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 #if defined(NETWARE_CLIB)
  68 #include <sys/ioctl.h>
  69 NETDB_DEFINE_CONTEXT
  70 #endif
  71 #endif
  72
  73 #ifndef OPENSSL_NO_SOCK
  74
  75 #include <openssl/dso.h>
  76
  77 #define SOCKET_PROTOCOL IPPROTO_TCP
  78
  79 #ifdef SO_MAXCONN
  80 #define MAX_LISTEN  SO_MAXCONN
  81 #elif defined(SOMAXCONN)
  82 #define MAX_LISTEN  SOMAXCONN
  83 #else
  84 #define MAX_LISTEN  32
  85 #endif
  86
  87 #if defined(OPENSSL_SYS_WINDOWS) || (defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK))
  88 static int wsa_init_done=0;
  89 #endif
  90
  91 #if 0
  92 static unsigned long BIO_ghbn_hits=0L;
  93 static unsigned long BIO_ghbn_miss=0L;
  94
  95 #define GHBN_NUM        4
  96 static struct ghbn_cache_st
  97         {
  98         char name[129];
  99         struct hostent *ent;
 100         unsigned long order;
 101         } ghbn_cache[GHBN_NUM];
 102 #endif
 103
 104 static int get_ip(const char *str,unsigned char *ip);
 105 #if 0
 106 static void ghbn_free(struct hostent *a);
 107 static struct hostent *ghbn_dup(struct hostent *a);
 108 #endif
 109 int BIO_get_host_ip(const char *str, unsigned char *ip)
 110         {
 111         int i;
 112         int err = 1;
 113         int locked = 0;
 114         struct hostent *he;
 115
 116         i=get_ip(str,ip);
 117         if (i < 0)
 118                 {
 119                 BIOerr(BIO_F_BIO_GET_HOST_IP,BIO_R_INVALID_IP_ADDRESS);
 120                 goto err;
 121                 }
 122
 123         /* At this point, we have something that is most probably correct
 124            in some way, so let's init the socket. */
 125         if (BIO_sock_init() != 1)
 126                 return 0; /* don't generate another error code here */
 127
 128         /* If the string actually contained an IP address, we need not do
 129            anything more */
 130         if (i > 0) return(1);
 131
 132         /* do a gethostbyname */
 133         CRYPTO_w_lock(CRYPTO_LOCK_GETHOSTBYNAME);
 134         locked = 1;
 135         he=BIO_gethostbyname(str);
 136         if (he == NULL)
 137                 {
 138                 BIOerr(BIO_F_BIO_GET_HOST_IP,BIO_R_BAD_HOSTNAME_LOOKUP);
 139                 goto err;
 140                 }
 141
 142         /* cast to short because of win16 winsock definition */
 143         if ((short)he->h_addrtype != AF_INET)
 144                 {
 145                 BIOerr(BIO_F_BIO_GET_HOST_IP,BIO_R_GETHOSTBYNAME_ADDR_IS_NOT_AF_INET);
 146                 goto err;
 147                 }
 148         for (i=0; i<4; i++)
 149                 ip[i]=he->h_addr_list[0][i];
 150         err = 0;
 151
 152  err:
 153         if (locked)
 154                 CRYPTO_w_unlock(CRYPTO_LOCK_GETHOSTBYNAME);
 155         if (err)
 156                 {
 157                 ERR_add_error_data(2,"host=",str);
 158                 return 0;
 159                 }
 160         else
 161                 return 1;
 162         }
 163
 164 int BIO_get_port(const char *str, unsigned short *port_ptr)
 165         {
 166         int i;
 167         struct servent *s;
 168
 169         if (str == NULL)
 170                 {
 171                 BIOerr(BIO_F_BIO_GET_PORT,BIO_R_NO_PORT_DEFINED);
 172                 return(0);
 173                 }
 174         i=atoi(str);
 175         if (i != 0)
 176                 *port_ptr=(unsigned short)i;
 177         else
 178                 {
 179                 CRYPTO_w_lock(CRYPTO_LOCK_GETSERVBYNAME);
 180                 /* Note: under VMS with SOCKETSHR, it seems like the first
 181                  * parameter is 'char *', instead of 'const char *'
 182                  */
 183 #ifndef CONST_STRICT
