/*
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) 1998-2002 Ivo Timmermans <ivo@o2w.nl>,
+ 2000-2002 Guus Sliepen <guus@sliepen.eu.org>
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
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- $Id: net.c,v 1.35.4.62 2000/11/04 14:16:46 zarq Exp $
+ $Id: net.c,v 1.35.4.179 2002/09/09 19:39:58 guus Exp $
*/
#include "config.h"
-#include <arpa/inet.h>
#include <errno.h>
#include <fcntl.h>
-#include <linux/sockios.h>
-#include <net/if.h>
#include <netdb.h>
#include <netinet/in.h>
+#ifdef HAVE_NETINET_IN_SYSTM_H
+ #include <netinet/in_systm.h>
+#endif
+#ifdef HAVE_NETINET_IP_H
+ #include <netinet/ip.h>
+#endif
+#ifdef HAVE_NETINET_TCP_H
+ #include <netinet/tcp.h>
+#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
-#include <sys/signal.h>
-#include <sys/socket.h>
+#include <signal.h>
#include <sys/time.h>
#include <sys/types.h>
#include <syslog.h>
#include <unistd.h>
#include <sys/ioctl.h>
-#include <openssl/rand.h>
-#include <openssl/evp.h>
-#include <openssl/err.h>
+/* SunOS really wants sys/socket.h BEFORE net/if.h,
+ and FreeBSD wants these lines below the rest. */
+#include <arpa/inet.h>
+#include <sys/socket.h>
+#include <net/if.h>
-#ifdef HAVE_TUNTAP
-#include LINUX_IF_TUN_H
-#endif
+#include <openssl/rand.h>
#include <utils.h>
#include <xalloc.h>
+#include <avl_tree.h>
+#include <list.h>
#include "conf.h"
-#include "connlist.h"
+#include "connection.h"
#include "meta.h"
#include "net.h"
#include "netutl.h"
+#include "process.h"
#include "protocol.h"
#include "subnet.h"
+#include "graph.h"
+#include "process.h"
+#include "route.h"
+#include "device.h"
+#include "event.h"
#include "system.h"
-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;
-
-config_t *upstreamcfg;
-static int seconds_till_retry;
-
-int keylifetime = 0;
-int keyexpires = 0;
-
-char *unknown = NULL;
-char *interface_name = NULL; /* Contains the name of the interface */
-
-subnet_t mymac;
-
-/*
- Execute the given script.
- This function doesn't really belong here.
-*/
-int execute_script(const char* name)
-{
- char *scriptname;
- pid_t pid;
- char *s;
-
- asprintf(&scriptname, "%s/%s", confbase, name);
-
- if((pid = fork()) < 0)
- {
- syslog(LOG_ERR, _("System call `%s' failed: %m"),
- "fork");
- return -1;
- }
-
- if(pid)
- {
- free(scriptname);
- return 0;
- }
-
- /* Child here */
-
- asprintf(&s, "IFNAME=%s", interface_name);
- putenv(s);
- 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);
-}
-
-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;
-
- cl->want_ping = 1;
-
- 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;
-}
-
-int xrecv(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;
-}
-
-/*
- 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
-}
-
-/* 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
-}
+#ifndef HAVE_RAND_PSEUDO_BYTES
+#define RAND_pseudo_bytes RAND_bytes
+#endif
-/*
- 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;
+int do_purge = 0;
+int sighup = 0;
+int sigalrm = 0;
- if(!function(cl, p->packet))
- del_queue(pq, p);
-
- p = next;
- }
+time_t now = 0;
- if(debug_lvl >= DEBUG_TRAFFIC)
- syslog(LOG_DEBUG, _("Queue flushed"));
-cp
-}
+/* Purge edges and subnets of unreachable nodes. Use carefully. */
-/*
- 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)
+void purge(void)
{
-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);
- }
+ avl_node_t *nnode, *nnext, *enode, *enext, *snode, *snext;
+ node_t *n;
+ edge_t *e;
+ subnet_t *s;
+ cp();
+ if(debug_lvl >= DEBUG_PROTOCOL)
+ syslog(LOG_DEBUG, _("Purging unreachable nodes"));
- 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
-}
+ for(nnode = node_tree->head; nnode; nnode = nnext)
+ {
+ nnext = nnode->next;
+ n = (node_t *)nnode->data;
-/*
- 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(!n->status.reachable)
{
- 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 we ourselves have indirectdata flag set, we should send only to our uplink! */
+ if(debug_lvl >= DEBUG_SCARY_THINGS)
+ syslog(LOG_DEBUG, _("Purging node %s (%s)"), n->name, n->hostname);
- /* FIXME - check for indirection and reprogram it The Right Way(tm) this time. */
-
- if(!cl->status.dataopen)
- if(setup_vpn_connection(cl) < 0)
+ for(snode = n->subnet_tree->head; snode; snode = snext)
{
