319 lines
9.9 KiB
C
319 lines
9.9 KiB
C
/*
|
|
* Copyright 2016-2021 The OpenSSL Project Authors. All Rights Reserved.
|
|
*
|
|
* Licensed under the OpenSSL license (the "License"). You may not use
|
|
* this file except in compliance with the License. You can obtain a copy
|
|
* in the file LICENSE in the source distribution or at
|
|
* https://www.openssl.org/source/license.html
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <errno.h>
|
|
|
|
#include "bio_local.h"
|
|
|
|
#include <openssl/err.h>
|
|
|
|
#ifndef OPENSSL_NO_SOCK
|
|
# ifdef SO_MAXCONN
|
|
# define MAX_LISTEN SO_MAXCONN
|
|
# elif defined(SOMAXCONN)
|
|
# define MAX_LISTEN SOMAXCONN
|
|
# else
|
|
# define MAX_LISTEN 32
|
|
# endif
|
|
|
|
/*-
|
|
* BIO_socket - create a socket
|
|
* @domain: the socket domain (AF_INET, AF_INET6, AF_UNIX, ...)
|
|
* @socktype: the socket type (SOCK_STEAM, SOCK_DGRAM)
|
|
* @protocol: the protocol to use (IPPROTO_TCP, IPPROTO_UDP)
|
|
* @options: BIO socket options (currently unused)
|
|
*
|
|
* Creates a socket. This should be called before calling any
|
|
* of BIO_connect and BIO_listen.
|
|
*
|
|
* Returns the file descriptor on success or INVALID_SOCKET on failure. On
|
|
* failure errno is set, and a status is added to the OpenSSL error stack.
|
|
*/
|
|
int BIO_socket(int domain, int socktype, int protocol, int options)
|
|
{
|
|
int sock = -1;
|
|
|
|
if (BIO_sock_init() != 1)
|
|
return INVALID_SOCKET;
|
|
|
|
sock = socket(domain, socktype, protocol);
|
|
if (sock == -1) {
|
|
SYSerr(SYS_F_SOCKET, get_last_socket_error());
|
|
BIOerr(BIO_F_BIO_SOCKET, BIO_R_UNABLE_TO_CREATE_SOCKET);
|
|
return INVALID_SOCKET;
|
|
}
|
|
|
|
return sock;
|
|
}
|
|
|
|
/*-
|
|
* BIO_connect - connect to an address
|
|
* @sock: the socket to connect with
|
|
* @addr: the address to connect to
|
|
* @options: BIO socket options
|
|
*
|
|
* Connects to the address using the given socket and options.
|
|
*
|
|
* Options can be a combination of the following:
|
|
* - BIO_SOCK_KEEPALIVE: enable regularly sending keep-alive messages.
|
|
* - BIO_SOCK_NONBLOCK: Make the socket non-blocking.
|
|
* - BIO_SOCK_NODELAY: don't delay small messages.
|
|
*
|
|
* options holds BIO socket options that can be used
|
|
* You should call this for every address returned by BIO_lookup
|
|
* until the connection is successful.
|
|
*
|
|
* Returns 1 on success or 0 on failure. On failure errno is set
|
|
* and an error status is added to the OpenSSL error stack.
|
|
*/
|
|
int BIO_connect(int sock, const BIO_ADDR *addr, int options)
|
|
{
|
|
const int on = 1;
|
|
|
|
if (sock == -1) {
|
|
BIOerr(BIO_F_BIO_CONNECT, BIO_R_INVALID_SOCKET);
|
|
return 0;
|
|
}
|
|
|
|
if (!BIO_socket_nbio(sock, (options & BIO_SOCK_NONBLOCK) != 0))
|
|
return 0;
|
|
|
|
if (options & BIO_SOCK_KEEPALIVE) {
|
|
if (setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
|
|
(const void *)&on, sizeof(on)) != 0) {
|
|
SYSerr(SYS_F_SETSOCKOPT, get_last_socket_error());
|
|
BIOerr(BIO_F_BIO_CONNECT, BIO_R_UNABLE_TO_KEEPALIVE);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if (options & BIO_SOCK_NODELAY) {
|
|
if (setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
|
|
(const void *)&on, sizeof(on)) != 0) {
|
|
SYSerr(SYS_F_SETSOCKOPT, get_last_socket_error());
|
|
BIOerr(BIO_F_BIO_CONNECT, BIO_R_UNABLE_TO_NODELAY);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if (connect(sock, BIO_ADDR_sockaddr(addr),
|
|
BIO_ADDR_sockaddr_size(addr)) == -1) {
|
|
if (!BIO_sock_should_retry(-1)) {
|
|
SYSerr(SYS_F_CONNECT, get_last_socket_error());
|
|
BIOerr(BIO_F_BIO_CONNECT, BIO_R_CONNECT_ERROR);
|
|
}
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/*-
|
|
* BIO_bind - bind socket to address
|
|
* @sock: the socket to set
|
|
* @addr: local address to bind to
|
|
* @options: BIO socket options
|
|
*
|
|
* Binds to the address using the given socket and options.
