| 1 |
/* |
| 2 |
device.c -- raw socket |
| 3 |
Copyright (C) 2002-2004 Ivo Timmermans <ivo@tinc-vpn.org>, |
| 4 |
2002-2004 Guus Sliepen <guus@tinc-vpn.org> |
| 5 |
|
| 6 |
This program is free software; you can redistribute it and/or modify |
| 7 |
it under the terms of the GNU General Public License as published by |
| 8 |
the Free Software Foundation; either version 2 of the License, or |
| 9 |
(at your option) any later version. |
| 10 |
|
| 11 |
This program is distributed in the hope that it will be useful, |
| 12 |
but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 |
GNU General Public License for more details. |
| 15 |
|
| 16 |
You should have received a copy of the GNU General Public License |
| 17 |
along with this program; if not, write to the Free Software |
| 18 |
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 19 |
|
| 20 |
$Id: device.c 1405 2004-11-08 22:11:33Z guus $ |
| 21 |
*/ |
| 22 |
|
| 23 |
#include <netpacket/packet.h> |
| 24 |
#include <netinet/ether.h> |
| 25 |
|
| 26 |
int device_fd = -1; |
| 27 |
char *device; |
| 28 |
char *iface; |
| 29 |
char ifrname[IFNAMSIZ]; |
| 30 |
char *device_info; |
| 31 |
|
| 32 |
static int device_total_in = 0; |
| 33 |
static int device_total_out = 0; |
| 34 |
|
| 35 |
bool setup_device(void) |
| 36 |
{ |
| 37 |
struct ifreq ifr; |
| 38 |
struct sockaddr_ll sa; |
| 39 |
|
| 40 |
cp(); |
| 41 |
|
| 42 |
if(!get_config_string |
| 43 |
(lookup_config(config_tree, "Interface"), &iface)) |
| 44 |
iface = "eth0"; |
| 45 |
|
| 46 |
if(!get_config_string(lookup_config(config_tree, "Device"), &device)) |
| 47 |
device = iface; |
| 48 |
|
| 49 |
device_info = _("raw socket"); |
| 50 |
|
| 51 |
if((device_fd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL))) < 0) { |
| 52 |
logger(LOG_ERR, _("Could not open %s: %s"), device_info, |
| 53 |
strerror(errno)); |
| 54 |
return false; |
| 55 |
} |
| 56 |
|
| 57 |
memset(&ifr, 0, sizeof(ifr)); |
| 58 |
strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ); |
| 59 |
if(ioctl(device_fd, SIOCGIFINDEX, &ifr)) { |
| 60 |
close(device_fd); |
| 61 |
logger(LOG_ERR, _("Can't find interface %s: %s"), iface, |
| 62 |
strerror(errno)); |
| 63 |
return false; |
| 64 |
} |
| 65 |
|
| 66 |
memset(&sa, '0', sizeof(sa)); |
| 67 |
sa.sll_family = AF_PACKET; |
| 68 |
sa.sll_protocol = htons(ETH_P_ALL); |
| 69 |
sa.sll_ifindex = ifr.ifr_ifindex; |
| 70 |
|
| 71 |
if(bind(device_fd, (struct sockaddr *) &sa, (socklen_t) sizeof(sa))) { |
| 72 |
logger(LOG_ERR, _("Could not bind %s to %s: %s"), device, iface, strerror(errno)); |
| 73 |
return false; |
| 74 |
} |
| 75 |
|
| 76 |
logger(LOG_INFO, _("%s is a %s"), device, device_info); |
| 77 |
|
| 78 |
return true; |
| 79 |
} |
| 80 |
|
| 81 |
void close_device(void) |
| 82 |
{ |
| 83 |
cp(); |
| 84 |
|
| 85 |
close(device_fd); |
| 86 |
} |
| 87 |
|
| 88 |
bool read_packet(vpn_packet_t *packet) |
| 89 |
{ |
| 90 |
int lenin; |
| 91 |
|
| 92 |
cp(); |
| 93 |
|
| 94 |
if((lenin = read(device_fd, packet->data, MTU)) <= 0) { |
| 95 |
logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info, |
| 96 |
device, strerror(errno)); |
| 97 |
return false; |
| 98 |
} |
| 99 |
|
| 100 |
packet->len = lenin; |
| 101 |
|
| 102 |
device_total_in += packet->len; |
| 103 |
|
| 104 |
ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Read packet of %d bytes from %s"), packet->len, |
| 105 |
device_info); |
| 106 |
|
| 107 |
return true; |
| 108 |
} |
| 109 |
|
| 110 |
bool write_packet(vpn_packet_t *packet) |
| 111 |
{ |
| 112 |
cp(); |
| 113 |
|
| 114 |
ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Writing packet of %d bytes to %s"), |
| 115 |
packet->len, device_info); |
| 116 |
|
| 117 |
if(write(device_fd, packet->data, packet->len) < 0) { |
| 118 |
logger(LOG_ERR, _("Can't write to %s %s: %s"), device_info, device, |
| 119 |
strerror(errno)); |
| 120 |
return false; |
| 121 |
} |
| 122 |
|
| 123 |
device_total_out += packet->len; |
| 124 |
|
| 125 |
return true; |
| 126 |
} |
| 127 |
|
| 128 |
void dump_device_stats(void) |
| 129 |
{ |
| 130 |
cp(); |
| 131 |
|
| 132 |
logger(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device); |
| 133 |
logger(LOG_DEBUG, _(" total bytes in: %10d"), device_total_in); |
| 134 |
logger(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out); |
| 135 |
} |
