kmodloader: added -a arg to modprobe
[project/ubox.git] / validate / validate.c
1 /*
2 * Copyright (C) 2013 Jo-Philipp Wich <jow@openwrt.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU Lesser General Public License version 2.1
6 * as published by the Free Software Foundation
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 */
13
14 #include <stdio.h>
15 #include <stdlib.h>
16 #include <string.h>
17 #include <stdbool.h>
18 #include <ctype.h>
19
20 #include <arpa/inet.h>
21 #include <netinet/ether.h>
22 #include <sys/stat.h>
23
24 #include <sys/types.h>
25 #include <regex.h>
26
27 #include <uci.h>
28
29 #include "libvalidate.h"
30
31 enum dt_optype {
32 OP_UNKNOWN,
33 OP_NUMBER,
34 OP_STRING,
35 OP_FUNCTION
36 };
37
38 struct dt_fun;
39
40 struct dt_op {
41 enum dt_optype type;
42 const char *next;
43 int length;
44 int nextop;
45 union {
46 bool boolean;
47 double number;
48 const char *string;
49 struct dt_fun *function;
50 } value;
51 };
52
53 struct dt_state {
54 int pos;
55 int depth;
56 struct uci_context *ctx;
57 const char *value;
58 enum dt_type valtype;
59 struct dt_op stack[32];
60 };
61
62 struct dt_fun {
63 const char *name;
64 enum dt_type valtype;
65 bool (*call)(struct dt_state *s, int nargs);
66 };
67
68 static bool
69 dt_test_number(double number, const char *value)
70 {
71 char *e;
72 double n;
73
74 n = strtod(value, &e);
75
76 return (e > value && *e == 0 && n == number);
77 }
78
79 static bool
80 dt_test_string(const char *s, const char *end, const char *value)
81 {
82 bool esc = false;
83
84 while (*value)
85 {
86 if (s > end)
87 return false;
88
89 if (!esc && *s == '\\')
90 {
91 s++;
92
93 if (s >= end)
94 break;
95
96 esc = true;
97 continue;
98 }
99
100 if (*s != *value)
101 return false;
102
103 esc = false;
104 value++;
105 s++;
106 }
107
108 return (*s == *value || (s >= end && *value == 0));
109 }
110
111 static bool
112 dt_step(struct dt_state *s);
113
114 static bool
115 dt_call(struct dt_state *s);
116
117 #define dt_getint(n, v) \
118 ((n < nargs && s->stack[s->pos + n].type == OP_NUMBER) \
119 ? (v = s->stack[s->pos + n].value.number, 1) : 0)
120
121 static bool
122 dt_type_or(struct dt_state *s, int nargs)
123 {
124 while (nargs--)
125 if (dt_step(s))
126 return true;
127
128 return false;
129 }
130
131 static bool
132 dt_type_and(struct dt_state *s, int nargs)
133 {
134 while (nargs--)
135 if (!dt_step(s))
136 return false;
137
138 return true;
139 }
140
141 static bool
142 dt_type_not(struct dt_state *s, int nargs)
143 {
144 if (!nargs)
145 return false;
146
147 return !dt_step(s);
148 }
149
150 static bool
151 dt_type_neg(struct dt_state *s, int nargs)
152 {
153 bool rv;
154 const char *value = s->value;
155
156 if (!nargs)
157 return false;
158
159 if (*s->value == '!')
