/* crypto/bio/bss_acpt.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 <stdio.h>#include <errno.h>#define USE_SOCKETS#include "cryptlib.h"#include <openssl/bio.h>#ifndef OPENSSL_NO_SOCK#ifdef OPENSSL_SYS_WIN16#define SOCKET_PROTOCOL 0 /* more microsoft stupidity */#else#define SOCKET_PROTOCOL IPPROTO_TCP#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#endiftypedef struct bio_accept_st	{	int state;	char *param_addr;	int accept_sock;	int accept_nbio;	char *addr;	int nbio;	/* If 0, it means normal, if 1, do a connect on bind failure,	 * and if there is no-one listening, bind with SO_REUSEADDR.	 * If 2, always use SO_REUSEADDR. */	int bind_mode;	BIO *bio_chain;	} BIO_ACCEPT;static int acpt_write(BIO *h, const char *buf, int num);static int acpt_read(BIO *h, char *buf, int size);static int acpt_puts(BIO *h, const char *str);static long acpt_ctrl(BIO *h, int cmd, long arg1, void *arg2);static int acpt_new(BIO *h);static int acpt_free(BIO *data);static int acpt_state(BIO *b, BIO_ACCEPT *c);static void acpt_close_socket(BIO *data);BIO_ACCEPT *BIO_ACCEPT_new(void );void BIO_ACCEPT_free(BIO_ACCEPT *a);#define ACPT_S_BEFORE			1#define ACPT_S_GET_ACCEPT_SOCKET	2#define ACPT_S_OK			3static BIO_METHOD methods_acceptp=	{	BIO_TYPE_ACCEPT,	"socket accept",	acpt_write,	acpt_read,	acpt_puts,	NULL, /* connect_gets, */	acpt_ctrl,	acpt_new,	acpt_free,	NULL,	};BIO_METHOD *BIO_s_accept(void)	{	return(&methods_acceptp);	}static int acpt_new(BIO *bi)	{	BIO_ACCEPT *ba;	bi->init=0;	bi->num=INVALID_SOCKET;	bi->flags=0;	if ((ba=BIO_ACCEPT_new()) == NULL)		return(0);	bi->ptr=(char *)ba;	ba->state=ACPT_S_BEFORE;	bi->shutdown=1;	return(1);	}BIO_ACCEPT *BIO_ACCEPT_new(void)	{	BIO_ACCEPT *ret;	if ((ret=(BIO_ACCEPT *)OPENSSL_malloc(sizeof(BIO_ACCEPT))) == NULL)		return(NULL);	memset(ret,0,sizeof(BIO_ACCEPT));	ret->accept_sock=INVALID_SOCKET;	ret->bind_mode=BIO_BIND_NORMAL;	return(ret);	}void BIO_ACCEPT_free(BIO_ACCEPT *a)	{	if(a == NULL)	    return;	if (a->param_addr != NULL) OPENSSL_free(a->param_addr);	if (a->addr != NULL) OPENSSL_free(a->addr);	if (a->bio_chain != NULL) BIO_free(a->bio_chain);	OPENSSL_free(a);	}static void acpt_close_socket(BIO *bio)	{	BIO_ACCEPT *c;	c=(BIO_ACCEPT *)bio->ptr;	if (c->accept_sock != INVALID_SOCKET)		{		shutdown(c->accept_sock,2);		closesocket(c->accept_sock);		c->accept_sock=INVALID_SOCKET;		bio->num=INVALID_SOCKET;		}	}static int acpt_free(BIO *a)	{	BIO_ACCEPT *data;	if (a == NULL) return(0);	data=(BIO_ACCEPT *)a->ptr;	 	if (a->shutdown)		{		acpt_close_socket(a);		BIO_ACCEPT_free(data);		a->ptr=NULL;		a->flags=0;		a->init=0;		}	return(1);	}	static int acpt_state(BIO *b, BIO_ACCEPT *c)	{	BIO *bio=NULL,*dbio;	int s= -1;	int i;again:	switch (c->state)		{	case ACPT_S_BEFORE:		if (c->param_addr == NULL)			{			BIOerr(BIO_F_ACPT_STATE,BIO_R_NO_ACCEPT_PORT_SPECIFIED);			return(-1);			}		s=BIO_get_accept_socket(c->param_addr,c->bind_mode);		if (s == INVALID_SOCKET)			return(-1);		if (c->accept_nbio)			{			if (!BIO_socket_nbio(s,1))				{				closesocket(s);				BIOerr(BIO_F_ACPT_STATE,BIO_R_ERROR_SETTING_NBIO_ON_ACCEPT_SOCKET);				return(-1);				}			}		c->accept_sock=s;		b->num=s;		c->state=ACPT_S_GET_ACCEPT_SOCKET;		return(1);		/* break; */	case ACPT_S_GET_ACCEPT_SOCKET:		if (b->next_bio != NULL)			{			c->state=ACPT_S_OK;			goto again;			}		BIO_clear_retry_flags(b);		b->retry_reason=0;		i=BIO_accept(c->accept_sock,&(c->addr));		/* -2 return means we should retry */		if(i == -2)			{			BIO_set_retry_special(b);			b->retry_reason=BIO_RR_ACCEPT;			return -1;			}		if (i < 0) return(i);		bio=BIO_new_socket(i,BIO_CLOSE);		if (bio == NULL) goto err;		