/*
net.c -- most of the network code
- Copyright (C) 1998,1999,2000 Ivo Timmermans <zarq@iname.com>
+ Copyright (C) 1998-2001 Ivo Timmermans <itimmermans@bigfoot.com>,
+ 2000,2001 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
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 1.35.4.137 2001/10/27 12:13:17 guus Exp $
*/
#include "config.h"
-#include <arpa/inet.h>
#include <errno.h>
#include <fcntl.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 <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/pem.h>
+
+#ifndef HAVE_RAND_PSEUDO_BYTES
+#define RAND_pseudo_bytes RAND_bytes
+#endif
-#include <cipher.h>
#include <utils.h>
#include <xalloc.h>
+#include <avl_tree.h>
+#include <list.h>
#include "conf.h"
-#include "encr.h"
+#include "connection.h"
+#include "meta.h"
#include "net.h"
#include "netutl.h"
+#include "process.h"
#include "protocol.h"
+#include "subnet.h"
+#include "process.h"
+#include "route.h"
+#include "device.h"
-int tap_fd = -1;
+#include "system.h"
-int total_tap_in = 0;
-int total_tap_out = 0;
-int total_socket_in = 0;
-int total_socket_out = 0;
+int seconds_till_retry = 5;
+int tcp_socket = -1;
+int udp_socket = -1;
-time_t last_ping_time = 0;
+int keylifetime = 0;
+int keyexpires = 0;
-/* The global list of existing connections */
-conn_list_t *conn_list = NULL;
-conn_list_t *myself = NULL;
+/* VPN packet I/O */
-/*
- strip off the MAC adresses of an ethernet frame
-*/
-void strip_mac_addresses(vpn_packet_t *p)
+void receive_udppacket(node_t *n, vpn_packet_t *inpkt)
{
- unsigned char tmp[MAXSIZE];
-cp
- memcpy(tmp, p->data, p->len);
- p->len -= 12;
- memcpy(p->data, &tmp[12], p->len);
+ vpn_packet_t outpkt;
+ int outlen, outpad;
+ EVP_CIPHER_CTX ctx;
cp
-}
+ /* Decrypt the packet */
-/*
- reassemble MAC addresses
-*/
-void add_mac_addresses(vpn_packet_t *p)
-{
- unsigned char tmp[MAXSIZE];
-cp
- memcpy(&tmp[12], p->data, p->len);
- p->len += 12;
- tmp[0] = tmp[6] = 0xfe;
- tmp[1] = tmp[7] = 0xfd;
- *((ip_t*)(&tmp[2])) = (ip_t)(htonl(myself->vpn_ip));
- *((ip_t*)(&tmp[8])) = *((ip_t*)(&tmp[26]));
- memcpy(p->data, &tmp[0], p->len);
+ EVP_DecryptInit(&ctx, myself->cipher, myself->key, myself->key + myself->cipher->key_len);
+ EVP_DecryptUpdate(&ctx, outpkt.salt, &outlen, inpkt->salt, inpkt->len);
+ EVP_DecryptFinal(&ctx, outpkt.salt + outlen, &outpad);
+ outlen += outpad;
+ outpkt.len = outlen - sizeof(outpkt.salt);
+
+ receive_packet(n, &outpkt);
cp
}
-int xsend(conn_list_t *cl, void *packet)
+void receive_tcppacket(connection_t *c, char *buffer, int len)
{
- int r;
- real_packet_t rp;
+ vpn_packet_t outpkt;
cp
- do_encrypt((vpn_packet_t*)packet, &rp, cl->key);
- rp.from = htonl(myself->vpn_ip);
- rp.data.len = htons(rp.data.len);
- rp.len = htons(rp.len);
-
- if(debug_lvl > 3)
- syslog(LOG_ERR, "Sent %d bytes to %lx", ntohs(rp.len), cl->vpn_ip);
-
- if((r = send(cl->socket, (char*)&rp, ntohs(rp.len), 0)) < 0)
- {
- syslog(LOG_ERR, "Error sending data: %m");
- return -1;
- }
+ outpkt.len = len;
+ memcpy(outpkt.data, buffer, len);
- total_socket_out += r;
+ receive_packet(c->node, &outpkt);
cp
- return 0;
}
-int xrecv(conn_list_t *cl, void *packet)
+void receive_packet(node_t *n, vpn_packet_t *packet)
{
- vpn_packet_t vp;
- int lenin;
cp
- do_decrypt((real_packet_t*)packet, &vp, cl->key);
- add_mac_addresses(&vp);
+ if(debug_lvl >= DEBUG_TRAFFIC)
+ syslog(LOG_DEBUG, _("Received packet of %d bytes from %s (%s)"), packet->len, n->name, n->hostname);
- if((lenin = write(tap_fd, &vp, vp.len + sizeof(vp.len))) < 0)
- syslog(LOG_ERR, "Can't write to tap device: %m");
- else
- total_tap_out += lenin;
+ 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
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, "packet to queue: %d", s);
-
- e = xmalloc(sizeof(*e));
- e->packet = xmalloc(s);
- memcpy(e->packet, packet, s);
-
- if(!*q)
+ 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
-}
+ list_insert_tail(n->queue, copy);
-/* 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;
- }
+ 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;
- }
+ RAND_pseudo_bytes(inpkt->salt, sizeof(inpkt->salt));
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, "queue flushed");
-cp
-}
+ EVP_EncryptInit(&ctx, n->cipher, n->key, n->key + n->cipher->key_len);
