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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [librpc/] [src/] [rpc/] [auth_time.c] - Blame information for rev 173

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#pragma ident   "@(#)auth_time.c        1.4     92/11/10 SMI"
2
 
3
/*
4
 *      auth_time.c
5
 *
6
 * This module contains the private function __rpc_get_time_offset()
7
 * which will return the difference in seconds between the local system's
8
 * notion of time and a remote server's notion of time. This must be
9
 * possible without calling any functions that may invoke the name
10
 * service. (netdir_getbyxxx, getXbyY, etc). The function is used in the
11
 * synchronize call of the authdes code to synchronize clocks between
12
 * NIS+ clients and their servers.
13
 *
14
 * Note to minimize the amount of duplicate code, portions of the
15
 * synchronize() function were folded into this code, and the synchronize
16
 * call becomes simply a wrapper around this function. Further, if this
17
 * function is called with a timehost it *DOES* recurse to the name
18
 * server so don't use it in that mode if you are doing name service code.
19
 *
20
 *      Copyright (c) 1992 Sun Microsystems Inc.
21
 *      All rights reserved.
22
 *
23
 * Side effects :
24
 *      When called a client handle to a RPCBIND process is created
25
 *      and destroyed. Two strings "netid" and "uaddr" are malloc'd
26
 *      and returned. The SIGALRM processing is modified only if
27
 *      needed to deal with TCP connections.
28
 *
29
 * NOTE: This code has had the crap beaten out it in order to convert
30
 *       it from TI-RPC back to TD-RPC for use on FreeBSD.
31
 *
32
 * $FreeBSD: src/lib/libc/rpc/auth_time.c,v 1.4 2000/01/27 23:06:35 jasone Exp $
33
 */
34
#include <stdio.h>
35
#include <syslog.h>
36
#include <string.h>
37
#include <stdlib.h>
38
#include <unistd.h>
39
#include <netdb.h>
40
#include <sys/signal.h>
41
#include <sys/errno.h>
42
#include <sys/socket.h>
43
#include <netinet/in.h>
44
#include <arpa/inet.h>
45
#include <rpc/rpc.h>
46
#include <rpc/rpc_com.h>
47
#undef NIS
48
#include <rpcsvc/nis.h>
49
 
50
/*
51
 * FreeBSD currently uses RPC 4.0, which uses portmap rather than
52
 * rpcbind. Consequently, we need to fake up these values here.
53
 * Luckily, the RPCB_GETTIME procedure uses only base XDR data types
54
 * so we don't need anything besides these magic numbers.
55
 */
56
#define RPCBPROG (u_long)100000
57
#define RPCBVERS (u_long)3
58
#define RPCBPROC_GETTIME (u_long)6
59
 
60
#ifdef TESTING
61
#define msg(x)  printf("ERROR: %s\n", x)
62
/* #define msg(x) syslog(LOG_ERR, "%s", x) */
63
#else
64
#define msg(x)
65
#endif
66
 
67
static int saw_alarm = 0;
68
 
69
static void
70
alarm_hndler(s)
71
        int     s;
72
{
73
        saw_alarm = 1;
74
        return;
75
}
76
 
77
/*
78
 * The internet time server defines the epoch to be Jan 1, 1900
79
 * whereas UNIX defines it to be Jan 1, 1970. To adjust the result
80
 * from internet time-service time, into UNIX time we subtract the
81
 * following offset :
82
 */
83
#define NYEARS  (1970 - 1900)
84
#define TOFFSET ((u_long)60*60*24*(365*NYEARS + (NYEARS/4)))
85
 
86
 
87
/*
88
 * Stolen from rpc.nisd:
89
 * Turn a 'universal address' into a struct sockaddr_in.
90
 * Bletch.
91
 */
92
static int uaddr_to_sockaddr(uaddr, sin)
93
#ifdef foo
94
        endpoint                *endpt;
95
#endif
96
        char                    *uaddr;
97
        struct sockaddr_in      *sin;
98
{
99
        unsigned char           p_bytes[2];
100
        int                     i;
101
        unsigned long           a[6];
102
 
