f13d2ac4b9346b4df4f68068e7457bfbc8cfdc1a
[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 /*
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         union { size_t s; int i; } size;
237                  
238         /* heuristic way to adapt for platforms that expect 64-bit optlen */
239         size.s=0, size.i=sizeof(j);
240         /* Note: under Windows the third parameter is of type (char *)
241          * whereas under other systems it is (void *) if you don't have
242          * a cast it will choke the compiler: if you do have a cast then
243          * you can either go for (char *) or (void *).
244          */
245         i=getsockopt(sock,SOL_SOCKET,SO_ERROR,(void *)&j,(void *)&size);
246         if (i < 0)
247                 return(1);
248         else
249                 return(j);
250         }
251
252 #if 0
253 long BIO_ghbn_ctrl(int cmd, int iarg, char *parg)
254         {
255         int i;
256         char **p;
257
258         switch (cmd)
259                 {
260         case BIO_GHBN_CTRL_HITS:
261                 return(BIO_ghbn_hits);
262                 /* break; */
263         case BIO_GHBN_CTRL_MISSES:
264                 return(BIO_ghbn_miss);
265                 /* break; */
266         case BIO_GHBN_CTRL_CACHE_SIZE:
267                 return(GHBN_NUM);
268                 /* break; */
269         case BIO_GHBN_CTRL_GET_ENTRY:
270                 if ((iarg >= 0) && (iarg <GHBN_NUM) &&
271                         (ghbn_cache[iarg].order > 0))
272                         {
273                         p=(char **)parg;
274                         if (p == NULL) return(0);
275                         *p=ghbn_cache[iarg].name;
276                         ghbn_cache[iarg].name[128]='\0';
277                         return(1);
278                         }
279                 return(0);
280                 /* break; */
281         case BIO_GHBN_CTRL_FLUSH:
282                 for (i=0; i<GHBN_NUM; i++)
283                         ghbn_cache[i].order=0;
284                 break;
285         default:
286                 return(0);
287                 }
288         return(1);
289         }
290 #endif
291
292 #if 0
293 static struct hostent *ghbn_dup(struct hostent *a)
294         {
295         struct hostent *ret;
296         int i,j;
297
298         MemCheck_off();
299         ret=(struct hostent *)OPENSSL_malloc(sizeof(struct hostent));
300         if (ret == NULL) return(NULL);
301         memset(ret,0,sizeof(struct hostent));
302
303         for (i=0; a->h_aliases[i] != NULL; i++)
304                 ;
305         i++;
306         ret->h_aliases = (char **)OPENSSL_malloc(i*sizeof(char *));
307         if (ret->h_aliases == NULL)
308                 goto err;
309         memset(ret->h_aliases, 0, i*sizeof(char *));
310
311         for (i=0; a->h_addr_list[i] != NULL; i++)
312                 ;
313         i++;
314         ret->h_addr_list=(char **)OPENSSL_malloc(i*sizeof(char *));
315         if (ret->h_addr_list == NULL)
316                 goto err;
317         memset(ret->h_addr_list, 0, i*sizeof(char *));
318
319         j=strlen(a->h_name)+1;
320         if ((ret->h_name=OPENSSL_malloc(j)) == NULL) goto err;
321         memcpy((char *)ret->h_name,a->h_name,j);
322         for (i=0; a->h_aliases[i] != NULL; i++)
323                 {
324                 j=strlen(a->h_aliases[i])+1;
325                 if ((ret->h_aliases[i]=OPENSSL_malloc(j)) == NULL) goto err;
326                 memcpy(ret->h_aliases[i],a->h_aliases[i],j);
327                 }
328         ret->h_length=a->h_length;
329         ret->h_addrtype=a->h_addrtype;
330         for (i=0; a->h_addr_list[i] != NULL; i++)
331                 {
332                 if ((ret->h_addr_list[i]=OPENSSL_malloc(a->h_length)) == NULL)
333                         goto err;
