Mihail Stoyanov / HTTPServer

My fork of the HTTPServer (working)

Dependents:   DGWWebServer LAN2

Core/lwIP/core/dhcp.c@0:7a64fbb4069d, 2012-08-06 (annotated)

Committer:
screamer
Date:
Mon Aug 06 09:23:14 2012 +0000
Revision:
0:7a64fbb4069d
[mbed] converted /DGWWebServer/HTTPServer

Who changed what in which revision?

UserRevisionLine numberNew contents of line
screamer 0:7a64fbb4069d 1 /**
screamer 0:7a64fbb4069d 2 * @file
screamer 0:7a64fbb4069d 3 * Dynamic Host Configuration Protocol client
screamer 0:7a64fbb4069d 4 *
screamer 0:7a64fbb4069d 5 */
screamer 0:7a64fbb4069d 6
screamer 0:7a64fbb4069d 7 /*
screamer 0:7a64fbb4069d 8 *
screamer 0:7a64fbb4069d 9 * Copyright (c) 2001-2004 Leon Woestenberg <leon.woestenberg@gmx.net>
screamer 0:7a64fbb4069d 10 * Copyright (c) 2001-2004 Axon Digital Design B.V., The Netherlands.
screamer 0:7a64fbb4069d 11 * All rights reserved.
screamer 0:7a64fbb4069d 12 *
screamer 0:7a64fbb4069d 13 * Redistribution and use in source and binary forms, with or without modification,
screamer 0:7a64fbb4069d 14 * are permitted provided that the following conditions are met:
screamer 0:7a64fbb4069d 15 *
screamer 0:7a64fbb4069d 16 * 1. Redistributions of source code must retain the above copyright notice,
screamer 0:7a64fbb4069d 17 * this list of conditions and the following disclaimer.
screamer 0:7a64fbb4069d 18 * 2. Redistributions in binary form must reproduce the above copyright notice,
screamer 0:7a64fbb4069d 19 * this list of conditions and the following disclaimer in the documentation
screamer 0:7a64fbb4069d 20 * and/or other materials provided with the distribution.
screamer 0:7a64fbb4069d 21 * 3. The name of the author may not be used to endorse or promote products
screamer 0:7a64fbb4069d 22 * derived from this software without specific prior written permission.
screamer 0:7a64fbb4069d 23 *
screamer 0:7a64fbb4069d 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
screamer 0:7a64fbb4069d 25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
screamer 0:7a64fbb4069d 26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
screamer 0:7a64fbb4069d 27 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
screamer 0:7a64fbb4069d 28 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
screamer 0:7a64fbb4069d 29 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
screamer 0:7a64fbb4069d 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
screamer 0:7a64fbb4069d 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
screamer 0:7a64fbb4069d 32 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
screamer 0:7a64fbb4069d 33 * OF SUCH DAMAGE.
screamer 0:7a64fbb4069d 34 *
screamer 0:7a64fbb4069d 35 * This file is a contribution to the lwIP TCP/IP stack.
screamer 0:7a64fbb4069d 36 * The Swedish Institute of Computer Science and Adam Dunkels
screamer 0:7a64fbb4069d 37 * are specifically granted permission to redistribute this
screamer 0:7a64fbb4069d 38 * source code.
screamer 0:7a64fbb4069d 39 *
screamer 0:7a64fbb4069d 40 * Author: Leon Woestenberg <leon.woestenberg@gmx.net>
screamer 0:7a64fbb4069d 41 *
screamer 0:7a64fbb4069d 42 * This is a DHCP client for the lwIP TCP/IP stack. It aims to conform
screamer 0:7a64fbb4069d 43 * with RFC 2131 and RFC 2132.
screamer 0:7a64fbb4069d 44 *
screamer 0:7a64fbb4069d 45 * TODO:
screamer 0:7a64fbb4069d 46 * - Proper parsing of DHCP messages exploiting file/sname field overloading.
screamer 0:7a64fbb4069d 47 * - Add JavaDoc style documentation (API, internals).
screamer 0:7a64fbb4069d 48 * - Support for interfaces other than Ethernet (SLIP, PPP, ...)
screamer 0:7a64fbb4069d 49 *
screamer 0:7a64fbb4069d 50 * Please coordinate changes and requests with Leon Woestenberg
screamer 0:7a64fbb4069d 51 * <leon.woestenberg@gmx.net>
screamer 0:7a64fbb4069d 52 *
screamer 0:7a64fbb4069d 53 * Integration with your code:
screamer 0:7a64fbb4069d 54 *
screamer 0:7a64fbb4069d 55 * In lwip/dhcp.h
screamer 0:7a64fbb4069d 56 * #define DHCP_COARSE_TIMER_SECS (recommended 60 which is a minute)
screamer 0:7a64fbb4069d 57 * #define DHCP_FINE_TIMER_MSECS (recommended 500 which equals TCP coarse timer)
screamer 0:7a64fbb4069d 58 *
screamer 0:7a64fbb4069d 59 * Then have your application call dhcp_coarse_tmr() and
screamer 0:7a64fbb4069d 60 * dhcp_fine_tmr() on the defined intervals.
screamer 0:7a64fbb4069d 61 *
screamer 0:7a64fbb4069d 62 * dhcp_start(struct netif *netif);
screamer 0:7a64fbb4069d 63 * starts a DHCP client instance which configures the interface by
screamer 0:7a64fbb4069d 64 * obtaining an IP address lease and maintaining it.
screamer 0:7a64fbb4069d 65 *
screamer 0:7a64fbb4069d 66 * Use dhcp_release(netif) to end the lease and use dhcp_stop(netif)
screamer 0:7a64fbb4069d 67 * to remove the DHCP client.
screamer 0:7a64fbb4069d 68 *
screamer 0:7a64fbb4069d 69 */
screamer 0:7a64fbb4069d 70
screamer 0:7a64fbb4069d 71 #include "lwip/opt.h"
screamer 0:7a64fbb4069d 72
screamer 0:7a64fbb4069d 73 #if LWIP_DHCP /* don't build if not configured for use in lwipopts.h */
screamer 0:7a64fbb4069d 74
screamer 0:7a64fbb4069d 75 #include "lwip/stats.h"
screamer 0:7a64fbb4069d 76 #include "lwip/mem.h"
screamer 0:7a64fbb4069d 77 #include "lwip/udp.h"
screamer 0:7a64fbb4069d 78 #include "lwip/ip_addr.h"
screamer 0:7a64fbb4069d 79 #include "lwip/netif.h"
screamer 0:7a64fbb4069d 80 #include "lwip/inet.h"
screamer 0:7a64fbb4069d 81 #include "lwip/sys.h"
screamer 0:7a64fbb4069d 82 #include "lwip/dhcp.h"
screamer 0:7a64fbb4069d 83 #include "lwip/autoip.h"
screamer 0:7a64fbb4069d 84 #include "lwip/dns.h"
screamer 0:7a64fbb4069d 85 #include "netif/etharp.h"
screamer 0:7a64fbb4069d 86
screamer 0:7a64fbb4069d 87 #include <string.h>
screamer 0:7a64fbb4069d 88
screamer 0:7a64fbb4069d 89 /** Default for DHCP_GLOBAL_XID is 0xABCD0000
screamer 0:7a64fbb4069d 90 * This can be changed by defining DHCP_GLOBAL_XID and DHCP_GLOBAL_XID_HEADER, e.g.
screamer 0:7a64fbb4069d 91 * #define DHCP_GLOBAL_XID_HEADER "stdlib.h"
screamer 0:7a64fbb4069d 92 * #define DHCP_GLOBAL_XID rand()
screamer 0:7a64fbb4069d 93 */
screamer 0:7a64fbb4069d 94 #ifdef DHCP_GLOBAL_XID_HEADER
screamer 0:7a64fbb4069d 95 #include DHCP_GLOBAL_XID_HEADER /* include optional starting XID generation prototypes */
screamer 0:7a64fbb4069d 96 #endif
screamer 0:7a64fbb4069d 97
screamer 0:7a64fbb4069d 98 /** DHCP_OPTION_MAX_MSG_SIZE is set to the MTU
screamer 0:7a64fbb4069d 99 * MTU is checked to be big enough in dhcp_start */
screamer 0:7a64fbb4069d 100 #define DHCP_MAX_MSG_LEN(netif) (netif->mtu)
screamer 0:7a64fbb4069d 101 #define DHCP_MAX_MSG_LEN_MIN_REQUIRED 576
screamer 0:7a64fbb4069d 102
screamer 0:7a64fbb4069d 103 /* DHCP client state machine functions */
screamer 0:7a64fbb4069d 104 static void dhcp_handle_ack(struct netif *netif);
screamer 0:7a64fbb4069d 105 static void dhcp_handle_nak(struct netif *netif);
screamer 0:7a64fbb4069d 106 static void dhcp_handle_offer(struct netif *netif);
screamer 0:7a64fbb4069d 107
screamer 0:7a64fbb4069d 108 static err_t dhcp_discover(struct netif *netif);
screamer 0:7a64fbb4069d 109 static err_t dhcp_select(struct netif *netif);
screamer 0:7a64fbb4069d 110 static void dhcp_check(struct netif *netif);
screamer 0:7a64fbb4069d 111 static void dhcp_bind(struct netif *netif);
screamer 0:7a64fbb4069d 112 #if DHCP_DOES_ARP_CHECK
screamer 0:7a64fbb4069d 113 static err_t dhcp_decline(struct netif *netif);
screamer 0:7a64fbb4069d 114 #endif /* DHCP_DOES_ARP_CHECK */
screamer 0:7a64fbb4069d 115 static err_t dhcp_rebind(struct netif *netif);
screamer 0:7a64fbb4069d 116 static void dhcp_set_state(struct dhcp *dhcp, u8_t new_state);
screamer 0:7a64fbb4069d 117
screamer 0:7a64fbb4069d 118 /* receive, unfold, parse and free incoming messages */
screamer 0:7a64fbb4069d 119 static void dhcp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, struct ip_addr *addr, u16_t port);
screamer 0:7a64fbb4069d 120 static err_t dhcp_unfold_reply(struct dhcp *dhcp);
screamer 0:7a64fbb4069d 121 static u8_t *dhcp_get_option_ptr(struct dhcp *dhcp, u8_t option_type);
screamer 0:7a64fbb4069d 122 static u8_t dhcp_get_option_byte(u8_t *ptr);
screamer 0:7a64fbb4069d 123 #if 0
screamer 0:7a64fbb4069d 124 static u16_t dhcp_get_option_short(u8_t *ptr);
screamer 0:7a64fbb4069d 125 #endif
screamer 0:7a64fbb4069d 126 static u32_t dhcp_get_option_long(u8_t *ptr);
screamer 0:7a64fbb4069d 127 static void dhcp_free_reply(struct dhcp *dhcp);
screamer 0:7a64fbb4069d 128
screamer 0:7a64fbb4069d 129 /* set the DHCP timers */
screamer 0:7a64fbb4069d 130 static void dhcp_timeout(struct netif *netif);
screamer 0:7a64fbb4069d 131 static void dhcp_t1_timeout(struct netif *netif);
screamer 0:7a64fbb4069d 132 static void dhcp_t2_timeout(struct netif *netif);
screamer 0:7a64fbb4069d 133
screamer 0:7a64fbb4069d 134 /* build outgoing messages */
screamer 0:7a64fbb4069d 135 /* create a DHCP request, fill in common headers */
screamer 0:7a64fbb4069d 136 static err_t dhcp_create_request(struct netif *netif);
screamer 0:7a64fbb4069d 137 /* free a DHCP request */
screamer 0:7a64fbb4069d 138 static void dhcp_delete_request(struct netif *netif);
screamer 0:7a64fbb4069d 139 /* add a DHCP option (type, then length in bytes) */
screamer 0:7a64fbb4069d 140 static void dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len);
screamer 0:7a64fbb4069d 141 /* add option values */
screamer 0:7a64fbb4069d 142 static void dhcp_option_byte(struct dhcp *dhcp, u8_t value);
screamer 0:7a64fbb4069d 143 static void dhcp_option_short(struct dhcp *dhcp, u16_t value);
screamer 0:7a64fbb4069d 144 static void dhcp_option_long(struct dhcp *dhcp, u32_t value);
screamer 0:7a64fbb4069d 145 /* always add the DHCP options trailer to end and pad */
screamer 0:7a64fbb4069d 146 static void dhcp_option_trailer(struct dhcp *dhcp);
screamer 0:7a64fbb4069d 147
screamer 0:7a64fbb4069d 148 /**
screamer 0:7a64fbb4069d 149 * Back-off the DHCP client (because of a received NAK response).
screamer 0:7a64fbb4069d 150 *
screamer 0:7a64fbb4069d 151 * Back-off the DHCP client because of a received NAK. Receiving a
screamer 0:7a64fbb4069d 152 * NAK means the client asked for something non-sensible, for
screamer 0:7a64fbb4069d 153 * example when it tries to renew a lease obtained on another network.
screamer 0:7a64fbb4069d 154 *
screamer 0:7a64fbb4069d 155 * We clear any existing set IP address and restart DHCP negotiation
screamer 0:7a64fbb4069d 156 * afresh (as per RFC2131 3.2.3).
screamer 0:7a64fbb4069d 157 *
screamer 0:7a64fbb4069d 158 * @param netif the netif under DHCP control
screamer 0:7a64fbb4069d 159 */
screamer 0:7a64fbb4069d 160 static void
screamer 0:7a64fbb4069d 161 dhcp_handle_nak(struct netif *netif)
screamer 0:7a64fbb4069d 162 {
screamer 0:7a64fbb4069d 163 struct dhcp *dhcp = netif->dhcp;
screamer 0:7a64fbb4069d 164 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 3, ("dhcp_handle_nak(netif=%p) %c%c%"U16_F"\n",
screamer 0:7a64fbb4069d 165 (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
screamer 0:7a64fbb4069d 166 /* Set the interface down since the address must no longer be used, as per RFC2131 */
screamer 0:7a64fbb4069d 167 netif_set_down(netif);
screamer 0:7a64fbb4069d 168 /* remove IP address from interface */
screamer 0:7a64fbb4069d 169 netif_set_ipaddr(netif, IP_ADDR_ANY);
screamer 0:7a64fbb4069d 170 netif_set_gw(netif, IP_ADDR_ANY);
screamer 0:7a64fbb4069d 171 netif_set_netmask(netif, IP_ADDR_ANY);
screamer 0:7a64fbb4069d 172 /* Change to a defined state */
screamer 0:7a64fbb4069d 173 dhcp_set_state(dhcp, DHCP_BACKING_OFF);
screamer 0:7a64fbb4069d 174 /* We can immediately restart discovery */
screamer 0:7a64fbb4069d 175 dhcp_discover(netif);
screamer 0:7a64fbb4069d 176 }
screamer 0:7a64fbb4069d 177
screamer 0:7a64fbb4069d 178 /**
screamer 0:7a64fbb4069d 179 * Checks if the offered IP address is already in use.
screamer 0:7a64fbb4069d 180 *
screamer 0:7a64fbb4069d 181 * It does so by sending an ARP request for the offered address and
screamer 0:7a64fbb4069d 182 * entering CHECKING state. If no ARP reply is received within a small
screamer 0:7a64fbb4069d 183 * interval, the address is assumed to be free for use by us.
