crypto/bio/b_sock.c

   1 /* crypto/bio/b_sock.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include <stdlib.h>
  61 #include <errno.h>
  62 #define USE_SOCKETS
  63 #include "cryptlib.h"
  64 #include <openssl/bio.h>
  65 #if defined(OPENSSL_SYS_NETWARE) && defined(NETWARE_BSDSOCK)
  66 #include "netdb.h"
  67 #endif
  68
  69 #ifndef OPENSSL_NO_SOCK
  70
  71 #include <openssl/dso.h>
  72
  73 #define SOCKET_PROTOCOL IPPROTO_TCP
  74
  75 #ifdef SO_MAXCONN
  76 #define MAX_LISTEN  SO_MAXCONN
  77 #elif defined(SOMAXCONN)
  78 #define MAX_LISTEN  SOMAXCONN
  79 #else
  80 #define MAX_LISTEN  32
  81 #endif
  82
  83 #if defined(OPENSSL_SYS_WINDOWS) || (defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK))
  84 static int wsa_init_done=0;
  85 #endif
  86
  87 #if defined(OPENSSL_SYS_BEOS_BONE)
  88 /* BONE's IP6 support is incomplete */
  89 #undef AF_INET6
  90 #endif
  91
  92 #if 0
  93 static unsigned long BIO_ghbn_hits=0L;
  94 static unsigned long BIO_ghbn_miss=0L;
  95
  96 #define GHBN_NUM        4
  97 static struct ghbn_cache_st
  98         {
  99         char name[129];
 100         struct hostent *ent;
 101         unsigned long order;
 102         } ghbn_cache[GHBN_NUM];
 103 #endif
 104
 105 static int get_ip(const char *str,unsigned char *ip);
 106 #if 0
 107 static void ghbn_free(struct hostent *a);
 108 static struct hostent *ghbn_dup(struct hostent *a);
 109 #endif
 110 int BIO_get_host_ip(const char *str, unsigned char *ip)
 111         {
 112         int i;
 113         int err = 1;
 114         int locked = 0;
 115         struct hostent *he;
 116
 117         i=get_ip(str,ip);
 118         if (i < 0)
 119                 {
 120                 BIOerr(BIO_F_BIO_GET_HOST_IP,BIO_R_INVALID_IP_ADDRESS);
 121                 goto err;
 122                 }
 123
 124         /* At this point, we have something that is most probably correct
 125            in some way, so let's init the socket. */
 126         if (BIO_sock_init() != 1)
 127                 return 0; /* don't generate another error code here */
 128
 129         /* If the string actually contained an IP address, we need not do
 130            anything more */
 131         if (i > 0) return(1);
 132
 133         /* do a gethostbyname */
 134         CRYPTO_w_lock(CRYPTO_LOCK_GETHOSTBYNAME);
 135         locked = 1;
 136         he=BIO_gethostbyname(str);
 137         if (he == NULL)
 138                 {
 139                 BIOerr(BIO_F_BIO_GET_HOST_IP,BIO_R_BAD_HOSTNAME_LOOKUP);
 140                 goto err;
 141                 }
 142
 143         /* cast to short because of win16 winsock definition */
 144         if ((short)he->h_addrtype != AF_INET)
 145                 {
 146                 BIOerr(BIO_F_BIO_GET_HOST_IP,BIO_R_GETHOSTBYNAME_ADDR_IS_NOT_AF_INET);
 147                 goto err;
 148                 }
 149         for (i=0; i<4; i++)
 150                 ip[i]=he->h_addr_list[0][i];
 151         err = 0;
 152
 153  err:
 154         if (locked)
 155                 CRYPTO_w_unlock(CRYPTO_LOCK_GETHOSTBYNAME);
 156         if (err)
 157                 {
 158                 ERR_add_error_data(2,"host=",str);
 159                 return 0;
 160                 }
 161         else
 162                 return 1;
 163         }
 164
 165 int BIO_get_port(const char *str, unsigned short *port_ptr)
 166         {
 167         int i;
 168         struct servent *s;
 169
 170         if (str == NULL)
 171                 {
 172                 BIOerr(BIO_F_BIO_GET_PORT,BIO_R_NO_PORT_DEFINED);
 173                 return(0);
 174                 }
 175         i=atoi(str);
 176         if (i != 0)
 177                 *port_ptr=(unsigned short)i;
 178         else
 179                 {