- syslog(LOG_ERR, _("Could not open UDP connection to %s (%s)"),
- cl->name, cl->hostname);
- return -1;
+ snext = snode->next;
+ s = (subnet_t *)snode->data;
+ send_del_subnet(broadcast, s);
+ subnet_del(n, s);
}
-
- 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? */
- }
-
- /* can we send it? can we? can we? huh? */
-cp
- return xsend(cl, packet);
-}
-
-/*
- 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, 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
-
- /* Add name of network interface to environment (for scripts) */
-
- ioctl(tap_fd, SIOCGIFNAME, (void *) &ifr);
- interface_name = xmalloc(strlen(ifr.ifr_name));
- strcpy(interface_name, ifr.ifr_name);
-
-cp
- return 0;
-}
-
-/*
- 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, _("System call `%s' failed: %m"),
- "setsockopt");
- return -1;
- }
-
- if(setsockopt(nfd, SOL_SOCKET, SO_KEEPALIVE, &one, sizeof(one)))
- {
- 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)
- {
- syslog(LOG_ERR, _("System call `%s' failed: %m"),
- "fcntl");
- 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->address);
- 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, _("System call `%s' failed: %m"),
- "listen");
- return -1;
- }
-cp
- return nfd;
-}
-
-/*
- 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, _("System call `%s' failed: %m"),
- "setsockopt");
- return -1;
- }
-
- flags = fcntl(nfd, F_GETFL);
- if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0)
- {
- 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)))
- {
- syslog(LOG_ERR, _("Can't bind to port %hd/udp: %m"), port);
- return -1;
- }
-cp
- return nfd;
-}
-
-/*
- 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, 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 >= DEBUG_CONNECTIONS)
- syslog(LOG_INFO, _("Connected to %s port %hd"),
- cl->hostname, cl->port);
-
- cl->status.meta = 1;
-cp
- return 0;
-}
-
-/*
- 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, 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);
- ncn->want_ping = 0;
-
- conn_list_add(ncn);
-
- send_id(ncn);
-cp
- return 0;
-}
-
-/*
- Configure conn_list_t myself and set up the local sockets (listen only)
-*/
-int setup_myself(void)
-{
- config_t const *cfg;
- 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, tincname))) /* 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, 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, 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, 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;
-
-/* Read in all the subnets specified in the host configuration file */
-
- for(cfg = myself->config; (cfg = get_config_val(cfg, subnet)); cfg = 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;
- }
-
- 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;
- }
-
- /* 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, 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);
-cp
- return 0;
-}
-
-RETSIGTYPE
-sigalrm_handler(int a)
-{
- config_t const *cfg;
-cp
- cfg = get_config_val(upstreamcfg, 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, 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
-}
-
-/*
- 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;
-
- /* Run tinc-up script to further initialize the tap interface */
- execute_script("tinc-up");
-
- if(!(cfg = get_config_val(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, 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;
-}
-
-/*
- 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)
+ for(enode = n->edge_tree->head; enode; enode = enext)
{
- close(myself->meta_socket);
- close(myself->socket);
- free_conn_list(myself);
- myself = NULL;
+ enext = enode->next;
+ e = (edge_t *)enode->data;
+ send_del_edge(broadcast, e);
+ edge_del(e);
}
- 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;
-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;
- }
-
- 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;
-}
-
-/*
- 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, _("System call `%s' failed: %m"),
- "getpeername");
- return NULL;
+ node_del(n);
}
-
- 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);
- p->want_ping = 0;
-
- 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;
+ }
+ cp();
}
/*
put all file descriptors in an fd_set array
+ While we're at it, purge stuff that needs to be removed.
