Rod Coleman / NetServSB2

Netservices modded to read fragmented HTTP respsonse/payload from special purpose server - 180 bytes only

lwip/core/dhcp.c@0:850eacf3e945, 2011-09-08 (annotated)

Committer:
RodColeman
Date:
Thu Sep 08 10:48:09 2011 +0000
Revision:
0:850eacf3e945
revised fixed length to 178 bytes

Who changed what in which revision?

UserRevisionLine numberNew contents of line
RodColeman 0:850eacf3e945 1 /**
RodColeman 0:850eacf3e945 2 * @file
RodColeman 0:850eacf3e945 3 * Dynamic Host Configuration Protocol client
RodColeman 0:850eacf3e945 4 *
RodColeman 0:850eacf3e945 5 */
RodColeman 0:850eacf3e945 6
RodColeman 0:850eacf3e945 7 /*
RodColeman 0:850eacf3e945 8 *
RodColeman 0:850eacf3e945 9 * Copyright (c) 2001-2004 Leon Woestenberg <leon.woestenberg@gmx.net>
RodColeman 0:850eacf3e945 10 * Copyright (c) 2001-2004 Axon Digital Design B.V., The Netherlands.
RodColeman 0:850eacf3e945 11 * All rights reserved.
RodColeman 0:850eacf3e945 12 *
RodColeman 0:850eacf3e945 13 * Redistribution and use in source and binary forms, with or without modification,
RodColeman 0:850eacf3e945 14 * are permitted provided that the following conditions are met:
RodColeman 0:850eacf3e945 15 *
RodColeman 0:850eacf3e945 16 * 1. Redistributions of source code must retain the above copyright notice,
RodColeman 0:850eacf3e945 17 * this list of conditions and the following disclaimer.
RodColeman 0:850eacf3e945 18 * 2. Redistributions in binary form must reproduce the above copyright notice,
RodColeman 0:850eacf3e945 19 * this list of conditions and the following disclaimer in the documentation
RodColeman 0:850eacf3e945 20 * and/or other materials provided with the distribution.
RodColeman 0:850eacf3e945 21 * 3. The name of the author may not be used to endorse or promote products
RodColeman 0:850eacf3e945 22 * derived from this software without specific prior written permission.
RodColeman 0:850eacf3e945 23 *
RodColeman 0:850eacf3e945 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
RodColeman 0:850eacf3e945 25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
RodColeman 0:850eacf3e945 26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
RodColeman 0:850eacf3e945 27 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
RodColeman 0:850eacf3e945 28 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
RodColeman 0:850eacf3e945 29 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
RodColeman 0:850eacf3e945 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
RodColeman 0:850eacf3e945 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
RodColeman 0:850eacf3e945 32 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
RodColeman 0:850eacf3e945 33 * OF SUCH DAMAGE.
RodColeman 0:850eacf3e945 34 *
RodColeman 0:850eacf3e945 35 * This file is a contribution to the lwIP TCP/IP stack.
RodColeman 0:850eacf3e945 36 * The Swedish Institute of Computer Science and Adam Dunkels
RodColeman 0:850eacf3e945 37 * are specifically granted permission to redistribute this
RodColeman 0:850eacf3e945 38 * source code.
RodColeman 0:850eacf3e945 39 *
RodColeman 0:850eacf3e945 40 * Author: Leon Woestenberg <leon.woestenberg@gmx.net>
RodColeman 0:850eacf3e945 41 *
RodColeman 0:850eacf3e945 42 * This is a DHCP client for the lwIP TCP/IP stack. It aims to conform
RodColeman 0:850eacf3e945 43 * with RFC 2131 and RFC 2132.
RodColeman 0:850eacf3e945 44 *
RodColeman 0:850eacf3e945 45 * TODO:
RodColeman 0:850eacf3e945 46 * - Support for interfaces other than Ethernet (SLIP, PPP, ...)
RodColeman 0:850eacf3e945 47 *
RodColeman 0:850eacf3e945 48 * Please coordinate changes and requests with Leon Woestenberg
RodColeman 0:850eacf3e945 49 * <leon.woestenberg@gmx.net>
RodColeman 0:850eacf3e945 50 *
RodColeman 0:850eacf3e945 51 * Integration with your code:
RodColeman 0:850eacf3e945 52 *
RodColeman 0:850eacf3e945 53 * In lwip/dhcp.h
RodColeman 0:850eacf3e945 54 * #define DHCP_COARSE_TIMER_SECS (recommended 60 which is a minute)
RodColeman 0:850eacf3e945 55 * #define DHCP_FINE_TIMER_MSECS (recommended 500 which equals TCP coarse timer)
RodColeman 0:850eacf3e945 56 *
RodColeman 0:850eacf3e945 57 * Then have your application call dhcp_coarse_tmr() and
RodColeman 0:850eacf3e945 58 * dhcp_fine_tmr() on the defined intervals.
RodColeman 0:850eacf3e945 59 *
RodColeman 0:850eacf3e945 60 * dhcp_start(struct netif *netif);
RodColeman 0:850eacf3e945 61 * starts a DHCP client instance which configures the interface by
RodColeman 0:850eacf3e945 62 * obtaining an IP address lease and maintaining it.
RodColeman 0:850eacf3e945 63 *
RodColeman 0:850eacf3e945 64 * Use dhcp_release(netif) to end the lease and use dhcp_stop(netif)
RodColeman 0:850eacf3e945 65 * to remove the DHCP client.
RodColeman 0:850eacf3e945 66 *
RodColeman 0:850eacf3e945 67 */
RodColeman 0:850eacf3e945 68
RodColeman 0:850eacf3e945 69 #include "lwip/opt.h"
RodColeman 0:850eacf3e945 70
RodColeman 0:850eacf3e945 71 #if LWIP_DHCP /* don't build if not configured for use in lwipopts.h */
RodColeman 0:850eacf3e945 72
RodColeman 0:850eacf3e945 73 #include "lwip/stats.h"
RodColeman 0:850eacf3e945 74 #include "lwip/mem.h"
RodColeman 0:850eacf3e945 75 #include "lwip/udp.h"
RodColeman 0:850eacf3e945 76 #include "lwip/ip_addr.h"
RodColeman 0:850eacf3e945 77 #include "lwip/netif.h"
RodColeman 0:850eacf3e945 78 #include "lwip/def.h"
RodColeman 0:850eacf3e945 79 #include "lwip/sys.h"
RodColeman 0:850eacf3e945 80 #include "lwip/dhcp.h"
RodColeman 0:850eacf3e945 81 #include "lwip/autoip.h"
RodColeman 0:850eacf3e945 82 #include "lwip/dns.h"
RodColeman 0:850eacf3e945 83 #include "netif/etharp.h"
RodColeman 0:850eacf3e945 84
RodColeman 0:850eacf3e945 85 #include <string.h>
RodColeman 0:850eacf3e945 86
RodColeman 0:850eacf3e945 87 /** Default for DHCP_GLOBAL_XID is 0xABCD0000
RodColeman 0:850eacf3e945 88 * This can be changed by defining DHCP_GLOBAL_XID and DHCP_GLOBAL_XID_HEADER, e.g.
RodColeman 0:850eacf3e945 89 * #define DHCP_GLOBAL_XID_HEADER "stdlib.h"
RodColeman 0:850eacf3e945 90 * #define DHCP_GLOBAL_XID rand()
RodColeman 0:850eacf3e945 91 */
RodColeman 0:850eacf3e945 92 #ifdef DHCP_GLOBAL_XID_HEADER
RodColeman 0:850eacf3e945 93 #include DHCP_GLOBAL_XID_HEADER /* include optional starting XID generation prototypes */
RodColeman 0:850eacf3e945 94 #endif
RodColeman 0:850eacf3e945 95
RodColeman 0:850eacf3e945 96 /** DHCP_OPTION_MAX_MSG_SIZE is set to the MTU
RodColeman 0:850eacf3e945 97 * MTU is checked to be big enough in dhcp_start */
RodColeman 0:850eacf3e945 98 #define DHCP_MAX_MSG_LEN(netif) (netif->mtu)
RodColeman 0:850eacf3e945 99 #define DHCP_MAX_MSG_LEN_MIN_REQUIRED 576
RodColeman 0:850eacf3e945 100 /** Minimum length for reply before packet is parsed */
RodColeman 0:850eacf3e945 101 #define DHCP_MIN_REPLY_LEN 44
RodColeman 0:850eacf3e945 102
RodColeman 0:850eacf3e945 103 #define REBOOT_TRIES 2
RodColeman 0:850eacf3e945 104
RodColeman 0:850eacf3e945 105 /** Option handling: options are parsed in dhcp_parse_reply
RodColeman 0:850eacf3e945 106 * and saved in an array where other functions can load them from.
RodColeman 0:850eacf3e945 107 * This might be moved into the struct dhcp (not necessarily since
RodColeman 0:850eacf3e945 108 * lwIP is single-threaded and the array is only used while in recv
RodColeman 0:850eacf3e945 109 * callback). */
RodColeman 0:850eacf3e945 110 #define DHCP_OPTION_IDX_OVERLOAD 0
RodColeman 0:850eacf3e945 111 #define DHCP_OPTION_IDX_MSG_TYPE 1
RodColeman 0:850eacf3e945 112 #define DHCP_OPTION_IDX_SERVER_ID 2
RodColeman 0:850eacf3e945 113 #define DHCP_OPTION_IDX_LEASE_TIME 3
RodColeman 0:850eacf3e945 114 #define DHCP_OPTION_IDX_T1 4
RodColeman 0:850eacf3e945 115 #define DHCP_OPTION_IDX_T2 5
RodColeman 0:850eacf3e945 116 #define DHCP_OPTION_IDX_SUBNET_MASK 6
RodColeman 0:850eacf3e945 117 #define DHCP_OPTION_IDX_ROUTER 7
RodColeman 0:850eacf3e945 118 #define DHCP_OPTION_IDX_DNS_SERVER 8
RodColeman 0:850eacf3e945 119 #define DHCP_OPTION_IDX_MAX (DHCP_OPTION_IDX_DNS_SERVER + DNS_MAX_SERVERS)
RodColeman 0:850eacf3e945 120
RodColeman 0:850eacf3e945 121 /** Holds the decoded option values, only valid while in dhcp_recv.
RodColeman 0:850eacf3e945 122 @todo: move this into struct dhcp? */
RodColeman 0:850eacf3e945 123 u32_t dhcp_rx_options_val[DHCP_OPTION_IDX_MAX];
RodColeman 0:850eacf3e945 124 /** Holds a flag which option was received and is contained in dhcp_rx_options_val,
RodColeman 0:850eacf3e945 125 only valid while in dhcp_recv.
RodColeman 0:850eacf3e945 126 @todo: move this into struct dhcp? */
RodColeman 0:850eacf3e945 127 u8_t dhcp_rx_options_given[DHCP_OPTION_IDX_MAX];
RodColeman 0:850eacf3e945 128
RodColeman 0:850eacf3e945 129 #define dhcp_option_given(dhcp, idx) (dhcp_rx_options_given[idx] != 0)
RodColeman 0:850eacf3e945 130 #define dhcp_got_option(dhcp, idx) (dhcp_rx_options_given[idx] = 1)
RodColeman 0:850eacf3e945 131 #define dhcp_clear_option(dhcp, idx) (dhcp_rx_options_given[idx] = 0)
RodColeman 0:850eacf3e945 132 #define dhcp_clear_all_options(dhcp) (memset(dhcp_rx_options_given, 0, sizeof(dhcp_rx_options_given)))
RodColeman 0:850eacf3e945 133 #define dhcp_get_option_value(dhcp, idx) (dhcp_rx_options_val[idx])
RodColeman 0:850eacf3e945 134 #define dhcp_set_option_value(dhcp, idx, val) (dhcp_rx_options_val[idx] = (val))
RodColeman 0:850eacf3e945 135
RodColeman 0:850eacf3e945 136
RodColeman 0:850eacf3e945 137 /* DHCP client state machine functions */
RodColeman 0:850eacf3e945 138 static err_t dhcp_discover(struct netif *netif);
RodColeman 0:850eacf3e945 139 static err_t dhcp_select(struct netif *netif);
RodColeman 0:850eacf3e945 140 static void dhcp_bind(struct netif *netif);
RodColeman 0:850eacf3e945 141 #if DHCP_DOES_ARP_CHECK
RodColeman 0:850eacf3e945 142 static err_t dhcp_decline(struct netif *netif);
RodColeman 0:850eacf3e945 143 #endif /* DHCP_DOES_ARP_CHECK */
RodColeman 0:850eacf3e945 144 static err_t dhcp_rebind(struct netif *netif);
RodColeman 0:850eacf3e945 145 static err_t dhcp_reboot(struct netif *netif);
RodColeman 0:850eacf3e945 146 static void dhcp_set_state(struct dhcp *dhcp, u8_t new_state);
RodColeman 0:850eacf3e945 147
RodColeman 0:850eacf3e945 148 /* receive, unfold, parse and free incoming messages */
RodColeman 0:850eacf3e945 149 static void dhcp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port);
RodColeman 0:850eacf3e945 150
RodColeman 0:850eacf3e945 151 /* set the DHCP timers */
RodColeman 0:850eacf3e945 152 static void dhcp_timeout(struct netif *netif);
RodColeman 0:850eacf3e945 153 static void dhcp_t1_timeout(struct netif *netif);
RodColeman 0:850eacf3e945 154 static void dhcp_t2_timeout(struct netif *netif);
RodColeman 0:850eacf3e945 155
RodColeman 0:850eacf3e945 156 /* build outgoing messages */
RodColeman 0:850eacf3e945 157 /* create a DHCP message, fill in common headers */
RodColeman 0:850eacf3e945 158 static err_t dhcp_create_msg(struct netif *netif, struct dhcp *dhcp, u8_t message_type);
RodColeman 0:850eacf3e945 159 /* free a DHCP request */
RodColeman 0:850eacf3e945 160 static void dhcp_delete_msg(struct dhcp *dhcp);
RodColeman 0:850eacf3e945 161 /* add a DHCP option (type, then length in bytes) */
RodColeman 0:850eacf3e945 162 static void dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len);
RodColeman 0:850eacf3e945 163 /* add option values */
RodColeman 0:850eacf3e945 164 static void dhcp_option_byte(struct dhcp *dhcp, u8_t value);
RodColeman 0:850eacf3e945 165 static void dhcp_option_short(struct dhcp *dhcp, u16_t value);
RodColeman 0:850eacf3e945 166 static void dhcp_option_long(struct dhcp *dhcp, u32_t value);
RodColeman 0:850eacf3e945 167 /* always add the DHCP options trailer to end and pad */
RodColeman 0:850eacf3e945 168 static void dhcp_option_trailer(struct dhcp *dhcp);
RodColeman 0:850eacf3e945 169
RodColeman 0:850eacf3e945 170 /**
RodColeman 0:850eacf3e945 171 * Back-off the DHCP client (because of a received NAK response).
RodColeman 0:850eacf3e945 172 *
RodColeman 0:850eacf3e945 173 * Back-off the DHCP client because of a received NAK. Receiving a
RodColeman 0:850eacf3e945 174 * NAK means the client asked for something non-sensible, for
RodColeman 0:850eacf3e945 175 * example when it tries to renew a lease obtained on another network.
RodColeman 0:850eacf3e945 176 *
RodColeman 0:850eacf3e945 177 * We clear any existing set IP address and restart DHCP negotiation
RodColeman 0:850eacf3e945 178 * afresh (as per RFC2131 3.2.3).
RodColeman 0:850eacf3e945 179 *
RodColeman 0:850eacf3e945 180 * @param netif the netif under DHCP control
RodColeman 0:850eacf3e945 181 */
RodColeman 0:850eacf3e945 182 static void
RodColeman 0:850eacf3e945 183 dhcp_handle_nak(struct netif *netif)
RodColeman 0:850eacf3e945 184 {
RodColeman 0:850eacf3e945 185 struct dhcp *dhcp = netif->dhcp;
RodColeman 0:850eacf3e945 186 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_handle_nak(netif=%p) %c%c%"U16_F"\n",
RodColeman 0:850eacf3e945 187 (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
RodColeman 0:850eacf3e945 188 /* Set the interface down since the address must no longer be used, as per RFC2131 */
RodColeman 0:850eacf3e945 189 netif_set_down(netif);
RodColeman 0:850eacf3e945 190 /* remove IP address from interface */
RodColeman 0:850eacf3e945 191 netif_set_ipaddr(netif, IP_ADDR_ANY);
RodColeman 0:850eacf3e945 192 netif_set_gw(netif, IP_ADDR_ANY);
RodColeman 0:850eacf3e945 193 netif_set_netmask(netif, IP_ADDR_ANY);
RodColeman 0:850eacf3e945 194 /* Change to a defined state */
RodColeman 0:850eacf3e945 195 dhcp_set_state(dhcp, DHCP_BACKING_OFF);
RodColeman 0:850eacf3e945 196 /* We can immediately restart discovery */
RodColeman 0:850eacf3e945 197 dhcp_discover(netif);
RodColeman 0:850eacf3e945 198 }
RodColeman 0:850eacf3e945 199
RodColeman 0:850eacf3e945 200 #if DHCP_DOES_ARP_CHECK
RodColeman 0:850eacf3e945 201 /**
RodColeman 0:850eacf3e945 202 * Checks if the offered IP address is already in use.
