X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Ftincctl.c;h=91f63effb08f16789595ea364603f70bb0597d99;hp=39bd326d5850966ff5280dc2555db33eafa20acf;hb=76a9be5bce43a1a7363c670882f5315c824c903c;hpb=6396f42d74f22ab5f8e736dc5cb04c57917f9319

diff --git a/src/tincctl.c b/src/tincctl.c
index 39bd326d..91f63eff 100644
--- a/src/tincctl.c
+++ b/src/tincctl.c
@@ -1,6 +1,6 @@
 /*
     tincctl.c -- Controlling a running tincd
-    Copyright (C) 2007-2012 Guus Sliepen <guus@tinc-vpn.org>
+    Copyright (C) 2007-2014 Guus Sliepen <guus@tinc-vpn.org>
 
     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
@@ -21,22 +21,32 @@
 
 #include <getopt.h>
 
+#ifdef HAVE_READLINE
+#include "readline/readline.h"
+#include "readline/history.h"
+#endif
+
 #include "xalloc.h"
 #include "protocol.h"
 #include "control_common.h"
+#include "crypto.h"
 #include "ecdsagen.h"
+#include "fsck.h"
 #include "info.h"
+#include "invitation.h"
+#include "names.h"
 #include "rsagen.h"
 #include "utils.h"
 #include "tincctl.h"
 #include "top.h"
+#include "version.h"
 
-#ifdef HAVE_MINGW
-#define mkdir(a, b) mkdir(a)
+#ifndef MSG_NOSIGNAL
+#define MSG_NOSIGNAL 0
 #endif
 
-/* The name this program was run with. */
-static char *program_name = NULL;
+static char **orig_argv;
+static int orig_argc;
 
 /* If nonzero, display usage information and exit. */
 static bool show_help = false;
@@ -45,50 +55,41 @@ static bool show_help = false;
 static bool show_version = false;
 
 static char *name = NULL;
-static char *identname = NULL;				/* program name for syslog */
-static char *pidfilename = NULL;			/* pid file location */
-static char *confdir = NULL;
-static char controlcookie[1024];
-char *netname = NULL;
-char *confbase = NULL;
-static char *tinc_conf = NULL;
-static char *hosts_dir = NULL;
+static char controlcookie[1025];
+char *tinc_conf = NULL;
+char *hosts_dir = NULL;
+struct timeval now;
 
 // Horrible global variables...
 static int pid = 0;
-static int fd = -1;
-static char line[4096];
+int fd = -1;
+char line[4096];
 static int code;
 static int req;
 static int result;
-static bool force = false;
-
-#ifdef HAVE_MINGW
-static struct WSAData wsa_state;
-#endif
+bool force = false;
+bool tty = true;
+bool confbasegiven = false;
+bool netnamegiven = false;
+char *scriptinterpreter = NULL;
+char *scriptextension = "";
+static char *prompt;
 
 static struct option const long_options[] = {
+	{"batch", no_argument, NULL, 'b'},
 	{"config", required_argument, NULL, 'c'},
-	{"debug", optional_argument, NULL, 0},
-	{"no-detach", no_argument, NULL, 0},
-	{"mlock", no_argument, NULL, 0},
 	{"net", required_argument, NULL, 'n'},
 	{"help", no_argument, NULL, 1},
 	{"version", no_argument, NULL, 2},
-	{"pidfile", required_argument, NULL, 5},
-	{"logfile", required_argument, NULL, 0},
-	{"bypass-security", no_argument, NULL, 0},
-	{"chroot", no_argument, NULL, 0},
-	{"user", required_argument, NULL, 0},
-	{"option", required_argument, NULL, 0},
-	{"force", no_argument, NULL, 6},
+	{"pidfile", required_argument, NULL, 3},
+	{"force", no_argument, NULL, 4},
 	{NULL, 0, NULL, 0}
 };
 
 static void version(void) {
 	printf("%s version %s (built %s %s, protocol %d.%d)\n", PACKAGE,
-		   VERSION, __DATE__, __TIME__, PROT_MAJOR, PROT_MINOR);
-	printf("Copyright (C) 1998-2012 Ivo Timmermans, Guus Sliepen and others.\n"
+		   VERSION, BUILD_DATE, BUILD_TIME, PROT_MAJOR, PROT_MINOR);
+	printf("Copyright (C) 1998-2014 Ivo Timmermans, Guus Sliepen and others.\n"
 			"See the AUTHORS file for a complete list.\n\n"
 			"tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 			"and you are welcome to redistribute it under certain conditions;\n"
@@ -96,39 +97,43 @@ static void version(void) {
 }
 
 static void usage(bool status) {
-	if(status)
-		fprintf(stderr, "Try `%s --help\' for more information.\n",
-				program_name);
-	else {
+	if(status) {
+		fprintf(stderr, "Try `%s --help\' for more information.\n", program_name);
+	} else {
 		printf("Usage: %s [options] command\n\n", program_name);
 		printf("Valid options are:\n"
+				"  -b, --batch             Don't ask for anything (non-interactive mode).\n"
 				"  -c, --config=DIR        Read configuration options from DIR.\n"
 				"  -n, --net=NETNAME       Connect to net NETNAME.\n"
 				"      --pidfile=FILENAME  Read control cookie from FILENAME.\n"
+				"      --force             Force some commands to work despite warnings.\n"
 				"      --help              Display this help and exit.\n"
 				"      --version           Output version information and exit.\n"
 				"\n"
 				"Valid commands are:\n"
 				"  init [name]                Create initial configuration files.\n"
-				"  config                     Change configuration:\n"
-				"    [get] VARIABLE           - print current value of VARIABLE\n"
-				"    [set] VARIABLE VALUE     - set VARIABLE to VALUE\n"
-				"    add VARIABLE VALUE       - add VARIABLE with the given VALUE\n"
-				"    del VARIABLE [VALUE]     - remove VARIABLE [only ones with watching VALUE]\n"
+				"  get VARIABLE               Print current value of VARIABLE\n"
+				"  set VARIABLE VALUE         Set VARIABLE to VALUE\n"
+				"  add VARIABLE VALUE         Add VARIABLE with the given VALUE\n"
+				"  del VARIABLE [VALUE]       Remove VARIABLE [only ones with watching VALUE]\n"
 				"  start [tincd options]      Start tincd.\n"
 				"  stop                       Stop tincd.\n"
-				"  restart                    Restart tincd.\n"
+				"  restart [tincd options]    Restart tincd.\n"
 				"  reload                     Partially reload configuration of running tincd.\n"
 				"  pid                        Show PID of currently running tincd.\n"
-				"  generate-keys [bits]       Generate new RSA and ECDSA public/private keypairs.\n"
+#ifdef DISABLE_LEGACY
+				"  generate-keys              Generate a new Ed25519 public/private keypair.\n"
+#else
+				"  generate-keys [bits]       Generate new RSA and Ed25519 public/private keypairs.\n"
 				"  generate-rsa-keys [bits]   Generate a new RSA public/private keypair.\n"
-				"  generate-ecdsa-keys        Generate a new ECDSA public/private keypair.\n"
+#endif
+				"  generate-ed25519-keys      Generate a new Ed25519 public/private keypair.\n"
 				"  dump                       Dump a list of one of the following things:\n"
-				"    nodes                    - all known nodes in the VPN\n"
+				"    [reachable] nodes        - all known nodes in the VPN\n"
 				"    edges                    - all known connections in the VPN\n"
 				"    subnets                  - all known subnets in the VPN\n"
 				"    connections              - all meta connections with ourself\n"
-				"    graph                    - graph of the VPN in dotty format\n"
+				"    [di]graph                - graph of the VPN in dotty format\n"
 				"  info NODE|SUBNET|ADDRESS   Give information about a particular NODE, SUBNET or ADDRESS.\n"
 				"  purge                      Purge unreachable nodes\n"
 				"  debug N                    Set debug level\n"
@@ -141,7 +146,13 @@ static void usage(bool status) {
 				"  log [level]                Dump log output [up to the specified level]\n"
 				"  export                     Export host configuration of local node to standard output\n"
 				"  export-all                 Export all host configuration files to standard output\n"
-				"  import [--force]           Import host configuration file(s) from standard input\n"
+				"  import                     Import host configuration file(s) from standard input\n"
+				"  exchange                   Same as export followed by import\n"
+				"  exchange-all               Same as export-all followed by import\n"
+				"  invite NODE [...]          Generate an invitation for NODE\n"
+				"  join INVITATION            Join a VPN using an INVITIATION\n"
+				"  network [NETNAME]          List all known networks, or switch to the one named NETNAME.\n"
+				"  fsck                       Check the configuration files for problems.\n"
 				"\n");
 		printf("Report bugs to tinc@tinc-vpn.org.\n");
 	}
@@ -151,36 +162,41 @@ static bool parse_options(int argc, char **argv) {
 	int r;
 	int option_index = 0;
 
-	while((r = getopt_long(argc, argv, "c:n:Dd::Lo:RU:", long_options, &option_index)) != EOF) {
+	while((r = getopt_long(argc, argv, "+c:n:", long_options, &option_index)) != EOF) {
 		switch (r) {
-			case 0:				/* long option */
+			case 0:   /* long option */
+				break;
+
+			case 'b':
+				tty = false;
 				break;
 
-			case 'c':				/* config file */
+			case 'c': /* config file */
 				confbase = xstrdup(optarg);
+				confbasegiven = true;
 				break;
 
-			case 'n':				/* net name given */
+			case 'n': /* net name given */
 				netname = xstrdup(optarg);
 				break;
 
-			case 1:					/* show help */
+			case 1:   /* show help */
 				show_help = true;
 				break;
 
-			case 2:					/* show version */
+			case 2:   /* show version */
 				show_version = true;
 				break;
 
-			case 5:					/* open control socket here */
+			case 3:   /* open control socket here */
 				pidfilename = xstrdup(optarg);
 				break;
 