|
|
*
|
|
* Options can be a combination of the following:
|
|
* - BIO_SOCK_REUSEADDR: Try to reuse the address and port combination
|
|
* for a recently closed port.
|
|
*
|
|
* When restarting the program it could be that the port is still in use. If
|
|
* you set to BIO_SOCK_REUSEADDR option it will try to reuse the port anyway.
|
|
* It's recommended that you use this.
|
|
*/
|
|
int BIO_bind(int sock, const BIO_ADDR *addr, int options)
|
|
{
|
|
# ifndef OPENSSL_SYS_WINDOWS
|
|
int on = 1;
|
|
# endif
|
|
|
|
if (sock == -1) {
|
|
BIOerr(BIO_F_BIO_BIND, BIO_R_INVALID_SOCKET);
|
|
return 0;
|
|
}
|
|
|
|
# ifndef OPENSSL_SYS_WINDOWS
|
|
/*
|
|
* SO_REUSEADDR has different behavior on Windows than on
|
|
* other operating systems, don't set it there.
|
|
*/
|
|
if (options & BIO_SOCK_REUSEADDR) {
|
|
if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
|
|
(const void *)&on, sizeof(on)) != 0) {
|
|
SYSerr(SYS_F_SETSOCKOPT, get_last_socket_error());
|
|
BIOerr(BIO_F_BIO_BIND, BIO_R_UNABLE_TO_REUSEADDR);
|
|
return 0;
|
|
}
|
|
}
|
|
# endif
|
|
|
|
if (bind(sock, BIO_ADDR_sockaddr(addr), BIO_ADDR_sockaddr_size(addr)) != 0) {
|
|
SYSerr(SYS_F_BIND, get_last_socket_error());
|
|
BIOerr(BIO_F_BIO_BIND, BIO_R_UNABLE_TO_BIND_SOCKET);
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*-
|
|
* BIO_listen - Creates a listen socket
|
|
* @sock: the socket to listen with
|
|
* @addr: local address to bind to
|
|
* @options: BIO socket options
|
|
*
|
|
* Binds to the address using the given socket and options, then
|
|
* starts listening for incoming connections.
|
|
*
|
|
* Options can be a combination of the following:
|
|
* - BIO_SOCK_KEEPALIVE: enable regularly sending keep-alive messages.
|
|
* - BIO_SOCK_NONBLOCK: Make the socket non-blocking.
|
|
* - BIO_SOCK_NODELAY: don't delay small messages.
|
|
* - BIO_SOCK_REUSEADDR: Try to reuse the address and port combination
|
|
* for a recently closed port.
|
|
* - BIO_SOCK_V6_ONLY: When creating an IPv6 socket, make it listen only
|
|
* for IPv6 addresses and not IPv4 addresses mapped to IPv6.
|
|
*
|
|
* It's recommended that you set up both an IPv6 and IPv4 listen socket, and
|
|
* then check both for new clients that connect to it. You want to set up
|
|
* the socket as non-blocking in that case since else it could hang.
|
|
*
|
|
* Not all operating systems support IPv4 addresses on an IPv6 socket, and for
|
|
* others it's an option. If you pass the BIO_LISTEN_V6_ONLY it will try to
|
|
* create the IPv6 sockets to only listen for IPv6 connection.
|
|
*
|
|
* It could be that the first BIO_listen() call will listen to all the IPv6
|
|
* and IPv4 addresses and that then trying to bind to the IPv4 address will
|
|
* fail. We can't tell the difference between already listening ourself to
|
|
* it and someone else listening to it when failing and errno is EADDRINUSE, so
|
|
* it's recommended to not give an error in that case if the first call was
|
|
* successful.
|
|
*
|
|
* When restarting the program it could be that the port is still in use. If
|
|
* you set to BIO_SOCK_REUSEADDR option it will try to reuse the port anyway.
|
|
* It's recommended that you use this.
