309 lines
11 KiB
C
309 lines
11 KiB
C
/* ====================================================================
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* Copyright (c) 2015 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include "bio_lcl.h"
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#include <openssl/err.h>
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#ifndef OPENSSL_NO_SOCK
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# ifdef SO_MAXCONN
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# define MAX_LISTEN SO_MAXCONN
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# elif defined(SOMAXCONN)
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# define MAX_LISTEN SOMAXCONN
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# else
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# define MAX_LISTEN 32
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# endif
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/*-
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* BIO_socket - create a socket
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* @domain: the socket domain (AF_INET, AF_INET6, AF_UNIX, ...)
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* @socktype: the socket type (SOCK_STEAM, SOCK_DGRAM)
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* @protocol: the protocol to use (IPPROTO_TCP, IPPROTO_UDP)
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* @options: BIO socket options (currently unused)
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*
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* Creates a socket. This should be called before calling any
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* of BIO_connect and BIO_listen.
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*
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* Returns the file descriptor on success or INVALID_SOCKET on failure. On
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* failure errno is set, and a status is added to the OpenSSL error stack.
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*/
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int BIO_socket(int domain, int socktype, int protocol, int options)
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{
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int sock = -1;
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if (BIO_sock_init() != 1)
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return INVALID_SOCKET;
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sock = socket(domain, socktype, protocol);
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if (sock == -1) {
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SYSerr(SYS_F_SOCKET, get_last_socket_error());
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BIOerr(BIO_F_BIO_SOCKET, BIO_R_UNABLE_TO_CREATE_SOCKET);
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return INVALID_SOCKET;
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}
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return sock;
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}
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/*-
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* BIO_connect - connect to an address
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* @sock: the socket to connect with
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* @addr: the address to connect to
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* @options: BIO socket options
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*
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* Connects to the address using the given socket and options.
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*
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* Options can be a combination of the following:
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* - BIO_SOCK_KEEPALIVE: enable regularly sending keep-alive messages.
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* - BIO_SOCK_NONBLOCK: Make the socket non-blocking.
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* - BIO_SOCK_NODELAY: don't delay small messages.
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*
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* options holds BIO socket options that can be used
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* You should call this for every address returned by BIO_lookup
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* until the connection is succesful.
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*
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* Returns 1 on success or 0 on failure. On failure errno is set
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* and an error status is added to the OpenSSL error stack.
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*/
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int BIO_connect(int sock, const BIO_ADDR *addr, int options)
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{
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int on = 1;
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if (sock == -1) {
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BIOerr(BIO_F_BIO_CONNECT, BIO_R_INVALID_SOCKET);
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return 0;
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}
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if (!BIO_socket_nbio(sock, (options & BIO_SOCK_NONBLOCK) != 0))
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return 0;
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if (options & BIO_SOCK_KEEPALIVE) {
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if (setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof(on)) != 0) {
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SYSerr(SYS_F_SETSOCKOPT, get_last_socket_error());
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BIOerr(BIO_F_BIO_CONNECT, BIO_R_UNABLE_TO_KEEPALIVE);
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return 0;
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}
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}
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if (options & BIO_SOCK_NODELAY) {
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if (setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) != 0) {
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SYSerr(SYS_F_SETSOCKOPT, get_last_socket_error());
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BIOerr(BIO_F_BIO_CONNECT, BIO_R_UNABLE_TO_NODELAY);
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return 0;
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}
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}
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if (connect(sock, BIO_ADDR_sockaddr(addr),
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BIO_ADDR_sockaddr_size(addr)) == -1) {
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SYSerr(SYS_F_CONNECT, get_last_socket_error());
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BIOerr(BIO_F_BIO_CONNECT, BIO_R_CONNECT_ERROR);
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return 0;
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}
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return 1;
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}
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/*-
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* BIO_listen - Creates a listen socket
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* @sock: the socket to listen with
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* @addr: local address to bind to
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* @options: BIO socket options
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*
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* Binds to the address using the given socket and options, then
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* starts listening for incoming connections.
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*
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* Options can be a combination of the following:
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* - BIO_SOCK_KEEPALIVE: enable regularly sending keep-alive messages.
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* - BIO_SOCK_NONBLOCK: Make the socket non-blocking.
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* - BIO_SOCK_NODELAY: don't delay small messages.
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* - BIO_SOCK_REUSEADDR: Try to reuse the address and port combination
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* for a recently closed port.
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* - BIO_SOCK_V6_ONLY: When creating an IPv6 socket, make it listen only
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* for IPv6 addresses and not IPv4 addresses mapped to IPv6.
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*
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* It's recommended that you set up both an IPv6 and IPv4 listen socket, and
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* then check both for new clients that connect to it. You want to set up
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* the socket as non-blocking in that case since else it could hang.
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*
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* Not all operating systems support IPv4 addresses on an IPv6 socket, and for
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* others it's an option. If you pass the BIO_LISTEN_V6_ONLY it will try to
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* create the IPv6 sockets to only listen for IPv6 connection.
