3 Copyright (C) 1998-2002 Ivo Timmermans <itimmermans@bigfoot.com>,
4 2000-2002 Guus Sliepen <guus@sliepen.warande.net>
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 $Id: net_setup.c,v 1.1.2.17 2002/06/08 12:57:10 guus Exp $
28 #include <netinet/in.h>
29 #ifdef HAVE_NETINET_IP_H
30 #include <netinet/ip.h>
32 #ifdef HAVE_NETINET_TCP_H
33 #include <netinet/tcp.h>
40 #include <sys/types.h>
43 #include <sys/ioctl.h>
44 /* SunOS really wants sys/socket.h BEFORE net/if.h,
45 and FreeBSD wants these lines below the rest. */
46 #include <arpa/inet.h>
47 #include <sys/socket.h>
50 #include <openssl/pem.h>
51 #include <openssl/rsa.h>
52 #include <openssl/rand.h>
60 #include "connection.h"
77 int read_rsa_public_key(connection_t *c)
84 c->rsa_key = RSA_new();
86 /* First, check for simple PublicKey statement */
88 if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &key))
90 BN_hex2bn(&c->rsa_key->n, key);
91 BN_hex2bn(&c->rsa_key->e, "FFFF");
96 /* Else, check for PublicKeyFile statement and read it */
98 if(get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
100 if(is_safe_path(fname))
102 if((fp = fopen(fname, "r")) == NULL)
104 syslog(LOG_ERR, _("Error reading RSA public key file `%s': %s"),
105 fname, strerror(errno));
110 c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
113 return 0; /* Woohoo. */
115 /* If it fails, try PEM_read_RSA_PUBKEY. */
116 if((fp = fopen(fname, "r")) == NULL)
118 syslog(LOG_ERR, _("Error reading RSA public key file `%s': %s"),
119 fname, strerror(errno));
124 c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
129 syslog(LOG_ERR, _("Reading RSA public key file `%s' failed: %s"),
130 fname, strerror(errno));
140 /* Else, check if a harnessed public key is in the config file */
142 asprintf(&fname, "%s/hosts/%s", confbase, c->name);
143 if((fp = fopen(fname, "r")))
145 c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
154 /* Try again with PEM_read_RSA_PUBKEY. */
156 asprintf(&fname, "%s/hosts/%s", confbase, c->name);
157 if((fp = fopen(fname, "r")))
159 c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
168 syslog(LOG_ERR, _("No public key for %s specified!"), c->name);
172 int read_rsa_private_key(void)
177 if(get_config_string(lookup_config(config_tree, "PrivateKey"), &key))
179 myself->connection->rsa_key = RSA_new();
180 BN_hex2bn(&myself->connection->rsa_key->d, key);
181 BN_hex2bn(&myself->connection->rsa_key->e, "FFFF");
186 if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
187 asprintf(&fname, "%s/rsa_key.priv", confbase);
189 if(is_safe_path(fname))
191 if((fp = fopen(fname, "r")) == NULL)
193 syslog(LOG_ERR, _("Error reading RSA private key file `%s': %s"),
194 fname, strerror(errno));
199 myself->connection->rsa_key = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
201 if(!myself->connection->rsa_key)
203 syslog(LOG_ERR, _("Reading RSA private key file `%s' failed: %s"),
204 fname, strerror(errno));
215 Configure node_t myself and set up the local sockets (listen only)
217 int setup_myself(void)
221 char *name, *hostname, *mode, *afname, *cipher, *digest;
222 char *address = NULL;
223 struct addrinfo hint, *ai, *aip;
227 myself->connection = new_connection();
228 init_configuration(&myself->connection->config_tree);
230 asprintf(&myself->hostname, _("MYSELF"));
231 asprintf(&myself->connection->hostname, _("MYSELF"));
233 myself->connection->options = 0;
234 myself->connection->protocol_version = PROT_CURRENT;
236 if(!get_config_string(lookup_config(config_tree, "Name"), &name)) /* Not acceptable */
238 syslog(LOG_ERR, _("Name for tinc daemon required!"));
244 syslog(LOG_ERR, _("Invalid name for myself!"));
250 myself->connection->name = xstrdup(name);
253 if(read_rsa_private_key())
256 if(read_connection_config(myself->connection))
258 syslog(LOG_ERR, _("Cannot open host configuration file for myself!"));
262 if(read_rsa_public_key(myself->connection))
266 if(!get_config_string(lookup_config(myself->connection->config_tree, "Port"), &myport))
267 asprintf(&myport, "655");
269 /* Read in all the subnets specified in the host configuration file */
271 cfg = lookup_config(myself->connection->config_tree, "Subnet");
275 if(!get_config_subnet(cfg, &subnet))
278 subnet_add(myself, subnet);
280 cfg = lookup_config_next(myself->connection->config_tree, cfg);
284 /* Check some options */
286 if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice))
288 myself->options |= OPTION_INDIRECT;
290 if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice))
292 myself->options |= OPTION_TCPONLY;
294 if(get_config_bool(lookup_config(myself->connection->config_tree, "IndirectData"), &choice))
296 myself->options |= OPTION_INDIRECT;
298 if(get_config_bool(lookup_config(myself->connection->config_tree, "TCPOnly"), &choice))
300 myself->options |= OPTION_TCPONLY;
302 if(myself->options & OPTION_TCPONLY)
303 myself->options |= OPTION_INDIRECT;
