crypto/bio/bss_sock.c

   1 /*
   2  * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (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 #include "bio_local.h"
  13 #include "internal/cryptlib.h"
  14 #include "internal/ktls.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     /* TODO: Convert to new style write function */
  42     bwrite_conv,
  43     sock_write,
  44     /* TODO: Convert to new style read function */
  45     bread_conv,
  46     sock_read,
  47     sock_puts,
  48     NULL,                       /* sock_gets,         */
  49     sock_ctrl,
  50     sock_new,
  51     sock_free,
  52     NULL,                       /* sock_callback_ctrl */
  53 };
  54
  55 const BIO_METHOD *BIO_s_socket(void)
  56 {
  57     return &methods_sockp;
  58 }
  59
  60 BIO *BIO_new_socket(int fd, int close_flag)
  61 {
  62     BIO *ret;
  63
  64     ret = BIO_new(BIO_s_socket());
  65     if (ret == NULL)
  66         return NULL;
  67     BIO_set_fd(ret, fd, close_flag);
  68 # ifndef OPENSSL_NO_KTLS
  69     {
  70         /*
  71          * The new socket is created successfully regardless of ktls_enable.
  72          * ktls_enable doesn't change any functionality of the socket, except
  73          * changing the setsockopt to enable the processing of ktls_start.
  74          * Thus, it is not a problem to call it for non-TLS sockets.
  75          */
  76         ktls_enable(fd);
  77     }
  78 # endif
  79     return ret;
  80 }
  81
  82 static int sock_new(BIO *bi)
  83 {
  84     bi->init = 0;
  85     bi->num = 0;
  86     bi->ptr = NULL;
  87     bi->flags = 0;
  88     return 1;
  89 }
  90
  91 static int sock_free(BIO *a)
  92 {
  93     if (a == NULL)
  94         return 0;
  95     if (a->shutdown) {
  96         if (a->init) {
  97             BIO_closesocket(a->num);
  98         }
  99         a->init = 0;
 100         a->flags = 0;
 101     }
 102     return 1;
 103 }
 104
 105 static int sock_read(BIO *b, char *out, int outl)
 106 {
 107     int ret = 0;
 108
 109     if (out != NULL) {
 110         clear_socket_error();
 111 # ifndef OPENSSL_NO_KTLS
 112         if (BIO_get_ktls_recv(b))
 113             ret = ktls_read_record(b->num, out, outl);
 114         else
 115 # endif
 116             ret = readsocket(b->num, out, outl);
 117         BIO_clear_retry_flags(b);
 118         if (ret <= 0) {
 119             if (BIO_sock_should_retry(ret))
 120                 BIO_set_retry_read(b);
 121         }
 122     }
 123     return ret;
 124 }
 125
 126 static int sock_write(BIO *b, const char *in, int inl)
 127 {
 128     int ret = 0;
 129
 130     clear_socket_error();
 131 # ifndef OPENSSL_NO_KTLS
 132     if (BIO_should_ktls_ctrl_msg_flag(b)) {
 133         unsigned char record_type = (intptr_t)b->ptr;
 134         ret = ktls_send_ctrl_message(b->num, record_type, in, inl);
 135         if (ret >= 0) {
 136             ret = inl;
 137             BIO_clear_ktls_ctrl_msg_flag(b);
 138         }
 139     } else
 140 # endif
 141         ret = writesocket(b->num, in, inl);
 142     BIO_clear_retry_flags(b);
 143     if (ret <= 0) {
 144         if (BIO_sock_should_retry(ret))
 145             BIO_set_retry_write(b);
 146     }
 147     return ret;
 148 }
 149