+ EVP_EncryptUpdate(&ctx, outpkt.salt, &outlen, inpkt->salt, inpkt->len + sizeof(inpkt->salt));
+ EVP_EncryptFinal(&ctx, outpkt.salt + outlen, &outpad);
+ outlen += outpad;
-/*
- flush the send&recv queues
- void because nothing goes wrong here, packets
- remain in the queue if something goes wrong
-*/
-void flush_queues(conn_list_t *cl)
-{
-cp
- if(cl->sq)
- {
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, "Flushing send queue for " IP_ADDR_S,
- IP_ADDR_V(cl->vpn_ip));
- flush_queue(cl, &(cl->sq), xsend);
- }
+ to.sin_family = AF_INET;
+ to.sin_addr.s_addr = htonl(n->address);
+ to.sin_port = htons(n->port);
- if(cl->rq)
+ if((sendto(socket, (char *) outpkt.salt, outlen, 0, (const struct sockaddr *)&to, tolen)) < 0)
{
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, "Flushing receive queue for " IP_ADDR_S,
- IP_ADDR_V(cl->vpn_ip));
- flush_queue(cl, &(cl->rq), xrecv);
+ 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;
cp
- if((cl = lookup_conn(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 > 2)
+ if(debug_lvl >= DEBUG_TRAFFIC)
{
- syslog(LOG_NOTICE, "trying to look up " IP_ADDR_S " in connection list failed.",
- IP_ADDR_V(to));
- }
- for(cl = conn_list; cl != NULL && !cl->status.outgoing; cl = cl->next);
- if(!cl)
- { /* No open outgoing connection has been found. */
- if(debug_lvl > 2)
- syslog(LOG_NOTICE, "There is no remote host I can send this packet to.");
- return -1;
+ syslog(LOG_NOTICE, _("Packet is looping back to us!"));
}
+
+ return;
}
- if(my_key_expiry <= time(NULL))
- regenerate_keys();
+ if(!n->status.active)
+ {
+ if(debug_lvl >= DEBUG_TRAFFIC)
+ syslog(LOG_INFO, _("%s (%s) is not active, dropping packet"),
+ n->name, n->hostname);
- if(!cl->status.dataopen)
- if(setup_vpn_connection(cl) < 0)
- return -1;
+ return;
+ }
+/* FIXME
+ if(n->via == myself)
+ via = n->nexthop;
+ else
+ via = n->via;
- if(!cl->status.validkey)
+ if(via != n && debug_lvl >= DEBUG_TRAFFIC)
+ syslog(LOG_ERR, _("Sending packet to %s via %s (%s)"),
+ n->name, via->name, via->hostname);
+
+ if((myself->options | via->options) & OPTION_TCPONLY)
{
- add_queue(&(cl->sq), packet, packet->len + 2);
- if(!cl->status.waitingforkey)
- send_key_request(cl->vpn_ip); /* Keys should be sent to the host running the tincd */
- return 0;
+ if(send_tcppacket(via->connection, packet))
+ terminate_connection(via->connection, 1);
}
+ else
+ send_udppacket(via, packet);
+*/
+}
- if(!cl->status.active)
+/* Broadcast a packet to all active direct connections */
+
+void broadcast_packet(node_t *from, vpn_packet_t *packet)
+{
+ avl_node_t *node;
+ connection_t *c;
+cp
+ 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)
{
- add_queue(&(cl->sq), packet, packet->len + 2);
- if(debug_lvl > 1)
- syslog(LOG_INFO, IP_ADDR_S " is not ready, queueing packet.", IP_ADDR_V(cl->vpn_ip));
- return 0; /* We don't want to mess up, do we? */
+ c = (connection_t *)node->data;
+ if(c->status.active && c != from->nexthop->connection)
+ send_packet(c->node, packet);
}
-
- /* can we send it? can we? can we? huh? */
cp
- return xsend(cl, packet);
}
-/*
- open the local ethertap device
-*/
-int setup_tap_fd(void)
+void flush_queue(node_t *n)
{
- int nfd;
- const char *tapfname;
- config_t const *cfg;
-cp
- if((cfg = get_config_val(tapdevice)) == NULL)
- tapfname = "/dev/tap0";
- else
- tapfname = cfg->data.ptr;
+ list_node_t *node, *next;
+cp
+ if(debug_lvl >= DEBUG_TRAFFIC)
+ syslog(LOG_INFO, _("Flushing queue for %s (%s)"), n->name, n->hostname);
- if((nfd = open(tapfname, O_RDWR | O_NONBLOCK)) < 0)
+ for(node = n->queue->head; node; node = next)
{
- syslog(LOG_ERR, "Could not open %s: %m", tapfname);
- return -1;
+ next = node->next;
+ send_udppacket(n, (vpn_packet_t *)node->data);
+ list_delete_node(n->queue, node);
}
-
- tap_fd = nfd;
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(int port)
{
int nfd, flags;
struct sockaddr_in a;
- const int one = 1;
+ int option;
+ char *interface;
+ char *address;
+ ip_mask_t *ipmask;
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");
+ syslog(LOG_ERR, _("Creating metasocket failed: %m"));
return -1;
}
flags = fcntl(nfd, F_GETFL);
if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0)
{
- syslog(LOG_ERR, "fcntl: %m");
+ close(nfd);
+ syslog(LOG_ERR, _("System call `%s' failed: %m"),
