;
	} SRP_ARG;

#define SRP_NUMBER_ITERATIONS_FOR_PRIME 64

static int srp_Verify_N_and_g(const BIGNUM *N, const BIGNUM *g)
	{
	BN_CTX *bn_ctx = BN_CTX_new();
	BIGNUM *p = BN_new();
	BIGNUM *r = BN_new();
	int ret =
		g != NULL && N != NULL && bn_ctx != NULL && BN_is_odd(N) &&
		BN_is_prime_ex(N, SRP_NUMBER_ITERATIONS_FOR_PRIME, bn_ctx, NULL) &&
		p != NULL && BN_rshift1(p, N) &&

		/* p = (N-1)/2 */
		BN_is_prime_ex(p, SRP_NUMBER_ITERATIONS_FOR_PRIME, bn_ctx, NULL) &&
		r != NULL &&

		/* verify g^((N-1)/2) == -1 (mod N) */
		BN_mod_exp(r, g, p, N, bn_ctx) &&
		BN_add_word(r, 1) &&
		BN_cmp(r, N) == 0;

	if(r)
		BN_free(r);
	if(p)
		BN_free(p);
	if(bn_ctx)
		BN_CTX_free(bn_ctx);
	return ret;
	}

/* This callback is used here for two purposes:
   - extended debugging
   - making some primality tests for unknown groups
   The callback is only called for a non default group.

   An application does not need the call back at all if
   only the stanard groups are used.  In real life situations, 
   client and server already share well known groups, 
   thus there is no need to verify them. 
   Furthermore, in case that a server actually proposes a group that
   is not one of those defined in RFC 5054, it is more appropriate 
   to add the group to a static list and then compare since 
   primality tests are rather cpu consuming.
*/

static int MS_CALLBACK ssl_srp_verify_param_cb(SSL *s, void *arg)
	{
	SRP_ARG *srp_arg = (SRP_ARG *)arg;
	BIGNUM *N = NULL, *g = NULL;
	if (!(N = SSL_get_srp_N(s)) || !(g = SSL_get_srp_g(s)))
		return 0;
	if (srp_arg->debug || srp_arg->msg || srp_arg->amp == 1)
		{
    		BIO_printf(bio_err, "SRP parameters:\n"); 
		BIO_printf(bio_err,"\tN="); BN_print(bio_err,N);
		BIO_printf(bio_err,"\n\tg="); BN_print(bio_err,g);
		BIO_printf(bio_err,"\n");
		}

	if (SRP_check_known_gN_param(g,N))
		return 1;

	if (srp_arg->amp == 1)
		{
		if (srp_arg->debug)
			BIO_printf(bio_err, "SRP param N and g are not known params, going to check deeper.\n");

/* The srp_moregroups is a real debugging feature.
   Implementors should rather add the value to the known ones.
   The minimal size has already been tested.
*/
		if (BN_num_bits(g) <= BN_BITS && srp_Verify_N_and_g(N,g))
			return 1;
		}	
	BIO_printf(bio_err, "SRP param N and g rejected.\n");
	return 0;
	}

#define PWD_STRLEN 1024

static char * MS_CALLBACK ssl_give_srp_client_pwd_cb(SSL *s, void *arg)
	{
	SRP_ARG *srp_arg = (SRP_ARG *)arg;
	char *pass = (char *)OPENSSL_malloc(PWD_STRLEN+1);
	PW_CB_DATA cb_tmp;
	int l;

	cb_tmp.password = (char *)srp_arg->srppassin;
	cb_tmp.prompt_info = "SRP user";
	if ((l = password_callback(pass, PWD_STRLEN, 0, &cb_tmp))<0)
		{
		BIO_printf (bio_err, "Can't read Password\n");
		OPENSSL_free(pass);
		return NULL;
		}
	*(pass+l)= '\0';

	return pass;
	}

#endif
	char *srtp_profiles = NULL;

