/*
net_socket.c -- Handle various kinds of sockets.
- Copyright (C) 1998-2005 Ivo Timmermans,
- 2000-2013 Guus Sliepen <guus@tinc-vpn.org>
- 2006 Scott Lamb <slamb@slamb.org>
- 2009 Florian Forster <octo@verplant.org>
+ Copyright (C) 2014 Guus Sliepen <guus@meshlink.io>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
#include "conf.h"
#include "connection.h"
-#include "control_common.h"
#include "list.h"
#include "logger.h"
#include "meta.h"
-#include "names.h"
#include "net.h"
#include "netutl.h"
#include "protocol.h"
int addressfamily = AF_UNSPEC;
int maxtimeout = 900;
int seconds_till_retry = 5;
-int udp_rcvbuf = 0;
-int udp_sndbuf = 0;
+int max_connection_burst = 100;
listen_socket_t listen_socket[MAXSOCKETS];
int listen_sockets;
-#ifndef HAVE_MINGW
-io_t unix_socket;
-#endif
list_t *outgoing_list = NULL;
/* Setup sockets */
#endif
}
-static bool bind_to_interface(int sd) {
- char *iface;
+static bool bind_to_address(connection_t *c) {
+ int s = -1;
-#if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
- struct ifreq ifr;
- int status;
-#endif /* defined(SOL_SOCKET) && defined(SO_BINDTODEVICE) */
+ for(int i = 0; i < listen_sockets && listen_socket[i].bindto; i++) {
+ if(listen_socket[i].sa.sa.sa_family != c->address.sa.sa_family)
+ continue;
+ if(s >= 0)
+ return false;
+ s = i;
+ }
- if(!get_config_string (lookup_config (config_tree, "BindToInterface"), &iface))
- return true;
+ if(s < 0)
+ return false;
-#if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
- memset(&ifr, 0, sizeof(ifr));
- strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
- ifr.ifr_ifrn.ifrn_name[IFNAMSIZ - 1] = 0;
-
- status = setsockopt(sd, SOL_SOCKET, SO_BINDTODEVICE, (void *)&ifr, sizeof(ifr));
- if(status) {
- logger(DEBUG_ALWAYS, LOG_ERR, "Can't bind to interface %s: %s", iface,
- strerror(errno));
+ sockaddr_t sa = listen_socket[s].sa;
+ if(sa.sa.sa_family == AF_INET)
+ sa.in.sin_port = 0;
+ else if(sa.sa.sa_family == AF_INET6)
+ sa.in6.sin6_port = 0;
+
+ if(bind(c->socket, &sa.sa, SALEN(sa.sa))) {
+ logger(DEBUG_CONNECTIONS, LOG_WARNING, "Can't bind outgoing socket: %s", strerror(errno));
return false;
}
-#else /* if !defined(SOL_SOCKET) || !defined(SO_BINDTODEVICE) */
- logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "BindToInterface");
-#endif
return true;
}
setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, (void *)&option, sizeof option);
setsockopt(nfd, SOL_SOCKET, SO_BROADCAST, (void *)&option, sizeof option);
- if(udp_rcvbuf && setsockopt(nfd, SOL_SOCKET, SO_RCVBUF, (void *)&udp_rcvbuf, sizeof(udp_rcvbuf)))
- logger(DEBUG_ALWAYS, LOG_WARNING, "Can't set UDP SO_RCVBUF to %i: %s", udp_rcvbuf, strerror(errno));
-
- if(udp_sndbuf && setsockopt(nfd, SOL_SOCKET, SO_SNDBUF, (void *)&udp_sndbuf, sizeof(udp_sndbuf)))
- logger(DEBUG_ALWAYS, LOG_WARNING, "Can't set UDP SO_SNDBUF to %i: %s", udp_sndbuf, strerror(errno));
-
#if defined(IPPROTO_IPV6) && defined(IPV6_V6ONLY)
if(sa->sa.sa_family == AF_INET6)
setsockopt(nfd, IPPROTO_IPV6, IPV6_V6ONLY, (void *)&option, sizeof option);
#warning No way to disable IPv6 fragmentation
#endif
- if (!bind_to_interface(nfd)) {