+ "fcntl");
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_port = htons(port);
a.sin_addr.s_addr = htonl(INADDR_ANY);
+ a.sin_port = htons(port);
+
+ if(get_config_string(lookup_config(config_tree, "BindToAddress"), &address))
+ {
+ ipmask = strtoip(address);
+ if(ipmask)
+ {
+ a.sin_addr.s_addr = htonl(ipmask->address);
+ free(ipmask);
+ }
+ }
if(bind(nfd, (struct sockaddr *)&a, sizeof(struct sockaddr)))
{
- syslog(LOG_ERR, "Can't bind to port %hd/tcp: %m", port);
+ close(nfd);
+ syslog(LOG_ERR, _("Can't bind to port %hd/tcp: %m"), port);
return -1;
}
if(listen(nfd, 3))
{
- syslog(LOG_ERR, "listen: %m");
+ close(nfd);
+ 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;
cp
if((nfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
{
- syslog(LOG_ERR, "Creating socket failed: %m");
+ close(nfd);
+ 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;
- }
+ setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
flags = fcntl(nfd, F_GETFL);
if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0)
{
- syslog(LOG_ERR, "fcntl: %m");
+ close(nfd);
+ syslog(LOG_ERR, _("System call `%s' failed: %m"),
+ "fcntl");
return -1;
}
if(bind(nfd, (struct sockaddr *)&a, sizeof(struct sockaddr)))
{
- syslog(LOG_ERR, "Can't bind to port %hd/udp: %m", port);
+ close(nfd);
+ 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 setup_outgoing_socket(connection_t *c)
{
int flags;
struct sockaddr_in a;
- config_t const *cfg;
+ int option;
cp
- if((cfg = get_config_val(upstreamport)) == NULL)
- cl->port = 655;
- else
- cl->port = cfg->data.val;
+ if(debug_lvl >= DEBUG_CONNECTIONS)
+ syslog(LOG_INFO, _("Trying to connect to %s (%s)"), c->name, c->hostname);
+
+ 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 failed: %m");
+ syslog(LOG_ERR, _("Creating socket for %s port %d failed: %m"),
+ 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->real_ip);
+ 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, IP_ADDR_S ":%d: %m", IP_ADDR_V(cl->real_ip), 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)
{
- syslog(LOG_ERR, "fcntl: %m");
+ close(c->socket);
+ syslog(LOG_ERR, _("%s port %hd: %m"), c->hostname, c->port);
return -1;
}
- cl->hostname = hostlookup(htonl(cl->real_ip));
+ 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"),
+ c->hostname, c->port);
+ return -1;
+ }
- syslog(LOG_INFO, "Connected to %s:%hd" , cl->hostname, cl->port);
+ if(debug_lvl >= DEBUG_CONNECTIONS)
+ syslog(LOG_INFO, _("Connected to %s port %hd"),
+ 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(ip_t ip)
+int setup_outgoing_connection(char *name)
{
- conn_list_t *ncn;
+ connection_t *c;
+ struct hostent *h;
cp
- ncn = new_conn_list();
- ncn->real_ip = ip;
+ c = new_connection();
+ c->name = xstrdup(name);
+
+ read_connection_config(c);
+
+ if(!get_config_string(lookup_config(c->config_tree, "Address"), &c->hostname))
+ {
+ syslog(LOG_ERR, _("No address specified for %s"), c->name);
+ free_connection(c);
+ return -1;
+ }
- if(setup_outgoing_meta_socket(ncn) < 0)
+ if(!get_config_port(lookup_config(c->config_tree, "Port"), &c->port))
{
- syslog(LOG_ERR, "Could not set up a meta connection.");
- free_conn_element(ncn);
+ syslog(LOG_ERR, _("No port specified for %s"), c->name);
+ free_connection(c);
return -1;
}
- ncn->status.meta = 1;
- ncn->status.outgoing = 1;
- ncn->next = conn_list;
- conn_list = ncn;
+ if(!(h = gethostbyname(c->hostname)))
+ {
+ syslog(LOG_ERR, _("Error looking up `%s': %m"), c->hostname);
+ free_connection(c);
+ return -1;
+ }
+
+ 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 (%s)"),
+ c->name, c->hostname);
+ free_connection(c);
+ return -1;
+ }
+
+ c->status.outgoing = 1;
+ c->last_ping_time = time(NULL);
+
+ connection_add(c);
+
+ send_id(c);
cp
return 0;
}
-/*
- set up the local sockets (listen only)
-*/
-int setup_myself(void)
+int read_rsa_public_key(connection_t *c)
{
- config_t const *cfg;
+ FILE *fp;
+ char *fname;
+ char *key;
+ void *result;
cp
- myself = new_conn_list();
+ if(!c->rsa_key)
+ c->rsa_key = RSA_new();
+
+ /* First, check for simple PublicKey statement */
- if(!(cfg = get_config_val(myvpnip)))
+ if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &key))
{
- syslog(LOG_ERR, "No value for my VPN IP given");
- return -1;
