Used in Live Traffic Update Nokia LCD Display Project

Fork of NetServices by Segundo Equipo

Committer:
segundo
Date:
Tue Nov 09 20:54:15 2010 +0000
Revision:
0:ac1725ba162c
Child:
8:92b57208ab99

        

Who changed what in which revision?

UserRevisionLine numberNew contents of line
segundo 0:ac1725ba162c 1 /**
segundo 0:ac1725ba162c 2 * @file
segundo 0:ac1725ba162c 3 * Dynamic Host Configuration Protocol client
segundo 0:ac1725ba162c 4 *
segundo 0:ac1725ba162c 5 */
segundo 0:ac1725ba162c 6
segundo 0:ac1725ba162c 7 /*
segundo 0:ac1725ba162c 8 *
segundo 0:ac1725ba162c 9 * Copyright (c) 2001-2004 Leon Woestenberg <leon.woestenberg@gmx.net>
segundo 0:ac1725ba162c 10 * Copyright (c) 2001-2004 Axon Digital Design B.V., The Netherlands.
segundo 0:ac1725ba162c 11 * All rights reserved.
segundo 0:ac1725ba162c 12 *
segundo 0:ac1725ba162c 13 * Redistribution and use in source and binary forms, with or without modification,
segundo 0:ac1725ba162c 14 * are permitted provided that the following conditions are met:
segundo 0:ac1725ba162c 15 *
segundo 0:ac1725ba162c 16 * 1. Redistributions of source code must retain the above copyright notice,
segundo 0:ac1725ba162c 17 * this list of conditions and the following disclaimer.
segundo 0:ac1725ba162c 18 * 2. Redistributions in binary form must reproduce the above copyright notice,
segundo 0:ac1725ba162c 19 * this list of conditions and the following disclaimer in the documentation
segundo 0:ac1725ba162c 20 * and/or other materials provided with the distribution.
segundo 0:ac1725ba162c 21 * 3. The name of the author may not be used to endorse or promote products
segundo 0:ac1725ba162c 22 * derived from this software without specific prior written permission.
segundo 0:ac1725ba162c 23 *
segundo 0:ac1725ba162c 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
segundo 0:ac1725ba162c 25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
segundo 0:ac1725ba162c 26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
segundo 0:ac1725ba162c 27 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
segundo 0:ac1725ba162c 28 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
segundo 0:ac1725ba162c 29 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
segundo 0:ac1725ba162c 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
segundo 0:ac1725ba162c 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
segundo 0:ac1725ba162c 32 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
segundo 0:ac1725ba162c 33 * OF SUCH DAMAGE.
segundo 0:ac1725ba162c 34 *
segundo 0:ac1725ba162c 35 * This file is a contribution to the lwIP TCP/IP stack.
segundo 0:ac1725ba162c 36 * The Swedish Institute of Computer Science and Adam Dunkels
segundo 0:ac1725ba162c 37 * are specifically granted permission to redistribute this
segundo 0:ac1725ba162c 38 * source code.
segundo 0:ac1725ba162c 39 *
segundo 0:ac1725ba162c 40 * Author: Leon Woestenberg <leon.woestenberg@gmx.net>
segundo 0:ac1725ba162c 41 *
segundo 0:ac1725ba162c 42 * This is a DHCP client for the lwIP TCP/IP stack. It aims to conform
segundo 0:ac1725ba162c 43 * with RFC 2131 and RFC 2132.
segundo 0:ac1725ba162c 44 *
segundo 0:ac1725ba162c 45 * TODO:
segundo 0:ac1725ba162c 46 * - Support for interfaces other than Ethernet (SLIP, PPP, ...)
segundo 0:ac1725ba162c 47 *
segundo 0:ac1725ba162c 48 * Please coordinate changes and requests with Leon Woestenberg
segundo 0:ac1725ba162c 49 * <leon.woestenberg@gmx.net>
segundo 0:ac1725ba162c 50 *
segundo 0:ac1725ba162c 51 * Integration with your code:
segundo 0:ac1725ba162c 52 *
segundo 0:ac1725ba162c 53 * In lwip/dhcp.h
segundo 0:ac1725ba162c 54 * #define DHCP_COARSE_TIMER_SECS (recommended 60 which is a minute)
segundo 0:ac1725ba162c 55 * #define DHCP_FINE_TIMER_MSECS (recommended 500 which equals TCP coarse timer)
segundo 0:ac1725ba162c 56 *
segundo 0:ac1725ba162c 57 * Then have your application call dhcp_coarse_tmr() and
segundo 0:ac1725ba162c 58 * dhcp_fine_tmr() on the defined intervals.
segundo 0:ac1725ba162c 59 *
segundo 0:ac1725ba162c 60 * dhcp_start(struct netif *netif);
segundo 0:ac1725ba162c 61 * starts a DHCP client instance which configures the interface by
segundo 0:ac1725ba162c 62 * obtaining an IP address lease and maintaining it.
segundo 0:ac1725ba162c 63 *
segundo 0:ac1725ba162c 64 * Use dhcp_release(netif) to end the lease and use dhcp_stop(netif)
segundo 0:ac1725ba162c 65 * to remove the DHCP client.
segundo 0:ac1725ba162c 66 *
segundo 0:ac1725ba162c 67 */
segundo 0:ac1725ba162c 68
segundo 0:ac1725ba162c 69 #include "lwip/opt.h"
segundo 0:ac1725ba162c 70
segundo 0:ac1725ba162c 71 #if LWIP_DHCP /* don't build if not configured for use in lwipopts.h */
segundo 0:ac1725ba162c 72
segundo 0:ac1725ba162c 73 #include "lwip/stats.h"
segundo 0:ac1725ba162c 74 #include "lwip/mem.h"
segundo 0:ac1725ba162c 75 #include "lwip/udp.h"
segundo 0:ac1725ba162c 76 #include "lwip/ip_addr.h"
segundo 0:ac1725ba162c 77 #include "lwip/netif.h"
segundo 0:ac1725ba162c 78 #include "lwip/def.h"
segundo 0:ac1725ba162c 79 #include "lwip/sys.h"
segundo 0:ac1725ba162c 80 #include "lwip/dhcp.h"
segundo 0:ac1725ba162c 81 #include "lwip/autoip.h"
segundo 0:ac1725ba162c 82 #include "lwip/dns.h"
segundo 0:ac1725ba162c 83 #include "netif/etharp.h"
segundo 0:ac1725ba162c 84
segundo 0:ac1725ba162c 85 #include <string.h>
segundo 0:ac1725ba162c 86
segundo 0:ac1725ba162c 87 /** Default for DHCP_GLOBAL_XID is 0xABCD0000
segundo 0:ac1725ba162c 88 * This can be changed by defining DHCP_GLOBAL_XID and DHCP_GLOBAL_XID_HEADER, e.g.
segundo 0:ac1725ba162c 89 * #define DHCP_GLOBAL_XID_HEADER "stdlib.h"
segundo 0:ac1725ba162c 90 * #define DHCP_GLOBAL_XID rand()
segundo 0:ac1725ba162c 91 */
segundo 0:ac1725ba162c 92 #ifdef DHCP_GLOBAL_XID_HEADER
segundo 0:ac1725ba162c 93 #include DHCP_GLOBAL_XID_HEADER /* include optional starting XID generation prototypes */
segundo 0:ac1725ba162c 94 #endif
segundo 0:ac1725ba162c 95
segundo 0:ac1725ba162c 96 /** DHCP_OPTION_MAX_MSG_SIZE is set to the MTU
segundo 0:ac1725ba162c 97 * MTU is checked to be big enough in dhcp_start */
segundo 0:ac1725ba162c 98 #define DHCP_MAX_MSG_LEN(netif) (netif->mtu)
segundo 0:ac1725ba162c 99 #define DHCP_MAX_MSG_LEN_MIN_REQUIRED 576
segundo 0:ac1725ba162c 100 /** Minimum length for reply before packet is parsed */
segundo 0:ac1725ba162c 101 #define DHCP_MIN_REPLY_LEN 44
segundo 0:ac1725ba162c 102
segundo 0:ac1725ba162c 103 #define REBOOT_TRIES 2
segundo 0:ac1725ba162c 104
segundo 0:ac1725ba162c 105 /** Option handling: options are parsed in dhcp_parse_reply
segundo 0:ac1725ba162c 106 * and saved in an array where other functions can load them from.
segundo 0:ac1725ba162c 107 * This might be moved into the struct dhcp (not necessarily since
segundo 0:ac1725ba162c 108 * lwIP is single-threaded and the array is only used while in recv
segundo 0:ac1725ba162c 109 * callback). */
segundo 0:ac1725ba162c 110 #define DHCP_OPTION_IDX_OVERLOAD 0
segundo 0:ac1725ba162c 111 #define DHCP_OPTION_IDX_MSG_TYPE 1
segundo 0:ac1725ba162c 112 #define DHCP_OPTION_IDX_SERVER_ID 2
segundo 0:ac1725ba162c 113 #define DHCP_OPTION_IDX_LEASE_TIME 3
segundo 0:ac1725ba162c 114 #define DHCP_OPTION_IDX_T1 4
segundo 0:ac1725ba162c 115 #define DHCP_OPTION_IDX_T2 5
segundo 0:ac1725ba162c 116 #define DHCP_OPTION_IDX_SUBNET_MASK 6
segundo 0:ac1725ba162c 117 #define DHCP_OPTION_IDX_ROUTER 7
segundo 0:ac1725ba162c 118 #define DHCP_OPTION_IDX_DNS_SERVER 8
segundo 0:ac1725ba162c 119 #define DHCP_OPTION_IDX_MAX (DHCP_OPTION_IDX_DNS_SERVER + DNS_MAX_SERVERS)
segundo 0:ac1725ba162c 120
segundo 0:ac1725ba162c 121 /** Holds the decoded option values, only valid while in dhcp_recv.
segundo 0:ac1725ba162c 122 @todo: move this into struct dhcp? */
segundo 0:ac1725ba162c 123 u32_t dhcp_rx_options_val[DHCP_OPTION_IDX_MAX];
segundo 0:ac1725ba162c 124 /** Holds a flag which option was received and is contained in dhcp_rx_options_val,
segundo 0:ac1725ba162c 125 only valid while in dhcp_recv.
segundo 0:ac1725ba162c 126 @todo: move this into struct dhcp? */
segundo 0:ac1725ba162c 127 u8_t dhcp_rx_options_given[DHCP_OPTION_IDX_MAX];
segundo 0:ac1725ba162c 128
segundo 0:ac1725ba162c 129 #define dhcp_option_given(dhcp, idx) (dhcp_rx_options_given[idx] != 0)
segundo 0:ac1725ba162c 130 #define dhcp_got_option(dhcp, idx) (dhcp_rx_options_given[idx] = 1)
segundo 0:ac1725ba162c 131 #define dhcp_clear_option(dhcp, idx) (dhcp_rx_options_given[idx] = 0)
segundo 0:ac1725ba162c 132 #define dhcp_clear_all_options(dhcp) (memset(dhcp_rx_options_given, 0, sizeof(dhcp_rx_options_given)))
segundo 0:ac1725ba162c 133 #define dhcp_get_option_value(dhcp, idx) (dhcp_rx_options_val[idx])
segundo 0:ac1725ba162c 134 #define dhcp_set_option_value(dhcp, idx, val) (dhcp_rx_options_val[idx] = (val))
segundo 0:ac1725ba162c 135
segundo 0:ac1725ba162c 136
segundo 0:ac1725ba162c 137 /* DHCP client state machine functions */
segundo 0:ac1725ba162c 138 static err_t dhcp_discover(struct netif *netif);
segundo 0:ac1725ba162c 139 static err_t dhcp_select(struct netif *netif);
segundo 0:ac1725ba162c 140 static void dhcp_bind(struct netif *netif);
segundo 0:ac1725ba162c 141 #if DHCP_DOES_ARP_CHECK
segundo 0:ac1725ba162c 142 static err_t dhcp_decline(struct netif *netif);
segundo 0:ac1725ba162c 143 #endif /* DHCP_DOES_ARP_CHECK */
segundo 0:ac1725ba162c 144 static err_t dhcp_rebind(struct netif *netif);
segundo 0:ac1725ba162c 145 static err_t dhcp_reboot(struct netif *netif);
segundo 0:ac1725ba162c 146 static void dhcp_set_state(struct dhcp *dhcp, u8_t new_state);
segundo 0:ac1725ba162c 147
segundo 0:ac1725ba162c 148 /* receive, unfold, parse and free incoming messages */
segundo 0:ac1725ba162c 149 static void dhcp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port);
segundo 0:ac1725ba162c 150
segundo 0:ac1725ba162c 151 /* set the DHCP timers */
segundo 0:ac1725ba162c 152 static void dhcp_timeout(struct netif *netif);
segundo 0:ac1725ba162c 153 static void dhcp_t1_timeout(struct netif *netif);
segundo 0:ac1725ba162c 154 static void dhcp_t2_timeout(struct netif *netif);
segundo 0:ac1725ba162c 155
segundo 0:ac1725ba162c 156 /* build outgoing messages */
segundo 0:ac1725ba162c 157 /* create a DHCP message, fill in common headers */
segundo 0:ac1725ba162c 158 static err_t dhcp_create_msg(struct netif *netif, struct dhcp *dhcp, u8_t message_type);
segundo 0:ac1725ba162c 159 /* free a DHCP request */
segundo 0:ac1725ba162c 160 static void dhcp_delete_msg(struct dhcp *dhcp);
segundo 0:ac1725ba162c 161 /* add a DHCP option (type, then length in bytes) */
segundo 0:ac1725ba162c 162 static void dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len);
segundo 0:ac1725ba162c 163 /* add option values */
segundo 0:ac1725ba162c 164 static void dhcp_option_byte(struct dhcp *dhcp, u8_t value);
segundo 0:ac1725ba162c 165 static void dhcp_option_short(struct dhcp *dhcp, u16_t value);
segundo 0:ac1725ba162c 166 static void dhcp_option_long(struct dhcp *dhcp, u32_t value);
segundo 0:ac1725ba162c 167 /* always add the DHCP options trailer to end and pad */
segundo 0:ac1725ba162c 168 static void dhcp_option_trailer(struct dhcp *dhcp);
segundo 0:ac1725ba162c 169
segundo 0:ac1725ba162c 170 /**
segundo 0:ac1725ba162c 171 * Back-off the DHCP client (because of a received NAK response).
segundo 0:ac1725ba162c 172 *
segundo 0:ac1725ba162c 173 * Back-off the DHCP client because of a received NAK. Receiving a
segundo 0:ac1725ba162c 174 * NAK means the client asked for something non-sensible, for
segundo 0:ac1725ba162c 175 * example when it tries to renew a lease obtained on another network.
segundo 0:ac1725ba162c 176 *
segundo 0:ac1725ba162c 177 * We clear any existing set IP address and restart DHCP negotiation
segundo 0:ac1725ba162c 178 * afresh (as per RFC2131 3.2.3).
segundo 0:ac1725ba162c 179 *
segundo 0:ac1725ba162c 180 * @param netif the netif under DHCP control
segundo 0:ac1725ba162c 181 */
segundo 0:ac1725ba162c 182 static void
segundo 0:ac1725ba162c 183 dhcp_handle_nak(struct netif *netif)
segundo 0:ac1725ba162c 184 {
segundo 0:ac1725ba162c 185 struct dhcp *dhcp = netif->dhcp;
segundo 0:ac1725ba162c 186 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_handle_nak(netif=%p) %c%c%"U16_F"\n",
segundo 0:ac1725ba162c 187 (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
segundo 0:ac1725ba162c 188 /* Set the interface down since the address must no longer be used, as per RFC2131 */
segundo 0:ac1725ba162c 189 netif_set_down(netif);
segundo 0:ac1725ba162c 190 /* remove IP address from interface */
segundo 0:ac1725ba162c 191 netif_set_ipaddr(netif, IP_ADDR_ANY);
segundo 0:ac1725ba162c 192 netif_set_gw(netif, IP_ADDR_ANY);
segundo 0:ac1725ba162c 193 netif_set_netmask(netif, IP_ADDR_ANY);
segundo 0:ac1725ba162c 194 /* Change to a defined state */
segundo 0:ac1725ba162c 195 dhcp_set_state(dhcp, DHCP_BACKING_OFF);
segundo 0:ac1725ba162c 196 /* We can immediately restart discovery */
segundo 0:ac1725ba162c 197 dhcp_discover(netif);
segundo 0:ac1725ba162c 198 }
segundo 0:ac1725ba162c 199
segundo 0:ac1725ba162c 200 #if DHCP_DOES_ARP_CHECK
segundo 0:ac1725ba162c 201 /**
segundo 0:ac1725ba162c 202 * Checks if the offered IP address is already in use.
