+++ /dev/null
-/*
- device.c -- UML network socket
- Copyright (C) 2002-2005 Ivo Timmermans,
- 2002-2012 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;
- }
-
-#ifdef FD_CLOEXEC
- fcntl(write_fd, F_SETFD, FD_CLOEXEC);
-#endif
-
- 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;
- }
-
-#ifdef FD_CLOEXEC
- fcntl(data_fd, F_SETFD, FD_CLOEXEC);
-#endif
-
- 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;
- }
-
-#ifdef FD_CLOEXEC
- fcntl(device_fd, F_SETFD, FD_CLOEXEC);
-#endif
-
- 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 inlen;
-
- 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;
- }
-
-#ifdef FD_CLOEXEC
- fcntl(request_fd, F_SETFD, FD_CLOEXEC);
-#endif
-
- 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((inlen = 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((inlen = 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 = inlen;
-
- 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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