/*
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 <itimmermans@bigfoot.com>,
+ 2000-2002 Guus Sliepen <guus@sliepen.warande.net>
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 1.35.4.64 2000/11/04 15:32:05 zarq Exp $
+ $Id: net.c,v 1.35.4.153 2002/02/11 14:20:21 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_LINUX
+ #include <netinet/ip.h>
+ #include <netinet/tcp.h>
+#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
+#include <signal.h>
#include <sys/signal.h>
-#include <sys/socket.h>
#include <sys/time.h>
#include <sys/types.h>
#include <syslog.h>
#include <unistd.h>
#include <sys/ioctl.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>
+
#include <openssl/rand.h>
#include <openssl/evp.h>
-#include <openssl/err.h>
+#include <openssl/pem.h>
+#include <openssl/hmac.h>
-#ifdef HAVE_TUNTAP
-#include LINUX_IF_TUN_H
+#ifndef HAVE_RAND_PSEUDO_BYTES
+#define RAND_pseudo_bytes RAND_bytes
#endif
#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;
+int maxtimeout = 900;
+int seconds_till_retry = 5;
-config_t *upstreamcfg;
-static int seconds_till_retry;
+int tcp_socket = -1;
+int udp_socket = -1;
int keylifetime = 0;
int keyexpires = 0;
-char *unknown = NULL;
-char *interface_name = NULL; /* Contains the name of the interface */
+int do_prune = 0;
+int do_purge = 0;
+int sighup = 0;
+int sigalrm = 0;
-subnet_t mymac;
+#define MAX_SEQNO 1073741824
-/*
- Execute the given script.
- This function doesn't really belong here.
-*/
-int execute_script(const char* name)
-{
- char *scriptname;
- pid_t pid;
- char *s;
+/* VPN packet I/O */
- if((pid = fork()) < 0)
- {
- syslog(LOG_ERR, _("System call `%s' failed: %m"),
- "fork");
- return -1;
- }
+void receive_udppacket(node_t *n, vpn_packet_t *inpkt)
+{
+ vpn_packet_t outpkt;
+ int outlen, outpad;
+ EVP_CIPHER_CTX ctx;
+ char hmac[EVP_MAX_MD_SIZE];
+cp
- if(pid)
+ if(myself->digest && myself->maclength)
{
- return 0;
+ inpkt->len -= myself->maclength;
+ HMAC(myself->digest, myself->key, myself->keylength, (char *)&inpkt->seqno, inpkt->len, hmac, NULL);
+ if(memcmp(hmac, (char *)&inpkt->seqno + inpkt->len, myself->maclength))
+ {
+ syslog(LOG_DEBUG, _("Got unauthenticated packet from %s (%s)"), n->name, n->hostname);
+ return;
+ }
}
- /* Child here */
-
- asprintf(&scriptname, "%s/%s", confbase, name);
- asprintf(&s, "IFNAME=%s", interface_name);
- putenv(s);
- free(s);
+ /* Decrypt the packet */
- if(netname)
- {
- asprintf(&s, "NETNAME=%s", netname);
- putenv(s);
- free(s);
- }
+ if(myself->cipher)
+ {
+ EVP_DecryptInit(&ctx, myself->cipher, myself->key, myself->key + myself->cipher->key_len);
+ EVP_DecryptUpdate(&ctx, (char *)&outpkt.seqno, &outlen, (char *)&inpkt->seqno, inpkt->len);
+ EVP_DecryptFinal(&ctx, (char *)&outpkt.seqno + outlen, &outpad);
+ outlen += outpad;
+ outpkt.len = outlen - sizeof(outpkt.seqno);
+ }
else
- {
- unsetenv("NETNAME");
- }
+ {
+ memcpy((char *)&outpkt.seqno, (char *)&inpkt->seqno, inpkt->len);
+ outpkt.len = inpkt->len - sizeof(outpkt.seqno);
+ }
- if(chdir(confbase) < 0)
- {
- syslog(LOG_ERR, _("Couldn't chdir to `%s': %m"),
- confbase);
- }
-
- execl(scriptname, NULL);
- /* No return on success */
+ if (ntohl(outpkt.seqno) <= n->received_seqno)
+ {
+ syslog(LOG_DEBUG, _("Got late or replayed packet from %s (%s), seqno %d"), n->name, n->hostname, ntohl(*(unsigned int *)&outpkt.seqno));
+ return;
+ }
- if(errno != ENOENT) /* Ignore if the file does not exist */
- syslog(LOG_WARNING, _("Error executing `%s': %m"), scriptname);
+ n->received_seqno = ntohl(outpkt.seqno);
+
+ if(n->received_seqno > MAX_SEQNO)
+ keyexpires = 0;
- /* No need to free things */
- exit(0);
+ receive_packet(n, &outpkt);
+cp
}
-int xsend(conn_list_t *cl, vpn_packet_t *inpkt)
+void receive_tcppacket(connection_t *c, char *buffer, int len)
{
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;
+ outpkt.len = len;
+ memcpy(outpkt.data, buffer, len);
-/* 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;
- }
+ receive_packet(c->node, &outpkt);
cp
- return 0;
}
-int xrecv(vpn_packet_t *inpkt)
+void receive_packet(node_t *n, vpn_packet_t *packet)
{
- 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);
+ syslog(LOG_DEBUG, _("Received packet of %d bytes from %s (%s)"), packet->len, n->name, n->hostname);
- 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;
- }
+ route_incoming(n, packet);
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)
+void send_udppacket(node_t *n, vpn_packet_t *inpkt)
{
- queue_element_t *e;
+ vpn_packet_t outpkt;
+ int outlen, outpad;
+ EVP_CIPHER_CTX ctx;
+ struct sockaddr_in to;
+ socklen_t tolen = sizeof(to);
+ vpn_packet_t *copy;
cp
- e = xmalloc(sizeof(*e));
- e->packet = xmalloc(s);
- memcpy(e->packet, packet, s);
-
- if(!*q)
+ if(!n->status.validkey)
{
- *q = xmalloc(sizeof(**q));
- (*q)->head = (*q)->tail = NULL;
- }
+ if(debug_lvl >= DEBUG_TRAFFIC)
+ syslog(LOG_INFO, _("No valid key known yet for %s (%s), queueing packet"),
