along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- $Id: net.c,v 1.35.4.14 2000/06/29 17:09:05 guus Exp $
+ $Id: net.c,v 1.35.4.66 2000/11/04 20:44:26 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>
#include <stdio.h>
#include <sys/types.h>
#include <syslog.h>
#include <unistd.h>
+#include <sys/ioctl.h>
+#include <openssl/rand.h>
+#include <openssl/evp.h>
+#include <openssl/err.h>
+
+#ifdef HAVE_TUNTAP
+#include LINUX_IF_TUN_H
+#endif
-#include <cipher.h>
#include <utils.h>
#include <xalloc.h>
#include "conf.h"
-#include "encr.h"
+#include "connlist.h"
+#include "meta.h"
#include "net.h"
#include "netutl.h"
#include "protocol.h"
+#include "subnet.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 upstreamindex = 0;
+config_t *upstreamcfg;
static int seconds_till_retry;
-/* The global list of existing connections */
-conn_list_t *conn_list = NULL;
-conn_list_t *myself = NULL;
+int keylifetime = 0;
+int keyexpires = 0;
-/*
- 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
-}
+char *unknown = NULL;
+char *interface_name = NULL; /* Contains the name of the interface */
+
+subnet_t mymac;
/*
- reassemble MAC addresses
+ Execute the given script.
+ This function doesn't really belong here.
*/
-void add_mac_addresses(vpn_packet_t *p)
+int execute_script(const char* name)
{
- 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
+ char *scriptname;
+ pid_t pid;
+ char *s;
+
+ if((pid = fork()) < 0)
+ {
+ syslog(LOG_ERR, _("System call `%s' failed: %m"),
+ "fork");
+ return -1;
+ }
+
+ if(pid)
+ {
+ return 0;
+ }
+
+ /* Child here */
+
+ asprintf(&scriptname, "%s/%s", confbase, name);
+ asprintf(&s, "IFNAME=%s", interface_name);
+ putenv(s);
+ free(s);
+
+ if(netname)
+ {
+ asprintf(&s, "NETNAME=%s", netname);
+ putenv(s);
+ free(s);
+ }
+ else
+ {
+ unsetenv("NETNAME");
+ }
+
+ if(chdir(confbase) < 0)
+ {
+ syslog(LOG_ERR, _("Couldn't chdir to `%s': %m"),
+ confbase);
+ }
+
+ execl(scriptname, NULL);
+ /* No return on success */
+
+ if(errno != ENOENT) /* Ignore if the file does not exist */
+ syslog(LOG_WARNING, _("Error executing `%s': %m"), scriptname);
+
+ /* No need to free things */
+ exit(0);
}
-int xsend(conn_list_t *cl, void *packet)
+int xsend(conn_list_t *cl, vpn_packet_t *inpkt)
{
- int r;
- real_packet_t rp;
+ vpn_packet_t outpkt;
+ int outlen, outpad;
+ EVP_CIPHER_CTX ctx;
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);
+ outpkt.len = inpkt->len;
+
+ /* Encrypt the packet */
+
+ EVP_EncryptInit(&ctx, cl->cipher_pkttype, cl->cipher_pktkey, cl->cipher_pktkey + cl->cipher_pkttype->key_len);
+ EVP_EncryptUpdate(&ctx, outpkt.data, &outlen, inpkt->data, inpkt->len);
+ EVP_EncryptFinal(&ctx, outpkt.data + outlen, &outpad);
+ outlen += outpad + 2;
+
+/* Bypass
+ outlen = outpkt.len + 2;
+ memcpy(&outpkt, inpkt, outlen);
+*/
- if(debug_lvl > 3)
+ if(debug_lvl >= DEBUG_TRAFFIC)
syslog(LOG_ERR, _("Sending packet of %d bytes to %s (%s)"),
- ntohs(rp.len), cl->vpn_hostname, cl->real_hostname);
+ outlen, cl->name, cl->hostname);
- if((r = send(cl->socket, (char*)&rp, ntohs(rp.len), 0)) < 0)
+ total_socket_out += outlen;
+
+ if((send(cl->socket, (char *) &(outpkt.len), outlen, 0)) < 0)
{
syslog(LOG_ERR, _("Error sending packet to %s (%s): %m"),
- cl->vpn_hostname, cl->real_hostname);
+ cl->name, cl->hostname);
return -1;
}
-
- total_socket_out += r;
-
- cl->want_ping = 1;
cp
return 0;
}
-int xrecv(conn_list_t *cl, void *packet)
+int xrecv(vpn_packet_t *inpkt)
{
- vpn_packet_t vp;
- int lenin;
+ vpn_packet_t outpkt;
+ int outlen, outpad;
+ EVP_CIPHER_CTX ctx;
cp
- do_decrypt((real_packet_t*)packet, &vp, cl->key);
- add_mac_addresses(&vp);
+ outpkt.len = inpkt->len;
- if(debug_lvl > 3)
- syslog(LOG_ERR, _("Receiving packet of %d bytes from %s (%s)"),
- ((real_packet_t*)packet)->len, cl->vpn_hostname, cl->real_hostname);
+ /* Decrypt the packet */
- 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;
