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 #ifndef OPENSSL_NO_SOCK
  60
  61 #include <stdio.h>
  62 #include <stdlib.h>
  63 #include <errno.h>
  64 #define USE_SOCKETS
  65 #include "cryptlib.h"
  66 #include <openssl/bio.h>
  67
  68 #ifdef OPENSSL_SYS_WIN16
  69 #define SOCKET_PROTOCOL 0 /* more microsoft stupidity */
  70 #else
  71 #define SOCKET_PROTOCOL IPPROTO_TCP
  72 #endif
  73
  74 #ifdef SO_MAXCONN
  75 #define MAX_LISTEN  SO_MAXCONN
  76 #elif defined(SOMAXCONN)
  77 #define MAX_LISTEN  SOMAXCONN
  78 #else
  79 #define MAX_LISTEN  32
  80 #endif
  81
  82 #ifdef OPENSSL_SYS_WINDOWS
  83 static int wsa_init_done=0;
  84 #endif
  85
  86 static unsigned long BIO_ghbn_hits=0L;
  87 static unsigned long BIO_ghbn_miss=0L;
  88
  89 #define GHBN_NUM        4
  90 static struct ghbn_cache_st
  91         {
  92         char name[129];
  93         struct hostent *ent;
  94         unsigned long order;
  95         } ghbn_cache[GHBN_NUM];
  96
  97 static int get_ip(const char *str,unsigned char *ip);
  98 #if 0
  99 static void ghbn_free(struct hostent *a);
 100 static struct hostent *ghbn_dup(struct hostent *a);
 101 #endif
 102 int BIO_get_host_ip(const char *str, unsigned char *ip)
 103         {
 104         int i;
 105         int err = 1;
 106         int locked = 0;
 107         struct hostent *he;
 108
 109         i=get_ip(str,ip);
 110         if (i < 0)
 111                 {
 112                 BIOerr(BIO_F_BIO_GET_HOST_IP,BIO_R_INVALID_IP_ADDRESS);
 113                 goto err;
 114                 }
 115
 116         /* At this point, we have something that is most probably correct
 117            in some way, so let's init the socket. */
 118         if (BIO_sock_init() != 1)
 119                 return 0; /* don't generate another error code here */
 120
 121         /* If the string actually contained an IP address, we need not do
 122            anything more */
 123         if (i > 0) return(1);
 124
 125         /* do a gethostbyname */
 126         CRYPTO_w_lock(CRYPTO_LOCK_GETHOSTBYNAME);
 127         locked = 1;
 128         he=BIO_gethostbyname(str);
 129         if (he == NULL)
 130                 {
 131                 BIOerr(BIO_F_BIO_GET_HOST_IP,BIO_R_BAD_HOSTNAME_LOOKUP);
 132                 goto err;
 133                 }
 134
 135         /* cast to short because of win16 winsock definition */
 136         if ((short)he->h_addrtype != AF_INET)
 137                 {
 138                 BIOerr(BIO_F_BIO_GET_HOST_IP,BIO_R_GETHOSTBYNAME_ADDR_IS_NOT_AF_INET);
 139                 goto err;
 140                 }
 141         for (i=0; i<4; i++)
 142                 ip[i]=he->h_addr_list[0][i];
 143         err = 0;
 144
 145  err:
 146         if (locked)
 147                 CRYPTO_w_unlock(CRYPTO_LOCK_GETHOSTBYNAME);
 148         if (err)
 149                 {
 150                 ERR_add_error_data(2,"host=",str);
 151                 return 0;
 152                 }
 153         else
 154                 return 1;
 155         }
 156
 157 int BIO_get_port(const char *str, unsigned short *port_ptr)
 158         {
 159         int i;
 160         struct servent *s;
 161
 162         if (str == NULL)
 163                 {
 164                 BIOerr(BIO_F_BIO_GET_PORT,BIO_R_NO_PORT_DEFINED);
 165                 return(0);
 166                 }
 167         i=atoi(str);
 168         if (i != 0)
 169                 *port_ptr=(unsigned short)i;
 170         else
 171                 {
 172                 CRYPTO_w_lock(CRYPTO_LOCK_GETSERVBYNAME);
 173                 /* Note: under VMS with SOCKETSHR, it seems like the first
