727425744c73efb5c91d5cb3a1c3da4e5adc5ca7
[openssl.git] / apps / s_socket.c
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 /* With IPv6, it looks like Digital has mixed up the proper order of
66    recursive header file inclusion, resulting in the compiler complaining
67    that u_int isn't defined, but only if _POSIX_C_SOURCE is defined, which
68    is needed to have fileno() declared correctly...  So let's define u_int */
69 #if defined(OPENSSL_SYS_VMS_DECC) && !defined(__U_INT)
70 #define __U_INT
71 typedef unsigned int u_int;
72 #endif
73
74 #define USE_SOCKETS
75 #define NON_MAIN
76 #include "apps.h"
77 #undef USE_SOCKETS
78 #undef NON_MAIN
79 #include "s_apps.h"
80 #include <openssl/ssl.h>
81
82 #ifdef FLAT_INC
83 #include "e_os.h"
84 #else
85 #include "../e_os.h"
86 #endif
87
88 #ifndef OPENSSL_NO_SOCK
89
90 static struct hostent *GetHostByName(char *name);
91 #if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_NETWARE)
92 static void ssl_sock_cleanup(void);
93 #endif
94 static int ssl_sock_init(void);
95 static int init_client_ip(int *sock,unsigned char ip[4], int port);
96 static int init_server(int *sock, int port);
97 static int init_server_long(int *sock, int port,char *ip);
98 static int do_accept(int acc_sock, int *sock, char **host);
99 static int host_ip(char *str, unsigned char ip[4]);
100
101 #ifdef OPENSSL_SYS_WIN16
102 #define SOCKET_PROTOCOL 0 /* more microsoft stupidity */
103 #else
104 #define SOCKET_PROTOCOL IPPROTO_TCP
105 #endif
106
107 #ifdef OPENSSL_SYS_NETWARE
108 static int wsa_init_done=0;
109 #endif
110
111 #ifdef OPENSSL_SYS_WINDOWS
112 static struct WSAData wsa_state;
113 static int wsa_init_done=0;
114
115 #ifdef OPENSSL_SYS_WIN16
116 static HWND topWnd=0;
117 static FARPROC lpTopWndProc=NULL;
118 static FARPROC lpTopHookProc=NULL;
119 extern HINSTANCE _hInstance;  /* nice global CRT provides */
120
121 static LONG FAR PASCAL topHookProc(HWND hwnd, UINT message, WPARAM wParam,
122              LPARAM lParam)
123         {
124         if (hwnd == topWnd)
125                 {
126                 switch(message)
127                         {
128                 case WM_DESTROY:
129                 case WM_CLOSE:
130                         SetWindowLong(topWnd,GWL_WNDPROC,(LONG)lpTopWndProc);
131                         ssl_sock_cleanup();
132                         break;
133                         }
134                 }
135         return CallWindowProc(lpTopWndProc,hwnd,message,wParam,lParam);
136         }
137
138 static BOOL CALLBACK enumproc(HWND hwnd,LPARAM lParam)
139         {
140         topWnd=hwnd;
141         return(FALSE);
142         }
143
144 #endif /* OPENSSL_SYS_WIN32 */
145 #endif /* OPENSSL_SYS_WINDOWS */
146
147 #ifdef OPENSSL_SYS_WINDOWS
148 static void ssl_sock_cleanup(void)
149         {
150         if (wsa_init_done)
151                 {
152                 wsa_init_done=0;
153 #ifndef OPENSSL_SYS_WINCE
154                 WSACancelBlockingCall();
155 #endif
156                 WSACleanup();
157                 }
158         }
159 #elif defined(OPENSSL_SYS_NETWARE)
160 static void sock_cleanup(void)
161     {
162     if (wsa_init_done)
163         {
164         wsa_init_done=0;
165                 WSACleanup();
166                 }
167         }
168 #endif
169
170 static int ssl_sock_init(void)
171         {
172 #ifdef WATT32
173         extern int _watt_do_exit;
174         _watt_do_exit = 0;
175         if (sock_init())
176                 return (0);
177 #elif defined(OPENSSL_SYS_WINDOWS)
178         if (!wsa_init_done)
179                 {
180                 int err;
181           
182 #ifdef SIGINT
183                 signal(SIGINT,(void (*)(int))ssl_sock_cleanup);
184 #endif
185                 wsa_init_done=1;
186                 memset(&wsa_state,0,sizeof(wsa_state));
187                 if (WSAStartup(0x0101,&wsa_state)!=0)
188                         {
189                         err=WSAGetLastError();
190                         BIO_printf(bio_err,"unable to start WINSOCK, error code=%d\n",err);
191                         return(0);
192                         }
193
194 #ifdef OPENSSL_SYS_WIN16
195                 EnumTaskWindows(GetCurrentTask(),enumproc,0L);
196                 lpTopWndProc=(FARPROC)GetWindowLong(topWnd,GWL_WNDPROC);
197                 lpTopHookProc=MakeProcInstance((FARPROC)topHookProc,_hInstance);
198
