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101 lines
2.2 KiB
101 lines
2.2 KiB
4 months ago
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/*
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* Copyright 2008, The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdio.h>
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#include <stdarg.h>
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#include <string.h>
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#include <netinet/in.h>
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#include "dhcpmsg.h"
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static void *init_dhcp_msg(dhcp_msg *msg, int type, void *hwaddr, uint32_t xid)
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{
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uint8_t *x;
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memset(msg, 0, sizeof(dhcp_msg));
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msg->op = OP_BOOTREQUEST;
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msg->htype = HTYPE_ETHER;
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msg->hlen = 6;
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msg->hops = 0;
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msg->flags = htons(FLAGS_BROADCAST);
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msg->xid = xid;
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memcpy(msg->chaddr, hwaddr, 6);
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x = msg->options;
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*x++ = OPT_COOKIE1;
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*x++ = OPT_COOKIE2;
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*x++ = OPT_COOKIE3;
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*x++ = OPT_COOKIE4;
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*x++ = OPT_MESSAGE_TYPE;
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*x++ = 1;
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*x++ = type;
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return x;
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}
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int init_dhcp_discover_msg(dhcp_msg *msg, void *hwaddr, uint32_t xid)
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{
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uint8_t *x;
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x = init_dhcp_msg(msg, DHCPDISCOVER, hwaddr, xid);
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*x++ = OPT_PARAMETER_LIST;
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*x++ = 4;
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*x++ = OPT_SUBNET_MASK;
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*x++ = OPT_GATEWAY;
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*x++ = OPT_DNS;
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*x++ = OPT_BROADCAST_ADDR;
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*x++ = OPT_END;
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return DHCP_MSG_FIXED_SIZE + (x - msg->options);
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}
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int init_dhcp_request_msg(dhcp_msg *msg, void *hwaddr, uint32_t xid,
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uint32_t ipaddr, uint32_t serveraddr)
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{
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uint8_t *x;
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x = init_dhcp_msg(msg, DHCPREQUEST, hwaddr, xid);
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*x++ = OPT_PARAMETER_LIST;
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*x++ = 4;
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*x++ = OPT_SUBNET_MASK;
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*x++ = OPT_GATEWAY;
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*x++ = OPT_DNS;
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*x++ = OPT_BROADCAST_ADDR;
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*x++ = OPT_REQUESTED_IP;
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*x++ = 4;
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memcpy(x, &ipaddr, 4);
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x += 4;
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*x++ = OPT_SERVER_ID;
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*x++ = 4;
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memcpy(x, &serveraddr, 4);
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x += 4;
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*x++ = OPT_END;
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return DHCP_MSG_FIXED_SIZE + (x - msg->options);
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}
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