160 while (isspace(*++s->value));
161
162 rv = dt_step(s);
163 s->value = value;
164
165 return rv;
166 }
167
168 static bool
169 dt_type_list(struct dt_state *s, int nargs)
170 {
171 bool rv = true;
172 int pos = s->pos;
173 char *p, *str = strdup(s->value);
174 const char *value = s->value;
175
176 if (!str || !nargs) {
177 free(str);
178 return false;
179 }
180
181 for (p = strtok(str, " \t"); p; p = strtok(NULL, " \t"))
182 {
183 s->value = p;
184
185 if (!dt_step(s))
186 {
187 rv = false;
188 break;
189 }
190
191 s->pos = pos;
192 }
193
194 s->value = value;
195 free(str);
196
197 return rv;
198 }
199
200 static bool
201 dt_type_min(struct dt_state *s, int nargs)
202 {
203 int n;
204 int min = 0;
205 char *e;
206
207 if (dt_getint(0, min))
208 {
209 n = strtol(s->value, &e, 0);
210 return (e > s->value && *e == 0 && n >= min);
211 }
212
213 return false;
214 }
215
216 static bool
217 dt_type_max(struct dt_state *s, int nargs)
218 {
219 int n;
220 int max = 0;
221 char *e;
222
223 if (dt_getint(0, max))
224 {
225 n = strtol(s->value, &e, 0);
226 return (e > s->value && *e == 0 && n <= max);
227 }
228
229 return false;
230 }
231
232 static bool
233 dt_type_range(struct dt_state *s, int nargs)
234 {
235 int n;
236 int min = 0;
237 int max = 0;
238 char *e;
239
240 if (dt_getint(0, min) && dt_getint(1, max))
241 {
242 n = strtol(s->value, &e, 0);
243 return (e > s->value && *e == 0 && n >= min && n <= max);
244 }
245
246 return false;
247 }
248
249 static bool
250 dt_type_minlen(struct dt_state *s, int nargs)
251 {
252 int min = 0;
253
254 if (dt_getint(0, min))
255 return (strlen(s->value) >= min);
256
257 return false;
258 }
259
260 static bool
261 dt_type_maxlen(struct dt_state *s, int nargs)
262 {
263 int max = 0;
264
265 if (dt_getint(0, max))
266 return (strlen(s->value) <= max);
267
268 return false;
269 }
270
271 static bool
272 dt_type_rangelen(struct dt_state *s, int nargs)
273 {
274 int min = 0;
275 int max = 0;
276 int len = strlen(s->value);
277
278 if (dt_getint(0, min) && dt_getint(1, max))
279 return (len >= min && len <= max);
280
281 return false;
282 }
283
284 static bool
285 dt_type_int(struct dt_state *s, int nargs)
286 {
287 char *e;
288 int base = 0;
289
290 if (!isxdigit(*s->value) && *s->value != '-')
291 return false;
292
293 dt_getint(0, base);
294 strtol(s->value, &e, base);
295
296 return (e > s->value && *e == 0);
297 }
298
299 static bool
300 dt_type_uint(struct dt_state *s, int nargs)
301 {
302 char *e;
303 int base = 0;
304
305 if (!isxdigit(*s->value))
306 return false;
307
308 dt_getint(0, base);
309 strtoul(s->value, &e, base);
310
311 return (e > s->value && *e == 0);
312 }
313
314 static bool
315 dt_type_float(struct dt_state *s, int nargs)
316 {
317 char *e;
318
319 strtod(s->value, &e);
320
321 return (e > s->value && *e == 0);
322 }
323
324 static bool
325 dt_type_ufloat(struct dt_state *s, int nargs)
326 {
327 int n;
328 char *e;
329
330 n = strtod(s->value, &e);
331
332 return (e > s->value && *e == 0 && n >= 0.0);
333 }
334
335 static bool
336 dt_type_bool(struct dt_state *s, int nargs)
337 {
338 int i;
339 const char *values[] = {
340 "0", "off", "false", "no", "disabled",
341 "1", "on", "true", "yes", "enabled"
342 };
343
