X-Git-Url: http://git.meshlink.io/?a=blobdiff_plain;ds=sidebyside;f=src%2Fnet_setup.c;h=47ed32e0ec9e202b22cb1bf1e73433587b5f5eaf;hb=dd2cf09a9ac438b65a1f4c9dcff8d87a2b504538;hp=198da3df93419e7760d58d98a11c8dca14b17923;hpb=ee427cac0d04c60d09cc235c04664eab8b0c6527;p=meshlink

diff --git a/src/net_setup.c b/src/net_setup.c
index 198da3df..47ed32e0 100644
--- a/src/net_setup.c
+++ b/src/net_setup.c
@@ -1,8 +1,6 @@
 /*
     net_setup.c -- Setup.
-    Copyright (C) 1998-2005 Ivo Timmermans,
-                  2000-2010 Guus Sliepen <guus@tinc-vpn.org>
-                  2006      Scott Lamb <slamb@slamb.org>
+    Copyright (C) 2014-2017 Guus Sliepen <guus@meshlink.io>
 
     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
@@ -21,563 +19,536 @@
 
 #include "system.h"
 
-#include "splay_tree.h"
-#include "cipher.h"
 #include "conf.h"
 #include "connection.h"
-#include "control.h"
-#include "device.h"
-#include "digest.h"
+#include "ecdsa.h"
 #include "graph.h"
 #include "logger.h"
+#include "meshlink_internal.h"
 #include "net.h"
 #include "netutl.h"
-#include "process.h"
 #include "protocol.h"
 #include "route.h"
-#include "rsa.h"
-#include "subnet.h"
 #include "utils.h"
 #include "xalloc.h"
+#include "submesh.h"
 
-char *myport;
-static struct event device_ev;
+bool node_read_ecdsa_public_key(meshlink_handle_t *mesh, node_t *n) {
+	if(ecdsa_active(n->ecdsa)) {
+		return true;
+	}
 
-bool read_rsa_public_key(connection_t *c) {
-	FILE *fp;
-	char *fname;
-	char *n;
-	bool result;
+	splay_tree_t *config_tree;
+	char *p;
 
-	/* First, check for simple PublicKey statement */
+	init_configuration(&config_tree);
 
-	if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
-		result = rsa_set_hex_public_key(&c->rsa, n, "FFFF");
-		free(n);
-		return result;
+	if(!read_host_config(mesh, config_tree, n->name)) {
+		goto exit;
 	}
 
-	/* Else, check for PublicKeyFile statement and read it */
+	/* First, check for simple ECDSAPublicKey statement */
 
-	if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
-		xasprintf(&fname, "%s/hosts/%s", confbase, c->name);
-
-	fp = fopen(fname, "r");
-
-	if(!fp) {
-		logger(LOG_ERR, "Error reading RSA public key file `%s': %s",
-			   fname, strerror(errno));
-		free(fname);
-		return false;
+	if(get_config_string(lookup_config(config_tree, "ECDSAPublicKey"), &p)) {
+		n->ecdsa = ecdsa_set_base64_public_key(p);
+		free(p);
 	}
 
-	result = rsa_read_pem_public_key(&c->rsa, fp);
-	fclose(fp);
-
-	if(!result) 
-		logger(LOG_ERR, "Reading RSA public key file `%s' failed: %s", fname, strerror(errno));
-	free(fname);
-	return result;
+exit:
+	exit_configuration(&config_tree);
+	return n->ecdsa;
 }
 
-bool read_rsa_private_key() {
-	FILE *fp;
-	char *fname;
-	char *n, *d;
-	bool result;
+bool read_ecdsa_public_key(meshlink_handle_t *mesh, connection_t *c) {
+	if(ecdsa_active(c->ecdsa)) {
+		return true;
+	}
+
+	char *p;
 
-	/* First, check for simple PrivateKey statement */
+	if(!c->config_tree) {
+		init_configuration(&c->config_tree);
 
