X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fnet_setup.c;h=eec438a80879831b1a2416fbdeefa0a9cebf6328;hp=5a5564e9b15397831de10a42924cdff119cee5aa;hb=ae8c0b65d8f97942d7eff5f96344f781b8dec35d;hpb=eefa28059ab989c915a7d95fb4ae728abd7ce713

diff --git a/src/net_setup.c b/src/net_setup.c
index 5a5564e9..eec438a8 100644
--- a/src/net_setup.c
+++ b/src/net_setup.c
@@ -1,7 +1,9 @@
 /*
     net_setup.c -- Setup.
-    Copyright (C) 1998-2003 Ivo Timmermans <ivo@o2w.nl>,
-                  2000-2003 Guus Sliepen <guus@sliepen.eu.org>
+    Copyright (C) 1998-2005 Ivo Timmermans,
+                  2000-2012 Guus Sliepen <guus@tinc-vpn.org>
+                  2006      Scott Lamb <slamb@slamb.org>
+                  2010      Brandon Black <blblack@gmail.com>
 
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -13,11 +15,9 @@
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
 
-    You should have received a copy of the GNU General Public License
-    along with this program; if not, write to the Free Software
-    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
-    $Id: net_setup.c,v 1.1.2.37 2003/07/22 20:55:20 guus Exp $
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
 #include "system.h"
@@ -25,6 +25,8 @@
 #include <openssl/pem.h>
 #include <openssl/rsa.h>
 #include <openssl/rand.h>
+#include <openssl/err.h>
+#include <openssl/evp.h>
 
 #include "avl_tree.h"
 #include "conf.h"
@@ -43,15 +45,19 @@
 #include "xalloc.h"
 
 char *myport;
+devops_t devops;
+
+char *proxyhost;
+char *proxyport;
+char *proxyuser;
+char *proxypass;
+proxytype_t proxytype;
 
-bool read_rsa_public_key(connection_t *c)
-{
+bool read_rsa_public_key(connection_t *c) {
 	FILE *fp;
 	char *fname;
 	char *key;
 
-	cp();
-
 	if(!c->rsa_key) {
 		c->rsa_key = RSA_new();
 //		RSA_blinding_on(c->rsa_key, NULL);
@@ -72,7 +78,7 @@ bool read_rsa_public_key(connection_t *c)
 		fp = fopen(fname, "r");
 
 		if(!fp) {
-			logger(LOG_ERR, _("Error reading RSA public key file `%s': %s"),
+			logger(LOG_ERR, "Error reading RSA public key file `%s': %s",
 				   fname, strerror(errno));
 			free(fname);
 			return false;
@@ -89,7 +95,7 @@ bool read_rsa_public_key(connection_t *c)
 		fp = fopen(fname, "r");
 
 		if(!fp) {
-			logger(LOG_ERR, _("Error reading RSA public key file `%s': %s"),
+			logger(LOG_ERR, "Error reading RSA public key file `%s': %s",
 				   fname, strerror(errno));
 			free(fname);
 			return false;
@@ -104,21 +110,24 @@ bool read_rsa_public_key(connection_t *c)
 			return true;
 		}
 
-		logger(LOG_ERR, _("Reading RSA public key file `%s' failed: %s"),
+		logger(LOG_ERR, "Reading RSA public key file `%s' failed: %s",
 			   fname, strerror(errno));
 		return false;
 	}
 
 	/* Else, check if a harnessed public key is in the config file */
 
-	asprintf(&fname, "%s/hosts/%s", confbase, c->name);
+	xasprintf(&fname, "%s/hosts/%s", confbase, c->name);
 	fp = fopen(fname, "r");
 
-	if(fp) {
-		c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
-		fclose(fp);
+	if(!fp) {
+		logger(LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
+		free(fname);
+		return false;
 	}
 
+	c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
+	fclose(fp);
 	free(fname);
 
 	if(c->rsa_key)
@@ -126,129 +135,303 @@ bool read_rsa_public_key(connection_t *c)
 
 	/* Try again with PEM_read_RSA_PUBKEY. */
 
-	asprintf(&fname, "%s/hosts/%s", confbase, c->name);
+	xasprintf(&fname, "%s/hosts/%s", confbase, c->name);
 	fp = fopen(fname, "r");
 
