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42 #include <tr_filter.h>
43 #include <trp_internal.h>
44 #include <tid_internal.h>
46 /* Function types for handling filter fields generally. All target values
47 * are represented as strings in a TR_NAME.
49 typedef int (*TR_FILTER_FIELD_CMP)(void *target, TR_NAME *val); /* returns 1 on match, 0 on no match */
50 typedef TR_NAME *(*TR_FILTER_FIELD_GET)(void *target); /* returns string form of the field value */
52 /* static handler prototypes */
53 static int tr_ff_cmp_tid_rp_realm(void *rp_req_arg, TR_NAME *val);
54 static TR_NAME *tr_ff_get_tid_rp_realm(void *rp_req_arg);
55 static int tr_ff_cmp_trp_info_type(void *inforec_arg, TR_NAME *val);
56 static TR_NAME *tr_ff_get_trp_info_type(void *inforec_arg);
59 * Filter field handler table
61 struct tr_filter_field_entry {
62 TR_FILTER_TYPE filter_type;
64 TR_FILTER_FIELD_CMP cmp;
65 TR_FILTER_FIELD_GET get;
67 static struct tr_filter_field_entry tr_filter_field_table[] = {
68 {TR_FILTER_TYPE_TID_INBOUND, "rp_realm", tr_ff_cmp_tid_rp_realm, tr_ff_get_tid_rp_realm},
69 {TR_FILTER_TYPE_TRP_INBOUND, "info_type", tr_ff_cmp_trp_info_type, tr_ff_get_trp_info_type},
70 {TR_FILTER_TYPE_TRP_OUTBOUND, "info_type", tr_ff_cmp_trp_info_type, tr_ff_get_trp_info_type},
71 {TR_FILTER_TYPE_UNKNOWN, NULL } /* This must be the final entry */
74 static struct tr_filter_field_entry *tr_filter_field_entry(TR_FILTER_TYPE filter_type, TR_NAME *field_name)
78 for (ii=0; tr_filter_field_table[ii].filter_type!=TR_FILTER_TYPE_UNKNOWN; ii++) {
79 if ((tr_filter_field_table[ii].filter_type==filter_type)
80 && (tr_name_cmp_str(field_name, tr_filter_field_table[ii].name)==0)) {
81 return tr_filter_field_table+ii;
87 static int tr_ff_cmp_tid_rp_realm(void *rp_req_arg, TR_NAME *val)
89 TID_REQ *req=talloc_get_type_abort(rp_req_arg, TID_REQ);
91 return 0==tr_name_cmp(val, req->rp_realm);
94 static TR_NAME *tr_ff_get_tid_rp_realm(void *rp_req_arg)
96 TID_REQ *req=talloc_get_type_abort(rp_req_arg, TID_REQ);
98 return tr_dup_name(req->rp_realm);
101 static int tr_ff_cmp_trp_info_type(void *inforec_arg, TR_NAME *val)
103 TRP_INFOREC *inforec=talloc_get_type_abort(inforec_arg, TRP_INFOREC);
110 /* nothing matches unknown */
111 if (inforec->type==TRP_INFOREC_TYPE_UNKNOWN)
114 valstr = tr_name_strdup(val); /* get this as an official null-terminated string */
115 val_type = trp_inforec_type_from_string(valstr);
118 return (val_type==inforec->type);
121 static TR_NAME *tr_ff_get_trp_info_type(void *inforec_arg)
123 TRP_INFOREC *inforec=talloc_get_type_abort(inforec_arg, TRP_INFOREC);
124 return tr_new_name(trp_inforec_type_to_string(inforec->type));
128 * Apply a filter to a target record or TID request.
130 * If one of the filter lines matches, out_action is set to the applicable action. If constraints
131 * is not NULL, the constraints from the matching filter line will be added to the constraint set
132 * *constraints, or to a new one if *constraints is NULL. In this case, TR_FILTER_MATCH will be
135 * If there is no match, returns TR_FILTER_NO_MATCH, out_action is undefined, and constraints
136 * will not be changed.
