462dc2ff467f7bc2027ab6fbce3b4dc8b4c8d19b
[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 #include <stdio.h>
60 #include <stdlib.h>
61 #include <errno.h>
62 #define USE_SOCKETS
63 #include "cryptlib.h"
64 #include <openssl/bio.h>
65 #if defined(OPENSSL_SYS_NETWARE) && defined(NETWARE_BSDSOCK)
66 #include <netdb.h>
67 #if defined(NETWARE_CLIB)
68 #include <sys/ioctl.h>
69 NETDB_DEFINE_CONTEXT
70 #endif
71 #endif
72
73 #ifndef OPENSSL_NO_SOCK
74
75 #include <openssl/dso.h>
76
77 #define SOCKET_PROTOCOL IPPROTO_TCP
78
79 #ifdef SO_MAXCONN
80 #define MAX_LISTEN  SO_MAXCONN
81 #elif defined(SOMAXCONN)
82 #define MAX_LISTEN  SOMAXCONN
83 #else
84 #define MAX_LISTEN  32
85 #endif
86
87 #if defined(OPENSSL_SYS_WINDOWS) || (defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK))
88 static int wsa_init_done=0;
89 #endif
90
91 #if 0
92 static unsigned long BIO_ghbn_hits=0L;
93 static unsigned long BIO_ghbn_miss=0L;
94
95 #define GHBN_NUM        4
96 static struct ghbn_cache_st
97         {
98         char name[129];
99         struct hostent *ent;
100         unsigned long order;
101         } ghbn_cache[GHBN_NUM];
102 #endif
103
104 static int get_ip(const char *str,unsigned char *ip);
105 #if 0
106 static void ghbn_free(struct hostent *a);
107 static struct hostent *ghbn_dup(struct hostent *a);
108 #endif
109 int BIO_get_host_ip(const char *str, unsigned char *ip)
110         {
111         int i;
112         int err = 1;
113         int locked = 0;
114         struct hostent *he;
115
116         i=get_ip(str,ip);
117         if (i < 0)
118                 {
119                 BIOerr(BIO_F_BIO_GET_HOST_IP,BIO_R_INVALID_IP_ADDRESS);
120                 goto err;
121                 }
122
123         /* At this point, we have something that is most probably correct
124            in some way, so let's init the socket. */
125         if (BIO_sock_init() != 1)
126                 return 0; /* don't generate another error code here */
127
128         /* If the string actually contained an IP address, we need not do
129            anything more */
130         if (i > 0) return(1);
131
132         /* do a gethostbyname */
133         CRYPTO_w_lock(CRYPTO_LOCK_GETHOSTBYNAME);
134         locked = 1;
135         he=BIO_gethostbyname(str);
136         if (he == NULL)
137                 {
138                 BIOerr(BIO_F_BIO_GET_HOST_IP,BIO_R_BAD_HOSTNAME_LOOKUP);
139                 goto err;
140                 }
141
142         /* cast to short because of win16 winsock definition */
143         if ((short)he->h_addrtype != AF_INET)
144                 {
145                 BIOerr(BIO_F_BIO_GET_HOST_IP,BIO_R_GETHOSTBYNAME_ADDR_IS_NOT_AF_INET);
146                 goto err;
147                 }
148         for (i=0; i<4; i++)
149                 ip[i]=he->h_addr_list[0][i];
150         err = 0;
151
152  err:
153         if (locked)
154                 CRYPTO_w_unlock(CRYPTO_LOCK_GETHOSTBYNAME);
155         if (err)
156                 {
157                 ERR_add_error_data(2,"host=",str);
158                 return 0;
159                 }
160         else
161                 return 1;
162         }
163
164 int BIO_get_port(const char *str, unsigned short *port_ptr)
165         {
166         int i;
167         struct servent *s;
168
169         if (str == NULL)
170                 {
171                 BIOerr(BIO_F_BIO_GET_PORT,BIO_R_NO_PORT_DEFINED);
172                 return(0);
173                 }
174         i=atoi(str);
175         if (i != 0)
176                 *port_ptr=(unsigned short)i;
177         else
178                 {
179                 CRYPTO_w_lock(CRYPTO_LOCK_GETSERVBYNAME);
180                 /* Note: under VMS with SOCKETSHR, it seems like the first
