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      1 /* crypto/bio/bss_sock.c */
      2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com)
      3  * All rights reserved.
      4  *
      5  * This package is an SSL implementation written
      6  * by Eric Young (eay (at) cryptsoft.com).
      7  * The implementation was written so as to conform with Netscapes SSL.
      8  *
      9  * This library is free for commercial and non-commercial use as long as
     10  * the following conditions are aheared to.  The following conditions
     11  * apply to all code found in this distribution, be it the RC4, RSA,
     12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
     13  * included with this distribution is covered by the same copyright terms
     14  * except that the holder is Tim Hudson (tjh (at) cryptsoft.com).
     15  *
     16  * Copyright remains Eric Young's, and as such any Copyright notices in
     17  * the code are not to be removed.
     18  * If this package is used in a product, Eric Young should be given attribution
     19  * as the author of the parts of the library used.
     20  * This can be in the form of a textual message at program startup or
     21  * in documentation (online or textual) provided with the package.
     22  *
     23  * Redistribution and use in source and binary forms, with or without
     24  * modification, are permitted provided that the following conditions
     25  * are met:
     26  * 1. Redistributions of source code must retain the copyright
     27  *    notice, this list of conditions and the following disclaimer.
     28  * 2. Redistributions in binary form must reproduce the above copyright
     29  *    notice, this list of conditions and the following disclaimer in the
     30  *    documentation and/or other materials provided with the distribution.
     31  * 3. All advertising materials mentioning features or use of this software
     32  *    must display the following acknowledgement:
     33  *    "This product includes cryptographic software written by
     34  *     Eric Young (eay (at) cryptsoft.com)"
     35  *    The word 'cryptographic' can be left out if the rouines from the library
     36  *    being used are not cryptographic related :-).
     37  * 4. If you include any Windows specific code (or a derivative thereof) from
     38  *    the apps directory (application code) you must include an acknowledgement:
     39  *    "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)"
     40  *
     41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
     42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     51  * SUCH DAMAGE.
     52  *
     53  * The licence and distribution terms for any publically available version or
     54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
     55  * copied and put under another distribution licence
     56  * [including the GNU Public Licence.] */
     57 
     58 #include <openssl/bio.h>
     59 
     60 #include <fcntl.h>
     61 #include <string.h>
     62 
     63 #if !defined(OPENSSL_WINDOWS)
     64 #include <unistd.h>
     65 #else
     66 #pragma warning(push, 3)
     67 #include <winsock2.h>
     68 #pragma warning(pop)
     69 
     70 #pragma comment(lib, "Ws2_32.lib")
     71 #endif
     72 
     73 #include "internal.h"
     74 
     75 
     76 #if !defined(OPENSSL_WINDOWS)
     77 static int closesocket(int sock) {
     78   return close(sock);
     79 }
     80 #endif
     81 
     82 static int sock_new(BIO *bio) {
     83   bio->init = 0;
     84   bio->num = 0;
     85   bio->ptr = NULL;
     86   bio->flags = 0;
     87   return 1;
     88 }
     89 
     90 static int sock_free(BIO *bio) {
     91   if (bio == NULL) {
     92     return 0;
     93   }
     94 
     95   if (bio->shutdown) {
     96     if (bio->init) {
     97       closesocket(bio->num);
     98     }
     99     bio->init = 0;
    100     bio->flags = 0;
    101   }
    102   return 1;
    103 }
    104 
    105 static int sock_read(BIO *b, char *out, int outl) {
    106   int ret = 0;
    107 
    108   if (out == NULL) {
    109     return 0;
    110   }
    111 
    112   bio_clear_socket_error();
    113   ret = recv(b->num, out, outl, 0);
    114   BIO_clear_retry_flags(b);
    115   if (ret <= 0) {
    116     if (bio_fd_should_retry(ret)) {
    117       BIO_set_retry_read(b);
    118     }
    119   }
    120   return ret;
    121 }
    122 
    123 static int sock_write(BIO *b, const char *in, int inl) {
    124   int ret;
    125 
    126   bio_clear_socket_error();
    127   ret = send(b->num, in, inl, 0);
    128   BIO_clear_retry_flags(b);
    129   if (ret <= 0) {
    130     if (bio_fd_should_retry(ret)) {
    131       BIO_set_retry_write(b);
    132     }
    133   }
    134   return ret;
    135 }
    136 
    137 static int sock_puts(BIO *bp, const char *str) {
    138   return sock_write(bp, str, strlen(str));
    139 }
    140 
    141 static long sock_ctrl(BIO *b, int cmd, long num, void *ptr) {
    142   long ret = 1;
    143   int *ip;
    144 
    145   switch (cmd) {
    146     case BIO_C_SET_FD:
    147       sock_free(b);
    148       b->num = *((int *)ptr);
    149       b->shutdown = (int)num;
    150       b->init = 1;
    151       break;
    152     case BIO_C_GET_FD:
    153       if (b->init) {
    154         ip = (int *)ptr;
    155         if (ip != NULL) {
    156           *ip = b->num;
    157         }
    158         ret = b->num;
    159       } else {
    160         ret = -1;
    161       }
    162       break;
    163     case BIO_CTRL_GET_CLOSE:
    164       ret = b->shutdown;
    165       break;
    166     case BIO_CTRL_SET_CLOSE:
    167       b->shutdown = (int)num;
    168       break;
    169     case BIO_CTRL_FLUSH:
    170       ret = 1;
    171       break;
    172     default:
    173       ret = 0;
    174       break;
    175   }
    176   return ret;
    177 }
    178 
    179 static const BIO_METHOD methods_sockp = {
    180     BIO_TYPE_SOCKET,  "socket",  sock_write, sock_read, sock_puts,
    181     NULL /* gets, */, sock_ctrl, sock_new,   sock_free, NULL,
    182 };
    183 
    184 const BIO_METHOD *BIO_s_socket(void) { return &methods_sockp; }
    185 
    186 BIO *BIO_new_socket(int fd, int close_flag) {
    187   BIO *ret;
    188 
    189   ret = BIO_new(BIO_s_socket());
    190   if (ret == NULL) {
    191     return NULL;
    192   }
    193   BIO_set_fd(ret, fd, close_flag);
    194   return ret;
    195 }
    196