git.tinc-vpn.org Git - tinc/blob - 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 "logger.h"
  29 #include "net.h"
  30 #include "rsa.h"
  31 #include "utils.h"
  32 #include "xalloc.h"
  33
  34 list_t connection_list = {
  35         .head = NULL,
  36         .tail = NULL,
  37         .count = 0,
  38         .delete = (list_action_t) free_connection,
  39 };
  40
  41 connection_t *everyone;
  42
  43 void init_connections(void) {
  44         everyone = new_connection();
  45         everyone->name = xstrdup("everyone");
  46         everyone->hostname = xstrdup("BROADCAST");
  47 }
  48
  49 void exit_connections(void) {
  50         list_empty_list(&connection_list);
  51
  52         free_connection(everyone);
  53         everyone = NULL;
  54 }
  55
  56 connection_t *new_connection(void) {
  57         return xzalloc(sizeof(connection_t));
  58 }
  59
  60 #ifndef DISABLE_LEGACY
  61 bool init_crypto_by_nid(legacy_crypto_t *c, nid_t cipher, nid_t digest) {
  62         if(!cipher_open_by_nid(&c->cipher, cipher)) {
  63                 return false;
  64         }
  65
  66         if(!digest_open_by_nid(&c->digest, digest, DIGEST_ALGO_SIZE)) {
  67                 cipher_close(&c->cipher);
  68                 return false;
  69         }
  70
  71         c->budget = cipher_budget(&c->cipher);
  72         return true;
  73 }
  74
  75 bool init_crypto_by_name(legacy_crypto_t *c, const char *cipher, const char *digest) {
  76         if(!cipher_open_by_name(&c->cipher, cipher)) {
  77                 return false;
  78         }
  79
  80         if(!digest_open_by_name(&c->digest, digest, DIGEST_ALGO_SIZE)) {
  81                 cipher_close(&c->cipher);
  82                 return false;
  83         }
  84
  85         c->budget = cipher_budget(&c->cipher);
  86         return true;
  87 }
  88
  89 bool decrease_budget(legacy_crypto_t *c, size_t bytes) {
  90         if(bytes > c->budget) {
  91                 return false;
  92         } else {
  93                 c->budget -= bytes;
  94                 return true;
  95         }
  96 }
  97
  98 static void close_legacy_crypto(legacy_crypto_t *c) {
  99         cipher_close(&c->cipher);
 100         digest_close(&c->digest);
 101 }
 102
 103 legacy_ctx_t *new_legacy_ctx(rsa_t *rsa) {
 104         legacy_ctx_t *ctx = xzalloc(sizeof(legacy_ctx_t));
 105         ctx->rsa = rsa;
 106         return ctx;
 107 }
 108
 109 void free_legacy_ctx(legacy_ctx_t *ctx) {
 110         if(ctx) {
 111                 close_legacy_crypto(&ctx->in);
 112                 close_legacy_crypto(&ctx->out);
 113                 rsa_free(ctx->rsa);
 114                 free(ctx);
 115         }
 116 }
 117 #endif
 118
 119 void free_connection(connection_t *c) {
 120         if(!c) {
 121                 return;
 122         }
 123
 124 #ifndef DISABLE_LEGACY
 125         free_legacy_ctx(c->legacy);
 126 #endif
 127
 128         sptps_stop(&c->sptps);
 129         ecdsa_free(c->ecdsa);
 130
 131         free(c->hischallenge);
 132         free(c->mychallenge);
 133
 134         buffer_clear(&c->inbuf);
 135         buffer_clear(&c->outbuf);
 136
 137         io_del(&c->io);
 138
 139         if(c->socket > 0) {
 140                 if(c->status.tarpit) {
 141                         tarpit(c->socket);
 142                 } else {
 143                         closesocket(c->socket);
 144                 }
 145         }
 146
 147         free(c->name);
 148         free(c->hostname);
 149
 150         if(c->config_tree) {
 151                 exit_configuration(c->config_tree);
 152                 c->config_tree = NULL;
 153         }
 154
 155         free(c);
 156 }
 157
 158 void connection_add(connection_t *c) {
 159         list_insert_tail(&connection_list, c);
 160 }
 161
 162 void connection_del(connection_t *c) {
 163         list_delete(&connection_list, c);
 164 }
 165
 166 bool dump_connections(connection_t *cdump) {
 167         for list_each(connection_t, c, &connection_list) {
 168                 send_request(cdump, "%d %d %s %s %x %d %x",
 169                              CONTROL, REQ_DUMP_CONNECTIONS,
 170                              c->name, c->hostname, c->options, c->socket,
 171                              c->status.value);
 172         }
 173
 174         return send_request(cdump, "%d %d", CONTROL, REQ_DUMP_CONNECTIONS);
 175 }