Pascal Nysten / lwip

Adapted to Lora Semtech + Nucleo

Dependencies:   DebugLib

Dependents:   LoRaWAN-lmic-app LoRaWAN-lmic-app LoRaWAN-test-10secs LoRaPersonalizedDeviceForEverynet ... more

Fork of lwip_ppp_ethernet by Donatien Garnier

src/core/dhcp.c@3:a9e6ba815945, 2015-11-20 (annotated)

Committer:
pnysten
Date:
Fri Nov 20 12:30:58 2015 +0000
Revision:
3:a9e6ba815945
Parent:
0:8e01dca41002 
Adapted to Nucleo, LoRa Semtech

Who changed what in which revision?

UserRevisionLine numberNew contents of line
donatien 0:8e01dca41002 1 /**
donatien 0:8e01dca41002 2 * @file
donatien 0:8e01dca41002 3 * Dynamic Host Configuration Protocol client
donatien 0:8e01dca41002 4 *
donatien 0:8e01dca41002 5 */
donatien 0:8e01dca41002 6
donatien 0:8e01dca41002 7 /*
donatien 0:8e01dca41002 8 *
donatien 0:8e01dca41002 9 * Copyright (c) 2001-2004 Leon Woestenberg <leon.woestenberg@gmx.net>
donatien 0:8e01dca41002 10 * Copyright (c) 2001-2004 Axon Digital Design B.V., The Netherlands.
donatien 0:8e01dca41002 11 * All rights reserved.
donatien 0:8e01dca41002 12 *
donatien 0:8e01dca41002 13 * Redistribution and use in source and binary forms, with or without modification,
donatien 0:8e01dca41002 14 * are permitted provided that the following conditions are met:
donatien 0:8e01dca41002 15 *
donatien 0:8e01dca41002 16 * 1. Redistributions of source code must retain the above copyright notice,
donatien 0:8e01dca41002 17 * this list of conditions and the following disclaimer.
donatien 0:8e01dca41002 18 * 2. Redistributions in binary form must reproduce the above copyright notice,
donatien 0:8e01dca41002 19 * this list of conditions and the following disclaimer in the documentation
donatien 0:8e01dca41002 20 * and/or other materials provided with the distribution.
donatien 0:8e01dca41002 21 * 3. The name of the author may not be used to endorse or promote products
donatien 0:8e01dca41002 22 * derived from this software without specific prior written permission.
donatien 0:8e01dca41002 23 *
donatien 0:8e01dca41002 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
donatien 0:8e01dca41002 25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
donatien 0:8e01dca41002 26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
donatien 0:8e01dca41002 27 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
donatien 0:8e01dca41002 28 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
donatien 0:8e01dca41002 29 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
donatien 0:8e01dca41002 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
donatien 0:8e01dca41002 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
donatien 0:8e01dca41002 32 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
donatien 0:8e01dca41002 33 * OF SUCH DAMAGE.
donatien 0:8e01dca41002 34 *
donatien 0:8e01dca41002 35 * This file is a contribution to the lwIP TCP/IP stack.
donatien 0:8e01dca41002 36 * The Swedish Institute of Computer Science and Adam Dunkels
donatien 0:8e01dca41002 37 * are specifically granted permission to redistribute this
donatien 0:8e01dca41002 38 * source code.
donatien 0:8e01dca41002 39 *
donatien 0:8e01dca41002 40 * Author: Leon Woestenberg <leon.woestenberg@gmx.net>
donatien 0:8e01dca41002 41 *
donatien 0:8e01dca41002 42 * This is a DHCP client for the lwIP TCP/IP stack. It aims to conform
donatien 0:8e01dca41002 43 * with RFC 2131 and RFC 2132.
donatien 0:8e01dca41002 44 *
donatien 0:8e01dca41002 45 * TODO:
donatien 0:8e01dca41002 46 * - Support for interfaces other than Ethernet (SLIP, PPP, ...)
donatien 0:8e01dca41002 47 *
donatien 0:8e01dca41002 48 * Please coordinate changes and requests with Leon Woestenberg
donatien 0:8e01dca41002 49 * <leon.woestenberg@gmx.net>
donatien 0:8e01dca41002 50 *
donatien 0:8e01dca41002 51 * Integration with your code:
donatien 0:8e01dca41002 52 *
donatien 0:8e01dca41002 53 * In lwip/dhcp.h
donatien 0:8e01dca41002 54 * #define DHCP_COARSE_TIMER_SECS (recommended 60 which is a minute)
donatien 0:8e01dca41002 55 * #define DHCP_FINE_TIMER_MSECS (recommended 500 which equals TCP coarse timer)
donatien 0:8e01dca41002 56 *
donatien 0:8e01dca41002 57 * Then have your application call dhcp_coarse_tmr() and
donatien 0:8e01dca41002 58 * dhcp_fine_tmr() on the defined intervals.
donatien 0:8e01dca41002 59 *
donatien 0:8e01dca41002 60 * dhcp_start(struct netif *netif);
donatien 0:8e01dca41002 61 * starts a DHCP client instance which configures the interface by
donatien 0:8e01dca41002 62 * obtaining an IP address lease and maintaining it.
donatien 0:8e01dca41002 63 *
donatien 0:8e01dca41002 64 * Use dhcp_release(netif) to end the lease and use dhcp_stop(netif)
donatien 0:8e01dca41002 65 * to remove the DHCP client.
donatien 0:8e01dca41002 66 *
donatien 0:8e01dca41002 67 */
donatien 0:8e01dca41002 68
donatien 0:8e01dca41002 69 #include "lwip/opt.h"
donatien 0:8e01dca41002 70
donatien 0:8e01dca41002 71 #if LWIP_DHCP /* don't build if not configured for use in lwipopts.h */
donatien 0:8e01dca41002 72
donatien 0:8e01dca41002 73 #include "lwip/stats.h"
donatien 0:8e01dca41002 74 #include "lwip/mem.h"
donatien 0:8e01dca41002 75 #include "lwip/udp.h"
donatien 0:8e01dca41002 76 #include "lwip/ip_addr.h"
donatien 0:8e01dca41002 77 #include "lwip/netif.h"
donatien 0:8e01dca41002 78 #include "lwip/def.h"
donatien 0:8e01dca41002 79 #include "lwip/sys.h"
donatien 0:8e01dca41002 80 #include "lwip/dhcp.h"
donatien 0:8e01dca41002 81 #include "lwip/autoip.h"
donatien 0:8e01dca41002 82 #include "lwip/dns.h"
donatien 0:8e01dca41002 83 #include "netif/etharp.h"
donatien 0:8e01dca41002 84
donatien 0:8e01dca41002 85 #include <string.h>
donatien 0:8e01dca41002 86
donatien 0:8e01dca41002 87 /** Default for DHCP_GLOBAL_XID is 0xABCD0000
donatien 0:8e01dca41002 88 * This can be changed by defining DHCP_GLOBAL_XID and DHCP_GLOBAL_XID_HEADER, e.g.
donatien 0:8e01dca41002 89 * #define DHCP_GLOBAL_XID_HEADER "stdlib.h"
donatien 0:8e01dca41002 90 * #define DHCP_GLOBAL_XID rand()
donatien 0:8e01dca41002 91 */
donatien 0:8e01dca41002 92 #ifdef DHCP_GLOBAL_XID_HEADER
donatien 0:8e01dca41002 93 #include DHCP_GLOBAL_XID_HEADER /* include optional starting XID generation prototypes */
donatien 0:8e01dca41002 94 #endif
donatien 0:8e01dca41002 95
donatien 0:8e01dca41002 96 /** DHCP_OPTION_MAX_MSG_SIZE is set to the MTU
donatien 0:8e01dca41002 97 * MTU is checked to be big enough in dhcp_start */
donatien 0:8e01dca41002 98 #define DHCP_MAX_MSG_LEN(netif) (netif->mtu)
donatien 0:8e01dca41002 99 #define DHCP_MAX_MSG_LEN_MIN_REQUIRED 576
donatien 0:8e01dca41002 100 /** Minimum length for reply before packet is parsed */
donatien 0:8e01dca41002 101 #define DHCP_MIN_REPLY_LEN 44
donatien 0:8e01dca41002 102
donatien 0:8e01dca41002 103 #define REBOOT_TRIES 2
donatien 0:8e01dca41002 104
donatien 0:8e01dca41002 105 /** Option handling: options are parsed in dhcp_parse_reply
donatien 0:8e01dca41002 106 * and saved in an array where other functions can load them from.
donatien 0:8e01dca41002 107 * This might be moved into the struct dhcp (not necessarily since
donatien 0:8e01dca41002 108 * lwIP is single-threaded and the array is only used while in recv
donatien 0:8e01dca41002 109 * callback). */
donatien 0:8e01dca41002 110 #define DHCP_OPTION_IDX_OVERLOAD 0
donatien 0:8e01dca41002 111 #define DHCP_OPTION_IDX_MSG_TYPE 1
donatien 0:8e01dca41002 112 #define DHCP_OPTION_IDX_SERVER_ID 2
donatien 0:8e01dca41002 113 #define DHCP_OPTION_IDX_LEASE_TIME 3
donatien 0:8e01dca41002 114 #define DHCP_OPTION_IDX_T1 4
donatien 0:8e01dca41002 115 #define DHCP_OPTION_IDX_T2 5
donatien 0:8e01dca41002 116 #define DHCP_OPTION_IDX_SUBNET_MASK 6
donatien 0:8e01dca41002 117 #define DHCP_OPTION_IDX_ROUTER 7
donatien 0:8e01dca41002 118 #define DHCP_OPTION_IDX_DNS_SERVER 8
donatien 0:8e01dca41002 119 #define DHCP_OPTION_IDX_MAX (DHCP_OPTION_IDX_DNS_SERVER + DNS_MAX_SERVERS)
donatien 0:8e01dca41002 120
donatien 0:8e01dca41002 121 /** Holds the decoded option values, only valid while in dhcp_recv.
donatien 0:8e01dca41002 122 @todo: move this into struct dhcp? */
donatien 0:8e01dca41002 123 u32_t dhcp_rx_options_val[DHCP_OPTION_IDX_MAX];
donatien 0:8e01dca41002 124 /** Holds a flag which option was received and is contained in dhcp_rx_options_val,
donatien 0:8e01dca41002 125 only valid while in dhcp_recv.
donatien 0:8e01dca41002 126 @todo: move this into struct dhcp? */
donatien 0:8e01dca41002 127 u8_t dhcp_rx_options_given[DHCP_OPTION_IDX_MAX];
donatien 0:8e01dca41002 128
donatien 0:8e01dca41002 129 #define dhcp_option_given(dhcp, idx) (dhcp_rx_options_given[idx] != 0)
donatien 0:8e01dca41002 130 #define dhcp_got_option(dhcp, idx) (dhcp_rx_options_given[idx] = 1)
donatien 0:8e01dca41002 131 #define dhcp_clear_option(dhcp, idx) (dhcp_rx_options_given[idx] = 0)
donatien 0:8e01dca41002 132 #define dhcp_clear_all_options(dhcp) (memset(dhcp_rx_options_given, 0, sizeof(dhcp_rx_options_given)))
donatien 0:8e01dca41002 133 #define dhcp_get_option_value(dhcp, idx) (dhcp_rx_options_val[idx])
donatien 0:8e01dca41002 134 #define dhcp_set_option_value(dhcp, idx, val) (dhcp_rx_options_val[idx] = (val))
donatien 0:8e01dca41002 135
donatien 0:8e01dca41002 136
donatien 0:8e01dca41002 137 /* DHCP client state machine functions */
donatien 0:8e01dca41002 138 static err_t dhcp_discover(struct netif *netif);
donatien 0:8e01dca41002 139 static err_t dhcp_select(struct netif *netif);
donatien 0:8e01dca41002 140 static void dhcp_bind(struct netif *netif);
donatien 0:8e01dca41002 141 #if DHCP_DOES_ARP_CHECK
donatien 0:8e01dca41002 142 static err_t dhcp_decline(struct netif *netif);
donatien 0:8e01dca41002 143 #endif /* DHCP_DOES_ARP_CHECK */
donatien 0:8e01dca41002 144 static err_t dhcp_rebind(struct netif *netif);
donatien 0:8e01dca41002 145 static err_t dhcp_reboot(struct netif *netif);
donatien 0:8e01dca41002 146 static void dhcp_set_state(struct dhcp *dhcp, u8_t new_state);
donatien 0:8e01dca41002 147
donatien 0:8e01dca41002 148 /* receive, unfold, parse and free incoming messages */
donatien 0:8e01dca41002 149 static void dhcp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port);
donatien 0:8e01dca41002 150
donatien 0:8e01dca41002 151 /* set the DHCP timers */
donatien 0:8e01dca41002 152 static void dhcp_timeout(struct netif *netif);
donatien 0:8e01dca41002 153 static void dhcp_t1_timeout(struct netif *netif);
donatien 0:8e01dca41002 154 static void dhcp_t2_timeout(struct netif *netif);
donatien 0:8e01dca41002 155
donatien 0:8e01dca41002 156 /* build outgoing messages */
donatien 0:8e01dca41002 157 /* create a DHCP message, fill in common headers */
donatien 0:8e01dca41002 158 static err_t dhcp_create_msg(struct netif *netif, struct dhcp *dhcp, u8_t message_type);
donatien 0:8e01dca41002 159 /* free a DHCP request */
donatien 0:8e01dca41002 160 static void dhcp_delete_msg(struct dhcp *dhcp);
donatien 0:8e01dca41002 161 /* add a DHCP option (type, then length in bytes) */
donatien 0:8e01dca41002 162 static void dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len);
donatien 0:8e01dca41002 163 /* add option values */
donatien 0:8e01dca41002 164 static void dhcp_option_byte(struct dhcp *dhcp, u8_t value);
donatien 0:8e01dca41002 165 static void dhcp_option_short(struct dhcp *dhcp, u16_t value);
donatien 0:8e01dca41002 166 static void dhcp_option_long(struct dhcp *dhcp, u32_t value);
donatien 0:8e01dca41002 167 /* always add the DHCP options trailer to end and pad */
donatien 0:8e01dca41002 168 static void dhcp_option_trailer(struct dhcp *dhcp);
donatien 0:8e01dca41002 169
donatien 0:8e01dca41002 170 /**
donatien 0:8e01dca41002 171 * Back-off the DHCP client (because of a received NAK response).
donatien 0:8e01dca41002 172 *
donatien 0:8e01dca41002 173 * Back-off the DHCP client because of a received NAK. Receiving a
donatien 0:8e01dca41002 174 * NAK means the client asked for something non-sensible, for
donatien 0:8e01dca41002 175 * example when it tries to renew a lease obtained on another network.
donatien 0:8e01dca41002 176 *
donatien 0:8e01dca41002 177 * We clear any existing set IP address and restart DHCP negotiation
donatien 0:8e01dca41002 178 * afresh (as per RFC2131 3.2.3).
donatien 0:8e01dca41002 179 *
donatien 0:8e01dca41002 180 * @param netif the netif under DHCP control
donatien 0:8e01dca41002 181 */
donatien 0:8e01dca41002 182 static void
donatien 0:8e01dca41002 183 dhcp_handle_nak(struct netif *netif)
donatien 0:8e01dca41002 184 {
donatien 0:8e01dca41002 185 struct dhcp *dhcp = netif->dhcp;
donatien 0:8e01dca41002 186 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_handle_nak(netif=%p) %c%c%"U16_F"\n",
donatien 0:8e01dca41002 187 (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
donatien 0:8e01dca41002 188 /* Set the interface down since the address must no longer be used, as per RFC2131 */
donatien 0:8e01dca41002 189 netif_set_down(netif);
donatien 0:8e01dca41002 190 /* remove IP address from interface */
donatien 0:8e01dca41002 191 netif_set_ipaddr(netif, IP_ADDR_ANY);
donatien 0:8e01dca41002 192 netif_set_gw(netif, IP_ADDR_ANY);
donatien 0:8e01dca41002 193 netif_set_netmask(netif, IP_ADDR_ANY);
donatien 0:8e01dca41002 194 /* Change to a defined state */
donatien 0:8e01dca41002 195 dhcp_set_state(dhcp, DHCP_BACKING_OFF);
donatien 0:8e01dca41002 196 /* We can immediately restart discovery */
donatien 0:8e01dca41002 197 dhcp_discover(netif);
donatien 0:8e01dca41002 198 }
donatien 0:8e01dca41002 199
donatien 0:8e01dca41002 200 #if DHCP_DOES_ARP_CHECK
donatien 0:8e01dca41002 201 /**
donatien 0:8e01dca41002 202 * Checks if the offered IP address is already in use.
