/*
net_socket.c -- Handle various kinds of sockets.
Copyright (C) 1998-2005 Ivo Timmermans,
- 2000-2012 Guus Sliepen <guus@tinc-vpn.org>
+ 2000-2018 Guus Sliepen <guus@tinc-vpn.org>
2006 Scott Lamb <slamb@slamb.org>
2009 Florian Forster <octo@verplant.org>
#include "system.h"
-#include "splay_tree.h"
+#include "address_cache.h"
#include "conf.h"
#include "connection.h"
+#include "crypto.h"
+#include "list.h"
#include "logger.h"
-#include "meta.h"
+#include "names.h"
#include "net.h"
#include "netutl.h"
#include "protocol.h"
#include "utils.h"
#include "xalloc.h"
-/* Needed on Mac OS/X */
-#ifndef SOL_TCP
-#define SOL_TCP IPPROTO_TCP
-#endif
-
int addressfamily = AF_UNSPEC;
int maxtimeout = 900;
int seconds_till_retry = 5;
-int udp_rcvbuf = 0;
-int udp_sndbuf = 0;
+int udp_rcvbuf = 1024 * 1024;
+int udp_sndbuf = 1024 * 1024;
+bool udp_rcvbuf_warnings;
+bool udp_sndbuf_warnings;
+int max_connection_burst = 10;
+int fwmark;
listen_socket_t listen_socket[MAXSOCKETS];
int listen_sockets;
-list_t *outgoing_list = NULL;
+#ifndef HAVE_WINDOWS
+io_t unix_socket;
+#endif
+
+static void free_outgoing(outgoing_t *outgoing) {
+ timeout_del(&outgoing->ev);
+ free(outgoing);
+}
+
+list_t outgoing_list = {
+ .head = NULL,
+ .tail = NULL,
+ .count = 0,
+ .delete = (list_action_t)free_outgoing,
+};
/* Setup sockets */
int flags = fcntl(c->socket, F_GETFL);
if(fcntl(c->socket, F_SETFL, flags | O_NONBLOCK) < 0) {
- logger(DEBUG_ALWAYS, LOG_ERR, "fcntl for %s: %s", c->hostname, strerror(errno));
+ logger(DEBUG_ALWAYS, LOG_ERR, "fcntl for %s fd %d: %s", c->hostname, c->socket, strerror(errno));
}
+
#elif defined(WIN32)
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 fd %d: %s", c->hostname, c->socket, sockstrerror(sockerrno));
}
+
#endif
-#if defined(SOL_TCP) && defined(TCP_NODELAY)
+#if defined(TCP_NODELAY)
option = 1;
- setsockopt(c->socket, SOL_TCP, TCP_NODELAY, (void *)&option, sizeof option);
+ setsockopt(c->socket, IPPROTO_TCP, TCP_NODELAY, (void *)&option, sizeof(option));
+#endif
+
+#if defined(IP_TOS) && defined(IPTOS_LOWDELAY)
+ option = IPTOS_LOWDELAY;
+ setsockopt(c->socket, IPPROTO_IP, IP_TOS, (void *)&option, sizeof(option));
#endif
-#if defined(SOL_IP) && defined(IP_TOS) && defined(IPTOS_LOWDELAY)
+#if defined(IPV6_TCLASS) && defined(IPTOS_LOWDELAY)
option = IPTOS_LOWDELAY;
- setsockopt(c->socket, SOL_IP, IP_TOS, (void *)&option, sizeof option);
+ setsockopt(c->socket, IPPROTO_IPV6, IPV6_TCLASS, (void *)&option, sizeof(option));
+#endif
+
+#if defined(SO_MARK)
+
+ if(fwmark) {
+ setsockopt(c->socket, SOL_SOCKET, SO_MARK, (void *)&fwmark, sizeof(fwmark));
+ }
+
#endif
}
int status;
#endif /* defined(SOL_SOCKET) && defined(SO_BINDTODEVICE) */
- if(!get_config_string (lookup_config (config_tree, "BindToInterface"), &iface))
+ if(!get_config_string(lookup_config(&config_tree, "BindToInterface"), &iface)) {
return true;
+ }
#if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
memset(&ifr, 0, sizeof(ifr));
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));
