crypto/openssl-0.9/crypto/bio/b_sock.c

   1 /* crypto/bio/b_sock.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include <stdlib.h>
  61 #include <errno.h>
  62 #define USE_SOCKETS
  63 #include "cryptlib.h"
  64 #include <openssl/bio.h>
  65 #if defined(OPENSSL_SYS_NETWARE) && defined(NETWARE_BSDSOCK)
  66 #include "netdb.h"
  67 #endif
  68
  69 #ifndef OPENSSL_NO_SOCK
  70
  71 #ifdef OPENSSL_SYS_WIN16
  72 #define SOCKET_PROTOCOL 0 /* more microsoft stupidity */
  73 #else
  74 #define SOCKET_PROTOCOL IPPROTO_TCP
  75 #endif
  76
  77 #ifdef SO_MAXCONN
  78 #define MAX_LISTEN  SO_MAXCONN
  79 #elif defined(SOMAXCONN)
  80 #define MAX_LISTEN  SOMAXCONN
  81 #else
  82 #define MAX_LISTEN  32
  83 #endif
  84
  85 #if defined(OPENSSL_SYS_WINDOWS) || (defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK))
  86 static int wsa_init_done=0;
  87 #endif
  88
  89 #if 0
  90 static unsigned long BIO_ghbn_hits=0L;
  91 static unsigned long BIO_ghbn_miss=0L;
  92
  93 #define GHBN_NUM        4
  94 static struct ghbn_cache_st
  95         {
  96         char name[129];
  97         struct hostent *ent;
  98         unsigned long order;
  99         } ghbn_cache[GHBN_NUM];
 100 #endif
 101
 102 static int get_ip(const char *str,unsigned char *ip);
 103 #if 0
 104 static void ghbn_free(struct hostent *a);
 105 static struct hostent *ghbn_dup(struct hostent *a);
 106 #endif
 107 int BIO_get_host_ip(const char *str, unsigned char *ip)
 108         {
 109         int i;
 110         int err = 1;
 111         int locked = 0;
 112         struct hostent *he;
 113
 114         i=get_ip(str,ip);
 115         if (i < 0)
 116                 {
 117                 BIOerr(BIO_F_BIO_GET_HOST_IP,BIO_R_INVALID_IP_ADDRESS);
 118                 goto err;
 119                 }
 120
 121         /* At this point, we have something that is most probably correct
 122            in some way, so let's init the socket. */
 123         if (BIO_sock_init() != 1)
 124                 return 0; /* don't generate another error code here */
 125
 126         /* If the string actually contained an IP address, we need not do
 127            anything more */
 128         if (i > 0) return(1);
 129
 130         /* do a gethostbyname */
 131         CRYPTO_w_lock(CRYPTO_LOCK_GETHOSTBYNAME);
 132         locked = 1;
 133         he=BIO_gethostbyname(str);
 134         if (he == NULL)
 135                 {
 136                 BIOerr(BIO_F_BIO_GET_HOST_IP,BIO_R_BAD_HOSTNAME_LOOKUP);
 137                 goto err;
 138                 }
 139
 140         /* cast to short because of win16 winsock definition */
 141         if ((short)he->h_addrtype != AF_INET)
 142                 {
 143                 BIOerr(BIO_F_BIO_GET_HOST_IP,BIO_R_GETHOSTBYNAME_ADDR_IS_NOT_AF_INET);
 144                 goto err;
 145                 }
 146         for (i=0; i<4; i++)
 147                 ip[i]=he->h_addr_list[0][i];
 148         err = 0;
 149
 150  err:
 151         if (locked)
 152                 CRYPTO_w_unlock(CRYPTO_LOCK_GETHOSTBYNAME);
 153         if (err)
 154                 {
 155                 ERR_add_error_data(2,"host=",str);
 156                 return 0;
 157                 }
 158         else
 159                 return 1;
 160         }
 161
 162 int BIO_get_port(const char *str, unsigned short *port_ptr)
 163         {
 164         int i;
 165         struct servent *s;
 166
 167         if (str == NULL)
 168                 {
 169                 BIOerr(BIO_F_BIO_GET_PORT,BIO_R_NO_PORT_DEFINED);
 170                 return(0);
 171                 }
 172         i=atoi(str);
 173         if (i != 0)
 174                 *port_ptr=(unsigned short)i;
 175         else
 176                 {
 177                 CRYPTO_w_lock(CRYPTO_LOCK_GETSERVBYNAME);
 178                 /* Note: under VMS with SOCKETSHR, it seems like the first
 179                  * parameter is 'char *', instead of 'const char *'
 180                  */
 181                 s=getservbyname(
 182 #ifndef CONST_STRICT
 183                     (char *)
 184 #endif
 185                     str,"tcp");
 186                 if(s != NULL)
 187                         *port_ptr=ntohs((unsigned short)s->s_port);
 188                 CRYPTO_w_unlock(CRYPTO_LOCK_GETSERVBYNAME);
 189                 if(s == NULL)
 190                         {