 174                  * parameter is 'char *', instead of 'const char *'
 175                  */
 176                 s=getservbyname(
 177 #ifndef CONST_STRICT
 178                     (char *)
 179 #endif
 180                     str,"tcp");
 181                 if(s != NULL)
 182                         *port_ptr=ntohs((unsigned short)s->s_port);
 183                 CRYPTO_w_unlock(CRYPTO_LOCK_GETSERVBYNAME);
 184                 if(s == NULL)
 185                         {
 186                         if (strcmp(str,"http") == 0)
 187                                 *port_ptr=80;
 188                         else if (strcmp(str,"telnet") == 0)
 189                                 *port_ptr=23;
 190                         else if (strcmp(str,"socks") == 0)
 191                                 *port_ptr=1080;
 192                         else if (strcmp(str,"https") == 0)
 193                                 *port_ptr=443;
 194                         else if (strcmp(str,"ssl") == 0)
 195                                 *port_ptr=443;
 196                         else if (strcmp(str,"ftp") == 0)
 197                                 *port_ptr=21;
 198                         else if (strcmp(str,"gopher") == 0)
 199                                 *port_ptr=70;
 200 #if 0
 201                         else if (strcmp(str,"wais") == 0)
 202                                 *port_ptr=21;
 203 #endif
 204                         else
 205                                 {
 206                                 SYSerr(SYS_F_GETSERVBYNAME,get_last_socket_error());
 207                                 ERR_add_error_data(3,"service='",str,"'");
 208                                 return(0);
 209                                 }
 210                         }
 211                 }
 212         return(1);
 213         }
 214
 215 int BIO_sock_error(int sock)
 216         {
 217         int j,i;
 218         int size;
 219
 220         size=sizeof(int);
 221         /* Note: under Windows the third parameter is of type (char *)
 222          * whereas under other systems it is (void *) if you don't have
 223          * a cast it will choke the compiler: if you do have a cast then
 224          * you can either go for (char *) or (void *).
 225          */
 226         i=getsockopt(sock,SOL_SOCKET,SO_ERROR,(void *)&j,(void *)&size);
 227         if (i < 0)
 228                 return(1);
 229         else
 230                 return(j);
 231         }
 232
 233 long BIO_ghbn_ctrl(int cmd, int iarg, char *parg)
 234         {
 235         int i;
 236         char **p;
 237
 238         switch (cmd)
 239                 {
 240         case BIO_GHBN_CTRL_HITS:
 241                 return(BIO_ghbn_hits);
 242                 /* break; */
 243         case BIO_GHBN_CTRL_MISSES:
 244                 return(BIO_ghbn_miss);
 245                 /* break; */
 246         case BIO_GHBN_CTRL_CACHE_SIZE:
 247                 return(GHBN_NUM);
 248                 /* break; */
 249         case BIO_GHBN_CTRL_GET_ENTRY:
 250                 if ((iarg >= 0) && (iarg <GHBN_NUM) &&
 251                         (ghbn_cache[iarg].order > 0))
 252                         {
 253                         p=(char **)parg;
 254                         if (p == NULL) return(0);
 255                         *p=ghbn_cache[iarg].name;
 256                         ghbn_cache[iarg].name[128]='\0';
 257                         return(1);
 258                         }
 259                 return(0);
 260                 /* break; */
 261         case BIO_GHBN_CTRL_FLUSH:
 262                 for (i=0; i<GHBN_NUM; i++)
 263                         ghbn_cache[i].order=0;