screamer 0:7a64fbb4069d 184 *
screamer 0:7a64fbb4069d 185 * @param netif the netif under DHCP control
screamer 0:7a64fbb4069d 186 */
screamer 0:7a64fbb4069d 187 static void
screamer 0:7a64fbb4069d 188 dhcp_check(struct netif *netif)
screamer 0:7a64fbb4069d 189 {
screamer 0:7a64fbb4069d 190 struct dhcp *dhcp = netif->dhcp;
screamer 0:7a64fbb4069d 191 err_t result;
screamer 0:7a64fbb4069d 192 u16_t msecs;
screamer 0:7a64fbb4069d 193 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 3, ("dhcp_check(netif=%p) %c%c\n", (void *)netif, (s16_t)netif->name[0],
screamer 0:7a64fbb4069d 194 (s16_t)netif->name[1]));
screamer 0:7a64fbb4069d 195 /* create an ARP query for the offered IP address, expecting that no host
screamer 0:7a64fbb4069d 196 responds, as the IP address should not be in use. */
screamer 0:7a64fbb4069d 197 result = etharp_query(netif, &dhcp->offered_ip_addr, NULL);
screamer 0:7a64fbb4069d 198 if (result != ERR_OK) {
screamer 0:7a64fbb4069d 199 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 2, ("dhcp_check: could not perform ARP query\n"));
screamer 0:7a64fbb4069d 200 }
screamer 0:7a64fbb4069d 201 dhcp->tries++;
screamer 0:7a64fbb4069d 202 msecs = 500;
screamer 0:7a64fbb4069d 203 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
screamer 0:7a64fbb4069d 204 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_check(): set request timeout %"U16_F" msecs\n", msecs));
screamer 0:7a64fbb4069d 205 dhcp_set_state(dhcp, DHCP_CHECKING);
screamer 0:7a64fbb4069d 206 }
screamer 0:7a64fbb4069d 207
screamer 0:7a64fbb4069d 208 /**
screamer 0:7a64fbb4069d 209 * Remember the configuration offered by a DHCP server.
screamer 0:7a64fbb4069d 210 *
screamer 0:7a64fbb4069d 211 * @param netif the netif under DHCP control
screamer 0:7a64fbb4069d 212 */
screamer 0:7a64fbb4069d 213 static void
screamer 0:7a64fbb4069d 214 dhcp_handle_offer(struct netif *netif)
screamer 0:7a64fbb4069d 215 {
screamer 0:7a64fbb4069d 216 struct dhcp *dhcp = netif->dhcp;
screamer 0:7a64fbb4069d 217 /* obtain the server address */
screamer 0:7a64fbb4069d 218 u8_t *option_ptr = dhcp_get_option_ptr(dhcp, DHCP_OPTION_SERVER_ID);
screamer 0:7a64fbb4069d 219 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 3, ("dhcp_handle_offer(netif=%p) %c%c%"U16_F"\n",
screamer 0:7a64fbb4069d 220 (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
screamer 0:7a64fbb4069d 221 if (option_ptr != NULL) {
screamer 0:7a64fbb4069d 222 dhcp->server_ip_addr.addr = htonl(dhcp_get_option_long(&option_ptr[2]));
screamer 0:7a64fbb4069d 223 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_handle_offer(): server 0x%08"X32_F"\n", dhcp->server_ip_addr.addr));
screamer 0:7a64fbb4069d 224 /* remember offered address */
screamer 0:7a64fbb4069d 225 ip_addr_set(&dhcp->offered_ip_addr, (struct ip_addr *)&dhcp->msg_in->yiaddr);
screamer 0:7a64fbb4069d 226 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_handle_offer(): offer for 0x%08"X32_F"\n", dhcp->offered_ip_addr.addr));
screamer 0:7a64fbb4069d 227
screamer 0:7a64fbb4069d 228 dhcp_select(netif);
screamer 0:7a64fbb4069d 229 }
screamer 0:7a64fbb4069d 230 }
screamer 0:7a64fbb4069d 231
screamer 0:7a64fbb4069d 232 /**
screamer 0:7a64fbb4069d 233 * Select a DHCP server offer out of all offers.
screamer 0:7a64fbb4069d 234 *
screamer 0:7a64fbb4069d 235 * Simply select the first offer received.
screamer 0:7a64fbb4069d 236 *
screamer 0:7a64fbb4069d 237 * @param netif the netif under DHCP control
screamer 0:7a64fbb4069d 238 * @return lwIP specific error (see error.h)
screamer 0:7a64fbb4069d 239 */
screamer 0:7a64fbb4069d 240 static err_t
screamer 0:7a64fbb4069d 241 dhcp_select(struct netif *netif)
screamer 0:7a64fbb4069d 242 {
screamer 0:7a64fbb4069d 243 struct dhcp *dhcp = netif->dhcp;
screamer 0:7a64fbb4069d 244 err_t result;
screamer 0:7a64fbb4069d 245 u16_t msecs;
screamer 0:7a64fbb4069d 246 #if LWIP_NETIF_HOSTNAME
screamer 0:7a64fbb4069d 247 const char *p;
screamer 0:7a64fbb4069d 248 #endif /* LWIP_NETIF_HOSTNAME */
screamer 0:7a64fbb4069d 249
screamer 0:7a64fbb4069d 250 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 3, ("dhcp_select(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
screamer 0:7a64fbb4069d 251
screamer 0:7a64fbb4069d 252 /* create and initialize the DHCP message header */
screamer 0:7a64fbb4069d 253 result = dhcp_create_request(netif);
screamer 0:7a64fbb4069d 254 if (result == ERR_OK) {
screamer 0:7a64fbb4069d 255 dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
screamer 0:7a64fbb4069d 256 dhcp_option_byte(dhcp, DHCP_REQUEST);
screamer 0:7a64fbb4069d 257
screamer 0:7a64fbb4069d 258 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
screamer 0:7a64fbb4069d 259 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
screamer 0:7a64fbb4069d 260
screamer 0:7a64fbb4069d 261 /* MUST request the offered IP address */
screamer 0:7a64fbb4069d 262 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
screamer 0:7a64fbb4069d 263 dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
screamer 0:7a64fbb4069d 264
screamer 0:7a64fbb4069d 265 dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
screamer 0:7a64fbb4069d 266 dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
screamer 0:7a64fbb4069d 267
screamer 0:7a64fbb4069d 268 dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);
screamer 0:7a64fbb4069d 269 dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
screamer 0:7a64fbb4069d 270 dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
screamer 0:7a64fbb4069d 271 dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
screamer 0:7a64fbb4069d 272 dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
screamer 0:7a64fbb4069d 273
screamer 0:7a64fbb4069d 274 #if LWIP_NETIF_HOSTNAME
screamer 0:7a64fbb4069d 275 p = (const char*)netif->hostname;
screamer 0:7a64fbb4069d 276 if (p != NULL) {
screamer 0:7a64fbb4069d 277 dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, strlen(p));
screamer 0:7a64fbb4069d 278 while (*p) {
screamer 0:7a64fbb4069d 279 dhcp_option_byte(dhcp, *p++);
screamer 0:7a64fbb4069d 280 }
screamer 0:7a64fbb4069d 281 }
screamer 0:7a64fbb4069d 282 #endif /* LWIP_NETIF_HOSTNAME */
screamer 0:7a64fbb4069d 283
screamer 0:7a64fbb4069d 284 dhcp_option_trailer(dhcp);
screamer 0:7a64fbb4069d 285 /* shrink the pbuf to the actual content length */
screamer 0:7a64fbb4069d 286 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
screamer 0:7a64fbb4069d 287
screamer 0:7a64fbb4069d 288 /* TODO: we really should bind to a specific local interface here
screamer 0:7a64fbb4069d 289 but we cannot specify an unconfigured netif as it is addressless */
screamer 0:7a64fbb4069d 290 /* send broadcast to any DHCP server */
screamer 0:7a64fbb4069d 291 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
screamer 0:7a64fbb4069d 292 /* reconnect to any (or to server here?!) */
screamer 0:7a64fbb4069d 293 udp_connect(dhcp->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
screamer 0:7a64fbb4069d 294 dhcp_delete_request(netif);
screamer 0:7a64fbb4069d 295 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_select: REQUESTING\n"));
screamer 0:7a64fbb4069d 296 dhcp_set_state(dhcp, DHCP_REQUESTING);
screamer 0:7a64fbb4069d 297 } else {
screamer 0:7a64fbb4069d 298 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 2, ("dhcp_select: could not allocate DHCP request\n"));
screamer 0:7a64fbb4069d 299 }
screamer 0:7a64fbb4069d 300 dhcp->tries++;
screamer 0:7a64fbb4069d 301 msecs = dhcp->tries < 4 ? dhcp->tries * 1000 : 4 * 1000;
screamer 0:7a64fbb4069d 302 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
screamer 0:7a64fbb4069d 303 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_select(): set request timeout %"U16_F" msecs\n", msecs));
screamer 0:7a64fbb4069d 304 return result;
screamer 0:7a64fbb4069d 305 }
screamer 0:7a64fbb4069d 306
screamer 0:7a64fbb4069d 307 /**
screamer 0:7a64fbb4069d 308 * The DHCP timer that checks for lease renewal/rebind timeouts.
screamer 0:7a64fbb4069d 309 *
screamer 0:7a64fbb4069d 310 */
screamer 0:7a64fbb4069d 311 void
screamer 0:7a64fbb4069d 312 dhcp_coarse_tmr()
screamer 0:7a64fbb4069d 313 {
screamer 0:7a64fbb4069d 314 struct netif *netif = netif_list;
screamer 0:7a64fbb4069d 315 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_coarse_tmr()\n"));
screamer 0:7a64fbb4069d 316 /* iterate through all network interfaces */
screamer 0:7a64fbb4069d 317 while (netif != NULL) {
screamer 0:7a64fbb4069d 318 /* only act on DHCP configured interfaces */
screamer 0:7a64fbb4069d 319 if (netif->dhcp != NULL) {
screamer 0:7a64fbb4069d 320 /* timer is active (non zero), and triggers (zeroes) now? */
screamer 0:7a64fbb4069d 321 if (netif->dhcp->t2_timeout-- == 1) {
screamer 0:7a64fbb4069d 322 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t2 timeout\n"));
screamer 0:7a64fbb4069d 323 /* this clients' rebind timeout triggered */
screamer 0:7a64fbb4069d 324 dhcp_t2_timeout(netif);
screamer 0:7a64fbb4069d 325 /* timer is active (non zero), and triggers (zeroes) now */
screamer 0:7a64fbb4069d 326 } else if (netif->dhcp->t1_timeout-- == 1) {
screamer 0:7a64fbb4069d 327 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t1 timeout\n"));
screamer 0:7a64fbb4069d 328 /* this clients' renewal timeout triggered */
screamer 0:7a64fbb4069d 329 dhcp_t1_timeout(netif);
screamer 0:7a64fbb4069d 330 }
screamer 0:7a64fbb4069d 331 }
screamer 0:7a64fbb4069d 332 /* proceed to next netif */
screamer 0:7a64fbb4069d 333 netif = netif->next;
screamer 0:7a64fbb4069d 334 }
screamer 0:7a64fbb4069d 335 }
screamer 0:7a64fbb4069d 336
screamer 0:7a64fbb4069d 337 /**
screamer 0:7a64fbb4069d 338 * DHCP transaction timeout handling
screamer 0:7a64fbb4069d 339 *
screamer 0:7a64fbb4069d 340 * A DHCP server is expected to respond within a short period of time.
screamer 0:7a64fbb4069d 341 * This timer checks whether an outstanding DHCP request is timed out.
screamer 0:7a64fbb4069d 342 *
screamer 0:7a64fbb4069d 343 */
screamer 0:7a64fbb4069d 344 void
screamer 0:7a64fbb4069d 345 dhcp_fine_tmr()
screamer 0:7a64fbb4069d 346 {
screamer 0:7a64fbb4069d 347 struct netif *netif = netif_list;
screamer 0:7a64fbb4069d 348 /* loop through netif's */
screamer 0:7a64fbb4069d 349 while (netif != NULL) {
screamer 0:7a64fbb4069d 350 /* only act on DHCP configured interfaces */
screamer 0:7a64fbb4069d 351 if (netif->dhcp != NULL) {
screamer 0:7a64fbb4069d 352 /* timer is active (non zero), and is about to trigger now */
screamer 0:7a64fbb4069d 353 if (netif->dhcp->request_timeout > 1) {
screamer 0:7a64fbb4069d 354 netif->dhcp->request_timeout--;
screamer 0:7a64fbb4069d 355 }
screamer 0:7a64fbb4069d 356 else if (netif->dhcp->request_timeout == 1) {
screamer 0:7a64fbb4069d 357 netif->dhcp->request_timeout--;
screamer 0:7a64fbb4069d 358 /* { netif->dhcp->request_timeout == 0 } */
screamer 0:7a64fbb4069d 359 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_fine_tmr(): request timeout\n"));
screamer 0:7a64fbb4069d 360 /* this clients' request timeout triggered */
screamer 0:7a64fbb4069d 361 dhcp_timeout(netif);
screamer 0:7a64fbb4069d 362 }
screamer 0:7a64fbb4069d 363 }
screamer 0:7a64fbb4069d 364 /* proceed to next network interface */
screamer 0:7a64fbb4069d 365 netif = netif->next;
screamer 0:7a64fbb4069d 366 }
screamer 0:7a64fbb4069d 367 }
screamer 0:7a64fbb4069d 368
screamer 0:7a64fbb4069d 369 /**
screamer 0:7a64fbb4069d 370 * A DHCP negotiation transaction, or ARP request, has timed out.
screamer 0:7a64fbb4069d 371 *
screamer 0:7a64fbb4069d 372 * The timer that was started with the DHCP or ARP request has
screamer 0:7a64fbb4069d 373 * timed out, indicating no response was received in time.
screamer 0:7a64fbb4069d 374 *
screamer 0:7a64fbb4069d 375 * @param netif the netif under DHCP control
screamer 0:7a64fbb4069d 376 */
screamer 0:7a64fbb4069d 377 static void
screamer 0:7a64fbb4069d 378 dhcp_timeout(struct netif *netif)
screamer 0:7a64fbb4069d 379 {
screamer 0:7a64fbb4069d 380 struct dhcp *dhcp = netif->dhcp;
screamer 0:7a64fbb4069d 381 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 3, ("dhcp_timeout()\n"));
screamer 0:7a64fbb4069d 382 /* back-off period has passed, or server selection timed out */
screamer 0:7a64fbb4069d 383 if ((dhcp->state == DHCP_BACKING_OFF) || (dhcp->state == DHCP_SELECTING)) {
screamer 0:7a64fbb4069d 384 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_timeout(): restarting discovery\n"));
screamer 0:7a64fbb4069d 385 dhcp_discover(netif);
screamer 0:7a64fbb4069d 386 /* receiving the requested lease timed out */
screamer 0:7a64fbb4069d 387 } else if (dhcp->state == DHCP_REQUESTING) {
screamer 0:7a64fbb4069d 388 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, DHCP request timed out\n"));
screamer 0:7a64fbb4069d 389 if (dhcp->tries <= 5) {
screamer 0:7a64fbb4069d 390 dhcp_select(netif);
screamer 0:7a64fbb4069d 391 } else {
screamer 0:7a64fbb4069d 392 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, releasing, restarting\n"));
screamer 0:7a64fbb4069d 393 dhcp_release(netif);
screamer 0:7a64fbb4069d 394 dhcp_discover(netif);
screamer 0:7a64fbb4069d 395 }
screamer 0:7a64fbb4069d 396 /* received no ARP reply for the offered address (which is good) */
screamer 0:7a64fbb4069d 397 } else if (dhcp->state == DHCP_CHECKING) {
screamer 0:7a64fbb4069d 398 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): CHECKING, ARP request timed out\n"));
screamer 0:7a64fbb4069d 399 if (dhcp->tries <= 1) {
screamer 0:7a64fbb4069d 400 dhcp_check(netif);
screamer 0:7a64fbb4069d 401 /* no ARP replies on the offered address,
screamer 0:7a64fbb4069d 402 looks like the IP address is indeed free */
screamer 0:7a64fbb4069d 403 } else {
screamer 0:7a64fbb4069d 404 /* bind the interface to the offered address */
screamer 0:7a64fbb4069d 405 dhcp_bind(netif);
screamer 0:7a64fbb4069d 406 }
screamer 0:7a64fbb4069d 407 }
screamer 0:7a64fbb4069d 408 /* did not get response to renew request? */
screamer 0:7a64fbb4069d 409 else if (dhcp->state == DHCP_RENEWING) {
screamer 0:7a64fbb4069d 410 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): RENEWING, DHCP request timed out\n"));
screamer 0:7a64fbb4069d 411 /* just retry renewal */
screamer 0:7a64fbb4069d 412 /* note that the rebind timer will eventually time-out if renew does not work */
screamer 0:7a64fbb4069d 413 dhcp_renew(netif);
screamer 0:7a64fbb4069d 414 /* did not get response to rebind request? */
screamer 0:7a64fbb4069d 415 } else if (dhcp->state == DHCP_REBINDING) {
screamer 0:7a64fbb4069d 416 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REBINDING, DHCP request timed out\n"));
screamer 0:7a64fbb4069d 417 if (dhcp->tries <= 8) {
screamer 0:7a64fbb4069d 418 dhcp_rebind(netif);
screamer 0:7a64fbb4069d 419 } else {
screamer 0:7a64fbb4069d 420 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): RELEASING, DISCOVERING\n"));
screamer 0:7a64fbb4069d 421 dhcp_release(netif);
screamer 0:7a64fbb4069d 422 dhcp_discover(netif);
screamer 0:7a64fbb4069d 423 }
screamer 0:7a64fbb4069d 424 }
screamer 0:7a64fbb4069d 425 }
screamer 0:7a64fbb4069d 426
screamer 0:7a64fbb4069d 427 /**
screamer 0:7a64fbb4069d 428 * The renewal period has timed out.