segundo 0:ac1725ba162c 203 *
segundo 0:ac1725ba162c 204 * It does so by sending an ARP request for the offered address and
segundo 0:ac1725ba162c 205 * entering CHECKING state. If no ARP reply is received within a small
segundo 0:ac1725ba162c 206 * interval, the address is assumed to be free for use by us.
segundo 0:ac1725ba162c 207 *
segundo 0:ac1725ba162c 208 * @param netif the netif under DHCP control
segundo 0:ac1725ba162c 209 */
segundo 0:ac1725ba162c 210 static void
segundo 0:ac1725ba162c 211 dhcp_check(struct netif *netif)
segundo 0:ac1725ba162c 212 {
segundo 0:ac1725ba162c 213 struct dhcp *dhcp = netif->dhcp;
segundo 0:ac1725ba162c 214 err_t result;
segundo 0:ac1725ba162c 215 u16_t msecs;
segundo 0:ac1725ba162c 216 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_check(netif=%p) %c%c\n", (void *)netif, (s16_t)netif->name[0],
segundo 0:ac1725ba162c 217 (s16_t)netif->name[1]));
segundo 0:ac1725ba162c 218 dhcp_set_state(dhcp, DHCP_CHECKING);
segundo 0:ac1725ba162c 219 /* create an ARP query for the offered IP address, expecting that no host
segundo 0:ac1725ba162c 220 responds, as the IP address should not be in use. */
segundo 0:ac1725ba162c 221 result = etharp_query(netif, &dhcp->offered_ip_addr, NULL);
segundo 0:ac1725ba162c 222 if (result != ERR_OK) {
segundo 0:ac1725ba162c 223 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("dhcp_check: could not perform ARP query\n"));
segundo 0:ac1725ba162c 224 }
segundo 0:ac1725ba162c 225 dhcp->tries++;
segundo 0:ac1725ba162c 226 msecs = 500;
segundo 0:ac1725ba162c 227 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
segundo 0:ac1725ba162c 228 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_check(): set request timeout %"U16_F" msecs\n", msecs));
segundo 0:ac1725ba162c 229 }
segundo 0:ac1725ba162c 230 #endif /* DHCP_DOES_ARP_CHECK */
segundo 0:ac1725ba162c 231
segundo 0:ac1725ba162c 232 /**
segundo 0:ac1725ba162c 233 * Remember the configuration offered by a DHCP server.
segundo 0:ac1725ba162c 234 *
segundo 0:ac1725ba162c 235 * @param netif the netif under DHCP control
segundo 0:ac1725ba162c 236 */
segundo 0:ac1725ba162c 237 static void
segundo 0:ac1725ba162c 238 dhcp_handle_offer(struct netif *netif)
segundo 0:ac1725ba162c 239 {
segundo 0:ac1725ba162c 240 struct dhcp *dhcp = netif->dhcp;
segundo 0:ac1725ba162c 241 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_handle_offer(netif=%p) %c%c%"U16_F"\n",
segundo 0:ac1725ba162c 242 (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
segundo 0:ac1725ba162c 243 /* obtain the server address */
segundo 0:ac1725ba162c 244 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SERVER_ID)) {
segundo 0:ac1725ba162c 245 ip4_addr_set_u32(&dhcp->server_ip_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SERVER_ID)));
segundo 0:ac1725ba162c 246 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_handle_offer(): server 0x%08"X32_F"\n",
segundo 0:ac1725ba162c 247 ip4_addr_get_u32(&dhcp->server_ip_addr)));
segundo 0:ac1725ba162c 248 /* remember offered address */
segundo 0:ac1725ba162c 249 ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
segundo 0:ac1725ba162c 250 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_handle_offer(): offer for 0x%08"X32_F"\n",
segundo 0:ac1725ba162c 251 ip4_addr_get_u32(&dhcp->offered_ip_addr)));
segundo 0:ac1725ba162c 252
segundo 0:ac1725ba162c 253 dhcp_select(netif);
segundo 0:ac1725ba162c 254 } else {
segundo 0:ac1725ba162c 255 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
segundo 0:ac1725ba162c 256 ("dhcp_handle_offer(netif=%p) did not get server ID!\n", (void*)netif));
segundo 0:ac1725ba162c 257 }
segundo 0:ac1725ba162c 258 }
segundo 0:ac1725ba162c 259
segundo 0:ac1725ba162c 260 /**
segundo 0:ac1725ba162c 261 * Select a DHCP server offer out of all offers.
segundo 0:ac1725ba162c 262 *
segundo 0:ac1725ba162c 263 * Simply select the first offer received.
segundo 0:ac1725ba162c 264 *
segundo 0:ac1725ba162c 265 * @param netif the netif under DHCP control
segundo 0:ac1725ba162c 266 * @return lwIP specific error (see error.h)
segundo 0:ac1725ba162c 267 */
segundo 0:ac1725ba162c 268 static err_t
segundo 0:ac1725ba162c 269 dhcp_select(struct netif *netif)
segundo 0:ac1725ba162c 270 {
segundo 0:ac1725ba162c 271 struct dhcp *dhcp = netif->dhcp;
segundo 0:ac1725ba162c 272 err_t result;
segundo 0:ac1725ba162c 273 u16_t msecs;
segundo 0:ac1725ba162c 274
segundo 0:ac1725ba162c 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));
segundo 0:ac1725ba162c 276 dhcp_set_state(dhcp, DHCP_REQUESTING);
segundo 0:ac1725ba162c 277
segundo 0:ac1725ba162c 278 /* create and initialize the DHCP message header */
segundo 0:ac1725ba162c 279 result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
segundo 0:ac1725ba162c 280 if (result == ERR_OK) {
segundo 0:ac1725ba162c 281 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
segundo 0:ac1725ba162c 282 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
segundo 0:ac1725ba162c 283
segundo 0:ac1725ba162c 284 /* MUST request the offered IP address */
segundo 0:ac1725ba162c 285 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
segundo 0:ac1725ba162c 286 dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
segundo 0:ac1725ba162c 287
segundo 0:ac1725ba162c 288 dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
segundo 0:ac1725ba162c 289 dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->server_ip_addr)));
segundo 0:ac1725ba162c 290
segundo 0:ac1725ba162c 291 dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);
segundo 0:ac1725ba162c 292 dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
segundo 0:ac1725ba162c 293 dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
segundo 0:ac1725ba162c 294 dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
segundo 0:ac1725ba162c 295 dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
segundo 0:ac1725ba162c 296
segundo 0:ac1725ba162c 297 #if LWIP_NETIF_HOSTNAME
segundo 0:ac1725ba162c 298 if (netif->hostname != NULL) {
segundo 0:ac1725ba162c 299 const char *p = (const char*)netif->hostname;
segundo 0:ac1725ba162c 300 u8_t namelen = (u8_t)strlen(p);
segundo 0:ac1725ba162c 301 if (namelen > 0) {
segundo 0:ac1725ba162c 302 LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
segundo 0:ac1725ba162c 303 dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
segundo 0:ac1725ba162c 304 while (*p) {
segundo 0:ac1725ba162c 305 dhcp_option_byte(dhcp, *p++);
segundo 0:ac1725ba162c 306 }
segundo 0:ac1725ba162c 307 }
segundo 0:ac1725ba162c 308 }
segundo 0:ac1725ba162c 309 #endif /* LWIP_NETIF_HOSTNAME */
segundo 0:ac1725ba162c 310
segundo 0:ac1725ba162c 311 dhcp_option_trailer(dhcp);
segundo 0:ac1725ba162c 312 /* shrink the pbuf to the actual content length */
segundo 0:ac1725ba162c 313 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
segundo 0:ac1725ba162c 314
segundo 0:ac1725ba162c 315 /* send broadcast to any DHCP server */
segundo 0:ac1725ba162c 316 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
segundo 0:ac1725ba162c 317 dhcp_delete_msg(dhcp);
segundo 0:ac1725ba162c 318 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_select: REQUESTING\n"));
segundo 0:ac1725ba162c 319 } else {
segundo 0:ac1725ba162c 320 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("dhcp_select: could not allocate DHCP request\n"));
segundo 0:ac1725ba162c 321 }
segundo 0:ac1725ba162c 322 dhcp->tries++;
segundo 0:ac1725ba162c 323 msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
segundo 0:ac1725ba162c 324 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
segundo 0:ac1725ba162c 325 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_select(): set request timeout %"U16_F" msecs\n", msecs));
segundo 0:ac1725ba162c 326 return result;
segundo 0:ac1725ba162c 327 }
segundo 0:ac1725ba162c 328
segundo 0:ac1725ba162c 329 /**
segundo 0:ac1725ba162c 330 * The DHCP timer that checks for lease renewal/rebind timeouts.
segundo 0:ac1725ba162c 331 */
segundo 0:ac1725ba162c 332 void
segundo 0:ac1725ba162c 333 dhcp_coarse_tmr()
segundo 0:ac1725ba162c 334 {
segundo 0:ac1725ba162c 335 struct netif *netif = netif_list;
segundo 0:ac1725ba162c 336 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_coarse_tmr()\n"));
segundo 0:ac1725ba162c 337 /* iterate through all network interfaces */
segundo 0:ac1725ba162c 338 while (netif != NULL) {
segundo 0:ac1725ba162c 339 /* only act on DHCP configured interfaces */
segundo 0:ac1725ba162c 340 if (netif->dhcp != NULL) {
segundo 0:ac1725ba162c 341 /* timer is active (non zero), and triggers (zeroes) now? */
segundo 0:ac1725ba162c 342 if (netif->dhcp->t2_timeout-- == 1) {
segundo 0:ac1725ba162c 343 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t2 timeout\n"));
segundo 0:ac1725ba162c 344 /* this clients' rebind timeout triggered */
segundo 0:ac1725ba162c 345 dhcp_t2_timeout(netif);
segundo 0:ac1725ba162c 346 /* timer is active (non zero), and triggers (zeroes) now */
segundo 0:ac1725ba162c 347 } else if (netif->dhcp->t1_timeout-- == 1) {
segundo 0:ac1725ba162c 348 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t1 timeout\n"));
segundo 0:ac1725ba162c 349 /* this clients' renewal timeout triggered */
segundo 0:ac1725ba162c 350 dhcp_t1_timeout(netif);
segundo 0:ac1725ba162c 351 }
segundo 0:ac1725ba162c 352 }
segundo 0:ac1725ba162c 353 /* proceed to next netif */
segundo 0:ac1725ba162c 354 netif = netif->next;
segundo 0:ac1725ba162c 355 }
segundo 0:ac1725ba162c 356 }
segundo 0:ac1725ba162c 357
segundo 0:ac1725ba162c 358 /**
segundo 0:ac1725ba162c 359 * DHCP transaction timeout handling
segundo 0:ac1725ba162c 360 *
segundo 0:ac1725ba162c 361 * A DHCP server is expected to respond within a short period of time.
segundo 0:ac1725ba162c 362 * This timer checks whether an outstanding DHCP request is timed out.
segundo 0:ac1725ba162c 363 */
segundo 0:ac1725ba162c 364 void
segundo 0:ac1725ba162c 365 dhcp_fine_tmr()
segundo 0:ac1725ba162c 366 {
segundo 0:ac1725ba162c 367 struct netif *netif = netif_list;
segundo 0:ac1725ba162c 368 /* loop through netif's */
segundo 0:ac1725ba162c 369 while (netif != NULL) {
segundo 0:ac1725ba162c 370 /* only act on DHCP configured interfaces */
segundo 0:ac1725ba162c 371 if (netif->dhcp != NULL) {
segundo 0:ac1725ba162c 372 /* timer is active (non zero), and is about to trigger now */
segundo 0:ac1725ba162c 373 if (netif->dhcp->request_timeout > 1) {
segundo 0:ac1725ba162c 374 netif->dhcp->request_timeout--;
segundo 0:ac1725ba162c 375 }
segundo 0:ac1725ba162c 376 else if (netif->dhcp->request_timeout == 1) {
segundo 0:ac1725ba162c 377 netif->dhcp->request_timeout--;
segundo 0:ac1725ba162c 378 /* { netif->dhcp->request_timeout == 0 } */
segundo 0:ac1725ba162c 379 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_fine_tmr(): request timeout\n"));
segundo 0:ac1725ba162c 380 /* this client's request timeout triggered */
segundo 0:ac1725ba162c 381 dhcp_timeout(netif);
segundo 0:ac1725ba162c 382 }
segundo 0:ac1725ba162c 383 }
segundo 0:ac1725ba162c 384 /* proceed to next network interface */
segundo 0:ac1725ba162c 385 netif = netif->next;
segundo 0:ac1725ba162c 386 }
segundo 0:ac1725ba162c 387 }
segundo 0:ac1725ba162c 388
segundo 0:ac1725ba162c 389 /**
segundo 0:ac1725ba162c 390 * A DHCP negotiation transaction, or ARP request, has timed out.
segundo 0:ac1725ba162c 391 *
segundo 0:ac1725ba162c 392 * The timer that was started with the DHCP or ARP request has
segundo 0:ac1725ba162c 393 * timed out, indicating no response was received in time.
segundo 0:ac1725ba162c 394 *
segundo 0:ac1725ba162c 395 * @param netif the netif under DHCP control
segundo 0:ac1725ba162c 396 */
segundo 0:ac1725ba162c 397 static void
segundo 0:ac1725ba162c 398 dhcp_timeout(struct netif *netif)
segundo 0:ac1725ba162c 399 {
segundo 0:ac1725ba162c 400 struct dhcp *dhcp = netif->dhcp;
segundo 0:ac1725ba162c 401 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_timeout()\n"));
segundo 0:ac1725ba162c 402 /* back-off period has passed, or server selection timed out */
segundo 0:ac1725ba162c 403 if ((dhcp->state == DHCP_BACKING_OFF) || (dhcp->state == DHCP_SELECTING)) {
segundo 0:ac1725ba162c 404 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_timeout(): restarting discovery\n"));
segundo 0:ac1725ba162c 405 dhcp_discover(netif);
segundo 0:ac1725ba162c 406 /* receiving the requested lease timed out */
segundo 0:ac1725ba162c 407 } else if (dhcp->state == DHCP_REQUESTING) {
segundo 0:ac1725ba162c 408 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, DHCP request timed out\n"));
segundo 0:ac1725ba162c 409 if (dhcp->tries <= 5) {
segundo 0:ac1725ba162c 410 dhcp_select(netif);
segundo 0:ac1725ba162c 411 } else {
segundo 0:ac1725ba162c 412 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, releasing, restarting\n"));
segundo 0:ac1725ba162c 413 dhcp_release(netif);
segundo 0:ac1725ba162c 414 dhcp_discover(netif);
segundo 0:ac1725ba162c 415 }
segundo 0:ac1725ba162c 416 #if DHCP_DOES_ARP_CHECK
segundo 0:ac1725ba162c 417 /* received no ARP reply for the offered address (which is good) */
segundo 0:ac1725ba162c 418 } else if (dhcp->state == DHCP_CHECKING) {
segundo 0:ac1725ba162c 419 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): CHECKING, ARP request timed out\n"));
segundo 0:ac1725ba162c 420 if (dhcp->tries <= 1) {
segundo 0:ac1725ba162c 421 dhcp_check(netif);
segundo 0:ac1725ba162c 422 /* no ARP replies on the offered address,
segundo 0:ac1725ba162c 423 looks like the IP address is indeed free */
segundo 0:ac1725ba162c 424 } else {
segundo 0:ac1725ba162c 425 /* bind the interface to the offered address */
segundo 0:ac1725ba162c 426 dhcp_bind(netif);
segundo 0:ac1725ba162c 427 }
segundo 0:ac1725ba162c 428 #endif /* DHCP_DOES_ARP_CHECK */
segundo 0:ac1725ba162c 429 }
segundo 0:ac1725ba162c 430 /* did not get response to renew request? */
segundo 0:ac1725ba162c 431 else if (dhcp->state == DHCP_RENEWING) {
segundo 0:ac1725ba162c 432 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): RENEWING, DHCP request timed out\n"));
segundo 0:ac1725ba162c 433 /* just retry renewal */
segundo 0:ac1725ba162c 434 /* note that the rebind timer will eventually time-out if renew does not work */
segundo 0:ac1725ba162c 435 dhcp_renew(netif);
segundo 0:ac1725ba162c 436 /* did not get response to rebind request? */
segundo 0:ac1725ba162c 437 } else if (dhcp->state == DHCP_REBINDING) {
segundo 0:ac1725ba162c 438 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REBINDING, DHCP request timed out\n"));
segundo 0:ac1725ba162c 439 if (dhcp->tries <= 8) {
segundo 0:ac1725ba162c 440 dhcp_rebind(netif);
segundo 0:ac1725ba162c 441 } else {
segundo 0:ac1725ba162c 442 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): RELEASING, DISCOVERING\n"));
segundo 0:ac1725ba162c 443 dhcp_release(netif);
segundo 0:ac1725ba162c 444 dhcp_discover(netif);
segundo 0:ac1725ba162c 445 }
segundo 0:ac1725ba162c 446 } else if (dhcp->state == DHCP_REBOOTING) {
segundo 0:ac1725ba162c 447 if (dhcp->tries < REBOOT_TRIES) {
segundo 0:ac1725ba162c 448 dhcp_reboot(netif);
segundo 0:ac1725ba162c 449 } else {
segundo 0:ac1725ba162c 450 dhcp_discover(netif);
segundo 0:ac1725ba162c 451 }
segundo 0:ac1725ba162c 452 }
segundo 0:ac1725ba162c 453 }
segundo 0:ac1725ba162c 454
segundo 0:ac1725ba162c 455 /**
segundo 0:ac1725ba162c 456 * The renewal period has timed out.