 264                 break;
 265         default:
 266                 return(0);
 267                 }
 268         return(1);
 269         }
 270
 271 #if 0
 272 static struct hostent *ghbn_dup(struct hostent *a)
 273         {
 274         struct hostent *ret;
 275         int i,j;
 276
 277         MemCheck_off();
 278         ret=(struct hostent *)OPENSSL_malloc(sizeof(struct hostent));
 279         if (ret == NULL) return(NULL);
 280         memset(ret,0,sizeof(struct hostent));
 281
 282         for (i=0; a->h_aliases[i] != NULL; i++)
 283                 ;
 284         i++;
 285         ret->h_aliases = (char **)OPENSSL_malloc(i*sizeof(char *));
 286         if (ret->h_aliases == NULL)
 287                 goto err;
 288         memset(ret->h_aliases, 0, i*sizeof(char *));
 289
 290         for (i=0; a->h_addr_list[i] != NULL; i++)
 291                 ;
 292         i++;
 293         ret->h_addr_list=(char **)OPENSSL_malloc(i*sizeof(char *));
 294         if (ret->h_addr_list == NULL)
 295                 goto err;
 296         memset(ret->h_addr_list, 0, i*sizeof(char *));
 297
 298         j=strlen(a->h_name)+1;
 299         if ((ret->h_name=OPENSSL_malloc(j)) == NULL) goto err;
 300         memcpy((char *)ret->h_name,a->h_name,j);
 301         for (i=0; a->h_aliases[i] != NULL; i++)
 302                 {
 303                 j=strlen(a->h_aliases[i])+1;
 304                 if ((ret->h_aliases[i]=OPENSSL_malloc(j)) == NULL) goto err;
 305                 memcpy(ret->h_aliases[i],a->h_aliases[i],j);
 306                 }
 307         ret->h_length=a->h_length;
 308         ret->h_addrtype=a->h_addrtype;
 309         for (i=0; a->h_addr_list[i] != NULL; i++)
 310                 {
 311                 if ((ret->h_addr_list[i]=OPENSSL_malloc(a->h_length)) == NULL)
 312                         goto err;
 313                 memcpy(ret->h_addr_list[i],a->h_addr_list[i],a->h_length);
 314                 }
 315         if (0)
 316                 {
 317 err:
 318                 if (ret != NULL)
 319                         ghbn_free(ret);
 320                 ret=NULL;
 321                 }
 322         MemCheck_on();
 323         return(ret);
 324         }
 325
 326 static void ghbn_free(struct hostent *a)
 327         {
 328         int i;
 329
 330         if(a == NULL)
 331             return;
 332
 333         if (a->h_aliases != NULL)
 334                 {
 335                 for (i=0; a->h_aliases[i] != NULL; i++)
 336                         OPENSSL_free(a->h_aliases[i]);
 337                 OPENSSL_free(a->h_aliases);
 338                 }
 339         if (a->h_addr_list != NULL)
 340                 {
 341                 for (i=0; a->h_addr_list[i] != NULL; i++)
 342                         OPENSSL_free(a->h_addr_list[i]);
 343                 OPENSSL_free(a->h_addr_list);
 344                 }
 345         if (a->h_name != NULL) OPENSSL_free(a->h_name);
 346         OPENSSL_free(a);
 347         }
 348
 349 #endif
 350
 351 struct hostent *BIO_gethostbyname(const char *name)
 352         {
 353 #if 1
 354         /* Caching gethostbyname() results forever is wrong,
 355          * so we have to let the true gethostbyname() worry about this */
 356         return gethostbyname(name);
 357 #else
 358         struct hostent *ret;
 359         int i,lowi=0,j;
 360         unsigned long low= (unsigned long)-1;
 361
 362
 363 #  if 0
 364         /* It doesn't make sense to use locking here: The function interface
 365          * is not thread-safe, because threads can never be sure when
 366          * some other thread destroys the data they were given a pointer to.