-	if(fp) {
-		c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
-//		RSA_blinding_on(c->rsa_key, NULL);
-		fclose(fp);
+	if(!fp) {
+		logger(LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
+		free(fname);
+		return false;
 	}
 
+	c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
+//	RSA_blinding_on(c->rsa_key, NULL);
+	fclose(fp);
 	free(fname);
 
 	if(c->rsa_key)
 		return true;
 
-	logger(LOG_ERR, _("No public key for %s specified!"), c->name);
+	logger(LOG_ERR, "No public key for %s specified!", c->name);
 
 	return false;
 }
 
-bool read_rsa_private_key(void)
-{
+static bool read_rsa_private_key(void) {
 	FILE *fp;
-	char *fname, *key;
-
-	cp();
+	char *fname, *key, *pubkey;
+	struct stat s;
 
 	if(get_config_string(lookup_config(config_tree, "PrivateKey"), &key)) {
+		if(!get_config_string(lookup_config(config_tree, "PublicKey"), &pubkey)) {
+			logger(LOG_ERR, "PrivateKey used but no PublicKey found!");
+			return false;
+		}
 		myself->connection->rsa_key = RSA_new();
 //		RSA_blinding_on(myself->connection->rsa_key, NULL);
 		BN_hex2bn(&myself->connection->rsa_key->d, key);
+		BN_hex2bn(&myself->connection->rsa_key->n, pubkey);
 		BN_hex2bn(&myself->connection->rsa_key->e, "FFFF");
 		free(key);
+		free(pubkey);
 		return true;
 	}
 
 	if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
-		asprintf(&fname, "%s/rsa_key.priv", confbase);
+		xasprintf(&fname, "%s/rsa_key.priv", confbase);
 
-	if(is_safe_path(fname)) {
-		fp = fopen(fname, "r");
+	fp = fopen(fname, "r");
 
-		if(!fp) {
-			logger(LOG_ERR, _("Error reading RSA private key file `%s': %s"),
-				   fname, strerror(errno));
-			free(fname);
-			return false;
-		}
+	if(!fp) {
+		logger(LOG_ERR, "Error reading RSA private key file `%s': %s",
+			   fname, strerror(errno));
+		free(fname);
+		return false;
+	}
 
+#if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
+	if(fstat(fileno(fp), &s)) {
+		logger(LOG_ERR, "Could not stat RSA private key file `%s': %s'",
+				fname, strerror(errno));
 		free(fname);
-		myself->connection->rsa_key =
-			PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
-		fclose(fp);
+		return false;
+	}
 
-		if(!myself->connection->rsa_key) {
-			logger(LOG_ERR, _("Reading RSA private key file `%s' failed: %s"),
-				   fname, strerror(errno));
-			return false;
-		}
+	if(s.st_mode & ~0100700)
+		logger(LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
+#endif
 
-		return true;
+	myself->connection->rsa_key = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
+	fclose(fp);
+
+	if(!myself->connection->rsa_key) {
+		logger(LOG_ERR, "Reading RSA private key file `%s' failed: %s",
+			   fname, strerror(errno));
+		free(fname);
+		return false;
 	}
 