 180                 CRYPTO_w_lock(CRYPTO_LOCK_GETSERVBYNAME);
 181                 /* Note: under VMS with SOCKETSHR, it seems like the first
 182                  * parameter is 'char *', instead of 'const char *'
 183                  */
 184                 s=getservbyname(
 185 #ifndef CONST_STRICT
 186                     (char *)
 187 #endif
 188                     str,"tcp");
 189                 if(s != NULL)
 190                         *port_ptr=ntohs((unsigned short)s->s_port);
 191                 CRYPTO_w_unlock(CRYPTO_LOCK_GETSERVBYNAME);
 192                 if(s == NULL)
 193                         {
 194                         if (strcmp(str,"http") == 0)
 195                                 *port_ptr=80;
 196                         else if (strcmp(str,"telnet") == 0)
 197                                 *port_ptr=23;
 198                         else if (strcmp(str,"socks") == 0)
 199                                 *port_ptr=1080;
 200                         else if (strcmp(str,"https") == 0)
 201                                 *port_ptr=443;
 202                         else if (strcmp(str,"ssl") == 0)
 203                                 *port_ptr=443;
 204                         else if (strcmp(str,"ftp") == 0)
 205                                 *port_ptr=21;
 206                         else if (strcmp(str,"gopher") == 0)
 207                                 *port_ptr=70;
 208 #if 0
 209                         else if (strcmp(str,"wais") == 0)
 210                                 *port_ptr=21;
 211 #endif
 212                         else
 213                                 {
 214                                 SYSerr(SYS_F_GETSERVBYNAME,get_last_socket_error());
 215                                 ERR_add_error_data(3,"service='",str,"'");
 216                                 return(0);
 217                                 }
 218                         }
 219                 }
 220         return(1);
 221         }
 222
 223 int BIO_sock_error(int sock)
 224         {
 225         int j,i;
 226         int size;
 227
 228 #if defined(OPENSSL_SYS_BEOS_R5)
 229         return 0;
 230 #endif
 231
 232         size=sizeof(int);
 233         /* Note: under Windows the third parameter is of type (char *)
 234          * whereas under other systems it is (void *) if you don't have
 235          * a cast it will choke the compiler: if you do have a cast then
 236          * you can either go for (char *) or (void *).
 237          */
 238         i=getsockopt(sock,SOL_SOCKET,SO_ERROR,(void *)&j,(void *)&size);
 239         if (i < 0)
 240                 return(1);
 241         else
 242                 return(j);
 243         }
 244
 245 #if 0
 246 long BIO_ghbn_ctrl(int cmd, int iarg, char *parg)
 247         {
 248         int i;
 249         char **p;
 250
 251         switch (cmd)
 252                 {
 253         case BIO_GHBN_CTRL_HITS:
 254                 return(BIO_ghbn_hits);
 255                 /* break; */
 256         case BIO_GHBN_CTRL_MISSES:
 257                 return(BIO_ghbn_miss);
 258                 /* break; */
 259         case BIO_GHBN_CTRL_CACHE_SIZE:
 260                 return(GHBN_NUM);
 261                 /* break; */
 262         case BIO_GHBN_CTRL_GET_ENTRY:
 263                 if ((iarg >= 0) && (iarg <GHBN_NUM) &&
 264                         (ghbn_cache[iarg].order > 0))
 265                         {
 266                         p=(char **)parg;
 267                         if (p == NULL) return(0);
 268                         *p=ghbn_cache[iarg].name;
 269                         ghbn_cache[iarg].name[128]='\0';
 270                         return(1);
 271                         }
 272                 return(0);
 273                 /* break; */
 274         case BIO_GHBN_CTRL_FLUSH:
