| 1 |
/* |
| 2 |
device-tincd.C -- include one of the tincd low level implementations. |
| 3 |
Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de> |
| 4 |
|
| 5 |
This file is part of GVPE. |
| 6 |
|
| 7 |
GVPE is free software; you can redistribute it and/or modify |
| 8 |
it under the terms of the GNU General Public License as published by |
| 9 |
the Free Software Foundation; either version 2 of the License, or |
| 10 |
(at your option) any later version. |
| 11 |
|
| 12 |
This program is distributed in the hope that it will be useful, |
| 13 |
but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 |
GNU General Public License for more details. |
| 16 |
|
| 17 |
You should have received a copy of the GNU General Public License |
| 18 |
along with gvpe; if not, write to the Free Software |
| 19 |
Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 20 |
*/ |
| 21 |
|
| 22 |
#include <cstdio> |
| 23 |
#include <cstring> |
| 24 |
#include <cerrno> |
| 25 |
|
| 26 |
#include <sys/types.h> |
| 27 |
#include <sys/stat.h> |
| 28 |
#include <sys/ioctl.h> |
| 29 |
#include <unistd.h> |
| 30 |
#include <syslog.h> |
| 31 |
#include <fcntl.h> |
| 32 |
|
| 33 |
#include "conf.h" |
| 34 |
|
| 35 |
// following headers used by cygwin (maybe others) |
| 36 |
#include "netcompat.h" |
| 37 |
#include <signal.h> |
| 38 |
|
| 39 |
#define xstrdup(strd) strdup(str) |
| 40 |
|
| 41 |
/* make the tincd sources feel comfortable in our environment. */ |
| 42 |
/* this was reasonably easy to do. */ |
| 43 |
#define routing_mode 1 |
| 44 |
#define RMODE_ROUTER 0 |
| 45 |
|
| 46 |
#define LOG_TO_L(level) \ |
| 47 |
(level) == LOG_ERR ? L_ERR \ |
| 48 |
: (level) == LOG_DEBUG ? L_DEBUG \ |
| 49 |
: (level) == LOG_WARNING ? L_WARN \ |
| 50 |
: (level) == LOG_INFO ? L_INFO \ |
| 51 |
: L_NOTICE |
| 52 |
|
| 53 |
#if __STDC_VERSION__ > 199900 |
| 54 |
# define logger(level, ...) slog (LOG_TO_L(level), __VA_ARGS__) |
| 55 |
#elif __GNUC__ |
| 56 |
# define logger(level, args...) slog (LOG_TO_L(level), ## args) |
| 57 |
#else |
| 58 |
# error either need ISO-C 99 compliant compiler or gcc. |
| 59 |
#endif |
| 60 |
|
| 61 |
#define ifdebug(subsys) if (0) |
| 62 |
|
| 63 |
#define cp() |
| 64 |
#define lookup_config(config_tree,key) (key) |
| 65 |
|
| 66 |
#define MTU MAX_MTU |
| 67 |
|
| 68 |
// BIGGEST hack of 'em all |
| 69 |
// will be casted to data_packet, due to structural similarity |
| 70 |
struct vpn_packet_t : net_packet { |
| 71 |
u8 data[MAXSIZE]; |
| 72 |
}; |
| 73 |
|
| 74 |
static bool overwrite_mac; |
| 75 |
|
| 76 |
static bool |
| 77 |
get_config_string(const char *key, char **res) |
| 78 |
{ |
| 79 |
if (!strcmp (key, "Interface")) |
| 80 |
*res = conf.ifname; |
| 81 |
else if (!strcmp (key, "Device")) |
| 82 |
*res = 0; |
| 83 |
else |
| 84 |
{ |
| 85 |
slog (L_ERR, _("tincd layer asking for unknown config '%s'"), key); |
| 86 |
*res = 0; |
| 87 |
} |
| 88 |
|
| 89 |
return *res; |
| 90 |
} |
| 91 |
|
| 92 |
#define netname conf.ifname |
| 93 |
|
| 94 |
#if IF_linux |
| 95 |
# include "tincd/linux/device.c" |
| 96 |
const char * tap_device::if_up () { return "/sbin/ifconfig $IFNAME hw ether $MAC mtu $MTU up"; } |
| 97 |
|
| 98 |
#elif IF_freebsd |
| 99 |
# include "tincd/freebsd/device.c" |
| 100 |
// 5.2.1' ifconfig _first_ sets the if up then changes mtu, which can be deadly due to ipv6 kicking in |
| 101 |
const char * tap_device::if_up () { return "/sbin/ifconfig $IFNAME ether $MAC mtu $MTU && /sbin/ifconfig $IFNAME up"; } |
