[331] | 1 | /*
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| 2 | * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <stdio.h>
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| 11 | #include <stdlib.h>
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| 12 | #include <errno.h>
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| 13 |
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| 14 | #include "bio_lcl.h"
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| 15 |
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| 16 | #include <openssl/err.h>
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| 17 |
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| 18 | #ifndef OPENSSL_NO_SOCK
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| 19 | # ifdef SO_MAXCONN
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| 20 | # define MAX_LISTEN SO_MAXCONN
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| 21 | # elif defined(SOMAXCONN)
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| 22 | # define MAX_LISTEN SOMAXCONN
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| 23 | # else
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| 24 | # define MAX_LISTEN 32
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| 25 | # endif
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| 26 |
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| 27 | /*-
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| 28 | * BIO_socket - create a socket
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| 29 | * @domain: the socket domain (AF_INET, AF_INET6, AF_UNIX, ...)
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| 30 | * @socktype: the socket type (SOCK_STEAM, SOCK_DGRAM)
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| 31 | * @protocol: the protocol to use (IPPROTO_TCP, IPPROTO_UDP)
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| 32 | * @options: BIO socket options (currently unused)
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| 33 | *
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| 34 | * Creates a socket. This should be called before calling any
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| 35 | * of BIO_connect and BIO_listen.
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| 36 | *
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| 37 | * Returns the file descriptor on success or INVALID_SOCKET on failure. On
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| 38 | * failure errno is set, and a status is added to the OpenSSL error stack.
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| 39 | */
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| 40 | int BIO_socket(int domain, int socktype, int protocol, int options)
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| 41 | {
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| 42 | int sock = -1;
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| 43 |
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| 44 | if (BIO_sock_init() != 1)
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| 45 | return INVALID_SOCKET;
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| 46 |
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| 47 | sock = socket(domain, socktype, protocol);
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| 48 | if (sock == -1) {
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| 49 | SYSerr(SYS_F_SOCKET, get_last_socket_error());
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| 50 | BIOerr(BIO_F_BIO_SOCKET, BIO_R_UNABLE_TO_CREATE_SOCKET);
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| 51 | return INVALID_SOCKET;
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| 52 | }
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| 53 |
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| 54 | return sock;
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| 55 | }
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| 56 |
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| 57 | /*-
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| 58 | * BIO_connect - connect to an address
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| 59 | * @sock: the socket to connect with
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| 60 | * @addr: the address to connect to
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| 61 | * @options: BIO socket options
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| 62 | *
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| 63 | * Connects to the address using the given socket and options.
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| 64 | *
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| 65 | * Options can be a combination of the following:
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| 66 | * - BIO_SOCK_KEEPALIVE: enable regularly sending keep-alive messages.
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| 67 | * - BIO_SOCK_NONBLOCK: Make the socket non-blocking.
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| 68 | * - BIO_SOCK_NODELAY: don't delay small messages.
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| 69 | *
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| 70 | * options holds BIO socket options that can be used
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| 71 | * You should call this for every address returned by BIO_lookup
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| 72 | * until the connection is successful.
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| 73 | *
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| 74 | * Returns 1 on success or 0 on failure. On failure errno is set
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| 75 | * and an error status is added to the OpenSSL error stack.
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| 76 | */
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| 77 | int BIO_connect(int sock, const BIO_ADDR *addr, int options)
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| 78 | {
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| 79 | int on = 1;
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| 80 |
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| 81 | if (sock == -1) {
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| 82 | BIOerr(BIO_F_BIO_CONNECT, BIO_R_INVALID_SOCKET);
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| 83 | return 0;
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| 84 | }
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| 85 |
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| 86 | if (!BIO_socket_nbio(sock, (options & BIO_SOCK_NONBLOCK) != 0))
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| 87 | return 0;
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| 88 |
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| 89 | if (options & BIO_SOCK_KEEPALIVE) {
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| 90 | if (setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof(on)) != 0) {
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| 91 | SYSerr(SYS_F_SETSOCKOPT, get_last_socket_error());
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| 92 | BIOerr(BIO_F_BIO_CONNECT, BIO_R_UNABLE_TO_KEEPALIVE);
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| 93 | return 0;
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| 94 | }
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| 95 | }
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| 96 |
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| 97 | if (options & BIO_SOCK_NODELAY) {
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| 98 | if (setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) != 0) {
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| 99 | SYSerr(SYS_F_SETSOCKOPT, get_last_socket_error());
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| 100 | BIOerr(BIO_F_BIO_CONNECT, BIO_R_UNABLE_TO_NODELAY);
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| 101 | return 0;
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| 102 | }
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| 103 | }
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| 104 |
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| 105 | if (connect(sock, BIO_ADDR_sockaddr(addr),
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| 106 | BIO_ADDR_sockaddr_size(addr)) == -1) {
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| 107 | if (!BIO_sock_should_retry(-1)) {
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| 108 | SYSerr(SYS_F_CONNECT, get_last_socket_error());
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| 109 | BIOerr(BIO_F_BIO_CONNECT, BIO_R_CONNECT_ERROR);
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| 110 | }
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| 111 | return 0;
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| 112 | }
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| 113 | return 1;
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| 114 | }
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| 115 |
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| 116 | /*-
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| 117 | * BIO_listen - Creates a listen socket
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| 118 | * @sock: the socket to listen with
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| 119 | * @addr: local address to bind to
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| 120 | * @options: BIO socket options
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| 121 | *
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| 122 | * Binds to the address using the given socket and options, then
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| 123 | * starts listening for incoming connections.
