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bss_acpt.c

/* crypto/bio/bss_acpt.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * 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 (tjh@cryptsoft.com).
 * 
 * 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 (eay@cryptsoft.com)"
 *    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 (tjh@cryptsoft.com)"
 * 
 * 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

00078 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

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