660 lines
15 KiB
C
Executable file
660 lines
15 KiB
C
Executable file
/* $OpenBSD: bss_dgram.c,v 1.43 2022/01/07 09:02:17 tb Exp $ */
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/*
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* DTLS implementation written by Nagendra Modadugu
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* (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
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*/
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/* ====================================================================
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* Copyright (c) 1999-2005 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 <sys/socket.h>
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#include <sys/time.h>
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#include <netinet/in.h>
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#include <errno.h>
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#include <netdb.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <openssl/opensslconf.h>
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#include <openssl/bio.h>
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#include "bio_local.h"
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#ifndef OPENSSL_NO_DGRAM
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static int dgram_write(BIO *h, const char *buf, int num);
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static int dgram_read(BIO *h, char *buf, int size);
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static int dgram_puts(BIO *h, const char *str);
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static long dgram_ctrl(BIO *h, int cmd, long arg1, void *arg2);
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static int dgram_new(BIO *h);
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static int dgram_free(BIO *data);
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static int dgram_clear(BIO *bio);
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static int BIO_dgram_should_retry(int s);
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static const BIO_METHOD methods_dgramp = {
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.type = BIO_TYPE_DGRAM,
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.name = "datagram socket",
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.bwrite = dgram_write,
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.bread = dgram_read,
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.bputs = dgram_puts,
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.ctrl = dgram_ctrl,
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.create = dgram_new,
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.destroy = dgram_free
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};
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typedef struct bio_dgram_data_st {
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union {
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struct sockaddr sa;
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struct sockaddr_in sa_in;
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struct sockaddr_in6 sa_in6;
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} peer;
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unsigned int connected;
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unsigned int _errno;
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unsigned int mtu;
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struct timeval next_timeout;
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struct timeval socket_timeout;
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} bio_dgram_data;
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const BIO_METHOD *
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BIO_s_datagram(void)
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{
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return (&methods_dgramp);
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}
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BIO *
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BIO_new_dgram(int fd, int close_flag)
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{
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BIO *ret;
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ret = BIO_new(BIO_s_datagram());
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if (ret == NULL)
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return (NULL);
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BIO_set_fd(ret, fd, close_flag);
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return (ret);
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}
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static int
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dgram_new(BIO *bi)
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{
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bio_dgram_data *data = NULL;
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bi->init = 0;
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bi->num = 0;
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data = calloc(1, sizeof(bio_dgram_data));
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if (data == NULL)
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return 0;
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bi->ptr = data;
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bi->flags = 0;
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return (1);
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}
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static int
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dgram_free(BIO *a)
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{
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bio_dgram_data *data;
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if (a == NULL)
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return (0);
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if (!dgram_clear(a))
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return 0;
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data = (bio_dgram_data *)a->ptr;
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free(data);
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return (1);
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}
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static int
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dgram_clear(BIO *a)
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{
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if (a == NULL)
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return (0);
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if (a->shutdown) {
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if (a->init) {
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shutdown(a->num, SHUT_RDWR);
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close(a->num);
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}
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a->init = 0;
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a->flags = 0;
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}
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return (1);
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}
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static void
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dgram_adjust_rcv_timeout(BIO *b)
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{
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#if defined(SO_RCVTIMEO)
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bio_dgram_data *data = (bio_dgram_data *)b->ptr;
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/* Is a timer active? */
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if (data->next_timeout.tv_sec > 0 || data->next_timeout.tv_usec > 0) {
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struct timeval timenow, timeleft;
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/* Read current socket timeout */
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socklen_t sz = sizeof(data->socket_timeout);
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if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
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&(data->socket_timeout), &sz) < 0) {
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perror("getsockopt");
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}
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/* Get current time */
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gettimeofday(&timenow, NULL);
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/* Calculate time left until timer expires */
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memcpy(&timeleft, &(data->next_timeout), sizeof(struct timeval));
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timeleft.tv_sec -= timenow.tv_sec;
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timeleft.tv_usec -= timenow.tv_usec;
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if (timeleft.tv_usec < 0) {
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timeleft.tv_sec--;
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timeleft.tv_usec += 1000000;
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}
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if (timeleft.tv_sec < 0) {
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timeleft.tv_sec = 0;
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timeleft.tv_usec = 1;
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}
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/* Adjust socket timeout if next handhake message timer
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* will expire earlier.