+ BN_hex2bn(&c->rsa_key->n, key);
+ BN_hex2bn(&c->rsa_key->e, "FFFF");
+ return 0;
}
- myself->vpn_ip = cfg->data.ip->ip;
- myself->vpn_mask = cfg->data.ip->mask;
+ /* Else, check for PublicKeyFile statement and read it */
- if(!(cfg = get_config_val(listenport)))
- myself->port = 655;
- else
- myself->port = cfg->data.val;
+ if(get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
+ {
+ if(is_safe_path(fname))
+ {
+ if((fp = fopen(fname, "r")) == NULL)
+ {
+ syslog(LOG_ERR, _("Error reading RSA public key file `%s': %m"),
+ fname);
+ return -1;
+ }
+ result = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
+ fclose(fp);
+ if(!result)
+ {
+ syslog(LOG_ERR, _("Reading RSA public key file `%s' failed: %m"),
+ fname);
+ return -1;
+ }
+ return 0;
+ }
+ else
+ return -1;
+ }
+
+ /* Else, check if a harnessed public key is in the config file */
+
+ result = NULL;
- if((myself->meta_socket = setup_listen_meta_socket(myself->port)) < 0)
+ asprintf(&fname, "%s/hosts/%s", confbase, c->name);
+ if((fp = fopen(fname, "r")))
{
- syslog(LOG_ERR, "Unable to set up a listening socket");
- return -1;
+ result = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
+ fclose(fp);
+ free(fname);
}
- if((myself->socket = setup_vpn_in_socket(myself->port)) < 0)
+ free(fname);
+
+ if(result)
+ return 0;
+ else
{
- syslog(LOG_ERR, "Unable to set up an incoming vpn data socket");
- close(myself->meta_socket);
+ syslog(LOG_ERR, _("No public key for %s specified!"), c->name);
return -1;
}
+}
- myself->status.active = 1;
+int read_rsa_private_key(void)
+{
+ FILE *fp;
+ void *result;
+ char *fname, *key;
+cp
+ if(!myself->connection->rsa_key)
+ myself->connection->rsa_key = RSA_new();
- syslog(LOG_NOTICE, "Ready: listening on port %d.", myself->port);
+ if(get_config_string(lookup_config(config_tree, "PrivateKey"), &key))
+ {
+ BN_hex2bn(&myself->connection->rsa_key->d, key);
+ BN_hex2bn(&myself->connection->rsa_key->e, "FFFF");
+ }
+ else if(get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
+ {
+ if((fp = fopen(fname, "r")) == NULL)
+ {
+ syslog(LOG_ERR, _("Error reading RSA private key file `%s': %m"),
+ fname);
+ return -1;
+ }
+ result = PEM_read_RSAPrivateKey(fp, &myself->connection->rsa_key, NULL, NULL);
+ fclose(fp);
+ if(!result)
+ {
+ syslog(LOG_ERR, _("Reading RSA private key file `%s' failed: %m"),
+ fname);
+ return -1;
+ }
+ }
+ else
+ {
+ syslog(LOG_ERR, _("No private key for tinc daemon specified!"));
+ return -1;
+ }
cp
return 0;
}
/*
- setup all initial network connections
+ Configure node_t myself and set up the local sockets (listen only)
*/
-int setup_network_connections(void)
+int setup_myself(void)
{
- config_t const *cfg;
+ config_t *cfg;
+ subnet_t *subnet;
+ char *name, *mode;
+ int choice;
cp
- if((cfg = get_config_val(pingtimeout)) == NULL)
- timeout = 10;
- else
- timeout = cfg->data.val;
+ myself = new_node();
+ myself->connection = new_connection();
- if(setup_tap_fd() < 0)
- return -1;
+ asprintf(&myself->hostname, _("MYSELF"));
+ asprintf(&myself->connection->hostname, _("MYSELF"));
- if(setup_myself() < 0)
+ 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, _("Name for tinc daemon required!"));
+ return -1;
+ }
+
+ if(check_id(name))
+ {
+ syslog(LOG_ERR, _("Invalid name for myself!"));
+ free(name);
+ return -1;
+ }
+
+ myself->name = name;
+ myself->connection->name = xstrdup(name);
+
+cp
+ if(read_rsa_private_key())
return -1;
- if((cfg = get_config_val(upstreamip)) == NULL)
- /* No upstream IP given, we're listen only. */
- return 0;
+ if(read_connection_config(myself->connection))
+ {
+ syslog(LOG_ERR, _("Cannot open host configuration file for myself!"));
+ return -1;
+ }
- if(setup_outgoing_connection(cfg->data.ip->ip))
+ if(read_rsa_public_key(myself->connection))
return -1;
cp
- return 0;
-}
-RETSIGTYPE
-sigalrm_handler(int a)
-{
- config_t const *cfg;
- static int seconds_till_retry;
+/*
+ if(RSA_check_key(rsa_key) != 1)
+ {
+ syslog(LOG_ERR, _("Invalid public/private keypair!"));
+ return -1;
+ }
+*/
+ if(!get_config_port(lookup_config(myself->connection->config_tree, "Port"), &myself->connection->port))
+ myself->port = 655;
+
+/* Read in all the subnets specified in the host configuration file */
+
+ 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
