/* * dhcpcd - DHCP client daemon * Copyright (c) 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 "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