1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
|
/* SPDX-FileCopyrightText: Yoran Heling <projects@yorhel.nl>
* SPDX-License-Identifier: MIT */
#define _GNU_SOURCE
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <spawn.h>
#include <regex.h>
#include <getopt.h>
/* TODO: There's no need for random access while processing a file. The
* parsing/processing/formatting steps are currently separated, but could
* really be done in a single step in a streaming fashion as well. That may or
* may not simplify the code, I haven't really investigated yet.
* (Output will have to be buffered either way, we wouldn't want to write
* anything if there's an error during processing)
*
* Also, the current implementation leaks memory everywhere.
* That's by design.
* Kind of.
*/
struct ctx {
char *fn;
int line, offset;
struct ctx *parent;
};
struct cfg_arg {
struct ctx ctx;
char *data;
struct cfg_arg *next;
};
struct cfg_directive {
struct ctx ctx;
char *name;
struct cfg_arg *args;
struct cfg_directive *body, *next;
};
static const struct cfg_directive _empty_body = {};
static struct cfg_directive *empty_body = (struct cfg_directive *)&_empty_body;
#define isAlpha(c) (((unsigned)(c)|32)-'a' < 26)
#define isNum(c) (((unsigned)(c))-'0' < 10)
#ifdef __GNUC__
__attribute__((noreturn, format(printf, 2, 3)))
#endif
static void die(const struct ctx *ctx, const char *fmt, ...) {
va_list arg;
va_start(arg, fmt);
vfprintf(stderr, fmt, arg);
va_end(arg);
fprintf(stderr, "\n in %s", ctx->fn);
if(ctx->line)
fprintf(stderr, " line %d:%d", ctx->line+1, ctx->offset+1);
putc('\n', stderr);
while((ctx = ctx->parent))
fprintf(stderr, " included by %s line %d:%d\n", ctx->fn, ctx->line, ctx->offset);
exit(1);
}
/* Read a file descriptor to EOF. Buffer will be zero-terminated. */
static size_t slurp_fd(int fd, char **buf) {
size_t bufsize = 4096, buflen = 0;
ssize_t r;
*buf = malloc(bufsize);
while((r = read(fd, *buf+buflen, bufsize-buflen-1)) > 0) {
buflen += r;
if(bufsize-buflen < 4096) {
bufsize *= 2;
*buf = realloc(*buf, bufsize);
}
}
if(r < 0) {
free(*buf);
*buf = NULL;
return -1;
}
(*buf)[buflen] = 0;
return buflen;
}
static struct cfg_arg *cfg_arg_copy(struct cfg_arg *a) {
struct cfg_arg *head = NULL, **t = &head;
while(a) {
*t = malloc(sizeof(struct cfg_arg));
memcpy(*t, a, sizeof(struct cfg_arg));
(*t)->data = strdup(a->data);
t = &(*t)->next;
a = a->next;
}
return head;
}
static struct cfg_directive *cfg_directive_copy(struct cfg_directive *d) {
struct cfg_directive *head = NULL, **t = &head;
if(d == empty_body)
return d;
while(d) {
*t = malloc(sizeof(struct cfg_directive));
memcpy(*t, d, sizeof(struct cfg_directive));
(*t)->name = strdup(d->name);
(*t)->args = cfg_arg_copy(d->args);
(*t)->body = cfg_directive_copy(d->body);
t = &(*t)->next;
d = d->next;
}
return head;
}
/***********
* PARSING
*/
struct parse_ctx {
struct ctx *ctx;
size_t pos, len;
char *buf, c;
};
static char parse_take(struct parse_ctx *ctx) {
char c = ctx->c;
if(c == 0)
die(ctx->ctx, "Invalid 0 byte");
if(c == '\n') {
ctx->ctx->line++;
ctx->ctx->offset = 0;
} else
ctx->ctx->offset++;
ctx->pos++;
ctx->c = ctx->buf[ctx->pos];
return c;
}
// Consumes any number of whirespace characters and comments.