- cfg = get_config_val(upstreamip);
+ /* 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(!setup_outgoing_connection(cfg->data.ip->ip))
+ 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(myself->connection->config_tree, "Mode"), &mode))
{
- signal(SIGALRM, SIG_IGN);
- seconds_till_retry = 5;
+ 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, _("Invalid routing mode!"));
+ return -1;
+ }
}
else
+ routing_mode = RMODE_ROUTER;
+
+cp
+ /* Open sockets */
+
+ if((tcp_socket = setup_listen_socket(myself->port)) < 0)
{
- signal(SIGALRM, sigalrm_handler);
- seconds_till_retry += 5;
- alarm(seconds_till_retry);
- syslog(LOG_ERR, "Still failed to connect to other. Will retry in %d seconds.",
- seconds_till_retry);
+ syslog(LOG_ERR, _("Unable to set up a listening TCP socket!"));
+ return -1;
+ }
+
+ if((udp_socket = setup_vpn_in_socket(myself->port)) < 0)
+ {
+ syslog(LOG_ERR, _("Unable to set up a listening UDP socket!"));
+ return -1;
}
cp
+ /* Generate packet encryption key */
+
+ myself->cipher = EVP_bf_cbc();
+
+ myself->keylength = myself->cipher->key_len + myself->cipher->iv_len;
+
+ myself->key = (char *)xmalloc(myself->keylength);
+ RAND_pseudo_bytes(myself->key, myself->keylength);
+
+ if(!get_config_int(lookup_config(myself->connection->config_tree, "KeyExpire"), &keylifetime))
+ keylifetime = 3600;
+
+ keyexpires = time(NULL) + keylifetime;
+cp
+ /* Done */
+
+ myself->nexthop = myself;
+ myself->via = myself;
+ myself->status.active = 1;
+ node_add(myself);
+
+ syslog(LOG_NOTICE, _("Ready: listening on port %hd"), myself->port);
+cp
+ return 0;
}
/*
- close all open network connections
+ setup all initial network connections
*/
-void close_network_connections(void)
+int setup_network_connections(void)
{
- conn_list_t *p;
cp
- for(p = conn_list; p != NULL; p = p->next)
+ init_connections();
+ init_subnets();
+
+ if(get_config_int(lookup_config(myself->connection->config_tree, "PingTimeout"), &timeout))
{
- if(p->status.dataopen)
- {
- shutdown(p->socket, 0); /* No more receptions */
- close(p->socket);
- }
- if(p->status.meta)
- {
- send_termreq(p);
- shutdown(p->meta_socket, 0); /* No more receptions */
- close(p->meta_socket);
+ if(timeout < 1)
+ {
+ timeout = 86400;
}
}
+ else
+ timeout = 60;
- if(myself)
- if(myself->status.active)
- {
- close(myself->meta_socket);
- close(myself->socket);
- }
+ if(setup_device() < 0)
+ return -1;
- close(tap_fd);
- destroy_conn_list();
+ /* Run tinc-up script to further initialize the tap interface */
+ execute_script("tinc-up");
+
+ if(setup_myself() < 0)
+ return -1;
- syslog(LOG_NOTICE, "Terminating.");
+ signal(SIGALRM, try_outgoing_connections);
+ alarm(5);
cp
- return;
+ return 0;
}
/*
- create a data (udp) socket
+ close all open network connections
*/
-int setup_vpn_connection(conn_list_t *cl)
+void close_network_connections(void)
{
- int nfd, flags;
- struct sockaddr_in a;
+ avl_node_t *node, *next;
+ connection_t *c;
cp
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, "Opening UDP socket to " IP_ADDR_S, IP_ADDR_V(cl->real_ip));
-
- nfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
- if(nfd == -1)
+ for(node = connection_tree->head; node; node = next)
{
- syslog(LOG_ERR, "Creating data socket failed: %m");
- return -1;
+ next = node->next;
+ c = (connection_t *)node->data;
+ c->status.outgoing = 0;
+ terminate_connection(c, 0);
}
- a.sin_family = AF_INET;
- a.sin_port = htons(cl->port);
- a.sin_addr.s_addr = htonl(cl->real_ip);
+// terminate_connection(myself, 0);
- if(connect(nfd, (struct sockaddr *)&a, sizeof(a)) == -1)
- {
- syslog(LOG_ERR, "Create connection to %08lx:%d failed: %m", ntohs(cl->real_ip),
- cl->port);
- return -1;
- }
+// destroy_trees();
- flags = fcntl(nfd, F_GETFL);
- if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0)
- {
- syslog(LOG_ERR, "This is a bug: %s:%d: %d:%m", __FILE__, __LINE__, nfd);
- return -1;
- }
+ execute_script("tinc-down");
- cl->socket = nfd;
- cl->status.dataopen = 1;
+ close_device();
cp
- return 0;
+ return;
}
/*
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, "Error: getpeername: %m");
+ syslog(LOG_ERR, _("System call `%s' failed: %m"),
+ "getpeername");
+ close(sfd);
return NULL;
}
- p->hostname = hostlookup(ci.sin_addr.s_addr);