 184                 s=getservbyname((char *)str,"tcp");
 185 #else
 186                 s=getservbyname(str,"tcp");
 187 #endif
 188                 if(s != NULL)
 189                         *port_ptr=ntohs((unsigned short)s->s_port);
 190                 CRYPTO_w_unlock(CRYPTO_LOCK_GETSERVBYNAME);
 191                 if(s == NULL)
 192                         {
 193                         if (strcmp(str,"http") == 0)
 194                                 *port_ptr=80;
 195                         else if (strcmp(str,"telnet") == 0)
 196                                 *port_ptr=23;
 197                         else if (strcmp(str,"socks") == 0)
 198                                 *port_ptr=1080;
 199                         else if (strcmp(str,"https") == 0)
 200                                 *port_ptr=443;
 201                         else if (strcmp(str,"ssl") == 0)
 202                                 *port_ptr=443;
 203                         else if (strcmp(str,"ftp") == 0)
 204                                 *port_ptr=21;
 205                         else if (strcmp(str,"gopher") == 0)
 206                                 *port_ptr=70;
 207 #if 0
 208                         else if (strcmp(str,"wais") == 0)
 209                                 *port_ptr=21;
 210 #endif
 211                         else
 212                                 {
 213                                 SYSerr(SYS_F_GETSERVBYNAME,get_last_socket_error());
 214                                 ERR_add_error_data(3,"service='",str,"'");
 215                                 return(0);
 216                                 }
 217                         }
 218                 }
 219         return(1);
 220         }
 221
 222 int BIO_sock_error(int sock)
 223         {
 224         int j,i;
 225         int size;
 226
 227 #if defined(OPENSSL_SYS_BEOS_R5)
 228         return 0;
 229 #endif
 230
 231         size=sizeof(int);
 232         /* Note: under Windows the third parameter is of type (char *)
 233          * whereas under other systems it is (void *) if you don't have
 234          * a cast it will choke the compiler: if you do have a cast then
 235          * you can either go for (char *) or (void *).
 236          */
 237         i=getsockopt(sock,SOL_SOCKET,SO_ERROR,(void *)&j,(void *)&size);
 238         if (i < 0)
 239                 return(1);
 240         else
 241                 return(j);
 242         }
 243
 244 #if 0
 245 long BIO_ghbn_ctrl(int cmd, int iarg, char *parg)
 246         {
 247         int i;
 248         char **p;
 249
 250         switch (cmd)
 251                 {
 252         case BIO_GHBN_CTRL_HITS:
 253                 return(BIO_ghbn_hits);
 254                 /* break; */
 255         case BIO_GHBN_CTRL_MISSES:
 256                 return(BIO_ghbn_miss);
 257                 /* break; */
 258         case BIO_GHBN_CTRL_CACHE_SIZE:
 259                 return(GHBN_NUM);
 260                 /* break; */
 261         case BIO_GHBN_CTRL_GET_ENTRY:
 262                 if ((iarg >= 0) && (iarg <GHBN_NUM) &&
 263                         (ghbn_cache[iarg].order > 0))
 264                         {
 265                         p=(char **)parg;
 266                         if (p == NULL) return(0);
 267                         *p=ghbn_cache[iarg].name;
 268                         ghbn_cache[iarg].name[128]='\0';
 269                         return(1);
 270                         }
 271                 return(0);
 272                 /* break; */
 273         case BIO_GHBN_CTRL_FLUSH:
 274                 for (i=0; i<GHBN_NUM; i++)
 275                         ghbn_cache[i].order=0;
 276                 break;
 277         default:
 278                 return(0);
