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 /*
  92  * WSAAPI specifier is required to make indirect calls to run-time
  93  * linked WinSock 2 functions used in this module, to be specific
  94  * [get|free]addrinfo and getnameinfo. This is because WinSock uses
  95  * uses non-C calling convention, __stdcall vs. __cdecl, on x86
  96  * Windows. On non-WinSock platforms WSAAPI needs to be void.
  97  */
  98 #ifndef WSAAPI
  99 #define WSAAPI
 100 #endif
 101
 102 #if 0
 103 static unsigned long BIO_ghbn_hits=0L;
 104 static unsigned long BIO_ghbn_miss=0L;
 105
 106 #define GHBN_NUM        4
 107 static struct ghbn_cache_st
 108         {
 109         char name[129];
 110         struct hostent *ent;
 111         unsigned long order;
 112         } ghbn_cache[GHBN_NUM];
 113 #endif
 114
 115 static int get_ip(const char *str,unsigned char *ip);
 116 #if 0
 117 static void ghbn_free(struct hostent *a);
 118 static struct hostent *ghbn_dup(struct hostent *a);
 119 #endif
 120 int BIO_get_host_ip(const char *str, unsigned char *ip)
 121         {
 122         int i;
 123         int err = 1;
 124         int locked = 0;
 125         struct hostent *he;
 126
 127         i=get_ip(str,ip);
 128         if (i < 0)
 129                 {
 130                 BIOerr(BIO_F_BIO_GET_HOST_IP,BIO_R_INVALID_IP_ADDRESS);
 131                 goto err;
 132                 }
 133
 134         /* At this point, we have something that is most probably correct
 135            in some way, so let's init the socket. */
 136         if (BIO_sock_init() != 1)
 137                 return 0; /* don't generate another error code here */
 138
 139         /* If the string actually contained an IP address, we need not do
 140            anything more */
 141         if (i > 0) return(1);
 142
 143         /* do a gethostbyname */
 144         CRYPTO_w_lock(CRYPTO_LOCK_GETHOSTBYNAME);
 145         locked = 1;
 146         he=BIO_gethostbyname(str);
 147         if (he == NULL)
 148                 {
 149                 BIOerr(BIO_F_BIO_GET_HOST_IP,BIO_R_BAD_HOSTNAME_LOOKUP);
 150                 goto err;
 151                 }
 152
 153         /* cast to short because of win16 winsock definition */
 154         if ((short)he->h_addrtype != AF_INET)
 155                 {
 156                 BIOerr(BIO_F_BIO_GET_HOST_IP,BIO_R_GETHOSTBYNAME_ADDR_IS_NOT_AF_INET);
 157                 goto err;
 158                 }
 159         for (i=0; i<4; i++)
 160                 ip[i]=he->h_addr_list[0][i];
 161         err = 0;
 162
 163  err:
 164         if (locked)
 165                 CRYPTO_w_unlock(CRYPTO_LOCK_GETHOSTBYNAME);
 166         if (err)
 167                 {
 168                 ERR_add_error_data(2,"host=",str);
 169                 return 0;
 170                 }
 171         else
 172                 return 1;
 173         }
 174
 175 int BIO_get_port(const char *str, unsigned short *port_ptr)
 176         {
 177         int i;
 178         struct servent *s;
 179
 180         if (str == NULL)
 181                 {
 182                 BIOerr(BIO_F_BIO_GET_PORT,BIO_R_NO_PORT_DEFINED);
 183                 return(0);
 184                 }
 185         i=atoi(str);
 186         if (i != 0)
 187                 *port_ptr=(unsigned short)i;
 188         else
 189                 {
 190                 CRYPTO_w_lock(CRYPTO_LOCK_GETSERVBYNAME);
 191                 /* Note: under VMS with SOCKETSHR, it seems like the first
 192                  * parameter is 'char *', instead of 'const char *'
 193                  */
 194 #ifndef CONST_STRICT
 195                 s=getservbyname((char *)str,"tcp");
 196 #else
