488 lines
11 KiB
C
488 lines
11 KiB
C
/* crypto/bio/bio_dgram.c */
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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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#ifndef OPENSSL_NO_DGRAM
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#include <stdio.h>
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#include <errno.h>
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#define USE_SOCKETS
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#include "cryptlib.h"
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#include <openssl/bio.h>
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#define IP_MTU 14 /* linux is lame */
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#ifdef WATT32
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#define sock_write SockWrite /* Watt-32 uses same names */
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#define sock_read SockRead
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#define sock_puts SockPuts
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#endif
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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 BIO_METHOD methods_dgramp=
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{
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BIO_TYPE_DGRAM,
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"datagram socket",
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dgram_write,
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dgram_read,
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dgram_puts,
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NULL, /* dgram_gets, */
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dgram_ctrl,
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dgram_new,
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dgram_free,
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NULL,
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};
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typedef struct bio_dgram_data_st
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{
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struct sockaddr 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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} bio_dgram_data;
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BIO_METHOD *BIO_s_datagram(void)
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{
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return(&methods_dgramp);
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}
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BIO *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) 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 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 = OPENSSL_malloc(sizeof(bio_dgram_data));
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if (data == NULL)
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return 0;
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memset(data, 0x00, sizeof(bio_dgram_data));
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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 dgram_free(BIO *a)
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{
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bio_dgram_data *data;
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if (a == NULL) 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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if(data != NULL) OPENSSL_free(data);
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return(1);
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}
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static int dgram_clear(BIO *a)
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{
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if (a == NULL) return(0);
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if (a->shutdown)
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{
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if (a->init)
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{
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SHUTDOWN2(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 int 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 sockaddr peer;
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int peerlen = sizeof(peer);
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if (out != NULL)
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{
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clear_socket_error();
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memset(&peer, 0x00, peerlen);
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/* Last arg in recvfrom is signed on some platforms and
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* unsigned on others. It is of type socklen_t on some
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* but this is not universal. Cast to (void *) to avoid
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* compiler warnings.
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*/
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ret=recvfrom(b->num,out,outl,0,&peer,(void *)&peerlen);
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if ( ! data->connected && ret > 0)
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BIO_ctrl(b, BIO_CTRL_DGRAM_CONNECT, 0, &peer);
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BIO_clear_retry_flags(b);
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if (ret <= 0)
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{
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if (BIO_dgram_should_retry(ret))
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{
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BIO_set_retry_read(b);
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data->_errno = get_last_socket_error();
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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 int 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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clear_socket_error();
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if ( data->connected )
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ret=send(b->num,in,inl,0);
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else
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ret=sendto(b->num, in, inl, 0, &data->peer, sizeof(data->peer));
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BIO_clear_retry_flags(b);
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if (ret <= 0)
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{
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if (BIO_sock_should_retry(ret))
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{
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BIO_set_retry_write(b);
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data->_errno = get_last_socket_error();
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#if 0 /* higher layers are responsible for querying MTU, if necessary */
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if ( data->_errno == EMSGSIZE)
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/* retrieve the new MTU */
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BIO_ctrl(b, BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
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#endif
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}
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}
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return(ret);
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}
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static long 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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long sockopt_val = 0;
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unsigned int sockopt_len = 0;
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data = (bio_dgram_data *)b->ptr;
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switch (cmd)
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{
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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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{
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ip=(int *)ptr;
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if (ip != NULL) *ip=b->num;
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ret=b->num;
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}
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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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#if 0
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if (connect(b->num, to, sizeof(struct sockaddr)) < 0)
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{ perror("connect"); ret = 0; }
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else
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{
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#endif
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memcpy(&(data->peer),to, sizeof(struct sockaddr));
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#if 0
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}
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#endif
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break;
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/* (Linux)kernel sets DF bit on outgoing IP packets */
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#ifdef IP_MTU_DISCOVER
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case BIO_CTRL_DGRAM_MTU_DISCOVER:
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sockopt_val = IP_PMTUDISC_DO;
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if ((ret = setsockopt(b->num, IPPROTO_IP, IP_MTU_DISCOVER,
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&sockopt_val, sizeof(sockopt_val))) < 0)
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perror("setsockopt");
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break;
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#endif
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case BIO_CTRL_DGRAM_QUERY_MTU:
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sockopt_len = sizeof(sockopt_val);
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if ((ret = getsockopt(b->num, IPPROTO_IP, IP_MTU, (void *)&sockopt_val,
