X-Git-Url: http://git.meshlink.io/?a=blobdiff_plain;f=src%2Fnet.c;h=80490efadb785ab59db7cb6e8a43e850008b9131;hb=a5a8005b2d89712e124ab7295165a3e229abdad5;hp=c7b612c743e76d24ffd5d4adcb492cf881c63db3;hpb=c2752b961c9262386b940c2c053b9909bee22859;p=meshlink diff --git a/src/net.c b/src/net.c index c7b612c7..80490efa 100644 --- a/src/net.c +++ b/src/net.c @@ -1,7 +1,6 @@ /* net.c -- most of the network code - Copyright (C) 1998-2001 Ivo Timmermans , - 2000,2001 Guus Sliepen + 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 @@ -13,1380 +12,715 @@ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - - $Id: net.c,v 1.35.4.151 2001/11/16 22:41:38 zarq Exp $ + You should have received a copy of the GNU General Public License along + with this program; if not, write to the Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ -#include "config.h" - -#include -#include -#include -#include -#ifdef HAVE_LINUX - #include - #include -#endif -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -/* SunOS really wants sys/socket.h BEFORE net/if.h, - and FreeBSD wants these lines below the rest. */ -#include -#include -#include - -#include -#include -#include - -#ifndef HAVE_RAND_PSEUDO_BYTES -#define RAND_pseudo_bytes RAND_bytes -#endif - -#include -#include -#include -#include +#include "system.h" +#include "utils.h" #include "conf.h" #include "connection.h" +#include "graph.h" +#include "logger.h" +#include "meshlink_internal.h" #include "meta.h" #include "net.h" -#include "process.h" +#include "netutl.h" #include "protocol.h" -#include "subnet.h" -#include "process.h" -#include "route.h" -#include "device.h" +#include "xalloc.h" -#include "system.h" +#include -int maxtimeout = 900; -int seconds_till_retry = 5; +#if !defined(min) +static inline int min(int a, int b) { + return a < b ? a : b; +} +#endif -int tcp_socket = -1; -int udp_socket = -1; +static const int default_timeout = 5; +static const int default_interval = 60; -int keylifetime = 0; -int keyexpires = 0; +/* + Terminate a connection: + - Mark it as inactive + - Remove the edge representing this connection + - Kill it with fire + - Check if we need to retry making an outgoing connection +*/ +void terminate_connection(meshlink_handle_t *mesh, connection_t *c, bool report) { + logger(mesh, MESHLINK_INFO, "Closing connection with %s", c->name); -int do_prune = 0; + c->status.active = false; -/* VPN packet I/O */ + if(c->node && c->node->connection == c) { + c->node->connection = NULL; + } -char *hostlookup(struct sockaddr *addr, int numericonly) -{ - char *hostname; - int flags = 0; - int r; - -cp - if(numericonly - || (get_config_bool(lookup_config(config_tree, "ResolveDNS"), &r) - || !r )) - flags |= NI_NUMERICHOST; - - hostname = xmalloc(NI_MAXHOST); - - if((r = getnameinfo(addr, sizeof(*addr), hostname, NI_MAXHOST, NULL, 0, flags)) != 0) - { - free(hostname); - if(flags & NI_NUMERICHOST) - { - syslog(LOG_ERR, _("Address conversion failed: %s"), - gai_strerror(r)); - return NULL; + if(c->edge) { + if(report) { + send_del_edge(mesh, mesh->everyone, c->edge, 0); + } + + edge_del(mesh, c->edge); + c->edge = NULL; + + /* Run MST and SSSP algorithms */ + + 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 && !c->node->status.reachable) { + edge_t *e; + e = lookup_edge(c->node, mesh->self); + + if(e) { + send_del_edge(mesh, mesh->everyone, e, 0); + edge_del(mesh, e); + } + } } - else - return hostlookup(addr, 1); - } -cp - return hostname; -} -void receive_udppacket(node_t *n, vpn_packet_t *inpkt) -{ - vpn_packet_t outpkt; - int outlen, outpad; - EVP_CIPHER_CTX ctx; -cp - /* Decrypt the packet */ - - EVP_DecryptInit(&ctx, myself->cipher, myself->key, myself->key + myself->cipher->key_len); - EVP_DecryptUpdate(&ctx, outpkt.salt, &outlen, inpkt->salt, inpkt->len); - EVP_DecryptFinal(&ctx, outpkt.salt + outlen, &outpad); - outlen += outpad; - outpkt.len = outlen - sizeof(outpkt.salt); - - receive_packet(n, &outpkt); -cp -} + outgoing_t *outgoing = c->outgoing; + connection_del(mesh, c); -void receive_tcppacket(connection_t *c, char *buffer, int len) -{ - vpn_packet_t outpkt; -cp - outpkt.len = len; - memcpy(outpkt.data, buffer, len); + /* Check if this was our outgoing connection */ - receive_packet(c->node, &outpkt); -cp -} + if(outgoing) { + do_outgoing_connection(mesh, outgoing); + } -void receive_packet(node_t *n, vpn_packet_t *packet) -{ -cp - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_DEBUG, _("Received packet of %d bytes from %s (%s)"), packet->len, n->name, n->hostname); +#ifndef HAVE_MINGW + /* Clean up dead proxy processes */ - route_incoming(n, packet); -cp -} + while(waitpid(-1, NULL, WNOHANG) > 0); -void send_udppacket(node_t *n, vpn_packet_t *inpkt) -{ - vpn_packet_t outpkt; - int outlen, outpad; - EVP_CIPHER_CTX ctx; - vpn_packet_t *copy; -cp - if(!n->status.validkey) - { - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_INFO, _("No valid key known yet for %s (%s), queueing packet"), - n->name, n->hostname); - - /* Since packet is on the stack of handle_tap_input(), - we have to make a copy of it first. */ - - copy = xmalloc(sizeof(vpn_packet_t)); - memcpy(copy, inpkt, sizeof(vpn_packet_t)); - - list_insert_tail(n->queue, copy); - - if(!n->status.waitingforkey) - send_req_key(n->nexthop->connection, myself, n); - return; - } - - /* Encrypt the packet. */ - - RAND_pseudo_bytes(inpkt->salt, sizeof(inpkt->salt)); - - EVP_EncryptInit(&ctx, n->cipher, n->key, n->key + n->cipher->key_len); - EVP_EncryptUpdate(&ctx, outpkt.salt, &outlen, inpkt->salt, inpkt->len + sizeof(inpkt->salt)); - EVP_EncryptFinal(&ctx, outpkt.salt + outlen, &outpad); - outlen += outpad; - - if((sendto(udp_socket, (char *) outpkt.salt, outlen, 0, n->address->ai_addr, n->address->ai_addrlen)) < 0) - { - syslog(LOG_ERR, _("Error sending packet to %s (%s): %m"), - n->name, n->hostname); - return; - } -cp +#endif } /* - send a packet to the given vpn ip. + Check if the other end is active. + If we have sent packets, but didn't receive any, + then possibly the other end is dead. We send a + PING request over the meta connection. If the other + end does not reply in time, we consider them dead + and close the connection. */ -void send_packet(node_t *n, vpn_packet_t *packet) -{ -cp - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_ERR, _("Sending packet of %d bytes to %s (%s)"), - packet->len, n->name, n->hostname); - - if(n == myself) - { - if(debug_lvl >= DEBUG_TRAFFIC) - { - syslog(LOG_NOTICE, _("Packet is looping back to us!")); - } - - return; - } - - if(n->via != n && debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_ERR, _("Sending packet to %s via %s (%s)"), - n->name, n->via->name, n->via->hostname); - - if((myself->options | n->via->options) & OPTION_TCPONLY) - { - if(send_tcppacket(n->via->connection, packet)) - terminate_connection(n->via->connection, 1); - } - else - send_udppacket(n->via, packet); +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; + + // 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 <= mesh->loop.now.tv_sec) { + if(c->status.active) { + if(c->status.pinged) { + 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(mesh, MESHLINK_WARNING, "Timeout while connecting to %s", c->name); + } else { + logger(mesh, MESHLINK_WARNING, "Timeout from %s during authentication", c->name); + } + } + + terminate_connection(mesh, c, c->status.active); + } + } + + timeout_set(&mesh->loop, data, &(struct timeval) { + default_timeout, prng(mesh, TIMER_FUDGE) + }); } -/* Broadcast a packet to all active direct connections */ +// 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; -void broadcast_packet(node_t *from, vpn_packet_t *packet) -{ - avl_node_t *node; - connection_t *c; -cp - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_INFO, _("Broadcasting packet of %d bytes from %s (%s)"), - packet->len, from->name, from->hostname); - - for(node = connection_tree->head; node; node = node->next) - { - c = (connection_t *)node->data; - if(c->status.active && c != from->nexthop->connection) - send_packet(c->node, packet); - } -cp -} + if(na->devclass < nb->devclass) { + return -1; + } -void flush_queue(node_t *n) -{ - list_node_t *node, *next; -cp - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_INFO, _("Flushing queue for %s (%s)"), n->name, n->hostname); - - for(node = n->queue->head; node; node = next) - { - next = node->next; - send_udppacket(n, (vpn_packet_t *)node->data); - list_delete_node(n->queue, node); - } -cp -} + if(na->devclass > nb->devclass) { + return 1; + } -/* Setup sockets */ + if(na->last_successfull_connection == nb->last_successfull_connection) { + return 0; + } -int setup_listen_socket(node_t *n) -{ - int nfd, flags; - int option; - char *address; - int r; - struct addrinfo hints, *ai, *aitop; - int ipv6preferred; -#ifdef HAVE_LINUX - char *interface; -#endif + if(na->last_successfull_connection == 0 || na->last_successfull_connection > nb->last_successfull_connection) { + return -1; + } -cp - - if(!get_config_string(lookup_config(config_tree, "BindToAddress"), &address)) - { - address = NULL; - } - - hints.ai_socktype = SOCK_STREAM; - hints.ai_protocol = IPPROTO_TCP; - hints.ai_family = AF_INET; - if(get_config_bool(lookup_config(config_tree, "IPv6Preferred"), &ipv6preferred)) - { - if(ipv6preferred) - hints.ai_family = PF_UNSPEC; - } - if((r = getaddrinfo(address, n->port, &hints, &aitop)) != 0) - { - syslog(LOG_ERR, _("Looking up `%s' failed: %s\n"), - address, gai_strerror(r)); - return -1; - } - - /* Try to create a listening socket for all alternatives we got from - getaddrinfo. */ - for(ai = aitop; ai != NULL; ai = ai->ai_next) - { - if((nfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol)) < 0) - { - syslog(LOG_ERR, _("Creating metasocket failed: %m")); - continue; + if(nb->last_successfull_connection == 0 || na->last_successfull_connection < nb->last_successfull_connection) { + return 1; } - - flags = fcntl(nfd, F_GETFL); - if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) - { - close(nfd); - syslog(LOG_ERR, _("System call `%s' failed: %m"), - "fcntl"); - continue; + + if(na < nb) { + return -1; } - - /* Optimize TCP settings */ - - option = 1; - setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option)); - setsockopt(nfd, SOL_SOCKET, SO_KEEPALIVE, &option, sizeof(option)); -#ifdef HAVE_LINUX - setsockopt(nfd, SOL_TCP, TCP_NODELAY, &option, sizeof(option)); - - option = IPTOS_LOWDELAY; - setsockopt(nfd, SOL_IP, IP_TOS, &option, sizeof(option)); - - if(get_config_string(lookup_config(config_tree, "BindToInterface"), &interface)) - if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, interface, strlen(interface))) - { - close(nfd); - syslog(LOG_ERR, _("Can't bind to interface %s: %m"), interface); - continue; - } -#endif - if(bind(nfd, ai->ai_addr, ai->ai_addrlen)) - { - close(nfd); - syslog(LOG_ERR, _("Can't bind to %s port %s/tcp: %m"), - ai->ai_canonname, n->port); - continue; + if(na > nb) { + return 1; } - - if(listen(nfd, 3)) - { - close(nfd); - syslog(LOG_ERR, _("System call `%s' failed: %m"), - "listen"); - continue; + + 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; } - break; /* We have successfully bound to a socket */ - } + 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(ai == NULL) /* None of the alternatives succeeded */ - { - syslog(LOG_ERR, _("Failed to open a listening socket.")); - return -1; - } -cp - return nfd; + if(na < nb) { + return -1; + } + + if(na > nb) { + return 1; + } + + return 0; } -int setup_vpn_in_socket(node_t *n) -{ - const int one = 1; - int nfd, flags; - int option; - char *address; - int r; - struct addrinfo hints, *ai, *aitop; - int ipv6preferred; -#ifdef HAVE_LINUX - char *interface; -#endif +// devclass desc +static int node_compare_devclass_desc(const void *a, const void *b) { + const node_t *na = a, *nb = b; -cp - - if(!get_config_string(lookup_config(config_tree, "BindToAddress"), &address)) - { - address = NULL; - } - - hints.ai_socktype = SOCK_DGRAM; - hints.ai_protocol = IPPROTO_UDP; - hints.ai_family = AF_INET; - if(get_config_bool(lookup_config(config_tree, "IPv6Preferred"), &ipv6preferred)) - { - if(ipv6preferred) - hints.ai_family = PF_UNSPEC; - } - if((r = getaddrinfo(address, n->port, &hints, &aitop)) != 0) - { - syslog(LOG_ERR, _("Looking up `%s' failed: %s\n"), - address, gai_strerror(r)); - return -1; - } - - setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)); - - /* Try to create a listening socket for all alternatives we got from - getaddrinfo. */ - for(ai = aitop; ai != NULL; ai = ai->ai_next) - { - if((nfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol)) < 0) - { - syslog(LOG_ERR, _("Creating metasocket failed: %m")); - continue; + if(na->devclass < nb->devclass) { + return -1; } - - flags = fcntl(nfd, F_GETFL); - if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) - { - close(nfd); - syslog(LOG_ERR, _("System call `%s' failed: %m"), - "fcntl"); - continue; + + if(na->devclass > nb->devclass) { + return 1; } - - /* Optimize UDP settings */ - - option = 1; - setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option)); -#ifdef HAVE_LINUX - if(get_config_string(lookup_config(config_tree, "BindToInterface"), &interface)) - if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, interface, strlen(interface))) - { - close(nfd); - syslog(LOG_ERR, _("Can't bind to interface %s: %m"), interface); - continue; - } -#endif - if(bind(nfd, ai->ai_addr, ai->ai_addrlen)) - { - close(nfd); - syslog(LOG_ERR, _("Can't bind to %s port %s/tcp: %m"), - ai->ai_canonname, n->port); - continue; + if(na < nb) { + return -1; } - - break; /* We have successfully bound to a socket */ - } - - if(ai == NULL) /* None of the alternatives succeeded */ - { - syslog(LOG_ERR, _("Failed to open a listening socket.")); - return -1; - } -cp - return nfd; + + if(na > nb) { + return 1; + } + + return 0; } -int setup_outgoing_socket(connection_t *c) + +/* + +autoconnect() { - int flags; -cp - if(debug_lvl >= DEBUG_CONNECTIONS) - syslog(LOG_INFO, _("Trying to connect to %s (%s)"), c->name, c->hostname); + timeout = 5 - c->socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); + // find the best one for initial connect - if(c->socket == -1) - { - syslog(LOG_ERR, _("Creating socket for %s port %s failed: %m"), - c->hostname, c->port); - return -1; - } + 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 - /* Bind first to get a fix on our source port??? - a.sin_family = AF_INET; - a.sin_port = htons(0); - a.sin_addr.s_addr = htonl(INADDR_ANY); + // 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(bind(c->socket, (struct sockaddr *)&a, sizeof(struct sockaddr))) - { - close(c->socket); - syslog(LOG_ERR, _("System call `%s' failed: %m"), "bind"); - return -1; - } + 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 - */ - /* Optimize TCP settings? + // heal partitions - option = 1; - setsockopt(c->socket, SOL_SOCKET, SO_KEEPALIVE, &option, sizeof(option)); -#ifdef HAVE_LINUX - setsockopt(c->socket, SOL_TCP, TCP_NODELAY, &option, sizeof(option)); + 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 - option = IPTOS_LOWDELAY; - setsockopt(c->socket, SOL_IP, IP_TOS, &option, sizeof(option)); -#endif - */ + // connect - /* Connect */ +connect: + if newcon + connect newcon - if(connect(c->socket, c->address->ai_addr, c->address->ai_addrlen) == -1) - { - close(c->socket); - syslog(LOG_ERR, _("%s port %s: %m"), c->hostname, c->port); - return -1; - } - flags = fcntl(c->socket, F_GETFL); + // 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(fcntl(c->socket, F_SETFL, flags | O_NONBLOCK) < 0) - { - close(c->socket); - syslog(LOG_ERR, _("fcntl for %s port %s: %m"), - c->hostname, c->port); - return -1; - } + 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 - if(debug_lvl >= DEBUG_CONNECTIONS) - syslog(LOG_INFO, _("Connected to %s port %s"), - c->hostname, c->port); -cp - return 0; -} -int setup_outgoing_connection(char *name) -{ - connection_t *c; - node_t *n; - struct addrinfo *ai, *aitop, hints; - int r, ipv6preferred; - -cp - n = lookup_node(name); - - if(n) - if(n->connection) - { - if(debug_lvl >= DEBUG_CONNECTIONS) - syslog(LOG_INFO, _("Already connected to %s"), name); - return 0; - } - - c = new_connection(); - c->name = xstrdup(name); - - init_configuration(&c->config_tree); - read_connection_config(c); - - if(!get_config_string(lookup_config(c->config_tree, "Address"), &c->hostname)) - { - syslog(LOG_ERR, _("No address specified for %s"), c->name); - free_connection(c); - return -1; - } - - if(!get_config_string(lookup_config(c->config_tree, "Port"), &c->port)) - { - syslog(LOG_ERR, _("No port specified for %s"), c->name); - free_connection(c); - return -1; - } - - hints.ai_socktype = SOCK_STREAM; - hints.ai_family = AF_INET; - if(get_config_bool(lookup_config(c->config_tree, "IPv6Preferred"), &ipv6preferred)) - { - if(ipv6preferred) - hints.ai_family = PF_UNSPEC; - } - - if((r = getaddrinfo(c->hostname, c->port, &hints, &aitop)) != 0) - { - syslog(LOG_ERR, _("Looking up %s failed: %s\n"), - c->hostname, gai_strerror(r)); - return -1; - } - - for(ai = aitop; ai != NULL; ai = ai->ai_next) - { - if(setup_outgoing_socket(c) < 0) - continue; - } - - if(ai == NULL) - { - /* No connection alternative succeeded */ - free_connection(c); - return -1; - } - - c->status.outgoing = 1; - c->last_ping_time = time(NULL); - - connection_add(c); - - send_id(c); -cp - return 0; -} + // disconnect connections in case we have more than enough connections -int read_rsa_public_key(connection_t *c) -{ - FILE *fp; - char *fname; - char *key; -cp - if(!c->rsa_key) - c->rsa_key = RSA_new(); - - /* First, check for simple PublicKey statement */ - - if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &key)) - { - BN_hex2bn(&c->rsa_key->n, key); - BN_hex2bn(&c->rsa_key->e, "FFFF"); - return 0; - } - - /* Else, check for PublicKeyFile statement and read it */ - - if(get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname)) - { - if(is_safe_path(fname)) - { - if((fp = fopen(fname, "r")) == NULL) - { - syslog(LOG_ERR, _("Error reading RSA public key file `%s': %m"), - fname); - return -1; - } - c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL); - fclose(fp); - if(!c->rsa_key) - { - syslog(LOG_ERR, _("Reading RSA public key file `%s' failed: %m"), - fname); - return -1; - } - return 0; - } - else - return -1; - } - - /* Else, check if a harnessed public key is in the config file */ - - asprintf(&fname, "%s/hosts/%s", confbase, c->name); - if((fp = fopen(fname, "r"))) - { - c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL); - fclose(fp); - } - - free(fname); - - if(c->rsa_key) - return 0; - else - { - syslog(LOG_ERR, _("No public key for %s specified!"), c->name); - return -1; - } -} + if max < cur + delcon = + first from nodes + where outgoing_connection + order by dclass desc + goto disconnect -int read_rsa_private_key(void) -{ - FILE *fp; - char *fname, *key; -cp - if(get_config_string(lookup_config(config_tree, "PrivateKey"), &key)) - { - myself->connection->rsa_key = RSA_new(); - BN_hex2bn(&myself->connection->rsa_key->d, key); - BN_hex2bn(&myself->connection->rsa_key->e, "FFFF"); - } - else if(get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname)) - { - if((fp = fopen(fname, "r")) == NULL) - { - syslog(LOG_ERR, _("Error