segundo 0:ac1725ba162c 457 *
segundo 0:ac1725ba162c 458 * @param netif the netif under DHCP control
segundo 0:ac1725ba162c 459 */
segundo 0:ac1725ba162c 460 static void
segundo 0:ac1725ba162c 461 dhcp_t1_timeout(struct netif *netif)
segundo 0:ac1725ba162c 462 {
segundo 0:ac1725ba162c 463 struct dhcp *dhcp = netif->dhcp;
segundo 0:ac1725ba162c 464 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_t1_timeout()\n"));
segundo 0:ac1725ba162c 465 if ((dhcp->state == DHCP_REQUESTING) || (dhcp->state == DHCP_BOUND) ||
segundo 0:ac1725ba162c 466 (dhcp->state == DHCP_RENEWING)) {
segundo 0:ac1725ba162c 467 /* just retry to renew - note that the rebind timer (t2) will
segundo 0:ac1725ba162c 468 * eventually time-out if renew tries fail. */
segundo 0:ac1725ba162c 469 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
segundo 0:ac1725ba162c 470 ("dhcp_t1_timeout(): must renew\n"));
segundo 0:ac1725ba162c 471 /* This slightly different to RFC2131: DHCPREQUEST will be sent from state
segundo 0:ac1725ba162c 472 DHCP_RENEWING, not DHCP_BOUND */
segundo 0:ac1725ba162c 473 dhcp_renew(netif);
segundo 0:ac1725ba162c 474 }
segundo 0:ac1725ba162c 475 }
segundo 0:ac1725ba162c 476
segundo 0:ac1725ba162c 477 /**
segundo 0:ac1725ba162c 478 * The rebind period has timed out.
segundo 0:ac1725ba162c 479 *
segundo 0:ac1725ba162c 480 * @param netif the netif under DHCP control
segundo 0:ac1725ba162c 481 */
segundo 0:ac1725ba162c 482 static void
segundo 0:ac1725ba162c 483 dhcp_t2_timeout(struct netif *netif)
segundo 0:ac1725ba162c 484 {
segundo 0:ac1725ba162c 485 struct dhcp *dhcp = netif->dhcp;
segundo 0:ac1725ba162c 486 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_t2_timeout()\n"));
segundo 0:ac1725ba162c 487 if ((dhcp->state == DHCP_REQUESTING) || (dhcp->state == DHCP_BOUND) ||
segundo 0:ac1725ba162c 488 (dhcp->state == DHCP_RENEWING)) {
segundo 0:ac1725ba162c 489 /* just retry to rebind */
segundo 0:ac1725ba162c 490 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
segundo 0:ac1725ba162c 491 ("dhcp_t2_timeout(): must rebind\n"));
segundo 0:ac1725ba162c 492 /* This slightly different to RFC2131: DHCPREQUEST will be sent from state
segundo 0:ac1725ba162c 493 DHCP_REBINDING, not DHCP_BOUND */
segundo 0:ac1725ba162c 494 dhcp_rebind(netif);
segundo 0:ac1725ba162c 495 }
segundo 0:ac1725ba162c 496 }
segundo 0:ac1725ba162c 497
segundo 0:ac1725ba162c 498 /**
segundo 0:ac1725ba162c 499 * Handle a DHCP ACK packet
segundo 0:ac1725ba162c 500 *
segundo 0:ac1725ba162c 501 * @param netif the netif under DHCP control
segundo 0:ac1725ba162c 502 */
segundo 0:ac1725ba162c 503 static void
segundo 0:ac1725ba162c 504 dhcp_handle_ack(struct netif *netif)
segundo 0:ac1725ba162c 505 {
segundo 0:ac1725ba162c 506 struct dhcp *dhcp = netif->dhcp;
segundo 0:ac1725ba162c 507 #if LWIP_DNS
segundo 0:ac1725ba162c 508 u8_t n;
segundo 0:ac1725ba162c 509 #endif /* LWIP_DNS */
segundo 0:ac1725ba162c 510
segundo 0:ac1725ba162c 511 /* clear options we might not get from the ACK */
segundo 0:ac1725ba162c 512 ip_addr_set_zero(&dhcp->offered_sn_mask);
segundo 0:ac1725ba162c 513 ip_addr_set_zero(&dhcp->offered_gw_addr);
segundo 0:ac1725ba162c 514 #if LWIP_DHCP_BOOTP_FILE
segundo 0:ac1725ba162c 515 ip_addr_set_zero(&dhcp->offered_si_addr);
segundo 0:ac1725ba162c 516 #endif /* LWIP_DHCP_BOOTP_FILE */
segundo 0:ac1725ba162c 517
segundo 0:ac1725ba162c 518 /* lease time given? */
segundo 0:ac1725ba162c 519 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_LEASE_TIME)) {
segundo 0:ac1725ba162c 520 /* remember offered lease time */
segundo 0:ac1725ba162c 521 dhcp->offered_t0_lease = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_LEASE_TIME);
segundo 0:ac1725ba162c 522 }
segundo 0:ac1725ba162c 523 /* renewal period given? */
segundo 0:ac1725ba162c 524 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T1)) {
segundo 0:ac1725ba162c 525 /* remember given renewal period */
segundo 0:ac1725ba162c 526 dhcp->offered_t1_renew = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T1);
segundo 0:ac1725ba162c 527 } else {
segundo 0:ac1725ba162c 528 /* calculate safe periods for renewal */
segundo 0:ac1725ba162c 529 dhcp->offered_t1_renew = dhcp->offered_t0_lease / 2;
segundo 0:ac1725ba162c 530 }
segundo 0:ac1725ba162c 531
segundo 0:ac1725ba162c 532 /* renewal period given? */
segundo 0:ac1725ba162c 533 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T2)) {
segundo 0:ac1725ba162c 534 /* remember given rebind period */
segundo 0:ac1725ba162c 535 dhcp->offered_t2_rebind = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T2);
segundo 0:ac1725ba162c 536 } else {
segundo 0:ac1725ba162c 537 /* calculate safe periods for rebinding */
segundo 0:ac1725ba162c 538 dhcp->offered_t2_rebind = dhcp->offered_t0_lease;
segundo 0:ac1725ba162c 539 }
segundo 0:ac1725ba162c 540
segundo 0:ac1725ba162c 541 /* (y)our internet address */
segundo 0:ac1725ba162c 542 ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
segundo 0:ac1725ba162c 543
segundo 0:ac1725ba162c 544 #if LWIP_DHCP_BOOTP_FILE
segundo 0:ac1725ba162c 545 /* copy boot server address,
segundo 0:ac1725ba162c 546 boot file name copied in dhcp_parse_reply if not overloaded */
segundo 0:ac1725ba162c 547 ip_addr_copy(dhcp->offered_si_addr, dhcp->msg_in->siaddr);
segundo 0:ac1725ba162c 548 #endif /* LWIP_DHCP_BOOTP_FILE */
segundo 0:ac1725ba162c 549
segundo 0:ac1725ba162c 550 /* subnet mask given? */
segundo 0:ac1725ba162c 551 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)) {
segundo 0:ac1725ba162c 552 /* remember given subnet mask */
segundo 0:ac1725ba162c 553 ip4_addr_set_u32(&dhcp->offered_sn_mask, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)));
segundo 0:ac1725ba162c 554 dhcp->subnet_mask_given = 1;
segundo 0:ac1725ba162c 555 } else {
segundo 0:ac1725ba162c 556 dhcp->subnet_mask_given = 0;
segundo 0:ac1725ba162c 557 }
segundo 0:ac1725ba162c 558
segundo 0:ac1725ba162c 559 /* gateway router */
segundo 0:ac1725ba162c 560 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_ROUTER)) {
segundo 0:ac1725ba162c 561 ip4_addr_set_u32(&dhcp->offered_gw_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_ROUTER)));
segundo 0:ac1725ba162c 562 }
segundo 0:ac1725ba162c 563
segundo 0:ac1725ba162c 564 #if LWIP_DNS
segundo 0:ac1725ba162c 565 /* DNS servers */
segundo 0:ac1725ba162c 566 n = 0;
segundo 0:ac1725ba162c 567 while(dhcp_option_given(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n) && (n < DNS_MAX_SERVERS)) {
segundo 0:ac1725ba162c 568 ip_addr_t dns_addr;
segundo 0:ac1725ba162c 569 ip4_addr_set_u32(&dns_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n)));
segundo 0:ac1725ba162c 570 dns_setserver(n, &dns_addr);
segundo 0:ac1725ba162c 571 n++;
segundo 0:ac1725ba162c 572 }
segundo 0:ac1725ba162c 573 #endif /* LWIP_DNS */
segundo 0:ac1725ba162c 574 }
segundo 0:ac1725ba162c 575
segundo 0:ac1725ba162c 576 /** Set a statically allocated struct dhcp to work with.
segundo 0:ac1725ba162c 577 * Using this prevents dhcp_start to allocate it using mem_malloc.
segundo 0:ac1725ba162c 578 *
segundo 0:ac1725ba162c 579 * @param netif the netif for which to set the struct dhcp
segundo 0:ac1725ba162c 580 * @param dhcp (uninitialised) dhcp struct allocated by the application
segundo 0:ac1725ba162c 581 */
segundo 0:ac1725ba162c 582 void
segundo 0:ac1725ba162c 583 dhcp_set_struct(struct netif *netif, struct dhcp *dhcp)
segundo 0:ac1725ba162c 584 {
segundo 0:ac1725ba162c 585 LWIP_ASSERT("netif != NULL", netif != NULL);
segundo 0:ac1725ba162c 586 LWIP_ASSERT("dhcp != NULL", dhcp != NULL);
segundo 0:ac1725ba162c 587 LWIP_ASSERT("netif already has a struct dhcp set", netif->dhcp == NULL);
segundo 0:ac1725ba162c 588
segundo 0:ac1725ba162c 589 /* clear data structure */
segundo 0:ac1725ba162c 590 memset(dhcp, 0, sizeof(struct dhcp));
segundo 0:ac1725ba162c 591 /* dhcp_set_state(&dhcp, DHCP_OFF); */
segundo 0:ac1725ba162c 592 netif->dhcp = dhcp;
segundo 0:ac1725ba162c 593 }
segundo 0:ac1725ba162c 594
segundo 0:ac1725ba162c 595 /**
segundo 0:ac1725ba162c 596 * Start DHCP negotiation for a network interface.
segundo 0:ac1725ba162c 597 *
segundo 0:ac1725ba162c 598 * If no DHCP client instance was attached to this interface,
segundo 0:ac1725ba162c 599 * a new client is created first. If a DHCP client instance
segundo 0:ac1725ba162c 600 * was already present, it restarts negotiation.
segundo 0:ac1725ba162c 601 *
segundo 0:ac1725ba162c 602 * @param netif The lwIP network interface
segundo 0:ac1725ba162c 603 * @return lwIP error code
segundo 0:ac1725ba162c 604 * - ERR_OK - No error
segundo 0:ac1725ba162c 605 * - ERR_MEM - Out of memory
segundo 0:ac1725ba162c 606 */
segundo 0:ac1725ba162c 607 err_t
segundo 0:ac1725ba162c 608 dhcp_start(struct netif *netif)
segundo 0:ac1725ba162c 609 {
segundo 0:ac1725ba162c 610 struct dhcp *dhcp;
segundo 0:ac1725ba162c 611 err_t result = ERR_OK;
segundo 0:ac1725ba162c 612
segundo 0:ac1725ba162c 613 LWIP_ERROR("netif != NULL", (netif != NULL), return ERR_ARG;);
segundo 0:ac1725ba162c 614 dhcp = netif->dhcp;
segundo 0:ac1725ba162c 615 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));
segundo 0:ac1725ba162c 616 /* Remove the flag that says this netif is handled by DHCP,
segundo 0:ac1725ba162c 617 it is set when we succeeded starting. */
segundo 0:ac1725ba162c 618 netif->flags &= ~NETIF_FLAG_DHCP;
segundo 0:ac1725ba162c 619
segundo 0:ac1725ba162c 620 /* check hwtype of the netif */
segundo 0:ac1725ba162c 621 if ((netif->flags & NETIF_FLAG_ETHARP) == 0) {
segundo 0:ac1725ba162c 622 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): No ETHARP netif\n"));
segundo 0:ac1725ba162c 623 return ERR_ARG;
segundo 0:ac1725ba162c 624 }
segundo 0:ac1725ba162c 625
segundo 0:ac1725ba162c 626 /* check MTU of the netif */
segundo 0:ac1725ba162c 627 if (netif->mtu < DHCP_MAX_MSG_LEN_MIN_REQUIRED) {
segundo 0:ac1725ba162c 628 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): Cannot use this netif with DHCP: MTU is too small\n"));
segundo 0:ac1725ba162c 629 return ERR_MEM;
segundo 0:ac1725ba162c 630 }
segundo 0:ac1725ba162c 631
segundo 0:ac1725ba162c 632 /* no DHCP client attached yet? */
segundo 0:ac1725ba162c 633 if (dhcp == NULL) {
segundo 0:ac1725ba162c 634 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): starting new DHCP client\n"));
segundo 0:ac1725ba162c 635 dhcp = (struct dhcp *)mem_malloc(sizeof(struct dhcp));
segundo 0:ac1725ba162c 636 if (dhcp == NULL) {
segundo 0:ac1725ba162c 637 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): could not allocate dhcp\n"));
segundo 0:ac1725ba162c 638 return ERR_MEM;
segundo 0:ac1725ba162c 639 }
segundo 0:ac1725ba162c 640 /* store this dhcp client in the netif */
segundo 0:ac1725ba162c 641 netif->dhcp = dhcp;
segundo 0:ac1725ba162c 642 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): allocated dhcp"));
segundo 0:ac1725ba162c 643 /* already has DHCP client attached */
segundo 0:ac1725ba162c 644 } else {
segundo 0:ac1725ba162c 645 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_start(): restarting DHCP configuration\n"));
segundo 0:ac1725ba162c 646 if (dhcp->pcb != NULL) {
segundo 0:ac1725ba162c 647 udp_remove(dhcp->pcb);
segundo 0:ac1725ba162c 648 }
segundo 0:ac1725ba162c 649 LWIP_ASSERT("pbuf p_out wasn't freed", dhcp->p_out == NULL);
segundo 0:ac1725ba162c 650 LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL );
segundo 0:ac1725ba162c 651 }
segundo 0:ac1725ba162c 652
segundo 0:ac1725ba162c 653 /* clear data structure */
segundo 0:ac1725ba162c 654 memset(dhcp, 0, sizeof(struct dhcp));
segundo 0:ac1725ba162c 655 /* dhcp_set_state(&dhcp, DHCP_OFF); */
segundo 0:ac1725ba162c 656 /* allocate UDP PCB */
segundo 0:ac1725ba162c 657 dhcp->pcb = udp_new();
segundo 0:ac1725ba162c 658 if (dhcp->pcb == NULL) {
segundo 0:ac1725ba162c 659 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): could not obtain pcb\n"));
segundo 0:ac1725ba162c 660 return ERR_MEM;
segundo 0:ac1725ba162c 661 }
segundo 0:ac1725ba162c 662 dhcp->pcb->so_options |= SOF_BROADCAST;
segundo 0:ac1725ba162c 663 /* set up local and remote port for the pcb */
segundo 0:ac1725ba162c 664 udp_bind(dhcp->pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
segundo 0:ac1725ba162c 665 udp_connect(dhcp->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
segundo 0:ac1725ba162c 666 /* set up the recv callback and argument */
segundo 0:ac1725ba162c 667 udp_recv(dhcp->pcb, dhcp_recv, netif);
segundo 0:ac1725ba162c 668 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): starting DHCP configuration\n"));
segundo 0:ac1725ba162c 669 /* (re)start the DHCP negotiation */
segundo 0:ac1725ba162c 670 result = dhcp_discover(netif);
segundo 0:ac1725ba162c 671 if (result != ERR_OK) {
segundo 0:ac1725ba162c 672 /* free resources allocated above */
segundo 0:ac1725ba162c 673 dhcp_stop(netif);
segundo 0:ac1725ba162c 674 return ERR_MEM;
segundo 0:ac1725ba162c 675 }
segundo 0:ac1725ba162c 676 /* Set the flag that says this netif is handled by DHCP. */
segundo 0:ac1725ba162c 677 netif->flags |= NETIF_FLAG_DHCP;
segundo 0:ac1725ba162c 678 return result;
segundo 0:ac1725ba162c 679 }
segundo 0:ac1725ba162c 680
segundo 0:ac1725ba162c 681 /**
segundo 0:ac1725ba162c 682 * Inform a DHCP server of our manual configuration.
