www.tinc-vpn.org Git - tinc/blob - src/edge.c

   1 /*
   2     edge.c -- edge tree management
   3     Copyright (C) 2000-2021 Guus Sliepen <guus@tinc-vpn.org>,
   4                   2000-2005 Ivo Timmermans
   5
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License along
  17     with this program; if not, write to the Free Software Foundation, Inc.,
  18     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19 */
  20
  21 #include "system.h"
  22
  23 #include "splay_tree.h"
  24 #include "control_common.h"
  25 #include "edge.h"
  26 #include "logger.h"
  27 #include "netutl.h"
  28 #include "node.h"
  29 #include "utils.h"
  30 #include "xalloc.h"
  31
  32 splay_tree_t *edge_weight_tree;
  33
  34 static int edge_compare(const edge_t *a, const edge_t *b) {
  35         return strcmp(a->to->name, b->to->name);
  36 }
  37
  38 static int edge_weight_compare(const edge_t *a, const edge_t *b) {
  39         int result;
  40
  41         result = a->weight - b->weight;
  42
  43         if(result) {
  44                 return result;
  45         }
  46
  47         result = strcmp(a->from->name, b->from->name);
  48
  49         if(result) {
  50                 return result;
  51         }
  52
  53         return strcmp(a->to->name, b->to->name);
  54 }
  55
  56 void init_edges(void) {
  57         edge_weight_tree = splay_alloc_tree((splay_compare_t) edge_weight_compare, NULL);
  58 }
  59
  60 splay_tree_t *new_edge_tree(void) {
  61         return splay_alloc_tree((splay_compare_t) edge_compare, (splay_action_t) free_edge);
  62 }
  63
  64 void free_edge_tree(splay_tree_t *edge_tree) {
  65         splay_delete_tree(edge_tree);
  66 }
  67
  68 void exit_edges(void) {
  69         splay_delete_tree(edge_weight_tree);
  70 }
  71
  72 /* Creation and deletion of connection elements */
  73
  74 edge_t *new_edge(void) {
  75         return xzalloc(sizeof(edge_t));
  76 }
  77
  78 void free_edge(edge_t *e) {
  79         sockaddrfree(&e->address);
  80         sockaddrfree(&e->local_address);
  81
  82         free(e);
  83 }
  84
  85 void edge_add(edge_t *e) {
  86         splay_node_t *node = splay_insert(e->from->edge_tree, e);
  87
  88         if(!node) {
  89                 logger(DEBUG_ALWAYS, LOG_ERR, "Edge from %s to %s already exists in edge_tree\n", e->from->name, e->to->name);
  90                 return;
  91         }
  92
  93
  94         e->reverse = lookup_edge(e->to, e->from);
  95
  96         if(e->reverse) {
  97                 e->reverse->reverse = e;
  98         }
  99
 100         node = splay_insert(edge_weight_tree, e);
 101
 102         if(!node) {
 103                 logger(DEBUG_ALWAYS, LOG_ERR, "Edge from %s to %s already exists in edge_weight_tree\n", e->from->name, e->to->name);
 104                 return;
 105         }
 106 }
 107
 108 void edge_del(edge_t *e) {
 109         if(e->reverse) {
 110                 e->reverse->reverse = NULL;
 111         }
 112
 113         splay_delete(edge_weight_tree, e);
 114         splay_delete(e->from->edge_tree, e);
 115 }
 116
 117 edge_t *lookup_edge(node_t *from, node_t *to) {
 118         edge_t v;
 119
 120         v.from = from;
 121         v.to = to;
 122
 123         return splay_search(from->edge_tree, &v);
 124 }
 125
 126 bool dump_edges(connection_t *c) {
 127         for splay_each(node_t, n, node_tree) {
 128                 for splay_each(edge_t, e, n->edge_tree) {
 129                         char *address = sockaddr2hostname(&e->address);
 130                         char *local_address = sockaddr2hostname(&e->local_address);
 131                         send_request(c, "%d %d %s %s %s %s %x %d",
 132                                      CONTROL, REQ_DUMP_EDGES,
 133                                      e->from->name, e->to->name, address,
 134                                      local_address, e->options, e->weight);
 135                         free(address);
 136                         free(local_address);
 137                 }
 138         }
 139
 140         return send_request(c, "%d %d", CONTROL, REQ_DUMP_EDGES);
 141 }