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