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);
147 blobmsg_add_u32(&buf, "expires", uloop_timeout_remaining(&ses->t) / 1000);
149 c = blobmsg_open_table(&buf, "acls");
150 uh_ubus_session_dump_acls(ses, &buf);
151 blobmsg_close_table(&buf, c);
153 c = blobmsg_open_table(&buf, "data");
154 uh_ubus_session_dump_data(ses, &buf);
155 blobmsg_close_table(&buf, c);
157 ubus_send_reply(ctx, req, buf.head);
161 uh_ubus_touch_session(struct uh_ubus_session *ses)
163 uloop_timeout_set(&ses->t, ses->timeout * 1000);
167 uh_ubus_session_destroy(struct uh_ubus_session *ses)
169 struct uh_ubus_session_acl *acl, *nacl;
170 struct uh_ubus_session_data *data, *ndata;
172 uloop_timeout_cancel(&ses->t);
173 avl_remove_all_elements(&ses->acls, acl, avl, nacl)
176 avl_remove_all_elements(&ses->data, data, avl, ndata)
179 avl_delete(&sessions, &ses->avl);
183 static void uh_ubus_session_timeout(struct uloop_timeout *t)
185 struct uh_ubus_session *ses;
187 ses = container_of(t, struct uh_ubus_session, t);
188 uh_ubus_session_destroy(ses);
191 static struct uh_ubus_session *
192 uh_ubus_session_create(int timeout)
194 struct uh_ubus_session *ses;
196 ses = calloc(1, sizeof(*ses));
200 ses->timeout = timeout;
201 ses->avl.key = ses->id;
202 uh_ubus_random(ses->id);
204 avl_insert(&sessions, &ses->avl);
205 avl_init(&ses->acls, avl_strcmp, true, NULL);
206 avl_init(&ses->data, avl_strcmp, false, NULL);
208 ses->t.cb = uh_ubus_session_timeout;
209 uh_ubus_touch_session(ses);
214 struct uh_ubus_session *
215 uh_ubus_session_get(const char *id)
217 struct uh_ubus_session *ses;
219 ses = avl_find_element(&sessions, id, ses, avl);
223 uh_ubus_touch_session(ses);
228 uh_ubus_handle_create(struct ubus_context *ctx, struct ubus_object *obj,
229 struct ubus_request_data *req, const char *method,
230 struct blob_attr *msg)
232 struct uh_ubus_session *ses;
233 struct blob_attr *tb;
234 int timeout = UBUS_DEFAULT_SESSION_TIMEOUT;
236 blobmsg_parse(&new_policy, 1, &tb, blob_data(msg), blob_len(msg));
238 timeout = blobmsg_get_u32(tb);
240 ses = uh_ubus_session_create(timeout);
242 uh_ubus_session_dump(ses, ctx, req);
248 uh_ubus_handle_list(struct ubus_context *ctx, struct ubus_object *obj,
249 struct ubus_request_data *req, const char *method,
250 struct blob_attr *msg)
252 struct uh_ubus_session *ses;
253 struct blob_attr *tb;
255 blobmsg_parse(&sid_policy, 1, &tb, blob_data(msg), blob_len(msg));
258 avl_for_each_element(&sessions, ses, avl)
259 uh_ubus_session_dump(ses, ctx, req);
263 ses = uh_ubus_session_get(blobmsg_data(tb));
265 return UBUS_STATUS_NOT_FOUND;
267 uh_ubus_session_dump(ses, ctx, req);
273 uh_id_len(const char *str)
275 return strcspn(str, "*?[");
279 uh_ubus_session_grant(struct uh_ubus_session *ses, struct ubus_context *ctx,
280 const char *object, const char *function)
282 struct uh_ubus_session_acl *acl;
283 char *new_obj, *new_func, *new_id;
286 if (!object || !function)
287 return UBUS_STATUS_INVALID_ARGUMENT;
289 uh_foreach_matching_acl_prefix(acl, ses, object, function) {
290 if (!strcmp(acl->object, object) &&
291 !strcmp(acl->function, function))
295 id_len = uh_id_len(object);
296 acl = calloc_a(sizeof(*acl),
297 &new_obj, strlen(object) + 1,
298 &new_func, strlen(function) + 1,
299 &new_id, id_len + 1);
