tinc/src/net_setup.c
2022-04-23 10:57:20 +02:00

1324 lines
30 KiB
C

/*
net_setup.c -- Setup.
Copyright (C) 1998-2005 Ivo Timmermans,
2000-2021 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 "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 "names.h"
#include "net.h"
#include "netutl.h"
#include "process.h"
#include "protocol.h"
#include "route.h"
#include "rsa.h"
#include "script.h"
#include "subnet.h"
#include "utils.h"
#include "xalloc.h"
#ifdef HAVE_MINIUPNPC
#include "upnp.h"
#endif
char *myport;
static io_t device_io;
devops_t devops;
bool device_standby = false;
char *proxyhost;
char *proxyport;
char *proxyuser;
char *proxypass;
proxytype_t proxytype;
bool autoconnect;
bool disablebuggypeers;
char *scriptinterpreter;
char *scriptextension;
bool node_read_ecdsa_public_key(node_t *n) {
if(ecdsa_active(n->ecdsa)) {
return true;
}
splay_tree_t *config_tree;
FILE *fp;
char *pubname = NULL;
char *p;
init_configuration(&config_tree);
if(!read_host_config(config_tree, n->name, true)) {
goto exit;
}
/* First, check for simple Ed25519PublicKey statement */
if(get_config_string(lookup_config(config_tree, "Ed25519PublicKey"), &p)) {
n->ecdsa = ecdsa_set_base64_public_key(p);
free(p);
goto exit;
}
/* Else, check for Ed25519PublicKeyFile statement and read it */
if(!get_config_string(lookup_config(config_tree, "Ed25519PublicKeyFile"), &pubname)) {
xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
}
fp = fopen(pubname, "r");
if(!fp) {
goto exit;
}
n->ecdsa = ecdsa_read_pem_public_key(fp);
fclose(fp);
exit:
exit_configuration(&config_tree);
free(pubname);
return n->ecdsa;
}
bool read_ecdsa_public_key(connection_t *c) {
if(ecdsa_active(c->ecdsa)) {
return true;
}
FILE *fp;
char *fname;
char *p;
if(!c->config_tree) {
init_configuration(&c->config_tree);
if(!read_host_config(c->config_tree, c->name, true)) {
return false;
}
}
/* First, check for simple Ed25519PublicKey statement */
if(get_config_string(lookup_config(c->config_tree, "Ed25519PublicKey"), &p)) {
c->ecdsa = ecdsa_set_base64_public_key(p);
free(p);
return c->ecdsa;
}
/* Else, check for Ed25519PublicKeyFile statement and read it */
if(!get_config_string(lookup_config(c->config_tree, "Ed25519PublicKeyFile"), &fname)) {
xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
}
fp = fopen(fname, "r");
if(!fp) {
logger(DEBUG_ALWAYS, LOG_ERR, "Error reading Ed25519 public key file `%s': %s",
fname, strerror(errno));
free(fname);
return false;
}
c->ecdsa = ecdsa_read_pem_public_key(fp);
if(!c->ecdsa && errno != ENOENT) {
logger(DEBUG_ALWAYS, LOG_ERR, "Parsing Ed25519 public key file `%s' failed.", fname);
}
fclose(fp);
free(fname);
return c->ecdsa;
}
#ifndef DISABLE_LEGACY
bool read_rsa_public_key(connection_t *c) {
FILE *fp;
char *fname;
char *n;
/* First, check for simple PublicKey statement */
if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
c->rsa = rsa_set_hex_public_key(n, "FFFF");
free(n);
return c->rsa;
}
/* Else, check for PublicKeyFile statement and read it */
if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname)) {
xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
}
fp = fopen(fname, "r");
if(!fp) {
logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
free(fname);
return false;
}
c->rsa = rsa_read_pem_public_key(fp);
fclose(fp);
if(!c->rsa) {
logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA public key file `%s' failed: %s", fname, strerror(errno));
}
free(fname);
return c->rsa;
}
#endif
static bool read_ecdsa_private_key(void) {
FILE *fp;
char *fname;
/* Check for PrivateKeyFile statement and read it */
if(!get_config_string(lookup_config(config_tree, "Ed25519PrivateKeyFile"), &fname)) {
xasprintf(&fname, "%s" SLASH "ed25519_key.priv", confbase);
}
fp = fopen(fname, "r");