 279                 }
 280         return(1);
 281         }
 282 #endif
 283
 284 #if 0
 285 static struct hostent *ghbn_dup(struct hostent *a)
 286         {
 287         struct hostent *ret;
 288         int i,j;
 289
 290         MemCheck_off();
 291         ret=(struct hostent *)OPENSSL_malloc(sizeof(struct hostent));
 292         if (ret == NULL) return(NULL);
 293         memset(ret,0,sizeof(struct hostent));
 294
 295         for (i=0; a->h_aliases[i] != NULL; i++)
 296                 ;
 297         i++;
 298         ret->h_aliases = (char **)OPENSSL_malloc(i*sizeof(char *));
 299         if (ret->h_aliases == NULL)
 300                 goto err;
 301         memset(ret->h_aliases, 0, i*sizeof(char *));
 302
 303         for (i=0; a->h_addr_list[i] != NULL; i++)
 304                 ;
 305         i++;
 306         ret->h_addr_list=(char **)OPENSSL_malloc(i*sizeof(char *));
 307         if (ret->h_addr_list == NULL)
 308                 goto err;
 309         memset(ret->h_addr_list, 0, i*sizeof(char *));
 310
 311         j=strlen(a->h_name)+1;
 312         if ((ret->h_name=OPENSSL_malloc(j)) == NULL) goto err;
 313         memcpy((char *)ret->h_name,a->h_name,j);
 314         for (i=0; a->h_aliases[i] != NULL; i++)
 315                 {
 316                 j=strlen(a->h_aliases[i])+1;
 317                 if ((ret->h_aliases[i]=OPENSSL_malloc(j)) == NULL) goto err;
 318                 memcpy(ret->h_aliases[i],a->h_aliases[i],j);
 319                 }
 320         ret->h_length=a->h_length;
 321         ret->h_addrtype=a->h_addrtype;
 322         for (i=0; a->h_addr_list[i] != NULL; i++)
 323                 {
 324                 if ((ret->h_addr_list[i]=OPENSSL_malloc(a->h_length)) == NULL)
 325                         goto err;
 326                 memcpy(ret->h_addr_list[i],a->h_addr_list[i],a->h_length);
 327                 }
 328         if (0)
 329                 {
 330 err:
 331                 if (ret != NULL)
 332                         ghbn_free(ret);
 333                 ret=NULL;
 334                 }
 335         MemCheck_on();
 336         return(ret);
 337         }
 338
 339 static void ghbn_free(struct hostent *a)
 340         {
 341         int i;
 342
 343         if(a == NULL)
 344             return;
 345
 346         if (a->h_aliases != NULL)
 347                 {
 348                 for (i=0; a->h_aliases[i] != NULL; i++)
 349                         OPENSSL_free(a->h_aliases[i]);
 350                 OPENSSL_free(a->h_aliases);
 351                 }
 352         if (a->h_addr_list != NULL)
 353                 {
 354                 for (i=0; a->h_addr_list[i] != NULL; i++)
 355                         OPENSSL_free(a->h_addr_list[i]);
 356                 OPENSSL_free(a->h_addr_list);
 357                 }
 358         if (a->h_name != NULL) OPENSSL_free(a->h_name);
 359         OPENSSL_free(a);
 360         }
 361
 362 #endif
 363
 364 struct hostent *BIO_gethostbyname(const char *name)
 365         {
 366 #if 1
 367         /* Caching gethostbyname() results forever is wrong,
 368          * so we have to let the true gethostbyname() worry about this */
 369 #if (defined(NETWARE_BSDSOCK) && !defined(__NOVELL_LIBC__))
 370         return gethostbyname((char*)name);
 371 #else
 372         return gethostbyname(name);
 373 #endif
 374 #else
 375         struct hostent *ret;
 376         int i,lowi=0,j;
 377         unsigned long low= (unsigned long)-1;
 378
 379
 380 #  if 0
 381         /* It doesn't make sense to use locking here: The function interface
 382          * is not thread-safe, because threads can never be sure when
 383          * some other thread destroys the data they were given a pointer to.