RodColeman 0:850eacf3e945 203 *
RodColeman 0:850eacf3e945 204 * It does so by sending an ARP request for the offered address and
RodColeman 0:850eacf3e945 205 * entering CHECKING state. If no ARP reply is received within a small
RodColeman 0:850eacf3e945 206 * interval, the address is assumed to be free for use by us.
RodColeman 0:850eacf3e945 207 *
RodColeman 0:850eacf3e945 208 * @param netif the netif under DHCP control
RodColeman 0:850eacf3e945 209 */
RodColeman 0:850eacf3e945 210 static void
RodColeman 0:850eacf3e945 211 dhcp_check(struct netif *netif)
RodColeman 0:850eacf3e945 212 {
RodColeman 0:850eacf3e945 213 struct dhcp *dhcp = netif->dhcp;
RodColeman 0:850eacf3e945 214 err_t result;
RodColeman 0:850eacf3e945 215 u16_t msecs;
RodColeman 0:850eacf3e945 216 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_check(netif=%p) %c%c\n", (void *)netif, (s16_t)netif->name[0],
RodColeman 0:850eacf3e945 217 (s16_t)netif->name[1]));
RodColeman 0:850eacf3e945 218 dhcp_set_state(dhcp, DHCP_CHECKING);
RodColeman 0:850eacf3e945 219 /* create an ARP query for the offered IP address, expecting that no host
RodColeman 0:850eacf3e945 220 responds, as the IP address should not be in use. */
RodColeman 0:850eacf3e945 221 result = etharp_query(netif, &dhcp->offered_ip_addr, NULL);
RodColeman 0:850eacf3e945 222 if (result != ERR_OK) {
RodColeman 0:850eacf3e945 223 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("dhcp_check: could not perform ARP query\n"));
RodColeman 0:850eacf3e945 224 }
RodColeman 0:850eacf3e945 225 dhcp->tries++;
RodColeman 0:850eacf3e945 226 msecs = 500;
RodColeman 0:850eacf3e945 227 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
RodColeman 0:850eacf3e945 228 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_check(): set request timeout %"U16_F" msecs\n", msecs));
RodColeman 0:850eacf3e945 229 }
RodColeman 0:850eacf3e945 230 #endif /* DHCP_DOES_ARP_CHECK */
RodColeman 0:850eacf3e945 231
RodColeman 0:850eacf3e945 232 /**
RodColeman 0:850eacf3e945 233 * Remember the configuration offered by a DHCP server.
RodColeman 0:850eacf3e945 234 *
RodColeman 0:850eacf3e945 235 * @param netif the netif under DHCP control
RodColeman 0:850eacf3e945 236 */
RodColeman 0:850eacf3e945 237 static void
RodColeman 0:850eacf3e945 238 dhcp_handle_offer(struct netif *netif)
RodColeman 0:850eacf3e945 239 {
RodColeman 0:850eacf3e945 240 struct dhcp *dhcp = netif->dhcp;
RodColeman 0:850eacf3e945 241 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_handle_offer(netif=%p) %c%c%"U16_F"\n",
RodColeman 0:850eacf3e945 242 (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
RodColeman 0:850eacf3e945 243 /* obtain the server address */
RodColeman 0:850eacf3e945 244 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SERVER_ID)) {
RodColeman 0:850eacf3e945 245 ip4_addr_set_u32(&dhcp->server_ip_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SERVER_ID)));
RodColeman 0:850eacf3e945 246 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_handle_offer(): server 0x%08"X32_F"\n",
RodColeman 0:850eacf3e945 247 ip4_addr_get_u32(&dhcp->server_ip_addr)));
RodColeman 0:850eacf3e945 248 /* remember offered address */
RodColeman 0:850eacf3e945 249 ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
RodColeman 0:850eacf3e945 250 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_handle_offer(): offer for 0x%08"X32_F"\n",
RodColeman 0:850eacf3e945 251 ip4_addr_get_u32(&dhcp->offered_ip_addr)));
RodColeman 0:850eacf3e945 252
RodColeman 0:850eacf3e945 253 dhcp_select(netif);
RodColeman 0:850eacf3e945 254 } else {
RodColeman 0:850eacf3e945 255 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
RodColeman 0:850eacf3e945 256 ("dhcp_handle_offer(netif=%p) did not get server ID!\n", (void*)netif));
RodColeman 0:850eacf3e945 257 }
RodColeman 0:850eacf3e945 258 }
RodColeman 0:850eacf3e945 259
RodColeman 0:850eacf3e945 260 /**
RodColeman 0:850eacf3e945 261 * Select a DHCP server offer out of all offers.
RodColeman 0:850eacf3e945 262 *
RodColeman 0:850eacf3e945 263 * Simply select the first offer received.
RodColeman 0:850eacf3e945 264 *
RodColeman 0:850eacf3e945 265 * @param netif the netif under DHCP control
RodColeman 0:850eacf3e945 266 * @return lwIP specific error (see error.h)
RodColeman 0:850eacf3e945 267 */
RodColeman 0:850eacf3e945 268 static err_t
RodColeman 0:850eacf3e945 269 dhcp_select(struct netif *netif)
RodColeman 0:850eacf3e945 270 {
RodColeman 0:850eacf3e945 271 struct dhcp *dhcp = netif->dhcp;
RodColeman 0:850eacf3e945 272 err_t result;
RodColeman 0:850eacf3e945 273 u16_t msecs;
RodColeman 0:850eacf3e945 274
RodColeman 0:850eacf3e945 275 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_select(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
RodColeman 0:850eacf3e945 276 dhcp_set_state(dhcp, DHCP_REQUESTING);
RodColeman 0:850eacf3e945 277
RodColeman 0:850eacf3e945 278 /* create and initialize the DHCP message header */
RodColeman 0:850eacf3e945 279 result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
RodColeman 0:850eacf3e945 280 if (result == ERR_OK) {
RodColeman 0:850eacf3e945 281 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
RodColeman 0:850eacf3e945 282 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
RodColeman 0:850eacf3e945 283
RodColeman 0:850eacf3e945 284 /* MUST request the offered IP address */
RodColeman 0:850eacf3e945 285 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
RodColeman 0:850eacf3e945 286 dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
RodColeman 0:850eacf3e945 287
RodColeman 0:850eacf3e945 288 dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
RodColeman 0:850eacf3e945 289 dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->server_ip_addr)));
RodColeman 0:850eacf3e945 290
RodColeman 0:850eacf3e945 291 dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);
RodColeman 0:850eacf3e945 292 dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
RodColeman 0:850eacf3e945 293 dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
RodColeman 0:850eacf3e945 294 dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
RodColeman 0:850eacf3e945 295 dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
RodColeman 0:850eacf3e945 296
RodColeman 0:850eacf3e945 297 #if LWIP_NETIF_HOSTNAME
RodColeman 0:850eacf3e945 298 if (netif->hostname != NULL) {
RodColeman 0:850eacf3e945 299 const char *p = (const char*)netif->hostname;
RodColeman 0:850eacf3e945 300 u8_t namelen = (u8_t)strlen(p);
RodColeman 0:850eacf3e945 301 if (namelen > 0) {
RodColeman 0:850eacf3e945 302 LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
RodColeman 0:850eacf3e945 303 dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
RodColeman 0:850eacf3e945 304 while (*p) {
RodColeman 0:850eacf3e945 305 dhcp_option_byte(dhcp, *p++);
RodColeman 0:850eacf3e945 306 }
RodColeman 0:850eacf3e945 307 }
RodColeman 0:850eacf3e945 308 }
RodColeman 0:850eacf3e945 309 #endif /* LWIP_NETIF_HOSTNAME */
RodColeman 0:850eacf3e945 310
RodColeman 0:850eacf3e945 311 dhcp_option_trailer(dhcp);
RodColeman 0:850eacf3e945 312 /* shrink the pbuf to the actual content length */
RodColeman 0:850eacf3e945 313 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
RodColeman 0:850eacf3e945 314
RodColeman 0:850eacf3e945 315 /* send broadcast to any DHCP server */
RodColeman 0:850eacf3e945 316 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
RodColeman 0:850eacf3e945 317 dhcp_delete_msg(dhcp);
RodColeman 0:850eacf3e945 318 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_select: REQUESTING\n"));
RodColeman 0:850eacf3e945 319 } else {
RodColeman 0:850eacf3e945 320 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("dhcp_select: could not allocate DHCP request\n"));
RodColeman 0:850eacf3e945 321 }
RodColeman 0:850eacf3e945 322 dhcp->tries++;
RodColeman 0:850eacf3e945 323 msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
RodColeman 0:850eacf3e945 324 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
RodColeman 0:850eacf3e945 325 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_select(): set request timeout %"U16_F" msecs\n", msecs));
RodColeman 0:850eacf3e945 326 return result;
RodColeman 0:850eacf3e945 327 }
RodColeman 0:850eacf3e945 328
RodColeman 0:850eacf3e945 329 /**
RodColeman 0:850eacf3e945 330 * The DHCP timer that checks for lease renewal/rebind timeouts.
RodColeman 0:850eacf3e945 331 */
RodColeman 0:850eacf3e945 332 void
RodColeman 0:850eacf3e945 333 dhcp_coarse_tmr()
RodColeman 0:850eacf3e945 334 {
RodColeman 0:850eacf3e945 335 struct netif *netif = netif_list;
RodColeman 0:850eacf3e945 336 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_coarse_tmr()\n"));
RodColeman 0:850eacf3e945 337 /* iterate through all network interfaces */
RodColeman 0:850eacf3e945 338 while (netif != NULL) {
RodColeman 0:850eacf3e945 339 /* only act on DHCP configured interfaces */
RodColeman 0:850eacf3e945 340 if (netif->dhcp != NULL) {
RodColeman 0:850eacf3e945 341 /* timer is active (non zero), and triggers (zeroes) now? */
RodColeman 0:850eacf3e945 342 if (netif->dhcp->t2_timeout-- == 1) {
RodColeman 0:850eacf3e945 343 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t2 timeout\n"));
RodColeman 0:850eacf3e945 344 /* this clients' rebind timeout triggered */
RodColeman 0:850eacf3e945 345 dhcp_t2_timeout(netif);
RodColeman 0:850eacf3e945 346 /* timer is active (non zero), and triggers (zeroes) now */
RodColeman 0:850eacf3e945 347 } else if (netif->dhcp->t1_timeout-- == 1) {
RodColeman 0:850eacf3e945 348 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t1 timeout\n"));
RodColeman 0:850eacf3e945 349 /* this clients' renewal timeout triggered */
RodColeman 0:850eacf3e945 350 dhcp_t1_timeout(netif);
RodColeman 0:850eacf3e945 351 }
RodColeman 0:850eacf3e945 352 }
RodColeman 0:850eacf3e945 353 /* proceed to next netif */
RodColeman 0:850eacf3e945 354 netif = netif->next;
RodColeman 0:850eacf3e945 355 }
RodColeman 0:850eacf3e945 356 }
RodColeman 0:850eacf3e945 357
RodColeman 0:850eacf3e945 358 /**
RodColeman 0:850eacf3e945 359 * DHCP transaction timeout handling
RodColeman 0:850eacf3e945 360 *
RodColeman 0:850eacf3e945 361 * A DHCP server is expected to respond within a short period of time.
RodColeman 0:850eacf3e945 362 * This timer checks whether an outstanding DHCP request is timed out.
RodColeman 0:850eacf3e945 363 */
RodColeman 0:850eacf3e945 364 void
RodColeman 0:850eacf3e945 365 dhcp_fine_tmr()
RodColeman 0:850eacf3e945 366 {
RodColeman 0:850eacf3e945 367 struct netif *netif = netif_list;
RodColeman 0:850eacf3e945 368 /* loop through netif's */
RodColeman 0:850eacf3e945 369 while (netif != NULL) {
RodColeman 0:850eacf3e945 370 /* only act on DHCP configured interfaces */
RodColeman 0:850eacf3e945 371 if (netif->dhcp != NULL) {
RodColeman 0:850eacf3e945 372 /* timer is active (non zero), and is about to trigger now */
RodColeman 0:850eacf3e945 373 if (netif->dhcp->request_timeout > 1) {
RodColeman 0:850eacf3e945 374 netif->dhcp->request_timeout--;
RodColeman 0:850eacf3e945 375 }
RodColeman 0:850eacf3e945 376 else if (netif->dhcp->request_timeout == 1) {
RodColeman 0:850eacf3e945 377 netif->dhcp->request_timeout--;
RodColeman 0:850eacf3e945 378 /* { netif->dhcp->request_timeout == 0 } */
RodColeman 0:850eacf3e945 379 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_fine_tmr(): request timeout\n"));
RodColeman 0:850eacf3e945 380 /* this client's request timeout triggered */
RodColeman 0:850eacf3e945 381 dhcp_timeout(netif);
RodColeman 0:850eacf3e945 382 }
RodColeman 0:850eacf3e945 383 }
RodColeman 0:850eacf3e945 384 /* proceed to next network interface */
RodColeman 0:850eacf3e945 385 netif = netif->next;
RodColeman 0:850eacf3e945 386 }
RodColeman 0:850eacf3e945 387 }
RodColeman 0:850eacf3e945 388
RodColeman 0:850eacf3e945 389 /**
RodColeman 0:850eacf3e945 390 * A DHCP negotiation transaction, or ARP request, has timed out.
RodColeman 0:850eacf3e945 391 *
RodColeman 0:850eacf3e945 392 * The timer that was started with the DHCP or ARP request has
RodColeman 0:850eacf3e945 393 * timed out, indicating no response was received in time.
RodColeman 0:850eacf3e945 394 *
RodColeman 0:850eacf3e945 395 * @param netif the netif under DHCP control
RodColeman 0:850eacf3e945 396 */
RodColeman 0:850eacf3e945 397 static void
RodColeman 0:850eacf3e945 398 dhcp_timeout(struct netif *netif)
RodColeman 0:850eacf3e945 399 {
RodColeman 0:850eacf3e945 400 struct dhcp *dhcp = netif->dhcp;
RodColeman 0:850eacf3e945 401 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_timeout()\n"));
RodColeman 0:850eacf3e945 402 /* back-off period has passed, or server selection timed out */
RodColeman 0:850eacf3e945 403 if ((dhcp->state == DHCP_BACKING_OFF) || (dhcp->state == DHCP_SELECTING)) {
RodColeman 0:850eacf3e945 404 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_timeout(): restarting discovery\n"));
RodColeman 0:850eacf3e945 405 dhcp_discover(netif);
RodColeman 0:850eacf3e945 406 /* receiving the requested lease timed out */
RodColeman 0:850eacf3e945 407 } else if (dhcp->state == DHCP_REQUESTING) {
RodColeman 0:850eacf3e945 408 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, DHCP request timed out\n"));
RodColeman 0:850eacf3e945 409 if (dhcp->tries <= 5) {
RodColeman 0:850eacf3e945 410 dhcp_select(netif);
RodColeman 0:850eacf3e945 411 } else {
RodColeman 0:850eacf3e945 412 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, releasing, restarting\n"));
RodColeman 0:850eacf3e945 413 dhcp_release(netif);
RodColeman 0:850eacf3e945 414 dhcp_discover(netif);
RodColeman 0:850eacf3e945 415 }
RodColeman 0:850eacf3e945 416 #if DHCP_DOES_ARP_CHECK
RodColeman 0:850eacf3e945 417 /* received no ARP reply for the offered address (which is good) */
RodColeman 0:850eacf3e945 418 } else if (dhcp->state == DHCP_CHECKING) {
RodColeman 0:850eacf3e945 419 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): CHECKING, ARP request timed out\n"));
RodColeman 0:850eacf3e945 420 if (dhcp->tries <= 1) {
RodColeman 0:850eacf3e945 421 dhcp_check(netif);
RodColeman 0:850eacf3e945 422 /* no ARP replies on the offered address,
RodColeman 0:850eacf3e945 423 looks like the IP address is indeed free */
RodColeman 0:850eacf3e945 424 } else {
RodColeman 0:850eacf3e945 425 /* bind the interface to the offered address */
RodColeman 0:850eacf3e945 426 dhcp_bind(netif);
RodColeman 0:850eacf3e945 427 }
RodColeman 0:850eacf3e945 428 #endif /* DHCP_DOES_ARP_CHECK */
RodColeman 0:850eacf3e945 429 }
RodColeman 0:850eacf3e945 430 /* did not get response to renew request? */
RodColeman 0:850eacf3e945 431 else if (dhcp->state == DHCP_RENEWING) {
RodColeman 0:850eacf3e945 432 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): RENEWING, DHCP request timed out\n"));
RodColeman 0:850eacf3e945 433 /* just retry renewal */
RodColeman 0:850eacf3e945 434 /* note that the rebind timer will eventually time-out if renew does not work */
RodColeman 0:850eacf3e945 435 dhcp_renew(netif);
RodColeman 0:850eacf3e945 436 /* did not get response to rebind request? */
RodColeman 0:850eacf3e945 437 } else if (dhcp->state == DHCP_REBINDING) {
RodColeman 0:850eacf3e945 438 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REBINDING, DHCP request timed out\n"));
RodColeman 0:850eacf3e945 439 if (dhcp->tries <= 8) {
RodColeman 0:850eacf3e945 440 dhcp_rebind(netif);
RodColeman 0:850eacf3e945 441 } else {
RodColeman 0:850eacf3e945 442 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): RELEASING, DISCOVERING\n"));
RodColeman 0:850eacf3e945 443 dhcp_release(netif);
RodColeman 0:850eacf3e945 444 dhcp_discover(netif);
RodColeman 0:850eacf3e945 445 }
RodColeman 0:850eacf3e945 446 } else if (dhcp->state == DHCP_REBOOTING) {
RodColeman 0:850eacf3e945 447 if (dhcp->tries < REBOOT_TRIES) {
RodColeman 0:850eacf3e945 448 dhcp_reboot(netif);
RodColeman 0:850eacf3e945 449 } else {
RodColeman 0:850eacf3e945 450 dhcp_discover(netif);
RodColeman 0:850eacf3e945 451 }
RodColeman 0:850eacf3e945 452 }
RodColeman 0:850eacf3e945 453 }
RodColeman 0:850eacf3e945 454
RodColeman 0:850eacf3e945 455 /**
RodColeman 0:850eacf3e945 456 * The renewal period has timed out.
