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* dhcpcd - DHCP client daemon -
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* Copyright (C) 1996 - 1997 Yoichi Hariguchi <yoichi@fore.com>
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* Copyright (C) January, 1998 Sergei Viznyuk <sv@phystech.com>
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* Copyright (C) 2005 Roy Marples <uberlord@gentoo.org>
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* Copyright (C) 2005 Simon Kelley <simon@thekelleys.org.uk>
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* dhcpcd is an RFC2131 and RFC1541 compliant DHCP client daemon.
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* This is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program 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.
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* See the GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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#include <net/ethernet.h>
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#include <linux/types.h>
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#include <linux/if_tr.h>
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#include <linux/if_ether.h>
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#define ETHERTYPE_IP 0x0800
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#define ETHERTYPE_ARP 0x0806
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#define IPPACKET_SIZE 1500
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#define MAGIC_COOKIE 0x63825363
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#define BROADCAST_FLAG 0x8000
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#define MAC_BCAST_ADDR "\xff\xff\xff\xff\xff\xff"
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#define AF_PACKET 17 /* should have been in socketbits.h */
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#define CLASS_ID_MAX_LEN 48
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#define CLIENT_ID_MAX_LEN 48
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#define HOSTNAME_MAX_LEN 64
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#define HWADDR_TRIES 3
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/* UDP port numbers for DHCP */
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#define DHCP_SERVER_PORT 67 /* from client to server */
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#define DHCP_CLIENT_PORT 68 /* from server to client */
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/* DHCP message OP code */
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#define DHCP_BOOTREQUEST 1
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#define DHCP_BOOTREPLY 2
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/* DHCP message type */
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#define DHCP_DISCOVER 1
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#define DHCP_REQUEST 3
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#define DHCP_DECLINE 4
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#define DHCP_RELEASE 7
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/* DHCP RETRANSMISSION TIMEOUT (microseconds) */
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#define DHCP_INITIAL_RTO (4*1000000)
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#define DHCP_MAX_RTO (64*1000000)
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/* DHCP option and value (cf. RFC1533) */
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resourceLocationServer = 11,
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nonLocalSourceRouting = 20,
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maxDgramReasmSize = 22,
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pathMTUagingTimeout = 24,
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pathMTUplateauTable = 25,
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allSubnetsLocal = 27,
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performMaskDiscovery = 29,
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performRouterDiscovery = 31,
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routerSolicitationAddr = 32,
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trailerEncapsulation = 34,
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arpCacheTimeout = 35,
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ethernetEncapsulation = 36,
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tcpKeepaliveInterval = 38,
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tcpKeepaliveGarbage = 39,
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vendorSpecificInfo = 43,
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netBIOSnameServer = 44,
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netBIOSdgramDistServer = 45,
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netBIOSnodeType = 46,
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xDisplayManager = 49,
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dhcpRequestedIPaddr = 50,
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dhcpIPaddrLeaseTime = 51,
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dhcpOptionOverload = 52,
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dhcpMessageType = 53,
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dhcpServerIdentifier = 54,
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dhcpParamRequest = 55,
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dhcpClassIdentifier = 60,
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dhcpClientIdentifier = 61,
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dhcpFQDNHostName = 81,
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dnsSearchPath = 119, /* RFC 3397 */
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/* SetFQDNHostName values - lsnybble used in flags
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* byte (see buildmsg.c), hsnybble to create order
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* and to allow 0x00 to mean disable
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typedef struct dhcpInterface
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unsigned char version[11];
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unsigned char shaddr[ETH_ALEN];
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unsigned char class_id[CLASS_ID_MAX_LEN];
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unsigned char client_id[CLIENT_ID_MAX_LEN];
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unsigned char chaddr[ETH_ALEN];
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typedef struct dhcpMessage
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u_char op; /* message type */
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u_char htype; /* hardware address type */
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u_char hlen; /* hardware address length */
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u_char hops; /* should be zero in client's message */
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u_int xid; /* transaction id */
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u_short secs; /* elapsed time in sec. from trying to boot */
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u_int ciaddr; /* (previously allocated) client IP address */
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u_int yiaddr; /* 'your' client IP address */
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u_int siaddr; /* should be zero in client's messages */
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u_int giaddr; /* should be zero in client's messages */
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u_char chaddr[16]; /* client's hardware address */
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u_char sname[64]; /* server host name, null terminated string */
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u_char file[128]; /* boot file name, null terminated string */
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u_char options[312]; /* message options */
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} __attribute__((packed)) dhcpMessage;
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struct packed_ether_header {
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u_int8_t ether_dhost[ETH_ALEN]; /* destination eth addr */
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u_int8_t ether_shost[ETH_ALEN]; /* source ether addr */
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u_int16_t ether_type; /* packet type ID field */
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} __attribute__((packed));
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typedef struct udpipMessage
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struct packed_ether_header ethhdr;
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char udpipmsg[IPPACKET_SIZE];
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char pad_for_tokenring_header[sizeof(struct trh_hdr) + sizeof(struct trllc)];
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} __attribute__((packed)) udpipMessage;
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typedef struct dhcpOptions
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} __attribute__((packed)) dhcpOptions;
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int peekfd(int s,int tv_usec);
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void *dhcpRequest(unsigned xid,void (*buildDhcpMsg)(unsigned));
added
removed
src/client.h
