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100 lines
2.2 KiB
100 lines
2.2 KiB
/* |
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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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