Build the crypto test applications as well.
[openssl.git] / 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 <openssl/bio.h>
67
68 #ifdef WIN16
69 #define SOCKET_PROTOCOL 0 /* more microsoft stupidity */
70 #else
71 #define SOCKET_PROTOCOL IPPROTO_TCP
72 #endif
73
74 #ifdef SO_MAXCONN
75 #define MAX_LISTEN  SOMAXCONN
76 #elif defined(SO_MAXCONN)
77 #define MAX_LISTEN  SO_MAXCONN
78 #else
79 #define MAX_LISTEN  32
80 #endif
81
82 #ifdef WINDOWS
83 static int wsa_init_done=0;
84 #endif
85
86 static unsigned long BIO_ghbn_hits=0L;
87 static unsigned long BIO_ghbn_miss=0L;
88
89 #define GHBN_NUM        4
90 static struct ghbn_cache_st
91         {
92         char name[129];
93         struct hostent *ent;
94         unsigned long order;
95         } ghbn_cache[GHBN_NUM];
96
97 static int get_ip(const char *str,unsigned char *ip);
98 static void ghbn_free(struct hostent *a);
99 static struct hostent *ghbn_dup(struct hostent *a);
100 int BIO_get_host_ip(const char *str, unsigned char *ip)
101         {
102         int i;
103         int err = 1;
104         int locked = 0;
105         struct hostent *he;
106
107         i=get_ip(str,ip);
108         if (i > 0) return(1);
109         if (i < 0)
110                 {
111                 BIOerr(BIO_F_BIO_GET_HOST_IP,BIO_R_INVALID_IP_ADDRESS);
112                 goto err;
113                 }
114
115         /* do a gethostbyname */
116         if (!BIO_sock_init())
117                 return(0); /* don't generate another error code here */
118
119         CRYPTO_w_lock(CRYPTO_LOCK_GETHOSTBYNAME);
120         locked = 1;
121         he=BIO_gethostbyname(str);
122         if (he == NULL)
123                 {
124                 BIOerr(BIO_F_BIO_GET_HOST_IP,BIO_R_BAD_HOSTNAME_LOOKUP);
125                 goto err;
126                 }
127
128         /* cast to short because of win16 winsock definition */
129         if ((short)he->h_addrtype != AF_INET)
130                 {
131                 BIOerr(BIO_F_BIO_GET_HOST_IP,BIO_R_GETHOSTBYNAME_ADDR_IS_NOT_AF_INET);
132                 goto err;
133                 }
134         for (i=0; i<4; i++)
135                 ip[i]=he->h_addr_list[0][i];
136         err = 0;
137
138  err:
139         if (locked)
140                 CRYPTO_w_unlock(CRYPTO_LOCK_GETHOSTBYNAME);
141         if (err)
142                 {
143                 ERR_add_error_data(2,"host=",str);
144                 return 0;
145                 }
146         else
147                 return 1;
148         }
149
150 int BIO_get_port(const char *str, unsigned short *port_ptr)
151         {
152         int i;
153         struct servent *s;
154
155         if (str == NULL)
156                 {
157                 BIOerr(BIO_F_BIO_GET_PORT,BIO_R_NO_PORT_DEFINED);
158                 return(0);
159                 }
160         i=atoi(str);
161         if (i != 0)
162                 *port_ptr=(unsigned short)i;
163         else
164                 {
165                 CRYPTO_w_lock(CRYPTO_LOCK_GETSERVBYNAME);
166                 s=getservbyname(str,"tcp");
167                 if(s != NULL)
168                         *port_ptr=ntohs((unsigned short)s->s_port);
169                 CRYPTO_w_unlock(CRYPTO_LOCK_GETSERVBYNAME);
170                 if(s == NULL)
171                         {
172                         if (strcmp(str,"http") == 0)
173                                 *port_ptr=80;
174                         else if (strcmp(str,"telnet") == 0)
175                                 *port_ptr=23;
176                         else if (strcmp(str,"socks") == 0)
177                                 *port_ptr=1080;
178                         else if (strcmp(str,"https") == 0)
179                                 *port_ptr=443;
180                         else if (strcmp(str,"ssl") == 0)
181                                 *port_ptr=443;
182                         else if (strcmp(str,"ftp") == 0)
183                                 *port_ptr=21;
184                         else if (strcmp(str,"gopher") == 0)
185                                 *port_ptr=70;
186 #if 0
187                         else if (strcmp(str,"wais") == 0)
188                                 *port_ptr=21;
189 #endif
190                         else
191                                 {
192                                 SYSerr(SYS_F_GETSERVBYNAME,get_last_socket_error());
193                                 ERR_add_error_data(3,"service='",str,"'");
194                                 return(0);
195                                 }
196                         }
197                 }
198         return(1);
199         }
200
201 int BIO_sock_error(int sock)
202         {
203         int j,i;
204         int size;
205                  
206         size=sizeof(int);
207         /* Note: under Windows the third parameter is of type (char *)
208          * whereas under other systems it is (void *) if you don't have
209          * a cast it will choke the compiler: if you do have a cast then
210          * you can either go for (char *) or (void *).