if(!fp) {
logger(DEBUG_ALWAYS, LOG_ERR, "Error reading Ed25519 private key file `%s': %s", fname, strerror(errno));
if(errno == ENOENT) {
logger(DEBUG_ALWAYS, LOG_INFO, "Create an Ed25519 key pair with `tinc -n %s generate-ed25519-keys'.", netname ? netname : ".");
}
free(fname);
return false;
}
#ifndef HAVE_MINGW
struct stat s;
if(fstat(fileno(fp), &s)) {
logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat Ed25519 private key file `%s': %s'", fname, strerror(errno));
free(fname);
return false;
}
if(s.st_mode & ~0100700) {
logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for Ed25519 private key file `%s'!", fname);
}
#endif
myself->connection->ecdsa = ecdsa_read_pem_private_key(fp);
fclose(fp);
if(!myself->connection->ecdsa) {
logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
}
free(fname);
return myself->connection->ecdsa;
}
static bool read_invitation_key(void) {
FILE *fp;
char fname[PATH_MAX];
if(invitation_key) {
ecdsa_free(invitation_key);
invitation_key = NULL;
}
snprintf(fname, sizeof(fname), "%s" SLASH "invitations" SLASH "ed25519_key.priv", confbase);
fp = fopen(fname, "r");
if(fp) {
invitation_key = ecdsa_read_pem_private_key(fp);
fclose(fp);
if(!invitation_key) {
logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
}
}
return invitation_key;
}
#ifndef DISABLE_LEGACY
static bool read_rsa_private_key(void) {
FILE *fp;
char *fname;
char *n, *d;
/* First, check for simple PrivateKey statement */
if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
if(!get_config_string(lookup_config(config_tree, "PublicKey"), &n)) {
logger(DEBUG_ALWAYS, LOG_ERR, "PrivateKey used but no PublicKey found!");
free(d);
return false;
}
myself->connection->rsa = rsa_set_hex_private_key(n, "FFFF", d);
free(n);
free(d);
return myself->connection->rsa;
}
/* Else, check for PrivateKeyFile statement and read it */
if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname)) {
xasprintf(&fname, "%s" SLASH "rsa_key.priv", confbase);
}
fp = fopen(fname, "r");
if(!fp) {
logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA private key file `%s': %s",
fname, strerror(errno));
if(errno == ENOENT) {
logger(DEBUG_ALWAYS, LOG_INFO, "Create an RSA key pair with `tinc -n %s generate-rsa-keys'.", netname ? netname : ".");
}
free(fname);
return false;
}
#ifndef HAVE_MINGW
struct stat s;
if(fstat(fileno(fp), &s)) {
logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
free(fname);
return false;
}
if(s.st_mode & ~0100700) {
logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
}
#endif
myself->connection->rsa = rsa_read_pem_private_key(fp);
fclose(fp);
if(!myself->connection->rsa) {
logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
}
free(fname);
return myself->connection->rsa;
}
#endif
#ifndef DISABLE_LEGACY
static timeout_t keyexpire_timeout;
static void keyexpire_handler(void *data) {
regenerate_key();
timeout_set(data, &(struct timeval) {
keylifetime, rand() % 100000
});
}
#endif
void regenerate_key(void) {
logger(DEBUG_STATUS, LOG_INFO, "Expiring symmetric keys");
send_key_changed();
for splay_each(node_t, n, node_tree) {
n->status.validkey_in = false;
}
}
void load_all_nodes(void) {
DIR *dir;
struct dirent *ent;
char dname[PATH_MAX];
snprintf(dname, sizeof(dname), "%s" SLASH "hosts", confbase);
dir = opendir(dname);
if(!dir) {
logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
return;
}
while((ent = readdir(dir))) {
if(!check_id(ent->d_name)) {
continue;
}
node_t *n = lookup_node(ent->d_name);
splay_tree_t *config_tree;
init_configuration(&config_tree);
read_config_options(config_tree, ent->d_name);
read_host_config(config_tree, ent->d_name, true);
if(!n) {
n = new_node();
n->name = xstrdup(ent->d_name);
node_add(n);
}
if(strictsubnets) {
