/* 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 OPENSSL_HEADER_BIO_H #define OPENSSL_HEADER_BIO_H #include #include /* For FILE */ #include #include /* for ERR_print_errors_fp */ #include #include #include #if defined(__cplusplus) extern "C" { #endif /* BIO abstracts over a file-descriptor like interface. */ /* Allocation and freeing. */ /* BIO_new creates a new BIO with the given type and a reference count of one. * It returns the fresh |BIO|, or NULL on error. */ OPENSSL_EXPORT BIO *BIO_new(const BIO_METHOD *type); /* BIO_free decrements the reference count of |bio|. If the reference count * drops to zero, it (optionally) calls the BIO's callback with |BIO_CB_FREE|, * frees the ex_data and then, if the BIO has a destroy callback for the * method, calls it. Finally it frees |bio| itself. It then repeats that for * the next BIO in the chain, if any. * * It returns one on success or zero otherwise. */ OPENSSL_EXPORT int BIO_free(BIO *bio); /* BIO_vfree performs the same actions as |BIO_free|, but has a void return * value. This is provided for API-compat. * * TODO(fork): remove. */ OPENSSL_EXPORT void BIO_vfree(BIO *bio); /* BIO_up_ref increments the reference count of |bio| and returns it. */ OPENSSL_EXPORT BIO *BIO_up_ref(BIO *bio); /* Basic I/O. */ /* BIO_read attempts to read |len| bytes into |data|. It returns the number of * bytes read, zero on EOF, or a negative number on error. */ OPENSSL_EXPORT int BIO_read(BIO *bio, void *data, int len); /* BIO_gets "reads a line" from |bio| and puts at most |size| bytes into |buf|. * It returns the number of bytes read or a negative number on error. The * phrase "reads a line" is in quotes in the previous sentence because the * exact operation depends on the BIO's method. For example, a digest BIO will * return the digest in response to a |BIO_gets| call. * * TODO(fork): audit the set of BIOs that we end up needing. If all actually * return a line for this call, remove the warning above. */ OPENSSL_EXPORT int BIO_gets(BIO *bio, char *buf, int size); /* BIO_write writes |len| bytes from |data| to BIO. It returns the number of * bytes written or a negative number on error. */ OPENSSL_EXPORT int BIO_write(BIO *bio, const void *data, int len); /* BIO_puts writes a NUL terminated string from |buf| to |bio|. It returns the * number of bytes written or a negative number on error. */ OPENSSL_EXPORT int BIO_puts(BIO *bio, const char *buf); /* BIO_flush flushes any buffered output. It returns one on success and zero * otherwise. */ OPENSSL_EXPORT int BIO_flush(BIO *bio); /* Low-level control functions. * * These are generic functions for sending control requests to a BIO. In * general one should use the wrapper functions like |BIO_get_close|. */ /* BIO_ctrl sends the control request |cmd| to |bio|. The |cmd| argument should * be one of the |BIO_C_*| values. */ OPENSSL_EXPORT long BIO_ctrl(BIO *bio, int cmd, long larg, void *parg); /* BIO_ptr_ctrl acts like |BIO_ctrl| but passes the address of a |void*| * pointer as |parg| and returns the value that is written to it, or NULL if * the control request returns <= 0. */ OPENSSL_EXPORT char *BIO_ptr_ctrl(BIO *bp, int cmd, long larg); /* BIO_int_ctrl acts like |BIO_ctrl| but passes the address of a copy of |iarg| * as |parg|. */ OPENSSL_EXPORT long BIO_int_ctrl(BIO *bp, int cmd, long larg, int iarg); /* BIO_reset resets |bio| to its initial state, the precise meaning of which * depends on the concrete type of |bio|. It returns one on success and zero * otherwise. */ OPENSSL_EXPORT int BIO_reset(BIO *bio); /* BIO_set_flags ORs |flags| with |bio->flags|. */ OPENSSL_EXPORT void BIO_set_flags(BIO *bio, int flags); /* BIO_test_flags returns |bio->flags| AND |flags|. */ OPENSSL_EXPORT int BIO_test_flags(const BIO *bio, int flags); /* BIO_should_read returns non-zero if |bio| encountered a temporary error * while reading (i.e. EAGAIN), indicating that the caller should