Commit | Line | Data |
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2fe58dfd SE |
1 | /* |
2 | * $Log$ | |
3 | */ | |
4 | ||
5 | /* conffile.c - process the configuration file */ | |
6 | ||
7 | /* #define DUMP_PARSE_TREE */ | |
8 | ||
8689b3a9 | 9 | #include "secnet.h" |
2fe58dfd | 10 | #include <stdio.h> |
2fe58dfd | 11 | #include <string.h> |
2fe58dfd SE |
12 | #include "conffile.h" |
13 | #include "conffile_internal.h" | |
14 | #include "util.h" | |
7138d0c5 SE |
15 | #include "ipaddr.h" |
16 | ||
17 | /* from modules.c */ | |
18 | extern void init_builtin_modules(dict_t *dict); | |
2fe58dfd SE |
19 | |
20 | static struct cloc no_loc={"none",0}; | |
21 | ||
22 | struct atomlist { | |
23 | struct atomlist *next; | |
24 | atom_t a; | |
25 | }; | |
26 | ||
27 | struct entry { | |
28 | struct entry *next; | |
29 | atom_t key; | |
30 | list_t *val; | |
31 | }; | |
32 | ||
33 | struct searchlist { | |
34 | struct dict *d; | |
35 | struct searchlist *next; | |
36 | }; | |
37 | ||
38 | struct dict { | |
39 | struct dict *parent; | |
40 | struct searchlist *search; | |
41 | struct entry *entries; | |
42 | uint32_t size; | |
43 | }; | |
44 | ||
45 | static struct atomlist *atoms=NULL; | |
46 | ||
47 | static void process_alist(dict_t *context, struct p_node *c); | |
48 | static list_t *process_invocation(dict_t *context, struct p_node *i); | |
49 | ||
50 | static list_t *dict_ilookup_primitive(dict_t *dict, atom_t key) | |
51 | { | |
52 | struct entry *i; | |
53 | for (i=dict->entries; i; i=i->next) { | |
54 | if (key==i->key) return i->val; | |
55 | } | |
56 | return NULL; | |
57 | } | |
58 | ||
59 | static list_t *dict_ilookup(dict_t *dict, atom_t key) | |
60 | { | |
61 | dict_t *d; | |
62 | list_t *v; | |
63 | ||
64 | v=dict_ilookup_primitive(dict, key); | |
65 | if (v) return v; | |
66 | /* Check dictionaries in search path */ | |
67 | /* XXX */ | |
68 | /* Check lexical parents */ | |
69 | for (d=dict; d; d=d->parent) { | |
70 | v=dict_ilookup_primitive(d, key); | |
71 | if (v) return v; | |
72 | } | |
73 | return NULL; | |
74 | } | |
75 | ||
76 | static void dict_iadd(dict_t *dict, atom_t key, list_t *val) | |
77 | { | |
78 | struct entry *e; | |
79 | /* XXX May want to permit redefinition of keys in the future */ | |
80 | /* (although it could be very confusing) */ | |
81 | if (dict_ilookup_primitive(dict, key)) { | |
82 | fatal("duplicate key \"%s\" in dictionary\n",key); | |
83 | } | |
84 | e=safe_malloc(sizeof(*e),"dict_add"); | |
85 | e->next=dict->entries; | |
86 | e->key=key; | |
87 | e->val=val; | |
88 | dict->entries=e; | |
89 | dict->size++; | |
90 | } | |
91 | ||
92 | /***** Functions beyond this point are private to the config system *****/ | |
93 | ||
94 | static dict_t *dict_new(dict_t *parent) | |
95 | { | |
96 | dict_t *d; | |
97 | ||
98 | d=safe_malloc(sizeof(*d),"dict_new"); | |
99 | d->parent=parent; | |
100 | d->search=NULL; | |
101 | d->entries=NULL; | |
102 | d->size=0; | |
103 | return d; | |
104 | } | |
105 | ||
106 | static struct p_node *node_copy(struct p_node *n) | |
107 | { | |
108 | struct p_node *r; | |
109 | r=safe_malloc(sizeof(*r),"node_copy"); | |
110 | *r=*n; | |
111 | return r; | |
112 | } | |
113 | ||
114 | static struct p_node *list_reverse(struct p_node *list) | |
115 | { | |
116 | struct p_node *rl=NULL, *i, *n; | |
117 | ||
118 | for (i=list; i; i=i->r) { | |
