X-Git-Url: http://git.meshlink.io/?p=meshlink;a=blobdiff_plain;f=src%2Fnet.c;h=2ee8aee446bc1df899354fb1cb93c1373e7aa844;hp=286f15763e2f6cbd4e7bf632f91c550106d718f7;hb=8c8b506da9ce578fe6e6e406a91bbd21af13f7a3;hpb=57991e264202ad83e2c1b663777b358bf5573652 diff --git a/src/net.c b/src/net.c index 286f1576..2ee8aee4 100644 --- a/src/net.c +++ b/src/net.c @@ -1,9 +1,6 @@ /* net.c -- most of the network code - Copyright (C) 1998-2005 Ivo Timmermans, - 2000-2013 Guus Sliepen - 2006 Scott Lamb - 2011 Loïc Grenié + Copyright (C) 2014-2017 Guus Sliepen 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 @@ -25,63 +22,26 @@ #include "utils.h" #include "conf.h" #include "connection.h" -#include "device.h" #include "graph.h" #include "logger.h" +#include "meshlink_internal.h" #include "meta.h" -#include "names.h" #include "net.h" #include "netutl.h" #include "protocol.h" -#include "subnet.h" +#include "sptps.h" #include "xalloc.h" -int contradicting_add_edge = 0; -int contradicting_del_edge = 0; -static int sleeptime = 10; -time_t last_config_check = 0; -static timeout_t pingtimer; -static timeout_t periodictimer; +#include -/* Purge edges and subnets of unreachable nodes. Use carefully. */ - -void purge(void) { - logger(DEBUG_PROTOCOL, LOG_DEBUG, "Purging unreachable nodes"); - - /* Remove all edges and subnets owned by unreachable nodes. */ - - for splay_each(node_t, n, node_tree) { - if(!n->status.reachable) { - logger(DEBUG_SCARY_THINGS, LOG_DEBUG, "Purging node %s (%s)", n->name, n->hostname); - - for splay_each(subnet_t, s, n->subnet_tree) { - send_del_subnet(everyone, s); - if(!strictsubnets) - subnet_del(n, s); - } - - for splay_each(edge_t, e, n->edge_tree) { - if(!tunnelserver) - send_del_edge(everyone, e); - edge_del(e); - } - } - } - - /* Check if anyone else claims to have an edge to an unreachable node. If not, delete node. */ - - for splay_each(node_t, n, node_tree) { - if(!n->status.reachable) { - for splay_each(edge_t, e, edge_weight_tree) - if(e->to == n) - return; - - if(!autoconnect && (!strictsubnets || !n->subnet_tree->head)) - /* in strictsubnets mode do not delete nodes with subnets */ - node_del(n); - } - } +#if !defined(min) +static inline int min(int a, int b) { + return a < b ? a : b; } +#endif + +static const int default_timeout = 5; +static const int default_interval = 60; /* Terminate a connection: @@ -90,45 +50,48 @@ void purge(void) { - Kill it with fire - Check if we need to retry making an outgoing connection */ -void terminate_connection(connection_t *c, bool report) { - logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Closing connection with %s (%s)", c->name, c->hostname); +void terminate_connection(meshlink_handle_t *mesh, connection_t *c, bool report) { + logger(mesh, MESHLINK_INFO, "Closing connection with %s", c->name); c->status.active = false; - if(c->node && c->node->connection == c) + if(c->node && c->node->connection == c) { c->node->connection = NULL; + } if(c->edge) { - if(report && !tunnelserver) - send_del_edge(everyone, c->edge); + if(report) { + send_del_edge(mesh, mesh->everyone, c->edge, 0); + } - edge_del(c->edge); + edge_del(mesh, c->edge); c->edge = NULL; /* Run MST and SSSP algorithms */ - graph(); + graph(mesh); /* If the node is not reachable anymore but we remember it had an edge to us, clean it up */ - if(report && !c->node->status.reachable) { + if(report && c->node && !c->node->status.reachable) { edge_t *e; - e = lookup_edge(c->node, myself); + e = lookup_edge(c->node, mesh->self); + if(e) { - if(!tunnelserver) - send_del_edge(everyone, e); - edge_del(e); + send_del_edge(mesh, mesh->everyone, e, 