GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libc/rpc/xdr_rec.c Lines: 0 303 0.0 %
Date: 2017-11-13 Branches: 0 155 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: xdr_rec.c,v 1.22 2016/09/21 04:38:56 guenther Exp $ */
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3
/*
4
 * Copyright (c) 2010, Oracle America, Inc.
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 *
6
 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions are
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 * met:
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 *
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 *     * Redistributions of source code must retain the above copyright
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 *       notice, this list of conditions and the following disclaimer.
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 *     * Redistributions in binary form must reproduce the above
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 *       copyright notice, this list of conditions and the following
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 *       disclaimer in the documentation and/or other materials
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 *       provided with the distribution.
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 *     * Neither the name of the "Oracle America, Inc." nor the names of its
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 *       contributors may be used to endorse or promote products derived
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 *       from this software without specific prior written permission.
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 *
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 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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 *   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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 *   COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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 *   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 *   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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 *   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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 *   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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 *   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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 *   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
33
34
/*
35
 * xdr_rec.c, Implements TCP/IP based XDR streams with a "record marking"
36
 * layer above tcp (for rpc's use).
37
 *
38
 * These routines interface XDRSTREAMS to a tcp/ip connection.
39
 * There is a record marking layer between the xdr stream
40
 * and the tcp transport level.  A record is composed on one or more
41
 * record fragments.  A record fragment is a thirty-two bit header followed
42
 * by n bytes of data, where n is contained in the header.  The header
43
 * is represented as a htonl(u_int32_t).  The high order bit encodes
44
 * whether or not the fragment is the last fragment of the record
45
 * (1 => fragment is last, 0 => more fragments to follow.
46
 * The other 31 bits encode the byte length of the fragment.
47
 */
48
49
#include <sys/types.h>
50
#include <netinet/in.h>
51
#include <stddef.h>
52
#include <stdio.h>
53
#include <stdlib.h>
54
#include <string.h>
55
#include <unistd.h>
56
#include <rpc/types.h>
57
#include <rpc/xdr.h>
58
#include <rpc/auth.h>
59
#include <rpc/clnt.h>
60
#include <rpc/rpc_msg.h>
61
#include <rpc/svc.h>
62
63
static bool_t	xdrrec_getlong(XDR *, long *);
64
static bool_t	xdrrec_putlong(XDR *, long *);
65
static bool_t	xdrrec_getbytes(XDR *, caddr_t, u_int);
66
static bool_t	xdrrec_putbytes(XDR *, caddr_t, u_int);
67
static u_int	xdrrec_getpos(XDR *);
68
static bool_t	xdrrec_setpos(XDR *, u_int);
69
static int32_t *xdrrec_inline(XDR *, u_int);
70
static void	xdrrec_destroy(XDR *);
71
72
/*
73
 * Not clear if these are used externally
74
 */
75
bool_t	__xdrrec_setnonblock(XDR *, int);
76
PROTO_STD_DEPRECATED(__xdrrec_setnonblock);
77
78
bool_t __xdrrec_getrec(XDR *xdrs, enum xprt_stat *statp, bool_t expectdata);
79
PROTO_NORMAL(__xdrrec_getrec);
80
81
struct ct_data;
82
83
static struct  xdr_ops xdrrec_ops = {
84
	xdrrec_getlong,
85
	xdrrec_putlong,
86
	xdrrec_getbytes,
87
	xdrrec_putbytes,
88
	xdrrec_getpos,
89
	xdrrec_setpos,
90
	xdrrec_inline,
91
	xdrrec_destroy,
92
	NULL, /* xdrrec_control */
93
};
94
95
/*
96
 * A record is composed of one or more record fragments.
97
 * A record fragment is a four-byte header followed by zero to
98
 * 2**32-1 bytes.  The header is treated as a long unsigned and is
99
 * encode/decoded to the network via htonl/ntohl.  The low order 31 bits
100
 * are a byte count of the fragment.  The highest order bit is a boolean:
101
 * 1 => this fragment is the last fragment of the record,
102
 * 0 => this fragment is followed by more fragment(s).
