[164] | 1 | /**
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| 2 | * @file
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| 3 | * Dynamic Host Configuration Protocol client
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| 4 | *
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| 5 | */
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| 6 |
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| 7 | /*
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| 8 | *
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| 9 | * Copyright (c) 2001-2004 Leon Woestenberg <leon.woestenberg@gmx.net>
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| 10 | * Copyright (c) 2001-2004 Axon Digital Design B.V., The Netherlands.
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| 11 | * All rights reserved.
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| 12 | *
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| 13 | * Redistribution and use in source and binary forms, with or without modification,
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| 14 | * are permitted provided that the following conditions are met:
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| 15 | *
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| 16 | * 1. Redistributions of source code must retain the above copyright notice,
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| 17 | * this list of conditions and the following disclaimer.
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| 18 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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| 19 | * this list of conditions and the following disclaimer in the documentation
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| 20 | * and/or other materials provided with the distribution.
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| 21 | * 3. The name of the author may not be used to endorse or promote products
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| 22 | * derived from this software without specific prior written permission.
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| 23 | *
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| 24 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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| 25 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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| 26 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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| 27 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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| 28 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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| 29 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 30 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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| 31 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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| 32 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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| 33 | * OF SUCH DAMAGE.
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| 34 | *
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| 35 | * This file is a contribution to the lwIP TCP/IP stack.
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| 36 | * The Swedish Institute of Computer Science and Adam Dunkels
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| 37 | * are specifically granted permission to redistribute this
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| 38 | * source code.
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| 39 | *
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| 40 | * Author: Leon Woestenberg <leon.woestenberg@gmx.net>
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| 41 | *
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| 42 | * This is a DHCP client for the lwIP TCP/IP stack. It aims to conform
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| 43 | * with RFC 2131 and RFC 2132.
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| 44 | *
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| 45 | * TODO:
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| 46 | * - Support for interfaces other than Ethernet (SLIP, PPP, ...)
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| 47 | *
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| 48 | * Please coordinate changes and requests with Leon Woestenberg
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| 49 | * <leon.woestenberg@gmx.net>
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| 50 | *
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| 51 | * Integration with your code:
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| 52 | *
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| 53 | * In lwip/dhcp.h
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| 54 | * #define DHCP_COARSE_TIMER_SECS (recommended 60 which is a minute)
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| 55 | * #define DHCP_FINE_TIMER_MSECS (recommended 500 which equals TCP coarse timer)
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| 56 | *
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| 57 | * Then have your application call dhcp_coarse_tmr() and
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| 58 | * dhcp_fine_tmr() on the defined intervals.
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| 59 | *
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| 60 | * dhcp_start(struct netif *netif);
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| 61 | * starts a DHCP client instance which configures the interface by
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| 62 | * obtaining an IP address lease and maintaining it.
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| 63 | *
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| 64 | * Use dhcp_release(netif) to end the lease and use dhcp_stop(netif)
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| 65 | * to remove the DHCP client.
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| 66 | *
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| 67 | */
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| 68 |
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| 69 | #include "lwip/opt.h"
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| 70 |
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| 71 | #if LWIP_DHCP /* don't build if not configured for use in lwipopts.h */
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| 72 |
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| 73 | #include "lwip/stats.h"
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| 74 | #include "lwip/mem.h"
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| 75 | #include "lwip/udp.h"
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| 76 | #include "lwip/ip_addr.h"
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| 77 | #include "lwip/netif.h"
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| 78 | #include "lwip/def.h"
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| 79 | #include "lwip/dhcp.h"
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| 80 | #include "lwip/autoip.h"
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| 81 | #include "lwip/dns.h"
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| 82 | #include "netif/etharp.h"
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| 83 |
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| 84 | #include <string.h>
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| 85 |
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| 86 | /** DHCP_CREATE_RAND_XID: if this is set to 1, the xid is created using
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| 87 | * LWIP_RAND() (this overrides DHCP_GLOBAL_XID)
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| 88 | */
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| 89 | #ifndef DHCP_CREATE_RAND_XID
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| 90 | #define DHCP_CREATE_RAND_XID 1
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| 91 | #endif
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| 92 |
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| 93 | /** Default for DHCP_GLOBAL_XID is 0xABCD0000
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| 94 | * This can be changed by defining DHCP_GLOBAL_XID and DHCP_GLOBAL_XID_HEADER, e.g.
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| 95 | * #define DHCP_GLOBAL_XID_HEADER "stdlib.h"
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| 96 | * #define DHCP_GLOBAL_XID rand()
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| 97 | */
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| 98 | #ifdef DHCP_GLOBAL_XID_HEADER
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| 99 | #include DHCP_GLOBAL_XID_HEADER /* include optional starting XID generation prototypes */
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| 100 | #endif
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| 101 |
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| 102 | /** DHCP_OPTION_MAX_MSG_SIZE is set to the MTU
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| 103 | * MTU is checked to be big enough in dhcp_start */
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| 104 | #define DHCP_MAX_MSG_LEN(netif) (netif->mtu)
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| 105 | #define DHCP_MAX_MSG_LEN_MIN_REQUIRED 576
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| 106 | /** Minimum length for reply before packet is parsed */
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| 107 | #define DHCP_MIN_REPLY_LEN 44
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| 108 |
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| 109 | #define REBOOT_TRIES 2
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| 110 |
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| 111 | /** Option handling: options are parsed in dhcp_parse_reply
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| 112 | * and saved in an array where other functions can load them from.
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| 113 | * This might be moved into the struct dhcp (not necessarily since
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| 114 | * lwIP is single-threaded and the array is only used while in recv
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| 115 | * callback). */
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| 116 | #define DHCP_OPTION_IDX_OVERLOAD 0
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| 117 | #define DHCP_OPTION_IDX_MSG_TYPE 1
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| 118 | #define DHCP_OPTION_IDX_SERVER_ID 2
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| 119 | #define DHCP_OPTION_IDX_LEASE_TIME 3
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| 120 | #define DHCP_OPTION_IDX_T1 4
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| 121 | #define DHCP_OPTION_IDX_T2 5
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| 122 | #define DHCP_OPTION_IDX_SUBNET_MASK 6
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| 123 | #define DHCP_OPTION_IDX_ROUTER 7
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| 124 | #define DHCP_OPTION_IDX_DNS_SERVER 8
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| 125 | #define DHCP_OPTION_IDX_MAX (DHCP_OPTION_IDX_DNS_SERVER + DNS_MAX_SERVERS)
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| 126 |
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| 127 | /** Holds the decoded option values, only valid while in dhcp_recv.
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| 128 | @todo: move this into struct dhcp? */
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| 129 | u32_t dhcp_rx_options_val[DHCP_OPTION_IDX_MAX];
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| 130 | /** Holds a flag which option was received and is contained in dhcp_rx_options_val,
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| 131 | only valid while in dhcp_recv.
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| 132 | @todo: move this into struct dhcp? */
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| 133 | u8_t dhcp_rx_options_given[DHCP_OPTION_IDX_MAX];
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| 134 |
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| 135 | #ifdef DHCP_GLOBAL_XID
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| 136 | static u32_t xid;
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| 137 | static u8_t xid_initialised;
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| 138 | #endif /* DHCP_GLOBAL_XID */
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| 139 |
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| 140 | #define dhcp_option_given(dhcp, idx) (dhcp_rx_options_given[idx] != 0)
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| 141 | #define dhcp_got_option(dhcp, idx) (dhcp_rx_options_given[idx] = 1)
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| 142 | #define dhcp_clear_option(dhcp, idx) (dhcp_rx_options_given[idx] = 0)
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| 143 | #define dhcp_clear_all_options(dhcp) (memset(dhcp_rx_options_given, 0, sizeof(dhcp_rx_options_given)))
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| 144 | #define dhcp_get_option_value(dhcp, idx) (dhcp_rx_options_val[idx])
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| 145 | #define dhcp_set_option_value(dhcp, idx, val) (dhcp_rx_options_val[idx] = (val))
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| 146 |
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| 147 |
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| 148 | /* DHCP client state machine functions */
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| 149 | static err_t dhcp_discover(struct netif *netif);
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| 150 | static err_t dhcp_select(struct netif *netif);
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| 151 | static void dhcp_bind(struct netif *netif);
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| 152 | #if DHCP_DOES_ARP_CHECK
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| 153 | static err_t dhcp_decline(struct netif *netif);
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| 154 | #endif /* DHCP_DOES_ARP_CHECK */
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| 155 | static err_t dhcp_rebind(struct netif *netif);
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| 156 | static err_t dhcp_reboot(struct netif *netif);
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| 157 | static void dhcp_set_state(struct dhcp *dhcp, u8_t new_state);
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| 158 |
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| 159 | /* receive, unfold, parse and free incoming messages */
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| 160 | static void dhcp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port);
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| 161 |
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| 162 | /* set the DHCP timers */
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| 163 | static void dhcp_timeout(struct netif *netif);
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| 164 | static void dhcp_t1_timeout(struct netif *netif);
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| 165 | static void dhcp_t2_timeout(struct netif *netif);
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| 166 |
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| 167 | /* build outgoing messages */
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| 168 | /* create a DHCP message, fill in common headers */
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| 169 | static err_t dhcp_create_msg(struct netif *netif, struct dhcp *dhcp, u8_t message_type);
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| 170 | /* free a DHCP request */
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| 171 | static void dhcp_delete_msg(struct dhcp *dhcp);
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| 172 | /* add a DHCP option (type, then length in bytes) */
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| 173 | static void dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len);
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| 174 | /* add option values */
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| 175 | static void dhcp_option_byte(struct dhcp *dhcp, u8_t value);
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| 176 | static void dhcp_option_short(struct dhcp *dhcp, u16_t value);
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| 177 | static void dhcp_option_long(struct dhcp *dhcp, u32_t value);
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| 178 | #if LWIP_NETIF_HOSTNAME
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| 179 | static void dhcp_option_hostname(struct dhcp *dhcp, struct netif *netif);
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| 180 | #endif /* LWIP_NETIF_HOSTNAME */
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| 181 | /* always add the DHCP options trailer to end and pad */
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| 182 | static void dhcp_option_trailer(struct dhcp *dhcp);
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| 183 |
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| 184 | /**
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| 185 | * Back-off the DHCP client (because of a received NAK response).
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| 186 | *
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| 187 | * Back-off the DHCP client because of a received NAK. Receiving a
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| 188 | * NAK means the client asked for something non-sensible, for
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| 189 | * example when it tries to renew a lease obtained on another network.
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| 190 | *
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| 191 | * We clear any existing set IP address and restart DHCP negotiation
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| 192 | * afresh (as per RFC2131 3.2.3).
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| 193 | *
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| 194 | * @param netif the netif under DHCP control
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| 195 | */
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| 196 | static void
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| 197 | dhcp_handle_nak(struct netif *netif)
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| 198 | {
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| 199 | struct dhcp *dhcp = netif->dhcp;
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| 200 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_handle_nak(netif=%p) %c%c%"U16_F"\n",
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| 201 | (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
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| 202 | /* Set the interface down since the address must no longer be used, as per RFC2131 */
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| 203 | netif_set_down(netif);
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| 204 | /* remove IP address from interface */
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| 205 | netif_set_ipaddr(netif, IP_ADDR_ANY);
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| 206 | netif_set_gw(netif, IP_ADDR_ANY);
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| 207 | netif_set_netmask(netif, IP_ADDR_ANY);
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| 208 | /* Change to a defined state */
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| 209 | dhcp_set_state(dhcp, DHCP_BACKING_OFF);
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| 210 | /* We can immediately restart discovery */
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| 211 | dhcp_discover(netif);
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| 212 | }
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| 213 |
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| 214 | #if DHCP_DOES_ARP_CHECK
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| 215 | /**
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| 216 | * Checks if the offered IP address is already in use.
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| 217 | *
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| 218 | * It does so by sending an ARP request for the offered address and
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| 219 | * entering CHECKING state. If no ARP reply is received within a small
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| 220 | * interval, the address is assumed to be free for use by us.
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| 221 | *
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| 222 | * @param netif the netif under DHCP control
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| 223 | */
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| 224 | static void
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| 225 | dhcp_check(struct netif *netif)
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| 226 | {
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| 227 | struct dhcp *dhcp = netif->dhcp;
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| 228 | err_t result;
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| 229 | u16_t msecs;
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| 230 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_check(netif=%p) %c%c\n", (void *)netif, (s16_t)netif->name[0],
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| 231 | (s16_t)netif->name[1]));
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| 232 | dhcp_set_state(dhcp, DHCP_CHECKING);
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| 233 | /* create an ARP query for the offered IP address, expecting that no host
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| 234 | responds, as the IP address should not be in use. */
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| 235 | result = etharp_query(netif, &dhcp->offered_ip_addr, NULL);
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| 236 | if (result != ERR_OK) {
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| 237 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("dhcp_check: could not perform ARP query\n"));
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| 238 | }
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| 239 | dhcp->tries++;
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| 240 | msecs = 500;
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| 241 | dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
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| 242 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_check(): set request timeout %"U16_F" msecs\n", msecs));
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| 243 | }
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| 244 | #endif /* DHCP_DOES_ARP_CHECK */
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| 245 |
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| 246 | /**
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| 247 | * Remember the configuration offered by a DHCP server.
