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