103
 *
104
 * The fragment/record machinery is not general;  it is constructed to
105
 * meet the needs of xdr and rpc based on tcp.
106
 */
107
108
#define LAST_FRAG ((u_int32_t)(1U << 31))
109
110
typedef struct rec_strm {
111
	caddr_t tcp_handle;
112
	/*
113
	 * out-goung bits
114
	 */
115
	int (*writeit)(caddr_t, caddr_t, int);
116
	caddr_t out_base;	/* output buffer (points to frag header) */
117
	caddr_t out_finger;	/* next output position */
118
	caddr_t out_boundry;	/* data cannot up to this address */
119
	u_int32_t *frag_header;	/* beginning of current fragment */
120
	bool_t frag_sent;	/* true if buffer sent in middle of record */
121
	/*
122
	 * in-coming bits
123
	 */
124
	int (*readit)(caddr_t, caddr_t, int);
125
	u_long in_size;	/* fixed size of the input buffer */
126
	caddr_t in_base;
127
	caddr_t in_finger;	/* location of next byte to be had */
128
	caddr_t in_boundry;	/* can read up to this location */
129
	long fbtbc;		/* fragment bytes to be consumed */
130
	bool_t last_frag;
131
	u_int sendsize;
132
	u_int recvsize;
133
134
	bool_t nonblock;
135
	bool_t in_haveheader;
136
	u_int32_t in_header;
137
	char *in_hdrp;
138
	int in_hdrlen;
139
	int in_reclen;
140
	int in_received;
141
	int in_maxrec;
142
} RECSTREAM;
143
144
static u_int	fix_buf_size(u_int);
145
static bool_t	flush_out(RECSTREAM *, bool_t);
146
static bool_t	fill_input_buf(RECSTREAM *);
147
static bool_t	get_input_bytes(RECSTREAM *, caddr_t, int);
148
static bool_t	set_input_fragment(RECSTREAM *);
149
static bool_t	skip_input_bytes(RECSTREAM *, long);
150
static bool_t	realloc_stream(RECSTREAM *, int);
151
152
/*
153
 * Create an xdr handle for xdrrec
154
 * xdrrec_create fills in xdrs.  Sendsize and recvsize are
155
 * send and recv buffer sizes (0 => use default).
156
 * tcp_handle is an opaque handle that is passed as the first parameter to
157
 * the procedures readit and writeit.  Readit and writeit are read and
158
 * write respectively.   They are like the system
159
 * calls expect that they take an opaque handle rather than an fd.
160
 */
161
void
162
xdrrec_create(XDR *xdrs, u_int sendsize, u_int recvsize, caddr_t tcp_handle,
163
	int (*readit)(caddr_t, caddr_t, int),	/* like read, but pass it a
164
						   tcp_handle, not sock */
165
	int (*writeit)(caddr_t, caddr_t, int))	/* like write, but pass it a
166
						   tcp_handle, not sock */
167
{
168
	RECSTREAM *rstrm =
169
		(RECSTREAM *)mem_alloc(sizeof(RECSTREAM));
170
171
	if (rstrm == NULL) {
172
		/*
173
		 *  This is bad.  Should rework xdrrec_create to
174
		 *  return a handle, and in this case return NULL
175
		 */
176
		return;
177
	}
178
179
	rstrm->sendsize = sendsize = fix_buf_size(sendsize);
180
	rstrm->out_base = malloc(rstrm->sendsize);
181
	if (rstrm->out_base == NULL) {
182
		mem_free(rstrm, sizeof(RECSTREAM));
183
		return;
184
	}
185
186
	rstrm->recvsize = recvsize = fix_buf_size(recvsize);
187
	rstrm->in_base = malloc(recvsize);
188
	if (rstrm->in_base == NULL) {
189
		mem_free(rstrm->out_base, sendsize);
190
		mem_free(rstrm, sizeof(RECSTREAM));
191
		return;
192
	}
193
	/*
194
	 * now the rest ...