 197                 s=getservbyname(str,"tcp");
 198 #endif
 199                 if(s != NULL)
 200                         *port_ptr=ntohs((unsigned short)s->s_port);
 201                 CRYPTO_w_unlock(CRYPTO_LOCK_GETSERVBYNAME);
 202                 if(s == NULL)
 203                         {
 204                         if (strcmp(str,"http") == 0)
 205                                 *port_ptr=80;
 206                         else if (strcmp(str,"telnet") == 0)
 207                                 *port_ptr=23;
 208                         else if (strcmp(str,"socks") == 0)
 209                                 *port_ptr=1080;
 210                         else if (strcmp(str,"https") == 0)
 211                                 *port_ptr=443;
 212                         else if (strcmp(str,"ssl") == 0)
 213                                 *port_ptr=443;
 214                         else if (strcmp(str,"ftp") == 0)
 215                                 *port_ptr=21;
 216                         else if (strcmp(str,"gopher") == 0)
 217                                 *port_ptr=70;
 218 #if 0
 219                         else if (strcmp(str,"wais") == 0)
 220                                 *port_ptr=21;
 221 #endif
 222                         else
 223                                 {
 224                                 SYSerr(SYS_F_GETSERVBYNAME,get_last_socket_error());
 225                                 ERR_add_error_data(3,"service='",str,"'");
 226                                 return(0);
 227                                 }
 228                         }
 229                 }
 230         return(1);
 231         }
 232
 233 int BIO_sock_error(int sock)
 234         {
 235         int j,i;
 236         int size;
 237
 238 #if defined(OPENSSL_SYS_BEOS_R5)
 239         return 0;
 240 #endif
 241
 242         size=sizeof(int);
 243         /* Note: under Windows the third parameter is of type (char *)
 244          * whereas under other systems it is (void *) if you don't have
 245          * a cast it will choke the compiler: if you do have a cast then
 246          * you can either go for (char *) or (void *).
 247          */
 248         i=getsockopt(sock,SOL_SOCKET,SO_ERROR,(void *)&j,(void *)&size);
 249         if (i < 0)
 250                 return(1);
 251         else
 252                 return(j);
 253         }
 254
 255 #if 0
 256 long BIO_ghbn_ctrl(int cmd, int iarg, char *parg)
 257         {
 258         int i;
 259         char **p;
 260
 261         switch (cmd)
 262                 {
 263         case BIO_GHBN_CTRL_HITS:
 264                 return(BIO_ghbn_hits);
 265                 /* break; */
 266         case BIO_GHBN_CTRL_MISSES:
 267                 return(BIO_ghbn_miss);
 268                 /* break; */
 269         case BIO_GHBN_CTRL_CACHE_SIZE:
 270                 return(GHBN_NUM);
 271                 /* break; */
 272         case BIO_GHBN_CTRL_GET_ENTRY:
 273                 if ((iarg >= 0) && (iarg <GHBN_NUM) &&
 274                         (ghbn_cache[iarg].order > 0))
 275                         {
 276                         p=(char **)parg;
 277                         if (p == NULL) return(0);
 278                         *p=ghbn_cache[iarg].name;
 279                         ghbn_cache[iarg].name[128]='\0';
 280                         return(1);
 281                         }
 282                 return(0);
 283                 /* break; */
 284         case BIO_GHBN_CTRL_FLUSH:
 285                 for (i=0; i<GHBN_NUM; i++)
 286                         ghbn_cache[i].order=0;
 287                 break;
 288         default:
 289                 return(0);
 290                 }
