src/third_party/openssl/openssl/crypto/bio/bss_fd.c - cobalt - Git at Google

 /* crypto/bio/bss_fd.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"

 #if defined(OPENSSL_NO_POSIX_IO)
 /*
  * One can argue that one should implement dummy placeholder for
  * BIO_s_fd here...
  */
 #else
 /*
  * As for unconditional usage of "UPLINK" interface in this module.
  * Trouble is that unlike Unix file descriptors [which are indexes
  * in kernel-side per-process table], corresponding descriptors on
  * platforms which require "UPLINK" interface seem to be indexes
  * in a user-land, non-global table. Well, in fact they are indexes
  * in stdio _iob[], and recall that _iob[] was the very reason why
  * "UPLINK" interface was introduced in first place. But one way on
  * another. Neither libcrypto or libssl use this BIO meaning that
  * file descriptors can only be provided by application. Therefore
  * "UPLINK" calls are due...
  */
 # include "bio_lcl.h"

 static int fd_write(BIO *h, const char *buf, int num);
 static int fd_read(BIO *h, char *buf, int size);
 static int fd_puts(BIO *h, const char *str);
 static int fd_gets(BIO *h, char *buf, int size);
 static long fd_ctrl(BIO *h, int cmd, long arg1, void *arg2);
 static int fd_new(BIO *h);
 static int fd_free(BIO *data);
 int BIO_fd_should_retry(int s);

 static BIO_METHOD methods_fdp = {
     BIO_TYPE_FD, "file descriptor",
     fd_write,
     fd_read,
     fd_puts,
     fd_gets,
     fd_ctrl,
     fd_new,
     fd_free,
     NULL,
 };

 BIO_METHOD *BIO_s_fd(void)
 {
     return (&methods_fdp);
 }

 BIO *BIO_new_fd(int fd, int close_flag)
 {
     BIO *ret;
     ret = BIO_new(BIO_s_fd());
     if (ret == NULL)
         return (NULL);
     BIO_set_fd(ret, fd, close_flag);
     return (ret);
 }

 static int fd_new(BIO *bi)
 {
     bi->init = 0;
     bi->num = -1;
     bi->ptr = NULL;
     bi->flags = BIO_FLAGS_UPLINK; /* essentially redundant */
     return (1);
 }

 static int fd_free(BIO *a)
 {
     if (a == NULL)
         return (0);
     if (a->shutdown) {
         if (a->init) {
             UP_close(a->num);
         }
         a->init = 0;
         a->flags = BIO_FLAGS_UPLINK;
     }
     return (1);
 }

 static int fd_read(BIO *b, char *out, int outl)
 {
     int ret = 0;

     if (out != NULL) {
         clear_sys_error();
         ret = UP_read(b->num, out, outl);
         BIO_clear_retry_flags(b);
         if (ret <= 0) {
             if (BIO_fd_should_retry(ret))
                 BIO_set_retry_read(b);
         }
     }
     return (ret);
 }

 static int fd_write(BIO *b, const char *in, int inl)
 {
     int ret;
     clear_sys_error();
     ret = UP_write(b->num, in, inl);
     BIO_clear_retry_flags(b);
     if (ret <= 0) {
         if (BIO_fd_should_retry(ret))
             BIO_set_retry_write(b);
     }
     return (ret);
 }

 static long fd_ctrl(BIO *b, int cmd, long num, void *ptr)
 {
     long ret = 1;
     int *ip;

     switch (cmd) {
     case BIO_CTRL_RESET:
         num = 0;
     case BIO_C_FILE_SEEK:
         ret = (long)UP_lseek(b->num, num, 0);
         break;
     case BIO_C_FILE_TELL:
     case BIO_CTRL_INFO:
         ret = (long)UP_lseek(b->num, 0, 1);
         break;
     case BIO_C_SET_FD:
         fd_free(b);
         b->num = *((int *)ptr);
         b->shutdown = (int)num;
         b->init = 1;
         break;
     case BIO_C_GET_FD:
         if (b->init) {
             ip = (int *)ptr;
             if (ip != NULL)
                 *ip = b->num;
             ret = b->num;
         } 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_DUP:
     case BIO_CTRL_FLUSH:
         ret = 1;
         break;
     default:
         ret = 0;
         break;
     }
     return (ret);
 }

