use consistent indentation
[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(VMS) && defined(__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 static struct hostent *GetHostByName(char *name);
83 #ifdef WINDOWS
84 static void sock_cleanup(void);
85 #endif
86 static int sock_init(void);
87 static int init_client_ip(int *sock,unsigned char ip[4], int port);
88 static int init_server(int *sock, int port);
89 static int init_server_long(int *sock, int port,char *ip);
90 static int do_accept(int acc_sock, int *sock, char **host);
91 static int host_ip(char *str, unsigned char ip[4]);
92
93 #ifdef WIN16
94 #define SOCKET_PROTOCOL 0 /* more microsoft stupidity */
95 #else
96 #define SOCKET_PROTOCOL IPPROTO_TCP
97 #endif
98
99 #ifdef WINDOWS
100 static struct WSAData wsa_state;
101 static int wsa_init_done=0;
102
103 #ifdef WIN16
104 static HWND topWnd=0;
105 static FARPROC lpTopWndProc=NULL;
106 static FARPROC lpTopHookProc=NULL;
107 extern HINSTANCE _hInstance;  /* nice global CRT provides */
108
109 static LONG FAR PASCAL topHookProc(HWND hwnd, UINT message, WPARAM wParam,
110              LPARAM lParam)
111         {
112         if (hwnd == topWnd)
113                 {
114                 switch(message)
115                         {
116                 case WM_DESTROY:
117                 case WM_CLOSE:
118                         SetWindowLong(topWnd,GWL_WNDPROC,(LONG)lpTopWndProc);
119                         sock_cleanup();
120                         break;
121                         }
122                 }
123         return CallWindowProc(lpTopWndProc,hwnd,message,wParam,lParam);
124         }
125
126 static BOOL CALLBACK enumproc(HWND hwnd,LPARAM lParam)
127         {
128         topWnd=hwnd;
129         return(FALSE);
130         }
131
132 #endif /* WIN32 */
133 #endif /* WINDOWS */
134
135 #ifdef WINDOWS
136 static void sock_cleanup(void)
137         {
138         if (wsa_init_done)
139                 {
140                 wsa_init_done=0;
141                 WSACancelBlockingCall();
142                 WSACleanup();
143                 }
144         }
145 #endif
146
147 static int sock_init(void)
148         {
149 #ifdef WINDOWS
150         if (!wsa_init_done)
151                 {
152                 int err;
153           
154 #ifdef SIGINT
155                 signal(SIGINT,(void (*)(int))sock_cleanup);
156 #endif
157                 wsa_init_done=1;
158                 memset(&wsa_state,0,sizeof(wsa_state));
159                 if (WSAStartup(0x0101,&wsa_state)!=0)
160                         {
161                         err=WSAGetLastError();
162                         BIO_printf(bio_err,"unable to start WINSOCK, error code=%d\n",err);
163                         return(0);
164                         }
165
166 #ifdef WIN16
167                 EnumTaskWindows(GetCurrentTask(),enumproc,0L);
168                 lpTopWndProc=(FARPROC)GetWindowLong(topWnd,GWL_WNDPROC);
169                 lpTopHookProc=MakeProcInstance((FARPROC)topHookProc,_hInstance);
170
171                 SetWindowLong(topWnd,GWL_WNDPROC,(LONG)lpTopHookProc);
172 #endif /* WIN16 */
173                 }
174 #endif /* WINDOWS */
175         return(1);
176         }
177
178 int init_client(int *sock, char *host, int port)
179         {
180         unsigned char ip[4];
181         short p=0;
182
183         if (!host_ip(host,&(ip[0])))
184                 {
185                 return(0);
186                 }
187         if (p != 0) port=p;
188         return(init_client_ip(sock,ip,port));
189         }
190
191 static int init_client_ip(int *sock, unsigned char ip[4], int port)
192         {
193         unsigned long addr;
194         struct sockaddr_in them;
195         int s,i;
196
197         if (!sock_init()) return(0);
198
199         memset((char *)&them,0,sizeof(them));
200         them.sin_family=AF_INET;
201         them.sin_port=htons((unsigned short)port);
202         addr=(unsigned long)
203                 ((unsigned long)ip[0]<<24L)|
204                 ((unsigned long)ip[1]<<16L)|
205                 ((unsigned long)ip[2]<< 8L)|
206                 ((unsigned long)ip[3]);
207         them.sin_addr.s_addr=htonl(addr);
208
209         s=socket(AF_INET,SOCK_STREAM,SOCKET_PROTOCOL);
210         if (s == INVALID_SOCKET) { perror("socket"); return(0); }
211
212         i=0;
213         i=setsockopt(s,SOL_SOCKET,SO_KEEPALIVE,(char *)&i,sizeof(i));
214         if (i < 0) { perror("keepalive"); return(0); }
215
216         if (connect(s,(struct sockaddr *)&them,sizeof(them)) == -1)
217                 { close(s); perror("connect"); return(0); }
218         *sock=s;
219         return(1);
220         }
221
222 int do_server(int port, int *ret, int (*cb)(), char *context)
223         {
224         int sock;
225         char *name;
226         int accept_socket;
227         int i;
228
229         if (!init_server(&accept_socket,port)) return(0);
230
231         if (ret != NULL)
232                 {
233                 *ret=accept_socket;
234                 /* return(1);*/
235                 }
236         for (;;)
237                 {