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| 248 | *
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| 249 | * @param netif the netif under DHCP control
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| 250 | */
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| 251 | static void
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| 252 | dhcp_handle_offer(struct netif *netif)
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| 253 | {
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| 254 | struct dhcp *dhcp = netif->dhcp;
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| 255 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_handle_offer(netif=%p) %c%c%"U16_F"\n",
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| 256 | (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
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| 257 | /* obtain the server address */
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| 258 | if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SERVER_ID)) {
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| 259 | ip4_addr_set_u32(&dhcp->server_ip_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SERVER_ID)));
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| 260 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_handle_offer(): server 0x%08"X32_F"\n",
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| 261 | ip4_addr_get_u32(&dhcp->server_ip_addr)));
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| 262 | /* remember offered address */
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| 263 | ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
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| 264 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_handle_offer(): offer for 0x%08"X32_F"\n",
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| 265 | ip4_addr_get_u32(&dhcp->offered_ip_addr)));
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| 266 |
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| 267 | dhcp_select(netif);
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| 268 | } else {
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| 269 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
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| 270 | ("dhcp_handle_offer(netif=%p) did not get server ID!\n", (void*)netif));
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| 271 | }
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| 272 | }
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| 273 |
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| 274 | /**
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| 275 | * Select a DHCP server offer out of all offers.
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| 276 | *
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| 277 | * Simply select the first offer received.
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| 278 | *
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| 279 | * @param netif the netif under DHCP control
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| 280 | * @return lwIP specific error (see error.h)
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| 281 | */
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| 282 | static err_t
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| 283 | dhcp_select(struct netif *netif)
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| 284 | {
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| 285 | struct dhcp *dhcp = netif->dhcp;
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| 286 | err_t result;
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| 287 | u16_t msecs;
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| 288 |
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| 289 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_select(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
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| 290 | dhcp_set_state(dhcp, DHCP_REQUESTING);
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| 291 |
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| 292 | /* create and initialize the DHCP message header */
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| 293 | result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
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| 294 | if (result == ERR_OK) {
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| 295 | dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
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| 296 | dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
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| 297 |
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| 298 | /* MUST request the offered IP address */
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| 299 | dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
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| 300 | dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
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| 301 |
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| 302 | dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
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| 303 | dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->server_ip_addr)));
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| 304 |
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| 305 | dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);
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| 306 | dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
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| 307 | dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
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| 308 | dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
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| 309 | dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
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| 310 |
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| 311 | #if LWIP_NETIF_HOSTNAME
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| 312 | dhcp_option_hostname(dhcp, netif);
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| 313 | #endif /* LWIP_NETIF_HOSTNAME */
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| 314 |
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| 315 | dhcp_option_trailer(dhcp);
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| 316 | /* shrink the pbuf to the actual content length */
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| 317 | pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
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| 318 |
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| 319 | /* send broadcast to any DHCP server */
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| 320 | udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
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| 321 | dhcp_delete_msg(dhcp);
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| 322 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_select: REQUESTING\n"));
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| 323 | } else {
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| 324 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("dhcp_select: could not allocate DHCP request\n"));
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| 325 | }
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| 326 | dhcp->tries++;
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| 327 | msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
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| 328 | dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
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| 329 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_select(): set request timeout %"U16_F" msecs\n", msecs));
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| 330 | return result;
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| 331 | }
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| 332 |
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| 333 | /**
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| 334 | * The DHCP timer that checks for lease renewal/rebind timeouts.
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| 335 | */
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| 336 | void
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| 337 | dhcp_coarse_tmr()
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| 338 | {
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| 339 | struct netif *netif = netif_list;
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| 340 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_coarse_tmr()\n"));
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| 341 | /* iterate through all network interfaces */
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| 342 | while (netif != NULL) {
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| 343 | /* only act on DHCP configured interfaces */
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| 344 | if (netif->dhcp != NULL) {
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| 345 | /* timer is active (non zero), and triggers (zeroes) now? */
|
---|
| 346 | if (netif->dhcp->t2_timeout-- == 1) {
|
---|
| 347 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t2 timeout\n"));
|
---|
| 348 | /* this clients' rebind timeout triggered */
|
---|
| 349 | dhcp_t2_timeout(netif);
|
---|
| 350 | /* timer is active (non zero), and triggers (zeroes) now */
|
---|
| 351 | } else if (netif->dhcp->t1_timeout-- == 1) {
|
---|
| 352 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t1 timeout\n"));
|
---|
| 353 | /* this clients' renewal timeout triggered */
|
---|
| 354 | dhcp_t1_timeout(netif);
|
---|
| 355 | }
|
---|
| 356 | }
|
---|
| 357 | /* proceed to next netif */
|
---|
| 358 | netif = netif->next;
|
---|
| 359 | }
|
---|
| 360 | }
|
---|
| 361 |
|
---|
| 362 | /**
|
---|
| 363 | * DHCP transaction timeout handling
|
---|
| 364 | *
|
---|
| 365 | * A DHCP server is expected to respond within a short period of time.
|
---|
| 366 | * This timer checks whether an outstanding DHCP request is timed out.
|
---|
| 367 | */
|
---|
| 368 | void
|
---|
| 369 | dhcp_fine_tmr()
|
---|
| 370 | {
|
---|
| 371 | struct netif *netif = netif_list;
|
---|
| 372 | /* loop through netif's */
|
---|
| 373 | while (netif != NULL) {
|
---|
| 374 | /* only act on DHCP configured interfaces */
|
---|
| 375 | if (netif->dhcp != NULL) {
|
---|
| 376 | /* timer is active (non zero), and is about to trigger now */
|
---|
| 377 | if (netif->dhcp->request_timeout > 1) {
|
---|
| 378 | netif->dhcp->request_timeout--;
|
---|
| 379 | }
|
---|
| 380 | else if (netif->dhcp->request_timeout == 1) {
|
---|
| 381 | netif->dhcp->request_timeout--;
|
---|
| 382 | /* { netif->dhcp->request_timeout == 0 } */
|
---|
| 383 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_fine_tmr(): request timeout\n"));
|
---|
| 384 | /* this client's request timeout triggered */
|
---|
| 385 | dhcp_timeout(netif);
|
---|
| 386 | }
|
---|
| 387 | }
|
---|
| 388 | /* proceed to next network interface */
|
---|
| 389 | netif = netif->next;
|
---|
| 390 | }
|
---|
| 391 | }
|
---|
| 392 |
|
---|
| 393 | /**
|
---|
| 394 | * A DHCP negotiation transaction, or ARP request, has timed out.
|
---|
| 395 | *
|
---|
| 396 | * The timer that was started with the DHCP or ARP request has
|
---|
| 397 | * timed out, indicating no response was received in time.
|
---|
| 398 | *
|
---|
| 399 | * @param netif the netif under DHCP control
|
---|
| 400 | */
|
---|
| 401 | static void
|
---|
| 402 | dhcp_timeout(struct netif *netif)
|
---|
| 403 | {
|
---|
| 404 | struct dhcp *dhcp = netif->dhcp;
|
---|
| 405 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_timeout()\n"));
|
---|
| 406 | /* back-off period has passed, or server selection timed out */
|
---|
| 407 | if ((dhcp->state == DHCP_BACKING_OFF) || (dhcp->state == DHCP_SELECTING)) {
|
---|
| 408 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_timeout(): restarting discovery\n"));
|
---|
| 409 | dhcp_discover(netif);
|
---|
| 410 | /* receiving the requested lease timed out */
|
---|
| 411 | } else if (dhcp->state == DHCP_REQUESTING) {
|
---|
| 412 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, DHCP request timed out\n"));
|
---|
| 413 | if (dhcp->tries <= 5) {
|
---|
| 414 | dhcp_select(netif);
|
---|
| 415 | } else {
|
---|
| 416 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, releasing, restarting\n"));
|
---|
| 417 | dhcp_release(netif);
|
---|
| 418 | dhcp_discover(netif);
|
---|
| 419 | }
|
---|
| 420 | #if DHCP_DOES_ARP_CHECK
|
---|
| 421 | /* received no ARP reply for the offered address (which is good) */
|
---|
| 422 | } else if (dhcp->state == DHCP_CHECKING) {
|
---|
| 423 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): CHECKING, ARP request timed out\n"));
|
---|
| 424 | if (dhcp->tries <= 1) {
|
---|
| 425 | dhcp_check(netif);
|
---|
| 426 | /* no ARP replies on the offered address,
|
---|
| 427 | looks like the IP address is indeed free */
|
---|
| 428 | } else {
|
---|
| 429 | /* bind the interface to the offered address */
|
---|
| 430 | dhcp_bind(netif);
|
---|
| 431 | }
|
---|
| 432 | #endif /* DHCP_DOES_ARP_CHECK */
|
---|
| 433 | }
|
---|
| 434 | /* did not get response to renew request? */
|
---|
| 435 | else if (dhcp->state == DHCP_RENEWING) {
|
---|
| 436 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): RENEWING, DHCP request timed out\n"));
|
---|
| 437 | /* just retry renewal */
|
---|
| 438 | /* note that the rebind timer will eventually time-out if renew does not work */
|
---|
| 439 | dhcp_renew(netif);
|
---|
| 440 | /* did not get response to rebind request? */
|
---|
| 441 | } else if (dhcp->state == DHCP_REBINDING) {
|
---|
| 442 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REBINDING, DHCP request timed out\n"));
|
---|
| 443 | if (dhcp->tries <= 8) {
|
---|
| 444 | dhcp_rebind(netif);
|
---|
| 445 | } else {
|
---|
| 446 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): RELEASING, DISCOVERING\n"));
|
---|
| 447 | dhcp_release(netif);
|
---|
| 448 | dhcp_discover(netif);
|
---|
| 449 | }
|
---|
| 450 | } else if (dhcp->state == DHCP_REBOOTING) {
|
---|
| 451 | if (dhcp->tries < REBOOT_TRIES) {
|
---|
| 452 | dhcp_reboot(netif);
|
---|
| 453 | } else {
|
---|
| 454 | dhcp_discover(netif);
|
---|
| 455 | }
|
---|
| 456 | }
|
---|
| 457 | }
|
---|
| 458 |
|
---|
| 459 | /**
|
---|
| 460 | * The renewal period has timed out.
|
---|
| 461 | *
|
---|
| 462 | * @param netif the netif under DHCP control
|
---|
| 463 | */
|
---|
| 464 | static void
|
---|
| 465 | dhcp_t1_timeout(struct netif *netif)
|
---|
| 466 | {
|
---|
| 467 | struct dhcp *dhcp = netif->dhcp;
|
---|
| 468 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_t1_timeout()\n"));
|
---|
| 469 | if ((dhcp->state == DHCP_REQUESTING) || (dhcp->state == DHCP_BOUND) ||
|
---|
| 470 | (dhcp->state == DHCP_RENEWING)) {
|
---|
| 471 | /* just retry to renew - note that the rebind timer (t2) will
|
---|
| 472 | * eventually time-out if renew tries fail. */
|
---|
| 473 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
|
---|
| 474 | ("dhcp_t1_timeout(): must renew\n"));
|
---|
| 475 | /* This slightly different to RFC2131: DHCPREQUEST will be sent from state
|
---|
| 476 | DHCP_RENEWING, not DHCP_BOUND */
|
---|
| 477 | dhcp_renew(netif);
|
---|
| 478 | }
|
---|
| 479 | }
|
---|
| 480 |
|
---|
| 481 | /**
|
---|
| 482 | * The rebind period has timed out.
