src/connection.c

   1 /*
   2     connection.c -- connection list management
   3     Copyright (C) 2000-2016 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         c->inbudget = 0;
  95         c->outbudget = 0;
  96
  97         if(c->inctx) {
  98                 EVP_CIPHER_CTX_cleanup(c->inctx);
  99                 free(c->inctx);
 100                 c->inctx = NULL;
 101         }
 102
 103         if(c->outctx) {
 104                 EVP_CIPHER_CTX_cleanup(c->outctx);
 105                 free(c->outctx);
 106                 c->outctx = NULL;
 107         }
 108
 109         if(c->rsa_key) {
 110                 RSA_free(c->rsa_key);
 111                 c->rsa_key = NULL;
 112         }
 113 }
 114
 115 void free_connection(connection_t *c) {
 116         free_connection_partially(c);
 117
 118         free(c->name);
 119         free(c->hostname);
 120
 121         if(c->config_tree)
 122                 exit_configuration(&c->config_tree);
 123
 124         free(c);
 125 }
 126
 127 void connection_add(connection_t *c) {
 128         avl_insert(connection_tree, c);
 129 }
 130
 131 void connection_del(connection_t *c) {
 132         avl_delete(connection_tree, c);
 133 }
 134
 135 void dump_connections(void) {
 136         avl_node_t *node;
 137         connection_t *c;
 138
 139         logger(LOG_DEBUG, "Connections:");
 140
 141         for(node = connection_tree->head; node; node = node->next) {
 142                 c = node->data;
 143                 logger(LOG_DEBUG, " %s at %s options %x socket %d status %04x outbuf %d/%d/%d",
 144                            c->name, c->hostname, c->options, c->socket, bitfield_to_int(&c->status, sizeof c->status),
 145                            c->outbufsize, c->outbufstart, c->outbuflen);
 146         }
 147
 148         logger(LOG_DEBUG, "End of connections.");
 149 }