X-Git-Url: http://git.meshlink.io/?a=blobdiff_plain;f=src%2Fnet.c;h=718295349738c9473616c4b0caa03ea32eb65b4f;hb=09a250a2b1d475700e1d8f18d1a835d17d0483b1;hp=2e06a39e30b11afd75e9073087da30fac980c20e;hpb=7f87c3d9134612041d56180ea7fc3e6c37991f6b;p=meshlink diff --git a/src/net.c b/src/net.c index 2e06a39e..05049cff 100644 --- a/src/net.c +++ b/src/net.c @@ -1,7 +1,6 @@ /* net.c -- most of the network code - Copyright (C) 1998,1999,2000 Ivo Timmermans , - 2000 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 @@ -13,1516 +12,722 @@ 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 1.35.4.74 2000/11/15 22:07:36 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 -#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 - -#ifdef HAVE_OPENSSL_RAND_H -# include -#else -# include -#endif - -#ifdef HAVE_OPENSSL_EVP_H -# include -#else -# include -#endif - -#ifdef HAVE_OPENSSL_ERR_H -# include -#else -# include -#endif - -#ifdef HAVE_TUNTAP -#include LINUX_IF_TUN_H -#endif - -#include -#include +#include "system.h" +#include "utils.h" #include "conf.h" -#include "connlist.h" -#include "list.h" +#include "connection.h" +#include "graph.h" +#include "logger.h" +#include "meshlink_internal.h" #include "meta.h" #include "net.h" #include "netutl.h" #include "protocol.h" -#include "subnet.h" +#include "sptps.h" +#include "xalloc.h" -#include "system.h" +#include -int tap_fd = -1; -int taptype = TAP_TYPE_ETHERTAP; -int total_tap_in = 0; -int total_tap_out = 0; -int total_socket_in = 0; -int total_socket_out = 0; +#if !defined(min) +static inline int min(int a, int b) { + return a < b ? a : b; +} +#endif -config_t *upstreamcfg; -static int seconds_till_retry; +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); -char *unknown = NULL; + c->status.active = false; -subnet_t mymac; + if(c->node && c->node->connection == c) { + c->node->connection = NULL; + } -list_t *child_pids; + if(c->edge) { + if(report) { + send_del_edge(mesh, mesh->everyone, c->edge, 0); + } -void _execute_script(const char *name) -{ - int error = 0; - char *scriptname; - char *s; - int fd; - - if(netname) - { - asprintf(&s, "NETNAME=%s", netname); - putenv(s); /* Don't free s! see man 3 putenv */ - } -#ifdef HAVE_UNSETENV - else - { - unsetenv("NETNAME"); - } -#endif + 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); + } + } + } + + outgoing_t *outgoing = c->outgoing; + connection_del(mesh, c); + + /* Check if this was our outgoing connection */ - if(chdir(confbase) < 0) - /* This cannot fail since we already read config files from this - directory. - Guus */ - /* Yes this can fail, somebody could have removed this directory - when we didn't pay attention. - Ivo */ - { - if(chdir("/") < 0) - /* Now if THIS fails, something wicked is going on. - Ivo */ - syslog(LOG_ERR, _("Couldn't chdir to `/': %m")); - - /* Continue anyway. */ - } - - asprintf(&scriptname, "%s/%s", confbase, name); - - /* Close all file descriptors */ - closelog(); - fcloseall(); - - /* Open standard input */ - if(open("/dev/null", O_RDONLY) < 0) - { - syslog(LOG_ERR, _("Opening `/dev/null' failed: %m")); - error = 1; - } - - if(!error) - { - /* Standard output directly goes to syslog */ - openlog(name, LOG_CONS | LOG_PID, LOG_DAEMON); - /* Standard error as well */ - if(dup2(1, 2) < 0) - { - syslog(LOG_ERR, _("System call `%s' failed: %m"), - "dup2"); - error = 1; + if(outgoing) { + do_outgoing_connection(mesh, outgoing); } - } - - if(error && debug_lvl > 1) - syslog(LOG_INFO, _("This means that any output the script generates will not be shown in syslog.")); - - execl(scriptname, NULL); - /* No return on success */ - - if(errno != ENOENT) /* Ignore if the file does not exist */ - syslog(LOG_WARNING, _("Error executing `%s': %m"), scriptname); - - /* No need to free things */ - exit(0); + +#ifndef HAVE_MINGW + /* Clean up dead proxy processes */ + + while(waitpid(-1, NULL, WNOHANG) > 0); + +#endif } /* - Execute the given script. - This function doesn't really belong here. + 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. */ -int execute_script(const char *name) -{ - pid_t pid; +static void timeout_handler(event_loop_t *loop, void *data) { + assert(data); + + meshlink_handle_t *mesh = loop->data; + logger(mesh, MESHLINK_DEBUG, "timeout_handler()"); + + for list_each(connection_t, c, mesh->connections) { + int pingtimeout = c->node ? mesh->dev_class_traits[c->node->devclass].pingtimeout : default_timeout; + int pinginterval = c->node ? mesh->dev_class_traits[c->node->devclass].pinginterval : default_interval; + + if(c->outgoing && c->outgoing->timeout < 5) { + pingtimeout = 1; + } + + // Also make sure that if outstanding key