Check correct attributes when loading service from blob
[project/mdnsd.git] / ubus.c
1 /*
2 * Copyright (C) 2014 John Crispin <blogic@openwrt.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU Lesser General Public License version 2.1
6 * as published by the Free Software Foundation
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 */
13
14 #include <sys/types.h>
15 #include <arpa/inet.h>
16
17 #include <stdio.h>
18
19 #include <libubus.h>
20 #include <libubox/vlist.h>
21 #include <libubox/uloop.h>
22
23 #include "util.h"
24 #include "ubus.h"
25 #include "cache.h"
26 #include "service.h"
27 #include "interface.h"
28
29 static struct ubus_auto_conn conn;
30 static struct blob_buf b;
31
32 static int
33 mdns_reload(struct ubus_context *ctx, struct ubus_object *obj,
34 struct ubus_request_data *req, const char *method,
35 struct blob_attr *msg)
36 {
37 service_init(1);
38 return 0;
39 }
40
41 static int
42 mdns_scan(struct ubus_context *ctx, struct ubus_object *obj,
43 struct ubus_request_data *req, const char *method,
44 struct blob_attr *msg)
45 {
46 cache_scan();
47 return 0;
48 }
49
50 static int
51 mdns_browse(struct ubus_context *ctx, struct ubus_object *obj,
52 struct ubus_request_data *req, const char *method,
53 struct blob_attr *msg)
54 {
55 struct cache_service *s, *q;
56 char *buffer = (char *) mdns_buf;
57 void *c1 = NULL, *c2;
58
59 blob_buf_init(&b, 0);
60 avl_for_each_element(&services, s, avl) {
61 char *local;
62 if (*((char *) s->avl.key) != '_')
63 continue;
64 snprintf(buffer, MAX_NAME_LEN, "%s", (const char *) s->avl.key);
65 local = strstr(buffer, ".local");
66 if (local)
67 *local = '\0';
68 if (!strcmp(buffer, "_tcp") || !strcmp(buffer, "_udp"))
69 continue;
70
71 if (!c1) {
72 c1 = blobmsg_open_table(&b, buffer);
73 }
74 snprintf(buffer, MAX_NAME_LEN, "%s", (const char *) s->entry);
75 local = strstr(buffer, "._");
76 if (local)
77 *local = '\0';
78 c2 = blobmsg_open_table(&b, buffer);
79 strncat(buffer, ".local", MAX_NAME_LEN);
80 cache_dump_records(&b, buffer);
81 cache_dump_records(&b, s->entry);
82 blobmsg_close_table(&b, c2);
83 q = avl_next_element(s, avl);
84 if (!q || avl_is_last(&services, &s->avl) || strcmp(s->avl.key, q->avl.key)) {
85 blobmsg_close_table(&b, c1);
86 c1 = NULL;
87 }
88 }
89 ubus_send_reply(ctx, req, b.head);
90
91 return UBUS_STATUS_OK;
92 }
93
94 static int
95 mdns_hosts(struct ubus_context *ctx, struct ubus_object *obj,
96 struct ubus_request_data *req, const char *method,
97 struct blob_attr *msg)
98 {
99 struct cache_service *s;
100 char *buffer = (char *) mdns_buf;
101 void *c;
102
103 blob_buf_init(&b, 0);
104 avl_for_each_element(&services, s, avl) {
105 char *local;
106 if (*((char *) s->avl.key) == '_')
107 continue;
108 snprintf(buffer, MAX_NAME_LEN, "%s", (const char *) s->entry);
109 local = strstr(buffer, "._");
110 if (local)
111 *local = '\0';
112 c = blobmsg_open_table(&b, buffer);
113 strncat(buffer, ".local", MAX_NAME_LEN);
114 cache_dump_records(&b, buffer);
115 cache_dump_records(&b, s->entry);
116 blobmsg_close_table(&b, c);
117 }
118 ubus_send_reply(ctx, req, b.head);
119
120 return UBUS_STATUS_OK;
121 }
122
123 enum {
124 CFG_INTERFACES,
125 CFG_KEEP,
126 CFG_MAX
127 };
128
129 static const struct blobmsg_policy config_policy[] = {
130 [CFG_INTERFACES] = { "interfaces", BLOBMSG_TYPE_ARRAY },
131 [CFG_KEEP] = { "keep", BLOBMSG_TYPE_BOOL },
132 };
133
134 static int
135 mdns_set_config(struct ubus_context *ctx, struct ubus_object *obj,
136 struct ubus_request_data *req, const char *method,
137 struct blob_attr *msg)
138 {
139 struct blob_attr *data[CFG_MAX], *cur;
140 int rem, keep = false;
141
142 blobmsg_parse(config_policy, CFG_MAX, data, blob_data(msg), blob_len(msg));