retry the * read. */ OPENSSL_EXPORT int BIO_should_read(const BIO *bio); /* BIO_should_write returns non-zero if |bio| encountered a temporary error * while writing (i.e. EAGAIN), indicating that the caller should retry the * write. */ OPENSSL_EXPORT int BIO_should_write(const BIO *bio); /* BIO_should_retry returns non-zero if the reason that caused a failed I/O * operation is temporary and thus the operation should be retried. Otherwise, * it was a permanent error and it returns zero. */ OPENSSL_EXPORT int BIO_should_retry(const BIO *bio); /* BIO_should_io_special returns non-zero if |bio| encountered a temporary * error while performing a special I/O operation, indicating that the caller * should retry. The operation that caused the error is returned by * |BIO_get_retry_reason|. */ OPENSSL_EXPORT int BIO_should_io_special(const BIO *bio); /* BIO_RR_SSL_X509_LOOKUP indicates that an SSL BIO blocked because the SSL * library returned with SSL_ERROR_WANT_X509_LOOKUP. * * TODO(fork): remove. */ #define BIO_RR_SSL_X509_LOOKUP 0x01 /* BIO_RR_CONNECT indicates that a connect would have blocked */ #define BIO_RR_CONNECT 0x02 /* BIO_RR_ACCEPT indicates that an accept would have blocked */ #define BIO_RR_ACCEPT 0x03 /* BIO_RR_SSL_CHANNEL_ID_LOOKUP indicates that the ChannelID code cannot find * a private key for a TLS connection. */ #define BIO_RR_SSL_CHANNEL_ID_LOOKUP 0x04 /* BIO_get_retry_reason returns the special I/O operation that needs to be * retried. The return value is one of the |BIO_RR_*| values. */ OPENSSL_EXPORT int BIO_get_retry_reason(const BIO *bio); /* BIO_clear_flags ANDs |bio->flags| with the bitwise-complement of |flags|. */ OPENSSL_EXPORT void BIO_clear_flags(BIO *bio, int flags); /* BIO_set_retry_read sets the |BIO_FLAGS_READ| and |BIO_FLAGS_SHOULD_RETRY| * flags on |bio|. */ OPENSSL_EXPORT void BIO_set_retry_read(BIO *bio); /* BIO_set_retry_write sets the |BIO_FLAGS_WRITE| and |BIO_FLAGS_SHOULD_RETRY| * flags on |bio|. */ OPENSSL_EXPORT void BIO_set_retry_write(BIO *bio); /* BIO_get_retry_flags gets the |BIO_FLAGS_READ|, |BIO_FLAGS_WRITE|, * |BIO_FLAGS_IO_SPECIAL| and |BIO_FLAGS_SHOULD_RETRY| flags from |bio|. */ OPENSSL_EXPORT int BIO_get_retry_flags(BIO *bio); /* BIO_clear_retry_flags clears the |BIO_FLAGS_READ|, |BIO_FLAGS_WRITE|, * |BIO_FLAGS_IO_SPECIAL| and |BIO_FLAGS_SHOULD_RETRY| flags from |bio|. */ OPENSSL_EXPORT void BIO_clear_retry_flags(BIO *bio); /* BIO_method_type returns the type of |bio|, which is one of the |BIO_TYPE_*| * values. */ OPENSSL_EXPORT int BIO_method_type(const BIO *bio); /* bio_info_cb is the type of a callback function that can be called for most * BIO operations. The |event| argument is one of |BIO_CB_*| and can be ORed * with |BIO_CB_RETURN| if the callback is being made after the operation in * question. In that case, |return_value| will contain the return value from * the operation. */ typedef long (*bio_info_cb)(BIO *bio, int event, const char *parg, int cmd, long larg, long return_value); /* BIO_callback_ctrl allows the callback function to be manipulated. The |cmd| * arg will generally be |BIO_CTRL_SET_CALLBACK| but arbitary command values * can be interpreted by the |BIO|. */ OPENSSL_EXPORT long BIO_callback_ctrl(BIO *bio, int cmd, bio_info_cb fp); /* BIO_pending returns the number of bytes pending to be read. */ OPENSSL_EXPORT size_t BIO_pending(const BIO *bio); /* BIO_ctrl_pending calls |BIO_pending| and exists only for compatibility with * OpenSSL. */ OPENSSL_EXPORT size_t BIO_ctrl_pending(const BIO *bio); /* BIO_wpending returns the number of bytes pending to be written. */ OPENSSL_EXPORT size_t BIO_wpending(const BIO *bio); /* BIO_set_close sets the close flag for |bio|. The meaning of which depends on * the type of |bio| but, for example, a memory BIO interprets the close flag * as meaning that it owns its buffer. It returns one on success and zero * otherwise. */ OPENSSL_EXPORT int BIO_set_close(BIO *bio, int close_flag); /* BIO_set_callback sets a callback function that will be called before and * after most operations. See the comment above |bio_info_cb|. */ OPENSSL_EXPORT void BIO_set_callback(BIO *bio, bio_info_cb callback_func); /* BIO_set_callback_arg sets the opaque pointer value that can be read within a * callback with |BIO_get_callback_arg|. */ OPENSSL_EXPORT void BIO_set_callback_arg(BIO *bio, char *arg); /* BIO_get_callback_arg returns the last value of the opaque callback pointer * set by |BIO_set_callback_arg|. */ OPENSSL_EXPORT char *BIO_get_callback_arg(const BIO *bio); /* BIO_number_read returns the number of bytes that have been read from * |bio|. */ OPENSSL_EXPORT size_t BIO_number_read(const BIO *bio); /* BIO_number_written returns the number of bytes that have been written to * |bio|. */ OPENSSL_EXPORT size_t BIO_number_written(const BIO *bio); /* Managing chains of BIOs. * * BIOs can be put into chains where the output of one is used as the input of * the next etc. The most common case is a buffering BIO, which accepts and * buffers writes until flushed into the next BIO in the chain. */ /* BIO_push adds |appended_bio| to the end of the chain with |bio| at the head. * It returns |bio|. Note that |appended_bio| may be the head of a chain itself * and thus this function can be used to join two chains. * * BIO_push takes ownership of the caller's reference to |appended_bio|. */ OPENSSL_EXPORT BIO *BIO_push(BIO *bio, BIO *appended_bio); /* BIO_pop removes |bio| from the head of a chain and returns the next BIO in * the chain, or NULL if there is no next BIO. * * The caller takes ownership of the chain's reference to |bio|. */ OPENSSL_EXPORT BIO *BIO_pop(BIO *bio); /* BIO_next returns the next BIO in the chain after |bio|, or NULL if there is * no such BIO. */ OPENSSL_EXPORT BIO *BIO_next(BIO *bio); /* BIO_free_all calls |BIO_free|. * * TODO(fork): update callers and remove. */ OPENSSL_EXPORT void BIO_free_all(BIO *bio); /* BIO_find_type walks a chain of BIOs and returns the first that matches * |type|, which is one of the |BIO_TYPE_*| values. */ OPENSSL_EXPORT BIO *BIO_find_type(BIO *bio, int type); /* BIO_copy_next_retry sets the retry flags and |retry_reason| of |bio| from * the next BIO in the chain. */ OPENSSL_EXPORT void BIO_copy_next_retry(BIO *bio); /* Printf functions. */ /* BIO_printf behaves like |printf| but outputs to |bio| rather than a |FILE|. * It returns the number of bytes written or a negative number on error. */ OPENSSL_EXPORT int BIO_printf(BIO *bio, const char *format, ...) OPENSSL_PRINTF_FORMAT_FUNC(2, 3); /* Utility functions. */ /* BIO_indent prints min(|indent|, |max_indent|) spaces. It returns one on * success and zero otherwise. */ OPENSSL_EXPORT int BIO_indent(BIO *bio, unsigned indent, unsigned max_indent); /* BIO_hexdump writes a hex dump of |data| to |bio|. Each line will be indented * by |indent| spaces. */ OPENSSL_EXPORT int BIO_hexdump(BIO *bio, const uint8_t *data, size_t len, unsigned indent); /* BIO_print_errors prints the current contents of the error stack to |bio| * using human readable strings where possible. */ OPENSSL_EXPORT void BIO_print_errors(BIO *bio); /* BIO_read_asn1 reads a single ASN.1 object from |bio|. If successful it sets * |*out| to be an allocated buffer (that should be freed with |OPENSSL_free|), * |*out_size| to the length, in bytes, of that buffer and returns one. * Otherwise it returns zero. * * If the length of the object is greater than |max_len| or 2^32 then the * function will fail. Long-form tags are not supported. If the length of the * object is indefinite the full contents of |bio| are read, unless it would be * greater than |max_len|, in which case the function fails. * * If the function fails then some unknown amount of data may have been read * from |bio|. */ OPENSSL_EXPORT int BIO_read_asn1(BIO *bio, uint8_t **out, size_t *out_len, size_t