344 for (i = 0; i < sizeof(values) / sizeof(values[0]); i++)
345 if (!strcasecmp(values[i], s->value))
346 return true;
347
348 return false;
349 }
350
351 static bool
352 dt_type_string(struct dt_state *s, int nargs)
353 {
354 int min = 0;
355 int max = 0;
356 int len = strlen(s->value);
357
358 if (dt_getint(0, min) && (len < min))
359 return false;
360
361 if (dt_getint(1, max) && (len > max))
362 return false;
363
364 return true;
365 }
366
367 static bool
368 dt_type_hexstring(struct dt_state *s, int nargs)
369 {
370 int min = 0;
371 int max = 0;
372 int len = strlen(s->value);
373 const char *p;
374
375 if (len % 2)
376 return false;
377
378 if (dt_getint(0, min) && (len < min))
379 return false;
380
381 if (dt_getint(1, max) && (len > max))
382 return false;
383
384 for (p = s->value; *p; p++)
385 if (!isxdigit(*p))
386 return false;
387
388 return true;
389 }
390
391 static bool
392 dt_type_ip4addr(struct dt_state *s, int nargs)
393 {
394 struct in6_addr a;
395 return inet_pton(AF_INET, s->value, &a);
396 }
397
398 static bool
399 dt_type_ip6addr(struct dt_state *s, int nargs)
400 {
401 struct in6_addr a;
402 return inet_pton(AF_INET6, s->value, &a);
403 }
404
405 static bool
406 dt_type_ipaddr(struct dt_state *s, int nargs)
407 {
408 return (dt_type_ip4addr(s, 0) || dt_type_ip6addr(s, 0));
409 }
410
411 static bool
412 dt_type_netmask4(struct dt_state *s, int nargs)
413 {
414 int i;
415 struct in_addr a;
416
417 if (!inet_pton(AF_INET, s->value, &a))
418 return false;
419
420 if (a.s_addr == 0)
421 return true;
422
423 a.s_addr = ntohl(a.s_addr);
424
425 for (i = 0; (i < 32) && !(a.s_addr & (1 << i)); i++);
426
427 return ((uint32_t)(~((1 << i) - 1)) == a.s_addr);
428 }
429
430 static bool
431 dt_type_netmask6(struct dt_state *s, int nargs)
432 {
433 int i;
434 struct in6_addr a;
435
436 if (!inet_pton(AF_INET6, s->value, &a))
437 return false;
438
439 for (i = 0; (i < 16) && (a.s6_addr[i] == 0xFF); i++);
440
441 if (i == 16)
442 return true;
443
444 if ((a.s6_addr[i] != 255) && (a.s6_addr[i] != 254) &&
445 (a.s6_addr[i] != 252) && (a.s6_addr[i] != 248) &&
446 (a.s6_addr[i] != 240) && (a.s6_addr[i] != 224) &&
447 (a.s6_addr[i] != 192) && (a.s6_addr[i] != 128) &&
448 (a.s6_addr[i] != 0))
449 return false;
450
451 for (; (i < 16) && (a.s6_addr[i] == 0); i++);
452
453 return (i == 16);
454 }
455
456 static bool
457 dt_type_cidr4(struct dt_state *s, int nargs)
458 {
459 int n;
460 struct in_addr a;
461 char *p, buf[sizeof("255.255.255.255/32\0")];
462
463 if (strlen(s->value) >= sizeof(buf))
464 return false;
465
466 strcpy(buf, s->value);
467 p = strchr(buf, '/');
468
469 if (p)
470 {
471 *p++ = 0;
472
473 n = strtoul(p, &p, 10);
474
475 if ((*p != 0) || (n > 32))
476 return false;
477 }
478
479 return inet_pton(AF_INET, buf, &a);
480 }
481
482 static bool
483 dt_type_cidr6(struct dt_state *s, int nargs)
484 {
485 int n;
486 struct in6_addr a;
487 char *p, buf[sizeof("FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:255.255.255.255/128\0")];
488
489 if (strlen(s->value) >= sizeof(buf))
490 return false;
491
492 strcpy(buf, s->value);
493 p = strchr(buf, '/');
494
495 if (p)
496 {
497 *p++ = 0;
498
499 n = strtoul(p, &p, 10);
500
501 if ((*p != 0) || (n > 128))
502 return false;
503 }
504