for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
subnet_t *s, *s2;
if(!get_config_subnet(cfg, &s)) {
continue;
}
if((s2 = lookup_subnet(n, s))) {
s2->expires = -1;
free(s);
} else {
subnet_add(n, s);
}
}
}
if(lookup_config(config_tree, "Address")) {
n->status.has_address = true;
}
exit_configuration(&config_tree);
}
closedir(dir);
}
char *get_name(void) {
char *name = NULL;
char *returned_name;
get_config_string(lookup_config(config_tree, "Name"), &name);
if(!name) {
return NULL;
}
returned_name = replace_name(name);
free(name);
return returned_name;
}
bool setup_myself_reloadable(void) {
char *proxy = NULL;
char *rmode = NULL;
char *fmode = NULL;
char *bmode = NULL;
char *afname = NULL;
char *space;
bool choice;
free(scriptinterpreter);
scriptinterpreter = NULL;
get_config_string(lookup_config(config_tree, "ScriptsInterpreter"), &scriptinterpreter);
free(scriptextension);
if(!get_config_string(lookup_config(config_tree, "ScriptsExtension"), &scriptextension)) {
scriptextension = xstrdup("");
}
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(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
return false;
}
switch(proxytype) {
case PROXY_NONE:
default:
break;
case PROXY_EXEC:
if(!space || !*space) {
logger(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, 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);
}
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, "UDPDiscovery"), &udp_discovery);
get_config_int(lookup_config(config_tree, "UDPDiscoveryKeepaliveInterval"), &udp_discovery_keepalive_interval);
get_config_int(lookup_config(config_tree, "UDPDiscoveryInterval"), &udp_discovery_interval);
get_config_int(lookup_config(config_tree, "UDPDiscoveryTimeout"), &udp_discovery_timeout);
get_config_int(lookup_config(config_tree, "MTUInfoInterval"), &mtu_info_interval);
get_config_int(lookup_config(config_tree, "UDPInfoInterval"), &udp_info_interval);
get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
if(!strcasecmp(rmode, "router")) {
routing_mode = RMODE_ROUTER;
} else if(!strcasecmp(rmode, "switch")) {
routing_mode = RMODE_SWITCH;
} else if(!strcasecmp(rmode, "hub")) {
routing_mode = RMODE_HUB;
} else {
logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
return false;
}
free(rmode);
}
if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
if(!strcasecmp(fmode, "off")) {
forwarding_mode = FMODE_OFF;
} else if(!strcasecmp(fmode, "internal")) {
forwarding_mode = FMODE_INTERNAL;
} else if(!strcasecmp(fmode, "kernel")) {
forwarding_mode = FMODE_KERNEL;
} else {
logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
return false;
}
free(fmode);
}
choice = !(myself->options & OPTION_TCPONLY);
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"), &bmode)) {
if(!strcasecmp(bmode, "no")) {
broadcast_mode = BMODE_NONE;
} else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst")) {
broadcast_mode = BMODE_MST;
} else if(!strcasecmp(bmode, "direct")) {
broadcast_mode = BMODE_DIRECT;
} else {
logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
return false;
}
free(bmode);
}
const char *const DEFAULT_BROADCAST_SUBNETS[] = { "ff:ff:ff:ff:ff:ff", "255.255.255.255", "224.0.0.0/4", "ff00::/8" };
for(size_t i = 0; i < sizeof(DEFAULT_BROADCAST_SUBNETS) / sizeof(*DEFAULT_BROADCAST_SUBNETS); i++) {
subnet_t *s = new_subnet();
if(!str2net(s, DEFAULT_BROADCAST_SUBNETS[i])) {
abort();
}
subnet_add(NULL, s);
}
for(config_t *cfg = lookup_config(config_tree, "BroadcastSubnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
subnet_t *s;
if(!get_config_subnet(cfg, &s)) {
continue;
}
subnet_add(NULL, s);
}
#if !defined(IP_TOS)
if(priorityinheritance) {
logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform for IPv4 connections", "PriorityInheritance");
}