334                 memcpy(ret->h_addr_list[i],a->h_addr_list[i],a->h_length);
335                 }
336         if (0)
337                 {
338 err:    
339                 if (ret != NULL)
340                         ghbn_free(ret);
341                 ret=NULL;
342                 }
343         MemCheck_on();
344         return(ret);
345         }
346
347 static void ghbn_free(struct hostent *a)
348         {
349         int i;
350
351         if(a == NULL)
352             return;
353
354         if (a->h_aliases != NULL)
355                 {
356                 for (i=0; a->h_aliases[i] != NULL; i++)
357                         OPENSSL_free(a->h_aliases[i]);
358                 OPENSSL_free(a->h_aliases);
359                 }
360         if (a->h_addr_list != NULL)
361                 {
362                 for (i=0; a->h_addr_list[i] != NULL; i++)
363                         OPENSSL_free(a->h_addr_list[i]);
364                 OPENSSL_free(a->h_addr_list);
365                 }
366         if (a->h_name != NULL) OPENSSL_free(a->h_name);
367         OPENSSL_free(a);
368         }
369
370 #endif
371
372 struct hostent *BIO_gethostbyname(const char *name)
373         {
374 #if 1
375         /* Caching gethostbyname() results forever is wrong,
376          * so we have to let the true gethostbyname() worry about this */
377 #if (defined(NETWARE_BSDSOCK) && !defined(__NOVELL_LIBC__))
378         return gethostbyname((char*)name);
379 #else
380         return gethostbyname(name);
381 #endif
382 #else
383         struct hostent *ret;
384         int i,lowi=0,j;
385         unsigned long low= (unsigned long)-1;
386
387
388 #  if 0
389         /* It doesn't make sense to use locking here: The function interface
390          * is not thread-safe, because threads can never be sure when
391          * some other thread destroys the data they were given a pointer to.
392          */
393         CRYPTO_w_lock(CRYPTO_LOCK_GETHOSTBYNAME);
394 #  endif
395         j=strlen(name);
396         if (j < 128)
397                 {
398                 for (i=0; i<GHBN_NUM; i++)
399                         {
400                         if (low > ghbn_cache[i].order)
401                                 {
402                                 low=ghbn_cache[i].order;
403                                 lowi=i;
404                                 }
405                         if (ghbn_cache[i].order > 0)
406                                 {
407                                 if (strncmp(name,ghbn_cache[i].name,128) == 0)
408                                         break;
409                                 }
410                         }
411                 }
412         else
413                 i=GHBN_NUM;
414
415         if (i == GHBN_NUM) /* no hit*/
416                 {
417                 BIO_ghbn_miss++;
418                 /* Note: under VMS with SOCKETSHR, it seems like the first
419                  * parameter is 'char *', instead of 'const char *'
420                  */
421 #  ifndef CONST_STRICT
422                 ret=gethostbyname((char *)name);
423 #  else
424                 ret=gethostbyname(name);
425 #  endif
426
427                 if (ret == NULL)
428                         goto end;
429                 if (j > 128) /* too big to cache */
430                         {
431 #  if 0
432                         /* If we were trying to make this function thread-safe (which
433                          * is bound to fail), we'd have to give up in this case
434                          * (or allocate more memory). */
435                         ret = NULL;
436 #  endif
437                         goto end;
438                         }
439
440                 /* else add to cache */
441                 if (ghbn_cache[lowi].ent != NULL)
442                         ghbn_free(ghbn_cache[lowi].ent); /* XXX not thread-safe */