|
---|
| 483 | *
|
---|
| 484 | * @param netif the netif under DHCP control
|
---|
| 485 | */
|
---|
| 486 | static void
|
---|
| 487 | dhcp_t2_timeout(struct netif *netif)
|
---|
| 488 | {
|
---|
| 489 | struct dhcp *dhcp = netif->dhcp;
|
---|
| 490 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_t2_timeout()\n"));
|
---|
| 491 | if ((dhcp->state == DHCP_REQUESTING) || (dhcp->state == DHCP_BOUND) ||
|
---|
| 492 | (dhcp->state == DHCP_RENEWING)) {
|
---|
| 493 | /* just retry to rebind */
|
---|
| 494 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
|
---|
| 495 | ("dhcp_t2_timeout(): must rebind\n"));
|
---|
| 496 | /* This slightly different to RFC2131: DHCPREQUEST will be sent from state
|
---|
| 497 | DHCP_REBINDING, not DHCP_BOUND */
|
---|
| 498 | dhcp_rebind(netif);
|
---|
| 499 | }
|
---|
| 500 | }
|
---|
| 501 |
|
---|
| 502 | /**
|
---|
| 503 | * Handle a DHCP ACK packet
|
---|
| 504 | *
|
---|
| 505 | * @param netif the netif under DHCP control
|
---|
| 506 | */
|
---|
| 507 | static void
|
---|
| 508 | dhcp_handle_ack(struct netif *netif)
|
---|
| 509 | {
|
---|
| 510 | struct dhcp *dhcp = netif->dhcp;
|
---|
| 511 | #if LWIP_DNS
|
---|
| 512 | u8_t n;
|
---|
| 513 | #endif /* LWIP_DNS */
|
---|
| 514 |
|
---|
| 515 | /* clear options we might not get from the ACK */
|
---|
| 516 | ip_addr_set_zero(&dhcp->offered_sn_mask);
|
---|
| 517 | ip_addr_set_zero(&dhcp->offered_gw_addr);
|
---|
| 518 | #if LWIP_DHCP_BOOTP_FILE
|
---|
| 519 | ip_addr_set_zero(&dhcp->offered_si_addr);
|
---|
| 520 | #endif /* LWIP_DHCP_BOOTP_FILE */
|
---|
| 521 |
|
---|
| 522 | /* lease time given? */
|
---|
| 523 | if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_LEASE_TIME)) {
|
---|
| 524 | /* remember offered lease time */
|
---|
| 525 | dhcp->offered_t0_lease = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_LEASE_TIME);
|
---|
| 526 | }
|
---|
| 527 | /* renewal period given? */
|
---|
| 528 | if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T1)) {
|
---|
| 529 | /* remember given renewal period */
|
---|
| 530 | dhcp->offered_t1_renew = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T1);
|
---|
| 531 | } else {
|
---|
| 532 | /* calculate safe periods for renewal */
|
---|
| 533 | dhcp->offered_t1_renew = dhcp->offered_t0_lease / 2;
|
---|
| 534 | }
|
---|
| 535 |
|
---|
| 536 | /* renewal period given? */
|
---|
| 537 | if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T2)) {
|
---|
| 538 | /* remember given rebind period */
|
---|
| 539 | dhcp->offered_t2_rebind = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T2);
|
---|
| 540 | } else {
|
---|
| 541 | /* calculate safe periods for rebinding */
|
---|
| 542 | dhcp->offered_t2_rebind = dhcp->offered_t0_lease;
|
---|
| 543 | }
|
---|
| 544 |
|
---|
| 545 | /* (y)our internet address */
|
---|
| 546 | ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
|
---|
| 547 |
|
---|
| 548 | #if LWIP_DHCP_BOOTP_FILE
|
---|
| 549 | /* copy boot server address,
|
---|
| 550 | boot file name copied in dhcp_parse_reply if not overloaded */
|
---|
| 551 | ip_addr_copy(dhcp->offered_si_addr, dhcp->msg_in->siaddr);
|
---|
| 552 | #endif /* LWIP_DHCP_BOOTP_FILE */
|
---|
| 553 |
|
---|
| 554 | /* subnet mask given? */
|
---|
| 555 | if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)) {
|
---|
| 556 | /* remember given subnet mask */
|
---|
| 557 | ip4_addr_set_u32(&dhcp->offered_sn_mask, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)));
|
---|
| 558 | dhcp->subnet_mask_given = 1;
|
---|
| 559 | } else {
|
---|
| 560 | dhcp->subnet_mask_given = 0;
|
---|
| 561 | }
|
---|
| 562 |
|
---|
| 563 | /* gateway router */
|
---|
| 564 | if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_ROUTER)) {
|
---|
| 565 | ip4_addr_set_u32(&dhcp->offered_gw_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_ROUTER)));
|
---|
| 566 | }
|
---|
| 567 |
|
---|
| 568 | #if LWIP_DNS
|
---|
| 569 | /* DNS servers */
|
---|
| 570 | n = 0;
|
---|
| 571 | while(dhcp_option_given(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n) && (n < DNS_MAX_SERVERS)) {
|
---|
| 572 | ip_addr_t dns_addr;
|
---|
| 573 | ip4_addr_set_u32(&dns_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n)));
|
---|
| 574 | dns_setserver(n, &dns_addr);
|
---|
| 575 | n++;
|
---|
| 576 | }
|
---|
| 577 | #endif /* LWIP_DNS */
|
---|
| 578 | }
|
---|
| 579 |
|
---|
| 580 | /** Set a statically allocated struct dhcp to work with.
|
---|
| 581 | * Using this prevents dhcp_start to allocate it using mem_malloc.
|
---|
| 582 | *
|
---|
| 583 | * @param netif the netif for which to set the struct dhcp
|
---|
| 584 | * @param dhcp (uninitialised) dhcp struct allocated by the application
|
---|
| 585 | */
|
---|
| 586 | void
|
---|
| 587 | dhcp_set_struct(struct netif *netif, struct dhcp *dhcp)
|
---|
| 588 | {
|
---|
| 589 | LWIP_ASSERT("netif != NULL", netif != NULL);
|
---|
| 590 | LWIP_ASSERT("dhcp != NULL", dhcp != NULL);
|
---|
| 591 | LWIP_ASSERT("netif already has a struct dhcp set", netif->dhcp == NULL);
|
---|
| 592 |
|
---|
| 593 | /* clear data structure */
|
---|
| 594 | memset(dhcp, 0, sizeof(struct dhcp));
|
---|
| 595 | /* dhcp_set_state(&dhcp, DHCP_OFF); */
|
---|
| 596 | netif->dhcp = dhcp;
|
---|
| 597 | }
|
---|
| 598 |
|
---|
| 599 | /** Removes a struct dhcp from a netif.
|
---|
| 600 | *
|
---|
| 601 | * ATTENTION: Only use this when not using dhcp_set_struct() to allocate the
|
---|
| 602 | * struct dhcp since the memory is passed back to the heap.
|
---|
| 603 | *
|
---|
| 604 | * @param netif the netif from which to remove the struct dhcp
|
---|
| 605 | */
|
---|
| 606 | void dhcp_cleanup(struct netif *netif)
|
---|
| 607 | {
|
---|
| 608 | LWIP_ASSERT("netif != NULL", netif != NULL);
|
---|
| 609 |
|
---|
| 610 | if (netif->dhcp != NULL) {
|
---|
| 611 | mem_free(netif->dhcp);
|
---|
| 612 | netif->dhcp = NULL;
|
---|
| 613 | }
|
---|
| 614 | }
|
---|
| 615 |
|
---|
| 616 | /**
|
---|
| 617 | * Start DHCP negotiation for a network interface.
|
---|
| 618 | *
|
---|
| 619 | * If no DHCP client instance was attached to this interface,
|
---|
| 620 | * a new client is created first. If a DHCP client instance
|
---|
| 621 | * was already present, it restarts negotiation.
|
---|
| 622 | *
|
---|
| 623 | * @param netif The lwIP network interface
|
---|
| 624 | * @return lwIP error code
|
---|
| 625 | * - ERR_OK - No error
|
---|
| 626 | * - ERR_MEM - Out of memory
|
---|
| 627 | */
|
---|
| 628 | err_t
|
---|
| 629 | dhcp_start(struct netif *netif)
|
---|
| 630 | {
|
---|
| 631 | struct dhcp *dhcp;
|
---|
| 632 | err_t result = ERR_OK;
|
---|
| 633 |
|
---|
| 634 | LWIP_ERROR("netif != NULL", (netif != NULL), return ERR_ARG;);
|
---|
| 635 | dhcp = netif->dhcp;
|
---|
| 636 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_start(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
|
---|
| 637 | /* Remove the flag that says this netif is handled by DHCP,
|
---|
| 638 | it is set when we succeeded starting. */
|
---|
| 639 | netif->flags &= ~NETIF_FLAG_DHCP;
|
---|
| 640 |
|
---|
| 641 | /* check hwtype of the netif */
|
---|
| 642 | if ((netif->flags & NETIF_FLAG_ETHARP) == 0) {
|
---|
| 643 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): No ETHARP netif\n"));
|
---|
| 644 | return ERR_ARG;
|
---|
| 645 | }
|
---|
| 646 |
|
---|
| 647 | /* check MTU of the netif */
|
---|
| 648 | if (netif->mtu < DHCP_MAX_MSG_LEN_MIN_REQUIRED) {
|
---|
| 649 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): Cannot use this netif with DHCP: MTU is too small\n"));
|
---|
| 650 | return ERR_MEM;
|
---|
| 651 | }
|
---|
| 652 |
|
---|
| 653 | /* no DHCP client attached yet? */
|
---|
| 654 | if (dhcp == NULL) {
|
---|
| 655 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): starting new DHCP client\n"));
|
---|
| 656 | dhcp = (struct dhcp *)mem_malloc(sizeof(struct dhcp));
|
---|
| 657 | if (dhcp == NULL) {
|
---|
| 658 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): could not allocate dhcp\n"));
|
---|
| 659 | return ERR_MEM;
|
---|
| 660 | }
|
---|
| 661 | /* store this dhcp client in the netif */
|
---|
| 662 | netif->dhcp = dhcp;
|
---|
| 663 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): allocated dhcp"));
|
---|
| 664 | /* already has DHCP client attached */
|
---|
| 665 | } else {
|
---|
| 666 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_start(): restarting DHCP configuration\n"));
|
---|
| 667 | if (dhcp->pcb != NULL) {
|
---|
| 668 | udp_remove(dhcp->pcb);
|
---|
| 669 | }
|
---|
| 670 | LWIP_ASSERT("pbuf p_out wasn't freed", dhcp->p_out == NULL);
|
---|
| 671 | LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL );
|
---|
| 672 | }
|
---|
| 673 |
|
---|
| 674 | /* clear data structure */
|
---|
| 675 | memset(dhcp, 0, sizeof(struct dhcp));
|
---|
| 676 | /* dhcp_set_state(&dhcp, DHCP_OFF); */
|
---|
| 677 | /* allocate UDP PCB */
|
---|
| 678 | dhcp->pcb = udp_new();
|
---|
| 679 | if (dhcp->pcb == NULL) {
|
---|
| 680 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): could not obtain pcb\n"));
|
---|
| 681 | return ERR_MEM;
|
---|
| 682 | }
|
---|
| 683 | ip_set_option(dhcp->pcb, SOF_BROADCAST);
|
---|
| 684 | /* set up local and remote port for the pcb */
|
---|
| 685 | udp_bind(dhcp->pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
|
---|
| 686 | udp_connect(dhcp->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
|
---|
| 687 | /* set up the recv callback and argument */
|
---|
| 688 | udp_recv(dhcp->pcb, dhcp_recv, netif);
|
---|
| 689 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): starting DHCP configuration\n"));
|
---|
| 690 | /* (re)start the DHCP negotiation */
|
---|
| 691 | result = dhcp_discover(netif);
|
---|
| 692 | if (result != ERR_OK) {
|
---|
| 693 | /* free resources allocated above */
|
---|
| 694 | dhcp_stop(netif);
|
---|
| 695 | return ERR_MEM;
|
---|
| 696 | }
|
---|
| 697 | /* Set the flag that says this netif is handled by DHCP. */
|
---|
| 698 | netif->flags |= NETIF_FLAG_DHCP;
|
---|
| 699 | return result;
|
---|
| 700 | }
|
---|
| 701 |
|
---|
| 702 | /**
|
---|
| 703 | * Inform a DHCP server of our manual configuration.
|
---|
| 704 | *
|
---|
| 705 | * This informs DHCP servers of our fixed IP address configuration
|
---|
| 706 | * by sending an INFORM message. It does not involve DHCP address
|
---|
| 707 | * configuration, it is just here to be nice to the network.