143 if (!data[CFG_INTERFACES])
144 return UBUS_STATUS_INVALID_ARGUMENT;
145
146 if (!blobmsg_check_attr_list(data[CFG_INTERFACES], BLOBMSG_TYPE_STRING))
147 return UBUS_STATUS_INVALID_ARGUMENT;
148
149 keep = data[CFG_KEEP] && blobmsg_get_bool(data[CFG_KEEP]);
150 if (!keep) {
151 vlist_update(&interfaces);
152 ubus_notify(ctx, obj, "set_config", NULL, 1000);
153 }
154
155 blobmsg_for_each_attr(cur, data[CFG_INTERFACES], rem)
156 interface_add(blobmsg_data(cur));
157
158 if (!keep)
159 vlist_flush(&interfaces);
160
161 return 0;
162 }
163
164 enum query_attr {
165 QUERY_QUESTION,
166 QUERY_IFACE,
167 QUERY_TYPE,
168 QUERY_MAX
169 };
170
171 static const struct blobmsg_policy query_policy[QUERY_MAX] = {
172 [QUERY_QUESTION]= { "question", BLOBMSG_TYPE_STRING },
173 [QUERY_IFACE] = { "interface", BLOBMSG_TYPE_STRING },
174 [QUERY_TYPE] = { "type", BLOBMSG_TYPE_INT32 },
175 };
176
177 static int
178 mdns_query(struct ubus_context *ctx, struct ubus_object *obj,
179 struct ubus_request_data *req, const char *method,
180 struct blob_attr *msg)
181 {
182 struct blob_attr *tb[QUERY_MAX], *c;
183 const char *question = "_services._dns-sd._udp.local";
184 const char *ifname;
185 int type = TYPE_ANY;
186
187 blobmsg_parse(query_policy, QUERY_MAX, tb, blob_data(msg), blob_len(msg));
188
189 if (!(c = tb[QUERY_IFACE]))
190 return UBUS_STATUS_INVALID_ARGUMENT;
191
192 ifname = blobmsg_get_string(c);
193
194 if ((c = tb[QUERY_QUESTION]))
195 question = blobmsg_get_string(c);
196
197 if ((c = tb[QUERY_TYPE]))
198 type = blobmsg_get_u32(c);
199
200 struct interface *iface_v4 = interface_get(ifname, 0, 1);
201 struct interface *iface_v6 = interface_get(ifname, 1, 1);
202
203 if (!iface_v4 && !iface_v6)
204 return UBUS_STATUS_NOT_FOUND;
205
206 if (!strcmp(method, "query")) {
207 if (iface_v4)
208 dns_send_question(iface_v4, question, type, 1);
209
210 if (iface_v6)
211 dns_send_question(iface_v6, question, type, 1);
212
213 return UBUS_STATUS_OK;
214 } else if (!strcmp(method, "fetch")) {
215 blob_buf_init(&b, 0);
216 void *k = blobmsg_open_array(&b, "records");
217 cache_dump_recursive(&b, question, type, iface_v4 ? iface_v4 : iface_v6);
218 blobmsg_close_array(&b, k);
219 ubus_send_reply(ctx, req, b.head);
220 return UBUS_STATUS_OK;
221 } else {
222 return UBUS_STATUS_INVALID_ARGUMENT;
223 }
224 }
225
226
227 static const struct ubus_method mdns_methods[] = {
228 UBUS_METHOD("set_config", mdns_set_config, config_policy),
229 UBUS_METHOD("query", mdns_query, query_policy),
230 UBUS_METHOD("fetch", mdns_query, query_policy),
231 UBUS_METHOD_NOARG("scan", mdns_scan),
232 UBUS_METHOD_NOARG("browse", mdns_browse),
233 UBUS_METHOD_NOARG("hosts", mdns_hosts),
234 UBUS_METHOD_NOARG("reload", mdns_reload),
235 };
236
237 static struct ubus_object_type mdns_object_type =
238 UBUS_OBJECT_TYPE("mdns", mdns_methods);
239
240 static struct ubus_object mdns_object = {
241 .name = "mdns",
242 .type = &mdns_object_type,
243 .methods = mdns_methods,
244 .n_methods = ARRAY_SIZE(mdns_methods),
245 };
246
247 static void
248 ubus_connect_handler(struct ubus_context *ctx)
249 {
250 int ret;
251
252 ret = ubus_add_object(ctx, &mdns_object);
253 if (ret)
254 fprintf(stderr, "Failed to add object: %s\n", ubus_strerror(ret));
255 }
256
257 void
258 ubus_startup(void)
259 {
260 conn.cb = ubus_connect_handler;
261 ubus_auto_connect(&conn);
262 }
263
264 int ubus_service_list(ubus_data_handler_t cb)
265 {
266 uint32_t id;
267 int ret;
268
269 blob_buf_init(&b, 0);
270 ret = ubus_lookup_id(&conn.ctx, "service", &id);
271 if (ret)
272 return ret;
273
274 return ubus_invoke(&conn.ctx, id, "list", b.head, cb, NULL, 5 * 1000);
275 }