/*
net.c -- most of the network code
- Copyright (C) 1998,99 Ivo Timmermans <zarq@iname.com>
+ Copyright (C) 2014-2017 Guus Sliepen <guus@meshlink.io>
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
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.
+ 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 <arpa/inet.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <netdb.h>
-#include <netinet/in.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/signal.h>
-#include <sys/socket.h>
-#include <sys/time.h>
-#include <sys/types.h>
-#include <syslog.h>
-#include <unistd.h>
-
-#include <cipher.h>
-#include <utils.h>
-#include <xalloc.h>
+#include "system.h"
+#include "utils.h"
#include "conf.h"
-#include "encr.h"
+#include "connection.h"
+#include "devtools.h"
+#include "graph.h"
+#include "logger.h"
+#include "meshlink_internal.h"
+#include "meta.h"
#include "net.h"
#include "netutl.h"
#include "protocol.h"
+#include "sptps.h"
+#include "xalloc.h"
-int tap_fd = -1;
+#include <assert.h>
-int total_tap_in = 0;
-int total_tap_out = 0;
-int total_socket_in = 0;
-int total_socket_out = 0;
-
-time_t last_ping_time = 0;
+#if !defined(min)
+static inline int min(int a, int b) {
+ return a < b ? a : b;
+}
+#endif
-/* The global list of existing connections */
-conn_list_t *conn_list = NULL;
-conn_list_t *myself = NULL;
+static const int default_timeout = 5;
+static const int default_interval = 60;
/*
- strip off the MAC adresses of an ethernet frame
+ 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 strip_mac_addresses(vpn_packet_t *p)
-{
- unsigned char tmp[MAXSIZE];
-cp
- memcpy(tmp, p->data, p->len);
- p->len -= 12;
- memcpy(p->data, &tmp[12], p->len);
-cp
-}
+void terminate_connection(meshlink_handle_t *mesh, connection_t *c, bool report) {
+ logger(mesh, MESHLINK_INFO, "Closing connection with %s", c->name);
-/*
- reassemble MAC addresses
-*/
-void add_mac_addresses(vpn_packet_t *p)
-{
- unsigned char tmp[MAXSIZE];
-cp
- memcpy(&tmp[12], p->data, p->len);
- p->len += 12;
- tmp[0] = tmp[6] = 0xfe;
- tmp[1] = tmp[7] = 0xfd;
- *((ip_t*)(&tmp[2])) = (ip_t)(htonl(myself->vpn_ip));
- *((ip_t*)(&tmp[8])) = *((ip_t*)(&tmp[26]));
- memcpy(p->data, &tmp[0], p->len);
-cp
-}
+ c->status.active = false;
-int xsend(conn_list_t *cl, void *packet)
-{
- int r;
- real_packet_t rp;
-cp
- do_encrypt((vpn_packet_t*)packet, &rp, cl->key);
- rp.from = htonl(myself->vpn_ip);
- rp.data.len = htons(rp.data.len);
- rp.len = htons(rp.len);
-
- if(debug_lvl > 3)
- syslog(LOG_ERR, "Sent %d bytes to %lx", ntohs(rp.len), cl->vpn_ip);
-
- if((r = send(cl->socket, (char*)&rp, ntohs(rp.len), 0)) < 0)
- {
- syslog(LOG_ERR, "Error sending data: %m");
- return -1;
- }
-
- total_socket_out += r;
-cp
- return 0;
-}
+ if(c->node && c->node->connection == c) {
+ c->node->connection = NULL;
+ }
-int xrecv(conn_list_t *cl, void *packet)
-{
- vpn_packet_t vp;
- int lenin;
-cp
- do_decrypt((real_packet_t*)packet, &vp, cl->key);
- add_mac_addresses(&vp);
-
- if((lenin = write(tap_fd, &vp, vp.len + sizeof(vp.len))) < 0)
- syslog(LOG_ERR, "Can't write to tap device: %m");
- else
- total_tap_out += lenin;
-cp
- return 0;
-}
+ if(c->edge) {
+ if(report) {
+ send_del_edge(mesh, mesh->everyone, c->edge, 0);
+ }
-/*
- 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
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, "packet to queue: %d", s);
-
- 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
-}
+ edge_del(mesh, c->edge);
+ c->edge = NULL;
-/* 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
-}
+ /* Run MST and SSSP algorithms */
-/*
- 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*,void*))
-{
- 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 > 3)
- syslog(LOG_DEBUG, "queue flushed");
-cp
-}
+ graph(mesh);
-/*
- 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 > 1)
- syslog(LOG_DEBUG, "Flushing send queue for " IP_ADDR_S,
- IP_ADDR_V(cl->vpn_ip));
- flush_queue(cl, &(cl->sq), xsend);
- }
-
- if(cl->rq)
- {
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, "Flushing receive queue for " IP_ADDR_S,
- IP_ADDR_V(cl->vpn_ip));
- flush_queue(cl, &(cl->rq), xrecv);
- }
-cp
-}
+ /* If the node is not reachable anymore but we remember it had an edge to us, clean it up */
-/*
- send a packet to the given vpn ip.
