/*
net.c -- most of the network code
- Copyright (C) 1998,1999,2000 Ivo Timmermans <itimmermans@bigfoot.com>,
- 2000 Guus Sliepen <guus@sliepen.warande.net>
+ Copyright (C) 1998-2005 Ivo Timmermans,
+ 2000-2012 Guus Sliepen <guus@tinc-vpn.org>
+ 2006 Scott Lamb <slamb@slamb.org>
+ 2011 Loïc Grenié <loic.grenie@gmail.com>
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.
-
- $Id: net.c,v 1.35.4.35 2000/10/14 17:04:13 guus 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 <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 <utils.h>
-#include <xalloc.h>
+#include "system.h"
+
+#include <openssl/rand.h>
+#include "utils.h"
+#include "avl_tree.h"
#include "conf.h"
-#include "encr.h"
+#include "connection.h"
+#include "device.h"
+#include "event.h"
+#include "graph.h"
+#include "logger.h"
+#include "meta.h"
#include "net.h"
#include "netutl.h"
+#include "process.h"
#include "protocol.h"
-#include "meta.h"
+#include "route.h"
+#include "subnet.h"
+#include "xalloc.h"
+
+bool do_purge = false;
+volatile bool running = false;
+#ifdef HAVE_PSELECT
+bool graph_dump = false;
+#endif
+
+time_t now = 0;
+int contradicting_add_edge = 0;
+int contradicting_del_edge = 0;
+static int sleeptime = 10;
+
+/* Purge edges and subnets of unreachable nodes. Use carefully. */
+
+static void purge(void) {
+ avl_node_t *nnode, *nnext, *enode, *enext, *snode, *snext;
+ node_t *n;
+ edge_t *e;
+ subnet_t *s;
+
+ ifdebug(PROTOCOL) logger(LOG_DEBUG, "Purging unreachable nodes");
+
+ /* Remove all edges and subnets owned by unreachable nodes. */
+
+ for(nnode = node_tree->head; nnode; nnode = nnext) {
+ nnext = nnode->next;
+ n = nnode->data;
+
+ if(!n->status.reachable) {
+ ifdebug(SCARY_THINGS) logger(LOG_DEBUG, "Purging node %s (%s)", n->name,
+ n->hostname);
+
+ for(snode = n->subnet_tree->head; snode; snode = snext) {
+ snext = snode->next;
+ s = snode->data;
+ send_del_subnet(everyone, s);
+ if(!strictsubnets)
+ subnet_del(n, s);
+ }
+
+ for(enode = n->edge_tree->head; enode; enode = enext) {
+ enext = enode->next;
+ e = enode->data;
+ if(!tunnelserver)
+ send_del_edge(everyone, e);
+ edge_del(e);
+ }
+ }
+ }
-#include "system.h"
+ /* Check if anyone else claims to have an edge to an unreachable node. If not, delete node. */
-int tap_fd = -1;
+ for(nnode = node_tree->head; nnode; nnode = nnext) {
+ nnext = nnode->next;
+ n = nnode->data;
-int total_tap_in = 0;
-int total_tap_out = 0;
-int total_socket_in = 0;
-int total_socket_out = 0;
+ if(!n->status.reachable) {
+ for(enode = edge_weight_tree->head; enode; enode = enext) {
+ enext = enode->next;
+ e = enode->data;
-int upstreamindex = 0;
-static int seconds_till_retry;
+ if(e->to == n)
+ break;
+ }
-/*
- strip off the MAC adresses of an ethernet frame
-*/
-void strip_mac_addresses(vpn_packet_t *p)
-{
-cp
- memmove(p->data, p->data + 12, p->len -= 12);
-cp
+ if(!enode && (!strictsubnets || !n->subnet_tree->head))
+ /* in strictsubnets mode do not delete nodes with subnets */
+ node_del(n);
+ }
+ }
}
/*
- reassemble MAC addresses
+ put all file descriptors in an fd_set array
+ While we're at it, purge stuff that needs to be removed.