 275                 for (i=0; i<GHBN_NUM; i++)
 276                         ghbn_cache[i].order=0;
 277                 break;
 278         default:
 279                 return(0);
 280                 }
 281         return(1);
 282         }
 283 #endif
 284
 285 #if 0
 286 static struct hostent *ghbn_dup(struct hostent *a)
 287         {
 288         struct hostent *ret;
 289         int i,j;
 290
 291         MemCheck_off();
 292         ret=(struct hostent *)OPENSSL_malloc(sizeof(struct hostent));
 293         if (ret == NULL) return(NULL);
 294         memset(ret,0,sizeof(struct hostent));
 295
 296         for (i=0; a->h_aliases[i] != NULL; i++)
 297                 ;
 298         i++;
 299         ret->h_aliases = (char **)OPENSSL_malloc(i*sizeof(char *));
 300         if (ret->h_aliases == NULL)
 301                 goto err;
 302         memset(ret->h_aliases, 0, i*sizeof(char *));
 303
 304         for (i=0; a->h_addr_list[i] != NULL; i++)
 305                 ;
 306         i++;
 307         ret->h_addr_list=(char **)OPENSSL_malloc(i*sizeof(char *));
 308         if (ret->h_addr_list == NULL)
 309                 goto err;
 310         memset(ret->h_addr_list, 0, i*sizeof(char *));
 311
 312         j=strlen(a->h_name)+1;
 313         if ((ret->h_name=OPENSSL_malloc(j)) == NULL) goto err;
 314         memcpy((char *)ret->h_name,a->h_name,j);
 315         for (i=0; a->h_aliases[i] != NULL; i++)
 316                 {
 317                 j=strlen(a->h_aliases[i])+1;
 318                 if ((ret->h_aliases[i]=OPENSSL_malloc(j)) == NULL) goto err;
 319                 memcpy(ret->h_aliases[i],a->h_aliases[i],j);
 320                 }
 321         ret->h_length=a->h_length;
 322         ret->h_addrtype=a->h_addrtype;
 323         for (i=0; a->h_addr_list[i] != NULL; i++)
 324                 {
 325                 if ((ret->h_addr_list[i]=OPENSSL_malloc(a->h_length)) == NULL)
 326                         goto err;
 327                 memcpy(ret->h_addr_list[i],a->h_addr_list[i],a->h_length);
 328                 }
 329         if (0)
 330                 {
 331 err:
 332                 if (ret != NULL)
 333                         ghbn_free(ret);
 334                 ret=NULL;
 335                 }
 336         MemCheck_on();
 337         return(ret);
 338         }
 339
 340 static void ghbn_free(struct hostent *a)
 341         {
 342         int i;
 343
 344         if(a == NULL)
 345             return;
 346
 347         if (a->h_aliases != NULL)
 348                 {
 349                 for (i=0; a->h_aliases[i] != NULL; i++)
 350                         OPENSSL_free(a->h_aliases[i]);
 351                 OPENSSL_free(a->h_aliases);
 352                 }
 353         if (a->h_addr_list != NULL)
 354                 {
 355                 for (i=0; a->h_addr_list[i] != NULL; i++)
 356                         OPENSSL_free(a->h_addr_list[i]);
 357                 OPENSSL_free(a->h_addr_list);
 358                 }
 359         if (a->h_name != NULL) OPENSSL_free(a->h_name);
 360         OPENSSL_free(a);
 361         }
 362
 363 #endif
 364
 365 struct hostent *BIO_gethostbyname(const char *name)
 366         {
 367 #if 1
 368         /* Caching gethostbyname() results forever is wrong,
 369          * so we have to let the true gethostbyname() worry about this */
 370         return gethostbyname(name);
 371 #else
 372         struct hostent *ret;
 373         int i,lowi=0,j;
 374         unsigned long low= (unsigned long)-1;
 375
 376
 377 #  if 0
 378         /* It doesn't make sense to use locking here: The function interface
 379          * is not thread-safe, because threads can never be sure when
 380          * some other thread destroys the data they were given a pointer to.
