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 defined(OPENSSL_SYS_BEOS_BONE)
  92 /* BONE's IP6 support is incomplete */
  93 #undef AF_INET6
  94 #endif
  95
  96 #if 0
  97 static unsigned long BIO_ghbn_hits=0L;
  98 static unsigned long BIO_ghbn_miss=0L;
  99
 100 #define GHBN_NUM        4
 101 static struct ghbn_cache_st
 102         {
 103         char name[129];
 104         struct hostent *ent;
 105         unsigned long order;
 106         } ghbn_cache[GHBN_NUM];
 107 #endif
 108
 109 static int get_ip(const char *str,unsigned char *ip);
 110 #if 0
 111 static void ghbn_free(struct hostent *a);
 112 static struct hostent *ghbn_dup(struct hostent *a);
 113 #endif
 114 int BIO_get_host_ip(const char *str, unsigned char *ip)
 115         {
 116         int i;
 117         int err = 1;
 118         int locked = 0;
 119         struct hostent *he;
 120
 121         i=get_ip(str,ip);
 122         if (i < 0)
 123                 {
 124                 BIOerr(BIO_F_BIO_GET_HOST_IP,BIO_R_INVALID_IP_ADDRESS);
 125                 goto err;
 126                 }
 127
 128         /* At this point, we have something that is most probably correct
 129            in some way, so let's init the socket. */
 130         if (BIO_sock_init() != 1)
 131                 return 0; /* don't generate another error code here */
 132
 133         /* If the string actually contained an IP address, we need not do
 134            anything more */
 135         if (i > 0) return(1);
 136
 137         /* do a gethostbyname */
 138         CRYPTO_w_lock(CRYPTO_LOCK_GETHOSTBYNAME);
 139         locked = 1;
 140         he=BIO_gethostbyname(str);
 141         if (he == NULL)
 142                 {
 143                 BIOerr(BIO_F_BIO_GET_HOST_IP,BIO_R_BAD_HOSTNAME_LOOKUP);
 144                 goto err;
 145                 }
 146
 147         /* cast to short because of win16 winsock definition */
 148         if ((short)he->h_addrtype != AF_INET)
 149                 {
 150                 BIOerr(BIO_F_BIO_GET_HOST_IP,BIO_R_GETHOSTBYNAME_ADDR_IS_NOT_AF_INET);
 151                 goto err;
 152                 }
 153         for (i=0; i<4; i++)
 154                 ip[i]=he->h_addr_list[0][i];
 155         err = 0;
 156
 157  err:
 158         if (locked)
 159                 CRYPTO_w_unlock(CRYPTO_LOCK_GETHOSTBYNAME);
 160         if (err)
 161                 {
 162                 ERR_add_error_data(2,"host=",str);
 163                 return 0;
 164                 }
 165         else
 166                 return 1;
 167         }
 168
 169 int BIO_get_port(const char *str, unsigned short *port_ptr)
 170         {
 171         int i;
 172         struct servent *s;
 173
 174         if (str == NULL)
 175                 {
 176                 BIOerr(BIO_F_BIO_GET_PORT,BIO_R_NO_PORT_DEFINED);
 177                 return(0);
 178                 }
 179         i=atoi(str);
 180         if (i != 0)
 181                 *port_ptr=(unsigned short)i;
 182         else
 183                 {
 184                 CRYPTO_w_lock(CRYPTO_LOCK_GETSERVBYNAME);
 185                 /* Note: under VMS with SOCKETSHR, it seems like the first
 186                  * parameter is 'char *', instead of 'const char *'
 187                  */
 188 #ifndef CONST_STRICT
 189                 s=getservbyname((char *)str,"tcp");
 190 #else
 191                 s=getservbyname(str,"tcp");
 192 #endif
 193                 if(s != NULL)
 194                         *port_ptr=ntohs((unsigned short)s->s_port);
 195                 CRYPTO_w_unlock(CRYPTO_LOCK_GETSERVBYNAME);
