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/*
* Copyright (C) 2009 Red Hat, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "log.h"
#include "netlink.h"
#if defined(HAVE_LINUX_NETLINK_H) && defined(HAVE_LINUX_RTNETLINK_H)
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
int
cm_netlink_socket(void)
{
int fd;
struct sockaddr_nl sn;
fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
if (fd == -1) {
return -1;
}
if (fcntl(fd, F_SETFL, (long) O_NONBLOCK) == -1) {
close(fd);
return -1;
};
if (fcntl(fd, F_SETFD, (long) FD_CLOEXEC) == -1) {
close(fd);
return -1;
};
memset(&sn, 0, sizeof(sn));
sn.nl_family = AF_NETLINK;
sn.nl_pad = 0;
sn.nl_pid = getpid();
sn.nl_groups = RTMGRP_NOTIFY | RTMGRP_IPV4_ROUTE | RTMGRP_IPV6_ROUTE;
if (bind(fd, (struct sockaddr *) &sn, sizeof(sn)) == -1) {
close(fd);
return -1;
}
return fd;
}
int
cm_netlink_pkt_is_route_change(char *buf, int len,
struct sockaddr *src_addr, socklen_t addrlen)
{
struct nlmsghdr *nlmsg;
struct sockaddr_nl *src;
if (addrlen != sizeof(*src)) {
return -1;
}
src = (struct sockaddr_nl *) src_addr;
if (src->nl_pid != 0) {
return -1;
}
for (nlmsg = (struct nlmsghdr *) buf;
(len > 0) && NLMSG_OK(nlmsg, (unsigned int) len);
nlmsg = NLMSG_NEXT(nlmsg, len)) {
switch (nlmsg->nlmsg_type) {
case RTM_NEWLINK:
case RTM_DELLINK:
case RTM_NEWROUTE:
case RTM_DELROUTE:
return 0;
break;
}
}
return -1;
}
#else
int
cm_netlink_socket(void)
{
return -1;
}
int
cm_netlink_pkt_is_route_change(char *buf, int len,
struct sockaddr *src_addr, socklen_t addrlen)
{
return -1;
}
#endif
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