#endif
#if !defined(IPV6_TCLASS)
if(priorityinheritance) {
logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform for IPv6 connections", "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(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
return false;
}
free(afname);
}
get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime)) {
keylifetime = 3600;
}
if(!get_config_bool(lookup_config(config_tree, "AutoConnect"), &autoconnect)) {
autoconnect = true;
}
get_config_bool(lookup_config(config_tree, "DisableBuggyPeers"), &disablebuggypeers);
if(!get_config_int(lookup_config(config_tree, "InvitationExpire"), &invitation_lifetime)) {
invitation_lifetime = 604800; // 1 week
}
read_invitation_key();
return true;
}
/*
Add listening sockets.
*/
static bool add_listen_address(char *address, bool bindto) {
char *port = myport;
if(address) {
char *space = strchr(address, ' ');
if(space) {
*space++ = 0;
port = space;
}
if(!strcmp(address, "*")) {
*address = 0;
}
}
struct addrinfo *ai, hint = {0};
hint.ai_family = addressfamily;
hint.ai_socktype = SOCK_STREAM;
hint.ai_protocol = IPPROTO_TCP;
hint.ai_flags = AI_PASSIVE;
#if HAVE_DECL_RES_INIT
res_init();
#endif
int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
free(address);
if(err || !ai) {
logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
return false;
}
for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
// Ignore duplicate addresses
bool found = false;
for(int i = 0; i < listen_sockets; i++)
if(!memcmp(&listen_socket[i].sa, aip->ai_addr, aip->ai_addrlen)) {
found = true;
break;
}
if(found) {
continue;
}
if(listen_sockets >= MAXSOCKETS) {
logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
return false;
}
int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
if(tcp_fd < 0) {
continue;
}
int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
if(udp_fd < 0) {
close(tcp_fd);
continue;
}
io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
if(debug_level >= DEBUG_CONNECTIONS) {
char *hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
free(hostname);
}
listen_socket[listen_sockets].bindto = bindto;
memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
listen_sockets++;
}
freeaddrinfo(ai);
return true;
}
void device_enable(void) {
if(devops.enable) {
devops.enable();
}
/* Run tinc-up script to further initialize the tap interface */
environment_t env;
environment_init(&env);
execute_script("tinc-up", &env);
environment_exit(&env);
}
void device_disable(void) {
environment_t env;
environment_init(&env);
execute_script("tinc-down", &env);
environment_exit(&env);
if(devops.disable) {
devops.disable();
}
}
/*
Configure node_t myself and set up the local sockets (listen only)
*/
static bool setup_myself(void) {
char *name, *hostname, *type;
char *address = NULL;
bool port_specified = false;
if(!(name = get_name())) {
logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
return false;
}
myname = xstrdup(name);
myself = new_node();
myself->connection = new_connection();
myself->name = name;
myself->connection->name = xstrdup(name);
read_host_config(config_tree, name, true);
if(!get_config_string(lookup_config(config_tree, "Port"), &myport)) {
myport = xstrdup("655");
} else {
port_specified = true;
}
myself->connection->options = 0;
myself->connection->protocol_major = PROT_MAJOR;
myself->connection->protocol_minor = PROT_MINOR;
myself->options |= PROT_MINOR << 24;
#ifdef DISABLE_LEGACY
experimental = read_ecdsa_private_key();
if(!experimental) {
logger(DEBUG_ALWAYS, LOG_ERR, "No private key available, cannot start tinc!");
return false;
}
#else
if(!get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental)) {
experimental = read_ecdsa_private_key();
if(!experimental) {
