X-Git-Url: https://www.tinc-vpn.org/git/browse?a=blobdiff_plain;f=src%2Fnet.c;h=1cb467d4ccc95b1446896fffd141ed5467a1ba9e;hb=refs%2Ftags%2Frelease-1.1pre15;hp=28fa9955b9e87c79ce871335c8030efa1110f9e3;hpb=0b8b23e0dd7219344543f135ca0aeba8a4a42d48;p=tinc diff --git a/src/net.c b/src/net.c index 28fa9955..1cb467d4 100644 --- a/src/net.c +++ b/src/net.c @@ -1,9 +1,9 @@ /* net.c -- most of the network code Copyright (C) 1998-2005 Ivo Timmermans, - 2000-2012 Guus Sliepen + 2000-2017 Guus Sliepen 2006 Scott Lamb - 2011 Loïc Grenié + 2011 Loïc Grenié 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 @@ -22,24 +22,28 @@ #include "system.h" -#include "utils.h" +#include "autoconnect.h" #include "conf.h" #include "connection.h" #include "device.h" #include "graph.h" #include "logger.h" #include "meta.h" +#include "names.h" #include "net.h" #include "netutl.h" -#include "process.h" #include "protocol.h" #include "subnet.h" +#include "utils.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; +static struct timeval last_periodic_run_time; /* Purge edges and subnets of unreachable nodes. Use carefully. */ @@ -74,7 +78,7 @@ void purge(void) { if(e->to == n) return; - if(!strictsubnets || !n->subnet_tree->head) + if(!autoconnect && (!strictsubnets || !n->subnet_tree->head)) /* in strictsubnets mode do not delete nodes with subnets */ node_del(n); } @@ -91,31 +95,31 @@ void purge(void) { void terminate_connection(connection_t *c, bool report) { logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Closing connection with %s (%s)", c->name, c->hostname); - c->status.active = false; + if(c->node) { + if(c->node->connection == c) + c->node->connection = NULL; - if(c->node && c->node->connection == c) - c->node->connection = NULL; + if(c->edge) { + if(report && !tunnelserver) + send_del_edge(everyone, c->edge); - if(c->edge) { - if(report && !tunnelserver) - send_del_edge(everyone, c->edge); + edge_del(c->edge); + c->edge = NULL; - edge_del(c->edge); - c->edge = NULL; + /* Run MST and SSSP algorithms */ - /* Run MST and SSSP algorithms */ + graph(); - graph(); + /* If the node is not reachable anymore but we remember it had an edge to us, clean it up */ - /* 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); - if(e) { - if(!tunnelserver) - send_del_edge(everyone, e); - edge_del(e); + if(report && !c->node->status.reachable) { + edge_t *e; + e = lookup_edge(c->node, myself); + if(e) { + if(!tunnelserver) + send_del_edge(everyone, e); + edge_del(e); + } } } } @@ -127,6 +131,12 @@ void terminate_connection(connection_t *c, bool report) { if(outgoing) do_outgoing_connection(outgoing); + +#ifndef HAVE_MINGW + /* Clean up dead proxy processes */ + + while(waitpid(-1, NULL, WNOHANG) > 0); +#endif } /* @@ -137,36 +147,91 @@ 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(int fd, short events, void *event) { - time_t now = time(NULL); +static void timeout_handler(void *data) { + + bool close_all_connections = false; + + /* + timeout_handler will start after 30 seconds from start of tincd + hold information about the elapsed time since last time the handler + has been run + */ + long sleep_time = now.tv_sec - last_periodic_run_time.tv_sec; + /* + It seems that finding sane default value is harder than expected + Since we send every second a UDP packet to make holepunching work + And default UDP state expire on firewalls is between 15-30 seconds + we drop all connections after 60 Seconds - UDPDiscoveryTimeout=30 + by default + */ + if (sleep_time > 2 * udp_discovery_timeout) { + logger(DEBUG_ALWAYS, LOG_ERR, "Awaking from dead after %ld seconds of sleep", sleep_time); + /* + Do not send any packets to tinc after we wake up. + The other node probably closed our connection but we still + are holding context information to them. This may happen on + laptops or any other hardware which can be suspended for some time. + Sending any data to node that wasn't expecting it will produce + annoying and misleading