From dcec713675b604f5ef82e64d0671727e3f5ea518 Mon Sep 17 00:00:00 2001 From: Guus Sliepen Date: Sat, 17 Jul 2004 00:09:14 +0000 Subject: [PATCH] Added UML network socket handling. Now you can use tinc instead of uml_switch. --- src/uml_socket/device.c | 292 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 292 insertions(+) create mode 100644 src/uml_socket/device.c diff --git a/src/uml_socket/device.c b/src/uml_socket/device.c new file mode 100644 index 00000000..08339d80 --- /dev/null +++ b/src/uml_socket/device.c @@ -0,0 +1,292 @@ +/* + device.c -- UML network socket + Copyright (C) 2002-2004 Ivo Timmermans , + 2002-2004 Guus Sliepen + + 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., 675 Mass Ave, Cambridge, MA 02139, USA. + + $Id: device.c 1374 2004-03-21 14:21:22Z guus $ +*/ + +#include "system.h" + +#include + +#include "conf.h" +#include "net.h" +#include "logger.h" +#include "utils.h" +#include "route.h" + +#include "system.h" + +int device_fd = -1; +static int listen_fd = -1; +static int request_fd = -1; +static int data_fd = -1; +static int write_fd = -1; +static int state = 0; +char *device; +char *iface; +char *device_info; + +extern char *identname; +extern bool running; + +int device_total_in = 0; +int 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; + +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; + + cp(); + + if(!get_config_string(lookup_config(config_tree, "Device"), &device)) + asprintf(&device, LOCALSTATEDIR "/run/%s.umlsocket", identname); + + if(!get_config_string(lookup_config(config_tree, "Interface"), &iface)) + iface = device; + + 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) +{ + cp(); + + 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); +} + +bool read_packet(vpn_packet_t *packet) +{ + int lenin; + + cp(); + + switch(state) { + case 0: { + struct sockaddr sa; + int 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; + } + } +} + +bool write_packet(vpn_packet_t *packet) +{ + cp(); + + 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 true; + } + + ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Writing packet of %d bytes to %s"), + packet->len, device_info); + + if(sendto(write_fd, packet->data, packet->len, 0, &request.sock, sizeof request.sock) < 0) { + 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; +} + +void dump_device_stats(void) +{ + cp(); + + logger(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device); + logger(LOG_DEBUG, _(" total bytes in: %10d"), device_total_in); + logger(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out); +} -- 2.20.1