requests for the UDP counterpart of a connection has timed out, we restart it. + if(c->node) { + if(c->node->status.waitingforkey && c->node->last_req_key + pingtimeout <= mesh->loop.now.tv_sec) { + send_req_key(mesh, c->node); + } + } + + if(c->last_ping_time + pingtimeout <= 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); + } + } - if((pid = fork()) < 0) - { - syslog(LOG_ERR, _("System call `%s' failed: %m"), - "fork"); - return -1; - } + timeout_set(&mesh->loop, data, &(struct timespec) { + 1, prng(mesh, TIMER_FUDGE) + }); +} - if(pid) - { - list_append(child_pids, pid); - return 0; - } +// 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; - /* Child here */ + if(na->devclass < nb->devclass) { + return -1; + } - _execute_script(name); -} + if(na->devclass > nb->devclass) { + return 1; + } -int check_child(void *data) -{ - pid_t pid; - int status; - - pid = (pid_t) data; - pid = waitpid(pid, &status, WNOHANG); - if(WIFEXITED(status)) - { - if(WIFSIGNALED(status)) /* Child was killed by a signal */ - { - syslog(LOG_ERR, _("Child with PID %d was killed by signal %d (%s)"), - pid, WTERMSIG(status), strsignal(WTERMSIG(status))); - return -1; + if(na->last_successfull_connection == nb->last_successfull_connection) { + return 0; } - if(WEXITSTATUS(status) != 0) - { - syslog(LOG_INFO, _("Child with PID %d exited with code %d"), - WEXITSTATUS(status)); + + if(na->last_successfull_connection == 0 || na->last_successfull_connection > nb->last_successfull_connection) { + return -1; } - return -1; - } -} -void check_children(void) -{ - list_forall_nodes(child_pids, check_child); -} + if(nb->last_successfull_connection == 0 || na->last_successfull_connection < nb->last_successfull_connection) { + return 1; + } -int xsend(conn_list_t *cl, vpn_packet_t *inpkt) -{ - vpn_packet_t outpkt; - int outlen, outpad; - EVP_CIPHER_CTX ctx; -cp - outpkt.len = inpkt->len; - - /* Encrypt the packet */ - - EVP_EncryptInit(&ctx, cl->cipher_pkttype, cl->cipher_pktkey, cl->cipher_pktkey + cl->cipher_pkttype->key_len); - EVP_EncryptUpdate(&ctx, outpkt.data, &outlen, inpkt->data, inpkt->len); - EVP_EncryptFinal(&ctx, outpkt.data + outlen, &outpad); - outlen += outpad + 2; - -/* Bypass - outlen = outpkt.len + 2; - memcpy(&outpkt, inpkt, outlen); -*/ - - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_ERR, _("Sending packet of %d bytes to %s (%s)"), - outlen, cl->name, cl->hostname); - - total_socket_out += outlen; - - if((send(cl->socket, (char *) &(outpkt.len), outlen, 0)) < 0) - { - syslog(LOG_ERR, _("Error sending packet to %s (%s): %m"), - cl->name, cl->hostname); - return -1; - } -cp - return 0; -} + if(na < nb) { + return -1; + } -int xrecv(conn_list_t *cl, vpn_packet_t *inpkt) -{ - vpn_packet_t outpkt; - int outlen, outpad; - EVP_CIPHER_CTX ctx; -cp - outpkt.len = inpkt->len; - - /* Decrypt the packet */ - - EVP_DecryptInit(&ctx, myself->cipher_pkttype, myself->cipher_pktkey, myself->cipher_pktkey + myself->cipher_pkttype->key_len); - EVP_DecryptUpdate(&ctx, outpkt.data, &outlen, inpkt->data, inpkt->len + 8); - EVP_DecryptFinal(&ctx, outpkt.data + outlen, &outpad); - outlen += outpad; - -/* Bypass - outlen = outpkt.len+2; - memcpy(&outpkt, inpkt, outlen); -*/ - - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_ERR, _("Writing packet of %d bytes to tap device"), - outpkt.len, outlen); - - /* Fix mac address */ - - memcpy(outpkt.data, mymac.net.mac.address.x, 6); - - if(taptype == TAP_TYPE_TUNTAP) - { - if(write(tap_fd, outpkt.data, outpkt.len) < 0) - syslog(LOG_ERR, _("Can't write to tun/tap device: %m")); - else - total_tap_out += outpkt.len; - } - else /* ethertap */ - { - if(write(tap_fd, outpkt.data - 2, outpkt.len + 2) < 0) - syslog(LOG_ERR, _("Can't write to ethertap device: %m")); - else - total_tap_out += outpkt.len + 2; - } -cp - return 0; -} + if(na > nb) { + return 1; + } -/* - add the given packet of size s to the - queue q, be it the send or receive queue -*/ -void add_queue(packet_queue_t **q, void *packet, size_t s) -{ - queue_element_t *e; -cp - e = xmalloc(sizeof(*e)); - e->packet = xmalloc(s); - memcpy(e->packet, packet, s); - - if(!