505 return inet_pton(AF_INET6, buf, &a);
506 }
507
508 static bool
509 dt_type_cidr(struct dt_state *s, int nargs)
510 {
511 return (dt_type_cidr4(s, 0) || dt_type_cidr6(s, 0));
512 }
513
514 static bool
515 dt_type_ipmask4(struct dt_state *s, int nargs)
516 {
517 bool rv;
518 struct in_addr a;
519 const char *value;
520 char *p, buf[sizeof("255.255.255.255/255.255.255.255\0")];
521
522 if (strlen(s->value) >= sizeof(buf))
523 return false;
524
525 strcpy(buf, s->value);
526 p = strchr(buf, '/');
527
528 if (p)
529 {
530 *p++ = 0;
531
532 value = s->value;
533 s->value = p;
534 rv = dt_type_netmask4(s, 0);
535 s->value = value;
536
537 if (!rv)
538 return false;
539 }
540
541 return inet_pton(AF_INET, buf, &a);
542 }
543
544 static bool
545 dt_type_ipmask6(struct dt_state *s, int nargs)
546 {
547 bool rv;
548 struct in6_addr a;
549 const char *value;
550 char *p, buf[sizeof("FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:255.255.255.255/"
551 "FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:255.255.255.255\0")];
552
553 if (strlen(s->value) >= sizeof(buf))
554 return false;
555
556 strcpy(buf, s->value);
557 p = strchr(buf, '/');
558
559 if (p)
560 {
561 *p++ = 0;
562
563 value = s->value;
564 s->value = p;
565 rv = dt_type_netmask6(s, 0);
566 s->value = value;
567
568 if (!rv)
569 return false;
570 }
571
572 return inet_pton(AF_INET6, buf, &a);
573 }
574
575 static bool
576 dt_type_ipmask(struct dt_state *s, int nargs)
577 {
578 return (dt_type_ipmask4(s, 0) || dt_type_ipmask6(s, 0));
579 }
580
581 static bool
582 dt_type_port(struct dt_state *s, int nargs)
583 {
584 int n;
585 char *e;
586
587 n = strtoul(s->value, &e, 10);
588
589 return (e > s->value && *e == 0 && n <= 65535);
590 }
591
592 static bool
593 dt_type_portrange(struct dt_state *s, int nargs)
594 {
595 int n, m;
596 char *e;
597
598 n = strtoul(s->value, &e, 10);
599
600 if (e == s->value || *e != '-')
601 return false;
602
603 m = strtoul(e + 1, &e, 10);
604
605 return (*e == 0 && n <= 65535 && m <= 65535 && n <= m);
606 }
607
608 static bool
609 dt_type_macaddr(struct dt_state *s, int nargs)
610 {
611 return !!ether_aton(s->value);
612 }
613
614 static bool
615 dt_type_uciname(struct dt_state *s, int nargs)
616 {
617 const char *p;
618
619 for (p = s->value;
620 *p && ((*p >= 'A' && *p <= 'Z') || (*p >= 'a' && *p <= 'z') ||
621 (*p >= '0' && *p <= '9') || (*p == '_'));
622 p++);
623
624 return (*p == 0);
625 }
626
627 static bool
628 dt_type_wpakey(struct dt_state *s, int nargs)
629 {
630 int len = strlen(s->value);
631 const char *p = s->value;
632
633 if (len == 64)
634 {
635 while (isxdigit(*p))
636 p++;
637
638 return (*p == 0);
639 }
640
641 return (len >= 8 && len <= 63);
642 }
643
644 static bool
645 dt_type_wepkey(struct dt_state *s, int nargs)
646 {
647 int len = strlen(s->value);
648 const char *p = s->value;
649
650 if (!strncmp(p, "s:", 2))
651 {
652 len -= 2;
653 p += 2;
654 }
655
656 if (len == 10 || len == 26)
657 {
658 while (isxdigit(*p))
659 p++;
660
661 return (*p == 0);
662 }
663
664 return (len == 5 || len == 13);
665 }
666
667 static bool
668 dt_type_hostname(struct dt_state *s, int nargs)
669 {
670 const char *p, *last;
671
672 for (p = last = s->value; *p; p++)
673 {
674 if (*p == '.')