# ifndef OPENSSL_NO_NEXTPROTONEG
/* This the context that we pass to next_proto_cb */
typedef struct tlsextnextprotoctx_st {
	unsigned char *data;
	unsigned short len;
	int status;
} tlsextnextprotoctx;

static tlsextnextprotoctx next_proto;

static int next_proto_cb(SSL *s, unsigned char **out, unsigned char *outlen, const unsigned char *in, unsigned int inlen, void *arg)
	{
	tlsextnextprotoctx *ctx = arg;

	if (!c_quiet)
		{
		/* We can assume that |in| is syntactically valid. */
		unsigned i;
		BIO_printf(bio_c_out, "Protocols advertised by server: ");
		for (i = 0; i < inlen; )
			{
			if (i)
				BIO_write(bio_c_out, ", ", 2);
			BIO_write(bio_c_out, &in[i + 1], in[i]);
			i += in[i] + 1;
			}
		BIO_write(bio_c_out, "\n", 1);
		}

	ctx->status = SSL_select_next_proto(out, outlen, in, inlen, ctx->data, ctx->len);
	return SSL_TLSEXT_ERR_OK;
	}
# endif  /* ndef OPENSSL_NO_NEXTPROTONEG */
#endif

enum
{
	PROTO_OFF	= 0,
	PROTO_SMTP,
	PROTO_POP3,
	PROTO_IMAP,
	PROTO_FTP,
	PROTO_XMPP
};

int MAIN(int, char **);

int MAIN(int argc, char **argv)
	{
	unsigned int off=0, clr=0;
	SSL *con=NULL;
#ifndef OPENSSL_NO_KRB5
	KSSL_CTX *kctx;
#endif
	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;
	int cert_format = FORMAT_PEM, key_format = FORMAT_PEM;
	char *passarg = NULL, *pass = NULL;
	X509 *cert = NULL;
	EVP_PKEY *key = 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 starttls_proto = PROTO_OFF;
	int prexit = 0;
	X509_VERIFY_PARAM *vpm = NULL;
	int badarg = 0;
	const SSL_METHOD *meth=NULL;
	int socket_type=SOCK_STREAM;
	BIO *sbio;
	char *inrand=NULL;
	int mbuf_len=0;
	struct timeval timeout, *timeoutp;
#ifndef OPENSSL_NO_ENGINE
	char *engine_id=NULL;
	char *ssl_client_engine_id=NULL;
	ENGINE *ssl_client_engine=NULL;
#endif
	ENGINE *e=NULL;
#if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_MSDOS) || defined(OPENSSL_SYS_NETWARE) || defined(OPENSSL_SYS_BEOS_R5)
	struct timeval tv;
#if defined(OPENSSL_SYS_BEOS_R5)
	int stdin_set = 0;
#endif
#endif
#ifndef OPENSSL_NO_TLSEXT
	char *servername = NULL; 
	char *curves=NULL;
        tlsextctx tlsextcbp = 
        {NULL,0};
# ifndef OPENSSL_NO_NEXTPROTONEG
	const char *next_proto_neg_in = NULL;
# endif
#endif
	char *sess_in = NULL;
	char *sess_out = NULL;
	struct sockaddr peer;
	int peerlen = sizeof(peer);
	int enable_timeouts = 0 ;
	long socket_mtu = 0;
#ifndef OPENSSL_NO_JPAKE
	char *jpake_secret = NULL;
#endif
#ifndef OPENSSL_NO_SRP
	char * srppass = NULL;
	int srp_lateuser = 0;
	SRP_ARG srp_arg = {NULL,NULL,0,0,0,1024};
#endif

	meth=SSLv23_client_method();