static void parse_ws(struct parse_ctx *ctx) {
while(1) {
switch(ctx->c) {
case ' ':
case '\t':
case '\r':
case '\n':
parse_take(ctx);
break;
case '#':
while(ctx->c != 0 && ctx->c != '\n')
parse_take(ctx);
break;
default:
return;
}
}
}
static void parse_unqarg(struct parse_ctx *ctx) {
while(1) {
switch(ctx->c) {
case '\\':
parse_take(ctx);
if(ctx->c == 0)
die(ctx->ctx, "Unexpected EOF");
break;
case '$': /* ${ should not be taken to start a block */
if(ctx->buf[ctx->pos+1] == '{')
parse_take(ctx);
break;
case 0:
case ' ':
case '\t':
case '\r':
case '\n':
case '{':
case ';':
return;
}
parse_take(ctx);
}
}
static void parse_qarg(struct parse_ctx *ctx) {
char c, q = parse_take(ctx);
while(1) {
if(ctx->c == 0)
die(ctx->ctx, "Unexpected EOF");
c = parse_take(ctx);
if(c == q)
return;
if(c == '\\') {
if(ctx->c == 0)
die(ctx->ctx, "Unexpected EOF");
parse_take(ctx);
}
}
}
// Parse either a quoted or unquoted string
static char *parse_arg(struct parse_ctx *ctx) {
size_t start = ctx->pos;
(ctx->c == '"' || ctx->c == '\'' ? parse_qarg : parse_unqarg)(ctx);
char *str = malloc(ctx->pos-start+1);
memcpy(str, ctx->buf+start, ctx->pos-start);
str[ctx->pos-start] = 0;
return str;
}
static struct cfg_directive *parse_block(struct parse_ctx *ctx) {
struct cfg_directive *head = NULL, *cur = NULL, *tmp;
struct cfg_arg **arg;
directive_start:
parse_ws(ctx);
if(ctx->c == 0 || ctx->c == '}')
return head ? head : empty_body;
tmp = calloc(1, sizeof(struct cfg_directive));
*(head ? &cur->next : &head) = tmp;
cur = tmp;
cur->name = parse_arg(ctx);
cur->ctx = *ctx->ctx;
arg = &cur->args;
directive_arg:
parse_ws(ctx);
switch(ctx->c) {
case 0:
die(ctx->ctx, "Unexpected EOF");
case ';':
parse_take(ctx);
goto directive_start;
case '{':
parse_take(ctx);
cur->body = parse_block(ctx);
if(ctx->c != '}')
die(ctx->ctx, "Unexpected EOF");
parse_take(ctx);
goto directive_start;
default:
*arg = calloc(1, sizeof(struct cfg_arg));
(*arg)->ctx = *ctx->ctx;
(*arg)->data = parse_arg(ctx);
arg = &(*arg)->next;
goto directive_arg;
}
return head; /* unreachable */
}
static struct cfg_directive *parse_file(struct ctx *ctx) {
size_t len;
char *buf;
int fd = strcmp(ctx->fn, "-") == 0 ? 0 : open(ctx->fn, 0);
if(fd < 0)
return NULL;
len = slurp_fd(fd, &buf);
if(len < 0)
return NULL;
close(fd);
struct parse_ctx pc = { ctx, 0, len, buf, *buf };
struct cfg_directive *ret = parse_block(&pc);
if(pc.c == '}')
die(pc.ctx, "Unexpected '}'");
free(buf);
return ret;
}
/**************
* FORMATTING
*/
static void write_str(FILE *f, const char *s) {
if(fputs(s, f) < 0) {
fprintf(stderr, "Error writing to output: %s", strerror(errno));
exit(1);
}
}
static void write_indent(FILE *f, int lvl) {
int i;
for(i=0; i<lvl; i++)
write_str(f, " ");
}
static void write_directive(FILE *f, int lvl, struct cfg_directive *d) {
struct cfg_arg *arg = d->args;
struct cfg_directive *body = d->body;
if(d == empty_body)
return;
write_indent(f, lvl);
write_str(f, d->name);
for(; arg; arg=arg->next) {
write_str(f, " ");
write_str(f, arg->data);
}
if(body) {
write_str(f, " {\n");
for(; body && body != empty_body; body=body->next)
write_directive(f, lvl+1, body);
write_indent(f, lvl);
write_str(f, "}\n");
} else
write_str(f, ";\n");
}
/**************
* PROCESSING
*/
struct proc_macro;
struct proc_data {
/* Array of macros */
size_t macrolen, macrosize;
struct proc_macro **macros;
/* Array of variables, each key/value pair is encoded as "key\0value\0"; values are already expanded and unquoted */
size_t varlen, varsize;
char **vars;
};
struct proc_macro {
char *name;