+ sockstrerror(sockerrno));
return false;
}
+
#else /* if !defined(SOL_SOCKET) || !defined(SO_BINDTODEVICE) */
+ (void)sd;
logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "BindToInterface");
#endif
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", sockstrerror(sockerrno));
+ return false;
+ }
+
+ return true;
+}
+
+static bool try_bind(int nfd, const sockaddr_t *sa, const char *type) {
+ if(!bind(nfd, &sa->sa, SALEN(sa->sa))) {
+ return true;
+ }
+
+ closesocket(nfd);
+ char *addrstr = sockaddr2hostname(sa);
+ logger(DEBUG_ALWAYS, LOG_ERR, "Can't bind to %s/%s: %s", addrstr, type, sockstrerror(sockerrno));
+ free(addrstr);
+ return false;
+}
+
int setup_listen_socket(const sockaddr_t *sa) {
int nfd;
- char *addrstr;
int option;
char *iface;
/* Optimize TCP settings */
option = 1;
- setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, (void *)&option, sizeof option);
+ setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, (void *)&option, sizeof(option));
+
+#if defined(IPV6_V6ONLY)
+
+ if(sa->sa.sa_family == AF_INET6) {
+ setsockopt(nfd, IPPROTO_IPV6, IPV6_V6ONLY, (void *)&option, sizeof(option));
+ }
+
+#else
+#warning IPV6_V6ONLY not defined
+#endif
+
+#if defined(SO_MARK)
+
+ if(fwmark) {
+ setsockopt(nfd, SOL_SOCKET, SO_MARK, (void *)&fwmark, sizeof(fwmark));
+ }
-#if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
- if(sa->sa.sa_family == AF_INET6)
- setsockopt(nfd, SOL_IPV6, IPV6_V6ONLY, (void *)&option, sizeof option);
#endif
if(get_config_string
- (lookup_config(config_tree, "BindToInterface"), &iface)) {
+ (lookup_config(&config_tree, "BindToInterface"), &iface)) {
#if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
struct ifreq ifr;
- memset(&ifr, 0, sizeof ifr);
+ memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
+ ifr.ifr_ifrn.ifrn_name[IFNAMSIZ - 1] = 0;
- if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, (void *)&ifr, sizeof ifr)) {
+ if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, (void *)&ifr, sizeof(ifr))) {
closesocket(nfd);
logger(DEBUG_ALWAYS, LOG_ERR, "Can't bind to interface %s: %s", iface,
- strerror(sockerrno));
+ sockstrerror(sockerrno));
return -1;
}
+
#else
logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "BindToInterface");
#endif
}
- if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
- closesocket(nfd);
- addrstr = sockaddr2hostname(sa);
- logger(DEBUG_ALWAYS, LOG_ERR, "Can't bind to %s/tcp: %s", addrstr, sockstrerror(sockerrno));
- free(addrstr);
+ if(!try_bind(nfd, sa, "tcp")) {
return -1;
}
return nfd;
}
+static void set_udp_buffer(int nfd, int type, const char *name, int size, bool warnings) {
+ if(!size) {
+ return;
+ }
+
+ if(setsockopt(nfd, SOL_SOCKET, type, (void *)&size, sizeof(size))) {
+ logger(DEBUG_ALWAYS, LOG_WARNING, "Can't set UDP %s to %i: %s", name, size, sockstrerror(sockerrno));
+ return;
+ }
+
+ if(!warnings) {
+ return;
+ }
+
+ // The system may cap the requested buffer size.
+ // Read back the value and check if it is now as requested.
