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