199                 SetWindowLong(topWnd,GWL_WNDPROC,(LONG)lpTopHookProc);
200 #endif /* OPENSSL_SYS_WIN16 */
201                 }
202 #elif defined(OPENSSL_SYS_NETWARE)
203    WORD wVerReq;
204    WSADATA wsaData;
205    int err;
206
207    if (!wsa_init_done)
208       {
209    
210 # ifdef SIGINT
211       signal(SIGINT,(void (*)(int))sock_cleanup);
212 # endif
213
214       wsa_init_done=1;
215       wVerReq = MAKEWORD( 2, 0 );
216       err = WSAStartup(wVerReq,&wsaData);
217       if (err != 0)
218          {
219          BIO_printf(bio_err,"unable to start WINSOCK2, error code=%d\n",err);
220          return(0);
221          }
222       }
223 #endif /* OPENSSL_SYS_WINDOWS */
224         return(1);
225         }
226
227 int init_client(int *sock, char *host, int port)
228         {
229         unsigned char ip[4];
230         short p=0;
231
232         if (!host_ip(host,&(ip[0])))
233                 {
234                 return(0);
235                 }
236         if (p != 0) port=p;
237         return(init_client_ip(sock,ip,port));
238         }
239
240 static int init_client_ip(int *sock, unsigned char ip[4], int port)
241         {
242         unsigned long addr;
243         struct sockaddr_in them;
244         int s,i;
245
246         if (!ssl_sock_init()) return(0);
247
248         memset((char *)&them,0,sizeof(them));
249         them.sin_family=AF_INET;
250         them.sin_port=htons((unsigned short)port);
251         addr=(unsigned long)
252                 ((unsigned long)ip[0]<<24L)|
253                 ((unsigned long)ip[1]<<16L)|
254                 ((unsigned long)ip[2]<< 8L)|
255                 ((unsigned long)ip[3]);
256         them.sin_addr.s_addr=htonl(addr);
257
258         s=socket(AF_INET,SOCK_STREAM,SOCKET_PROTOCOL);
259         if (s == INVALID_SOCKET) { perror("socket"); return(0); }
260
261 #ifndef OPENSSL_SYS_MPE
262         i=0;
263         i=setsockopt(s,SOL_SOCKET,SO_KEEPALIVE,(char *)&i,sizeof(i));
264         if (i < 0) { perror("keepalive"); return(0); }
265 #endif
266
267         if (connect(s,(struct sockaddr *)&them,sizeof(them)) == -1)
268                 { close(s); perror("connect"); return(0); }
269         *sock=s;
270         return(1);
271         }
272
273 int do_server(int port, int *ret, int (*cb)(char *hostname, int s, unsigned char *context), char *context)
274         {
275         int sock;
276         char *name;
277         int accept_socket;
278         int i;
279
280         if (!init_server(&accept_socket,port)) return(0);
281
282         if (ret != NULL)
283                 {
284                 *ret=accept_socket;
285                 /* return(1);*/
286                 }
287         for (;;)
288                 {
289                 if (do_accept(accept_socket,&sock,&name) == 0)
290                         {
291                         SHUTDOWN(accept_socket);
292                         return(0);
293                         }
294                 i=(*cb)(name,sock, context);
295                 if (name != NULL) OPENSSL_free(name);
296                 SHUTDOWN2(sock);
297                 if (i < 0)
298                         {
299                         SHUTDOWN2(accept_socket);
300                         return(i);
301                         }
302                 }
303         }
304
305 static int init_server_long(int *sock, int port, char *ip)
306         {
307         int ret=0;
308         struct sockaddr_in server;
309         int s= -1,i;
310
311         if (!ssl_sock_init()) return(0);
312
313         memset((char *)&server,0,sizeof(server));
314         server.sin_family=AF_INET;
315         server.sin_port=htons((unsigned short)port);
316         if (ip == NULL)
317                 server.sin_addr.s_addr=INADDR_ANY;
318         else
319 /* Added for T3E, address-of fails on bit field (beckman@acl.lanl.gov) */
320 #ifndef BIT_FIELD_LIMITS
321                 memcpy(&server.sin_addr.s_addr,ip,4);
322 #else
323                 memcpy(&server.sin_addr,ip,4);
324 #endif
325         s=socket(AF_INET,SOCK_STREAM,SOCKET_PROTOCOL);
326
327         if (s == INVALID_SOCKET) goto err;
328 #if defined SOL_SOCKET && defined SO_REUSEADDR
329                 {
330                 int j = 1;
331                 setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
332                            (void *) &j, sizeof j);
333                 }
334 #endif
335         if (bind(s,(struct sockaddr *)&server,sizeof(server)) == -1)