char **vars; /* Names of positional scalar arguments */
char *array; /* Name of the @array argument */
char *block; /* Name of the &block argument */
struct proc_data data[1]; /* Variables and macros that were available when this macro was defined */
struct cfg_directive *body;
};
struct proc_ctx {
struct proc_data data[1];
char **search_path;
/* When expanding a macro: */
struct proc_macro *macro;
struct cfg_arg *macro_array;
struct cfg_directive *macro_block;
};
/* Turns a quoted argument into an unquoted string. Returns a newly allocated string. */
static char *str_unquote(const char *str) {
char quote = *str == '\'' || *str == '"' ? *(str++) : 0;
char *ret = malloc(strlen(str)+1); /* Unquoted string will never be larger than the quoted version */
char *cur = ret;
while(*str != quote) {
if(*str == '\\')
str++;
*(cur++) = *(str++);
}
*cur = 0;
return ret;
}
/* Turns an unquoted string into a quoted argument using the given quoting style (", ' or 0). Returns a newly allocated string. Does not actually include the quotes. */
static char *str_quote(char quote, const char *strstart) {
const char *str = strstart;
char *ret = malloc(strlen(str)*2+1); /* Overly conservative, but w/e */
char *cur = ret;
while(*str) {
if(*str == quote || (quote == 0 &&
(*str == ' ' || *str == '\t' || *str == '\r' || *str == '\n' || *str == '\\' || *str == ';' || *str == '{' || (strstart == str && (*str == '"' || *str == '\'')))))
*(cur++) = '\\';
*(cur++) = *(str++);
}
*cur = 0;
return ret;
}
/* Returns the length of the variable name starting at str, or 0 if there's no valid variable name */
static size_t str_varname(const char *str) {
size_t len = 1;
if(!isAlpha(*str) && !isNum(*str))
return 0;
while(isAlpha(str[len]) || isNum(str[len]) || str[len] == '_')
len++;
return len;
}
/* Makes a shallow copy of a proc_data struct. Copies the arrays but not the values, as these can be re-used accross multiple contexts */
static struct proc_data proc_data_copy(struct proc_data d) {
struct proc_data r = d;
r.vars = malloc(sizeof(*r.vars)*r.varsize);
memcpy(r.vars, d.vars, sizeof(*r.vars)*r.varlen);
r.macros = malloc(sizeof(*r.macros)*r.macrosize);
memcpy(r.macros, d.macros, sizeof(*r.macros)*r.macrolen);
return r;
}
/* Lookup a variable in the current context, returns NULL if not found. */
static char *proc_var_get(struct proc_ctx *ctx, const char *varname, size_t varlen) {
size_t i;
if(varlen == 0)
return NULL;
for(i=0; i<ctx->data->varlen; i++)
if(strlen(ctx->data->vars[i]) == varlen && memcmp(ctx->data->vars[i], varname, varlen) == 0)
return ctx->data->vars[i]+varlen+1;
return NULL;
}
static void proc_var_set(struct proc_ctx *ctx, const char *name, const char *val) {
size_t i;
char *buf = malloc(strlen(name)+strlen(val)+2);
strcpy(buf, name);
strcpy(buf+strlen(name)+1, val);
for(i=0; i<ctx->data->varlen; i++)
if(strcmp(name, ctx->data->vars[i]) == 0) {
/* Do not free the old buffer here, it may still be referenced by macros */
ctx->data->vars[i] = buf;
return;
}
if(ctx->data->varlen == ctx->data->varsize) {
ctx->data->varsize *= 2;
ctx->data->vars = realloc(ctx->data->vars, ctx->data->varsize*sizeof(*ctx->data->vars));
}
ctx->data->vars[ctx->data->varlen++] = buf;
}
/* Delete $0..$9 variables */
static void proc_var_del_num(struct proc_ctx *ctx) {
size_t i = 0;
while(i < ctx->data->varlen)
if(isNum(*ctx->data->vars[i]) && !ctx->data->vars[i][1]) {
ctx->data->varlen--;
ctx->data->vars[i] = ctx->data->vars[ctx->data->varlen];
ctx->data->vars[ctx->data->varlen] = NULL;
} else
i++;
}
/* Substitute variables in a string. Returns a newly allocated string.
