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0bbc2c1f3b
For efficiency, we group bytes together before adding them up. This is guaranteed to always work (regardless of the byte order) as long as the i-th byte in each group lign up with the i-th byte in each other group. On big-endian machines this broke when handling the trailing few bytes which did not make up a full group of 4 bytes. This patch fixes the problem by explicitly creating a 4 byte zero-padded group out of the trailing bytes. Reported and tested by Thomas Ritter <th.ritter@gmx.at>.
60 lines
2.4 KiB
C
60 lines
2.4 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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#pragma once
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/***
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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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Copyright (C) 2014 Tom Gundersen
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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 <stdint.h>
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#include <linux/if_packet.h>
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#include "socket-util.h"
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#include "dhcp-protocol.h"
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int dhcp_network_bind_raw_socket(int index, union sockaddr_union *link, uint32_t xid);
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int dhcp_network_bind_udp_socket(be32_t address, uint16_t port);
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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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int dhcp_network_send_udp_socket(int s, be32_t address, uint16_t port,
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const void *packet, size_t len);
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int dhcp_option_append(DHCPMessage *message, size_t size, size_t *offset, uint8_t overload,
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uint8_t code, size_t optlen, const void *optval);
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typedef int (*dhcp_option_cb_t)(uint8_t code, uint8_t len,
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const uint8_t *option, void *user_data);
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int dhcp_option_parse(DHCPMessage *message, size_t len,
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dhcp_option_cb_t cb, void *user_data);
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int dhcp_message_init(DHCPMessage *message, uint8_t op, uint32_t xid, uint8_t type,
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size_t optlen, size_t *optoffset);
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uint16_t dhcp_packet_checksum(uint8_t *buf, size_t len);
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void dhcp_packet_append_ip_headers(DHCPPacket *packet, be32_t source_addr,
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uint16_t source, be32_t destination_addr,
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uint16_t destination, uint16_t len);
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int dhcp_packet_verify_headers(DHCPPacket *packet, size_t len, bool checksum);
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#define log_dhcp_client(client, fmt, ...) log_meta(LOG_DEBUG, __FILE__, __LINE__, __func__, "DHCP CLIENT (0x%x): " fmt, client->xid, ##__VA_ARGS__)
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