 	free(fname);
-	return false;
+	return true;
+}
+
+/*
+  Read Subnets from all host config files
+*/
+void load_all_subnets(void) {
+	DIR *dir;
+	struct dirent *ent;
+	char *dname;
+	char *fname;
+	avl_tree_t *config_tree;
+	config_t *cfg;
+	subnet_t *s, *s2;
+	node_t *n;
+
+	xasprintf(&dname, "%s/hosts", confbase);
+	dir = opendir(dname);
+	if(!dir) {
+		logger(LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
+		free(dname);
+		return;
+	}
+
+	while((ent = readdir(dir))) {
+		if(!check_id(ent->d_name))
+			continue;
+
+		n = lookup_node(ent->d_name);
+		#ifdef _DIRENT_HAVE_D_TYPE
+		//if(ent->d_type != DT_REG)
+		//	continue;
+		#endif
+
+		xasprintf(&fname, "%s/hosts/%s", confbase, ent->d_name);
+		init_configuration(&config_tree);
+		read_config_options(config_tree, ent->d_name);
+		read_config_file(config_tree, fname);
+		free(fname);
+
+		if(!n) {
+			n = new_node();
+			n->name = xstrdup(ent->d_name);
+			node_add(n);
+		}
+
+		for(cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
+			if(!get_config_subnet(cfg, &s))
+				continue;
+
+			if((s2 = lookup_subnet(n, s))) {
+				s2->expires = -1;
+			} else {
+				subnet_add(n, s);
+			}
+		}
+
+		exit_configuration(&config_tree);
+	}
+
+	closedir(dir);
+}
+
+char *get_name(void) {
+	char *name = NULL;
+
+	get_config_string(lookup_config(config_tree, "Name"), &name);
+
+	if(!name)
+		return NULL;
+
+	if(*name == '$') {
+		char *envname = getenv(name + 1);
+		if(!envname) {
+			if(strcmp(name + 1, "HOST")) {
+				fprintf(stderr, "Invalid Name: environment variable %s does not exist\n", name + 1);
+				return false;
+			}
+			envname = alloca(32);
+			if(gethostname(envname, 32)) {
+				fprintf(stderr, "Could not get hostname: %s\n", strerror(errno));
+				return false;
+			}
+			envname[31] = 0;
+		}
+		free(name);
+		name = xstrdup(envname);
+		for(char *c = name; *c; c++)
+			if(!isalnum(*c))
+				*c = '_';
+	}
+
+	if(!check_id(name)) {
+		logger(LOG_ERR, "Invalid name for myself!");
+		free(name);
+		return false;
+	}
+
+	return name;
 }
 
 /*
   Configure node_t myself and set up the local sockets (listen only)
 */
-bool setup_myself(void)
-{
+static bool setup_myself(void) {
 	config_t *cfg;
 	subnet_t *subnet;
-	char *name, *hostname, *mode, *afname, *cipher, *digest;
+	char *name, *hostname, *mode, *afname, *cipher, *digest, *type;
+	char *fname = NULL;
 	char *address = NULL;
-	struct addrinfo hint, *ai, *aip;
+	char *proxy = NULL;
+	char *space;
+	char *envp[5];
+	struct addrinfo *ai, *aip, hint = {0};
 	bool choice;
-	int err;
-
-	cp();
+	int i, err;
+	int replaywin_int;
 
 	myself = new_node();
 	myself->connection = new_connection();
-	init_configuration(&myself->connection->config_tree);
 
-	asprintf(&myself->hostname, _("MYSELF"));
-	asprintf(&myself->connection->hostname, _("MYSELF"));
+	myself->hostname = xstrdup("MYSELF");
+	myself->connection->hostname = xstrdup("MYSELF");
 
 	myself->connection->options = 0;
 	myself->connection->protocol_version = PROT_CURRENT;
 
-	if(!get_config_string(lookup_config(config_tree, "Name"), &name)) {	/* Not acceptable */
-		logger(LOG_ERR, _("Name for tinc daemon required!"));
-		return false;
-	}
-
-	if(!check_id(name)) {
-		logger(LOG_ERR, _("Invalid name for myself!"));
-		free(name);
+	if(!(name = get_name())) {
+		logger(LOG_ERR, "Name for tinc daemon required!");
 		return false;
 	}
 
 	myself->name = name;
 	myself->connection->name = xstrdup(name);
+	xasprintf(&fname, "%s/hosts/%s", confbase, name);
+	read_config_options(config_tree, name);
+	read_config_file(config_tree, fname);
+	free(fname);
 
 	if(!read_rsa_private_key())
 		return false;
 
-	if(!read_connection_config(myself->connection)) {
-		logger(LOG_ERR, _("Cannot open host configuration file for myself!"));
-		return false;
+	if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
+		myport = xstrdup("655");
+
+	if(!atoi(myport)) {
+		struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
+		sockaddr_t sa;
+		if(!ai || !ai->ai_addr)
+			return false;
+		free(myport);
+		memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
+		sockaddr2str(&sa, NULL, &myport);
 	}
 
