/*
net.c -- most of the network code
- Copyright (C) 1998,1999,2000 Ivo Timmermans <zarq@iname.com>
+ 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
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 1.37 2002/04/09 15:26:00 zarq 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 <signal.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 <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 "graph.h"
+#include "process.h"
+#include "route.h"
+#include "device.h"
+#include "event.h"
-int tap_fd = -1;
-
-int total_tap_in = 0;
-int total_tap_out = 0;
-int total_socket_in = 0;
-int total_socket_out = 0;
-
-/* The global list of existing connections */
-conn_list_t *conn_list = NULL;
-conn_list_t *myself = NULL;
-
-/*
- strip off the MAC adresses of an ethernet frame
-*/
-void strip_mac_addresses(vpn_packet_t *p)
-{
- unsigned char tmp[MAXSIZE];
-cp
- memcpy(tmp, p->data, p->len);
- p->len -= 12;
- memcpy(p->data, &tmp[12], p->len);
-cp
-}
-
-/*
- reassemble MAC addresses
-*/
-void add_mac_addresses(vpn_packet_t *p)
-{
- unsigned char tmp[MAXSIZE];
-cp
- memcpy(&tmp[12], p->data, p->len);
- p->len += 12;
- tmp[0] = tmp[6] = 0xfe;
- tmp[1] = tmp[7] = 0xfd;
- *((ip_t*)(&tmp[2])) = (ip_t)(htonl(myself->vpn_ip));
- *((ip_t*)(&tmp[8])) = *((ip_t*)(&tmp[26]));
- memcpy(p->data, &tmp[0], p->len);
-cp
-}
-
-int xsend(conn_list_t *cl, void *packet)
-{
- int r;
- real_packet_t rp;
-cp
- do_encrypt((vpn_packet_t*)packet, &rp, cl->key);
- rp.from = htonl(myself->vpn_ip);
- rp.data.len = htons(rp.data.len);
- rp.len = htons(rp.len);
-
- if(debug_lvl > 3)
- syslog(LOG_ERR, "Sent %d bytes to %lx", ntohs(rp.len), cl->vpn_ip);
+#include "system.h"
- if((r = send(cl->socket, (char*)&rp, ntohs(rp.len), 0)) < 0)
- {
- syslog(LOG_ERR, "Error sending data: %m");
- return -1;
- }
+int do_purge = 0;
+int sighup = 0;
+int sigalrm = 0;
- total_socket_out += r;
+time_t now = 0;
- cl->want_ping = 1;
-cp
- return 0;
-}
+/* Purge edges and subnets of unreachable nodes. Use carefully. */
-int xrecv(conn_list_t *cl, void *packet)
+void purge(void)
{
- vpn_packet_t vp;
- int lenin;
+ avl_node_t *nnode, *nnext, *enode, *enext, *snode, *snext, *cnode;
+ node_t *n;
+ edge_t *e;
+ subnet_t *s;
+ connection_t *c;
cp
- do_decrypt((real_packet_t*)packet, &vp, cl->key);
- add_mac_addresses(&vp);
+ if(debug_lvl >= DEBUG_PROTOCOL)
+ syslog(LOG_DEBUG, _("Purging unreachable nodes"));
- 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;
+ for(nnode = node_tree->head; nnode; nnode = nnext)
+ {
+ nnext = nnode->next;
+ n = (node_t *)nnode->data;
- cl->want_ping = 0;
- cl->last_ping_time = time(NULL);
-cp
- return 0;
-}
-
-/*
- add the given packet of size s to the
- queue q, be it the send or receive queue
-*/
-void add_queue(packet_queue_t **q, void *packet, size_t s)
-{
- queue_element_t *e;
-cp
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, "packet to queue: %d", s);
-
- e = xmalloc(sizeof(*e));
- e->packet = xmalloc(s);
- memcpy(e->packet, packet, s);
-
- if(!*q)
- {
- *q = xmalloc(sizeof(**q));
- (*q)->head = (*q)->tail = NULL;
- }
-
- e->next = NULL; /* We insert at the tail */
-
- if((*q)->tail) /* Do we have a tail? */
+ if(!n->status.reachable)