181                  * parameter is 'char *', instead of 'const char *'
182                  */
183 #ifndef CONST_STRICT
184                 s=getservbyname((char *)str,"tcp");
185 #else
186                 s=getservbyname(str,"tcp");
187 #endif
188                 if(s != NULL)
189                         *port_ptr=ntohs((unsigned short)s->s_port);
190                 CRYPTO_w_unlock(CRYPTO_LOCK_GETSERVBYNAME);
191                 if(s == NULL)
192                         {
193                         if (strcmp(str,"http") == 0)
194                                 *port_ptr=80;
195                         else if (strcmp(str,"telnet") == 0)
196                                 *port_ptr=23;
197                         else if (strcmp(str,"socks") == 0)
198                                 *port_ptr=1080;
199                         else if (strcmp(str,"https") == 0)
200                                 *port_ptr=443;
201                         else if (strcmp(str,"ssl") == 0)
202                                 *port_ptr=443;
203                         else if (strcmp(str,"ftp") == 0)
204                                 *port_ptr=21;
205                         else if (strcmp(str,"gopher") == 0)
206                                 *port_ptr=70;
207 #if 0
208                         else if (strcmp(str,"wais") == 0)
209                                 *port_ptr=21;
210 #endif
211                         else
212                                 {
213                                 SYSerr(SYS_F_GETSERVBYNAME,get_last_socket_error());
214                                 ERR_add_error_data(3,"service='",str,"'");
215                                 return(0);
216                                 }
217                         }
218                 }
219         return(1);
220         }
221
222 int BIO_sock_error(int sock)
223         {
224         int j,i;
225         int size;
226                  
227 #if defined(OPENSSL_SYS_BEOS_R5)
228         return 0;
229 #endif
230                  
231         size=sizeof(int);
232         /* Note: under Windows the third parameter is of type (char *)
233          * whereas under other systems it is (void *) if you don't have
234          * a cast it will choke the compiler: if you do have a cast then
235          * you can either go for (char *) or (void *).
236          */
237         i=getsockopt(sock,SOL_SOCKET,SO_ERROR,(void *)&j,(void *)&size);
238         if (i < 0)
239                 return(1);
240         else
241                 return(j);
242         }
243
244 #if 0
245 long BIO_ghbn_ctrl(int cmd, int iarg, char *parg)
246         {
247         int i;
248         char **p;
249
250         switch (cmd)
251                 {
252         case BIO_GHBN_CTRL_HITS:
253                 return(BIO_ghbn_hits);
254                 /* break; */
255         case BIO_GHBN_CTRL_MISSES:
256                 return(BIO_ghbn_miss);
257                 /* break; */
258         case BIO_GHBN_CTRL_CACHE_SIZE:
259                 return(GHBN_NUM);
260                 /* break; */
261         case BIO_GHBN_CTRL_GET_ENTRY:
262                 if ((iarg >= 0) && (iarg <GHBN_NUM) &&
263                         (ghbn_cache[iarg].order > 0))
264                         {
265                         p=(char **)parg;
266                         if (p == NULL) return(0);
267                         *p=ghbn_cache[iarg].name;
268                         ghbn_cache[iarg].name[128]='\0';
269                         return(1);
270                         }
271                 return(0);
272                 /* break; */
273         case BIO_GHBN_CTRL_FLUSH:
274                 for (i=0; i<GHBN_NUM; i++)
275                         ghbn_cache[i].order=0;