 static int fd_puts(BIO *bp, const char *str)
 {
     int n, ret;

     n = strlen(str);
     ret = fd_write(bp, str, n);
     return (ret);
 }

 static int fd_gets(BIO *bp, char *buf, int size)
 {
     int ret = 0;
     char *ptr = buf;
     char *end = buf + size - 1;

     while ((ptr < end) && (fd_read(bp, ptr, 1) > 0) && (ptr[0] != '\n'))
         ptr++;

     ptr[0] = '\0';

     if (buf[0] != '\0')
         ret = strlen(buf);
     return (ret);
 }

 int BIO_fd_should_retry(int i)
 {
     int err;

     if ((i == 0) || (i == -1)) {
         err = get_last_sys_error();

 # if defined(OPENSSL_SYS_WINDOWS) && 0/* more microsoft stupidity? perhaps
                                        * not? Ben 4/1/99 */
         if ((i == -1) && (err == 0))
             return (1);
 # endif

         return (BIO_fd_non_fatal_error(err));
     }
     return (0);
 }

 int BIO_fd_non_fatal_error(int err)
 {
     switch (err) {

 # ifdef EWOULDBLOCK
 #  ifdef WSAEWOULDBLOCK
 #   if WSAEWOULDBLOCK != EWOULDBLOCK
     case EWOULDBLOCK:
 #   endif
 #  else
     case EWOULDBLOCK:
 #  endif
 # endif

 # if defined(ENOTCONN)
     case ENOTCONN:
 # endif

 # ifdef EINTR
     case EINTR:
 # endif

 # ifdef EAGAIN
 #  if EWOULDBLOCK != EAGAIN
     case EAGAIN:
 #  endif
 # endif

 # ifdef EPROTO
     case EPROTO:
 # endif

 # ifdef EINPROGRESS
     case EINPROGRESS:
 # endif

 # ifdef EALREADY
     case EALREADY:
 # endif
         return (1);
         /* break; */
     default:
         break;
     }
     return (0);
 }
 #endif
	/* crypto/bio/bss_fd.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"

	#if defined(OPENSSL_NO_POSIX_IO)
	/*
	* One can argue that one should implement dummy placeholder for
	* BIO_s_fd here...
	*/
	#else
	/*
	* As for unconditional usage of "UPLINK" interface in this module.
	* Trouble is that unlike Unix file descriptors [which are indexes
	* in kernel-side per-process table], corresponding descriptors on
	* platforms which require "UPLINK" interface seem to be indexes
	* in a user-land, non-global table. Well, in fact they are indexes
	* in stdio _iob[], and recall that _iob[] was the very reason why
	* "UPLINK" interface was introduced in first place. But one way on
	* another. Neither libcrypto or libssl use this BIO meaning that
	* file descriptors can only be provided by application. Therefore
	* "UPLINK" calls are due...
	*/
	# include "bio_lcl.h"

	static int fd_write(BIO h, const char buf, int num);
	static int fd_read(BIO h, char buf, int size);
	static int fd_puts(BIO h, const char str);
	static int fd_gets(BIO h, char buf, int size);
	static long fd_ctrl(BIO h, int cmd, long arg1, void arg2);
	static int fd_new(BIO *h);
	static int fd_free(BIO *data);
	int BIO_fd_should_retry(int s);

	static BIO_METHOD methods_fdp = {
	BIO_TYPE_FD, "file descriptor",
	fd_write,
	fd_read,
	fd_puts,
	fd_gets,
	fd_ctrl,
	fd_new,
	fd_free,
	NULL,
	};