-	if(!read_rsa_public_key(myself->connection))
-		return false;
+	get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
+	if(proxy) {
+		if((space = strchr(proxy, ' ')))
+			*space++ = 0;
+
+		if(!strcasecmp(proxy, "none")) {
+			proxytype = PROXY_NONE;
+		} else if(!strcasecmp(proxy, "socks4")) {
+			proxytype = PROXY_SOCKS4;
+		} else if(!strcasecmp(proxy, "socks4a")) {
+			proxytype = PROXY_SOCKS4A;
+		} else if(!strcasecmp(proxy, "socks5")) {
+			proxytype = PROXY_SOCKS5;
+		} else if(!strcasecmp(proxy, "http")) {
+			proxytype = PROXY_HTTP;
+		} else if(!strcasecmp(proxy, "exec")) {
+			proxytype = PROXY_EXEC;
+		} else {
+			logger(LOG_ERR, "Unknown proxy type %s!", proxy);
+			return false;
+		}
 
-	if(!get_config_string
-	   (lookup_config(myself->connection->config_tree, "Port"), &myport))
-		asprintf(&myport, "655");
+		switch(proxytype) {
+			case PROXY_NONE:
+			default:
+				break;
+
+			case PROXY_EXEC:
+				if(!space || !*space) {
+					logger(LOG_ERR, "Argument expected for proxy type exec!");
+					return false;
+				}
+				proxyhost =  xstrdup(space);
+				break;
+
+			case PROXY_SOCKS4:
+			case PROXY_SOCKS4A:
+			case PROXY_SOCKS5:
+			case PROXY_HTTP:
+				proxyhost = space;
+				if(space && (space = strchr(space, ' ')))
+					*space++ = 0, proxyport = space;
+				if(space && (space = strchr(space, ' ')))
+					*space++ = 0, proxyuser = space;
+				if(space && (space = strchr(space, ' ')))
+					*space++ = 0, proxypass = space;
+				if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
+					logger(LOG_ERR, "Host and port argument expected for proxy!");
+					return false;
+				}
+				proxyhost = xstrdup(proxyhost);
+				proxyport = xstrdup(proxyport);
+				if(proxyuser && *proxyuser)
+					proxyuser = xstrdup(proxyuser);
+				if(proxypass && *proxypass)
+					proxypass = xstrdup(proxypass);
+				break;
+		}
+
+		free(proxy);
+	}
 
 	/* Read in all the subnets specified in the host configuration file */
 
-	cfg = lookup_config(myself->connection->config_tree, "Subnet");
+	cfg = lookup_config(config_tree, "Subnet");
 
 	while(cfg) {
 		if(!get_config_subnet(cfg, &subnet))
@@ -256,30 +439,26 @@ bool setup_myself(void)
 
 		subnet_add(myself, subnet);
 
-		cfg = lookup_config_next(myself->connection->config_tree, cfg);
+		cfg = lookup_config_next(config_tree, cfg);
 	}
 
 	/* 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(config_tree, "IndirectData"), &choice) && choice)
+		myself->options |= OPTION_INDIRECT;
 
-	if(get_config_bool(lookup_config(myself->connection->config_tree, "TCPOnly"), &choice))
-		if(choice)
-			myself->options |= OPTION_TCPONLY;
+	if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
+		myself->options |= OPTION_TCPONLY;
 
 	if(myself->options & OPTION_TCPONLY)
 		myself->options |= OPTION_INDIRECT;
 
+	get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
+	get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
+	get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
+	get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
+	strictsubnets |= tunnelserver;
+
 	if(get_config_string(lookup_config(config_tree, "Mode"), &mode)) {
 		if(!strcasecmp(mode, "router"))
 			routing_mode = RMODE_ROUTER;
@@ -288,31 +467,90 @@ bool setup_myself(void)
 		else if(!strcasecmp(mode, "hub"))
 			routing_mode = RMODE_HUB;
 		else {
-			logger(LOG_ERR, _("Invalid routing mode!"));
+			logger(LOG_ERR, "Invalid routing mode!");
 			return false;
 		}
 		free(mode);
-	} else
-		routing_mode = RMODE_ROUTER;
+	}
+
+	if(get_config_string(lookup_config(config_tree, "Forwarding"), &mode)) {
+		if(!strcasecmp(mode, "off"))
+			forwarding_mode = FMODE_OFF;
+		else if(!strcasecmp(mode, "internal"))
+			forwarding_mode = FMODE_INTERNAL;
+		else if(!strcasecmp(mode, "kernel"))
+			forwarding_mode = FMODE_KERNEL;
+		else {
+			logger(LOG_ERR, "Invalid forwarding mode!");
+			return false;
+		}
+		free(mode);
+	}
+
+	choice = true;
+	get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
+	if(choice)
+		myself->options |= OPTION_PMTU_DISCOVERY;
+
+	choice = true;
+	get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
+	if(choice)
+		myself->options |= OPTION_CLAMP_MSS;
 