 367          */
 368         CRYPTO_w_lock(CRYPTO_LOCK_GETHOSTBYNAME);
 369 #  endif
 370         j=strlen(name);
 371         if (j < 128)
 372                 {
 373                 for (i=0; i<GHBN_NUM; i++)
 374                         {
 375                         if (low > ghbn_cache[i].order)
 376                                 {
 377                                 low=ghbn_cache[i].order;
 378                                 lowi=i;
 379                                 }
 380                         if (ghbn_cache[i].order > 0)
 381                                 {
 382                                 if (strncmp(name,ghbn_cache[i].name,128) == 0)
 383                                         break;
 384                                 }
 385                         }
 386                 }
 387         else
 388                 i=GHBN_NUM;
 389
 390         if (i == GHBN_NUM) /* no hit*/
 391                 {
 392                 BIO_ghbn_miss++;
 393                 /* Note: under VMS with SOCKETSHR, it seems like the first
 394                  * parameter is 'char *', instead of 'const char *'
 395                  */
 396                 ret=gethostbyname(
 397 #  ifndef CONST_STRICT
 398                     (char *)
 399 #  endif
 400                     name);
 401
 402                 if (ret == NULL)
 403                         goto end;
 404                 if (j > 128) /* too big to cache */
 405                         {
 406 #  if 0
 407                         /* If we were trying to make this function thread-safe (which
 408                          * is bound to fail), we'd have to give up in this case
 409                          * (or allocate more memory). */
 410                         ret = NULL;
 411 #  endif
 412                         goto end;
 413                         }
 414
 415                 /* else add to cache */
 416                 if (ghbn_cache[lowi].ent != NULL)
 417                         ghbn_free(ghbn_cache[lowi].ent); /* XXX not thread-safe */
 418                 ghbn_cache[lowi].name[0] = '\0';
 419
 420                 if((ret=ghbn_cache[lowi].ent=ghbn_dup(ret)) == NULL)
 421                         {
 422                         BIOerr(BIO_F_BIO_GETHOSTBYNAME,ERR_R_MALLOC_FAILURE);
 423                         goto end;
 424                         }
 425                 strncpy(ghbn_cache[lowi].name,name,128);
 426                 ghbn_cache[lowi].order=BIO_ghbn_miss+BIO_ghbn_hits;
 427                 }
 428         else
 429                 {
 430                 BIO_ghbn_hits++;
 431                 ret= ghbn_cache[i].ent;
 432                 ghbn_cache[i].order=BIO_ghbn_miss+BIO_ghbn_hits;
 433                 }
 434 end:
 435 #  if 0
 436         CRYPTO_w_unlock(CRYPTO_LOCK_GETHOSTBYNAME);
 437 #  endif
 438         return(ret);
 439 #endif
 440         }
 441
 442
 443 int BIO_sock_init(void)
 444         {
 445 #ifdef OPENSSL_SYS_WINDOWS
 446         static struct WSAData wsa_state;
 447
 448         if (!wsa_init_done)
 449                 {
 450                 int err;
 451
 452 #ifdef SIGINT
 453                 signal(SIGINT,(void (*)(int))BIO_sock_cleanup);
 454 #endif
 455                 wsa_init_done=1;
 456                 memset(&wsa_state,0,sizeof(wsa_state));
 457                 if (WSAStartup(0x0101,&wsa_state)!=0)
 458                         {
 459                         err=WSAGetLastError();
 460                         SYSerr(SYS_F_WSASTARTUP,err);
 461                         BIOerr(BIO_F_BIO_SOCK_INIT,BIO_R_WSASTARTUP);
 462                         return(-1);
 463                         }
 464                 }
 465 #endif /* OPENSSL_SYS_WINDOWS */
 466         return(1);
 467         }
 468
 469 void BIO_sock_cleanup(void)
 470         {
 471 #ifdef OPENSSL_SYS_WINDOWS
 472         if (wsa_init_done)
 473                 {
 474                 wsa_init_done=0;
 475                 WSACancelBlockingCall();
 476                 WSACleanup();
 477                 }
 478 #endif
 479         }
 480
 481 #if !defined(OPENSSL_SYS_VMS) || __VMS_VER >= 70000000
 482
 483 int BIO_socket_ioctl(int fd, long type, unsigned long *arg)
 484         {
 485         int i;
 486
 487 #ifdef __DJGPP__
 488         i=ioctlsocket(fd,type,(char *)arg);
 489 #else
 490         i=ioctlsocket(fd,type,arg);
 491 #endif /* __DJGPP__ */
 492         if (i < 0)
 493                 SYSerr(SYS_F_IOCTLSOCKET,get_last_socket_error());
 494         return(i);
 495         }
 496 #endif /* __VMS_VER */
 497
 498 /* The reason I have implemented this instead of using sscanf is because
 499  * Visual C 1.52c gives an unresolved external when linking a DLL :-( */
 500 static int get_ip(const char *str, unsigned char ip[4])
 501         {
 502         unsigned int tmp[4];
 503         int num=0,c,ok=0;
 504
 505         tmp[0]=tmp[1]=tmp[2]=tmp[3]=0;
 506
 507         for (;;)
 508                 {
 509                 c= *(str++);
 510                 if ((c >= '0') && (c <= '9'))
 511                         {
 512                         ok=1;
 513                         tmp[num]=tmp[num]*10+c-'0';
 514                         if (tmp[num] > 255) return(0);
 515                         }
 516                 else if (c == '.')