0); + edge_del(mesh, e); } } } outgoing_t *outgoing = c->outgoing; - connection_del(c); + connection_del(mesh, c); /* Check if this was our outgoing connection */ - if(outgoing) - do_outgoing_connection(outgoing); + if(outgoing) { + do_outgoing_connection(mesh, outgoing); + } } /* @@ -139,333 +102,635 @@ void terminate_connection(connection_t *c, bool report) { end does not reply in time, we consider them dead and close the connection. */ -static void timeout_handler(void *data) { - for list_each(connection_t, c, connection_list) { - if(c->status.control) - continue; +static void timeout_handler(event_loop_t *loop, void *data) { + assert(data); + + meshlink_handle_t *mesh = loop->data; + logger(mesh, MESHLINK_DEBUG, "timeout_handler()"); + + for list_each(connection_t, c, mesh->connections) { + int pingtimeout = c->node ? mesh->dev_class_traits[c->node->devclass].pingtimeout : default_timeout; + int pinginterval = c->node ? mesh->dev_class_traits[c->node->devclass].pinginterval : default_interval; + + if(c->outgoing && c->outgoing->timeout < 5) { + pingtimeout = 1; + } + + // Also make sure that if outstanding key requests for the UDP counterpart of a connection has timed out, we restart it. + if(c->node) { + if(c->node->status.waitingforkey && c->node->last_req_key + pingtimeout <= mesh->loop.now.tv_sec) { + send_req_key(mesh, c->node); + } + } - if(c->last_ping_time + pingtimeout <= now.tv_sec) { + if(c->status.active && c->last_key_renewal + 3600 < mesh->loop.now.tv_sec) { + if(!sptps_force_kex(&c->sptps)) { + logger(mesh, MESHLINK_ERROR, "SPTPS key renewal for connection with %s failed", c->name); + terminate_connection(mesh, c, true); + continue; + } else { + c->last_key_renewal = mesh->loop.now.tv_sec; + } + } + + if(c->last_ping_time + pingtimeout <= mesh->loop.now.tv_sec) { if(c->status.active) { if(c->status.pinged) { - logger(DEBUG_CONNECTIONS, LOG_INFO, "%s (%s) didn't respond to PING in %ld seconds", c->name, c->hostname, (long)now.tv_sec - c->last_ping_time); - } else if(c->last_ping_time + pinginterval <= now.tv_sec) { - send_ping(c); + logger(mesh, MESHLINK_INFO, "%s didn't respond to PING in %ld seconds", c->name, (long)mesh->loop.now.tv_sec - c->last_ping_time); + } else if(c->last_ping_time + pinginterval <= mesh->loop.now.tv_sec) { + send_ping(mesh, c); continue; } else { continue; } } else { - if(c->status.connecting) - logger(DEBUG_CONNECTIONS, LOG_WARNING, "Timeout while connecting to %s (%s)", c->name, c->hostname); - else - logger(DEBUG_CONNECTIONS, LOG_WARNING, "Timeout from %s (%s) during authentication", c->name, c->hostname); + if(c->status.connecting) { + logger(mesh, MESHLINK_WARNING, "Timeout while connecting to %s", c->name); + } else { + logger(mesh, MESHLINK_WARNING, "Timeout from %s during authentication", c->name); + } } - terminate_connection(c, c->status.active); + + terminate_connection(mesh, c, c->status.active); } } - timeout_set(data, &(struct timeval){pingtimeout, rand() % 100000}); + timeout_set(&mesh->loop, data, &(struct timespec) { + 1, prng(mesh, TIMER_FUDGE) + }); } -static void periodic_handler(void *data) { +// devclass asc, last_successfull_connection desc +static int node_compare_devclass_asc_lsc_desc(const void *a, const void *b) { + const node_t *na = a, *nb = b; + + if(na->devclass < nb->devclass) { + return -1; + } + + if(na->devclass > nb->devclass) { + return 1; + } + + if(na->last_successfull_connection == nb->last_successfull_connection) { + return 