+ n->name, n->hostname);
- e->next = NULL; /* We insert at the tail */
+ /* Since packet is on the stack of handle_tap_input(),
+ we have to make a copy of it first. */
- 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;
- }
+ copy = xmalloc(sizeof(vpn_packet_t));
+ memcpy(copy, inpkt, sizeof(vpn_packet_t));
- (*q)->tail = e;
-cp
-}
-
-/* Remove a queue element */
-void del_queue(packet_queue_t **q, queue_element_t *e)
-{
-cp
- free(e->packet);
+ list_insert_tail(n->queue, copy);
- 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;
- }
+ if(!n->status.waitingforkey)
+ send_req_key(n->nexthop->connection, myself, n);
+ return;
}
-
- free(e);
-cp
-}
-/*
- 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;
+ /* Encrypt the packet. */
- if(!function(cl, p->packet))
- del_queue(pq, p);
-
- p = next;
- }
+ inpkt->seqno = htonl(++(n->sent_seqno));
- if(debug_lvl >= DEBUG_TRAFFIC)
- syslog(LOG_DEBUG, _("Queue flushed"));
-cp
-}
+ if(n->cipher)
+ {
+ EVP_EncryptInit(&ctx, n->cipher, n->key, n->key + n->cipher->key_len);
+ EVP_EncryptUpdate(&ctx, (char *)&outpkt.seqno, &outlen, (char *)&inpkt->seqno, inpkt->len + sizeof(inpkt->seqno));
+ EVP_EncryptFinal(&ctx, (char *)&outpkt.seqno + outlen, &outpad);
+ outlen += outpad;
+ }
+ else
+ {
+ memcpy((char *)&outpkt.seqno, (char *)&inpkt->seqno, inpkt->len + sizeof(inpkt->seqno));
+ outlen = inpkt->len + sizeof(inpkt->seqno);
+ }
-/*
- 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(n->digest && n->maclength)
{
- if(debug_lvl >= DEBUG_TRAFFIC)
- syslog(LOG_DEBUG, _("Flushing send queue for %s (%s)"),
- cl->name, cl->hostname);
- flush_queue(cl, &(cl->sq), xsend);
+ HMAC(n->digest, n->key, n->keylength, (char *)&outpkt.seqno, outlen, (char *)&outpkt.seqno + outlen, &outpad);
+ outlen += n->maclength;
}
- if(cl->rq)
+ to.sin_family = AF_INET;
+ to.sin_addr.s_addr = htonl(n->address);
+ to.sin_port = htons(n->port);
+
+ if((sendto(udp_socket, (char *)&outpkt.seqno, outlen, 0, (const struct sockaddr *)&to, tolen)) < 0)
{
- if(debug_lvl >= DEBUG_TRAFFIC)
- syslog(LOG_DEBUG, _("Flushing receive queue for %s (%s)"),
- cl->name, cl->hostname);
- flush_queue(cl, &(cl->rq), xrecv);
+ syslog(LOG_ERR, _("Error sending packet to %s (%s): %m"),
+ n->name, n->hostname);
+ return;
}
cp
}
/*
send a packet to the given vpn ip.
*/
-int send_packet(ip_t to, vpn_packet_t *packet)
+void send_packet(node_t *n, vpn_packet_t *packet)
{
- conn_list_t *cl;
- subnet_t *subnet;
+ node_t *via;
cp
- if((subnet = lookup_subnet_ipv4(to)) == NULL)
+ if(debug_lvl >= DEBUG_TRAFFIC)
+ syslog(LOG_ERR, _("Sending packet of %d bytes to %s (%s)"),
+ packet->len, n->name, n->hostname);
+
+ if(n == myself)
{
if(debug_lvl >= DEBUG_TRAFFIC)
{
- syslog(LOG_NOTICE, _("Trying to look up %d.%d.%d.%d in connection list failed!"),
- IP_ADDR_V(to));
+ syslog(LOG_NOTICE, _("Packet is looping back to us!"));
}
- return -1;
- }
-
- cl = subnet->owner;
-
- /* 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)
+ return;
+ }
+
+ if(!n->status.reachable)
{
-/* 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;
+ syslog(LOG_INFO, _("Node %s (%s) is not reachable"),
+ n->name, n->hostname);
+ return;
}
- if(!cl->status.active)
+ via = (n->via == myself)?n->nexthop:n->via;
+
+ if(via != n && debug_lvl >= DEBUG_TRAFFIC)
+ syslog(LOG_ERR, _("Sending packet to %s via %s (%s)"),
+ n->name, via->name, n->via->hostname);
+
+ if((myself->options | via->options) & OPTION_TCPONLY)
{
-/* FIXME: Don't queue until everything else is fixed.
- if(debug_lvl >= DEBUG_TRAFFIC)
- syslog(LOG_INFO, _("%s (%s) is not ready, queueing packet"),
- cl->name, cl->hostname);
- add_queue(&(cl->sq), packet, packet->len + 2);
-*/
- return 0; /* We don't want to mess up, do we? */
+ if(send_tcppacket(via->connection, packet))
+ terminate_connection(via->connection, 1);
}
-
- /* can we send it? can we? can we? huh? */
-cp
- return xsend(cl, packet);
+ else
+ send_udppacket(via, packet);
}
-/*
- open the local ethertap device
-*/
-int setup_tap_fd(void)
+/* Broadcast a packet using the minimum spanning tree */
+
+void broadcast_packet(node_t *from, vpn_packet_t *packet)
{
- 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
+ avl_node_t *node;
+ connection_t *c;
cp
- if((nfd = open(tapfname, O_RDWR | O_NONBLOCK)) < 0)
+ if(debug_lvl >= DEBUG_TRAFFIC)
+ syslog(LOG_INFO, _("Broadcasting packet of %d bytes from %s (%s)"),
+ packet->len, from->name, from->hostname);
+
+ for(node = connection_tree->head; node; node = node->next)
{
- syslog(LOG_ERR, _("Could not open %s: %m"), tapfname);
- return -1;
+ c = (connection_t *)node->data;
+ if(c->status.active && c->status.mst && c != from->nexthop->connection)
+ send_packet(c->node, packet);
}
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);
+void flush_queue(node_t *n)
+{
+ list_node_t *node, *next;
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) */