|
---|
| 708 | *
|
---|
| 709 | * @param netif The lwIP network interface
|
---|
| 710 | */
|
---|
| 711 | void
|
---|
| 712 | dhcp_inform(struct netif *netif)
|
---|
| 713 | {
|
---|
| 714 | struct dhcp dhcp;
|
---|
| 715 | err_t result = ERR_OK;
|
---|
| 716 | struct udp_pcb *pcb;
|
---|
| 717 |
|
---|
| 718 | LWIP_ERROR("netif != NULL", (netif != NULL), return;);
|
---|
| 719 |
|
---|
| 720 | memset(&dhcp, 0, sizeof(struct dhcp));
|
---|
| 721 | dhcp_set_state(&dhcp, DHCP_INFORM);
|
---|
| 722 |
|
---|
| 723 | if ((netif->dhcp != NULL) && (netif->dhcp->pcb != NULL)) {
|
---|
| 724 | /* re-use existing pcb */
|
---|
| 725 | pcb = netif->dhcp->pcb;
|
---|
| 726 | } else {
|
---|
| 727 | pcb = udp_new();
|
---|
| 728 | if (pcb == NULL) {
|
---|
| 729 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform(): could not obtain pcb"));
|
---|
| 730 | return;
|
---|
| 731 | }
|
---|
| 732 | dhcp.pcb = pcb;
|
---|
| 733 | ip_set_option(dhcp.pcb, SOF_BROADCAST);
|
---|
| 734 | udp_bind(dhcp.pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
|
---|
| 735 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_inform(): created new udp pcb\n"));
|
---|
| 736 | }
|
---|
| 737 | /* create and initialize the DHCP message header */
|
---|
| 738 | result = dhcp_create_msg(netif, &dhcp, DHCP_INFORM);
|
---|
| 739 | if (result == ERR_OK) {
|
---|
| 740 | dhcp_option(&dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
|
---|
| 741 | dhcp_option_short(&dhcp, DHCP_MAX_MSG_LEN(netif));
|
---|
| 742 |
|
---|
| 743 | dhcp_option_trailer(&dhcp);
|
---|
| 744 |
|
---|
| 745 | pbuf_realloc(dhcp.p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp.options_out_len);
|
---|
| 746 |
|
---|
| 747 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_inform: INFORMING\n"));
|
---|
| 748 | udp_sendto_if(pcb, dhcp.p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
|
---|
| 749 | dhcp_delete_msg(&dhcp);
|
---|
| 750 | } else {
|
---|
| 751 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform: could not allocate DHCP request\n"));
|
---|
| 752 | }
|
---|
| 753 |
|
---|
| 754 | if (dhcp.pcb != NULL) {
|
---|
| 755 | /* otherwise, the existing pcb was used */
|
---|
| 756 | udp_remove(dhcp.pcb);
|
---|
| 757 | }
|
---|
| 758 | }
|
---|
| 759 |
|
---|
| 760 | /** Handle a possible change in the network configuration.
|
---|
| 761 | *
|
---|
| 762 | * This enters the REBOOTING state to verify that the currently bound
|
---|
| 763 | * address is still valid.
|
---|
| 764 | */
|
---|
| 765 | void
|
---|
| 766 | dhcp_network_changed(struct netif *netif)
|
---|
| 767 | {
|
---|
| 768 | struct dhcp *dhcp = netif->dhcp;
|
---|
| 769 | if (!dhcp)
|
---|
| 770 | return;
|
---|
| 771 | switch (dhcp->state) {
|
---|
| 772 | case DHCP_REBINDING:
|
---|
| 773 | case DHCP_RENEWING:
|
---|
| 774 | case DHCP_BOUND:
|
---|
| 775 | case DHCP_REBOOTING:
|
---|
| 776 | netif_set_down(netif);
|
---|
| 777 | dhcp->tries = 0;
|
---|
| 778 | dhcp_reboot(netif);
|
---|
| 779 | break;
|
---|
| 780 | case DHCP_OFF:
|
---|
| 781 | /* stay off */
|
---|
| 782 | break;
|
---|
| 783 | default:
|
---|
| 784 | dhcp->tries = 0;
|
---|
| 785 | #if LWIP_DHCP_AUTOIP_COOP
|
---|
| 786 | if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
|
---|
| 787 | autoip_stop(netif);
|
---|
| 788 | dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
|
---|
| 789 | }
|
---|
| 790 | #endif /* LWIP_DHCP_AUTOIP_COOP */
|
---|
| 791 | dhcp_discover(netif);
|
---|
| 792 | break;
|
---|
| 793 | }
|
---|
| 794 | }
|
---|
| 795 |
|
---|
| 796 | #if DHCP_DOES_ARP_CHECK
|
---|
| 797 | /**
|
---|
| 798 | * Match an ARP reply with the offered IP address.
|
---|
| 799 | *
|
---|
| 800 | * @param netif the network interface on which the reply was received
|
---|
| 801 | * @param addr The IP address we received a reply from
|
---|
| 802 | */
|
---|
| 803 | void dhcp_arp_reply(struct netif *netif, ip_addr_t *addr)
|
---|
| 804 | {
|
---|
| 805 | LWIP_ERROR("netif != NULL", (netif != NULL), return;);
|
---|
| 806 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_arp_reply()\n"));
|
---|
| 807 | /* is a DHCP client doing an ARP check? */
|
---|
| 808 | if ((netif->dhcp != NULL) && (netif->dhcp->state == DHCP_CHECKING)) {
|
---|
| 809 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_arp_reply(): CHECKING, arp reply for 0x%08"X32_F"\n",
|
---|
| 810 | ip4_addr_get_u32(addr)));
|
---|
| 811 | /* did a host respond with the address we
|
---|
| 812 | were offered by the DHCP server? */
|
---|
| 813 | if (ip_addr_cmp(addr, &netif->dhcp->offered_ip_addr)) {
|
---|
| 814 | /* we will not accept the offered address */
|
---|
| 815 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING,
|
---|
| 816 | ("dhcp_arp_reply(): arp reply matched with offered address, declining\n"));
|
---|
| 817 | dhcp_decline(netif);
|
---|
| 818 | }
|
---|
| 819 | }
|
---|
| 820 | }
|
---|
| 821 |
|
---|
| 822 | /**
|
---|
| 823 | * Decline an offered lease.
|
---|
| 824 | *
|
---|
| 825 | * Tell the DHCP server we do not accept the offered address.
|
---|
| 826 | * One reason to decline the lease is when we find out the address
|
---|
| 827 | * is already in use by another host (through ARP).
|
---|
| 828 | *
|
---|
| 829 | * @param netif the netif under DHCP control
|
---|
| 830 | */
|
---|
| 831 | static err_t
|
---|
| 832 | dhcp_decline(struct netif *netif)
|
---|
| 833 | {
|
---|
| 834 | struct dhcp *dhcp = netif->dhcp;
|
---|
| 835 | err_t result = ERR_OK;
|
---|
| 836 | u16_t msecs;
|
---|
| 837 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_decline()\n"));
|
---|
| 838 | dhcp_set_state(dhcp, DHCP_BACKING_OFF);
|
---|
| 839 | /* create and initialize the DHCP message header */
|
---|
| 840 | result = dhcp_create_msg(netif, dhcp, DHCP_DECLINE);
|
---|
| 841 | if (result == ERR_OK) {
|
---|
| 842 | dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
|
---|
| 843 | dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
|
---|
| 844 |
|
---|
| 845 | dhcp_option_trailer(dhcp);
|
---|
| 846 | /* resize pbuf to reflect true size of options */
|
---|
| 847 | pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
|
---|
| 848 |
|
---|
| 849 | /* per section 4.4.4, broadcast DECLINE messages */
|
---|
| 850 | udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
|
---|
| 851 | dhcp_delete_msg(dhcp);
|
---|
| 852 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_decline: BACKING OFF\n"));
|
---|
| 853 | } else {
|
---|
| 854 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
|
---|
| 855 | ("dhcp_decline: could not allocate DHCP request\n"));
|
---|
| 856 | }
|
---|
| 857 | dhcp->tries++;
|
---|
| 858 | msecs = 10*1000;
|
---|
| 859 | dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
|
---|
| 860 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_decline(): set request timeout %"U16_F" msecs\n", msecs));
|
---|
| 861 | return result;
|
---|
| 862 | }
|
---|
| 863 | #endif /* DHCP_DOES_ARP_CHECK */
|
---|
| 864 |
|
---|
| 865 |
|
---|
| 866 | /**
|
---|
| 867 | * Start the DHCP process, discover a DHCP server.
|
---|
| 868 | *
|
---|
| 869 | * @param netif the netif under DHCP control
|
---|
| 870 | */
|
---|
| 871 | static err_t
|
---|
| 872 | dhcp_discover(struct netif *netif)
|
---|
| 873 | {
|
---|
| 874 | struct dhcp *dhcp = netif->dhcp;
|
---|
| 875 | err_t result = ERR_OK;
|
---|
| 876 | u16_t msecs;
|
---|
| 877 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover()\n"));
|
---|
| 878 | ip_addr_set_any(&dhcp->offered_ip_addr);
|
---|
| 879 | dhcp_set_state(dhcp, DHCP_SELECTING);
|
---|
| 880 | /* create and initialize the DHCP message header */
|
---|
| 881 | result = dhcp_create_msg(netif, dhcp, DHCP_DISCOVER);
|
---|
| 882 | if (result == ERR_OK) {
|
---|
| 883 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: making request\n"));
|
---|
| 884 |
|
---|
| 885 | dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
|
---|
| 886 | dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
|
---|
| 887 |
|
---|
| 888 | dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);
|
---|
| 889 | dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
|
---|
| 890 | dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
|
---|
| 891 | dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
|
---|
| 892 | dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
|
---|
| 893 |
|
---|
| 894 | dhcp_option_trailer(dhcp);
|
---|
| 895 |
|
---|
| 896 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: realloc()ing\n"));
|
---|
| 897 | pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
|
---|
| 898 |
|
---|
| 899 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: sendto(DISCOVER, IP_ADDR_BROADCAST, DHCP_SERVER_PORT)\n"));
|
---|
| 900 | udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
|
---|
| 901 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: deleting()ing\n"));
|
---|
| 902 | dhcp_delete_msg(dhcp);
|
---|
| 903 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_discover: SELECTING\n"));
|
---|
| 904 | } else {
|
---|
| 905 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_discover: could not allocate DHCP request\n"));
|
---|
| 906 | }
|
---|
| 907 | dhcp->tries++;
|
---|
| 908 | #if LWIP_DHCP_AUTOIP_COOP
|
---|
| 909 | if(dhcp->tries >= LWIP_DHCP_AUTOIP_COOP_TRIES && dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_OFF) {
|
---|
| 910 | dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_ON;
|
---|
| 911 | autoip_start(netif);
|
---|
| 912 | }
|
---|
| 913 | #endif /* LWIP_DHCP_AUTOIP_COOP */
|
---|
| 914 | msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
|
---|
| 915 | dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
|
---|
| 916 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_discover(): set request timeout %"U16_F" msecs\n", msecs));
|
---|
| 917 | return result;
|
---|
| 918 | }
|
---|
| 919 |
|
---|
| 920 |
|
---|
| 921 | /**
|
---|
| 922 | * Bind the interface to the offered IP address.