-*/
-int send_packet(ip_t to, vpn_packet_t *packet)
-{
- config_t const *cfg;
- conn_list_t *cl;
-cp
- if(!(cfg = get_config_val(proxymode))) /* In case we are in proxy mode, just send everything to our uplink. */
- cl = conn_list;
- else
- cl = lookup_conn(to);
-
- if((cl = lookup_conn(to)) == NULL)
- {
- if(debug_lvl > 2)
- {
- syslog(LOG_NOTICE, "trying to look up " IP_ADDR_S " in connection list failed.",
- IP_ADDR_V(to));
- }
- for(cl = conn_list; cl != NULL && !cl->status.outgoing; cl = cl->next);
- if(!cl)
- { /* No open outgoing connection has been found. */
- if(debug_lvl > 2)
- syslog(LOG_NOTICE, "There is no remote host I can send this packet to.");
- return -1;
- }
- }
-
- if(my_key_expiry <= time(NULL))
- regenerate_keys();
-
- if(!cl->status.dataopen)
- if(setup_vpn_connection(cl) < 0)
- return -1;
-
- if(!cl->status.validkey)
- {
- add_queue(&(cl->sq), packet, packet->len + 2);
- if(!cl->status.waitingforkey)
- send_key_request(cl->vpn_ip); /* Keys should be sent to the host running the tincd */
- return 0;
- }
-
- if(!cl->status.active)
- {
- add_queue(&(cl->sq), packet, packet->len + 2);
- if(debug_lvl > 1)
- syslog(LOG_INFO, IP_ADDR_S " is not ready, queueing packet.", IP_ADDR_V(cl->vpn_ip));
- return 0; /* We don't want to mess up, do we? */
- }
-
- /* can we send it? can we? can we? huh? */
-cp
- return xsend(cl, packet);
-}
+ if(report && c->node && !c->node->status.reachable) {
+ edge_t *e;
+ e = lookup_edge(c->node, mesh->self);
-int send_broadcast(conn_list_t *cl, vpn_packet_t *packet)
-{
- conn_list_t *p;
-cp
- for(p = cl; p != NULL; p = p->next)
- if(send_packet(p->real_ip, packet) < 0)
- {
- syslog(LOG_ERR, "Could not send a broadcast packet to %08lx (%08lx): %m",
- p->vpn_ip, p->real_ip);
- break; /* FIXME: should retry later, and send a ping over the metaconnection. */
- }
-cp
- return 0;
-}
+ if(e) {
+ send_del_edge(mesh, mesh->everyone, e, 0);
+ edge_del(mesh, e);
+ }
+ }
+ }
-/*
- open the local ethertap device
-*/
-int setup_tap_fd(void)
-{
- int nfd;
- const char *tapfname;
- config_t const *cfg;
-cp
- if((cfg = get_config_val(tapdevice)) == NULL)
- tapfname = "/dev/tap0";
- else
- tapfname = cfg->data.ptr;
-
- if((nfd = open(tapfname, O_RDWR | O_NONBLOCK)) < 0)
- {
- syslog(LOG_ERR, "Could not open %s: %m", tapfname);
- return -1;
- }
-
- tap_fd = nfd;
-cp
- return 0;
-}
+ outgoing_t *outgoing = c->outgoing;
+ connection_del(mesh, c);
-/*
- 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;
-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)))
- {
- syslog(LOG_ERR, "setsockopt: %m");
- return -1;
- }
-
- flags = fcntl(nfd, F_GETFL);
- if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0)
- {
- syslog(LOG_ERR, "fcntl: %m");
- 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)))
- {
- syslog(LOG_ERR, "Can't bind to port %hd/tcp: %m", port);
- return -1;
- }
-
- if(listen(nfd, 3))
- {
- syslog(LOG_ERR, "listen: %m");
- return -1;
- }
-cp
- return nfd;
-}
+ /* Check if this was our outgoing connection */
-/*
- 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)
