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1 /* apps/s_socket.c -  socket-related functions used by s_client and s_server */
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 <string.h>
62 #include <errno.h>
63 #include <signal.h>
64
65 #ifdef FLAT_INC
66 #include "e_os2.h"
67 #else
68 #include "../e_os2.h"
69 #endif
70
71 /* With IPv6, it looks like Digital has mixed up the proper order of
72    recursive header file inclusion, resulting in the compiler complaining
73    that u_int isn't defined, but only if _POSIX_C_SOURCE is defined, which
74    is needed to have fileno() declared correctly...  So let's define u_int */
75 #if defined(OPENSSL_SYS_VMS_DECC) && !defined(__U_INT)
76 #define __U_INT
77 typedef unsigned int u_int;
78 #endif
79
80 #define USE_SOCKETS
81 #define NON_MAIN
82 #include "apps.h"
83 #undef USE_SOCKETS
84 #undef NON_MAIN
85 #include "s_apps.h"
86 #include <openssl/ssl.h>
87
88 #ifdef FLAT_INC
89 #include "e_os.h"
90 #else
91 #include "../e_os.h"
92 #endif
93
94 #ifndef OPENSSL_NO_SOCK
95
96 #if defined(OPENSSL_SYS_NETWARE) && defined(NETWARE_BSDSOCK)
97 #include "netdb.h"
98 #endif
99
100 static struct hostent *GetHostByName(char *name);
101 #if defined(OPENSSL_SYS_WINDOWS) || (defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK))
102 static void ssl_sock_cleanup(void);
103 #endif
104 static int ssl_sock_init(void);
105 static int init_client_ip(int *sock,unsigned char ip[4], int port, int type);
106 static int init_server(int *sock, int port, int type);
107 static int init_server_long(int *sock, int port,char *ip, int type);
108 static int do_accept(int acc_sock, int *sock, char **host);
109 static int host_ip(char *str, unsigned char ip[4]);
110
111 #ifdef OPENSSL_SYS_WIN16
112 #define SOCKET_PROTOCOL 0 /* more microsoft stupidity */
113 #else
114 #define SOCKET_PROTOCOL IPPROTO_TCP
115 #endif
116
117 #if defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK)
118 static int wsa_init_done=0;
119 #endif
120
121 #ifdef OPENSSL_SYS_WINDOWS
122 static struct WSAData wsa_state;
123 static int wsa_init_done=0;
124
125 #ifdef OPENSSL_SYS_WIN16
126 static HWND topWnd=0;
127 static FARPROC lpTopWndProc=NULL;
128 static FARPROC lpTopHookProc=NULL;
129 extern HINSTANCE _hInstance;  /* nice global CRT provides */
130
131 static LONG FAR PASCAL topHookProc(HWND hwnd, UINT message, WPARAM wParam,
132              LPARAM lParam)
133         {
134         if (hwnd == topWnd)
135                 {
136                 switch(message)
137                         {
138                 case WM_DESTROY:
139                 case WM_CLOSE:
140                         SetWindowLong(topWnd,GWL_WNDPROC,(LONG)lpTopWndProc);
141                         ssl_sock_cleanup();
142                         break;
143                         }
144                 }
145         return CallWindowProc(lpTopWndProc,hwnd,message,wParam,lParam);
146         }
147
148 static BOOL CALLBACK enumproc(HWND hwnd,LPARAM lParam)
149         {
150         topWnd=hwnd;
151         return(FALSE);
152         }
153
154 #endif /* OPENSSL_SYS_WIN32 */
155 #endif /* OPENSSL_SYS_WINDOWS */
156
157 #ifdef OPENSSL_SYS_WINDOWS
158 static void ssl_sock_cleanup(void)
159         {
160         if (wsa_init_done)
161                 {
162                 wsa_init_done=0;
163 #ifndef OPENSSL_SYS_WINCE
164                 WSACancelBlockingCall();
165 #endif
166                 WSACleanup();
167                 }
168         }
169 #elif defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK)
170 static void sock_cleanup(void)
171     {
172     if (wsa_init_done)
173         {
174         wsa_init_done=0;
175                 WSACleanup();
176                 }
177         }
178 #endif
179
180 static int ssl_sock_init(void)
181         {
182 #ifdef WATT32
183         extern int _watt_do_exit;
184         _watt_do_exit = 0;
185         if (sock_init())
186                 return (0);
187 #elif defined(OPENSSL_SYS_WINDOWS)
188         if (!wsa_init_done)
189                 {
190                 int err;
191           
192 #ifdef SIGINT
193                 signal(SIGINT,(void (*)(int))ssl_sock_cleanup);
194 #endif
195                 wsa_init_done=1;
196                 memset(&wsa_state,0,sizeof(wsa_state));
197                 if (WSAStartup(0x0101,&wsa_state)!=0)
198                         {
199                         err=WSAGetLastError();
200                         BIO_printf(bio_err,"unable to start WINSOCK, error code=%d\n",err);
201                         return(0);
202                         }
203
204 #ifdef OPENSSL_SYS_WIN16
205                 EnumTaskWindows(GetCurrentTask(),enumproc,0L);
206                 lpTopWndProc=(FARPROC)GetWindowLong(topWnd,GWL_WNDPROC);
