along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- $Id: net.c,v 1.35.4.152 2002/02/10 21:57:54 guus Exp $
+ $Id: net.c,v 1.35.4.162 2002/03/11 11:23:04 guus Exp $
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <signal.h>
-#include <sys/signal.h>
#include <sys/time.h>
#include <sys/types.h>
#include <syslog.h>
#include <net/if.h>
#include <openssl/rand.h>
-#include <openssl/evp.h>
-#include <openssl/pem.h>
-#include <openssl/hmac.h>
-#ifndef HAVE_RAND_PSEUDO_BYTES
-#define RAND_pseudo_bytes RAND_bytes
-#endif
-
-#include <utils.h>
-#include <xalloc.h>
-#include <avl_tree.h>
-#include <list.h>
-
-#include "conf.h"
-#include "connection.h"
-#include "meta.h"
-#include "net.h"
-#include "netutl.h"
-#include "process.h"
-#include "protocol.h"
-#include "subnet.h"
-#include "graph.h"
-#include "process.h"
-#include "route.h"
-#include "device.h"
-#include "event.h"
-
-#include "system.h"
-
-int maxtimeout = 900;
-int seconds_till_retry = 5;
-
-int tcp_socket = -1;
-int udp_socket = -1;
-
-int keylifetime = 0;
-int keyexpires = 0;
-
-int do_prune = 0;
-int do_purge = 0;
-int sighup = 0;
-int sigalrm = 0;
-
-#define MAX_SEQNO 1073741824
-
-/* VPN packet I/O */
-
-void receive_udppacket(node_t *n, vpn_packet_t *inpkt)
-{
- vpn_packet_t outpkt;
- int outlen, outpad;
- EVP_CIPHER_CTX ctx;
- char hmac[EVP_MAX_MD_SIZE];
-cp
-
- if(myself->digest && myself->maclength)
- {
- inpkt->len -= myself->maclength;
- HMAC(myself->digest, myself->key, myself->keylength, (char *)&inpkt->seqno, inpkt->len, hmac, NULL);
- if(memcmp(hmac, (char *)&inpkt->seqno + inpkt->len, myself->maclength))
- {
- syslog(LOG_DEBUG, _("Got unauthenticated packet from %s (%s)"), n->name, n->hostname);
- return;
- }
- }
-
- /* Decrypt the packet */
-
- if(myself->cipher)
- {
- EVP_DecryptInit(&ctx, myself->cipher, myself->key, myself->key + myself->cipher->key_len);
- EVP_DecryptUpdate(&ctx, (char *)&outpkt.seqno, &outlen, (char *)&inpkt->seqno, inpkt->len);
- EVP_DecryptFinal(&ctx, (char *)&outpkt.seqno + outlen, &outpad);
- outlen += outpad;
- outpkt.len = outlen - sizeof(outpkt.seqno);
- }
- else
- {
- memcpy((char *)&outpkt.seqno, (char *)&inpkt->seqno, inpkt->len);
- outpkt.len = inpkt->len - sizeof(outpkt.seqno);
- }
-
- if (ntohl(outpkt.seqno) <= n->received_seqno)
- {
- syslog(LOG_DEBUG, _("Got late or replayed packet from %s (%s), seqno %d"), n->name, n->hostname, ntohl(*(unsigned int *)&outpkt.seqno));
- return;
- }
-
- n->received_seqno = ntohl(outpkt.seqno);
-
- if(n->received_seqno > MAX_SEQNO)
- keyexpires = 0;
-
- receive_packet(n, &outpkt);
-cp
-}
-
-void receive_tcppacket(connection_t *c, char *buffer, int len)
-{
- vpn_packet_t outpkt;
-cp
- outpkt.len = len;
- memcpy(outpkt.data, buffer, len);
-
- receive_packet(c->node, &outpkt);
-cp
-}
-
-void receive_packet(node_t *n, vpn_packet_t *packet)
-{
-cp
- if(debug_lvl >= DEBUG_TRAFFIC)
- syslog(LOG_DEBUG, _("Received packet of %d bytes from %s (%s)"), packet->len, n->name, n->hostname);
-
- route_incoming(n, packet);
-cp
-}
-
-void send_udppacket(node_t *n, vpn_packet_t *inpkt)
-{
- 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(!n->status.validkey)
- {
- if(debug_lvl >= DEBUG_TRAFFIC)