*q) - { - *q = xmalloc(sizeof(**q)); - (*q)->head = (*q)->tail = NULL; - } - - e->next = NULL; /* We insert at the tail */ - - if((*q)->tail) /* Do we have a tail? */ - { - (*q)->tail->next = e; - e->prev = (*q)->tail; - } - else /* No tail -> no head too */ - { - (*q)->head = e; - e->prev = NULL; - } - - (*q)->tail = e; -cp + return 0; } -/* Remove a queue element */ -void del_queue(packet_queue_t **q, queue_element_t *e) -{ -cp - free(e->packet); - - if(e->next) /* There is a successor, so we are not tail */ - { - if(e->prev) /* There is a predecessor, so we are not head */ - { - e->next->prev = e->prev; - e->prev->next = e->next; - } - else /* We are head */ - { - e->next->prev = NULL; - (*q)->head = e->next; - } - } - else /* We are tail (or all alone!) */ - { - if(e->prev) /* We are not alone :) */ - { - e->prev->next = NULL; - (*q)->tail = e->prev; - } - else /* Adieu */ - { - free(*q); - *q = NULL; - } - } - - free(e); -cp -} +// last_successfull_connection desc +static int node_compare_lsc_desc(const void *a, const void *b) { + const node_t *na = a, *nb = b; -/* - flush a queue by calling function for - each packet, and removing it when that - returned a zero exit code -*/ -void flush_queue(conn_list_t *cl, packet_queue_t **pq, - int (*function)(conn_list_t*,vpn_packet_t*)) -{ - queue_element_t *p, *next = NULL; -cp - for(p = (*pq)->head; p != NULL; ) - { - next = p->next; - - if(!function(cl, p->packet)) - del_queue(pq, p); - - p = next; - } - - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_DEBUG, _("Queue flushed")); -cp -} + if(na->last_successfull_connection == nb->last_successfull_connection) { + return 0; + } -/* - flush the send&recv queues - void because nothing goes wrong here, packets - remain in the queue if something goes wrong -*/ -void flush_queues(conn_list_t *cl) -{ -cp - if(cl->sq) - { - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_DEBUG, _("Flushing send queue for %s (%s)"), - cl->name, cl->hostname); - flush_queue(cl, &(cl->sq), xsend); - } - - if(cl->rq) - { - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_DEBUG, _("Flushing receive queue for %s (%s)"), - cl->name, cl->hostname); - flush_queue(cl, &(cl->rq), xrecv); - } -cp -} + if(na->last_successfull_connection == 0 || na->last_successfull_connection > nb->last_successfull_connection) { + return -1; + } -/* - send a packet to the given vpn ip. -*/ -int send_packet(ip_t to, vpn_packet_t *packet) -{ - conn_list_t *cl; - subnet_t *subnet; -cp - if((subnet = lookup_subnet_ipv4(to)) == NULL) - { - if(debug_lvl >= DEBUG_TRAFFIC) - { - syslog(LOG_NOTICE, _("Trying to look up %d.%d.%d.%d in connection list failed!"), - IP_ADDR_V(to)); - } - - return -1; - } - - cl = subnet->owner; - - if(cl == myself) - { - if(debug_lvl >= DEBUG_TRAFFIC) - { - syslog(LOG_NOTICE, _("Packet with destination %d.%d.%d.%d is looping back to us!"), - IP_ADDR_V(to)); - } - - return -1; - } - - /* If we ourselves have indirectdata flag set, we should send only to our uplink! */ - - /* FIXME - check for indirection and reprogram it The Right Way(tm) this time. */ - - /* Connections are now opened beforehand... - - if(!cl->status.dataopen) - if(setup_vpn_connection(cl) < 0) - { - syslog(LOG_ERR, _("Could not open UDP connection to %s (%s)"), - cl->name, cl->hostname); - return -1; - } - */ - - if(!cl->status.validkey) - { -/* FIXME: Don't queue until everything else is fixed. - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_INFO, _("No valid key known yet for %s (%s), queueing packet"), - cl->name, cl->hostname); - add_queue(&(cl->sq), packet, packet->len + 2); -*/ - if(!cl->status.waitingforkey) - send_req_key(myself, cl); /* Keys should be sent to the host running the tincd */ - return 0; - } - - if(!cl->status.active) - { -/* FIXME: Don't queue until everything else is fixed. - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_INFO, _("%s (%s) is not ready, queueing packet"), - cl->name, cl->hostname); - add_queue(&(cl->sq), packet, packet->len + 2); -*/ - return 0; /* We don't want to mess up, do we? */ - } + if(nb->last_successfull_connection == 0 || na->last_successfull_connection < nb->last_successfull_connection) { + return 1; + } - /* can we send it? can we? can we? huh? */ -cp - return xsend(cl, packet); -} + if(na < nb) { + return -1; + } -/* - open the local ethertap device -*/ -int setup_tap_fd(void) -{ - int nfd; - const char *tapfname; - config_t const *cfg; - struct ifreq ifr; - -cp - if((cfg = get_config_val(config, config_tapdevice))) - tapfname = cfg->data.ptr; - else -#ifdef HAVE_TUNTAP - tapfname = "/dev/misc/net/tun"; -#else - tapfname = "/dev/tap0"; -#endif -cp - if((nfd = open(tapfname, O_RDWR | O_NONBLOCK)) < 0) - { - syslog(LOG_ERR, _("Could not open %s: %m"), tapfname); - return -1; - } -cp - tap_fd = nfd; - - /* Set default MAC address for ethertap devices */ - - taptype = TAP_TYPE_ETHERTAP; - mymac.type = SUBNET_MAC; - mymac.net.mac.address.x[0] = 0xfe; - mymac.net.mac.address.x[1] = 0xfd; - mymac.net.mac.address.x[2] = 0x00; - mymac.net.mac.address.x[3] = 0x00; - mymac.net.mac.address.x[4] = 0x00; - mymac.net.mac.address.x[5] = 0x00; - -#ifdef HAVE_TUNTAP - /* Ok now check if this is an