 	get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
+	get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
+	if(get_config_string(lookup_config(config_tree, "Broadcast"), &mode)) {
+		if(!strcasecmp(mode, "no"))
+			broadcast_mode = BMODE_NONE;
+		else if(!strcasecmp(mode, "yes") || !strcasecmp(mode, "mst"))
+			broadcast_mode = BMODE_MST;
+		else if(!strcasecmp(mode, "direct"))
+			broadcast_mode = BMODE_DIRECT;
+		else {
+			logger(LOG_ERR, "Invalid broadcast mode!");
+			return false;
+		}
+		free(mode);
+	}
 
 #if !defined(SOL_IP) || !defined(IP_TOS)
 	if(priorityinheritance)
-		logger(LOG_WARNING, _("PriorityInheritance not supported on this platform"));
+		logger(LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
 #endif
 
 	if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 		macexpire = 600;
 
-	if(get_config_int(lookup_config(myself->connection->config_tree, "MaxTimeout"), &maxtimeout)) {
+	if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 		if(maxtimeout <= 0) {
-			logger(LOG_ERR, _("Bogus maximum timeout!"));
+			logger(LOG_ERR, "Bogus maximum timeout!");
 			return false;
 		}
 	} else
 		maxtimeout = 900;
 
+	if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
+		if(udp_rcvbuf <= 0) {
+			logger(LOG_ERR, "UDPRcvBuf cannot be negative!");
+			return false;
+		}
+	}
+
+	if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
+		if(udp_sndbuf <= 0) {
+			logger(LOG_ERR, "UDPSndBuf cannot be negative!");
+			return false;
+		}
+	}
+
+	if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
+		if(replaywin_int < 0) {
+			logger(LOG_ERR, "ReplayWindow cannot be negative!");
+			return false;
+		}
+		replaywin = (unsigned)replaywin_int;
+	}
+
 	if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 		if(!strcasecmp(afname, "IPv4"))
 			addressfamily = AF_INET;
@@ -321,7 +559,7 @@ bool setup_myself(void)
 		else if(!strcasecmp(afname, "any"))
 			addressfamily = AF_UNSPEC;
 		else {
-			logger(LOG_ERR, _("Invalid address family!"));
+			logger(LOG_ERR, "Invalid address family!");
 			return false;
 		}
 		free(afname);
@@ -332,85 +570,74 @@ bool setup_myself(void)
 	/* Generate packet encryption key */
 
 	if(get_config_string
-	   (lookup_config(myself->connection->config_tree, "Cipher"), &cipher)) {
+	   (lookup_config(config_tree, "Cipher"), &cipher)) {
 		if(!strcasecmp(cipher, "none")) {
-			myself->cipher = NULL;
+			myself->incipher = NULL;
 		} else {
-			myself->cipher = EVP_get_cipherbyname(cipher);
+			myself->incipher = EVP_get_cipherbyname(cipher);
 
-			if(!myself->cipher) {
-				logger(LOG_ERR, _("Unrecognized cipher type!"));
+			if(!myself->incipher) {
+				logger(LOG_ERR, "Unrecognized cipher type!");
 				return false;
 			}
 		}
 	} else
-		myself->cipher = EVP_bf_cbc();
+		myself->incipher = EVP_bf_cbc();
 
-	if(myself->cipher)
-		myself->keylength = myself->cipher->key_len + myself->cipher->iv_len;
+	if(myself->incipher)
+		myself->inkeylength = myself->incipher->key_len + myself->incipher->iv_len;
 	else
-		myself->keylength = 1;
+		myself->inkeylength = 1;
 
 	myself->connection->outcipher = EVP_bf_ofb();
 