{
- (*q)->tail->next = e;
- e->prev = (*q)->tail;
- }
- else /* No tail -> no head too */
- {
- (*q)->head = e;
- e->prev = NULL;
- }
-
- (*q)->tail = e;
-cp
-}
+ if(debug_lvl >= DEBUG_SCARY_THINGS)
+ syslog(LOG_DEBUG, _("Purging node %s (%s)"), n->name, n->hostname);
-/* Remove a queue element */
-void del_queue(packet_queue_t **q, queue_element_t *e)
-{
-cp
- free(e->packet);
+ for(snode = n->subnet_tree->head; snode; snode = snext)
+ {
+ snext = snode->next;
+ s = (subnet_t *)snode->data;
- if(e->next) /* There is a successor, so we are not tail */
- {
- if(e->prev) /* There is a predecessor, so we are not head */
+ for(cnode = connection_tree->head; cnode; cnode = cnode->next)
{
- e->next->prev = e->prev;
- e->prev->next = e->next;
+ c = (connection_t *)cnode->data;
+ if(c->status.active)
+ send_del_subnet(c, s);
}
- else /* We are head */
- {
- e->next->prev = NULL;
- (*q)->head = e->next;
- }
- }
- else /* We are tail (or all alone!) */
- {
- if(e->prev) /* We are not alone :) */
- {
- e->prev->next = NULL;
- (*q)->tail = e->prev;
- }
- else /* Adieu */
- {
- free(*q);
- *q = NULL;
- }
- }
-
- free(e);
-cp
-}
-
-/*
- flush a queue by calling function for
- each packet, and removing it when that
- returned a zero exit code
-*/
-void flush_queue(conn_list_t *cl, packet_queue_t **pq,
- int (*function)(conn_list_t*,void*))
-{
- queue_element_t *p, *next = NULL;
-cp
- for(p = (*pq)->head; p != NULL; )
- {
- next = p->next;
-
- if(!function(cl, p->packet))
- del_queue(pq, p);
-
- p = next;
- }
-
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, "queue flushed");
-cp
-}
-/*
- 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);
- }
+ subnet_del(n, s);
+ }
- if(cl->rq)
- {
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, "Flushing receive queue for " IP_ADDR_S,
- IP_ADDR_V(cl->vpn_ip));
- flush_queue(cl, &(cl->rq), xrecv);
- }
-cp
-}
+ for(enode = n->edge_tree->head; enode; enode = enext)
+ {
+ enext = enode->next;
+ e = (edge_t *)enode->data;
-/*
- send a packet to the given vpn ip.
-*/
-int send_packet(ip_t to, vpn_packet_t *packet)
-{
- conn_list_t *cl;
-cp
- if((cl = lookup_conn(to)) == NULL)
- {
- if(debug_lvl > 2)
+ for(cnode = connection_tree->head; cnode; cnode = cnode->next)
{
- 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;
+ c = (connection_t *)cnode->data;
+ if(c->status.active)
+ send_del_edge(c, e);
}
- }
-
- if(my_key_expiry <= time(NULL))
- regenerate_keys();
-
- if(!cl->status.dataopen)
- if(setup_vpn_connection(cl) < 0)
- return -1;
-
- if(!cl->status.validkey)
- {
- add_queue(&(cl->sq), packet, packet->len + 2);
- if(!cl->status.waitingforkey)
- send_key_request(cl->vpn_ip); /* Keys should be sent to the host running the tincd */
- return 0;
- }
- if(!cl->status.active)
- {
- add_queue(&(cl->sq), packet, packet->len + 2);
- if(debug_lvl > 1)
- syslog(LOG_INFO, IP_ADDR_S " is not ready, queueing packet.", IP_ADDR_V(cl->vpn_ip));
- return 0; /* We don't want to mess up, do we? */
- }
-
- /* can we send it? can we? can we? huh? */
-cp
- return xsend(cl, packet);
-}
-
-/*
- open the local ethertap device
-*/
-int setup_tap_fd(void)
-{
- int nfd;
- const char *tapfname;
- config_t const *cfg;