 291         return(1);
 292         }
 293 #endif
 294
 295 #if 0
 296 static struct hostent *ghbn_dup(struct hostent *a)
 297         {
 298         struct hostent *ret;
 299         int i,j;
 300
 301         MemCheck_off();
 302         ret=(struct hostent *)OPENSSL_malloc(sizeof(struct hostent));
 303         if (ret == NULL) return(NULL);
 304         memset(ret,0,sizeof(struct hostent));
 305
 306         for (i=0; a->h_aliases[i] != NULL; i++)
 307                 ;
 308         i++;
 309         ret->h_aliases = (char **)OPENSSL_malloc(i*sizeof(char *));
 310         if (ret->h_aliases == NULL)
 311                 goto err;
 312         memset(ret->h_aliases, 0, i*sizeof(char *));
 313
 314         for (i=0; a->h_addr_list[i] != NULL; i++)
 315                 ;
 316         i++;
 317         ret->h_addr_list=(char **)OPENSSL_malloc(i*sizeof(char *));
 318         if (ret->h_addr_list == NULL)
 319                 goto err;
 320         memset(ret->h_addr_list, 0, i*sizeof(char *));
 321
 322         j=strlen(a->h_name)+1;
 323         if ((ret->h_name=OPENSSL_malloc(j)) == NULL) goto err;
 324         memcpy((char *)ret->h_name,a->h_name,j);
 325         for (i=0; a->h_aliases[i] != NULL; i++)
 326                 {
 327                 j=strlen(a->h_aliases[i])+1;
 328                 if ((ret->h_aliases[i]=OPENSSL_malloc(j)) == NULL) goto err;
 329                 memcpy(ret->h_aliases[i],a->h_aliases[i],j);
 330                 }
 331         ret->h_length=a->h_length;
 332         ret->h_addrtype=a->h_addrtype;
 333         for (i=0; a->h_addr_list[i] != NULL; i++)
 334                 {
 335                 if ((ret->h_addr_list[i]=OPENSSL_malloc(a->h_length)) == NULL)
 336                         goto err;
 337                 memcpy(ret->h_addr_list[i],a->h_addr_list[i],a->h_length);
 338                 }
 339         if (0)
 340                 {
 341 err:
 342                 if (ret != NULL)
 343                         ghbn_free(ret);
 344                 ret=NULL;
 345                 }
 346         MemCheck_on();
 347         return(ret);
 348         }
 349
 350 static void ghbn_free(struct hostent *a)
 351         {
 352         int i;
 353
 354         if(a == NULL)
 355             return;
 356
 357         if (a->h_aliases != NULL)
 358                 {
 359                 for (i=0; a->h_aliases[i] != NULL; i++)
 360                         OPENSSL_free(a->h_aliases[i]);
 361                 OPENSSL_free(a->h_aliases);
 362                 }
 363         if (a->h_addr_list != NULL)
 364                 {
 365                 for (i=0; a->h_addr_list[i] != NULL; i++)
 366                         OPENSSL_free(a->h_addr_list[i]);
 367                 OPENSSL_free(a->h_addr_list);
 368                 }
 369         if (a->h_name != NULL) OPENSSL_free(a->h_name);
 370         OPENSSL_free(a);
 371         }
 372
 373 #endif
 374
 375 struct hostent *BIO_gethostbyname(const char *name)
 376         {
 377 #if 1
 378         /* Caching gethostbyname() results forever is wrong,
 379          * so we have to let the true gethostbyname() worry about this */
 380 #if (defined(NETWARE_BSDSOCK) && !defined(__NOVELL_LIBC__))
 381         return gethostbyname((char*)name);
 382 #else
 383         return gethostbyname(name);
 384 #endif
 385 #else
 386         struct hostent *ret;
 387         int i,lowi=0,j;
 388         unsigned long low= (unsigned long)-1;
 389
 390
 391 #  if 0
 392         /* It doesn't make sense to use locking here: The function interface
 393          * is not thread-safe, because threads can never be sure when
 394          * some other thread destroys the data they were given a pointer to.