 384          */
 385         CRYPTO_w_lock(CRYPTO_LOCK_GETHOSTBYNAME);
 386 #  endif
 387         j=strlen(name);
 388         if (j < 128)
 389                 {
 390                 for (i=0; i<GHBN_NUM; i++)
 391                         {
 392                         if (low > ghbn_cache[i].order)
 393                                 {
 394                                 low=ghbn_cache[i].order;
 395                                 lowi=i;
 396                                 }
 397                         if (ghbn_cache[i].order > 0)
 398                                 {
 399                                 if (strncmp(name,ghbn_cache[i].name,128) == 0)
 400                                         break;
 401                                 }
 402                         }
 403                 }
 404         else
 405                 i=GHBN_NUM;
 406
 407         if (i == GHBN_NUM) /* no hit*/
 408                 {
 409                 BIO_ghbn_miss++;
 410                 /* Note: under VMS with SOCKETSHR, it seems like the first
 411                  * parameter is 'char *', instead of 'const char *'
 412                  */
 413 #  ifndef CONST_STRICT
 414                 ret=gethostbyname((char *)name);
 415 #  else
 416                 ret=gethostbyname(name);
 417 #  endif
 418
 419                 if (ret == NULL)
 420                         goto end;
 421                 if (j > 128) /* too big to cache */
 422                         {
 423 #  if 0
 424                         /* If we were trying to make this function thread-safe (which
 425                          * is bound to fail), we'd have to give up in this case
 426                          * (or allocate more memory). */
 427                         ret = NULL;
 428 #  endif
 429                         goto end;
 430                         }
 431
 432                 /* else add to cache */
 433                 if (ghbn_cache[lowi].ent != NULL)
 434                         ghbn_free(ghbn_cache[lowi].ent); /* XXX not thread-safe */
 435                 ghbn_cache[lowi].name[0] = '\0';
 436
 437                 if((ret=ghbn_cache[lowi].ent=ghbn_dup(ret)) == NULL)
 438                         {
 439                         BIOerr(BIO_F_BIO_GETHOSTBYNAME,ERR_R_MALLOC_FAILURE);
 440                         goto end;
 441                         }
 442                 strncpy(ghbn_cache[lowi].name,name,128);
 443                 ghbn_cache[lowi].order=BIO_ghbn_miss+BIO_ghbn_hits;
 444                 }
 445         else
 446                 {
 447                 BIO_ghbn_hits++;
 448                 ret= ghbn_cache[i].ent;
 449                 ghbn_cache[i].order=BIO_ghbn_miss+BIO_ghbn_hits;
 450                 }
 451 end:
 452 #  if 0
 453         CRYPTO_w_unlock(CRYPTO_LOCK_GETHOSTBYNAME);
 454 #  endif
 455         return(ret);
 456 #endif
 457         }
 458
 459
 460 int BIO_sock_init(void)
 461         {
 462 #ifdef OPENSSL_SYS_WINDOWS
 463         static struct WSAData wsa_state;
 464
 465         if (!wsa_init_done)
 466                 {
 467                 int err;
 468
 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         wsa_init_done=1;
 500         wVerReq = MAKEWORD( 2, 0 );
 501         err = WSAStartup(wVerReq,&wsaData);
 502         if (err != 0)
 503         {
 504             SYSerr(SYS_F_WSASTARTUP,err);
 505             BIOerr(BIO_F_BIO_SOCK_INIT,BIO_R_WSASTARTUP);
 506             return(-1);
 507                         }
 508                 }
 509 #endif
 510
 511         return(1);
 512         }
 513
 514 void BIO_sock_cleanup(void)
 515         {
 516 #ifdef OPENSSL_SYS_WINDOWS
 517         if (wsa_init_done)
 518                 {
 519                 wsa_init_done=0;
 520 #if 0           /* this call is claimed to be non-present in Winsock2 */
 521                 WSACancelBlockingCall();
 522 #endif
 523                 WSACleanup();
 524                 }
 525 #elif defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK)
 526    if (wsa_init_done)
 527         {
 528         wsa_init_done=0;
 529         WSACleanup();
 530                 }
 531 #endif
 532         }
 533
 534 #if !defined(OPENSSL_SYS_VMS) || __VMS_VER >= 70000000
 535
 536 int BIO_socket_ioctl(int fd, long type, void *arg)
 537         {
 538         int i;
 539
 540 #ifdef __DJGPP__
 541         i=ioctlsocket(fd,type,(char *)arg);
 542 #else
 543         i=ioctlsocket(fd,type,arg);
 544 #endif /* __DJGPP__ */
 545         if (i < 0)
 546                 SYSerr(SYS_F_IOCTLSOCKET,get_last_socket_error());
 547         return(i);
 548         }
 549 #endif /* __VMS_VER */
 550
 551 /* The reason I have implemented this instead of using sscanf is because
 552  * Visual C 1.52c gives an unresolved external when linking a DLL :-( */
 553 static int get_ip(const char *str, unsigned char ip[4])
 554         {
 555         unsigned int tmp[4];
 556         int num=0,c,ok=0;
 557
 558         tmp[0]=tmp[1]=tmp[2]=tmp[3]=0;
 559
 560         for (;;)
 561                 {
 562                 c= *(str++);
 563                 if ((c >= '0') && (c <= '9'))
 564                         {
 565                         ok=1;
 566                         tmp[num]=tmp[num]*10+c-'0';
 567                         if (tmp[num] > 255) return(0);
 568                         }
 569                 else if (c == '.')
