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/*
* This file is part of oFono - Open Source Telephony
*
* Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
*
* Contact: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
*
* 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 <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/socket.h>
#ifndef SOL_NETLINK
#define SOL_NETLINK 270 /* libc!? */
#endif
#ifndef AF_PHONET
#define AF_PHONET 35
#endif
#include <linux/rtnetlink.h>
#include <linux/phonet.h>
#include <glib.h>
#include "netlink.h"
struct _GPhonetNetlink {
GPhonetNetlinkFunc callback;
void *opaque;
guint watch;
};
/* Parser Netlink messages */
static gboolean g_pn_nl_process(GIOChannel *channel, GIOCondition cond,
gpointer data)
{
struct {
struct nlmsghdr nlh;
struct rtmsg rtm;
char buf[1024];
} req;
struct iovec iov = { &req, sizeof(req), };
struct msghdr msg = { .msg_iov = &iov, .msg_iovlen = 1, };
ssize_t ret;
struct nlmsghdr *nlh;
int fd = g_io_channel_unix_get_fd(channel);
GPhonetNetlink *self = data;
if (cond & (G_IO_NVAL|G_IO_HUP))
return FALSE;
ret = recvmsg(fd, &msg, 0);
if (ret == -1 || (msg.msg_flags & MSG_TRUNC))
return TRUE;
for (nlh = (struct nlmsghdr *)&req; NLMSG_OK(nlh, (size_t)ret);
nlh = NLMSG_NEXT(nlh, ret)) {
const struct ifaddrmsg *ifa;
const struct rtattr *rta;
int len;
bool up;
uint8_t addr = 0;
if (nlh->nlmsg_type == NLMSG_DONE)
break;
switch (nlh->nlmsg_type) {
case NLMSG_ERROR: {
const struct nlmsgerr *err;
err = (struct nlmsgerr *)NLMSG_DATA(nlh);
g_critical("Netlink error: %s", strerror(-err->error));
return FALSE;
}
case RTM_NEWADDR:
up = true;
break;
case RTM_DELADDR:
up = false;
break;
default:
continue;
}
/* We have a route message */
ifa = NLMSG_DATA(nlh);
len = RTM_PAYLOAD(nlh);
/* If Phonet is absent, kernel transmits other families... */
if (ifa->ifa_family != AF_PHONET)
continue;
for (rta = IFA_RTA(ifa); RTA_OK(rta, len);
rta = RTA_NEXT(rta, len))
if (rta->rta_type == IFA_LOCAL)
memcpy(&addr, RTA_DATA(rta), 1);
self->callback(up, addr, ifa->ifa_index, self->opaque);
}
return TRUE;
}
/* Dump current Phonet address table */
static int g_pn_netlink_query(int fd)
{
struct {
struct nlmsghdr nlh;
struct rtmsg rtm;
} req;
struct sockaddr_nl addr = { .nl_family = AF_NETLINK, };
req.nlh.nlmsg_type = RTM_GETADDR;
req.nlh.nlmsg_len = NLMSG_LENGTH(sizeof(req.rtm));
req.nlh.nlmsg_flags = NLM_F_REQUEST | NLM_F_ROOT;
req.nlh.nlmsg_seq = 0;
req.nlh.nlmsg_pid = getpid();
req.rtm.rtm_family = AF_PHONET;
req.rtm.rtm_dst_len = 6;
req.rtm.rtm_src_len = 0;
req.rtm.rtm_tos = 0;
req.rtm.rtm_table = RT_TABLE_MAIN;
req.rtm.rtm_protocol = RTPROT_STATIC;
req.rtm.rtm_scope = RT_SCOPE_UNIVERSE;
req.rtm.rtm_type = RTN_UNICAST;
req.rtm.rtm_flags = 0;
if (sendto(fd, &req, req.nlh.nlmsg_len, 0,
(struct sockaddr *)&addr, sizeof(addr)) == -1)
return -1;
return 0;
}
GPhonetNetlink *g_pn_netlink_start(GPhonetNetlinkFunc cb, void *opaque)
{
GIOChannel *chan;
GPhonetNetlink *self;
unsigned group = RTNLGRP_PHONET_IFADDR;
int fd;
self = malloc(sizeof(*self));
if (self == NULL)
return NULL;
fd = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
if (fd == -1)
goto error;
fcntl(fd, F_SETFL, O_NONBLOCK | fcntl(fd, F_GETFL));
if (setsockopt(fd, SOL_NETLINK, NETLINK_ADD_MEMBERSHIP,
&group, sizeof(group)))
goto error;
g_pn_netlink_query(fd);
chan = g_io_channel_unix_new(fd);
if (chan == NULL)
goto error;
g_io_channel_set_close_on_unref(chan, TRUE);
g_io_channel_set_encoding(chan, NULL, NULL);
g_io_channel_set_buffered(chan, FALSE);
self->callback = cb;
self->opaque = opaque;
self->watch = g_io_add_watch(chan, G_IO_IN|G_IO_ERR|G_IO_HUP,
g_pn_nl_process, self);
g_io_channel_unref(chan);
return self;
error:
if (fd != -1)
close(fd);
free(self);
return NULL;
}
void g_pn_netlink_stop(GPhonetNetlink *self)
{
g_source_remove(self->watch);
g_free(self);
}
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