-	if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
-		if(!get_config_string(lookup_config(myself->connection->config_tree, "PublicKey"), &n)) {
-			logger(LOG_ERR, "PrivateKey used but no PublicKey found!");
-			free(d);
+		if(!read_host_config(mesh, c->config_tree, c->name)) {
 			return false;
 		}
-		result = rsa_set_hex_private_key(&myself->connection->rsa, n, "FFFF", d);
-		free(n);
-		free(d);
-		return true;
 	}
 
-	/* Else, check for PrivateKeyFile statement and read it */
+	/* First, check for simple ECDSAPublicKey statement */
+
+	if(get_config_string(lookup_config(c->config_tree, "ECDSAPublicKey"), &p)) {
+		c->ecdsa = ecdsa_set_base64_public_key(p);
+		free(p);
+		return c->ecdsa;
+	}
+
+	return false;
+}
 
-	if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
-		xasprintf(&fname, "%s/rsa_key.priv", confbase);
+bool read_ecdsa_private_key(meshlink_handle_t *mesh) {
+	FILE *fp;
+	char filename[PATH_MAX];
 
-	fp = fopen(fname, "r");
+	snprintf(filename, PATH_MAX, "%s" SLASH "ecdsa_key.priv", mesh->confbase);
+	fp = fopen(filename, "rb");
 
 	if(!fp) {
-		logger(LOG_ERR, "Error reading RSA private key file `%s': %s",
-			   fname, strerror(errno));
-		free(fname);
+		logger(mesh, MESHLINK_ERROR, "Error reading ECDSA private key file: %s", strerror(errno));
 		return false;
 	}
 
-#if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
-	struct stat s;
+	mesh->self->connection->ecdsa = ecdsa_read_pem_private_key(fp);
+	fclose(fp);
 
-	if(fstat(fileno(fp), &s)) {
-		logger(LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
-		free(fname);
-		return false;
+	if(!mesh->self->connection->ecdsa) {
+		logger(mesh, MESHLINK_ERROR, "Reading ECDSA private key file failed: %s", strerror(errno));
 	}
 
-	if(s.st_mode & ~0100700)
-		logger(LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
-#endif
+	return mesh->self->connection->ecdsa;
+}
 
-	result = rsa_read_pem_private_key(&myself->connection->rsa, fp);
-	fclose(fp);
+static bool read_invitation_key(meshlink_handle_t *mesh) {
+	FILE *fp;
+	char filename[PATH_MAX];
 
-	if(!result) 
-		logger(LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
-	free(fname);
-	return result;
-}
+	if(mesh->invitation_key) {
+		ecdsa_free(mesh->invitation_key);
+		mesh->invitation_key = NULL;
+	}
 
-static struct event keyexpire_event;
+	snprintf(filename, PATH_MAX, "%s" SLASH "invitations" SLASH "ecdsa_key.priv", mesh->confbase);
 
-static void keyexpire_handler(int fd, short events, void *data) {
-	regenerate_key();
-}
+	fp = fopen(filename, "rb");
+
+	if(fp) {
+		mesh->invitation_key = ecdsa_read_pem_private_key(fp);
+		fclose(fp);
 
-void regenerate_key() {
-	if(timeout_initialized(&keyexpire_event)) {
-		ifdebug(STATUS) logger(LOG_INFO, "Expiring symmetric keys");
-		event_del(&keyexpire_event);
-		send_key_changed(broadcast, myself);
-	} else {
-		timeout_set(&keyexpire_event, keyexpire_handler, NULL);
+		if(!mesh->invitation_key) {
+			logger(mesh, MESHLINK_ERROR, "Reading ECDSA private key file `%s' failed: %s", filename, strerror(errno));
+		}
 	}
 
-	event_add(&keyexpire_event, &(struct timeval){keylifetime, 0});
+	return mesh->invitation_key;
 }
 