207                 lpTopHookProc=MakeProcInstance((FARPROC)topHookProc,_hInstance);
208
209                 SetWindowLong(topWnd,GWL_WNDPROC,(LONG)lpTopHookProc);
210 #endif /* OPENSSL_SYS_WIN16 */
211                 }
212 #elif defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK)
213    WORD wVerReq;
214    WSADATA wsaData;
215    int err;
216
217    if (!wsa_init_done)
218       {
219    
220 # ifdef SIGINT
221       signal(SIGINT,(void (*)(int))sock_cleanup);
222 # endif
223
224       wsa_init_done=1;
225       wVerReq = MAKEWORD( 2, 0 );
226       err = WSAStartup(wVerReq,&wsaData);
227       if (err != 0)
228          {
229          BIO_printf(bio_err,"unable to start WINSOCK2, error code=%d\n",err);
230          return(0);
231          }
232       }
233 #endif /* OPENSSL_SYS_WINDOWS */
234         return(1);
235         }
236
237 int init_client(int *sock, char *host, int port, int type)
238         {
239         unsigned char ip[4];
240         short p=0;
241
242         if (!host_ip(host,&(ip[0])))
243                 {
244                 return(0);
245                 }
246         if (p != 0) port=p;
247         return(init_client_ip(sock,ip,port,type));
248         }
249
250 static int init_client_ip(int *sock, unsigned char ip[4], int port, int type)
251         {
252         unsigned long addr;
253         struct sockaddr_in them;
254         int s,i;
255
256         if (!ssl_sock_init()) return(0);
257
258         memset((char *)&them,0,sizeof(them));
259         them.sin_family=AF_INET;
260         them.sin_port=htons((unsigned short)port);
261         addr=(unsigned long)
262                 ((unsigned long)ip[0]<<24L)|
263                 ((unsigned long)ip[1]<<16L)|
264                 ((unsigned long)ip[2]<< 8L)|
265                 ((unsigned long)ip[3]);
266         them.sin_addr.s_addr=htonl(addr);
267
268         if (type == SOCK_STREAM)
269                 s=socket(AF_INET,SOCK_STREAM,SOCKET_PROTOCOL);
270         else /* ( type == SOCK_DGRAM) */
271                 s=socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);
272                         
273         if (s == INVALID_SOCKET) { perror("socket"); return(0); }
274
275 #ifndef OPENSSL_SYS_MPE
276         if (type == SOCK_STREAM)
277                 {
278                 i=0;
279                 i=setsockopt(s,SOL_SOCKET,SO_KEEPALIVE,(char *)&i,sizeof(i));
280                 if (i < 0) { perror("keepalive"); return(0); }
281                 }
282 #endif
283
284         if (connect(s,(struct sockaddr *)&them,sizeof(them)) == -1)
285                 { close(s); perror("connect"); return(0); }
286         *sock=s;
287         return(1);
288         }
289
290 int do_server(int port, int type, int *ret, int (*cb)(char *hostname, int s, unsigned char *context), unsigned char *context)
291         {
292         int sock;
293         char *name = NULL;
294         int accept_socket;
295         int i;
296
297         if (!init_server(&accept_socket,port,type)) return(0);
298
299         if (ret != NULL)
300                 {
301                 *ret=accept_socket;
302                 /* return(1);*/
303                 }
304         for (;;)
305                 {
306                 if (type==SOCK_STREAM)
307                         {
308                         if (do_accept(accept_socket,&sock,&name) == 0)
309                                 {
310                                 SHUTDOWN(accept_socket);
311                                 return(0);
312                                 }
313                         }
314                 else
315                         sock = accept_socket;
316                 i=(*cb)(name,sock, context);
317                 if (name != NULL) OPENSSL_free(name);
318                 if (type==SOCK_STREAM)
319                         SHUTDOWN2(sock);
320                 if (i < 0)
321                         {
322                         SHUTDOWN2(accept_socket);
323                         return(i);
324                         }
325                 }
326         }
327
328 static int init_server_long(int *sock, int port, char *ip, int type)
329         {
330         int ret=0;
331         struct sockaddr_in server;
332         int s= -1,i;
333
334         if (!ssl_sock_init()) return(0);
335
336         memset((char *)&server,0,sizeof(server));
337         server.sin_family=AF_INET;
338         server.sin_port=htons((unsigned short)port);
339         if (ip == NULL)
340                 server.sin_addr.s_addr=INADDR_ANY;
341         else
342 /* Added for T3E, address-of fails on bit field (beckman@acl.lanl.gov) */
343 #ifndef BIT_FIELD_LIMITS
344                 memcpy(&server.sin_addr.s_addr,ip,4);
345 #else
346                 memcpy(&server.sin_addr,ip,4);
347 #endif
348         
