crypto/bio/b_sock2.c

   1 /* ====================================================================
   2  * Copyright (c) 2015 The OpenSSL Project.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  *
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in
  13  *    the documentation and/or other materials provided with the
  14  *    distribution.
  15  *
  16  * 3. All advertising materials mentioning features or use of this
  17  *    software must display the following acknowledgment:
  18  *    "This product includes software developed by the OpenSSL Project
  19  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  20  *
  21  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  22  *    endorse or promote products derived from this software without
  23  *    prior written permission. For written permission, please contact
  24  *    openssl-core@openssl.org.
  25  *
  26  * 5. Products derived from this software may not be called "OpenSSL"
  27  *    nor may "OpenSSL" appear in their names without prior written
  28  *    permission of the OpenSSL Project.
  29  *
  30  * 6. Redistributions of any form whatsoever must retain the following
  31  *    acknowledgment:
  32  *    "This product includes software developed by the OpenSSL Project
  33  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  34  *
  35  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  36  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  37  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  38  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  39  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  40  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  41  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  42  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  43  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  44  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  45  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  46  * OF THE POSSIBILITY OF SUCH DAMAGE.
  47  * ====================================================================
  48  *
  49  * This product includes cryptographic software written by Eric Young
  50  * (eay@cryptsoft.com).  This product includes software written by Tim
  51  * Hudson (tjh@cryptsoft.com).
  52  *
  53  */
  54
  55 #include <stdio.h>
  56 #include <stdlib.h>
  57 #include <errno.h>
  58
  59 #include "bio_lcl.h"
  60
  61 #include <openssl/err.h>
  62
  63 #ifndef OPENSSL_NO_SOCK
  64 # ifdef SO_MAXCONN
  65 #  define MAX_LISTEN  SO_MAXCONN
  66 # elif defined(SOMAXCONN)
  67 #  define MAX_LISTEN  SOMAXCONN
  68 # else
  69 #  define MAX_LISTEN  32
  70 # endif
  71
  72 /*-
  73  * BIO_socket - create a socket
  74  * @domain: the socket domain (AF_INET, AF_INET6, AF_UNIX, ...)
  75  * @socktype: the socket type (SOCK_STEAM, SOCK_DGRAM)
  76  * @protocol: the protocol to use (IPPROTO_TCP, IPPROTO_UDP)
  77  * @options: BIO socket options (currently unused)
  78  *
  79  * Creates a socket.  This should be called before calling any
  80  * of BIO_connect and BIO_listen.
  81  *
  82  * Returns the file descriptor on success or INVALID_SOCKET on failure.  On
  83  * failure errno is set, and a status is added to the OpenSSL error stack.
  84  */
  85 int BIO_socket(int domain, int socktype, int protocol, int options)
  86 {
  87     int sock = -1;
  88
  89     if (BIO_sock_init() != 1)
  90         return INVALID_SOCKET;
  91
  92     sock = socket(domain, socktype, protocol);
  93     if (sock == -1) {
  94         SYSerr(SYS_F_SOCKET, get_last_socket_error());
  95         BIOerr(BIO_F_BIO_SOCKET, BIO_R_UNABLE_TO_CREATE_SOCKET);
  96         return INVALID_SOCKET;
  97     }
  98
  99     return sock;
 100 }
 101
 102 /*-
 103  * BIO_connect - connect to an address
 104  * @sock: the socket to connect with
 105  * @addr: the address to connect to
 106  * @options: BIO socket options
 107  *
 108  * Connects to the address using the given socket and options.
 109  *
 110  * Options can be a combination of the following:
 111  * - BIO_SOCK_KEEPALIVE: enable regularly sending keep-alive messages.
 112  * - BIO_SOCK_NONBLOCK: Make the socket non-blocking.
 113  * - BIO_SOCK_NODELAY: don't delay small messages.
 114  *
 115  * options holds BIO socket options that can be used
 116  * You should call this for every address returned by BIO_lookup
 117  * until the connection is succesful.
 118  *
 119  * Returns 1 on success or 0 on failure.  On failure errno is set
 120  * and an error status is added to the OpenSSL error stack.
