[457] | 1 | /**
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| 2 | * @file
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| 3 | * DHCP client API
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (c) 2001-2004 Leon Woestenberg <leon.woestenberg@gmx.net>
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| 8 | * Copyright (c) 2001-2004 Axon Digital Design B.V., The Netherlands.
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| 9 | * All rights reserved.
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| 10 | *
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| 11 | * Redistribution and use in source and binary forms, with or without modification,
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| 12 | * are permitted provided that the following conditions are met:
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| 13 | *
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| 14 | * 1. Redistributions of source code must retain the above copyright notice,
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| 15 | * this list of conditions and the following disclaimer.
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| 16 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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| 17 | * this list of conditions and the following disclaimer in the documentation
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| 18 | * and/or other materials provided with the distribution.
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| 19 | * 3. The name of the author may not be used to endorse or promote products
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| 20 | * derived from this software without specific prior written permission.
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| 21 | *
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| 22 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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| 23 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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| 24 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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| 25 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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| 26 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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| 27 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 28 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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| 29 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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| 30 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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| 31 | * OF SUCH DAMAGE.
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| 32 | *
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| 33 | * This file is part of the lwIP TCP/IP stack.
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| 34 | *
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| 35 | * Author: Leon Woestenberg <leon.woestenberg@gmx.net>
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| 36 | *
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| 37 | */
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| 38 | #ifndef LWIP_HDR_DHCP_H
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| 39 | #define LWIP_HDR_DHCP_H
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| 40 |
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| 41 | #include "lwip/opt.h"
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| 42 |
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| 43 | #if LWIP_DHCP /* don't build if not configured for use in lwipopts.h */
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| 44 |
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| 45 | #include "lwip/netif.h"
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| 46 | #include "lwip/udp.h"
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| 47 |
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| 48 | #ifdef __cplusplus
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| 49 | extern "C" {
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| 50 | #endif
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| 51 |
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| 52 | /** period (in seconds) of the application calling dhcp_coarse_tmr() */
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| 53 | #define DHCP_COARSE_TIMER_SECS 60
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| 54 | /** period (in milliseconds) of the application calling dhcp_coarse_tmr() */
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| 55 | #define DHCP_COARSE_TIMER_MSECS (DHCP_COARSE_TIMER_SECS * 1000UL)
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| 56 | /** period (in milliseconds) of the application calling dhcp_fine_tmr() */
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| 57 | #define DHCP_FINE_TIMER_MSECS 500
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| 58 |
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| 59 | #define DHCP_BOOT_FILE_LEN 128U
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| 60 |
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| 61 | /* AutoIP cooperation flags (struct dhcp.autoip_coop_state) */
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| 62 | typedef enum {
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| 63 | DHCP_AUTOIP_COOP_STATE_OFF = 0,
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| 64 | DHCP_AUTOIP_COOP_STATE_ON = 1
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| 65 | } dhcp_autoip_coop_state_enum_t;
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| 66 |
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| 67 | struct dhcp
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| 68 | {
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| 69 | /** transaction identifier of last sent request */
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| 70 | u32_t xid;
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| 71 | /** track PCB allocation state */
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| 72 | u8_t pcb_allocated;
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| 73 | /** current DHCP state machine state */
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| 74 | u8_t state;
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| 75 | /** retries of current request */
