| 1 |
pcg |
1.1 |
/* |
| 2 |
|
|
device-linux.C -- Interaction with Linux tun/tap device |
| 3 |
|
|
|
| 4 |
|
|
This program is free software; you can redistribute it and/or modify |
| 5 |
|
|
it under the terms of the GNU General Public License as published by |
| 6 |
|
|
the Free Software Foundation; either version 2 of the License, or |
| 7 |
|
|
(at your option) any later version. |
| 8 |
|
|
|
| 9 |
|
|
This program is distributed in the hope that it will be useful, |
| 10 |
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 |
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 |
|
|
GNU General Public License for more details. |
| 13 |
|
|
|
| 14 |
|
|
You should have received a copy of the GNU General Public License |
| 15 |
|
|
along with this program; if not, write to the Free Software |
| 16 |
|
|
Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 17 |
|
|
*/ |
| 18 |
|
|
|
| 19 |
|
|
#include "config.h" |
| 20 |
|
|
|
| 21 |
|
|
#include <cstdio> |
| 22 |
|
|
#include <cstring> |
| 23 |
|
|
#include <cstdlib> |
| 24 |
|
|
|
| 25 |
|
|
#include <errno.h> |
| 26 |
|
|
#include <sys/types.h> |
| 27 |
|
|
#include <sys/stat.h> |
| 28 |
|
|
#include <fcntl.h> |
| 29 |
|
|
#include <net/if.h> |
| 30 |
|
|
#include <unistd.h> |
| 31 |
|
|
#include <sys/ioctl.h> |
| 32 |
|
|
|
| 33 |
|
|
#ifdef LINUX_IF_TUN_H |
| 34 |
|
|
#include LINUX_IF_TUN_H |
| 35 |
|
|
#else |
| 36 |
|
|
#include <linux/if_tun.h> |
| 37 |
|
|
#endif |
| 38 |
|
|
#define DEFAULT_DEVICE "/dev/net/tun" |
| 39 |
|
|
|
| 40 |
|
|
#include "gettext.h" |
| 41 |
|
|
|
| 42 |
|
|
#include "conf.h" |
| 43 |
|
|
|
| 44 |
|
|
tap_device::tap_device () |
| 45 |
|
|
{ |
| 46 |
|
|
struct ifreq ifr; |
| 47 |
|
|
|
| 48 |
|
|
device = DEFAULT_DEVICE; |
| 49 |
|
|
|
| 50 |
|
|
fd = open (device, O_RDWR); |
| 51 |
|
|
|
| 52 |
|
|
if (fd < 0) |
| 53 |
|
|
{ |
| 54 |
|
|
slog (L_ERR, _("could not open device %s: %s"), device, strerror (errno)); |
| 55 |
|
|
exit (1); |
| 56 |
|
|
} |
| 57 |
|
|
|
| 58 |
|
|
memset (&ifr, 0, sizeof (ifr)); |
| 59 |
|
|
ifr.ifr_flags = IFF_TAP | IFF_NO_PI; |
| 60 |
|
|
|
| 61 |
|
|
if (conf.ifname) |
| 62 |
|
|
strncpy (ifr.ifr_name, conf.ifname, IFNAMSIZ); |
| 63 |
|
|
else |
| 64 |
|
|
ifr.ifr_name[0] = 0; |
| 65 |
|
|
|
| 66 |
|
|
if (!ioctl (fd, TUNSETIFF, &ifr)) |
| 67 |
|
|
{ |
| 68 |
|
|
strncpy (ifrname, ifr.ifr_name, IFNAMSIZ); |
| 69 |
|
|
ifrname [IFNAMSIZ] = 0; |
| 70 |
|
|
} |
| 71 |
|
|
else |
| 72 |
|
|
{ |
| 73 |
|
|
slog (L_CRIT, _("unable to configure tun/tap interface: %s"), strerror (errno)); |
| 74 |
|
|
exit (1); |
| 75 |
|
|
} |
| 76 |
|
|
|
| 77 |
|
|
if (conf.ifpersist) |
| 78 |
|
|
if (ioctl (fd, TUNSETPERSIST, 1)) |
| 79 |
|
|
slog (L_WARN, _("cannot set persistent mode for device %s: %s"), ifrname, strerror (errno)); |
| 80 |
|
|
|
| 81 |
|
|
slog (L_DEBUG, _("%s is a %s"), device, info ()); |
| 82 |
|
|
} |
| 83 |
|
|
|
| 84 |
|
|
tap_device::~tap_device () |
| 85 |
|
|
{ |
| 86 |
|
|
close (fd); |
| 87 |
|
|
} |
| 88 |
|
|
|
| 89 |
|
|
tap_packet * |
| 90 |
|
|
tap_device::recv () |
| 91 |
|
|
{ |
| 92 |
|
|
tap_packet *pkt = new tap_packet; |
| 93 |
|
|
|
| 94 |
|
|
pkt->len = read (fd, &((*pkt)[0]), MAX_MTU); |
| 95 |
|
|
|
| 96 |
|
|
if (pkt->len <= 0) |
| 97 |
|
|
{ |
| 98 |
|
|
slog (L_ERR, _("error while reading from %s %s: %s"), |
| 99 |
|
|
info (), DEFAULT_DEVICE, strerror (errno)); |
| 100 |
|
|
free (pkt); |
| 101 |
|
|
return 0; |
| 102 |
|
|
} |
| 103 |
|
|
|
| 104 |
|
|
return pkt; |
| 105 |
|
|
} |
| 106 |
|
|
|
| 107 |
|
|
void |
| 108 |
|
|
tap_device::send (tap_packet *pkt) |
| 109 |
|
|
{ |
| 110 |
|
|
if (write (fd, &((*pkt)[0]), pkt->len) < 0) |
| 111 |
|
|
slog (L_ERR, _("can't write to %s %s: %s"), info (), DEFAULT_DEVICE, |
| 112 |
|
|
strerror (errno)); |
| 113 |
|
|
} |
| 114 |
|
|
|