119 | n=node_copy(i); | |
120 | n->r=rl; | |
121 | rl=n; | |
122 | } | |
123 | return rl; | |
124 | } | |
125 | ||
126 | /* Since we use left-recursion in the parser for efficiency, sequences | |
127 | end up "backwards" in the parse tree. Rather than have complicated | |
128 | code for, eg. processing assignments in the right order, we reverse | |
129 | these sequences here. */ | |
130 | static void ptree_mangle(struct p_node *t) | |
131 | { | |
132 | if (!t) return; | |
133 | ptree_mangle(t->l); | |
134 | ptree_mangle(t->r); | |
135 | switch (t->type) { | |
136 | case T_DICT: | |
137 | /* ASSERT !t->l || t->l->type==T_ALIST */ | |
138 | /* ASSERT !t->r || t->r->type==T_LISTITEM */ | |
139 | t->l=list_reverse(t->l); | |
140 | t->r=list_reverse(t->r); | |
141 | break; | |
142 | case T_ASSIGNMENT: | |
143 | /* ASSERT t->l->type==T_KEY */ | |
144 | /* ASSERT t->r->type==T_LISTITEM */ | |
145 | t->r=list_reverse(t->r); | |
146 | break; | |
147 | case T_ABSPATH: | |
148 | case T_RELPATH: | |
149 | /* ASSERT t->l==NULL */ | |
150 | /* ASSERT t->r->type==T_PATHELEM */ | |
151 | t->r=list_reverse(t->r); | |
152 | break; | |
153 | case T_EXEC: | |
154 | /* ASSERT t->l */ | |
155 | /* ASSERT t->r->type==T_LISTITEM */ | |
156 | t->r=list_reverse(t->r); | |
157 | break; | |
158 | } | |
159 | } | |
160 | ||
161 | #ifdef DUMP_PARSE_TREE | |
162 | /* Convert a node type to a string, for parse tree dump */ | |
163 | static string_t ntype(uint32_t type) | |
164 | { | |
165 | switch(type) { | |
166 | case T_STRING: return "T_STRING"; | |
167 | case T_NUMBER: return "T_NUMBER"; | |
168 | case T_KEY: return "T_KEY"; | |
169 | case T_ASSIGNMENT: return "T_ASSIGNMENT"; | |
170 | case T_LISTITEM: return "T_LISTITEM"; | |
171 | case T_EXEC: return "T_EXEC"; | |
172 | case T_PATHELEM: return "T_PATHELEM"; | |
173 | case T_ABSPATH: return "T_ABSPATH"; | |
174 | case T_RELPATH: return "T_RELPATH"; | |
175 | case T_DICT: return "T_DICT"; | |
176 | case T_ALIST: return "T_ALIST"; | |
177 | case T_ERROR: return "T_ERROR"; | |
178 | } | |
179 | return "**unknown**"; | |
180 | } | |
181 | ||
182 | static void ptree_indent(uint32_t amount) | |
183 | { | |
184 | uint32_t i; | |
185 | for (i=0; i<amount; i++) printf(" . "); | |
186 | } | |
187 | ||
188 | static void ptree_dump(struct p_node *n, uint32_t d) | |
189 | { | |
190 | if (!n) { | |
191 | printf("NULL\n"); | |
192 | return; | |
193 | } | |
194 | ||
195 | if (n->type<10) { | |
196 | switch(n->type) { | |
197 | case T_STRING: printf("T_STRING: \"%s\" (%s line %d)\n", | |
198 | n->data.string,n->loc.file,n->loc.line); break; | |
199 | case T_NUMBER: printf("T_NUMBER: %d (%s line %d)\n", | |
200 | n->data.number, n->loc.file,n->loc.line); break; | |
201 | case T_KEY: printf("T_KEY: %s (%s line %d)\n", | |
202 | n->data.key, n->loc.file,n->loc.line); break; | |
203 | default: printf("**unknown primitive type**\n"); break; | |
204 | } | |
205 | } else { | |
206 | printf("%s: (%s line %d)\n",ntype(n->type),n->loc.file,n->loc.line); | |
207 | ptree_indent(d); | |
208 | printf(" |-"); ptree_dump(n->l, d+1); | |
209 | ptree_indent(d); | |
210 | printf(" +-"); ptree_dump(n->r, d+1); | |
211 | } | |
212 | } | |
213 | ||
214 | #endif /* DUMP_PARSE_TREE */ | |
215 | ||
216 | static dict_t *dict_find_root(dict_t *d) | |
217 | { | |
218 | dict_t *i; | |
219 | ||
220 | for (i=d; i->parent; i=i->parent); | |
