/*
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 */
unsigned long arg = 1;
if(ioctlsocket(c->socket, FIONBIO, &arg) != 0) {
- logger(DEBUG_ALWAYS, LOG_ERR, "ioctlsocket for %s: %d", c->hostname, sockstrerror(sockerrno));
+ logger(DEBUG_ALWAYS, LOG_ERR, "ioctlsocket for %s: %s", c->hostname, sockstrerror(sockerrno));
}
#endif
return nfd;
} /* int setup_vpn_in_socket */
-static void retry_outgoing_handler(int fd, short events, void *data) {
+static void retry_outgoing_handler(void *data) {
setup_outgoing_connection(data);
}
if(outgoing->timeout > maxtimeout)
outgoing->timeout = maxtimeout;
- timeout_set(&outgoing->ev, retry_outgoing_handler, outgoing);
- event_add(&outgoing->ev, &(struct timeval){outgoing->timeout, 0});
+ timeout_add(&outgoing->ev, retry_outgoing_handler, outgoing, &(struct timeval){outgoing->timeout, rand() % 100000});
- logger(DEBUG_CONNECTIONS, LOG_NOTICE,
- "Trying to re-establish outgoing connection in %d seconds",
- outgoing->timeout);
+ logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Trying to re-establish outgoing connection in %d seconds", outgoing->timeout);
}
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);
#endif
}
-static void handle_meta_write(int sock, short events, void *data) {
- connection_t *c = data;
+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) {
}
buffer_read(&c->outbuf, outlen);
- if(!c->outbuf.len && event_initialized(&c->outevent))
- event_del(&c->outevent);
+ if(!c->outbuf.len)
+ io_set(&c->io, IO_READ);
}
+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(c);
+ else
+ handle_meta_connection_data(c);
+}
bool do_outgoing_connection(outgoing_t *outgoing) {
char *address, *port, *space;
}
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) {
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);
- event_set(&c->inevent, c->socket, EV_READ | EV_PERSIST, handle_meta_connection_data, c);
- event_set(&c->outevent, c->socket, EV_WRITE | EV_PERSIST, handle_meta_write, c);
- event_add(&c->inevent, NULL);
+ io_add(&c->io, handle_meta_io, c, c->socket, IO_READ|IO_WRITE);
return true;
}
void setup_outgoing_connection(outgoing_t *outgoing) {
- if(event_initialized(&outgoing->ev))
- event_del(&outgoing->ev);
+ timeout_del(&outgoing->ev);
node_t *n = lookup_node(outgoing->name);
accept a new tcp connect and create a
new connection
*/
-void handle_new_meta_connection(int sock, short events, void *data) {
+void handle_new_meta_connection(void *data, int flags) {
+ listen_socket_t *l = data;
connection_t *c;
sockaddr_t sa;
int fd;
socklen_t len = sizeof sa;
- fd = accept(sock, &sa.sa, &len);
+ fd = accept(l->tcp.fd, &sa.sa, &len);
if(fd < 0) {
logger(DEBUG_ALWAYS, LOG_ERR, "Accepting a new connection failed: %s", sockstrerror(sockerrno));
sockaddrunmap(&sa);
+ // Check if we get many connections from the same host
+
+ static sockaddr_t prev_sa;
+ static time_t prev_time;
+ static int tarpit = -1;
+
+ if(tarpit >= 0) {
+ closesocket(tarpit);
+ tarpit = -1;
+ }
+
+ if(prev_time == now.tv_sec && !sockaddrcmp_noport(&sa, &prev_sa)) {
+ // if so, keep the connection open but ignore it completely.
+ tarpit = fd;
+ return;
+ }
+
+ memcpy(&prev_sa, &sa, sizeof sa);
+ prev_time = now.tv_sec;
+
+ // 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);
- event_set(&c->inevent, c->socket, EV_READ | EV_PERSIST, handle_meta_connection_data, c);
- event_set(&c->outevent, c->socket, EV_WRITE | EV_PERSIST, handle_meta_write, c);
- event_add(&c->inevent, NULL);
-
+ io_add(&c->io, handle_meta_io, c, c->socket, IO_READ);
+
configure_tcp(c);
connection_add(c);
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) {
- if(event_initialized(&outgoing->ev))
- event_del(&outgoing->ev);
+ timeout_del(&outgoing->ev);
if(outgoing->ai)
freeaddrinfo(outgoing->ai);
+ if(outgoing->config_tree)
+ exit_configuration(&outgoing->config_tree);
+
if(outgoing->name)
free(outgoing->name);
}
void try_outgoing_connections(void) {
- static config_t *cfg = NULL;
- char *name;
- outgoing_t *outgoing;
-
/* If there is no outgoing list yet, create one. Otherwise, mark all outgoings as deleted. */
if(!outgoing_list) {
outgoing_list = list_alloc((list_action_t)free_outgoing);
} else {
- for(list_node_t *i = outgoing_list->head; i; i = i->next) {
- outgoing = i->data;
+ for list_each(outgoing_t, outgoing, outgoing_list)
outgoing->timeout = -1;
- }
}
/* Make sure there is one outgoing_t in the list for each ConnectTo. */
- for(cfg = lookup_config(config_tree, "ConnectTo"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
+ for(config_t *cfg = lookup_config(config_tree, "ConnectTo"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
+ char *name;
get_config_string(cfg, &name);
if(!check_id(name)) {
bool found = false;
- for(list_node_t *i = outgoing_list->head; i; i = i->next) {
- outgoing = i->data;
+ for list_each(outgoing_t, outgoing, outgoing_list) {
if(!strcmp(outgoing->name, name)) {
found = true;
outgoing->timeout = 0;
}
if(!found) {
- 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);
/* Terminate any connections whose outgoing_t is to be deleted. */
- for(list_node_t *node = connection_list->head, *next; node; node = next) {
- next = node->next;
- connection_t *c = node->data;
+ for list_each(connection_t, c, connection_list) {
if(c->outgoing && c->outgoing->timeout == -1) {
c->outgoing = NULL;
logger(DEBUG_CONNECTIONS, LOG_INFO, "No more outgoing connection to %s", c->name);
/* Delete outgoing_ts for which there is no ConnectTo. */
- for(list_node_t *node = outgoing_list->head, *next; node; node = next) {
- next = node->next;
- outgoing = node->data;
+ for list_each(outgoing_t, outgoing, outgoing_list)
if(outgoing->timeout == -1)
list_delete_node(outgoing_list, node);
- }
}