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&sockopt_len)) < 0 || sockopt_val < 0)
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{ ret = 0; }
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else
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{
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data->mtu = sockopt_val;
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ret = data->mtu;
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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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{
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data->connected = 1;
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memcpy(&(data->peer),to, sizeof(struct sockaddr));
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}
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else
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{
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data->connected = 0;
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memset(&(data->peer), 0x00, sizeof(struct sockaddr));
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}
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break;
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case BIO_CTRL_DGRAM_SET_PEER:
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to = (struct sockaddr *) ptr;
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memcpy(&(data->peer), to, sizeof(struct sockaddr));
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break;
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#if defined(SO_RCVTIMEO)
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case BIO_CTRL_DGRAM_SET_RECV_TIMEOUT:
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if ( setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, ptr,
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sizeof(struct timeval)) < 0)
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{ perror("setsockopt"); ret = -1; }
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break;
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case BIO_CTRL_DGRAM_GET_RECV_TIMEOUT:
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if ( getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
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ptr, (void *)&ret) < 0)
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{ perror("getsockopt"); ret = -1; }
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break;
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#endif
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#if defined(SO_SNDTIMEO)
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case BIO_CTRL_DGRAM_SET_SEND_TIMEOUT:
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if ( setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO, ptr,
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sizeof(struct timeval)) < 0)
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{ perror("setsockopt"); ret = -1; }
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break;
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case BIO_CTRL_DGRAM_GET_SEND_TIMEOUT:
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if ( getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
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ptr, (void *)&ret) < 0)
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{ perror("getsockopt"); ret = -1; }
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break;
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#endif
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case BIO_CTRL_DGRAM_GET_SEND_TIMER_EXP:
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/* fall-through */
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case BIO_CTRL_DGRAM_GET_RECV_TIMER_EXP:
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if ( data->_errno == EAGAIN)
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{
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ret = 1;
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data->_errno = 0;
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}
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else
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ret = 0;
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break;
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#ifdef EMSGSIZE
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case BIO_CTRL_DGRAM_MTU_EXCEEDED:
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if ( data->_errno == EMSGSIZE)
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{
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ret = 1;
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data->_errno = 0;
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}
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else
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ret = 0;
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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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return(ret);
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}
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static int dgram_puts(BIO *bp, const char *str)
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{
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int n,ret;
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n=strlen(str);
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ret=dgram_write(bp,str,n);
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return(ret);
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}
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static int BIO_dgram_should_retry(int i)
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{
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int err;
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if ((i == 0) || (i == -1))
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{
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err=get_last_socket_error();
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#if defined(OPENSSL_SYS_WINDOWS) && 0 /* more microsoft stupidity? perhaps not? Ben 4/1/99 */
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if ((i == -1) && (err == 0))
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return(1);
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#endif
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return(BIO_dgram_non_fatal_error(err));
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}
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return(0);
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}
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int BIO_dgram_non_fatal_error(int err)
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{
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switch (err)
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{
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#if defined(OPENSSL_SYS_WINDOWS)
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# if defined(WSAEWOULDBLOCK)
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case WSAEWOULDBLOCK:
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# endif
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# if 0 /* This appears to always be an error */
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# if defined(WSAENOTCONN)
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case WSAENOTCONN:
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# endif
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# endif
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#endif
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#ifdef EWOULDBLOCK
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# ifdef WSAEWOULDBLOCK
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# if WSAEWOULDBLOCK != EWOULDBLOCK
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case EWOULDBLOCK:
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# endif
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# else
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case EWOULDBLOCK:
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# endif
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#endif
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#if defined(ENOTCONN)
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case ENOTCONN:
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#endif
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#ifdef EINTR
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case EINTR:
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#endif
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#ifdef EAGAIN
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#if EWOULDBLOCK != EAGAIN
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case EAGAIN:
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# endif
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#endif
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#ifdef EPROTO
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case EPROTO:
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#endif
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#ifdef EINPROGRESS
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case EINPROGRESS:
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#endif
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#ifdef EALREADY
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case EALREADY:
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#endif
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/* DF bit set, and packet larger than MTU */
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#ifdef EMSGSIZE
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case EMSGSIZE:
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#endif
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return(1);
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/* break; */
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default:
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break;
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}
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return(0);
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}
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#endif
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