RodColeman 0:850eacf3e945 457 *
RodColeman 0:850eacf3e945 458 * @param netif the netif under DHCP control
RodColeman 0:850eacf3e945 459 */
RodColeman 0:850eacf3e945 460 static void
RodColeman 0:850eacf3e945 461 dhcp_t1_timeout(struct netif *netif)
RodColeman 0:850eacf3e945 462 {
RodColeman 0:850eacf3e945 463 struct dhcp *dhcp = netif->dhcp;
RodColeman 0:850eacf3e945 464 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_t1_timeout()\n"));
RodColeman 0:850eacf3e945 465 if ((dhcp->state == DHCP_REQUESTING) || (dhcp->state == DHCP_BOUND) ||
RodColeman 0:850eacf3e945 466 (dhcp->state == DHCP_RENEWING)) {
RodColeman 0:850eacf3e945 467 /* just retry to renew - note that the rebind timer (t2) will
RodColeman 0:850eacf3e945 468 * eventually time-out if renew tries fail. */
RodColeman 0:850eacf3e945 469 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
RodColeman 0:850eacf3e945 470 ("dhcp_t1_timeout(): must renew\n"));
RodColeman 0:850eacf3e945 471 /* This slightly different to RFC2131: DHCPREQUEST will be sent from state
RodColeman 0:850eacf3e945 472 DHCP_RENEWING, not DHCP_BOUND */
RodColeman 0:850eacf3e945 473 dhcp_renew(netif);
RodColeman 0:850eacf3e945 474 }
RodColeman 0:850eacf3e945 475 }
RodColeman 0:850eacf3e945 476
RodColeman 0:850eacf3e945 477 /**
RodColeman 0:850eacf3e945 478 * The rebind period has timed out.
RodColeman 0:850eacf3e945 479 *
RodColeman 0:850eacf3e945 480 * @param netif the netif under DHCP control
RodColeman 0:850eacf3e945 481 */
RodColeman 0:850eacf3e945 482 static void
RodColeman 0:850eacf3e945 483 dhcp_t2_timeout(struct netif *netif)
RodColeman 0:850eacf3e945 484 {
RodColeman 0:850eacf3e945 485 struct dhcp *dhcp = netif->dhcp;
RodColeman 0:850eacf3e945 486 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_t2_timeout()\n"));
RodColeman 0:850eacf3e945 487 if ((dhcp->state == DHCP_REQUESTING) || (dhcp->state == DHCP_BOUND) ||
RodColeman 0:850eacf3e945 488 (dhcp->state == DHCP_RENEWING)) {
RodColeman 0:850eacf3e945 489 /* just retry to rebind */
RodColeman 0:850eacf3e945 490 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
RodColeman 0:850eacf3e945 491 ("dhcp_t2_timeout(): must rebind\n"));
RodColeman 0:850eacf3e945 492 /* This slightly different to RFC2131: DHCPREQUEST will be sent from state
RodColeman 0:850eacf3e945 493 DHCP_REBINDING, not DHCP_BOUND */
RodColeman 0:850eacf3e945 494 dhcp_rebind(netif);
RodColeman 0:850eacf3e945 495 }
RodColeman 0:850eacf3e945 496 }
RodColeman 0:850eacf3e945 497
RodColeman 0:850eacf3e945 498 /**
RodColeman 0:850eacf3e945 499 * Handle a DHCP ACK packet
RodColeman 0:850eacf3e945 500 *
RodColeman 0:850eacf3e945 501 * @param netif the netif under DHCP control
RodColeman 0:850eacf3e945 502 */
RodColeman 0:850eacf3e945 503 static void
RodColeman 0:850eacf3e945 504 dhcp_handle_ack(struct netif *netif)
RodColeman 0:850eacf3e945 505 {
RodColeman 0:850eacf3e945 506 struct dhcp *dhcp = netif->dhcp;
RodColeman 0:850eacf3e945 507 #if LWIP_DNS
RodColeman 0:850eacf3e945 508 u8_t n;
RodColeman 0:850eacf3e945 509 #endif /* LWIP_DNS */
RodColeman 0:850eacf3e945 510
RodColeman 0:850eacf3e945 511 /* clear options we might not get from the ACK */
RodColeman 0:850eacf3e945 512 ip_addr_set_zero(&dhcp->offered_sn_mask);
RodColeman 0:850eacf3e945 513 ip_addr_set_zero(&dhcp->offered_gw_addr);
RodColeman 0:850eacf3e945 514 #if LWIP_DHCP_BOOTP_FILE
RodColeman 0:850eacf3e945 515 ip_addr_set_zero(&dhcp->offered_si_addr);
RodColeman 0:850eacf3e945 516 #endif /* LWIP_DHCP_BOOTP_FILE */
RodColeman 0:850eacf3e945 517
RodColeman 0:850eacf3e945 518 /* lease time given? */
RodColeman 0:850eacf3e945 519 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_LEASE_TIME)) {
RodColeman 0:850eacf3e945 520 /* remember offered lease time */
RodColeman 0:850eacf3e945 521 dhcp->offered_t0_lease = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_LEASE_TIME);
RodColeman 0:850eacf3e945 522 }
RodColeman 0:850eacf3e945 523 /* renewal period given? */
RodColeman 0:850eacf3e945 524 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T1)) {
RodColeman 0:850eacf3e945 525 /* remember given renewal period */
RodColeman 0:850eacf3e945 526 dhcp->offered_t1_renew = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T1);
RodColeman 0:850eacf3e945 527 } else {
RodColeman 0:850eacf3e945 528 /* calculate safe periods for renewal */
RodColeman 0:850eacf3e945 529 dhcp->offered_t1_renew = dhcp->offered_t0_lease / 2;
RodColeman 0:850eacf3e945 530 }
RodColeman 0:850eacf3e945 531
RodColeman 0:850eacf3e945 532 /* renewal period given? */
RodColeman 0:850eacf3e945 533 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T2)) {
RodColeman 0:850eacf3e945 534 /* remember given rebind period */
RodColeman 0:850eacf3e945 535 dhcp->offered_t2_rebind = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T2);
RodColeman 0:850eacf3e945 536 } else {
RodColeman 0:850eacf3e945 537 /* calculate safe periods for rebinding */
RodColeman 0:850eacf3e945 538 dhcp->offered_t2_rebind = dhcp->offered_t0_lease;
RodColeman 0:850eacf3e945 539 }
RodColeman 0:850eacf3e945 540
RodColeman 0:850eacf3e945 541 /* (y)our internet address */
RodColeman 0:850eacf3e945 542 ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
RodColeman 0:850eacf3e945 543
RodColeman 0:850eacf3e945 544 #if LWIP_DHCP_BOOTP_FILE
RodColeman 0:850eacf3e945 545 /* copy boot server address,
RodColeman 0:850eacf3e945 546 boot file name copied in dhcp_parse_reply if not overloaded */
RodColeman 0:850eacf3e945 547 ip_addr_copy(dhcp->offered_si_addr, dhcp->msg_in->siaddr);
RodColeman 0:850eacf3e945 548 #endif /* LWIP_DHCP_BOOTP_FILE */
RodColeman 0:850eacf3e945 549
RodColeman 0:850eacf3e945 550 /* subnet mask given? */
RodColeman 0:850eacf3e945 551 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)) {
RodColeman 0:850eacf3e945 552 /* remember given subnet mask */
RodColeman 0:850eacf3e945 553 ip4_addr_set_u32(&dhcp->offered_sn_mask, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)));
RodColeman 0:850eacf3e945 554 dhcp->subnet_mask_given = 1;
RodColeman 0:850eacf3e945 555 } else {
RodColeman 0:850eacf3e945 556 dhcp->subnet_mask_given = 0;
RodColeman 0:850eacf3e945 557 }
RodColeman 0:850eacf3e945 558
RodColeman 0:850eacf3e945 559 /* gateway router */
RodColeman 0:850eacf3e945 560 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_ROUTER)) {
RodColeman 0:850eacf3e945 561 ip4_addr_set_u32(&dhcp->offered_gw_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_ROUTER)));
RodColeman 0:850eacf3e945 562 }
RodColeman 0:850eacf3e945 563
RodColeman 0:850eacf3e945 564 #if LWIP_DNS
RodColeman 0:850eacf3e945 565 /* DNS servers */
RodColeman 0:850eacf3e945 566 n = 0;
RodColeman 0:850eacf3e945 567 while(dhcp_option_given(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n) && (n < DNS_MAX_SERVERS)) {
RodColeman 0:850eacf3e945 568 ip_addr_t dns_addr;
RodColeman 0:850eacf3e945 569 ip4_addr_set_u32(&dns_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n)));
RodColeman 0:850eacf3e945 570 dns_setserver(n, &dns_addr);
RodColeman 0:850eacf3e945 571 n++;
RodColeman 0:850eacf3e945 572 }
RodColeman 0:850eacf3e945 573 #endif /* LWIP_DNS */
RodColeman 0:850eacf3e945 574 }
RodColeman 0:850eacf3e945 575
RodColeman 0:850eacf3e945 576 /** Set a statically allocated struct dhcp to work with.
RodColeman 0:850eacf3e945 577 * Using this prevents dhcp_start to allocate it using mem_malloc.
RodColeman 0:850eacf3e945 578 *
RodColeman 0:850eacf3e945 579 * @param netif the netif for which to set the struct dhcp
RodColeman 0:850eacf3e945 580 * @param dhcp (uninitialised) dhcp struct allocated by the application
RodColeman 0:850eacf3e945 581 */
RodColeman 0:850eacf3e945 582 void
RodColeman 0:850eacf3e945 583 dhcp_set_struct(struct netif *netif, struct dhcp *dhcp)
RodColeman 0:850eacf3e945 584 {
RodColeman 0:850eacf3e945 585 LWIP_ASSERT("netif != NULL", netif != NULL);
RodColeman 0:850eacf3e945 586 LWIP_ASSERT("dhcp != NULL", dhcp != NULL);
RodColeman 0:850eacf3e945 587 LWIP_ASSERT("netif already has a struct dhcp set", netif->dhcp == NULL);
RodColeman 0:850eacf3e945 588
RodColeman 0:850eacf3e945 589 /* clear data structure */
RodColeman 0:850eacf3e945 590 memset(dhcp, 0, sizeof(struct dhcp));
RodColeman 0:850eacf3e945 591 /* dhcp_set_state(&dhcp, DHCP_OFF); */
RodColeman 0:850eacf3e945 592 netif->dhcp = dhcp;
RodColeman 0:850eacf3e945 593 }
RodColeman 0:850eacf3e945 594
RodColeman 0:850eacf3e945 595 /**
RodColeman 0:850eacf3e945 596 * Start DHCP negotiation for a network interface.
RodColeman 0:850eacf3e945 597 *
RodColeman 0:850eacf3e945 598 * If no DHCP client instance was attached to this interface,
RodColeman 0:850eacf3e945 599 * a new client is created first. If a DHCP client instance
RodColeman 0:850eacf3e945 600 * was already present, it restarts negotiation.
RodColeman 0:850eacf3e945 601 *
RodColeman 0:850eacf3e945 602 * @param netif The lwIP network interface
RodColeman 0:850eacf3e945 603 * @return lwIP error code
RodColeman 0:850eacf3e945 604 * - ERR_OK - No error
RodColeman 0:850eacf3e945 605 * - ERR_MEM - Out of memory
RodColeman 0:850eacf3e945 606 */
RodColeman 0:850eacf3e945 607 err_t
RodColeman 0:850eacf3e945 608 dhcp_start(struct netif *netif)
RodColeman 0:850eacf3e945 609 {
RodColeman 0:850eacf3e945 610 struct dhcp *dhcp;
RodColeman 0:850eacf3e945 611 err_t result = ERR_OK;
RodColeman 0:850eacf3e945 612
RodColeman 0:850eacf3e945 613 LWIP_ERROR("netif != NULL", (netif != NULL), return ERR_ARG;);
RodColeman 0:850eacf3e945 614 dhcp = netif->dhcp;
RodColeman 0:850eacf3e945 615 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_start(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
RodColeman 0:850eacf3e945 616 /* Remove the flag that says this netif is handled by DHCP,
RodColeman 0:850eacf3e945 617 it is set when we succeeded starting. */
RodColeman 0:850eacf3e945 618 netif->flags &= ~NETIF_FLAG_DHCP;
RodColeman 0:850eacf3e945 619
RodColeman 0:850eacf3e945 620 /* check hwtype of the netif */
RodColeman 0:850eacf3e945 621 if ((netif->flags & NETIF_FLAG_ETHARP) == 0) {
RodColeman 0:850eacf3e945 622 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): No ETHARP netif\n"));
RodColeman 0:850eacf3e945 623 return ERR_ARG;
RodColeman 0:850eacf3e945 624 }
RodColeman 0:850eacf3e945 625
RodColeman 0:850eacf3e945 626 /* check MTU of the netif */
RodColeman 0:850eacf3e945 627 if (netif->mtu < DHCP_MAX_MSG_LEN_MIN_REQUIRED) {
RodColeman 0:850eacf3e945 628 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): Cannot use this netif with DHCP: MTU is too small\n"));
RodColeman 0:850eacf3e945 629 return ERR_MEM;
RodColeman 0:850eacf3e945 630 }
RodColeman 0:850eacf3e945 631
RodColeman 0:850eacf3e945 632 /* no DHCP client attached yet? */
RodColeman 0:850eacf3e945 633 if (dhcp == NULL) {
RodColeman 0:850eacf3e945 634 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): starting new DHCP client\n"));
RodColeman 0:850eacf3e945 635 dhcp = (struct dhcp *)mem_malloc(sizeof(struct dhcp));
RodColeman 0:850eacf3e945 636 if (dhcp == NULL) {
RodColeman 0:850eacf3e945 637 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): could not allocate dhcp\n"));
RodColeman 0:850eacf3e945 638 return ERR_MEM;
RodColeman 0:850eacf3e945 639 }
RodColeman 0:850eacf3e945 640 /* store this dhcp client in the netif */
RodColeman 0:850eacf3e945 641 netif->dhcp = dhcp;
RodColeman 0:850eacf3e945 642 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): allocated dhcp"));
RodColeman 0:850eacf3e945 643 /* already has DHCP client attached */
RodColeman 0:850eacf3e945 644 } else {
RodColeman 0:850eacf3e945 645 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_start(): restarting DHCP configuration\n"));
RodColeman 0:850eacf3e945 646 if (dhcp->pcb != NULL) {
RodColeman 0:850eacf3e945 647 udp_remove(dhcp->pcb);
RodColeman 0:850eacf3e945 648 }
RodColeman 0:850eacf3e945 649 LWIP_ASSERT("pbuf p_out wasn't freed", dhcp->p_out == NULL);
RodColeman 0:850eacf3e945 650 LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL );
RodColeman 0:850eacf3e945 651 }
RodColeman 0:850eacf3e945 652
RodColeman 0:850eacf3e945 653 /* clear data structure */
RodColeman 0:850eacf3e945 654 memset(dhcp, 0, sizeof(struct dhcp));
RodColeman 0:850eacf3e945 655 /* dhcp_set_state(&dhcp, DHCP_OFF); */
RodColeman 0:850eacf3e945 656 /* allocate UDP PCB */
RodColeman 0:850eacf3e945 657 dhcp->pcb = udp_new();
RodColeman 0:850eacf3e945 658 if (dhcp->pcb == NULL) {
RodColeman 0:850eacf3e945 659 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): could not obtain pcb\n"));
RodColeman 0:850eacf3e945 660 return ERR_MEM;
RodColeman 0:850eacf3e945 661 }
RodColeman 0:850eacf3e945 662 dhcp->pcb->so_options |= SOF_BROADCAST;
RodColeman 0:850eacf3e945 663 /* set up local and remote port for the pcb */
RodColeman 0:850eacf3e945 664 udp_bind(dhcp->pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
RodColeman 0:850eacf3e945 665 udp_connect(dhcp->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
RodColeman 0:850eacf3e945 666 /* set up the recv callback and argument */
RodColeman 0:850eacf3e945 667 udp_recv(dhcp->pcb, dhcp_recv, netif);
RodColeman 0:850eacf3e945 668 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): starting DHCP configuration\n"));
RodColeman 0:850eacf3e945 669 /* (re)start the DHCP negotiation */
RodColeman 0:850eacf3e945 670 result = dhcp_discover(netif);
RodColeman 0:850eacf3e945 671 if (result != ERR_OK) {
RodColeman 0:850eacf3e945 672 /* free resources allocated above */
RodColeman 0:850eacf3e945 673 dhcp_stop(netif);
RodColeman 0:850eacf3e945 674 return ERR_MEM;
RodColeman 0:850eacf3e945 675 }
RodColeman 0:850eacf3e945 676 /* Set the flag that says this netif is handled by DHCP. */
RodColeman 0:850eacf3e945 677 netif->flags |= NETIF_FLAG_DHCP;
RodColeman 0:850eacf3e945 678 return result;
RodColeman 0:850eacf3e945 679 }
RodColeman 0:850eacf3e945 680
RodColeman 0:850eacf3e945 681 /**
RodColeman 0:850eacf3e945 682 * Inform a DHCP server of our manual configuration.
