X-Git-Url: http://git.meshlink.io/?a=blobdiff_plain;f=src%2Fnet.c;h=80e866a0ad461fc49bce1794379044ca97e2e33c;hb=e4e5a81447142da0fb1291b2d2119ed6981b89e5;hp=6979083f1948690d5f468b2ce45d2c43be5d82f8;hpb=4712d8f92e63e86e835ffb624d6399343ee568ea;p=meshlink diff --git a/src/net.c b/src/net.c index 6979083f..80e866a0 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, - 2000-2012 Guus Sliepen - 2006 Scott Lamb - 2011 Loïc Grenié + Copyright (C) 2014 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 @@ -22,200 +19,75 @@ #include "system.h" -#include - #include "utils.h" -#include "avl_tree.h" #include "conf.h" #include "connection.h" -#include "device.h" -#include "event.h" #include "graph.h" #include "logger.h" +#include "meshlink_internal.h" #include "meta.h" #include "net.h" #include "netutl.h" -#include "process.h" #include "protocol.h" -#include "route.h" -#include "subnet.h" #include "xalloc.h" -bool do_purge = false; -volatile bool running = false; -#ifdef HAVE_PSELECT -bool graph_dump = false; -#endif - -time_t now = 0; -int contradicting_add_edge = 0; -int contradicting_del_edge = 0; -static int sleeptime = 10; - -/* Purge edges and subnets of unreachable nodes. Use carefully. */ - -static void purge(void) { - avl_node_t *nnode, *nnext, *enode, *enext, *snode, *snext; - node_t *n; - edge_t *e; - subnet_t *s; - - ifdebug(PROTOCOL) logger(LOG_DEBUG, "Purging unreachable nodes"); - - /* Remove all edges and subnets owned by unreachable nodes. */ +#include - for(nnode = node_tree->head; nnode; nnode = nnext) { - nnext = nnode->next; - n = nnode->data; - - if(!n->status.reachable) { - ifdebug(SCARY_THINGS) logger(LOG_DEBUG, "Purging node %s (%s)", n->name, - n->hostname); - - for(snode = n->subnet_tree->head; snode; snode = snext) { - snext = snode->next; - s = snode->data; - send_del_subnet(everyone, s); - if(!strictsubnets) - subnet_del(n, s); - } - - for(enode = n->edge_tree->head; enode; enode = enext) { - enext = enode->next; - e = enode->data; - 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(nnode = node_tree->head; nnode; nnode = nnext) { - nnext = nnode->next; - n = nnode->data; - - if(!n->status.reachable) { - for(enode = edge_weight_tree->head; enode; enode = enext) { - enext = enode->next; - e = enode->data; - - if(e->to == n) - break; - } - - if(!enode && (!strictsubnets || !n->subnet_tree->head)) - /* in strictsubnets mode do not delete nodes with subnets */ - node_del(n); - } - } -} - -/* - put all file descriptors in an fd_set array - While we're at it, purge stuff that needs to be removed. -*/ -static int build_fdset(fd_set *readset, fd_set *writeset) { - avl_node_t *node, *next; - connection_t *c; - int i, max = 0; - - FD_ZERO(readset); - FD_ZERO(writeset); - - for(node = connection_tree->head; node; node = next) { - next = node->next; - c = node->data; - - if(c->status.remove) { - connection_del(c); - if(!connection_tree->head) - purge(); - } else { - FD_SET(c->socket, readset); - if(c->outbuflen > 0) - FD_SET(c->socket, writeset); - if(c->socket > max) - max = c->socket; - } - } - - for(i = 0; i < listen_sockets; i++) { - FD_SET(listen_socket[i].tcp, readset); - if(listen_socket[i].tcp > max) - max = listen_socket[i].tcp; - FD_SET(listen_socket[i].udp, readset); - if(listen_socket[i].udp > max) - max = listen_socket[i].udp; - } - - if(device_fd >= 0) - FD_SET(device_fd, readset); - if(device_fd > max) - max = device_fd; - - return max; +static const int min(int a, int b) { + return a < b ? a : b; } /* Terminate a connection: - - Close the socket - - Remove associated edge and tell other connections about it if report = true + - Mark it as inactive + - Remove the edge representing this connection + - Kill it with fire - Check if we need to retry