+ int actual = -1;
+ socklen_t optlen = sizeof(actual);
+
+ if(getsockopt(nfd, SOL_SOCKET, type, (void *)&actual, &optlen)) {
+ logger(DEBUG_ALWAYS, LOG_WARNING, "Can't read back UDP %s: %s", name, sockstrerror(sockerrno));
+ } else if(optlen != sizeof(actual)) {
+ logger(DEBUG_ALWAYS, LOG_WARNING, "Can't read back UDP %s: unexpected returned optlen %d", name, (int)optlen);
+ } else if(actual < size) {
+ logger(DEBUG_ALWAYS, LOG_WARNING, "Can't set UDP %s to %i, the system set it to %i instead", name, size, actual);
+ }
+}
+
int setup_vpn_in_socket(const sockaddr_t *sa) {
int nfd;
- char *addrstr;
int option;
nfd = socket(sa->sa.sa_family, SOCK_DGRAM, IPPROTO_UDP);
if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) {
closesocket(nfd);
logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "fcntl",
- strerror(errno));
+ strerror(errno));
return -1;
}
}
#elif defined(WIN32)
{
unsigned long arg = 1;
+
if(ioctlsocket(nfd, FIONBIO, &arg) != 0) {
closesocket(nfd);
logger(DEBUG_ALWAYS, LOG_ERR, "Call to `%s' failed: %s", "ioctlsocket", sockstrerror(sockerrno));
#endif
option = 1;
- setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, (void *)&option, sizeof option);
- setsockopt(nfd, SOL_SOCKET, SO_BROADCAST, (void *)&option, sizeof option);
+ setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, (void *)&option, sizeof(option));
+ setsockopt(nfd, SOL_SOCKET, SO_BROADCAST, (void *)&option, sizeof(option));
+
+ set_udp_buffer(nfd, SO_RCVBUF, "SO_RCVBUF", udp_rcvbuf, udp_rcvbuf_warnings);
+ set_udp_buffer(nfd, SO_SNDBUF, "SO_SNDBUF", udp_sndbuf, udp_sndbuf_warnings);
- 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 defined(IPV6_V6ONLY)
- 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(sa->sa.sa_family == AF_INET6) {
+ setsockopt(nfd, IPPROTO_IPV6, IPV6_V6ONLY, (void *)&option, sizeof(option));
+ }
-#if defined(IPPROTO_IPV6) && defined(IPV6_V6ONLY)
- if(sa->sa.sa_family == AF_INET6)
- setsockopt(nfd, IPPROTO_IPV6, IPV6_V6ONLY, (void *)&option, sizeof option);
#endif
#if defined(IP_DONTFRAG) && !defined(IP_DONTFRAGMENT)
#define IP_DONTFRAGMENT IP_DONTFRAG
#endif
-#if defined(SOL_IP) && defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DO)
+#if defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DO)
+
if(myself->options & OPTION_PMTU_DISCOVERY) {
option = IP_PMTUDISC_DO;
- setsockopt(nfd, SOL_IP, IP_MTU_DISCOVER, (void *)&option, sizeof(option));
+ setsockopt(nfd, IPPROTO_IP, IP_MTU_DISCOVER, (void *)&option, sizeof(option));
}
-#elif defined(IPPROTO_IP) && defined(IP_DONTFRAGMENT)
+
+#elif defined(IP_DONTFRAGMENT)
+
if(myself->options & OPTION_PMTU_DISCOVERY) {
option = 1;
setsockopt(nfd, IPPROTO_IP, IP_DONTFRAGMENT, (void *)&option, sizeof(option));
}
-#else
-#warning No way to disable IPv4 fragmentation
+
#endif
-#if defined(SOL_IPV6) && defined(IPV6_MTU_DISCOVER) && defined(IPV6_PMTUDISC_DO)
+#if defined(IPV6_MTU_DISCOVER) && defined(IPV6_PMTUDISC_DO)
+
if(myself->options & OPTION_PMTU_DISCOVERY) {
option = IPV6_PMTUDISC_DO;
- setsockopt(nfd, SOL_IPV6, IPV6_MTU_DISCOVER, (void *)&option, sizeof(option));
+ setsockopt(nfd, IPPROTO_IPV6, IPV6_MTU_DISCOVER, (void *)&option, sizeof(option));
}
-#elif defined(IPPROTO_IPV6) && defined(IPV6_DONTFRAG)
+
+#elif defined(IPV6_DONTFRAG)
+
if(myself->options & OPTION_PMTU_DISCOVERY) {
option = 1;
setsockopt(nfd, IPPROTO_IPV6, IPV6_DONTFRAG, (void *)&option, sizeof(option));
}
-#else
-#warning No way to disable IPv6 fragmentation
+