|
---|
| 923 | *
|
---|
| 924 | * @param netif network interface to bind to the offered address
|
---|
| 925 | */
|
---|
| 926 | static void
|
---|
| 927 | dhcp_bind(struct netif *netif)
|
---|
| 928 | {
|
---|
| 929 | u32_t timeout;
|
---|
| 930 | struct dhcp *dhcp;
|
---|
| 931 | ip_addr_t sn_mask, gw_addr;
|
---|
| 932 | LWIP_ERROR("dhcp_bind: netif != NULL", (netif != NULL), return;);
|
---|
| 933 | dhcp = netif->dhcp;
|
---|
| 934 | LWIP_ERROR("dhcp_bind: dhcp != NULL", (dhcp != NULL), return;);
|
---|
| 935 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
|
---|
| 936 |
|
---|
| 937 | /* temporary DHCP lease? */
|
---|
| 938 | if (dhcp->offered_t1_renew != 0xffffffffUL) {
|
---|
| 939 | /* set renewal period timer */
|
---|
| 940 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(): t1 renewal timer %"U32_F" secs\n", dhcp->offered_t1_renew));
|
---|
| 941 | timeout = (dhcp->offered_t1_renew + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
|
---|
| 942 | if(timeout > 0xffff) {
|
---|
| 943 | timeout = 0xffff;
|
---|
| 944 | }
|
---|
| 945 | dhcp->t1_timeout = (u16_t)timeout;
|
---|
| 946 | if (dhcp->t1_timeout == 0) {
|
---|
| 947 | dhcp->t1_timeout = 1;
|
---|
| 948 | }
|
---|
| 949 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_bind(): set request timeout %"U32_F" msecs\n", dhcp->offered_t1_renew*1000));
|
---|
| 950 | }
|
---|
| 951 | /* set renewal period timer */
|
---|
| 952 | if (dhcp->offered_t2_rebind != 0xffffffffUL) {
|
---|
| 953 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(): t2 rebind timer %"U32_F" secs\n", dhcp->offered_t2_rebind));
|
---|
| 954 | timeout = (dhcp->offered_t2_rebind + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
|
---|
| 955 | if(timeout > 0xffff) {
|
---|
| 956 | timeout = 0xffff;
|
---|
| 957 | }
|
---|
| 958 | dhcp->t2_timeout = (u16_t)timeout;
|
---|
| 959 | if (dhcp->t2_timeout == 0) {
|
---|
| 960 | dhcp->t2_timeout = 1;
|
---|
| 961 | }
|
---|
| 962 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_bind(): set request timeout %"U32_F" msecs\n", dhcp->offered_t2_rebind*1000));
|
---|
| 963 | }
|
---|
| 964 |
|
---|
| 965 | /* If we have sub 1 minute lease, t2 and t1 will kick in at the same time. */
|
---|
| 966 | if ((dhcp->t1_timeout >= dhcp->t2_timeout) && (dhcp->t2_timeout > 0)) {
|
---|
| 967 | dhcp->t1_timeout = 0;
|
---|
| 968 | }
|
---|
| 969 |
|
---|
| 970 | if (dhcp->subnet_mask_given) {
|
---|
| 971 | /* copy offered network mask */
|
---|
| 972 | ip_addr_copy(sn_mask, dhcp->offered_sn_mask);
|
---|
| 973 | } else {
|
---|
| 974 | /* subnet mask not given, choose a safe subnet mask given the network class */
|
---|
| 975 | u8_t first_octet = ip4_addr1(&dhcp->offered_ip_addr);
|
---|
| 976 | if (first_octet <= 127) {
|
---|
| 977 | ip4_addr_set_u32(&sn_mask, PP_HTONL(0xff000000UL));
|
---|
| 978 | } else if (first_octet >= 192) {
|
---|
| 979 | ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffffff00UL));
|
---|
| 980 | } else {
|
---|
| 981 | ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffff0000UL));
|
---|
| 982 | }
|
---|
| 983 | }
|
---|
| 984 |
|
---|
| 985 | ip_addr_copy(gw_addr, dhcp->offered_gw_addr);
|
---|
| 986 | /* gateway address not given? */
|
---|
| 987 | if (ip_addr_isany(&gw_addr)) {
|
---|
| 988 | /* copy network address */
|
---|
| 989 | ip_addr_get_network(&gw_addr, &dhcp->offered_ip_addr, &sn_mask);
|
---|
| 990 | /* use first host address on network as gateway */
|
---|
| 991 | ip4_addr_set_u32(&gw_addr, ip4_addr_get_u32(&gw_addr) | PP_HTONL(0x00000001UL));
|
---|
| 992 | }
|
---|
| 993 |
|
---|
| 994 | #if LWIP_DHCP_AUTOIP_COOP
|
---|
| 995 | if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
|
---|
| 996 | autoip_stop(netif);
|
---|
| 997 | dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
|
---|
| 998 | }
|
---|
| 999 | #endif /* LWIP_DHCP_AUTOIP_COOP */
|
---|
| 1000 |
|
---|
| 1001 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): IP: 0x%08"X32_F"\n",
|
---|
| 1002 | ip4_addr_get_u32(&dhcp->offered_ip_addr)));
|
---|
| 1003 | netif_set_ipaddr(netif, &dhcp->offered_ip_addr);
|
---|
| 1004 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): SN: 0x%08"X32_F"\n",
|
---|
| 1005 | ip4_addr_get_u32(&sn_mask)));
|
---|
| 1006 | netif_set_netmask(netif, &sn_mask);
|
---|
| 1007 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): GW: 0x%08"X32_F"\n",
|
---|
| 1008 | ip4_addr_get_u32(&gw_addr)));
|
---|
| 1009 | netif_set_gw(netif, &gw_addr);
|
---|
| 1010 | /* bring the interface up */
|
---|
| 1011 | netif_set_up(netif);
|
---|
| 1012 | /* netif is now bound to DHCP leased address */
|
---|
| 1013 | dhcp_set_state(dhcp, DHCP_BOUND);
|
---|
| 1014 | }
|
---|
| 1015 |
|
---|
| 1016 | /**
|
---|
| 1017 | * Renew an existing DHCP lease at the involved DHCP server.
|
---|
| 1018 | *
|
---|
| 1019 | * @param netif network interface which must renew its lease
|
---|
| 1020 | */
|
---|
| 1021 | err_t
|
---|
| 1022 | dhcp_renew(struct netif *netif)
|
---|
| 1023 | {
|
---|
| 1024 | struct dhcp *dhcp = netif->dhcp;
|
---|
| 1025 | err_t result;
|
---|
| 1026 | u16_t msecs;
|
---|
| 1027 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_renew()\n"));
|
---|
| 1028 | dhcp_set_state(dhcp, DHCP_RENEWING);
|
---|
| 1029 |
|
---|
| 1030 | /* create and initialize the DHCP message header */
|
---|
| 1031 | result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
|
---|
| 1032 | if (result == ERR_OK) {
|
---|
| 1033 | dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
|
---|
| 1034 | dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
|
---|
| 1035 |
|
---|
| 1036 | #if 0
|
---|
| 1037 | dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
|
---|
| 1038 | dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
|
---|
| 1039 | #endif
|
---|
| 1040 |
|
---|
| 1041 | #if 0
|
---|
| 1042 | dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
|
---|
| 1043 | dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
|
---|
| 1044 | #endif
|
---|
| 1045 |
|
---|
| 1046 | #if LWIP_NETIF_HOSTNAME
|
---|
| 1047 | dhcp_option_hostname(dhcp, netif);
|
---|
| 1048 | #endif /* LWIP_NETIF_HOSTNAME */
|
---|
| 1049 |
|
---|
| 1050 | /* append DHCP message trailer */
|
---|
| 1051 | dhcp_option_trailer(dhcp);
|
---|
| 1052 |
|
---|
| 1053 | pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
|
---|
| 1054 |
|
---|
| 1055 | udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
|
---|
| 1056 | dhcp_delete_msg(dhcp);
|
---|
| 1057 |
|
---|
| 1058 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_renew: RENEWING\n"));
|
---|
| 1059 | } else {
|
---|
| 1060 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_renew: could not allocate DHCP request\n"));
|
---|
| 1061 | }
|
---|
| 1062 | dhcp->tries++;
|
---|
| 1063 | /* back-off on retries, but to a maximum of 20 seconds */
|
---|
| 1064 | msecs = dhcp->tries < 10 ? dhcp->tries * 2000 : 20 * 1000;
|
---|
| 1065 | dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
|
---|
| 1066 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_renew(): set request timeout %"U16_F" msecs\n", msecs));
|
---|
| 1067 | return result;
|
---|
| 1068 | }
|
---|
| 1069 |
|
---|
| 1070 | /**
|
---|
| 1071 | * Rebind with a DHCP server for an existing DHCP lease.
|
---|
| 1072 | *
|
---|
| 1073 | * @param netif network interface which must rebind with a DHCP server
|
---|
| 1074 | */
|
---|
| 1075 | static err_t
|
---|
| 1076 | dhcp_rebind(struct netif *netif)
|
---|
| 1077 | {
|
---|
| 1078 | struct dhcp *dhcp = netif->dhcp;
|
---|
| 1079 | err_t result;
|
---|
| 1080 | u16_t msecs;
|
---|
| 1081 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind()\n"));
|
---|
| 1082 | dhcp_set_state(dhcp, DHCP_REBINDING);
|
---|
| 1083 |
|
---|
| 1084 | /* create and initialize the DHCP message header */
|
---|
| 1085 | result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
|
---|
| 1086 | if (result == ERR_OK) {
|
---|
| 1087 | dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
|
---|
| 1088 | dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
|
---|
| 1089 |
|
---|
| 1090 | #if LWIP_NETIF_HOSTNAME
|
---|
| 1091 | dhcp_option_hostname(dhcp, netif);
|
---|
| 1092 | #endif /* LWIP_NETIF_HOSTNAME */
|
---|
| 1093 |
|
---|
| 1094 | #if 0
|
---|
| 1095 | dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
|
---|
| 1096 | dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
|
---|
| 1097 |
|
---|
| 1098 | dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
|
---|
| 1099 | dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
|
---|
| 1100 | #endif
|
---|
| 1101 |
|
---|
| 1102 | dhcp_option_trailer(dhcp);
|
---|
| 1103 |
|
---|
| 1104 | pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
|
---|
| 1105 |
|
---|
| 1106 | /* broadcast to server */
|
---|
| 1107 | udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
|
---|
| 1108 | dhcp_delete_msg(dhcp);
|
---|
| 1109 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind: REBINDING\n"));
|
---|
| 1110 | } else {
|
---|
| 1111 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_rebind: could not allocate DHCP request\n"));
|
---|
| 1112 | }
|
---|
| 1113 | dhcp->tries++;
|
---|
| 1114 | msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
|
---|
| 1115 | dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
|
---|
| 1116 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind(): set request timeout %"U16_F" msecs\n", msecs));
|
---|
| 1117 | return result;
|
---|
| 1118 | }
|
---|
| 1119 |
|
---|
| 1120 | /**
|
---|
| 1121 | * Enter REBOOTING state to verify an existing lease
|
---|
| 1122 | *
|
---|
| 1123 | * @param netif network interface which must reboot
|
---|
| 1124 | */
|
---|
| 1125 | static err_t
|
---|
| 1126 | dhcp_reboot(struct netif *netif)
|
---|
| 1127 | {
|
---|
| 1128 | struct dhcp *dhcp = netif->dhcp;
|
---|
| 1129 | err_t result;
|
---|
| 1130 | u16_t msecs;
|
---|
| 1131 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot()\n"));
|
---|
| 1132 | dhcp_set_state(dhcp, DHCP_REBOOTING);
|
---|
| 1133 |
|
---|
| 1134 | /* create and initialize the DHCP message header */
|
---|
| 1135 | result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
|
---|
| 1136 | if (result == ERR_OK) {
|
---|
| 1137 | dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
|
---|
| 1138 | dhcp_option_short(dhcp, 576);
|
---|
| 1139 |
|
---|
| 1140 | dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
|
---|
| 1141 | dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
|
---|
| 1142 |
|
---|
| 1143 | dhcp_option_trailer(dhcp);
|
---|
| 1144 |
|
---|
| 1145 | pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
|
---|
| 1146 |
|
---|
| 1147 | /* broadcast to server */
|
---|
| 1148 | udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
|
---|
| 1149 | dhcp_delete_msg(dhcp);
|
---|
| 1150 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot: REBOOTING\n"));
|
---|
| 1151 | } else {
|
---|
| 1152 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_reboot: could not allocate DHCP request\n"));
|
---|
| 1153 | }
|
---|
| 1154 | dhcp->tries++;
|
---|
| 1155 | msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
|
---|
| 1156 | dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
|
---|
| 1157 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot(): set request timeout %"U16_F" msecs\n", msecs));
|
---|
| 1158 | return result;
|
---|
| 1159 | }
|
---|
| 1160 |
|
---|
| 1161 |
|
---|
| 1162 | /**
|
---|
| 1163 | * Release a DHCP lease.
|
---|
| 1164 | *
|
---|
| 1165 | * @param netif network interface which must release its lease
|
---|
| 1166 | */
|
---|
| 1167 | err_t
|
---|
| 1168 | dhcp_release(struct netif *netif)
|
---|
| 1169 | {
|
---|
| 1170 | struct dhcp *dhcp = netif->dhcp;
|
---|
| 1171 | err_t result;
|
---|
| 1172 | u16_t msecs;
|
---|
| 1173 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_release()\n"));
|
---|
| 1174 |
|
---|
| 1175 | /* idle DHCP client */
|
---|
| 1176 | dhcp_set_state(dhcp, DHCP_OFF);
|
---|
| 1177 | /* clean old DHCP offer */
|
---|
| 1178 | ip_addr_set_zero(&dhcp->server_ip_addr);
|
---|
| 1179 | ip_addr_set_zero(&dhcp->offered_ip_addr);
|
---|
| 1180 | ip_addr_set_zero(&dhcp->offered_sn_mask);
|
---|
| 1181 | ip_addr_set_zero(&dhcp->offered_gw_addr);
|
---|
| 1182 | #if LWIP_DHCP_BOOTP_FILE
|
---|
| 1183 | ip_addr_set_zero(&dhcp->offered_si_addr);
|
---|
| 1184 | #endif /* LWIP_DHCP_BOOTP_FILE */
|
---|
| 1185 | dhcp->offered_t0_lease = dhcp->offered_t1_renew = dhcp->offered_t2_rebind = 0;
|
---|
| 1186 |
|
---|
| 1187 | /* create and initialize the DHCP message header */
|
---|
| 1188 | result = dhcp_create_msg(netif, dhcp, DHCP_RELEASE);
|
---|
| 1189 | if (result == ERR_OK) {
|
---|
| 1190 | dhcp_option_trailer(dhcp);
|
---|
| 1191 |
|
---|
| 1192 | pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
|
---|
| 1193 |
|
---|
| 1194 | udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
|
---|
| 1195 | dhcp_delete_msg(dhcp);
|
---|
| 1196 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_release: RELEASED, DHCP_OFF\n"));
|
---|
| 1197 | } else {
|
---|
| 1198 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_release: could not allocate DHCP request\n"));
|
---|
| 1199 | }
|
---|
| 1200 | dhcp->tries++;
|
---|
| 1201 | msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
|
---|
| 1202 | dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
|
---|
| 1203 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_release(): set request timeout %"U16_F" msecs\n", msecs));
|
---|
| 1204 | /* bring the interface down */
|
---|
| 1205 | netif_set_down(netif);
|
---|
| 1206 | /* remove IP address from interface */
|
---|
| 1207 | netif_set_ipaddr(netif, IP_ADDR_ANY);
|
---|
| 1208 | netif_set_gw(netif, IP_ADDR_ANY);
|
---|
| 1209 | netif_set_netmask(netif, IP_ADDR_ANY);
|
---|
| 1210 |
|
---|
| 1211 | return result;
|
---|
| 1212 | }
|
---|
| 1213 |
|
---|
| 1214 | /**
|
---|
| 1215 | * Remove the DHCP client from the interface.