segundo 0:ac1725ba162c 683 *
segundo 0:ac1725ba162c 684 * This informs DHCP servers of our fixed IP address configuration
segundo 0:ac1725ba162c 685 * by sending an INFORM message. It does not involve DHCP address
segundo 0:ac1725ba162c 686 * configuration, it is just here to be nice to the network.
segundo 0:ac1725ba162c 687 *
segundo 0:ac1725ba162c 688 * @param netif The lwIP network interface
segundo 0:ac1725ba162c 689 */
segundo 0:ac1725ba162c 690 void
segundo 0:ac1725ba162c 691 dhcp_inform(struct netif *netif)
segundo 0:ac1725ba162c 692 {
segundo 0:ac1725ba162c 693 struct dhcp dhcp;
segundo 0:ac1725ba162c 694 err_t result = ERR_OK;
segundo 0:ac1725ba162c 695 struct udp_pcb *pcb;
segundo 0:ac1725ba162c 696
segundo 0:ac1725ba162c 697 LWIP_ERROR("netif != NULL", (netif != NULL), return;);
segundo 0:ac1725ba162c 698
segundo 0:ac1725ba162c 699 memset(&dhcp, 0, sizeof(struct dhcp));
segundo 0:ac1725ba162c 700 dhcp_set_state(&dhcp, DHCP_INFORM);
segundo 0:ac1725ba162c 701
segundo 0:ac1725ba162c 702 if ((netif->dhcp != NULL) && (netif->dhcp->pcb != NULL)) {
segundo 0:ac1725ba162c 703 /* re-use existing pcb */
segundo 0:ac1725ba162c 704 pcb = netif->dhcp->pcb;
segundo 0:ac1725ba162c 705 } else {
segundo 0:ac1725ba162c 706 pcb = udp_new();
segundo 0:ac1725ba162c 707 if (pcb == NULL) {
segundo 0:ac1725ba162c 708 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform(): could not obtain pcb"));
segundo 0:ac1725ba162c 709 return;
segundo 0:ac1725ba162c 710 }
segundo 0:ac1725ba162c 711 dhcp.pcb = pcb;
segundo 0:ac1725ba162c 712 dhcp.pcb->so_options |= SOF_BROADCAST;
segundo 0:ac1725ba162c 713 udp_bind(dhcp.pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
segundo 0:ac1725ba162c 714 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_inform(): created new udp pcb\n"));
segundo 0:ac1725ba162c 715 }
segundo 0:ac1725ba162c 716 /* create and initialize the DHCP message header */
segundo 0:ac1725ba162c 717 result = dhcp_create_msg(netif, &dhcp, DHCP_INFORM);
segundo 0:ac1725ba162c 718 if (result == ERR_OK) {
segundo 0:ac1725ba162c 719 dhcp_option(&dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
segundo 0:ac1725ba162c 720 dhcp_option_short(&dhcp, DHCP_MAX_MSG_LEN(netif));
segundo 0:ac1725ba162c 721
segundo 0:ac1725ba162c 722 dhcp_option_trailer(&dhcp);
segundo 0:ac1725ba162c 723
segundo 0:ac1725ba162c 724 pbuf_realloc(dhcp.p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp.options_out_len);
segundo 0:ac1725ba162c 725
segundo 0:ac1725ba162c 726 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_inform: INFORMING\n"));
segundo 0:ac1725ba162c 727 udp_sendto_if(pcb, dhcp.p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
segundo 0:ac1725ba162c 728 dhcp_delete_msg(&dhcp);
segundo 0:ac1725ba162c 729 } else {
segundo 0:ac1725ba162c 730 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform: could not allocate DHCP request\n"));
segundo 0:ac1725ba162c 731 }
segundo 0:ac1725ba162c 732
segundo 0:ac1725ba162c 733 if (dhcp.pcb != NULL) {
segundo 0:ac1725ba162c 734 /* otherwise, the existing pcb was used */
segundo 0:ac1725ba162c 735 udp_remove(dhcp.pcb);
segundo 0:ac1725ba162c 736 }
segundo 0:ac1725ba162c 737 }
segundo 0:ac1725ba162c 738
segundo 0:ac1725ba162c 739 /** Handle a possible change in the network configuration.
segundo 0:ac1725ba162c 740 *
segundo 0:ac1725ba162c 741 * This enters the REBOOTING state to verify that the currently bound
segundo 0:ac1725ba162c 742 * address is still valid.
segundo 0:ac1725ba162c 743 */
segundo 0:ac1725ba162c 744 void
segundo 0:ac1725ba162c 745 dhcp_network_changed(struct netif *netif)
segundo 0:ac1725ba162c 746 {
segundo 0:ac1725ba162c 747 struct dhcp *dhcp = netif->dhcp;
segundo 0:ac1725ba162c 748 if (!dhcp)
segundo 0:ac1725ba162c 749 return;
segundo 0:ac1725ba162c 750 switch (dhcp->state) {
segundo 0:ac1725ba162c 751 case DHCP_REBINDING:
segundo 0:ac1725ba162c 752 case DHCP_RENEWING:
segundo 0:ac1725ba162c 753 case DHCP_BOUND:
segundo 0:ac1725ba162c 754 case DHCP_REBOOTING:
segundo 0:ac1725ba162c 755 netif_set_down(netif);
segundo 0:ac1725ba162c 756 dhcp->tries = 0;
segundo 0:ac1725ba162c 757 dhcp_reboot(netif);
segundo 0:ac1725ba162c 758 break;
segundo 0:ac1725ba162c 759 case DHCP_OFF:
segundo 0:ac1725ba162c 760 /* stay off */
segundo 0:ac1725ba162c 761 break;
segundo 0:ac1725ba162c 762 default:
segundo 0:ac1725ba162c 763 dhcp->tries = 0;
segundo 0:ac1725ba162c 764 #if LWIP_DHCP_AUTOIP_COOP
segundo 0:ac1725ba162c 765 dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
segundo 0:ac1725ba162c 766 #endif /* LWIP_DHCP_AUTOIP_COOP */
segundo 0:ac1725ba162c 767 dhcp_discover(netif);
segundo 0:ac1725ba162c 768 break;
segundo 0:ac1725ba162c 769 }
segundo 0:ac1725ba162c 770 }
segundo 0:ac1725ba162c 771
segundo 0:ac1725ba162c 772 #if DHCP_DOES_ARP_CHECK
segundo 0:ac1725ba162c 773 /**
segundo 0:ac1725ba162c 774 * Match an ARP reply with the offered IP address.
segundo 0:ac1725ba162c 775 *
segundo 0:ac1725ba162c 776 * @param netif the network interface on which the reply was received
segundo 0:ac1725ba162c 777 * @param addr The IP address we received a reply from
segundo 0:ac1725ba162c 778 */
segundo 0:ac1725ba162c 779 void dhcp_arp_reply(struct netif *netif, ip_addr_t *addr)
segundo 0:ac1725ba162c 780 {
segundo 0:ac1725ba162c 781 LWIP_ERROR("netif != NULL", (netif != NULL), return;);
segundo 0:ac1725ba162c 782 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_arp_reply()\n"));
segundo 0:ac1725ba162c 783 /* is a DHCP client doing an ARP check? */
segundo 0:ac1725ba162c 784 if ((netif->dhcp != NULL) && (netif->dhcp->state == DHCP_CHECKING)) {
segundo 0:ac1725ba162c 785 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_arp_reply(): CHECKING, arp reply for 0x%08"X32_F"\n",
segundo 0:ac1725ba162c 786 ip4_addr_get_u32(addr)));
segundo 0:ac1725ba162c 787 /* did a host respond with the address we
segundo 0:ac1725ba162c 788 were offered by the DHCP server? */
segundo 0:ac1725ba162c 789 if (ip_addr_cmp(addr, &netif->dhcp->offered_ip_addr)) {
segundo 0:ac1725ba162c 790 /* we will not accept the offered address */
segundo 0:ac1725ba162c 791 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING,
segundo 0:ac1725ba162c 792 ("dhcp_arp_reply(): arp reply matched with offered address, declining\n"));
segundo 0:ac1725ba162c 793 dhcp_decline(netif);
segundo 0:ac1725ba162c 794 }
segundo 0:ac1725ba162c 795 }
segundo 0:ac1725ba162c 796 }
segundo 0:ac1725ba162c 797
segundo 0:ac1725ba162c 798 /**
segundo 0:ac1725ba162c 799 * Decline an offered lease.
segundo 0:ac1725ba162c 800 *
segundo 0:ac1725ba162c 801 * Tell the DHCP server we do not accept the offered address.
segundo 0:ac1725ba162c 802 * One reason to decline the lease is when we find out the address
segundo 0:ac1725ba162c 803 * is already in use by another host (through ARP).
segundo 0:ac1725ba162c 804 *
segundo 0:ac1725ba162c 805 * @param netif the netif under DHCP control
segundo 0:ac1725ba162c 806 */
segundo 0:ac1725ba162c 807 static err_t
segundo 0:ac1725ba162c 808 dhcp_decline(struct netif *netif)
segundo 0:ac1725ba162c 809 {
segundo 0:ac1725ba162c 810 struct dhcp *dhcp = netif->dhcp;
segundo 0:ac1725ba162c 811 err_t result = ERR_OK;
segundo 0:ac1725ba162c 812 u16_t msecs;
segundo 0:ac1725ba162c 813 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_decline()\n"));
segundo 0:ac1725ba162c 814 dhcp_set_state(dhcp, DHCP_BACKING_OFF);
segundo 0:ac1725ba162c 815 /* create and initialize the DHCP message header */
segundo 0:ac1725ba162c 816 result = dhcp_create_msg(netif, dhcp, DHCP_DECLINE);
segundo 0:ac1725ba162c 817 if (result == ERR_OK) {
segundo 0:ac1725ba162c 818 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
segundo 0:ac1725ba162c 819 dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
segundo 0:ac1725ba162c 820
segundo 0:ac1725ba162c 821 dhcp_option_trailer(dhcp);
segundo 0:ac1725ba162c 822 /* resize pbuf to reflect true size of options */
segundo 0:ac1725ba162c 823 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
segundo 0:ac1725ba162c 824
segundo 0:ac1725ba162c 825 /* per section 4.4.4, broadcast DECLINE messages */
segundo 0:ac1725ba162c 826 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
segundo 0:ac1725ba162c 827 dhcp_delete_msg(dhcp);
segundo 0:ac1725ba162c 828 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_decline: BACKING OFF\n"));
segundo 0:ac1725ba162c 829 } else {
segundo 0:ac1725ba162c 830 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
segundo 0:ac1725ba162c 831 ("dhcp_decline: could not allocate DHCP request\n"));
segundo 0:ac1725ba162c 832 }
segundo 0:ac1725ba162c 833 dhcp->tries++;
segundo 0:ac1725ba162c 834 msecs = 10*1000;
segundo 0:ac1725ba162c 835 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
segundo 0:ac1725ba162c 836 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_decline(): set request timeout %"U16_F" msecs\n", msecs));
segundo 0:ac1725ba162c 837 return result;
segundo 0:ac1725ba162c 838 }
segundo 0:ac1725ba162c 839 #endif /* DHCP_DOES_ARP_CHECK */
segundo 0:ac1725ba162c 840
segundo 0:ac1725ba162c 841
segundo 0:ac1725ba162c 842 /**
segundo 0:ac1725ba162c 843 * Start the DHCP process, discover a DHCP server.
segundo 0:ac1725ba162c 844 *
segundo 0:ac1725ba162c 845 * @param netif the netif under DHCP control
segundo 0:ac1725ba162c 846 */
segundo 0:ac1725ba162c 847 static err_t
segundo 0:ac1725ba162c 848 dhcp_discover(struct netif *netif)
segundo 0:ac1725ba162c 849 {
segundo 0:ac1725ba162c 850 struct dhcp *dhcp = netif->dhcp;
segundo 0:ac1725ba162c 851 err_t result = ERR_OK;
segundo 0:ac1725ba162c 852 u16_t msecs;
segundo 0:ac1725ba162c 853 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover()\n"));
segundo 0:ac1725ba162c 854 ip_addr_set_any(&dhcp->offered_ip_addr);
segundo 0:ac1725ba162c 855 dhcp_set_state(dhcp, DHCP_SELECTING);
segundo 0:ac1725ba162c 856 /* create and initialize the DHCP message header */
segundo 0:ac1725ba162c 857 result = dhcp_create_msg(netif, dhcp, DHCP_DISCOVER);
segundo 0:ac1725ba162c 858 if (result == ERR_OK) {
segundo 0:ac1725ba162c 859 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: making request\n"));
segundo 0:ac1725ba162c 860
segundo 0:ac1725ba162c 861 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
segundo 0:ac1725ba162c 862 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
segundo 0:ac1725ba162c 863
segundo 0:ac1725ba162c 864 dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);
segundo 0:ac1725ba162c 865 dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
segundo 0:ac1725ba162c 866 dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
segundo 0:ac1725ba162c 867 dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
segundo 0:ac1725ba162c 868 dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
segundo 0:ac1725ba162c 869
segundo 0:ac1725ba162c 870 dhcp_option_trailer(dhcp);
segundo 0:ac1725ba162c 871
segundo 0:ac1725ba162c 872 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: realloc()ing\n"));
segundo 0:ac1725ba162c 873 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
segundo 0:ac1725ba162c 874
segundo 0:ac1725ba162c 875 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: sendto(DISCOVER, IP_ADDR_BROADCAST, DHCP_SERVER_PORT)\n"));
segundo 0:ac1725ba162c 876 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
segundo 0:ac1725ba162c 877 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: deleting()ing\n"));
segundo 0:ac1725ba162c 878 dhcp_delete_msg(dhcp);
segundo 0:ac1725ba162c 879 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_discover: SELECTING\n"));
segundo 0:ac1725ba162c 880 } else {
segundo 0:ac1725ba162c 881 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_discover: could not allocate DHCP request\n"));
segundo 0:ac1725ba162c 882 }
segundo 0:ac1725ba162c 883 dhcp->tries++;
segundo 0:ac1725ba162c 884 #if LWIP_DHCP_AUTOIP_COOP
segundo 0:ac1725ba162c 885 if(dhcp->tries >= LWIP_DHCP_AUTOIP_COOP_TRIES && dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_OFF) {
segundo 0:ac1725ba162c 886 dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_ON;
segundo 0:ac1725ba162c 887 autoip_start(netif);
segundo 0:ac1725ba162c 888 }
segundo 0:ac1725ba162c 889 #endif /* LWIP_DHCP_AUTOIP_COOP */
segundo 0:ac1725ba162c 890 msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
segundo 0:ac1725ba162c 891 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
segundo 0:ac1725ba162c 892 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_discover(): set request timeout %"U16_F" msecs\n", msecs));
segundo 0:ac1725ba162c 893 return result;
segundo 0:ac1725ba162c 894 }
segundo 0:ac1725ba162c 895
segundo 0:ac1725ba162c 896
segundo 0:ac1725ba162c 897 /**
segundo 0:ac1725ba162c 898 * Bind the interface to the offered IP address.
