[101] | 1 | /*
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| 2 | * Copyright (c) 2005, Swedish Institute of Computer Science
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | * 1. Redistributions of source code must retain the above copyright
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| 9 | * notice, this list of conditions and the following disclaimer.
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| 10 | * 2. Redistributions in binary form must reproduce the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer in the
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| 12 | * documentation and/or other materials provided with the distribution.
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| 13 | * 3. Neither the name of the Institute nor the names of its contributors
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| 14 | * may be used to endorse or promote products derived from this software
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| 15 | * without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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| 18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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| 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 27 | * SUCH DAMAGE.
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| 28 | *
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| 29 | * This file is part of the uIP TCP/IP stack
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| 30 | *
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| 31 | * @(#)$Id: dhcpc.c 101 2015-06-02 15:37:23Z coas-nagasima $
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| 32 | */
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| 33 |
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| 34 | #include <stdio.h>
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| 35 | #include <string.h>
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| 36 |
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| 37 | #include "uip.h"
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| 38 | #include "dhcpc.h"
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| 39 | #include "timer.h"
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| 40 | #include "pt.h"
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| 41 |
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| 42 | #define STATE_INITIAL 0
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| 43 | #define STATE_SENDING 1
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| 44 | #define STATE_OFFER_RECEIVED 2
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| 45 | #define STATE_CONFIG_RECEIVED 3
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| 46 |
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| 47 | #ifdef __RX
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| 48 | #pragma pack
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| 49 | #elif _MSC_VER
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| 50 | #pragma pack(push, 1)
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| 51 | #endif
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| 52 |
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| 53 | struct dhcp_msg {
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| 54 | u8_t op, htype, hlen, hops;
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| 55 | u8_t xid[4];
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| 56 | u16_t secs, flags;
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| 57 | u8_t ciaddr[4];
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| 58 | u8_t yiaddr[4];
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| 59 | u8_t siaddr[4];
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| 60 | u8_t giaddr[4];
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| 61 | u8_t chaddr[16];
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| 62 | #ifndef UIP_CONF_DHCP_LIGHT
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| 63 | u8_t sname[64];
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| 64 | u8_t file[128];
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| 65 | #endif
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| 66 | u8_t options[312];
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| 67 | };
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| 68 |
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| 69 | #ifdef __RX
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| 70 | #pragma unpack
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| 71 | #elif _MSC_VER
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| 72 | #pragma pack(pop)
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| 73 | #endif
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| 74 |
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| 75 | #define BOOTP_BROADCAST 0x8000
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| 76 |
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| 77 | #define DHCP_REQUEST 1
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| 78 | #define DHCP_REPLY 2
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| 79 | #define DHCP_HTYPE_ETHERNET 1
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| 80 | #define DHCP_HLEN_ETHERNET 6
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| 81 | #define DHCP_MSG_LEN 236
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| 82 |
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| 83 | #define DHCPC_SERVER_PORT 67
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| 84 | #define DHCPC_CLIENT_PORT 68
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| 85 |
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| 86 | #define DHCPDISCOVER 1
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| 87 | #define DHCPOFFER 2
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| 88 | #define DHCPREQUEST 3
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| 89 | #define DHCPDECLINE 4
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| 90 | #define DHCPACK 5
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| 91 | #define DHCPNAK 6
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| 92 | #define DHCPRELEASE 7
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| 93 |
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| 94 | #define DHCP_OPTION_SUBNET_MASK 1
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| 95 | #define DHCP_OPTION_ROUTER 3
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| 96 | #define DHCP_OPTION_DNS_SERVER 6
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| 97 | #define DHCP_OPTION_REQ_IPADDR 50
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| 98 | #define DHCP_OPTION_LEASE_TIME 51
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| 99 | #define DHCP_OPTION_MSG_TYPE 53
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| 100 | #define DHCP_OPTION_SERVER_ID 54
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| 101 | #define DHCP_OPTION_REQ_LIST 55
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| 102 | #define DHCP_OPTION_END 255
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| 103 |
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| 104 | static const u8_t xid[4] = {0xad, 0xde, 0x12, 0x23};
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| 105 | static const u8_t magic_cookie[4] = {99, 130, 83, 99};
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| 106 | /*---------------------------------------------------------------------------*/
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| 107 | static u8_t *
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| 108 | add_msg_type(u8_t *optptr, u8_t type)
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| 109 | {
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| 110 | *optptr++ = DHCP_OPTION_MSG_TYPE;
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| 111 | *optptr++ = 1;