|
---|
| 1216 | *
|
---|
| 1217 | * @param netif The network interface to stop DHCP on
|
---|
| 1218 | */
|
---|
| 1219 | void
|
---|
| 1220 | dhcp_stop(struct netif *netif)
|
---|
| 1221 | {
|
---|
| 1222 | struct dhcp *dhcp;
|
---|
| 1223 | LWIP_ERROR("dhcp_stop: netif != NULL", (netif != NULL), return;);
|
---|
| 1224 | dhcp = netif->dhcp;
|
---|
| 1225 | /* Remove the flag that says this netif is handled by DHCP. */
|
---|
| 1226 | netif->flags &= ~NETIF_FLAG_DHCP;
|
---|
| 1227 |
|
---|
| 1228 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_stop()\n"));
|
---|
| 1229 | /* netif is DHCP configured? */
|
---|
| 1230 | if (dhcp != NULL) {
|
---|
| 1231 | #if LWIP_DHCP_AUTOIP_COOP
|
---|
| 1232 | if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
|
---|
| 1233 | autoip_stop(netif);
|
---|
| 1234 | dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
|
---|
| 1235 | }
|
---|
| 1236 | #endif /* LWIP_DHCP_AUTOIP_COOP */
|
---|
| 1237 |
|
---|
| 1238 | if (dhcp->pcb != NULL) {
|
---|
| 1239 | udp_remove(dhcp->pcb);
|
---|
| 1240 | dhcp->pcb = NULL;
|
---|
| 1241 | }
|
---|
| 1242 | LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
|
---|
| 1243 | dhcp_set_state(dhcp, DHCP_OFF);
|
---|
| 1244 | }
|
---|
| 1245 | }
|
---|
| 1246 |
|
---|
| 1247 | /*
|
---|
| 1248 | * Set the DHCP state of a DHCP client.
|
---|
| 1249 | *
|
---|
| 1250 | * If the state changed, reset the number of tries.
|
---|
| 1251 | */
|
---|
| 1252 | static void
|
---|
| 1253 | dhcp_set_state(struct dhcp *dhcp, u8_t new_state)
|
---|
| 1254 | {
|
---|
| 1255 | if (new_state != dhcp->state) {
|
---|
| 1256 | dhcp->state = new_state;
|
---|
| 1257 | dhcp->tries = 0;
|
---|
| 1258 | dhcp->request_timeout = 0;
|
---|
| 1259 | }
|
---|
| 1260 | }
|
---|
| 1261 |
|
---|
| 1262 | /*
|
---|
| 1263 | * Concatenate an option type and length field to the outgoing
|
---|
| 1264 | * DHCP message.
|
---|
| 1265 | *
|
---|
| 1266 | */
|
---|
| 1267 | static void
|
---|
| 1268 | dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len)
|
---|
| 1269 | {
|
---|
| 1270 | LWIP_ASSERT("dhcp_option: dhcp->options_out_len + 2 + option_len <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U + option_len <= DHCP_OPTIONS_LEN);
|
---|
| 1271 | dhcp->msg_out->options[dhcp->options_out_len++] = option_type;
|
---|
| 1272 | dhcp->msg_out->options[dhcp->options_out_len++] = option_len;
|
---|
| 1273 | }
|
---|
| 1274 | /*
|
---|
| 1275 | * Concatenate a single byte to the outgoing DHCP message.
|
---|
| 1276 | *
|
---|
| 1277 | */
|
---|
| 1278 | static void
|
---|
| 1279 | dhcp_option_byte(struct dhcp *dhcp, u8_t value)
|
---|
| 1280 | {
|
---|
| 1281 | LWIP_ASSERT("dhcp_option_byte: dhcp->options_out_len < DHCP_OPTIONS_LEN", dhcp->options_out_len < DHCP_OPTIONS_LEN);
|
---|
| 1282 | dhcp->msg_out->options[dhcp->options_out_len++] = value;
|
---|
| 1283 | }
|
---|
| 1284 |
|
---|
| 1285 | static void
|
---|
| 1286 | dhcp_option_short(struct dhcp *dhcp, u16_t value)
|
---|
| 1287 | {
|
---|
| 1288 | LWIP_ASSERT("dhcp_option_short: dhcp->options_out_len + 2 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U <= DHCP_OPTIONS_LEN);
|
---|
| 1289 | dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff00U) >> 8);
|
---|
| 1290 | dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t) (value & 0x00ffU);
|
---|
| 1291 | }
|
---|
| 1292 |
|
---|
| 1293 | static void
|
---|
| 1294 | dhcp_option_long(struct dhcp *dhcp, u32_t value)
|
---|
| 1295 | {
|
---|
| 1296 | LWIP_ASSERT("dhcp_option_long: dhcp->options_out_len + 4 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 4U <= DHCP_OPTIONS_LEN);
|
---|
| 1297 | dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff000000UL) >> 24);
|
---|
| 1298 | dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x00ff0000UL) >> 16);
|
---|
| 1299 | dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x0000ff00UL) >> 8);
|
---|
| 1300 | dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x000000ffUL));
|
---|
| 1301 | }
|
---|
| 1302 |
|
---|
| 1303 | #if LWIP_NETIF_HOSTNAME
|
---|
| 1304 | static void
|
---|
| 1305 | dhcp_option_hostname(struct dhcp *dhcp, struct netif *netif)
|
---|
| 1306 | {
|
---|
| 1307 | if (netif->hostname != NULL) {
|
---|
| 1308 | size_t namelen = strlen(netif->hostname);
|
---|
| 1309 | if (namelen > 0) {
|
---|
| 1310 | u8_t len;
|
---|
| 1311 | const char *p = netif->hostname;
|
---|
| 1312 | /* Shrink len to available bytes (need 2 bytes for OPTION_HOSTNAME
|
---|
| 1313 | and 1 byte for trailer) */
|
---|
| 1314 | size_t available = DHCP_OPTIONS_LEN - dhcp->options_out_len - 3;
|
---|
| 1315 | LWIP_ASSERT("DHCP: hostname is too long!", namelen <= available);
|
---|
| 1316 | len = LWIP_MIN(namelen, available);
|
---|
| 1317 | dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, len);
|
---|
| 1318 | while (len--) {
|
---|
| 1319 | dhcp_option_byte(dhcp, *p++);
|
---|
| 1320 | }
|
---|
| 1321 | }
|
---|
| 1322 | }
|
---|
| 1323 | }
|
---|
| 1324 | #endif /* LWIP_NETIF_HOSTNAME */
|
---|
| 1325 |
|
---|
| 1326 | /**
|
---|
| 1327 | * Extract the DHCP message and the DHCP options.
|
---|
| 1328 | *
|
---|
| 1329 | * Extract the DHCP message and the DHCP options, each into a contiguous
|
---|
| 1330 | * piece of memory. As a DHCP message is variable sized by its options,
|
---|
| 1331 | * and also allows overriding some fields for options, the easy approach
|
---|
| 1332 | * is to first unfold the options into a conitguous piece of memory, and
|
---|
| 1333 | * use that further on.
|
---|
| 1334 | *
|
---|
| 1335 | */
|
---|
| 1336 | static err_t
|
---|
| 1337 | dhcp_parse_reply(struct dhcp *dhcp, struct pbuf *p)
|
---|
| 1338 | {
|
---|
| 1339 | u8_t *options;
|
---|
| 1340 | u16_t offset;
|
---|
| 1341 | u16_t offset_max;
|
---|
| 1342 | u16_t options_idx;
|
---|
| 1343 | u16_t options_idx_max;
|
---|
| 1344 | struct pbuf *q;
|
---|
| 1345 | int parse_file_as_options = 0;
|
---|
| 1346 | int parse_sname_as_options = 0;
|
---|
| 1347 |
|
---|
| 1348 | /* clear received options */
|
---|
| 1349 | dhcp_clear_all_options(dhcp);
|
---|
| 1350 | /* check that beginning of dhcp_msg (up to and including chaddr) is in first pbuf */
|
---|
| 1351 | if (p->len < DHCP_SNAME_OFS) {
|
---|
| 1352 | return ERR_BUF;
|
---|
| 1353 | }
|
---|
| 1354 | dhcp->msg_in = (struct dhcp_msg *)p->payload;
|
---|
| 1355 | #if LWIP_DHCP_BOOTP_FILE
|
---|
| 1356 | /* clear boot file name */
|
---|
| 1357 | dhcp->boot_file_name[0] = 0;
|
---|
| 1358 | #endif /* LWIP_DHCP_BOOTP_FILE */
|
---|
| 1359 |
|
---|
| 1360 | /* parse options */
|
---|
| 1361 |
|
---|
| 1362 | /* start with options field */
|
---|
| 1363 | options_idx = DHCP_OPTIONS_OFS;
|
---|
| 1364 | /* parse options to the end of the received packet */
|
---|
| 1365 | options_idx_max = p->tot_len;
|
---|
| 1366 | again:
|
---|
| 1367 | q = p;
|
---|
| 1368 | while((q != NULL) && (options_idx >= q->len)) {
|
---|
| 1369 | options_idx -= q->len;
|
---|
| 1370 | options_idx_max -= q->len;
|
---|
| 1371 | q = q->next;
|
---|
| 1372 | }
|
---|
| 1373 | if (q == NULL) {
|
---|
| 1374 | return ERR_BUF;
|
---|
| 1375 | }
|
---|
| 1376 | offset = options_idx;
|
---|
| 1377 | offset_max = options_idx_max;
|
---|
| 1378 | options = (u8_t*)q->payload;
|
---|
| 1379 | /* at least 1 byte to read and no end marker, then at least 3 bytes to read? */
|
---|
| 1380 | while((q != NULL) && (options[offset] != DHCP_OPTION_END) && (offset < offset_max)) {
|
---|
| 1381 | u8_t op = options[offset];
|
---|
| 1382 | u8_t len;
|
---|
| 1383 | u8_t decode_len = 0;
|
---|
| 1384 | int decode_idx = -1;
|
---|
| 1385 | u16_t val_offset = offset + 2;
|
---|
| 1386 | /* len byte might be in the next pbuf */
|
---|
| 1387 | if (offset + 1 < q->len) {
|
---|
| 1388 | len = options[offset + 1];
|
---|
| 1389 | } else {
|
---|
| 1390 | len = (q->next != NULL ? ((u8_t*)q->next->payload)[0] : 0);
|
---|
| 1391 | }
|
---|
| 1392 | /* LWIP_DEBUGF(DHCP_DEBUG, ("msg_offset=%"U16_F", q->len=%"U16_F, msg_offset, q->len)); */
|
---|
| 1393 | decode_len = len;
|
---|
| 1394 | switch(op) {
|
---|
| 1395 | /* case(DHCP_OPTION_END): handled above */
|
---|
| 1396 | case(DHCP_OPTION_PAD):
|
---|
| 1397 | /* special option: no len encoded */
|
---|
| 1398 | decode_len = len = 0;
|
---|
| 1399 | /* will be increased below */
|
---|
| 1400 | offset--;
|
---|
| 1401 | break;
|
---|
| 1402 | case(DHCP_OPTION_SUBNET_MASK):
|
---|
| 1403 | LWIP_ERROR("len == 4", len == 4, return ERR_VAL;);
|
---|
| 1404 | decode_idx = DHCP_OPTION_IDX_SUBNET_MASK;
|
---|
| 1405 | break;
|
---|
| 1406 | case(DHCP_OPTION_ROUTER):
|
---|
| 1407 | decode_len = 4; /* only copy the first given router */
|
---|
| 1408 | LWIP_ERROR("len >= decode_len", len >= decode_len, return ERR_VAL;);
|
---|
| 1409 | decode_idx = DHCP_OPTION_IDX_ROUTER;
|
---|
| 1410 | break;
|
---|
| 1411 | case(DHCP_OPTION_DNS_SERVER):
|
---|
| 1412 | /* special case: there might be more than one server */
|
---|
| 1413 | LWIP_ERROR("len % 4 == 0", len % 4 == 0, return ERR_VAL;);
|
---|
| 1414 | /* limit number of DNS servers */
|
---|
| 1415 | decode_len = LWIP_MIN(len, 4 * DNS_MAX_SERVERS);
|
---|
| 1416 | LWIP_ERROR("len >= decode_len", len >= decode_len, return ERR_VAL;);
|
---|
| 1417 | decode_idx = DHCP_OPTION_IDX_DNS_SERVER;
|
---|
| 1418 | break;
|
---|
| 1419 | case(DHCP_OPTION_LEASE_TIME):
|
---|
| 1420 | LWIP_ERROR("len == 4", len == 4, return ERR_VAL;);
|
---|
| 1421 | decode_idx = DHCP_OPTION_IDX_LEASE_TIME;
|
---|
| 1422 | break;
|
---|
| 1423 | case(DHCP_OPTION_OVERLOAD):
|
---|
| 1424 | LWIP_ERROR("len == 1", len == 1, return ERR_VAL;);
|
---|
| 1425 | decode_idx = DHCP_OPTION_IDX_OVERLOAD;
|
---|
| 1426 | break;
|
---|
| 1427 | case(DHCP_OPTION_MESSAGE_TYPE):
|
---|
| 1428 | LWIP_ERROR("len == 1", len == 1, return ERR_VAL;);
|
---|
| 1429 | decode_idx = DHCP_OPTION_IDX_MSG_TYPE;
|
---|
| 1430 | break;
|
---|
| 1431 | case(DHCP_OPTION_SERVER_ID):
|
---|
| 1432 | LWIP_ERROR("len == 4", len == 4, return ERR_VAL;);
|
---|
| 1433 | decode_idx = DHCP_OPTION_IDX_SERVER_ID;
|
---|
| 1434 | break;
|
---|
| 1435 | case(DHCP_OPTION_T1):
|
---|
| 1436 | LWIP_ERROR("len == 4", len == 4, return ERR_VAL;);
|
---|
| 1437 | decode_idx = DHCP_OPTION_IDX_T1;
|
---|
| 1438 | break;
|
---|
| 1439 | case(DHCP_OPTION_T2):
|
---|
| 1440 | LWIP_ERROR("len == 4", len == 4, return ERR_VAL;);
|
---|
| 1441 | decode_idx = DHCP_OPTION_IDX_T2;
|
---|
| 1442 | break;
|
---|
| 1443 | default:
|
---|
| 1444 | decode_len = 0;
|
---|