making an outgoing connection - - Deactivate the host */ -void terminate_connection(connection_t *c, bool report) { - if(c->status.remove) - return; - - ifdebug(CONNECTIONS) logger(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 (%s)", c->name, c->hostname); - c->status.remove = true; c->status.active = false; - if(c->node) + if(c->node && c->node->connection == c) c->node->connection = NULL; - if(c->socket) - closesocket(c->socket); - if(c->edge) { - if(report && !tunnelserver) - send_del_edge(everyone, c->edge); + if(report) + send_del_edge(mesh, mesh->everyone, c->edge); - 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) { 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); + edge_del(mesh, e); } } } + outgoing_t *outgoing = c->outgoing; + connection_del(mesh, c); + /* Check if this was our outgoing connection */ - if(c->outgoing) { - retry_outgoing(c->outgoing); - c->outgoing = NULL; - } + if(outgoing) + do_outgoing_connection(mesh, outgoing); - free(c->outbuf); - c->outbuf = NULL; - c->outbuflen = 0; - c->outbufsize = 0; - c->outbufstart = 0; +#ifndef HAVE_MINGW + /* Clean up dead proxy processes */ + + while(waitpid(-1, NULL, WNOHANG) > 0); +#endif } /* @@ -226,387 +98,491 @@ void terminate_connection(connection_t *c, bool report) { end does not reply in time, we consider them dead and close the connection. */ -static void check_dead_connections(void) { - avl_node_t *node, *next; - connection_t *c; - - for(node = connection_tree->head; node; node = next) { - next = node->next; - c = node->data; - - if(c->last_ping_time + pingtimeout <= now) { +static void timeout_handler(event_loop_t *loop, void *data) { + meshlink_handle_t *mesh = loop->data; + logger(mesh, MESHLINK_DEBUG, "timeout_handler()"); + + for list_each(connection_t, c, mesh->connections) { + // 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 + mesh->pingtimeout <= mesh->loop.now.tv_sec) + send_req_key(mesh, c->node); + } + if(c->last_ping_time + mesh->pingtimeout <= mesh->loop.now.tv_sec) { if(c->status.active) { if(c->status.pinged) { - ifdebug(CONNECTIONS) logger(LOG_INFO, "%s (%s) didn't respond to PING in %ld seconds", - c->name, c->hostname, now - c->last_ping_time); - c->status.timeout = true; - terminate_connection(c, true); - } else if(c->last_ping_time + pinginterval <= now) { - send_ping(c); - } - } else { - if(c->status.remove) { - logger(LOG_WARNING, "Old connection_t for %s (%s) status %04x still lingering, deleting...", - c->name, c->hostname, bitfield_to_int(&c->status, sizeof c->status)); - connection_del(c); + logger(mesh, MESHLINK_INFO, "%s (%s) didn't respond to PING in %ld seconds", c->name, c->hostname, (long)mesh->loop.now.tv_sec - c->last_ping_time); + } else if(c->last_ping_time + mesh->pinginterval <= mesh->loop.now.tv_sec) { + send_ping(mesh, c); continue; - } - ifdebug(CONNECTIONS) logger(LOG_WARNING, "Timeout from %s (%s) during authentication", - c->name, c->hostname); - if(c->status.connecting) { - c->status.connecting = false; - closesocket(c->socket); - do_outgoing_connection(c); } else { - terminate_connection(c, false); + continue; } + } else { + if(c->status.connecting) + logger(mesh, MESHLINK_WARNING, "Timeout while connecting to %s (%s)", c->name, c->hostname); + else + logger(mesh, MESHLINK_WARNING, "Timeout from %s (%s) during authentication", c->name, c->hostname); } - } - - if(c->outbuflen > 0 && c->last_flushed_time + pingtimeout <= now) { - if(c->status.active) { - ifdebug(CONNECTIONS) logger(LOG_INFO, - "%s (%s) could not flush for %ld seconds (%d bytes remaining)", - c->name, c->hostname, now - c->last_flushed_time, c->outbuflen); - c->status.timeout = true; - terminate_connection(c, true); - } + terminate_connection(mesh, c, c->status.active); } } + + timeout_set(&mesh->loop, data, &(struct