*/
-void add_mac_addresses(vpn_packet_t *p)
-{
-cp
- memcpy(p->data + 12, p->data, p->len);
- p->len += 12;
- p->data[0] = p->data[6] = 0xfe;
- p->data[1] = p->data[7] = 0xfd;
- /* Really evil pointer stuff just below! */
- *((ip_t*)(&p->data[2])) = (ip_t)(htonl(myself->address));
- *((ip_t*)(&p->data[8])) = *((ip_t*)(&p->data[26]));
-cp
-}
+static int build_fdset(fd_set *readset, fd_set *writeset) {
+ avl_node_t *node, *next;
+ connection_t *c;
+ int i, max = 0;
+
+ FD_ZERO(readset);
+ FD_ZERO(writeset);
+
+ for(node = connection_tree->head; node; node = next) {
+ next = node->next;
+ c = node->data;
+
+ if(c->status.remove) {
+ connection_del(c);
+ if(!connection_tree->head)
+ purge();
+ } else {
+ FD_SET(c->socket, readset);
+ if(c->outbuflen > 0)
+ FD_SET(c->socket, writeset);
+ if(c->socket > max)
+ max = c->socket;
+ }
+ }
-int xsend(conn_list_t *cl, vpn_packet_t *inpkt)
-{
- vpn_packet_t outpkt;
- int outlen, outpad;
-cp
- outpkt.len = inpkt->len;
- EVP_EncryptInit(cl->cipher_pktctx, cl->cipher_pkttype, cl->cipher_pktkey, NULL);
- EVP_EncryptUpdate(cl->cipher_pktctx, outpkt.data, &outlen, inpkt->data, inpkt->len);
- EVP_EncryptFinal(cl->cipher_pktctx, outpkt.data + outlen, &outpad);
- outlen += outpad;
-
- if(debug_lvl > 3)
- syslog(LOG_ERR, _("Sending packet of %d bytes to %s (%s)"),
- outlen, cl->name, cl->hostname);
-
- total_socket_out += outlen;
-
- cl->want_ping = 1;
-
- if((send(cl->socket, (char *) &(outpkt.len), outlen + 2, 0)) < 0)
- {
- syslog(LOG_ERR, _("Error sending packet to %s (%s): %m"),
- cl->name, cl->hostname);
- return -1;
- }
-cp
- return 0;
-}
+ for(i = 0; i < listen_sockets; i++) {
+ FD_SET(listen_socket[i].tcp, readset);
+ if(listen_socket[i].tcp > max)
+ max = listen_socket[i].tcp;
+ FD_SET(listen_socket[i].udp, readset);
+ if(listen_socket[i].udp > max)
+ max = listen_socket[i].udp;
+ }
-int xrecv(vpn_packet_t *inpkt)
-{
- vpn_packet_t outpkt;
- int outlen, outpad;
-cp
- if(debug_lvl > 3)
- syslog(LOG_ERR, _("Receiving packet of %d bytes"),
- inpkt->len);
-
- outpkt.len = inpkt->len;
- EVP_DecryptInit(myself->cipher_pktctx, myself->cipher_pkttype, myself->cipher_pktkey, NULL);
- EVP_DecryptUpdate(myself->cipher_pktctx, outpkt.data, &outlen, inpkt->data, inpkt->len);
- /* FIXME: grok DecryptFinal
- EVP_DecryptFinal(myself->cipher_pktctx, outpkt.data + outlen, &outpad);
- */
-
- add_mac_addresses(&outpkt);
-
- if(write(tap_fd, outpkt.data, outpkt.len) < 0)
- syslog(LOG_ERR, _("Can't write to tap device: %m"));
- else
- total_tap_out += outpkt.len;
-cp
- return 0;
+ if(device_fd >= 0)
+ FD_SET(device_fd, readset);
+ if(device_fd > max)
+ max = device_fd;
+
+ return max;
}
/*
- add the given packet of size s to the
- queue q, be it the send or receive queue
+ Terminate a connection:
+ - Close the socket
+ - Remove associated edge and tell other connections about it if report = true
+ - Check if we need to retry making an outgoing connection
+ - Deactivate the host
*/
-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
-}
+void terminate_connection(connection_t *c, bool report) {
+ if(c->status.remove)
+ return;
-/* 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
-}
+ ifdebug(CONNECTIONS) logger(LOG_NOTICE, "Closing connection with %s (%s)",
+ c->name, c->hostname);
-/*
- 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
-}
+ c->status.remove = true;
+ c->status.active = false;
-/*
- 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 > 3)
- 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 > 3)
- syslog(LOG_DEBUG, _("Flushing receive queue for %s (%s)"),
- cl->name, cl->hostname);
- flush_queue(cl, &(cl->rq), xrecv);
- }
-cp
-}
+ if(c->node)
+ c->node->connection = NULL;
-/*
- send a packet to the given vpn ip.