#endif
- if (!bind_to_interface(nfd)) {
+#if defined(SO_MARK)
+
+ if(fwmark) {
+ setsockopt(nfd, SOL_SOCKET, SO_MARK, (void *)&fwmark, sizeof(fwmark));
+ }
+
+#endif
+
+ if(!bind_to_interface(nfd)) {
closesocket(nfd);
return -1;
}
- if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
- closesocket(nfd);
- addrstr = sockaddr2hostname(sa);
- logger(DEBUG_ALWAYS, LOG_ERR, "Can't bind to %s/udp: %s", addrstr, sockstrerror(sockerrno));
- free(addrstr);
+ if(!try_bind(nfd, sa, "udp")) {
return -1;
}
return nfd;
} /* int setup_vpn_in_socket */
-static void retry_outgoing_handler(int fd, short events, void *data) {
- setup_outgoing_connection(data);
+static void retry_outgoing_handler(void *data) {
+ setup_outgoing_connection(data, true);
}
void retry_outgoing(outgoing_t *outgoing) {
outgoing->timeout += 5;
- if(outgoing->timeout > maxtimeout)
+ 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, jitter()
+ });
- 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);
}
-static void do_outgoing_pipe(connection_t *c, char *command) {
-#ifndef HAVE_MINGW
+static void do_outgoing_pipe(connection_t *c, const char *command) {
+#ifndef HAVE_WINDOWS
int fd[2];
if(socketpair(AF_UNIX, SOCK_STREAM, 0, fd)) {
- logger(DEBUG_ALWAYS, LOG_ERR, "Could not create socketpair: %s\n", strerror(errno));
+ logger(DEBUG_ALWAYS, LOG_ERR, "Could not create socketpair: %s", sockstrerror(sockerrno));
return;
}
sockaddr2str(&c->address, &host, &port);
setenv("REMOTEADDRESS", host, true);
setenv("REMOTEPORT", port, true);
- setenv("NODE", c->name, true);
setenv("NAME", myself->name, true);
- if(netname)
+
+ if(c->name) {
+ setenv("NODE", c->name, true);
+ }
+
+ if(netname) {
setenv("NETNAME", netname, true);
+ }
int result = system(command);
- if(result < 0)
- logger(DEBUG_ALWAYS, LOG_ERR, "Could not execute %s: %s\n", command, strerror(errno));
- else if(result)
+
+ if(result < 0) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Could not execute %s: %s", command, strerror(errno));
+ } else if(result) {
logger(DEBUG_ALWAYS, LOG_ERR, "%s exited with non-zero status %d", command, result);
+ }
+
exit(result);
#else
+ (void)c;
+ (void)command;
logger(DEBUG_ALWAYS, LOG_ERR, "Proxy type exec not supported on this platform!");
return;
#endif
}
-bool do_outgoing_connection(connection_t *c) {
- char *address, *port, *space;
- struct addrinfo *proxyai = NULL;
- int result;
-
- if(!c->outgoing) {
- logger(DEBUG_ALWAYS, LOG_ERR, "do_outgoing_connection() for %s called without c->outgoing", c->name);
- abort();
+static void handle_meta_write(connection_t *c) {
+ if(c->outbuf.len <= c->outbuf.offset) {
+ return;
}
-begin:
- if(!c->outgoing->ai) {
- if(!c->outgoing->cfg) {
- logger(DEBUG_CONNECTIONS, LOG_ERR, "Could not set up a meta connection to %s",
- c->name);
- retry_outgoing(c->outgoing);
- c->outgoing = NULL;
- connection_del(c);
- return false;
- }
-
- get_config_string(c->outgoing->cfg, &address);
+ ssize_t outlen = send(c->socket, c->outbuf.data + c->outbuf.offset, c->outbuf.len - c->outbuf.offset, 0);
- space = strchr(address, ' ');
- if(space) {
- port = xstrdup(space + 1);
- *space = 0;
+ if(outlen <= 0) {
+ if(!sockerrno || sockerrno == EPIPE) {
+ logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection closed by %s (%s)", c->name, c->hostname);
+ } else if(sockwouldblock(sockerrno)) {
+ logger(DEBUG_META, LOG_DEBUG, "Sending %d bytes to %s (%s) would block", c->outbuf.len - c->outbuf.offset, c->name, c->hostname);
+ return;