-cp
- if((cfg = get_config_val(tapdevice)) == NULL)
- tapfname = "/dev/tap0";
- else
- tapfname = cfg->data.ptr;
-
- if((nfd = open(tapfname, O_RDWR | O_NONBLOCK)) < 0)
- {
- syslog(LOG_ERR, "Could not open %s: %m", tapfname);
- return -1;
- }
-
- tap_fd = nfd;
-cp
- return 0;
-}
-
-/*
- set up the socket that we listen on for incoming
- (tcp) connections
-*/
-int setup_listen_meta_socket(int port)
-{
- int nfd, flags;
- struct sockaddr_in a;
- const int one = 1;
-cp
- if((nfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
- {
- syslog(LOG_ERR, "Creating metasocket failed: %m");
- return -1;
- }
-
- if(setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)))
- {
- syslog(LOG_ERR, "setsockopt: %m");
- return -1;
- }
-
- flags = fcntl(nfd, F_GETFL);
- if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0)
- {
- syslog(LOG_ERR, "fcntl: %m");
- return -1;
- }
-
- memset(&a, 0, sizeof(a));
- a.sin_family = AF_INET;
- a.sin_port = htons(port);
- a.sin_addr.s_addr = htonl(INADDR_ANY);
-
- if(bind(nfd, (struct sockaddr *)&a, sizeof(struct sockaddr)))
- {
- syslog(LOG_ERR, "Can't bind to port %hd/tcp: %m", port);
- return -1;
- }
-
- if(listen(nfd, 3))
- {
- syslog(LOG_ERR, "listen: %m");
- return -1;
- }
-cp
- return nfd;
-}
-
-/*
- setup the socket for incoming encrypted
- data (the udp part)
-*/
-int setup_vpn_in_socket(int port)
-{
- int nfd, flags;
- struct sockaddr_in a;
- const int one = 1;
-cp
- if((nfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
- {
- syslog(LOG_ERR, "Creating socket failed: %m");
- return -1;
- }
-
- if(setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)))
- {
- syslog(LOG_ERR, "setsockopt: %m");
- return -1;
- }
-
- flags = fcntl(nfd, F_GETFL);
- if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0)
- {
- syslog(LOG_ERR, "fcntl: %m");
- return -1;
- }
-
- memset(&a, 0, sizeof(a));
- a.sin_family = AF_INET;
- a.sin_port = htons(port);
- a.sin_addr.s_addr = htonl(INADDR_ANY);
-
- if(bind(nfd, (struct sockaddr *)&a, sizeof(struct sockaddr)))
- {
- syslog(LOG_ERR, "Can't bind to port %hd/udp: %m", port);
- return -1;
- }
-cp
- return nfd;
-}
-
-/*
- setup an outgoing meta (tcp) socket
-*/
-int setup_outgoing_meta_socket(conn_list_t *cl)
-{
- int flags;
- struct sockaddr_in a;
- config_t const *cfg;
-cp
- if((cfg = get_config_val(upstreamport)) == NULL)
- cl->port = 655;
- else
- cl->port = cfg->data.val;
-
- cl->meta_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
- if(cl->meta_socket == -1)
- {
- syslog(LOG_ERR, "Creating socket failed: %m");
- return -1;
- }
-
- a.sin_family = AF_INET;
- a.sin_port = htons(cl->port);
- a.sin_addr.s_addr = htonl(cl->real_ip);
-
- if(connect(cl->meta_socket, (struct sockaddr *)&a, sizeof(a)) == -1)
- {
- syslog(LOG_ERR, IP_ADDR_S ":%d: %m", IP_ADDR_V(cl->real_ip), cl->port);
- return -1;
- }
+ edge_del(e);
+ }
- flags = fcntl(cl->meta_socket, F_GETFL);
- if(fcntl(cl->meta_socket, F_SETFL, flags | O_NONBLOCK) < 0)
- {
- syslog(LOG_ERR, "fcntl: %m");
- return -1;
+ node_del(n);
}
-
- cl->hostname = hostlookup(htonl(cl->real_ip));
-
- syslog(LOG_INFO, "Connected to %s:%hd" , cl->hostname, cl->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.
