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[/] [or1k/] [trunk/] [rtems/] [c/] [src/] [libnetworking/] [libc/] [ns_print.c] - Blame information for rev 1765

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1 158 chris
/*
2
 * Copyright (c) 1996, 1998 by Internet Software Consortium.
3
 *
4
 * Permission to use, copy, modify, and distribute this software for any
5
 * purpose with or without fee is hereby granted, provided that the above
6
 * copyright notice and this permission notice appear in all copies.
7
 *
8
 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
9
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
10
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
11
 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
12
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
13
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
14
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
15
 * SOFTWARE.
16
 */
17
 
18
#if !defined(__rtems__)
19
#if !defined(LINT) && !defined(CODECENTER)
20 208 chris
static char rcsid[] = "$Id: ns_print.c,v 1.2 2001-09-27 12:01:53 chris Exp $";
21 158 chris
#endif /* not lint */
22
#endif /* not rtems */
23
 
24
/* Import. */
25
 
26
#include <sys/types.h>
27
#include <sys/socket.h>
28
 
29
#include <netinet/in.h>
30
#include <arpa/nameser.h>
31
#include <arpa/inet.h>
32
 
33
#include <assert.h>
34
#include <errno.h>
35
#include <resolv.h>
36
#include <string.h>
37
#include <ctype.h>
38
 
39
#define SPRINTF(x) ((size_t)sprintf x)
40
 
41
/* Forward. */
42
 
43
static size_t   prune_origin(const char *name, const char *origin);
44
static int      charstr(const u_char *rdata, const u_char *edata,
45
                        char **buf, size_t *buflen);
46
static int      addname(const u_char *msg, size_t msglen,
47
                        const u_char **p, const char *origin,
48
                        char **buf, size_t *buflen);
49
static void     addlen(size_t len, char **buf, size_t *buflen);
50
static int      addstr(const char *src, size_t len,
51
                       char **buf, size_t *buflen);
52
static int      addtab(size_t len, size_t target, int spaced,
53
                       char **buf, size_t *buflen);
54
 
55
/* Macros. */
56
 
57
#define T(x) \
58
        do { \
59
                if ((x) < 0) \
60
                        return (-1); \
61
        } while (0)
62
 
63
/* Public. */
64
 
65
/*
66
 * int
67
 * ns_sprintrr(handle, rr, name_ctx, origin, buf, buflen)
68
 *      Convert an RR to presentation format.
69
 * return:
70
 *      Number of characters written to buf, or -1 (check errno).
71
 */
72
int
73
ns_sprintrr(const ns_msg *handle, const ns_rr *rr,
74
            const char *name_ctx, const char *origin,
75
            char *buf, size_t buflen)
76
{
77
        int n;
78
 
79
        n = ns_sprintrrf(ns_msg_base(*handle), ns_msg_size(*handle),
80
                         ns_rr_name(*rr), ns_rr_class(*rr), ns_rr_type(*rr),
81
                         ns_rr_ttl(*rr), ns_rr_rdata(*rr), ns_rr_rdlen(*rr),
82
                         name_ctx, origin, buf, buflen);
83
        return (n);
84
}
85
 
86
/*
87
 * int
88
 * ns_sprintrrf(msg, msglen, name, class, type, ttl, rdata, rdlen,
89
 *             name_ctx, origin, buf, buflen)
90
 *      Convert the fields of an RR into presentation format.
91
 * return:
92
 *      Number of characters written to buf, or -1 (check errno).
93
 */
94
int
95
ns_sprintrrf(const u_char *msg, size_t msglen,
96
            const char *name, ns_class class, ns_type type,
97
            u_long ttl, const u_char *rdata, size_t rdlen,
98
            const char *name_ctx, const char *origin,
99
            char *buf, size_t buflen)
100
{
101
        const char *obuf = buf;
102
        const u_char *edata = rdata + rdlen;
103
        int spaced = 0;
104
 
