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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>
#if defined(NETWARE_CLIB)
#include <sys/ioctl.h>
NETDB_DEFINE_CONTEXT
#endif
#endif

#ifndef OPENSSL_NO_SOCK

#include <openssl/dso.h>

#define SOCKET_PROTOCOL IPPROTO_TCP

#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

/*
 * WSAAPI specifier is required to make indirect calls to run-time
 * linked WinSock 2 functions used in this module, to be specific
 * [get|free]addrinfo and getnameinfo. This is because WinSock uses
 * uses non-C calling convention, __stdcall vs. __cdecl, on x86
 * Windows. On non-WinSock platforms WSAAPI needs to be void.
 */
#ifndef WSAAPI
#define WSAAPI
#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 *'
             */
#ifndef CONST_STRICT
            s=getservbyname((char *)str,"tcp");
#else
            s=getservbyname(str,"tcp");
#endif
            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;
             
#if defined(OPENSSL_SYS_BEOS_R5)
      return 0;
#endif
             
      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 */
#if (defined(NETWARE_BSDSOCK) && !defined(__NOVELL_LIBC__))
      return gethostbyname((char*)name);
#else
      return gethostbyname(name);
#endif
#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 *'
             */
#  ifndef CONST_STRICT
            ret=gethostbyname((char *)name);
#  else
            ret=gethostbyname(name);
#  endif

            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;
        
            wsa_init_done=1;
            memset(&wsa_state,0,sizeof(wsa_state));
            /* Not making wsa_state available to the rest of the
             * code is formally wrong. But the structures we use
             * are [beleived to be] invariable among Winsock DLLs,
             * while API availability is [expected to be] probed
             * at run-time with DSO_global_lookup. */
            if (WSAStartup(0x0202,&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)
    {
        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;
#if 0       /* this call is claimed to be non-present in Winsock2 */
            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
# if defined(OPENSSL_SYS_VMS)
      /* 2011-02-18 SMS.
       * VMS ioctl() can't tolerate a 64-bit "void *arg", but we
       * observe that all the consumers pass in an "unsigned long *",
       * so we arrange a local copy with a short pointer, and use
       * that, instead.
       */
#  if __INITIAL_POINTER_SIZE == 64
#   define ARG arg_32p
#   pragma pointer_size save
#   pragma pointer_size 32
      unsigned long arg_32;
      unsigned long *arg_32p;
#   pragma pointer_size restore
      arg_32p = &arg_32;
      arg_32 = *((unsigned long *) arg);
#  else /* __INITIAL_POINTER_SIZE == 64 */
#   define ARG arg
#  endif /* __INITIAL_POINTER_SIZE == 64 [else] */
# else /* defined(OPENSSL_SYS_VMS) */
#  define ARG arg
# endif /* defined(OPENSSL_SYS_VMS) [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;
      union {
            struct sockaddr sa;
            struct sockaddr_in sa_in;
#if OPENSSL_USE_IPV6
            struct sockaddr_in6 sa_in6;
#endif
      } server,client;
      int s=INVALID_SOCKET,cs,addrlen;
      unsigned char ip[4];
      unsigned short port;
      char *str=NULL,*e;
      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;
                  }
            else if (*e == '/')
                  {
                  *e='\0';
                  break;
                  }
            }
      if (p)      *p++='\0';  /* points at last ':', '::port' is special [see below] */
      else  p=h,h=NULL;

#ifdef EAI_FAMILY
      do {
      static union {    void *p;
                  int (WSAAPI *f)(const char *,const char *,
                         const struct addrinfo *,
                         struct addrinfo **);
                  } p_getaddrinfo = {NULL};
      static union {    void *p;
                  void (WSAAPI *f)(struct addrinfo *);
                  } p_freeaddrinfo = {NULL};
      struct addrinfo *res,hint;

      if (p_getaddrinfo.p==NULL)
            {
            if ((p_getaddrinfo.p=DSO_global_lookup("getaddrinfo"))==NULL ||
                (p_freeaddrinfo.p=DSO_global_lookup("freeaddrinfo"))==NULL)
                  p_getaddrinfo.p=(void*)-1;
            }
      if (p_getaddrinfo.p==(void *)-1) break;

      /* '::port' enforces IPv6 wildcard listener. Some OSes,
       * e.g. Solaris, default to IPv6 without any hint. Also
       * note that commonly IPv6 wildchard socket can service
       * IPv4 connections just as well...  */
      memset(&hint,0,sizeof(hint));
      hint.ai_flags = AI_PASSIVE;
      if (h)
            {
            if (strchr(h,':'))
                  {
                  if (h[1]=='\0') h=NULL;
#if OPENSSL_USE_IPV6
                  hint.ai_family = AF_INET6;
#else
                  h=NULL;
#endif
                  }
            else if (h[0]=='*' && h[1]=='\0')
                  {
                  hint.ai_family = AF_INET;
                  h=NULL;
                  }
            }

      if ((*p_getaddrinfo.f)(h,p,&hint,&res)) break;

      addrlen = res->ai_addrlen<=sizeof(server) ?
                  res->ai_addrlen :
                  sizeof(server);
      memcpy(&server, res->ai_addr, addrlen);