- p->real_ip = ntohl(ci.sin_addr.s_addr);
- p->meta_socket = sfd;
- p->status.meta = 1;
- p->buflen = 0;
-
- syslog(LOG_NOTICE, "Connection from %s:%d", p->hostname, htons(ci.sin_port));
+ c->address = ntohl(ci.sin_addr.s_addr);
+ c->hostname = hostlookup(ci.sin_addr.s_addr);
+ c->port = htons(ci.sin_port); /* This one will be overwritten later */
+ c->socket = sfd;
+ c->last_ping_time = time(NULL);
- if(send_basic_info(p) < 0)
- {
- free(p);
- return NULL;
- }
+ if(debug_lvl >= DEBUG_CONNECTIONS)
+ syslog(LOG_NOTICE, _("Connection from %s port %d"),
+ c->hostname, htons(ci.sin_port));
+
+ 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(conn_list_t *cl)
+void handle_incoming_vpn_data(void)
{
- real_packet_t rp;
- int lenin;
+ vpn_packet_t pkt;
int x, l = sizeof(x);
- conn_list_t *f;
+ struct sockaddr_in from;
+ socklen_t fromlen = sizeof(from);
+ node_t *n;
cp
- if(getsockopt(cl->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__, cl->socket);
- return -1;
+ syslog(LOG_ERR, _("This is a bug: %s:%d: %d:%m"),
+ __FILE__, __LINE__, udp_socket);
+ return;
}
if(x)
{
- syslog(LOG_ERR, "Incoming data socket error: %s", sys_errlist[x]);
- return -1;
+ syslog(LOG_ERR, _("Incoming data socket error: %s"), strerror(x));
+ return;
}
- rp.len = -1;
- lenin = recvfrom(cl->socket, &rp, MTU, 0, NULL, NULL);
- if(lenin <= 0)
+ if((pkt.len = recvfrom(udp_socket, (char *) pkt.salt, MTU, 0, (struct sockaddr *)&from, &fromlen)) <= 0)
{
- syslog(LOG_ERR, "Receiving data failed: %m");
- return -1;
+ syslog(LOG_ERR, _("Receiving packet failed: %m"));
+ return;
}
- total_socket_in += lenin;
- rp.data.len = ntohs(rp.data.len);
- rp.len = ntohs(rp.len);
- rp.from = ntohl(rp.from);
+ n = lookup_node_udp(ntohl(from.sin_addr.s_addr), ntohs(from.sin_port));
- if(rp.len >= 0)
+ if(!n)
{
- f = lookup_conn(rp.from);
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, "packet from " IP_ADDR_S " (len %d)",
- IP_ADDR_V(rp.from), rp.len);
- if(!f)
- {
- syslog(LOG_ERR, "Got packet from unknown source " IP_ADDR_S,
- IP_ADDR_V(rp.from));
- return -1;
- }
-
- if(f->status.validkey)
- xrecv(f, &rp);
- else
- {
- add_queue(&(f->rq), &rp, rp.len);
- if(!cl->status.waitingforkey)
- send_key_request(rp.from);
- }
-
- if(my_key_expiry <= time(NULL))
- regenerate_keys();
+ syslog(LOG_WARNING, _("Received UDP packets on port %hd from unknown source %x:%hd"), myself->port, ntohl(from.sin_addr.s_addr), ntohs(from.sin_port));
+ return;
}
-cp
- return 0;
-}
-
/*
- terminate a connection and notify the other
- end before closing the sockets
+ if(n->connection)
+ n->connection->last_ping_time = time(NULL);
*/
-void terminate_connection(conn_list_t *cl)
-{
-cp
- if(cl->status.remove)
- return;
-
- if(debug_lvl > 0)
- syslog(LOG_NOTICE, "Closing connection with %s.", cl->hostname);
-
- if(cl->status.timeout)
- send_timeout(cl);
- else if(!cl->status.termreq)
- send_termreq(cl);
-
- close(cl->socket);
- if(cl->status.meta)
- close(cl->meta_socket);
-
- if(cl->status.outgoing)
- {
- alarm(5);
- signal(SIGALRM, sigalrm_handler);
- syslog(LOG_NOTICE, "Try to re-establish outgoing connection in 5 seconds.");
- }
-
- cl->status.remove = 1;
+ receive_udppacket(n, &pkt);
cp
}
/*
- send out a ping request to all active
- connections
+ Terminate a connection:
+ - Close the sockets
+ - Remove associated hosts and subnets
+ - Deactivate the host
+ - Since it might still be referenced, put it on the prune list.
+ - If report == 1, then send DEL_HOST messages to the other tinc daemons.
*/
-int send_broadcast_ping(void)
+void terminate_connection(connection_t *c, int report)
{
- conn_list_t *p;
-cp
- for(p = conn_list; p != NULL; p = p->next)
- {
- if(p->status.remove)
- continue;
- if(p->status.active && p->status.meta)
- {
- if(send_ping(p))
- terminate_connection(p);
- else
- {
- p->status.pinged = 1;
- p->status.got_pong = 0;
- }
- }
- }
-
- last_ping_time = time(NULL);
-cp
- return 0;
+ /* Needs a serious rewrite. */
}
/*
- end all connections that did not respond
- to the ping probe in time
+ Check if the other end is active.
+ If we have sent packets, but didn't receive any,
+ then possibly the other end is dead. We send a
+ PING request over the meta connection. If the other
+ end does not reply in time, we consider them dead
+ and close the connection.