276                 break;
277         default:
278                 return(0);
279                 }
280         return(1);
281         }
282 #endif
283
284 #if 0
285 static struct hostent *ghbn_dup(struct hostent *a)
286         {
287         struct hostent *ret;
288         int i,j;
289
290         MemCheck_off();
291         ret=(struct hostent *)OPENSSL_malloc(sizeof(struct hostent));
292         if (ret == NULL) return(NULL);
293         memset(ret,0,sizeof(struct hostent));
294
295         for (i=0; a->h_aliases[i] != NULL; i++)
296                 ;
297         i++;
298         ret->h_aliases = (char **)OPENSSL_malloc(i*sizeof(char *));
299         if (ret->h_aliases == NULL)
300                 goto err;
301         memset(ret->h_aliases, 0, i*sizeof(char *));
302
303         for (i=0; a->h_addr_list[i] != NULL; i++)
304                 ;
305         i++;
306         ret->h_addr_list=(char **)OPENSSL_malloc(i*sizeof(char *));
307         if (ret->h_addr_list == NULL)
308                 goto err;
309         memset(ret->h_addr_list, 0, i*sizeof(char *));
310
311         j=strlen(a->h_name)+1;
312         if ((ret->h_name=OPENSSL_malloc(j)) == NULL) goto err;
313         memcpy((char *)ret->h_name,a->h_name,j);
314         for (i=0; a->h_aliases[i] != NULL; i++)
315                 {
316                 j=strlen(a->h_aliases[i])+1;
317                 if ((ret->h_aliases[i]=OPENSSL_malloc(j)) == NULL) goto err;
318                 memcpy(ret->h_aliases[i],a->h_aliases[i],j);
319                 }
320         ret->h_length=a->h_length;
321         ret->h_addrtype=a->h_addrtype;
322         for (i=0; a->h_addr_list[i] != NULL; i++)
323                 {
324                 if ((ret->h_addr_list[i]=OPENSSL_malloc(a->h_length)) == NULL)
325                         goto err;
326                 memcpy(ret->h_addr_list[i],a->h_addr_list[i],a->h_length);
327                 }
328         if (0)
329                 {
330 err:    
331                 if (ret != NULL)
332                         ghbn_free(ret);
333                 ret=NULL;
334                 }
335         MemCheck_on();
336         return(ret);
337         }
338
339 static void ghbn_free(struct hostent *a)
340         {
341         int i;
342
343         if(a == NULL)
344             return;
345
346         if (a->h_aliases != NULL)
347                 {
348                 for (i=0; a->h_aliases[i] != NULL; i++)
349                         OPENSSL_free(a->h_aliases[i]);
350                 OPENSSL_free(a->h_aliases);
351                 }
352         if (a->h_addr_list != NULL)
353                 {
354                 for (i=0; a->h_addr_list[i] != NULL; i++)
355                         OPENSSL_free(a->h_addr_list[i]);
356                 OPENSSL_free(a->h_addr_list);
357                 }
358         if (a->h_name != NULL) OPENSSL_free(a->h_name);
359         OPENSSL_free(a);
360         }
361
362 #endif
363
364 struct hostent *BIO_gethostbyname(const char *name)
365         {
366 #if 1
367         /* Caching gethostbyname() results forever is wrong,
368          * so we have to let the true gethostbyname() worry about this */
369 #if (defined(NETWARE_BSDSOCK) && !defined(__NOVELL_LIBC__))
370         return gethostbyname((char*)name);
371 #else
372         return gethostbyname(name);
373 #endif
374 #else
375         struct hostent *ret;
376         int i,lowi=0,j;
377         unsigned long low= (unsigned long)-1;
378
379
380 #  if 0
381         /* It doesn't make sense to use locking here: The function interface
382          * is not thread-safe, because threads can never be sure when
383          * some other thread destroys the data they were given a pointer to.