238                 if (do_accept(accept_socket,&sock,&name) == 0)
239                         {
240                         SHUTDOWN(accept_socket);
241                         return(0);
242                         }
243                 i=(*cb)(name,sock, context);
244                 if (name != NULL) OPENSSL_free(name);
245                 SHUTDOWN2(sock);
246                 if (i < 0)
247                         {
248                         SHUTDOWN2(accept_socket);
249                         return(i);
250                         }
251                 }
252         }
253
254 static int init_server_long(int *sock, int port, char *ip)
255         {
256         int ret=0;
257         struct sockaddr_in server;
258         int s= -1,i;
259
260         if (!sock_init()) return(0);
261
262         memset((char *)&server,0,sizeof(server));
263         server.sin_family=AF_INET;
264         server.sin_port=htons((unsigned short)port);
265         if (ip == NULL)
266                 server.sin_addr.s_addr=INADDR_ANY;
267         else
268 /* Added for T3E, address-of fails on bit field (beckman@acl.lanl.gov) */
269 #ifndef BIT_FIELD_LIMITS
270                 memcpy(&server.sin_addr.s_addr,ip,4);
271 #else
272                 memcpy(&server.sin_addr,ip,4);
273 #endif
274         s=socket(AF_INET,SOCK_STREAM,SOCKET_PROTOCOL);
275
276         if (s == INVALID_SOCKET) goto err;
277 #if defined SOL_SOCKET && defined SO_REUSEADDR
278                 {
279                 int j = 1;
280                 setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
281                            (void *) &j, sizeof j);
282                 }
283 #endif
284         if (bind(s,(struct sockaddr *)&server,sizeof(server)) == -1)
285                 {
286 #ifndef WINDOWS
287                 perror("bind");
288 #endif
289                 goto err;
290                 }
291         /* Make it 128 for linux */
292         if (listen(s,128) == -1) goto err;
293         i=0;
294         *sock=s;
295         ret=1;
296 err:
297         if ((ret == 0) && (s != -1))
298                 {
299                 SHUTDOWN(s);
300                 }
301         return(ret);
302         }
303
304 static int init_server(int *sock, int port)
305         {
306         return(init_server_long(sock, port, NULL));
307         }
308
309 static int do_accept(int acc_sock, int *sock, char **host)
310         {
311         int ret,i;
312         struct hostent *h1,*h2;
313         static struct sockaddr_in from;
314         int len;
315 /*      struct linger ling; */
316
317         if (!sock_init()) return(0);
318
319 #ifndef WINDOWS
320 redoit:
321 #endif
322
323         memset((char *)&from,0,sizeof(from));
324         len=sizeof(from);
325         /* Note: under VMS with SOCKETSHR the fourth parameter is currently
326          * of type (int *) whereas under other systems it is (void *) if
327          * you don't have a cast it will choke the compiler: if you do
328          * have a cast then you can either go for (int *) or (void *).
329          */
330         ret=accept(acc_sock,(struct sockaddr *)&from,(void *)&len);
331         if (ret == INVALID_SOCKET)
332                 {
333 #ifdef WINDOWS
334                 i=WSAGetLastError();
335                 BIO_printf(bio_err,"accept error %d\n",i);
336 #else
337                 if (errno == EINTR)
338                         {
339                         /*check_timeout(); */
340                         goto redoit;
341                         }
342                 fprintf(stderr,"errno=%d ",errno);
343                 perror("accept");
344 #endif
345                 return(0);
346                 }
347
348 /*
349         ling.l_onoff=1;
350         ling.l_linger=0;
351         i=setsockopt(ret,SOL_SOCKET,SO_LINGER,(char *)&ling,sizeof(ling));
352         if (i < 0) { perror("linger"); return(0); }
353         i=0;
354         i=setsockopt(ret,SOL_SOCKET,SO_KEEPALIVE,(char *)&i,sizeof(i));
355         if (i < 0) { perror("keepalive"); return(0); }
356 */
357
358         if (host == NULL) goto end;
359 #ifndef BIT_FIELD_LIMITS
360         /* I should use WSAAsyncGetHostByName() under windows */
361         h1=gethostbyaddr((char *)&from.sin_addr.s_addr,
362                 sizeof(from.sin_addr.s_addr),AF_INET);
363 #else
364         h1=gethostbyaddr((char *)&from.sin_addr,
365                 sizeof(struct in_addr),AF_INET);
366 #endif
367         if (h1 == NULL)
368                 {
369                 BIO_printf(bio_err,"bad gethostbyaddr\n");
370                 *host=NULL;
371                 /* return(0); */
372                 }
373         else
374                 {
375                 if ((*host=(char *)OPENSSL_malloc(strlen(h1->h_name)+1)) == NULL)
376                         {
377                         perror("OPENSSL_malloc");
378                         return(0);
379                         }
380                 strcpy(*host,h1->h_name);
381
382                 h2=GetHostByName(*host);
383                 if (h2 == NULL)
384                         {
385                         BIO_printf(bio_err,"gethostbyname failure\n");
386                         return(0);