	BIO_METHOD *BIO_s_fd(void)
	{
	return (&methods_fdp);
	}

	BIO *BIO_new_fd(int fd, int close_flag)
	{
	BIO *ret;
	ret = BIO_new(BIO_s_fd());
	if (ret == NULL)
	return (NULL);
	BIO_set_fd(ret, fd, close_flag);
	return (ret);
	}

	static int fd_new(BIO *bi)
	{
	bi->init = 0;
	bi->num = -1;
	bi->ptr = NULL;
	bi->flags = BIO_FLAGS_UPLINK; /* essentially redundant */
	return (1);
	}

	static int fd_free(BIO *a)
	{
	if (a == NULL)
	return (0);
	if (a->shutdown) {
	if (a->init) {
	UP_close(a->num);
	}
	a->init = 0;
	a->flags = BIO_FLAGS_UPLINK;
	}
	return (1);
	}

	static int fd_read(BIO b, char out, int outl)
	{
	int ret = 0;

	if (out != NULL) {
	clear_sys_error();
	ret = UP_read(b->num, out, outl);
	BIO_clear_retry_flags(b);
	if (ret <= 0) {
	if (BIO_fd_should_retry(ret))
	BIO_set_retry_read(b);
	}
	}
	return (ret);
	}

	static int fd_write(BIO b, const char in, int inl)
	{
	int ret;
	clear_sys_error();
	ret = UP_write(b->num, in, inl);
	BIO_clear_retry_flags(b);
	if (ret <= 0) {
	if (BIO_fd_should_retry(ret))
	BIO_set_retry_write(b);
	}
	return (ret);
	}

	static long fd_ctrl(BIO b, int cmd, long num, void ptr)
	{
	long ret = 1;
	int *ip;

	switch (cmd) {
	case BIO_CTRL_RESET:
	num = 0;
	case BIO_C_FILE_SEEK:
	ret = (long)UP_lseek(b->num, num, 0);
	break;
	case BIO_C_FILE_TELL:
	case BIO_CTRL_INFO:
	ret = (long)UP_lseek(b->num, 0, 1);
	break;
	case BIO_C_SET_FD:
	fd_free(b);
	b->num = ((int )ptr);
	b->shutdown = (int)num;
	b->init = 1;
	break;
	case BIO_C_GET_FD:
	if (b->init) {
	ip = (int *)ptr;
	if (ip != NULL)
	*ip = b->num;
	ret = b->num;
	} 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_DUP:
	case BIO_CTRL_FLUSH:
	ret = 1;
	break;
	default:
	ret = 0;
	break;
	}
	return (ret);
	}

	static int fd_puts(BIO bp, const char str)
	{
	int n, ret;

	n = strlen(str);
	ret = fd_write(bp, str, n);
	return (ret);
	}

	static int fd_gets(BIO bp, char buf, int size)
	{
	int ret = 0;
	char *ptr = buf;
	char *end = buf + size - 1;

	while ((ptr < end) && (fd_read(bp, ptr, 1) > 0) && (ptr[0] != '\n'))
	ptr++;

	ptr[0] = '\0';

	if (buf[0] != '\0')
	ret = strlen(buf);
	return (ret);
	}

	int BIO_fd_should_retry(int i)
	{
	int err;

	if ((i == 0) \|\| (i == -1)) {
	err = get_last_sys_error();

	# if defined(OPENSSL_SYS_WINDOWS) && 0/* more microsoft stupidity? perhaps
	* not? Ben 4/1/99 */
	if ((i == -1) && (err == 0))
	return (1);
	# endif

	return (BIO_fd_non_fatal_error(err));
	}
	return (0);
	}

	int BIO_fd_non_fatal_error(int err)
	{
	switch (err) {

	# ifdef EWOULDBLOCK
	# ifdef WSAEWOULDBLOCK
	# if WSAEWOULDBLOCK != EWOULDBLOCK
	case EWOULDBLOCK:
	# endif
	# else
	case EWOULDBLOCK:
	# endif
	# endif

	# if defined(ENOTCONN)
	case ENOTCONN:
	# endif

	# ifdef EINTR
	case EINTR:
	# endif

	# ifdef EAGAIN
	# if EWOULDBLOCK != EAGAIN
	case EAGAIN:
	# endif
	# endif

	# ifdef EPROTO
	case EPROTO:
	# endif

	# ifdef EINPROGRESS
	case EINPROGRESS:
	# endif

	# ifdef EALREADY
	case EALREADY:
	# endif
	return (1);
	/* break; */
	default:
	break;
	}
	return (0);
	}
	#endif