105
        const char *comment;
106
        char tmp[100];
107
        int len, x;
108
 
109
        /*
110
         * Owner.
111
         */
112
        if (name_ctx != NULL && strcasecmp(name_ctx, name) == 0) {
113
                T(addstr("\t\t\t", 3, &buf, &buflen));
114
        } else {
115
                len = prune_origin(name, origin);
116
                if (len == 0) {
117
                        T(addstr("@\t\t\t", 4, &buf, &buflen));
118
                } else {
119
                        T(addstr(name, len, &buf, &buflen));
120
                        /* Origin not used and no trailing dot? */
121
                        if ((!origin || !origin[0] || name[len] == '\0') &&
122
                            name[len - 1] != '.') {
123
                                T(addstr(".", 1, &buf, &buflen));
124
                                len++;
125
                        }
126
                        T(spaced = addtab(len, 24, spaced, &buf, &buflen));
127
                }
128
        }
129
 
130
        /*
131
         * TTL, Class, Type.
132
         */
133
        T(x = ns_format_ttl(ttl, buf, buflen));
134
        addlen(x, &buf, &buflen);
135
        len = SPRINTF((tmp, " %s %s", p_class(class), p_type(type)));
136
        T(addstr(tmp, len, &buf, &buflen));
137
        T(spaced = addtab(x + len, 16, spaced, &buf, &buflen));
138
 
139
        /*
140
         * RData.
141
         */
142
        switch (type) {
143
        case ns_t_a:
144
                if (rdlen != NS_INADDRSZ)
145
                        goto formerr;
146
                (void) inet_ntop(AF_INET, rdata, buf, buflen);
147
                addlen(strlen(buf), &buf, &buflen);
148
                break;
149
 
150
        case ns_t_cname:
151
        case ns_t_mb:
152
        case ns_t_mg:
153
        case ns_t_mr:
154
        case ns_t_ns:
155
        case ns_t_ptr:
156
                T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
157
                break;
158
 
159
        case ns_t_hinfo:
160
        case ns_t_isdn:
161
                /* First word. */
162
                T(len = charstr(rdata, edata, &buf, &buflen));
163
                if (len == 0)
164
                        goto formerr;
165
                rdata += len;
166
                T(addstr(" ", 1, &buf, &buflen));
167
 
168
                /* Second word. */
169
                T(len = charstr(rdata, edata, &buf, &buflen));
170
                if (len == 0)
171
                        goto formerr;
172
                rdata += len;
173
                break;
174
 
175
        case ns_t_soa: {
176
                u_long t;
177
 
178
                /* Server name. */
179
                T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
180
                T(addstr(" ", 1, &buf, &buflen));
181
 
182
                /* Administrator name. */
183
                T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
184
                T(addstr(" (\n", 3, &buf, &buflen));
185
                spaced = 0;
186
 
187
                if ((edata - rdata) != 5*NS_INT32SZ)
188
                        goto formerr;
189
 
190
                /* Serial number. */
191
                t = ns_get32(rdata);  rdata += NS_INT32SZ;
192
                T(addstr("\t\t\t\t\t", 5, &buf, &buflen));
193
                len = SPRINTF((tmp, "%lu", t));
194
                T(addstr(tmp, len, &buf, &buflen));
195
                T(spaced = addtab(len, 16, spaced, &buf, &buflen));
196
                T(addstr("; serial\n", 9, &buf, &buflen));
197
                spaced = 0;
198
 
199
                /* Refresh interval. */
200
                t = ns_get32(rdata);  rdata += NS_INT32SZ;
201
                T(addstr("\t\t\t\t\t", 5, &buf, &buflen));
202
                T(len = ns_format_ttl(t, buf, buflen));
203
                addlen(len, &buf, &buflen);
204
                T(spaced = addtab(len, 16, spaced, &buf, &buflen));
205
                T(addstr("; refresh\n", 10, &buf, &buflen));
206
                spaced = 0;
207
 