 191                         if (strcmp(str,"http") == 0)
 192                                 *port_ptr=80;
 193                         else if (strcmp(str,"telnet") == 0)
 194                                 *port_ptr=23;
 195                         else if (strcmp(str,"socks") == 0)
 196                                 *port_ptr=1080;
 197                         else if (strcmp(str,"https") == 0)
 198                                 *port_ptr=443;
 199                         else if (strcmp(str,"ssl") == 0)
 200                                 *port_ptr=443;
 201                         else if (strcmp(str,"ftp") == 0)
 202                                 *port_ptr=21;
 203                         else if (strcmp(str,"gopher") == 0)
 204                                 *port_ptr=70;
 205 #if 0
 206                         else if (strcmp(str,"wais") == 0)
 207                                 *port_ptr=21;
 208 #endif
 209                         else
 210                                 {
 211                                 SYSerr(SYS_F_GETSERVBYNAME,get_last_socket_error());
 212                                 ERR_add_error_data(3,"service='",str,"'");
 213                                 return(0);
 214                                 }
 215                         }
 216                 }
 217         return(1);
 218         }
 219
 220 int BIO_sock_error(int sock)
 221         {
 222         int j,i;
 223         int size;
 224
 225         size=sizeof(int);
 226         /* Note: under Windows the third parameter is of type (char *)
 227          * whereas under other systems it is (void *) if you don't have
 228          * a cast it will choke the compiler: if you do have a cast then
 229          * you can either go for (char *) or (void *).
 230          */
 231         i=getsockopt(sock,SOL_SOCKET,SO_ERROR,(void *)&j,(void *)&size);
 232         if (i < 0)
 233                 return(1);
 234         else
 235                 return(j);
 236         }
 237
 238 #if 0
 239 long BIO_ghbn_ctrl(int cmd, int iarg, char *parg)
 240         {
 241         int i;
 242         char **p;
 243
 244         switch (cmd)
 245                 {
 246         case BIO_GHBN_CTRL_HITS:
 247                 return(BIO_ghbn_hits);
 248                 /* break; */
 249         case BIO_GHBN_CTRL_MISSES:
 250                 return(BIO_ghbn_miss);
 251                 /* break; */
 252         case BIO_GHBN_CTRL_CACHE_SIZE:
 253                 return(GHBN_NUM);
 254                 /* break; */
 255         case BIO_GHBN_CTRL_GET_ENTRY:
 256                 if ((iarg >= 0) && (iarg <GHBN_NUM) &&
 257                         (ghbn_cache[iarg].order > 0))
 258                         {
 259                         p=(char **)parg;
 260                         if (p == NULL) return(0);
 261                         *p=ghbn_cache[iarg].name;
 262                         ghbn_cache[iarg].name[128]='\0';
 263                         return(1);
 264                         }
 265                 return(0);
 266                 /* break; */
 267         case BIO_GHBN_CTRL_FLUSH:
 268                 for (i=0; i<GHBN_NUM; i++)
 269                         ghbn_cache[i].order=0;
 270                 break;
 271         default:
 272                 return(0);
 273                 }
 274         return(1);
 275         }
 276 #endif
 277
 278 #if 0
 279 static struct hostent *ghbn_dup(struct hostent *a)
 280         {
 281         struct hostent *ret;
 282         int i,j;
 283
 284         MemCheck_off();
 285         ret=(struct hostent *)OPENSSL_malloc(sizeof(struct hostent));
 286         if (ret == NULL) return(NULL);
 287         memset(ret,0,sizeof(struct hostent));
 288
 289         for (i=0; a->h_aliases[i] != NULL; i++)
 290                 ;
 291         i++;
 292         ret->h_aliases = (char **)OPENSSL_malloc(i*sizeof(char *));
 293         if (ret->h_aliases == NULL)
 294                 goto err;
 295         memset(ret->h_aliases, 0, i*sizeof(char *));
 296
 297         for (i=0; a->h_addr_list[i] != NULL; i++)
 298                 ;
 299         i++;
 300         ret->h_addr_list=(char **)OPENSSL_malloc(i*sizeof(char *));
 301         if (ret->h_addr_list == NULL)
 302                 goto err;
 303         memset(ret->h_addr_list, 0, i*sizeof(char *));
 304
 305         j=strlen(a->h_name)+1;