timeval){mesh->pingtimeout, rand() % 100000}); +} + +// devclass asc, last_connect_try desc +static int node_compare_devclass_asc_last_connect_try_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_connect_try == nb->last_connect_try) + return 0; + + if(nb->last_connect_try == 0 || na->last_connect_try < nb->last_connect_try) + return -1; + + if(na->last_connect_try == 0 || na->last_connect_try > nb->last_connect_try) + return 1; + + return 0; +} + +// last_connect_try desc +static int node_compare_last_connect_try_desc(const void *a, const void *b) +{ + const node_t *na = a, *nb = b; + + if(na->last_connect_try == nb->last_connect_try) + return 0; + + if(nb->last_connect_try == 0 || na->last_connect_try < nb->last_connect_try) + return -1; + + if(na->last_connect_try == 0 || na->last_connect_try > nb->last_connect_try) + 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; } + + return 0; } + /* - check all connections to see if anything - happened on their sockets -*/ -static void check_network_activity(fd_set * readset, fd_set * writeset) { - connection_t *c; - avl_node_t *node; - int result, i; - socklen_t len = sizeof(result); - vpn_packet_t packet; - static int errors = 0; - - /* check input from kernel */ - if(device_fd >= 0 && FD_ISSET(device_fd, readset)) { - if(devops.read(&packet)) { - errors = 0; - packet.priority = 0; - route(myself, &packet); - } else { - usleep(errors * 50000); - errors++; - if(errors > 10) { - logger(LOG_ERR, "Too many errors from %s, exiting!", device); - running = false; - } - } + + +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(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); + usleep(mesh->sleeptime * 1000000LL); + mesh->sleeptime *= 2; + if(mesh->sleeptime < 0) + mesh->sleeptime = 3600; + } else { + mesh->sleeptime /= 2; + if(mesh->sleeptime < 10) + mesh->sleeptime = 10; } - /* check meta connections */ - for(node = connection_tree->head; node; node = node->next) { - c = node->data; - - if(c->status.remove) - continue; - - if(FD_ISSET(c->socket, readset)) { - if(c->status.connecting) { - c->status.connecting = false; - getsockopt(c->socket, SOL_SOCKET, SO_ERROR, (void *)&result, &len); - - if(!result) - finish_connecting(c); - else { - ifdebug(CONNECTIONS) logger(LOG_DEBUG, - "Error while connecting to %s (%s): %s", - c->name, c->hostname, sockstrerror(result)); - closesocket(c->socket); - do_outgoing_connection(c); - continue; - } - } + mesh->contradicting_add_edge = 0; + mesh->contradicting_del_edge = 0; - if(!receive_meta(c)) { - terminate_connection(c, c->status.active); - continue; - } - } + int timeout = 5; + + /* Check if we need to make or break connections. */ + + if(mesh->nodes->count > 1) { + + logger(mesh, MESHLINK_INFO, "--- autoconnect begin ---"); + + + int retry_timeout = min(mesh->nodes->count * 5, 60); + + // connect disconnect nodes + + node_t* connect_to = NULL; + node_t* disconnect_from = NULL; - if(FD_ISSET(c->socket, writeset)) { - if(!flush_meta(c)) { - terminate_connection(c, c->status.active); - continue; + + // get cur_connects + + int cur_connects = 0; + + for list_each(connection_t, c, mesh->connections) + { + if(!c->status.remove_unused) + { + cur_connects += 1; } } - } - for(i = 0; i < listen_sockets; i++) { - if(FD_ISSET(listen_socket[i].udp, readset)) - handle_incoming_vpn_data(i); + logger(mesh, MESHLINK_INFO, "* cur_connects = %d", cur_connects); - if(FD_ISSET(listen_socket[i].tcp, readset)) - handle_new_meta_connection(listen_socket[i].tcp); - } -} -/* - this is where it all happens... -*/ -int main_loop(void) { - fd_set readset, writeset; -#ifdef HAVE_PSELECT - struct timespec tv; - sigset_t omask, block_mask; - time_t