X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fuml_device.c;fp=src%2Fuml_device.c;h=26bcb01ca46cda59af67645048cf5c803b869c30;hp=0000000000000000000000000000000000000000;hb=178e52f76ef4ba40748c13ea7e518837394d6dbc;hpb=5672863e59e6a114ac6b66de98254b14266c0e61

diff --git a/src/uml_device.c b/src/uml_device.c
new file mode 100644
index 00000000..26bcb01c
--- /dev/null
+++ b/src/uml_device.c
@@ -0,0 +1,288 @@
+/*
+    device.c -- UML network socket
+    Copyright (C) 2002-2005 Ivo Timmermans,
+                  2002-2011 Guus Sliepen <guus@tinc-vpn.org>
+
+    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 <sys/un.h>
+
+#include "conf.h"
+#include "device.h"
+#include "net.h"
+#include "logger.h"
+#include "utils.h"
+#include "route.h"
+#include "xalloc.h"
+
+static int listen_fd = -1;
+static int request_fd = -1;
+static int data_fd = -1;
+static int write_fd = -1;
+static int state = 0;
+static char *device_info;
+
+extern char *identname;
+extern volatile bool running;
+
+static uint64_t device_total_in = 0;
+static uint64_t device_total_out = 0;
+
+enum request_type { REQ_NEW_CONTROL };
+
+static struct request {
+  uint32_t magic;
+  uint32_t version;
+  enum request_type type;
+  struct sockaddr_un sock;
+} request;
+
+static struct sockaddr_un data_sun;
+
+static bool setup_device(void) {
+	struct sockaddr_un listen_sun;
+	static const int one = 1;
+	struct {
+		char zero;
+		int pid;
+		int usecs;
+	} name;
+	struct timeval tv;
+
+	if(!get_config_string(lookup_config(config_tree, "Device"), &device))
+		xasprintf(&device, LOCALSTATEDIR "/run/%s.umlsocket", identname);
+
+	get_config_string(lookup_config(config_tree, "Interface"), &iface);
+
+	device_info = "UML network socket";
+
+	if((write_fd = socket(PF_UNIX, SOCK_DGRAM, 0)) < 0) {
+		logger(LOG_ERR, "Could not open write %s: %s", device_info, strerror(errno));
+		running = false;
+		return false;
+	}
+
+	setsockopt(write_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one);
+
+	if(fcntl(write_fd, F_SETFL, O_NONBLOCK) < 0) {
+		logger(LOG_ERR, "System call `%s' failed: %s", "fcntl", strerror(errno));
+		running = false;
+		return false;
+	}
+
+	if((data_fd = socket(PF_UNIX, SOCK_DGRAM, 0)) < 0) {
+		logger(LOG_ERR, "Could not open data %s: %s", device_info, strerror(errno));
+		running = false;
+		return false;
+	}
+
+	setsockopt(data_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one);
+
+	if(fcntl(data_fd, F_SETFL, O_NONBLOCK) < 0) {
+		logger(LOG_ERR, "System call `%s' failed: %s", "fcntl", strerror(errno));
+		running = false;
+		return false;
+	}
+
+	name.zero = 0;
+	name.pid = getpid();
+	gettimeofday(&tv, NULL);
+	name.usecs = tv.tv_usec;
+	data_sun.sun_family = AF_UNIX;
+	memcpy(&data_sun.sun_path, &name, sizeof name);
+	
+	if(bind(data_fd, (struct sockaddr *)&data_sun, sizeof data_sun) < 0) {
+		logger(LOG_ERR, "Could not bind data %s: %s", device_info, strerror(errno));
+		running = false;
+		return false;
+	}
+
+	if((listen_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) {
+		logger(LOG_ERR, "Could not open %s: %s", device_info,
+			   strerror(errno));
+		return false;
+	}
+
+	setsockopt(listen_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one);
+
+	if(fcntl(listen_fd, F_SETFL, O_NONBLOCK) < 0) {
+		logger(LOG_ERR, "System call `%s' failed: %s", "fcntl", strerror(errno));
+		return false;
+	}
+
+	listen_sun.sun_family = AF_UNIX;
+	strncpy(listen_sun.sun_path, device, sizeof listen_sun.sun_path);
+	if(bind(listen_fd, (struct sockaddr *)&listen_sun, sizeof listen_sun) < 0) {
+		logger(LOG_ERR, "Could not bind %s to %s: %s", device_info, device, strerror(errno));
+		return false;
+	}
+
+	if(listen(listen_fd, 1) < 0) {
