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/*
net_setup.c -- Setup.
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
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
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.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "system.h"
#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"
#include "connection.h"
#include "device.h"
#include "event.h"
#include "graph.h"
#include "logger.h"
#include "net.h"
#include "netutl.h"
#include "process.h"
#include "protocol.h"
#include "route.h"
#include "subnet.h"
#include "utils.h"
#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) {
FILE *fp;
char *fname;
char *key;
if(!c->rsa_key) {
c->rsa_key = RSA_new();
// RSA_blinding_on(c->rsa_key, NULL);
}
/* First, check for simple PublicKey statement */
if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &key)) {
if(BN_hex2bn(&c->rsa_key->n, key) != strlen(key)) {
logger(LOG_ERR, "Invalid PublicKey for %s!", c->name);
return false;
}
BN_hex2bn(&c->rsa_key->e, "FFFF");
free(key);
return true;
}
/* Else, check for PublicKeyFile statement and read it */
if(get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname)) {
fp = fopen(fname, "r");
if(!fp) {
logger(LOG_ERR, "Error reading RSA public key file `%s': %s",
fname, strerror(errno));
free(fname);
return false;
}
free(fname);
c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
fclose(fp);
if(c->rsa_key)
return true; /* Woohoo. */
/* If it fails, try PEM_read_RSA_PUBKEY. */
fp = fopen(fname, "r");
if(!fp) {
logger(LOG_ERR, "Error reading RSA public key file `%s': %s",
fname, strerror(errno));
free(fname);
return false;
}
free(fname);
c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
fclose(fp);
if(c->rsa_key) {
// RSA_blinding_on(c->rsa_key, NULL);
return true;
}
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 */
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;
}
c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
fclose(fp);
free(fname);
if(c->rsa_key)
return true;
/* Try again with PEM_read_RSA_PUBKEY. */
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;
}
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);
return false;
}
static bool read_rsa_private_key(void) {
FILE *fp;
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);
if(BN_hex2bn(&myself->connection->rsa_key->d, key) != strlen(key)) {
logger(LOG_ERR, "Invalid PrivateKey for myself!");
return false;
}
if(BN_hex2bn(&myself->connection->rsa_key->n, pubkey) != strlen(pubkey)) {
logger(LOG_ERR, "Invalid PublicKey for myself!");
return false;
}
BN_hex2bn(&myself->connection->rsa_key->e, "FFFF");
free(key);
free(pubkey);
return true;
}
if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
xasprintf(&fname, "%s/rsa_key.priv", confbase);
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 !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);
return false;
}
if(s.st_mode & ~0100700)
logger(LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
#endif
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 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)
*/
static bool setup_myself(void) {
config_t *cfg;
subnet_t *subnet;
char *name, *hostname, *mode, *afname, *cipher, *digest, *type;
char *fname = NULL;
char *address = NULL;
char *proxy = NULL;
char *space;
char *envp[5];
struct addrinfo *ai, *aip, hint = {0};
bool choice;
int i, err;
int replaywin_int;
myself = new_node();
myself->connection = new_connection();
myself->hostname = xstrdup("MYSELF");
myself->connection->hostname = xstrdup("MYSELF");
myself->connection->options = 0;
myself->connection->protocol_version = PROT_CURRENT;
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(!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);
}
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;
}
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(config_tree, "Subnet");
while(cfg) {
if(!get_config_subnet(cfg, &subnet))
return false;
subnet_add(myself, subnet);
cfg = lookup_config_next(config_tree, cfg);
}
/* Check some options */
if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
myself->options |= OPTION_INDIRECT;
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;
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;
}
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;
}
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, "%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(config_tree, "MaxTimeout"), &maxtimeout)) {
if(maxtimeout <= 0) {
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;
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);
}
get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
/* Generate packet encryption key */
if(get_config_string
(lookup_config(config_tree, "Cipher"), &cipher)) {
if(!strcasecmp(cipher, "none")) {
myself->incipher = NULL;
} else {
myself->incipher = EVP_get_cipherbyname(cipher);
if(!myself->incipher) {
logger(LOG_ERR, "Unrecognized cipher type!");
return false;
}
}
} else
myself->incipher = EVP_bf_cbc();
if(myself->incipher)
myself->inkeylength = myself->incipher->key_len + myself->incipher->iv_len;
else
myself->inkeylength = 1;
myself->connection->outcipher = EVP_bf_ofb();
if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
keylifetime = 3600;
keyexpires = now + keylifetime;
/* Check if we want to use message authentication codes... */
if(get_config_string(lookup_config(config_tree, "Digest"), &digest)) {
if(!strcasecmp(digest, "none")) {
myself->indigest = NULL;
} else {
myself->indigest = EVP_get_digestbyname(digest);
if(!myself->indigest) {
logger(LOG_ERR, "Unrecognized digest type!");
return false;
}
}
} else
myself->indigest = EVP_sha1();
myself->connection->outdigest = EVP_sha1();
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->inmaclength < 0) {
logger(LOG_ERR, "Bogus MAC length!");
return false;
}
}
} else
myself->inmaclength = 4;
myself->connection->outmaclength = 0;
/* Compression */
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->incompression = 0;
myself->connection->outcompression = 0;
/* Done */
myself->nexthop = myself;
myself->via = myself;
myself->status.reachable = true;
node_add(myself);
graph();
if(strictsubnets)
load_all_subnets();
/* Open device */
devops = os_devops;
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(!devops.setup())
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;
execute_script("tinc-up", envp);
for(i = 0; i < 5; i++)
free(envp[i]);
/* Run subnet-up scripts for our own subnets */
subnet_update(myself, NULL, true);
/* Open sockets */
if(!do_detach && getenv("LISTEN_FDS")) {
sockaddr_t sa;
socklen_t salen;
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;
}
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
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");
else {
logger(LOG_ERR, "Unable to create any listening socket!");
return false;
}
return true;
}
/*
initialize network
*/
bool setup_network(void) {
now = time(NULL);
init_events();
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())
return false;
return true;
}
/*
close all open network connections
*/
void close_network_connections(void) {
avl_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 = NULL;
terminate_connection(c, false);
}
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_edges();
exit_subnets();
exit_nodes();
exit_connections();
exit_events();
execute_script("tinc-down", envp);
if(myport) free(myport);
for(i = 0; i < 4; i++)
free(envp[i]);
devops.close();
return;
}
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