138 * @param target Record or request to which the filter is applied
139 * @param filt Filter to apply
140 * @param constraints Pointer to existing set of constraints (NULL if not tracking constraints)
141 * @param out_action Action to be carried out (output)
142 * @return TR_FILTER_MATCH or TR_FILTER_NO_MATCH
144 int tr_filter_apply(void *target,
146 TR_CONSTRAINT_SET **constraints,
147 TR_FILTER_ACTION *out_action)
149 unsigned int ii=0, jj=0;
150 int retval=TR_FILTER_NO_MATCH;
152 /* Default action is reject */
153 *out_action = TR_FILTER_ACTION_REJECT;
155 /* Validate filter */
156 if ((filt==NULL) || (filt->type==TR_FILTER_TYPE_UNKNOWN))
157 return TR_FILTER_NO_MATCH;
159 /* Step through filter lines looking for a match. If a line matches, retval
160 * will be set to TR_FILTER_MATCH, so stop then. */
161 for (ii=0, retval=TR_FILTER_NO_MATCH;
162 ii<TR_MAX_FILTER_LINES;
164 /* skip empty lines (these shouldn't really happen) */
165 if (filt->lines[ii]==NULL)
168 /* Assume we are going to succeed. If any specs fail to match, we'll set
169 * this to TR_FILTER_NO_MATCH. */
170 retval=TR_FILTER_MATCH;
171 for (jj=0; jj<TR_MAX_FILTER_SPECS; jj++) {
172 /* skip empty specs (these shouldn't really happen either) */
173 if (filt->lines[ii]->specs[jj]==NULL)
176 if (!tr_fspec_matches(filt->lines[ii]->specs[jj], filt->type, target)) {
177 retval=TR_FILTER_NO_MATCH; /* set this in case this is the last filter line */
178 break; /* give up on this filter line */
182 if (retval==TR_FILTER_MATCH)
186 if (retval==TR_FILTER_MATCH) {
187 /* Matched line ii. Grab its action and constraints. */
188 *out_action = filt->lines[ii]->action;
189 if (constraints!=NULL) {
190 /* if either constraint is missing, these are no-ops */
191 tr_constraint_add_to_set(constraints, filt->lines[ii]->realm_cons);
192 tr_constraint_add_to_set(constraints, filt->lines[ii]->domain_cons);
199 int tr_filter_process_rp_permitted(TR_NAME *rp_realm,
200 TR_FILTER *rpp_filter,
201 TR_CONSTRAINT_SET *in_constraints,
202 TR_CONSTRAINT_SET **out_constraints,
203 TR_FILTER_ACTION *out_action)
207 *out_action = TR_FILTER_ACTION_REJECT;
208 *out_constraints = NULL;
210 /* If this isn't a valid rp_permitted filter, return no match. */
212 (TR_FILTER_TYPE_TID_INBOUND != rpp_filter->type)) {
213 return TR_FILTER_NO_MATCH;
216 /* Check if there is a match for this filter. */
217 for (i = 0; i < TR_MAX_FILTER_LINES; i++) {
218 for (j = 0; j < TR_MAX_FILTER_SPECS; j++) {
220 if ((rpp_filter->lines[i]) &&
221 (rpp_filter->lines[i]->specs[j]) &&
222 (tr_fspec_matches(rpp_filter->lines[i]->specs[j], 0, rp_realm))) { /* todo: fix or remove */
223 *out_action = rpp_filter->lines[i]->action;
224 *out_constraints = in_constraints;
225 if (rpp_filter->lines[i]->realm_cons)
226 tr_constraint_add_to_set(out_constraints,
227 rpp_filter->lines[i]->realm_cons);
228 if (rpp_filter->lines[i]->domain_cons)
229 tr_constraint_add_to_set(out_constraints,
230 rpp_filter->lines[i]->domain_cons);
232 return TR_FILTER_MATCH;
236 /* If there is no match, indicate that. */
237 return TR_FILTER_NO_MATCH;
240 void tr_fspec_free(TR_FSPEC *fspec)
245 static int tr_fspec_destructor(void *obj)
247 TR_FSPEC *fspec = talloc_get_type_abort(obj, TR_FSPEC);
250 if (fspec->field != NULL)
251 tr_free_name(fspec->field);
252 for (ii=0; ii<TR_MAX_FILTER_SPEC_MATCHES; ii++) {
253 if (fspec->match[ii] != NULL)
254 tr_free_name(fspec->match[ii]);
259 TR_FSPEC *tr_fspec_new(TALLOC_CTX *mem_ctx)
261 TR_FSPEC *fspec = talloc(mem_ctx, TR_FSPEC);
266 for (ii=0; ii<TR_MAX_FILTER_SPEC_MATCHES; ii++)
267 fspec->match[ii] = NULL;
269 talloc_set_destructor((void *)fspec, tr_fspec_destructor);
274 void tr_fspec_add_match(TR_FSPEC *fspec, TR_NAME *match)
277 for (ii=0; ii<TR_MAX_FILTER_SPEC_MATCHES; ii++) {
278 if (fspec->match[ii]==NULL) {
279 fspec->match[ii]=match;
283 /* TODO: handle case that adding the match failed */
286 /* returns 1 if the spec matches */
287 int tr_fspec_matches(TR_FSPEC *fspec, TR_FILTER_TYPE ftype, void *target)
289 struct tr_filter_field_entry *field=NULL;
296 /* Look up how to handle the requested field */
297 field = tr_filter_field_entry(ftype, fspec->field);
301 name=field->get(target);
302 for (ii=0; ii<TR_MAX_FILTER_SPEC_MATCHES; ii++) {
303 if (fspec->match[ii]!=NULL) {
304 if (tr_name_prefix_wildcard_match(name, fspec->match[ii]))
311 void tr_fline_free(TR_FLINE *fline)
316 TR_FLINE *tr_fline_new(TALLOC_CTX *mem_ctx)
318 TR_FLINE *fl = talloc(mem_ctx, TR_FLINE);
322 fl->action = TR_FILTER_ACTION_UNKNOWN;
323 fl->realm_cons = NULL;
324 fl->domain_cons = NULL;
325 for (ii = 0; ii < TR_MAX_FILTER_SPECS; ii++)
326 fl->specs[ii] = NULL;
331 TR_FILTER *tr_filter_new(TALLOC_CTX *mem_ctx)
333 TR_FILTER *f = talloc(mem_ctx, TR_FILTER);
337 f->type = TR_FILTER_TYPE_UNKNOWN;
338 for (ii = 0; ii < TR_MAX_FILTER_LINES; ii++)
344 void tr_filter_free(TR_FILTER *filt)
349 void tr_filter_set_type(TR_FILTER *filt, TR_FILTER_TYPE type)
354 TR_FILTER_TYPE tr_filter_get_type(TR_FILTER *filt)
360 * Check that a filter is valid, i.e., can be processed.
