diff options
Diffstat (limited to 'src/libsystemd-dhcp/dhcp-packet.c')
| -rw-r--r-- | src/libsystemd-dhcp/dhcp-packet.c | 190 |
1 files changed, 0 insertions, 190 deletions
diff --git a/src/libsystemd-dhcp/dhcp-packet.c b/src/libsystemd-dhcp/dhcp-packet.c deleted file mode 100644 index 8388e56222..0000000000 --- a/src/libsystemd-dhcp/dhcp-packet.c +++ /dev/null @@ -1,190 +0,0 @@ -/*** - This file is part of systemd. - - Copyright (C) 2013 Intel Corporation. All rights reserved. - Copyright (C) 2014 Tom Gundersen - - 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 <stdlib.h> -#include <errno.h> -#include <string.h> -#include <stdio.h> -#include <net/ethernet.h> -#include <net/if_arp.h> -#include <sys/param.h> - -#include "util.h" -#include "list.h" - -#include "dhcp-protocol.h" -#include "dhcp-lease.h" -#include "dhcp-internal.h" -#include "sd-dhcp-client.h" - -#define DHCP_CLIENT_MIN_OPTIONS_SIZE 312 - -int dhcp_message_init(DHCPMessage *message, uint8_t op, uint32_t xid, - uint8_t type, uint8_t **opt, size_t *optlen) { - int err; - - assert(op == BOOTREQUEST || op == BOOTREPLY); - - *opt = (uint8_t *)(message + 1); - - if (*optlen < 4) - return -ENOBUFS; - *optlen -= 4; - - message->op = op; - message->htype = ARPHRD_ETHER; - message->hlen = ETHER_ADDR_LEN; - message->xid = htobe32(xid); - - (*opt)[0] = 0x63; - (*opt)[1] = 0x82; - (*opt)[2] = 0x53; - (*opt)[3] = 0x63; - - *opt += 4; - - err = dhcp_option_append(opt, optlen, DHCP_OPTION_MESSAGE_TYPE, 1, - &type); - if (err < 0) - return err; - - return 0; -} - -static uint16_t dhcp_checksum(void *buf, int len) { - uint32_t sum; - uint16_t *check; - int i; - uint8_t *odd; - - sum = 0; - check = buf; - - for (i = 0; i < len / 2 ; i++) - sum += check[i]; - - if (len & 0x01) { - odd = buf; - sum += odd[len - 1]; - } - - while (sum >> 16) - sum = (sum & 0xffff) + (sum >> 16); - - return ~sum; -} - -void dhcp_packet_append_ip_headers(DHCPPacket *packet, uint16_t len) { - packet->ip.version = IPVERSION; - packet->ip.ihl = DHCP_IP_SIZE / 4; - packet->ip.tot_len = htobe16(len); - - packet->ip.protocol = IPPROTO_UDP; - packet->ip.saddr = INADDR_ANY; - packet->ip.daddr = INADDR_BROADCAST; - - packet->udp.source = htobe16(DHCP_PORT_CLIENT); - packet->udp.dest = htobe16(DHCP_PORT_SERVER); - - packet->udp.len = htobe16(len - DHCP_IP_SIZE); - - packet->ip.check = packet->udp.len; - packet->udp.check = dhcp_checksum(&packet->ip.ttl, len - 8); - - packet->ip.ttl = IPDEFTTL; - packet->ip.check = 0; - packet->ip.check = dhcp_checksum(&packet->ip, DHCP_IP_SIZE); -} - -int dhcp_packet_verify_headers(DHCPPacket *packet, size_t len, bool checksum) { - size_t hdrlen; - - assert(packet); - - /* IP */ - - if (len < DHCP_IP_SIZE) { - log_dhcp_client(client, "ignoring packet: packet (%zu bytes) " - " smaller than IP header (%u bytes)", len, - DHCP_IP_SIZE); - return -EINVAL; - } - - if (packet->ip.ihl < 5) { - log_dhcp_client(client, "ignoring packet: IPv4 IHL (%u words) invalid", - packet->ip.ihl); - return -EINVAL; - } - - hdrlen = packet->ip.ihl * 4; - if (hdrlen < 20) { - log_dhcp_client(client, "ignoring packet: IPv4 IHL (%zu bytes) " - "smaller than minimum (20 bytes)", hdrlen); - return -EINVAL; - } - - if (len < hdrlen) { - log_dhcp_client(client, "ignoring packet: packet (%zu bytes) " - "smaller than expected (%zu) by IP header", len, - hdrlen); - return -EINVAL; - } - - if (dhcp_checksum(&packet->ip, hdrlen)) { - log_dhcp_client(client, "ignoring packet: invalid IP checksum"); - return -EINVAL; - } - - /* UDP */ - - if (len < DHCP_IP_UDP_SIZE) { - log_dhcp_client(client, "ignoring packet: packet (%zu bytes) " - " smaller than IP+UDP header (%u bytes)", len, - DHCP_IP_UDP_SIZE); - return -EINVAL; - } - - if (len < hdrlen + be16toh(packet->udp.len)) { - log_dhcp_client(client, "ignoring packet: packet (%zu bytes) " - "smaller than expected (%zu) by UDP header", len, - hdrlen + be16toh(packet->udp.len)); - return -EINVAL; - } - - if (checksum && packet->udp.check) { - packet->ip.check = packet->udp.len; - packet->ip.ttl = 0; - - if (dhcp_checksum(&packet->ip.ttl, - be16toh(packet->udp.len) + 12)) { - log_dhcp_client(client, "ignoring packet: invalid UDP checksum"); - return -EINVAL; - } - } - - if (be16toh(packet->udp.dest) != DHCP_PORT_CLIENT) { - log_dhcp_client(client, "ignoring packet: to port %u, which " - "is not the DHCP client port (%u)", - be16toh(packet->udp.dest), DHCP_PORT_CLIENT); - return -EINVAL; - } - - return 0; -} |