305 if(get_config_string(lookup_config(config_tree, "Mode"), &mode))
307 if(!strcasecmp(mode, "router"))
308 routing_mode = RMODE_ROUTER;
309 else if (!strcasecmp(mode, "switch"))
310 routing_mode = RMODE_SWITCH;
311 else if (!strcasecmp(mode, "hub"))
312 routing_mode = RMODE_HUB;
315 syslog(LOG_ERR, _("Invalid routing mode!"));
321 routing_mode = RMODE_ROUTER;
323 get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
324 #if !defined(SOL_IP) || !defined(IP_TOS)
325 if(priorityinheritance)
326 syslog(LOG_WARNING, _("PriorityInheritance not supported on this platform"));
329 if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
332 if(get_config_int(lookup_config(myself->connection->config_tree, "MaxTimeout"), &maxtimeout))
336 syslog(LOG_ERR, _("Bogus maximum timeout!"));
343 if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname))
345 if(!strcasecmp(afname, "IPv4"))
346 addressfamily = AF_INET;
347 else if (!strcasecmp(afname, "IPv6"))
348 addressfamily = AF_INET6;
349 else if (!strcasecmp(afname, "any"))
350 addressfamily = AF_UNSPEC;
353 syslog(LOG_ERR, _("Invalid address family!"));
359 addressfamily = AF_INET;
361 get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
363 /* Generate packet encryption key */
365 if(get_config_string(lookup_config(myself->connection->config_tree, "Cipher"), &cipher))
367 if(!strcasecmp(cipher, "none"))
369 myself->cipher = NULL;
373 if(!(myself->cipher = EVP_get_cipherbyname(cipher)))
375 syslog(LOG_ERR, _("Unrecognized cipher type!"));
381 myself->cipher = EVP_bf_cbc();
384 myself->keylength = myself->cipher->key_len + myself->cipher->iv_len;
386 myself->keylength = 1;
388 myself->connection->outcipher = EVP_bf_ofb();
390 myself->key = (char *)xmalloc(myself->keylength);
391 RAND_pseudo_bytes(myself->key, myself->keylength);
393 if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
396 keyexpires = now + keylifetime;
398 /* Check if we want to use message authentication codes... */
400 if(get_config_string(lookup_config(myself->connection->config_tree, "Digest"), &digest))
402 if(!strcasecmp(digest, "none"))
404 myself->digest = NULL;
408 if(!(myself->digest = EVP_get_digestbyname(digest)))
410 syslog(LOG_ERR, _("Unrecognized digest type!"));
416 myself->digest = EVP_sha1();
418 myself->connection->outdigest = EVP_sha1();
420 if(get_config_int(lookup_config(myself->connection->config_tree, "MACLength"), &myself->maclength))
424 if(myself->maclength > myself->digest->md_size)
426 syslog(LOG_ERR, _("MAC length exceeds size of digest!"));
429 else if (myself->maclength < 0)
431 syslog(LOG_ERR, _("Bogus MAC length!"));
437 myself->maclength = 4;
439 myself->connection->outmaclength = 0;
443 if(get_config_int(lookup_config(myself->connection->config_tree, "Compression"), &myself->compression))
445 if(myself->compression < 0 || myself->compression > 9)
447 syslog(LOG_ERR, _("Bogus compression level!"));
452 myself->compression = 0;
454 myself->connection->outcompression = 0;
458 myself->nexthop = myself;
459 myself->via = myself;
460 myself->status.active = 1;
461 myself->status.reachable = 1;
469 memset(&hint, 0, sizeof(hint));
471 get_config_string(lookup_config(config_tree, "BindToAddress"), &address);
473 hint.ai_family = addressfamily;
474 hint.ai_socktype = SOCK_STREAM;
475 hint.ai_protocol = IPPROTO_TCP;
476 hint.ai_flags = AI_PASSIVE;
478 if((err = getaddrinfo(address, myport, &hint, &ai)) || !ai)
480 syslog(LOG_ERR, _("System call `%s' failed: %s"), "getaddrinfo", gai_strerror(err));
484 for(aip = ai; aip; aip = aip->ai_next)
486 if((listen_socket[listen_sockets].tcp = setup_listen_socket((sockaddr_t *)aip->ai_addr)) < 0)
489 if((listen_socket[listen_sockets].udp = setup_vpn_in_socket((sockaddr_t *)aip->ai_addr)) < 0)
492 if(debug_lvl >= DEBUG_CONNECTIONS)
494 hostname = sockaddr2hostname((sockaddr_t *)aip->ai_addr);
495 syslog(LOG_NOTICE, _("Listening on %s"), hostname);
499 listen_socket[listen_sockets].sa.sa = *aip->ai_addr;
506 syslog(LOG_NOTICE, _("Ready"));
509 syslog(LOG_ERR, _("Unable to create any listening socket!"));
517 setup all initial network connections
519 int setup_network_connections(void)
531 if(get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
541 if(setup_device() < 0)
544 /* Run tinc-up script to further initialize the tap interface */
545 execute_script("tinc-up");
547 if(setup_myself() < 0)
550 try_outgoing_connections();
556 close all open network connections
558 void close_network_connections(void)
560 avl_node_t *node, *next;
564 for(node = connection_tree->head; node; node = next)
567 c = (connection_t *)node->data;
569 free(c->outgoing->name), free(c->outgoing), c->outgoing = NULL;
570 terminate_connection(c, 0);
573 if(myself && myself->connection)
574 terminate_connection(myself->connection, 0);
576 for(i = 0; i < listen_sockets; i++)
578 close(listen_socket[i].tcp);
579 close(listen_socket[i].udp);
589 execute_script("tinc-down");