+ if(debug_lvl >= DEBUG_TRAFFIC)
+ syslog(LOG_INFO, _("Flushing queue for %s (%s)"), n->name, n->hostname);
- ioctl(tap_fd, SIOCGIFNAME, (void *) &ifr);
- interface_name = xmalloc(strlen(ifr.ifr_name));
- strcpy(interface_name, ifr.ifr_name);
-
+ for(node = n->queue->head; node; node = next)
+ {
+ next = node->next;
+ send_udppacket(n, (vpn_packet_t *)node->data);
+ list_delete_node(n->queue, node);
+ }
cp
- return 0;
}
-/*
- set up the socket that we listen on for incoming
- (tcp) connections
-*/
-int setup_listen_meta_socket(int port)
+/* Setup sockets */
+
+int setup_listen_socket(port_t port)
{
int nfd, flags;
struct sockaddr_in a;
- const int one = 1;
- config_t const *cfg;
+ int option;
+ ipv4_t *address;
+#ifdef HAVE_LINUX
+ char *interface;
+#endif
cp
if((nfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
{
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)
{
+ close(nfd);
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;
- }
- }
+ /* Optimize TCP settings */
+
+ option = 1;
+ setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option));
+ setsockopt(nfd, SOL_SOCKET, SO_KEEPALIVE, &option, sizeof(option));
+#ifdef HAVE_LINUX
+ setsockopt(nfd, SOL_TCP, TCP_NODELAY, &option, sizeof(option));
+
+ option = IPTOS_LOWDELAY;
+ setsockopt(nfd, SOL_IP, IP_TOS, &option, sizeof(option));
+
+ if(get_config_string(lookup_config(config_tree, "BindToInterface"), &interface))
+ if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, interface, strlen(interface)))
+ {
+ close(nfd);
+ syslog(LOG_ERR, _("Can't bind to interface %s: %m"), interface);
+ return -1;
+ }
+#endif
memset(&a, 0, sizeof(a));
a.sin_family = AF_INET;
+ a.sin_addr.s_addr = htonl(INADDR_ANY);
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(get_config_address(lookup_config(config_tree, "BindToAddress"), &address))
+ {
+ a.sin_addr.s_addr = htonl(*address);
+ free(address);
+ }
if(bind(nfd, (struct sockaddr *)&a, sizeof(struct sockaddr)))
{
+ close(nfd);
syslog(LOG_ERR, _("Can't bind to port %hd/tcp: %m"), port);
return -1;
}
if(listen(nfd, 3))
{
+ close(nfd);
syslog(LOG_ERR, _("System call `%s' failed: %m"),
"listen");
return -1;
return nfd;
}
-/*
- setup the socket for incoming encrypted
- data (the udp part)
-*/
-int setup_vpn_in_socket(int port)
+int setup_vpn_in_socket(port_t port)
{
int nfd, flags;
struct sockaddr_in a;
cp
if((nfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
{
+ close(nfd);
syslog(LOG_ERR, _("Creating socket failed: %m"));
return -1;
}
- if(setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)))
- {
- syslog(LOG_ERR, _("System call `%s' failed: %m"),
- "setsockopt");
- return -1;
- }
+ setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
flags = fcntl(nfd, F_GETFL);
if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0)
{
+ close(nfd);
syslog(LOG_ERR, _("System call `%s' failed: %m"),
"fcntl");
return -1;
if(bind(nfd, (struct sockaddr *)&a, sizeof(struct sockaddr)))
{
+ close(nfd);
syslog(LOG_ERR, _("Can't bind to port %hd/udp: %m"), port);
return -1;
}
return nfd;
}
-/*
- setup an outgoing meta (tcp) socket
-*/
-int setup_outgoing_meta_socket(conn_list_t *cl)
+void retry_outgoing(outgoing_t *outgoing)
+{
+ event_t *event;
+cp
+ outgoing->timeout += 5;
+ if(outgoing->timeout > maxtimeout)
+ outgoing->timeout = maxtimeout;
+
+ event = new_event();
+ event->handler = (event_handler_t)setup_outgoing_connection;
+ event->time = time(NULL) + outgoing->timeout;
+ event->data = outgoing;
+ event_add(event);
+
+ if(debug_lvl >= DEBUG_CONNECTIONS)
+ syslog(LOG_NOTICE, _("Trying to re-establish outgoing connection in %d seconds"), outgoing->timeout);
+cp
+}
+
+int setup_outgoing_socket(connection_t *c)
{
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);
+ syslog(LOG_INFO, _("Trying to connect to %s (%s)"), c->name, c->hostname);
- if((cfg = get_config_val(cl->config, port)) == NULL)
- cl->port = 655;
- else
- cl->port = cfg->data.val;
+ c->socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
- cl->meta_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
- if(cl->meta_socket == -1)
+ if(c->socket == -1)
{
syslog(LOG_ERR, _("Creating socket for %s port %d failed: %m"),
- cl->hostname, cl->port);
+ c->hostname, c->port);
return -1;
}
+ /* Bind first to get a fix on our source port???
+
a.sin_family = AF_INET;
- a.sin_port = htons(cl->port);
- a.sin_addr.s_addr = htonl(cl->address);
+ a.sin_port = htons(0);
+ a.sin_addr.s_addr = htonl(INADDR_ANY);
- if(connect(cl->meta_socket, (struct sockaddr *)&a, sizeof(a)) == -1)
+ if(bind(c->socket, (struct sockaddr *)&a, sizeof(struct sockaddr)))
{
- syslog(LOG_ERR, _("%s port %hd: %m"), cl->hostname, cl->port);
+ close(c->socket);
+ syslog(LOG_ERR, _("System call `%s' failed: %m"), "bind");
return -1;
}
- flags = fcntl(cl->meta_socket, F_GETFL);
- if(fcntl(cl->meta_socket, F_SETFL, flags | O_NONBLOCK) < 0)
+ */
+
+ /* Optimize TCP settings?
