s_socket.c revision 68651
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
71typedef 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
82static struct hostent *GetHostByName(char *name);
83#ifdef WINDOWS
84static void sock_cleanup(void);
85#endif
86static int sock_init(void);
87static int init_client_ip(int *sock,unsigned char ip[4], int port);
88static int init_server(int *sock, int port);
89static int init_server_long(int *sock, int port,char *ip);
90static int do_accept(int acc_sock, int *sock, char **host);
91static 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
100static struct WSAData wsa_state;
101static int wsa_init_done=0;
102
103#ifdef WIN16
104static HWND topWnd=0;
105static FARPROC lpTopWndProc=NULL;
106static FARPROC lpTopHookProc=NULL;
107extern HINSTANCE _hInstance;  /* nice global CRT provides */
108
109static 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
126static 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
136static 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
147static 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
178int 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
191static 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#ifndef MPE
213	i=0;
214	i=setsockopt(s,SOL_SOCKET,SO_KEEPALIVE,(char *)&i,sizeof(i));
215	if (i < 0) { perror("keepalive"); return(0); }
216#endif
217
218	if (connect(s,(struct sockaddr *)&them,sizeof(them)) == -1)
219		{ close(s); perror("connect"); return(0); }
220	*sock=s;
221	return(1);
222	}
223
224int do_server(int port, int *ret, int (*cb)(), char *context)
225	{
226	int sock;
227	char *name;
228	int accept_socket;
229	int i;
230
231	if (!init_server(&accept_socket,port)) return(0);
232
233	if (ret != NULL)
234		{
235		*ret=accept_socket;
236		/* return(1);*/
237		}
238	for (;;)
239		{
240		if (do_accept(accept_socket,&sock,&name) == 0)
241			{
242			SHUTDOWN(accept_socket);
243			return(0);
244			}
245		i=(*cb)(name,sock, context);
246		if (name != NULL) OPENSSL_free(name);
247		SHUTDOWN2(sock);
248		if (i < 0)
249			{
250			SHUTDOWN2(accept_socket);
251			return(i);
252			}
253		}
254	}
255
256static int init_server_long(int *sock, int port, char *ip)
257	{
258	int ret=0;
259	struct sockaddr_in server;
260	int s= -1,i;
261
262	if (!sock_init()) return(0);
263
264	memset((char *)&server,0,sizeof(server));
265	server.sin_family=AF_INET;
266	server.sin_port=htons((unsigned short)port);
267	if (ip == NULL)
268		server.sin_addr.s_addr=INADDR_ANY;
269	else
270/* Added for T3E, address-of fails on bit field (beckman@acl.lanl.gov) */
271#ifndef BIT_FIELD_LIMITS
272		memcpy(&server.sin_addr.s_addr,ip,4);
273#else
274		memcpy(&server.sin_addr,ip,4);
275#endif
276	s=socket(AF_INET,SOCK_STREAM,SOCKET_PROTOCOL);
277
278	if (s == INVALID_SOCKET) goto err;
279#if defined SOL_SOCKET && defined SO_REUSEADDR
280		{
281		int j = 1;
282		setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
283			   (void *) &j, sizeof j);
284		}
285#endif
286	if (bind(s,(struct sockaddr *)&server,sizeof(server)) == -1)
287		{
288#ifndef WINDOWS
289		perror("bind");
290#endif
291		goto err;
292		}
293	/* Make it 128 for linux */
294	if (listen(s,128) == -1) goto err;
295	i=0;
296	*sock=s;
297	ret=1;
298err:
299	if ((ret == 0) && (s != -1))
300		{
301		SHUTDOWN(s);
302		}
303	return(ret);
304	}
305
306static int init_server(int *sock, int port)
307	{
308	return(init_server_long(sock, port, NULL));
309	}
310
311static int do_accept(int acc_sock, int *sock, char **host)
312	{
313	int ret,i;
314	struct hostent *h1,*h2;
315	static struct sockaddr_in from;
316	int len;
317/*	struct linger ling; */
318
319	if (!sock_init()) return(0);
320
321#ifndef WINDOWS
322redoit:
323#endif
324
325	memset((char *)&from,0,sizeof(from));
326	len=sizeof(from);
327	/* Note: under VMS with SOCKETSHR the fourth parameter is currently
328	 * of type (int *) whereas under other systems it is (void *) if
329	 * you don't have a cast it will choke the compiler: if you do
330	 * have a cast then you can either go for (int *) or (void *).