 306         if ((ret->h_name=OPENSSL_malloc(j)) == NULL) goto err;
 307         memcpy((char *)ret->h_name,a->h_name,j);
 308         for (i=0; a->h_aliases[i] != NULL; i++)
 309                 {
 310                 j=strlen(a->h_aliases[i])+1;
 311                 if ((ret->h_aliases[i]=OPENSSL_malloc(j)) == NULL) goto err;
 312                 memcpy(ret->h_aliases[i],a->h_aliases[i],j);
 313                 }
 314         ret->h_length=a->h_length;
 315         ret->h_addrtype=a->h_addrtype;
 316         for (i=0; a->h_addr_list[i] != NULL; i++)
 317                 {
 318                 if ((ret->h_addr_list[i]=OPENSSL_malloc(a->h_length)) == NULL)
 319                         goto err;
 320                 memcpy(ret->h_addr_list[i],a->h_addr_list[i],a->h_length);
 321                 }
 322         if (0)
 323                 {
 324 err:
 325                 if (ret != NULL)
 326                         ghbn_free(ret);
 327                 ret=NULL;
 328                 }
 329         MemCheck_on();
 330         return(ret);
 331         }
 332
 333 static void ghbn_free(struct hostent *a)
 334         {
 335         int i;
 336
 337         if(a == NULL)
 338             return;
 339
 340         if (a->h_aliases != NULL)
 341                 {
 342                 for (i=0; a->h_aliases[i] != NULL; i++)
 343                         OPENSSL_free(a->h_aliases[i]);
 344                 OPENSSL_free(a->h_aliases);
 345                 }
 346         if (a->h_addr_list != NULL)
 347                 {
 348                 for (i=0; a->h_addr_list[i] != NULL; i++)
 349                         OPENSSL_free(a->h_addr_list[i]);
 350                 OPENSSL_free(a->h_addr_list);
 351                 }
 352         if (a->h_name != NULL) OPENSSL_free(a->h_name);
 353         OPENSSL_free(a);
 354         }
 355
 356 #endif
 357
 358 struct hostent *BIO_gethostbyname(const char *name)
 359         {
 360 #if 1
 361         /* Caching gethostbyname() results forever is wrong,
 362          * so we have to let the true gethostbyname() worry about this */
 363         return gethostbyname(name);
 364 #else
 365         struct hostent *ret;
 366         int i,lowi=0,j;
 367         unsigned long low= (unsigned long)-1;
 368
 369
 370 #  if 0
 371         /* It doesn't make sense to use locking here: The function interface
 372          * is not thread-safe, because threads can never be sure when
 373          * some other thread destroys the data they were given a pointer to.
 374          */
 375         CRYPTO_w_lock(CRYPTO_LOCK_GETHOSTBYNAME);
 376 #  endif
 377         j=strlen(name);
 378         if (j < 128)
 379                 {
 380                 for (i=0; i<GHBN_NUM; i++)
 381                         {
 382                         if (low > ghbn_cache[i].order)
 383                                 {
 384                                 low=ghbn_cache[i].order;
 385                                 lowi=i;
 386                                 }
 387                         if (ghbn_cache[i].order > 0)
 388                                 {
 389                                 if (strncmp(name,ghbn_cache[i].name,128) == 0)
 390                                         break;
 391                                 }
 392                         }
 393                 }
 394         else
 395                 i=GHBN_NUM;
 396
 397         if (i == GHBN_NUM) /* no hit*/
 398                 {
 399                 BIO_ghbn_miss++;
 400                 /* Note: under VMS with SOCKETSHR, it seems like the first
 401                  * parameter is 'char *', instead of 'const char *'
 402                  */
 403                 ret=gethostbyname(
 404 #  ifndef CONST_STRICT
 405                     (char *)
 406 #  endif
 407                     name);
 408
 409                 if (ret == NULL)
 410                         goto end;
 411                 if (j > 128) /* too big to cache */
 412                         {
 413 #  if 0
 414                         /* If we were trying to make this function thread-safe (which
 415                          * is bound to fail), we'd have to give up in this case
 416                          * (or allocate more memory). */
 417                         ret = NULL;
 418 #  endif
 419                         goto end;
 420                         }