211          */
212         i=getsockopt(sock,SOL_SOCKET,SO_ERROR,(void *)&j,(void *)&size);
213         if (i < 0)
214                 return(1);
215         else
216                 return(j);
217         }
218
219 long BIO_ghbn_ctrl(int cmd, int iarg, char *parg)
220         {
221         int i;
222         char **p;
223
224         switch (cmd)
225                 {
226         case BIO_GHBN_CTRL_HITS:
227                 return(BIO_ghbn_hits);
228                 /* break; */
229         case BIO_GHBN_CTRL_MISSES:
230                 return(BIO_ghbn_miss);
231                 /* break; */
232         case BIO_GHBN_CTRL_CACHE_SIZE:
233                 return(GHBN_NUM);
234                 /* break; */
235         case BIO_GHBN_CTRL_GET_ENTRY:
236                 if ((iarg >= 0) && (iarg <GHBN_NUM) &&
237                         (ghbn_cache[iarg].order > 0))
238                         {
239                         p=(char **)parg;
240                         if (p == NULL) return(0);
241                         *p=ghbn_cache[iarg].name;
242                         ghbn_cache[iarg].name[128]='\0';
243                         return(1);
244                         }
245                 return(0);
246                 /* break; */
247         case BIO_GHBN_CTRL_FLUSH:
248                 for (i=0; i<GHBN_NUM; i++)
249                         ghbn_cache[i].order=0;
250                 break;
251         default:
252                 return(0);
253                 }
254         return(1);
255         }
256
257 static struct hostent *ghbn_dup(struct hostent *a)
258         {
259         struct hostent *ret;
260         int i,j;
261
262         MemCheck_off();
263         ret=(struct hostent *)Malloc(sizeof(struct hostent));
264         if (ret == NULL) return(NULL);
265         memset(ret,0,sizeof(struct hostent));
266
267         for (i=0; a->h_aliases[i] != NULL; i++)
268                 ;
269         i++;
270         ret->h_aliases = (char **)Malloc(i*sizeof(char *));
271         if (ret->h_aliases == NULL)
272                 goto err;
273         memset(ret->h_aliases, 0, i*sizeof(char *));
274
275         for (i=0; a->h_addr_list[i] != NULL; i++)
276                 ;
277         i++;
278         ret->h_addr_list=(char **)Malloc(i*sizeof(char *));
279         if (ret->h_addr_list == NULL)
280                 goto err;
281         memset(ret->h_addr_list, 0, i*sizeof(char *));
282
283         j=strlen(a->h_name)+1;
284         if ((ret->h_name=Malloc(j)) == NULL) goto err;
285         memcpy((char *)ret->h_name,a->h_name,j);
286         for (i=0; a->h_aliases[i] != NULL; i++)
287                 {
288                 j=strlen(a->h_aliases[i])+1;
289                 if ((ret->h_aliases[i]=Malloc(j)) == NULL) goto err;
290                 memcpy(ret->h_aliases[i],a->h_aliases[i],j);
291                 }
292         ret->h_length=a->h_length;
293         ret->h_addrtype=a->h_addrtype;
294         for (i=0; a->h_addr_list[i] != NULL; i++)
295                 {
296                 if ((ret->h_addr_list[i]=Malloc(a->h_length)) == NULL)
297                         goto err;
298                 memcpy(ret->h_addr_list[i],a->h_addr_list[i],a->h_length);
299                 }
300         if (0)
301                 {
302 err:    
303                 if (ret != NULL)
304                         ghbn_free(ret);
305                 ret=NULL;
306                 }
307         MemCheck_on();
308         return(ret);
309         }
310
311 static void ghbn_free(struct hostent *a)
312         {
313         int i;
314
315         if(a == NULL)
316             return;
317
318         if (a->h_aliases != NULL)
319                 {
320                 for (i=0; a->h_aliases[i] != NULL; i++)
321                         Free(a->h_aliases[i]);
322                 Free(a->h_aliases);
323                 }
324         if (a->h_addr_list != NULL)
325                 {
326                 for (i=0; a->h_addr_list[i] != NULL; i++)
327                         Free(a->h_addr_list[i]);
328                 Free(a->h_addr_list);
329                 }
330         if (a->h_name != NULL) Free((char *)a->h_name);
331         Free(a);
332         }
333
334 struct hostent *BIO_gethostbyname(const char *name)
335         {
336         struct hostent *ret;
337         int i,lowi=0,j;
338         unsigned long low= (unsigned long)-1;
339
340 /*      return(gethostbyname(name)); */
341
342 #if 0 /* It doesn't make sense to use locking here: The function interface
343            * is not thread-safe, because threads can never be sure when
344            * some other thread destroys the data they were given a pointer to.