+ 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);
- cl->want_ping = 0;
- cl->last_ping_time = time(NULL);
+ /* Fix mac address */
+
+ memcpy(outpkt.data, mymac.net.mac.address.x, 6);
+
+ if(taptype == TAP_TYPE_TUNTAP)
+ {
+ if(write(tap_fd, outpkt.data, outpkt.len) < 0)
+ syslog(LOG_ERR, _("Can't write to tun/tap device: %m"));
+ else
+ total_tap_out += outpkt.len;
+ }
+ else /* ethertap */
+ {
+ if(write(tap_fd, outpkt.data - 2, outpkt.len + 2) < 0)
+ syslog(LOG_ERR, _("Can't write to ethertap device: %m"));
+ else
+ total_tap_out += outpkt.len + 2;
+ }
cp
return 0;
}
p = next;
}
- if(debug_lvl > 3)
+ if(debug_lvl >= DEBUG_TRAFFIC)
syslog(LOG_DEBUG, _("Queue flushed"));
cp
}
cp
if(cl->sq)
{
- if(debug_lvl > 3)
+ if(debug_lvl >= DEBUG_TRAFFIC)
syslog(LOG_DEBUG, _("Flushing send queue for %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
+ cl->name, cl->hostname);
flush_queue(cl, &(cl->sq), xsend);
}
if(cl->rq)
{
- if(debug_lvl > 3)
+ if(debug_lvl >= DEBUG_TRAFFIC)
syslog(LOG_DEBUG, _("Flushing receive queue for %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
+ cl->name, cl->hostname);
flush_queue(cl, &(cl->rq), xrecv);
}
cp
int send_packet(ip_t to, vpn_packet_t *packet)
{
conn_list_t *cl;
+ subnet_t *subnet;
cp
- if((cl = lookup_conn(to)) == NULL)
+ if((subnet = lookup_subnet_ipv4(to)) == NULL)
{
- if(debug_lvl > 3)
+ if(debug_lvl >= DEBUG_TRAFFIC)
{
syslog(LOG_NOTICE, _("Trying to look up %d.%d.%d.%d in connection list failed!"),
IP_ADDR_V(to));
}
-
- /* Is this really necessary? If we can't find "to", then neither should any uplink. (GS) */
-
+
return -1;
-
- for(cl = conn_list; cl != NULL && !cl->status.outgoing; cl = cl->next);
- if(!cl)
- { /* No open outgoing connection has been found. */
- if(debug_lvl > 3)
- syslog(LOG_NOTICE, _("There is no remote host I can send this packet to!"));
- return -1;
- }
}
+
+ cl = subnet->owner;
- /* If we ourselves have indirectdata flag set, we should send only to our uplink! */
-
- if(myself->flags & EXPORTINDIRECTDATA)
+ if(cl == myself)
{
- for(cl = conn_list; cl != NULL && !cl->status.outgoing; cl = cl->next);
- if(!cl)
- { /* No open outgoing connection has been found. */
- if(debug_lvl > 3)
- syslog(LOG_NOTICE, _("There is no remote host I can send this packet to!"));
- return -1;
- }
- }
- else
-
- /* If indirectdata flag is set for the destination we just looked up,
- * then real_ip is actually the vpn_ip of the gateway tincd
- * it is behind.
- */
-
- if(cl->flags & INDIRECTDATA)
- {
- if(debug_lvl > 3)
- syslog(LOG_NOTICE, _("Indirect packet to %s via %s"),
- cl->vpn_hostname, cl->real_hostname);
- if((cl = lookup_conn(cl->real_ip)) == NULL)
+ if(debug_lvl >= DEBUG_TRAFFIC)
{
- if(debug_lvl > 3)
- syslog(LOG_NOTICE, _("Indirect look up %d.%d.%d.%d in connection list failed!"),
- IP_ADDR_V(to));
-
- /* Gateway tincd dead? Should we kill it? (GS) */
-
- return -1;
- }
- if(cl->flags & INDIRECTDATA) /* This should not happen */
- {
- if(debug_lvl > 3)
- syslog(LOG_NOTICE, _("Double indirection for %d.%d.%d.%d"),
- IP_ADDR_V(to));
- return -1;
+ syslog(LOG_NOTICE, _("Packet with destination %d.%d.%d.%d is looping back to us!"),
+ IP_ADDR_V(to));
}
- }
- if(my_key_expiry <= time(NULL))
- regenerate_keys();
+ return -1;
+ }
+
+ /* If we ourselves have indirectdata flag set, we should send only to our uplink! */
+ /* FIXME - check for indirection and reprogram it The Right Way(tm) this time. */
+
if(!cl->status.dataopen)
if(setup_vpn_connection(cl) < 0)
{
- syslog(LOG_ERR, _("Could not open UDP connection to %s (%s)"), cl->vpn_hostname, cl->real_hostname);
+ syslog(LOG_ERR, _("Could not open UDP connection to %s (%s)"),
+ cl->name, cl->hostname);
return -1;
}
if(!cl->status.validkey)
{
- if(debug_lvl > 3)
- syslog(LOG_INFO, _("%s (%s) has no valid key, queueing packet"), cl->vpn_hostname, cl->real_hostname);
+/* 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_key_request(cl->vpn_ip); /* Keys should be sent to the host running the tincd */
