crypto/bio/b_sock.c

   1 /* crypto/bio/b_sock.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #ifndef NO_SOCK
  60
  61 #include <stdio.h>
  62 #include <stdlib.h>
  63 #include <errno.h>
  64 #define USE_SOCKETS
  65 #include "cryptlib.h"
  66 #include "bio.h"
  67
  68 /*      BIOerr(BIO_F_WSASTARTUP,BIO_R_WSASTARTUP ); */
  69
  70 #ifdef WIN16
  71 #define SOCKET_PROTOCOL 0 /* more microsoft stupidity */
  72 #else
  73 #define SOCKET_PROTOCOL IPPROTO_TCP
  74 #endif
  75
  76 #ifdef SO_MAXCONN
  77 #define MAX_LISTEN  SOMAXCONN
  78 #elif defined(SO_MAXCONN)
  79 #define MAX_LISTEN  SO_MAXCONN
  80 #else
  81 #define MAX_LISTEN  32
  82 #endif
  83
  84 #ifdef WINDOWS
  85 static int wsa_init_done=0;
  86 #endif
  87
  88 static unsigned long BIO_ghbn_hits=0L;
  89 static unsigned long BIO_ghbn_miss=0L;
  90
  91 #define GHBN_NUM        4
  92 static struct ghbn_cache_st
  93         {
  94         char name[129];
  95         struct hostent *ent;
  96         unsigned long order;
  97         } ghbn_cache[GHBN_NUM];
  98
  99 #ifndef NOPROTO
 100 static int get_ip(const char *str,unsigned char *ip);
 101 static void ghbn_free(struct hostent *a);
 102 static struct hostent *ghbn_dup(struct hostent *a);
 103 #else
 104 static int get_ip();
 105 static void ghbn_free();
 106 static struct hostent *ghbn_dup();
 107 #endif
 108
 109 int BIO_get_host_ip(const char *str, unsigned char *ip)
 110         {
 111         int i;
 112         struct hostent *he;
 113
 114         i=get_ip(str,ip);
 115         if (i > 0) return(1);
 116         if (i < 0)
 117                 {
 118                 BIOerr(BIO_F_BIO_GET_HOST_IP,BIO_R_INVALID_IP_ADDRESS);
 119                 ERR_add_error_data(2,"host=",str);
 120                 return(0);
 121                 }
 122         else
 123                 { /* do a gethostbyname */
 124                 if (!BIO_sock_init()) return(0);
 125
 126                 he=BIO_gethostbyname(str);
 127                 if (he == NULL)
 128                         {
 129                         BIOerr(BIO_F_BIO_GET_HOST_IP,BIO_R_BAD_HOSTNAME_LOOKUP);
 130                         ERR_add_error_data(2,"host=",str);
 131                         return(0);
 132                         }
 133
 134                 /* cast to short because of win16 winsock definition */
 135                 if ((short)he->h_addrtype != AF_INET)
 136                         {
 137                         BIOerr(BIO_F_BIO_GET_HOST_IP,BIO_R_GETHOSTBYNAME_ADDR_IS_NOT_AF_INET);
 138                         ERR_add_error_data(2,"host=",str);
 139                         return(0);
 140                         }
 141                 for (i=0; i<4; i++)
 142                         ip[i]=he->h_addr_list[0][i];
 143                 }
 144         return(1);
 145         }
 146
 147 int BIO_get_port(const char *str, unsigned short *port_ptr)
 148         {
 149         int i;
 150         struct servent *s;
 151
 152         if (str == NULL)
 153                 {
 154                 BIOerr(BIO_F_BIO_GET_PORT,BIO_R_NO_PORT_DEFINED);
 155                 return(0);
 156                 }
 157         i=atoi(str);
 158         if (i != 0)
 159                 *port_ptr=(unsigned short)i;
 160         else
 161                 {
 162                 s=getservbyname(str,"tcp");
 163                 if (s == NULL)
 164                         {
 165                         if (strcmp(str,"http") == 0)
 166                                 *port_ptr=80;
 167                         else if (strcmp(str,"telnet") == 0)
 168                                 *port_ptr=23;
 169                         else if (strcmp(str,"socks") == 0)
 170                                 *port_ptr=1080;
 171                         else if (strcmp(str,"https") == 0)
 172                                 *port_ptr=443;
 173                         else if (strcmp(str,"ssl") == 0)
 174                                 *port_ptr=443;
 175                         else if (strcmp(str,"ftp") == 0)
 176                                 *port_ptr=21;
 177                         else if (strcmp(str,"gopher") == 0)
 178                                 *port_ptr=70;
 179 #if 0
 180                         else if (strcmp(str,"wais") == 0)
 181                                 *port_ptr=21;
 182 #endif
 183                         else
 184                                 {
 185                                 SYSerr(SYS_F_GETSERVBYNAME,get_last_socket_error());