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*/
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if ((data->socket_timeout.tv_sec == 0 &&
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data->socket_timeout.tv_usec == 0) ||
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(data->socket_timeout.tv_sec > timeleft.tv_sec) ||
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(data->socket_timeout.tv_sec == timeleft.tv_sec &&
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data->socket_timeout.tv_usec >= timeleft.tv_usec)) {
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if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
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&timeleft, sizeof(struct timeval)) < 0) {
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perror("setsockopt");
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}
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}
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}
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#endif
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}
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static void
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dgram_reset_rcv_timeout(BIO *b)
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{
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#if defined(SO_RCVTIMEO)
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bio_dgram_data *data = (bio_dgram_data *)b->ptr;
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/* Is a timer active? */
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if (data->next_timeout.tv_sec > 0 || data->next_timeout.tv_usec > 0) {
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if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
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&(data->socket_timeout), sizeof(struct timeval)) < 0) {
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perror("setsockopt");
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}
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}
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#endif
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}
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static int
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dgram_read(BIO *b, char *out, int outl)
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{
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int ret = 0;
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bio_dgram_data *data = (bio_dgram_data *)b->ptr;
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struct {
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socklen_t len;
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union {
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struct sockaddr sa;
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struct sockaddr_in sa_in;
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struct sockaddr_in6 sa_in6;
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} peer;
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} sa;
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sa.len = sizeof(sa.peer);
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if (out != NULL) {
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errno = 0;
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memset(&sa.peer, 0, sizeof(sa.peer));
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dgram_adjust_rcv_timeout(b);
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ret = recvfrom(b->num, out, outl, 0, &sa.peer.sa, &sa.len);
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if (! data->connected && ret >= 0)
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BIO_ctrl(b, BIO_CTRL_DGRAM_SET_PEER, 0, &sa.peer);
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BIO_clear_retry_flags(b);
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if (ret < 0) {
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if (BIO_dgram_should_retry(ret)) {
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BIO_set_retry_read(b);
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data->_errno = errno;
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}
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}
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dgram_reset_rcv_timeout(b);
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}
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return (ret);
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}
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static int
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dgram_write(BIO *b, const char *in, int inl)
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{
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int ret;
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bio_dgram_data *data = (bio_dgram_data *)b->ptr;
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errno = 0;
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if (data->connected)
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ret = write(b->num, in, inl);
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else {
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int peerlen = sizeof(data->peer);
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if (data->peer.sa.sa_family == AF_INET)
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peerlen = sizeof(data->peer.sa_in);
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else if (data->peer.sa.sa_family == AF_INET6)
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peerlen = sizeof(data->peer.sa_in6);
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ret = sendto(b->num, in, inl, 0, &data->peer.sa, peerlen);
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}
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BIO_clear_retry_flags(b);
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if (ret <= 0) {
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if (BIO_dgram_should_retry(ret)) {
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BIO_set_retry_write(b);
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data->_errno = errno;
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/*
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* higher layers are responsible for querying MTU,
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* if necessary
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*/
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}
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}
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return (ret);
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}
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static long
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dgram_ctrl(BIO *b, int cmd, long num, void *ptr)
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{
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long ret = 1;
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int *ip;
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struct sockaddr *to = NULL;
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bio_dgram_data *data = NULL;
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#if (defined(IP_MTU_DISCOVER) || defined(IP_MTU))
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int sockopt_val = 0;
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socklen_t sockopt_len; /* assume that system supporting IP_MTU is
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* modern enough to define socklen_t */
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socklen_t addr_len;
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union {
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struct sockaddr sa;
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struct sockaddr_in s4;
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struct sockaddr_in6 s6;
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} addr;
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#endif
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data = (bio_dgram_data *)b->ptr;