*/
void build_fdset(fd_set *fs)
{
- conn_list_t *p;
-cp
+ avl_node_t *node, *next;
+ connection_t *c;
+ int i;
+ cp();
FD_ZERO(fs);
- for(p = conn_list; p != NULL; p = p->next)
+ for(node = connection_tree->head; node; node = 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
-}
+ next = node->next;
+ c = (connection_t *)node->data;
-/*
- 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 x, l = sizeof(x);
- struct sockaddr from;
- int lenin;
- socklen_t fromlen = sizeof(from);
-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(c->status.remove)
+ {
+ connection_del(c);
+ if(!connection_tree->head)
+ purge();
+ }
+ else
+ FD_SET(c->socket, fs);
}
- if((lenin = recvfrom(myself->socket, (char *) &(pkt.len), MTU, 0, &from, &fromlen)) <= 0)
+ for(i = 0; i < listen_sockets; i++)
{
- syslog(LOG_ERR, _("Receiving packet failed: %m"));
- return -1;
+ FD_SET(listen_socket[i].tcp, fs);
+ FD_SET(listen_socket[i].udp, fs);
}
- if(debug_lvl >= DEBUG_TRAFFIC)
- {
- syslog(LOG_DEBUG, _("Received packet of %d bytes"), lenin);
- }
-
-cp
- return xrecv(&pkt);
+ FD_SET(device_fd, fs);
+ cp();
}
/*
- terminate a connection and notify the other
- end before closing the sockets
+ Terminate a connection:
+ - Close the socket
+ - Remove associated edge and tell other connections about it if report = 1
+ - Check if we need to retry making an outgoing connection
+ - Deactivate the host
*/
-void terminate_connection(conn_list_t *cl)
+void terminate_connection(connection_t *c, int report)
{
- conn_list_t *p;
- subnet_t *s;
-cp
- if(cl->status.remove)
+ cp();
+ if(c->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);
+ c->name, c->hostname);
-cp
- /* Find all connections that were lost because they were behind cl
- (the connection that was dropped). */
+ c->status.remove = 1;
+ c->status.active = 0;
- 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 :) */
+ if(c->node)
+ c->node->connection = NULL;
- /* Inform others of termination if it was still active */
+ if(c->socket)
+ close(c->socket);
- 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);
+ if(c->edge)
+ {
+ if(report)
+ send_del_edge(broadcast, c->edge);
- /* Remove the associated subnets */
+ edge_del(c->edge);
- for(s = cl->subnets; s; s = s->next)
- subnet_del(s);
+ /* Run MST and SSSP algorithms */
- /* 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"));
+ graph();
}
- /* Inactivate */
+ /* Check if this was our outgoing connection */
- cl->status.active = 0;
-cp
+ if(c->outgoing)
+ {
+ retry_outgoing(c->outgoing);
+ c->outgoing = NULL;
+ }
+ cp();
}
/*
end does not reply in time, we consider them dead
and close the connection.
*/
-int check_dead_connections(void)
+void 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)
+ avl_node_t *node, *next;
+ connection_t *c;
+ cp();
+ for(node = connection_tree->head; node; node = next)
+ {
+ next = node->next;
+ c = (connection_t *)node->data;
+ if(c->last_ping_time + pingtimeout < now)
+ {
+ if(c->status.active)
{
- if(p->status.pinged && !p->status.got_pong)
+ if(c->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);
+ syslog(LOG_INFO, _("%s (%s) didn't respond to PING"),
+ c->name, c->hostname);
+ c->status.timeout = 1;
+ terminate_connection(c, 1);
}
- else if(p->want_ping)
+ else
{
- send_ping(p);
- p->last_ping_time = now;
- p->status.pinged = 1;
- p->status.got_pong = 0;
+ send_ping(c);
}
}
- }
- }
-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;
+ else
+ {
+ if(c->status.remove)
+ {
+ syslog(LOG_WARNING, _("Old connection_t for %s (%s) status %04x still lingering, deleting..."), c->name, c->hostname, c->status);
+ connection_del(c);
+ continue;
+ }
+ if(debug_lvl >= DEBUG_CONNECTIONS)
+ syslog(LOG_WARNING, _("Timeout from %s (%s) during authentication"),
+ c->name, c->hostname);
+ terminate_connection(c, 0);
+ }
+ }
}
-
- conn_list_add(ncn);
-cp
- return 0;
+ cp();
}
/*
*/
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)
+ connection_t *c;
+ avl_node_t *node;
+ int result, i;
+ int len = sizeof(result);
+ vpn_packet_t packet;
+ cp();
+ if(FD_ISSET(device_fd, f))
{
- 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(!read_packet(&packet))
