-/*
- 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;
- config_t const *cfg;
-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, _("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, _("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);
-
- 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)))
- {
- syslog(LOG_ERR, _("Can't bind to port %hd/tcp: %m"), port);
- return -1;
- }
-
- if(listen(nfd, 3))
- {
- syslog(LOG_ERR, _("System call `%s' failed: %m"),
- "listen");
- return -1;
- }
-cp
- return nfd;
-}
-
-/*
- setup the socket for incoming encrypted
- data (the udp part)
-*/
-int setup_vpn_in_socket(int port)
-{
- int nfd, flags;
- 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, _("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, _("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)))
- {
- 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(debug_lvl >= DEBUG_CONNECTIONS)
- syslog(LOG_INFO, _("Trying to connect to %s"), cl->hostname);
-
- 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 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->address);
-
- if(connect(cl->meta_socket, (struct sockaddr *)&a, sizeof(a)) == -1)
- {
- 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 for %s port %d: %m"),
- cl->hostname, cl->port);
- return -1;
- }
-
- if(debug_lvl >= DEBUG_CONNECTIONS)
- syslog(LOG_INFO, _("Connected to %s port %hd"),
- cl->hostname, cl->port);
-
- cl->status.meta = 1;
-cp
- return 0;
-}
-
-/*
- setup an outgoing connection. It's not
- necessary to also open an udp socket as
- well, because the other host will initiate
- an authentication sequence during which
- we will do just that.
-*/
-int setup_outgoing_connection(char *name)
-{
- 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();
- 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->hostname);
- free_conn_list(ncn);
- return -1;
- }
-
- ncn->status.outgoing = 1;
- ncn->buffer = xmalloc(MAXBUFSIZE);
- ncn->buflen = 0;
- ncn->last_ping_time = time(NULL);
- ncn->want_ping = 0;
-
- conn_list_add(ncn);
-
- send_id(ncn);
-cp
- return 0;
-}
-
-/*
- 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();
-
- 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, _("Name for tinc daemon required!"));
- return -1;
- }
- else
- asprintf(&myself->name, "%s", (char*)cfg->data.val);
-
- 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(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(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!"));
- return -1;
- }
-
- if((myself->socket = setup_vpn_in_socket(myself->port)) < 0)
- {
- 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);
-cp
- return 0;
-}
-
-RETSIGTYPE
-sigalrm_handler(int a)
-{
- config_t const *cfg;
-cp
- cfg = get_config_val(upstreamcfg, connectto);
-
- if(!cfg && upstreamcfg == config)
- /* No upstream IP given, we're listen only. */
- return;
-
- while(cfg)
- {
- 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_config_val(upstreamcfg, connectto); /* Or else we try the next ConnectTo line */
- }
-
- signal(SIGALRM, sigalrm_handler);
- upstreamcfg = config;
- seconds_till_retry += 5;
- if(seconds_till_retry > MAXTIMEOUT) /* Don't wait more than MAXTIMEOUT seconds. */
- seconds_till_retry = MAXTIMEOUT;
- syslog(LOG_ERR, _("Still failed to connect to other, will retry in %d seconds"),
- seconds_till_retry);
- alarm(seconds_till_retry);
-cp
-}
-
-/*
- setup all initial network connections
-*/
-int setup_network_connections(void)
-{
- config_t const *cfg;
-cp
- if((cfg = get_config_val(config, pingtimeout)) == NULL)
- timeout = 5;
- else
- timeout = cfg->data.val;
-
- if(setup_tap_fd() < 0)
- return -1;
-
- if(setup_myself() < 0)
- return -1;
-
- /* Run tinc-up script to further initialize the tap interface */
- execute_script("tinc-up");
-
- if(!(cfg = get_config_val(config, connectto)))
- /* No upstream IP given, we're listen only. */
- return 0;
-
- while(cfg)
- {
- upstreamcfg = cfg->next;
- if(!setup_outgoing_connection(cfg->data.ptr)) /* function returns 0 when there are no problems */
- return 0;
- cfg = get_config_val(upstreamcfg, connectto); /* Or else we try the next ConnectTo line */
- }
-
- signal(SIGALRM, sigalrm_handler);
- upstreamcfg = config;
- seconds_till_retry = MAXTIMEOUT;
- syslog(LOG_NOTICE, _("Trying to re-establish outgoing connection in %d seconds"), seconds_till_retry);
- alarm(seconds_till_retry);
-cp
- return 0;
-}
-
-/*
- close all open network connections
-*/
-void close_network_connections(void)
-{
- conn_list_t *p;
-cp
- for(p = conn_list; p != NULL; p = p->next)
- {
- p->status.active = 0;
- terminate_connection(p);
- }
-
- if(myself)
- if(myself->status.active)