*
* Interpolated variables will be converted to the quoting style of the containing string.
* E.g.
* a = "abc{"; b = "x\yz"; c = "$something"
* $a -> abc\{
* $a$b; -> abc\{xyz
* "$a$b"; -> "abc{xyz"
* $c$a -> $somethingabc\{ <- Or should this be ${something}abc\{? Current solution is simpler, but not sure what the expected behavior is here.
*/
static char *proc_subst_vars(struct proc_ctx *ctx, const char *str) {
size_t len = 0, size = strlen(str)+1, varlen;
char *var, *cur, *ret = malloc(size);
char quote = *str == '\'' || *str == '"' ? *str : 0;
#define addc(c) do { if(len == size) { size *= 2; ret = realloc(ret, size); } ret[len++] = c; } while(0)
while(*str) {
if(*str == '\\') {
addc(*(str++));
addc(*(str++));
continue;
}
if(*str == '$') {
varlen = str_varname(str + 1 + (*(str+1) == '{'));
if((var = proc_var_get(ctx, str + 1 + (*(str+1) == '{'), varlen)) != NULL) {
cur = var = str_quote(quote, var);
while(*cur)
addc(*(cur++));
free(var);
str++;
if(*str == '{')
str++;
str += varlen;
if(*str == '}')
str++;
continue;
}
}
addc(*(str++));
}
addc(0);
#undef addc
return ret;
}
static void proc_args(struct proc_ctx *ctx, struct cfg_arg **arg) {
struct cfg_arg **a = arg, *next;
char *tmp;
while(*a) {
if(ctx->macro && ctx->macro->array && *(*a)->data == '@' && strcmp((*a)->data+1, ctx->macro->array) == 0) {
next = (*a)->next;
free((*a)->data);
free(*a);
if(ctx->macro_array) {
*a = cfg_arg_copy(ctx->macro_array);
while((*a)->next)
a = &(*a)->next;
(*a)->next = next;
a = &(*a)->next;
} else
*a = next;
} else {
tmp = proc_subst_vars(ctx, (*a)->data);
free((*a)->data);
(*a)->data = tmp;
a = &(*a)->next;
}
}
}
static void proc_block(struct proc_ctx *, struct cfg_directive **);
static void proc_include(struct proc_ctx *ctx, struct cfg_directive **block) {
struct ctx parser = {};
char *arg, **inc = ctx->search_path;
struct cfg_directive *c = *block, *new;
size_t l;
if(!c->args)
die(&c->ctx, "'pre_include' needs a filename argument");
if(c->args->next)
die(&c->ctx, "Too many arguments to 'pre_include'");
arg = str_unquote(proc_subst_vars(ctx, c->args->data));
if(strcmp(arg, "-") == 0)
die(&c->ctx, "Can't include files from standard input");
parser.parent = &c->ctx;
parser.fn = arg;
new = parse_file(&parser);
while(*arg != '/' && !new && inc && *inc) {
l = strlen(*inc) + strlen(arg) + 2;
parser.fn = malloc(l);
snprintf(parser.fn, l, "%s/%s", *inc, arg);
new = parse_file(&parser);
if(!new)
free(parser.fn);
inc++;
}
if(!new)
die(&c->ctx, "Unable to include file '%s': %s", arg, strerror(errno));
if(!new || new == empty_body)
*block = c->next;
else {
*block = new;
while(new && new->next)
new = new->next;
new->next = c->next;
}
}
static void proc_set(struct proc_ctx *ctx, struct cfg_directive *c) {
if(!c->args)
die(&c->ctx, "'pre_set' requires two arguments, but found none");
if(!c->args->next)
die(&c->ctx, "'pre_set' requires two arguments, but found only one");
if(c->args->next->next)
die(&c->ctx, "Too many arguments to 'pre_set'");
if(*c->args->data != '$' || str_varname(c->args->data+1) != strlen(c->args->data+1))