362 * @param filt Filter to verify
363 * @return 1 if the filter is valid, 0 otherwise
365 int tr_filter_validate(TR_FILTER *filt)
367 size_t ii=0, jj=0, kk=0;
372 /* check that we recognize the type */
374 case TR_FILTER_TYPE_TID_INBOUND:
375 case TR_FILTER_TYPE_TRP_INBOUND:
376 case TR_FILTER_TYPE_TRP_OUTBOUND:
380 return 0; /* if we get here, either TR_FILTER_TYPE_UNKNOWN or an invalid value was found */
382 for (ii=0; ii<TR_MAX_FILTER_LINES; ii++) {
383 if (filt->lines[ii]==NULL)
384 continue; /* an empty filter line is valid */
386 /* check that we recognize the action */
387 switch(filt->lines[ii]->action) {
388 case TR_FILTER_ACTION_ACCEPT:
389 case TR_FILTER_ACTION_REJECT:
393 /* if we get here, either TR_FILTER_ACTION_UNKNOWN or an invalid value was found */
397 for (jj=0; jj<TR_MAX_FILTER_SPECS; jj++) {
398 if (filt->lines[ii]->specs[jj]==NULL)
399 continue; /* an empty filter spec is valid */
401 if (!tr_filter_validate_spec_field(filt->type, filt->lines[ii]->specs[jj]))
404 /* check that at least one match is non-null */
405 for (kk=0; kk<TR_MAX_FILTER_SPEC_MATCHES; kk++) {
406 if (filt->lines[ii]->specs[jj]->match[kk]!=NULL)
409 if (kk==TR_MAX_FILTER_SPEC_MATCHES)
414 /* We ran the gauntlet. Success! */
418 int tr_filter_validate_spec_field(TR_FILTER_TYPE ftype, TR_FSPEC *fspec)
420 if ((fspec==NULL) || (tr_filter_field_entry(ftype, fspec->field)==NULL))
421 return 0; /* unknown field */
427 * Allocate a new filter set.
429 * @param mem_ctx Talloc context for the new set
430 * @return Pointer to new set, or null on error
432 TR_FILTER_SET *tr_filter_set_new(TALLOC_CTX *mem_ctx)
434 TR_FILTER_SET *set=talloc(mem_ctx, TR_FILTER_SET);
445 * @param fs Filter set to free
447 void tr_filter_set_free(TR_FILTER_SET *fs)
453 * Find the tail of the filter set linked list.
455 * @param set Set to find tail of
456 * @return Last element in the list
458 static TR_FILTER_SET *tr_filter_set_tail(TR_FILTER_SET *set)
466 * Add new filter to filter set.
468 * @param set Filter set
469 * @param new New filter to add
470 * @return 0 on success, nonzero on error
472 int tr_filter_set_add(TR_FILTER_SET *set, TR_FILTER *new)
474 TR_FILTER_SET *tail=NULL;
479 tail=tr_filter_set_tail(set);
480 tail->next=tr_filter_set_new(set);
481 if (tail->next==NULL)
486 talloc_steal(tail, new);
491 * Find a filter of a given type in the filter set. If there are multiple, returns the first one.
493 * @param set Filter set to search
494 * @param type Type of filter to find
495 * @return Borrowed pointer to the filter, or null if no filter of that type is found
497 TR_FILTER *tr_filter_set_get(TR_FILTER_SET *set, TR_FILTER_TYPE type)
499 TR_FILTER_SET *cur=set;
501 if ((cur->this != NULL) && (cur->this->type == type))
508 TR_FILTER_TYPE filter_type[]={TR_FILTER_TYPE_TID_INBOUND,
509 TR_FILTER_TYPE_TRP_INBOUND,
510 TR_FILTER_TYPE_TRP_OUTBOUND};
511 const char *filter_label[]={"tid_inbound",
514 size_t num_filter_types=sizeof(filter_type)/sizeof(filter_type[0]);
516 const char *tr_filter_type_to_string(TR_FILTER_TYPE ftype)
520 for (ii=0; ii<num_filter_types; ii++) {
521 if (ftype==filter_type[ii])
522 return filter_label[ii];
527 TR_FILTER_TYPE tr_filter_type_from_string(const char *s)
531 for(ii=0; ii<num_filter_types; ii++) {
532 if (0==strcmp(s, filter_label[ii]))
533 return filter_type[ii];
535 return TR_FILTER_TYPE_UNKNOWN;