max_len); /* Memory BIOs. * * Memory BIOs can be used as a read-only source (with |BIO_new_mem_buf|) or a * writable sink (with |BIO_new|, |BIO_s_mem| and |BIO_get_mem_buf|). Data * written to a writable, memory BIO can be recalled by reading from it. * * Calling |BIO_reset| on a read-only BIO resets it to the original contents. * On a writable BIO, it clears any data. * * If the close flag is set to |BIO_NOCLOSE| (not the default) then the * underlying |BUF_MEM| will not be freed when the |BIO| is freed. * * Memory BIOs support |BIO_gets| and |BIO_puts|. * * |BIO_ctrl_pending| returns the number of bytes currently stored. */ /* BIO_s_mem returns a |BIO_METHOD| that uses a in-memory buffer. */ OPENSSL_EXPORT const BIO_METHOD *BIO_s_mem(void); /* BIO_new_mem_buf creates read-only BIO that reads from |len| bytes at |buf|. * It does not take ownership of |buf|. It returns the BIO or NULL on error. * * If |len| is negative, then |buf| is treated as a NUL-terminated string, but * don't depend on this in new code. */ OPENSSL_EXPORT BIO *BIO_new_mem_buf(const void *buf, int len); /* BIO_mem_contents sets |*out_contents| to point to the current contents of * |bio| and |*out_len| to contain the length of that data. It returns one on * success and zero otherwise. */ OPENSSL_EXPORT int BIO_mem_contents(const BIO *bio, const uint8_t **out_contents, size_t *out_len); /* BIO_get_mem_data sets |*contents| to point to the current contents of |bio| * and returns the length of the data. * * WARNING: don't use this, use |BIO_mem_contents|. A return value of zero from * this function can mean either that it failed or that the memory buffer is * empty. */ OPENSSL_EXPORT long BIO_get_mem_data(BIO *bio, char **contents); /* BIO_get_mem_ptr sets |*out| to a BUF_MEM containing the current contents of * |bio|. It returns one on success or zero on error. */ OPENSSL_EXPORT int BIO_get_mem_ptr(BIO *bio, BUF_MEM **out); /* BIO_set_mem_buf sets |b| as the contents of |bio|. If |take_ownership| is * non-zero, then |b| will be freed when |bio| is closed. Returns one on * success or zero otherwise. */ OPENSSL_EXPORT int BIO_set_mem_buf(BIO *bio, BUF_MEM *b, int take_ownership); /* BIO_set_mem_eof_return sets the value that will be returned from reading * |bio| when empty. If |eof_value| is zero then an empty memory BIO will * return EOF (that is it will return zero and |BIO_should_retry| will be * false). If |eof_value| is non zero then it will return |eof_value| when it * is empty and it will set the read retry flag (that is |BIO_read_retry| is * true). To avoid ambiguity with a normal positive return value, |eof_value| * should be set to a negative value, typically -1. * * For a read-only BIO, the default is zero (EOF). For a writable BIO, the * default is -1 so that additional data can be written once exhausted. */ OPENSSL_EXPORT int BIO_set_mem_eof_return(BIO *bio, int eof_value); /* File descriptor BIOs. * * File descriptor BIOs are wrappers around the system's |read| and |write| * functions. If the close flag is set then then |close| is called on the * underlying file descriptor when the BIO is freed. * * |BIO_reset| attempts to seek the file pointer to the start of file using * |lseek|. */ /* BIO_s_fd returns a |BIO_METHOD| for file descriptor fds. */ OPENSSL_EXPORT const BIO_METHOD *BIO_s_fd(void); /* BIO_new_fd creates a new file descriptor BIO wrapping |fd|. If |close_flag| * is non-zero, then |fd| will be closed when the BIO is. */ OPENSSL_EXPORT BIO *BIO_new_fd(int fd, int close_flag); /* BIO_set_fd sets the file descriptor of |bio| to |fd|. If |close_flag| is * non-zero then |fd| will be closed when |bio| is. It returns one on success * or zero on error. * * This function may also be used with socket BIOs (see |BIO_s_socket| and * |BIO_new_socket|). */ OPENSSL_EXPORT int BIO_set_fd(BIO *bio, int fd, int close_flag); /* BIO_get_fd returns the file descriptor currently in use by |bio| or -1 if * |bio| does not wrap a file descriptor. If there is a file descriptor and * |out_fd| is not NULL, it also sets |*out_fd| to the file descriptor. * * This function may also be used with socket BIOs (see |BIO_s_socket| and * |BIO_new_socket|). */ OPENSSL_EXPORT int BIO_get_fd(BIO *bio, int *out_fd); /* File BIOs. * * File BIOs are wrappers around a C |FILE| object. * * |BIO_flush| on a file BIO calls |fflush| on the wrapped stream. * * |BIO_reset| attempts to seek the file pointer to the start of file using * |fseek|. * * Setting the close flag causes |fclose| to be called on the stream when the * BIO is freed. */ /* BIO_s_file returns a BIO_METHOD that wraps a |FILE|. */ OPENSSL_EXPORT const BIO_METHOD *BIO_s_file(void); /* BIO_new_file creates a file BIO by opening |filename| with the given mode. * See the |fopen| manual page for details of the mode argument. */ OPENSSL_EXPORT BIO *BIO_new_file(const char *filename, const char *mode); /* BIO_new_fp creates a new file BIO that wraps the given |FILE|. If * |close_flag| is |BIO_CLOSE|, then |fclose| will be called on |stream| when * the BIO is closed. */ OPENSSL_EXPORT BIO *BIO_new_fp(FILE *stream, int close_flag); /* BIO_get_fp sets |*out_file| to the current |FILE| for |bio|. It returns one * on success and zero otherwise. */ OPENSSL_EXPORT int BIO_get_fp(BIO *bio, FILE **out_file); /* BIO_set_fp sets the |FILE| for |bio|. If |close_flag| is |BIO_CLOSE| then * |fclose| will be called on |file| when |bio| is closed. It returns one on * sucess and zero otherwise. */ OPENSSL_EXPORT int BIO_set_fp(BIO *bio, FILE *file, int close_flag); /* BIO_read_filename opens |filename| for reading and sets the result as the * |FILE| for |bio|. It returns one on success and zero otherwise. The |FILE| * will be closed when |bio| is freed. */ OPENSSL_EXPORT int BIO_read_filename(BIO *bio, const char *filename); /* BIO_write_filename opens |filename| for writing and sets the result as the * |FILE| for |bio|. It returns one on success and zero otherwise. The |FILE| * will be closed when |bio| is freed. */ OPENSSL_EXPORT int BIO_write_filename(BIO *bio, const char *filename); /* BIO_append_filename opens |filename| for appending and sets the result as * the |FILE| for |bio|. It returns one on success and zero otherwise. The * |FILE| will be closed when |bio| is freed. */ OPENSSL_EXPORT int BIO_append_filename(BIO *bio, const char *filename); /* BIO_rw_filename opens |filename| for reading and writing and sets the result * as the |FILE| for |bio|. It returns one on success and zero otherwise. The * |FILE| will be closed when |bio| is freed. */ OPENSSL_EXPORT int BIO_rw_filename(BIO *bio, const char *filename); /* Buffer BIOs. * * Buffer BIOs are a filter-type BIO, i.e. they are designed to be used in a * chain of BIOs. They provide buffering to reduce the number of operations on * the underlying BIOs. */ OPENSSL_EXPORT const BIO_METHOD *BIO_f_buffer(void); /* BIO_set_read_buffer_size sets the size, in bytes, of the read buffer and * clears it. It returns one on success and zero on failure. */ OPENSSL_EXPORT int BIO_set_read_buffer_size(BIO *bio, int buffer_size); /* BIO_set_write_buffer_size sets the size, in bytes, of the write buffer and * clears it. It returns one on success and zero on failure. */ OPENSSL_EXPORT int BIO_set_write_buffer_size(BIO *bio, int buffer_size); /* Socket BIOs. * * Socket BIOs behave like file descriptor BIOs but, on Windows systems, wrap * the system's |recv| and |send| functions instead of |read| and |write|. On * Windows, file descriptors are provided by C runtime and are not * interchangeable with sockets. * * Socket BIOs may be used with |BIO_set_fd| and |BIO_get_fd|. * * TODO(davidben): Add separate APIs and fix the internals to use |SOCKET|s * around rather than rely on int casts. */ OPENSSL_EXPORT const BIO_METHOD *BIO_s_socket(void); /* BIO_new_socket allocates and initialises