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*
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* It could be that the first BIO_listen() call will listen to all the IPv6
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* and IPv4 addresses and that then trying to bind to the IPv4 address will
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* fail. We can't tell the difference between already listening ourself to
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* it and someone else listening to it when failing and errno is EADDRINUSE, so
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* it's recommended to not give an error in that case if the first call was
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* succesful.
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*
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* When restarting the program it could be that the port is still in use. If
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* you set to BIO_SOCK_REUSEADDR option it will try to reuse the port anyway.
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* It's recommended that you use this.
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*/
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int BIO_listen(int sock, const BIO_ADDR *addr, int options)
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{
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int on = 1;
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int socktype;
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socklen_t socktype_len = sizeof(socktype);
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if (sock == -1) {
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BIOerr(BIO_F_BIO_LISTEN, BIO_R_INVALID_SOCKET);
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return 0;
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}
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if (getsockopt(sock, SOL_SOCKET, SO_TYPE, &socktype, &socktype_len) != 0
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|| socktype_len != sizeof(socktype)) {
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SYSerr(SYS_F_GETSOCKOPT, get_last_socket_error());
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BIOerr(BIO_F_BIO_LISTEN, BIO_R_GETTING_SOCKTYPE);
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return 0;
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}
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if (!BIO_socket_nbio(sock, (options & BIO_SOCK_NONBLOCK) != 0))
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return 0;
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# ifndef OPENSSL_SYS_WINDOWS
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/* SO_REUSEADDR has different behavior on Windows than on
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* other operating systems, don't set it there. */
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if (options & BIO_SOCK_REUSEADDR) {
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if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) != 0) {
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SYSerr(SYS_F_SETSOCKOPT, get_last_socket_error());
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BIOerr(BIO_F_BIO_LISTEN, BIO_R_UNABLE_TO_REUSEADDR);
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return 0;
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}
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}
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# endif
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if (options & BIO_SOCK_KEEPALIVE) {
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if (setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof(on)) != 0) {
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SYSerr(SYS_F_SETSOCKOPT, get_last_socket_error());
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BIOerr(BIO_F_BIO_LISTEN, BIO_R_UNABLE_TO_KEEPALIVE);
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return 0;
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}
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}
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if (options & BIO_SOCK_NODELAY) {
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if (setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) != 0) {
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SYSerr(SYS_F_SETSOCKOPT, get_last_socket_error());
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BIOerr(BIO_F_BIO_LISTEN, BIO_R_UNABLE_TO_NODELAY);
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return 0;
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}
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}
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# ifdef IPV6_V6ONLY
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if ((options & BIO_SOCK_V6_ONLY) && BIO_ADDR_family(addr) == AF_INET6) {
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if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) != 0) {
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SYSerr(SYS_F_SETSOCKOPT, get_last_socket_error());
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BIOerr(BIO_F_BIO_LISTEN, BIO_R_LISTEN_V6_ONLY);
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return 0;
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}
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}
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# endif
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if (bind(sock, BIO_ADDR_sockaddr(addr), BIO_ADDR_sockaddr_size(addr)) != 0) {
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SYSerr(SYS_F_BIND, get_last_socket_error());
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BIOerr(BIO_F_BIO_LISTEN, BIO_R_UNABLE_TO_BIND_SOCKET);
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return 0;
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}
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if (socktype != SOCK_DGRAM && listen(sock, MAX_LISTEN) == -1) {
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SYSerr(SYS_F_LISTEN, get_last_socket_error());
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BIOerr(BIO_F_BIO_LISTEN, BIO_R_UNABLE_TO_LISTEN_SOCKET);
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return 0;
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}
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return 1;
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}
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/*-
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* BIO_accept_ex - Accept new incoming connections
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* @sock: the listening socket
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* @addr: the BIO_ADDR to store the peer address in
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* @options: BIO socket options, applied on the accepted socket.
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*
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*/
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int BIO_accept_ex(int accept_sock, BIO_ADDR *addr_, int options)
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{
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socklen_t len;
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int accepted_sock;
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BIO_ADDR locaddr;
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BIO_ADDR *addr = addr_ == NULL ? &locaddr : addr_;
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len = sizeof(*addr);
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accepted_sock = accept(accept_sock,
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BIO_ADDR_sockaddr_noconst(addr), &len);
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if (accepted_sock == -1) {
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SYSerr(SYS_F_ACCEPT, get_last_socket_error());
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BIOerr(BIO_F_BIO_ACCEPT_EX, BIO_R_ACCEPT_ERROR);
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return INVALID_SOCKET;
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}
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if (!BIO_socket_nbio(accepted_sock, (options & BIO_SOCK_NONBLOCK) != 0))
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return INVALID_SOCKET;
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return accepted_sock;
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}
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/*-
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* BIO_closesocket - Close a socket
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* @sock: the socket to close
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*/
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int BIO_closesocket(int sock)
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{
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if (closesocket(sock) < 0)
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return 0;
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return 1;
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}
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#endif
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