-			case 6:
+			case 4:   /* force */
 				force = true;
 				break;
 
-			case '?':
+			case '?': /* wrong options */
 				usage(true);
 				return false;
 
@@ -189,15 +205,15 @@ static bool parse_options(int argc, char **argv) {
 		}
 	}
 
-        if(!netname && (netname = getenv("NETNAME")))
-                netname = xstrdup(netname);
+	if(!netname && (netname = getenv("NETNAME")))
+		netname = xstrdup(netname);
 
-        /* netname "." is special: a "top-level name" */
+	/* netname "." is special: a "top-level name" */
 
-        if(netname && (!*netname || !strcmp(netname, "."))) {
-                free(netname);
-                netname = NULL;
-        }
+	if(netname && (!*netname || !strcmp(netname, "."))) {
+		free(netname);
+		netname = NULL;
+	}
 
 	if(netname && (strpbrk(netname, "\\/") || *netname == '.')) {
 		fprintf(stderr, "Invalid character in netname!\n");
@@ -207,22 +223,115 @@ static bool parse_options(int argc, char **argv) {
 	return true;
 }
 
-static FILE *ask_and_open(const char *filename, const char *what, const char *mode) {
+/* Open a file with the desired permissions, minus the umask.
+   Also, if we want to create an executable file, we call fchmod()
+   to set the executable bits. */
+
+FILE *fopenmask(const char *filename, const char *mode, mode_t perms) {
+	mode_t mask = umask(0);
+	perms &= ~mask;
+	umask(~perms);
+	FILE *f = fopen(filename, mode);
+#ifdef HAVE_FCHMOD
+	if((perms & 0444) && f)
+		fchmod(fileno(f), perms);
+#endif
+	umask(mask);
+	return f;
+}
+
+static void disable_old_keys(const char *filename, const char *what) {
+	char tmpfile[PATH_MAX] = "";
+	char buf[1024];
+	bool disabled = false;
+	bool block = false;
+	bool error = false;
+	FILE *r, *w;
+
+	r = fopen(filename, "r");
+	if(!r)
+		return;
+
+	snprintf(tmpfile, sizeof tmpfile, "%s.tmp", filename);
+
+	struct stat st = {.st_mode = 0600};
+	fstat(fileno(r), &st);
+	w = fopenmask(tmpfile, "w", st.st_mode);
+
+	while(fgets(buf, sizeof buf, r)) {
+		if(!block && !strncmp(buf, "-----BEGIN ", 11)) {
+			if((strstr(buf, " ED25519 ") && strstr(what, "Ed25519")) || (strstr(buf, " RSA ") && strstr(what, "RSA"))) {
+				disabled = true;
+				block = true;
+			}
+		}
+
+		bool ed25519pubkey = !strncasecmp(buf, "Ed25519PublicKey", 16) && strchr(" \t=", buf[16]) && strstr(what, "Ed25519");
+
+		if(ed25519pubkey)
+			disabled = true;
+
+		if(w) {
+			if(block || ed25519pubkey)
+				fputc('#', w);
+			if(fputs(buf, w) < 0) {
+				error = true;
+				break;
+			}
+		}
+
+		if(block && !strncmp(buf, "-----END ", 9))
+			block = false;
+	}
+
+	if(w)
+		if(fclose(w) < 0)
+			error = true;
+	if(ferror(r) || fclose(r) < 0)
+		error = true;
+
+	if(disabled) {
+		if(!w || error) {
+			fprintf(stderr, "Warning: old key(s) found, remove them by hand!\n");
+			if(w)
+				unlink(tmpfile);
+			return;
+		}
+
+#ifdef HAVE_MINGW
+		// We cannot atomically replace files on Windows.
+		char bakfile[PATH_MAX] = "";
+		snprintf(bakfile, sizeof bakfile, "%s.bak", filename);
+		if(rename(filename, bakfile) || rename(tmpfile, filename)) {
+			rename(bakfile, filename);
+#else
+		if(rename(tmpfile, filename)) {
+#endif
+			fprintf(stderr, "Warning: old key(s) found, remove them by hand!\n");
+		} else  {
+#ifdef HAVE_MINGW
+			unlink(bakfile);
+#endif
+			fprintf(stderr, "Warning: old key(s) found and disabled.\n");
+		}
+	}
+
+	unlink(tmpfile);
+}
+
+static FILE *ask_and_open(const char *filename, const char *what, const char *mode, bool ask, mode_t perms) {
 	FILE *r;
 	char *directory;
 	char buf[PATH_MAX];
 	char buf2[PATH_MAX];
 
 	/* Check stdin and stdout */
-	if(isatty(0) && isatty(1)) {
+	if(ask && tty) {
 		/* Ask for a file and/or directory name. */
-		fprintf(stdout, "Please enter a file to save %s to [%s]: ",
-				what, filename);
-		fflush(stdout);
+		fprintf(stderr, "Please enter a file to save %s to [%s]: ", what, filename);
 
 		if(fgets(buf, sizeof buf, stdin) == NULL) {
-			fprintf(stderr, "Error while reading stdin: %s\n",
-					strerror(errno));
+			fprintf(stderr, "Error while reading stdin: %s\n", strerror(errno));
 			return NULL;
 		}
 
@@ -245,11 +354,11 @@ static FILE *ask_and_open(const char *filename, const char *what, const char *mo
 		filename = buf2;
 	}
 
-	umask(0077);				/* Disallow everything for group and other */
+	disable_old_keys(filename, what);
 
 	/* Open it first to keep the inode busy */
 
-	r = fopen(filename, mode);
+	r = fopenmask(filename, mode, perms);
 
 	if(!r) {
 		fprintf(stderr, "Error opening file `%s': %s\n", filename, strerror(errno));
@@ -260,186 +369,139 @@ static FILE *ask_and_open(const char *filename, const char *what, const char *mo
 }
 
 /*
-  Generate a public/private ECDSA keypair, and ask for a file to store
+  Generate a public/private Ed25519 keypair, and ask for a file to store
   them in.
 */
-static bool ecdsa_keygen() {
-	ecdsa_t key;
+static bool ed25519_keygen(bool ask) {
+	ecdsa_t *key;
 	FILE *f;
-	char *filename;
+	char *pubname, *privname;
 
-	fprintf(stderr, "Generating ECDSA keypair:\n");
+	fprintf(stderr, "Generating Ed25519 keypair:\n");
 
-	if(!ecdsa_generate(&key)) {
+	if(!(key = ecdsa_generate())) {
 		fprintf(stderr, "Error during key generation!\n");
 		return false;
 	} else
 		fprintf(stderr, "Done.\n");
 
-	xasprintf(&filename, "%s" SLASH "ecdsa_key.priv", confbase);
-	f = ask_and_open(filename, "private ECDSA key", "a");
+	xasprintf(&privname, "%s" SLASH "ed25519_key.priv", confbase);
+	f = ask_and_open(privname, "private Ed25519 key", "a", ask, 0600);
+	free(privname);
 
 	if(!f)
 		return false;
-  
-#ifdef HAVE_FCHMOD
-	/* Make it unreadable for others. */
-	fchmod(fileno(f), 0600);
-#endif
-		
-	if(ftell(f))
-		fprintf(stderr, "Appending key to existing contents.\nMake sure only one key is stored in the file.\n");
 
-	ecdsa_write_pem_private_key(&key, f);
+	if(!ecdsa_write_pem_private_key(key, f)) {
+		fprintf(stderr, "Error writing private key!\n");
+		ecdsa_free(key);
+		fclose(f);
+		return false;
+	}
 
 	fclose(f);
-	free(filename);
 
 	if(name)
-		xasprintf(&filename, "%s" SLASH "hosts" SLASH "%s", confbase, name);
+		xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, name);
 	else
-		xasprintf(&filename, "%s" SLASH "ecdsa_key.pub", confbase);
+		xasprintf(&pubname, "%s" SLASH "ed25519_key.pub", confbase);
 
-	f = ask_and_open(filename, "public ECDSA key", "a");
+	f = ask_and_open(pubname, "public Ed25519 key", "a", ask, 0666);
+	free(pubname);
 
 	if(!f)
 		return false;
 
-	if(ftell(f))
-		fprintf(stderr, "Appending key to existing contents.\nMake sure only one key is stored in the file.\n");
-
-	char *pubkey = ecdsa_get_base64_public_key(&key);
-	fprintf(f, "ECDSAPublicKey = %s\n", pubkey);
+	char *pubkey = ecdsa_get_base64_public_key(key);
+	fprintf(f, "Ed25519PublicKey = %s\n", pubkey);
 	free(pubkey);
 
 	fclose(f);
-	free(filename);
+	ecdsa_free(key);
 
 	return true;
 }
 
+#ifndef DISABLE_LEGACY
 /*
   Generate a public/private RSA keypair, and ask for a file to store
   them in.
 */
-static bool rsa_keygen(int bits) {
-	rsa_t key;
+static bool rsa_keygen(int bits, bool ask) {
+	rsa_t *key;
 	FILE *f;
-	char *filename;
+	char *pubname, *privname;
+
+	// Make sure the key size is a multiple of 8 bits.
+	bits &= ~0x7;
+
+	// Force them to be between 1024 and 8192 bits long.
+	if(bits < 1024)
+		bits = 1024;
+	if(bits > 8192)
+		bits = 8192;
 
 	fprintf(stderr, "Generating %d bits keys:\n", bits);
 
-	if(!rsa_generate(&key, bits, 0x10001)) {
+	if(!(key = rsa_generate(bits, 0x10001))) {
 		fprintf(stderr, "Error during key generation!\n");
 		return false;
 	} else
 		fprintf(stderr, "Done.\n");
 