*/
-int check_dead_connections(void)
+void check_dead_connections(void)
{
- conn_list_t *p;
+ time_t now;
+ avl_node_t *node, *next;
+ connection_t *c;
cp
- for(p = conn_list; p != NULL; p = p->next)
+ now = time(NULL);
+
+ for(node = connection_tree->head; node; node = next)
{
- if(p->status.remove)
- continue;
- if(p->status.active && p->status.meta && p->status.pinged && !p->status.got_pong)
- {
- syslog(LOG_INFO, "%s (" IP_ADDR_S ") didn't respond to ping",
- p->hostname, IP_ADDR_V(p->vpn_ip));
- p->status.timeout = 1;
- terminate_connection(p);
- }
+ next = node->next;
+ c = (connection_t *)node->data;
+ if(c->last_ping_time + timeout < now)
+ {
+ if(c->status.active)
+ {
+ if(c->status.pinged)
+ {
+ if(debug_lvl >= DEBUG_PROTOCOL)
+ syslog(LOG_INFO, _("%s (%s) didn't respond to PING"),
+ c->name, c->hostname);
+ c->status.timeout = 1;
+ terminate_connection(c, 1);
+ }
+ else
+ {
+ 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;
}
/*
accept a new tcp connect and create a
new connection
*/
-int handle_new_meta_connection(conn_list_t *cl)
+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(cl->meta_socket, &client, &len)) < 0)
+ if((fd = accept(tcp_socket, &client, &len)) < 0)
{
- syslog(LOG_ERR, "Accepting a new connection failed: %m");
+ syslog(LOG_ERR, _("Accepting a new connection failed: %m"));
return -1;
}
- if((ncn = create_new_connection(nfd)) == NULL)
+ if(!(new = create_new_connection(fd)))
{
- shutdown(nfd, 2);
- close(nfd);
- syslog(LOG_NOTICE, "Closed attempted connection.");
+ shutdown(fd, 2);
+ close(fd);
+ syslog(LOG_NOTICE, _("Closed attempted connection"));
return 0;
}
- ncn->status.meta = 1;
- ncn->next = conn_list;
- conn_list = ncn;
+ connection_add(new);
+
+ send_id(new);
cp
return 0;
}
-/*
- dispatch any incoming meta requests
+void randomized_alarm(int seconds)
+{
+ unsigned char r;
+ RAND_pseudo_bytes(&r, 1);
+ alarm((seconds * (int)r) / 128 + 1);
+}
+
+/* This function is severely fucked up.
+ We want to redesign it so the following rules apply:
+
+ - Try all ConnectTo's in a row:
+ - if a connect() fails, try next one immediately,
+ - if it works, wait 5 seconds or so.
+ - If none of them were succesful, increase delay and retry.
+ - If all were succesful, don't try anymore.
*/
-int handle_incoming_meta_data(conn_list_t *cl)
+
+RETSIGTYPE
+try_outgoing_connections(int a)
{
- int x, l = sizeof(x);
- int request, oldlen, i;
- int lenin = 0;
+ static config_t *cfg = NULL;
+ static int retry = 0;
+ char *name;
+ int maxtimeout = 900;
cp
- if(getsockopt(cl->meta_socket, SOL_SOCKET, SO_ERROR, &x, &l) < 0)
- {
- syslog(LOG_ERR, "This is a bug: %s:%d: %d:%m", __FILE__, __LINE__, cl->meta_socket);
- return -1;
- }
- if(x)
- {
- syslog(LOG_ERR, "Metadata socket error: %s", sys_errlist[x]);
- return -1;
- }
+ if(!cfg)
+ cfg = lookup_config(config_tree, "ConnectTo");
+
+ if(!cfg)
+ return;
- if(cl->buflen >= MAXBUFSIZE)
+ while(cfg)
{
- syslog(LOG_ERR, "Metadata read buffer full! Discarding contents.");
- cl->buflen = 0;
- }
+ get_config_string(cfg, &name);
+ cfg = lookup_config_next(config_tree, cfg); /* Next time skip to next ConnectTo line */
- lenin = read(cl->meta_socket, cl->buffer, MAXBUFSIZE-cl->buflen);
+ if(!setup_outgoing_connection(name)) /* function returns 0 when there are no problems */
+ retry = 1;
- if(lenin<=0)
- {
- syslog(LOG_ERR, "Metadata socket read error: %m");
- return -1;
}
- oldlen = cl->buflen;
- cl->buflen += lenin;
+ get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout);
- for(;;)
+ if(retry)
{
- cl->reqlen = 0;
-
- for(i = oldlen; i < cl->buflen; i++)
- {
- if(cl->buffer[i] == '\n')
- {
- cl->buffer[i] = 0; /* replace end-of-line by end-of-string so we can use sscanf */
- cl->reqlen = i + 1;
- break;
- }
- }
-
- if(cl->reqlen)
- {
- if(sscanf(cl->buffer, "%d", &request) == 1)
- {
- if(request_handlers[request] == NULL)
- {
- syslog(LOG_ERR, "Unknown request: %s", cl->buffer);
- return 0;
- }
-
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, "Got request: %s", cl->buffer);
-
- request_handlers[request](cl);
- }
- else
- {
- syslog(LOG_ERR, "Bogus data received: %s", cl->buffer);
- }
+ seconds_till_retry += 5;
+ if(seconds_till_retry > maxtimeout) /* Don't wait more than MAXTIMEOUT seconds. */
+ seconds_till_retry = maxtimeout;
- cl->buflen -= cl->reqlen;
- memmove(cl->buffer, cl->buffer + cl->reqlen, cl->buflen);
- oldlen = 0;
- }
- else
- {
- break;
- }
+ syslog(LOG_ERR, _("Failed to setup all outgoing connections, will retry in %d seconds"),
+ seconds_till_retry);
+
+ /* Randomize timeout to avoid global synchronisation effects */
+ randomized_alarm(seconds_till_retry);
}
-cp
- return 0;
+ else
+ {
+ seconds_till_retry = 5;
+ }
+cp
}
/*
*/
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(p->status.remove)
- continue;
+ if(FD_ISSET(udp_socket, f))
+ handle_incoming_vpn_data();
- if(p->status.dataopen)
- if(FD_ISSET(p->socket, f))
- {
- /*
- The only thing that can happen to get us here is apparently an
- error on this outgoing(!) UDP socket that isn't immediate (i.e.