+ send_req_key(myself, cl); /* Keys should be sent to the host running the tincd */
return 0;
}
if(!cl->status.active)
{
- if(debug_lvl > 3)
- syslog(LOG_INFO, _("%s (%s) is not ready, queueing packet"), cl->vpn_hostname, cl->real_hostname);
+/* 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? */
}
int nfd;
const char *tapfname;
config_t const *cfg;
+ struct ifreq ifr;
+
cp
- if((cfg = get_config_val(tapdevice)) == NULL)
- tapfname = "/dev/tap0";
- else
+ if((cfg = get_config_val(config, tapdevice)))
tapfname = cfg->data.ptr;
-
+ else
+#ifdef HAVE_TUNTAP
+ tapfname = "/dev/misc/net/tun";
+#else
+ tapfname = "/dev/tap0";
+#endif
+cp
if((nfd = open(tapfname, O_RDWR | O_NONBLOCK)) < 0)
{
syslog(LOG_ERR, _("Could not open %s: %m"), tapfname);
return -1;
}
-
+cp
tap_fd = nfd;
+
+ /* Set default MAC address for ethertap devices */
+
+ taptype = TAP_TYPE_ETHERTAP;
+ mymac.type = SUBNET_MAC;
+ mymac.net.mac.address.x[0] = 0xfe;
+ mymac.net.mac.address.x[1] = 0xfd;
+ mymac.net.mac.address.x[2] = 0x00;
+ mymac.net.mac.address.x[3] = 0x00;
+ mymac.net.mac.address.x[4] = 0x00;
+ mymac.net.mac.address.x[5] = 0x00;
+
+#ifdef HAVE_TUNTAP
+ /* Ok now check if this is an old ethertap or a new tun/tap thingie */
+ memset(&ifr, 0, sizeof(ifr));
+cp
+ ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
+ if (netname)
+ strncpy(ifr.ifr_name, netname, IFNAMSIZ);
+cp
+ if (!ioctl(tap_fd, TUNSETIFF, (void *) &ifr))
+ {
+ syslog(LOG_INFO, _("%s is a new style tun/tap device"), tapfname);
+ taptype = TAP_TYPE_TUNTAP;
+ }
+#endif
+
+ /* Add name of network interface to environment (for scripts) */
+
+ ioctl(tap_fd, SIOCGIFNAME, (void *) &ifr);
+ interface_name = xmalloc(strlen(ifr.ifr_name));
+ strcpy(interface_name, ifr.ifr_name);
+
cp
return 0;
}
int nfd, flags;
struct sockaddr_in a;
const int one = 1;
+ config_t const *cfg;
cp
if((nfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
{
if(setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)))
{
- syslog(LOG_ERR, _("setsockopt: %m"));
+ syslog(LOG_ERR, _("System call `%s' failed: %m"),
+ "setsockopt");
+ return -1;
+ }
+
+ if(setsockopt(nfd, SOL_SOCKET, SO_KEEPALIVE, &one, sizeof(one)))
+ {
+ syslog(LOG_ERR, _("System call `%s' failed: %m"),
+ "setsockopt");
return -1;
}
flags = fcntl(nfd, F_GETFL);
if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0)
{
- syslog(LOG_ERR, _("fcntl: %m"));
+ syslog(LOG_ERR, _("System call `%s' failed: %m"),
+ "fcntl");
return -1;
}
+ if((cfg = get_config_val(config, interface)))
+ {
+ if(setsockopt(nfd, SOL_SOCKET, SO_KEEPALIVE, cfg->data.ptr, strlen(cfg->data.ptr)))
+ {
+ syslog(LOG_ERR, _("Unable to bind listen socket to interface %s: %m"), cfg->data.ptr);
+ return -1;
+ }
+ }
+
memset(&a, 0, sizeof(a));
a.sin_family = AF_INET;
a.sin_port = htons(port);
- a.sin_addr.s_addr = htonl(INADDR_ANY);
+
+ if((cfg = get_config_val(config, interfaceip)))
+ a.sin_addr.s_addr = htonl(cfg->data.ip->address);
+ else
+ a.sin_addr.s_addr = htonl(INADDR_ANY);
if(bind(nfd, (struct sockaddr *)&a, sizeof(struct sockaddr)))
{
if(listen(nfd, 3))
{
- syslog(LOG_ERR, _("listen: %m"));
+ syslog(LOG_ERR, _("System call `%s' failed: %m"),
+ "listen");
return -1;
}
cp
if(setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)))
{
- syslog(LOG_ERR, _("setsockopt: %m"));
+ syslog(LOG_ERR, _("System call `%s' failed: %m"),
+ "setsockopt");
return -1;
}
flags = fcntl(nfd, F_GETFL);
if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0)
{
- syslog(LOG_ERR, _("fcntl: %m"));
+ syslog(LOG_ERR, _("System call `%s' failed: %m"),
+ "fcntl");
return -1;
}
struct sockaddr_in a;
config_t const *cfg;
cp
- if(debug_lvl > 0)
- syslog(LOG_INFO, _("Trying to connect to %s"), cl->real_hostname);
+ if(debug_lvl >= DEBUG_CONNECTIONS)
+ syslog(LOG_INFO, _("Trying to connect to %s"), cl->hostname);
- if((cfg = get_config_val(upstreamport)) == NULL)