-*/
-int send_packet(ip_t to, vpn_packet_t *packet)
-{
- conn_list_t *cl;
-cp
- if((cl = lookup_conn_list_ipv4(to)) == NULL)
- {
- if(debug_lvl > 3)
- {
- syslog(LOG_NOTICE, _("Trying to look up %d.%d.%d.%d in connection list failed!"),
- 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. */
-
- 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)
- {
- if(debug_lvl > 3)
- 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)
- {
- if(debug_lvl > 3)
- 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? */
- }
-
- /* can we send it? can we? can we? huh? */
-cp
- return xsend(cl, packet);
-}
+ if(c->socket)
+ closesocket(c->socket);
-/*
- 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(config, 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;
-}
+ if(c->edge) {
+ if(report && !tunnelserver)
+ send_del_edge(everyone, c->edge);
-/*
- 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)))
- {
- syslog(LOG_ERR, _("setsockopt: %m"));
- return -1;
- }
-
- if(setsockopt(nfd, SOL_SOCKET, SO_KEEPALIVE, &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;
- }
-
- if((cfg = get_config_val(config, interface)))
- {
- if(setsockopt(nfd, SOL_SOCKET, SO_KEEPALIVE, cfg->data.ptr, strlen(cfg->data.ptr)))
- {
- 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, interfaceip)))
- a.sin_addr.s_addr = htonl(cfg->data.ip->ip);
- else
- 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;
-}
+ edge_del(c->edge);
-/*
- 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;
-}
+ /* Run MST and SSSP algorithms */
-/*
- 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 > 0)
- syslog(LOG_INFO, _("Trying to connect to %s"), cl->hostname);
-
- if((cfg = get_config_val(cl->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)
- {
- 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)
- {
- syslog(LOG_ERR, _("fcntl for %s port %d: %m"),
- cl->hostname, cl->port);
- return -1;
- }
-
- if(debug_lvl > 0)
- syslog(LOG_INFO, _("Connected to %s port %hd"),
- cl->hostname, cl->port);
-cp
- return 0;
-}
+ graph();
-/*
- 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 *hostname)
-{
- conn_list_t *ncn;
- struct hostent *h;
-cp
- if(!(h = gethostbyname(hostname)))
- {
- syslog(LOG_ERR, _("Error looking up `%s': %m"), hostname);
- return -1;
- }
-
- ncn = new_conn_list();
- 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.meta = 1;
- ncn->status.outgoing = 1;
- ncn->next = conn_list;
- conn_list = ncn;
-cp
- return 0;
-}
+ /* If the node is not reachable anymore but we remember it had an edge to us, clean it up */
-/*
- set up the local sockets (listen only)
-*/
-int setup_myself(void)
-{
- config_t const *cfg;
-cp
- myself = new_conn_list();
-
- asprintf(&myself->hostname, "MYSELF"); /* FIXME? Do hostlookup on ourselves? */
- myself->flags = 0;
-
- if(!(cfg = get_config_val(config, tincname))) /* Not acceptable */
- {
- syslog(LOG_ERR, _("Name for tinc daemon required!"));
- return -1;
- }
- else
- myself->name = (char*)cfg->data.val;
-
- if(check_id(myself->name))
- {
- syslog(LOG_ERR, _("Invalid name for myself!"));
- return -1;
- }
-
- if(read_host_config(myself))
- {
- syslog(LOG_ERR, _("Cannot open host configuration file for myself!"));
- return -1;
- }
-
- if(!(cfg = get_config_val(myself->config, port)))
- myself->port = 655;
- else
- myself->port = cfg->data.val;
-
- if((cfg = get_config_val(myself->config, indirectdata)))
- if(cfg->data.val == stupid_true)
- myself->flags |= EXPORTINDIRECTDATA;
-
- if((cfg = get_config_val(myself->config, tcponly)))
- if(cfg->data.val == stupid_true)
- myself->flags |= TCPONLY;
-
- 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 %hd"), myself->port);
-cp
- return 0;
-}
-
-RETSIGTYPE
-sigalrm_handler(int a)
-{
- config_t const *cfg;
-cp
-/* FIXME! Use name instead of upstreamip.
