/* protocol_subnet.c -- handle the meta-protocol, subnets Copyright (C) 1999-2005 Ivo Timmermans, 2000-2009 Guus Sliepen 2009 Michael Tokarev This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include "system.h" #include "conf.h" #include "connection.h" #include "logger.h" #include "net.h" #include "netutl.h" #include "node.h" #include "protocol.h" #include "subnet.h" #include "utils.h" #include "xalloc.h" bool send_add_subnet(connection_t *c, const subnet_t *subnet) { char netstr[MAXNETSTR]; if(!net2str(netstr, sizeof(netstr), subnet)) { return false; } return send_request(c, "%d %x %s %s", ADD_SUBNET, rand(), subnet->owner->name, netstr); } bool add_subnet_h(connection_t *c) { char subnetstr[MAX_STRING_SIZE]; char name[MAX_STRING_SIZE]; node_t *owner; subnet_t s = {}, *new, *old; if(sscanf(c->buffer, "%*d %*x " MAX_STRING " " MAX_STRING, name, subnetstr) != 2) { logger(LOG_ERR, "Got bad %s from %s (%s)", "ADD_SUBNET", c->name, c->hostname); return false; } /* Check if owner name is valid */ if(!check_id(name)) { logger(LOG_ERR, "Got bad %s from %s (%s): %s", "ADD_SUBNET", c->name, c->hostname, "invalid name"); return false; } /* Check if subnet string is valid */ if(!str2net(&s, subnetstr)) { logger(LOG_ERR, "Got bad %s from %s (%s): %s", "ADD_SUBNET", c->name, c->hostname, "invalid subnet string"); return false; } if(seen_request(c->buffer)) { return true; } /* Check if the owner of the new subnet is in the connection list */ owner = lookup_node(name); if(tunnelserver && owner != myself && owner != c->node) { /* in case of tunnelserver, ignore indirect subnet registrations */ ifdebug(PROTOCOL) logger(LOG_WARNING, "Ignoring indirect %s from %s (%s) for %s", "ADD_SUBNET", c->name, c->hostname, subnetstr); return true; } if(!owner) { owner = new_node(); owner->name = xstrdup(name); node_add(owner); } /* Check if we already know this subnet */ if(lookup_subnet(owner, &s)) { return true; } /* If we don't know this subnet, but we are the owner, retaliate with a DEL_SUBNET */ if(owner == myself) { ifdebug(PROTOCOL) logger(LOG_WARNING, "Got %s from %s (%s) for ourself", "ADD_SUBNET", c->name, c->hostname); s.owner = myself; send_del_subnet(c, &s); return true; } /* In tunnel server mode, we should already know all allowed subnets */ if(tunnelserver) { logger(LOG_WARNING, "Ignoring unauthorized %s from %s (%s): %s", "ADD_SUBNET", c->name, c->hostname, subnetstr); return true; } /* Ignore if strictsubnets is true, but forward it to others */ if(strictsubnets) { logger(LOG_WARNING, "Ignoring unauthorized %s from %s (%s): %s", "ADD_SUBNET", c->name, c->hostname, subnetstr); forward_request(c); return true; } /* If everything is correct, add the subnet to the list of the owner */ *(new = new_subnet()) = s; subnet_add(owner, new); if(owner->status.reachable) { subnet_update(owner, new, true); } /* Tell the rest */ forward_request(c); /* Fast handoff of roaming MAC addresses */ if(s.type == SUBNET_MAC && owner != myself && (old = lookup_subnet(myself, &s)) && old->expires) { old->expires = now; } return true; } bool send_del_subnet(connection_t *c, const subnet_t *s) { char netstr[MAXNETSTR]; if(!net2str(netstr, sizeof(netstr), s)) { return false; } return send_request(c, "%d %x %s %s", DEL_SUBNET, rand(), s->owner->name, netstr); } bool del_subnet_h(connection_t *c) { char subnetstr[MAX_STRING_SIZE]; char name[MAX_STRING_SIZE]; node_t *owner; subnet_t s = {}, *find; if(sscanf(c->buffer, "%*d %*x " MAX_STRING " " MAX_STRING, name, subnetstr) != 2) { logger(LOG_ERR, "Got bad %s from %s (%s)", "DEL_SUBNET", c->name, c->hostname); return false; } /* Check if owner name is valid */ if(!check_id(name)) { logger(LOG_ERR, "Got bad %s from %s (%s): %s", "DEL_SUBNET", c->name, c->hostname, "invalid name"); return false; } /* Check if subnet string is valid */ if(!str2net(&s, subnetstr)) { logger(LOG_ERR, "Got bad %s from %s (%s): %s", "DEL_SUBNET", c->name, c->hostname, "invalid subnet string"); return false; } if(seen_request(c->buffer)) { return true; } /* Check if the owner of the subnet being deleted is in the connection list */ owner = lookup_node(name); if(tunnelserver && owner != myself && owner != c->node) { /* in case of tunnelserver, ignore indirect subnet deletion */ ifdebug(PROTOCOL) logger(LOG_WARNING, "Ignoring indirect %s from %s (%s) for %s", "DEL_SUBNET", c->name, c->hostname, subnetstr); return true; } if(!owner) { ifdebug(PROTOCOL) logger(LOG_WARNING, "Got %s from %s (%s) for %s which is not in our node tree", "DEL_SUBNET", c->name, c->hostname, name); return true; } /* If everything is correct, delete the subnet from the list of the owner */ s.owner = owner; find = lookup_subnet(owner, &s); if(!find) { ifdebug(PROTOCOL) logger(LOG_WARNING, "Got %s from %s (%s) for %s which does not appear in his subnet tree", "DEL_SUBNET", c->name, c->hostname, name); if(strictsubnets) { forward_request(c); } return true; } /* If we are the owner of this subnet, retaliate with an ADD_SUBNET */ if(owner == myself) { ifdebug(PROTOCOL) logger(LOG_WARNING, "Got %s from %s (%s) for ourself", "DEL_SUBNET", c->name, c->hostname); send_add_subnet(c, find); return true; } if(tunnelserver) { return true; } /* Tell the rest */ forward_request(c); if(strictsubnets) { return true; } /* Finally, delete it. */ if(owner->status.reachable) { subnet_update(owner, find, false); } subnet_del(owner, find); return true; }