/*
net_socket.c -- Handle various kinds of sockets.
Copyright (C) 1998-2005 Ivo Timmermans,
- 2000-2012 Guus Sliepen <guus@tinc-vpn.org>
+ 2000-2013 Guus Sliepen <guus@tinc-vpn.org>
2006 Scott Lamb <slamb@slamb.org>
2009 Florian Forster <octo@verplant.org>
#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 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 */
return true;
}
+static bool bind_to_address(connection_t *c) {
+ int s = -1;
+
+ 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(s < 0)
+ return false;
+
+ 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;
+ }
+
+ return true;
+}
+
int setup_listen_socket(const sockaddr_t *sa) {
int nfd;
char *addrstr;
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);
}
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) {
}
static void handle_meta_io(void *data, int flags) {
+ connection_t *c = data;
+
+ if(c->status.connecting) {
+ c->status.connecting = false;
+
+ int result;
+ socklen_t len = sizeof result;
+ getsockopt(c->socket, SOL_SOCKET, SO_ERROR, (void *)&result, &len);
+
+ if(!result)
+ finish_connecting(c);
+ else {
+ logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Error while connecting to %s (%s): %s", c->name, c->hostname, sockstrerror(result));
+ terminate_connection(c, false);
+ return;
+ }
+ }
+
if(flags & IO_WRITE)
- handle_meta_write(data);
+ handle_meta_write(c);
else
- handle_meta_connection_data(data);
+ handle_meta_connection_data(c);
}
bool do_outgoing_connection(outgoing_t *outgoing) {
}
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) {
#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);
- io_add(&c->io, handle_meta_io, c, c->socket, IO_READ);
+ io_add(&c->io, handle_meta_io, c, c->socket, IO_READ|IO_WRITE);
return true;
}
sockaddrunmap(&sa);
+ // Check if we get many connections from the same host
+
+ static sockaddr_t prev_sa;
+ static int tarpit = -1;
+
+ if(tarpit >= 0) {
+ closesocket(tarpit);
+ tarpit = -1;
+ }
+
+ if(!sockaddrcmp_noport(&sa, &prev_sa)) {
+ static int samehost_burst;
+ static int samehost_burst_time;
+
+ if(now.tv_sec - samehost_burst_time > samehost_burst)
+ samehost_burst = 0;
+ else
+ samehost_burst -= now.tv_sec - samehost_burst_time;
+
+ samehost_burst_time = now.tv_sec;
+ samehost_burst++;
+
+ if(samehost_burst > max_connection_burst) {
+ tarpit = fd;
+ return;
+ }
+ }
+
+ memcpy(&prev_sa, &sa, sizeof sa);
+
+ // Check if we get many connections from different hosts
+
+ 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;
+ }
+
+ // Accept the new connection
+
c = new_connection();
c->name = xstrdup("<unknown>");
c->outcipher = myself->connection->outcipher;
c->address = sa;
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);
send_id(c);
}
+#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;
+
+ fd = accept(io->fd, &sa.sa, &len);
+
+ if(fd < 0) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Accepting a new connection failed: %s", sockstrerror(sockerrno));
+ return;
+ }
+
+ sockaddrunmap(&sa);
+
+ c = new_connection();
+ c->name = xstrdup("<control>");
+ c->address = sa;
+ c->hostname = xstrdup("localhost port unix");
+ c->socket = fd;
+ 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);
+
+ 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);
projects / tinc / blobdiff