-/*
-  Read Subnets from all host config files
-*/
-void load_all_subnets(void) {
-	DIR *dir;
-	struct dirent *ent;
-	char *dname;
-	char *fname;
+bool node_read_devclass(meshlink_handle_t *mesh, node_t *n) {
+
 	splay_tree_t *config_tree;
-	config_t *cfg;
-	subnet_t *s, *s2;
-	node_t *n;
-	bool result;
+	char *p;
 
-	xasprintf(&dname, "%s/hosts", confbase);
-	dir = opendir(dname);
-	if(!dir) {
-		logger(LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
-		free(dname);
-		return;
+	init_configuration(&config_tree);
+
+	if(!read_host_config(mesh, config_tree, n->name)) {
+		goto exit;
 	}
 
-	while((ent = readdir(dir))) {
-		if(!check_id(ent->d_name))
-			continue;
+	if(get_config_string(lookup_config(config_tree, "DeviceClass"), &p)) {
+		n->devclass = atoi(p);
+		free(p);
+	}
 
-		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);
-		result = read_config_file(config_tree, fname);
-		free(fname);
-		if(!result)
-			continue;
+	if((int)n->devclass < 0 || n->devclass > _DEV_CLASS_MAX) {
+		n->devclass = _DEV_CLASS_MAX;
+	}
 
-		if(!n) {
-			n = new_node();
-			n->name = xstrdup(ent->d_name);
-			node_add(n);
-		}
+exit:
+	exit_configuration(&config_tree);
+	return n->devclass != 0;
+}
 
-		for(cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
-			if(!get_config_subnet(cfg, &s))
-				continue;
+bool node_read_submesh(meshlink_handle_t *mesh, node_t *n) {
 
-			if((s2 = lookup_subnet(n, s))) {
-				s2->expires = -1;
-			} else {
-				subnet_add(n, s);
+	splay_tree_t *config_tree;
+	char *p;
+
+	init_configuration(&config_tree);
+
+	if(!read_host_config(mesh, config_tree, n->name)) {
+		goto exit;
+	}
+
+	if(get_config_string(lookup_config(config_tree, "SubMesh"), &p)) {
+		n->submesh = NULL;
+
+		for list_each(submesh_t, s, mesh->submeshes) {
+			if(!strcmp(p, s->name)) {
+				n->submesh = s;
+				break;
 			}
 		}
 
-		exit_configuration(&config_tree);
+		if(!n->submesh) {
+			n->submesh = (submesh_t *)meshlink_submesh_open(mesh, p);
+		}
+
+		free(p);
 	}
 
-	closedir(dir);
+exit:
+	exit_configuration(&config_tree);
+	return n->submesh != NULL;
 }
 
-/*
-  Configure node_t myself and set up the local sockets (listen only)
-*/
-bool setup_myself(void) {
-	config_t *cfg;
-	subnet_t *subnet;
-	char *name, *hostname, *mode, *afname, *cipher, *digest;
-	char *address = NULL;
-	char *envp[5];
-	struct addrinfo *ai, *aip, hint = {0};
-	bool choice;
-	int i, err;
+bool node_write_devclass(meshlink_handle_t *mesh, node_t *n) {
+
+	if((int)n->devclass < 0 || n->devclass > _DEV_CLASS_MAX) {
+		return false;
+	}
 
-	myself = new_node();
-	myself->connection = new_connection();
-	init_configuration(&myself->connection->config_tree);
+	bool result = false;
 
-	myself->hostname = xstrdup("MYSELF");
-	myself->connection->hostname = xstrdup("MYSELF");
+	splay_tree_t *config_tree;
+	init_configuration(&config_tree);
 
-	myself->connection->options = 0;
-	myself->connection->protocol_version = PROT_CURRENT;
+	// ignore read errors; in case the file does not exist we will create it
+	read_host_config(mesh, config_tree, n->name);
 
-	if(!get_config_string(lookup_config(config_tree, "Name"), &name)) {	/* Not acceptable */
-		logger(LOG_ERR, "Name for tinc daemon required!");
-		return false;
-	}
+	config_t *cnf = lookup_config(config_tree, "DeviceClass");
 