 570                         {
 571                         if (!ok) return(-1);
 572                         if (num == 3) return(0);
 573                         num++;
 574                         ok=0;
 575                         }
 576                 else if (c == '\0' && (num == 3) && ok)
 577                         break;
 578                 else
 579                         return(0);
 580                 }
 581         ip[0]=tmp[0];
 582         ip[1]=tmp[1];
 583         ip[2]=tmp[2];
 584         ip[3]=tmp[3];
 585         return(1);
 586         }
 587
 588 int BIO_get_accept_socket(char *host, int bind_mode)
 589         {
 590         int ret=0;
 591         union {
 592                 struct sockaddr sa;
 593                 struct sockaddr_in sa_in;
 594 #if OPENSSL_USE_IPV6
 595                 struct sockaddr_in6 sa_in6;
 596 #endif
 597         } server,client;
 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 #if OPENSSL_USE_IPV6
 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
 669         memcpy(&server, res->ai_addr,
 670                 res->ai_addrlen<=sizeof(server)?res->ai_addrlen:sizeof(server));
 671
 672         (*p_freeaddrinfo.f)(res);
 673         goto again;
 674         } while (0);
 675 #endif
 676
 677         if (!BIO_get_port(p,&port)) goto err;
 678
 679         memset((char *)&server,0,sizeof(server));
 680         server.sa_in.sin_family=AF_INET;
 681         server.sa_in.sin_port=htons(port);
 682
 683         if (h == NULL || strcmp(h,"*") == 0)
 684                 server.sa_in.sin_addr.s_addr=INADDR_ANY;
 685         else
 686                 {
 687                 if (!BIO_get_host_ip(h,&(ip[0]))) goto err;
 688                 l=(unsigned long)
 689                         ((unsigned long)ip[0]<<24L)|
 690                         ((unsigned long)ip[1]<<16L)|
 691                         ((unsigned long)ip[2]<< 8L)|
 692                         ((unsigned long)ip[3]);
 693                 server.sa_in.sin_addr.s_addr=htonl(l);
 694                 }
 695
 696 again:
 697         s=socket(server.sa.sa_family,SOCK_STREAM,SOCKET_PROTOCOL);
 698         if (s == INVALID_SOCKET)
 699                 {
 700                 SYSerr(SYS_F_SOCKET,get_last_socket_error());
 701                 ERR_add_error_data(3,"port='",host,"'");
 702                 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET,BIO_R_UNABLE_TO_CREATE_SOCKET);
 703                 goto err;
 704                 }
 705
 706 #ifdef SO_REUSEADDR
 707         if (bind_mode == BIO_BIND_REUSEADDR)
 708                 {
 709                 int i=1;
 710
 711                 ret=setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&i,sizeof(i));
 712                 bind_mode=BIO_BIND_NORMAL;
 713                 }
 714 #endif
 715         if (bind(s,&server.sa,sizeof(server)) == -1)
 716                 {
 717 #ifdef SO_REUSEADDR
 718                 err_num=get_last_socket_error();
 719                 if ((bind_mode == BIO_BIND_REUSEADDR_IF_UNUSED) &&
 720                         (err_num == EADDRINUSE))
 721                         {
 722                         client = server;
 723                         if (h == NULL || strcmp(h,"*") == 0)
 724                                 {
 725 #if OPENSSL_USE_IPV6
 726                                 if (client.sa.sa_family == AF_INET6)
 727                                         {
 728                                         memset(&client.sa_in6.sin6_addr,0,sizeof(client.sa_in6.sin6_addr));
 729                                         client.sa_in6.sin6_addr.s6_addr[15]=1;
 730                                         }
 731                                 else
 732 #endif