donatien 0:8e01dca41002 203 *
donatien 0:8e01dca41002 204 * It does so by sending an ARP request for the offered address and
donatien 0:8e01dca41002 205 * entering CHECKING state. If no ARP reply is received within a small
donatien 0:8e01dca41002 206 * interval, the address is assumed to be free for use by us.
donatien 0:8e01dca41002 207 *
donatien 0:8e01dca41002 208 * @param netif the netif under DHCP control
donatien 0:8e01dca41002 209 */
donatien 0:8e01dca41002 210 static void
donatien 0:8e01dca41002 211 dhcp_check(struct netif *netif)
donatien 0:8e01dca41002 212 {
donatien 0:8e01dca41002 213 struct dhcp *dhcp = netif->dhcp;
donatien 0:8e01dca41002 214 err_t result;
donatien 0:8e01dca41002 215 u16_t msecs;
donatien 0:8e01dca41002 216 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_check(netif=%p) %c%c\n", (void *)netif, (s16_t)netif->name[0],
donatien 0:8e01dca41002 217 (s16_t)netif->name[1]));
donatien 0:8e01dca41002 218 dhcp_set_state(dhcp, DHCP_CHECKING);
donatien 0:8e01dca41002 219 /* create an ARP query for the offered IP address, expecting that no host
donatien 0:8e01dca41002 220 responds, as the IP address should not be in use. */
donatien 0:8e01dca41002 221 result = etharp_query(netif, &dhcp->offered_ip_addr, NULL);
donatien 0:8e01dca41002 222 if (result != ERR_OK) {
donatien 0:8e01dca41002 223 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("dhcp_check: could not perform ARP query\n"));
donatien 0:8e01dca41002 224 }
donatien 0:8e01dca41002 225 dhcp->tries++;
donatien 0:8e01dca41002 226 msecs = 500;
donatien 0:8e01dca41002 227 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
donatien 0:8e01dca41002 228 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_check(): set request timeout %"U16_F" msecs\n", msecs));
donatien 0:8e01dca41002 229 }
donatien 0:8e01dca41002 230 #endif /* DHCP_DOES_ARP_CHECK */
donatien 0:8e01dca41002 231
donatien 0:8e01dca41002 232 /**
donatien 0:8e01dca41002 233 * Remember the configuration offered by a DHCP server.
donatien 0:8e01dca41002 234 *
donatien 0:8e01dca41002 235 * @param netif the netif under DHCP control
donatien 0:8e01dca41002 236 */
donatien 0:8e01dca41002 237 static void
donatien 0:8e01dca41002 238 dhcp_handle_offer(struct netif *netif)
donatien 0:8e01dca41002 239 {
donatien 0:8e01dca41002 240 struct dhcp *dhcp = netif->dhcp;
donatien 0:8e01dca41002 241 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_handle_offer(netif=%p) %c%c%"U16_F"\n",
donatien 0:8e01dca41002 242 (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
donatien 0:8e01dca41002 243 /* obtain the server address */
donatien 0:8e01dca41002 244 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SERVER_ID)) {
donatien 0:8e01dca41002 245 ip4_addr_set_u32(&dhcp->server_ip_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SERVER_ID)));
donatien 0:8e01dca41002 246 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_handle_offer(): server 0x%08"X32_F"\n",
donatien 0:8e01dca41002 247 ip4_addr_get_u32(&dhcp->server_ip_addr)));
donatien 0:8e01dca41002 248 /* remember offered address */
donatien 0:8e01dca41002 249 ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
donatien 0:8e01dca41002 250 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_handle_offer(): offer for 0x%08"X32_F"\n",
donatien 0:8e01dca41002 251 ip4_addr_get_u32(&dhcp->offered_ip_addr)));
donatien 0:8e01dca41002 252
donatien 0:8e01dca41002 253 dhcp_select(netif);
donatien 0:8e01dca41002 254 } else {
donatien 0:8e01dca41002 255 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
donatien 0:8e01dca41002 256 ("dhcp_handle_offer(netif=%p) did not get server ID!\n", (void*)netif));
donatien 0:8e01dca41002 257 }
donatien 0:8e01dca41002 258 }
donatien 0:8e01dca41002 259
donatien 0:8e01dca41002 260 /**
donatien 0:8e01dca41002 261 * Select a DHCP server offer out of all offers.
donatien 0:8e01dca41002 262 *
donatien 0:8e01dca41002 263 * Simply select the first offer received.
donatien 0:8e01dca41002 264 *
donatien 0:8e01dca41002 265 * @param netif the netif under DHCP control
donatien 0:8e01dca41002 266 * @return lwIP specific error (see error.h)
donatien 0:8e01dca41002 267 */
donatien 0:8e01dca41002 268 static err_t
donatien 0:8e01dca41002 269 dhcp_select(struct netif *netif)
donatien 0:8e01dca41002 270 {
donatien 0:8e01dca41002 271 struct dhcp *dhcp = netif->dhcp;
donatien 0:8e01dca41002 272 err_t result;
donatien 0:8e01dca41002 273 u16_t msecs;
donatien 0:8e01dca41002 274
donatien 0:8e01dca41002 275 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));
donatien 0:8e01dca41002 276 dhcp_set_state(dhcp, DHCP_REQUESTING);
donatien 0:8e01dca41002 277
donatien 0:8e01dca41002 278 /* create and initialize the DHCP message header */
donatien 0:8e01dca41002 279 result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
donatien 0:8e01dca41002 280 if (result == ERR_OK) {
donatien 0:8e01dca41002 281 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
donatien 0:8e01dca41002 282 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
donatien 0:8e01dca41002 283
donatien 0:8e01dca41002 284 /* MUST request the offered IP address */
donatien 0:8e01dca41002 285 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
donatien 0:8e01dca41002 286 dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
donatien 0:8e01dca41002 287
donatien 0:8e01dca41002 288 dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
donatien 0:8e01dca41002 289 dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->server_ip_addr)));
donatien 0:8e01dca41002 290
donatien 0:8e01dca41002 291 dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);
donatien 0:8e01dca41002 292 dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
donatien 0:8e01dca41002 293 dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
donatien 0:8e01dca41002 294 dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
donatien 0:8e01dca41002 295 dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
donatien 0:8e01dca41002 296
donatien 0:8e01dca41002 297 #if LWIP_NETIF_HOSTNAME
donatien 0:8e01dca41002 298 if (netif->hostname != NULL) {
donatien 0:8e01dca41002 299 const char *p = (const char*)netif->hostname;
donatien 0:8e01dca41002 300 u8_t namelen = (u8_t)strlen(p);
donatien 0:8e01dca41002 301 if (namelen > 0) {
donatien 0:8e01dca41002 302 LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
donatien 0:8e01dca41002 303 dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
donatien 0:8e01dca41002 304 while (*p) {
donatien 0:8e01dca41002 305 dhcp_option_byte(dhcp, *p++);
donatien 0:8e01dca41002 306 }
donatien 0:8e01dca41002 307 }
donatien 0:8e01dca41002 308 }
donatien 0:8e01dca41002 309 #endif /* LWIP_NETIF_HOSTNAME */
donatien 0:8e01dca41002 310
donatien 0:8e01dca41002 311 dhcp_option_trailer(dhcp);
donatien 0:8e01dca41002 312 /* shrink the pbuf to the actual content length */
donatien 0:8e01dca41002 313 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
donatien 0:8e01dca41002 314
donatien 0:8e01dca41002 315 /* send broadcast to any DHCP server */
donatien 0:8e01dca41002 316 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
donatien 0:8e01dca41002 317 dhcp_delete_msg(dhcp);
donatien 0:8e01dca41002 318 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_select: REQUESTING\n"));
donatien 0:8e01dca41002 319 } else {
donatien 0:8e01dca41002 320 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("dhcp_select: could not allocate DHCP request\n"));
donatien 0:8e01dca41002 321 }
donatien 0:8e01dca41002 322 dhcp->tries++;
donatien 0:8e01dca41002 323 msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
donatien 0:8e01dca41002 324 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
donatien 0:8e01dca41002 325 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_select(): set request timeout %"U16_F" msecs\n", msecs));
donatien 0:8e01dca41002 326 return result;
donatien 0:8e01dca41002 327 }
donatien 0:8e01dca41002 328
donatien 0:8e01dca41002 329 /**
donatien 0:8e01dca41002 330 * The DHCP timer that checks for lease renewal/rebind timeouts.
donatien 0:8e01dca41002 331 */
donatien 0:8e01dca41002 332 void
donatien 0:8e01dca41002 333 dhcp_coarse_tmr()
donatien 0:8e01dca41002 334 {
donatien 0:8e01dca41002 335 struct netif *netif = netif_list;
donatien 0:8e01dca41002 336 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_coarse_tmr()\n"));
donatien 0:8e01dca41002 337 /* iterate through all network interfaces */
donatien 0:8e01dca41002 338 while (netif != NULL) {
donatien 0:8e01dca41002 339 /* only act on DHCP configured interfaces */
donatien 0:8e01dca41002 340 if (netif->dhcp != NULL) {
donatien 0:8e01dca41002 341 /* timer is active (non zero), and triggers (zeroes) now? */
donatien 0:8e01dca41002 342 if (netif->dhcp->t2_timeout-- == 1) {
donatien 0:8e01dca41002 343 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t2 timeout\n"));
donatien 0:8e01dca41002 344 /* this clients' rebind timeout triggered */
donatien 0:8e01dca41002 345 dhcp_t2_timeout(netif);
donatien 0:8e01dca41002 346 /* timer is active (non zero), and triggers (zeroes) now */
donatien 0:8e01dca41002 347 } else if (netif->dhcp->t1_timeout-- == 1) {
donatien 0:8e01dca41002 348 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t1 timeout\n"));
donatien 0:8e01dca41002 349 /* this clients' renewal timeout triggered */
donatien 0:8e01dca41002 350 dhcp_t1_timeout(netif);
donatien 0:8e01dca41002 351 }
donatien 0:8e01dca41002 352 }
donatien 0:8e01dca41002 353 /* proceed to next netif */
donatien 0:8e01dca41002 354 netif = netif->next;
donatien 0:8e01dca41002 355 }
donatien 0:8e01dca41002 356 }
donatien 0:8e01dca41002 357
donatien 0:8e01dca41002 358 /**
donatien 0:8e01dca41002 359 * DHCP transaction timeout handling
donatien 0:8e01dca41002 360 *
donatien 0:8e01dca41002 361 * A DHCP server is expected to respond within a short period of time.
donatien 0:8e01dca41002 362 * This timer checks whether an outstanding DHCP request is timed out.
donatien 0:8e01dca41002 363 */
donatien 0:8e01dca41002 364 void
donatien 0:8e01dca41002 365 dhcp_fine_tmr()
donatien 0:8e01dca41002 366 {
donatien 0:8e01dca41002 367 struct netif *netif = netif_list;
donatien 0:8e01dca41002 368 /* loop through netif's */
donatien 0:8e01dca41002 369 while (netif != NULL) {
donatien 0:8e01dca41002 370 /* only act on DHCP configured interfaces */
donatien 0:8e01dca41002 371 if (netif->dhcp != NULL) {
donatien 0:8e01dca41002 372 /* timer is active (non zero), and is about to trigger now */
donatien 0:8e01dca41002 373 if (netif->dhcp->request_timeout > 1) {
donatien 0:8e01dca41002 374 netif->dhcp->request_timeout--;
donatien 0:8e01dca41002 375 }
donatien 0:8e01dca41002 376 else if (netif->dhcp->request_timeout == 1) {
donatien 0:8e01dca41002 377 netif->dhcp->request_timeout--;
donatien 0:8e01dca41002 378 /* { netif->dhcp->request_timeout == 0 } */
donatien 0:8e01dca41002 379 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_fine_tmr(): request timeout\n"));
donatien 0:8e01dca41002 380 /* this client's request timeout triggered */
donatien 0:8e01dca41002 381 dhcp_timeout(netif);
donatien 0:8e01dca41002 382 }
donatien 0:8e01dca41002 383 }
donatien 0:8e01dca41002 384 /* proceed to next network interface */
donatien 0:8e01dca41002 385 netif = netif->next;
donatien 0:8e01dca41002 386 }
donatien 0:8e01dca41002 387 }
donatien 0:8e01dca41002 388
donatien 0:8e01dca41002 389 /**
donatien 0:8e01dca41002 390 * A DHCP negotiation transaction, or ARP request, has timed out.
donatien 0:8e01dca41002 391 *
donatien 0:8e01dca41002 392 * The timer that was started with the DHCP or ARP request has
donatien 0:8e01dca41002 393 * timed out, indicating no response was received in time.
donatien 0:8e01dca41002 394 *
donatien 0:8e01dca41002 395 * @param netif the netif under DHCP control
donatien 0:8e01dca41002 396 */
donatien 0:8e01dca41002 397 static void
donatien 0:8e01dca41002 398 dhcp_timeout(struct netif *netif)
donatien 0:8e01dca41002 399 {
donatien 0:8e01dca41002 400 struct dhcp *dhcp = netif->dhcp;
donatien 0:8e01dca41002 401 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_timeout()\n"));
donatien 0:8e01dca41002 402 /* back-off period has passed, or server selection timed out */
donatien 0:8e01dca41002 403 if ((dhcp->state == DHCP_BACKING_OFF) || (dhcp->state == DHCP_SELECTING)) {
donatien 0:8e01dca41002 404 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_timeout(): restarting discovery\n"));
donatien 0:8e01dca41002 405 dhcp_discover(netif);
donatien 0:8e01dca41002 406 /* receiving the requested lease timed out */
donatien 0:8e01dca41002 407 } else if (dhcp->state == DHCP_REQUESTING) {
donatien 0:8e01dca41002 408 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, DHCP request timed out\n"));
donatien 0:8e01dca41002 409 if (dhcp->tries <= 5) {
donatien 0:8e01dca41002 410 dhcp_select(netif);
donatien 0:8e01dca41002 411 } else {
donatien 0:8e01dca41002 412 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, releasing, restarting\n"));
donatien 0:8e01dca41002 413 dhcp_release(netif);
donatien 0:8e01dca41002 414 dhcp_discover(netif);
donatien 0:8e01dca41002 415 }
donatien 0:8e01dca41002 416 #if DHCP_DOES_ARP_CHECK
donatien 0:8e01dca41002 417 /* received no ARP reply for the offered address (which is good) */
donatien 0:8e01dca41002 418 } else if (dhcp->state == DHCP_CHECKING) {
donatien 0:8e01dca41002 419 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): CHECKING, ARP request timed out\n"));
donatien 0:8e01dca41002 420 if (dhcp->tries <= 1) {
donatien 0:8e01dca41002 421 dhcp_check(netif);
donatien 0:8e01dca41002 422 /* no ARP replies on the offered address,
donatien 0:8e01dca41002 423 looks like the IP address is indeed free */
donatien 0:8e01dca41002 424 } else {
donatien 0:8e01dca41002 425 /* bind the interface to the offered address */
donatien 0:8e01dca41002 426 dhcp_bind(netif);
donatien 0:8e01dca41002 427 }
donatien 0:8e01dca41002 428 #endif /* DHCP_DOES_ARP_CHECK */
donatien 0:8e01dca41002 429 }
donatien 0:8e01dca41002 430 /* did not get response to renew request? */
donatien 0:8e01dca41002 431 else if (dhcp->state == DHCP_RENEWING) {
donatien 0:8e01dca41002 432 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): RENEWING, DHCP request timed out\n"));
donatien 0:8e01dca41002 433 /* just retry renewal */
donatien 0:8e01dca41002 434 /* note that the rebind timer will eventually time-out if renew does not work */
donatien 0:8e01dca41002 435 dhcp_renew(netif);
donatien 0:8e01dca41002 436 /* did not get response to rebind request? */
donatien 0:8e01dca41002 437 } else if (dhcp->state == DHCP_REBINDING) {
donatien 0:8e01dca41002 438 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REBINDING, DHCP request timed out\n"));
donatien 0:8e01dca41002 439 if (dhcp->tries <= 8) {
donatien 0:8e01dca41002 440 dhcp_rebind(netif);
donatien 0:8e01dca41002 441 } else {
donatien 0:8e01dca41002 442 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): RELEASING, DISCOVERING\n"));
donatien 0:8e01dca41002 443 dhcp_release(netif);
donatien 0:8e01dca41002 444 dhcp_discover(netif);
donatien 0:8e01dca41002 445 }
donatien 0:8e01dca41002 446 } else if (dhcp->state == DHCP_REBOOTING) {
donatien 0:8e01dca41002 447 if (dhcp->tries < REBOOT_TRIES) {
donatien 0:8e01dca41002 448 dhcp_reboot(netif);
donatien 0:8e01dca41002 449 } else {
donatien 0:8e01dca41002 450 dhcp_discover(netif);
donatien 0:8e01dca41002 451 }
donatien 0:8e01dca41002 452 }
donatien 0:8e01dca41002 453 }
donatien 0:8e01dca41002 454
donatien 0:8e01dca41002 455 /**
donatien 0:8e01dca41002 456 * The renewal period has timed out.