221 | return i; | |
222 | } | |
223 | ||
224 | static list_t *dict_lookup_path(dict_t *context, struct p_node *p) | |
225 | { | |
226 | dict_t *i; | |
227 | list_t *l; | |
228 | ||
229 | /* ASSERT p->type==T_PATHELEM */ | |
230 | /* ASSERT p->l->type==T_KEY */ | |
231 | l=dict_ilookup(context, p->l->data.key); | |
232 | if (!l) { | |
233 | cfgfatal(p->loc,"conffile","can't find key %s\n", | |
234 | p->l->data.key); | |
235 | } | |
236 | ||
237 | while (p->r) { | |
238 | if (l->item->type != t_dict) { | |
239 | cfgfatal(p->loc,"conffile","path element \"%s\" " | |
240 | "is not a dictionary\n",p->l->data.key); | |
241 | } | |
242 | i=l->item->data.dict; /* First thing in list */ | |
243 | ||
244 | p=p->r; | |
245 | l=dict_ilookup_primitive(i, p->l->data.key); | |
246 | if (!l) { | |
247 | cfgfatal(p->loc,"conffile","can't find key %s\n", | |
248 | p->l->data.key); | |
249 | } | |
250 | } | |
251 | return l; | |
252 | } | |
253 | ||
254 | static item_t *new_item(enum types type, struct cloc loc) | |
255 | { | |
256 | item_t *i; | |
257 | ||
258 | i=safe_malloc(sizeof(*i),"new_item"); | |
259 | i->type=type; | |
260 | i->loc=loc; | |
261 | return i; | |
262 | } | |
263 | ||
264 | static list_t *process_item(dict_t *context, struct p_node *i) | |
265 | { | |
266 | item_t *item=NULL; | |
267 | ||
268 | switch (i->type) { | |
269 | case T_STRING: | |
270 | item=new_item(t_string, i->loc); | |
271 | item->data.string=i->data.string; /* XXX maybe strcpy */ | |
272 | break; | |
273 | case T_NUMBER: | |
274 | item=new_item(t_number, i->loc); | |
275 | item->data.number=i->data.number; | |
276 | break; | |
277 | case T_ABSPATH: | |
278 | context=dict_find_root(context); | |
279 | /* falls through */ | |
280 | case T_RELPATH: | |
281 | return dict_lookup_path(context, i->r); | |
282 | /* returns immediately */ | |
283 | break; | |
284 | case T_DICT: | |
285 | item=new_item(t_dict, i->loc); | |
286 | item->data.dict=dict_new(context); | |
287 | /* XXX dict_add_searchpath(context,process_ilist(context, i->r)); */ | |
288 | process_alist(item->data.dict, i->l); | |
289 | break; | |
290 | case T_EXEC: | |
291 | return process_invocation(context, i); | |
292 | /* returns immediately */ | |
293 | break; | |
294 | default: | |
295 | #ifdef DUMP_PARSE_TREE | |
296 | ptree_dump(i,0); | |
297 | fatal("process_item: invalid node type for a list item (%s)\n", | |
298 | ntype(i->type)); | |
299 | #else | |
300 | fatal("process_item: list item has invalid node type %d - recompile " | |
301 | "with DUMP_PARSE_TREE defined in conffile.c for more " | |
302 | "detailed debug output",i->type); | |
303 | #endif /* DUMP_PARSE_TREE */ | |
304 | break; | |
305 | } | |
306 | return list_append(NULL,item); | |
307 | } | |
308 | ||
309 | static list_t *process_ilist(dict_t *context, struct p_node *l) | |
310 | { | |
311 | struct p_node *i; | |
312 | list_t *r; | |
313 | ||
314 | /* ASSERT l->type==T_LISTITEM */ | |
315 | ||
316 | r=list_new(); | |
317 | ||
318 | for (i=l; i; i=i->r) { | |
319 | r=list_append_list(r,process_item(context,i->l)); | |
320 | } | |
321 | return r; | |
322 | } | |
323 | ||
324 | static list_t *process_invocation(dict_t *context, struct p_node *i) | |
325 | { | |
326 | list_t *cll; | |
327 | item_t *cl; | |
328 | list_t *args; | |
329 | ||
330 | /* ASSERT i->type==T_EXEC */ | |
331 | /* ASSERT i->r->type==T_LISTITEM */ | |