+ put all file descriptors in an fd_set array
+ While we're at it, purge stuff that needs to be removed.
*/
-int setup_outgoing_connection(ip_t ip)
+void build_fdset(fd_set *fs)
{
- conn_list_t *ncn;
+ avl_node_t *node, *next;
+ connection_t *c;
+ int i;
cp
- ncn = new_conn_list();
- ncn->real_ip = ip;
+ FD_ZERO(fs);
- if(setup_outgoing_meta_socket(ncn) < 0)
+ for(node = connection_tree->head; node; node = next)
{
- syslog(LOG_ERR, "Could not set up a meta connection.");
- free_conn_element(ncn);
- return -1;
- }
+ next = node->next;
+ c = (connection_t *)node->data;
- ncn->status.meta = 1;
- ncn->status.outgoing = 1;
- ncn->next = conn_list;
- conn_list = ncn;
-cp
- return 0;
-}
-
-/*
- set up the local sockets (listen only)
-*/
-int setup_myself(void)
-{
- config_t const *cfg;
-cp
- myself = new_conn_list();
-
- if(!(cfg = get_config_val(myvpnip)))
- {
- syslog(LOG_ERR, "No value for my VPN IP given");
- return -1;
+ if(c->status.remove)
+ connection_del(c);
+ else
+ FD_SET(c->socket, fs);
}
- myself->vpn_ip = cfg->data.ip->ip;
- myself->vpn_mask = cfg->data.ip->mask;
-
- if(!(cfg = get_config_val(listenport)))
- myself->port = 655;
- else
- myself->port = cfg->data.val;
-
- if((myself->meta_socket = setup_listen_meta_socket(myself->port)) < 0)
- {
- syslog(LOG_ERR, "Unable to set up a listening socket");
- return -1;
- }
+ if(!connection_tree->head)
+ purge();
- if((myself->socket = setup_vpn_in_socket(myself->port)) < 0)
+ for(i = 0; i < listen_sockets; i++)
{
- syslog(LOG_ERR, "Unable to set up an incoming vpn data socket");
- close(myself->meta_socket);
- return -1;
+ FD_SET(listen_socket[i].tcp, fs);
+ FD_SET(listen_socket[i].udp, fs);
}
- myself->status.active = 1;
-
- syslog(LOG_NOTICE, "Ready: listening on port %d.", myself->port);
+ FD_SET(device_fd, fs);
cp
- return 0;
}
/*
- setup all initial network connections
+ 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
*/
-int setup_network_connections(void)
+void terminate_connection(connection_t *c, int report)
{
- config_t const *cfg;
+ avl_node_t *node;
+ connection_t *other;
cp
- if((cfg = get_config_val(pingtimeout)) == NULL)
- timeout = 5;
- else
- timeout = cfg->data.val;
-
- if(setup_tap_fd() < 0)
- return -1;
+ if(c->status.remove)
+ return;
- if(setup_myself() < 0)
- return -1;
+ if(debug_lvl >= DEBUG_CONNECTIONS)
+ syslog(LOG_NOTICE, _("Closing connection with %s (%s)"),
+ c->name, c->hostname);
- if((cfg = get_config_val(upstreamip)) == NULL)
- /* No upstream IP given, we're listen only. */
- return 0;
+ c->status.remove = 1;
+ c->status.active = 0;
- if(setup_outgoing_connection(cfg->data.ip->ip))
- return -1;
-cp
- return 0;
-}
+ if(c->node)
+ c->node->connection = NULL;
-RETSIGTYPE
-sigalrm_handler(int a)
-{
- config_t const *cfg;
- static int seconds_till_retry;
-cp
- cfg = get_config_val(upstreamip);
+ if(c->socket)
+ close(c->socket);
- if(!setup_outgoing_connection(cfg->data.ip->ip))