donatien 0:8e01dca41002 457 *
donatien 0:8e01dca41002 458 * @param netif the netif under DHCP control
donatien 0:8e01dca41002 459 */
donatien 0:8e01dca41002 460 static void
donatien 0:8e01dca41002 461 dhcp_t1_timeout(struct netif *netif)
donatien 0:8e01dca41002 462 {
donatien 0:8e01dca41002 463 struct dhcp *dhcp = netif->dhcp;
donatien 0:8e01dca41002 464 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_t1_timeout()\n"));
donatien 0:8e01dca41002 465 if ((dhcp->state == DHCP_REQUESTING) || (dhcp->state == DHCP_BOUND) ||
donatien 0:8e01dca41002 466 (dhcp->state == DHCP_RENEWING)) {
donatien 0:8e01dca41002 467 /* just retry to renew - note that the rebind timer (t2) will
donatien 0:8e01dca41002 468 * eventually time-out if renew tries fail. */
donatien 0:8e01dca41002 469 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
donatien 0:8e01dca41002 470 ("dhcp_t1_timeout(): must renew\n"));
donatien 0:8e01dca41002 471 /* This slightly different to RFC2131: DHCPREQUEST will be sent from state
donatien 0:8e01dca41002 472 DHCP_RENEWING, not DHCP_BOUND */
donatien 0:8e01dca41002 473 dhcp_renew(netif);
donatien 0:8e01dca41002 474 }
donatien 0:8e01dca41002 475 }
donatien 0:8e01dca41002 476
donatien 0:8e01dca41002 477 /**
donatien 0:8e01dca41002 478 * The rebind period has timed out.
donatien 0:8e01dca41002 479 *
donatien 0:8e01dca41002 480 * @param netif the netif under DHCP control
donatien 0:8e01dca41002 481 */
donatien 0:8e01dca41002 482 static void
donatien 0:8e01dca41002 483 dhcp_t2_timeout(struct netif *netif)
donatien 0:8e01dca41002 484 {
donatien 0:8e01dca41002 485 struct dhcp *dhcp = netif->dhcp;
donatien 0:8e01dca41002 486 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_t2_timeout()\n"));
donatien 0:8e01dca41002 487 if ((dhcp->state == DHCP_REQUESTING) || (dhcp->state == DHCP_BOUND) ||
donatien 0:8e01dca41002 488 (dhcp->state == DHCP_RENEWING)) {
donatien 0:8e01dca41002 489 /* just retry to rebind */
donatien 0:8e01dca41002 490 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
donatien 0:8e01dca41002 491 ("dhcp_t2_timeout(): must rebind\n"));
donatien 0:8e01dca41002 492 /* This slightly different to RFC2131: DHCPREQUEST will be sent from state
donatien 0:8e01dca41002 493 DHCP_REBINDING, not DHCP_BOUND */
donatien 0:8e01dca41002 494 dhcp_rebind(netif);
donatien 0:8e01dca41002 495 }
donatien 0:8e01dca41002 496 }
donatien 0:8e01dca41002 497
donatien 0:8e01dca41002 498 /**
donatien 0:8e01dca41002 499 * Handle a DHCP ACK packet
donatien 0:8e01dca41002 500 *
donatien 0:8e01dca41002 501 * @param netif the netif under DHCP control
donatien 0:8e01dca41002 502 */
donatien 0:8e01dca41002 503 static void
donatien 0:8e01dca41002 504 dhcp_handle_ack(struct netif *netif)
donatien 0:8e01dca41002 505 {
donatien 0:8e01dca41002 506 struct dhcp *dhcp = netif->dhcp;
donatien 0:8e01dca41002 507 #if LWIP_DNS
donatien 0:8e01dca41002 508 u8_t n;
donatien 0:8e01dca41002 509 #endif /* LWIP_DNS */
donatien 0:8e01dca41002 510
donatien 0:8e01dca41002 511 /* clear options we might not get from the ACK */
donatien 0:8e01dca41002 512 ip_addr_set_zero(&dhcp->offered_sn_mask);
donatien 0:8e01dca41002 513 ip_addr_set_zero(&dhcp->offered_gw_addr);
donatien 0:8e01dca41002 514 #if LWIP_DHCP_BOOTP_FILE
donatien 0:8e01dca41002 515 ip_addr_set_zero(&dhcp->offered_si_addr);
donatien 0:8e01dca41002 516 #endif /* LWIP_DHCP_BOOTP_FILE */
donatien 0:8e01dca41002 517
donatien 0:8e01dca41002 518 /* lease time given? */
donatien 0:8e01dca41002 519 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_LEASE_TIME)) {
donatien 0:8e01dca41002 520 /* remember offered lease time */
donatien 0:8e01dca41002 521 dhcp->offered_t0_lease = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_LEASE_TIME);
donatien 0:8e01dca41002 522 }
donatien 0:8e01dca41002 523 /* renewal period given? */
donatien 0:8e01dca41002 524 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T1)) {
donatien 0:8e01dca41002 525 /* remember given renewal period */
donatien 0:8e01dca41002 526 dhcp->offered_t1_renew = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T1);
donatien 0:8e01dca41002 527 } else {
donatien 0:8e01dca41002 528 /* calculate safe periods for renewal */
donatien 0:8e01dca41002 529 dhcp->offered_t1_renew = dhcp->offered_t0_lease / 2;
donatien 0:8e01dca41002 530 }
donatien 0:8e01dca41002 531
donatien 0:8e01dca41002 532 /* renewal period given? */
donatien 0:8e01dca41002 533 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T2)) {
donatien 0:8e01dca41002 534 /* remember given rebind period */
donatien 0:8e01dca41002 535 dhcp->offered_t2_rebind = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T2);
donatien 0:8e01dca41002 536 } else {
donatien 0:8e01dca41002 537 /* calculate safe periods for rebinding */
donatien 0:8e01dca41002 538 dhcp->offered_t2_rebind = dhcp->offered_t0_lease;
donatien 0:8e01dca41002 539 }
donatien 0:8e01dca41002 540
donatien 0:8e01dca41002 541 /* (y)our internet address */
donatien 0:8e01dca41002 542 ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
donatien 0:8e01dca41002 543
donatien 0:8e01dca41002 544 #if LWIP_DHCP_BOOTP_FILE
donatien 0:8e01dca41002 545 /* copy boot server address,
donatien 0:8e01dca41002 546 boot file name copied in dhcp_parse_reply if not overloaded */
donatien 0:8e01dca41002 547 ip_addr_copy(dhcp->offered_si_addr, dhcp->msg_in->siaddr);
donatien 0:8e01dca41002 548 #endif /* LWIP_DHCP_BOOTP_FILE */
donatien 0:8e01dca41002 549
donatien 0:8e01dca41002 550 /* subnet mask given? */
donatien 0:8e01dca41002 551 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)) {
donatien 0:8e01dca41002 552 /* remember given subnet mask */
donatien 0:8e01dca41002 553 ip4_addr_set_u32(&dhcp->offered_sn_mask, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)));
donatien 0:8e01dca41002 554 dhcp->subnet_mask_given = 1;
donatien 0:8e01dca41002 555 } else {
donatien 0:8e01dca41002 556 dhcp->subnet_mask_given = 0;
donatien 0:8e01dca41002 557 }
donatien 0:8e01dca41002 558
donatien 0:8e01dca41002 559 /* gateway router */
donatien 0:8e01dca41002 560 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_ROUTER)) {
donatien 0:8e01dca41002 561 ip4_addr_set_u32(&dhcp->offered_gw_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_ROUTER)));
donatien 0:8e01dca41002 562 }
donatien 0:8e01dca41002 563
donatien 0:8e01dca41002 564 #if LWIP_DNS
donatien 0:8e01dca41002 565 /* DNS servers */
donatien 0:8e01dca41002 566 n = 0;
donatien 0:8e01dca41002 567 while(dhcp_option_given(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n) && (n < DNS_MAX_SERVERS)) {
donatien 0:8e01dca41002 568 ip_addr_t dns_addr;
donatien 0:8e01dca41002 569 ip4_addr_set_u32(&dns_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n)));
donatien 0:8e01dca41002 570 dns_setserver(n, &dns_addr);
donatien 0:8e01dca41002 571 n++;
donatien 0:8e01dca41002 572 }
donatien 0:8e01dca41002 573 #endif /* LWIP_DNS */
donatien 0:8e01dca41002 574 }
donatien 0:8e01dca41002 575
donatien 0:8e01dca41002 576 /** Set a statically allocated struct dhcp to work with.
donatien 0:8e01dca41002 577 * Using this prevents dhcp_start to allocate it using mem_malloc.
donatien 0:8e01dca41002 578 *
donatien 0:8e01dca41002 579 * @param netif the netif for which to set the struct dhcp
donatien 0:8e01dca41002 580 * @param dhcp (uninitialised) dhcp struct allocated by the application
donatien 0:8e01dca41002 581 */
donatien 0:8e01dca41002 582 void
donatien 0:8e01dca41002 583 dhcp_set_struct(struct netif *netif, struct dhcp *dhcp)
donatien 0:8e01dca41002 584 {
donatien 0:8e01dca41002 585 LWIP_ASSERT("netif != NULL", netif != NULL);
donatien 0:8e01dca41002 586 LWIP_ASSERT("dhcp != NULL", dhcp != NULL);
donatien 0:8e01dca41002 587 LWIP_ASSERT("netif already has a struct dhcp set", netif->dhcp == NULL);
donatien 0:8e01dca41002 588
donatien 0:8e01dca41002 589 /* clear data structure */
donatien 0:8e01dca41002 590 memset(dhcp, 0, sizeof(struct dhcp));
donatien 0:8e01dca41002 591 /* dhcp_set_state(&dhcp, DHCP_OFF); */
donatien 0:8e01dca41002 592 netif->dhcp = dhcp;
donatien 0:8e01dca41002 593 }
donatien 0:8e01dca41002 594
donatien 0:8e01dca41002 595 /** Removes a struct dhcp from a netif.
donatien 0:8e01dca41002 596 *
donatien 0:8e01dca41002 597 * ATTENTION: Only use this when not using dhcp_set_struct() to allocate the
donatien 0:8e01dca41002 598 * struct dhcp since the memory is passed back to the heap.
donatien 0:8e01dca41002 599 *
donatien 0:8e01dca41002 600 * @param netif the netif from which to remove the struct dhcp
donatien 0:8e01dca41002 601 */
donatien 0:8e01dca41002 602 void dhcp_cleanup(struct netif *netif)
donatien 0:8e01dca41002 603 {
donatien 0:8e01dca41002 604 LWIP_ASSERT("netif != NULL", netif != NULL);
donatien 0:8e01dca41002 605
donatien 0:8e01dca41002 606 if (netif->dhcp != NULL) {
donatien 0:8e01dca41002 607 mem_free(netif->dhcp);
donatien 0:8e01dca41002 608 netif->dhcp = NULL;
donatien 0:8e01dca41002 609 }
donatien 0:8e01dca41002 610 }
donatien 0:8e01dca41002 611
donatien 0:8e01dca41002 612 /**
donatien 0:8e01dca41002 613 * Start DHCP negotiation for a network interface.
donatien 0:8e01dca41002 614 *
donatien 0:8e01dca41002 615 * If no DHCP client instance was attached to this interface,
donatien 0:8e01dca41002 616 * a new client is created first. If a DHCP client instance
donatien 0:8e01dca41002 617 * was already present, it restarts negotiation.
donatien 0:8e01dca41002 618 *
donatien 0:8e01dca41002 619 * @param netif The lwIP network interface
donatien 0:8e01dca41002 620 * @return lwIP error code
donatien 0:8e01dca41002 621 * - ERR_OK - No error
donatien 0:8e01dca41002 622 * - ERR_MEM - Out of memory
donatien 0:8e01dca41002 623 */
donatien 0:8e01dca41002 624 err_t
donatien 0:8e01dca41002 625 dhcp_start(struct netif *netif)
donatien 0:8e01dca41002 626 {
donatien 0:8e01dca41002 627 struct dhcp *dhcp;
donatien 0:8e01dca41002 628 err_t result = ERR_OK;
donatien 0:8e01dca41002 629
donatien 0:8e01dca41002 630 LWIP_ERROR("netif != NULL", (netif != NULL), return ERR_ARG;);
donatien 0:8e01dca41002 631 dhcp = netif->dhcp;
donatien 0:8e01dca41002 632 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));
donatien 0:8e01dca41002 633 /* Remove the flag that says this netif is handled by DHCP,
donatien 0:8e01dca41002 634 it is set when we succeeded starting. */
donatien 0:8e01dca41002 635 netif->flags &= ~NETIF_FLAG_DHCP;
donatien 0:8e01dca41002 636
donatien 0:8e01dca41002 637 /* check hwtype of the netif */
donatien 0:8e01dca41002 638 if ((netif->flags & NETIF_FLAG_ETHARP) == 0) {
donatien 0:8e01dca41002 639 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): No ETHARP netif\n"));
donatien 0:8e01dca41002 640 return ERR_ARG;
donatien 0:8e01dca41002 641 }
donatien 0:8e01dca41002 642
donatien 0:8e01dca41002 643 /* check MTU of the netif */
donatien 0:8e01dca41002 644 if (netif->mtu < DHCP_MAX_MSG_LEN_MIN_REQUIRED) {
donatien 0:8e01dca41002 645 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): Cannot use this netif with DHCP: MTU is too small\n"));
donatien 0:8e01dca41002 646 return ERR_MEM;
donatien 0:8e01dca41002 647 }
donatien 0:8e01dca41002 648
donatien 0:8e01dca41002 649 /* no DHCP client attached yet? */
donatien 0:8e01dca41002 650 if (dhcp == NULL) {
donatien 0:8e01dca41002 651 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): starting new DHCP client\n"));
donatien 0:8e01dca41002 652 dhcp = (struct dhcp *)mem_malloc(sizeof(struct dhcp));
donatien 0:8e01dca41002 653 if (dhcp == NULL) {
donatien 0:8e01dca41002 654 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): could not allocate dhcp\n"));
donatien 0:8e01dca41002 655 return ERR_MEM;
donatien 0:8e01dca41002 656 }
donatien 0:8e01dca41002 657 /* store this dhcp client in the netif */
donatien 0:8e01dca41002 658 netif->dhcp = dhcp;
donatien 0:8e01dca41002 659 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): allocated dhcp"));
donatien 0:8e01dca41002 660 /* already has DHCP client attached */
donatien 0:8e01dca41002 661 } else {
donatien 0:8e01dca41002 662 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_start(): restarting DHCP configuration\n"));
donatien 0:8e01dca41002 663 if (dhcp->pcb != NULL) {
donatien 0:8e01dca41002 664 udp_remove(dhcp->pcb);
donatien 0:8e01dca41002 665 }
donatien 0:8e01dca41002 666 LWIP_ASSERT("pbuf p_out wasn't freed", dhcp->p_out == NULL);
donatien 0:8e01dca41002 667 LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL );
donatien 0:8e01dca41002 668 }
donatien 0:8e01dca41002 669
donatien 0:8e01dca41002 670 /* clear data structure */
donatien 0:8e01dca41002 671 memset(dhcp, 0, sizeof(struct dhcp));
donatien 0:8e01dca41002 672 /* dhcp_set_state(&dhcp, DHCP_OFF); */
donatien 0:8e01dca41002 673 /* allocate UDP PCB */
donatien 0:8e01dca41002 674 dhcp->pcb = udp_new();
donatien 0:8e01dca41002 675 if (dhcp->pcb == NULL) {
donatien 0:8e01dca41002 676 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): could not obtain pcb\n"));
donatien 0:8e01dca41002 677 return ERR_MEM;
donatien 0:8e01dca41002 678 }
donatien 0:8e01dca41002 679 dhcp->pcb->so_options |= SOF_BROADCAST;
donatien 0:8e01dca41002 680 /* set up local and remote port for the pcb */
donatien 0:8e01dca41002 681 udp_bind(dhcp->pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
donatien 0:8e01dca41002 682 udp_connect(dhcp->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
donatien 0:8e01dca41002 683 /* set up the recv callback and argument */
donatien 0:8e01dca41002 684 udp_recv(dhcp->pcb, dhcp_recv, netif);
donatien 0:8e01dca41002 685 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): starting DHCP configuration\n"));
donatien 0:8e01dca41002 686 /* (re)start the DHCP negotiation */
donatien 0:8e01dca41002 687 result = dhcp_discover(netif);
donatien 0:8e01dca41002 688 if (result != ERR_OK) {
donatien 0:8e01dca41002 689 /* free resources allocated above */
donatien 0:8e01dca41002 690 dhcp_stop(netif);
donatien 0:8e01dca41002 691 return ERR_MEM;
donatien 0:8e01dca41002 692 }
donatien 0:8e01dca41002 693 /* Set the flag that says this netif is handled by DHCP. */
donatien 0:8e01dca41002 694 netif->flags |= NETIF_FLAG_DHCP;
donatien 0:8e01dca41002 695 return result;
donatien 0:8e01dca41002 696 }
donatien 0:8e01dca41002 697
donatien 0:8e01dca41002 698 /**
donatien 0:8e01dca41002 699 * Inform a DHCP server of our manual configuration.
