tinc/src/solaris/device.c

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/*
device.c -- Interaction with Solaris tun device
Copyright (C) 2001-2005 Ivo Timmermans,
2001-2011 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.
*/
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#include "system.h"
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#include <sys/stropts.h>
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#include <sys/sockio.h>
#include <net/if_tun.h>
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#include "conf.h"
#include "device.h"
#include "logger.h"
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#include "net.h"
#include "utils.h"
#include "xalloc.h"
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#define DEFAULT_DEVICE "/dev/tun"
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int device_fd = -1;
static int ip_fd = -1, if_fd = -1;
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char *device = NULL;
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char *iface = NULL;
static char *device_info = NULL;
static uint64_t device_total_in = 0;
static uint64_t device_total_out = 0;
static bool setup_device(void) {
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int ppa;
char *ptr;
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if(!get_config_string(lookup_config(config_tree, "Device"), &device))
device = xstrdup(DEFAULT_DEVICE);
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if((device_fd = open(device, O_RDWR | O_NONBLOCK)) < 0) {
logger(LOG_ERR, "Could not open %s: %s", device, strerror(errno));
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return false;
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}
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ppa = 0;
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ptr = device;
while(*ptr && !isdigit((int) *ptr))
ptr++;
ppa = atoi(ptr);
if((ip_fd = open("/dev/ip", O_RDWR, 0)) < 0) {
logger(LOG_ERR, "Could not open /dev/ip: %s", strerror(errno));
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return false;
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}
/* Assign a new PPA and get its unit number. */
if((ppa = ioctl(device_fd, TUNNEWPPA, ppa)) < 0) {
logger(LOG_ERR, "Can't assign new interface: %s", strerror(errno));
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return false;
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}
if((if_fd = open(device, O_RDWR, 0)) < 0) {
logger(LOG_ERR, "Could not open %s twice: %s", device,
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strerror(errno));
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return false;
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}
if(ioctl(if_fd, I_PUSH, "ip") < 0) {
logger(LOG_ERR, "Can't push IP module: %s", strerror(errno));
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return false;
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}
/* Assign ppa according to the unit number returned by tun device */
if(ioctl(if_fd, IF_UNITSEL, (char *) &ppa) < 0) {
logger(LOG_ERR, "Can't set PPA %d: %s", ppa, strerror(errno));
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return false;
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}
if(ioctl(ip_fd, I_LINK, if_fd) < 0) {
logger(LOG_ERR, "Can't link TUN device to IP: %s", strerror(errno));
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return false;
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}
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if(!get_config_string(lookup_config(config_tree, "Interface"), &iface))
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xasprintf(&iface, "tun%d", ppa);
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device_info = "Solaris tun device";
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logger(LOG_INFO, "%s is a %s", device, device_info);
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return true;
}
static void close_device(void) {
close(if_fd);
close(ip_fd);
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close(device_fd);
free(device);
free(iface);
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}
static bool read_packet(vpn_packet_t *packet) {
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int lenin;
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if((lenin = read(device_fd, packet->data + 14, MTU - 14)) <= 0) {
logger(LOG_ERR, "Error while reading from %s %s: %s", device_info,
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device, strerror(errno));
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return false;
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}
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switch(packet->data[14] >> 4) {
case 4:
packet->data[12] = 0x08;
packet->data[13] = 0x00;
break;
case 6:
packet->data[12] = 0x86;
packet->data[13] = 0xDD;
break;
default:
ifdebug(TRAFFIC) logger(LOG_ERR,
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"Unknown IP version %d while reading packet from %s %s",
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packet->data[14] >> 4, device_info, device);
return false;
}
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packet->len = lenin + 14;
device_total_in += packet->len;
ifdebug(TRAFFIC) logger(LOG_DEBUG, "Read packet of %d bytes from %s", packet->len,
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device_info);
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return true;
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}
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static bool write_packet(vpn_packet_t *packet) {
ifdebug(TRAFFIC) logger(LOG_DEBUG, "Writing packet of %d bytes to %s",
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packet->len, device_info);
if(write(device_fd, packet->data + 14, packet->len - 14) < 0) {
logger(LOG_ERR, "Can't write to %s %s: %s", device_info,
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device, strerror(errno));
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return false;
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}
device_total_out += packet->len;
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return true;
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}
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);
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}
const devops_t os_devops = {
.setup = setup_device,
.close = close_device,
.read = read_packet,
.write = write_packet,
.dump_stats = dump_device_stats,
};