/* crypto/bio/bio.h */
/* 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.]
 */

#ifndef HEADER_BIO_H
#define HEADER_BIO_H

#include <openssl/e_os2.h>

#ifndef OPENSSL_NO_FP_API
# include <stdio.h>
#endif
#include <stdarg.h>

#include <openssl/crypto.h>

#ifdef  __cplusplus
extern "C" {
#endif

/* These are the 'types' of BIOs */
#define BIO_TYPE_NONE		0
#define BIO_TYPE_MEM		(1|0x0400)
#define BIO_TYPE_FILE		(2|0x0400)

#define BIO_TYPE_FD		(4|0x0400|0x0100)
#define BIO_TYPE_SOCKET		(5|0x0400|0x0100)
#define BIO_TYPE_NULL		(6|0x0400)
#define BIO_TYPE_SSL		(7|0x0200)
#define BIO_TYPE_MD		(8|0x0200)		/* passive filter */
#define BIO_TYPE_BUFFER		(9|0x0200)		/* filter */
#define BIO_TYPE_CIPHER		(10|0x0200)		/* filter */
#define BIO_TYPE_BASE64		(11|0x0200)		/* filter */
#define BIO_TYPE_CONNECT	(12|0x0400|0x0100)	/* socket - connect */
#define BIO_TYPE_ACCEPT		(13|0x0400|0x0100)	/* socket for accept */
#define BIO_TYPE_PROXY_CLIENT	(14|0x0200)		/* client proxy BIO */
#define BIO_TYPE_PROXY_SERVER	(15|0x0200)		/* server proxy BIO */
#define BIO_TYPE_NBIO_TEST	(16|0x0200)		/* server proxy BIO */
#define BIO_TYPE_NULL_FILTER	(17|0x0200)
#define BIO_TYPE_BER		(18|0x0200)		/* BER -> bin filter */
#define BIO_TYPE_BIO		(19|0x0400)		/* (half a) BIO pair */
#define BIO_TYPE_LINEBUFFER	(20|0x0200)		/* filter */
#define BIO_TYPE_DGRAM		(21|0x0400|0x0100)

#define BIO_TYPE_DESCRIPTOR	0x0100	/* socket, fd, connect or accept */
#define BIO_TYPE_FILTER		0x0200
#define BIO_TYPE_SOURCE_SINK	0x0400

/* BIO_FILENAME_READ|BIO_CLOSE to open or close on free.
 * BIO_set_fp(in,stdin,BIO_NOCLOSE); */
#define BIO_NOCLOSE		0x00
#define BIO_CLOSE		0x01

/* These are used in the following macros and are passed to
 * BIO_ctrl() */
#define BIO_CTRL_RESET		1  /* opt - rewind/zero etc */
#define BIO_CTRL_EOF		2  /* opt - are we at the eof */
#define BIO_CTRL_INFO		3  /* opt - extra tit-bits */
#define BIO_CTRL_SET		4  /* man - set the 'IO' type */
#define BIO_CTRL_GET		5  /* man - get the 'IO' type */
#define BIO_CTRL_PUSH		6  /* opt - internal, used to signify change */
#define BIO_CTRL_POP		7  /* opt - internal, used to signify change */
#define BIO_CTRL_GET_CLOSE	8  /* man - set the 'close' on free */
#define BIO_CTRL_SET_CLOSE	9  /* man - set the 'close' on free */
#define BIO_CTRL_PENDING	10  /* opt - is their more data buffered */
#define BIO_CTRL_FLUSH		11  /* opt - 'flush' buffered output */
#define BIO_CTRL_DUP		12  /* man - extra stuff for 'duped' BIO */
#define BIO_CTRL_WPENDING	13  /* opt - number of bytes still to write */
/* callback is int cb(BIO *bio,state,ret); */
#define BIO_CTRL_SET_CALLBACK	14  /* opt - set callback function */
#define BIO_CTRL_GET_CALLBACK	15  /* opt - set callback function */

#define BIO_CTRL_SET_FILENAME	30	/* BIO_s_file special */

/* dgram BIO stuff */
#define BIO_CTRL_DGRAM_CONNECT       31  /* BIO dgram special */
#define BIO_CTRL_DGRAM_SET_CONNECTED 32  /* allow for an externally
										  * connected socket to be
										  * passed in */ 
#define BIO_CTRL_DGRAM_SET_RECV_TIMEOUT 33 /* setsockopt, essentially */
#define BIO_CTRL_DGRAM_GET_RECV_TIMEOUT 34 /* getsockopt, essentially */
#define BIO_CTRL_DGRAM_SET_SEND_TIMEOUT 35 /* setsockopt, essentially */
#define BIO_CTRL_DGRAM_GET_SEND_TIMEOUT 36 /* getsockopt, essentially */

#define BIO_CTRL_DGRAM_GET_RECV_TIMER_EXP 37 /* flag whether the last */
#define BIO_CTRL_DGRAM_GET_SEND_TIMER_EXP 38 /* I/O operation tiemd out */
					
/* #ifdef IP_MTU_DISCOVER */
#define BIO_CTRL_DGRAM_MTU_DISCOVER       39 /* set DF bit on egress packets */
/* #endif */

#define BIO_CTRL_DGRAM_QUERY_MTU          40 /* as kernel for current MTU */
#define BIO_CTRL_DGRAM_GET_MTU            41 /* get cached value for MTU */
#define BIO_CTRL_DGRAM_SET_MTU            42 /* set cached value for
											  * MTU. want to use this
                                              * if asking the kernel
                                              * fails */