donatien 0:8e01dca41002 700 *
donatien 0:8e01dca41002 701 * This informs DHCP servers of our fixed IP address configuration
donatien 0:8e01dca41002 702 * by sending an INFORM message. It does not involve DHCP address
donatien 0:8e01dca41002 703 * configuration, it is just here to be nice to the network.
donatien 0:8e01dca41002 704 *
donatien 0:8e01dca41002 705 * @param netif The lwIP network interface
donatien 0:8e01dca41002 706 */
donatien 0:8e01dca41002 707 void
donatien 0:8e01dca41002 708 dhcp_inform(struct netif *netif)
donatien 0:8e01dca41002 709 {
donatien 0:8e01dca41002 710 struct dhcp dhcp;
donatien 0:8e01dca41002 711 err_t result = ERR_OK;
donatien 0:8e01dca41002 712 struct udp_pcb *pcb;
donatien 0:8e01dca41002 713
donatien 0:8e01dca41002 714 LWIP_ERROR("netif != NULL", (netif != NULL), return;);
donatien 0:8e01dca41002 715
donatien 0:8e01dca41002 716 memset(&dhcp, 0, sizeof(struct dhcp));
donatien 0:8e01dca41002 717 dhcp_set_state(&dhcp, DHCP_INFORM);
donatien 0:8e01dca41002 718
donatien 0:8e01dca41002 719 if ((netif->dhcp != NULL) && (netif->dhcp->pcb != NULL)) {
donatien 0:8e01dca41002 720 /* re-use existing pcb */
donatien 0:8e01dca41002 721 pcb = netif->dhcp->pcb;
donatien 0:8e01dca41002 722 } else {
donatien 0:8e01dca41002 723 pcb = udp_new();
donatien 0:8e01dca41002 724 if (pcb == NULL) {
donatien 0:8e01dca41002 725 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform(): could not obtain pcb"));
donatien 0:8e01dca41002 726 return;
donatien 0:8e01dca41002 727 }
donatien 0:8e01dca41002 728 dhcp.pcb = pcb;
donatien 0:8e01dca41002 729 dhcp.pcb->so_options |= SOF_BROADCAST;
donatien 0:8e01dca41002 730 udp_bind(dhcp.pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
donatien 0:8e01dca41002 731 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_inform(): created new udp pcb\n"));
donatien 0:8e01dca41002 732 }
donatien 0:8e01dca41002 733 /* create and initialize the DHCP message header */
donatien 0:8e01dca41002 734 result = dhcp_create_msg(netif, &dhcp, DHCP_INFORM);
donatien 0:8e01dca41002 735 if (result == ERR_OK) {
donatien 0:8e01dca41002 736 dhcp_option(&dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
donatien 0:8e01dca41002 737 dhcp_option_short(&dhcp, DHCP_MAX_MSG_LEN(netif));
donatien 0:8e01dca41002 738
donatien 0:8e01dca41002 739 dhcp_option_trailer(&dhcp);
donatien 0:8e01dca41002 740
donatien 0:8e01dca41002 741 pbuf_realloc(dhcp.p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp.options_out_len);
donatien 0:8e01dca41002 742
donatien 0:8e01dca41002 743 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_inform: INFORMING\n"));
donatien 0:8e01dca41002 744 udp_sendto_if(pcb, dhcp.p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
donatien 0:8e01dca41002 745 dhcp_delete_msg(&dhcp);
donatien 0:8e01dca41002 746 } else {
donatien 0:8e01dca41002 747 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform: could not allocate DHCP request\n"));
donatien 0:8e01dca41002 748 }
donatien 0:8e01dca41002 749
donatien 0:8e01dca41002 750 if (dhcp.pcb != NULL) {
donatien 0:8e01dca41002 751 /* otherwise, the existing pcb was used */
donatien 0:8e01dca41002 752 udp_remove(dhcp.pcb);
donatien 0:8e01dca41002 753 }
donatien 0:8e01dca41002 754 }
donatien 0:8e01dca41002 755
donatien 0:8e01dca41002 756 /** Handle a possible change in the network configuration.
donatien 0:8e01dca41002 757 *
donatien 0:8e01dca41002 758 * This enters the REBOOTING state to verify that the currently bound
donatien 0:8e01dca41002 759 * address is still valid.
donatien 0:8e01dca41002 760 */
donatien 0:8e01dca41002 761 void
donatien 0:8e01dca41002 762 dhcp_network_changed(struct netif *netif)
donatien 0:8e01dca41002 763 {
donatien 0:8e01dca41002 764 struct dhcp *dhcp = netif->dhcp;
donatien 0:8e01dca41002 765 if (!dhcp)
donatien 0:8e01dca41002 766 return;
donatien 0:8e01dca41002 767 switch (dhcp->state) {
donatien 0:8e01dca41002 768 case DHCP_REBINDING:
donatien 0:8e01dca41002 769 case DHCP_RENEWING:
donatien 0:8e01dca41002 770 case DHCP_BOUND:
donatien 0:8e01dca41002 771 case DHCP_REBOOTING:
donatien 0:8e01dca41002 772 netif_set_down(netif);
donatien 0:8e01dca41002 773 dhcp->tries = 0;
donatien 0:8e01dca41002 774 dhcp_reboot(netif);
donatien 0:8e01dca41002 775 break;
donatien 0:8e01dca41002 776 case DHCP_OFF:
donatien 0:8e01dca41002 777 /* stay off */
donatien 0:8e01dca41002 778 break;
donatien 0:8e01dca41002 779 default:
donatien 0:8e01dca41002 780 dhcp->tries = 0;
donatien 0:8e01dca41002 781 #if LWIP_DHCP_AUTOIP_COOP
donatien 0:8e01dca41002 782 if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
donatien 0:8e01dca41002 783 autoip_stop(netif);
donatien 0:8e01dca41002 784 dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
donatien 0:8e01dca41002 785 }
donatien 0:8e01dca41002 786 #endif /* LWIP_DHCP_AUTOIP_COOP */
donatien 0:8e01dca41002 787 dhcp_discover(netif);
donatien 0:8e01dca41002 788 break;
donatien 0:8e01dca41002 789 }
donatien 0:8e01dca41002 790 }
donatien 0:8e01dca41002 791
donatien 0:8e01dca41002 792 #if DHCP_DOES_ARP_CHECK
donatien 0:8e01dca41002 793 /**
donatien 0:8e01dca41002 794 * Match an ARP reply with the offered IP address.
donatien 0:8e01dca41002 795 *
donatien 0:8e01dca41002 796 * @param netif the network interface on which the reply was received
donatien 0:8e01dca41002 797 * @param addr The IP address we received a reply from
donatien 0:8e01dca41002 798 */
donatien 0:8e01dca41002 799 void dhcp_arp_reply(struct netif *netif, ip_addr_t *addr)
donatien 0:8e01dca41002 800 {
donatien 0:8e01dca41002 801 LWIP_ERROR("netif != NULL", (netif != NULL), return;);
donatien 0:8e01dca41002 802 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_arp_reply()\n"));
donatien 0:8e01dca41002 803 /* is a DHCP client doing an ARP check? */
donatien 0:8e01dca41002 804 if ((netif->dhcp != NULL) && (netif->dhcp->state == DHCP_CHECKING)) {
donatien 0:8e01dca41002 805 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_arp_reply(): CHECKING, arp reply for 0x%08"X32_F"\n",
donatien 0:8e01dca41002 806 ip4_addr_get_u32(addr)));
donatien 0:8e01dca41002 807 /* did a host respond with the address we
donatien 0:8e01dca41002 808 were offered by the DHCP server? */
donatien 0:8e01dca41002 809 if (ip_addr_cmp(addr, &netif->dhcp->offered_ip_addr)) {
donatien 0:8e01dca41002 810 /* we will not accept the offered address */
donatien 0:8e01dca41002 811 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING,
donatien 0:8e01dca41002 812 ("dhcp_arp_reply(): arp reply matched with offered address, declining\n"));
donatien 0:8e01dca41002 813 dhcp_decline(netif);
donatien 0:8e01dca41002 814 }
donatien 0:8e01dca41002 815 }
donatien 0:8e01dca41002 816 }
donatien 0:8e01dca41002 817
donatien 0:8e01dca41002 818 /**
donatien 0:8e01dca41002 819 * Decline an offered lease.
donatien 0:8e01dca41002 820 *
donatien 0:8e01dca41002 821 * Tell the DHCP server we do not accept the offered address.
donatien 0:8e01dca41002 822 * One reason to decline the lease is when we find out the address
donatien 0:8e01dca41002 823 * is already in use by another host (through ARP).
donatien 0:8e01dca41002 824 *
donatien 0:8e01dca41002 825 * @param netif the netif under DHCP control
donatien 0:8e01dca41002 826 */
donatien 0:8e01dca41002 827 static err_t
donatien 0:8e01dca41002 828 dhcp_decline(struct netif *netif)
donatien 0:8e01dca41002 829 {
donatien 0:8e01dca41002 830 struct dhcp *dhcp = netif->dhcp;
donatien 0:8e01dca41002 831 err_t result = ERR_OK;
donatien 0:8e01dca41002 832 u16_t msecs;
donatien 0:8e01dca41002 833 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_decline()\n"));
donatien 0:8e01dca41002 834 dhcp_set_state(dhcp, DHCP_BACKING_OFF);
donatien 0:8e01dca41002 835 /* create and initialize the DHCP message header */
donatien 0:8e01dca41002 836 result = dhcp_create_msg(netif, dhcp, DHCP_DECLINE);
donatien 0:8e01dca41002 837 if (result == ERR_OK) {
donatien 0:8e01dca41002 838 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
donatien 0:8e01dca41002 839 dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
donatien 0:8e01dca41002 840
donatien 0:8e01dca41002 841 dhcp_option_trailer(dhcp);
donatien 0:8e01dca41002 842 /* resize pbuf to reflect true size of options */
donatien 0:8e01dca41002 843 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
donatien 0:8e01dca41002 844
donatien 0:8e01dca41002 845 /* per section 4.4.4, broadcast DECLINE messages */
donatien 0:8e01dca41002 846 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
donatien 0:8e01dca41002 847 dhcp_delete_msg(dhcp);
donatien 0:8e01dca41002 848 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_decline: BACKING OFF\n"));
donatien 0:8e01dca41002 849 } else {
donatien 0:8e01dca41002 850 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
donatien 0:8e01dca41002 851 ("dhcp_decline: could not allocate DHCP request\n"));
donatien 0:8e01dca41002 852 }
donatien 0:8e01dca41002 853 dhcp->tries++;
donatien 0:8e01dca41002 854 msecs = 10*1000;
donatien 0:8e01dca41002 855 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
donatien 0:8e01dca41002 856 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_decline(): set request timeout %"U16_F" msecs\n", msecs));
donatien 0:8e01dca41002 857 return result;
donatien 0:8e01dca41002 858 }
donatien 0:8e01dca41002 859 #endif /* DHCP_DOES_ARP_CHECK */
donatien 0:8e01dca41002 860
donatien 0:8e01dca41002 861
donatien 0:8e01dca41002 862 /**
donatien 0:8e01dca41002 863 * Start the DHCP process, discover a DHCP server.
donatien 0:8e01dca41002 864 *
donatien 0:8e01dca41002 865 * @param netif the netif under DHCP control
donatien 0:8e01dca41002 866 */
donatien 0:8e01dca41002 867 static err_t
donatien 0:8e01dca41002 868 dhcp_discover(struct netif *netif)
donatien 0:8e01dca41002 869 {
donatien 0:8e01dca41002 870 struct dhcp *dhcp = netif->dhcp;
donatien 0:8e01dca41002 871 err_t result = ERR_OK;
donatien 0:8e01dca41002 872 u16_t msecs;
donatien 0:8e01dca41002 873 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover()\n"));
donatien 0:8e01dca41002 874 ip_addr_set_any(&dhcp->offered_ip_addr);
donatien 0:8e01dca41002 875 dhcp_set_state(dhcp, DHCP_SELECTING);
donatien 0:8e01dca41002 876 /* create and initialize the DHCP message header */
donatien 0:8e01dca41002 877 result = dhcp_create_msg(netif, dhcp, DHCP_DISCOVER);
donatien 0:8e01dca41002 878 if (result == ERR_OK) {
donatien 0:8e01dca41002 879 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: making request\n"));
donatien 0:8e01dca41002 880
donatien 0:8e01dca41002 881 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
donatien 0:8e01dca41002 882 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
donatien 0:8e01dca41002 883
donatien 0:8e01dca41002 884 dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);
donatien 0:8e01dca41002 885 dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
donatien 0:8e01dca41002 886 dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
donatien 0:8e01dca41002 887 dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
donatien 0:8e01dca41002 888 dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
donatien 0:8e01dca41002 889
donatien 0:8e01dca41002 890 dhcp_option_trailer(dhcp);
donatien 0:8e01dca41002 891
donatien 0:8e01dca41002 892 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: realloc()ing\n"));
donatien 0:8e01dca41002 893 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
donatien 0:8e01dca41002 894
donatien 0:8e01dca41002 895 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: sendto(DISCOVER, IP_ADDR_BROADCAST, DHCP_SERVER_PORT)\n"));
donatien 0:8e01dca41002 896 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
donatien 0:8e01dca41002 897 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: deleting()ing\n"));
donatien 0:8e01dca41002 898 dhcp_delete_msg(dhcp);
donatien 0:8e01dca41002 899 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_discover: SELECTING\n"));
donatien 0:8e01dca41002 900 } else {
donatien 0:8e01dca41002 901 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_discover: could not allocate DHCP request\n"));
donatien 0:8e01dca41002 902 }
donatien 0:8e01dca41002 903 dhcp->tries++;
donatien 0:8e01dca41002 904 #if LWIP_DHCP_AUTOIP_COOP
donatien 0:8e01dca41002 905 if(dhcp->tries >= LWIP_DHCP_AUTOIP_COOP_TRIES && dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_OFF) {
donatien 0:8e01dca41002 906 dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_ON;
donatien 0:8e01dca41002 907 autoip_start(netif);
donatien 0:8e01dca41002 908 }
donatien 0:8e01dca41002 909 #endif /* LWIP_DHCP_AUTOIP_COOP */
donatien 0:8e01dca41002 910 msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
donatien 0:8e01dca41002 911 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
donatien 0:8e01dca41002 912 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_discover(): set request timeout %"U16_F" msecs\n", msecs));
donatien 0:8e01dca41002 913 return result;
donatien 0:8e01dca41002 914 }
donatien 0:8e01dca41002 915
donatien 0:8e01dca41002 916
donatien 0:8e01dca41002 917 /**
donatien 0:8e01dca41002 918 * Bind the interface to the offered IP address.