a fresh BIO which will read and * write to the socket |fd|. If |close_flag| is |BIO_CLOSE| then closing the * BIO will close |fd|. It returns the fresh |BIO| or NULL on error. */ OPENSSL_EXPORT BIO *BIO_new_socket(int fd, int close_flag); /* Connect BIOs. * * A connection BIO creates a network connection and transfers data over the * resulting socket. */ OPENSSL_EXPORT const BIO_METHOD *BIO_s_connect(void); /* BIO_new_connect returns a BIO that connects to the given hostname and port. * The |host_and_optional_port| argument should be of the form * "www.example.com" or "www.example.com:443". If the port is omitted, it must * be provided with |BIO_set_conn_port|. * * It returns the new BIO on success, or NULL on error. */ OPENSSL_EXPORT BIO *BIO_new_connect(const char *host_and_optional_port); /* BIO_set_conn_hostname sets |host_and_optional_port| as the hostname and * optional port that |bio| will connect to. If the port is omitted, it must be * provided with |BIO_set_conn_port|. * * It returns one on success and zero otherwise. */ OPENSSL_EXPORT int BIO_set_conn_hostname(BIO *bio, const char *host_and_optional_port); /* BIO_set_conn_port sets |port_str| as the port or service name that |bio| * will connect to. It returns one on success and zero otherwise. */ OPENSSL_EXPORT int BIO_set_conn_port(BIO *bio, const char *port_str); /* BIO_set_conn_int_port sets |*port| as the port that |bio| will connect to. * It returns one on success and zero otherwise. */ OPENSSL_EXPORT int BIO_set_conn_int_port(BIO *bio, const int *port); /* BIO_set_nbio sets whether |bio| will use non-blocking I/O operations. It * returns one on success and zero otherwise. */ OPENSSL_EXPORT int BIO_set_nbio(BIO *bio, int on); /* BIO_do_connect connects |bio| if it has not been connected yet. It returns * one on success and <= 0 otherwise. */ OPENSSL_EXPORT int BIO_do_connect(BIO *bio); /* Datagram BIOs. * * TODO(fork): not implemented. */ #define BIO_CTRL_DGRAM_QUERY_MTU 40 /* as kernel for current 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_NEXT_TIMEOUT \ 45 /* Next DTLS handshake timeout to adjust socket timeouts */ #define BIO_CTRL_DGRAM_GET_PEER 46 #define BIO_CTRL_DGRAM_GET_FALLBACK_MTU 47 /* BIO Pairs. * * BIO pairs provide a "loopback" like system: a pair of BIOs where data * written to one can be read from the other and vice versa. */ /* BIO_new_bio_pair sets |*out1| and |*out2| to two freshly created BIOs where * data written to one can be read from the other and vice versa. The * |writebuf1| argument gives the size of the buffer used in |*out1| and * |writebuf2| for |*out2|. It returns one on success and zero on error. */ OPENSSL_EXPORT int BIO_new_bio_pair(BIO **out1, size_t writebuf1, BIO **out2, size_t writebuf2); /* BIO_new_bio_pair_external_buf is the same as |BIO_new_bio_pair| with the * difference that the caller keeps ownership of the write buffers * |ext_writebuf1_len| and |ext_writebuf2_len|. This is useful when using zero * copy API for read and write operations, in cases where the buffers need to * outlive the BIO pairs. It returns one on success and zero on error. */ OPENSSL_EXPORT int BIO_new_bio_pair_external_buf(BIO** bio1_p, size_t writebuf1_len, uint8_t* ext_writebuf1, BIO** bio2_p, size_t writebuf2_len, uint8_t* ext_writebuf2); /* BIO_ctrl_get_read_request returns the number of bytes that the other side of * |bio| tried (unsuccessfully) to read. */ OPENSSL_EXPORT size_t BIO_ctrl_get_read_request(BIO *bio); /* BIO_ctrl_get_write_guarantee returns the number of bytes that |bio| (which * must have been returned by |BIO_new_bio_pair|) will accept on the next * |BIO_write| call. */ OPENSSL_EXPORT size_t BIO_ctrl_get_write_guarantee(BIO *bio); /* BIO_shutdown_wr marks |bio| as closed, from the point of view of the other * side of the pair. Future |BIO_write| calls on |bio| will fail. It returns * one on success and zero otherwise. */ OPENSSL_EXPORT