RodColeman 0:850eacf3e945 683 *
RodColeman 0:850eacf3e945 684 * This informs DHCP servers of our fixed IP address configuration
RodColeman 0:850eacf3e945 685 * by sending an INFORM message. It does not involve DHCP address
RodColeman 0:850eacf3e945 686 * configuration, it is just here to be nice to the network.
RodColeman 0:850eacf3e945 687 *
RodColeman 0:850eacf3e945 688 * @param netif The lwIP network interface
RodColeman 0:850eacf3e945 689 */
RodColeman 0:850eacf3e945 690 void
RodColeman 0:850eacf3e945 691 dhcp_inform(struct netif *netif)
RodColeman 0:850eacf3e945 692 {
RodColeman 0:850eacf3e945 693 struct dhcp dhcp;
RodColeman 0:850eacf3e945 694 err_t result = ERR_OK;
RodColeman 0:850eacf3e945 695 struct udp_pcb *pcb;
RodColeman 0:850eacf3e945 696
RodColeman 0:850eacf3e945 697 LWIP_ERROR("netif != NULL", (netif != NULL), return;);
RodColeman 0:850eacf3e945 698
RodColeman 0:850eacf3e945 699 memset(&dhcp, 0, sizeof(struct dhcp));
RodColeman 0:850eacf3e945 700 dhcp_set_state(&dhcp, DHCP_INFORM);
RodColeman 0:850eacf3e945 701
RodColeman 0:850eacf3e945 702 if ((netif->dhcp != NULL) && (netif->dhcp->pcb != NULL)) {
RodColeman 0:850eacf3e945 703 /* re-use existing pcb */
RodColeman 0:850eacf3e945 704 pcb = netif->dhcp->pcb;
RodColeman 0:850eacf3e945 705 } else {
RodColeman 0:850eacf3e945 706 pcb = udp_new();
RodColeman 0:850eacf3e945 707 if (pcb == NULL) {
RodColeman 0:850eacf3e945 708 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform(): could not obtain pcb"));
RodColeman 0:850eacf3e945 709 return;
RodColeman 0:850eacf3e945 710 }
RodColeman 0:850eacf3e945 711 dhcp.pcb = pcb;
RodColeman 0:850eacf3e945 712 dhcp.pcb->so_options |= SOF_BROADCAST;
RodColeman 0:850eacf3e945 713 udp_bind(dhcp.pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
RodColeman 0:850eacf3e945 714 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_inform(): created new udp pcb\n"));
RodColeman 0:850eacf3e945 715 }
RodColeman 0:850eacf3e945 716 /* create and initialize the DHCP message header */
RodColeman 0:850eacf3e945 717 result = dhcp_create_msg(netif, &dhcp, DHCP_INFORM);
RodColeman 0:850eacf3e945 718 if (result == ERR_OK) {
RodColeman 0:850eacf3e945 719 dhcp_option(&dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
RodColeman 0:850eacf3e945 720 dhcp_option_short(&dhcp, DHCP_MAX_MSG_LEN(netif));
RodColeman 0:850eacf3e945 721
RodColeman 0:850eacf3e945 722 dhcp_option_trailer(&dhcp);
RodColeman 0:850eacf3e945 723
RodColeman 0:850eacf3e945 724 pbuf_realloc(dhcp.p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp.options_out_len);
RodColeman 0:850eacf3e945 725
RodColeman 0:850eacf3e945 726 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_inform: INFORMING\n"));
RodColeman 0:850eacf3e945 727 udp_sendto_if(pcb, dhcp.p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
RodColeman 0:850eacf3e945 728 dhcp_delete_msg(&dhcp);
RodColeman 0:850eacf3e945 729 } else {
RodColeman 0:850eacf3e945 730 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform: could not allocate DHCP request\n"));
RodColeman 0:850eacf3e945 731 }
RodColeman 0:850eacf3e945 732
RodColeman 0:850eacf3e945 733 if (dhcp.pcb != NULL) {
RodColeman 0:850eacf3e945 734 /* otherwise, the existing pcb was used */
RodColeman 0:850eacf3e945 735 udp_remove(dhcp.pcb);
RodColeman 0:850eacf3e945 736 }
RodColeman 0:850eacf3e945 737 }
RodColeman 0:850eacf3e945 738
RodColeman 0:850eacf3e945 739 /** Handle a possible change in the network configuration.
RodColeman 0:850eacf3e945 740 *
RodColeman 0:850eacf3e945 741 * This enters the REBOOTING state to verify that the currently bound
RodColeman 0:850eacf3e945 742 * address is still valid.
RodColeman 0:850eacf3e945 743 */
RodColeman 0:850eacf3e945 744 void
RodColeman 0:850eacf3e945 745 dhcp_network_changed(struct netif *netif)
RodColeman 0:850eacf3e945 746 {
RodColeman 0:850eacf3e945 747 struct dhcp *dhcp = netif->dhcp;
RodColeman 0:850eacf3e945 748 if (!dhcp)
RodColeman 0:850eacf3e945 749 return;
RodColeman 0:850eacf3e945 750 switch (dhcp->state) {
RodColeman 0:850eacf3e945 751 case DHCP_REBINDING:
RodColeman 0:850eacf3e945 752 case DHCP_RENEWING:
RodColeman 0:850eacf3e945 753 case DHCP_BOUND:
RodColeman 0:850eacf3e945 754 case DHCP_REBOOTING:
RodColeman 0:850eacf3e945 755 netif_set_down(netif);
RodColeman 0:850eacf3e945 756 dhcp->tries = 0;
RodColeman 0:850eacf3e945 757 dhcp_reboot(netif);
RodColeman 0:850eacf3e945 758 break;
RodColeman 0:850eacf3e945 759 case DHCP_OFF:
RodColeman 0:850eacf3e945 760 /* stay off */
RodColeman 0:850eacf3e945 761 break;
RodColeman 0:850eacf3e945 762 default:
RodColeman 0:850eacf3e945 763 dhcp->tries = 0;
RodColeman 0:850eacf3e945 764 #if LWIP_DHCP_AUTOIP_COOP
RodColeman 0:850eacf3e945 765 dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
RodColeman 0:850eacf3e945 766 #endif /* LWIP_DHCP_AUTOIP_COOP */
RodColeman 0:850eacf3e945 767 dhcp_discover(netif);
RodColeman 0:850eacf3e945 768 break;
RodColeman 0:850eacf3e945 769 }
RodColeman 0:850eacf3e945 770 }
RodColeman 0:850eacf3e945 771
RodColeman 0:850eacf3e945 772 #if DHCP_DOES_ARP_CHECK
RodColeman 0:850eacf3e945 773 /**
RodColeman 0:850eacf3e945 774 * Match an ARP reply with the offered IP address.
RodColeman 0:850eacf3e945 775 *
RodColeman 0:850eacf3e945 776 * @param netif the network interface on which the reply was received
RodColeman 0:850eacf3e945 777 * @param addr The IP address we received a reply from
RodColeman 0:850eacf3e945 778 */
RodColeman 0:850eacf3e945 779 void dhcp_arp_reply(struct netif *netif, ip_addr_t *addr)
RodColeman 0:850eacf3e945 780 {
RodColeman 0:850eacf3e945 781 LWIP_ERROR("netif != NULL", (netif != NULL), return;);
RodColeman 0:850eacf3e945 782 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_arp_reply()\n"));
RodColeman 0:850eacf3e945 783 /* is a DHCP client doing an ARP check? */
RodColeman 0:850eacf3e945 784 if ((netif->dhcp != NULL) && (netif->dhcp->state == DHCP_CHECKING)) {
RodColeman 0:850eacf3e945 785 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_arp_reply(): CHECKING, arp reply for 0x%08"X32_F"\n",
RodColeman 0:850eacf3e945 786 ip4_addr_get_u32(addr)));
RodColeman 0:850eacf3e945 787 /* did a host respond with the address we
RodColeman 0:850eacf3e945 788 were offered by the DHCP server? */
RodColeman 0:850eacf3e945 789 if (ip_addr_cmp(addr, &netif->dhcp->offered_ip_addr)) {
RodColeman 0:850eacf3e945 790 /* we will not accept the offered address */
RodColeman 0:850eacf3e945 791 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING,
RodColeman 0:850eacf3e945 792 ("dhcp_arp_reply(): arp reply matched with offered address, declining\n"));
RodColeman 0:850eacf3e945 793 dhcp_decline(netif);
RodColeman 0:850eacf3e945 794 }
RodColeman 0:850eacf3e945 795 }
RodColeman 0:850eacf3e945 796 }
RodColeman 0:850eacf3e945 797
RodColeman 0:850eacf3e945 798 /**
RodColeman 0:850eacf3e945 799 * Decline an offered lease.
RodColeman 0:850eacf3e945 800 *
RodColeman 0:850eacf3e945 801 * Tell the DHCP server we do not accept the offered address.
RodColeman 0:850eacf3e945 802 * One reason to decline the lease is when we find out the address
RodColeman 0:850eacf3e945 803 * is already in use by another host (through ARP).
RodColeman 0:850eacf3e945 804 *
RodColeman 0:850eacf3e945 805 * @param netif the netif under DHCP control
RodColeman 0:850eacf3e945 806 */
RodColeman 0:850eacf3e945 807 static err_t
RodColeman 0:850eacf3e945 808 dhcp_decline(struct netif *netif)
RodColeman 0:850eacf3e945 809 {
RodColeman 0:850eacf3e945 810 struct dhcp *dhcp = netif->dhcp;
RodColeman 0:850eacf3e945 811 err_t result = ERR_OK;
RodColeman 0:850eacf3e945 812 u16_t msecs;
RodColeman 0:850eacf3e945 813 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_decline()\n"));
RodColeman 0:850eacf3e945 814 dhcp_set_state(dhcp, DHCP_BACKING_OFF);
RodColeman 0:850eacf3e945 815 /* create and initialize the DHCP message header */
RodColeman 0:850eacf3e945 816 result = dhcp_create_msg(netif, dhcp, DHCP_DECLINE);
RodColeman 0:850eacf3e945 817 if (result == ERR_OK) {
RodColeman 0:850eacf3e945 818 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
RodColeman 0:850eacf3e945 819 dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
RodColeman 0:850eacf3e945 820
RodColeman 0:850eacf3e945 821 dhcp_option_trailer(dhcp);
RodColeman 0:850eacf3e945 822 /* resize pbuf to reflect true size of options */
RodColeman 0:850eacf3e945 823 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
RodColeman 0:850eacf3e945 824
RodColeman 0:850eacf3e945 825 /* per section 4.4.4, broadcast DECLINE messages */
RodColeman 0:850eacf3e945 826 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
RodColeman 0:850eacf3e945 827 dhcp_delete_msg(dhcp);
RodColeman 0:850eacf3e945 828 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_decline: BACKING OFF\n"));
RodColeman 0:850eacf3e945 829 } else {
RodColeman 0:850eacf3e945 830 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
RodColeman 0:850eacf3e945 831 ("dhcp_decline: could not allocate DHCP request\n"));
RodColeman 0:850eacf3e945 832 }
RodColeman 0:850eacf3e945 833 dhcp->tries++;
RodColeman 0:850eacf3e945 834 msecs = 10*1000;
RodColeman 0:850eacf3e945 835 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
RodColeman 0:850eacf3e945 836 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_decline(): set request timeout %"U16_F" msecs\n", msecs));
RodColeman 0:850eacf3e945 837 return result;
RodColeman 0:850eacf3e945 838 }
RodColeman 0:850eacf3e945 839 #endif /* DHCP_DOES_ARP_CHECK */
RodColeman 0:850eacf3e945 840
RodColeman 0:850eacf3e945 841
RodColeman 0:850eacf3e945 842 /**
RodColeman 0:850eacf3e945 843 * Start the DHCP process, discover a DHCP server.
RodColeman 0:850eacf3e945 844 *
RodColeman 0:850eacf3e945 845 * @param netif the netif under DHCP control
RodColeman 0:850eacf3e945 846 */
RodColeman 0:850eacf3e945 847 static err_t
RodColeman 0:850eacf3e945 848 dhcp_discover(struct netif *netif)
RodColeman 0:850eacf3e945 849 {
RodColeman 0:850eacf3e945 850 struct dhcp *dhcp = netif->dhcp;
RodColeman 0:850eacf3e945 851 err_t result = ERR_OK;
RodColeman 0:850eacf3e945 852 u16_t msecs;
RodColeman 0:850eacf3e945 853 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover()\n"));
RodColeman 0:850eacf3e945 854 ip_addr_set_any(&dhcp->offered_ip_addr);
RodColeman 0:850eacf3e945 855 dhcp_set_state(dhcp, DHCP_SELECTING);
RodColeman 0:850eacf3e945 856 /* create and initialize the DHCP message header */
RodColeman 0:850eacf3e945 857 result = dhcp_create_msg(netif, dhcp, DHCP_DISCOVER);
RodColeman 0:850eacf3e945 858 if (result == ERR_OK) {
RodColeman 0:850eacf3e945 859 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: making request\n"));
RodColeman 0:850eacf3e945 860
RodColeman 0:850eacf3e945 861 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
RodColeman 0:850eacf3e945 862 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
RodColeman 0:850eacf3e945 863
RodColeman 0:850eacf3e945 864 dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);
RodColeman 0:850eacf3e945 865 dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
RodColeman 0:850eacf3e945 866 dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
RodColeman 0:850eacf3e945 867 dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
RodColeman 0:850eacf3e945 868 dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
RodColeman 0:850eacf3e945 869
RodColeman 0:850eacf3e945 870 dhcp_option_trailer(dhcp);
RodColeman 0:850eacf3e945 871
RodColeman 0:850eacf3e945 872 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: realloc()ing\n"));
RodColeman 0:850eacf3e945 873 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
RodColeman 0:850eacf3e945 874
RodColeman 0:850eacf3e945 875 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: sendto(DISCOVER, IP_ADDR_BROADCAST, DHCP_SERVER_PORT)\n"));
RodColeman 0:850eacf3e945 876 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
RodColeman 0:850eacf3e945 877 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: deleting()ing\n"));
RodColeman 0:850eacf3e945 878 dhcp_delete_msg(dhcp);
RodColeman 0:850eacf3e945 879 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_discover: SELECTING\n"));
RodColeman 0:850eacf3e945 880 } else {
RodColeman 0:850eacf3e945 881 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_discover: could not allocate DHCP request\n"));
RodColeman 0:850eacf3e945 882 }
RodColeman 0:850eacf3e945 883 dhcp->tries++;
RodColeman 0:850eacf3e945 884 #if LWIP_DHCP_AUTOIP_COOP
RodColeman 0:850eacf3e945 885 if(dhcp->tries >= LWIP_DHCP_AUTOIP_COOP_TRIES && dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_OFF) {
RodColeman 0:850eacf3e945 886 dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_ON;
RodColeman 0:850eacf3e945 887 autoip_start(netif);
RodColeman 0:850eacf3e945 888 }
RodColeman 0:850eacf3e945 889 #endif /* LWIP_DHCP_AUTOIP_COOP */
RodColeman 0:850eacf3e945 890 msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
RodColeman 0:850eacf3e945 891 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
RodColeman 0:850eacf3e945 892 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_discover(): set request timeout %"U16_F" msecs\n", msecs));
RodColeman 0:850eacf3e945 893 return result;
RodColeman 0:850eacf3e945 894 }
RodColeman 0:850eacf3e945 895
RodColeman 0:850eacf3e945 896
RodColeman 0:850eacf3e945 897 /**
RodColeman 0:850eacf3e945 898 * Bind the interface to the offered IP address.