675 {
676 if ((p - last) == 0 || (p - last) > 63)
677 return false;
678
679 last = p + 1;
680 continue;
681 }
682 else if ((*p >= 'A' && *p <= 'Z') || (*p >= 'a' && *p <= 'z') ||
683 (*p >= '0' && *p <= '9') || (*p == '_') || (*p == '-'))
684 {
685 continue;
686 }
687
688 return false;
689 }
690
691 return ((p - last) > 0 && (p - last) <= 255);
692 }
693
694 static bool
695 dt_type_host(struct dt_state *s, int nargs)
696 {
697 return (dt_type_hostname(s, 0) || dt_type_ipaddr(s, 0));
698 }
699
700 static bool
701 dt_type_network(struct dt_state *s, int nargs)
702 {
703 return (dt_type_uciname(s, 0) || dt_type_host(s, 0));
704 }
705
706 static bool
707 dt_type_phonedigit(struct dt_state *s, int nargs)
708 {
709 const char *p;
710
711 for (p = s->value;
712 *p && ((*p >= '0' && *p <= '9') || (*p == '*') || (*p == '#') ||
713 (*p == '!') || (*p == '.'));
714 p++);
715
716 return (*p == 0);
717 }
718
719 static bool
720 dt_type_directory(struct dt_state *s, int nargs)
721 {
722 struct stat st;
723 return (!stat(s->value, &st) && S_ISDIR(st.st_mode));
724 }
725
726
727 static bool
728 dt_type_device(struct dt_state *s, int nargs)
729 {
730 struct stat st;
731 return (!stat(s->value, &st) &&
732 (S_ISBLK(st.st_mode) || S_ISCHR(st.st_mode)));
733 }
734
735 static bool
736 dt_type_file(struct dt_state *s, int nargs)
737 {
738 struct stat st;
739 return (!stat(s->value, &st) && S_ISREG(st.st_mode));
740 }
741
742 static bool
743 dt_type_regex(struct dt_state *s, int nargs)
744 {
745 bool rv;
746 int relen;
747 regex_t pattern;
748 char *re = NULL;
749
750 if (nargs < 1 || s->stack[s->pos].type != OP_STRING)
751 return false;
752
753 relen = s->stack[s->pos].length;
754 re = alloca(relen + 3);
755
756 if (!re)
757 return false;
758
759 memset(re, 0, relen + 3);
760 memcpy(re + 1, s->stack[s->pos].value.string, relen);
761
762 re[0] = '^';
763 re[relen + 1] = '$';
764
765 if (regcomp(&pattern, re, REG_EXTENDED | REG_NOSUB))
766 return false;
767
768 rv = !regexec(&pattern, s->value, 0, NULL, 0);
769
770 regfree(&pattern);
771
772 return rv;
773 }
774
775 static void *
776 dt_uci_lookup(struct dt_state *s, const char *pkg,
777 const char *sct, const char *opt, enum uci_type type)
778 {
779 struct uci_ptr ptr = {
780 .package = pkg,
781 .section = sct,
782 .option = opt
783 };
784
785 if (!s->ctx || uci_lookup_ptr(s->ctx, &ptr, NULL, false) ||
786 !(ptr.flags & UCI_LOOKUP_COMPLETE))
787 return NULL;
788
789 if (ptr.last->type != type)
790 return NULL;
791
792 switch (type)
793 {
794 case UCI_TYPE_PACKAGE:
795 return uci_to_package(ptr.last);
796
797 case UCI_TYPE_SECTION:
798 return uci_to_section(ptr.last);
799
800 case UCI_TYPE_OPTION:
801 return uci_to_option(ptr.last);
802
803 default:
804 return NULL;
805 }
806 }
807
808 static bool
809 dt_uci_cmp(struct dt_state *s,
810 const char *pkg, const char *sct, const char *opt)
811 {
812 struct uci_element *e;
813 struct uci_option *o = dt_uci_lookup(s, pkg, sct, opt, UCI_TYPE_OPTION);
814
815 if (!o)
816 return false;