die(&c->args->ctx, "Invalid variable name '%s'", c->args->data);
proc_var_set(ctx, c->args->data+1, str_unquote(proc_subst_vars(ctx, c->args->next->data)));
}
static void proc_exec(struct proc_ctx *ctx, struct cfg_directive *c) {
char *buf, *argv[4];
size_t len;
posix_spawn_file_actions_t fact;
int status, fd[2];
pid_t pid;
if(!c->args)
die(&c->ctx, "'pre_exec' requires two arguments, but found none");
if(!c->args->next)
die(&c->ctx, "'pre_exec' requires two arguments, but found only one");
if(c->args->next->next)
die(&c->ctx, "Too many arguments to 'pre_exec'");
if(*c->args->data != '$' || str_varname(c->args->data+1) != strlen(c->args->data+1))
die(&c->args->ctx, "Invalid variable name '%s'", c->args->data);
argv[0] = "/bin/sh";
argv[1] = "-c";
argv[2] = str_unquote(proc_subst_vars(ctx, c->args->next->data));
argv[3] = NULL;
if(pipe(fd) < 0
|| posix_spawn_file_actions_init(&fact) < 0
|| posix_spawn_file_actions_addclose(&fact, fd[0]) < 0
|| posix_spawn_file_actions_adddup2(&fact, fd[1], 1) < 0
|| posix_spawn(&pid, "/bin/sh", &fact, NULL, argv, NULL) < 0
|| posix_spawn_file_actions_destroy(&fact) < 0)
die(&c->ctx, "Error spawning process: %s", strerror(errno));
close(fd[1]);
len = slurp_fd(fd[0], &buf);
if(len < 0)
die(&c->ctx, "Error reading data from process: %s", strerror(errno));
if(strlen(buf) != len)
die(&c->ctx, "Invalid 0-byte in process output");
close(fd[0]);
waitpid(pid, &status, 0);
if(WIFEXITED(status) && WEXITSTATUS(status) != 0)
die(&c->ctx, "Process exited with error status %d", WEXITSTATUS(status));
if(WIFSIGNALED(status))
die(&c->ctx, "Process was killed by signal %d", WTERMSIG(status));
if(len > 0 && buf[len-1] == '\n') /* Strip trailing newline */
buf[len-1] = 0;
proc_var_set(ctx, c->args->data+1, buf);
}
/* pre_if arguments are kind of annoying:
* Single arg: x ; (x) ; ( x ) ; (x ) ; ( x)
* Two args: x y ; (x y) ; ( x y ) ; (x y ) ; ( x y)
* Three args: x y z ; (x y z) ; ( x y z ) ; (x y z ) ; ( x y z)
*
* This function normalizes to the first variant. */
static void proc_if_parse_args(struct ctx *ctx, struct cfg_arg *arg, char **out) {
size_t i = 0;
int braces = 0;
out[0] = out[1] = out[2] = NULL;
if(arg && *arg->data == '(') {
braces = 1;
if(!arg->data[1])
arg = arg->next;
else
arg->data = arg->data+1;
}
while(arg) {
if(braces && !arg->next) {
if(arg->data[strlen(arg->data)-1] != ')')
die(ctx, "Missing )");
arg->data[strlen(arg->data)-1] = 0;
if(!*arg->data)
arg = arg->next;
if(!arg)
return;
}
if(i >= 3)
die(ctx, "Too many arguments to 'pre_if'");
out[i++] = arg->data;
arg = arg->next;
}
}
static int proc_if_infix(struct proc_ctx *ctx, struct ctx *if_ctx, char *a, char *op, char *b) {
regex_t reg;
regmatch_t match[9];
size_t i, len;
int r;
char *tmp, buf[1024];
if(strcmp(op, "==") == 0)
return strcmp(a, b) == 0;
if(strcmp(op, "!=") == 0)
return strcmp(a, b) != 0;
if(strcmp(op, "~") != 0 && strcmp(op, "~*") != 0 && strcmp(op, "!~") != 0 && strcmp(op, "!~*") != 0)
die(if_ctx, "Unknown comparison operator '%s'", op);