#define BIO_CTRL_DGRAM_MTU_EXCEEDED       43 /* check whether the MTU
											  * was exceed in the
											  * previous write
											  * operation */

#define BIO_CTRL_DGRAM_SET_PEER           44 /* Destination for the data */


/* modifiers */
#define BIO_FP_READ		0x02
#define BIO_FP_WRITE		0x04
#define BIO_FP_APPEND		0x08
#define BIO_FP_TEXT		0x10

#define BIO_FLAGS_READ		0x01
#define BIO_FLAGS_WRITE		0x02
#define BIO_FLAGS_IO_SPECIAL	0x04
#define BIO_FLAGS_RWS (BIO_FLAGS_READ|BIO_FLAGS_WRITE|BIO_FLAGS_IO_SPECIAL)
#define BIO_FLAGS_SHOULD_RETRY	0x08
#ifndef	BIO_FLAGS_UPLINK
/* "UPLINK" flag denotes file descriptors provided by application.
   It defaults to 0, as most platforms don't require UPLINK interface. */
#define	BIO_FLAGS_UPLINK	0
#endif

/* Used in BIO_gethostbyname() */
#define BIO_GHBN_CTRL_HITS		1
#define BIO_GHBN_CTRL_MISSES		2
#define BIO_GHBN_CTRL_CACHE_SIZE	3
#define BIO_GHBN_CTRL_GET_ENTRY		4
#define BIO_GHBN_CTRL_FLUSH		5

/* Mostly used in the SSL BIO */
/* Not used anymore
 * #define BIO_FLAGS_PROTOCOL_DELAYED_READ 0x10
 * #define BIO_FLAGS_PROTOCOL_DELAYED_WRITE 0x20
 * #define BIO_FLAGS_PROTOCOL_STARTUP	0x40
 */

#define BIO_FLAGS_BASE64_NO_NL	0x100

/* This is used with memory BIOs: it means we shouldn't free up or change the
 * data in any way.
 */
#define BIO_FLAGS_MEM_RDONLY	0x200

typedef struct bio_st BIO;

void BIO_set_flags(BIO *b, int flags);
int  BIO_test_flags(const BIO *b, int flags);
void BIO_clear_flags(BIO *b, int flags);

#define BIO_get_flags(b) BIO_test_flags(b, ~(0x0))
#define BIO_set_retry_special(b) \
		BIO_set_flags(b, (BIO_FLAGS_IO_SPECIAL|BIO_FLAGS_SHOULD_RETRY))
#define BIO_set_retry_read(b) \
		BIO_set_flags(b, (BIO_FLAGS_READ|BIO_FLAGS_SHOULD_RETRY))
#define BIO_set_retry_write(b) \
		BIO_set_flags(b, (BIO_FLAGS_WRITE|BIO_FLAGS_SHOULD_RETRY))

/* These are normally used internally in BIOs */
#define BIO_clear_retry_flags(b) \
		BIO_clear_flags(b, (BIO_FLAGS_RWS|BIO_FLAGS_SHOULD_RETRY))
#define BIO_get_retry_flags(b) \
		BIO_test_flags(b, (BIO_FLAGS_RWS|BIO_FLAGS_SHOULD_RETRY))

/* These should be used by the application to tell why we should retry */
#define BIO_should_read(a)		BIO_test_flags(a, BIO_FLAGS_READ)
#define BIO_should_write(a)		BIO_test_flags(a, BIO_FLAGS_WRITE)
#define BIO_should_io_special(a)	BIO_test_flags(a, BIO_FLAGS_IO_SPECIAL)
#define BIO_retry_type(a)		BIO_test_flags(a, BIO_FLAGS_RWS)
#define BIO_should_retry(a)		BIO_test_flags(a, BIO_FLAGS_SHOULD_RETRY)

/* The next three are used in conjunction with the
 * BIO_should_io_special() condition.  After this returns true,
 * BIO *BIO_get_retry_BIO(BIO *bio, int *reason); will walk the BIO 
 * stack and return the 'reason' for the special and the offending BIO.
 * Given a BIO, BIO_get_retry_reason(bio) will return the code. */
/* Returned from the SSL bio when the certificate retrieval code had an error */
#define BIO_RR_SSL_X509_LOOKUP		0x01
/* Returned from the connect BIO when a connect would have blocked */
#define BIO_RR_CONNECT			0x02
/* Returned from the accept BIO when an accept would have blocked */
#define BIO_RR_ACCEPT			0x03

/* These are passed by the BIO callback */
#define BIO_CB_FREE	0x01
#define BIO_CB_READ	0x02
#define BIO_CB_WRITE	0x03
#define BIO_CB_PUTS	0x04
#define BIO_CB_GETS	0x05
#define BIO_CB_CTRL	0x06

/* The callback is called before and after the underling operation,
 * The BIO_CB_RETURN flag indicates if it is after the call */
#define BIO_CB_RETURN	0x80
#define BIO_CB_return(a) ((a)|BIO_CB_RETURN))
#define BIO_cb_pre(a)	(!((a)&BIO_CB_RETURN))
#define BIO_cb_post(a)	((a)&BIO_CB_RETURN)

long (*BIO_get_callback(const BIO *b)) (struct bio_st *,int,const char *,int, long,long);
void BIO_set_callback(BIO *b, 
	long (*callback)(struct bio_st *,int,const char *,int, long,long));
char *BIO_get_callback_arg(const BIO *b);
void BIO_set_callback_arg(BIO *b, char *arg);

const char * BIO_method_name(const BIO *b);