next_event; -#else - struct timeval tv; -#endif - int r, maxfd; - time_t last_ping_check, last_config_check, last_graph_dump; - event_t *event; - - last_ping_check = now; - last_config_check = now; - last_graph_dump = now; - - srand(now); - -#ifdef HAVE_PSELECT - if(lookup_config(config_tree, "GraphDumpFile")) - graph_dump = true; - /* Block SIGHUP & SIGALRM */ - sigemptyset(&block_mask); - sigaddset(&block_mask, SIGHUP); - sigaddset(&block_mask, SIGALRM); - sigprocmask(SIG_BLOCK, &block_mask, &omask); -#endif + // get min_connects and max_connects - running = true; - - while(running) { -#ifdef HAVE_PSELECT - next_event = last_ping_check + pingtimeout; - if(graph_dump && next_event > last_graph_dump + 60) - next_event = last_graph_dump + 60; - - if((event = peek_next_event()) && next_event > event->time) - next_event = event->time; - - if(next_event <= now) - tv.tv_sec = 0; - else - tv.tv_sec = next_event - now; - tv.tv_nsec = 0; -#else - tv.tv_sec = 1; - tv.tv_usec = 0; -#endif + assert(mesh->devclass >= 0 && mesh->devclass <= _DEV_CLASS_MAX); - maxfd = build_fdset(&readset, &writeset); + int min_connects = dev_class_traits[mesh->devclass].min_connects; + int max_connects = dev_class_traits[mesh->devclass].max_connects; -#ifdef HAVE_MINGW - LeaveCriticalSection(&mutex); -#endif -#ifdef HAVE_PSELECT - r = pselect(maxfd + 1, &readset, &writeset, NULL, &tv, &omask); -#else - r = select(maxfd + 1, &readset, &writeset, NULL, &tv); -#endif - now = time(NULL); -#ifdef HAVE_MINGW - EnterCriticalSection(&mutex); -#endif + logger(mesh, MESHLINK_INFO, "* min_connects = %d", min_connects); + logger(mesh, MESHLINK_INFO, "* max_connects = %d", max_connects); + + + // find the best one for initial connect + + if(cur_connects < min_connects) + { + splay_tree_t *nodes = splay_alloc_tree(node_compare_devclass_asc_last_connect_try_desc, NULL); - if(r < 0) { - if(!sockwouldblock(sockerrno)) { - logger(LOG_ERR, "Error while waiting for input: %s", sockstrerror(sockerrno)); - dump_connections(); - return 1; + for splay_each(node_t, n, mesh->nodes) + { + if(n->devclass <= mesh->devclass && !n->connection && (n->last_connect_try == 0 || (time(NULL) - n->last_connect_try) > retry_timeout)) + { splay_insert(nodes, n); } } - } - if(r > 0) - check_network_activity(&readset, &writeset); + if(nodes->head) + { + logger(mesh, MESHLINK_INFO, "* found best one for initial connect"); + + //timeout = 0; + connect_to = (node_t*)nodes->head->data; + } - if(do_purge) { - purge(); - do_purge = false; + splay_free_tree(nodes); } - /* Let's check if everybody is still alive */ - if(last_ping_check + pingtimeout <= now) { - check_dead_connections(); - last_ping_check = now; + // find better nodes to connect to - if(routing_mode == RMODE_SWITCH) - age_subnets(); + if(!connect_to && min_connects <= cur_connects && cur_connects < max_connects) + { + unsigned int connects = 0; - age_past_requests(); + for(int devclass = 0; devclass <= mesh->devclass; ++devclass) + { + for list_each(connection_t, c, mesh->connections) + { + if(!c->status.remove_unused && c->node && c->node->devclass == devclass) + { connects += 1; } + } - /* Should we regenerate our key? */ + if( connects < min_connects ) + { + splay_tree_t *nodes = splay_alloc_tree(node_compare_last_connect_try_desc, NULL); - if(keyexpires <= now) { - avl_node_t *node; - node_t *n; + for splay_each(node_t, n, mesh->nodes) + { + if(n->devclass == devclass && !n->connection && (n->last_connect_try == 0 || (time(NULL) - n->last_connect_try) > retry_timeout)) + { splay_insert(nodes, n); } + } - ifdebug(STATUS) logger(LOG_INFO, "Expiring symmetric keys"); + if(nodes->head) + { + logger(mesh, MESHLINK_INFO, "* found better node"); + connect_to = (node_t*)nodes->head->data; - for(node = node_tree->head; node; node = node->next) { - n = node->data; - if(n->inkey) { - free(n->inkey); - n->inkey = NULL; + splay_free_tree(nodes); + break; } + + splay_free_tree(nodes); } + else + { break; } + } + } + - send_key_changed(); - keyexpires = now + keylifetime; + // heal partitions + + if(!connect_to && min_connects <= cur_connects && cur_connects < max_connects) + { + splay_tree_t *nodes = splay_alloc_tree(node_compare_devclass_asc_last_connect_try_desc, NULL); + + for splay_each(node_t, n, mesh->nodes) + { + if(n->devclass <= mesh->devclass && !n->status.reachable && (n->last_connect_try == 0 || (time(NULL) - n->last_connect_try) > retry_timeout)) + { splay_insert(nodes, n); } } - /* Detect ADD_EDGE/DEL_EDGE storms that are caused when - * two tinc daemons with the same name are on the VPN. - * If so, sleep a while. If this happens multiple times - * in a row, sleep longer. */ - - if(contradicting_del_edge > 100 && contradicting_add_edge > 100) { - logger(LOG_WARNING, "Possible node with same Name as us! Sleeping %d seconds.", sleeptime); - usleep(sleeptime * 1000000LL); - sleeptime *= 2; - if(sleeptime < 0) - sleeptime = 3600; - } else { - sleeptime /= 2; - if(sleeptime < 10) - sleeptime = 10; + if(nodes->head) + { + logger(mesh, MESHLINK_INFO, "* try to heal partition"); + connect_to = (node_t*)nodes->head->data; } - contradicting_add_edge = 0; - contradicting_del_edge = 0; + splay_free_tree(nodes); } - if(sigalrm) { - avl_node_t *node; - logger(LOG_INFO, "Flushing event queue"); - expire_events(); - for(node = connection_tree->head; node; node = node->next) { - connection_t *c = node->data; - send_ping(c); + + // perform connect + + if(connect_to && !connect_to->connection) + { + /* check if there is already a connection attempt to this node */ + bool found = false; + for list_each(outgoing_t, outgoing, mesh->outgoings) { + if(!strcmp(outgoing->name, connect_to->name)) { + found = true; + break; + } } - sigalrm = false; - } - while((event = get_expired_event())) { - event->handler(event->data); - free_event(event); + if(!found) + { + logger(mesh, MESHLINK_INFO, "Autoconnecting to %s", connect_to->name); + outgoing_t *outgoing = xzalloc(sizeof(outgoing_t)); + outgoing->mesh = mesh; + outgoing->name = xstrdup(connect_to->name); + list_insert_tail(mesh->outgoings, outgoing); + setup_outgoing_connection(mesh, outgoing); + } } - if(sighup) { - connection_t *c; - avl_node_t *node, *next; - char *fname; - struct stat s; - - sighup = false; - reopenlogger(); - - /* Reread our own configuration file */ + // disconnect suboptimal outgoing connections - exit_configuration(&config_tree); - init_configuration(&config_tree); + if(min_connects < cur_connects && cur_connects <= max_connects) + { + unsigned int connects = 0; - if(!read_server_config()) { - logger(LOG_ERR, "Unable to reread configuration file, exitting."); - return 1; - } + for(int devclass = 0; devclass <= mesh->devclass; ++devclass) + { + for list_each(connection_t, c, mesh->connections) + { + if(!c->status.remove_unused && c->node && c->node->devclass == devclass) + { connects += 1; } + } - /* Cancel non-active outgoing connections */ + if( min_connects < connects ) + { + splay_tree_t *nodes = splay_alloc_tree(node_compare_devclass_desc, NULL); - for(node = connection_tree->head; node; node = next) { - next = node->next; - c = node->data; + for list_each(connection_t, c, mesh->connections) + { + if(!c->status.remove_unused && c->outgoing && c->node && c->node->devclass >= devclass) + { splay_insert(nodes, c->node); } + } - c->outgoing = NULL; + if(nodes->head) + { + logger(mesh, MESHLINK_INFO, "* disconnect suboptimal outgoing connection"); + disconnect_from = (node_t*)nodes->head->data; + } - if(c->status.connecting) { - terminate_connection(c, false); - connection_del(c); + splay_free_tree(nodes); + break; } } + } - /* Wipe list of outgoing connections */ - for(list_node_t *node = outgoing_list->head; node; node = node->next) { - outgoing_t *outgoing = node->data; + // disconnect connections (too many connections) - if(outgoing->event) - event_del(outgoing->event); - } + if(!disconnect_from && max_connects < cur_connects) + { + splay_tree_t *nodes = splay_alloc_tree(node_compare_devclass_desc, NULL); - list_delete_list(outgoing_list); - - /* Close connections to hosts that have a changed or deleted host config file */ - - for(node = connection_tree->head; node; node = node->next) { - c = node->data; - - xasprintf(&fname, "%s/hosts/%s", confbase, c->name); - if(stat(fname, &s) || s.st_mtime > last_config_check) - terminate_connection(c, c->status.active); - free(fname); + for list_each(connection_t, c, mesh->connections) + { + if(!c->status.remove_unused && c->node) + { splay_insert(nodes, c->node); } } - last_config_check = now; + if(nodes->head) + { + logger(mesh, MESHLINK_INFO, "* disconnect connection (too many connections"); - /* If StrictSubnet is set, expire deleted Subnets and read new ones in */ + //timeout = 0; + disconnect_from = (node_t*)nodes->head->data; + } - if(strictsubnets) { - subnet_t *subnet; + splay_free_tree(nodes); + } - for(node = subnet_tree->head; node; node = node->next) { - subnet = node->data; - subnet->expires = 1; - } - load_all_subnets(); - - for(node = subnet_tree->head; node; node = next) { - next = node->next; - subnet = node->data; - 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); - } - } - } + // perform disconnect - /* Try to make outgoing connections */ - - try_outgoing_connections(); + if(disconnect_from && disconnect_from->connection) + { + logger(mesh, MESHLINK_INFO, "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); } - - /* Dump graph if wanted every 60 seconds*/ - if(last_graph_dump + 60 <= now) { - dump_graph(); - last_graph_dump = now; - } + + // done! + + logger(mesh, MESHLINK_INFO, "--- autoconnect end ---"); } -#ifdef HAVE_PSELECT - /* Restore SIGHUP & SIGALARM mask */ - sigprocmask(SIG_SETMASK, &omask, NULL); -#endif + timeout_set(&mesh->loop, data, &(struct timeval){timeout, rand() % 100000}); +} + +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(meshlink_handle_t *mesh) { + /* Reset the reconnection timers for all outgoing connections */ + for list_each(outgoing_t, outgoing, mesh->outgoings) { + outgoing->timeout = 0; + if(outgoing->ev.cb) + timeout_set(&mesh->loop, &outgoing->ev, &(struct timeval){0, 0}); + } + + /* Check for outgoing connections that are in progress, and reset their ping timers */ + for list_each(connection_t, c, mesh->connections) { + if(c->outgoing && !c->node) + c->last_ping_time = 0; + } + + /* Kick the ping timeout handler */ + timeout_set(&mesh->loop, &mesh->pingtimer, &(struct timeval){0, 0}); +} + +/* + this is where it all happens... +*/ +int main_loop(meshlink_handle_t *mesh) { + timeout_add(&mesh->loop, &mesh->pingtimer, timeout_handler, &mesh->pingtimer, &(struct timeval){mesh->pingtimeout, rand() % 100000}); + timeout_add(&mesh->loop, &mesh->periodictimer, periodic_handler, &mesh->periodictimer, &(struct timeval){0, 0}); + + //Add signal handler + mesh->datafromapp.signum = 0; + signal_add(&(mesh->loop),&(mesh->datafromapp), (signal_cb_t)meshlink_send_from_queue,mesh, mesh->datafromapp.signum); + + if(!event_loop_run(&(mesh->loop), &(mesh->mesh_mutex))) { + logger(mesh, MESHLINK_ERROR, "Error while waiting for input: %s", strerror(errno)); + return 1; + } + + timeout_del(&mesh->loop, &mesh->periodictimer); + timeout_del(&mesh->loop, &mesh->pingtimer); return 0; }