0; + } + + if(na->last_successfull_connection == 0 || na->last_successfull_connection > nb->last_successfull_connection) { + return -1; + } + + if(nb->last_successfull_connection == 0 || na->last_successfull_connection < nb->last_successfull_connection) { + return 1; + } + + if(na < nb) { + return -1; + } + + if(na > nb) { + return 1; + } + + return 0; +} + +// last_successfull_connection desc +static int node_compare_lsc_desc(const void *a, const void *b) { + const node_t *na = a, *nb = b; + + if(na->last_successfull_connection == nb->last_successfull_connection) { + return 0; + } + + if(na->last_successfull_connection == 0 || na->last_successfull_connection > nb->last_successfull_connection) { + return -1; + } + + if(nb->last_successfull_connection == 0 || na->last_successfull_connection < nb->last_successfull_connection) { + return 1; + } + + if(na < nb) { + return -1; + } + + if(na > nb) { + return 1; + } + + return 0; +} + +// devclass desc +static int node_compare_devclass_desc(const void *a, const void *b) { + const node_t *na = a, *nb = b; + + if(na->devclass < nb->devclass) { + return -1; + } + + if(na->devclass > nb->devclass) { + return 1; + } + + if(na < nb) { + return -1; + } + + if(na > nb) { + return 1; + } + + return 0; +} + + +/* + +autoconnect() +{ + timeout = 5 + + // find the best one for initial connect + + if cur < min + newcon = + first from nodes + where dclass <= my.dclass and !connection and (timestamp - last_retry) > retry_timeout + order by dclass asc, last_connection desc + if newcon + timeout = 0 + goto connect + + + // find better nodes to connect to: in case we have less than min connections within [BACKBONE, i] and there are nodes which we are not connected to within the range + + if min <= cur < max + j = 0 + for i = BACKBONE to my.dclass + j += count(from connections where node.dclass = i) + if j < min + newcon = + first from nodes + where dclass = i and !connection and (timestamp - last_retry) > retry_timeout + order by last_connection desc + if newcon + goto connect + else + break + + + // heal partitions + + if min <= cur < max + newcon = + first from nodes + where dclass <= my.dclass and !reachable and (timestamp - last_retry) > retry_timeout + order by dclass asc, last_connection desc + if newcon + goto connect + + + // connect + +connect: + if newcon + connect newcon + + + // disconnect outgoing connections in case we have more than min connections within [BACKBONE, i] and there are nodes which we are connected to within the range [i, PORTABLE] + + if min < cur <= max + j = 0 + for i = BACKBONE to my.dclass + j += count(from connections where node.dclass = i) + if min < j + delcon = + first from nodes + where dclass >= i and outgoing_connection + order by dclass desc + if disconnect + goto disconnect + else + break + + + // disconnect connections in case we have more than enough connections + + if max < cur + delcon = + first from nodes + where outgoing_connection + order by dclass desc + goto disconnect + + // disconnect + +disconnect + if delcon + disconnect delcon + + + // next iteration + next (timeout, autoconnect) + +} + +*/ + + +static void periodic_handler(event_loop_t *loop, void *data) { + meshlink_handle_t *mesh = loop->data; + /* Check if there are too many contradicting ADD_EDGE and DEL_EDGE messages. This usually only happens when another node has the same Name as this node. If so, sleep for a short while to prevent a storm of contradicting messages. */ - if(contradicting_del_edge > 100 && contradicting_add_edge > 100) { - logger(DEBUG_ALWAYS, LOG_WARNING, "Possible