| 1445 | LWIP_DEBUGF(DHCP_DEBUG, ("skipping option %"U16_F" in options\n", op));
|
---|
| 1446 | break;
|
---|
| 1447 | }
|
---|
| 1448 | offset += len + 2;
|
---|
| 1449 | if (decode_len > 0) {
|
---|
| 1450 | u32_t value = 0;
|
---|
| 1451 | u16_t copy_len;
|
---|
| 1452 | decode_next:
|
---|
| 1453 | LWIP_ASSERT("check decode_idx", decode_idx >= 0 && decode_idx < DHCP_OPTION_IDX_MAX);
|
---|
| 1454 | if (!dhcp_option_given(dhcp, decode_idx)) {
|
---|
| 1455 | copy_len = LWIP_MIN(decode_len, 4);
|
---|
| 1456 | pbuf_copy_partial(q, &value, copy_len, val_offset);
|
---|
| 1457 | if (decode_len > 4) {
|
---|
| 1458 | /* decode more than one u32_t */
|
---|
| 1459 | LWIP_ERROR("decode_len % 4 == 0", decode_len % 4 == 0, return ERR_VAL;);
|
---|
| 1460 | dhcp_got_option(dhcp, decode_idx);
|
---|
| 1461 | dhcp_set_option_value(dhcp, decode_idx, htonl(value));
|
---|
| 1462 | decode_len -= 4;
|
---|
| 1463 | val_offset += 4;
|
---|
| 1464 | decode_idx++;
|
---|
| 1465 | goto decode_next;
|
---|
| 1466 | } else if (decode_len == 4) {
|
---|
| 1467 | value = ntohl(value);
|
---|
| 1468 | } else {
|
---|
| 1469 | LWIP_ERROR("invalid decode_len", decode_len == 1, return ERR_VAL;);
|
---|
| 1470 | value = ((u8_t*)&value)[0];
|
---|
| 1471 | }
|
---|
| 1472 | dhcp_got_option(dhcp, decode_idx);
|
---|
| 1473 | dhcp_set_option_value(dhcp, decode_idx, value);
|
---|
| 1474 | }
|
---|
| 1475 | }
|
---|
| 1476 | if (offset >= q->len) {
|
---|
| 1477 | offset -= q->len;
|
---|
| 1478 | offset_max -= q->len;
|
---|
| 1479 | if ((offset < offset_max) && offset_max) {
|
---|
| 1480 | q = q->next;
|
---|
| 1481 | LWIP_ASSERT("next pbuf was null", q);
|
---|
| 1482 | options = (u8_t*)q->payload;
|
---|
| 1483 | } else {
|
---|
| 1484 | // We've run out of bytes, probably no end marker. Don't proceed.
|
---|
| 1485 | break;
|
---|
| 1486 | }
|
---|
| 1487 | }
|
---|
| 1488 | }
|
---|
| 1489 | /* is this an overloaded message? */
|
---|
| 1490 | if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_OVERLOAD)) {
|
---|
| 1491 | u32_t overload = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_OVERLOAD);
|
---|
| 1492 | dhcp_clear_option(dhcp, DHCP_OPTION_IDX_OVERLOAD);
|
---|
| 1493 | if (overload == DHCP_OVERLOAD_FILE) {
|
---|
| 1494 | parse_file_as_options = 1;
|
---|
| 1495 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded file field\n"));
|
---|
| 1496 | } else if (overload == DHCP_OVERLOAD_SNAME) {
|
---|
| 1497 | parse_sname_as_options = 1;
|
---|
| 1498 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded sname field\n"));
|
---|
| 1499 | } else if (overload == DHCP_OVERLOAD_SNAME_FILE) {
|
---|
| 1500 | parse_sname_as_options = 1;
|
---|
| 1501 | parse_file_as_options = 1;
|
---|
| 1502 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded sname and file field\n"));
|
---|
| 1503 | } else {
|
---|
| 1504 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("invalid overload option: %d\n", (int)overload));
|
---|
| 1505 | }
|
---|
| 1506 | #if LWIP_DHCP_BOOTP_FILE
|
---|
| 1507 | if (!parse_file_as_options) {
|
---|
| 1508 | /* only do this for ACK messages */
|
---|
| 1509 | if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE) &&
|
---|
| 1510 | (dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE) == DHCP_ACK))
|
---|
| 1511 | /* copy bootp file name, don't care for sname (server hostname) */
|
---|
| 1512 | pbuf_copy_partial(p, dhcp->boot_file_name, DHCP_FILE_LEN-1, DHCP_FILE_OFS);
|
---|
| 1513 | /* make sure the string is really NULL-terminated */
|
---|
| 1514 | dhcp->boot_file_name[DHCP_FILE_LEN-1] = 0;
|
---|
| 1515 | }
|
---|
| 1516 | #endif /* LWIP_DHCP_BOOTP_FILE */
|
---|
| 1517 | }
|
---|
| 1518 | if (parse_file_as_options) {
|
---|
| 1519 | /* if both are overloaded, parse file first and then sname (RFC 2131 ch. 4.1) */
|
---|
| 1520 | parse_file_as_options = 0;
|
---|
| 1521 | options_idx = DHCP_FILE_OFS;
|
---|
| 1522 | options_idx_max = DHCP_FILE_OFS + DHCP_FILE_LEN;
|
---|
| 1523 | goto again;
|
---|
| 1524 | } else if (parse_sname_as_options) {
|
---|
| 1525 | parse_sname_as_options = 0;
|
---|
| 1526 | options_idx = DHCP_SNAME_OFS;
|
---|
| 1527 | options_idx_max = DHCP_SNAME_OFS + DHCP_SNAME_LEN;
|
---|
| 1528 | goto again;
|
---|
| 1529 | }
|
---|
| 1530 | return ERR_OK;
|
---|
| 1531 | }
|
---|
| 1532 |
|
---|
| 1533 | /**
|
---|
| 1534 | * If an incoming DHCP message is in response to us, then trigger the state machine
|
---|
| 1535 | */
|
---|
| 1536 | static void
|
---|
| 1537 | dhcp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port)
|
---|
| 1538 | {
|
---|
| 1539 | struct netif *netif = (struct netif *)arg;
|
---|
| 1540 | struct dhcp *dhcp = netif->dhcp;
|
---|
| 1541 | struct dhcp_msg *reply_msg = (struct dhcp_msg *)p->payload;
|
---|
| 1542 | u8_t msg_type;
|
---|
| 1543 | u8_t i;
|
---|
| 1544 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_recv(pbuf = %p) from DHCP server %"U16_F".%"U16_F".%"U16_F".%"U16_F" port %"U16_F"\n", (void*)p,
|
---|
| 1545 | ip4_addr1_16(addr), ip4_addr2_16(addr), ip4_addr3_16(addr), ip4_addr4_16(addr), port));
|
---|
| 1546 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("pbuf->len = %"U16_F"\n", p->len));
|
---|
| 1547 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("pbuf->tot_len = %"U16_F"\n", p->tot_len));
|
---|
| 1548 | /* prevent warnings about unused arguments */
|
---|
| 1549 | LWIP_UNUSED_ARG(pcb);
|
---|
| 1550 | LWIP_UNUSED_ARG(addr);
|
---|
| 1551 | LWIP_UNUSED_ARG(port);
|
---|
| 1552 |
|
---|
| 1553 | LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
|
---|
| 1554 |
|
---|
| 1555 | if (p->len < DHCP_MIN_REPLY_LEN) {
|
---|
| 1556 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("DHCP reply message or pbuf too short\n"));
|
---|
| 1557 | goto free_pbuf_and_return;
|
---|
| 1558 | }
|
---|
| 1559 |
|
---|
| 1560 | if (reply_msg->op != DHCP_BOOTREPLY) {
|
---|
| 1561 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("not a DHCP reply message, but type %"U16_F"\n", (u16_t)reply_msg->op));
|
---|
| 1562 | goto free_pbuf_and_return;
|
---|
| 1563 | }
|
---|
| 1564 | /* iterate through hardware address and match against DHCP message */
|
---|
| 1565 | for (i = 0; i < netif->hwaddr_len; i++) {
|
---|
| 1566 | if (netif->hwaddr[i] != reply_msg->chaddr[i]) {
|
---|
| 1567 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
|
---|
| 1568 | ("netif->hwaddr[%"U16_F"]==%02"X16_F" != reply_msg->chaddr[%"U16_F"]==%02"X16_F"\n",
|
---|
| 1569 | (u16_t)i, (u16_t)netif->hwaddr[i], (u16_t)i, (u16_t)reply_msg->chaddr[i]));
|
---|
| 1570 | goto free_pbuf_and_return;
|
---|
| 1571 | }
|
---|
| 1572 | }
|
---|
| 1573 | /* match transaction ID against what we expected */
|
---|
| 1574 | if (ntohl(reply_msg->xid) != dhcp->xid) {
|
---|
| 1575 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
|
---|
| 1576 | ("transaction id mismatch reply_msg->xid(%"X32_F")!=dhcp->xid(%"X32_F")\n",ntohl(reply_msg->xid),dhcp->xid));
|
---|
| 1577 | goto free_pbuf_and_return;
|
---|
| 1578 | }
|
---|
| 1579 | /* option fields could be unfold? */
|
---|
| 1580 | if (dhcp_parse_reply(dhcp, p) != ERR_OK) {
|
---|
| 1581 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
|
---|
| 1582 | ("problem unfolding DHCP message - too short on memory?\n"));
|
---|
| 1583 | goto free_pbuf_and_return;
|
---|
| 1584 | }
|
---|
| 1585 |
|
---|
| 1586 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("searching DHCP_OPTION_MESSAGE_TYPE\n"));
|
---|
| 1587 | /* obtain pointer to DHCP message type */
|
---|
| 1588 | if (!dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE)) {
|
---|
| 1589 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("DHCP_OPTION_MESSAGE_TYPE option not found\n"));
|
---|
| 1590 | goto free_pbuf_and_return;
|
---|
| 1591 | }
|
---|
| 1592 |
|
---|
| 1593 | /* read DHCP message type */
|
---|
| 1594 | msg_type = (u8_t)dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE);
|
---|
| 1595 | /* message type is DHCP ACK? */
|
---|
| 1596 | if (msg_type == DHCP_ACK) {
|
---|
| 1597 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_ACK received\n"));
|
---|
| 1598 | /* in requesting state? */
|
---|
| 1599 | if (dhcp->state == DHCP_REQUESTING) {
|
---|
| 1600 | dhcp_handle_ack(netif);
|
---|
| 1601 | #if DHCP_DOES_ARP_CHECK
|
---|
| 1602 | /* check if the acknowledged lease address is already in use */
|
---|
| 1603 | dhcp_check(netif);
|
---|
| 1604 | #else
|
---|
| 1605 | /* bind interface to the acknowledged lease address */
|
---|
| 1606 | dhcp_bind(netif);
|
---|
| 1607 | #endif
|
---|
| 1608 | }
|
---|
| 1609 | /* already bound to the given lease address? */
|
---|
| 1610 | else if ((dhcp->state == DHCP_REBOOTING) || (dhcp->state == DHCP_REBINDING) || (dhcp->state == DHCP_RENEWING)) {
|
---|
| 1611 | dhcp_bind(netif);
|
---|
| 1612 | }
|
---|
| 1613 | }
|
---|
| 1614 | /* received a DHCP_NAK in appropriate state? */
|
---|
| 1615 | else if ((msg_type == DHCP_NAK) &&
|
---|
| 1616 | ((dhcp->state == DHCP_REBOOTING) || (dhcp->state == DHCP_REQUESTING) ||
|
---|
| 1617 | (dhcp->state == DHCP_REBINDING) || (dhcp->state == DHCP_RENEWING ))) {
|
---|
| 1618 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_NAK received\n"));
|
---|
| 1619 | dhcp_handle_nak(netif);
|
---|
| 1620 | }
|
---|
| 1621 | /* received a DHCP_OFFER in DHCP_SELECTING state? */
|
---|
| 1622 | else if ((msg_type == DHCP_OFFER) && (dhcp->state == DHCP_SELECTING)) {
|
---|
| 1623 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_OFFER received in DHCP_SELECTING state\n"));
|
---|
| 1624 | dhcp->request_timeout = 0;
|
---|
| 1625 | /* remember offered lease */
|
---|
| 1626 | dhcp_handle_offer(netif);
|
---|
| 1627 | }
|
---|
| 1628 | free_pbuf_and_return:
|
---|
| 1629 | dhcp->msg_in = NULL;
|
---|
| 1630 | pbuf_free(p);
|
---|
| 1631 | }
|
---|
| 1632 |
|
---|
| 1633 | /**
|
---|
| 1634 | * Create a DHCP request, fill in common headers
|
---|
| 1635 | *
|
---|
| 1636 | * @param netif the netif under DHCP control
|
---|
| 1637 | * @param dhcp dhcp control struct
|
---|
| 1638 | * @param message_type message type of the request
|
---|
| 1639 | */
|
---|
| 1640 | static err_t
|
---|
| 1641 | dhcp_create_msg(struct netif *netif, struct dhcp *dhcp, u8_t message_type)
|
---|
| 1642 | {
|
---|
| 1643 | u16_t i;
|
---|
| 1644 | #ifndef DHCP_GLOBAL_XID
|
---|
| 1645 | /** default global transaction identifier starting value (easy to match
|
---|
| 1646 | * with a packet analyser). We simply increment for each new request.