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| 112 | *optptr++ = type;
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| 113 | return optptr;
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| 114 | }
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| 115 | /*---------------------------------------------------------------------------*/
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| 116 | static u8_t *
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| 117 | add_server_id(struct dhcpc_state *s, u8_t *optptr)
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| 118 | {
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| 119 | *optptr++ = DHCP_OPTION_SERVER_ID;
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| 120 | *optptr++ = 4;
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| 121 | memcpy(optptr, s->serverid, 4);
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| 122 | return optptr + 4;
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| 123 | }
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| 124 | /*---------------------------------------------------------------------------*/
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| 125 | static u8_t *
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| 126 | add_req_ipaddr(struct dhcpc_state *s, u8_t *optptr)
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| 127 | {
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| 128 | *optptr++ = DHCP_OPTION_REQ_IPADDR;
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| 129 | *optptr++ = 4;
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| 130 | memcpy(optptr, s->ipaddr, 4);
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| 131 | return optptr + 4;
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| 132 | }
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| 133 | /*---------------------------------------------------------------------------*/
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| 134 | static u8_t *
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| 135 | add_req_options(u8_t *optptr)
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| 136 | {
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| 137 | *optptr++ = DHCP_OPTION_REQ_LIST;
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| 138 | *optptr++ = 3;
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| 139 | *optptr++ = DHCP_OPTION_SUBNET_MASK;
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| 140 | *optptr++ = DHCP_OPTION_ROUTER;
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| 141 | *optptr++ = DHCP_OPTION_DNS_SERVER;
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| 142 | return optptr;
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| 143 | }
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| 144 | /*---------------------------------------------------------------------------*/
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| 145 | static u8_t *
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| 146 | add_end(u8_t *optptr)
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| 147 | {
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| 148 | *optptr++ = DHCP_OPTION_END;
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| 149 | return optptr;
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| 150 | }
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| 151 | /*---------------------------------------------------------------------------*/
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| 152 | static void
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| 153 | create_msg(struct dhcpc_state *s, struct dhcp_msg *m)
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| 154 | {
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| 155 | m->op = DHCP_REQUEST;
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| 156 | m->htype = DHCP_HTYPE_ETHERNET;
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| 157 | m->hlen = s->mac_len;
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| 158 | m->hops = 0;
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| 159 | memcpy(m->xid, xid, sizeof(m->xid));
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| 160 | m->secs = 0;
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| 161 | m->flags = HTONS(BOOTP_BROADCAST); /* Broadcast bit. */
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| 162 | /* uip_ipaddr_copy(m->ciaddr, uip_hostaddr);*/
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| 163 | memcpy(m->ciaddr, uip_hostaddr, sizeof(m->ciaddr));
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| 164 | memset(m->yiaddr, 0, sizeof(m->yiaddr));
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| 165 | memset(m->siaddr, 0, sizeof(m->siaddr));
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| 166 | memset(m->giaddr, 0, sizeof(m->giaddr));
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| 167 | memcpy(m->chaddr, s->mac_addr, s->mac_len);
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| 168 | memset(&m->chaddr[s->mac_len], 0, sizeof(m->chaddr) - s->mac_len);
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| 169 | #ifndef UIP_CONF_DHCP_LIGHT
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| 170 | memset(m->sname, 0, sizeof(m->sname));
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| 171 | memset(m->file, 0, sizeof(m->file));
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| 172 | #endif
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| 173 |
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| 174 | memcpy(m->options, magic_cookie, sizeof(magic_cookie));
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| 175 | }
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| 176 | /*---------------------------------------------------------------------------*/
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| 177 | static void
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| 178 | send_discover(struct dhcpc_state *s)
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| 179 | {
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| 180 | u8_t *end;
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| 181 | struct dhcp_msg *m = (struct dhcp_msg *)uip_appdata;
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| 182 |
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| 183 | create_msg(s, m);
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| 184 |
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| 185 | end = add_msg_type(&m->options[4], DHCPDISCOVER);
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| 186 | end = add_req_options(end);
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| 187 | end = add_end(end);
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| 188 |
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| 189 | uip_send(uip_appdata, end - (u8_t *)uip_appdata);
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| 190 | }
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| 191 | /*---------------------------------------------------------------------------*/
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| 192 | static void
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| 193 | send_request(struct dhcpc_state *s)
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| 194 | {
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| 195 | u8_t *end;
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| 196 | struct dhcp_msg *m = (struct dhcp_msg *)uip_appdata;
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| 197 |
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| 198 | create_msg(s, m);
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| 199 |
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| 200 | end = add_msg_type(&m->options[4], DHCPREQUEST);
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| 201 | end = add_server_id(s, end);