 186                                 ERR_add_error_data(3,"service='",str,"'");
 187                                 return(0);
 188                                 }
 189                         return(1);
 190                         }
 191                 *port_ptr=htons((unsigned short)s->s_port);
 192                 }
 193         return(1);
 194         }
 195
 196 int BIO_sock_error(int sock)
 197         {
 198         int j,i,size;
 199
 200         size=sizeof(int);
 201
 202         i=getsockopt(sock,SOL_SOCKET,SO_ERROR,(char *)&j,&size);
 203         if (i < 0)
 204                 return(1);
 205         else
 206                 return(j);
 207         }
 208
 209 long BIO_ghbn_ctrl(int cmd, int iarg, char *parg)
 210         {
 211         int i;
 212         char **p;
 213
 214         switch (cmd)
 215                 {
 216         case BIO_GHBN_CTRL_HITS:
 217                 return(BIO_ghbn_hits);
 218                 /* break; */
 219         case BIO_GHBN_CTRL_MISSES:
 220                 return(BIO_ghbn_miss);
 221                 /* break; */
 222         case BIO_GHBN_CTRL_CACHE_SIZE:
 223                 return(GHBN_NUM);
 224                 /* break; */
 225         case BIO_GHBN_CTRL_GET_ENTRY:
 226                 if ((iarg >= 0) && (iarg <GHBN_NUM) &&
 227                         (ghbn_cache[iarg].order > 0))
 228                         {
 229                         p=(char **)parg;
 230                         if (p == NULL) return(0);
 231                         *p=ghbn_cache[iarg].name;
 232                         ghbn_cache[iarg].name[128]='\0';
 233                         return(1);
 234                         }
 235                 return(0);
 236                 /* break; */
 237         case BIO_GHBN_CTRL_FLUSH:
 238                 for (i=0; i<GHBN_NUM; i++)
 239                         ghbn_cache[i].order=0;
 240                 break;
 241         default:
 242                 return(0);
 243                 }
 244         return(1);
 245         }
 246
 247 static struct hostent *ghbn_dup(struct hostent *a)
 248         {
 249         struct hostent *ret;
 250         int i,j;
 251
 252         MemCheck_off();
 253         ret=(struct hostent *)Malloc(sizeof(struct hostent));
 254         if (ret == NULL) return(NULL);
 255         memset(ret,0,sizeof(struct hostent));
 256
 257         for (i=0; a->h_aliases[i] != NULL; i++)
 258                 ;
 259         i++;
 260         ret->h_aliases=(char **)Malloc(sizeof(char *)*i);
 261         memset(ret->h_aliases,0,sizeof(char *)*i);
 262         if (ret == NULL) goto err;
 263
 264         for (i=0; a->h_addr_list[i] != NULL; i++)
 265                 ;
 266         i++;
 267         ret->h_addr_list=(char **)Malloc(sizeof(char *)*i);
 268         memset(ret->h_addr_list,0,sizeof(char *)*i);
 269         if (ret->h_addr_list == NULL) goto err;
 270
 271         j=strlen(a->h_name)+1;
 272         if ((ret->h_name=Malloc(j)) == NULL) goto err;
 273         memcpy((char *)ret->h_name,a->h_name,j+1);
 274         for (i=0; a->h_aliases[i] != NULL; i++)
 275                 {
 276                 j=strlen(a->h_aliases[i])+1;
 277                 if ((ret->h_aliases[i]=Malloc(j)) == NULL) goto err;
 278                 memcpy(ret->h_aliases[i],a->h_aliases[i],j+1);
 279                 }
 280         ret->h_length=a->h_length;
 281         ret->h_addrtype=a->h_addrtype;
 282         for (i=0; a->h_addr_list[i] != NULL; i++)
 283                 {
 284                 if ((ret->h_addr_list[i]=Malloc(a->h_length)) == NULL)
 285                         goto err;
 286                 memcpy(ret->h_addr_list[i],a->h_addr_list[i],a->h_length);
 287                 }
 288         if (0)
 289                 {
 290 err:
 291                 if (ret != NULL)
 292                         ghbn_free(ret);
 293                 ret=NULL;
 294                 }
 295         MemCheck_on();
 296         return(ret);
 297         }
 298
 299 static void ghbn_free(struct hostent *a)
 300         {
 301         int i;
 302
 303         if(a == NULL)
 304             return;
 305
 306         if (a->h_aliases != NULL)
 307                 {
 308                 for (i=0; a->h_aliases[i] != NULL; i++)
 309                         Free(a->h_aliases[i]);
 310                 Free(a->h_aliases);
 311                 }
 312         if (a->h_addr_list != NULL)
 313                 {
 314                 for (i=0; a->h_addr_list[i] != NULL; i++)