 517                         {
 518                         if (!ok) return(-1);
 519                         if (num == 3) return(0);
 520                         num++;
 521                         ok=0;
 522                         }
 523                 else if (c == '\0' && (num == 3) && ok)
 524                         break;
 525                 else
 526                         return(0);
 527                 }
 528         ip[0]=tmp[0];
 529         ip[1]=tmp[1];
 530         ip[2]=tmp[2];
 531         ip[3]=tmp[3];
 532         return(1);
 533         }
 534
 535 int BIO_get_accept_socket(char *host, int bind_mode)
 536         {
 537         int ret=0;
 538         struct sockaddr_in server,client;
 539         int s=INVALID_SOCKET,cs;
 540         unsigned char ip[4];
 541         unsigned short port;
 542         char *str=NULL,*e;
 543         const char *h,*p;
 544         unsigned long l;
 545         int err_num;
 546
 547         if (BIO_sock_init() != 1) return(INVALID_SOCKET);
 548
 549         if ((str=BUF_strdup(host)) == NULL) return(INVALID_SOCKET);
 550
 551         h=p=NULL;
 552         h=str;
 553         for (e=str; *e; e++)
 554                 {
 555                 if (*e == ':')
 556                         {
 557                         p= &(e[1]);
 558                         *e='\0';
 559                         }
 560                 else if (*e == '/')
 561                         {
 562                         *e='\0';
 563                         break;
 564                         }
 565                 }
 566
 567         if (p == NULL)
 568                 {
 569                 p=h;
 570                 h="*";
 571                 }
 572
 573         if (!BIO_get_port(p,&port)) goto err;
 574
 575         memset((char *)&server,0,sizeof(server));
 576         server.sin_family=AF_INET;
 577         server.sin_port=htons(port);
 578
 579         if (strcmp(h,"*") == 0)
 580                 server.sin_addr.s_addr=INADDR_ANY;
 581         else
 582                 {
 583                 if (!BIO_get_host_ip(h,&(ip[0]))) goto err;
 584                 l=(unsigned long)
 585                         ((unsigned long)ip[0]<<24L)|
 586                         ((unsigned long)ip[1]<<16L)|
 587                         ((unsigned long)ip[2]<< 8L)|
 588                         ((unsigned long)ip[3]);
 589                 server.sin_addr.s_addr=htonl(l);
 590                 }
 591
 592 again:
 593         s=socket(AF_INET,SOCK_STREAM,SOCKET_PROTOCOL);
 594         if (s == INVALID_SOCKET)
 595                 {
 596                 SYSerr(SYS_F_SOCKET,get_last_socket_error());
 597                 ERR_add_error_data(3,"port='",host,"'");
 598                 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET,BIO_R_UNABLE_TO_CREATE_SOCKET);
 599                 goto err;
 600                 }
 601
 602 #ifdef SO_REUSEADDR
 603         if (bind_mode == BIO_BIND_REUSEADDR)
 604                 {
 605                 int i=1;
 606
 607                 ret=setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&i,sizeof(i));
 608                 bind_mode=BIO_BIND_NORMAL;
 609                 }
 610 #endif
 611         if (bind(s,(struct sockaddr *)&server,sizeof(server)) == -1)
 612                 {
 613 #ifdef SO_REUSEADDR
 614                 err_num=get_last_socket_error();
 615                 if ((bind_mode == BIO_BIND_REUSEADDR_IF_UNUSED) &&
 616                         (err_num == EADDRINUSE))
 617                         {
 618                         memcpy((char *)&client,(char *)&server,sizeof(server));
 619                         if (strcmp(h,"*") == 0)
 620                                 client.sin_addr.s_addr=htonl(0x7F000001);
 621                         cs=socket(AF_INET,SOCK_STREAM,SOCKET_PROTOCOL);
 622                         if (cs != INVALID_SOCKET)
 623                                 {
 624                                 int ii;
 625                                 ii=connect(cs,(struct sockaddr *)&client,
 626                                         sizeof(client));