208
                /* Retry interval. */
209
                t = ns_get32(rdata);  rdata += NS_INT32SZ;
210
                T(addstr("\t\t\t\t\t", 5, &buf, &buflen));
211
                T(len = ns_format_ttl(t, buf, buflen));
212
                addlen(len, &buf, &buflen);
213
                T(spaced = addtab(len, 16, spaced, &buf, &buflen));
214
                T(addstr("; retry\n", 8, &buf, &buflen));
215
                spaced = 0;
216
 
217
                /* Expiry. */
218
                t = ns_get32(rdata);  rdata += NS_INT32SZ;
219
                T(addstr("\t\t\t\t\t", 5, &buf, &buflen));
220
                T(len = ns_format_ttl(t, buf, buflen));
221
                addlen(len, &buf, &buflen);
222
                T(spaced = addtab(len, 16, spaced, &buf, &buflen));
223
                T(addstr("; expiry\n", 9, &buf, &buflen));
224
                spaced = 0;
225
 
226
                /* Minimum TTL. */
227
                t = ns_get32(rdata);  rdata += NS_INT32SZ;
228
                T(addstr("\t\t\t\t\t", 5, &buf, &buflen));
229
                T(len = ns_format_ttl(t, buf, buflen));
230
                addlen(len, &buf, &buflen);
231
                T(addstr(" )", 2, &buf, &buflen));
232
                T(spaced = addtab(len, 16, spaced, &buf, &buflen));
233
                T(addstr("; minimum\n", 10, &buf, &buflen));
234
 
235
                break;
236
            }
237
 
238
        case ns_t_mx:
239
        case ns_t_afsdb:
240
        case ns_t_rt: {
241
                u_int t;
242
 
243
                if (rdlen < NS_INT16SZ)
244
                        goto formerr;
245
 
246
                /* Priority. */
247
                t = ns_get16(rdata);
248
                rdata += NS_INT16SZ;
249
                len = SPRINTF((tmp, "%u ", t));
250
                T(addstr(tmp, len, &buf, &buflen));
251
 
252
                /* Target. */
253
                T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
254
 
255
                break;
256
            }
257
 
258
        case ns_t_px: {
259
                u_int t;
260
 
261
                if (rdlen < NS_INT16SZ)
262
                        goto formerr;
263
 
264
                /* Priority. */
265
                t = ns_get16(rdata);
266
                rdata += NS_INT16SZ;
267
                len = SPRINTF((tmp, "%u ", t));
268
                T(addstr(tmp, len, &buf, &buflen));
269
 
270
                /* Name1. */
271
                T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
272
                T(addstr(" ", 1, &buf, &buflen));
273
 
274
                /* Name2. */
275
                T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
276
 
277
                break;
278
            }
279
 
280
        case ns_t_x25:
281
                T(len = charstr(rdata, edata, &buf, &buflen));
282
                if (len == 0)
283
                        goto formerr;
284
                rdata += len;
285
                break;
286
 
287
        case ns_t_txt:
288
                while (rdata < edata) {
289
                        T(len = charstr(rdata, edata, &buf, &buflen));
290
                        if (len == 0)
291
                                goto formerr;
292
                        rdata += len;
293
                        if (rdata < edata)
294
                                T(addstr(" ", 1, &buf, &buflen));
295
                }
296
                break;
297
 
298
        case ns_t_nsap: {
299
                char t[255*3];
300
 
301
                (void) inet_nsap_ntoa(rdlen, rdata, t);
302
                T(addstr(t, strlen(t), &buf, &buflen));
303
                break;
304
            }
305
 
306
        case ns_t_aaaa:
307
                if (rdlen != NS_IN6ADDRSZ)
308
                        goto formerr;
309
                (void) inet_ntop(AF_INET6, rdata, buf, buflen);
310
                addlen(strlen(buf), &buf, &buflen);
311
                break;
312
 