 315                         Free(a->h_addr_list[i]);
 316                 Free(a->h_addr_list);
 317                 }
 318         if (a->h_name != NULL) Free((char *)a->h_name);
 319         Free(a);
 320         }
 321
 322 struct hostent *BIO_gethostbyname(const char *name)
 323         {
 324         struct hostent *ret;
 325         int i,lowi=0,j;
 326         unsigned long low= (unsigned long)-1;
 327
 328 /*      return(gethostbyname(name)); */
 329
 330         CRYPTO_w_lock(CRYPTO_LOCK_BIO_GETHOSTBYNAME);
 331         j=strlen(name);
 332         if (j < 128)
 333                 {
 334                 for (i=0; i<GHBN_NUM; i++)
 335                         {
 336                         if (low > ghbn_cache[i].order)
 337                                 {
 338                                 low=ghbn_cache[i].order;
 339                                 lowi=i;
 340                                 }
 341                         if (ghbn_cache[i].order > 0)
 342                                 {
 343                                 if (strncmp(name,ghbn_cache[i].name,128) == 0)
 344                                         break;
 345                                 }
 346                         }
 347                 }
 348         else
 349                 i=GHBN_NUM;
 350
 351         if (i == GHBN_NUM) /* no hit*/
 352                 {
 353                 BIO_ghbn_miss++;
 354                 ret=gethostbyname(name);
 355
 356                 if (ret == NULL) return(NULL);
 357                 if (j > 128) return(ret); /* too big to cache */
 358
 359                 /* else add to cache */
 360                 if (ghbn_cache[lowi].ent != NULL)
 361                         ghbn_free(ghbn_cache[lowi].ent);
 362
 363                 strncpy(ghbn_cache[lowi].name,name,128);
 364                 ghbn_cache[lowi].ent=ghbn_dup(ret);
 365                 ghbn_cache[lowi].order=BIO_ghbn_miss+BIO_ghbn_hits;
 366                 }
 367         else
 368                 {
 369                 BIO_ghbn_hits++;
 370                 ret= ghbn_cache[i].ent;
 371                 ghbn_cache[i].order=BIO_ghbn_miss+BIO_ghbn_hits;
 372                 }
 373         CRYPTO_w_unlock(CRYPTO_LOCK_BIO_GETHOSTBYNAME);
 374         return(ret);
 375         }
 376
 377 int BIO_sock_init(void)
 378         {
 379 #ifdef WINDOWS
 380         static struct WSAData wsa_state;
 381
 382         if (!wsa_init_done)
 383                 {
 384                 int err;
 385
 386 #ifdef SIGINT
 387                 signal(SIGINT,(void (*)(int))BIO_sock_cleanup);
 388 #endif
 389                 wsa_init_done=1;
 390                 memset(&wsa_state,0,sizeof(wsa_state));
 391                 if (WSAStartup(0x0101,&wsa_state)!=0)
 392                         {
 393                         err=WSAGetLastError();
 394                         SYSerr(SYS_F_WSASTARTUP,err);
 395                         BIOerr(BIO_F_BIO_SOCK_INIT,BIO_R_WSASTARTUP);
 396                         return(-1);
 397                         }
 398                 }
 399 #endif /* WINDOWS */
 400         return(1);
 401         }
 402
 403 void BIO_sock_cleanup(void)
 404         {
 405 #ifdef WINDOWS
 406         if (wsa_init_done)
 407                 {
 408                 wsa_init_done=0;
 409                 WSACancelBlockingCall();
 410                 WSACleanup();
 411                 }
 412 #endif
 413         }
 414
 415 int BIO_socket_ioctl(int fd, long type, unsigned long *arg)
 416         {
 417         int i;
 418
 419         i=ioctlsocket(fd,type,arg);
 420         if (i < 0)
 421                 SYSerr(SYS_F_IOCTLSOCKET,get_last_socket_error());
 422         return(i);
 423         }
 424
 425 /* The reason I have implemented this instead of using sscanf is because
 426  * Visual C 1.52c gives an unresolved external when linking a DLL :-( */
 427 static int get_ip(const char *str, unsigned char ip[4])
 428         {
 429         unsigned int tmp[4];
 430         int num=0,c,ok=0;
 431
 432         tmp[0]=tmp[1]=tmp[2]=tmp[3]=0;
 433
 434         for (;;)
 435                 {
 436                 c= *(str++);
 437                 if ((c >= '0') && (c <= '9'))
 438                         {
 439                         ok=1;
 440                         tmp[num]=tmp[num]*10+c-'0';
 441                         if (tmp[num] > 255) return(-1);
 442                         }
 443                 else if (c == '.')