 627                                 closesocket(cs);
 628                                 if (ii == INVALID_SOCKET)
 629                                         {
 630                                         bind_mode=BIO_BIND_REUSEADDR;
 631                                         closesocket(s);
 632                                         goto again;
 633                                         }
 634                                 /* else error */
 635                                 }
 636                         /* else error */
 637                         }
 638 #endif
 639                 SYSerr(SYS_F_BIND,err_num);
 640                 ERR_add_error_data(3,"port='",host,"'");
 641                 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET,BIO_R_UNABLE_TO_BIND_SOCKET);
 642                 goto err;
 643                 }
 644         if (listen(s,MAX_LISTEN) == -1)
 645                 {
 646                 SYSerr(SYS_F_BIND,get_last_socket_error());
 647                 ERR_add_error_data(3,"port='",host,"'");
 648                 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET,BIO_R_UNABLE_TO_LISTEN_SOCKET);
 649                 goto err;
 650                 }
 651         ret=1;
 652 err:
 653         if (str != NULL) OPENSSL_free(str);
 654         if ((ret == 0) && (s != INVALID_SOCKET))
 655                 {
 656                 closesocket(s);
 657                 s= INVALID_SOCKET;
 658                 }
 659         return(s);
 660         }
 661
 662 int BIO_accept(int sock, char **addr)
 663         {
 664         int ret=INVALID_SOCKET;
 665         static struct sockaddr_in from;
 666         unsigned long l;
 667         unsigned short port;
 668         int len;
 669         char *p;
 670
 671         memset((char *)&from,0,sizeof(from));
 672         len=sizeof(from);
 673         /* Note: under VMS with SOCKETSHR the fourth parameter is currently
 674          * of type (int *) whereas under other systems it is (void *) if
 675          * you don't have a cast it will choke the compiler: if you do
 676          * have a cast then you can either go for (int *) or (void *).
 677          */
 678         ret=accept(sock,(struct sockaddr *)&from,(void *)&len);
 679         if (ret == INVALID_SOCKET)
 680                 {
 681                 if(BIO_sock_should_retry(ret)) return -2;
 682                 SYSerr(SYS_F_ACCEPT,get_last_socket_error());
 683                 BIOerr(BIO_F_BIO_ACCEPT,BIO_R_ACCEPT_ERROR);
 684                 goto end;
 685                 }
 686
 687         if (addr == NULL) goto end;
 688
 689         l=ntohl(from.sin_addr.s_addr);
 690         port=ntohs(from.sin_port);
 691         if (*addr == NULL)
 692                 {
 693                 if ((p=OPENSSL_malloc(24)) == NULL)
 694                         {
 695                         BIOerr(BIO_F_BIO_ACCEPT,ERR_R_MALLOC_FAILURE);
 696                         goto end;
 697                         }
 698                 *addr=p;
 699                 }
 700         sprintf(*addr,"%d.%d.%d.%d:%d",
 701                 (unsigned char)(l>>24L)&0xff,
 702                 (unsigned char)(l>>16L)&0xff,
 703                 (unsigned char)(l>> 8L)&0xff,
 704                 (unsigned char)(l     )&0xff,
 705                 port);
 706 end:
 707         return(ret);
 708         }
 709
 710 int BIO_set_tcp_ndelay(int s, int on)
 711         {
 712         int ret=0;
 713 #if defined(TCP_NODELAY) && (defined(IPPROTO_TCP) || defined(SOL_TCP))
 714         int opt;
 715
 716 #ifdef SOL_TCP
 717         opt=SOL_TCP;
 718 #else
 719 #ifdef IPPROTO_TCP
 720         opt=IPPROTO_TCP;
 721 #endif
 722 #endif
 723
 724         ret=setsockopt(s,opt,TCP_NODELAY,(char *)&on,sizeof(on));
 725 #endif
 726         return(ret == 0);
 727         }
 728 #endif
 729
 730 int BIO_socket_nbio(int s, int mode)
 731         {
 732         int ret= -1;
 733         unsigned long l;
 734
 735         l=mode;
 736 #ifdef FIONBIO
 737         ret=BIO_socket_ioctl(s,FIONBIO,&l);
 738 #endif
 739         return(ret == 0);
 740         }