2 * uhttpd - Tiny single-threaded httpd
4 * Copyright (C) 2010-2013 Jo-Philipp Wich <xm@subsignal.org>
5 * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
7 * Permission to use, copy, modify, and/or distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20 #include <libubox/avl-cmp.h>
21 #include <libubox/utils.h>
25 #include "ubus-session.h"
27 static struct avl_tree sessions;
28 static struct blob_buf buf;
30 static const struct blobmsg_policy new_policy = {
31 .name = "timeout", .type = BLOBMSG_TYPE_INT32
34 static const struct blobmsg_policy sid_policy = {
35 .name = "sid", .type = BLOBMSG_TYPE_STRING
43 static const struct blobmsg_policy set_policy[__UH_UBUS_SS_MAX] = {
44 [UH_UBUS_SS_SID] = { .name = "sid", .type = BLOBMSG_TYPE_STRING },
45 [UH_UBUS_SS_VALUES] = { .name = "values", .type = BLOBMSG_TYPE_TABLE },
53 static const struct blobmsg_policy get_policy[__UH_UBUS_SG_MAX] = {
54 [UH_UBUS_SG_SID] = { .name = "sid", .type = BLOBMSG_TYPE_STRING },
55 [UH_UBUS_SG_KEYS] = { .name = "keys", .type = BLOBMSG_TYPE_ARRAY },
63 static const struct blobmsg_policy acl_policy[__UH_UBUS_SA_MAX] = {
64 [UH_UBUS_SA_SID] = { .name = "sid", .type = BLOBMSG_TYPE_STRING },
65 [UH_UBUS_SA_OBJECTS] = { .name = "objects", .type = BLOBMSG_TYPE_ARRAY },
69 * Keys in the AVL tree contain all pattern characters up to the first wildcard.
70 * To look up entries, start with the last entry that has a key less than or
71 * equal to the method name, then work backwards as long as the AVL key still
72 * matches its counterpart in the object name
74 #define uh_foreach_matching_acl_prefix(_acl, _ses, _obj, _func) \
75 for (_acl = avl_find_le_element(&(_ses)->acls, _obj, _acl, avl); \
77 _acl = avl_is_first(&(ses)->acls, &(_acl)->avl) ? NULL : \
78 avl_prev_element((_acl), avl))
80 #define uh_foreach_matching_acl(_acl, _ses, _obj, _func) \
81 uh_foreach_matching_acl_prefix(_acl, _ses, _obj, _func) \
82 if (!strncmp((_acl)->object, _obj, (_acl)->sort_len) && \
83 !fnmatch((_acl)->object, (_obj), FNM_NOESCAPE) && \
84 !fnmatch((_acl)->function, (_func), FNM_NOESCAPE))
87 uh_ubus_random(char *dest)
89 unsigned char buf[16] = { 0 };
93 f = fopen("/dev/urandom", "r");
97 fread(buf, 1, sizeof(buf), f);
100 for (i = 0; i < sizeof(buf); i++)
101 sprintf(dest + (i<<1), "%02x", buf[i]);
105 uh_ubus_session_dump_data(struct uh_ubus_session *ses, struct blob_buf *b)
107 struct uh_ubus_session_data *d;
109 avl_for_each_element(&ses->data, d, avl) {
110 blobmsg_add_field(b, blobmsg_type(d->attr), blobmsg_name(d->attr),
111 blobmsg_data(d->attr), blobmsg_data_len(d->attr));
116 uh_ubus_session_dump_acls(struct uh_ubus_session *ses, struct blob_buf *b)
118 struct uh_ubus_session_acl *acl;
119 const char *lastobj = NULL;
122 avl_for_each_element(&ses->acls, acl, avl) {
123 if (!lastobj || strcmp(acl->object, lastobj))
125 if (c) blobmsg_close_array(b, c);
126 c = blobmsg_open_array(b, acl->object);
129 blobmsg_add_string(b, NULL, acl->function);
130 lastobj = acl->object;
133 if (c) blobmsg_close_array(b, c);
137 uh_ubus_session_dump(struct uh_ubus_session *ses,
138 struct ubus_context *ctx,
139 struct ubus_request_data *req)
143 blob_buf_init(&buf, 0);
145 blobmsg_add_string(&buf, "sid", ses->id);