r = regcomp(®, b, REG_EXTENDED | (op[strlen(op)-1] == '*' ? REG_ICASE : 0));
if(r != 0) {
regerror(r, ®, buf, sizeof(buf));
die(if_ctx, "Invalid regular expression: %s", buf);
}
r = regexec(®, a, sizeof(match)/sizeof(*match), match, 0);
if(r != 0 && r != REG_NOMATCH) {
regerror(r, ®, buf, sizeof(buf));
die(if_ctx, "Error executing regular expression: %s", buf);
}
r = !r;
if(r)
proc_var_del_num(ctx);
for(i=0; r && match[i].rm_so != -1; i++) {
buf[0] = '0' + (char)i;
buf[1] = '\0';
len = match[i].rm_eo - match[i].rm_so;
tmp = malloc(len + 1);
memcpy(tmp, a+match[i].rm_so, len);
tmp[len] = 0;
proc_var_set(ctx, buf, tmp);
r = 2;
}
regfree(®);
return *op == '!' ? !r : r;
}
static int proc_if_cond(struct proc_ctx *ctx, struct ctx *if_ctx, char **arg) {
int negate = 0, r;
struct stat st;
char *a, *b;
/* Single argument: test if true/false */
if(!arg[1]) {
a = str_unquote(proc_subst_vars(ctx, arg[0]));
return *a && strcmp(a, "0") != 0;
}
/* Two arguments: file tests */
if(!arg[2]) {
a = arg[0];
b = str_unquote(proc_subst_vars(ctx, arg[1]));
if(*a == '!') {
a++;
negate = 1;
}
if(*a != '-' || !a[1] || a[2])
die(if_ctx, "Unknown argument to pre_if");
if(stat(b, &st) < 0) {
if(errno != ENOENT)
die(if_ctx, "Unable to fetch file information for '%s': %s\n", b, strerror(errno));
st.st_mode = 0;
}
switch(a[1]) {
case 'f': r = S_ISREG(st.st_mode); break;
case 'd': r = S_ISDIR(st.st_mode); break;
case 'e': r = st.st_mode != 0; break;
case 'x': r = st.st_mode & S_IXUSR || st.st_mode & S_IXGRP || st.st_mode & S_IXOTH; break; /* Maybe use access() instead? */
default: die(if_ctx, "Unknown file test flag '%s'", a);
}
return negate ? !r : r;
}
/* Three arguments: infix comparison operators */
a = str_unquote(proc_subst_vars(ctx, arg[0]));
b = str_unquote(proc_subst_vars(ctx, arg[2]));
return proc_if_infix(ctx, if_ctx, a, arg[1], b);
}
static void proc_if(struct proc_ctx *ctx, struct cfg_directive **cur) {
struct cfg_directive *tmp, *c = *cur;
char *arg[3];
int cond;
proc_if_parse_args(&c->ctx, c->args, arg);
if(!arg[0])
die(&c->ctx, "No condition provided to 'pre_if'");
if(!c->body)
die(&c->ctx, "No block argument provided to 'pre_if'");
cond = proc_if_cond(ctx, &c->ctx, arg);
if(cond && c->body != empty_body) {
proc_block(ctx, &c->body);
if(c->body != empty_body) {
tmp = *cur = c->body;
while(tmp->next)
tmp = tmp->next;
tmp->next = c->next;
}
} else
*cur = c->next;
/* If we've set any $0 vars, make sure to delete them again */
if(cond == 2)
proc_var_del_num(ctx);
}
static void proc_macro(struct proc_ctx *ctx, struct cfg_directive *c) {
struct proc_macro *m;
struct cfg_arg *a;
size_t i, varlen = 0, varsize = 0;
if(!c->args)
die(&c->ctx, "No macro name provided");
if(!c->body)
die(&c->ctx, "Macro definition without a body");
if(strlen(c->args->data) != str_varname(c->args->data))
die(&c->ctx, "Invalid macro name '%s'", c->args->data);
m = calloc(1, sizeof(struct proc_macro));
m->name = c->args->data;
*m->data = proc_data_copy(*ctx->data);
m->body = c->body;
for(a=c->args->next; a; a=a->next) {
