ofono/gisi/socket.c

/*
 *
 *  oFono - Open Source Telephony
 *
 *  Copyright (C) 2009-2010 Nokia Corporation and/or its subsidiary(-ies).
 *
 *  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 <stdint.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <net/if.h>
#include <fcntl.h>
#include "modem.h"
#include "phonet.h"
#include <glib.h>

#include "socket.h"

GIOChannel *phonet_new(GIsiModem *modem, uint8_t resource)
{
	GIOChannel *channel;
	struct sockaddr_pn addr = {
		.spn_family = AF_PHONET,
		.spn_resource = resource,
	};
	unsigned ifi = g_isi_modem_index(modem);
	char buf[IF_NAMESIZE];

	int fd = socket(PF_PHONET, SOCK_DGRAM, 0);
	if (fd == -1)
		return NULL;
	fcntl(fd, F_SETFD, FD_CLOEXEC);
	/* Use blocking mode on purpose. */

	if (ifi == 0)
		g_warning("Unspecified GIsiModem!");
	else if (if_indextoname(ifi, buf) == NULL ||
		setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, buf, IF_NAMESIZE))
		goto error;
	if (bind(fd, (void *)&addr, sizeof(addr)))
		goto error;

	channel = g_io_channel_unix_new(fd);
	g_io_channel_set_close_on_unref(channel, TRUE);
	g_io_channel_set_encoding(channel, NULL, NULL);
	g_io_channel_set_buffered(channel, FALSE);
	return channel;
error:
	close(fd);
	return NULL;
}

size_t phonet_peek_length(GIOChannel *channel)
{
	int len;
	int fd = g_io_channel_unix_get_fd(channel);
	return ioctl(fd, FIONREAD, &len) ? 0 : len;
}

ssize_t phonet_read(GIOChannel *channel, void *restrict buf, size_t len,
			uint16_t *restrict obj, uint8_t *restrict res)
{
	struct sockaddr_pn addr;
	socklen_t addrlen = sizeof(addr);
	ssize_t ret;

	ret = recvfrom(g_io_channel_unix_get_fd(channel), buf, len,
			MSG_DONTWAIT, (void *)&addr, &addrlen);
	if (ret == -1)
		return -1;

	if (obj != NULL)
		*obj = (addr.spn_dev << 8) | addr.spn_obj;
	if (res != NULL)
		*res = addr.spn_resource;
	return ret;
}