443                 ghbn_cache[lowi].name[0] = '\0';
444
445                 if((ret=ghbn_cache[lowi].ent=ghbn_dup(ret)) == NULL)
446                         {
447                         BIOerr(BIO_F_BIO_GETHOSTBYNAME,ERR_R_MALLOC_FAILURE);
448                         goto end;
449                         }
450                 strncpy(ghbn_cache[lowi].name,name,128);
451                 ghbn_cache[lowi].order=BIO_ghbn_miss+BIO_ghbn_hits;
452                 }
453         else
454                 {
455                 BIO_ghbn_hits++;
456                 ret= ghbn_cache[i].ent;
457                 ghbn_cache[i].order=BIO_ghbn_miss+BIO_ghbn_hits;
458                 }
459 end:
460 #  if 0
461         CRYPTO_w_unlock(CRYPTO_LOCK_GETHOSTBYNAME);
462 #  endif
463         return(ret);
464 #endif
465         }
466
467
468 int BIO_sock_init(void)
469         {
470 #ifdef OPENSSL_SYS_WINDOWS
471         static struct WSAData wsa_state;
472
473         if (!wsa_init_done)
474                 {
475                 int err;
476           
477                 wsa_init_done=1;
478                 memset(&wsa_state,0,sizeof(wsa_state));
479                 /* Not making wsa_state available to the rest of the
480                  * code is formally wrong. But the structures we use
481                  * are [beleived to be] invariable among Winsock DLLs,
482                  * while API availability is [expected to be] probed
483                  * at run-time with DSO_global_lookup. */
484                 if (WSAStartup(0x0202,&wsa_state)!=0)
485                         {
486                         err=WSAGetLastError();
487                         SYSerr(SYS_F_WSASTARTUP,err);
488                         BIOerr(BIO_F_BIO_SOCK_INIT,BIO_R_WSASTARTUP);
489                         return(-1);
490                         }
491                 }
492 #endif /* OPENSSL_SYS_WINDOWS */
493 #ifdef WATT32
494         extern int _watt_do_exit;
495         _watt_do_exit = 0;    /* don't make sock_init() call exit() */
496         if (sock_init())
497                 return (-1);
498 #endif
499
500 #if defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK)
501     WORD wVerReq;
502     WSADATA wsaData;
503     int err;
504
505     if (!wsa_init_done)
506     {
507         wsa_init_done=1;
508         wVerReq = MAKEWORD( 2, 0 );
509         err = WSAStartup(wVerReq,&wsaData);
510         if (err != 0)
511         {
512             SYSerr(SYS_F_WSASTARTUP,err);
513             BIOerr(BIO_F_BIO_SOCK_INIT,BIO_R_WSASTARTUP);
514             return(-1);
515                         }
516                 }
517 #endif
518
519         return(1);
520         }
521
522 void BIO_sock_cleanup(void)
523         {
524 #ifdef OPENSSL_SYS_WINDOWS
525         if (wsa_init_done)
526                 {
527                 wsa_init_done=0;
528 #if 0           /* this call is claimed to be non-present in Winsock2 */
529                 WSACancelBlockingCall();
530 #endif
531                 WSACleanup();
532                 }
533 #elif defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK)
534    if (wsa_init_done)
535         {
536         wsa_init_done=0;
537         WSACleanup();
538                 }
539 #endif
540         }
541
542 #if !defined(OPENSSL_SYS_VMS) || __VMS_VER >= 70000000
543
544 int BIO_socket_ioctl(int fd, long type, void *arg)
545         {
546         int i;
547
548 #ifdef __DJGPP__
549         i=ioctlsocket(fd,type,(char *)arg);
550 #else
551 # if defined(OPENSSL_SYS_VMS)
552         /*-
553          * 2011-02-18 SMS.
554          * VMS ioctl() can't tolerate a 64-bit "void *arg", but we
555          * observe that all the consumers pass in an "unsigned long *",
556          * so we arrange a local copy with a short pointer, and use
557          * that, instead.