336                 {
337 #ifndef OPENSSL_SYS_WINDOWS
338                 perror("bind");
339 #endif
340                 goto err;
341                 }
342         /* Make it 128 for linux */
343         if (listen(s,128) == -1) goto err;
344         i=0;
345         *sock=s;
346         ret=1;
347 err:
348         if ((ret == 0) && (s != -1))
349                 {
350                 SHUTDOWN(s);
351                 }
352         return(ret);
353         }
354
355 static int init_server(int *sock, int port)
356         {
357         return(init_server_long(sock, port, NULL));
358         }
359
360 static int do_accept(int acc_sock, int *sock, char **host)
361         {
362         int ret,i;
363         struct hostent *h1,*h2;
364         static struct sockaddr_in from;
365         int len;
366 /*      struct linger ling; */
367
368         if (!ssl_sock_init()) return(0);
369
370 #ifndef OPENSSL_SYS_WINDOWS
371 redoit:
372 #endif
373
374         memset((char *)&from,0,sizeof(from));
375         len=sizeof(from);
376         /* Note: under VMS with SOCKETSHR the fourth parameter is currently
377          * of type (int *) whereas under other systems it is (void *) if
378          * you don't have a cast it will choke the compiler: if you do
379          * have a cast then you can either go for (int *) or (void *).
380          */
381         ret=accept(acc_sock,(struct sockaddr *)&from,(void *)&len);
382         if (ret == INVALID_SOCKET)
383                 {
384 #if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_NETWARE)
385                 i=WSAGetLastError();
386                 BIO_printf(bio_err,"accept error %d\n",i);
387 #else
388                 if (errno == EINTR)
389                         {
390                         /*check_timeout(); */
391                         goto redoit;
392                         }
393                 fprintf(stderr,"errno=%d ",errno);
394                 perror("accept");
395 #endif
396                 return(0);
397                 }
398
399 /*
400         ling.l_onoff=1;
401         ling.l_linger=0;
402         i=setsockopt(ret,SOL_SOCKET,SO_LINGER,(char *)&ling,sizeof(ling));
403         if (i < 0) { perror("linger"); return(0); }
404         i=0;
405         i=setsockopt(ret,SOL_SOCKET,SO_KEEPALIVE,(char *)&i,sizeof(i));
406         if (i < 0) { perror("keepalive"); return(0); }
407 */
408
409         if (host == NULL) goto end;
410 #ifndef BIT_FIELD_LIMITS
411         /* I should use WSAAsyncGetHostByName() under windows */
412         h1=gethostbyaddr((char *)&from.sin_addr.s_addr,
413                 sizeof(from.sin_addr.s_addr),AF_INET);
414 #else
415         h1=gethostbyaddr((char *)&from.sin_addr,
416                 sizeof(struct in_addr),AF_INET);
417 #endif
418         if (h1 == NULL)
419                 {
420                 BIO_printf(bio_err,"bad gethostbyaddr\n");
421                 *host=NULL;
422                 /* return(0); */
423                 }
424         else
425                 {
426                 if ((*host=(char *)OPENSSL_malloc(strlen(h1->h_name)+1)) == NULL)
427                         {
428                         perror("OPENSSL_malloc");
429                         return(0);
430                         }
431                 BUF_strlcpy(*host,h1->h_name,strlen(h1->h_name)+1);
432
433                 h2=GetHostByName(*host);
434                 if (h2 == NULL)
435                         {
436                         BIO_printf(bio_err,"gethostbyname failure\n");
437                         return(0);
438                         }
439                 i=0;
440                 if (h2->h_addrtype != AF_INET)
441                         {
442                         BIO_printf(bio_err,"gethostbyname addr is not AF_INET\n");
443                         return(0);
444                         }
445                 }
446 end:
447         *sock=ret;
448         return(1);
449         }
450
451 int extract_host_port(char *str, char **host_ptr, unsigned char *ip,
452              short *port_ptr)
453         {
454         char *h,*p;
455
456         h=str;
457         p=strchr(str,':');
458         if (p == NULL)
459                 {
460                 BIO_printf(bio_err,"no port defined\n");
461                 return(0);
462                 }
463         *(p++)='\0';
464
465         if ((ip != NULL) && !host_ip(str,ip))
466                 goto err;