 395          */
 396         CRYPTO_w_lock(CRYPTO_LOCK_GETHOSTBYNAME);
 397 #  endif
 398         j=strlen(name);
 399         if (j < 128)
 400                 {
 401                 for (i=0; i<GHBN_NUM; i++)
 402                         {
 403                         if (low > ghbn_cache[i].order)
 404                                 {
 405                                 low=ghbn_cache[i].order;
 406                                 lowi=i;
 407                                 }
 408                         if (ghbn_cache[i].order > 0)
 409                                 {
 410                                 if (strncmp(name,ghbn_cache[i].name,128) == 0)
 411                                         break;
 412                                 }
 413                         }
 414                 }
 415         else
 416                 i=GHBN_NUM;
 417
 418         if (i == GHBN_NUM) /* no hit*/
 419                 {
 420                 BIO_ghbn_miss++;
 421                 /* Note: under VMS with SOCKETSHR, it seems like the first
 422                  * parameter is 'char *', instead of 'const char *'
 423                  */
 424 #  ifndef CONST_STRICT
 425                 ret=gethostbyname((char *)name);
 426 #  else
 427                 ret=gethostbyname(name);
 428 #  endif
 429
 430                 if (ret == NULL)
 431                         goto end;
 432                 if (j > 128) /* too big to cache */
 433                         {
 434 #  if 0
 435                         /* If we were trying to make this function thread-safe (which
 436                          * is bound to fail), we'd have to give up in this case
 437                          * (or allocate more memory). */
 438                         ret = NULL;
 439 #  endif
 440                         goto end;
 441                         }
 442
 443                 /* else add to cache */
 444                 if (ghbn_cache[lowi].ent != NULL)
 445                         ghbn_free(ghbn_cache[lowi].ent); /* XXX not thread-safe */
 446                 ghbn_cache[lowi].name[0] = '\0';
 447
 448                 if((ret=ghbn_cache[lowi].ent=ghbn_dup(ret)) == NULL)
 449                         {
 450                         BIOerr(BIO_F_BIO_GETHOSTBYNAME,ERR_R_MALLOC_FAILURE);
 451                         goto end;
 452                         }
 453                 strncpy(ghbn_cache[lowi].name,name,128);
 454                 ghbn_cache[lowi].order=BIO_ghbn_miss+BIO_ghbn_hits;
 455                 }
 456         else
 457                 {
 458                 BIO_ghbn_hits++;
 459                 ret= ghbn_cache[i].ent;
 460                 ghbn_cache[i].order=BIO_ghbn_miss+BIO_ghbn_hits;
 461                 }
 462 end:
 463 #  if 0
 464         CRYPTO_w_unlock(CRYPTO_LOCK_GETHOSTBYNAME);
 465 #  endif
 466         return(ret);
 467 #endif
 468         }
 469
 470
 471 int BIO_sock_init(void)
 472         {
 473 #ifdef OPENSSL_SYS_WINDOWS
 474         static struct WSAData wsa_state;
 475
 476         if (!wsa_init_done)
 477                 {
 478                 int err;
 479
 480                 wsa_init_done=1;
 481                 memset(&wsa_state,0,sizeof(wsa_state));
 482                 /* Not making wsa_state available to the rest of the
 483                  * code is formally wrong. But the structures we use
 484                  * are [beleived to be] invariable among Winsock DLLs,
 485                  * while API availability is [expected to be] probed
 486                  * at run-time with DSO_global_lookup. */
 487                 if (WSAStartup(0x0202,&wsa_state)!=0)
 488                         {
 489                         err=WSAGetLastError();
 490                         SYSerr(SYS_F_WSASTARTUP,err);
 491                         BIOerr(BIO_F_BIO_SOCK_INIT,BIO_R_WSASTARTUP);
 492                         return(-1);
 493                         }
 494                 }
 495 #endif /* OPENSSL_SYS_WINDOWS */
 496 #ifdef WATT32
 497         extern int _watt_do_exit;
 498         _watt_do_exit = 0;    /* don't make sock_init() call exit() */
 499         if (sock_init())
 500                 return (-1);
 501 #endif
 502
 503 #if defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK)
 504     WORD wVerReq;
 505     WSADATA wsaData;
 506     int err;
 507
 508     if (!wsa_init_done)
 509     {
 510         wsa_init_done=1;
 511         wVerReq = MAKEWORD( 2, 0 );
 512         err = WSAStartup(wVerReq,&wsaData);
 513         if (err != 0)
 514         {
 515             SYSerr(SYS_F_WSASTARTUP,err);
