/*
* Copyright 1995-2018 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
*/
/* socket-related functions used by s_client and s_server */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <signal.h>
#include <openssl/opensslconf.h>
/*
* With IPv6, it looks like Digital has mixed up the proper order of
* recursive header file inclusion, resulting in the compiler complaining
* that u_int isn't defined, but only if _POSIX_C_SOURCE is defined, which is
* needed to have fileno() declared correctly... So let's define u_int
*/
#if defined(OPENSSL_SYS_VMS_DECC) && !defined(__U_INT)
# define __U_INT
typedef unsigned int u_int;
#endif
#ifndef OPENSSL_NO_SOCK
# define USE_SOCKETS
# include "apps.h"
# undef USE_SOCKETS
# include "s_apps.h"
# include <openssl/bio.h>
# include <openssl/err.h>
/*
* init_client - helper routine to set up socket communication
* @sock: pointer to storage of resulting socket.
* @host: the host name or path (for AF_UNIX) to connect to.
* @port: the port to connect to (ignored for AF_UNIX).
* @family: desired socket family, may be AF_INET, AF_INET6, AF_UNIX or
* AF_UNSPEC
* @type: socket type, must be SOCK_STREAM or SOCK_DGRAM
*
* This will create a socket and use it to connect to a host:port, or if
* family == AF_UNIX, to the path found in host.
*
* If the host has more than one address, it will try them one by one until
* a successful connection is established. The resulting socket will be
* found in *sock on success, it will be given INVALID_SOCKET otherwise.
*
* Returns 1 on success, 0 on failure.
*/
int init_client(int *sock, const char *host, const char *port,
int family, int type)
{
BIO_ADDRINFO *res = NULL;
const BIO_ADDRINFO *ai = NULL;
int ret;
if (!BIO_sock_init())
return 0;
ret = BIO_lookup(host, port, BIO_LOOKUP_CLIENT, family, type, &res);
if (ret == 0) {
ERR_print_errors(bio_err);
return 0;
}
ret = 0;
for (ai = res; ai != NULL; ai = BIO_ADDRINFO_next(ai)) {
/* Admittedly, these checks are quite paranoid, we should not get
* anything in the BIO_ADDRINFO chain that we haven't
* asked for. */
OPENSSL_assert((family == AF_UNSPEC
|| family == BIO_ADDRINFO_family(ai))
&& (type == 0 || type == BIO_ADDRINFO_socktype(ai)));
*sock = BIO_socket(BIO_ADDRINFO_family(ai), BIO_ADDRINFO_socktype(ai),
BIO_ADDRINFO_protocol(ai), 0);
if (*sock == INVALID_SOCKET) {
/* Maybe the kernel doesn't support the socket family, even if
* BIO_lookup() added it in the returned result...
*/
continue;
}
if (!BIO_connect(*sock, BIO_ADDRINFO_address(ai), 0)) {
BIO_closesocket(*sock);
*sock = INVALID_SOCKET;
continue;
}
/* Success, don't try any more addresses */
break;
}
if (*sock == INVALID_SOCKET) {
ERR_print_errors(bio_err);
} else {
/* Remove any stale errors from previous connection attempts */
ERR_clear_error();
ret = 1;
}
BIO_ADDRINFO_free(res);
return ret;
}
/*
* do_server - helper routine to perform a server operation
* @accept_sock: pointer to storage of resulting socket.
* @host: the host name or path (for AF_UNIX) to connect to.
* @port: the port to connect to (ignored for AF_UNIX).
* @family: desired socket family, may be AF_INET, AF_INET6, AF_UNIX or
* AF_UNSPEC
* @type: socket type, must be SOCK_STREAM or SOCK_DGRAM
* @cb: pointer to a function that receives the accepted socket and
* should perform the communication with the connecting client.
* @context: pointer to memory that's passed verbatim to the cb function.
* @naccept: number of times an incoming connect should be accepted. If -1,
* unlimited number.
*
* This will create a socket and use it to listen to a host:port, or if
* family == AF_UNIX, to the path found in host, then start accepting
* incoming connections and run cb on the resulting socket.