384          */
385         CRYPTO_w_lock(CRYPTO_LOCK_GETHOSTBYNAME);
386 #  endif
387         j=strlen(name);
388         if (j < 128)
389                 {
390                 for (i=0; i<GHBN_NUM; i++)
391                         {
392                         if (low > ghbn_cache[i].order)
393                                 {
394                                 low=ghbn_cache[i].order;
395                                 lowi=i;
396                                 }
397                         if (ghbn_cache[i].order > 0)
398                                 {
399                                 if (strncmp(name,ghbn_cache[i].name,128) == 0)
400                                         break;
401                                 }
402                         }
403                 }
404         else
405                 i=GHBN_NUM;
406
407         if (i == GHBN_NUM) /* no hit*/
408                 {
409                 BIO_ghbn_miss++;
410                 /* Note: under VMS with SOCKETSHR, it seems like the first
411                  * parameter is 'char *', instead of 'const char *'
412                  */
413 #  ifndef CONST_STRICT
414                 ret=gethostbyname((char *)name);
415 #  else
416                 ret=gethostbyname(name);
417 #  endif
418
419                 if (ret == NULL)
420                         goto end;
421                 if (j > 128) /* too big to cache */
422                         {
423 #  if 0
424                         /* If we were trying to make this function thread-safe (which
425                          * is bound to fail), we'd have to give up in this case
426                          * (or allocate more memory). */
427                         ret = NULL;
428 #  endif
429                         goto end;
430                         }
431
432                 /* else add to cache */
433                 if (ghbn_cache[lowi].ent != NULL)
434                         ghbn_free(ghbn_cache[lowi].ent); /* XXX not thread-safe */
435                 ghbn_cache[lowi].name[0] = '\0';
436
437                 if((ret=ghbn_cache[lowi].ent=ghbn_dup(ret)) == NULL)
438                         {
439                         BIOerr(BIO_F_BIO_GETHOSTBYNAME,ERR_R_MALLOC_FAILURE);
440                         goto end;
441                         }
442                 strncpy(ghbn_cache[lowi].name,name,128);
443                 ghbn_cache[lowi].order=BIO_ghbn_miss+BIO_ghbn_hits;
444                 }
445         else
446                 {
447                 BIO_ghbn_hits++;
448                 ret= ghbn_cache[i].ent;
449                 ghbn_cache[i].order=BIO_ghbn_miss+BIO_ghbn_hits;
450                 }
451 end:
452 #  if 0
453         CRYPTO_w_unlock(CRYPTO_LOCK_GETHOSTBYNAME);
454 #  endif
455         return(ret);
456 #endif
457         }
458
459
460 int BIO_sock_init(void)
461         {
462 #ifdef OPENSSL_SYS_WINDOWS
463         static struct WSAData wsa_state;
464
465         if (!wsa_init_done)
466                 {
467                 int err;
468           
469                 wsa_init_done=1;
470                 memset(&wsa_state,0,sizeof(wsa_state));
471                 /* Not making wsa_state available to the rest of the
472                  * code is formally wrong. But the structures we use
473                  * are [beleived to be] invariable among Winsock DLLs,
474                  * while API availability is [expected to be] probed
475                  * at run-time with DSO_global_lookup. */
476                 if (WSAStartup(0x0202,&wsa_state)!=0)
477                         {
478                         err=WSAGetLastError();
479                         SYSerr(SYS_F_WSASTARTUP,err);
480                         BIOerr(BIO_F_BIO_SOCK_INIT,BIO_R_WSASTARTUP);
481                         return(-1);
482                         }
483                 }
484 #endif /* OPENSSL_SYS_WINDOWS */
485 #ifdef WATT32
486         extern int _watt_do_exit;
487         _watt_do_exit = 0;    /* don't make sock_init() call exit() */
488         if (sock_init())
489                 return (-1);
490 #endif
491
492 #if defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK)
493     WORD wVerReq;
494     WSADATA wsaData;
495     int err;
496
497     if (!wsa_init_done)
498     {
499         wsa_init_done=1;
500         wVerReq = MAKEWORD( 2, 0 );
501         err = WSAStartup(wVerReq,&wsaData);
502         if (err != 0)
503         {
504             SYSerr(SYS_F_WSASTARTUP,err);
505             BIOerr(BIO_F_BIO_SOCK_INIT,BIO_R_WSASTARTUP);
506             return(-1);
507                         }
508                 }
509 #endif
510
511         return(1);
512         }
513
514 void BIO_sock_cleanup(void)
515         {
516 #ifdef OPENSSL_SYS_WINDOWS
517         if (wsa_init_done)
518                 {
519                 wsa_init_done=0;
520 #if 0           /* this call is claimed to be non-present in Winsock2 */
521                 WSACancelBlockingCall();
522 #endif
523                 WSACleanup();
524                 }
525 #elif defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK)
526    if (wsa_init_done)
527         {
528         wsa_init_done=0;
529         WSACleanup();
530                 }
531 #endif
532         }
533
534 #if !defined(OPENSSL_SYS_VMS) || __VMS_VER >= 70000000
535
536 int BIO_socket_ioctl(int fd, long type, void *arg)
537         {
538         int i;
539
540 #ifdef __DJGPP__
541         i=ioctlsocket(fd,type,(char *)arg);
542 #else
543         i=ioctlsocket(fd,type,arg);
544 #endif /* __DJGPP__ */
545         if (i < 0)
546                 SYSerr(SYS_F_IOCTLSOCKET,get_last_socket_error());
547         return(i);
548         }
549 #endif /* __VMS_VER */
550
551 /* The reason I have implemented this instead of using sscanf is because
552  * Visual C 1.52c gives an unresolved external when linking a DLL :-( */
553 static int get_ip(const char *str, unsigned char ip[4])
554         {
555         unsigned int tmp[4];
556         int num=0,c,ok=0;
557
558         tmp[0]=tmp[1]=tmp[2]=tmp[3]=0;
559
560         for (;;)
561                 {
562                 c= *(str++);
563                 if ((c >= '0') && (c <= '9'))
564                         {
565                         ok=1;
566                         tmp[num]=tmp[num]*10+c-'0';
567                         if (tmp[num] > 255) return(0);
568                         }
569                 else if (c == '.')