- syslog(LOG_INFO, _("No valid key known yet for %s (%s), queueing packet"),
- n->name, n->hostname);
-
- /* Since packet is on the stack of handle_tap_input(),
- we have to make a copy of it first. */
-
- copy = xmalloc(sizeof(vpn_packet_t));
- memcpy(copy, inpkt, sizeof(vpn_packet_t));
-
- list_insert_tail(n->queue, copy);
-
- if(!n->status.waitingforkey)
- send_req_key(n->nexthop->connection, myself, n);
- return;
- }
-
- /* Encrypt the packet. */
-
- inpkt->seqno = htonl(++(n->sent_seqno));
-
- if(n->cipher)
- {
- EVP_EncryptInit(&ctx, n->cipher, n->key, n->key + n->cipher->key_len);
- EVP_EncryptUpdate(&ctx, (char *)&outpkt.seqno, &outlen, (char *)&inpkt->seqno, inpkt->len + sizeof(inpkt->seqno));
- EVP_EncryptFinal(&ctx, (char *)&outpkt.seqno + outlen, &outpad);
- outlen += outpad;
- }
- else
- {
- memcpy((char *)&outpkt.seqno, (char *)&inpkt->seqno, inpkt->len + sizeof(inpkt->seqno));
- outlen = inpkt->len + sizeof(inpkt->seqno);
- }
-
- if(n->digest && n->maclength)
- {
- HMAC(n->digest, n->key, n->keylength, (char *)&outpkt.seqno, outlen, (char *)&outpkt.seqno + outlen, &outpad);
- outlen += n->maclength;
- }
-
- to.sin_family = AF_INET;
- to.sin_addr.s_addr = htonl(n->address);
- to.sin_port = htons(n->port);
-
- if((sendto(udp_socket, (char *)&outpkt.seqno, outlen, 0, (const struct sockaddr *)&to, tolen)) < 0)
- {
- syslog(LOG_ERR, _("Error sending packet to %s (%s): %m"),
- n->name, n->hostname);
- return;
- }
-cp
-}
-
-/*
- send a packet to the given vpn ip.
-*/
-void send_packet(node_t *n, vpn_packet_t *packet)
-{
- node_t *via;
-cp
- if(debug_lvl >= DEBUG_TRAFFIC)
- syslog(LOG_ERR, _("Sending packet of %d bytes to %s (%s)"),
- packet->len, n->name, n->hostname);
-
- if(n == myself)
- {
- if(debug_lvl >= DEBUG_TRAFFIC)
- {
- syslog(LOG_NOTICE, _("Packet is looping back to us!"));
- }
-
- return;
- }
-
- if(!n->status.reachable)
- {
- if(debug_lvl >= DEBUG_TRAFFIC)
- syslog(LOG_INFO, _("Node %s (%s) is not reachable"),
- n->name, n->hostname);
- return;
- }
-
- via = (n->via == myself)?n->nexthop:n->via;
-
- if(via != n && debug_lvl >= DEBUG_TRAFFIC)
- syslog(LOG_ERR, _("Sending packet to %s via %s (%s)"),
- n->name, via->name, n->via->hostname);
-
- if((myself->options | via->options) & OPTION_TCPONLY)
- {
- if(send_tcppacket(via->connection, packet))
- terminate_connection(via->connection, 1);
- }
- else
- send_udppacket(via, packet);
-}
-
-/* Broadcast a packet using the minimum spanning tree */
-
-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)
- {
- c = (connection_t *)node->data;
- if(c->status.active && c->status.mst && c != from->nexthop->connection)
- send_packet(c->node, packet);
- }
-cp
-}
-
-void flush_queue(node_t *n)
-{
- list_node_t *node, *next;
-cp
- if(debug_lvl >= DEBUG_TRAFFIC)
- syslog(LOG_INFO, _("Flushing queue for %s (%s)"), n->name, n->hostname);
-
- for(node = n->queue->head; node; node = next)
- {
- next = node->next;
- send_udppacket(n, (vpn_packet_t *)node->data);
- list_delete_node(n->queue, node);
- }
-cp
-}
-
-/* Setup sockets */
-
-int setup_listen_socket(port_t port)
-{
- int nfd, flags;
- struct sockaddr_in a;
- int option;
- ipv4_t *address;
-#ifdef HAVE_LINUX
- char *interface;
-#endif
-cp