RodColeman 0:850eacf3e945 899 *
RodColeman 0:850eacf3e945 900 * @param netif network interface to bind to the offered address
RodColeman 0:850eacf3e945 901 */
RodColeman 0:850eacf3e945 902 static void
RodColeman 0:850eacf3e945 903 dhcp_bind(struct netif *netif)
RodColeman 0:850eacf3e945 904 {
RodColeman 0:850eacf3e945 905 u32_t timeout;
RodColeman 0:850eacf3e945 906 struct dhcp *dhcp;
RodColeman 0:850eacf3e945 907 ip_addr_t sn_mask, gw_addr;
RodColeman 0:850eacf3e945 908 LWIP_ERROR("dhcp_bind: netif != NULL", (netif != NULL), return;);
RodColeman 0:850eacf3e945 909 dhcp = netif->dhcp;
RodColeman 0:850eacf3e945 910 LWIP_ERROR("dhcp_bind: dhcp != NULL", (dhcp != NULL), return;);
RodColeman 0:850eacf3e945 911 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
RodColeman 0:850eacf3e945 912
RodColeman 0:850eacf3e945 913 /* temporary DHCP lease? */
RodColeman 0:850eacf3e945 914 if (dhcp->offered_t1_renew != 0xffffffffUL) {
RodColeman 0:850eacf3e945 915 /* set renewal period timer */
RodColeman 0:850eacf3e945 916 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(): t1 renewal timer %"U32_F" secs\n", dhcp->offered_t1_renew));
RodColeman 0:850eacf3e945 917 timeout = (dhcp->offered_t1_renew + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
RodColeman 0:850eacf3e945 918 if(timeout > 0xffff) {
RodColeman 0:850eacf3e945 919 timeout = 0xffff;
RodColeman 0:850eacf3e945 920 }
RodColeman 0:850eacf3e945 921 dhcp->t1_timeout = (u16_t)timeout;
RodColeman 0:850eacf3e945 922 if (dhcp->t1_timeout == 0) {
RodColeman 0:850eacf3e945 923 dhcp->t1_timeout = 1;
RodColeman 0:850eacf3e945 924 }
RodColeman 0:850eacf3e945 925 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_bind(): set request timeout %"U32_F" msecs\n", dhcp->offered_t1_renew*1000));
RodColeman 0:850eacf3e945 926 }
RodColeman 0:850eacf3e945 927 /* set renewal period timer */
RodColeman 0:850eacf3e945 928 if (dhcp->offered_t2_rebind != 0xffffffffUL) {
RodColeman 0:850eacf3e945 929 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(): t2 rebind timer %"U32_F" secs\n", dhcp->offered_t2_rebind));
RodColeman 0:850eacf3e945 930 timeout = (dhcp->offered_t2_rebind + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
RodColeman 0:850eacf3e945 931 if(timeout > 0xffff) {
RodColeman 0:850eacf3e945 932 timeout = 0xffff;
RodColeman 0:850eacf3e945 933 }
RodColeman 0:850eacf3e945 934 dhcp->t2_timeout = (u16_t)timeout;
RodColeman 0:850eacf3e945 935 if (dhcp->t2_timeout == 0) {
RodColeman 0:850eacf3e945 936 dhcp->t2_timeout = 1;
RodColeman 0:850eacf3e945 937 }
RodColeman 0:850eacf3e945 938 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_bind(): set request timeout %"U32_F" msecs\n", dhcp->offered_t2_rebind*1000));
RodColeman 0:850eacf3e945 939 }
RodColeman 0:850eacf3e945 940
RodColeman 0:850eacf3e945 941 if (dhcp->subnet_mask_given) {
RodColeman 0:850eacf3e945 942 /* copy offered network mask */
RodColeman 0:850eacf3e945 943 ip_addr_copy(sn_mask, dhcp->offered_sn_mask);
RodColeman 0:850eacf3e945 944 } else {
RodColeman 0:850eacf3e945 945 /* subnet mask not given, choose a safe subnet mask given the network class */
RodColeman 0:850eacf3e945 946 u8_t first_octet = ip4_addr1(&dhcp->offered_ip_addr);
RodColeman 0:850eacf3e945 947 if (first_octet <= 127) {
RodColeman 0:850eacf3e945 948 ip4_addr_set_u32(&sn_mask, PP_HTONL(0xff000000));
RodColeman 0:850eacf3e945 949 } else if (first_octet >= 192) {
RodColeman 0:850eacf3e945 950 ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffffff00));
RodColeman 0:850eacf3e945 951 } else {
RodColeman 0:850eacf3e945 952 ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffff0000));
RodColeman 0:850eacf3e945 953 }
RodColeman 0:850eacf3e945 954 }
RodColeman 0:850eacf3e945 955
RodColeman 0:850eacf3e945 956 ip_addr_copy(gw_addr, dhcp->offered_gw_addr);
RodColeman 0:850eacf3e945 957 /* gateway address not given? */
RodColeman 0:850eacf3e945 958 if (ip_addr_isany(&gw_addr)) {
RodColeman 0:850eacf3e945 959 /* copy network address */
RodColeman 0:850eacf3e945 960 ip_addr_get_network(&gw_addr, &dhcp->offered_ip_addr, &sn_mask);
RodColeman 0:850eacf3e945 961 /* use first host address on network as gateway */
RodColeman 0:850eacf3e945 962 ip4_addr_set_u32(&gw_addr, ip4_addr_get_u32(&gw_addr) | PP_HTONL(0x00000001));
RodColeman 0:850eacf3e945 963 }
RodColeman 0:850eacf3e945 964
RodColeman 0:850eacf3e945 965 #if LWIP_DHCP_AUTOIP_COOP
RodColeman 0:850eacf3e945 966 if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
RodColeman 0:850eacf3e945 967 autoip_stop(netif);
RodColeman 0:850eacf3e945 968 dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
RodColeman 0:850eacf3e945 969 }
RodColeman 0:850eacf3e945 970 #endif /* LWIP_DHCP_AUTOIP_COOP */
RodColeman 0:850eacf3e945 971
RodColeman 0:850eacf3e945 972 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): IP: 0x%08"X32_F"\n",
RodColeman 0:850eacf3e945 973 ip4_addr_get_u32(&dhcp->offered_ip_addr)));
RodColeman 0:850eacf3e945 974 netif_set_ipaddr(netif, &dhcp->offered_ip_addr);
RodColeman 0:850eacf3e945 975 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): SN: 0x%08"X32_F"\n",
RodColeman 0:850eacf3e945 976 ip4_addr_get_u32(&sn_mask)));
RodColeman 0:850eacf3e945 977 netif_set_netmask(netif, &sn_mask);
RodColeman 0:850eacf3e945 978 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): GW: 0x%08"X32_F"\n",
RodColeman 0:850eacf3e945 979 ip4_addr_get_u32(&gw_addr)));
RodColeman 0:850eacf3e945 980 netif_set_gw(netif, &gw_addr);
RodColeman 0:850eacf3e945 981 /* bring the interface up */
RodColeman 0:850eacf3e945 982 netif_set_up(netif);
RodColeman 0:850eacf3e945 983 /* netif is now bound to DHCP leased address */
RodColeman 0:850eacf3e945 984 dhcp_set_state(dhcp, DHCP_BOUND);
RodColeman 0:850eacf3e945 985 }
RodColeman 0:850eacf3e945 986
RodColeman 0:850eacf3e945 987 /**
RodColeman 0:850eacf3e945 988 * Renew an existing DHCP lease at the involved DHCP server.
RodColeman 0:850eacf3e945 989 *
RodColeman 0:850eacf3e945 990 * @param netif network interface which must renew its lease
RodColeman 0:850eacf3e945 991 */
RodColeman 0:850eacf3e945 992 err_t
RodColeman 0:850eacf3e945 993 dhcp_renew(struct netif *netif)
RodColeman 0:850eacf3e945 994 {
RodColeman 0:850eacf3e945 995 struct dhcp *dhcp = netif->dhcp;
RodColeman 0:850eacf3e945 996 err_t result;
RodColeman 0:850eacf3e945 997 u16_t msecs;
RodColeman 0:850eacf3e945 998 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_renew()\n"));
RodColeman 0:850eacf3e945 999 dhcp_set_state(dhcp, DHCP_RENEWING);
RodColeman 0:850eacf3e945 1000
RodColeman 0:850eacf3e945 1001 /* create and initialize the DHCP message header */
RodColeman 0:850eacf3e945 1002 result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
RodColeman 0:850eacf3e945 1003 if (result == ERR_OK) {
RodColeman 0:850eacf3e945 1004 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
RodColeman 0:850eacf3e945 1005 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
RodColeman 0:850eacf3e945 1006
RodColeman 0:850eacf3e945 1007 #if LWIP_NETIF_HOSTNAME
RodColeman 0:850eacf3e945 1008 if (netif->hostname != NULL) {
RodColeman 0:850eacf3e945 1009 const char *p = (const char*)netif->hostname;
RodColeman 0:850eacf3e945 1010 u8_t namelen = (u8_t)strlen(p);
RodColeman 0:850eacf3e945 1011 if (namelen > 0) {
RodColeman 0:850eacf3e945 1012 LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
RodColeman 0:850eacf3e945 1013 dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
RodColeman 0:850eacf3e945 1014 while (*p) {
RodColeman 0:850eacf3e945 1015 dhcp_option_byte(dhcp, *p++);
RodColeman 0:850eacf3e945 1016 }
RodColeman 0:850eacf3e945 1017 }
RodColeman 0:850eacf3e945 1018 }
RodColeman 0:850eacf3e945 1019 #endif /* LWIP_NETIF_HOSTNAME */
RodColeman 0:850eacf3e945 1020
RodColeman 0:850eacf3e945 1021 #if 0
RodColeman 0:850eacf3e945 1022 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
RodColeman 0:850eacf3e945 1023 dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
RodColeman 0:850eacf3e945 1024 #endif
RodColeman 0:850eacf3e945 1025
RodColeman 0:850eacf3e945 1026 #if 0
RodColeman 0:850eacf3e945 1027 dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
RodColeman 0:850eacf3e945 1028 dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
RodColeman 0:850eacf3e945 1029 #endif
RodColeman 0:850eacf3e945 1030 /* append DHCP message trailer */
RodColeman 0:850eacf3e945 1031 dhcp_option_trailer(dhcp);
RodColeman 0:850eacf3e945 1032
RodColeman 0:850eacf3e945 1033 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
RodColeman 0:850eacf3e945 1034
RodColeman 0:850eacf3e945 1035 udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
RodColeman 0:850eacf3e945 1036 dhcp_delete_msg(dhcp);
RodColeman 0:850eacf3e945 1037
RodColeman 0:850eacf3e945 1038 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_renew: RENEWING\n"));
RodColeman 0:850eacf3e945 1039 } else {
RodColeman 0:850eacf3e945 1040 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_renew: could not allocate DHCP request\n"));
RodColeman 0:850eacf3e945 1041 }
RodColeman 0:850eacf3e945 1042 dhcp->tries++;
RodColeman 0:850eacf3e945 1043 /* back-off on retries, but to a maximum of 20 seconds */
RodColeman 0:850eacf3e945 1044 msecs = dhcp->tries < 10 ? dhcp->tries * 2000 : 20 * 1000;
RodColeman 0:850eacf3e945 1045 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
RodColeman 0:850eacf3e945 1046 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_renew(): set request timeout %"U16_F" msecs\n", msecs));
RodColeman 0:850eacf3e945 1047 return result;
RodColeman 0:850eacf3e945 1048 }
RodColeman 0:850eacf3e945 1049
RodColeman 0:850eacf3e945 1050 /**
RodColeman 0:850eacf3e945 1051 * Rebind with a DHCP server for an existing DHCP lease.
RodColeman 0:850eacf3e945 1052 *
RodColeman 0:850eacf3e945 1053 * @param netif network interface which must rebind with a DHCP server
RodColeman 0:850eacf3e945 1054 */
RodColeman 0:850eacf3e945 1055 static err_t
RodColeman 0:850eacf3e945 1056 dhcp_rebind(struct netif *netif)
RodColeman 0:850eacf3e945 1057 {
RodColeman 0:850eacf3e945 1058 struct dhcp *dhcp = netif->dhcp;
RodColeman 0:850eacf3e945 1059 err_t result;
RodColeman 0:850eacf3e945 1060 u16_t msecs;
RodColeman 0:850eacf3e945 1061 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind()\n"));
RodColeman 0:850eacf3e945 1062 dhcp_set_state(dhcp, DHCP_REBINDING);
RodColeman 0:850eacf3e945 1063
RodColeman 0:850eacf3e945 1064 /* create and initialize the DHCP message header */
RodColeman 0:850eacf3e945 1065 result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
RodColeman 0:850eacf3e945 1066 if (result == ERR_OK) {
RodColeman 0:850eacf3e945 1067 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
RodColeman 0:850eacf3e945 1068 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
RodColeman 0:850eacf3e945 1069
RodColeman 0:850eacf3e945 1070 #if LWIP_NETIF_HOSTNAME
RodColeman 0:850eacf3e945 1071 if (netif->hostname != NULL) {
RodColeman 0:850eacf3e945 1072 const char *p = (const char*)netif->hostname;
RodColeman 0:850eacf3e945 1073 u8_t namelen = (u8_t)strlen(p);
RodColeman 0:850eacf3e945 1074 if (namelen > 0) {
RodColeman 0:850eacf3e945 1075 LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
RodColeman 0:850eacf3e945 1076 dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
RodColeman 0:850eacf3e945 1077 while (*p) {
RodColeman 0:850eacf3e945 1078 dhcp_option_byte(dhcp, *p++);
RodColeman 0:850eacf3e945 1079 }
RodColeman 0:850eacf3e945 1080 }
RodColeman 0:850eacf3e945 1081 }
RodColeman 0:850eacf3e945 1082 #endif /* LWIP_NETIF_HOSTNAME */
RodColeman 0:850eacf3e945 1083
RodColeman 0:850eacf3e945 1084 #if 0
RodColeman 0:850eacf3e945 1085 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
RodColeman 0:850eacf3e945 1086 dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
RodColeman 0:850eacf3e945 1087
RodColeman 0:850eacf3e945 1088 dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
RodColeman 0:850eacf3e945 1089 dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
RodColeman 0:850eacf3e945 1090 #endif
RodColeman 0:850eacf3e945 1091
RodColeman 0:850eacf3e945 1092 dhcp_option_trailer(dhcp);
RodColeman 0:850eacf3e945 1093
RodColeman 0:850eacf3e945 1094 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
RodColeman 0:850eacf3e945 1095
RodColeman 0:850eacf3e945 1096 /* broadcast to server */
RodColeman 0:850eacf3e945 1097 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
RodColeman 0:850eacf3e945 1098 dhcp_delete_msg(dhcp);
RodColeman 0:850eacf3e945 1099 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind: REBINDING\n"));
RodColeman 0:850eacf3e945 1100 } else {
RodColeman 0:850eacf3e945 1101 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_rebind: could not allocate DHCP request\n"));
RodColeman 0:850eacf3e945 1102 }
RodColeman 0:850eacf3e945 1103 dhcp->tries++;
RodColeman 0:850eacf3e945 1104 msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
RodColeman 0:850eacf3e945 1105 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
RodColeman 0:850eacf3e945 1106 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind(): set request timeout %"U16_F" msecs\n", msecs));
RodColeman 0:850eacf3e945 1107 return result;
RodColeman 0:850eacf3e945 1108 }
RodColeman 0:850eacf3e945 1109
RodColeman 0:850eacf3e945 1110 /**
RodColeman 0:850eacf3e945 1111 * Enter REBOOTING state to verify an existing lease
RodColeman 0:850eacf3e945 1112 *
RodColeman 0:850eacf3e945 1113 * @param netif network interface which must reboot
RodColeman 0:850eacf3e945 1114 */
RodColeman 0:850eacf3e945 1115 static err_t
RodColeman 0:850eacf3e945 1116 dhcp_reboot(struct netif *netif)
RodColeman 0:850eacf3e945 1117 {
RodColeman 0:850eacf3e945 1118 struct dhcp *dhcp = netif->dhcp;
RodColeman 0:850eacf3e945 1119 err_t result;
RodColeman 0:850eacf3e945 1120 u16_t msecs;
RodColeman 0:850eacf3e945 1121 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot()\n"));
RodColeman 0:850eacf3e945 1122 dhcp_set_state(dhcp, DHCP_REBOOTING);
RodColeman 0:850eacf3e945 1123
RodColeman 0:850eacf3e945 1124 /* create and initialize the DHCP message header */
RodColeman 0:850eacf3e945 1125 result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
RodColeman 0:850eacf3e945 1126 if (result == ERR_OK) {
RodColeman 0:850eacf3e945 1127 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
RodColeman 0:850eacf3e945 1128 dhcp_option_short(dhcp, 576);
RodColeman 0:850eacf3e945 1129
RodColeman 0:850eacf3e945 1130 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
RodColeman 0:850eacf3e945 1131 dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
RodColeman 0:850eacf3e945 1132
RodColeman 0:850eacf3e945 1133 dhcp_option_trailer(dhcp);
RodColeman 0:850eacf3e945 1134
RodColeman 0:850eacf3e945 1135 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
RodColeman 0:850eacf3e945 1136
RodColeman 0:850eacf3e945 1137 /* broadcast to server */
RodColeman 0:850eacf3e945 1138 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
RodColeman 0:850eacf3e945 1139 dhcp_delete_msg(dhcp);
RodColeman 0:850eacf3e945 1140 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot: REBOOTING\n"));
RodColeman 0:850eacf3e945 1141 } else {
RodColeman 0:850eacf3e945 1142 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_reboot: could not allocate DHCP request\n"));
RodColeman 0:850eacf3e945 1143 }
RodColeman 0:850eacf3e945 1144 dhcp->tries++;
RodColeman 0:850eacf3e945 1145 msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
RodColeman 0:850eacf3e945 1146 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
RodColeman 0:850eacf3e945 1147 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot(): set request timeout %"U16_F" msecs\n", msecs));
RodColeman 0:850eacf3e945 1148 return result;
RodColeman 0:850eacf3e945 1149 }
RodColeman 0:850eacf3e945 1150
RodColeman 0:850eacf3e945 1151
RodColeman 0:850eacf3e945 1152 /**
RodColeman 0:850eacf3e945 1153 * Release a DHCP lease.
