1 /* $NetBSD: args.c,v 1.42 2022/01/14 23:55:16 christos Exp $ */
2
3 /*-
4 * Copyright (c) 1991, 1993, 1994
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Keith Muller of the University of California, San Diego and Lance
9 * Visser of Convex Computer Corporation.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include <sys/cdefs.h>
37 #ifndef lint
38 #if 0
39 static char sccsid[] = "@(#)args.c 8.3 (Berkeley) 4/2/94";
40 #else
41 __RCSID("$NetBSD: args.c,v 1.42 2022/01/14 23:55:16 christos Exp $");
42 #endif
43 #endif /* not lint */
44
45 #include <sys/types.h>
46 #include <sys/time.h>
47
48 #ifndef NO_IOFLAG
49 #include <fcntl.h>
50 #endif /* NO_IOFLAG */
51 #include <err.h>
52 #include <errno.h>
53 #include <limits.h>
54 #include <stdio.h>
55 #include <stdlib.h>
56 #include <string.h>
57
58 #include "dd.h"
59 #include "extern.h"
60
61 static int c_arg(const void *, const void *);
62
63 #ifdef NO_MSGFMT
64 static void f_msgfmt(char *) __dead;
65 #else
66 static void f_msgfmt(char *);
67 #endif /* NO_MSGFMT */
68
69 #ifdef NO_CONV
70 static void f_conv(char *) __dead;
71 #else
72 static void f_conv(char *);
73 static int c_conv(const void *, const void *);
74 #endif /* NO_CONV */
75
76 #ifdef NO_IOFLAG
77 static void f_iflag(char *) __dead;
78 static void f_oflag(char *) __dead;
79 #else
80 static void f_iflag(char *);
81 static void f_oflag(char *);
82 static u_int f_ioflag(char *, u_int);
83 static int c_ioflag(const void *, const void *);
84 #endif /* NO_IOFLAG */
85
86 static void f_bs(char *);
87 static void f_cbs(char *);
88 static void f_count(char *);
89 static void f_files(char *);
90 static void f_ibs(char *);
91 static void f_if(char *);
92 static void f_obs(char *);
93 static void f_of(char *);
94 static void f_seek(char *);
95 static void f_skip(char *);
96 static void f_progress(char *);
97
98 static const struct arg {
99 const char *name;
100 void (*f)(char *);
101 u_int set, noset;
102 } args[] = {
103 /* the array needs to be sorted by the first column so
104 bsearch() can be used to find commands quickly */
105 { "bs", f_bs, C_BS, C_BS|C_IBS|C_OBS|C_OSYNC },
106 { "cbs", f_cbs, C_CBS, C_CBS },
107 { "conv", f_conv, 0, 0 },
108 { "count", f_count, C_COUNT, C_COUNT },
109 { "files", f_files, C_FILES, C_FILES },
110 { "ibs", f_ibs, C_IBS, C_BS|C_IBS },
111 { "if", f_if, C_IF, C_IF },
112 { "iflag", f_iflag, C_IFLAG, C_IFLAG },
113 { "iseek", f_skip, C_SKIP, C_SKIP },
114 { "msgfmt", f_msgfmt, 0, 0 },
115 { "obs", f_obs, C_OBS, C_BS|C_OBS },
116 { "of", f_of, C_OF, C_OF },
117 { "oflag", f_oflag, C_OFLAG, C_OFLAG },
118 { "oseek", f_seek, C_SEEK, C_SEEK },
119 { "progress", f_progress, 0, 0 },
120 { "seek", f_seek, C_SEEK, C_SEEK },
121 { "skip", f_skip, C_SKIP, C_SKIP },
122 };
123
124 /*
125 * args -- parse JCL syntax of dd.