old ethertap or a new tun/tap thingie */ - memset(&ifr, 0, sizeof(ifr)); -cp - ifr.ifr_flags = IFF_TAP | IFF_NO_PI; - if (netname) - strncpy(ifr.ifr_name, netname, IFNAMSIZ); -cp - if (!ioctl(tap_fd, TUNSETIFF, (void *) &ifr)) - { - syslog(LOG_INFO, _("%s is a new style tun/tap device"), tapfname); - taptype = TAP_TYPE_TUNTAP; - } -#endif -cp - return 0; -} + if(na > nb) { + return 1; + } -/* - set up the socket that we listen on for incoming - (tcp) connections -*/ -int setup_listen_meta_socket(int port) -{ - int nfd, flags; - struct sockaddr_in a; - const int one = 1; - config_t const *cfg; -cp - if((nfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) - { - syslog(LOG_ERR, _("Creating metasocket failed: %m")); - return -1; - } - - if(setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one))) - { - close(nfd); - syslog(LOG_ERR, _("System call `%s' failed: %m"), - "setsockopt"); - return -1; - } - - if(setsockopt(nfd, SOL_SOCKET, SO_KEEPALIVE, &one, sizeof(one))) - { - close(nfd); - syslog(LOG_ERR, _("System call `%s' failed: %m"), - "setsockopt"); - 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"); - return -1; - } - - if((cfg = get_config_val(config, config_interface))) - { - if(setsockopt(nfd, SOL_SOCKET, SO_KEEPALIVE, cfg->data.ptr, strlen(cfg->data.ptr))) - { - close(nfd); - syslog(LOG_ERR, _("Unable to bind listen socket to interface %s: %m"), cfg->data.ptr); - return -1; - } - } - - memset(&a, 0, sizeof(a)); - a.sin_family = AF_INET; - a.sin_port = htons(port); - - if((cfg = get_config_val(config, config_interfaceip))) - a.sin_addr.s_addr = htonl(cfg->data.ip->address); - else - a.sin_addr.s_addr = htonl(INADDR_ANY); - - if(bind(nfd, (struct sockaddr *)&a, sizeof(struct sockaddr))) - { - close(nfd); - syslog(LOG_ERR, _("Can't bind to port %hd/tcp: %m"), port); - return -1; - } - - if(listen(nfd, 3)) - { - close(nfd); - syslog(LOG_ERR, _("System call `%s' failed: %m"), - "listen"); - return -1; - } -cp - return nfd; + return 0; } -/* - setup the socket for incoming encrypted - data (the udp part) -*/ -int setup_vpn_in_socket(int port) -{ - int nfd, flags; - struct sockaddr_in a; - const int one = 1; -cp - if((nfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) - { - close(nfd); - syslog(LOG_ERR, _("Creating socket failed: %m")); - return -1; - } - - if(setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one))) - { - close(nfd); - syslog(LOG_ERR, _("System call `%s' failed: %m"), - "setsockopt"); - 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"); - return -1; - } - - memset(&a, 0, sizeof(a)); - a.sin_family = AF_INET; - a.sin_port = htons(port); - a.sin_addr.s_addr = htonl(INADDR_ANY); - - if(bind(nfd, (struct sockaddr *)&a, sizeof(struct sockaddr))) - { - close(nfd); - syslog(LOG_ERR, _("Can't bind to port %hd/udp: %m"), port); - return -1; - } -cp - return nfd; -} +// devclass desc +static int node_compare_devclass_desc(const void *a, const void *b) { + const node_t *na = a, *nb = b; -/* - setup an outgoing meta (tcp) socket -*/ -int setup_outgoing_meta_socket(conn_list_t *cl) -{ - int flags; - struct sockaddr_in a; - config_t const *cfg; -cp - if(debug_lvl >= DEBUG_CONNECTIONS) - syslog(LOG_INFO, _("Trying to connect to %s"), cl->hostname); - - if((cfg = get_config_val(cl->config, config_port)) == NULL) - cl->port = 655; - else - cl->port = cfg->data.val; - - cl->meta_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); - if(cl->meta_socket == -1) - { - syslog(LOG_ERR, _("Creating socket for %s port %d failed: %m"), - cl->hostname, cl->port); - return -1; - } - - a.sin_family = AF_INET; - a.sin_port = htons(cl->port); - a.sin_addr.s_addr = htonl(cl->address); - - if(connect(cl->meta_socket, (struct sockaddr *)&a, sizeof(a)) == -1) - { - close(cl->meta_socket); - syslog(LOG_ERR, _("%s port %hd: %m"), cl->hostname, cl->port); - return -1; - } - - flags = fcntl(cl->meta_socket, F_GETFL); - if(fcntl(cl->meta_socket, F_SETFL, flags | O_NONBLOCK) < 0) - { - close(cl->meta_socket); - syslog(LOG_ERR, _("fcntl for %s port %d: %m"), - cl->hostname, cl->port); - return -1; - } - - if(debug_lvl >= DEBUG_CONNECTIONS) - syslog(LOG_INFO, _("Connected to %s port %hd"), - cl->hostname, cl->port); - - cl->status.meta = 1; -cp - return 0; -} + if(na->devclass < nb->devclass) { + return -1; + } -/* - setup an outgoing connection. It's not - necessary to also open an udp socket as - well, because the other host will initiate - an authentication sequence during which - we will do just that. -*/ -int setup_outgoing_connection(char *name) -{ - conn_list_t *ncn; - struct hostent *h; - config_t const *cfg; -cp - if(check_id(name)) - { - syslog(LOG_ERR, _("Invalid name for outgoing connection")); - return -1; - } - - ncn = new_conn_list(); - asprintf(&ncn->name, "%s", name); - - if(read_host_config(ncn)) - { - syslog(LOG_ERR, _("Error reading host configuration file for %s")); - free_conn_list(ncn); - return -1; - } - - if(!