- if((nfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
- {
- syslog(LOG_ERR, _("Creating metasocket failed: %m"));
- return -1;
- }
-
- flags = fcntl(nfd, F_GETFL);
- if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0)
- {
- close(nfd);
- syslog(LOG_ERR, _("System call `%s' failed: %m"),
- "fcntl");
- return -1;
- }
-
- /* Optimize TCP settings */
-
- option = 1;
- setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option));
- setsockopt(nfd, SOL_SOCKET, SO_KEEPALIVE, &option, sizeof(option));
-#ifdef HAVE_LINUX
- setsockopt(nfd, SOL_TCP, TCP_NODELAY, &option, sizeof(option));
-
- option = IPTOS_LOWDELAY;
- setsockopt(nfd, SOL_IP, IP_TOS, &option, sizeof(option));
-
- if(get_config_string(lookup_config(config_tree, "BindToInterface"), &interface))
- if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, interface, strlen(interface)))
- {
- close(nfd);
- syslog(LOG_ERR, _("Can't bind to interface %s: %m"), interface);
- return -1;
- }
-#endif
-
- memset(&a, 0, sizeof(a));
- a.sin_family = AF_INET;
- a.sin_addr.s_addr = htonl(INADDR_ANY);
- a.sin_port = htons(port);
-
- if(get_config_address(lookup_config(config_tree, "BindToAddress"), &address))
- {
- a.sin_addr.s_addr = htonl(*address);
- free(address);
- }
-
- if(bind(nfd, (struct sockaddr *)&a, sizeof(struct sockaddr)))
- {
- close(nfd);
- syslog(LOG_ERR, _("Can't bind to port %hd/tcp: %m"), port);
- return -1;
- }
-
- if(listen(nfd, 3))
- {
- close(nfd);
- syslog(LOG_ERR, _("System call `%s' failed: %m"),
- "listen");
- return -1;
- }
-cp
- return nfd;
-}
-
-int setup_vpn_in_socket(port_t port)
-{
- int nfd, flags;
- struct sockaddr_in a;
- const int one = 1;
-cp
- if((nfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
- {
- close(nfd);
- syslog(LOG_ERR, _("Creating socket failed: %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)
- {
- close(nfd);
- syslog(LOG_ERR, _("System call `%s' failed: %m"),
- "fcntl");
- return -1;
- }
-
- memset(&a, 0, sizeof(a));
- a.sin_family = AF_INET;
- a.sin_port = htons(port);
- a.sin_addr.s_addr = htonl(INADDR_ANY);
-
- if(bind(nfd, (struct sockaddr *)&a, sizeof(struct sockaddr)))
- {
- close(nfd);
- syslog(LOG_ERR, _("Can't bind to port %hd/udp: %m"), port);
- return -1;
- }
-cp
- return nfd;
-}
-
-void retry_outgoing(outgoing_t *outgoing)
-{
- event_t *event;
-cp
- outgoing->timeout += 5;
- if(outgoing->timeout > maxtimeout)
- outgoing->timeout = maxtimeout;
-
- event = new_event();
- event->handler = (event_handler_t)setup_outgoing_connection;
- event->time = time(NULL) + outgoing->timeout;
- event->data = outgoing;
- event_add(event);
-
- if(debug_lvl >= DEBUG_CONNECTIONS)
- syslog(LOG_NOTICE, _("Trying to re-establish outgoing connection in %d seconds"), outgoing->timeout);
-cp
-}
-
-int setup_outgoing_socket(connection_t *c)
-{
- int flags;
- struct sockaddr_in a;
-cp
- 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);
-
- if(c->socket == -1)
- {
- 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(0);
- a.sin_addr.s_addr = htonl(INADDR_ANY);
-
- if(bind(c->socket, (struct sockaddr *)&a, sizeof(struct sockaddr)))
- {
- close(c->socket);
- syslog(LOG_ERR, _("System call `%s' failed: %m"), "bind");
- return -1;
- }
-
- */
-
- /* Optimize TCP settings?