332 | /* XXX it might be null too */ | |
333 | cll=process_item(context,i->l); | |
334 | cl=cll->item; | |
335 | if (cl->type != t_closure) { | |
336 | cfgfatal(i->l->loc,"conffile","only closures can be invoked\n"); | |
337 | } | |
338 | args=process_ilist(context, i->r); | |
339 | return cl->data.closure->apply(cl->data.closure, i->loc, context, args); | |
340 | } | |
341 | ||
342 | static void process_alist(dict_t *context, struct p_node *c) | |
343 | { | |
344 | struct p_node *i; | |
345 | atom_t k; | |
346 | list_t *l; | |
347 | ||
348 | if (!c) return; /* NULL assignment lists are valid (empty dictionary) */ | |
349 | ||
350 | /* ASSERT c->type==T_ALIST */ | |
351 | if (c->type!=T_ALIST) { | |
352 | fatal("invalid node type in assignment list\n"); | |
353 | } | |
354 | ||
355 | for (i=c; i; i=i->r) { | |
356 | /* ASSERT i->l && i->l->type==T_ASSIGNMENT */ | |
357 | /* ASSERT i->l->l->type==T_KEY */ | |
358 | /* ASSERT i->l->r->type==T_LISTITEM */ | |
359 | k=i->l->l->data.key; | |
360 | l=process_ilist(context, i->l->r); | |
361 | dict_iadd(context, k, l); | |
362 | } | |
363 | } | |
364 | ||
365 | /* Take a list of items; turn any dictionaries in this list into lists */ | |
366 | static list_t *makelist(closure_t *self, struct cloc loc, | |
367 | dict_t *context, list_t *args) | |
368 | { | |
369 | list_t *r=NULL, *i; | |
370 | struct entry *e; | |
371 | ||
372 | for (i=args; i; i=i->next) { | |
373 | if (i->item->type==t_dict) { | |
374 | /* Convert */ | |
375 | for (e=i->item->data.dict->entries; e; e=e->next) { | |
376 | r=list_append_list(r, e->val); | |
377 | } | |
378 | } else { | |
379 | r=list_append_list(r, list_append(NULL,i->item)); | |
380 | } | |
381 | } | |
382 | return r; | |
383 | } | |
384 | ||
9d3a4132 SE |
385 | /* Take a list consisting of a closure and some other things. Apply the |
386 | closure to the other things, and return the resulting list */ | |
387 | static list_t *map(closure_t *self, struct cloc loc, dict_t *context, | |
388 | list_t *args) | |
389 | { | |
390 | list_t *r=NULL, *al; | |
391 | item_t *ci; | |
392 | closure_t *cl; | |
393 | list_t se; | |
394 | ||
395 | ci=list_elem(args,0); | |
396 | if (ci && ci->type==t_closure) { | |
397 | cl=ci->data.closure; | |
398 | if (!cl->apply) { | |
399 | cfgfatal(loc,"map","closure cannot be applied\n"); | |
400 | } | |
401 | for (al=args->next; al; al=al->next) { | |
402 | /* Construct a single-element list */ | |
403 | se.next=NULL; | |
404 | se.item=al->item; | |
405 | /* Invoke the closure, append its result to the output */ | |
406 | r=list_append_list(r,cl->apply(cl,loc,context,&se)); | |
407 | } | |
408 | } else { | |
409 | cfgfatal(loc,"map","you must supply a closure as the " | |
410 | "first argument\n"); | |
411 | } | |
412 | return r; | |
413 | } | |
414 | ||
2fe58dfd SE |
415 | /* Read a file and turn it into a string */ |
416 | static list_t *readfile(closure_t *self, struct cloc loc, | |
417 | dict_t *context, list_t *args) | |
418 | { | |
419 | FILE *f; | |
420 | string_t filename; | |
421 | long length; | |
422 | item_t *r; | |
423 | ||
424 | r=list_elem(args,0); | |
425 | if (!r) { | |
426 | cfgfatal(loc,"readfile","you must supply a filename\n"); | |
427 | } | |
428 | if (r->type!=t_string) { | |
429 | cfgfatal(loc,"readfile","filename must be a string\n"); | |
430 | } | |
431 | filename=r->data.string; | |