RodColeman 0:850eacf3e945 1154 *
RodColeman 0:850eacf3e945 1155 * @param netif network interface which must release its lease
RodColeman 0:850eacf3e945 1156 */
RodColeman 0:850eacf3e945 1157 err_t
RodColeman 0:850eacf3e945 1158 dhcp_release(struct netif *netif)
RodColeman 0:850eacf3e945 1159 {
RodColeman 0:850eacf3e945 1160 struct dhcp *dhcp = netif->dhcp;
RodColeman 0:850eacf3e945 1161 err_t result;
RodColeman 0:850eacf3e945 1162 u16_t msecs;
RodColeman 0:850eacf3e945 1163 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_release()\n"));
RodColeman 0:850eacf3e945 1164
RodColeman 0:850eacf3e945 1165 /* idle DHCP client */
RodColeman 0:850eacf3e945 1166 dhcp_set_state(dhcp, DHCP_OFF);
RodColeman 0:850eacf3e945 1167 /* clean old DHCP offer */
RodColeman 0:850eacf3e945 1168 ip_addr_set_zero(&dhcp->server_ip_addr);
RodColeman 0:850eacf3e945 1169 ip_addr_set_zero(&dhcp->offered_ip_addr);
RodColeman 0:850eacf3e945 1170 ip_addr_set_zero(&dhcp->offered_sn_mask);
RodColeman 0:850eacf3e945 1171 ip_addr_set_zero(&dhcp->offered_gw_addr);
RodColeman 0:850eacf3e945 1172 #if LWIP_DHCP_BOOTP_FILE
RodColeman 0:850eacf3e945 1173 ip_addr_set_zero(&dhcp->offered_si_addr);
RodColeman 0:850eacf3e945 1174 #endif /* LWIP_DHCP_BOOTP_FILE */
RodColeman 0:850eacf3e945 1175 dhcp->offered_t0_lease = dhcp->offered_t1_renew = dhcp->offered_t2_rebind = 0;
RodColeman 0:850eacf3e945 1176
RodColeman 0:850eacf3e945 1177 /* create and initialize the DHCP message header */
RodColeman 0:850eacf3e945 1178 result = dhcp_create_msg(netif, dhcp, DHCP_RELEASE);
RodColeman 0:850eacf3e945 1179 if (result == ERR_OK) {
RodColeman 0:850eacf3e945 1180 dhcp_option_trailer(dhcp);
RodColeman 0:850eacf3e945 1181
RodColeman 0:850eacf3e945 1182 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
RodColeman 0:850eacf3e945 1183
RodColeman 0:850eacf3e945 1184 udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
RodColeman 0:850eacf3e945 1185 dhcp_delete_msg(dhcp);
RodColeman 0:850eacf3e945 1186 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_release: RELEASED, DHCP_OFF\n"));
RodColeman 0:850eacf3e945 1187 } else {
RodColeman 0:850eacf3e945 1188 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_release: could not allocate DHCP request\n"));
RodColeman 0:850eacf3e945 1189 }
RodColeman 0:850eacf3e945 1190 dhcp->tries++;
RodColeman 0:850eacf3e945 1191 msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
RodColeman 0:850eacf3e945 1192 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
RodColeman 0:850eacf3e945 1193 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_release(): set request timeout %"U16_F" msecs\n", msecs));
RodColeman 0:850eacf3e945 1194 /* bring the interface down */
RodColeman 0:850eacf3e945 1195 netif_set_down(netif);
RodColeman 0:850eacf3e945 1196 /* remove IP address from interface */
RodColeman 0:850eacf3e945 1197 netif_set_ipaddr(netif, IP_ADDR_ANY);
RodColeman 0:850eacf3e945 1198 netif_set_gw(netif, IP_ADDR_ANY);
RodColeman 0:850eacf3e945 1199 netif_set_netmask(netif, IP_ADDR_ANY);
RodColeman 0:850eacf3e945 1200
RodColeman 0:850eacf3e945 1201 return result;
RodColeman 0:850eacf3e945 1202 }
RodColeman 0:850eacf3e945 1203
RodColeman 0:850eacf3e945 1204 /**
RodColeman 0:850eacf3e945 1205 * Remove the DHCP client from the interface.
RodColeman 0:850eacf3e945 1206 *
RodColeman 0:850eacf3e945 1207 * @param netif The network interface to stop DHCP on
RodColeman 0:850eacf3e945 1208 */
RodColeman 0:850eacf3e945 1209 void
RodColeman 0:850eacf3e945 1210 dhcp_stop(struct netif *netif)
RodColeman 0:850eacf3e945 1211 {
RodColeman 0:850eacf3e945 1212 struct dhcp *dhcp;
RodColeman 0:850eacf3e945 1213 LWIP_ERROR("dhcp_stop: netif != NULL", (netif != NULL), return;);
RodColeman 0:850eacf3e945 1214 dhcp = netif->dhcp;
RodColeman 0:850eacf3e945 1215 /* Remove the flag that says this netif is handled by DHCP. */
RodColeman 0:850eacf3e945 1216 netif->flags &= ~NETIF_FLAG_DHCP;
RodColeman 0:850eacf3e945 1217
RodColeman 0:850eacf3e945 1218 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_stop()\n"));
RodColeman 0:850eacf3e945 1219 /* netif is DHCP configured? */
RodColeman 0:850eacf3e945 1220 if (dhcp != NULL) {
RodColeman 0:850eacf3e945 1221 #if LWIP_DHCP_AUTOIP_COOP
RodColeman 0:850eacf3e945 1222 if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
RodColeman 0:850eacf3e945 1223 autoip_stop(netif);
RodColeman 0:850eacf3e945 1224 dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
RodColeman 0:850eacf3e945 1225 }
RodColeman 0:850eacf3e945 1226 #endif /* LWIP_DHCP_AUTOIP_COOP */
RodColeman 0:850eacf3e945 1227
RodColeman 0:850eacf3e945 1228 if (dhcp->pcb != NULL) {
RodColeman 0:850eacf3e945 1229 udp_remove(dhcp->pcb);
RodColeman 0:850eacf3e945 1230 dhcp->pcb = NULL;
RodColeman 0:850eacf3e945 1231 }
RodColeman 0:850eacf3e945 1232 LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
RodColeman 0:850eacf3e945 1233 dhcp_set_state(dhcp, DHCP_OFF);
RodColeman 0:850eacf3e945 1234 }
RodColeman 0:850eacf3e945 1235 }
RodColeman 0:850eacf3e945 1236
RodColeman 0:850eacf3e945 1237 /*
RodColeman 0:850eacf3e945 1238 * Set the DHCP state of a DHCP client.
RodColeman 0:850eacf3e945 1239 *
RodColeman 0:850eacf3e945 1240 * If the state changed, reset the number of tries.
RodColeman 0:850eacf3e945 1241 */
RodColeman 0:850eacf3e945 1242 static void
RodColeman 0:850eacf3e945 1243 dhcp_set_state(struct dhcp *dhcp, u8_t new_state)
RodColeman 0:850eacf3e945 1244 {
RodColeman 0:850eacf3e945 1245 if (new_state != dhcp->state) {
RodColeman 0:850eacf3e945 1246 dhcp->state = new_state;
RodColeman 0:850eacf3e945 1247 dhcp->tries = 0;
RodColeman 0:850eacf3e945 1248 dhcp->request_timeout = 0;
RodColeman 0:850eacf3e945 1249 }
RodColeman 0:850eacf3e945 1250 }
RodColeman 0:850eacf3e945 1251
RodColeman 0:850eacf3e945 1252 /*
RodColeman 0:850eacf3e945 1253 * Concatenate an option type and length field to the outgoing
RodColeman 0:850eacf3e945 1254 * DHCP message.
RodColeman 0:850eacf3e945 1255 *
RodColeman 0:850eacf3e945 1256 */
RodColeman 0:850eacf3e945 1257 static void
RodColeman 0:850eacf3e945 1258 dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len)
RodColeman 0:850eacf3e945 1259 {
RodColeman 0:850eacf3e945 1260 LWIP_ASSERT("dhcp_option: dhcp->options_out_len + 2 + option_len <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U + option_len <= DHCP_OPTIONS_LEN);
RodColeman 0:850eacf3e945 1261 dhcp->msg_out->options[dhcp->options_out_len++] = option_type;
RodColeman 0:850eacf3e945 1262 dhcp->msg_out->options[dhcp->options_out_len++] = option_len;
RodColeman 0:850eacf3e945 1263 }
RodColeman 0:850eacf3e945 1264 /*
RodColeman 0:850eacf3e945 1265 * Concatenate a single byte to the outgoing DHCP message.
RodColeman 0:850eacf3e945 1266 *
RodColeman 0:850eacf3e945 1267 */
RodColeman 0:850eacf3e945 1268 static void
RodColeman 0:850eacf3e945 1269 dhcp_option_byte(struct dhcp *dhcp, u8_t value)
RodColeman 0:850eacf3e945 1270 {
RodColeman 0:850eacf3e945 1271 LWIP_ASSERT("dhcp_option_byte: dhcp->options_out_len < DHCP_OPTIONS_LEN", dhcp->options_out_len < DHCP_OPTIONS_LEN);
RodColeman 0:850eacf3e945 1272 dhcp->msg_out->options[dhcp->options_out_len++] = value;
RodColeman 0:850eacf3e945 1273 }
RodColeman 0:850eacf3e945 1274
RodColeman 0:850eacf3e945 1275 static void
RodColeman 0:850eacf3e945 1276 dhcp_option_short(struct dhcp *dhcp, u16_t value)
RodColeman 0:850eacf3e945 1277 {
RodColeman 0:850eacf3e945 1278 LWIP_ASSERT("dhcp_option_short: dhcp->options_out_len + 2 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U <= DHCP_OPTIONS_LEN);
RodColeman 0:850eacf3e945 1279 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff00U) >> 8);
RodColeman 0:850eacf3e945 1280 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t) (value & 0x00ffU);
RodColeman 0:850eacf3e945 1281 }
RodColeman 0:850eacf3e945 1282
RodColeman 0:850eacf3e945 1283 static void
RodColeman 0:850eacf3e945 1284 dhcp_option_long(struct dhcp *dhcp, u32_t value)
RodColeman 0:850eacf3e945 1285 {
RodColeman 0:850eacf3e945 1286 LWIP_ASSERT("dhcp_option_long: dhcp->options_out_len + 4 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 4U <= DHCP_OPTIONS_LEN);
RodColeman 0:850eacf3e945 1287 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff000000UL) >> 24);
RodColeman 0:850eacf3e945 1288 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x00ff0000UL) >> 16);
RodColeman 0:850eacf3e945 1289 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x0000ff00UL) >> 8);
RodColeman 0:850eacf3e945 1290 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x000000ffUL));
RodColeman 0:850eacf3e945 1291 }
RodColeman 0:850eacf3e945 1292
RodColeman 0:850eacf3e945 1293 /**
RodColeman 0:850eacf3e945 1294 * Extract the DHCP message and the DHCP options.
RodColeman 0:850eacf3e945 1295 *
RodColeman 0:850eacf3e945 1296 * Extract the DHCP message and the DHCP options, each into a contiguous
RodColeman 0:850eacf3e945 1297 * piece of memory. As a DHCP message is variable sized by its options,
RodColeman 0:850eacf3e945 1298 * and also allows overriding some fields for options, the easy approach
RodColeman 0:850eacf3e945 1299 * is to first unfold the options into a conitguous piece of memory, and
RodColeman 0:850eacf3e945 1300 * use that further on.