node with same Name as us! Sleeping %d seconds.", sleeptime); - usleep(sleeptime * 1000000LL); - sleeptime *= 2; - if(sleeptime < 0) - sleeptime = 3600; + if(mesh->contradicting_del_edge > 100 && mesh->contradicting_add_edge > 100) { + logger(mesh, MESHLINK_WARNING, "Possible node with same Name as us! Sleeping %d seconds.", mesh->sleeptime); + struct timespec ts = {mesh->sleeptime, 0}; + clock_nanosleep(CLOCK_MONOTONIC, 0, &ts, NULL); + mesh->sleeptime *= 2; + + if(mesh->sleeptime < 0) { + mesh->sleeptime = 3600; + } } else { - sleeptime /= 2; - if(sleeptime < 10) - sleeptime = 10; + mesh->sleeptime /= 2; + + if(mesh->sleeptime < 10) { + mesh->sleeptime = 10; + } } - contradicting_add_edge = 0; - contradicting_del_edge = 0; + mesh->contradicting_add_edge = 0; + mesh->contradicting_del_edge = 0; + + int timeout = default_timeout; + + /* Check if we need to make or break connections. */ + + if(mesh->nodes->count > 1) { - /* If AutoConnect is set, check if we need to make or break connections. */ + logger(mesh, MESHLINK_DEBUG, "--- autoconnect begin ---"); - if(autoconnect && node_tree->count > 1) { - /* Count number of active connections */ - int nc = 0; - for list_each(connection_t, c, connection_list) { - if(c->status.active && !c->status.control) - nc++; + int retry_timeout = min(mesh->nodes->count * default_timeout, 60); + + logger(mesh, MESHLINK_DEBUG, "* devclass = %d", mesh->devclass); + logger(mesh, MESHLINK_DEBUG, "* nodes = %d", mesh->nodes->count); + logger(mesh, MESHLINK_DEBUG, "* retry_timeout = %d", retry_timeout); + + + // connect disconnect nodes + + node_t *connect_to = NULL; + node_t *disconnect_from = NULL; + + + // get cur_connects + + unsigned int cur_connects = 0; + + for list_each(connection_t, c, mesh->connections) { + if(c->status.active) { + cur_connects += 1; + } } - if(nc < autoconnect) { - /* Not enough active connections, try to add one. - Choose a random node, if we don't have a connection to it, - and we are not already trying to make one, create an - outgoing connection to this node. - */ - int r = rand() % node_tree->count; - int i = 0; - - for splay_each(node_t, n, node_tree) { - if(i++ != r) - continue; + logger(mesh, MESHLINK_DEBUG, "* cur_connects = %d", cur_connects); + logger(mesh, MESHLINK_DEBUG, "* outgoings = %d", mesh->outgoings->count); - if(n->connection) - break; + // get min_connects and max_connects - bool found = false; + unsigned int min_connects = mesh->dev_class_traits[mesh->devclass].min_connects; + unsigned int max_connects = mesh->dev_class_traits[mesh->devclass].max_connects; - for list_each(outgoing_t, outgoing, outgoing_list) { - if(!strcmp(outgoing->name, n->name)) { - found = true; - break; - } - } + logger(mesh, MESHLINK_DEBUG, "* min_connects = %d", min_connects); + logger(mesh, MESHLINK_DEBUG, "* max_connects = %d", max_connects); + + // find the best one for initial connect - if(!found) { - logger(DEBUG_CONNECTIONS, LOG_INFO, "Autoconnecting to %s", n->name); - outgoing_t *outgoing = xzalloc(sizeof *outgoing); - outgoing->name = xstrdup(n->name); - list_insert_tail(outgoing_list, outgoing); - setup_outgoing_connection(outgoing); + if(cur_connects < min_connects) { + splay_tree_t *nodes = splay_alloc_tree(node_compare_devclass_asc_lsc_desc, NULL); + + for splay_each(node_t, n, mesh->nodes) { + logger(mesh, MESHLINK_DEBUG, "* %s->devclass = %d", n->name, n->devclass); + + if(n != mesh->self && n->devclass <= mesh->devclass && !n->connection && !n->status.blacklisted && (n->last_connect_try == 0 || (mesh->loop.now.tv_sec - n->last_connect_try) > retry_timeout)) { + splay_insert(nodes, n); } - break; } - } else if(nc > autoconnect) { - /* Too many active connections, try to remove one. - Choose a random outgoing connection to a node - that has at least one other connection. - */ - int r = rand() % nc; - int i = 0; - - for list_each(connection_t, c, connection_list) { - if(!c->status.active || c->status.control) - continue; - - if(i++ != r) - continue; - if(!c->outgoing || !c->node || c->node->edge_tree->count < 2) - break; + if(nodes->head) { + //timeout = 0; + connect_to = (node_t *)nodes->head->data; - logger(DEBUG_CONNECTIONS, LOG_INFO, "Autodisconnecting from %s", c->name); - list_delete(outgoing_list, c->outgoing); - c->outgoing = NULL; - terminate_connection(c, c->status.active); - break; + logger(mesh, MESHLINK_DEBUG, "* found best one for initial connect: %s", connect_to->name); + } else { + logger(mesh, MESHLINK_DEBUG, "* could not find node for initial connect"); } + + splay_delete_tree(nodes); } - if(nc >= autoconnect) { - /* If we have enough active connections, - remove any pending outgoing connections. - */ - for list_each(outgoing_t, o, outgoing_list) { - bool found = false; - for list_each(connection_t, c, connection_list) { - if(c->outgoing == o) { - found = true; - break; + + // find better nodes to connect to + + if(!connect_to && min_connects <= cur_connects && cur_connects < max_connects) { + unsigned int connects = 0; + + for(dev_class_t devclass = 0; devclass <= mesh->devclass; ++devclass) { + for list_each(connection_t, c, mesh->connections) { + if(c->status.active && c->node && c->node->devclass == devclass) { + connects += 1; } } - if(!found) { - logger(DEBUG_CONNECTIONS, LOG_INFO, "Cancelled outgoing connection to %s", o->name); - list_delete_node(outgoing_list, node); + + if(connects < min_connects) { + splay_tree_t *nodes = splay_alloc_tree(node_compare_lsc_desc, NULL); + + for splay_each(node_t, n, mesh->nodes) { + if(n != mesh->self && n->devclass == devclass && !n->connection && !n->status.blacklisted && (n->last_connect_try == 0 || (mesh->loop.now.tv_sec - n->last_connect_try) > retry_timeout)) { + splay_insert(nodes, n); + } + } + + if(nodes->head) { + logger(mesh, MESHLINK_DEBUG, "* found better node"); + connect_to = (node_t *)nodes->head->data; + + splay_delete_tree(nodes); + break; + } + + splay_delete_tree(nodes); + } else { + break; } } + + if(!connect_to) { + logger(mesh, MESHLINK_DEBUG, "* could not find better nodes"); + } } - } - timeout_set(data, &(struct timeval){5, rand() % 100000}); -} -void handle_meta_connection_data(connection_t *c) { - if (!receive_meta(c)) { - terminate_connection(c, c->status.active); - return; - } -} + // heal partitions -#ifndef HAVE_MINGW -static void sigterm_handler(void *data) { - logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s signal", strsignal(((signal_t *)data)->signum)); - event_exit(); -} + if(!connect_to && min_connects <= cur_connects && cur_connects < max_connects) { + splay_tree_t *nodes = splay_alloc_tree(node_compare_devclass_asc_lsc_desc, NULL); -static void sighup_handler(void *data) { - logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s signal", strsignal(((signal_t *)data)->signum)); - reopenlogger(); - if(reload_configuration()) - exit(1); -} + for splay_each(node_t, n, mesh->nodes) { + if(n != mesh->self && n->devclass <= mesh->devclass && !n->status.reachable && !n->status.blacklisted && (n->last_connect_try == 0 || (mesh->loop.now.tv_sec - n->last_connect_try) > retry_timeout)) { + splay_insert(nodes, n); + } + } -static