| /* |
| * dhcpcd - DHCP client daemon |
| * Copyright (c) 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 <arpa/inet.h> |
| #include <netinet/in.h> |
| |
| #include <stdint.h> |
| |
| #include "common.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 |
| |
| /* Constants taken from RFC 2131. */ |
| #define T1 0.5 |
| #define T2 0.875 |
| #define DHCP_BASE 4 |
| #define DHCP_MAX 64 |
| #define DHCP_RAND_MIN -1 |
| #define DHCP_RAND_MAX 1 |
| #define DHCP_ARP_FAIL 10 |
| |
| /* number of usecs in a second. */ |
| #define USECS_SECOND 1000000 |
| /* As we use timevals, we should use the usec part for |
| * greater randomisation. */ |
| #define DHCP_RAND_MIN_U DHCP_RAND_MIN * USECS_SECOND |
| #define DHCP_RAND_MAX_U DHCP_RAND_MAX * USECS_SECOND |
| #define PROBE_MIN_U PROBE_MIN * USECS_SECOND |
| #define PROBE_MAX_U PROBE_MAX * USECS_SECOND |
| |
| /* DHCP options */ |
| enum DHO { |
| DHO_PAD = 0, |
| DHO_SUBNETMASK = 1, |
| DHO_ROUTER = 3, |
| DHO_DNSSERVER = 6, |
| DHO_HOSTNAME = 12, |
| DHO_DNSDOMAIN = 15, |
| DHO_MTU = 26, |
| DHO_BROADCAST = 28, |
| DHO_STATICROUTE = 33, |
| DHO_NISDOMAIN = 40, |
| DHO_NISSERVER = 41, |
| DHO_NTPSERVER = 42, |
| DHO_VENDOR = 43, |
| DHO_IPADDRESS = 50, |
| DHO_LEASETIME = 51, |
| DHO_OPTIONSOVERLOADED = 52, |
| DHO_MESSAGETYPE = 53, |
| DHO_SERVERID = 54, |
| DHO_PARAMETERREQUESTLIST = 55, |
| DHO_MESSAGE = 56, |
| DHO_MAXMESSAGESIZE = 57, |
| DHO_RENEWALTIME = 58, |
| DHO_REBINDTIME = 59, |
| DHO_VENDORCLASSID = 60, |
| DHO_CLIENTID = 61, |
| DHO_USERCLASS = 77, /* RFC 3004 */ |
| DHO_FQDN = 81, |
| DHO_DNSSEARCH = 119, /* RFC 3397 */ |
| DHO_CSR = 121, /* RFC 3442 */ |
| DHO_MSCSR = 249, /* MS code for RFC 3442 */ |
| DHO_END = 255 |
| }; |
| |
| /* FQDN values - lsnybble used in flags |
| * hsnybble to create order |
| * and to allow 0x00 to mean disable |
| */ |
| enum FQDN { |
| FQDN_DISABLE = 0x00, |
| FQDN_NONE = 0x18, |
| FQDN_PTR = 0x20, |
| FQDN_BOTH = 0x31 |
| }; |
| |
| /* Sizes for DHCP options */ |
| #define DHCP_CHADDR_LEN 16 |
| #define SERVERNAME_LEN 64 |
| #define BOOTFILE_LEN 128 |
| #define DHCP_UDP_LEN (14 + 20 + 8) |
| #define DHCP_FIXED_LEN (DHCP_UDP_LEN + 226) |
| #define DHCP_OPTION_LEN (MTU_MAX - DHCP_FIXED_LEN) |
| |
| /* Some crappy DHCP servers require the BOOTP minimum length */ |
| #define BOOTP_MESSAGE_LENTH_MIN 300 |
| |
| struct dhcp_message { |
| uint8_t op; /* message type */ |
| uint8_t hwtype; /* hardware address type */ |
| uint8_t hwlen; /* hardware address length */ |
| uint8_t 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 */ |
| uint8_t chaddr[DHCP_CHADDR_LEN]; /* client's hardware address */ |
| uint8_t servername[SERVERNAME_LEN]; /* server host name */ |
| uint8_t bootfile[BOOTFILE_LEN]; /* boot file name */ |
| uint32_t cookie; |
| uint8_t options[DHCP_OPTION_LEN]; /* message options - cookie */ |
| } _packed; |
| |
| struct dhcp_lease { |
| struct in_addr addr; |
| struct in_addr net; |
| struct in_addr brd; |
| uint32_t leasetime; |
| uint32_t renewaltime; |
| uint32_t rebindtime; |
| struct in_addr server; |
| time_t leasedfrom; |
| struct timeval boundtime; |
| uint8_t frominfo; |
| uint32_t cookie; |
| }; |
| |
| #include "dhcpcd.h" |
| #include "if-options.h" |
| #include "net.h" |
| |
| #define add_option_mask(var, val) (var[val >> 3] |= 1 << (val & 7)) |
| #define del_option_mask(var, val) (var[val >> 3] &= ~(1 << (val & 7))) |
| #define has_option_mask(var, val) (var[val >> 3] & (1 << (val & 7))) |
| int make_option_mask(uint8_t *, const char *, int); |
| void print_options(void); |
| char *get_option_string(const struct dhcp_message *, uint8_t); |
| int get_option_addr(struct in_addr *, const struct dhcp_message *, uint8_t); |
| int get_option_uint32(uint32_t *, const struct dhcp_message *, uint8_t); |
| int get_option_uint16(uint16_t *, const struct dhcp_message *, uint8_t); |
| int get_option_uint8(uint8_t *, const struct dhcp_message *, uint8_t); |
| #define is_bootp(m) (m && \ |
| !IN_LINKLOCAL(htonl((m)->yiaddr)) && \ |
| get_option_uint8(NULL, m, DHO_MESSAGETYPE) == -1) |
| struct rt *get_option_routes(const struct dhcp_message *, const char *, int *); |
| ssize_t configure_env(char **, const char *, const struct dhcp_message *, |
| const struct if_options *); |
| |
| int dhcp_message_add_addr(struct dhcp_message *, uint8_t, struct in_addr); |
| ssize_t make_message(struct dhcp_message **, const struct interface *, |
| uint8_t); |
| int valid_dhcp_packet(unsigned char *); |
| |
| ssize_t write_lease(const struct interface *, const struct dhcp_message *); |
| struct dhcp_message *read_lease(const struct interface *); |
| void get_lease(struct dhcp_lease *, const struct dhcp_message *); |
| |
| #endif |