432 | f=fopen(filename,"rb"); | |
433 | if (!f) { | |
434 | fatal_perror("readfile (%s:%d): cannot open file \"%s\"", | |
435 | loc.file,loc.line, filename); | |
436 | } | |
437 | if (fseek(f, 0, SEEK_END)!=0) { | |
438 | fatal_perror("readfile (%s:%d): fseek(SEEK_END)",loc.file,loc.line); | |
439 | } | |
440 | length=ftell(f); | |
441 | if (length<0) { | |
442 | fatal_perror("readfile (%s:%d): ftell()",loc.file,loc.line); | |
443 | } | |
444 | if (fseek(f, 0, SEEK_SET)!=0) { | |
445 | fatal_perror("readfile (%s:%d): fseek(SEEK_SET)",loc.file,loc.line); | |
446 | } | |
447 | r=new_item(t_string,loc); | |
448 | r->data.string=safe_malloc(length+1,"readfile"); | |
449 | if (fread(r->data.string,length,1,f)!=1) { | |
450 | fatal("readfile (%s:%d): fread: could not read all of file\n", | |
451 | loc.file,loc.line); | |
452 | } | |
453 | r->data.string[length]=0; | |
454 | if (fclose(f)!=0) { | |
455 | fatal_perror("readfile (%s:%d): fclose",loc.file,loc.line); | |
456 | } | |
457 | return list_append(NULL,r); | |
458 | } | |
459 | ||
460 | static dict_t *process_config(struct p_node *c) | |
461 | { | |
462 | dict_t *root; | |
463 | dict_t *context; | |
464 | item_t *i; | |
465 | list_t *false; | |
466 | list_t *true; | |
467 | ||
468 | root=dict_new(NULL); | |
469 | context=root; | |
470 | ||
471 | /* Predefined keys for boolean values */ | |
472 | i=new_item(t_bool,no_loc); | |
473 | i->data.bool=False; | |
474 | false=list_append(NULL,i); | |
475 | i=new_item(t_bool,no_loc); | |
476 | i->data.bool=True; | |
477 | true=list_append(NULL,i); | |
478 | dict_add(root,"false",false); | |
479 | dict_add(root,"False",false); | |
480 | dict_add(root,"FALSE",false); | |
481 | dict_add(root,"no",false); | |
482 | dict_add(root,"No",false); | |
483 | dict_add(root,"NO",false); | |
484 | dict_add(root,"true",true); | |
485 | dict_add(root,"True",true); | |
486 | dict_add(root,"TRUE",true); | |
487 | dict_add(root,"yes",true); | |
488 | dict_add(root,"Yes",true); | |
489 | dict_add(root,"YES",true); | |
490 | ||
491 | add_closure(root,"makelist",makelist); | |
492 | add_closure(root,"readfile",readfile); | |
9d3a4132 | 493 | add_closure(root,"map",map); |
2fe58dfd SE |
494 | |
495 | init_builtin_modules(root); | |
496 | ||
497 | process_alist(context, c); | |
498 | ||
499 | return root; | |
500 | } | |
501 | ||
502 | /***** Externally accessible functions */ | |
503 | ||
504 | atom_t intern(string_t s) | |
505 | { | |
506 | struct atomlist *i; | |
507 | ||
508 | for (i=atoms; i; i=i->next) { | |
509 | if (strcmp(i->a, s)==0) break; | |
510 | } | |
511 | ||
512 | if (!i) { | |
513 | /* Did't find it; create a new one */ | |
514 | i=safe_malloc(sizeof(*i),"intern: alloc list entry"); | |
515 | i->a=safe_strdup(s,"intern: alloc string"); | |
516 | i->next=atoms; | |
517 | atoms=i; | |
518 | } | |
519 | return i->a; | |
520 | } | |
521 | ||
522 | list_t *dict_lookup(dict_t *dict, string_t key) | |
523 | { | |
524 | return dict_ilookup(dict, intern(key)); | |
525 | } | |
526 | ||
527 | list_t *dict_lookup_primitive(dict_t *dict, string_t key) | |
528 | { | |
529 | return dict_ilookup_primitive(dict, intern(key)); | |
530 | } | |
531 | ||
532 | void dict_add(dict_t *dict, string_t key, list_t *val) | |
533 | { | |
534 | dict_iadd(dict,intern(key),val); | |
535 | } | |
536 | ||
537 | string_t *dict_keys(dict_t *dict) | |