-	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 = now + keylifetime;
 	
-	EVP_CIPHER_CTX_init(&packet_ctx);
-	EVP_DecryptInit_ex(&packet_ctx, myself->cipher, NULL, myself->key, myself->key + myself->cipher->key_len);
-
 	/* Check if we want to use message authentication codes... */
 
-	if(get_config_string
-	   (lookup_config(myself->connection->config_tree, "Digest"), &digest)) {
+	if(get_config_string(lookup_config(config_tree, "Digest"), &digest)) {
 		if(!strcasecmp(digest, "none")) {
-			myself->digest = NULL;
+			myself->indigest = NULL;
 		} else {
-			myself->digest = EVP_get_digestbyname(digest);
+			myself->indigest = EVP_get_digestbyname(digest);
 
-			if(!myself->digest) {
-				logger(LOG_ERR, _("Unrecognized digest type!"));
+			if(!myself->indigest) {
+				logger(LOG_ERR, "Unrecognized digest type!");
 				return false;
 			}
 		}
 	} else
-		myself->digest = EVP_sha1();
+		myself->indigest = EVP_sha1();
 
 	myself->connection->outdigest = 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) {
-				logger(LOG_ERR, _("MAC length exceeds size of digest!"));
+	if(get_config_int(lookup_config(config_tree, "MACLength"), &myself->inmaclength)) {
+		if(myself->indigest) {
+			if(myself->inmaclength > myself->indigest->md_size) {
+				logger(LOG_ERR, "MAC length exceeds size of digest!");
 				return false;
-			} else if(myself->maclength < 0) {
-				logger(LOG_ERR, _("Bogus MAC length!"));
+			} else if(myself->inmaclength < 0) {
+				logger(LOG_ERR, "Bogus MAC length!");
 				return false;
 			}
 		}
 	} else
-		myself->maclength = 4;
+		myself->inmaclength = 4;
 
 	myself->connection->outmaclength = 0;
 
 	/* Compression */
 
-	if(get_config_int
-	   (lookup_config(myself->connection->config_tree, "Compression"),
-		&myself->compression)) {
-		if(myself->compression < 0 || myself->compression > 11) {
-			logger(LOG_ERR, _("Bogus compression level!"));
+	if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
+		if(myself->incompression < 0 || myself->incompression > 11) {
+			logger(LOG_ERR, "Bogus compression level!");
 			return false;
 		}
 	} else
-		myself->compression = 0;
+		myself->incompression = 0;
 
 	myself->connection->outcompression = 0;
 
@@ -418,62 +645,167 @@ bool setup_myself(void)
 
 	myself->nexthop = myself;
 	myself->via = myself;
-	myself->status.active = true;
 	myself->status.reachable = true;
 	node_add(myself);
 
 	graph();
 
-	/* Open sockets */
-
-	memset(&hint, 0, sizeof(hint));
+	if(strictsubnets)
+		load_all_subnets();
 
-	get_config_string(lookup_config(config_tree, "BindToAddress"), &address);
+	/* Open device */
 
-	hint.ai_family = addressfamily;
-	hint.ai_socktype = SOCK_STREAM;
-	hint.ai_protocol = IPPROTO_TCP;
-	hint.ai_flags = AI_PASSIVE;
+	devops = os_devops;
 
-	err = getaddrinfo(address, myport, &hint, &ai);
+	if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
+		if(!strcasecmp(type, "dummy"))
+			devops = dummy_devops;
+		else if(!strcasecmp(type, "raw_socket"))
+			devops = raw_socket_devops;
+		else if(!strcasecmp(type, "multicast"))
+			devops = multicast_devops;
+#ifdef ENABLE_UML
+		else if(!strcasecmp(type, "uml"))
+			devops = uml_devops;
+#endif
+#ifdef ENABLE_VDE
+		else if(!strcasecmp(type, "vde"))
+			devops = vde_devops;
+#endif
+	}
 
-	if(err || !ai) {
-		logger(LOG_ERR, _("System call `%s' failed: %s"), "getaddrinfo",
-			   gai_strerror(err));
+	if(!devops.setup())
 		return false;
-	}
 