+
+ option = 1;
+ setsockopt(c->socket, SOL_SOCKET, SO_KEEPALIVE, &option, sizeof(option));
+#ifdef HAVE_LINUX
+ setsockopt(c->socket, SOL_TCP, TCP_NODELAY, &option, sizeof(option));
+
+ option = IPTOS_LOWDELAY;
+ setsockopt(c->socket, SOL_IP, IP_TOS, &option, sizeof(option));
+#endif
+
+ */
+
+ /* Connect */
+
+ a.sin_family = AF_INET;
+ a.sin_port = htons(c->port);
+ a.sin_addr.s_addr = htonl(c->address);
+
+ if(connect(c->socket, (struct sockaddr *)&a, sizeof(a)) == -1)
+ {
+ close(c->socket);
+ syslog(LOG_ERR, _("%s port %hd: %m"), c->hostname, c->port);
+ return -1;
+ }
+
+ flags = fcntl(c->socket, F_GETFL);
+
+ if(fcntl(c->socket, F_SETFL, flags | O_NONBLOCK) < 0)
{
+ close(c->socket);
syslog(LOG_ERR, _("fcntl for %s port %d: %m"),
- cl->hostname, cl->port);
+ c->hostname, c->port);
return -1;
}
if(debug_lvl >= DEBUG_CONNECTIONS)
syslog(LOG_INFO, _("Connected to %s port %hd"),
- cl->hostname, cl->port);
-
- cl->status.meta = 1;
+ c->hostname, c->port);
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)
+void setup_outgoing_connection(outgoing_t *outgoing)
{
- conn_list_t *ncn;
+ connection_t *c;
+ node_t *n;
struct hostent *h;
- config_t const *cfg;
cp
- if(check_id(name))
- {
- syslog(LOG_ERR, _("Invalid name for outgoing connection"));
- return -1;
- }
+ n = lookup_node(outgoing->name);
+
+ if(n)
+ if(n->connection)
+ {
+ if(debug_lvl >= DEBUG_CONNECTIONS)
+ syslog(LOG_INFO, _("Already connected to %s"), outgoing->name);
+ n->connection->outgoing = outgoing;
+ return;
+ }
- 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)))
+ c = new_connection();
+ c->name = xstrdup(outgoing->name);
+
+ init_configuration(&c->config_tree);
+ read_connection_config(c);
+
+ if(!get_config_string(lookup_config(c->config_tree, "Address"), &c->hostname))
{
- syslog(LOG_ERR, _("No address specified for %s"));
- free_conn_list(ncn);
- return -1;
+ syslog(LOG_ERR, _("No address specified for %s"), c->name);
+ free_connection(c);
+ free(outgoing->name);
+ free(outgoing);
+ return;
}
-
- if(!(h = gethostbyname(cfg->data.ptr)))
+
+ if(!get_config_port(lookup_config(c->config_tree, "Port"), &c->port))
+ c->port = 655;
+
+ if(!(h = gethostbyname(c->hostname)))
{
- syslog(LOG_ERR, _("Error looking up `%s': %m"), cfg->data.ptr);
- free_conn_list(ncn);
- return -1;
+ syslog(LOG_ERR, _("Error looking up `%s': %m"), c->hostname);
+ free_connection(c);
+ retry_outgoing(outgoing);
+ return;
}
- ncn->address = ntohl(*((ip_t*)(h->h_addr_list[0])));
- ncn->hostname = hostlookup(htonl(ncn->address));
-
- if(setup_outgoing_meta_socket(ncn) < 0)
+ c->address = ntohl(*((ipv4_t*)(h->h_addr_list[0])));
+ c->hostname = hostlookup(htonl(c->address));
+
+ if(setup_outgoing_socket(c) < 0)
{
- syslog(LOG_ERR, _("Could not set up a meta connection to %s"),
- ncn->hostname);
- free_conn_list(ncn);
- return -1;
+ syslog(LOG_ERR, _("Could not set up a meta connection to %s (%s)"),
+ c->name, c->hostname);
+ retry_outgoing(outgoing);
+ return;
}
- ncn->status.outgoing = 1;
- ncn->buffer = xmalloc(MAXBUFSIZE);
- ncn->buflen = 0;
- ncn->last_ping_time = time(NULL);
- ncn->want_ping = 0;
+ c->outgoing = outgoing;
+ c->last_ping_time = time(NULL);
- conn_list_add(ncn);
+ connection_add(c);
- send_id(ncn);
+ send_id(c);
cp
- return 0;
}
-/*
- Configure conn_list_t myself and set up the local sockets (listen only)
-*/
-int setup_myself(void)
+int read_rsa_public_key(connection_t *c)
{
- config_t const *cfg;
- subnet_t *net;
+ FILE *fp;
+ char *fname;
+ char *key;
cp
- myself = new_conn_list();
+ if(!c->rsa_key)
+ c->rsa_key = RSA_new();
- asprintf(&myself->hostname, "MYSELF"); /* FIXME? Do hostlookup on ourselves? */
- myself->flags = 0;
- myself->protocol_version = PROT_CURRENT;
+ /* First, check for simple PublicKey statement */
- if(!(cfg = get_config_val(config, tincname))) /* Not acceptable */
+ if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &key))
{
- syslog(LOG_ERR, _("Name for tinc daemon required!"));
- return -1;
+ BN_hex2bn(&c->rsa_key->n, key);
+ BN_hex2bn(&c->rsa_key->e, "FFFF");
+ free(key);
+ return 0;
}
- else
- asprintf(&myself->name, "%s", (char*)cfg->data.val);
- if(check_id(myself->name))
+ /* Else, check for PublicKeyFile statement and read it */
+
+ if(get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
{
- syslog(LOG_ERR, _("Invalid name for myself!"));
+ if(is_safe_path(fname))
+ {
+ if((fp = fopen(fname, "r")) == NULL)
+ {
+ syslog(LOG_ERR, _("Error reading RSA public key file `%s': %m"),
+ fname);
+ free(fname);
+ return -1;
+ }
+ free(fname);
+ c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
+ fclose(fp);
+ if(!c->rsa_key)
+ {
+ syslog(LOG_ERR, _("Reading RSA public key file `%s' failed: %m"),
+ fname);
+ return -1;
+ }
+ return 0;
+ }
+ else
+ {
+ free(fname);
+ return -1;
+ }
+ }
+
+ /* Else, check if a harnessed public key is in the config file */
+
+ asprintf(&fname, "%s/hosts/%s", confbase, c->name);
+ if((fp = fopen(fname, "r")))
+ {
+ c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
+ fclose(fp);
+ }
+
+ free(fname);
+
+ if(c->rsa_key)
+ return 0;
+ else
+ {
+ syslog(LOG_ERR, _("No public key for %s specified!"), c->name);
return -1;
}
+}
+
+int read_rsa_private_key(void)
+{
+ FILE *fp;
+ char *fname, *key;
cp
- if(!(cfg = get_config_val(config, privatekey)))
+ if(get_config_string(lookup_config(config_tree, "PrivateKey"), &key))
