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/*
*
* AT chat library with GLib integration
*
* Copyright (C) 2008-2011 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 <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <linux/if_tun.h>
#include <glib.h>
#include "ringbuffer.h"
#include "gatrawip.h"
struct _GAtRawIP {
gint ref_count;
GAtIO *io;
GAtIO *tun_io;
char *ifname;
struct ring_buffer *write_buffer;
struct ring_buffer *tun_write_buffer;
GAtDebugFunc debugf;
gpointer debug_data;
};
GAtRawIP *g_at_rawip_new(GIOChannel *channel)
{
GAtRawIP *rawip;
GAtIO *io;
io = g_at_io_new(channel);
if (io == NULL)
return NULL;
rawip = g_at_rawip_new_from_io(io);
g_at_io_unref(io);
return rawip;
}
GAtRawIP *g_at_rawip_new_from_io(GAtIO *io)
{
GAtRawIP *rawip;
rawip = g_try_new0(GAtRawIP, 1);
if (rawip == NULL)
return NULL;
rawip->ref_count = 1;
rawip->write_buffer = NULL;
rawip->tun_write_buffer = NULL;
rawip->io = g_at_io_ref(io);
return rawip;
}
GAtRawIP *g_at_rawip_ref(GAtRawIP *rawip)
{
if (rawip == NULL)
return NULL;
g_atomic_int_inc(&rawip->ref_count);
return rawip;
}
void g_at_rawip_unref(GAtRawIP *rawip)
{
if (rawip == NULL)
return;
if (g_atomic_int_dec_and_test(&rawip->ref_count) == FALSE)
return;
g_at_rawip_shutdown(rawip);
g_at_io_unref(rawip->io);
rawip->io = NULL;
g_free(rawip->ifname);
rawip->ifname = NULL;
g_free(rawip);
}
static gboolean can_write_data(gpointer data)
{
GAtRawIP *rawip = data;
unsigned int len;
unsigned char *buf;
gsize bytes_written;
if (rawip->write_buffer == NULL)
return FALSE;
len = ring_buffer_len_no_wrap(rawip->write_buffer);
buf = ring_buffer_read_ptr(rawip->write_buffer, 0);
bytes_written = g_at_io_write(rawip->io, (gchar *) buf, len);
ring_buffer_drain(rawip->write_buffer, bytes_written);
if (ring_buffer_len(rawip->write_buffer) > 0)
return TRUE;
rawip->write_buffer = NULL;
return FALSE;
}
static gboolean tun_write_data(gpointer data)
{
GAtRawIP *rawip = data;
unsigned int len;
unsigned char *buf;
gsize bytes_written;
if (rawip->tun_write_buffer == NULL)
return FALSE;
len = ring_buffer_len_no_wrap(rawip->tun_write_buffer);
buf = ring_buffer_read_ptr(rawip->tun_write_buffer, 0);
bytes_written = g_at_io_write(rawip->tun_io, (gchar *) buf, len);
ring_buffer_drain(rawip->tun_write_buffer, bytes_written);
if (ring_buffer_len(rawip->tun_write_buffer) > 0)
return TRUE;
rawip->tun_write_buffer = NULL;
return FALSE;
}
static void new_bytes(struct ring_buffer *rbuf, gpointer user_data)
{
GAtRawIP *rawip = user_data;
rawip->tun_write_buffer = rbuf;
g_at_io_set_write_handler(rawip->tun_io, tun_write_data, rawip);
}
static void tun_bytes(struct ring_buffer *rbuf, gpointer user_data)
{
GAtRawIP *rawip = user_data;
rawip->write_buffer = rbuf;
g_at_io_set_write_handler(rawip->io, can_write_data, rawip);
}
static void create_tun(GAtRawIP *rawip)
{
GIOChannel *channel;
struct ifreq ifr;
int fd, err;
fd = open("/dev/net/tun", O_RDWR);
if (fd < 0)
return;
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
strcpy(ifr.ifr_name, "gprs%d");
err = ioctl(fd, TUNSETIFF, (void *) &ifr);
if (err < 0) {
close(fd);
return;
}
rawip->ifname = g_strdup(ifr.ifr_name);
channel = g_io_channel_unix_new(fd);
if (channel == NULL) {
close(fd);
return;
}
rawip->tun_io = g_at_io_new(channel);
g_io_channel_unref(channel);
}
void g_at_rawip_open(GAtRawIP *rawip)
{
if (rawip == NULL)
return;
create_tun(rawip);
if (rawip->tun_io == NULL)
return;
g_at_io_set_read_handler(rawip->io, new_bytes, rawip);
g_at_io_set_read_handler(rawip->tun_io, tun_bytes, rawip);
}
void g_at_rawip_shutdown(GAtRawIP *rawip)
{
if (rawip == NULL)
return;
if (rawip->tun_io == NULL)
return;
g_at_io_set_read_handler(rawip->io, NULL, NULL);
g_at_io_set_read_handler(rawip->tun_io, NULL, NULL);
rawip->write_buffer = NULL;
rawip->tun_write_buffer = NULL;
g_at_io_unref(rawip->tun_io);
rawip->tun_io = NULL;
}
const char *g_at_rawip_get_interface(GAtRawIP *rawip)
{
if (rawip == NULL)
return NULL;
return rawip->ifname;
}
void g_at_rawip_set_debug(GAtRawIP *rawip, GAtDebugFunc func,
gpointer user_data)
{
if (rawip == NULL)
return;
rawip->debugf = func;
rawip->debug_data = user_data;
}
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