570                         {
571                         if (!ok) return(-1);
572                         if (num == 3) return(0);
573                         num++;
574                         ok=0;
575                         }
576                 else if (c == '\0' && (num == 3) && ok)
577                         break;
578                 else
579                         return(0);
580                 }
581         ip[0]=tmp[0];
582         ip[1]=tmp[1];
583         ip[2]=tmp[2];
584         ip[3]=tmp[3];
585         return(1);
586         }
587
588 int BIO_get_accept_socket(char *host, int bind_mode)
589         {
590         int ret=0;
591         struct sockaddr server,client;
592         struct sockaddr_in *sa_in;
593         int s=INVALID_SOCKET,cs;
594         unsigned char ip[4];
595         unsigned short port;
596         char *str=NULL,*e;
597         char *h,*p;
598         unsigned long l;
599         int err_num;
600
601         if (BIO_sock_init() != 1) return(INVALID_SOCKET);
602
603         if ((str=BUF_strdup(host)) == NULL) return(INVALID_SOCKET);
604
605         h=p=NULL;
606         h=str;
607         for (e=str; *e; e++)
608                 {
609                 if (*e == ':')
610                         {
611                         p=e;
612                         }
613                 else if (*e == '/')
614                         {
615                         *e='\0';
616                         break;
617                         }
618                 }
619         if (p)  *p++='\0';      /* points at last ':', '::port' is special [see below] */
620         else    p=h,h=NULL;
621
622 #ifdef EAI_FAMILY
623         do {
624         static union {  void *p;
625                         int (*f)(const char *,const char *,
626                                  const struct addrinfo *,
627                                  struct addrinfo **);
628                         } p_getaddrinfo = {NULL};
629         static union {  void *p;
630                         void (*f)(struct addrinfo *);
631                         } p_freeaddrinfo = {NULL};
632         struct addrinfo *res,hint;
633
634         if (p_getaddrinfo.p==NULL)
635                 {
636                 if ((p_getaddrinfo.p=DSO_global_lookup("getaddrinfo"))==NULL ||
637                     (p_freeaddrinfo.p=DSO_global_lookup("freeaddrinfo"))==NULL)
638                         p_getaddrinfo.p=(void*)-1;
639                 }
640         if (p_getaddrinfo.p==(void *)-1) break;
641
642         /* '::port' enforces IPv6 wildcard listener. Some OSes,
643          * e.g. Solaris, default to IPv6 without any hint. Also
644          * note that commonly IPv6 wildchard socket can service
645          * IPv4 connections just as well...  */
646         memset(&hint,0,sizeof(hint));
647         if (h)
648                 {
649                 if (strchr(h,':'))
650                         {
651                         if (h[1]=='\0') h=NULL;
652 #if OPENSSL_USE_IPV6
653                         hint.ai_family = AF_INET6;
654 #else
655                         h=NULL;
656 #endif
657                         }
658                 else if (h[0]=='*' && h[1]=='\0')
659                         h=NULL;
660                 }
661
662         if ((*p_getaddrinfo.f)(h,p,&hint,&res)) break;
663         server = *res->ai_addr;
664         (*p_freeaddrinfo.f)(res);
665         goto again;
666         } while (0);
667 #endif
668
669         if (!BIO_get_port(p,&port)) goto err;
670
671         memset((char *)&server,0,sizeof(server));
672         sa_in = (struct sockaddr_in *)&server;
673         sa_in->sin_family=AF_INET;
674         sa_in->sin_port=htons(port);
675
676         if (h == NULL || strcmp(h,"*") == 0)
677                 sa_in->sin_addr.s_addr=INADDR_ANY;
678         else
679                 {
680                 if (!BIO_get_host_ip(h,&(ip[0]))) goto err;
681                 l=(unsigned long)
682                         ((unsigned long)ip[0]<<24L)|
683                         ((unsigned long)ip[1]<<16L)|
684                         ((unsigned long)ip[2]<< 8L)|
685                         ((unsigned long)ip[3]);
686                 sa_in->sin_addr.s_addr=htonl(l);
687                 }
688
689 again:
690         s=socket(server.sa_family,SOCK_STREAM,SOCKET_PROTOCOL);
691         if (s == INVALID_SOCKET)
692                 {
693                 SYSerr(SYS_F_SOCKET,get_last_socket_error());
694                 ERR_add_error_data(3,"port='",host,"'");