 516             BIOerr(BIO_F_BIO_SOCK_INIT,BIO_R_WSASTARTUP);
 517             return(-1);
 518                         }
 519                 }
 520 #endif
 521
 522         return(1);
 523         }
 524
 525 void BIO_sock_cleanup(void)
 526         {
 527 #ifdef OPENSSL_SYS_WINDOWS
 528         if (wsa_init_done)
 529                 {
 530                 wsa_init_done=0;
 531 #if 0           /* this call is claimed to be non-present in Winsock2 */
 532                 WSACancelBlockingCall();
 533 #endif
 534                 WSACleanup();
 535                 }
 536 #elif defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK)
 537    if (wsa_init_done)
 538         {
 539         wsa_init_done=0;
 540         WSACleanup();
 541                 }
 542 #endif
 543         }
 544
 545 #if !defined(OPENSSL_SYS_VMS) || __VMS_VER >= 70000000
 546
 547 int BIO_socket_ioctl(int fd, long type, void *arg)
 548         {
 549         int i;
 550
 551 #ifdef __DJGPP__
 552         i=ioctlsocket(fd,type,(char *)arg);
 553 #else
 554         i=ioctlsocket(fd,type,arg);
 555 #endif /* __DJGPP__ */
 556         if (i < 0)
 557                 SYSerr(SYS_F_IOCTLSOCKET,get_last_socket_error());
 558         return(i);
 559         }
 560 #endif /* __VMS_VER */
 561
 562 /* The reason I have implemented this instead of using sscanf is because
 563  * Visual C 1.52c gives an unresolved external when linking a DLL :-( */
 564 static int get_ip(const char *str, unsigned char ip[4])
 565         {
 566         unsigned int tmp[4];
 567         int num=0,c,ok=0;
 568
 569         tmp[0]=tmp[1]=tmp[2]=tmp[3]=0;
 570
 571         for (;;)
 572                 {
 573                 c= *(str++);
 574                 if ((c >= '0') && (c <= '9'))
 575                         {
 576                         ok=1;
 577                         tmp[num]=tmp[num]*10+c-'0';
 578                         if (tmp[num] > 255) return(0);
 579                         }
 580                 else if (c == '.')
 581                         {
 582                         if (!ok) return(-1);
 583                         if (num == 3) return(0);
 584                         num++;
 585                         ok=0;
 586                         }
 587                 else if (c == '\0' && (num == 3) && ok)
 588                         break;
 589                 else
 590                         return(0);
 591                 }
 592         ip[0]=tmp[0];
 593         ip[1]=tmp[1];
 594         ip[2]=tmp[2];
 595         ip[3]=tmp[3];
 596         return(1);
 597         }
 598
 599 int BIO_get_accept_socket(char *host, int bind_mode)
 600         {
 601         int ret=0;
 602         union {
 603                 struct sockaddr sa;
 604                 struct sockaddr_in sa_in;
 605 #if OPENSSL_USE_IPV6
 606                 struct sockaddr_in6 sa_in6;
 607 #endif
 608         } server,client;
 609         int s=INVALID_SOCKET,cs;
 610         unsigned char ip[4];
 611         unsigned short port;
 612         char *str=NULL,*e;
 613         char *h,*p;
 614         unsigned long l;
 615         int err_num;
 616
 617         if (BIO_sock_init() != 1) return(INVALID_SOCKET);
 618
 619         if ((str=BUF_strdup(host)) == NULL) return(INVALID_SOCKET);
 620
 621         h=p=NULL;
 622         h=str;
 623         for (e=str; *e; e++)
 624                 {
 625                 if (*e == ':')
 626                         {
 627                         p=e;
 628                         }
 629                 else if (*e == '/')
 630                         {
 631                         *e='\0';
 632                         break;
 633                         }
 634                 }
 635         if (p)  *p++='\0';      /* points at last ':', '::port' is special [see below] */
 636         else    p=h,h=NULL;
 637
 638 #ifdef EAI_FAMILY
 639         do {
 640         static union {  void *p;
 641                         int (WSAAPI *f)(const char *,const char *,
 642                                  const struct addrinfo *,
 643                                  struct addrinfo **);
 644                         } p_getaddrinfo = {NULL};
 645         static union {  void *p;
 646                         void (WSAAPI *f)(struct addrinfo *);
 647                         } p_freeaddrinfo = {NULL};
 648         struct addrinfo *res,hint;
 649
 650         if (p_getaddrinfo.p==NULL)
 651                 {
 652                 if ((p_getaddrinfo.p=DSO_global_lookup("getaddrinfo"))==NULL ||
 653                     (p_freeaddrinfo.p=DSO_global_lookup("freeaddrinfo"))==NULL)