126 */
127 void
jcl(char ** argv)128 jcl(char **argv)
129 {
130 const struct arg *ap;
131 struct arg tmp;
132 char *oper, *arg;
133
134 in.dbsz = out.dbsz = 512;
135
136 while ((oper = *++argv) != NULL) {
137 if ((oper = strdup(oper)) == NULL) {
138 errx(EXIT_FAILURE,
139 "unable to allocate space for the argument %s",
140 *argv);
141 /* NOTREACHED */
142 }
143 if ((arg = strchr(oper, '=')) == NULL) {
144 errx(EXIT_FAILURE, "unknown operand %s", oper);
145 /* NOTREACHED */
146 }
147 *arg++ = '\0';
148 if (!*arg) {
149 errx(EXIT_FAILURE, "no value specified for %s", oper);
150 /* NOTREACHED */
151 }
152 tmp.name = oper;
153 if (!(ap = bsearch(&tmp, args,
154 __arraycount(args), sizeof(*args), c_arg))) {
155 errx(EXIT_FAILURE, "unknown operand %s", tmp.name);
156 /* NOTREACHED */
157 }
158 if (ddflags & ap->noset) {
159 errx(EXIT_FAILURE,
160 "%s: illegal argument combination or already set",
161 tmp.name);
162 /* NOTREACHED */
163 }
164 ddflags |= ap->set;
165 ap->f(arg);
166 }
167
168 /* Final sanity checks. */
169
170 if (ddflags & C_BS) {
171 /*
172 * Bs is turned off by any conversion -- we assume the user
173 * just wanted to set both the input and output block sizes
174 * and didn't want the bs semantics, so we don't warn.
175 */
176 if (ddflags & (C_BLOCK | C_LCASE | C_SWAB | C_UCASE |
177 C_UNBLOCK | C_OSYNC | C_ASCII | C_EBCDIC | C_SPARSE)) {
178 ddflags &= ~C_BS;
179 ddflags |= C_IBS|C_OBS;
180 }
181
182 /* Bs supersedes ibs and obs. */
183 if (ddflags & C_BS && ddflags & (C_IBS|C_OBS))
184 warnx("bs supersedes ibs and obs");
185 }
186
187 /*
188 * Ascii/ebcdic and cbs implies block/unblock.
189 * Block/unblock requires cbs and vice-versa.
190 */
191 if (ddflags & (C_BLOCK|C_UNBLOCK)) {
192 if (!(ddflags & C_CBS)) {
193 errx(EXIT_FAILURE, "record operations require cbs");
194 /* NOTREACHED */
195 }
196 cfunc = ddflags & C_BLOCK ? block : unblock;
197 } else if (ddflags & C_CBS) {
198 if (ddflags & (C_ASCII|C_EBCDIC)) {
199 if (ddflags & C_ASCII) {
200 ddflags |= C_UNBLOCK;
201 cfunc = unblock;
202 } else {
203 ddflags |= C_BLOCK;
204 cfunc = block;
205 }
206 } else {
207 errx(EXIT_FAILURE,
208 "cbs meaningless if not doing record operations");
209 /* NOTREACHED */
210 }
211 } else
212 cfunc = def;
213
214 /* Read, write and seek calls take off_t as arguments.
215 *
216 * The following check is not done because an off_t is a quad
217 * for current NetBSD implementations.
218 *
219 * if (in.offset > INT_MAX/in.dbsz || out.offset > INT_MAX/out.dbsz)
220 * errx(1, "seek offsets cannot be larger than %d", INT_MAX);
221 */
222 }
223
224 static int
c_arg(const void * a,const void * b)225 c_arg(const void *a, const void *b)
226 {
227
228 return (strcmp(((const struct arg *)a)->name,
229 ((const struct arg *)b)->name));
230 }
231
232 static void
f_bs(char * arg)233 f_bs(char *arg)
234 {
235
236 in.dbsz = out.dbsz = strsuftoll("block size", arg, 1, UINT_MAX);
237 }
238
239 static void
f_cbs(char * arg)240 f_cbs(char *arg)
241 {
242
243 cbsz = strsuftoll("conversion record size", arg, 1, UINT_MAX);
244 }
245
246 static void
f_count(char * arg)247 f_count(char *arg)
248 {
249
250 cpy_cnt = strsuftoll("block count", arg, 0, LLONG_MAX);
251 if (!cpy_cnt)
252 terminate(0);
253 }
254
255 static void
f_files(char * arg)256 f_files(char *arg)
257 {
258
259 files_cnt = (u_int)strsuftoll("file count", arg, 0, UINT_MAX);
260 if (!files_cnt)
261 terminate(0);
262 }
263
264 static void
f_ibs(char * arg)265 f_ibs(char *arg)
266 {
267
268 if (!(ddflags & C_BS))
269 in.dbsz = strsuftoll("input block size", arg, 1, UINT_MAX);
270 }
271
272 static void
f_if(char * arg)273 f_if(char *arg)
274 {
275
276 in.name = arg;
277 }
278
279 #ifdef NO_MSGFMT
280 /* Build a small version (i.e. for a ramdisk root) */
281 static void
f_msgfmt(char * arg)282 f_msgfmt(char *arg)
283 {
284
285 errx(EXIT_FAILURE, "msgfmt option disabled");
286 /* NOTREACHED */
287 }
288 #else /* NO_MSGFMT */
289 static void
f_msgfmt(char * arg)290 f_msgfmt(char *arg)
291 {
292
293 /*
294 * If the format string is not valid, dd_write_msg() will print
295 * an error and exit.