538 | { | |
539 | atom_t *r, *j; | |
540 | struct entry *i; | |
541 | r=safe_malloc(sizeof(*r)*(dict->size+1),"dict_keys"); | |
542 | for (i=dict->entries, j=r; i; i=i->next, j++) { | |
543 | *j=i->key; | |
544 | } | |
545 | *j=NULL; | |
546 | return r; | |
547 | } | |
548 | ||
549 | ||
550 | /* List-related functions */ | |
551 | ||
552 | list_t *list_new(void) | |
553 | { | |
554 | return NULL; | |
555 | } | |
556 | ||
b2a56f7c SE |
557 | uint32_t list_length(list_t *a) |
558 | { | |
559 | uint32_t l=0; | |
560 | list_t *i; | |
561 | for (i=a; i; i=i->next) l++; | |
562 | return l; | |
563 | } | |
564 | ||
3454dce4 SE |
565 | list_t *list_copy(list_t *a) |
566 | { | |
567 | list_t *r, *i, *b, *l; | |
568 | ||
569 | if (!a) return NULL; | |
570 | l=NULL; | |
571 | r=NULL; | |
572 | for (i=a; i; i=i->next) { | |
573 | b=safe_malloc(sizeof(*b),"list_copy"); | |
574 | if (l) l->next=b; else r=b; | |
575 | l=b; | |
576 | b->item=i->item; | |
577 | b->next=NULL; | |
578 | } | |
579 | return r; | |
580 | } | |
581 | ||
2fe58dfd SE |
582 | list_t *list_append_list(list_t *a, list_t *b) |
583 | { | |
584 | list_t *i; | |
585 | ||
3454dce4 | 586 | b=list_copy(b); |
2fe58dfd SE |
587 | if (!a) return b; |
588 | for (i=a; i->next; i=i->next); | |
589 | i->next=b; | |
590 | return a; | |
591 | } | |
592 | ||
593 | list_t *list_append(list_t *list, item_t *item) | |
594 | { | |
595 | list_t *l; | |
596 | ||
597 | l=safe_malloc(sizeof(*l),"list_append"); | |
598 | l->item=item; | |
599 | l->next=NULL; | |
600 | ||
601 | return list_append_list(list,l); | |
602 | } | |
603 | ||
604 | item_t *list_elem(list_t *l, uint32_t index) | |
605 | { | |
606 | if (!l) return NULL; | |
607 | if (index==0) return l->item; | |
608 | return list_elem(l->next, index-1); | |
609 | } | |
610 | ||
611 | list_t *new_closure(closure_t *cl) | |
612 | { | |
613 | item_t *i; | |
614 | ||
615 | i=new_item(t_closure,no_loc); | |
616 | i->data.closure=cl; | |
617 | return list_append(NULL,i); | |
618 | } | |
619 | ||
620 | void add_closure(dict_t *dict, string_t name, apply_fn apply) | |
621 | { | |
622 | closure_t *c; | |
623 | c=safe_malloc(sizeof(*c),"add_closure"); | |
624 | c->description=name; | |
625 | c->apply=apply; | |
626 | c->interface=NULL; | |
627 | ||
628 | dict_add(dict,name,new_closure(c)); | |
629 | } | |
630 | ||
631 | void *find_cl_if(dict_t *dict, string_t name, uint32_t type, | |
632 | bool_t fail_if_invalid, string_t desc, struct cloc loc) | |
633 | { | |
634 | list_t *l; | |
635 | item_t *i; | |
636 | closure_t *cl; | |
637 | ||
638 | l=dict_lookup(dict,name); | |
639 | if (!l) { | |
640 | if (!fail_if_invalid) return NULL; | |
641 | cfgfatal(loc,desc,"closure \"%s\" not found\n",name); | |
642 | } | |
643 | i=list_elem(l,0); | |
644 | if (i->type!=t_closure) { | |
645 | if (!fail_if_invalid) return NULL; | |
646 | cfgfatal(loc,desc,"\"%s\" must be a closure\n",name); | |
647 | } | |
648 | cl=i->data.closure; | |
649 | if (cl->type!=type) { | |
650 | if (!fail_if_invalid) return NULL; | |
651 | cfgfatal(loc,desc,"\"%s\" is the wrong type of closure\n",name); | |
652 | } | |
653 | return cl->interface; | |
654 | } | |
655 | ||
656 | /* Convenience functions for modules reading configuration dictionaries */ | |
657 | item_t *dict_find_item(dict_t *dict, string_t key, bool_t required, | |
658 | string_t desc, struct cloc loc) | |