{
- syslog(LOG_ERR, _("Private key for tinc daemon required!"));
- return -1;
+ myself->connection->rsa_key = RSA_new();
+ BN_hex2bn(&myself->connection->rsa_key->d, key);
+ BN_hex2bn(&myself->connection->rsa_key->e, "FFFF");
+ free(key);
+ return 0;
+ }
+
+ if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
+ asprintf(&fname, "%s/rsa_key.priv", confbase);
+
+ if(is_safe_path(fname))
+ {
+ if((fp = fopen(fname, "r")) == NULL)
+ {
+ syslog(LOG_ERR, _("Error reading RSA private key file `%s': %m"),
+ fname);
+ free(fname);
+ return -1;
+ }
+ free(fname);
+ myself->connection->rsa_key = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
+ fclose(fp);
+ if(!myself->connection->rsa_key)
+ {
+ syslog(LOG_ERR, _("Reading RSA private key file `%s' failed: %m"),
+ fname);
+ return -1;
+ }
+ return 0;
+ }
+
+ free(fname);
+ return -1;
+}
+
+int check_rsa_key(RSA *rsa_key)
+{
+ char *test1, *test2, *test3;
+cp
+ if(rsa_key->p && rsa_key->q)
+ {
+ if(RSA_check_key(rsa_key) != 1)
+ return -1;
}
else
{
- myself->rsa_key = RSA_new();
- BN_hex2bn(&myself->rsa_key->d, cfg->data.ptr);
- BN_hex2bn(&myself->rsa_key->e, "FFFF");
+ test1 = xmalloc(RSA_size(rsa_key));
+ test2 = xmalloc(RSA_size(rsa_key));
+ test3 = xmalloc(RSA_size(rsa_key));
+
+ if(RSA_public_encrypt(RSA_size(rsa_key), test1, test2, rsa_key, RSA_NO_PADDING) != RSA_size(rsa_key))
+ return -1;
+
+ if(RSA_private_decrypt(RSA_size(rsa_key), test2, test3, rsa_key, RSA_NO_PADDING) != RSA_size(rsa_key))
+ return -1;
+
+ if(memcmp(test1, test3, RSA_size(rsa_key)))
+ return -1;
}
+cp
+ return 0;
+}
+
+/*
+ Configure node_t myself and set up the local sockets (listen only)
+*/
+int setup_myself(void)
+{
+ config_t *cfg;
+ subnet_t *subnet;
+ char *name, *mode, *cipher, *digest;
+ int choice;
+cp
+ myself = new_node();
+ myself->connection = new_connection();
+ init_configuration(&myself->connection->config_tree);
+
+ asprintf(&myself->hostname, _("MYSELF"));
+ asprintf(&myself->connection->hostname, _("MYSELF"));
- if(read_host_config(myself))
+ myself->connection->options = 0;
+ myself->connection->protocol_version = PROT_CURRENT;
+
+ if(!get_config_string(lookup_config(config_tree, "Name"), &name)) /* Not acceptable */
{
- syslog(LOG_ERR, _("Cannot open host configuration file for myself!"));
+ syslog(LOG_ERR, _("Name for tinc daemon required!"));
return -1;
}
-cp
- if(!(cfg = get_config_val(myself->config, publickey)))
+
+ if(check_id(name))
{
- syslog(LOG_ERR, _("Public key for tinc daemon required!"));
+ syslog(LOG_ERR, _("Invalid name for myself!"));
+ free(name);
return -1;
}
- else
+
+ myself->name = name;
+ myself->connection->name = xstrdup(name);
+
+cp
+ if(read_rsa_private_key())
+ return -1;
+
+ if(read_connection_config(myself->connection))
{
- BN_hex2bn(&myself->rsa_key->n, cfg->data.ptr);
+ syslog(LOG_ERR, _("Cannot open host configuration file for myself!"));
+ return -1;
}
-/*
- if(RSA_check_key(myself->rsa_key) != 1)
+
+ if(read_rsa_public_key(myself->connection))
+ return -1;
+cp
+
+ if(check_rsa_key(myself->connection->rsa_key))
{
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(!get_config_port(lookup_config(myself->connection->config_tree, "Port"), &myself->port))
+ myself->port = 655;
- if((cfg = get_config_val(myself->config, tcponly)))
- if(cfg->data.val == stupid_true)
- myself->flags |= TCPONLY;
+ myself->connection->port = myself->port;
/* Read in all the subnets specified in the host configuration file */
- for(cfg = myself->config; (cfg = get_config_val(cfg, subnet)); cfg = cfg->next)
+ cfg = lookup_config(myself->connection->config_tree, "Subnet");
+
+ while(cfg)
+ {
+ if(!get_config_subnet(cfg, &subnet))
+ return -1;
+
+ subnet_add(myself, subnet);
+
+ cfg = lookup_config_next(myself->connection->config_tree, cfg);
+ }
+
+cp
+ /* Check some options */
+
+ if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice))
+ if(choice)
+ myself->options |= OPTION_INDIRECT;
+
+ if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice))
+ if(choice)
+ myself->options |= OPTION_TCPONLY;
+
+ if(get_config_bool(lookup_config(myself->connection->config_tree, "IndirectData"), &choice))
+ if(choice)
+ myself->options |= OPTION_INDIRECT;
+
+ if(get_config_bool(lookup_config(myself->connection->config_tree, "TCPOnly"), &choice))
+ if(choice)
+ myself->options |= OPTION_TCPONLY;
+
+ if(myself->options & OPTION_TCPONLY)
+ myself->options |= OPTION_INDIRECT;
+
+ if(get_config_string(lookup_config(config_tree, "Mode"), &mode))
{
- 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)
+ if(!strcasecmp(mode, "router"))
+ routing_mode = RMODE_ROUTER;
+ else if (!strcasecmp(mode, "switch"))
+ routing_mode = RMODE_SWITCH;
+ else if (!strcasecmp(mode, "hub"))
+ routing_mode = RMODE_HUB;
+ else
{
- syslog(LOG_ERR, _("Network address and subnet mask do not match!"));
+ syslog(LOG_ERR, _("Invalid routing mode!"));
return -1;
- }
-
- subnet_add(myself, net);
+ }
}
-
- if((myself->meta_socket = setup_listen_meta_socket(myself->port)) < 0)
+ else
+ routing_mode = RMODE_ROUTER;
+
+cp
+ /* Open sockets */
+
+ if((tcp_socket = setup_listen_socket(myself->port)) < 0)
{
- syslog(LOG_ERR, _("Unable to set up a listening socket!"));
+ syslog(LOG_ERR, _("Unable to set up a listening TCP socket!"));
return -1;
}
- if((myself->socket = setup_vpn_in_socket(myself->port)) < 0)