|
---|
| 1647 | * Predefine DHCP_GLOBAL_XID to a better value or a function call to generate one
|
---|
| 1648 | * at runtime, any supporting function prototypes can be defined in DHCP_GLOBAL_XID_HEADER */
|
---|
| 1649 | #if DHCP_CREATE_RAND_XID && defined(LWIP_RAND)
|
---|
| 1650 | static u32_t xid;
|
---|
| 1651 | #else /* DHCP_CREATE_RAND_XID && defined(LWIP_RAND) */
|
---|
| 1652 | static u32_t xid = 0xABCD0000;
|
---|
| 1653 | #endif /* DHCP_CREATE_RAND_XID && defined(LWIP_RAND) */
|
---|
| 1654 | #else
|
---|
| 1655 | if (!xid_initialised) {
|
---|
| 1656 | xid = DHCP_GLOBAL_XID;
|
---|
| 1657 | xid_initialised = !xid_initialised;
|
---|
| 1658 | }
|
---|
| 1659 | #endif
|
---|
| 1660 | LWIP_ERROR("dhcp_create_msg: netif != NULL", (netif != NULL), return ERR_ARG;);
|
---|
| 1661 | LWIP_ERROR("dhcp_create_msg: dhcp != NULL", (dhcp != NULL), return ERR_VAL;);
|
---|
| 1662 | LWIP_ASSERT("dhcp_create_msg: dhcp->p_out == NULL", dhcp->p_out == NULL);
|
---|
| 1663 | LWIP_ASSERT("dhcp_create_msg: dhcp->msg_out == NULL", dhcp->msg_out == NULL);
|
---|
| 1664 | dhcp->p_out = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct dhcp_msg), PBUF_RAM);
|
---|
| 1665 | if (dhcp->p_out == NULL) {
|
---|
| 1666 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
|
---|
| 1667 | ("dhcp_create_msg(): could not allocate pbuf\n"));
|
---|
| 1668 | return ERR_MEM;
|
---|
| 1669 | }
|
---|
| 1670 | LWIP_ASSERT("dhcp_create_msg: check that first pbuf can hold struct dhcp_msg",
|
---|
| 1671 | (dhcp->p_out->len >= sizeof(struct dhcp_msg)));
|
---|
| 1672 |
|
---|
| 1673 | /* reuse transaction identifier in retransmissions */
|
---|
| 1674 | if (dhcp->tries == 0) {
|
---|
| 1675 | #if DHCP_CREATE_RAND_XID && defined(LWIP_RAND)
|
---|
| 1676 | xid = LWIP_RAND();
|
---|
| 1677 | #else /* DHCP_CREATE_RAND_XID && defined(LWIP_RAND) */
|
---|
| 1678 | xid++;
|
---|
| 1679 | #endif /* DHCP_CREATE_RAND_XID && defined(LWIP_RAND) */
|
---|
| 1680 | }
|
---|
| 1681 | dhcp->xid = xid;
|
---|
| 1682 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE,
|
---|
| 1683 | ("transaction id xid(%"X32_F")\n", xid));
|
---|
| 1684 |
|
---|
| 1685 | dhcp->msg_out = (struct dhcp_msg *)dhcp->p_out->payload;
|
---|
| 1686 |
|
---|
| 1687 | dhcp->msg_out->op = DHCP_BOOTREQUEST;
|
---|
| 1688 | /* TODO: make link layer independent */
|
---|
| 1689 | dhcp->msg_out->htype = DHCP_HTYPE_ETH;
|
---|
| 1690 | dhcp->msg_out->hlen = netif->hwaddr_len;
|
---|
| 1691 | dhcp->msg_out->hops = 0;
|
---|
| 1692 | dhcp->msg_out->xid = htonl(dhcp->xid);
|
---|
| 1693 | dhcp->msg_out->secs = 0;
|
---|
| 1694 | /* we don't need the broadcast flag since we can receive unicast traffic
|
---|
| 1695 | before being fully configured! */
|
---|
| 1696 | dhcp->msg_out->flags = 0;
|
---|
| 1697 | ip_addr_set_zero(&dhcp->msg_out->ciaddr);
|
---|
| 1698 | /* set ciaddr to netif->ip_addr based on message_type and state */
|
---|
| 1699 | if ((message_type == DHCP_INFORM) || (message_type == DHCP_DECLINE) ||
|
---|
| 1700 | ((message_type == DHCP_REQUEST) && /* DHCP_BOUND not used for sending! */
|
---|
| 1701 | ((dhcp->state==DHCP_RENEWING) || dhcp->state==DHCP_REBINDING))) {
|
---|
| 1702 | ip_addr_copy(dhcp->msg_out->ciaddr, netif->ip_addr);
|
---|
| 1703 | }
|
---|
| 1704 | ip_addr_set_zero(&dhcp->msg_out->yiaddr);
|
---|
| 1705 | ip_addr_set_zero(&dhcp->msg_out->siaddr);
|
---|
| 1706 | ip_addr_set_zero(&dhcp->msg_out->giaddr);
|
---|
| 1707 | for (i = 0; i < DHCP_CHADDR_LEN; i++) {
|
---|
| 1708 | /* copy netif hardware address, pad with zeroes */
|
---|
| 1709 | dhcp->msg_out->chaddr[i] = (i < netif->hwaddr_len) ? netif->hwaddr[i] : 0/* pad byte*/;
|
---|
| 1710 | }
|
---|
| 1711 | for (i = 0; i < DHCP_SNAME_LEN; i++) {
|
---|
| 1712 | dhcp->msg_out->sname[i] = 0;
|
---|
| 1713 | }
|
---|
| 1714 | for (i = 0; i < DHCP_FILE_LEN; i++) {
|
---|
| 1715 | dhcp->msg_out->file[i] = 0;
|
---|
| 1716 | }
|
---|
| 1717 | dhcp->msg_out->cookie = PP_HTONL(DHCP_MAGIC_COOKIE);
|
---|
| 1718 | dhcp->options_out_len = 0;
|
---|
| 1719 | /* fill options field with an incrementing array (for debugging purposes) */
|
---|
| 1720 | for (i = 0; i < DHCP_OPTIONS_LEN; i++) {
|
---|
| 1721 | dhcp->msg_out->options[i] = (u8_t)i; /* for debugging only, no matter if truncated */
|
---|
| 1722 | }
|
---|
| 1723 | /* Add option MESSAGE_TYPE */
|
---|
| 1724 | dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
|
---|
| 1725 | dhcp_option_byte(dhcp, message_type);
|
---|
| 1726 | return ERR_OK;
|
---|
| 1727 | }
|
---|
| 1728 |
|
---|
| 1729 | /**
|
---|
| 1730 | * Free previously allocated memory used to send a DHCP request.
|
---|
| 1731 | *
|
---|
| 1732 | * @param dhcp the dhcp struct to free the request from
|
---|
| 1733 | */
|
---|
| 1734 | static void
|
---|
| 1735 | dhcp_delete_msg(struct dhcp *dhcp)
|
---|
| 1736 | {
|
---|
| 1737 | LWIP_ERROR("dhcp_delete_msg: dhcp != NULL", (dhcp != NULL), return;);
|
---|
| 1738 | LWIP_ASSERT("dhcp_delete_msg: dhcp->p_out != NULL", dhcp->p_out != NULL);
|
---|
| 1739 | LWIP_ASSERT("dhcp_delete_msg: dhcp->msg_out != NULL", dhcp->msg_out != NULL);
|
---|
| 1740 | if (dhcp->p_out != NULL) {
|
---|
| 1741 | pbuf_free(dhcp->p_out);
|
---|
| 1742 | }
|
---|
| 1743 | dhcp->p_out = NULL;
|
---|
| 1744 | dhcp->msg_out = NULL;
|
---|
| 1745 | }
|
---|
| 1746 |
|
---|
| 1747 | /**
|
---|
| 1748 | * Add a DHCP message trailer
|
---|
| 1749 | *
|
---|
| 1750 | * Adds the END option to the DHCP message, and if
|
---|
| 1751 | * necessary, up to three padding bytes.
|
---|
| 1752 | *
|
---|
| 1753 | * @param dhcp DHCP state structure
|
---|
| 1754 | */
|
---|
| 1755 | static void
|
---|
| 1756 | dhcp_option_trailer(struct dhcp *dhcp)
|
---|
| 1757 | {
|
---|
| 1758 | LWIP_ERROR("dhcp_option_trailer: dhcp != NULL", (dhcp != NULL), return;);
|
---|
| 1759 | LWIP_ASSERT("dhcp_option_trailer: dhcp->msg_out != NULL\n", dhcp->msg_out != NULL);
|
---|
| 1760 | LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
|
---|
| 1761 | dhcp->msg_out->options[dhcp->options_out_len++] = DHCP_OPTION_END;
|
---|
| 1762 | /* packet is too small, or not 4 byte aligned? */
|
---|
| 1763 | while (((dhcp->options_out_len < DHCP_MIN_OPTIONS_LEN) || (dhcp->options_out_len & 3)) &&
|
---|
| 1764 | (dhcp->options_out_len < DHCP_OPTIONS_LEN)) {
|
---|
| 1765 | /* add a fill/padding byte */
|
---|
| 1766 | dhcp->msg_out->options[dhcp->options_out_len++] = 0;
|
---|
| 1767 | }
|
---|
| 1768 | }
|
---|
| 1769 |
|
---|
| 1770 | #endif /* LWIP_DHCP */
|
---|