-	if(!check_id(name)) {
-		logger(LOG_ERR, "Invalid name for myself!");
-		free(name);
-		return false;
+	if(!cnf) {
+		cnf = new_config();
+		cnf->variable = xstrdup("DeviceClass");
+		config_add(config_tree, cnf);
 	}
 
-	myself->name = name;
-	myself->connection->name = xstrdup(name);
+	set_config_int(cnf, n->devclass);
 
-	if(!read_connection_config(myself->connection)) {
-		logger(LOG_ERR, "Cannot open host configuration file for myself!");
-		return false;
+	if(!write_host_config(mesh, config_tree, n->name)) {
+		goto fail;
 	}
 
-	if(!read_rsa_private_key())
-		return false;
+	result = true;
+
+fail:
+	exit_configuration(&config_tree);
+	return result;
+}
 
-	if(!get_config_string(lookup_config(config_tree, "Port"), &myport)
-			&& !get_config_string(lookup_config(myself->connection->config_tree, "Port"), &myport))
-		myport = xstrdup("655");
+bool node_write_submesh(meshlink_handle_t *mesh, node_t *n) {
 
-	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(!n->submesh) {
+		return false;
 	}
 
-	/* Read in all the subnets specified in the host configuration file */
+	bool result = false;
 
-	cfg = lookup_config(myself->connection->config_tree, "Subnet");
+	splay_tree_t *config_tree;
+	init_configuration(&config_tree);
 
-	while(cfg) {
-		if(!get_config_subnet(cfg, &subnet))
-			return false;
+	// ignore read errors; in case the file does not exist we will create it
+	read_host_config(mesh, config_tree, n->name);
 
-		subnet_add(myself, subnet);
+	config_t *cnf = lookup_config(config_tree, "SubMesh");
 
-		cfg = lookup_config_next(myself->connection->config_tree, cfg);
+	if(!cnf) {
+		cnf = new_config();
+		cnf->variable = xstrdup("SubMesh");
+		config_add(config_tree, cnf);
 	}
 
-	/* Check some options */
+	set_config_string(cnf, n->submesh->name);
 
-	if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
-		myself->options |= OPTION_INDIRECT;
+	if(!write_host_config(mesh, config_tree, n->name)) {
+		goto fail;
+	}
 
-	if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
-		myself->options |= OPTION_TCPONLY;
+	result = true;
 
-	if(get_config_bool(lookup_config(myself->connection->config_tree, "IndirectData"), &choice) && choice)
-		myself->options |= OPTION_INDIRECT;
+fail:
+	exit_configuration(&config_tree);
+	return result;
+}
 
-	if(get_config_bool(lookup_config(myself->connection->config_tree, "TCPOnly"), &choice) && choice)
-		myself->options |= OPTION_TCPONLY;
+void load_all_nodes(meshlink_handle_t *mesh) {
+	DIR *dir;
+	struct dirent *ent;
+	char dname[PATH_MAX];
 
-	if(myself->options & OPTION_TCPONLY)
-		myself->options |= OPTION_INDIRECT;
+	snprintf(dname, PATH_MAX, "%s" SLASH "hosts", mesh->confbase);
+	dir = opendir(dname);
 
-	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);
-	strictsubnets |= tunnelserver;
+	if(!dir) {
+		logger(mesh, MESHLINK_ERROR, "Could not open %s: %s", dname, strerror(errno));
+		return;
+	}
 
-	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 {
-			logger(LOG_ERR, "Invalid routing mode!");
-			return false;
+	while((ent = readdir(dir))) {
+		if(!check_id(ent->d_name)) {
+			continue;
 		}
-		free(mode);
-	}
-
-	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;
+
+		node_t *n = lookup_node(mesh, ent->d_name);
+
+		if(n) {
+			if(n == mesh->self && !n->submesh) {
+				node_read_submesh(mesh, n);
+			}
+
+			continue;
 		}
-		free(mode);
+
+		n = new_node();
+		n->name = xstrdup(ent->d_name);
+		node_read_devclass(mesh, n);
+		node_read_submesh(mesh, n);
+		node_add(mesh, n);
 	}
 
