bss_acpt.c

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/* crypto/bio/bss_acpt.c */
/* Copyright (C) 1995-1998 Eric Young ([email protected])
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young ([email protected]).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson ([email protected]).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * 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 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 acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young ([email protected])"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson ([email protected])"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS 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 AUTHOR OR 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.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>
#include <errno.h>
#define USE_SOCKETS
#include "cryptlib.h"
#include <openssl/bio.h>

#ifndef OPENSSL_NO_SOCK

#ifdef OPENSSL_SYS_WIN16
#define SOCKET_PROTOCOL 0 /* more microsoft stupidity */
#else
#define SOCKET_PROTOCOL IPPROTO_TCP
#endif

#if (defined(OPENSSL_SYS_VMS) && __VMS_VER < 70000000)
/* FIONBIO used as a switch to enable ioctl, and that isn't in VMS < 7.0 */
#undef FIONBIO
#endif

typedef struct bio_accept_st
    {
    int state;
    char *param_addr;

    int accept_sock;
    int accept_nbio;

    char *addr;
    int nbio;
    /* If 0, it means normal, if 1, do a connect on bind failure,
     * and if there is no-one listening, bind with SO_REUSEADDR.
     * If 2, always use SO_REUSEADDR. */
    int bind_mode;
    BIO *bio_chain;
    } BIO_ACCEPT;

static int acpt_write(BIO *h, const char *buf, int num);
static int acpt_read(BIO *h, char *buf, int size);
static int acpt_puts(BIO *h, const char *str);
static long acpt_ctrl(BIO *h, int cmd, long arg1, void *arg2);
static int acpt_new(BIO *h);
static int acpt_free(BIO *data);
static int acpt_state(BIO *b, BIO_ACCEPT *c);
static void acpt_close_socket(BIO *data);
static BIO_ACCEPT *BIO_ACCEPT_new(void );
static void BIO_ACCEPT_free(BIO_ACCEPT *a);

#define ACPT_S_BEFORE           1
#define ACPT_S_GET_ACCEPT_SOCKET    2
#define ACPT_S_OK           3

static BIO_METHOD methods_acceptp=
    {
    BIO_TYPE_ACCEPT,
    "socket accept",
    acpt_write,
    acpt_read,
    acpt_puts,
    NULL, /* connect_gets, */
    acpt_ctrl,
    acpt_new,
    acpt_free,
    NULL,
    };

BIO_METHOD *BIO_s_accept(void)
    {
    return(&methods_acceptp);
    }

static int acpt_new(BIO *bi)
    {
    BIO_ACCEPT *ba;

    bi->init=0;
    bi->num=INVALID_SOCKET;
    bi->flags=0;
    if ((ba=BIO_ACCEPT_new()) == NULL)
        return(0);
    bi->ptr=(char *)ba;
    ba->state=ACPT_S_BEFORE;
    bi->shutdown=1;
    return(1);
    }

static BIO_ACCEPT *BIO_ACCEPT_new(void)
    {
    BIO_ACCEPT *ret;

    if ((ret=(BIO_ACCEPT *)OPENSSL_malloc(sizeof(BIO_ACCEPT))) == NULL)
        return(NULL);

    memset(ret,0,sizeof(BIO_ACCEPT));
    ret->accept_sock=INVALID_SOCKET;
    ret->bind_mode=BIO_BIND_NORMAL;
    return(ret);
    }

static void BIO_ACCEPT_free(BIO_ACCEPT *a)
    {
    if(a == NULL)
        return;

    if (a->param_addr != NULL) OPENSSL_free(a->param_addr);
    if (a->addr != NULL) OPENSSL_free(a->addr);
    if (a->bio_chain != NULL) BIO_free(a->bio_chain);
    OPENSSL_free(a);
    }

static void acpt_close_socket(BIO *bio)
    {
    BIO_ACCEPT *c;

    c=(BIO_ACCEPT *)bio->ptr;
    if (c->accept_sock != INVALID_SOCKET)
        {
        shutdown(c->accept_sock,2);
        closesocket(c->accept_sock);
        c->accept_sock=INVALID_SOCKET;
        bio->num=INVALID_SOCKET;
        }
    }

static int acpt_free(BIO *a)
    {
    BIO_ACCEPT *data;

    if (a == NULL) return(0);
    data=(BIO_ACCEPT *)a->ptr;
     
    if (a->shutdown)
        {
        acpt_close_socket(a);
        BIO_ACCEPT_free(data);
        a->ptr=NULL;
        a->flags=0;
        a->init=0;
        }
    return(1);
    }
    
static int acpt_state(BIO *b, BIO_ACCEPT *c)
    {
    BIO *bio=NULL,*dbio;
    int s= -1;
    int i;

again:
    switch (c->state)
        {
    case ACPT_S_BEFORE:
        if (c->param_addr == NULL)
            {
            BIOerr(BIO_F_ACPT_STATE,BIO_R_NO_ACCEPT_PORT_SPECIFIED);
            return(-1);
            }
        s=BIO_get_accept_socket(c->param_addr,c->bind_mode);
        if (s == INVALID_SOCKET)
            return(-1);

        if (c->accept_nbio)
            {
            if (!BIO_socket_nbio(s,1))
                {
                closesocket(s);
                BIOerr(BIO_F_ACPT_STATE,BIO_R_ERROR_SETTING_NBIO_ON_ACCEPT_SOCKET);
                return(-1);
                }
            }
        c->accept_sock=s;
        b->num=s;
        c->state=ACPT_S_GET_ACCEPT_SOCKET;
        return(1);
        /* break; */
    case ACPT_S_GET_ACCEPT_SOCKET:
        if (b->next_bio != NULL)
            {
            c->state=ACPT_S_OK;
            goto again;
            }
        BIO_clear_retry_flags(b);
        b->retry_reason=0;
        i=BIO_accept(c->accept_sock,&(c->addr));