 381          */
 382         CRYPTO_w_lock(CRYPTO_LOCK_GETHOSTBYNAME);
 383 #  endif
 384         j=strlen(name);
 385         if (j < 128)
 386                 {
 387                 for (i=0; i<GHBN_NUM; i++)
 388                         {
 389                         if (low > ghbn_cache[i].order)
 390                                 {
 391                                 low=ghbn_cache[i].order;
 392                                 lowi=i;
 393                                 }
 394                         if (ghbn_cache[i].order > 0)
 395                                 {
 396                                 if (strncmp(name,ghbn_cache[i].name,128) == 0)
 397                                         break;
 398                                 }
 399                         }
 400                 }
 401         else
 402                 i=GHBN_NUM;
 403
 404         if (i == GHBN_NUM) /* no hit*/
 405                 {
 406                 BIO_ghbn_miss++;
 407                 /* Note: under VMS with SOCKETSHR, it seems like the first
 408                  * parameter is 'char *', instead of 'const char *'
 409                  */
 410                 ret=gethostbyname(
 411 #  ifndef CONST_STRICT
 412                     (char *)
 413 #  endif
 414                     name);
 415
 416                 if (ret == NULL)
 417                         goto end;
 418                 if (j > 128) /* too big to cache */
 419                         {
 420 #  if 0
 421                         /* If we were trying to make this function thread-safe (which
 422                          * is bound to fail), we'd have to give up in this case
 423                          * (or allocate more memory). */
 424                         ret = NULL;
 425 #  endif
 426                         goto end;
 427                         }
 428
 429                 /* else add to cache */
 430                 if (ghbn_cache[lowi].ent != NULL)
 431                         ghbn_free(ghbn_cache[lowi].ent); /* XXX not thread-safe */
 432                 ghbn_cache[lowi].name[0] = '\0';
 433
 434                 if((ret=ghbn_cache[lowi].ent=ghbn_dup(ret)) == NULL)
 435                         {
 436                         BIOerr(BIO_F_BIO_GETHOSTBYNAME,ERR_R_MALLOC_FAILURE);
 437                         goto end;
 438                         }
 439                 strncpy(ghbn_cache[lowi].name,name,128);
 440                 ghbn_cache[lowi].order=BIO_ghbn_miss+BIO_ghbn_hits;
 441                 }
 442         else
 443                 {
 444                 BIO_ghbn_hits++;
 445                 ret= ghbn_cache[i].ent;
 446                 ghbn_cache[i].order=BIO_ghbn_miss+BIO_ghbn_hits;
 447                 }
 448 end:
 449 #  if 0
 450         CRYPTO_w_unlock(CRYPTO_LOCK_GETHOSTBYNAME);
 451 #  endif
 452         return(ret);
 453 #endif
 454         }
 455
 456
 457 int BIO_sock_init(void)
 458         {
 459 #ifdef OPENSSL_SYS_WINDOWS
 460         static struct WSAData wsa_state;
 461
 462         if (!wsa_init_done)
 463                 {
 464                 int err;
 465
 466 #ifdef SIGINT
 467                 signal(SIGINT,(void (*)(int))BIO_sock_cleanup);
 468 #endif
 469                 wsa_init_done=1;
 470                 memset(&wsa_state,0,sizeof(wsa_state));
 471                 /* Not making wsa_state available to the rest of the