387                         }
388                 i=0;
389                 if (h2->h_addrtype != AF_INET)
390                         {
391                         BIO_printf(bio_err,"gethostbyname addr is not AF_INET\n");
392                         return(0);
393                         }
394                 }
395 end:
396         *sock=ret;
397         return(1);
398         }
399
400 int extract_host_port(char *str, char **host_ptr, unsigned char *ip,
401              short *port_ptr)
402         {
403         char *h,*p;
404
405         h=str;
406         p=strchr(str,':');
407         if (p == NULL)
408                 {
409                 BIO_printf(bio_err,"no port defined\n");
410                 return(0);
411                 }
412         *(p++)='\0';
413
414         if ((ip != NULL) && !host_ip(str,ip))
415                 goto err;
416         if (host_ptr != NULL) *host_ptr=h;
417
418         if (!extract_port(p,port_ptr))
419                 goto err;
420         return(1);
421 err:
422         return(0);
423         }
424
425 static int host_ip(char *str, unsigned char ip[4])
426         {
427         unsigned int in[4]; 
428         int i;
429
430         if (sscanf(str,"%u.%u.%u.%u",&(in[0]),&(in[1]),&(in[2]),&(in[3])) == 4)
431                 {
432                 for (i=0; i<4; i++)
433                         if (in[i] > 255)
434                                 {
435                                 BIO_printf(bio_err,"invalid IP address\n");
436                                 goto err;
437                                 }
438                 ip[0]=in[0];
439                 ip[1]=in[1];
440                 ip[2]=in[2];
441                 ip[3]=in[3];
442                 }
443         else
444                 { /* do a gethostbyname */
445                 struct hostent *he;
446
447                 if (!sock_init()) return(0);
448
449                 he=GetHostByName(str);
450                 if (he == NULL)
451                         {
452                         BIO_printf(bio_err,"gethostbyname failure\n");
453                         goto err;
454                         }
455                 /* cast to short because of win16 winsock definition */
456                 if ((short)he->h_addrtype != AF_INET)
457                         {
458                         BIO_printf(bio_err,"gethostbyname addr is not AF_INET\n");
459                         return(0);
460                         }
461                 ip[0]=he->h_addr_list[0][0];
462                 ip[1]=he->h_addr_list[0][1];
463                 ip[2]=he->h_addr_list[0][2];
464                 ip[3]=he->h_addr_list[0][3];
465                 }
466         return(1);
467 err:
468         return(0);
469         }
470
471 int extract_port(char *str, short *port_ptr)
472         {
473         int i;
474         struct servent *s;
475
476         i=atoi(str);
477         if (i != 0)
478                 *port_ptr=(unsigned short)i;
479         else
480                 {
481                 s=getservbyname(str,"tcp");
482                 if (s == NULL)
483                         {
484                         BIO_printf(bio_err,"getservbyname failure for %s\n",str);
485                         return(0);
486                         }
487                 *port_ptr=ntohs((unsigned short)s->s_port);
488                 }
489         return(1);
490         }
491
492 #define GHBN_NUM        4
493 static struct ghbn_cache_st
494         {
495         char name[128];
496         struct hostent ent;
497         unsigned long order;
498         } ghbn_cache[GHBN_NUM];
499
500 static unsigned long ghbn_hits=0L;
501 static unsigned long ghbn_miss=0L;
502
503 static struct hostent *GetHostByName(char *name)
504         {
505         struct hostent *ret;
506         int i,lowi=0;
507         unsigned long low= (unsigned long)-1;
508
509         for (i=0; i<GHBN_NUM; i++)
510                 {
511                 if (low > ghbn_cache[i].order)
512                         {
513                         low=ghbn_cache[i].order;
514                         lowi=i;
515                         }
516                 if (ghbn_cache[i].order > 0)
517                         {
518                         if (strncmp(name,ghbn_cache[i].name,128) == 0)
519                                 break;
520                         }
521                 }
522         if (i == GHBN_NUM) /* no hit*/
523                 {
524                 ghbn_miss++;
525                 ret=gethostbyname(name);
526                 if (ret == NULL) return(NULL);
527                 /* else add to cache */
528                 strncpy(ghbn_cache[lowi].name,name,128);
529                 memcpy((char *)&(ghbn_cache[lowi].ent),ret,sizeof(struct hostent));
530                 ghbn_cache[lowi].order=ghbn_miss+ghbn_hits;
531                 return(ret);
532                 }
533         else
534                 {
535                 ghbn_hits++;
536                 ret= &(ghbn_cache[i].ent);
537                 ghbn_cache[i].order=ghbn_miss+ghbn_hits;
538                 return(ret);
539                 }
540         }