screamer 0:7a64fbb4069d 429 *
screamer 0:7a64fbb4069d 430 * @param netif the netif under DHCP control
screamer 0:7a64fbb4069d 431 */
screamer 0:7a64fbb4069d 432 static void
screamer 0:7a64fbb4069d 433 dhcp_t1_timeout(struct netif *netif)
screamer 0:7a64fbb4069d 434 {
screamer 0:7a64fbb4069d 435 struct dhcp *dhcp = netif->dhcp;
screamer 0:7a64fbb4069d 436 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_t1_timeout()\n"));
screamer 0:7a64fbb4069d 437 if ((dhcp->state == DHCP_REQUESTING) || (dhcp->state == DHCP_BOUND) || (dhcp->state == DHCP_RENEWING)) {
screamer 0:7a64fbb4069d 438 /* just retry to renew - note that the rebind timer (t2) will
screamer 0:7a64fbb4069d 439 * eventually time-out if renew tries fail. */
screamer 0:7a64fbb4069d 440 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_t1_timeout(): must renew\n"));
screamer 0:7a64fbb4069d 441 dhcp_renew(netif);
screamer 0:7a64fbb4069d 442 }
screamer 0:7a64fbb4069d 443 }
screamer 0:7a64fbb4069d 444
screamer 0:7a64fbb4069d 445 /**
screamer 0:7a64fbb4069d 446 * The rebind period has timed out.
screamer 0:7a64fbb4069d 447 *
screamer 0:7a64fbb4069d 448 * @param netif the netif under DHCP control
screamer 0:7a64fbb4069d 449 */
screamer 0:7a64fbb4069d 450 static void
screamer 0:7a64fbb4069d 451 dhcp_t2_timeout(struct netif *netif)
screamer 0:7a64fbb4069d 452 {
screamer 0:7a64fbb4069d 453 struct dhcp *dhcp = netif->dhcp;
screamer 0:7a64fbb4069d 454 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_t2_timeout()\n"));
screamer 0:7a64fbb4069d 455 if ((dhcp->state == DHCP_REQUESTING) || (dhcp->state == DHCP_BOUND) || (dhcp->state == DHCP_RENEWING)) {
screamer 0:7a64fbb4069d 456 /* just retry to rebind */
screamer 0:7a64fbb4069d 457 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_t2_timeout(): must rebind\n"));
screamer 0:7a64fbb4069d 458 dhcp_rebind(netif);
screamer 0:7a64fbb4069d 459 }
screamer 0:7a64fbb4069d 460 }
screamer 0:7a64fbb4069d 461
screamer 0:7a64fbb4069d 462 /**
screamer 0:7a64fbb4069d 463 * Handle a DHCP ACK packet
screamer 0:7a64fbb4069d 464 *
screamer 0:7a64fbb4069d 465 * @param netif the netif under DHCP control
screamer 0:7a64fbb4069d 466 */
screamer 0:7a64fbb4069d 467 static void
screamer 0:7a64fbb4069d 468 dhcp_handle_ack(struct netif *netif)
screamer 0:7a64fbb4069d 469 {
screamer 0:7a64fbb4069d 470 struct dhcp *dhcp = netif->dhcp;
screamer 0:7a64fbb4069d 471 u8_t *option_ptr;
screamer 0:7a64fbb4069d 472 /* clear options we might not get from the ACK */
screamer 0:7a64fbb4069d 473 dhcp->offered_sn_mask.addr = 0;
screamer 0:7a64fbb4069d 474 dhcp->offered_gw_addr.addr = 0;
screamer 0:7a64fbb4069d 475 dhcp->offered_bc_addr.addr = 0;
screamer 0:7a64fbb4069d 476
screamer 0:7a64fbb4069d 477 /* lease time given? */
screamer 0:7a64fbb4069d 478 option_ptr = dhcp_get_option_ptr(dhcp, DHCP_OPTION_LEASE_TIME);
screamer 0:7a64fbb4069d 479 if (option_ptr != NULL) {
screamer 0:7a64fbb4069d 480 /* remember offered lease time */
screamer 0:7a64fbb4069d 481 dhcp->offered_t0_lease = dhcp_get_option_long(option_ptr + 2);
screamer 0:7a64fbb4069d 482 }
screamer 0:7a64fbb4069d 483 /* renewal period given? */
screamer 0:7a64fbb4069d 484 option_ptr = dhcp_get_option_ptr(dhcp, DHCP_OPTION_T1);
screamer 0:7a64fbb4069d 485 if (option_ptr != NULL) {
screamer 0:7a64fbb4069d 486 /* remember given renewal period */
screamer 0:7a64fbb4069d 487 dhcp->offered_t1_renew = dhcp_get_option_long(option_ptr + 2);
screamer 0:7a64fbb4069d 488 } else {
screamer 0:7a64fbb4069d 489 /* calculate safe periods for renewal */
screamer 0:7a64fbb4069d 490 dhcp->offered_t1_renew = dhcp->offered_t0_lease / 2;
screamer 0:7a64fbb4069d 491 }
screamer 0:7a64fbb4069d 492
screamer 0:7a64fbb4069d 493 /* renewal period given? */
screamer 0:7a64fbb4069d 494 option_ptr = dhcp_get_option_ptr(dhcp, DHCP_OPTION_T2);
screamer 0:7a64fbb4069d 495 if (option_ptr != NULL) {
screamer 0:7a64fbb4069d 496 /* remember given rebind period */
screamer 0:7a64fbb4069d 497 dhcp->offered_t2_rebind = dhcp_get_option_long(option_ptr + 2);
screamer 0:7a64fbb4069d 498 } else {
screamer 0:7a64fbb4069d 499 /* calculate safe periods for rebinding */
screamer 0:7a64fbb4069d 500 dhcp->offered_t2_rebind = dhcp->offered_t0_lease;
screamer 0:7a64fbb4069d 501 }
screamer 0:7a64fbb4069d 502
screamer 0:7a64fbb4069d 503 /* (y)our internet address */
screamer 0:7a64fbb4069d 504 ip_addr_set(&dhcp->offered_ip_addr, &dhcp->msg_in->yiaddr);
screamer 0:7a64fbb4069d 505
screamer 0:7a64fbb4069d 506 /**
screamer 0:7a64fbb4069d 507 * Patch #1308
screamer 0:7a64fbb4069d 508 * TODO: we must check if the file field is not overloaded by DHCP options!
screamer 0:7a64fbb4069d 509 */
screamer 0:7a64fbb4069d 510 #if 0
screamer 0:7a64fbb4069d 511 /* boot server address */
screamer 0:7a64fbb4069d 512 ip_addr_set(&dhcp->offered_si_addr, &dhcp->msg_in->siaddr);
screamer 0:7a64fbb4069d 513 /* boot file name */
screamer 0:7a64fbb4069d 514 if (dhcp->msg_in->file[0]) {
screamer 0:7a64fbb4069d 515 dhcp->boot_file_name = mem_malloc(strlen(dhcp->msg_in->file) + 1);
screamer 0:7a64fbb4069d 516 strcpy(dhcp->boot_file_name, dhcp->msg_in->file);
screamer 0:7a64fbb4069d 517 }
screamer 0:7a64fbb4069d 518 #endif
screamer 0:7a64fbb4069d 519
screamer 0:7a64fbb4069d 520 /* subnet mask */
screamer 0:7a64fbb4069d 521 option_ptr = dhcp_get_option_ptr(dhcp, DHCP_OPTION_SUBNET_MASK);
screamer 0:7a64fbb4069d 522 /* subnet mask given? */
screamer 0:7a64fbb4069d 523 if (option_ptr != NULL) {
screamer 0:7a64fbb4069d 524 dhcp->offered_sn_mask.addr = htonl(dhcp_get_option_long(&option_ptr[2]));
screamer 0:7a64fbb4069d 525 }
screamer 0:7a64fbb4069d 526
screamer 0:7a64fbb4069d 527 /* gateway router */
screamer 0:7a64fbb4069d 528 option_ptr = dhcp_get_option_ptr(dhcp, DHCP_OPTION_ROUTER);
screamer 0:7a64fbb4069d 529 if (option_ptr != NULL) {
screamer 0:7a64fbb4069d 530 dhcp->offered_gw_addr.addr = htonl(dhcp_get_option_long(&option_ptr[2]));
screamer 0:7a64fbb4069d 531 }
screamer 0:7a64fbb4069d 532
screamer 0:7a64fbb4069d 533 /* broadcast address */
screamer 0:7a64fbb4069d 534 option_ptr = dhcp_get_option_ptr(dhcp, DHCP_OPTION_BROADCAST);
screamer 0:7a64fbb4069d 535 if (option_ptr != NULL) {
screamer 0:7a64fbb4069d 536 dhcp->offered_bc_addr.addr = htonl(dhcp_get_option_long(&option_ptr[2]));
screamer 0:7a64fbb4069d 537 }
screamer 0:7a64fbb4069d 538
screamer 0:7a64fbb4069d 539 /* DNS servers */
screamer 0:7a64fbb4069d 540 option_ptr = dhcp_get_option_ptr(dhcp, DHCP_OPTION_DNS_SERVER);
screamer 0:7a64fbb4069d 541 if (option_ptr != NULL) {
screamer 0:7a64fbb4069d 542 u8_t n;
screamer 0:7a64fbb4069d 543 dhcp->dns_count = dhcp_get_option_byte(&option_ptr[1]) / (u32_t)sizeof(struct ip_addr);
screamer 0:7a64fbb4069d 544 /* limit to at most DHCP_MAX_DNS DNS servers */
screamer 0:7a64fbb4069d 545 if (dhcp->dns_count > DHCP_MAX_DNS)
screamer 0:7a64fbb4069d 546 dhcp->dns_count = DHCP_MAX_DNS;
screamer 0:7a64fbb4069d 547 for (n = 0; n < dhcp->dns_count; n++) {
screamer 0:7a64fbb4069d 548 dhcp->offered_dns_addr[n].addr = htonl(dhcp_get_option_long(&option_ptr[2 + n * 4]));
screamer 0:7a64fbb4069d 549 #if LWIP_DNS
screamer 0:7a64fbb4069d 550 dns_setserver( n, (struct ip_addr *)(&(dhcp->offered_dns_addr[n].addr)));
screamer 0:7a64fbb4069d 551 #endif /* LWIP_DNS */
screamer 0:7a64fbb4069d 552 }
screamer 0:7a64fbb4069d 553 #if LWIP_DNS
screamer 0:7a64fbb4069d 554 dns_setserver( n, (struct ip_addr *)(&ip_addr_any));
screamer 0:7a64fbb4069d 555 #endif /* LWIP_DNS */
screamer 0:7a64fbb4069d 556 }
screamer 0:7a64fbb4069d 557 }
screamer 0:7a64fbb4069d 558
screamer 0:7a64fbb4069d 559 /**
screamer 0:7a64fbb4069d 560 * Start DHCP negotiation for a network interface.
screamer 0:7a64fbb4069d 561 *
screamer 0:7a64fbb4069d 562 * If no DHCP client instance was attached to this interface,
screamer 0:7a64fbb4069d 563 * a new client is created first. If a DHCP client instance
screamer 0:7a64fbb4069d 564 * was already present, it restarts negotiation.
screamer 0:7a64fbb4069d 565 *
screamer 0:7a64fbb4069d 566 * @param netif The lwIP network interface
screamer 0:7a64fbb4069d 567 * @return lwIP error code
screamer 0:7a64fbb4069d 568 * - ERR_OK - No error
screamer 0:7a64fbb4069d 569 * - ERR_MEM - Out of memory
screamer 0:7a64fbb4069d 570 */
screamer 0:7a64fbb4069d 571 err_t
screamer 0:7a64fbb4069d 572 dhcp_start(struct netif *netif)
screamer 0:7a64fbb4069d 573 {
screamer 0:7a64fbb4069d 574 struct dhcp *dhcp;
screamer 0:7a64fbb4069d 575 err_t result = ERR_OK;
screamer 0:7a64fbb4069d 576
screamer 0:7a64fbb4069d 577 LWIP_ERROR("netif != NULL", (netif != NULL), return ERR_ARG;);
screamer 0:7a64fbb4069d 578 dhcp = netif->dhcp;
screamer 0:7a64fbb4069d 579 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));
screamer 0:7a64fbb4069d 580 /* Remove the flag that says this netif is handled by DHCP,
screamer 0:7a64fbb4069d 581 it is set when we succeeded starting. */
screamer 0:7a64fbb4069d 582 netif->flags &= ~NETIF_FLAG_DHCP;
screamer 0:7a64fbb4069d 583
screamer 0:7a64fbb4069d 584 /* check MTU of the netif */
screamer 0:7a64fbb4069d 585 if (netif->mtu < DHCP_MAX_MSG_LEN_MIN_REQUIRED) {
screamer 0:7a64fbb4069d 586 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): Cannot use this netif with DHCP: MTU is too small\n"));
screamer 0:7a64fbb4069d 587 return ERR_MEM;
screamer 0:7a64fbb4069d 588 }
screamer 0:7a64fbb4069d 589
screamer 0:7a64fbb4069d 590 /* no DHCP client attached yet? */
screamer 0:7a64fbb4069d 591 if (dhcp == NULL) {
screamer 0:7a64fbb4069d 592 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): starting new DHCP client\n"));
screamer 0:7a64fbb4069d 593 dhcp = (struct dhcp *)mem_malloc(sizeof(struct dhcp)); // static_cast<struct dhcp *>(x)
screamer 0:7a64fbb4069d 594 if (dhcp == NULL) {
screamer 0:7a64fbb4069d 595 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): could not allocate dhcp\n"));
screamer 0:7a64fbb4069d 596 return ERR_MEM;
screamer 0:7a64fbb4069d 597 }
screamer 0:7a64fbb4069d 598 /* store this dhcp client in the netif */
screamer 0:7a64fbb4069d 599 netif->dhcp = dhcp;
screamer 0:7a64fbb4069d 600 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): allocated dhcp"));
screamer 0:7a64fbb4069d 601 /* already has DHCP client attached */
screamer 0:7a64fbb4069d 602 } else {
screamer 0:7a64fbb4069d 603 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 3, ("dhcp_start(): restarting DHCP configuration\n"));
screamer 0:7a64fbb4069d 604 if (dhcp->pcb != NULL) {
screamer 0:7a64fbb4069d 605 udp_remove(dhcp->pcb);
screamer 0:7a64fbb4069d 606 }
screamer 0:7a64fbb4069d 607 if (dhcp->p != NULL) {
screamer 0:7a64fbb4069d 608 pbuf_free(dhcp->p);
screamer 0:7a64fbb4069d 609 }
screamer 0:7a64fbb4069d 610 }
screamer 0:7a64fbb4069d 611
screamer 0:7a64fbb4069d 612 /* clear data structure */
screamer 0:7a64fbb4069d 613 memset(dhcp, 0, sizeof(struct dhcp));
screamer 0:7a64fbb4069d 614 /* allocate UDP PCB */
screamer 0:7a64fbb4069d 615 dhcp->pcb = udp_new();
screamer 0:7a64fbb4069d 616 if (dhcp->pcb == NULL) {
screamer 0:7a64fbb4069d 617 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): could not obtain pcb\n"));
screamer 0:7a64fbb4069d 618 mem_free((void *)dhcp);
screamer 0:7a64fbb4069d 619 netif->dhcp = dhcp = NULL;
screamer 0:7a64fbb4069d 620 return ERR_MEM;
screamer 0:7a64fbb4069d 621 }
screamer 0:7a64fbb4069d 622 /* set up local and remote port for the pcb */
screamer 0:7a64fbb4069d 623 udp_bind(dhcp->pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
screamer 0:7a64fbb4069d 624 udp_connect(dhcp->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
screamer 0:7a64fbb4069d 625 /* set up the recv callback and argument */
screamer 0:7a64fbb4069d 626 udp_recv(dhcp->pcb, dhcp_recv, netif);
screamer 0:7a64fbb4069d 627 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): starting DHCP configuration\n"));
screamer 0:7a64fbb4069d 628 /* (re)start the DHCP negotiation */
screamer 0:7a64fbb4069d 629 result = dhcp_discover(netif);
screamer 0:7a64fbb4069d 630 if (result != ERR_OK) {
screamer 0:7a64fbb4069d 631 /* free resources allocated above */
screamer 0:7a64fbb4069d 632 dhcp_stop(netif);
screamer 0:7a64fbb4069d 633 return ERR_MEM;
screamer 0:7a64fbb4069d 634 }
screamer 0:7a64fbb4069d 635 /* Set the flag that says this netif is handled by DHCP. */
screamer 0:7a64fbb4069d 636 netif->flags |= NETIF_FLAG_DHCP;
screamer 0:7a64fbb4069d 637 return result;
screamer 0:7a64fbb4069d 638 }
screamer 0:7a64fbb4069d 639
screamer 0:7a64fbb4069d 640 /**
screamer 0:7a64fbb4069d 641 * Inform a DHCP server of our manual configuration.