+		logger(LOG_ERR, "Could not listen on %s %s: %s", device_info, device, strerror(errno));
+		return false;
+	}
+
+	device_fd = listen_fd;
+	state = 0;
+
+	logger(LOG_INFO, "%s is a %s", device, device_info);
+
+	if(routing_mode == RMODE_ROUTER)
+		overwrite_mac = true;
+
+	return true;
+}
+
+void close_device(void) {
+	if(listen_fd >= 0)
+		close(listen_fd);
+
+	if(request_fd >= 0)
+		close(request_fd);
+
+	if(data_fd >= 0)
+		close(data_fd);
+
+	if(write_fd >= 0)
+		close(write_fd);
+
+	unlink(device);
+
+	free(device);
+	if(iface) free(iface);
+}
+
+static bool read_packet(vpn_packet_t *packet) {
+	int lenin;
+
+	switch(state) {
+		case 0: {
+			struct sockaddr sa;
+			socklen_t salen = sizeof sa;
+
+			request_fd = accept(listen_fd, &sa, &salen);
+			if(request_fd < 0) {
+				logger(LOG_ERR, "Could not accept connection to %s %s: %s", device_info, device, strerror(errno));
+				return false;
+			}
+
+			if(fcntl(listen_fd, F_SETFL, O_NONBLOCK) < 0) {
+				logger(LOG_ERR, "System call `%s' failed: %s", "fcntl", strerror(errno));
+				running = false;
+				return false;
+			}
+
+			close(listen_fd);
+			listen_fd = -1;
+			device_fd = request_fd;
+			state = 1;
+
+			return false;
+		}
+
+		case 1: {
+			if((lenin = read(request_fd, &request, sizeof request)) != sizeof request) {
+				logger(LOG_ERR, "Error while reading request from %s %s: %s", device_info,
+					   device, strerror(errno));
+				running = false;
+				return false;
+			}
+
+			if(request.magic != 0xfeedface || request.version != 3 || request.type != REQ_NEW_CONTROL) {
+				logger(LOG_ERR, "Unknown magic %x, version %d, request type %d from %s %s",
+						request.magic, request.version, request.type, device_info, device);
+				running = false;
+				return false;
+			}
+
+			if(connect(write_fd, &request.sock, sizeof request.sock) < 0) {
+				logger(LOG_ERR, "Could not bind write %s: %s", device_info, strerror(errno));
+				running = false;
+				return false;
+			}
+
+			write(request_fd, &data_sun, sizeof data_sun);
+			device_fd = data_fd;
+
+			logger(LOG_INFO, "Connection with UML established");
+
+			state = 2;
+			return false;
+		}
+
+		case 2: {
+			if((lenin = read(data_fd, packet->data, MTU)) <= 0) {
+				logger(LOG_ERR, "Error while reading from %s %s: %s", device_info,
+					   device, strerror(errno));
+				running = false;
+				return false;
+			}
+
+			packet->len = lenin;
+
+			device_total_in += packet->len;
+
+			ifdebug(TRAFFIC) logger(LOG_DEBUG, "Read packet of %d bytes from %s", packet->len,
+					   device_info);
+
+			return true;
+		}
+
+		default:
+			logger(LOG_ERR, "Invalid value for state variable in " __FILE__);
+			abort();
+	}
+}
+
+static bool write_packet(vpn_packet_t *packet) {
+	if(state != 2) {
+		ifdebug(TRAFFIC) logger(LOG_DEBUG, "Dropping packet of %d bytes to %s: not connected to UML yet",
+				packet->len, device_info);
+		return false;
+	}
+
+	ifdebug(TRAFFIC) logger(LOG_DEBUG, "Writing packet of %d bytes to %s",
+			   packet->len, device_info);
+
+	if(write(write_fd, packet->data, packet->len) < 0) {
+		if(errno != EINTR && errno != EAGAIN) {
+			logger(LOG_ERR, "Can't write to %s %s: %s", device_info, device, strerror(errno));
+			running = false;
+		}
+
+		return false;
+	}
+
+	device_total_out += packet->len;
+
+	return true;
+}
+
+static void dump_device_stats(void) {
+	logger(LOG_DEBUG, "Statistics for %s %s:", device_info, device);
+	logger(LOG_DEBUG, " total bytes in:  %10"PRIu64, device_total_in);
+	logger(LOG_DEBUG, " total bytes out: %10"PRIu64, device_total_out);
+}
+
+const devops_t uml_devops = {
+	.setup = setup_device,
+	.close = close_device,
+	.read = read_packet,
+	.write = write_packet,
+	.dump_stats = dump_device_stats,
+};