mirror of git://git.sysmocom.de/ofono
168 lines
3.9 KiB
C
168 lines
3.9 KiB
C
/*
|
|
*
|
|
* 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
|
|
*/
|
|
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_NVAL | G_IO_ERR | G_IO_HUP))
|
|
return FALSE;
|
|
|
|
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)
|
|
{
|
|
g_source_remove(data->watch);
|
|
g_io_channel_unref(data->channel);
|
|
}
|
|
|
|
void ppp_net_open(struct ppp_net_data *data)
|
|
{
|
|
int fd;
|
|
struct ifreq ifr;
|
|
GIOChannel *channel;
|
|
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);
|
|
data->watch = 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)
|
|
{
|
|
/* cleanup tun interface */
|
|
ppp_net_close(data);
|
|
|
|
/* free self */
|
|
g_free(data);
|
|
}
|