path: root/crypto/bio/bio.h

/* 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_ASN1           (22|0x0200)/* filter */
# define BIO_TYPE_COMP           (23|0x0200)/* filter */

# 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_FALLBACK_MTU   47
# 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_GET_PEER           46
# define BIO_CTRL_DGRAM_SET_PEER           44/* Destination for the data */

# define BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT   45/* Next DTLS handshake timeout
                                              * to adjust socket timeouts */
# define BIO_CTRL_DGRAM_GET_MTU_OVERHEAD   49

/* 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);
int BIO_method_type(const BIO *b);

typedef void bio_info_cb (struct bio_st *, int, const char *, int, long,
                          long);

typedef struct bio_method_st {
    int type;
    const char *name;
    int (*bwrite) (BIO *, const char *, int);
    int (*bread) (BIO *, char *, int);
    int (*bputs) (BIO *, const char *);
    int (*bgets) (BIO *, char *, int);
    long (*ctrl) (BIO *, int, long, void *);
    int