-	listen_sockets = 0;
+	/* Run tinc-up script to further initialize the tap interface */
+	xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
+	xasprintf(&envp[1], "DEVICE=%s", device ? : "");
+	xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
+	xasprintf(&envp[3], "NAME=%s", myself->name);
+	envp[4] = NULL;
 
-	for(aip = ai; aip; aip = aip->ai_next) {
-		listen_socket[listen_sockets].tcp =
-			setup_listen_socket((sockaddr_t *) aip->ai_addr);
+	execute_script("tinc-up", envp);
 
-		if(listen_socket[listen_sockets].tcp < 0)
-			continue;
+	for(i = 0; i < 5; i++)
+		free(envp[i]);
 
-		listen_socket[listen_sockets].udp =
-			setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
+	/* Run subnet-up scripts for our own subnets */
 
-		if(listen_socket[listen_sockets].udp < 0)
-			continue;
+	subnet_update(myself, NULL, true);
+
+	/* Open sockets */
+
+	if(!do_detach && getenv("LISTEN_FDS")) {
+		sockaddr_t sa;
+		socklen_t salen;
 
-		ifdebug(CONNECTIONS) {
-			hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
-			logger(LOG_NOTICE, _("Listening on %s"), hostname);
-			free(hostname);
+		listen_sockets = atoi(getenv("LISTEN_FDS"));
+#ifdef HAVE_UNSETENV
+		unsetenv("LISTEN_FDS");
+#endif
+
+		if(listen_sockets > MAXSOCKETS) {
+			logger(LOG_ERR, "Too many listening sockets");
+			return false;
 		}
 
-		listen_socket[listen_sockets].sa.sa = *aip->ai_addr;
-		listen_sockets++;
-	}
+		for(i = 0; i < listen_sockets; i++) {
+			salen = sizeof sa;
+			if(getsockname(i + 3, &sa.sa, &salen) < 0) {
+				logger(LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(errno));
+				return false;
+			}
+
+			listen_socket[i].tcp = i + 3;
+
+#ifdef FD_CLOEXEC
+		        fcntl(i + 3, F_SETFD, FD_CLOEXEC);
+#endif
 
-	freeaddrinfo(ai);
+			listen_socket[i].udp = setup_vpn_in_socket(&sa);
+			if(listen_socket[i].udp < 0)
+				return false;
+
+			ifdebug(CONNECTIONS) {
+				hostname = sockaddr2hostname(&sa);
+				logger(LOG_NOTICE, "Listening on %s", hostname);
+				free(hostname);
+			}
+
+			memcpy(&listen_socket[i].sa, &sa, salen);
+		}
+	} else {
+		listen_sockets = 0;
+		cfg = lookup_config(config_tree, "BindToAddress");
+
+		do {
+			get_config_string(cfg, &address);
+			if(cfg)
+				cfg = lookup_config_next(config_tree, cfg);
+
+			char *port = myport;
+
+			if(address) {
+				char *space = strchr(address, ' ');
+				if(space) {
+					*space++ = 0;
+					port = space;
+				}
+
+				if(!strcmp(address, "*"))
+					*address = 0;
+			}
+
+			hint.ai_family = addressfamily;
+			hint.ai_socktype = SOCK_STREAM;
+			hint.ai_protocol = IPPROTO_TCP;
+			hint.ai_flags = AI_PASSIVE;
+
+			err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
+			free(address);
+
+			if(err || !ai) {
+				logger(LOG_ERR, "System call `%s' failed: %s", "getaddrinfo",
+					   gai_strerror(err));
+				return false;
+			}
+
+			for(aip = ai; aip; aip = aip->ai_next) {
+				if(listen_sockets >= MAXSOCKETS) {
+					logger(LOG_ERR, "Too many listening sockets");
+					return false;
+				}
+
+				listen_socket[listen_sockets].tcp =
+					setup_listen_socket((sockaddr_t *) aip->ai_addr);
+
+				if(listen_socket[listen_sockets].tcp < 0)
+					continue;
+
+				listen_socket[listen_sockets].udp =
+					setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
+
+				if(listen_socket[listen_sockets].udp < 0)
+					continue;
+
+				ifdebug(CONNECTIONS) {
+					hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
+					logger(LOG_NOTICE, "Listening on %s", hostname);
+					free(hostname);
+				}
+
+				memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
+				listen_sockets++;
+			}
+
+			freeaddrinfo(ai);
+		} while(cfg);
+	}
 
 	if(listen_sockets)
-		logger(LOG_NOTICE, _("Ready"));
+		logger(LOG_NOTICE, "Ready");
 	else {
-		logger(LOG_ERR, _("Unable to create any listening socket!"));
+		logger(LOG_ERR, "Unable to create any listening socket!");
 		return false;
 	}
 