558          */
559 #  if __INITIAL_POINTER_SIZE == 64
560 #   define ARG arg_32p
561 #   pragma pointer_size save
562 #   pragma pointer_size 32
563         unsigned long arg_32;
564         unsigned long *arg_32p;
565 #   pragma pointer_size restore
566         arg_32p = &arg_32;
567         arg_32 = *((unsigned long *) arg);
568 #  else /* __INITIAL_POINTER_SIZE == 64 */
569 #   define ARG arg
570 #  endif /* __INITIAL_POINTER_SIZE == 64 [else] */
571 # else /* defined(OPENSSL_SYS_VMS) */
572 #  define ARG arg
573 # endif /* defined(OPENSSL_SYS_VMS) [else] */
574
575         i=ioctlsocket(fd,type,ARG);
576 #endif /* __DJGPP__ */
577         if (i < 0)
578                 SYSerr(SYS_F_IOCTLSOCKET,get_last_socket_error());
579         return(i);
580         }
581 #endif /* __VMS_VER */
582
583 /* The reason I have implemented this instead of using sscanf is because
584  * Visual C 1.52c gives an unresolved external when linking a DLL :-( */
585 static int get_ip(const char *str, unsigned char ip[4])
586         {
587         unsigned int tmp[4];
588         int num=0,c,ok=0;
589
590         tmp[0]=tmp[1]=tmp[2]=tmp[3]=0;
591
592         for (;;)
593                 {
594                 c= *(str++);
595                 if ((c >= '0') && (c <= '9'))
596                         {
597                         ok=1;
598                         tmp[num]=tmp[num]*10+c-'0';
599                         if (tmp[num] > 255) return(0);
600                         }
601                 else if (c == '.')
602                         {
603                         if (!ok) return(-1);
604                         if (num == 3) return(0);
605                         num++;
606                         ok=0;
607                         }
608                 else if (c == '\0' && (num == 3) && ok)
609                         break;
610                 else
611                         return(0);
612                 }
613         ip[0]=tmp[0];
614         ip[1]=tmp[1];
615         ip[2]=tmp[2];
616         ip[3]=tmp[3];
617         return(1);
618         }
619
620 int BIO_get_accept_socket(char *host, int bind_mode)
621         {
622         int ret=0;
623         union {
624                 struct sockaddr sa;
625                 struct sockaddr_in sa_in;
626 #if OPENSSL_USE_IPV6
627                 struct sockaddr_in6 sa_in6;
628 #endif
629         } server,client;
630         int s=INVALID_SOCKET,cs,addrlen;
631         unsigned char ip[4];
632         unsigned short port;
633         char *str=NULL,*e;
634         char *h,*p;
635         unsigned long l;
636         int err_num;
637
638         if (BIO_sock_init() != 1) return(INVALID_SOCKET);
639
640         if ((str=BUF_strdup(host)) == NULL) return(INVALID_SOCKET);
641
642         h=p=NULL;
643         h=str;
644         for (e=str; *e; e++)
645                 {
646                 if (*e == ':')
647                         {
648                         p=e;
649                         }
650                 else if (*e == '/')
651                         {
652                         *e='\0';
653                         break;
654                         }
655                 }
656         if (p)  *p++='\0';      /* points at last ':', '::port' is special [see below] */
657         else    p=h,h=NULL;
658
659 #ifdef EAI_FAMILY
660         do {
661         static union {  void *p;
662                         int (WSAAPI *f)(const char *,const char *,
663                                  const struct addrinfo *,
664                                  struct addrinfo **);
665                         } p_getaddrinfo = {NULL};
666         static union {  void *p;
667                         void (WSAAPI *f)(struct addrinfo *);
668                         } p_freeaddrinfo = {NULL};
669         struct addrinfo *res,hint;
670
671         if (p_getaddrinfo.p==NULL)
672                 {
673                 if ((p_getaddrinfo.p=DSO_global_lookup("getaddrinfo"))==NULL ||
674                     (p_freeaddrinfo.p=DSO_global_lookup("freeaddrinfo"))==NULL)
675                         p_getaddrinfo.p=(void*)-1;
676                 }
677         if (p_getaddrinfo.p==(void *)-1) break;
678
679         /* '::port' enforces IPv6 wildcard listener. Some OSes,
680          * e.g. Solaris, default to IPv6 without any hint. Also
681          * note that commonly IPv6 wildchard socket can service
682          * IPv4 connections just as well...  */
683         memset(&hint,0,sizeof(hint));
684         hint.ai_flags = AI_PASSIVE;
685         if (h)
686                 {
687                 if (strchr(h,':'))
688                         {
689                         if (h[1]=='\0') h=NULL;
690 #if OPENSSL_USE_IPV6
691                         hint.ai_family = AF_INET6;
692 #else
693                         h=NULL;
694 #endif
695                         }
696                 else if (h[0]=='*' && h[1]=='\0')
697                         {
698                         hint.ai_family = AF_INET;
699                         h=NULL;
700                         }
701                 }
702
703         if ((*p_getaddrinfo.f)(h,p,&hint,&res)) break;
704
705         addrlen = res->ai_addrlen<=sizeof(server) ?