 421
 422                 /* else add to cache */
 423                 if (ghbn_cache[lowi].ent != NULL)
 424                         ghbn_free(ghbn_cache[lowi].ent); /* XXX not thread-safe */
 425                 ghbn_cache[lowi].name[0] = '\0';
 426
 427                 if((ret=ghbn_cache[lowi].ent=ghbn_dup(ret)) == NULL)
 428                         {
 429                         BIOerr(BIO_F_BIO_GETHOSTBYNAME,ERR_R_MALLOC_FAILURE);
 430                         goto end;
 431                         }
 432                 strncpy(ghbn_cache[lowi].name,name,128);
 433                 ghbn_cache[lowi].order=BIO_ghbn_miss+BIO_ghbn_hits;
 434                 }
 435         else
 436                 {
 437                 BIO_ghbn_hits++;
 438                 ret= ghbn_cache[i].ent;
 439                 ghbn_cache[i].order=BIO_ghbn_miss+BIO_ghbn_hits;
 440                 }
 441 end:
 442 #  if 0
 443         CRYPTO_w_unlock(CRYPTO_LOCK_GETHOSTBYNAME);
 444 #  endif
 445         return(ret);
 446 #endif
 447         }
 448
 449
 450 int BIO_sock_init(void)
 451         {
 452 #ifdef OPENSSL_SYS_WINDOWS
 453         static struct WSAData wsa_state;
 454
 455         if (!wsa_init_done)
 456                 {
 457                 int err;
 458
 459                 wsa_init_done=1;
 460                 memset(&wsa_state,0,sizeof(wsa_state));
 461                 if (WSAStartup(0x0101,&wsa_state)!=0)
 462                         {
 463                         err=WSAGetLastError();
 464                         SYSerr(SYS_F_WSASTARTUP,err);
 465                         BIOerr(BIO_F_BIO_SOCK_INIT,BIO_R_WSASTARTUP);
 466                         return(-1);
 467                         }
 468                 }
 469 #endif /* OPENSSL_SYS_WINDOWS */
 470 #ifdef WATT32
 471         extern int _watt_do_exit;
 472         _watt_do_exit = 0;    /* don't make sock_init() call exit() */
 473         if (sock_init())
 474                 return (-1);
 475 #endif
 476
 477 #if defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK)
 478     WORD wVerReq;
 479     WSADATA wsaData;
 480     int err;
 481
 482     if (!wsa_init_done)
 483     {
 484         wsa_init_done=1;
 485         wVerReq = MAKEWORD( 2, 0 );
 486         err = WSAStartup(wVerReq,&wsaData);
 487         if (err != 0)
 488         {
 489             SYSerr(SYS_F_WSASTARTUP,err);
 490             BIOerr(BIO_F_BIO_SOCK_INIT,BIO_R_WSASTARTUP);
 491             return(-1);
 492                         }
 493                 }
 494 #endif
 495
 496         return(1);
 497         }
 498
 499 void BIO_sock_cleanup(void)
 500         {
 501 #ifdef OPENSSL_SYS_WINDOWS
 502         if (wsa_init_done)
 503                 {
 504                 wsa_init_done=0;
 505 #ifndef OPENSSL_SYS_WINCE
 506                 WSACancelBlockingCall();        /* Winsock 1.1 specific */
 507 #endif
 508                 WSACleanup();
 509                 }
 510 #elif defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK)
 511    if (wsa_init_done)
 512         {
 513         wsa_init_done=0;
 514         WSACleanup();
 515                 }
 516 #endif
 517         }
 518
 519 #if !defined(OPENSSL_SYS_VMS) || __VMS_VER >= 70000000
 520
 521 int BIO_socket_ioctl(int fd, long type, void *arg)
 522         {
 523         int i;
 524
 525 #ifdef __DJGPP__
 526         i=ioctlsocket(fd,type,(char *)arg);
 527 #else
 528         i=ioctlsocket(fd,type,arg);
 529 #endif /* __DJGPP__ */
 530         if (i < 0)
 531                 SYSerr(SYS_F_IOCTLSOCKET,get_last_socket_error());
 532         return(i);
 533         }
 534 #endif /* __VMS_VER */
 535
 536 /* The reason I have implemented this instead of using sscanf is because
 537  * Visual C 1.52c gives an unresolved external when linking a DLL :-( */
 538 static int get_ip(const char *str, unsigned char ip[4])
 539         {
 540         unsigned int tmp[4];
 541         int num=0,c,ok=0;
 542
 543         tmp[0]=tmp[1]=tmp[2]=tmp[3]=0;
 544
 545         for (;;)
 546                 {
 547                 c= *(str++);
 548                 if ((c >= '0') && (c <= '9'))
 549                         {
 550                         ok=1;
 551                         tmp[num]=tmp[num]*10+c-'0';
 552                         if (tmp[num] > 255) return(0);
 553                         }
 554                 else if (c == '.')
