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    Contents of /trunk/mkinitrd-magellan/busybox/networking/udhcp/dhcpd.h

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    Revision 1123 - (show annotations) (download)
    Wed Aug 18 21:56:57 2010 UTC (13 years, 9 months ago) by niro
    File MIME type: text/plain
    File size: 4841 byte(s) 
    -updated to busybox-1.17.1
    1 /* vi: set sw=4 ts=4: */
    2 /*
    3 * Licensed under GPLv2, see file LICENSE in this tarball for details.
    4 */
    5 #ifndef UDHCP_DHCPD_H
    6 #define UDHCP_DHCPD_H 1
    7
    8 PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
    9
    10 /* Defaults you may want to tweak */
    11 /* Default max_lease_sec */
    12 #define DEFAULT_LEASE_TIME (60*60*24 * 10)
    13 #define LEASES_FILE CONFIG_DHCPD_LEASES_FILE
    14 /* Where to find the DHCP server configuration file */
    15 #define DHCPD_CONF_FILE "/etc/udhcpd.conf"
    16
    17
    18 struct static_lease {
    19 struct static_lease *next;
    20 uint32_t nip;
    21 uint8_t mac[6];
    22 };
    23
    24 struct server_config_t {
    25 char *interface; /* interface to use */
    26 //TODO: ifindex, server_nip, server_mac
    27 // are obtained from interface name.
    28 // Instead of querying them *once*, create update_server_network_data_cache()
    29 // and call it before any usage of these fields.
    30 // update_server_network_data_cache() must re-query data
    31 // if more than N seconds have passed after last use.
    32 int ifindex;
    33 uint32_t server_nip;
    34 #if ENABLE_FEATURE_UDHCP_PORT
    35 uint16_t port;
    36 #endif
    37 uint8_t server_mac[6]; /* our MAC address (used only for ARP probing) */
    38 struct option_set *options; /* list of DHCP options loaded from the config file */
    39 /* start,end are in host order: we need to compare start <= ip <= end */
    40 uint32_t start_ip; /* start address of leases, in host order */
    41 uint32_t end_ip; /* end of leases, in host order */
    42 uint32_t max_lease_sec; /* maximum lease time (host order) */
    43 uint32_t min_lease_sec; /* minimum lease time a client can request */
    44 uint32_t max_leases; /* maximum number of leases (including reserved addresses) */
    45 uint32_t auto_time; /* how long should udhcpd wait before writing a config file.
    46 * if this is zero, it will only write one on SIGUSR1 */
    47 uint32_t decline_time; /* how long an address is reserved if a client returns a
    48 * decline message */
    49 uint32_t conflict_time; /* how long an arp conflict offender is leased for */
    50 uint32_t offer_time; /* how long an offered address is reserved */
    51 uint32_t siaddr_nip; /* "next server" bootp option */
    52 char *lease_file;
    53 char *pidfile;
    54 char *notify_file; /* what to run whenever leases are written */
    55 char *sname; /* bootp server name */
    56 char *boot_file; /* bootp boot file option */
    57 struct static_lease *static_leases; /* List of ip/mac pairs to assign static leases */
    58 } FIX_ALIASING;
    59
    60 #define server_config (*(struct server_config_t*)&bb_common_bufsiz1)
    61 /* client_config sits in 2nd half of bb_common_bufsiz1 */
    62
    63 #if ENABLE_FEATURE_UDHCP_PORT
    64 #define SERVER_PORT (server_config.port)
    65 #else
    66 #define SERVER_PORT 67
    67 #endif
    68
    69
    70 typedef uint32_t leasetime_t;
    71 typedef int32_t signed_leasetime_t;
    72
    73 struct dyn_lease {
    74 /* Unix time when lease expires. Kept in memory in host order.
    75 * When written to file, converted to network order
    76 * and adjusted (current time subtracted) */
    77 leasetime_t expires;
    78 /* "nip": IP in network order */
    79 uint32_t lease_nip;
    80 /* We use lease_mac[6], since e.g. ARP probing uses
    81 * only 6 first bytes anyway. We check received dhcp packets
    82 * that their hlen == 6 and thus chaddr has only 6 significant bytes
    83 * (dhcp packet has chaddr[16], not [6])
    84 */
    85 uint8_t lease_mac[6];
    86 char hostname[20];
    87 uint8_t pad[2];
    88 /* total size is a multiply of 4 */
    89 } PACKED;
    90
    91 extern struct dyn_lease *g_leases;
    92
    93 struct dyn_lease *add_lease(
    94 const uint8_t *chaddr, uint32_t yiaddr,
    95 leasetime_t leasetime,
    96 const char *hostname, int hostname_len
    97 ) FAST_FUNC;
    98 int is_expired_lease(struct dyn_lease *lease) FAST_FUNC;
    99 struct dyn_lease *find_lease_by_mac(const uint8_t *mac) FAST_FUNC;
    100 struct dyn_lease *find_lease_by_nip(uint32_t nip) FAST_FUNC;
    101 uint32_t find_free_or_expired_nip(const uint8_t *safe_mac) FAST_FUNC;
    102
    103
    104 /* Config file parser will pass static lease info to this function
    105 * which will add it to a data structure that can be searched later */
    106 void add_static_lease(struct static_lease **st_lease_pp, uint8_t *mac, uint32_t nip) FAST_FUNC;
    107 /* Find static lease IP by mac */
    108 uint32_t get_static_nip_by_mac(struct static_lease *st_lease, void *arg) FAST_FUNC;
    109 /* Check to see if an IP is reserved as a static IP */
    110 int is_nip_reserved(struct static_lease *st_lease, uint32_t nip) FAST_FUNC;
    111 /* Print out static leases just to check what's going on (debug code) */
    112 #if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 2
    113 void log_static_leases(struct static_lease **st_lease_pp) FAST_FUNC;
    114 #else
    115 # define log_static_leases(st_lease_pp) ((void)0)
    116 #endif
    117
    118
    119 void read_config(const char *file) FAST_FUNC;
    120 void write_leases(void) FAST_FUNC;
    121 void read_leases(const char *file) FAST_FUNC;
    122
    123
    124 POP_SAVED_FUNCTION_VISIBILITY
    125
    126 #endif