706                         res->ai_addrlen :
707                         sizeof(server);
708         memcpy(&server, res->ai_addr, addrlen);
709
710         (*p_freeaddrinfo.f)(res);
711         goto again;
712         } while (0);
713 #endif
714
715         if (!BIO_get_port(p,&port)) goto err;
716
717         memset((char *)&server,0,sizeof(server));
718         server.sa_in.sin_family=AF_INET;
719         server.sa_in.sin_port=htons(port);
720         addrlen = sizeof(server.sa_in);
721
722         if (h == NULL || strcmp(h,"*") == 0)
723                 server.sa_in.sin_addr.s_addr=INADDR_ANY;
724         else
725                 {
726                 if (!BIO_get_host_ip(h,&(ip[0]))) goto err;
727                 l=(unsigned long)
728                         ((unsigned long)ip[0]<<24L)|
729                         ((unsigned long)ip[1]<<16L)|
730                         ((unsigned long)ip[2]<< 8L)|
731                         ((unsigned long)ip[3]);
732                 server.sa_in.sin_addr.s_addr=htonl(l);
733                 }
734
735 again:
736         s=socket(server.sa.sa_family,SOCK_STREAM,SOCKET_PROTOCOL);
737         if (s == INVALID_SOCKET)
738                 {
739                 SYSerr(SYS_F_SOCKET,get_last_socket_error());
740                 ERR_add_error_data(3,"port='",host,"'");
741                 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET,BIO_R_UNABLE_TO_CREATE_SOCKET);
742                 goto err;
743                 }
744
745 #ifdef SO_REUSEADDR
746         if (bind_mode == BIO_BIND_REUSEADDR)
747                 {
748                 int i=1;
749
750                 ret=setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&i,sizeof(i));
751                 bind_mode=BIO_BIND_NORMAL;
752                 }
753 #endif
754         if (bind(s,&server.sa,addrlen) == -1)
755                 {
756 #ifdef SO_REUSEADDR
757                 err_num=get_last_socket_error();
758                 if ((bind_mode == BIO_BIND_REUSEADDR_IF_UNUSED) &&
759 #ifdef OPENSSL_SYS_WINDOWS
760                         /* Some versions of Windows define EADDRINUSE to
761                          * a dummy value.