} else {
- if(!get_config_string(lookup_config(c->config_tree, "Port"), &port))
- port = xstrdup("655");
+ logger(DEBUG_CONNECTIONS, LOG_ERR, "Could not send %d bytes of data to %s (%s): %s", c->outbuf.len - c->outbuf.offset, c->name, c->hostname, sockstrerror(sockerrno));
}
- c->outgoing->ai = str2addrinfo(address, port, SOCK_STREAM);
- free(address);
- free(port);
+ terminate_connection(c, c->edge);
+ return;
+ }
+
+ buffer_read(&c->outbuf, outlen);
- c->outgoing->aip = c->outgoing->ai;
- c->outgoing->cfg = lookup_config_next(c->config_tree, c->outgoing->cfg);
+ if(!c->outbuf.len) {
+ io_set(&c->io, IO_READ);
}
+}
- if(!c->outgoing->aip) {
- if(c->outgoing->ai)
- freeaddrinfo(c->outgoing->ai);
- c->outgoing->ai = NULL;
- goto begin;
+static void handle_meta_io(void *data, int flags) {
+ connection_t *c = data;
+
+ if(c->status.connecting) {
+ /*
+ The event loop does not protect against spurious events. Verify that we are actually connected
+ by issuing an empty send() call.
+
+ Note that the behavior of send() on potentially unconnected sockets differ between platforms:
+ +------------+-----------+-------------+-----------+
+ | Event | POSIX | Linux | Windows |
+ +------------+-----------+-------------+-----------+
+ | Spurious | ENOTCONN | EWOULDBLOCK | ENOTCONN |
+ | Failed | ENOTCONN | (cause) | ENOTCONN |
+ | Successful | (success) | (success) | (success) |
+ +------------+-----------+-------------+-----------+
+ */
+ if(send(c->socket, NULL, 0, 0) != 0) {
+ if(sockwouldblock(sockerrno)) {
+ return;
+ }
+
+ int socket_error;
+
+ if(!socknotconn(sockerrno)) {
+ socket_error = sockerrno;
+ } else {
+ socklen_t len = sizeof(socket_error);
+ getsockopt(c->socket, SOL_SOCKET, SO_ERROR, (void *)&socket_error, &len);
+ }
+
+ if(socket_error) {
+ logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Error while connecting to %s (%s): %s", c->name, c->hostname, sockstrerror(socket_error));
+ terminate_connection(c, false);
+ }
+
+ return;
+ }
+
+ c->status.connecting = false;
+ finish_connecting(c);
+ }
+
+ if(flags & IO_WRITE) {
+ handle_meta_write(c);
+ } else {
+ handle_meta_connection_data(c);
}
+}
+
+bool do_outgoing_connection(outgoing_t *outgoing) {
+ const sockaddr_t *sa;
+ struct addrinfo *proxyai = NULL;
+ int result;
- memcpy(&c->address, c->outgoing->aip->ai_addr, c->outgoing->aip->ai_addrlen);
- c->outgoing->aip = c->outgoing->aip->ai_next;
+begin:
+ sa = get_recent_address(outgoing->node->address_cache);
- if(c->hostname)
- free(c->hostname);
+ if(!sa) {
+ logger(DEBUG_CONNECTIONS, LOG_ERR, "Could not set up a meta connection to %s", outgoing->node->name);
+ retry_outgoing(outgoing);
+ return false;
+ }
+ connection_t *c = new_connection();
+ c->outgoing = outgoing;
+ memcpy(&c->address, sa, SALEN(sa->sa));
c->hostname = sockaddr2hostname(&c->address);
- logger(DEBUG_CONNECTIONS, LOG_INFO, "Trying to connect to %s (%s)", c->name,
- c->hostname);
+ logger(DEBUG_CONNECTIONS, LOG_INFO, "Trying to connect to %s (%s)", outgoing->node->name, c->hostname);
if(!proxytype) {
c->socket = socket(c->address.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
do_outgoing_pipe(c, proxyhost);
} else {
proxyai = str2addrinfo(proxyhost, proxyport, SOCK_STREAM);
- if(!proxyai)
+
+ if(!proxyai) {
+ free_connection(c);
goto begin;
+ }
+
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) {
logger(DEBUG_CONNECTIONS, LOG_ERR, "Creating socket for %s failed: %s", c->hostname, sockstrerror(sockerrno));