- cfg = get_next_config_val(config, upstreamip, upstreamindex++);
-*/
- while(cfg)
- {
- if(!setup_outgoing_connection(cfg->data.ptr)) /* function returns 0 when there are no problems */
- {
- signal(SIGALRM, SIG_IGN);
- return;
- }
-// cfg = get_next_config_val(config, upstreamip, upstreamindex++); /* Or else we try the next ConnectTo line */
- }
-
- signal(SIGALRM, sigalrm_handler);
- upstreamindex = 0;
- 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
-}
-
-/*
- setup all initial network connections
-*/
-int setup_network_connections(void)
-{
- config_t const *cfg;
-cp
- if((cfg = get_config_val(config, pingtimeout)) == NULL)
- timeout = 5;
- else
- timeout = cfg->data.val;
-
- if(setup_tap_fd() < 0)
- return -1;
-
- if(setup_myself() < 0)
- return -1;
-
-// if((cfg = get_next_config_val(config, upstreamip, upstreamindex++)) == NULL)
- /* No upstream IP given, we're listen only. */
- return 0;
-
- while(cfg)
- {
- if(!setup_outgoing_connection(cfg->data.ptr)) /* function returns 0 when there are no problems */
- return 0;
-// cfg = get_next_config_val(config, upstreamip, upstreamindex++); /* Or else we try the next ConnectTo line */
- }
-
- signal(SIGALRM, sigalrm_handler);
- upstreamindex = 0;
- 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;
-}
-
-/*
- 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(report && !c->node->status.reachable) {
+ edge_t *e;
+ e = lookup_edge(c->node, myself);
+ if(e) {
+ if(!tunnelserver)
+ send_del_edge(everyone, e);
+ edge_del(e);
+ }
+ }
}
- if(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 > 0)
- 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;
- }
-
- 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)
- {
- 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)
- {
- 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;
-}
+ free_connection_partially(c);
-/*
- 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->address = ntohl(ci.sin_addr.s_addr);
- p->hostname = hostlookup(ci.sin_addr.s_addr);
- p->meta_socket = sfd;
- p->status.meta = 1;
- p->buflen = 0;
- p->last_ping_time = time(NULL);
- p->want_ping = 0;
-
- if(debug_lvl > 0)
- syslog(LOG_NOTICE, _("Connection from %s port %d"),
- p->hostname, htons(ci.sin_port));
-
- if(send_id(p) < 0)
- {
- free_conn_list(p);
- return NULL;
- }
-cp
- return p;
-}
-
-/*
- 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
-}
+ /* Check if this was our outgoing connection */
-/*
- receive incoming data from the listening
- udp socket and write it to the ethertap
- device after being decrypted
-*/
-int handle_incoming_vpn_data()
-{
- vpn_packet_t pkt;
- int lenin;
- int x, l = sizeof(x);
-cp
- if(getsockopt(myself->socket, SOL_SOCKET, SO_ERROR, &x, &l) < 0)
- {
- syslog(LOG_ERR, _("This is a bug: %s:%d: %d:%m"),
- __FILE__, __LINE__, myself->socket);
- return -1;
- }
- if(x)
- {
- syslog(LOG_ERR, _("Incoming data socket error: %s"), strerror(x));
- return -1;
- }
-
- if(recvfrom(myself->socket, (char *) &(pkt.len), MTU, 0, NULL, NULL) <= 0)
- {
- syslog(LOG_ERR, _("Receiving packet failed: %m"));
- return -1;
- }
-
-cp
- return xrecv(&pkt);
-}
-
-/*
- terminate a connection and notify the other
- end before closing the sockets
-*/
-void terminate_connection(conn_list_t *cl)
-{
- conn_list_t *p;
-
-cp
- if(cl->status.remove)
- return;
-
- if(debug_lvl > 0)
- 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);
-
- cl->status.remove = 1;
-
- /* If this cl isn't active, don't send any DEL_HOSTs. */
-
-/* FIXME: reprogram this.
