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 "xalloc.h"
  30
  31 static int edge_weight_compare(const edge_t *a, const edge_t *b) {
  32         int result;
  33
  34         result = a->weight - b->weight;
  35
  36         if(result) {
  37                 return result;
  38         }
  39
  40         result = strcmp(a->from->name, b->from->name);
  41
  42         if(result) {
  43                 return result;
  44         }
  45
  46         return strcmp(a->to->name, b->to->name);
  47 }
  48
  49 splay_tree_t edge_weight_tree = {
  50         .compare = (splay_compare_t) edge_weight_compare,
  51 };
  52
  53 static int edge_compare(const edge_t *a, const edge_t *b) {
  54         return strcmp(a->to->name, b->to->name);
  55 }
  56
  57 void init_edge_tree(splay_tree_t *tree) {
  58         memset(tree, 0, sizeof(*tree));
  59         tree->compare = (splay_compare_t) edge_compare;
  60         tree->delete = (splay_action_t) free_edge;
  61 }
  62
  63 void exit_edges(void) {
  64         splay_empty_tree(&edge_weight_tree);
  65 }
  66
  67 /* Creation and deletion of connection elements */
  68
  69 edge_t *new_edge(void) {
  70         return xzalloc(sizeof(edge_t));
  71 }
  72
  73 void free_edge(edge_t *e) {
  74         if(e) {
  75                 sockaddrfree(&e->address);
  76                 sockaddrfree(&e->local_address);
  77
  78                 free(e);
  79         }
  80 }
  81
  82 void edge_add(edge_t *e) {
  83         splay_node_t *node = splay_insert(&e->from->edge_tree, e);
  84
  85         if(!node) {
  86                 logger(DEBUG_ALWAYS, LOG_ERR, "Edge from %s to %s already exists in edge_tree\n", e->from->name, e->to->name);
  87                 return;
  88         }
  89
  90
  91         e->reverse = lookup_edge(e->to, e->from);
  92
  93         if(e->reverse) {
  94                 e->reverse->reverse = e;
  95         }
  96
  97         node = splay_insert(&edge_weight_tree, e);
  98
  99         if(!node) {
 100                 logger(DEBUG_ALWAYS, LOG_ERR, "Edge from %s to %s already exists in edge_weight_tree\n", e->from->name, e->to->name);
 101                 return;
 102         }
 103 }
 104
 105 void edge_del(edge_t *e) {
 106         if(e->reverse) {
 107                 e->reverse->reverse = NULL;
 108         }
 109
 110         splay_delete(&edge_weight_tree, e);
 111         splay_delete(&e->from->edge_tree, e);
 112 }
 113
 114 edge_t *lookup_edge(node_t *from, node_t *to) {
 115         edge_t v;
 116
 117         v.from = from;
 118         v.to = to;
 119
 120         return splay_search(&from->edge_tree, &v);
 121 }
 122
 123 bool dump_edges(connection_t *c) {
 124         for splay_each(node_t, n, &node_tree) {
 125                 for splay_each(edge_t, e, &n->edge_tree) {
 126                         char *address = sockaddr2hostname(&e->address);
 127                         char *local_address = sockaddr2hostname(&e->local_address);
 128                         send_request(c, "%d %d %s %s %s %s %x %d",
 129                                      CONTROL, REQ_DUMP_EDGES,
 130                                      e->from->name, e->to->name, address,
 131                                      local_address, e->options, e->weight);
 132                         free(address);
 133                         free(local_address);
 134                 }
 135         }
 136
 137         return send_request(c, "%d %d", CONTROL, REQ_DUMP_EDGES);
 138 }