screamer 0:7a64fbb4069d 642 *
screamer 0:7a64fbb4069d 643 * This informs DHCP servers of our fixed IP address configuration
screamer 0:7a64fbb4069d 644 * by sending an INFORM message. It does not involve DHCP address
screamer 0:7a64fbb4069d 645 * configuration, it is just here to be nice to the network.
screamer 0:7a64fbb4069d 646 *
screamer 0:7a64fbb4069d 647 * @param netif The lwIP network interface
screamer 0:7a64fbb4069d 648 */
screamer 0:7a64fbb4069d 649 void
screamer 0:7a64fbb4069d 650 dhcp_inform(struct netif *netif)
screamer 0:7a64fbb4069d 651 {
screamer 0:7a64fbb4069d 652 struct dhcp *dhcp, *old_dhcp = netif->dhcp;
screamer 0:7a64fbb4069d 653 err_t result = ERR_OK;
screamer 0:7a64fbb4069d 654 dhcp = (struct dhcp *)mem_malloc(sizeof(struct dhcp)); // static_cast<struct dhcp *>(x)
screamer 0:7a64fbb4069d 655 if (dhcp == NULL) {
screamer 0:7a64fbb4069d 656 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 2, ("dhcp_inform(): could not allocate dhcp\n"));
screamer 0:7a64fbb4069d 657 return;
screamer 0:7a64fbb4069d 658 }
screamer 0:7a64fbb4069d 659 netif->dhcp = dhcp;
screamer 0:7a64fbb4069d 660 memset(dhcp, 0, sizeof(struct dhcp));
screamer 0:7a64fbb4069d 661
screamer 0:7a64fbb4069d 662 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_inform(): allocated dhcp\n"));
screamer 0:7a64fbb4069d 663 dhcp->pcb = udp_new();
screamer 0:7a64fbb4069d 664 if (dhcp->pcb == NULL) {
screamer 0:7a64fbb4069d 665 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 2, ("dhcp_inform(): could not obtain pcb"));
screamer 0:7a64fbb4069d 666 mem_free((void *)dhcp);
screamer 0:7a64fbb4069d 667 return;
screamer 0:7a64fbb4069d 668 }
screamer 0:7a64fbb4069d 669 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_inform(): created new udp pcb\n"));
screamer 0:7a64fbb4069d 670 /* create and initialize the DHCP message header */
screamer 0:7a64fbb4069d 671 result = dhcp_create_request(netif);
screamer 0:7a64fbb4069d 672 if (result == ERR_OK) {
screamer 0:7a64fbb4069d 673
screamer 0:7a64fbb4069d 674 dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
screamer 0:7a64fbb4069d 675 dhcp_option_byte(dhcp, DHCP_INFORM);
screamer 0:7a64fbb4069d 676
screamer 0:7a64fbb4069d 677 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
screamer 0:7a64fbb4069d 678 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
screamer 0:7a64fbb4069d 679
screamer 0:7a64fbb4069d 680 dhcp_option_trailer(dhcp);
screamer 0:7a64fbb4069d 681
screamer 0:7a64fbb4069d 682 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
screamer 0:7a64fbb4069d 683
screamer 0:7a64fbb4069d 684 udp_bind(dhcp->pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
screamer 0:7a64fbb4069d 685 udp_connect(dhcp->pcb, IP_ADDR_BROADCAST, DHCP_SERVER_PORT);
screamer 0:7a64fbb4069d 686 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_inform: INFORMING\n"));
screamer 0:7a64fbb4069d 687 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
screamer 0:7a64fbb4069d 688 udp_connect(dhcp->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
screamer 0:7a64fbb4069d 689 dhcp_delete_request(netif);
screamer 0:7a64fbb4069d 690 } else {
screamer 0:7a64fbb4069d 691 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 2, ("dhcp_inform: could not allocate DHCP request\n"));
screamer 0:7a64fbb4069d 692 }
screamer 0:7a64fbb4069d 693
screamer 0:7a64fbb4069d 694 if (dhcp->pcb != NULL) {
screamer 0:7a64fbb4069d 695 udp_remove(dhcp->pcb);
screamer 0:7a64fbb4069d 696 }
screamer 0:7a64fbb4069d 697 dhcp->pcb = NULL;
screamer 0:7a64fbb4069d 698 mem_free((void *)dhcp);
screamer 0:7a64fbb4069d 699 netif->dhcp = old_dhcp;
screamer 0:7a64fbb4069d 700 }
screamer 0:7a64fbb4069d 701
screamer 0:7a64fbb4069d 702 #if DHCP_DOES_ARP_CHECK
screamer 0:7a64fbb4069d 703 /**
screamer 0:7a64fbb4069d 704 * Match an ARP reply with the offered IP address.
screamer 0:7a64fbb4069d 705 *
screamer 0:7a64fbb4069d 706 * @param netif the network interface on which the reply was received
screamer 0:7a64fbb4069d 707 * @param addr The IP address we received a reply from
screamer 0:7a64fbb4069d 708 */
screamer 0:7a64fbb4069d 709 void dhcp_arp_reply(struct netif *netif, struct ip_addr *addr)
screamer 0:7a64fbb4069d 710 {
screamer 0:7a64fbb4069d 711 LWIP_ERROR("netif != NULL", (netif != NULL), return;);
screamer 0:7a64fbb4069d 712 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 3, ("dhcp_arp_reply()\n"));
screamer 0:7a64fbb4069d 713 /* is a DHCP client doing an ARP check? */
screamer 0:7a64fbb4069d 714 if ((netif->dhcp != NULL) && (netif->dhcp->state == DHCP_CHECKING)) {
screamer 0:7a64fbb4069d 715 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_arp_reply(): CHECKING, arp reply for 0x%08"X32_F"\n", addr->addr));
screamer 0:7a64fbb4069d 716 /* did a host respond with the address we
screamer 0:7a64fbb4069d 717 were offered by the DHCP server? */
screamer 0:7a64fbb4069d 718 if (ip_addr_cmp(addr, &netif->dhcp->offered_ip_addr)) {
screamer 0:7a64fbb4069d 719 /* we will not accept the offered address */
screamer 0:7a64fbb4069d 720 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1, ("dhcp_arp_reply(): arp reply matched with offered address, declining\n"));
screamer 0:7a64fbb4069d 721 dhcp_decline(netif);
screamer 0:7a64fbb4069d 722 }
screamer 0:7a64fbb4069d 723 }
screamer 0:7a64fbb4069d 724 }
screamer 0:7a64fbb4069d 725
screamer 0:7a64fbb4069d 726 /**
screamer 0:7a64fbb4069d 727 * Decline an offered lease.
screamer 0:7a64fbb4069d 728 *
screamer 0:7a64fbb4069d 729 * Tell the DHCP server we do not accept the offered address.
screamer 0:7a64fbb4069d 730 * One reason to decline the lease is when we find out the address
screamer 0:7a64fbb4069d 731 * is already in use by another host (through ARP).
screamer 0:7a64fbb4069d 732 *
screamer 0:7a64fbb4069d 733 * @param netif the netif under DHCP control
screamer 0:7a64fbb4069d 734 */
screamer 0:7a64fbb4069d 735 static err_t
screamer 0:7a64fbb4069d 736 dhcp_decline(struct netif *netif)
screamer 0:7a64fbb4069d 737 {
screamer 0:7a64fbb4069d 738 struct dhcp *dhcp = netif->dhcp;
screamer 0:7a64fbb4069d 739 err_t result = ERR_OK;
screamer 0:7a64fbb4069d 740 u16_t msecs;
screamer 0:7a64fbb4069d 741 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 3, ("dhcp_decline()\n"));
screamer 0:7a64fbb4069d 742 dhcp_set_state(dhcp, DHCP_BACKING_OFF);
screamer 0:7a64fbb4069d 743 /* create and initialize the DHCP message header */
screamer 0:7a64fbb4069d 744 result = dhcp_create_request(netif);
screamer 0:7a64fbb4069d 745 if (result == ERR_OK) {
screamer 0:7a64fbb4069d 746 dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
screamer 0:7a64fbb4069d 747 dhcp_option_byte(dhcp, DHCP_DECLINE);
screamer 0:7a64fbb4069d 748
screamer 0:7a64fbb4069d 749 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
screamer 0:7a64fbb4069d 750 dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
screamer 0:7a64fbb4069d 751
screamer 0:7a64fbb4069d 752 dhcp_option_trailer(dhcp);
screamer 0:7a64fbb4069d 753 /* resize pbuf to reflect true size of options */
screamer 0:7a64fbb4069d 754 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
screamer 0:7a64fbb4069d 755
screamer 0:7a64fbb4069d 756 /* @todo: should we really connect here? we are performing sendto() */
screamer 0:7a64fbb4069d 757 udp_connect(dhcp->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
screamer 0:7a64fbb4069d 758 /* per section 4.4.4, broadcast DECLINE messages */
screamer 0:7a64fbb4069d 759 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
screamer 0:7a64fbb4069d 760 dhcp_delete_request(netif);
screamer 0:7a64fbb4069d 761 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_decline: BACKING OFF\n"));
screamer 0:7a64fbb4069d 762 } else {
screamer 0:7a64fbb4069d 763 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 2, ("dhcp_decline: could not allocate DHCP request\n"));
screamer 0:7a64fbb4069d 764 }
screamer 0:7a64fbb4069d 765 dhcp->tries++;
screamer 0:7a64fbb4069d 766 msecs = 10*1000;
screamer 0:7a64fbb4069d 767 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
screamer 0:7a64fbb4069d 768 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_decline(): set request timeout %"U16_F" msecs\n", msecs));
screamer 0:7a64fbb4069d 769 return result;
screamer 0:7a64fbb4069d 770 }
screamer 0:7a64fbb4069d 771 #endif
screamer 0:7a64fbb4069d 772
screamer 0:7a64fbb4069d 773
screamer 0:7a64fbb4069d 774 /**
screamer 0:7a64fbb4069d 775 * Start the DHCP process, discover a DHCP server.
screamer 0:7a64fbb4069d 776 *
screamer 0:7a64fbb4069d 777 * @param netif the netif under DHCP control
screamer 0:7a64fbb4069d 778 */
screamer 0:7a64fbb4069d 779 static err_t
screamer 0:7a64fbb4069d 780 dhcp_discover(struct netif *netif)
screamer 0:7a64fbb4069d 781 {
screamer 0:7a64fbb4069d 782 struct dhcp *dhcp = netif->dhcp;
screamer 0:7a64fbb4069d 783 err_t result = ERR_OK;
screamer 0:7a64fbb4069d 784 u16_t msecs;
screamer 0:7a64fbb4069d 785 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 3, ("dhcp_discover()\n"));
screamer 0:7a64fbb4069d 786 ip_addr_set(&dhcp->offered_ip_addr, IP_ADDR_ANY);
screamer 0:7a64fbb4069d 787 /* create and initialize the DHCP message header */
screamer 0:7a64fbb4069d 788 result = dhcp_create_request(netif);
screamer 0:7a64fbb4069d 789 if (result == ERR_OK) {
screamer 0:7a64fbb4069d 790 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: making request\n"));
screamer 0:7a64fbb4069d 791 dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
screamer 0:7a64fbb4069d 792 dhcp_option_byte(dhcp, DHCP_DISCOVER);
screamer 0:7a64fbb4069d 793
screamer 0:7a64fbb4069d 794 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
screamer 0:7a64fbb4069d 795 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
screamer 0:7a64fbb4069d 796
screamer 0:7a64fbb4069d 797 dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);
screamer 0:7a64fbb4069d 798 dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
screamer 0:7a64fbb4069d 799 dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
screamer 0:7a64fbb4069d 800 dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
screamer 0:7a64fbb4069d 801 dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
screamer 0:7a64fbb4069d 802
screamer 0:7a64fbb4069d 803 dhcp_option_trailer(dhcp);
screamer 0:7a64fbb4069d 804
screamer 0:7a64fbb4069d 805 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: realloc()ing\n"));
screamer 0:7a64fbb4069d 806 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
screamer 0:7a64fbb4069d 807
screamer 0:7a64fbb4069d 808 udp_connect(dhcp->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
screamer 0:7a64fbb4069d 809 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: sendto(DISCOVER, IP_ADDR_BROADCAST, DHCP_SERVER_PORT)\n"));
screamer 0:7a64fbb4069d 810 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
screamer 0:7a64fbb4069d 811 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: deleting()ing\n"));
screamer 0:7a64fbb4069d 812 dhcp_delete_request(netif);
screamer 0:7a64fbb4069d 813 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_discover: SELECTING\n"));
screamer 0:7a64fbb4069d 814 dhcp_set_state(dhcp, DHCP_SELECTING);
screamer 0:7a64fbb4069d 815 } else {
screamer 0:7a64fbb4069d 816 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 2, ("dhcp_discover: could not allocate DHCP request\n"));
screamer 0:7a64fbb4069d 817 }
screamer 0:7a64fbb4069d 818 dhcp->tries++;
screamer 0:7a64fbb4069d 819 #if LWIP_DHCP_AUTOIP_COOP
screamer 0:7a64fbb4069d 820 /* that means we waited 57 seconds */
screamer 0:7a64fbb4069d 821 if(dhcp->tries >= 9 && dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_OFF) {
screamer 0:7a64fbb4069d 822 dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_ON;
screamer 0:7a64fbb4069d 823 autoip_start(netif);
screamer 0:7a64fbb4069d 824 }
screamer 0:7a64fbb4069d 825 #endif /* LWIP_DHCP_AUTOIP_COOP */
screamer 0:7a64fbb4069d 826 msecs = dhcp->tries < 4 ? (dhcp->tries + 1) * 1000 : 10 * 1000;
screamer 0:7a64fbb4069d 827 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
screamer 0:7a64fbb4069d 828 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_discover(): set request timeout %"U16_F" msecs\n", msecs));
screamer 0:7a64fbb4069d 829 return result;
screamer 0:7a64fbb4069d 830 }
screamer 0:7a64fbb4069d 831
screamer 0:7a64fbb4069d 832
screamer 0:7a64fbb4069d 833 /**
screamer 0:7a64fbb4069d 834 * Bind the interface to the offered IP address.