345            */
346         CRYPTO_w_lock(CRYPTO_LOCK_GETHOSTBYNAME);
347 #endif
348         j=strlen(name);
349         if (j < 128)
350                 {
351                 for (i=0; i<GHBN_NUM; i++)
352                         {
353                         if (low > ghbn_cache[i].order)
354                                 {
355                                 low=ghbn_cache[i].order;
356                                 lowi=i;
357                                 }
358                         if (ghbn_cache[i].order > 0)
359                                 {
360                                 if (strncmp(name,ghbn_cache[i].name,128) == 0)
361                                         break;
362                                 }
363                         }
364                 }
365         else
366                 i=GHBN_NUM;
367
368         if (i == GHBN_NUM) /* no hit*/
369                 {
370                 BIO_ghbn_miss++;
371                 ret=gethostbyname(name);
372
373                 if (ret == NULL)
374                         goto end;
375                 if (j > 128) /* too big to cache */
376                         {
377 #if 0 /* If we were trying to make this function thread-safe (which
378            * is bound to fail), we'd have to give up in this case
379            * (or allocate more memory). */
380                         ret = NULL;
381 #endif
382                         goto end;
383                         }
384
385                 /* else add to cache */
386                 if (ghbn_cache[lowi].ent != NULL)
387                         ghbn_free(ghbn_cache[lowi].ent); /* XXX not thread-safe */
388                 ghbn_cache[lowi].name[0] = '\0';
389
390                 if((ret=ghbn_cache[lowi].ent=ghbn_dup(ret)) == NULL)
391                         {
392                         BIOerr(BIO_F_BIO_GETHOSTBYNAME,ERR_R_MALLOC_FAILURE);
393                         goto end;
394                         }
395                 strncpy(ghbn_cache[lowi].name,name,128);
396                 ghbn_cache[lowi].order=BIO_ghbn_miss+BIO_ghbn_hits;
397                 }
398         else
399                 {
400                 BIO_ghbn_hits++;
401                 ret= ghbn_cache[i].ent;
402                 ghbn_cache[i].order=BIO_ghbn_miss+BIO_ghbn_hits;
403                 }
404 end:
405 #if 0
406         CRYPTO_w_unlock(CRYPTO_LOCK_GETHOSTBYNAME);
407 #endif
408         return(ret);
409         }
410
411 int BIO_sock_init(void)
412         {
413 #ifdef WINDOWS
414         static struct WSAData wsa_state;
415
416         if (!wsa_init_done)
417                 {
418                 int err;
419           
420 #ifdef SIGINT
421                 signal(SIGINT,(void (*)(int))BIO_sock_cleanup);
422 #endif
423                 wsa_init_done=1;
424                 memset(&wsa_state,0,sizeof(wsa_state));
425                 if (WSAStartup(0x0101,&wsa_state)!=0)
426                         {
427                         err=WSAGetLastError();
428                         SYSerr(SYS_F_WSASTARTUP,err);
429                         BIOerr(BIO_F_BIO_SOCK_INIT,BIO_R_WSASTARTUP);
430                         return(-1);
431                         }
432                 }
433 #endif /* WINDOWS */
434         return(1);
435         }
436
437 void BIO_sock_cleanup(void)
438         {
439 #ifdef WINDOWS
440         if (wsa_init_done)
441                 {
442                 wsa_init_done=0;
443                 WSACancelBlockingCall();
444                 WSACleanup();
445                 }
446 #endif
447         }
448
449 #if !defined(VMS) || __VMS_VER >= 70000000
450
451 int BIO_socket_ioctl(int fd, long type, unsigned long *arg)
452         {
453         int i;
454
455         i=ioctlsocket(fd,type,arg);
456         if (i < 0)
457                 SYSerr(SYS_F_IOCTLSOCKET,get_last_socket_error());
458         return(i);
459         }
460 #endif /* __VMS_VER */
461
462 /* The reason I have implemented this instead of using sscanf is because
463  * Visual C 1.52c gives an unresolved external when linking a DLL :-( */
464 static int get_ip(const char *str, unsigned char ip[4])
465         {
466         unsigned int tmp[4];
467         int num=0,c,ok=0;
468
469         tmp[0]=tmp[1]=tmp[2]=tmp[3]=0;
470
471         for (;;)
472                 {
473                 c= *(str++);
474                 if ((c >= '0') && (c <= '9'))
475                         {
476                         ok=1;
477                         tmp[num]=tmp[num]*10+c-'0';
478                         if (tmp[num] > 255) return(-1);
479                         }
480                 else if (c == '.')
