git.meshlink.io Git - meshlink/blob - src/edge.c

   1 /*
   2     edge.c -- edge tree management
   3     Copyright (C) 2000-2006 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
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19
  20     $Id$
  21 */
  22
  23 #include "system.h"
  24
  25 #include "avl_tree.h"
  26 #include "edge.h"
  27 #include "logger.h"
  28 #include "netutl.h"
  29 #include "node.h"
  30 #include "utils.h"
  31 #include "xalloc.h"
  32
  33 avl_tree_t *edge_weight_tree;   /* Tree with all edges, sorted on weight */
  34
  35 static int edge_compare(const edge_t *a, const edge_t *b)
  36 {
  37         return strcmp(a->to->name, b->to->name);
  38 }
  39
  40 static int edge_weight_compare(const edge_t *a, const edge_t *b)
  41 {
  42         int result;
  43
  44         result = a->weight - b->weight;
  45
  46         if(result)
  47                 return result;
  48
  49         result = strcmp(a->from->name, b->from->name);
  50
  51         if(result)
  52                 return result;
  53
  54         return strcmp(a->to->name, b->to->name);
  55 }
  56
  57 void init_edges(void)
  58 {
  59         cp();
  60
  61         edge_weight_tree = avl_alloc_tree((avl_compare_t) edge_weight_compare, NULL);
  62 }
  63
  64 avl_tree_t *new_edge_tree(void)
  65 {
  66         cp();
  67
  68         return avl_alloc_tree((avl_compare_t) edge_compare, (avl_action_t) free_edge);
  69 }
  70
  71 void free_edge_tree(avl_tree_t *edge_tree)
  72 {
  73         cp();
  74
  75         avl_delete_tree(edge_tree);
  76 }
  77
  78 void exit_edges(void)
  79 {
  80         cp();
  81
  82         avl_delete_tree(edge_weight_tree);
  83 }
  84
  85 /* Creation and deletion of connection elements */
  86
  87 edge_t *new_edge(void)
  88 {
  89         cp();
  90
  91         return xmalloc_and_zero(sizeof(edge_t));
  92 }
  93
  94 void free_edge(edge_t *e)
  95 {
  96         cp();
  97
  98         sockaddrfree(&e->address);
  99
 100         free(e);
 101 }
 102
 103 void edge_add(edge_t *e)
 104 {
 105         cp();
 106
 107         avl_insert(edge_weight_tree, e);
 108         avl_insert(e->from->edge_tree, e);
 109
 110         e->reverse = lookup_edge(e->to, e->from);
 111
 112         if(e->reverse)
 113                 e->reverse->reverse = e;
 114 }
 115
 116 void edge_del(edge_t *e)
 117 {
 118         cp();
 119
 120         if(e->reverse)
 121                 e->reverse->reverse = NULL;
 122
 123         avl_delete(edge_weight_tree, e);
 124         avl_delete(e->from->edge_tree, e);
 125 }
 126
 127 edge_t *lookup_edge(node_t *from, node_t *to)
 128 {
 129         edge_t v;
 130
 131         cp();
 132
 133         v.from = from;
 134         v.to = to;
 135
 136         return avl_search(from->edge_tree, &v);
 137 }
 138
 139 void dump_edges(void)
 140 {
 141         avl_node_t *node, *node2;
 142         node_t *n;
 143         edge_t *e;
 144         char *address;
 145
 146         cp();
 147
 148         logger(LOG_DEBUG, _("Edges:"));
 149
 150         for(node = node_tree->head; node; node = node->next) {
 151                 n = node->data;
 152                 for(node2 = n->edge_tree->head; node2; node2 = node2->next) {
 153                         e = node2->data;
 154                         address = sockaddr2hostname(&e->address);
 155                         logger(LOG_DEBUG, _(" %s to %s at %s options %lx weight %d"),
 156                                    e->from->name, e->to->name, address, e->options, e->weight);
 157                         free(address);
 158                 }
 159         }
 160
 161         logger(LOG_DEBUG, _("End of edges."));
 162 }