if(!a->data[1] || strlen(a->data+1) != str_varname(a->data+1))
die(&a->ctx, "Invalid variable name '%s'", a->data);
if(*a->data == '$') {
if(m->array || m->block)
die(&a->ctx, "Invalid $scalar macro argument after @array or &block");
if(varsize == varlen) {
varsize = varsize ? varsize*2 : 8;
m->vars = realloc(m->vars, sizeof(*m->vars)*(varsize+1));
}
m->vars[varlen++] = a->data+1;
m->vars[varlen] = NULL;
} else if(*a->data == '@') {
if(m->array || m->block)
die(&a->ctx, "Invalid @array macro argument after @array or &block");
m->array = a->data+1;
} else if(*a->data == '&') {
if(m->block)
die(&a->ctx, "Invalid duplicate &block macro argument");
m->block = a->data+1;
} else
die(&a->ctx, "Invalid variable argument '%s'", a->data);
}
for(i=0; i<ctx->data->macrolen; i++)
if(strcmp(ctx->data->macros[i]->name, m->name) == 0) {
ctx->data->macros[i] = m;
return;
}
if(ctx->data->macrolen == ctx->data->macrosize) {
ctx->data->macrosize *= 2;
ctx->data->macros = realloc(ctx->data->macros, sizeof(*ctx->data->macros)*ctx->data->macrosize);
}
ctx->data->macros[ctx->data->macrolen++] = m;
}
static struct cfg_directive **proc_directive(struct proc_ctx *ctx, struct cfg_directive **cur) {
size_t i;
struct proc_macro *m, *old_macro;
struct proc_data old_data;
struct cfg_arg *old_array;
struct cfg_directive *old_block, *c = *cur;
proc_args(ctx, &c->args);
if(c->body)
proc_block(ctx, &c->body);
for(i=0; i<ctx->data->macrolen; i++)
if(strcmp(ctx->data->macros[i]->name, c->name) == 0)
break;
if(i == ctx->data->macrolen)
return &c->next;
m = ctx->data->macros[i];
old_data = proc_data_copy(*ctx->data);
old_macro = ctx->macro;
old_array = ctx->macro_array;
old_block = ctx->macro_block;
free(ctx->data->vars);
free(ctx->data->macros);
*ctx->data = proc_data_copy(*m->data);
if(m->block && !c->body)
die(&c->ctx, "Macro '%s' requires a block argument, none given", m->name);
if(!m->block && c->body)
die(&c->ctx, "Macro '%s' does not accept a block argument", m->name);
for(i=0; m->vars && m->vars[i]; i++) {
if(!c->args)
die(&c->ctx, "Not enough arguments given to macro '%s'", m->name);
proc_var_set(ctx, m->vars[i], str_unquote(c->args->data));
c->args = c->args->next;
}
if(c->args && !m->array)
die(&c->ctx, "Too many arguments given to macro '%s'", m->name);
ctx->macro = m;
ctx->macro_array = c->args;
ctx->macro_block = c->body;
/* TODO: Errors reported in the macro expansion will be given with the
* context of the macro itself, but it would be nice to include the context
* of the line that invoked the macro. */
*cur = cfg_directive_copy(m->body);
proc_block(ctx, cur);
if(*cur == empty_body)
*cur = c->next;
else {
while((*cur)->next)
cur = &(*cur)->next;
(*cur)->next = c->next;
cur = &(*cur)->next;
}
free(ctx->data->vars);
free(ctx->data->macros);
*ctx->data = old_data;
ctx->macro = old_macro;
ctx->macro_array = old_array;
ctx->macro_block = old_block;
return cur;
}
static void proc_block(struct proc_ctx *ctx, struct cfg_directive **block) {
struct cfg_directive **cur = block, *c = *block;
struct cfg_arg *arg;