817
818 switch (o->type)
819 {
820 case UCI_TYPE_STRING:
821 if (!strcmp(s->value, o->v.string))
822 return true;
823 break;
824
825 case UCI_TYPE_LIST:
826 uci_foreach_element(&o->v.list, e)
827 if (!strcmp(s->value, e->name))
828 return true;
829 break;
830 }
831
832 return false;
833 }
834
835 static bool
836 dt_type_uci(struct dt_state *s, int nargs)
837 {
838 int i, len;
839 struct uci_element *e;
840 struct uci_package *p;
841 char *cso[3] = { };
842
843 if (!s->ctx)
844 return false;
845
846 for (i = 0; i < nargs && i < 3; i++)
847 {
848 if (s->stack[s->pos + i].type != OP_STRING)
849 continue;
850
851 len = s->stack[s->pos + i].length;
852 cso[i] = alloca(len + 1);
853
854 if (!cso[i])
855 continue;
856
857 memset(cso[i], 0, len + 1);
858 memcpy(cso[i], s->stack[s->pos + i].value.string, len);
859 }
860
861 if (!cso[0] || !cso[1] || (*cso[1] != '@' && !cso[2]))
862 return false;
863
864 if (*cso[1] != '@')
865 return dt_uci_cmp(s, cso[0], cso[1], cso[2]);
866
867 p = dt_uci_lookup(s, cso[0], NULL, NULL, UCI_TYPE_PACKAGE);
868
869 if (!p)
870 return false;
871
872 uci_foreach_element(&p->sections, e)
873 {
874 if (strcmp(uci_to_section(e)->type, cso[1] + 1))
875 continue;
876
877 if (!cso[2])
878 {
879 if (!strcmp(s->value, e->name))
880 return true;
881 }
882 else
883 {
884 if (dt_uci_cmp(s, cso[0], e->name, cso[2]))
885 return true;
886 }
887 }
888
889 return false;
890 }
891
892
893 static struct dt_fun dt_types[] = {
894 { "or", DT_INVALID, dt_type_or },
895 { "and", DT_INVALID, dt_type_and },
896 { "not", DT_INVALID, dt_type_not },
897 { "neg", DT_INVALID, dt_type_neg },
898 { "list", DT_INVALID, dt_type_list },
899 { "min", DT_NUMBER, dt_type_min },
900 { "max", DT_NUMBER, dt_type_max },
901 { "range", DT_NUMBER, dt_type_range },
902 { "minlength", DT_STRING, dt_type_minlen },
903 { "maxlength", DT_STRING, dt_type_maxlen },
904 { "rangelength", DT_STRING, dt_type_rangelen },
905 { "integer", DT_NUMBER, dt_type_int },
906 { "uinteger", DT_NUMBER, dt_type_uint },
907 { "float", DT_NUMBER, dt_type_float },
908 { "ufloat", DT_NUMBER, dt_type_ufloat },
909 { "bool", DT_BOOL, dt_type_bool },
910 { "string", DT_STRING, dt_type_string },
911 { "hexstring", DT_STRING, dt_type_hexstring },
912 { "ip4addr", DT_STRING, dt_type_ip4addr },
913 { "ip6addr", DT_STRING, dt_type_ip6addr },
914 { "ipaddr", DT_STRING, dt_type_ipaddr },
915 { "cidr4", DT_STRING, dt_type_cidr4 },
916 { "cidr6", DT_STRING, dt_type_cidr6 },
917 { "cidr", DT_STRING, dt_type_cidr },
918 { "netmask4", DT_STRING, dt_type_netmask4 },
919 { "netmask6", DT_STRING, dt_type_netmask6 },
920 { "ipmask4", DT_STRING, dt_type_ipmask4 },
921 { "ipmask6", DT_STRING, dt_type_ipmask6 },
922 { "ipmask", DT_STRING, dt_type_ipmask },
923 { "port", DT_NUMBER, dt_type_port },
924 { "portrange", DT_STRING, dt_type_portrange },
925 { "macaddr", DT_STRING, dt_type_macaddr },
926 { "uciname", DT_STRING, dt_type_uciname },
927 { "wpakey", DT_STRING, dt_type_wpakey },
928 { "wepkey", DT_STRING, dt_type_wepkey },