void sigalrm_handler(void *data) { - logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s signal", strsignal(((signal_t *)data)->signum)); - retry(); -} -#endif + if(nodes->head) { + logger(mesh, MESHLINK_DEBUG, "* try to heal partition"); + connect_to = (node_t *)nodes->head->data; + } else { + logger(mesh, MESHLINK_DEBUG, "* could not find nodes for partition healing"); + } -int reload_configuration(void) { - char *fname = NULL; + splay_delete_tree(nodes); + } - /* Reread our own configuration file */ - exit_configuration(&config_tree); - init_configuration(&config_tree); + // perform connect - if(!read_server_config()) { - logger(DEBUG_ALWAYS, LOG_ERR, "Unable to reread configuration file."); - return EINVAL; - } + if(connect_to && !connect_to->connection) { + connect_to->last_connect_try = mesh->loop.now.tv_sec; + logger(mesh, MESHLINK_DEBUG, "Autoconnect trying to connect to %s", connect_to->name); - read_config_options(config_tree, NULL); + /* check if there is already a connection attempt to this node */ + bool skip = false; - xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, myself->name); - read_config_file(config_tree, fname); - free(fname); + for list_each(outgoing_t, outgoing, mesh->outgoings) { + if(outgoing->node == connect_to) { + logger(mesh, MESHLINK_DEBUG, "* skip autoconnect since it is an outgoing connection already"); + skip = true; + break; + } + } - /* Parse some options that are allowed to be changed while tinc is running */ + if(!connect_to->status.reachable && !node_read_public_key(mesh, connect_to)) { + logger(mesh, MESHLINK_DEBUG, "* skip autoconnect since we don't know this node's public key"); + skip = true; + } - setup_myself_reloadable(); + if(!skip) { + logger(mesh, MESHLINK_DEBUG, "Autoconnecting to %s", connect_to->name); + outgoing_t *outgoing = xzalloc(sizeof(outgoing_t)); + outgoing->node = connect_to; + list_insert_tail(mesh->outgoings, outgoing); + setup_outgoing_connection(mesh, outgoing); + } + } - /* If StrictSubnet is set, expire deleted Subnets and read new ones in */ - if(strictsubnets) { - for splay_each(subnet_t, subnet, subnet_tree) - subnet->expires = 1; + // disconnect suboptimal outgoing connections - load_all_subnets(); + if(min_connects < cur_connects /*&& cur_connects <= max_connects*/) { + unsigned int connects = 0; - for splay_each(subnet_t, subnet, subnet_tree) { - if(subnet->expires == 1) { - send_del_subnet(everyone, subnet); - if(subnet->owner->status.reachable) - subnet_update(subnet->owner, subnet, false); - subnet_del(subnet->owner, subnet); - } else if(subnet->expires == -1) { - subnet->expires = 0; - } else { - send_add_subnet(everyone, subnet); - if(subnet->owner->status.reachable) - subnet_update(subnet->owner, subnet, true); + for(dev_class_t devclass = 0; devclass <= mesh->devclass; ++devclass) { + for list_each(connection_t, c, mesh->connections) { + if(c->status.active && c->node && c->node->devclass == devclass) { + connects += 1; + } + } + + if(min_connects < connects) { + splay_tree_t *nodes = splay_alloc_tree(node_compare_devclass_desc, NULL); + + for list_each(connection_t, c, mesh->connections) { + if(c->outgoing && c->node && c->node->devclass >= devclass) { + splay_insert(nodes, c->node); + } + } + + if(nodes->head) { + logger(mesh, MESHLINK_DEBUG, "* disconnect suboptimal outgoing connection"); + disconnect_from = (node_t *)nodes->head->data; + } + + splay_delete_tree(nodes); + break; + } + } + + if(!disconnect_from) { + logger(mesh, MESHLINK_DEBUG, "* no suboptimal