- if(cl->status.active)
- notify_others(cl,NULL,send_del_host);
-*/
-
-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))
- {
- if(cl->status.active && p->status.active)
-/* FIXME: reprogram this
- notify_others(p,cl,send_del_host);
-*/;
- if(cl->socket)
- close(cl->socket);
- p->status.active = 0;
- p->status.remove = 1;
- }
- }
-
- cl->status.active = 0;
-
- if(cl->status.outgoing)
- {
- signal(SIGALRM, sigalrm_handler);
- seconds_till_retry = 5;
- alarm(seconds_till_retry);
- syslog(LOG_NOTICE, _("Trying to re-establish outgoing connection in 5 seconds"));
- }
-cp
+ if(c->outgoing) {
+ c->status.remove = false;
+ do_outgoing_connection(c);
+ }
}
/*
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.remove)
- continue;
- if(p->status.active && p->status.meta)
- {
- if(p->last_ping_time + timeout < now)
- {
- if(p->status.pinged && !p->status.got_pong)
- {
- if(debug_lvl > 1)
- syslog(LOG_INFO, _("%s (%s) didn't respond to PING"),
- p->name, p->hostname);
- p->status.timeout = 1;
- terminate_connection(p);
- }
- else if(p->want_ping)
- {
- send_ping(p);
- p->last_ping_time = now;
- p->status.pinged = 1;
- p->status.got_pong = 0;
- }
- }
+static void check_dead_connections(void) {
+ avl_node_t *node, *next;
+ connection_t *c;
+
+ for(node = connection_tree->head; node; node = next) {
+ next = node->next;
+ c = node->data;
+
+ if(c->last_ping_time + pingtimeout <= now) {
+ if(c->status.active) {
+ if(c->status.pinged) {
+ ifdebug(CONNECTIONS) logger(LOG_INFO, "%s (%s) didn't respond to PING in %ld seconds",
+ c->name, c->hostname, (long)now - c->last_ping_time);
+ c->status.timeout = true;
+ terminate_connection(c, true);
+ } else if(c->last_ping_time + pinginterval <= now) {
+ send_ping(c);
+ }
+ } else {
+ if(c->status.remove) {
+ logger(LOG_WARNING, "Old connection_t for %s (%s) status %04x still lingering, deleting...",
+ c->name, c->hostname, bitfield_to_int(&c->status, sizeof c->status));
+ connection_del(c);
+ continue;
+ }
+ ifdebug(CONNECTIONS) logger(LOG_WARNING, "Timeout from %s (%s) during authentication",
+ c->name, c->hostname);
+ if(c->status.connecting) {
+ c->status.connecting = false;
+ closesocket(c->socket);
+ do_outgoing_connection(c);
+ } else {
+ terminate_connection(c, false);
+ }
+ }
+ }
+
+ if(c->outbuflen > 0 && c->last_flushed_time + pingtimeout <= now) {
+ if(c->status.active) {
+ ifdebug(CONNECTIONS) logger(LOG_INFO,
+ "%s (%s) could not flush for %ld seconds (%d bytes remaining)",
+ c->name, c->hostname, (long)now - c->last_flushed_time, c->outbuflen);
+ c->status.timeout = true;
+ terminate_connection(c, true);
+ }
+ }
}
- }
-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;
- }
-
- ncn->status.meta = 1;