146 blobmsg_add_u32(&buf, "timeout", ses->timeout);
148 c = blobmsg_open_table(&buf, "acls");
149 uh_ubus_session_dump_acls(ses, &buf);
150 blobmsg_close_table(&buf, c);
152 c = blobmsg_open_table(&buf, "data");
153 uh_ubus_session_dump_data(ses, &buf);
154 blobmsg_close_table(&buf, c);
156 ubus_send_reply(ctx, req, buf.head);
160 uh_ubus_touch_session(struct uh_ubus_session *ses)
162 uloop_timeout_set(&ses->t, ses->timeout * 1000);
166 uh_ubus_session_destroy(struct uh_ubus_session *ses)
168 struct uh_ubus_session_acl *acl, *nacl;
169 struct uh_ubus_session_data *data, *ndata;
171 uloop_timeout_cancel(&ses->t);
172 avl_remove_all_elements(&ses->acls, acl, avl, nacl)
175 avl_remove_all_elements(&ses->data, data, avl, ndata)
178 avl_delete(&sessions, &ses->avl);
182 static void uh_ubus_session_timeout(struct uloop_timeout *t)
184 struct uh_ubus_session *ses;
186 ses = container_of(t, struct uh_ubus_session, t);
187 uh_ubus_session_destroy(ses);
190 static struct uh_ubus_session *
191 uh_ubus_session_create(int timeout)
193 struct uh_ubus_session *ses;
195 ses = calloc(1, sizeof(*ses));
199 ses->timeout = timeout;
200 ses->avl.key = ses->id;
201 uh_ubus_random(ses->id);
203 avl_insert(&sessions, &ses->avl);
204 avl_init(&ses->acls, avl_strcmp, true, NULL);
205 avl_init(&ses->data, avl_strcmp, false, NULL);
207 ses->t.cb = uh_ubus_session_timeout;
208 uh_ubus_touch_session(ses);
213 struct uh_ubus_session *
214 uh_ubus_session_get(const char *id)
216 struct uh_ubus_session *ses;
218 ses = avl_find_element(&sessions, id, ses, avl);
222 uh_ubus_touch_session(ses);
227 uh_ubus_handle_create(struct ubus_context *ctx, struct ubus_object *obj,
228 struct ubus_request_data *req, const char *method,
229 struct blob_attr *msg)
231 struct uh_ubus_session *ses;
232 struct blob_attr *tb;
233 int timeout = UBUS_DEFAULT_SESSION_TIMEOUT;
235 blobmsg_parse(&new_policy, 1, &tb, blob_data(msg), blob_len(msg));
237 timeout = blobmsg_get_u32(tb);
239 ses = uh_ubus_session_create(timeout);
241 uh_ubus_session_dump(ses, ctx, req);
247 uh_ubus_handle_list(struct ubus_context *ctx, struct ubus_object *obj,
248 struct ubus_request_data *req, const char *method,
249 struct blob_attr *msg)
251 struct uh_ubus_session *ses;
252 struct blob_attr *tb;
254 blobmsg_parse(&sid_policy, 1, &tb, blob_data(msg), blob_len(msg));
257 avl_for_each_element(&sessions, ses, avl)
258 uh_ubus_session_dump(ses, ctx, req);
262 ses = uh_ubus_session_get(blobmsg_data(tb));
264 return UBUS_STATUS_NOT_FOUND;
266 uh_ubus_session_dump(ses, ctx, req);
272 uh_id_len(const char *str)
274 return strcspn(str, "*?[");
278 uh_ubus_session_grant(struct uh_ubus_session *ses, struct ubus_context *ctx,
279 const char *object, const char *function)
281 struct uh_ubus_session_acl *acl;
282 char *new_obj, *new_func, *new_id;
285 if (!object || !function)
286 return UBUS_STATUS_INVALID_ARGUMENT;
288 uh_foreach_matching_acl_prefix(acl, ses, object, function) {
289 if (!strcmp(acl->object, object) &&
290 !strcmp(acl->function, function))
294 id_len = uh_id_len(object);
295 acl = calloc_a(sizeof(*acl),
296 &new_obj, strlen(object) + 1,
297 &new_func, strlen(function) + 1,
298 &new_id, id_len + 1);
301 return UBUS_STATUS_UNKNOWN_ERROR;
303 acl->object = strcpy(new_obj, object);