+ if(c->edge)
{
- signal(SIGALRM, SIG_IGN);
- seconds_till_retry = 5;
- }
- else
- {
- signal(SIGALRM, sigalrm_handler);
- seconds_till_retry += 5;
- alarm(seconds_till_retry);
- syslog(LOG_ERR, "Still failed to connect to other. Will retry in %d seconds.",
- seconds_till_retry);
- }
-cp
-}
-
-/*
- close all open network connections
-*/
-void close_network_connections(void)
-{
- conn_list_t *p;
-cp
- for(p = conn_list; p != NULL; p = p->next)
- {
- if(p->status.dataopen)
- {
- shutdown(p->socket, 0); /* No more receptions */
- close(p->socket);
- }
- if(p->status.meta)
- {
- send_termreq(p);
- shutdown(p->meta_socket, 0); /* No more receptions */
- close(p->meta_socket);
+ 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);
+ }
}
- }
-
- if(myself)
- if(myself->status.active)
- {
- close(myself->meta_socket);
- close(myself->socket);
- }
-
- close(tap_fd);
- destroy_conn_list();
-
- syslog(LOG_NOTICE, "Terminating.");
-cp
- return;
-}
-
-/*
- create a data (udp) socket
-*/
-int setup_vpn_connection(conn_list_t *cl)
-{
- int nfd, flags;
- struct sockaddr_in a;
-cp
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, "Opening UDP socket to " IP_ADDR_S, IP_ADDR_V(cl->real_ip));
-
- nfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
- if(nfd == -1)
- {
- syslog(LOG_ERR, "Creating data socket failed: %m");
- return -1;
- }
- a.sin_family = AF_INET;
- a.sin_port = htons(cl->port);
- a.sin_addr.s_addr = htonl(cl->real_ip);
+ edge_del(c->edge);
- if(connect(nfd, (struct sockaddr *)&a, sizeof(a)) == -1)
- {
- syslog(LOG_ERR, "Connecting to " IP_ADDR_S ":%d failed: %m",
- IP_ADDR_V(cl->real_ip), cl->port);
- return -1;
- }
+ /* Run MST and SSSP algorithms */
- 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;
+ graph();
}
- cl->socket = nfd;
- cl->status.dataopen = 1;
-cp
- return 0;
-}
+ /* Check if this was our outgoing connection */
-/*
- handle an incoming tcp connect call and open
- a connection to it.
-*/
-conn_list_t *create_new_connection(int sfd)
-{
- conn_list_t *p;
- struct sockaddr_in ci;
- int len = sizeof(ci);
-cp
- p = new_conn_list();
-
- if(getpeername(sfd, &ci, &len) < 0)
+ if(c->outgoing)
{
- syslog(LOG_ERR, "Error: getpeername: %m");
- return NULL;
- }
-
- p->hostname = hostlookup(ci.sin_addr.s_addr);
- p->real_ip = ntohl(ci.sin_addr.s_addr);
- p->meta_socket = sfd;
- p->status.meta = 1;
- p->buflen = 0;
- p->last_ping_time = time(NULL);
- p->want_ping = 0;
-
- syslog(LOG_NOTICE, "Connection from %s:%d", p->hostname, htons(ci.sin_port));
-
- if(send_basic_info(p) < 0)
- {
- free(p);
- return NULL;
+ retry_outgoing(c->outgoing);
+ c->outgoing = NULL;
}
-cp
- return p;
-}
-
-/*
- put all file descriptors in an fd_set array
-*/
-void build_fdset(fd_set *fs)
-{
- conn_list_t *p;
-cp
- FD_ZERO(fs);
-
- for(p = conn_list; p != NULL; p = p->next)
- {
- if(p->status.meta)
- FD_SET(p->meta_socket, fs);
- if(p->status.dataopen)
- FD_SET(p->socket, fs);