-	choice = true;
-	get_config_bool(lookup_config(myself->connection->config_tree, "PMTUDiscovery"), &choice);
-	get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
-	if(choice)
-		myself->options |= OPTION_PMTU_DISCOVERY;
+	closedir(dir);
+}
 
-	choice = true;
-	get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
-	get_config_bool(lookup_config(myself->connection->config_tree, "ClampMSS"), &choice);
-	if(choice)
-		myself->options |= OPTION_CLAMP_MSS;
 
-	get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
+char *get_name(meshlink_handle_t *mesh) {
+	char *name = NULL;
 
-#if !defined(SOL_IP) || !defined(IP_TOS)
-	if(priorityinheritance)
-		logger(LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
-#endif
+	get_config_string(lookup_config(mesh->config, "Name"), &name);
 
-	if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
-		macexpire = 600;
+	if(!name) {
+		return NULL;
+	}
 
-	if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
-		if(maxtimeout <= 0) {
-			logger(LOG_ERR, "Bogus maximum timeout!");
-			return false;
-		}
-	} else
-		maxtimeout = 900;
-
-	if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
-		if(!strcasecmp(afname, "IPv4"))
-			addressfamily = AF_INET;
-		else if(!strcasecmp(afname, "IPv6"))
-			addressfamily = AF_INET6;
-		else if(!strcasecmp(afname, "any"))
-			addressfamily = AF_UNSPEC;
-		else {
-			logger(LOG_ERR, "Invalid address family!");
-			return false;
-		}
-		free(afname);
+	if(!check_id(name)) {
+		logger(mesh, MESHLINK_ERROR, "Invalid name for mesh->self!");
+		free(name);
+		return NULL;
 	}
 
-	get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
+	return name;
+}
 
-	/* Generate packet encryption key */
+bool setup_myself_reloadable(meshlink_handle_t *mesh) {
+	mesh->localdiscovery = true;
+	keylifetime = 3600; // TODO: check if this can be removed as well
+	mesh->maxtimeout = 900;
+	mesh->self->options |= OPTION_PMTU_DISCOVERY;
 
-	if(!get_config_string(lookup_config(myself->connection->config_tree, "Cipher"), &cipher))
-		cipher = xstrdup("blowfish");
+	read_invitation_key(mesh);
 
-	if(!cipher_open_by_name(&myself->incipher, cipher)) {
-		logger(LOG_ERR, "Unrecognized cipher type!");
-		return false;
-	}
+	return true;
+}
 
-	if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
-		keylifetime = 3600;
+/*
+  Add listening sockets.
+*/
+static bool add_listen_address(meshlink_handle_t *mesh, char *address, bool bindto) {
+	char *port = mesh->myport;
 
-	regenerate_key();
+	if(address) {
+		char *space = strchr(address, ' ');
 
-	/* Check if we want to use message authentication codes... */
+		if(space) {
+			*space++ = 0;
+			port = space;
+		}
 
-	if(!get_config_string(lookup_config(myself->connection->config_tree, "Digest"), &digest))
-		digest = xstrdup("sha1");
+		if(!strcmp(address, "*")) {
+			*address = 0;
+		}
+	}
 
-	int maclength = 4;
-	get_config_int(lookup_config(myself->connection->config_tree, "MACLength"), &maclength);
+	struct addrinfo *ai;
 
-	if(maclength < 0) {
-		logger(LOG_ERR, "Bogus MAC length!");
-		return false;
-	}
+	struct addrinfo hint = {
+		.ai_family = addressfamily,
+		.ai_socktype = SOCK_STREAM,
+		.ai_protocol = IPPROTO_TCP,
+		.ai_flags = AI_PASSIVE,
+	};
 
-	if(!digest_open_by_name(&myself->indigest, digest, maclength)) {
-		logger(LOG_ERR, "Unrecognized digest type!");
+	int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
+
+	free(address);
+
+	if(err || !ai) {
+		logger(mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
 		return false;
 	}
 
