Check RAND_bytes() return value, fail when getting random fails.
[tinc] / src / connection.c
1 /*
2     connection.c -- connection list management
3     Copyright (C) 2000-2012 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 "avl_tree.h"
25 #include "conf.h"
26 #include "logger.h"
27 #include "subnet.h"
28 #include "utils.h"
29 #include "xalloc.h"
30
31 avl_tree_t *connection_tree;    /* Meta connections */
32 connection_t *everyone;
33
34 static int connection_compare(const connection_t *a, const connection_t *b) {
35         return a < b ? -1 : a == b ? 0 : 1;
36 }
37
38 void init_connections(void) {
39         connection_tree = avl_alloc_tree((avl_compare_t) connection_compare, (avl_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         avl_delete_tree(connection_tree);
47         free_connection(everyone);
48 }
49
50 connection_t *new_connection(void) {
51         connection_t *c;
52
53         c = xmalloc_and_zero(sizeof(connection_t));
54
55         if(!c)
56                 return NULL;
57
58         gettimeofday(&c->start, NULL);
59
60         return c;
61 }
62
63 void free_connection_partially(connection_t *c) {
64         free(c->inkey);
65         free(c->outkey);
66         free(c->mychallenge);
67         free(c->hischallenge);
68         free(c->outbuf);
69
70         c->inkey = NULL;
71         c->outkey = NULL;
72         c->mychallenge = NULL;
73         c->hischallenge = NULL;
74         c->outbuf = NULL;
75
76         c->status.pinged = false;
77         c->status.active = false;
78         c->status.connecting = false;
79         c->status.timeout = false;
80         c->status.encryptout = false;
81         c->status.decryptin = false;
82         c->status.mst = false;
83
84         c->options = 0;
85         c->buflen = 0;
86         c->reqlen = 0;
87         c->tcplen = 0;
88         c->allow_request = 0;
89         c->outbuflen = 0;
90         c->outbufsize = 0;
91         c->outbufstart = 0;
92         c->last_ping_time = 0;
93         c->last_flushed_time = 0;
94
95         if(c->inctx) {
96                 EVP_CIPHER_CTX_cleanup(c->inctx);
97                 free(c->inctx);
98                 c->inctx = NULL;
99         }
100
101         if(c->outctx) {
102                 EVP_CIPHER_CTX_cleanup(c->outctx);
103                 free(c->outctx);
104                 c->outctx = NULL;
105         }
106
107         if(c->rsa_key) {
108                 RSA_free(c->rsa_key);
109                 c->rsa_key = NULL;
110         }
111 }
112
113 void free_connection(connection_t *c) {
114         free_connection_partially(c);
115
116         free(c->name);
117         free(c->hostname);
118
119         if(c->config_tree)
120                 exit_configuration(&c->config_tree);
121
122         free(c);
123 }
124
125 void connection_add(connection_t *c) {
126         avl_insert(connection_tree, c);
127 }
128
129 void connection_del(connection_t *c) {
130         avl_delete(connection_tree, c);
131 }
132
133 void dump_connections(void) {
134         avl_node_t *node;
135         connection_t *c;
136
137         logger(LOG_DEBUG, "Connections:");
138
139         for(node = connection_tree->head; node; node = node->next) {
140                 c = node->data;
141                 logger(LOG_DEBUG, " %s at %s options %x socket %d status %04x outbuf %d/%d/%d",
142                            c->name, c->hostname, c->options, c->socket, bitfield_to_int(&c->status, sizeof c->status),
143                            c->outbufsize, c->outbufstart, c->outbuflen);
144         }
145
146         logger(LOG_DEBUG, "End of connections.");
147 }