467         if (host_ptr != NULL) *host_ptr=h;
468
469         if (!extract_port(p,port_ptr))
470                 goto err;
471         return(1);
472 err:
473         return(0);
474         }
475
476 static int host_ip(char *str, unsigned char ip[4])
477         {
478         unsigned int in[4]; 
479         int i;
480
481         if (sscanf(str,"%u.%u.%u.%u",&(in[0]),&(in[1]),&(in[2]),&(in[3])) == 4)
482                 {
483                 for (i=0; i<4; i++)
484                         if (in[i] > 255)
485                                 {
486                                 BIO_printf(bio_err,"invalid IP address\n");
487                                 goto err;
488                                 }
489                 ip[0]=in[0];
490                 ip[1]=in[1];
491                 ip[2]=in[2];
492                 ip[3]=in[3];
493                 }
494         else
495                 { /* do a gethostbyname */
496                 struct hostent *he;
497
498                 if (!ssl_sock_init()) return(0);
499
500                 he=GetHostByName(str);
501                 if (he == NULL)
502                         {
503                         BIO_printf(bio_err,"gethostbyname failure\n");
504                         goto err;
505                         }
506                 /* cast to short because of win16 winsock definition */
507                 if ((short)he->h_addrtype != AF_INET)
508                         {
509                         BIO_printf(bio_err,"gethostbyname addr is not AF_INET\n");
510                         return(0);
511                         }
512                 ip[0]=he->h_addr_list[0][0];
513                 ip[1]=he->h_addr_list[0][1];
514                 ip[2]=he->h_addr_list[0][2];
515                 ip[3]=he->h_addr_list[0][3];
516                 }
517         return(1);
518 err:
519         return(0);
520         }
521
522 int extract_port(char *str, short *port_ptr)
523         {
524         int i;
525         struct servent *s;
526
527         i=atoi(str);
528         if (i != 0)
529                 *port_ptr=(unsigned short)i;
530         else
531                 {
532                 s=getservbyname(str,"tcp");
533                 if (s == NULL)
534                         {
535                         BIO_printf(bio_err,"getservbyname failure for %s\n",str);
536                         return(0);
537                         }
538                 *port_ptr=ntohs((unsigned short)s->s_port);
539                 }
540         return(1);
541         }
542
543 #define GHBN_NUM        4
544 static struct ghbn_cache_st
545         {
546         char name[128];
547         struct hostent ent;
548         unsigned long order;
549         } ghbn_cache[GHBN_NUM];
550
551 static unsigned long ghbn_hits=0L;
552 static unsigned long ghbn_miss=0L;
553
554 static struct hostent *GetHostByName(char *name)
555         {
556         struct hostent *ret;
557         int i,lowi=0;
558         unsigned long low= (unsigned long)-1;
559
560         for (i=0; i<GHBN_NUM; i++)
561                 {
562                 if (low > ghbn_cache[i].order)
563                         {
564                         low=ghbn_cache[i].order;
565                         lowi=i;
566                         }
567                 if (ghbn_cache[i].order > 0)
568                         {
569                         if (strncmp(name,ghbn_cache[i].name,128) == 0)
570                                 break;
571                         }
572                 }
573         if (i == GHBN_NUM) /* no hit*/
574                 {
575                 ghbn_miss++;
576                 ret=gethostbyname(name);
577                 if (ret == NULL) return(NULL);
578                 /* else add to cache */
579                 if(strlen(name) < sizeof ghbn_cache[0].name)
580                         {
581                         strcpy(ghbn_cache[lowi].name,name);
582                         memcpy((char *)&(ghbn_cache[lowi].ent),ret,sizeof(struct hostent));
583                         ghbn_cache[lowi].order=ghbn_miss+ghbn_hits;
584                         }
585                 return(ret);
586                 }
587         else
588                 {
589                 ghbn_hits++;
590                 ret= &(ghbn_cache[i].ent);
591                 ghbn_cache[i].order=ghbn_miss+ghbn_hits;
592                 return(ret);
593                 }
594         }
595
596 #endif