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| 76 | u8_t tries;
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| 77 | #if LWIP_DHCP_AUTOIP_COOP
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| 78 | u8_t autoip_coop_state;
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| 79 | #endif
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| 80 | u8_t subnet_mask_given;
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| 81 |
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| 82 | u16_t request_timeout; /* #ticks with period DHCP_FINE_TIMER_SECS for request timeout */
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| 83 | u16_t t1_timeout; /* #ticks with period DHCP_COARSE_TIMER_SECS for renewal time */
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| 84 | u16_t t2_timeout; /* #ticks with period DHCP_COARSE_TIMER_SECS for rebind time */
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| 85 | u16_t t1_renew_time; /* #ticks with period DHCP_COARSE_TIMER_SECS until next renew try */
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| 86 | u16_t t2_rebind_time; /* #ticks with period DHCP_COARSE_TIMER_SECS until next rebind try */
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| 87 | u16_t lease_used; /* #ticks with period DHCP_COARSE_TIMER_SECS since last received DHCP ack */
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| 88 | u16_t t0_timeout; /* #ticks with period DHCP_COARSE_TIMER_SECS for lease time */
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| 89 | ip_addr_t server_ip_addr; /* dhcp server address that offered this lease (ip_addr_t because passed to UDP) */
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| 90 | ip4_addr_t offered_ip_addr;
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| 91 | ip4_addr_t offered_sn_mask;
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| 92 | ip4_addr_t offered_gw_addr;
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| 93 |
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| 94 | u32_t offered_t0_lease; /* lease period (in seconds) */
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| 95 | u32_t offered_t1_renew; /* recommended renew time (usually 50% of lease period) */
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| 96 | u32_t offered_t2_rebind; /* recommended rebind time (usually 87.5 of lease period) */
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| 97 | #if LWIP_DHCP_BOOTP_FILE
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| 98 | ip4_addr_t offered_si_addr;
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| 99 | char boot_file_name[DHCP_BOOT_FILE_LEN];
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| 100 | #endif /* LWIP_DHCP_BOOTPFILE */
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| 101 | };
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| 102 |
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| 103 |
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| 104 | void dhcp_set_struct(struct netif *netif, struct dhcp *dhcp);
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| 105 | /** Remove a struct dhcp previously set to the netif using dhcp_set_struct() */
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| 106 | #define dhcp_remove_struct(netif) netif_set_client_data(netif, LWIP_NETIF_CLIENT_DATA_INDEX_DHCP, NULL)
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| 107 | void dhcp_cleanup(struct netif *netif);
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| 108 | err_t dhcp_start(struct netif *netif);
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| 109 | err_t dhcp_renew(struct netif *netif);
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| 110 | err_t dhcp_release(struct netif *netif);
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| 111 | void dhcp_stop(struct netif *netif);
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| 112 | void dhcp_release_and_stop(struct netif *netif);
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| 113 | void dhcp_inform(struct netif *netif);
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| 114 | void dhcp_network_changed(struct netif *netif);
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| 115 | #if DHCP_DOES_ARP_CHECK
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| 116 | void dhcp_arp_reply(struct netif *netif, const ip4_addr_t *addr);
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| 117 | #endif
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| 118 | u8_t dhcp_supplied_address(const struct netif *netif);
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| 119 | /* to be called every minute */
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| 120 | void dhcp_coarse_tmr(void);
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| 121 | /* to be called every half second */
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| 122 | void dhcp_fine_tmr(void);
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| 123 |
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| 124 | #if LWIP_DHCP_GET_NTP_SRV
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| 125 | /** This function must exist, in other to add offered NTP servers to
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| 126 | * the NTP (or SNTP) engine.
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| 127 | * See LWIP_DHCP_MAX_NTP_SERVERS */
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| 128 | extern void dhcp_set_ntp_servers(u8_t num_ntp_servers, const ip4_addr_t* ntp_server_addrs);
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| 129 | #endif /* LWIP_DHCP_GET_NTP_SRV */
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| 130 |
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| 131 | #define netif_dhcp_data(netif) ((struct dhcp*)netif_get_client_data(netif, LWIP_NETIF_CLIENT_DATA_INDEX_DHCP))
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| 132 |
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| 133 | #ifdef __cplusplus
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| 134 | }
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| 135 | #endif
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| 136 |
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| 137 | #endif /* LWIP_DHCP */
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| 138 |
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| 139 | #endif /*LWIP_HDR_DHCP_H*/
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