- }
-
- FD_SET(myself->meta_socket, fs);
- FD_SET(myself->socket, fs);
- FD_SET(tap_fd, fs);
-cp
-}
-
-/*
- receive incoming data from the listening
- udp socket and write it to the ethertap
- device after being decrypted
-*/
-int handle_incoming_vpn_data(conn_list_t *cl)
-{
- real_packet_t rp;
- int lenin;
- int x, l = sizeof(x);
- conn_list_t *f;
-cp
- if(getsockopt(cl->socket, SOL_SOCKET, SO_ERROR, &x, &l) < 0)
- {
- syslog(LOG_ERR, "This is a bug: %s:%d: %d:%m", __FILE__, __LINE__, cl->socket);
- return -1;
- }
- if(x)
- {
- syslog(LOG_ERR, "Incoming data socket error: %s", sys_errlist[x]);
- return -1;
- }
-
- rp.len = -1;
- lenin = recvfrom(cl->socket, &rp, MTU, 0, NULL, NULL);
- if(lenin <= 0)
- {
- syslog(LOG_ERR, "Receiving data failed: %m");
- return -1;
- }
- total_socket_in += lenin;
-
- rp.data.len = ntohs(rp.data.len);
- rp.len = ntohs(rp.len);
- rp.from = ntohl(rp.from);
-
- if(rp.len >= 0)
- {
- f = lookup_conn(rp.from);
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, "packet from " IP_ADDR_S " (len %d)",
- IP_ADDR_V(rp.from), rp.len);
- if(!f)
- {
- syslog(LOG_ERR, "Got packet from unknown source " IP_ADDR_S,
- IP_ADDR_V(rp.from));
- return -1;
- }
-
- 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();
- }
-cp
- return 0;
-}
-
-/*
- terminate a connection and notify the other
- end before closing the sockets
-*/
-void terminate_connection(conn_list_t *cl)
-{
-cp
- if(cl->status.remove)
- return;
-
- if(debug_lvl > 0)
- syslog(LOG_NOTICE, "Closing connection with %s.", cl->hostname);
-
- if(cl->status.timeout)
- send_timeout(cl);
- else if(!cl->status.termreq)
- send_termreq(cl);
-
- close(cl->socket);
- if(cl->status.meta)
- close(cl->meta_socket);
-
- if(cl->status.outgoing)
- {
- signal(SIGALRM, sigalrm_handler);
- alarm(5);
- syslog(LOG_NOTICE, "Try to re-establish outgoing connection in 5 seconds.");
- }
-
- cl->status.active = 0;
- cl->status.remove = 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.remove)
- continue;
- 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)
{
- 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);
+ 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 if(p->want_ping)
+ else
{
- send_ping(p);
- p->last_ping_time = now;
- p->status.pinged = 1;
- p->status.got_pong = 0;
+ send_ping(c);
}
}
- }
- }
-cp
- return 0;
-}
-
-/*
- accept a new tcp connect and create a
- new connection
-*/
-int handle_new_meta_connection(conn_list_t *cl)
-{
- conn_list_t *ncn;
- struct sockaddr client;
- int nfd, len = sizeof(client);
-cp
- if((nfd = accept(cl->meta_socket, &client, &len)) < 0)
- {
- syslog(LOG_ERR, "Accepting a new connection failed: %m");
- return -1;
- }
-
- if((ncn = create_new_connection(nfd)) == NULL)
- {
- shutdown(nfd, 2);
- close(nfd);
- syslog(LOG_NOTICE, "Closed attempted connection.");
- return 0;
+ else
+ {
+ if(debug_lvl >= DEBUG_CONNECTIONS)
+ syslog(LOG_WARNING, _("Timeout from %s (%s) during authentication"),