*
* 0 on failure, something other on success.
*/
int do_server(int *accept_sock, const char *host, const char *port,
int family, int type, do_server_cb cb,
unsigned char *context, int naccept)
{
int asock = 0;
int sock;
int i;
BIO_ADDRINFO *res = NULL;
const BIO_ADDRINFO *next;
int sock_family, sock_type, sock_protocol;
const BIO_ADDR *sock_address;
int sock_options = BIO_SOCK_REUSEADDR;
int ret = 0;
if (!BIO_sock_init())
return 0;
if (!BIO_lookup(host, port, BIO_LOOKUP_SERVER, family, type, &res)) {
ERR_print_errors(bio_err);
return 0;
}
/* Admittedly, these checks are quite paranoid, we should not get
* anything in the BIO_ADDRINFO chain that we haven't asked for */
OPENSSL_assert((family == AF_UNSPEC || family == BIO_ADDRINFO_family(res))
&& (type == 0 || type == BIO_ADDRINFO_socktype(res)));
sock_family = BIO_ADDRINFO_family(res);
sock_type = BIO_ADDRINFO_socktype(res);
sock_protocol = BIO_ADDRINFO_protocol(res);
sock_address = BIO_ADDRINFO_address(res);
next = BIO_ADDRINFO_next(res);
if (sock_family == AF_INET6)
sock_options |= BIO_SOCK_V6_ONLY;
if (next != NULL
&& BIO_ADDRINFO_socktype(next) == sock_type
&& BIO_ADDRINFO_protocol(next) == sock_protocol) {
if (sock_family == AF_INET
&& BIO_ADDRINFO_family(next) == AF_INET6) {
sock_family = AF_INET6;
sock_address = BIO_ADDRINFO_address(next);
} else if (sock_family == AF_INET6
&& BIO_ADDRINFO_family(next) == AF_INET) {
sock_options &= ~BIO_SOCK_V6_ONLY;
}
}
asock = BIO_socket(sock_family, sock_type, sock_protocol, 0);
if (asock == INVALID_SOCKET
|| !BIO_listen(asock, sock_address, sock_options)) {
BIO_ADDRINFO_free(res);
ERR_print_errors(bio_err);
if (asock != INVALID_SOCKET)
BIO_closesocket(asock);
goto end;
}
BIO_ADDRINFO_free(res);
res = NULL;
if (accept_sock != NULL)
*accept_sock = asock;
for (;;) {
if (type == SOCK_STREAM) {
do {
sock = BIO_accept_ex(asock, NULL, 0);
} while (sock < 0 && BIO_sock_should_retry(sock));
if (sock < 0) {
ERR_print_errors(bio_err);
BIO_closesocket(asock);
break;
}
i = (*cb)(sock, type, context);
/*
* Give the socket time to send its last data before we close it.
* No amount of setting SO_LINGER etc on the socket seems to
* persuade Windows to send the data before closing the socket...
* but sleeping for a short time seems to do it (units in ms)
* TODO: Find a better way to do this
*/
#if defined(OPENSSL_SYS_WINDOWS)
Sleep(50);
#elif defined(OPENSSL_SYS_CYGWIN)
usleep(50000);
#endif
/*
* If we ended with an alert being sent, but still with data in the
* network buffer to be read, then calling BIO_closesocket() will
* result in a TCP-RST being sent. On some platforms (notably
* Windows) then this will result in the peer immediately abandoning
* the connection including any buffered alert data before it has
* had a chance to be read. Shutting down the sending side first,
* and then closing the socket sends TCP-FIN first followed by
* TCP-RST. This seems to allow the peer to read the alert data.
*/
shutdown(sock, 1); /* SHUT_WR */
BIO_closesocket(sock);
} else {
i = (*cb)(asock, type, context);
}
if (naccept != -1)
naccept--;
if (i < 0 || naccept == 0) {
BIO_closesocket(asock);
ret = i;
break;
}
}
end:
# ifdef AF_UNIX
if (family == AF_UNIX)
unlink(host);
# endif
return ret;
}
#endif /* OPENSSL_NO_SOCK */