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| 124 | *
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| 125 | * Options can be a combination of the following:
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| 126 | * - BIO_SOCK_KEEPALIVE: enable regularly sending keep-alive messages.
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| 127 | * - BIO_SOCK_NONBLOCK: Make the socket non-blocking.
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| 128 | * - BIO_SOCK_NODELAY: don't delay small messages.
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| 129 | * - BIO_SOCK_REUSEADDR: Try to reuse the address and port combination
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| 130 | * for a recently closed port.
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| 131 | * - BIO_SOCK_V6_ONLY: When creating an IPv6 socket, make it listen only
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| 132 | * for IPv6 addresses and not IPv4 addresses mapped to IPv6.
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| 133 | *
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| 134 | * It's recommended that you set up both an IPv6 and IPv4 listen socket, and
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| 135 | * then check both for new clients that connect to it. You want to set up
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| 136 | * the socket as non-blocking in that case since else it could hang.
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| 137 | *
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| 138 | * Not all operating systems support IPv4 addresses on an IPv6 socket, and for
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| 139 | * others it's an option. If you pass the BIO_LISTEN_V6_ONLY it will try to
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| 140 | * create the IPv6 sockets to only listen for IPv6 connection.
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| 141 | *
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| 142 | * It could be that the first BIO_listen() call will listen to all the IPv6
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| 143 | * and IPv4 addresses and that then trying to bind to the IPv4 address will
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| 144 | * fail. We can't tell the difference between already listening ourself to
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| 145 | * it and someone else listening to it when failing and errno is EADDRINUSE, so
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| 146 | * it's recommended to not give an error in that case if the first call was
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| 147 | * successful.
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| 148 | *
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| 149 | * When restarting the program it could be that the port is still in use. If
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| 150 | * you set to BIO_SOCK_REUSEADDR option it will try to reuse the port anyway.
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| 151 | * It's recommended that you use this.
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| 152 | */
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| 153 | int BIO_listen(int sock, const BIO_ADDR *addr, int options)
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| 154 | {
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| 155 | int on = 1;
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| 156 | int socktype;
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| 157 | socklen_t socktype_len = sizeof(socktype);
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| 158 |
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| 159 | if (sock == -1) {
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| 160 | BIOerr(BIO_F_BIO_LISTEN, BIO_R_INVALID_SOCKET);
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| 161 | return 0;
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| 162 | }
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| 163 |
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| 164 | if (getsockopt(sock, SOL_SOCKET, SO_TYPE, &socktype, &socktype_len) != 0
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| 165 | || socktype_len != sizeof(socktype)) {
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| 166 | SYSerr(SYS_F_GETSOCKOPT, get_last_socket_error());
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| 167 | BIOerr(BIO_F_BIO_LISTEN, BIO_R_GETTING_SOCKTYPE);
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| 168 | return 0;
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| 169 | }
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| 170 |
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| 171 | if (!BIO_socket_nbio(sock, (options & BIO_SOCK_NONBLOCK) != 0))
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| 172 | return 0;
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| 173 |
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| 174 | # ifndef OPENSSL_SYS_WINDOWS
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| 175 | /* SO_REUSEADDR has different behavior on Windows than on
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| 176 | * other operating systems, don't set it there. */
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| 177 | if (options & BIO_SOCK_REUSEADDR) {
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| 178 | if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) != 0) {
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| 179 | SYSerr(SYS_F_SETSOCKOPT, get_last_socket_error());
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| 180 | BIOerr(BIO_F_BIO_LISTEN, BIO_R_UNABLE_TO_REUSEADDR);
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| 181 | return 0;
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| 182 | }
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| 183 | }
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| 184 | # endif
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| 185 |
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| 186 | if (options & BIO_SOCK_KEEPALIVE) {
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| 187 | if (setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof(on)) != 0) {
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| 188 | SYSerr(SYS_F_SETSOCKOPT, get_last_socket_error());
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| 189 | BIOerr(BIO_F_BIO_LISTEN, BIO_R_UNABLE_TO_KEEPALIVE);
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| 190 | return 0;
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| 191 | }