+ if((cfg = get_config_val(cl->config, port)) == NULL)
cl->port = 655;
else
cl->port = cfg->data.val;
cl->meta_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if(cl->meta_socket == -1)
{
- syslog(LOG_ERR, _("Creating socket failed: %m"));
+ syslog(LOG_ERR, _("Creating socket for %s port %d failed: %m"),
+ cl->hostname, cl->port);
return -1;
}
a.sin_family = AF_INET;
a.sin_port = htons(cl->port);
- a.sin_addr.s_addr = htonl(cl->real_ip);
+ a.sin_addr.s_addr = htonl(cl->address);
if(connect(cl->meta_socket, (struct sockaddr *)&a, sizeof(a)) == -1)
{
- syslog(LOG_ERR, _("%s port %hd: %m"), cl->real_hostname, cl->port);
+ syslog(LOG_ERR, _("%s port %hd: %m"), cl->hostname, cl->port);
return -1;
}
flags = fcntl(cl->meta_socket, F_GETFL);
if(fcntl(cl->meta_socket, F_SETFL, flags | O_NONBLOCK) < 0)
{
- syslog(LOG_ERR, _("fcntl: %m"));
+ syslog(LOG_ERR, _("fcntl for %s port %d: %m"),
+ cl->hostname, cl->port);
return -1;
}
- syslog(LOG_INFO, _("Connected to %s port %hd"),
- cl->real_hostname, cl->port);
+ if(debug_lvl >= DEBUG_CONNECTIONS)
+ syslog(LOG_INFO, _("Connected to %s port %hd"),
+ cl->hostname, cl->port);
+
+ cl->status.meta = 1;
cp
return 0;
}
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;
+ struct hostent *h;
+ config_t const *cfg;
cp
+ if(check_id(name))
+ {
+ syslog(LOG_ERR, _("Invalid name for outgoing connection"));
+ return -1;
+ }
+
ncn = new_conn_list();
- ncn->real_ip = ip;
- ncn->real_hostname = hostlookup(htonl(ip));
+ asprintf(&ncn->name, "%s", name);
+
+ if(read_host_config(ncn))
+ {
+ syslog(LOG_ERR, _("Error reading host configuration file for %s"));
+ free_conn_list(ncn);
+ return -1;
+ }
+
+ if(!(cfg = get_config_val(ncn->config, address)))
+ {
+ syslog(LOG_ERR, _("No address specified for %s"));
+ free_conn_list(ncn);
+ return -1;
+ }
+
+ if(!(h = gethostbyname(cfg->data.ptr)))
+ {
+ syslog(LOG_ERR, _("Error looking up `%s': %m"), cfg->data.ptr);
+ free_conn_list(ncn);
+ return -1;
+ }
+
+ ncn->address = ntohl(*((ip_t*)(h->h_addr_list[0])));
+ ncn->hostname = hostlookup(htonl(ncn->address));
if(setup_outgoing_meta_socket(ncn) < 0)
{
syslog(LOG_ERR, _("Could not set up a meta connection to %s"),
- ncn->real_hostname);
- free_conn_element(ncn);
+ ncn->hostname);
+ free_conn_list(ncn);
return -1;
}
- ncn->status.meta = 1;
ncn->status.outgoing = 1;
- ncn->next = conn_list;
- conn_list = ncn;
+ ncn->buffer = xmalloc(MAXBUFSIZE);
+ ncn->buflen = 0;
+ ncn->last_ping_time = time(NULL);
+
+ conn_list_add(ncn);
+
+ send_id(ncn);
cp
return 0;
}
/*
- set up the local sockets (listen only)
+ Configure conn_list_t myself and set up the local sockets (listen only)
*/
int setup_myself(void)
{
config_t const *cfg;
+ subnet_t *net;
cp
myself = new_conn_list();
- if(!(cfg = get_config_val(myvpnip)))
+ asprintf(&myself->hostname, "MYSELF"); /* FIXME? Do hostlookup on ourselves? */
+ myself->flags = 0;
+ myself->protocol_version = PROT_CURRENT;
+
+ if(!(cfg = get_config_val(config, tincname))) /* Not acceptable */
{
- syslog(LOG_ERR, _("No value for my VPN IP given"));
+ syslog(LOG_ERR, _("Name for tinc daemon required!"));
return -1;
}
+ else
+ asprintf(&myself->name, "%s", (char*)cfg->data.val);
- myself->vpn_ip = cfg->data.ip->ip;
- myself->vpn_hostname = hostlookup(htonl(myself->vpn_ip));
- myself->real_hostname = hostlookup(htonl(myself->vpn_ip));
- myself->vpn_mask = cfg->data.ip->mask;
- myself->flags = 0;
+ if(check_id(myself->name))
+ {
+ syslog(LOG_ERR, _("Invalid name for myself!"));
+ return -1;
+ }
+cp
+ if(!(cfg = get_config_val(config, privatekey)))
+ {
+ syslog(LOG_ERR, _("Private key for tinc daemon required!"));
+ return -1;
+ }
+ else
+ {
+ myself->rsa_key = RSA_new();
+ BN_hex2bn(&myself->rsa_key->d, cfg->data.ptr);
+ BN_hex2bn(&myself->rsa_key->e, "FFFF");
+ }
- if(!(cfg = get_config_val(listenport)))
+ if(read_host_config(myself))
+ {
+ syslog(LOG_ERR, _("Cannot open host configuration file for myself!"));
+ return -1;
+ }
+cp