logger(DEBUG_ALWAYS, LOG_WARNING, "Support for SPTPS disabled.");
}
} else {
if(experimental && !read_ecdsa_private_key()) {
return false;
}
}
if(!read_rsa_private_key()) {
if(experimental) {
logger(DEBUG_ALWAYS, LOG_WARNING, "Support for legacy protocol disabled.");
} else {
logger(DEBUG_ALWAYS, LOG_ERR, "No private keys available, cannot start tinc!");
return false;
}
}
#endif
/* Ensure myport is numeric */
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);
freeaddrinfo(ai);
sockaddr2str(&sa, NULL, &myport);
}
/* Read in all the subnets specified in the host configuration file */
for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
subnet_t *subnet;
if(!get_config_subnet(cfg, &subnet)) {
return false;
}
subnet_add(myself, subnet);
}
/* Check some options */
if(!setup_myself_reloadable()) {
return false;
}
get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
strictsubnets |= tunnelserver;
if(get_config_int(lookup_config(config_tree, "MaxConnectionBurst"), &max_connection_burst)) {
if(max_connection_burst <= 0) {
logger(DEBUG_ALWAYS, LOG_ERR, "MaxConnectionBurst cannot be negative!");
return false;
}
}
if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
if(udp_rcvbuf < 0) {
logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
return false;
}
}
if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
if(udp_sndbuf < 0) {
logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
return false;
}
}
get_config_int(lookup_config(config_tree, "FWMark"), &fwmark);
#ifndef SO_MARK
if(fwmark) {
logger(DEBUG_ALWAYS, LOG_ERR, "FWMark not supported on this platform!");
return false;
}
#endif
int replaywin_int;
if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
if(replaywin_int < 0) {
logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
return false;
}
replaywin = (unsigned)replaywin_int;
sptps_replaywin = replaywin;
}
#ifndef DISABLE_LEGACY
/* Generate packet encryption key */
char *cipher;
if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher)) {
cipher = xstrdup("aes-256-cbc");
}
if(!strcasecmp(cipher, "none")) {
myself->incipher = NULL;
} else if(!(myself->incipher = cipher_open_by_name(cipher))) {
logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
free(cipher);
return false;
}
free(cipher);
timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval) {
keylifetime, rand() % 100000
});
/* Check if we want to use message authentication codes... */
int maclength = 4;
get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
if(maclength < 0) {
logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
return false;
}
char *digest;
if(!get_config_string(lookup_config(config_tree, "Digest"), &digest)) {
digest = xstrdup("sha256");
}
if(!strcasecmp(digest, "none")) {
myself->indigest = NULL;
} else if(!(myself->indigest = digest_open_by_name(digest, maclength))) {
logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
free(digest);
return false;
}
free(digest);
#endif
/* Compression */
if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
if(myself->incompression < 0 || myself->incompression > 11) {
logger(DEBUG_ALWAYS, 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;
myself->last_state_change = now.tv_sec;
myself->status.sptps = experimental;
node_add(myself);
graph();
load_all_nodes();
/* 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 HAVE_SYS_UN_H
else if(!strcasecmp(type, "fd")) {
devops = fd_devops;
}
#endif
#ifdef ENABLE_UML
else if(!strcasecmp(type, "uml")) {
devops = uml_devops;
}
#endif
#ifdef ENABLE_VDE
else if(!strcasecmp(type, "vde")) {
devops = vde_devops;
}
#endif
free(type);
}
get_config_bool(lookup_config(config_tree, "DeviceStandby"), &device_standby);
if(!devops.setup()) {
return false;
}
if(device_fd >= 0) {