	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,"-sess_out") == 0)
			{
			if (--argc < 1) goto bad;
			sess_out = *(++argv);
			}
		else if	(strcmp(*argv,"-sess_in") == 0)
			{
			if (--argc < 1) goto bad;
			sess_in = *(++argv);
			}
		else if	(strcmp(*argv,"-certform") == 0)
			{
			if (--argc < 1) goto bad;
			cert_format = str2fmt(*(++argv));
			}
		else if (args_verify(&argv, &argc, &badarg, bio_err, &vpm))
			{
			if (badarg)
				goto bad;
			continue;
			}
		else if (strcmp(*argv,"-verify_return_error") == 0)
			verify_return_error = 1;
		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,"-no_ign_eof") == 0)
			c_ign_eof=0;
		else if	(strcmp(*argv,"-pause") == 0)
			c_Pause=1;
		else if	(strcmp(*argv,"-debug") == 0)
			c_debug=1;
#ifndef OPENSSL_NO_TLSEXT
		else if	(strcmp(*argv,"-tlsextdebug") == 0)
			c_tlsextdebug=1;
		else if	(strcmp(*argv,"-status") == 0)
			c_status_req=1;
		else if	(strcmp(*argv,"-proof_debug") == 0)
			c_proof_debug=1;
#endif
#ifdef WATT32
		else if (strcmp(*argv,"-wdebug") == 0)
			dbug_init();
#endif
		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_PSK
                else if (strcmp(*argv,"-psk_identity") == 0)
			{
			if (--argc < 1) goto bad;
			psk_identity=*(++argv);
			}
                else if (strcmp(*argv,"-psk") == 0)
			{
                        size_t j;

