www.tinc-vpn.org Git - tinc/blob - 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->buflen = 0;
  77         c->reqlen = 0;
  78         c->tcplen = 0;
  79         c->allow_request = 0;
  80         c->outbuflen = 0;
  81         c->outbufsize = 0;
  82         c->outbufstart = 0;
  83
  84         if(c->inctx) {
  85                 EVP_CIPHER_CTX_cleanup(c->inctx);
  86                 free(c->inctx);
  87                 c->inctx = NULL;
  88         }
  89
  90         if(c->outctx) {
  91                 EVP_CIPHER_CTX_cleanup(c->outctx);
  92                 free(c->outctx);
  93                 c->outctx = NULL;
  94         }
  95
  96         if(c->rsa_key) {
  97                 RSA_free(c->rsa_key);
  98                 c->rsa_key = NULL;
  99         }
 100 }
 101
 102 void free_connection(connection_t *c) {
 103         free_connection_partially(c);
 104
 105         free(c->name);
 106         free(c->hostname);
 107
 108         if(c->config_tree)
 109                 exit_configuration(&c->config_tree);
 110
 111         free(c);
 112 }
 113
 114 void connection_add(connection_t *c) {
 115         avl_insert(connection_tree, c);
 116 }
 117
 118 void connection_del(connection_t *c) {
 119         avl_delete(connection_tree, c);
 120 }
 121
 122 void dump_connections(void) {
 123         avl_node_t *node;
 124         connection_t *c;
 125
 126         logger(LOG_DEBUG, "Connections:");
 127
 128         for(node = connection_tree->head; node; node = node->next) {
 129                 c = node->data;
 130                 logger(LOG_DEBUG, " %s at %s options %x socket %d status %04x outbuf %d/%d/%d",
 131                            c->name, c->hostname, c->options, c->socket, bitfield_to_int(&c->status, sizeof c->status),
 132                            c->outbufsize, c->outbufstart, c->outbuflen);
 133         }
 134
 135         logger(LOG_DEBUG, "End of connections.");
 136 }