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Diffstat (limited to 'libnetutils/dhcpmsg.h')
-rw-r--r-- | libnetutils/dhcpmsg.h | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/libnetutils/dhcpmsg.h b/libnetutils/dhcpmsg.h new file mode 100644 index 0000000..c86e400 --- /dev/null +++ b/libnetutils/dhcpmsg.h @@ -0,0 +1,106 @@ +/* + * Copyright 2008, The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#ifndef _WIFI_DHCP_H_ +#define _WIFI_DHCP_H_ + +#include <sys/types.h> + +#define PORT_BOOTP_SERVER 67 +#define PORT_BOOTP_CLIENT 68 + +/* RFC 2131 p 9 */ +typedef struct dhcp_msg dhcp_msg; + +#define OP_BOOTREQUEST 1 +#define OP_BOOTREPLY 2 + +#define FLAGS_BROADCAST 0x8000 + +#define HTYPE_ETHER 1 + +struct dhcp_msg +{ + uint8_t op; /* BOOTREQUEST / BOOTREPLY */ + uint8_t htype; /* hw addr type */ + uint8_t hlen; /* hw addr len */ + uint8_t hops; /* client set to 0 */ + + uint32_t xid; /* transaction id */ + + uint16_t secs; /* seconds since start of acq */ + uint16_t flags; + + uint32_t ciaddr; /* client IP addr */ + uint32_t yiaddr; /* your (client) IP addr */ + uint32_t siaddr; /* ip addr of next server */ + /* (DHCPOFFER and DHCPACK) */ + uint32_t giaddr; /* relay agent IP addr */ + + uint8_t chaddr[16]; /* client hw addr */ + char sname[64]; /* asciiz server hostname */ + char file[128]; /* asciiz boot file name */ + + uint8_t options[1024]; /* optional parameters */ +}; + +#define DHCP_MSG_FIXED_SIZE 236 + +/* first four bytes of options are a cookie to indicate that +** the payload are DHCP options as opposed to some other BOOTP +** extension. +*/ +#define OPT_COOKIE1 0x63 +#define OPT_COOKIE2 0x82 +#define OPT_COOKIE3 0x53 +#define OPT_COOKIE4 0x63 + +/* BOOTP/DHCP options - see RFC 2132 */ +#define OPT_PAD 0 + +#define OPT_SUBNET_MASK 1 /* 4 <ipaddr> */ +#define OPT_TIME_OFFSET 2 /* 4 <seconds> */ +#define OPT_GATEWAY 3 /* 4*n <ipaddr> * n */ +#define OPT_DNS 6 /* 4*n <ipaddr> * n */ +#define OPT_DOMAIN_NAME 15 /* n <domainnamestring> */ +#define OPT_BROADCAST_ADDR 28 /* 4 <ipaddr> */ + +#define OPT_REQUESTED_IP 50 /* 4 <ipaddr> */ +#define OPT_LEASE_TIME 51 /* 4 <seconds> */ +#define OPT_MESSAGE_TYPE 53 /* 1 <msgtype> */ +#define OPT_SERVER_ID 54 /* 4 <ipaddr> */ +#define OPT_PARAMETER_LIST 55 /* n <optcode> * n */ +#define OPT_MESSAGE 56 /* n <errorstring> */ +#define OPT_CLASS_ID 60 /* n <opaque> */ +#define OPT_CLIENT_ID 61 /* n <opaque> */ +#define OPT_END 255 + +/* DHCP message types */ +#define DHCPDISCOVER 1 +#define DHCPOFFER 2 +#define DHCPREQUEST 3 +#define DHCPDECLINE 4 +#define DHCPACK 5 +#define DHCPNAK 6 +#define DHCPRELEASE 7 +#define DHCPINFORM 8 + +int init_dhcp_discover_msg(dhcp_msg *msg, void *hwaddr, uint32_t xid); + +int init_dhcp_request_msg(dhcp_msg *msg, void *hwaddr, uint32_t xid, + uint32_t ipaddr, uint32_t serveraddr); + +#endif |