-	/* Compression */
+	bool success = false;
+
+	for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
+		// Ignore duplicate addresses
+		bool found = false;
+
+		for(int i = 0; i < mesh->listen_sockets; i++)
+			if(!memcmp(&mesh->listen_socket[i].sa, aip->ai_addr, aip->ai_addrlen)) {
+				found = true;
+				break;
+			}
+
+		if(found) {
+			continue;
+		}
 
-	if(get_config_int(lookup_config(myself->connection->config_tree, "Compression"), &myself->incompression)) {
-		if(myself->incompression < 0 || myself->incompression > 11) {
-			logger(LOG_ERR, "Bogus compression level!");
+		if(mesh->listen_sockets >= MAXSOCKETS) {
+			logger(mesh, MESHLINK_ERROR, "Too many listening sockets");
 			return false;
 		}
-	} else
-		myself->incompression = 0;
 
-	myself->connection->outcompression = 0;
+		int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
 
-	/* Done */
+		if(tcp_fd < 0) {
+			continue;
+		}
+
+		int udp_fd = setup_vpn_in_socket(mesh, (sockaddr_t *) aip->ai_addr);
+
+		if(udp_fd < 0) {
+			close(tcp_fd);
+			continue;
+		}
+
+		io_add(&mesh->loop, &mesh->listen_socket[mesh->listen_sockets].tcp, handle_new_meta_connection, &mesh->listen_socket[mesh->listen_sockets], tcp_fd, IO_READ);
+		io_add(&mesh->loop, &mesh->listen_socket[mesh->listen_sockets].udp, handle_incoming_vpn_data, &mesh->listen_socket[mesh->listen_sockets], udp_fd, IO_READ);
 
-	myself->nexthop = myself;
-	myself->via = myself;
-	myself->status.reachable = true;
-	node_add(myself);
+		if(mesh->log_level >= MESHLINK_INFO) {
+			char *hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
+			logger(mesh, MESHLINK_INFO, "Listening on %s", hostname);
+			free(hostname);
+		}
 
-	graph();
+		mesh->listen_socket[mesh->listen_sockets].bindto = bindto;
+		memcpy(&mesh->listen_socket[mesh->listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
+		mesh->listen_sockets++;
+		success = true;
+	}
 
-	if(strictsubnets)
-		load_all_subnets();
+	freeaddrinfo(ai);
+	return success;
+}
 
-	/* Open device */
+/*
+  Configure node_t mesh->self and set up the local sockets (listen only)
+*/
+bool setup_myself(meshlink_handle_t *mesh) {
+	char *name;
+	char *address = NULL;
 
-	if(!setup_device())
+	if(!(name = get_name(mesh))) {
+		logger(mesh, MESHLINK_ERROR, "Name for MeshLink instance required!");
 		return false;
+	}
 
-	if(device_fd >= 0) {
-		event_set(&device_ev, device_fd, EV_READ|EV_PERSIST, handle_device_data, NULL);
+	mesh->self = new_node();
+	mesh->self->connection = new_connection();
+	mesh->self->name = name;
+	mesh->self->devclass = mesh->devclass;
+	mesh->self->connection->name = xstrdup(name);
+	read_host_config(mesh, mesh->config, name);
 
-		if (event_add(&device_ev, NULL) < 0) {
-			logger(LOG_ERR, "event_add failed: %s", strerror(errno));
-			close_device();
+	if(!get_config_string(lookup_config(mesh->config, "Port"), &mesh->myport)) {
+		int port = check_port(mesh);
+
+		if(port == 0) {
 			return false;
 		}
-	}
 
-	/* 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;
+		xasprintf(&mesh->myport, "%d", port);
+	}
 
-	execute_script("tinc-up", envp);
+	mesh->self->connection->options = 0;
+	mesh->self->connection->protocol_major = PROT_MAJOR;
+	mesh->self->connection->protocol_minor = PROT_MINOR;
 