- {
- syslog(LOG_ERR, "Creating socket failed: %m");
- return -1;
- }
-
- if(setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)))
- {
- syslog(LOG_ERR, "setsockopt: %m");
- return -1;
- }
-
- flags = fcntl(nfd, F_GETFL);
- if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0)
- {
- syslog(LOG_ERR, "fcntl: %m");
- 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)))
- {
- syslog(LOG_ERR, "Can't bind to port %hd/udp: %m", port);
- return -1;
- }
-cp
- return nfd;
+ if(outgoing) {
+ do_outgoing_connection(mesh, outgoing);
+ }
}
/*
- setup an outgoing meta (tcp) socket
+ 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 setup_outgoing_meta_socket(conn_list_t *cl)
-{
- int flags;
- struct sockaddr_in a;
- config_t const *cfg;
-cp
- if((cfg = get_config_val(upstreamport)) == 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 failed: %m");
- return -1;
- }
-
- a.sin_family = AF_INET;
- a.sin_port = htons(cl->port);
- a.sin_addr.s_addr = htonl(cl->real_ip);
-
- if(connect(cl->meta_socket, (struct sockaddr *)&a, sizeof(a)) == -1)
- {
- syslog(LOG_ERR, IP_ADDR_S ":%d: %m", IP_ADDR_V(cl->real_ip), cl->port);
- return -1;
- }
-
- flags = fcntl(cl->meta_socket, F_GETFL);
- if(fcntl(cl->meta_socket, F_SETFL, flags | O_NONBLOCK) < 0)
- {
- syslog(LOG_ERR, "fcntl: %m");
- return -1;
- }
-
- cl->hostname = hostlookup(htonl(cl->real_ip));
-
- syslog(LOG_INFO, "Connected to %s:%hd" , cl->hostname, cl->port);
-cp
- return 0;
-}
+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->status.active && c->last_key_renewal + 3600 < mesh->loop.now.tv_sec) {
+ devtool_sptps_renewal_probe((meshlink_node_t *)c->node);
+
+ if(!sptps_force_kex(&c->sptps)) {
+ logger(mesh, MESHLINK_ERROR, "SPTPS key renewal for connection with %s failed", c->name);
+ terminate_connection(mesh, c, true);
+ continue;
+ } else {
+ c->last_key_renewal = mesh->loop.now.tv_sec;
+ }
+ }
+
+ 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);
+ }
+ }
-/*
- 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(ip_t ip)
-{
- conn_list_t *ncn;
-cp
- ncn = new_conn_list();
- ncn->real_ip = ip;
-
- if(setup_outgoing_meta_socket(ncn) < 0)
- {
- syslog(LOG_ERR, "Could not set up a meta connection.");
- free_conn_element(ncn);
- return -1;
- }
-
- ncn->status.meta = 1;
- ncn->status.outgoing = 1;
- ncn->next = conn_list;
- conn_list = ncn;
-cp
- return 0;
+ timeout_set(&mesh->loop, data, &(struct timespec) {
+ 1, prng(mesh, TIMER_FUDGE)
+ });
}
-/*
- set up the local sockets (listen only)
-*/
-int setup_myself(void)
-{
- config_t const *cfg;
-cp
- myself = new_conn_list();
-
- if(!(cfg = get_config_val(myvpnip)))
- {
- syslog(LOG_ERR, "No value for my VPN IP given");
- return -1;
- }
-
- myself->vpn_ip = cfg->data.ip->ip;
- myself->vpn_mask = cfg->data.ip->mask;
-
- if(!(cfg = get_config_val(listenport)))
- myself->port = 655;
- else
- myself->port = cfg->data.val;
-
- if((myself->meta_socket = setup_listen_meta_socket(myself->port)) < 0)
- {
- syslog(LOG_ERR, "Unable to set up a listening socket");
- return -1;
- }
-