donatien 0:8e01dca41002 919 *
donatien 0:8e01dca41002 920 * @param netif network interface to bind to the offered address
donatien 0:8e01dca41002 921 */
donatien 0:8e01dca41002 922 static void
donatien 0:8e01dca41002 923 dhcp_bind(struct netif *netif)
donatien 0:8e01dca41002 924 {
donatien 0:8e01dca41002 925 u32_t timeout;
donatien 0:8e01dca41002 926 struct dhcp *dhcp;
donatien 0:8e01dca41002 927 ip_addr_t sn_mask, gw_addr;
donatien 0:8e01dca41002 928 LWIP_ERROR("dhcp_bind: netif != NULL", (netif != NULL), return;);
donatien 0:8e01dca41002 929 dhcp = netif->dhcp;
donatien 0:8e01dca41002 930 LWIP_ERROR("dhcp_bind: dhcp != NULL", (dhcp != NULL), return;);
donatien 0:8e01dca41002 931 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));
donatien 0:8e01dca41002 932
donatien 0:8e01dca41002 933 /* temporary DHCP lease? */
donatien 0:8e01dca41002 934 if (dhcp->offered_t1_renew != 0xffffffffUL) {
donatien 0:8e01dca41002 935 /* set renewal period timer */
donatien 0:8e01dca41002 936 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(): t1 renewal timer %"U32_F" secs\n", dhcp->offered_t1_renew));
donatien 0:8e01dca41002 937 timeout = (dhcp->offered_t1_renew + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
donatien 0:8e01dca41002 938 if(timeout > 0xffff) {
donatien 0:8e01dca41002 939 timeout = 0xffff;
donatien 0:8e01dca41002 940 }
donatien 0:8e01dca41002 941 dhcp->t1_timeout = (u16_t)timeout;
donatien 0:8e01dca41002 942 if (dhcp->t1_timeout == 0) {
donatien 0:8e01dca41002 943 dhcp->t1_timeout = 1;
donatien 0:8e01dca41002 944 }
donatien 0:8e01dca41002 945 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_bind(): set request timeout %"U32_F" msecs\n", dhcp->offered_t1_renew*1000));
donatien 0:8e01dca41002 946 }
donatien 0:8e01dca41002 947 /* set renewal period timer */
donatien 0:8e01dca41002 948 if (dhcp->offered_t2_rebind != 0xffffffffUL) {
donatien 0:8e01dca41002 949 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(): t2 rebind timer %"U32_F" secs\n", dhcp->offered_t2_rebind));
donatien 0:8e01dca41002 950 timeout = (dhcp->offered_t2_rebind + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
donatien 0:8e01dca41002 951 if(timeout > 0xffff) {
donatien 0:8e01dca41002 952 timeout = 0xffff;
donatien 0:8e01dca41002 953 }
donatien 0:8e01dca41002 954 dhcp->t2_timeout = (u16_t)timeout;
donatien 0:8e01dca41002 955 if (dhcp->t2_timeout == 0) {
donatien 0:8e01dca41002 956 dhcp->t2_timeout = 1;
donatien 0:8e01dca41002 957 }
donatien 0:8e01dca41002 958 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_bind(): set request timeout %"U32_F" msecs\n", dhcp->offered_t2_rebind*1000));
donatien 0:8e01dca41002 959 }
donatien 0:8e01dca41002 960
donatien 0:8e01dca41002 961 if (dhcp->subnet_mask_given) {
donatien 0:8e01dca41002 962 /* copy offered network mask */
donatien 0:8e01dca41002 963 ip_addr_copy(sn_mask, dhcp->offered_sn_mask);
donatien 0:8e01dca41002 964 } else {
donatien 0:8e01dca41002 965 /* subnet mask not given, choose a safe subnet mask given the network class */
donatien 0:8e01dca41002 966 u8_t first_octet = ip4_addr1(&dhcp->offered_ip_addr);
donatien 0:8e01dca41002 967 if (first_octet <= 127) {
donatien 0:8e01dca41002 968 ip4_addr_set_u32(&sn_mask, PP_HTONL(0xff000000UL));
donatien 0:8e01dca41002 969 } else if (first_octet >= 192) {
donatien 0:8e01dca41002 970 ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffffff00UL));
donatien 0:8e01dca41002 971 } else {
donatien 0:8e01dca41002 972 ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffff0000UL));
donatien 0:8e01dca41002 973 }
donatien 0:8e01dca41002 974 }
donatien 0:8e01dca41002 975
donatien 0:8e01dca41002 976 ip_addr_copy(gw_addr, dhcp->offered_gw_addr);
donatien 0:8e01dca41002 977 /* gateway address not given? */
donatien 0:8e01dca41002 978 if (ip_addr_isany(&gw_addr)) {
donatien 0:8e01dca41002 979 /* copy network address */
donatien 0:8e01dca41002 980 ip_addr_get_network(&gw_addr, &dhcp->offered_ip_addr, &sn_mask);
donatien 0:8e01dca41002 981 /* use first host address on network as gateway */
donatien 0:8e01dca41002 982 ip4_addr_set_u32(&gw_addr, ip4_addr_get_u32(&gw_addr) | PP_HTONL(0x00000001UL));
donatien 0:8e01dca41002 983 }
donatien 0:8e01dca41002 984
donatien 0:8e01dca41002 985 #if LWIP_DHCP_AUTOIP_COOP
donatien 0:8e01dca41002 986 if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
donatien 0:8e01dca41002 987 autoip_stop(netif);
donatien 0:8e01dca41002 988 dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
donatien 0:8e01dca41002 989 }
donatien 0:8e01dca41002 990 #endif /* LWIP_DHCP_AUTOIP_COOP */
donatien 0:8e01dca41002 991
donatien 0:8e01dca41002 992 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): IP: %d.%d.%d.%d\n",
donatien 0:8e01dca41002 993 ip4_addr1(&dhcp->offered_ip_addr), ip4_addr2(&dhcp->offered_ip_addr), ip4_addr3(&dhcp->offered_ip_addr), ip4_addr4(&dhcp->offered_ip_addr)));
donatien 0:8e01dca41002 994 netif_set_ipaddr(netif, &dhcp->offered_ip_addr);
donatien 0:8e01dca41002 995 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): SN: 0x%08"X32_F"\n",
donatien 0:8e01dca41002 996 ip4_addr_get_u32(&sn_mask)));
donatien 0:8e01dca41002 997 netif_set_netmask(netif, &sn_mask);
donatien 0:8e01dca41002 998 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): GW: 0x%08"X32_F"\n",
donatien 0:8e01dca41002 999 ip4_addr_get_u32(&gw_addr)));
donatien 0:8e01dca41002 1000 netif_set_gw(netif, &gw_addr);
donatien 0:8e01dca41002 1001 /* bring the interface up */
donatien 0:8e01dca41002 1002 netif_set_up(netif);
donatien 0:8e01dca41002 1003 /* netif is now bound to DHCP leased address */
donatien 0:8e01dca41002 1004 dhcp_set_state(dhcp, DHCP_BOUND);
donatien 0:8e01dca41002 1005 }
donatien 0:8e01dca41002 1006
donatien 0:8e01dca41002 1007 /**
donatien 0:8e01dca41002 1008 * Renew an existing DHCP lease at the involved DHCP server.
donatien 0:8e01dca41002 1009 *
donatien 0:8e01dca41002 1010 * @param netif network interface which must renew its lease
donatien 0:8e01dca41002 1011 */
donatien 0:8e01dca41002 1012 err_t
donatien 0:8e01dca41002 1013 dhcp_renew(struct netif *netif)
donatien 0:8e01dca41002 1014 {
donatien 0:8e01dca41002 1015 struct dhcp *dhcp = netif->dhcp;
donatien 0:8e01dca41002 1016 err_t result;
donatien 0:8e01dca41002 1017 u16_t msecs;
donatien 0:8e01dca41002 1018 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_renew()\n"));
donatien 0:8e01dca41002 1019 dhcp_set_state(dhcp, DHCP_RENEWING);
donatien 0:8e01dca41002 1020
donatien 0:8e01dca41002 1021 /* create and initialize the DHCP message header */
donatien 0:8e01dca41002 1022 result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
donatien 0:8e01dca41002 1023 if (result == ERR_OK) {
donatien 0:8e01dca41002 1024 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
donatien 0:8e01dca41002 1025 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
donatien 0:8e01dca41002 1026
donatien 0:8e01dca41002 1027 #if LWIP_NETIF_HOSTNAME
donatien 0:8e01dca41002 1028 if (netif->hostname != NULL) {
donatien 0:8e01dca41002 1029 const char *p = (const char*)netif->hostname;
donatien 0:8e01dca41002 1030 u8_t namelen = (u8_t)strlen(p);
donatien 0:8e01dca41002 1031 if (namelen > 0) {
donatien 0:8e01dca41002 1032 LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
donatien 0:8e01dca41002 1033 dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
donatien 0:8e01dca41002 1034 while (*p) {
donatien 0:8e01dca41002 1035 dhcp_option_byte(dhcp, *p++);
donatien 0:8e01dca41002 1036 }
donatien 0:8e01dca41002 1037 }
donatien 0:8e01dca41002 1038 }
donatien 0:8e01dca41002 1039 #endif /* LWIP_NETIF_HOSTNAME */
donatien 0:8e01dca41002 1040
donatien 0:8e01dca41002 1041 #if 0
donatien 0:8e01dca41002 1042 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
donatien 0:8e01dca41002 1043 dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
donatien 0:8e01dca41002 1044 #endif
donatien 0:8e01dca41002 1045
donatien 0:8e01dca41002 1046 #if 0
donatien 0:8e01dca41002 1047 dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
donatien 0:8e01dca41002 1048 dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
donatien 0:8e01dca41002 1049 #endif
donatien 0:8e01dca41002 1050 /* append DHCP message trailer */
donatien 0:8e01dca41002 1051 dhcp_option_trailer(dhcp);
donatien 0:8e01dca41002 1052
donatien 0:8e01dca41002 1053 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
donatien 0:8e01dca41002 1054
donatien 0:8e01dca41002 1055 udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
donatien 0:8e01dca41002 1056 dhcp_delete_msg(dhcp);
donatien 0:8e01dca41002 1057
donatien 0:8e01dca41002 1058 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_renew: RENEWING\n"));
donatien 0:8e01dca41002 1059 } else {
donatien 0:8e01dca41002 1060 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_renew: could not allocate DHCP request\n"));
donatien 0:8e01dca41002 1061 }
donatien 0:8e01dca41002 1062 dhcp->tries++;
donatien 0:8e01dca41002 1063 /* back-off on retries, but to a maximum of 20 seconds */
donatien 0:8e01dca41002 1064 msecs = dhcp->tries < 10 ? dhcp->tries * 2000 : 20 * 1000;
donatien 0:8e01dca41002 1065 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
donatien 0:8e01dca41002 1066 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_renew(): set request timeout %"U16_F" msecs\n", msecs));
donatien 0:8e01dca41002 1067 return result;
donatien 0:8e01dca41002 1068 }
donatien 0:8e01dca41002 1069
donatien 0:8e01dca41002 1070 /**
donatien 0:8e01dca41002 1071 * Rebind with a DHCP server for an existing DHCP lease.
donatien 0:8e01dca41002 1072 *
donatien 0:8e01dca41002 1073 * @param netif network interface which must rebind with a DHCP server
donatien 0:8e01dca41002 1074 */
donatien 0:8e01dca41002 1075 static err_t
donatien 0:8e01dca41002 1076 dhcp_rebind(struct netif *netif)
donatien 0:8e01dca41002 1077 {
donatien 0:8e01dca41002 1078 struct dhcp *dhcp = netif->dhcp;
donatien 0:8e01dca41002 1079 err_t result;
donatien 0:8e01dca41002 1080 u16_t msecs;
donatien 0:8e01dca41002 1081 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind()\n"));
donatien 0:8e01dca41002 1082 dhcp_set_state(dhcp, DHCP_REBINDING);
donatien 0:8e01dca41002 1083
donatien 0:8e01dca41002 1084 /* create and initialize the DHCP message header */
donatien 0:8e01dca41002 1085 result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
donatien 0:8e01dca41002 1086 if (result == ERR_OK) {
donatien 0:8e01dca41002 1087 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
donatien 0:8e01dca41002 1088 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
donatien 0:8e01dca41002 1089
donatien 0:8e01dca41002 1090 #if LWIP_NETIF_HOSTNAME
donatien 0:8e01dca41002 1091 if (netif->hostname != NULL) {
donatien 0:8e01dca41002 1092 const char *p = (const char*)netif->hostname;
donatien 0:8e01dca41002 1093 u8_t namelen = (u8_t)strlen(p);
donatien 0:8e01dca41002 1094 if (namelen > 0) {
donatien 0:8e01dca41002 1095 LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
donatien 0:8e01dca41002 1096 dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
donatien 0:8e01dca41002 1097 while (*p) {
donatien 0:8e01dca41002 1098 dhcp_option_byte(dhcp, *p++);
donatien 0:8e01dca41002 1099 }
donatien 0:8e01dca41002 1100 }
donatien 0:8e01dca41002 1101 }
donatien 0:8e01dca41002 1102 #endif /* LWIP_NETIF_HOSTNAME */
donatien 0:8e01dca41002 1103
donatien 0:8e01dca41002 1104 #if 0
donatien 0:8e01dca41002 1105 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
donatien 0:8e01dca41002 1106 dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
donatien 0:8e01dca41002 1107
donatien 0:8e01dca41002 1108 dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
donatien 0:8e01dca41002 1109 dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
donatien 0:8e01dca41002 1110 #endif
donatien 0:8e01dca41002 1111
donatien 0:8e01dca41002 1112 dhcp_option_trailer(dhcp);
donatien 0:8e01dca41002 1113
donatien 0:8e01dca41002 1114 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
donatien 0:8e01dca41002 1115
donatien 0:8e01dca41002 1116 /* broadcast to server */
donatien 0:8e01dca41002 1117 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
donatien 0:8e01dca41002 1118 dhcp_delete_msg(dhcp);
donatien 0:8e01dca41002 1119 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind: REBINDING\n"));
donatien 0:8e01dca41002 1120 } else {
donatien 0:8e01dca41002 1121 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_rebind: could not allocate DHCP request\n"));
donatien 0:8e01dca41002 1122 }
donatien 0:8e01dca41002 1123 dhcp->tries++;
donatien 0:8e01dca41002 1124 msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
donatien 0:8e01dca41002 1125 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
donatien 0:8e01dca41002 1126 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind(): set request timeout %"U16_F" msecs\n", msecs));
donatien 0:8e01dca41002 1127 return result;
donatien 0:8e01dca41002 1128 }
donatien 0:8e01dca41002 1129
donatien 0:8e01dca41002 1130 /**
donatien 0:8e01dca41002 1131 * Enter REBOOTING state to verify an existing lease
donatien 0:8e01dca41002 1132 *
donatien 0:8e01dca41002 1133 * @param netif network interface which must reboot
donatien 0:8e01dca41002 1134 */
donatien 0:8e01dca41002 1135 static err_t
donatien 0:8e01dca41002 1136 dhcp_reboot(struct netif *netif)
donatien 0:8e01dca41002 1137 {
donatien 0:8e01dca41002 1138 struct dhcp *dhcp = netif->dhcp;
donatien 0:8e01dca41002 1139 err_t result;
donatien 0:8e01dca41002 1140 u16_t msecs;
donatien 0:8e01dca41002 1141 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot()\n"));
donatien 0:8e01dca41002 1142 dhcp_set_state(dhcp, DHCP_REBOOTING);
donatien 0:8e01dca41002 1143
donatien 0:8e01dca41002 1144 /* create and initialize the DHCP message header */
donatien 0:8e01dca41002 1145 result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
donatien 0:8e01dca41002 1146 if (result == ERR_OK) {
donatien 0:8e01dca41002 1147 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
donatien 0:8e01dca41002 1148 dhcp_option_short(dhcp, 576);
donatien 0:8e01dca41002 1149
donatien 0:8e01dca41002 1150 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
donatien 0:8e01dca41002 1151 dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
donatien 0:8e01dca41002 1152
donatien 0:8e01dca41002 1153 dhcp_option_trailer(dhcp);
donatien 0:8e01dca41002 1154
donatien 0:8e01dca41002 1155 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
donatien 0:8e01dca41002 1156
donatien 0:8e01dca41002 1157 /* broadcast to server */
donatien 0:8e01dca41002 1158 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
donatien 0:8e01dca41002 1159 dhcp_delete_msg(dhcp);
donatien 0:8e01dca41002 1160 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot: REBOOTING\n"));
donatien 0:8e01dca41002 1161 } else {
donatien 0:8e01dca41002 1162 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_reboot: could not allocate DHCP request\n"));
donatien 0:8e01dca41002 1163 }
donatien 0:8e01dca41002 1164 dhcp->tries++;
donatien 0:8e01dca41002 1165 msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
donatien 0:8e01dca41002 1166 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
donatien 0:8e01dca41002 1167 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot(): set request timeout %"U16_F" msecs\n", msecs));
donatien 0:8e01dca41002 1168 return result;
donatien 0:8e01dca41002 1169 }
donatien 0:8e01dca41002 1170
donatien 0:8e01dca41002 1171
donatien 0:8e01dca41002 1172 /**
donatien 0:8e01dca41002 1173 * Release a DHCP lease.