 733                                 if (client.sa.sa_family == AF_INET)
 734                                         {
 735                                         client.sa_in.sin_addr.s_addr=htonl(0x7F000001);
 736                                         }
 737                                 else    goto err;
 738                                 }
 739                         cs=socket(client.sa.sa_family,SOCK_STREAM,SOCKET_PROTOCOL);
 740                         if (cs != INVALID_SOCKET)
 741                                 {
 742                                 int ii;
 743                                 ii=connect(cs,&client.sa,sizeof(client));
 744                                 closesocket(cs);
 745                                 if (ii == INVALID_SOCKET)
 746                                         {
 747                                         bind_mode=BIO_BIND_REUSEADDR;
 748                                         closesocket(s);
 749                                         goto again;
 750                                         }
 751                                 /* else error */
 752                                 }
 753                         /* else error */
 754                         }
 755 #endif
 756                 SYSerr(SYS_F_BIND,err_num);
 757                 ERR_add_error_data(3,"port='",host,"'");
 758                 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET,BIO_R_UNABLE_TO_BIND_SOCKET);
 759                 goto err;
 760                 }
 761         if (listen(s,MAX_LISTEN) == -1)
 762                 {
 763                 SYSerr(SYS_F_BIND,get_last_socket_error());
 764                 ERR_add_error_data(3,"port='",host,"'");
 765                 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET,BIO_R_UNABLE_TO_LISTEN_SOCKET);
 766                 goto err;
 767                 }
 768         ret=1;
 769 err:
 770         if (str != NULL) OPENSSL_free(str);
 771         if ((ret == 0) && (s != INVALID_SOCKET))
 772                 {
 773                 closesocket(s);
 774                 s= INVALID_SOCKET;
 775                 }
 776         return(s);
 777         }
 778
 779 int BIO_accept(int sock, char **addr)
 780         {
 781         int ret=INVALID_SOCKET;
 782         unsigned long l;
 783         unsigned short port;
 784         char *p;
 785
 786         struct {
 787         /*
 788          * As for following union. Trouble is that there are platforms
 789          * that have socklen_t and there are platforms that don't, on
 790          * some platforms socklen_t is int and on some size_t. So what
 791          * one can do? One can cook #ifdef spaghetti, which is nothing
 792          * but masochistic. Or one can do union between int and size_t.
 793          * One naturally does it primarily for 64-bit platforms where
 794          * sizeof(int) != sizeof(size_t). But would it work? Note that
 795          * if size_t member is initialized to 0, then later int member
 796          * assignment naturally does the job on little-endian platforms
 797          * regardless accept's expectations! What about big-endians?
 798          * If accept expects int*, then it works, and if size_t*, then
 799          * length value would appear as unreasonably large. But this
 800          * won't prevent it from filling in the address structure. The
 801          * trouble of course would be if accept returns more data than
 802          * actual buffer can accomodate and overwrite stack... That's
 803          * where early OPENSSL_assert comes into picture. Besides, the
 804          * only 64-bit big-endian platform found so far that expects
 805          * size_t* is HP-UX, where stack grows towards higher address.