695                 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET,BIO_R_UNABLE_TO_CREATE_SOCKET);
696                 goto err;
697                 }
698
699 #ifdef SO_REUSEADDR
700         if (bind_mode == BIO_BIND_REUSEADDR)
701                 {
702                 int i=1;
703
704                 ret=setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&i,sizeof(i));
705                 bind_mode=BIO_BIND_NORMAL;
706                 }
707 #endif
708         if (bind(s,&server,sizeof(server)) == -1)
709                 {
710 #ifdef SO_REUSEADDR
711                 err_num=get_last_socket_error();
712                 if ((bind_mode == BIO_BIND_REUSEADDR_IF_UNUSED) &&
713                         (err_num == EADDRINUSE))
714                         {
715                         client = server;
716                         if (h == NULL || strcmp(h,"*") == 0)
717                                 {
718 #if OPENSSL_USE_IPV6
719                                 if (client.sa_family == AF_INET6)
720                                         {
721                                         struct sockaddr_in6 *sin6 =
722                                                 (struct sockaddr_in6 *)&client;
723                                         memset(&sin6->sin6_addr,0,sizeof(sin6->sin6_addr));
724                                         sin6->sin6_addr.s6_addr[15]=1;
725                                         }
726                                 else
727 #endif
728                                 if (client.sa_family == AF_INET)
729                                         {
730                                         struct sockaddr_in *sin4 =
731                                                 (struct sockaddr_in *)&client;
732                                         sin4->sin_addr.s_addr=htonl(0x7F000001);
733                                         }
734                                 else    goto err;
735                                 }
736                         cs=socket(client.sa_family,SOCK_STREAM,SOCKET_PROTOCOL);
737                         if (cs != INVALID_SOCKET)
738                                 {
739                                 int ii;
740                                 ii=connect(cs,(struct sockaddr *)&client,
741                                         sizeof(client));
742                                 closesocket(cs);
743                                 if (ii == INVALID_SOCKET)
744                                         {
745                                         bind_mode=BIO_BIND_REUSEADDR;
746                                         closesocket(s);
747                                         goto again;
748                                         }
749                                 /* else error */
750                                 }
751                         /* else error */
752                         }
753 #endif
754                 SYSerr(SYS_F_BIND,err_num);
755                 ERR_add_error_data(3,"port='",host,"'");
756                 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET,BIO_R_UNABLE_TO_BIND_SOCKET);
757                 goto err;
758                 }
759         if (listen(s,MAX_LISTEN) == -1)
760                 {
761                 SYSerr(SYS_F_BIND,get_last_socket_error());
762                 ERR_add_error_data(3,"port='",host,"'");
763                 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET,BIO_R_UNABLE_TO_LISTEN_SOCKET);
764                 goto err;
765                 }
766         ret=1;
767 err:
768         if (str != NULL) OPENSSL_free(str);
769         if ((ret == 0) && (s != INVALID_SOCKET))
770                 {
771                 closesocket(s);
772                 s= INVALID_SOCKET;
773                 }
774         return(s);
775         }
776
777 int BIO_accept(int sock, char **addr)
778         {
779         int ret=INVALID_SOCKET;
780         struct sockaddr from;
781         struct sockaddr_in *sa_in;
782         unsigned long l;
783         unsigned short port;
784         int len;
785         char *p;
786
787         memset(&from,0,sizeof(from));
788         len=sizeof(from);
789         /* Note: under VMS with SOCKETSHR the fourth parameter is currently
790          * of type (int *) whereas under other systems it is (void *) if
791          * you don't have a cast it will choke the compiler: if you do
792          * have a cast then you can either go for (int *) or (void *).