donatien 0:8e01dca41002 1174 *
donatien 0:8e01dca41002 1175 * @param netif network interface which must release its lease
donatien 0:8e01dca41002 1176 */
donatien 0:8e01dca41002 1177 err_t
donatien 0:8e01dca41002 1178 dhcp_release(struct netif *netif)
donatien 0:8e01dca41002 1179 {
donatien 0:8e01dca41002 1180 struct dhcp *dhcp = netif->dhcp;
donatien 0:8e01dca41002 1181 err_t result;
donatien 0:8e01dca41002 1182 u16_t msecs;
donatien 0:8e01dca41002 1183 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_release()\n"));
donatien 0:8e01dca41002 1184
donatien 0:8e01dca41002 1185 /* idle DHCP client */
donatien 0:8e01dca41002 1186 dhcp_set_state(dhcp, DHCP_OFF);
donatien 0:8e01dca41002 1187 /* clean old DHCP offer */
donatien 0:8e01dca41002 1188 ip_addr_set_zero(&dhcp->server_ip_addr);
donatien 0:8e01dca41002 1189 ip_addr_set_zero(&dhcp->offered_ip_addr);
donatien 0:8e01dca41002 1190 ip_addr_set_zero(&dhcp->offered_sn_mask);
donatien 0:8e01dca41002 1191 ip_addr_set_zero(&dhcp->offered_gw_addr);
donatien 0:8e01dca41002 1192 #if LWIP_DHCP_BOOTP_FILE
donatien 0:8e01dca41002 1193 ip_addr_set_zero(&dhcp->offered_si_addr);
donatien 0:8e01dca41002 1194 #endif /* LWIP_DHCP_BOOTP_FILE */
donatien 0:8e01dca41002 1195 dhcp->offered_t0_lease = dhcp->offered_t1_renew = dhcp->offered_t2_rebind = 0;
donatien 0:8e01dca41002 1196
donatien 0:8e01dca41002 1197 /* create and initialize the DHCP message header */
donatien 0:8e01dca41002 1198 result = dhcp_create_msg(netif, dhcp, DHCP_RELEASE);
donatien 0:8e01dca41002 1199 if (result == ERR_OK) {
donatien 0:8e01dca41002 1200 dhcp_option_trailer(dhcp);
donatien 0:8e01dca41002 1201
donatien 0:8e01dca41002 1202 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
donatien 0:8e01dca41002 1203
donatien 0:8e01dca41002 1204 udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
donatien 0:8e01dca41002 1205 dhcp_delete_msg(dhcp);
donatien 0:8e01dca41002 1206 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_release: RELEASED, DHCP_OFF\n"));
donatien 0:8e01dca41002 1207 } else {
donatien 0:8e01dca41002 1208 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_release: could not allocate DHCP request\n"));
donatien 0:8e01dca41002 1209 }
donatien 0:8e01dca41002 1210 dhcp->tries++;
donatien 0:8e01dca41002 1211 msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
donatien 0:8e01dca41002 1212 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
donatien 0:8e01dca41002 1213 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_release(): set request timeout %"U16_F" msecs\n", msecs));
donatien 0:8e01dca41002 1214 /* bring the interface down */
donatien 0:8e01dca41002 1215 netif_set_down(netif);
donatien 0:8e01dca41002 1216 /* remove IP address from interface */
donatien 0:8e01dca41002 1217 netif_set_ipaddr(netif, IP_ADDR_ANY);
donatien 0:8e01dca41002 1218 netif_set_gw(netif, IP_ADDR_ANY);
donatien 0:8e01dca41002 1219 netif_set_netmask(netif, IP_ADDR_ANY);
donatien 0:8e01dca41002 1220
donatien 0:8e01dca41002 1221 return result;
donatien 0:8e01dca41002 1222 }
donatien 0:8e01dca41002 1223
donatien 0:8e01dca41002 1224 /**
donatien 0:8e01dca41002 1225 * Remove the DHCP client from the interface.
donatien 0:8e01dca41002 1226 *
donatien 0:8e01dca41002 1227 * @param netif The network interface to stop DHCP on
donatien 0:8e01dca41002 1228 */
donatien 0:8e01dca41002 1229 void
donatien 0:8e01dca41002 1230 dhcp_stop(struct netif *netif)
donatien 0:8e01dca41002 1231 {
donatien 0:8e01dca41002 1232 struct dhcp *dhcp;
donatien 0:8e01dca41002 1233 LWIP_ERROR("dhcp_stop: netif != NULL", (netif != NULL), return;);
donatien 0:8e01dca41002 1234 dhcp = netif->dhcp;
donatien 0:8e01dca41002 1235 /* Remove the flag that says this netif is handled by DHCP. */
donatien 0:8e01dca41002 1236 netif->flags &= ~NETIF_FLAG_DHCP;
donatien 0:8e01dca41002 1237
donatien 0:8e01dca41002 1238 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_stop()\n"));
donatien 0:8e01dca41002 1239 /* netif is DHCP configured? */
donatien 0:8e01dca41002 1240 if (dhcp != NULL) {
donatien 0:8e01dca41002 1241 #if LWIP_DHCP_AUTOIP_COOP
donatien 0:8e01dca41002 1242 if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
donatien 0:8e01dca41002 1243 autoip_stop(netif);
donatien 0:8e01dca41002 1244 dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
donatien 0:8e01dca41002 1245 }
donatien 0:8e01dca41002 1246 #endif /* LWIP_DHCP_AUTOIP_COOP */
donatien 0:8e01dca41002 1247
donatien 0:8e01dca41002 1248 if (dhcp->pcb != NULL) {
donatien 0:8e01dca41002 1249 udp_remove(dhcp->pcb);
donatien 0:8e01dca41002 1250 dhcp->pcb = NULL;
donatien 0:8e01dca41002 1251 }
donatien 0:8e01dca41002 1252 LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
donatien 0:8e01dca41002 1253 dhcp_set_state(dhcp, DHCP_OFF);
donatien 0:8e01dca41002 1254 }
donatien 0:8e01dca41002 1255 }
donatien 0:8e01dca41002 1256
donatien 0:8e01dca41002 1257 /*
donatien 0:8e01dca41002 1258 * Set the DHCP state of a DHCP client.
donatien 0:8e01dca41002 1259 *
donatien 0:8e01dca41002 1260 * If the state changed, reset the number of tries.
donatien 0:8e01dca41002 1261 */
donatien 0:8e01dca41002 1262 static void
donatien 0:8e01dca41002 1263 dhcp_set_state(struct dhcp *dhcp, u8_t new_state)
donatien 0:8e01dca41002 1264 {
donatien 0:8e01dca41002 1265 if (new_state != dhcp->state) {
donatien 0:8e01dca41002 1266 dhcp->state = new_state;
donatien 0:8e01dca41002 1267 dhcp->tries = 0;
donatien 0:8e01dca41002 1268 dhcp->request_timeout = 0;
donatien 0:8e01dca41002 1269 }
donatien 0:8e01dca41002 1270 }
donatien 0:8e01dca41002 1271
donatien 0:8e01dca41002 1272 /*
donatien 0:8e01dca41002 1273 * Concatenate an option type and length field to the outgoing
donatien 0:8e01dca41002 1274 * DHCP message.
donatien 0:8e01dca41002 1275 *
donatien 0:8e01dca41002 1276 */
donatien 0:8e01dca41002 1277 static void
donatien 0:8e01dca41002 1278 dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len)
donatien 0:8e01dca41002 1279 {
donatien 0:8e01dca41002 1280 LWIP_ASSERT("dhcp_option: dhcp->options_out_len + 2 + option_len <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U + option_len <= DHCP_OPTIONS_LEN);
donatien 0:8e01dca41002 1281 dhcp->msg_out->options[dhcp->options_out_len++] = option_type;
donatien 0:8e01dca41002 1282 dhcp->msg_out->options[dhcp->options_out_len++] = option_len;
donatien 0:8e01dca41002 1283 }
donatien 0:8e01dca41002 1284 /*
donatien 0:8e01dca41002 1285 * Concatenate a single byte to the outgoing DHCP message.
donatien 0:8e01dca41002 1286 *
donatien 0:8e01dca41002 1287 */
donatien 0:8e01dca41002 1288 static void
donatien 0:8e01dca41002 1289 dhcp_option_byte(struct dhcp *dhcp, u8_t value)
donatien 0:8e01dca41002 1290 {
donatien 0:8e01dca41002 1291 LWIP_ASSERT("dhcp_option_byte: dhcp->options_out_len < DHCP_OPTIONS_LEN", dhcp->options_out_len < DHCP_OPTIONS_LEN);
donatien 0:8e01dca41002 1292 dhcp->msg_out->options[dhcp->options_out_len++] = value;
donatien 0:8e01dca41002 1293 }
donatien 0:8e01dca41002 1294
donatien 0:8e01dca41002 1295 static void
donatien 0:8e01dca41002 1296 dhcp_option_short(struct dhcp *dhcp, u16_t value)
donatien 0:8e01dca41002 1297 {
donatien 0:8e01dca41002 1298 LWIP_ASSERT("dhcp_option_short: dhcp->options_out_len + 2 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U <= DHCP_OPTIONS_LEN);
donatien 0:8e01dca41002 1299 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff00U) >> 8);
donatien 0:8e01dca41002 1300 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t) (value & 0x00ffU);
donatien 0:8e01dca41002 1301 }
donatien 0:8e01dca41002 1302
donatien 0:8e01dca41002 1303 static void
donatien 0:8e01dca41002 1304 dhcp_option_long(struct dhcp *dhcp, u32_t value)
donatien 0:8e01dca41002 1305 {
donatien 0:8e01dca41002 1306 LWIP_ASSERT("dhcp_option_long: dhcp->options_out_len + 4 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 4U <= DHCP_OPTIONS_LEN);
donatien 0:8e01dca41002 1307 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff000000UL) >> 24);
donatien 0:8e01dca41002 1308 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x00ff0000UL) >> 16);
donatien 0:8e01dca41002 1309 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x0000ff00UL) >> 8);
donatien 0:8e01dca41002 1310 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x000000ffUL));
donatien 0:8e01dca41002 1311 }
donatien 0:8e01dca41002 1312
donatien 0:8e01dca41002 1313 /**
donatien 0:8e01dca41002 1314 * Extract the DHCP message and the DHCP options.
donatien 0:8e01dca41002 1315 *
donatien 0:8e01dca41002 1316 * Extract the DHCP message and the DHCP options, each into a contiguous
donatien 0:8e01dca41002 1317 * piece of memory. As a DHCP message is variable sized by its options,
donatien 0:8e01dca41002 1318 * and also allows overriding some fields for options, the easy approach
donatien 0:8e01dca41002 1319 * is to first unfold the options into a conitguous piece of memory, and
donatien 0:8e01dca41002 1320 * use that further on.
