-#include "process.h"
-#include "route.h"
-#include "device.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;
-
-/* 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;
-cp
- /* Decrypt the packet */
-
- EVP_DecryptInit(&ctx, myself->cipher, myself->key, myself->key + myself->cipher->key_len);
- EVP_DecryptUpdate(&ctx, outpkt.salt, &outlen, inpkt->salt, inpkt->len);
- EVP_DecryptFinal(&ctx, outpkt.salt + outlen, &outpad);
- outlen += outpad;
- outpkt.len = outlen - sizeof(outpkt.salt);
-
- receive_packet(n, &outpkt);
-cp
-}
-
-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. */
-
- RAND_pseudo_bytes(inpkt->salt, sizeof(inpkt->salt));
-
- EVP_EncryptInit(&ctx, n->cipher, n->key, n->key + n->cipher->key_len);
- EVP_EncryptUpdate(&ctx, outpkt.salt, &outlen, inpkt->salt, inpkt->len + sizeof(inpkt->salt));
- EVP_EncryptFinal(&ctx, outpkt.salt + outlen, &outpad);
- outlen += outpad;
-
- 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.salt, 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)
-{
-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->via != n && debug_lvl >= DEBUG_TRAFFIC)
- syslog(LOG_ERR, _("Sending packet to %s via %s (%s)"),
- n->name, n->via->name, n->via->hostname);
-
- if((myself->options | n->via->options) & OPTION_TCPONLY)
- {
- if(send_tcppacket(n->via->connection, packet))
- terminate_connection(n->via->connection, 1);
- }
- else
- send_udppacket(n->via, packet);
-}
-
-/* Broadcast a packet to all active direct connections */
-
-void broadcast_packet(node_t *from, vpn_packet_t *packet)
-{
- avl_node_t *node;
- connection_t *c;
-cp
- if(debug_lvl >= DEBUG_TRAFFIC)
- syslog(LOG_INFO, _("Broadcasting packet of %d bytes from %s (%s)"),
- packet->len, from->name, from->hostname);
-
- for(node = connection_tree->head; node; node = node->next)
- {
- c = (connection_t *)node->data;
- if(c->status.active && 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(int port)
-{
- int nfd, flags;
- struct sockaddr_in a;
- int option;
- char *address;
- ip_mask_t *ipmask;
-#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_string(lookup_config(config_tree, "BindToAddress"), &address))
- {
- ipmask = strtoip(address);
- if(ipmask)
- {
- a.sin_addr.s_addr = htonl(ipmask->address);
- free(ipmask);
- }
- }
-
- if(bind(nfd, (struct sockaddr *)&a, sizeof(struct sockaddr)))
- {
- 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(int 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;
-}
-
-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 */
-
- if(connect(c->socket, c->address->ai_addr, c->address->ai_addrlen) == -1)
- {
- close(c->socket);
- syslog(LOG_ERR, _("%s port %s: %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 %s: %m"),
- c->hostname, c->port);
- return -1;
- }
-
- if(debug_lvl >= DEBUG_CONNECTIONS)
- syslog(LOG_INFO, _("Connected to %s port %s"),
- c->hostname, c->port);
-cp
- return 0;
-}
-
-int setup_outgoing_connection(char *name)
-{
- connection_t *c;
- node_t *n;
- struct addrinfo *ai, *aitop, hints;
- int r, ipv6preferred;
-
-cp
- n = lookup_node(name);
-
- if(n)
- if(n->connection)
- {
- if(debug_lvl >= DEBUG_CONNECTIONS)
- syslog(LOG_INFO, _("Already connected to %s"), name);
- return 0;
- }
-
- c = new_connection();
- c->name = xstrdup(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);
- return -1;
- }
-
- if(!get_config_string(lookup_config(c->config_tree, "Port"), &c->port))
- {
- syslog(LOG_ERR, _("No port specified for %s"), c->name);
- free_connection(c);
- return -1;
- }
-
- hints.ai_socktype = SOCK_STREAM;
- hints.ai_family = AF_INET;
- if(get_config_bool(lookup_config(c->config_tree, "IPv6Preferred"), &ipv6preferred))
- {
- if(ipv6preferred)
- hints.ai_family = PF_UNSPEC;
- }
-
- if((r = getaddrinfo(c->hostname, c->port, &hints, &aitop)) != 0)
- {
- syslog(LOG_ERR, _("Looking up %s failed: %s\n"),
- c->hostname, gai_strerror(r));
- return -1;
- }
-
- for(ai = aitop; ai != NULL; ai = ai->ai_next)
- {
- if(setup_outgoing_socket(c) < 0)
- continue;
- }
-
- if(ai == NULL)
- {
- /* No connection alternative succeeded */
- free_connection(c);
- return -1;
- }
-
- c->status.outgoing = 1;
- c->last_ping_time = time(NULL);
-
- connection_add(c);
-
- send_id(c);
-cp
- return 0;
-}
-
-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;
- 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 */
-
- myself->cipher = EVP_bf_cbc();
-
- myself->keylength = myself->cipher->key_len + myself->cipher->iv_len;
-
- myself->key = (char *)xmalloc(myself->keylength);
- RAND_pseudo_bytes(myself->key, myself->keylength);
-
- if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
- keylifetime = 3600;
-
- keyexpires = time(NULL) + keylifetime;
-cp
- /* Done */
-
- myself->nexthop = myself;
- myself->via = myself;
- myself->status.active = 1;
- node_add(myself);
-
- syslog(LOG_NOTICE, _("Ready: listening on port %hd"), myself->port);
-cp
- return 0;
-}
-
-/*
- setup all initial network connections
-*/
-int setup_network_connections(void)
-{
-cp
- init_connections();
- init_subnets();
- init_nodes();
- init_edges();
-
- if(get_config_int(lookup_config(config_tree, "PingTimeout"), &timeout))
- {
- if(timeout < 1)
- {
- timeout = 86400;
- }
- }
- else
- timeout = 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;
-
- signal(SIGALRM, try_outgoing_connections);
- alarm(5);
-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;
- c->status.outgoing = 0;
- terminate_connection(c, 0);
- }
-
- terminate_connection(myself->connection, 0);
-
- close(udp_socket);
- close(tcp_socket);
-
- exit_edges();
- exit_subnets();
- exit_nodes();
- exit_connections();
-
- execute_script("tinc-down");