+ if((udp_socket = setup_vpn_in_socket(myself->port)) < 0)
{
- syslog(LOG_ERR, _("Unable to set up an incoming vpn data socket!"));
- close(myself->meta_socket);
+ syslog(LOG_ERR, _("Unable to set up a listening UDP socket!"));
return -1;
}
-
+cp
/* Generate packet encryption key */
- myself->cipher_pkttype = EVP_bf_cfb();
+ if(get_config_string(lookup_config(myself->connection->config_tree, "Cipher"), &cipher))
+ {
+ if(!strcasecmp(cipher, "none"))
+ {
+ myself->cipher = NULL;
+ }
+ else
+ {
+ if(!(myself->cipher = EVP_get_cipherbyname(cipher)))
+ {
+ syslog(LOG_ERR, _("Unrecognized cipher type!"));
+ return -1;
+ }
+ }
+ }
+ else
+ myself->cipher = EVP_bf_cbc();
- myself->cipher_pktkeylength = myself->cipher_pkttype->key_len + myself->cipher_pkttype->iv_len;
+ if(myself->cipher)
+ myself->keylength = myself->cipher->key_len + myself->cipher->iv_len;
+ else
+ myself->keylength = 1;
- myself->cipher_pktkey = (char *)xmalloc(myself->cipher_pktkeylength);
- RAND_bytes(myself->cipher_pktkey, myself->cipher_pktkeylength);
+ myself->key = (char *)xmalloc(myself->keylength);
+ RAND_pseudo_bytes(myself->key, myself->keylength);
- if(!(cfg = get_config_val(config, keyexpire)))
+ if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
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;
-}
+ keyexpires = time(NULL) + keylifetime;
-RETSIGTYPE
-sigalrm_handler(int a)
-{
- config_t const *cfg;
-cp
- cfg = get_config_val(upstreamcfg, connectto);
+ /* Check if we want to use message authentication codes... */
- if(!cfg && upstreamcfg == config)
- /* No upstream IP given, we're listen only. */
- return;
+ if(get_config_string(lookup_config(myself->connection->config_tree, "Digest"), &digest))
+ {
+ if(!strcasecmp(digest, "none"))
+ {
+ myself->digest = NULL;
+ }
+ else
+ {
+ if(!(myself->digest = EVP_get_digestbyname(digest)))
+ {
+ syslog(LOG_ERR, _("Unrecognized digest type!"));
+ return -1;
+ }
+ }
+ }
+ else
+ myself->digest = EVP_sha1();
- while(cfg)
+ if(get_config_int(lookup_config(myself->connection->config_tree, "MACLength"), &myself->maclength))
{
- upstreamcfg = cfg->next;
- if(!setup_outgoing_connection(cfg->data.ptr)) /* function returns 0 when there are no problems */
+ if(myself->digest)
{
- signal(SIGALRM, SIG_IGN);
- return;
+ if(myself->maclength > myself->digest->md_size)
+ {
+ syslog(LOG_ERR, _("MAC length exceeds size of digest!"));
+ return -1;
+ }
+ else if (myself->maclength < 0)
+ {
+ syslog(LOG_ERR, _("Bogus MAC length!"));
+ return -1;
+ }
}
- cfg = get_config_val(upstreamcfg, connectto); /* Or else we try the next ConnectTo line */
}
+ else
+ myself->maclength = 4;
+cp
+ /* Done */
- 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);
+ myself->nexthop = myself;
+ myself->via = myself;
+ myself->status.active = 1;
+ node_add(myself);
+
+ graph();
+
+ syslog(LOG_NOTICE, _("Ready: listening on port %hd"), myself->port);
cp
+ return 0;
}
/*
*/
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;
+ init_connections();
+ init_subnets();
+ init_nodes();
+ init_edges();
+ init_events();
- if(setup_tap_fd() < 0)
- return -1;
+ if(get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
+ {
+ if(pingtimeout < 1)
+ {
+ pingtimeout = 86400;
+ }
+ }
+ else
+ pingtimeout = 60;
- if(setup_myself() < 0)
+ if(setup_device() < 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);
+ if(setup_myself() < 0)
+ return -1;
+
+ try_outgoing_connections();
cp
return 0;
}
*/
void close_network_connections(void)
{
- conn_list_t *p;
+ avl_node_t *node, *next;
+ connection_t *c;
cp
- for(p = conn_list; p != NULL; p = p->next)
+ for(node = connection_tree->head; node; node = next)
{
- p->status.active = 0;
- terminate_connection(p);
+ next = node->next;
+ c = (connection_t *)node->data;
+ if(c->outgoing)
+ free(c->outgoing->name), free(c->outgoing);
+ terminate_connection(c, 0);
}
- if(myself)
- if(myself->status.active)
- {
- close(myself->meta_socket);
- close(myself->socket);
- free_conn_list(myself);
- myself = NULL;
- }
+ if(myself && myself->connection)
+ terminate_connection(myself->connection, 0);
- close(tap_fd);
+ close(udp_socket);
+ close(tcp_socket);
- /* Execute tinc-down script right after shutting down the interface */
- execute_script("tinc-down");
+ exit_events();
+ exit_edges();
+ exit_subnets();
+ exit_nodes();
+ exit_connections();
- destroy_conn_list();
+ execute_script("tinc-down");
- syslog(LOG_NOTICE, _("Terminating"));
+ close_device();
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)
+connection_t *create_new_connection(int sfd)
{
- conn_list_t *p;
+ connection_t *c;
struct sockaddr_in ci;
int len = sizeof(ci);
cp
- p = new_conn_list();
+ c = new_connection();
- if(getpeername(sfd, &ci, &len) < 0)
+ if(getpeername(sfd, (struct sockaddr *) &ci, (socklen_t *) &len) < 0)
{
syslog(LOG_ERR, _("System call `%s' failed: %m"),
"getpeername");
+ close(sfd);
return NULL;
}
- p->name = unknown;
- p->address = ntohl(ci.sin_addr.s_addr);
- p->hostname = hostlookup(ci.sin_addr.s_addr);
- p->meta_socket = sfd;
- p->status.meta = 1;
- p->buffer = xmalloc(MAXBUFSIZE);
- p->buflen = 0;
- p->last_ping_time = time(NULL);
- p->want_ping = 0;
-
+ c->address = ntohl(ci.sin_addr.s_addr);
+ c->hostname = hostlookup(ci.sin_addr.s_addr);
+ c->port = htons(ci.sin_port);
+ c->socket = sfd;
+ c->last_ping_time = time(NULL);
+
if(debug_lvl >= DEBUG_CONNECTIONS)