donatien 0:8e01dca41002 1321 *
donatien 0:8e01dca41002 1322 */
donatien 0:8e01dca41002 1323 static err_t
donatien 0:8e01dca41002 1324 dhcp_parse_reply(struct dhcp *dhcp, struct pbuf *p)
donatien 0:8e01dca41002 1325 {
donatien 0:8e01dca41002 1326 u8_t *options;
donatien 0:8e01dca41002 1327 u16_t offset;
donatien 0:8e01dca41002 1328 u16_t offset_max;
donatien 0:8e01dca41002 1329 u16_t options_idx;
donatien 0:8e01dca41002 1330 u16_t options_idx_max;
donatien 0:8e01dca41002 1331 struct pbuf *q;
donatien 0:8e01dca41002 1332 int parse_file_as_options = 0;
donatien 0:8e01dca41002 1333 int parse_sname_as_options = 0;
donatien 0:8e01dca41002 1334
donatien 0:8e01dca41002 1335 /* clear received options */
donatien 0:8e01dca41002 1336 dhcp_clear_all_options(dhcp);
donatien 0:8e01dca41002 1337 /* check that beginning of dhcp_msg (up to and including chaddr) is in first pbuf */
donatien 0:8e01dca41002 1338 if (p->len < DHCP_SNAME_OFS) {
donatien 0:8e01dca41002 1339 return ERR_BUF;
donatien 0:8e01dca41002 1340 }
donatien 0:8e01dca41002 1341 dhcp->msg_in = (struct dhcp_msg *)p->payload;
donatien 0:8e01dca41002 1342 #if LWIP_DHCP_BOOTP_FILE
donatien 0:8e01dca41002 1343 /* clear boot file name */
donatien 0:8e01dca41002 1344 dhcp->boot_file_name[0] = 0;
donatien 0:8e01dca41002 1345 #endif /* LWIP_DHCP_BOOTP_FILE */
donatien 0:8e01dca41002 1346
donatien 0:8e01dca41002 1347 /* parse options */
donatien 0:8e01dca41002 1348
donatien 0:8e01dca41002 1349 /* start with options field */
donatien 0:8e01dca41002 1350 options_idx = DHCP_OPTIONS_OFS;
donatien 0:8e01dca41002 1351 /* parse options to the end of the received packet */
donatien 0:8e01dca41002 1352 options_idx_max = p->tot_len;
donatien 0:8e01dca41002 1353 again:
donatien 0:8e01dca41002 1354 q = p;
donatien 0:8e01dca41002 1355 while((q != NULL) && (options_idx >= q->len)) {
donatien 0:8e01dca41002 1356 options_idx -= q->len;
donatien 0:8e01dca41002 1357 options_idx_max -= q->len;
donatien 0:8e01dca41002 1358 q = q->next;
donatien 0:8e01dca41002 1359 }
donatien 0:8e01dca41002 1360 if (q == NULL) {
donatien 0:8e01dca41002 1361 return ERR_BUF;
donatien 0:8e01dca41002 1362 }
donatien 0:8e01dca41002 1363 offset = options_idx;
donatien 0:8e01dca41002 1364 offset_max = options_idx_max;
donatien 0:8e01dca41002 1365 options = (u8_t*)q->payload;
donatien 0:8e01dca41002 1366 /* at least 1 byte to read and no end marker, then at least 3 bytes to read? */
donatien 0:8e01dca41002 1367 while((q != NULL) && (options[offset] != DHCP_OPTION_END) && (offset < offset_max)) {
donatien 0:8e01dca41002 1368 u8_t op = options[offset];
donatien 0:8e01dca41002 1369 u8_t len;
donatien 0:8e01dca41002 1370 u8_t decode_len = 0;
donatien 0:8e01dca41002 1371 int decode_idx = -1;
donatien 0:8e01dca41002 1372 u16_t val_offset = offset + 2;
donatien 0:8e01dca41002 1373 /* len byte might be in the next pbuf */
donatien 0:8e01dca41002 1374 if (offset + 1 < q->len) {
donatien 0:8e01dca41002 1375 len = options[offset + 1];
donatien 0:8e01dca41002 1376 } else {
donatien 0:8e01dca41002 1377 len = (q->next != NULL ? ((u8_t*)q->next->payload)[0] : 0);
donatien 0:8e01dca41002 1378 }
donatien 0:8e01dca41002 1379 /* LWIP_DEBUGF(DHCP_DEBUG, ("msg_offset=%"U16_F", q->len=%"U16_F, msg_offset, q->len)); */
donatien 0:8e01dca41002 1380 decode_len = len;
donatien 0:8e01dca41002 1381 switch(op) {
donatien 0:8e01dca41002 1382 /* case(DHCP_OPTION_END): handled above */
donatien 0:8e01dca41002 1383 case(DHCP_OPTION_PAD):
donatien 0:8e01dca41002 1384 /* special option: no len encoded */
donatien 0:8e01dca41002 1385 decode_len = len = 0;
donatien 0:8e01dca41002 1386 /* will be increased below */
donatien 0:8e01dca41002 1387 offset--;
donatien 0:8e01dca41002 1388 break;
donatien 0:8e01dca41002 1389 case(DHCP_OPTION_SUBNET_MASK):
donatien 0:8e01dca41002 1390 LWIP_ASSERT("len == 4", len == 4);
donatien 0:8e01dca41002 1391 decode_idx = DHCP_OPTION_IDX_SUBNET_MASK;
donatien 0:8e01dca41002 1392 break;
donatien 0:8e01dca41002 1393 case(DHCP_OPTION_ROUTER):
donatien 0:8e01dca41002 1394 decode_len = 4; /* only copy the first given router */
donatien 0:8e01dca41002 1395 LWIP_ASSERT("len >= decode_len", len >= decode_len);
donatien 0:8e01dca41002 1396 decode_idx = DHCP_OPTION_IDX_ROUTER;
donatien 0:8e01dca41002 1397 break;
donatien 0:8e01dca41002 1398 case(DHCP_OPTION_DNS_SERVER):
donatien 0:8e01dca41002 1399 /* special case: there might be more than one server */
donatien 0:8e01dca41002 1400 LWIP_ASSERT("len % 4 == 0", len % 4 == 0);
donatien 0:8e01dca41002 1401 /* limit number of DNS servers */
donatien 0:8e01dca41002 1402 decode_len = LWIP_MIN(len, 4 * DNS_MAX_SERVERS);
donatien 0:8e01dca41002 1403 LWIP_ASSERT("len >= decode_len", len >= decode_len);
donatien 0:8e01dca41002 1404 decode_idx = DHCP_OPTION_IDX_DNS_SERVER;
donatien 0:8e01dca41002 1405 break;
donatien 0:8e01dca41002 1406 case(DHCP_OPTION_LEASE_TIME):
donatien 0:8e01dca41002 1407 LWIP_ASSERT("len == 4", len == 4);
donatien 0:8e01dca41002 1408 decode_idx = DHCP_OPTION_IDX_LEASE_TIME;
donatien 0:8e01dca41002 1409 break;
donatien 0:8e01dca41002 1410 case(DHCP_OPTION_OVERLOAD):
donatien 0:8e01dca41002 1411 LWIP_ASSERT("len == 1", len == 1);
donatien 0:8e01dca41002 1412 decode_idx = DHCP_OPTION_IDX_OVERLOAD;
donatien 0:8e01dca41002 1413 break;
donatien 0:8e01dca41002 1414 case(DHCP_OPTION_MESSAGE_TYPE):
donatien 0:8e01dca41002 1415 LWIP_ASSERT("len == 1", len == 1);
donatien 0:8e01dca41002 1416 decode_idx = DHCP_OPTION_IDX_MSG_TYPE;
donatien 0:8e01dca41002 1417 break;
donatien 0:8e01dca41002 1418 case(DHCP_OPTION_SERVER_ID):
donatien 0:8e01dca41002 1419 LWIP_ASSERT("len == 4", len == 4);
donatien 0:8e01dca41002 1420 decode_idx = DHCP_OPTION_IDX_SERVER_ID;
donatien 0:8e01dca41002 1421 break;
donatien 0:8e01dca41002 1422 case(DHCP_OPTION_T1):
donatien 0:8e01dca41002 1423 LWIP_ASSERT("len == 4", len == 4);
donatien 0:8e01dca41002 1424 decode_idx = DHCP_OPTION_IDX_T1;
donatien 0:8e01dca41002 1425 break;
donatien 0:8e01dca41002 1426 case(DHCP_OPTION_T2):
donatien 0:8e01dca41002 1427 LWIP_ASSERT("len == 4", len == 4);
donatien 0:8e01dca41002 1428 decode_idx = DHCP_OPTION_IDX_T2;
donatien 0:8e01dca41002 1429 break;
donatien 0:8e01dca41002 1430 default:
donatien 0:8e01dca41002 1431 decode_len = 0;
donatien 0:8e01dca41002 1432 LWIP_DEBUGF(DHCP_DEBUG, ("skipping option %"U16_F" in options\n", op));
donatien 0:8e01dca41002 1433 break;
donatien 0:8e01dca41002 1434 }
donatien 0:8e01dca41002 1435 offset += len + 2;
donatien 0:8e01dca41002 1436 if (decode_len > 0) {
donatien 0:8e01dca41002 1437 u32_t value = 0;
donatien 0:8e01dca41002 1438 u16_t copy_len;
donatien 0:8e01dca41002 1439 decode_next:
donatien 0:8e01dca41002 1440 LWIP_ASSERT("check decode_idx", decode_idx >= 0 && decode_idx < DHCP_OPTION_IDX_MAX);
donatien 0:8e01dca41002 1441 LWIP_ASSERT("option already decoded", !dhcp_option_given(dhcp, decode_idx));
donatien 0:8e01dca41002 1442 copy_len = LWIP_MIN(decode_len, 4);
donatien 0:8e01dca41002 1443 pbuf_copy_partial(q, &value, copy_len, val_offset);
donatien 0:8e01dca41002 1444 if (decode_len > 4) {
donatien 0:8e01dca41002 1445 /* decode more than one u32_t */
donatien 0:8e01dca41002 1446 LWIP_ASSERT("decode_len % 4 == 0", decode_len % 4 == 0);
donatien 0:8e01dca41002 1447 dhcp_got_option(dhcp, decode_idx);
donatien 0:8e01dca41002 1448 dhcp_set_option_value(dhcp, decode_idx, htonl(value));
donatien 0:8e01dca41002 1449 decode_len -= 4;
donatien 0:8e01dca41002 1450 val_offset += 4;
donatien 0:8e01dca41002 1451 decode_idx++;
donatien 0:8e01dca41002 1452 goto decode_next;
donatien 0:8e01dca41002 1453 } else if (decode_len == 4) {
donatien 0:8e01dca41002 1454 value = ntohl(value);
donatien 0:8e01dca41002 1455 } else {
donatien 0:8e01dca41002 1456 LWIP_ASSERT("invalid decode_len", decode_len == 1);
donatien 0:8e01dca41002 1457 value = ((u8_t*)&value)[0];
donatien 0:8e01dca41002 1458 }
donatien 0:8e01dca41002 1459 dhcp_got_option(dhcp, decode_idx);
donatien 0:8e01dca41002 1460 dhcp_set_option_value(dhcp, decode_idx, value);
donatien 0:8e01dca41002 1461 }
donatien 0:8e01dca41002 1462 if (offset >= q->len) {
donatien 0:8e01dca41002 1463 offset -= q->len;
donatien 0:8e01dca41002 1464 offset_max -= q->len;
donatien 0:8e01dca41002 1465 q = q->next;
donatien 0:8e01dca41002 1466 options = (u8_t*)q->payload;
donatien 0:8e01dca41002 1467 }
donatien 0:8e01dca41002 1468 }
donatien 0:8e01dca41002 1469 /* is this an overloaded message? */
donatien 0:8e01dca41002 1470 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_OVERLOAD)) {
donatien 0:8e01dca41002 1471 u32_t overload = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_OVERLOAD);
donatien 0:8e01dca41002 1472 dhcp_clear_option(dhcp, DHCP_OPTION_IDX_OVERLOAD);
donatien 0:8e01dca41002 1473 if (overload == DHCP_OVERLOAD_FILE) {
donatien 0:8e01dca41002 1474 parse_file_as_options = 1;
donatien 0:8e01dca41002 1475 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded file field\n"));
donatien 0:8e01dca41002 1476 } else if (overload == DHCP_OVERLOAD_SNAME) {
donatien 0:8e01dca41002 1477 parse_sname_as_options = 1;
donatien 0:8e01dca41002 1478 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded sname field\n"));
donatien 0:8e01dca41002 1479 } else if (overload == DHCP_OVERLOAD_SNAME_FILE) {
donatien 0:8e01dca41002 1480 parse_sname_as_options = 1;
donatien 0:8e01dca41002 1481 parse_file_as_options = 1;
donatien 0:8e01dca41002 1482 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded sname and file field\n"));
donatien 0:8e01dca41002 1483 } else {
donatien 0:8e01dca41002 1484 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("invalid overload option: %d\n", (int)overload));
donatien 0:8e01dca41002 1485 }
donatien 0:8e01dca41002 1486 #if LWIP_DHCP_BOOTP_FILE
donatien 0:8e01dca41002 1487 if (!parse_file_as_options) {
donatien 0:8e01dca41002 1488 /* only do this for ACK messages */
donatien 0:8e01dca41002 1489 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE) &&
donatien 0:8e01dca41002 1490 (dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE) == DHCP_ACK))
donatien 0:8e01dca41002 1491 /* copy bootp file name, don't care for sname (server hostname) */
donatien 0:8e01dca41002 1492 pbuf_copy_partial(p, dhcp->boot_file_name, DHCP_FILE_LEN-1, DHCP_FILE_OFS);
donatien 0:8e01dca41002 1493 /* make sure the string is really NULL-terminated */
donatien 0:8e01dca41002 1494 dhcp->boot_file_name[DHCP_FILE_LEN-1] = 0;
donatien 0:8e01dca41002 1495 }
donatien 0:8e01dca41002 1496 #endif /* LWIP_DHCP_BOOTP_FILE */
donatien 0:8e01dca41002 1497 }
donatien 0:8e01dca41002 1498 if (parse_file_as_options) {
donatien 0:8e01dca41002 1499 /* if both are overloaded, parse file first and then sname (RFC 2131 ch. 4.1) */
donatien 0:8e01dca41002 1500 parse_file_as_options = 0;
donatien 0:8e01dca41002 1501 options_idx = DHCP_FILE_OFS;
donatien 0:8e01dca41002 1502 options_idx_max = DHCP_FILE_OFS + DHCP_FILE_LEN;
donatien 0:8e01dca41002 1503 goto again;
donatien 0:8e01dca41002 1504 } else if (parse_sname_as_options) {
donatien 0:8e01dca41002 1505 parse_sname_as_options = 0;
donatien 0:8e01dca41002 1506 options_idx = DHCP_SNAME_OFS;
donatien 0:8e01dca41002 1507 options_idx_max = DHCP_SNAME_OFS + DHCP_SNAME_LEN;
donatien 0:8e01dca41002 1508 goto again;
donatien 0:8e01dca41002 1509 }
donatien 0:8e01dca41002 1510 return ERR_OK;
donatien 0:8e01dca41002 1511 }
donatien 0:8e01dca41002 1512
donatien 0:8e01dca41002 1513 /**
donatien 0:8e01dca41002 1514 * If an incoming DHCP message is in response to us, then trigger the state machine
donatien 0:8e01dca41002 1515 */
donatien 0:8e01dca41002 1516 static void
donatien 0:8e01dca41002 1517 dhcp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port)
donatien 0:8e01dca41002 1518 {
donatien 0:8e01dca41002 1519 struct netif *netif = (struct netif *)arg;
donatien 0:8e01dca41002 1520 struct dhcp *dhcp = netif->dhcp;
donatien 0:8e01dca41002 1521 struct dhcp_msg *reply_msg = (struct dhcp_msg *)p->payload;
donatien 0:8e01dca41002 1522 u8_t msg_type;
donatien 0:8e01dca41002 1523 u8_t i;
donatien 0:8e01dca41002 1524 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,
donatien 0:8e01dca41002 1525 ip4_addr1_16(addr), ip4_addr2_16(addr), ip4_addr3_16(addr), ip4_addr4_16(addr), port));
donatien 0:8e01dca41002 1526 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("pbuf->len = %"U16_F"\n", p->len));
donatien 0:8e01dca41002 1527 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("pbuf->tot_len = %"U16_F"\n", p->tot_len));
donatien 0:8e01dca41002 1528 /* prevent warnings about unused arguments */
donatien 0:8e01dca41002 1529 LWIP_UNUSED_ARG(pcb);
donatien 0:8e01dca41002 1530 LWIP_UNUSED_ARG(addr);
donatien 0:8e01dca41002 1531 LWIP_UNUSED_ARG(port);
donatien 0:8e01dca41002 1532
donatien 0:8e01dca41002 1533 LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
donatien 0:8e01dca41002 1534
donatien 0:8e01dca41002 1535 if (p->len < DHCP_MIN_REPLY_LEN) {
donatien 0:8e01dca41002 1536 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("DHCP reply message or pbuf too short\n"));
donatien 0:8e01dca41002 1537 goto free_pbuf_and_return;
donatien 0:8e01dca41002 1538 }
donatien 0:8e01dca41002 1539
donatien 0:8e01dca41002 1540 if (reply_msg->op != DHCP_BOOTREPLY) {
donatien 0:8e01dca41002 1541 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));
donatien 0:8e01dca41002 1542 goto free_pbuf_and_return;
donatien 0:8e01dca41002 1543 }