762                          */
763                         (err_num == WSAEADDRINUSE))
764 #else
765                         (err_num == EADDRINUSE))
766 #endif
767                         {
768                         client = server;
769                         if (h == NULL || strcmp(h,"*") == 0)
770                                 {
771 #if OPENSSL_USE_IPV6
772                                 if (client.sa.sa_family == AF_INET6)
773                                         {
774                                         memset(&client.sa_in6.sin6_addr,0,sizeof(client.sa_in6.sin6_addr));
775                                         client.sa_in6.sin6_addr.s6_addr[15]=1;
776                                         }
777                                 else
778 #endif
779                                 if (client.sa.sa_family == AF_INET)
780                                         {
781                                         client.sa_in.sin_addr.s_addr=htonl(0x7F000001);
782                                         }
783                                 else    goto err;
784                                 }
785                         cs=socket(client.sa.sa_family,SOCK_STREAM,SOCKET_PROTOCOL);
786                         if (cs != INVALID_SOCKET)
787                                 {
788                                 int ii;
789                                 ii=connect(cs,&client.sa,addrlen);
790                                 closesocket(cs);
791                                 if (ii == INVALID_SOCKET)
792                                         {
793                                         bind_mode=BIO_BIND_REUSEADDR;
794                                         closesocket(s);
795                                         goto again;
796                                         }
797                                 /* else error */
798                                 }
799                         /* else error */
800                         }
801 #endif
802                 SYSerr(SYS_F_BIND,err_num);
803                 ERR_add_error_data(3,"port='",host,"'");
804                 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET,BIO_R_UNABLE_TO_BIND_SOCKET);
805                 goto err;
806                 }
807         if (listen(s,MAX_LISTEN) == -1)
808                 {
809                 SYSerr(SYS_F_BIND,get_last_socket_error());
810                 ERR_add_error_data(3,"port='",host,"'");
811                 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET,BIO_R_UNABLE_TO_LISTEN_SOCKET);
812                 goto err;
813                 }
814         ret=1;
815 err:
816         if (str != NULL) OPENSSL_free(str);
817         if ((ret == 0) && (s != INVALID_SOCKET))
818                 {
819                 closesocket(s);
820                 s= INVALID_SOCKET;
821                 }
822         return(s);
823         }
824
825 int BIO_accept(int sock, char **addr)
826         {
827         int ret=INVALID_SOCKET;
828         unsigned long l;
829         unsigned short port;
830         char *p;
831
832         struct {
833         /*
834          * As for following union. Trouble is that there are platforms
835          * that have socklen_t and there are platforms that don't, on
836          * some platforms socklen_t is int and on some size_t. So what
837          * one can do? One can cook #ifdef spaghetti, which is nothing
838          * but masochistic. Or one can do union between int and size_t.
839          * One naturally does it primarily for 64-bit platforms where
840          * sizeof(int) != sizeof(size_t). But would it work? Note that
841          * if size_t member is initialized to 0, then later int member
842          * assignment naturally does the job on little-endian platforms
843          * regardless accept's expectations! What about big-endians?
844          * If accept expects int*, then it works, and if size_t*, then
845          * length value would appear as unreasonably large. But this
846          * won't prevent it from filling in the address structure. The
847          * trouble of course would be if accept returns more data than
848          * actual buffer can accomodate and overwrite stack... That's
849          * where early OPENSSL_assert comes into picture. Besides, the
850          * only 64-bit big-endian platform found so far that expects
851          * size_t* is HP-UX, where stack grows towards higher address.
852          * <appro>
853          */
854         union { size_t s; int i; } len;
855         union {
856                 struct sockaddr sa;
857                 struct sockaddr_in sa_in;
858 #if OPENSSL_USE_IPV6
859                 struct sockaddr_in6 sa_in6;
860 #endif
861                 } from;
862         } sa;
863
864         sa.len.s=0;
865         sa.len.i=sizeof(sa.from);
866         memset(&sa.from,0,sizeof(sa.from));
867         ret=accept(sock,&sa.from.sa,(void *)&sa.len);
868         if (sizeof(sa.len.i)!=sizeof(sa.len.s) && sa.len.i==0)
869                 {
870                 OPENSSL_assert(sa.len.s<=sizeof(sa.from));
871                 sa.len.i = (int)sa.len.s;
872                 /* use sa.len.i from this point */
873                 }
874         if (ret == INVALID_SOCKET)
875                 {
876                 if(BIO_sock_should_retry(ret)) return -2;
877                 SYSerr(SYS_F_ACCEPT,get_last_socket_error());
878                 BIOerr(BIO_F_BIO_ACCEPT,BIO_R_ACCEPT_ERROR);
879                 goto end;
880                 }
881
882         if (addr == NULL) goto end;
883
884 #ifdef EAI_FAMILY
885         do {
886         char   h[NI_MAXHOST],s[NI_MAXSERV];
887         size_t nl;
888         static union {  void *p;
889                         int (WSAAPI *f)(const struct sockaddr *,size_t/*socklen_t*/,
890                                  char *,size_t,char *,size_t,int);
891                         } p_getnameinfo = {NULL};
892                         /* 2nd argument to getnameinfo is specified to
893                          * be socklen_t. Unfortunately there is a number
894                          * of environments where socklen_t is not defined.