- ncn->next = conn_list;
- conn_list = ncn;
-cp
- return 0;
}
/*
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 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->socket, f))
- handle_incoming_vpn_data();
-
- if(FD_ISSET(myself->meta_socket, f))
- handle_new_meta_connection();
-cp
-}
+static void check_network_activity(fd_set * readset, fd_set * writeset) {
+ connection_t *c;
+ avl_node_t *node;
+ int result, i;
+ socklen_t len = sizeof(result);
+ vpn_packet_t packet;
+ static int errors = 0;
+
+ /* check input from kernel */
+ if(device_fd >= 0 && FD_ISSET(device_fd, readset)) {
+ if(devops.read(&packet)) {
+ if(packet.len) {
+ errors = 0;
+ packet.priority = 0;
+ route(myself, &packet);
+ }
+ } else {
+ usleep(errors * 50000);
+ errors++;
+ if(errors > 10) {
+ logger(LOG_ERR, "Too many errors from %s, exiting!", device);
+ running = false;
+ }
+ }
+ }
-/*
- 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 > 3)
- syslog(LOG_INFO, _("Non-IP ethernet frame %04x from %02x:%02x:%02x:%02x:%02x:%02x"), ether_type, MAC_ADDR_V(vp.data[6]));
- return;
- }
-
- if(lenin < 32)
- {
- if(debug_lvl > 3)
- syslog(LOG_INFO, _("Dropping short packet from %02x:%02x:%02x:%02x:%02x:%02x"), MAC_ADDR_V(vp.data[6]));
- return;
- }
-
- from = ntohl(*((unsigned long*)(&vp.data[26])));
- to = ntohl(*((unsigned long*)(&vp.data[30])));
-
- vp.len = (length_t)lenin - 2;
-
- strip_mac_addresses(&vp);
-
- send_packet(to, &vp);
-cp
+ /* check meta connections */
+ for(node = connection_tree->head; node; node = node->next) {
+ c = node->data;
+
+ if(c->status.remove)
+ continue;
+
+ if(FD_ISSET(c->socket, readset)) {
+ if(c->status.connecting) {
+ c->status.connecting = false;
+ getsockopt(c->socket, SOL_SOCKET, SO_ERROR, (void *)&result, &len);
+
+ if(!result)
+ finish_connecting(c);
+ else {
+ ifdebug(CONNECTIONS) logger(LOG_DEBUG,
+ "Error while connecting to %s (%s): %s",
+ c->name, c->hostname, sockstrerror(result));
+ closesocket(c->socket);
+ do_outgoing_connection(c);
+ continue;
+ }
+ }
+
+ if(!receive_meta(c)) {
+ terminate_connection(c, c->status.active);
+ continue;
+ }
+ }
+
+ if(FD_ISSET(c->socket, writeset)) {
+ if(!flush_meta(c)) {
+ terminate_connection(c, c->status.active);
+ continue;
+ }
+ }
+ }
+
+ for(i = 0; i < listen_sockets; i++) {
+ if(FD_ISSET(listen_socket[i].udp, readset))
+ handle_incoming_vpn_data(i);
+
+ if(FD_ISSET(listen_socket[i].tcp, readset))
+ handle_new_meta_connection(listen_socket[i].tcp);
+ }
}
/*
this is where it all happens...
*/
-void main_loop(void)
-{
- fd_set fset;
- struct timeval tv;
- int r;
- time_t last_ping_check;
-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)
- {
- sighup = 0;
-/* FIXME: reprogram this.