+ if(!(cfg = get_config_val(myself->config, publickey)))
+ {
+ syslog(LOG_ERR, _("Public key for tinc daemon required!"));
+ return -1;
+ }
+ else
+ {
+ BN_hex2bn(&myself->rsa_key->n, cfg->data.ptr);
+ }
+/*
+ if(RSA_check_key(myself->rsa_key) != 1)
+ {
+ syslog(LOG_ERR, _("Invalid public/private keypair!"));
+ return -1;
+ }
+*/
+ if(!(cfg = get_config_val(myself->config, port)))
myself->port = 655;
else
myself->port = cfg->data.val;
- if(cfg = get_config_val(indirectdata))
+ if((cfg = get_config_val(myself->config, indirectdata)))
if(cfg->data.val == stupid_true)
myself->flags |= EXPORTINDIRECTDATA;
+ if((cfg = get_config_val(myself->config, tcponly)))
+ if(cfg->data.val == stupid_true)
+ myself->flags |= TCPONLY;
+
+/* Read in all the subnets specified in the host configuration file */
+
+ for(cfg = myself->config; (cfg = get_config_val(cfg, subnet)); cfg = cfg->next)
+ {
+ net = new_subnet();
+ net->type = SUBNET_IPV4;
+ net->net.ipv4.address = cfg->data.ip->address;
+ net->net.ipv4.mask = cfg->data.ip->mask;
+
+ /* Teach newbies what subnets are... */
+
+ if((net->net.ipv4.address & net->net.ipv4.mask) != net->net.ipv4.address)
+ {
+ syslog(LOG_ERR, _("Network address and subnet mask do not match!"));
+ return -1;
+ }
+
+ subnet_add(myself, net);
+ }
+
if((myself->meta_socket = setup_listen_meta_socket(myself->port)) < 0)
{
- syslog(LOG_ERR, _("Unable to set up a listening socket"));
+ syslog(LOG_ERR, _("Unable to set up a listening socket!"));
return -1;
}
if((myself->socket = setup_vpn_in_socket(myself->port)) < 0)
{
- syslog(LOG_ERR, _("Unable to set up an incoming vpn data socket"));
+ syslog(LOG_ERR, _("Unable to set up an incoming vpn data socket!"));
close(myself->meta_socket);
return -1;
}
+ /* Generate packet encryption key */
+
+ myself->cipher_pkttype = EVP_bf_cfb();
+
+ myself->cipher_pktkeylength = myself->cipher_pkttype->key_len + myself->cipher_pkttype->iv_len;
+
+ myself->cipher_pktkey = (char *)xmalloc(myself->cipher_pktkeylength);
+ RAND_bytes(myself->cipher_pktkey, myself->cipher_pktkeylength);
+
+ if(!(cfg = get_config_val(config, keyexpire)))
+ keylifetime = 3600;
+ else
+ keylifetime = cfg->data.val;
+
+ keyexpires = time(NULL) + keylifetime;
+
+ /* Activate ourselves */
+
myself->status.active = 1;
syslog(LOG_NOTICE, _("Ready: listening on port %hd"), myself->port);
{
config_t const *cfg;
cp
- cfg = get_next_config_val(upstreamip, upstreamindex++);
+ cfg = get_config_val(upstreamcfg, connectto);
+
+ if(!cfg && upstreamcfg == config)
+ /* No upstream IP given, we're listen only. */
+ return;
while(cfg)
{
- if(!setup_outgoing_connection(cfg->data.ip->ip)) /* function returns 0 when there are no problems */
+ upstreamcfg = cfg->next;
+ if(!setup_outgoing_connection(cfg->data.ptr)) /* function returns 0 when there are no problems */
{
signal(SIGALRM, SIG_IGN);
return;
}
- cfg = get_next_config_val(upstreamip, upstreamindex++); /* Or else we try the next ConnectTo line */
+ cfg = get_config_val(upstreamcfg, connectto); /* Or else we try the next ConnectTo line */
}
signal(SIGALRM, sigalrm_handler);
- upstreamindex = 0;
+ upstreamcfg = config;
seconds_till_retry += 5;
- if(seconds_till_retry>300) /* Don't wait more than 5 minutes. */
- seconds_till_retry = 300;
- alarm(seconds_till_retry);
+ if(seconds_till_retry > MAXTIMEOUT) /* Don't wait more than MAXTIMEOUT seconds. */
+ seconds_till_retry = MAXTIMEOUT;
syslog(LOG_ERR, _("Still failed to connect to other, will retry in %d seconds"),
seconds_till_retry);
+ alarm(seconds_till_retry);
cp
}
{
config_t const *cfg;
cp
- if((cfg = get_config_val(pingtimeout)) == NULL)
- timeout = 5;
+ if((cfg = get_config_val(config, pingtimeout)) == NULL)
+ timeout = 60;
else
- timeout = cfg->data.val;
+ {
+ timeout = cfg->data.val;
+ if(timeout < 1)
+ {
+ timeout = 86400;
+ }
+ }
if(setup_tap_fd() < 0)
return -1;
if(setup_myself() < 0)
return -1;
- if((cfg = get_next_config_val(upstreamip, upstreamindex++)) == NULL)
