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openssl/crypto/bio/bss_dgram.c

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/* crypto/bio/bio_dgram.c */
/*
* DTLS implementation written by Nagendra Modadugu
* (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
*/
/* ====================================================================
* Copyright (c) 1999-2005 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@OpenSSL.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
#ifndef OPENSSL_NO_DGRAM
#include <stdio.h>
#include <errno.h>
#define USE_SOCKETS
#include "cryptlib.h"
#include <openssl/bio.h>
#define IP_MTU 14 /* linux is lame */
#ifdef WATT32
#define sock_write SockWrite /* Watt-32 uses same names */
#define sock_read SockRead
#define sock_puts SockPuts
#endif
static int dgram_write(BIO *h, const char *buf, int num);
static int dgram_read(BIO *h, char *buf, int size);
static int dgram_puts(BIO *h, const char *str);
static long dgram_ctrl(BIO *h, int cmd, long arg1, void *arg2);
static int dgram_new(BIO *h);
static int dgram_free(BIO *data);
static int dgram_clear(BIO *bio);
static int BIO_dgram_should_retry(int s);
static BIO_METHOD methods_dgramp=
{
BIO_TYPE_DGRAM,
"datagram socket",
dgram_write,
dgram_read,
dgram_puts,
NULL, /* dgram_gets, */
dgram_ctrl,
dgram_new,
dgram_free,
NULL,
};
typedef struct bio_dgram_data_st
{
struct sockaddr peer;
unsigned int connected;
unsigned int _errno;
unsigned int mtu;
} bio_dgram_data;
BIO_METHOD *BIO_s_datagram(void)
{
return(&methods_dgramp);
}
BIO *BIO_new_dgram(int fd, int close_flag)
{
BIO *ret;
ret=BIO_new(BIO_s_datagram());
if (ret == NULL) return(NULL);
BIO_set_fd(ret,fd,close_flag);
return(ret);
}
static int dgram_new(BIO *bi)
{
bio_dgram_data *data = NULL;
bi->init=0;
bi->num=0;
data = OPENSSL_malloc(sizeof(bio_dgram_data));
if (data == NULL)
return 0;
memset(data, 0x00, sizeof(bio_dgram_data));
bi->ptr = data;
bi->flags=0;
return(1);
}
static int dgram_free(BIO *a)
{
bio_dgram_data *data;
if (a == NULL) return(0);
if ( ! dgram_clear(a))
return 0;
data = (bio_dgram_data *)a->ptr;
if(data != NULL) OPENSSL_free(data);
return(1);
}
static int dgram_clear(BIO *a)
{
if (a == NULL) return(0);
if (a->shutdown)
{
if (a->init)
{
SHUTDOWN2(a->num);
}
a->init=0;
a->flags=0;
}
return(1);
}
static int dgram_read(BIO *b, char *out, int outl)
{
int ret=0;
bio_dgram_data *data = (bio_dgram_data *)b->ptr;
struct sockaddr peer;
int peerlen = sizeof(peer);
if (out != NULL)
{
clear_socket_error();
memset(&peer, 0x00, peerlen);
/* Last arg in recvfrom is signed on some platforms and
* unsigned on others. It is of type socklen_t on some
* but this is not universal. Cast to (void *) to avoid
* compiler warnings.
*/
ret=recvfrom(b->num,out,outl,0,&peer,(void *)&peerlen);
if ( ! data->connected && ret > 0)
BIO_ctrl(b, BIO_CTRL_DGRAM_CONNECT, 0, &peer);
BIO_clear_retry_flags(b);
if (ret <= 0)
{
if (BIO_dgram_should_retry(ret))
{
BIO_set_retry_read(b);
data->_errno = get_last_socket_error();
}
}
}
return(ret);
}
static int dgram_write(BIO *b, const char *in, int inl)
{
int ret;
bio_dgram_data *data = (bio_dgram_data *)b->ptr;
clear_socket_error();
if ( data->connected )
ret=send(b->num,in,inl,0);
else
ret=sendto(b->num, in, inl, 0, &data->peer, sizeof(data->peer));
BIO_clear_retry_flags(b);
if (ret <= 0)
{
if (BIO_sock_should_retry(ret))
{
BIO_set_retry_write(b);
data->_errno = get_last_socket_error();
#if 0 /* higher layers are responsible for querying MTU, if necessary */
if ( data->_errno == EMSGSIZE)
/* retrieve the new MTU */
BIO_ctrl(b, BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