-	xasprintf(&filename, "%s" SLASH "rsa_key.priv", confbase);
-	f = ask_and_open(filename, "private RSA key", "a");
+	xasprintf(&privname, "%s" SLASH "rsa_key.priv", confbase);
+	f = ask_and_open(privname, "private RSA key", "a", ask, 0600);
+	free(privname);
 
 	if(!f)
 		return false;
-  
-#ifdef HAVE_FCHMOD
-	/* Make it unreadable for others. */
-	fchmod(fileno(f), 0600);
-#endif
-		
-	if(ftell(f))
-		fprintf(stderr, "Appending key to existing contents.\nMake sure only one key is stored in the file.\n");
 
-	rsa_write_pem_private_key(&key, f);
+	if(!rsa_write_pem_private_key(key, f)) {
+		fprintf(stderr, "Error writing private key!\n");
+		fclose(f);
+		rsa_free(key);
+		return false;
+	}
 
 	fclose(f);
-	free(filename);
 
 	if(name)
-		xasprintf(&filename, "%s" SLASH "hosts" SLASH "%s", confbase, name);
+		xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, name);
 	else
-		xasprintf(&filename, "%s" SLASH "rsa_key.pub", confbase);
+		xasprintf(&pubname, "%s" SLASH "rsa_key.pub", confbase);
 
-	f = ask_and_open(filename, "public RSA key", "a");
+	f = ask_and_open(pubname, "public RSA key", "a", ask, 0666);
+	free(pubname);
 
 	if(!f)
 		return false;
 
-	if(ftell(f))
-		fprintf(stderr, "Appending key to existing contents.\nMake sure only one key is stored in the file.\n");
-
-	rsa_write_pem_public_key(&key, f);
+	if(!rsa_write_pem_public_key(key, f)) {
+		fprintf(stderr, "Error writing public key!\n");
+		fclose(f);
+		rsa_free(key);
+		return false;
+	}
 
 	fclose(f);
-	free(filename);
+	rsa_free(key);
 
 	return true;
 }
-
-/*
-  Set all files and paths according to netname
-*/
-static void make_names(void) {
-#ifdef HAVE_MINGW
-	HKEY key;
-	char installdir[1024] = "";
-	long len = sizeof installdir;
-#endif
-
-	if(netname)
-		xasprintf(&identname, "tinc.%s", netname);
-	else
-		identname = xstrdup("tinc");
-
-#ifdef HAVE_MINGW
-	if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
-		if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
-			if(!confbase) {
-				if(netname)
-					xasprintf(&confbase, "%s" SLASH "%s", installdir, netname);
-				else
-					xasprintf(&confbase, "%s", installdir);
-			}
-		}
-		if(!pidfilename)
-			xasprintf(&pidfilename, "%s" SLASH "pid", confbase);
-		RegCloseKey(key);
-	}
-
-	if(!*installdir) {
 #endif
-	confdir = xstrdup(CONFDIR);
-
-	if(!pidfilename)
-		xasprintf(&pidfilename, "%s" SLASH "run" SLASH "%s.pid", LOCALSTATEDIR, identname);
-
-	if(netname) {
-		if(!confbase)
-			xasprintf(&confbase, CONFDIR SLASH "tinc" SLASH "%s", netname);
-		else
-			fprintf(stderr, "Both netname and configuration directory given, using the latter...\n");
-	} else {
-		if(!confbase)
-			xasprintf(&confbase, CONFDIR SLASH "tinc");
-	}
 
-#ifdef HAVE_MINGW
-	} else
-		confdir = xstrdup(installdir);
-#endif
-
-	xasprintf(&tinc_conf, "%s" SLASH "tinc.conf", confbase);
-	xasprintf(&hosts_dir, "%s" SLASH "hosts", confbase);
-}
-
-static char buffer[4096];
-static size_t blen = 0;
+char buffer[4096];
+size_t blen = 0;
 
 bool recvline(int fd, char *line, size_t len) {
 	char *newline = NULL;
 
+	if(!fd)
+		abort();
+
 	while(!(newline = memchr(buffer, '\n', blen))) {
 		int result = recv(fd, buffer + blen, sizeof buffer - blen, 0);
-		if(result == -1 && errno == EINTR)
+		if(result == -1 && sockerrno == EINTR)
 			continue;
 		else if(result <= 0)
 			return false;
@@ -459,10 +521,13 @@ bool recvline(int fd, char *line, size_t len) {
 	return true;
 }
 
-static bool recvdata(int fd, char *data, size_t len) {
+bool recvdata(int fd, char *data, size_t len) {
+	if(len == -1)
+		len = blen;
+
 	while(blen < len) {
 		int result = recv(fd, buffer + blen, sizeof buffer - blen, 0);
-		if(result == -1 && errno == EINTR)
+		if(result == -1 && sockerrno == EINTR)
 			continue;
 		else if(result <= 0)
 			return false;
@@ -493,8 +558,8 @@ bool sendline(int fd, char *format, ...) {
 	blen++;
 
 	while(blen) {
-		int result = send(fd, p, blen, 0);
-		if(result == -1 && errno == EINTR)
+		int result = send(fd, p, blen, MSG_NOSIGNAL);
+		if(result == -1 && sockerrno == EINTR)
 			continue;
 		else if(result <= 0)
 			return false;
@@ -502,7 +567,7 @@ bool sendline(int fd, char *format, ...) {
 		blen -= result;
 	}
 
-	return true;	
+	return true;
 }
 
 static void pcap(int fd, FILE *out, int snaplen) {
@@ -609,31 +674,60 @@ static bool remove_service(void) {
 }
 #endif
 
-static bool connect_tincd() {
-	if(fd >= 0)
-		return true;
+bool connect_tincd(bool verbose) {
+	if(fd >= 0) {
+		fd_set r;
+		FD_ZERO(&r);
+		FD_SET(fd, &r);
+		struct timeval tv = {0, 0};
+		if(select(fd + 1, &r, NULL, NULL, &tv)) {
+			fprintf(stderr, "Previous connection to tincd lost, reconnecting.\n");
+			close(fd);
+			fd = -1;
+		} else {
+			return true;
+		}
+	}
 
 	FILE *f = fopen(pidfilename, "r");
 	if(!f) {
-		fprintf(stderr, "Could not open pid file %s: %s\n", pidfilename, strerror(errno));
+		if(verbose)
+			fprintf(stderr, "Could not open pid file %s: %s\n", pidfilename, strerror(errno));
 		return false;
 	}
 
-	char host[128];
-	char port[128];
+	char host[129];
+	char port[129];
 
 	if(fscanf(f, "%20d %1024s %128s port %128s", &pid, controlcookie, host, port) != 4) {
-		fprintf(stderr, "Could not parse pid file %s\n", pidfilename);
+		if(verbose)
+			fprintf(stderr, "Could not parse pid file %s\n", pidfilename);
+		fclose(f);
 		return false;
 	}
 
-#ifdef HAVE_MINGW
-	if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
-		fprintf(stderr, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
+	fclose(f);
+
+#ifndef HAVE_MINGW
+	struct sockaddr_un sa;
+	sa.sun_family = AF_UNIX;
+	strncpy(sa.sun_path, unixsocketname, sizeof sa.sun_path);
+
+	fd = socket(AF_UNIX, SOCK_STREAM, 0);
+	if(fd < 0) {
+		if(verbose)
+			fprintf(stderr, "Cannot create UNIX socket: %s\n", sockstrerror(sockerrno));
 		return false;
 	}
-#endif
 
+	if(connect(fd, (struct sockaddr *)&sa, sizeof sa) < 0) {
+		if(verbose)
+			fprintf(stderr, "Cannot connect to UNIX socket %s: %s\n", unixsocketname, sockstrerror(sockerrno));
+		close(fd);
+		fd = -1;
+		return false;
+	}
+#else
 	struct addrinfo hints = {
 		.ai_family = AF_UNSPEC,
 		.ai_socktype = SOCK_STREAM,
@@ -644,13 +738,15 @@ static bool connect_tincd() {
 	struct addrinfo *res = NULL;
 
 	if(getaddrinfo(host, port, &hints, &res) || !res) {
-		fprintf(stderr, "Cannot resolve %s port %s: %s", host, port, strerror(errno));
+		if(verbose)
+			fprintf(stderr, "Cannot resolve %s port %s: %s", host, port, sockstrerror(sockerrno));
 		return false;
 	}
 
 	fd = socket(res->ai_family, SOCK_STREAM, IPPROTO_TCP);
 	if(fd < 0) {
-		fprintf(stderr, "Cannot create TCP socket: %s\n", sockstrerror(sockerrno));
+		if(verbose)
+			fprintf(stderr, "Cannot create TCP socket: %s\n", sockstrerror(sockerrno));
 		return false;
 	}
 
@@ -658,29 +754,45 @@ static bool connect_tincd() {
 	unsigned long arg = 0;
 
 	if(ioctlsocket(fd, FIONBIO, &arg) != 0) {
-		fprintf(stderr, "ioctlsocket failed: %s", sockstrerror(sockerrno));
+		if(verbose)
+			fprintf(stderr, "ioctlsocket failed: %s", sockstrerror(sockerrno));
 	}
 #endif
 
 	if(connect(fd, res->ai_addr, res->ai_addrlen) < 0) {
-		fprintf(stderr, "Cannot connect to %s port %s: %s\n", host, port, sockstrerror(sockerrno));
+		if(verbose)
+			fprintf(stderr, "Cannot connect to %s port %s: %s\n", host, port, sockstrerror(sockerrno));
+		close(fd);
+		fd = -1;
 		return false;
 	}
 
 	freeaddrinfo(res);
+#endif
+
+#ifdef SO_NOSIGPIPE
+	static const int one = 1;
+	setsockopt(fd, SOL_SOCKET, SO_NOSIGPIPE, (void *)&one, sizeof one);
+#endif
 
 	char data[4096];
 	int version;
 
 	if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %s %d", &code, data, &version) != 3 || code != 0) {
-		fprintf(stderr, "Cannot read greeting from control socket: %s\n", sockstrerror(sockerrno));
+		if(verbose)
+			fprintf(stderr, "Cannot read greeting from control socket: %s\n", sockstrerror(sockerrno));
+		close(fd);
+		fd = -1;
 		return false;
 	}
 
 	sendline(fd, "%d ^%s %d", ID, controlcookie, TINC_CTL_VERSION_CURRENT);
-	
+
 	if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &version, &pid) != 3 || code != 4 || version != TINC_CTL_VERSION_CURRENT) {
-		fprintf(stderr, "Could not fully establish control socket connection\n");
+		if(verbose)
+			fprintf(stderr, "Could not fully establish control socket connection\n");
+		close(fd);
+		fd = -1;
 		return false;
 	}
 