 654                         p_getaddrinfo.p=(void*)-1;
 655                 }
 656         if (p_getaddrinfo.p==(void *)-1) break;
 657
 658         /* '::port' enforces IPv6 wildcard listener. Some OSes,
 659          * e.g. Solaris, default to IPv6 without any hint. Also
 660          * note that commonly IPv6 wildchard socket can service
 661          * IPv4 connections just as well...  */
 662         memset(&hint,0,sizeof(hint));
 663         if (h)
 664                 {
 665                 if (strchr(h,':'))
 666                         {
 667                         if (h[1]=='\0') h=NULL;
 668 #if OPENSSL_USE_IPV6
 669                         hint.ai_family = AF_INET6;
 670 #else
 671                         h=NULL;
 672 #endif
 673                         }
 674                 else if (h[0]=='*' && h[1]=='\0')
 675                         h=NULL;
 676                 }
 677
 678         if ((*p_getaddrinfo.f)(h,p,&hint,&res)) break;
 679
 680         memcpy(&server, res->ai_addr,
 681                 res->ai_addrlen<=sizeof(server)?res->ai_addrlen:sizeof(server));
 682
 683         (*p_freeaddrinfo.f)(res);
 684         goto again;
 685         } while (0);
 686 #endif
 687
 688         if (!BIO_get_port(p,&port)) goto err;
 689
 690         memset((char *)&server,0,sizeof(server));
 691         server.sa_in.sin_family=AF_INET;
 692         server.sa_in.sin_port=htons(port);
 693
 694         if (h == NULL || strcmp(h,"*") == 0)
 695                 server.sa_in.sin_addr.s_addr=INADDR_ANY;
 696         else
 697                 {
 698                 if (!BIO_get_host_ip(h,&(ip[0]))) goto err;
 699                 l=(unsigned long)
 700                         ((unsigned long)ip[0]<<24L)|
 701                         ((unsigned long)ip[1]<<16L)|
 702                         ((unsigned long)ip[2]<< 8L)|
 703                         ((unsigned long)ip[3]);
 704                 server.sa_in.sin_addr.s_addr=htonl(l);
 705                 }
 706
 707 again:
 708         s=socket(server.sa.sa_family,SOCK_STREAM,SOCKET_PROTOCOL);
 709         if (s == INVALID_SOCKET)
 710                 {
 711                 SYSerr(SYS_F_SOCKET,get_last_socket_error());
 712                 ERR_add_error_data(3,"port='",host,"'");
 713                 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET,BIO_R_UNABLE_TO_CREATE_SOCKET);
 714                 goto err;
 715                 }
 716
 717 #ifdef SO_REUSEADDR
 718         if (bind_mode == BIO_BIND_REUSEADDR)
 719                 {
 720                 int i=1;
 721
 722                 ret=setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&i,sizeof(i));
 723                 bind_mode=BIO_BIND_NORMAL;
 724                 }
 725 #endif
 726         if (bind(s,&server.sa,sizeof(server)) == -1)
 727                 {
 728 #ifdef SO_REUSEADDR
 729                 err_num=get_last_socket_error();
 730                 if ((bind_mode == BIO_BIND_REUSEADDR_IF_UNUSED) &&
 731                         (err_num == EADDRINUSE))
 732                         {
 733                         client = server;
 734                         if (h == NULL || strcmp(h,"*") == 0)
 735                                 {
 736 #if OPENSSL_USE_IPV6
 737                                 if (client.sa.sa_family == AF_INET6)
 738                                         {
 739                                         memset(&client.sa_in6.sin6_addr,0,sizeof(client.sa_in6.sin6_addr));
 740                                         client.sa_in6.sin6_addr.s6_addr[15]=1;
 741                                         }
 742                                 else
 743 #endif
 744                                 if (client.sa.sa_family == AF_INET)
 745                                         {
 746                                         client.sa_in.sin_addr.s_addr=htonl(0x7F000001);
 747                                         }
 748                                 else    goto err;
 749                                 }
 750                         cs=socket(client.sa.sa_family,SOCK_STREAM,SOCKET_PROTOCOL);
 751                         if (cs != INVALID_SOCKET)
 752                                 {
 753                                 int ii;
 754                                 ii=connect(cs,&client.sa,sizeof(client));
 755                                 closesocket(cs);
 756                                 if (ii == INVALID_SOCKET)
 757                                         {
 758                                         bind_mode=BIO_BIND_REUSEADDR;