 472                  * code is formally wrong. But the structures we use
 473                  * are [beleived to be] invariable among Winsock DLLs,
 474                  * while API availability is [expected to be] probed
 475                  * at run-time with DSO_global_lookup. */
 476                 if (WSAStartup(0x0202,&wsa_state)!=0)
 477                         {
 478                         err=WSAGetLastError();
 479                         SYSerr(SYS_F_WSASTARTUP,err);
 480                         BIOerr(BIO_F_BIO_SOCK_INIT,BIO_R_WSASTARTUP);
 481                         return(-1);
 482                         }
 483                 }
 484 #endif /* OPENSSL_SYS_WINDOWS */
 485 #ifdef WATT32
 486         extern int _watt_do_exit;
 487         _watt_do_exit = 0;    /* don't make sock_init() call exit() */
 488         if (sock_init())
 489                 return (-1);
 490 #endif
 491
 492 #if defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK)
 493     WORD wVerReq;
 494     WSADATA wsaData;
 495     int err;
 496
 497     if (!wsa_init_done)
 498     {
 499
 500 # ifdef SIGINT
 501         signal(SIGINT,(void (*)(int))BIO_sock_cleanup);
 502 # endif
 503
 504         wsa_init_done=1;
 505         wVerReq = MAKEWORD( 2, 0 );
 506         err = WSAStartup(wVerReq,&wsaData);
 507         if (err != 0)
 508         {
 509             SYSerr(SYS_F_WSASTARTUP,err);
 510             BIOerr(BIO_F_BIO_SOCK_INIT,BIO_R_WSASTARTUP);
 511             return(-1);
 512                         }
 513                 }
 514 #endif
 515
 516         return(1);
 517         }
 518
 519 void BIO_sock_cleanup(void)
 520         {
 521 #ifdef OPENSSL_SYS_WINDOWS
 522         if (wsa_init_done)
 523                 {
 524                 wsa_init_done=0;
 525 #ifndef OPENSSL_SYS_WINCE
 526                 WSACancelBlockingCall();
 527 #endif
 528                 WSACleanup();
 529                 }
 530 #elif defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK)
 531    if (wsa_init_done)
 532         {
 533         wsa_init_done=0;
 534         WSACleanup();
 535                 }
 536 #endif
 537         }
 538
 539 #if !defined(OPENSSL_SYS_VMS) || __VMS_VER >= 70000000
 540
 541 int BIO_socket_ioctl(int fd, long type, void *arg)
 542         {
 543         int i;
 544
 545 #ifdef __DJGPP__
 546         i=ioctlsocket(fd,type,(char *)arg);
 547 #else
 548         i=ioctlsocket(fd,type,arg);
 549 #endif /* __DJGPP__ */
 550         if (i < 0)
 551                 SYSerr(SYS_F_IOCTLSOCKET,get_last_socket_error());
 552         return(i);
 553         }
 554 #endif /* __VMS_VER */
 555
 556 /* The reason I have implemented this instead of using sscanf is because
 557  * Visual C 1.52c gives an unresolved external when linking a DLL :-( */
 558 static int get_ip(const char *str, unsigned char ip[4])
 559         {
 560         unsigned int tmp[4];
 561         int num=0,c,ok=0;
 562
 563         tmp[0]=tmp[1]=tmp[2]=tmp[3]=0;
 564
 565         for (;;)
 566                 {
 567                 c= *(str++);
 568                 if ((c >= '0') && (c <= '9'))
 569                         {
 570                         ok=1;
 571                         tmp[num]=tmp[num]*10+c-'0';
 572                         if (tmp[num] > 255) return(0);
 573                         }
 574                 else if (c == '.')