@@ -689,42 +801,102 @@ static bool connect_tincd() {
 
 
 static int cmd_start(int argc, char *argv[]) {
-	int i, j;
-	char *c;
+	if(connect_tincd(false)) {
+		if(netname)
+			fprintf(stderr, "A tincd is already running for net `%s' with pid %d.\n", netname, pid);
+		else
+			fprintf(stderr, "A tincd is already running with pid %d.\n", pid);
+		return 0;
+	}
 
-	argc += optind;
-	argv -= optind;
-	char *slash = strrchr(argv[0], '/');
+	char *c;
+	char *slash = strrchr(program_name, '/');
 
 #ifdef HAVE_MINGW
-	if ((c = strrchr(argv[0], '\\')) > slash)
+	if ((c = strrchr(program_name, '\\')) > slash)
 		slash = c;
 #endif
 
 	if (slash++)
-		xasprintf(&c, "%.*stincd", (int)(slash - argv[0]), argv[0]);
+		xasprintf(&c, "%.*stincd", (int)(slash - program_name), program_name);
 	else
 		c = "tincd";
 
-	argv[0] = c;
+	int nargc = 0;
+	char **nargv = xzalloc((optind + argc) * sizeof *nargv);
 
-	for(i = j = 1; argv[i]; ++i)
-		if (i != optind && strcmp(argv[i], "--") != 0)
-			argv[j++] = argv[i];
+	char *arg0 = c;
+#ifdef HAVE_MINGW
+	/*
+	   Windows has no real concept of an "argv array". A command line is just one string.
+	   The CRT of the new process will decode the command line string to generate argv before calling main(), and (by convention)
+	   it uses quotes to handle spaces in arguments.
+	   Therefore we need to quote all arguments that might contain spaces. No, execvp() won't do that for us (see MSDN).
+	   If we don't do that, then execvp() will run fine but any spaces in the filename contained in arg0 will bleed
+	   into the next arguments when the spawned process' CRT parses its command line, resulting in chaos.
+	*/
+	xasprintf(&arg0, "\"%s\"", arg0);
+#endif
+	nargv[nargc++] = arg0;
+	for(int i = 1; i < optind; i++)
+		nargv[nargc++] = orig_argv[i];
+	for(int i = 1; i < argc; i++)
+		nargv[nargc++] = argv[i];
 
-	argv[j] = NULL;
-	execvp(c, argv);
-	fprintf(stderr, "Could not start %s: %s\n", c, strerror(errno));
-	return 1;
+#ifdef HAVE_MINGW
+	int status = spawnvp(_P_WAIT, c, nargv);
+	if (status == -1) {
+		fprintf(stderr, "Error starting %s: %s\n", c, strerror(errno));
+		return 1;
+	}
+	return status;
+#else
+	pid_t pid = fork();
+	if(pid == -1) {
+		fprintf(stderr, "Could not fork: %s\n", strerror(errno));
+		free(nargv);
+		return 1;
+	}
+
+	if(!pid)
+		exit(execvp(c, nargv));
+
+	free(nargv);
+
+	int status = -1, result;
+#ifdef SIGINT
+	signal(SIGINT, SIG_IGN);
+#endif
+	result = waitpid(pid, &status, 0);
+#ifdef SIGINT
+	signal(SIGINT, SIG_DFL);
+#endif
+
+	if(result != pid || !WIFEXITED(status) || WEXITSTATUS(status)) {
+		fprintf(stderr, "Error starting %s\n", c);
+		return 1;
+	}
+
+	return 0;
+#endif
 }
 
 static int cmd_stop(int argc, char *argv[]) {
+	if(argc > 1) {
+		fprintf(stderr, "Too many arguments!\n");
+		return 1;
+	}
+
 #ifndef HAVE_MINGW
-	if(!connect_tincd()) {
+	if(!connect_tincd(true)) {
 		if(pid) {
-			if(kill(pid, SIGTERM)) 
+			if(kill(pid, SIGTERM)) {
+				fprintf(stderr, "Could not send TERM signal to process with PID %u: %s\n", pid, strerror(errno));
 				return 1;
+			}
+
 			fprintf(stderr, "Sent TERM signal to process with PID %u.\n", pid);
+			waitpid(pid, NULL, 0);
 			return 0;
 		}
 
@@ -732,24 +904,33 @@ static int cmd_stop(int argc, char *argv[]) {
 	}
 
 	sendline(fd, "%d %d", CONTROL, REQ_STOP);
-	if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_STOP || result) {
-		fprintf(stderr, "Could not stop tinc daemon.\n");
-		return 1;
+
+	while(recvline(fd, line, sizeof line)) {
+		// Wait for tincd to close the connection...
 	}
 #else
 	if(!remove_service())
 		return 1;
 #endif
+	close(fd);
+	pid = 0;
+	fd = -1;
+
 	return 0;
 }
 
 static int cmd_restart(int argc, char *argv[]) {
-	cmd_stop(argc, argv);
+	cmd_stop(1, argv);
 	return cmd_start(argc, argv);
 }
 
 static int cmd_reload(int argc, char *argv[]) {
-	if(!connect_tincd())
+	if(argc > 1) {
+		fprintf(stderr, "Too many arguments!\n");
+		return 1;
+	}
+
+	if(!connect_tincd(true))
 		return 1;
 
 	sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
@@ -763,16 +944,29 @@ static int cmd_reload(int argc, char *argv[]) {
 }
 
 static int cmd_dump(int argc, char *argv[]) {
+	bool only_reachable = false;
+
+	if(argc > 2 && !strcasecmp(argv[1], "reachable")) {
+		if(strcasecmp(argv[2], "nodes")) {
+			fprintf(stderr, "`reachable' only supported for nodes.\n");
+			usage(true);
+			return 1;
+		}
+		only_reachable = true;
+		argv++;
+		argc--;
+	}
+
 	if(argc != 2) {
 		fprintf(stderr, "Invalid number of arguments.\n");
 		usage(true);
 		return 1;
 	}
 
-	if(!connect_tincd())
+	if(!connect_tincd(true))
 		return 1;
 
-	bool do_graph = false;
+	int do_graph = 0;
 
 	if(!strcasecmp(argv[1], "nodes"))
 		sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
@@ -785,19 +979,25 @@ static int cmd_dump(int argc, char *argv[]) {
 	else if(!strcasecmp(argv[1], "graph")) {
 		sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
 		sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
-		do_graph = true;
+		do_graph = 1;
+	} else if(!strcasecmp(argv[1], "digraph")) {
+		sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
+		sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
+		do_graph = 2;
 	} else {
 		fprintf(stderr, "Unknown dump type '%s'.\n", argv[1]);
 		usage(true);
 		return 1;
 	}
 
-	if(do_graph)
+	if(do_graph == 1)
+		printf("graph {\n");
+	else if(do_graph == 2)
 		printf("digraph {\n");
 
 	while(recvline(fd, line, sizeof line)) {
 		char node1[4096], node2[4096];
-		int n = sscanf(line, "%d %d %s to %s", &code, &req, node1, node2);
+		int n = sscanf(line, "%d %d %s %s", &code, &req, node1, node2);
 		if(n == 2) {
 			if(do_graph && req == REQ_DUMP_NODES)
 				continue;
@@ -810,13 +1010,93 @@ static int cmd_dump(int argc, char *argv[]) {
 		if(n < 2)
 			break;
 