+ /* 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)
{
- if(!setup_outgoing_connection(cfg->data.ip->ip)) /* function returns 0 when there are no problems */
+ upstreamcfg = cfg->next;
+ if(!setup_outgoing_connection(cfg->data.ptr)) /* function returns 0 when there are no problems */
return 0;
- cfg = get_next_config_val(upstreamip, upstreamindex++); /* Or else we try the next ConnectTo line */
+ cfg = get_config_val(upstreamcfg, connectto); /* Or else we try the next ConnectTo line */
}
signal(SIGALRM, sigalrm_handler);
- upstreamindex = 0;
- seconds_till_retry = 300;
+ 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);
- syslog(LOG_NOTICE, _("Trying to re-establish outgoing connection in 5 minutes"));
cp
return 0;
}
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);
- }
+ p->status.active = 0;
+ terminate_connection(p);
}
if(myself)
{
close(myself->meta_socket);
close(myself->socket);
+ free_conn_list(myself);
+ myself = NULL;
}
close(tap_fd);
+
+ /* Execute tinc-down script right after shutting down the interface */
+ execute_script("tinc-down");
+
destroy_conn_list();
syslog(LOG_NOTICE, _("Terminating"));
int nfd, flags;
struct sockaddr_in a;
cp
- if(debug_lvl > 0)
- syslog(LOG_DEBUG, _("Opening UDP socket to %s"), cl->real_hostname);
+ 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)
a.sin_family = AF_INET;
a.sin_port = htons(cl->port);
- a.sin_addr.s_addr = htonl(cl->real_ip);
+ 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->real_hostname, cl->port);
+ 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"), __FILE__, __LINE__, nfd);
+ syslog(LOG_ERR, _("This is a bug: %s:%d: %d:%m %s (%s)"), __FILE__, __LINE__, nfd,
+ cl->name, cl->hostname);
return -1;
}
if(getpeername(sfd, &ci, &len) < 0)
{
- syslog(LOG_ERR, _("Error: getpeername: %m"));
+ syslog(LOG_ERR, _("System call `%s' failed: %m"),
+ "getpeername");
return NULL;
}
- p->vpn_hostname = _("unknown");
- p->real_ip = ntohl(ci.sin_addr.s_addr);
- p->real_hostname = hostlookup(ci.sin_addr.s_addr);
+ p->name = unknown;
+ p->address = ntohl(ci.sin_addr.s_addr);
+ p->hostname = hostlookup(ci.sin_addr.s_addr);
p->meta_socket = sfd;
p->status.meta = 1;
+ p->buffer = xmalloc(MAXBUFSIZE);
p->buflen = 0;
p->last_ping_time = time(NULL);
- p->want_ping = 0;
- if(debug_lvl > 0)
+ if(debug_lvl >= DEBUG_CONNECTIONS)
syslog(LOG_NOTICE, _("Connection from %s port %d"),
- p->real_hostname, htons(ci.sin_port));
+ p->hostname, htons(ci.sin_port));
- if(send_basic_info(p) < 0)
- {
- free(p);
- return NULL;
- }
+ p->allow_request = ID;
cp
return p;
}
udp socket and write it to the ethertap
device after being decrypted
*/
-int handle_incoming_vpn_data(conn_list_t *cl)
+int handle_incoming_vpn_data()
{
- real_packet_t rp;
- int lenin;
+ vpn_packet_t pkt;
int x, l = sizeof(x);
- conn_list_t *f;
+ struct sockaddr from;
+ int lenin;
+ socklen_t fromlen = sizeof(from);
cp
- if(getsockopt(cl->socket, SOL_SOCKET, SO_ERROR, &x, &l) < 0)
+ if(getsockopt(myself->socket, SOL_SOCKET, SO_ERROR, &x, &l) < 0)
{
- syslog(LOG_ERR, _("This is a bug: %s:%d: %d:%m"), __FILE__, __LINE__, cl->socket);
+ syslog(LOG_ERR, _("This is a bug: %s:%d: %d:%m"),
+ __FILE__, __LINE__, myself->socket);
return -1;
}
if(x)
{
- syslog(LOG_ERR, _("Incoming data socket error: %s"), sys_errlist[x]);
+ syslog(LOG_ERR, _("Incoming data socket error: %s"), strerror(x));
return -1;
}
- rp.len = -1;
- lenin = recvfrom(cl->socket, &rp, MTU, 0, NULL, NULL);
- if(lenin <= 0)
+ if((lenin = recvfrom(myself->socket, (char *) &(pkt.len), MTU, 0, &from, &fromlen)) <= 0)
{
- syslog(LOG_ERR, _("Receiving packet from %s failed: %m"), cl->real_hostname);
+ syslog(LOG_ERR, _("Receiving packet 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)
+ if(debug_lvl >= DEBUG_TRAFFIC)
{
- f = lookup_conn(rp.from);
- if(!f)
- {
- syslog(LOG_ERR, _("Got packet from %s (%s) with unknown origin %d.%d.%d.%d?"),