donatien 0:8e01dca41002 1544 /* iterate through hardware address and match against DHCP message */
donatien 0:8e01dca41002 1545 for (i = 0; i < netif->hwaddr_len; i++) {
donatien 0:8e01dca41002 1546 if (netif->hwaddr[i] != reply_msg->chaddr[i]) {
donatien 0:8e01dca41002 1547 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
donatien 0:8e01dca41002 1548 ("netif->hwaddr[%"U16_F"]==%02"X16_F" != reply_msg->chaddr[%"U16_F"]==%02"X16_F"\n",
donatien 0:8e01dca41002 1549 (u16_t)i, (u16_t)netif->hwaddr[i], (u16_t)i, (u16_t)reply_msg->chaddr[i]));
donatien 0:8e01dca41002 1550 goto free_pbuf_and_return;
donatien 0:8e01dca41002 1551 }
donatien 0:8e01dca41002 1552 }
donatien 0:8e01dca41002 1553 /* match transaction ID against what we expected */
donatien 0:8e01dca41002 1554 if (ntohl(reply_msg->xid) != dhcp->xid) {
donatien 0:8e01dca41002 1555 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
donatien 0:8e01dca41002 1556 ("transaction id mismatch reply_msg->xid(%"X32_F")!=dhcp->xid(%"X32_F")\n",ntohl(reply_msg->xid),dhcp->xid));
donatien 0:8e01dca41002 1557 goto free_pbuf_and_return;
donatien 0:8e01dca41002 1558 }
donatien 0:8e01dca41002 1559 /* option fields could be unfold? */
donatien 0:8e01dca41002 1560 if (dhcp_parse_reply(dhcp, p) != ERR_OK) {
donatien 0:8e01dca41002 1561 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
donatien 0:8e01dca41002 1562 ("problem unfolding DHCP message - too short on memory?\n"));
donatien 0:8e01dca41002 1563 goto free_pbuf_and_return;
donatien 0:8e01dca41002 1564 }
donatien 0:8e01dca41002 1565
donatien 0:8e01dca41002 1566 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("searching DHCP_OPTION_MESSAGE_TYPE\n"));
donatien 0:8e01dca41002 1567 /* obtain pointer to DHCP message type */
donatien 0:8e01dca41002 1568 if (!dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE)) {
donatien 0:8e01dca41002 1569 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("DHCP_OPTION_MESSAGE_TYPE option not found\n"));
donatien 0:8e01dca41002 1570 goto free_pbuf_and_return;
donatien 0:8e01dca41002 1571 }
donatien 0:8e01dca41002 1572
donatien 0:8e01dca41002 1573 /* read DHCP message type */
donatien 0:8e01dca41002 1574 msg_type = (u8_t)dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE);
donatien 0:8e01dca41002 1575 /* message type is DHCP ACK? */
donatien 0:8e01dca41002 1576 if (msg_type == DHCP_ACK) {
donatien 0:8e01dca41002 1577 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_ACK received\n"));
donatien 0:8e01dca41002 1578 /* in requesting state? */
donatien 0:8e01dca41002 1579 if (dhcp->state == DHCP_REQUESTING) {
donatien 0:8e01dca41002 1580 dhcp_handle_ack(netif);
donatien 0:8e01dca41002 1581 #if DHCP_DOES_ARP_CHECK
donatien 0:8e01dca41002 1582 /* check if the acknowledged lease address is already in use */
donatien 0:8e01dca41002 1583 dhcp_check(netif);
donatien 0:8e01dca41002 1584 #else
donatien 0:8e01dca41002 1585 /* bind interface to the acknowledged lease address */
donatien 0:8e01dca41002 1586 dhcp_bind(netif);
donatien 0:8e01dca41002 1587 #endif
donatien 0:8e01dca41002 1588 }
donatien 0:8e01dca41002 1589 /* already bound to the given lease address? */
donatien 0:8e01dca41002 1590 else if ((dhcp->state == DHCP_REBOOTING) || (dhcp->state == DHCP_REBINDING) || (dhcp->state == DHCP_RENEWING)) {
donatien 0:8e01dca41002 1591 dhcp_bind(netif);
donatien 0:8e01dca41002 1592 }
donatien 0:8e01dca41002 1593 }
donatien 0:8e01dca41002 1594 /* received a DHCP_NAK in appropriate state? */
donatien 0:8e01dca41002 1595 else if ((msg_type == DHCP_NAK) &&
donatien 0:8e01dca41002 1596 ((dhcp->state == DHCP_REBOOTING) || (dhcp->state == DHCP_REQUESTING) ||
donatien 0:8e01dca41002 1597 (dhcp->state == DHCP_REBINDING) || (dhcp->state == DHCP_RENEWING ))) {
donatien 0:8e01dca41002 1598 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_NAK received\n"));
donatien 0:8e01dca41002 1599 dhcp_handle_nak(netif);
donatien 0:8e01dca41002 1600 }
donatien 0:8e01dca41002 1601 /* received a DHCP_OFFER in DHCP_SELECTING state? */
donatien 0:8e01dca41002 1602 else if ((msg_type == DHCP_OFFER) && (dhcp->state == DHCP_SELECTING)) {
donatien 0:8e01dca41002 1603 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_OFFER received in DHCP_SELECTING state\n"));
donatien 0:8e01dca41002 1604 dhcp->request_timeout = 0;
donatien 0:8e01dca41002 1605 /* remember offered lease */
donatien 0:8e01dca41002 1606 dhcp_handle_offer(netif);
donatien 0:8e01dca41002 1607 }
donatien 0:8e01dca41002 1608 free_pbuf_and_return:
donatien 0:8e01dca41002 1609 dhcp->msg_in = NULL;
donatien 0:8e01dca41002 1610 pbuf_free(p);
donatien 0:8e01dca41002 1611 }
donatien 0:8e01dca41002 1612
donatien 0:8e01dca41002 1613 /**
donatien 0:8e01dca41002 1614 * Create a DHCP request, fill in common headers
donatien 0:8e01dca41002 1615 *
donatien 0:8e01dca41002 1616 * @param netif the netif under DHCP control
donatien 0:8e01dca41002 1617 * @param dhcp dhcp control struct
donatien 0:8e01dca41002 1618 * @param message_type message type of the request
donatien 0:8e01dca41002 1619 */
donatien 0:8e01dca41002 1620 static err_t
donatien 0:8e01dca41002 1621 dhcp_create_msg(struct netif *netif, struct dhcp *dhcp, u8_t message_type)
donatien 0:8e01dca41002 1622 {
donatien 0:8e01dca41002 1623 u16_t i;
donatien 0:8e01dca41002 1624 #ifndef DHCP_GLOBAL_XID
donatien 0:8e01dca41002 1625 /** default global transaction identifier starting value (easy to match
donatien 0:8e01dca41002 1626 * with a packet analyser). We simply increment for each new request.
donatien 0:8e01dca41002 1627 * Predefine DHCP_GLOBAL_XID to a better value or a function call to generate one
donatien 0:8e01dca41002 1628 * at runtime, any supporting function prototypes can be defined in DHCP_GLOBAL_XID_HEADER */
donatien 0:8e01dca41002 1629 static u32_t xid = 0xABCD0000;
donatien 0:8e01dca41002 1630 #else
donatien 0:8e01dca41002 1631 static u32_t xid;
donatien 0:8e01dca41002 1632 static u8_t xid_initialised = 0;
donatien 0:8e01dca41002 1633 if (!xid_initialised) {
donatien 0:8e01dca41002 1634 xid = DHCP_GLOBAL_XID;
donatien 0:8e01dca41002 1635 xid_initialised = !xid_initialised;
donatien 0:8e01dca41002 1636 }
donatien 0:8e01dca41002 1637 #endif
donatien 0:8e01dca41002 1638 LWIP_ERROR("dhcp_create_msg: netif != NULL", (netif != NULL), return ERR_ARG;);
donatien 0:8e01dca41002 1639 LWIP_ERROR("dhcp_create_msg: dhcp != NULL", (dhcp != NULL), return ERR_VAL;);
donatien 0:8e01dca41002 1640 LWIP_ASSERT("dhcp_create_msg: dhcp->p_out == NULL", dhcp->p_out == NULL);
donatien 0:8e01dca41002 1641 LWIP_ASSERT("dhcp_create_msg: dhcp->msg_out == NULL", dhcp->msg_out == NULL);
donatien 0:8e01dca41002 1642 dhcp->p_out = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct dhcp_msg), PBUF_RAM);
donatien 0:8e01dca41002 1643 if (dhcp->p_out == NULL) {
donatien 0:8e01dca41002 1644 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
donatien 0:8e01dca41002 1645 ("dhcp_create_msg(): could not allocate pbuf\n"));
donatien 0:8e01dca41002 1646 return ERR_MEM;
donatien 0:8e01dca41002 1647 }
donatien 0:8e01dca41002 1648 LWIP_ASSERT("dhcp_create_msg: check that first pbuf can hold struct dhcp_msg",
donatien 0:8e01dca41002 1649 (dhcp->p_out->len >= sizeof(struct dhcp_msg)));
donatien 0:8e01dca41002 1650
donatien 0:8e01dca41002 1651 /* reuse transaction identifier in retransmissions */
donatien 0:8e01dca41002 1652 if (dhcp->tries == 0) {
donatien 0:8e01dca41002 1653 xid++;
donatien 0:8e01dca41002 1654 }
donatien 0:8e01dca41002 1655 dhcp->xid = xid;
donatien 0:8e01dca41002 1656 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE,
donatien 0:8e01dca41002 1657 ("transaction id xid(%"X32_F")\n", xid));
donatien 0:8e01dca41002 1658
donatien 0:8e01dca41002 1659 dhcp->msg_out = (struct dhcp_msg *)dhcp->p_out->payload;
donatien 0:8e01dca41002 1660
donatien 0:8e01dca41002 1661 dhcp->msg_out->op = DHCP_BOOTREQUEST;
donatien 0:8e01dca41002 1662 /* TODO: make link layer independent */
donatien 0:8e01dca41002 1663 dhcp->msg_out->htype = DHCP_HTYPE_ETH;
donatien 0:8e01dca41002 1664 dhcp->msg_out->hlen = netif->hwaddr_len;
donatien 0:8e01dca41002 1665 dhcp->msg_out->hops = 0;
donatien 0:8e01dca41002 1666 dhcp->msg_out->xid = htonl(dhcp->xid);
donatien 0:8e01dca41002 1667 dhcp->msg_out->secs = 0;
donatien 0:8e01dca41002 1668 /* we don't need the broadcast flag since we can receive unicast traffic
donatien 0:8e01dca41002 1669 before being fully configured! */
donatien 0:8e01dca41002 1670 dhcp->msg_out->flags = 0;
donatien 0:8e01dca41002 1671 ip_addr_set_zero(&dhcp->msg_out->ciaddr);
donatien 0:8e01dca41002 1672 /* set ciaddr to netif->ip_addr based on message_type and state */
donatien 0:8e01dca41002 1673 if ((message_type == DHCP_INFORM) || (message_type == DHCP_DECLINE) ||
donatien 0:8e01dca41002 1674 ((message_type == DHCP_REQUEST) && /* DHCP_BOUND not used for sending! */
donatien 0:8e01dca41002 1675 ((dhcp->state==DHCP_RENEWING) || dhcp->state==DHCP_REBINDING))) {
donatien 0:8e01dca41002 1676 ip_addr_copy(dhcp->msg_out->ciaddr, netif->ip_addr);
donatien 0:8e01dca41002 1677 }
donatien 0:8e01dca41002 1678 ip_addr_set_zero(&dhcp->msg_out->yiaddr);
donatien 0:8e01dca41002 1679 ip_addr_set_zero(&dhcp->msg_out->siaddr);
donatien 0:8e01dca41002 1680 ip_addr_set_zero(&dhcp->msg_out->giaddr);
donatien 0:8e01dca41002 1681 for (i = 0; i < DHCP_CHADDR_LEN; i++) {
donatien 0:8e01dca41002 1682 /* copy netif hardware address, pad with zeroes */
donatien 0:8e01dca41002 1683 dhcp->msg_out->chaddr[i] = (i < netif->hwaddr_len) ? netif->hwaddr[i] : 0/* pad byte*/;
donatien 0:8e01dca41002 1684 }
donatien 0:8e01dca41002 1685 for (i = 0; i < DHCP_SNAME_LEN; i++) {
donatien 0:8e01dca41002 1686 dhcp->msg_out->sname[i] = 0;
donatien 0:8e01dca41002 1687 }
donatien 0:8e01dca41002 1688 for (i = 0; i < DHCP_FILE_LEN; i++) {
donatien 0:8e01dca41002 1689 dhcp->msg_out->file[i] = 0;
donatien 0:8e01dca41002 1690 }
donatien 0:8e01dca41002 1691 dhcp->msg_out->cookie = PP_HTONL(DHCP_MAGIC_COOKIE);
donatien 0:8e01dca41002 1692 dhcp->options_out_len = 0;
donatien 0:8e01dca41002 1693 /* fill options field with an incrementing array (for debugging purposes) */
donatien 0:8e01dca41002 1694 for (i = 0; i < DHCP_OPTIONS_LEN; i++) {
donatien 0:8e01dca41002 1695 dhcp->msg_out->options[i] = (u8_t)i; /* for debugging only, no matter if truncated */
donatien 0:8e01dca41002 1696 }
donatien 0:8e01dca41002 1697 /* Add option MESSAGE_TYPE */
donatien 0:8e01dca41002 1698 dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
donatien 0:8e01dca41002 1699 dhcp_option_byte(dhcp, message_type);
donatien 0:8e01dca41002 1700 return ERR_OK;
donatien 0:8e01dca41002 1701 }
donatien 0:8e01dca41002 1702
donatien 0:8e01dca41002 1703 /**
donatien 0:8e01dca41002 1704 * Free previously allocated memory used to send a DHCP request.
donatien 0:8e01dca41002 1705 *
donatien 0:8e01dca41002 1706 * @param dhcp the dhcp struct to free the request from
donatien 0:8e01dca41002 1707 */
donatien 0:8e01dca41002 1708 static void
donatien 0:8e01dca41002 1709 dhcp_delete_msg(struct dhcp *dhcp)
donatien 0:8e01dca41002 1710 {
donatien 0:8e01dca41002 1711 LWIP_ERROR("dhcp_delete_msg: dhcp != NULL", (dhcp != NULL), return;);
donatien 0:8e01dca41002 1712 LWIP_ASSERT("dhcp_delete_msg: dhcp->p_out != NULL", dhcp->p_out != NULL);
donatien 0:8e01dca41002 1713 LWIP_ASSERT("dhcp_delete_msg: dhcp->msg_out != NULL", dhcp->msg_out != NULL);
donatien 0:8e01dca41002 1714 if (dhcp->p_out != NULL) {
donatien 0:8e01dca41002 1715 pbuf_free(dhcp->p_out);
donatien 0:8e01dca41002 1716 }
donatien 0:8e01dca41002 1717 dhcp->p_out = NULL;
donatien 0:8e01dca41002 1718 dhcp->msg_out = NULL;
donatien 0:8e01dca41002 1719 }
donatien 0:8e01dca41002 1720
donatien 0:8e01dca41002 1721 /**
donatien 0:8e01dca41002 1722 * Add a DHCP message trailer
donatien 0:8e01dca41002 1723 *
donatien 0:8e01dca41002 1724 * Adds the END option to the DHCP message, and if
donatien 0:8e01dca41002 1725 * necessary, up to three padding bytes.
donatien 0:8e01dca41002 1726 *
donatien 0:8e01dca41002 1727 * @param dhcp DHCP state structure
donatien 0:8e01dca41002 1728 */
donatien 0:8e01dca41002 1729 static void
donatien 0:8e01dca41002 1730 dhcp_option_trailer(struct dhcp *dhcp)
donatien 0:8e01dca41002 1731 {
donatien 0:8e01dca41002 1732 LWIP_ERROR("dhcp_option_trailer: dhcp != NULL", (dhcp != NULL), return;);
donatien 0:8e01dca41002 1733 LWIP_ASSERT("dhcp_option_trailer: dhcp->msg_out != NULL\n", dhcp->msg_out != NULL);
donatien 0:8e01dca41002 1734 LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
donatien 0:8e01dca41002 1735 dhcp->msg_out->options[dhcp->options_out_len++] = DHCP_OPTION_END;
donatien 0:8e01dca41002 1736 /* packet is too small, or not 4 byte aligned? */
donatien 0:8e01dca41002 1737 while ((dhcp->options_out_len < DHCP_MIN_OPTIONS_LEN) || (dhcp->options_out_len & 3)) {
donatien 0:8e01dca41002 1738 /* LWIP_DEBUGF(DHCP_DEBUG,("dhcp_option_trailer:dhcp->options_out_len=%"U16_F", DHCP_OPTIONS_LEN=%"U16_F, dhcp->options_out_len, DHCP_OPTIONS_LEN)); */
donatien 0:8e01dca41002 1739 LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
donatien 0:8e01dca41002 1740 /* add a fill/padding byte */
donatien 0:8e01dca41002 1741 dhcp->msg_out->options[dhcp->options_out_len++] = 0;
donatien 0:8e01dca41002 1742 }
donatien 0:8e01dca41002 1743 }
donatien 0:8e01dca41002 1744
donatien 0:8e01dca41002 1745 #endif /* LWIP_DHCP */