(cfg = get_config_val(ncn->config, config_address))) - { - syslog(LOG_ERR, _("No address specified for %s")); - free_conn_list(ncn); - return -1; - } - - if(!(h = gethostbyname(cfg->data.ptr))) - { - syslog(LOG_ERR, _("Error looking up `%s': %m"), cfg->data.ptr); - free_conn_list(ncn); - return -1; - } - - ncn->address = ntohl(*((ip_t*)(h->h_addr_list[0]))); - ncn->hostname = hostlookup(htonl(ncn->address)); - - if(setup_outgoing_meta_socket(ncn) < 0) - { - syslog(LOG_ERR, _("Could not set up a meta connection to %s"), - ncn->hostname); - free_conn_list(ncn); - return -1; - } - - ncn->status.outgoing = 1; - ncn->buffer = xmalloc(MAXBUFSIZE); - ncn->buflen = 0; - ncn->last_ping_time = time(NULL); - - conn_list_add(ncn); - - send_id(ncn); -cp - return 0; -} + if(na->devclass > nb->devclass) { + return 1; + } -/* - Configure conn_list_t myself and set up the local sockets (listen only) -*/ -int setup_myself(void) -{ - config_t const *cfg; - config_t *next; - subnet_t *net; -cp - myself = new_conn_list(); - - asprintf(&myself->hostname, "MYSELF"); /* FIXME? Do hostlookup on ourselves? */ - myself->flags = 0; - myself->protocol_version = PROT_CURRENT; - - if(!(cfg = get_config_val(config, config_name))) /* Not acceptable */ - { - syslog(LOG_ERR, _("Name for tinc daemon required!")); - return -1; - } - else - asprintf(&myself->name, "%s", (char*)cfg->data.val); - - if(check_id(myself->name)) - { - syslog(LOG_ERR, _("Invalid name for myself!")); - return -1; - } -cp - if(!(cfg = get_config_val(config, config_privatekey))) - { - syslog(LOG_ERR, _("Private key for tinc daemon required!")); - return -1; - } - else - { - myself->rsa_key = RSA_new(); - BN_hex2bn(&myself->rsa_key->d, cfg->data.ptr); - BN_hex2bn(&myself->rsa_key->e, "FFFF"); - } - - if(read_host_config(myself)) - { - syslog(LOG_ERR, _("Cannot open host configuration file for myself!")); - return -1; - } -cp - if(!(cfg = get_config_val(myself->config, config_publickey))) - { - syslog(LOG_ERR, _("Public key for tinc daemon required!")); - return -1; - } - else - { - BN_hex2bn(&myself->rsa_key->n, cfg->data.ptr); - } -/* - if(RSA_check_key(myself->rsa_key) != 1) - { - syslog(LOG_ERR, _("Invalid public/private keypair!")); - return -1; - } -*/ - if(!(cfg = get_config_val(myself->config, config_port))) - myself->port = 655; - else - myself->port = cfg->data.val; - - if((cfg = get_config_val(myself->config, config_indirectdata))) - if(cfg->data.val == stupid_true) - myself->flags |= EXPORTINDIRECTDATA; - - if((cfg = get_config_val(myself->config, config_tcponly))) - if(cfg->data.val == stupid_true) - myself->flags |= TCPONLY; - -/* Read in all the subnets specified in the host configuration file */ - - for(next = myself->config; (cfg = get_config_val(next, config_subnet)); next = cfg->next) - { - net = new_subnet(); - net->type = SUBNET_IPV4; - net->net.ipv4.address = cfg->data.ip->address; - net->net.ipv4.mask = cfg->data.ip->mask; - - /* Teach newbies what subnets are... */ - - if((net->net.ipv4.address & net->net.ipv4.mask) != net->net.ipv4.address) - { - syslog(LOG_ERR, _("Network address and subnet mask do not match!")); - return -1; - } - - subnet_add(myself, net); - } - - if((myself->meta_socket = setup_listen_meta_socket(myself->port)) < 0) - { - syslog(LOG_ERR, _("Unable to set up a listening socket!")); - return -1; - } - - /* Generate packet encryption key */ - - myself->cipher_pkttype = EVP_bf_cfb(); - - myself->cipher_pktkeylength = myself->cipher_pkttype->key_len + myself->cipher_pkttype->iv_len; - - myself->cipher_pktkey = (char *)xmalloc(myself->cipher_pktkeylength); - RAND_bytes(myself->cipher_pktkey, myself->cipher_pktkeylength); - - if(!(cfg = get_config_val(config, config_keyexpire))) - keylifetime = 3600; - else - keylifetime = cfg->data.val; - - keyexpires = time(NULL) + keylifetime; - - /* Activate ourselves */ - - myself->status.active = 1; - - syslog(LOG_NOTICE, _("Ready: listening on port %hd"), myself->port); - - child_pids = list_new(); -cp - return 0; -} + if(na < nb) { + return -1; + } -RETSIGTYPE -sigalrm_handler(int a) -{ - config_t const *cfg; -cp - cfg = get_config_val(upstreamcfg, config_connectto); - - if(!cfg && upstreamcfg == config) - /* No upstream IP given, we're listen only. */ - return; - - while(cfg) - { - upstreamcfg = cfg->next; - if(!setup_outgoing_connection(cfg->data.ptr)) /* function returns 0 when