 121  */
 122 int BIO_connect(int sock, const BIO_ADDR *addr, int options)
 123 {
 124     int on = 1;
 125
 126     if (sock == -1) {
 127         BIOerr(BIO_F_BIO_CONNECT, BIO_R_INVALID_SOCKET);
 128         return 0;
 129     }
 130
 131     if (!BIO_socket_nbio(sock, (options & BIO_SOCK_NONBLOCK) != 0))
 132         return 0;
 133
 134     if (options & BIO_SOCK_KEEPALIVE) {
 135         if (setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof(on)) != 0) {
 136             SYSerr(SYS_F_SETSOCKOPT, get_last_socket_error());
 137             BIOerr(BIO_F_BIO_CONNECT, BIO_R_UNABLE_TO_KEEPALIVE);
 138             return 0;
 139         }
 140     }
 141
 142     if (options & BIO_SOCK_NODELAY) {
 143         if (setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) != 0) {
 144             SYSerr(SYS_F_SETSOCKOPT, get_last_socket_error());
 145             BIOerr(BIO_F_BIO_CONNECT, BIO_R_UNABLE_TO_NODELAY);
 146             return 0;
 147         }
 148     }
 149
 150     if (connect(sock, BIO_ADDR_sockaddr(addr),
 151                 BIO_ADDR_sockaddr_size(addr)) == -1) {
 152         SYSerr(SYS_F_CONNECT, get_last_socket_error());
 153         BIOerr(BIO_F_BIO_CONNECT, BIO_R_CONNECT_ERROR);
 154         return 0;
 155     }
 156     return 1;
 157 }
 158
 159 /*-
 160  * BIO_listen - Creates a listen socket
 161  * @sock: the socket to listen with
 162  * @addr: local address to bind to
 163  * @options: BIO socket options
 164  *
 165  * Binds to the address using the given socket and options, then
 166  * starts listening for incoming connections.
 167  *
 168  * Options can be a combination of the following:
 169  * - BIO_SOCK_KEEPALIVE: enable regularly sending keep-alive messages.
 170  * - BIO_SOCK_NONBLOCK: Make the socket non-blocking.
 171  * - BIO_SOCK_NODELAY: don't delay small messages.
 172  * - BIO_SOCK_REUSEADDR: Try to reuse the address and port combination
 173  *   for a recently closed port.
 174  * - BIO_SOCK_V6_ONLY: When creating an IPv6 socket, make it listen only
 175  *   for IPv6 addresses and not IPv4 addresses mapped to IPv6.
 176  *
 177  * It's recommended that you set up both an IPv6 and IPv4 listen socket, and
 178  * then check both for new clients that connect to it.  You want to set up
 179  * the socket as non-blocking in that case since else it could hang.
 180  *
 181  * Not all operating systems support IPv4 addresses on an IPv6 socket, and for
 182  * others it's an option.  If you pass the BIO_LISTEN_V6_ONLY it will try to
 183  * create the IPv6 sockets to only listen for IPv6 connection.
 184  *
 185  * It could be that the first BIO_listen() call will listen to all the IPv6
 186  * and IPv4 addresses and that then trying to bind to the IPv4 address will
 187  * fail.  We can't tell the difference between already listening ourself to
 188  * it and someone else listening to it when failing and errno is EADDRINUSE, so
 189  * it's recommended to not give an error in that case if the first call was
 190  * succesful.
 191  *
 192  * When restarting the program it could be that the port is still in use.  If
 193  * you set to BIO_SOCK_REUSEADDR option it will try to reuse the port anyway.
 194  * It's recommended that you use this.