RodColeman 0:850eacf3e945 1301 *
RodColeman 0:850eacf3e945 1302 */
RodColeman 0:850eacf3e945 1303 static err_t
RodColeman 0:850eacf3e945 1304 dhcp_parse_reply(struct dhcp *dhcp, struct pbuf *p)
RodColeman 0:850eacf3e945 1305 {
RodColeman 0:850eacf3e945 1306 u8_t *options;
RodColeman 0:850eacf3e945 1307 u16_t offset;
RodColeman 0:850eacf3e945 1308 u16_t offset_max;
RodColeman 0:850eacf3e945 1309 u16_t options_idx;
RodColeman 0:850eacf3e945 1310 u16_t options_idx_max;
RodColeman 0:850eacf3e945 1311 struct pbuf *q;
RodColeman 0:850eacf3e945 1312 int parse_file_as_options = 0;
RodColeman 0:850eacf3e945 1313 int parse_sname_as_options = 0;
RodColeman 0:850eacf3e945 1314
RodColeman 0:850eacf3e945 1315 /* clear received options */
RodColeman 0:850eacf3e945 1316 dhcp_clear_all_options(dhcp);
RodColeman 0:850eacf3e945 1317 /* check that beginning of dhcp_msg (up to and including chaddr) is in first pbuf */
RodColeman 0:850eacf3e945 1318 if (p->len < DHCP_SNAME_OFS) {
RodColeman 0:850eacf3e945 1319 return ERR_BUF;
RodColeman 0:850eacf3e945 1320 }
RodColeman 0:850eacf3e945 1321 dhcp->msg_in = (struct dhcp_msg *)p->payload;
RodColeman 0:850eacf3e945 1322 #if LWIP_DHCP_BOOTP_FILE
RodColeman 0:850eacf3e945 1323 /* clear boot file name */
RodColeman 0:850eacf3e945 1324 dhcp->boot_file_name[0] = 0;
RodColeman 0:850eacf3e945 1325 #endif /* LWIP_DHCP_BOOTP_FILE */
RodColeman 0:850eacf3e945 1326
RodColeman 0:850eacf3e945 1327 /* parse options */
RodColeman 0:850eacf3e945 1328
RodColeman 0:850eacf3e945 1329 /* start with options field */
RodColeman 0:850eacf3e945 1330 options_idx = DHCP_OPTIONS_OFS;
RodColeman 0:850eacf3e945 1331 /* parse options to the end of the received packet */
RodColeman 0:850eacf3e945 1332 options_idx_max = p->tot_len;
RodColeman 0:850eacf3e945 1333 again:
RodColeman 0:850eacf3e945 1334 q = p;
RodColeman 0:850eacf3e945 1335 while((q != NULL) && (options_idx >= q->len)) {
RodColeman 0:850eacf3e945 1336 options_idx -= q->len;
RodColeman 0:850eacf3e945 1337 options_idx_max -= q->len;
RodColeman 0:850eacf3e945 1338 q = q->next;
RodColeman 0:850eacf3e945 1339 }
RodColeman 0:850eacf3e945 1340 if (q == NULL) {
RodColeman 0:850eacf3e945 1341 return ERR_BUF;
RodColeman 0:850eacf3e945 1342 }
RodColeman 0:850eacf3e945 1343 offset = options_idx;
RodColeman 0:850eacf3e945 1344 offset_max = options_idx_max;
RodColeman 0:850eacf3e945 1345 options = (u8_t*)q->payload;
RodColeman 0:850eacf3e945 1346 /* at least 1 byte to read and no end marker, then at least 3 bytes to read? */
RodColeman 0:850eacf3e945 1347 while((q != NULL) && (options[offset] != DHCP_OPTION_END) && (offset < offset_max)) {
RodColeman 0:850eacf3e945 1348 u8_t op = options[offset];
RodColeman 0:850eacf3e945 1349 u8_t len;
RodColeman 0:850eacf3e945 1350 u8_t decode_len = 0;
RodColeman 0:850eacf3e945 1351 int decode_idx = -1;
RodColeman 0:850eacf3e945 1352 u16_t val_offset = offset + 2;
RodColeman 0:850eacf3e945 1353 /* len byte might be in the next pbuf */
RodColeman 0:850eacf3e945 1354 if (offset + 1 < q->len) {
RodColeman 0:850eacf3e945 1355 len = options[offset + 1];
RodColeman 0:850eacf3e945 1356 } else {
RodColeman 0:850eacf3e945 1357 len = (q->next != NULL ? ((u8_t*)q->next->payload)[0] : 0);
RodColeman 0:850eacf3e945 1358 }
RodColeman 0:850eacf3e945 1359 /* LWIP_DEBUGF(DHCP_DEBUG, ("msg_offset=%"U16_F", q->len=%"U16_F, msg_offset, q->len)); */
RodColeman 0:850eacf3e945 1360 decode_len = len;
RodColeman 0:850eacf3e945 1361 switch(op) {
RodColeman 0:850eacf3e945 1362 /* case(DHCP_OPTION_END): handled above */
RodColeman 0:850eacf3e945 1363 case(DHCP_OPTION_PAD):
RodColeman 0:850eacf3e945 1364 /* special option: no len encoded */
RodColeman 0:850eacf3e945 1365 decode_len = len = 0;
RodColeman 0:850eacf3e945 1366 /* will be increased below */
RodColeman 0:850eacf3e945 1367 offset--;
RodColeman 0:850eacf3e945 1368 break;
RodColeman 0:850eacf3e945 1369 case(DHCP_OPTION_SUBNET_MASK):
RodColeman 0:850eacf3e945 1370 LWIP_ASSERT("len == 4", len == 4);
RodColeman 0:850eacf3e945 1371 decode_idx = DHCP_OPTION_IDX_SUBNET_MASK;
RodColeman 0:850eacf3e945 1372 break;
RodColeman 0:850eacf3e945 1373 case(DHCP_OPTION_ROUTER):
RodColeman 0:850eacf3e945 1374 decode_len = 4; /* only copy the first given router */
RodColeman 0:850eacf3e945 1375 LWIP_ASSERT("len >= decode_len", len >= decode_len);
RodColeman 0:850eacf3e945 1376 decode_idx = DHCP_OPTION_IDX_ROUTER;
RodColeman 0:850eacf3e945 1377 break;
RodColeman 0:850eacf3e945 1378 case(DHCP_OPTION_DNS_SERVER):
RodColeman 0:850eacf3e945 1379 /* special case: there might be more than one server */
RodColeman 0:850eacf3e945 1380 LWIP_ASSERT("len % 4 == 0", len % 4 == 0);
RodColeman 0:850eacf3e945 1381 /* limit number of DNS servers */
RodColeman 0:850eacf3e945 1382 decode_len = LWIP_MIN(len, 4 * DNS_MAX_SERVERS);
RodColeman 0:850eacf3e945 1383 LWIP_ASSERT("len >= decode_len", len >= decode_len);
RodColeman 0:850eacf3e945 1384 decode_idx = DHCP_OPTION_IDX_DNS_SERVER;
RodColeman 0:850eacf3e945 1385 break;
RodColeman 0:850eacf3e945 1386 case(DHCP_OPTION_LEASE_TIME):
RodColeman 0:850eacf3e945 1387 LWIP_ASSERT("len == 4", len == 4);
RodColeman 0:850eacf3e945 1388 decode_idx = DHCP_OPTION_IDX_LEASE_TIME;
RodColeman 0:850eacf3e945 1389 break;
RodColeman 0:850eacf3e945 1390 case(DHCP_OPTION_OVERLOAD):
RodColeman 0:850eacf3e945 1391 LWIP_ASSERT("len == 1", len == 1);
RodColeman 0:850eacf3e945 1392 decode_idx = DHCP_OPTION_IDX_OVERLOAD;
RodColeman 0:850eacf3e945 1393 break;
RodColeman 0:850eacf3e945 1394 case(DHCP_OPTION_MESSAGE_TYPE):
RodColeman 0:850eacf3e945 1395 LWIP_ASSERT("len == 1", len == 1);
RodColeman 0:850eacf3e945 1396 decode_idx = DHCP_OPTION_IDX_MSG_TYPE;
RodColeman 0:850eacf3e945 1397 break;
RodColeman 0:850eacf3e945 1398 case(DHCP_OPTION_SERVER_ID):
RodColeman 0:850eacf3e945 1399 LWIP_ASSERT("len == 4", len == 4);
RodColeman 0:850eacf3e945 1400 decode_idx = DHCP_OPTION_IDX_SERVER_ID;
RodColeman 0:850eacf3e945 1401 break;
RodColeman 0:850eacf3e945 1402 case(DHCP_OPTION_T1):
RodColeman 0:850eacf3e945 1403 LWIP_ASSERT("len == 4", len == 4);
RodColeman 0:850eacf3e945 1404 decode_idx = DHCP_OPTION_IDX_T1;
RodColeman 0:850eacf3e945 1405 break;
RodColeman 0:850eacf3e945 1406 case(DHCP_OPTION_T2):
RodColeman 0:850eacf3e945 1407 LWIP_ASSERT("len == 4", len == 4);
RodColeman 0:850eacf3e945 1408 decode_idx = DHCP_OPTION_IDX_T2;
RodColeman 0:850eacf3e945 1409 break;
RodColeman 0:850eacf3e945 1410 default:
RodColeman 0:850eacf3e945 1411 decode_len = 0;
RodColeman 0:850eacf3e945 1412 LWIP_DEBUGF(DHCP_DEBUG, ("skipping option %"U16_F" in options\n", op));
RodColeman 0:850eacf3e945 1413 break;
RodColeman 0:850eacf3e945 1414 }
RodColeman 0:850eacf3e945 1415 offset += len + 2;
RodColeman 0:850eacf3e945 1416 if (decode_len > 0) {
RodColeman 0:850eacf3e945 1417 u32_t value = 0;
RodColeman 0:850eacf3e945 1418 u16_t copy_len;
RodColeman 0:850eacf3e945 1419 decode_next:
RodColeman 0:850eacf3e945 1420 LWIP_ASSERT("check decode_idx", decode_idx >= 0 && decode_idx < DHCP_OPTION_IDX_MAX);
RodColeman 0:850eacf3e945 1421 LWIP_ASSERT("option already decoded", !dhcp_option_given(dhcp, decode_idx));
RodColeman 0:850eacf3e945 1422 copy_len = LWIP_MIN(decode_len, 4);
RodColeman 0:850eacf3e945 1423 pbuf_copy_partial(q, &value, copy_len, val_offset);
RodColeman 0:850eacf3e945 1424 if (decode_len > 4) {
RodColeman 0:850eacf3e945 1425 /* decode more than one u32_t */
RodColeman 0:850eacf3e945 1426 LWIP_ASSERT("decode_len % 4 == 0", decode_len % 4 == 0);
RodColeman 0:850eacf3e945 1427 dhcp_got_option(dhcp, decode_idx);
RodColeman 0:850eacf3e945 1428 dhcp_set_option_value(dhcp, decode_idx, htonl(value));
RodColeman 0:850eacf3e945 1429 decode_len -= 4;
RodColeman 0:850eacf3e945 1430 val_offset += 4;
RodColeman 0:850eacf3e945 1431 decode_idx++;
RodColeman 0:850eacf3e945 1432 goto decode_next;
RodColeman 0:850eacf3e945 1433 } else if (decode_len == 4) {
RodColeman 0:850eacf3e945 1434 value = ntohl(value);
RodColeman 0:850eacf3e945 1435 } else {
RodColeman 0:850eacf3e945 1436 LWIP_ASSERT("invalid decode_len", decode_len == 1);
RodColeman 0:850eacf3e945 1437 value = ((u8_t*)&value)[0];
RodColeman 0:850eacf3e945 1438 }
RodColeman 0:850eacf3e945 1439 dhcp_got_option(dhcp, decode_idx);
RodColeman 0:850eacf3e945 1440 dhcp_set_option_value(dhcp, decode_idx, value);
RodColeman 0:850eacf3e945 1441 }
RodColeman 0:850eacf3e945 1442 if (offset >= q->len) {
RodColeman 0:850eacf3e945 1443 offset -= q->len;
RodColeman 0:850eacf3e945 1444 offset_max -= q->len;
RodColeman 0:850eacf3e945 1445 q = q->next;
RodColeman 0:850eacf3e945 1446 options = (u8_t*)q->payload;
RodColeman 0:850eacf3e945 1447 }
RodColeman 0:850eacf3e945 1448 }
RodColeman 0:850eacf3e945 1449 /* is this an overloaded message? */
RodColeman 0:850eacf3e945 1450 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_OVERLOAD)) {
RodColeman 0:850eacf3e945 1451 u32_t overload = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_OVERLOAD);
RodColeman 0:850eacf3e945 1452 dhcp_clear_option(dhcp, DHCP_OPTION_IDX_OVERLOAD);
RodColeman 0:850eacf3e945 1453 if (overload == DHCP_OVERLOAD_FILE) {
RodColeman 0:850eacf3e945 1454 parse_file_as_options = 1;
RodColeman 0:850eacf3e945 1455 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded file field\n"));
RodColeman 0:850eacf3e945 1456 } else if (overload == DHCP_OVERLOAD_SNAME) {
RodColeman 0:850eacf3e945 1457 parse_sname_as_options = 1;
RodColeman 0:850eacf3e945 1458 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded sname field\n"));
RodColeman 0:850eacf3e945 1459 } else if (overload == DHCP_OVERLOAD_SNAME_FILE) {
RodColeman 0:850eacf3e945 1460 parse_sname_as_options = 1;
RodColeman 0:850eacf3e945 1461 parse_file_as_options = 1;
RodColeman 0:850eacf3e945 1462 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded sname and file field\n"));
RodColeman 0:850eacf3e945 1463 } else {
RodColeman 0:850eacf3e945 1464 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("invalid overload option: %d\n", (int)overload));
RodColeman 0:850eacf3e945 1465 }
RodColeman 0:850eacf3e945 1466 #if LWIP_DHCP_BOOTP_FILE
RodColeman 0:850eacf3e945 1467 if (!parse_file_as_options) {
RodColeman 0:850eacf3e945 1468 /* only do this for ACK messages */
RodColeman 0:850eacf3e945 1469 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE) &&
RodColeman 0:850eacf3e945 1470 (dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE) == DHCP_ACK))
RodColeman 0:850eacf3e945 1471 /* copy bootp file name, don't care for sname (server hostname) */
RodColeman 0:850eacf3e945 1472 pbuf_copy_partial(p, dhcp->boot_file_name, DHCP_FILE_LEN-1, DHCP_FILE_OFS);
RodColeman 0:850eacf3e945 1473 /* make sure the string is really NULL-terminated */
RodColeman 0:850eacf3e945 1474 dhcp->boot_file_name[DHCP_FILE_LEN-1] = 0;
RodColeman 0:850eacf3e945 1475 }
RodColeman 0:850eacf3e945 1476 #endif /* LWIP_DHCP_BOOTP_FILE */
RodColeman 0:850eacf3e945 1477 }
RodColeman 0:850eacf3e945 1478 if (parse_file_as_options) {
RodColeman 0:850eacf3e945 1479 /* if both are overloaded, parse file first and then sname (RFC 2131 ch. 4.1) */
RodColeman 0:850eacf3e945 1480 parse_file_as_options = 0;
RodColeman 0:850eacf3e945 1481 options_idx = DHCP_FILE_OFS;
RodColeman 0:850eacf3e945 1482 options_idx_max = DHCP_FILE_OFS + DHCP_FILE_LEN;
RodColeman 0:850eacf3e945 1483 goto again;
RodColeman 0:850eacf3e945 1484 } else if (parse_sname_as_options) {
RodColeman 0:850eacf3e945 1485 parse_sname_as_options = 0;
RodColeman 0:850eacf3e945 1486 options_idx = DHCP_SNAME_OFS;
RodColeman 0:850eacf3e945 1487 options_idx_max = DHCP_SNAME_OFS + DHCP_SNAME_LEN;
RodColeman 0:850eacf3e945 1488 goto again;
RodColeman 0:850eacf3e945 1489 }
RodColeman 0:850eacf3e945 1490 return ERR_OK;
RodColeman 0:850eacf3e945 1491 }
RodColeman 0:850eacf3e945 1492
RodColeman 0:850eacf3e945 1493 /**
RodColeman 0:850eacf3e945 1494 * If an incoming DHCP message is in response to us, then trigger the state machine
RodColeman 0:850eacf3e945 1495 */
RodColeman 0:850eacf3e945 1496 static void
RodColeman 0:850eacf3e945 1497 dhcp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port)
RodColeman 0:850eacf3e945 1498 {
RodColeman 0:850eacf3e945 1499 struct netif *netif = (struct netif *)arg;
RodColeman 0:850eacf3e945 1500 struct dhcp *dhcp = netif->dhcp;
RodColeman 0:850eacf3e945 1501 struct dhcp_msg *reply_msg = (struct dhcp_msg *)p->payload;
RodColeman 0:850eacf3e945 1502 u8_t msg_type;
RodColeman 0:850eacf3e945 1503 u8_t i;
RodColeman 0:850eacf3e945 1504 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_recv(pbuf = %p) from DHCP server %"U16_F".%"U16_F".%"U16_F".%"U16_F" port %"U16_F"\n", (void*)p,
RodColeman 0:850eacf3e945 1505 ip4_addr1_16(addr), ip4_addr2_16(addr), ip4_addr3_16(addr), ip4_addr4_16(addr), port));
RodColeman 0:850eacf3e945 1506 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("pbuf->len = %"U16_F"\n", p->len));
RodColeman 0:850eacf3e945 1507 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("pbuf->tot_len = %"U16_F"\n", p->tot_len));
RodColeman 0:850eacf3e945 1508 /* prevent warnings about unused arguments */
RodColeman 0:850eacf3e945 1509 LWIP_UNUSED_ARG(pcb);
RodColeman 0:850eacf3e945 1510 LWIP_UNUSED_ARG(addr);
RodColeman 0:850eacf3e945 1511 LWIP_UNUSED_ARG(port);
RodColeman 0:850eacf3e945 1512
RodColeman 0:850eacf3e945 1513 LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
RodColeman 0:850eacf3e945 1514
RodColeman 0:850eacf3e945 1515 if (p->len < DHCP_MIN_REPLY_LEN) {
RodColeman 0:850eacf3e945 1516 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("DHCP reply message or pbuf too short\n"));
RodColeman 0:850eacf3e945 1517 goto free_pbuf_and_return;
RodColeman 0:850eacf3e945 1518 }
RodColeman 0:850eacf3e945 1519
RodColeman 0:850eacf3e945 1520 if (reply_msg->op != DHCP_BOOTREPLY) {
RodColeman 0:850eacf3e945 1521 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("not a DHCP reply message, but type %"U16_F"\n", (u16_t)reply_msg->op));