outgoing connections"); } } - } else { /* Only read our own subnets back in */ - for splay_each(subnet_t, subnet, myself->subnet_tree) - if(!subnet->expires) - subnet->expires = 1; - config_t *cfg = lookup_config(config_tree, "Subnet"); - while(cfg) { - subnet_t *subnet, *s2; + // disconnect connections (too many connections) - if(!get_config_subnet(cfg, &subnet)) - continue; + if(!disconnect_from && max_connects < cur_connects) { + splay_tree_t *nodes = splay_alloc_tree(node_compare_devclass_desc, NULL); + + for list_each(connection_t, c, mesh->connections) { + if(c->status.active && c->node) { + splay_insert(nodes, c->node); + } + } - if((s2 = lookup_subnet(myself, subnet))) { - if(s2->expires == 1) - s2->expires = 0; + if(nodes->head) { + logger(mesh, MESHLINK_DEBUG, "* disconnect connection (too many connections)"); - free_subnet(subnet); + //timeout = 0; + disconnect_from = (node_t *)nodes->head->data; } else { - subnet_add(myself, subnet); - send_add_subnet(everyone, subnet); - subnet_update(myself, subnet, true); + logger(mesh, MESHLINK_DEBUG, "* no node we want to disconnect, even though we have too many connections"); } - cfg = lookup_config_next(config_tree, cfg); + splay_delete_tree(nodes); } - for splay_each(subnet_t, subnet, myself->subnet_tree) { - if(subnet->expires == 1) { - send_del_subnet(everyone, subnet); - subnet_update(myself, subnet, false); - subnet_del(myself, subnet); - } + + // perform disconnect + + if(disconnect_from && disconnect_from->connection) { + logger(mesh, MESHLINK_DEBUG, "Autodisconnecting from %s", disconnect_from->connection->name); + list_delete(mesh->outgoings, disconnect_from->connection->outgoing); + disconnect_from->connection->outgoing = NULL; + terminate_connection(mesh, disconnect_from->connection, disconnect_from->connection->status.active); } - } - /* Try to make outgoing connections */ + // reduce timeout if we don't have enough connections + outgoings + if(cur_connects + mesh->outgoings->count < 3) { + timeout = 1; + } - try_outgoing_connections(); + // done! - /* Close connections to hosts that have a changed or deleted host config file */ + logger(mesh, MESHLINK_DEBUG, "--- autoconnect end ---"); + } - for list_each(connection_t, c, connection_list) { - if(c->status.control) - continue; + for splay_each(node_t, n, mesh->nodes) { + if(n->status.dirty) { + if(!node_write_config(mesh, n)) { + logger(mesh, MESHLINK_DEBUG, "Could not update %s", n->name); + } - xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name); - struct stat s; - if(stat(fname, &s) || s.st_mtime > last_config_check) { - logger(DEBUG_CONNECTIONS, LOG_INFO, "Host config file of %s has been changed", c->name); - terminate_connection(c, c->status.active); + n->status.dirty = false; + } + + if(n->status.validkey && n->last_req_key + 3600 < mesh->loop.now.tv_sec) { + logger(mesh, MESHLINK_DEBUG, "SPTPS key renewal for node %s", n->name); + + if(!sptps_force_kex(&n->sptps)) { + logger(mesh, MESHLINK_ERROR, "SPTPS key renewal for node %s failed", n->name); + n->status.validkey = false; + sptps_stop(&n->sptps); + n->status.waitingforkey = false; + n->last_req_key = 0; + } else { + n->last_req_key = mesh->loop.now.tv_sec; + } } - free(fname); } - last_config_check = now.tv_sec; + timeout_set(&mesh->loop, data, &(struct timespec) { + timeout, prng(mesh, TIMER_FUDGE) + }); +} - return 0; +void handle_meta_connection_data(meshlink_handle_t *mesh, connection_t *c) { + if(!receive_meta(mesh, c)) { + terminate_connection(mesh, c, c->status.active); + return; + } } -void