errors on the other side about failed signature + verification and or about missing sptps context + */ + close_all_connections = true; + } + last_periodic_run_time = now; for list_each(connection_t, c, connection_list) { + // control connections (eg. tinc ctl) do not have any timeout if(c->status.control) continue; - if(c->last_ping_time + pingtimeout <= now) { - 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 - c->last_ping_time); - } else if(c->last_ping_time + pinginterval <= now) { - send_ping(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); - } - terminate_connection(c, c->status.active); + if(close_all_connections) { + logger(DEBUG_ALWAYS, LOG_ERR, "Forcing connection close after sleep time %s (%s)", c->name, c->hostname); + terminate_connection(c, c->edge); + continue; } + + // Bail out early if we haven't reached the ping timeout for this node yet + if(c->last_ping_time + pingtimeout > now.tv_sec) + continue; + + // timeout during connection establishing + if(!c->edge) { + 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); + + terminate_connection(c, c->edge); + continue; + } + + // helps in UDP holepunching + try_tx(c->node, false); + + // timeout during ping + 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)); + terminate_connection(c, c->edge); + continue; + } + + // check whether we need to send a new ping + if(c->last_ping_time + pinginterval <= now.tv_sec) + send_ping(c); } + timeout_set(data, &(struct timeval){1, rand() % 100000}); +} + +static void periodic_handler(void *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); + nanosleep(&(struct timespec){sleeptime, 0}, NULL); sleeptime *= 2; if(sleeptime < 0) sleeptime = 3600; @@ -179,52 +244,42 @@ static void timeout_handler(int fd, short events, void *event) { contradicting_add_edge = 0; contradicting_del_edge = 0; - event_add(event, &(struct timeval){pingtimeout, 0}); -} - -void handle_meta_connection_data(int fd, short events, void *data) { - connection_t *c = data; - int result; - socklen_t len = sizeof result; + /* If AutoConnect is set, check if we need to make or break connections. */ - if(c->status.connecting) { - c->status.connecting = false; + if(autoconnect && node_tree->count > 1) + do_autoconnect(); - getsockopt(c->socket, SOL_SOCKET, SO_ERROR, &result, &len); - - if(!result) - finish_connecting(c); - else { - logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Error while connecting to %s (%s): %s", c->name, c->hostname, sockstrerror(result)); - terminate_connection(c, false); - return; - } - } + 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); + terminate_connection(c, c->edge); return; } } -static void sigterm_handler(int signal, short events, void *data) { - logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s signal", strsignal(signal)); - event_loopexit(NULL); +#ifndef HAVE_MINGW +static void sigterm_handler(void *data) { + logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s signal", strsignal(((signal_t *)data)->signum)); + event_exit(); } -static void sighup_handler(int signal, short events, void *data) { - logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s signal", strsignal(signal)); +static void sighup_handler(void *data) { + logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s signal", strsignal(((signal_t *)data)->signum)); reopenlogger(); - reload_configuration(); + if(reload_configuration()) + exit(1); } -static void sigalrm_handler(int signal, short events, void *data) { - logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s signal", strsignal(signal)); +static void sigalrm_handler(void *data) { + logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s signal", strsignal(((signal_t *)data)->signum)); retry(); } +#endif int reload_configuration(void) { - char *fname; + char fname[PATH_MAX]; /* Reread our own configuration file */ @@ -232,16 +287,14 @@ int