195
	 */
196
	xdrs->x_ops = &xdrrec_ops;
197
	xdrs->x_private = (caddr_t)rstrm;
198
	rstrm->tcp_handle = tcp_handle;
199
	rstrm->readit = readit;
200
	rstrm->writeit = writeit;
201
	rstrm->out_finger = rstrm->out_boundry = rstrm->out_base;
202
	rstrm->frag_header = (u_int32_t *)rstrm->out_base;
203
	rstrm->out_finger += sizeof(u_int32_t);
204
	rstrm->out_boundry += sendsize;
205
	rstrm->frag_sent = FALSE;
206
	rstrm->in_size = recvsize;
207
	rstrm->in_boundry = rstrm->in_base;
208
	rstrm->in_finger = (rstrm->in_boundry += recvsize);
209
	rstrm->fbtbc = 0;
210
	rstrm->last_frag = TRUE;
211
	rstrm->in_haveheader = FALSE;
212
	rstrm->in_hdrlen = 0;
213
	rstrm->in_hdrp = (char *)(void *)&rstrm->in_header;
214
	rstrm->nonblock = FALSE;
215
	rstrm->in_reclen = 0;
216
	rstrm->in_received = 0;
217
}
218
DEF_WEAK(xdrrec_create);
219
220
221
/*
222
 * The reoutines defined below are the xdr ops which will go into the
223
 * xdr handle filled in by xdrrec_create.
224
 */
225
226
static bool_t
227
xdrrec_getlong(XDR *xdrs, long int *lp)
228
{
229
	RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private);
230
	int32_t *buflp = (int32_t *)(rstrm->in_finger);
231
	int32_t mylong;
232
233
	/* first try the inline, fast case */
234
	if ((rstrm->fbtbc >= sizeof(int32_t)) &&
235
		(((long)rstrm->in_boundry - (long)buflp) >= sizeof(int32_t))) {
236
		*lp = (long)ntohl((u_int32_t)(*buflp));
237
		rstrm->fbtbc -= sizeof(int32_t);
238
		rstrm->in_finger += sizeof(int32_t);
239
	} else {
240
		if (! xdrrec_getbytes(xdrs, (caddr_t)(void *)&mylong,
241
		    sizeof(int32_t)))
242
			return (FALSE);
243
		*lp = (long)ntohl((u_int32_t)mylong);
244
	}
245
	return (TRUE);
246
}
247
248
static bool_t
249
xdrrec_putlong(XDR *xdrs, long int *lp)
250
{
251
	RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private);
252
	int32_t *dest_lp = ((int32_t *)(rstrm->out_finger));
253
254
	if ((rstrm->out_finger += sizeof(int32_t)) > rstrm->out_boundry) {
255
		/*
256
		 * this case should almost never happen so the code is
257
		 * inefficient
258
		 */
259
		rstrm->out_finger -= sizeof(int32_t);
260
		rstrm->frag_sent = TRUE;
261
		if (! flush_out(rstrm, FALSE))
262
			return (FALSE);
263
		dest_lp = ((int32_t *)(void *)(rstrm->out_finger));
264
		rstrm->out_finger += sizeof(int32_t);
265
	}
266
	*dest_lp = (int32_t)htonl((u_int32_t)(*lp));
267
	return (TRUE);
268
}
269
270
static bool_t  /* must manage buffers, fragments, and records */
271
xdrrec_getbytes(XDR *xdrs, caddr_t addr, u_int len)
272
{
273
	RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private);
274
	int current;
275
276
	while (len > 0) {
277
		current = rstrm->fbtbc;
278
		if (current == 0) {
279
			if (rstrm->last_frag)
280
				return (FALSE);
281
			if (! set_input_fragment(rstrm))
282
				return (FALSE);
283
			continue;
284
		}
285
		current = (len < current) ? len : current;
286
		if (! get_input_bytes(rstrm, addr, current))
287
			return (FALSE);
288
		addr += current;
289
		rstrm->fbtbc -= current;
290
		len -= current;
291
	}
292
	return (TRUE);
293
}
294
295
static bool_t
296
xdrrec_putbytes(XDR *xdrs, caddr_t addr, u_int len)