- something that will not trigger an error directly on send()).
- I've once got here when it said `No route to host'.
- */
- getsockopt(p->socket, SOL_SOCKET, SO_ERROR, &x, &l);
- syslog(LOG_ERR, "Outgoing data socket error: %s", sys_errlist[x]);
- terminate_connection(p);
- return;
- }
-
- if(p->status.meta)
- if(FD_ISSET(p->meta_socket, f))
- if(handle_incoming_meta_data(p) < 0)
- {
- terminate_connection(p);
- return;
- }
- }
-
- if(FD_ISSET(myself->socket, f))
- handle_incoming_vpn_data(myself);
-
- if(FD_ISSET(myself->meta_socket, f))
- handle_new_meta_connection(myself);
-cp
-}
-
-/*
- 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)
+ for(node = connection_tree->head; node; node = node->next)
{
- syslog(LOG_ERR, "Error while reading from tapdevice: %m");
- return;
- }
+ c = (connection_t *)node->data;
- total_tap_in += lenin;
+ if(c->status.remove)
+ return;
- ether_type = ntohs(*((unsigned short*)(&vp.data[12])));
- if(ether_type != 0x0800)
- {
- if(debug_lvl > 0)
- syslog(LOG_INFO, "Non-IP ethernet frame %04x from " MAC_ADDR_S,
- ether_type, MAC_ADDR_V(vp.data[6]));
- return;
- }
-
- if(lenin < 32)
- {
- if(debug_lvl > 0)
- syslog(LOG_INFO, "Dropping short packet");
- return;
+ if(FD_ISSET(c->socket, f))
+ if(receive_meta(c) < 0)
+ {
+ terminate_connection(c, c->status.active);
+ return;
+ }
}
- from = ntohl(*((unsigned long*)(&vp.data[26])));
- to = ntohl(*((unsigned long*)(&vp.data[30])));
-
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, "An IP packet (%04x) for " IP_ADDR_S " from " IP_ADDR_S,
- ether_type, IP_ADDR_V(to), IP_ADDR_V(from));
- if(debug_lvl > 4)
- syslog(LOG_DEBUG, MAC_ADDR_S " to " MAC_ADDR_S,
- MAC_ADDR_V(vp.data[0]), MAC_ADDR_V(vp.data[6]));
-
- vp.len = (length_t)lenin - 2;
-
- strip_mac_addresses(&vp);
-
- send_packet(to, &vp);
+ if(FD_ISSET(tcp_socket, f))
+ handle_new_meta_connection();
cp
}
fd_set fset;
struct timeval tv;
int r;
+ time_t last_ping_check;
+ int t;
cp
- last_ping_time = time(NULL);
+ 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 */
- continue;
- syslog(LOG_ERR, "Error while waiting for input: %m");
- return;
+ if(errno != EINTR) /* because of alarm */
+ {
+ syslog(LOG_ERR, _("Error while waiting for input: %m"));
+ return;
+ }
+ }
+
+ if(sighup)
+ {
+ syslog(LOG_INFO, _("Rereading configuration file and restarting in 5 seconds"));
+ sighup = 0;
+ close_network_connections();
+ exit_configuration(&config_tree);
+
+ if(read_server_config())
+ {
+ syslog(LOG_ERR, _("Unable to reread configuration file, exiting"));
+ exit(1);
+ }
+
+ sleep(5);
+
+ if(setup_network_connections())
+ return;
+
+ continue;
}
- if(r == 0 || last_ping_time + timeout < time(NULL))
- /* Timeout... hm... something might be wrong. */
+ t = time(NULL);
+
+ /* Let's check if everybody is still alive */
+
+ if(last_ping_check + timeout < t)
{
check_dead_connections();
- send_broadcast_ping();
- continue;
+ last_ping_check = time(NULL);
+
+ /* Should we regenerate our key? */
+
+ if(keyexpires < t)
+ {
+ if(debug_lvl >= DEBUG_STATUS)
+ syslog(LOG_INFO, _("Regenerating symmetric key"));
+
+ RAND_pseudo_bytes(myself->key, myself->keylength);
+ send_key_changed(myself->connection, myself);
+ keyexpires = time(NULL) + keylifetime;
+ }
}
- check_network_activity(&fset);
+ if(r > 0)
+ {
+ check_network_activity(&fset);
- /* local tap data */
- if(FD_ISSET(tap_fd, &fset))
- handle_tap_input();
+ /* local tap data */
+ if(FD_ISSET(device_fd, &fset))
+ handle_tap_input();
+ }
}
cp
}