- if(debug_lvl > 1)
- syslog(LOG_INFO, _("Rereading configuration file"));
- close_network_connections();
- clear_config();
- if(read_config_file(&config, configfilename))
- {
- syslog(LOG_ERR, _("Unable to reread configuration file, exiting"));
- exit(0);
- }
- sleep(5);
- setup_network_connections();
-*/
- continue;
- }
-
- if(last_ping_check + timeout < time(NULL))
- /* Let's check if everybody is still alive */
- {
- check_dead_connections();
- last_ping_check = time(NULL);
+int main_loop(void) {
+ fd_set readset, writeset;
+#ifdef HAVE_PSELECT
+ struct timespec tv;
+ sigset_t omask, block_mask;
+ time_t next_event;
+#else
+ struct timeval tv;
+#endif
+ int r, maxfd;
+ time_t last_ping_check, last_config_check, last_graph_dump;
+ event_t *event;
+
+ last_ping_check = now;
+ last_config_check = now;
+ last_graph_dump = now;
+
+ srand(now);
+
+#ifdef HAVE_PSELECT
+ if(lookup_config(config_tree, "GraphDumpFile"))
+ graph_dump = true;
+ /* Block SIGHUP & SIGALRM */
+ sigemptyset(&block_mask);
+ sigaddset(&block_mask, SIGHUP);
+ sigaddset(&block_mask, SIGALRM);
+ sigprocmask(SIG_BLOCK, &block_mask, &omask);
+#endif
+
+ running = true;
+
+ while(running) {
+#ifdef HAVE_PSELECT
+ next_event = last_ping_check + pingtimeout;
+ if(graph_dump && next_event > last_graph_dump + 60)
+ next_event = last_graph_dump + 60;
+
+ if((event = peek_next_event()) && next_event > event->time)
+ next_event = event->time;
+
+ if(next_event <= now)
+ tv.tv_sec = 0;
+ else
+ tv.tv_sec = next_event - now;
+ tv.tv_nsec = 0;
+#else
+ tv.tv_sec = 1;
+ tv.tv_usec = 0;
+#endif
+
+ maxfd = build_fdset(&readset, &writeset);
+
+#ifdef HAVE_MINGW
+ LeaveCriticalSection(&mutex);
+#endif
+#ifdef HAVE_PSELECT
+ r = pselect(maxfd + 1, &readset, &writeset, NULL, &tv, &omask);
+#else
+ r = select(maxfd + 1, &readset, &writeset, NULL, &tv);
+#endif
+ now = time(NULL);
+#ifdef HAVE_MINGW
+ EnterCriticalSection(&mutex);
+#endif
+
+ if(r < 0) {
+ if(!sockwouldblock(sockerrno)) {
+ logger(LOG_ERR, "Error while waiting for input: %s", sockstrerror(sockerrno));
+ dump_connections();
+ return 1;
+ }
+ }
+
+ if(r > 0)
+ check_network_activity(&readset, &writeset);
+
+ if(do_purge) {
+ purge();
+ do_purge = false;
+ }
+
+ /* Let's check if everybody is still alive */
+
+ if(last_ping_check + pingtimeout <= now) {
+ check_dead_connections();
+ last_ping_check = now;
+
+ if(routing_mode == RMODE_SWITCH)
+ age_subnets();
+
+ age_past_requests();
+
+ /* Should we regenerate our key? */
+
+ if(keyexpires <= now) {
+ avl_node_t *node;
+ node_t *n;
+
+ ifdebug(STATUS) logger(LOG_INFO, "Expiring symmetric keys");
+
+ for(node = node_tree->head; node; node = node->next) {
+ n = node->data;
+ if(n->inkey) {
+ free(n->inkey);
+ n->inkey = NULL;
+ }
+ }
+
+ send_key_changed();
+ keyexpires = now + keylifetime;
+ }
+
+ /* Detect ADD_EDGE/DEL_EDGE storms that are caused when
+ * two tinc daemons with the same name are on the VPN.