297
{
298
	RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private);
299
	long current;
300
301
	while (len > 0) {
302
		current = (u_long)rstrm->out_boundry -
303
		    (u_long)rstrm->out_finger;
304
		current = (len < current) ? len : current;
305
		memcpy(rstrm->out_finger, addr, current);
306
		rstrm->out_finger += current;
307
		addr += current;
308
		len -= current;
309
		if (rstrm->out_finger == rstrm->out_boundry) {
310
			rstrm->frag_sent = TRUE;
311
			if (! flush_out(rstrm, FALSE))
312
				return (FALSE);
313
		}
314
	}
315
	return (TRUE);
316
}
317
318
static u_int
319
xdrrec_getpos(XDR *xdrs)
320
{
321
	RECSTREAM *rstrm = (RECSTREAM *)xdrs->x_private;
322
	off_t pos;
323
324
	pos = lseek((int)(long)rstrm->tcp_handle, 0, SEEK_CUR);
325
	if (pos != -1)
326
		switch (xdrs->x_op) {
327
328
		case XDR_ENCODE:
329
			pos += rstrm->out_finger - rstrm->out_base;
330
			break;
331
332
		case XDR_DECODE:
333
			pos -= rstrm->in_boundry - rstrm->in_finger;
334
			break;
335
336
		default:
337
			pos = -1;
338
			break;
339
		}
340
	return ((u_int) pos);
341
}
342
343
static bool_t
344
xdrrec_setpos(XDR *xdrs, u_int pos)
345
{
346
	RECSTREAM *rstrm = (RECSTREAM *)xdrs->x_private;
347
	u_int currpos = xdrrec_getpos(xdrs);
348
	int delta = currpos - pos;
349
	caddr_t newpos;
350
351
	if ((int)currpos != -1)
352
		switch (xdrs->x_op) {
353
354
		case XDR_ENCODE:
355
			newpos = rstrm->out_finger - delta;
356
			if ((newpos > (caddr_t)(rstrm->frag_header)) &&
357
				(newpos < rstrm->out_boundry)) {
358
				rstrm->out_finger = newpos;
359
				return (TRUE);
360
			}
361
			break;
362
363
		case XDR_DECODE:
364
			newpos = rstrm->in_finger - delta;
365
			if ((delta < (int)(rstrm->fbtbc)) &&
366
				(newpos <= rstrm->in_boundry) &&
367
				(newpos >= rstrm->in_base)) {
368
				rstrm->in_finger = newpos;
369
				rstrm->fbtbc -= delta;
370
				return (TRUE);
371
			}
372
			break;
373
374
		case XDR_FREE:
375
			break;
376
		}
377
	return (FALSE);
378
}
379
380
static int32_t *
381
xdrrec_inline(XDR *xdrs, u_int len)
382
{
383
	RECSTREAM *rstrm = (RECSTREAM *)xdrs->x_private;
384
	int32_t *buf = NULL;
385
386
	switch (xdrs->x_op) {
387
388
	case XDR_ENCODE:
389
		if ((rstrm->out_finger + len) <= rstrm->out_boundry) {
390
			buf = (int32_t *) rstrm->out_finger;
391
			rstrm->out_finger += len;
392
		}
393
		break;
394
395
	case XDR_DECODE:
396
		if ((len <= rstrm->fbtbc) &&
397
			((rstrm->in_finger + len) <= rstrm->in_boundry)) {
398
			buf = (int32_t *) rstrm->in_finger;
399
			rstrm->fbtbc -= len;
400
			rstrm->in_finger += len;
401
		}
402
		break;
403
404
	case XDR_FREE:
405
		break;
406
	}
407
	return (buf);
408
}
409
410
static void
411
xdrrec_destroy(XDR *xdrs)
412
{
413
	RECSTREAM *rstrm = (RECSTREAM *)xdrs->x_private;
414
415
	mem_free(rstrm->out_base, rstrm->sendsize);
416
	mem_free(rstrm->in_base, rstrm->recvsize);
417
	mem_free(rstrm, sizeof(RECSTREAM));
418
}
419
420
/*
421
 * Exported routines to manage xdr records
422
 */
423
424
/*
425
 * Before reading (deserializing from the stream, one should always call
426
 * this procedure to guarantee proper record alignment.
