/*
 * Copyright 2005-2016 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the OpenSSL license (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#include "e_os.h"
#include "internal/sockets.h"
#include "internal/refcount.h"

/* BEGIN BIO_ADDRINFO/BIO_ADDR stuff. */

#ifndef OPENSSL_NO_SOCK
/*
 * Throughout this file and b_addr.c, the existence of the macro
 * AI_PASSIVE is used to detect the availability of struct addrinfo,
 * getnameinfo() and getaddrinfo().  If that macro doesn't exist,
 * we use our own implementation instead.
 */

/*
 * It's imperative that these macros get defined before openssl/bio.h gets
 * included.  Otherwise, the AI_PASSIVE hack will not work properly.
 * For clarity, we check for internal/cryptlib.h since it's a common header
 * that also includes bio.h.
 */
# ifdef OSSL_INTERNAL_CRYPTLIB_H
#  error internal/cryptlib.h included before bio_local.h
# endif
# ifdef HEADER_BIO_H
#  error openssl/bio.h included before bio_local.h
# endif

/*
 * Undefine AF_UNIX on systems that define it but don't support it.
 */
# if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_VMS)
#  undef AF_UNIX
# endif

# ifdef AI_PASSIVE

/*
 * There's a bug in VMS C header file netdb.h, where struct addrinfo
 * always is the P32 variant, but the functions that handle that structure,
 * such as getaddrinfo() and freeaddrinfo() adapt to the initial pointer
 * size.  The easiest workaround is to force struct addrinfo to be the
 * 64-bit variant when compiling in P64 mode.
 */
#  if defined(OPENSSL_SYS_VMS) && __INITIAL_POINTER_SIZE == 64
#   define addrinfo __addrinfo64
#  endif

#  define bio_addrinfo_st addrinfo
#  define bai_family      ai_family
#  define bai_socktype    ai_socktype
#  define bai_protocol    ai_protocol
#  define bai_addrlen     ai_addrlen
#  define bai_addr        ai_addr
#  define bai_next        ai_next
# else
struct bio_addrinfo_st {
    int bai_family;
    int bai_socktype;
    int bai_protocol;
    size_t bai_addrlen;
    struct sockaddr *bai_addr;
    struct bio_addrinfo_st *bai_next;
};
# endif

union bio_addr_st {
    struct sockaddr sa;
# ifdef AF_INET6
    struct sockaddr_in6 s_in6;
# endif
    struct sockaddr_in s_in;
# ifdef AF_UNIX
    struct sockaddr_un s_un;
# endif
};
#endif

/* END BIO_ADDRINFO/BIO_ADDR stuff. */

#include "internal/cryptlib.h"
#include "internal/bio.h"

typedef struct bio_f_buffer_ctx_struct {
    /*-
     * Buffers are setup like this:
     *
     * <---------------------- size ----------------------->
     * +---------------------------------------------------+
     * | consumed | remaining          | free space        |
     * +---------------------------------------------------+
     * <-- off --><------- len ------->
     */
    /*- BIO *bio; *//*
     * this is now in the BIO struct
     */
    int ibuf_size;              /* how big is the input buffer */
    int obuf_size;              /* how big is the output buffer */
    char *ibuf;                 /* the char array */
    int ibuf_len;               /* how many bytes are in it */
    int ibuf_off;               /* write/read offset */
    char *obuf;                 /* the char array */
    int obuf_len;               /* how many bytes are in it */
    int obuf_off;               /* write/read offset */
} BIO_F_BUFFER_CTX;

struct bio_st {
    const BIO_METHOD *method;
    /* bio, mode, argp, argi, argl, ret */
    BIO_callback_fn callback;
    BIO_callback_fn_ex callback_ex;
    char *cb_arg;               /* first argument for the callback */
    int init;
    int shutdown;
    int flags;                  /* extra storage */
    int retry_reason;
    int num;
    void *ptr;
    struct bio_st *next_bio;    /* used by filter BIOs */
    struct bio_st *prev_bio;    /* used by filter BIOs */
    CRYPTO_REF_COUNT references;
    uint64_t num_read;
    uint64_t num_write;
    CRYPTO_EX_DATA ex_data;
    CRYPTO_RWLOCK *lock;
};

#ifndef OPENSSL_NO_SOCK
# ifdef OPENSSL_SYS_VMS
typedef unsigned int socklen_t;
# endif

extern CRYPTO_RWLOCK *bio_lookup_lock;

int BIO_ADDR_make(BIO_ADDR *ap, const struct sockaddr *sa);
const struct sockaddr *BIO_ADDR_sockaddr(const BIO_ADDR *ap);
struct sockaddr *BIO_ADDR_sockaddr_noconst(BIO_ADDR *ap);
socklen_t BIO_ADDR_sockaddr_size(const BIO_ADDR *ap);
socklen_t BIO_ADDRINFO_sockaddr_size(const BIO_ADDRINFO *bai);
const struct sockaddr *BIO_ADDRINFO_sockaddr(const BIO_ADDRINFO *bai);
#endif

extern CRYPTO_RWLOCK *bio_type_lock;

void bio_sock_cleanup_int(void);

#if BIO_FLAGS_UPLINK==0
/* Shortcut UPLINK calls on most platforms... */
# define UP_stdin        stdin
# define UP_stdout       stdout
# define UP_stderr       stderr
# define UP_fprintf      fprintf
# define UP_fgets        fgets
# define UP_fread        fread
# define UP_fwrite       fwrite
# undef  UP_fsetmod
# define UP_feof         feof
# define UP_fclose       fclose

# define UP_fopen        fopen
# define UP_fseek        fseek
# define UP_ftell        ftell
# define UP_fflush       fflush
# define UP_ferror       ferror
# ifdef _WIN32
#  define UP_fileno       _fileno
#  define UP_open         _open
#  define UP_read         _read
#  define UP_write        _write
#  define UP_lseek        _lseek
#  define UP_close        _close
# else
#  define UP_fileno       fileno
#  define UP_open         open
#  define UP_read         read
#  define UP_write        write
#  define UP_lseek        lseek
#  define UP_close        close
# endif

#endif

