minor
[tinc] / src / subnet.c
1 /*
2     subnet.c -- handle subnet lookups and lists
3     Copyright (C) 2000-2017 Guus Sliepen <guus@tinc-vpn.org>,
4                   2000-2005 Ivo Timmermans
5
6     This program is free software; you can redistribute it and/or modify
7     it under the terms of the GNU General Public License as published by
8     the Free Software Foundation; either version 2 of the License, or
9     (at your option) any later version.
10
11     This program is distributed in the hope that it will be useful,
12     but WITHOUT ANY WARRANTY; without even the implied warranty of
13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14     GNU General Public License for more details.
15
16     You should have received a copy of the GNU General Public License along
17     with this program; if not, write to the Free Software Foundation, Inc.,
18     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19 */
20
21 #include "system.h"
22
23 #include "splay_tree.h"
24 #include "control_common.h"
25 #include "device.h"
26 #include "hash.h"
27 #include "logger.h"
28 #include "names.h"
29 #include "net.h"
30 #include "netutl.h"
31 #include "node.h"
32 #include "script.h"
33 #include "subnet.h"
34 #include "utils.h"
35 #include "xalloc.h"
36
37 /* lists type of subnet */
38
39 splay_tree_t *subnet_tree;
40
41 /* Subnet lookup cache */
42
43 static hash_t *ipv4_cache;
44 static hash_t *ipv6_cache;
45 static hash_t *mac_cache;
46
47 void subnet_cache_flush(void) {
48         hash_clear(ipv4_cache);
49         hash_clear(ipv6_cache);
50         hash_clear(mac_cache);
51 }
52
53 /* Initialising trees */
54
55 void init_subnets(void) {
56         subnet_tree = splay_alloc_tree((splay_compare_t) subnet_compare, (splay_action_t) free_subnet);
57
58         ipv4_cache = hash_alloc(0x100, sizeof(ipv4_t));
59         ipv6_cache = hash_alloc(0x100, sizeof(ipv6_t));
60         mac_cache = hash_alloc(0x100, sizeof(mac_t));
61 }
62
63 void exit_subnets(void) {
64         splay_delete_tree(subnet_tree);
65
66         hash_free(ipv4_cache);
67         hash_free(ipv6_cache);
68         hash_free(mac_cache);
69 }
70
71 splay_tree_t *new_subnet_tree(void) {
72         return splay_alloc_tree((splay_compare_t) subnet_compare, NULL);
73 }
74
75 void free_subnet_tree(splay_tree_t *subnet_tree) {
76         splay_delete_tree(subnet_tree);
77 }
78
79 /* Allocating and freeing space for subnets */
80
81 subnet_t *new_subnet(void) {
82         return xzalloc(sizeof(subnet_t));
83 }
84
85 void free_subnet(subnet_t *subnet) {
86         free(subnet);
87 }
88
89 /* Adding and removing subnets */
90
91 void subnet_add(node_t *n, subnet_t *subnet) {
92         subnet->owner = n;
93
94         splay_insert(subnet_tree, subnet);
95
96         if(n) {
97                 splay_insert(n->subnet_tree, subnet);
98         }
99
100         subnet_cache_flush();
101 }
102
103 void subnet_del(node_t *n, subnet_t *subnet) {
104         if(n) {
105                 splay_delete(n->subnet_tree, subnet);
106         }
107
108         splay_delete(subnet_tree, subnet);
109
110         subnet_cache_flush();
111 }
112
113 /* Subnet lookup routines */
114
115 subnet_t *lookup_subnet(const node_t *owner, const subnet_t *subnet) {
116         return splay_search(owner->subnet_tree, subnet);
117 }
118
119 subnet_t *lookup_subnet_mac(const node_t *owner, const mac_t *address) {
120         subnet_t *r = NULL;
121
122         // Check if this address is cached
123
124         if((r = hash_search(mac_cache, address))) {
125                 return r;
126         }
127
128         // Search all subnets for a matching one
129
130         for splay_each(subnet_t, p, owner ? owner->subnet_tree : subnet_tree) {
131                 if(!p || p->type != SUBNET_MAC) {
132                         continue;
133                 }
134
135                 if(!memcmp(address, &p->net.mac.address, sizeof(*address))) {
136                         r = p;
137
138                         if(!p->owner || p->owner->status.reachable) {
139                                 break;
140                         }
141                 }
142         }
143
144         // Cache the result
145
146         if(r) {
147                 hash_insert(mac_cache, address, r);
148         }
149
150         return r;
151 }
152
153 subnet_t *lookup_subnet_ipv4(const ipv4_t *address) {
154         subnet_t *r = NULL;
155
156         // Check if this address is cached
157
158         if((r = hash_search(ipv4_cache, address))) {
159                 return r;
160         }
161
162         // Search all subnets for a matching one
163
164         for splay_each(subnet_t, p, subnet_tree) {
165                 if(!p || p->type != SUBNET_IPV4) {
166                         continue;