- if((myself->socket = setup_vpn_in_socket(myself->port)) < 0)
- {
- syslog(LOG_ERR, "Unable to set up an incoming vpn data socket");
- close(myself->meta_socket);
- return -1;
- }
-
- myself->status.active = 1;
-
- syslog(LOG_NOTICE, "Ready: listening on port %d.", myself->port);
-cp
- 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;
-/*
- setup all initial network connections
-*/
-int setup_network_connections(void)
-{
- config_t const *cfg;
-cp
- if((cfg = get_config_val(pingtimeout)) == NULL)
- timeout = 10;
- else
- timeout = cfg->data.val;
-
- if(setup_tap_fd() < 0)
- return -1;
-
- if(setup_myself() < 0)
- return -1;
-
- if((cfg = get_config_val(upstreamip)) == NULL)
- /* No upstream IP given, we're listen only. */
- return 0;
-
- if(setup_outgoing_connection(cfg->data.ip->ip))
- return -1;
-cp
- return 0;
-}
+ if(na->devclass < nb->devclass) {
+ return -1;
+ }
-RETSIGTYPE
-sigalrm_handler(int a)
-{
- config_t const *cfg;
- static int seconds_till_retry;
-cp
- cfg = get_config_val(upstreamip);
-
- if(!setup_outgoing_connection(cfg->data.ip->ip))
- {
- signal(SIGALRM, SIG_IGN);
- seconds_till_retry = 5;
- }
- else
- {
- signal(SIGALRM, sigalrm_handler);
- seconds_till_retry += 5;
- alarm(seconds_till_retry);
- syslog(LOG_ERR, "Still failed to connect to other. Will retry in %d seconds.",
- seconds_till_retry);
- }
-cp
-}
+ if(na->devclass > nb->devclass) {
+ return 1;
+ }
-/*
- close all open network connections
-*/
-void close_network_connections(void)
-{
- conn_list_t *p;
-cp
- for(p = conn_list; p != NULL; p = p->next)
- {
- if(p->status.dataopen)
- {
- shutdown(p->socket, 0); /* No more receptions */
- close(p->socket);
+ if(na->last_successfull_connection == nb->last_successfull_connection) {
+ return 0;
}
- if(p->status.meta)
- {
- send_termreq(p);
- shutdown(p->meta_socket, 0); /* No more receptions */
- close(p->meta_socket);
- }
- }
-
- if(myself)
- if(myself->status.active)
- {
- close(myself->meta_socket);
- close(myself->socket);
- }
-
- close(tap_fd);
- 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;
-cp
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, "Opening UDP socket to " IP_ADDR_S, IP_ADDR_V(cl->real_ip));
-
- nfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
- if(nfd == -1)
- {
- syslog(LOG_ERR, "Creating data socket failed: %m");
- return -1;
- }
-
- a.sin_family = AF_INET;
- a.sin_port = htons(cl->port);
- a.sin_addr.s_addr = htonl(cl->real_ip);
-
- if(connect(nfd, (struct sockaddr *)&a, sizeof(a)) == -1)
- {
- syslog(LOG_ERR, "Create connection to %08lx:%d failed: %m", ntohs(cl->real_ip),
- cl->port);
- return -1;
- }
-
- flags = fcntl(nfd, F_GETFL);
- if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0)
- {
- syslog(LOG_ERR, "This is a bug: %s:%d: %d:%m", __FILE__, __LINE__, nfd);
- return -1;
- }
-
- cl->socket = nfd;
- cl->status.dataopen = 1;
-cp
- return 0;
-}
+ if(na->last_successfull_connection == 0 || na->last_successfull_connection > nb->last_successfull_connection) {
+ return -1;
+ }
-/*
- handle an incoming tcp connect call and open
- a connection to it.
