b_sock.c

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/* crypto/bio/b_sock.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 <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);
    }

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);
    }
#endif