331	 */
332	ret=accept(acc_sock,(struct sockaddr *)&from,(void *)&len);
333	if (ret == INVALID_SOCKET)
334		{
335#ifdef WINDOWS
336		i=WSAGetLastError();
337		BIO_printf(bio_err,"accept error %d\n",i);
338#else
339		if (errno == EINTR)
340			{
341			/*check_timeout(); */
342			goto redoit;
343			}
344		fprintf(stderr,"errno=%d ",errno);
345		perror("accept");
346#endif
347		return(0);
348		}
349
350/*
351	ling.l_onoff=1;
352	ling.l_linger=0;
353	i=setsockopt(ret,SOL_SOCKET,SO_LINGER,(char *)&ling,sizeof(ling));
354	if (i < 0) { perror("linger"); return(0); }
355	i=0;
356	i=setsockopt(ret,SOL_SOCKET,SO_KEEPALIVE,(char *)&i,sizeof(i));
357	if (i < 0) { perror("keepalive"); return(0); }
358*/
359
360	if (host == NULL) goto end;
361#ifndef BIT_FIELD_LIMITS
362	/* I should use WSAAsyncGetHostByName() under windows */
363	h1=gethostbyaddr((char *)&from.sin_addr.s_addr,
364		sizeof(from.sin_addr.s_addr),AF_INET);
365#else
366	h1=gethostbyaddr((char *)&from.sin_addr,
367		sizeof(struct in_addr),AF_INET);
368#endif
369	if (h1 == NULL)
370		{
371		BIO_printf(bio_err,"bad gethostbyaddr\n");
372		*host=NULL;
373		/* return(0); */
374		}
375	else
376		{
377		if ((*host=(char *)OPENSSL_malloc(strlen(h1->h_name)+1)) == NULL)
378			{
379			perror("OPENSSL_malloc");
380			return(0);
381			}
382		strcpy(*host,h1->h_name);
383
384		h2=GetHostByName(*host);
385		if (h2 == NULL)
386			{
387			BIO_printf(bio_err,"gethostbyname failure\n");
388			return(0);
389			}
390		i=0;
391		if (h2->h_addrtype != AF_INET)
392			{
393			BIO_printf(bio_err,"gethostbyname addr is not AF_INET\n");
394			return(0);
395			}
396		}
397end:
398	*sock=ret;
399	return(1);
400	}
401
402int extract_host_port(char *str, char **host_ptr, unsigned char *ip,
403	     short *port_ptr)
404	{
405	char *h,*p;
406
407	h=str;
408	p=strchr(str,':');
409	if (p == NULL)
410		{
411		BIO_printf(bio_err,"no port defined\n");
412		return(0);
413		}
414	*(p++)='\0';
415
416	if ((ip != NULL) && !host_ip(str,ip))
417		goto err;
418	if (host_ptr != NULL) *host_ptr=h;
419
420	if (!extract_port(p,port_ptr))
421		goto err;
422	return(1);
423err:
424	return(0);
425	}
426
427static int host_ip(char *str, unsigned char ip[4])
428	{
429	unsigned int in[4];
430	int i;
431
432	if (sscanf(str,"%u.%u.%u.%u",&(in[0]),&(in[1]),&(in[2]),&(in[3])) == 4)
433		{
434		for (i=0; i<4; i++)
435			if (in[i] > 255)
436				{
437				BIO_printf(bio_err,"invalid IP address\n");
438				goto err;
439				}
440		ip[0]=in[0];
441		ip[1]=in[1];
442		ip[2]=in[2];
443		ip[3]=in[3];
444		}
445	else
446		{ /* do a gethostbyname */
447		struct hostent *he;
448
449		if (!sock_init()) return(0);
450
451		he=GetHostByName(str);
452		if (he == NULL)
453			{
454			BIO_printf(bio_err,"gethostbyname failure\n");
455			goto err;
456			}
457		/* cast to short because of win16 winsock definition */
458		if ((short)he->h_addrtype != AF_INET)
459			{
460			BIO_printf(bio_err,"gethostbyname addr is not AF_INET\n");
461			return(0);
462			}
463		ip[0]=he->h_addr_list[0][0];
464		ip[1]=he->h_addr_list[0][1];
465		ip[2]=he->h_addr_list[0][2];
466		ip[3]=he->h_addr_list[0][3];
467		}
468	return(1);
469err:
470	return(0);
471	}
472
473int extract_port(char *str, short *port_ptr)
474	{
475	int i;
476	struct servent *s;
477
478	i=atoi(str);
479	if (i != 0)
480		*port_ptr=(unsigned short)i;
481	else
482		{
483		s=getservbyname(str,"tcp");
484		if (s == NULL)
485			{
486			BIO_printf(bio_err,"getservbyname failure for %s\n",str);
487			return(0);
488			}
489		*port_ptr=ntohs((unsigned short)s->s_port);
490		}
491	return(1);
492	}
493
494#define GHBN_NUM	4
495static struct ghbn_cache_st
496	{
497	char name[128];
498	struct hostent ent;
499	unsigned long order;
500	} ghbn_cache[GHBN_NUM];
501
502static unsigned long ghbn_hits=0L;
503static unsigned long ghbn_miss=0L;
504
505static struct hostent *GetHostByName(char *name)
506	{
507	struct hostent *ret;
508	int i,lowi=0;
509	unsigned long low= (unsigned long)-1;
510
511	for (i=0; i<GHBN_NUM; i++)
512		{
513		if (low > ghbn_cache[i].order)
514			{
515			low=ghbn_cache[i].order;
516			lowi=i;
517			}
518		if (ghbn_cache[i].order > 0)
519			{
520			if (strncmp(name,ghbn_cache[i].name,128) == 0)
521				break;
522			}
523		}
524	if (i == GHBN_NUM) /* no hit*/
525		{
526		ghbn_miss++;
527		ret=gethostbyname(name);
528		if (ret == NULL) return(NULL);
529		/* else add to cache */
530		strncpy(ghbn_cache[lowi].name,name,128);
531		memcpy((char *)&(ghbn_cache[lowi].ent),ret,sizeof(struct hostent));
532		ghbn_cache[lowi].order=ghbn_miss+ghbn_hits;
533		return(ret);
534		}
535	else
536		{
537		ghbn_hits++;
538		ret= &(ghbn_cache[i].ent);
539		ghbn_cache[i].order=ghbn_miss+ghbn_hits;
540		return(ret);
541		}
542	}
543