screamer 0:7a64fbb4069d 835 *
screamer 0:7a64fbb4069d 836 * @param netif network interface to bind to the offered address
screamer 0:7a64fbb4069d 837 */
screamer 0:7a64fbb4069d 838 static void
screamer 0:7a64fbb4069d 839 dhcp_bind(struct netif *netif)
screamer 0:7a64fbb4069d 840 {
screamer 0:7a64fbb4069d 841 u32_t timeout;
screamer 0:7a64fbb4069d 842 struct dhcp *dhcp;
screamer 0:7a64fbb4069d 843 struct ip_addr sn_mask, gw_addr;
screamer 0:7a64fbb4069d 844 LWIP_ERROR("dhcp_bind: netif != NULL", (netif != NULL), return;);
screamer 0:7a64fbb4069d 845 dhcp = netif->dhcp;
screamer 0:7a64fbb4069d 846 LWIP_ERROR("dhcp_bind: dhcp != NULL", (dhcp != NULL), return;);
screamer 0:7a64fbb4069d 847 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 3, ("dhcp_bind(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
screamer 0:7a64fbb4069d 848
screamer 0:7a64fbb4069d 849 /* temporary DHCP lease? */
screamer 0:7a64fbb4069d 850 if (dhcp->offered_t1_renew != 0xffffffffUL) {
screamer 0:7a64fbb4069d 851 /* set renewal period timer */
screamer 0:7a64fbb4069d 852 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(): t1 renewal timer %"U32_F" secs\n", dhcp->offered_t1_renew));
screamer 0:7a64fbb4069d 853 timeout = (dhcp->offered_t1_renew + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
screamer 0:7a64fbb4069d 854 if(timeout > 0xffff) {
screamer 0:7a64fbb4069d 855 timeout = 0xffff;
screamer 0:7a64fbb4069d 856 }
screamer 0:7a64fbb4069d 857 dhcp->t1_timeout = (u16_t)timeout;
screamer 0:7a64fbb4069d 858 if (dhcp->t1_timeout == 0) {
screamer 0:7a64fbb4069d 859 dhcp->t1_timeout = 1;
screamer 0:7a64fbb4069d 860 }
screamer 0:7a64fbb4069d 861 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_bind(): set request timeout %"U32_F" msecs\n", dhcp->offered_t1_renew*1000));
screamer 0:7a64fbb4069d 862 }
screamer 0:7a64fbb4069d 863 /* set renewal period timer */
screamer 0:7a64fbb4069d 864 if (dhcp->offered_t2_rebind != 0xffffffffUL) {
screamer 0:7a64fbb4069d 865 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(): t2 rebind timer %"U32_F" secs\n", dhcp->offered_t2_rebind));
screamer 0:7a64fbb4069d 866 timeout = (dhcp->offered_t2_rebind + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
screamer 0:7a64fbb4069d 867 if(timeout > 0xffff) {
screamer 0:7a64fbb4069d 868 timeout = 0xffff;
screamer 0:7a64fbb4069d 869 }
screamer 0:7a64fbb4069d 870 dhcp->t2_timeout = (u16_t)timeout;
screamer 0:7a64fbb4069d 871 if (dhcp->t2_timeout == 0) {
screamer 0:7a64fbb4069d 872 dhcp->t2_timeout = 1;
screamer 0:7a64fbb4069d 873 }
screamer 0:7a64fbb4069d 874 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_bind(): set request timeout %"U32_F" msecs\n", dhcp->offered_t2_rebind*1000));
screamer 0:7a64fbb4069d 875 }
screamer 0:7a64fbb4069d 876 /* copy offered network mask */
screamer 0:7a64fbb4069d 877 ip_addr_set(&sn_mask, &dhcp->offered_sn_mask);
screamer 0:7a64fbb4069d 878
screamer 0:7a64fbb4069d 879 /* subnet mask not given? */
screamer 0:7a64fbb4069d 880 /* TODO: this is not a valid check. what if the network mask is 0? */
screamer 0:7a64fbb4069d 881 if (sn_mask.addr == 0) {
screamer 0:7a64fbb4069d 882 /* choose a safe subnet mask given the network class */
screamer 0:7a64fbb4069d 883 u8_t first_octet = ip4_addr1(&sn_mask);
screamer 0:7a64fbb4069d 884 if (first_octet <= 127) {
screamer 0:7a64fbb4069d 885 sn_mask.addr = htonl(0xff000000);
screamer 0:7a64fbb4069d 886 } else if (first_octet >= 192) {
screamer 0:7a64fbb4069d 887 sn_mask.addr = htonl(0xffffff00);
screamer 0:7a64fbb4069d 888 } else {
screamer 0:7a64fbb4069d 889 sn_mask.addr = htonl(0xffff0000);
screamer 0:7a64fbb4069d 890 }
screamer 0:7a64fbb4069d 891 }
screamer 0:7a64fbb4069d 892
screamer 0:7a64fbb4069d 893 ip_addr_set(&gw_addr, &dhcp->offered_gw_addr);
screamer 0:7a64fbb4069d 894 /* gateway address not given? */
screamer 0:7a64fbb4069d 895 if (gw_addr.addr == 0) {
screamer 0:7a64fbb4069d 896 /* copy network address */
screamer 0:7a64fbb4069d 897 gw_addr.addr = (dhcp->offered_ip_addr.addr & sn_mask.addr);
screamer 0:7a64fbb4069d 898 /* use first host address on network as gateway */
screamer 0:7a64fbb4069d 899 gw_addr.addr |= htonl(0x00000001);
screamer 0:7a64fbb4069d 900 }
screamer 0:7a64fbb4069d 901
screamer 0:7a64fbb4069d 902 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): IP: 0x%08"X32_F"\n", dhcp->offered_ip_addr.addr));
screamer 0:7a64fbb4069d 903 netif_set_ipaddr(netif, &dhcp->offered_ip_addr);
screamer 0:7a64fbb4069d 904 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): SN: 0x%08"X32_F"\n", sn_mask.addr));
screamer 0:7a64fbb4069d 905 netif_set_netmask(netif, &sn_mask);
screamer 0:7a64fbb4069d 906 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): GW: 0x%08"X32_F"\n", gw_addr.addr));
screamer 0:7a64fbb4069d 907 netif_set_gw(netif, &gw_addr);
screamer 0:7a64fbb4069d 908 /* bring the interface up */
screamer 0:7a64fbb4069d 909 netif_set_up(netif);
screamer 0:7a64fbb4069d 910 /* netif is now bound to DHCP leased address */
screamer 0:7a64fbb4069d 911 dhcp_set_state(dhcp, DHCP_BOUND);
screamer 0:7a64fbb4069d 912 }
screamer 0:7a64fbb4069d 913
screamer 0:7a64fbb4069d 914 /**
screamer 0:7a64fbb4069d 915 * Renew an existing DHCP lease at the involved DHCP server.
screamer 0:7a64fbb4069d 916 *
screamer 0:7a64fbb4069d 917 * @param netif network interface which must renew its lease
screamer 0:7a64fbb4069d 918 */
screamer 0:7a64fbb4069d 919 err_t
screamer 0:7a64fbb4069d 920 dhcp_renew(struct netif *netif)
screamer 0:7a64fbb4069d 921 {
screamer 0:7a64fbb4069d 922 struct dhcp *dhcp = netif->dhcp;
screamer 0:7a64fbb4069d 923 err_t result;
screamer 0:7a64fbb4069d 924 u16_t msecs;
screamer 0:7a64fbb4069d 925 #if LWIP_NETIF_HOSTNAME
screamer 0:7a64fbb4069d 926 const char *p;
screamer 0:7a64fbb4069d 927 #endif /* LWIP_NETIF_HOSTNAME */
screamer 0:7a64fbb4069d 928 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 3, ("dhcp_renew()\n"));
screamer 0:7a64fbb4069d 929 dhcp_set_state(dhcp, DHCP_RENEWING);
screamer 0:7a64fbb4069d 930
screamer 0:7a64fbb4069d 931 /* create and initialize the DHCP message header */
screamer 0:7a64fbb4069d 932 result = dhcp_create_request(netif);
screamer 0:7a64fbb4069d 933 if (result == ERR_OK) {
screamer 0:7a64fbb4069d 934
screamer 0:7a64fbb4069d 935 dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
screamer 0:7a64fbb4069d 936 dhcp_option_byte(dhcp, DHCP_REQUEST);
screamer 0:7a64fbb4069d 937
screamer 0:7a64fbb4069d 938 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
screamer 0:7a64fbb4069d 939 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
screamer 0:7a64fbb4069d 940
screamer 0:7a64fbb4069d 941 #if LWIP_NETIF_HOSTNAME
screamer 0:7a64fbb4069d 942 p = (const char*)netif->hostname;
screamer 0:7a64fbb4069d 943 if (p != NULL) {
screamer 0:7a64fbb4069d 944 dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, strlen(p));
screamer 0:7a64fbb4069d 945 while (*p) {
screamer 0:7a64fbb4069d 946 dhcp_option_byte(dhcp, *p++);
screamer 0:7a64fbb4069d 947 }
screamer 0:7a64fbb4069d 948 }
screamer 0:7a64fbb4069d 949 #endif /* LWIP_NETIF_HOSTNAME */
screamer 0:7a64fbb4069d 950
screamer 0:7a64fbb4069d 951 #if 0
screamer 0:7a64fbb4069d 952 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
screamer 0:7a64fbb4069d 953 dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
screamer 0:7a64fbb4069d 954 #endif
screamer 0:7a64fbb4069d 955
screamer 0:7a64fbb4069d 956 #if 0
screamer 0:7a64fbb4069d 957 dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
screamer 0:7a64fbb4069d 958 dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
screamer 0:7a64fbb4069d 959 #endif
screamer 0:7a64fbb4069d 960 /* append DHCP message trailer */
screamer 0:7a64fbb4069d 961 dhcp_option_trailer(dhcp);
screamer 0:7a64fbb4069d 962
screamer 0:7a64fbb4069d 963 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
screamer 0:7a64fbb4069d 964
screamer 0:7a64fbb4069d 965 udp_connect(dhcp->pcb, &dhcp->server_ip_addr, DHCP_SERVER_PORT);
screamer 0:7a64fbb4069d 966 udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
screamer 0:7a64fbb4069d 967 dhcp_delete_request(netif);
screamer 0:7a64fbb4069d 968
screamer 0:7a64fbb4069d 969 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_renew: RENEWING\n"));
screamer 0:7a64fbb4069d 970 } else {
screamer 0:7a64fbb4069d 971 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 2, ("dhcp_renew: could not allocate DHCP request\n"));
screamer 0:7a64fbb4069d 972 }
screamer 0:7a64fbb4069d 973 dhcp->tries++;
screamer 0:7a64fbb4069d 974 /* back-off on retries, but to a maximum of 20 seconds */
screamer 0:7a64fbb4069d 975 msecs = dhcp->tries < 10 ? dhcp->tries * 2000 : 20 * 1000;
screamer 0:7a64fbb4069d 976 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
screamer 0:7a64fbb4069d 977 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_renew(): set request timeout %"U16_F" msecs\n", msecs));
screamer 0:7a64fbb4069d 978 return result;
screamer 0:7a64fbb4069d 979 }
screamer 0:7a64fbb4069d 980
screamer 0:7a64fbb4069d 981 /**
screamer 0:7a64fbb4069d 982 * Rebind with a DHCP server for an existing DHCP lease.
screamer 0:7a64fbb4069d 983 *
screamer 0:7a64fbb4069d 984 * @param netif network interface which must rebind with a DHCP server
screamer 0:7a64fbb4069d 985 */
screamer 0:7a64fbb4069d 986 static err_t
screamer 0:7a64fbb4069d 987 dhcp_rebind(struct netif *netif)
screamer 0:7a64fbb4069d 988 {
screamer 0:7a64fbb4069d 989 struct dhcp *dhcp = netif->dhcp;
screamer 0:7a64fbb4069d 990 err_t result;
screamer 0:7a64fbb4069d 991 u16_t msecs;
screamer 0:7a64fbb4069d 992 #if LWIP_NETIF_HOSTNAME
screamer 0:7a64fbb4069d 993 const char *p;
screamer 0:7a64fbb4069d 994 #endif /* LWIP_NETIF_HOSTNAME */
screamer 0:7a64fbb4069d 995 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind()\n"));
screamer 0:7a64fbb4069d 996 dhcp_set_state(dhcp, DHCP_REBINDING);
screamer 0:7a64fbb4069d 997
screamer 0:7a64fbb4069d 998 /* create and initialize the DHCP message header */
screamer 0:7a64fbb4069d 999 result = dhcp_create_request(netif);
screamer 0:7a64fbb4069d 1000 if (result == ERR_OK) {
screamer 0:7a64fbb4069d 1001
screamer 0:7a64fbb4069d 1002 dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
screamer 0:7a64fbb4069d 1003 dhcp_option_byte(dhcp, DHCP_REQUEST);
screamer 0:7a64fbb4069d 1004
screamer 0:7a64fbb4069d 1005 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
screamer 0:7a64fbb4069d 1006 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
screamer 0:7a64fbb4069d 1007
screamer 0:7a64fbb4069d 1008 #if LWIP_NETIF_HOSTNAME
screamer 0:7a64fbb4069d 1009 p = (const char*)netif->hostname;
screamer 0:7a64fbb4069d 1010 if (p != NULL) {
screamer 0:7a64fbb4069d 1011 dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, strlen(p));
screamer 0:7a64fbb4069d 1012 while (*p) {
screamer 0:7a64fbb4069d 1013 dhcp_option_byte(dhcp, *p++);
screamer 0:7a64fbb4069d 1014 }
screamer 0:7a64fbb4069d 1015 }
screamer 0:7a64fbb4069d 1016 #endif /* LWIP_NETIF_HOSTNAME */
screamer 0:7a64fbb4069d 1017
screamer 0:7a64fbb4069d 1018 #if 0
screamer 0:7a64fbb4069d 1019 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
screamer 0:7a64fbb4069d 1020 dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
screamer 0:7a64fbb4069d 1021
screamer 0:7a64fbb4069d 1022 dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
screamer 0:7a64fbb4069d 1023 dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
screamer 0:7a64fbb4069d 1024 #endif
screamer 0:7a64fbb4069d 1025
screamer 0:7a64fbb4069d 1026 dhcp_option_trailer(dhcp);
screamer 0:7a64fbb4069d 1027
screamer 0:7a64fbb4069d 1028 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
screamer 0:7a64fbb4069d 1029
screamer 0:7a64fbb4069d 1030 /* broadcast to server */
screamer 0:7a64fbb4069d 1031 udp_connect(dhcp->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
screamer 0:7a64fbb4069d 1032 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
screamer 0:7a64fbb4069d 1033 dhcp_delete_request(netif);
screamer 0:7a64fbb4069d 1034 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind: REBINDING\n"));
screamer 0:7a64fbb4069d 1035 } else {
screamer 0:7a64fbb4069d 1036 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 2, ("dhcp_rebind: could not allocate DHCP request\n"));
screamer 0:7a64fbb4069d 1037 }
screamer 0:7a64fbb4069d 1038 dhcp->tries++;
screamer 0:7a64fbb4069d 1039 msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
screamer 0:7a64fbb4069d 1040 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
screamer 0:7a64fbb4069d 1041 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind(): set request timeout %"U16_F" msecs\n", msecs));
screamer 0:7a64fbb4069d 1042 return result;
screamer 0:7a64fbb4069d 1043 }
screamer 0:7a64fbb4069d 1044
screamer 0:7a64fbb4069d 1045 /**
screamer 0:7a64fbb4069d 1046 * Release a DHCP lease.