syslog(LOG_NOTICE, _("Connection from %s port %d"),
- p->hostname, htons(ci.sin_port));
+ c->hostname, c->port);
- p->allow_request = ID;
+ c->allow_request = ID;
cp
- return p;
+ return c;
}
/*
*/
void build_fdset(fd_set *fs)
{
- conn_list_t *p;
+ avl_node_t *node;
+ connection_t *c;
cp
FD_ZERO(fs);
- for(p = conn_list; p != NULL; p = p->next)
+ for(node = connection_tree->head; node; node = node->next)
{
- if(p->status.meta)
- FD_SET(p->meta_socket, fs);
- if(p->status.dataopen)
- FD_SET(p->socket, fs);
+ c = (connection_t *)node->data;
+ FD_SET(c->socket, fs);
}
- FD_SET(myself->meta_socket, fs);
- FD_SET(myself->socket, fs);
- FD_SET(tap_fd, fs);
+ FD_SET(tcp_socket, fs);
+ FD_SET(udp_socket, fs);
+ FD_SET(device_fd, fs);
cp
}
udp socket and write it to the ethertap
device after being decrypted
*/
-int handle_incoming_vpn_data()
+void handle_incoming_vpn_data(void)
{
vpn_packet_t pkt;
int x, l = sizeof(x);
- struct sockaddr from;
- int lenin;
+ struct sockaddr_in from;
socklen_t fromlen = sizeof(from);
+ node_t *n;
cp
- if(getsockopt(myself->socket, SOL_SOCKET, SO_ERROR, &x, &l) < 0)
+ if(getsockopt(udp_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;
+ __FILE__, __LINE__, udp_socket);
+ return;
}
if(x)
{
syslog(LOG_ERR, _("Incoming data socket error: %s"), strerror(x));
- return -1;
+ return;
}
- if((lenin = recvfrom(myself->socket, (char *) &(pkt.len), MTU, 0, &from, &fromlen)) <= 0)
+ if((pkt.len = recvfrom(udp_socket, (char *)&pkt.seqno, MAXSIZE, 0, (struct sockaddr *)&from, &fromlen)) <= 0)
{
syslog(LOG_ERR, _("Receiving packet failed: %m"));
- return -1;
+ return;
}
- if(debug_lvl >= DEBUG_TRAFFIC)
+ n = lookup_node_udp(ntohl(from.sin_addr.s_addr), ntohs(from.sin_port));
+
+ if(!n)
{
- syslog(LOG_DEBUG, _("Received packet of %d bytes"), lenin);
- }
+ syslog(LOG_WARNING, _("Received UDP packet on port %hd from unknown source %x:%hd"), myself->port, ntohl(from.sin_addr.s_addr), ntohs(from.sin_port));
+ return;
+ }
+/*
+ if(n->connection)
+ n->connection->last_ping_time = time(NULL);
+*/
+ receive_udppacket(n, &pkt);
cp
- return xrecv(&pkt);
}
-/*
- terminate a connection and notify the other
- end before closing the sockets
-*/
-void terminate_connection(conn_list_t *cl)
+/* Purge edges and subnets of unreachable nodes. Use carefully. */
+
+void purge(void)
{
- conn_list_t *p;
+ avl_node_t *nnode, *nnext, *enode, *enext, *snode, *snext, *cnode;
+ node_t *n;
+ edge_t *e;
subnet_t *s;
+ connection_t *c;
cp
- if(cl->status.remove)
- return;
+ if(debug_lvl >= DEBUG_PROTOCOL)
+ syslog(LOG_DEBUG, _("Purging unreachable nodes"));
- cl->status.remove = 1;
+ for(nnode = node_tree->head; nnode; nnode = nnext)
+ {
+ nnext = nnode->next;
+ n = (node_t *)nnode->data;
- 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);
+ if(!n->status.reachable)
+ {
+ if(debug_lvl >= DEBUG_SCARY_THINGS)
+ syslog(LOG_DEBUG, _("Purging node %s (%s)"), n->name, n->hostname);
+
+ for(snode = n->subnet_tree->head; snode; snode = snext)
+ {
+ snext = snode->next;
+ s = (subnet_t *)snode->data;
+
+ for(cnode = connection_tree->head; cnode; cnode = cnode->next)
+ {
+ c = (connection_t *)cnode->data;
+ if(c->status.active)
+ send_del_subnet(c, s);
+ }
+
+ subnet_del(n, s);
+ }
+
+ for(enode = n->edge_tree->head; enode; enode = enext)
+ {
+ enext = enode->next;
+ e = (edge_t *)enode->data;
+
+ for(cnode = connection_tree->head; cnode; cnode = cnode->next)
+ {
+ c = (connection_t *)cnode->data;
+ if(c->status.active)
+ send_del_edge(c, e);
+ }
+
+ edge_del(e);
+ }
+ node_del(n);
+ }
+ }
cp
- /* Find all connections that were lost because they were behind cl
- (the connection that was dropped). */
+}
- if(cl->status.meta)
- for(p = conn_list; p != NULL; p = p->next)
- if((p->nexthop == cl) && (p != cl))
- terminate_connection(p); /* Sounds like recursion, but p does not have a meta connection :) */
+/*
+ Terminate a connection:
+ - Close the socket
+ - Remove associated edge and tell other connections about it if report = 1
+ - Check if we need to retry making an outgoing connection
+ - Deactivate the host
+*/
+void terminate_connection(connection_t *c, int report)
+{
+ avl_node_t *node;
+ connection_t *other;
+cp
+ if(c->status.remove)
+ return;
+
+ if(debug_lvl >= DEBUG_CONNECTIONS)
+ syslog(LOG_NOTICE, _("Closing connection with %s (%s)"),
+ c->name, c->hostname);
- /* Inform others of termination if it was still active */
+ c->status.remove = 1;
+
+ 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)
+ {
+ for(node = connection_tree->head; node; node = node->next)
+ {
+ other = (connection_t *)node->data;
+ if(other->status.active && other != c)
+ send_del_edge(other, c->edge);
+ }
+ }
- /* Remove the associated subnets */
+ edge_del(c->edge);
+ }
- for(s = cl->subnets; s; s = s->next)
- subnet_del(s);
+ /* Run MST and SSSP algorithms */
+
+ graph();
/* Check if this was our outgoing connection */
-
- if(cl->status.outgoing && cl->status.active)
+
+ if(c->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"));
+ retry_outgoing(c->outgoing);
+ c->outgoing = NULL;
}
- /* Inactivate */
+ /* Deactivate */
- cl->status.active = 0;
+ c->status.active = 0;
+ if(c->node)
+ c->node->connection = NULL;
+ do_prune = 1;
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;
+ avl_node_t *node, *next;
+ connection_t *c;
cp
now = time(NULL);
- for(p = conn_list; p != NULL; p = p->next)