there are no problems */ - { - signal(SIGALRM, SIG_IGN); - return; - } - cfg = get_config_val(upstreamcfg, config_connectto); /* Or else we try the next ConnectTo line */ - } - - signal(SIGALRM, sigalrm_handler); - upstreamcfg = config; - seconds_till_retry += 5; - if(seconds_till_retry > MAXTIMEOUT) /* Don't wait more than MAXTIMEOUT seconds. */ - seconds_till_retry = MAXTIMEOUT; - syslog(LOG_ERR, _("Still failed to connect to other, will retry in %d seconds"), - seconds_till_retry); - alarm(seconds_till_retry); -cp -} + if(na > nb) { + return 1; + } -/* - setup all initial network connections -*/ -int setup_network_connections(void) -{ - config_t const *cfg; -cp - if((cfg = get_config_val(config, config_pingtimeout)) == NULL) - timeout = 60; - else - { - timeout = cfg->data.val; - if(timeout < 1) - { - timeout = 86400; - } - } - - if(setup_tap_fd() < 0) - return -1; - - if(setup_myself() < 0) - return -1; - - /* Run tinc-up script to further initialize the tap interface */ - execute_script("tinc-up"); - - if(!(cfg = get_config_val(config, config_connectto))) - /* No upstream IP given, we're listen only. */ - return 0; - - while(cfg) - { - upstreamcfg = cfg->next; - if(!setup_outgoing_connection(cfg->data.ptr)) /* function returns 0 when there are no problems */ - return 0; - cfg = get_config_val(upstreamcfg, config_connectto); /* Or else we try the next ConnectTo line */ - } - - signal(SIGALRM, sigalrm_handler); - upstreamcfg = config; - seconds_till_retry = MAXTIMEOUT; - syslog(LOG_NOTICE, _("Trying to re-establish outgoing connection in %d seconds"), seconds_till_retry); - alarm(seconds_till_retry); -cp - return 0; + return 0; } -/* - close all open network connections -*/ -void close_network_connections(void) -{ - conn_list_t *p; -cp - for(p = conn_list; p != NULL; p = p->next) - { - p->status.active = 0; - terminate_connection(p); - } - - if(myself) - if(myself->status.active) - { - close(myself->meta_socket); - free_conn_list(myself); - myself = NULL; - } - - close(tap_fd); - - /* Execute tinc-down script right after shutting down the interface */ - execute_script("tinc-down"); - - destroy_conn_list(); - - syslog(LOG_NOTICE, _("Terminating")); -cp - return; -} /* - create a data (udp) socket -*/ -int setup_vpn_connection(conn_list_t *cl) -{ - int nfd, flags; - struct sockaddr_in a; - const int one = 1; -cp - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_DEBUG, _("Opening UDP socket to %s"), cl->hostname); - - nfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); - if(nfd == -1) - { - syslog(LOG_ERR, _("Creating UDP socket failed: %m")); - return -1; - } - - if(setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one))) - { - close(nfd); - syslog(LOG_ERR, _("System call `%s' failed: %m"), - "setsockopt"); - 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"); - return -1; - } - - memset(&a, 0, sizeof(a)); - a.sin_family = AF_INET; - a.sin_port = htons(myself->port); - a.sin_addr.s_addr = htonl(INADDR_ANY); - - if(bind(nfd, (struct sockaddr *)&a, sizeof(struct sockaddr))) - { - close(nfd); - syslog(LOG_ERR, _("Can't bind to port %hd/udp: %m"), myself->port); - return -1; - } - - a.sin_family = AF_INET; - a.sin_port = htons(cl->port); - a.sin_addr.s_addr = htonl(cl->address); - - if(connect(nfd, (struct sockaddr *)&a, sizeof(a)) == -1) - { - close(nfd); - syslog(LOG_ERR, _("Connecting to %s port %d failed: %m"), - cl->hostname, cl->port); - return -1; - } - - flags = fcntl(nfd, F_GETFL); - if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) - { - close(nfd); - syslog(LOG_ERR, _("This is a bug: %s:%d: %d:%m %s (%s)"), __FILE__, __LINE__, nfd, - cl->name, cl->hostname); - return -1; - } - - cl->socket = nfd; - cl->status.dataopen = 1; -cp - return 0; -} -/* - handle an incoming tcp connect call and open - a connection to it. -*/ -conn_list_t *create_new_connection(int sfd) +autoconnect() { - conn_list_t *p; - struct sockaddr_in ci; - int len = sizeof(ci); -cp - p = new_conn_list(); - - if(getpeername(sfd, (struct sockaddr *) &ci, (socklen_t *) &len) < 0) - { - syslog(LOG_ERR, _("System call `%s' failed: %m"), - "getpeername"); - return NULL; - } - - p->name = unknown; - p->address = ntohl(ci.sin_addr.s_addr); - p->hostname = hostlookup(ci.sin_addr.s_addr); - p->meta_socket = sfd; - p->status.meta = 1; - p->buffer = xmalloc(MAXBUFSIZE); - p->buflen = 0; - p->last_ping_time = time(NULL); - - if(debug_lvl >= DEBUG_CONNECTIONS) - syslog(LOG_NOTICE, _("Connection from %s port %d"), - p->hostname, htons(ci.sin_port)); - - p->allow_request = ID; -cp - return p; -} + timeout = 5 -/* - put all file descriptors in an fd_set array -*/ -void build_fdset(fd_set *fs) -{ - conn_list_t *p; -cp - FD_ZERO(fs); - - for(p = conn_list; p != NULL; p = p->next) - { - if(p->status.meta) - FD_SET(p->meta_socket, fs); - if(p->status.dataopen) - FD_SET(p->socket, fs); - } - - FD_SET(myself->meta_socket, fs); - FD_SET(tap_fd, fs); -cp -} + // find the best one for initial connect -/* - receive incoming data from the listening - udp socket and write it to the ethertap - device after being decrypted -*/ -int handle_incoming_vpn_data(conn_list_t *cl) -{ - vpn_packet_t pkt; - int x, l = sizeof(x); - int lenin; -cp - if(getsockopt(cl->socket, SOL_SOCKET, SO_ERROR, &x, &l) < 0) - { - syslog(LOG_ERR, _("This is a bug: %s:%d: %d:%m"), - __FILE__, __LINE__, cl->socket); - return -1; - } - if(x) - { - syslog(LOG_ERR, _("Incoming data socket error: %s"), strerror(x)); - return -1; - } - - if((lenin = recv(cl->socket, (char *) &(pkt.len), MTU, 0)) <= 0) - { - syslog(LOG_ERR, _("Receiving packet failed: %m")); - return -1; - } - - if(debug_lvl >= DEBUG_TRAFFIC) - { - syslog(LOG_DEBUG, _("Received packet of %d bytes from %s (%s)"), lenin, - cl->name, cl->hostname); - } - -cp - return xrecv(cl, &pkt); -} + 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) -/* - terminate a connection and notify the other - end before closing the sockets -*/ -void terminate_connection(conn_list_t *cl) -{ - conn_list_t *p; - subnet_t *s; -cp - if(cl->status.remove) - return; - - cl->status.remove = 1; - - if(debug_lvl >= DEBUG_CONNECTIONS) - syslog(LOG_NOTICE, _("Closing connection with %s (%s)"), - cl->name, cl->hostname); - - if(cl->socket) - close(cl->socket); - if(cl->status.meta) - close(cl->meta_socket); - -cp - /* Find all connections that were lost because they were behind cl - (the connection that was dropped). */ - - if(cl->status.meta) - for(p = conn_list; p != NULL; p = p->next) - if((p->nexthop == cl) && (p != cl)) - terminate_connection(p); /* Sounds like recursion, but p does not have a meta connection :) */ - - /* Inform others of termination if it was still active */ - - if(cl->status.active) - for(p = conn_list; p != NULL; p = p->next) - if(p->status.meta && p->status.active && p!=cl) - send_del_host(p, cl); - - /* Remove the associated subnets */ - - for(s = cl->subnets; s; s = s->next) - subnet_del(s); - - /* Check if this was our outgoing connection */ - - if(cl->status.outgoing && cl->status.active) - { - signal(SIGALRM, sigalrm_handler); - seconds_till_retry = 5; - alarm(seconds_till_retry); - syslog(LOG_NOTICE, _("Trying to re-establish outgoing connection in 5 seconds")); - } - - /* Inactivate */ - - cl->status.active = 0; -cp } -/* - 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. */ -int check_dead_connections(void) -{ - conn_list_t *p; - time_t now; -cp - now = time(NULL); - for(p = conn_list; p != NULL; p = p->next) - { - if(p->status.active && p->status.meta) - { - if(p->last_ping_time + timeout < now) - { - if(p->status.pinged) - { - if(debug_lvl >= DEBUG_PROTOCOL) - syslog(LOG_INFO, _("%s (%s) didn't respond to PING"), - p->name, p->hostname); - p->status.timeout = 1; - terminate_connection(p); - } - else - { - send_ping(p); - } - } + + +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); + struct timespec ts = {mesh->sleeptime, 0}; + clock_nanosleep(CLOCK_MONOTONIC, 0, &ts, NULL); + mesh->sleeptime *= 2; + + if(mesh->sleeptime < 0) { + mesh->sleeptime = 3600; + } + } else { + mesh->sleeptime /= 2; + + if(mesh->sleeptime < 10) { + mesh->sleeptime = 10; + } } - } -cp - return 0; -} -/* - accept a new tcp connect and create a - new connection -*/ -int handle_new_meta_connection() -{ - conn_list_t *ncn; - struct sockaddr client; - int nfd, len = sizeof(client); -cp - if((nfd = accept(myself->meta_socket, &client, &len)) < 0) - { - syslog(LOG_ERR, _("Accepting a new connection failed: %m")); - return -1; - } - - if(!(ncn = create_new_connection(nfd))) - { - shutdown(nfd, 2); - close(nfd); - syslog(LOG_NOTICE, _("Closed attempted connection")); - return 0; - } - - conn_list_add(ncn); -cp - return 0; + mesh->contradicting_add_edge = 0; + mesh->contradicting_del_edge = 0; + + int timeout = default_timeout; + + /* Check if we need to make or break connections. */ + + if(mesh->nodes->count > 1) { + + 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) { + if(!node_write_config(mesh, n)) { + logger(mesh, MESHLINK_DEBUG, "Could not update %s", n->name); + } + + n->status.dirty = false; + } + + if(n->status.validkey && n->last_req_key + 3600 < mesh->loop.now.tv_sec) { + logger(mesh, MESHLINK_DEBUG, "SPTPS key renewal for node %s", n->name); + + if(!sptps_force_kex(&n->sptps)) { + logger(mesh, MESHLINK_ERROR, "SPTPS key renewal for