X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fgraph.c;h=b5e81931f8d9aed4dc7526f2f1a02026696a6f93;hp=dd080c050ebb76cb42b3263810e703a2569cfde0;hb=82ebfc923ddb050c88bdf5d65ac943a15ca8748a;hpb=4b3aef9e6992ca78f1b17b179a3051d3fec0473d diff --git a/src/graph.c b/src/graph.c index dd080c05..b5e81931 100644 --- a/src/graph.c +++ b/src/graph.c @@ -1,7 +1,7 @@ /* graph.c -- graph algorithms - Copyright (C) 2001-2002 Guus Sliepen , - 2001-2002 Ivo Timmermans + Copyright (C) 2001-2002 Guus Sliepen , + 2001-2002 Ivo Timmermans 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 @@ -17,7 +17,7 @@ along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - $Id: graph.c,v 1.1.2.9 2002/03/12 16:30:15 guus Exp $ + $Id: graph.c,v 1.1.2.15 2002/09/04 13:48:51 guus Exp $ */ /* We need to generate two trees from the graph: @@ -44,10 +44,13 @@ destination address and port of a node if possible. */ +#include "config.h" + +#include #include #include "config.h" #include -#if defined(HAVE_FREEBSD) || defined(HAVE_OPENBSD) +#ifdef HAVE_SYS_PARAM_H #include #endif #include @@ -59,6 +62,8 @@ #include "node.h" #include "edge.h" #include "connection.h" +#include "process.h" +#include "device.h" #include "system.h" @@ -104,7 +109,7 @@ void mst_kruskal(void) /* Starting point */ - ((edge_t *)edge_weight_tree->head->data)->from.node->status.visited = 1; + ((edge_t *)edge_weight_tree->head->data)->from->status.visited = 1; /* Add safe edges */ @@ -113,24 +118,25 @@ void mst_kruskal(void) next = node->next; e = (edge_t *)node->data; - if(e->from.node->status.visited == e->to.node->status.visited) + if(!e->reverse || e->from->status.visited == e->to->status.visited) { skipped = 1; continue; } - e->from.node->status.visited = 1; - e->to.node->status.visited = 1; + e->from->status.visited = 1; + e->to->status.visited = 1; if(e->connection) e->connection->status.mst = 1; safe_edges++; if(debug_lvl >= DEBUG_SCARY_THINGS) - syslog(LOG_DEBUG, " Adding edge %s - %s weight %d", e->from.node->name, e->to.node->name, e->weight); + syslog(LOG_DEBUG, " Adding edge %s - %s weight %d", e->from->name, e->to->name, e->weight); if(skipped) { + skipped = 0; next = edge_weight_tree->head; continue; } @@ -149,8 +155,12 @@ void sssp_bfs(void) avl_node_t *node, *from, *next, *to; edge_t *e; node_t *n; - halfconnection_t to_hc, from_hc; avl_tree_t *todo_tree; + int indirect; + char *name; + char *address, *port; + char *envp[7]; + int i; todo_tree = avl_alloc_tree(NULL, NULL); @@ -160,11 +170,13 @@ void sssp_bfs(void) { n = (node_t *)node->data; n->status.visited = 0; + n->status.indirect = 1; } /* Begin with myself */ myself->status.visited = 1; + myself->status.indirect = 0; myself->nexthop = myself; myself->via = myself; node = avl_alloc_node(); @@ -183,31 +195,51 @@ void sssp_bfs(void) for(to = n->edge_tree->head; to; to = to->next) /* "to" is the edge connected to "from" */ { e = (edge_t *)to->data; - - if(e->from.node == n) /* "from_hc" is the halfconnection with .node == from */ - to_hc = e->to, from_hc = e->from; - else - to_hc = e->from, from_hc = e->to; - - if(!to_hc.node->status.visited) - { - to_hc.node->status.visited = 1; - to_hc.node->nexthop = (n->nexthop == myself) ? to_hc.node : n->nexthop; - to_hc.node->via = (e->options & OPTION_INDIRECT || n->via != n) ? n->via : to_hc.node; - to_hc.node->options = e->options; - if(sockaddrcmp(&to_hc.node->address, &to_hc.udpaddress)) - { - node = avl_unlink(node_udp_tree, to_hc.node); - to_hc.node->address = to_hc.udpaddress; - if(to_hc.node->hostname) - free(to_hc.node->hostname); - to_hc.node->hostname = sockaddr2hostname(&to_hc.udpaddress); - avl_insert_node(node_udp_tree, node); - } - node = avl_alloc_node(); - node->data = to_hc.node; - avl_insert_before(todo_tree, from, node); - } + + if(!e->reverse) + continue; + + /* Situation: + + / + / + ------(n)-----(e->to) + \ + \ + + n->address is set to the e->address of the edge left of n to n. + We are currently examining the edge e right of n from n: + + - If e->reverse->address != n->address, then e->to is probably + not reachable for the nodes left of n. We do as if the indirectdata + flag is set on edge e. + - If edge e provides for better reachability of e->to, update + e->to and (re)add it to the todo_tree to (re)examine the reachability + of nodes behind it. + */ + + indirect = n->status.indirect || e->options & OPTION_INDIRECT || ((n != myself) && sockaddrcmp(&n->address, &e->reverse->address)); + + if(e->to->status.visited && (!e->to->status.indirect || indirect)) + continue; + + e->to->status.visited = 1; + e->to->status.indirect = indirect; + e->to->nexthop = (n->nexthop == myself) ? e->to : n->nexthop; + e->to->via = indirect ? n->via : e->to; + e->to->options = e->options; + if(sockaddrcmp(&e->to->address, &e->address)) + { + node = avl_unlink(node_udp_tree, e->to); + e->to->address = e->address; + if(e->to->hostname) + free(e->to->hostname); + e->to->hostname = sockaddr2hostname(&e->to->address); + avl_insert_node(node_udp_tree, node); + } + node = avl_alloc_node(); + node->data = e->to; + avl_insert_before(todo_tree, from, node); } avl_delete_node(todo_tree, from); @@ -223,26 +255,36 @@ void sssp_bfs(void) next = node->next; n = (node_t *)node->data; - if(n->status.visited) + if(n->status.visited != n->status.reachable) { - if(!n->status.reachable) - { - if(debug_lvl >= DEBUG_TRAFFIC) + n->status.reachable = !n->status.reachable; + if(debug_lvl >= DEBUG_TRAFFIC) + if(n->status.reachable) syslog(LOG_DEBUG, _("Node %s (%s) became reachable"), n->name, n->hostname); - n->status.reachable = 1; - } - } - else - { - if(n->status.reachable) - { - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_DEBUG, _("Node %s (%s) became unreachable"), n->name, n->hostname); - n->status.reachable = 0; - n->status.validkey = 0; - n->status.waitingforkey = 0; - n->sent_seqno = 0; - } + else + syslog(LOG_DEBUG, _("Node %s (%s) became unreachable"), n->name, n->hostname); + + n->status.validkey = 0; + n->status.waitingforkey = 0; + n->sent_seqno = 0; + + asprintf(&envp[0], "NETNAME=%s", netname?netname:""); + asprintf(&envp[1], "DEVICE=%s", device?device:""); + asprintf(&envp[2], "INTERFACE=%s", interface?interface:""); + asprintf(&envp[3], "NODE=%s", n->name); + sockaddr2str(&n->address, &address, &port); + asprintf(&envp[4], "REMOTEADDRESS=%s", address); + asprintf(&envp[5], "REMOTEPORT=%s", port); + envp[6] = NULL; + + asprintf(&name, n->status.reachable?"hosts/%s-up":"hosts/%s-down", n->name); + execute_script(name, envp); + free(name); + free(address); + free(port); + + for(i = 0; i < 7; i++) + free(envp[i]); } } }