427
 */
428
bool_t
429
xdrrec_skiprecord(XDR *xdrs)
430
{
431
	RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private);
432
	enum xprt_stat xstat;
433
434
	if (rstrm->nonblock) {
435
		if (__xdrrec_getrec(xdrs, &xstat, FALSE)) {
436
			rstrm->fbtbc = 0;
437
			return (TRUE);
438
		}
439
		if (rstrm->in_finger == rstrm->in_boundry &&
440
		    xstat == XPRT_MOREREQS) {
441
			rstrm->fbtbc = 0;
442
			return (TRUE);
443
		}
444
		return (FALSE);
445
	}
446
	while (rstrm->fbtbc > 0 || (! rstrm->last_frag)) {
447
		if (! skip_input_bytes(rstrm, rstrm->fbtbc))
448
			return (FALSE);
449
		rstrm->fbtbc = 0;
450
		if ((! rstrm->last_frag) && (! set_input_fragment(rstrm)))
451
			return (FALSE);
452
	}
453
	rstrm->last_frag = FALSE;
454
	return (TRUE);
455
}
456
DEF_WEAK(xdrrec_skiprecord);
457
458
/*
459
 * Look ahead fuction.
460
 * Returns TRUE iff there is no more input in the buffer
461
 * after consuming the rest of the current record.
462
 */
463
bool_t
464
xdrrec_eof(XDR *xdrs)
465
{
466
	RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private);
467
468
	while (rstrm->fbtbc > 0 || (! rstrm->last_frag)) {
469
		if (! skip_input_bytes(rstrm, rstrm->fbtbc))
470
			return (TRUE);
471
		rstrm->fbtbc = 0;
472
		if ((! rstrm->last_frag) && (! set_input_fragment(rstrm)))
473
			return (TRUE);
474
	}
475
	if (rstrm->in_finger == rstrm->in_boundry)
476
		return (TRUE);
477
	return (FALSE);
478
}
479
DEF_WEAK(xdrrec_eof);
480
481
/*
482
 * The client must tell the package when an end-of-record has occurred.
483
 * The second paraemters tells whether the record should be flushed to the
484
 * (output) tcp stream.  (This let's the package support batched or
485
 * pipelined procedure calls.)  TRUE => immmediate flush to tcp connection.
486
 */
487
bool_t
488
xdrrec_endofrecord(XDR *xdrs, int32_t sendnow)
489
{
490
	RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private);
491
	u_long len;  /* fragment length */
492
493
	if (sendnow || rstrm->frag_sent ||
494
		((u_long)rstrm->out_finger + sizeof(u_int32_t) >=
495
		(u_long)rstrm->out_boundry)) {
496
		rstrm->frag_sent = FALSE;
497
		return (flush_out(rstrm, TRUE));
498
	}
499
	len = (u_long)(rstrm->out_finger) - (u_long)(rstrm->frag_header) -
500
	   sizeof(u_int32_t);
501
	*(rstrm->frag_header) = htonl((u_long)len | LAST_FRAG);
502
	rstrm->frag_header = (u_int32_t *)rstrm->out_finger;
503
	rstrm->out_finger += sizeof(u_int32_t);
504
	return (TRUE);
505
}
506
DEF_WEAK(xdrrec_endofrecord);
507
508
/*
509
 * Fill the stream buffer with a record for a non-blocking connection.
510
 * Return true if a record is available in the buffer, false if not.