313
        case ns_t_loc: {
314
                char t[255];
315
 
316
                /* XXX protocol format checking? */
317
                (void) loc_ntoa(rdata, t);
318
                T(addstr(t, strlen(t), &buf, &buflen));
319
                break;
320
            }
321
 
322
        case ns_t_naptr: {
323
                u_int order, preference;
324
                char t[50];
325
 
326
                if (rdlen < 2*NS_INT16SZ)
327
                        goto formerr;
328
 
329
                /* Order, Precedence. */
330
                order = ns_get16(rdata);        rdata += NS_INT16SZ;
331
                preference = ns_get16(rdata);   rdata += NS_INT16SZ;
332
                len = SPRINTF((t, "%u %u ", order, preference));
333
                T(addstr(t, len, &buf, &buflen));
334
 
335
                /* Flags. */
336
                T(len = charstr(rdata, edata, &buf, &buflen));
337
                if (len == 0)
338
                        goto formerr;
339
                rdata += len;
340
                T(addstr(" ", 1, &buf, &buflen));
341
 
342
                /* Service. */
343
                T(len = charstr(rdata, edata, &buf, &buflen));
344
                if (len == 0)
345
                        goto formerr;
346
                rdata += len;
347
                T(addstr(" ", 1, &buf, &buflen));
348
 
349
                /* Regexp. */
350
                T(len = charstr(rdata, edata, &buf, &buflen));
351
                if (len < 0)
352
                        return (-1);
353
                if (len == 0)
354
                        goto formerr;
355
                rdata += len;
356
                T(addstr(" ", 1, &buf, &buflen));
357
 
358
                /* Server. */
359
                T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
360
                break;
361
            }
362
 
363
        case ns_t_srv: {
364
                u_int priority, weight, port;
365
                char t[50];
366
 
367
                if (rdlen < NS_INT16SZ*3)
368
                        goto formerr;
369
 
370
                /* Priority, Weight, Port. */
371
                priority = ns_get16(rdata);  rdata += NS_INT16SZ;
372
                weight   = ns_get16(rdata);  rdata += NS_INT16SZ;
373
                port     = ns_get16(rdata);  rdata += NS_INT16SZ;
374
                len = SPRINTF((t, "%u %u %u ", priority, weight, port));
375
                T(addstr(t, len, &buf, &buflen));
376
 
377
                /* Server. */
378
                T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
379
                break;
380
            }
381
 
382
        case ns_t_minfo:
383
        case ns_t_rp:
384
                /* Name1. */
385
                T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
386
                T(addstr(" ", 1, &buf, &buflen));
387
 
388
                /* Name2. */
389
                T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
390
 
391
                break;
392
 
393
        case ns_t_wks: {
394
                int n, lcnt;
395
 
396
                if (rdlen < NS_INT32SZ + 1)
397
                        goto formerr;
398
 
399
                /* Address. */
400
                (void) inet_ntop(AF_INET, rdata, buf, buflen);
401
                addlen(strlen(buf), &buf, &buflen);
402
                rdata += NS_INADDRSZ;
403
 
404
                /* Protocol. */
405
                len = SPRINTF((tmp, " %u ( ", *rdata));
406
                T(addstr(tmp, len, &buf, &buflen));
407
                rdata += NS_INT8SZ;
408
 
409
                /* Bit map. */
410
                n = 0;
411
                lcnt = 0;
412
                while (rdata < edata) {
413
                        u_int c = *rdata++;
414
                        do {
415
                                if (c & 0200) {
416
                                        if (lcnt == 0) {
417
                                                T(addstr("\n\t\t\t\t", 5,
418
                                                         &buf, &buflen));
419
                                                lcnt = 10;
420
                                                spaced = 0;
421
                                        }
422
                                        len = SPRINTF((tmp, "%d ", n));
423
                                        T(addstr(tmp, len, &buf, &buflen));
424
                                        lcnt--;
425
                                }
426
                                c <<= 1;
427
                        } while (++n & 07);
428
                }
429
                T(addstr(")", 1, &buf, &buflen));
430
 