BIO_set_callback(bio,BIO_get_callback(b));		BIO_set_callback_arg(bio,BIO_get_callback_arg(b));		if (c->nbio)			{			if (!BIO_socket_nbio(i,1))				{				BIOerr(BIO_F_ACPT_STATE,BIO_R_ERROR_SETTING_NBIO_ON_ACCEPTED_SOCKET);				goto err;				}			}		/* If the accept BIO has an bio_chain, we dup it and		 * put the new socket at the end. */		if (c->bio_chain != NULL)			{			if ((dbio=BIO_dup_chain(c->bio_chain)) == NULL)				goto err;			if (!BIO_push(dbio,bio)) goto err;			bio=dbio;			}		if (BIO_push(b,bio) == NULL) goto err;		c->state=ACPT_S_OK;		return(1);err:		if (bio != NULL)			BIO_free(bio);		else if (s >= 0)			closesocket(s);		return(0);		/* break; */	case ACPT_S_OK:		if (b->next_bio == NULL)			{			c->state=ACPT_S_GET_ACCEPT_SOCKET;			goto again;			}		return(1);		/* break; */	default:			return(0);		/* break; */		}	}static int acpt_read(BIO *b, char *out, int outl)	{	int ret=0;	BIO_ACCEPT *data;	BIO_clear_retry_flags(b);	data=(BIO_ACCEPT *)b->ptr;	while (b->next_bio == NULL)		{		ret=acpt_state(b,data);		if (ret <= 0) return(ret);		}	ret=BIO_read(b->next_bio,out,outl);	BIO_copy_next_retry(b);	return(ret);	}static int acpt_write(BIO *b, const char *in, int inl)	{	int ret;	BIO_ACCEPT *data;	BIO_clear_retry_flags(b);	data=(BIO_ACCEPT *)b->ptr;	while (b->next_bio == NULL)		{		ret=acpt_state(b,data);		if (ret <= 0) return(ret);		}	ret=BIO_write(b->next_bio,in,inl);	BIO_copy_next_retry(b);	return(ret);	}static long acpt_ctrl(BIO *b, int cmd, long num, void *ptr)	{	BIO *dbio;	int *ip;	long ret=1;	BIO_ACCEPT *data;	char **pp;	data=(BIO_ACCEPT *)b->ptr;	switch (cmd)		{	case BIO_CTRL_RESET:		ret=0;		data->state=ACPT_S_BEFORE;		acpt_close_socket(b);		b->flags=0;		break;	case BIO_C_DO_STATE_MACHINE:		/* use this one to start the connection */		ret=(long)acpt_state(b,data);		break;	case BIO_C_SET_ACCEPT:		if (ptr != NULL)			{			if (num == 0)				{				b->init=1;				if (data->param_addr != NULL)					OPENSSL_free(data->param_addr);				data->param_addr=BUF_strdup(ptr);				}			else if (num == 1)				{				data->accept_nbio=(ptr != NULL);				}			else if (num == 2)				{				if (data->bio_chain != NULL)					BIO_free(data->bio_chain);				data->bio_chain=(BIO *)ptr;				}			}		break;	case BIO_C_SET_NBIO:		data->nbio=(int)num;		break;	case BIO_C_SET_FD:		b->init=1;		b->num= *((int *)ptr);		data->accept_sock=b->num;		data->state=ACPT_S_GET_ACCEPT_SOCKET;		b->shutdown=(int)num;		b->init=1;		break;	case BIO_C_GET_FD:		if (b->init)			{			ip=(int *)ptr;			if (ip != NULL)				*ip=data->accept_sock;			ret=data->accept_sock;			}		else			ret= -1;		break;	case BIO_C_GET_ACCEPT:		if (b->init)			{			if (ptr != NULL)				{				pp=(char **)ptr;				*pp=data->param_addr;				}			else				ret= -1;			}		else			ret= -1;		break;	case BIO_CTRL_GET_CLOSE:		ret=b->shutdown;		break;	case BIO_CTRL_SET_CLOSE:		b->shutdown=(int)num;		break;	case BIO_CTRL_PENDING:	case BIO_CTRL_WPENDING:		ret=0;		break;	case BIO_CTRL_FLUSH:		break;	case BIO_C_SET_BIND_MODE:		data->bind_mode=(int)num;		break;	case BIO_C_GET_BIND_MODE:		ret=(long)data->bind_mode;		break;	case BIO_CTRL_DUP:		dbio=(BIO *)ptr;/*		if (data->param_port) EAY EAY			BIO_set_port(dbio,data->param_port);		if (data->param_hostname)			BIO_set_hostname(dbio,data->param_hostname);		BIO_set_nbio(dbio,data->nbio); */		break;	default:		ret=0;		break;		}	return(ret);	}static int acpt_puts(BIO *bp, const char *str)	{	int n,ret;	n=strlen(str);	ret=acpt_write(bp,str,n);	return(ret);	}BIO *BIO_new_accept(char *str)	{	BIO *ret;	ret=BIO_new(BIO_s_accept());	if (ret == NULL) return(NULL);	if (BIO_set_accept_port(ret,str))		return(ret);	else		{		BIO_free(ret);		return(NULL);		}	}#endif