 196                 if(s == NULL)
 197                         {
 198                         if (strcmp(str,"http") == 0)
 199                                 *port_ptr=80;
 200                         else if (strcmp(str,"telnet") == 0)
 201                                 *port_ptr=23;
 202                         else if (strcmp(str,"socks") == 0)
 203                                 *port_ptr=1080;
 204                         else if (strcmp(str,"https") == 0)
 205                                 *port_ptr=443;
 206                         else if (strcmp(str,"ssl") == 0)
 207                                 *port_ptr=443;
 208                         else if (strcmp(str,"ftp") == 0)
 209                                 *port_ptr=21;
 210                         else if (strcmp(str,"gopher") == 0)
 211                                 *port_ptr=70;
 212 #if 0
 213                         else if (strcmp(str,"wais") == 0)
 214                                 *port_ptr=21;
 215 #endif
 216                         else
 217                                 {
 218                                 SYSerr(SYS_F_GETSERVBYNAME,get_last_socket_error());
 219                                 ERR_add_error_data(3,"service='",str,"'");
 220                                 return(0);
 221                                 }
 222                         }
 223                 }
 224         return(1);
 225         }
 226
 227 int BIO_sock_error(int sock)
 228         {
 229         int j,i;
 230         int size;
 231
 232 #if defined(OPENSSL_SYS_BEOS_R5)
 233         return 0;
 234 #endif
 235
 236         size=sizeof(int);
 237         /* Note: under Windows the third parameter is of type (char *)
 238          * whereas under other systems it is (void *) if you don't have
 239          * a cast it will choke the compiler: if you do have a cast then
 240          * you can either go for (char *) or (void *).
 241          */
 242         i=getsockopt(sock,SOL_SOCKET,SO_ERROR,(void *)&j,(void *)&size);
 243         if (i < 0)
 244                 return(1);
 245         else
 246                 return(j);
 247         }
 248
 249 #if 0
 250 long BIO_ghbn_ctrl(int cmd, int iarg, char *parg)
 251         {
 252         int i;
 253         char **p;
 254
 255         switch (cmd)
 256                 {
 257         case BIO_GHBN_CTRL_HITS:
 258                 return(BIO_ghbn_hits);
 259                 /* break; */
 260         case BIO_GHBN_CTRL_MISSES:
 261                 return(BIO_ghbn_miss);
 262                 /* break; */
 263         case BIO_GHBN_CTRL_CACHE_SIZE:
 264                 return(GHBN_NUM);
 265                 /* break; */
 266         case BIO_GHBN_CTRL_GET_ENTRY:
 267                 if ((iarg >= 0) && (iarg <GHBN_NUM) &&
 268                         (ghbn_cache[iarg].order > 0))
 269                         {
 270                         p=(char **)parg;
 271                         if (p == NULL) return(0);
 272                         *p=ghbn_cache[iarg].name;
 273                         ghbn_cache[iarg].name[128]='\0';
 274                         return(1);
 275                         }
 276                 return(0);
 277                 /* break; */
 278         case BIO_GHBN_CTRL_FLUSH:
 279                 for (i=0; i<GHBN_NUM; i++)
 280                         ghbn_cache[i].order=0;
 281                 break;
 282         default:
 283                 return(0);
 284                 }
 285         return(1);
 286         }
 287 #endif
 288
 289 #if 0
 290 static struct hostent *ghbn_dup(struct hostent *a)