304 acl->function = strcpy(new_func, function);
305 acl->avl.key = strncpy(new_id, object, id_len);
306 avl_insert(&ses->acls, &acl->avl);
312 uh_ubus_session_revoke(struct uh_ubus_session *ses, struct ubus_context *ctx,
313 const char *object, const char *function)
315 struct uh_ubus_session_acl *acl, *next;
319 if (!object && !function) {
320 avl_remove_all_elements(&ses->acls, acl, avl, next)
325 id_len = uh_id_len(object);
326 id = alloca(id_len + 1);
327 strncpy(id, object, id_len);
330 acl = avl_find_element(&ses->acls, id, acl, avl);
332 if (!avl_is_last(&ses->acls, &acl->avl))
333 next = avl_next_element(acl, avl);
337 if (strcmp(id, acl->avl.key) != 0)
340 if (!strcmp(acl->object, object) &&
341 !strcmp(acl->function, function)) {
342 avl_delete(&ses->acls, &acl->avl);
353 uh_ubus_handle_acl(struct ubus_context *ctx, struct ubus_object *obj,
354 struct ubus_request_data *req, const char *method,
355 struct blob_attr *msg)
357 struct uh_ubus_session *ses;
358 struct blob_attr *tb[__UH_UBUS_SA_MAX];
359 struct blob_attr *attr, *sattr;
360 const char *object, *function;
363 int (*cb)(struct uh_ubus_session *ses, struct ubus_context *ctx,
364 const char *object, const char *function);
366 blobmsg_parse(acl_policy, __UH_UBUS_SA_MAX, tb, blob_data(msg), blob_len(msg));
368 if (!tb[UH_UBUS_SA_SID])
369 return UBUS_STATUS_INVALID_ARGUMENT;
371 ses = uh_ubus_session_get(blobmsg_data(tb[UH_UBUS_SA_SID]));
373 return UBUS_STATUS_NOT_FOUND;
375 if (!strcmp(method, "grant"))
376 cb = uh_ubus_session_grant;
378 cb = uh_ubus_session_revoke;
380 if (!tb[UH_UBUS_SA_OBJECTS])
381 return cb(ses, ctx, NULL, NULL);
383 blobmsg_for_each_attr(attr, tb[UH_UBUS_SA_OBJECTS], rem1) {
384 if (blob_id(attr) != BLOBMSG_TYPE_ARRAY)
390 blobmsg_for_each_attr(sattr, attr, rem2) {
391 if (blob_id(sattr) != BLOBMSG_TYPE_STRING)
395 object = blobmsg_data(sattr);
397 function = blobmsg_data(sattr);
402 if (object && function)
403 cb(ses, ctx, object, function);
410 uh_ubus_handle_set(struct ubus_context *ctx, struct ubus_object *obj,
411 struct ubus_request_data *req, const char *method,
412 struct blob_attr *msg)
414 struct uh_ubus_session *ses;
415 struct uh_ubus_session_data *data;
416 struct blob_attr *tb[__UH_UBUS_SA_MAX];
417 struct blob_attr *attr;
420 blobmsg_parse(set_policy, __UH_UBUS_SS_MAX, tb, blob_data(msg), blob_len(msg));
422 if (!tb[UH_UBUS_SS_SID] || !tb[UH_UBUS_SS_VALUES])
423 return UBUS_STATUS_INVALID_ARGUMENT;
425 ses = uh_ubus_session_get(blobmsg_data(tb[UH_UBUS_SS_SID]));
427 return UBUS_STATUS_NOT_FOUND;
429 blobmsg_for_each_attr(attr, tb[UH_UBUS_SS_VALUES], rem) {
430 if (!blobmsg_name(attr)[0])
433 data = avl_find_element(&ses->data, blobmsg_name(attr), data, avl);
435 avl_delete(&ses->data, &data->avl);
439 data = calloc(1, sizeof(*data) + blob_pad_len(attr));
443 memcpy(data->attr, attr, blob_pad_len(attr));
444 data->avl.key = blobmsg_name(data->attr);
445 avl_insert(&ses->data, &data->avl);
452 uh_ubus_handle_get(struct ubus_context *ctx, struct ubus_object *obj,
453 struct ubus_request_data *req, const char *method,
454 struct blob_attr *msg)
456 struct uh_ubus_session *ses;
457 struct uh_ubus_session_data *data;
458 struct blob_attr *tb[__UH_UBUS_SA_MAX];