-		if(!do_graph)
-			printf("%s\n", line + 5);
-		else {
-			if(req == REQ_DUMP_NODES)
-				printf(" %s [label = \"%s\"];\n", node1, node1);
-			else
-				printf(" %s -> %s;\n", node1, node2);
+		char node[4096];
+		char id[4096];
+		char from[4096];
+		char to[4096];
+		char subnet[4096];
+		char host[4096];
+		char port[4096];
+		char local_host[4096];
+		char local_port[4096];
+		char via[4096];
+		char nexthop[4096];
+		int cipher, digest, maclength, compression, distance, socket, weight;
+		short int pmtu, minmtu, maxmtu;
+		unsigned int options, status_int;
+		node_status_t status;
+		long int last_state_change;
+
+		switch(req) {
+			case REQ_DUMP_NODES: {
+				int n = sscanf(line, "%*d %*d %s %s %s port %s %d %d %d %d %x %x %s %s %d %hd %hd %hd %ld", node, id, host, port, &cipher, &digest, &maclength, &compression, &options, &status_int, nexthop, via, &distance, &pmtu, &minmtu, &maxmtu, &last_state_change);
+				if(n != 17) {
+					fprintf(stderr, "Unable to parse node dump from tincd: %s\n", line);
+					return 1;
+				}
+
+				memcpy(&status, &status_int, sizeof status);
+
+				if(do_graph) {
+					const char *color = "black";
+					if(!strcmp(host, "MYSELF"))
+						color = "green";
+					else if(!status.reachable)
+						color = "red";
+					else if(strcmp(via, node))
+						color = "orange";
+					else if(!status.validkey)
+						color = "black";
+					else if(minmtu > 0)
+						color = "green";
+					printf(" %s [label = \"%s\", color = \"%s\"%s];\n", node, node, color, strcmp(host, "MYSELF") ? "" : ", style = \"filled\"");
+				} else {
+					if(only_reachable && !status.reachable)
+						continue;
+					printf("%s id %s at %s port %s cipher %d digest %d maclength %d compression %d options %x status %04x nexthop %s via %s distance %d pmtu %hd (min %hd max %hd)\n",
+							node, id, host, port, cipher, digest, maclength, compression, options, status_int, nexthop, via, distance, pmtu, minmtu, maxmtu);
+				}
+			} break;
+
+			case REQ_DUMP_EDGES: {
+				int n = sscanf(line, "%*d %*d %s %s %s port %s %s port %s %x %d", from, to, host, port, local_host, local_port, &options, &weight);
+				if(n != 8) {
+					fprintf(stderr, "Unable to parse edge dump from tincd.\n");
+					return 1;
+				}
+
+				if(do_graph) {
+					float w = 1 + 65536.0 / weight;
+					if(do_graph == 1 && strcmp(node1, node2) > 0)
+						printf(" %s -- %s [w = %f, weight = %f];\n", node1, node2, w, w);
+					else if(do_graph == 2)
+						printf(" %s -> %s [w = %f, weight = %f];\n", node1, node2, w, w);
+				} else {
+					printf("%s to %s at %s port %s local %s port %s options %x weight %d\n", from, to, host, port, local_host, local_port, options, weight);
+				}
+			} break;
+
+			case REQ_DUMP_SUBNETS: {
+				int n = sscanf(line, "%*d %*d %s %s", subnet, node);
+				if(n != 2) {
+					fprintf(stderr, "Unable to parse subnet dump from tincd.\n");
+					return 1;
+				}
+				printf("%s owner %s\n", strip_weight(subnet), node);
+			} break;
+
+			case REQ_DUMP_CONNECTIONS: {
+				int n = sscanf(line, "%*d %*d %s %s port %s %x %d %x", node, host, port, &options, &socket, &status_int);
+				if(n != 6) {
+					fprintf(stderr, "Unable to parse connection dump from tincd.\n");
+					return 1;
+				}
+				printf("%s at %s port %s options %x socket %d status %x\n", node, host, port, options, socket, status_int);
+			} break;
+
+			default:
+				fprintf(stderr, "Unable to parse dump from tincd.\n");
+				return 1;
 		}
 	}
 
@@ -825,7 +1105,12 @@ static int cmd_dump(int argc, char *argv[]) {
 }
 
 static int cmd_purge(int argc, char *argv[]) {
-	if(!connect_tincd())
+	if(argc > 1) {
+		fprintf(stderr, "Too many arguments!\n");
+		return 1;
+	}
+
+	if(!connect_tincd(true))
 		return 1;
 
 	sendline(fd, "%d %d", CONTROL, REQ_PURGE);
@@ -843,7 +1128,7 @@ static int cmd_debug(int argc, char *argv[]) {
 		return 1;
 	}
 
-	if(!connect_tincd())
+	if(!connect_tincd(true))
 		return 1;
 
 	int debuglevel = atoi(argv[1]);
@@ -860,7 +1145,12 @@ static int cmd_debug(int argc, char *argv[]) {
 }
 
 static int cmd_retry(int argc, char *argv[]) {
-	if(!connect_tincd())
+	if(argc > 1) {
+		fprintf(stderr, "Too many arguments!\n");
+		return 1;
+	}
+
+	if(!connect_tincd(true))
 		return 1;
 
 	sendline(fd, "%d %d", CONTROL, REQ_RETRY);
@@ -878,12 +1168,12 @@ static int cmd_connect(int argc, char *argv[]) {
 		return 1;
 	}
 
-	if(!check_id(argv[2])) {
+	if(!check_id(argv[1])) {
 		fprintf(stderr, "Invalid name for node.\n");
 		return 1;
 	}
 
-	if(!connect_tincd())
+	if(!connect_tincd(true))
 		return 1;
 
 	sendline(fd, "%d %d %s", CONTROL, REQ_CONNECT, argv[1]);
@@ -901,12 +1191,12 @@ static int cmd_disconnect(int argc, char *argv[]) {
 		return 1;
 	}
 
-	if(!check_id(argv[2])) {
+	if(!check_id(argv[1])) {
 		fprintf(stderr, "Invalid name for node.\n");
 		return 1;
 	}
 
-	if(!connect_tincd())
+	if(!connect_tincd(true))
 		return 1;
 
 	sendline(fd, "%d %d %s", CONTROL, REQ_DISCONNECT, argv[1]);
@@ -919,53 +1209,92 @@ static int cmd_disconnect(int argc, char *argv[]) {
 }
 
 static int cmd_top(int argc, char *argv[]) {
+	if(argc > 1) {
+		fprintf(stderr, "Too many arguments!\n");
+		return 1;
+	}
+
 #ifdef HAVE_CURSES
-	if(!connect_tincd())
+	if(!connect_tincd(true))
 		return 1;
 
 	top(fd);
 	return 0;
 #else
-	fprintf(stderr, "This version of tincctl was compiled without support for the curses library.\n");
+	fprintf(stderr, "This version of tinc was compiled without support for the curses library.\n");
 	return 1;
 #endif
 }
 
 static int cmd_pcap(int argc, char *argv[]) {
-	if(!connect_tincd())
+	if(argc > 2) {
+		fprintf(stderr, "Too many arguments!\n");
+		return 1;
+	}
+
+	if(!connect_tincd(true))
 		return 1;
 
 	pcap(fd, stdout, argc > 1 ? atoi(argv[1]) : 0);
 	return 0;
 }
 
+#ifdef SIGINT
+static void sigint_handler(int sig) {
+	fprintf(stderr, "\n");
+	shutdown(fd, SHUT_RDWR);
+}
+#endif
+
 static int cmd_log(int argc, char *argv[]) {
-	if(!connect_tincd())
+	if(argc > 2) {
+		fprintf(stderr, "Too many arguments!\n");
 		return 1;
+	}
+
+	if(!connect_tincd(true))
+		return 1;
+
+#ifdef SIGINT
+	signal(SIGINT, sigint_handler);
+#endif
 
 	logcontrol(fd, stdout, argc > 1 ? atoi(argv[1]) : -1);
+
+#ifdef SIGINT
+	signal(SIGINT, SIG_DFL);
+#endif
+
+	close(fd);
+	fd = -1;
 	return 0;
 }
 
 static int cmd_pid(int argc, char *argv[]) {
-	if(!connect_tincd() && !pid)
+	if(argc > 1) {
+		fprintf(stderr, "Too many arguments!\n");
+		return 1;
+	}
+
+	if(!connect_tincd(true) && !pid)
 		return 1;
 
 	printf("%d\n", pid);
 	return 0;
 }
 
-static int rstrip(char *value) {
+int rstrip(char *value) {
 	int len = strlen(value);
 	while(len && strchr("\t\r\n ", value[len - 1]))
 		value[--len] = 0;
 	return len;
 }
 
-static char *get_my_name() {
+char *get_my_name(bool verbose) {
 	FILE *f = fopen(tinc_conf, "r");
 	if(!f) {
-		fprintf(stderr, "Could not open %s: %s\n", tinc_conf, strerror(errno));
+		if(verbose)
+			fprintf(stderr, "Could not open %s: %s\n", tinc_conf, strerror(errno));
 		return NULL;
 	}
 
@@ -986,47 +1315,45 @@ static char *get_my_name() {
 			continue;
 		if(*value) {
 			fclose(f);
-			return strdup(value);
+			return replace_name(value);
 		}
 	}
 
 	fclose(f);
-	fprintf(stderr, "Could not find Name in %s.\n", tinc_conf);
+	if(verbose)
+		fprintf(stderr, "Could not find Name in %s.\n", tinc_conf);
 	return NULL;
 }
 