node %s failed", n->name); + n->status.validkey = false; + sptps_stop(&n->sptps); + n->status.waitingforkey = false; + n->last_req_key = 0; + } else { + n->last_req_key = mesh->loop.now.tv_sec; + } + } + } + + timeout_set(&mesh->loop, data, &(struct timespec) { + timeout, prng(mesh, TIMER_FUDGE) + }); } -/* - check all connections to see if anything - happened on their sockets -*/ -void check_network_activity(fd_set *f) -{ - conn_list_t *p; -cp - for(p = conn_list; p != NULL; p = p->next) - { - if(p->status.remove) - continue; - - if(p->status.dataopen) - if(FD_ISSET(p->socket, f)) - { - handle_incoming_vpn_data(p); - - /* Old error stuff (FIXME: copy this to handle_incoming_vpn_data() - - getsockopt(p->socket, SOL_SOCKET, SO_ERROR, &x, &l); - syslog(LOG_ERR, _("Outgoing data socket error for %s (%s): %s"), - p->name, p->hostname, strerror(x)); - terminate_connection(p); - */ - return; - } - - if(p->status.meta) - if(FD_ISSET(p->meta_socket, f)) - if(receive_meta(p) < 0) - { - terminate_connection(p); - return; - } - } - - if(FD_ISSET(myself->meta_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; + } } -/* - read, encrypt and send data that is - available through the ethertap device -*/ -void handle_tap_input(void) -{ - vpn_packet_t vp; - int lenin; -cp - if(taptype == TAP_TYPE_TUNTAP) - { - if((lenin = read(tap_fd, vp.data, MTU)) <= 0) - { - syslog(LOG_ERR, _("Error while reading from tun/tap device: %m")); - return; - } - vp.len = lenin; - } - else /* ethertap */ - { - if((lenin = read(tap_fd, vp.data - 2, MTU)) <= 0) - { - syslog(LOG_ERR, _("Error while reading from ethertap device: %m")); - return; - } - vp.len = lenin - 2; - } - - total_tap_in += lenin; - - if(lenin < 32) - { - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_WARNING, _("Received short packet from tap device")); - return; - } - - if(debug_lvl >= DEBUG_TRAFFIC) - { - syslog(LOG_DEBUG, _("Read packet of length %d from tap device"), vp.len); - } - - send_packet(ntohl(*((unsigned long*)(&vp.data[30]))), &vp); -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 timespec) { + 0, 0 + }); + } + } + + /* For active connections, check if their addresses are still valid. + * If yes, reset their ping timers, otherwise terminate them. */ + for list_each(connection_t, c, mesh->connections) { + if(!c->status.active) { + continue; + } + + if(!c->status.pinged) { + c->last_ping_time = 0; + } + + sockaddr_t sa; + socklen_t salen = sizeof(sa); + + if(getsockname(c->socket, &sa.sa, &salen)) { + continue; + } + + switch(sa.sa.sa_family) { + case AF_INET: + sa.in.sin_port = 0; + break; + + case AF_INET6: + sa.in6.sin6_port = 0; + break; + + default: + continue; + } + + int sock = socket(sa.sa.sa_family, SOCK_STREAM, IPPROTO_TCP); + + if(sock != -1) { + continue; + } + + if(bind(sock, &sa.sa, salen) && errno == EADDRNOTAVAIL) { + logger(mesh, MESHLINK_DEBUG, "Local address for connection to %s no longer valid, terminating", c->name); + terminate_connection(mesh, c, c->status.active); + } + + closesocket(sock); + } + + /* Kick the ping timeout handler */ + timeout_set(&mesh->loop, &mesh->pingtimer, &(struct timespec) { + 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; -cp - last_ping_check = time(NULL); - - for(;;) - { - tv.tv_sec = timeout; - tv.tv_usec = 0; - - prune_conn_list(); - 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(); - clear_config(&config); - - if(read_server_config()) - { - syslog(LOG_ERR, _("Unable to reread configuration file, exiting")); - exit(0); - } - - 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_bytes(myself->cipher_pktkey, myself->cipher_pktkeylength); - send_key_changed(myself, NULL); - keyexpires = time(NULL) + keylifetime; - } +void main_loop(meshlink_handle_t *mesh) { + timeout_add(&mesh->loop, &mesh->pingtimer, timeout_handler, &mesh->pingtimer, &(struct timespec) { + 1, prng(mesh, TIMER_FUDGE) + }); + timeout_add(&mesh->loop, &mesh->periodictimer, periodic_handler, &mesh->periodictimer, &(struct timespec) { + 0, 0 + }); + + //Add signal handler + mesh->datafromapp.signum = 0; + signal_add(&mesh->loop, &mesh->datafromapp, meshlink_send_from_queue, mesh, mesh->datafromapp.signum); + + if(!event_loop_run(&mesh->loop, &mesh->mutex)) { + logger(mesh, MESHLINK_ERROR, "Error while waiting for input: %s", strerror(errno)); + call_error_cb(mesh, MESHLINK_ENETWORK); } - if(r > 0) - { - check_network_activity(&fset); - - /* local tap data */ - if(FD_ISSET(tap_fd, &fset)) - handle_tap_input(); - } - - check_children(); - } -cp + signal_del(&mesh->loop, &mesh->datafromapp); + timeout_del(&mesh->loop, &mesh->periodictimer); + timeout_del(&mesh->loop, &mesh->pingtimer); }