reading RSA private key file `%s': %m"), - fname); - return -1; - } - myself->connection->rsa_key = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL); - fclose(fp); - if(!myself->connection->rsa_key) - { - syslog(LOG_ERR, _("Reading RSA private key file `%s' failed: %m"), - fname); - return -1; - } - } - else - { - syslog(LOG_ERR, _("No private key for tinc daemon specified!")); - return -1; - } -cp - return 0; -} + // disconnect -/* - Configure node_t myself and set up the local sockets (listen only) -*/ -int setup_myself(void) -{ - config_t *cfg; - subnet_t *subnet; - char *name, *mode; - int choice; -cp - myself = new_node(); - myself->connection = new_connection(); - init_configuration(&myself->connection->config_tree); - - asprintf(&myself->hostname, _("MYSELF")); - asprintf(&myself->connection->hostname, _("MYSELF")); - - myself->connection->options = 0; - myself->connection->protocol_version = PROT_CURRENT; - - if(!get_config_string(lookup_config(config_tree, "Name"), &name)) /* Not acceptable */ - { - syslog(LOG_ERR, _("Name for tinc daemon required!")); - return -1; - } - - if(check_id(name)) - { - syslog(LOG_ERR, _("Invalid name for myself!")); - free(name); - return -1; - } - - myself->name = name; - myself->connection->name = xstrdup(name); - -cp - if(read_rsa_private_key()) - return -1; - - if(read_connection_config(myself->connection)) - { - syslog(LOG_ERR, _("Cannot open host configuration file for myself!")); - return -1; - } - - if(read_rsa_public_key(myself->connection)) - return -1; -cp +disconnect + if delcon + disconnect delcon -/* - if(RSA_check_key(rsa_key) != 1) - { - syslog(LOG_ERR, _("Invalid public/private keypair!")); - return -1; - } -*/ - if(!get_config_string(lookup_config(myself->connection->config_tree, "Port"), &myself->port)) - myself->port = "655"; - - myself->connection->port = myself->port; - -/* Read in all the subnets specified in the host configuration file */ - - cfg = lookup_config(myself->connection->config_tree, "Subnet"); - - while(cfg) - { - if(!get_config_subnet(cfg, &subnet)) - return -1; - - subnet_add(myself, subnet); - - cfg = lookup_config_next(myself->connection->config_tree, cfg); - } - -cp - /* Check some options */ - - if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice)) - if(choice) - myself->options |= OPTION_INDIRECT; - - if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice)) - if(choice) - myself->options |= OPTION_TCPONLY; - - if(get_config_bool(lookup_config(myself->connection->config_tree, "IndirectData"), &choice)) - if(choice) - myself->options |= OPTION_INDIRECT; - - if(get_config_bool(lookup_config(myself->connection->config_tree, "TCPOnly"), &choice)) - if(choice) - myself->options |= OPTION_TCPONLY; - - if(myself->options & OPTION_TCPONLY) - myself->options |= OPTION_INDIRECT; - - if(get_config_string(lookup_config(config_tree, "Mode"), &mode)) - { - if(!strcasecmp(mode, "router")) - routing_mode = RMODE_ROUTER; - else if (!strcasecmp(mode, "switch")) - routing_mode = RMODE_SWITCH; - else if (!strcasecmp(mode, "hub")) - routing_mode = RMODE_HUB; - else - { - syslog(LOG_ERR, _("Invalid routing mode!")); - return -1; - } - } - else - routing_mode = RMODE_ROUTER; - -cp - /* Open sockets */ - - if((tcp_socket = setup_listen_socket(myself)) < 0) - { - syslog(LOG_ERR, _("Unable to set up a listening TCP socket!")); - return -1; - } - - if((udp_socket = setup_vpn_in_socket(myself)) < 0) - { - syslog(LOG_ERR, _("Unable to set up a listening UDP socket!")); - return -1; - } -cp - /* Generate packet encryption key */ - - myself->cipher = EVP_bf_cbc(); - - myself->keylength = myself->cipher->key_len + myself->cipher->iv_len; - - myself->key = (char *)xmalloc(myself->keylength); - RAND_pseudo_bytes(myself->key, myself->keylength); - - if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime)) - keylifetime = 3600; - - keyexpires = time(NULL) + keylifetime; -cp - /* Done */ - - myself->nexthop = myself; - myself->via = myself; - myself->status.active = 1; - node_add(myself); - - syslog(LOG_NOTICE, _("Ready: listening on port %s"), myself->port); -cp - return 0; -} -/* - setup all initial network connections -*/ -int setup_network_connections(void) -{ -cp - init_connections(); - init_subnets(); - init_nodes(); - init_edges(); - - if(get_config_int(lookup_config(config_tree, "PingTimeout"), &timeout)) - { - if(timeout < 1) - { - timeout = 86400; - } - } - else - timeout = 60; - - if(setup_device() < 0) - return -1; - - /* Run tinc-up script to further initialize the tap interface */ - execute_script("tinc-up"); - - if(setup_myself() < 0) - return -1; - - signal(SIGALRM, try_outgoing_connections); - alarm(5); -cp - return 0; -} + // next iteration + next (timeout, autoconnect) -/* - close all open network connections -*/ -void