-
- option = 1;
- setsockopt(c->socket, SOL_SOCKET, SO_KEEPALIVE, &option, sizeof(option));
-#ifdef HAVE_LINUX
- setsockopt(c->socket, SOL_TCP, TCP_NODELAY, &option, sizeof(option));
-
- option = IPTOS_LOWDELAY;
- setsockopt(c->socket, SOL_IP, IP_TOS, &option, sizeof(option));
-#endif
-
- */
-
- /* Connect */
-
- a.sin_family = AF_INET;
- a.sin_port = htons(c->port);
- a.sin_addr.s_addr = htonl(c->address);
-
- if(connect(c->socket, (struct sockaddr *)&a, sizeof(a)) == -1)
- {
- close(c->socket);
- syslog(LOG_ERR, _("%s port %hd: %m"), c->hostname, c->port);
- return -1;
- }
-
- flags = fcntl(c->socket, F_GETFL);
-
- if(fcntl(c->socket, F_SETFL, flags | O_NONBLOCK) < 0)
- {
- close(c->socket);
- syslog(LOG_ERR, _("fcntl for %s port %d: %m"),
- c->hostname, c->port);
- return -1;
- }
-
- if(debug_lvl >= DEBUG_CONNECTIONS)
- syslog(LOG_INFO, _("Connected to %s port %hd"),
- c->hostname, c->port);
-cp
- return 0;
-}
-
-void setup_outgoing_connection(outgoing_t *outgoing)
-{
- connection_t *c;
- node_t *n;
- struct hostent *h;
-cp
- n = lookup_node(outgoing->name);
-
- if(n)
- if(n->connection)
- {
- if(debug_lvl >= DEBUG_CONNECTIONS)
- syslog(LOG_INFO, _("Already connected to %s"), outgoing->name);
- n->connection->outgoing = outgoing;
- return;
- }
-
- c = new_connection();
- c->name = xstrdup(outgoing->name);
-
- init_configuration(&c->config_tree);
- read_connection_config(c);
-
- if(!get_config_string(lookup_config(c->config_tree, "Address"), &c->hostname))
- {
- syslog(LOG_ERR, _("No address specified for %s"), c->name);
- free_connection(c);
- free(outgoing->name);
- free(outgoing);
- return;
- }
-
- if(!get_config_port(lookup_config(c->config_tree, "Port"), &c->port))
- c->port = 655;
-
- if(!(h = gethostbyname(c->hostname)))
- {
- syslog(LOG_ERR, _("Error looking up `%s': %m"), c->hostname);
- free_connection(c);
- retry_outgoing(outgoing);
- return;
- }
-
- 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);
- retry_outgoing(outgoing);
- return;
- }
-
- c->outgoing = outgoing;
- c->last_ping_time = time(NULL);
-
- connection_add(c);
-
- send_id(c);
-cp
-}
-
-int read_rsa_public_key(connection_t *c)
-{
- FILE *fp;
- char *fname;
- char *key;
-cp
- if(!c->rsa_key)
- c->rsa_key = RSA_new();
-
- /* First, check for simple PublicKey statement */
-
- if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &key))
- {
- BN_hex2bn(&c->rsa_key->n, key);
- BN_hex2bn(&c->rsa_key->e, "FFFF");
- return 0;
- }
-
- /* Else, check for PublicKeyFile statement and read it */
-
- 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;
- }
- c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
- fclose(fp);
- if(!c->rsa_key)
- {
- syslog(LOG_ERR, _("Reading RSA public key file `%s' failed: %m"),
- fname);
- return -1;
- }
- return 0;
- }
- else
- return -1;
- }
-
- /* Else, check if a harnessed public key is in the config file */
-
- asprintf(&fname, "%s/hosts/%s", confbase, c->name);
- if((fp = fopen(fname, "r")))
- {
- c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
- fclose(fp);
- }
-
- free(fname);
-
- if(c->rsa_key)
- return 0;
- else
- {
- syslog(LOG_ERR, _("No public key for %s specified!"), c->name);
- return -1;
- }
-}
-
-int read_rsa_private_key(void)
-{
- FILE *fp;
- char *fname, *key;
-cp
- if(get_config_string(lookup_config(config_tree, "PrivateKey"), &key))
- {
- myself->connection->rsa_key = RSA_new();
- 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;
- }