+ free_connection(c);
goto begin;
}
#endif
if(proxytype != PROXY_EXEC) {
-#if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
+#if defined(IPV6_V6ONLY)
int option = 1;
- if(c->address.sa.sa_family == AF_INET6)
- setsockopt(c->socket, SOL_IPV6, IPV6_V6ONLY, (void *)&option, sizeof option);
+
+ if(c->address.sa.sa_family == AF_INET6) {
+ setsockopt(c->socket, IPPROTO_IPV6, IPV6_V6ONLY, (void *)&option, sizeof(option));
+ }
+
#endif
bind_to_interface(c->socket);
+ bind_to_address(c);
}
/* Connect */
} else if(proxytype == PROXY_EXEC) {
result = 0;
} else {
+ if(!proxyai) {
+ abort();
+ }
+
result = connect(c->socket, proxyai->ai_addr, proxyai->ai_addrlen);
freeaddrinfo(proxyai);
}
- if(result == -1) {
- if(sockinprogress(sockerrno)) {
- c->status.connecting = true;
- return true;
- }
-
- closesocket(c->socket);
-
- logger(DEBUG_CONNECTIONS, LOG_ERR, "%s: %s", c->hostname, sockstrerror(sockerrno));
+ if(result == -1 && !sockinprogress(sockerrno)) {
+ logger(DEBUG_CONNECTIONS, LOG_ERR, "Could not connect to %s (%s): %s", outgoing->node->name, c->hostname, sockstrerror(sockerrno));
+ free_connection(c);
goto begin;
}
- finish_connecting(c);
+ /* Now that there is a working socket, fill in the rest and register this connection. */
- return true;
-}
+ c->last_ping_time = time(NULL);
+ c->status.connecting = true;
+ c->name = xstrdup(outgoing->node->name);
+ c->outmaclength = myself->connection->outmaclength;
+ c->last_ping_time = now.tv_sec;
-static void handle_meta_write(int sock, short events, void *data) {
- connection_t *c = data;
+ connection_add(c);
- ssize_t outlen = send(c->socket, c->outbuf.data + c->outbuf.offset, c->outbuf.len - c->outbuf.offset, 0);
- if(outlen <= 0) {
- logger(DEBUG_ALWAYS, LOG_ERR, "Onoes, outlen = %d (%s)", (int)outlen, strerror(errno));
- terminate_connection(c, c->status.active);
- return;
- }
+ io_add(&c->io, handle_meta_io, c, c->socket, IO_READ | IO_WRITE);
- buffer_read(&c->outbuf, outlen);
- if(!c->outbuf.len && event_initialized(&c->outevent))
- event_del(&c->outevent);
+ return true;
}
-void setup_outgoing_connection(outgoing_t *outgoing) {
- connection_t *c;
- node_t *n;
+void setup_outgoing_connection(outgoing_t *outgoing, bool verbose) {
+ (void)verbose;
+ timeout_del(&outgoing->ev);
- if(event_initialized(&outgoing->ev))
- event_del(&outgoing->ev);
+ node_t *n = outgoing->node;
- n = lookup_node(outgoing->name);
+ if(!n->address_cache) {
+ n->address_cache = open_address_cache(n);
+ }
- if(n)
- if(n->connection) {
- logger(DEBUG_CONNECTIONS, LOG_INFO, "Already connected to %s", outgoing->name);
+ if(n->connection) {
+ logger(DEBUG_CONNECTIONS, LOG_INFO, "Already connected to %s", n->name);
+ if(!n->connection->outgoing) {
n->connection->outgoing = outgoing;
return;
+ } else {
+ goto remove;
}
+ }
- c = new_connection();
- c->name = xstrdup(outgoing->name);
- c->outcipher = myself->connection->outcipher;
- c->outdigest = myself->connection->outdigest;
- c->outmaclength = myself->connection->outmaclength;
- c->outcompression = myself->connection->outcompression;
+ do_outgoing_connection(outgoing);
+ return;
- init_configuration(&c->config_tree);
- read_connection_config(c);
+remove:
+ list_delete(&outgoing_list, outgoing);
+}
- outgoing->cfg = lookup_config(c->config_tree, "Address");
+static bool check_tarpit(const sockaddr_t *sa, int fd) {
+ // Check if we get many connections from the same host
- if(!outgoing->cfg) {
- logger(DEBUG_ALWAYS, LOG_ERR, "No address specified for %s", c->name);
