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b_sock.c

/* crypto/bio/b_sock.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 <stdlib.h>
#include <errno.h>
#define USE_SOCKETS
#include "cryptlib.h"
#include <openssl/bio.h>
#if defined(OPENSSL_SYS_NETWARE) && defined(NETWARE_BSDSOCK)
#include "netdb.h"
#endif

#ifndef OPENSSL_NO_SOCK

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

#ifdef SO_MAXCONN
#define MAX_LISTEN  SO_MAXCONN
#elif defined(SOMAXCONN)
#define MAX_LISTEN  SOMAXCONN
#else
#define MAX_LISTEN  32
#endif

#if defined(OPENSSL_SYS_WINDOWS) || (defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK))
static int wsa_init_done=0;
#endif

#if 0
static unsigned long BIO_ghbn_hits=0L;
static unsigned long BIO_ghbn_miss=0L;

#define GHBN_NUM  4
static struct ghbn_cache_st
      {
      char name[129];
      struct hostent *ent;
      unsigned long order;
      } ghbn_cache[GHBN_NUM];
#endif

static int get_ip(const char *str,unsigned char *ip);
#if 0
static void ghbn_free(struct hostent *a);
static struct hostent *ghbn_dup(struct hostent *a);
#endif
int BIO_get_host_ip(const char *str, unsigned char *ip)
      {
      int i;
      int err = 1;
      int locked = 0;
      struct hostent *he;

      i=get_ip(str,ip);
      if (i < 0)
            {
            BIOerr(BIO_F_BIO_GET_HOST_IP,BIO_R_INVALID_IP_ADDRESS);
            goto err;
            }

      /* At this point, we have something that is most probably correct
         in some way, so let's init the socket. */
      if (BIO_sock_init() != 1)
            return 0; /* don't generate another error code here */

      /* If the string actually contained an IP address, we need not do
         anything more */
      if (i > 0) return(1);

      /* do a gethostbyname */
      CRYPTO_w_lock(CRYPTO_LOCK_GETHOSTBYNAME);
      locked = 1;
      he=BIO_gethostbyname(str);
      if (he == NULL)
            {
            BIOerr(BIO_F_BIO_GET_HOST_IP,BIO_R_BAD_HOSTNAME_LOOKUP);
            goto err;
            }

      /* cast to short because of win16 winsock definition */
      if ((short)he->h_addrtype != AF_INET)
            {
            BIOerr(BIO_F_BIO_GET_HOST_IP,BIO_R_GETHOSTBYNAME_ADDR_IS_NOT_AF_INET);
            goto err;
            }
      for (i=0; i<4; i++)
            ip[i]=he->h_addr_list[0][i];
      err = 0;

 err:
      if (locked)
            CRYPTO_w_unlock(CRYPTO_LOCK_GETHOSTBYNAME);
      if (err)
            {
            ERR_add_error_data(2,"host=",str);
            return 0;
            }
      else
            return 1;
      }

int BIO_get_port(const char *str, unsigned short *port_ptr)
      {
      int i;
      struct servent *s;

      if (str == NULL)
            {
            BIOerr(BIO_F_BIO_GET_PORT,BIO_R_NO_PORT_DEFINED);
            return(0);
            }
      i=atoi(str);
      if (i != 0)
            *port_ptr=(unsigned short)i;
      else
            {
            CRYPTO_w_lock(CRYPTO_LOCK_GETSERVBYNAME);
            /* Note: under VMS with SOCKETSHR, it seems like the first
             * parameter is 'char *', instead of 'const char *'
             */
            s=getservbyname(
#ifndef CONST_STRICT
                (char *)
#endif
                str,"tcp");
            if(s != NULL)
                  *port_ptr=ntohs((unsigned short)s->s_port);
            CRYPTO_w_unlock(CRYPTO_LOCK_GETSERVBYNAME);
            if(s == NULL)
                  {
                  if (strcmp(str,"http") == 0)
                        *port_ptr=80;
                  else if (strcmp(str,"telnet") == 0)
                        *port_ptr=23;
                  else if (strcmp(str,"socks") == 0)
                        *port_ptr=1080;
                  else if (strcmp(str,"https") == 0)
                        *port_ptr=443;
                  else if (strcmp(str,"ssl") == 0)
                        *port_ptr=443;
                  else if (strcmp(str,"ftp") == 0)
                        *port_ptr=21;
                  else if (strcmp(str,"gopher") == 0)
                        *port_ptr=70;
#if 0
                  else if (strcmp(str,"wais") == 0)
                        *port_ptr=21;
#endif
                  else
                        {
                        SYSerr(SYS_F_GETSERVBYNAME,get_last_socket_error());
                        ERR_add_error_data(3,"service='",str,"'");
                        return(0);
                        }
                  }
            }
      return(1);
      }

