diff options
Diffstat (limited to 'dhcp.h')
| -rw-r--r-- | dhcp.h | 65 |
1 files changed, 44 insertions, 21 deletions
@@ -1,6 +1,6 @@ /* * dhcpcd - DHCP client daemon - * Copyright 2006-2008 Roy Marples <roy@marples.name> + * Copyright (c) 2006-2008 Roy Marples <roy@marples.name> * All rights reserved * Redistribution and use in source and binary forms, with or without @@ -29,12 +29,11 @@ #define DHCP_H #include <arpa/inet.h> +#include <netinet/in.h> #include <stdint.h> -#include "config.h" -#include "dhcpcd.h" -#include "net.h" +#include "common.h" /* Max MTU - defines dhcp option length */ #define MTU_MAX 1500 @@ -61,9 +60,26 @@ #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 -{ +enum DHO { DHO_PAD = 0, DHO_SUBNETMASK = 1, DHO_ROUTER = 3, @@ -112,13 +128,9 @@ enum FQDN { #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) +#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 @@ -140,11 +152,12 @@ struct dhcp_message { 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; @@ -152,27 +165,37 @@ struct dhcp_lease { 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 *, char **, int); +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); -struct rt *get_option_routes(const struct dhcp_message *); +#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 options *); + const struct if_options *); -ssize_t make_message(struct dhcp_message **, - const struct interface *, const struct dhcp_lease *, - uint32_t, uint8_t, const struct 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 *iface); +struct dhcp_message *read_lease(const struct interface *); +void get_lease(struct dhcp_lease *, const struct dhcp_message *); + #endif |