      (*p_freeaddrinfo.f)(res);
      goto again;
      } while (0);
#endif

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

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

      if (h == NULL || strcmp(h,"*") == 0)
            server.sa_in.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.sa_in.sin_addr.s_addr=htonl(l);
            }

again:
      s=socket(server.sa.sa_family,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,&server.sa,addrlen) == -1)
            {
#ifdef SO_REUSEADDR
            err_num=get_last_socket_error();
            if ((bind_mode == BIO_BIND_REUSEADDR_IF_UNUSED) &&
#ifdef OPENSSL_SYS_WINDOWS
                  /* Some versions of Windows define EADDRINUSE to
                   * a dummy value.
                   */
                  (err_num == WSAEADDRINUSE))
#else
                  (err_num == EADDRINUSE))
#endif
                  {
                  client = server;
                  if (h == NULL || strcmp(h,"*") == 0)
                        {
#if OPENSSL_USE_IPV6
                        if (client.sa.sa_family == AF_INET6)
                              {
                              memset(&client.sa_in6.sin6_addr,0,sizeof(client.sa_in6.sin6_addr));
                              client.sa_in6.sin6_addr.s6_addr[15]=1;
                              }
                        else
#endif
                        if (client.sa.sa_family == AF_INET)
                              {
                              client.sa_in.sin_addr.s_addr=htonl(0x7F000001);
                              }
                        else  goto err;
                        }
                  cs=socket(client.sa.sa_family,SOCK_STREAM,SOCKET_PROTOCOL);
                  if (cs != INVALID_SOCKET)
                        {
                        int ii;
                        ii=connect(cs,&client.sa,addrlen);
                        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;
      unsigned long l;
      unsigned short port;
      char *p;

      struct {
      /*
       * As for following union. Trouble is that there are platforms
       * that have socklen_t and there are platforms that don't, on
       * some platforms socklen_t is int and on some size_t. So what
       * one can do? One can cook #ifdef spaghetti, which is nothing
       * but masochistic. Or one can do union between int and size_t.
       * One naturally does it primarily for 64-bit platforms where
       * sizeof(int) != sizeof(size_t). But would it work? Note that
       * if size_t member is initialized to 0, then later int member
       * assignment naturally does the job on little-endian platforms
       * regardless accept's expectations! What about big-endians?
       * If accept expects int*, then it works, and if size_t*, then
       * length value would appear as unreasonably large. But this
       * won't prevent it from filling in the address structure. The
       * trouble of course would be if accept returns more data than
       * actual buffer can accomodate and overwrite stack... That's
       * where early OPENSSL_assert comes into picture. Besides, the
       * only 64-bit big-endian platform found so far that expects
       * size_t* is HP-UX, where stack grows towards higher address.
       * <appro>
       */
      union { size_t s; int i; } len;
      union {
            struct sockaddr sa;
            struct sockaddr_in sa_in;
#if OPENSSL_USE_IPV6
            struct sockaddr_in6 sa_in6;
#endif
            } from;
      } sa;

      sa.len.s=0;
      sa.len.i=sizeof(sa.from);
      memset(&sa.from,0,sizeof(sa.from));
      ret=accept(sock,&sa.from.sa,(void *)&sa.len);
      if (sizeof(sa.len.i)!=sizeof(sa.len.s) && sa.len.i==0)
            {
            OPENSSL_assert(sa.len.s<=sizeof(sa.from));
            sa.len.i = (int)sa.len.s;
            /* use sa.len.i from this point */
            }
      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;

#ifdef EAI_FAMILY
      do {
      char   h[NI_MAXHOST],s[NI_MAXSERV];
      size_t nl;
      static union {    void *p;
                  int (WSAAPI *f)(const struct sockaddr *,size_t/*socklen_t*/,
                         char *,size_t,char *,size_t,int);
                  } p_getnameinfo = {NULL};
                  /* 2nd argument to getnameinfo is specified to
                   * be socklen_t. Unfortunately there is a number
                   * of environments where socklen_t is not defined.
                   * As it's passed by value, it's safe to pass it
                   * as size_t... <appro> */

      if (p_getnameinfo.p==NULL)
            {
            if ((p_getnameinfo.p=DSO_global_lookup("getnameinfo"))==NULL)
                  p_getnameinfo.p=(void*)-1;
            }
      if (p_getnameinfo.p==(void *)-1) break;

      if ((*p_getnameinfo.f)(&sa.from.sa,sa.len.i,h,sizeof(h),s,sizeof(s),
          NI_NUMERICHOST|NI_NUMERICSERV)) break;
      nl = strlen(h)+strlen(s)+2;
      p = *addr;
      if (p)      { *p = '\0'; p = OPENSSL_realloc(p,nl);   }
      else  { p = OPENSSL_malloc(nl);           }
      if (p==NULL)
            {
            BIOerr(BIO_F_BIO_ACCEPT,ERR_R_MALLOC_FAILURE);
            goto end;
            }
      *addr = p;
      BIO_snprintf(*addr,nl,"%s:%s",h,s);
      goto end;
      } while(0);
#endif
      if (sa.from.sa.sa_family != AF_INET) goto end;
      l=ntohl(sa.from.sa_in.sin_addr.s_addr);
      port=ntohs(sa.from.sa_in.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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