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/*
*
* PPP library with GLib integration
*
* Copyright (C) 2009-2010 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <net/if.h>
#include <linux/if_tun.h>
#include <sys/ioctl.h>
#include <arpa/inet.h>
#include <glib.h>
#include "gatutil.h"
#include "gatppp.h"
#include "ppp.h"
/* XXX should be maximum IP Packet size */
#define MAX_PACKET 1500
void ppp_net_process_packet(struct ppp_net_data *data, guint8 *packet)
{
GError *error = NULL;
GIOStatus status;
gsize bytes_written;
guint16 len;
/*
* since ppp_net_open can fail, we need to make sure
* channel is valid
*/
if (data->channel == NULL)
return;
/* find the length of the packet to transmit */
len = get_host_short(&packet[2]);
status = g_io_channel_write_chars(data->channel, (gchar *) packet,
len, &bytes_written, &error);
}
/*
* packets received by the tun interface need to be written to
* the modem. So, just read a packet, write out to the modem
*
* TBD - how do we know we have a full packet? Do we care?
*/
static gboolean ppp_net_callback(GIOChannel *channel, GIOCondition cond,
gpointer userdata)
{
GIOStatus status;
gchar buf[MAX_PACKET + 2];
gsize bytes_read;
GError *error = NULL;
struct ppp_header *ppp = (struct ppp_header *) buf;
struct ppp_net_data *data = (struct ppp_net_data *) userdata;
if (cond & G_IO_IN) {
/* leave space to add PPP protocol field */
status = g_io_channel_read_chars(channel, buf + 2, MAX_PACKET,
&bytes_read, &error);
if (bytes_read > 0) {
ppp->proto = htons(PPP_IP_PROTO);
ppp_transmit(data->ppp, (guint8 *) buf, bytes_read);
}
if (status != G_IO_STATUS_NORMAL && status != G_IO_STATUS_AGAIN)
return FALSE;
}
return TRUE;
}
void ppp_net_close(struct ppp_net_data *data)
{
/* Not Implemented Yet */
}
void ppp_net_open(struct ppp_net_data *data)
{
int fd;
struct ifreq ifr;
GIOChannel *channel;
int signal_source;
int err;
if (data == NULL)
return;
/* open a tun interface */
fd = open("/dev/net/tun", O_RDWR);
if (fd < 0) {
g_printerr("error opening tun\n");
return;
}
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
strcpy(ifr.ifr_name, "ppp%d");
err = ioctl(fd, TUNSETIFF, (void *)&ifr);
if (err < 0) {
g_printerr("error %d setting ifr\n", err);
close(fd);
return;
}
data->if_name = strdup(ifr.ifr_name);
/* create a channel for reading and writing to this interface */
channel = g_io_channel_unix_new(fd);
if (!channel) {
g_printerr("Error creating I/O Channel to TUN device\n");
close(fd);
return;
}
if (!g_at_util_setup_io(channel, G_IO_FLAG_NONBLOCK)) {
g_io_channel_unref(channel);
return;
}
data->channel = channel;
g_io_channel_set_buffered(channel, FALSE);
signal_source = g_io_add_watch(channel,
G_IO_IN | G_IO_HUP | G_IO_ERR | G_IO_NVAL,
ppp_net_callback, (gpointer) data);
}
struct ppp_net_data *ppp_net_new(GAtPPP *ppp)
{
struct ppp_net_data *data;
data = g_try_malloc0(sizeof(*data));
if (!data)
return NULL;
data->ppp = ppp;
return data;
}
void ppp_net_free(struct ppp_net_data *data)
{
/* TBD unregister packet handler */
/* cleanup tun interface */
ppp_net_close(data);
/* free self */
g_free(data);
}
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