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

   1 /*
   2     edge.c -- edge tree management
   3     Copyright (C) 2000-2013 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         result = strcmp(a->from->name, b->from->name);
  47
  48         if(result)
  49                 return result;
  50
  51         return strcmp(a->to->name, b->to->name);
  52 }
  53
  54 void init_edges(void) {
  55         edge_weight_tree = splay_alloc_tree((splay_compare_t) edge_weight_compare, NULL);
  56 }
  57
  58 splay_tree_t *new_edge_tree(void) {
  59         return splay_alloc_tree((splay_compare_t) edge_compare, (splay_action_t) free_edge);
  60 }
  61
  62 void free_edge_tree(splay_tree_t *edge_tree) {
  63         splay_delete_tree(edge_tree);
  64 }
  65
  66 void exit_edges(void) {
  67         // since edge_weight_tree does not have delete action defined
  68         // we have to cleanup it on exit
  69         for splay_each(edge_t, e, edge_weight_tree) {
  70                         sockaddrfree(&e->address);
  71                         sockaddrfree(&e->local_address);
  72                 }
  73         splay_delete_tree(edge_weight_tree);
  74 }
  75
  76 /* Creation and deletion of connection elements */
  77
  78 edge_t *new_edge(void) {
  79         return xzalloc(sizeof(edge_t));
  80 }
  81
  82 void free_edge(edge_t *e) {
  83         sockaddrfree(&e->address);
  84
  85         free(e);
  86 }
  87
  88 void edge_add(edge_t *e) {
  89         splay_insert(edge_weight_tree, e);
  90         splay_insert(e->from->edge_tree, e);
  91
  92         e->reverse = lookup_edge(e->to, e->from);
  93
  94         if(e->reverse)
  95                 e->reverse->reverse = e;
  96 }
  97
  98 void edge_del(edge_t *e) {
  99         if(e->reverse)
 100                 e->reverse->reverse = NULL;
 101
 102         splay_delete(edge_weight_tree, e);
 103         splay_delete(e->from->edge_tree, e);
 104 }
 105
 106 edge_t *lookup_edge(node_t *from, node_t *to) {
 107         edge_t v;
 108
 109         v.from = from;
 110         v.to = to;
 111
 112         return splay_search(from->edge_tree, &v);
 113 }
 114
 115 bool dump_edges(connection_t *c) {
 116         for splay_each(node_t, n, node_tree) {
 117                 for splay_each(edge_t, e, n->edge_tree) {
 118                         char *address = sockaddr2hostname(&e->address);
 119                         char* local_address = sockaddr2hostname(&e->local_address);
 120                         send_request(c, "%d %d %s %s %s %s %x %d",
 121                                         CONTROL, REQ_DUMP_EDGES,
 122                                         e->from->name, e->to->name, address,
 123                                         local_address, e->options, e->weight);
 124                         free(address);
 125                         free(local_address);
 126                 }
 127         }
 128
 129         return send_request(c, "%d %d", CONTROL, REQ_DUMP_EDGES);
 130 }