int BIO_shutdown_wr(BIO *bio); /* Zero copy versions of BIO_read and BIO_write for BIO pairs. */ /* BIO_zero_copy_get_read_buf initiates a zero copy read operation. * |out_read_buf| is set to the internal read buffer, and |out_buf_offset| is * set to the current read position of |out_read_buf|. The number of bytes * available for read from |out_read_buf| + |out_buf_offset| is returned in * |out_available_bytes|. Note that this function might report fewer bytes * available than |BIO_pending|, if the internal ring buffer is wrapped. It * returns one on success. In case of error it returns zero and pushes to the * error stack. * * The zero copy read operation is completed by calling * |BIO_zero_copy_get_read_buf_done|. Neither |BIO_zero_copy_get_read_buf| nor * any other I/O read operation may be called while a zero copy read operation * is active. */ OPENSSL_EXPORT int BIO_zero_copy_get_read_buf(BIO* bio, uint8_t** out_read_buf, size_t* out_buf_offset, size_t* out_available_bytes); /* BIO_zero_copy_get_read_buf_done must be called after reading from a BIO using * |BIO_zero_copy_get_read_buf| to finish the read operation. The |bytes_read| * argument is the number of bytes read. * * It returns one on success. In case of error it returns zero and pushes to the * error stack. */ OPENSSL_EXPORT int BIO_zero_copy_get_read_buf_done(BIO* bio, size_t bytes_read); /* BIO_zero_copy_get_write_buf initiates a zero copy write operation. * |out_write_buf| is set to to the internal write buffer, and |out_buf_offset| * is set to the current write position of |out_write_buf|. * The number of bytes available for write from |out_write_buf| + * |out_buf_offset| is returned in |out_available_bytes|. Note that this * function might report fewer bytes available than * |BIO_ctrl_get_write_guarantee|, if the internal buffer is wrapped. It returns * one on success. In case of error it returns zero and pushes to the error * stack. * * The zero copy write operation is completed by calling * |BIO_zero_copy_get_write_buf_done|. Neither |BIO_zero_copy_get_write_buf| * nor any other I/O write operation may be called while a zero copy write * operation is active. */ OPENSSL_EXPORT int BIO_zero_copy_get_write_buf(BIO* bio, uint8_t** out_write_buf, size_t* out_buf_offset, size_t* out_available_bytes); /* BIO_zero_copy_get_write_buf_done must be called after writing to a BIO using * |BIO_zero_copy_get_write_buf| to finish the write operation. The * |bytes_written| argument gives the number of bytes written. * * It returns one on success. In case of error it returns zero and pushes to the * error stack. */ OPENSSL_EXPORT int BIO_zero_copy_get_write_buf_done(BIO* bio, size_t bytes_written); /* BIO_NOCLOSE and |BIO_CLOSE| can be used as symbolic arguments when a "close * flag" is passed to a BIO function. */ #define BIO_NOCLOSE 0 #define BIO_CLOSE 1 /* These are passed to 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 /* These are values of the |cmd| argument 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_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_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 */ /* These are never used, but exist to allow code to compile more easily. */ #define BIO_CTRL_DUP 100 #define BIO_CTRL_PUSH 101 #define BIO_CTRL_POP 102 /* Android compatibility section. * * A previous version of BoringSSL used in Android renamed ERR_print_errors_fp * to BIO_print_errors_fp. It has subsequently been renamed back to * ERR_print_errors_fp. */ #define BIO_print_errors_fp ERR_print_errors_fp /* Deprecated functions. */ /* BIO_f_base64 returns a filter |BIO| that base64-encodes data written into * it, and decodes data read from it. |BIO_gets| is not supported. Call * |BIO_flush| when done writing, to signal that no more data are to be * encoded. The flag |BIO_FLAGS_BASE64_NO_NL| may be set to encode all the data * on one line. */ OPENSSL_EXPORT const