793          */
794         ret=accept(sock,&from,(void *)&len);
795         if (ret == INVALID_SOCKET)
796                 {
797                 if(BIO_sock_should_retry(ret)) return -2;
798                 SYSerr(SYS_F_ACCEPT,get_last_socket_error());
799                 BIOerr(BIO_F_BIO_ACCEPT,BIO_R_ACCEPT_ERROR);
800                 goto end;
801                 }
802
803         if (addr == NULL) goto end;
804
805 #ifdef EAI_FAMILY
806         do {
807         char   h[NI_MAXHOST],s[NI_MAXSERV];
808         size_t nl;
809         static union {  void *p;
810                         int (*f)(const struct sockaddr *,size_t/*socklen_t*/,
811                                  char *,size_t,char *,size_t,int);
812                         } p_getnameinfo = {NULL};
813                         /* 2nd argument to getnameinfo is specified to
814                          * be socklen_t. Unfortunately there is a number
815                          * of environments where socklen_t is not defined.
816                          * As it's passed by value, it's safe to pass it
817                          * as size_t... <appro> */
818
819         if (p_getnameinfo.p==NULL)
820                 {
821                 if ((p_getnameinfo.p=DSO_global_lookup("getnameinfo"))==NULL)
822                         p_getnameinfo.p=(void*)-1;
823                 }
824         if (p_getnameinfo.p==(void *)-1) break;
825
826         if ((*p_getnameinfo.f)(&from,sizeof(from),h,sizeof(h),s,sizeof(s),
827             NI_NUMERICHOST|NI_NUMERICSERV)) break;
828         nl = strlen(h)+strlen(s)+2; if (len<24) len=24;
829         p = *addr;
830         if (p)  { *p = '\0'; p = OPENSSL_realloc(p,nl); }
831         else    { p = OPENSSL_malloc(nl);               }
832         if (p==NULL)
833                 {
834                 BIOerr(BIO_F_BIO_ACCEPT,ERR_R_MALLOC_FAILURE);
835                 goto end;
836                 }
837         *addr = p;
838         BIO_snprintf(*addr,nl,"%s:%s",h,s);
839         goto end;
840         } while(0);
841 #endif
842         if (from.sa_family != AF_INET) goto end;
843         sa_in = (struct sockaddr_in *)&from;
844         l=ntohl(sa_in->sin_addr.s_addr);
845         port=ntohs(sa_in->sin_port);
846         if (*addr == NULL)
847                 {
848                 if ((p=OPENSSL_malloc(24)) == NULL)
849                         {
850                         BIOerr(BIO_F_BIO_ACCEPT,ERR_R_MALLOC_FAILURE);
851                         goto end;
852                         }
853                 *addr=p;
854                 }
855         BIO_snprintf(*addr,24,"%d.%d.%d.%d:%d",
856                      (unsigned char)(l>>24L)&0xff,
857                      (unsigned char)(l>>16L)&0xff,
858                      (unsigned char)(l>> 8L)&0xff,
859                      (unsigned char)(l     )&0xff,
860                      port);
861 end:
862         return(ret);
863         }
864
865 int BIO_set_tcp_ndelay(int s, int on)
866         {
867         int ret=0;
868 #if defined(TCP_NODELAY) && (defined(IPPROTO_TCP) || defined(SOL_TCP))
869         int opt;
870
871 #ifdef SOL_TCP
872         opt=SOL_TCP;
873 #else
874 #ifdef IPPROTO_TCP
875         opt=IPPROTO_TCP;
876 #endif
877 #endif
878         
879         ret=setsockopt(s,opt,TCP_NODELAY,(char *)&on,sizeof(on));
880 #endif
881         return(ret == 0);
882         }
883 #endif
884
885 int BIO_socket_nbio(int s, int mode)
886         {
887         int ret= -1;
888         int l;
889
890         l=mode;
891 #ifdef FIONBIO
892         ret=BIO_socket_ioctl(s,FIONBIO,&l);
893 #endif
894         return(ret == 0);
895         }