+ c->name, c->hostname);
+ terminate_connection(c, 0);
+ }
+ }
}
-
- ncn->status.meta = 1;
- ncn->next = conn_list;
- conn_list = ncn;
cp
- return 0;
}
/*
- dispatch any incoming meta requests
+ check all connections to see if anything
+ happened on their sockets
*/
-int handle_incoming_meta_data(conn_list_t *cl)
+void check_network_activity(fd_set *f)
{
- int x, l = sizeof(x);
- int request, oldlen, i;
- int lenin = 0;
+ connection_t *c;
+ avl_node_t *node;
+ int result, i;
+ int len = sizeof(result);
+ vpn_packet_t packet;
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)
+ if(FD_ISSET(device_fd, f))
{
- syslog(LOG_ERR, "Metadata socket error: %s", sys_errlist[x]);
- return -1;
+ if(!read_packet(&packet))
+ route_outgoing(&packet);
}
- if(cl->buflen >= MAXBUFSIZE)
+ for(node = connection_tree->head; node; node = node->next)
{
- syslog(LOG_ERR, "Metadata read buffer full! Discarding contents.");
- cl->buflen = 0;
- }
+ c = (connection_t *)node->data;
- lenin = read(cl->meta_socket, cl->buffer, MAXBUFSIZE-cl->buflen);
+ if(c->status.remove)
+ continue;
- if(lenin<=0)
- {
- syslog(LOG_ERR, "Metadata socket read error: %m");
- return -1;
- }
-
- oldlen = cl->buflen;
- cl->buflen += lenin;
-
- for(;;)
- {
- cl->reqlen = 0;
-
- for(i = oldlen; i < cl->buflen; i++)
+ if(FD_ISSET(c->socket, f))
{
- if(cl->buffer[i] == '\n')
+ if(c->status.connecting)
{
- 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)
+ c->status.connecting = 0;
+ getsockopt(c->socket, SOL_SOCKET, SO_ERROR, &result, &len);
+ if(!result)
+ finish_connecting(c);
+ else
{
- syslog(LOG_ERR, "Unknown request: %s", cl->buffer);
- return 0;
+ if(debug_lvl >= DEBUG_CONNECTIONS)
+ syslog(LOG_DEBUG, _("Error while connecting to %s (%s): %s"), c->name, c->hostname, strerror(result));
+ close(c->socket);
+ do_outgoing_connection(c);
+ continue;
}
-
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, "Got request: %s", cl->buffer);
-
- request_handlers[request](cl);
}
- else
+ if(receive_meta(c) < 0)
{
- syslog(LOG_ERR, "Bogus data received: %s", cl->buffer);
+ terminate_connection(c, c->status.active);
+ continue;
}
-
- cl->buflen -= cl->reqlen;
- memmove(cl->buffer, cl->buffer + cl->reqlen, cl->buflen);
- oldlen = 0;
- }
- else
- {
- break;
}
}
- cl->last_ping_time = time(NULL);
- cl->want_ping = 0;
-cp
- return 0;
-}
-
-/*
- check all connections to see if anything
- happened on their sockets
-*/
-void check_network_activity(fd_set *f)
-{
- conn_list_t *p;
- int x, l = sizeof(x);
-cp
- for(p = conn_list; p != NULL; p = p->next)
- {
- if(p->status.remove)
- continue;
-
- if(p->status.dataopen)
- if(FD_ISSET(p->socket, f))
- {
- /*
- The only thing that can happen to get us here is apparently an
- error on this outgoing(!) UDP socket that isn't immediate (i.e.
- something that will not trigger an error directly on send()).
- I've once got here when it said `No route to host'.