BIO_METHOD *BIO_f_base64(void); /* ERR_print_errors is an alias for |BIO_print_errors|. */ OPENSSL_EXPORT void ERR_print_errors(BIO *bio); /* Private functions */ #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 #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 /* 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 struct bio_method_st { int type; const char *name; int (*bwrite)(BIO *, const char *, int); int (*bread)(BIO *, char *, int); /* TODO(fork): remove bputs. */ int (*bputs)(BIO *, const char *); int (*bgets)(BIO *, char *, int); long (*ctrl)(BIO *, int, long, void *); int (*create)(BIO *); int (*destroy)(BIO *); long (*callback_ctrl)(BIO *, int, bio_info_cb); }; struct bio_st { const BIO_METHOD *method; /* bio, mode, argp, argi, argl, ret */ long (*callback)(BIO *, int, const char *, int, long, long); char *cb_arg; /* first argument for the callback */ /* init is non-zero if this |BIO| has been initialised. */ int init; /* shutdown is often used by specific |BIO_METHOD|s to determine whether * they own some underlying resource. This flag can often by controlled by * |BIO_set_close|. For example, whether an fd BIO closes the underlying fd * when it, itself, is closed. */ int shutdown; int flags; int retry_reason; /* num is a BIO-specific value. For example, in fd BIOs it's used to store a * file descriptor. */ int num; CRYPTO_refcount_t references; void *ptr; /* next_bio points to the next |BIO| in a chain. This |BIO| owns a reference * to |next_bio|. */ BIO *next_bio; /* used by filter BIOs */ size_t num_read, num_write; }; #define BIO_C_SET_CONNECT 100 #define BIO_C_DO_STATE_MACHINE 101 #define BIO_C_SET_NBIO 102 #define BIO_C_SET_PROXY_PARAM 103 #define BIO_C_SET_FD 104 #define BIO_C_GET_FD 105 #define BIO_C_SET_FILE_PTR 106 #define BIO_C_GET_FILE_PTR 107 #define BIO_C_SET_FILENAME 108 #define BIO_C_SET_SSL 109 #define BIO_C_GET_SSL 110 #define BIO_C_SET_MD 111 #define BIO_C_GET_MD 112 #define BIO_C_GET_CIPHER_STATUS 113 #define BIO_C_SET_BUF_MEM 114 #define BIO_C_GET_BUF_MEM_PTR 115 #define BIO_C_GET_BUFF_NUM_LINES 116 #define BIO_C_SET_BUFF_SIZE 117 #define BIO_C_SET_ACCEPT 118 #define BIO_C_SSL_MODE 119 #define BIO_C_GET_MD_CTX 120 #define BIO_C_GET_PROXY_PARAM 121 #define BIO_C_SET_BUFF_READ_DATA 122 /* data to read first */ #define BIO_C_GET_ACCEPT 124 #define BIO_C_SET_SSL_RENEGOTIATE_BYTES 125 #define BIO_C_GET_SSL_NUM_RENEGOTIATES 126 #define BIO_C_SET_SSL_RENEGOTIATE_TIMEOUT 127 #define BIO_C_FILE_SEEK 128 #define BIO_C_GET_CIPHER_CTX 129 #define BIO_C_SET_BUF_MEM_EOF_RETURN 130/*return end of input value*/ #define BIO_C_SET_BIND_MODE 131 #define BIO_C_GET_BIND_MODE 132 #define BIO_C_FILE_TELL 133 #define BIO_C_GET_SOCKS 134 #define BIO_C_SET_SOCKS 135 #define BIO_C_SET_WRITE_BUF_SIZE 136/* for BIO_s_bio */ #define BIO_C_GET_WRITE_BUF_SIZE 137 #define BIO_C_GET_WRITE_GUARANTEE 140 #define BIO_C_GET_READ_REQUEST 141 #define BIO_C_SHUTDOWN_WR 142 #define BIO_C_NREAD0 143 #define BIO_C_NREAD 144 #define BIO_C_NWRITE0 145 #define BIO_C_NWRITE 146 #define BIO_C_RESET_READ_REQUEST 147 #define BIO_C_SET_MD_CTX 148 #define BIO_C_SET_PREFIX 149 #define BIO_C_GET_PREFIX 150 #define BIO_C_SET_SUFFIX 151 #define BIO_C_GET_SUFFIX 152 #define BIO_C_SET_EX_ARG 153 #define BIO_C_GET_EX_ARG 154 #if defined(__cplusplus) } /* extern C */ #endif #define BIO_R_BAD_FOPEN_MODE 100 #define BIO_R_BROKEN_PIPE 101 #define BIO_R_CONNECT_ERROR 102 #define BIO_R_ERROR_SETTING_NBIO 103 #define BIO_R_INVALID_ARGUMENT 104 #define BIO_R_IN_USE 105 #define BIO_R_KEEPALIVE 106 #define BIO_R_NBIO_CONNECT_ERROR 107 #define BIO_R_NO_HOSTNAME_SPECIFIED 108 #define BIO_R_NO_PORT_SPECIFIED 109 #define BIO_R_NO_SUCH_FILE 110 #define BIO_R_NULL_PARAMETER 111 #define BIO_R_SYS_LIB 112 #define BIO_R_UNABLE_TO_CREATE_SOCKET 113 #define BIO_R_UNINITIALIZED 114 #define BIO_R_UNSUPPORTED_METHOD 115 #define BIO_R_WRITE_TO_READ_ONLY_BIO 116 #endif /* OPENSSL_HEADER_BIO_H */