-	for(i = 0; i < 4; i++)
-		free(envp[i]);
+	mesh->self->options |= PROT_MINOR << 24;
 
-	/* Run subnet-up scripts for our own subnets */
+	if(!read_ecdsa_private_key(mesh)) {
+		return false;
+	}
 
-	subnet_update(myself, NULL, true);
+	/* Ensure mesh->myport is numeric */
 
-	/* Open sockets */
+	if(!atoi(mesh->myport)) {
+		struct addrinfo *ai = str2addrinfo("localhost", mesh->myport, SOCK_DGRAM);
+		sockaddr_t sa;
 
-	get_config_string(lookup_config(config_tree, "BindToAddress"), &address);
+		if(!ai || !ai->ai_addr) {
+			return false;
+		}
 
-	hint.ai_family = addressfamily;
-	hint.ai_socktype = SOCK_STREAM;
-	hint.ai_protocol = IPPROTO_TCP;
-	hint.ai_flags = AI_PASSIVE;
+		free(mesh->myport);
+		memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
+		sockaddr2str(&sa, NULL, &mesh->myport);
+	}
 
-	err = getaddrinfo(address, myport, &hint, &ai);
+	/* Check some options */
 
-	if(err || !ai) {
-		logger(LOG_ERR, "System call `%s' failed: %s", "getaddrinfo",
-			   gai_strerror(err));
+	if(!setup_myself_reloadable(mesh)) {
 		return false;
 	}
 
-	listen_sockets = 0;
+	/* Compression */
 
-	for(aip = ai; aip; aip = aip->ai_next) {
-		listen_socket[listen_sockets].tcp =
-			setup_listen_socket((sockaddr_t *) aip->ai_addr);
+	// TODO: drop compression in the packet layer?
+	mesh->self->incompression = 0;
+	mesh->self->connection->outcompression = 0;
 
-		if(listen_socket[listen_sockets].tcp < 0)
-			continue;
+	/* Done */
 
-		listen_socket[listen_sockets].udp =
-			setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
+	mesh->self->nexthop = mesh->self;
+	mesh->self->via = mesh->self;
+	mesh->self->status.reachable = true;
+	mesh->self->last_state_change = mesh->loop.now.tv_sec;
 
-		if(listen_socket[listen_sockets].udp < 0) {
-			close(listen_socket[listen_sockets].tcp);
-			continue;
-		}
+	node_write_devclass(mesh, mesh->self);
+	node_add(mesh, mesh->self);
 
-		event_set(&listen_socket[listen_sockets].ev_tcp,
-				  listen_socket[listen_sockets].tcp,
-				  EV_READ|EV_PERSIST,
-				  handle_new_meta_connection, NULL);
-		if(event_add(&listen_socket[listen_sockets].ev_tcp, NULL) < 0) {
-			logger(LOG_ERR, "event_add failed: %s", strerror(errno));
-			abort();
-		}
+	graph(mesh);
 
-		event_set(&listen_socket[listen_sockets].ev_udp,
-				  listen_socket[listen_sockets].udp,
-				  EV_READ|EV_PERSIST,
-				  handle_incoming_vpn_data, NULL);
-		if(event_add(&listen_socket[listen_sockets].ev_udp, NULL) < 0) {
-			logger(LOG_ERR, "event_add failed: %s", strerror(errno));
-			abort();
-		}
+	load_all_nodes(mesh);
 
-		ifdebug(CONNECTIONS) {
-			hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
-			logger(LOG_NOTICE, "Listening on %s", hostname);
-			free(hostname);
-		}
+	/* Open sockets */
+
+	mesh->listen_sockets = 0;
 
-		memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
-		listen_sockets++;
+	if(!add_listen_address(mesh, address, NULL)) {
+		if(strcmp(mesh->myport, "0")) {
+			logger(mesh, MESHLINK_INFO, "Could not bind to port %s, asking OS to choose one for us", mesh->myport);
+			free(mesh->myport);
+			mesh->myport = strdup("0");
 