 759                                         closesocket(s);
 760                                         goto again;
 761                                         }
 762                                 /* else error */
 763                                 }
 764                         /* else error */
 765                         }
 766 #endif
 767                 SYSerr(SYS_F_BIND,err_num);
 768                 ERR_add_error_data(3,"port='",host,"'");
 769                 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET,BIO_R_UNABLE_TO_BIND_SOCKET);
 770                 goto err;
 771                 }
 772         if (listen(s,MAX_LISTEN) == -1)
 773                 {
 774                 SYSerr(SYS_F_BIND,get_last_socket_error());
 775                 ERR_add_error_data(3,"port='",host,"'");
 776                 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET,BIO_R_UNABLE_TO_LISTEN_SOCKET);
 777                 goto err;
 778                 }
 779         ret=1;
 780 err:
 781         if (str != NULL) OPENSSL_free(str);
 782         if ((ret == 0) && (s != INVALID_SOCKET))
 783                 {
 784                 closesocket(s);
 785                 s= INVALID_SOCKET;
 786                 }
 787         return(s);
 788         }
 789
 790 int BIO_accept(int sock, char **addr)
 791         {
 792         int ret=INVALID_SOCKET;
 793         unsigned long l;
 794         unsigned short port;
 795         char *p;
 796
 797         struct {
 798         /*
 799          * As for following union. Trouble is that there are platforms
 800          * that have socklen_t and there are platforms that don't, on
 801          * some platforms socklen_t is int and on some size_t. So what
 802          * one can do? One can cook #ifdef spaghetti, which is nothing
 803          * but masochistic. Or one can do union between int and size_t.
 804          * One naturally does it primarily for 64-bit platforms where
 805          * sizeof(int) != sizeof(size_t). But would it work? Note that
 806          * if size_t member is initialized to 0, then later int member
 807          * assignment naturally does the job on little-endian platforms
 808          * regardless accept's expectations! What about big-endians?
 809          * If accept expects int*, then it works, and if size_t*, then
 810          * length value would appear as unreasonably large. But this
 811          * won't prevent it from filling in the address structure. The
 812          * trouble of course would be if accept returns more data than
 813          * actual buffer can accomodate and overwrite stack... That's
 814          * where early OPENSSL_assert comes into picture. Besides, the
 815          * only 64-bit big-endian platform found so far that expects
 816          * size_t* is HP-UX, where stack grows towards higher address.
 817          * <appro>
 818          */
 819         union { size_t s; int i; } len;
 820         union {
 821                 struct sockaddr sa;
 822                 struct sockaddr_in sa_in;
 823 #if OPENSSL_USE_IPV6
 824                 struct sockaddr_in6 sa_in6;
 825 #endif
 826                 } from;
 827         } sa;
 828
 829         sa.len.s=0;
 830         sa.len.i=sizeof(sa.from);
 831         memset(&sa.from,0,sizeof(sa.from));
 832         ret=accept(sock,&sa.from.sa,(void *)&sa.len);
 833         if (sizeof(sa.len.i)!=sizeof(sa.len.s) && sa.len.i==0)
 834                 {
 835                 OPENSSL_assert(sa.len.s<=sizeof(sa.from));
 836                 sa.len.i = (int)sa.len.s;
 837                 /* use sa.len.i from this point */
 838                 }
 839         if (ret == INVALID_SOCKET)
 840                 {
 841                 if(BIO_sock_should_retry(ret)) return -2;
 842                 SYSerr(SYS_F_ACCEPT,get_last_socket_error());
 843                 BIOerr(BIO_F_BIO_ACCEPT,BIO_R_ACCEPT_ERROR);
 844                 goto end;
 845                 }
 846
 847         if (addr == NULL) goto end;
 848
 849 #ifdef EAI_FAMILY
 850         do {
 851         char   h[NI_MAXHOST],s[NI_MAXSERV];
 852         size_t nl;
 853         static union {  void *p;
 854                         int (WSAAPI *f)(const struct sockaddr *,size_t/*socklen_t*/,
 855                                  char *,size_t,char *,size_t,int);
 856                         } p_getnameinfo = {NULL};
 857                         /* 2nd argument to getnameinfo is specified to
 858                          * be socklen_t. Unfortunately there is a number
 859                          * of environments where socklen_t is not defined.