302 return UBUS_STATUS_UNKNOWN_ERROR;
304 acl->object = strcpy(new_obj, object);
305 acl->function = strcpy(new_func, function);
306 acl->avl.key = strncpy(new_id, object, id_len);
307 avl_insert(&ses->acls, &acl->avl);
313 uh_ubus_session_revoke(struct uh_ubus_session *ses, struct ubus_context *ctx,
314 const char *object, const char *function)
316 struct uh_ubus_session_acl *acl, *next;
320 if (!object && !function) {
321 avl_remove_all_elements(&ses->acls, acl, avl, next)
326 id_len = uh_id_len(object);
327 id = alloca(id_len + 1);
328 strncpy(id, object, id_len);
331 acl = avl_find_element(&ses->acls, id, acl, avl);
333 if (!avl_is_last(&ses->acls, &acl->avl))
334 next = avl_next_element(acl, avl);
338 if (strcmp(id, acl->avl.key) != 0)
341 if (!strcmp(acl->object, object) &&
342 !strcmp(acl->function, function)) {
343 avl_delete(&ses->acls, &acl->avl);
354 uh_ubus_handle_acl(struct ubus_context *ctx, struct ubus_object *obj,
355 struct ubus_request_data *req, const char *method,
356 struct blob_attr *msg)
358 struct uh_ubus_session *ses;
359 struct blob_attr *tb[__UH_UBUS_SA_MAX];
360 struct blob_attr *attr, *sattr;
361 const char *object, *function;
364 int (*cb)(struct uh_ubus_session *ses, struct ubus_context *ctx,
365 const char *object, const char *function);
367 blobmsg_parse(acl_policy, __UH_UBUS_SA_MAX, tb, blob_data(msg), blob_len(msg));
369 if (!tb[UH_UBUS_SA_SID])
370 return UBUS_STATUS_INVALID_ARGUMENT;
372 ses = uh_ubus_session_get(blobmsg_data(tb[UH_UBUS_SA_SID]));
374 return UBUS_STATUS_NOT_FOUND;
376 if (!strcmp(method, "grant"))
377 cb = uh_ubus_session_grant;
379 cb = uh_ubus_session_revoke;
381 if (!tb[UH_UBUS_SA_OBJECTS])
382 return cb(ses, ctx, NULL, NULL);
384 blobmsg_for_each_attr(attr, tb[UH_UBUS_SA_OBJECTS], rem1) {
385 if (blob_id(attr) != BLOBMSG_TYPE_ARRAY)
391 blobmsg_for_each_attr(sattr, attr, rem2) {
392 if (blob_id(sattr) != BLOBMSG_TYPE_STRING)
396 object = blobmsg_data(sattr);
398 function = blobmsg_data(sattr);
403 if (object && function)
404 cb(ses, ctx, object, function);
411 uh_ubus_handle_set(struct ubus_context *ctx, struct ubus_object *obj,
412 struct ubus_request_data *req, const char *method,
413 struct blob_attr *msg)
415 struct uh_ubus_session *ses;
416 struct uh_ubus_session_data *data;
417 struct blob_attr *tb[__UH_UBUS_SA_MAX];
418 struct blob_attr *attr;
421 blobmsg_parse(set_policy, __UH_UBUS_SS_MAX, tb, blob_data(msg), blob_len(msg));
423 if (!tb[UH_UBUS_SS_SID] || !tb[UH_UBUS_SS_VALUES])
424 return UBUS_STATUS_INVALID_ARGUMENT;
426 ses = uh_ubus_session_get(blobmsg_data(tb[UH_UBUS_SS_SID]));
428 return UBUS_STATUS_NOT_FOUND;
430 blobmsg_for_each_attr(attr, tb[UH_UBUS_SS_VALUES], rem) {
431 if (!blobmsg_name(attr)[0])
434 data = avl_find_element(&ses->data, blobmsg_name(attr), data, avl);
436 avl_delete(&ses->data, &data->avl);
440 data = calloc(1, sizeof(*data) + blob_pad_len(attr));
444 memcpy(data->attr, attr, blob_pad_len(attr));
445 data->avl.key = blobmsg_name(data->attr);
446 avl_insert(&ses->data, &data->avl);
453 uh_ubus_handle_get(struct ubus_context *ctx, struct ubus_object *obj,
454 struct ubus_request_data *req, const char *method,
455 struct blob_attr *msg)
457 struct uh_ubus_session *ses;
458 struct uh_ubus_session_data *data;
459 struct blob_attr *tb[__UH_UBUS_SA_MAX];