659 | { | |
660 | list_t *l; | |
661 | item_t *i; | |
662 | ||
663 | l=dict_lookup(dict,key); | |
664 | if (!l) { | |
665 | if (!required) return NULL; | |
666 | cfgfatal(loc,desc,"required parameter \"%s\" not found\n",key); | |
667 | } | |
668 | i=list_elem(l,0); | |
669 | return i; | |
670 | } | |
671 | ||
672 | string_t dict_read_string(dict_t *dict, string_t key, bool_t required, | |
673 | string_t desc, struct cloc loc) | |
674 | { | |
675 | item_t *i; | |
676 | string_t r; | |
677 | ||
678 | i=dict_find_item(dict,key,required,desc,loc); | |
679 | if (!i) return NULL; | |
680 | if (i->type!=t_string) { | |
681 | cfgfatal(loc,desc,"\"%s\" must be a string\n",key); | |
682 | } | |
683 | r=i->data.string; | |
684 | return r; | |
685 | } | |
686 | ||
687 | uint32_t dict_read_number(dict_t *dict, string_t key, bool_t required, | |
688 | string_t desc, struct cloc loc, uint32_t def) | |
689 | { | |
690 | item_t *i; | |
691 | uint32_t r; | |
692 | ||
693 | i=dict_find_item(dict,key,required,desc,loc); | |
694 | if (!i) return def; | |
695 | if (i->type!=t_number) { | |
696 | cfgfatal(loc,desc,"\"%s\" must be a number\n",key); | |
697 | } | |
698 | r=i->data.number; | |
699 | return r; | |
700 | } | |
701 | ||
702 | bool_t dict_read_bool(dict_t *dict, string_t key, bool_t required, | |
703 | string_t desc, struct cloc loc, bool_t def) | |
704 | { | |
705 | item_t *i; | |
706 | bool_t r; | |
707 | ||
708 | i=dict_find_item(dict,key,required,desc,loc); | |
709 | if (!i) return def; | |
710 | if (i->type!=t_bool) { | |
711 | cfgfatal(loc,desc,"\"%s\" must be a boolean\n",key); | |
712 | } | |
713 | r=i->data.bool; | |
714 | return r; | |
715 | } | |
716 | ||
717 | static struct subnet string_to_subnet(item_t *i, string_t desc) | |
718 | { | |
719 | struct subnet s; | |
720 | uint32_t a, b, c, d, n; | |
721 | uint32_t match; | |
722 | ||
723 | /* i is not guaranteed to be a string */ | |
724 | if (i->type!=t_string) { | |
725 | cfgfatal(i->loc,desc,"expecting a string (subnet specification)\n"); | |
726 | } | |
727 | ||
728 | /* We expect strings of the form "a.b.c.d[/n]", i.e. the dots are | |
729 | NOT optional. The subnet mask is optional; if missing it is assumed | |
730 | to be /32. */ | |
731 | match=sscanf(i->data.string,"%u.%u.%u.%u/%u", &a, &b, &c, &d, &n); | |
732 | if (match<4) { | |
733 | cfgfatal(i->loc,desc,"\"%s\" is not a valid " | |
734 | "subnet specification\n",i->data.string); | |
735 | } | |
736 | if (match<5) { | |
737 | n=32; | |
738 | } | |
739 | if (a>255 || b>255 || c>255 || d>255 || n>32) { | |
740 | cfgfatal(i->loc,desc,"\"%s\": range error\n",i->data.string); | |
741 | } | |
742 | s.prefix=(a<<24)|(b<<16)|(c<<8)|(d); | |
743 | s.mask=(~0UL << (32-n)); | |
70dc107b | 744 | s.len=n; |
2fe58dfd SE |
745 | if (s.prefix & ~s.mask) { |
746 | cfgfatal(i->loc,desc,"\"%s\": prefix not fully contained " | |
747 | "in mask\n",i->data.string); | |
748 | } | |
749 | return s; | |
750 | } | |
751 | ||
752 | uint32_t string_to_ipaddr(item_t *i, string_t desc) | |
753 | { | |
754 | uint32_t a, b, c, d; | |
755 | uint32_t match; | |
756 | ||
757 | /* i is not guaranteed to be a string */ | |
758 | if (i->type!=t_string) { | |
759 | cfgfatal(i->loc,desc,"expecting a string (IP address)\n"); | |
760 | } | |
761 | ||
762 | match=sscanf(i->data.string,"%u.%u.%u.%u", &a, &b, &c, &d); | |
763 | if (match<4) { | |
