crypto/bio/bss_sock.c

   1 /*
   2  * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include <errno.h>
  12 #define USE_SOCKETS
  13 #include "bio_lcl.h"
  14 #include "internal/cryptlib.h"
  15
  16 #ifndef OPENSSL_NO_SOCK
  17
  18 # include <openssl/bio.h>
  19
  20 # ifdef WATT32
  21 /* Watt-32 uses same names */
  22 #  undef sock_write
  23 #  undef sock_read
  24 #  undef sock_puts
  25 #  define sock_write SockWrite
  26 #  define sock_read  SockRead
  27 #  define sock_puts  SockPuts
  28 # endif
  29
  30 static int sock_write(BIO *h, const char *buf, int num);
  31 static int sock_read(BIO *h, char *buf, int size);
  32 static int sock_puts(BIO *h, const char *str);
  33 static long sock_ctrl(BIO *h, int cmd, long arg1, void *arg2);
  34 static int sock_new(BIO *h);
  35 static int sock_free(BIO *data);
  36 int BIO_sock_should_retry(int s);
  37
  38 static const BIO_METHOD methods_sockp = {
  39     BIO_TYPE_SOCKET,
  40     "socket",
  41     sock_write,
  42     /* TODO: Convert to new style read function */
  43     bread_conv,
  44     sock_read,
  45     sock_puts,
  46     NULL,                       /* sock_gets, */
  47     sock_ctrl,
  48     sock_new,
  49     sock_free,
  50     NULL,
  51 };
  52
  53 const BIO_METHOD *BIO_s_socket(void)
  54 {
  55     return (&methods_sockp);
  56 }
  57
  58 BIO *BIO_new_socket(int fd, int close_flag)
  59 {
  60     BIO *ret;
  61
  62     ret = BIO_new(BIO_s_socket());
  63     if (ret == NULL)
  64         return (NULL);
  65     BIO_set_fd(ret, fd, close_flag);
  66     return (ret);
  67 }
  68
  69 static int sock_new(BIO *bi)
  70 {
  71     bi->init = 0;
  72     bi->num = 0;
  73     bi->ptr = NULL;
  74     bi->flags = 0;
  75     return (1);
  76 }
  77
  78 static int sock_free(BIO *a)
  79 {
  80     if (a == NULL)
  81         return (0);
  82     if (a->shutdown) {
  83         if (a->init) {
  84             BIO_closesocket(a->num);
  85         }
  86         a->init = 0;
  87         a->flags = 0;
  88     }
  89     return (1);
  90 }
  91
  92 static int sock_read(BIO *b, char *out, int outl)
  93 {
  94     int ret = 0;
  95
  96     if (out != NULL) {
  97         clear_socket_error();
  98         ret = readsocket(b->num, out, outl);
  99         BIO_clear_retry_flags(b);
 100         if (ret <= 0) {
 101             if (BIO_sock_should_retry(ret))
 102                 BIO_set_retry_read(b);
 103         }
 104     }
 105     return (ret);
 106 }
 107
 108 static int sock_write(BIO *b, const char *in, int inl)
 109 {
 110     int ret;
 111
 112     clear_socket_error();
 113     ret = writesocket(b->num, in, inl);
 114     BIO_clear_retry_flags(b);
 115     if (ret <= 0) {
 116         if (BIO_sock_should_retry(ret))
 117             BIO_set_retry_write(b);
 118     }
 119     return (ret);
 120 }
 121
 122 static long sock_ctrl(BIO *b, int cmd, long num, void *ptr)
 123 {
 124     long ret = 1;
 125     int *ip;
 126
 127     switch (cmd) {
 128     case BIO_C_SET_FD:
 129         sock_free(b);
 130         b->num = *((int *)ptr);
 131         b->shutdown = (int)num;
 132         b->init = 1;
 133         break;
 134     case BIO_C_GET_FD:
 135         if (b->init) {
 136             ip = (int *)ptr;
 137             if (ip != NULL)
 138                 *ip = b->num;
 139             ret = b->num;
 140         } else
 141             ret = -1;
 142         break;
 143     case BIO_CTRL_GET_CLOSE:
 144         ret = b->shutdown;
 145         break;
 146     case BIO_CTRL_SET_CLOSE:
 147         b->shutdown = (int)num;
 148         break;
 149     case BIO_CTRL_DUP:
 150     case BIO_CTRL_FLUSH:
 151         ret = 1;
 152         break;
 153     default:
 154         ret = 0;
 155         break;
 156     }
 157     return (ret);
 158 }
 159
 160 static int sock_puts(BIO *bp, const char *str)
 161 {
 162     int n, ret;
 163
 164     n = strlen(str);
 165     ret = sock_write(bp, str, n);
 166     return (ret);
 167 }
 168
 169 int BIO_sock_should_retry(int i)
 170 {
 171     int err;
 172
 173     if ((i == 0) || (i == -1)) {
 174         err = get_last_socket_error();
 175
 176         return (BIO_sock_non_fatal_error(err));
 177     }
 178     return (0);
 179 }
 180
 181 int BIO_sock_non_fatal_error(int err)
 182 {
 183     switch (err) {
 184 # if defined(OPENSSL_SYS_WINDOWS)
 185 #  if defined(WSAEWOULDBLOCK)
 186     case WSAEWOULDBLOCK:
 187 #  endif
 188 # endif
 189
 190 # ifdef EWOULDBLOCK
 191 #  ifdef WSAEWOULDBLOCK
 192 #   if WSAEWOULDBLOCK != EWOULDBLOCK
 193     case EWOULDBLOCK:
 194 #   endif
 195 #  else
 196     case EWOULDBLOCK:
 197 #  endif
 198 # endif
 199
 200 # if defined(ENOTCONN)
 201     case ENOTCONN:
 202 # endif
 203
 204 # ifdef EINTR
 205     case EINTR:
 206 # endif
 207
 208 # ifdef EAGAIN
 209 #  if EWOULDBLOCK != EAGAIN
 210     case EAGAIN:
 211 #  endif
 212 # endif
 213
 214 # ifdef EPROTO
 215     case EPROTO:
 216 # endif
 217
 218 # ifdef EINPROGRESS
 219     case EINPROGRESS:
 220 # endif
 221
 222 # ifdef EALREADY
 223     case EALREADY:
 224 # endif
 225         return (1);
 226         /* break; */
 227     default:
 228         break;
 229     }
 230     return (0);
 231 }
 232
 233 #endif                          /* #ifndef OPENSSL_NO_SOCK */