431
                break;
432
            }
433
 
434
        case ns_t_key: {
435
                char base64_key[NS_MD5RSA_MAX_BASE64];
436
                u_int keyflags, protocol, algorithm;
437
                const char *leader;
438
                int n;
439
 
440
                if (rdlen < NS_INT16SZ + NS_INT8SZ + NS_INT8SZ)
441
                        goto formerr;
442
 
443
                /* Key flags, Protocol, Algorithm. */
444
                keyflags = ns_get16(rdata);  rdata += NS_INT16SZ;
445
                protocol = *rdata++;
446
                algorithm = *rdata++;
447
                len = SPRINTF((tmp, "0x%04x %u %u",
448
                               keyflags, protocol, algorithm));
449
                T(addstr(tmp, len, &buf, &buflen));
450
 
451
                /* Public key data. */
452
                len = b64_ntop(rdata, edata - rdata,
453
                               base64_key, sizeof base64_key);
454
                if (len < 0)
455
                        goto formerr;
456
                if (len > 15) {
457
                        T(addstr(" (", 2, &buf, &buflen));
458
                        leader = "\n\t\t";
459
                        spaced = 0;
460
                } else
461
                        leader = " ";
462
                for (n = 0; n < len; n += 48) {
463
                        T(addstr(leader, strlen(leader), &buf, &buflen));
464
                        T(addstr(base64_key + n, MIN(len - n, 48),
465
                                 &buf, &buflen));
466
                }
467
                if (len > 15)
468
                        T(addstr(" )", 2, &buf, &buflen));
469
 
470
                break;
471
            }
472
 
473
        case ns_t_sig: {
474
                char base64_key[NS_MD5RSA_MAX_BASE64];
475
                u_int type, algorithm, labels, footprint;
476
                const char *leader;
477
                u_long t;
478
                int n;
479
 
480
                if (rdlen < 22)
481
                        goto formerr;
482
 
483
                /* Type covered, Algorithm, Label count, Original TTL. */
484
                type = ns_get16(rdata);  rdata += NS_INT16SZ;
485
                algorithm = *rdata++;
486
                labels = *rdata++;
487
                t = ns_get32(rdata);  rdata += NS_INT32SZ;
488
                len = SPRINTF((tmp, " %s %d %lu ",
489
                               p_type(type), algorithm, t));
490
                T(addstr(tmp, len, &buf, &buflen));
491
                if (labels != (u_int)dn_count_labels(name))
492
                        goto formerr;
493
 
494
                /* Signature expiry. */
495
                t = ns_get32(rdata);  rdata += NS_INT32SZ;
496
                len = SPRINTF((tmp, "%s ", p_secstodate(t)));
497
                T(addstr(tmp, len, &buf, &buflen));
498
 
499
                /* Time signed. */
500
                t = ns_get32(rdata);  rdata += NS_INT32SZ;
501
                len = SPRINTF((tmp, "%s ", p_secstodate(t)));
502
                T(addstr(tmp, len, &buf, &buflen));
503
 
504
                /* Signature Footprint. */
505
                footprint = ns_get16(rdata);  rdata += NS_INT16SZ;
506
                len = SPRINTF((tmp, "%u ", footprint));
507
                T(addstr(tmp, len, &buf, &buflen));
508
 
509
                /* Signer's name. */
510
                T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
511
 