retry(void) { +void retry(meshlink_handle_t *mesh) { /* Reset the reconnection timers for all outgoing connections */ - for list_each(outgoing_t, outgoing, outgoing_list) { + for list_each(outgoing_t, outgoing, mesh->outgoings) { outgoing->timeout = 0; - if(outgoing->ev.cb) - timeout_set(&outgoing->ev, &(struct timeval){0, 0}); + + if(outgoing->ev.cb) { + timeout_set(&mesh->loop, &outgoing->ev, &(struct timespec) { + 0, 0 + }); + } } - /* Check for outgoing connections that are in progress, and reset their ping timers */ - for list_each(connection_t, c, connection_list) { - if(c->outgoing && !c->node) + /* For active connections, check if their addresses are still valid. + * If yes, reset their ping timers, otherwise terminate them. */ + for list_each(connection_t, c, mesh->connections) { + if(!c->status.active) { + continue; + } + + if(!c->status.pinged) { c->last_ping_time = 0; + } + + sockaddr_t sa; + socklen_t salen = sizeof(sa); + + if(getsockname(c->socket, &sa.sa, &salen)) { + continue; + } + + switch(sa.sa.sa_family) { + case AF_INET: + sa.in.sin_port = 0; + break; + + case AF_INET6: + sa.in6.sin6_port = 0; + break; + + default: + continue; + } + + int sock = socket(sa.sa.sa_family, SOCK_STREAM, IPPROTO_TCP); + + if(sock != -1) { + continue; + } + + if(bind(sock, &sa.sa, salen) && errno == EADDRNOTAVAIL) { + logger(mesh, MESHLINK_DEBUG, "Local address for connection to %s no longer valid, terminating", c->name); + terminate_connection(mesh, c, c->status.active); + } + + closesocket(sock); } /* Kick the ping timeout handler */ - timeout_set(&pingtimer, &(struct timeval){0, 0}); + timeout_set(&mesh->loop, &mesh->pingtimer, &(struct timespec) { + 0, 0 + }); } /* this is where it all happens... */ -int main_loop(void) { - timeout_add(&pingtimer, timeout_handler, &pingtimer, &(struct timeval){pingtimeout, rand() % 100000}); - timeout_add(&periodictimer, periodic_handler, &periodictimer, &(struct timeval){pingtimeout, rand() % 100000}); - -#ifndef HAVE_MINGW - signal_t sighup = {0}; - signal_t sigterm = {0}; - signal_t sigquit = {0}; - signal_t sigint = {0}; - signal_t sigalrm = {0}; - - signal_add(&sighup, sighup_handler, &sighup, SIGHUP); - signal_add(&sigterm, sigterm_handler, &sigterm, SIGTERM); - signal_add(&sigquit, sigterm_handler, &sigquit, SIGQUIT); - signal_add(&sigint, sigterm_handler, &sigint, SIGINT); - signal_add(&sigalrm, sigalrm_handler, &sigalrm, SIGALRM); -#endif - - if(!event_loop()) { - logger(DEBUG_ALWAYS, LOG_ERR, "Error while waiting for input: %s", strerror(errno)); - return 1; +void main_loop(meshlink_handle_t *mesh) { + timeout_add(&mesh->loop, &mesh->pingtimer, timeout_handler, &mesh->pingtimer, &(struct timespec) { + 1, prng(mesh, TIMER_FUDGE) + }); + timeout_add(&mesh->loop, &mesh->periodictimer, periodic_handler, &mesh->periodictimer, &(struct timespec) { + 0, 0 + }); + + //Add signal handler + mesh->datafromapp.signum = 0; + signal_add(&mesh->loop, &mesh->datafromapp, meshlink_send_from_queue, mesh, mesh->datafromapp.signum); + + if(!event_loop_run(&mesh->loop, &mesh->mutex)) { + logger(mesh, MESHLINK_ERROR, "Error while waiting for input: %s", strerror(errno)); + call_error_cb(mesh, MESHLINK_ENETWORK); } -#ifndef HAVE_MINGW - signal_del(&sighup); - signal_del(&sigterm); - signal_del(&sigquit); - signal_del(&sigint); - signal_del(&sigalrm); -#endif - - timeout_del(&periodictimer); - timeout_del(&pingtimer); - - return 0; + signal_del(&mesh->loop, &mesh->datafromapp); + timeout_del(&mesh->loop, &mesh->periodictimer); + timeout_del(&mesh->loop, &mesh->pingtimer); }