        /* -2 return means we should retry */
        if(i == -2)
            {
            BIO_set_retry_special(b);
            b->retry_reason=BIO_RR_ACCEPT;
            return -1;
            }

        if (i < 0) return(i);

        bio=BIO_new_socket(i,BIO_CLOSE);
        if (bio == NULL) goto err;

        BIO_set_callback(bio,BIO_get_callback(b));
        BIO_set_callback_arg(bio,BIO_get_callback_arg(b));

        if (c->nbio)
            {
            if (!BIO_socket_nbio(i,1))
                {
                BIOerr(BIO_F_ACPT_STATE,BIO_R_ERROR_SETTING_NBIO_ON_ACCEPTED_SOCKET);
                goto err;
                }
            }

        /* If the accept BIO has an bio_chain, we dup it and
         * put the new socket at the end. */
        if (c->bio_chain != NULL)
            {
            if ((dbio=BIO_dup_chain(c->bio_chain)) == NULL)
                goto err;
            if (!BIO_push(dbio,bio)) goto err;
            bio=dbio;
            }
        if (BIO_push(b,bio) == NULL) goto err;

        c->state=ACPT_S_OK;
        return(1);
err:
        if (bio != NULL)
            BIO_free(bio);
        else if (s >= 0)
            closesocket(s);
        return(0);
        /* break; */
    case ACPT_S_OK:
        if (b->next_bio == NULL)
            {
            c->state=ACPT_S_GET_ACCEPT_SOCKET;
            goto again;
            }
        return(1);
        /* break; */
    default:    
        return(0);
        /* break; */
        }

    }

static int acpt_read(BIO *b, char *out, int outl)
    {
    int ret=0;
    BIO_ACCEPT *data;

    BIO_clear_retry_flags(b);
    data=(BIO_ACCEPT *)b->ptr;

    while (b->next_bio == NULL)
        {
        ret=acpt_state(b,data);
        if (ret <= 0) return(ret);
        }

    ret=BIO_read(b->next_bio,out,outl);
    BIO_copy_next_retry(b);
    return(ret);
    }

static int acpt_write(BIO *b, const char *in, int inl)
    {
    int ret;
    BIO_ACCEPT *data;

    BIO_clear_retry_flags(b);
    data=(BIO_ACCEPT *)b->ptr;

    while (b->next_bio == NULL)
        {
        ret=acpt_state(b,data);
        if (ret <= 0) return(ret);
        }

    ret=BIO_write(b->next_bio,in,inl);
    BIO_copy_next_retry(b);
    return(ret);
    }

static long acpt_ctrl(BIO *b, int cmd, long num, void *ptr)
    {
    int *ip;
    long ret=1;
    BIO_ACCEPT *data;
    char **pp;

    data=(BIO_ACCEPT *)b->ptr;

    switch (cmd)
        {
    case BIO_CTRL_RESET:
        ret=0;
        data->state=ACPT_S_BEFORE;
        acpt_close_socket(b);
        b->flags=0;
        break;
    case BIO_C_DO_STATE_MACHINE:
        /* use this one to start the connection */
        ret=(long)acpt_state(b,data);
        break;
    case BIO_C_SET_ACCEPT:
        if (ptr != NULL)
            {
            if (num == 0)
                {
                b->init=1;
                if (data->param_addr != NULL)
                    OPENSSL_free(data->param_addr);
                data->param_addr=BUF_strdup(ptr);
                }
            else if (num == 1)
                {
                data->accept_nbio=(ptr != NULL);
                }
            else if (num == 2)
                {
                if (data->bio_chain != NULL)
                    BIO_free(data->bio_chain);
                data->bio_chain=(BIO *)ptr;
                }
            }
        break;
    case BIO_C_SET_NBIO:
        data->nbio=(int)num;
        break;
    case BIO_C_SET_FD:
        b->init=1;
        b->num= *((int *)ptr);
        data->accept_sock=b->num;
        data->state=ACPT_S_GET_ACCEPT_SOCKET;
        b->shutdown=(int)num;
        b->init=1;
        break;
    case BIO_C_GET_FD:
        if (b->init)
            {
            ip=(int *)ptr;
            if (ip != NULL)
                *ip=data->accept_sock;
            ret=data->accept_sock;
            }
        else
            ret= -1;
        break;
    case BIO_C_GET_ACCEPT:
        if (b->init)
            {
            if (ptr != NULL)
                {
                pp=(char **)ptr;
                *pp=data->param_addr;
                }
            else
                ret= -1;
            }
        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_FLUSH:
        break;
    case BIO_C_SET_BIND_MODE:
        data->bind_mode=(int)num;
        break;
    case BIO_C_GET_BIND_MODE:
        ret=(long)data->bind_mode;
        break;
    case BIO_CTRL_DUP:
/*      dbio=(BIO *)ptr;
        if (data->param_port) EAY EAY
            BIO_set_port(dbio,data->param_port);
        if (data->param_hostname)
            BIO_set_hostname(dbio,data->param_hostname);
        BIO_set_nbio(dbio,data->nbio); */
        break;

    default:
        ret=0;
        break;
        }
    return(ret);
    }

static int acpt_puts(BIO *bp, const char *str)
    {
    int n,ret;

    n=strlen(str);
    ret=acpt_write(bp,str,n);
    return(ret);
    }

BIO *BIO_new_accept(char *str)
    {
    BIO *ret;

    ret=BIO_new(BIO_s_accept());
    if (ret == NULL) return(NULL);
    if (BIO_set_accept_port(ret,str))
        return(ret);
    else
        {
        BIO_free(ret);
        return(NULL);
        }
    }

#endif