512
                /* Signature. */
513
                len = b64_ntop(rdata, edata - rdata,
514
                               base64_key, sizeof base64_key);
515
                if (len > 15) {
516
                        T(addstr(" (", 2, &buf, &buflen));
517
                        leader = "\n\t\t";
518
                        spaced = 0;
519
                } else
520
                        leader = " ";
521
                if (len < 0)
522
                        goto formerr;
523
                for (n = 0; n < len; n += 48) {
524
                        T(addstr(leader, strlen(leader), &buf, &buflen));
525
                        T(addstr(base64_key + n, MIN(len - n, 48),
526
                                 &buf, &buflen));
527
                }
528
                if (len > 15)
529
                        T(addstr(" )", 2, &buf, &buflen));
530
 
531
                break;
532
            }
533
 
534
        case ns_t_nxt: {
535
                int n, c;
536
 
537
                /* Next domain name. */
538
                T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
539
 
540
                /* Type bit map. */
541
                n = edata - rdata;
542
                for (c = 0; c < n*8; c++)
543
                        if (NS_NXT_BIT_ISSET(c, rdata)) {
544
                                len = SPRINTF((tmp, " %s", p_type(c)));
545
                                T(addstr(tmp, len, &buf, &buflen));
546
                        }
547
                break;
548
            }
549
 
550
        default:
551
                comment = "unknown RR type";
552
                goto hexify;
553
        }
554
        return (buf - obuf);
555
 formerr:
556
        comment = "RR format error";
557
 hexify: {
558
        int n, m;
559
        char *p;
560
 
561
        len = SPRINTF((tmp, "\\#(\t\t; %s", comment));
562
        T(addstr(tmp, len, &buf, &buflen));
563
        while (rdata < edata) {
564
                p = tmp;
565
                p += SPRINTF((p, "\n\t"));
566
                spaced = 0;
567
                n = MIN(16, edata - rdata);
568
                for (m = 0; m < n; m++)
569
                        p += SPRINTF((p, "%02x ", rdata[m]));
570
                T(addstr(tmp, p - tmp, &buf, &buflen));
571
                if (n < 16) {
572
                        T(addstr(")", 1, &buf, &buflen));
573
                        T(addtab(p - tmp + 1, 48, spaced, &buf, &buflen));
574
                }
575
                p = tmp;
576
                p += SPRINTF((p, "; "));
577
                for (m = 0; m < n; m++)
578
                        *p++ = (isascii(rdata[m]) && isprint(rdata[m]))
579
                                ? rdata[m]
580
                                : '.';
581
                T(addstr(tmp, p - tmp, &buf, &buflen));
582
                rdata += n;
583
        }
584
        return (buf - obuf);
585
    }
586
}
587
 
588
/* Private. */
589
 
590
/*
591
 * size_t
592
 * prune_origin(name, origin)
593
 *      Find out if the name is at or under the current origin.
594
 * return:
595
 *      Number of characters in name before start of origin,
596
 *      or length of name if origin does not match.
597
 * notes:
598
 *      This function should share code with samedomain().
599
 */
600
static size_t
601
prune_origin(const char *name, const char *origin) {
602
        const char *oname = name;
603
 
604
        while (*name != '\0') {
605
                if (origin != NULL && strcasecmp(name, origin) == 0)
606
                        return (name - oname - (name > oname));
607
                while (*name != '\0') {
608
                        if (*name == '\\') {
609
                                name++;
610
                                /* XXX need to handle \nnn form. */
611
                                if (*name == '\0')
612
                                        break;
613
                        } else if (*name == '.') {
614
                                name++;
615
                                break;
616
                        }
617
                        name++;
618
                }
619
        }
620
        return (name - oname);
621
}
622
 
623
/*
624
 * int
625
 * charstr(rdata, edata, buf, buflen)
626
 *      Format a <character-string> into the presentation buffer.
627
 * return:
628
 *      Number of rdata octets consumed
629
 *      0 for protocol format error
630
 *      -1 for output buffer error
631
 * side effects:
632
 *      buffer is advanced on success.
633
 */
634
static int
635
charstr(const u_char *rdata, const u_char *edata, char **buf, size_t *buflen) {
636
        const u_char *odata = rdata;
637
        size_t save_buflen = *buflen;
638
        char *save_buf = *buf;
639
 
