X-Git-Url: https://www.tinc-vpn.org/git/browse?a=blobdiff_plain;f=src%2Fnet.c;h=8a63615d658b6321ac1df565dc708be177037f59;hb=fc119fb0096a9221f2cff279b07c886bcd794d28;hp=28fa9955b9e87c79ce871335c8030efa1110f9e3;hpb=0b8b23e0dd7219344543f135ca0aeba8a4a42d48;p=tinc diff --git a/src/net.c b/src/net.c index 28fa9955..8a63615d 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 + 2000-2013 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 @@ -29,6 +29,7 @@ #include "graph.h" #include "logger.h" #include "meta.h" +#include "names.h" #include "net.h" #include "netutl.h" #include "process.h" @@ -74,7 +75,7 @@ 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); } @@ -137,18 +138,16 @@ 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) { for list_each(connection_t, c, connection_list) { if(c->status.control) continue; - if(c->last_ping_time + pingtimeout <= now) { + if(c->last_ping_time + pingtimeout <= 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 - c->last_ping_time); - } else if(c->last_ping_time + pinginterval <= now) { + 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); continue; } else { @@ -164,6 +163,15 @@ static void timeout_handler(int fd, short events, void *event) { } } + timeout_set(data, &(struct timeval){pingtimeout, 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); @@ -179,52 +187,126 @@ 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}); -} + /* If AutoConnect is set, check if we need to make or break connections. */ + + 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++; + } + + 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; + + if(n->connection) + break; + + bool found = false; + + for list_each(outgoing_t, outgoing, outgoing_list) { + if(!strcmp(outgoing->name, n->name)) { + found = true; + break; + } + } + + 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); + } + 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; -void handle_meta_connection_data(int fd, short events, void *data) { - connection_t *c = data; - int result; - socklen_t len = sizeof result; + if(i++ != r) + continue; - if(c->status.connecting) { - c->status.connecting = false; + if(!c->outgoing || !c->node || c->node->edge_tree->count < 2) + break; - getsockopt(c->socket, SOL_SOCKET, SO_ERROR, &result, &len); + 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; + } + } - 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; + 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; + } + } + if(!found) { + logger(DEBUG_CONNECTIONS, LOG_INFO, "Cancelled outgoing connection to %s", o->name); + list_delete_node(outgoing_list, node); + } + } } } + 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; } } -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(); } -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 = NULL; /* Reread our own configuration file */ @@ -233,15 +315,15 @@ int reload_configuration(void) { if(!read_server_config()) { logger(DEBUG_ALWAYS, LOG_ERR, "Unable to reread configuration file, exitting."); - event_loopexit(NULL); + event_exit(); 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); + xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, myself->name); + read_config_file(config_tree, fname); + free(fname); /* Parse some options that are allowed to be changed while tinc is running */ @@ -306,7 +388,7 @@ 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 */ @@ -324,7 +406,7 @@ int reload_configuration(void) { free(fname); } - last_config_check = time(NULL); + last_config_check = now.tv_sec; return 0; } @@ -332,8 +414,7 @@ int reload_configuration(void) { void retry(void) { for list_each(connection_t, c, connection_list) { if(c->outgoing && !c->node) { - if(timeout_initialized(&c->outgoing->ev)) - event_del(&c->outgoing->ev); + timeout_del(&c->outgoing->ev); if(c->status.connecting) close(c->socket); c->outgoing->timeout = 0; @@ -346,40 +427,40 @@ void retry(void) { this is where it all happens... */ int main_loop(void) { - struct event timeout_event; + timeout_t pingtimer = {{0}}; + timeout_t periodictimer = {{0}}; - timeout_set(&timeout_event, timeout_handler, &timeout_event); - event_add(&timeout_event, &(struct timeval){pingtimeout, 0}); + 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 - 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) { + if(!event_loop()) { logger(DEBUG_ALWAYS, LOG_ERR, "Error while waiting for input: %s", strerror(errno)); 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(&sigalrm); + signal_del(&sigquit); + signal_del(&sigterm); #endif - event_del(&timeout_event); + timeout_del(&periodictimer); + timeout_del(&pingtimer); return 0; }