int BIO_sock_error(int sock)
      {
      int j,i;
      int size;
             
      size=sizeof(int);
      /* Note: under Windows the third parameter is of type (char *)
       * whereas under other systems it is (void *) if you don't have
       * a cast it will choke the compiler: if you do have a cast then
       * you can either go for (char *) or (void *).
       */
      i=getsockopt(sock,SOL_SOCKET,SO_ERROR,(void *)&j,(void *)&size);
      if (i < 0)
            return(1);
      else
            return(j);
      }

#if 0
long BIO_ghbn_ctrl(int cmd, int iarg, char *parg)
      {
      int i;
      char **p;

      switch (cmd)
            {
      case BIO_GHBN_CTRL_HITS:
            return(BIO_ghbn_hits);
            /* break; */
      case BIO_GHBN_CTRL_MISSES:
            return(BIO_ghbn_miss);
            /* break; */
      case BIO_GHBN_CTRL_CACHE_SIZE:
            return(GHBN_NUM);
            /* break; */
      case BIO_GHBN_CTRL_GET_ENTRY:
            if ((iarg >= 0) && (iarg <GHBN_NUM) &&
                  (ghbn_cache[iarg].order > 0))
                  {
                  p=(char **)parg;
                  if (p == NULL) return(0);
                  *p=ghbn_cache[iarg].name;
                  ghbn_cache[iarg].name[128]='\0';
                  return(1);
                  }
            return(0);
            /* break; */
      case BIO_GHBN_CTRL_FLUSH:
            for (i=0; i<GHBN_NUM; i++)
                  ghbn_cache[i].order=0;
            break;
      default:
            return(0);
            }
      return(1);
      }
#endif

#if 0
static struct hostent *ghbn_dup(struct hostent *a)
      {
      struct hostent *ret;
      int i,j;

      MemCheck_off();
      ret=(struct hostent *)OPENSSL_malloc(sizeof(struct hostent));
      if (ret == NULL) return(NULL);
      memset(ret,0,sizeof(struct hostent));

      for (i=0; a->h_aliases[i] != NULL; i++)
            ;
      i++;
      ret->h_aliases = (char **)OPENSSL_malloc(i*sizeof(char *));
      if (ret->h_aliases == NULL)
            goto err;
      memset(ret->h_aliases, 0, i*sizeof(char *));

      for (i=0; a->h_addr_list[i] != NULL; i++)
            ;
      i++;
      ret->h_addr_list=(char **)OPENSSL_malloc(i*sizeof(char *));
      if (ret->h_addr_list == NULL)
            goto err;
      memset(ret->h_addr_list, 0, i*sizeof(char *));

      j=strlen(a->h_name)+1;
      if ((ret->h_name=OPENSSL_malloc(j)) == NULL) goto err;
      memcpy((char *)ret->h_name,a->h_name,j);
      for (i=0; a->h_aliases[i] != NULL; i++)
            {
            j=strlen(a->h_aliases[i])+1;
            if ((ret->h_aliases[i]=OPENSSL_malloc(j)) == NULL) goto err;
            memcpy(ret->h_aliases[i],a->h_aliases[i],j);
            }
      ret->h_length=a->h_length;
      ret->h_addrtype=a->h_addrtype;
      for (i=0; a->h_addr_list[i] != NULL; i++)
            {
            if ((ret->h_addr_list[i]=OPENSSL_malloc(a->h_length)) == NULL)
                  goto err;
            memcpy(ret->h_addr_list[i],a->h_addr_list[i],a->h_length);
            }
      if (0)
            {
err:  
            if (ret != NULL)
                  ghbn_free(ret);
            ret=NULL;
            }
      MemCheck_on();
      return(ret);
      }

static void ghbn_free(struct hostent *a)
      {
      int i;

      if(a == NULL)
          return;

      if (a->h_aliases != NULL)
            {
            for (i=0; a->h_aliases[i] != NULL; i++)
                  OPENSSL_free(a->h_aliases[i]);
            OPENSSL_free(a->h_aliases);
            }
      if (a->h_addr_list != NULL)
            {
            for (i=0; a->h_addr_list[i] != NULL; i++)
                  OPENSSL_free(a->h_addr_list[i]);
            OPENSSL_free(a->h_addr_list);
            }
      if (a->h_name != NULL) OPENSSL_free(a->h_name);
      OPENSSL_free(a);
      }