460 struct blob_attr *attr;
464 blobmsg_parse(get_policy, __UH_UBUS_SG_MAX, tb, blob_data(msg), blob_len(msg));
466 if (!tb[UH_UBUS_SG_SID])
467 return UBUS_STATUS_INVALID_ARGUMENT;
469 ses = uh_ubus_session_get(blobmsg_data(tb[UH_UBUS_SG_SID]));
471 return UBUS_STATUS_NOT_FOUND;
473 blob_buf_init(&buf, 0);
474 c = blobmsg_open_table(&buf, "values");
476 if (!tb[UH_UBUS_SG_KEYS]) {
477 uh_ubus_session_dump_data(ses, &buf);
481 blobmsg_for_each_attr(attr, tb[UH_UBUS_SG_KEYS], rem) {
482 if (blob_id(attr) != BLOBMSG_TYPE_STRING)
485 data = avl_find_element(&ses->data, blobmsg_data(attr), data, avl);
489 blobmsg_add_field(&buf, blobmsg_type(data->attr),
490 blobmsg_name(data->attr),
491 blobmsg_data(data->attr),
492 blobmsg_data_len(data->attr));
495 blobmsg_close_table(&buf, c);
496 ubus_send_reply(ctx, req, buf.head);
502 uh_ubus_handle_unset(struct ubus_context *ctx, struct ubus_object *obj,
503 struct ubus_request_data *req, const char *method,
504 struct blob_attr *msg)
506 struct uh_ubus_session *ses;
507 struct uh_ubus_session_data *data, *ndata;
508 struct blob_attr *tb[__UH_UBUS_SA_MAX];
509 struct blob_attr *attr;
512 blobmsg_parse(get_policy, __UH_UBUS_SG_MAX, tb, blob_data(msg), blob_len(msg));
514 if (!tb[UH_UBUS_SG_SID])
515 return UBUS_STATUS_INVALID_ARGUMENT;
517 ses = uh_ubus_session_get(blobmsg_data(tb[UH_UBUS_SG_SID]));
519 return UBUS_STATUS_NOT_FOUND;
521 if (!tb[UH_UBUS_SG_KEYS]) {
522 avl_remove_all_elements(&ses->data, data, avl, ndata)
527 blobmsg_for_each_attr(attr, tb[UH_UBUS_SG_KEYS], rem) {
528 if (blob_id(attr) != BLOBMSG_TYPE_STRING)
531 data = avl_find_element(&ses->data, blobmsg_data(attr), data, avl);
535 avl_delete(&ses->data, &data->avl);
543 uh_ubus_handle_destroy(struct ubus_context *ctx, struct ubus_object *obj,
544 struct ubus_request_data *req, const char *method,
545 struct blob_attr *msg)
547 struct uh_ubus_session *ses;
548 struct blob_attr *tb;
550 blobmsg_parse(&sid_policy, 1, &tb, blob_data(msg), blob_len(msg));
553 return UBUS_STATUS_INVALID_ARGUMENT;
555 ses = uh_ubus_session_get(blobmsg_data(tb));
557 return UBUS_STATUS_NOT_FOUND;
559 uh_ubus_session_destroy(ses);
564 bool uh_ubus_session_acl_allowed(struct uh_ubus_session *ses, const char *obj, const char *fun)
566 struct uh_ubus_session_acl *acl;
568 uh_foreach_matching_acl(acl, ses, obj, fun)
574 int ubus_session_api_init(struct ubus_context *ctx)
576 static const struct ubus_method session_methods[] = {
577 UBUS_METHOD("create", uh_ubus_handle_create, &new_policy),
578 UBUS_METHOD("list", uh_ubus_handle_list, &sid_policy),
579 UBUS_METHOD("grant", uh_ubus_handle_acl, acl_policy),
580 UBUS_METHOD("revoke", uh_ubus_handle_acl, acl_policy),
581 UBUS_METHOD("set", uh_ubus_handle_set, set_policy),
582 UBUS_METHOD("get", uh_ubus_handle_get, get_policy),
583 UBUS_METHOD("unset", uh_ubus_handle_unset, get_policy),
584 UBUS_METHOD("destroy", uh_ubus_handle_destroy, &sid_policy),
587 static struct ubus_object_type session_type =
588 UBUS_OBJECT_TYPE("uhttpd", session_methods);
590 static struct ubus_object obj = {
592 .type = &session_type,
593 .methods = session_methods,
594 .n_methods = ARRAY_SIZE(session_methods),
597 avl_init(&sessions, avl_strcmp, false, NULL);
599 return ubus_add_object(ctx, &obj);