| 102 |
|
| 103 |
#elif IF_netbsd |
| 104 |
# define IF_istun 1 |
| 105 |
# include "tincd/netbsd/device.c" |
| 106 |
const char * tap_device::if_up () { return "/sbin/ifconfig $IFNAME mtu $MTU up"; } |
| 107 |
|
| 108 |
#elif IF_openbsd |
| 109 |
# define IF_istun 1 |
| 110 |
# include "tincd/openbsd/device.c" |
| 111 |
const char * tap_device::if_up () { return "/sbin/ifconfig $IFNAME mtu $MTU up"; } |
| 112 |
|
| 113 |
#elif IF_solaris |
| 114 |
# define IF_istun 1 |
| 115 |
# include "tincd/solaris/device.c" |
| 116 |
const char * tap_device::if_up () { return ""; } |
| 117 |
|
| 118 |
#elif IF_cygwin |
| 119 |
# include "tincd/cygwin/device.c" |
| 120 |
const char * tap_device::if_up () { return ""; } |
| 121 |
|
| 122 |
#elif IF_mingw |
| 123 |
# include "tincd/mingw/device.c" |
| 124 |
const char * tap_device::if_up () { return ""; } |
| 125 |
|
| 126 |
#elif IF_darwin |
| 127 |
# define IF_istun 1 |
| 128 |
# include "tincd/darwin/device.c" |
| 129 |
const char * tap_device::if_up () { return "/sbin/ifconfig $IFNAME ether $MAC mtu $MTU up"; } |
| 130 |
|
| 131 |
#elif IF_raw_socket |
| 132 |
# include "tincd/raw_socket/device.c" |
| 133 |
const char * tap_device::if_up () { return "/sbin/ifconfig $IFNAME ether $MAC mtu $MTU up"; } |
| 134 |
|
| 135 |
#elif IF_uml_socket |
| 136 |
# include "tincd/uml_socket/device.c" |
| 137 |
const char * tap_device::if_up () { return 0; } |
| 138 |
|
| 139 |
#else |
| 140 |
# error No interface implementation for your IFTYPE/IFSUBTYPE combination. |
| 141 |
#endif |
| 142 |
|
| 143 |
#if IF_istun |
| 144 |
# include "ether_emu.C" |
| 145 |
#endif |
| 146 |
|
| 147 |
const char * |
| 148 |
tap_device::info () |
| 149 |
{ |
| 150 |
return _("tincd compatibility layer"); |
| 151 |
} |
| 152 |
|
| 153 |
tap_device::tap_device () |
| 154 |
{ |
| 155 |
device = "(null)"; |
| 156 |
|
| 157 |
bool ok = setup_device (); |
| 158 |
|
| 159 |
if (device_info) |
| 160 |
device = device_info; |
| 161 |
|
| 162 |
if (ok) |
| 163 |
{ |
| 164 |
slog (L_DEBUG, _("interface %s on %s initialized"), info (), device); |
| 165 |
fd = device_fd; |
| 166 |
strcpy (ifrname, iface); |
| 167 |
} |
| 168 |
else |
| 169 |
{ |
| 170 |
slog (L_ERR, _("error while configuring tincd device %s on %s"), info (), device); |
| 171 |
exit (EXIT_FAILURE); |
| 172 |
} |
| 173 |
} |
| 174 |
|
| 175 |
tap_device::~tap_device () |
| 176 |
{ |
| 177 |
close_device (); |
| 178 |
} |
| 179 |
|
| 180 |
tap_packet * |
| 181 |
tap_device::recv () |
| 182 |
{ |
| 183 |
tap_packet *pkt = new tap_packet; |
| 184 |
|
| 185 |
if (!read_packet (reinterpret_cast<vpn_packet_t *>(pkt))) |
| 186 |
{ |
| 187 |
delete pkt; |
| 188 |
slog (L_ERR, _("can't read from to %s %s: %s"), info (), device, |
| 189 |
strerror (errno)); |
| 190 |
return 0; |
| 191 |
} |
| 192 |
|
| 193 |
#if IF_istun |
| 194 |
// assume ipv4 |
| 195 |
(*pkt)[12] = 0x08; |
| 196 |
(*pkt)[13] = 0x00; |
| 197 |
|
| 198 |
if (!ether_emu.tun_to_tap (pkt)) |
| 199 |
{ |
| 200 |
delete pkt; |
| 201 |
return 0; |
| 202 |
} |
| 203 |
#endif |
| 204 |
|
| 205 |
return pkt; |
| 206 |
} |
| 207 |
|
| 208 |
void |
| 209 |
tap_device::send (tap_packet *pkt) |
| 210 |
{ |
| 211 |
if ( |
| 212 |
#if IF_istun |
| 213 |
ether_emu.tap_to_tun (pkt) && |
| 214 |
#endif |
| 215 |
!write_packet (reinterpret_cast<vpn_packet_t *>(pkt))) |
| 216 |
slog (L_ERR, _("can't write to %s %s: %s"), info (), device, |
| 217 |
strerror (errno)); |
| 218 |
} |
| 219 |
|
| 220 |
|