-*/
-conn_list_t *create_new_connection(int sfd)
-{
- conn_list_t *p;
- struct sockaddr_in ci;
- int len = sizeof(ci);
-cp
- p = new_conn_list();
-
- if(getpeername(sfd, &ci, &len) < 0)
- {
- syslog(LOG_ERR, "Error: getpeername: %m");
- return NULL;
- }
-
- p->hostname = hostlookup(ci.sin_addr.s_addr);
- p->real_ip = ntohl(ci.sin_addr.s_addr);
- p->meta_socket = sfd;
- p->status.meta = 1;
- p->buflen = 0;
-
- syslog(LOG_NOTICE, "Connection from %s:%d", p->hostname, htons(ci.sin_port));
-
- if(send_basic_info(p) < 0)
- {
- free(p);
- return NULL;
- }
-cp
- return p;
-}
+ if(nb->last_successfull_connection == 0 || na->last_successfull_connection < nb->last_successfull_connection) {
+ return 1;
+ }
-/*
- 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(myself->socket, fs);
- FD_SET(tap_fd, fs);
-cp
+ if(na < nb) {
+ return -1;
+ }
+
+ if(na > nb) {
+ return 1;
+ }
+
+ return 0;
}
-/*
- 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)
-{
- real_packet_t rp;
- int lenin;
- int x, l = sizeof(x);
- conn_list_t *f;
-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", sys_errlist[x]);
- return -1;
- }
-
- rp.len = -1;
- lenin = recvfrom(cl->socket, &rp, MTU, 0, NULL, NULL);
- if(lenin <= 0)
- {
- syslog(LOG_ERR, "Receiving data failed: %m");
- return -1;
- }
- total_socket_in += lenin;
-
- rp.data.len = ntohs(rp.data.len);
- rp.len = ntohs(rp.len);
- rp.from = ntohl(rp.from);
-
- if(rp.len >= 0)
- {
- f = lookup_conn(rp.from);
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, "packet from " IP_ADDR_S " (len %d)",
- IP_ADDR_V(rp.from), rp.len);
- if(!f)
- {
- syslog(LOG_ERR, "Got packet from unknown source " IP_ADDR_S,
- IP_ADDR_V(rp.from));
- return -1;
+// 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;
}
- if(f->status.validkey)
- xrecv(f, &rp);
- else
- {
- add_queue(&(f->rq), &rp, rp.len);
- if(!cl->status.waitingforkey)
- send_key_request(rp.from);
+ if(na->last_successfull_connection == 0 || na->last_successfull_connection > nb->last_successfull_connection) {
+ return -1;
}
- if(my_key_expiry <= time(NULL))
- regenerate_keys();
- }
-cp
- return 0;
-}
+ if(nb->last_successfull_connection == 0 || na->last_successfull_connection < nb->last_successfull_connection) {
+ return 1;
+ }
-/*
- terminate a connection and notify the other
- end before closing the sockets
-*/
-void terminate_connection(conn_list_t *cl)
-{
-cp
- if(cl->status.remove)
- return;
-
- if(debug_lvl > 0)
- syslog(LOG_NOTICE, "Closing connection with %s.", cl->hostname);
-
- if(cl->status.timeout)
- send_timeout(cl);
- else if(!cl->status.termreq)
- send_termreq(cl);
-
- close(cl->socket);
- if(cl->status.meta)
- close(cl->meta_socket);
-
- if(cl->status.outgoing)
- {
- alarm(5);
- signal(SIGALRM, sigalrm_handler);
- syslog(LOG_NOTICE, "Try to re-establish outgoing connection in 5 seconds.");
- }
-
- cl->status.remove = 1;
-cp
-}
+ if(na < nb) {
+ return -1;
+ }
-/*
- send out a ping request to all active
- connections
-*/
-int send_broadcast_ping(void)
-{
- conn_list_t *p;
-cp
- for(p = conn_list; p != NULL; p = p->next)
- {
- if(p->status.remove)
- continue;
- if(p->status.active && p->status.meta)
- {
- if(send_ping(p))
- terminate_connection(p);
- else
- {
- p->status.pinged = 1;
- p->status.got_pong = 0;
- }
+ if(na > nb) {
+ return 1;
}
- }
- last_ping_time = time(NULL);
-cp
- return 0;
+ return 0;
}
-/*
- end all connections that did not respond
- to the ping probe in time
-*/
-int check_dead_connections(void)
-{
- conn_list_t *p;
-cp
- for(p = conn_list; p != NULL; p = p->next)
- {
- if(p->status.remove)
- continue;
- if(p->status.active && p->status.meta && p->status.pinged && !p->status.got_pong)
- {
- syslog(LOG_INFO, "%s (" IP_ADDR_S ") didn't respond to ping",
- p->hostname, IP_ADDR_V(p->vpn_ip));
- p->status.timeout = 1;