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switch (cmd) {
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case BIO_CTRL_RESET:
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num = 0;
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case BIO_C_FILE_SEEK:
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ret = 0;
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break;
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case BIO_C_FILE_TELL:
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case BIO_CTRL_INFO:
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ret = 0;
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break;
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case BIO_C_SET_FD:
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dgram_clear(b);
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b->num= *((int *)ptr);
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b->shutdown = (int)num;
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b->init = 1;
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break;
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case BIO_C_GET_FD:
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if (b->init) {
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ip = (int *)ptr;
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if (ip != NULL)
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*ip = b->num;
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ret = b->num;
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} else
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ret = -1;
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break;
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case BIO_CTRL_GET_CLOSE:
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ret = b->shutdown;
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break;
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case BIO_CTRL_SET_CLOSE:
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b->shutdown = (int)num;
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break;
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case BIO_CTRL_PENDING:
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case BIO_CTRL_WPENDING:
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ret = 0;
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break;
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case BIO_CTRL_DUP:
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case BIO_CTRL_FLUSH:
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ret = 1;
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break;
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case BIO_CTRL_DGRAM_CONNECT:
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to = (struct sockaddr *)ptr;
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switch (to->sa_family) {
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case AF_INET:
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memcpy(&data->peer, to, sizeof(data->peer.sa_in));
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break;
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case AF_INET6:
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memcpy(&data->peer, to, sizeof(data->peer.sa_in6));
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break;
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default:
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memcpy(&data->peer, to, sizeof(data->peer.sa));
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break;
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}
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break;
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/* (Linux)kernel sets DF bit on outgoing IP packets */
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case BIO_CTRL_DGRAM_MTU_DISCOVER:
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#if defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DO)
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addr_len = (socklen_t)sizeof(addr);
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memset((void *)&addr, 0, sizeof(addr));
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if (getsockname(b->num, &addr.sa, &addr_len) < 0) {
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ret = 0;
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break;
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}
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switch (addr.sa.sa_family) {
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case AF_INET:
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sockopt_val = IP_PMTUDISC_DO;
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ret = setsockopt(b->num, IPPROTO_IP, IP_MTU_DISCOVER,
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&sockopt_val, sizeof(sockopt_val));
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if (ret < 0)
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perror("setsockopt");
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break;
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#if defined(IPV6_MTU_DISCOVER) && defined(IPV6_PMTUDISC_DO)
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case AF_INET6:
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sockopt_val = IPV6_PMTUDISC_DO;
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ret = setsockopt(b->num, IPPROTO_IPV6,
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IPV6_MTU_DISCOVER, &sockopt_val,
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sizeof(sockopt_val));
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if (ret < 0)
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perror("setsockopt");
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break;
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#endif
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default:
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ret = -1;
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break;
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}
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#else
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ret = -1;
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#endif
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break;
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case BIO_CTRL_DGRAM_QUERY_MTU:
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#if defined(IP_MTU)
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addr_len = (socklen_t)sizeof(addr);
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memset((void *)&addr, 0, sizeof(addr));
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if (getsockname(b->num, &addr.sa, &addr_len) < 0) {
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ret = 0;
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break;
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}
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sockopt_len = sizeof(sockopt_val);
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switch (addr.sa.sa_family) {
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case AF_INET:
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ret = getsockopt(b->num, IPPROTO_IP, IP_MTU,
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&sockopt_val, &sockopt_len);
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if (ret < 0 || sockopt_val < 0) {
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ret = 0;
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} else {
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/* we assume that the transport protocol is UDP and no
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* IP options are used.
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*/
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data->mtu = sockopt_val - 8 - 20;
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ret = data->mtu;
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}
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break;
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#if defined(IPV6_MTU)
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case AF_INET6:
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ret = getsockopt(b->num, IPPROTO_IPV6, IPV6_MTU,
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&sockopt_val, &sockopt_len);
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if (ret < 0 || sockopt_val < 0) {
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ret = 0;
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} else {
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/* we assume that the transport protocol is UDP and no
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* IPV6 options are used.
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*/
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data->mtu = sockopt_val - 8 - 40;
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ret = data->mtu;
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}
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break;
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#endif
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default:
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ret = 0;
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break;
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}
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#else
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ret = 0;
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#endif
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break;
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case BIO_CTRL_DGRAM_GET_FALLBACK_MTU:
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switch (data->peer.sa.sa_family) {
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case AF_INET:
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ret = 576 - 20 - 8;
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break;
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case AF_INET6:
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#ifdef IN6_IS_ADDR_V4MAPPED
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if (IN6_IS_ADDR_V4MAPPED(&data->peer.sa_in6.sin6_addr))
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ret = 576 - 20 - 8;
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else
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#endif
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ret = 1280 - 40 - 8;
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break;
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default:
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ret = 576 - 20 - 8;
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break;
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}
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break;
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case BIO_CTRL_DGRAM_GET_MTU:
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return data->mtu;
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break;
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case BIO_CTRL_DGRAM_SET_MTU:
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data->mtu = num;
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ret = num;
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break;
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case BIO_CTRL_DGRAM_SET_CONNECTED:
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to = (struct sockaddr *)ptr;
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if (to != NULL) {
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data->connected = 1;
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switch (to->sa_family) {
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case AF_INET:
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memcpy(&data->peer, to, sizeof(data->peer.sa_in));
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break;
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case AF_INET6:
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memcpy(&data->peer, to, sizeof(data->peer.sa_in6));
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break;
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default:
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memcpy(&data->peer, to, sizeof(data->peer.sa));
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break;
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}
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} else {
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data->connected = 0;
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memset(&(data->peer), 0, sizeof(data->peer));
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}
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break;
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case BIO_CTRL_DGRAM_GET_PEER:
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switch (data->peer.sa.sa_family) {
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case AF_INET:
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ret = sizeof(data->peer.sa_in);
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break;
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case AF_INET6:
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ret = sizeof(data->peer.sa_in6);
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break;
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default:
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ret = sizeof(data->peer.sa);
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break;
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|
}
|
|
if (num == 0 || num > ret)
|
|
num = ret;
|
|
memcpy(ptr, &data->peer, (ret = num));
|
|
break;
|
|
case BIO_CTRL_DGRAM_SET_PEER:
|
|
to = (struct sockaddr *) ptr;
|
|
switch (to->sa_family) {
|
|
case AF_INET:
|
|
memcpy(&data->peer, to, sizeof(data->peer.sa_in));
|
|
break;
|
|
case AF_INET6:
|
|
memcpy(&data->peer, to, sizeof(data->peer.sa_in6));
|
|
break;
|
|
default:
|
|
memcpy(&data->peer, to, sizeof(data->peer.sa));
|
|
break;
|
|
}
|
|
break;
|
|
case BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT:
|
|
memcpy(&(data->next_timeout), ptr, sizeof(struct timeval));
|
|
break;
|
|
#if defined(SO_RCVTIMEO)
|
|
case BIO_CTRL_DGRAM_SET_RECV_TIMEOUT:
|
|
if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, ptr,
|
|
sizeof(struct timeval)) < 0) {
|
|
perror("setsockopt");
|
|
ret = -1;
|
|
}
|
|
break;
|
|
case BIO_CTRL_DGRAM_GET_RECV_TIMEOUT:
|
|
{
|
|
socklen_t sz = sizeof(struct timeval);
|
|
if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
|
|
ptr, &sz) < 0) {
|
|
perror("getsockopt");
|
|
ret = -1;
|
|
} else
|
|
ret = sz;
|
|
}
|
|
break;
|
|
#endif
|
|
#if defined(SO_SNDTIMEO)
|
|
case BIO_CTRL_DGRAM_SET_SEND_TIMEOUT:
|
|
if (setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO, ptr,
|
|
sizeof(struct timeval)) < 0) {
|
|
perror("setsockopt");
|
|
ret = -1;
|
|
}
|
|
break;
|
|
case BIO_CTRL_DGRAM_GET_SEND_TIMEOUT:
|
|
{
|
|
socklen_t sz = sizeof(struct timeval);
|
|
if (getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
|
|
ptr, &sz) < 0) {
|
|
perror("getsockopt");
|
|
ret = -1;
|
|
} else
|
|
ret = sz;
|
|
}
|
|
break;
|
|
#endif
|
|
case BIO_CTRL_DGRAM_GET_SEND_TIMER_EXP:
|
|
/* fall-through */
|
|
case BIO_CTRL_DGRAM_GET_RECV_TIMER_EXP:
|
|
if (data->_errno == EAGAIN) {
|
|
ret = 1;
|
|
data->_errno = 0;
|
|
} else
|
|
ret = 0;
|
|
break;
|
|
#ifdef EMSGSIZE
|
|
case BIO_CTRL_DGRAM_MTU_EXCEEDED:
|
|
if (data->_errno == EMSGSIZE) {
|
|
ret = 1;
|
|
data->_errno = 0;
|
|
} else
|
|
ret = 0;
|
|
break;
|
|
#endif
|
|
default:
|
|
ret = 0;
|
|
break;
|
|
}
|
|
return (ret);
|
|
}
|
|
|
|
static int
|
|
dgram_puts(BIO *bp, const char *str)
|
|
{
|
|
int n, ret;
|
|
|
|
n = strlen(str);
|
|
ret = dgram_write(bp, str, n);
|
|
return (ret);
|
|
}
|
|
|
|
|
|
static int
|
|
BIO_dgram_should_retry(int i)
|
|
{
|
|
int err;
|
|
|
|
if ((i == 0) || (i == -1)) {
|
|
err = errno;
|
|
return (BIO_dgram_non_fatal_error(err));
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
BIO_dgram_non_fatal_error(int err)
|
|
{
|
|
switch (err) {
|
|
case EINTR:
|
|
case EAGAIN:
|
|
case EINPROGRESS:
|
|
case EALREADY:
|
|
return (1);
|
|
default:
|
|
break;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
#endif
|