 806          * <appro>
 807          */
 808         union { size_t s; int i; } len;
 809         union {
 810                 struct sockaddr sa;
 811                 struct sockaddr_in sa_in;
 812 #if OPENSSL_USE_IPV6
 813                 struct sockaddr_in6 sa_in6;
 814 #endif
 815                 } from;
 816         } sa;
 817
 818         sa.len.s=0;
 819         sa.len.i=sizeof(sa.from);
 820         memset(&sa.from,0,sizeof(sa.from));
 821         ret=accept(sock,&sa.from.sa,(void *)&sa.len);
 822         if (sizeof(sa.len.i)!=sizeof(sa.len.s) && sa.len.i==0)
 823                 {
 824                 OPENSSL_assert(sa.len.s<=sizeof(sa.from));
 825                 sa.len.i = (unsigned int)sa.len.s;
 826                 }
 827         if (ret == INVALID_SOCKET)
 828                 {
 829                 if(BIO_sock_should_retry(ret)) return -2;
 830                 SYSerr(SYS_F_ACCEPT,get_last_socket_error());
 831                 BIOerr(BIO_F_BIO_ACCEPT,BIO_R_ACCEPT_ERROR);
 832                 goto end;
 833                 }
 834
 835         if (addr == NULL) goto end;
 836
 837 #ifdef EAI_FAMILY
 838         do {
 839         char   h[NI_MAXHOST],s[NI_MAXSERV];
 840         size_t nl;
 841         static union {  void *p;
 842                         int (*f)(const struct sockaddr *,size_t/*socklen_t*/,
 843                                  char *,size_t,char *,size_t,int);
 844                         } p_getnameinfo = {NULL};
 845                         /* 2nd argument to getnameinfo is specified to
 846                          * be socklen_t. Unfortunately there is a number
 847                          * of environments where socklen_t is not defined.
 848                          * As it's passed by value, it's safe to pass it
 849                          * as size_t... <appro> */
 850
 851         if (p_getnameinfo.p==NULL)
 852                 {
 853                 if ((p_getnameinfo.p=DSO_global_lookup("getnameinfo"))==NULL)
 854                         p_getnameinfo.p=(void*)-1;
 855                 }
 856         if (p_getnameinfo.p==(void *)-1) break;
 857
 858         if ((*p_getnameinfo.f)(&sa.from.sa,sa.len.i,h,sizeof(h),s,sizeof(s),
 859             NI_NUMERICHOST|NI_NUMERICSERV)) break;
 860         nl = strlen(h)+strlen(s)+2;
 861         p = *addr;
 862         if (p)  { *p = '\0'; p = OPENSSL_realloc(p,nl); }
 863         else    { p = OPENSSL_malloc(nl);               }
 864         if (p==NULL)
 865                 {
 866                 BIOerr(BIO_F_BIO_ACCEPT,ERR_R_MALLOC_FAILURE);
 867                 goto end;
 868                 }
 869         *addr = p;
 870         BIO_snprintf(*addr,nl,"%s:%s",h,s);
 871         goto end;
 872         } while(0);
 873 #endif
 874         if (sa.from.sa.sa_family != AF_INET) goto end;
 875         l=ntohl(sa.from.sa_in.sin_addr.s_addr);
 876         port=ntohs(sa.from.sa_in.sin_port);
 877         if (*addr == NULL)
 878                 {
 879                 if ((p=OPENSSL_malloc(24)) == NULL)
 880                         {
 881                         BIOerr(BIO_F_BIO_ACCEPT,ERR_R_MALLOC_FAILURE);
 882                         goto end;
 883                         }
 884                 *addr=p;
 885                 }
 886         BIO_snprintf(*addr,24,"%d.%d.%d.%d:%d",
 887                      (unsigned char)(l>>24L)&0xff,
 888                      (unsigned char)(l>>16L)&0xff,
 889                      (unsigned char)(l>> 8L)&0xff,
 890                      (unsigned char)(l     )&0xff,
 891                      port);
 892 end:
 893         return(ret);
 894         }
 895
 896 int BIO_set_tcp_ndelay(int s, int on)
 897         {
 898         int ret=0;
 899 #if defined(TCP_NODELAY) && (defined(IPPROTO_TCP) || defined(SOL_TCP))
 900         int opt;
 901
 902 #ifdef SOL_TCP
 903         opt=SOL_TCP;
 904 #else
 905 #ifdef IPPROTO_TCP
 906         opt=IPPROTO_TCP;
 907 #endif
 908 #endif
 909
 910         ret=setsockopt(s,opt,TCP_NODELAY,(char *)&on,sizeof(on));
 911 #endif
 912         return(ret == 0);
 913         }
 914 #endif
 915
 916 int BIO_socket_nbio(int s, int mode)
 917         {
 918         int ret= -1;
 919         int l;
 920
 921         l=mode;
 922 #ifdef FIONBIO
 923         ret=BIO_socket_ioctl(s,FIONBIO,&l);
 924 #endif
 925         return(ret == 0);
 926         }