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| 192 | }
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| 193 |
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| 194 | if (options & BIO_SOCK_NODELAY) {
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| 195 | if (setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) != 0) {
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| 196 | SYSerr(SYS_F_SETSOCKOPT, get_last_socket_error());
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| 197 | BIOerr(BIO_F_BIO_LISTEN, BIO_R_UNABLE_TO_NODELAY);
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| 198 | return 0;
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| 199 | }
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| 200 | }
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| 201 |
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| 202 | # ifdef IPV6_V6ONLY
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| 203 | if ((options & BIO_SOCK_V6_ONLY) && BIO_ADDR_family(addr) == AF_INET6) {
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| 204 | if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) != 0) {
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| 205 | SYSerr(SYS_F_SETSOCKOPT, get_last_socket_error());
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| 206 | BIOerr(BIO_F_BIO_LISTEN, BIO_R_LISTEN_V6_ONLY);
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| 207 | return 0;
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| 208 | }
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| 209 | }
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| 210 | # endif
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| 211 |
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| 212 | if (bind(sock, BIO_ADDR_sockaddr(addr), BIO_ADDR_sockaddr_size(addr)) != 0) {
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| 213 | SYSerr(SYS_F_BIND, get_last_socket_error());
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| 214 | BIOerr(BIO_F_BIO_LISTEN, BIO_R_UNABLE_TO_BIND_SOCKET);
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| 215 | return 0;
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| 216 | }
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| 217 |
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| 218 | if (socktype != SOCK_DGRAM && listen(sock, MAX_LISTEN) == -1) {
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| 219 | SYSerr(SYS_F_LISTEN, get_last_socket_error());
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| 220 | BIOerr(BIO_F_BIO_LISTEN, BIO_R_UNABLE_TO_LISTEN_SOCKET);
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| 221 | return 0;
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| 222 | }
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| 223 |
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| 224 | return 1;
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| 225 | }
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| 226 |
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| 227 | /*-
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| 228 | * BIO_accept_ex - Accept new incoming connections
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| 229 | * @sock: the listening socket
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| 230 | * @addr: the BIO_ADDR to store the peer address in
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| 231 | * @options: BIO socket options, applied on the accepted socket.
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| 232 | *
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| 233 | */
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| 234 | int BIO_accept_ex(int accept_sock, BIO_ADDR *addr_, int options)
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| 235 | {
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| 236 | socklen_t len;
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| 237 | int accepted_sock;
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| 238 | BIO_ADDR locaddr;
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| 239 | BIO_ADDR *addr = addr_ == NULL ? &locaddr : addr_;
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| 240 |
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| 241 | len = sizeof(*addr);
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| 242 | accepted_sock = accept(accept_sock,
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| 243 | BIO_ADDR_sockaddr_noconst(addr), &len);
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| 244 | if (accepted_sock == -1) {
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| 245 | if (!BIO_sock_should_retry(accepted_sock)) {
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| 246 | SYSerr(SYS_F_ACCEPT, get_last_socket_error());
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| 247 | BIOerr(BIO_F_BIO_ACCEPT_EX, BIO_R_ACCEPT_ERROR);
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| 248 | }
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| 249 | return INVALID_SOCKET;
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| 250 | }
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| 251 |
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| 252 | if (!BIO_socket_nbio(accepted_sock, (options & BIO_SOCK_NONBLOCK) != 0)) {
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| 253 | closesocket(accepted_sock);
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| 254 | return INVALID_SOCKET;
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| 255 | }
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| 256 |
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| 257 | return accepted_sock;
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| 258 | }
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| 259 |
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| 260 | /*-
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| 261 | * BIO_closesocket - Close a socket
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| 262 | * @sock: the socket to close
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| 263 | */
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| 264 | int BIO_closesocket(int sock)
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| 265 | {
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| 266 | if (closesocket(sock) < 0)
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| 267 | return 0;
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| 268 | return 1;
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| 269 | }
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| 270 | #endif
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