+/*
+ 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,
+};
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