481                         {
482                         if (!ok) return(-1);
483                         if (num == 3) break;
484                         num++;
485                         ok=0;
486                         }
487                 else if ((num == 3) && ok)
488                         break;
489                 else
490                         return(0);
491                 }
492         ip[0]=tmp[0];
493         ip[1]=tmp[1];
494         ip[2]=tmp[2];
495         ip[3]=tmp[3];
496         return(1);
497         }
498
499 int BIO_get_accept_socket(char *host, int bind_mode)
500         {
501         int ret=0;
502         struct sockaddr_in server,client;
503         int s= -1,cs;
504         unsigned char ip[4];
505         unsigned short port;
506         char *str,*e;
507         const char *h,*p;
508         unsigned long l;
509         int err_num;
510
511         if (!BIO_sock_init()) return(INVALID_SOCKET);
512
513         if ((str=BUF_strdup(host)) == NULL) return(INVALID_SOCKET);
514
515         h=p=NULL;
516         h=str;
517         for (e=str; *e; e++)
518                 {
519                 if (*e == ':')
520                         {
521                         p= &(e[1]);
522                         *e='\0';
523                         }
524                 else if (*e == '/')
525                         {
526                         *e='\0';
527                         break;
528                         }
529                 }
530
531         if (p == NULL)
532                 {
533                 p=h;
534                 h="*";
535                 }
536
537         if (!BIO_get_port(p,&port)) return(INVALID_SOCKET);
538
539         memset((char *)&server,0,sizeof(server));
540         server.sin_family=AF_INET;
541         server.sin_port=htons(port);
542
543         if (strcmp(h,"*") == 0)
544                 server.sin_addr.s_addr=INADDR_ANY;
545         else
546                 {
547                 if (!BIO_get_host_ip(h,&(ip[0]))) return(INVALID_SOCKET);
548                 l=(unsigned long)
549                         ((unsigned long)ip[0]<<24L)|
550                         ((unsigned long)ip[1]<<16L)|
551                         ((unsigned long)ip[2]<< 8L)|
552                         ((unsigned long)ip[3]);
553                 server.sin_addr.s_addr=htonl(l);
554                 }
555
556 again:
557         s=socket(AF_INET,SOCK_STREAM,SOCKET_PROTOCOL);
558         if (s == INVALID_SOCKET)
559                 {
560                 SYSerr(SYS_F_SOCKET,get_last_socket_error());
561                 ERR_add_error_data(3,"port='",host,"'");
562                 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET,BIO_R_UNABLE_TO_CREATE_SOCKET);
563                 goto err;
564                 }
565
566 #ifdef SO_REUSEADDR
567         if (bind_mode == BIO_BIND_REUSEADDR)
568                 {
569                 int i=1;
570
571                 ret=setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&i,sizeof(i));
572                 bind_mode=BIO_BIND_NORMAL;
573                 }
574 #endif
575         if (bind(s,(struct sockaddr *)&server,sizeof(server)) == -1)
576                 {
577 #ifdef SO_REUSEADDR
578                 err_num=get_last_socket_error();
579                 if ((bind_mode == BIO_BIND_REUSEADDR_IF_UNUSED) &&
580                         (err_num == EADDRINUSE))
581                         {
582                         memcpy((char *)&client,(char *)&server,sizeof(server));
583                         if (strcmp(h,"*") == 0)
584                                 client.sin_addr.s_addr=htonl(0x7F000001);
585                         cs=socket(AF_INET,SOCK_STREAM,SOCKET_PROTOCOL);
586                         if (cs != INVALID_SOCKET)
587                                 {
588                                 int ii;
589                                 ii=connect(cs,(struct sockaddr *)&client,