- myself->connection->rsa_key = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
- fclose(fp);
- if(!myself->connection->rsa_key)
- {
- syslog(LOG_ERR, _("Reading RSA private key file `%s' failed: %m"),
- fname);
- return -1;
- }
- }
- else
- {
- syslog(LOG_ERR, _("No private key for tinc daemon specified!"));
- return -1;
- }
-cp
- return 0;
-}
-
-/*
- Configure node_t myself and set up the local sockets (listen only)
-*/
-int setup_myself(void)
-{
- config_t *cfg;
- subnet_t *subnet;
- char *name, *mode, *cipher, *digest;
- int choice;
-cp
- myself = new_node();
- myself->connection = new_connection();
- init_configuration(&myself->connection->config_tree);
-
- asprintf(&myself->hostname, _("MYSELF"));
- asprintf(&myself->connection->hostname, _("MYSELF"));
-
- 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(read_connection_config(myself->connection))
- {
- syslog(LOG_ERR, _("Cannot open host configuration file for myself!"));
- return -1;
- }
-
- if(read_rsa_public_key(myself->connection))
- return -1;
-cp
-
-/*
- 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->port))
- myself->port = 655;
-
- myself->connection->port = myself->port;
-
-/* 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
- /* Check some options */
-
- if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice))
- if(choice)
- myself->options |= OPTION_INDIRECT;
-
- if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice))
- if(choice)
- myself->options |= OPTION_TCPONLY;
-
- if(get_config_bool(lookup_config(myself->connection->config_tree, "IndirectData"), &choice))
- if(choice)
- myself->options |= OPTION_INDIRECT;
-
- if(get_config_bool(lookup_config(myself->connection->config_tree, "TCPOnly"), &choice))
- if(choice)
- myself->options |= OPTION_TCPONLY;
-
- if(myself->options & OPTION_TCPONLY)
- myself->options |= OPTION_INDIRECT;
-
- if(get_config_string(lookup_config(config_tree, "Mode"), &mode))
- {
- 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)
- {
- 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 */
-
- if(get_config_string(lookup_config(myself->connection->config_tree, "Cipher"), &cipher))
- {
- if(!strcasecmp(cipher, "none"))
- {
- myself->cipher = NULL;
- }
- else
- {
- if(!(myself->cipher = EVP_get_cipherbyname(cipher)))
- {
- syslog(LOG_ERR, _("Unrecognized cipher type!"));
- return -1;
- }
- }
- }
- else
- myself->cipher = EVP_bf_cbc();
-
- if(myself->cipher)
- myself->keylength = myself->cipher->key_len + myself->cipher->iv_len;
- else
- myself->keylength = 1;
-
- myself->key = (char *)xmalloc(myself->keylength);
- RAND_pseudo_bytes(myself->key, myself->keylength);
-
- if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
- keylifetime = 3600;
-
- keyexpires = time(NULL) + keylifetime;
-
- /* Check if we want to use message authentication codes... */
-
- if(get_config_string(lookup_config(myself->connection->config_tree, "Digest"), &digest))
- {
- if(!strcasecmp(digest, "none"))
- {
- myself->digest = NULL;
- }
- else
- {
- if(!(myself->digest = EVP_get_digestbyname(digest)))
- {
- syslog(LOG_ERR, _("Unrecognized digest type!"));
- return -1;
- }
- }
- }
- else
- myself->digest = EVP_sha1();
-
- if(get_config_int(lookup_config(myself->connection->config_tree, "MACLength"), &myself->maclength))
- {
- if(myself->digest)
- {
- if(myself->maclength > myself->digest->md_size)
- {
- syslog(LOG_ERR, _("MAC length exceeds size of digest!"));
- return -1;
- }
- else if (myself->maclength < 0)
- {
- syslog(LOG_ERR, _("Bogus MAC length!"));