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| 202 | end = add_req_ipaddr(s, end);
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| 203 | end = add_end(end);
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| 204 |
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| 205 | uip_send(uip_appdata, end - (u8_t *)uip_appdata);
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| 206 | }
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| 207 | /*---------------------------------------------------------------------------*/
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| 208 | static u8_t
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| 209 | parse_options(struct dhcpc_state *s, u8_t *optptr, int len)
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| 210 | {
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| 211 | u8_t *end = optptr + len;
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| 212 | u8_t type = 0;
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| 213 |
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| 214 | while(optptr < end) {
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| 215 | switch(*optptr) {
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| 216 | case DHCP_OPTION_SUBNET_MASK:
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| 217 | memcpy(s->netmask, optptr + 2, 4);
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| 218 | break;
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| 219 | case DHCP_OPTION_ROUTER:
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| 220 | memcpy(s->default_router, optptr + 2, 4);
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| 221 | break;
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| 222 | case DHCP_OPTION_DNS_SERVER:
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| 223 | memcpy(s->dnsaddr, optptr + 2, 4);
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| 224 | break;
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| 225 | case DHCP_OPTION_MSG_TYPE:
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| 226 | type = *(optptr + 2);
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| 227 | break;
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| 228 | case DHCP_OPTION_SERVER_ID:
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| 229 | memcpy(s->serverid, optptr + 2, 4);
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| 230 | break;
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| 231 | case DHCP_OPTION_LEASE_TIME:
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| 232 | memcpy(s->lease_time, optptr + 2, 4);
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| 233 | break;
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| 234 | case DHCP_OPTION_END:
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| 235 | return type;
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| 236 | }
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| 237 |
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| 238 | optptr += optptr[1] + 2;
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| 239 | }
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| 240 | return type;
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| 241 | }
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| 242 | /*---------------------------------------------------------------------------*/
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| 243 | static u8_t
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| 244 | parse_msg(struct dhcpc_state *s)
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| 245 | {
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| 246 | struct dhcp_msg *m = (struct dhcp_msg *)uip_appdata;
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| 247 |
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| 248 | if(m->op == DHCP_REPLY &&
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| 249 | memcmp(m->xid, xid, sizeof(xid)) == 0 &&
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| 250 | memcmp(m->chaddr, s->mac_addr, s->mac_len) == 0) {
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| 251 | memcpy(s->ipaddr, m->yiaddr, 4);
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| 252 | return parse_options(s, &m->options[4], uip_datalen());
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| 253 | }
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| 254 | return 0;
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| 255 | }
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| 256 | /*---------------------------------------------------------------------------*/
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| 257 | static
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| 258 | PT_THREAD(handle_dhcp(struct dhcpc_state *s))
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| 259 | {
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| 260 | int ret;
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| 261 | PT_BEGIN(&s->pt);
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| 262 |
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| 263 | /* try_again:*/
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| 264 | s->state = STATE_SENDING;
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| 265 | s->ticks = 5 * CLOCK_SECOND;
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| 266 |
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| 267 | send_discover(s);
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| 268 | timer_set(&s->timer, s->ticks);
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| 269 |
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| 270 | do {
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| 271 | PT_WAIT_UNTIL(&s->pt, (ret = uip_newdata() ? 1 : (timer_expired(&s->timer) ? 2 : 0)) != 0);
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| 272 |
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| 273 | if((ret == 1) && parse_msg(s) == DHCPOFFER) {
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| 274 | s->state = STATE_OFFER_RECEIVED;
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| 275 | break;
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| 276 | }
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| 277 | if(ret != 2)
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| 278 | continue;
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| 279 |
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| 280 | if(s->ticks < CLOCK_SECOND * 60) {
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| 281 | s->ticks += CLOCK_SECOND;
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| 282 | }
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| 283 | timer_set(&s->timer, s->ticks);
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| 284 | } while(s->state != STATE_OFFER_RECEIVED);
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| 285 |
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| 286 | s->ticks = CLOCK_SECOND;
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| 287 |
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| 288 | PT_YIELD(&s->pt);
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| 289 |
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| 290 | send_request(s);
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| 291 | timer_set(&s->timer, s->ticks);
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| 292 |
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| 293 | do {
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| 294 | PT_WAIT_UNTIL(&s->pt, (ret = uip_newdata() ? 1 : (timer_expired(&s->timer) ? 2 : 0)) != 0);
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| 295 |
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| 296 | if((ret == 1) && parse_msg(s) == DHCPACK) {
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| 297 | s->state = STATE_CONFIG_RECEIVED;