349                 if (type == SOCK_STREAM)
350                         s=socket(AF_INET,SOCK_STREAM,SOCKET_PROTOCOL);
351                 else /* type == SOCK_DGRAM */
352                         s=socket(AF_INET, SOCK_DGRAM,IPPROTO_UDP);
353
354         if (s == INVALID_SOCKET) goto err;
355 #if defined SOL_SOCKET && defined SO_REUSEADDR
356                 {
357                 int j = 1;
358                 setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
359                            (void *) &j, sizeof j);
360                 }
361 #endif
362         if (bind(s,(struct sockaddr *)&server,sizeof(server)) == -1)
363                 {
364 #ifndef OPENSSL_SYS_WINDOWS
365                 perror("bind");
366 #endif
367                 goto err;
368                 }
369         /* Make it 128 for linux */
370         if (type==SOCK_STREAM && listen(s,128) == -1) goto err;
371         i=0;
372         *sock=s;
373         ret=1;
374 err:
375         if ((ret == 0) && (s != -1))
376                 {
377                 SHUTDOWN(s);
378                 }
379         return(ret);
380         }
381
382 static int init_server(int *sock, int port, int type)
383         {
384         return(init_server_long(sock, port, NULL, type));
385         }
386
387 static int do_accept(int acc_sock, int *sock, char **host)
388         {
389         int ret,i;
390         struct hostent *h1,*h2;
391         static struct sockaddr_in from;
392         int len;
393 /*      struct linger ling; */
394
395         if (!ssl_sock_init()) return(0);
396
397 #ifndef OPENSSL_SYS_WINDOWS
398 redoit:
399 #endif
400
401         memset((char *)&from,0,sizeof(from));
402         len=sizeof(from);
403         /* Note: under VMS with SOCKETSHR the fourth parameter is currently
404          * of type (int *) whereas under other systems it is (void *) if
405          * you don't have a cast it will choke the compiler: if you do
406          * have a cast then you can either go for (int *) or (void *).
407          */
408         ret=accept(acc_sock,(struct sockaddr *)&from,(void *)&len);
409         if (ret == INVALID_SOCKET)
410                 {
411 #if defined(OPENSSL_SYS_WINDOWS) || (defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK))
412                 i=WSAGetLastError();
413                 BIO_printf(bio_err,"accept error %d\n",i);
414 #else
415                 if (errno == EINTR)
416                         {
417                         /*check_timeout(); */
418                         goto redoit;
419                         }
420                 fprintf(stderr,"errno=%d ",errno);
421                 perror("accept");
422 #endif
423                 return(0);
424                 }
425
426 /*
427         ling.l_onoff=1;
428         ling.l_linger=0;
429         i=setsockopt(ret,SOL_SOCKET,SO_LINGER,(char *)&ling,sizeof(ling));
430         if (i < 0) { perror("linger"); return(0); }
431         i=0;
432         i=setsockopt(ret,SOL_SOCKET,SO_KEEPALIVE,(char *)&i,sizeof(i));
433         if (i < 0) { perror("keepalive"); return(0); }
434 */
435
436         if (host == NULL) goto end;
437 #ifndef BIT_FIELD_LIMITS
438         /* I should use WSAAsyncGetHostByName() under windows */
439         h1=gethostbyaddr((char *)&from.sin_addr.s_addr,
440                 sizeof(from.sin_addr.s_addr),AF_INET);
441 #else
442         h1=gethostbyaddr((char *)&from.sin_addr,
443                 sizeof(struct in_addr),AF_INET);
444 #endif
445         if (h1 == NULL)
446                 {
447                 BIO_printf(bio_err,"bad gethostbyaddr\n");
448                 *host=NULL;
449                 /* return(0); */
450                 }
451         else
452                 {
453                 if ((*host=(char *)OPENSSL_malloc(strlen(h1->h_name)+1)) == NULL)
454                         {
455                         perror("OPENSSL_malloc");
456                         return(0);
457                         }
458                 BUF_strlcpy(*host,h1->h_name,strlen(h1->h_name)+1);
459
460                 h2=GetHostByName(*host);
461                 if (h2 == NULL)
462                         {
463                         BIO_printf(bio_err,"gethostbyname failure\n");
464                         return(0);
465                         }
466                 i=0;
467                 if (h2->h_addrtype != AF_INET)
468                         {
469                         BIO_printf(bio_err,"gethostbyname addr is not AF_INET\n");
470                         return(0);
471                         }
472                 }
473 end:
474         *sock=ret;
475         return(1);
476         }
477
478 int extract_host_port(char *str, char **host_ptr, unsigned char *ip,
479              short *port_ptr)
480         {
481         char *h,*p;