 444                         {
 445                         if (!ok) return(-1);
 446                         if (num == 3) break;
 447                         num++;
 448                         ok=0;
 449                         }
 450                 else if ((num == 3) && ok)
 451                         break;
 452                 else
 453                         return(0);
 454                 }
 455         ip[0]=tmp[0];
 456         ip[1]=tmp[1];
 457         ip[2]=tmp[2];
 458         ip[3]=tmp[3];
 459         return(1);
 460         }
 461
 462 int BIO_get_accept_socket(char *host, int bind_mode)
 463         {
 464         int ret=0;
 465         struct sockaddr_in server,client;
 466         int s= -1,cs;
 467         unsigned char ip[4];
 468         unsigned short port;
 469         char *str,*e;
 470         const char *h,*p;
 471         unsigned long l;
 472         int err_num;
 473
 474         if (!BIO_sock_init()) return(INVALID_SOCKET);
 475
 476         if ((str=BUF_strdup(host)) == NULL) return(INVALID_SOCKET);
 477
 478         h=p=NULL;
 479         h=str;
 480         for (e=str; *e; e++)
 481                 {
 482                 if (*e == ':')
 483                         {
 484                         p= &(e[1]);
 485                         *e='\0';
 486                         }
 487                 else if (*e == '/')
 488                         {
 489                         *e='\0';
 490                         break;
 491                         }
 492                 }
 493
 494         if (p == NULL)
 495                 {
 496                 p=h;
 497                 h="*";
 498                 }
 499
 500         if (!BIO_get_port(p,&port)) return(INVALID_SOCKET);
 501
 502         memset((char *)&server,0,sizeof(server));
 503         server.sin_family=AF_INET;
 504         server.sin_port=htons(port);
 505
 506         if (strcmp(h,"*") == 0)
 507                 server.sin_addr.s_addr=INADDR_ANY;
 508         else
 509                 {
 510                 if (!BIO_get_host_ip(h,&(ip[0]))) return(INVALID_SOCKET);
 511                 l=(unsigned long)
 512                         ((unsigned long)ip[0]<<24L)|
 513                         ((unsigned long)ip[1]<<16L)|
 514                         ((unsigned long)ip[2]<< 8L)|
 515                         ((unsigned long)ip[3]);
 516                 server.sin_addr.s_addr=htonl(l);
 517                 }
 518
 519 again:
 520         s=socket(AF_INET,SOCK_STREAM,SOCKET_PROTOCOL);
 521         if (s == INVALID_SOCKET)
 522                 {
 523                 SYSerr(SYS_F_SOCKET,get_last_socket_error());
 524                 ERR_add_error_data(3,"port='",host,"'");
 525                 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET,BIO_R_UNABLE_TO_CREATE_SOCKET);
 526                 goto err;
 527                 }
 528
 529 #ifdef SO_REUSEADDR
 530         if (bind_mode == BIO_BIND_REUSEADDR)
 531                 {
 532                 int i=1;
 533
 534                 ret=setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&i,sizeof(i));
 535                 bind_mode=BIO_BIND_NORMAL;
 536                 }
 537 #endif
 538         if (bind(s,(struct sockaddr *)&server,sizeof(server)) == -1)
 539                 {
 540 #ifdef SO_REUSEADDR
 541                 err_num=get_last_socket_error();
 542                 if ((bind_mode == BIO_BIND_REUSEADDR_IF_UNUSED) &&
 543                         (err_num == EADDRINUSE))
 544                         {
 545                         memcpy((char *)&client,(char *)&server,sizeof(server));
 546                         if (strcmp(h,"*") == 0)
 547                                 client.sin_addr.s_addr=htonl(0x7F000001);
 548                         cs=socket(AF_INET,SOCK_STREAM,SOCKET_PROTOCOL);
 549                         if (cs != INVALID_SOCKET)
 550                                 {