 575                         {
 576                         if (!ok) return(-1);
 577                         if (num == 3) return(0);
 578                         num++;
 579                         ok=0;
 580                         }
 581                 else if (c == '\0' && (num == 3) && ok)
 582                         break;
 583                 else
 584                         return(0);
 585                 }
 586         ip[0]=tmp[0];
 587         ip[1]=tmp[1];
 588         ip[2]=tmp[2];
 589         ip[3]=tmp[3];
 590         return(1);
 591         }
 592
 593 int BIO_get_accept_socket(char *host, int bind_mode)
 594         {
 595         int ret=0;
 596         struct sockaddr server,client;
 597         struct sockaddr_in *sa_in;
 598         int s=INVALID_SOCKET,cs;
 599         unsigned char ip[4];
 600         unsigned short port;
 601         char *str=NULL,*e;
 602         char *h,*p;
 603         unsigned long l;
 604         int err_num;
 605
 606         if (BIO_sock_init() != 1) return(INVALID_SOCKET);
 607
 608         if ((str=BUF_strdup(host)) == NULL) return(INVALID_SOCKET);
 609
 610         h=p=NULL;
 611         h=str;
 612         for (e=str; *e; e++)
 613                 {
 614                 if (*e == ':')
 615                         {
 616                         p=e;
 617                         }
 618                 else if (*e == '/')
 619                         {
 620                         *e='\0';
 621                         break;
 622                         }
 623                 }
 624         if (p)  *p++='\0';      /* points at last ':', '::port' is special [see below] */
 625         else    p=h,h=NULL;
 626
 627 #ifdef EAI_FAMILY
 628         do {
 629         static union {  void *p;
 630                         int (*f)(const char *,const char *,
 631                                  const struct addrinfo *,
 632                                  struct addrinfo **);
 633                         } p_getaddrinfo = {NULL};
 634         static union {  void *p;
 635                         void (*f)(struct addrinfo *);
 636                         } p_freeaddrinfo = {NULL};
 637         struct addrinfo *res,hint;
 638
 639         if (p_getaddrinfo.p==NULL)
 640                 {
 641                 if ((p_getaddrinfo.p=DSO_global_lookup("getaddrinfo"))==NULL ||
 642                     (p_freeaddrinfo.p=DSO_global_lookup("freeaddrinfo"))==NULL)
 643                         p_getaddrinfo.p=(void*)-1;
 644                 }
 645         if (p_getaddrinfo.p==(void *)-1) break;
 646
 647         /* '::port' enforces IPv6 wildcard listener. Some OSes,
 648          * e.g. Solaris, default to IPv6 without any hint. Also
 649          * note that commonly IPv6 wildchard socket can service
 650          * IPv4 connections just as well...  */
 651         memset(&hint,0,sizeof(hint));
 652         if (h)
 653                 {
 654                 if (strchr(h,':'))
 655                         {
 656                         if (h[1]=='\0') h=NULL;
 657 #ifdef AF_INET6
 658                         hint.ai_family = AF_INET6;
 659 #else
 660                         h=NULL;
 661 #endif
 662                         }
 663                 else if (h[0]=='*' && h[1]=='\0')
 664                         h=NULL;
 665                 }
 666
 667         if ((*p_getaddrinfo.f)(h,p,&hint,&res)) break;
 668         server = *res->ai_addr;
 669         (*p_freeaddrinfo.f)(res);
 670         goto again;
 671         } while (0);
 672 #endif
 673
 674         if (!BIO_get_port(p,&port)) goto err;
 675
 676         memset((char *)&server,0,sizeof(server));
 677         sa_in = (struct sockaddr_in *)&server;
 678         sa_in->sin_family=AF_INET;
 679         sa_in->sin_port=htons(port);
 680
 681         if (h == NULL || strcmp(h,"*") == 0)
 682                 sa_in->sin_addr.s_addr=INADDR_ANY;
 683         else
 684                 {
 685                 if (!BIO_get_host_ip(h,&(ip[0]))) goto err;
 686                 l=(unsigned long)
 687                         ((unsigned long)ip[0]<<24L)|
 688                         ((unsigned long)ip[1]<<16L)|
 689                         ((unsigned long)ip[2]<< 8L)|
 690                         ((unsigned long)ip[3]);
 691                 sa_in->sin_addr.s_addr=htonl(l);
 692                 }
 693
 694 again:
 695         s=socket(server.sa_family,SOCK_STREAM,SOCKET_PROTOCOL);
 696         if (s == INVALID_SOCKET)
 697                 {
 698                 SYSerr(SYS_F_SOCKET,get_last_socket_error());
 699                 ERR_add_error_data(3,"port='",host,"'");