-		if(listen_sockets >= MAXSOCKETS) {
-			logger(LOG_WARNING, "Maximum of %d listening sockets reached", MAXSOCKETS);
-			break;
+			if(!mesh->myport) {
+				return false;
+			}
+
+			if(!add_listen_address(mesh, address, NULL)) {
+				return false;
+			}
+		} else {
+			return false;
 		}
 	}
 
-	freeaddrinfo(ai);
-
-	if(listen_sockets)
-		logger(LOG_NOTICE, "Ready");
-	else {
-		logger(LOG_ERR, "Unable to create any listening socket!");
+	if(!mesh->listen_sockets) {
+		logger(mesh, MESHLINK_ERROR, "Unable to create any listening socket!");
 		return false;
 	}
 
+	/* Done. */
+
+	mesh->last_config_check = mesh->loop.now.tv_sec;
+
 	return true;
 }
 
 /*
   initialize network
 */
-bool setup_network(void) {
-	init_connections();
-	init_subnets();
-	init_nodes();
-	init_edges();
-	init_requests();
-
-	if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
-		if(pinginterval < 1) {
-			pinginterval = 86400;
-		}
-	} else
-		pinginterval = 60;
-
-	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())
+bool setup_network(meshlink_handle_t *mesh) {
+	init_connections(mesh);
+	init_submeshes(mesh);
+	init_nodes(mesh);
+	init_edges(mesh);
+	init_requests(mesh);
+
+	mesh->pinginterval = 60;
+	mesh->pingtimeout = 5;
+	maxoutbufsize = 10 * MTU;
+
+	if(!setup_myself(mesh)) {
 		return false;
+	}
 
 	return true;
 }
@@ -585,54 +556,40 @@ bool setup_network(void) {
 /*
   close all open network connections
 */
-void close_network_connections(void) {
-	splay_node_t *node, *next;
-	connection_t *c;
-	char *envp[5];
-	int i;
-
-	for(node = connection_tree->head; node; node = next) {
-		next = node->next;
-		c = node->data;
-		c->outgoing = false;
-		terminate_connection(c, false);
+void close_network_connections(meshlink_handle_t *mesh) {
+	if(mesh->connections) {
+		for(list_node_t *node = mesh->connections->head, *next; node; node = next) {
+			next = node->next;
+			connection_t *c = node->data;
+			c->outgoing = NULL;
+			terminate_connection(mesh, c, false);
+		}
 	}
 
-	list_delete_list(outgoing_list);
-
-	if(myself && myself->connection) {
-		subnet_update(myself, NULL, false);
-		terminate_connection(myself->connection, false);
-		free_connection(myself->connection);
+	if(mesh->outgoings) {
+		list_delete_list(mesh->outgoings);
 	}
 
-	for(i = 0; i < listen_sockets; i++) {
-		event_del(&listen_socket[i].ev_tcp);
-		event_del(&listen_socket[i].ev_udp);
-		close(listen_socket[i].tcp);
-		close(listen_socket[i].udp);
+	if(mesh->self && mesh->self->connection) {
+		terminate_connection(mesh, mesh->self->connection, false);
+		free_connection(mesh->self->connection);
 	}
 
-	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_edges();
-	exit_subnets();
-	exit_nodes();
-	exit_connections();
-
-	execute_script("tinc-down", envp);
-
-	if(myport) free(myport);
+	for(int i = 0; i < mesh->listen_sockets; i++) {
+		io_del(&mesh->loop, &mesh->listen_socket[i].tcp);
+		io_del(&mesh->loop, &mesh->listen_socket[i].udp);
+		close(mesh->listen_socket[i].tcp.fd);
+		close(mesh->listen_socket[i].udp.fd);
+	}
 
-	for(i = 0; i < 4; i++)
-		free(envp[i]);
+	exit_requests(mesh);
+	exit_edges(mesh);
+	exit_nodes(mesh);
+	exit_connections(mesh);
 
-	close_device();
+	if(mesh->myport) {
+		free(mesh->myport);
+	}
 
 	return;
 }