 551                                 int ii;
 552                                 ii=connect(cs,(struct sockaddr *)&client,
 553                                         sizeof(client));
 554                                 closesocket(cs);
 555                                 if (ii == INVALID_SOCKET)
 556                                         {
 557                                         bind_mode=BIO_BIND_REUSEADDR;
 558                                         closesocket(s);
 559                                         goto again;
 560                                         }
 561                                 /* else error */
 562                                 }
 563                         /* else error */
 564                         }
 565 #endif
 566                 SYSerr(SYS_F_BIND,err_num);
 567                 ERR_add_error_data(3,"port='",host,"'");
 568                 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET,BIO_R_UNABLE_TO_BIND_SOCKET);
 569                 goto err;
 570                 }
 571         if (listen(s,MAX_LISTEN) == -1)
 572                 {
 573                 SYSerr(SYS_F_BIND,get_last_socket_error());
 574                 ERR_add_error_data(3,"port='",host,"'");
 575                 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET,BIO_R_UNABLE_TO_LISTEN_SOCKET);
 576                 goto err;
 577                 }
 578         ret=1;
 579 err:
 580         if (str != NULL) Free(str);
 581         if ((ret == 0) && (s != INVALID_SOCKET))
 582                 {
 583                 closesocket(s);
 584                 s= INVALID_SOCKET;
 585                 }
 586         return(s);
 587         }
 588
 589 int BIO_accept(int sock, char **addr)
 590         {
 591         int ret=INVALID_SOCKET;
 592         static struct sockaddr_in from;
 593         unsigned long l;
 594         unsigned short port;
 595         int len;
 596         char *p;
 597
 598         memset((char *)&from,0,sizeof(from));
 599         len=sizeof(from);
 600         ret=accept(sock,(struct sockaddr *)&from,&len);
 601         if (ret == INVALID_SOCKET)
 602                 {
 603                 SYSerr(SYS_F_ACCEPT,get_last_socket_error());
 604                 BIOerr(BIO_F_BIO_ACCEPT,BIO_R_ACCEPT_ERROR);
 605                 goto end;
 606                 }
 607
 608         if (addr == NULL) goto end;
 609
 610         l=ntohl(from.sin_addr.s_addr);
 611         port=ntohs(from.sin_port);
 612         if (*addr == NULL)
 613                 {
 614                 if ((p=Malloc(24)) == NULL)
 615                         {
 616                         BIOerr(BIO_F_BIO_ACCEPT,ERR_R_MALLOC_FAILURE);
 617                         goto end;
 618                         }
 619                 *addr=p;
 620                 }
 621         sprintf(*addr,"%d.%d.%d.%d:%d",
 622                 (unsigned char)(l>>24L)&0xff,
 623                 (unsigned char)(l>>16L)&0xff,
 624                 (unsigned char)(l>> 8L)&0xff,
 625                 (unsigned char)(l     )&0xff,
 626                 port);
 627 end:
 628         return(ret);
 629         }
 630
 631 int BIO_set_tcp_ndelay(int s, int on)
 632         {
 633         int ret=0;
 634 #if defined(TCP_NODELAY) && (defined(IPPROTO_TCP) || defined(SOL_TCP))
 635         int opt;
 636
 637 #ifdef SOL_TCP
 638         opt=SOL_TCP;
 639 #else
 640 #ifdef IPPROTO_TCP
 641         opt=IPPROTO_TCP;
 642 #endif
 643 #endif
 644
 645         ret=setsockopt(s,opt,TCP_NODELAY,(char *)&on,sizeof(on));
 646 #endif
 647         return(ret == 0);
 648         }
 649 #endif
 650
 651 int BIO_socket_nbio(int s, int mode)
 652         {
 653         int ret= -1;
 654         unsigned long l;
 655
 656         l=mode;
 657 #ifdef FIONBIO
 658         ret=BIO_socket_ioctl(s,FIONBIO,&l);
 659 #endif
 660         return(ret == 0);
 661         }