#endif

struct hostent *BIO_gethostbyname(const char *name)
      {
#if 1
      /* Caching gethostbyname() results forever is wrong,
       * so we have to let the true gethostbyname() worry about this */
      return gethostbyname(name);
#else
      struct hostent *ret;
      int i,lowi=0,j;
      unsigned long low= (unsigned long)-1;


#  if 0
      /* It doesn't make sense to use locking here: The function interface
       * is not thread-safe, because threads can never be sure when
       * some other thread destroys the data they were given a pointer to.
       */
      CRYPTO_w_lock(CRYPTO_LOCK_GETHOSTBYNAME);
#  endif
      j=strlen(name);
      if (j < 128)
            {
            for (i=0; i<GHBN_NUM; i++)
                  {
                  if (low > ghbn_cache[i].order)
                        {
                        low=ghbn_cache[i].order;
                        lowi=i;
                        }
                  if (ghbn_cache[i].order > 0)
                        {
                        if (strncmp(name,ghbn_cache[i].name,128) == 0)
                              break;
                        }
                  }
            }
      else
            i=GHBN_NUM;

      if (i == GHBN_NUM) /* no hit*/
            {
            BIO_ghbn_miss++;
            /* Note: under VMS with SOCKETSHR, it seems like the first
             * parameter is 'char *', instead of 'const char *'
             */
            ret=gethostbyname(
#  ifndef CONST_STRICT
                (char *)
#  endif
                name);

            if (ret == NULL)
                  goto end;
            if (j > 128) /* too big to cache */
                  {
#  if 0
                  /* If we were trying to make this function thread-safe (which
                   * is bound to fail), we'd have to give up in this case
                   * (or allocate more memory). */
                  ret = NULL;
#  endif
                  goto end;
                  }

            /* else add to cache */
            if (ghbn_cache[lowi].ent != NULL)
                  ghbn_free(ghbn_cache[lowi].ent); /* XXX not thread-safe */
            ghbn_cache[lowi].name[0] = '\0';

            if((ret=ghbn_cache[lowi].ent=ghbn_dup(ret)) == NULL)
                  {
                  BIOerr(BIO_F_BIO_GETHOSTBYNAME,ERR_R_MALLOC_FAILURE);
                  goto end;
                  }
            strncpy(ghbn_cache[lowi].name,name,128);
            ghbn_cache[lowi].order=BIO_ghbn_miss+BIO_ghbn_hits;
            }
      else
            {
            BIO_ghbn_hits++;
            ret= ghbn_cache[i].ent;
            ghbn_cache[i].order=BIO_ghbn_miss+BIO_ghbn_hits;
            }
end:
#  if 0
      CRYPTO_w_unlock(CRYPTO_LOCK_GETHOSTBYNAME);
#  endif
      return(ret);
#endif
      }


int BIO_sock_init(void)
      {
#ifdef OPENSSL_SYS_WINDOWS
      static struct WSAData wsa_state;

      if (!wsa_init_done)
            {
            int err;
        
#ifdef SIGINT
            signal(SIGINT,(void (*)(int))BIO_sock_cleanup);
#endif
            wsa_init_done=1;
            memset(&wsa_state,0,sizeof(wsa_state));
            if (WSAStartup(0x0101,&wsa_state)!=0)
                  {
                  err=WSAGetLastError();
                  SYSerr(SYS_F_WSASTARTUP,err);
                  BIOerr(BIO_F_BIO_SOCK_INIT,BIO_R_WSASTARTUP);
                  return(-1);
                  }
            }
#endif /* OPENSSL_SYS_WINDOWS */
#ifdef WATT32
      extern int _watt_do_exit;
      _watt_do_exit = 0;    /* don't make sock_init() call exit() */
      if (sock_init())
            return (-1);
#endif