io_add(&device_io, handle_device_data, NULL, device_fd, IO_READ);
}
/* 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(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
return false;
}
for(int i = 0; i < listen_sockets; i++) {
salen = sizeof(sa);
if(getsockname(i + 3, &sa.sa, &salen) < 0) {
logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(sockerrno));
return false;
}
#ifdef FD_CLOEXEC
fcntl(i + 3, F_SETFD, FD_CLOEXEC);
#endif
int udp_fd = setup_vpn_in_socket(&sa);
if(udp_fd < 0) {
return false;
}
io_add(&listen_socket[i].tcp, (io_cb_t)handle_new_meta_connection, &listen_socket[i], i + 3, IO_READ);
io_add(&listen_socket[i].udp, (io_cb_t)handle_incoming_vpn_data, &listen_socket[i], udp_fd, IO_READ);
if(debug_level >= DEBUG_CONNECTIONS) {
hostname = sockaddr2hostname(&sa);
logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
free(hostname);
}
memcpy(&listen_socket[i].sa, &sa, salen);
}
} else {
listen_sockets = 0;
int cfgs = 0;
for(config_t *cfg = lookup_config(config_tree, "BindToAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
cfgs++;
get_config_string(cfg, &address);
if(!add_listen_address(address, true)) {
return false;
}
}
for(config_t *cfg = lookup_config(config_tree, "ListenAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
cfgs++;
get_config_string(cfg, &address);
if(!add_listen_address(address, false)) {
return false;
}
}
if(!cfgs)
if(!add_listen_address(address, NULL)) {
return false;
}
}
if(!listen_sockets) {
logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
return false;
}
/* If no Port option was specified, set myport to the port used by the first listening socket. */
if(!port_specified || atoi(myport) == 0) {
sockaddr_t sa;
socklen_t salen = sizeof(sa);
if(!getsockname(listen_socket[0].udp.fd, &sa.sa, &salen)) {
free(myport);
sockaddr2str(&sa, NULL, &myport);
if(!myport) {
myport = xstrdup("655");
}
}
}
xasprintf(&myself->hostname, "MYSELF port %s", myport);
myself->connection->hostname = xstrdup(myself->hostname);
char *upnp = NULL;
get_config_string(lookup_config(config_tree, "UPnP"), &upnp);
bool upnp_tcp = false;
bool upnp_udp = false;
if(upnp) {
if(!strcasecmp(upnp, "yes")) {
upnp_tcp = upnp_udp = true;
} else if(!strcasecmp(upnp, "udponly")) {
upnp_udp = true;
}
free(upnp);
}
if(upnp_tcp || upnp_udp) {
#ifdef HAVE_MINIUPNPC
upnp_init(upnp_tcp, upnp_udp);
#else
logger(DEBUG_ALWAYS, LOG_WARNING, "UPnP was requested, but tinc isn't built with miniupnpc support!");
#endif
}
/* Done. */
last_config_check = 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()) {
return false;
}
if(!init_control()) {
return false;
}
if(!device_standby) {
device_enable();
}
/* Run subnet-up scripts for our own subnets */
subnet_update(myself, NULL, true);
return true;
}
/*
close all open network connections
*/
void close_network_connections(void) {
for(list_node_t *node = connection_list->head, *next; node; node = next) {
next = node->next;
connection_t *c = node->data;
/* Keep control connections open until the end, so they know when we really terminated */
if(c->status.control) {
c->socket = -1;
}
c->outgoing = NULL;
terminate_connection(c, false);
}
if(outgoing_list) {
list_delete_list(outgoing_list);
}
if(myself && myself->connection) {
subnet_update(myself, NULL, false);
connection_del(myself->connection);
}
for(int i = 0; i < listen_sockets; i++) {
io_del(&listen_socket[i].tcp);
io_del(&listen_socket[i].udp);
close(listen_socket[i].tcp.fd);
close(listen_socket[i].udp.fd);
}
exit_requests();
exit_edges();
exit_subnets();
exit_nodes();
exit_connections();
if(!device_standby) {
device_disable();
}
free(myport);
if(device_fd >= 0) {
io_del(&device_io);
}
if(devops.close) {
devops.close();
}
exit_control();
free(scriptextension);
free(scriptinterpreter);
return;
}