296 */
297 dd_write_msg(arg, 0);
298
299 msgfmt = arg;
300 }
301 #endif /* NO_MSGFMT */
302
303 static void
f_obs(char * arg)304 f_obs(char *arg)
305 {
306
307 if (!(ddflags & C_BS))
308 out.dbsz = strsuftoll("output block size", arg, 1, UINT_MAX);
309 }
310
311 static void
f_of(char * arg)312 f_of(char *arg)
313 {
314
315 out.name = arg;
316 }
317
318 static void
f_seek(char * arg)319 f_seek(char *arg)
320 {
321
322 out.offset = strsuftoll("seek blocks", arg, 0, LLONG_MAX);
323 }
324
325 static void
f_skip(char * arg)326 f_skip(char *arg)
327 {
328
329 in.offset = strsuftoll("skip blocks", arg, 0, LLONG_MAX);
330 }
331
332 static void
f_progress(char * arg)333 f_progress(char *arg)
334 {
335
336 progress = strsuftoll("progress blocks", arg, 0, LLONG_MAX);
337 }
338
339 #ifdef NO_CONV
340 /* Build a small version (i.e. for a ramdisk root) */
341 static void
f_conv(char * arg)342 f_conv(char *arg)
343 {
344
345 errx(EXIT_FAILURE, "conv option disabled");
346 /* NOTREACHED */
347 }
348 #else /* NO_CONV */
349
350 static const struct conv {
351 const char *name;
352 u_int set, noset;
353 const u_char *ctab;
354 } clist[] = {
355 { "ascii", C_ASCII, C_EBCDIC, e2a_POSIX },
356 { "block", C_BLOCK, C_UNBLOCK, NULL },
357 { "ebcdic", C_EBCDIC, C_ASCII, a2e_POSIX },
358 { "ibm", C_EBCDIC, C_ASCII, a2ibm },
359 { "lcase", C_LCASE, C_UCASE, NULL },
360 { "noerror", C_NOERROR, 0, NULL },
361 { "notrunc", C_NOTRUNC, 0, NULL },
362 { "oldascii", C_ASCII, C_EBCDIC, e2a_32V },
363 { "oldebcdic", C_EBCDIC, C_ASCII, a2e_32V },
364 { "oldibm", C_EBCDIC, C_ASCII, a2ibm },
365 { "osync", C_OSYNC, C_BS, NULL },
366 { "sparse", C_SPARSE, 0, NULL },
367 { "swab", C_SWAB, 0, NULL },
368 { "sync", C_SYNC, 0, NULL },
369 { "ucase", C_UCASE, C_LCASE, NULL },
370 { "unblock", C_UNBLOCK, C_BLOCK, NULL },
371 /* If you add items to this table, be sure to add the
372 * conversions to the C_BS check in the jcl routine above.