 555                         {
 556                         if (!ok) return(-1);
 557                         if (num == 3) return(0);
 558                         num++;
 559                         ok=0;
 560                         }
 561                 else if (c == '\0' && (num == 3) && ok)
 562                         break;
 563                 else
 564                         return(0);
 565                 }
 566         ip[0]=tmp[0];
 567         ip[1]=tmp[1];
 568         ip[2]=tmp[2];
 569         ip[3]=tmp[3];
 570         return(1);
 571         }
 572
 573 int BIO_get_accept_socket(char *host, int bind_mode)
 574         {
 575         int ret=0;
 576         struct sockaddr_in server,client;
 577         int s=INVALID_SOCKET,cs;
 578         unsigned char ip[4];
 579         unsigned short port;
 580         char *str=NULL,*e;
 581         const char *h,*p;
 582         unsigned long l;
 583         int err_num;
 584
 585         if (BIO_sock_init() != 1) return(INVALID_SOCKET);
 586
 587         if ((str=BUF_strdup(host)) == NULL) return(INVALID_SOCKET);
 588
 589         h=p=NULL;
 590         h=str;
 591         for (e=str; *e; e++)
 592                 {
 593                 if (*e == ':')
 594                         {
 595                         p= &(e[1]);
 596                         *e='\0';
 597                         }
 598                 else if (*e == '/')
 599                         {
 600                         *e='\0';
 601                         break;
 602                         }
 603                 }
 604
 605         if (p == NULL)
 606                 {
 607                 p=h;
 608                 h="*";
 609                 }
 610
 611         if (!BIO_get_port(p,&port)) goto err;
 612
 613         memset((char *)&server,0,sizeof(server));
 614         server.sin_family=AF_INET;
 615         server.sin_port=htons(port);
 616
 617         if (strcmp(h,"*") == 0)
 618                 server.sin_addr.s_addr=INADDR_ANY;
 619         else
 620                 {
 621                 if (!BIO_get_host_ip(h,&(ip[0]))) goto err;
 622                 l=(unsigned long)
 623                         ((unsigned long)ip[0]<<24L)|
 624                         ((unsigned long)ip[1]<<16L)|
 625                         ((unsigned long)ip[2]<< 8L)|
 626                         ((unsigned long)ip[3]);
 627                 server.sin_addr.s_addr=htonl(l);
 628                 }
 629
 630 again:
 631         s=socket(AF_INET,SOCK_STREAM,SOCKET_PROTOCOL);
 632         if (s == INVALID_SOCKET)
 633                 {
 634                 SYSerr(SYS_F_SOCKET,get_last_socket_error());
 635                 ERR_add_error_data(3,"port='",host,"'");
 636                 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET,BIO_R_UNABLE_TO_CREATE_SOCKET);
 637                 goto err;
 638                 }
 639
 640 #ifdef SO_REUSEADDR
 641         if (bind_mode == BIO_BIND_REUSEADDR)
 642                 {
 643                 int i=1;
 644
 645                 ret=setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&i,sizeof(i));
 646                 bind_mode=BIO_BIND_NORMAL;
 647                 }
 648 #endif
 649         if (bind(s,(struct sockaddr *)&server,sizeof(server)) == -1)
 650                 {
 651 #ifdef SO_REUSEADDR
 652                 err_num=get_last_socket_error();
 653                 if ((bind_mode == BIO_BIND_REUSEADDR_IF_UNUSED) &&
 654                         (err_num == EADDRINUSE))
 655                         {
 656                         memcpy((char *)&client,(char *)&server,sizeof(server));
 657                         if (strcmp(h,"*") == 0)
 658                                 client.sin_addr.s_addr=htonl(0x7F000001);
 659                         cs=socket(AF_INET,SOCK_STREAM,SOCKET_PROTOCOL);
 660                         if (cs != INVALID_SOCKET)
 661                                 {
 662                                 int ii;
 663                                 ii=connect(cs,(struct sockaddr *)&client,
 664                                         sizeof(client));