764 | cfgfatal(i->loc,desc,"\"%s\" is not a valid " | |
765 | "IP address\n",i->data.string); | |
766 | } | |
767 | if (a>255 || b>255 || c>255 || d>255) { | |
768 | cfgfatal(i->loc,desc,"\"%s\": range error\n",i->data.string); | |
769 | } | |
770 | return (a<<24)|(b<<16)|(c<<8)|(d); | |
771 | } | |
772 | ||
773 | void dict_read_subnet_list(dict_t *dict, string_t key, bool_t required, | |
774 | string_t desc, struct cloc loc, | |
775 | struct subnet_list *sl) | |
776 | { | |
777 | list_t *l, *li; | |
778 | item_t *i; | |
779 | uint32_t e=0; | |
780 | ||
781 | sl->entries=0; | |
782 | sl->list=NULL; | |
783 | l=dict_lookup(dict, key); | |
784 | if (!l) { | |
785 | if (!required) return; | |
786 | cfgfatal(loc,desc,"required parameter \"%s\" not found\n",key); | |
787 | } | |
788 | /* Count the items in the list */ | |
7138d0c5 | 789 | e=list_length(l); |
2fe58dfd SE |
790 | if (e==0) return; |
791 | sl->entries=e; | |
792 | sl->list=safe_malloc(sizeof(struct subnet)*e, "dict_read_subnet_list"); | |
793 | e=0; | |
794 | /* Fill in the list */ | |
795 | for (li=l; li; li=li->next) { | |
796 | i=li->item; | |
797 | if (i->type!=t_string) { | |
798 | cfgfatal(loc,desc,"parameter \"%s\": all elements must " | |
799 | "be strings\n",key); | |
800 | } | |
801 | sl->list[e++]=string_to_subnet(i,desc); | |
802 | } | |
803 | } | |
804 | ||
b2a56f7c SE |
805 | uint32_t string_to_word(string_t s, struct cloc loc, |
806 | struct flagstr *f, string_t desc) | |
807 | { | |
808 | struct flagstr *j; | |
809 | for (j=f; j->name; j++) | |
810 | if (strcmp(s,j->name)==0) | |
811 | return j->value; | |
812 | cfgfatal(loc,desc,"option \"%s\" not known\n",s); | |
813 | return 0; | |
814 | } | |
815 | ||
9d3a4132 SE |
816 | uint32_t string_list_to_word(list_t *l, struct flagstr *f, string_t desc) |
817 | { | |
818 | list_t *i; | |
819 | uint32_t r=0; | |
820 | struct flagstr *j; | |
821 | ||
822 | for (i=l; i; i=i->next) { | |
823 | if (i->item->type!=t_string) { | |
824 | cfgfatal(i->item->loc,desc,"all elements of list must be " | |
825 | "strings\n"); | |
826 | } | |
827 | for (j=f; j->name; j++) | |
b2a56f7c | 828 | r|=string_to_word(i->item->data.string,i->item->loc,f,desc); |
9d3a4132 SE |
829 | } |
830 | return r; | |
831 | } | |
832 | ||
2fe58dfd SE |
833 | dict_t *read_conffile(char *name) |
834 | { | |
835 | FILE *conffile; | |
836 | struct p_node *config; | |
837 | ||
838 | if (strcmp(name,"-")==0) { | |
839 | conffile=stdin; | |
840 | } else { | |
841 | conffile=fopen(name,"r"); | |
842 | if (!conffile) | |
843 | fatal_perror("Cannot open configuration file \"%s\"",name); | |
844 | } | |
845 | config_lineno=1; | |
846 | config_file=name; | |
847 | config=parse_conffile(conffile); | |
848 | fclose(conffile); | |
849 | ||
850 | #ifdef DUMP_PARSE_TREE | |
851 | printf("*** config file parse tree BEFORE MANGLE\n"); | |
852 | ptree_dump(config,0); | |
853 | #endif /* DUMP_PARSE_TREE */ | |
854 | /* The root of the configuration is a T_ALIST, which needs reversing | |
855 | before we mangle because it isn't the child of a T_DICT. */ | |
856 | config=list_reverse(config); | |
857 | ptree_mangle(config); | |
858 | #ifdef DUMP_PARSE_TREE | |
859 | printf("\n\n*** config file parse tree AFTER MANGLE\n"); | |
860 | ptree_dump(config,0); | |
861 | #endif /* DUMP_PARSE_TREE */ | |
862 | return process_config(config); | |
863 | } |