#if defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK)
    WORD wVerReq;
    WSADATA wsaData;
    int err;

    if (!wsa_init_done)
    {
   
# ifdef SIGINT
        signal(SIGINT,(void (*)(int))BIO_sock_cleanup);
# endif

        wsa_init_done=1;
        wVerReq = MAKEWORD( 2, 0 );
        err = WSAStartup(wVerReq,&wsaData);
        if (err != 0)
        {
            SYSerr(SYS_F_WSASTARTUP,err);
            BIOerr(BIO_F_BIO_SOCK_INIT,BIO_R_WSASTARTUP);
            return(-1);
                  }
            }
#endif

      return(1);
      }

void BIO_sock_cleanup(void)
      {
#ifdef OPENSSL_SYS_WINDOWS
      if (wsa_init_done)
            {
            wsa_init_done=0;
#ifndef OPENSSL_SYS_WINCE
            WSACancelBlockingCall();
#endif
            WSACleanup();
            }
#elif defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK)
   if (wsa_init_done)
        {
        wsa_init_done=0;
        WSACleanup();
            }
#endif
      }

#if !defined(OPENSSL_SYS_VMS) || __VMS_VER >= 70000000

int BIO_socket_ioctl(int fd, long type, void *arg)
      {
      int i;

#ifdef __DJGPP__
      i=ioctlsocket(fd,type,(char *)arg);
#else
      i=ioctlsocket(fd,type,arg);
#endif /* __DJGPP__ */
      if (i < 0)
            SYSerr(SYS_F_IOCTLSOCKET,get_last_socket_error());
      return(i);
      }
#endif /* __VMS_VER */

/* The reason I have implemented this instead of using sscanf is because
 * Visual C 1.52c gives an unresolved external when linking a DLL :-( */
static int get_ip(const char *str, unsigned char ip[4])
      {
      unsigned int tmp[4];
      int num=0,c,ok=0;

      tmp[0]=tmp[1]=tmp[2]=tmp[3]=0;

      for (;;)
            {
            c= *(str++);
            if ((c >= '0') && (c <= '9'))
                  {
                  ok=1;
                  tmp[num]=tmp[num]*10+c-'0';
                  if (tmp[num] > 255) return(0);
                  }
            else if (c == '.')
                  {
                  if (!ok) return(-1);
                  if (num == 3) return(0);
                  num++;
                  ok=0;
                  }
            else if (c == '\0' && (num == 3) && ok)
                  break;
            else
                  return(0);
            }
      ip[0]=tmp[0];
      ip[1]=tmp[1];
      ip[2]=tmp[2];
      ip[3]=tmp[3];
      return(1);
      }

int BIO_get_accept_socket(char *host, int bind_mode)
      {
      int ret=0;
      struct sockaddr_in server,client;
      int s=INVALID_SOCKET,cs;
      unsigned char ip[4];
      unsigned short port;
      char *str=NULL,*e;
      const char *h,*p;
      unsigned long l;
      int err_num;

      if (BIO_sock_init() != 1) return(INVALID_SOCKET);

      if ((str=BUF_strdup(host)) == NULL) return(INVALID_SOCKET);

      h=p=NULL;
      h=str;
      for (e=str; *e; e++)
            {
            if (*e == ':')
                  {
                  p= &(e[1]);
                  *e='\0';
                  }
            else if (*e == '/')
                  {
                  *e='\0';
                  break;
                  }
            }

      if (p == NULL)
            {
            p=h;
            h="*";
            }

      if (!BIO_get_port(p,&port)) goto err;

      memset((char *)&server,0,sizeof(server));
      server.sin_family=AF_INET;
      server.sin_port=htons(port);

      if (strcmp(h,"*") == 0)
            server.sin_addr.s_addr=INADDR_ANY;
      else
            {
                if (!BIO_get_host_ip(h,&(ip[0]))) goto err;
            l=(unsigned long)
                  ((unsigned long)ip[0]<<24L)|
                  ((unsigned long)ip[1]<<16L)|
                  ((unsigned long)ip[2]<< 8L)|
                  ((unsigned long)ip[3]);
            server.sin_addr.s_addr=htonl(l);
            }

again:
      s=socket(AF_INET,SOCK_STREAM,SOCKET_PROTOCOL);
      if (s == INVALID_SOCKET)
            {
            SYSerr(SYS_F_SOCKET,get_last_socket_error());
            ERR_add_error_data(3,"port='",host,"'");
            BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET,BIO_R_UNABLE_TO_CREATE_SOCKET);
            goto err;
            }