103
        i = sscanf(uaddr, "%lu.%lu.%lu.%lu.%lu.%lu", &a[0], &a[1], &a[2],
104
                                                &a[3], &a[4], &a[5]);
105
 
106
        if (i < 6)
107
                return(1);
108
 
109
        for (i = 0; i < 4; i++)
110
                sin->sin_addr.s_addr |= (a[i] & 0x000000FF) << (8 * i);
111
 
112
        p_bytes[0] = (unsigned char)a[4] & 0x000000FF;
113
        p_bytes[1] = (unsigned char)a[5] & 0x000000FF;
114
 
115
        sin->sin_family = AF_INET; /* always */
116
        bcopy((char *)&p_bytes, (char *)&sin->sin_port, 2);
117
 
118
        return (0);
119
}
120
 
121
/*
122
 * free_eps()
123
 *
124
 * Free the strings that were strduped into the eps structure.
125
 */
126
static void
127
free_eps(eps, num)
128
        endpoint        eps[];
129
        int             num;
130
{
131
        int             i;
132
 
133
        for (i = 0; i < num; i++) {
134
                free(eps[i].uaddr);
135
                free(eps[i].proto);
136
                free(eps[i].family);
137
        }
138
        return;
139
}
140
 
141
/*
142
 * get_server()
143
 *
144
 * This function constructs a nis_server structure description for the
145
 * indicated hostname.
146
 *
147
 * NOTE: There is a chance we may end up recursing here due to the
148
 * fact that gethostbyname() could do an NIS search. Ideally, the
149
 * NIS+ server will call __rpc_get_time_offset() with the nis_server
150
 * structure already populated.
151
 */
152
static nis_server *
153
get_server(sin, host, srv, eps, maxep)
154
        struct sockaddr_in *sin;
155
        char            *host;  /* name of the time host        */
156
        nis_server      *srv;   /* nis_server struct to use.    */
157
        endpoint        eps[];  /* array of endpoints           */
158
        int             maxep;  /* max array size               */
159
{
160
        char                    hname[256];
161
        int                     num_ep = 0, i;
162
        struct hostent          *he;
163
        struct hostent          dummy;
164
        char                    *ptr[2];
165
 
166
        if (host == NULL && sin == NULL)
167
                return (NULL);
168
 
169
        if (sin == NULL) {
170
                he = gethostbyname(host);
171
                if (he == NULL)
172
                        return(NULL);
173
        } else {
174
                he = &dummy;
175
                ptr[0] = (char *)&sin->sin_addr.s_addr;
176
                ptr[1] = NULL;
177
                dummy.h_addr_list = ptr;
178
        }
179
 
180
        /*
181
         * This is lame. We go around once for TCP, then again
182
         * for UDP.
183
         */
184
        for (i = 0; (he->h_addr_list[i] != NULL) && (num_ep < maxep);
185
                                                i++, num_ep++) {
186
                struct in_addr *a;
187
 
188
                a = (struct in_addr *)he->h_addr_list[i];
189
                snprintf(hname, sizeof(hname), "%s.0.111", inet_ntoa(*a));
190
                eps[num_ep].uaddr = strdup(hname);
191
                eps[num_ep].family = strdup("inet");
192
                eps[num_ep].proto =  strdup("tcp");
193
        }
194
 
195
        for (i = 0; (he->h_addr_list[i] != NULL) && (num_ep < maxep);
196
                                                i++, num_ep++) {
197
                struct in_addr *a;
198
 
199
                a = (struct in_addr *)he->h_addr_list[i];
200
                snprintf(hname, sizeof(hname), "%s.0.111", inet_ntoa(*a));
201
                eps[num_ep].uaddr = strdup(hname);
202
                eps[num_ep].family = strdup("inet");
203
                eps[num_ep].proto =  strdup("udp");
204
        }
205
 