 150 static long sock_ctrl(BIO *b, int cmd, long num, void *ptr)
 151 {
 152     long ret = 1;
 153     int *ip;
 154 # ifndef OPENSSL_NO_KTLS
 155     struct tls12_crypto_info_aes_gcm_128 *crypto_info;
 156 # endif
 157
 158     switch (cmd) {
 159     case BIO_C_SET_FD:
 160         sock_free(b);
 161         b->num = *((int *)ptr);
 162         b->shutdown = (int)num;
 163         b->init = 1;
 164         break;
 165     case BIO_C_GET_FD:
 166         if (b->init) {
 167             ip = (int *)ptr;
 168             if (ip != NULL)
 169                 *ip = b->num;
 170             ret = b->num;
 171         } else
 172             ret = -1;
 173         break;
 174     case BIO_CTRL_GET_CLOSE:
 175         ret = b->shutdown;
 176         break;
 177     case BIO_CTRL_SET_CLOSE:
 178         b->shutdown = (int)num;
 179         break;
 180     case BIO_CTRL_DUP:
 181     case BIO_CTRL_FLUSH:
 182         ret = 1;
 183         break;
 184 # ifndef OPENSSL_NO_KTLS
 185     case BIO_CTRL_SET_KTLS:
 186         crypto_info = (struct tls12_crypto_info_aes_gcm_128 *)ptr;
 187         ret = ktls_start(b->num, crypto_info, sizeof(*crypto_info), num);
 188         if (ret)
 189             BIO_set_ktls_flag(b, num);
 190         break;
 191     case BIO_CTRL_GET_KTLS_SEND:
 192         return BIO_should_ktls_flag(b, 1);
 193     case BIO_CTRL_GET_KTLS_RECV:
 194         return BIO_should_ktls_flag(b, 0);
 195     case BIO_CTRL_SET_KTLS_TX_SEND_CTRL_MSG:
 196         BIO_set_ktls_ctrl_msg_flag(b);
 197         b->ptr = (void *)num;
 198         ret = 0;
 199         break;
 200     case BIO_CTRL_CLEAR_KTLS_TX_CTRL_MSG:
 201         BIO_clear_ktls_ctrl_msg_flag(b);
 202         ret = 0;
 203         break;
 204 # endif
 205     default:
 206         ret = 0;
 207         break;
 208     }
 209     return ret;
 210 }
 211
 212 static int sock_puts(BIO *bp, const char *str)
 213 {
 214     int n, ret;
 215
 216     n = strlen(str);
 217     ret = sock_write(bp, str, n);
 218     return ret;
 219 }
 220
 221 int BIO_sock_should_retry(int i)
 222 {
 223     int err;
 224
 225     if ((i == 0) || (i == -1)) {
 226         err = get_last_socket_error();
 227
 228         return BIO_sock_non_fatal_error(err);
 229     }
 230     return 0;
 231 }
 232
 233 int BIO_sock_non_fatal_error(int err)
 234 {
 235     switch (err) {
 236 # if defined(OPENSSL_SYS_WINDOWS)
 237 #  if defined(WSAEWOULDBLOCK)
 238     case WSAEWOULDBLOCK:
 239 #  endif
 240 # endif
 241
 242 # ifdef EWOULDBLOCK
 243 #  ifdef WSAEWOULDBLOCK
 244 #   if WSAEWOULDBLOCK != EWOULDBLOCK
 245     case EWOULDBLOCK:
 246 #   endif
 247 #  else
 248     case EWOULDBLOCK:
 249 #  endif
 250 # endif
 251
 252 # if defined(ENOTCONN)
 253     case ENOTCONN:
 254 # endif
 255
 256 # ifdef EINTR
 257     case EINTR:
 258 # endif
 259
 260 # ifdef EAGAIN
 261 #  if EWOULDBLOCK != EAGAIN
 262     case EAGAIN:
 263 #  endif
 264 # endif
 265
 266 # ifdef EPROTO
 267     case EPROTO:
 268 # endif
 269
 270 # ifdef EINPROGRESS
 271     case EINPROGRESS:
 272 # endif
 273
 274 # ifdef EALREADY
 275     case EALREADY:
 276 # endif
 277         return 1;
 278     default:
 279         break;
 280     }
 281     return 0;
 282 }
 283
 284 #endif                          /* #ifndef OPENSSL_NO_SOCK */