src/protocol_edge.c

   1 /*
   2     protocol_edge.c -- handle the meta-protocol, edges
   3     Copyright (C) 1999-2002 Ivo Timmermans <ivo@o2w.nl>,
   4                   2000-2002 Guus Sliepen <guus@sliepen.eu.org>
   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: protocol_edge.c,v 1.1.4.12 2002/09/09 21:24:48 guus Exp $
  21 */
  22
  23 #include "config.h"
  24
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <syslog.h>
  28 #include <stdio.h>
  29 #include <stdarg.h>
  30 #include <errno.h>
  31
  32 #include <utils.h>
  33 #include <xalloc.h>
  34 #include <avl_tree.h>
  35
  36 #include "conf.h"
  37 #include "net.h"
  38 #include "netutl.h"
  39 #include "protocol.h"
  40 #include "meta.h"
  41 #include "connection.h"
  42 #include "node.h"
  43 #include "edge.h"
  44 #include "graph.h"
  45
  46 #include "system.h"
  47
  48 int send_add_edge(connection_t * c, edge_t * e)
  49 {
  50         int x;
  51         char *address, *port;
  52
  53         cp();
  54
  55         sockaddr2str(&e->address, &address, &port);
  56
  57         x = send_request(c, "%d %lx %s %s %s %s %lx %d", ADD_EDGE, random(),
  58                                          e->from->name, e->to->name, address, port,
  59                                          e->options, e->weight);
  60         free(address);
  61         free(port);
  62
  63         return x;
  64 }
  65
  66 int add_edge_h(connection_t * c)
  67 {
  68         edge_t *e;
  69         node_t *from, *to;
  70         char from_name[MAX_STRING_SIZE];
  71         char to_name[MAX_STRING_SIZE];
  72         char to_address[MAX_STRING_SIZE];
  73         char to_port[MAX_STRING_SIZE];
  74         sockaddr_t address;
  75         long int options;
  76         int weight;
  77
  78         cp();
  79
  80         if(sscanf(c->buffer, "%*d %*x "MAX_STRING" "MAX_STRING" "MAX_STRING" "MAX_STRING" %lx %d",
  81                           from_name, to_name, to_address, to_port, &options, &weight) != 6) {
  82                 syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "ADD_EDGE", c->name,
  83                            c->hostname);
  84                 return -1;
  85         }
  86
  87         /* Check if names are valid */
  88
  89         if(check_id(from_name)) {
  90                 syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_EDGE", c->name,
  91                            c->hostname, _("invalid name"));
  92                 return -1;
  93         }
  94
  95         if(check_id(to_name)) {
  96                 syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_EDGE", c->name,
  97                            c->hostname, _("invalid name"));
  98                 return -1;
  99         }
 100
 101         if(seen_request(c->buffer))
 102                 return 0;
 103
 104         /* Lookup nodes */
 105
 106         from = lookup_node(from_name);
 107
 108         if(!from) {
 109                 from = new_node();
 110                 from->name = xstrdup(from_name);
 111                 node_add(from);
 112         }
 113
 114         to = lookup_node(to_name);
 115
 116         if(!to) {
 117                 to = new_node();
 118                 to->name = xstrdup(to_name);
 119                 node_add(to);
 120         }
 121
 122         /* Convert addresses */
 123
 124         address = str2sockaddr(to_address, to_port);
 125
 126         /* Check if edge already exists */
 127
 128         e = lookup_edge(from, to);
 129
 130         if(e) {
 131                 if(e->weight != weight || e->options != options || sockaddrcmp(&e->address, &address)) {
 132                         if(from == myself) {
 133                                 if(debug_lvl >= DEBUG_PROTOCOL)
 134                                         syslog(LOG_WARNING, _("Got %s from %s (%s) for ourself which does not match existing entry"),
 135                                                    "ADD_EDGE", c->name, c->hostname);
 136                                 send_add_edge(c, e);
 137                                 return 0;
 138                         } else {
 139                                 if(debug_lvl >= DEBUG_PROTOCOL)
 140                                         syslog(LOG_WARNING, _("Got %s from %s (%s) which does not match existing entry"),
 141                                                    "ADD_EDGE", c->name, c->hostname);
 142                                 edge_del(e);
 143                         }