 860                          * As it's passed by value, it's safe to pass it
 861                          * as size_t... <appro> */
 862
 863         if (p_getnameinfo.p==NULL)
 864                 {
 865                 if ((p_getnameinfo.p=DSO_global_lookup("getnameinfo"))==NULL)
 866                         p_getnameinfo.p=(void*)-1;
 867                 }
 868         if (p_getnameinfo.p==(void *)-1) break;
 869
 870         if ((*p_getnameinfo.f)(&sa.from.sa,sa.len.i,h,sizeof(h),s,sizeof(s),
 871             NI_NUMERICHOST|NI_NUMERICSERV)) break;
 872         nl = strlen(h)+strlen(s)+2;
 873         p = *addr;
 874         if (p)  { *p = '\0'; p = OPENSSL_realloc(p,nl); }
 875         else    { p = OPENSSL_malloc(nl);               }
 876         if (p==NULL)
 877                 {
 878                 BIOerr(BIO_F_BIO_ACCEPT,ERR_R_MALLOC_FAILURE);
 879                 goto end;
 880                 }
 881         *addr = p;
 882         BIO_snprintf(*addr,nl,"%s:%s",h,s);
 883         goto end;
 884         } while(0);
 885 #endif
 886         if (sa.from.sa.sa_family != AF_INET) goto end;
 887         l=ntohl(sa.from.sa_in.sin_addr.s_addr);
 888         port=ntohs(sa.from.sa_in.sin_port);
 889         if (*addr == NULL)
 890                 {
 891                 if ((p=OPENSSL_malloc(24)) == NULL)
 892                         {
 893                         BIOerr(BIO_F_BIO_ACCEPT,ERR_R_MALLOC_FAILURE);
 894                         goto end;
 895                         }
 896                 *addr=p;
 897                 }
 898         BIO_snprintf(*addr,24,"%d.%d.%d.%d:%d",
 899                      (unsigned char)(l>>24L)&0xff,
 900                      (unsigned char)(l>>16L)&0xff,
 901                      (unsigned char)(l>> 8L)&0xff,
 902                      (unsigned char)(l     )&0xff,
 903                      port);
 904 end:
 905         return(ret);
 906         }
 907
 908 int BIO_set_tcp_ndelay(int s, int on)
 909         {
 910         int ret=0;
 911 #if defined(TCP_NODELAY) && (defined(IPPROTO_TCP) || defined(SOL_TCP))
 912         int opt;
 913
 914 #ifdef SOL_TCP
 915         opt=SOL_TCP;
 916 #else
 917 #ifdef IPPROTO_TCP
 918         opt=IPPROTO_TCP;
 919 #endif
 920 #endif
 921
 922         ret=setsockopt(s,opt,TCP_NODELAY,(char *)&on,sizeof(on));
 923 #endif
 924         return(ret == 0);
 925         }
 926 #endif
 927
 928 int BIO_socket_nbio(int s, int mode)
 929         {
 930         int ret= -1;
 931         int l;
 932
 933         l=mode;
 934 #ifdef FIONBIO
 935         ret=BIO_socket_ioctl(s,FIONBIO,&l);
 936 #endif
 937         return(ret == 0);
 938         }