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

   1 /*
   2     edge.c -- edge tree management
   3     Copyright (C) 2000-2003 Guus Sliepen <guus@sliepen.eu.org>,
   4                   2000-2003 Ivo Timmermans <ivo@o2w.nl>
   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: edge.c,v 1.1.2.23 2003/07/24 12:08:15 guus Exp $
  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 =
  62                 avl_alloc_tree((avl_compare_t) edge_weight_compare, NULL);
  63 }
  64
  65 avl_tree_t *new_edge_tree(void)
  66 {
  67         cp();
  68
  69         return avl_alloc_tree((avl_compare_t) edge_compare, NULL);
  70 }
  71
  72 void free_edge_tree(avl_tree_t *edge_tree)
  73 {
  74         cp();
  75
  76         avl_delete_tree(edge_tree);
  77 }
  78
  79 void exit_edges(void)
  80 {
  81         cp();
  82
  83         avl_delete_tree(edge_weight_tree);
  84 }
  85
  86 /* Creation and deletion of connection elements */
  87
  88 edge_t *new_edge(void)
  89 {
  90         cp();
  91
  92         return (edge_t *) xmalloc_and_zero(sizeof(edge_t));
  93 }
  94
  95 void free_edge(edge_t *e)
  96 {
  97         cp();
  98
  99         free(e);
 100 }
 101
 102 void edge_add(edge_t *e)
 103 {
 104         cp();
 105
 106         avl_insert(edge_weight_tree, e);
 107         avl_insert(e->from->edge_tree, e);
 108
 109         e->reverse = lookup_edge(e->to, e->from);
 110
 111         if(e->reverse)
 112                 e->reverse->reverse = e;
 113 }
 114
 115 void edge_del(edge_t *e)
 116 {
 117         cp();
 118
 119         if(e->reverse)
 120                 e->reverse->reverse = NULL;
 121
 122         avl_delete(e->from->edge_tree, e);
 123         avl_delete(edge_weight_tree, e);
 124 }
 125
 126 edge_t *lookup_edge(const node_t *from, const node_t *to)
 127 {
 128         edge_t v = {
 129                 .from = from,
 130                 .to = to
 131         };
 132
 133         cp();
 134
 135         return avl_search(from->edge_tree, &v);
 136 }
 137
 138 void dump_edges(void)
 139 {
 140         avl_node_t *node, *node2;
 141         node_t *n;
 142         edge_t *e;
 143         char *address;
 144
 145         cp();
 146
 147         logger(LOG_DEBUG, _("Edges:"));
 148
 149         for(node = node_tree->head; node; node = node->next) {
 150                 n = (node_t *) node->data;
 151                 for(node2 = n->edge_tree->head; node2; node2 = node2->next) {
 152                         e = (edge_t *) node2->data;
 153                         address = sockaddr2hostname(&e->address);
 154                         logger(LOG_DEBUG, _(" %s to %s at %s options %lx weight %d"),
 155                                    e->from->name, e->to->name, address, e->options, e->weight);
 156                         free(address);
 157                 }
 158         }
 159
 160         logger(LOG_DEBUG, _("End of edges."));
 161 }