/* 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
#endif

typedef 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			3

static 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