screamer 0:7a64fbb4069d 1047 *
screamer 0:7a64fbb4069d 1048 * @param netif network interface which must release its lease
screamer 0:7a64fbb4069d 1049 */
screamer 0:7a64fbb4069d 1050 err_t
screamer 0:7a64fbb4069d 1051 dhcp_release(struct netif *netif)
screamer 0:7a64fbb4069d 1052 {
screamer 0:7a64fbb4069d 1053 struct dhcp *dhcp = netif->dhcp;
screamer 0:7a64fbb4069d 1054 err_t result;
screamer 0:7a64fbb4069d 1055 u16_t msecs;
screamer 0:7a64fbb4069d 1056 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 3, ("dhcp_release()\n"));
screamer 0:7a64fbb4069d 1057
screamer 0:7a64fbb4069d 1058 /* idle DHCP client */
screamer 0:7a64fbb4069d 1059 dhcp_set_state(dhcp, DHCP_OFF);
screamer 0:7a64fbb4069d 1060 /* clean old DHCP offer */
screamer 0:7a64fbb4069d 1061 dhcp->server_ip_addr.addr = 0;
screamer 0:7a64fbb4069d 1062 dhcp->offered_ip_addr.addr = dhcp->offered_sn_mask.addr = 0;
screamer 0:7a64fbb4069d 1063 dhcp->offered_gw_addr.addr = dhcp->offered_bc_addr.addr = 0;
screamer 0:7a64fbb4069d 1064 dhcp->offered_t0_lease = dhcp->offered_t1_renew = dhcp->offered_t2_rebind = 0;
screamer 0:7a64fbb4069d 1065 dhcp->dns_count = 0;
screamer 0:7a64fbb4069d 1066
screamer 0:7a64fbb4069d 1067 /* create and initialize the DHCP message header */
screamer 0:7a64fbb4069d 1068 result = dhcp_create_request(netif);
screamer 0:7a64fbb4069d 1069 if (result == ERR_OK) {
screamer 0:7a64fbb4069d 1070 dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
screamer 0:7a64fbb4069d 1071 dhcp_option_byte(dhcp, DHCP_RELEASE);
screamer 0:7a64fbb4069d 1072
screamer 0:7a64fbb4069d 1073 dhcp_option_trailer(dhcp);
screamer 0:7a64fbb4069d 1074
screamer 0:7a64fbb4069d 1075 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
screamer 0:7a64fbb4069d 1076
screamer 0:7a64fbb4069d 1077 udp_connect(dhcp->pcb, &dhcp->server_ip_addr, DHCP_SERVER_PORT);
screamer 0:7a64fbb4069d 1078 udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
screamer 0:7a64fbb4069d 1079 dhcp_delete_request(netif);
screamer 0:7a64fbb4069d 1080 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_release: RELEASED, DHCP_OFF\n"));
screamer 0:7a64fbb4069d 1081 } else {
screamer 0:7a64fbb4069d 1082 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 2, ("dhcp_release: could not allocate DHCP request\n"));
screamer 0:7a64fbb4069d 1083 }
screamer 0:7a64fbb4069d 1084 dhcp->tries++;
screamer 0:7a64fbb4069d 1085 msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
screamer 0:7a64fbb4069d 1086 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
screamer 0:7a64fbb4069d 1087 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_release(): set request timeout %"U16_F" msecs\n", msecs));
screamer 0:7a64fbb4069d 1088 /* bring the interface down */
screamer 0:7a64fbb4069d 1089 netif_set_down(netif);
screamer 0:7a64fbb4069d 1090 /* remove IP address from interface */
screamer 0:7a64fbb4069d 1091 netif_set_ipaddr(netif, IP_ADDR_ANY);
screamer 0:7a64fbb4069d 1092 netif_set_gw(netif, IP_ADDR_ANY);
screamer 0:7a64fbb4069d 1093 netif_set_netmask(netif, IP_ADDR_ANY);
screamer 0:7a64fbb4069d 1094
screamer 0:7a64fbb4069d 1095 /* TODO: netif_down(netif); */
screamer 0:7a64fbb4069d 1096 return result;
screamer 0:7a64fbb4069d 1097 }
screamer 0:7a64fbb4069d 1098
screamer 0:7a64fbb4069d 1099 /**
screamer 0:7a64fbb4069d 1100 * Remove the DHCP client from the interface.
screamer 0:7a64fbb4069d 1101 *
screamer 0:7a64fbb4069d 1102 * @param netif The network interface to stop DHCP on
screamer 0:7a64fbb4069d 1103 */
screamer 0:7a64fbb4069d 1104 void
screamer 0:7a64fbb4069d 1105 dhcp_stop(struct netif *netif)
screamer 0:7a64fbb4069d 1106 {
screamer 0:7a64fbb4069d 1107 struct dhcp *dhcp = netif->dhcp;
screamer 0:7a64fbb4069d 1108 LWIP_ERROR("dhcp_stop: netif != NULL", (netif != NULL), return;);
screamer 0:7a64fbb4069d 1109 /* Remove the flag that says this netif is handled by DHCP. */
screamer 0:7a64fbb4069d 1110 netif->flags &= ~NETIF_FLAG_DHCP;
screamer 0:7a64fbb4069d 1111
screamer 0:7a64fbb4069d 1112 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 3, ("dhcp_stop()\n"));
screamer 0:7a64fbb4069d 1113 /* netif is DHCP configured? */
screamer 0:7a64fbb4069d 1114 if (dhcp != NULL) {
screamer 0:7a64fbb4069d 1115 if (dhcp->pcb != NULL) {
screamer 0:7a64fbb4069d 1116 udp_remove(dhcp->pcb);
screamer 0:7a64fbb4069d 1117 dhcp->pcb = NULL;
screamer 0:7a64fbb4069d 1118 }
screamer 0:7a64fbb4069d 1119 if (dhcp->p != NULL) {
screamer 0:7a64fbb4069d 1120 pbuf_free(dhcp->p);
screamer 0:7a64fbb4069d 1121 dhcp->p = NULL;
screamer 0:7a64fbb4069d 1122 }
screamer 0:7a64fbb4069d 1123 /* free unfolded reply */
screamer 0:7a64fbb4069d 1124 dhcp_free_reply(dhcp);
screamer 0:7a64fbb4069d 1125 mem_free((void *)dhcp);
screamer 0:7a64fbb4069d 1126 netif->dhcp = NULL;
screamer 0:7a64fbb4069d 1127 }
screamer 0:7a64fbb4069d 1128 }
screamer 0:7a64fbb4069d 1129
screamer 0:7a64fbb4069d 1130 /*
screamer 0:7a64fbb4069d 1131 * Set the DHCP state of a DHCP client.
screamer 0:7a64fbb4069d 1132 *
screamer 0:7a64fbb4069d 1133 * If the state changed, reset the number of tries.
screamer 0:7a64fbb4069d 1134 *
screamer 0:7a64fbb4069d 1135 * TODO: we might also want to reset the timeout here?
screamer 0:7a64fbb4069d 1136 */
screamer 0:7a64fbb4069d 1137 static void
screamer 0:7a64fbb4069d 1138 dhcp_set_state(struct dhcp *dhcp, u8_t new_state)
screamer 0:7a64fbb4069d 1139 {
screamer 0:7a64fbb4069d 1140 if (new_state != dhcp->state) {
screamer 0:7a64fbb4069d 1141 dhcp->state = new_state;
screamer 0:7a64fbb4069d 1142 dhcp->tries = 0;
screamer 0:7a64fbb4069d 1143 }
screamer 0:7a64fbb4069d 1144 }
screamer 0:7a64fbb4069d 1145
screamer 0:7a64fbb4069d 1146 /*
screamer 0:7a64fbb4069d 1147 * Concatenate an option type and length field to the outgoing
screamer 0:7a64fbb4069d 1148 * DHCP message.
screamer 0:7a64fbb4069d 1149 *
screamer 0:7a64fbb4069d 1150 */
screamer 0:7a64fbb4069d 1151 static void
screamer 0:7a64fbb4069d 1152 dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len)
screamer 0:7a64fbb4069d 1153 {
screamer 0:7a64fbb4069d 1154 LWIP_ASSERT("dhcp_option: dhcp->options_out_len + 2 + option_len <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U + option_len <= DHCP_OPTIONS_LEN);
screamer 0:7a64fbb4069d 1155 dhcp->msg_out->options[dhcp->options_out_len++] = option_type;
screamer 0:7a64fbb4069d 1156 dhcp->msg_out->options[dhcp->options_out_len++] = option_len;
screamer 0:7a64fbb4069d 1157 }
screamer 0:7a64fbb4069d 1158 /*
screamer 0:7a64fbb4069d 1159 * Concatenate a single byte to the outgoing DHCP message.
screamer 0:7a64fbb4069d 1160 *
screamer 0:7a64fbb4069d 1161 */
screamer 0:7a64fbb4069d 1162 static void
screamer 0:7a64fbb4069d 1163 dhcp_option_byte(struct dhcp *dhcp, u8_t value)
screamer 0:7a64fbb4069d 1164 {
screamer 0:7a64fbb4069d 1165 LWIP_ASSERT("dhcp_option_byte: dhcp->options_out_len < DHCP_OPTIONS_LEN", dhcp->options_out_len < DHCP_OPTIONS_LEN);
screamer 0:7a64fbb4069d 1166 dhcp->msg_out->options[dhcp->options_out_len++] = value;
screamer 0:7a64fbb4069d 1167 }
screamer 0:7a64fbb4069d 1168
screamer 0:7a64fbb4069d 1169 static void
screamer 0:7a64fbb4069d 1170 dhcp_option_short(struct dhcp *dhcp, u16_t value)
screamer 0:7a64fbb4069d 1171 {
screamer 0:7a64fbb4069d 1172 LWIP_ASSERT("dhcp_option_short: dhcp->options_out_len + 2 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U <= DHCP_OPTIONS_LEN);
screamer 0:7a64fbb4069d 1173 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff00U) >> 8);
screamer 0:7a64fbb4069d 1174 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t) (value & 0x00ffU);
screamer 0:7a64fbb4069d 1175 }
screamer 0:7a64fbb4069d 1176
screamer 0:7a64fbb4069d 1177 static void
screamer 0:7a64fbb4069d 1178 dhcp_option_long(struct dhcp *dhcp, u32_t value)
screamer 0:7a64fbb4069d 1179 {
screamer 0:7a64fbb4069d 1180 LWIP_ASSERT("dhcp_option_long: dhcp->options_out_len + 4 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 4U <= DHCP_OPTIONS_LEN);
screamer 0:7a64fbb4069d 1181 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff000000UL) >> 24);
screamer 0:7a64fbb4069d 1182 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x00ff0000UL) >> 16);
screamer 0:7a64fbb4069d 1183 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x0000ff00UL) >> 8);
screamer 0:7a64fbb4069d 1184 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x000000ffUL));
screamer 0:7a64fbb4069d 1185 }
screamer 0:7a64fbb4069d 1186
screamer 0:7a64fbb4069d 1187 /**
screamer 0:7a64fbb4069d 1188 * Extract the DHCP message and the DHCP options.
screamer 0:7a64fbb4069d 1189 *
screamer 0:7a64fbb4069d 1190 * Extract the DHCP message and the DHCP options, each into a contiguous
screamer 0:7a64fbb4069d 1191 * piece of memory. As a DHCP message is variable sized by its options,
screamer 0:7a64fbb4069d 1192 * and also allows overriding some fields for options, the easy approach
screamer 0:7a64fbb4069d 1193 * is to first unfold the options into a conitguous piece of memory, and
screamer 0:7a64fbb4069d 1194 * use that further on.
screamer 0:7a64fbb4069d 1195 *
screamer 0:7a64fbb4069d 1196 */
screamer 0:7a64fbb4069d 1197 static err_t
screamer 0:7a64fbb4069d 1198 dhcp_unfold_reply(struct dhcp *dhcp)
screamer 0:7a64fbb4069d 1199 {
screamer 0:7a64fbb4069d 1200 u16_t ret;
screamer 0:7a64fbb4069d 1201 LWIP_ERROR("dhcp != NULL", (dhcp != NULL), return ERR_ARG;);
screamer 0:7a64fbb4069d 1202 LWIP_ERROR("dhcp->p != NULL", (dhcp->p != NULL), return ERR_VAL;);
screamer 0:7a64fbb4069d 1203 /* free any left-overs from previous unfolds */
screamer 0:7a64fbb4069d 1204 dhcp_free_reply(dhcp);
screamer 0:7a64fbb4069d 1205 /* options present? */
screamer 0:7a64fbb4069d 1206 if (dhcp->p->tot_len > (sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN)) {
screamer 0:7a64fbb4069d 1207 dhcp->options_in_len = dhcp->p->tot_len - (sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN);
screamer 0:7a64fbb4069d 1208 dhcp->options_in = (struct dhcp_msg *)mem_malloc(dhcp->options_in_len); // static_cast<struct dhcp_msg *>(x)
screamer 0:7a64fbb4069d 1209 if (dhcp->options_in == NULL) {
screamer 0:7a64fbb4069d 1210 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 2, ("dhcp_unfold_reply(): could not allocate dhcp->options\n"));
screamer 0:7a64fbb4069d 1211 return ERR_MEM;
screamer 0:7a64fbb4069d 1212 }
screamer 0:7a64fbb4069d 1213 }
screamer 0:7a64fbb4069d 1214 dhcp->msg_in = (struct dhcp_msg *)mem_malloc(sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN); // static_cast<struct dhcp_msg *>(x)
screamer 0:7a64fbb4069d 1215 if (dhcp->msg_in == NULL) {
screamer 0:7a64fbb4069d 1216 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 2, ("dhcp_unfold_reply(): could not allocate dhcp->msg_in\n"));
screamer 0:7a64fbb4069d 1217 mem_free((void *)dhcp->options_in);
screamer 0:7a64fbb4069d 1218 dhcp->options_in = NULL;
screamer 0:7a64fbb4069d 1219 return ERR_MEM;
screamer 0:7a64fbb4069d 1220 }
screamer 0:7a64fbb4069d 1221
screamer 0:7a64fbb4069d 1222 /** copy the DHCP message without options */
screamer 0:7a64fbb4069d 1223 ret = pbuf_copy_partial(dhcp->p, dhcp->msg_in, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN, 0);
screamer 0:7a64fbb4069d 1224 LWIP_ASSERT("ret == sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN", ret == sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN);
screamer 0:7a64fbb4069d 1225 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_unfold_reply(): copied %"U16_F" bytes into dhcp->msg_in[]\n",
screamer 0:7a64fbb4069d 1226 sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN));
screamer 0:7a64fbb4069d 1227
screamer 0:7a64fbb4069d 1228 if (dhcp->options_in != NULL) {
screamer 0:7a64fbb4069d 1229 /** copy the DHCP options */
screamer 0:7a64fbb4069d 1230 ret = pbuf_copy_partial(dhcp->p, dhcp->options_in, dhcp->options_in_len, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN);
screamer 0:7a64fbb4069d 1231 LWIP_ASSERT("ret == dhcp->options_in_len", ret == dhcp->options_in_len);
screamer 0:7a64fbb4069d 1232 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_unfold_reply(): copied %"U16_F" bytes to dhcp->options_in[]\n",
screamer 0:7a64fbb4069d 1233 dhcp->options_in_len));
screamer 0:7a64fbb4069d 1234 }
screamer 0:7a64fbb4069d 1235 LWIP_UNUSED_ARG(ret);
screamer 0:7a64fbb4069d 1236 return ERR_OK;
screamer 0:7a64fbb4069d 1237 }
screamer 0:7a64fbb4069d 1238
screamer 0:7a64fbb4069d 1239 /**
screamer 0:7a64fbb4069d 1240 * Free the incoming DHCP message including contiguous copy of
screamer 0:7a64fbb4069d 1241 * its DHCP options.