+ * If so, sleep a while. If this happens multiple times
+ * in a row, sleep longer. */
+
+ if(contradicting_del_edge > 100 && contradicting_add_edge > 100) {
+ logger(LOG_WARNING, "Possible node with same Name as us! Sleeping %d seconds.", sleeptime);
+ usleep(sleeptime * 1000000LL);
+ sleeptime *= 2;
+ if(sleeptime < 0)
+ sleeptime = 3600;
+ } else {
+ sleeptime /= 2;
+ if(sleeptime < 10)
+ sleeptime = 10;
+ }
+
+ contradicting_add_edge = 0;
+ contradicting_del_edge = 0;
+ }
+
+ if(sigalrm) {
+ avl_node_t *node;
+ logger(LOG_INFO, "Flushing event queue");
+ expire_events();
+ for(node = connection_tree->head; node; node = node->next) {
+ connection_t *c = node->data;
+ send_ping(c);
+ }
+ sigalrm = false;
+ }
+
+ while((event = get_expired_event())) {
+ event->handler(event->data);
+ free_event(event);
+ }
+
+ if(sighup) {
+ connection_t *c;
+ avl_node_t *node, *next;
+ char *fname;
+ struct stat s;
+
+ sighup = false;
+
+ reopenlogger();
+
+ /* Reread our own configuration file */
+
+ exit_configuration(&config_tree);
+ init_configuration(&config_tree);
+
+ if(!read_server_config()) {
+ logger(LOG_ERR, "Unable to reread configuration file, exitting.");
+ return 1;
+ }
+
+ /* Cancel non-active outgoing connections */
+
+ for(node = connection_tree->head; node; node = next) {
+ next = node->next;
+ c = node->data;
+
+ c->outgoing = NULL;
+
+ if(c->status.connecting) {
+ terminate_connection(c, false);
+ connection_del(c);
+ }
+ }
+
+ /* Wipe list of outgoing connections */
+
+ for(list_node_t *node = outgoing_list->head; node; node = node->next) {
+ outgoing_t *outgoing = node->data;
+
+ if(outgoing->event)
+ event_del(outgoing->event);
+ }
+
+ list_delete_list(outgoing_list);
+
+ /* Close connections to hosts that have a changed or deleted host config file */
+
+ for(node = connection_tree->head; node; node = node->next) {
+ c = node->data;
+
+ xasprintf(&fname, "%s/hosts/%s", confbase, c->name);
+ if(stat(fname, &s) || s.st_mtime > last_config_check)
+ terminate_connection(c, c->status.active);
+ free(fname);
+ }
+
+ last_config_check = now;
+
+ /* If StrictSubnet is set, expire deleted Subnets and read new ones in */
+
+ if(strictsubnets) {
+ subnet_t *subnet;
+
+ for(node = subnet_tree->head; node; node = node->next) {
+ subnet = node->data;
+ subnet->expires = 1;
+ }
+
+ load_all_subnets();
+
+ for(node = subnet_tree->head; node; node = next) {
+ next = node->next;
+ subnet = node->data;
+ if(subnet->expires == 1) {
+ send_del_subnet(everyone, subnet);
+ if(subnet->owner->status.reachable)
+ subnet_update(subnet->owner, subnet, false);
+ subnet_del(subnet->owner, subnet);
+ } else if(subnet->expires == -1) {
+ subnet->expires = 0;
+ } else {
+ send_add_subnet(everyone, subnet);
+ if(subnet->owner->status.reachable)
+ subnet_update(subnet->owner, subnet, true);
+ }
+ }
+ }
+
+ /* Try to make outgoing connections */
+
+ try_outgoing_connections();
+ }
+
+ /* Dump graph if wanted every 60 seconds*/
+
+ if(last_graph_dump + 60 <= now) {
+ dump_graph();
+ last_graph_dump = now;
+ }
}
- if(r > 0)
- {
- check_network_activity(&fset);
+#ifdef HAVE_PSELECT
+ /* Restore SIGHUP & SIGALARM mask */
+ sigprocmask(SIG_SETMASK, &omask, NULL);
+#endif
- /* local tap data */
- if(FD_ISSET(tap_fd, &fset))
- handle_tap_input();
- }
- }
-cp
+ return 0;
}