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35 #include "jansson_iterators.h"
39 #include <tr_filter.h>
42 #include <trust_router/tr_constraint.h>
43 #include <tid_internal.h>
45 /* Returns TRUE (1) if the the string (str) matchs the wildcard string (wc_str), FALSE (0) if not.
47 int tr_prefix_wildcard_match (const char *str, const char *wc_str) {
48 const char *wc_post = wc_str;
52 if ((!str) || (!wc_str))
56 if (0 == (wc_len = strlen(wc_str)))
59 /* TBD -- skip leading white space? */
60 if ('*' == wc_str[0]) {
61 wc_post = &(wc_str[1]);
63 }else if (len != wc_len)
70 if (0 == strcmp(&(str[len-wc_len]), wc_post)) {
77 TR_CONSTRAINT_SET *tr_constraint_set_from_fline (TR_FLINE *fline)
84 if (fline->realm_cons)
85 tr_constraint_add_to_set((TR_CONSTRAINT_SET **)&cset, fline->realm_cons);
86 if (fline->domain_cons)
87 tr_constraint_add_to_set((TR_CONSTRAINT_SET **)&cset, fline->domain_cons);
89 return (TR_CONSTRAINT_SET *) cset;
92 /* A constraint set is represented in json as an array of constraint
93 * objects. So, a constraint set (cset) that consists of one realm
94 * constraint and one domain constraint might look like:
96 * {cset: [{domain: [a.com, b.co.uk]},
97 * {realm: [c.net, d.org]}]}
100 void tr_constraint_add_to_set (TR_CONSTRAINT_SET **cset, TR_CONSTRAINT *cons)
102 json_t *jcons = NULL;
103 json_t *jmatches = NULL;
106 if ((!cset) || (!cons))
109 /* If we don't already have a json object, create one */
111 *cset = (TR_CONSTRAINT_SET *) json_array();
113 /* Create a json object representing cons */
114 jmatches = json_array();
115 jcons = json_object();
117 for (i = 0; ((i < TR_MAX_CONST_MATCHES) && (NULL != cons->matches[i])); i++) {
118 json_array_append_new(jmatches, json_string(cons->matches[i]->buf));
121 json_object_set_new(jcons, cons->type->buf, jmatches);
123 /* Add the created object to the cset object */
124 json_array_append_new((json_t *) *cset, jcons);
127 int tr_constraint_set_validate(TR_CONSTRAINT_SET *cset)
129 json_t *json = (json_t *) cset;
132 if (!json_is_array(json)){
133 tr_debug("Constraint_set is not an array");
136 json_array_foreach(json, i, set_member) {
139 if (!json_is_object(set_member)) {
140 tr_debug("Constraint member at %zu is not an object\n", i);
143 json_object_foreach( set_member, key, value) {
146 if (!json_is_array(value)) {
147 tr_debug("Constraint type %s at index %zu in constraint set is not an array\n", key,
151 json_array_foreach(value, inner_index, inner_value) {
152 if (!json_is_string(inner_value)) {
153 tr_debug("Constraint type %s at index %zu in constraint set has non-string element %zu\n",
154 key, i, inner_index);
164 TR_CONSTRAINT_SET *tr_constraint_set_filter( TID_REQ *request,
165 TR_CONSTRAINT_SET *orig,
166 const char *constraint_type)
168 json_t *orig_cset = (json_t*) orig;
169 json_t *new_cs = NULL;
172 if (!tr_constraint_set_validate( (TR_CONSTRAINT_SET *) orig_cset)) {
173 tr_debug ("tr_constraint_set_filter: not a valid constraint set\n");
176 assert (new_cs = json_array());
177 json_array_foreach(orig_cset, index, set_member) {
178 if (json_object_get( set_member, constraint_type))
179 json_array_append(new_cs, set_member);
181 return (TR_CONSTRAINT_SET *) new_cs;
185 * Within a given constraint object merge any overlapping domain or
186 * realm constraints. For example ['*','*.net'] can be simplified to
189 static void merge_constraints(json_t *constraint, const char *key)
191 json_t *value_1, *value_2, *constraint_array;
192 size_t index_1, index_2;
194 * Go through the loop pairwise linear, removing elements where one
195 * element is a subset of the other. Always shrik the array from