 144                 } else
 145                         return 0;
 146         } else if(from == myself) {
 147                 if(debug_lvl >= DEBUG_PROTOCOL)
 148                         syslog(LOG_WARNING, _("Got %s from %s (%s) for ourself which does not exist"),
 149                                    "ADD_EDGE", c->name, c->hostname);
 150                 e = new_edge();
 151                 e->from = from;
 152                 e->to = to;
 153                 send_del_edge(c, e);
 154                 free_edge(e);
 155                 return 0;
 156         }
 157
 158         e = new_edge();
 159         e->from = from;
 160         e->to = to;
 161         e->address = address;
 162         e->options = options;
 163         e->weight = weight;
 164         edge_add(e);
 165
 166         /* Tell the rest about the new edge */
 167
 168         forward_request(c);
 169
 170         /* Run MST before or after we tell the rest? */
 171
 172         graph();
 173
 174         return 0;
 175 }
 176
 177 int send_del_edge(connection_t * c, edge_t * e)
 178 {
 179         cp();
 180
 181         return send_request(c, "%d %lx %s %s", DEL_EDGE, random(),
 182                                                 e->from->name, e->to->name);
 183 }
 184
 185 int del_edge_h(connection_t * c)
 186 {
 187         edge_t *e;
 188         char from_name[MAX_STRING_SIZE];
 189         char to_name[MAX_STRING_SIZE];
 190         node_t *from, *to;
 191
 192         cp();
 193
 194         if(sscanf(c->buffer, "%*d %*x "MAX_STRING" "MAX_STRING, from_name, to_name) != 2) {
 195                 syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "DEL_EDGE", c->name,
 196                            c->hostname);
 197                 return -1;
 198         }
 199
 200         /* Check if names are valid */
 201
 202         if(check_id(from_name)) {
 203                 syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_EDGE", c->name,
 204                            c->hostname, _("invalid name"));
 205                 return -1;
 206         }
 207
 208         if(check_id(to_name)) {
 209                 syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_EDGE", c->name,
 210                            c->hostname, _("invalid name"));
 211                 return -1;
 212         }
 213
 214         if(seen_request(c->buffer))
 215                 return 0;
 216
 217         /* Lookup nodes */
 218
 219         from = lookup_node(from_name);
 220
 221         if(!from) {
 222                 if(debug_lvl >= DEBUG_PROTOCOL)
 223                         syslog(LOG_ERR,
 224                                    _
 225                                    ("Got %s from %s (%s) which does not appear in the edge tree"),
 226                                    "DEL_EDGE", c->name, c->hostname);
 227                 return 0;
 228         }
 229
 230         to = lookup_node(to_name);
 231
 232         if(!to) {
 233                 if(debug_lvl >= DEBUG_PROTOCOL)
 234                         syslog(LOG_ERR,
 235                                    _
 236                                    ("Got %s from %s (%s) which does not appear in the edge tree"),
 237                                    "DEL_EDGE", c->name, c->hostname);
 238                 return 0;
 239         }
 240
 241         /* Check if edge exists */
 242
 243         e = lookup_edge(from, to);
 244
 245         if(!e) {
 246                 if(debug_lvl >= DEBUG_PROTOCOL)
 247                         syslog(LOG_WARNING,
 248                                    _
 249                                    ("Got %s from %s (%s) which does not appear in the edge tree"),
 250                                    "DEL_EDGE", c->name, c->hostname);
 251                 return 0;
 252         }
 253
 254         if(e->from == myself) {
 255                 if(debug_lvl >= DEBUG_PROTOCOL)
 256                         syslog(LOG_WARNING, _("Got %s from %s (%s) for ourself"),
 257                                    "DEL_EDGE", c->name, c->hostname);
 258                 send_add_edge(c, e);    /* Send back a correction */
 259                 return 0;
 260         }
 261
 262         /* Tell the rest about the deleted edge */
 263
 264         forward_request(c);
 265
 266         /* Delete the edge */
 267
 268         edge_del(e);
 269
 270         /* Run MST before or after we tell the rest? */
 271
 272         graph();
 273
 274         return 0;
 275 }