373 */
374 };
375
376 static void
f_conv(char * arg)377 f_conv(char *arg)
378 {
379 const struct conv *cp;
380 struct conv tmp;
381
382 while (arg != NULL) {
383 tmp.name = strsep(&arg, ",");
384 if (!(cp = bsearch(&tmp, clist,
385 __arraycount(clist), sizeof(*clist), c_conv))) {
386 errx(EXIT_FAILURE, "unknown conversion %s", tmp.name);
387 /* NOTREACHED */
388 }
389 if (ddflags & cp->noset) {
390 errx(EXIT_FAILURE,
391 "%s: illegal conversion combination", tmp.name);
392 /* NOTREACHED */
393 }
394 ddflags |= cp->set;
395 if (cp->ctab)
396 ctab = cp->ctab;
397 }
398 }
399
400 static int
c_conv(const void * a,const void * b)401 c_conv(const void *a, const void *b)
402 {
403
404 return (strcmp(((const struct conv *)a)->name,
405 ((const struct conv *)b)->name));
406 }
407
408 #endif /* NO_CONV */
409
410 static void
f_iflag(char * arg)411 f_iflag(char *arg)
412 {
413 /* Build a small version (i.e. for a ramdisk root) */
414 #ifdef NO_IOFLAG
415 errx(EXIT_FAILURE, "iflag option disabled");
416 /* NOTREACHED */
417 #else
418 iflag = f_ioflag(arg, C_IFLAG);
419 return;
420 #endif
421 }
422
423 static void
f_oflag(char * arg)424 f_oflag(char *arg)
425 {
426 /* Build a small version (i.e. for a ramdisk root) */
427 #ifdef NO_IOFLAG
428 errx(EXIT_FAILURE, "oflag option disabled");
429 /* NOTREACHED */
430 #else
431 oflag = f_ioflag(arg, C_OFLAG);
432 return;
433 #endif
434 }
435
436 #ifndef NO_IOFLAG
437 static const struct ioflag {
438 const char *name;
439 u_int set;
440 u_int allowed;
441 } olist[] = {
442 /* the array needs to be sorted by the first column so
443 bsearch() can be used to find commands quickly */
444 { "alt_io", O_ALT_IO, C_IFLAG|C_OFLAG },
445 { "append", O_APPEND, C_OFLAG },
446 { "async", O_ASYNC, C_IFLAG|C_OFLAG },
447 { "cloexec", O_CLOEXEC, C_IFLAG|C_OFLAG },
448 { "creat", O_CREAT, C_OFLAG },
449 { "direct", O_DIRECT, C_IFLAG|C_OFLAG },
450 { "directory", O_DIRECTORY, C_NONE },
451 { "dsync", O_DSYNC, C_OFLAG },
452 { "excl", O_EXCL, C_OFLAG },
453 { "exlock", O_EXLOCK, C_IFLAG|C_OFLAG },
454 { "noctty", O_NOCTTY, C_IFLAG|C_OFLAG },
455 { "nofollow", O_NOFOLLOW, C_IFLAG|C_OFLAG },
456 { "nonblock", O_NONBLOCK, C_IFLAG|C_OFLAG },
457 { "nosigpipe", O_NOSIGPIPE, C_IFLAG|C_OFLAG },
458 { "rdonly", O_RDONLY, C_IFLAG },
459 { "rdwr", O_RDWR, C_IFLAG },
460 { "rsync", O_RSYNC, C_IFLAG },
461 { "shlock", O_SHLOCK, C_IFLAG|C_OFLAG },
462 { "sync", O_SYNC, C_IFLAG|C_OFLAG },
463 { "trunc", O_TRUNC, C_OFLAG },
464 { "wronly", O_WRONLY, C_OFLAG },
465 };
466
467 static u_int
f_ioflag(char * arg,u_int flagtype)468 f_ioflag(char *arg, u_int flagtype)
469 {
470 u_int ioflag = 0;
471 const struct ioflag *cp;
472 struct ioflag tmp;
473 const char *flagstr = (flagtype == C_IFLAG) ? "iflag" : "oflag";
474
475 while (arg != NULL) {
476 tmp.name = strsep(&arg, ",");
477 if (!(cp = bsearch(&tmp, olist,
478 __arraycount(olist), sizeof(*olist), c_ioflag))) {
479 errx(EXIT_FAILURE, "unknown %s %s", flagstr, tmp.name);
480 /* NOTREACHED */
481 }
482
483 if ((cp->set & O_ACCMODE) && (flagtype == C_OFLAG)) {
484 warnx("rdonly, rdwr and wronly are ignored for oflag");
485 continue;
486 }
487
488 if ((cp->allowed & flagtype) == 0) {
489 warnx("%s set for %s but makes no sense",
490 cp->name, flagstr);
491 }
492
493 ioflag |= cp->set;
494 }
495
496
497 return ioflag;
498 }
499
500 static int
c_ioflag(const void * a,const void * b)501 c_ioflag(const void *a, const void *b)
502 {
503
504 return (strcmp(((const struct ioflag *)a)->name,
505 ((const struct ioflag *)b)->name));
506 }
507 #endif /* NO_IOFLAG */
508