 665                                 closesocket(cs);
 666                                 if (ii == INVALID_SOCKET)
 667                                         {
 668                                         bind_mode=BIO_BIND_REUSEADDR;
 669                                         closesocket(s);
 670                                         goto again;
 671                                         }
 672                                 /* else error */
 673                                 }
 674                         /* else error */
 675                         }
 676 #endif
 677                 SYSerr(SYS_F_BIND,err_num);
 678                 ERR_add_error_data(3,"port='",host,"'");
 679                 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET,BIO_R_UNABLE_TO_BIND_SOCKET);
 680                 goto err;
 681                 }
 682         if (listen(s,MAX_LISTEN) == -1)
 683                 {
 684                 SYSerr(SYS_F_BIND,get_last_socket_error());
 685                 ERR_add_error_data(3,"port='",host,"'");
 686                 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET,BIO_R_UNABLE_TO_LISTEN_SOCKET);
 687                 goto err;
 688                 }
 689         ret=1;
 690 err:
 691         if (str != NULL) OPENSSL_free(str);
 692         if ((ret == 0) && (s != INVALID_SOCKET))
 693                 {
 694                 closesocket(s);
 695                 s= INVALID_SOCKET;
 696                 }
 697         return(s);
 698         }
 699
 700 int BIO_accept(int sock, char **addr)
 701         {
 702         int ret=INVALID_SOCKET;
 703         static struct sockaddr_in from;
 704         unsigned long l;
 705         unsigned short port;
 706         int len;
 707         char *p;
 708
 709         memset((char *)&from,0,sizeof(from));
 710         len=sizeof(from);
 711         /* Note: under VMS with SOCKETSHR the fourth parameter is currently
 712          * of type (int *) whereas under other systems it is (void *) if
 713          * you don't have a cast it will choke the compiler: if you do
 714          * have a cast then you can either go for (int *) or (void *).
 715          */
 716         ret=accept(sock,(struct sockaddr *)&from,(void *)&len);
 717         if (ret == INVALID_SOCKET)
 718                 {
 719                 if(BIO_sock_should_retry(ret)) return -2;
 720                 SYSerr(SYS_F_ACCEPT,get_last_socket_error());
 721                 BIOerr(BIO_F_BIO_ACCEPT,BIO_R_ACCEPT_ERROR);
 722                 goto end;
 723                 }
 724
 725         if (addr == NULL) goto end;
 726
 727         l=ntohl(from.sin_addr.s_addr);
 728         port=ntohs(from.sin_port);
 729         if (*addr == NULL)
 730                 {
 731                 if ((p=OPENSSL_malloc(24)) == NULL)
 732                         {
 733                         BIOerr(BIO_F_BIO_ACCEPT,ERR_R_MALLOC_FAILURE);
 734                         goto end;
 735                         }
 736                 *addr=p;
 737                 }
 738         BIO_snprintf(*addr,24,"%d.%d.%d.%d:%d",
 739                      (unsigned char)(l>>24L)&0xff,
 740                      (unsigned char)(l>>16L)&0xff,
 741                      (unsigned char)(l>> 8L)&0xff,
 742                      (unsigned char)(l     )&0xff,
 743                      port);
 744 end:
 745         return(ret);
 746         }
 747
 748 int BIO_set_tcp_ndelay(int s, int on)
 749         {
 750         int ret=0;
 751 #if defined(TCP_NODELAY) && (defined(IPPROTO_TCP) || defined(SOL_TCP))
 752         int opt;
 753
 754 #ifdef SOL_TCP
 755         opt=SOL_TCP;
 756 #else
 757 #ifdef IPPROTO_TCP
 758         opt=IPPROTO_TCP;
 759 #endif
 760 #endif
 761
 762         ret=setsockopt(s,opt,TCP_NODELAY,(char *)&on,sizeof(on));
 763 #endif
 764         return(ret == 0);
 765         }
 766 #endif
 767
 768 int BIO_socket_nbio(int s, int mode)
 769         {
 770         int ret= -1;
 771         int l;
 772
 773         l=mode;
 774 #ifdef FIONBIO
 775         ret=BIO_socket_ioctl(s,FIONBIO,&l);
 776 #endif
 777         return(ret == 0);
 778         }