167                 }
168
169                 if(!maskcmp(address, &p->net.ipv4.address, p->net.ipv4.prefixlength)) {
170                         r = p;
171
172                         if(!p->owner || p->owner->status.reachable) {
173                                 break;
174                         }
175                 }
176         }
177
178         // Cache the result
179
180         if(r) {
181                 hash_insert(ipv4_cache, address, r);
182         }
183
184         return r;
185 }
186
187 subnet_t *lookup_subnet_ipv6(const ipv6_t *address) {
188         subnet_t *r = NULL;
189
190         // Check if this address is cached
191
192         if((r = hash_search(ipv6_cache, address))) {
193                 return r;
194         }
195
196         // Search all subnets for a matching one
197
198         for splay_each(subnet_t, p, subnet_tree) {
199                 if(!p || p->type != SUBNET_IPV6) {
200                         continue;
201                 }
202
203                 if(!maskcmp(address, &p->net.ipv6.address, p->net.ipv6.prefixlength)) {
204                         r = p;
205
206                         if(!p->owner || p->owner->status.reachable) {
207                                 break;
208                         }
209                 }
210         }
211
212         // Cache the result
213
214         if(r) {
215                 hash_insert(ipv6_cache, address, r);
216         }
217
218         return r;
219 }
220
221 void subnet_update(node_t *owner, subnet_t *subnet, bool up) {
222         char netstr[MAXNETSTR];
223         char *name, *address, *port;
224         char empty[] = "";
225
226         // Prepare environment variables to be passed to the script
227
228         environment_t env;
229         environment_init(&env);
230         environment_add(&env, "NODE=%s", owner->name);
231
232         if(owner != myself) {
233                 sockaddr2str(&owner->address, &address, &port);
234                 environment_add(&env, "REMOTEADDRESS=%s", address);
235                 environment_add(&env, "REMOTEPORT=%s", port);
236                 free(port);
237                 free(address);
238         }
239
240         int env_subnet = environment_add(&env, NULL);
241         int env_weight = environment_add(&env, NULL);
242
243         name = up ? "subnet-up" : "subnet-down";
244
245         if(!subnet) {
246                 for splay_each(subnet_t, subnet, owner->subnet_tree) {
247                         if(!net2str(netstr, sizeof(netstr), subnet)) {
248                                 continue;
249                         }
250
251                         // Strip the weight from the subnet, and put it in its own environment variable
252                         char *weight = strchr(netstr, '#');
253
254                         if(weight) {
255                                 *weight++ = 0;
256                         } else {
257                                 weight = empty;
258                         }
259
260                         // Prepare the SUBNET and WEIGHT variables
261                         environment_update(&env, env_subnet, "SUBNET=%s", netstr);
262                         environment_update(&env, env_weight, "WEIGHT=%s", weight);
263
264                         execute_script(name, &env);
265                 }
266         } else {
267                 if(net2str(netstr, sizeof(netstr), subnet)) {
268                         // Strip the weight from the subnet, and put it in its own environment variable
269                         char *weight = strchr(netstr, '#');
270
271                         if(weight) {
272                                 *weight++ = 0;
273                         } else {
274                                 weight = empty;
275                         }
276
277                         // Prepare the SUBNET and WEIGHT variables
278                         environment_update(&env, env_subnet, "SUBNET=%s", netstr);
279                         environment_update(&env, env_weight, "WEIGHT=%s", weight);
280
281                         execute_script(name, &env);
282                 }
283         }
284
285         environment_exit(&env);
286 }
287
288 bool dump_subnets(connection_t *c) {
289         for splay_each(subnet_t, subnet, subnet_tree) {
290                 char netstr[MAXNETSTR];
291
292                 if(!net2str(netstr, sizeof(netstr), subnet)) {
293                         continue;
294                 }
295
296                 send_request(c, "%d %d %s %s",
297                              CONTROL, REQ_DUMP_SUBNETS,
298                              netstr, subnet->owner ? subnet->owner->name : "(broadcast)");
299         }
300
301         return send_request(c, "%d %d", CONTROL, REQ_DUMP_SUBNETS);
302 }