590                                         sizeof(client));
591                                 closesocket(cs);
592                                 if (ii == INVALID_SOCKET)
593                                         {
594                                         bind_mode=BIO_BIND_REUSEADDR;
595                                         closesocket(s);
596                                         goto again;
597                                         }
598                                 /* else error */
599                                 }
600                         /* else error */
601                         }
602 #endif
603                 SYSerr(SYS_F_BIND,err_num);
604                 ERR_add_error_data(3,"port='",host,"'");
605                 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET,BIO_R_UNABLE_TO_BIND_SOCKET);
606                 goto err;
607                 }
608         if (listen(s,MAX_LISTEN) == -1)
609                 {
610                 SYSerr(SYS_F_BIND,get_last_socket_error());
611                 ERR_add_error_data(3,"port='",host,"'");
612                 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET,BIO_R_UNABLE_TO_LISTEN_SOCKET);
613                 goto err;
614                 }
615         ret=1;
616 err:
617         if (str != NULL) Free(str);
618         if ((ret == 0) && (s != INVALID_SOCKET))
619                 {
620                 closesocket(s);
621                 s= INVALID_SOCKET;
622                 }
623         return(s);
624         }
625
626 int BIO_accept(int sock, char **addr)
627         {
628         int ret=INVALID_SOCKET;
629         static struct sockaddr_in from;
630         unsigned long l;
631         unsigned short port;
632         int len;
633         char *p;
634
635         memset((char *)&from,0,sizeof(from));
636         len=sizeof(from);
637         /* Note: under VMS with SOCKETSHR the fourth parameter is currently
638          * of type (int *) whereas under other systems it is (void *) if
639          * you don't have a cast it will choke the compiler: if you do
640          * have a cast then you can either go for (int *) or (void *).
641          */
642         ret=accept(sock,(struct sockaddr *)&from,(void *)&len);
643         if (ret == INVALID_SOCKET)
644                 {
645                 SYSerr(SYS_F_ACCEPT,get_last_socket_error());
646                 BIOerr(BIO_F_BIO_ACCEPT,BIO_R_ACCEPT_ERROR);
647                 goto end;
648                 }
649
650         if (addr == NULL) goto end;
651
652         l=ntohl(from.sin_addr.s_addr);
653         port=ntohs(from.sin_port);
654         if (*addr == NULL)
655                 {
656                 if ((p=Malloc(24)) == NULL)
657                         {
658                         BIOerr(BIO_F_BIO_ACCEPT,ERR_R_MALLOC_FAILURE);
659                         goto end;
660                         }
661                 *addr=p;
662                 }
663         sprintf(*addr,"%d.%d.%d.%d:%d",
664                 (unsigned char)(l>>24L)&0xff,
665                 (unsigned char)(l>>16L)&0xff,
666                 (unsigned char)(l>> 8L)&0xff,
667                 (unsigned char)(l     )&0xff,
668                 port);
669 end:
670         return(ret);
671         }
672
673 int BIO_set_tcp_ndelay(int s, int on)
674         {
675         int ret=0;
676 #if defined(TCP_NODELAY) && (defined(IPPROTO_TCP) || defined(SOL_TCP))
677         int opt;
678
679 #ifdef SOL_TCP
680         opt=SOL_TCP;
681 #else
682 #ifdef IPPROTO_TCP
683         opt=IPPROTO_TCP;
684 #endif
685 #endif
686         
687         ret=setsockopt(s,opt,TCP_NODELAY,(char *)&on,sizeof(on));
688 #endif
689         return(ret == 0);
690         }
691 #endif
692
693 int BIO_socket_nbio(int s, int mode)
694         {
695         int ret= -1;
696         unsigned long l;
697
698         l=mode;
699 #ifdef FIONBIO
700         ret=BIO_socket_ioctl(s,FIONBIO,&l);
701 #endif
702         return(ret == 0);
703         }