close_network_connections(void) -{ - avl_node_t *node, *next; - connection_t *c; -cp - for(node = connection_tree->head; node; node = next) - { - next = node->next; - c = (connection_t *)node->data; - c->status.outgoing = 0; - terminate_connection(c, 0); - } - - terminate_connection(myself->connection, 0); - - close(udp_socket); - close(tcp_socket); - - exit_edges(); - exit_subnets(); - exit_nodes(); - exit_connections(); - - execute_script("tinc-down"); - - close_device(); -cp - return; } -/* - handle an incoming tcp connect call and open - a connection to it. */ -connection_t *create_new_connection(int sfd) -{ - connection_t *c; - struct sockaddr_in ci; - int len = sizeof(ci); -cp - c = new_connection(); - - if(getpeername(sfd, (struct sockaddr *) &ci, (socklen_t *) &len) < 0) - { - syslog(LOG_ERR, _("System call `%s' failed: %m"), - "getpeername"); - close(sfd); - return NULL; - } - - c->address = sockaddr_to_addrinfo(ci); - - c->hostname = xmalloc(INET6_ADDRSTRLEN); - if((inet_ntop(ci.sin_family, &(ci.sin_addr), c->hostname, INET6_ADDRSTRLEN)) == NULL) - { - syslog(LOG_ERR, _("Couldn't convert address to string: %m")); - free(c->hostname); - return NULL; - } - asprintf(&(c->port), "%d", htons(ci.sin_port)); - c->socket = sfd; - c->last_ping_time = time(NULL); - - if(debug_lvl >= DEBUG_CONNECTIONS) - syslog(LOG_NOTICE, _("Connection from %s port %s"), - c->hostname, c->port); - - c->allow_request = ID; -cp - return c; -} -/* - put all file descriptors in an fd_set array -*/ -void build_fdset(fd_set *fs) -{ - avl_node_t *node; - connection_t *c; -cp - FD_ZERO(fs); - - for(node = connection_tree->head; node; node = node->next) - { - c = (connection_t *)node->data; - FD_SET(c->socket, fs); - } - - FD_SET(tcp_socket, fs); - FD_SET(udp_socket, fs); - FD_SET(device_fd, fs); -cp -} -/* - receive incoming data from the listening - udp socket and write it to the ethertap - device after being decrypted -*/ -void handle_incoming_vpn_data(void) -{ - vpn_packet_t pkt; - int x, l = sizeof(x); - struct sockaddr_in from; - socklen_t fromlen = sizeof(from); - node_t *n; -cp - if(getsockopt(udp_socket, SOL_SOCKET, SO_ERROR, &x, &l) < 0) - { - syslog(LOG_ERR, _("This is a bug: %s:%d: %d:%m"), - __FILE__, __LINE__, udp_socket); - return; - } - if(x) - { - syslog(LOG_ERR, _("Incoming data socket error: %s"), strerror(x)); - return; - } - - if((pkt.len = recvfrom(udp_socket, (char *) pkt.salt, MTU, 0, (struct sockaddr *)&from, &fromlen)) <= 0) - { - syslog(LOG_ERR, _("Receiving packet failed: %m")); - return; - } - - n = lookup_node_udp(sockaddr_to_addrinfo(&from)); - - if(!n) - { - syslog(LOG_WARNING, _("Received UDP packet on port %s from unknown source %x:%hd"), myself->port, ntohl(from.sin_addr.s_addr), ntohs(from.sin_port)); - return; - } -/* - if(n->connection) - n->connection->last_ping_time = time(NULL); -*/ - receive_udppacket(n, &pkt); -cp -} +static void periodic_handler(event_loop_t *loop, void *data) { + meshlink_handle_t *mesh = loop->data; -/* - Terminate a connection: - - Close the socket - - Remove associated edge and tell other connections about it if report = 1 - - Check if we need to retry making an outgoing connection - - Deactivate the host -*/ -void terminate_connection(connection_t *c, int report) -{ - avl_node_t *node; - connection_t *other; -cp - if(c->status.remove) - return; - - if(debug_lvl >= DEBUG_CONNECTIONS) - syslog(LOG_NOTICE, _("Closing connection with %s (%s)"), - c->name, c->hostname); - - c->status.remove = 1; - - if(c->socket) - close(c->socket); - - if(c->edge) - { - if(report) - { - for(node = connection_tree->head; node; node = node->next) - { - other = (connection_t *)node->data; - if(other->status.active && other != c) - send_del_edge(other, c->edge); - } - } - - edge_del(c->edge); - } - - /* Check if this was our outgoing connection */ - - if(c->status.outgoing) - { - c->status.outgoing = 0; - signal(SIGALRM, try_outgoing_connections); - alarm(seconds_till_retry); - syslog(LOG_NOTICE, _("Trying to re-establish outgoing connection in %d seconds"), seconds_till_retry); - } - - /* Deactivate */ - - c->status.active = 0; - if(c->node) - c->node->connection = NULL; - do_prune = 1; -cp -} + /* 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. + */ -/* - Check if the other end is active. - If we have sent packets, but didn't receive any, - then possibly the other end is dead. We send a - PING request over the meta connection. If the other - end does not reply in time, we consider them dead - and close the connection. -*/ -void check_dead_connections(void) -{ - time_t now; - avl_node_t *node, *next; - connection_t *c; -cp - now = time(NULL); - - for(node = connection_tree->head; node; node = next) - { - next = node->next; - c = (connection_t *)node->data; - if(c->last_ping_time + timeout < now) - { - if(c->status.active) - { - if(c->status.pinged) - { - if(debug_lvl >= DEBUG_PROTOCOL) - syslog(LOG_INFO, _("%s (%s) didn't respond to PING"), - c->name, c->hostname); - c->status.timeout = 1; - terminate_connection(c, 1); - } - else - { - send_ping(c); - } - } - else - { - if(debug_lvl >= DEBUG_CONNECTIONS) - syslog(LOG_WARNING, _("Timeout from %s (%s) during authentication"), - c->name, c->hostname); - terminate_connection(c, 0); - } - } - } -cp -} + 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; -/* - accept a new tcp connect and create a - new connection -*/ -int handle_new_meta_connection() -{ - connection_t *new; - struct sockaddr client; - int fd, len = sizeof(client); -cp - if((fd = accept(tcp_socket, &client, &len)) < 0) - { - syslog(LOG_ERR, _("Accepting a new connection failed: %m")); - return -1; - } - - if(!(new = create_new_connection(fd))) - { - shutdown(fd, 2); - close(fd); - syslog(LOG_NOTICE, _("Closed attempted connection")); - return 0; - } - - connection_add(new); - - send_id(new); -cp - return 0; -} + if(mesh->sleeptime < 0) { + mesh->sleeptime = 3600; + } + } else { + mesh->sleeptime /= 2; -void randomized_alarm(int seconds) -{ - unsigned char r; - RAND_pseudo_bytes(&r, 1); - alarm((seconds * (int)r) / 128 + 1); -} + if(mesh->sleeptime < 10) { + mesh->sleeptime = 10; + } + } -/* This function is severely fucked up. - We want to redesign it so the following rules apply: - - - Try all ConnectTo's in a row: - - if a connect() fails, try next one immediately, - - if it works, wait 5 seconds or so. - - If none of them were succesful, increase delay and retry. - - If all were succesful, don't try anymore. -*/ + mesh->contradicting_add_edge = 0; + mesh->contradicting_del_edge = 0; -RETSIGTYPE -try_outgoing_connections(int a) -{ - static config_t *cfg = NULL; - static int retry = 0; - char *name; -cp - if(!cfg) - cfg = lookup_config(config_tree, "ConnectTo"); - - if(!cfg) - return; - - while(cfg) - { - get_config_string(cfg, &name); - - if(check_id(name)) - { - syslog(LOG_ERR, _("Invalid name for outgoing connection in %s line %d"), cfg->file, cfg->line); - continue; - } - - if(setup_outgoing_connection(name)) /* function returns 0 when there are no problems */ - retry = 1; - - cfg = lookup_config_next(config_tree, cfg); /* Next time skip to next ConnectTo line */ - } - - get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout); - - if(retry) - { - seconds_till_retry += 5; - if(seconds_till_retry > maxtimeout) /* Don't wait more than MAXTIMEOUT seconds. */ - seconds_till_retry = maxtimeout; - - syslog(LOG_ERR, _("Failed to setup any outgoing connection, will retry in %d seconds"), - seconds_till_retry); - - /* Randomize timeout to avoid global synchronisation effects */ - randomized_alarm(seconds_till_retry); - } - else - { - seconds_till_retry = 5; - } -cp + int timeout = default_timeout; + + /* Check if we need to make or break connections. */ + + if(mesh->nodes->count > 1) { + + logger(mesh, MESHLINK_DEBUG, "--- autoconnect begin ---"); + + 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; + } + } + + logger(mesh, MESHLINK_DEBUG, "* cur_connects = %d", cur_connects); + logger(mesh, MESHLINK_DEBUG, "* outgoings = %d", mesh->outgoings->count); + + // get min_connects and max_connects + + unsigned int min_connects = mesh->dev_class_traits[mesh->devclass].min_connects; + unsigned int max_connects = mesh->dev_class_traits[mesh->devclass].max_connects; + + 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(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); + } + } + + if(nodes->head) { + //timeout = 0; + connect_to = (node_t *)nodes->head->data; + + 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); + } + + + // 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(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"); + } + } + + + // heal partitions + + 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); + + 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); + } + } + + 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"); + } + + splay_delete_tree(nodes); + } + + + // perform connect + + 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); + + /* check if there is already a connection attempt to this node */ + bool skip = false; + + 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; + } + } + + 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; + } + + 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); + } + } + + + // disconnect suboptimal outgoing connections + + if(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(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"); + } + } + + + // disconnect connections (too many connections) + + 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(nodes->head) { + logger(mesh, MESHLINK_DEBUG, "* disconnect connection (too many connections)"); + + //timeout = 0; + disconnect_from = (node_t *)nodes->head->data; + } else { + logger(mesh, MESHLINK_DEBUG, "* no node we want to disconnect, even though we have too many connections"); + } + + splay_delete_tree(nodes); + } + + + // 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); + } + + // reduce timeout if we don't have enough connections + outgoings + if(cur_connects + mesh->outgoings->count < 3) { + timeout = 1; + } + + // done! + + logger(mesh, MESHLINK_DEBUG, "--- autoconnect end ---"); + } + + for splay_each(node_t, n, mesh->nodes) { + if(n->status.dirty) { + node_write_config(mesh, n); + n->status.dirty = false; + } + } + + timeout_set(&mesh->loop, data, &(struct timeval) { + timeout, prng(mesh, TIMER_FUDGE) + }); } -/* - check all connections to see if anything - happened on their sockets -*/ -void check_network_activity(fd_set *f) -{ - connection_t *c; - avl_node_t *node; -cp - if(FD_ISSET(udp_socket, f)) - handle_incoming_vpn_data(); - - for(node = connection_tree->head; node; node = node->next) - { - c = (connection_t *)node->data; - - if(c->status.remove) - return; - - if(FD_ISSET(c->socket, f)) - if(receive_meta(c) < 0) - { - terminate_connection(c, c->status.active); - return; - } - } - - if(FD_ISSET(tcp_socket, f)) - handle_new_meta_connection(); -cp +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 prune_connections(void) -{ - connection_t *c; - avl_node_t *node, *next; -cp - for(node = connection_tree->head; node; node = next) - { - next = node->next; - c = (connection_t *)node->data; - - if(c->status.remove) - connection_del(c); - } -cp +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 + }); + } + +#ifdef HAVE_IFADDRS_H + struct ifaddrs *ifa = NULL; + getifaddrs(&ifa); +#endif + + /* 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; + } + +#ifdef HAVE_IFADDRS_H + + if(!ifa) { + continue; + } + + sockaddr_t sa; + socklen_t salen = sizeof(sa); + + if(getsockname(c->socket, &sa.sa, &salen)) { + continue; + } + + bool found = false; + + for(struct ifaddrs *ifap = ifa; ifap; ifap = ifap->ifa_next) { + if(ifap->ifa_addr && !sockaddrcmp_noport(&sa, (sockaddr_t *)ifap->ifa_addr)) { + found = true; + break; + } + + } + + if(!found) { + logger(mesh, MESHLINK_DEBUG, "Local address for connection to %s no longer valid, terminating", c->name); + terminate_connection(mesh, c, c->status.active); + } + +#endif + } + +#ifdef HAVE_IFADDRS_H + + if(ifa) { + freeifaddrs(ifa); + } + +#endif + + /* Kick the ping timeout handler */ + timeout_set(&mesh->loop, &mesh->pingtimer, &(struct timeval) { + 0, 0 + }); } /* this is where it all happens... */ -void main_loop(void) -{ - fd_set fset; - struct timeval tv; - int r; - time_t last_ping_check; - int t; - vpn_packet_t packet; -cp - last_ping_check = time(NULL); - - for(;;) - { - tv.tv_sec = timeout; - tv.tv_usec = 0; - - if(do_prune) - { - prune_connections(); - do_prune = 0; - } - - build_fdset(&fset); - - if((r = select(FD_SETSIZE, &fset, NULL, NULL, &tv)) < 0) - { - if(errno != EINTR) /* because of alarm */ - { - syslog(LOG_ERR, _("Error while waiting for input: %m")); - return; - } - } - - if(sighup) - { - syslog(LOG_INFO, _("Rereading configuration file and restarting in 5 seconds")); - sighup = 0; - close_network_connections(); - exit_configuration(&config_tree); - - if(read_server_config()) - { - syslog(LOG_ERR, _("Unable to reread configuration file, exiting")); - exit(1); - } - - sleep(5); - - if(setup_network_connections()) - return; - - continue; - } - - t = time(NULL); - - /* Let's check if everybody is still alive */ - - if(last_ping_check + timeout < t) - { - check_dead_connections(); - last_ping_check = time(NULL); - - /* Should we regenerate our key? */ - - if(keyexpires < t) - { - if(debug_lvl >= DEBUG_STATUS) - syslog(LOG_INFO, _("Regenerating symmetric key")); - - RAND_pseudo_bytes(myself->key, myself->keylength); - send_key_changed(myself->connection, myself); - keyexpires = time(NULL) + keylifetime; - } +int main_loop(meshlink_handle_t *mesh) { + timeout_add(&mesh->loop, &mesh->pingtimer, timeout_handler, &mesh->pingtimer, &(struct timeval) { + default_timeout, prng(mesh, TIMER_FUDGE) + }); + 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, 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)); + abort(); + signal_del(&mesh->loop, &mesh->datafromapp); + timeout_del(&mesh->loop, &mesh->periodictimer); + timeout_del(&mesh->loop, &mesh->pingtimer); + + return 1; } - if(r > 0) - { - check_network_activity(&fset); - - /* local tap data */ - if(FD_ISSET(device_fd, &fset)) - { - if(read_packet(&packet)) - return; - else - route_outgoing(&packet); - } - } - } -cp + signal_del(&mesh->loop, &mesh->datafromapp); + timeout_del(&mesh->loop, &mesh->periodictimer); + timeout_del(&mesh->loop, &mesh->pingtimer); + + return 0; }