screamer 0:7a64fbb4069d 1242 *
screamer 0:7a64fbb4069d 1243 */
screamer 0:7a64fbb4069d 1244 static void dhcp_free_reply(struct dhcp *dhcp)
screamer 0:7a64fbb4069d 1245 {
screamer 0:7a64fbb4069d 1246 if (dhcp->msg_in != NULL) {
screamer 0:7a64fbb4069d 1247 mem_free((void *)dhcp->msg_in);
screamer 0:7a64fbb4069d 1248 dhcp->msg_in = NULL;
screamer 0:7a64fbb4069d 1249 }
screamer 0:7a64fbb4069d 1250 if (dhcp->options_in) {
screamer 0:7a64fbb4069d 1251 mem_free((void *)dhcp->options_in);
screamer 0:7a64fbb4069d 1252 dhcp->options_in = NULL;
screamer 0:7a64fbb4069d 1253 dhcp->options_in_len = 0;
screamer 0:7a64fbb4069d 1254 }
screamer 0:7a64fbb4069d 1255 LWIP_DEBUGF(DHCP_DEBUG, ("dhcp_free_reply(): free'd\n"));
screamer 0:7a64fbb4069d 1256 }
screamer 0:7a64fbb4069d 1257
screamer 0:7a64fbb4069d 1258
screamer 0:7a64fbb4069d 1259 /**
screamer 0:7a64fbb4069d 1260 * If an incoming DHCP message is in response to us, then trigger the state machine
screamer 0:7a64fbb4069d 1261 */
screamer 0:7a64fbb4069d 1262 static void dhcp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, struct ip_addr *addr, u16_t port)
screamer 0:7a64fbb4069d 1263 {
screamer 0:7a64fbb4069d 1264 struct netif *netif = (struct netif *)arg;
screamer 0:7a64fbb4069d 1265 struct dhcp *dhcp = netif->dhcp;
screamer 0:7a64fbb4069d 1266 struct dhcp_msg *reply_msg = (struct dhcp_msg *)p->payload;
screamer 0:7a64fbb4069d 1267 u8_t *options_ptr;
screamer 0:7a64fbb4069d 1268 u8_t msg_type;
screamer 0:7a64fbb4069d 1269 u8_t i;
screamer 0:7a64fbb4069d 1270 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 3, ("dhcp_recv(pbuf = %p) from DHCP server %"U16_F".%"U16_F".%"U16_F".%"U16_F" port %"U16_F"\n", (void*)p,
screamer 0:7a64fbb4069d 1271 (u16_t)(ntohl(addr->addr) >> 24 & 0xff), (u16_t)(ntohl(addr->addr) >> 16 & 0xff),
screamer 0:7a64fbb4069d 1272 (u16_t)(ntohl(addr->addr) >> 8 & 0xff), (u16_t)(ntohl(addr->addr) & 0xff), port));
screamer 0:7a64fbb4069d 1273 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("pbuf->len = %"U16_F"\n", p->len));
screamer 0:7a64fbb4069d 1274 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("pbuf->tot_len = %"U16_F"\n", p->tot_len));
screamer 0:7a64fbb4069d 1275 /* prevent warnings about unused arguments */
screamer 0:7a64fbb4069d 1276 LWIP_UNUSED_ARG(pcb);
screamer 0:7a64fbb4069d 1277 LWIP_UNUSED_ARG(addr);
screamer 0:7a64fbb4069d 1278 LWIP_UNUSED_ARG(port);
screamer 0:7a64fbb4069d 1279 dhcp->p = p;
screamer 0:7a64fbb4069d 1280 /* TODO: check packet length before reading them */
screamer 0:7a64fbb4069d 1281 if (reply_msg->op != DHCP_BOOTREPLY) {
screamer 0:7a64fbb4069d 1282 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 1, ("not a DHCP reply message, but type %"U16_F"\n", (u16_t)reply_msg->op));
screamer 0:7a64fbb4069d 1283 goto free_pbuf_and_return;
screamer 0:7a64fbb4069d 1284 }
screamer 0:7a64fbb4069d 1285 /* iterate through hardware address and match against DHCP message */
screamer 0:7a64fbb4069d 1286 for (i = 0; i < netif->hwaddr_len; i++) {
screamer 0:7a64fbb4069d 1287 if (netif->hwaddr[i] != reply_msg->chaddr[i]) {
screamer 0:7a64fbb4069d 1288 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 2, ("netif->hwaddr[%"U16_F"]==%02"X16_F" != reply_msg->chaddr[%"U16_F"]==%02"X16_F"\n",
screamer 0:7a64fbb4069d 1289 (u16_t)i, (u16_t)netif->hwaddr[i], (u16_t)i, (u16_t)reply_msg->chaddr[i]));
screamer 0:7a64fbb4069d 1290 goto free_pbuf_and_return;
screamer 0:7a64fbb4069d 1291 }
screamer 0:7a64fbb4069d 1292 }
screamer 0:7a64fbb4069d 1293 /* match transaction ID against what we expected */
screamer 0:7a64fbb4069d 1294 if (ntohl(reply_msg->xid) != dhcp->xid) {
screamer 0:7a64fbb4069d 1295 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 2, ("transaction id mismatch reply_msg->xid(%"X32_F")!=dhcp->xid(%"X32_F")\n",ntohl(reply_msg->xid),dhcp->xid));
screamer 0:7a64fbb4069d 1296 goto free_pbuf_and_return;
screamer 0:7a64fbb4069d 1297 }
screamer 0:7a64fbb4069d 1298 /* option fields could be unfold? */
screamer 0:7a64fbb4069d 1299 if (dhcp_unfold_reply(dhcp) != ERR_OK) {
screamer 0:7a64fbb4069d 1300 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 2, ("problem unfolding DHCP message - too short on memory?\n"));
screamer 0:7a64fbb4069d 1301 goto free_pbuf_and_return;
screamer 0:7a64fbb4069d 1302 }
screamer 0:7a64fbb4069d 1303
screamer 0:7a64fbb4069d 1304 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("searching DHCP_OPTION_MESSAGE_TYPE\n"));
screamer 0:7a64fbb4069d 1305 /* obtain pointer to DHCP message type */
screamer 0:7a64fbb4069d 1306 options_ptr = dhcp_get_option_ptr(dhcp, DHCP_OPTION_MESSAGE_TYPE);
screamer 0:7a64fbb4069d 1307 if (options_ptr == NULL) {
screamer 0:7a64fbb4069d 1308 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 1, ("DHCP_OPTION_MESSAGE_TYPE option not found\n"));
screamer 0:7a64fbb4069d 1309 goto free_pbuf_and_return;
screamer 0:7a64fbb4069d 1310 }
screamer 0:7a64fbb4069d 1311
screamer 0:7a64fbb4069d 1312 /* read DHCP message type */
screamer 0:7a64fbb4069d 1313 msg_type = dhcp_get_option_byte(options_ptr + 2);
screamer 0:7a64fbb4069d 1314 /* message type is DHCP ACK? */
screamer 0:7a64fbb4069d 1315 if (msg_type == DHCP_ACK) {
screamer 0:7a64fbb4069d 1316 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 1, ("DHCP_ACK received\n"));
screamer 0:7a64fbb4069d 1317 /* in requesting state? */
screamer 0:7a64fbb4069d 1318 if (dhcp->state == DHCP_REQUESTING) {
screamer 0:7a64fbb4069d 1319 dhcp_handle_ack(netif);
screamer 0:7a64fbb4069d 1320 dhcp->request_timeout = 0;
screamer 0:7a64fbb4069d 1321 #if DHCP_DOES_ARP_CHECK
screamer 0:7a64fbb4069d 1322 /* check if the acknowledged lease address is already in use */
screamer 0:7a64fbb4069d 1323 dhcp_check(netif);
screamer 0:7a64fbb4069d 1324 #else
screamer 0:7a64fbb4069d 1325 /* bind interface to the acknowledged lease address */
screamer 0:7a64fbb4069d 1326 dhcp_bind(netif);
screamer 0:7a64fbb4069d 1327 #endif
screamer 0:7a64fbb4069d 1328 }
screamer 0:7a64fbb4069d 1329 /* already bound to the given lease address? */
screamer 0:7a64fbb4069d 1330 else if ((dhcp->state == DHCP_REBOOTING) || (dhcp->state == DHCP_REBINDING) || (dhcp->state == DHCP_RENEWING)) {
screamer 0:7a64fbb4069d 1331 dhcp->request_timeout = 0;
screamer 0:7a64fbb4069d 1332 dhcp_bind(netif);
screamer 0:7a64fbb4069d 1333 }
screamer 0:7a64fbb4069d 1334 }
screamer 0:7a64fbb4069d 1335 /* received a DHCP_NAK in appropriate state? */
screamer 0:7a64fbb4069d 1336 else if ((msg_type == DHCP_NAK) &&
screamer 0:7a64fbb4069d 1337 ((dhcp->state == DHCP_REBOOTING) || (dhcp->state == DHCP_REQUESTING) ||
screamer 0:7a64fbb4069d 1338 (dhcp->state == DHCP_REBINDING) || (dhcp->state == DHCP_RENEWING ))) {
screamer 0:7a64fbb4069d 1339 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 1, ("DHCP_NAK received\n"));
screamer 0:7a64fbb4069d 1340 dhcp->request_timeout = 0;
screamer 0:7a64fbb4069d 1341 dhcp_handle_nak(netif);
screamer 0:7a64fbb4069d 1342 }
screamer 0:7a64fbb4069d 1343 /* received a DHCP_OFFER in DHCP_SELECTING state? */
screamer 0:7a64fbb4069d 1344 else if ((msg_type == DHCP_OFFER) && (dhcp->state == DHCP_SELECTING)) {
screamer 0:7a64fbb4069d 1345 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 1, ("DHCP_OFFER received in DHCP_SELECTING state\n"));
screamer 0:7a64fbb4069d 1346 dhcp->request_timeout = 0;
screamer 0:7a64fbb4069d 1347 /* remember offered lease */
screamer 0:7a64fbb4069d 1348 dhcp_handle_offer(netif);
screamer 0:7a64fbb4069d 1349 }
screamer 0:7a64fbb4069d 1350 free_pbuf_and_return:
screamer 0:7a64fbb4069d 1351 dhcp_free_reply(dhcp);
screamer 0:7a64fbb4069d 1352 pbuf_free(p);
screamer 0:7a64fbb4069d 1353 dhcp->p = NULL;
screamer 0:7a64fbb4069d 1354 }
screamer 0:7a64fbb4069d 1355
screamer 0:7a64fbb4069d 1356 /**
screamer 0:7a64fbb4069d 1357 * Create a DHCP request, fill in common headers
screamer 0:7a64fbb4069d 1358 *
screamer 0:7a64fbb4069d 1359 * @param netif the netif under DHCP control
screamer 0:7a64fbb4069d 1360 */
screamer 0:7a64fbb4069d 1361 static err_t
screamer 0:7a64fbb4069d 1362 dhcp_create_request(struct netif *netif)
screamer 0:7a64fbb4069d 1363 {
screamer 0:7a64fbb4069d 1364 struct dhcp *dhcp;
screamer 0:7a64fbb4069d 1365 u16_t i;
screamer 0:7a64fbb4069d 1366 #ifndef DHCP_GLOBAL_XID
screamer 0:7a64fbb4069d 1367 /** default global transaction identifier starting value (easy to match
screamer 0:7a64fbb4069d 1368 * with a packet analyser). We simply increment for each new request.
screamer 0:7a64fbb4069d 1369 * Predefine DHCP_GLOBAL_XID to a better value or a function call to generate one
screamer 0:7a64fbb4069d 1370 * at runtime, any supporting function prototypes can be defined in DHCP_GLOBAL_XID_HEADER */
screamer 0:7a64fbb4069d 1371 static u32_t xid = 0xABCD0000;
screamer 0:7a64fbb4069d 1372 #else
screamer 0:7a64fbb4069d 1373 static u32_t xid;
screamer 0:7a64fbb4069d 1374 static u8_t xid_initialised = 0;
screamer 0:7a64fbb4069d 1375 if (!xid_initialised) {
screamer 0:7a64fbb4069d 1376 xid = DHCP_GLOBAL_XID;
screamer 0:7a64fbb4069d 1377 xid_initialised = !xid_initialised;
screamer 0:7a64fbb4069d 1378 }
screamer 0:7a64fbb4069d 1379 #endif
screamer 0:7a64fbb4069d 1380 LWIP_ERROR("dhcp_create_request: netif != NULL", (netif != NULL), return ERR_ARG;);
screamer 0:7a64fbb4069d 1381 dhcp = netif->dhcp;
screamer 0:7a64fbb4069d 1382 LWIP_ERROR("dhcp_create_request: dhcp != NULL", (dhcp != NULL), return ERR_VAL;);
screamer 0:7a64fbb4069d 1383 LWIP_ASSERT("dhcp_create_request: dhcp->p_out == NULL", dhcp->p_out == NULL);
screamer 0:7a64fbb4069d 1384 LWIP_ASSERT("dhcp_create_request: dhcp->msg_out == NULL", dhcp->msg_out == NULL);
screamer 0:7a64fbb4069d 1385 dhcp->p_out = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct dhcp_msg), PBUF_RAM);
screamer 0:7a64fbb4069d 1386 if (dhcp->p_out == NULL) {
screamer 0:7a64fbb4069d 1387 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 2, ("dhcp_create_request(): could not allocate pbuf\n"));
screamer 0:7a64fbb4069d 1388 return ERR_MEM;
screamer 0:7a64fbb4069d 1389 }
screamer 0:7a64fbb4069d 1390 LWIP_ASSERT("dhcp_create_request: check that first pbuf can hold struct dhcp_msg",
screamer 0:7a64fbb4069d 1391 (dhcp->p_out->len >= sizeof(struct dhcp_msg)));
screamer 0:7a64fbb4069d 1392
screamer 0:7a64fbb4069d 1393 /* give unique transaction identifier to this request */
screamer 0:7a64fbb4069d 1394 dhcp->xid = xid++;
screamer 0:7a64fbb4069d 1395 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 2, ("transaction id xid++(%"X32_F") dhcp->xid(%"U32_F")\n",xid,dhcp->xid));
screamer 0:7a64fbb4069d 1396
screamer 0:7a64fbb4069d 1397 dhcp->msg_out = (struct dhcp_msg *)dhcp->p_out->payload;
screamer 0:7a64fbb4069d 1398
screamer 0:7a64fbb4069d 1399 dhcp->msg_out->op = DHCP_BOOTREQUEST;
screamer 0:7a64fbb4069d 1400 /* TODO: make link layer independent */
screamer 0:7a64fbb4069d 1401 dhcp->msg_out->htype = DHCP_HTYPE_ETH;
screamer 0:7a64fbb4069d 1402 /* TODO: make link layer independent */
screamer 0:7a64fbb4069d 1403 dhcp->msg_out->hlen = DHCP_HLEN_ETH;
screamer 0:7a64fbb4069d 1404 dhcp->msg_out->hops = 0;
screamer 0:7a64fbb4069d 1405 dhcp->msg_out->xid = htonl(dhcp->xid);
screamer 0:7a64fbb4069d 1406 dhcp->msg_out->secs = 0;
screamer 0:7a64fbb4069d 1407 dhcp->msg_out->flags = 0;
screamer 0:7a64fbb4069d 1408 dhcp->msg_out->ciaddr.addr = netif->ip_addr.addr;
screamer 0:7a64fbb4069d 1409 dhcp->msg_out->yiaddr.addr = 0;
screamer 0:7a64fbb4069d 1410 dhcp->msg_out->siaddr.addr = 0;
screamer 0:7a64fbb4069d 1411 dhcp->msg_out->giaddr.addr = 0;
screamer 0:7a64fbb4069d 1412 for (i = 0; i < DHCP_CHADDR_LEN; i++) {
screamer 0:7a64fbb4069d 1413 /* copy netif hardware address, pad with zeroes */
screamer 0:7a64fbb4069d 1414 dhcp->msg_out->chaddr[i] = (i < netif->hwaddr_len) ? netif->hwaddr[i] : 0/* pad byte*/;
screamer 0:7a64fbb4069d 1415 }
screamer 0:7a64fbb4069d 1416 for (i = 0; i < DHCP_SNAME_LEN; i++) {
screamer 0:7a64fbb4069d 1417 dhcp->msg_out->sname[i] = 0;
screamer 0:7a64fbb4069d 1418 }
screamer 0:7a64fbb4069d 1419 for (i = 0; i < DHCP_FILE_LEN; i++) {
screamer 0:7a64fbb4069d 1420 dhcp->msg_out->file[i] = 0;
screamer 0:7a64fbb4069d 1421 }
screamer 0:7a64fbb4069d 1422 dhcp->msg_out->cookie = htonl(0x63825363UL);
screamer 0:7a64fbb4069d 1423 dhcp->options_out_len = 0;
screamer 0:7a64fbb4069d 1424 /* fill options field with an incrementing array (for debugging purposes) */
screamer 0:7a64fbb4069d 1425 for (i = 0; i < DHCP_OPTIONS_LEN; i++) {
screamer 0:7a64fbb4069d 1426 dhcp->msg_out->options[i] = (u8_t)i; /* for debugging only, no matter if truncated */
screamer 0:7a64fbb4069d 1427 }
screamer 0:7a64fbb4069d 1428 return ERR_OK;
screamer 0:7a64fbb4069d 1429 }
screamer 0:7a64fbb4069d 1430
screamer 0:7a64fbb4069d 1431 /**
screamer 0:7a64fbb4069d 1432 * Free previously allocated memory used to send a DHCP request.
