8c00042c93
Create a function for handling the full IP, UDP and DHCP packet and tie it to the main loop. Verify IP and UDP headers and checksum. Creat a new lease structure with using the values supplied in the DHCP message. Free the lease structure when client is stopped. Split out socket handling into a creation and a sending part. As a result modify the test code.
66 lines
1.8 KiB
C
66 lines
1.8 KiB
C
/***
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This file is part of systemd.
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Copyright (C) 2013 Intel Corporation. All rights reserved.
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <string.h>
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#include <linux/if_packet.h>
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#include <net/ethernet.h>
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#include <stdio.h>
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#include <unistd.h>
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#include "socket-util.h"
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#include "dhcp-internal.h"
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int dhcp_network_bind_raw_socket(int index, union sockaddr_union *link)
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{
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int s;
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s = socket(AF_PACKET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
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htons(ETH_P_IP));
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if (s < 0)
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return -errno;
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link->ll.sll_family = AF_PACKET;
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link->ll.sll_protocol = htons(ETH_P_IP);
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link->ll.sll_ifindex = index;
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link->ll.sll_halen = ETH_ALEN;
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memset(link->ll.sll_addr, 0xff, ETH_ALEN);
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if (bind(s, &link->sa, sizeof(link->ll)) < 0) {
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close(s);
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return -errno;
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}
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return s;
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}
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int dhcp_network_send_raw_socket(int s, const union sockaddr_union *link,
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const void *packet, size_t len)
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{
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int err = 0;
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if (sendto(s, packet, len, 0, &link->sa, sizeof(link->ll)) < 0)
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err = -errno;
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return err;
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}
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