- closesocket(nfd);
- return -1;
- }
-
if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
closesocket(nfd);
addrstr = sockaddr2hostname(sa);
void finish_connecting(connection_t *c) {
logger(DEBUG_CONNECTIONS, LOG_INFO, "Connected to %s (%s)", c->name, c->hostname);
- if(proxytype != PROXY_EXEC)
- configure_tcp(c);
-
- c->last_ping_time = time(NULL);
+ c->last_ping_time = now.tv_sec;
c->status.connecting = false;
send_id(c);
setenv("REMOTEPORT", port, true);
setenv("NODE", c->name, true);
setenv("NAME", myself->name, true);
- if(netname)
- setenv("NETNAME", netname, true);
int result = system(command);
if(result < 0)
}
static void handle_meta_write(connection_t *c) {
+ if(c->outbuf.len <= c->outbuf.offset)
+ return;
+
ssize_t outlen = send(c->socket, c->outbuf.data + c->outbuf.offset, c->outbuf.len - c->outbuf.offset, 0);
if(outlen <= 0) {
if(!errno || errno == EPIPE) {
int result;
socklen_t len = sizeof result;
- getsockopt(c->socket, SOL_SOCKET, SO_ERROR, &result, &len);
+ getsockopt(c->socket, SOL_SOCKET, SO_ERROR, (void *)&result, &len);
if(!result)
finish_connecting(c);
}
logger(DEBUG_CONNECTIONS, LOG_INFO, "Using proxy at %s port %s", proxyhost, proxyport);
c->socket = socket(proxyai->ai_family, SOCK_STREAM, IPPROTO_TCP);
+ configure_tcp(c);
}
if(c->socket == -1) {
setsockopt(c->socket, SOL_IPV6, IPV6_V6ONLY, (void *)&option, sizeof option);
#endif
- bind_to_interface(c->socket);
+ bind_to_address(c);
}
/* Connect */
c->outdigest = myself->connection->outdigest;
c->outmaclength = myself->connection->outmaclength;
c->outcompression = myself->connection->outcompression;
- c->last_ping_time = time(NULL);
+ c->last_ping_time = now.tv_sec;
connection_add(c);
return true;
}
+// Find edges pointing to this node, and use them to build a list of unique, known addresses.
+static struct addrinfo *get_known_addresses(node_t *n) {
+ struct addrinfo *ai = NULL;
+
+ for splay_each(edge_t, e, n->edge_tree) {
+ if(!e->reverse)
+ continue;
+
+ bool found = false;
+ for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
+ if(!sockaddrcmp(&e->reverse->address, (sockaddr_t *)aip->ai_addr)) {
+ found = true;
+ break;
+ }
+ }
+ if(found)
+ continue;
+
+ struct addrinfo *nai = xzalloc(sizeof *nai);
+ if(ai)
+ ai->ai_next = nai;
+ ai = nai;
+ ai->ai_family = e->reverse->address.sa.sa_family;
+ ai->ai_socktype = SOCK_STREAM;
+ ai->ai_protocol = IPPROTO_TCP;
+ ai->ai_addrlen = SALEN(e->reverse->address.sa);
+ ai->ai_addr = xmalloc(ai->ai_addrlen);
+ memcpy(ai->ai_addr, &e->reverse->address, ai->ai_addrlen);
+ }
+
+ return ai;
+}
+
void setup_outgoing_connection(outgoing_t *outgoing) {
timeout_del(&outgoing->ev);
outgoing->cfg = lookup_config(outgoing->config_tree, "Address");
if(!outgoing->cfg) {
- logger(DEBUG_ALWAYS, LOG_ERR, "No address specified for %s", outgoing->name);
- return;
+ if(n)
+ outgoing->aip = outgoing->ai = get_known_addresses(n);
+ if(!outgoing->ai) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "No address known for %s", outgoing->name);
+ return;
+ }
}
do_outgoing_connection(outgoing);
sockaddrunmap(&sa);
- c = new_connection();
