/* * dhcpcd - DHCP client daemon * Copyright 2006-2008 Roy Marples * All rights reserved * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef DHCP_H #define DHCP_H #include #include #include #include #include #include "dhcpcd.h" #include "interface.h" /* Max MTU - defines dhcp option length */ #define MTU_MAX 1500 #define MTU_MIN 576 /* UDP port numbers for DHCP */ #define DHCP_SERVER_PORT 67 #define DHCP_CLIENT_PORT 68 #define MAGIC_COOKIE 0x63825363 #define BROADCAST_FLAG 0x8000 /* DHCP message OP code */ #define DHCP_BOOTREQUEST 1 #define DHCP_BOOTREPLY 2 /* DHCP message type */ #define DHCP_DISCOVER 1 #define DHCP_OFFER 2 #define DHCP_REQUEST 3 #define DHCP_DECLINE 4 #define DHCP_ACK 5 #define DHCP_NAK 6 #define DHCP_RELEASE 7 #define DHCP_INFORM 8 /* DHCP options */ enum DHCP_OPTIONS { DHCP_PAD = 0, DHCP_NETMASK = 1, DHCP_TIMEROFFSET = 2, DHCP_ROUTERS = 3, DHCP_TIMESERVER = 4, DHCP_NAMESERVER = 5, DHCP_DNSSERVER = 6, DHCP_LOGSERVER = 7, DHCP_COOKIESERVER = 8, DHCP_HOSTNAME = 12, DHCP_DNSDOMAIN = 15, DHCP_ROOTPATH = 17, DHCP_DEFAULTIPTTL = 23, DHCP_MTU = 26, DHCP_BROADCAST = 28, DHCP_MASKDISCOVERY = 29, DHCP_ROUTERDISCOVERY = 31, DHCP_STATICROUTE = 33, DHCP_NISDOMAIN = 40, DHCP_NISSERVER = 41, DHCP_NTPSERVER = 42, DHCP_ADDRESS = 50, DHCP_LEASETIME = 51, DHCP_OPTIONSOVERLOADED = 52, DHCP_MESSAGETYPE = 53, DHCP_SERVERIDENTIFIER = 54, DHCP_PARAMETERREQUESTLIST = 55, DHCP_MESSAGE = 56, DHCP_MAXMESSAGESIZE = 57, DHCP_RENEWALTIME = 58, DHCP_REBINDTIME = 59, DHCP_CLASSID = 60, DHCP_CLIENTID = 61, DHCP_USERCLASS = 77, /* RFC 3004 */ DHCP_FQDN = 81, DHCP_DNSSEARCH = 119, /* RFC 3397 */ DHCP_SIPSERVER = 120, /* RFC 3361 */ DHCP_CSR = 121, /* RFC 3442 */ DHCP_MSCSR = 249, /* MS code for RFC 3442 */ DHCP_END = 255 }; /* SetFQDNHostName values - lsnybble used in flags * byte (see buildmsg.c), hsnybble to create order * and to allow 0x00 to mean disable */ enum FQQN { FQDN_DISABLE = 0x00, FQDN_NONE = 0x18, FQDN_PTR = 0x20, FQDN_BOTH = 0x31 }; typedef struct fqdn_t { uint8_t flags; uint8_t r1; uint8_t r2; char *name; } fqdn_t; typedef struct dhcp_t { char version[11]; struct in_addr serveraddress; char serverhw[IF_NAMESIZE]; char servername[64]; struct in_addr address; struct in_addr netmask; struct in_addr broadcast; unsigned short mtu; uint32_t leasedfrom; uint32_t leasetime; uint32_t renewaltime; uint32_t rebindtime; struct route_head *routes; char *hostname; fqdn_t *fqdn; struct address_head *dnsservers; char *dnsdomain; char *dnssearch; struct address_head *ntpservers; struct address_head *nisservers; char *nisdomain; char *sipservers; char *message; char *rootpath; bool frominfo; } dhcp_t; /* Sizes for DHCP options */ #define DHCP_CHADDR_LEN 16 #define SERVERNAME_LEN 64 #define BOOTFILE_LEN 128 #define DHCP_UDP_LEN (20 + 8) #define DHCP_BASE_LEN (4 + 4 + 2 + 2 + 4 + 4 + 4 + 4 + 4) #define DHCP_RESERVE_LEN (4 + 4 + 4 + 4 + 2) #define DHCP_FIXED_LEN (DHCP_BASE_LEN + DHCP_CHADDR_LEN + \ + SERVERNAME_LEN + BOOTFILE_LEN) #define DHCP_OPTION_LEN (MTU_MAX - DHCP_FIXED_LEN - DHCP_UDP_LEN \ - DHCP_RESERVE_LEN) /* Some crappy DHCP servers require the BOOTP minimum length */ #define BOOTP_MESSAGE_LENTH_MIN 300 typedef struct dhcpmessage_t { unsigned char op; /* message type */ unsigned char hwtype; /* hardware address type */ unsigned char hwlen; /* hardware address length */ unsigned char hwopcount; /* should be zero in client message */ uint32_t xid; /* transaction id */ uint16_t secs; /* elapsed time in sec. from boot */ uint16_t flags; uint32_t ciaddr; /* (previously allocated) client IP */ uint32_t yiaddr; /* 'your' client IP address */ uint32_t siaddr; /* should be zero in client's messages */ uint32_t giaddr; /* should be zero in client's messages */ unsigned char chaddr[DHCP_CHADDR_LEN]; /* client's hardware address */ unsigned char servername[SERVERNAME_LEN]; /* server host name */ unsigned char bootfile[BOOTFILE_LEN]; /* boot file name */ uint32_t cookie; unsigned char options[DHCP_OPTION_LEN]; /* message options - cookie */ } dhcpmessage_t; struct udp_dhcp_packet { struct ip ip; struct udphdr udp; dhcpmessage_t dhcp; }; ssize_t send_message (const interface_t *iface, const dhcp_t *dhcp, uint32_t xid, char type, const options_t *options); void free_dhcp (dhcp_t *dhcp); int parse_dhcpmessage (dhcp_t *dhcp, const dhcpmessage_t *message); #endif