-#define VAR_SERVER 1    /* Should be in tinc.conf */
-#define VAR_HOST 2      /* Can be in host config file */
-#define VAR_MULTIPLE 4  /* Multiple statements allowed */
-#define VAR_OBSOLETE 8  /* Should not be used anymore */
-
-static struct {
-	const char *name;
-	int type;
-} const variables[] = {
+const var_t variables[] = {
 	/* Server configuration */
 	{"AddressFamily", VAR_SERVER},
+	{"AutoConnect", VAR_SERVER | VAR_SAFE},
 	{"BindToAddress", VAR_SERVER | VAR_MULTIPLE},
 	{"BindToInterface", VAR_SERVER},
-	{"Broadcast", VAR_SERVER},
-	{"ConnectTo", VAR_SERVER | VAR_MULTIPLE},
+	{"Broadcast", VAR_SERVER | VAR_SAFE},
+	{"BroadcastSubnet", VAR_SERVER | VAR_MULTIPLE | VAR_SAFE},
+	{"ConnectTo", VAR_SERVER | VAR_MULTIPLE | VAR_SAFE},
 	{"DecrementTTL", VAR_SERVER},
 	{"Device", VAR_SERVER},
+	{"DeviceStandby", VAR_SERVER},
 	{"DeviceType", VAR_SERVER},
 	{"DirectOnly", VAR_SERVER},
-	{"ECDSAPrivateKeyFile", VAR_SERVER},
+	{"Ed25519PrivateKeyFile", VAR_SERVER},
 	{"ExperimentalProtocol", VAR_SERVER},
 	{"Forwarding", VAR_SERVER},
-	{"GraphDumpFile", VAR_SERVER},
+	{"GraphDumpFile", VAR_SERVER | VAR_OBSOLETE},
 	{"Hostnames", VAR_SERVER},
 	{"IffOneQueue", VAR_SERVER},
 	{"Interface", VAR_SERVER},
 	{"KeyExpire", VAR_SERVER},
+	{"ListenAddress", VAR_SERVER | VAR_MULTIPLE},
 	{"LocalDiscovery", VAR_SERVER},
 	{"MACExpire", VAR_SERVER},
+	{"MaxConnectionBurst", VAR_SERVER},
 	{"MaxOutputBufferSize", VAR_SERVER},
 	{"MaxTimeout", VAR_SERVER},
-	{"Mode", VAR_SERVER},
+	{"Mode", VAR_SERVER | VAR_SAFE},
 	{"Name", VAR_SERVER},
 	{"PingInterval", VAR_SERVER},
 	{"PingTimeout", VAR_SERVER},
@@ -1036,8 +1363,16 @@ static struct {
 	{"ProcessPriority", VAR_SERVER},
 	{"Proxy", VAR_SERVER},
 	{"ReplayWindow", VAR_SERVER},
+	{"ScriptsExtension", VAR_SERVER},
+	{"ScriptsInterpreter", VAR_SERVER},
 	{"StrictSubnets", VAR_SERVER},
 	{"TunnelServer", VAR_SERVER},
+	{"UDPDiscovery", VAR_SERVER},
+	{"UDPDiscoveryKeepaliveInterval", VAR_SERVER},
+	{"UDPDiscoveryInterval", VAR_SERVER},
+	{"UDPDiscoveryTimeout", VAR_SERVER},
+	{"MTUInfoInterval", VAR_SERVER},
+	{"UDPInfoInterval", VAR_SERVER},
 	{"UDPRcvBuf", VAR_SERVER},
 	{"UDPSndBuf", VAR_SERVER},
 	{"VDEGroup", VAR_SERVER},
@@ -1048,8 +1383,8 @@ static struct {
 	{"ClampMSS", VAR_SERVER | VAR_HOST},
 	{"Compression", VAR_SERVER | VAR_HOST},
 	{"Digest", VAR_SERVER | VAR_HOST},
-	{"ECDSAPublicKey", VAR_HOST},
-	{"ECDSAPublicKeyFile", VAR_SERVER | VAR_HOST},
+	{"Ed25519PublicKey", VAR_HOST},
+	{"Ed25519PublicKeyFile", VAR_SERVER | VAR_HOST},
 	{"IndirectData", VAR_SERVER | VAR_HOST},
 	{"MACLength", VAR_SERVER | VAR_HOST},
 	{"PMTU", VAR_SERVER | VAR_HOST},
@@ -1057,9 +1392,9 @@ static struct {
 	{"Port", VAR_HOST},
 	{"PublicKey", VAR_HOST | VAR_OBSOLETE},
 	{"PublicKeyFile", VAR_SERVER | VAR_HOST | VAR_OBSOLETE},
-	{"Subnet", VAR_HOST | VAR_MULTIPLE},
+	{"Subnet", VAR_HOST | VAR_MULTIPLE | VAR_SAFE},
 	{"TCPOnly", VAR_SERVER | VAR_HOST},
-	{"Weight", VAR_HOST},
+	{"Weight", VAR_HOST | VAR_SAFE},
 	{NULL, 0}
 };
 
@@ -1069,6 +1404,9 @@ static int cmd_config(int argc, char *argv[]) {
 		return 1;
 	}
 
+	if(strcasecmp(argv[0], "config"))
+		argv--, argc++;
+
 	int action = -2;
 	if(!strcasecmp(argv[1], "get")) {
 		argv++, argc--;
@@ -1098,14 +1436,14 @@ static int cmd_config(int argc, char *argv[]) {
 	char *value;
 	int len;
 
-        len = strcspn(line, "\t =");
-        value = line + len;
-        value += strspn(value, "\t ");
-        if(*value == '=') {
-                value++;
-                value += strspn(value, "\t ");
-        }
-        line[len] = '\0';
+	len = strcspn(line, "\t =");
+	value = line + len;
+	value += strspn(value, "\t ");
+	if(*value == '=') {
+		value++;
+		value += strspn(value, "\t ");
+	}
+	line[len] = '\0';
 	variable = strchr(line, '.');
 	if(variable) {
 		node = line;
@@ -1129,6 +1467,7 @@ static int cmd_config(int argc, char *argv[]) {
 
 	/* Some simple checks. */
 	bool found = false;
+	bool warnonremove = false;
 
 	for(int i = 0; variables[i].name; i++) {
 		if(strcasecmp(variables[i].name, variable))
@@ -1162,11 +1501,21 @@ static int cmd_config(int argc, char *argv[]) {
 		/* Should this go into our own host config file? */
 
 		if(!node && !(variables[i].type & VAR_SERVER)) {
-			node = get_my_name();
+			node = get_my_name(true);
 			if(!node)
 				return 1;
 		}
 
+		/* Change "add" into "set" for variables that do not allow multiple occurences.
+		   Turn on warnings when it seems variables might be removed unintentionally. */
+
+		if(action == 1 && !(variables[i].type & VAR_MULTIPLE)) {
+			warnonremove = true;
+			action = 0;
+		} else if(action == 0 && (variables[i].type & VAR_MULTIPLE)) {
+			warnonremove = true;
+		}
+
 		break;
 	}
 
@@ -1193,19 +1542,8 @@ static int cmd_config(int argc, char *argv[]) {
 
 	FILE *f = fopen(filename, "r");
 	if(!f) {
-		if(action < 0 || errno != ENOENT) {
-			fprintf(stderr, "Could not open configuration file %s: %s\n", filename, strerror(errno));
-			return 1;
-		}
-
-		// If it doesn't exist, create it.
-		f = fopen(filename, "a+");
-		if(!f) {
-			fprintf(stderr, "Could not create configuration file %s: %s\n", filename, strerror(errno));
-			return 1;
-		} else {
-			fprintf(stderr, "Created configuration file %s.\n", filename);
-		}
+		fprintf(stderr, "Could not open configuration file %s: %s\n", filename, strerror(errno));
+		return 1;
 	}
 
 	char *tmpfile = NULL;
@@ -1216,6 +1554,7 @@ static int cmd_config(int argc, char *argv[]) {
 		tf = fopen(tmpfile, "w");
 		if(!tf) {
 			fprintf(stderr, "Could not open temporary file %s: %s\n", tmpfile, strerror(errno));
+			fclose(f);
 			return 1;
 		}
 	}
@@ -1259,9 +1598,14 @@ static int cmd_config(int argc, char *argv[]) {
 				}
 			// Set
 			} else if(action == 0) {
+				// Warn if "set" was used for variables that can occur multiple times
+				if(warnonremove && strcasecmp(bvalue, value))
+					fprintf(stderr, "Warning: removing %s = %s\n", variable, bvalue);
+
 				// Already set? Delete the rest...
 				if(set)
 					continue;
+
 				// Otherwise, replace.
 				if(fprintf(tf, "%s = %s\n", variable, value) < 0) {
 					fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
@@ -1269,6 +1613,11 @@ static int cmd_config(int argc, char *argv[]) {
 				}
 				set = true;
 				continue;
+			// Add
+			} else if(action > 0) {
+				// Check if we've already seen this variable with the same value
+				if(!strcasecmp(bvalue, value))
+					found = true;
 			}
 		}
 
@@ -1301,7 +1650,7 @@ static int cmd_config(int argc, char *argv[]) {
 	}
 
 	// Add new variable if necessary.
-	if(action > 0 || (action == 0 && !set)) {
+	if((action > 0 && !found)|| (action == 0 && !set)) {
 		if(fprintf(tf, "%s = %s\n", variable, value) < 0) {
 			fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
 			return 1;
@@ -1309,9 +1658,12 @@ static int cmd_config(int argc, char *argv[]) {
 	}
 
 	if(action < -1) {
-		if(!found)
+		if(found) {
+			return 0;
+		} else {
 			fprintf(stderr, "No matching configuration variables found.\n");
-		return 0;
+			return 1;
+		}
 	}
 
 	// Make sure we wrote everything...
@@ -1324,7 +1676,7 @@ static int cmd_config(int argc, char *argv[]) {
 	if(action < 0 && !removed) {
 		remove(tmpfile);
 		fprintf(stderr, "No configuration variables deleted.\n");
-		return *value;
+		return 1;
 	}
 
 	// Replace the configuration file with the new one
@@ -1340,37 +1692,83 @@ static int cmd_config(int argc, char *argv[]) {
 	}
 
 	// Silently try notifying a running tincd of changes.
-	fclose(stderr);
-
-	if(connect_tincd())
+	if(connect_tincd(false))
 		sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
 
 	return 0;
 }
 
-bool check_id(const char *name) {
-	if(!name || !*name)
+static bool try_bind(int port) {
+	struct addrinfo *ai = NULL;
+	struct addrinfo hint = {
+		.ai_flags = AI_PASSIVE,
+		.ai_family = AF_UNSPEC,
+		.ai_socktype = SOCK_STREAM,
+		.ai_protocol = IPPROTO_TCP,
+	};
+
+	char portstr[16];
+	snprintf(portstr, sizeof portstr, "%d", port);
+
+	if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai)
 		return false;
 
-	for(int i = 0; i < strlen(name); i++) {
-		if(!isalnum(name[i]) && name[i] != '_')
+	while(ai) {
+		int fd = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP);
+		if(!fd)
+			return false;
+		int result = bind(fd, ai->ai_addr, ai->ai_addrlen);
+		closesocket(fd);
+		if(result)
 			return false;
+		ai = ai->ai_next;
 	}
 
 	return true;
 }
 
+int check_port(char *name) {
+	if(try_bind(655))
+		return 655;
+
+	fprintf(stderr, "Warning: could not bind to port 655. ");
+
+	for(int i = 0; i < 100; i++) {
+		int port = 0x1000 + (rand() & 0x7fff);
+		if(try_bind(port)) {
+			char *filename;
+			xasprintf(&filename, "%s" SLASH "hosts" SLASH "%s", confbase, name);
+			FILE *f = fopen(filename, "a");
+			free(filename);
+			if(!f) {
+				fprintf(stderr, "Please change tinc's Port manually.\n");
+				return 0;
+			}
+
+			fprintf(f, "Port = %d\n", port);
+			fclose(f);
+			fprintf(stderr, "Tinc will instead listen on port %d.\n", port);
+			return port;
+		}
+	}
+
+	fprintf(stderr, "Please change tinc's Port manually.\n");
+	return 0;
+}
+
 static int cmd_init(int argc, char *argv[]) {
 	if(!access(tinc_conf, F_OK)) {
 		fprintf(stderr, "Configuration file %s already exists!\n", tinc_conf);
 		return 1;
 	}
 