segundo 0:ac1725ba162c 899 *
segundo 0:ac1725ba162c 900 * @param netif network interface to bind to the offered address
segundo 0:ac1725ba162c 901 */
segundo 0:ac1725ba162c 902 static void
segundo 0:ac1725ba162c 903 dhcp_bind(struct netif *netif)
segundo 0:ac1725ba162c 904 {
segundo 0:ac1725ba162c 905 u32_t timeout;
segundo 0:ac1725ba162c 906 struct dhcp *dhcp;
segundo 0:ac1725ba162c 907 ip_addr_t sn_mask, gw_addr;
segundo 0:ac1725ba162c 908 LWIP_ERROR("dhcp_bind: netif != NULL", (netif != NULL), return;);
segundo 0:ac1725ba162c 909 dhcp = netif->dhcp;
segundo 0:ac1725ba162c 910 LWIP_ERROR("dhcp_bind: dhcp != NULL", (dhcp != NULL), return;);
segundo 0:ac1725ba162c 911 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));
segundo 0:ac1725ba162c 912
segundo 0:ac1725ba162c 913 /* temporary DHCP lease? */
segundo 0:ac1725ba162c 914 if (dhcp->offered_t1_renew != 0xffffffffUL) {
segundo 0:ac1725ba162c 915 /* set renewal period timer */
segundo 0:ac1725ba162c 916 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(): t1 renewal timer %"U32_F" secs\n", dhcp->offered_t1_renew));
segundo 0:ac1725ba162c 917 timeout = (dhcp->offered_t1_renew + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
segundo 0:ac1725ba162c 918 if(timeout > 0xffff) {
segundo 0:ac1725ba162c 919 timeout = 0xffff;
segundo 0:ac1725ba162c 920 }
segundo 0:ac1725ba162c 921 dhcp->t1_timeout = (u16_t)timeout;
segundo 0:ac1725ba162c 922 if (dhcp->t1_timeout == 0) {
segundo 0:ac1725ba162c 923 dhcp->t1_timeout = 1;
segundo 0:ac1725ba162c 924 }
segundo 0:ac1725ba162c 925 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_bind(): set request timeout %"U32_F" msecs\n", dhcp->offered_t1_renew*1000));
segundo 0:ac1725ba162c 926 }
segundo 0:ac1725ba162c 927 /* set renewal period timer */
segundo 0:ac1725ba162c 928 if (dhcp->offered_t2_rebind != 0xffffffffUL) {
segundo 0:ac1725ba162c 929 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(): t2 rebind timer %"U32_F" secs\n", dhcp->offered_t2_rebind));
segundo 0:ac1725ba162c 930 timeout = (dhcp->offered_t2_rebind + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
segundo 0:ac1725ba162c 931 if(timeout > 0xffff) {
segundo 0:ac1725ba162c 932 timeout = 0xffff;
segundo 0:ac1725ba162c 933 }
segundo 0:ac1725ba162c 934 dhcp->t2_timeout = (u16_t)timeout;
segundo 0:ac1725ba162c 935 if (dhcp->t2_timeout == 0) {
segundo 0:ac1725ba162c 936 dhcp->t2_timeout = 1;
segundo 0:ac1725ba162c 937 }
segundo 0:ac1725ba162c 938 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_bind(): set request timeout %"U32_F" msecs\n", dhcp->offered_t2_rebind*1000));
segundo 0:ac1725ba162c 939 }
segundo 0:ac1725ba162c 940
segundo 0:ac1725ba162c 941 if (dhcp->subnet_mask_given) {
segundo 0:ac1725ba162c 942 /* copy offered network mask */
segundo 0:ac1725ba162c 943 ip_addr_copy(sn_mask, dhcp->offered_sn_mask);
segundo 0:ac1725ba162c 944 } else {
segundo 0:ac1725ba162c 945 /* subnet mask not given, choose a safe subnet mask given the network class */
segundo 0:ac1725ba162c 946 u8_t first_octet = ip4_addr1(&dhcp->offered_ip_addr);
segundo 0:ac1725ba162c 947 if (first_octet <= 127) {
segundo 0:ac1725ba162c 948 ip4_addr_set_u32(&sn_mask, PP_HTONL(0xff000000));
segundo 0:ac1725ba162c 949 } else if (first_octet >= 192) {
segundo 0:ac1725ba162c 950 ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffffff00));
segundo 0:ac1725ba162c 951 } else {
segundo 0:ac1725ba162c 952 ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffff0000));
segundo 0:ac1725ba162c 953 }
segundo 0:ac1725ba162c 954 }
segundo 0:ac1725ba162c 955
segundo 0:ac1725ba162c 956 ip_addr_copy(gw_addr, dhcp->offered_gw_addr);
segundo 0:ac1725ba162c 957 /* gateway address not given? */
segundo 0:ac1725ba162c 958 if (ip_addr_isany(&gw_addr)) {
segundo 0:ac1725ba162c 959 /* copy network address */
segundo 0:ac1725ba162c 960 ip_addr_get_network(&gw_addr, &dhcp->offered_ip_addr, &sn_mask);
segundo 0:ac1725ba162c 961 /* use first host address on network as gateway */
segundo 0:ac1725ba162c 962 ip4_addr_set_u32(&gw_addr, ip4_addr_get_u32(&gw_addr) | PP_HTONL(0x00000001));
segundo 0:ac1725ba162c 963 }
segundo 0:ac1725ba162c 964
segundo 0:ac1725ba162c 965 #if LWIP_DHCP_AUTOIP_COOP
segundo 0:ac1725ba162c 966 if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
segundo 0:ac1725ba162c 967 autoip_stop(netif);
segundo 0:ac1725ba162c 968 dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
segundo 0:ac1725ba162c 969 }
segundo 0:ac1725ba162c 970 #endif /* LWIP_DHCP_AUTOIP_COOP */
segundo 0:ac1725ba162c 971
segundo 0:ac1725ba162c 972 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): IP: 0x%08"X32_F"\n",
segundo 0:ac1725ba162c 973 ip4_addr_get_u32(&dhcp->offered_ip_addr)));
segundo 0:ac1725ba162c 974 netif_set_ipaddr(netif, &dhcp->offered_ip_addr);
segundo 0:ac1725ba162c 975 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): SN: 0x%08"X32_F"\n",
segundo 0:ac1725ba162c 976 ip4_addr_get_u32(&sn_mask)));
segundo 0:ac1725ba162c 977 netif_set_netmask(netif, &sn_mask);
segundo 0:ac1725ba162c 978 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): GW: 0x%08"X32_F"\n",
segundo 0:ac1725ba162c 979 ip4_addr_get_u32(&gw_addr)));
segundo 0:ac1725ba162c 980 netif_set_gw(netif, &gw_addr);
segundo 0:ac1725ba162c 981 /* bring the interface up */
segundo 0:ac1725ba162c 982 netif_set_up(netif);
segundo 0:ac1725ba162c 983 /* netif is now bound to DHCP leased address */
segundo 0:ac1725ba162c 984 dhcp_set_state(dhcp, DHCP_BOUND);
segundo 0:ac1725ba162c 985 }
segundo 0:ac1725ba162c 986
segundo 0:ac1725ba162c 987 /**
segundo 0:ac1725ba162c 988 * Renew an existing DHCP lease at the involved DHCP server.
segundo 0:ac1725ba162c 989 *
segundo 0:ac1725ba162c 990 * @param netif network interface which must renew its lease
segundo 0:ac1725ba162c 991 */
segundo 0:ac1725ba162c 992 err_t
segundo 0:ac1725ba162c 993 dhcp_renew(struct netif *netif)
segundo 0:ac1725ba162c 994 {
segundo 0:ac1725ba162c 995 struct dhcp *dhcp = netif->dhcp;
segundo 0:ac1725ba162c 996 err_t result;
segundo 0:ac1725ba162c 997 u16_t msecs;
segundo 0:ac1725ba162c 998 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_renew()\n"));
segundo 0:ac1725ba162c 999 dhcp_set_state(dhcp, DHCP_RENEWING);
segundo 0:ac1725ba162c 1000
segundo 0:ac1725ba162c 1001 /* create and initialize the DHCP message header */
segundo 0:ac1725ba162c 1002 result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
segundo 0:ac1725ba162c 1003 if (result == ERR_OK) {
segundo 0:ac1725ba162c 1004 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
segundo 0:ac1725ba162c 1005 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
segundo 0:ac1725ba162c 1006
segundo 0:ac1725ba162c 1007 #if LWIP_NETIF_HOSTNAME
segundo 0:ac1725ba162c 1008 if (netif->hostname != NULL) {
segundo 0:ac1725ba162c 1009 const char *p = (const char*)netif->hostname;
segundo 0:ac1725ba162c 1010 u8_t namelen = (u8_t)strlen(p);
segundo 0:ac1725ba162c 1011 if (namelen > 0) {
segundo 0:ac1725ba162c 1012 LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
segundo 0:ac1725ba162c 1013 dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
segundo 0:ac1725ba162c 1014 while (*p) {
segundo 0:ac1725ba162c 1015 dhcp_option_byte(dhcp, *p++);
segundo 0:ac1725ba162c 1016 }
segundo 0:ac1725ba162c 1017 }
segundo 0:ac1725ba162c 1018 }
segundo 0:ac1725ba162c 1019 #endif /* LWIP_NETIF_HOSTNAME */
segundo 0:ac1725ba162c 1020
segundo 0:ac1725ba162c 1021 #if 0
segundo 0:ac1725ba162c 1022 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
segundo 0:ac1725ba162c 1023 dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
segundo 0:ac1725ba162c 1024 #endif
segundo 0:ac1725ba162c 1025
segundo 0:ac1725ba162c 1026 #if 0
segundo 0:ac1725ba162c 1027 dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
segundo 0:ac1725ba162c 1028 dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
segundo 0:ac1725ba162c 1029 #endif
segundo 0:ac1725ba162c 1030 /* append DHCP message trailer */
segundo 0:ac1725ba162c 1031 dhcp_option_trailer(dhcp);
segundo 0:ac1725ba162c 1032
segundo 0:ac1725ba162c 1033 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
segundo 0:ac1725ba162c 1034
segundo 0:ac1725ba162c 1035 udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
segundo 0:ac1725ba162c 1036 dhcp_delete_msg(dhcp);
segundo 0:ac1725ba162c 1037
segundo 0:ac1725ba162c 1038 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_renew: RENEWING\n"));
segundo 0:ac1725ba162c 1039 } else {
segundo 0:ac1725ba162c 1040 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_renew: could not allocate DHCP request\n"));
segundo 0:ac1725ba162c 1041 }
segundo 0:ac1725ba162c 1042 dhcp->tries++;
segundo 0:ac1725ba162c 1043 /* back-off on retries, but to a maximum of 20 seconds */
segundo 0:ac1725ba162c 1044 msecs = dhcp->tries < 10 ? dhcp->tries * 2000 : 20 * 1000;
segundo 0:ac1725ba162c 1045 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
segundo 0:ac1725ba162c 1046 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_renew(): set request timeout %"U16_F" msecs\n", msecs));
segundo 0:ac1725ba162c 1047 return result;
segundo 0:ac1725ba162c 1048 }
segundo 0:ac1725ba162c 1049
segundo 0:ac1725ba162c 1050 /**
segundo 0:ac1725ba162c 1051 * Rebind with a DHCP server for an existing DHCP lease.
segundo 0:ac1725ba162c 1052 *
segundo 0:ac1725ba162c 1053 * @param netif network interface which must rebind with a DHCP server
segundo 0:ac1725ba162c 1054 */
segundo 0:ac1725ba162c 1055 static err_t
segundo 0:ac1725ba162c 1056 dhcp_rebind(struct netif *netif)
segundo 0:ac1725ba162c 1057 {
segundo 0:ac1725ba162c 1058 struct dhcp *dhcp = netif->dhcp;
segundo 0:ac1725ba162c 1059 err_t result;
segundo 0:ac1725ba162c 1060 u16_t msecs;
segundo 0:ac1725ba162c 1061 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind()\n"));
segundo 0:ac1725ba162c 1062 dhcp_set_state(dhcp, DHCP_REBINDING);
segundo 0:ac1725ba162c 1063
segundo 0:ac1725ba162c 1064 /* create and initialize the DHCP message header */
segundo 0:ac1725ba162c 1065 result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
segundo 0:ac1725ba162c 1066 if (result == ERR_OK) {
segundo 0:ac1725ba162c 1067 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
segundo 0:ac1725ba162c 1068 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
segundo 0:ac1725ba162c 1069
segundo 0:ac1725ba162c 1070 #if LWIP_NETIF_HOSTNAME
segundo 0:ac1725ba162c 1071 if (netif->hostname != NULL) {
segundo 0:ac1725ba162c 1072 const char *p = (const char*)netif->hostname;
segundo 0:ac1725ba162c 1073 u8_t namelen = (u8_t)strlen(p);
segundo 0:ac1725ba162c 1074 if (namelen > 0) {
segundo 0:ac1725ba162c 1075 LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
segundo 0:ac1725ba162c 1076 dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
segundo 0:ac1725ba162c 1077 while (*p) {
segundo 0:ac1725ba162c 1078 dhcp_option_byte(dhcp, *p++);
segundo 0:ac1725ba162c 1079 }
segundo 0:ac1725ba162c 1080 }
segundo 0:ac1725ba162c 1081 }
segundo 0:ac1725ba162c 1082 #endif /* LWIP_NETIF_HOSTNAME */
segundo 0:ac1725ba162c 1083
segundo 0:ac1725ba162c 1084 #if 0
segundo 0:ac1725ba162c 1085 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
segundo 0:ac1725ba162c 1086 dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
segundo 0:ac1725ba162c 1087
segundo 0:ac1725ba162c 1088 dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
segundo 0:ac1725ba162c 1089 dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
segundo 0:ac1725ba162c 1090 #endif
segundo 0:ac1725ba162c 1091
segundo 0:ac1725ba162c 1092 dhcp_option_trailer(dhcp);
segundo 0:ac1725ba162c 1093
segundo 0:ac1725ba162c 1094 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
segundo 0:ac1725ba162c 1095
segundo 0:ac1725ba162c 1096 /* broadcast to server */
segundo 0:ac1725ba162c 1097 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
segundo 0:ac1725ba162c 1098 dhcp_delete_msg(dhcp);
segundo 0:ac1725ba162c 1099 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind: REBINDING\n"));
segundo 0:ac1725ba162c 1100 } else {
segundo 0:ac1725ba162c 1101 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_rebind: could not allocate DHCP request\n"));
segundo 0:ac1725ba162c 1102 }
segundo 0:ac1725ba162c 1103 dhcp->tries++;
segundo 0:ac1725ba162c 1104 msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
segundo 0:ac1725ba162c 1105 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
segundo 0:ac1725ba162c 1106 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind(): set request timeout %"U16_F" msecs\n", msecs));
segundo 0:ac1725ba162c 1107 return result;
segundo 0:ac1725ba162c 1108 }
segundo 0:ac1725ba162c 1109
segundo 0:ac1725ba162c 1110 /**
segundo 0:ac1725ba162c 1111 * Enter REBOOTING state to verify an existing lease
segundo 0:ac1725ba162c 1112 *
segundo 0:ac1725ba162c 1113 * @param netif network interface which must reboot
segundo 0:ac1725ba162c 1114 */
segundo 0:ac1725ba162c 1115 static err_t
segundo 0:ac1725ba162c 1116 dhcp_reboot(struct netif *netif)
segundo 0:ac1725ba162c 1117 {
segundo 0:ac1725ba162c 1118 struct dhcp *dhcp = netif->dhcp;
segundo 0:ac1725ba162c 1119 err_t result;
segundo 0:ac1725ba162c 1120 u16_t msecs;
segundo 0:ac1725ba162c 1121 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot()\n"));
segundo 0:ac1725ba162c 1122 dhcp_set_state(dhcp, DHCP_REBOOTING);
segundo 0:ac1725ba162c 1123
segundo 0:ac1725ba162c 1124 /* create and initialize the DHCP message header */
segundo 0:ac1725ba162c 1125 result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
segundo 0:ac1725ba162c 1126 if (result == ERR_OK) {
segundo 0:ac1725ba162c 1127 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
segundo 0:ac1725ba162c 1128 dhcp_option_short(dhcp, 576);
segundo 0:ac1725ba162c 1129
segundo 0:ac1725ba162c 1130 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
segundo 0:ac1725ba162c 1131 dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
segundo 0:ac1725ba162c 1132
segundo 0:ac1725ba162c 1133 dhcp_option_trailer(dhcp);
segundo 0:ac1725ba162c 1134
segundo 0:ac1725ba162c 1135 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
segundo 0:ac1725ba162c 1136
segundo 0:ac1725ba162c 1137 /* broadcast to server */
segundo 0:ac1725ba162c 1138 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
segundo 0:ac1725ba162c 1139 dhcp_delete_msg(dhcp);
segundo 0:ac1725ba162c 1140 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot: REBOOTING\n"));
segundo 0:ac1725ba162c 1141 } else {
segundo 0:ac1725ba162c 1142 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_reboot: could not allocate DHCP request\n"));
segundo 0:ac1725ba162c 1143 }
segundo 0:ac1725ba162c 1144 dhcp->tries++;
segundo 0:ac1725ba162c 1145 msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
segundo 0:ac1725ba162c 1146 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
segundo 0:ac1725ba162c 1147 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot(): set request timeout %"U16_F" msecs\n", msecs));
segundo 0:ac1725ba162c 1148 return result;
segundo 0:ac1725ba162c 1149 }
segundo 0:ac1725ba162c 1150
segundo 0:ac1725ba162c 1151
segundo 0:ac1725ba162c 1152 /**
segundo 0:ac1725ba162c 1153 * Release a DHCP lease.