929 { "hostname", DT_STRING, dt_type_hostname },
930 { "host", DT_STRING, dt_type_host },
931 { "network", DT_STRING, dt_type_network },
932 { "phonedigit", DT_STRING, dt_type_phonedigit },
933 { "directory", DT_STRING, dt_type_directory },
934 { "device", DT_STRING, dt_type_device },
935 { "file", DT_STRING, dt_type_file },
936 { "regex", DT_STRING, dt_type_regex },
937 { "uci", DT_STRING, dt_type_uci },
938
939 { }
940 };
941
942 static struct dt_fun *
943 dt_lookup_function(const char *s, const char *e)
944 {
945 struct dt_fun *fun = dt_types;
946
947 while (fun->name)
948 {
949 if (!strncmp(fun->name, s, e - s) && *(fun->name + (e - s)) == '\0')
950 return fun;
951
952 fun++;
953 }
954
955 return NULL;
956 }
957
958 static bool
959 dt_parse_atom(struct dt_state *s, const char *label, const char *end)
960 {
961 char q, *e;
962 const char *p;
963 bool esc;
964 double dval;
965 struct dt_fun *func;
966 struct dt_op *op = &s->stack[s->depth];
967
968 if ((s->depth + 1) >= (sizeof(s->stack) / sizeof(s->stack[0])))
969 {
970 printf("Syntax error, expression too long\n");
971 return false;
972 }
973
974 while (isspace(*label))
975 label++;
976
977 /* test whether label is a float */
978 dval = strtod(label, &e);
979
980 if (e > label)
981 {
982 op->next = e;
983 op->type = OP_NUMBER;
984 op->value.number = dval;
985 op->nextop = ++s->depth;
986
987 return true;
988 }
989 else if ((*label == '"') || (*label == '\''))
990 {
991 for (p = label + 1, q = *label, esc = false; p <= end; p++)
992 {
993 if (esc)
994 {
995 esc = false;
996 continue;
997 }
998 else if (*p == '\\')
999 {
1000 esc = true;
1001 continue;
1002 }
1003 else if (*p == q)
1004 {
1005 op->next = p + 1;
1006 op->type = OP_STRING;
1007 op->length = (p - label) - 1;
1008 op->value.string = label + 1;
1009 op->nextop = ++s->depth;
1010
1011 return true;
1012 }
1013 }
1014
1015 printf("Syntax error, unterminated string\n");
1016 return false;
1017 }
1018 else if (*label)
1019 {
1020 for (p = label;
1021 p <= end && ((*p >= 'A' && *p <= 'Z') ||
1022 (*p >= 'a' && *p <= 'z') ||
1023 (*p >= '0' && *p <= '9') ||
1024 (*p == '_'));
1025 p++);
1026
1027 func = dt_lookup_function(label, p);
1028
1029 if (!func)
1030 {
1031 printf("Syntax error, unrecognized function\n");
1032 return false;
1033 }
1034
1035 op->next = p;
1036 op->type = OP_FUNCTION;
1037 op->value.function = func;
1038 op->nextop = ++s->depth;
1039
1040 return true;
1041 }
1042
1043 printf("Syntax error, unexpected EOF\n");
1044 return false;
1045 }
1046
1047 static bool
1048 dt_parse_list(struct dt_state *s, const char *code, const char *end);
1049
1050 static bool
1051 dt_parse_expr(const char *code, const char *end, struct dt_state *s)
1052 {
1053 struct dt_op *tok;
1054
1055 if (!dt_parse_atom(s, code, end))
1056 return false;
1057
1058 tok = &s->stack[s->depth - 1];
1059
1060 while (isspace(*tok->next))
1061 tok->next++;
1062
1063 if (tok->type == OP_FUNCTION)
1064 {
1065 if (*tok->next == '(')
1066 {
1067 end--;