- c->name = xstrdup("<unknown>");
- c->outcipher = myself->connection->outcipher;
- c->outdigest = myself->connection->outdigest;
- c->outmaclength = myself->connection->outmaclength;
- c->outcompression = myself->connection->outcompression;
+ // Check if we get many connections from the same host
- c->address = sa;
- c->hostname = sockaddr2hostname(&sa);
- c->socket = fd;
- c->last_ping_time = time(NULL);
+ static sockaddr_t prev_sa;
+ static int tarpit = -1;
- logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection from %s", c->hostname);
+ if(tarpit >= 0) {
+ closesocket(tarpit);
+ tarpit = -1;
+ }
- io_add(&c->io, handle_meta_io, c, c->socket, IO_READ);
+ if(!sockaddrcmp_noport(&sa, &prev_sa)) {
+ static int samehost_burst;
+ static int samehost_burst_time;
- configure_tcp(c);
+ if(now.tv_sec - samehost_burst_time > samehost_burst)
+ samehost_burst = 0;
+ else
+ samehost_burst -= now.tv_sec - samehost_burst_time;
- connection_add(c);
+ samehost_burst_time = now.tv_sec;
+ samehost_burst++;
- c->allow_request = ID;
- send_id(c);
-}
+ if(samehost_burst > max_connection_burst) {
+ tarpit = fd;
+ return;
+ }
+ }
-#ifndef HAVE_MINGW
-/*
- accept a new UNIX socket connection
-*/
-void handle_new_unix_connection(void *data, int flags) {
- io_t *io = data;
- connection_t *c;
- sockaddr_t sa;
- int fd;
- socklen_t len = sizeof sa;
+ memcpy(&prev_sa, &sa, sizeof sa);
- fd = accept(io->fd, &sa.sa, &len);
+ // Check if we get many connections from different hosts
- if(fd < 0) {
- logger(DEBUG_ALWAYS, LOG_ERR, "Accepting a new connection failed: %s", sockstrerror(sockerrno));
+ static int connection_burst;
+ static int connection_burst_time;
+
+ if(now.tv_sec - connection_burst_time > connection_burst)
+ connection_burst = 0;
+ else
+ connection_burst -= now.tv_sec - connection_burst_time;
+
+ connection_burst_time = now.tv_sec;
+ connection_burst++;
+
+ if(connection_burst >= max_connection_burst) {
+ connection_burst = max_connection_burst;
+ tarpit = fd;
return;
}
- sockaddrunmap(&sa);
+ // Accept the new connection
c = new_connection();
- c->name = xstrdup("<control>");
+ c->name = xstrdup("<unknown>");
+ c->outcipher = myself->connection->outcipher;
+ c->outdigest = myself->connection->outdigest;
+ c->outmaclength = myself->connection->outmaclength;
+ c->outcompression = myself->connection->outcompression;
+
c->address = sa;
- c->hostname = xstrdup("localhost port unix");
+ c->hostname = sockaddr2hostname(&sa);
c->socket = fd;
- c->last_ping_time = time(NULL);
+ c->last_ping_time = now.tv_sec;
logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection from %s", c->hostname);
io_add(&c->io, handle_meta_io, c, c->socket, IO_READ);
+ configure_tcp(c);
+
connection_add(c);
c->allow_request = ID;
-
send_id(c);
}
-#endif
static void free_outgoing(outgoing_t *outgoing) {
timeout_del(&outgoing->ev);
}
if(!found) {
- outgoing_t *outgoing = xmalloc_and_zero(sizeof *outgoing);
+ outgoing_t *outgoing = xzalloc(sizeof *outgoing);
outgoing->name = name;
list_insert_tail(outgoing_list, outgoing);
setup_outgoing_connection(outgoing);
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