segundo 0:ac1725ba162c 1154 *
segundo 0:ac1725ba162c 1155 * @param netif network interface which must release its lease
segundo 0:ac1725ba162c 1156 */
segundo 0:ac1725ba162c 1157 err_t
segundo 0:ac1725ba162c 1158 dhcp_release(struct netif *netif)
segundo 0:ac1725ba162c 1159 {
segundo 0:ac1725ba162c 1160 struct dhcp *dhcp = netif->dhcp;
segundo 0:ac1725ba162c 1161 err_t result;
segundo 0:ac1725ba162c 1162 u16_t msecs;
segundo 0:ac1725ba162c 1163 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_release()\n"));
segundo 0:ac1725ba162c 1164
segundo 0:ac1725ba162c 1165 /* idle DHCP client */
segundo 0:ac1725ba162c 1166 dhcp_set_state(dhcp, DHCP_OFF);
segundo 0:ac1725ba162c 1167 /* clean old DHCP offer */
segundo 0:ac1725ba162c 1168 ip_addr_set_zero(&dhcp->server_ip_addr);
segundo 0:ac1725ba162c 1169 ip_addr_set_zero(&dhcp->offered_ip_addr);
segundo 0:ac1725ba162c 1170 ip_addr_set_zero(&dhcp->offered_sn_mask);
segundo 0:ac1725ba162c 1171 ip_addr_set_zero(&dhcp->offered_gw_addr);
segundo 0:ac1725ba162c 1172 #if LWIP_DHCP_BOOTP_FILE
segundo 0:ac1725ba162c 1173 ip_addr_set_zero(&dhcp->offered_si_addr);
segundo 0:ac1725ba162c 1174 #endif /* LWIP_DHCP_BOOTP_FILE */
segundo 0:ac1725ba162c 1175 dhcp->offered_t0_lease = dhcp->offered_t1_renew = dhcp->offered_t2_rebind = 0;
segundo 0:ac1725ba162c 1176
segundo 0:ac1725ba162c 1177 /* create and initialize the DHCP message header */
segundo 0:ac1725ba162c 1178 result = dhcp_create_msg(netif, dhcp, DHCP_RELEASE);
segundo 0:ac1725ba162c 1179 if (result == ERR_OK) {
segundo 0:ac1725ba162c 1180 dhcp_option_trailer(dhcp);
segundo 0:ac1725ba162c 1181
segundo 0:ac1725ba162c 1182 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
segundo 0:ac1725ba162c 1183
segundo 0:ac1725ba162c 1184 udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
segundo 0:ac1725ba162c 1185 dhcp_delete_msg(dhcp);
segundo 0:ac1725ba162c 1186 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_release: RELEASED, DHCP_OFF\n"));
segundo 0:ac1725ba162c 1187 } else {
segundo 0:ac1725ba162c 1188 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_release: could not allocate DHCP request\n"));
segundo 0:ac1725ba162c 1189 }
segundo 0:ac1725ba162c 1190 dhcp->tries++;
segundo 0:ac1725ba162c 1191 msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
segundo 0:ac1725ba162c 1192 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
segundo 0:ac1725ba162c 1193 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_release(): set request timeout %"U16_F" msecs\n", msecs));
segundo 0:ac1725ba162c 1194 /* bring the interface down */
segundo 0:ac1725ba162c 1195 netif_set_down(netif);
segundo 0:ac1725ba162c 1196 /* remove IP address from interface */
segundo 0:ac1725ba162c 1197 netif_set_ipaddr(netif, IP_ADDR_ANY);
segundo 0:ac1725ba162c 1198 netif_set_gw(netif, IP_ADDR_ANY);
segundo 0:ac1725ba162c 1199 netif_set_netmask(netif, IP_ADDR_ANY);
segundo 0:ac1725ba162c 1200
segundo 0:ac1725ba162c 1201 return result;
segundo 0:ac1725ba162c 1202 }
segundo 0:ac1725ba162c 1203
segundo 0:ac1725ba162c 1204 /**
segundo 0:ac1725ba162c 1205 * Remove the DHCP client from the interface.
segundo 0:ac1725ba162c 1206 *
segundo 0:ac1725ba162c 1207 * @param netif The network interface to stop DHCP on
segundo 0:ac1725ba162c 1208 */
segundo 0:ac1725ba162c 1209 void
segundo 0:ac1725ba162c 1210 dhcp_stop(struct netif *netif)
segundo 0:ac1725ba162c 1211 {
segundo 0:ac1725ba162c 1212 struct dhcp *dhcp;
segundo 0:ac1725ba162c 1213 LWIP_ERROR("dhcp_stop: netif != NULL", (netif != NULL), return;);
segundo 0:ac1725ba162c 1214 dhcp = netif->dhcp;
segundo 0:ac1725ba162c 1215 /* Remove the flag that says this netif is handled by DHCP. */
segundo 0:ac1725ba162c 1216 netif->flags &= ~NETIF_FLAG_DHCP;
segundo 0:ac1725ba162c 1217
segundo 0:ac1725ba162c 1218 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_stop()\n"));
segundo 0:ac1725ba162c 1219 /* netif is DHCP configured? */
segundo 0:ac1725ba162c 1220 if (dhcp != NULL) {
segundo 0:ac1725ba162c 1221 #if LWIP_DHCP_AUTOIP_COOP
segundo 0:ac1725ba162c 1222 if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
segundo 0:ac1725ba162c 1223 autoip_stop(netif);
segundo 0:ac1725ba162c 1224 dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
segundo 0:ac1725ba162c 1225 }
segundo 0:ac1725ba162c 1226 #endif /* LWIP_DHCP_AUTOIP_COOP */
segundo 0:ac1725ba162c 1227
segundo 0:ac1725ba162c 1228 if (dhcp->pcb != NULL) {
segundo 0:ac1725ba162c 1229 udp_remove(dhcp->pcb);
segundo 0:ac1725ba162c 1230 dhcp->pcb = NULL;
segundo 0:ac1725ba162c 1231 }
segundo 0:ac1725ba162c 1232 LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
segundo 0:ac1725ba162c 1233 dhcp_set_state(dhcp, DHCP_OFF);
segundo 0:ac1725ba162c 1234 }
segundo 0:ac1725ba162c 1235 }
segundo 0:ac1725ba162c 1236
segundo 0:ac1725ba162c 1237 /*
segundo 0:ac1725ba162c 1238 * Set the DHCP state of a DHCP client.
segundo 0:ac1725ba162c 1239 *
segundo 0:ac1725ba162c 1240 * If the state changed, reset the number of tries.
segundo 0:ac1725ba162c 1241 */
segundo 0:ac1725ba162c 1242 static void
segundo 0:ac1725ba162c 1243 dhcp_set_state(struct dhcp *dhcp, u8_t new_state)
segundo 0:ac1725ba162c 1244 {
segundo 0:ac1725ba162c 1245 if (new_state != dhcp->state) {
segundo 0:ac1725ba162c 1246 dhcp->state = new_state;
segundo 0:ac1725ba162c 1247 dhcp->tries = 0;
segundo 0:ac1725ba162c 1248 dhcp->request_timeout = 0;
segundo 0:ac1725ba162c 1249 }
segundo 0:ac1725ba162c 1250 }
segundo 0:ac1725ba162c 1251
segundo 0:ac1725ba162c 1252 /*
segundo 0:ac1725ba162c 1253 * Concatenate an option type and length field to the outgoing
segundo 0:ac1725ba162c 1254 * DHCP message.
segundo 0:ac1725ba162c 1255 *
segundo 0:ac1725ba162c 1256 */
segundo 0:ac1725ba162c 1257 static void
segundo 0:ac1725ba162c 1258 dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len)
segundo 0:ac1725ba162c 1259 {
segundo 0:ac1725ba162c 1260 LWIP_ASSERT("dhcp_option: dhcp->options_out_len + 2 + option_len <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U + option_len <= DHCP_OPTIONS_LEN);
segundo 0:ac1725ba162c 1261 dhcp->msg_out->options[dhcp->options_out_len++] = option_type;
segundo 0:ac1725ba162c 1262 dhcp->msg_out->options[dhcp->options_out_len++] = option_len;
segundo 0:ac1725ba162c 1263 }
segundo 0:ac1725ba162c 1264 /*
segundo 0:ac1725ba162c 1265 * Concatenate a single byte to the outgoing DHCP message.
segundo 0:ac1725ba162c 1266 *
segundo 0:ac1725ba162c 1267 */
segundo 0:ac1725ba162c 1268 static void
segundo 0:ac1725ba162c 1269 dhcp_option_byte(struct dhcp *dhcp, u8_t value)
segundo 0:ac1725ba162c 1270 {
segundo 0:ac1725ba162c 1271 LWIP_ASSERT("dhcp_option_byte: dhcp->options_out_len < DHCP_OPTIONS_LEN", dhcp->options_out_len < DHCP_OPTIONS_LEN);
segundo 0:ac1725ba162c 1272 dhcp->msg_out->options[dhcp->options_out_len++] = value;
segundo 0:ac1725ba162c 1273 }
segundo 0:ac1725ba162c 1274
segundo 0:ac1725ba162c 1275 static void
segundo 0:ac1725ba162c 1276 dhcp_option_short(struct dhcp *dhcp, u16_t value)
segundo 0:ac1725ba162c 1277 {
segundo 0:ac1725ba162c 1278 LWIP_ASSERT("dhcp_option_short: dhcp->options_out_len + 2 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U <= DHCP_OPTIONS_LEN);
segundo 0:ac1725ba162c 1279 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff00U) >> 8);
segundo 0:ac1725ba162c 1280 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t) (value & 0x00ffU);
segundo 0:ac1725ba162c 1281 }
segundo 0:ac1725ba162c 1282
segundo 0:ac1725ba162c 1283 static void
segundo 0:ac1725ba162c 1284 dhcp_option_long(struct dhcp *dhcp, u32_t value)
segundo 0:ac1725ba162c 1285 {
segundo 0:ac1725ba162c 1286 LWIP_ASSERT("dhcp_option_long: dhcp->options_out_len + 4 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 4U <= DHCP_OPTIONS_LEN);
segundo 0:ac1725ba162c 1287 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff000000UL) >> 24);
segundo 0:ac1725ba162c 1288 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x00ff0000UL) >> 16);
segundo 0:ac1725ba162c 1289 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x0000ff00UL) >> 8);
segundo 0:ac1725ba162c 1290 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x000000ffUL));
segundo 0:ac1725ba162c 1291 }
segundo 0:ac1725ba162c 1292
segundo 0:ac1725ba162c 1293 /**
segundo 0:ac1725ba162c 1294 * Extract the DHCP message and the DHCP options.
segundo 0:ac1725ba162c 1295 *
segundo 0:ac1725ba162c 1296 * Extract the DHCP message and the DHCP options, each into a contiguous
segundo 0:ac1725ba162c 1297 * piece of memory. As a DHCP message is variable sized by its options,
segundo 0:ac1725ba162c 1298 * and also allows overriding some fields for options, the easy approach
segundo 0:ac1725ba162c 1299 * is to first unfold the options into a conitguous piece of memory, and
segundo 0:ac1725ba162c 1300 * use that further on.