 291         {
 292         struct hostent *ret;
 293         int i,j;
 294
 295         MemCheck_off();
 296         ret=(struct hostent *)OPENSSL_malloc(sizeof(struct hostent));
 297         if (ret == NULL) return(NULL);
 298         memset(ret,0,sizeof(struct hostent));
 299
 300         for (i=0; a->h_aliases[i] != NULL; i++)
 301                 ;
 302         i++;
 303         ret->h_aliases = (char **)OPENSSL_malloc(i*sizeof(char *));
 304         if (ret->h_aliases == NULL)
 305                 goto err;
 306         memset(ret->h_aliases, 0, i*sizeof(char *));
 307
 308         for (i=0; a->h_addr_list[i] != NULL; i++)
 309                 ;
 310         i++;
 311         ret->h_addr_list=(char **)OPENSSL_malloc(i*sizeof(char *));
 312         if (ret->h_addr_list == NULL)
 313                 goto err;
 314         memset(ret->h_addr_list, 0, i*sizeof(char *));
 315
 316         j=strlen(a->h_name)+1;
 317         if ((ret->h_name=OPENSSL_malloc(j)) == NULL) goto err;
 318         memcpy((char *)ret->h_name,a->h_name,j);
 319         for (i=0; a->h_aliases[i] != NULL; i++)
 320                 {
 321                 j=strlen(a->h_aliases[i])+1;
 322                 if ((ret->h_aliases[i]=OPENSSL_malloc(j)) == NULL) goto err;
 323                 memcpy(ret->h_aliases[i],a->h_aliases[i],j);
 324                 }
 325         ret->h_length=a->h_length;
 326         ret->h_addrtype=a->h_addrtype;
 327         for (i=0; a->h_addr_list[i] != NULL; i++)
 328                 {
 329                 if ((ret->h_addr_list[i]=OPENSSL_malloc(a->h_length)) == NULL)
 330                         goto err;
 331                 memcpy(ret->h_addr_list[i],a->h_addr_list[i],a->h_length);
 332                 }
 333         if (0)
 334                 {
 335 err:
 336                 if (ret != NULL)
 337                         ghbn_free(ret);
 338                 ret=NULL;
 339                 }
 340         MemCheck_on();
 341         return(ret);
 342         }
 343
 344 static void ghbn_free(struct hostent *a)
 345         {
 346         int i;
 347
 348         if(a == NULL)
 349             return;
 350
 351         if (a->h_aliases != NULL)
 352                 {
 353                 for (i=0; a->h_aliases[i] != NULL; i++)
 354                         OPENSSL_free(a->h_aliases[i]);
 355                 OPENSSL_free(a->h_aliases);
 356                 }
 357         if (a->h_addr_list != NULL)
 358                 {
 359                 for (i=0; a->h_addr_list[i] != NULL; i++)
 360                         OPENSSL_free(a->h_addr_list[i]);
 361                 OPENSSL_free(a->h_addr_list);
 362                 }
 363         if (a->h_name != NULL) OPENSSL_free(a->h_name);
 364         OPENSSL_free(a);
 365         }
 366
 367 #endif
 368
 369 struct hostent *BIO_gethostbyname(const char *name)
 370         {
 371 #if 1
 372         /* Caching gethostbyname() results forever is wrong,
 373          * so we have to let the true gethostbyname() worry about this */
 374 #if (defined(NETWARE_BSDSOCK) && !defined(__NOVELL_LIBC__))
 375         return gethostbyname((char*)name);
 376 #else
 377         return gethostbyname(name);
 378 #endif
 379 #else
 380         struct hostent *ret;
 381         int i,lowi=0,j;
 382         unsigned long low= (unsigned long)-1;
 383
 384
 385 #  if 0
 386         /* It doesn't make sense to use locking here: The function interface
 387          * is not thread-safe, because threads can never be sure when
 388          * some other thread destroys the data they were given a pointer to.