482
483         h=str;
484         p=strchr(str,':');
485         if (p == NULL)
486                 {
487                 BIO_printf(bio_err,"no port defined\n");
488                 return(0);
489                 }
490         *(p++)='\0';
491
492         if ((ip != NULL) && !host_ip(str,ip))
493                 goto err;
494         if (host_ptr != NULL) *host_ptr=h;
495
496         if (!extract_port(p,port_ptr))
497                 goto err;
498         return(1);
499 err:
500         return(0);
501         }
502
503 static int host_ip(char *str, unsigned char ip[4])
504         {
505         unsigned int in[4]; 
506         int i;
507
508         if (sscanf(str,"%u.%u.%u.%u",&(in[0]),&(in[1]),&(in[2]),&(in[3])) == 4)
509                 {
510                 for (i=0; i<4; i++)
511                         if (in[i] > 255)
512                                 {
513                                 BIO_printf(bio_err,"invalid IP address\n");
514                                 goto err;
515                                 }
516                 ip[0]=in[0];
517                 ip[1]=in[1];
518                 ip[2]=in[2];
519                 ip[3]=in[3];
520                 }
521         else
522                 { /* do a gethostbyname */
523                 struct hostent *he;
524
525                 if (!ssl_sock_init()) return(0);
526
527                 he=GetHostByName(str);
528                 if (he == NULL)
529                         {
530                         BIO_printf(bio_err,"gethostbyname failure\n");
531                         goto err;
532                         }
533                 /* cast to short because of win16 winsock definition */
534                 if ((short)he->h_addrtype != AF_INET)
535                         {
536                         BIO_printf(bio_err,"gethostbyname addr is not AF_INET\n");
537                         return(0);
538                         }
539                 ip[0]=he->h_addr_list[0][0];
540                 ip[1]=he->h_addr_list[0][1];
541                 ip[2]=he->h_addr_list[0][2];
542                 ip[3]=he->h_addr_list[0][3];
543                 }
544         return(1);
545 err:
546         return(0);
547         }
548
549 int extract_port(char *str, short *port_ptr)
550         {
551         int i;
552         struct servent *s;
553
554         i=atoi(str);
555         if (i != 0)
556                 *port_ptr=(unsigned short)i;
557         else
558                 {
559                 s=getservbyname(str,"tcp");
560                 if (s == NULL)
561                         {
562                         BIO_printf(bio_err,"getservbyname failure for %s\n",str);
563                         return(0);
564                         }
565                 *port_ptr=ntohs((unsigned short)s->s_port);
566                 }
567         return(1);
568         }
569
570 #define GHBN_NUM        4
571 static struct ghbn_cache_st
572         {
573         char name[128];
574         struct hostent ent;
575         unsigned long order;
576         } ghbn_cache[GHBN_NUM];
577
578 static unsigned long ghbn_hits=0L;
579 static unsigned long ghbn_miss=0L;
580
581 static struct hostent *GetHostByName(char *name)
582         {
583         struct hostent *ret;
584         int i,lowi=0;
585         unsigned long low= (unsigned long)-1;
586
587         for (i=0; i<GHBN_NUM; i++)
588                 {
589                 if (low > ghbn_cache[i].order)
590                         {
591                         low=ghbn_cache[i].order;
592                         lowi=i;
593                         }
594                 if (ghbn_cache[i].order > 0)
595                         {
596                         if (strncmp(name,ghbn_cache[i].name,128) == 0)
597                                 break;
598                         }
599                 }
600         if (i == GHBN_NUM) /* no hit*/
601                 {
602                 ghbn_miss++;
603                 ret=gethostbyname(name);
604                 if (ret == NULL) return(NULL);
605                 /* else add to cache */
606                 if(strlen(name) < sizeof ghbn_cache[0].name)
607                         {
608                         strcpy(ghbn_cache[lowi].name,name);
609                         memcpy((char *)&(ghbn_cache[lowi].ent),ret,sizeof(struct hostent));
610                         ghbn_cache[lowi].order=ghbn_miss+ghbn_hits;
611                         }
612                 return(ret);
613                 }
614         else
615                 {
616                 ghbn_hits++;
617                 ret= &(ghbn_cache[i].ent);
618                 ghbn_cache[i].order=ghbn_miss+ghbn_hits;
619                 return(ret);
620                 }
621         }
622
623 #endif