segundo 0:ac1725ba162c 1301 *
segundo 0:ac1725ba162c 1302 */
segundo 0:ac1725ba162c 1303 static err_t
segundo 0:ac1725ba162c 1304 dhcp_parse_reply(struct dhcp *dhcp, struct pbuf *p)
segundo 0:ac1725ba162c 1305 {
segundo 0:ac1725ba162c 1306 u8_t *options;
segundo 0:ac1725ba162c 1307 u16_t offset;
segundo 0:ac1725ba162c 1308 u16_t offset_max;
segundo 0:ac1725ba162c 1309 u16_t options_idx;
segundo 0:ac1725ba162c 1310 u16_t options_idx_max;
segundo 0:ac1725ba162c 1311 struct pbuf *q;
segundo 0:ac1725ba162c 1312 int parse_file_as_options = 0;
segundo 0:ac1725ba162c 1313 int parse_sname_as_options = 0;
segundo 0:ac1725ba162c 1314
segundo 0:ac1725ba162c 1315 /* clear received options */
segundo 0:ac1725ba162c 1316 dhcp_clear_all_options(dhcp);
segundo 0:ac1725ba162c 1317 /* check that beginning of dhcp_msg (up to and including chaddr) is in first pbuf */
segundo 0:ac1725ba162c 1318 if (p->len < DHCP_SNAME_OFS) {
segundo 0:ac1725ba162c 1319 return ERR_BUF;
segundo 0:ac1725ba162c 1320 }
segundo 0:ac1725ba162c 1321 dhcp->msg_in = (struct dhcp_msg *)p->payload;
segundo 0:ac1725ba162c 1322 #if LWIP_DHCP_BOOTP_FILE
segundo 0:ac1725ba162c 1323 /* clear boot file name */
segundo 0:ac1725ba162c 1324 dhcp->boot_file_name[0] = 0;
segundo 0:ac1725ba162c 1325 #endif /* LWIP_DHCP_BOOTP_FILE */
segundo 0:ac1725ba162c 1326
segundo 0:ac1725ba162c 1327 /* parse options */
segundo 0:ac1725ba162c 1328
segundo 0:ac1725ba162c 1329 /* start with options field */
segundo 0:ac1725ba162c 1330 options_idx = DHCP_OPTIONS_OFS;
segundo 0:ac1725ba162c 1331 /* parse options to the end of the received packet */
segundo 0:ac1725ba162c 1332 options_idx_max = p->tot_len;
segundo 0:ac1725ba162c 1333 again:
segundo 0:ac1725ba162c 1334 q = p;
segundo 0:ac1725ba162c 1335 while((q != NULL) && (options_idx >= q->len)) {
segundo 0:ac1725ba162c 1336 options_idx -= q->len;
segundo 0:ac1725ba162c 1337 options_idx_max -= q->len;
segundo 0:ac1725ba162c 1338 q = q->next;
segundo 0:ac1725ba162c 1339 }
segundo 0:ac1725ba162c 1340 if (q == NULL) {
segundo 0:ac1725ba162c 1341 return ERR_BUF;
segundo 0:ac1725ba162c 1342 }
segundo 0:ac1725ba162c 1343 offset = options_idx;
segundo 0:ac1725ba162c 1344 offset_max = options_idx_max;
segundo 0:ac1725ba162c 1345 options = (u8_t*)q->payload;
segundo 0:ac1725ba162c 1346 /* at least 1 byte to read and no end marker, then at least 3 bytes to read? */
segundo 0:ac1725ba162c 1347 while((q != NULL) && (options[offset] != DHCP_OPTION_END) && (offset < offset_max)) {
segundo 0:ac1725ba162c 1348 u8_t op = options[offset];
segundo 0:ac1725ba162c 1349 u8_t len;
segundo 0:ac1725ba162c 1350 u8_t decode_len = 0;
segundo 0:ac1725ba162c 1351 int decode_idx = -1;
segundo 0:ac1725ba162c 1352 u16_t val_offset = offset + 2;
segundo 0:ac1725ba162c 1353 /* len byte might be in the next pbuf */
segundo 0:ac1725ba162c 1354 if (offset + 1 < q->len) {
segundo 0:ac1725ba162c 1355 len = options[offset + 1];
segundo 0:ac1725ba162c 1356 } else {
segundo 0:ac1725ba162c 1357 len = (q->next != NULL ? ((u8_t*)q->next->payload)[0] : 0);
segundo 0:ac1725ba162c 1358 }
segundo 0:ac1725ba162c 1359 /* LWIP_DEBUGF(DHCP_DEBUG, ("msg_offset=%"U16_F", q->len=%"U16_F, msg_offset, q->len)); */
segundo 0:ac1725ba162c 1360 decode_len = len;
segundo 0:ac1725ba162c 1361 switch(op) {
segundo 0:ac1725ba162c 1362 /* case(DHCP_OPTION_END): handled above */
segundo 0:ac1725ba162c 1363 case(DHCP_OPTION_PAD):
segundo 0:ac1725ba162c 1364 /* special option: no len encoded */
segundo 0:ac1725ba162c 1365 decode_len = len = 0;
segundo 0:ac1725ba162c 1366 /* will be increased below */
segundo 0:ac1725ba162c 1367 offset--;
segundo 0:ac1725ba162c 1368 break;
segundo 0:ac1725ba162c 1369 case(DHCP_OPTION_SUBNET_MASK):
segundo 0:ac1725ba162c 1370 LWIP_ASSERT("len == 4", len == 4);
segundo 0:ac1725ba162c 1371 decode_idx = DHCP_OPTION_IDX_SUBNET_MASK;
segundo 0:ac1725ba162c 1372 break;
segundo 0:ac1725ba162c 1373 case(DHCP_OPTION_ROUTER):
segundo 0:ac1725ba162c 1374 decode_len = 4; /* only copy the first given router */
segundo 0:ac1725ba162c 1375 LWIP_ASSERT("len >= decode_len", len >= decode_len);
segundo 0:ac1725ba162c 1376 decode_idx = DHCP_OPTION_IDX_ROUTER;
segundo 0:ac1725ba162c 1377 break;
segundo 0:ac1725ba162c 1378 case(DHCP_OPTION_DNS_SERVER):
segundo 0:ac1725ba162c 1379 /* special case: there might be more than one server */
segundo 0:ac1725ba162c 1380 LWIP_ASSERT("len % 4 == 0", len % 4 == 0);
segundo 0:ac1725ba162c 1381 /* limit number of DNS servers */
segundo 0:ac1725ba162c 1382 decode_len = LWIP_MIN(len, 4 * DNS_MAX_SERVERS);
segundo 0:ac1725ba162c 1383 LWIP_ASSERT("len >= decode_len", len >= decode_len);
segundo 0:ac1725ba162c 1384 decode_idx = DHCP_OPTION_IDX_DNS_SERVER;
segundo 0:ac1725ba162c 1385 break;
segundo 0:ac1725ba162c 1386 case(DHCP_OPTION_LEASE_TIME):
segundo 0:ac1725ba162c 1387 LWIP_ASSERT("len == 4", len == 4);
segundo 0:ac1725ba162c 1388 decode_idx = DHCP_OPTION_IDX_LEASE_TIME;
segundo 0:ac1725ba162c 1389 break;
segundo 0:ac1725ba162c 1390 case(DHCP_OPTION_OVERLOAD):
segundo 0:ac1725ba162c 1391 LWIP_ASSERT("len == 1", len == 1);
segundo 0:ac1725ba162c 1392 decode_idx = DHCP_OPTION_IDX_OVERLOAD;
segundo 0:ac1725ba162c 1393 break;
segundo 0:ac1725ba162c 1394 case(DHCP_OPTION_MESSAGE_TYPE):
segundo 0:ac1725ba162c 1395 LWIP_ASSERT("len == 1", len == 1);
segundo 0:ac1725ba162c 1396 decode_idx = DHCP_OPTION_IDX_MSG_TYPE;
segundo 0:ac1725ba162c 1397 break;
segundo 0:ac1725ba162c 1398 case(DHCP_OPTION_SERVER_ID):
segundo 0:ac1725ba162c 1399 LWIP_ASSERT("len == 4", len == 4);
segundo 0:ac1725ba162c 1400 decode_idx = DHCP_OPTION_IDX_SERVER_ID;
segundo 0:ac1725ba162c 1401 break;
segundo 0:ac1725ba162c 1402 case(DHCP_OPTION_T1):
segundo 0:ac1725ba162c 1403 LWIP_ASSERT("len == 4", len == 4);
segundo 0:ac1725ba162c 1404 decode_idx = DHCP_OPTION_IDX_T1;
segundo 0:ac1725ba162c 1405 break;
segundo 0:ac1725ba162c 1406 case(DHCP_OPTION_T2):
segundo 0:ac1725ba162c 1407 LWIP_ASSERT("len == 4", len == 4);
segundo 0:ac1725ba162c 1408 decode_idx = DHCP_OPTION_IDX_T2;
segundo 0:ac1725ba162c 1409 break;
segundo 0:ac1725ba162c 1410 default:
segundo 0:ac1725ba162c 1411 decode_len = 0;
segundo 0:ac1725ba162c 1412 LWIP_DEBUGF(DHCP_DEBUG, ("skipping option %"U16_F" in options\n", op));
segundo 0:ac1725ba162c 1413 break;
segundo 0:ac1725ba162c 1414 }
segundo 0:ac1725ba162c 1415 offset += len + 2;
segundo 0:ac1725ba162c 1416 if (decode_len > 0) {
segundo 0:ac1725ba162c 1417 u32_t value = 0;
segundo 0:ac1725ba162c 1418 u16_t copy_len;
segundo 0:ac1725ba162c 1419 decode_next:
segundo 0:ac1725ba162c 1420 LWIP_ASSERT("check decode_idx", decode_idx >= 0 && decode_idx < DHCP_OPTION_IDX_MAX);
segundo 0:ac1725ba162c 1421 LWIP_ASSERT("option already decoded", !dhcp_option_given(dhcp, decode_idx));
segundo 0:ac1725ba162c 1422 copy_len = LWIP_MIN(decode_len, 4);
segundo 0:ac1725ba162c 1423 pbuf_copy_partial(q, &value, copy_len, val_offset);
segundo 0:ac1725ba162c 1424 if (decode_len > 4) {
segundo 0:ac1725ba162c 1425 /* decode more than one u32_t */
segundo 0:ac1725ba162c 1426 LWIP_ASSERT("decode_len % 4 == 0", decode_len % 4 == 0);
segundo 0:ac1725ba162c 1427 dhcp_got_option(dhcp, decode_idx);
segundo 0:ac1725ba162c 1428 dhcp_set_option_value(dhcp, decode_idx, htonl(value));
segundo 0:ac1725ba162c 1429 decode_len -= 4;
segundo 0:ac1725ba162c 1430 val_offset += 4;
segundo 0:ac1725ba162c 1431 decode_idx++;
segundo 0:ac1725ba162c 1432 goto decode_next;
segundo 0:ac1725ba162c 1433 } else if (decode_len == 4) {
segundo 0:ac1725ba162c 1434 value = ntohl(value);
segundo 0:ac1725ba162c 1435 } else {
segundo 0:ac1725ba162c 1436 LWIP_ASSERT("invalid decode_len", decode_len == 1);
segundo 0:ac1725ba162c 1437 value = ((u8_t*)&value)[0];
segundo 0:ac1725ba162c 1438 }
segundo 0:ac1725ba162c 1439 dhcp_got_option(dhcp, decode_idx);
segundo 0:ac1725ba162c 1440 dhcp_set_option_value(dhcp, decode_idx, value);
segundo 0:ac1725ba162c 1441 }
segundo 0:ac1725ba162c 1442 if (offset >= q->len) {
segundo 0:ac1725ba162c 1443 offset -= q->len;
segundo 0:ac1725ba162c 1444 offset_max -= q->len;
segundo 0:ac1725ba162c 1445 q = q->next;
segundo 0:ac1725ba162c 1446 options = (u8_t*)q->payload;
segundo 0:ac1725ba162c 1447 }
segundo 0:ac1725ba162c 1448 }
segundo 0:ac1725ba162c 1449 /* is this an overloaded message? */
segundo 0:ac1725ba162c 1450 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_OVERLOAD)) {
segundo 0:ac1725ba162c 1451 u32_t overload = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_OVERLOAD);
segundo 0:ac1725ba162c 1452 dhcp_clear_option(dhcp, DHCP_OPTION_IDX_OVERLOAD);
segundo 0:ac1725ba162c 1453 if (overload == DHCP_OVERLOAD_FILE) {
segundo 0:ac1725ba162c 1454 parse_file_as_options = 1;
segundo 0:ac1725ba162c 1455 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded file field\n"));
segundo 0:ac1725ba162c 1456 } else if (overload == DHCP_OVERLOAD_SNAME) {
segundo 0:ac1725ba162c 1457 parse_sname_as_options = 1;
segundo 0:ac1725ba162c 1458 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded sname field\n"));
segundo 0:ac1725ba162c 1459 } else if (overload == DHCP_OVERLOAD_SNAME_FILE) {
segundo 0:ac1725ba162c 1460 parse_sname_as_options = 1;
segundo 0:ac1725ba162c 1461 parse_file_as_options = 1;
segundo 0:ac1725ba162c 1462 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded sname and file field\n"));
segundo 0:ac1725ba162c 1463 } else {
segundo 0:ac1725ba162c 1464 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("invalid overload option: %d\n", (int)overload));
segundo 0:ac1725ba162c 1465 }
segundo 0:ac1725ba162c 1466 #if LWIP_DHCP_BOOTP_FILE
segundo 0:ac1725ba162c 1467 if (!parse_file_as_options) {
segundo 0:ac1725ba162c 1468 /* only do this for ACK messages */
segundo 0:ac1725ba162c 1469 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE) &&
segundo 0:ac1725ba162c 1470 (dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE) == DHCP_ACK))
segundo 0:ac1725ba162c 1471 /* copy bootp file name, don't care for sname (server hostname) */
segundo 0:ac1725ba162c 1472 pbuf_copy_partial(p, dhcp->boot_file_name, DHCP_FILE_LEN-1, DHCP_FILE_OFS);
segundo 0:ac1725ba162c 1473 /* make sure the string is really NULL-terminated */
segundo 0:ac1725ba162c 1474 dhcp->boot_file_name[DHCP_FILE_LEN-1] = 0;
segundo 0:ac1725ba162c 1475 }
segundo 0:ac1725ba162c 1476 #endif /* LWIP_DHCP_BOOTP_FILE */
segundo 0:ac1725ba162c 1477 }
segundo 0:ac1725ba162c 1478 if (parse_file_as_options) {
segundo 0:ac1725ba162c 1479 /* if both are overloaded, parse file first and then sname (RFC 2131 ch. 4.1) */
segundo 0:ac1725ba162c 1480 parse_file_as_options = 0;
segundo 0:ac1725ba162c 1481 options_idx = DHCP_FILE_OFS;
segundo 0:ac1725ba162c 1482 options_idx_max = DHCP_FILE_OFS + DHCP_FILE_LEN;
segundo 0:ac1725ba162c 1483 goto again;
segundo 0:ac1725ba162c 1484 } else if (parse_sname_as_options) {
segundo 0:ac1725ba162c 1485 parse_sname_as_options = 0;
segundo 0:ac1725ba162c 1486 options_idx = DHCP_SNAME_OFS;
segundo 0:ac1725ba162c 1487 options_idx_max = DHCP_SNAME_OFS + DHCP_SNAME_LEN;
segundo 0:ac1725ba162c 1488 goto again;
segundo 0:ac1725ba162c 1489 }
segundo 0:ac1725ba162c 1490 return ERR_OK;
segundo 0:ac1725ba162c 1491 }
segundo 0:ac1725ba162c 1492
segundo 0:ac1725ba162c 1493 /**
segundo 0:ac1725ba162c 1494 * If an incoming DHCP message is in response to us, then trigger the state machine
segundo 0:ac1725ba162c 1495 */
segundo 0:ac1725ba162c 1496 static void
segundo 0:ac1725ba162c 1497 dhcp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port)
segundo 0:ac1725ba162c 1498 {
segundo 0:ac1725ba162c 1499 struct netif *netif = (struct netif *)arg;
segundo 0:ac1725ba162c 1500 struct dhcp *dhcp = netif->dhcp;
segundo 0:ac1725ba162c 1501 struct dhcp_msg *reply_msg = (struct dhcp_msg *)p->payload;
segundo 0:ac1725ba162c 1502 u8_t msg_type;
segundo 0:ac1725ba162c 1503 u8_t i;
segundo 0:ac1725ba162c 1504 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,
segundo 0:ac1725ba162c 1505 ip4_addr1_16(addr), ip4_addr2_16(addr), ip4_addr3_16(addr), ip4_addr4_16(addr), port));
segundo 0:ac1725ba162c 1506 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("pbuf->len = %"U16_F"\n", p->len));
segundo 0:ac1725ba162c 1507 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("pbuf->tot_len = %"U16_F"\n", p->tot_len));
segundo 0:ac1725ba162c 1508 /* prevent warnings about unused arguments */
segundo 0:ac1725ba162c 1509 LWIP_UNUSED_ARG(pcb);
segundo 0:ac1725ba162c 1510 LWIP_UNUSED_ARG(addr);
segundo 0:ac1725ba162c 1511 LWIP_UNUSED_ARG(port);
segundo 0:ac1725ba162c 1512
segundo 0:ac1725ba162c 1513 LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
segundo 0:ac1725ba162c 1514
segundo 0:ac1725ba162c 1515 if (p->len < DHCP_MIN_REPLY_LEN) {
segundo 0:ac1725ba162c 1516 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("DHCP reply message or pbuf too short\n"));
segundo 0:ac1725ba162c 1517 goto free_pbuf_and_return;
segundo 0:ac1725ba162c 1518 }
segundo 0:ac1725ba162c 1519
segundo 0:ac1725ba162c 1520 if (reply_msg->op != DHCP_BOOTREPLY) {
segundo 0:ac1725ba162c 1521 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));
segundo 0:ac1725ba162c 1522 goto free_pbuf_and_return;