- terminate_connection(p);
+// devclass desc
+static int node_compare_devclass_desc(const void *a, const void *b) {
+ const node_t *na = a, *nb = b;
+
+ if(na->devclass < nb->devclass) {
+ return -1;
+ }
+
+ if(na->devclass > nb->devclass) {
+ return 1;
+ }
+
+ if(na < nb) {
+ return -1;
+ }
+
+ if(na > nb) {
+ return 1;
}
- }
-cp
- return 0;
+
+ return 0;
}
+
/*
- accept a new tcp connect and create a
- new connection
-*/
-int handle_new_meta_connection(conn_list_t *cl)
+
+autoconnect()
{
- conn_list_t *ncn;
- struct sockaddr client;
- int nfd, len = sizeof(client);
-cp
- if((nfd = accept(cl->meta_socket, &client, &len)) < 0)
- {
- syslog(LOG_ERR, "Accepting a new connection failed: %m");
- return -1;
- }
-
- if((ncn = create_new_connection(nfd)) == NULL)
- {
- shutdown(nfd, 2);
- close(nfd);
- syslog(LOG_NOTICE, "Closed attempted connection.");
- return 0;
- }
-
- ncn->status.meta = 1;
- ncn->next = conn_list;
- conn_list = ncn;
-cp
- return 0;
+ timeout = 5
+
+ // find the best one for initial connect
+
+ if cur < min
+ newcon =
+ first from nodes
+ where dclass <= my.dclass and !connection and (timestamp - last_retry) > retry_timeout
+ order by dclass asc, last_connection desc
+ if newcon
+ timeout = 0
+ goto connect
+
+
+ // find better nodes to connect to: in case we have less than min connections within [BACKBONE, i] and there are nodes which we are not connected to within the range
+
+ if min <= cur < max
+ j = 0
+ for i = BACKBONE to my.dclass
+ j += count(from connections where node.dclass = i)
+ if j < min
+ newcon =
+ first from nodes
+ where dclass = i and !connection and (timestamp - last_retry) > retry_timeout
+ order by last_connection desc
+ if newcon
+ goto connect
+ else
+ break
+
+
+ // heal partitions
+
+ if min <= cur < max
+ newcon =
+ first from nodes
+ where dclass <= my.dclass and !reachable and (timestamp - last_retry) > retry_timeout
+ order by dclass asc, last_connection desc
+ if newcon
+ goto connect
+
+
+ // connect
+
+connect:
+ if newcon
+ connect newcon
+
+
+ // disconnect outgoing connections in case we have more than min connections within [BACKBONE, i] and there are nodes which we are connected to within the range [i, PORTABLE]
+
+ if min < cur <= max
+ j = 0
+ for i = BACKBONE to my.dclass
+ j += count(from connections where node.dclass = i)
+ if min < j
+ delcon =
+ first from nodes
+ where dclass >= i and outgoing_connection
+ order by dclass desc
+ if disconnect
+ goto disconnect
+ else
+ break
+
+
+ // disconnect connections in case we have more than enough connections
+
+ if max < cur
+ delcon =
+ first from nodes
+ where outgoing_connection
+ order by dclass desc
+ goto disconnect
+
+ // disconnect
+
+disconnect
+ if delcon
+ disconnect delcon
+
+
+ // next iteration
+ next (timeout, autoconnect)
+
}
-/*
- dispatch any incoming meta requests
*/
-int handle_incoming_meta_data(conn_list_t *cl)
-{
- int x, l = sizeof(x);
- int request, oldlen, i;
- int lenin = 0;
-cp
- if(getsockopt(cl->meta_socket, SOL_SOCKET, SO_ERROR, &x, &l) < 0)
- {
- syslog(LOG_ERR, "This is a bug: %s:%d: %d:%m", __FILE__, __LINE__, cl->meta_socket);
- return -1;
- }
- if(x)
- {
- syslog(LOG_ERR, "Metadata socket error: %s", sys_errlist[x]);
- return -1;
- }
-
- if(cl->buflen >= MAXBUFSIZE)
- {
- syslog(LOG_ERR, "Metadata read buffer full! Discarding contents.");
- cl->buflen = 0;
- }
-
- lenin = read(cl->meta_socket, cl->buffer, MAXBUFSIZE-cl->buflen);
-
- if(lenin<=0)
- {
- syslog(LOG_ERR, "Metadata socket read error: %m");
- return -1;
- }
-
- oldlen = cl->buflen;
- cl->buflen += lenin;
-
- for(;;)
- {
- cl->reqlen = 0;
-
- for(i = oldlen; i < cl->buflen; i++)
- {
- if(cl->buffer[i] == '\n')
- {
- cl->buffer[i] = 0; /* replace end-of-line by end-of-string so we can use sscanf */