-	if(argc < 2) {
-		if(isatty(0) && isatty(1)) {
+	if(argc > 2) {
+		fprintf(stderr, "Too many arguments!\n");
+		return 1;
+	} else if(argc < 2) {
+		if(tty) {
 			char buf[1024];
-			fprintf(stdout, "Enter the Name you want your tinc node to have: ");
-			fflush(stdout);
+			fprintf(stderr, "Enter the Name you want your tinc node to have: ");
 			if(!fgets(buf, sizeof buf, stdin)) {
 				fprintf(stderr, "Error while reading stdin: %s\n", strerror(errno));
 				return 1;
@@ -1398,17 +1796,17 @@ static int cmd_init(int argc, char *argv[]) {
 		return 1;
 	}
 
-	if(mkdir(confdir, 0755) && errno != EEXIST) {
-		fprintf(stderr, "Could not create directory %s: %s\n", CONFDIR, strerror(errno));
+	if(!confbase_given && mkdir(confdir, 0755) && errno != EEXIST) {
+		fprintf(stderr, "Could not create directory %s: %s\n", confdir, strerror(errno));
 		return 1;
 	}
 
-	if(mkdir(confbase, 0755) && errno != EEXIST) {
+	if(mkdir(confbase, 0777) && errno != EEXIST) {
 		fprintf(stderr, "Could not create directory %s: %s\n", confbase, strerror(errno));
 		return 1;
 	}
 
-	if(mkdir(hosts_dir, 0755) && errno != EEXIST) {
+	if(mkdir(hosts_dir, 0777) && errno != EEXIST) {
 		fprintf(stderr, "Could not create directory %s: %s\n", hosts_dir, strerror(errno));
 		return 1;
 	}
@@ -1422,21 +1820,26 @@ static int cmd_init(int argc, char *argv[]) {
 	fprintf(f, "Name = %s\n", name);
 	fclose(f);
 
-	fclose(stdin);
-	if(!rsa_keygen(2048) || !ecdsa_keygen())
+#ifndef DISABLE_LEGACY
+	if(!rsa_keygen(2048, false))
 		return 1;
+#endif
+
+	if(!ed25519_keygen(false))
+		return 1;
+
+	check_port(name);
 
 #ifndef HAVE_MINGW
 	char *filename;
 	xasprintf(&filename, "%s" SLASH "tinc-up", confbase);
 	if(access(filename, F_OK)) {
-		FILE *f = fopen(filename, "w");
+		FILE *f = fopenmask(filename, "w", 0777);
 		if(!f) {
 			fprintf(stderr, "Could not create file %s: %s\n", filename, strerror(errno));
 			return 1;
 		}
-		fchmod(fileno(f), 0755);
-		fprintf(f, "#!/bin/sh\n\necho 'Unconfigured tinc-up script, please edit!'\n\n#ifconfig $INTERFACE <your vpn IP address> netmask <netmask of whole VPN>\n");
+		fprintf(f, "#!/bin/sh\n\necho 'Unconfigured tinc-up script, please edit '$0'!'\n\n#ifconfig $INTERFACE <your vpn IP address> netmask <netmask of whole VPN>\n");
 		fclose(f);
 	}
 #endif
@@ -1446,15 +1849,53 @@ static int cmd_init(int argc, char *argv[]) {
 }
 
 static int cmd_generate_keys(int argc, char *argv[]) {
-	return !(rsa_keygen(argc > 1 ? atoi(argv[1]) : 2048) && ecdsa_keygen());
+#ifdef DISABLE_LEGACY
+	if(argc > 1) {
+#else
+	if(argc > 2) {
+#endif
+		fprintf(stderr, "Too many arguments!\n");
+		return 1;
+	}
+
+	if(!name)
+		name = get_my_name(false);
+
+#ifndef DISABLE_LEGACY
+	if(!rsa_keygen(argc > 1 ? atoi(argv[1]) : 2048, true))
+		return 1;
+#endif
+
+	if(!ed25519_keygen(true))
+		return 1;
+
+	return 0;
 }
 
+#ifndef DISABLE_LEGACY
 static int cmd_generate_rsa_keys(int argc, char *argv[]) {
-	return !rsa_keygen(argc > 1 ? atoi(argv[1]) : 2048);
+	if(argc > 2) {
+		fprintf(stderr, "Too many arguments!\n");
+		return 1;
+	}
+
+	if(!name)
+		name = get_my_name(false);
+
+	return !rsa_keygen(argc > 1 ? atoi(argv[1]) : 2048, true);
 }
+#endif
+
+static int cmd_generate_ed25519_keys(int argc, char *argv[]) {
+	if(argc > 1) {
+		fprintf(stderr, "Too many arguments!\n");
+		return 1;
+	}
+
+	if(!name)
+		name = get_my_name(false);
 
-static int cmd_generate_ecdsa_keys(int argc, char *argv[]) {
-	return !ecdsa_keygen();
+	return !ed25519_keygen(true);
 }
 
 static int cmd_help(int argc, char *argv[]) {
@@ -1463,6 +1904,11 @@ static int cmd_help(int argc, char *argv[]) {
 }
 
 static int cmd_version(int argc, char *argv[]) {
+	if(argc > 1) {
+		fprintf(stderr, "Too many arguments!\n");
+		return 1;
+	}
+
 	version();
 	return 0;
 }
@@ -1473,7 +1919,7 @@ static int cmd_info(int argc, char *argv[]) {
 		return 1;
 	}
 
-	if(!connect_tincd())
+	if(!connect_tincd(true))
 		return 1;
 
 	return info(fd, argv[1]);
@@ -1532,9 +1978,7 @@ static int cmd_edit(int argc, char *argv[]) {
 		return result;
 
 	// Silently try notifying a running tincd of changes.
-	fclose(stderr);
-
-	if(connect_tincd())
+	if(connect_tincd(false))
 		sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
 
 	return 0;
@@ -1558,6 +2002,7 @@ static int export(const char *name, FILE *out) {
 
 	if(ferror(in)) {
 		fprintf(stderr, "Error while reading configuration file %s: %s\n", filename, strerror(errno));
+		fclose(in);
 		return 1;
 	}
 
@@ -1566,14 +2011,29 @@ static int export(const char *name, FILE *out) {
 }
 
 static int cmd_export(int argc, char *argv[]) {
-	char *name = get_my_name();
+	if(argc > 1) {
+		fprintf(stderr, "Too many arguments!\n");
+		return 1;
+	}
+
+	char *name = get_my_name(true);
 	if(!name)
 		return 1;
 
-	return export(name, stdout);
+	int result = export(name, stdout);
+	if(!tty)
+		fclose(stdout);
+
+	free(name);
+	return result;
 }
 
 static int cmd_export_all(int argc, char *argv[]) {
+	if(argc > 1) {
+		fprintf(stderr, "Too many arguments!\n");
+		return 1;
+	}
+
 	DIR *dir = opendir(hosts_dir);
 	if(!dir) {
 		fprintf(stderr, "Could not open host configuration directory %s: %s\n", hosts_dir, strerror(errno));
@@ -1597,21 +2057,30 @@ static int cmd_export_all(int argc, char *argv[]) {
 	}
 
 	closedir(dir);
+	if(!tty)
+		fclose(stdout);
 	return result;
 }
 
 static int cmd_import(int argc, char *argv[]) {
+	if(argc > 1) {
+		fprintf(stderr, "Too many arguments!\n");
+		return 1;
+	}
+
 	FILE *in = stdin;
 	FILE *out = NULL;
 
 	char buf[4096];
 	char name[4096];
-	char *filename;
+	char *filename = NULL;
 	int count = 0;
 	bool firstline = true;
 
 	while(fgets(buf, sizeof buf, in)) {
 		if(sscanf(buf, "Name = %s", name) == 1) {
+			firstline = false;
+
 			if(!check_id(name)) {
 				fprintf(stderr, "Invalid Name in input!\n");
 				return 1;
@@ -1636,7 +2105,6 @@ static int cmd_import(int argc, char *argv[]) {
 			}
 
 			count++;
-			firstline = false;
 			continue;
 		} else if(firstline) {
 			fprintf(stderr, "Junk at the beginning of the input, ignoring.\n");
@@ -1667,9 +2135,92 @@ static int cmd_import(int argc, char *argv[]) {
 	}
 }
 