segundo 0:ac1725ba162c 1523 }
segundo 0:ac1725ba162c 1524 /* iterate through hardware address and match against DHCP message */
segundo 0:ac1725ba162c 1525 for (i = 0; i < netif->hwaddr_len; i++) {
segundo 0:ac1725ba162c 1526 if (netif->hwaddr[i] != reply_msg->chaddr[i]) {
segundo 0:ac1725ba162c 1527 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
segundo 0:ac1725ba162c 1528 ("netif->hwaddr[%"U16_F"]==%02"X16_F" != reply_msg->chaddr[%"U16_F"]==%02"X16_F"\n",
segundo 0:ac1725ba162c 1529 (u16_t)i, (u16_t)netif->hwaddr[i], (u16_t)i, (u16_t)reply_msg->chaddr[i]));
segundo 0:ac1725ba162c 1530 goto free_pbuf_and_return;
segundo 0:ac1725ba162c 1531 }
segundo 0:ac1725ba162c 1532 }
segundo 0:ac1725ba162c 1533 /* match transaction ID against what we expected */
segundo 0:ac1725ba162c 1534 if (ntohl(reply_msg->xid) != dhcp->xid) {
segundo 0:ac1725ba162c 1535 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
segundo 0:ac1725ba162c 1536 ("transaction id mismatch reply_msg->xid(%"X32_F")!=dhcp->xid(%"X32_F")\n",ntohl(reply_msg->xid),dhcp->xid));
segundo 0:ac1725ba162c 1537 goto free_pbuf_and_return;
segundo 0:ac1725ba162c 1538 }
segundo 0:ac1725ba162c 1539 /* option fields could be unfold? */
segundo 0:ac1725ba162c 1540 if (dhcp_parse_reply(dhcp, p) != ERR_OK) {
segundo 0:ac1725ba162c 1541 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
segundo 0:ac1725ba162c 1542 ("problem unfolding DHCP message - too short on memory?\n"));
segundo 0:ac1725ba162c 1543 goto free_pbuf_and_return;
segundo 0:ac1725ba162c 1544 }
segundo 0:ac1725ba162c 1545
segundo 0:ac1725ba162c 1546 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("searching DHCP_OPTION_MESSAGE_TYPE\n"));
segundo 0:ac1725ba162c 1547 /* obtain pointer to DHCP message type */
segundo 0:ac1725ba162c 1548 if (!dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE)) {
segundo 0:ac1725ba162c 1549 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("DHCP_OPTION_MESSAGE_TYPE option not found\n"));
segundo 0:ac1725ba162c 1550 goto free_pbuf_and_return;
segundo 0:ac1725ba162c 1551 }
segundo 0:ac1725ba162c 1552
segundo 0:ac1725ba162c 1553 /* read DHCP message type */
segundo 0:ac1725ba162c 1554 msg_type = (u8_t)dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE);
segundo 0:ac1725ba162c 1555 /* message type is DHCP ACK? */
segundo 0:ac1725ba162c 1556 if (msg_type == DHCP_ACK) {
segundo 0:ac1725ba162c 1557 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_ACK received\n"));
segundo 0:ac1725ba162c 1558 /* in requesting state? */
segundo 0:ac1725ba162c 1559 if (dhcp->state == DHCP_REQUESTING) {
segundo 0:ac1725ba162c 1560 dhcp_handle_ack(netif);
segundo 0:ac1725ba162c 1561 #if DHCP_DOES_ARP_CHECK
segundo 0:ac1725ba162c 1562 /* check if the acknowledged lease address is already in use */
segundo 0:ac1725ba162c 1563 dhcp_check(netif);
segundo 0:ac1725ba162c 1564 #else
segundo 0:ac1725ba162c 1565 /* bind interface to the acknowledged lease address */
segundo 0:ac1725ba162c 1566 dhcp_bind(netif);
segundo 0:ac1725ba162c 1567 #endif
segundo 0:ac1725ba162c 1568 }
segundo 0:ac1725ba162c 1569 /* already bound to the given lease address? */
segundo 0:ac1725ba162c 1570 else if ((dhcp->state == DHCP_REBOOTING) || (dhcp->state == DHCP_REBINDING) || (dhcp->state == DHCP_RENEWING)) {
segundo 0:ac1725ba162c 1571 dhcp_bind(netif);
segundo 0:ac1725ba162c 1572 }
segundo 0:ac1725ba162c 1573 }
segundo 0:ac1725ba162c 1574 /* received a DHCP_NAK in appropriate state? */
segundo 0:ac1725ba162c 1575 else if ((msg_type == DHCP_NAK) &&
segundo 0:ac1725ba162c 1576 ((dhcp->state == DHCP_REBOOTING) || (dhcp->state == DHCP_REQUESTING) ||
segundo 0:ac1725ba162c 1577 (dhcp->state == DHCP_REBINDING) || (dhcp->state == DHCP_RENEWING ))) {
segundo 0:ac1725ba162c 1578 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_NAK received\n"));
segundo 0:ac1725ba162c 1579 dhcp_handle_nak(netif);
segundo 0:ac1725ba162c 1580 }
segundo 0:ac1725ba162c 1581 /* received a DHCP_OFFER in DHCP_SELECTING state? */
segundo 0:ac1725ba162c 1582 else if ((msg_type == DHCP_OFFER) && (dhcp->state == DHCP_SELECTING)) {
segundo 0:ac1725ba162c 1583 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_OFFER received in DHCP_SELECTING state\n"));
segundo 0:ac1725ba162c 1584 dhcp->request_timeout = 0;
segundo 0:ac1725ba162c 1585 /* remember offered lease */
segundo 0:ac1725ba162c 1586 dhcp_handle_offer(netif);
segundo 0:ac1725ba162c 1587 }
segundo 0:ac1725ba162c 1588 free_pbuf_and_return:
segundo 0:ac1725ba162c 1589 dhcp->msg_in = NULL;
segundo 0:ac1725ba162c 1590 pbuf_free(p);
segundo 0:ac1725ba162c 1591 }
segundo 0:ac1725ba162c 1592
segundo 0:ac1725ba162c 1593 /**
segundo 0:ac1725ba162c 1594 * Create a DHCP request, fill in common headers
segundo 0:ac1725ba162c 1595 *
segundo 0:ac1725ba162c 1596 * @param netif the netif under DHCP control
segundo 0:ac1725ba162c 1597 * @param dhcp dhcp control struct
segundo 0:ac1725ba162c 1598 * @param message_type message type of the request
segundo 0:ac1725ba162c 1599 */
segundo 0:ac1725ba162c 1600 static err_t
segundo 0:ac1725ba162c 1601 dhcp_create_msg(struct netif *netif, struct dhcp *dhcp, u8_t message_type)
segundo 0:ac1725ba162c 1602 {
segundo 0:ac1725ba162c 1603 u16_t i;
segundo 0:ac1725ba162c 1604 #ifndef DHCP_GLOBAL_XID
segundo 0:ac1725ba162c 1605 /** default global transaction identifier starting value (easy to match
segundo 0:ac1725ba162c 1606 * with a packet analyser). We simply increment for each new request.
segundo 0:ac1725ba162c 1607 * Predefine DHCP_GLOBAL_XID to a better value or a function call to generate one
segundo 0:ac1725ba162c 1608 * at runtime, any supporting function prototypes can be defined in DHCP_GLOBAL_XID_HEADER */
segundo 0:ac1725ba162c 1609 static u32_t xid = 0xABCD0000;
segundo 0:ac1725ba162c 1610 #else
segundo 0:ac1725ba162c 1611 static u32_t xid;
segundo 0:ac1725ba162c 1612 static u8_t xid_initialised = 0;
segundo 0:ac1725ba162c 1613 if (!xid_initialised) {
segundo 0:ac1725ba162c 1614 xid = DHCP_GLOBAL_XID;
segundo 0:ac1725ba162c 1615 xid_initialised = !xid_initialised;
segundo 0:ac1725ba162c 1616 }
segundo 0:ac1725ba162c 1617 #endif
segundo 0:ac1725ba162c 1618 LWIP_ERROR("dhcp_create_msg: netif != NULL", (netif != NULL), return ERR_ARG;);
segundo 0:ac1725ba162c 1619 LWIP_ERROR("dhcp_create_msg: dhcp != NULL", (dhcp != NULL), return ERR_VAL;);
segundo 0:ac1725ba162c 1620 LWIP_ASSERT("dhcp_create_msg: dhcp->p_out == NULL", dhcp->p_out == NULL);
segundo 0:ac1725ba162c 1621 LWIP_ASSERT("dhcp_create_msg: dhcp->msg_out == NULL", dhcp->msg_out == NULL);
segundo 0:ac1725ba162c 1622 dhcp->p_out = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct dhcp_msg), PBUF_RAM);
segundo 0:ac1725ba162c 1623 if (dhcp->p_out == NULL) {
segundo 0:ac1725ba162c 1624 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
segundo 0:ac1725ba162c 1625 ("dhcp_create_msg(): could not allocate pbuf\n"));
segundo 0:ac1725ba162c 1626 return ERR_MEM;
segundo 0:ac1725ba162c 1627 }
segundo 0:ac1725ba162c 1628 LWIP_ASSERT("dhcp_create_msg: check that first pbuf can hold struct dhcp_msg",
segundo 0:ac1725ba162c 1629 (dhcp->p_out->len >= sizeof(struct dhcp_msg)));
segundo 0:ac1725ba162c 1630
segundo 0:ac1725ba162c 1631 /* reuse transaction identifier in retransmissions */
segundo 0:ac1725ba162c 1632 if (dhcp->tries == 0) {
segundo 0:ac1725ba162c 1633 xid++;
segundo 0:ac1725ba162c 1634 }
segundo 0:ac1725ba162c 1635 dhcp->xid = xid;
segundo 0:ac1725ba162c 1636 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE,
segundo 0:ac1725ba162c 1637 ("transaction id xid(%"X32_F")\n", xid));
segundo 0:ac1725ba162c 1638
segundo 0:ac1725ba162c 1639 dhcp->msg_out = (struct dhcp_msg *)dhcp->p_out->payload;
segundo 0:ac1725ba162c 1640
segundo 0:ac1725ba162c 1641 dhcp->msg_out->op = DHCP_BOOTREQUEST;
segundo 0:ac1725ba162c 1642 /* TODO: make link layer independent */
segundo 0:ac1725ba162c 1643 dhcp->msg_out->htype = DHCP_HTYPE_ETH;
segundo 0:ac1725ba162c 1644 dhcp->msg_out->hlen = netif->hwaddr_len;
segundo 0:ac1725ba162c 1645 dhcp->msg_out->hops = 0;
segundo 0:ac1725ba162c 1646 dhcp->msg_out->xid = htonl(dhcp->xid);
segundo 0:ac1725ba162c 1647 dhcp->msg_out->secs = 0;
segundo 0:ac1725ba162c 1648 /* we don't need the broadcast flag since we can receive unicast traffic
segundo 0:ac1725ba162c 1649 before being fully configured! */
segundo 0:ac1725ba162c 1650 dhcp->msg_out->flags = 0;
segundo 0:ac1725ba162c 1651 ip_addr_set_zero(&dhcp->msg_out->ciaddr);
segundo 0:ac1725ba162c 1652 /* set ciaddr to netif->ip_addr based on message_type and state */
segundo 0:ac1725ba162c 1653 if ((message_type == DHCP_INFORM) || (message_type == DHCP_DECLINE) ||
segundo 0:ac1725ba162c 1654 ((message_type == DHCP_REQUEST) && /* DHCP_BOUND not used for sending! */
segundo 0:ac1725ba162c 1655 ((dhcp->state==DHCP_RENEWING) || dhcp->state==DHCP_REBINDING))) {
segundo 0:ac1725ba162c 1656 ip_addr_copy(dhcp->msg_out->ciaddr, netif->ip_addr);
segundo 0:ac1725ba162c 1657 }
segundo 0:ac1725ba162c 1658 ip_addr_set_zero(&dhcp->msg_out->yiaddr);
segundo 0:ac1725ba162c 1659 ip_addr_set_zero(&dhcp->msg_out->siaddr);
segundo 0:ac1725ba162c 1660 ip_addr_set_zero(&dhcp->msg_out->giaddr);
segundo 0:ac1725ba162c 1661 for (i = 0; i < DHCP_CHADDR_LEN; i++) {
segundo 0:ac1725ba162c 1662 /* copy netif hardware address, pad with zeroes */
segundo 0:ac1725ba162c 1663 dhcp->msg_out->chaddr[i] = (i < netif->hwaddr_len) ? netif->hwaddr[i] : 0/* pad byte*/;
segundo 0:ac1725ba162c 1664 }
segundo 0:ac1725ba162c 1665 for (i = 0; i < DHCP_SNAME_LEN; i++) {
segundo 0:ac1725ba162c 1666 dhcp->msg_out->sname[i] = 0;
segundo 0:ac1725ba162c 1667 }
segundo 0:ac1725ba162c 1668 for (i = 0; i < DHCP_FILE_LEN; i++) {
segundo 0:ac1725ba162c 1669 dhcp->msg_out->file[i] = 0;
segundo 0:ac1725ba162c 1670 }
segundo 0:ac1725ba162c 1671 dhcp->msg_out->cookie = PP_HTONL(DHCP_MAGIC_COOKIE);
segundo 0:ac1725ba162c 1672 dhcp->options_out_len = 0;
segundo 0:ac1725ba162c 1673 /* fill options field with an incrementing array (for debugging purposes) */
segundo 0:ac1725ba162c 1674 for (i = 0; i < DHCP_OPTIONS_LEN; i++) {
segundo 0:ac1725ba162c 1675 dhcp->msg_out->options[i] = (u8_t)i; /* for debugging only, no matter if truncated */
segundo 0:ac1725ba162c 1676 }
segundo 0:ac1725ba162c 1677 /* Add option MESSAGE_TYPE */
segundo 0:ac1725ba162c 1678 dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
segundo 0:ac1725ba162c 1679 dhcp_option_byte(dhcp, message_type);
segundo 0:ac1725ba162c 1680 return ERR_OK;
segundo 0:ac1725ba162c 1681 }
segundo 0:ac1725ba162c 1682
segundo 0:ac1725ba162c 1683 /**
segundo 0:ac1725ba162c 1684 * Free previously allocated memory used to send a DHCP request.
segundo 0:ac1725ba162c 1685 *
segundo 0:ac1725ba162c 1686 * @param dhcp the dhcp struct to free the request from
segundo 0:ac1725ba162c 1687 */
segundo 0:ac1725ba162c 1688 static void
segundo 0:ac1725ba162c 1689 dhcp_delete_msg(struct dhcp *dhcp)
segundo 0:ac1725ba162c 1690 {
segundo 0:ac1725ba162c 1691 LWIP_ERROR("dhcp_delete_msg: dhcp != NULL", (dhcp != NULL), return;);
segundo 0:ac1725ba162c 1692 LWIP_ASSERT("dhcp_delete_msg: dhcp->p_out != NULL", dhcp->p_out != NULL);
segundo 0:ac1725ba162c 1693 LWIP_ASSERT("dhcp_delete_msg: dhcp->msg_out != NULL", dhcp->msg_out != NULL);
segundo 0:ac1725ba162c 1694 if (dhcp->p_out != NULL) {
segundo 0:ac1725ba162c 1695 pbuf_free(dhcp->p_out);
segundo 0:ac1725ba162c 1696 }
segundo 0:ac1725ba162c 1697 dhcp->p_out = NULL;
segundo 0:ac1725ba162c 1698 dhcp->msg_out = NULL;
segundo 0:ac1725ba162c 1699 }
segundo 0:ac1725ba162c 1700
segundo 0:ac1725ba162c 1701 /**
segundo 0:ac1725ba162c 1702 * Add a DHCP message trailer
segundo 0:ac1725ba162c 1703 *
segundo 0:ac1725ba162c 1704 * Adds the END option to the DHCP message, and if
segundo 0:ac1725ba162c 1705 * necessary, up to three padding bytes.
segundo 0:ac1725ba162c 1706 *
segundo 0:ac1725ba162c 1707 * @param dhcp DHCP state structure
segundo 0:ac1725ba162c 1708 */
segundo 0:ac1725ba162c 1709 static void
segundo 0:ac1725ba162c 1710 dhcp_option_trailer(struct dhcp *dhcp)
segundo 0:ac1725ba162c 1711 {
segundo 0:ac1725ba162c 1712 LWIP_ERROR("dhcp_option_trailer: dhcp != NULL", (dhcp != NULL), return;);
segundo 0:ac1725ba162c 1713 LWIP_ASSERT("dhcp_option_trailer: dhcp->msg_out != NULL\n", dhcp->msg_out != NULL);
segundo 0:ac1725ba162c 1714 LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
segundo 0:ac1725ba162c 1715 dhcp->msg_out->options[dhcp->options_out_len++] = DHCP_OPTION_END;
segundo 0:ac1725ba162c 1716 /* packet is too small, or not 4 byte aligned? */
segundo 0:ac1725ba162c 1717 while ((dhcp->options_out_len < DHCP_MIN_OPTIONS_LEN) || (dhcp->options_out_len & 3)) {
segundo 0:ac1725ba162c 1718 /* 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)); */
segundo 0:ac1725ba162c 1719 LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
segundo 0:ac1725ba162c 1720 /* add a fill/padding byte */
segundo 0:ac1725ba162c 1721 dhcp->msg_out->options[dhcp->options_out_len++] = 0;
segundo 0:ac1725ba162c 1722 }
segundo 0:ac1725ba162c 1723 }
segundo 0:ac1725ba162c 1724
segundo 0:ac1725ba162c 1725 #endif /* LWIP_DHCP */