- cl->vpn_hostname, cl->real_hostname, 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);
- }
+ syslog(LOG_DEBUG, _("Received packet of %d bytes"), lenin);
+ }
- if(my_key_expiry <= time(NULL))
- regenerate_keys();
- }
cp
- return 0;
+ return xrecv(&pkt);
}
/*
*/
void terminate_connection(conn_list_t *cl)
{
- conn_list_t *p, *q;
-
+ conn_list_t *p;
+ subnet_t *s;
cp
if(cl->status.remove)
return;
- if(debug_lvl > 0)
+ cl->status.remove = 1;
+
+ if(debug_lvl >= DEBUG_CONNECTIONS)
syslog(LOG_NOTICE, _("Closing connection with %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
+ cl->name, cl->hostname);
+
+ if(cl->socket)
+ close(cl->socket);
+ if(cl->status.meta)
+ close(cl->meta_socket);
- if(cl->status.timeout)
- send_timeout(cl);
- else if(!cl->status.termreq)
- send_termreq(cl);
+cp
+ /* Find all connections that were lost because they were behind cl
+ (the connection that was dropped). */
- close(cl->socket);
if(cl->status.meta)
- close(cl->meta_socket);
+ for(p = conn_list; p != NULL; p = p->next)
+ if((p->nexthop == cl) && (p != cl))
+ terminate_connection(p); /* Sounds like recursion, but p does not have a meta connection :) */
- if(cl->status.outgoing)
+ /* Inform others of termination if it was still active */
+
+ 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);
+
+ /* Remove the associated subnets */
+
+ for(s = cl->subnets; s; s = s->next)
+ subnet_del(s);
+
+ /* Check if this was our outgoing connection */
+
+ if(cl->status.outgoing && cl->status.active)
{
signal(SIGALRM, sigalrm_handler);
seconds_till_retry = 5;
alarm(seconds_till_retry);
syslog(LOG_NOTICE, _("Trying to re-establish outgoing connection in 5 seconds"));
}
-
- cl->status.remove = 1;
- /* If this cl isn't active, don't send any DEL_HOSTs. */
- if(!cl->status.active)
- return;
-
+ /* Inactivate */
+
cl->status.active = 0;
- notify_others(cl,NULL,send_del_host);
-
-cp
- /* Find all connections that were lost because they were behind cl
- (the connection that was dropped). */
- if(cl->status.meta)
- for(p = conn_list; p != NULL; p = p->next)
- {
- if(p->nexthop == cl)
- {
- if(p->status.active)
- notify_others(p,cl,send_del_host);
- p->status.active = 0;
- p->status.remove = 1;
- }
- }
-
-cp
- /* Then send a notification about all these connections to all hosts
- that are still connected to us.
- for(p = conn_list; p != NULL; p = p->next)
- if(p->status.active && p->status.meta)
- for(q = conn_list; q != NULL; q = q->next)
- if(q->status.remove)
- send_del_host(p, q);
- */
cp
}
now = time(NULL);
for(p = conn_list; p != NULL; p = p->next)
{
- if(p->status.remove)
- continue;
if(p->status.active && p->status.meta)
{
if(p->last_ping_time + timeout < now)
{
- if(p->status.pinged && !p->status.got_pong)
+ if(p->status.pinged)
{
- if(debug_lvl > 1)
+ if(debug_lvl >= DEBUG_PROTOCOL)
syslog(LOG_INFO, _("%s (%s) didn't respond to PING"),
- p->vpn_hostname, p->real_hostname);
+ p->name, p->hostname);
p->status.timeout = 1;
terminate_connection(p);
}
- else if(p->want_ping)
+ else
{
send_ping(p);
- p->last_ping_time = now;
- p->status.pinged = 1;
- p->status.got_pong = 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;
struct sockaddr client;
int nfd, len = sizeof(client);
cp
- if((nfd = accept(cl->meta_socket, &client, &len)) < 0)
+ if((nfd = accept(myself->meta_socket, &client, &len)) < 0)
{
syslog(LOG_ERR, _("Accepting a new connection failed: %m"));
return -1;
}
- if((ncn = create_new_connection(nfd)) == NULL)
+ if(!(ncn = create_new_connection(nfd)))
{
shutdown(nfd, 2);
close(nfd);
return 0;
}
- ncn->status.meta = 1;
- ncn->next = conn_list;
- conn_list = ncn;
-cp
- return 0;
-}
-
-/*
- dispatch any incoming meta requests
-*/
-int handle_incoming_meta_data(conn_list_t *cl)
-{
- int x, l = sizeof(x);
- int request, oldlen, i;
- int lenin = 0;
+ conn_list_add(ncn);
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(cl->buflen >= MAXBUFSIZE)
- {