511
 */
512
bool_t
513
__xdrrec_getrec(XDR *xdrs, enum xprt_stat *statp, bool_t expectdata)
514
{
515
	RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private);
516
	ssize_t n;
517
	int fraglen;
518
519
	if (!rstrm->in_haveheader) {
520
		n = rstrm->readit(rstrm->tcp_handle, rstrm->in_hdrp,
521
		    (int)sizeof (rstrm->in_header) - rstrm->in_hdrlen);
522
		if (n == 0) {
523
			*statp = expectdata ? XPRT_DIED : XPRT_IDLE;
524
			return (FALSE);
525
		}
526
		if (n < 0) {
527
			*statp = XPRT_DIED;
528
			return (FALSE);
529
		}
530
		rstrm->in_hdrp += n;
531
		rstrm->in_hdrlen += n;
532
		if (rstrm->in_hdrlen < sizeof (rstrm->in_header)) {
533
			*statp = XPRT_MOREREQS;
534
			return (FALSE);
535
		}
536
		rstrm->in_header = ntohl(rstrm->in_header);
537
		fraglen = (int)(rstrm->in_header & ~LAST_FRAG);
538
		if (fraglen == 0 || fraglen > rstrm->in_maxrec ||
539
		    (rstrm->in_reclen + fraglen) > rstrm->in_maxrec) {
540
			*statp = XPRT_DIED;
541
			return (FALSE);
542
		}
543
		rstrm->in_reclen += fraglen;
544
		if (rstrm->in_reclen > rstrm->recvsize)
545
			realloc_stream(rstrm, rstrm->in_reclen);
546
		if (rstrm->in_header & LAST_FRAG) {
547
			rstrm->in_header &= ~LAST_FRAG;
548
			rstrm->last_frag = TRUE;
549
		}
550
	}
551
552
	n =  rstrm->readit(rstrm->tcp_handle,
553
	    rstrm->in_base + rstrm->in_received,
554
	    (rstrm->in_reclen - rstrm->in_received));
555
556
	if (n < 0) {
557
		*statp = XPRT_DIED;
558
		return (FALSE);
559
	}
560
561
	if (n == 0) {
562
		*statp = expectdata ? XPRT_DIED : XPRT_IDLE;
563
		return (FALSE);
564
	}
565
566
	rstrm->in_received += n;
567
568
	if (rstrm->in_received == rstrm->in_reclen) {
569
		rstrm->in_haveheader = (FALSE);
570
		rstrm->in_hdrp = (char *)(void *)&rstrm->in_header;
571
		rstrm->in_hdrlen = 0;
572
		if (rstrm->last_frag) {
573
			rstrm->fbtbc = rstrm->in_reclen;
574
			rstrm->in_boundry = rstrm->in_base + rstrm->in_reclen;
575
			rstrm->in_finger = rstrm->in_base;
576
			rstrm->in_reclen = rstrm->in_received = 0;
577
			*statp = XPRT_MOREREQS;
578
			return (TRUE);
579
		}
580
	}
581
582
	*statp = XPRT_MOREREQS;
583
	return (FALSE);
584
}
585
DEF_STRONG(__xdrrec_getrec);
586
587
bool_t
588
__xdrrec_setnonblock(XDR *xdrs, int maxrec)
589
{
590
	RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private);
591
592
	rstrm->nonblock = TRUE;
593
	if (maxrec == 0)
594
		maxrec = rstrm->recvsize;
595
	rstrm->in_maxrec = maxrec;
596
	return (TRUE);
597
}
598
599
600
/*
601
 * Internal useful routines
602
 */
603
static bool_t
604
flush_out(RECSTREAM *rstrm, int32_t eor)
605
{
606
	u_long eormask = (eor == TRUE) ? LAST_FRAG : 0;
607
	u_int32_t len = (u_long)(rstrm->out_finger) -
608
		(u_long)(rstrm->frag_header) - sizeof(u_int32_t);
609
610
	*(rstrm->frag_header) = htonl(len | eormask);
611
	len = (u_long)(rstrm->out_finger) - (u_long)(rstrm->out_base);
612
	if ((*(rstrm->writeit))(rstrm->tcp_handle, rstrm->out_base, (int)len)
613
		!= (int)len)
614
		return (FALSE);
615
	rstrm->frag_header = (u_int32_t *)rstrm->out_base;
616
	rstrm->out_finger = (caddr_t)rstrm->out_base + sizeof(u_int32_t);
617
	return (TRUE);
618
}
619
620
static bool_t  /* knows nothing about records!  Only about input buffers */
621
fill_input_buf(RECSTREAM *rstrm)
622
{
623
	caddr_t where;