- cl->reqlen = i + 1;
- break;
- }
- }
-
- if(cl->reqlen)
- {
- if(sscanf(cl->buffer, "%d", &request) == 1)
- {
- if(request_handlers[request] == NULL)
- {
- syslog(LOG_ERR, "Unknown request: %s", cl->buffer);
- return 0;
- }
-
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, "Got request: %s", cl->buffer);
-
- request_handlers[request](cl);
- }
- else
- {
- syslog(LOG_ERR, "Bogus data received: %s", cl->buffer);
- }
-
- cl->buflen -= cl->reqlen;
- memmove(cl->buffer, cl->buffer + cl->reqlen, cl->buflen);
- oldlen = 0;
- }
- else
- {
- break;
- }
- }
-cp
- return 0;
+
+
+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};
+ nanosleep(&ts, NULL);
+ mesh->sleeptime *= 2;
+
+ if(mesh->sleeptime < 0) {
+ mesh->sleeptime = 3600;
+ }
+ } else {
+ mesh->sleeptime /= 2;
+
+ if(mesh->sleeptime < 10) {
+ mesh->sleeptime = 10;
+ }
+ }
+
+ 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);
+ devtool_sptps_renewal_probe((meshlink_node_t *)n);
+
+ 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 = -3600;
+ } 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;
- int x, l = sizeof(x);
-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))
- {
- /*
- The only thing that can happen to get us here is apparently an
- error on this outgoing(!) UDP socket that isn't immediate (i.e.
- something that will not trigger an error directly on send()).
- I've once got here when it said `No route to host'.
- */
- getsockopt(p->socket, SOL_SOCKET, SO_ERROR, &x, &l);
- syslog(LOG_ERR, "Outgoing data socket error: %s", sys_errlist[x]);
- terminate_connection(p);
- return;
- }
-
- if(p->status.meta)
- if(FD_ISSET(p->meta_socket, f))
- if(handle_incoming_meta_data(p) < 0)
- {
- terminate_connection(p);
- return;
- }
- }
-
- if(FD_ISSET(myself->socket, f))
- handle_incoming_vpn_data(myself);
-
- if(FD_ISSET(myself->meta_socket, f))
- handle_new_meta_connection(myself);
-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;
- ip_t from, to;
- int ether_type, lenin;
-cp
- memset(&vp, 0, sizeof(vp));
- if((lenin = read(tap_fd, &vp, MTU)) <= 0)
- {
- syslog(LOG_ERR, "Error while reading from tapdevice: %m");
- return;
- }
-
- total_tap_in += lenin;
-
- ether_type = ntohs(*((unsigned short*)(&vp.data[12])));
- if(ether_type != 0x0800)
- {
- if(debug_lvl > 0)
- syslog(LOG_INFO, "Non-IP ethernet frame %04x from " MAC_ADDR_S,
- ether_type, MAC_ADDR_V(vp.data[6]));
- return;
- }
-
- if(lenin < 32)
- {
- if(debug_lvl > 0)
- syslog(LOG_INFO, "Dropping short packet");
- return;
- }
-
- from = ntohl(*((unsigned long*)(&vp.data[26])));
- to = ntohl(*((unsigned long*)(&vp.data[30])));
-
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, "An IP packet (%04x) for " IP_ADDR_S " from " IP_ADDR_S,
- ether_type, IP_ADDR_V(to), IP_ADDR_V(from));
- if(debug_lvl > 4)
- syslog(LOG_DEBUG, MAC_ADDR_S " to " MAC_ADDR_S,
- MAC_ADDR_V(vp.data[0]), MAC_ADDR_V(vp.data[6]));
-
- vp.len = (length_t)lenin - 2;
-
- strip_mac_addresses(&vp);
-
- send_packet(to, &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 = -3600;
+ }
+
+ 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;
-cp
- last_ping_time = 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 */
- continue;
- syslog(LOG_ERR, "Error while waiting for input: %m");
- return;
- }
-
- if(r == 0 || last_ping_time + timeout < time(NULL))
- /* Timeout... hm... something might be wrong. */
- {
- check_dead_connections();
- send_broadcast_ping();
- continue;
+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);
}
- check_network_activity(&fset);
-
- /* local tap data */
- if(FD_ISSET(tap_fd, &fset))
- handle_tap_input();
- }
-cp
+ signal_del(&mesh->loop, &mesh->datafromapp);
+ timeout_del(&mesh->loop, &mesh->periodictimer);
+ timeout_del(&mesh->loop, &mesh->pingtimer);
}
projects / meshlink / blobdiff