 700                 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET,BIO_R_UNABLE_TO_CREATE_SOCKET);
 701                 goto err;
 702                 }
 703
 704 #ifdef SO_REUSEADDR
 705         if (bind_mode == BIO_BIND_REUSEADDR)
 706                 {
 707                 int i=1;
 708
 709                 ret=setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&i,sizeof(i));
 710                 bind_mode=BIO_BIND_NORMAL;
 711                 }
 712 #endif
 713         if (bind(s,&server,sizeof(server)) == -1)
 714                 {
 715 #ifdef SO_REUSEADDR
 716                 err_num=get_last_socket_error();
 717                 if ((bind_mode == BIO_BIND_REUSEADDR_IF_UNUSED) &&
 718                         (err_num == EADDRINUSE))
 719                         {
 720                         client = server;
 721                         if (h == NULL || strcmp(h,"*") == 0)
 722                                 {
 723 #ifdef AF_INET6
 724                                 if (client.sa_family == AF_INET6)
 725                                         {
 726                                         struct sockaddr_in6 *sin6 =
 727                                                 (struct sockaddr_in6 *)&client;
 728                                         memset(&sin6->sin6_addr,0,sizeof(sin6->sin6_addr));
 729                                         sin6->sin6_addr.s6_addr[15]=1;
 730                                         }
 731                                 else
 732 #endif
 733                                 if (client.sa_family == AF_INET)
 734                                         {
 735                                         struct sockaddr_in *sin6 =
 736                                                 (struct sockaddr_in *)&client;
 737                                         sin6->sin_addr.s_addr=htonl(0x7F000001);
 738                                         }
 739                                 else    goto err;
 740                                 }
 741                         cs=socket(client.sa_family,SOCK_STREAM,SOCKET_PROTOCOL);
 742                         if (cs != INVALID_SOCKET)
 743                                 {
 744                                 int ii;
 745                                 ii=connect(cs,(struct sockaddr *)&client,
 746                                         sizeof(client));
 747                                 closesocket(cs);
 748                                 if (ii == INVALID_SOCKET)
 749                                         {
 750                                         bind_mode=BIO_BIND_REUSEADDR;
 751                                         closesocket(s);
 752                                         goto again;
 753                                         }
 754                                 /* else error */
 755                                 }
 756                         /* else error */
 757                         }
 758 #endif
 759                 SYSerr(SYS_F_BIND,err_num);
 760                 ERR_add_error_data(3,"port='",host,"'");
 761                 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET,BIO_R_UNABLE_TO_BIND_SOCKET);
 762                 goto err;
 763                 }
 764         if (listen(s,MAX_LISTEN) == -1)
 765                 {
 766                 SYSerr(SYS_F_BIND,get_last_socket_error());
 767                 ERR_add_error_data(3,"port='",host,"'");
 768                 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET,BIO_R_UNABLE_TO_LISTEN_SOCKET);
 769                 goto err;
 770                 }
 771         ret=1;
 772 err:
 773         if (str != NULL) OPENSSL_free(str);
 774         if ((ret == 0) && (s != INVALID_SOCKET))
 775                 {
 776                 closesocket(s);
 777                 s= INVALID_SOCKET;
 778                 }
 779         return(s);
 780         }
 781
 782 int BIO_accept(int sock, char **addr)
 783         {
 784         int ret=INVALID_SOCKET;
 785         struct sockaddr from;
 786         struct sockaddr_in *sa_in;
 787         unsigned long l;
 788         unsigned short port;
 789         int len;
 790         char *p;
 791
 792         memset(&from,0,sizeof(from));
 793         len=sizeof(from);
 794         /* Note: under VMS with SOCKETSHR the fourth parameter is currently
 795          * of type (int *) whereas under other systems it is (void *) if
 796          * you don't have a cast it will choke the compiler: if you do
 797          * have a cast then you can either go for (int *) or (void *).