+
+ for(node = connection_tree->head; node; node = next)
{
- if(p->status.active && p->status.meta)
- {
- if(p->last_ping_time + timeout < now)
+ 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);
+ 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);
}
}
- }
+ else
+ {
+ if(debug_lvl >= DEBUG_CONNECTIONS)
+ syslog(LOG_WARNING, _("Timeout from %s (%s) during authentication"),
+ c->name, c->hostname);
+ terminate_connection(c, 0);
+ }
+ }
}
cp
- return 0;
}
/*
*/
int handle_new_meta_connection()
{
- conn_list_t *ncn;
+ connection_t *new;
struct sockaddr client;
- int nfd, len = sizeof(client);
+ int fd, len = sizeof(client);
cp
- if((nfd = accept(myself->meta_socket, &client, &len)) < 0)
+ if((fd = accept(tcp_socket, &client, &len)) < 0)
{
syslog(LOG_ERR, _("Accepting a new connection failed: %m"));
return -1;
}
- if(!(ncn = create_new_connection(nfd)))
+ if(!(new = create_new_connection(fd)))
{
- shutdown(nfd, 2);
- close(nfd);
+ shutdown(fd, 2);
+ close(fd);
syslog(LOG_NOTICE, _("Closed attempted connection"));
return 0;
}
- conn_list_add(ncn);
+ connection_add(new);
+
+ send_id(new);
cp
return 0;
}
+void try_outgoing_connections(void)
+{
+ static config_t *cfg = NULL;
+ char *name;
+ outgoing_t *outgoing;
+cp
+ for(cfg = lookup_config(config_tree, "ConnectTo"); cfg; cfg = lookup_config_next(config_tree, cfg))
+ {
+ get_config_string(cfg, &name);
+
+ if(check_id(name))
+ {
+ syslog(LOG_ERR, _("Invalid name for outgoing connection in %s line %d"), cfg->file, cfg->line);
+ free(name);
+ continue;
+ }
+
+ outgoing = xmalloc_and_zero(sizeof(*outgoing));
+ outgoing->name = name;
+ setup_outgoing_connection(outgoing);
+ }
+}
+
/*
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);
+ connection_t *c;
+ avl_node_t *node;
cp
- for(p = conn_list; p != NULL; p = p->next)
+ if(FD_ISSET(udp_socket, f))
+ handle_incoming_vpn_data();
+
+ for(node = connection_tree->head; node; node = node->next)
{
- if(p->status.remove)
- continue;
+ c = (connection_t *)node->data;
+
+ if(c->status.remove)
+ return;
- if(p->status.dataopen)
- if(FD_ISSET(p->socket, f))
+ if(FD_ISSET(c->socket, f))
+ if(receive_meta(c) < 0)
{
- /*
- 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);
+ terminate_connection(c, c->status.active);
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))
+ if(FD_ISSET(tcp_socket, f))
handle_new_meta_connection();
cp
}
-/*
- read, encrypt and send data that is
- available through the ethertap device
-*/
-void handle_tap_input(void)
+void prune_connections(void)
{
- vpn_packet_t vp;
- int lenin;
-cp
- if(taptype == TAP_TYPE_TUNTAP)
- {
- if((lenin = read(tap_fd, vp.data, MTU)) <= 0)
- {
- syslog(LOG_ERR, _("Error while reading from tun/tap device: %m"));
- return;
- }
- vp.len = lenin;
- }
- else /* ethertap */
- {
- if((lenin = read(tap_fd, vp.data - 2, MTU)) <= 0)
- {
- syslog(LOG_ERR, _("Error while reading from ethertap device: %m"));
- return;
- }
- vp.len = lenin - 2;
- }
-
- total_tap_in += lenin;
-
- if(lenin < 32)
+ connection_t *c;
+ avl_node_t *node, *next;
+cp
+ for(node = connection_tree->head; node; node = next)
{
- if(debug_lvl >= DEBUG_TRAFFIC)
- syslog(LOG_WARNING, _("Received short packet from tap device"));
- return;
- }
+ next = node->next;
+ c = (connection_t *)node->data;
- if(debug_lvl >= DEBUG_TRAFFIC)
- {
- syslog(LOG_DEBUG, _("Read packet of length %d from tap device"), vp.len);
+ if(c->status.remove)
+ connection_del(c);
}
-
- send_packet(ntohl(*((unsigned long*)(&vp.data[30]))), &vp);
+
+ if(!connection_tree->head)
+ purge();
cp
}
int r;
time_t last_ping_check;
int t;
+ event_t *event;
+ vpn_packet_t packet;
cp
last_ping_check = time(NULL);
+ srand(time(NULL));
+
for(;;)
{
- tv.tv_sec = timeout;
+ tv.tv_sec = 1 + (rand() & 7); /* Approx. 5 seconds, randomized to prevent global synchronisation effects */
tv.tv_usec = 0;
- prune_conn_list();
+ if(do_prune)
+ {
+ prune_connections();
+ do_prune = 0;
+ }
+
build_fdset(&fset);
if((r = select(FD_SETSIZE, &fset, NULL, NULL, &tv)) < 0)
{
- if(errno != EINTR) /* because of alarm */
+ if(errno != EINTR) /* because of a signal */
{
syslog(LOG_ERR, _("Error while waiting for input: %m"));
return;
syslog(LOG_INFO, _("Rereading configuration file and restarting in 5 seconds"));
sighup = 0;
close_network_connections();
- clear_config(&config);
+ exit_configuration(&config_tree);
if(read_server_config())
{
syslog(LOG_ERR, _("Unable to reread configuration file, exiting"));
- exit(0);
+ exit(1);
}
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)
+ if(last_ping_check + pingtimeout < t)
{
check_dead_connections();
last_ping_check = time(NULL);
{
if(debug_lvl >= DEBUG_STATUS)
syslog(LOG_INFO, _("Regenerating symmetric key"));
-
- RAND_bytes(myself->cipher_pktkey, myself->cipher_pktkeylength);
- send_key_changed(myself, NULL);
+
+ RAND_pseudo_bytes(myself->key, myself->keylength);
+ send_key_changed(myself->connection, myself);
keyexpires = time(NULL) + keylifetime;
}
}
+ 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;
+ }
+
+ while((event = get_expired_event()))
+ {
+ event->handler(event->data);
+ free(event);
+ }
+
if(r > 0)
{
check_network_activity(&fset);
/* local tap data */
- if(FD_ISSET(tap_fd, &fset))
- handle_tap_input();
+ if(FD_ISSET(device_fd, &fset))
+ {
+ if(!read_packet(&packet))
+ route_outgoing(&packet);
+ }
}
}
cp
projects / tinc / blobdiff