 389          */
 390         CRYPTO_w_lock(CRYPTO_LOCK_GETHOSTBYNAME);
 391 #  endif
 392         j=strlen(name);
 393         if (j < 128)
 394                 {
 395                 for (i=0; i<GHBN_NUM; i++)
 396                         {
 397                         if (low > ghbn_cache[i].order)
 398                                 {
 399                                 low=ghbn_cache[i].order;
 400                                 lowi=i;
 401                                 }
 402                         if (ghbn_cache[i].order > 0)
 403                                 {
 404                                 if (strncmp(name,ghbn_cache[i].name,128) == 0)
 405                                         break;
 406                                 }
 407                         }
 408                 }
 409         else
 410                 i=GHBN_NUM;
 411
 412         if (i == GHBN_NUM) /* no hit*/
 413                 {
 414                 BIO_ghbn_miss++;
 415                 /* Note: under VMS with SOCKETSHR, it seems like the first
 416                  * parameter is 'char *', instead of 'const char *'
 417                  */
 418 #  ifndef CONST_STRICT
 419                 ret=gethostbyname((char *)name);
 420 #  else
 421                 ret=gethostbyname(name);
 422 #  endif
 423
 424                 if (ret == NULL)
 425                         goto end;
 426                 if (j > 128) /* too big to cache */
 427                         {
 428 #  if 0
 429                         /* If we were trying to make this function thread-safe (which
 430                          * is bound to fail), we'd have to give up in this case
 431                          * (or allocate more memory). */
 432                         ret = NULL;
 433 #  endif
 434                         goto end;
 435                         }
 436
 437                 /* else add to cache */
 438                 if (ghbn_cache[lowi].ent != NULL)
 439                         ghbn_free(ghbn_cache[lowi].ent); /* XXX not thread-safe */
 440                 ghbn_cache[lowi].name[0] = '\0';
 441
 442                 if((ret=ghbn_cache[lowi].ent=ghbn_dup(ret)) == NULL)
 443                         {
 444                         BIOerr(BIO_F_BIO_GETHOSTBYNAME,ERR_R_MALLOC_FAILURE);
 445                         goto end;
 446                         }
 447                 strncpy(ghbn_cache[lowi].name,name,128);
 448                 ghbn_cache[lowi].order=BIO_ghbn_miss+BIO_ghbn_hits;
 449                 }
 450         else
 451                 {
 452                 BIO_ghbn_hits++;
 453                 ret= ghbn_cache[i].ent;
 454                 ghbn_cache[i].order=BIO_ghbn_miss+BIO_ghbn_hits;
 455                 }
 456 end:
 457 #  if 0
 458         CRYPTO_w_unlock(CRYPTO_LOCK_GETHOSTBYNAME);
 459 #  endif
 460         return(ret);
 461 #endif
 462         }
 463
 464
 465 int BIO_sock_init(void)
 466         {
 467 #ifdef OPENSSL_SYS_WINDOWS
 468         static struct WSAData wsa_state;
 469
 470         if (!wsa_init_done)
 471                 {
 472                 int err;
 473
 474                 wsa_init_done=1;
 475                 memset(&wsa_state,0,sizeof(wsa_state));
 476                 /* Not making wsa_state available to the rest of the
 477                  * code is formally wrong. But the structures we use
 478                  * are [beleived to be] invariable among Winsock DLLs,
 479                  * while API availability is [expected to be] probed
 480                  * at run-time with DSO_global_lookup. */
 481                 if (WSAStartup(0x0202,&wsa_state)!=0)
 482                         {
 483                         err=WSAGetLastError();
 484                         SYSerr(SYS_F_WSASTARTUP,err);
 485                         BIOerr(BIO_F_BIO_SOCK_INIT,BIO_R_WSASTARTUP);
 486                         return(-1);
 487                         }
 488                 }
 489 #endif /* OPENSSL_SYS_WINDOWS */
 490 #ifdef WATT32
 491         extern int _watt_do_exit;
 492         _watt_do_exit = 0;    /* don't make sock_init() call exit() */
 493         if (sock_init())
 494                 return (-1);
 495 #endif
 496
 497 #if defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK)
 498     WORD wVerReq;
 499     WSADATA wsaData;
 500     int err;
 501
 502     if (!wsa_init_done)
 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 #if 0           /* this call is claimed to be non-present in Winsock2 */
 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 *sin4 =
 736                                                 (struct sockaddr_in *)&client;
 737                                         sin4->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         do {
 812         char   h[NI_MAXHOST],s[NI_MAXSERV];
 813         size_t nl;
 814         static union {  void *p;
 815                         int (*f)(const struct sockaddr *,size_t/*socklen_t*/,
 816                                  char *,size_t,char *,size_t,int);
 817                         } p_getnameinfo = {NULL};
 818                         /* 2nd argument to getnameinfo is specified to
 819                          * be socklen_t. Unfortunately there is a number
 820                          * of environments where socklen_t is not defined.
 821                          * As it's passed by value, it's safe to pass it
 822                          * as size_t... <appro> */
 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         }