- */
- getsockopt(p->socket, SOL_SOCKET, SO_ERROR, &x, &l);
- syslog(LOG_ERR, "Outgoing data socket error: %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)
- {
- syslog(LOG_ERR, "Error while reading from tapdevice: %m");
- return;
- }
-
- total_tap_in += lenin;
-
- ether_type = ntohs(*((unsigned short*)(&vp.data[12])));
- if(ether_type != 0x0800)
+ for(i = 0; i < listen_sockets; i++)
{
- 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(FD_ISSET(listen_socket[i].udp, f))
+ handle_incoming_vpn_data(listen_socket[i].udp);
+ if(FD_ISSET(listen_socket[i].tcp, f))
+ handle_new_meta_connection(listen_socket[i].tcp);
}
-
- if(lenin < 32)
- {
- if(debug_lvl > 0)
- syslog(LOG_INFO, "Dropping short packet");
- return;
- }
-
- from = ntohl(*((unsigned long*)(&vp.data[26])));
- to = ntohl(*((unsigned long*)(&vp.data[30])));
-
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, "An IP packet (%04x) for " IP_ADDR_S " from " IP_ADDR_S,
- ether_type, IP_ADDR_V(to), IP_ADDR_V(from));
- if(debug_lvl > 4)
- syslog(LOG_DEBUG, MAC_ADDR_S " to " MAC_ADDR_S,
- MAC_ADDR_V(vp.data[0]), MAC_ADDR_V(vp.data[6]));
-
- vp.len = (length_t)lenin - 2;
-
- strip_mac_addresses(&vp);
-
- send_packet(to, &vp);
cp
}
struct timeval tv;
int r;
time_t last_ping_check;
+ event_t *event;
cp
- last_ping_check = time(NULL);
+ last_ping_check = now;
+
+ srand(now);
for(;;)
{
- tv.tv_sec = timeout;
+ now = time(NULL);
+
+ tv.tv_sec = 1 + (rand() & 7); /* Approx. 5 seconds, randomized to prevent global synchronisation effects */
tv.tv_usec = 0;
- prune_conn_list();
build_fdset(&fset);
if((r = select(FD_SETSIZE, &fset, NULL, NULL, &tv)) < 0)
{
- if(errno == EINTR) /* because of alarm */
- continue;
- syslog(LOG_ERR, "Error while waiting for input: %m");
- return;
- }
+ if(errno != EINTR && errno != EAGAIN)
+ {
+ syslog(LOG_ERR, _("Error while waiting for input: %s"), strerror(errno));
+ cp_trace();
+ dump_connections();
+ return;
+ }
- if(last_ping_check + timeout < time(NULL))
- /* Let's check if everybody is still alive */
- {
- check_dead_connections();
- last_ping_check = time(NULL);
continue;
- }
+ }
check_network_activity(&fset);
- /* local tap data */
- if(FD_ISSET(tap_fd, &fset))
- handle_tap_input();
+ if(do_purge)
+ {
+ purge();
+ do_purge = 0;
+ }
+
+ /* Let's check if everybody is still alive */
+
+ if(last_ping_check + pingtimeout < now)
+ {
+ check_dead_connections();
+ last_ping_check = now;
+
+ if(routing_mode== RMODE_SWITCH)
+ age_mac();
+
+ age_past_requests();
+
+ /* Should we regenerate our key? */
+
+ if(keyexpires < now)
+ {
+ 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 = now + keylifetime;
+ }
+ }
+
+
+ while((event = get_expired_event()))
+ {
+ event->handler(event->data);
+ free(event);
+ }
+
+ if(sigalrm)
+ {
+ syslog(LOG_INFO, _("Flushing event queue"));
+
+ while(event_tree->head)
+ {
+ event = (event_t *)event_tree->head->data;
+ event->handler(event->data);
+ event_del(event);
+ }
+ sigalrm = 0;
+ }
+
+ if(sighup)
+ {
+ sighup = 0;
+ close_network_connections();
+ exit_configuration(&config_tree);
+
+ syslog(LOG_INFO, _("Rereading configuration file and restarting in 5 seconds..."));
+ sleep(5);
+
+ init_configuration(&config_tree);
+
+ if(read_server_config())
+ {
+ syslog(LOG_ERR, _("Unable to reread configuration file, exitting."));
+ exit(1);
+ }
+
+ if(setup_network_connections())
+ return;
+
+ continue;
+ }
}
cp
}
projects / tinc / blobdiff