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Diffstat (limited to 'src/customdhcpcd/dhcp.h')
| -rw-r--r-- | src/customdhcpcd/dhcp.h | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/src/customdhcpcd/dhcp.h b/src/customdhcpcd/dhcp.h new file mode 100644 index 0000000..ef97b75 --- /dev/null +++ b/src/customdhcpcd/dhcp.h @@ -0,0 +1,215 @@ +/* + * dhcpcd - DHCP client daemon + * Copyright 2006-2008 Roy Marples <roy@marples.name> + * 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 <netinet/in_systm.h> +#include <netinet/in.h> +#include <netinet/ip.h> +#include <netinet/udp.h> +#include <stdint.h> + +#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 |