while(*cur && *cur != empty_body) {
c = *cur;
if(strcmp(c->name, "pre_warn") == 0) {
proc_args(ctx, &c->args);
fputs("[warn]", stderr);
for(arg=c->args; arg; arg=arg->next) {
fputc(' ', stderr);
fputs(str_unquote(arg->data), stderr);
};
fputc('\n', stderr);
*cur = c->next;
} else if(strcmp(c->name, "pre_include") == 0) {
proc_include(ctx, cur);
} else if(strcmp(c->name, "pre_set") == 0) {
proc_set(ctx, *cur);
*cur = c->next;
} else if(strcmp(c->name, "pre_exec") == 0) {
proc_exec(ctx, *cur);
*cur = c->next;
} else if(strcmp(c->name, "pre_if") == 0) {
proc_if(ctx, cur);
} else if(strcmp(c->name, "macro") == 0) {
proc_macro(ctx, *cur);
*cur = c->next;
} else if(ctx->macro && ctx->macro->block && *c->name == '&' && strcmp(c->name+1, ctx->macro->block) == 0) {
if(c->args)
die(&c->ctx, "&block variable should not be given any arguments");
if(c->body)
die(&c->ctx, "Unexpected block after &block variable");
if(ctx->macro_block && ctx->macro_block != empty_body) {
*cur = cfg_directive_copy(ctx->macro_block);
while((*cur)->next)
cur = &(*cur)->next;
(*cur)->next = c->next;
cur = &(*cur)->next;
} else
*cur = c->next;
} else
cur = proc_directive(ctx, cur);
}
if(!*block)
*block = empty_body;
}
int main(int argc, char **argv) {
struct cfg_directive *d;
struct ctx toplevel = { "-", 0, 0, NULL };
struct proc_ctx proc = {};
char *output = "-";
FILE *out_fh;
int c;
size_t searchlen = 0, searchsize = 0;
static const struct option long_options[] = {
{"help", no_argument, 0, 'h' },
{"version", no_argument, 0, 'V' },
{0, 0, 0, 0 }
};
while((c = getopt_long(argc, argv, "hVi:o:I:", long_options, NULL)) >= 0) {
switch(c) {
case 'h':
puts("Usage: nginx-confgen <options>\n");
puts(" -h,--help This help message");
puts(" -V,--version Print version");
puts(" -i <FILE> Read input from file, \"-\" for standard input");
puts(" -o <FILE> Write output to file, \"-\" for standard output");
puts(" -I <DIR> Add directory to the search path for 'pre_include'");
exit(0);
case 'V':
printf("nginx-confgen %s\n", NGCFG_VERSION);
exit(0);
case 'i':
toplevel.fn = optarg;
break;
case 'o':
output = optarg;
break;
case 'I':
if(searchlen == searchsize) {
searchsize = searchsize ? searchsize*2 : 8;
proc.search_path = realloc(proc.search_path, sizeof(*proc.search_path)*(1+searchsize));
}
proc.search_path[searchlen++] = optarg;
proc.search_path[searchlen] = NULL;
break;
case '?':
exit(1);
}
}
if(optind < argc) {
fprintf(stderr, "Unrecognized option: %s\n", argv[optind]);
exit(1);
}
d = parse_file(&toplevel);
if(!d)
die(&toplevel, "Error reading input: %s", strerror(errno));
proc.data->varsize = 32;
proc.data->vars = malloc(proc.data->varsize*sizeof(*proc.data->vars));
proc.data->macrosize = 32;
proc.data->macros = malloc(proc.data->macrosize*sizeof(*proc.data->macros));
proc_block(&proc, &d);
if(strcmp(output, "-") == 0)
out_fh = stdout;
else if((out_fh = fopen(output, "w")) == NULL) {
fprintf(stderr, "Error writing to '%s': %s\n", output, strerror(errno));
exit(1);
}
for(; d; d=d->next)
write_directive(out_fh, 0, d);
return 0;
}
|