reload_configuration(void) { init_configuration(&config_tree); if(!read_server_config()) { - logger(DEBUG_ALWAYS, LOG_ERR, "Unable to reread configuration file, exitting."); - event_loopexit(NULL); + logger(DEBUG_ALWAYS, LOG_ERR, "Unable to reread configuration file."); return EINVAL; } read_config_options(config_tree, NULL); - xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, myself->name); - read_config_file(config_tree, fname); - free(fname); + snprintf(fname, sizeof fname, "%s" SLASH "hosts" SLASH "%s", confbase, myself->name); + read_config_file(config_tree, fname); /* Parse some options that are allowed to be changed while tinc is running */ @@ -251,11 +304,19 @@ int reload_configuration(void) { if(strictsubnets) { for splay_each(subnet_t, subnet, subnet_tree) - subnet->expires = 1; + if (subnet->owner) + subnet->expires = 1; + } + + for splay_each(node_t, n, node_tree) + n->status.has_address = false; - load_all_subnets(); + load_all_nodes(); + if(strictsubnets) { for splay_each(subnet_t, subnet, subnet_tree) { + if (!subnet->owner) + continue; if(subnet->expires == 1) { send_del_subnet(everyone, subnet); if(subnet->owner->status.reachable) @@ -306,7 +367,7 @@ int reload_configuration(void) { } /* Try to make outgoing connections */ - + try_outgoing_connections(); /* Close connections to hosts that have a changed or deleted host config file */ @@ -315,71 +376,74 @@ int reload_configuration(void) { if(c->status.control) continue; - xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name); + snprintf(fname, sizeof 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); + terminate_connection(c, c->edge); } - free(fname); } - last_config_check = time(NULL); + last_config_check = now.tv_sec; return 0; } void retry(void) { + /* Reset the reconnection timers for all outgoing connections */ + for list_each(outgoing_t, outgoing, outgoing_list) { + outgoing->timeout = 0; + if(outgoing->ev.cb) + timeout_set(&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, connection_list) { - if(c->outgoing && !c->node) { - if(timeout_initialized(&c->outgoing->ev)) - event_del(&c->outgoing->ev); - if(c->status.connecting) - close(c->socket); - c->outgoing->timeout = 0; - terminate_connection(c, c->status.active); - } + if(c->outgoing && !c->node) + c->last_ping_time = 0; } + + /* Kick the ping timeout handler */ + timeout_set(&pingtimer, &(struct timeval){0, 0}); } /* this is where it all happens... */ int main_loop(void) { - struct event timeout_event; - - timeout_set(&timeout_event, timeout_handler, &timeout_event); - event_add(&timeout_event, &(struct timeval){pingtimeout, 0}); + last_periodic_run_time = now; + timeout_add(&pingtimer, timeout_handler, &pingtimer, &(struct timeval){pingtimeout, rand() % 100000}); + timeout_add(&periodictimer, periodic_handler, &periodictimer, &(struct timeval){0, 0}); #ifndef HAVE_MINGW - struct event sighup_event; - struct event sigterm_event; - struct event sigquit_event; - struct event sigalrm_event; - - signal_set(&sighup_event, SIGHUP, sighup_handler, NULL); - signal_add(&sighup_event, NULL); - signal_set(&sigterm_event, SIGTERM, sigterm_handler, NULL); - signal_add(&sigterm_event, NULL); - signal_set(&sigquit_event, SIGQUIT, sigterm_handler, NULL); - signal_add(&sigquit_event, NULL); - signal_set(&sigalrm_event, SIGALRM, sigalrm_handler, NULL); - signal_add(&sigalrm_event, NULL); + 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(0) < 0) { - logger(DEBUG_ALWAYS, LOG_ERR, "Error while waiting for input: %s", strerror(errno)); + if(!event_loop()) { + logger(DEBUG_ALWAYS, LOG_ERR, "Error while waiting for input: %s", sockstrerror(sockerrno)); return 1; } #ifndef HAVE_MINGW - signal_del(&sighup_event); - signal_del(&sigterm_event); - signal_del(&sigquit_event); - signal_del(&sigalrm_event); + signal_del(&sighup); + signal_del(&sigterm); + signal_del(&sigquit); + signal_del(&sigint); + signal_del(&sigalrm); #endif - event_del(&timeout_event); + timeout_del(&periodictimer); + timeout_del(&pingtimer); return 0; }