			if (--argc < 1) goto bad;
			psk_key=*(++argv);
			for (j = 0; j < strlen(psk_key); j++)
                                {
                                if (isxdigit((unsigned char)psk_key[j]))
                                        continue;
                                BIO_printf(bio_err,"Not a hex number '%s'\n",*argv);
                                goto bad;
                                }
			}
#endif
#ifndef OPENSSL_NO_SRP
		else if (strcmp(*argv,"-srpuser") == 0)
			{
			if (--argc < 1) goto bad;
			srp_arg.srplogin= *(++argv);
			meth=TLSv1_client_method();
			}
		else if (strcmp(*argv,"-srppass") == 0)
			{
			if (--argc < 1) goto bad;
			srppass= *(++argv);
			meth=TLSv1_client_method();
			}
		else if (strcmp(*argv,"-srp_strength") == 0)
			{
			if (--argc < 1) goto bad;
			srp_arg.strength=atoi(*(++argv));
			BIO_printf(bio_err,"SRP minimal length for N is %d\n",srp_arg.strength);
			meth=TLSv1_client_method();
			}
		else if (strcmp(*argv,"-srp_lateuser") == 0)
			{
			srp_lateuser= 1;
			meth=TLSv1_client_method();
			}
		else if	(strcmp(*argv,"-srp_moregroups") == 0)
			{
			srp_arg.amp=1;
			meth=TLSv1_client_method();
			}
#endif
#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_2") == 0)
			meth=TLSv1_2_client_method();
		else if	(strcmp(*argv,"-tls1_1") == 0)
			meth=TLSv1_1_client_method();
		else if	(strcmp(*argv,"-tls1") == 0)
			meth=TLSv1_client_method();
#endif
#ifndef OPENSSL_NO_DTLS1
		else if	(strcmp(*argv,"-dtls1") == 0)
			{
			meth=DTLSv1_client_method();
			socket_type=SOCK_DGRAM;
			}
		else if (strcmp(*argv,"-timeout") == 0)
			enable_timeouts=1;
		else if (strcmp(*argv,"-mtu") == 0)
			{
			if (--argc < 1) goto bad;
			socket_mtu = atol(*(++argv));
			}
#endif
		else if (strcmp(*argv,"-bugs") == 0)
			bugs=1;
		else if	(strcmp(*argv,"-keyform") == 0)
			{
			if (--argc < 1) goto bad;
			key_format = str2fmt(*(++argv));
			}
		else if	(strcmp(*argv,"-pass") == 0)
			{
			if (--argc < 1) goto bad;
			passarg = *(++argv);
			}
		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_2") == 0)
			off|=SSL_OP_NO_TLSv1_2;
		else if (strcmp(*argv,"-no_tls1_1") == 0)
			off|=SSL_OP_NO_TLSv1_1;
		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,"-no_comp") == 0)
			{ off|=SSL_OP_NO_COMPRESSION; }
#ifndef OPENSSL_NO_TLSEXT
		else if	(strcmp(*argv,"-no_ticket") == 0)
			{ off|=SSL_OP_NO_TICKET; }
# ifndef OPENSSL_NO_NEXTPROTONEG
		else if (strcmp(*argv,"-nextprotoneg") == 0)
			{
			if (--argc < 1) goto bad;
			next_proto_neg_in = *(++argv);
			}
# endif
#endif
		else if (strcmp(*argv,"-serverpref") == 0)
			off|=SSL_OP_CIPHER_SERVER_PREFERENCE;
		else if (strcmp(*argv,"-legacy_renegotiation") == 0)
			off|=SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION;
		else if	(strcmp(*argv,"-legacy_server_connect") == 0)
			{ off|=SSL_OP_LEGACY_SERVER_CONNECT; }
		else if	(strcmp(*argv,"-no_legacy_server_connect") == 0)
			{ clr|=SSL_OP_LEGACY_SERVER_CONNECT; }
		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)
				starttls_proto = PROTO_SMTP;
			else if (strcmp(*argv,"pop3") == 0)
				starttls_proto = PROTO_POP3;
			else if (strcmp(*argv,"imap") == 0)
				starttls_proto = PROTO_IMAP;
			else if (strcmp(*argv,"ftp") == 0)
				starttls_proto = PROTO_FTP;
			else if (strcmp(*argv, "xmpp") == 0)
				starttls_proto = PROTO_XMPP;
			else
				goto bad;
			}
#ifndef OPENSSL_NO_ENGINE
		else if	(strcmp(*argv,"-engine") == 0)
			{
			if (--argc < 1) goto bad;
			engine_id = *(++argv);
			}
		else if	(strcmp(*argv,"-ssl_client_engine") == 0)
			{
			if (--argc < 1) goto bad;
			ssl_client_engine_id = *(++argv);
			}
#endif
		else if (strcmp(*argv,"-rand") == 0)
			{
			if (--argc < 1) goto bad;
			inrand= *(++argv);
			}
#ifndef OPENSSL_NO_TLSEXT
		else if (strcmp(*argv,"-servername") == 0)
			{
			if (--argc < 1) goto bad;
			servername= *(++argv);
			/* meth=TLSv1_client_method(); */
			}
		else if	(strcmp(*argv,"-curves") == 0)
			{
			if (--argc < 1) goto bad;
			curves= *(++argv);
			}
#endif
#ifndef OPENSSL_NO_JPAKE
		else if (strcmp(*argv,"-jpake") == 0)
			{
			if (--argc < 1) goto bad;
			jpake_secret = *++argv;
			}
#endif
		else if (strcmp(*argv,"-use_srtp") == 0)
			{
			if (--argc < 1) goto bad;
			srtp_profiles = *(++argv);
			}
		else if (strcmp(*argv,"-keymatexport") == 0)
			{
			if (--argc < 1) goto bad;
			keymatexportlabel= *(++argv);
			}
		else if (strcmp(*argv,"-keymatexportlen") == 0)
			{
			if (--argc < 1) goto bad;
			keymatexportlen=atoi(*(++argv));
			if (keymatexportlen == 0) goto bad;
			}
                else
			{
			BIO_printf(bio_err,"unknown option %s\n",*argv);
			badop=1;
			break;
			}
		argc--;
		argv++;
		}
	if (badop)
		{
bad:
		sc_usage();
		goto end;
		}

#if !defined(OPENSSL_NO_JPAKE) && !defined(OPENSSL_NO_PSK)
	if (jpake_secret)
		{
		if (psk_key)
			{
			BIO_printf(bio_err,
				   "Can't use JPAKE and PSK together\n");
			goto end;
			}
		psk_identity = "JPAKE";