 195  */
 196 int BIO_listen(int sock, const BIO_ADDR *addr, int options)
 197 {
 198     int on = 1;
 199     int socktype;
 200     socklen_t socktype_len = sizeof(socktype);
 201
 202     if (sock == -1) {
 203         BIOerr(BIO_F_BIO_LISTEN, BIO_R_INVALID_SOCKET);
 204         return 0;
 205     }
 206
 207     if (getsockopt(sock, SOL_SOCKET, SO_TYPE, &socktype, &socktype_len) != 0
 208         || socktype_len != sizeof(socktype)) {
 209         SYSerr(SYS_F_GETSOCKOPT, get_last_socket_error());
 210         BIOerr(BIO_F_BIO_LISTEN, BIO_R_GETTING_SOCKTYPE);
 211         return 0;
 212     }
 213
 214     if (!BIO_socket_nbio(sock, (options & BIO_SOCK_NONBLOCK) != 0))
 215         return 0;
 216
 217 # ifndef OPENSSL_SYS_WINDOWS
 218     /* SO_REUSEADDR has different behavior on Windows than on
 219      * other operating systems, don't set it there. */
 220     if (options & BIO_SOCK_REUSEADDR) {
 221         if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) != 0) {
 222             SYSerr(SYS_F_SETSOCKOPT, get_last_socket_error());
 223             BIOerr(BIO_F_BIO_LISTEN, BIO_R_UNABLE_TO_REUSEADDR);
 224             return 0;
 225         }
 226     }
 227 # endif
 228
 229     if (options & BIO_SOCK_KEEPALIVE) {
 230         if (setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof(on)) != 0) {
 231             SYSerr(SYS_F_SETSOCKOPT, get_last_socket_error());
 232             BIOerr(BIO_F_BIO_LISTEN, BIO_R_UNABLE_TO_KEEPALIVE);
 233             return 0;
 234         }
 235     }
 236
 237     if (options & BIO_SOCK_NODELAY) {
 238         if (setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) != 0) {
 239             SYSerr(SYS_F_SETSOCKOPT, get_last_socket_error());
 240             BIOerr(BIO_F_BIO_LISTEN, BIO_R_UNABLE_TO_NODELAY);
 241             return 0;
 242         }
 243     }
 244
 245 # ifdef IPV6_V6ONLY
 246     if ((options & BIO_SOCK_V6_ONLY) && BIO_ADDR_family(addr) == AF_INET6) {
 247         if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) != 0) {
 248             SYSerr(SYS_F_SETSOCKOPT, get_last_socket_error());
 249             BIOerr(BIO_F_BIO_LISTEN, BIO_R_LISTEN_V6_ONLY);
 250             return 0;
 251         }
 252     }
 253 # endif
 254
 255     if (bind(sock, BIO_ADDR_sockaddr(addr), BIO_ADDR_sockaddr_size(addr)) != 0) {
 256         SYSerr(SYS_F_BIND, get_last_socket_error());
 257         BIOerr(BIO_F_BIO_LISTEN, BIO_R_UNABLE_TO_BIND_SOCKET);
 258         return 0;
 259     }
 260
 261     if (socktype != SOCK_DGRAM && listen(sock, MAX_LISTEN) == -1) {
 262         SYSerr(SYS_F_LISTEN, get_last_socket_error());
 263         BIOerr(BIO_F_BIO_LISTEN, BIO_R_UNABLE_TO_LISTEN_SOCKET);
 264         return 0;
 265     }
 266
 267     return 1;
 268 }
 269
 270 /*-
 271  * BIO_accept_ex - Accept new incoming connections
 272  * @sock: the listening socket
 273  * @addr: the BIO_ADDR to store the peer address in
 274  * @options: BIO socket options, applied on the accepted socket.
 275  *
 276  */
 277 int BIO_accept_ex(int accept_sock, BIO_ADDR *addr, int options)
 278 {
 279     socklen_t len;
 280     int accepted_sock;
 281
 282     len = sizeof(*addr);
 283     accepted_sock = accept(accept_sock,
 284                            BIO_ADDR_sockaddr_noconst(addr), &len);
 285     if (accepted_sock == -1) {
 286         SYSerr(SYS_F_ACCEPT, get_last_socket_error());
 287         BIOerr(BIO_F_BIO_ACCEPT_EX, BIO_R_ACCEPT_ERROR);
 288         return INVALID_SOCKET;
 289     }
 290
 291     if (!BIO_socket_nbio(accepted_sock, (options & BIO_SOCK_NONBLOCK) != 0))
 292         return INVALID_SOCKET;
 293
 294     return accepted_sock;
 295 }
 296
 297 /*-
 298  * BIO_closesocket - Close a socket
 299  * @sock: the socket to close
 300  */
 301 int BIO_closesocket(int sock)
 302 {
 303     if (closesocket(sock) < 0)
 304         return 0;
 305     return 1;
 306 }
 307 #endif