459 struct blob_attr *attr;
463 blobmsg_parse(get_policy, __UH_UBUS_SG_MAX, tb, blob_data(msg), blob_len(msg));
465 if (!tb[UH_UBUS_SG_SID])
466 return UBUS_STATUS_INVALID_ARGUMENT;
468 ses = uh_ubus_session_get(blobmsg_data(tb[UH_UBUS_SG_SID]));
470 return UBUS_STATUS_NOT_FOUND;
472 blob_buf_init(&buf, 0);
473 c = blobmsg_open_table(&buf, "values");
475 if (!tb[UH_UBUS_SG_KEYS]) {
476 uh_ubus_session_dump_data(ses, &buf);
480 blobmsg_for_each_attr(attr, tb[UH_UBUS_SG_KEYS], rem) {
481 if (blob_id(attr) != BLOBMSG_TYPE_STRING)
484 data = avl_find_element(&ses->data, blobmsg_data(attr), data, avl);
488 blobmsg_add_field(&buf, blobmsg_type(data->attr),
489 blobmsg_name(data->attr),
490 blobmsg_data(data->attr),
491 blobmsg_data_len(data->attr));
494 blobmsg_close_table(&buf, c);
495 ubus_send_reply(ctx, req, buf.head);
501 uh_ubus_handle_unset(struct ubus_context *ctx, struct ubus_object *obj,
502 struct ubus_request_data *req, const char *method,
503 struct blob_attr *msg)
505 struct uh_ubus_session *ses;
506 struct uh_ubus_session_data *data, *ndata;
507 struct blob_attr *tb[__UH_UBUS_SA_MAX];
508 struct blob_attr *attr;
511 blobmsg_parse(get_policy, __UH_UBUS_SG_MAX, tb, blob_data(msg), blob_len(msg));
513 if (!tb[UH_UBUS_SG_SID])
514 return UBUS_STATUS_INVALID_ARGUMENT;
516 ses = uh_ubus_session_get(blobmsg_data(tb[UH_UBUS_SG_SID]));
518 return UBUS_STATUS_NOT_FOUND;
520 if (!tb[UH_UBUS_SG_KEYS]) {
521 avl_remove_all_elements(&ses->data, data, avl, ndata)
526 blobmsg_for_each_attr(attr, tb[UH_UBUS_SG_KEYS], rem) {
527 if (blob_id(attr) != BLOBMSG_TYPE_STRING)
530 data = avl_find_element(&ses->data, blobmsg_data(attr), data, avl);
534 avl_delete(&ses->data, &data->avl);
542 uh_ubus_handle_destroy(struct ubus_context *ctx, struct ubus_object *obj,
543 struct ubus_request_data *req, const char *method,
544 struct blob_attr *msg)
546 struct uh_ubus_session *ses;
547 struct blob_attr *tb;
549 blobmsg_parse(&sid_policy, 1, &tb, blob_data(msg), blob_len(msg));
552 return UBUS_STATUS_INVALID_ARGUMENT;
554 ses = uh_ubus_session_get(blobmsg_data(tb));
556 return UBUS_STATUS_NOT_FOUND;
558 uh_ubus_session_destroy(ses);
563 bool uh_ubus_session_acl_allowed(struct uh_ubus_session *ses, const char *obj, const char *fun)
565 struct uh_ubus_session_acl *acl;
567 uh_foreach_matching_acl(acl, ses, obj, fun)
573 int ubus_session_api_init(struct ubus_context *ctx)
575 static const struct ubus_method session_methods[] = {
576 UBUS_METHOD("create", uh_ubus_handle_create, &new_policy),
577 UBUS_METHOD("list", uh_ubus_handle_list, &sid_policy),
578 UBUS_METHOD("grant", uh_ubus_handle_acl, acl_policy),
579 UBUS_METHOD("revoke", uh_ubus_handle_acl, acl_policy),
580 UBUS_METHOD("set", uh_ubus_handle_set, set_policy),
581 UBUS_METHOD("get", uh_ubus_handle_get, get_policy),
582 UBUS_METHOD("unset", uh_ubus_handle_unset, get_policy),
583 UBUS_METHOD("destroy", uh_ubus_handle_destroy, &sid_policy),
586 static struct ubus_object_type session_type =
587 UBUS_OBJECT_TYPE("uhttpd", session_methods);
589 static struct ubus_object obj = {
591 .type = &session_type,
592 .methods = session_methods,
593 .n_methods = ARRAY_SIZE(session_methods),
596 avl_init(&sessions, avl_strcmp, false, NULL);
598 return ubus_add_object(ctx, &obj);