196 * the end so that index_1 never becomes invalid (swapping if
199 constraint_array = json_object_get(constraint, key);
200 if (NULL == constraint_array)
202 json_array_foreach( constraint_array, index_1, value_1)
203 json_array_foreach( constraint_array, index_2, value_2) {
204 if (index_2 <= index_1)
206 if ( tr_prefix_wildcard_match( json_string_value(value_2),
207 json_string_value(value_1))) {
208 json_array_remove(constraint_array, index_2);
210 }else if (tr_prefix_wildcard_match( json_string_value(value_1),
211 json_string_value(value_2))) {
212 json_array_set(constraint_array, index_1, value_2);
213 json_array_remove(constraint_array, index_2);
220 * Returns an array of constraint strings that is the intersection of
221 * all constraints in the constraint_set of type #type
223 static json_t *constraint_intersect_internal( TR_CONSTRAINT_SET *constraints,
224 const char *constraint_type)
226 json_t *constraint, *result = NULL;
228 json_array_foreach( (json_t *) constraints, i, constraint) {
229 merge_constraints( constraint, constraint_type);
230 if (NULL == result) {
231 result = json_object_get(constraint, constraint_type);
233 result = json_copy(result);
235 json_t *intersect, *value_1, *value_2;
236 size_t index_1, index_2;
237 intersect = json_object_get(constraint, constraint_type);
238 /*If an element of the constraint set doesn't have a particular
239 * constraint type, we ignore that element of the constraint set.
240 * However, if no element of the constraint set has a particular
241 * constraint type we return empty (no access) rather than universal
246 json_array_foreach(result, index_1, value_1) {
247 json_array_foreach(intersect, index_2, value_2) {
248 if (tr_prefix_wildcard_match( json_string_value(value_1),
249 json_string_value(value_2)))
250 goto result_acceptable;
251 else if (tr_prefix_wildcard_match(json_string_value( value_2),
252 json_string_value(value_1))) {
253 json_array_set(result, index_1, value_2);
254 goto result_acceptable;
257 json_array_remove(result, index_1);
261 result_acceptable: continue;
269 * Return the intersection of domain and realm constraints.
270 * Return is live until #request is freed.
272 TR_CONSTRAINT_SET *tr_constraint_set_intersect( TID_REQ *request,
273 TR_CONSTRAINT_SET *input)
275 json_t *domain=NULL, *realm=NULL;
276 json_t *result = NULL, *result_array = NULL;
277 if (tr_constraint_set_validate(input)) {
278 domain = constraint_intersect_internal(input, "domain");
279 realm = constraint_intersect_internal(input, "realm");
281 assert(result = json_object());
283 json_object_set_new(result, "domain", domain);
285 json_object_set_new(result, "realm", realm);
286 assert(result_array = json_array());
287 json_array_append_new(result_array, result);
288 tid_req_cleanup_json( request, result_array);
289 return (TR_CONSTRAINT_SET *) result_array;
293 int tr_constraint_set_get_match_strings(
295 TR_CONSTRAINT_SET *constraints,
296 const char *constraint_type,
297 tr_const_string **output,
300 json_t *cset = (json_t *) constraints;
301 json_t *member, *matches, *value;;
302 size_t index, array_size;
303 assert (output && output_len);
306 if (json_array_size(cset) != 1) {
307 tr_debug("Constraint set for get_match_strings has more than one member\n");
310 member = json_array_get(cset, 0);
311 matches = json_object_get(member, constraint_type);
314 array_size = json_array_size(matches);
317 *output = talloc_array_ptrtype(request, *output, array_size);
318 json_array_foreach( matches, index, value)
319 (*output)[index] = json_string_value(value);
320 *output_len = array_size;