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