206
        srv->name = (nis_name) host;
207
        srv->ep.ep_len = num_ep;
208
        srv->ep.ep_val = eps;
209
        srv->key_type = NIS_PK_NONE;
210
        srv->pkey.n_bytes = NULL;
211
        srv->pkey.n_len = 0;
212
        return (srv);
213
}
214
 
215
/*
216
 * __rpc_get_time_offset()
217
 *
218
 * This function uses a nis_server structure to contact the a remote
219
 * machine (as named in that structure) and returns the offset in time
220
 * between that machine and this one. This offset is returned in seconds
221
 * and may be positive or negative.
222
 *
223
 * The first time through, a lot of fiddling is done with the netconfig
224
 * stuff to find a suitable transport. The function is very aggressive
225
 * about choosing UDP or at worst TCP if it can. This is because
226
 * those transports support both the RCPBIND call and the internet
227
 * time service.
228
 *
229
 * Once through, *uaddr is set to the universal address of
230
 * the machine and *netid is set to the local netid for the transport
231
 * that uaddr goes with. On the second call, the netconfig stuff
232
 * is skipped and the uaddr/netid pair are used to fetch the netconfig
233
 * structure and to then contact the machine for the time.
234
 *
235
 * td = "server" - "client"
236
 */
237
int
238
__rpc_get_time_offset(td, srv, thost, uaddr, netid)
239
        struct timeval  *td;     /* Time difference                     */
240
        nis_server      *srv;    /* NIS Server description              */
241
        char            *thost;  /* if no server, this is the timehost  */
242
        char            **uaddr; /* known universal address             */
243
        struct sockaddr_in *netid; /* known network identifier          */
244
{
245
        CLIENT                  *clnt;          /* Client handle        */
246
        endpoint                *ep,            /* useful endpoints     */
247
                                *useep = NULL;  /* endpoint of xp       */
248
        char                    *useua = NULL;  /* uaddr of selected xp */
249
        int                     epl, i;         /* counters             */
250
        enum clnt_stat          status;         /* result of clnt_call  */
251
        u_long                  thetime, delta;
252
        int                     needfree = 0;
253
        struct timeval          tv;
254
        int                     time_valid;
255
        int                     udp_ep = -1, tcp_ep = -1;
256
        int                     a1, a2, a3, a4;
257
        char                    ut[64], ipuaddr[64];
258
        endpoint                teps[32];
259
        nis_server              tsrv;
260
        void                    (*oldsig)() = NULL; /* old alarm handler */
261
        struct sockaddr_in      sin;
262
        int                     s = RPC_ANYSOCK, len;
263
        int                     type = 0;
264
 
265
        td->tv_sec = 0;
266
        td->tv_usec = 0;
267
 
268
        /*
269
         * First check to see if we need to find and address for this
270
         * server.
271
         */
272
        if (*uaddr == NULL) {
273
                if ((srv != NULL) && (thost != NULL)) {
274
                        msg("both timehost and srv pointer used!");
275
                        return (0);
276
                }
277
                if (! srv) {
278
                        srv = get_server(netid, thost, &tsrv, teps, 32);
279
                        if (srv == NULL) {
280
                                msg("unable to contruct server data.");
281
                                return (0);
282
                        }
283
                        needfree = 1;   /* need to free data in endpoints */
284
                }
285
 
286
                ep = srv->ep.ep_val;
287
                epl = srv->ep.ep_len;
288
 
289
                /* Identify the TCP and UDP endpoints */
290
                for (i = 0;
291
                        (i < epl) && ((udp_ep == -1) || (tcp_ep == -1)); i++) {
292
                        if (strcasecmp(ep[i].proto, "udp") == 0)
293
                                udp_ep = i;
294
                        if (strcasecmp(ep[i].proto, "tcp") == 0)
295
                                tcp_ep = i;
296
                }
297
 