|
|
*/
|
|
int BIO_listen(int sock, const BIO_ADDR *addr, int options)
|
|
{
|
|
int on = 1;
|
|
int socktype;
|
|
socklen_t socktype_len = sizeof(socktype);
|
|
|
|
if (sock == -1) {
|
|
BIOerr(BIO_F_BIO_LISTEN, BIO_R_INVALID_SOCKET);
|
|
return 0;
|
|
}
|
|
|
|
if (getsockopt(sock, SOL_SOCKET, SO_TYPE,
|
|
(void *)&socktype, &socktype_len) != 0
|
|
|| socktype_len != sizeof(socktype)) {
|
|
SYSerr(SYS_F_GETSOCKOPT, get_last_socket_error());
|
|
BIOerr(BIO_F_BIO_LISTEN, BIO_R_GETTING_SOCKTYPE);
|
|
return 0;
|
|
}
|
|
|
|
if (!BIO_socket_nbio(sock, (options & BIO_SOCK_NONBLOCK) != 0))
|
|
return 0;
|
|
|
|
if (options & BIO_SOCK_KEEPALIVE) {
|
|
if (setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
|
|
(const void *)&on, sizeof(on)) != 0) {
|
|
SYSerr(SYS_F_SETSOCKOPT, get_last_socket_error());
|
|
BIOerr(BIO_F_BIO_LISTEN, BIO_R_UNABLE_TO_KEEPALIVE);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if (options & BIO_SOCK_NODELAY) {
|
|
if (setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
|
|
(const void *)&on, sizeof(on)) != 0) {
|
|
SYSerr(SYS_F_SETSOCKOPT, get_last_socket_error());
|
|
BIOerr(BIO_F_BIO_LISTEN, BIO_R_UNABLE_TO_NODELAY);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* On OpenBSD it is always ipv6 only with ipv6 sockets thus read-only */
|
|
# if defined(IPV6_V6ONLY) && !defined(__OpenBSD__)
|
|
if (BIO_ADDR_family(addr) == AF_INET6) {
|
|
/*
|
|
* Note: Windows default of IPV6_V6ONLY is ON, and Linux is OFF.
|
|
* Therefore we always have to use setsockopt here.
|
|
*/
|
|
on = options & BIO_SOCK_V6_ONLY ? 1 : 0;
|
|
if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY,
|
|
(const void *)&on, sizeof(on)) != 0) {
|
|
SYSerr(SYS_F_SETSOCKOPT, get_last_socket_error());
|
|
BIOerr(BIO_F_BIO_LISTEN, BIO_R_LISTEN_V6_ONLY);
|
|
return 0;
|
|
}
|
|
}
|
|
# endif
|
|
|
|
if (!BIO_bind(sock, addr, options))
|
|
return 0;
|
|
|
|
if (socktype != SOCK_DGRAM && listen(sock, MAX_LISTEN) == -1) {
|
|
SYSerr(SYS_F_LISTEN, get_last_socket_error());
|
|
BIOerr(BIO_F_BIO_LISTEN, BIO_R_UNABLE_TO_LISTEN_SOCKET);
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*-
|
|
* BIO_accept_ex - Accept new incoming connections
|
|
* @sock: the listening socket
|
|
* @addr: the BIO_ADDR to store the peer address in
|
|
* @options: BIO socket options, applied on the accepted socket.
|
|
*
|
|
*/
|
|
int BIO_accept_ex(int accept_sock, BIO_ADDR *addr_, int options)
|
|
{
|
|
socklen_t len;
|
|
int accepted_sock;
|
|
BIO_ADDR locaddr;
|
|
BIO_ADDR *addr = addr_ == NULL ? &locaddr : addr_;
|
|
|
|
len = sizeof(*addr);
|
|
accepted_sock = accept(accept_sock,
|
|
BIO_ADDR_sockaddr_noconst(addr), &len);
|
|
if (accepted_sock == -1) {
|
|
if (!BIO_sock_should_retry(accepted_sock)) {
|
|
SYSerr(SYS_F_ACCEPT, get_last_socket_error());
|
|
BIOerr(BIO_F_BIO_ACCEPT_EX, BIO_R_ACCEPT_ERROR);
|
|
}
|
|
return INVALID_SOCKET;
|
|
}
|
|
|
|
if (!BIO_socket_nbio(accepted_sock, (options & BIO_SOCK_NONBLOCK) != 0)) {
|
|
closesocket(accepted_sock);
|
|
return INVALID_SOCKET;
|
|
}
|
|
|
|
return accepted_sock;
|
|
}
|
|
|
|
/*-
|
|
* BIO_closesocket - Close a socket
|
|
* @sock: the socket to close
|
|
*/
|
|
int BIO_closesocket(int sock)
|
|
{
|
|
if (closesocket(sock) < 0)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
#endif
|