RodColeman 0:850eacf3e945 1522 goto free_pbuf_and_return;
RodColeman 0:850eacf3e945 1523 }
RodColeman 0:850eacf3e945 1524 /* iterate through hardware address and match against DHCP message */
RodColeman 0:850eacf3e945 1525 for (i = 0; i < netif->hwaddr_len; i++) {
RodColeman 0:850eacf3e945 1526 if (netif->hwaddr[i] != reply_msg->chaddr[i]) {
RodColeman 0:850eacf3e945 1527 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
RodColeman 0:850eacf3e945 1528 ("netif->hwaddr[%"U16_F"]==%02"X16_F" != reply_msg->chaddr[%"U16_F"]==%02"X16_F"\n",
RodColeman 0:850eacf3e945 1529 (u16_t)i, (u16_t)netif->hwaddr[i], (u16_t)i, (u16_t)reply_msg->chaddr[i]));
RodColeman 0:850eacf3e945 1530 goto free_pbuf_and_return;
RodColeman 0:850eacf3e945 1531 }
RodColeman 0:850eacf3e945 1532 }
RodColeman 0:850eacf3e945 1533 /* match transaction ID against what we expected */
RodColeman 0:850eacf3e945 1534 if (ntohl(reply_msg->xid) != dhcp->xid) {
RodColeman 0:850eacf3e945 1535 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
RodColeman 0:850eacf3e945 1536 ("transaction id mismatch reply_msg->xid(%"X32_F")!=dhcp->xid(%"X32_F")\n",ntohl(reply_msg->xid),dhcp->xid));
RodColeman 0:850eacf3e945 1537 goto free_pbuf_and_return;
RodColeman 0:850eacf3e945 1538 }
RodColeman 0:850eacf3e945 1539 /* option fields could be unfold? */
RodColeman 0:850eacf3e945 1540 if (dhcp_parse_reply(dhcp, p) != ERR_OK) {
RodColeman 0:850eacf3e945 1541 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
RodColeman 0:850eacf3e945 1542 ("problem unfolding DHCP message - too short on memory?\n"));
RodColeman 0:850eacf3e945 1543 goto free_pbuf_and_return;
RodColeman 0:850eacf3e945 1544 }
RodColeman 0:850eacf3e945 1545
RodColeman 0:850eacf3e945 1546 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("searching DHCP_OPTION_MESSAGE_TYPE\n"));
RodColeman 0:850eacf3e945 1547 /* obtain pointer to DHCP message type */
RodColeman 0:850eacf3e945 1548 if (!dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE)) {
RodColeman 0:850eacf3e945 1549 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("DHCP_OPTION_MESSAGE_TYPE option not found\n"));
RodColeman 0:850eacf3e945 1550 goto free_pbuf_and_return;
RodColeman 0:850eacf3e945 1551 }
RodColeman 0:850eacf3e945 1552
RodColeman 0:850eacf3e945 1553 /* read DHCP message type */
RodColeman 0:850eacf3e945 1554 msg_type = (u8_t)dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE);
RodColeman 0:850eacf3e945 1555 /* message type is DHCP ACK? */
RodColeman 0:850eacf3e945 1556 if (msg_type == DHCP_ACK) {
RodColeman 0:850eacf3e945 1557 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_ACK received\n"));
RodColeman 0:850eacf3e945 1558 /* in requesting state? */
RodColeman 0:850eacf3e945 1559 if (dhcp->state == DHCP_REQUESTING) {
RodColeman 0:850eacf3e945 1560 dhcp_handle_ack(netif);
RodColeman 0:850eacf3e945 1561 #if DHCP_DOES_ARP_CHECK
RodColeman 0:850eacf3e945 1562 /* check if the acknowledged lease address is already in use */
RodColeman 0:850eacf3e945 1563 dhcp_check(netif);
RodColeman 0:850eacf3e945 1564 #else
RodColeman 0:850eacf3e945 1565 /* bind interface to the acknowledged lease address */
RodColeman 0:850eacf3e945 1566 dhcp_bind(netif);
RodColeman 0:850eacf3e945 1567 #endif
RodColeman 0:850eacf3e945 1568 }
RodColeman 0:850eacf3e945 1569 /* already bound to the given lease address? */
RodColeman 0:850eacf3e945 1570 else if ((dhcp->state == DHCP_REBOOTING) || (dhcp->state == DHCP_REBINDING) || (dhcp->state == DHCP_RENEWING)) {
RodColeman 0:850eacf3e945 1571 dhcp_bind(netif);
RodColeman 0:850eacf3e945 1572 }
RodColeman 0:850eacf3e945 1573 }
RodColeman 0:850eacf3e945 1574 /* received a DHCP_NAK in appropriate state? */
RodColeman 0:850eacf3e945 1575 else if ((msg_type == DHCP_NAK) &&
RodColeman 0:850eacf3e945 1576 ((dhcp->state == DHCP_REBOOTING) || (dhcp->state == DHCP_REQUESTING) ||
RodColeman 0:850eacf3e945 1577 (dhcp->state == DHCP_REBINDING) || (dhcp->state == DHCP_RENEWING ))) {
RodColeman 0:850eacf3e945 1578 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_NAK received\n"));
RodColeman 0:850eacf3e945 1579 dhcp_handle_nak(netif);
RodColeman 0:850eacf3e945 1580 }
RodColeman 0:850eacf3e945 1581 /* received a DHCP_OFFER in DHCP_SELECTING state? */
RodColeman 0:850eacf3e945 1582 else if ((msg_type == DHCP_OFFER) && (dhcp->state == DHCP_SELECTING)) {
RodColeman 0:850eacf3e945 1583 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_OFFER received in DHCP_SELECTING state\n"));
RodColeman 0:850eacf3e945 1584 dhcp->request_timeout = 0;
RodColeman 0:850eacf3e945 1585 /* remember offered lease */
RodColeman 0:850eacf3e945 1586 dhcp_handle_offer(netif);
RodColeman 0:850eacf3e945 1587 }
RodColeman 0:850eacf3e945 1588 free_pbuf_and_return:
RodColeman 0:850eacf3e945 1589 dhcp->msg_in = NULL;
RodColeman 0:850eacf3e945 1590 pbuf_free(p);
RodColeman 0:850eacf3e945 1591 }
RodColeman 0:850eacf3e945 1592
RodColeman 0:850eacf3e945 1593 /**
RodColeman 0:850eacf3e945 1594 * Create a DHCP request, fill in common headers
RodColeman 0:850eacf3e945 1595 *
RodColeman 0:850eacf3e945 1596 * @param netif the netif under DHCP control
RodColeman 0:850eacf3e945 1597 * @param dhcp dhcp control struct
RodColeman 0:850eacf3e945 1598 * @param message_type message type of the request
RodColeman 0:850eacf3e945 1599 */
RodColeman 0:850eacf3e945 1600 static err_t
RodColeman 0:850eacf3e945 1601 dhcp_create_msg(struct netif *netif, struct dhcp *dhcp, u8_t message_type)
RodColeman 0:850eacf3e945 1602 {
RodColeman 0:850eacf3e945 1603 u16_t i;
RodColeman 0:850eacf3e945 1604 #ifndef DHCP_GLOBAL_XID
RodColeman 0:850eacf3e945 1605 /** default global transaction identifier starting value (easy to match
RodColeman 0:850eacf3e945 1606 * with a packet analyser). We simply increment for each new request.
RodColeman 0:850eacf3e945 1607 * Predefine DHCP_GLOBAL_XID to a better value or a function call to generate one
RodColeman 0:850eacf3e945 1608 * at runtime, any supporting function prototypes can be defined in DHCP_GLOBAL_XID_HEADER */
RodColeman 0:850eacf3e945 1609 static u32_t xid = 0xABCD0000;
RodColeman 0:850eacf3e945 1610 #else
RodColeman 0:850eacf3e945 1611 static u32_t xid;
RodColeman 0:850eacf3e945 1612 static u8_t xid_initialised = 0;
RodColeman 0:850eacf3e945 1613 if (!xid_initialised) {
RodColeman 0:850eacf3e945 1614 xid = DHCP_GLOBAL_XID;
RodColeman 0:850eacf3e945 1615 xid_initialised = !xid_initialised;
RodColeman 0:850eacf3e945 1616 }
RodColeman 0:850eacf3e945 1617 #endif
RodColeman 0:850eacf3e945 1618 LWIP_ERROR("dhcp_create_msg: netif != NULL", (netif != NULL), return ERR_ARG;);
RodColeman 0:850eacf3e945 1619 LWIP_ERROR("dhcp_create_msg: dhcp != NULL", (dhcp != NULL), return ERR_VAL;);
RodColeman 0:850eacf3e945 1620 LWIP_ASSERT("dhcp_create_msg: dhcp->p_out == NULL", dhcp->p_out == NULL);
RodColeman 0:850eacf3e945 1621 LWIP_ASSERT("dhcp_create_msg: dhcp->msg_out == NULL", dhcp->msg_out == NULL);
RodColeman 0:850eacf3e945 1622 dhcp->p_out = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct dhcp_msg), PBUF_RAM);
RodColeman 0:850eacf3e945 1623 if (dhcp->p_out == NULL) {
RodColeman 0:850eacf3e945 1624 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
RodColeman 0:850eacf3e945 1625 ("dhcp_create_msg(): could not allocate pbuf\n"));
RodColeman 0:850eacf3e945 1626 return ERR_MEM;
RodColeman 0:850eacf3e945 1627 }
RodColeman 0:850eacf3e945 1628 LWIP_ASSERT("dhcp_create_msg: check that first pbuf can hold struct dhcp_msg",
RodColeman 0:850eacf3e945 1629 (dhcp->p_out->len >= sizeof(struct dhcp_msg)));
RodColeman 0:850eacf3e945 1630
RodColeman 0:850eacf3e945 1631 /* reuse transaction identifier in retransmissions */
RodColeman 0:850eacf3e945 1632 if (dhcp->tries == 0) {
RodColeman 0:850eacf3e945 1633 xid++;
RodColeman 0:850eacf3e945 1634 }
RodColeman 0:850eacf3e945 1635 dhcp->xid = xid;
RodColeman 0:850eacf3e945 1636 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE,
RodColeman 0:850eacf3e945 1637 ("transaction id xid(%"X32_F")\n", xid));
RodColeman 0:850eacf3e945 1638
RodColeman 0:850eacf3e945 1639 dhcp->msg_out = (struct dhcp_msg *)dhcp->p_out->payload;
RodColeman 0:850eacf3e945 1640
RodColeman 0:850eacf3e945 1641 dhcp->msg_out->op = DHCP_BOOTREQUEST;
RodColeman 0:850eacf3e945 1642 /* TODO: make link layer independent */
RodColeman 0:850eacf3e945 1643 dhcp->msg_out->htype = DHCP_HTYPE_ETH;
RodColeman 0:850eacf3e945 1644 dhcp->msg_out->hlen = netif->hwaddr_len;
RodColeman 0:850eacf3e945 1645 dhcp->msg_out->hops = 0;
RodColeman 0:850eacf3e945 1646 dhcp->msg_out->xid = htonl(dhcp->xid);
RodColeman 0:850eacf3e945 1647 dhcp->msg_out->secs = 0;
RodColeman 0:850eacf3e945 1648 /* we don't need the broadcast flag since we can receive unicast traffic
RodColeman 0:850eacf3e945 1649 before being fully configured! */
RodColeman 0:850eacf3e945 1650 dhcp->msg_out->flags = 0;
RodColeman 0:850eacf3e945 1651 ip_addr_set_zero(&dhcp->msg_out->ciaddr);
RodColeman 0:850eacf3e945 1652 /* set ciaddr to netif->ip_addr based on message_type and state */
RodColeman 0:850eacf3e945 1653 if ((message_type == DHCP_INFORM) || (message_type == DHCP_DECLINE) ||
RodColeman 0:850eacf3e945 1654 ((message_type == DHCP_REQUEST) && /* DHCP_BOUND not used for sending! */
RodColeman 0:850eacf3e945 1655 ((dhcp->state==DHCP_RENEWING) || dhcp->state==DHCP_REBINDING))) {
RodColeman 0:850eacf3e945 1656 ip_addr_copy(dhcp->msg_out->ciaddr, netif->ip_addr);
RodColeman 0:850eacf3e945 1657 }
RodColeman 0:850eacf3e945 1658 ip_addr_set_zero(&dhcp->msg_out->yiaddr);
RodColeman 0:850eacf3e945 1659 ip_addr_set_zero(&dhcp->msg_out->siaddr);
RodColeman 0:850eacf3e945 1660 ip_addr_set_zero(&dhcp->msg_out->giaddr);
RodColeman 0:850eacf3e945 1661 for (i = 0; i < DHCP_CHADDR_LEN; i++) {
RodColeman 0:850eacf3e945 1662 /* copy netif hardware address, pad with zeroes */
RodColeman 0:850eacf3e945 1663 dhcp->msg_out->chaddr[i] = (i < netif->hwaddr_len) ? netif->hwaddr[i] : 0/* pad byte*/;
RodColeman 0:850eacf3e945 1664 }
RodColeman 0:850eacf3e945 1665 for (i = 0; i < DHCP_SNAME_LEN; i++) {
RodColeman 0:850eacf3e945 1666 dhcp->msg_out->sname[i] = 0;
RodColeman 0:850eacf3e945 1667 }
RodColeman 0:850eacf3e945 1668 for (i = 0; i < DHCP_FILE_LEN; i++) {
RodColeman 0:850eacf3e945 1669 dhcp->msg_out->file[i] = 0;
RodColeman 0:850eacf3e945 1670 }
RodColeman 0:850eacf3e945 1671 dhcp->msg_out->cookie = PP_HTONL(DHCP_MAGIC_COOKIE);
RodColeman 0:850eacf3e945 1672 dhcp->options_out_len = 0;
RodColeman 0:850eacf3e945 1673 /* fill options field with an incrementing array (for debugging purposes) */
RodColeman 0:850eacf3e945 1674 for (i = 0; i < DHCP_OPTIONS_LEN; i++) {
RodColeman 0:850eacf3e945 1675 dhcp->msg_out->options[i] = (u8_t)i; /* for debugging only, no matter if truncated */
RodColeman 0:850eacf3e945 1676 }
RodColeman 0:850eacf3e945 1677 /* Add option MESSAGE_TYPE */
RodColeman 0:850eacf3e945 1678 dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
RodColeman 0:850eacf3e945 1679 dhcp_option_byte(dhcp, message_type);
RodColeman 0:850eacf3e945 1680 return ERR_OK;
RodColeman 0:850eacf3e945 1681 }
RodColeman 0:850eacf3e945 1682
RodColeman 0:850eacf3e945 1683 /**
RodColeman 0:850eacf3e945 1684 * Free previously allocated memory used to send a DHCP request.
RodColeman 0:850eacf3e945 1685 *
RodColeman 0:850eacf3e945 1686 * @param dhcp the dhcp struct to free the request from
RodColeman 0:850eacf3e945 1687 */
RodColeman 0:850eacf3e945 1688 static void
RodColeman 0:850eacf3e945 1689 dhcp_delete_msg(struct dhcp *dhcp)
RodColeman 0:850eacf3e945 1690 {
RodColeman 0:850eacf3e945 1691 LWIP_ERROR("dhcp_delete_msg: dhcp != NULL", (dhcp != NULL), return;);
RodColeman 0:850eacf3e945 1692 LWIP_ASSERT("dhcp_delete_msg: dhcp->p_out != NULL", dhcp->p_out != NULL);
RodColeman 0:850eacf3e945 1693 LWIP_ASSERT("dhcp_delete_msg: dhcp->msg_out != NULL", dhcp->msg_out != NULL);
RodColeman 0:850eacf3e945 1694 if (dhcp->p_out != NULL) {
RodColeman 0:850eacf3e945 1695 pbuf_free(dhcp->p_out);
RodColeman 0:850eacf3e945 1696 }
RodColeman 0:850eacf3e945 1697 dhcp->p_out = NULL;
RodColeman 0:850eacf3e945 1698 dhcp->msg_out = NULL;
RodColeman 0:850eacf3e945 1699 }
RodColeman 0:850eacf3e945 1700
RodColeman 0:850eacf3e945 1701 /**
RodColeman 0:850eacf3e945 1702 * Add a DHCP message trailer
RodColeman 0:850eacf3e945 1703 *
RodColeman 0:850eacf3e945 1704 * Adds the END option to the DHCP message, and if
RodColeman 0:850eacf3e945 1705 * necessary, up to three padding bytes.
RodColeman 0:850eacf3e945 1706 *
RodColeman 0:850eacf3e945 1707 * @param dhcp DHCP state structure
RodColeman 0:850eacf3e945 1708 */
RodColeman 0:850eacf3e945 1709 static void
RodColeman 0:850eacf3e945 1710 dhcp_option_trailer(struct dhcp *dhcp)
RodColeman 0:850eacf3e945 1711 {
RodColeman 0:850eacf3e945 1712 LWIP_ERROR("dhcp_option_trailer: dhcp != NULL", (dhcp != NULL), return;);
RodColeman 0:850eacf3e945 1713 LWIP_ASSERT("dhcp_option_trailer: dhcp->msg_out != NULL\n", dhcp->msg_out != NULL);
RodColeman 0:850eacf3e945 1714 LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
RodColeman 0:850eacf3e945 1715 dhcp->msg_out->options[dhcp->options_out_len++] = DHCP_OPTION_END;
RodColeman 0:850eacf3e945 1716 /* packet is too small, or not 4 byte aligned? */
RodColeman 0:850eacf3e945 1717 while ((dhcp->options_out_len < DHCP_MIN_OPTIONS_LEN) || (dhcp->options_out_len & 3)) {
RodColeman 0:850eacf3e945 1718 /* LWIP_DEBUGF(DHCP_DEBUG,("dhcp_option_trailer:dhcp->options_out_len=%"U16_F", DHCP_OPTIONS_LEN=%"U16_F, dhcp->options_out_len, DHCP_OPTIONS_LEN)); */
RodColeman 0:850eacf3e945 1719 LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
RodColeman 0:850eacf3e945 1720 /* add a fill/padding byte */
RodColeman 0:850eacf3e945 1721 dhcp->msg_out->options[dhcp->options_out_len++] = 0;
RodColeman 0:850eacf3e945 1722 }
RodColeman 0:850eacf3e945 1723 }
RodColeman 0:850eacf3e945 1724
RodColeman 0:850eacf3e945 1725 #endif /* LWIP_DHCP */