298
                /* Check to see if it is UDP or TCP */
299
                if (tcp_ep > -1) {
300
                        useep = &ep[tcp_ep];
301
                        useua = ep[tcp_ep].uaddr;
302
                        type = SOCK_STREAM;
303
                } else if (udp_ep > -1) {
304
                        useep = &ep[udp_ep];
305
                        useua = ep[udp_ep].uaddr;
306
                        type = SOCK_DGRAM;
307
                }
308
 
309
                if (useep == NULL) {
310
                        msg("no acceptable transport endpoints.");
311
                        if (needfree)
312
                                free_eps(teps, tsrv.ep.ep_len);
313
                        return (0);
314
                }
315
        }
316
 
317
        /*
318
         * Create a sockaddr from the uaddr.
319
         */
320
        if (*uaddr != NULL)
321
                useua = *uaddr;
322
 
323
        /* Fixup test for NIS+ */
324
        sscanf(useua, "%d.%d.%d.%d.", &a1, &a2, &a3, &a4);
325
        sprintf(ipuaddr, "%d.%d.%d.%d.0.111", a1, a2, a3, a4);
326
        useua = &ipuaddr[0];
327
 
328
        bzero((char *)&sin, sizeof(sin));
329
        if (uaddr_to_sockaddr(useua, &sin)) {
330
                msg("unable to translate uaddr to sockaddr.");
331
                if (needfree)
332
                        free_eps(teps, tsrv.ep.ep_len);
333
                return (0);
334
        }
335
 
336
        /*
337
         * Create the client handle to rpcbind. Note we always try
338
         * version 3 since that is the earliest version that supports
339
         * the RPCB_GETTIME call. Also it is the version that comes
340
         * standard with SVR4. Since most everyone supports TCP/IP
341
         * we could consider trying the rtime call first.
342
         */
343
        clnt = clnttcp_create(&sin, RPCBPROG, RPCBVERS, &s, 0, 0);
344
        if (clnt == NULL) {
345
                msg("unable to create client handle to rpcbind.");
346
                if (needfree)
347
                        free_eps(teps, tsrv.ep.ep_len);
348
                return (0);
349
        }
350
 
351
        tv.tv_sec = 5;
352
        tv.tv_usec = 0;
353
        time_valid = 0;
354
        status = clnt_call(clnt, RPCBPROC_GETTIME, xdr_void, NULL,
355
                                        xdr_u_long, (char *)&thetime, tv);
356
        /*
357
         * The only error we check for is anything but success. In
358
         * fact we could have seen PROGMISMATCH if talking to a 4.1
359
         * machine (pmap v2) or TIMEDOUT if the net was busy.
360
         */
361
        if (status == RPC_SUCCESS)
362
                time_valid = 1;
363
        else {
364
                int save;
365
 
366
                /* Blow away possible stale CLNT handle. */
367
                if (clnt != NULL) {
368
                        clnt_destroy(clnt);
369
                        clnt = NULL;
370
                }
371
 
372
                /*
373
                 * Convert PMAP address into timeservice address
374
                 * We take advantage of the fact that we "know" what
375
                 * the universal address looks like for inet transports.
376
                 *
377
                 * We also know that the internet timeservice is always
378
                 * listening on port 37.
379
                 */
380
                sscanf(useua, "%d.%d.%d.%d.", &a1, &a2, &a3, &a4);
381
                sprintf(ut, "%d.%d.%d.%d.0.37", a1, a2, a3, a4);
382
 
383
                if (uaddr_to_sockaddr(ut, &sin)) {
384
                        msg("cannot convert timeservice uaddr to sockaddr.");
385
                        goto error;
386
                }
387
 
388
                s = socket(AF_INET, type, 0);
389
                if (s == -1) {
390
                        msg("unable to open fd to network.");
391
                        goto error;
392
                }
393
 