- return -1;
- }
- }
- }
- else
- myself->maclength = 4;
-cp
- /* Done */
-
- myself->nexthop = myself;
- myself->via = myself;
- myself->status.active = 1;
- node_add(myself);
-
- graph();
-
- syslog(LOG_NOTICE, _("Ready: listening on port %hd"), myself->port);
-cp
- return 0;
-}
-
-/*
- setup all initial network connections
-*/
-int setup_network_connections(void)
-{
-cp
- init_connections();
- init_subnets();
- init_nodes();
- init_edges();
- init_events();
-
- if(get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
- {
- if(pingtimeout < 1)
- {
- pingtimeout = 86400;
- }
- }
- else
- pingtimeout = 60;
-
- if(setup_device() < 0)
- return -1;
-
- /* Run tinc-up script to further initialize the tap interface */
- execute_script("tinc-up");
-
- if(setup_myself() < 0)
- return -1;
-
- try_outgoing_connections();
-cp
- return 0;
-}
-
-/*
- close all open network connections
-*/
-void close_network_connections(void)
-{
- avl_node_t *node, *next;
- connection_t *c;
-cp
- for(node = connection_tree->head; node; node = next)
- {
- next = node->next;
- c = (connection_t *)node->data;
- if(c->outgoing)
- free(c->outgoing->name), free(c->outgoing);
- terminate_connection(c, 0);
- }
-
- if(myself && myself->connection)
- terminate_connection(myself->connection, 0);
-
- close(udp_socket);
- close(tcp_socket);
-
- exit_events();
- exit_edges();
- exit_subnets();
- exit_nodes();
- exit_connections();
-
- execute_script("tinc-down");
-
- close_device();
-cp
- return;
-}
-
-/*
- handle an incoming tcp connect call and open
- a connection to it.
-*/
-connection_t *create_new_connection(int sfd)
-{
- connection_t *c;
- struct sockaddr_in ci;
- int len = sizeof(ci);
-cp
- c = new_connection();
+#include <utils.h>
+#include <xalloc.h>
+#include <avl_tree.h>
+#include <list.h>
- if(getpeername(sfd, (struct sockaddr *) &ci, (socklen_t *) &len) < 0)
- {
- syslog(LOG_ERR, _("System call `%s' failed: %m"),
- "getpeername");
- close(sfd);
- return NULL;
- }
+#include "conf.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"
- c->address = ntohl(ci.sin_addr.s_addr);
- c->hostname = hostlookup(ci.sin_addr.s_addr);
- c->port = htons(ci.sin_port);
- c->socket = sfd;
- c->last_ping_time = time(NULL);
+#include "system.h"
- if(debug_lvl >= DEBUG_CONNECTIONS)
- syslog(LOG_NOTICE, _("Connection from %s port %d"),
- c->hostname, c->port);
+int do_prune = 0;
+int do_purge = 0;
+int sighup = 0;
+int sigalrm = 0;
- c->allow_request = ID;
-cp
- return c;
-}
+time_t now = 0;
/*
put all file descriptors in an fd_set array
{
avl_node_t *node;
connection_t *c;
+ int i;
cp
FD_ZERO(fs);
FD_SET(c->socket, fs);
}
- FD_SET(tcp_socket, fs);
- FD_SET(udp_socket, fs);
- FD_SET(device_fd, fs);
-cp
-}
-
-/*
- receive incoming data from the listening
- udp socket and write it to the ethertap
- device after being decrypted
-*/
-void handle_incoming_vpn_data(void)
-{
- vpn_packet_t pkt;
- int x, l = sizeof(x);
- struct sockaddr_in from;
- socklen_t fromlen = sizeof(from);
- node_t *n;
-cp
- if(getsockopt(udp_socket, SOL_SOCKET, SO_ERROR, &x, &l) < 0)
- {
- 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"), strerror(x));
- return;
- }
-
- if((pkt.len = recvfrom(udp_socket, (char *)&pkt.seqno, MAXSIZE, 0, (struct sockaddr *)&from, &fromlen)) <= 0)
- {
- syslog(LOG_ERR, _("Receiving packet failed: %m"));
- return;
- }
-
- n = lookup_node_udp(ntohl(from.sin_addr.s_addr), ntohs(from.sin_port));
-
- if(!n)
+ for(i = 0; i < listen_sockets; i++)