- free_connection(c);
- return;
+ static sockaddr_t prev_sa;
+
+ if(!sockaddrcmp_noport(sa, &prev_sa)) {
+ static time_t samehost_burst;
+ static time_t 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 true;
+ }
}
- c->outgoing = outgoing;
- c->last_ping_time = time(NULL);
+ memcpy(&prev_sa, &sa, sizeof(sa));
- connection_add(c);
+ // Check if we get many connections from different hosts
+
+ static time_t connection_burst;
+ static time_t connection_burst_time;
- if (do_outgoing_connection(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);
+ 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 true;
}
+
+ return false;
}
/*
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) {
+ (void)flags;
+ listen_socket_t *l = data;
connection_t *c;
sockaddr_t sa;
int fd;
- socklen_t len = sizeof sa;
+ 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);
+ if(!is_local_connection(&sa) && check_tarpit(&sa, fd)) {
+ return;
+ }
+
+ // Accept the new connection
+
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;
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);
c->allow_request = ID;
- send_id(c);
}
-static void free_outgoing(outgoing_t *outgoing) {
- if(outgoing->ai)
- freeaddrinfo(outgoing->ai);
+#ifndef HAVE_WINDOWS
+/*
+ accept a new UNIX socket connection
+*/
+void handle_new_unix_connection(void *data, int flags) {
+ (void)flags;
+ io_t *io = data;
+ connection_t *c;
+ sockaddr_t sa;
+ int fd;
+ socklen_t len = sizeof(sa);
- if(outgoing->name)
- free(outgoing->name);
+ fd = accept(io->fd, &sa.sa, &len);
- free(outgoing);
+ 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;
}
+#endif
void try_outgoing_connections(void) {
- static config_t *cfg = NULL;
- char *name;
- outgoing_t *outgoing;
-
- outgoing_list = list_alloc((list_action_t)free_outgoing);
-
- for(cfg = lookup_config(config_tree, "ConnectTo"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
+ /* If there is no outgoing list yet, create one. Otherwise, mark all outgoings as deleted. */
+
+ 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(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)) {
logger(DEBUG_ALWAYS, LOG_ERR,
- "Invalid name for outgoing connection in %s line %d",
- cfg->file, cfg->line);
+ "Invalid name for outgoing connection in %s line %d",
+ cfg->file, cfg->line);
+ free(name);
+ continue;
+ }
+
+ if(!strcmp(name, myself->name)) {
free(name);
continue;
}
- outgoing = xmalloc_and_zero(sizeof *outgoing);
- outgoing->name = name;
- list_insert_tail(outgoing_list, outgoing);
- setup_outgoing_connection(outgoing);
+ bool found = false;
+
+ for list_each(outgoing_t, outgoing, &outgoing_list) {
+ if(!strcmp(outgoing->node->name, name)) {
+ found = true;
+ outgoing->timeout = 0;
+ break;
+ }
+ }
+
+ if(!found) {
+ outgoing_t *outgoing = xzalloc(sizeof(*outgoing));
+ node_t *n = lookup_node(name);
+
+ if(!n) {
+ n = new_node();
+ n->name = xstrdup(name);
+ node_add(n);
+ }
+
+ outgoing->node = n;
+ list_insert_tail(&outgoing_list, outgoing);
+ setup_outgoing_connection(outgoing, true);
+ }
+
+ free(name);
}
+
+ /* Terminate any connections whose outgoing_t is to be deleted. */
+
+ 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);
+ terminate_connection(c, c->edge);
+ }
+ }
+
+ /* Delete outgoing_ts for which there is no ConnectTo. */
+
+ for list_each(outgoing_t, outgoing, &outgoing_list)
+ if(outgoing->timeout == -1) {
+ list_delete_node(&outgoing_list, node);
+ }
}