screamer 0:7a64fbb4069d 1433 *
screamer 0:7a64fbb4069d 1434 * @param netif the netif under DHCP control
screamer 0:7a64fbb4069d 1435 */
screamer 0:7a64fbb4069d 1436 static void
screamer 0:7a64fbb4069d 1437 dhcp_delete_request(struct netif *netif)
screamer 0:7a64fbb4069d 1438 {
screamer 0:7a64fbb4069d 1439 struct dhcp *dhcp;
screamer 0:7a64fbb4069d 1440 LWIP_ERROR("dhcp_delete_request: netif != NULL", (netif != NULL), return;);
screamer 0:7a64fbb4069d 1441 dhcp = netif->dhcp;
screamer 0:7a64fbb4069d 1442 LWIP_ERROR("dhcp_delete_request: dhcp != NULL", (dhcp != NULL), return;);
screamer 0:7a64fbb4069d 1443 LWIP_ASSERT("dhcp_delete_request: dhcp->p_out != NULL", dhcp->p_out != NULL);
screamer 0:7a64fbb4069d 1444 LWIP_ASSERT("dhcp_delete_request: dhcp->msg_out != NULL", dhcp->msg_out != NULL);
screamer 0:7a64fbb4069d 1445 if (dhcp->p_out != NULL) {
screamer 0:7a64fbb4069d 1446 pbuf_free(dhcp->p_out);
screamer 0:7a64fbb4069d 1447 }
screamer 0:7a64fbb4069d 1448 dhcp->p_out = NULL;
screamer 0:7a64fbb4069d 1449 dhcp->msg_out = NULL;
screamer 0:7a64fbb4069d 1450 }
screamer 0:7a64fbb4069d 1451
screamer 0:7a64fbb4069d 1452 /**
screamer 0:7a64fbb4069d 1453 * Add a DHCP message trailer
screamer 0:7a64fbb4069d 1454 *
screamer 0:7a64fbb4069d 1455 * Adds the END option to the DHCP message, and if
screamer 0:7a64fbb4069d 1456 * necessary, up to three padding bytes.
screamer 0:7a64fbb4069d 1457 *
screamer 0:7a64fbb4069d 1458 * @param dhcp DHCP state structure
screamer 0:7a64fbb4069d 1459 */
screamer 0:7a64fbb4069d 1460 static void
screamer 0:7a64fbb4069d 1461 dhcp_option_trailer(struct dhcp *dhcp)
screamer 0:7a64fbb4069d 1462 {
screamer 0:7a64fbb4069d 1463 LWIP_ERROR("dhcp_option_trailer: dhcp != NULL", (dhcp != NULL), return;);
screamer 0:7a64fbb4069d 1464 LWIP_ASSERT("dhcp_option_trailer: dhcp->msg_out != NULL\n", dhcp->msg_out != NULL);
screamer 0:7a64fbb4069d 1465 LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
screamer 0:7a64fbb4069d 1466 dhcp->msg_out->options[dhcp->options_out_len++] = DHCP_OPTION_END;
screamer 0:7a64fbb4069d 1467 /* packet is too small, or not 4 byte aligned? */
screamer 0:7a64fbb4069d 1468 while ((dhcp->options_out_len < DHCP_MIN_OPTIONS_LEN) || (dhcp->options_out_len & 3)) {
screamer 0:7a64fbb4069d 1469 /* 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)); */
screamer 0:7a64fbb4069d 1470 LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
screamer 0:7a64fbb4069d 1471 /* add a fill/padding byte */
screamer 0:7a64fbb4069d 1472 dhcp->msg_out->options[dhcp->options_out_len++] = 0;
screamer 0:7a64fbb4069d 1473 }
screamer 0:7a64fbb4069d 1474 }
screamer 0:7a64fbb4069d 1475
screamer 0:7a64fbb4069d 1476 /**
screamer 0:7a64fbb4069d 1477 * Find the offset of a DHCP option inside the DHCP message.
screamer 0:7a64fbb4069d 1478 *
screamer 0:7a64fbb4069d 1479 * @param dhcp DHCP client
screamer 0:7a64fbb4069d 1480 * @param option_type
screamer 0:7a64fbb4069d 1481 *
screamer 0:7a64fbb4069d 1482 * @return a byte offset into the UDP message where the option was found, or
screamer 0:7a64fbb4069d 1483 * zero if the given option was not found.
screamer 0:7a64fbb4069d 1484 */
screamer 0:7a64fbb4069d 1485 static u8_t *dhcp_get_option_ptr(struct dhcp *dhcp, u8_t option_type)
screamer 0:7a64fbb4069d 1486 {
screamer 0:7a64fbb4069d 1487 u8_t overload = DHCP_OVERLOAD_NONE;
screamer 0:7a64fbb4069d 1488
screamer 0:7a64fbb4069d 1489 /* options available? */
screamer 0:7a64fbb4069d 1490 if ((dhcp->options_in != NULL) && (dhcp->options_in_len > 0)) {
screamer 0:7a64fbb4069d 1491 /* start with options field */
screamer 0:7a64fbb4069d 1492 u8_t *options = (u8_t *)dhcp->options_in;
screamer 0:7a64fbb4069d 1493 u16_t offset = 0;
screamer 0:7a64fbb4069d 1494 /* at least 1 byte to read and no end marker, then at least 3 bytes to read? */
screamer 0:7a64fbb4069d 1495 while ((offset < dhcp->options_in_len) && (options[offset] != DHCP_OPTION_END)) {
screamer 0:7a64fbb4069d 1496 /* LWIP_DEBUGF(DHCP_DEBUG, ("msg_offset=%"U16_F", q->len=%"U16_F, msg_offset, q->len)); */
screamer 0:7a64fbb4069d 1497 /* are the sname and/or file field overloaded with options? */
screamer 0:7a64fbb4069d 1498 if (options[offset] == DHCP_OPTION_OVERLOAD) {
screamer 0:7a64fbb4069d 1499 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 2, ("overloaded message detected\n"));
screamer 0:7a64fbb4069d 1500 /* skip option type and length */
screamer 0:7a64fbb4069d 1501 offset += 2;
screamer 0:7a64fbb4069d 1502 overload = options[offset++];
screamer 0:7a64fbb4069d 1503 }
screamer 0:7a64fbb4069d 1504 /* requested option found */
screamer 0:7a64fbb4069d 1505 else if (options[offset] == option_type) {
screamer 0:7a64fbb4069d 1506 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("option found at offset %"U16_F" in options\n", offset));
screamer 0:7a64fbb4069d 1507 return &options[offset];
screamer 0:7a64fbb4069d 1508 /* skip option */
screamer 0:7a64fbb4069d 1509 } else {
screamer 0:7a64fbb4069d 1510 LWIP_DEBUGF(DHCP_DEBUG, ("skipping option %"U16_F" in options\n", options[offset]));
screamer 0:7a64fbb4069d 1511 /* skip option type */
screamer 0:7a64fbb4069d 1512 offset++;
screamer 0:7a64fbb4069d 1513 /* skip option length, and then length bytes */
screamer 0:7a64fbb4069d 1514 offset += 1 + options[offset];
screamer 0:7a64fbb4069d 1515 }
screamer 0:7a64fbb4069d 1516 }
screamer 0:7a64fbb4069d 1517 /* is this an overloaded message? */
screamer 0:7a64fbb4069d 1518 if (overload != DHCP_OVERLOAD_NONE) {
screamer 0:7a64fbb4069d 1519 u16_t field_len;
screamer 0:7a64fbb4069d 1520 if (overload == DHCP_OVERLOAD_FILE) {
screamer 0:7a64fbb4069d 1521 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 1, ("overloaded file field\n"));
screamer 0:7a64fbb4069d 1522 options = (u8_t *)&dhcp->msg_in->file;
screamer 0:7a64fbb4069d 1523 field_len = DHCP_FILE_LEN;
screamer 0:7a64fbb4069d 1524 } else if (overload == DHCP_OVERLOAD_SNAME) {
screamer 0:7a64fbb4069d 1525 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 1, ("overloaded sname field\n"));
screamer 0:7a64fbb4069d 1526 options = (u8_t *)&dhcp->msg_in->sname;
screamer 0:7a64fbb4069d 1527 field_len = DHCP_SNAME_LEN;
screamer 0:7a64fbb4069d 1528 /* TODO: check if else if () is necessary */
screamer 0:7a64fbb4069d 1529 } else {
screamer 0:7a64fbb4069d 1530 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 1, ("overloaded sname and file field\n"));
screamer 0:7a64fbb4069d 1531 options = (u8_t *)&dhcp->msg_in->sname;
screamer 0:7a64fbb4069d 1532 field_len = DHCP_FILE_LEN + DHCP_SNAME_LEN;
screamer 0:7a64fbb4069d 1533 }
screamer 0:7a64fbb4069d 1534 offset = 0;
screamer 0:7a64fbb4069d 1535
screamer 0:7a64fbb4069d 1536 /* at least 1 byte to read and no end marker */
screamer 0:7a64fbb4069d 1537 while ((offset < field_len) && (options[offset] != DHCP_OPTION_END)) {
screamer 0:7a64fbb4069d 1538 if (options[offset] == option_type) {
screamer 0:7a64fbb4069d 1539 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("option found at offset=%"U16_F"\n", offset));
screamer 0:7a64fbb4069d 1540 return &options[offset];
screamer 0:7a64fbb4069d 1541 /* skip option */
screamer 0:7a64fbb4069d 1542 } else {
screamer 0:7a64fbb4069d 1543 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("skipping option %"U16_F"\n", options[offset]));
screamer 0:7a64fbb4069d 1544 /* skip option type */
screamer 0:7a64fbb4069d 1545 offset++;
screamer 0:7a64fbb4069d 1546 offset += 1 + options[offset];
screamer 0:7a64fbb4069d 1547 }
screamer 0:7a64fbb4069d 1548 }
screamer 0:7a64fbb4069d 1549 }
screamer 0:7a64fbb4069d 1550 }
screamer 0:7a64fbb4069d 1551 return NULL;
screamer 0:7a64fbb4069d 1552 }
screamer 0:7a64fbb4069d 1553
screamer 0:7a64fbb4069d 1554 /**
screamer 0:7a64fbb4069d 1555 * Return the byte of DHCP option data.
screamer 0:7a64fbb4069d 1556 *
screamer 0:7a64fbb4069d 1557 * @param client DHCP client.
screamer 0:7a64fbb4069d 1558 * @param ptr pointer obtained by dhcp_get_option_ptr().
screamer 0:7a64fbb4069d 1559 *
screamer 0:7a64fbb4069d 1560 * @return byte value at the given address.
screamer 0:7a64fbb4069d 1561 */
screamer 0:7a64fbb4069d 1562 static u8_t
screamer 0:7a64fbb4069d 1563 dhcp_get_option_byte(u8_t *ptr)
screamer 0:7a64fbb4069d 1564 {
screamer 0:7a64fbb4069d 1565 LWIP_DEBUGF(DHCP_DEBUG, ("option byte value=%"U16_F"\n", (u16_t)(*ptr)));
screamer 0:7a64fbb4069d 1566 return *ptr;
screamer 0:7a64fbb4069d 1567 }
screamer 0:7a64fbb4069d 1568
screamer 0:7a64fbb4069d 1569 #if 0 /* currently unused */
screamer 0:7a64fbb4069d 1570 /**
screamer 0:7a64fbb4069d 1571 * Return the 16-bit value of DHCP option data.
screamer 0:7a64fbb4069d 1572 *
screamer 0:7a64fbb4069d 1573 * @param client DHCP client.
screamer 0:7a64fbb4069d 1574 * @param ptr pointer obtained by dhcp_get_option_ptr().
screamer 0:7a64fbb4069d 1575 *
screamer 0:7a64fbb4069d 1576 * @return byte value at the given address.
screamer 0:7a64fbb4069d 1577 */
screamer 0:7a64fbb4069d 1578 static u16_t
screamer 0:7a64fbb4069d 1579 dhcp_get_option_short(u8_t *ptr)
screamer 0:7a64fbb4069d 1580 {
screamer 0:7a64fbb4069d 1581 u16_t value;
screamer 0:7a64fbb4069d 1582 value = *ptr++ << 8;
screamer 0:7a64fbb4069d 1583 value |= *ptr;
screamer 0:7a64fbb4069d 1584 LWIP_DEBUGF(DHCP_DEBUG, ("option short value=%"U16_F"\n", value));
screamer 0:7a64fbb4069d 1585 return value;
screamer 0:7a64fbb4069d 1586 }
screamer 0:7a64fbb4069d 1587 #endif
screamer 0:7a64fbb4069d 1588
screamer 0:7a64fbb4069d 1589 /**
screamer 0:7a64fbb4069d 1590 * Return the 32-bit value of DHCP option data.
screamer 0:7a64fbb4069d 1591 *
screamer 0:7a64fbb4069d 1592 * @param client DHCP client.
screamer 0:7a64fbb4069d 1593 * @param ptr pointer obtained by dhcp_get_option_ptr().
screamer 0:7a64fbb4069d 1594 *
screamer 0:7a64fbb4069d 1595 * @return byte value at the given address.
screamer 0:7a64fbb4069d 1596 */
screamer 0:7a64fbb4069d 1597 static u32_t dhcp_get_option_long(u8_t *ptr)
screamer 0:7a64fbb4069d 1598 {
screamer 0:7a64fbb4069d 1599 u32_t value;
screamer 0:7a64fbb4069d 1600 value = (u32_t)(*ptr++) << 24;
screamer 0:7a64fbb4069d 1601 value |= (u32_t)(*ptr++) << 16;
screamer 0:7a64fbb4069d 1602 value |= (u32_t)(*ptr++) << 8;
screamer 0:7a64fbb4069d 1603 value |= (u32_t)(*ptr++);
screamer 0:7a64fbb4069d 1604 LWIP_DEBUGF(DHCP_DEBUG, ("option long value=%"U32_F"\n", value));
screamer 0:7a64fbb4069d 1605 return value;
screamer 0:7a64fbb4069d 1606 }
screamer 0:7a64fbb4069d 1607
screamer 0:7a64fbb4069d 1608 #endif /* LWIP_DHCP */