+ route_outgoing(&packet);
}
-
- if(FD_ISSET(myself->socket, f))
- handle_incoming_vpn_data();
-
- if(FD_ISSET(myself->meta_socket, f))
- handle_new_meta_connection();
-cp
-}
-/*
- 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)
+ for(node = connection_tree->head; node; node = node->next)
{
- 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;
- }
+ c = (connection_t *)node->data;
- total_tap_in += lenin;
+ if(c->status.remove)
+ continue;
- if(lenin < 32)
- {
- if(debug_lvl >= DEBUG_TRAFFIC)
- syslog(LOG_WARNING, _("Received short packet from tap device"));
- return;
+ if(FD_ISSET(c->socket, f))
+ {
+ if(c->status.connecting)
+ {
+ c->status.connecting = 0;
+ getsockopt(c->socket, SOL_SOCKET, SO_ERROR, &result, &len);
+ if(!result)
+ finish_connecting(c);
+ else
+ {
+ if(debug_lvl >= DEBUG_CONNECTIONS)
+ syslog(LOG_DEBUG, _("Error while connecting to %s (%s): %s"), c->name, c->hostname, strerror(result));
+ close(c->socket);
+ do_outgoing_connection(c);
+ continue;
+ }
+ }
+ if(receive_meta(c) < 0)
+ {
+ terminate_connection(c, c->status.active);
+ continue;
+ }
+ }
}
- if(debug_lvl >= DEBUG_TRAFFIC)
+ for(i = 0; i < listen_sockets; i++)
{
- syslog(LOG_DEBUG, _("Read packet of length %d from tap device"), vp.len);
+ if(FD_ISSET(listen_socket[i].udp, f))
+ handle_incoming_vpn_data(listen_socket[i].udp);
+ if(FD_ISSET(listen_socket[i].tcp, f))
+ handle_new_meta_connection(listen_socket[i].tcp);
}
-
- send_packet(ntohl(*((unsigned long*)(&vp.data[30]))), &vp);
-cp
+ cp();
}
/*
struct timeval tv;
int r;
time_t last_ping_check;
- int t;
-cp
- last_ping_check = time(NULL);
+ event_t *event;
+ cp();
+ last_ping_check = now;
+
+ srand(now);
for(;;)
{
- tv.tv_sec = timeout;
+ now = time(NULL);
+
+ tv.tv_sec = 1 + (rand() & 7); /* Approx. 5 seconds, randomized to prevent global synchronisation effects */
tv.tv_usec = 0;
- prune_conn_list();
build_fdset(&fset);
- if((r = select(FD_SETSIZE, &fset, NULL, NULL, &tv)) < 0)
+ r = select(FD_SETSIZE, &fset, NULL, NULL, &tv);
+
+ if(r < 0)
{
- if(errno != EINTR) /* because of alarm */
+ if(errno != EINTR && errno != EAGAIN)
{
- syslog(LOG_ERR, _("Error while waiting for input: %m"));
+ syslog(LOG_ERR, _("Error while waiting for input: %s"), strerror(errno));
+ cp_trace();
+ dump_connections();
return;
}
- }
- if(sighup)
- {
- syslog(LOG_INFO, _("Rereading configuration file and restarting in 5 seconds"));
- sighup = 0;
- close_network_connections();
- clear_config(&config);
+ continue;
+ }
- if(read_server_config())
- {
- syslog(LOG_ERR, _("Unable to reread configuration file, exiting"));
- exit(0);
- }
+ check_network_activity(&fset);
- sleep(5);
-
- if(setup_network_connections())
- return;
-
- continue;
+ if(do_purge)
+ {
+ purge();
+ do_purge = 0;
}
- 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);
+ if(last_ping_check + pingtimeout < now)
+ {
+ check_dead_connections();
+ last_ping_check = now;
+
+ if(routing_mode== RMODE_SWITCH)
+ age_mac();
+
+ age_past_requests();
/* Should we regenerate our key? */
- if(keyexpires < t)
+ if(keyexpires < now)
{
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;
+
+ RAND_pseudo_bytes(myself->key, myself->keylength);
+ send_key_changed(broadcast, myself);
+ keyexpires = now + keylifetime;
}
- }
+ }
+
- if(r > 0)
+ while((event = get_expired_event()))
{
- check_network_activity(&fset);
+ event->handler(event->data);
+ free(event);
+ }
- /* local tap data */
- if(FD_ISSET(tap_fd, &fset))
- handle_tap_input();
+ if(sigalrm)
+ {
+ syslog(LOG_INFO, _("Flushing event queue"));
+
+ while(event_tree->head)
+ {
+ event = (event_t *)event_tree->head->data;
+ event->handler(event->data);
+ event_del(event);
+ }
+ sigalrm = 0;
+ }
+
+ if(sighup)
+ {
+ sighup = 0;
+ close_network_connections();
+ exit_configuration(&config_tree);
+
+ syslog(LOG_INFO, _("Rereading configuration file and restarting in 5 seconds..."));
+ sleep(5);
+
+ init_configuration(&config_tree);
+
+ if(read_server_config())
+ {
+ syslog(LOG_ERR, _("Unable to reread configuration file, exitting."));
+ exit(1);
+ }
+
+ if(setup_network_connections())
+ return;
+
+ continue;
}
}
-cp
+ cp();
}