#ifdef SO_REUSEADDR
      if (bind_mode == BIO_BIND_REUSEADDR)
            {
            int i=1;

            ret=setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&i,sizeof(i));
            bind_mode=BIO_BIND_NORMAL;
            }
#endif
      if (bind(s,(struct sockaddr *)&server,sizeof(server)) == -1)
            {
#ifdef SO_REUSEADDR
            err_num=get_last_socket_error();
            if ((bind_mode == BIO_BIND_REUSEADDR_IF_UNUSED) &&
                  (err_num == EADDRINUSE))
                  {
                  memcpy((char *)&client,(char *)&server,sizeof(server));
                  if (strcmp(h,"*") == 0)
                        client.sin_addr.s_addr=htonl(0x7F000001);
                  cs=socket(AF_INET,SOCK_STREAM,SOCKET_PROTOCOL);
                  if (cs != INVALID_SOCKET)
                        {
                        int ii;
                        ii=connect(cs,(struct sockaddr *)&client,
                              sizeof(client));
                        closesocket(cs);
                        if (ii == INVALID_SOCKET)
                              {
                              bind_mode=BIO_BIND_REUSEADDR;
                              closesocket(s);
                              goto again;
                              }
                        /* else error */
                        }
                  /* else error */
                  }
#endif
            SYSerr(SYS_F_BIND,err_num);
            ERR_add_error_data(3,"port='",host,"'");
            BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET,BIO_R_UNABLE_TO_BIND_SOCKET);
            goto err;
            }
      if (listen(s,MAX_LISTEN) == -1)
            {
            SYSerr(SYS_F_BIND,get_last_socket_error());
            ERR_add_error_data(3,"port='",host,"'");
            BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET,BIO_R_UNABLE_TO_LISTEN_SOCKET);
            goto err;
            }
      ret=1;
err:
      if (str != NULL) OPENSSL_free(str);
      if ((ret == 0) && (s != INVALID_SOCKET))
            {
            closesocket(s);
            s= INVALID_SOCKET;
            }
      return(s);
      }

int BIO_accept(int sock, char **addr)
      {
      int ret=INVALID_SOCKET;
      static struct sockaddr_in from;
      unsigned long l;
      unsigned short port;
      int len;
      char *p;

      memset((char *)&from,0,sizeof(from));
      len=sizeof(from);
      /* Note: under VMS with SOCKETSHR the fourth parameter is currently
       * of type (int *) whereas under other systems it is (void *) if
       * you don't have a cast it will choke the compiler: if you do
       * have a cast then you can either go for (int *) or (void *).
       */
      ret=accept(sock,(struct sockaddr *)&from,(void *)&len);
      if (ret == INVALID_SOCKET)
            {
            if(BIO_sock_should_retry(ret)) return -2;
            SYSerr(SYS_F_ACCEPT,get_last_socket_error());
            BIOerr(BIO_F_BIO_ACCEPT,BIO_R_ACCEPT_ERROR);
            goto end;
            }

      if (addr == NULL) goto end;

      l=ntohl(from.sin_addr.s_addr);
      port=ntohs(from.sin_port);
      if (*addr == NULL)
            {
            if ((p=OPENSSL_malloc(24)) == NULL)
                  {
                  BIOerr(BIO_F_BIO_ACCEPT,ERR_R_MALLOC_FAILURE);
                  goto end;
                  }
            *addr=p;
            }
      BIO_snprintf(*addr,24,"%d.%d.%d.%d:%d",
                 (unsigned char)(l>>24L)&0xff,
                 (unsigned char)(l>>16L)&0xff,
                 (unsigned char)(l>> 8L)&0xff,
                 (unsigned char)(l     )&0xff,
                 port);
end:
      return(ret);
      }

int BIO_set_tcp_ndelay(int s, int on)
      {
      int ret=0;
#if defined(TCP_NODELAY) && (defined(IPPROTO_TCP) || defined(SOL_TCP))
      int opt;

#ifdef SOL_TCP
      opt=SOL_TCP;
#else
#ifdef IPPROTO_TCP
      opt=IPPROTO_TCP;
#endif
#endif
      
      ret=setsockopt(s,opt,TCP_NODELAY,(char *)&on,sizeof(on));
#endif
      return(ret == 0);
      }
#endif

int BIO_socket_nbio(int s, int mode)
      {
      int ret= -1;
      int l;

      l=mode;
#ifdef FIONBIO
      ret=BIO_socket_ioctl(s,FIONBIO,&l);
#endif
      return(ret == 0);
      }

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