#endif
}
}
return(ret);
}
static long dgram_ctrl(BIO *b, int cmd, long num, void *ptr)
{
long ret=1;
int *ip;
struct sockaddr *to = NULL;
bio_dgram_data *data = NULL;
long sockopt_val = 0;
unsigned int sockopt_len = 0;
data = (bio_dgram_data *)b->ptr;
switch (cmd)
{
case BIO_CTRL_RESET:
num=0;
case BIO_C_FILE_SEEK:
ret=0;
break;
case BIO_C_FILE_TELL:
case BIO_CTRL_INFO:
ret=0;
break;
case BIO_C_SET_FD:
dgram_clear(b);
b->num= *((int *)ptr);
b->shutdown=(int)num;
b->init=1;
break;
case BIO_C_GET_FD:
if (b->init)
{
ip=(int *)ptr;
if (ip != NULL) *ip=b->num;
ret=b->num;
}
else
ret= -1;
break;
case BIO_CTRL_GET_CLOSE:
ret=b->shutdown;
break;
case BIO_CTRL_SET_CLOSE:
b->shutdown=(int)num;
break;
case BIO_CTRL_PENDING:
case BIO_CTRL_WPENDING:
ret=0;
break;
case BIO_CTRL_DUP:
case BIO_CTRL_FLUSH:
ret=1;
break;
case BIO_CTRL_DGRAM_CONNECT:
to = (struct sockaddr *)ptr;
#if 0
if (connect(b->num, to, sizeof(struct sockaddr)) < 0)
{ perror("connect"); ret = 0; }
else
{
#endif
memcpy(&(data->peer),to, sizeof(struct sockaddr));
#if 0
}
#endif
break;
/* (Linux)kernel sets DF bit on outgoing IP packets */
#ifdef IP_MTU_DISCOVER
case BIO_CTRL_DGRAM_MTU_DISCOVER:
sockopt_val = IP_PMTUDISC_DO;
if ((ret = setsockopt(b->num, IPPROTO_IP, IP_MTU_DISCOVER,
&sockopt_val, sizeof(sockopt_val))) < 0)
perror("setsockopt");
break;
#endif
case BIO_CTRL_DGRAM_QUERY_MTU:
sockopt_len = sizeof(sockopt_val);
if ((ret = getsockopt(b->num, IPPROTO_IP, IP_MTU, (void *)&sockopt_val,
&sockopt_len)) < 0 || sockopt_val < 0)
{ ret = 0; }
else
{
data->mtu = sockopt_val;
ret = data->mtu;
}
break;
case BIO_CTRL_DGRAM_GET_MTU:
return data->mtu;
break;
case BIO_CTRL_DGRAM_SET_MTU:
data->mtu = num;
ret = num;
break;
case BIO_CTRL_DGRAM_SET_CONNECTED:
to = (struct sockaddr *)ptr;
if ( to != NULL)
{
data->connected = 1;
memcpy(&(data->peer),to, sizeof(struct sockaddr));
}
else
{
data->connected = 0;
memset(&(data->peer), 0x00, sizeof(struct sockaddr));
}
break;
case BIO_CTRL_DGRAM_SET_PEER:
to = (struct sockaddr *) ptr;
memcpy(&(data->peer), to, sizeof(struct sockaddr));
break;
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:
if ( getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
ptr, (void *)&ret) < 0)
{ perror("getsockopt"); ret = -1; }
break;
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:
if ( getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
ptr, (void *)&ret) < 0)
{ perror("getsockopt"); ret = -1; }
break;
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=get_last_socket_error();
#if defined(OPENSSL_SYS_WINDOWS) && 0 /* more microsoft stupidity? perhaps not? Ben 4/1/99 */
if ((i == -1) && (err == 0))
return(1);
#endif
return(BIO_dgram_non_fatal_error(err));
}
return(0);
}
int BIO_dgram_non_fatal_error(int err)
{
switch (err)
{
#if defined(OPENSSL_SYS_WINDOWS)
# if defined(WSAEWOULDBLOCK)
case WSAEWOULDBLOCK:
# endif
# if 0 /* This appears to always be an error */
# if defined(WSAENOTCONN)
case WSAENOTCONN:
# endif
# endif
#endif
#ifdef EWOULDBLOCK
# ifdef WSAEWOULDBLOCK
# if WSAEWOULDBLOCK != EWOULDBLOCK
case EWOULDBLOCK:
# endif
# else
case EWOULDBLOCK:
# endif
#endif
#if defined(ENOTCONN)
case ENOTCONN:
#endif
#ifdef EINTR
case EINTR:
#endif
#ifdef EAGAIN
#if EWOULDBLOCK != EAGAIN
case EAGAIN:
# endif
#endif
#ifdef EPROTO
case EPROTO:
#endif
#ifdef EINPROGRESS
case EINPROGRESS:
#endif
#ifdef EALREADY
case EALREADY:
#endif
/* DF bit set, and packet larger than MTU */
#ifdef EMSGSIZE
case EMSGSIZE:
#endif
return(1);
/* break; */
default:
break;
}
return(0);
}
#endif
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