- syslog(LOG_ERR, _("Metadata read buffer overflow!"));
- return -1;
- }
-
- lenin = read(cl->meta_socket, cl->buffer, MAXBUFSIZE-cl->buflen);
-
- if(lenin<=0)
- {
- if(errno==EINTR)
- return 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(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(debug_lvl > 2)
- syslog(LOG_DEBUG, _("Got request from %s (%s): %s"),
- cl->vpn_hostname, cl->real_hostname, cl->buffer);
- if(sscanf(cl->buffer, "%d", &request) == 1)
- {
- if((request < 0) || (request > 255) || (request_handlers[request] == NULL))
- {
- syslog(LOG_ERR, _("Unknown request from %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
- return -1;
- }
-
- if(request_handlers[request](cl)) /* Something went wrong. Probably scriptkiddies. Terminate. */
- {
- syslog(LOG_ERR, _("Error while processing request from %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
- return -1;
- }
- }
- else
- {
- syslog(LOG_ERR, _("Bogus data received from %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
- return -1;
- }
-
- 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;
}
*/
getsockopt(p->socket, SOL_SOCKET, SO_ERROR, &x, &l);
syslog(LOG_ERR, _("Outgoing data socket error for %s (%s): %s"),
- p->vpn_hostname, p->real_hostname, sys_errlist[x]);
+ p->name, p->hostname, strerror(x));
terminate_connection(p);
return;
}
if(p->status.meta)
if(FD_ISSET(p->meta_socket, f))
- if(handle_incoming_meta_data(p) < 0)
+ if(receive_meta(p) < 0)
{
terminate_connection(p);
return;
}
if(FD_ISSET(myself->socket, f))
- handle_incoming_vpn_data(myself);
+ handle_incoming_vpn_data();
if(FD_ISSET(myself->meta_socket, f))
- handle_new_meta_connection(myself);
+ handle_new_meta_connection();
cp
}
void handle_tap_input(void)
{
vpn_packet_t vp;
- ip_t from, to;
- int ether_type, lenin;
+ int lenin;
cp
- memset(&vp, 0, sizeof(vp));
- if((lenin = read(tap_fd, &vp, MTU)) <= 0)
+ if(taptype == TAP_TYPE_TUNTAP)
{
- syslog(LOG_ERR, _("Error while reading from tapdevice: %m"));
- return;
+ 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;
- ether_type = ntohs(*((unsigned short*)(&vp.data[12])));
- if(ether_type != 0x0800)
- {
- if(debug_lvl > 3)
- syslog(LOG_INFO, _("Non-IP ethernet frame %04x from " MAC_ADDR_S),
- ether_type, MAC_ADDR_V(vp.data[6]));
- return;
- }
-
if(lenin < 32)
{
- if(debug_lvl > 3)
- syslog(LOG_INFO, _("Dropping short packet"));
+ if(debug_lvl >= DEBUG_TRAFFIC)
+ syslog(LOG_WARNING, _("Received short packet from tap device"));
return;
}
- from = ntohl(*((unsigned long*)(&vp.data[26])));
- to = ntohl(*((unsigned long*)(&vp.data[30])));
-
- vp.len = (length_t)lenin - 2;
-
- strip_mac_addresses(&vp);
+ if(debug_lvl >= DEBUG_TRAFFIC)
+ {
+ syslog(LOG_DEBUG, _("Read packet of length %d from tap device"), vp.len);
+ }
- send_packet(to, &vp);
+ send_packet(ntohl(*((unsigned long*)(&vp.data[30]))), &vp);
cp
}
struct timeval tv;
int r;
time_t last_ping_check;
+ int t;
cp
last_ping_check = time(NULL);
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();
+ clear_config(&config);
+
+ if(read_server_config())
+ {
+ syslog(LOG_ERR, _("Unable to reread configuration file, exiting"));
+ exit(0);
+ }
+
+ sleep(5);
+
+ if(setup_network_connections())
+ return;
+
+ continue;
}
- if(last_ping_check + timeout < time(NULL))
- /* Let's check if everybody is still alive */
+ t = time(NULL);
+
+ /* Let's check if everybody is still alive */
+
+ if(last_ping_check + timeout < t)
{
check_dead_connections();
last_ping_check = time(NULL);
- continue;
+
+ /* Should we regenerate our key? */
+
+ if(keyexpires < t)
+ {
+ if(debug_lvl >= DEBUG_STATUS)
+ syslog(LOG_INFO, _("Regenerating symmetric key"));
+
+ RAND_bytes(myself->cipher_pktkey, myself->cipher_pktkeylength);
+ send_key_changed(myself, NULL);
+ keyexpires = time(NULL) + keylifetime;
+ }
}
- 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(tap_fd, &fset))
+ handle_tap_input();
+ }
}
cp
}
projects / oweals / tinc.git / blobdiff