394
                /*
395
                 * Now depending on whether or not we're talking to
396
                 * UDP we set a timeout or not.
397
                 */
398
                if (type == SOCK_DGRAM) {
399
                        struct timeval timeout = { 20, 0 };
400
                        struct sockaddr_in from;
401
                        fd_set readfds;
402
                        int res;
403
 
404
                        if (sendto(s, &thetime, sizeof(thetime), 0,
405
                                (struct sockaddr *)&sin, sizeof(sin)) == -1) {
406
                                msg("udp : sendto failed.");
407
                                goto error;
408
                        }
409
                        do {
410
                                FD_ZERO(&readfds);
411
                                FD_SET(s, &readfds);
412
                                res = select(_rpc_dtablesize(), &readfds,
413
                                     (fd_set *)NULL, (fd_set *)NULL, &timeout);
414
                        } while (res < 0 && errno == EINTR);
415
                        if (res <= 0)
416
                                goto error;
417
                        len = sizeof(from);
418
                        res = recvfrom(s, (char *)&thetime, sizeof(thetime), 0,
419
                                       (struct sockaddr *)&from, &len);
420
                        if (res == -1) {
421
                                msg("recvfrom failed on udp transport.");
422
                                goto error;
423
                        }
424
                        time_valid = 1;
425
                } else {
426
                        int res;
427
 
428
                        oldsig = (void (*)())signal(SIGALRM, alarm_hndler);
429
                        saw_alarm = 0; /* global tracking the alarm */
430
                        alarm(20); /* only wait 20 seconds */
431
                        res = connect(s, (struct sockaddr *)&sin, sizeof(sin));
432
                        if (res == -1) {
433
                                msg("failed to connect to tcp endpoint.");
434
                                goto error;
435
                        }
436
                        if (saw_alarm) {
437
                                msg("alarm caught it, must be unreachable.");
438
                                goto error;
439
                        }
440
                        res = _read(s, (char *)&thetime, sizeof(thetime));
441
                        if (res != sizeof(thetime)) {
442
                                if (saw_alarm)
443
                                        msg("timed out TCP call.");
444
                                else
445
                                        msg("wrong size of results returned");
446
 
447
                                goto error;
448
                        }
449
                        time_valid = 1;
450
                }
451
                save = errno;
452
                (void)_close(s);
453
                errno = save;
454
                s = RPC_ANYSOCK;
455
 
456
                if (time_valid) {
457
                        thetime = ntohl(thetime);
458
                        thetime = thetime - TOFFSET; /* adjust to UNIX time */
459
                } else
460
                        thetime = 0;
461
        }
462
 
463
        gettimeofday(&tv, 0);
464
 
465
error:
466
        /*
467
         * clean up our allocated data structures.
468
         */
469
 
470
        if (s != RPC_ANYSOCK)
471
                (void)_close(s);
472
 
473
        if (clnt != NULL)
474
                clnt_destroy(clnt);
475
 
476
        alarm(0);        /* reset that alarm if its outstanding */
477
        if (oldsig) {
478
                signal(SIGALRM, oldsig);
479
        }
480
 
481
        /*
482
         * note, don't free uaddr strings until after we've made a
483
         * copy of them.
484
         */
485
        if (time_valid) {
486
                if (*uaddr == NULL)
487
                        *uaddr = strdup(useua);
488
 
489
                /* Round to the nearest second */
490
                tv.tv_sec += (tv.tv_sec > 500000) ? 1 : 0;
491
                delta = (thetime > tv.tv_sec) ? thetime - tv.tv_sec :
492
                                                tv.tv_sec - thetime;
493
                td->tv_sec = (thetime < tv.tv_sec) ? - delta : delta;
494
                td->tv_usec = 0;
495
        } else {
496
                msg("unable to get the server's time.");
497
        }
498
 
499
        if (needfree)
500
                free_eps(teps, tsrv.ep.ep_len);
501
 
502
        return (time_valid);
503
}

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