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/***
This file is part of systemd.
Copyright (C) 2013 Intel Corporation. All rights reserved.
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <string.h>
#include <linux/if_packet.h>
#include <net/ethernet.h>
#include <stdio.h>
#include <unistd.h>
#include "socket-util.h"
#include "dhcp-internal.h"
int dhcp_network_bind_raw_socket(int index, union sockaddr_union *link)
{
int s;
s = socket(AF_PACKET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
htons(ETH_P_IP));
if (s < 0)
return -errno;
link->ll.sll_family = AF_PACKET;
link->ll.sll_protocol = htons(ETH_P_IP);
link->ll.sll_ifindex = index;
link->ll.sll_halen = ETH_ALEN;
memset(link->ll.sll_addr, 0xff, ETH_ALEN);
if (bind(s, &link->sa, sizeof(link->ll)) < 0) {
close_nointr_nofail(s);
return -errno;
}
return s;
}
int dhcp_network_bind_udp_socket(int index, be32_t client_address)
{
int s;
union sockaddr_union src = {
.in.sin_family = AF_INET,
.in.sin_port = htobe16(DHCP_PORT_CLIENT),
.in.sin_addr.s_addr = client_address,
};
s = socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0);
if (s < 0)
return -errno;
if (bind(s, &src.sa, sizeof(src.in)) < 0) {
close_nointr_nofail(s);
return -errno;
}
return s;
}
int dhcp_network_send_raw_socket(int s, const union sockaddr_union *link,
const void *packet, size_t len)
{
if (sendto(s, packet, len, 0, &link->sa, sizeof(link->ll)) < 0)
return -errno;
return 0;
}
int dhcp_network_send_udp_socket(int s, be32_t server_address,
const void *packet, size_t len)
{
union sockaddr_union dest = {
.in.sin_family = AF_INET,
.in.sin_port = htobe16(DHCP_PORT_SERVER),
.in.sin_addr.s_addr = server_address,
};
if (sendto(s, packet, len, 0, &dest.sa, sizeof(dest.in)) < 0)
return -errno;
return 0;
}
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