+static int cmd_exchange(int argc, char *argv[]) {
+	return cmd_export(argc, argv) ?: cmd_import(argc, argv);
+}
+
+static int cmd_exchange_all(int argc, char *argv[]) {
+	return cmd_export_all(argc, argv) ?: cmd_import(argc, argv);
+}
+
+static int switch_network(char *name) {
+	if(fd >= 0) {
+		close(fd);
+		fd = -1;
+	}
+
+	free(confbase);
+	confbase = NULL;
+	free(pidfilename);
+	pidfilename = NULL;
+	free(logfilename);
+	logfilename = NULL;
+	free(unixsocketname);
+	unixsocketname = NULL;
+	free(tinc_conf);
+	free(hosts_dir);
+	free(prompt);
+
+	free(netname);
+	netname = strcmp(name, ".") ? xstrdup(name) : NULL;
+
+        xasprintf(&tinc_conf, "%s" SLASH "tinc.conf", confbase);
+        xasprintf(&hosts_dir, "%s" SLASH "hosts", confbase);
+	xasprintf(&prompt, "%s> ", identname);
+
+	return 0;
+}
+
+static int cmd_network(int argc, char *argv[]) {
+	if(argc > 2) {
+		fprintf(stderr, "Too many arguments!\n");
+		return 1;
+	}
+
+	if(argc == 2)
+		return switch_network(argv[1]);
+
+	DIR *dir = opendir(confdir);
+	if(!dir) {
+		fprintf(stderr, "Could not read directory %s: %s\n", confdir, strerror(errno));
+                return 1;
+        }
+
+	struct dirent *ent;
+	while((ent = readdir(dir))) {
+		if(*ent->d_name == '.')
+			continue;
+
+		if(!strcmp(ent->d_name, "tinc.conf")) {
+			printf(".\n");
+			continue;
+		}
+
+		char *fname;
+		xasprintf(&fname, "%s/%s/tinc.conf", confdir, ent->d_name);
+		if(!access(fname, R_OK))
+			printf("%s\n", ent->d_name);
+		free(fname);
+	}
+
+	closedir(dir);
+
+	return 0;
+}
+
+static int cmd_fsck(int argc, char *argv[]) {
+	if(argc > 1) {
+		fprintf(stderr, "Too many arguments!\n");
+		return 1;
+	}
+
+	return fsck(orig_argv[0]);
+}
+
 static const struct {
 	const char *command;
 	int (*function)(int argc, char *argv[]);
+	bool hidden;
 } commands[] = {
 	{"start", cmd_start},
 	{"stop", cmd_stop},
@@ -1685,11 +2236,17 @@ static const struct {
 	{"pcap", cmd_pcap},
 	{"log", cmd_log},
 	{"pid", cmd_pid},
-	{"config", cmd_config},
+	{"config", cmd_config, true},
+	{"add", cmd_config},
+	{"del", cmd_config},
+	{"get", cmd_config},
+	{"set", cmd_config},
 	{"init", cmd_init},
 	{"generate-keys", cmd_generate_keys},
+#ifndef DISABLE_LEGACY
 	{"generate-rsa-keys", cmd_generate_rsa_keys},
-	{"generate-ecdsa-keys", cmd_generate_ecdsa_keys},
+#endif
+	{"generate-ed25519-keys", cmd_generate_ed25519_keys},
 	{"help", cmd_help},
 	{"version", cmd_version},
 	{"info", cmd_info},
@@ -1697,16 +2254,249 @@ static const struct {
 	{"export", cmd_export},
 	{"export-all", cmd_export_all},
 	{"import", cmd_import},
+	{"exchange", cmd_exchange},
+	{"exchange-all", cmd_exchange_all},
+	{"invite", cmd_invite},
+	{"join", cmd_join},
+	{"network", cmd_network},
+	{"fsck", cmd_fsck},
 	{NULL, NULL},
 };
 
+#ifdef HAVE_READLINE
+static char *complete_command(const char *text, int state) {
+	static int i;
+
+	if(!state)
+		i = 0;
+	else
+		i++;
+
+	while(commands[i].command) {
+		if(!commands[i].hidden && !strncasecmp(commands[i].command, text, strlen(text)))
+			return xstrdup(commands[i].command);
+		i++;
+	}
+
+	return NULL;
+}
+
+static char *complete_dump(const char *text, int state) {
+	const char *matches[] = {"reachable", "nodes", "edges", "subnets", "connections", "graph", NULL};
+	static int i;
+
+	if(!state)
+		i = 0;
+	else
+		i++;
+
+	while(matches[i]) {
+		if(!strncasecmp(matches[i], text, strlen(text)))
+			return xstrdup(matches[i]);
+		i++;
+	}
+
+	return NULL;
+}
+
+static char *complete_config(const char *text, int state) {
+	static int i;
+
+	if(!state)
+		i = 0;
+	else
+		i++;
+
+	while(variables[i].name) {
+		char *dot = strchr(text, '.');
+		if(dot) {
+			if((variables[i].type & VAR_HOST) && !strncasecmp(variables[i].name, dot + 1, strlen(dot + 1))) {
+				char *match;
+				xasprintf(&match, "%.*s.%s", (int)(dot - text), text, variables[i].name);
+				return match;
+			}
+		} else {
+			if(!strncasecmp(variables[i].name, text, strlen(text)))
+				return xstrdup(variables[i].name);
+		}
+		i++;
+	}
+
+	return NULL;
+}
+
+static char *complete_info(const char *text, int state) {
+	static int i;
+	if(!state) {
+		i = 0;
+		if(!connect_tincd(false))
+			return NULL;
+		// Check the list of nodes
+		sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
+		sendline(fd, "%d %d", CONTROL, REQ_DUMP_SUBNETS);
+	}
+
+	while(recvline(fd, line, sizeof line)) {
+		char item[4096];
+		int n = sscanf(line, "%d %d %s", &code, &req, item);
+		if(n == 2) {
+			i++;
+			if(i >= 2)
+				break;
+			else
+				continue;
+		}
+
+		if(n != 3) {
+			fprintf(stderr, "Unable to parse dump from tincd, n = %d, i = %d.\n", n, i);
+			break;
+		}
+
+		if(!strncmp(item, text, strlen(text)))
+			return xstrdup(strip_weight(item));
+	}
+
+	return NULL;
+}
+
+static char *complete_nothing(const char *text, int state) {
+	return NULL;
+}
+
+static char **completion (const char *text, int start, int end) {
+	char **matches = NULL;
+
+	if(!start)
+		matches = rl_completion_matches(text, complete_command);
+	else if(!strncasecmp(rl_line_buffer, "dump ", 5))
+		matches = rl_completion_matches(text, complete_dump);
+	else if(!strncasecmp(rl_line_buffer, "add ", 4))
+		matches = rl_completion_matches(text, complete_config);
+	else if(!strncasecmp(rl_line_buffer, "del ", 4))
+		matches = rl_completion_matches(text, complete_config);
+	else if(!strncasecmp(rl_line_buffer, "get ", 4))
+		matches = rl_completion_matches(text, complete_config);
+	else if(!strncasecmp(rl_line_buffer, "set ", 4))
+		matches = rl_completion_matches(text, complete_config);
+	else if(!strncasecmp(rl_line_buffer, "info ", 5))
+		matches = rl_completion_matches(text, complete_info);
+
+	return matches;
+}
+#endif
+
+static int cmd_shell(int argc, char *argv[]) {
+	xasprintf(&prompt, "%s> ", identname);
+	int result = 0;
+	char buf[4096];
+	char *line = NULL;
+	int maxargs = argc + 16;
+	char **nargv = xmalloc(maxargs * sizeof *nargv);
+
+	for(int i = 0; i < argc; i++)
+		nargv[i] = argv[i];
+
+#ifdef HAVE_READLINE
+	rl_readline_name = "tinc";
+	rl_completion_entry_function = complete_nothing;
+	rl_attempted_completion_function = completion;
+	rl_filename_completion_desired = 0;
+	char *copy = NULL;
+#endif
+
+	while(true) {
+#ifdef HAVE_READLINE
+		if(tty) {
+			free(copy);
+			free(line);
+			rl_basic_word_break_characters = "\t\n ";
+			line = readline(prompt);
+			if(line)
+				copy = xstrdup(line);
+		} else {
+			line = fgets(buf, sizeof buf, stdin);
+		}
+#else
+		if(tty)
+			fputs(prompt, stdout);
+
+		line = fgets(buf, sizeof buf, stdin);
+#endif
+
+		if(!line)
+			break;
+
+		/* Ignore comments */
+
+		if(*line == '#')
+			continue;
+
+		/* Split */
+
+		int nargc = argc;
+		char *p = line + strspn(line, " \t\n");
+		char *next = strtok(p, " \t\n");
+
+		while(p && *p) {
+			if(nargc >= maxargs) {
+				fprintf(stderr, "next %p '%s', p %p '%s'\n", next, next, p, p);
+				abort();
+				maxargs *= 2;
+				nargv = xrealloc(nargv, maxargs * sizeof *nargv);
+			}
+
+			nargv[nargc++] = p;
+			p = next;
+			next = strtok(NULL, " \t\n");
+		}
+
+		if(nargc == argc)
+			continue;
+
+		if(!strcasecmp(nargv[argc], "exit") || !strcasecmp(nargv[argc], "quit"))
+			return result;
+
+		bool found = false;
+
+		for(int i = 0; commands[i].command; i++) {
+			if(!strcasecmp(nargv[argc], commands[i].command)) {
+				result |= commands[i].function(nargc - argc - 1, nargv + argc + 1);
+				found = true;
+				break;
+			}
+		}
+
+#ifdef HAVE_READLINE
+		if(tty && found)
+			add_history(copy);
+#endif
+
+		if(!found) {
+			fprintf(stderr, "Unknown command `%s'.\n", nargv[argc]);
+			result |= 1;
+		}
+	}
+
+	free(nargv);
+
+	if(tty)
+		printf("\n");
+	return result;
+}
+
+
 int main(int argc, char *argv[]) {
 	program_name = argv[0];
+	orig_argv = argv;
+	orig_argc = argc;
+	tty = isatty(0) && isatty(1);
 
 	if(!parse_options(argc, argv))
 		return 1;
-	
+
 	make_names();
+	xasprintf(&tinc_conf, "%s" SLASH "tinc.conf", confbase);
+	xasprintf(&hosts_dir, "%s" SLASH "hosts", confbase);
 
 	if(show_version) {
 		version();
@@ -1718,11 +2508,20 @@ int main(int argc, char *argv[]) {
 		return 0;
 	}
 
-	if(optind >= argc) {
-		fprintf(stderr, "No command given.\n");
-		usage(true);
-		return 1;
+#ifdef HAVE_MINGW
+	static struct WSAData wsa_state;
+
+	if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
+		fprintf(stderr, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
+		return false;
 	}
+#endif
+
+	srand(time(NULL));
+	crypto_init();
+
+	if(optind >= argc)
+		return cmd_shell(argc, argv);
 
 	for(int i = 0; commands[i].command; i++) {
 		if(!strcasecmp(argv[optind], commands[i].command))