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| 298 | break;
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| 299 | }
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| 300 | if(ret != 2)
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| 301 | continue;
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| 302 |
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| 303 | if(s->ticks <= CLOCK_SECOND * 60) {
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| 304 | s->ticks += CLOCK_SECOND;
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| 305 | timer_set(&s->timer, s->ticks);
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| 306 | } else {
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| 307 | PT_RESTART(&s->pt);
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| 308 | }
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| 309 | } while(s->state != STATE_CONFIG_RECEIVED);
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| 310 |
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| 311 | #if 0
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| 312 | printf("Got IP address %d.%d.%d.%d\n",
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| 313 | uip_ipaddr1(s->ipaddr), uip_ipaddr2(s->ipaddr),
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| 314 | uip_ipaddr3(s->ipaddr), uip_ipaddr4(s->ipaddr));
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| 315 | printf("Got netmask %d.%d.%d.%d\n",
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| 316 | uip_ipaddr1(s->netmask), uip_ipaddr2(s->netmask),
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| 317 | uip_ipaddr3(s->netmask), uip_ipaddr4(s->netmask));
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| 318 | printf("Got DNS server %d.%d.%d.%d\n",
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| 319 | uip_ipaddr1(s->dnsaddr), uip_ipaddr2(s->dnsaddr),
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| 320 | uip_ipaddr3(s->dnsaddr), uip_ipaddr4(s->dnsaddr));
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| 321 | printf("Got default router %d.%d.%d.%d\n",
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| 322 | uip_ipaddr1(s->default_router), uip_ipaddr2(s->default_router),
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| 323 | uip_ipaddr3(s->default_router), uip_ipaddr4(s->default_router));
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| 324 | printf("Lease expires in %ld seconds\n",
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| 325 | ntohs(s->lease_time[0])*65536ul + ntohs(s->lease_time[1]));
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| 326 | #endif
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| 327 |
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| 328 | dhcpc_configured(s);
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| 329 |
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| 330 | /* timer_stop(&s->timer);*/
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| 331 |
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| 332 | /*
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| 333 | * PT_END restarts the thread so we do this instead. Eventually we
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| 334 | * should reacquire expired leases here.
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| 335 | */
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| 336 | while(1) {
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| 337 | PT_YIELD(&s->pt);
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| 338 | if(s->state == STATE_INITIAL)
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| 339 | PT_RESTART(&s->pt);
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| 340 | }
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| 341 |
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| 342 | PT_END(&s->pt);
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| 343 | }
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| 344 | /*---------------------------------------------------------------------------*/
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| 345 | struct dhcpc_state *
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| 346 | dhcpc_init(const void *mac_addr, int mac_len)
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| 347 | {
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| 348 | struct uip_udp_conn *conn;
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| 349 | struct dhcpc_state *s;
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| 350 | uip_ipaddr_t addr;
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| 351 |
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| 352 | uip_ipaddr(addr, 255,255,255,255);
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| 353 | conn = uip_udp_new(&addr, HTONS(DHCPC_SERVER_PORT));
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| 354 | if(conn != NULL) {
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| 355 | s = &conn->appstate.parblk.dhcpc;
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| 356 | s->conn = conn;
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| 357 | s->mac_addr = mac_addr;
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| 358 | s->mac_len = mac_len;
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| 359 |
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| 360 | s->state = STATE_INITIAL;
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| 361 | s->conn->appstate.udp_callback = dhcpc_appcall;
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| 362 |
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| 363 | uip_udp_bind(conn, HTONS(DHCPC_CLIENT_PORT));
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| 364 |
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| 365 | PT_INIT(&s->pt);
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| 366 |
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| 367 | return s;
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| 368 | }
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| 369 |
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| 370 | return NULL;
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| 371 | }
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| 372 | /*---------------------------------------------------------------------------*/
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| 373 | void
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| 374 | dhcpc_appcall(struct uip_udp_conn *uip_udp_conn, int fncd, void *p_parblk)
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| 375 | {
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| 376 | handle_dhcp((struct dhcpc_state *)p_parblk);
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| 377 | }
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| 378 | /*---------------------------------------------------------------------------*/
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| 379 | void
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| 380 | dhcpc_request(struct dhcpc_state *s)
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| 381 | {
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| 382 | u16_t ipaddr[2];
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| 383 |
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| 384 | s->state = STATE_INITIAL;
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| 385 | uip_ipaddr(ipaddr, 0,0,0,0);
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| 386 | uip_sethostaddr(ipaddr);
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| 387 | uip_udp_conn = s->conn;
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| 388 | uip_process(UIP_UDP_TIMER);
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| 389 | }
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| 390 | /*---------------------------------------------------------------------------*/
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