mirror of git://git.sysmocom.de/ofono
260 lines
4.9 KiB
C
260 lines
4.9 KiB
C
/*
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*
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* AT chat library with GLib integration
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*
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* Copyright (C) 2008-2010 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <net/if.h>
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#include <linux/if_tun.h>
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#include <glib.h>
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#include "ringbuffer.h"
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#include "gatrawip.h"
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struct _GAtRawIP {
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gint ref_count;
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GAtIO *io;
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GAtIO *tun_io;
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char *ifname;
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struct ring_buffer *write_buffer;
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struct ring_buffer *tun_write_buffer;
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GAtDebugFunc debugf;
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gpointer debug_data;
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};
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GAtRawIP *g_at_rawip_new(GIOChannel *channel)
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{
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GAtRawIP *rawip;
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GAtIO *io;
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io = g_at_io_new(channel);
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if (io == NULL)
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return NULL;
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rawip = g_at_rawip_new_from_io(io);
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g_at_io_unref(io);
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return rawip;
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}
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GAtRawIP *g_at_rawip_new_from_io(GAtIO *io)
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{
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GAtRawIP *rawip;
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rawip = g_try_new0(GAtRawIP, 1);
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if (rawip == NULL)
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return NULL;
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rawip->ref_count = 1;
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rawip->write_buffer = NULL;
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rawip->tun_write_buffer = NULL;
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rawip->io = g_at_io_ref(io);
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return rawip;
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}
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GAtRawIP *g_at_rawip_ref(GAtRawIP *rawip)
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{
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if (rawip == NULL)
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return NULL;
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g_atomic_int_inc(&rawip->ref_count);
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return rawip;
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}
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void g_at_rawip_unref(GAtRawIP *rawip)
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{
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if (rawip == NULL)
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return;
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if (g_atomic_int_dec_and_test(&rawip->ref_count) == FALSE)
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return;
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g_at_rawip_shutdown(rawip);
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g_at_io_unref(rawip->io);
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rawip->io = NULL;
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g_free(rawip->ifname);
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rawip->ifname = NULL;
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g_free(rawip);
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}
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static gboolean can_write_data(gpointer data)
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{
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GAtRawIP *rawip = data;
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unsigned int len;
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unsigned char *buf;
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gsize bytes_written;
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if (rawip->write_buffer == NULL)
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return FALSE;
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len = ring_buffer_len_no_wrap(rawip->write_buffer);
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buf = ring_buffer_read_ptr(rawip->write_buffer, 0);
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bytes_written = g_at_io_write(rawip->io, (gchar *) buf, len);
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ring_buffer_drain(rawip->write_buffer, bytes_written);
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if (ring_buffer_len(rawip->write_buffer) > 0)
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return TRUE;
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rawip->write_buffer = NULL;
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return FALSE;
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}
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static gboolean tun_write_data(gpointer data)
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{
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GAtRawIP *rawip = data;
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unsigned int len;
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unsigned char *buf;
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gsize bytes_written;
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if (rawip->tun_write_buffer == NULL)
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return FALSE;
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len = ring_buffer_len_no_wrap(rawip->tun_write_buffer);
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buf = ring_buffer_read_ptr(rawip->tun_write_buffer, 0);
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bytes_written = g_at_io_write(rawip->tun_io, (gchar *) buf, len);
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ring_buffer_drain(rawip->tun_write_buffer, bytes_written);
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if (ring_buffer_len(rawip->tun_write_buffer) > 0)
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return TRUE;
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rawip->tun_write_buffer = NULL;
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return FALSE;
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}
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static void new_bytes(struct ring_buffer *rbuf, gpointer user_data)
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{
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GAtRawIP *rawip = user_data;
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rawip->tun_write_buffer = rbuf;
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g_at_io_set_write_handler(rawip->tun_io, tun_write_data, rawip);
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}
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static void tun_bytes(struct ring_buffer *rbuf, gpointer user_data)
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{
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GAtRawIP *rawip = user_data;
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rawip->write_buffer = rbuf;
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g_at_io_set_write_handler(rawip->io, can_write_data, rawip);
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}
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static void create_tun(GAtRawIP *rawip)
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{
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GIOChannel *channel;
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struct ifreq ifr;
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int fd, err;
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fd = open("/dev/net/tun", O_RDWR);
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if (fd < 0)
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return;
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memset(&ifr, 0, sizeof(ifr));
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ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
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strcpy(ifr.ifr_name, "gprs%d");
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err = ioctl(fd, TUNSETIFF, (void *) &ifr);
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if (err < 0) {
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close(fd);
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return;
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}
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rawip->ifname = g_strdup(ifr.ifr_name);
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channel = g_io_channel_unix_new(fd);
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if (channel == NULL) {
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close(fd);
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return;
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}
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rawip->tun_io = g_at_io_new(channel);
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g_io_channel_unref(channel);
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}
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void g_at_rawip_open(GAtRawIP *rawip)
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{
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if (rawip == NULL)
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return;
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create_tun(rawip);
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if (rawip->tun_io == NULL)
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return;
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g_at_io_set_read_handler(rawip->io, new_bytes, rawip);
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g_at_io_set_read_handler(rawip->tun_io, tun_bytes, rawip);
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}
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void g_at_rawip_shutdown(GAtRawIP *rawip)
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{
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if (rawip == NULL)
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return;
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if (rawip->tun_io == NULL)
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return;
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g_at_io_set_read_handler(rawip->io, NULL, NULL);
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g_at_io_set_read_handler(rawip->tun_io, NULL, NULL);
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rawip->write_buffer = NULL;
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rawip->tun_write_buffer = NULL;
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g_at_io_unref(rawip->tun_io);
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rawip->tun_io = NULL;
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}
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const char *g_at_rawip_get_interface(GAtRawIP *rawip)
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{
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if (rawip == NULL)
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return NULL;
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return rawip->ifname;
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}
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void g_at_rawip_set_debug(GAtRawIP *rawip, GAtDebugFunc func,
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gpointer user_data)
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{
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if (rawip == NULL)
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return;
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rawip->debugf = func;
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rawip->debug_data = user_data;
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}
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