640
        if (addstr("\"", 1, buf, buflen) < 0)
641
                goto enospc;
642
        if (rdata < edata) {
643
                int n = *rdata;
644
 
645
                if (rdata + 1 + n <= edata) {
646
                        rdata++;
647
                        while (n-- > 0) {
648
                                if (strchr("\n\"\\", *rdata) != NULL)
649
                                        if (addstr("\\", 1, buf, buflen) < 0)
650
                                                goto enospc;
651
                                if (addstr((const char *)rdata, 1,
652
                                           buf, buflen) < 0)
653
                                        goto enospc;
654
                                rdata++;
655
                        }
656
                }
657
        }
658
        if (addstr("\"", 1, buf, buflen) < 0)
659
                goto enospc;
660
        return (rdata - odata);
661
 enospc:
662
        errno = ENOSPC;
663
        *buf = save_buf;
664
        *buflen = save_buflen;
665
        return (-1);
666
}
667
 
668
static int
669
addname(const u_char *msg, size_t msglen,
670
        const u_char **pp, const char *origin,
671
        char **buf, size_t *buflen)
672
{
673
        size_t newlen, save_buflen = *buflen;
674
        char *save_buf = *buf;
675
        int n;
676
 
677
        n = dn_expand(msg, msg + msglen, *pp, *buf, *buflen);
678
        if (n < 0)
679
                goto enospc;    /* Guess. */
680
        newlen = prune_origin(*buf, origin);
681
        if ((origin == NULL || origin[0] == '\0' || (*buf)[newlen] == '\0') &&
682
            (newlen == 0 || (*buf)[newlen - 1] != '.')) {
683
                /* No trailing dot. */
684
                if (newlen + 2 > *buflen)
685
                        goto enospc;    /* No room for ".\0". */
686
                (*buf)[newlen++] = '.';
687
                (*buf)[newlen] = '\0';
688
        }
689
        if (newlen == 0) {
690
                /* Use "@" instead of name. */
691
                if (newlen + 2 > *buflen)
692
                        goto enospc;        /* No room for "@\0". */
693
                (*buf)[newlen++] = '@';
694
                (*buf)[newlen] = '\0';
695
        }
696
        *pp += n;
697
        addlen(newlen, buf, buflen);
698
        **buf = '\0';
699
        return (newlen);
700
 enospc:
701
        errno = ENOSPC;
702
        *buf = save_buf;
703
        *buflen = save_buflen;
704
        return (-1);
705
}
706
 
707
static void
708
addlen(size_t len, char **buf, size_t *buflen) {
709
        assert(len <= *buflen);
710
        *buf += len;
711
        *buflen -= len;
712
}
713
 
714
static int
715
addstr(const char *src, size_t len, char **buf, size_t *buflen) {
716
        if (len > *buflen) {
717
                errno = ENOSPC;
718
                return (-1);
719
        }
720
        memcpy(*buf, src, len);
721
        addlen(len, buf, buflen);
722
        **buf = '\0';
723
        return (0);
724
}
725
 
726
static int
727
addtab(size_t len, size_t target, int spaced, char **buf, size_t *buflen) {
728
        size_t save_buflen = *buflen;
729
        char *save_buf = *buf;
730
        int t;
731
 
732
        if (spaced || len >= target - 1) {
733
                T(addstr("  ", 2, buf, buflen));
734
                spaced = 1;
735
        } else {
736
                for (t = (target - len - 1) / 8; t >= 0; t--)
737
                        if (addstr("\t", 1, buf, buflen) < 0) {
738
                                *buflen = save_buflen;
739
                                *buf = save_buf;
740
                                return (-1);
741
                        }
742
                spaced = 0;
743
        }
744
        return (spaced);
745
}

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