624
	u_long i;
625
	long len;
626
627
	if (rstrm->nonblock)
628
		return FALSE;
629
	where = rstrm->in_base;
630
	i = (u_long)rstrm->in_boundry % BYTES_PER_XDR_UNIT;
631
	where += i;
632
	len = rstrm->in_size - i;
633
	if ((len = (*(rstrm->readit))(rstrm->tcp_handle, where, len)) == -1)
634
		return (FALSE);
635
	rstrm->in_finger = where;
636
	where += len;
637
	rstrm->in_boundry = where;
638
	return (TRUE);
639
}
640
641
static bool_t  /* knows nothing about records!  Only about input buffers */
642
get_input_bytes(RECSTREAM *rstrm, caddr_t addr, int len)
643
{
644
	long current;
645
646
	if (rstrm->nonblock) {
647
		if (len > (int)(rstrm->in_boundry - rstrm->in_finger))
648
			return FALSE;
649
		memcpy(addr, rstrm->in_finger, len);
650
		rstrm->in_finger += len;
651
		return (TRUE);
652
	}
653
654
	while (len > 0) {
655
		current = (long)rstrm->in_boundry - (long)rstrm->in_finger;
656
		if (current == 0) {
657
			if (! fill_input_buf(rstrm))
658
				return (FALSE);
659
			continue;
660
		}
661
		current = (len < current) ? len : current;
662
		memcpy(addr, rstrm->in_finger, current);
663
		rstrm->in_finger += current;
664
		addr += current;
665
		len -= current;
666
	}
667
	return (TRUE);
668
}
669
670
static bool_t  /* next four bytes of the input stream are treated as a header */
671
set_input_fragment(RECSTREAM *rstrm)
672
{
673
	u_int32_t header;
674
675
	if (rstrm->nonblock)
676
		return (FALSE);
677
	if (! get_input_bytes(rstrm, (caddr_t)&header, sizeof(header)))
678
		return (FALSE);
679
	header = (long)ntohl(header);
680
	rstrm->last_frag = ((header & LAST_FRAG) == 0) ? FALSE : TRUE;
681
	/*
682
	 * Sanity check. Try not to accept wildly incorrect
683
	 * record sizes. Unfortunately, the only record size
684
	 * we can positively identify as being 'wildly incorrect'
685
	 * is zero. Ridiculously large record sizes may look wrong,
686
	 * but we don't have any way to be certain that they aren't
687
	 * what the client actually intended to send us.
688
	 */
689
	if (header == 0)
690
		return(FALSE);
691
	rstrm->fbtbc = header & (~LAST_FRAG);
692
	return (TRUE);
693
}
694
695
static bool_t  /* consumes input bytes; knows nothing about records! */
696
skip_input_bytes(RECSTREAM *rstrm, long int cnt)
697
{
698
	long current;
699
700
	while (cnt > 0) {
701
		current = (long)rstrm->in_boundry - (long)rstrm->in_finger;
702
		if (current == 0) {
703
			if (! fill_input_buf(rstrm))
704
				return (FALSE);
705
			continue;
706
		}
707
		current = (cnt < current) ? cnt : current;
708
		rstrm->in_finger += current;
709
		cnt -= current;
710
	}
711
	return (TRUE);
712
}
713
714
static u_int
715
fix_buf_size(u_int s)
716
{
717
718
	if (s < 100)
719
		s = 4000;
720
	return (RNDUP(s));
721
}
722
723
/*
724
 * Reallocate the input buffer for a non-block stream.
725
 */
726
static bool_t
727
realloc_stream(RECSTREAM *rstrm, int size)
728
{
729
	ptrdiff_t diff;
730
	char *buf;
731
732
	if (size > rstrm->recvsize) {
733
		buf = realloc(rstrm->in_base, size);
734
		if (buf == NULL)
735
			return (FALSE);
736
		diff = buf - rstrm->in_base;
737
		rstrm->in_finger += diff;
738
		rstrm->in_base = buf;
739
		rstrm->in_boundry = buf + size;
740
		rstrm->recvsize = size;
741
		rstrm->in_size = size;
742
	}
743
744
	return (TRUE);
745
}