@@ -481,102 +813,96 @@ bool setup_myself(void)
 }
 
 /*
-  setup all initial network connections
+  initialize network
 */
-bool setup_network_connections(void)
-{
-	char *envp[5];
-	int i;
-
-	cp();
-
+bool setup_network(void) {
 	now = time(NULL);
 
+	init_events();
 	init_connections();
 	init_subnets();
 	init_nodes();
 	init_edges();
-	init_events();
 	init_requests();
 
-	if(get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout)) {
-		if(pingtimeout < 1) {
-			pingtimeout = 86400;
+	if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
+		if(pinginterval < 1) {
+			pinginterval = 86400;
 		}
 	} else
-		pingtimeout = 60;
+		pinginterval = 60;
 
-	if(!setup_device())
-		return false;
+	if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
+		pingtimeout = 5;
+	if(pingtimeout < 1 || pingtimeout > pinginterval)
+		pingtimeout = pinginterval;
+
+	if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
+		maxoutbufsize = 10 * MTU;
 
 	if(!setup_myself())
 		return false;
 
-	/* Run tinc-up script to further initialize the tap interface */
-	asprintf(&envp[0], "NETNAME=%s", netname ? : "");
-	asprintf(&envp[1], "DEVICE=%s", device ? : "");
-	asprintf(&envp[2], "INTERFACE=%s", iface ? : "");
-	asprintf(&envp[3], "NAME=%s", myself->name);
-	envp[4] = NULL;
-
-	execute_script("tinc-up", envp);
-
-	for(i = 0; i < 5; i++)
-		free(envp[i]);
-
-	try_outgoing_connections();
-
 	return true;
 }
 
 /*
   close all open network connections
 */
-void close_network_connections(void)
-{
+void close_network_connections(void) {
 	avl_node_t *node, *next;
 	connection_t *c;
 	char *envp[5];
 	int i;
 
-	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), c->outgoing = NULL;
+		c = node->data;
+		c->outgoing = NULL;
 		terminate_connection(c, false);
 	}
 
-	if(myself && myself->connection)
+	for(list_node_t *node = outgoing_list->head; node; node = node->next) {
+		outgoing_t *outgoing = node->data;
+
+		if(outgoing->event)
+			event_del(outgoing->event);
+	}
+
+	list_delete_list(outgoing_list);
+
+	if(myself && myself->connection) {
+		subnet_update(myself, NULL, false);
 		terminate_connection(myself->connection, false);
+		free_connection(myself->connection);
+	}
 
 	for(i = 0; i < listen_sockets; i++) {
 		close(listen_socket[i].tcp);
 		close(listen_socket[i].udp);
 	}
 
+	xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
+	xasprintf(&envp[1], "DEVICE=%s", device ? : "");
+	xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
+	xasprintf(&envp[3], "NAME=%s", myself->name);
+	envp[4] = NULL;
+
 	exit_requests();
-	exit_events();
 	exit_edges();
 	exit_subnets();
 	exit_nodes();
 	exit_connections();
-
-	asprintf(&envp[0], "NETNAME=%s", netname ? : "");
-	asprintf(&envp[1], "DEVICE=%s", device ? : "");
-	asprintf(&envp[2], "INTERFACE=%s", iface ? : "");
-	asprintf(&envp[3], "NAME=%s", myself->name);
-	envp[4] = NULL;
+	exit_events();
 
 	execute_script("tinc-down", envp);
 
+	if(myport) free(myport);
+
 	for(i = 0; i < 4; i++)
 		free(envp[i]);
 
-	close_device();
+	devops.close();
 
 	return;
 }