895                          * As it's passed by value, it's safe to pass it
896                          * as size_t... <appro> */
897
898         if (p_getnameinfo.p==NULL)
899                 {
900                 if ((p_getnameinfo.p=DSO_global_lookup("getnameinfo"))==NULL)
901                         p_getnameinfo.p=(void*)-1;
902                 }
903         if (p_getnameinfo.p==(void *)-1) break;
904
905         if ((*p_getnameinfo.f)(&sa.from.sa,sa.len.i,h,sizeof(h),s,sizeof(s),
906             NI_NUMERICHOST|NI_NUMERICSERV)) break;
907         nl = strlen(h)+strlen(s)+2;
908         p = *addr;
909         if (p)  { *p = '\0'; p = OPENSSL_realloc(p,nl); }
910         else    { p = OPENSSL_malloc(nl);               }
911         if (p==NULL)
912                 {
913                 BIOerr(BIO_F_BIO_ACCEPT,ERR_R_MALLOC_FAILURE);
914                 goto end;
915                 }
916         *addr = p;
917         BIO_snprintf(*addr,nl,"%s:%s",h,s);
918         goto end;
919         } while(0);
920 #endif
921         if (sa.from.sa.sa_family != AF_INET) goto end;
922         l=ntohl(sa.from.sa_in.sin_addr.s_addr);
923         port=ntohs(sa.from.sa_in.sin_port);
924         if (*addr == NULL)
925                 {
926                 if ((p=OPENSSL_malloc(24)) == NULL)
927                         {
928                         BIOerr(BIO_F_BIO_ACCEPT,ERR_R_MALLOC_FAILURE);
929                         goto end;
930                         }
931                 *addr=p;
932                 }
933         BIO_snprintf(*addr,24,"%d.%d.%d.%d:%d",
934                      (unsigned char)(l>>24L)&0xff,
935                      (unsigned char)(l>>16L)&0xff,
936                      (unsigned char)(l>> 8L)&0xff,
937                      (unsigned char)(l     )&0xff,
938                      port);
939 end:
940         return(ret);
941         }
942
943 int BIO_set_tcp_ndelay(int s, int on)
944         {
945         int ret=0;
946 #if defined(TCP_NODELAY) && (defined(IPPROTO_TCP) || defined(SOL_TCP))
947         int opt;
948
949 #ifdef SOL_TCP
950         opt=SOL_TCP;
951 #else
952 #ifdef IPPROTO_TCP
953         opt=IPPROTO_TCP;
954 #endif
955 #endif
956         
957         ret=setsockopt(s,opt,TCP_NODELAY,(char *)&on,sizeof(on));
958 #endif
959         return(ret == 0);
960         }
961
962 int BIO_socket_nbio(int s, int mode)
963         {
964         int ret= -1;
965         int l;
966
967         l=mode;
968 #ifdef FIONBIO
969         ret=BIO_socket_ioctl(s,FIONBIO,&l);
970 #endif
971         return(ret == 0);
972         }
973 #endif