Don't send MTU probes smaller than 512 bytes.
[tinc] / src / connection.c
1 /*
2     connection.c -- connection list management
3     Copyright (C) 2000-2013 Guus Sliepen <guus@tinc-vpn.org>,
4                   2000-2005 Ivo Timmermans
5                   2008      Max Rijevski <maksuf@gmail.com>
6
7     This program is free software; you can redistribute it and/or modify
8     it under the terms of the GNU General Public License as published by
9     the Free Software Foundation; either version 2 of the License, or
10     (at your option) any later version.
11
12     This program is distributed in the hope that it will be useful,
13     but WITHOUT ANY WARRANTY; without even the implied warranty of
14     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15     GNU General Public License for more details.
16
17     You should have received a copy of the GNU General Public License along
18     with this program; if not, write to the Free Software Foundation, Inc.,
19     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
20 */
21
22 #include "system.h"
23
24 #include "list.h"
25 #include "cipher.h"
26 #include "conf.h"
27 #include "control_common.h"
28 #include "list.h"
29 #include "logger.h"
30 #include "rsa.h"
31 #include "subnet.h"
32 #include "utils.h"
33 #include "xalloc.h"
34
35 list_t *connection_list;
36 connection_t *everyone;
37
38 void init_connections(void) {
39         connection_list = list_alloc((list_action_t) free_connection);
40         everyone = new_connection();
41         everyone->name = xstrdup("everyone");
42         everyone->hostname = xstrdup("BROADCAST");
43 }
44
45 void exit_connections(void) {
46         list_delete_list(connection_list);
47         free_connection(everyone);
48 }
49
50 connection_t *new_connection(void) {
51         return xzalloc(sizeof(connection_t));
52 }
53
54 void free_connection(connection_t *c) {
55         if(!c)
56                 return;
57
58 #ifndef DISABLE_LEGACY
59         cipher_close(c->incipher);
60         digest_close(c->indigest);
61         cipher_close(c->outcipher);
62         digest_close(c->outdigest);
63         rsa_free(c->rsa);
64 #endif
65
66         sptps_stop(&c->sptps);
67         ecdsa_free(c->ecdsa);
68
69         free(c->hischallenge);
70
71         buffer_clear(&c->inbuf);
72         buffer_clear(&c->outbuf);
73
74         io_del(&c->io);
75
76         if(c->socket > 0)
77                 closesocket(c->socket);
78
79         free(c->name);
80         free(c->hostname);
81
82         if(c->config_tree)
83                 exit_configuration(&c->config_tree);
84
85         free(c);
86 }
87
88 void connection_add(connection_t *c) {
89         list_insert_tail(connection_list, c);
90 }
91
92 void connection_del(connection_t *c) {
93         list_delete(connection_list, c);
94 }
95
96 bool dump_connections(connection_t *cdump) {
97         for list_each(connection_t, c, connection_list) {
98                 send_request(cdump, "%d %d %s %s %x %d %x",
99                                 CONTROL, REQ_DUMP_CONNECTIONS,
100                                 c->name, c->hostname, c->options, c->socket,
101                                 bitfield_to_int(&c->status, sizeof c->status));
102         }
103
104         return send_request(cdump, "%d %d", CONTROL, REQ_DUMP_CONNECTIONS);
105 }