{
- syslog(LOG_WARNING, _("Received UDP packet on port %hd from unknown source %x:%hd"), myself->port, ntohl(from.sin_addr.s_addr), ntohs(from.sin_port));
- return;
+ FD_SET(tcp_socket[i], fs);
+ FD_SET(udp_socket[i], fs);
}
-/*
- if(n->connection)
- n->connection->last_ping_time = time(NULL);
-*/
- receive_udppacket(n, &pkt);
+ FD_SET(device_fd, fs);
cp
}
for(snode = n->subnet_tree->head; snode; snode = snext)
{
snext = snode->next;
- s = (subnet_t *)snode->data;
-
- for(cnode = connection_tree->head; cnode; cnode = cnode->next)
- {
- c = (connection_t *)cnode->data;
- if(c->status.active)
- send_del_subnet(c, s);
- }
-
- subnet_del(n, s);
+ s = (subnet_t *)snode->data;
+
+ for(cnode = connection_tree->head; cnode; cnode = cnode->next)
+ {
+ c = (connection_t *)cnode->data;
+ if(c->status.active)
+ send_del_subnet(c, s);
+ }
+
+ subnet_del(n, s);
}
-
+
for(enode = n->edge_tree->head; enode; enode = enext)
{
enext = enode->next;
- e = (edge_t *)enode->data;
-
- for(cnode = connection_tree->head; cnode; cnode = cnode->next)
- {
- c = (connection_t *)cnode->data;
- if(c->status.active)
- send_del_edge(c, e);
- }
-
- edge_del(e);
+ e = (edge_t *)enode->data;
+
+ for(cnode = connection_tree->head; cnode; cnode = cnode->next)
+ {
+ c = (connection_t *)cnode->data;
+ if(c->status.active)
+ send_del_edge(c, e);
+ }
+
+ edge_del(e);
}
node_del(n);
}
- }
+ }
cp
}
cp
if(c->status.remove)
return;
-
+
if(debug_lvl >= DEBUG_CONNECTIONS)
syslog(LOG_NOTICE, _("Closing connection with %s (%s)"),
c->name, c->hostname);
c->status.remove = 1;
-
+
if(c->socket)
close(c->socket);
}
/* Run MST and SSSP algorithms */
-
+
graph();
/* Check if this was our outgoing connection */
*/
void check_dead_connections(void)
{
- time_t now;
avl_node_t *node, *next;
connection_t *c;
cp
- now = time(NULL);
-
for(node = connection_tree->head; node; node = next)
{
next = node->next;
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);
+ syslog(LOG_INFO, _("%s (%s) didn't respond to PING"),
+ c->name, c->hostname);
+ c->status.timeout = 1;
+ terminate_connection(c, 1);
}
else
{
cp
}
-/*
- accept a new tcp connect and create a
- new connection
-*/
-int handle_new_meta_connection()
-{
- connection_t *new;
- struct sockaddr client;
- int fd, len = sizeof(client);
-cp
- if((fd = accept(tcp_socket, &client, &len)) < 0)
- {
- syslog(LOG_ERR, _("Accepting a new connection failed: %m"));
- return -1;
- }
-
- if(!(new = create_new_connection(fd)))
- {
- shutdown(fd, 2);
- close(fd);
- syslog(LOG_NOTICE, _("Closed attempted connection"));
- return 0;
- }
-
- connection_add(new);
-
- send_id(new);
-cp
- return 0;
-}
-
-void try_outgoing_connections(void)
-{
- static config_t *cfg = NULL;
- char *name;
- outgoing_t *outgoing;
-cp
- for(cfg = lookup_config(config_tree, "ConnectTo"); cfg; cfg = lookup_config_next(config_tree, cfg))
- {
- get_config_string(cfg, &name);
-
- if(check_id(name))
- {
- syslog(LOG_ERR, _("Invalid name for outgoing connection in %s line %d"), cfg->file, cfg->line);
- free(name);
- continue;
- }
-
- outgoing = xmalloc_and_zero(sizeof(*outgoing));
- outgoing->name = name;
- setup_outgoing_connection(outgoing);
- }
-}
-
/*
check all connections to see if anything
happened on their sockets
{
connection_t *c;
avl_node_t *node;
+ int result, i;
+ int len = sizeof(result);
+ vpn_packet_t packet;
cp
- if(FD_ISSET(udp_socket, f))
- handle_incoming_vpn_data();
+ if(FD_ISSET(device_fd, f))
+ {
+ if(!read_packet(&packet))
+ route_outgoing(&packet);