 798          */
 799         ret=accept(sock,&from,(void *)&len);
 800         if (ret == INVALID_SOCKET)
 801                 {
 802                 if(BIO_sock_should_retry(ret)) return -2;
 803                 SYSerr(SYS_F_ACCEPT,get_last_socket_error());
 804                 BIOerr(BIO_F_BIO_ACCEPT,BIO_R_ACCEPT_ERROR);
 805                 goto end;
 806                 }
 807
 808         if (addr == NULL) goto end;
 809
 810 #ifdef EAI_FAMILY
 811 # if defined(OPENSSL_SYS_VMS) || defined(OPENSSL_SYS_BEOS_BONE)
 812 #  define SOCKLEN_T size_t
 813 # else
 814 #  define SOCKLEN_T socklen_t
 815 #endif
 816         do {
 817         char   h[NI_MAXHOST],s[NI_MAXSERV];
 818         size_t nl;
 819         static union {  void *p;
 820                         int (*f)(const struct sockaddr *,SOCKLEN_T,
 821                                  char *,size_t,char *,size_t,int);
 822                         } p_getnameinfo = {NULL};
 823
 824         if (p_getnameinfo.p==NULL)
 825                 {
 826                 if ((p_getnameinfo.p=DSO_global_lookup("getnameinfo"))==NULL)
 827                         p_getnameinfo.p=(void*)-1;
 828                 }
 829         if (p_getnameinfo.p==(void *)-1) break;
 830
 831         if ((*p_getnameinfo.f)(&from,sizeof(from),h,sizeof(h),s,sizeof(s),
 832             NI_NUMERICHOST|NI_NUMERICSERV)) break;
 833         nl = strlen(h)+strlen(s)+2; if (len<24) len=24;
 834         p = *addr;
 835         if (p)  { *p = '\0'; p = OPENSSL_realloc(p,nl); }
 836         else    { p = OPENSSL_malloc(nl);               }
 837         if (p==NULL)
 838                 {
 839                 BIOerr(BIO_F_BIO_ACCEPT,ERR_R_MALLOC_FAILURE);
 840                 goto end;
 841                 }
 842         *addr = p;
 843         BIO_snprintf(*addr,nl,"%s:%s",h,s);
 844         goto end;
 845         } while(0);
 846 #endif
 847         if (from.sa_family != AF_INET) goto end;
 848         sa_in = (struct sockaddr_in *)&from;
 849         l=ntohl(sa_in->sin_addr.s_addr);
 850         port=ntohs(sa_in->sin_port);
 851         if (*addr == NULL)
 852                 {
 853                 if ((p=OPENSSL_malloc(24)) == NULL)
 854                         {
 855                         BIOerr(BIO_F_BIO_ACCEPT,ERR_R_MALLOC_FAILURE);
 856                         goto end;
 857                         }
 858                 *addr=p;
 859                 }
 860         BIO_snprintf(*addr,24,"%d.%d.%d.%d:%d",
 861                      (unsigned char)(l>>24L)&0xff,
 862                      (unsigned char)(l>>16L)&0xff,
 863                      (unsigned char)(l>> 8L)&0xff,
 864                      (unsigned char)(l     )&0xff,
 865                      port);
 866 end:
 867         return(ret);
 868         }
 869
 870 int BIO_set_tcp_ndelay(int s, int on)
 871         {
 872         int ret=0;
 873 #if defined(TCP_NODELAY) && (defined(IPPROTO_TCP) || defined(SOL_TCP))
 874         int opt;
 875
 876 #ifdef SOL_TCP
 877         opt=SOL_TCP;
 878 #else
 879 #ifdef IPPROTO_TCP
 880         opt=IPPROTO_TCP;
 881 #endif
 882 #endif
 883
 884         ret=setsockopt(s,opt,TCP_NODELAY,(char *)&on,sizeof(on));
 885 #endif
 886         return(ret == 0);
 887         }
 888 #endif
 889
 890 int BIO_socket_nbio(int s, int mode)
 891         {
 892         int ret= -1;
 893         int l;
 894
 895         l=mode;
 896 #ifdef FIONBIO
 897         ret=BIO_socket_ioctl(s,FIONBIO,&l);
 898 #endif
 899         return(ret == 0);
 900         }