1068
1069 while (isspace(*end) && end > tok->next + 1)
1070 end--;
1071
1072 return dt_parse_list(s, tok->next + 1, end);
1073 }
1074 else if (tok->next == end)
1075 {
1076 return dt_parse_list(s, tok->next, tok->next);
1077 }
1078
1079 printf("Syntax error, expected '(' or EOF after function label\n");
1080 return false;
1081 }
1082 else if (tok->next == end)
1083 {
1084 return true;
1085 }
1086
1087 printf("Syntax error, expected ',' after literal\n");
1088 return false;
1089 }
1090
1091 static bool
1092 dt_parse_list(struct dt_state *s, const char *code, const char *end)
1093 {
1094 char c;
1095 bool esc;
1096 int nest;
1097 const char *p, *last;
1098 struct dt_op *fptr;
1099
1100 if (!code)
1101 return false;
1102
1103 fptr = &s->stack[s->depth - 1];
1104
1105 for (nest = 0, p = last = code, esc = false, c = *p;
1106 p <= end;
1107 p++, c = (p < end) ? *p : '\0')
1108 {
1109 if (esc)
1110 {
1111 esc = false;
1112 continue;
1113 }
1114
1115 switch (c)
1116 {
1117 case '\\':
1118 esc = true;
1119 break;
1120
1121 case '(':
1122 nest++;
1123 break;
1124
1125 case ')':
1126 nest--;
1127 break;
1128
1129 case ',':
1130 case '\0':
1131 if (nest <= 0)
1132 {
1133 if (p > last)
1134 {
1135 if (!dt_parse_expr(last, p, s))
1136 return false;
1137
1138 fptr->length++;
1139 }
1140
1141 last = p + 1;
1142 }
1143
1144 break;
1145 }
1146 }
1147
1148 fptr->nextop = s->depth;
1149 return true;
1150 }
1151
1152 static bool
1153 dt_step(struct dt_state *s)
1154 {
1155 bool rv;
1156 struct dt_op *op = &s->stack[s->pos];
1157
1158 switch (op->type)
1159 {
1160 case OP_NUMBER:
1161 rv = dt_test_number(op->value.number, s->value);
1162 if (rv)
1163 s->valtype = DT_NUMBER;
1164 break;
1165
1166 case OP_STRING:
1167 rv = dt_test_string(op->value.string, op->value.string + op->length, s->value);
1168 if (rv)
1169 s->valtype = DT_STRING;
1170 break;
1171
1172 case OP_FUNCTION:
1173 rv = dt_call(s);
1174 break;
1175
1176 default:
1177 rv = false;
1178 break;
1179 }
1180
1181 s->pos = op->nextop;
1182 return rv;
1183 }
1184
1185 static bool
1186 dt_call(struct dt_state *s)
1187 {
1188 bool rv;
1189 struct dt_op *fptr = &s->stack[s->pos];
1190 struct dt_fun *func = fptr->value.function;
1191
1192 s->pos++;
1193
1194 rv = func->call(s, fptr->length);
1195
1196 if (rv && func->valtype)
1197 s->valtype = func->valtype;
1198
1199 s->pos = fptr->nextop;
1200
1201 return rv;
1202 }
1203
1204 enum dt_type
1205 dt_parse(const char *code, const char *value)
1206 {
1207 enum dt_type rv = DT_INVALID;
1208
1209 struct dt_state s = {
1210 .depth = 1,
1211 .stack = {
1212 {
1213 .type = OP_FUNCTION,
1214 .value.function = &dt_types[0],
1215 .next = code
1216 }
1217 }
1218 };
1219
1220 if (!value || !*value)
1221 return false;
1222
1223 if (!dt_parse_list(&s, code, code + strlen(code)))
1224 return false;
1225
1226 s.ctx = uci_alloc_context();
1227 s.value = value;
1228
1229 if (dt_call(&s))
1230 rv = s.valtype;
1231
1232 if (s.ctx)
1233 uci_free_context(s.ctx);
1234
1235 return rv;
1236 }