+ }
+
+ for(i = 0; i < listen_sockets; i++)
+ {
+ if(FD_ISSET(udp_socket[i], f))
+ handle_incoming_vpn_data(udp_socket[i]);
+ if(FD_ISSET(tcp_socket[i], f))
+ handle_new_meta_connection(tcp_socket[i]);
+ }
for(node = connection_tree->head; node; node = node->next)
{
c = (connection_t *)node->data;
if(c->status.remove)
- return;
+ return;
if(FD_ISSET(c->socket, f))
- if(receive_meta(c) < 0)
- {
- terminate_connection(c, c->status.active);
- return;
- }
+ {
+ if(c->status.connecting)
+ {
+ c->status.connecting = 0;
+ getsockopt(c->socket, SOL_SOCKET, SO_ERROR, &result, &len);
+ if(!result)
+ finish_connecting(c);
+ else
+ {
+ if(debug_lvl >= DEBUG_CONNECTIONS)
+ syslog(LOG_DEBUG, _("Error while connecting to %s (%s): %s"), c->name, c->hostname, strerror(result));
+ close(c->socket);
+ do_outgoing_connection(c);
+ continue;
+ }
+ }
+ if(receive_meta(c) < 0)
+ {
+ terminate_connection(c, c->status.active);
+ return;
+ }
+ }
}
-
- if(FD_ISSET(tcp_socket, f))
- handle_new_meta_connection();
cp
}
c = (connection_t *)node->data;
if(c->status.remove)
- connection_del(c);
+ connection_del(c);
}
-
+
if(!connection_tree->head)
purge();
cp
time_t last_ping_check;
int t;
event_t *event;
- vpn_packet_t packet;
cp
- last_ping_check = time(NULL);
+ last_ping_check = now;
- srand(time(NULL));
+ srand(now);
for(;;)
{
+ now = time(NULL);
+
tv.tv_sec = 1 + (rand() & 7); /* Approx. 5 seconds, randomized to prevent global synchronisation effects */
tv.tv_usec = 0;
- if(do_prune)
- {
- prune_connections();
- do_prune = 0;
- }
-
build_fdset(&fset);
if((r = select(FD_SETSIZE, &fset, NULL, NULL, &tv)) < 0)
{
- if(errno != EINTR) /* because of a signal */
+ if(errno != EINTR) /* because of a signal */
{
- syslog(LOG_ERR, _("Error while waiting for input: %m"));
+ syslog(LOG_ERR, _("Error while waiting for input: %s"), strerror(errno));
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;
+ if(r > 0)
+ check_network_activity(&fset);
- continue;
+ if(do_prune)
+ {
+ prune_connections();
+ do_prune = 0;
}
- if(do_purge)
+ if(do_purge)
{
- purge();
- do_purge = 0;
- }
-
- t = time(NULL);
+ purge();
+ do_purge = 0;
+ }
/* Let's check if everybody is still alive */
- if(last_ping_check + pingtimeout < t)
- {
- check_dead_connections();
- last_ping_check = time(NULL);
+ if(last_ping_check + pingtimeout < now)
+ {
+ check_dead_connections();
+ last_ping_check = now;
+
+ if(routing_mode== RMODE_SWITCH)
+ age_mac();
/* Should we regenerate our key? */
- if(keyexpires < t)
+ 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 = time(NULL) + keylifetime;
+ 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;
+ while(event_tree->head)
+ {
+ event = (event_t *)event_tree->head->data;
+ event->handler(event->data);
+ event_del(event);
+ }
+ sigalrm = 0;
}
- while((event = get_expired_event()))
+ if(sighup)
{
- event->handler(event->data);
- free(event);
- }
+ sighup = 0;
+ close_network_connections();
+ exit_configuration(&config_tree);
- if(r > 0)
- {
- check_network_activity(&fset);
+ syslog(LOG_INFO, _("Rereading configuration file and restarting in 5 seconds..."));
+ sleep(5);
- /* local tap data */
- if(FD_ISSET(device_fd, &fset))
+ init_configuration(&config_tree);
+
+ if(read_server_config())
{
- if(!read_packet(&packet))
- route_outgoing(&packet);
+ syslog(LOG_ERR, _("Unable to reread configuration file, exitting."));
+ exit(1);
}
+
+ if(setup_network_connections())
+ return;
+
+ continue;
}
}
cp
projects / tinc / blobdiff